CN101749295A - Pressure regulating system and method for working machine - Google Patents
Pressure regulating system and method for working machine Download PDFInfo
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- CN101749295A CN101749295A CN200810183781A CN200810183781A CN101749295A CN 101749295 A CN101749295 A CN 101749295A CN 200810183781 A CN200810183781 A CN 200810183781A CN 200810183781 A CN200810183781 A CN 200810183781A CN 101749295 A CN101749295 A CN 101749295A
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Abstract
The invention provides a pressure regulating system for a working machine, comprising an oil tank in response to operation of a control valve, an actuating mechanism which does actuating actions, a first pressure regulating valve and a second pressure regulating valve, wherein fluid flows through the first pressure regulating valve and is output to the actuating mechanism from the oil tank, the second regulating valve and the first pressure regulating valve are connected by the fluid, and pressure buffer is carried out on the fluid which flows to the second pressure regulating valve, thus enabling the pressure of the fluid which is output to the actuating mechanism to be increased stably. The invention also provides a pressure regulating method for the working machine, comprising the following steps: a part of the fluid which flows through the first pressure regulating valve from the oil tank is output to the actuating mechanism of the working machine; a part of the fluid which flows through the first pressure regulating valve is output to the second pressure regulating valve which is connected with the first pressure regulating valve by the fluid, wherein pressure buffer is carried out on the fluid which flows to the second pressure regulating valve, thus enabling the pressure of the fluid which is output to the actuating mechanism to be increased stably and avoiding pressure shock.
Description
Technical field
The present invention relates to a kind of pressure regulating system, be specifically related to a kind of pressure regulating system of work mechanism, the invention further relates to the pressure regulating method of this work mechanism.
Background technique
The actuator of work mechanism, for example steering equipment and speed changer have the hydraulic system that links with it usually to realize various controls and operation.For example the hydraulic system of speed changer is except providing the working hydraulic pressure with different pressures to gear shift executive component such as clutch and break, also the joint that hydraulic oil is provided and controls lock-up clutch to torque-converters with separate, and the rotary component of speed changer inside is lubricated and cools off.And in the working procedure of speed changer, different parts needed hydraulic pressure under same operating mode is different, and same position required hydraulic pressure under different operating modes also is different.For example, if oil pressure is too high, can causes serious shifting shock even damage control system; Oil pressure is crossed to hang down and then can be caused the gear shift executive component to skid, and aggravates the wearing and tearing of each friction plate, even gear-changing component is burnt.Therefore, the oil pressure and the flow that require to offer each several part can be regulated, and this just needs pressure regulating system.Because the required berth-changing strength difference of different transforming gears, therefore, effectively being provided with the assurance of the shifted quality of speed changer of pressure regulating system is extremely important.For example in the shifted process of vehicle, require gearshift procedure as far as possible promptly to finish, thereby avoid causing the wearing and tearing increase of friction element and loss of velocity to increase owing to shift time is long; In addition, also require gearshift procedure steady as far as possible, the shifting shock that the rapid change of minimizing control hydraulic pressure and the transformation of kinetic friction and static friction cause.Particularly shifting shock not only influences the stability of gear-change operation, and can reduce driver and passenger's travelling comfort, also the supply of hydraulic pressure and other corollary equipments such as the gear shift executive component of machine is all had higher requirement.In addition, the rapid change of this hydraulic pressure is easy to the speed changer of machine and fluid pressure supply system are caused damage, therefore must suitably control the hydraulic pressure in hydraulic control, the particularly shifted process.
