Driving gear and rearview mirror folder

Abstract

The invention relates to the technical field of folders, and discloses a driving gear and a rearview mirror folder.The driving gear comprises a gear ring, a first limiting groove, a fluted disc, oblique teeth and reinforcing ribs, the first limiting groove is concavely formed in the inner side of the gear ring in the radial direction and located at one end of the gear ring in the axial direction, and the fluted disc is convexly arranged on the outer side of the gear ring in the radial direction and located at the other end of the gear ring in the axial direction; the helical teeth are arranged on the outer side of the gear ring in a protruding mode in the radial direction, one ends of the helical teeth in the axial direction are connected with the fluted disc, the other ends of the helical teeth are flush with the end, away from the fluted disc, of the gear ring, the reinforcing ribs are arranged on the outer side of the gear ring in the radial direction in a protruding mode, the reinforcing ribs are located between the adjacent teeth, one ends of the reinforcing ribs are connected with the fluted disc, and the other ends of the reinforcing ribs are connected with the fluted disc. The driving gear can give consideration to both the structural strength and the radial size.

Description

Technical Field

[0001] This application relates to the field of folding mechanism technology, specifically to drive gears and rearview mirror folding mechanisms. Background Technology

[0002] The rearview mirror folding mechanism is used to unfold and retract the vehicle's rearview mirrors. The rotation of the folding mechanism is achieved through internal gears, which therefore need to withstand significant torque. In related technologies, to ensure structural strength, the radial dimension of the gears is relatively large, resulting in a large overall size of the folding mechanism, which cannot meet miniaturization requirements. Reducing the radial dimension, on the other hand, would lead to weak points in the gears due to excessive thinness, resulting in insufficient structural strength. Summary of the Invention

[0003] This application provides a drive gear and a rearview mirror folding device to solve the problem that drive gears are difficult to balance structural strength and radial dimensions.

[0004] In a first aspect, this application provides a drive gear, including a gear ring, a first limiting groove, a gear disc, helical teeth, and reinforcing ribs. The first limiting groove is recessed radially inside the gear ring and located axially at one end of the gear ring. The gear disc protrudes radially outside the gear ring and is located axially at the same end of the gear ring as the first limiting groove. The helical teeth protrude radially outside the gear ring, with one end connected to the gear disc and the other end flush with the end of the gear ring away from the gear disc. The reinforcing ribs protrude radially outside the gear ring, are located between adjacent teeth, and are connected at one end to the gear disc.

[0005] Beneficial effects: In the rearview mirror folding mechanism, the drive gear is connected to the drive motor installed in the housing via helical teeth, thereby driving the housing of the rearview mirror folding mechanism to rotate around the drive gear, realizing the folding or unfolding action. The first limiting groove is used to cooperate with the gear seat to lock and release the housing. On the one hand, the toothed disc at the same end of the first limiting groove can compensate for the radial dimension loss caused by the setting of the first limiting groove, improving structural strength while avoiding increasing the radial dimension of the drive gear. On the other hand, by further adding reinforcing ribs, the radial dimension loss caused by the setting of the first limiting groove can be further compensated while ensuring that the meshing transmission function of the helical teeth is not affected, thus improving structural strength. Therefore, the drive gear can balance structural strength and radial dimension.

[0006] In one alternative embodiment, the drive gear is a powder metallurgy gear.

[0007] Beneficial effects: By using powder metallurgy to manufacture drive gears, the structural strength of the drive gears can be further improved, thereby meeting the requirements for bearing torque loads while maintaining miniaturization; the reinforcing ribs increase the wall thickness, thus reducing defects at the junction of the gear disc and the helical teeth, and improving the manufacturing quality of powder metallurgy.

[0008] In one alternative embodiment, the minimum wall thickness of the drive gear is greater than or equal to 0.6 mm and less than or equal to 1 mm.

[0009] Beneficial effects: The minimum wall thickness of the drive gear is the minimum distance between the surface of the reinforcing rib and the surface of the first limiting groove. By limiting the minimum wall thickness, it helps to reduce process defects that occur in the powder metallurgy process and improve the manufacturing quality of powder metallurgy. By limiting the maximum wall thickness, the first limiting groove can make fuller use of the radial dimension of the gear ring and avoid the radial dimension of the drive gear being too large.

