A limiting ring for a middle motor

Abstract

The utility model discloses a kind of limit ring for mid-position motor, including with the interference fit of motor box body inner wall limit ring, the inner wall of limit ring has locating convex strip, limit ring is equipped in the end of torque sensor and is concentric with torque sensor, the end of locating convex strip and torque sensor is directly opposite, there is play clearance between the end of locating convex strip and torque sensor.In torque overload time, limit ring, locating convex strip can be contacted with torque sensor shell and form rigid block, avoid sensitive element such as elastic beam, strain gauge in torque sensor due to excessive deformation and damage;Limit ring is concentric with torque sensor, can reduce the deviation when torque sensor is installed, improve accuracy, can also disperse load stress, reduce the fatigue risk of sensitive element such as elastic beam, strain gauge in torque sensor under high-frequency dynamic load, prolong the service life of torque sensor.

Description

Technical Field

[0001] This utility model relates to the technical field of motors, and in particular to a limiting ring for a mid-drive motor. Background Technology

[0002] Mid-drive motors often contain torque sensors. By working with PLCs, PCs, and other systems, the operating status of the motor can be monitored. However, when the external load on the torque sensor is too large, the internal elastic body or strain gauge may undergo irreversible deformation. This requires frequent adjustment and replacement of the torque sensor, which can affect the operation of the mid-drive motor. Therefore, improvements are needed. Summary of the Invention

[0003] This invention addresses the shortcomings of existing torque sensors, such as irreversible deformation of the elastic body or strain gauge due to excessive external load, requiring frequent replacement of the torque sensor and thus affecting the use of the mid-drive motor. It provides a new type of limiting ring for mid-drive motors.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0005] A limiting ring for a mid-drive motor includes a limiting ring that is interference-fitted with the inner wall of the motor housing. The inner wall of the limiting ring has a positioning protrusion. The limiting ring is sleeved on the end of a torque sensor and is concentrically arranged with the torque sensor. The positioning protrusion is directly opposite the end of the torque sensor, and there is a movable gap between the positioning protrusion and the end of the torque sensor.

[0006] The limiting ring sets the mechanical displacement limit of the sensor. When the torque is overloaded, the limiting ring and positioning protrusion will contact the torque sensor housing and form a rigid barrier, preventing damage to sensitive elements such as elastic beams and strain gauges inside the torque sensor due to excessive deformation. The limiting ring is concentrically set with the torque sensor, which can reduce the deviation during installation of the torque sensor, improve accuracy, and at the same time distribute load stress, reducing the fatigue risk of sensitive elements such as elastic beams and strain gauges inside the torque sensor under high-frequency dynamic loads, and extending the service life of the torque sensor, thus eliminating the need for frequent replacement and maintenance of the torque sensor.

[0007] Preferably, in the aforementioned limiting ring for a mid-mounted motor, the inner wall of the limiting ring is provided with a guide groove, which extends along the height direction of the limiting ring and is used for the insertion and sliding of the limiting post on the torque sensor.

[0008] The guide groove and the limiting post are connected to guide and position the torque sensor and the limiting ring during assembly. This allows the limiting ring to be placed in the corresponding position, preventing the limiting ring from rotating synchronously with the central shaft. This ensures that the torque sensor and the limiting ring maintain a good degree of concentricity, improves the stability of the torque sensor moving towards or away from the positioning protrusion, and further enhances the limiting effect of the limiting ring on the torque sensor.

[0009] Preferably, in the aforementioned limiting ring for a mid-mounted motor, the number of guide grooves is multiple, and the guide grooves are symmetrically distributed on the inner wall of the limiting ring.

[0010] Multiple guide grooves further improve the stability of the torque sensor moving on the limit ring.

[0011] Preferably, the limiting ring for a mid-mounted motor described above includes a ring body and a plurality of extension plates disposed at the lower end face of the ring body. The extension plates extend along the height direction of the ring body, the upper part of the guide groove is distributed on the inner wall of the ring body, and the lower part of the guide groove is distributed on the inner wall of the extension plate.

[0012] The length of the guide groove can be increased by extending the plate. While ensuring that the limiting ring plays a limiting role on the torque sensor, the contact area between the limiting ring and the torque sensor is reduced, thereby reducing the frictional force that causes the torque sensor to move closer to or away from the positioning protrusion.

[0013] Preferably, in the aforementioned limiting ring for a mid-mounted motor, the positioning protrusions are coaxially arranged with the limiting ring and are distributed on the outside of the guide groove.

[0014] The positioning protrusion and the limiting ring are coaxially arranged, which increases the contact area of ​​the positioning protrusion when restricting the movement of the torque sensor, and further enhances the limiting effect of the limiting ring on the torque sensor.

[0015] Preferably, in the aforementioned limiting ring for a mid-mounted motor, the inner wall of the limiting ring protrudes outward to form a support platform, and the upper surface of the support platform has a through hole for threading.

