CN201212549Y - Hydraulic control circuit for metal strip type stepless transmission - Google Patents
Hydraulic control circuit for metal strip type stepless transmission Download PDFInfo
- Publication number
- CN201212549Y CN201212549Y CNU2008200993211U CN200820099321U CN201212549Y CN 201212549 Y CN201212549 Y CN 201212549Y CN U2008200993211 U CNU2008200993211 U CN U2008200993211U CN 200820099321 U CN200820099321 U CN 200820099321U CN 201212549 Y CN201212549 Y CN 201212549Y
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- oil pipe
- movable plate
- oil
- hydraulic control
- cylinder
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Abstract
The utility model discloses a hydraulic control loop for a metal belt type continuously variable transmission. A driving wheel set and a driven wheel set are both composed of a movable disc and a fixed disc, wherein the fixed disc is fixed with a transmission axle corresponding to the fixed disc, and the movable disc is sleeved on the corresponding transmission axle and can slide on the axle; both the movable disc and the fixed disc adopt a conical surface structure, the conical surfaces of the movable disc and the fixed disc form V-shaped grooves contacted with a metal transmission belt, control cylinders for pushing the movable discs to axially slide are arranged at one side of the movable discs of the driving wheel set and the driven wheel set, the two control cylinders are connected with the identical hydraulic pump respectively through a main oil pipe, the hydraulic pump is driven by a servo motor, and a hydraulic control one-way valve is arranged on the main oil pipe. The utility model has the advantages that the fuel oil can be saved to the utmost extent, and the economical efficiency is good; and meanwhile, the number of the elements in the system is small, the high degree of integration can be realized, the volume is small, the weight is light, the efficiency is high, thereby the structure is quiet compact so that the space is saved.
Description
Technical field
The utility model relates to the employed stepless speed variator of automobile, specifically refers to a kind of metal band type stepless speed variator hydraulic control circuit, belongs to the stepless variable transmission technique field.
Background technique
CVT (stepless speed variator) technology occurs in automobile industry at present, even in some vehicles, obtained application.This technology mainly comprises the initiatively basic elements of character such as wheels, driven wheels, metal tape and oil hydraulic pump.Initiatively wheels and driven wheels all are made up of movable plate and fixed tray, and a side belt wheel close with oil cylinder can slide on axle, and opposite side is then fixing.Movable plate and fixed tray all are cone structures, and their conical surface forms the V-type groove and comes and the engagement of V-type metal driving belt.The oil pump of prior art is directly to link to each other with motor, and the power of engine output shaft output at first is delivered to the driving wheel of CVT, is delivered to follower by the V-type driving belt then, after retarder, differential mechanism pass to wheel and drive automobile.Movable plate by driving wheel and follower during work moves axially the radius of clean-up that changes driving wheel, the follower conical surface and the engagement of V-type driving belt, thereby changes velocity ratio.The axial internal clearance of movable plate is realized by control system adjusting driving wheel, follower oil hydraulic pump oil cylinder working-pressure as required by the driver.Because the radius of clean-up of driving wheel and follower can realize continuous adjusting, thereby has realized stepless change.
In the hydraulic system of metal band type stepless speed variator, the effect of slave cylinder is the tension force of control metal tape,, reliably transmission efficient from the power of motor to guarantee.The actuating cylinder control initiatively position of cone pulley is moved vertically, moves along the V-type groove at active wheels metal tape, because the length of metal tape is constant, metal tape changes in the opposite direction along the V-type groove on driven wheels.The turning radius of metal tape on active wheels and driven wheels changes, and realizes the continuous variation of speed ratio.When automobile began to start to walk, the radius of clean-up of driving wheel was less, and speed changer can obtain bigger velocity ratio, thereby guaranteed that ransaxle can have enough moments of torsion to guarantee that automobile has higher acceleration.Along with the increase of the speed of a motor vehicle, the radius of clean-up of driving wheel increases gradually, and the radius of clean-up of follower is corresponding to be reduced, and the velocity ratio of CVT descends, and makes automobile to travel with higher speed.