[0010] In one alternative embodiment, the outer diameter of the reinforcing rib gradually decreases from one end connected to the toothed disc to the other end.

[0011] Beneficial effects: In the rearview mirror folding unit, the drive gear and worm gear are connected. By using inclined reinforcing ribs with gradually decreasing outer diameters, the axial dimension of the reinforcing ribs can be increased as much as possible while avoiding the worm gear. This improves the structural strength of the drive gear while ensuring that the meshing transmission function of the helical teeth is not affected.

[0012] In one optional embodiment, the axial dimension of the reinforcing rib is A, the axial dimension of the gear disk is B, the maximum axial depth of the first limiting groove is C1, and the driving gear satisfies A+B>C1.

[0013] Beneficial effect: By setting A+B≥C1, it can be ensured that the gear plate and reinforcing rib cover the first limiting groove in the axial direction, reliably increasing the wall thickness of the drive gear.

[0014] In one optional embodiment, the minimum axial depth of the first limiting groove is C2, and the drive gear satisfies B≤C2.

[0015] Beneficial effects: By setting B≤C2, the axial dimension of the gear disk can be avoided from being too large, which helps to reduce the weight of the drive gear while meeting the structural strength requirements, thus achieving lightweight design.

[0016] In one optional embodiment, a limiting block is further included, which protrudes radially from the inner side of the gear ring and is offset from the first limiting groove. The two ends of the limiting block in the axial direction are flush with the two ends of the gear ring.

[0017] Beneficial effects: In the rearview mirror folding unit, the limiting block is used to limit the rotation range of the drive gear on the gear seat. By making the two ends of the limiting block and the gear ring flush, the axial dimension of the limiting block can be increased, which helps to reduce the radial dimension of the limiting block while maintaining structural strength, thus achieving a lightweight design.

[0018] Secondly, this application also provides a rearview mirror folding device, including a mounting base, a gear seat, a rotating assembly, and a drive gear provided in this application. The mounting base includes a seat body and a rotating shaft with one end disposed on the seat body. The seat body is adapted to be mounted on a vehicle body. The gear seat is sleeved on the outside of the rotating shaft, and one end abuts against the seat body. The drive gear is sleeved on the outside of the gear seat. The rotating assembly includes a housing, a transmission mechanism, and a drive motor. The housing is sleeved on the outside of the rotating shaft and is adapted to mount a rearview mirror. The drive motor is disposed on the housing and is connected to the drive gear through the transmission mechanism. The drive motor can drive the rotating assembly to rotate around the drive gear.

[0019] Beneficial effects: The rearview mirror folding device includes the drive gear provided in this application, and therefore has the corresponding beneficial effects brought about by the drive gear, which will not be elaborated here.

[0020] In one alternative embodiment, the housing forms a transmission chamber, the drive gear and the gear seat are located in the transmission chamber, the end of the drive gear away from the gear disk abuts against the housing, and the gear seat includes a first limiting tooth that protrudes radially from the outside of the gear seat and is adapted to abut against a first limiting groove, the first limiting groove being able to approach or move away from the first limiting tooth along the axial direction to lock or release the housing.

[0021] Beneficial effects: When the first limiting groove is far away from the first limiting tooth, the drive gear presses the housing tightly and locks it to the seat, preventing the housing from rotating accidentally; when the first limiting groove is close to the first limiting tooth, the drive gear moves axially away from the seat, thereby freeing up axial space for the housing to move, allowing the housing to be unlocked and rotated under the action of the drive motor.

[0022] In one alternative embodiment, the drive gear includes a first protrusion that protrudes axially from one end of the gear ring away from the gear disk and is spaced apart circumferentially, and the housing includes a second protrusion that protrudes axially from the side of the housing facing the drive gear and is spaced apart circumferentially, the second protrusion being adapted to abut against the first protrusion.

