JPS6036995U

JPS6036995U - 2-speed motor switching hydraulic circuit

Info

Publication number: JPS6036995U
Application number: JP12902883U
Authority: JP
Inventors: 晋中村; 岩田　益治
Original assignee: 古河鉱業株式会社
Priority date: 1983-08-20
Filing date: 1983-08-20
Publication date: 1985-03-14
Also published as: JPS6326395Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の、第２図は本考案に係る２速モータの切
換油圧回路である。３〜８・・・油路切換弁、１０・・・センターバイパス
通路、１１・・・平行圧力通路、１２・・・排油通路、
１４・・・油圧モータ、１５・・・油圧モータ高低速切
換部材、１６・・・スプリング、１７・・・シリンダ、
１９・・・シーケンス弁、２０・・・チェック弁、２２
・・・アキュームレータ、２３．２８・・・切換弁、２
４・・・パイロットオペレーテイドチェック弁、２５・
・・給排管路、２７・・・パイロット管路。FIG. 1 shows a conventional switching hydraulic circuit, and FIG. 2 shows a switching hydraulic circuit for a two-speed motor according to the present invention. 3-8... Oil passage switching valve, 10... Center bypass passage, 11... Parallel pressure passage, 12... Oil drain passage,
14... Hydraulic motor, 15... Hydraulic motor high/low speed switching member, 16... Spring, 17... Cylinder,
19...Sequence valve, 20...Check valve, 22
...Accumulator, 23.28...Switching valve, 2
4... Pilot operated check valve, 25.
... Supply and discharge pipe line, 27... Pilot pipe line.

Claims

[Scope of utility model registration request]

A switching member 15 for switching between high and low speeds of the hydraulic motor 14 that is always biased in one direction by a spring 16, a cylinder 17 that operates the switching member 15 against the spring 16 when pressure oil is applied, and this cylinder. A pilot operated check valve 24 is configured to allow the flow of oil into the cylinder 17 and prevent its reverse flow, but is actuated by pilot pressure to allow the reverse flow, and connects the cylinder 17 and the pilot operated check valve 24. conduit 26,
It has a supply/discharge pipe 25 and a pilot pipe 27 that are connected to the pilot operated check valve 28, and the supply/discharge pipe 25 and the pilot pipe 27 are connected to the oil supply side, oil discharge side, or this side by a switching valve 28. Conversely, the pressure oil is supplied to and discharged from the cylinder 17 by switching the switching member 15.
The oil supply port 28b of the switching valve 28 is configured to bypass the center at a neutral position and return pressure oil from the pump to the tank side. The switching valve is connected to the parallel pressure passage 11 of the switching valve assembly in which the switching valves 3...8 are connected in parallel, and this switching valve receives pressure oil that is bypassed in the center from the switching valves 3...8. A switching hydraulic circuit for a two-speed motor, characterized in that the circuit is connected so as to always return the motor to the tank side.