[0016] The wire hole facilitates the routing of the torque sensor's wiring harness to the outside of the motor housing, while the support platform provides support for the wiring harness, improving the neatness of the wiring. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0019] Figure 3This is a schematic diagram showing the installation relationship between the limiting ring and the torque sensor of this utility model;

[0020] Figure 4 This is a cross-sectional view showing the installation relationship between the limiting ring and the torque sensor of this utility model.

[0021] Figure 5 This is a partial sectional view showing the installation relationship between the limiting ring, the motor housing, and the torque sensor of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Limiting ring; 11. Ring body; 12. Extension plate; 2. Positioning protrusion; 3. Movement gap; 4. Guide groove; 5. Support platform; 51. Threading hole. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1-5 The present invention will be further described in detail with reference to specific embodiments, but these are not intended to limit the present invention: Example

[0024] like Figures 1-5 As shown, a limiting ring for a mid-drive motor includes a limiting ring 1 that is interference-fitted with the inner wall of the motor housing. The inner wall of the limiting ring 1 has a positioning protrusion 2. The limiting ring 1 is sleeved on the end of a torque sensor and is concentrically arranged with the torque sensor. The positioning protrusion 2 is directly opposite the end of the torque sensor, and there is a movable gap 3 between the positioning protrusion 2 and the end of the torque sensor.

[0025] Preferably, the inner wall of the limiting ring 1 is provided with a guide groove 4, which extends along the height direction of the limiting ring 1. The guide groove 4 is used for the insertion and sliding of the limiting post on the torque sensor.

[0026] Preferably, there are multiple guide grooves 4, which are symmetrically distributed on the inner wall of the limiting ring 1.

[0027] Preferably, the limiting ring 1 includes a ring body 11 and a plurality of extension plates 12 disposed at the lower end face of the ring body 11. The extension plates 12 extend along the height direction of the ring body 11. The upper part of the guide groove 4 is distributed on the inner wall of the ring body 11, and the lower part of the guide groove 4 is distributed on the inner wall of the extension plates 12.

[0028] Preferably, the positioning protrusion 2 is coaxially arranged with the limiting ring 1, and the positioning protrusion 2 is distributed on the outside of the guide groove 4.

[0029] Preferably, the inner wall of the limiting ring 1 protrudes outward to form a support platform 5, and the upper surface of the support platform 5 has a through hole 51.

[0030] Specifically, in the embodiments of this application, such as Figure 1 , Figure 2 As shown, there are two guide grooves 4. The inner radial direction of the guide groove 4 away from the ring 11 gradually decreases towards the ring 11. This allows it to make way when the limiting post on the torque sensor is inserted into the guide groove 4, making it easier to assemble the limiting ring 1 with the torque sensor.

[0031] The limiting ring 1 can set the mechanical displacement limit of the torque sensor. When the torque is overloaded, the limiting ring 1 and the positioning protrusion 2 will contact the housing of the torque sensor and form a rigid barrier to prevent the sensitive elements inside the torque sensor, such as elastic beams and strain gauges, from being damaged due to excessive deformation. At the same time, the limiting ring 1 is concentrically set with the torque sensor, which helps the limiting ring 1 to distribute the load stress, reduce the fatigue risk of sensitive elements such as elastic beams and strain gauges under high-frequency dynamic loads, and extend the service life of the torque sensor, thus eliminating the need for frequent disassembly and maintenance of the torque sensor.

[0032] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A limiting ring for a mid-drive motor, characterized in that: It includes a limiting ring (1) that is interference-fitted with the inner wall of the motor housing. The inner wall of the limiting ring (1) has a positioning protrusion (2). The limiting ring (1) is sleeved on the end of the torque sensor and is concentrically arranged with the torque sensor. The positioning protrusion (2) is directly opposite the end of the torque sensor. There is a movable gap (3) between the positioning protrusion (2) and the end of the torque sensor.

2. The limiting ring for a mid-drive motor according to claim 1, characterized in that: The inner wall of the limiting ring (1) is provided with a guide groove (4), which extends along the height direction of the limiting ring (1) and is used to engage with the limiting post on the torque sensor.

3. A limiting ring for a mid-drive motor according to claim 2, characterized in that: The guide grooves (4) are provided in multiple quantities and are symmetrically distributed on the inner wall of the limiting ring (1).

4. A limiting ring for a mid-drive motor according to claim 3, characterized in that: The limiting ring (1) includes a ring body (11) and a plurality of extension plates (12) disposed at the lower end face of the ring body (11). The extension plates (12) extend along the height direction of the ring body (11). The upper part of the guide groove (4) is distributed on the inner wall of the ring body (11), and the lower part of the guide groove (4) is distributed on the inner wall of the extension plate (12).

5. A limiting ring for a mid-drive motor according to claim 2, characterized in that: The positioning protrusion (2) is coaxially arranged with the limiting ring (1), and the positioning protrusion (2) is distributed on the outside of the guide groove (4).

6. A limiting ring for a mid-drive motor according to claim 1, characterized in that: The inner wall of the limiting ring (1) protrudes outward to form a support platform (5), and the upper surface of the support platform (5) has a through hole (51).

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