CN211995983U - Pedal force sensing mechanism of electric bicycle - Google Patents

Abstract

The utility model discloses a pedal force sensing mechanism of an electric bicycle, which includes a crankshaft, a sleeve, one or more sensing units and a control unit. The sleeve is sleeved on the crankshaft and a one-way device is used for one-way transmission with the crankshaft. The sensing units are arranged on the sleeve at equal intervals to sense the torque of the sleeve and generate a plurality of sensing signals respectively. The control unit is electrically connected to the sensing unit to receive the sensing signals of the sensing unit and calculate the average value of the torque corresponding to these sensing signals, so that the control unit controls the motor to output the corresponding assistance according to the average value. In this way, the utility model adopts the average value method so that the installation position of the sensing unit will not be restricted, so as to increase the convenience of installation and improve the sensing accuracy.

Description

Pedal force sensing mechanism of electric bicycle

technical field

The utility model relates to the related field of electric bicycles, in particular to a pedal force sensing mechanism of an electric bicycle.

Background technique

In order to reduce the burden on the rider, the general electric bicycle usually installs a sensor on the crankshaft. By sensing the numerical changes such as the speed or torque of the crankshaft, the controller can control the power provided by the assist motor according to the sensing result. boost size.

The method disclosed in the Chinese Patent No. M453843 is mainly to attach the bending moment strain gauge and the torque strain gauge to the center of the crankshaft at a predetermined angle to sense the bending moment and torque acting on the crankshaft. The amount of strain generated when the crankshaft is used to determine the pedaling force signal at the left and right ends of the crankshaft. However, in the aforementioned patent documents, the bending moment strain gauge and the torque strain gauge are sensed individually, and the accuracy still needs to be improved.

The method disclosed in the Chinese Patent No. I564214 is mainly to use a plurality of strain gauges to sense the strain generated by the axial force of the beam as the torque sensing value between the crankshaft and the chainring, so as to improve the torque sensing precision. However, in the aforementioned patent documents, the process of attaching multiple strain gauges to the beam is rather inconvenient.

Utility model content

The main purpose of the present invention is to provide a pedal force sensing mechanism of an electric bicycle, which can increase the convenience of installation and improve the sensing accuracy.

In order to achieve the above-mentioned main purpose, the pedaling force sensing mechanism of the first embodiment of the present invention includes a crankshaft, a shaft sleeve, a one-way device, a plurality of sensing units, and a control unit. The shaft sleeve is rotatably sleeved on the crankshaft; the one-way device is arranged between the crankshaft and the shaft sleeve to provide a one-way transmission effect; the sensing units are arranged in equal intervals The shaft sleeve is used for sensing the torque of the shaft sleeve and correspondingly generating a sensing signal; the control unit is electrically connected to the sensing units to receive the sensing signals of the sensing units and calculate the sensing signals. The average value of the torque corresponding to the measured signal, so that the control unit controls the motor to output the corresponding assist according to the average value.

Preferably, each of the sensing units is a strain gauge and is directly attached to the outer peripheral surface of the bushing.

In order to achieve the above-mentioned main purpose, the pedaling force sensing mechanism of the second embodiment of the present invention includes a crankshaft, a shaft sleeve, a one-way device, a sensing unit, and a control unit. The shaft sleeve is made of magnetized material, and the shaft sleeve is rotatably sleeved on the crankshaft; the one-way device is arranged between the crankshaft and the shaft sleeve to provide a one-way transmission effect; The sensing units are equally spaced around the shaft sleeve for sensing the torque of the shaft sleeve and correspondingly generate a plurality of sensing signals; the control unit is electrically connected to the sensing unit for receiving the sensing unit The sensing signals are obtained, and the average value of the torque corresponding to the sensing signals is calculated, so that the control unit controls the motor to output the corresponding assist according to the average value.

Preferably, the sensing unit has a mounting seat and a plurality of sensors, the mounting seat has a ring portion and two sensing portions, the ring portion has a sleeve hole sleeved on the shaft sleeve, the two The sensing portion protrudes from a side surface of the ring portion and is located on two opposite sides of the sleeve hole, each sensing portion has a receiving groove, and each receiving groove is provided with at least one of the sensor and one of the control unit. Through the above technical features, the two sensors can infer the relative position between themselves and the bushing, and then obtain the torque generated by the bushing, so that the two control units control the motor to output corresponding assist.

