Kabushiki Kaisha Toyota Jidoshokki

Kabushiki Kaisha Toyoda Jidoshokki Seisakusho

Mitsuyo Ishikawa

Jun Kondo

Tomohiro Wakita

Takeshi Aoki

Shinichi Sato

Masahiro Kawaguchi

Noriyuki Shintoku

Toshiyuki Kobayashi

Kazushige Murao

Akio Saiki

Hirofumi Sato

Shinsuke Asou

Shoji Takemoto

Masashi Oda

Toshiyuki Banno

A double-headed piston type swash plate compressor is provided with a front housing including a suction chamber, a rear housing, a cylinder block, a rotation shaft, and double-headed pistons. The cylinder block includes cylinder bores, a rotation shaft accommodation bore, a communication conduit that communicates the suction chamber with the rotation shaft accommodation bore, and suction passages communicating the rotation shaft accommodation bore to front compression chambers. The rotation shaft includes a groove passage that communicates with the suction passages. Further, the rotation shaft includes an annular groove that communicates the communication conduit with the groove passage. The annular groove includes a front side surface, which is spaced toward the rear housing from an opening of the rotary shaft accommodation bore that faces the front housing.

Double-headed piston type swash plate compressor

A swash plate includes a boss, which is mounted on the drive shaft, and a plate portion, which extends from the boss to be inclined with respect to the drive shaft. A rotary valve includes a suction passage, which sequentially connects cylinder bores in a suction stroke via an associated guide passage. An introduction guide communicates with the shaft bore to introduce the refrigerant gas in the swash plate chamber to the rotary valve. The introduction guide faces the boss and extends in the radial direction from the shaft bore beyond the boss. Therefore, suction efficiency of refrigerant gas from the swash plate chamber to the cylinder bore has improved.

Swash plate type compressor

A mechanism for drawing in refrigerant to front compression chambers () of a double-headed piston type compressor differs from a mechanism for drawing in refrigerant to rear compression chambers (). More specifically, the mechanism for drawing in refrigerant to the front compression chambers () include suction valves () configured by flap valves. The mechanism for drawing in refrigerant to the rear compression chambers () is configured by a rotary valve (). Thus, pulsation of the compressor is reduced, so that the generation of noise is suppressed. As a result, a quiet compressor is achieved.

Double-headed piston type compressor

In a double-headed piston type compressor provided with a rotary valve in a rotary shaft, the rotary valve has an introducing port for introducing refrigerant from a suction-pressure region through a supply passage and a respective suction port into a compression chamber. A shaft seal between a front housing and the rotary shaft for preventing leakage of refrigerant along a peripheral surface of the rotary shaft is accommodated in a shaft seal chamber formed in the front housing. A communication passage connects the shaft seal chamber to the cam chamber. A communication groove is formed in an outer peripheral surface of the rotary shaft that forms the rotary valve adjacent to the front housing for communication between the introducing port and the shaft seal chamber. The supply passage and the cam chamber are in communication through the communication groove, the shaft seal chamber and the communication passage.

A valve structure includes a central valve plate having a valve hole, and a flexible valve element having a root portion lying on the central valve plate and a bendable portion to open and close the valve hole. A retainer element has a retaining surface to restrict deformation of the valve element when it is bent toward the retainer element to open the valve hole. The profile is expressed in a two-dimensional coordinate system (x, y), and the freely bent shape is represented by coordinates (x, f(x)) obtained by pushing the valve element at an abscissa position corresponding to the center of the valve element. The retaining surface has a profile containing a coordinate (x&prime;, f(x&prime;)&minus;K) so that the profile is displaced toward the central valve plate with respect to a freely bent shape of the valve element.

Valve structure with configured retainer

Growing community of inventors

Kariya, Japan

Mitsuyo Ishikawa