Shift actuator

摘要

A shift actuator of the present invention includes a first and a second fluid pressure chamber for providing fluid pressure to each of a first and a second piston defined in a cylinder and a shift operating member inserted and disposed between the first piston and the second piston to move back and forth along the axial direction. On a side surface to the axial direction of the cylinder, an opening portion to which the shift operating member is inserted is formed. The opening portion is provided opening only to a part of the circumferential direction of the cylinder, and a lower end of the opening portion in a circumferential direction of the cylinder reaches a just under position in the vertical direction of the cylinder. This enables to discharge foreign matters included in hydraulic oil in the cylinder according to a stroke of the piston, with a simple configuration.

主权项

1. A shift actuator comprising:
a cylinder; a first piston and a second piston coaxially arranged in the cylinder; a first and a second fluid pressure chamber defined in the cylinder for providing fluid pressure to each of the first and the second piston; a shaft disposed so that the axial direction thereof is parallel to the axial direction of the cylinder; and a shift operating member supported by the shaft with inserted and disposed between the first piston and the second piston to move back and forth along the axial direction of the shaft, and wherein: an opening portion to which the shift operating member is inserted is formed on a lateral side surface to the axial direction of the cylinder, the opening portion is provided opening only to a part of the circumferential direction of the cylinder, and a lower end of the opening portion in the circumferential direction of the cylinder reaches a position that is below the opening portion of the cylinder in a vertical direction of the cylinder, wherein the opening portion is formed to be a shape comprising: a lateral groove having a length dimension of the axial direction larger than a movable range of the shift operating member, and a vertical groove further extended to the lower side beyond a lower end of the lateral groove and having a length dimension of the axial direction shorter than the lateral groove, wherein the opening portion is formed to be an approximate T-shape comprising the lateral groove and the vertical groove, and a lower end of the vertical groove in the circumferential direction of the cylinder reaches a position that is below the opening portion of the cylinder in the vertical direction.