Kabushiki Kaisha Toyoda Jidoshokki Seisakusho

Kabushiki Kaisha Toyota Jidoshokki

Hitoshi Inukai

Toshiro Fujii

Koichi Ito

Kazuaki Iwama

Hiromi Kitayama

Hayato Ikeda

Naoya Yokomachi

Jun Kondo

Hideo Mori

Yuichi Kato

Kazuhito Kawasumi

Genki Hayashi

Kazuhiro Hotta

Naoki Goto

Hiroko Asaoka

Nobutoshi Bannno

Ryo Katoh

A swash plate type compressor includes a cylinder block having a crank chamber, a rotary shaft, a swash plate, pistons and fasteners extending through the crank chamber between any two adjacent pistons. The cylinder block further includes ribs projecting inward from inner surface of the crank chamber, extending in axial direction of the rotary shaft and being arranged so that the pistons and the fasteners are positioned alternately between any two adjacent ribs, a piston-side wall surface forming the inner surface and being positioned between any two adjacent ribs located on opposite side of the piston and a fastener-side wall surface forming the inner surface and being positioned between any two adjacent ribs located on opposite side of the fastener The piston-side wall surface is spaced farther away from the rotary shaft than the fastener-side wall surface in radial direction of the rotary shaft.

Swash plate type compressor

Piston for compressor

A compressor has a compression chamber and a discharge region. The discharge region receives the compressed gas discharged from the compression chamber. A relief valve is mounted to inside of the wall in the discharge region. The relief valve connects the discharge region with the exterior of the compressor so as to discharge the excessively raised pressure in the discharge region.

Compressor with discharge chamber relief valve

A swash plate type compressor is disclosed. A swash plate mounted on a rotary shaft reciprocally drives a double headed piston in cylinder bores. The rotary shaft is supported by valve plates, via a pair of tapered roller bearings. Outer races of the bearings are slidably fitted into sleeves, respectively. A disc spring disposed between protrusions for holding a front housing and the outer race is resiliently deformed for applying a preload to the rotary shaft. Protrusions for holding a rear housing abut against the outer race. Cylinder blocks, valve plates and housings are tightly connected one to another by a plurality of through bolts.

Support mechanism for a rotary shaft used in a swash plate type

A piston type compressor is disclosed, which comprises a cylinder block having axial cylinder bores, pistons defining compression chambers in the bores, a drive shaft, and a gas suction and discharge chambers in a housing. A valve receiving chamber is formed around the drive shaft in the cylinder block, for accommodating a rotary valve which rotates in synchronism with rotation of the drive shaft. The rotary valve has a suction passage formed therein for providing gases from the gas suction chamber to a compression chamber during the chamber's gas suction stroke. A plurality of gas communication passages are formed in the cylinder block in association with the compression chambers, each having a first port open to the associated cylinder bore and a second port open to the valve receiving chamber. The first port is located at a position (P2) apart by a predetermined distance (L) from a top dead center position (P1) of the associated piston. The rotary valve has a bypass passage formed therein, for permitting one communication passage, isolated from both the compression chambers and the gas suction chamber, to communicate with another communication passage corresponding to a compression chamber in a compression stroke.

Gas guiding mechanism in a piston type compressor

A swash plate type compressor comprises a cylinder block cooperating to form therein a compartment accommodating therein a swash plate and also serving as a suction chamber of the compressor, and a drive shaft rotatably supported in the cylinder block and having formed therein an axial discharge passage connecting front and rear discharge chambers. The compressor further includes a pair of front and rear rotary type suction valves mounted on the drive shaft for rotation therewith and fitted in bores formed centrally in the cylinder block such that one axial end thereof is exposed to suction pressure and the other end to discharge pressure of the refrigerant gas. Each suction valve has formed therein a passage which is in constant communication with the swash plate compartment and is operable to bring its passage in communication successively with fluid working chambers in synchronism with the rotation of the drive shaft. The drive shaft is formed with a lubricating oil hole extending radially from its central discharge passage to its outer periphery and directed to feed lubricating oil toward the sliding contact surfaces between the suction valve and its accommodation bore.