At present, in the hydraulic actuating unit of in various vehicles and construction machine, using, usually adopt with oil pump that motor links to each other after be provided with pressure regulator under coming different operating modes required hydraulic pressure regulate.For example the working hydraulic pressure oil by modulating valve enters shift valve, accumulator is set between the clutch of shift valve and each gear actuator such as each gear comes gearshift procedure hydraulic pressure jumpy is alleviated.Be arranged in parallel by accumulator and gear-shifting actuating mechanism, when hydraulic oil enters the piston cavity of clutch, the hydraulic oil in the main line partly is fed in the accumulator stores, slow down the quick growth of working pressure; And when clutch breaks away from, by draining passage quick pressure releasing.Thereby absorb and the pressure surge of the oil pressure of carrying gently by accumulator, avoid motor too high load and shifting shock.
Although this set can be regulated hydraulic pressure, help to reduce shifting shock, but still be not optimal.For example, this mode need be provided with accumulator respectively at each gear, and a plurality of accumulators promptly are set, and has caused the increase of cost thus.In addition, in concrete layout, because the factors such as length that all need to consider pipeline respectively for each accumulator regulate, so the situation of regulating hydraulic pressure for a plurality of accumulators of this needs, it is complicated more that required operation becomes.
Summary of the invention
In order to overcome above-mentioned defective, the invention provides a kind of pressure regulating system that is used for work mechanism and method, especially for speed changer is carried out pressure controlled system and method, not only can eliminate needs thus to a plurality of accumulators, thereby reduce cost, simplified system, and be applicable to the action need of gear shift more, improve property of automatic shft.
In one aspect, the invention provides a kind of pressure regulating system, comprising: fuel tank; Actuator, this actuator carries out action in response to the operation of control valve; First pressure regulator valve, wherein fluid is delivered to actuator via first pressure regulator valve from fuel tank; With second pressure regulator valve, described second modulating valve is connected with the first pressure regulator valve fluid, wherein the fluid that flows to second pressure regulator valve is carried out pressure buffer, steadily increases so that be delivered to the hydrodynamic pressure of actuator.
In one embodiment, described control valve is switching valve and/or shift valve.
Preferably, described actuator is a gear, and this gear comprises shift valve group and clutch.
In one embodiment, second pressure regulator valve includes the valve body of second valve body and the 3rd valve body, and second spool is set in second valve body slidably, in the 3rd valve body spring is set, and described second valve body fluid connects control valve.
In one embodiment, first pressure regulator valve comprises first valve body and first spool, and described first valve body connects described the 3rd valve body, and described first spool is slidingly arranged in described first valve body, and first valve body connects described the 3rd valve body.
In one embodiment, first pressure regulator valve and control valve are connected to form first stream, are provided with the first segment discharge orifice in described first stream.
In one embodiment, first pressure regulator valve and described control valve are connected to form first stream, second modulating valve and control valve are connected to form second stream, also comprise the 3rd stream, described the 3rd stream is connected with the described second modulating valve fluid and is in parallel with second stream, in described the 3rd stream second throttle orifice is set, the one-way valve that stops direction of flow second modulating valve is set in described second stream.
In one embodiment, be connected with first stream again after second stream and the 3rd stream parallel connection.
In one embodiment, be connected with first stream near the control valve place after second stream and the 3rd stream parallel connection.
In one embodiment, first pressure regulator valve and second pressure regulator valve are integrally formed.
Another aspect of the present invention provides a kind of pressure regulating method of work mechanism, and this method comprises: will be delivered to the actuator of work mechanism from the flow through segment fluid flow of first pressure regulator valve of fuel tank; The segment fluid flow of first pressure regulator valve of flowing through is delivered to second pressure regulator valve that is connected with the first pressure regulator valve fluid, wherein the fluid that flows to second pressure regulator valve is carried out pressure buffer, steadily increase so that be delivered to the hydrodynamic pressure of actuator.
According to pressure regulating system of the present invention and method, setting by first pressure regulator valve and second pressure regulator valve, can realize the required oil pressure of different gears being regulated in response to gear-change operation, thereby substituted a plurality of accumulators that are provided with respectively at different gears in the conventional construction, realized simultaneously avoiding shifting shock and simplified structure, reducing cost.By one-way valve and the throttle orifice that is arranged in parallel, the circulation area difference of hydraulic pressure stream both can be alleviated shifting shock when utilizing different pressure to regulate, and can realize the quick disengaging of friction element again, avoided having an accident.
