Gear shifting executing mechanism

Abstract

The utility model provides a gear shifting executing mechanism. The gear shifting executing mechanism comprises an air cylinder shell; the end cover and the air cylinder shell jointly form a piston cavity; the piston push rod is located in the piston cavity, and the piston push rod comprises a first connecting end, a protruding part and a second connecting end which are sequentially arranged in the direction away from the end cover; the auxiliary piston is located in the piston cavity, the auxiliary piston is cylindrical, the first connecting end is sleeved with the auxiliary piston, and the auxiliary piston has a first movement state in contact with the end cover and a second movement state in contact with the protruding part; the electroplating hardening layer at least wraps the side face, making contact with the end cover, of the auxiliary piston and the side face, making contact with the protruding part, of the auxiliary piston, and the hardness of the electroplating hardening layer is larger than that of the end cover, the piston push rod and the auxiliary piston. According to the utility model, aluminum scraps generated when the auxiliary piston of the gear shifting actuating mechanism collides with the end cover and the piston push rod can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of automobile spare parts, and specifically, to a shift actuator. Background Art

[0002] A shift actuator is an important component in an automobile transmission system, and its main function is to realize the shift of the transmission gear according to the driver's intention or the instruction of the automatic transmission control system.

[0003] During the shift process of the shift actuator, the auxiliary piston will collide with the end cover and the piston push rod. However, in related designs, the auxiliary piston and the end cover are made of aluminum alloy materials. Therefore, a lot of aluminum chips will be generated during the collision process, and the aluminum chips will scratch the sealing ring and cause leakage, thereby resulting in low shift efficiency.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the utility model. Therefore, it may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0005] In view of this, the utility model provides a shift actuator to at least solve the problem that the auxiliary piston of the current shift actuator collides with the end cover and the piston push rod, thereby generating aluminum chips.

[0006] The utility model provides a shift actuator, including:

[0007] A cylinder housing;

[0008] An end cover, and the end cover and the cylinder housing together form a piston cavity;

[0009] A piston push rod, the piston push rod is located in the piston cavity, and the piston push rod includes a first connection end, a convex portion, and a second connection end arranged in sequence along the direction away from the end cover;

[0010] An auxiliary piston, the auxiliary piston is located in the piston cavity, the auxiliary piston is cylindrical, the auxiliary piston is sleeved outside the first connection end, and the auxiliary piston has a first motion state of contacting the end cover and a second motion state of contacting the convex portion;

[0011] A electroplated hardening layer, the electroplated hardening layer at least wraps the side surface of the auxiliary piston contacting the end cover and the side surface of the auxiliary piston contacting the convex portion, and the hardness of the electroplated hardening layer is greater than that of the end cover, the piston push rod, and the auxiliary piston.

[0012] In some embodiments, the electroplated hardening layer at least further wraps the side surface of the auxiliary piston close to the cylinder housing.

[0013] In some embodiments, the thickness of the electroplated hardening layer is 25 - 35 microns.

[0014] In some embodiments, the shift actuator further includes:

[0015] A main housing sleeved on the second connection end, the main housing having a third motion state in contact with the protruding portion;

[0016] Three buffer rings, the buffer rings being located at least on the side of the auxiliary piston in contact with the end cover, the side of the auxiliary piston in contact with the protruding portion, and the surface of the main housing in contact with the protruding portion.

[0017] In some embodiments, the auxiliary piston has annular first inclined grooves at the inner walls near the end cover and the protruding portion respectively;

[0018] The main housing has an annular second inclined groove at the inner wall near the protruding portion;

[0019] The buffer ring includes an annular buffer surface and an annular clamping portion. The buffer ring is clamped to the auxiliary piston and the main housing through the first inclined groove, the second inclined groove and the clamping portion respectively, and the buffer surface wraps the side of the auxiliary piston in contact with the end cover, the side of the auxiliary piston in contact with the protruding portion, and the surface of the main housing in contact with the protruding portion.

[0020] In some embodiments, the buffer surface wrapping the side of the auxiliary piston also wraps outside the electroplated hardening layer.

[0021] In some embodiments, the auxiliary piston has annular first dovetail grooves at the sides near the end cover and the protruding portion;

[0022] The main housing has an annular second dovetail groove at the surface near the protruding portion;

[0023] The buffer ring is annular, the buffer ring is clamped in the dovetail groove and at least partially exposed outside the dovetail groove.

