CN201779249U

CN201779249U - Air-liquid gear-selecting and gear-shifting mechanism for electrically controlled mechanical automatic transmissions

Info

Publication number: CN201779249U
Application number: CN2010202998880U
Authority: CN
Inventors: 何仁; 姜博
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2010-08-20
Filing date: 2010-08-20
Publication date: 2011-03-30
Anticipated expiration: 2020-08-20

Abstract

The utility model discloses an air-liquid gear-selecting and gear-shifting mechanism for electrically controlled mechanical automatic transmissions. The left cavity of an air cylinder is connected with a two-position five-way electromagnetic valve, a stable air source is communicated with the air cylinder through the two-position five-way electromagnetic valve, the air cylinder and a pressure buildup oil cylinder are integrated together, the cavities of the air cylinder and the pressure buildup oil cylinder are communicated with each other, an air cylinder piston is connected with a pressure buildup oil cylinder piston through a piston-connecting rod, and the area of the air cylinder piston is larger than the area of the pressure buildup oil cylinder piston; the right cavity of the pressure buildup oil cylinder is communicated with an oil storage tank through a one-way valve and a filter; the right cavity of the pressure buildup oil cylinder is respectively connected with a gear-selecting electromagnetic valve bank and a gear-shifting electromagnetic valve bank through an oil outlet pipeline, and the gear-selecting electromagnetic valve bank and the gear-shifting electromagnetic valve bank are respectively connected with a gear-selecting oil cylinder and a gear-shifting oil cylinder. By controlling the direction of the airflow of the air cylinder, the air-liquid gear-selecting and gear-shifting mechanism charges oil into the oil cylinder, builds up the pressure of the pressure buildup oil cylinder, controls the oil intake and discharge of the gear-selecting oil cylinder or the gear-shifting oil cylinder, and reduces the impact of a synchronizing ring while accurately settling gears, so that the service life of a synchronizer can be prolonged.

Description

A kind of gas-liquid gear shift mechanism of electric control mechanical type automatic speed variator

Technical field

The utility model relates to the gas-liquid gear shift mechanism of electric control mechanical type automatic speed variator, is applied to the automotive transmission field.

Background technique

Along with the continuous development of drive technology, vehicle automatic transmission has become the inexorable trend of speed changer development, and automatic speed changing can alleviate driver's burden, the potential safety hazard that the minimizing driving fatigue causes, and has improved traffic safety; Moreover, present amateur driver is on the increase, and uses automatic transmission can reduce amateur driver's misoperation, can also make vehicle obtain good rideability and economic performance simultaneously, reduces the pollution to environment.Automatic gearbox mainly contains hydraulic automatic speed variator AT, electric control mechanical type automatic speed variator AMT, CVT (continuously variable transmission) CVT, double-clutch automatic gearbox DCT at present.Wherein, electric control mechanical type automatic speed variator AMT is on conventional manual speed changer basis, increases actuator, sensor and control unit TCU.The driver gives the instruction of TCU and sensor signal after TCU handles by handle etc., and TCU makes judgement, when being judged as shifting or clutch operating, then sends instruction, drives corresponding actuator, finishes the action of instruction indication.

Actuator can be divided into air pressure driving mechanism, hydraulic drive mechanism and motor-driven mechanism by the power source difference.At present, hydraulic drive mechanism has advantages such as control response is relatively good, ratio of precision is higher, driving force is big, good reliability, so hydraulic drive mechanism obtains widespread usage.But hydraulic drive mechanism needs from motor-drive pump to carrying out a series of hydraulic element such as cylinder, and this makes that the hydraulic drive mechanism cost is higher.And be extensive use of source of the gas on the commercial vehicle, on this basis, exploitation air pressure driving mechanism just can utilize air pump, the accumulator that carries on the car, is used widely on commercial vehicle for the consideration air pressure driving mechanism of cost.As driving medium, its cost is low with air for the air pressure driving mechanism, and does not have environmental pollution, and is also lower to the required precision of gas-pressure component.But because air compression is big, so the control accuracy of air pressure driving mechanism is not high, for Clutch Control the time, and the difficult accurate control that realizes cylinder location and speed.The also difficult accurate stop that realizes gear during shifting.Also there is the not enough problem of driving force in air pressure as power source, and needing increases effort-saving mechanism, thereby has strengthened the overall dimensions of air pressure driving mechanism.These problems are perplexing the development that air pressure drives electric control mechanical type automatic speed variator AMT always.

