Torque sensor, mounting structure, gearbox and electric power-assisted bicycle

Abstract

The utility model relates to the technical field of electric power-assisted bicycles, in particular to a torque sensor, an installation structure of the torque sensor, a gearbox and an electric power-assisted bicycle. According to the torque sensor, the sensor shell is installed on the gearbox shell, the internal splines at the two ends of the inner side of the cylinder are connected with the gearbox output gear and the gearbox crankset installation piece respectively, and the torque sensor is small in structure, convenient to install and particularly suitable for torque sensing in an electric power-assisted bicycle with a center shaft gearbox. The torque sensor adopts internal and external spline connection, and is reliable in connection, good in consistency and compact in structure. According to the gearbox and the electric power-assisted bicycle with the gearbox, the torque sensor is arranged on the gearbox with variable gears, so that labor is saved during gear shifting, judgment can be carried out according to the sensed manpower, the riding state and intention of a rider are further understood, corresponding power support is provided, more labor is saved during use, and the riding comfort is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power-assisted bicycles, in particular to a torque sensor. Background Art

[0002] Currently, most electric-assisted bicycles are hybrid cycling tools based on traditional bicycles and equipped with an electric power system with a torque sensor as the core. Their biggest feature is that they use torque sensors to sense the force of the rider's pedaling, make judgments based on the amount of human power sensed, and then understand the rider's riding status and intentions, and provide corresponding power support.

[0003] Most of the torque sensors for electric-assisted bicycles on the current market are directly installed on the middle axis of the bicycle. They can provide assistance to a certain extent when riding a bicycle, but they are not suitable for more labor-saving electric-assisted bicycles with middle axis gearboxes and cannot meet the needs of use. There is an urgent need to provide a solution. Utility Model Content

[0004] The utility model aims at the deficiencies of the prior art and provides a torque sensor which has a compact structure, is easy to install and can be applied to a gearbox with a middle shaft; meanwhile, it also provides a mounting structure of the torque sensor, a gearbox and an electric power-assisted bicycle.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The utility model provides a torque sensor, comprising a sensor housing and a sensor assembly; the sensor assembly comprises a cylinder installed in the sensor housing and a wiring board connected to the cylinder, the wiring board cover is arranged at one end of the sensor housing; at least one resistance strain gauge is arranged on the cylinder; the inner sides of both ends of the cylinder are provided with internal splines.

[0007] Preferably, a clearance groove is provided between the internal splines at both ends of the cylinder.

[0008] Preferably, a clearance boss is provided on a side of the wiring board away from the cylinder, and the clearance boss is used to prevent the wiring board from contacting the gears of the gearbox.

[0009] Preferably, a step which covers the sensor housing is provided on a surface of the wiring board close to the cylinder.

[0010] Preferably, the sensor housing is provided with a wire outlet penetrating the sensor housing and a mounting hole communicating with the cylinder.

[0011] Preferably, the sensor housing is provided with a fixing pin for mounting with a gearbox housing.

[0012] The utility model also provides a mounting structure of a torque sensor, including a gearbox output gear and a gearbox tooth plate mounting member; and also includes the above-mentioned torque sensor;

[0013] A first external spline is provided at one end of the gearbox output gear; a second external spline is provided at one end of the gearbox sprocket mounting piece, the first external spline is matched and connected with the internal spline at one end of the cylinder, and the second external spline is matched and connected with the internal spline at the other end of the cylinder.

[0014] The utility model also provides a gearbox, which comprises the installation structure of the torque sensor.

[0015] The utility model also provides an electric power-assisted bicycle, which comprises the above-mentioned gearbox.

[0016] Beneficial effects of the utility model:

[0017] In actual application, the torque sensor is installed in the gearbox housing using a sensor housing, and the internal splines at both ends of the inner side of the cylinder are respectively connected to the gearbox output gear and the gearbox tooth plate mounting member. The resistance strain gauge on the cylinder is used to obtain the strain of the cylinder when it is working, so as to obtain the change of torque when riding a bicycle, so that the motor of the electric power-assisted bicycle can provide matching riding assistance according to the riding environment and state. The torque sensor has a compact structure and is easy to install. It is particularly suitable for torque sensing in electric power-assisted bicycles with a mid-shaft gearbox and has strong practicality.

