Middle shaft structure of electric power-assisted bicycle

Abstract

The utility model discloses a centre shaft structure of an electric power-assisted bicycle, which comprises a centre shaft, a shaft sleeve and a magnetic sensor, the middle of the centre shaft is provided with a sensing signal center, a mounting part is annularly provided with a fixing ring, the fixing ring is provided with a plurality of fixing grooves in a surrounding manner, and magnetic elements are correspondingly arranged in the fixing grooves; bearings are arranged at the two ends of the shaft sleeve, an induction signal center is arranged in the middle of the shaft sleeve, the shaft sleeve is arranged outside the middle shaft, the two ends of the middle shaft penetrate through the bearings, the induction signal center corresponds to the mounting part, and an induction window corresponding to the magnetic element is formed in the mounting part; the induction signal pivot assembly is correspondingly arranged outside the induction signal pivot in a surrounding mode, and a magnetic induction element is arranged at the position, corresponding to the induction window, of the inner side of the induction signal pivot assembly. Therefore, the structure of the center shaft can be more compact, the rotating speed of the center shaft can be sensed, and the strategy of auxiliary power output of the motor can be adjusted.

Description

Technical Field

[0001] The utility model relates to the field of electric power-assisted bicycles, in particular to a central axis structure of an electric power-assisted bicycle. Background Art

[0002] Electric-assisted bicycles are different from general electric bicycles. Electric-assisted bicycles mainly use motors to assist the rider's pedaling power to reduce the burden on the rider's legs when riding. Therefore, during the riding process of electric-assisted bicycles, the power output of the motor needs to be controlled according to the speed of the vehicle, so as to achieve the effect of assisting riding.

[0003] In the prior art, the speed sensing components of electric assisted bicycles are mostly arranged on the outside of the shaft sleeve of the middle shaft. However, in the existing structure, the speed sensing components cannot be miniaturized due to structural reasons, the installation of the whole vehicle is relatively complicated, and it is not beautiful enough. Therefore, the applicant has improved the existing middle shaft to combine the middle shaft with sensing and signal transmission. Utility Model Content

[0004] Based on the above existing problems, this article introduces a middle axis structure of an electric assisted bicycle, aiming to solve the problem that the speed-sensitive middle axis structure of the existing electric assisted bicycle is not compact and unsightly.

[0005] The utility model proposes a central axis structure of an electric power-assisted bicycle, wherein the central axis is arranged on the five-way joint of the electric power-assisted bicycle and is connected to the left and right cranks, and the central axis structure comprises a central axis, a shaft sleeve and an induction signal central component, wherein a mounting portion is arranged in the middle of the central axis, a fixing ring is arranged around the mounting portion, a plurality of fixing grooves are arranged around the fixing ring, and magnetic elements are arranged in the fixing grooves correspondingly; bearings are arranged at both ends of the shaft sleeve, and an induction signal central component is arranged in the middle of the shaft sleeve, the shaft sleeve is sleeved outside the central axis, so that the two ends of the central axis are penetrated by the bearings, and the induction signal central component is arranged corresponding to the mounting portion, and an induction window is opened on the mounting portion corresponding to the magnetic element; the induction signal central component is arranged correspondingly around the outside of the induction signal central component, and a magnetic induction element is arranged at a position corresponding to the induction window on the inner side of the induction signal central component.

[0006] Preferably, it further comprises a strain sensing component, and the strain sensing component is arranged inside the magnetic element.

[0007] Preferably, the strain sensing component includes a strain gauge and a strain signal transmission line, and the strain signal transmission line is connected to the strain gauge signal to transmit the strain signal sensed by the strain gauge.

[0008] Preferably, the induction signal hub component also includes a magnetic induction signal transmission line, and the magnetic induction signal transmission line is connected to the magnetic induction element signal.

[0009] Preferably, the diameters at both ends of the central axis are larger than the diameter of the mounting portion.

