Electric gear shifting executing mechanism capable of storing energy

Abstract

The utility model relates to an electric gear shifting execution mechanism, in particular to an electric gear shifting execution mechanism capable of storing energy, and solves the problems that an energy storage device of an existing automatic transmission is complex in structure, large in machining difficulty and high in requirement for forward and reverse efficiency of a ball screw assembly. The gear shifting assembly is matched with the movement assembly, the torque of the gear shifting motor is transmitted to the gear shifting block, the sensor assembly detects the position of the gear shifting block and transmits position information to the gear shifting motor, and the gear shifting motor adjusts the position of the gear shifting block according to the position information. Two springs of the energy storage assembly are used for preloading a nut and providing neutral gear positioning force, so that overshoot is avoided; during gear shifting, when the nut moves in the direction of the first spring, the first spring is compressed to store energy, and the second spring releases pre-compressed energy, so that the gear taking-off response speed is higher, the power interruption time is shortened, and secondary impact during gear entering is avoided.

Description

Technical Field

[0001] The utility model relates to an electric gear shift execution structure, in particular to an electric gear shift execution mechanism capable of storing energy. Background Art

[0002] Automatic transmissions such as AMT and pure electric transmissions have gradually become the mainstream of the market due to their easy operation and good economy. The actuators of automatic transmissions are mainly divided into two categories: electronically controlled electric and electronically controlled pneumatic. Electronically controlled pneumatic actuators cannot work on platforms that use liquid brakes and do not provide air sources for the entire vehicle, so electronically controlled electric actuators have gradually become the mainstream actuators. In addition, electronically controlled electric actuators also have many advantages such as adjustable shift force, adjustable selection / shift travel, small shift impact, strong versatility, and high compatibility. Therefore, the development of matching electronically controlled electric actuators has important market significance.

[0003] When using an automatic shifting transmission with an electronically controlled electric actuator for shifting, the gear-in process is generally actively regulated by the motor at the front end of the transmission, so that there is a certain range of speed difference between the target gear engagement ring speed and the engagement sleeve speed. Because there is a speed difference between the two, in order to reduce the secondary impact of shifting caused by the direct collision between the engagement sleeve and the engagement ring, the selection of the gear-in force should be able to ensure successful gear-in, short gear-in time and small gear-in impact, generally 300-500N, and should not be too large. The gear-out process is actively cleared by the motor at the front end of the transmission, so that the torque transmitted by the engagement sleeve is reduced to a certain range, and then a larger gear-out force is used to quickly remove the gear. In order to shorten the power interruption time as much as possible, buy time for the motor speed regulation of the next round of gear shifting process, and make the overall power interruption feel slight, the gear-out force is generally 800-1000N, and should not be too small. This requires an energy storage device to optimize the smoothness of gear shifting and effectively ensure the gear shifting speed. The Chinese utility model patent with the announcement number CN206703973U discloses an electric vehicle wire-controlled automatic transmission energy storage device, which includes an electric motor and a wire-controlled automatic transmission assembly, a gear transmission box and an energy storage conversion unit. In the process of recovering braking energy, the braking deceleration motion of the electric vehicle is converted into the rotational motion of the ball screw of the energy storage conversion unit through the transmission of the dual-clutch transmission box, and the compressed energy storage spring is converted into elastic potential energy; in the process of releasing braking energy, the elastic potential energy recovered by the compression spring of the energy storage conversion unit is converted into the rotational motion of the ball screw, which is driven by the dual-clutch transmission box to drive the electric vehicle to start and accelerate, thereby realizing the regeneration of braking energy. It has the advantages of compact structure, high energy conversion rate, reliable performance, etc., but its structure is complex, the processing is difficult, and it puts forward and reverse efficiencies of the ball screw assembly. The diameter of the screw rod cannot be too large and the lead cannot be too small, so the strength of the screw rod is reduced and the working space becomes larger, which is not conducive to the efficient use of the chassis space. Utility Model Content

[0004] The utility model aims to solve the technical problems of the existing automatic transmission energy storage device having a complex structure, great processing difficulty and high requirements on the forward and reverse efficiency of the ball screw assembly, and to provide an electric shift actuator capable of storing energy.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An electric gear shift actuator capable of storing energy, which is special in that it comprises a housing and two electric gear shift actuator units with the same structure, wherein the electric gear shift actuator units comprise a motion component, an energy storage component, a gear shift component and a sensor component;

