CAB AND WORK VEHICLE

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National stage application of International Application No. PCT/JP2023/030924, filed on Aug. 28, 2023. This U.S. National stage application claims priority under 35 U.S.C. § 119(a) to Japanese Patent Application No. 2022-167602, filed in Japan on Oct. 19, 2022, the entire contents of which are hereby incorporated herein by reference.

BACKGROUND

Technical Field

The present invention relates to a cab and a work vehicle.

Background Information

Reverse driving is frequently necessary for work vehicles like bulldozers at construction sites, making rear visibility essential. For example, in a cab described in Japanese Patent Publication No. 2021-165489, the rear pillar is positioned forward of the cab's rear end to enhance the rear visibility.

SUMMARY

However, the rear pillar often obstructs rear visibility, necessitating further enhancements.

The present disclosure aims to provide a cab and a work vehicle with improved rear visibility.

The cab according to the first aspect of the present disclosure is a cab of a work vehicle, and includes a seat, a rear pillar, and a rear window. The rear pillar is positioned behind the seat. The rear window protrudes rearward from the rear pillar. The rear pillar includes an angled portion that is disposed inward relative to the vehicle's width direction and angled outward as it extends rearward, as seen in a plan view. The rear window includes a rear lateral window that is inclined inward as it extends rearward from the end of the angled portion, as seen in a plan view. The rear lateral window faces a predetermined position of the seat.

According to the present disclosure, a cab and a work vehicle with improved rear visibility can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating a bulldozer according to an embodiment of the present disclosure.

FIG. 2 is a side view illustrating a cab according to an embodiment of the present disclosure.

FIG. 3 is a cross-sectional view taken along the line CC in FIG. 2.

FIG. 4A is a perspective view illustrating a cab according to an embodiment of the present disclosure as viewed from behind.

FIG. 4B is a view similar to FIG. 4A except that the rear window has been removed.

FIG. 5A is a cross-sectional perspective view illustrating the rear pillar on the right side and the portions around it as viewed from the right rear, and FIG. 5B is a view similar to FIG. 5A except that the rear window has been removed.

FIG. 6A is a cross-sectional perspective view illustrating the rear pillar on the right side and the portions around it as viewed from the right front, and FIG. 6B is a view similar to FIG. 6A except that the rear window has been removed.

FIG. 7A is a perspective view illustrating only the rear pillar 14 in FIG. 5B, and FIG. 7B is an exploded view of the rear pillar.

FIG. 8A is a top view of the rear pillar, and FIG. 8B is a rear view of the rear pillar as viewed from behind.

FIG. 9 is a perspective sectional view of a rear pillar as viewed from inside of a cab according to an embodiment of the present disclosure.

FIG. 10 is a partially enlarged view of FIG. 3 for illustrating an eye point of the operator.

DETAILED DESCRIPTION OF EMBODIMENT(S)

A work vehicle according to an embodiment of the present disclosure will be described with reference to the drawings.

Configuration

(Outline of Bulldozer 1)

FIG. 1 is a perspective view illustrating a bulldozer 1 (an example of a work vehicle) according to the present embodiment. The bulldozer 1 includes a vehicle body 2, a work implement 3, a ripper device 4, and a traveling device 5.

The work implement 3 is positioned in front of the vehicle body 2. The work implement 3 includes a blade 6 for performing work such as digging up soil and sand. The ripper device 4 is positioned at the rear of the vehicle body 2. The ripper device 4 includes a claw portion 7 for crushing rocks and the like.

As illustrated in FIG. 1, the vehicle body 2 includes a vehicle body frame 8 and a cab 9. The traveling device 5 is disposed on the vehicle body frame 8. The traveling device 5 includes a pair of left and right crawlers 5a. FIG. 1 illustrates only the crawler 5a on the left side.

