Vehicle differential control

• US 4,162,712 A
• Filed: 03/27/1978
• Issued: 07/31/1979
• Est. Priority Date: 03/27/1978
• Status: Expired due to Term

• Current Assignee: Case Corporation (CNH Industrial N.V.)
• Original Assignee: JI Case Company (CNH Industrial N.V.)
• Inventors: Nelson, Carl D.
• Primary Examiner(s): Silverstrim, John P.
• Application Number:
  US05/890,326
• Time in Patent Office: 491 Days
• Field of Search: 180/43 R, 180/76, 180/82 D, 74/711
• US Class Current: 180/253
• CPC Class Codes: B60K 17/30 the ultimate propulsive elements, e.g. ground wheels, being steerable
• CPC Class Codes: B60K 23/04 for differential gearing

Abstract

A vehicle differential control wherein the two axles and wheels thereon are influential in controlling the differential. Thus, speed sensors are on the two axles and link mechanisms connect the sensors to a valve unit which controls the flow of fluid to the differential and thus controls the operation of the differential and the subsequent speed of the respective axles. Also, the wheels on the axles are steerable wheels, and there is interconnecting mechanism between the wheels and the differential control mechanism so that when the wheels are steered the control mechanism is actuated to again influence the operation of the differential and thus rotate the respective axles accordingly. As such, there is a steering compensated differential controlled device which is both torque and speed sensed, and there is a wheel steering position compensated device which also influences the operation of the differential. The system is such that it assures traction control of all drive wheels at all times.

Claims

1. In a vehicle drive system having a differential including a fluid actuated lock-up element, two wheel axles drivingly connected with said differential and extending from opposite sides thereof, a ground wheel steerably connected with the extending end of each of said axles, steering mechanism connected with each of said wheels, and a fluid power source, the improvement comprising means for controlling said lock-up element in response to both the relative rotational speeds of said axles and the steering position of said steering mechanism, said controlling means including:

a valve housing movably mounted on said vehicle, a closure means movably mounted in said housing whereby relative movement between said closure means and said housing controls fluid flow between said fluid power source and said lock-up element;

first means for moving one of said housing and said closure means in response to a relative rotation between said axles; and

second means for moving the other of said housing and said closure means in response to movement of said steering mechanism.

2. The vehicle drive system as claimed in claim 1, wherein said second means comprises a longitudinal member for transmitting force along the length thereof, and said first means includes a lever system.

3. The vehicle drive system as claimed in claim 2, wherein said first means includes an axle rotation speed sensor operatively associated with each of said axles for sensing axle speed and transmitting the effect thereof to said lever system.

4. The vehicle drive system as claimed in claim 1, wherein said first means includes an axle rotation speed sensor operatively associated with each of said axles for sensing axle speed.