Patents-Review.com
ClassID:

242187 ⎘

Y10S464/906 - CPC Classification

Classification description:

Rotary shafts, gudgeons, housings, and flexible couplings for rotary shafts; Homokinetic coupling Torque transmitted via radially spaced balls

Recent Application in this class:
#1
20260146653
2026-05-28

CONSTANT VELOCITY JOINT AND DRIVESHAFT INCLUDING SAME

 #2
20260036176
2026-02-05

METHOD OF CARBURIZING DRIVELINE COMPONENTS

 #3
20250237271
2025-07-24

CONSTANT VELOCITY JOINT AND DRIVESHAFT INCLUDING SAME

 #4
20250237270
2025-07-24

CONSTANT VELOCITY JOINT AND DRIVESHAFT INCLUDING SAME

 #5
20250163971
2025-05-22

PLUNGING-TYPE CONSTANT VELOCITY UNIVERSAL JOINT

 #6
20250128544
2025-04-24

AXIAL PLUNGING HALF-SHAFT ASSEMBLY

 #7
20240384762
2024-11-21

PROPELLER SHAFT AND BOOT PROTECTION MEMBER OF PROPELLER SHAFT

 #8
20240247688
2024-07-25

RUBBER OUTBOARD DEFLECTOR RING

 #9
20240209901
2024-06-27

SEALED CONSTANT VELOCITY JOINT

 #10
20240060539
2024-02-22

CONSTANT VELOCITY UNIVERSAL JOINT AND MANUFACTURING METHOD OF CONSTANT VELOCITY UNIVERSAL JOINT

 #11
20240052893
2024-02-15

Plunging type constant velocity universal joint for propeller shaft

 #12
20240035520
2024-02-01

COUNTER TRACK JOINT

 #13
20230400066
2023-12-14

Constant velocity joint for vehicle

 #14
20230331041
2023-10-19

Axial plunging half-shaft assembly

 #15
20230323921
2023-10-12

CONSTANT VELOCITY JOINT

 #16
20230313840
2023-10-05

TAPERED MINOR DIAMETER SPLINE TO INCREASE STRENGTH AND FATIGUE LIFE

 #17
20230184297
2023-06-15

CONSTANT-SPEED UNIVERSAL JOINT

 #18
20230111825
2023-04-13

DRIVE AXLE ASSEMBLY

 #19
20230109000
2023-04-06

Center shaft vented CVJ

 #20
20230043113
2023-02-09

FIXED-TYPE CONSTANT VELOCITY UNIVERSAL JOINT

 #21
20230039622
2023-02-09

CONSTANT VELOCITY JOINT

 #22
20220410624
2022-12-29

Hub built-in type drive axle

 #23
20220258530
2022-08-18

Hub-integrated-type constant-velocity joint device

 #24
20220213932
2022-07-07

Joint assembly with restriction feature

 #25
20220178403
2022-06-09

Rubber outboard deflector ring

 #26
20220170513
2022-06-02

Constant velocity joint

 #27
20220154776
2022-05-19

Dual plunging constant velocity drive shaft

 #28
20220144081
2022-05-12

Propeller shaft

 #29
20220128098
2022-04-28

Fixed type constant velocity universal joint

 #30
20220120320
2022-04-21

Constant velocity joint

 #31
20220065306
2022-03-03

High angle constant velocity joint

 #32
20220056960
2022-02-24

Fixed type constant velocity universal joint

 #33
20220049744
2022-02-17

Constant velocity joint for vehicle

 #34
20220034371
2022-02-03

Constant velocity joint protector

 #35
20220010845
2022-01-13

Protective bellows and transmission joint provided with such a bellows

 #36
20220010844
2022-01-13

Co-molded CVJ boot skirt for anti-slip performance

 #37
20210388872
2021-12-16

Outer part for homokinetic joints and rolling bearings

 #38
20210372485
2021-12-02

METHOD OF CARBURIZING DRIVELINE COMPONENTS

 #39
20210370716
2021-12-02

Constant velocity joint for vehicle

 #40
20210364060
2021-11-25

Apparatus and method for correcting an imbalance in a shaft

 #41
20210362544
2021-11-25

Hub built-in type constant velocity apparatus

 #42
20210341022
2021-11-04

Constant velocity joint with crash collapse feature

 #43
20210285501
2021-09-16

Coupling assembly having angled fastener holes

 #44
20210270325
2021-09-02

Constant velocity joint

 #45
20210199160
2021-07-01

Constant-velocity universal joint

 #46
20210172481
2021-06-10

Plunging type constant velocity universal joint for propeller shaft

 #47
20210140488
2021-05-13

Constant velocity joint

 #48
20210131501
2021-05-06

Constant velocity joint assembly and method thereof

 #49
20210108683
2021-04-15

Constant velocity joint assembly

 #50
20210102581
2021-04-08

Joint assembly having a piloting cover for centering a mating flange relative to an outer race of a constant velocity joint