Description of drawings
Illustrated embodiment describes pressure regulating system of the present invention and method in detail with reference to the accompanying drawings, wherein shown in accompanying drawing in, identical reference character is represented identical parts.
Fig. 1 shows the schematic representation according to the pressure regulating system of one embodiment of the present invention;
Fig. 2 shows the schematic representation according to the pressure regulating system of another embodiment of the invention;
Fig. 3 shows the pressure history of the actuator that adopts pressure regulating system of the present invention.
Embodiment
Pressure regulating system of the present invention and method can be applied to the work mechanism of various hydraulic controls.For illustrative purposes, the gear with loader is described in the present embodiment.Those skilled in the art will appreciate that described work mechanism can be the work mechanism of any kind of, for example in the other machines in loader, excavator or the building industry or other industry such as the agricultural, forestry other machinery.Gear can comprise the clutch of different gears and selectively engage shift valve group such as speed change distributing valve group such as each gear of neutral gear, reverse gear, forward gears with control output speed of speed changer and direction with clutch.For example, the shift valve group can comprise direction shift valve, high and low shift shift valve and the brake valve that connects forward gears, backward gear, those skilled in the art will appreciate that the shift valve group can also comprise more or less gear.
Referring now to Fig. 1 pressure regulating system of the present invention is described.Hydraulic oil is delivered to first pressure regulator valve 21 from fuel tank 11 by oil pump 4.Part hydraulic oil flows to shift valve group 1 through first segment discharge orifice 311, and further flow to clutch 12 via shift valve group 1, another part hydraulic oil flows to second pressure regulator valve 22 through second throttle orifice 321, second pressure regulator valve carries out pressure buffer to the hydraulic oil that flows to wherein, because second pressure regulator valve 22 is connected with shift valve group 1 and clutch 12 fluids, the pressure that therefore flow to the hydraulic oil of shift valve group 1 and clutch 12 steadily increases under the buffer function of second pressure regulator valve 22.Also have part hydraulic oil to flow to torque-converters 7 by first pressure regulator valve 21.And when pressure surpassed predetermined value, part hydraulic oil was back to fuel tank 5 from first pressure regulator valve 21.Wherein, fuel tank 5 and fuel tank 11 can be the different pieces of a fuel tank of fluid connection.
Further as shown in Figure 1, pressure regulator valve 20 comprises first pressure regulator valve 21 and second pressure regulator valve 22.First pressure regulator valve 21 and second pressure regulator valve 22 are integrally formed, promptly are combined in the valve body.First pressure regulator valve 21 comprises that first spool 212 and first valve body, 213, the second pressure regulator valves 22 comprise being mounted slidably in second spool, 224, the three valve bodies 223 in second valve body 222 and the 3rd valve body 223, the second valve bodies 222 spring 225 is set.In this embodiment, first pressure regulator valve 21 combines with oil pump 4 and will be adjusted to stress level or the pressure range that gear to be changed needs from the oil pressure of the hydraulic oil of fuel tank 11.22 pairs of above-mentioned hydraulic fluid pressures that are transported to actuator of second pressure regulator valve cushion, and the hydraulic fluid pressure of regulating via first pressure regulator valve 21 is steadily increased in the gear shift pressurization.Wherein first pressure regulator valve 21 is connected to form in first stream, 31, the first streams with shift valve group 1 and is provided with first segment discharge orifice 311.Second modulating valve 22 and shift valve group 1 are connected to form second stream, 32, the three streams 33 and draw and in parallel with second stream 32 from second modulating valve 22, and second stream 32 and 33 in parallel then connections with first stream 31 of the 3rd stream are communicated to shift valve group 1 then.Wherein be provided with one-way valve 322 in second stream 32, this one-way valve 322 allows hydraulic oil to flow to shift valve group 1 from second pressure regulator valve 22, but stops the hydraulic oil reverse flow.Second throttle orifice 331 is set in the 3rd stream 33.
