Abstract: A traction control modulator for an automotive traction control system includes a housing having a longitudinal bore in fluid communication with the system. A drive gear selectively rotates a drive screw. A non-rotative nut is threaded onto the drive screw and mounted in the bore. A piston is attached to the nut and slidably mounted in the bore. A retainer is attached to the piston. A spring biases a poppet assembly away from the piston. The poppet assembly is slidably mounted in the bore and includes a poppet, a seal and a seal retainer. The seal retainer has an annular flange received in a groove on a poppet head and an annular cap fitted over a base of the seal.

Abstract: An assembly for providing socket plate torque restraint for a variable displacement wobble plate compressor includes a non-rotary Rzeppa joint. The joint has an outer race, an inner race, grooves in the races, a plurality of torque receiving balls and a cage for properly maintaining and positioning the balls in the grooves for operation. The joint is connected to an anti-rotational shaft. The shaft is mounted by the drive hub of the compressor to allow for translational axial and relative rotational motion. At least one key is received in a keyway in the anti-rotational shaft and a companion socket in the cylinder block fixed to the compressor housing. The Rzeppa joint provides the ideal kinematic restraint motion of the socket plate; the profile of the grooves on the inner and outer races and the cage having a curvature to effectively maintain the balls situated substantially in a single torque transmitting plane that bisects the joint angle.

Abstract: An assembly for enhancing piston stroke control for a variable displacement wobble plate compressor having basic differential gas pressure control includes a non-rotary shaft mounted to provide translational axial movement in the housing of the compressor. A helical compression spring biases the shaft and non-rotary socket plate in an upstroke direction towards full piston stroke operation. The upstroking force provided by the spring acts to compliment the internal refrigerant gas pressure to provide for improved control and stability for piston stroking. The socket plate is driven to nutate by a journal pivotally mounted on a central drive hub. The control assembly further includes a set of ears with outer flats that mate with inner flats on cooperating flanges of the drive hub. Pivot pins extending perpendicular to the direction of piston travel connect the ears of the journal with the flanges of the drive hub.