[0023] Beneficial effects: When the housing is locked, the second protrusion abuts against the first protrusion. During the unlocking process, the second protrusion and the first protrusion are offset, thereby freeing up axial movement space for the housing, reducing the axial movement distance required for the drive gear, helping the worm to stay better in the middle of the drive gear in the axial direction, and improving the force stability of the drive gear during transmission. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the drive gear in an embodiment of this application; Figure 2 for Figure 1 A cross-sectional schematic diagram of the drive gear shown; Figure 3 for Figure 1 The diagram shows the meshing relationship between the drive gear and the external transmission mechanism. Figure 4 for Figure 1 A schematic diagram of the drive gear shown; Figure 5 for Figure 1 A cross-sectional schematic diagram of the drive gear shown; Figure 6 This is a schematic diagram of a rearview mirror folding device according to an embodiment of this application; Figure 7 for Figure 6 An exploded view of the rearview mirror folding mechanism is shown below; Figure 8 for Figure 6 A partial cross-sectional view of the rearview mirror folding mechanism is shown. Figure 9 for Figure 6 A partial schematic diagram of the rearview mirror folding mechanism is shown.

[0026] Explanation of reference numerals in the attached figures: 1. Drive gear; 101. Gear ring; 102. First limiting groove; 103. Gear disc; 104. Helical tooth; 105. Reinforcing rib; 106. Limiting block; 107. First protrusion; 2. Mounting base; 201. Base body; 202. Rotating shaft; 3. Gear seat; 301. First limiting tooth; 4. Housing; 401. First housing; 4011. Second protrusion; 402. Second housing; 403. Third housing; 5. Transmission mechanism. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a," "an," and "comprising" as used herein may also mean including the plural forms. The terms "comprising," "including," and "having" are inclusive and therefore indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0029] Although terms such as "first," "second," etc., may be used in this document to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Furthermore, in the description of this application, unless otherwise expressly specified and limited, the terms "set up" and "connected" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a direct connection or an indirect connection via an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] A rearview mirror folding device is used to install rearview mirrors and can drive the rearview mirrors to unfold or retract relative to the vehicle body. In related technologies, the driver of the rearview mirror folding device is connected to a gear through a transmission mechanism, which drives the rearview mirror folding device to rotate. At this time, the transmission mechanism applies torque to the gear. In some further related technologies, the rearview mirror folding device can also rotate under the action of a large external force (such as manual prying or rotation when impacted). At this time, the transmission mechanism and the gear are self-locking, and the torque is also applied to the gear. Therefore, the gear of the rearview mirror folding device is required to have sufficient strength.

[0031] To improve strength, related technologies often increase the radial dimension of the gears, encroaching on the available space of other structures in the folding mechanism and resulting in an excessively large folding mechanism. Conversely, reducing the radial dimension can lead to weak points in the gears that are too thin, resulting in insufficient structural strength.

[0032] Therefore, gears in related technologies struggle to balance radial dimensions and structural strength.

[0033] The following is combined with Figures 1 to 9 This describes an embodiment of the present application.

[0034] Reference Figure 1 , Figure 2 According to an embodiment of this application, a drive gear 1 is provided, including a gear ring 101, a first limiting groove 102, a gear disk 103, helical teeth 104, and reinforcing ribs 105. The first limiting groove 102 is recessed in the inner side of the gear ring 101 in the radial direction and located at one end of the gear ring 101 in the axial direction. The gear disk 103 is protruded in the outer side of the gear ring 101 in the radial direction and is located at the same end of the gear ring 101 in the axial direction as the first limiting groove 102. The helical teeth 104 are protruded in the outer side of the gear ring 101 in the radial direction, with one end connected to the gear disk 103 in the axial direction and the other end flush with the end of the gear ring 101 away from the gear disk 103. The reinforcing ribs 105 are protruded in the outer side of the gear ring 101 in the radial direction, located between adjacent teeth, and one end is connected to the gear disk 103.

[0035] In the rearview mirror folding device, the drive gear 1 is connected to the drive motor installed in the housing 4 through the helical tooth 104, thereby driving the housing 4 of the rearview mirror folding device to rotate around the drive gear 1 to realize the folding or unfolding action. The first limiting groove 102 is used to cooperate with the gear seat 3 to realize the locking and releasing of the housing 4.

