Output rotating shaft assembly, driver and outside rear-view mirror

Abstract

The utility model relates to an output rotating shaft assembly which comprises an output rotating shaft, a transmission gear and a clutch spring, the output rotating shaft is suitable for being used as a driving force output shaft of an outside rear-view mirror driver, the output rotating shaft comprises a first shaft section and a second shaft section, and the first shaft section is used for being connected with a mirror bracket or a mirror shell of an outside rear-view mirror. The second shaft section is sleeved with the transmission gear in an empty mode, and the clutch spring is of an annular structure with a fracture. The inner side face of the clutch spring makes contact with the outer circumferential face of the second shaft section, a first protruding part inserted into the fracture is arranged on the transmission gear, or the outer side face of the clutch spring makes contact with the inner circumferential face of the transmission gear, and a second protruding part inserted into the fracture is arranged on the second shaft section. The utility model further provides a driver and an outside rear-view mirror. The gear transmission structure in the outside rear-view mirror driver can be prevented from being overloaded when the outside rear-view mirror is impacted or pulled by large external force, and the gear transmission structure has the advantages of being easy to arrange and stable in operation.

Description

Technical Field

[0001] This utility model relates to the field of vehicle rearview mirror technology, specifically to an output shaft assembly, a driver, and an exterior rearview mirror. Background Technology

[0002] Some vehicles use an integrated actuator for their exterior rearview mirrors. This integrated actuator can drive the mirror housing and lens to rotate together around both the vertical and horizontal axes. The rotation of the mirror housing and lens together around the vertical axis allows for folding of the exterior rearview mirror to meet the need for it to be folded closer to the vehicle body. The rotation of the mirror housing and lens together around both the vertical and horizontal axes allows for adjustment of the mirror's orientation to meet the driver's rearview angle adjustment needs.

[0003] This integrated actuator typically includes an output shaft that supplies rotation to the exterior rearview mirror's housing and lens, driving them to rotate together around a horizontal axis. The output shaft and the internal motor of the integrated actuator usually use a gear transmission mechanism. When the exterior rearview mirror's housing and lens are subjected to significant external impact or actuation while rotating around the horizontal axis, the gear transmission mechanism is prone to wear. Therefore, a clutch structure is usually required at the output shaft to prevent overload of the gear transmission mechanism when the exterior rearview mirror is subjected to significant external impact or actuation.

[0004] The following technical problems may exist in setting a clutch structure at the output shaft of an integrated drive: the integrated drive has a high degree of integration, the space at the output shaft is limited, the rotation angle of the output shaft of the integrated drive is small, it is difficult to arrange a conventional clutch structure at the output shaft, and arranging a conventional clutch structure at the output shaft may lead to unstable operation. Utility Model Content

[0005] The purpose of this invention is to provide an output shaft assembly, a driver, and an exterior rearview mirror to alleviate or eliminate at least one of the aforementioned technical problems.

[0006] The present invention provides an output shaft assembly, comprising an output shaft, a transmission gear, and a clutch spring. The output shaft is adapted to serve as a driving force output shaft for an exterior rearview mirror driver. The output shaft includes a first shaft segment and a second shaft segment. The first shaft segment is used to connect with the mirror bracket or mirror housing of the exterior rearview mirror. The transmission gear is loosely fitted on the second shaft segment. The clutch spring is a ring structure with a break.

[0007] The inner surface of the clutch spring contacts the outer peripheral surface of the second shaft segment, and the transmission gear is provided with a first protrusion that inserts into the break.

[0008] Alternatively, the outer surface of the clutch spring contacts the inner circumferential surface of the transmission gear, and the second shaft segment is provided with a second protrusion that inserts into the break.

[0009] Optionally, the clutch spring includes a main body and two ends located on both sides of the break.

[0010] The outer surface of the main body contacts the inner circumferential surface of the transmission gear, and the outer surfaces of the two ends are spaced apart from the inner circumferential surface of the transmission gear. The outer surfaces of the two ends smoothly transition into the outer surface of the main body.