[0018] The installation structure of the torque sensor is easy to install, and adopts internal and external spline connection, which has reliable connection, good consistency and compact structure. It is particularly suitable for torque sensing in electric power-assisted bicycles with a mid-shaft gearbox, and has strong practicality.

[0019] The gearbox and the electric power-assisted bicycle thereof are provided with a torque sensor on the gear-variable gearbox, which not only provides labor-saving gear shifting, but also can make judgments based on the amount of human power sensed, and then understand the riding status and intention of the rider, and provide corresponding power support, making the rider more labor-saving when using and improving the riding comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the torque sensor of the utility model.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the torque sensor of the utility model from another perspective. Figure 3 It is a schematic diagram of the exploded structure of the torque sensor of the utility model.

[0022] Figure 4This is a schematic diagram of the decomposed structure of the torque sensor of the utility model from another perspective.

[0023] Figure 5 It is a structural schematic diagram of the installation structure of the torque sensor of the utility model.

[0024] Figure 6 It is a schematic diagram of the exploded structure of the installation structure of the torque sensor of the utility model. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings, and the contents mentioned in the implementation modes are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.

[0026] refer to Figures 1 to 6 As shown, the utility model provides a torque sensor, including a sensor housing 1 and a sensor assembly 2; the sensor assembly 2 includes a cylinder 21 installed in the sensor housing 1 and a wiring board 22 connected to the cylinder 21, and the wiring board 22 is covered on one end of the sensor housing 1; at least one resistance strain gauge 23 is arranged on the cylinder 21; and internal splines 24 are arranged on the inner sides of both ends of the cylinder 21. Specifically, the cylinder 21 can be made of elastic sensitive material; the circuit or circuit board required by the sensor can be installed on the wiring board 22, so as to effectively utilize the limited space and reduce the volume of the torque sensor.

[0027] In actual application, the torque sensor adopts the sensor housing 1 to be installed in the gearbox housing, and adopts the internal splines 24 at both ends of the inner side of the cylinder 21 to be connected with the gearbox output gear 3 and the gearbox tooth plate mounting member 4 respectively. The resistance strain gauge 23 on the cylinder 21 is used to obtain the strain of the cylinder 21 when it is working, so as to obtain the change of the torque when the bicycle is riding, so that the motor of the electric power-assisted bicycle can provide matching riding assistance according to the riding environment and state. The torque sensor has a compact structure and is easy to install. It is particularly suitable for torque sensing in electric power-assisted bicycles with a mid-shaft gearbox and has strong practicality.

[0028] In this embodiment, preferably, a clearance groove 25 is provided between the internal splines 24 at both ends of the cylinder 21, so that the strain effect of the cylinder 21 is good, so that the torque sensor has high sensing accuracy and good use effect.

[0029] In this embodiment, preferably, a clearance boss 26 is provided on a side of the wiring board 22 away from the cylinder 21, and the clearance boss 26 is used to prevent the wiring board 22 from contacting the gears of the gearbox, thereby improving the reliability and stability of the product and increasing its service life.

[0030] In this embodiment, preferably, a step 27 for covering the sensor housing 1 is provided on a surface of the wiring board 22 close to the cylinder 21 , so as to facilitate the covering connection between the wiring board 22 and the sensor housing 1 .

[0031] In this embodiment, preferably, the sensor housing 1 is provided with a wire outlet 11 penetrating the sensor housing 1, and the cable of the torque sensor extends from the wire outlet 11, which is convenient for connection with technical devices such as a controller and a motor; a mounting hole 12 connected to the cylinder 21 is provided; and the torque sensor is convenient for installation and connection.

[0032] In this embodiment, preferably, the sensor housing 1 is provided with a fixing pin 13 for mounting with the gearbox housing. The fixing pin 13 is used to mount the torque sensor in the gearbox housing, and the installation is convenient and reliable.

