JPS6135959U - Construction vehicle boom shock absorber - Google Patents

Construction vehicle boom shock absorber

Info

Publication number
JPS6135959U
JPS6135959U JP11886984U JP11886984U JPS6135959U JP S6135959 U JPS6135959 U JP S6135959U JP 11886984 U JP11886984 U JP 11886984U JP 11886984 U JP11886984 U JP 11886984U JP S6135959 U JPS6135959 U JP S6135959U
Authority
JP
Japan
Prior art keywords
cushion
pilot
boom
valve
switching valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP11886984U
Other languages
Japanese (ja)
Other versions
JPH045579Y2 (en
Inventor
隆太郎 亀下
Original Assignee
ティー・シー・エム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ティー・シー・エム株式会社 filed Critical ティー・シー・エム株式会社
Priority to JP11886984U priority Critical patent/JPS6135959U/en
Publication of JPS6135959U publication Critical patent/JPS6135959U/en
Application granted granted Critical
Publication of JPH045579Y2 publication Critical patent/JPH045579Y2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

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

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

第１図は本考案実施例の構成図、第２図は切換弁のパイ
ロット圧力とスプール移動量の関係を示す線図てある。 １：ブームシリング、２：切換弁、２ａ：パイロット室
、３：電気信号作動式クッション弁、３ａ：通常位置、
３ｂ：クッション位置、４：第一リリーフ弁、５：パイ
ロット回路、６：第二リリーフ弁、７：クッション回路
、８：ブーム、９：電気スイッチ（リミットスイッチ）
。FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the pilot pressure of the switching valve and the amount of spool movement. 1: Boom silling, 2: Switching valve, 2a: Pilot room, 3: Electric signal activated cushion valve, 3a: Normal position,
3b: Cushion position, 4: First relief valve, 5: Pilot circuit, 6: Second relief valve, 7: Cushion circuit, 8: Boom, 9: Electric switch (limit switch)
.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] パイロット圧力に比例してスプールが移動するパイロッ
ト作動式切換弁がブームシリンダ用の切検弁として利用
され、該切換弁のパイロット圧力を制御する電気信号作
動式クッション弁が設けられ、該クッション弁は、切換
弁のパイロット室を通常圧のパイロット回路に接続する
通常位置と切換弁のパイロット室を前記通常圧より少し
低いクッション圧のクッション回路に接続スルクッショ
ン位置とを有せしめられ、ブームの上死点手前で作動し
て電気信号によりクッション弁をクッション位置に切換
える電気スイッチがブーム当接位置に設けられたことを
特徴とする建設車両のブーム緩衝装置。A pilot-operated switching valve whose spool moves in proportion to the pilot pressure is used as a check valve for the boom cylinder, and an electric signal-operated cushion valve is provided to control the pilot pressure of the switching valve. , a normal position where the pilot chamber of the switching valve is connected to a pilot circuit with normal pressure, and a through-cushion position where the pilot chamber of the switching valve is connected to a cushion circuit with a cushion pressure slightly lower than the normal pressure, and the upper dead end of the boom is 1. A boom shock absorber for a construction vehicle, characterized in that an electric switch is provided at a boom abutting position, the electric switch being activated before the point is turned on and switching the cushion valve to the cushion position by an electric signal.
JP11886984U 1984-07-31 1984-07-31 Construction vehicle boom shock absorber Granted JPS6135959U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11886984U JPS6135959U (en) 1984-07-31 1984-07-31 Construction vehicle boom shock absorber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11886984U JPS6135959U (en) 1984-07-31 1984-07-31 Construction vehicle boom shock absorber

Publications (2)

Publication Number Publication Date
JPS6135959U true JPS6135959U (en) 1986-03-05
JPH045579Y2 JPH045579Y2 (en) 1992-02-17

Family

ID=30677748

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11886984U Granted JPS6135959U (en) 1984-07-31 1984-07-31 Construction vehicle boom shock absorber

Country Status (1)

Country Link
JP (1) JPS6135959U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63219790A (en) * 1987-03-09 1988-09-13 日立建機株式会社 Derricking safety device for earth drill front
WO1990001588A1 (en) * 1988-08-02 1990-02-22 Kabushiki Kaisha Komatsu Seisakusho Moving speed regulator for hydraulically driven working machines
WO2001011151A1 (en) * 1999-08-04 2001-02-15 Shin Caterpillar Mitsubishi Ltd. Working arm control device of working machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63219790A (en) * 1987-03-09 1988-09-13 日立建機株式会社 Derricking safety device for earth drill front
WO1990001588A1 (en) * 1988-08-02 1990-02-22 Kabushiki Kaisha Komatsu Seisakusho Moving speed regulator for hydraulically driven working machines
WO2001011151A1 (en) * 1999-08-04 2001-02-15 Shin Caterpillar Mitsubishi Ltd. Working arm control device of working machine
EP1127986A1 (en) * 1999-08-04 2001-08-29 Shin Caterpillar Mitsubishi Ltd. Working arm control device of working machine
EP1127986A4 (en) * 1999-08-04 2007-01-03 Caterpillar Mitsubishi Ltd Working arm control device of working machine

Also Published As

Publication number Publication date
JPH045579Y2 (en) 1992-02-17

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