Patent ID: 7380399
Filing Date: 2008-06-03
Classification: F16D,F16H

Abstract:
1. A static hydraulic continuously variable transmission for switching the transmitted power by sliding a clutch valve installed within the transmission shaft, and making a short connection with a high-pressure hydraulic path and low-pressure hydraulic path via a small diameter section of the clutch valve, comprising: a high-pressure fluid path for sending hydraulic fluid from a hydraulic pump side to a hydraulic motor side; a low-pressure fluid path for sending hydraulic fluid from the hydraulic motor side to the hydraulic pump side; a hydraulic circuit including a switching valve for switching plungers to the high-pressure path or the low-pressure path; a dual internal/external structure formed within a valve body installed between a cylinder of the hydraulic pump and a cylinder of the hydraulic motor; said hydraulic pump includes multiple plungers installed within a cylinder and said hydraulic motor includes multiple plungers within a separate cylinder, wherein a fluid path connecting the small diameter clutch valve section with the outer fluid path among the high-pressure fluid path and low-pressure fluid path, is formed between the adjoining passage openings of either the hydraulic pump cylinder or the hydraulic motor cylinder, and a distance between the inner edge of plunger holes of the cylinder forming the fluid path and the edge of the valve body, is enlarged compared to the distance between the inner edge of plunger holes of the other cylinder and the edge of the other side of the valve body.