CN102359586B - Proportional voltage regulation control system for automatic gearbox of forklift truck - Google Patents
Proportional voltage regulation control system for automatic gearbox of forklift truck Download PDFInfo
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- CN102359586B CN102359586B CN2011103540559A CN201110354055A CN102359586B CN 102359586 B CN102359586 B CN 102359586B CN 2011103540559 A CN2011103540559 A CN 2011103540559A CN 201110354055 A CN201110354055 A CN 201110354055A CN 102359586 B CN102359586 B CN 102359586B
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Abstract
The invention relates to a proportional voltage regulation control system for an automatic gearbox of a forklift truck. The system comprises a pilot valve, a proportional pressure reducing valve, an emergency reversing valve, a reversing valve, a two-position four-way linkage valve, a reverse emergency switching valve and a forward emergency switching valve, wherein the pilot valve is a two-position three-way electromagnetic valve; the emergency reversing valve is a three-position four-way manual reversing valve; the reversing valve is a three-position four-way electromagnetic valve; and the reverse emergency switching valve and the forward emergency switching valve are two-position three-way control valves. A pressure regulation valve, a cushion valve and an inching valve are eliminated, so that the cost and failure rate of a product are reduced; the proportional pressure reducing valve, the reversing valve and the two-position four-way linkage valve which are newly added are reasonably matched, so that the control system has high antijamming capability and reliability; due to a newly added adjustable throttle valve, the whole hydraulic system has a high back pressure cushion function and avoids shift impact; and due to a newly added emergency function, the control function of the whole vehicle is safer and more reliable by manually operating the emergency reversing valve under the condition that the control system fails.
Description
Technical field
The invention belongs to the self shifter control technique field of carrying vehicle, be specifically related to gearshift is realized to the hydraulic system of automatically controlling.
Background technique
At present, the Domestic Forklift transmission system adopts hydraudynamic drive more, and its gearshift mostly is the integrated electric hydraulic control valve with reversing gear, and adopting simultaneously fluid clutch is gear shifting actuating mechanism.The most speed Control that adopt the switch type on-off control valve to carry out fork truck of change control system, part automatic gear shifting speed changing system also has the control of shifting gears of direct employing switch valve, simultaneously, switch valve also all has application in industries such as engineering machinery, automobile, manufacturing.Because it has the many advantages such as cheap, that insensitive to polluting, antijamming capability is strong, make it in driving system of forklift truck, be widely used for many years.
Yet the control accuracy of this integrated electric hydraulic control valve is poor, pilot pressure can not be realized the ratio adjusting, in shift process, pressure in oil circuit is changed and can only realize switch control, therefore the large young pathbreaker of fluid clutch institute carry-over moment presses the step type variation, can cause like this gearshift impact that vehicle is serious, strong gearshift impact can make shorten the working life of transmission part, the reliability of car load reduces, can affect driver and passenger's riding comfort simultaneously, frequent for gearshift, the carrying vehicle of work under bad environment, the improvement of transmission system shift quality seems more important.
Summary of the invention
In order to solve gearshift, impact the impact that working life of performance to fork truck, driving component and driver and passenger's travelling comfort is brought, simultaneously, for the shift quality that improves forklift gear-box and the working life of improving driving component, the invention provides a kind of proportional pressure regulation control system for automatic gearbox of forklift.