[0007] The motion assembly includes a shift motor, a screw rod and a nut; the shift motor is arranged at one end of the housing, and the output shaft of the shift motor extends into the housing; the screw rod is connected to the output shaft of the shift motor, and the nut is screwed onto the screw rod;

[0008] The shift assembly comprises a shift head and a pivot arranged in a housing, wherein the pivot is located below the screw and fixedly connected to the housing, and the axis of the pivot is perpendicular to the axis of the screw; the shift head is arranged correspondingly to the nut, and an axial hole is arranged in the middle of the shift head, and the pivot is located in the axial hole; a U-shaped groove is opened on the upper part of the shift head, and a pin adapted to the U-shaped groove is arranged on the outer wall of the nut in a horizontal direction, and the pin is located in the U-shaped groove and is used to shift the shift head to rotate around the pivot;

[0009] The energy storage assembly includes a spring sleeved on the screw rod and two spring seats, the spring includes a first spring and a second spring respectively arranged at both ends of the nut and having the same structural dimensions, and the two spring seats are respectively located between the first spring and the nut and between the second spring and the nut;

[0010] There is a gap between the inner end surfaces of the two spring seats and the nut, one end of the first spring and the second spring respectively abuts against the outer end surface of the corresponding spring seat, and the other end abuts against the inner wall of the housing, and the inner end surfaces of the two spring seats respectively abut against the two side walls of the shift head; or the inner end surfaces of the two spring seats respectively abut against the end surfaces at both ends of the nut, one end of the first spring and the second spring respectively abut against the outer end surface of the spring seat, and the other end abuts against the inner wall of the housing;

[0011] The sensor assembly is electrically connected to the shift motor. The sensor assembly is used to detect the position of the shift knob and transmit the position information to the corresponding shift motor. The shift motor adjusts the position of the shift knob according to the position information.

[0012] Further, the sensor includes a displacement sensor disposed on the housing and a magnet assembly disposed on the corresponding nut. The displacement sensor is electrically connected to the corresponding shift motor. The displacement sensor determines the rotational position of the shift lever by measuring the relative position between itself and the magnet assembly, and transmits the position information of the shift lever to the corresponding shift motor. The shift motor adjusts the position of the shift lever according to the position information.

[0013] Further, the energy storage assembly further includes a support;

[0014] The support is located between the first spring and the housing and between the second spring and the housing, and the support is installed in the installation groove on the inner wall of the housing. The other ends of the first spring and the second spring are abutted against the inner wall of the housing through the support.

[0015] Further, the shift assembly further includes a bushing disposed between the pivot shaft and the shaft hole.

[0016] Further, a support shaft is coaxially disposed at one end of the lead screw away from the shift motor. The support shaft is located in the support groove provided on the inner wall of the housing. A wear-resistant sleeve is provided in the support groove, and the wear-resistant sleeve is sleeved on the support shaft.

[0017] Further, retaining rings are circumferentially disposed on the edges of the spring seat and the support.

[0018] Further, an arc contact surface is provided on the side wall of the shift lever that abuts against the inner end surface of the spring seat. The arc contact surface abuts against the inner end surface of the spring seat.

[0019] Compared with the prior art, the beneficial effects of the present utility model are:

[0020] (1) An energy-storable electric shift actuator provided by the utility model includes a housing and two identical electric shift execution units. Each electric shift execution unit includes a motion assembly, an energy storage assembly, a shift assembly, and a sensor assembly. The motion assembly is used to provide a shifting force, and the shift assembly is used to cooperate with the motion assembly to transfer the torque of the shift motor to the shift lever head for shifting operations. The sensor assembly is used to detect the position of the shift lever head and transmit the position information to the corresponding shift motor, and the shift motor adjusts the position of the shift lever head according to the position information. The energy storage assembly includes springs and spring seats respectively arranged at both ends of the nut. The spring seats are located between the first spring and the nut and between the second spring and the nut, and there is a gap between the spring seats and the nut. One end of the first spring and the second spring abuts against the spring seat, and the other end abuts against the inner wall of the housing; alternatively, the spring seat abuts against the end face of the nut, one end of the first spring and the second spring abuts against the spring seat, and the other end abuts against the inner wall of the housing; the two springs are pre-compressed and arranged at both ends of the nut to pre-load the nut and provide a neutral position positioning force, effectively avoiding overshoot. During shifting, when the shift motor rotates to drive the nut to move towards the first spring, at this time, the first spring compresses to store energy, and the second spring releases the pre-compressed energy, making the gear disengagement response faster, reducing the power interruption time, and at the same time avoiding the secondary impact during gear engagement. The overall structure is simple and convenient for processing.

