Snap spring anti-disengagement device

Abstract

The invention relates to a snap spring anti-disengagement device and an automobile motor shaft assembly, and the snap spring anti-disengagement device comprises a snap spring which comprises a first gap; the radial outer side of the clamping spring is sleeved with the anti-disengaging sleeve, and the anti-disengaging sleeve axially covers the first notch of the clamping spring and is used for limiting radial movement of the clamping spring. The anti-disengaging sleeve of the snap spring anti-disengaging device can limit the opening of the first notch of the snap spring under the centrifugal force effect of high-speed rotation of the motor shaft, the snap spring is prevented from disengaging and losing efficacy, and the reliability is high. When the snap spring anti-disengaging device works, the snap spring can resist the centrifugal force generated by the running speed, and the rotating speed of a motor shaft applying the snap spring can be higher.

Description

Technical Field

[0001] The invention relates to the technical field of motor shaft parts, and in particular to a retaining spring anti-disengagement device for high-speed rotation. Background Art

[0002] The retaining spring is a C-shaped retaining spring with a notch. It can play the role of axial limit in various working conditions. When the retaining spring is connected to the retaining spring groove of the automobile motor shaft, it rotates at high speed with the automobile motor shaft. Under the action of centrifugal force, the retaining spring is easy to open along the notch and has a tendency to radially detach from the motor shaft, causing the axial limit function of the retaining spring to fail. With the continuous development of electric vehicles, the speed of the motor shaft in electric vehicles is also increasing. Therefore, higher requirements are put forward to prevent the retaining spring from detaching from the motor shaft.

[0003] In the related art, the solution to prevent the retaining spring from coming out is a double-layer structure with an interlocking structure. The two-layer retaining spring structure has an interlocking structure with a reverse hook, which can prevent the retaining spring from coming out. However, the double-layer structure causes a large axial dimension tolerance. The interlocking structure also has a certain axial thickness. When locking, it needs to be flattened to embed the retaining spring into the retaining spring groove of the motor shaft, so the installation of special retaining springs of this type of structure is also inconvenient. In addition, the reliability of special retaining springs of this type of structure is also low under high speed and high centrifugal force conditions. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present invention provides a retaining spring anti-disengagement device and an automobile motor shaft assembly.

[0005] According to a first aspect of an embodiment of the present disclosure, the present disclosure provides a device for preventing a retaining spring from disengaging, comprising: a retaining spring comprising a first notch; and an anti-disengagement sleeve, wherein the anti-disengagement sleeve is sleeved on the radially outer side of the retaining spring and axially covers the first notch of the retaining spring to limit the radial movement of the retaining spring.

[0006] In some embodiments, the anti-drop sleeve includes: an axial portion, which is sleeved on the radial outside of the retaining spring and radially spaced from the outer wall of the retaining spring; and a radial portion, which is located at the axial end of the axial portion away from the retaining spring and is folded toward the radial outside or radial inside of the axial portion.

[0007] In some embodiments, the anti-drop sleeve includes: a second notch; and a weight-increasing protrusion, wherein the weight-increasing protrusion is arranged at 180° with the second notch, and the weight-increasing protrusion is located in the first notch of the retaining spring.

[0008] In some embodiments, the anti-drop sleeve is formed by stamping a plurality of convex-shaped blanks from a stainless steel strip, and the convex-shaped blank includes a circumferential portion and a raised portion. The circumferential portion is bent circumferentially to form the anti-drop sleeve having the second notch, and the raised portion is further bent radially inward to form the weight-increasing protrusion.

[0009] In some embodiments, the radial portion is provided with a weight-reducing hole, and the weight-reducing hole is arranged at 180° with the first notch of the retaining ring.

