CN108730508B - Electro-mechanical-hydraulic force-increasing type gear shifting mechanism for transmission - Google Patents
Electro-mechanical-hydraulic force-increasing type gear shifting mechanism for transmission Download PDFInfo
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- CN108730508B CN108730508B CN201810967485.XA CN201810967485A CN108730508B CN 108730508 B CN108730508 B CN 108730508B CN 201810967485 A CN201810967485 A CN 201810967485A CN 108730508 B CN108730508 B CN 108730508B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 34
- 230000007246 mechanism Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 238000013459 approach Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 230000003139 buffering effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 122
- 230000033001 locomotion Effects 0.000 description 8
- 230000001965 increasing effect Effects 0.000 description 7
- 238000007789 sealing Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000006173 Good's buffer Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/26—Generation or transmission of movements for final actuating mechanisms
- F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
- F16H61/32—Electric motors actuators or related electrical control means therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/26—Generation or transmission of movements for final actuating mechanisms
- F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
- F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Actuator (AREA)
Abstract
The invention discloses an electromechanical liquid boosting type gear shifting mechanism for a transmission, which comprises an energy accumulator, wherein the energy accumulator comprises an energy accumulator shell, a driving motor, an oil storage device and a piston push rod; an oil cavity is formed in the accumulator shell and used for containing oil, a first oil port and a second oil port are formed in the shell, and an oil duct is connected to the first oil port; the output shaft of the driving motor is arranged in the oil cavity, the output shaft of the driving motor is provided with a piston matched with the oil cavity, and the piston is used for extruding oil in the oil cavity to an oil duct under the pushing of the driving motor; the movable piston push rod is arranged at the oil duct and is used for moving to push an executive component in the speed changer when receiving oil pressure; the oil reservoir is communicated with the oil cavity through a second oil port, and the second oil port can be conducted or closed when the piston moves back and forth. The invention has the advantages of low cost, simple structure and good buffering performance.
Description
Technical Field
The invention relates to the field of transmissions, in particular to an electro-mechanical hydraulic power-increasing type gear shifting mechanism for a transmission.
Background
To achieve automatic shifting of a transmission, various principles of shift mechanisms are applied. Such as the CN201710059234 patent, hydraulic systems are adopted, which include oil cylinders, oil pumps, reversing valves, filters, hydraulic cylinders, etc., and such systems are complex in structure and high in cost. For example, in CN 201710390585.6, a dual motor, a gear-selecting angular displacement sensor, a gear-shifting angular sensor and a corresponding mechanical transmission mechanism are used to realize gear-selecting and gear-shifting operations of the AMT, and the cost is also high. Also, as in patent 201510289991.4, the shift of the parallel axis gear system is performed by using an electromagnetic operating mechanism, but the electromagnetic clutch cannot effectively control the shift time, and the problem of shock is likely to occur.
Disclosure of Invention
Therefore, it is necessary to provide an electro-mechanical hydraulic booster type gear shifting mechanism for a transmission, so as to solve the problems of high cost, complex structure and easy occurrence of impact during gear shifting of the gear shifting mechanism in the prior art.
In order to achieve the above object, the present inventors provide an electro-mechanical hydraulic power-assisted shift mechanism for a transmission, including an accumulator housing, a driving motor, an oil reservoir, and a piston rod;
an oil cavity is formed in the energy accumulator shell and used for containing oil, a first oil port and a second oil port are formed in the energy accumulator shell, and an oil duct is connected to the first oil port;
the output shaft of the driving motor is arranged in the oil cavity, the output shaft of the driving motor is provided with a piston matched with the oil cavity, and the piston is used for extruding oil in the oil cavity to an oil duct under the pushing of the driving motor;
the movable piston push rod is arranged at the oil duct and is used for moving to push an executive component in the speed changer when receiving oil pressure;
the oil reservoir is communicated with the oil cavity through a second oil port, and the second oil port can be conducted or closed when the piston moves back and forth.
Further, the driving motor is a linear motor, and an output shaft of the linear motor is connected with the piston.