A refrigerant gas suction valve mechanism for a reciprocating piston type compressor is disclosed. The mechanism has a drive shaft rotatably disposed in a gas receiving chamber where uncompressed gas is introduced, Double- headed pistons provided in cylinder bores compress the gas when the pistons move from the bottom dead center to the top dead center. A suction port selectively permits and blocks communication between the suction passage and the compression chambers. A resilient member holds a rotary valve in contact with an inner wall of a recessed chamber with predetermined force. The suction port is maintained at a predetermined distance from a point where the pistons reach the top dead center so that the suction port is closed by the pistons before the pistons reach the top dead center.

Refrigerant gas guiding mechanism in piston type compressor

A piston type compressor has a plurality of cylinder bores in which a plurality of pistons reciprocate to effect suction, compression and discharge of refrigerant gas in response to rotation of a drive shaft. The compressor has a gas receiving chamber for receiving the refrigerant gas before compression, a discharge chamber for receiving the compressed gas, and at least one rotary valve mounted on the drive shaft to be rotatable with the drive shaft. The rotary valve has a suction passageway for providing fluid communication between the gas receiving chamber and each of the compression chambers formed in the cylinder bores. A groove is provided on the outer circumferential wall of the rotary valve. The groove is connected with the outlet of the suction passageway and extends to a vicinity of the opposing end portions along the outer circumferential wall. The groove supplies the lubricant oil within the refrigerant gas in the suction passageway to and between the outer circumferential wall of the rotary valve and the inner wall of the recessed chamber during the rotation of the rotary valve.

Piston type compressor with a rotary suction valve

A swash plate type compressor comprises a cylinder block having formed therein a compartment accommodating therein a swash plate and a plurality of axial cylinder bores each receiving therein a reciprocally movable double-headed piston. The compressor further comprises a drive shaft having formed therein a discharge passage in communication with front and rear discharge chambers in front and rear housings, respectively, which are fastened to the axial ends of the cylinder block. The drive shaft is supported by a pair of front and rear tapered roller bearings and these two bearings are arranged in such a way that at least part of refrigerant gas discharged into either one of the discharge chambers flows through both of the front and rear bearings so that the bearings are lubricated by oil contained in and entrained by the refrigerant gas.

A piston type compressor is disclosed, which includes pistons disposed in bores of a cylinder block, to be reciprocated by a piston driving mechanism in cooperation with a drive shaft. A valve receiving chamber is formed around the drive shaft in the cylinder block, for receiving a rotary valve to rotate together with the drive shaft. The rotary valve has a suction passage formed therein for providing gases from a gas suction chamber to a compression chamber defined in each bore. A plurality of communication passages are formed in the cylinder block in association with the compression chambers, to provide gas communication between the compression chambers and the valve's suction passage. A bypass passage is formed on the rotary valve, and permits one communication passage, associated with one of the compression chambers which is at a final stage of a compression stroke, to communicate with another communication passage, associated with another compression chamber which is at a start stage of the compression stroke. The compressor further includes a device, provided on an outer surface of each piston, for catching gas axially leaking along the outer surface of the piston. The gas catching device guides gas, caught by the gas catching device at the final stage of the compression stroke, to the communication passage corresponding to its associated compression chamber.

A swash plate type compressor which includes a pair of cylinder blocks. The cylinder blocks contains a crank case and a plurality of cylinders leading to a suction port. A pair of housing sections cover the cylinder blocks, and contain a suction chamber leading to each about the center of the cylinders, and a discharge chamber which is fluidly connected to the cylinders. The cylinder blocks rotatably support a drive shaft. The suction chamber contains a shaft sealing device in order to seal a forward section of the drive shaft. A refrigerant fluid within the crank case is sucked into the cylinders via the suction chamber. A refrigerant passage is provided along the central axis of the drive shaft. A plurality of inlet and outlet ports are connected to the refrigerant passage and to the crank case and suction chamber. The refrigerant passage, the outlet ports and the inlet ports form a refrigerant suction passage. Consequently, the refrigerant concentration in the suction chamber is rendered uniform, and the reliability of the shaft sealing device is improved.

Growing community of inventors

Kariya, Japan

Hitoshi Inukai