[0010] According to a second aspect of an embodiment of the present disclosure, the present disclosure provides an automobile motor shaft assembly, comprising: a motor shaft, an annular retaining ring groove is provided on the outer wall of the motor shaft; a gear, the gear is torque-resistantly sleeved on the outside of the motor shaft, a stepped hole is provided at one axial end of the gear, the stepped hole forms an inner end face and an outer end face of the gear, the retaining ring groove is axially located between the inner end face and the outer end face, and one end of the retaining ring groove is aligned with the inner end face; as the retaining ring anti-detachment device as described in the first aspect, the retaining ring is clamped in the retaining ring groove and abuts against the inner end face of the gear, and the anti-detachment sleeve is axially fixed to the gear.

[0011] In some embodiments, the retaining spring anti-disengagement device includes: an axial portion, which is sleeved on the radial outside of the retaining spring and radially spaced from the outer wall of the retaining spring; and a radial portion, which is located at the axial end of the axial portion away from the retaining spring, and the radial portion is folded toward the radial outside or radial inside of the axial portion, and the radial portion is axially spaced from the outer end surface of the gear.

[0012] In some embodiments, the radial portion is folded radially inwardly of the axial portion, and a radial end surface of the radial portion is spaced apart from an outer wall of the motor shaft.

[0013] In some embodiments, a hook is provided at the other axial end of the axial portion close to the retaining spring, and a groove is provided on the inner wall of the stepped hole of the gear, and the hook is inserted into the groove to limit the axial movement of the anti-drop sleeve.

[0014] In some embodiments, the axial portion is interference fit with the stepped hole of the gear.

[0015] The technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: the anti-disengagement device of the circlip can limit the first notch of the circlip from opening under the centrifugal force of the high-speed rotation of the motor shaft, thereby preventing the circlip from loosening and failing, and having high reliability. When the anti-disengagement device of the circlip disclosed in the present disclosure is working, the circlip can resist the centrifugal force generated by the running speed, so that the rotation speed of the motor shaft to which the circlip is applied can be higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of an automobile motor shaft assembly shown in a first exemplary embodiment;

[0018] Figure 2 is a perspective exploded schematic diagram of an automobile motor shaft assembly shown in a first exemplary embodiment;

[0019] Figure 3 is a cross-sectional view of an automotive motor shaft assembly shown in a first exemplary embodiment;

[0020] Figure 4 is a perspective exploded schematic diagram of an automobile motor shaft assembly shown in a second exemplary embodiment;

[0021] Figure 5 is a cross-sectional view of an automotive motor shaft assembly shown in a second exemplary embodiment;

[0022] Figure 6 is a perspective exploded schematic diagram of an automobile motor shaft assembly shown in a third exemplary embodiment;

[0023] Figure 7 is a cross-sectional view of an automotive motor shaft assembly shown in a third exemplary embodiment;

[0024] Figure 8 is a schematic diagram of the three-dimensional structure of an automobile motor shaft assembly shown in a third exemplary embodiment;

[0025] Fig. 9 yes Figure 7 A schematic diagram of the structure of the middle A part;

[0026] Fig.10 It is a schematic diagram of the structure of a stainless steel strip, which includes a plurality of convex-shaped blanks;

[0027] Fig.11 The anti-drop sleeve is formed by bending the convex-shaped blank shown in Figure 10. DETAILED DESCRIPTION

[0028] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0029] In the present invention, unless otherwise specified, the axial direction A, radial direction R and circumferential direction W refer to the axial direction A, radial direction R and circumferential direction W of the retaining spring anti-disengagement device respectively; the axial end refers to Figure 3 , Figure 5 and Figure 7 The left side of the axis A refers to the other end of Figure 3 , Figure 5 and Figure 7 The right side of the radial R outside refers to the radial R away from Figure 3 , Figure 5 and Figure 7 The radial direction R inner side refers to the side close to the center axis O in the radial direction R.

[0030] The term "torsionally resistant connection" refers to a connection between two components in a manner that they do not rotate relative to each other, which can be achieved through a press fit (i.e., an interference fit) or by forming the two components mentioned in one piece. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0031] In order to solve the above technical problems, the present disclosure provides a retaining spring anti-detachment device 30, which is applied to an automobile motor shaft assembly 100. Specifically, Figures 1 to 7 As shown, the automobile motor shaft assembly 100 includes a motor shaft 10 , a gear 20 , and a retaining spring anti-disengagement device 30 .