Concrete improvement technological scheme is as follows:
Proportional pressure regulation control system for automatic gearbox of forklift comprises pilot valve 1, proportional pressure-reducing valve 8 and emergent selector valve 6, and pilot valve 1 is the two-bit triplet solenoid valve, and emergent selector valve 6 is the 3-position 4-way hand-operated direction valve; Wherein emergent oil inlet P 6 parallel connections of the ratio oil inlet P 8 of guide's oil inlet P 1 of pilot valve 1, proportional pressure-reducing valve 8 and emergent selector valve 6, the emergent switching filler opening T6 of guide's oil return inlet T 1 of pilot valve 1, the ratio oil return inlet T 8 of proportional pressure-reducing valve 8 and emergent selector valve 6 all is being communicated with fuel tank;
The ratio actuator port A8 of proportional pressure-reducing valve 8 is being communicated with the commutation oil inlet P 7 of selector valve 7, and described selector valve 7 is three position four-way electromagnetic valve; The commutation actuator port A7 that retreats of selector valve 7 is being communicated with respectively retreating oil inlet P 21 and advancing oil inlet P 22 of two four-way interstage valves 2 with the commutation actuator port B7 that advances; The slow astern of described two four-way interstage valves 2 gear actuator port A21 be communicated with retreat emergent switching valve 3 retreat switching oil inlet P 31, the gear actuator port A22 that advances of two four-way interstage valves 2 is being communicated with the switching oil inlet P 41 of advancing of the emergent switching valve 4 that advances, on two four-way interstage valves 2, also be provided with and retreat two gear actuator port B21 and advance two gear actuator port B22, two four-way interstage valves 2 retreat oil return inlet T 21 and oil return inlet T 22 parallel connections of advancing after be communicated with fuel tank, the described parallel connected end that retreats oil return inlet T 21 and the oil return inlet T 22 of advancing is provided with adjustable throttle valve 5; The described switching valve 3 of meeting an urgent need that retreats is the two-bit triplet control valve with the emergent switching valve 4 that advances, and retreats the emergent oil inlet P 32 of switching of retreating of emergent switching valve 3 and is being communicated with respectively retreating emergency operation hydraulic fluid port A6 and advancing emergency operation hydraulic fluid port B6 of emergent selector valve 6 with the emergent switching oil inlet P 42 of advancing of the emergent switching valve 4 that advances.
Described proportional pressure-reducing valve 8 models are TS98-P324.
Described throttle valve 5 throttle orifice apertures are 0.8～1.2 ㎜.
The present invention redesigns on the basis of former control system, increase electro-hydraulic proportional control system, high back pressure pooling feature and emergency function, newly-increased electro-hydraulic proportional system has the characteristics such as antijamming capability is strong, reliability is high, compact structure, price is low, control is flexible, low-speed stability is good; Cancel pressure regulator valve, trimmer valve and inching valve, reduced the manufacturing procedure of valve body, reduced cost and the rate of fault of product.The high back pressure pooling feature makes the control of gearshift overlap joint sequential between adjacent two gears more accurate.Emergency function can carry out operation and the operation of manually interim maneuver vehicle in the situation that automatic speed-changing system loses efficacy, and has avoided in the situation that the phenomenon that the control system paralysis can't be worked car load.Newly-designed control valve has improved the working life of shift quality and the driving component of gearbox, and has greatly improved the reliability of car load, has also improved combination property and the market competitiveness of car load simultaneously.
