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:
Mar. 14, 2000
Filed:
Mar. 30, 1998
Toshihiro Murayama, Higashimatsuyama, JP;
Zexel Corporation, Tokyo, JP;
Abstract
A variable capacity vane compressor includes side members secured to opposite end faces of a cylinder block, respectively, and a rotary plate mounted in one of the side members, for adjusting compression starting timing of the compressor to thereby increase or decrease capacity or delivery quantity of the compressor. Further, the compressor includes a main piston slidably mounted in the one of the side members, for causing rotation of the rotary plate, a pilot piston slidably arranged at one end of the main piston, for inhibiting movement of the main piston in a capacity-decreasing direction, a first low-pressure chamber formed within another end portion of the main piston, into which suction pressure is introduced via a first low-pressure communication passage, a high-pressure chamber defined by a reduced-diameter portion formed on the one end of the main piston and one end face of the pilot piston, into which is introduced control pressure for driving the main piston and the pilot piston, a second low-pressure chamber formed at another end of the pilot piston, into which suction pressure is introduced via a second low-pressure communication passage, a main urging member urging the main piston in the capacity-decreasing direction, and an auxiliary urging member urging the main piston in a capacity-increasing direction. The second low-pressure communication passage has a cross-sectional area which is smaller than a cross-sectional area of the first low-pressure communication passage.