Further, the driving motor is a screw motor, and the piston is sleeved at the screw of the screw motor; the screw rod sleeve of the screw rod motor is provided with a screw rod nut, and the screw rod nut is propped against the piston and is used for pushing the piston when the screw rod rotates.
Further, an elastic piece is further arranged between the screw nut and the piston, and the elastic piece can be compressed when the screw nut is close to the piston and can be stretched when the screw nut is far away from the piston, so that thrust or pressure is relieved.
Further, the elastic piece is a spring or a shrapnel.
Further, a clamping ring is sleeved at the screw rod, and the clamping ring is arranged between the screw rod nut and the screw rod motor shell.
Further, the device also comprises a driving motor controller and an oil pressure sensor, wherein the driving motor controller is connected with the driving motor and used for controlling the turning degree and the torsion of the driving motor in the starting and stopping processes and the working process; the oil pressure sensor is arranged at the inner wall of the oil cavity and is connected with the driving motor controller and used for detecting the oil pressure in the oil cavity of the energy accumulator.
Further, the piston sleeve is provided with a piston sealing ring, and the piston push rod sleeve is provided with a piston push rod sealing ring.
The electromechanical hydraulic booster type gear shifting mechanism for the transmission comprises an energy accumulator, wherein the energy accumulator comprises an energy accumulator shell, a driving motor, an oil storage device and a piston push rod; an oil cavity is formed in the accumulator shell and used for containing oil, a first oil port and a second oil port are formed in the shell, and an oil duct is connected to the first oil port; the output shaft of the driving motor is arranged in the oil cavity, the output shaft of the driving motor is provided with a piston matched with the oil cavity, and the piston is used for extruding oil in the oil cavity to an oil duct under the pushing of the driving motor; the movable piston push rod is arranged at the oil duct and is used for moving to push an executive component in the speed changer when receiving oil pressure; the oil reservoir is communicated with the oil cavity through a second oil port, and the second oil port can be conducted or closed when the piston moves back and forth. The arrangement can achieve the effect of high thrust output by using the low-power motor, the thrust of oil pressure has good buffer performance, the gear shifting process is smoother, the structure is compact, the transplanting application is easy, the cost is low, and the reliability is high.
Drawings
FIG. 1 is a schematic illustration of operation of an electro-mechanical hydraulic power shift mechanism for a transmission in accordance with an embodiment of the present invention;
fig. 2 is a second schematic operation diagram of an electro-hydraulic power-type shift mechanism for a transmission according to an embodiment of the present invention.
Reference numerals illustrate:
1. a driving motor;
2. a screw rod;
3. an accumulator housing;
4. an elastic member;
5. a first oil port;
6. a screw nut;
7. an oil pressure sensor;
8. a piston seal ring;
9. a piston push rod sealing ring;
10. a piston push rod;
11. a clasp;
12. a piston;
13. a second oil port;
14. an oil passage.
Detailed Description
In order to describe the technical content, constructional features, achieved objects and effects of the technical solution in detail, the following description is made in connection with the specific embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 and 2, the present invention provides an electro-mechanical and hydraulic power shift mechanism for a transmission for automatic shifting.
In a specific embodiment, the electro-mechanical hydraulic power-assisted shifting mechanism for a transmission comprises an accumulator, which comprises an accumulator housing 3, a drive motor 1, an oil reservoir and a piston rod 10. The accumulator is used for generating and storing pressure, the oil storage is used for storing oil and releasing pressure, and the piston push rod 10 applies pressure to an actuating element of the transmission under the action of the accumulator.
An oil cavity is formed in the accumulator shell 3 and used for containing oil, a first oil port 5 and a second oil port 13 are formed in the accumulator shell 3, and an oil duct 14 is connected to the second oil port 13. The output shaft of the driving motor 1 is arranged in the oil cavity, the output shaft of the driving motor 1 is provided with a piston 12 matched with the oil cavity, the piston 12 can move back and forth along the inner wall of the oil cavity in the oil cavity, the side face of the piston 12 is completely attached to the inner side wall of the oil cavity, the piston 12 can extrude oil in the oil cavity to the oil duct 14 under the pushing of the driving motor 1, the pressure in the oil cavity is increased, the oil pressure in the oil cavity is increased, the increased oil pressure can act on the push rod piston, and the push rod piston can apply pressure to the outside.