[0011] Alternatively, the inner surface of the main body is in contact with the outer peripheral surface of the second shaft segment, the inner surfaces of the two ends are spaced apart from the outer peripheral surface of the second shaft segment, and the inner surfaces of the two ends are smoothly transitioned to the inner surface of the main body.

[0012] Optionally, the two ends extend obliquely relative to the extension direction of the main body, and the two ends and the main body are transitioned by an arc-shaped portion.

[0013] Optionally, the outer side of the main body portion contacts the inner circumferential surface of the transmission gear, and the inner side of the main body portion is spaced apart from the outer circumferential surface of the second shaft segment; or, the inner side of the main body portion contacts the outer circumferential surface of the second shaft segment, and the outer side of the main body portion is spaced apart from the inner circumferential surface of the transmission gear.

[0014] Optionally, the output shaft includes a third shaft segment and a fourth shaft segment located on both sides of the second shaft segment, and the transmission gear is rotatably supported on the third shaft segment and the fourth shaft segment.

[0015] Optionally, a first axial limiting surface is provided on the third shaft segment, and a second axial limiting surface is provided on the transmission gear. The first axial limiting surface and the second axial limiting surface are respectively located on both sides of the clutch spring, and the first axial limiting surface and the second axial limiting surface are used to axially limit the clutch spring.

[0016] Optionally, the output shaft assembly further includes a mounting base adapted for fixed mounting on the driver housing, the mounting base having a support hole, the output shaft including a fifth shaft segment rotatably supported in the support hole, the second shaft segment being located on one side of the support hole, and the first shaft segment being adapted to extend to the other side of the support hole; a rotation range limiting structure is provided between the output shaft and the mounting base, the rotation range limiting structure being used to limit the rotation range of the output shaft relative to the mounting base; an axial limiting structure is provided between the output shaft and the mounting base.

[0017] Optionally, the output shaft assembly further includes a carbon brush arm circumferentially fixed to the output shaft.

[0018] This utility model also proposes a driver, including a driver housing, a motor, a gear transmission mechanism, and an output shaft assembly as described in any of the above. The output shaft is rotatably supported in the driver housing. The motor, the gear transmission mechanism, the second shaft segment, the clutch spring, and the transmission gear are all located in the inner cavity of the driver housing. The output end of the motor is connected to the transmission gear through the gear transmission mechanism. The first shaft segment extends to the outside of the driver housing.

[0019] This utility model also proposes an exterior rearview mirror, including the aforementioned driver.

[0020] This invention, by incorporating a clutch spring between the output shaft and the transmission gear, prevents overload of the gear transmission structure in the exterior rearview mirror driver when subjected to significant external impact or manipulation, thus preventing gear damage and providing protection for manual emergency adjustment of the exterior rearview mirror driver. The invention features a rationally designed clutch spring structure and mounting configuration, requiring minimal space at the output shaft. It also satisfies the clutch requirements between the output shaft and the transmission gear even with small shaft rotation angles, offering advantages such as ease of installation and stable operation. Attached Figure Description

[0021] Figure 1 This is an exploded view of the output shaft assembly described in some embodiments;

[0022] Figure 2 This is a cross-sectional view of the output shaft assembly described in some embodiments;

[0023] Figure 3 This is a cross-sectional view of the output shaft assembly described in some embodiments;

[0024] Figure 4 This is an exploded view of the output shaft assembly described in some embodiments;

[0025] Figure 5 This is a schematic diagram of the output shaft assembly described in some embodiments;

[0026] Figure 6 This is a schematic diagram of the transmission gear described in some embodiments;

[0027] Figure 7 This is a schematic diagram of the output shaft assembly described in some embodiments;

[0028] Figure 8 This is an exploded view of the transmission gear described in some embodiments;

[0029] Figure 9 This is a cross-sectional view of the driver described in some embodiments;

[0030] Figure 10 This is a structural diagram of the driver portion structure described in some embodiments.

