Seal mechanism in gear pumps or motors

Abstract

A seal mechanism in gear pumps or motors, in which a pair of gears engage, so that at least one side surface of these gears is sealed by a pressure plate movable in the direction of the shaft, the said pressure plate is partitioned by a seal member in the shape of a figure "3" at the back into the low pressure zone and the high pressure zone which lead to the inlet side pressure and the outlet side pressure, respectively, both ends of the said seal member are formed in a loop-like shape, and block members for backup use, movable with respect to the pressure plate, are housed in the loop-like parts, so that the said block members may be pressed toward the low pressure side through the seal member by the liquid pressure which is connected to the high pressure zone during the operation of the gear pump or motor, so that these block members may press the end parts of the seal member to the inner wall surface of the gear bower in the housing and so that no liquid may leak from these parts.

Dependencies are inferred from the claim text.