 #51
20210088083
2021-03-25

Constant-velocity joint

 #52
20210033152
2021-02-04

Fixed type constant velocity universal joint

 #53
20210001667
2021-01-07

Axial plunging half-shaft assembly

 #54
20200370603
2020-11-26

Power transmission shaft

 #55
20200284301
2020-09-10

Constant velocity universal joint

 #56
20200271168
2020-08-27

Constant velocity universal joint

 #57
20200248750
2020-08-06

Constant velocity housing lock system

 #58
20200240477
2020-07-30

Rear-wheel drive shaft

 #59
20200240476
2020-07-30

Plunging type constant velocity universal joint for rear-wheel drive shaft

 #60
20200232514
2020-07-23

Constant-velocity universal joint

 #61
20200182305
2020-06-11

Vehicle driveline joint including a vent and seal assembly

 #62
20200149593
2020-05-14

Constant-velocity universal joint

 #63
20200116205
2020-04-16

Constant-velocity slip ball joint

 #64
20200116204
2020-04-16

Dual plunging constant velocity drive shaft

 #65
20200063802
2020-02-27

Plunging type constant velocity universal joint

 #66
20200055392
2020-02-20

Center bearing assembly including a rotatable weld collar with a tuned damper

 #67
20200018357
2020-01-16

Fixed-type constant velocity universal joint

 #68
20200018356
2020-01-16

Fixed type constant velocity universal joint for rear-wheel drive shaft

 #69
20200003263
2020-01-02

Seal and vent assembly for a vehicle driveline

 #70
20200003262
2020-01-02

Slidable constant speed universal joint

 #71
20200001708
2020-01-02

Center bearing assembly including a rotatable weld collar with a tuned damper

 #72
20190383330
2019-12-19

Constant velocity joint with asymmetric opposed tracks

 #73
20190331172
2019-10-31

Boot assembly for a joint member

 #74
20190309801
2019-10-10

Constant velocity joint

 #75
20190309800
2019-10-10

Constant velocity joint

 #76
20190226528
2019-07-25

Producing a cage for a constant-velocity ball joint

 #77
20190178298
2019-06-13

Boot assembly for a constant velocity joint

 #78
20190178297
2019-06-13

Semi-cylindrical/semi-spherical inner surface of an outer race and a ball cage for a fixed constant velocity joint