As shown in Figure 1, during the gear shift supercharging, hydraulic oil from fuel tank 11 is delivered to first pressure regulator valve 21 through oil pump 4, a part is supplied to shift valve group 1 as working hydraulic pressure oil through first stream 31 after being specially first valve body 213 on pressure regulator valve integrally formed among Fig. 1 20 right sides and first segment discharge orifice 311, and is delivered directly to clutch 12 by shift valve group 1 and carries out gear-change operation as what show among the figure.Simultaneously, another part hydraulic oil flow is to second pressure regulator valve 22, owing to be provided with the one-way valve 322 that blocking-up flows to second pressure regulator valve 22 in second stream 32, hydraulic oil only flows to second pressure regulator valve 22 by second throttle orifice 331 in the 3rd stream.Also have part hydraulic oil to regulate back guiding torque-converters 7 by first pressure regulator valve 21.Wherein first pressure regulator valve 21 can adopt different valve bodies and valve core structure, realizing the break-make of different streams as required, and is not limited to above-mentioned flow passage structure.
Because the oil pressure of second valve body 222 that enters second pressure regulator valve 22 is greater than the elastic force of spring 225, therefore hydraulic oil is oppressed second spool 224 and is moved right and then compress spring 225 in the 3rd valve body 223 until reaching state of equilibrium, at this moment, part hydraulic oil is stored in second valve body 222.Thus, when connecting new gear clutch,, promptly reach suitable pressure through a buffering course because the buffering of the spring 225 in second modulating valve 22 increases the oil pressure that activates clutch gently.
Correspondingly, when the gear shift pressure release, the gear of joint breaks away from, and the hydraulic oil of clutch is through the draining passage quick pressure releasing of this gear correspondence, and the pressure of first stream 31 is descended rapidly.At this moment, one-way valve 322 is opened, under the promotion of spring 225 elastic force, be stored in hydraulic oil in second valve body 222 through one-way valve 322 and the 32 rapid pressure releases of second stream to fuel tank 5, pressure leak process is carried out fast, clutch separates fast.
Because being arranged in parallel of the one-way valve 322 and second throttle orifice 331, in boosting of causing by gear-change operation and pressure leak process, can control and adjust the hydraulic oil speed that flows into and flow out second pressure regulator valve 22, thereby further realize buffer function gear shift.
Fig. 2 shows the pressure regulating system according to another embodiment of the invention.This mode of execution is with the different of aforementioned embodiments, at first second stream 32 and the 3rd stream 33 that will be formed by the one-way valve 322 and second throttle orifice 331 respectively is connected in parallel, be connected on first stream 31 up to a side place then near shift valve group 1, thereby compare with aforementioned embodiments, can change speed of response for variation in pressure by the length that changes fluid line.
Industrial applicibility
Pressure regulating system of the present invention can be applied in the work mechanism of various types of actuators that have a hydraulic actuating in the different industries.This pressure regulating system comprises fuel tank, carries out the actuator of action, first pressure regulator valve and second pressure regulator valve that fluid connects in response to the operation of control valve.Wherein fluid is delivered to actuator via first pressure regulator valve from fuel tank, and second pressure regulator valve cushions the hydrodynamic pressure that is delivered to actuator then, and the hydrodynamic pressure that is delivered to actuator is steadily increased.According to preferred design of the present invention, steadily increase in order to make hydrodynamic pressure, can partly store in second pressure regulator valve 22 by the hydraulic oil after will regulating through first pressure regulator valve 21 and realize.
The working procedure of the gear with pressure regulating system of the present invention is described now in conjunction with the accompanying drawings.
