A resistance strain type displacement sensor with quick mounting structure

Abstract

This utility model relates to a resistance strain gauge displacement sensor with a quick-release structure, belonging to the field of electric-assisted bicycles. The utility model includes a bottom bracket, a left bearing housing, a magnetic ring, a circuit board, a right bottom bracket, a left bearing, a strain gauge, and a right bearing. Both the left and right bearings are mounted outside the bottom bracket, with the left bearing installed inside the left bearing housing. Its structural features include a protective sleeve and an elastomer. The strain gauge is adhered to the elastomer. The spline on the outer wall of the left end of the elastomer is connected to the spline on the inner wall of the left bearing housing. The right bearing is installed at the right end of the elastomer. The circuit board is mounted on the elastomer. A magnetic ring is installed on the bottom bracket, cooperating with a Hall element on the circuit board. The protective sleeve is fitted outside the elastomer, with both ends abutting against the elastomer and the right bottom bracket, respectively. The left bearing housing and the right bottom bracket are threaded to the left and right ends of the bicycle bottom bracket, respectively.

Description

Technical Field

[0001] This utility model relates to a resistance strain gauge displacement sensor with a quick-release structure, belonging to the field of electric-assisted bicycles. Background Technology

[0002] After the bottom bracket torque sensor collects the signal, it needs to output the signal to the outside of the bottom bracket via a waterproof signal cable. Currently, when installing the product into the bicycle bottom bracket, the waterproof signal cable passes through a pre-drilled hole in the middle of the bottom bracket and extends outside. Generally, the waterproof signal cable is fixed to the elastomer. After the waterproof signal cable passes through the pre-drilled hole in the middle of the bottom bracket, the azimuth angle of the elastomer within the bottom bracket is essentially locked, preventing any large rotation angle. Furthermore, the principle of displacement deformation is used to obtain the torque generated by pedaling while riding a bicycle. Its structure also requires the elastomer to be in a pre-set, favorable displacement deformation range during installation. Therefore, the two are combined and set together: the azimuth angle of the waterproof signal cable passing through the pre-drilled hole in the middle of the bottom bracket simultaneously serves as the azimuth angle for fixing the elastomer within the bottom bracket. Then, the elastomer is locked in place by a threaded right bottom bracket seat. Sometimes, during the tightening process, the elastomer rotates with the right bottom bracket seat, causing a deflection of the set displacement deformation range azimuth angle, affecting the accuracy and precision of the sensor's electrical signal acquisition. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned deficiencies in the prior art and to provide a resistance strain gauge displacement sensor with a reasonable structural design and a quick-assembly structure.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows: This resistance strain gauge displacement sensor with a quick-release structure includes a central shaft, a left bearing housing, a magnetic ring, a circuit board, a right five-way connector, a left bearing, a strain gauge, and a right bearing. The left and right bearings are both fitted outside the central shaft, and the left bearing is installed inside the left bearing housing. Its structural features are: it also includes a protective sleeve and an elastic body. The strain gauge is pasted on the elastic body. The spline on the outer wall of the left end of the elastic body is connected to the spline on the inner wall of the left bearing housing. The right bearing is installed on the right end of the elastic body. The circuit board is installed on the elastic body. A magnetic ring is installed on the central shaft. The magnetic ring cooperates with a Hall element on the circuit board. The protective sleeve is fitted outside the elastic body, and the two ends of the protective sleeve abut against the elastic body and the right five-way connector, respectively.

[0005] Furthermore, the left bearing seat and the right bottom bracket seat are respectively threaded to the left and right ends of the bicycle bottom bracket seat.

[0006] Furthermore, the circuit board is mounted on the elastomer using fixing screws.

[0007] Furthermore, the circuit board is connected to a waterproof signal line.

[0008] Furthermore, an O-ring is installed between the right end of the elastomer and the right five-way connector.

[0009] Furthermore, a wave washer, a sealing ring, and a retaining ring are installed on the central shaft, with the wave washer located between the left bearing and the retaining ring.

[0010] Furthermore, the retaining ring contacts the sealing ring, which is located within the elastic body.

[0011] Compared with existing technologies, this utility model has the following advantages: This resistance strain gauge displacement sensor with a quick-installation structure sets the left bearing housing and the elastomer as separate structures. That is, the left bearing housing and the elastomer are connected by a spline. During installation, the left bearing housing can be first screwed and tightened to the left end of the bicycle bottom bracket. While the waterproof signal cable is inserted into the reserved hole of the bicycle bottom bracket, the splined end of the elastomer is inserted into the left bearing housing according to the pre-set orientation angle of the product. Then, the right bottom bracket is screwed and connected to the right end of the bicycle bottom bracket. It is then screwed and tightened from the right end of the bottom bracket to the left end to complete the installation. This achieves both allowing the waterproof signal cable to pass through the predetermined bottom bracket hole and completing the precise positioning and fixing of the displacement deformation orientation angle pre-set by the product. Attached Figure Description

[0012] Figure 1 This is a cross-sectional structural schematic diagram of a resistance strain gauge displacement sensor with a quick-assembly structure according to an embodiment of this utility model.