[0031] Among them, 1-output shaft; 2-transmission gear; 3-clutch spring; 4-carbon brush arm; 5-mounting base; 6-bottom shell; 7-top cover; 8-second worm gear; 9-motor; 10-first gear;

[0032] 101-first shaft section; 102-second shaft section; 103-fifth shaft section; 104-fourth shaft section; 105-third shaft section; 106-sixth shaft section; 107-third convex part; 108-second convex part; 109-fourth convex part;

[0033] 201-Gear body; 202-Support sleeve; 203-Helical tooth; 204-Inner circumferential surface; 205-First protrusion; 206-Positioning groove; 207-Sleeve body; 208-Supporting surface; 209-Positioning tooth;

[0034] 301 - Outer surface; 302 - Inner surface; 303 - Fracture surface; 304 - End;

[0035] 401 - Annular part; 402 - Protrusion; 403 - Pin; 404 - Keyway;

[0036] 501-Annular seat; 502-Support hole; 503-Annular groove; 504-Limiting surface; 505-Plug-in part. Detailed Implementation

[0037] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0038] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0039] like Figure 1 and Figure 2 The illustrated output shaft assembly includes an output shaft 1, a transmission gear 2, and a clutch spring 3. The output shaft 1 is adapted to serve as the driving force output shaft for an exterior rearview mirror actuator. The output shaft 1 includes a first shaft section 101 and a second shaft section 102. The first shaft section 101 is used to connect with the mirror bracket or mirror housing of the exterior rearview mirror. The transmission gear 2 is loosely fitted onto the second shaft section 102. The clutch spring 3 is an annular structure with a break 303. The inner surface of the clutch spring 3 contacts the outer peripheral surface of the second shaft section 102. The transmission gear 2 is provided with a first protrusion 205 that inserts into the break 303.

[0040] Using the above technical solution, the clutch spring 3 forms a clutch structure between the transmission gear 2 and the output shaft 1. The first protrusion 205 on the transmission gear 2 is inserted into the break 303, so that the transmission gear 2 and the clutch spring 3 are circumferentially connected, and the transmission gear 2 and the clutch spring 3 rotate synchronously. The inner surface of the clutch spring 3 contacts the outer peripheral surface of the second shaft segment 102, and the friction between the inner surface of the clutch spring 3 and the outer peripheral surface of the second shaft segment 102 keeps the clutch spring 3 and the second shaft segment 102 in an engaged state.

[0041] When the output shaft assembly is used in the exterior rearview mirror driver, the driving force output by the motor inside the driver is transmitted to the transmission gear 2 through the gear transmission mechanism. When the clutch spring 3 and the second shaft section 102 are engaged, the driving force can be transmitted to the output shaft 1 through the transmission gear 2 and the clutch spring 3. The output shaft 1 can output the driving force to the mirror bracket or mirror housing of the exterior rearview mirror to drive the mirror housing and lens of the exterior rearview mirror to rotate around the axis of the output shaft 1, thereby realizing the steering adjustment of the exterior rearview mirror surface and meeting the driver's needs for rearview angle adjustment.

[0042] When the outer casing and lens of the exterior rearview mirror are subjected to a large impact or movement, the transmission gear 2 is in a self-locking stationary state. When the external force on the output shaft 1 is so great that frictional slippage occurs between the clutch spring 3 and the second shaft section 102, the output shaft 1 can rotate relative to the transmission gear 2 and clutch spring 3. This provides overload protection for the transmission gear 2 and the gear transmission mechanism, preventing tooth damage. For example, during manual emergency adjustment of the exterior rearview mirror, frictional slippage occurs between the clutch spring 3 and the second shaft section 102, providing overload protection for the transmission gear 2 and the gear transmission mechanism, preventing tooth damage.

[0043] In other words, in the above technical solution, by setting a clutch spring 3 between the output shaft 1 and the transmission gear 2, the gear transmission structure in the external rearview mirror driver can be prevented from overloading when the external rearview mirror is subjected to a large external force impact or manipulation, thus preventing tooth damage in the external rearview mirror driver and achieving protection for manual emergency adjustment of the external rearview mirror driver.

[0044] Furthermore, the clutch spring 3 is positioned between the inner circumferential surface 204 of the transmission gear 2 and the outer circumferential surface of the second shaft segment 102, requiring less space at the output shaft 1 and being easy to install. The clutch spring 3 utilizes the friction between its inner surface and the outer circumferential surface of the second shaft segment 102 to achieve engagement, thus satisfying the engagement / disengagement requirements between the output shaft 1 and the transmission gear 2 even when the rotation angle of the output shaft 1 is small.

