In the last couple of articles, we used terminology relating to pressure control solenoids such as PWM, Frequency, and Duty Cycle. In this article I thought I would go into depth on what these terms really mean and how they relate to. Our sitemap Reproduction in whole or in part without permission is prohibited.
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Jun 19, Technical Transmission General Articles. The Viscous Coupling VC is the transmission component intended for transmission and leveling of torque from the center drive shaft to the front differential, and on to the front wheels. In contrast to the hydraulic coupling and torque converter, the VC uses a different operating principle: torque is transmitted not through dynamic properties of fluid flow, but thanks to viscous properties of the fluid, which fills the internal space of the viscous coupling unit.
This unit is used as a mechanism for automatic locking of the differential. Design and operating principle The VC unit consists of numerous flat discs installed inside a sealed housing. Design of Viscous Coupling At constant motion of the driving and driven shafts, the VC discs rotate at the same speed and fluid particles do not intermix, having no impact on the disc package. Viscous coupling dismantling Application of Viscous Coupling The viscous coupling is mainly applied in all-wheel drive transmissions of passenger cars, where the VC is used either as a limited slip differential LSD , or plays the role of the locking clutch in addition to the usual differential.
Operation scheme of viscous coupling unit When the VC is used to ensure differential rotation of axles, it should be understood that the VC is by no means a differential: it neither divides the torque, nor splits the power flows.
Useful info about AWD cars When the VC is used for locking of the differential, it connects two components of the differential — either the differential housing carrier and one sun gear, or two sun gears both options are identical in their capacities.
Problems and repair The list of the VC failure symptoms includes: faulty behavior on the road, vibrations and squealing of tires when making a turn, wear of the rear tire. Latest articles. Using the Right Frequency in Transmission Solenoids. Feb 15, go4trans.
The 40 housing plates are engaged with the splines in the housing and the 39 hub plates are splined to the shaft. The plates have holes in them to aid in heat dissipation. Whenever there is any difference in the speed of rotation between the No. This friction is caused by the resistance of the plates sliding against the silicon oil. This resistance between the plates and the silicon oil is what begins to transmit torque from the housing plates to the hub plates and eventually to the rear wheels.
This transmission of torque is proportionate to the difference in the speed of rotation of the wheels. As the difference in propeller shaft speed continues, the temperature of the silicon oil keeps rising. Due to thermal expansion, the pressure inside the viscous coupling unit is also increasing as the temperature rises. When the pressure becomes high enough, the housing plates begin to contact the hub plates and the engine torque to the rear wheels increases rapidly, as noted in the diagram below.
To reduce plate wear, there are spacer rings to limit plate to plate contact. Viscous Coupling Stall Test 1. Raise the car off the ground and place safety stands under the side sill reinforcement sections. Start the engine. Keep the engine speed at idle. Shift into low gear and gradually release the clutch 5. Apply the parking brake firmly. Viscous coupling is OK if the engine stalls Viscous coupling is faulty if the engine continues running.
Differential FAQ What are differentials used for? The differential is a device that splits the engine torque two ways, allowing each output to spin at a different speed. What does the differential do? The differential has three jobs: to aim the engine power at the wheels; to act as the final gear reduction in the vehicle, slowing the rotational speed of the transmission one final time before it hits the wheels; and to transmit the power to the wheels while allowing them to rotate at different speeds.
Do all cars have differentials? The differential is found on all modern cars and trucks, and also in many all-wheel-drive full-time four-wheel-drive vehicles. How much does it cost to replace a differential? Why is it called a differential? It's called differential because of how it transmits the power to the wheels while allowing them to rotate at different speeds.
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