[0024] In some embodiments, the first dovetail groove penetrates through the electroplated hardening layer.

[0025] In some embodiments, the shift actuator further includes:

[0026] A main housing sleeved on the second connection end of the piston push rod, the main housing having a fourth motion state in contact with the protruding portion;

[0027] At least two buffer pads, at least one buffer pad being installed on the surface of the end cover near the auxiliary piston, and at least one buffer pad being installed on the surface of the main housing near the protruding portion.

[0028] In some embodiments, the buffer pad includes a pad surface and an inverted buckle;

[0029] The end cover has a first card slot on the surface near the auxiliary piston, and the main housing has a second card slot on the surface near the protruding portion;

[0030] The buffer pad is installed on the end cover and the main housing through the first clamping groove and the second clamping groove respectively;

[0031] The pad surface at least partially covers the surface of the end cover close to the auxiliary piston and the surface of the main housing close to the convex part.

[0032] In the shift actuator of the present utility model, by providing a electroplated hardening layer, the electroplated hardening layer at least wraps the side surfaces of the auxiliary piston contacting the end cover and the side surfaces of the auxiliary piston contacting the convex part, and the hardness of the electroplated hardening layer is greater than that of the end cover, the piston push rod and the auxiliary piston, which can reduce the aluminum chips generated when the aluminum auxiliary piston impacts the aluminum end cover and the piston push rod, thereby reducing the probability of the aluminum chips scratching the sealing ring and causing leakage, and further resulting in low shift efficiency.

[0033] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present utility model. Description of the Drawings

[0034] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present utility model, and are used together with the specification to explain the principles of the present utility model. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0035] Figure 1 is a schematic diagram of a working state of a shift actuator in the related art;

[0036] Figure 2 is Figure 1 a schematic diagram of another working state of the shift actuator in;

[0037] Figure 3 is a schematic diagram of the structure of a shift actuator provided by an embodiment of the present application;

[0038] Figure 4 is a schematic diagram of the structure of an auxiliary piston and an electroplated hardening layer provided by an embodiment of the present application;

[0039] Figure 5 is a schematic diagram of the structure of another shift actuator provided by an embodiment of the present application;

[0040] Figure 6 is Figure 5 a partial enlarged view of the buffer ring at the auxiliary piston in;

[0041] Figure 7 is Figure 5 a partial enlarged view of the buffer ring at the main housing in;

[0042] Figure 8 yes Figure 5 A structural schematic diagram of the middle buffer ring;

[0043] Figure 9 yes Figure 5 Another structural schematic diagram of the middle buffer ring;

[0044] Figure 10 is a structural schematic diagram of another shift actuator provided in an embodiment of the present application;

[0045] Figure 11 yes Figure 10 A partial enlarged view of the buffer ring at the middle auxiliary piston;

[0046] Figure 12 yes Figure 10 A partial enlarged view of the buffer ring at the middle main shell;

[0047] Figure 13 yes Figure 10 A structural schematic diagram of the middle buffer ring;

[0048] Figure 14 is a structural schematic diagram of another shift actuator provided in an embodiment of the present application;

[0049] Figure 15 yes Figure 14 A schematic diagram of the structure of the middle end cover and the buffer pad;

[0050] Figure 16 yes Figure 14 Another schematic diagram of the structure of the middle end cover and the buffer pad;

[0051] Figure 17 yes Figure 16 A partial enlarged view of the middle cushion;

[0052] Figure 18 yes Figure 16 A structural schematic diagram of a buffer pad.

[0053] Reference numerals:

[0054] 10. Cylinder housing; 20. End cover; 21. First slot; 30. Piston push rod; 31. First connecting end; 32. Raised portion; 33. Second connecting end; 40. Auxiliary piston; 41. First inclined groove; 42. First dovetail groove; 50. Electroplating hardening layer; 60. Main housing; 61. Second inclined groove; 62. Second dovetail groove; 70. Buffer ring; 71. Buffer surface; 72. Snap-fit portion; 80. Buffer pad; 81. Pad surface; 82. Undercut. DETAILED DESCRIPTION

[0055] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this utility model will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their repetitive description will be omitted.