As can be seen from the above, the pedaling force sensing mechanism of the present invention does not limit the installation position of the sensing unit by adopting an average value, so as to increase the convenience of installation and improve the sensing accuracy.

The detailed structure, features, assembly or usage of the pedaling force sensing mechanism for electric bicycles provided by the present invention will be described in the detailed description of the following embodiments. However, those of ordinary skill in the field of the present utility model should understand that these detailed descriptions and the specific embodiments enumerated for implementing the present utility model are only used to illustrate the present utility model, and are not intended to limit the scope of the patent application of the present utility model.

Description of drawings

1 is a perspective view of a pedaling force sensing mechanism according to a first embodiment of the present invention;

2 is a partial perspective exploded view of the pedaling force sensing mechanism according to the first embodiment of the present invention;

3 is a cross-sectional view of the pedaling force sensing mechanism according to the first embodiment of the present invention;

4 is a perspective view of the appearance of the pedal force sensing mechanism used with a motor according to the first embodiment of the present invention;

5 is a cross-sectional view of the pedal force sensing mechanism used with a motor according to the first embodiment of the present invention;

6 is a perspective view of a pedaling force sensing mechanism according to a second embodiment of the present invention;

7 is a partial perspective exploded view of the pedaling force sensing mechanism of the second embodiment of the present invention;

8 is a partial cross-sectional view of a pedaling force sensing mechanism according to a second embodiment of the present invention.

Symbol Description:

10: pedal force sensing mechanism

12: pedal force sensing mechanism

20: Crankshaft

30: Bushing

32: First ring teeth

34: Second ring teeth

36: Department under test

38: Collar part

40: Sensing unit

42: Control unit

50: Motor

51: Shell

52: Reducer

53: Transmission gear

54: Unidirectional

55: Unidirectional

60: Sensing unit

61: Mounting seat

62: Ring Department

63: Sensing part

64: Container

65: Sensor

66: Control unit

70: Bushing

71: Department under test

Detailed ways

The applicant first explains that in the entire specification, including the embodiments described below and the claims in the scope of the application, the terms related to the directionality are based on the directions in the drawings. Next, in the embodiments to be introduced below and the accompanying drawings, the same element numbers represent the same or similar elements or their structural features.

Please refer to FIG. 1 and FIG. 2 , the pedaling force sensing mechanism 10 of the first embodiment of the present invention is disposed in a housing 51 and includes a crankshaft 20 , a shaft sleeve 30 , a one-way device 54 , two sensors measurement unit 40, and a control unit 42.

The left and right ends of the crankshaft 20 protrude out of the casing 51 (as shown in FIG. 4 ) and are assembled by a crank arm (not shown in the figure) and a pedal (not shown in the figure) respectively, so that the crankshaft 20 is assembled. It can be rotated by the driving of left and right pedals.

The shaft sleeve 30 is sleeved on the crankshaft in a coaxial manner. The shaft sleeve 30 has a first ring tooth portion 32, a second ring tooth portion 34, a measured portion 36 and a collar portion 38 in sequence from left to right, wherein the first ring tooth portion 32 is used for tracking The toothed plate (not shown in the figure) is assembled so that the shaft sleeve 30 and the large toothed plate can act synchronously. .

The one-way device 54 is arranged in the collar portion 38 of the shaft sleeve 30 and is connected to the crankshaft 20, as shown in FIG. The crankshaft 20 cannot be driven by the reverse rotation.

The two sensing units 40 are both strain gauges in this embodiment. As shown in FIG. 2 and FIG. 3 , the two sensing units 40 are attached to the detected portion 36 of the shaft sleeve 30 and disposed at 180 degrees relative to the axis of the crankshaft 20 , so as to sense that the shaft sleeve 30 is received from the crankshaft. The torque generated when the pedaling force transmitted from 20 acts, and correspondingly generates a sensing signal.

The control unit 42 is sleeved on the shaft sleeve 30 and is electrically connected to the two sensing units 40 for receiving the sensing signals of the two sensing units 40 and calculating the average value of the torque corresponding to the two sensing signals, and then The control motor 50 outputs the corresponding assisting force.

