TWM589678U - Power output mechanism of electric-assist bicycle - Google Patents

Abstract

This creation describes a power output mechanism of an electric power-assisted bicycle, which includes a housing, a crank shaft, a resultant force sleeve, a unidirectional device, a motor, and a number of detection and sensing elements. Wherein, the crank shaft is rotatably installed in the housing. The resultant sleeve is rotatably sleeved outside the crank shaft, and the resultant sleeve has a toothed disk connection portion and a power input portion. The unidirectional device is arranged between the crank shaft and the resultant sleeve. The motor is provided in the housing and connected to the power input part. The motor can be driven to rotate the resultant sleeve through the power input part. Through the above power output mechanism, the motor can rotate the resultant sleeve through the power input portion, thereby providing auxiliary power to the chainring, reducing the stepping burden of the rider when riding the bicycle.

Description

Power output mechanism of electric assist bicycle

This creation is about electric assisted bicycles, especially a power output mechanism for electric assisted bicycles.

The traditional electric power-assisted bicycle obtains forward power by the rider's pedaling power combined with the power provided by a power output mechanism (such as a central motor), so that the electric power-assisted bicycle does not cause too much physical strength to the rider The burden, and in addition to leisure can achieve the purpose of fitness.

Taiwan Certificate No. M417321U1 is known to describe a bicycle power assist control device, which includes a crank shaft 11 and a driving member 2. The driving member 2 is sleeved on the crank shaft 11 and can rotate with the crank shaft 11. In addition, the assist control device further includes a strain sensor 4 and a rotation speed detection unit 7. The strain sensor 4 is installed on the driving element 2, and the strain sensor 4 outputs a reaction drive according to the deformation amount of the driving element 2 The response signal of the deformation amount of the item 2. The rotation speed detection unit 7 is sleeved on the crank shaft 11 and outputs a rotation speed detection signal according to the rotation speed of the crank shaft 11.

However, it can be seen that the space configuration of the aforementioned power assist control device has not been perfected. The crankshaft 11 has been filled with various components, and the crankshaft 11 has almost no space for the motor to use, resulting in motor output The auxiliary power is difficult to be transmitted to the crankshaft 11 via any input gear.

One of the purposes of this creation is to improve the lack of existing technology, and to provide a new power output device for electric power-assisted bicycles, so that the motor can transmit the auxiliary power output to the gear disc to reduce the burden on the rider.

According to an embodiment of the present invention, a power output mechanism for an electric power-assisted bicycle includes: a housing, a crank shaft, a force sleeve, a first unidirectional device, a detection unit, and a device under test With one motor. Wherein, the crank shaft is rotatably installed in the housing. The combined force sleeve is rotatably sleeved outside the crank shaft. The combined force sleeve has a sprocket connection part, a power input part and a detection part. The power input part is provided between the sprocket connection part and the detection part between. The first unidirectional device is provided between the crank shaft and the resultant sleeve. The detection unit has a pedal force detector and a rotation speed detector. The pedal force detector is located in the detection section, the rotation speed detector is located in the joint force sleeve, and the rotation speed detector is relatively close to the detection section and relatively Keep away from the gear joint. The device under test is fixed on the crank shaft, and the rotation speed detector can detect the rotation of the device under test to obtain the rotation speed of the crank shaft. The motor is provided in the housing and connected to the power input part. The motor can be driven to rotate the resultant sleeve through the power input part.

Thereby, the motor can rotate the resultant force sleeve through the power input portion, thereby providing an auxiliary power to the gear disc, reducing the stepping burden of the rider when riding an electric bicycle. On the other hand, in terms of spatial configuration, the power input part is provided between the chainring connection part and the detection part and the rotation speed detector of the detection unit is relatively close to the detection part and relatively away from the chainring connection part, that is Bringing the components that involve power (such as the gear wheel and the motor) close to each other, and the components that involve detection (such as the pedal force detector and the speed detector) are also close to each other, not only can effectively shorten the transmission of auxiliary power The path enables the auxiliary power to be quickly transmitted to the gear plate, and it is not easily interfered by other components in signal detection.

In one aspect, the power output mechanism can be applied to a mountain bike or a road bike, but this creation is not limited to this.

In order to explain the technical features of this creation in detail, the following embodiments are described in conjunction with the drawings as follows. Among them, in order to facilitate the description of the following embodiments, the following embodiments will take the gear R on the right side of the power output mechanism 1 as the direction Benchmark.

As shown in FIGS. 1, 2 and 5, the power output mechanism 1 of an electric power-assisted bicycle provided by the embodiment includes a housing 10, a crank shaft 20, a combined force sleeve 30, and a first unidirectional device 40. A detection unit 50, a device under test 60 and a motor 70.

The casing 10 includes a first casing 11 and a second casing 12, the first casing 11 and the second casing 12 can be assembled into one body, and both the first casing 11 and the second casing 12 have a shaft hole 13, The housing 10 has a space inside to accommodate components such as the motor 70.