[0036] Specifically, refer to Figure 3 The drive gear 1 is connected to the drive motor via the transmission mechanism 5. Both the transmission mechanism 5 and the drive motor are mounted on the housing 4. The transmission mechanism 5 includes a worm gear that meshes directly with the drive gear 1. The drive motor drives the worm gear to rotate relative to the drive gear 1. Thus, when the drive gear 1 is in the locked state, the housing 4 rotates around the drive gear 1.

[0037] On the one hand, by using the gear plate 103 located at the same end of the first limiting groove 102, the radial dimension loss caused by the setting of the first limiting groove 102 can be compensated, thereby improving the structural strength while avoiding increasing the radial dimension of the drive gear 1; on the other hand, by further adding reinforcing ribs 105, the radial dimension loss caused by the setting of the first limiting groove 102 can be further compensated while ensuring that the meshing transmission function of the helical teeth 104 is not affected, thereby improving the structural strength.

[0038] Therefore, the drive gear 1 can balance structural strength and radial dimensions, meeting the requirements of the rearview mirror folding device for structural strength and miniaturization.

[0039] Optionally, in some embodiments, the drive gear 1 is a powder metallurgy gear. By using powder metallurgy to manufacture the drive gear 1, it is helpful to further improve the structural strength of the drive gear 1, thereby meeting the requirements for bearing torque load while maintaining miniaturization; the reinforcing rib 105 plays the role of increasing the wall thickness, thus also reducing defects at the intersection of the gear disc 103 and the helical tooth 104, and improving the manufacturing quality of powder metallurgy.

[0040] Specifically, in some embodiments, the minimum wall thickness of the drive gear 1 is greater than or equal to 0.6 mm and less than or equal to 1 mm.

[0041] Understandably, referring to Figure 6 and Figure 7 The surface of the first limiting groove 102 needs to be in contact with the gear seat 3 of the rearview mirror folding device to transmit torque. In order to avoid excessive local pressure, the radial dimension of the first limiting groove 102 cannot be too small.

[0042] Reference Figure 2 The minimum wall thickness of the drive gear 1 is the minimum distance between the surface of the reinforcing rib 105 and the surface of the first limiting groove 102. By limiting the minimum wall thickness, it helps to reduce process defects that occur during powder metallurgy, improve the manufacturing quality of powder metallurgy, and meet the requirements of structural strength. By limiting the maximum minimum wall thickness, it helps to reduce the radial dimension of the gear ring 101 and increase the proportion of the radial dimension of the first limiting groove 102 in the radial dimension of the gear ring 101 (that is, to make fuller use of the radial dimension of the gear ring 101), thus avoiding the radial dimension of the drive gear 1 from being too large.

[0043] In some embodiments, the outer diameter of the reinforcing rib 105 gradually decreases from one end of the connecting toothed disc 103 to the other end. (Refer to...) Figure 3 Since the drive gear 1 is connected to the worm gear transmission, by using the inclined reinforcing rib 105 with a gradually decreasing outer diameter, the axial dimension of the reinforcing rib 105 can be increased as much as possible while avoiding the worm gear, thereby improving the structural strength of the drive gear 1 while ensuring that the meshing transmission function of the helical teeth 104 is not affected.

[0044] In some embodiments, refer to Figure 4 and Figure 5 The axial dimension of the reinforcing rib 105 is A, the axial dimension of the gear disk 103 is B, the maximum axial depth of the first limiting groove 102 is C1, and the drive gear 1 satisfies A+B>C1.

[0045] Furthermore, in some embodiments, the minimum axial depth of the first limiting groove 102 is C2, and the drive gear 1 satisfies B≤C2.

[0046] Understandably, under the action of external force, the gear seat 3 and the drive gear 1 abut together axially. In order to lock and unlock with the gear seat 3, the bottom of the first limiting groove 102 is uneven in the axial direction, thus having a first peak surface and a first valley surface. The depth of the first peak surface is the minimum axial depth C2, and the depth of the first valley surface is the maximum axial depth C1. The gear seat 3 correspondingly has first limiting teeth 301 distributed circumferentially. When the first limiting teeth 301 abut against the first peak surface, the drive gear 1 is unlocked and can rotate relative to the gear seat 3. When the first limiting teeth 301 are inserted below the first peak surface, the drive gear 1 is locked relative to the gear seat 3.