[0045] In the aforementioned output shaft assembly, the clutch function is achieved through the contact and relative sliding between the inner surface of the clutch spring 3 and the outer peripheral surface of the second shaft segment 102. Obviously, in practical implementation, the clutch function can also be achieved through the contact and relative sliding between the outer surface of the clutch spring 3 and the inner peripheral surface 204 of the transmission gear 2. For example... Figure 3 and Figure 4 As shown, in some other embodiments, the outer surface of the clutch spring 3 contacts the inner circumferential surface 204 of the transmission gear 2, and a second protrusion 108 is provided on the second shaft segment 102 for insertion into the break 303. The second protrusion 108 on the second shaft segment 102 is inserted into the break 303, so that the second shaft segment 102 and the clutch spring 3 are circumferentially connected, and the clutch spring 3 rotates synchronously with the output shaft 1. The outer surface of the clutch spring 3 contacts the inner circumferential surface 204 of the transmission gear 2, and the friction between the outer surface of the clutch spring 3 and the inner circumferential surface 204 of the transmission gear 2 keeps the clutch spring 3 and the transmission gear 2 in an engaged state.

[0046] In practical implementation, the frictional characteristics between the clutch spring 3 and the surface in frictional contact with it can be calibrated according to the design requirements of the drive. The frictional characteristics between the clutch spring 3 and the surface in frictional contact with it can be adjusted by adjusting the magnitude of the spring force of the clutch spring 3. For example, the magnitude of the frictional force between the clutch spring 3 and the surface in frictional contact with it can be adjusted by adjusting the magnitude of the spring force of the clutch spring 3.

[0047] In some embodiments, such as Figure 3 and Figure 4As shown, the clutch spring 3 includes a main body and two ends 304 located on either side of the break 303. The two ends 304 are spaced apart, and the opening between the two ends 304 is the aforementioned break 303. The outer surface 301 of the main body contacts the inner circumferential surface 204 of the transmission gear 2. That is, the outer surface of the clutch spring 3 contacts the inner circumferential surface 204 of the transmission gear 2 by utilizing the contact between the outer surface 301 of the main body and the inner circumferential surface 204 of the transmission gear 2. The outer surfaces of the two ends 304 are spaced apart from the inner circumferential surface 204 of the transmission gear 2, and there is a smooth transition between the outer surfaces of the two ends 304 and the outer surface 301 of the main body. By adopting the above technical solution, it is possible to prevent the end faces of the two ends 304 from scratching the inner circumferential surface 204 of the transmission gear 2, and to ensure the stability of the frictional force between the outer surface 301 of the main body and the inner circumferential surface 204 of the transmission gear 2, making the clutch engagement quality of the clutch structure more stable, thereby ensuring the stable operation of the output shaft assembly.

[0048] In some embodiments, such as Figure 1 and Figure 2 As shown, the clutch spring 3 includes a main body and two ends 304 located on both sides of the break 303. The inner surface 302 of the main body contacts the outer peripheral surface of the second shaft segment 102. That is, the contact between the inner surface of the clutch spring 3 and the outer peripheral surface of the second shaft segment 102 is achieved by utilizing the contact between the inner surface of the main body 302 and the outer peripheral surface of the second shaft segment 102. The inner surfaces of the two ends 304 are spaced apart from the outer peripheral surface of the second shaft segment 102, and there is a smooth transition between the inner surfaces of the two ends 304 and the inner surface of the main body 302. This technical solution prevents the end faces of the two ends 304 from scratching the outer peripheral surface of the second shaft segment 102, ensuring the stability of the frictional force between the inner surface of the main body 302 and the outer peripheral surface of the second shaft segment 102, making the clutch engagement quality of the clutch structure more stable, and thus ensuring the stable operation of the output shaft assembly.