As can be seen from the above, when the motor 50 is driven, as shown in FIG. 5 , the motor 50 drives the transmission gear 53 through the reducer 52 , and then the transmission gear 53 drives the shaft sleeve 30 to provide auxiliary power. However, when the motor 50 is not driven, even if the shaft sleeve 30 is driven to rotate, under the action of the one-way device 55, the rotation of the shaft sleeve 30 will not be fed back to the motor 50 via the reducer 52, so as to avoid causing the motor 50 to rotate. damage.

The pedaling force sensing mechanism 12 of the second embodiment of the present invention provides another way to sense the torque of the shaft sleeve 70. As shown in FIG. 6 and FIG. 7 , the sensing unit 60 has a mounting seat 61 and four sensors 65 , the mounting seat 61 has a ring portion 62 and two sensing portions 63 , and the ring portion 62 is sleeved on the shaft sleeve In the measured portion 71 of 70 , the two sensing portions 63 protrude from one side of the ring portion 62 and are located on two opposite sides of the measured portion 71 of the sleeve 70 . In addition, as shown in FIG. 8 , each sensing portion 63 has one accommodating groove 64, and each accommodating groove 64 is provided with two sensors 65 therein. In addition, the axle sleeve 70 is made of magnetized material, and the relative position between the axle sleeve 70 and the axle sleeve 70 can be inferred by the arrangement of the plurality of sensors 65, and then the pedaling force exerted by the rider on the axle sleeve 70 can be obtained. When the torque is generated, the control unit 66 controls the motor 50 to output the corresponding assist according to the average value of the torque.

However, it should be added that, in order to more accurately sense the pedaling force transmitted from the crankshaft 20 to the bushing 30 via the one-way device 54 , the number of the aforementioned sensing units 40 or the aforementioned sensors 65 can be determined according to the actual situation. For adjustment, as long as they are arranged at equal intervals, for example, if the number is three, they are separated from each other by 120 degrees, if there are four, they are separated by 90 degrees from each other, and so on.

To sum up, the pedaling force sensing mechanisms 10 and 12 of the present invention adopt the average value method, so that the installation positions of the two sensing units 40 and the plurality of sensors 60 only need to be separated by 180 degrees. Reducing restrictions on use, thereby achieving the purpose of increasing the convenience of use and improving the sensing accuracy.

Claims (4)

1. A pedaling force sensing mechanism of an electric bicycle, characterized in that, comprises: a crankshaft; a shaft sleeve, rotatably sleeved on the crankshaft; a one-way device, between the crankshaft and the bushing, to allow the crankshaft to rotate in one direction relative to the bushing; a plurality of sensing units, disposed on the outer peripheral surface of the bushing and arranged at equal intervals, for sensing the torque of the bushing, and correspondingly generating a sensing signal; and A control unit is electrically connected to the sensing units for receiving sensing signals of the sensing units and calculating an average value of torques corresponding to the sensing signals. 2 . The pedaling force sensing mechanism of an electric bicycle according to claim 1 , wherein each of the sensing units is a strain gauge and is attached to the outer peripheral surface of the axle sleeve. 3 . 3. A pedaling force sensing mechanism of an electric bicycle, characterized in that, comprising: a crankshaft; a shaft sleeve, rotatably sleeved on the crankshaft, the shaft sleeve is made of magnetized material; a one-way device, between the crankshaft and the bushing, to allow the crankshaft to rotate in one direction relative to the bushing; a sensing unit, disposed around the bushing at equal intervals, for sensing the torque of the bushing, and correspondingly generating a plurality of sensing signals; and A control unit is electrically connected to the sensing unit for receiving the sensing signals of the sensing unit and calculating the average value of the torque corresponding to the sensing signals. 4 . The pedal force sensing mechanism of an electric bicycle according to claim 3 , wherein the sensing unit has a mounting seat and a plurality of sensors, and the mounting seat has a ring portion and two sensing portions, 5 . The ring portion is sleeved on the shaft sleeve, the two sensing portions protrude from one side surface of the ring portion and are located on two opposite sides of the shaft sleeve, each of the sensing portions has an accommodating groove, each of the accommodating portions At least one of the sensors is arranged in the groove.

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