[0032] The gear 20 is sleeved on the outside of the motor shaft 10 and connected to the motor shaft 10 in a torsion-proof manner, wherein the outer wall of the motor shaft 10 is provided with an external spline, and the inner wall 24 of the gear 20 is provided with an internal spline. When the gear 20 is sleeved on the outside of the motor shaft 10, the cooperation between the internal spline and the external spline realizes the torsion-proof connection between the gear 20 and the motor shaft 10 in the circumferential direction W, thereby transmitting torque or power. However, the gear 20 and the motor shaft 10 have a tendency to move axially in the axial direction A, and the retaining spring 31 is used to limit the axial movement of the gear 20.

[0033] Specifically, Figure 3 As shown, the retaining spring anti-disengagement device 30 includes a retaining spring 31 and an anti-disengagement sleeve 32. The retaining spring 31 is applied to the motor shaft 10 that rotates at a high speed. The outer wall of the motor shaft 10 is provided with an annular retaining spring groove 11 at the external spline. The retaining spring 31 is inserted into the retaining spring groove 11 and protrudes radially R from the outer wall of the motor shaft 10, so that the end face of the retaining spring 31 can abut against the end face of the gear 20, thereby limiting the axial movement of the gear 20 relative to the motor shaft 10 and playing the role of axial limiting.

[0034] The retaining spring 31 is usually a C-shaped structure with a first notch 311. However, due to the high-speed rotation of the motor shaft 10, the retaining spring 31 tends to move in the radial direction R under the action of inertia, making it easy for the first notch 311 to open and disengage from the motor shaft 10, causing the retaining spring 31 to lose its axial limiting function. The anti-disengagement sleeve 32 is used to prevent the retaining spring 31 from being disengaged from the motor shaft 10 in the radial direction R.

[0035] Specifically, the anti-dropout sleeve 32 is sleeved on the radially outer side of the clip spring 31, and covers the first notch 311 of the clip spring 31 in the axial direction A, so as to limit the radial movement of the clip spring 31. It can be seen that under the action of the inertial force generated by the high-speed rotation of the motor shaft 10, the first notch 311 of the clip spring 31 has a tendency to open, and the anti-dropout sleeve 32 sleeved on the radially outer side of the clip spring 31 cannot continue to move radially after the clip spring 31 moves radially and abuts against the inner wall of the anti-dropout sleeve 32, so that the first notch 311 of the clip spring 31 cannot continue to open, thereby preventing the clip spring 31 from detaching from the motor shaft 10.

[0036] Compared with the double-layered retaining spring with an interlocking structure in the related art, the anti-detachment sleeve 32 in the retaining spring anti-detachment device 30 disclosed in the present invention can reduce the axial thickness of the double-layered retaining spring in the related art, and reduce the complex structure, manufacturing process difficulty and installation difficulty of the double-layered retaining spring. The anti-detachment sleeve 32 disclosed in the present invention can limit the first notch 311 of the retaining spring 31 from opening under the centrifugal force of the high-speed rotation of the motor shaft 10, and prevent the retaining spring 31 from loosening and failing. It is not only simple in structure, but also highly reliable. When the retaining spring anti-detachment device 30 disclosed in the present invention is working, the retaining spring 31 can resist the centrifugal force generated by the operating speed, so that the rotation speed of the motor shaft 10 to which the retaining spring 31 is applied can be higher, and the scope of application is wide.

