JPS61177977U

JPS61177977U -

Info

Publication number: JPS61177977U
Application number: JP6190285U
Authority: JP
Priority date: 1985-04-26
Filing date: 1985-04-26
Publication date: 1986-11-06

Description

[Brief explanation of the drawing]

図面は本考案の実施例を示すもので、第１図は
回路図、第２図は要部の具体例を示す断面図、第
３図はその作用説明図、第４図Ａ〜Ｄは外部信号
の例を示す説明図である。１はハンドポンプ、２はハンドル、３はコント
ロールバルブ、４は可変ポンプ、５はステアリン
グシリンダ、６は切換弁、６ａ，６ｂは第１、第
２位置、８はアシスト回路、１０は減圧弁、１０
ａは連通位置、１０ｂはドレン位置、１１はアシ
ストポンプ、１３はパイロツト圧作用部。 The drawings show an embodiment of the present invention: Fig. 1 is a circuit diagram, Fig. 2 is a sectional view showing a specific example of the main part, Fig. 3 is an explanatory diagram of its operation, and Figs. 4 A to D are external views. It is an explanatory diagram showing an example of a signal. 1 is a hand pump, 2 is a handle, 3 is a control valve, 4 is a variable pump, 5 is a steering cylinder, 6 is a switching valve, 6a, 6b are first and second positions, 8 is an assist circuit, 10 is a pressure reducing valve, 10
a is a communication position, 10b is a drain position, 11 is an assist pump, and 13 is a pilot pressure acting part.

Claims

[Scope of utility model registration request]

A hand pump 1 is directly connected to and driven by the steering wheel 2 and discharges oil in proportion to its rotation speed, and pressure oil from a variable pump 4 is controlled by the oil discharged from the hand pump 1 to the steering cylinder 5. It is interposed between a supply control valve 3 and left and right pilot circuits 1a and 1b connected to left and right ports 7a and 7b of the hand pump 1,
and a first position 6a communicating with the pilot circuit;
It has a second position 6b that communicates the ports 7a and 7b of the hand pump 1 with the assist circuit 8 and drains the return side of the pilot circuit, and further has a second position 6b that connects the ports 7a and 7b of the hand pump 1 to the assist circuit 8 and drains the return side of the pilot circuit. 2
The left and right switching valves 6, 6 are interposed so as to be switched to the position 6b, the assist pump 11 is connected to the assist circuit 8, and the assist pump 11 is interposed in the assist circuit 8 and is connected to the communicating position 10a and the drain position 10b. have,
It consists of a pressure reducing valve 10 which is switched to the communication position 10a when pressure from the high pressure side pilot circuit acts on the back pressure part, and an external signal receiving part is provided on the side opposite to the back pressure part of the pressure reducing valve 10. 1. A power steering device comprising: an external signal generating device connected to the external signal receiving section.