The present invention compares with the control system of prior art products, has the following advantages:
(1) the present invention is a kind of brand-new fork truck self shifter proportional pressure regulation control system, compares with original system, has cancelled pressure regulator valve, trimmer valve and inching valve, make the structure of valve body compacter, reduced the manufacturing procedure of valve body, installation and maintenance are convenient, reduced cost and the rate of fault of product.The Proper Match of the Proportional valve newly increased and selector valve and two four-way interstage valves makes control system have the characteristics such as stronger antijamming capability, reliability is high, control is flexible;
(2) adjustable throttle valve increased in the oil circuit of clutch, make whole hydraulic system have the high back pressure pooling feature, what throttling buffering and ratio were regulated jointly controls, make the control of gearshift overlap joint sequential between adjacent two gears more accurate, and prevented that the shift process medium power from interrupting, avoid gearshift to impact, improved the shift quality of gearbox, the working life of driving component and the reliability of car load;
(3) emergency function newly increased, solved in the situation that control system paralysis, and work inconvenience and unsafe problems that car load can't travel and bring, by the manual control selector valve of meeting an urgent need, make the control function of car load more safe and reliable.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Sequence number in upper figure: pilot valve 1, guide's oil inlet P 1, guide's oil return inlet T 1, guide's actuator port A1, two four-way interstage valves 2, retreat oil inlet P 21, slow astern gear actuator port A21, retreat oil return inlet T 21, retreat two gear actuator port B21, the oil inlet P 22 of advancing, the gear actuator port A22 that advances, the oil return inlet T 22 of advancing, two gear actuator port B22 advance, retreat emergent switching valve 3, retreat switching oil inlet P 31, retreat emergent switching oil inlet P 32, retreat switch operating hydraulic fluid port A3, emergent switching valve 4 advances, advance and switch oil inlet P 41, advancing meets an urgent need switches oil inlet P 42, switch operating hydraulic fluid port A4 advances, adjustable throttle valve 5, emergent selector valve 6, emergent oil inlet P 6, retreat emergency operation hydraulic fluid port A6, emergent switching filler opening T6, the emergency operation of advancing hydraulic fluid port B6, selector valve 7, commutation oil inlet P 7, retreat commutation actuator port A7, commutation oil return inlet T 7, commutation actuator port B7 advances, proportional pressure-reducing valve 8, ratio oil inlet P 8, ratio oil return inlet T 8, ratio actuator port A8.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Referring to Fig. 1, for the proportional pressure regulation control system of automatic gearbox of forklift, comprise pilot valve 1, proportional pressure-reducing valve 8 and emergent selector valve 6, pilot valve 1 is the two-bit triplet solenoid valve, emergent selector valve 6 is the 3-position 4-way hand-operated direction valve; The model of proportional pressure-reducing valve 8 is TS98-P324.Wherein after emergent oil inlet P 6 parallel connections of the ratio oil inlet P 8 of guide's oil inlet P 1 of pilot valve 1, proportional pressure-reducing valve 8 and emergent selector valve 6, be communicated with working connection, the emergent switching filler opening T6 of guide's oil return inlet T 1 of pilot valve 1, the ratio oil return inlet T 8 of proportional pressure-reducing valve 8 and emergent selector valve 6 all is being communicated with fuel tank.
The ratio actuator port A8 of proportional pressure-reducing valve 8 is being communicated with the commutation oil inlet P 7 of selector valve 7, and selector valve 7 is three-position four-way valve.The commutation actuator port A7 that retreats of selector valve 7 is being communicated with respectively retreating oil inlet P 21 and advancing oil inlet P 22 of two four-way interstage valves 2 with the commutation actuator port B7 that advances, the slow astern of two four-way interstage valves 2 gear actuator port A21 be communicated with retreat emergent switching valve 3 retreat switching oil inlet P 31, the gear actuator port A22 that advances of two four-way interstage valves 2 is being communicated with the switching oil inlet P 41 of advancing of the emergent switching valve 4 that advances, on two four-way interstage valves 2, also be provided with and retreat two gear actuator port B21 and advance two gear actuator port B22, retreat when two gear actuator port B21 are used with the two gear actuator port B22 that advance and be connected respectively and retreat two gear clutches and advance two gear clutches, two four-way interstage valves 2 retreat oil return inlet T 21 and oil return inlet T 22 parallel connections of advancing after be communicated with fuel tank, the parallel connected end that retreats oil return inlet T 21 and the oil return inlet T 22 of advancing of two four-way interstage valves 2 is provided with adjustable throttle valve 5, the throttle orifice aperture of adjustable throttle valve 5 can be regulated between 0.8-1.2 ㎜.Retreat the switching valve 3 of meeting an urgent need and be the two-bit triplet control valve with the emergent switching valve 4 that advances, retreat the emergent oil inlet P 32 of switching of retreating of emergent switching valve 3 and be communicated with respectively retreating emergency operation hydraulic fluid port A6 and advancing emergency operation hydraulic fluid port B6 of emergent selector valve 6 with the emergent switching oil inlet P 42 of advancing of the emergent switching valve 4 that advances; The switch operating hydraulic fluid port A4 that advances that retreats switch operating hydraulic fluid port A3 and the emergent switching valve 4 that advances that retreats emergent switching valve 3 is connected respectively slow astern gear clutch and advances a gear clutch.
