JPH0165902U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図……本考案による真空防止油圧回路を含
む油圧走行回路の１実施例図。第２図……第１図
において真空防止油圧回路が作用していない作用
図。第３図……第１図において真空防止油圧回路
が作用している作用図。第４図……従来による真
空防止回路を含む油圧走行回路の１実施例図。 １……主油圧ポンプ、２……パイロツト油圧ポ
ンプ、３……走行ペダル、４……油圧スイツチ、
５……パイロツト油圧回路、６……パイロツト切
換弁、７……走行切換弁、８……油圧走行モータ
、９，９……逆止弁、１０……電気回路、１１…
…電磁式切換弁、１２……真空防止油圧回路、１
２―１……真空防止回路、１３……主油圧回路、
１４……ドレン回路、１５，１５……安全弁、１
６……リリーフ弁、１７……作動油タンク、１８
……リリーフ弁。 FIG. 1 is an embodiment of a hydraulic travel circuit including a vacuum prevention hydraulic circuit according to the present invention. Fig. 2: An operational diagram in which the vacuum prevention hydraulic circuit in Fig. 1 is not in operation. Fig. 3...A diagram showing the operation of the vacuum prevention hydraulic circuit in Fig. 1. FIG. 4: An embodiment of a hydraulic travel circuit including a conventional vacuum prevention circuit. 1... Main hydraulic pump, 2... Pilot hydraulic pump, 3... Travel pedal, 4... Hydraulic switch,
5...Pilot hydraulic circuit, 6...Pilot switching valve, 7...Travel switching valve, 8...Hydraulic travel motor, 9,9...Check valve, 10...Electric circuit, 11...
...Solenoid switching valve, 12...Vacuum prevention hydraulic circuit, 1
2-1...Vacuum prevention circuit, 13...Main hydraulic circuit,
14...Drain circuit, 15,15...Safety valve, 1
6... Relief valve, 17... Hydraulic oil tank, 18
...Relief valve.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 走行切換弁７を切換えるためのパイロツト油圧
回路５中において、走行ペダル３とパイロツト切
換弁６との間のパイロツト油圧を検知し開閉する
電気回路１０中の油圧スイツチ４、パイロツト油
圧ポンプ２と走行ペダル３との間のパイロツト油
圧回路５へ、ドレン回路１４へ及び逆止弁９，９
への３ポートを備え、かつ電気回路１０の構成の
１部である電磁石を備える電磁式切換弁１１並び
に電磁式切換弁１１及び油圧走行モータ８への２
ポートを備える逆止弁９，９から構成されること
を特徴とする油圧走行モータの真空防止油圧回路
。 In the pilot hydraulic circuit 5 for switching the travel selector valve 7, the hydraulic switch 4, the pilot hydraulic pump 2, and the travel pedal in the electric circuit 10 that detects the pilot hydraulic pressure between the travel pedal 3 and the pilot selector valve 6 and opens and closes it. 3 to the pilot hydraulic circuit 5, to the drain circuit 14, and to the check valves 9, 9.
An electromagnetic switching valve 11 with three ports to the electric circuit 10 and an electromagnet that is part of the configuration of the electric circuit 10;
A vacuum prevention hydraulic circuit for a hydraulic travel motor, characterized in that it is composed of check valves 9, 9 each having a port.