Abstract: A radial type hydraulic machine, which prevents a cylinder block from bending, and does not cause imbalance in a radial direction of a pintle, is provided. For this purpose, a cylinder block (4) is supported at a casing to be relatively rotatable with respect to a pintle (3) provided to be incapable of rotating with respect to a casing (1). The cylinder block is connected to a rotating shaft (5) at one end portion, and both end portions of a cylinder bore section (6) are supported at the casing via bearings (7). Cancel ports (20a, 20b) are formed at regions of both side portions of a low pressure port (16), to which a high pressure port (15) opposes, and pressure oil of the high pressure port can be introduced into them.

Abstract: First and second pistons are provided in a body, the first piston is restricted by the body and the second piston, and the second piston is restricted by the body and a second piston restricting part. Thus, the first piston can be stopped at three positions, and the respective stop positions can be adjusted. Therefore, when rotation speeds of left and right rotating bodies are switched among three levels by a hydraulic motor, a difference of the number of rotations between the left and right rotating bodies can be eliminated, and a vehicle can be suppressed from deviating from a course while it is going straight. Further, a mounting area of the hydraulic pump can be decreased and a structure can be made simple. The rotation speed of the hydraulic motor is changed among the three levels by a simple structure and simple control without using a complex structure such as a servo valve and complex control.

Abstract: The invention can prevent a heat generation and a seizure due to a sliding friction between a piston and a cylinder in inclined shaft type and swash plate type hydraulic pumps even when they are made high speed.