The cab 9 is disposed on the upper side of the vehicle body frame 8. In the present embodiment, the front, rear, left and right directions will be described based on the driver's seat of the cab 9. The direction in which the driver's seat of the cab 9 faces directly ahead is referred to as the front direction A1, while the opposite direction is designated as the rear direction A2. The front-rear direction is represented by the letter A. The left and right sides of the vehicle in the lateral direction when the driver's seat faces directly ahead are indicated by the left direction B1 and the right direction B2, respectively. The left-right direction is also referred to as a vehicle-width direction and is represented by the letter B.

(Cab 9)

FIG. 2 is a side view of the cab 9. FIG. 3 is a cross-sectional view taken along the line CC in FIG. 2. FIG. 4 is a perspective view of the cab 9 as viewed from the right rear. The cab 9 includes a seat 10, a floor part 11, a pair of left and right side panel parts 101, a pair of left and right lateral parts 102, a ceiling part 12, a pair of left and right front pillars 13, a pair of left and right rear pillars 14, a pair of left and right intermediate pillars 15, and a rear face part 103.

As illustrated in FIG. 3, the seat 10 includes a seat surface 21 and a backrest 22. The seat surface 21 is a surface on which an operator sits. The backrest 22 is disposed at the rear of the seat surface 21. In the present embodiment, the seat 10 is configured to be rotatable left and right within a predetermined angle range α° (for example, about 10°) from a state in which the seat 10 faces forward. In FIG. 3, the seat 10 in the state of maximum rotation to the right is shown by a solid line, and the seat 10 facing forward is shown by a two-dot chain line.

The floor part 11 includes a front portion 111 arranged in the portion on the front direction A1 side and a rear portion 112 arranged in the portion on the rear direction A2 side. As illustrated in FIG. 2, the rear portion 112 is arranged higher than the front portion 111, and a step is formed between the front portion 111 and the rear portion 112. As illustrated in FIG. 3, the rear portion 112 has a shorter width in the vehicle-width direction B than the front portion 111.

As illustrated in FIG. 3, a pair of left and right side panel parts 101 are arranged on both sides of the rear portion 112 in the vehicle-width direction B. Each side panel part 101 is arranged along the up-down direction. The side panel part 101 on the right side is arranged upward from the right end of the rear portion 112. The side panel part 101 on the left side is arranged upward from the left end of the rear portion 112.

As illustrated in FIG. 3, a pair of left and right lateral parts 102 is arranged on both sides of the rear portion 112 in the vehicle-width direction B so as to sandwich the rear portion 112 between them. The lateral parts 102 are each arranged parallel to the floor part 11. The lateral parts 102 are each arranged above the rear portion 112. The lateral parts 102 are each arranged from the upper ends of the side panel parts 101 in the outside in the vehicle-width direction B. The lateral part 102 on the right side is arranged from the upper end of the side panel part 101 on the right side toward the right direction B2. The lateral part 102 on the left side is arranged from the upper end of the side panel part 101 on the left side toward the left direction B1. The lateral parts 102 are located laterally of the backrest 22 as illustrated in FIG. 2.

The pair of left and right front pillars 13 is arranged between the front end of the front portion 111 of the floor part 11 and the front end of the ceiling part 12. The front pillar 13 on the left side connects the end of the front end of the front portion 111 in the left direction B1 to the end of the front end of the ceiling part 12 in the left direction B1. The front pillar 13 on the right side connects the end of the front end of the floor part 11 in the right direction B2 to the end of the front end of the ceiling part 12 in the right direction B2.

The pair of left and right rear pillars 14 is arranged between the lateral parts 102 and the ceiling part 12 as illustrated in FIG. 2. The rear pillar 14 on the left side connects the end of the lateral part 102 on the left side in the left direction B1 to the end of the rear end of the ceiling part 12 in the left direction B1. The rear pillar 14 on the right side connects the end of the lateral part 102 on the right side in the right direction B2 to the end of the rear end of the ceiling part 12 in the right direction B2. The rear pillars 14 will be described in detail later.

