Structure for placing torque sensor on split crankshaft of centrally-mounted motor

Abstract

The utility model discloses a structure for placing a torque sensor on a split crankshaft of a centrally-mounted motor. The structure comprises a centrally-mounted motor left crankshaft, a torque sensor controller, a torque sensor elastic body, a clutch support, a centrally-mounted motor right crankshaft and screws. According to the utility model, the torque sensor structure is separately arranged on the centrally-mounted motor crankshaft, and the torque sensor is arranged between the centrally-mounted motor left crankshaft and the centrally-mounted motor right crankshaft, so that the radial space for placing the torque sensor is saved.

Description

Technical Field

[0001] This utility model relates to the field of torque sensor technology, specifically to a structure for placing a torque sensor on a split crankshaft of a mid-mounted motor. Background Technology

[0002] A mid-drive motor torque sensor is installed between the bottom bracket and the output shaft of an e-bike to measure the transmitted torque. It uses strain gauges to detect minute deformations on the bottom bracket surface, thus obtaining the torque value. The sensor boasts high measurement accuracy and can quickly and accurately measure and transmit torque data to the motor controller in different riding modes, such as manual or electric assist, to control the motor's output of appropriate power. The accuracy of the torque sensor is crucial for providing a smooth and natural riding experience, avoiding the discomfort caused by inaccurate measurements from traditional pedal sensors.

[0003] Traditionally, the torque sensor for a mid-drive motor is mounted on the motor housing, with the rotating part of the sensor fixed to the motor's central shaft. Currently, the existing method is to place it directly on a machined crankshaft, but the overall radial dimension exceeds 40mm, posing a significant challenge to the current design requirements for miniaturizing motors.

[0004] Therefore, it is of great significance to provide a structure for placing a torque sensor on a split crankshaft of a mid-mounted motor to solve the problems existing in the prior art. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a structure for placing a torque sensor on a split crankshaft of a mid-mounted motor, so as to solve the problem that the existing method is to place it directly on a single machined crankshaft, but the overall radial dimension of this installation method is too large, which does not meet the current design requirements for motor miniaturization.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A structure for placing a torque sensor on a split crankshaft of a mid-drive motor includes a left crankshaft of the mid-drive motor, a torque sensor controller, a torque sensor elastomer, a clutch support, a right crankshaft of the mid-drive motor, and screws.

[0008] The left crankshaft of the mid-mounted motor is provided with spline one and spline two at both ends respectively. The torque sensor controller is rotatably connected to the torque sensor elastomer. The torque sensor controller is provided with an internal spline one inside, which engages with spline one. The clutch support is provided with an internal spline three on the inner side of one end. The torque sensor elastomer is provided with a spline three on the surface, which engages with internal spline three. Spline two is engaged with internal spline two.

[0009] Preferably, the left crankshaft of the mid-mounted motor passes through the clutch support and its end is connected to the right crankshaft of the mid-mounted motor by a screw thread.

[0010] Preferably, the housing of the torque sensor controller is equipped with an anti-rotation rib, which is used to prevent the torque sensor controller from rotating due to friction when the left crankshaft of the central motor drives the torque sensor elastomer to rotate.

[0011] Preferably, a strain gauge for detecting deformation needs to be placed on the elastomer of the torque sensor.

[0012] Preferably, both the end of the left crankshaft of the mid-mounted motor and the end of the right crankshaft of the mid-mounted motor are provided with foot pedal connection splines.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention places the torque sensor between the left and right crankshafts of the mid-drive motor. By utilizing the internal dimensions of the crankshafts, it saves radial space for the torque sensor. Compared to existing designs that place the torque sensor directly on a single machined crankshaft, this invention keeps the diameter of the entire torque sensor within 22mm, meeting the current design requirements for motor miniaturization.

[0015] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings.

[0016] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the 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 based on these drawings without creative effort. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is an exploded view of the structure of this utility model;

[0019] Figure 2 This is a structural diagram of the present invention after assembly;

[0020] Figure 3 This is a cross-sectional view of the structure of this utility model after assembly;

[0021] Figure 4 This is an exploded plan view of the present invention;

[0022] Figure 5 for Figure 4 CC section view.

[0023] In the diagram: 1. Left crankshaft of the mid-mounted motor; 11. Spline 1; 12. Spline 2; 2. Torque sensor controller; 21. Internal spline 1; 3. Torque sensor elastomer; 31. Spline 3; 4. Clutch support; 41. Internal spline 3; 5. Right crankshaft of the mid-mounted motor; 6. Screw; 51. Internal spline 2. Detailed Implementation

[0024] 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. In the following description, specific details such as specific configurations and components are provided merely to help fully understand the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. In addition, for clarity and brevity, descriptions of known functions and structures are omitted in the embodiments.