[0037] Furthermore, if Figure 3 , Figure 5 and Figure 7 As shown, a stepped hole 21 is provided at one axial end of the gear 20, and the stepped hole 21 forms an inner end face 22 and an outer end face 23 on the gear 20. The retaining spring groove 11 is located between the inner end face 22 and the outer end face 23 along the axial direction A, and one end of the retaining spring groove 11 is radially aligned with the inner end face 22; the retaining spring 31 of the retaining spring anti-disengagement device 30 is clamped in the retaining spring groove 11 and abuts against the inner end face 22 of the gear 20.

[0038] The anti-dropout sleeve 32 is located between the outer wall of the retaining spring 31 and the inner wall 24 of the gear 20 along the radial direction R, so as to prevent the retaining spring 31 from contacting the inner wall 24 of the gear 20 when moving under the action of inertia, thereby protecting the gear 20. In addition, the anti-dropout sleeve 32 can be relatively fixed with the gear 20 in the axial direction A, that is, the anti-dropout sleeve 32 and the gear 20 do not move relative to each other in the axial direction A, and the anti-dropout sleeve 32 can move with the axial movement of the gear 20, thereby preventing the retaining spring 31 from axially dropping out of the gear 20 and losing the function of preventing the retaining spring 31 from dropping out.

[0039] In some embodiments, the anti-drop sleeve 32 includes an axial portion 321 and a radial portion 322 .

[0040] The axial portion 321 is sleeved on the radial outer side of the retaining spring 31 and is radially spaced from the outer wall of the retaining spring 31. The inner wall of the axial portion 321 is radially spaced from the outer wall of the retaining spring 31. When the rotation speed of the motor shaft 10 is less than a certain rotation speed, the first notch 311 of the retaining spring 31 can allow the retaining spring 31 to move radially a certain distance and cannot be detached from the motor shaft 10. When the rotation speed of the motor shaft 10 is greater than a certain rotation speed, the retaining spring 31 moves radially and abuts against the axial portion 321 of the anti-slip sleeve 32. Therefore, the axial portion 321 and retaining spring 31 are spaced apart, and the retaining spring 31 abuts against the axial portion 321 only when the rotation speed of the motor shaft 10 is greater than a certain rotation speed, so that the retaining spring 31 can avoid the friction abutment with the axial portion 321 of the anti-slip sleeve 32 all the time, thereby extending the service life of the anti-slip sleeve 32 or retaining spring 31, reducing the frequency of replacing the anti-slip sleeve 32 or retaining spring 31, and reducing the maintenance cost and material cost.

[0041] In addition, the axial length of the axial portion 321 is greater than the axial length of the stepped hole 21 of the gear 20, so that one axial end of the axial portion 321 can be located outside the stepped hole 21. In this way, when the anti-detachment sleeve 32 is removed, the axial portion 321 extends out of the stepped hole 21, which facilitates the removal of the anti-detachment sleeve 32.

[0042] Furthermore, if Figures 1 to 5 As shown, the radial portion 322 is located at one axial end of the axial portion 321 away from the retaining ring 31. Since one axial end of the axial portion 321 is located outside the stepped hole 21, the radial portion 322 is also located outside the stepped hole 21, and the radial portion 322 is folded toward the radial outer side or radial inner side of the axial portion 321. By providing the radial portion 322, when disassembling the anti-detachment sleeve 32, the radial portion 322 can be clamped or pried, so that the axial portion 321 of the anti-detachment sleeve 32 is quickly separated from the stepped hole 21 of the gear 20, and the radial limiting effect of the anti-detachment sleeve 32 on the retaining ring 31 is released. Therefore, the radial portion 322 can be more conducive to the disassembly of the anti-detachment sleeve 32.

[0043] In the first embodiment, if Figures 1 to 3 As shown, the radial portion 322 of the anti-dropping sleeve 32 can be folded radially outward, and the radial portion 322 and the outer end surface 23 of the gear 20 are spaced apart in the axial direction.

