Air-conditioner compressor for vehicle

A vehicle air-conditioner compressor, comprising:

• a housing having a front housing section and a rear housing section;
• a first pressure chamber disposed in the rear housing section;
• a shaft rotatably installed in the housing;
• a lug fixed at a preset position on the shaft;
• a swash plate coupled with the lug at one side thereof and rotating together with the lug;
• a piston connected to the swash plate by a shoe and moved reciprocatingly by the swash plate;
• a cylinder disposed in the housing that accommodates the piston therein;
• a bushing coupled with the swash plate and sliding along the shaft;
• a spring installed between the lug and the bushing to elastically move the swash plate connected to the bushing;
• a second pressure-sensing chamber coupled with a rod at the side of the swash plate opposite the lug,
• wherein pressure provided from the first high-pressure chamber of the rear housing section causes the rod to move and thereby changes an inclination of the swash plate;
• the rear housing section further comprises:
• a first pressure-sensing chamber into which the shaft is press-fitted;
• a first low-pressure chamber surrounding the first pressure-sensing chamber;
• and
• the first high-pressure chamber surrounding the first low-pressure chamber;
• wherein a communicating channel is formed between the first high-pressure chamber and the first pressure-sensing chamber without a control valve therebetween, and the communicating channel extends between the first high-pressure chamber and the first pressure-sensing chamber across internal space of the first low-pressure chamber;
• wherein the first low-pressure chamber is separated from the first pressure-sensing chamber in the rear housing such that the first low-pressure chamber does not communicate with the first pressure-sensing chamber in the rear housing,
• wherein a communicating hole is formed in the shaft to transfer a pressure from the first pressure-sensing chamber to the second pressure-sensing chamber through the communicating hole;
• and
• wherein the inclination of the swash plate is changed by a difference between an operating force of the rod and a spring force of the spring, and the operating force of the rod is caused by the pressure transferred from the first high-pressure chamber to the second pressure-sensing chamber through the communicating channel and the communicating hole.