| 摘要 |
A swash plate angle changing device for swash plate type piston pump motors comprising a cylinder block provided in a casing (1) to be rotatable with a shaft, a plurality of pistons slidingly inserted into the cylinder block in parallel to the shaft, and a swash plate swingably mounted to the casing to have its surface guide the plurality of pistons in a circumferential direction and adapted to change strokes of the pistons by changing its inclination. The swash plate is formed at its rear surface with first and second abutting surfaces, which forms a predetermined angle between them, and the casing is formed with a swash plate bearing surface which is perpendicular to the shaft and with which the first and second abutting surfaces contact. The casing is provided with a swash plate angle changing piston. The swash plate is swung by a resultant force of thrusts of the pistons directed toward the swash plate to a large swash plate angle position, at which the first abutting surface contacts with the swash plate bearing surface, and by a thrust of the swash plate angle changing piston to a small swash plate angle position, at which the second abutting surface contacts with the swash plate bearing surface. The center, about which the swash plate swings, is nearer to the front surface of the swash plate than to the rear surface thereof. <IMAGE> |
