JPH0318704U - - Google Patents
Info
- Publication number
- JPH0318704U JPH0318704U JP8017489U JP8017489U JPH0318704U JP H0318704 U JPH0318704 U JP H0318704U JP 8017489 U JP8017489 U JP 8017489U JP 8017489 U JP8017489 U JP 8017489U JP H0318704 U JPH0318704 U JP H0318704U
- Authority
- JP
- Japan
- Prior art keywords
- main spool
- lowered position
- spool
- back chamber
- oil
- 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
- 230000007935 neutral effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims 3
- 239000010720 hydraulic oil Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Lifting Devices For Agricultural Implements (AREA)
Description
第１図は本考案の油圧制御バルブＶの油圧回路
図、第２図は同じく展開断面図、第３図はメイン
スプール７と下げチエツク弁８とダンパースプー
ル１の部分の展開断面図、第４図はメインスプー
ル７の上げ位置から中立位置手前までの間におけ
る下げチエツク弁８とダンパースプール１の状態
を示す断面図、第５図はメインスプール７が下降
位置に至つた後のダンパースプール１の位置を示
す断面図、第６図はダンパースプール１の付設さ
れていない従来のバルブによる圧力変化を示す図
面、第７図は本考案のダンパースプール１を付設
したバルブの圧力変化を示す図面である。
１……ダンパースプール、２……ダンパー付勢
バネ、３……ダンパースプールプツシユピン、７
……メインスプール、２０……小孔、２１……ラ
ンド部。
Fig. 1 is a hydraulic circuit diagram of the hydraulic control valve V of the present invention, Fig. 2 is an exploded sectional view of the same, Fig. 3 is an exploded sectional view of the main spool 7, lower check valve 8, and damper spool 1, and Fig. 4 is an exploded sectional view of the main spool 7, lower check valve 8, and damper spool 1. The figure is a sectional view showing the state of the lowering check valve 8 and the damper spool 1 from the raised position of the main spool 7 to just before the neutral position, and Figure 5 shows the state of the damper spool 1 after the main spool 7 has reached the lowered position. A sectional view showing the position, FIG. 6 is a drawing showing a pressure change due to a conventional valve without the damper spool 1 attached, and FIG. 7 is a drawing showing a pressure change due to a valve attached with the damper spool 1 of the present invention. . 1... Damper spool, 2... Damper biasing spring, 3... Damper spool push pin, 7
...Main spool, 20...Small hole, 21...Land part.
Claims (1)
可能なメインスプール７において、下げ位置方向
に付勢バネ１０を付勢し、メインスプール７に連
動してプツシユピン１４の接当押圧により開放し
油圧シリンダーＳ内の圧油をドレーン回路に抜く
下げチエツク弁８を設け、メインスプール７に連
動して、メインスプール７の下げ方向とは逆方向
に抗力を発生させる背室Ａと、メインスプール７
が上げ位置の時に作動油が前記背室Ａに流入し、
中立位置手前から下げ位置に至るまで油の出入り
を阻止するランド部２１を形成し、下げ位置にな
ると同時に背室Ａ内の圧油を排出する小孔２０を
設けたダンパースプール１を介装したことを特徴
とするトラクターの油圧制御バルブ機構。 In the main spool 7, which can be switched to three positions: a raised position, a neutral position, and a lowered position, a biasing spring 10 is urged in the direction of the lowered position, and the main spool 7 is released by contacting and pressing the push pin 14 to release the hydraulic pressure. A lowering check valve 8 is provided to drain the pressure oil in the cylinder S to the drain circuit, and a back chamber A is provided which generates a drag force in the opposite direction to the lowering direction of the main spool 7 in conjunction with the main spool 7.
When the is in the raised position, hydraulic oil flows into the back chamber A,
A damper spool 1 is interposed, which has a land portion 21 that prevents oil from entering and exiting from just before the neutral position to the lowered position, and has a small hole 20 that discharges the pressure oil in the back chamber A at the same time as the lowered position is reached. A tractor hydraulic control valve mechanism characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8017489U JPH0739372Y2 (en) | 1989-07-07 | 1989-07-07 | Hydraulic control valve mechanism of tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8017489U JPH0739372Y2 (en) | 1989-07-07 | 1989-07-07 | Hydraulic control valve mechanism of tractor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0318704U true JPH0318704U (en) | 1991-02-25 |
| JPH0739372Y2 JPH0739372Y2 (en) | 1995-09-13 |
Family
ID=31624993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8017489U Expired - Lifetime JPH0739372Y2 (en) | 1989-07-07 | 1989-07-07 | Hydraulic control valve mechanism of tractor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0739372Y2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008137560A (en) * | 2006-12-05 | 2008-06-19 | Takehisa Kimura | Screen door for vehicle |
| CN115263830A (en) * | 2022-07-29 | 2022-11-01 | 徐州徐工农业装备科技有限公司 | Active vibration reduction control method for tractor electro-hydraulic lifting system |
| CN115263830B (en) * | 2022-07-29 | 2024-05-24 | 徐州徐工农业装备科技有限公司 | Active vibration reduction control method for tractor electro-hydraulic lifting system |
-
1989
- 1989-07-07 JP JP8017489U patent/JPH0739372Y2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008137560A (en) * | 2006-12-05 | 2008-06-19 | Takehisa Kimura | Screen door for vehicle |
| CN115263830A (en) * | 2022-07-29 | 2022-11-01 | 徐州徐工农业装备科技有限公司 | Active vibration reduction control method for tractor electro-hydraulic lifting system |
| CN115263830B (en) * | 2022-07-29 | 2024-05-24 | 徐州徐工农业装备科技有限公司 | Active vibration reduction control method for tractor electro-hydraulic lifting system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0739372Y2 (en) | 1995-09-13 |