A motor axial gap control mechanism

Abstract

The utility model discloses a motor axial gap control mechanism, it includes the limiting part in the motor output shaft end part, the limiting part with the end part is engaged and carries out the limiting to the axial position of output shaft, its characterized in that, the limiting part is self -locking on the resistance surface.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor axial clearance control mechanism. Background Technology

[0002] In existing technologies, axial clearance in the output shaft of a motor can cause problems such as motor slippage and reduced efficiency. To solve this problem, an elastic component is usually added to the end of the output shaft to apply a certain axial pressure to the motor shaft, thereby eliminating the axial clearance. Chinese Utility Model Announcement No. CN216599281U discloses a linear adjustment mechanism and its axial clearance control device, which sets an elastic pad and a hard pad at the end of the output shaft. By changing the hardness of the elastic pad, its deformation is controlled, thereby achieving the purpose of eliminating axial clearance. In reality, because the axial force and slippage clearance of different motors vary greatly, a single type of elastic pad cannot be well adapted to various motor models. Therefore, different elastic pads are needed to provide different levels of counter-pressure. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the purpose of this utility model is to provide a motor axial clearance control mechanism to adapt to various types of motors.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An axial clearance control mechanism for a motor includes a limiting component located at the end of the motor output shaft. The limiting component engages with the end to limit the axial position of the output shaft, and the limiting component is self-locked to a resistance surface.

[0006] Furthermore, the resistance surface is an inclined plane, and the self-locking is achieved by the static friction force on the limiting component and the axial force on the output shaft canceling each other out.

[0007] Furthermore, it also includes an inclined groove disposed within the housing, with the end extending into the inclined groove from one side and connecting with the limiting component, the resistance surface being a side of the inclined groove away from the end, and the limiting component being suspended within the inclined groove.

[0008] Furthermore, the limiting component includes contact surfaces located on opposite sides and in contact with the resistance surface to perform self-locking, and a limiting surface that engages with the end to perform limiting, wherein the extending direction of the limiting surface is in the same direction as the direction of gravity.

[0009] Furthermore, the extending direction of the limiting surface is perpendicular to the extending direction of the transmission shaft axis.

[0010] Furthermore, the limiting component is wedge-shaped.

[0011] Furthermore, it also includes a retaining member placed on one side of the limiting member. When the limiting member moves along the resistance surface due to axial force, the retaining member and the limiting member press against each other, so that the limiting member continues to engage with the output shaft to perform the limiting.

[0012] Furthermore, the retaining component is fixed within the receiving groove of the cover.

[0013] Furthermore, the interaction force between the retaining component and the limiting component is parallel to the direction of gravity.

[0014] Furthermore, the retaining component is made of elastic rubber.

[0015] The beneficial effects of this utility model are as follows:

[0016] The present invention provides a motor axial clearance control mechanism, which changes the sliding threshold of the limiting component by setting the limiting component on the resistance surface, so that the control mechanism can adapt to more types of motors. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 It is an exploded view of the motor and its transmission control mechanism.

[0019] Figure 2 This is a cross-sectional view of the control mechanism of this utility model (excluding the limiting and retaining components).

[0020] Figure 3 This is a cross-sectional view of the control mechanism of this utility model.

[0021] Figure 4 This is a schematic diagram of one embodiment of the present invention. Detailed Implementation

[0022] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. The above description is for the purpose of simplifying the description of this utility model and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0023] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0024] When a component is described in the specification as being "on", "fixed" to, "connected" to, or "joined" to another component, the component may be directly located on, fixed to, connected to, joined to, or in contact with the other component, or there may be an intermediate component present.

[0025] Exemplary embodiments of this application will now be described with reference to the accompanying drawings. However, it should be understood that this application can be presented in many different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments. Throughout the drawings, the same reference numerals denote the same or functionally identical elements.

[0026] refer to Figure 1 The driving force output by the motor 10 is torque-modified by the gearbox and then transmitted to external parts through the transmission rod 20. The gearbox includes an output gear 11 that rotates with the output shaft 12 of the motor 10, a housing 30 that forms the outer shell of the gearbox, and a cover 40. In order to suppress the axial movement of the output shaft 12, a limiting component 50 is also provided in the gearbox to axially limit the output shaft 12.

