CN203051736U - Power shift transmission operating valve with independent buffering gears - Google Patents
Power shift transmission operating valve with independent buffering gears Download PDFInfo
- Publication number
- CN203051736U CN203051736U CN 201320050031 CN201320050031U CN203051736U CN 203051736 U CN203051736 U CN 203051736U CN 201320050031 CN201320050031 CN 201320050031 CN 201320050031 U CN201320050031 U CN 201320050031U CN 203051736 U CN203051736 U CN 203051736U
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- valve
- pressure reducing
- dynamic pressure
- reducing valve
- gear shifting
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Abstract
A power shift transmission operating valve with independent buffering gears comprises a valve body, a hydraulic switch valve and a clutch. The hydraulic switch valve comprises a direction gear shifting hydraulic switch valve and a speed gear shifting hydraulic switch valve, the clutch comprises a direction gear shifting clutch and a speed gear shifting clutch, the direction gear shifting hydraulic switch valve is connected with the direction gear shifting clutch, the speed gear shifting hydraulic switch valve is connected with the speed gear shifting clutch, and buffer devices are arranged between the speed gear shifting hydraulic switch valve and the speed gear shifting clutch. The buffer devices are arranged and adaptive to time needed by gear shifting of various speed gears, and impact in a gear shifting process is effectively buffered. The power shift transmission operating valve with the independent buffering gears has the advantages that according to requirements for building pressure characteristics of various clutches, whether to carry out buffering is determined, and different pressure building characteristics can be obtained aiming at the various speed gears and different requirements of different machine types, so that the effect that all gear pressure control systems do not affect one another is achieved.
Description
Technical field
The utility model relates to the power shfit speed change control valve of a kind of speed change control valve of running mechanism power shfit, particularly a kind of each gear individual buffer.
Background technique
The current driving force gear shift is used comparatively extensive in engineering machinery transmission, what all adopt basically is that hydraulic efficiency slide valve control gearbox clutch oil circuit break-make realizes gear shift, this bang-bang control meeting to oil circuit brings bigger shifting shock, impacts the life-span that conference influences operation comfort and the component of gear shift.In order to solve the impact phenomenon in the gearshift procedure, mainly be at working connection damping device to be set, hydraulic oil cushions oil pressure before entering each gear clutch, delay its pressure building-up time, though this scheme has played the effect of buffering to a certain extent, but owing to be at the enterprising row buffering of working connection, therefore has only a buffer time, but in the actual gearshift procedure, bottom gear is because the transmission torque ratio is bigger, the required shelves time is long, it is little that high gear is transmitted moment of torsion, required shift time is short, if at working connection the requirement that trimmer valve satisfies the longer buffer time of bottom gear is set, is combination time slow " waiting shelves " phenomenon to occur in the top gear gear shift then, if satisfy the requirement preferentially satisfied top gear certainly will can bring again impact in the bottom gear gearshift procedure comparatively violent, generally can take into account the shift time of low gear and top gear, can make the shift time of bottom gear shorter than actual demand like this, cause having in the gearshift procedure and significantly impact sense; The shift time of top gear is longer than actual demand, causes gear shift to be switched, but clutch is in conjunction with the phenomenon that lags behind, and this scheme makes maneuverability variation, efficient step-down, the degradation of transmission system.
Summary of the invention
Goal of the invention: the utility model purpose provides a kind of slowing down in the engineering machinery timing and impacts, simultaneously can guarantee that by setting different parameters the bottom gear gear shift do not have impact, the power shfit speed change control valve of the gear individual buffer of top gear gear shift high efficiency smooth substantially at the different shift characteristics of high bottom gear.
Technological scheme: a kind of power shfit speed change control valve of gear individual buffer, comprise valve body, hydraulic switching valve and clutch, described hydraulic switching valve comprises direction gear shifting hydraulic switch valve and speed gear shifting hydraulic switch valve, described clutch comprises direction gear shift sleeve and speed gear shift sleeve, described direction gear shifting hydraulic switch valve is connected with the direction gear shift sleeve, described speed gear shifting hydraulic switch valve is connected with the speed gear shift sleeve, is provided with damping device between described speed gear shifting hydraulic switch valve and the speed gear shift sleeve.Adapt to each speed stage gear shift needed time damping device is set respectively, alleviated the impact in the gearshift procedure effectively.