[0056] The terms "first", "second" and similar terms used in the detailed description do not denote any order, quantity or importance, but are only used to distinguish different components. In addition, in the description of this utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of this utility model.

[0057] It should be noted that, without conflict, the features in the embodiments of this utility model and in different embodiments can be combined with each other.

[0058] As Figure 1 and Figure 2 shown, in the related art, the shift actuator includes a cylinder housing 10, an end cap 20, a piston push rod 30, and an auxiliary piston 40. Among them, the auxiliary piston 40 includes a first connection end 31, a convex portion 32, and a second connection end 33. In the related design, the auxiliary piston 40 and the end cap 20 are made of aluminum alloy. During the shift selection process of the shift actuator, the auxiliary piston 40 will collide with the end cap 20 and the piston push rod 30. Therefore, a lot of aluminum chips will be generated during the collision, and the aluminum chips will scratch the sealing ring and cause leakage, thereby resulting in low shift efficiency.

[0059] Through careful and in - depth research, the inventors of this case have provided a solution to the problems existing in the prior art. The present utility model provides a shift execution mechanism, comprising: a cylinder housing; an end cap, the end cap and the cylinder housing jointly forming a piston cavity; a piston push rod, the piston push rod being located within the piston cavity, the piston push rod including a first connection end, a convex portion, and a second connection end arranged in sequence along the direction away from the end cap; an auxiliary piston, the auxiliary piston being located within the piston cavity, the auxiliary piston being cylindrical, the auxiliary piston being sleeved outside the first connection end, the auxiliary piston having a first motion state in contact with the end cap and a second motion state in contact with the convex portion; an electroplated hardening layer, the electroplated hardening layer at least covering the side surface of the auxiliary piston in contact with the end cap and the side surface of the auxiliary piston in contact with the convex portion, the hardness of the electroplated hardening layer being greater than that of the end cap, the piston push rod, and the auxiliary piston. In the shift execution mechanism of the present utility model, by providing the electroplated hardening layer, the electroplated hardening layer at least covers the side surface of the auxiliary piston in contact with the end cap and the side surface of the auxiliary piston in contact with the convex portion, and the hardness of the electroplated hardening layer is greater than that of the end cap, the piston push rod, and the auxiliary piston, it is possible to reduce the aluminum chips generated when the aluminum - made auxiliary piston impacts the aluminum - made end cap and piston push rod, thereby reducing the probability that the aluminum chips scratch the sealing ring and cause leakage, and further resulting in low shift efficiency.

[0060] As Figure 3 and Figure 4 shown, the present utility model provides a shift execution mechanism, comprising: a cylinder housing 10, an end cap 20, a piston push rod 30, and an auxiliary piston 40.

[0061] Specifically, the end cap 20 and the cylinder housing 10 jointly form a piston cavity, and both the piston push rod 30 and the auxiliary piston 40 are located within the piston cavity. Moreover, the end cap 20 and the cylinder housing 10 can be made of aluminum.

[0062] Specifically, the piston push rod 30 includes a first connection end 31, a convex portion 32, and a second connection end 33 arranged in sequence along the direction away from the end cap 20. The first connection end 31 of the piston push rod 30 is connected to the armature shaft, driving the armature shaft to move back and forth along the axis direction of the end cap 20. The material of the piston push rod 30 can be iron.

[0063] Specifically, the auxiliary piston 40 is cylindrical, the auxiliary piston 40 is sleeved outside the first connection end 31, and the auxiliary piston 40 has a first motion state in contact with the end cap 20 and a second motion state in contact with the convex portion 32. The auxiliary piston 40 can be made of aluminum. When both the auxiliary piston 40 and the end cap 20 are made of aluminum, aluminum chips are likely to be generated when the auxiliary piston 40 impacts the end cap 20 and the piston push rod 30.

[0064] Specifically, the electroplated hardening layer 50 at least wraps the side surfaces of the auxiliary piston 40 in contact with the end cover 20 and the side surfaces of the auxiliary piston 40 in contact with the protruding portion 32. The hardness of the electroplated hardening layer 50 is greater than that of the end cover 20, the piston push rod 30, and the auxiliary piston 40. The setting of the hardness and position of the electroplated hardening layer 50 can reduce the aluminum chips generated when the aluminum auxiliary piston 40 impacts the aluminum end cover 20 and the piston push rod 30, thereby reducing the probability that the aluminum chips scratch the sealing ring and cause leakage, and further resulting in low shift efficiency.