[0010] Preferably, the diameters of both ends of the sleeve are larger than the diameter of the sensing signal hub.

[0011] Preferably, the sensing signal hub assembly includes two semicircular ring portions, and the two ring portions are combined to surround the sensing signal hub.

[0012] Preferably, there is a gap between the magnetic sensing element and the sensing window.

[0013] Compared with the prior art, this application has the following beneficial effects:

[0014] An installation part is provided in the middle position of the middle shaft, and a magnetic element is provided on the installation part. Through the sensing window of the sensing signal central component on the shaft sleeve and the rotation of the middle shaft, the chip on the sensing signal central component can obtain the change of the magnetism of the magnetic sensing element, and convert the magnetic signal into an analog signal, which is then sent to the whole vehicle controller. The whole vehicle controller converts it into a digital signal and sends it to the display component, so that the rider can obtain the speed signal. The rider can reduce or increase the pedaling frequency according to the actual speed to achieve the rider's satisfaction with the speed or riding feeling.

[0015] Compared with the prior art, the central axis structure of the utility model is more compact, the arrangement is more reasonable, and it is also convenient for installing other parts of the electric power-assisted bicycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a schematic diagram of the central axis structure of the utility model.

[0018] Figure 2 It is an exploded view of the central axis structure of the utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the sensing signal central component of the utility model.

[0020] The main figures in this application are:

[0021] 1 Center axis

[0022] 11 Installation

[0023] 12 Fixing ring

[0024] 13 Magnetic components

[0025] 2 Bushing

[0026] 20 Bearings

[0027] 21 Sensor Signal Center

[0028] 22 Sensing Window

[0029] 3. Sensor signal center component

[0030] 31 Magnetic induction element

[0031] 32 Magnetic induction signal transmission line

[0032] 33 Ring

[0033] 4 Strain Sensing Components DETAILED DESCRIPTION

[0034] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0035] In the following description, with reference to the accompanying drawings, several embodiments of the present application are described. It should be understood that other embodiments may also be used, and mechanical composition, structure, electrical and operational changes may be made without departing from the spirit and scope of the present disclosure. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present application is limited only by the claims of the published patents. The terms used here are only to describe specific embodiments and are not intended to limit the present application. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0036] Although the terms first, second, etc. are used to describe various elements or parameters in this article in some instances, these elements or parameters should not be limited by these terms. These terms are only used to distinguish one or parameter part from another or parameter. For example, the first end can be referred to as the second end, and similarly, the second end can be referred to as the first end, without departing from the scope of the various described embodiments. The first end and the second end are both describing one end, but unless the context clearly indicates otherwise, they are not the same end. Similar situations also include the first rotating shaft group and the second rotating shaft group, or the first shaft connection portion and the second shaft connection portion.

[0037] Furthermore, as used in this article, the singular forms "one", "an" and "the" are intended to include plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way.

[0038] The present application proposes a middle shaft structure of an electric power-assisted bicycle, wherein the middle shaft is arranged on the five-way bracket of the electric power-assisted bicycle and is connected to the left and right cranks. When the rider steps on the crank pedals, the middle shaft is driven to rotate, and at the same time drives the gear plate to rotate, thereby transmitting force to the driving wheel.

[0039] Please refer to Figure 1 and Figure 2 In the utility model, the central axis structure includes a central axis 1, a sleeve 2 and an induction signal central component 3. The central axis 1 has a mounting portion 11 in the middle. The mounting portion 11 is surrounded by a fixing ring 12. The fixing ring 12 is surrounded by a plurality of fixing grooves. A magnetic element 13 is correspondingly arranged in the fixing groove. The magnetic element 13 can be a magnetic material such as a magnet or magnetic steel. Bearings 20 are arranged at both ends of the sleeve 2, and an induction signal central component 21 is arranged in the middle of the sleeve 2. The sleeve 2 is sleeved outside the central axis 1 so that both ends of the central axis 1 are passed through the bearings 20, and the induction signal central component 21 is arranged corresponding to the mounting portion 11. A sensing window 22 is opened on the mounting portion 11 corresponding to the magnetic element 13. The induction signal central component 3 is correspondingly arranged outside the induction signal central component 21, and a magnetic induction element 31 is arranged at the position corresponding to the sensing window 22 on the inner side of the induction signal central component 3. At the same time, there is a gap between the magnetic induction element 31 and the sensing window 22.

