What is a Universal Joint Cross

UJ cross or Universal Joint Cross or Cross is a chassis truck part used alongside with rotating shafts, like drive/ propeller shafts to maintain uniform rotating motion between the two truck parts by coupling the metal rods and allowing the shafts to move flexibly in angular directions like upwards, downwards and sideways. The purpose of a universal joint cross truck part is high torque transmission/ transfer in limited space and time. Here is a simple youtube video to show how UJ cross helps to achieve such torque : 

https://youtu.be/5gOeBE-ylQw?t=142

Below you can see some photos of applications of UJ Cross as truck spare parts for commercial vehicles. UJ cross is used in almost all vehicles – trucks, rotavator, cars, machinery etc.    

 

Here you can see that for connecting two moving shafts, a universal joint cross is used so that appropriate and equivalent rotating motion can be maintained between the rotating parts of a truck. 

Important parts of a Universal Joint Cross:

• Cross/ Spider – This is the main structure of the truck part which is fitted inside the shaft. 
• 4 grease/ grease less Roller Bearing – This is the cover which encompases the other truck parts around and is further attached to the cross/ spider
• Seal – Inside the roller bearing case, are the oil seal & dust cover seal which ensure proper play and gap between the adjacent chassis truck parts
• Needle Roller – Needle type roller helps in maintaining circular movements of the rotating shafts. 
• Thrust Washer – Chillar truck parts such as thrust washer ensures proper distance and play.
• Circlip/ Snap Ring – 4 rings are attached to each roller bearing case to ensure proper attachment to the shaft. 

Source : GMB

TRENDY model number	Vehicle & Size
T776	UJ Cross TATA 1312/1612/1516/1510/2213/2416
T780	Universal Joint Cross JEEP DIESEL [27mmx81mm]
T781	CANTER /MSL TYPE TATA 407 TURBO / JCB SMALL [30mm x 106mm]
T783	UJ CROSS JCB 3DX [35mm x 106mm]
T784	U J CROSS TATA 407 TURBO [30mm x 92 mm]
T787	Universal Joint CROSS TATA 2515 [28 mm x 128 mm]
T791	U.J CROSS TATA 407 OLD MODEL [30 mm x 81 mm]
T794	U.J CROSS 1312/1612/1516/1510/2213/2416 GREASE LESS [46mm x 119 mm]
T827	CROSS LEYLAND BEDFORD [39.5mm x 115mm]
T830	U.J.CROSS 2518(42X120)
T869	U J CROSS HYWA / AMW ( 42X129)
T870	U J CROSS 4018 PATTI TYPE 49.2X170
T871	U J CROSS ACE MAGIC 22X54.5
T872	U J CROSS ACE O/M 24X60
T873	U J CROSS LEYLAND TUSKER 35X127
T874	U J CROSS 4018 LOCK TYPE 48X135
T1006	U J CROSS 3516 TAURAS [ 47.6MM ]
T777	UJ cross Rotavator small 38 mm x 102 mm
T778	Cross Rotavator
T823	UJ CROSS rotavator small GREASE LESS 38X102
T3153	UJ Cross ROTAVATOR WITH 4 NIPPLES

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