 #79
20190145466
2019-05-16

Joint arrangement

 #80
20190101168
2019-04-04

Sliding-type constant velocity universal joint and method for manufacturing same

 #81
20190101167
2019-04-04

Fixed type constant velocity universal joint

 #82
20190101166
2019-04-04

Boot and retention member assembly for a constant velocity joint

 #83
20190085907
2019-03-21

Propeller shaft assembly

 #84
20190040916
2019-02-07

Direct pinion mount constant velocity joint

 #85
20190024723
2019-01-24

Stationary constant-velocity universal joint

 #86
20180363712
2018-12-20

Ball cage for cross-groove type plunging and fixed constant velocity joints

 #87
20180363711
2018-12-20

Wheel drive unit for vehicle

 #88
20180347638
2018-12-06

Air vent system for constant velocity joints

 #89
20180347636
2018-12-06

Fixed constant velocity universal joint

 #90
20180313406
2018-11-01

Fixed constant velocity universal joint

 #91
20180304678
2018-10-25

Fixed constant velocity universal joint, and bearing device for wheels

 #92
20180283463
2018-10-04

Dual rate torsional stiffness drive shaft assembly

 #93
20180266492
2018-09-20

Constant velocity universal joint

 #94
20180209485
2018-07-26

Dust boot for transmission joint and corresponding transmission assembly

 #95
20180180101
2018-06-28

Outer joint member of a constant velocity universal joint

 #96
20180135705
2018-05-17

Variable stiffness joint assembly having a bushing assembly

 #97
20180119745
2018-05-03

Constant velocity joint

 #98
20180100571
2018-04-12

Forged composite inner race for a CVJ

 #99
20180066714
2018-03-08

Sealing system for constant-velocity joint

 #100
20180045250
2018-02-15

Driveshaft with vented CV joint

 #101
20170350455
2017-12-07

Constant velocity joint and method of manufacturing the same

 #102
20170343050
2017-11-30

Ball-type constant velocity joint

 #103
20170321759
2017-11-09

Constant-velocity joint

 #104
20170321757
2017-11-09

Drivetrain component connecting system

 #105
20170248169
2017-08-31

Dual plunging constant velocity drive shaft

 #106
20170241483
2017-08-24

Longitudinal shaft arrangement for a motor vehicle

 #107
20170241482
2017-08-24

Propeller shaft and propeller shaft production method

 #108
20170219015
2017-08-03

Constant velocity joint and manufacturing method therefor

 #109
20170175820
2017-06-22

Constant velocity universal joint

 #110
20170159719
2017-06-08

Constant velocity universal joint outer joint member and manufacturing method for same

 #111
20170138406
2017-05-18

Constant velocity universal joint outer joint member and manufacturing method for same

 #112
20170096231
2017-04-06

Propulsion unit for an aircraft

 #113
20170082152
2017-03-23

Universal joint for downhole motor drive

 #114
20170074328
2017-03-16

Multi-rate torsional bar

 #115
20170058960
2017-03-02

Joint member with extension travel restriction feature

 #116
20170030415
2017-02-02

Constant velocity joint assembly

 #117
20170023069
2017-01-26

Fixed constant velocity universal joint

 #118
20170016484
2017-01-19

Propeller shaft and constant-velocity joint used in said propeller shaft

 #119
20160319882
2016-11-03

Vehicle joint

 #120
20160298694
2016-10-13

Grease retention assembly for a joint of a vehicle drive shaft

 #121
20160290409
2016-10-06

Constant velocity joint

 #122
20160281790
2016-09-29

Fixed type constant velocity universal joint

 #123
20160252137
2016-09-01

Fixed type constant velocity universal joint

 #124
20160238084
2016-08-18

Vehicle transfer case with variable angle joint

 #125
20160223027
2016-08-04

Constant-velocity universal joint

 #126
20160201732
2016-07-14

Sliding ball type constant velocity joint for vehicles

 #127
20160201730
2016-07-14

Method of manufacturing outer joint member of constant velocity universal joint, and outer joint member

 #128
20160195140
2016-07-07

Fixed ball type joint for vehicle

 #129
20160169294
2016-06-16

Universal joint with protective shield

 #130
20160146263
2016-05-26

Universal joint with protective shield

 #131
20160146260
2016-05-26

Fixed-type constant velocity universal joint

 #132
20160053817
2016-02-25

Constant velocity joint in the form of a counter track joint

 #133
20160039516
2016-02-11

Joint arrangement, drive system for driving control surfaces of an aircraft and aircraft with such a drive system

 #134
20150316108
2015-11-05

Fixed type constant velocity universal joint

 #135
20150275980
2015-10-01

Fixed type constant-velocity universal joint

 #136
20150240878
2015-08-27

Fixed type constant velocity universal joint

 #137
20150184698
2015-07-02

Method for producing a connecting element for transmitting rotational movements

 #138
20150159702
2015-06-11

Constant velocity joint torsional damper

 #139
20150096825
2015-04-09

Constant velocity drive assembly

 #140
20140349771
2014-11-27

Direct pinion mount Rzeppa joint

 #141
20140329608
2014-11-06

Fixed type constant velocity universal joint

 #142
20140206464
2014-07-24

Propeller shaft assembly with grease retention and vent cap

 #143
20140038733
2014-02-06

Fixed type constant velocity universal joint

 #144
20130316838
2013-11-28

Counter track joint with axial displacement range

 #145
20130310186
2013-11-21

Sliding ball type constant velocity joint for vehicle

 #146
20130310185
2013-11-21

Sliding ball type constant velocity joint for vehicle

 #147
20130303292
2013-11-14

Sliding ball type constant velocity joint for vehicle

 #148
20130288810
2013-10-31

Universal joint for a downhole drilling motor

 #149
20130267332
2013-10-10

Fixed-type constant-velocity universal joint

 #150
20130252748
2013-09-26

Propeller shaft and constant velocity universal joint used therein

 #151
20130252746
2013-09-26

Propeller shaft and constant velocity universal joint used therein

 #152
20130252743
2013-09-26

Sealing element for a constant velocity joint and constant velocity joint assembly

