CN201306440Y - Hydraulic control circuit for low-energy-consumption metal belt type continuously variable transmission - Google Patents
Hydraulic control circuit for low-energy-consumption metal belt type continuously variable transmission Download PDFInfo
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- CN201306440Y CN201306440Y CNU2008200990162U CN200820099016U CN201306440Y CN 201306440 Y CN201306440 Y CN 201306440Y CN U2008200990162 U CNU2008200990162 U CN U2008200990162U CN 200820099016 U CN200820099016 U CN 200820099016U CN 201306440 Y CN201306440 Y CN 201306440Y
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Abstract
The utility model relates to a hydraulic control circuit for a low-energy-consumption metal belt type continuously variable transmission, which comprises a hydraulic pump, a speed ratio control valve, a driven-wheel hydraulic cylinder and a driving-wheel hydraulic cylinder; wherein, the inlet of the hydraulic pump is connected with an oil tank through an oil tube; the three ports of the speed ratio control valve are respectively connected with the driven-wheel hydraulic cylinder, the driving-wheel hydraulic cylinder and the oil tank through oil tubes; the outlet of a main pressure regulator valve is connected with the inlet of the hydraulic pump through an oil tube; and an one-way valve is arranged on the oil tube connected between the hydraulic pump and the oil tank. A spillover valve is arranged on the oil tube connected between the speed ratio control valve and the oil tank, and an oil tube arranged between the spillover valve and the speed ratio control valve is connected with the inlet of the hydraulic cylinder. When the continuously variable transmission is decelerated or stopped, the pressure oil in a hydraulic system, which is about to flow back into the oil tank, is led into the inlet of the pump, consequently, the pressure difference between the outlet and inlet of the pump can be reduced, and the purpose of reducing energy loss is achieved.
Description
Technical field
The utility model relates to the stepless speed variator hydraulic control circuit, and especially a kind of low energy consumption metal band type stepless speed variator hydraulic control circuit belongs to the stepless speed variator technical field.
Background technique
The automobile metal variable v-belt drive is the type of belt drive of the tool prospect of current automatic gearbox, and the automobile metal variable v-belt drive overwhelming majority adopts electro-hydraulic systems control at present.And the CVT electrohydraulic control system mainly contains two kinds of hydraulic solution, is respectively single pressure circuit and two pressure circuit.Two pressure circuit actuating cylinder areas and slave cylinder area are basic identical, have the influence of dynamic pressure hardly, but its complex structure, the quantity of hydrovalve is many, and the cost height is unfavorable for the development in automobile industry with keen competition.Domestic research all is based on single pressure circuit system basically, single pressure circuit hydraulic system structure as shown in Figure 1, it comprises main pressure regulator valve 1, clamping force control valve 2, Transmission Ratio Control valve 3, oil hydraulic pump 4, follower oil hydraulic cylinder 7, driving wheel oil hydraulic cylinder 8 and motor 9.Oil hydraulic pump 4 inlets are connected with fuel tank 10 by oil pipe, the 3-position-3-way valve of Transmission Ratio Control valve 3 for having pressure feedback, and three interfaces of Transmission Ratio Control valve 3 are connected with follower oil hydraulic cylinder 7, driving wheel oil hydraulic cylinder 8 and fuel tank 10 by oil pipe respectively.When speed change, oil hydraulic pump 4 is connected by clamping force control valve 2 or with follower oil hydraulic cylinder 7, or is connected with Transmission Ratio Control valve 3; When speed changer stopped speed change, oil hydraulic pump 4, main pressure regulator valve 1 and fuel tank 10 formed circulation loop.Though single pressure circuit can produce bigger dynamic pressure in the actuating cylinder high speed rotating, to compare with the biliquid hydraulic circuit, it has simple in structure, and the quantity of required control valve is few, and the advantage that controlled variable is few has bigger use value.