Below in conjunction with Fig. 1, working principle of the present invention is elaborated:
At first, system pressure oil is three tunnels in node a punishment: the pilot valve 1 of the first via by two-position three way is be used to controlling two four-way interstage valves 2.The second tunnel enters emergency control by emergent selector valve 6.Third Road enters proportional pressure-reducing valve 8, by proportional pressure-reducing valve 8, regulates its pressure and changes by predefined rule.During work, ratio oil inlet P 8 is connected with ratio actuator port A8, and pressure oil enters the commutation oil inlet P 7 of three position four-way directional control valve 7 subsequently, and now system can be divided into following several working state:
(1), neutral position state, three position four-way directional control valve 7 is in the meta state, retreat commutation actuator port A7, the commutation actuator port B7 that advances connects oil returns with commutation oil return inlet T 7, now, pilot valve 1 is in the dead electricity off state, guide's actuator port A1 and guide's oil return inlet T 1 are connected oil return, all do not have pressure oil to enter in four clutches of gearbox, and vehicle is in neutral position state does not have power output.
(2), the forward gear operating mode is divided into advance a gear and the two gear operating modes of advancing: the gear operating mode of 1) advancing, the electromagnetic coil SF of selector valve 7 obtains electric, make it be in right position conducting, the oil inlet P 7 that makes to commutate is connected oil-feed with the commutation actuator port B7 that advances, and retreats commutation actuator port A7 and connects oil return with commutation oil return inlet T 7; Pilot valve 1 is in the dead electricity off state; Two four-way interstage valves 2 are operated in right position on state, pressure oil enters advancing of the emergent switching valve 4 that advances by the oil inlet P 22 of advancing of commutation actuator port B7 through two four-way interstage valves 2 of advancing with the gear actuator port A22 that advances and switches oil inlet P 41, the emergent switching valve 4 that now advances is in left position on state under the effect of spring force, the switching oil inlet P 41 of advancing is connected with the switch operating hydraulic fluid port A4 that advances, final pressure oil is entered the gear clutch that advances of gearbox by the switch operating hydraulic fluid port A4 that advances, vehicle is kept off a car by one, and speed is moved and power output.2) advance two the gear operating modes, selector valve 7 still is in right position on state, pilot valve 1 obtains the electric left position on state that is in, guide's oil inlet P 1 is connected with guide's actuator port A1, pilot pressure oil makes two four-way interstage valves 2 be in left position on state, the oil inlet P of now advancing 22 and the two gear actuator port B22 that advance connect, and final pressure oil directly enters the two gear clutches that advance of gearbox through the two gear actuator port B22 that advance, and vehicle is exported by two keep off a car speed operation and power.
(3), retreating the gear operating mode is divided into the slow astern gear and retreats two gear operating modes: 1) slow astern gear operating mode, the electromagnetic coil SR of selector valve 7 obtains the electric left position conducting that is in, make to commutate oil inlet P 7 with retreat commutation actuator port A7 and connect oil-feed, the commutation actuator port B7 that advances connects oil return with commutation oil return inlet T 7, pilot valve 1 is in the dead electricity off state, two four-way interstage valves 2 are operated in right position on state, pressure oil enters and retreats emergent switching valve 3 by retreating retreat oil inlet P 21 and the slow astern gear actuator port A21 of commutation actuator port A7 through two four-way interstage valves 2, now retreat emergent switching valve 3 and under the effect of spring force, be in left position conducting, retreat switching oil inlet P 31 and retreat switch operating hydraulic fluid port A3 connection, final pressure oil enters the slow astern gear clutch of gearbox through retreating switch operating hydraulic fluid port A3, vehicle is kept off a car by one, and speed is moved and power output.2) retreat two gear situations, selector valve 7 still is in left position on state, pilot valve 1 obtains the electric left position on state that is in, guide's oil inlet P 1 is connected with guide's actuator port A1, pilot pressure oil makes two four-way interstage valves 2 be in left position on state, now retreat oil inlet P 21 and retreat two and keep off actuator port B21 connection, final pressure oil directly enters the two gear clutches that retreat of gearbox through retreating two gear actuator port B21, and vehicle is kept off a car by two, and speed is moved and power is exported.