[0049] In some embodiments, the two ends 304 extend obliquely relative to the extending direction of the main body portion, and the two ends 304 and the main body portion are transitioned by an arc-shaped portion, which is easy to implement. As a specific example, such as Figure 3 As shown, when the outer surface 301 of the main body contacts the inner circumferential surface 204 of the transmission gear 2 to achieve contact between the outer surface of the clutch spring 3 and the inner circumferential surface 204 of the transmission gear 2, the two ends 304 extend obliquely towards the outer circumferential surface of the second shaft segment 102, so that the outer surfaces of the two ends 304 and the inner circumferential surface 204 of the transmission gear 2 are spaced apart from each other, and the outer surface of the arc-shaped portion smoothly transitions between the outer surface 301 of the main body and the outer surface of the ends 304. As another specific example, such as Figure 2As shown, when the inner side surface 302 of the main body contacts the outer peripheral surface of the second shaft segment 102 to achieve contact between the inner side surface of the clutch spring 3 and the outer peripheral surface of the second shaft segment 102, the two ends 304 extend obliquely towards the inner peripheral surface 204 of the transmission gear 2, so that the inner side surfaces of the two ends 304 and the outer peripheral surface of the second shaft segment 102 are spaced apart from each other, and the inner side surface of the arc-shaped portion smoothly transitions between the inner side surface 302 of the main body and the inner side surface of the ends 304.

[0050] In some embodiments, the outer side 301 of the main body contacts the inner circumferential surface 204 of the transmission gear 2. That is, the outer side of the clutch spring 3 contacts the inner circumferential surface 204 of the transmission gear 2 by using the contact between the outer side 301 of the main body and the inner circumferential surface 204 of the transmission gear 2. At this time, the inner side 302 of the main body and the outer circumferential surface of the second shaft segment 102 are spaced apart from each other, which can reduce the assembly difficulty.

[0051] In some embodiments, the inner side surface 302 of the main body is in contact with the outer peripheral surface of the second shaft segment 102. That is, the contact between the inner side surface of the clutch spring 3 and the outer peripheral surface of the second shaft segment 102 is achieved by using the contact between the inner side surface 302 of the main body and the outer peripheral surface of the second shaft segment 102. The outer side surface 301 of the main body and the inner peripheral surface 204 of the transmission gear 2 are spaced apart from each other, which can reduce the assembly difficulty.

[0052] In practice, the width of the first protrusion 205 is usually matched with the width of the fracture 303. That is, when the first protrusion 205 is inserted into the fracture 303, it is held between the two ends 304. Similarly, the width of the second protrusion 108 is usually matched with the width of the fracture 303. That is, when the second protrusion 108 is inserted into the fracture 303, it is held between the two ends 304.

[0053] In some embodiments, such as Figure 1 and Figure 4 As shown, the output shaft 1 includes a third shaft segment 105 and a fourth shaft segment 104 located on both sides of the second shaft segment 102, respectively. The transmission gear 2 is rotatably supported on the third shaft segment 105 and the fourth shaft segment 104. By supporting the transmission gear 2 through the third shaft segment 105 and the fourth shaft segment 104, a concentric and stable pivot connection is achieved between the transmission gear 2 and the output shaft 1, ensuring the stability of the frictional force between the transmission gear 2 and the clutch spring 3. In a specific implementation, the inner circumferential surfaces at both ends of the central hole of the transmission gear 2 mate with the third shaft segment 105 and the fourth shaft segment 104, respectively, so that the transmission gear 2 is rotatably supported on the third shaft segment 105 and the fourth shaft segment 104. The axial position of the inner circumferential surface of the middle section of the central hole of the transmission gear 2 corresponds to the circumferential position of the clutch spring 3.

[0054] In some embodiments, a first axial limiting surface is provided on the third shaft segment 105, and a second axial limiting surface is provided on the transmission gear 2. The first and second axial limiting surfaces are located on both sides of the clutch spring 3, respectively, and are used to axially limit the clutch spring 3. Using the first and second axial limiting surfaces to define the axial position of the clutch spring 3 helps to ensure the stable operation of the clutch structure.