[0047] The first limiting groove 102 can be divided into two parts in the axial direction with the first peak surface as the boundary. Above the first peak surface, the first limiting groove 102 is continuous in the circumferential direction, and its weakening effect on structural strength is relatively strong. Below the first peak surface, the first limiting groove 102 is discontinuous in the circumferential direction, and its weakening effect on structural strength is relatively weak.

[0048] On the one hand, by setting A+B≥C1, it can be ensured that the gear plate 103 and the reinforcing rib 105 cover the first limiting groove 102 in the axial direction, reliably increasing the wall thickness of the drive gear 1.

[0049] On the other hand, by setting B≤C2, the shape characteristics of the first limiting groove 102 can be taken into account. The toothed disc 103 with a relatively good reinforcement effect can be used to compensate for the weakening of the structural strength of the part of the first limiting groove 102 above the first peak surface, and the reinforcing rib 105 with a relatively weak reinforcement effect can be used to compensate for the weakening of the structural strength of the part of the first limiting groove 102 below the first peak surface. While ensuring the compensation effect, the axial dimension of the toothed disc 103 is not too large, which helps to reduce the weight of the drive gear 1 while meeting the structural strength requirements, and achieve lightweight design.

[0050] In some embodiments, the drive gear 1 further includes a limiting block 106, which protrudes radially from the inner side of the gear ring 101 and is offset from the first limiting groove 102. The two ends of the limiting block 106 in the axial direction are flush with the two ends of the gear ring 101.

[0051] In the rearview mirror folding mechanism, the limiting block 106 is used to limit the rotation range of the drive gear 1 on the gear seat 3. By making the two ends of the limiting block 106 and the gear ring 101 flush, the axial dimension of the limiting block 106 can be increased, which helps to reduce the radial dimension of the limiting block 106 while maintaining structural strength, thus achieving a lightweight design.

[0052] According to an embodiment of this application, on the other hand, referring to... Figure 6 and Figure 7 The application also provides a rearview mirror folding device, including a mounting base 2, a gear seat 3, a rotating assembly, and a drive gear 1 provided in this application. The mounting base 2 includes a seat body 201 and a rotating shaft 202 with one end disposed on the seat body 201. The seat body 201 is adapted to be mounted on a vehicle body. The gear seat 3 is sleeved on the outside of the rotating shaft 202 and one end abuts against the seat body 201. The drive gear 1 is sleeved on the outside of the gear seat 3. The rotating assembly includes a housing 4, a transmission mechanism 5, and a drive motor (not shown in the figure). The housing 4 is sleeved on the outside of the rotating shaft 202 and is adapted to mount a rearview mirror. The drive motor is disposed on the housing 4 and is connected to the drive gear 1 through the transmission mechanism 5. The drive motor can drive the rotating assembly to rotate around the drive gear 1.

[0053] The rearview mirror folding device includes the drive gear 1 provided in this application, and therefore has the beneficial effects brought by the drive gear 1, which will not be described in detail here.

[0054] In some embodiments, the housing 4 forms a transmission chamber, the drive gear 1 and the gear seat 3 are located in the transmission chamber, the end of the drive gear 1 away from the gear disk 103 abuts against the housing 4, the gear seat 3 includes a first limiting tooth 301, the first limiting tooth 301 protrudes radially from the outside of the gear seat 3 and is adapted to abut against a first limiting groove 102, the first limiting groove 102 can move closer to or away from the first limiting tooth 301 in the axial direction to lock or release the housing 4.

[0055] Specifically, in some embodiments, the housing 4 may include a first housing 401 and a second housing 402, which are arranged axially opposite to each other. A transmission chamber is formed between the first housing 401 and the second housing 402, and the transmission mechanism 5, the drive gear 1, and the gear seat 3 are located within the transmission chamber. The housing 4 may also include a third housing 403, which is arranged axially opposite to the second housing 402 and located on the side of the second housing 402 opposite to the first housing 401. A drive chamber is formed between the third housing 403 and the second housing 402, and the drive motor is located within the drive chamber. Separating the drive motor within the drive chamber helps improve the waterproofing effect and safety of the rearview mirror folding device.