(4), the automatic speed changing operating mode, in Fig. 1, control valve is except emergent selector valve 6 and selector valve 7, all the other control valves, by the variation of automatic shift control device according to car load speed and engine throttle opening two parameters, are controlled its on off operating mode by the self shifter rule.In car load lifting when gear, is by proportional pressure-reducing valve 8, regulate the Changing Pattern of oil circuit pressure, make the clutch smooth and steady combination, for the separation that prevents a certain gear clutch, cause the power interruption of moment, in the oil circuit of clutch, increase adjustable throttle valve 5, its effect is the disengaging time that delays the clutch be about to separated, make will in conjunction with clutch have ample time and realize the moment switching, avoid gearshift to impact to improve shift quality.
(5), emergency function, retreat emergent switching valve 3, the emergent selector valve 6 of advance emergent switching valve 4 and 3-position 4-way, its major function is in the situation that the control system paralysis can be switched to manual control gearshift pattern.According to the working state of emergent selector valve 6, emergency function has following several operating mode: 1) neutral position state, and now emergency function is inoperative, is the automatic speed changing operating mode; 2) the emergent operating mode of a gear of advancing, now emergent selector valve 6 is in right position on state, emergent oil inlet P 6 is connected with the emergency operation hydraulic fluid port B6 that advances, pressure oil enters through the emergency operation hydraulic fluid port B6 that advances the emergent switching valve 4 that advances, guide's oil pressure makes it be in right position on state, now advancing emergent switching oil inlet P 42 is connected with the switch operating hydraulic fluid port A4 that advances, and final pressure oil enters the gear clutch that the advances operation of can temporarily meeting an urgent need; 3) the emergent operating mode of slow astern gear, now emergent selector valve 6 is in left position on state, emergent oil inlet P 6 with retreat emergency operation hydraulic fluid port A6 and connect, pressure oil enters and retreats emergent switching valve 3 through retreating emergency operation hydraulic fluid port A6, guide's oil pressure makes it be in right position on state, now retreating emergent switching oil inlet P 32 and connecting with retreating switch operating hydraulic fluid port A3, final pressure oil enters the operation of can temporarily meeting an urgent need of slow astern gear clutch.Necessary cutting-off controlling device power supply when using emergency valve, prevent manually and automatic function is moved to gearbox and brought damage simultaneously.