The crank shaft 20 is rotatably installed in the housing 10, the two ends of the crank shaft 20 respectively pass through the shaft holes 13 of the first housing 11 and the second housing 12, and the two ends of the crank shaft 20 are connected to a crank C respectively In order to connect the pedal through the crank C (not shown).

The resultant sleeve 30 is rotatably and coaxially sleeved outside the crank shaft 20. The resultant sleeve 30 is provided with a set of ring parts 31, a detection part 32, and a power input part 33 from left to right in sequence And a sprocket connection part 34 (that is, the power input part 33 is provided between the detection part 32 and the sprocket connection part 34), the power input part 33 and the sprocket connection part 34 are provided with ring teeth, wherein the sprocket The ring teeth of the connecting portion 34 are used to cooperate with an inner ring gear R1 of a ring gear R, so that the ring gear R can mesh with the ring teeth of the ring gear connecting portion 34 through the inner ring gear R1, so that the ring gear R can be coaxial It is sleeved on the resultant sleeve 30, and the gear R and the resultant sleeve 30 form a fixed structure.

The first unidirectional device 40 is provided between the crank shaft 20 and the collar portion 31 of the resultant sleeve 30, so that the crank shaft 20 can rotate the resultant sleeve 30 through the first unidirectional device 40, but the resultant sleeve 30 is reversed. During rotation, the resultant sleeve 30 cannot reversely pass the first unidirectional device 40 to rotate the crankshaft 20.

The detection unit 50 has a pedal force detector 51 and a rotation speed detector 52. The pedal force detector 51 is a strain gauge, which is attached to the detection part 32 (as shown in FIG. 5) and can detect the rider’s presence. When pedaling, the slight strain of the resultant sleeve 30 caused by the pedaling force applied by the rider is converted into an electrical signal, and the converted electrical signal is transmitted to the outside through the coil 53. In this embodiment, the rotation speed detector 52 is a Hall sensor, which is used to detect the rotation speed of the crankshaft 20. The rotation speed detector 52 is connected to the same circuit board 54 and is provided in the joint force sleeve 30, and the rotation speed The detector 52 is relatively close to the detection portion 32 and relatively away from the gear coupling portion 34. In this embodiment, the detection portion 32 is located between the rotation speed detector 52 and the power input portion 33.

As shown in FIGS. 4 and 5, the device under test 60 is fixed on the crankshaft 20. In this embodiment, the device under test 60 is a magnetic component, so that when the crankshaft 20 rotates with the magnetic component, the rotation speed The detector 52 can detect the change of the magnetic force of the device under test 60 to obtain the rotation speed of the crank shaft 20.

Please refer to FIG. 3. The motor 70 is disposed in the housing 10 and is located outside the joint sleeve 30. The motor 70 includes an output shaft 71 and a reducer 72. The output shaft 71 is sleeved with a first gear 73. The reducer 72 further includes a rotating shaft 74, a second unidirectional gear 75, a second gear 76 and a first transmission gear 77. Both ends of the rotating shaft 74 are provided with bearings B1, B2, and through the bearings B1, B2, and设于壳10. The second gear 76 coaxially sleeves the rotating shaft 74 through the second unidirectional device 75, and the second gear 76 meshes with the first gear 73. The first transmission gear 77 is coaxially sleeved on the rotating shaft 74, and the first transmission gear 77 is located between the second gear 76 and the bearing B2. The power output mechanism 1 further includes a second transmission gear 35 having a ring gear 351, and the second transmission gear 35 is a power coaxially sleeved with the joint sleeve 30 via the ring gear 351 The ring gear of the input portion 33 and the second transmission gear 35 mesh with the first transmission gear 77. Therefore, when the motor 70 is driven, the motor 70 can rotate the resultant sleeve 30 through the speed reducer 72 and the power input portion 33 to provide auxiliary power, and when the motor 70 is not driven, even if the resultant sleeve 30 is driven and Rotation, under the action of the second unidirectional device 75, the reducer 72 will be in an idling state, so that the rotation of the resultant sleeve 30 will not be fed back to the motor 70 via the reducer 72 in the reverse direction, avoiding the rotor 78 of the motor 70 The magnetic field generated by the stator 79 is cut to generate electricity, thereby damaging the motor 70.

Incidentally, as shown in FIG. 5, a bearing B3 is also sleeved on the crank shaft 20, and the bearing B3 is adjacent to the first unidirectional device 40. The joint sleeve 30 is also sleeved with a bearing B4, which is adjacent to the second transmission gear 35. The outer edges of the bearings B3 and B4 are in contact with the first housing 11 and the second housing 12 (as shown in FIG. 3 ).

Through the structural design of the power output mechanism 1 of the embodiment, when it is necessary to use the motor 70 to output auxiliary power, for example, when the pedaling force detected by the pedaling force detector 51 is higher than a preset value, the motor 70 can be driven so that The motor 70 rotates the combined force sleeve 30 via the speed reducer and the second transmission motor 70 on the combined force sleeve 30, and then outputs auxiliary power to help the rider ride the bicycle. On the other hand, in terms of spatial arrangement, in this embodiment, the power input portion 33 of the resultant sleeve 30 is provided close to the gear R, so various components of power output (such as the gear R and the motor 70) are involved Both are close to each other, which can effectively shorten the transmission path of the auxiliary power, so that the auxiliary power can be transmitted to the gear R quickly and with low loss. Furthermore, this embodiment also makes all the components involved in the detection signal (such as the pedal force detector 51 and the rotation speed detector 52) close to each other, and can also be less vulnerable to other components in signal detection Interference, so it can detect more accurate signals of pedaling force and speed.