Pump and hydraulic system are that CVT guarantees transmission and the source of realizing the pressure oil of speed change, as long as engine operation, pump and hydraulic system will be worked, especially present most usefulness all be gear pump, belong to metering pump.In order to guarantee the reaction velocity of speed governing, must guarantee certain flow, in order to guarantee the step up power of oil hydraulic cylinder, must guarantee enough big pressure to awl dish-metal tape, energy loss is inevitably, is intrinsic characteristics of this pressurization and speed control system and shortcoming.This energy loss reaches 17.3% (according to Japan's 10～15 cycle calculations) or 12% (according to European NEDC cycle calculations) of total input energy.As can be seen from Figure 1, when speed changer stopped speed change, oil hydraulic pump was still in the work that does not stop, and the pressure oil that flows out from oil hydraulic pump 4 flows back to fuel tank 10 again through main pressure regulator valve 1, has caused unnecessary energy loss.Simultaneously, when speed change, if driving wheel oil hydraulic cylinder 8 is in oil condition, follower oil hydraulic cylinder 7 is in the oil-feed state, the pressure oil that driving wheel oil hydraulic cylinder 8 flows out all flows back to fuel tank 10 by Transmission Ratio Control valve 3, and this has also caused unnecessary energy loss.
The model utility content
At the above-mentioned deficiency of existing single pressure circuit hydraulic system, the utility model provides a kind of low energy consumption metal band type stepless speed variator hydraulic control circuit that big fuel-economizing potentiality, good economy performance are arranged.
The purpose of this utility model is achieved in that low energy consumption metal band type stepless speed variator hydraulic control circuit, it comprises oil hydraulic pump, main pressure regulator valve, the clamping force control valve, the Transmission Ratio Control valve, follower oil hydraulic cylinder and driving wheel oil hydraulic cylinder, the oil hydraulic pump inlet is connected with fuel tank by oil pipe, the Transmission Ratio Control valve is the 3-position-3-way valve with pressure feedback, three interfaces of Transmission Ratio Control valve are respectively by oil pipe and follower oil hydraulic cylinder, the driving wheel oil hydraulic cylinder is connected with fuel tank, it is characterized in that: main pressure regulator valve outlet connects the inlet of oil hydraulic pump by oil pipe, is provided with one-way valve on oil hydraulic pump and oil pipe that fuel tank is connected.
Further, the oil pipe of described Transmission Ratio Control valve connected tank is provided with relief valve, is provided with the inlet that oil pipe connects oil hydraulic pump between relief valve and Transmission Ratio Control valve.
Advantage of the present utility model is: when speed changer slows down or stops speed change, the pressure oil that will flow back to fuel tank in the hydraulic system is inserted the entry end of pump, thereby reduce to pump the pressure difference between the inlet, reach the purpose that reduces energy loss.
Description of drawings
Fig. 1-existing stepless speed variator hydraulic control circuit structural drawing;
Fig. 2-the utility model stepless speed variator hydraulic control circuit structural drawing.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
As shown in Figure 2, low energy consumption metal band type stepless speed variator hydraulic control circuit of the present utility model, it is made up of main pressure regulator valve 1, clamping force control valve 2, Transmission Ratio Control valve 3, oil hydraulic pump 4, relief valve 5, one-way valve 6, driven wheel oil hydraulic cylinder 7, driving wheel oil hydraulic cylinder 8 and motor 9.
Oil hydraulic pump 4 inlets are connected with fuel tank 10 by oil pipe, the 3-position-3-way valve of Transmission Ratio Control valve 3 for having pressure feedback, and three interfaces of Transmission Ratio Control valve 3 are connected with follower oil hydraulic cylinder 7, driving wheel oil hydraulic cylinder 8 and fuel tank 10 by oil pipe respectively.The outlet of main pressure regulator valve 1 connects the inlet of oil hydraulic pump 4 by oil pipe; Relief valve 5 is located on the oil pipe of Transmission Ratio Control valve connected tank, is provided with oil pipe between relief valve 5 and Transmission Ratio Control valve 3, and this oil pipe also connects the inlet of oil hydraulic pump 4.One-way valve 6 is located on oil hydraulic pump 4 and the oil pipe that fuel tank 10 is connected, and the pressure oil that this one-way valve 6 is come main pressure regulator valve 1 and Transmission Ratio Control valve 3 can only enter oil hydraulic pump 4, and can not flow to fuel tank 10.