[0025] Furthermore, reference numerals and / or letters may be repeated in different examples within this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0026] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another type of relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0027] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0028] Please see Figure 1-5 This utility model provides a technical solution for a torque sensor placement structure on a split crankshaft of a mid-mounted motor: including a left crankshaft 1 of the mid-mounted motor, a torque sensor controller 2, a torque sensor elastomer 3, a clutch support 4, a right crankshaft 5 of the mid-mounted motor, and a screw 6.

[0029] Spline 11 and spline 212 are respectively provided at both ends of the crankshaft 1 on the left side of the mid-mounted motor. The torque sensor controller 2 is rotatably connected to the torque sensor elastic body 3. The torque sensor controller 2 is provided with an internal spline 21, which is engaged with spline 11. An internal spline 31 is provided on the inner side of one end of the clutch support 4. Spline 31 is provided on the surface of the torque sensor elastic body 3, which is engaged with internal spline 341. Spline 212 is engaged with internal spline 251.

[0030] The left crankshaft 1 of the mid-mounted motor passes through the clutch support 4, and its end is connected to the right crankshaft 5 of the mid-mounted motor by screws 6.

[0031] The torque sensor controller 2 is equipped with an anti-rotation rib on its housing. The anti-rotation rib is used to prevent the torque sensor controller 2 from rotating due to friction when the left crankshaft 1 of the central motor drives the torque sensor elastomer 3 to rotate.

[0032] A strain gauge for detecting deformation needs to be placed on the torque sensor elastomer 3.

[0033] Foot pedal connection splines are provided at the end of the left crankshaft 1 of the mid-drive motor and the end of the right crankshaft 5 of the mid-drive motor.

[0034] In practical use, first insert the torque sensor controller 2 into one end of the left crankshaft 1 of the mid-drive motor, and engage the inner spline 21 of the torque sensor controller 2 with the spline 11. Then insert the left crankshaft 1 of the mid-drive motor into the clutch support 4, and engage the spline 31 with the inner spline 41. Next, insert the right crankshaft 5 of the mid-drive motor into the end of the left crankshaft 1 of the mid-drive motor, so that the spline 12 engages with the inner spline 51. Finally, connect the left crankshaft 1 of the mid-drive motor and the right crankshaft 5 of the mid-drive motor with screws 6 to complete the installation. Compared with the existing torque sensor structure, the diameter of the entire torque sensor can be controlled within 22mm.

[0035] The above description is merely a preferred embodiment of this utility model and does not limit the scope of protection of this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any changes, modifications, substitutions, integrations, and parameter alterations made to these embodiments within the spirit and principles of this utility model, through conventional substitutions or methods that achieve the same function without departing from the principles and spirit of this utility model, fall within the scope of protection of this utility model.

Claims

1. A structure for placing a torque sensor on a split crankshaft of a mid-mounted motor, characterized in that: Includes the left crankshaft (1) of the mid-mounted motor, torque sensor controller (2), torque sensor elastomer (3), clutch support (4), right crankshaft (5) of the mid-mounted motor, and screws (6); The two ends of the crankshaft (1) on the left side of the central motor are respectively provided with spline one (11) and spline two (12). The torque sensor controller (2) is rotatably connected to the torque sensor elastomer (3). The torque sensor controller (2) is provided with an inner spline one (21) inside. The inner spline one (21) is engaged with spline one (11). The inner side of one end of the clutch support (4) is provided with an inner spline three (41). The surface of the torque sensor elastomer (3) is provided with spline three (31). The spline three (31) is engaged with the inner spline three (41). The spline two (12) is engaged with the inner spline two (51).

2. The torque sensor placement structure for a split crankshaft in a mid-mounted motor as described in claim 1, characterized in that: The left crankshaft (1) of the mid-mounted motor passes through the clutch support (4), and its end is threadedly connected to the right crankshaft (5) of the mid-mounted motor by a screw (6).

3. The torque sensor placement structure for a split crankshaft in a mid-mounted motor as described in claim 1, characterized in that: The torque sensor controller (2) is equipped with an anti-rotation rib on its housing. The anti-rotation rib is used to prevent the torque sensor controller (2) from rotating due to friction when the left crankshaft (1) of the central motor drives the torque sensor elastomer (3) to rotate.

4. The structure for placing a torque sensor on a split crankshaft of a mid-mounted motor as described in claim 1, characterized in that: A strain gauge for detecting deformation needs to be placed on the torque sensor elastomer (3).

5. The structure for placing a torque sensor on a split crankshaft of a mid-mounted motor as described in claim 1, characterized in that: Foot pedal connection splines are provided at the end of the left crankshaft (1) of the mid-mounted motor and the end of the right crankshaft (5) of the mid-mounted motor.

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