CN210634697U - Pedal force sensing device of electric bicycle - Google Patents

Abstract

The utility model provides an electric bicycle's power of stepping on sensing device, it includes a crank axle, the right-hand member of crank axle is equipped with a axle sleeve, a foil gage is established to the periphery face subsides of axle sleeve, both ends are equipped with a left tooth bowl and a right tooth bowl respectively about the crank axle, a left side, be equipped with a bearing in the right tooth bowl respectively, two bearings support the both ends of controlling of crank axle about, make the crank axle can be relative left side together with the axle sleeve, right tooth bowl rotates, furthermore, the left end of crank axle is equipped with an annular gasket, set up an elastic component between annular gasket and the left bearing, through the dual collocation of annular gasket and elastic component, can effectively compensate the clearance that produces because of dimensional tolerance between each component, elasticity that provides through the elastic component in addition, make the axial displacement of crank axle keep in controllable within range.

Description

Pedal force sensing device of electric bicycle

Technical Field

The present invention relates to an electric bicycle, and more particularly to a pedal force sensing device for an electric bicycle.

Background

In order to reduce the burden of the rider, a sensor is usually installed on the crank shaft of a typical electric bicycle, and a controller controls the magnitude of the boosting force provided by the boosting motor according to the sensing result by sensing a change in a value such as a rotational speed or a torque of the crank shaft.

The conventional sensor needs to be installed to cooperate with other elements (such as a bearing or a bushing) installed on the crankshaft, but the number of related elements is large, and in addition, a gap is easily generated between the related elements due to the dimensional tolerance, and the gap may cause the axial displacement of the crankshaft during the rotation process, thereby affecting the sensing accuracy. Therefore, in order to solve the problem of the gap, it is common practice to use one or more annular washers to compensate for the gap, but because the actual size of the gap is difficult to grasp, it is difficult to achieve the desired effect by the arrangement of the annular washers.

SUMMERY OF THE UTILITY MODEL

The main objective of the present invention is to provide a pedal force sensing device for an electric bicycle, which can effectively eliminate the gap between the components caused by the dimensional tolerance.

In order to achieve the above objective, the pedal force sensor of the present invention comprises a crank shaft, a shaft sleeve, a tooth cup set, a bearing set, an annular washer, an elastic member, and a strain gauge. The outer peripheral surface of the left end of the crank shaft is provided with a first shoulder part and a second shoulder part; the shaft sleeve is fixedly arranged at the right end of the crankshaft, the left end of the shaft sleeve abuts against the second shoulder part of the crankshaft, and the outer peripheral surface of the shaft sleeve is provided with a third shoulder part; the tooth bowl group is provided with a left tooth bowl and a right tooth bowl, and the left tooth bowl and the right tooth bowl are respectively sleeved at the left end and the right end of the crank shaft; the bearing group is provided with a left bearing and a right bearing, the left bearing is arranged in the left tooth bowl and supports the left end of the crankshaft, the right bearing is arranged in the right tooth bowl and supports the right end of the crankshaft and abuts against the third shoulder part of the shaft sleeve, so that the crankshaft and the shaft sleeve can rotate relative to the left tooth bowl and the right tooth bowl together; the annular gasket is arranged at the left end of the crank shaft and is abutted against the first shoulder part of the crank shaft; the elastic piece is arranged at the left end of the crank shaft and is abutted between the left bearing and the annular gasket; the strain gauge is attached to the outer peripheral surface of the shaft sleeve and used for sensing the deformation of the shaft sleeve generated along with the rotation of the crankshaft.

Therefore, the pedal force sensing device of the present invention utilizes the dual arrangement of the annular washer and the elastic member to compensate the gap between the elements due to the dimensional tolerance, and the axial displacement of the crank shaft is kept within the controllable range by the elastic force provided by the elastic member.

Preferably, this left side dental bowl has a left snap ring groove, is equipped with one in this left snap ring groove and supports and lean on in the left buckle of this left bearing, and this right dental bowl has a right snap ring groove, is equipped with one in this right buckle groove and supports and lean on the right buckle in this right bearing, through the setting of this left and right buckle, can reach the effect of convenient equipment.

Preferably, the outer peripheral surface of the crankshaft has an outer key groove, the inner peripheral surface of the sleeve has an inner key groove, and a round key is arranged between the inner key groove and the outer key groove, and the crankshaft and the sleeve are fixed together through the round key.