As illustrated in FIG. 2, the pair of left and right intermediate pillars 15 is arranged between the front portion 111 of the floor part 11 and the ceiling part 12. The pair of intermediate pillars 15 is disposed between the pair of front pillars 13 and the pair of rear pillars 14 in the front-rear direction A. The intermediate pillar 15 on the left side extends upward from the left end of the rear end of the front portion 111 and is connected to the ceiling part 12. The intermediate pillar 15 on the right side extends upward from the right end of the rear end of the front portion 111 and is connected to the ceiling part 12.

The rear face part 103 is positioned on the rear surface of the cab 9. The rear face part 103 is arranged between the rear end of the floor part 11 and the rear end of the ceiling part 12. The rear face part 103 includes an upper frame part 81, a lower frame part 82, an upper protrusion part 83, and a lower protrusion part 84, as illustrated in FIG. 4A. The upper frame part 81 is plate-shaped and is positioned downward from the rear end of the ceiling part 12. The lower frame part 82 is plate-shaped and is positioned upward from the rear end of the rear portion 112 of the floor part 11. The left and right lateral parts 102 and the lower protrusion part 84 surround the left, right, and rear sides of the seat 10. The upper protrusion part 83 protrudes from the lower end of the upper frame part 81 toward the rear direction A2. The lower protrusion part 84 protrudes from the upper end of the lower frame part 82 toward the rear direction A2. The lower protrusion part 84 and the lateral parts 102 are disposed at the same height and are connected. The upper protrusion part 83 and the lower protrusion part 84 are arranged with a predetermined interval between them. A rear window 19, which will be described later, is mounted between the upper protrusion part 83 and the lower protrusion part 84, allowing for the formation of a bay window.

As illustrated in FIG. 1, the cab 9 further includes a front window 16, a pair of left and right front lateral windows 17, a pair of left and right lateral windows 18, and a rear window 19 (see FIG. 4A). The front window 16 is disposed between the pair of left and right front pillars 13. The pair of left and right front lateral windows 17 are arranged so as to sandwich the front window 16 with them. Each of the front lateral windows 17 is disposed between the front pillar 13 and the intermediate pillar 15. The pair of left and right lateral windows 18 is disposed laterally of the seat 10. Each of the lateral windows 18 is disposed between the intermediate pillar 15 and the rear pillar 14. It should be noted that, as for the front lateral windows 17 and lateral windows 18, the front lateral window 17 and lateral window 18 on the left side are illustrated only in FIG. 1 and are omitted in the other drawings.

As illustrated in FIG. 3, the rear window 19 protrudes from the rear pillars 14 in the rear direction A2. The rear window 19 is arranged across the pair of rear pillars 14.

FIG. 5A is a cross-sectional perspective view of the rear pillar 14 on the right side and the portions around it as viewed from the right rear. FIG. 5B is a view similar to FIG. 5A, except that the rear window 19 has been removed. As illustrated in these figures, the lower end of the rear window 19 is attached to the lower frame 84a that is the rear end of the lower protrusion part 84. The upper end of the rear window 19 is attached to the upper frame 83a that is the rear end of the upper protrusion part 83 illustrated in FIG. 4B.

As illustrated in FIG. 3, FIG. 4A, and FIG. 5A, the rear window 19 includes a rear center window 23 and a pair of rear lateral windows 24. As illustrated in FIG. 3, the rear center window 23 is arranged along the vehicle-width direction B. The rear lateral window 24 on the right side is arranged between the rear center window 23 and the rear pillar 14 on the right side. The rear lateral window 24 on the left side is arranged between the rear center window 23 and the rear pillar 14 on the left side. The rear lateral windows 24 are inclined relative to the vehicle-width direction B. The rear lateral windows 24 are inclined inward relative to the vehicle-width direction B as they extend in the rear direction A2. More specifically, the rear lateral window 24 on the right side is inclined to be positioned leftward as it extends in the rear direction A2. The rear lateral window 24 on the left side is inclined to be positioned rightward as it extends in the rear direction A2. The space between the rear lateral windows 24 and the rear center window 23 is filled with sealant. It should be noted that a component corresponding to a pillar may be positioned between each rear lateral windows 24 and the rear center window 23.