[0056] Understandably, referring to Figure 7 and Figure 8 The housing 4 (specifically the first housing 401 in the illustrated embodiment) includes a second limiting groove, which is recessed in the axial direction at one end of the housing 4 facing the seat 201 and has a second peak surface and a second valley surface. The seat 201 includes a second limiting tooth, which is protruded in the axial direction at one end of the seat 201 facing the housing 4 and is suitable for insertion into the second limiting groove.

[0057] The first limiting tooth 301, the first limiting groove 102, the second limiting tooth, and the second limiting groove cooperate with each other, so that the drive gear 1 and the housing 4 cannot be in the unlocked state at the same time.

[0058] Specifically, when the first limiting tooth 301 abuts against the first peak surface, the drive gear 1 is in an unlocked state away from the gear seat 3 in the axial direction, and presses the housing 4 against the seat 201, so that the second limiting tooth is inserted under the second peak surface, pressing and locking the housing 4 to the seat 201 to prevent the housing 4 from rotating accidentally; when the first limiting tooth 301 is inserted under the first peak surface, the drive gear 1 moves in the axial direction away from the seat 201, so that it is in a locked state close to the gear seat 3 in the axial direction, freeing up axial movement space for the housing 4, so that the second limiting tooth can rise above the second peak surface, unlock, and rotate under the action of the drive motor.

[0059] Reference Figure 8 and Figure 9 In some embodiments, the drive gear 1 includes a first protrusion 107 that protrudes axially from one end of the gear ring 101 away from the gear disk 103 and is spaced apart in the circumferential direction. The housing 4 includes a second protrusion 4011 that protrudes axially from the side of the housing 4 facing the drive gear 1 and is spaced apart in the circumferential direction. The second protrusion 4011 is adapted to abut against the first protrusion 107.

[0060] It is understandable that the force that causes the drive gear 1 to move axially comes from the axial component force generated when the worm and the helical tooth 104 mesh. Specifically, the limiting block 106 is inserted radially into the gear seat 3, and the drive gear 1 can rotate relative to the gear seat 3 within the range defined by the limiting block 106. When the drive motor is running, the drive gear 1 first rotates under the action of the worm until the drive gear 1 rotates to the limit position (that is, the limiting block 106 and the gear seat 3 abut). Then, under the action of the worm, the drive gear 1 overcomes the elastic force applied by the spring and moves away from the seat 201 until the drive gear 1 moves to the limit position axially (that is, the first limiting tooth 301 is inserted below the first peak surface). After that, the reaction force of the axial component force acts on the worm, causing the housing 4 to move away from the gear plate 103, and the second limiting tooth rises above the second peak surface, releasing the lock of the housing 4.

[0061] During this process, when the drive gear 1 moves axially away from the seat 201, the worm moves axially away from the gear disk 103 relative to the drive gear 1, causing the meshing part of the worm and the helical tooth 104 to gradually shift from the middle of the drive gear 1 to the edge of the drive gear 1; when the housing 4 moves away from the gear disk 103, the meshing part of the worm and the helical tooth 104 returns to the middle of the drive gear 1.

[0062] During this process, if the meshing part is too close to the edge, it can easily lead to unreasonable force on the drive gear 1, affecting the service life of the drive gear 1.

[0063] By setting the second protrusion 4011 and the first protrusion 107, when the housing 4 is in the locked state, the second protrusion 4011 and the first protrusion 107 abut against each other, leaving a certain space between the housing 4 and the drive gear 1. As the drive gear 1 rotates under the action of the worm, the second protrusion 4011 and the first protrusion 107 are misaligned. Under the action of axial pressure, the drive gear 1 moves towards the gear disk 103, which in turn causes the worm to move towards the gear disk 103, leaving space for the subsequent movement of the worm away from the gear disk 103. This helps to prevent the meshing part of the worm and the helical tooth 104 from being too close to the edge, improves the transmission effect, and extends the service life of the drive gear 1.