The movable piston push rod 10 is arranged at the oil duct 14, the side surface of the push rod piston is completely attached to the inner side wall of the oil duct 14, oil in the oil cavity is prevented from overflowing, pressure cannot be formed in the oil cavity, the piston push rod 10 can reciprocate in the oil duct 14 under the action of oil pressure, and the piston push rod 10 moves to apply pressure to an executive component of the transmission when receiving the oil pressure on the premise of sealing the oil duct 14. The oil reservoir is communicated with the oil cavity of the energy accumulator through the first oil port 5, the first oil port 5 can be conducted or closed when the piston 12 moves back and forth, after the first oil port 5 is closed, the pressure in the oil cavity can be increased due to continuous extrusion of the piston 12, after the first oil port 5 is conducted, the oil cavity is communicated with the oil reservoir, and the pressure in the oil cavity can be rapidly reduced to be free.
When the driving motor 1 rotates positively, the output shaft of the driving motor 1 acts on the piston 12, so that the piston 12 moves away from the driving motor 1 to squeeze oil in the oil cavity, after the piston 12 moves to the first oil port 5, the first oil port 5 is sealed, the piston 12 continues to move away from the driving motor 1, the oil in the oil cavity is squeezed, the pressure in the oil cavity becomes large, the oil in the oil cavity becomes pressurized and is squeezed into the oil duct 14 to push the piston push rod 10 to move away from the second oil port 13 until the piston push rod 10 touches an actuating element of the transmission, the piston push rod 10 continues to move, and at the moment, the piston push rod 10 applies pressure to the actuating element of the transmission; when the driving motor 1 rotates reversely, the output shaft of the driving motor 1 moves along with the piston in a direction away from the first oil port 5 until the piston 12 does not seal the first oil port 5, the first oil port 5 is conducted, the pressure in the oil cavity becomes small, the oil in the oil duct 14 returns to the oil cavity, the pressure acting on the piston push rod 10 disappears, the piston push rod 10 does not gradually press an actuating element of the transmission, finally the actuating element of the transmission acts on the piston push rod 10, and the piston push rod 10 approaches to the second oil port 13.
In a further embodiment, in order to implement the linear reciprocating motion of the pushing piston 12, the driving motor 1 may be a linear motor, and an output shaft of the linear motor is connected to the piston 12. When the linear motor rotates positively, the output shaft of the linear motor extends to drive the piston 12 to move away from the driving motor 1, and when the linear motor rotates reversely, the output shaft of the linear motor shortens to drive the piston 12 to move close to the driving motor 1, so that the arrangement can realize linear reciprocating movement of the piston 12.
In another embodiment, the driving motor 1 may also be a screw motor, which is also called a screw stepper motor, or a linear stepper motor, and is rotated by a magnetic rotor core through interaction with a pulse electromagnetic field generated by a stator, and the screw motor converts rotary motion into linear motion inside the motor. The output shaft of the screw motor is a screw rod 2, and the piston 12 is sleeved at the end part of the screw rod 2 of the screw rod motor; the screw rod 2 of the screw rod motor is sleeved with the screw rod nut 6, the screw rod nut 6 abuts against the piston 12, when the screw rod 2 of the screw rod motor rotates, the screw rod nut 6 moves back and forth along the threads of the screw rod 2, so that the rotating motion of the screw rod 2 can be converted into linear reciprocating motion of the screw rod nut 6, and the screw rod nut 6 can push the piston 12 to move when the screw rod 2 rotates. Specifically, the screw nut 6 is limited on the screw 2 of the screw motor by the snap ring 11, so that the screw nut 6 can relatively rotate along the thread of the screw 2 of the screw motor, and the screw nut 6 can be displaced.
In a further embodiment, an elastic member 4 is further disposed between the screw nut 6 and the piston 12, and the screw nut 6 and the piston 12 are respectively located at two end surfaces of the elastic member 4 in the extending direction, specifically, the elastic member 4 is a spring or a shrapnel. The elastic piece 4 can be compressed when the screw nut 6 is close to the piston 12, and respectively acts on the screw nut 6 and the piston 12 by elastic force generated by compression, so as to slow down thrust or pressure, and prevent the impact force generated when the gear shifting mechanism acts on the pressure of the transmission from increasing suddenly.