[0044] The radial portion 322 and the gear 20 arranged at an axial interval can avoid the contact wear of the anti-dropping sleeve 32 on the outer end surface 23 of the gear 20 shaft, thereby extending the service life of the gear 20 and the anti-dropping sleeve 32. In addition, when disassembling the anti-dropping sleeve 32, a disassembly tool can be inserted through the gap between the radial portion 322 and the outer end surface 23 of the gear 20, and used to pry the radial portion 322 of the anti-dropping sleeve 32, so that the axial portion 321 is separated from the stepped hole 21 of the gear 20, and the axial limit between the anti-dropping sleeve 32 and the gear 20 is released, as well as the radial limit effect of the anti-dropping sleeve 32 on the retaining ring 31.

[0045] In the second embodiment, if Figure 4 and Figure 5 As shown, the radial portion 322 is folded toward the radial inner side of the axial portion 321 , and the radial end surface of the radial portion 322 is also spaced apart from the outer wall of the motor shaft 10 .

[0046] The radial portion 322 and the motor shaft 10 arranged at radial intervals can avoid the contact and wear of the anti-drop sleeve 32 on the motor shaft 10, thereby extending the service life of the motor shaft 10 and the anti-drop sleeve 32. In addition, when disassembling the anti-drop sleeve 32, a disassembly tool can be inserted through the radial gap between the radial portion 322 and the motor shaft 10, and used to pry the radial portion 322 of the anti-drop sleeve 32, so that the axial portion 321 is separated from the stepped hole 21 of the gear 20, and the axial limit between the anti-drop sleeve 32 and the gear 20 is released, and the radial limit effect of the anti-drop sleeve 32 on the retaining ring 31 is released.

[0047] In the first embodiment and the second embodiment, the axial portion 321 can be interference fit with the inner wall of the stepped hole 21 of the gear 20. The radial portion 322 and the axial portion 321 in the first embodiment and the second embodiment can be integrally formed by a stainless steel ring. The anti-drop sleeve 32 made of the stainless steel ring has high strength and is interference fit with the inner wall 24 of the stepped hole 21 of the gear 20 to achieve a fixed connection between the anti-drop sleeve 32 and the gear 20, and further achieves axial limitation of the anti-drop sleeve 32 and the gear 20.

[0048] Preferably, the anti-dropout sleeve 32 can be directly produced by machining. Although the number of anti-dropout sleeves 32 produced by machining is small, the precision of the anti-dropout sleeves 32 is high.

[0049] In the first embodiment and the second embodiment, the radial portion 322 may be provided with a weight-reducing hole 323, and the weight-reducing hole 323 is arranged at 180° with the first notch 311 of the retaining spring 31. That is, the weight-reducing hole 323 and the first notch 311 differ in angle of 180° in the projection in the circumferential direction. The weight-reducing hole 323 is provided to match the weight missing from the first notch 311 of the retaining spring 31, so that the motor shaft 10 is subjected to uniform force in the circumferential direction when rotating at high speed, thereby making the rotation of the motor shaft 10 more stable.

[0050] The weight-reducing hole 323 may be a through hole that axially penetrates the radial portion 322, and the size of the weight-reducing hole 323 is related to the size of the first notch 311 of the clip 31, the weight of the clip 31, and the mass of the stainless steel ring. The shape of the weight-reducing hole 323 may be any shape such as a circle, which is not specifically limited here.

[0051] In some other embodiments, the weight-reducing hole 323 may also be a hole that does not penetrate the radial portion 322, and the weight-reducing hole 323 may also be set according to the strength of the radial portion 322, and multiple weight-reducing holes 323 may be set, but the multiple weight-reducing holes 323 are set approximately at 180° to the first notch 311 of the retaining spring 31, thereby ensuring that the motor shaft 10 is uniformly stressed in the circumferential direction when rotating at high speed, making the rotation of the motor shaft 10 more stable.

[0052] In the third embodiment, if Figure 6 As shown, the anti-drop sleeve 32 includes a second notch 324 and a weighted protrusion 325, and the weighted protrusion 325 is set at 180° with the second notch 324. When the anti-drop sleeve 32 and the retaining spring 31 are assembled on the outer wall, the weighted protrusion 325 of the anti-drop sleeve 32 is located in the first notch 311 of the retaining spring 31.