(Rear Pillars 14)

The pair of rear pillars 14 is arranged symmetrically relative to a central axis O (see FIG. 3) along the front-rear direction A at the center of the vehicle-width direction B. The following description focuses on the rear pillar 14 on the right side.

FIG. 6A is a cross-sectional perspective view of the rear pillar 14 on the right side and the portions around it as viewed from the right front. FIG. 6B is a view similar to FIG. 6A except that the rear window has been removed. FIG. 7A is a perspective view illustrating only the rear pillar 14 in FIG. 5B. FIG. 7B is an exploded view of the rear pillar 14. FIG. 8A is a top view of the rear pillar 14. FIG. 8B is a rear view of the rear pillar 14 as viewed from behind.

As illustrated in FIGS. 6A and 6B, the rear pillars 14 are connected to the rear lateral windows 24 of the rear window 19.

As illustrated in FIG. 7A, each rear pillar 14 includes a first reinforcing member 31 (one example of a reinforcing member) and a pillar body member 32. The rear pillar 14 is configured to be tubular with the first reinforcing member 31 and the pillar body member 32. As illustrated in FIG. 6A, the first reinforcing member 31 is arranged along the vehicle-width direction B. As illustrated in FIG. 7B, the first reinforcing member 31 is plate-shaped. The first reinforcing member 31 includes an end face 31a facing outward in the vehicle-width direction B. The end face 31a is arranged parallel to the front-rear direction A. The end face 31a is formed along the up-down direction.

The first reinforcing member 31 includes an upper part 36 and a lower part 33. The upper part 36 has a substantially constant width in the vehicle-width direction B. The lower part 33 is located under the upper part 36. The lower part 33 is a lower part of the first reinforcing member 31 and is a part of the first reinforcing member 31 that is connected to the lateral parts 102. The lower part 33 includes a curved part 34 and a lower end part 35. The curved part 34 increases in length in the vehicle-width direction B as it extends downward from the lower end of the upper part 36. The inner surface of the curved part 34 is convex, curving downward and outward. The lower end part 35 is a part of the lower part 33 under the curved part 34. The lower end part 35 is connected to the lateral parts 102. The lower end part 35 has a constant length in the vehicle-width direction B.

The pillar body member 32 is formed by bending a plate-shaped member as illustrated in FIG. 7B. The pillar body member 32 is arranged on the rear side of the first reinforcing member 31 as illustrated in FIG. 6B. The pillar body member 32 includes an outer part 41 and an inner part 42. The outer part 41 is an outer part of the pillar body member 32 located in the vehicle-width direction B. The outer part 41 follows the outline of the lateral part 102 and the lower protrusion part 84. The rear end of the outer part 41 is connected to the rear end of the inner part 42. The inner part 42 is an inner part of the pillar body member 32 located in the vehicle-width direction B.

The outer part 41 includes an outer front portion 51 (an example of an outer connection portion) and an outer angled portion 52. The outer front portion 51 is arranged along the front-rear direction A. As illustrated in FIG. 8A, the front end 51a of the outer front portion 51 is connected to the end face 31a of the first reinforcing member 31 facing outward. The outer front portion 51 is perpendicular to and connected with the first reinforcing member 31.

The outer angled portion 52 is arranged on the rear side of the outer front portion 51. The outer angled portion 52 is disposed at an angle relative to the front-rear direction A. As illustrated in FIG. 6B, the outer angled portion 52 is angled inward with respect to the vehicle-width direction B as it extends in the rear direction A2. As illustrated in FIG. 5A and FIG. 6B, the outer angled portion 52 is disposed parallel to the rear lateral window 24. As illustrated in FIG. 5A, the outer end 24a of the rear lateral window 24 is attached to the outer surface of the outer angled portion 52.