In order to prevent oil in the oil chamber from leaking out of the gap between the piston 12 and the accumulator housing, in a further embodiment the piston 12 is sheathed with a piston sealing ring 8 and the piston rod 10 is sheathed with a piston rod sealing ring 9.
The working process of the gear shifting mechanism is described below by taking a screw motor as a driving motor 1 as an example:
(1) The piston rod 10 is forced to operate (from the state of fig. 1 to the state of fig. 2): the screw motor drives the screw to rotate clockwise, the screw nut 6 moves rightwards under the action of the screw thread, and the elastic piece 4 moves rightwards along with the movement of the screw nut 6, and the piston 12 moves rightwards while the elastic piece 4 is deformed under pressure. After the piston 12 has moved to the right to close the first port 5, the hydraulic oil on the right side thereof is pressurized to form pressurized oil. The pressure oil pushes the piston push rod 10 to move right to do work outwards, so that thrust force can be formed to act on actuating elements such as a gear shifting brake or a clutch in the transmission. In the working process, a power source composed of a screw motor, a screw rod 2 and a screw rod nut 6 can provide the original thrust Fm of the actuator; fm acts on the piston 12 to enable the right oil pressure P=Fm/S1 (S1 is the cross-sectional area of the piston 12), and according to Pascal law, namely the pressure of each part of liquid is consistent, fs=PxS2=Fm x S2/S1 (S2 is the cross-sectional area of the oil cavity of the piston push rod 10), namely the pushing force Fs of the piston push rod 10 is increased by S2/S1 times compared with the original pushing force Fm of an actuator, so that the force increasing effect is achieved. Due to the self-locking effect of the screw nut 6, the motor can stop outputting torque outwards, and the gear shifting mechanism can provide stable static thrust acting on the gear shifting executing element.
(2) The return movement process of the piston push rod 10 (the state of fig. 2 is changed into fig. 1): the screw motor drives the screw rod 2 to rotate anticlockwise, and the screw nut 6 moves leftwards under the action of threads. As the lead screw nut 6 moves to the left, the elastic member 4 starts to stretch and deform, and the piston 12 gradually moves to the left. After the screw nut 6 further moves to the clamping ring 11, the whole piston 12 is driven to move left, and as the piston 12 is conducted to the first oil port 5, the liquid oil on the right side of the piston is decompressed. In this process, the piston rod 10 moves left because the left-side hydraulic oil volume becomes larger to form negative pressure, and no work is done to the outside. The actuating elements such as a shift brake or clutch in the transmission are in a released state.
In a further embodiment, the device also comprises a driving motor controller and an oil pressure sensor 7, wherein the driving motor controller is connected with the driving motor 1 and is used for controlling the turning degree and the torsion force in the starting, stopping and working processes of the driving motor 1; the oil pressure sensor 7 is arranged at the inner wall of the oil cavity, and the oil pressure sensor 7 is connected with the driving motor controller and used for detecting the oil pressure in the oil cavity of the energy accumulator. Therefore, the oil pressure signal of the pressure sensor can be utilized, the driving motor controller can realize automatic adjustment of the working stroke of the driving motor 1, the stability of the output thrust force Fs of the gear shifting mechanism can be ensured, even if an executive component in the transmission is worn to a certain extent, the enough unchanged pressing force Fs is ensured, and the gear shifting consistency in the gear shifting process of the transmission can be ensured.
It should be noted that, although the foregoing embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concepts of the present invention, alterations and modifications to the embodiments described herein, or equivalent structures or equivalent flow transformations made by the present description and drawings, apply the above technical solution, directly or indirectly, to other relevant technical fields, all of which are included in the scope of the invention.