[0021] (2) In the energy-storable electric shift actuator provided by the utility model, a first spring and a second spring are respectively arranged at both ends of the nut. During shifting, one side spring is compressed to store energy, and the other side spring releases the pre-compressed energy. The smoothness is better during the generation and release of the energy storage resistance, making the entire shifting process smoother and reducing jerks.

[0022] (3) The energy-storable electric shift actuator provided by the utility model is also provided with spring seats and supports. On the one hand, the spring seats and supports can prevent the wear of the nut and the inner wall of the housing. On the other hand, if the end face of the nut is too small to abut against the first spring and the second spring, the spring seats can be used to increase the abutting area.

[0023] (4) In the energy-storable electric shift actuator provided by the utility model, an arc abutting surface is provided on the side wall of the shift lever head that abuts against the inner end face of the spring seat, and the arc abutting surface abuts against the inner end face of the spring seat. In this way, when the shift lever head rotates, the arc abutting surface can continuously abut against the spring seat, and the arc transition is smooth without jerks. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a top view of an embodiment of the energy-storable electric shift actuator of the utility model;

[0025] Figure 2 isFigure 1 Y - Y view;

[0026] Figure 3 is Figure 1 Y1 - Y1 view.

[0027] The description of the reference numerals is as follows:

[0028] 1 - housing, 2 - moving component, 21 - shift motor, 22 - lead screw, 23 - nut; 3 - energy storage component,

[0029] 31 - first spring, 32 - second spring, 33 - spring seat, 34 - support; 4 - shift component, 41 - pivot,

[0030] 42 - shift lever, 421 - arc contact surface; 43 - bushing; 5 - sensor component, 51 - displacement sensor,

[0031] 52 - magnet component, 6 - wear-resistant sleeve, 7 - support shaft. Specific embodiments

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] Referring to Figures 1-3 , an energy - storage electric shift actuator of the present invention includes a housing 1 and two electric shift actuator units with the same structure. The electric shift actuator unit includes a moving component 2, an energy storage component 3, a shift component 4, and a sensor component 5.

[0034] Among them, the moving component 2 is used to provide the shifting force, including a shift motor 21, a lead screw 22, and a nut 23. The shift motor 21 is arranged at one end of the housing 1, and the output shaft of the shift motor 21 extends into the housing 1. The lead screw 22 is arranged corresponding to the output shaft, and one end of the lead screw 22 is connected to the output shaft of the shift motor 21. A support shaft 7 is coaxially arranged at the end far from the shift motor 21. A support groove is arranged on the inner wall of the housing 1, and the support shaft 7 is located in the support groove. In order to prevent the support shaft 7 from wearing the housing 1 when rotating, a wear - resistant sleeve 6 is arranged in the support groove, and the wear - resistant sleeve 6 is sleeved on the support shaft 7. In this way, both ends of the lead screw 22 are supported, and it rotates more stably. The nut 23 is screwed on the corresponding lead screw 22, and a pin is arranged on the outer wall of the nut 23 along the horizontal direction.

[0035] The shift assembly 4 includes a shift head 42 and a pivot 41 disposed in the housing 1. The shift head 42 is provided with a corresponding nut 23. The pivot 41 is located below the screw rod 22 and is fixedly connected to the housing 1. The axis of the pivot 41 is perpendicular to the axis of the screw rod 22. An axial hole is provided in the middle of the shift head 42, and the pivot 41 is located in the axial hole. In order to prevent the shift head 42 from rubbing against the pivot 41 when the shift head 42 rotates around the pivot 41 and causing rapid wear, the shift assembly 4 also includes a sleeve 43 disposed between the pivot 41 and the axial hole. The sleeve 43 is made of a softer metal such as brass, which can effectively reduce friction.

[0036] A U-shaped groove is formed on the upper portion of each shift head 42 , and a shift pin is located in the U-shaped groove. When the shift motor 21 drives the screw rod 22 to rotate, the nut 23 will move along the axial direction, thereby causing the shift pin to shift the shift head 42 to rotate around the pivot 41 .