Preference, described damping device comprises dynamic pressure reducing valve, one-way throttle valve and accumulator assembly, the oil outlet of described dynamic pressure reducing valve connects speed gear shift sleeve parallel with one another and accumulator assembly respectively, be provided with one-way throttle valve between described dynamic pressure reducing valve and the accumulator assembly, one-way throttle valve is to dynamic pressure reducing valve one side conducting; The oil outlet of described dynamic pressure reducing valve is provided with the ante-chamber that the pressure feedback oil circuit connects dynamic pressure reducing valve, is provided with between described one-way throttle valve and the accumulator assembly and feeds back the back cavity that oil circuit is connected dynamic pressure reducing valve.
Preference, described dynamic pressure reducing valve comprises plug and the pressure adjusting spring of dynamic pressure reducing valve cavity, dynamic pressure reducing valve spool, band through hole, described spool excircle is provided with circular groove, be connected by pressure adjusting spring between described dynamic pressure reducing valve spool and the valve body, the dynamic pressure reducing valve spool slides in the dynamic pressure reducing valve cavity, working connection is communicated with circular groove by oil duct A1, circular groove is communicated with the ante-chamber of dynamic pressure reducing valve by oil duct B1, circular groove is communicated with clutch simultaneously, and the slip of dynamic pressure reducing valve spool can be regulated the aperture of each oil duct; Described one-way throttle valve comprises preloading spring and one-way throttle valve core, and described one-way throttle valve core is provided with throttle orifice; By plug one-way throttle valve is fixed on the dynamic pressure reducing valve valve core inside, described preloading spring two ends connect plug and one-way throttle valve core respectively; The ante-chamber of described dynamic pressure reducing valve is communicated with the back cavity of dynamic pressure reducing valve by the plug of band through hole and the one-way throttle valve core of band throttle orifice successively; The back cavity of dynamic pressure reducing valve connects the accumulator assembly by oil duct C1.
Preference, described accumulator assembly comprises accumulation of energy chamber, energy storage piston and energy-storaging spring, and described energy storage piston and energy-storaging spring are installed on inside, accumulation of energy chamber, and described energy storage piston slides in the accumulation of energy chamber under energy-storaging spring and oil pressure effect.
Preference, the tail position of described energy storage piston are provided with the guide sleeve that energy-storaging spring is installed.The motion that has guaranteed energy-storaging spring can not depart from the center, convenient accurate Regulation spring pretightening force.
Preference is provided with damping device between described direction gear shifting hydraulic switch valve and the direction gear shift sleeve.
Working principle: the build-up pressure characteristic according to each clutch behind each hydraulic switching valve delivery pressure requires to determine whether cushion, if do not cushion then hydraulic switching valve is directly inputted into clutch, cushion if desired then that pressure exports damping device earlier to, clutch is specified in input after cushioning.After pressure oil enters damping device, by dynamic pressure reducing valve, go out 3 oil circuits of pressure oil content behind the dynamic pressure reducing valve, the 1st oil circuit directly is connected with clutch, article 2, feed back to the dynamic pressure reducing valve ante-chamber, feed back to the dynamic pressure reducing valve back cavity after the 3rd oil circuit enters one-way throttle valve.Mechanism is: along with clutch pressure raises, feed back to the dynamic pressure reducing valve ante-chamber by the 2nd oil circuit, feed back to the dynamic pressure reducing valve back cavity by the 3rd oil circuit pressure oil through behind the one-way throttle valve simultaneously, because flowing pressure reduces, the pressure sum that the pressure of dynamic pressure reducing valve ante-chamber overcomes pressure adjusting spring active force and back cavity turns down and enters clutch oil circuit opening, but the rising along with clutch pressure, opening turns down, more and more littler by the dynamic pressure reducing valve flow, pressure reduction reduces before and after causing the one-way throttle valve throttle orifice, when the pressure difference in chamber is not enough to overcome spring force before and after being reduced to dynamic pressure reducing valve, the dynamic pressure reducing valve opening reopens under the effect of spring force, continuation is to clutch charged pressure oil, pressure is further raise, the while power reduction valve that raises restarts to act on, and so circulation makes clutch pressure slowly raise, and reaches the purpose of compensator or trimmer pressure characteristic.
