The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 1991
Filed:
Aug. 25, 1989
Michael F Matouka, Utica, MI (US);
Robert J Hammersmith, Rochester Hills, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A pressure actuator for a vehicle braking system is provided. The actuator has a frame with fluid connections with a pressurized fluid source and a wheel cylinder. A piston is slidably mounted inside an interior bore of the frame. A nut is associated with the piston for moving the piston. A drive screw is threadably engaged with the nut. A motor is provided for powering the drive screw in response to a signal given by a controller. A gear train is provided having at least one gear connected with the first drive screw and another gear being connected with the motor for transmitting torque from the motor to the first drive screw. One of the gears has an inner hub and an outer ring with a spring device preventing relative motion between the hub and the ring unless a predetermined torque value is exceeded whereby the hub has angular rotation with respect to the ring.