JPS6152748U

JPS6152748U -

Info

Publication number: JPS6152748U
Application number: JP13819084U
Authority: JP
Priority date: 1984-09-12
Filing date: 1984-09-12
Publication date: 1986-04-09

Description

[Brief explanation of drawings]

図面は本考案に係るパワートランスミツシヨン
の変速操作用自動調圧弁の実施例を示し、第１図
及び第２図は自動調圧弁の各状態を示す断面図、
第３図は第１図における−線断面図、第４図
は変速操作構造を示す油圧油路図、第５図は圧力
変化を示すグラフ、第６図は変速構造を示す概略
図、第７図は土工車の全体側面図、第８図は別実
施を示す要部断面図、第９図、第１０図は従来構
造を示す要部断面図である。１……調圧スプール、２……リリーフ圧調整用
シリンダ、３……リリーフ用スプール、４……バ
ルブケーシング、５……出力ポート、８……溝、
Ａ……第１油室、Ｂ……第２油室、１Ａ……絞り
作用部、Ｄ_１……第１ドレンポート、Ｄ_２……第
２ドレンポート、Ｒ_１……第１油路、Ｒ_２……第
２油路、Ｒ_３…………第３油路、１８ａ，１９ａ
，２０ａ，２１ａ，２２ａ，２３ａ……油圧シリ
ンダ部。 The drawings show an embodiment of the automatic pressure regulating valve for speed change operation of a power transmission according to the present invention, and FIGS. 1 and 2 are cross-sectional views showing each state of the automatic pressure regulating valve,
Fig. 3 is a sectional view taken along the line - - in Fig. 1, Fig. 4 is a hydraulic oil path diagram showing the shift operation structure, Fig. 5 is a graph showing pressure changes, Fig. 6 is a schematic diagram showing the shift structure, and Fig. 7 is a diagram showing the shift operation structure. The figure is an overall side view of the earthmoving vehicle, FIG. 8 is a cross-sectional view of a main part showing another implementation, and FIGS. 9 and 10 are cross-sectional views of main parts showing a conventional structure. 1... Pressure adjustment spool, 2... Relief pressure adjustment cylinder, 3... Relief spool, 4... Valve casing, 5... Output port, 8... Groove,
A...First oil sac, B...Second oil sac, 1A... Throttle action part, _D1 ...First drain port, _D2 ...Second drain port, _R1 ...First oil path, _R2 ...Second oil passage, _R3 ...Third oil passage, 18a, 19a
, 20a, 21a, 22a, 23a...hydraulic cylinder section.

Claims

[Claims for Utility Model Registration] The first oil chamber A connected to the pump port P and the hydraulic cylinder parts 18a, 19a, 20a, 21a, 22a for operating the clutch of the power transmission.
, a first oil passage R ₁ that communicates with the output port 5 to 23a, a second oil passage R 2 that communicates the pump port P with the second oil chamber B, and a first oil passage R ₂ that communicates the second oil chamber B with the output port 5 to
A third oil passage R ₃ communicating with the drain port D ₁ is provided, which opens and closes the second oil passage R ₂ and the third oil passage R ₃ contrary to each other, and a throttling action portion 1A for the first oil passage R ₁ . a pressure regulating spool 1 provided with a pressure regulating spool 1, a relief spool 3 that communicates the first oil chamber A with a second drain port _D2 , and a relief spool 3 that communicates the first oil chamber A with a second drain port D2; This is an automatic pressure regulating valve for speed change operation of a power transmission, in which relief pressure adjusting cylinders 2 for changing the pressure are provided slidably with respect to a valve casing 4, and the above-mentioned pressure regulating valve is provided on the outer circumferential surface of the throttle action section 1A. This automatic pressure regulating valve for speed change operation of a power transmission has a groove 8 formed along the axis of a pressure regulating spool 1. The bottom surface of the groove 8 is connected to the pressure regulating spool 1.
An automatic pressure regulating valve for speed change operation of a power transmission according to claim 1, which is formed in a chevron shape along the axis of the invention.