Damping device described in the utility model provides pressure source by the oil suction chamber that is arranged on the valve body for damping device, break-make by hydraulic switching valve pilot pressure oil, oil suction chamber is by the circular groove on the oil duct A1 connection dynamic pressure reducing valve core, the pressure communication of described circular groove is to the clutch pressure acting chamber, be communicated to the dynamic pressure reducing valve ante-chamber by oil duct B1 simultaneously, the dynamic pressure reducing valve ante-chamber is provided with one-way throttle valve and preloading spring, dynamic pressure reducing valve core back cavity is set with pressure adjusting spring, ante-chamber pressure oil can enter back cavity through one-way throttle valve, dynamic pressure reducing valve spool back cavity is connected to the ante-chamber of energy storage piston by oil duct C1, and the energy storage piston back cavity has energy-storaging spring.High pressure oil enters the circular groove of dynamic pressure reducing valve behind the hydraulic switch opening of valves, enter the ante-chamber of dynamic pressure reducing valve simultaneously and enter back cavity by one-way throttle valve, because the ante-chamber of dynamic pressure reducing valve and the back cavity pressure oil of dynamic pressure reducing valve form pressure difference promotion dynamic pressure reducing valve spool through throttle orifice and turn down the pressure hydraulic fluid port that dynamic pressure reducing valve enters clutch, make clutch pressure not set up rapidly, the spring of increase compress energy storage gradually along with energy storage piston ante-chamber pressure oil, cavity pressure raises gradually before the energy storage piston, promotion dynamic pressure reducing valve spool cavity direction forward moves, increased the opening of dynamic pressure reducing valve circular groove and valve body, pressure in the circular groove begins again to continue to increase, pressure in the circular groove promotes the dynamic pressure reducing valve spool again when increasing and moves the opening that turns down circular groove and valve body hydraulic fluid port, pass through dynamic motion repeatedly like this, thereby make clutch pressure set up slowly.Because the effect of one-way throttle valve, the fluid in clutch and accumulation of energy chamber is avoided next action gear is played interference effect through the process of one-way valve fast pressure relief in process out of supply.
Damping device can play effective control to buffer time by the parameters such as damping hole size, pressure adjusting spring, energy storage piston stroke and energy-storaging spring of regulating one-way throttle valve in the utility model, can require to obtain different pressure at the difference of each speed stage and different type of machines and set up characteristic, thereby realize that each gear control pressurer system is independent of each other.
The utility model can be changed by designing different transition valve pieces at different gearbox incoming pressure hydraulic fluid port positions and quantity, thereby realizes versatility of the present utility model.
Beneficial effect: the utility model requires to determine whether cushion according to the build-up pressure characteristic of each clutch, can require to obtain different pressure at the difference of each speed stage and different type of machines and set up characteristic, thereby realize that each gear control pressurer system is independent of each other.
Description of drawings
Fig. 1 is hydraulic schematic diagram of the present utility model;
Fig. 2 is internal structure schematic representation of the present utility model;
Fig. 3 is the surperficial oil duct schematic representation of the utility model valve body;
Fig. 4 is the situation structural representation of the utility model damping device;
Fig. 5 is the utility model transition valve piece front oil duct schematic representation.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, a kind of power shfit speed change control valve of gear individual buffer, comprise valve body 1, hydraulic switching valve 2 and clutch 3, described hydraulic switching valve 2 comprises direction gear shifting hydraulic switch valve 21 and speed gear shifting hydraulic switch valve 22, described clutch 3 comprises direction gear shift sleeve 31 and speed gear shift sleeve 32, described direction gear shifting hydraulic switch valve 21 is connected with direction gear shift sleeve 31, described speed gear shifting hydraulic switch valve 22 is connected with speed gear shift sleeve 32, is provided with damping device 4 between described speed gear shifting hydraulic switch valve 22 and the speed gear shift sleeve 32.
Described damping device 4 comprises dynamic pressure reducing valve 41, one-way throttle valve 42 and accumulator assembly 43, the oil outlet of described dynamic pressure reducing valve 41 connects speed gear shift sleeve 32 parallel with one another and accumulator assembly 43 respectively, be provided with one-way throttle valve 42 between described dynamic pressure reducing valve 41 and the accumulator assembly 43, one-way throttle valve is to dynamic pressure reducing valve 41 1 side conductings; The oil outlet of described dynamic pressure reducing valve 41 is provided with the ante-chamber that the pressure feedback oil circuit connects dynamic pressure reducing valve 41, is provided with between described one-way throttle valve 42 and the accumulator assembly 43 and feeds back the back cavity that oil circuit is connected dynamic pressure reducing valve 41.
