JPH0441545U - - Google Patents
Info
- Publication number
- JPH0441545U JPH0441545U JP8067390U JP8067390U JPH0441545U JP H0441545 U JPH0441545 U JP H0441545U JP 8067390 U JP8067390 U JP 8067390U JP 8067390 U JP8067390 U JP 8067390U JP H0441545 U JPH0441545 U JP H0441545U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- working machine
- chamber
- work machine
- pilot
- 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
Links
- 230000008602 contraction Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Operation Control Of Excavators (AREA)
Description
第１図は本考案の第１実施例を示す油圧回路図
、第２図は操作レバーと作業機用操作弁を連結す
るリンク機構の正面図、第３図は第２実施例を示
す油圧回路図、第４図、第５図は従来の油圧回路
図である。
２０は油圧ポンプ、２１は作業機シリンダー、
２１ａは伸長室、２１ｂは縮小室、２２は作業機
用操作弁、２３は上げ用管路、２４は下げ用管路
、２５はパイロツト作動式チエツク弁、２６，２
７はバイパス路、２８は電磁弁。
Fig. 1 is a hydraulic circuit diagram showing a first embodiment of the present invention, Fig. 2 is a front view of a link mechanism connecting an operating lever and a working machine operating valve, and Fig. 3 is a hydraulic circuit diagram showing a second embodiment. 4 and 5 are conventional hydraulic circuit diagrams. 20 is a hydraulic pump, 21 is a work machine cylinder,
21a is an extension chamber, 21b is a contraction chamber, 22 is a working machine operation valve, 23 is a raising pipe, 24 is a lowering pipe, 25 is a pilot operated check valve, 26,2
7 is a bypass path, and 28 is a solenoid valve.
Claims (1)
用操作弁２２，２２で左右の作業機シリンダ２１
，２１の伸長室２１ａと縮小室２１ｂに供給する
モータグレーダの作業機用油圧回路において、 前記作業機用操作弁２２を伸長室２１ａと縮小
室２１ｂを連通して油圧ポンプ吐出側とタンク側
に連通する浮位置Ｃを有するものとし、 前記作業機シリンダー２１の縮小室２１ｂに接
続した上げ側管路２３にパイロツト作動式チエツ
ク弁２５を設け、この上げ側管路２３におけるパ
イロツト作動式チエツク弁２５の前後を短絡する
バイパス路２７又は作業機シリンダ２１の伸長室
２１ａと縮小室２１ｂを短絡するバイパス路２６
に電磁弁２８を設け、 前記作業機用操作弁２２と操作レバー３２を連
結するリンク機構に、作業機用操作弁２２が浮位
置Ｃとなると前記電磁弁２８を連通位置Ｉとする
手段を設けたことを特徴とするモータグレーダの
作業機用油圧回路。 (2) 前記回路においてブレード押付力一定自動
制御装置を装着した時には作業機用操作弁２２が
浮位置Ｃとなると自動制御装置がｏｆｆとなるよ
うな電気的手段を設けたことを特徴とするモータ
グレーダ。[Scope of Claim for Utility Model Registration] (1) Pressure oil discharged from the hydraulic pump 20 is transferred to the left and right work machine cylinders 21 by the left and right work machine operation valves 22, 22.
, 21, the working machine operating valve 22 is connected to the hydraulic pump discharge side and the tank side by communicating the extension chamber 21a and the contraction chamber 21b. A pilot-operated check valve 25 is provided in the raised pipe line 23 connected to the reduction chamber 21b of the working machine cylinder 21, and the pilot-operated check valve 25 in the raised pipe line 23 or a bypass path 26 that short-circuits the extension chamber 21a and the contraction chamber 21b of the working machine cylinder 21.
a solenoid valve 28 is provided in the link mechanism connecting the work machine operating valve 22 and the operating lever 32, and a means for bringing the solenoid valve 28 into the communication position I when the work machine operating valve 22 is in the floating position C is provided. A hydraulic circuit for a motor grader working machine, which is characterized by: (2) A motor characterized in that, when an automatic control device for constant blade pressing force is installed in the circuit, an electric means is provided so that the automatic control device is turned off when the working machine operation valve 22 reaches the floating position C. Grader.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990080673U JPH0752189Y2 (en) | 1990-07-31 | 1990-07-31 | Hydraulic circuit for work machine of motor grader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990080673U JPH0752189Y2 (en) | 1990-07-31 | 1990-07-31 | Hydraulic circuit for work machine of motor grader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0441545U true JPH0441545U (en) | 1992-04-08 |
| JPH0752189Y2 JPH0752189Y2 (en) | 1995-11-29 |
Family
ID=31625945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990080673U Expired - Lifetime JPH0752189Y2 (en) | 1990-07-31 | 1990-07-31 | Hydraulic circuit for work machine of motor grader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0752189Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62125161U (en) * | 1986-01-29 | 1987-08-08 |
-
1990
- 1990-07-31 JP JP1990080673U patent/JPH0752189Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62125161U (en) * | 1986-01-29 | 1987-08-08 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0752189Y2 (en) | 1995-11-29 |
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