JPH02121663U

JPH02121663U -

Info

Publication number: JPH02121663U
Application number: JP3059289U
Authority: JP
Priority date: 1989-03-17
Filing date: 1989-03-17
Publication date: 1990-10-03

Description

[Brief explanation of drawings]

第１図は本考案の実施例を示すアンロード弁の
縦断面図、第２図はプラグの形状を示す斜視図で
ある。また、第３図は従来例を示すアンロード弁
の縦断面図である。１……通路、２……ハウジング、３……スプー
ル、３Ａ……突出端、４……異径部、５……スプ
リング、６……プラグ、７……ピン、１０Ａ……
深溝、１０Ｂ……浅溝。 FIG. 1 is a longitudinal sectional view of an unload valve showing an embodiment of the present invention, and FIG. 2 is a perspective view showing the shape of a plug. Moreover, FIG. 3 is a longitudinal cross-sectional view of an unload valve showing a conventional example. 1...Passage, 2...Housing, 3...Spool, 3A...Protruding end, 4...Different diameter section, 5...Spring, 6...Plug, 7...Pin, 10A...
Deep groove, 10B...shallow groove.

Claims

[Scope of utility model registration request]

The passage connecting the hydraulic oil inlet and outlet of the hydraulic motor section of the hydrostatic transmission is blocked by a spool housed in the housing that can be freely displaced in the axial direction, and between the spool and the housing. The end of the spool is elastically supported by a spring inserted in the housing so as to protrude outward from the housing, and the spool is formed with a different diameter portion that communicates with the passage as the spool is displaced in the axial direction against the spring. In an unload valve for a pickup transmission, the spool is formed with a lateral protrusion, and the housing is provided with a member that supports the protrusion at different axial positions depending on the rotational position of the spool. Unload valve for static transmission.