Shown in Fig. 2 and 3, described dynamic pressure reducing valve 41 comprises dynamic pressure reducing valve cavity 411, dynamic pressure reducing valve spool 412, plug 413 and the pressure adjusting spring 414 of band through hole, described spool 412 excircles are provided with circular groove 415, be connected by pressure adjusting spring 414 between described dynamic pressure reducing valve spool 412 and the valve body 1, dynamic pressure reducing valve spool 412 slides in dynamic pressure reducing valve cavity 411, working connection is communicated with circular groove 415 by oil duct A1, circular groove 415 is communicated with the ante-chamber of dynamic pressure reducing valve 41 by oil duct B1, circular groove 415 is communicated with clutch 3 simultaneously, and the slip of dynamic pressure reducing valve spool 412 can be regulated the aperture of each oil duct; Described one-way throttle valve 42 comprises preloading spring 421 and one-way throttle valve core 422, and described one-way throttle valve core 422 is provided with throttle orifice 423; By plug 413 one-way throttle valve 42 is fixed on dynamic pressure reducing valve spool 412 inside, described preloading spring 421 two ends connect plug 413 and one-way throttle valve core 422 respectively; The ante-chamber of described dynamic pressure reducing valve 41 is communicated with the back cavity of dynamic pressure reducing valve 41 by the plug 413 of band through hole and the one-way throttle valve core 422 of band throttle orifice 423 successively; The back cavity of dynamic pressure reducing valve 41 connects accumulator assembly 43 by oil duct C1.
As shown in Figure 4, described accumulator assembly 43 comprises accumulation of energy chamber 431, energy storage piston 432 and energy-storaging spring 433, described energy storage piston 432 and energy-storaging spring 433 are installed on 431 inside, accumulation of energy chamber, and described energy storage piston 432 slides in accumulation of energy chamber 431 under energy-storaging spring 433 and oil pressure effect.The tail position of described energy storage piston 432 is provided with the guide sleeve 434 that energy-storaging spring 433 is installed.
Be provided with damping device 4 between described direction gear shifting hydraulic switch valve 21 and the direction gear shift sleeve 31.
Working principle: the build-up pressure characteristic according to each clutch 3 behind each hydraulic switching valve 2 delivery pressure requires to determine whether cushion, if do not cushion then hydraulic switching valve 2 is directly inputted into clutch 3, cushion if desired then that pressure exports damping device 4 earlier to, clutch 3 is specified in input after cushioning.After pressure oil enters damping device 4, by dynamic pressure reducing valve 41, go out three oil circuits of dynamic pressure reducing valve 41 back pressure oil contents, article one, oil circuit directly is connected with clutch 3, second feeds back to dynamic pressure reducing valve 41 ante-chambers, and the 3rd oil circuit feeds back to dynamic pressure reducing valve 41 back cavities after entering one-way throttle valve 42.Mechanism is: along with clutch 3 pressure raise, feed back to dynamic pressure reducing valve 41 ante-chambers by the second oil circuit, feed back to dynamic pressure reducing valve 41 back cavities by the 3rd oil circuit pressure oil through behind the one-way throttle valve 42 simultaneously, because flowing pressure reduces, the pressure sum that the pressure of dynamic pressure reducing valve 41 ante-chambers overcomes pressure adjusting spring 414 active forces and back cavity turns down and enters clutch 3 oil circuit openings, but the rising along with clutch 3 pressure, opening turns down, more and more littler by dynamic pressure reducing valve 41 flows, cause one-way throttle valve 42 throttle orifices 423 front and back pressure reduction to reduce, when the pressure difference that is reduced to chamber, dynamic pressure reducing valve 41 front and back is not enough to overcome spring force, dynamic pressure reducing valve 41 openings reopen under the effect of spring force, continuation is to clutch 3 charged pressure oil, pressure is further raise, the while power reduction valve 41 that raises restarts to act on, and so circulation makes clutch 3 pressure slowly raise, and reaches the purpose of compensator or trimmer pressure characteristic.
