JPH01103425U

JPH01103425U -

Info

Publication number: JPH01103425U
Application number: JP20135887U
Authority: JP
Priority date: 1987-12-28
Filing date: 1987-12-28
Publication date: 1989-07-12

Description

[Brief explanation of the drawing]

第１図はこの考案にかかる走行操作回路図、第
２図はこの考案にかかる走行操作回路をそなえた
油圧シヨベルの切欠き平面図、第３図はこの考案
にかかる旋回装置の断面図、第４図はこの考案の
他実施例走行操作回路図、第５図は従来技術油圧
シヨベルの全体側面図、第６図は従来技術油圧回
路図である。１，１′……下部走行体、２，３……走行モー
タ、４，４′……上部旋回体、５，６，６′，３
９，４０……走行レバー、１１……パイロツトポ
ンプ、１２，１３，３７，３８……走行弁、１５
，３５……油圧回路、１６，３６……電気回路、
１７，１７′……パイロツト弁、１９……リミツ
トスイツチ、２０，４３……開閉弁、２１……電
磁弁、２５……ブロツク部材。 FIG. 1 is a traveling operation circuit diagram according to this invention, FIG. 2 is a cutaway plan view of a hydraulic excavator equipped with a traveling operation circuit according to this invention, and FIG. 3 is a sectional view of a swing device according to this invention. FIG. 4 is a traveling operation circuit diagram of another embodiment of this invention, FIG. 5 is an overall side view of a conventional hydraulic excavator, and FIG. 6 is a conventional hydraulic circuit diagram. 1, 1'... lower traveling body, 2, 3... traveling motor, 4, 4'... upper rotating body, 5, 6, 6', 3
9, 40... Travel lever, 11... Pilot pump, 12, 13, 37, 38... Travel valve, 15
, 35...hydraulic circuit, 16, 36...electric circuit,
17, 17'...Pilot valve, 19...Limit switch, 20, 43...Opening/closing valve, 21...Solenoid valve, 25...Block member.

Claims

[Scope of utility model registration request]

The upper revolving body is rotatably provided to the lower traveling body via a swivel device, and the travel valves are switched by lever operation of a travel lever in the driver's cabin of the upper rotating body, thereby enabling rotational operation of the left and right travel motors of the lower traveling body. In the tracked construction machine, a limit switch for sensing the relative position of the lower traveling body and the upper rotating body is provided on the front side of the lower surface of the upper rotating body and a set distance away from the center of rotation of the upper rotating body, and ,
A blocking member is fixedly provided on the rear half side of the upper surface of the lower traveling body along a semicircular curve whose radius is the set distance of the limit switch, and a forward drive circuit is connected to the operating circuit for the left and right travel motors or the pilot circuit for operating the travel valve. A pilot valve for reverse switching is provided, and an on-off valve that can be switched by inputting a running signal and a solenoid valve that can be switched by operating the limit switch are installed in the oil passage that communicates the pilot pressure receiving part of the pilot valve and the pilot pump. are installed in series, and when the contact of the limit switch comes into contact with the block member when the upper revolving body is rotated, the pilot valve can be switched from the forward position to the reverse position, and the on-off valve can be switched. A running operation circuit for a tracked construction machine, characterized in that a forward/reverse switching pilot valve is configured to be able to maintain the switching position.