When the gear shift supercharging, hydraulic oil from fuel tank 11 is delivered to first pressure regulator valve 21 through oil pump 4, it is first spool 212 in first valve body 213 on pressure regulator valve 20 right sides integrally formed among Fig. 1 and Fig. 2, after 21 adjustings of first pressure regulator valve, part hydraulic oil is supplied to shift valve group 1 via first stream 31 and first segment discharge orifice 311, flow into second valve body 222 of second pressure regulator valve 22 via another part hydraulic oil of first modulating valve 21 and first segment discharge orifice 311 second throttle orifice 331 in the 3rd stream 33, oppress second spool 224 and move right and then compress spring 225 in the 3rd valve body 223 until reaching state of equilibrium.Through said process, when connecting new gear, by making twice adjusting of oil pressure that oil pump 4 provides through first modulating valve 21 and second modulating valve 22, thus make the oil pressure that activates clutch through one stably buffering course reach the required convenient pressure of this gear, relaxed shifting shock.
Correspondingly, when cut-off clutch, when promptly shift valve group 1 needed pressure release, hydraulic oil descended the pressure of first stream 31 rapidly through the draining passage quick pressure releasing of this gear correspondence.At this moment, because there is positive differential pressure in one-way valve 322 both sides, one-way valve opens, under the promotion of spring 225 elastic force, the hydraulic oil that is stored in second valve body 222 is discharged fast through one-way valve 322, and pressure descends rapidly, and clutch separates fast.
The gear in present embodiment, first pressure regulator valve 21 is connected with second pressure regulator valve, 22 fluids, spring 225 is changed in the contraction by hydraulic fluid pressure in second pressure regulator valve 22, give hydraulic oil one pressure buffer that is applied on first spool 212, perfect condition is that the fluid that flows to actuator steadily increases according to the force variation of spring 225 under the buffer function of spring, shown in the pressure history among Fig. 3 100.Certainly owing to the viscous resistance of hydraulic oil and the many-sided reasons such as flow resistance in pipeline, actual pressure history can be not in full accord with perfect condition 100, but approaching with perfect condition, steadily increases.Because first stream 31 and second stream 32 are communicated with, the hydrodynamic pressure that therefore puts on second spool 224 equates that with the pressure that is applied on the shift valve group 1 therefore the pressure that is applied on the shift valve group 1 also steadily increases according to the elasticity change curve of spring 225.After pressure is increased to predetermined value, be applied to the pressure of first pressure regulator valve 21 and the variation in pressure between the spring force by hydraulic oil, cause first spool 212 in first valve body 213, to move, control the break-make of first stream 31 and second stream 32, the pressure that keeps being applied to actuator is in stable suitable pressure range all the time, shown in 200 among Fig. 3.Certainly, shown in 200 also is situation under the optimal state, and the pressure that promptly is supplied to actuator is a definite value, but in fact the fuel feeding of oil pump 4 is still a dynamic process, and therefore, the pressure that is supplied to actuator fluctuates a fixed value.
It should be noted that, although The present invention be directed to and being applied to actuator is that the mode of execution of speed changer is described, but the present invention also can be applied to the actuator of other hydraulic actuating in the work mechanism, for example, also can be used in the hydraulic steering system, at this moment, actuator is a steering equipment, and control valve is specially switching valve.Shall also be noted that the speed changer shown in the figure only shows two shift valves and corresponding clutch, but it can comprise that also more a plurality of shift valves and clutch are to realize the needs of a plurality of gears.And above description the of the present invention is exemplary and nonrestrictive, and those skilled in the art can understand according to principle of the present invention and spirit can carry out various modification, variation.Mode of execution for example only is a hyraulic controlled type, also pressure regulating system of the present invention can be applied to be equipped with in the electronic control system of a plurality of solenoid valves and various sensors and form precise electric liquid control more, perhaps adopt other valve body, as long as can realize aforesaid regulatory function with pressure regulatory function.For example illustrated again second pressure regulator valve and first pressure regulator valve are one, also can will be set as two valves of separation, and these conversion do not exceed protection scope of the present invention all within the spirit and scope of the present invention.