Damping device 4 described in the utility model provides pressure source by the oil suction chamber that is arranged on the valve body 1 for damping device 4, break-make by hydraulic switching valve 2 pilot pressure oil, oil suction chamber is by the circular groove 415 on the oil duct A1 connection dynamic pressure reducing valve core 412, the pressure communication of described circular groove 415 is to clutch 3 pressure acting chambers, be communicated to dynamic pressure reducing valve 41 ante-chambers by oil duct B1 simultaneously, dynamic pressure reducing valve 41 ante-chambers are provided with one-way throttle valve 42 and preloading spring 421, dynamic pressure reducing valve core 412 back cavities are set with pressure adjusting spring 414, ante-chamber pressure oil can enter back cavity through one-way throttle valve 42, dynamic pressure reducing valve spool 412 back cavities are connected to the ante-chamber of energy storage piston 432 by oil duct C1, and energy storage piston 432 back cavities have energy-storaging spring 433.Hydraulic switching valve 2 is opened the circular groove 415 that the back high pressure oil enters dynamic pressure reducing valve 41, enter the ante-chamber of dynamic pressure reducing valve 41 simultaneously and enter back cavity by one-way throttle valve 42, because the ante-chamber of dynamic pressure reducing valve 41 and the back cavity pressure oil of dynamic pressure reducing valve 41 form pressure difference promotion dynamic pressure reducing valve spool 412 through throttle orifice 423 and turn down the pressure hydraulic fluid port that dynamic pressure reducing valve 41 enters clutch 3, make clutch 3 pressure not set up rapidly, the spring of increase compress energy storage gradually 433 along with energy storage piston 432 ante-chamber pressure oils, cavity pressure raises gradually before the energy storage piston 432, promotion dynamic pressure reducing valve spool 412 cavity direction forward moves, the circular groove 415 of dynamic pressure reducing valve 41 and the opening of valve body 1 have been increased, pressure in the circular groove 415 begins again to continue to increase, pressure in the circular groove 415 promotes dynamic pressure reducing valve spool 412 again and moves the opening that turns down circular groove 415 and valve body 1 hydraulic fluid port when increasing, pass through dynamic motion repeatedly like this, thereby make clutch 3 pressure set up slowly.Because the effect of one-way throttle valve 42, the fluid in clutch 3 and accumulation of energy chamber 431 is avoided next action gear is played interference effect through the process of one-way valve fast pressure relief in process out of supply.
Damping device 4 can play effective control to buffer time by the parameters such as damping hole size, pressure adjusting spring 414, energy storage piston 432 strokes and energy-storaging spring 433 of regulating one-way throttle valve 42 in the utility model, can require to obtain different pressure at the difference of each speed stage and different type of machines and set up characteristic, thereby realize that each gear control pressurer system is independent of each other.
The utility model can be changed by designing different transition valve pieces at different gearbox incoming pressure hydraulic fluid port positions and quantity, thereby realizes versatility of the present utility model.
Claims (6)
1. the power shfit speed change control valve of a gear individual buffer, comprise valve body (1), hydraulic switching valve (2) and clutch (3), described hydraulic switching valve (2) comprises direction gear shifting hydraulic switch valve (21) and speed gear shifting hydraulic switch valve (22), described clutch (3) comprises direction gear shift sleeve (31) and speed gear shift sleeve (32), described direction gear shifting hydraulic switch valve (21) is connected with direction gear shift sleeve (31), described speed gear shifting hydraulic switch valve (22) is connected with speed gear shift sleeve (32), it is characterized in that: be provided with damping device (4) between described speed gear shifting hydraulic switch valve (22) and the speed gear shift sleeve (32).
2. the power shfit speed change control valve of gear individual buffer as claimed in claim 1, it is characterized in that: described damping device (4) comprises dynamic pressure reducing valve (41), one-way throttle valve (42) and accumulator assembly (43), the oil outlet of described dynamic pressure reducing valve (41) connects speed gear shift sleeve (32) parallel with one another and accumulator assembly (43) respectively, be provided with one-way throttle valve (42) between described dynamic pressure reducing valve (41) and the accumulator assembly (43), one-way throttle valve is to dynamic pressure reducing valve (41) one side conductings; The oil outlet of described dynamic pressure reducing valve (41) is provided with the ante-chamber that the pressure feedback oil circuit connects dynamic pressure reducing valve (41), is provided with between described one-way throttle valve (42) and the accumulator assembly (43) and feeds back the back cavity that oil circuit is connected dynamic pressure reducing valve (41).