The embodiments listed in the above paragraphs are used to clarify the possible implementation forms of this creative embodiment. This creation is not limited to the implementation forms exemplified above. Anything within the scope of the ideas disclosed in this creation should be made a little Retouching and changes should still be within the scope of this creation.

Prior art 2‧‧‧Drive parts 4‧‧‧Strain sensor 7‧‧‧Speed detection unit 11‧‧‧Crankshaft Examples 1‧‧‧Power output mechanism 10‧‧‧Housing 11‧‧‧First shell 12‧‧‧Second shell 13‧‧‧Shaft hole 20‧‧‧Crankshaft 30‧‧‧Heli sleeve 31‧‧‧Ring Department 32‧‧‧Detection Department 33‧‧‧Power input 34‧‧‧Sprocket connection 35‧‧‧Second transmission gear 351‧‧‧Inner ring gear 40‧‧‧The first unidirectional device 50‧‧‧detection unit 51‧‧‧Treading force detector 52‧‧‧Speed detector 53‧‧‧coil 54‧‧‧ circuit board 60‧‧‧ Components under test 70‧‧‧Motor 71‧‧‧ output shaft 72‧‧‧Reducer 73‧‧‧First gear 74‧‧‧spindle 75‧‧‧Second Unidirectional Device 76‧‧‧ First transmission gear 77‧‧‧ First transmission gear 78‧‧‧Rotor 79‧‧‧ Stator C‧‧‧Crank R‧‧‧Sprocket R1‧‧‧Inner ring gear B1-B4‧‧‧bearing

The detailed structure, characteristics, assembly or use of the power output mechanism of the electric assist bicycle will be described in the following embodiments, however, it should be understood that the embodiments and drawings to be described below are only for illustrative purposes. , It should not be used to limit the scope of patent applications for this creation, including:

FIG. 1 is a perspective view of a power output mechanism of this creative embodiment; Figure 2 is a partially exploded view of Figure 1; Figure 3 is a cross-sectional view of Figure 1; and FIG. 4 is a partial perspective view of the power output mechanism of the embodiment, which hides the motor and the housing; and FIG. 5 is a cross-sectional view of FIG. 4 taken along line 5-5.

1‧‧‧Power output mechanism

10‧‧‧Housing

11‧‧‧First shell

12‧‧‧Second shell

20‧‧‧Crankshaft

70‧‧‧Motor

C‧‧‧Crank

R‧‧‧Sprocket

Claims (7)

A power output mechanism of an electric power-assisted bicycle includes: A shell A crank shaft is rotatably installed in the casing; A combined force sleeve is rotatably sleeved outside the crank shaft. The combined force sleeve has a sprocket connection part, a power input part and a detection part. The power input part is provided on the sprocket connection part and the Between detection departments; A first unidirectional device, arranged between the crank shaft and the resultant sleeve; A detection unit has a pedaling force detector and a rotation speed detector, the pedaling force detector is provided in the detection part, the rotation speed detector is provided in the resultant force sleeve, and the rotation speed detector is relative Close to the detection part and relatively away from the gear wheel connection part; A device under test fixed to the crankshaft, wherein the speed detector can detect the rotation of the device under test to obtain the speed of the crankshaft; A motor is provided in the housing and connected to the power input portion. The motor can be driven to rotate the resultant sleeve through the power input portion. The power output mechanism of the electric power-assisted bicycle as described in claim 1 further includes a chainring, which is coaxially sleeved with the resultant sleeve and connected to the chainring connection portion. The power output mechanism of an electric power-assisted bicycle as described in claim 1, wherein the rotation speed detector is a Hall sensor, and the measured element is a magnetic element. The power output mechanism of an electric power-assisted bicycle according to claim 1, wherein the pedal force detector is a strain gauge. The power output mechanism of the electric power-assisted bicycle according to claim 1, wherein the detection part is located between the rotation speed detector and the power input part. The power output mechanism of the electric power-assisted bicycle according to claim 1, wherein the motor has a speed reducer, the motor rotates the resultant force sleeve through the speed reducer and the power input portion, and when the motor is not When driving, the reducer is in an idling state. The power output mechanism of the electric assist bicycle according to claim 6, wherein the motor has an output shaft, the output shaft is sleeved with a first gear, and the speed reducer includes a rotating shaft, a second unidirectional device, a The second gear and a first transmission gear, the rotating shaft is provided in the housing, the second gear is coaxially sleeved with the rotating shaft through the second unidirectional device, and the second gear meshes with the first gear, the first A transmission gear is coaxially sleeved on the rotating shaft, and the power output mechanism further includes a second transmission gear. The second transmission gear is disposed at the power input portion of the resultant sleeve and meshes with the first transmission gear.

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