[0053] Specifically, the second notch 324 of the anti-dropout sleeve 32 is substantially the same as the first notch 311 of the retaining spring 31, and the second notch 324 makes the anti-dropout sleeve 32 also substantially C-shaped in the circumferential direction W. The second notch 324 of the anti-dropout sleeve 32 and the first notch 311 of the retaining spring 31 are arranged at 180° in the circumferential direction W, and the second notch 324 can play a role in reducing weight, and is used to balance the weight of the entire retaining spring anti-dropout device 30 in the circumferential direction W, so that the motor shaft 10 is more stable when rotating at high speed.

[0054] Furthermore, the weight-increasing protrusion 325 and the second notch 324 are arranged at 180 degrees, and the weight-increasing protrusion 325 can be located at the other axial end of the axial portion 321, that is, the weight-increasing protrusion 325 and the first notch 311 of the retaining spring 31 are at the same position. Figure 8 As shown, the weighted protrusion 325 can be inserted into the first notch 311 of the retaining spring 31 .

[0055] In this way, by means of the weighted protrusion 325 being clamped into the first notch 311 of the retaining spring 31, the relative position between the anti-dropping sleeve 32 and the retaining spring 31 in the circumferential direction W can be limited, so that the second notch 324 of the anti-dropping sleeve 32 and the first notch 311 of the retaining spring 31 can always maintain 180° in the circumferential direction W. Under certain circumstances, the anti-dropping sleeve 32 can drive the retaining spring 31 to rotate in the circumferential direction W through the weighted protrusion 325, but there will be no relative rotation between the anti-dropping sleeve 32 and the retaining spring 31, so as to avoid the second notch 324 of the anti-dropping sleeve 32 and the first notch 311 of the retaining spring 31 being misaligned in the circumferential direction W. The retaining spring 31 anti-dropping device of this embodiment can ensure that the mass of the entire retaining spring anti-dropping device 30 in the circumferential direction W remains balanced, so that the motor shaft 10 can rotate more smoothly at high speed.

[0056] In addition, it should be noted that when the anti-drop sleeve 32 has a weight-increasing protrusion 325, the anti-drop sleeve 32 may no longer be provided with the second notch 324, or the circumferential size of the second notch 324 of the anti-drop sleeve 32 may be balanced and adjusted according to the size of the weight-increasing protrusion 325 and the first notch 311 of the retaining spring 31.

[0057] In addition, the position and number of the weight-increasing protrusions 325 in the embodiment of the present disclosure are merely exemplary. In some other embodiments, multiple weight-increasing protrusions 325 may be provided, and the number and size of the weight-increasing protrusions 325 are balanced or matched with the weight and position missing from the second notch 324 of the anti-detachment sleeve 32 and the weight and position missing from the first notch 311 of the retaining spring 31, thereby keeping the mass and force of the entire retaining spring anti-detachment device 30 in the circumferential direction W balanced, thereby making the motor shaft 10 more stable, more stable and safer when rotating at high speed.

[0058] In the third embodiment, if Fig.11 As shown, the stainless steel strip 40 can be formed into an integrally formed anti-drop sleeve 32 through a stamping process and a bending process. The anti-drop sleeve 32 is stamped from the stainless steel strip 40 to form a plurality of convex blanks 41, the convex blanks 41 include a circumferential portion 411 and a raised portion 412, the circumferential portion 411 is bent in the circumferential direction W to form an anti-drop sleeve 32 having a second notch 324, and the raised portion 412 is further bent radially inward to form a weighted protrusion 325.

[0059] Specifically, Fig.10 As shown, the stainless steel belt 40 is in the shape of a long strip. Fig.10 4 shows a plurality of convex-shaped blanks 41 of identical shape and size, the circumferential portions 411 of the convex-shaped blanks 41 are arranged in a row along the width direction of the stainless steel strip 40, and are staggered along the length direction of the stainless steel strip. The circumferential portions 411 of the two convex-shaped blanks 41 are equal in width, and the width of the stainless steel strip is equal to the sum of the widths of the axial portions 321 of the two convex-shaped blanks 41.