Metal current variable v-belt drive electrohydraulic control system mainly contains two kinds of hydraulic solution, be respectively single pressure circuit and two pressure circuit, their common feature is all to be to adopt open type throttling control (valve control) loop, the deficiency of throttling control electrohydraulic system maximum is to have big restriction loss, and system capacity efficient is low and cause system's heating.So new developing direction is without valve, directly control the motion of oil hydraulic cylinder with oil hydraulic pump.Because the oil pump that is assemblied in now among the CVT on the automobile is directly to link to each other with motor, when engine speed was higher, oil pump capacity was too much, and the throttling loss is big, causes the oil pump consumed energy many, and the fuel oil loss is big, and is less economical.
The model utility content
At the prior art above shortcomings, the purpose of this utility model provides a kind of metal band type stepless speed variator hydraulic control circuit that big fuel-economizing potentiality, good economy performance, compact structure are arranged.
The technical solution of the utility model is achieved in that a kind of metal band type stepless speed variator hydraulic control circuit, comprise driving shaft, active wheels, driven shaft, driven wheels and metal driving belt, initiatively wheels and driven wheels are formed by movable plate and fixed tray, fixed tray is fixed with corresponding transmission shaft, and movable plate is placed on the corresponding transmission shaft and can slides on axle; Movable plate and fixed tray are cone structure, movable plate forms the V-type groove with the conical surface of fixed tray and contacts with the metal driving belt, it is characterized in that: be provided with in active wheels and driven wheels movable plate one side and promote movable plate and control oil cylinder in axial sliding, two control oil cylinders are connected with same oil hydraulic pump by main oil pipe respectively, oil hydraulic pump is driven by servomotor, is provided with Pilot operated check valve on main oil pipe.
Be equipped with branch oil pipe on the main oil pipe that enters two Pilot operated check valves, branch oil pipe is connected with the hydraulic control mouth of another Pilot operated check valve respectively.
Be equipped with relief valve on the main oil pipe that enters two control oil cylinders, relief valve is connected with the overflow cylinder by the overflow oil pipe.
It also comprises the repairing cylinder, and the repairing cylinder is connected with main oil pipe between oil hydraulic pump and branch oil pipe by the repairing pipe, is provided with the shuttle valve of being made up of two repairing one-way valves on the repairing pipe.
The utility model is used for metal band type stepless speed variator to the direct drive type volume control system, the directly driven volume controlled electro-hydraulic servo system is that the rotating speed that leans on actuating motor to change metering pump changes output flow, replace electrohydraulic control, reach the purpose of regulating executive component.Since be to realize pressure balanced between two cylinders by oil liquid pressure, only need very little external force consumption just can change this balance, so can save fuel oil, good economy performance to greatest extent.Because fuel consumption is very low, only need establish a little oil tank in the oil circuit in this system and get final product, and not have independent fuel tank; Component number in the simultaneity factor is few, can realize highly integratedly, and volume is little, in light weight, efficient is high, so its structure is quite compact and save the space.
Description of drawings
Fig. 1-the utility model structural representation.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.Referring to Fig. 1, as can be seen, metal band type stepless speed variator hydraulic control circuit of the present utility model comprises driving shaft 1, initiatively wheels, driven shaft 2, driven wheels and metal driving belt 3 from the figure, and driven shaft 2 is connected with main reducing gear 5 by gear 4.Initiatively wheels and driven wheels are formed by movable plate 6 and fixed tray 7, and fixed tray 7 is fixed with corresponding transmission shaft, and movable plate 6 is placed on the corresponding transmission shaft and can slides on axle; Movable plate 6 is a cone structure with fixed tray 7, and movable plate 6 forms the V-type groove with the conical surface of fixed tray 7 and contacts with metal driving belt 3.Be provided with in active wheels and driven wheels movable plate 6 one sides and promote movable plate 6 and control oil cylinder in axial sliding, two control oil cylinders are connected with same oil hydraulic pump 9 by main oil pipe 8 respectively, oil hydraulic pump 9 is driven by servomotor 10, is provided with Pilot operated check valve 11 and prevents that oil cylinder liquid from flowing back to stream on main oil pipe 8.Be equipped with branch oil pipe 12 on the main oil pipe 8 that enters two Pilot operated check valves 11, branch oil pipe 12 is connected with the hydraulic control mouth of another Pilot operated check valve 11 respectively, but when being used for the mantle dish and moving, opens the way to cycle oil of oil return cylinder.The positive and negative rotation of servomotor 10 drives oil hydraulic pump 9 to different control oil cylinder (the initiatively oil cylinder on wheels or the driven wheels) pump oil fuel feeding.
