JPH0262952U - - Google Patents
Info
- Publication number
- JPH0262952U JPH0262952U JP14137988U JP14137988U JPH0262952U JP H0262952 U JPH0262952 U JP H0262952U JP 14137988 U JP14137988 U JP 14137988U JP 14137988 U JP14137988 U JP 14137988U JP H0262952 U JPH0262952 U JP H0262952U
- Authority
- JP
- Japan
- Prior art keywords
- boom
- bucket
- valve
- cylinder
- lowering speed
- 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
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000008602 contraction Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Description
第１図はこの考案にかかる油圧回路図、第２図
はホイールローダの側面図、第３図は従来技術の
油圧回路図である。
３……作業アタツチメント、４……ブーム、５
……ブームシリンダ、９……バケツト、１０……
積込み負荷、１１……ブーム切換弁、１４……ブ
ーム下げ速度規制弁、１５……開閉バルブ、１８
……絞り部付チエツク弁。
FIG. 1 is a hydraulic circuit diagram according to this invention, FIG. 2 is a side view of a wheel loader, and FIG. 3 is a hydraulic circuit diagram of the prior art. 3...Work attachment, 4...Boom, 5
...Boom cylinder, 9...Bucket, 10...
Loading load, 11...Boom switching valve, 14...Boom lowering speed regulating valve, 15...Opening/closing valve, 18
...Check valve with throttle part.
Claims (1)
に設け、クロスリンクを上記ブームに枢支し、バ
ケツトシリンダをクロスリンクの上端と車体との
間に設け、バケツトをブーム先端部に枢着し、か
つバケツトとクロスリンク下端とをバケツトリン
クを介して連結し、ブームシリンダおよびバケツ
トシリンダの伸縮作動によりバケツトを持上げま
たは傾動可能とした作業車両において、ブームシ
リンダのボトム側油室とブーム切換弁とを連通す
る油路にブーム下げ速度規制弁を設け、そのブー
ム下げ速度規制弁内には開閉バルブと絞り部付チ
エツク弁を直列に連結せしめ、常時は上記開閉バ
ルブを油路開通位置に保持可能とし、ブーム下げ
速度が作業アタツチメントおよび積込み負荷の自
重による自然落下の影響を大きく受けるときブー
ムシリンダ用ボトム側油室からの圧力信号により
上記開閉バルブを油路遮断位置に切換作動可能に
構成したことを特徴とする作業車両の油圧回路。 A boom is rotatably provided on the vehicle body by a boom cylinder, a cross link is pivotally supported on the boom, a bucket cylinder is provided between the upper end of the cross link and the vehicle body, the bucket is pivotally attached to the tip of the boom, and In a work vehicle in which the bucket and the lower end of the cross link are connected via a bucket link, and the bucket can be lifted or tilted by the expansion and contraction operations of the boom cylinder and the bucket cylinder, the bottom side oil chamber of the boom cylinder and the boom switching valve are connected to each other. A boom lowering speed regulating valve is provided in the oil passage that communicates with the boom lowering speed, and an on-off valve and a check valve with a throttle part are connected in series within the boom lowering speed regulating valve, so that the on-off valve can be maintained in the oil passage open position at all times. and when the boom lowering speed is greatly affected by natural fall due to the weight of work attachments and loaded loads, the above-mentioned opening/closing valve is configured to be operable to switch to the oil path cutoff position by a pressure signal from the bottom side oil chamber for the boom cylinder. A hydraulic circuit for a work vehicle featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14137988U JPH0262952U (en) | 1988-10-28 | 1988-10-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14137988U JPH0262952U (en) | 1988-10-28 | 1988-10-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0262952U true JPH0262952U (en) | 1990-05-10 |
Family
ID=31406383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14137988U Pending JPH0262952U (en) | 1988-10-28 | 1988-10-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0262952U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002206616A (en) * | 2001-01-12 | 2002-07-26 | Mitsubishi Precision Co Ltd | Actuator device |
| JP2009293689A (en) * | 2008-06-04 | 2009-12-17 | Aichi Corp | Free traveling device of hydraulic traveling vehicle |
-
1988
- 1988-10-28 JP JP14137988U patent/JPH0262952U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002206616A (en) * | 2001-01-12 | 2002-07-26 | Mitsubishi Precision Co Ltd | Actuator device |
| JP2009293689A (en) * | 2008-06-04 | 2009-12-17 | Aichi Corp | Free traveling device of hydraulic traveling vehicle |
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