[0065] Further, the electroplated hardening layer 50 can be obtained by electroplating an anodic oxidation film on the side surfaces of the auxiliary piston 40 in contact with the end cover 20 and the side surfaces of the auxiliary piston 40 in contact with the protruding portion 32. This anodic oxidation film, that is, the electroplated hardening layer 50, is hard in texture and can also improve the hardness, wear resistance, and corrosion resistance of the surface of the auxiliary piston 40.

[0066] Continue to refer to Figure 3 , in some embodiments, the electroplated hardening layer 50 at least further wraps the side surface of the auxiliary piston 40 close to the cylinder housing 10. Since the cylinder housing 10 can also be made of aluminum, and when the shift actuator selects and shifts gears, the auxiliary piston 40 will also collide with the cylinder housing 10, thereby generating aluminum chips. The above setting of the electroplated hardening layer 50 can reduce the aluminum chips generated when the auxiliary piston 40 collides with the cylinder housing 10.

[0067] Further, the electroplated hardening layer 50 of this embodiment can be obtained by electroplating an anodic oxidation film on the entire surface of the auxiliary piston 40 to further improve the hardness, wear resistance, and corrosion resistance of the surface of the auxiliary piston 40.

[0068] In some embodiments, the thickness of the electroplated hardening layer 50 is 25 to 35 microns. The above thickness setting of the electroplated hardening layer 50 can effectively reduce the aluminum chips generated when the auxiliary piston 40 collides with the end cover 20, the piston push rod 30, and the cylinder housing 10.

[0069] As Figure 5 shown, in some embodiments, the shift actuator further includes: a main housing 60 and three buffer rings 70.

[0070] Specifically, the main housing 60 is sleeved on the second connection end 33, and the main housing 60 has a third motion state of the protruding portion 32 in contact. The main housing 60 can also be an aluminum structure.

[0071] Specifically, the buffer ring 70 is at least located on the side of the auxiliary piston 40 in contact with the end cover 20, the side of the auxiliary piston 40 in contact with the convex portion 32, and the surface of the main housing 60 in contact with the convex portion 32. When the main housing 60, the auxiliary piston 40, and the end cover 20 are all made of aluminum, aluminum chips are likely to be generated when the convex portion 32 impacts the main housing 60. The above-mentioned position setting of the buffer ring 70 can effectively reduce the aluminum chips generated when the auxiliary piston 40 collides with the end cover 20, the piston push rod 30, and the main housing 60.

[0072] As Figure 6 , Figure 7 , Figure 8 and Figure 9 shown, in some alternative embodiments, the auxiliary piston 40 has annular first inclined grooves 41 at the inner walls near the end cover 20 and the convex portion 32 respectively. The main housing 60 has an annular second inclined groove 61 at the inner wall near the convex portion 32. The buffer ring 70 includes an annular buffer surface 71 and an annular clamping portion 72. The buffer ring 70 is clamped to the auxiliary piston 40 and the main housing 60 through the first inclined groove 41, the second inclined groove 61, and the clamping portion 72 respectively. The buffer surface 71 wraps the side of the auxiliary piston 40 in contact with the end cover 20, the side of the auxiliary piston 40 in contact with the convex portion 32, and the surface of the main housing 60 in contact with the convex portion 32.

[0073] Specifically, the opening of the first inclined groove 41 and the second inclined groove 61 facilitates the installation of the buffer ring 70 on the auxiliary piston 40 and the main housing 60, and at the same time facilitates the replacement of the buffer ring 70. At the same time, the buffer ring 70 can be made of elastic plastic or rubber material, providing buffering and shock absorption when the auxiliary piston 40 collides with the end cover 20, the piston push rod 30, and the main housing 60, avoiding direct collision of the aluminum structures, so as to reduce the aluminum chips generated during the collision.

[0074] Further, two buffer rings 70 are respectively sleeved outside the first connection end 31 and the second connection end 33 of the piston push rod 30, which can provide a guiding function for the piston push rod 30, so that the piston push rod 30 moves along the direction restricted by the two buffer rings 70. There is a gap between the buffer ring 70 and the first connection end 31 and the second connection end 33, and the width of this gap is between 0.03 and 0.17 millimeters. The above-mentioned gap width can provide a guiding function while avoiding friction and affecting the movement of the piston push rod 30.

