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:
Sep. 26, 1989
Filed:
Sep. 06, 1988
John F Hoying, Bellbrook, OH (US);
Stanley E Smith, Dayton, OH (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A hydraulic mount assembly is disclosed having a partition forming two hydraulic chambers and including a damping decoupler. A primary chamber is formed by an elastomeric member and a secondary chamber by a resilient diaphragm. During dynamic loading of the mount, fluid passes through an orifice between the two chambers of the mount causing expansion and contraction of the diaphragm. An expandable, pneumatic bellows is mounted within the primary chamber. A vent tube provides controlled fluid communication between the bellows and the atmosphere to provide a relatively soft mount for engine isolation. Air entry into the bellows is induced by the built-in spring memory of the bellows causing expansion. Air may be removed or partially removed from the bellows by an external vacuum source, causing a negative pressure and contraction. By controlling bellows expansion and contraction in this manner, the dynamic rate of the mount assembly may be selectively reduced at higher vibration frequencies; that is, those over 20 Hz. An assist spring may be provided in the bellows. Further, by evacuating the bellows, a relatively hard mount with standard operating parameters may be provided; i.e. a mount having relatively high damping and high rate for better control under extreme driving conditions. A control circuit with on-board transducers is provided to monitor vehicle operating and road conditions and modulate the pressure by controlling venting of the bellows and the vacuum in the bellows for maximum operating efficiency.