[0037] The sensor assembly 5 includes a displacement sensor 51 disposed on the housing 1 and a magnet assembly 52 disposed on the corresponding nut 23. The displacement sensor 51 is electrically connected to the corresponding shift motor 21. The displacement sensor 51 determines the rotation position of the shift head 42 by measuring the relative position between the displacement sensor 51 and the magnet assembly 52, and at the same time transmits the detected position information of the shift head 42 to the corresponding shift motor 21. The shift motor 21 adjusts the position of the shift head 42 according to the position information. Because directly detecting the swing position of the shift head 42 requires the sensor to be directly disposed inside the housing 1, and the internal space of the housing 1 is small and has many moving parts, it is not easy to install the sensor, so this method is used to indirectly measure the position information of the shift head 42, and the structure is simple.

[0038] The energy storage component 3 includes a spring, a spring seat 33 and a support 34. The spring is sleeved on the lead screw 22 and includes a first spring 31 and a second spring 32 which are arranged at both ends of the nut 23 and have exactly the same structural dimensions. At the same time, the first spring 31 and the second spring 32 are pre-compressed and arranged at both ends of the nut 23. There are two spring seats 33 which are sleeved on the lead screw 22, and the two spring seats 33 are respectively located between the first spring 31 and the nut 23 and between the second spring 32 and the nut 23. The inner end faces of the two spring seats 33 respectively abut against the end faces at both ends of the nut 23. One end of the first spring 31 and the second spring 32 abuts against the end face of the nut 23 through the spring seat 33, and the other end abuts against the inner wall of the housing 1; or, there is a gap between the spring seat 33 and the nut 23. One end of the first spring 31 and the second spring 32 abuts against the spring seat 33, and the other end abuts against the inner wall of the housing 1. The inner end faces of the two spring seats 33 respectively abut against the two side walls of the shift lever 42. In order to ensure that there is no jerky due to large changes in its side structure when the shift lever 42 rotates, an arc abutting surface 421 is provided on the side wall of the shift lever 42 that abuts against the inner end face of the spring seat 33, and the arc abutting surface 421 abuts against the inner end face of the spring seat 33. These two forms can be flexibly selected according to the actual use situation. In this embodiment, the inner end faces of the two spring seats 33 respectively abut against the two side walls of the shift lever 42.

[0039] The support 34 is located between the first spring 31 and the housing 1 and between the second spring 32 and the housing 1, and the support 34 is installed in the installation groove on the inner wall of the housing 1. The other ends of the first spring 31 and the second spring 32 abut against the inner wall of the housing 1 through the support 34. In order to prevent the first spring 31 and the second spring 32 from slipping out of the spring seat 33 and the support 34 during the axial movement of the nut 23, retaining rings are arranged circumferentially at the edges of the spring seat 33 and the support 34.

[0040] In this embodiment, the free state length of the first spring 31 and the second spring 32 is x, and the stiffness is k. When they are pre-compressed and assembled at both ends of the nut 23, the length becomes x0. When the nut 23 moves from the neutral position to the side of the first spring 31 until the gear engagement is in place, its movement displacement is x1. Then the elastic potential energy stored in a single gear engagement process is equal to the elastic potential energy E released in a single gear disengagement process. Then there is:

[0041] E = 1 / 2 * k * [(x - x0 + x1) 2 - (x - x0 - x1) 2

[0042] After simplification, it can be obtained that

[0043] E = 2 * k * x1 * (x - x0)

[0044] To make the structure reliable, it is necessary to satisfy x - x0 > x1.

[0045] In order to make the electric shift actuator have a certain self-locking effect in gear, it is required that the force F of the disengagement force acting on the shift head 42 to move the nut 23 and drive the motor 21 to rotate and the screw 22 to rotate is greater than the maximum force applied by the energy storage component 3 to the nut 23, that is, F>k*(x-x0+x1)-k*(x-x0-x1), and after simplification, F>2*k*x1. That is, the reverse efficiency requirement of the screw 22 is relatively low, and the internal space of the housing 1 can be fully utilized.

[0046] When in use, the shift motor 21 drives the screw rod 22 to rotate, and transmits the torque of the shift motor 21 to the nut 23. If the nut 23 moves along the axis direction toward the first spring 31, when the nut 23 moves, the pin on it will move the shift head 42 to make it rotate around the pivot 41, and when the nut 23 moves, the first spring 31 compresses and stores energy, and the second spring 32 on the other side releases the pre-compressed energy. The first spring 31 and the second spring 32 preload the nut 23 and the neutral positioning force, which effectively avoids overshoot, makes the gear removal response speed faster, reduces the power interruption time, and avoids secondary impact when shifting. In addition, the energy storage component 3 is a double spring structure, which has better smoothness in the generation and release of energy storage resistance, making the entire shifting process smoother. In addition, after adding the energy storage component 3, it is not necessary to significantly change the original structure of the housing 1, the motion component 2, and the shift component 4, saving the cost of transformation and processing.