[0075] In some embodiments, the buffer surface 71 wrapping the side of the auxiliary piston 40 also wraps outside the electroplated hardening layer 50. That is to say, the buffer ring 70 and the protective layer in this embodiment can be set at the same time to further avoid direct collision of the aluminum structures, so as to reduce the aluminum chips generated during the collision.

[0076] As Figure 10 , Figure 11 , Figure 12 andFigure 13 As shown, in some alternative embodiments, the auxiliary piston 40 has an annular first dovetail groove 42 on the side close to the end cap 20 and the convex portion 32. The surface of the main housing 60 close to the convex portion 32 has an annular second dovetail groove 62. The buffer ring 70 is annular, and the buffer ring 70 is snap-fitted into the dovetail groove and at least partially exposed outside the dovetail groove.

[0077] Specifically, the opening of the first dovetail groove 42 and the second dovetail groove 62 facilitates the installation of the buffer ring 70 on the auxiliary piston 40 and the main housing 60, and at the same time facilitates the replacement of the buffer ring 70. At the same time, the buffer ring 70 can be made of elastic plastic or rubber material, providing buffer and shock absorption when the auxiliary piston 40 collides with the end cap 20, the piston push rod 30 and the main housing 60, avoiding direct collision of the aluminum structure, so as to reduce the aluminum chips generated during the collision.

[0078] In some embodiments, the first dovetail groove 42 penetrates through the electroplated hardening layer 50. That is to say, the buffer ring 70 and the protective layer in this embodiment can be set at the same time to further avoid direct collision of the aluminum structure, so as to reduce the aluminum chips generated during the collision.

[0079] As Figure 14 、 Figure 15 、 Figure 16 and Figure 17 As shown, in some embodiments, the shift actuator further includes: a main housing 60 and at least two buffer pads 80.

[0080] Specifically, the main housing 60 is sleeved on the second connection end 33 of the piston push rod 30, and the main housing 60 has a fourth motion state in contact with the convex portion 32. The main housing 60 can also be made of an aluminum structure.

[0081] Specifically, at least one buffer pad 80 is installed on the surface of the end cap 20 close to the auxiliary piston 40, and at least one buffer pad 80 is installed on the surface of the main housing 60 close to the convex portion 32. When the main housing 60, the auxiliary piston 40 and the end cap 20 are all made of aluminum, the above position setting of the buffer pad 80 can effectively reduce the aluminum chips generated when the auxiliary piston 40 collides with the end cap 20, the piston push rod 30 and the main housing 60.

[0082] Furthermore, the buffer ring 70 can be made of elastic plastic or rubber material, providing buffer and shock absorption when the auxiliary piston 40 collides with the end cap 20, the piston push rod 30 and the main housing 60, avoiding direct collision of the aluminum structure, so as to reduce the aluminum chips generated during the collision.

[0083] As Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 and Figure 18As shown, in some embodiments, the buffer pad 80 includes a pad surface 81 and an undercut 82. The surface of the end cap 20 close to the auxiliary piston 40 has a first card slot 21, and the surface of the main housing 60 close to the protruding portion 32 has a second card slot. The buffer pad 80 is installed on the end cap 20 and the main housing 60 through the first card slot 21 and the second card slot respectively. The pad surface 81 at least partially covers the surface of the end cap 20 close to the auxiliary piston 40 and the surface of the main housing 60 close to the protruding portion 32.

[0084] Specifically, the number of the undercuts 82 can be multiple, and the shapes of the first card slot 21 and the second card slot match the undercuts 82, so as to enhance the installation strength between the buffer pad 80 and the end cap 20 and the main housing 60. The pad surface 81 of the buffer pad 80 can be made of elastic plastic or rubber material, so as to provide buffering and shock absorption when the auxiliary piston 40 collides with the end cap 20, the piston push rod 30 and the main housing 60, avoid direct collision of the aluminum structure, and reduce the aluminum chips generated during the collision. The number of the buffer pads 80 can be increased or decreased according to the situation, and the present application does not limit this.