[0027] refer to Figure 2 and Figure 3 When assembling the motor 10 and the gearbox, the output shaft 12 of the motor 10 is inserted into the housing 30 and held in place by the housing 30. A groove 31 is formed in the housing 30 on the side opposite to the side where the motor 10 is assembled. The end 12a of the output shaft 12 inserted into the housing 30 passes through the groove 31 from one side. The side of the groove 31 opposite to the side where the motor 10 is assembled (i.e., the side away from the end 12a) is a resistance surface 32 that serves as an incline. The resistance surface 32 is configured such that the angle θ between its extending direction and the direction of gravity is less than 90° (e.g., 1° to 89°), and it gradually moves away from the side of the motor 10 as it moves upward from the bottom 33 of the groove.

[0028] The limiting component 50 is placed in the inclined groove 31. The limiting component 50 is a plastic part, and one side of it is a contact surface 51 that contacts the resistance surface 32 of the inclined groove 31. The contact surface 51 and the resistance surface 32 are inclined relative to the direction of gravity. When the motor 10 is assembled with the gearbox, the other side of the limiting component 50 is a limiting surface 52, which contacts the end 12a of the output shaft 12 to limit the axial position of the output shaft 12 and keep it within the design range.

[0029] The limiting component 50 achieves self-locking stillness within the inclined groove 31 through the static friction force acting on the limiting component 50, the axial force from the output shaft 12, and the normal pressure from the contact surface 51, thus suspending the limiting component 50 in the inclined groove 31 without touching the bottom 33 of the inclined groove. The static friction force acting on the limiting component 50 specifically includes the static friction force between the contact surface 51 and the resistance surface 32, and the static friction force between the limiting surface 12 and the end 12a of the output shaft 12.

[0030] In one embodiment, the angle θ between the extension direction of the resistance surface 32 and the contact surface 51 and the direction of gravity is preferably set to the range of 15° to 17°, more preferably, the angle θ = 16°. This ensures that the weight of the limiting member 50 itself, the static friction between the contact surface 51 and the resistance surface 32, and the positive pressure on the contact surface 51 from the resistance surface 32 are properly balanced, thereby reliably ensuring the self-locking of the limiting member 50.

[0031] In one embodiment, the extending direction of the limiting surface 52 is parallel to the direction of gravity G and perpendicular to the axial direction of the output shaft 12.

[0032] In this embodiment, the limiting member 50 is wedge-shaped, but it is not limited to this. The limiting member 50 may also be triangular or other shapes with inclined surfaces that match the resistance surface 32.

[0033] In related technologies, the axial force and clearance of the output shaft of different motor models vary significantly. Even motors of the same model may have different axial clearances on their output shafts due to manufacturing tolerances. In such cases, if a single type of elastic pad is used at the end of the motor's output shaft to accommodate different motor output shafts, the elastic pad may sometimes apply a large preload, which could cause wear at the end of the motor's output shaft and fail to adequately eliminate the axial clearance.

[0034] In contrast, in the motor axial clearance control mechanism of this embodiment, instead of providing an elastic pad, the limiting member is placed on the resistance surface. By changing the positional relationship between the limiting member and the resistance surface (i.e., changing the sliding threshold of the limiting member), the distance between the limiting member and the output shaft in the axial direction of the motor is changed. As a result, the control mechanism can reliably eliminate axial clearance for different types of motors without causing damage to the output shaft of the motor.

[0035] In one embodiment, the gearbox is further provided with a retaining member 60 to further assist the limiting member 50 in maintaining its position. For example... Figure 3 As shown, the retaining member 60 is disposed above the limiting member 50. The retaining member 60 is elastically deformable. Since the motor 10 may generate a large instantaneous axial force during startup / stall, this axial force will push the limiting member 50 upward along the resistance surface 32. Therefore, the elastic deformation characteristic of the retaining member 60 provides a reverse force F to the limiting member 50. Preferably, the interaction force between the retaining member 60 and the limiting member 50 is parallel to the direction of gravity.

