JPH0266703U

JPH0266703U -

Info

Publication number: JPH0266703U
Application number: JP14358988U
Authority: JP
Priority date: 1988-11-02
Filing date: 1988-11-02
Publication date: 1990-05-21

Description

[Brief explanation of drawings]

第１図及び第２図は本考案の第１実施例を示し
、第１図は油圧回路図、第２図は容量制御弁の切
換位置、入口側圧力および傾転に必要な力等の関
係を示す特性線図、第３図は第２の実施例を示す
油圧回路図、第４図は第３の実施例を示す油圧回
路図、第５図ないし第７は従来技術を示し、第５
図は油圧回路図、第６は油圧モータの縦断面図、
第７図は入口側圧力と傾転に必要な力との関係を
示す特性線図である。１……油圧ポンプ、２……タンク、４……油圧
モータ、４Ａ……容量可変部、５，５２……容量
可変アクチユエータ、８Ａ，８Ｂ……主管路、９
……方向切換弁、１３……シヤトル弁（高圧選択
弁）、１４……制御管路、１５……ドレン管路、
１６……パイロツト管路、３１，４１，５１……
容量制御弁、３３……減圧弁。 Figures 1 and 2 show the first embodiment of the present invention, Figure 1 is a hydraulic circuit diagram, and Figure 2 is the relationship between the switching position of the capacity control valve, the pressure on the inlet side, the force required for tilting, etc. FIG. 3 is a hydraulic circuit diagram showing the second embodiment, FIG. 4 is a hydraulic circuit diagram showing the third embodiment, FIGS. 5 to 7 show the prior art, and FIG.
The figure is a hydraulic circuit diagram, the sixth is a vertical cross-sectional view of the hydraulic motor,
FIG. 7 is a characteristic diagram showing the relationship between the inlet side pressure and the force required for tilting. DESCRIPTION OF SYMBOLS 1... Hydraulic pump, 2... Tank, 4... Hydraulic motor, 4A... Variable capacity part, 5, 52... Variable capacity actuator, 8A, 8B... Main conduit, 9
... Direction switching valve, 13 ... Shuttle valve (high pressure selection valve), 14 ... Control pipe line, 15 ... Drain pipe line,
16... Pilot pipe line, 31, 41, 51...
Capacity control valve, 33...pressure reducing valve.

補正平１．１．２６図面の簡単な説明を次のように補正する。明細書第２２頁第１０行「第７は」とあるのを
、「第７図は」と補正する。明細書第２２頁第１１行「第６は」とあるのを
、「第６図は」と補正する。Amendment 1.1.26 Hei 1. The brief description of the drawing is amended as follows. In the 10th line of page 22 of the specification, the phrase "7th is" is amended to read "Fig. 7 is". In the 11th line of page 22 of the specification, the phrase "6th is" has been amended to read "Fig. 6 is".

Claims

[Scope of utility model registration request]

a variable displacement hydraulic motor having a variable displacement section; a variable displacement actuator that tilts and drives the variable displacement section of the hydraulic motor; a pair of main pipes connecting the hydraulic motor to a hydraulic source; a directional switching valve provided midway to switch the rotational direction of the hydraulic motor; a directional switching valve located between the directional switching valve and the hydraulic motor and disposed between the pair of main pipes;
a high pressure selection valve that selects pressure oil on the high pressure side of each of the main pipes and supplies it to the variable capacity actuator;
A variable displacement hydraulic motor control circuit comprising a displacement control valve that switches and controls the pressure oil supplied to the variable displacement actuator by causing the pressure oil from the high pressure selection valve to act as pilot pressure,
The capacity control valve is configured by a hydraulic pilot type directional switching valve with at least three positions, and each switching position of the capacity control valve generates a different tilting force on the variable capacity actuator. Variable displacement hydraulic motor control circuit.