Preferably, the right end of the crank shaft is provided with a large toothed disc adapter arranged adjacent to the right toothed bowl and an adapter nut arranged adjacent to the large toothed disc adapter, and the large toothed disc adapter is fixed on the shaft sleeve through the adapter nut.

The detailed structure, characteristics, assembly or use of the pedaling force sensing apparatus of the electric bicycle according to the present invention will be described in the following detailed description of the embodiments. However, those skilled in the art should understand that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Drawings

Fig. 1 is a perspective view of a pedaling force sensing apparatus according to the present invention;

FIG. 2 is a partially exploded perspective view of the pedal force sensor of the present invention;

fig. 3 is a partial sectional view of the pedal force sensing device of the present invention.

[ description of reference ]

10 pedaling force sensing device 20 crank shaft

21 left end and 22 right end

23 first shoulder 24 external keyway

25 second shoulder 30 sleeve

31 third shoulder 32 inner spline

33 round key 40 tooth bowl group

41 left tooth bowl 42 left snap ring groove

43 left bearing groove 44 left retaining ring

45 right tooth bowl 46 right snap ring groove

47 right bearing groove 48 right retaining ring

50 left bearing of bearing set 51

52 right bearing 53 ring washer

54 elastic piece 55 strain gauge

60 inner sleeve 61 induction magnet

62 outer tube 63 big fluted disc adapter

64 adapter nut

Detailed Description

In the description, including the embodiments described below and in the claims, directional terms are used throughout the description and drawings to refer to the same or like parts. Next, in the embodiments and the drawings to be described below, the same element numbers denote the same or similar elements or structural features thereof.

Referring to fig. 1 to 3, the pedal force sensing device 10 of the present invention includes a crank shaft 20, a shaft sleeve 30, a tooth bowl set 40, a bearing set 50, an annular washer 53, an elastic member 54, and a strain gauge 55.

The left and right ends 21, 22 of the crank axle 20 are used for assembly with two crank arms (not shown). The outer peripheral surface of the left end 21 of the crank shaft 20 has a first shoulder 23, and the outer peripheral surface of the crank shaft 20 near the center has an outer spline 24 and a second shoulder 25 adjacent to the outer spline 24.

The sleeve 30 is sleeved on the right end 22 of the crank shaft 20 and abuts against the second shoulder 25 of the crank shaft 20 with its left end. The sleeve 30 has a third shoulder 31 on the outer peripheral surface near the center, and the inner peripheral surface of the left end of the sleeve 30 has an inner key groove 32, and is inserted between the outer key groove 24 of the crankshaft 20 and the inner key groove 32 of the sleeve 30 through a round key 33, so that the sleeve 30 and the crankshaft 20 are fixed together and can rotate together with the crankshaft 20.

The dental bowl assembly 40 is assembled with a five-way tube (not shown). The tooth bowl group 40 is provided with a left tooth bowl 41 and a right tooth bowl 45, the left and right tooth bowls 44 and 45 are respectively sleeved at the left and right ends 21 and 22 of the crank shaft 20, the inner peripheral surface of the left tooth bowl 41 is provided with a left snap ring groove 42 and a left bearing groove 43 adjacent to the left snap ring groove 42 from outside to inside, the inner peripheral surface of the right tooth bowl 45 is provided with a right snap ring groove 46 and a right bearing groove 47 adjacent to the right snap ring groove 46 from outside to inside, and a left snap ring 44 and a right snap ring 48 are respectively arranged in the left and right snap ring grooves 42 and 46.

The bearing set 50 has a left bearing 51 and a right bearing 52, the left and right bearings 51, 52 are respectively disposed in the left bearing groove 43 of the left socket 41 and the right bearing groove 47 of the right socket 45 and respectively support the left and right ends 21, 22 of the crank shaft 20, the left end surface of the left bearing 51 abuts against the left retaining ring 44, the right end surface of the right bearing 52 abuts against the right retaining ring 48, and the left end surface of the right bearing 52 abuts against the third shoulder 31 of the shaft sleeve 30. Thereby, the crank shaft 20 can rotate together with the sleeve 30 relative to the left and right sockets 41, 45.