The inner part 42 includes an inner front portion 53 (an example of an inner connection portion) and an angled portion 54. The inner front portion 53 is arranged along the front-rear direction A as illustrated in FIG. 6B. The front end surface 53a of the inner front portion 53 is perpendicular to and connected with the rear surface 31b of the first reinforcing member 31 as illustrated in FIG. 8A. The angled portion 54 is arranged on the rear side of the inner front portion 53. The angled portion 54 is connected to the inner front portion 53 at its rear end position 54a. The angled portion 54 is angled relative to the front-rear direction A. As illustrated in FIG. 6A and FIG. 6B, the angled portion 54 is angled outward with respect to the vehicle-width direction B as it extends rearward. More specifically, the angled portion 54 on the right side is angled to be positioned on the right direction B2 side in the vehicle-width direction B as it extends in the rear direction A2. The angled portion 54 on the left side is angled to be positioned on the left direction B1 side in vehicle-width direction B as it extends in the rear direction A2. The rear lateral window 24 is arranged to protrude inward in vehicle-width direction B from the rear end position 54a of the angled portions 54. The rear lateral window 24 is inclined inward relative to vehicle-width direction B as it extends rearward from the rear end position 54a of the angled portions 54, as seen in a plan view.

FIG. 9 is a perspective cross-sectional view of one rear pillar 14 as viewed from inside the cab 9. The rear pillar 14 is connected to a second reinforcing member 61 and a third reinforcing member 71. The second reinforcing member 61 is a plate-shaped member and is arranged along the front-rear direction A. The second reinforcing member 61 includes a rear end surface 61a. The rear end surface 61a is arranged parallel to the vehicle-width direction B. The rear end surface 61a is positioned along the up-down direction. The rear end surface 61a is connected to the front surface 31c of the first reinforcing member 31. The second reinforcing member 61 includes a lower portion 63. The lower portion 63 is a lower portion of the second reinforcing member 61 and is a portion of the second reinforcing member 61 that is connected to the lateral part 102. The lower portion 63 includes a curved portion 64 and a lower end portion 65. The curved portion 64 is a portion of the lower portion 63 of a length which increases in the front-rear direction A toward the lateral part 102. The front surface of the curved portion 64 is curved convexly rearward and downward. The lower end portion 65 is a portion under the curved portion 64 of the lower portion 63. The lower end portion 65 is connected to the lateral part 102. The lower end portion 65 has a constant length in the front-rear direction A.

As illustrated in FIG. 9, the third reinforcing member 71 is a plate-shaped member and is arranged parallel to the rear lateral window 24. As illustrated in FIG. 5B, the third reinforcing member 71 includes an outer end surface 71a. The outer end surface 71a is arranged perpendicular to the rear lateral window 24. The outer end surface 71a is positioned along the up-down direction. The outer end surface 71a is connected to the outer surface of the angled portion 54. As illustrated in FIG. 9, the third reinforcing member 71 includes a curved portion 74 and a lower end portion 75. The curved portion 74 is formed so that the length in the front-rear direction A increases toward the lower protrusion part 84. The inner surface of the curved portion 74 is curved convexly downward and outward. The lower end portion 75 is disposed below the curved portion 64 and is connected to the lower protrusion part 84. The lower end portion 75 has a constant length in the direction parallel to the rear lateral windows 24.