[0033] refer to Figures 5 and 6 As shown, the utility model also provides a mounting structure of a torque sensor, including a gearbox output gear 3 and a gearbox sprocket mounting member 4; and also includes the above-mentioned torque sensor; one end of the gearbox output gear 3 is provided with a first external spline 31; one end of the gearbox sprocket mounting member 4 is provided with a second external spline 41, the first external spline 31 is matched and connected with the internal spline 24 at one end of the cylinder 21, and the second external spline 41 is matched and connected with the internal spline 24 at the other end of the cylinder 21. The mounting structure of the torque sensor is easy to install, and adopts internal and external spline connection. The connection is reliable, the consistency is good, and the structure is compact. It is particularly suitable for torque sensing in an electric power-assisted bicycle with a mid-shaft gearbox. With such an installation method, not only is the structure compact, but the torque sensor can obtain the output torque induction when working in each gear position, and has strong practicality.

[0034] refer to Figures 5 and 6 As shown, the utility model also provides a gearbox, which includes the installation structure of the torque sensor mentioned above. With such an installation method, not only is the structure compact, but the torque sensor can obtain the induction of the output torque when working in each gear. The torque sensor is arranged on the gear-variable gearbox. In addition to providing labor-saving gear shifting, it can also make judgments based on the size of the sensed manpower, and then understand the rider's riding status and intentions, provide corresponding power support, make it more labor-saving when using, and improve riding comfort.

[0035] The utility model also provides an electric power-assisted bicycle, which includes the above-mentioned gearbox. A torque sensor is arranged on the gear-variable gearbox. In addition to providing labor-saving gear shifting, the torque sensor can also make judgments based on the sensed human power, and then understand the rider's riding status and intentions, and provide corresponding power support, making the rider more labor-saving when using it and improving the riding comfort.

[0036] The above is only a preferred embodiment of the utility model, and does not constitute any form of limitation to the utility model. Although the utility model is disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent changes and modifications made to the above embodiments according to the technology of the utility model, which do not depart from the content of the technical solution of the utility model, are within the scope of the technical solution of the utility model.

Claims

1. A torque sensor, characterized in that: It comprises a sensor housing (1) and a sensor component (2); The sensor assembly (2) comprises a cylinder (21) installed in the sensor housing (1) and a wiring board (22) connected to the cylinder (21), wherein the wiring board (22) is covered on one end of the sensor housing (1); At least one resistance strain gauge (23) is arranged on the cylinder (21); and internal splines (24) are arranged on the inner sides of both ends of the cylinder (21).

2. A torque sensor according to claim 1, characterized in that: A clearance groove (25) is provided between the internal splines (24) at both ends of the cylinder (21).

3. A torque sensor according to claim 1, characterized in that: A clearance boss (26) is provided on one side of the wiring board (22) away from the cylinder (21), and the clearance boss (26) is used to prevent the wiring board (22) from contacting the gears of the gearbox.

4. A torque sensor according to claim 1, characterized in that: The wiring board (22) is provided with a step (27) on a surface close to the cylinder (21) for covering the sensor housing (1).

5. The torque sensor according to claim 1, characterized in that: The sensor housing (1) is provided with a wire outlet (11) penetrating the sensor housing (1) and a mounting hole (12) communicating with the cylinder (21).

6. A torque sensor according to claim 1, characterized in that: The sensor housing (1) is provided with a fixing pin (13) for mounting with a gearbox housing.

7. A torque sensor mounting structure, comprising a gearbox output gear (3) and a gearbox sprocket mounting member (4); characterized in that: Also includes the torque sensor according to any one of claims 1 to 6; One end of the gearbox output gear (3) is provided with a first external spline (31); one end of the gearbox toothed disc mounting member (4) is provided with a second external spline (41), the first external spline (31) is matched and connected with an internal spline (24) at one end of the cylinder (21), and the second external spline (41) is matched and connected with an internal spline (24) at the other end of the cylinder (21).

8. A gearbox, characterized in that: The gearbox includes the mounting structure of the torque sensor according to claim 7.

9. An electric power-assisted bicycle, characterized in that: The electric-assisted bicycle comprises the gearbox as claimed in claim 8.

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