Reference numerals list
1 shift valve group
4 oil pumps
5,11 fuel tanks
7 torque-converters
12 clutches
20 pressure regulator valves
21 first pressure regulator valves
212 first spools
213 first valve bodies
22 second pressure regulator valves
222 second valve bodies
223 the 3rd valve bodies
224 second spools
225 springs
31 first streams
32 second streams
33 the 3rd streams
311 first segment discharge orifices
331 second throttle orifices
322 one-way valves
Claims (14)
1. the pressure regulating system of a work mechanism comprises:
Fuel tank;
Actuator, action is carried out in its operation in response to control valve;
First pressure regulator valve, wherein fluid is delivered to actuator via first pressure regulator valve from fuel tank;
Second pressure regulator valve, described second modulating valve is connected with the first pressure regulator valve fluid, wherein the fluid that flows to second pressure regulator valve is carried out pressure buffer, steadily increases so that be delivered to the hydrodynamic pressure of actuator.
2. pressure regulating system according to claim 1, wherein, described control valve is switching valve and/or shift valve.
3. pressure regulating system according to claim 1, wherein, described actuator is a gear, this gear comprises shift valve group and clutch.
4. pressure regulating system according to claim 1, wherein, described second pressure regulator valve includes the valve body of second valve body and the 3rd valve body, in described second valve body second spool is set slidably, in described the 3rd valve body spring is set, described second valve body fluid connects described control valve.
5. pressure regulating system according to claim 4, wherein, described first pressure regulator valve comprises first valve body and first spool, and described first spool is slidingly arranged in described first valve body, and described first valve body connects described the 3rd valve body.
6. pressure regulating system according to claim 1, wherein, described first pressure regulator valve and described control valve are connected to form first stream, are provided with the first segment discharge orifice in described first stream.
7. pressure regulator according to claim 1, wherein, wherein said first pressure regulator valve and described control valve are connected to form first stream, described second modulating valve and described control valve are connected to form second stream, also comprise the 3rd stream, described the 3rd stream is connected with the described second modulating valve fluid and is in parallel with second stream, in described the 3rd stream second throttle orifice is set, and the one-way valve that stops direction of flow second pressure regulator valve is set in described second stream.
8. pressure regulating system according to claim 7 wherein, is provided with the first segment discharge orifice in described first stream.
9. pressure regulating system according to claim 7 wherein, is connected with first stream after described second stream and the 3rd stream parallel connection again.
10. pressure regulating system according to claim 7 wherein, is being connected with first stream near the control valve place after described second stream and the 3rd stream parallel connection.
11. pressure regulating system according to claim 1, wherein, described first pressure regulator valve and second pressure regulator valve are integrally formed.
12. a pressure regulating method that is used for work mechanism comprises:
To be delivered to the actuator of work mechanism from the flow through segment fluid flow of first pressure regulator valve of fuel tank;
The segment fluid flow of first pressure regulator valve of flowing through is delivered to second pressure regulator valve that is connected with the first pressure regulator valve fluid, wherein the fluid that flows to second pressure regulator valve is carried out pressure buffer, steadily increase so that be delivered to the hydrodynamic pressure of actuator.
13. pressure regulating method according to claim 12, wherein, described first pressure regulator valve is connected with actuator by first stream, described second pressure regulator valve is connected with first stream by second stream, the 3rd stream of parallel connection, wherein is provided with one-way valve in second stream and stops direction of flow second pressure regulator valve.
