Rotary Fluid Machine

摘要

A rotary fluid machine that reduces fluid leakage from a gear pump or gear motor and achieves improvement in responsiveness is provided. The present invention is configured such that force of pressing a side plate toward gears by a seal member provided between the side plate and a case and performing pressure compartment is partly strong, not uniform along the entire length of the seal member. Specifically, for example, a gear pump comprises an assembly including a pair of gears, a side plate sealing a side surface of the gears, and a seal block sealing tooth tips of the gears, a case housing the pump assembly, and a seal member being arranged between the side plate or the seal block and the case and along a notch portion formed in the side plate or the seal block. The seal member is wider at a portion in a position passing through a place with large pressure fluctuations than at other portions.

主权项

1. A rotary fluid machine, comprising:
an assembly including a pair of gears, a side plate arranged on a side surface of the gears, and a seal block arranged to cover circumferential portions of the gears; a case housing the assembly; and a seal member being arranged between the side plate or the seal block and the case and along a notch portion formed in the side plate or the seal block to define a high-pressure portion and a low-pressure portion in the case, wherein the seal member or the notch portion is configured such that, when the assembly is incorporated into the case, force of the seal member pressing the side plate toward the gears becomes partly larger depending on the position of the seal member.