Claims (3)
1. for the proportional pressure regulation control system of automatic gearbox of forklift, it is characterized in that: comprise pilot valve (1), proportional pressure-reducing valve (8) and emergent selector valve (6), pilot valve (1) is the two-bit triplet solenoid valve, and emergent selector valve (6) is the 3-position 4-way hand-operated direction valve; Wherein emergent filler opening (P6) parallel connection of the ratio filler opening (P8) of guide's filler opening (P1) of pilot valve (1), proportional pressure-reducing valve (8) and emergent selector valve (6), the emergent switching filler opening (T6) of guide's return opening (T1) of pilot valve (1), the ratio return opening (T8) of proportional pressure-reducing valve (8) and emergent selector valve (6) all is being communicated with fuel tank;
The ratio actuator port (A8) of proportional pressure-reducing valve (8) is being communicated with the commutation filler opening (P7) of selector valve (7), and described selector valve (7) is three position four-way electromagnetic valve, selector valve (7) retreat commutation actuator port (A7) and advance commutate that actuator port (B7) is being communicated with respectively two four-way interstage valves (2) retreat filler opening (P21) and the filler opening that advances (P22), the slow astern of described two four-way interstage valves (2) gear actuator port (A21) be communicated with retreat emergent switching valve (3) retreat switching filler opening (P31), the gear actuator port (A22) that advances of two four-way interstage valves (2) is being communicated with the switching filler opening (P41) that advances of the emergent switching valve (4) that advances, on two four-way interstage valves (2), also be provided with and retreat two gear actuator ports (B21) and advance two gear actuator ports (B22), two four-way interstage valves (2) retreat return opening (T21) and the return opening that advances (T22) parallel connection after be communicated with fuel tank, the described parallel connected end that retreats return opening (T21) and the return opening that advances (T22) is provided with adjustable throttle valve (5), describedly retreat emergent switching valve (3) and the emergent switching valve (4) that advances is the two-bit triplet control valve, retreat advancing of the emergent switching filler opening (P32) of retreating of emergent switching valve (3) and the emergent switching valve (4) that advances emergent switch that filler opening (P42) is being communicated with respectively emergent selector valve (6) retreat emergency operation hydraulic fluid port (A6) and the emergency operation hydraulic fluid port (B6) that advances.
2. the proportional pressure regulation control system for automatic gearbox of forklift according to claim 1, it is characterized in that: described proportional pressure-reducing valve (8) model is TS98-P324.
3. the proportional pressure regulation control system for automatic gearbox of forklift according to claim 1, it is characterized in that: described throttle valve (5) throttle orifice aperture is 0.8～1.2 ㎜.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103540559A CN102359586B (en) | 2011-11-10 | 2011-11-10 | Proportional voltage regulation control system for automatic gearbox of forklift truck |
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| CN2011103540559A CN102359586B (en) | 2011-11-10 | 2011-11-10 | Proportional voltage regulation control system for automatic gearbox of forklift truck |
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| CN102359586A CN102359586A (en) | 2012-02-22 |
| CN102359586B true CN102359586B (en) | 2013-11-27 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486245B (en) * | 2013-09-29 | 2016-06-29 | 长城汽车股份有限公司 | A kind of double-clutch hydraulic control system |
| CN106286449A (en) * | 2016-10-09 | 2017-01-04 | 合肥协力液压科技有限公司 | One is flexible coupling electric hydraulic control valve |
| CN111810626B (en) * | 2020-07-07 | 2022-06-10 | 中国第一汽车股份有限公司 | Hydraulic control system of dual clutch transmission |
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| US4164876A (en) * | 1977-05-09 | 1979-08-21 | Clark Equipment Company | Downshift inhibitor circuit |
| US5367922A (en) * | 1992-02-24 | 1994-11-29 | Hyundai Motor Company | Hydraulic control system for an automatic transmission having an R-N-D control valve |
| CN101858431A (en) * | 2010-04-17 | 2010-10-13 | 浙江吉利汽车研究院有限公司 | Hydraulic device for gear shift of double-clutch automatic transmission |
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| CN102120447A (en) * | 2011-03-04 | 2011-07-13 | 安徽合力股份有限公司 | Forklift hydraulic system matched with multi-functional wet brakes |
| CN202327056U (en) * | 2011-11-10 | 2012-07-11 | 安徽合力股份有限公司 | Proportional pressure regulation control system for automatic gearbox of forklift |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003341495A (en) * | 2002-05-27 | 2003-12-03 | Tcm Corp | Industrial vehicle |
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2011
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| US4164876A (en) * | 1977-05-09 | 1979-08-21 | Clark Equipment Company | Downshift inhibitor circuit |
| US5367922A (en) * | 1992-02-24 | 1994-11-29 | Hyundai Motor Company | Hydraulic control system for an automatic transmission having an R-N-D control valve |
| CN102042396A (en) * | 2009-10-22 | 2011-05-04 | 本田技研工业株式会社 | Oil pressure control device for transmission |
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