[0060] In addition, by Fig.10 It can be seen that the raised portion 412 of the convex-shaped blank 41 on the left is located between the circumferential portions 411 of the two convex-shaped blanks 41 on the right, and the width of the raised portion 412 is equal to the width of the circumferential portion 411. It can be seen that when a plurality of convex-shaped blanks 41 are stamped from a stainless steel strip 40, the stainless steel strip can be fully utilized to avoid material waste and reduce costs.

[0061] Furthermore, after the convex-shaped blank 41 is formed by stamping and cutting, the circumferential portion 411 of the convex-shaped blank 41 is bent along the circumferential direction W to form the anti-dropping sleeve 32, and the protruding portion 412 of the convex-shaped blank 41 is bent radially inward to form the weight-increasing protrusion 325. It can be seen that the anti-dropping sleeve 32 in the third embodiment has a simple structure, and a plurality of convex-shaped blanks 41 can be manufactured simultaneously by a stamping process, the manufacturing process is simple, and mass production can be carried out, thereby reducing the production cost.

[0062] It should be noted that the orientation and position relationships represented by "left", "right", "width direction" and "length direction" are only based on Fig.10 The orientation and position relationships shown are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the stainless steel belt 40 must have a specific orientation, be constructed and operate in a specific orientation.

[0063] Furthermore, the hardness and strength of the stainless steel band 40 are both lower than those of the stainless steel ring. The anti-drop sleeve 32 made of the stainless steel band 40 has high elasticity, and the anti-drop sleeve 32 made of the stainless steel band 40 has a second notch 324. The anti-drop sleeve 32 can be elastically deformed in the circumferential direction W. Therefore, the anti-drop sleeve 32 made of the stainless steel band 40 cannot be fitted with the inner wall 24 of the gear 20 by interference, thereby limiting the axial position of the anti-drop sleeve 32. Therefore, in order to change the relative position of the anti-drop sleeve 32 and the gear 20 in the axial direction A, in some embodiments, such as Figure 8 As shown, a hook 326 is provided at the other axial end of the axial portion 321 close to the retaining spring 31 , and a slot 25 is provided on the inner wall of the stepped hole 21 of the gear 20 . The hook 326 is inserted into the slot 25 to limit the axial movement of the anti-drop sleeve 32 .

[0064] Among them, the hook 326 is inclined and bent toward the radial outer side and the other axial end of the axial portion 321, and an inclined groove 25 is also formed at the corner between the inner end face 22 and the inner wall of the gear 20. The shape and extension direction of the groove 25 match the hook 326. When the anti-drop sleeve 32 is inserted into the stepped hole 21 of the gear 20, the axial portion 321 of the anti-drop sleeve 32 is elastically deformed in the circumferential direction W. After the hook 326 of the anti-drop sleeve 32 reaches the position of the groove 25 of the gear 20, the anti-drop sleeve 32 rebounds along the circumferential direction, so that the hook 326 of the axial portion 321 of the anti-drop sleeve 32 is inserted into the groove 25 of the gear 20, thereby limiting the axial position of the anti-drop sleeve 32 and preventing it from being thrown out under the action of inertia when the motor shaft 10 rotates at high speed.

[0065] It is to be understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0066] It is further understood that the terms "first", "second", etc. are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish structures of the same type from each other, and do not indicate a specific order or importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, a first structure can also be referred to as a second structure, and similarly, a second structure can also be referred to as a first structure.

[0067] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following scope of rights.

[0068] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A retaining spring anti-disengagement device (30), characterized in that: include: The clamping spring (31) comprises a first notch (311); as well as An anti-slip sleeve (32) is sleeved on the radial outer side of the retaining spring (31) and axially covers the first notch (311) of the retaining spring (31) to limit the radial movement of the retaining spring (31).