Traditional AMT air pressure actuator utilizes vehicle to carry source of the gas, only needs to increase solenoid valve and carries out cylinder.Though it is simple in structure, gas-pressure component is few, use air pressure to have some shortcomings as the direct power source of gear shift mechanism.Air pressure shift-selecting and changing actuating mechanism wherein often adopts multiposition cylinder and common switch electromagnetic valve, by the switching of a plurality of switch electromagnetic valves, realizes diverse location.Wherein the multiposition cylinder needs special design, can increase cost, and the multiposition cylinder is along with the increasing of stop position, and its length can increase, and is unfavorable for spatial arrangement.If adopt common cylinder, control valve servovalve then commonly used or Proportional valve, sleeve mechanism is had relatively high expectations for valve and cylinder, increases cost, and will realize that the accurate stop of gear is difficult with respect to hydraulic actuator in the short time.Traditional AMT hydraulic actuator independently motor-drive pump provides hydraulic oil, and sleeve mechanism also comprises fuel tank, filter, one-way valve, pressure relay, accumulator, some solenoid valves and carry out oil cylinder that a whole set of hydraulic actuator element is more.Wherein AMT hydraulic pressure gear shift mechanism also often adopts multiposition oil cylinder and common switch electromagnetic valve, the same shortcoming that employing multiposition cylinder is arranged with the air pressure gear shift mechanism.No matter be traditional air pressure gear shift mechanism or traditional hydraulic pressure gear shift mechanism, they all adopt common switch electromagnetic valve, adopt switch electromagnetic valve to determine that the process of gearshift is passive, this makes that the impact of friction ring engaging friction synchronization point is very big, and the life-span of friction ring is reduced.

Summary of the invention

The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, comprehensive air pressure drives and hydraulic driving advantage separately, for electric control mechanical type automatic speed variator AMT provides a kind of gas-liquid gear shift mechanism, improve the reliability of AMT shifting work, reduce synchronizer and impact, reduce system cost as far as possible.

The technological scheme that its technical problem that solves the utility model adopts is: the left chamber of cylinder connects two five-way electromagnetic valves, stablizing source of the gas is communicated with cylinder by two five-way electromagnetic valves, cylinder and build that compressing cylinder is combined into one and both intracavity inter-connections, the cylinder piston that cylinder inner cavity is provided with has cylinder to be divided into left and right two chambeies, the oil pressuring cylinder piston of building of building that the compressing cylinder inner chamber is provided with makes and builds compressing cylinder and have left and right two chambeies, cylinder piston and build oil pressuring cylinder piston and fuse by piston rod, the area of cylinder piston is greater than the area of building oil pressuring cylinder piston; The right chamber of building compressing cylinder is communicated with fuel reserve tank by one-way valve and filter; The right chamber of building compressing cylinder connects block selecting electromagnetic valve group and gearshift electromagnetic valve group respectively by fuel-displaced pipeline, and the block selecting electromagnetic valve group is connected block selecting oil cylinder and gearshift oil cylinder respectively with the gearshift electromagnetic valve group.

The beneficial effects of the utility model are:

1, the utility model all merges the advantage of air pressure and hydraulic pressure in same set of electric control mechanical type automatic speed variator AMT actuator, with respect to air pressure actuator, though increased some elements, can obtain the advantage of hydraulic control, improve the reliability of AMT driving mechanism work; With respect to hydraulic actuator, when enjoying same control advantage, reduced the number of elements of sleeve mechanism, reduced manufacture cost.Advantage by vehicle band source of the gas, utilize this source of the gas build-up pressure oil, control by the cylinder airflow direction, realization is built the oil-filled of compressing cylinder and is built pressure, and there is the area ratio in two-piston, therefore air pressure that can be enough very little obtains to satisfy the required high-voltage oil liquid of actuator, has saved mechanisms such as motor-drive pump, pressure relay and accumulator, and has utilized fluid easily to realize Accurate Position Control.

2, shift-selecting and changing actuating mechanism of the present utility model is selected ordinary cylinder, just can realize many gears selections by control.The shifting solenoid valve is high-speed switch valve.Control unit TCU as feedback signal, by regulating the high-speed switch valve PWM signal dutycycle, realizes block selecting or control that the gearshift oil cylinder advances the oil extraction oil mass with the displacement of shifting oil cylinder piston, and then realizes the accurate stop of gear.During gearshift,, guarantee that the gear stop reduces synchronizing ring accurately simultaneously and impacts, help prolonging the synchronizer life-span by high-speed switch valve being advanced the control of oil drain quantity,

3, the utility model is equally applicable to clutch actuating mechanism, and the oil pressure that clutch actuating mechanism can utilize source of the gas to set up is realized the accurate control of clutch displacement and speed by closed loop control.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Among the figure: 1. cylinder; 2. build compressing cylinder; 3. fuel reserve tank; 4. filter; 5. one-way valve; 6. two five-way electromagnetic valves; 7. block selecting electromagnetic valve group; 8. gearshift electromagnetic valve group; 9. block selecting oil cylinder; 10. gearshift oil cylinder; 11. fuel-displaced pipeline; 12. return line; 13. pipeline; 14,15. magnetic switchs: a. cylinder piston; B. build oil pressuring cylinder piston; C. piston rod.