[0064] Additionally, it should be noted that, as Figure 3 As shown in the embodiments of this application, a gear 103 and a reinforcing rib 105 are provided only at one end where the first limiting groove 102 is located, while the other ends of the helical teeth 104 and the gear ring 101 are flush, which helps to avoid the worm moving away from the gear 103 and reduce the axial size of the drive gear 1.

[0065] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A drive gear, characterized in that, include: Gear ring (101); The first limiting groove (102) is recessed in the inner side of the gear ring (101) in the radial direction and located at one end of the gear ring (101) in the axial direction; The gear disc (103) protrudes radially from the outside of the gear ring (101) and is located at the same end of the gear ring (101) in the axial direction as the first limiting groove (102); The helical tooth (104) protrudes radially from the outside of the gear ring (101), with one end connected to the gear disk (103) in the axial direction, and the other end flush with the end of the gear ring (101) away from the gear disk (103). A reinforcing rib (105) is provided on the outer side of the toothed ring (101) along the radial direction. The reinforcing rib (105) is located between adjacent teeth and one end is connected to the toothed disc (103).

2. The drive gear according to claim 1, characterized in that, The drive gear (1) is a powder metallurgy gear.

3. The drive gear according to claim 2, characterized in that, The minimum wall thickness of the drive gear (1) is greater than or equal to 0.6 mm and less than or equal to 1 mm.

4. The drive gear according to any one of claims 1 to 3, characterized in that, The outer diameter of the reinforcing rib (105) gradually decreases from one end connected to the toothed disc (103) to the other end.

5. The drive gear according to claim 4, characterized in that, The axial dimension of the reinforcing rib (105) is A, the axial dimension of the gear disc (103) is B, the maximum depth of the first limiting groove (102) is C1, and the driving gear (1) satisfies A+B≥C1.

6. The drive gear according to claim 5, characterized in that, The minimum axial depth of the first limiting groove (102) is C2, and the driving gear (1) satisfies B≤C2.

7. The drive gear according to claim 1, characterized in that, It also includes a limiting block (106), which protrudes radially from the inner side of the gear ring (101) and is offset from the first limiting groove (102). The two ends of the limiting block (106) in the axial direction are flush with the two ends of the gear ring (101).

8. A rearview mirror folding device, characterized in that, include: Mounting base (2) includes a base body (201) and a pivot (202) with one end disposed on the base body (201), the base body (201) being adapted to be mounted on a vehicle body; The gear seat (3) is sleeved on the outside of the rotating shaft (202) and one end abuts against the seat body (201). The drive gear (1) according to any one of claims 1 to 7 is sleeved on the outside of the gear seat (3); The rotating assembly includes a housing (4), a transmission mechanism (5), and a drive motor. The housing (4) is sleeved on the outside of the rotating shaft (202) and is suitable for mounting a rearview mirror. The drive motor is disposed on the housing (4) and is connected to the drive gear (1) through the transmission mechanism (5). The drive motor can drive the rotating assembly to rotate around the drive gear (1).

9. The rearview mirror folding device according to claim 8, characterized in that, The housing (4) forms a transmission chamber, the drive gear (1) and the gear seat (3) are located in the transmission chamber, and the end of the drive gear (1) away from the gear disk (103) abuts against the housing (4). The gear seat (3) includes a first limiting tooth (301) which protrudes radially from the outside of the gear seat (3) and is adapted to abut against the first limiting groove (102). The first limiting groove (102) can move closer to or further away from the first limiting tooth (301) along the axial direction to lock or release the housing (4).

10. The rearview mirror folding device according to claim 9, characterized in that, The drive gear (1) includes a first protrusion (107) which protrudes axially from one end of the gear ring (101) away from the gear disk (103) and is spaced apart in the circumferential direction. The housing (4) includes a second protrusion (4011) which protrudes axially from one side of the housing (4) facing the drive gear (1) and is spaced apart in the circumferential direction. The second protrusion (4011) is adapted to abut against the first protrusion (107).

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