3. the power shfit speed change control valve of gear individual buffer as claimed in claim 2, it is characterized in that: described dynamic pressure reducing valve (41) comprises dynamic pressure reducing valve cavity (411), dynamic pressure reducing valve spool (412), plug (413) and the pressure adjusting spring (414) of band through hole, described spool (412) excircle is provided with circular groove (415), be connected by pressure adjusting spring (414) between described dynamic pressure reducing valve spool (412) and the valve body (1), dynamic pressure reducing valve spool (412) slides in dynamic pressure reducing valve cavity (411), working connection is communicated with circular groove (415) by oil duct A1, circular groove (415) is communicated with the ante-chamber of dynamic pressure reducing valve (41) by oil duct B1, circular groove (415) is communicated with the aperture that the slip of dynamic pressure reducing valve spool (412) can be regulated each oil duct with clutch (3) simultaneously; Described one-way throttle valve (42) comprises preloading spring (421) and one-way throttle valve core (422), and described one-way throttle valve core (422) is provided with throttle orifice (423); By plug (413) one-way throttle valve (42) is fixed on dynamic pressure reducing valve spool (412) inside, described preloading spring (421) two ends connect plug (413) and one-way throttle valve core (422) respectively; The ante-chamber of described dynamic pressure reducing valve (41) is communicated with the back cavity of dynamic pressure reducing valve (41) by the plug (413) of band through hole and the one-way throttle valve core (422) of band throttle orifice (423) successively; The back cavity of dynamic pressure reducing valve (41) connects accumulator assembly (43) by oil duct C1.
4. the power shfit speed change control valve of gear individual buffer as claimed in claim 3, it is characterized in that: described accumulator assembly (43) comprises accumulation of energy chamber (431), energy storage piston (432) and energy-storaging spring (433), described energy storage piston (432) and energy-storaging spring (433) are installed on inside, accumulation of energy chamber (431), and described energy storage piston (432) is sliding in accumulation of energy chamber (431) under energy-storaging spring (433) and the oil pressure effect.
5. the power shfit speed change control valve of gear individual buffer as claimed in claim 4 is characterized in that: the tail position of described energy storage piston (432) is provided with the guide sleeve (434) that energy-storaging spring (433) is installed.
6. as the power shfit speed change control valve of each described gear individual buffer among the claim 1-5, it is characterized in that: be provided with damping device (4) between described direction gear shifting hydraulic switch valve (21) and the direction gear shift sleeve (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320050031 CN203051736U (en) | 2013-01-30 | 2013-01-30 | Power shift transmission operating valve with independent buffering gears |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320050031 CN203051736U (en) | 2013-01-30 | 2013-01-30 | Power shift transmission operating valve with independent buffering gears |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203051736U true CN203051736U (en) | 2013-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320050031 Expired - Fee Related CN203051736U (en) | 2013-01-30 | 2013-01-30 | Power shift transmission operating valve with independent buffering gears |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203051736U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075509A (en) * | 2013-01-30 | 2013-05-01 | 江苏柳工机械有限公司 | Power gear shift speed change operating valve with independent buffer for gears |
| CN107166026A (en) * | 2017-07-19 | 2017-09-15 | 大连海事大学 | A kind of gear shifting hydraulic system of vehicle control device |
| CN107339416A (en) * | 2017-07-11 | 2017-11-10 | 山东临工工程机械有限公司 | A kind of gearbox manual shift control valve |
-
2013
- 2013-01-30 CN CN 201320050031 patent/CN203051736U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103075509A (en) * | 2013-01-30 | 2013-05-01 | 江苏柳工机械有限公司 | Power gear shift speed change operating valve with independent buffer for gears |
| CN103075509B (en) * | 2013-01-30 | 2015-09-30 | 江苏柳工机械有限公司 | The power gear shift speed change control valve of gear individual buffer |
| CN107339416A (en) * | 2017-07-11 | 2017-11-10 | 山东临工工程机械有限公司 | A kind of gearbox manual shift control valve |
| CN107339416B (en) * | 2017-07-11 | 2022-10-14 | 山东临工工程机械有限公司 | Manual gear shifting control valve for gearbox |
| CN107166026A (en) * | 2017-07-19 | 2017-09-15 | 大连海事大学 | A kind of gear shifting hydraulic system of vehicle control device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20190130 |
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| CF01 | Termination of patent right due to non-payment of annual fee |