CN203188266U - Bulldozer hydraulic system - Google Patents
Bulldozer hydraulic system Download PDFInfo
- Publication number
- CN203188266U CN203188266U CN 201320202949 CN201320202949U CN203188266U CN 203188266 U CN203188266 U CN 203188266U CN 201320202949 CN201320202949 CN 201320202949 CN 201320202949 U CN201320202949 U CN 201320202949U CN 203188266 U CN203188266 U CN 203188266U
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- China
- Prior art keywords
- oil
- gear pump
- hydraulic system
- valve
- cold start
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- Expired - Fee Related
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Abstract
The utility model relates to a bulldozer hydraulic system which comprises an oil tank, a gear pump and an oil filter. The bulldozer hydraulic system is characterized in that a cold start valve is arranged on the gear pump, and an alarm device is arranged on the oil filter. According to the bulldozer hydraulic system, due to the fact that the cold start valve is arranged on the gear pump, oil suction resistance of pump cold bulldozer start is reduced, gas etching caused by increase of the oil suction resistance of the gear pump is avoided, and the gear pump is protected. When the oil filter is blocked, unfiltered oil returns to an oil inlet of the gear pump for circulation, and safety of the hydraulic system is improved. The alarm device can give an alarm when the oil filter is blocked, a filter element can be timely replaced, the unfiltered oil is prevented from entering a main oil way, and hydraulic elements in the main oil way can be protected.
Description
Technical field
The utility model relates to a kind of hydraulic system that is applied to bulldozer.
Background technology
The hydraulic system of existing bulldozer, fluid directly enters oil filter through gear pump, speed change, tooth sector pump from rear axle box through the coarse filter oil suction, again through smart oil filter to working connection.Because the bulldozer structural limitations, the inlet line of speed change, tooth sector pump is very long and the oil suction liquid level is lower, when the winter oil temperature low excessively, when oil viscosity is excessive, oil filter two ends pressure reduction strengthens, and the safety valve in the oil filter is opened, and fluid directly removes working connection without filtering, the oil suction resistance of gear pump increases, the pump inlet port will produce stronger negative pressure, causes in the fluid gas to be separated out, and forms bubble, bubble enters into gear pump in the higher-pressure region blast, and gear pump is caused cavitation erosion.This situation is very big to the harm of pump.
The utility model content
For reducing negative pressure that the gear pump oil suction produces to the harm of pump, the present invention proposes a kind of new hydraulic system that is applied to bulldozer,
The technical solution of the utility model is: a kind of bulldozer hydraulic system, comprise fuel tank, gear pump and oil filter, and it is characterized in that, the cold start-up valve is set on the described gear pump, on the described oil filter warning device is set.
Described cold start-up valve comprises spring base, valve body, spool and spring, and spring is arranged in the spool, and spring one end is fixed on the spring base, and three oil-ins are set on the cold start-up valve, is respectively oil-in A, oil-in B and oil-in C.Oil-in A is arranged near spring base one end, and oil-in A connects the oil filter oil-out, and oil-in B is arranged at the spring base other end, and oil-in B connects the gear pump oil-out, and oil-in C is arranged at cold start-up valve bottom, and oil-in C connects the gear pump oil-in.
Its operating principle is: ratio of viscosities was bigger when hydraulic oil oil temperature was low; before and after oil filter, produce pressure reduction; the cold start-up valve is by detecting pressure reduction; when pressure reduction during greater than certain value; the cold start-up valve is opened; the fluid of pump discharge is directly got back to the inlet port of pump, and it is empty to avoid gear pump to inhale, thereby gear pump and bulldozer hydraulic system are played a protective role.Oily temperature just often if oil filter stops up, can obtain feedback by warning device on the other hand, removes to change oil filter, prevents that the fluid of filtered from entering working connection, and other elements are damaged.
Gear pump: rely on two or more gears that are sealed in the housing, the working space volume-variation that produces in the process of being meshing with each other is carried the pump of liquid.
Oil filter, the instrument of filter oil.
Cold start-up valve: when hydraulic fluid temperature is very low, by detecting oil filter two ends pressure reduction, open valve, make a part of oil get back to the inlet port of gear pump, reduce the device of oil suction resistance.
The beneficial effects of the utility model are:
1, by the cold start-up valve is set at gear pump, reduces the oil suction resistance of pump cold start, avoid gear pump to cause cavitation erosion because the oil suction resistance increases, the protection gear pump.
When 2, oil filter stopped up, the fluid of filtered returned the gear pump oil-in and circulates, and has improved the safety of hydraulic system.
3, warning device can be reported to the police when oil filter stops up, and in time renew cartridge more prevents that the fluid of filtered from entering working connection, has protected the Hydraulic Elements in the working connection.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the prior art constructions schematic diagram;
Fig. 3 is the structural representation of cold start-up valve in the utility model.