14. pressure regulating method according to claim 13 wherein, carries out throttling by throttle orifice is set respectively in first stream and the 3rd stream.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810183781A CN101749295A (en) | 2008-12-18 | 2008-12-18 | Pressure regulating system and method for working machine |
| RU2009146981/28A RU2520958C2 (en) | 2008-12-18 | 2009-12-17 | System and method for pressure control in working assemblies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810183781A CN101749295A (en) | 2008-12-18 | 2008-12-18 | Pressure regulating system and method for working machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101749295A true CN101749295A (en) | 2010-06-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810183781A Pending CN101749295A (en) | 2008-12-18 | 2008-12-18 | Pressure regulating system and method for working machine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101749295A (en) |
| RU (1) | RU2520958C2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108626270A (en) * | 2017-03-22 | 2018-10-09 | 徐工集团工程机械股份有限公司 | Hydraulic control system, control method and construction machinery gear box |
| CN109838548A (en) * | 2019-04-02 | 2019-06-04 | 江苏汇智高端工程机械创新中心有限公司 | Gearbox, clutch speed-changing mechanism and engineering machinery |
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| DE3833624A1 (en) * | 1988-10-03 | 1990-04-05 | Rexroth Mannesmann Gmbh | Valve arrangement for the controlled supply of a working space with hydraulic fluid |
| GB2239913A (en) * | 1990-01-13 | 1991-07-17 | Teves Gmbh Alfred | Hydraulic brake system with braking slip and/or traction slip control |
| US5288142A (en) * | 1990-01-13 | 1994-02-22 | Alfred Teves Gmbh | Hydraulic brake system including slip control |
| CN2187679Y (en) * | 1994-05-06 | 1995-01-18 | 张赵来 | Cold stating pre-lubricating device for energy-storage engine |
| US5803867A (en) * | 1996-02-15 | 1998-09-08 | Nissan Motor Co., Ltd. | Fluid control circuit of automatic transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5822659B2 (en) * | 1979-09-13 | 1983-05-10 | アイシン ワ−ナ−株式会社 | Automatic transmission hydraulic adjustment device |
| SU1710380A1 (en) * | 1989-11-16 | 1992-02-07 | Московский автомобильный завод им.И.А.Лихачева | Device for adjusting oil pressure in hydraulic system of automatic transmission |
| JP3212651B2 (en) * | 1991-12-04 | 2001-09-25 | マツダ株式会社 | Hydraulic control circuit of hydraulically operated transmission |
| JP3050039B2 (en) * | 1994-03-17 | 2000-06-05 | 日産自動車株式会社 | Hydraulic control circuit for continuously variable transmission |
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2008
- 2008-12-18 CN CN200810183781A patent/CN101749295A/en active Pending
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2009
- 2009-12-17 RU RU2009146981/28A patent/RU2520958C2/en active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3833624A1 (en) * | 1988-10-03 | 1990-04-05 | Rexroth Mannesmann Gmbh | Valve arrangement for the controlled supply of a working space with hydraulic fluid |
| GB2239913A (en) * | 1990-01-13 | 1991-07-17 | Teves Gmbh Alfred | Hydraulic brake system with braking slip and/or traction slip control |
| US5288142A (en) * | 1990-01-13 | 1994-02-22 | Alfred Teves Gmbh | Hydraulic brake system including slip control |
| CN2187679Y (en) * | 1994-05-06 | 1995-01-18 | 张赵来 | Cold stating pre-lubricating device for energy-storage engine |
| US5803867A (en) * | 1996-02-15 | 1998-09-08 | Nissan Motor Co., Ltd. | Fluid control circuit of automatic transmission |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108626270A (en) * | 2017-03-22 | 2018-10-09 | 徐工集团工程机械股份有限公司 | Hydraulic control system, control method and construction machinery gear box |
| CN109838548A (en) * | 2019-04-02 | 2019-06-04 | 江苏汇智高端工程机械创新中心有限公司 | Gearbox, clutch speed-changing mechanism and engineering machinery |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2009146981A (en) | 2011-06-27 |
| RU2520958C2 (en) | 2014-06-27 |
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Application publication date: 20100623 |