[0055] In specific implementation, such as Figure 5 and Figure 6 As shown, the transmission gear 2 can be a one-piece metal component. For example... Figure 7 and Figure 8 As shown, the transmission gear 2 can also adopt a split structure. The transmission gear 2 includes a gear body 201 and a support sleeve 202. One end of the gear body 201 is provided with a positioning groove 206. The support sleeve 202 includes a sleeve body 207 and positioning teeth 209 provided on the outer periphery of the sleeve body 207. The outer periphery surface of the sleeve body 207 mates with the inner periphery surface of one end of the gear body 201. The positioning teeth 209 mate with the positioning groove 206 to achieve the positioning connection between the support sleeve 202 and the gear body 201. The inner periphery surface of the sleeve body 207 is the support surface 208 for mates with the outer periphery surface of the fourth shaft segment 104. The gear body 201 can be made of metal, and the support sleeve 202 can be made of plastic. The support sleeve 202 made of plastic has the characteristics of being lightweight and low cost. The transmission gear 2 made of metal is prone to causing wear on the output shaft 1 made of plastic, while the wear between the support sleeve 202 made of plastic and the output shaft 1 made of plastic is smaller and the friction is more stable. The end face of the sleeve 207 on the side near the clutch spring 3 is the second axial limiting surface.

[0056] In some embodiments, such as Figure 4 and Figure 5 As shown, the output shaft assembly also includes a mounting base 5 suitable for fixed mounting on the driver housing. The annular seat 501 of the mounting base 5 forms a support hole 502. The output shaft 1 includes a fifth shaft segment 103 rotatably supported in the support hole 502. A second shaft segment 102 is located on one side of the support hole 502, and the first shaft segment 101 is adapted to extend to the other side of the support hole 502. By providing the mounting base 5, the restrictions on the driver housing structure can be reduced, which helps to reduce the assembly difficulty of the output shaft assembly.

[0057] In some embodiments, such as Figure 4 and Figure 5As shown, a rotation range limiting structure is provided between the output shaft 1 and the mounting base 5. This structure limits the rotation range of the output shaft 1 relative to the mounting base 5. As a specific example, a radially protruding third protrusion 107 is provided on the output shaft 1, and limiting surfaces 504 are provided on both sides of the third protrusion 107 in the circumferential direction on the mounting base 5. The two limiting surfaces 504 respectively limit the travel endpoint of the third protrusion 107 in two directions, thereby limiting the rotation range of the output shaft 1 relative to the mounting base 5. In a practical implementation, two mutually symmetrical third protrusions 107 can be provided on the output shaft 1, and two limiting surfaces 504 can be provided on the mounting base 5 corresponding to each third protrusion 107.

[0058] In some embodiments, such as Figure 4 and Figure 5 As shown, an axial limiting structure is provided between the output shaft 1 and the mounting base 5. As a specific example, the axial limiting structure includes an annular groove 503 on the mounting base 5 and a sixth shaft segment 106 on the output shaft 1. One end face of the sixth shaft segment 106 contacts the bottom surface of the annular groove 503 to achieve axial limiting between the output shaft 1 and the mounting base 5 in one direction. In a specific implementation, the other end face of the transmission gear 2 can be directly or indirectly supported on the driver housing, and the contact between one end face of the transmission gear 2 and the other end face of the sixth shaft segment 106 can be used to achieve axial limiting of the output shaft 1 in another direction.

[0059] In some embodiments, such as Figure 4 and Figure 5 As shown, the output shaft assembly also includes a carbon brush arm 4 circumferentially fixedly connected to the output shaft 1. In a specific implementation, the carbon brush arm 4 can be mounted on the fourth shaft segment 104. The carbon brush arm 4 includes an annular portion 401, a protruding portion 402 extending radially from the annular portion 401, and a pin 403 disposed on the protruding portion 402. A keyway 404 is provided in the annular portion 401, and a fourth protrusion 109 is provided on the fourth shaft segment 104 for engaging with the keyway 404. The inner circumferential surface of the annular portion 401 engages with the outer circumferential surface of the fourth shaft segment 104, and the fourth protrusion 109 is inserted into the keyway 404 to achieve a circumferential fixed connection between the annular portion 401 and the fourth shaft segment 104. In use, the pin 403 is used to form a pin-groove engagement with the limiting groove of the carbon brush slider of the driver. When the output shaft 1 rotates forward and backward, the pin 403 on the carbon brush arm 4 swings with the output shaft 1. The pin 403 drives the carbon brush slider and carbon brush to make reciprocating linear motion. The linear sliding positioner starts to work and realizes the potential feedback of the rotation angle position signal of the output shaft 1.