Embodiment

As shown in Figure 1, cylinder 1 and build compressing cylinder 2 and be combined into one, cylinder 1 and build the intracavity inter-connection of compressing cylinder 2.The inner chamber of cylinder 1 is provided with cylinder piston a, cylinder piston a is divided into left and right two chambeies with cylinder 1, build compressing cylinder 2 inner chambers and be provided with and build oil pressuring cylinder piston b, build oil pressuring cylinder piston b and will build compressing cylinder 2 and be divided into left and right two chambeies, and cylinder piston a and build oil pressuring cylinder piston b and all have magnetic.Cylinder piston a and build oil pressuring cylinder piston b and connect as one by piston rod c, and cylinder piston a and build oil pressuring cylinder piston b and have the area ratio, the area of cylinder piston a is greater than the area of building oil pressuring cylinder piston b.The left chamber of cylinder 1 connects 6, two five-way electromagnetic valves of two five-way electromagnetic valves, 6 external stable sources of the gas, stablizes source of the gas and is communicated with cylinder 1 by two five-way electromagnetic valves 6, makes to stablize source of the gas by two five-way electromagnetic valves, 6 driving cylinders 1.

The right chamber of building compressing cylinder 2 is communicated with fuel reserve tanks 3 by one-way valve 5 and filter 4, fuel reserve tank 3 and build and be provided with one-way valve 5 between the compressing cylinder 2, and fuel reserve tank 3 provides sufficient fluid for the right chamber of building compressing cylinder 2, and high pressure oil can not be scurried into fuel reserve tank 3.Following two five-way electromagnetic valves, 6 outages of normal state, stable source of the gas leads to the left chamber of cylinder 1, and the right chamber of cylinder 1 communicates with atmosphere, and cylinder piston a is under the effect of atmospheric pressure, promote to build oil pressuring cylinder piston b by piston rod c, thereby in building compressing cylinder 2 right chambeies, set up oil pressure.When 6 energisings of two five-way electromagnetic valves, when making that stablize source of the gas leads to the right chamber of cylinder 1, cylinder 1 left chamber communicates with atmosphere, so build oil pressuring cylinder piston b to left movement, cause building compressing cylinder 2 internal pressures less than barometric pressure, build compressing cylinder 2 thereby fuel reserve tank 3 inner fluids process filter 4 and one-way valve 5 enter.

Build the infiltration of the left chamber existence of compressing cylinder 2 from right chamber fluid, and as cylinder piston a, build piston rod group that oil pressuring cylinder piston b, piston rod c form when moving to left, the left chamber of building compressing cylinder 2 will keep communicating with atmosphere, therefore the left chamber that will build compressing cylinder 2 links to each other air by pipeline 13 with the reservoir port O2 of fuel reserve tank 3, fuel reserve tank 3 communicates with atmosphere by another reservoir port O1.The height of fuel reserve tank 3 maximum oil liquid measures will be lower than the height of reservoir port O2.

The right chamber of building compressing cylinder 2 is by fuel-displaced pipeline 11 output high pressure oils, fuel-displaced pipeline 11 connects block selecting electromagnetic valve group 7 and gearshift electromagnetic valve group 8 respectively, block selecting electromagnetic valve group 7 is connected block selecting oil cylinder 9 and gearshift oil cylinder 10 respectively with gearshift electromagnetic valve group 8, build compressing cylinder 2 by 11 pairs of block selecting electromagnetic valve group of fuel-displaced pipeline 7 and gearshift electromagnetic valve group 8 output high pressure oils, high pressure oil drives block selecting oil cylinder 9 by block selecting electromagnetic valve group 7, high pressure oil drives gearshift oil cylinder 10 by gearshift electromagnetic valve group 8, block selecting oil cylinder 9 and gearshift oil cylinder 10 are ordinary cylinder, and block selecting electromagnetic valve group 7 and gearshift electromagnetic valve group 8 all are high-speed switch valves.By block selecting electromagnetic valve group 7 and gearshift electromagnetic valve group 8 and return line 12 connection fuel reserve tanks 3, fluid returns fuel reserve tank 3 through return line 12 respectively for block selecting oil cylinder 9 and gearshift oil cylinder 10.Block selecting electromagnetic valve group 7 and gearshift electromagnetic valve group 8 be by the oil-feed oil mass of pwm signal control block selecting oil cylinder 9 and gearshift oil cylinder 10, thereby realize the accurate stop to block selecting and drive range, and synchronizer impacts when reducing to shift gears.