[0013] In the diagram: 1. Central shaft; 2. Waveform washer; 3. Sealing ring; 4. Left bearing seat; 5. Magnetic ring; 6. Circuit board; 7. Fixing screw; 8. Protective sleeve; 9. Right five-way connector; 10. O-ring waterproof seal; 11. Left bearing; 12. Snap ring; 13. Waterproof signal line; 14. Strain gauge; 15. Elastomer; 16. Right bearing. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0015] Example

[0016] See Figure 1As shown in the accompanying drawings, the structures, proportions, sizes, etc., depicted in this specification are merely for illustrative purposes to aid those skilled in the art and to provide a clear understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the use of terms such as "upper," "lower," "left," "right," "middle," and "one" in this specification is solely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0017] The resistance strain gauge displacement sensor with quick-release structure in this embodiment includes a central shaft 1, a left bearing seat 4, a magnetic ring 5, a circuit board 6, a protective sleeve 8, a right five-way connector 9, a left bearing 11, a strain gauge 14, an elastomer 15, and a right bearing 16.

[0018] In this embodiment, the left bearing 11 and the right bearing 16 are both fitted outside the central shaft 1, and the left bearing 11 and the right bearing 16 are respectively installed in the left bearing seat 4 and the elastic body 15. The left bearing seat 4 and the right bottom bracket seat 9 are respectively threaded to the left and right ends of the bicycle bottom bracket seat.

[0019] In this embodiment, the strain gauge 14 is attached to the elastomer 15. The spline on the outer wall of the left end of the elastomer 15 is connected to the spline on the inner wall of the left bearing seat 4. That is, the left end of the elastomer 15 is connected to the spline of the left bearing seat 4. The circuit board 6 is mounted on the elastomer 15 by fixing screws 7. The circuit board 6 is connected to the waterproof signal line 13.

[0020] In this embodiment, a magnetic ring 5 is installed on the central shaft 1. The magnetic ring 5 cooperates with the Hall element on the circuit board 6. The protective sleeve 8 is fitted on the outer circle of the elastic body 15, and the two ends of the protective sleeve 8 abut against the elastic body 15 and the right five-way connector 9 respectively. An O-ring waterproof ring 10 is installed between the outer circle of the right end of the elastic body 15 and the right five-way connector 9.

[0021] In this embodiment, a wave washer 2, a sealing ring 3 and a retaining ring 12 are installed on the left side of the central shaft 1. The wave washer 2 is located between the left bearing 11 and the retaining ring 12. The retaining ring 12 is in contact with the sealing ring 3, and the sealing ring 3 is embedded in the elastic body 15.

[0022] Specifically, during installation, the resistance strain gauge displacement sensor with quick-installation structure first screws the left bearing seat 4 into the left end of the bicycle bottom bracket, inserts the bottom bracket 1 into the left bearing seat 4 from the right end of the bottom bracket, inserts the elastic body 15 into the left bearing seat 4, and makes the elastic body 15 and the left bearing seat 4 connected by a spline. The protective sleeve 8 is then fitted over the elastic body 15. Finally, the right bottom bracket seat 9 is screwed into the right end of the bicycle bottom bracket, and the right bottom bracket seat 9 is pressed against the protective sleeve 8 to prevent the entire sensor from moving. The working principle is similar to that of the bottom bracket torque sensor with limit function disclosed in application number 202421613060.6.

[0023] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model are included within the protection scope of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined by the claims, all of which should fall within the protection scope of this utility model.

Claims

1. A resistance strain gauge displacement sensor with a quick-release structure, comprising a central shaft (1), a left bearing housing (4), a magnetic ring (5), a circuit board (6), a right five-way connector (9), a left bearing (11), a strain gauge (14), and a right bearing (16), wherein the left bearing (11) and the right bearing (16) are both fitted outside the central shaft (1), and the left bearing (11) is installed inside the left bearing housing (4), characterized in that: It also includes a protective sleeve (8) and an elastomer (15). The strain gauge (14) is attached to the elastomer (15). The spline on the outer wall of the left end of the elastomer (15) is connected to the spline on the inner wall of the left bearing seat (4). The right bearing (16) is installed on the right end of the elastomer (15). The circuit board (6) is installed on the elastomer (15). A magnetic ring (5) is installed on the central shaft (1). The magnetic ring (5) cooperates with the Hall element on the circuit board (6). The protective sleeve (8) is fitted over the elastomer (15), and the two ends of the protective sleeve (8) abut against the elastomer (15) and the right five-way connector (9), respectively.

2. The resistance strain gauge displacement sensor with a quick-release structure according to claim 1, characterized in that: The left bearing seat (4) and the right bottom bracket seat (9) are threaded to the left and right ends of the bicycle bottom bracket seat, respectively.

3. The resistance strain gauge displacement sensor with a quick-release structure according to claim 1, characterized in that: The circuit board (6) is mounted on the elastomer (15) by fixing screws (7).

4. The resistance strain gauge displacement sensor with a quick-release structure according to claim 1, characterized in that: The circuit board (6) is connected to the waterproof signal line (13).

5. The resistance strain gauge displacement sensor with a quick-release structure according to claim 1, characterized in that: An O-ring (10) is installed between the right end of the elastomer (15) and the right five-way seat (9).

6. The resistance strain gauge displacement sensor with a quick-release structure according to claim 1, characterized in that: A wave washer (2), a sealing ring (3) and a retaining ring (12) are installed on the central shaft (1), with the wave washer (2) located between the left bearing (11) and the retaining ring (12).

7. The resistance strain gauge displacement sensor with a quick-release structure according to claim 6, characterized in that: The retaining ring (12) contacts the sealing ring (3), which is located inside the elastomer (15).

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