[0060] In specific implementation, such as Figure 9As shown, one end face of the carbon brush arm 4 contacts the other end face of the transmission gear 2, and the other end face of the carbon brush arm 4 contacts the driver housing, so that the carbon brush arm 4 is axially constrained between the transmission gear 2 and the driver housing. The carbon brush arm 4 and the output shaft 1 form a rigid connection in both the axial and circumferential directions. That is to say, the transmission gear 2 is indirectly axially supported on the driver housing through the carbon brush arm 4. When the mounting base 5 is fixedly installed on the driver housing, the carbon brush arm 4, the transmission gear 2 and the output shaft 1 are axially constrained between the driver housing and the mounting base 5, and the clutch spring 3 is axially constrained between the transmission gear 2 and the output shaft 1.

[0061] As a specific example, such as Figure 1 and Figure 4 As shown, the first shaft segment 101 is located at one end of the output shaft 1, and the fourth shaft segment 104 is located at the other end of the output shaft 1. The first shaft segment 101, the fifth shaft segment 103, the sixth shaft segment 106, the third shaft segment 105, the second shaft segment 102, and the fourth shaft segment 104 are connected in sequence. The outer diameter of the sixth shaft segment 106 is greater than the outer diameter of the fifth shaft segment 103, the outer diameter of the first shaft segment 101 is less than the outer diameter of the fifth shaft segment 103, the outer diameter of the sixth shaft segment 106 is greater than the outer diameter of the third shaft segment 105, the outer diameter of the third shaft segment 105 is greater than the outer diameter of the second shaft segment 102, the outer diameter of the second shaft segment 102 is greater than the outer diameter of the fourth shaft segment 104, and the third protrusion 107 is provided on the outside of the sixth shaft segment 106. The stepped surface between the third shaft segment 105 and the second shaft segment 102 is the first axial limiting surface, which axially limits the clutch spring. By using the aforementioned output shaft 1 and rationally setting the stepped structure of the output shaft, it is helpful to form a reasonable axial limit and also has the characteristics of easy assembly.

[0062] like Figure 9 and Figure 10 As shown, this utility model also proposes a driver for a vehicle's exterior rearview mirror, including a driver housing, a motor 9, a gear transmission mechanism, and an output shaft assembly as described above. The output shaft 1 is rotatably supported in the driver housing. The motor 9, gear transmission mechanism, second shaft segment 102, clutch spring 3, and transmission gear 2 are all located within the inner cavity of the driver housing. The output end of the motor 9 is connected to the transmission gear 2 via the gear transmission mechanism. The first shaft segment 101 extends to the outside of the driver housing. The gear transmission mechanism includes a first gear and a second gear. The first gear includes a first worm and a first gear 10. The second gear includes a second worm 8 and a second gear. The first gear and the second gear are rotatably supported in the driver housing. The first gear 10 meshes with the output worm of the motor 9, the first worm meshes with the second gear, and the second worm 8 meshes with the transmission gear 2.

[0063] In practical implementation, the driver housing is usually composed of an upper cover 7 and a bottom cover 6. The mounting base 5 is inserted into the upper cover 7 by means of radial insertion along the output rotation. The mounting base 5 is provided with a plug-in part 505 for insertion into the plug-in slot on the upper cover 7.

[0064] The fifth shaft segment 103 on the output shaft 1 is rotatably supported in the mounting base 5, and a part of the fourth shaft segment 104 on the output shaft 1 is rotatably supported in the arc groove of the upper cover 7. The upper cover 7 and the bottom shell 6 are rigidly connected by screws, and the mounting base 5 is fixed between the upper cover 7 and the bottom shell 6. The two support structures of the output shaft 1 support it to rotate in both directions.