Magnetic switch 15 is set outside cylinder 1, and the position of the position of magnetic switch 15 and cylinder piston a is corresponding, and another magnetic switch 14 is set outside building compressing cylinder 2, and the position of another magnetic switch 14 is corresponding with the position of building oil pressuring cylinder piston b.The hydraulic pressure oil mass that the utility model is set up can guarantee that at least actuator finishes a workflow (shifting and clutch separation in conjunction with), and builds compressing cylinder 2 and build and press a time very short.Block selecting oil cylinder 9, gearshift oil cylinder 10 and clutch are carried out oil cylinder can use the oil pressure of building in the compressing cylinder 2 at any time.Shifting and clutch action flow process finish back two five-way electromagnetic valves, 6 energisings, cylinder piston a is moved to left, and then build compressing cylinder 2 and charge into fluid, up to building the position that oil pressuring cylinder piston b arrives magnetic switch 14, build compressing cylinder 2 this moment and recover sufficient fluid state, magnetic switch 15 also can be given triggering of control unit TCU simultaneously, and TCU makes 6 outages of two five-way electromagnetic valves reply normality after receiving this triggering immediately, thereby sets up oil pressure.This pressure is directly proportional with bleed pressure, and more stable.Magnetic switch 14 guarantees the safe and reliable and fault diagnosis effect of system works.The hydraulic oil of setting up since too for a long time not gearshift can penetrate into and build oil pressuring cylinder piston b left side, can cause the pressure oil oil mass on its right side can't finish a work cycle.The direction of building oil pressuring cylinder piston b meeting magnetropism switch 14 in this process moves.Move to magnetic switch 14 places when building oil pressuring cylinder piston b, TCU can receive a triggering, and this moment, TCU made 6 energisings of two five-way electromagnetic valves immediately, and source of the gas is connected in cylinder 1 right chamber, and left chamber connects atmosphere, finishes repairing; TCU can judge whether oil cylinder exists the fault leakage of oil from the time lag that twice magnetic switch 14 works, and weak point then is the fault leakage of oil at interval.Magnetic switch 14 is in masked state generally speaking, because set up in the oil-filled process in action such as shifting or clutch or two five-way electromagnetic valves 6 energisings, builds oil pressuring cylinder piston b and can pass through magnetic switch 14 equally.Under the both of these case, magnetic switch 14 is shielded for the triggering of TCU by TCU.

Claims

1. the gas-liquid gear shift mechanism of an electric control mechanical type automatic speed variator, the left chamber of cylinder (1) connects two five-way electromagnetic valves (6), stablizing source of the gas is communicated with cylinder (1) by two five-way electromagnetic valves (6), it is characterized in that: described cylinder (1) and build compressing cylinder (2) and be combined into one and both intracavity inter-connections, the cylinder piston (a) that cylinder (1) inner chamber is provided with makes cylinder (1) have the left side of being divided into, right two chambeies, the oil pressuring cylinder piston (b) of building of building that compressing cylinder (2) inner chamber is provided with makes and builds compressing cylinder (2) and have a left side, right two chambeies, cylinder piston (a) and build oil pressuring cylinder piston (b) and fuse by piston rod (c), the area of cylinder piston (a) is greater than the area of building oil pressuring cylinder piston (b); The right chamber of building compressing cylinder (2) is communicated with fuel reserve tank (3) by one-way valve (5) and filter (4); The right chamber of building compressing cylinder (2) connects block selecting electromagnetic valve group (7) and gearshift electromagnetic valve group (8) respectively by fuel-displaced pipeline (11), and block selecting electromagnetic valve group (7) is connected block selecting oil cylinder (9) and gearshift oil cylinder (10) respectively with gearshift electromagnetic valve group (8).

2. the gas-liquid gear shift mechanism of a kind of electric control mechanical type automatic speed variator according to claim 1, it is characterized in that: described cylinder piston (a) and build oil pressuring cylinder piston (b) and all have magnetic, be outside equipped with and the corresponding magnetic switch in cylinder piston (a) position (15) at cylinder (1), be outside equipped with and build corresponding another magnetic switch (14) in oil pressuring cylinder piston (b) position building compressing cylinder (2).

3. the gas-liquid gear shift mechanism of a kind of electric control mechanical type automatic speed variator according to claim 1, it is characterized in that: build the reservoir port (O2) of the left chamber of compressing cylinder (2) by pipeline (13) connection fuel reserve tank (3), the height of fuel reserve tank (3) maximum oil liquid measure is lower than the height of reservoir port (O2).

4. the gas-liquid gear shift mechanism of a kind of electric control mechanical type automatic speed variator according to claim 1 is characterized in that: block selecting oil cylinder (9) and gearshift oil cylinder (10) are respectively by block selecting electromagnetic valve group (7) and shift gears electromagnetic valve group (8) and return line (12) connection fuel reserve tank (3).