As can be seen, be equipped with axial fluid passage 13 on driving shaft 1 and driven shaft 2 from the figure, main oil pipe 8 is communicated with fluid passage 13 by pipe joint 14.One-body molded on movable plate 6 have a cylinder barrel 15, and movable plate 6 is as being provided with seal ring 16 between seal face of oil cylinder and the transmission shaft, and the cylinder sleeve 17 and the transmission shaft of oil cylinder are fixed, and are provided with seal ring 16 equally between cylinder sleeve 17 and cylinder barrel 15 inwalls.On transmission shaft, be provided with the oilhole 18 that fluid passage 13 is communicated with cylinder cavity.Traditional oil cylinder is the cylinder sleeve motion, and cylinder barrel is fixed, and both produce relative movement.The utility model is the cylinder barrel motion, and cylinder sleeve is fixed, and both produce relative movement.
Be equipped with relief valve 19 on the main oil pipe 8 that enters two control oil cylinders, relief valve 19 is connected with overflow cylinder 21 by overflow oil pipe 20.When oil cylinder working-pressure is excessive, carry out off-load by this structure.
The utility model also comprises repairing jar 22, and repairing jar 22 is connected with main oil pipe 8 between oil hydraulic pump 9 and branch oil pipe 12 by repairing pipe 23, is provided with the shuttle valve of being made up of two repairing one-way valves 24 on repairing pipe 23.When appearance caused underfed because of reasons such as leakages in this closed circuit, the shuttle valve repairing was in the loop.
Working principle of the present utility model:
As seen from the figure, oil hydraulic pump constitutes closed circuit with the control oil cylinder.Servomotor drives the hydraulic pressure metering pump and produces hydraulic power, promotes movable plate by a pair of hydraulic control oil cylinder and moves.The startup of movable plate and stop, break-in and speed change all realize according to control command by servomotor.The shuttle valve of being made up of two one-way valves that is connected in parallel in the closed circuit mainly plays the Fill valve effect, and when appearance caused underfed because of reasons such as leakages in this closed circuit, the shuttle valve repairing was in the loop.Be connected on and form hydraulic lock by two Pilot operated check valves in the major loop, when movable plate reaches specified position, oil hydraulic pump quits work, and prevents to control the oil cylinder phenomenon of backflowing.Two relief valves that are connected in parallel in the closed circuit play safety effect.Two relief valves also can prevent overburden and carry out off-load in the short time when work on major loop.In fact, when in whole system, overburden occurring, also can shut down, reach the safety protection effect by the limit torque protective function action of servomotor.
Claims (4)
1, a kind of metal band type stepless speed variator hydraulic control circuit, comprise driving shaft (1), active wheels, driven shaft (2), driven wheels and metal driving belt (3), initiatively wheels and driven wheels are formed by movable plate (6) and fixed tray (7), fixed tray (7) is fixed with corresponding transmission shaft, and movable plate (6) is placed on the corresponding transmission shaft and can slides on axle; Movable plate (6) is a cone structure with fixed tray (7), movable plate (6) forms the V-type groove with the conical surface of fixed tray (7) and contacts with metal driving belt (3), it is characterized in that: be provided with in active wheels and driven wheels movable plate (6) one sides and promote movable plate and control oil cylinder in axial sliding, two control oil cylinders are connected with same oil hydraulic pump (9) by main oil pipe (8) respectively, oil hydraulic pump (9) is driven by servomotor (10), is provided with Pilot operated check valve (11) on main oil pipe (8).
2, metal band type stepless speed variator hydraulic control circuit according to claim 1 is characterized in that: be equipped with branch oil pipe (12) on the main oil pipe that enters two Pilot operated check valves (8), branch oil pipe is connected with the hydraulic control mouth of another Pilot operated check valve respectively.