Claims (8)
1. An electromechanical hydraulic booster type gear shifting mechanism for a transmission is characterized by comprising an energy accumulator, wherein the energy accumulator comprises an energy accumulator shell, a driving motor, an oil storage device and a piston push rod;
an oil cavity is formed in the energy accumulator shell and used for containing oil, a first oil port and a second oil port are formed in the energy accumulator shell, and an oil duct is connected to the second oil port;
the output shaft of the driving motor is arranged in the oil cavity, the output shaft of the driving motor is provided with a piston matched with the oil cavity, and the piston is used for extruding oil in the oil cavity to an oil duct under the pushing of the driving motor;
the movable piston push rod is arranged at the oil duct and is used for moving to push an executive component in the speed changer when receiving oil pressure;
the oil storage device is communicated with the oil cavity through a first oil port, and the first oil port can be conducted or closed when the piston moves back and forth;
when the driving motor rotates positively, the output shaft of the driving motor acts on the piston, so that the piston moves away from the driving motor to extrude oil in the oil cavity, after the piston moves to the first oil port, the first oil port is sealed, the piston continues to move away from the driving motor to extrude the oil in the oil cavity, the pressure in the oil cavity becomes high, the oil in the oil cavity becomes pressurized and is extruded into the oil duct to push the piston push rod to move away from the second oil port until the piston push rod touches an executive element of the transmission, the piston push rod continues to move, and the piston push rod applies pressure to the executive element of the transmission;
when the driving motor rotates reversely, the output shaft of the driving motor drives the piston to move along the direction away from the first oil port until the piston does not seal the first oil port, the first oil port is communicated, the pressure in the oil cavity is reduced, the oil in the oil duct returns to the oil cavity, the pressure acting on the piston push rod disappears, the actuating element of the speed changer acts on the piston push rod, and the piston push rod approaches to the second oil port;
the accumulator also includes a drive motor controller and an oil pressure sensor.
2. The electro-mechanical and hydraulic power shift mechanism for a transmission of claim 1, wherein the drive motor is a linear motor having an output shaft coupled to a piston.
3. The electro-mechanical hydraulic power-assisted shifting mechanism for a transmission according to claim 1, wherein the driving motor is a screw motor, and the piston is sleeved at a screw of the screw motor; the screw rod sleeve of the screw rod motor is provided with a screw rod nut, and the screw rod nut is propped against the piston and is used for pushing the piston when the screw rod rotates.
4. An electro-mechanical hydraulic power shift mechanism for a transmission as claimed in claim 3, wherein an elastic member is further provided between the screw nut and the piston, the elastic member being compressible when the screw nut approaches the piston and being extendable when the screw nut is away from the piston for reducing thrust or pressure.
5. The electro-mechanical and hydraulic power shift mechanism for a transmission of claim 4, wherein the resilient member is a spring or a leaf spring.
6. The electro-mechanical and hydraulic power-assisted shifting mechanism for a transmission according to claim 3, wherein a snap ring is further sleeved at the screw rod, and the snap ring is arranged between the screw rod nut and the screw rod motor housing.
7. The electro-mechanical hydraulic power-assisted shifting mechanism for a transmission according to claim 1, wherein the driving motor controller is connected with a driving motor for controlling the turning degree and torque force during the starting, stopping and working processes of the driving motor; the oil pressure sensor is arranged at the inner wall of the oil cavity and is connected with the driving motor controller and used for detecting the oil pressure in the oil cavity of the energy accumulator.
8. An electro-mechanical hydraulic power shift mechanism for a transmission as claimed in claim 1, wherein the piston sleeve is provided with a piston seal and the piston push rod sleeve is provided with a piston push rod seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810967485.XA CN108730508B (en) | 2018-08-23 | 2018-08-23 | Electro-mechanical-hydraulic force-increasing type gear shifting mechanism for transmission |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810967485.XA CN108730508B (en) | 2018-08-23 | 2018-08-23 | Electro-mechanical-hydraulic force-increasing type gear shifting mechanism for transmission |
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| Publication Number | Publication Date |
|---|---|
| CN108730508A CN108730508A (en) | 2018-11-02 |
| CN108730508B true CN108730508B (en) | 2023-12-05 |
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| CN201810967485.XA Active CN108730508B (en) | 2018-08-23 | 2018-08-23 | Electro-mechanical-hydraulic force-increasing type gear shifting mechanism for transmission |
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