Abstract: An improved slack adjuster (10) of the clearance sensing type for brakes of the type having a running clearance adjustable by controlled rotation of a shaft (52) such as cam (14) actuated brakes. The slack adjuster includes a one-way drive mechanism including a spring clutch (86) wrapped around the ends of a driving shaft (62) and a driven shaft (52) which is adapted to slip when the torque necessary to rotate the driven shaft exceeds a predetermined limit. The surface (138) of the driven shaft under the spring clutch is provided with a deposit (142) of material different from the remainder of the shaft which will improve the wear and/or frictional characteristics of the surface. The improvement comprises providing a shoulder (148) at the end (146) of the surface of the driven shaft closest the driving shaft which has been found to improve the resistance of the deposit to chip and/or separate from the shaft during assembly and/or use.

Abstract: An anti-wheel lock, system for a vehicle with tandem axles each having a pair of rotatable wheels, the vehicle having a braking system for applying braking forces to such wheels. A brake control device responds to an applied lock signal for controlling the braking system to relieve the braking forces on the wheels. The input circuitry provides for distinct wheel speed signals having values respectively representing the wheel speeds of the four wheels (or wheel sets) carried by the tandem axles. A high wheel gate continuously produces a signal representing the speed of the fastest rotating one of the four wheels by determining the fastest rotating wheel on each pair and then the fastest moving wheel between the pairs. A low wheel gate similarly obtains and continuously provides a signal related to the speed of the slowest moving wheel of the four.

Abstract: A skid control system is provided for use with a vehicle having a pair of spaced apart wheels and having a braking system for applying braking forces to the wheels. A brake control circuit responds to a skid signal obtained from any one of a plurality of incipient detector circuits to act upon the braking system to release the braking forces. A delayed skid signal is provided whenever the difference in wheel speeds of the two wheels exceeds a given amount. A delayed skid signal is also provided if the average wheel speed of the two wheels decreases at a rate greater than a desired decreasing rate. If both wheels decelerate, a skid signal is provided upon sensing that the faster wheel is decelerating at a rate greater than a reference rate. As the wheels spin-up toward an ideal velocity for a braked vehicle, an acceleration detector serves to insure wheel roll up on low friction surfaces. If the wheels spin up at an acceleration greater than an acceleration level, the acceleration detector output is inhibited.

Abstract: An electromagnetic sensor assembly for use with a rotor to sense the velocity of a rotating body and wherein the electromagnetic sensor includes gauge means projecting from the sensor in an amount corresponding to the desired magnetic gap with the gauge means cooperating with the face of the rotor during assembly automatically to adjust the sensor to a final assembled position which establishes the precise gap irrespective of dimensional variations which may be present.

Abstract: A skid control system is provided for use with a vehicle having a pair of spaced apart wheels and having a braking system for applying braking forces to the wheels. A brake control circuit responds to a skid signal obtained from any one of a plurality of incipient detector circuits to act upon the braking system to release the braking forces. A delayed skid signal is provided whenever the difference in wheel speeds of the two wheels exceeds a given amount. A delayed skid signal is also provided if the average wheel speed of the two wheels decreases at a rate greater than a desired decreasing rate. If both wheels decelerate, a skid signal is provided upon sensing that the faster wheel is decelerating at a rate greater than a reference rate. As the wheels spin-up toward an ideal velocity for a braked vehicle, an acceleration detector serves to insure wheel roll up on low friction surfaces. If the wheels spin up at an acceleration greater than an acceleration level, the acceleration detector output is inhibited.

Abstract: A skid control system is provided for use with a vehicle having a pair of spaced apart wheels and having a braking system for applying braking forces to the wheels. A brake control circuit responds to a skid signal obtained from any one of a plurality of incipient detector circuits to act upon the braking system to release the braking forces. A delayed skid signal is provided whenever the difference in wheel speeds of the two wheels exceeds a given amount. A delayed skid signal is also provided if the average wheel speed of the two wheels decreases at a rate greater than a desired decreasing rate. If both wheels decelerate, a skid signal is provided upon sensing that the faster wheel is decelerating at a rate greater than a reference rate. As the wheels spin-up toward an ideal velocity for a braked vehicle, an acceleration detector serves to insure wheel roll up on low friction surfaces. If the wheels spin up at an acceleration greater than an acceleration level, the acceleration detector output is inhibited.