 #153
20130244798
2013-09-19

Shaft assembly for a constant velocity joint

 #154
20130123395
2013-05-16

Asphalt compositions modified by styrenic block copolymer and vegetable wax

 #155
20130123027
2013-05-16

Ball type constant velocity joint for vehicle

 #156
20130116056
2013-05-09

Angled offset ball type constant velocity joint for vehicle

 #157
20130102397
2013-04-25

Fixed-type constant velocity universal joint

 #158
20130029772
2013-01-31

Inner seal for CV joint boot

 #159
20120309546
2012-12-06

Sliding ball type constant velocity joint for vehicle

 #160
20120297911
2012-11-29

Forged composite powder metal part and method of making same

 #161
20120202605
2012-08-09

Constant velocity joint torsional damper

 #162
20120165105
2012-06-28

Fixed type constant velocity universal joint

 #163
20110300952
2011-12-08

Drive joint and drive shaft

 #164
20110092300
2011-04-21

Method for producing a torque transmission device useful as a fixed constant velocity ball joint for drive shafts

 #165
20110081166
2011-04-07

Constant-velocity joint and image-forming device

 #166
20110077091
2011-03-31

Shock absorbing propeller shaft apparatus for motor vehicle

 #167
20110070956
2011-03-24

Plunging constant velocity universal joint

 #168
20110059802
2011-03-10

Constant velocity joint

 #169
20110053696
2011-03-03

Joint assembly, a wheel bearing apparatus, and the assemblies included in an axle module

 #170
20110039627
2011-02-17

Connecting arrangement between a shaft journal and a joint part

 #171
20110009200
2011-01-13

Longitudinal drive shaft for motor vehicles

 #172
20110003645
2011-01-06

Constant velocity universal joint

 #173
20100323802
2010-12-23

Joint arrangement with cage offset

 #174
20100311508
2010-12-09

Drive shaft and constant velocity joint for it

 #175
20100292016
2010-11-18

Plunging cross-track constant velocity joint

 #176
20100285891
2010-11-11

Direct torque flow constant velocity joint face spline connector

 #177
20100275429
2010-11-04

Method for producing an internal or external part of an opposed track joint

 #178
20100254754
2010-10-07

Retaining ring for a constant velocity joint and method of assembly using the same

 #179
20100242564
2010-09-30

Quenched and tempered joint cage

 #180
20100234112
2010-09-16

Universal joint and method for production thereof

 #181
20100227699
2010-09-09

Variable volume boot

 #182
20100219590
2010-09-02

Boot mounting structure for constant-speed universal joint, and silicone boot for the constant-speed universal joint

 #183
20100216558
2010-08-26

Fixed type constant velocity joint

 #184
20100190558
2010-07-29

Fixed type constant velocity joint

 #185
20100173714
2010-07-08

Fixed constant velocity universal joint and method for manufacturing outer race thereof

 #186
20100164186
2010-07-01

Inner seal for CV joint boot

 #187
20100151950
2010-06-17

Rolling element shaft assembly

 #188
20100130292
2010-05-27

Multi-part longitudinal shaft for motor vehicles

 #189
20100120546
2010-05-13

Boot for constant-velocity universal joint and cross-grooved constant-velocity universal joint

 #190
20100120542
2010-05-13

Shuttle vent valve

 #191
20100105488
2010-04-29

Constant velocity joint grease cap with increased torsional compliance

 #192
20100099504
2010-04-22

Fixed-type constant velocity universal joint

 #193
20100087261
2010-04-08

Fixed type constant velocity universal joint

 #194
20100081511
2010-04-01

Longitudinal shaft assembly for a motor vehicle

 #195
20100069165
2010-03-18

Opposed path joint

 #196
20100064498
2010-03-18

Inner joint part for a constant velocity universal joint and process of producing same