2. The retaining spring anti-disengagement device (30) according to claim 1, characterized in that: The anti-drop sleeve (32) comprises: an axial portion (321), wherein the axial portion (321) is sleeved on the radially outer side of the retaining spring (31) and is radially spaced from the outer wall of the retaining spring (31); and A radial portion (322), the radial portion (322) is located at an axial end of the axial portion (321) away from the retaining spring (31), and the radial portion (322) is folded toward the radial outer side or the radial inner side of the axial portion (321).

3. The retaining spring anti-detachment device (30) according to claim 1 or 2, characterized in that: The anti-drop sleeve (32) comprises: a second notch (324); and A weight-increasing protrusion (325), wherein the weight-increasing protrusion (325) and the second notch (324) are arranged at an angle of 180 degrees, and the weight-increasing protrusion (325) is located in the first notch (311) of the retaining ring (31).

4. The retaining spring anti-disengagement device (30) according to claim 3, characterized in that: The anti-drop sleeve (32) is formed by stamping a stainless steel strip (40) into a plurality of convex-shaped blanks (41), wherein the convex-shaped blank (41) comprises a circumferential portion (411) and a raised portion (412), wherein the circumferential portion (411) is circumferentially bent to form the anti-drop sleeve (32) having the second notch (324), and the raised portion (412) is further radially bent inward to form the weight-increasing protrusion (325).

5. The retaining spring anti-disengagement device (30) according to claim 2, characterized in that: The radial portion (322) is provided with a weight-reducing hole (323), and the weight-reducing hole (323) is arranged at an angle of 180° to the first notch (311) of the retaining ring (31).

6. An automobile motor shaft assembly (100), characterized in that: include: A motor shaft (10), wherein an outer wall of the motor shaft (10) is provided with an annular retaining ring groove (11); A gear (20), the gear (20) being sleeved on the outside of the motor shaft (10) in a torsion-resistant manner, a stepped hole (21) being provided at one axial end of the gear (20), the stepped hole (21) forming an inner end surface (22) and an outer end surface (23) of the gear (20), the retaining ring groove (11) being axially located between the inner end surface (22) and the outer end surface (23), and one end of the retaining ring groove (11) being aligned with the inner end surface (22); According to the retaining spring anti-disengagement device (30) as described in any one of claims 1 to 5, the retaining spring (31) is engaged in the retaining spring groove (11) and abuts against the inner end surface (22) of the gear (20), and the anti-disengagement sleeve (32) is axially fixed to the gear (20).

7. The automotive motor shaft assembly (100) according to claim 6, characterized in that: The anti-drop sleeve (32) comprises: an axial portion (321), wherein the axial portion (321) is sleeved on the radially outer side of the retaining spring (31) and is radially spaced from the outer wall of the retaining spring (31); and A radial portion (322), wherein the radial portion (322) is located at an axial end of the axial portion (321) away from the retaining spring (31), and the radial portion (322) is folded toward the radial outside or radial inside of the axial portion (321), and the radial portion (322) is spaced apart from the outer end surface (23) of the gear (20) in the axial direction.

8. The automotive motor shaft assembly (100) according to claim 7, characterized in that: The radial portion (322) is folded radially inwardly of the axial portion (321), and a radial end surface of the radial portion (322) is spaced apart from an outer wall of the motor shaft (10).

9. The automotive motor shaft assembly (100) according to claim 8, characterized in that: A hook (320) is provided at the other axial end of the axial portion (321) close to the retaining spring (31), and a groove (25) is provided on the inner wall (24) of the stepped hole (21) of the gear (20), and the hook (320) is inserted into the groove (25) to limit the axial movement of the anti-drop sleeve (32).

10. The automotive motor shaft assembly (100) according to claim 7, characterized in that: The axial portion (321) is interference-fitted with the stepped hole (21) of the gear (20).

Images