An annular washer 53 and an elastic member 54 are disposed at the left end 21 of the crank shaft 20, wherein the annular washer 53 abuts against the first shoulder 23 of the crank shaft 20, and the elastic member 54 abuts between the right end surface of the left bearing 51 and the annular washer 53. However, it should be noted that the elastic member 54 may be a wave spring or a compression spring, and the wave spring is taken as an example.

The strain gauge 55 is attached to the outer circumferential surface of the sleeve 30 for sensing the deformation of the sleeve 30 when rotating along with the crankshaft 20.

As described above, the pedal force sensing device 10 of the present invention utilizes the dual arrangement of the annular washer 53 and the elastic member 54 to compensate for the gap between the elements due to the dimensional tolerance, and further, the elastic force provided by the elastic member 54 keeps the axial displacement of the crank shaft 20 within a controllable range, so that the strain gauge 55 maintains a good sensing accuracy.

On the other hand, as shown in fig. 3, the pedal force sensing device 10 of the present invention further provides an inner sleeve 60, an induction magnet 61, an outer sleeve 62, a big-toothed disc adapter 63 and an adapter nut 64, wherein: the inner sleeve 60 is sleeved on the crankshaft 20 and abuts against the second shoulder 25 of the crankshaft 20 with the right end thereof; the induction magnet 61 is sleeved on the crankshaft 20 and is closely adjacent to the left end of the inner sleeve 60; the outer sleeve 62 is sleeved on the crank shaft 20 and is connected between the left and right tooth bowls 41 and 45, and a certain distance is kept between the outer sleeve and the inner sleeve 60; the big fluted disc adapter 63 is arranged at the right end 22 of the crank shaft 20 and is adjacently arranged on the right tooth bowl 45 for assembling with a big fluted disc (not shown); an adapter nut 64 is disposed at the right end 22 of the crankshaft 20 and adjacent to the large-toothed disk adapter 63 for securing the large-toothed disk adapter 63 to the shaft sleeve 30.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (6)

1. A pedal force sensing device for an electric bicycle, comprising:

a crank shaft having a left end and a right end, the outer peripheral surface of the left end having a first shoulder and a second shoulder;

a shaft sleeve, which is arranged at the right end of the crankshaft and one end of the shaft sleeve is abutted against the second shoulder part of the crankshaft, and the peripheral surface of the shaft sleeve is provided with a third shoulder part;

a tooth bowl group, which is provided with a left tooth bowl and a right tooth bowl, wherein the left tooth bowl and the right tooth bowl are respectively sleeved at the left end and the right end of the crank shaft;

a bearing set having a left bearing and a right bearing, wherein the left bearing is disposed in the left tooth bowl and supports the left end of the crankshaft, the right bearing is disposed in the right tooth bowl and supports the right end of the crankshaft and abuts against the third shoulder of the shaft sleeve, so that the crankshaft and the shaft sleeve can rotate together relative to the left and right tooth bowls;

the annular gasket is arranged at the left end of the crank shaft and is abutted against the first shoulder part of the crank shaft;

the elastic piece is arranged at the left end of the crank shaft and is abutted between the left bearing and the annular gasket; and

and the strain gauge is attached to the peripheral surface of the shaft sleeve.

2. The pedaling force sensing apparatus for an electric bicycle according to claim 1, wherein the left tooth bowl has a left snap ring groove, a left snap ring is disposed in the left snap ring groove, and the left snap ring abuts against the left bearing.

3. The pedaling force sensing apparatus for an electric bicycle according to claim 1, wherein said right tooth bowl has a right snap ring groove, a right snap ring is disposed in said right snap ring groove, and said right snap ring abuts against said right bearing.

4. The pedaling force sensing apparatus for an electric bicycle according to claim 1, wherein said left tooth bowl has a left snap ring groove, said left snap ring groove is provided with a left snap ring, said left snap ring abuts against said left bearing, said right tooth bowl has a right snap ring groove, said right snap ring groove is provided with a right snap ring, said right snap ring abuts against said right bearing.

5. A pedaling force sensing apparatus according to any one of claims 1 to 4, wherein the crank shaft has an outer key groove on the outer peripheral surface thereof, the sleeve has an inner key groove on the inner peripheral surface thereof, and a round key is provided between the inner and outer key grooves.

6. The pedaling force sensing apparatus for an electric bicycle according to any one of claims 1 to 4, wherein a large gear plate adapter adjacent to the right tooth bowl and an adapter nut adjacent to the large gear plate adapter are provided at the right end of the crank shaft.

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