 #197
20100035696
2010-02-11

Driveshaft comprising a counter track joint featuring a delimited axial displacement path

 #198
20100029396
2010-02-04

Fixed constant-velocity universal joint

 #199
20100029395
2010-02-04

Counter track joint for large articulation angles

 #200
20100016088
2010-01-21

Formed grease cover retention feature

 #201
20100016086
2010-01-21

Constant velocity universal joint

 #202
20090305795
2009-12-10

Longitudinal shaft

 #203
20090298599
2009-12-03

Dual type constant velocity universal joint

 #204
20090298598
2009-12-03

Optimized constant-velocity fixed joint with ball tracks free from undercuts

 #205
20090289419
2009-11-26

Boot for a constant velocity joint

 #206
20090270187
2009-10-29

Power transmission spline

 #207
20090270186
2009-10-29

Constant velocity joint

 #208
20090264208
2009-10-22

Fixed constant-velocity universal joint

 #209
20090258716
2009-10-15

Fixed constant velocity universal joint

 #210
20090239669
2009-09-24

Joint assembly and a total assembly of bearing apparatus for a driving wheel

 #211
20090236806
2009-09-24

Sealing element and sealing assembly for homokinetic joints

 #212
20090230759
2009-09-17

Wheel hub/universal joint assembly with end teeth and wheel bearing

 #213
20090209355
2009-08-20

Connecting assembly between a shaft journal and a constant velocity joint

 #214
20090209354
2009-08-20

Connecting assembly between a shaft journal and a constant velocity universal joint

 #215
20090208276
2009-08-20

Connecting arrangement between a shaft journal and a joint part

 #216
20090206649
2009-08-20

Wheel hub-joint unit

 #217
20090186706
2009-07-23

Constant velocity joint with torque overload protection

 #218
20090176587
2009-07-09

Propshaft with constant velocity joint attachment

 #219
20090176586
2009-07-09

Torque Transmission Device Useful as a Fixed Constant Velocity Ball Joint Constructed as an Opposed Track Joint and Method for Producing Such a Joint

 #220
20090176585
2009-07-09

Torque transmission device useful as a fixed constant velocity ball joint for drive shafts and method for producing such a joint

 #221
20090162134
2009-06-25

Constant velocity universal joint

 #222
20090143152
2009-06-04

Method of assembling a constant velocity joint

 #223
20090137326
2009-05-28

Constant velocity joint

 #224
20090136287
2009-05-28

Slide-type constant velocity universal joint

 #225
20090115142
2009-05-07

Self-repairing boot for a constant velocity joint

 #226
20090074342
2009-03-19

Wheel bearing device

 #227
20090069101
2009-03-12

Cross groove constant velocity universal joint

 #228
20090069100
2009-03-12

Joint assembly, a wheel bearing apparatus, and the assemblies included in an axle module

 #229
20090062022
2009-03-05

Constant velocity fixed joint

 #230
20090060406
2009-03-05

Quenched and tempered joint cage

 #231
20090054166
2009-02-26

Fixed constant-velocity universal joint

 #232
20090054165
2009-02-26

Constant velocity universal joint and inner member of the same

 #233
20090048030
2009-02-19

Sliding type constant velocity universal joint

 #234
20090017922
2009-01-15

Fixed-center constant velocity joint

 #235
20080305878
2008-12-11

Constant velocity joint

 #236
20080293500
2008-11-27

Direct torque flow constant velocity joint having collet connection

 #237
20080285902
2008-11-20

Bearing device for drive wheel

 #238
20080261707
2008-10-23

Joint arrangement

 #239
20080254905
2008-10-16

Reinforced rolling boot

 #240
20080254903
2008-10-16

Opposed path joint

 #241
20080248886
2008-10-09

Joint shaft and roller displacement UNIT THEREFOR

 #242
20080248885
2008-10-09

Constant velocity ball joint

 #243
20080248884
2008-10-09

Constant velocity universal joint

 #244
20080242433
2008-10-02

Wheel hub/joint unit

 #245
20080242432
2008-10-02

Displacement unit and joint shaft including such a displacement unit

 #246
20080238184
2008-10-02

Outer joint part of a constant velocity universal joint for a wheel hub-joint-unit

 #247
20080214317
2008-09-04

Driveshaft comprising a counter track joint featuring a delimited axial displacement path

