JPH0313362U - - Google Patents
Info
- Publication number
- JPH0313362U JPH0313362U JP1989072522U JP7252289U JPH0313362U JP H0313362 U JPH0313362 U JP H0313362U JP 1989072522 U JP1989072522 U JP 1989072522U JP 7252289 U JP7252289 U JP 7252289U JP H0313362 U JPH0313362 U JP H0313362U
- Authority
- JP
- Japan
- Prior art keywords
- oil passage
- switching valve
- speed
- speed motor
- flow side
- 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
- 238000009412 basement excavation Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Operation Control Of Excavators (AREA)
- Motor Power Transmission Devices (AREA)
- Control Of Fluid Gearings (AREA)
Description
第１図はこの考案にかかる走行油圧回路図、第
２図はホイールローダ側面図、第３図はバケツト
操作時のけん引力−掘起し力線図、第４図は従来
技術の走行油圧回路図である。
９，９′……主回路、１０……可変ポンプ、１
１，１６……レギユレータ、１５……２速モータ
、１７，４１……パイロツト切換弁、１８……１
・２速切換弁、２５……前進流れ側油路、２６…
…後進流れ側油路、２８……１・２速切換スイツ
チ、４３……作動回路、４５……掘削時用切換弁
、４７……スイツチ、ワ……２速用連通油路位置
。
Figure 1 is a traveling hydraulic circuit diagram according to this invention, Figure 2 is a side view of a wheel loader, Figure 3 is a traction force-excavation force diagram during bucket operation, and Figure 4 is a traveling hydraulic circuit of the conventional technology. It is a diagram. 9,9'...Main circuit, 10...Variable pump, 1
1, 16... Regulator, 15... 2-speed motor, 17, 41... Pilot switching valve, 18... 1
・Two-speed switching valve, 25...Forward flow side oil passage, 26...
...Reverse flow side oil passage, 28...1/2 speed changeover switch, 43...operating circuit, 45...switching valve for excavation, 47...switch, wa...2nd speed communication oil passage position.
Claims (1)
り駆動される走行用２速モータと、上記可変ポン
プから２速モータに圧油を供給する前進流れ側油
路と、２速モータから可変ポンプに圧油を戻すた
めの後進流れ側油路とから主回路が構成され、か
つ１・２速切換スイツチにより２速モータを１速
・２速に切換可能とし、さらに上記前進流れ側油
路内圧力が上昇したときパイロツト切換弁の切換
作動により２速モータを２速より１速に切換える
ようにした走行油圧回路において、上記パイロツ
ト切換弁に前進流れ側油路と、２速モータ用レギ
ユレータの小容量側ポートとを連通できる２速用
連通油路位置を設け、一方、上記パイロツト切換
弁のパイロツト圧受圧部と、作業機用油圧アクチ
ユエータの作動回路とを連通する油路に掘削時用
切換弁を介設し、その掘削時用切換弁を操作した
ときの作業機用油圧アクチユエータに作用する作
動圧の信号によりパイロツト切換弁を上記２速用
連通油路位置に切換えるように構成したことを特
徴とする作業車両の走行油圧回路。 A variable pump, a 2-speed motor for traveling driven by pressure oil from the variable pump, a forward flow side oil passage that supplies pressure oil from the variable pump to the 2-speed motor, and a forward flow side oil passage that supplies pressure oil from the 2-speed motor to the variable pump. The main circuit consists of a backward flow side oil passage for returning oil, and a 1/2 speed changeover switch enables the 2-speed motor to be switched between 1st and 2nd speeds, and the pressure inside the forward flow side oil passage is In a traveling hydraulic circuit that switches the 2-speed motor from 2nd speed to 1st speed by switching the pilot switching valve when the vehicle ascends, the pilot switching valve has a forward flow side oil passage and a small capacity side of the 2-speed motor regulator. A communication oil passage for 2nd speed is provided to communicate with the port, and an excavation switching valve is provided in the oil passage that communicates the pilot pressure receiving part of the pilot switching valve with the operating circuit of the hydraulic actuator for the work equipment. The pilot switching valve is configured to switch the pilot switching valve to the second-speed communication oil passage position in response to a signal of the operating pressure acting on the hydraulic actuator for the working machine when the excavation switching valve is operated. Travel hydraulic circuit for work vehicles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989072522U JPH0730775Y2 (en) | 1989-06-20 | 1989-06-20 | Running hydraulic circuit of work vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989072522U JPH0730775Y2 (en) | 1989-06-20 | 1989-06-20 | Running hydraulic circuit of work vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0313362U true JPH0313362U (en) | 1991-02-12 |
| JPH0730775Y2 JPH0730775Y2 (en) | 1995-07-19 |
Family
ID=31610529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989072522U Expired - Lifetime JPH0730775Y2 (en) | 1989-06-20 | 1989-06-20 | Running hydraulic circuit of work vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0730775Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008082537A (en) * | 2006-08-30 | 2008-04-10 | Kobelco Cranes Co Ltd | Hydraulic travel drive device |
| JP2009522182A (en) * | 2006-01-03 | 2009-06-11 | シーエスピー テクノロジーズ，インコーポレイティド | Method and product for embedding a plurality of plugs in a plastic multi-compartment housing |
-
1989
- 1989-06-20 JP JP1989072522U patent/JPH0730775Y2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009522182A (en) * | 2006-01-03 | 2009-06-11 | シーエスピー テクノロジーズ，インコーポレイティド | Method and product for embedding a plurality of plugs in a plastic multi-compartment housing |
| JP2008082537A (en) * | 2006-08-30 | 2008-04-10 | Kobelco Cranes Co Ltd | Hydraulic travel drive device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0730775Y2 (en) | 1995-07-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR910001545B1 (en) | Hydraulic control circuit for working vehicles with transmission means for hydraulic operation | |
| US6609368B2 (en) | Automatic downshift and override control for a transmission | |
| JPH0270056U (en) | ||
| JP2804857B2 (en) | Track-type traveling device driven by hydraulic | |
| JPH0441559U (en) | ||
| JPH065934Y2 (en) | Parking brake operation part of work vehicle | |
| JPH0317468U (en) | ||
| JPH0379464A (en) | Brake structure of work vehicle | |
| JPH0312659U (en) | ||
| JPS6343260Y2 (en) | ||
| JPH0369751U (en) | ||
| JPH0976782A (en) | Auxiliary shift operating device for work vehicle | |
| JPS6321446Y2 (en) | ||
| JPH023535A (en) | Running hydraulic circuit for construction machine | |
| JPH0730775Y2 (en) | Running hydraulic circuit of work vehicle | |
| JPH01150653U (en) | ||
| JPH01174225U (en) | ||
| JPH0313230U (en) | ||
| JPH0618820Y2 (en) | Running hydraulic circuit of wheel type construction machine | |
| JPH0410291Y2 (en) | ||
| JPH0342430U (en) | ||
| JPH0527156U (en) | Hydraulic traveling device | |
| JPH01150654U (en) | ||
| JPH082031Y2 (en) | Hydraulic drive system for work vehicle | |
| JPH0190866U (en) |