[0065] As a preferred example, the transmission gear 2 is a helical gear, and the outer periphery of the transmission gear 2 is provided with helical teeth 203.

[0066] This utility model also proposes an exterior rearview mirror, including the aforementioned driver.

[0067] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model. In the description of this specification, the reference to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., means that a specific feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

Claims

1. An output shaft assembly, characterized in that, The device includes an output shaft, a transmission gear, and a clutch spring. The output shaft is adapted to serve as the driving force output shaft of an exterior rearview mirror driver. The output shaft includes a first shaft section and a second shaft section. The first shaft section is used to connect with the mirror bracket or mirror housing of the exterior rearview mirror. The transmission gear is loosely fitted on the second shaft section. The clutch spring is a ring structure with a break. The inner surface of the clutch spring contacts the outer peripheral surface of the second shaft segment, and the transmission gear is provided with a first protrusion that inserts into the break. Alternatively, the outer surface of the clutch spring contacts the inner circumferential surface of the transmission gear, and the second shaft segment is provided with a second protrusion that inserts into the break.

2. The output shaft assembly according to claim 1, characterized in that, The clutch spring includes a main body and two ends located on both sides of the break. The inner surface of the main body contacts the outer peripheral surface of the second shaft segment, and the inner surfaces of the two ends are spaced apart from the outer peripheral surface of the second shaft segment. The inner surfaces of the two ends smoothly transition into the inner surface of the main body. Alternatively, the outer surface of the main body contacts the inner circumferential surface of the transmission gear, the outer surfaces of the two ends are spaced apart from the inner circumferential surface of the transmission gear, and there is a smooth transition between the outer surfaces of the two ends and the outer surface of the main body.

3. The output shaft assembly according to claim 2, characterized in that, The two ends extend obliquely relative to the extension direction of the main body, and the two ends and the main body are transitioned by an arc-shaped portion.

4. The output shaft assembly according to claim 2, characterized in that, The inner side of the main body contacts the outer peripheral surface of the second shaft segment, and the outer side of the main body is spaced apart from the inner peripheral surface of the transmission gear; or, the outer side of the main body contacts the inner peripheral surface of the transmission gear, and the inner side of the main body is spaced apart from the outer peripheral surface of the second shaft segment.

5. The output shaft assembly according to claim 1, characterized in that, The output shaft includes a third shaft segment and a fourth shaft segment located on both sides of the second shaft segment, and the transmission gear is rotatably supported on the third shaft segment and the fourth shaft segment.

6. The output shaft assembly according to claim 5, characterized in that, The third shaft segment is provided with a first axial limiting surface, and the transmission gear is provided with a second axial limiting surface. The first axial limiting surface and the second axial limiting surface are respectively located on both sides of the clutch spring. The first axial limiting surface and the second axial limiting surface are used to axially limit the clutch spring.

7. The output shaft assembly according to claim 1, characterized in that, The output shaft assembly further includes a mounting base suitable for fixed mounting on a driver housing, the mounting base having a support hole, the output shaft including a fifth shaft segment rotatably supported in the support hole, a second shaft segment located on one side of the support hole, and a first shaft segment adapted to extend to the other side of the support hole; a rotation range limiting structure is provided between the output shaft and the mounting base, the rotation range limiting structure being used to limit the rotation range of the output shaft relative to the mounting base; an axial limiting structure is provided between the output shaft and the mounting base.

8. The output shaft assembly according to claim 1, characterized in that, The output shaft assembly also includes a carbon brush arm that is circumferentially fixed to the output shaft.

9. A drive for a vehicle's exterior rearview mirror, characterized in that, The device includes a driver housing, a motor, a gear transmission mechanism, and an output shaft assembly as described in any one of claims 1-8. The output shaft is rotatably supported in the driver housing. The motor, the gear transmission mechanism, the second shaft segment, the clutch spring, and the transmission gear are all located in the inner cavity of the driver housing. The output end of the motor is connected to the transmission gear through the gear transmission mechanism. The first shaft segment extends to the outside of the driver housing.

10. An exterior rearview mirror, characterized in that, Includes the driver as described in claim 9.

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