JPH02144875U - - Google Patents
Info
- Publication number
- JPH02144875U JPH02144875U JP2255589U JP2255589U JPH02144875U JP H02144875 U JPH02144875 U JP H02144875U JP 2255589 U JP2255589 U JP 2255589U JP 2255589 U JP2255589 U JP 2255589U JP H02144875 U JPH02144875 U JP H02144875U
- Authority
- JP
- Japan
- Prior art keywords
- steering
- hydraulic pump
- wheel
- cylinder
- steering cylinder
- 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.)
- Pending
Links
- 238000010276 construction Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
Description
第１図および第２図は本考案の第１の実施例を
示し、第１図は本考案に係るステアリング用油圧
制御装置の回路図、第２図は車輪の操舵機構を説
明する建設機械の上面図である。第３図は本考案
の第２の実施例を示すステアリング用油圧制御装
置の回路図である。
１……原動機、２……ステアリングポンプ、３
……ステアリングバルブ、３ａ……ステアリング
ハンドル、４，９……ステアリングシリンダ、５
……油圧ポンプ、６…電磁弁、８……制御弁、２
２……絞り、３３……前輪、４３……後輪、５１
……差動トランス、５２……微分回路、５３……
サーボ弁、ＳＷ１……スイツチ。
1 and 2 show a first embodiment of the present invention, FIG. 1 is a circuit diagram of a steering hydraulic control device according to the present invention, and FIG. 2 is a diagram of a construction machine illustrating a wheel steering mechanism. FIG. FIG. 3 is a circuit diagram of a steering hydraulic control device showing a second embodiment of the present invention. 1... Prime mover, 2... Steering pump, 3
... Steering valve, 3a ... Steering handle, 4, 9 ... Steering cylinder, 5
... Hydraulic pump, 6 ... Solenoid valve, 8 ... Control valve, 2
2...Aperture, 33...Front wheel, 43...Rear wheel, 51
... Differential transformer, 52 ... Differential circuit, 53 ...
Servo valve, SW1... switch.
Claims (1)
ポンプと、２輪操舵および４輪操舵のいずれかの
指令信号を出力する信号出力手段とを備えた建設
機械のステアリング用油圧制御装置において、 前記ステアリング用油圧ポンプからの吐出油に
より伸縮して前輪を操舵する第１のステアリング
シリンダと、 この第１のステアリングシリンダと前記ステア
リング用油圧ポンプとの間に介装され、ステアリ
ングハンドルの操作速度、操作方向に応じて前記
第１のステアリングシリンダに導かれる圧油の流
量および方向を制御するステアリングバルブと、 前記作業用油圧ポンプからの吐出油により伸縮
して後輪を操舵する第２のステアリングシリンダ
と、 前記ステアリングハンドルの操作速度および操
作方向を検出する検出手段と、 前記信号出力手段から４輪操舵の指令信号が出
力されているときには、前記検出手段の出力信号
に基づき前記第１のステアリングシリンダに同期
して前輪、後輪が逆位相で操舵されるように、前
記第２のステアリングシリンダに導かれる前記油
圧ポンプからの圧油の流量および方向を制御する
制御弁とを具備することを特徴とする建設機械の
ステアリング用油圧制御装置。[Scope of Claim for Utility Model Registration] For steering of construction machinery equipped with a hydraulic pump for steering, a hydraulic pump for work, and a signal output means for outputting a command signal for either two-wheel steering or four-wheel steering. In the hydraulic control device, a first steering cylinder expands and contracts with oil discharged from the steering hydraulic pump to steer the front wheels; and a first steering cylinder interposed between the first steering cylinder and the steering hydraulic pump, a steering valve that controls the flow rate and direction of pressure oil guided to the first steering cylinder according to the operating speed and direction of the steering wheel; and a steering valve that expands and contracts with the oil discharged from the working hydraulic pump to steer the rear wheels. a second steering cylinder; a detection means for detecting the operation speed and direction of the steering handle; and when the signal output means outputs a four-wheel steering command signal, the signal output means detects the operation speed and the operation direction of the steering wheel based on the output signal of the detection means. a control valve that controls the flow rate and direction of pressure oil from the hydraulic pump guided to the second steering cylinder so that the front wheels and rear wheels are steered in opposite phases in synchronization with the first steering cylinder; A hydraulic control device for steering of construction machinery, characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2255589U JPH02144875U (en) | 1989-02-28 | 1989-02-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2255589U JPH02144875U (en) | 1989-02-28 | 1989-02-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02144875U true JPH02144875U (en) | 1990-12-07 |
Family
ID=31525561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2255589U Pending JPH02144875U (en) | 1989-02-28 | 1989-02-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02144875U (en) |
-
1989
- 1989-02-28 JP JP2255589U patent/JPH02144875U/ja active Pending
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