The utility model has three control loops, and its composition function is as follows: (1) system pressure control loop: the system pressure control loop is made up of main pressure regulator valve 1, one-way valve 6 and oil hydraulic circuit, is come the outlet pressure of control pump by main pressure regulator valve 1; (2) clamping force control loop: the clamping force control loop is made up of clamping force control valve 2 and oil hydraulic circuit, is controlled the pressure of follower oil hydraulic cylinder by clamping force control valve 2; (3) Transmission Ratio Control loop: the Transmission Ratio Control loop is made up of Transmission Ratio Control valve 3, relief valve 5 and oil hydraulic circuit, is controlled the variation of transmission gear ratio by Transmission Ratio Control valve 3.Transmission Ratio Control valve 3 has three kinds of working conditions: (a) get when electric when Transmission Ratio Control valve 3 left ends, follower oil hydraulic cylinder 7 flows to pressure oil, a part of pressure oil of driving wheel oil hydraulic cylinder 8 then flows back to the inlet (having reduced the loss of this part pressure oil pressure) of oil hydraulic pump 4, unnecessary oil flows into fuel tank 10 through relief valve 5, realizes slowing down; (b) when Transmission Ratio Control valve 3 and clutch control valve all must not electricity, transmission gear ratio remained unchanged.The pressure oil of oil hydraulic pump 4 outlet flows back to the inlet of oil hydraulic pump 4 through main pressure regulator valve 1 with pressure oil, thereby has reduced oil hydraulic pump again from the energy of fuel tank 10 oil suctions institute many consumption; (c) get when electric when Transmission Ratio Control valve 3 right-hand members, 8 oil-feeds of driving wheel oil hydraulic cylinder, follower oil hydraulic cylinder 7 is fuel-displaced, and oil hydraulic pump 4, is realized quickening from fuel tank 10 oil suctions by one-way valve 6.
Claims (2)
1, low energy consumption metal band type stepless speed variator hydraulic control circuit, it comprises oil hydraulic pump (4), main pressure regulator valve (1), clamping force control valve (2), Transmission Ratio Control valve (3), follower oil hydraulic cylinder (7) and driving wheel oil hydraulic cylinder (8), oil hydraulic pump (4) inlet is connected with fuel tank (10) by oil pipe, Transmission Ratio Control valve (3) is the 3-position-3-way valve, three interfaces of Transmission Ratio Control valve (3) are respectively by oil pipe and follower oil hydraulic cylinder (7), driving wheel oil hydraulic cylinder (8) is connected with fuel tank (10), it is characterized in that: main pressure regulator valve (1) outlet connects the inlet of oil hydraulic pump (4) by oil pipe, is provided with one-way valve (6) on oil hydraulic pump and oil pipe that fuel tank is connected.
2, low energy consumption metal band type stepless speed variator hydraulic control circuit according to claim 1, it is characterized in that: the oil pipe of described Transmission Ratio Control valve (3) connected tank (10) is provided with relief valve (5), is provided with the inlet that oil pipe connects oil hydraulic pump (4) between relief valve (5) and Transmission Ratio Control valve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200990162U CN201306440Y (en) | 2008-12-16 | 2008-12-16 | Hydraulic control circuit for low-energy-consumption metal belt type continuously variable transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200990162U CN201306440Y (en) | 2008-12-16 | 2008-12-16 | Hydraulic control circuit for low-energy-consumption metal belt type continuously variable transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201306440Y true CN201306440Y (en) | 2009-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200990162U Expired - Fee Related CN201306440Y (en) | 2008-12-16 | 2008-12-16 | Hydraulic control circuit for low-energy-consumption metal belt type continuously variable transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201306440Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104343966A (en) * | 2013-07-29 | 2015-02-11 | 现代自动车株式会社 | Hydraulic pressure supply system of automatic transmission for vehicle |
| CN104633099A (en) * | 2015-02-17 | 2015-05-20 | 湖南江麓容大车辆传动股份有限公司 | Proportional hydraulic control valve set and metal-belt type stepless transmission |
-
2008
- 2008-12-16 CN CNU2008200990162U patent/CN201306440Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104343966A (en) * | 2013-07-29 | 2015-02-11 | 现代自动车株式会社 | Hydraulic pressure supply system of automatic transmission for vehicle |
| CN104343966B (en) * | 2013-07-29 | 2018-04-27 | 现代自动车株式会社 | Fluid pressure supply system for the automatic transmission of vehicle |
| CN104633099A (en) * | 2015-02-17 | 2015-05-20 | 湖南江麓容大车辆传动股份有限公司 | Proportional hydraulic control valve set and metal-belt type stepless transmission |
| CN104633099B (en) * | 2015-02-17 | 2016-10-05 | 湖南江麓容大车辆传动股份有限公司 | Proportional hydraulic control valve group and metal band type stepless speed variator |
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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: 20090909 Termination date: 20101216 |