(Rear Visibility)

Here, the operator's eye point (one example of a predetermined position) when checking the rear is described. When checking the rear, the operator rotates the seat 10 and moves his/her head. For example, for checking the right rear, the seat 10 is rotated to the right to check the rear as illustrated in FIG. 3. For the check, the operator moves his/her head, and thereby the operator's eye point moves from the center of the seat 10 to the right rear. FIG. 10 is a partially enlarged view of FIG. 3 and illustrates the operator's eye point. FIG. 10 shows the operator's center point P1. The operator's center point P1 is set based on ISO 5353. The line L1 is perpendicular to the central axis D1 of the seat surface 21 in the front-rear direction and passes through the center of the front surface 22a of the backrest 22. The line L2 is parallel to the central axis D1 and passes through the right end of the seat surface 21 when the seat 10 is rotated to the right by an angle α. The intersection of the lines L1 and L2 is the eye point E when the operator checks the right rear. The eye point E in the left direction, as illustrated in FIG. 3, is the intersection point of the line L1 and the line passing through the left end of the seat surface 21 and parallel to the central axis D1 when the seat 10 is rotated leftward by an angle α. It should be noted that the height of the eye point E can be defined as the height range when an operator with a height of about 175 cm is sitting on the seat 10.

The eye point E in the right direction faces the rear lateral window 24 on the right side. Specifically, as illustrated in FIG. 3, the straight line passing through the inner end 24b of the connection portion of the rear lateral window 24 with the rear pillar 14 and perpendicular to the rear lateral window 24 is defined as L3. The end 24b corresponds to the inner end of the outer angled portion 52 of the rear pillar 14. The straight line passing through the inner end 24c of the rear lateral window 24 and perpendicular to the rear lateral window 24 is defined as L4. The rear lateral window 24 facing the eye point E means that the eye point E is located in the region W1 between lines L3 and L4. The lines L3, L4, and the eye point E are at the same height. The angled portion 54 on the right side is located along the line L3. The angled portion 54 on the right side is angled so as not to enter the region W1. In addition, the length of the upper part 36 of the first reinforcing member 31 in the vehicle-width direction B is set so as not to extend into the region W1.

Similarly, the eye point E in the left direction faces the rear lateral window 24 on the left side. Specifically, as illustrated in FIG. 3, the straight line passing through the inner end 24b of the connection portion of the rear lateral window 24 with the rear pillar 14 and perpendicular to the rear lateral window 24 is defined as L5. The straight line passing through the inner end 24c of the rear lateral window 24 and perpendicular to the rear lateral window 24 is defined as L6. The rear lateral window 24 on the left side facing the eye point E means that the eye point E is located in the region W2 between the lines L5 and L6. The lines L5, L6, and the eye point E are at the same height. The angled portion 54 on the left side is located so as to follow the line L5. The angled portion 54 on the left side is angled so as not to enter the region W2. In addition, the length of the upper part 36 of the first reinforcing member 31 in the vehicle-width direction B is also set so as not to extend into the region W2.

(Features and Others)

(1) In the present embodiment, the cab 9 is the cab 9 of the bulldozer 1, and includes the seat 10, the rear pillar 14, and the rear window 19. The rear pillar 14 is positioned behind the seat 10. The rear window 19 protrudes rearward from the rear pillar 14. The rear pillar 14 includes the angled portion 54 that is positioned inside relative to the vehicle-width direction B and is angled outward as it extends rearward, as seen in a plan view. The rear window 19 includes the rear lateral window 24 which is inclined inward as it extends rearward from the rear end position 54a of the angled portion 54, as seen in a plan view. The rear lateral window 24 faces the eye point E of the seat 10.

As described above, the rear window 19 protrudes rearward from the rear pillar 14, the angled portion 54 is included in the rear pillar 14, and the rear lateral window 24 is included on the rear window 19 to face the eye point E. This configuration enhances rearward visibility.

(2) In the cab 9 of the present embodiment, the eye point E is located rearward of and lateral to the operator's center point P1 (an example of a central position) of the seat 10, as seen in a plan view.

When the operator checks the rear, the position of his/her head moves laterally and rearward from the operator's center point P1 in the seat 10. Thus, the eye point E can be set at that position.