3, metal band type stepless speed variator hydraulic control circuit according to claim 1 and 2, it is characterized in that: be equipped with relief valve (19) on the main oil pipe (8) that enters two control oil cylinders, relief valve (19) is connected with overflow cylinder (21) by overflow oil pipe (20).
4, metal band type stepless speed variator hydraulic control circuit according to claim 3, it is characterized in that: it also comprises repairing cylinder (22), repairing cylinder (22) is connected with main oil pipe (8) between oil hydraulic pump and branch oil pipe by repairing pipe (23), is provided with the shuttle valve of being made up of two repairing one-way valves (24) on repairing pipe (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200993211U CN201212549Y (en) | 2008-07-01 | 2008-07-01 | Hydraulic control circuit for metal strip type stepless transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200993211U CN201212549Y (en) | 2008-07-01 | 2008-07-01 | Hydraulic control circuit for metal strip type stepless transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201212549Y true CN201212549Y (en) | 2009-03-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200993211U Expired - Fee Related CN201212549Y (en) | 2008-07-01 | 2008-07-01 | Hydraulic control circuit for metal strip type stepless transmission |
Country Status (1)
| Country | Link |
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| CN (1) | CN201212549Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907108A (en) * | 2010-07-29 | 2010-12-08 | 南通航海机械集团有限公司 | Miniature power unit |
| CN102102742A (en) * | 2009-12-16 | 2011-06-22 | 财团法人工业技术研究院 | Hydraulic control dry-type belt stepless variable speed mechanism |
| CN102494128A (en) * | 2011-12-13 | 2012-06-13 | 重庆市科学技术研究院 | Pump-controlled CVT (continuously variable transmission) electric hydraulic control system |
| CN102910063A (en) * | 2012-11-01 | 2013-02-06 | 重庆长安汽车股份有限公司 | Hydraulic system and control method for hybrid electric vehicle |
| CN101788052B (en) * | 2009-12-30 | 2013-05-08 | 重庆理工大学 | Motor driven CVT (continuously variable transmission) electro-hydraulic control system |
| CN103423394A (en) * | 2012-05-23 | 2013-12-04 | 刘宏伟 | Large-torque CVT (continuously variable transmission) structure and hydraulic control system |
| CN104389996A (en) * | 2014-09-10 | 2015-03-04 | 湘潭大学 | Transmission closed loop type slip rate testing method of metal strap of continuously variable transmission |
-
2008
- 2008-07-01 CN CNU2008200993211U patent/CN201212549Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102742A (en) * | 2009-12-16 | 2011-06-22 | 财团法人工业技术研究院 | Hydraulic control dry-type belt stepless variable speed mechanism |
| CN101788052B (en) * | 2009-12-30 | 2013-05-08 | 重庆理工大学 | Motor driven CVT (continuously variable transmission) electro-hydraulic control system |
| CN101907108A (en) * | 2010-07-29 | 2010-12-08 | 南通航海机械集团有限公司 | Miniature power unit |
| CN102494128A (en) * | 2011-12-13 | 2012-06-13 | 重庆市科学技术研究院 | Pump-controlled CVT (continuously variable transmission) electric hydraulic control system |
| CN102494128B (en) * | 2011-12-13 | 2015-08-26 | 重庆市科学技术研究院 | Pump control CVT electrohydraulic control system |
| CN103423394A (en) * | 2012-05-23 | 2013-12-04 | 刘宏伟 | Large-torque CVT (continuously variable transmission) structure and hydraulic control system |
| CN102910063A (en) * | 2012-11-01 | 2013-02-06 | 重庆长安汽车股份有限公司 | Hydraulic system and control method for hybrid electric vehicle |
| CN102910063B (en) * | 2012-11-01 | 2016-02-03 | 重庆长安汽车股份有限公司 | A kind of hybrid vehicle Hydraulic system and control method |
| CN104389996A (en) * | 2014-09-10 | 2015-03-04 | 湘潭大学 | Transmission closed loop type slip rate testing method of metal strap of continuously variable transmission |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090325 |