[0036] When the axial force generated by the motor 10 is small, the limiting component 50 remains self-locking and stationary by the mutual cancellation of the static friction force it experiences, the axial force from the output shaft 12, the normal pressure from the contact surface 51 (and the weight of the limiting component 50 itself). When the axial force is large, the limiting component 50 tends to move upward along the resistance surface 32 under the action of the axial force. The elastic properties of the holding component 60 press the limiting component 50 from above to keep the limiting component 50 stationary, thereby limiting the axial movement of the output shaft 12.

[0037] In one embodiment, the retaining member 60 is fixed in a receiving groove 41 in the cover 40 of the housing 30, which is opposite to the inclined groove when viewed from above, thereby placing the retaining member 60 on the upper side of the limiting member 50.

[0038] Reference Figure 4 In another embodiment, the retaining component 60 is integrally integrated into the housing cover 40.

Claims

1. A motor axial clearance control mechanism, characterized in that, The device includes a housing configured to hold the output shaft of a motor and a limiting member disposed within the housing and positioned adjacent to an end of the output shaft of the motor, such that engagement of the limiting member with the end cap limits the axial position of the output shaft. The housing has a resistance surface on the side opposite to the motor inside. The limiting component includes a contact surface that fits against the resistance surface. Both the resistance surface and the contact surface are inclined surfaces. The limiting component is configured to self-lock onto the resistance surface by the static friction force acting on the limiting component, the axial force of the output shaft, and the positive pressure from the resistance surface.

2. The motor axial clearance control mechanism as described in claim 1, characterized in that, An inclined groove with the resistance surface is provided inside the housing. The limiting member is placed in the inclined groove. The end extends from one side of the housing into the inclined groove and connects with the limiting member. The resistance surface is the side of the inclined groove away from the end.

3. The motor axial clearance control mechanism as described in claim 2, characterized in that, The limiting component is suspended inside the inclined groove without contacting the bottom of the inclined groove.

4. The motor axial clearance control mechanism as described in claim 3, characterized in that, The resistance surface and the contact surface are configured such that the angle between their respective extending directions and the direction of gravity is less than 90°, and they gradually move away from the motor side as they move upward from the bottom of the inclined groove.

5. The motor axial clearance control mechanism as described in claim 4, characterized in that, The included angle is 15°~17°.

6. The motor axial clearance control mechanism as described in claim 1, characterized in that, The limiting component further includes a limiting surface that is opposite to the contact surface and engages with the end to implement the limiting, wherein the extending direction of the limiting surface is in the same direction as the direction of gravity.

7. The motor axial clearance control mechanism as described in claim 6, characterized in that, The static friction force experienced by the limiting component includes the static friction force between the contact surface and the resistance surface, and the static friction force between the limiting surface and the end of the output shaft.

8. The motor axial clearance control mechanism as described in claim 6, characterized in that, The extending direction of the limiting surface is perpendicular to the extending direction of the axis of the output shaft.

9. The motor axial clearance control mechanism as described in claim 1, characterized in that, The limiting component is wedge-shaped or triangular.

10. The motor axial clearance control mechanism as described in any one of claims 1 to 9, characterized in that, It also includes a retaining member positioned above the limiting member. When the limiting member moves along the resistance surface due to an axial force from the output shaft, the retaining member and the limiting member press against each other to keep the limiting member engaged with the output shaft to perform the limiting action.

11. The motor axial clearance control mechanism as described in claim 10, characterized in that, The retaining member is fixed in a receiving groove provided in the cover of the housing, or the retaining member is integrally integrated into the cover.

12. The motor axial clearance control mechanism as described in claim 10, characterized in that, The interaction force between the retaining component and the limiting component is parallel to the direction of gravity.

13. The motor axial clearance control mechanism as described in claim 10, characterized in that, The limiting component is made of plastic, and the retaining component is made of elastic rubber.

14. The motor axial clearance control mechanism as described in any one of claims 1 to 9, characterized in that, The driving force output by the motor is transmitted to external parts after being variably converted by the gearbox. The gearbox includes an output gear that rotates with the output shaft of the motor and the housing.

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