[0047] The embodiments described above are merely descriptions of the specific implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An electric shift actuator capable of energy storage, characterized in that: It comprises a housing (1) and two electric gear shift execution units with the same structure, wherein the electric gear shift execution units comprise a motion component (2), an energy storage component (3), a gear shift component (4) and a sensor component (5); The motion assembly (2) comprises a shift motor (21), a screw rod (22) and a nut (23); the shift motor (21) is arranged at one end of the housing (1), and the output shaft of the shift motor (21) extends into the housing (1); the screw rod (22) is connected to the output shaft of the shift motor (21), and the nut (23) is screwed onto the screw rod (22); The shift assembly (4) comprises a shift head (42) and a pivot (41) arranged in a housing (1); the pivot (41) is located below the screw rod (22) and is fixedly connected to the housing (1); the axis of the pivot (41) is perpendicular to the axis of the screw rod (22); the shift head (42) and the nut (23) are arranged correspondingly; an axial hole is arranged in the middle of the shift head (42), and the pivot (41) is located in the axial hole; a U-shaped groove is opened on the upper part of the shift head (42); a pin adapted to the U-shaped groove is arranged on the outer wall of the nut (23) in the horizontal direction; the pin is located in the U-shaped groove and is used to drive the shift head (42) to rotate around the pivot (41); The energy storage assembly (3) comprises a spring sleeved on the screw rod (22) and two spring seats (33), the spring comprising a first spring (31) and a second spring (32) respectively arranged at two ends of the nut (23) and having completely the same structural dimensions, the two spring seats (33) respectively being located between the first spring (31) and the nut (23) and between the second spring (32) and the nut (23); There is a gap between the inner end surfaces of the two spring seats (33) and the nut (23); one end of the first spring (31) and the second spring (32) respectively abuts against the outer end surface of the corresponding spring seat (33), and the other end respectively abuts against the inner wall of the housing (1); the inner end surfaces of the two spring seats (33) respectively abut against the two side walls of the shifting head (42); or the inner end surfaces of the two spring seats (33) respectively abut against the end surfaces at both ends of the nut (23); one end of the first spring (31) and the second spring (32) respectively abut against the outer end surface of the spring seat (33), and the other end abuts against the inner wall of the housing (1); The sensor assembly (5) is electrically connected to the shift motor (21), and the sensor assembly (5) is used to detect the position of the shift knob (42) and transmit the position information to the corresponding shift motor (21), and the shift motor (21) adjusts the position of the shift knob (42) according to the position information.

2. The energy-storable electric shift actuator according to claim 1, wherein: The sensor assembly (5) includes a displacement sensor (51) provided on the housing (1) and a magnet assembly (52) provided on the corresponding nut (23). The displacement sensor (51) is electrically connected to the corresponding shift motor (21). The displacement sensor (51) determines the rotational position of the shift lever (42) by measuring the relative position between it and the magnet assembly (52), and transmits the position information of the shift lever (42) to the corresponding shift motor (21). The shift motor (21) adjusts the position of the shift lever (42) according to the position information.

3. The energy-storable electric shift actuator according to claim 2, wherein: The energy storage assembly (3) further includes a support (34); The support (34) is located between the first spring (31) and the housing (1) and between the second spring (32) and the housing (1), and the support (34) is installed in the installation groove on the inner wall of the housing (1). The other ends of the first spring (31) and the second spring (32) are in contact with the inner wall of the housing (1) through the support (34).

4. The energy-storable electric shift actuator according to claim 3, characterized in that: The shift assembly (4) further includes a bushing (43) provided between the pivot (41) and the shaft hole.

5. The energy-storable electric shift actuator according to claim 4, characterized in that: One end of the lead screw (22) away from the shift motor (21) is coaxially provided with a support shaft (7). The support shaft (7) is located in the support groove provided on the inner wall of the housing (1). A wear-resistant sleeve (6) is provided in the support groove, and the wear-resistant sleeve (6) is sleeved on the support shaft (7).

6. The energy-storable electric shift actuator according to claim 5, characterized in that: Circular snap rings are circumferentially provided on the edges of the spring seat (33) and the support (34).

7. The energy-storable electric shift actuator according to claim 1, wherein: An arc contact surface (421) is provided on the side wall of the shift lever (42) in contact with the inner end surface of the spring seat (33). The arc contact surface (421) is in contact with the inner end surface of the spring seat (33).

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