[0085] In summary, for the shift actuator of the present utility model, by providing a electroplated hardening layer, the electroplated hardening layer at least wraps the side surfaces of the auxiliary piston contacting the end cap and the side surfaces of the auxiliary piston contacting the protruding portion, and the hardness of the electroplated hardening layer is greater than that of the end cap, the piston push rod and the auxiliary piston, which can reduce the aluminum chips generated when the aluminum auxiliary piston collides with the aluminum end cap and the piston push rod, thereby reducing the probability that the aluminum chips scratch the sealing ring and cause leakage, and further resulting in low shift efficiency.

[0086] The above content is a further detailed description of the present utility model in combination with specific optional embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present utility model.

Claims

1. A shift execution mechanism, characterized in that, Comprising: Cylinder housing; End cover, the end cover and the cylinder housing jointly form a piston cavity; Piston push rod, the piston push rod is located in the piston cavity, the piston push rod includes a first connection end, a convex portion and a second connection end arranged in sequence along the direction away from the end cover; Auxiliary piston, the auxiliary piston is located in the piston cavity, the auxiliary piston is cylindrical, the auxiliary piston is sleeved outside the first connection end, and the auxiliary piston has a first motion state contacting the end cover and a second motion state contacting the convex portion; Electroplated hardening layer, the electroplated hardening layer at least wraps the side surface of the auxiliary piston contacting the end cover and the side surface of the auxiliary piston contacting the convex portion, and the hardness of the electroplated hardening layer is greater than that of the end cover, the piston push rod and the auxiliary piston.

2. The shift actuator according to claim 1, wherein The electroplated hardening layer at least further wraps the side surface of the auxiliary piston close to the cylinder housing.

3. The shift execution mechanism according to claim 1, characterized in that, The thickness of the electroplated hardening layer is 25 - 35 microns.

4. The shift execution mechanism according to claim 1, characterized in that, The shift actuator further comprises: Main housing, the main housing is sleeved on the second connection end, and the main housing has a third motion state contacting the convex portion; Three buffer rings, the buffer rings are at least located on the side surface of the auxiliary piston contacting the end cover, the side surface of the auxiliary piston contacting the convex portion, and the surface of the main housing contacting the convex portion.

5. The shift execution mechanism according to claim 4, characterized in that, The inner walls of the auxiliary piston close to the end cover and the convex portion respectively have annular first inclined grooves; The inner wall of the main housing close to the convex portion has an annular second inclined groove; The buffer ring includes an annular buffer surface and an annular clamping portion, and the buffer ring is respectively clamped with the auxiliary piston and the main housing through the first inclined groove, the second inclined groove and the clamping portion, and the buffer surface wraps the side surface of the auxiliary piston contacting the end cover, the side surface of the auxiliary piston contacting the convex portion, and the surface of the main housing contacting the convex portion.

6. The shift actuator according to claim 5, characterized in that, The buffer surface wrapping the side surface of the auxiliary piston also wraps outside the electroplated hardening layer.

7. The shift execution mechanism according to claim 4, characterized in that The side surfaces of the auxiliary piston close to the end cover and the convex portion have annular first dovetail grooves; The surface of the main housing close to the convex portion has an annular second dovetail groove; The buffer ring is annular, the buffer ring is clamped in the dovetail groove and at least partially exposed outside the dovetail groove.

8. The shift execution mechanism according to claim 7, characterized in that, The first dovetail groove penetrates through the electroplated hardening layer.

9. The shift execution mechanism according to claim 1, characterized in that, The shift actuator further comprises: Main housing, the main housing is sleeved on the second connection end of the piston push rod, and the main housing has a fourth motion state contacting the convex portion; At least two buffer pads, at least one buffer pad is installed on the surface of the end cover close to the auxiliary piston, and at least one buffer pad is installed on the surface of the main housing close to the convex portion.

10. The shift actuator according to claim 9, characterized in that, The buffer pad includes a pad surface and an inverted buckle; The surface of the end cover close to the auxiliary piston has a first card slot, and the surface of the main housing close to the convex portion has a second card slot; The buffer pad is respectively installed on the end cover and the main housing through the first card slot and the second card slot; The cushion surface at least partially covers the surface of the end cap close to the auxiliary piston and the surface of the main housing close to the convex portion.

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