 #248
20080194344
2008-08-14

Homokinetic joint having a sealing arrangement

 #249
20080188317
2008-08-07

Direct torque flow connection with optimized ratios in attachment methods

 #250
20080167134
2008-07-10

Drive shaft and constant velocity joint for it

 #251
20080161119
2008-07-03

Shaft mounting structure of constant velocity joint

 #252
20080161118
2008-07-03

Constant-velocity fixed joint

 #253
20080153607
2008-06-26

Longitudinal drive shaft for motor vehicles

 #254
20080146355
2008-06-19

Sealing assembly

 #255
20080146354
2008-06-19

Plunging constant velocity universal joint

 #256
20080132342
2008-06-05

Propshaft with constant velocity joint attachment

 #257
20080104844
2008-05-08

Method for producing a joint connection and joint connection

 #258
20080096678
2008-04-24

Fixed type constant velocity joint

 #259
20080090665
2008-04-17

Member with inner teeth and method of producing the same

 #260
20080085776
2008-04-10

Homokinetic displacement joint

 #261
20080081704
2008-04-03

Cross groove type constant velocity joint

 #262
20080053735
2008-03-06

Counter track joint with building space

 #263
20080051204
2008-02-28

Protected connection interface for direct torque flow constant velocity joint and method thereof

 #264
20080051203
2008-02-28

Fixed type constant velocity joint

 #265
20070280778
2007-12-06

Fixed type constant velocity universal joint

 #266
20070275784
2007-11-29

Twin-ball joint

 #267
20070249423
2007-10-25

Connecting assembly between a shaft journal and a constant velocity universal joint

 #268
20070248403
2007-10-25

Method and device for producing a link on a drive-shaft of a motor vehicle

 #269
20070238535
2007-10-11

Torque transfer device having a constant velocity joint output

 #270
20070219003
2007-09-20

Wheel bearing device

 #271
20070202958
2007-08-30

Constant velocity joint

 #272
20070191122
2007-08-16

Grease shield sealing system for direct torque flow constant velocity joint

 #273
20070191121
2007-08-16

Sealed joint assembly

 #274
20070161428
2007-07-12

Constant velocity joint

 #275
20070149298
2007-06-28

Direct torque flow constant velocity joint having a non-rotating boot

 #276
20070123358
2007-05-31

Constant velocity joint with rolling radial boot

 #277
20070123356
2007-05-31

Telescopic drive joint

 #278
20070117639
2007-05-24

Constant velocity joint-wheel hub assembly with a hollow connection

 #279
20070111807
2007-05-17

Counter track joint with a ball cage

 #280
20070111806
2007-05-17

Counter track joint with track turning point

 #281
20070093304
2007-04-26

Drive assembly with an intermediate bearing

 #282
20070093303
2007-04-26

Rigid joint sealing system

 #283
20070072687
2007-03-29

Inner joint part for a constant velocity universal joint and process of producing same

 #284
20070066407
2007-03-22

Double constant velocity universal joint

 #285
20070060399
2007-03-15

Ball cage for a constant velocity universal joint and process of producing same

 #286
20070060398
2007-03-15

Fixed ball joint with turned track cross-sections

 #287
20070049382
2007-03-01

Shaft for constant velocity universal joint

 #288
20070037626
2007-02-15

Constant velocity universal joint and inner member thereof

 #289
20060281565
2006-12-14

Counter track joint for large articulation angles

 #290
20060258501
2006-11-16

Torque transfer device having a constant velocity joint output

 #291
20060258466
2006-11-16

Propeller shaft

 #292
20060240897
2006-10-26

High performance constant velocity universal joint

 #293
20060229154
2006-10-12

Power transmission apparatus, differential gear, power distribution apparatus, and hub apparatus

 #294
20060223643
2006-10-05

Exterior joint part comprising a supporting disc

 #295
20060223641
2006-10-05

Vehicle steering device

 #296
20060217208
2006-09-28

Propshaft with constant velocity joint attachment

 #297
20060217207
2006-09-28

Fixed-type constant-velocity universal joint

 #298
20060211505
2006-09-21

Structure for preventing shaft of constant velocity joint from coming off

 #299
20060211503
2006-09-21

Fixed constant velocity universal joint

 #300
20060205522
2006-09-14

Constant velocity universal joint