(3) In the cab 9 of the present embodiment, the rear pillar 14 further includes the outer part 41, the inner part 42, and the first reinforcing member 31. The outer part 41 is disposed outside the angled portion 54 in the vehicle-width direction B. The inner part 42 includes the angled portion 54, is connected to the outer part 41, and is disposed inside the outer part 41. The first reinforcing member 31 is a plate-shaped member, is connected to the ends of the outer part 41 and the inner part 42, and is disposed along the vehicle-width direction B. The first reinforcing member 31 includes the lower part 33 (an example of a first lower part). The lower part 33 includes the curved part 34 (an example of a part that increases in length) that increases in length in the vehicle-width direction B as it extends downward.

The first reinforcing member 31 is configured to be part of the rear pillar 14. Therefore, the first reinforcing member 31 can be disposed on the outside of the rear pillar rather than on the inside. This makes it possible to ensure strength and improve visibility.

(4) In the cab 9 of the present embodiment, the inner part 42 is positioned along the front-rear direction A in front of the angled portion 54 and further includes the inner front portion 53 that is vertically connected to the first reinforcing member 31. The outer part 41 further includes the outer front portion 51 that is disposed along the front-rear direction A and is vertically connected to the first reinforcing member 31.

As described above, the inner front portion 53 and the outer front portion 51 of the pillar body member 32 disposed vertically relative to the first reinforcing member 31 facilitates their connection through welding or other means.

(5) In the cab 9 of the present embodiment, the rear pillar 14 includes the outer part 41, which are disposed outside the angled portion 54 in the vehicle-width direction B. The outer part 41 includes the outer angled portion 52 which is angled inward as it extends rearward. The outer angled portion 52 is disposed parallel to the rear lateral windows 24. The rear lateral window 24 is connected to the outer angled portion 52.

The above configuration facilitates the secure attachment of the rear lateral window 24, which is disposed diagonally relative to the vehicle-width direction B, to the rear pillar 14.

Other Embodiments

One embodiment of the claimed invention has been described above. However, the claimed invention is not limited to the above embodiment, and various changes can be made without departing from the scope of the claimed invention. In particular, the multiple embodiments and modifications described in this specification can be arbitrarily combined as necessary.

(A) In the above embodiment, to facilitate connection, an inner front portion 53 perpendicular to the first reinforcing member 31 is provided. However, the inner front portion 53 is not essential. For example, the angled portion 54 may extend to be connected to the first reinforcing member 31.

(B) In the above embodiment, the rear pillar 14 connects between the ceiling part 12 and the lateral part 102. However, the claimed invention is not limited to this configuration. For example, when the width of the rear portion 112 of the floor part 11 in the vehicle-width direction B is large, the rear pillar 14 may connect between the ceiling part 12 and the rear portion 112 of the floor part 11.

(C) In the above embodiment, the lower part 33 of the first reinforcing member 31 includes a lower end part 35 whose length is constant in the front-rear direction A. However, the first reinforcing member 31 does not have to include the lower end part 35, and the curved part 34 may be connected to the floor part 11. In the case where the lower part 33 includes a portion whose length increases in the vehicle-width direction B as it extends toward the floor part 11 and further includes another portion, it is sufficient that the another portion is formed to have a constant length in the left-right direction.

(D) In the above embodiment, the pillar body member 32 is described to be formed by bending a plate-shaped member. However, the present invention is not limited to this configuration, and the pillar body member 32 may be formed by joining a plurality of members.

(E) In the above embodiment, the seat 10 is configured to rotate left and right. However, the seat 10 does not have to be rotatable left and right. In that case, the position of the eye point can be obtained as described above.

(F) In the above embodiment, a bulldozer 1 has been given as an example of a work vehicle. However, the claimed invention is not limited to this example and can be applied to any work vehicle equipped with a cab, including a wheel loader, motor grader, shovel loader, wheel loader, dump truck, and the like.

According to the current disclosure, a cab and a work vehicle with improved rear visibility can be provided.