Wherein, 1, fuel tank; 2, gear pump; 3, oil filter; 4, cold start-up valve; 5, safety valve; 6, spring base; 7, valve body; 8, spool; 9, spring; 10, oil-in A; 11, oil-in B; 12, oil-in C.
The specific embodiment
Specify the utility model below in conjunction with accompanying drawing.
As shown in Figure 1, the utility model comprises fuel tank 1, gear pump 2 and oil filter 3, and cold start-up valve 4 is set on the gear pump 2, on the oil filter 3 warning device is set.
Its operating principle is: ratio of viscosities was bigger when hydraulic oil oil temperature was low; produce pressure reduction in oil filter 3 front and back; cold start-up valve 4 is by detecting pressure reduction; when pressure reduction during greater than certain value; cold start-up valve 4 is opened; the fluid of gear pump 2 outlets is directly got back to inlet port, and it is empty to avoid gear pump 2 to inhale, thereby gear pump 2 and bulldozer hydraulic system are played a protective role.Oily temperature just often if oil filter 3 stops up, can obtain feedback by warning device on the other hand, removes to change oil filter 3, prevents that the fluid of filtered from entering working connection, and other elements are damaged.
Referring to Fig. 3, cold start-up valve 4 comprises spring base 6, valve body 7, spool 8 and spring 9, and spring 9 is arranged in the spool 8, and spring 9 one ends are fixed on the spring base 6, and three oil-ins are set on the cold start-up valve, is respectively oil-in A10, oil-in B11 and oil-in C12.Oil-in A10 is arranged near spring base 6 one ends, oil-in A10 connects the oil filter oil-out, and oil-in B11 is arranged at spring base 6 other ends, and oil-in B11 connects the gear pump oil-out, oil-in C12 is arranged at cold start-up valve 4 bottoms, and oil-in C12 connects the gear pump oil-in.The cold start-up valve is in normally off.Fluid is from fuel tank 1 to gear pump 2; arrive working connection through oil filter 3; the oil temperature is crossed when hanging down; oil viscosity increases, and oil filter 3 two ends pressure reduction increase, and the spool 8 of cold start-up valve moves to spring base 6 directions; valve open; part fluid flows back to oil-in C12 from oil-in B11, has reduced the oil suction resistance of gear pump, thus the protection pump.If oil filter stops up, then warning device can be reported to the police at once, and the fluid of filtered can not flow to working connection, has protected the Hydraulic Elements of working connection.
Claims (3)
1. a bulldozer hydraulic system comprises fuel tank (1), gear pump (2) and oil filter (3), it is characterized in that, cold start-up valve (4) is set on the described gear pump (2).
2. bulldozer hydraulic system according to claim 1 is characterized in that, described oil filter arranges warning device on (3).
3. bulldozer hydraulic system according to claim 1, it is characterized in that, described cold start-up valve (4) comprises spring base (6), valve body (7), spool (8) and spring (9), spring (9) is arranged in the spool (8), spring (9) one ends are fixed on the spring base (6), three oil-ins are set on the cold start-up valve (4), are respectively oil-in A (10), oil-in B (11) and oil-in C (12); Oil-in A (10) is arranged near spring base (6) one ends, oil-in A (10) connects the oil filter oil-out, oil-in B (11) is arranged at spring base (6) other end, oil-in B (11) connects the gear pump oil-out, oil-in C (12) is arranged at cold start-up valve (4) bottom, and oil-in C (12) connects the gear pump oil-in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320202949 CN203188266U (en) | 2013-04-19 | 2013-04-19 | Bulldozer hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320202949 CN203188266U (en) | 2013-04-19 | 2013-04-19 | Bulldozer hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203188266U true CN203188266U (en) | 2013-09-11 |
Family
ID=49105135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320202949 Expired - Fee Related CN203188266U (en) | 2013-04-19 | 2013-04-19 | Bulldozer hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203188266U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762582A (en) * | 2016-12-15 | 2017-05-31 | 中船重工重庆液压机电有限公司 | A kind of low temperature plunger displacement pump and its startup control system |
| CN107339289A (en) * | 2017-08-15 | 2017-11-10 | 杭州力龙液压有限公司 | Anti- for hydraulic power unit is emptied device and hydraulic power pack |
-
2013
- 2013-04-19 CN CN 201320202949 patent/CN203188266U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762582A (en) * | 2016-12-15 | 2017-05-31 | 中船重工重庆液压机电有限公司 | A kind of low temperature plunger displacement pump and its startup control system |
| CN107339289A (en) * | 2017-08-15 | 2017-11-10 | 杭州力龙液压有限公司 | Anti- for hydraulic power unit is emptied device and hydraulic power pack |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 |