[0040] Please refer to Figure 3 The induction signal hub component 3 also includes a magnetic induction signal transmission line 32 and two semicircular rings 33. The magnetic induction signal transmission line 32 is connected to the magnetic induction element 21 for signal connection. The two rings 33 are combined to surround the induction signal hub 21.

[0041] In the present embodiment, the diameters at both ends of the central axis 1 are larger than the diameter of the mounting portion 11, and the diameters at both ends of the sleeve 2 are larger than the diameter of the sensing signal hub 21, which means that in the present embodiment, the central axis 1 and the sleeve 2 are in an "I" shape, and the recessed portions in the middle are the mounting portion 11 and the sensing signal hub 21, respectively. Thus, when the sensing signal hub component 3 is installed outside the sensing signal hub 21 of the sleeve 2, the sensing signal hub component 3 can be just embedded in the recessed portion of the sleeve 2, so that the outer edge of the sensing signal hub component 3 is basically flush with the two ends of the sleeve 2, thereby making the overall central axis structure more compact.

[0042] In another embodiment of the utility model, a strain sensing component 4 can be added, and the strain sensing component includes a strain gauge and a strain signal transmission line, and the strain signal transmission line is connected to the strain gauge signal to transmit the strain signal sensed by the strain gauge. By adding the strain sensing component 4, when the rider steps on the vehicle pedal, the pedaling force applied to the pedal and crank will cause the strain gauge to deform, and the strain gauge senses the strain data through the deformation, which can be converted into riding torque data.

[0043] The strain signal can be collected together with the magnetic induction signal and then transmitted to the vehicle controller for signal analysis, thereby obtaining the vehicle speed data and pedaling torque data at the same time.

[0044] In use, when the rider steps on the crank pedal of the electric assisted bicycle, the middle axis 1 is driven to rotate, and the magnetic element 13 of the middle axis 1 will periodically pass through the sensing window 22. When the magnetic element 13 passes through the sensing window 22, the magnetic sensing element 31 corresponding to the sensing window 22 will sense the magnetic element 13. The chip on the sensing signal center 3 can obtain the change in the magnetism of the magnetic sensing element 31. At the same time, the strain sensing component 4 on the middle axis 1 will also obtain the strain signal of the rider stepping on the pedal, and transmit the strain signal to the sensing signal center 3. The sensing signal center 3 converts the magnetic signal and the strain signal into analog signals, and then sends them to the vehicle controller. The vehicle controller converts them into digital signals and sends them to the display component, so that the rider can obtain the speed data and torque data. The rider needs to reduce or increase the pedaling frequency and pedaling force according to the actual speed to achieve the rider's satisfaction with the speed or riding feeling.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A middle axis structure of an electric power-assisted bicycle, wherein the middle axis is arranged on the bottom bracket of the electric power-assisted bicycle and connected to the left and right cranks, characterized in that: Including the central shaft, sleeve and induction signal central assembly, The middle of the central axis has a mounting portion, the mounting portion is surrounded by a fixing ring, the fixing ring is surrounded by a plurality of fixing grooves, and the fixing grooves are correspondingly provided with magnetic elements; The two ends of the sleeve are provided with bearings, and the middle of the sleeve has an induction signal hub, the sleeve is sleeved outside the central shaft, so that the two ends of the central shaft are passed through the bearings, and the induction signal hub is arranged corresponding to the mounting part, and the mounting part has an induction window corresponding to the magnetic element; The sensing signal central component is correspondingly arranged outside the sensing signal hub, and a magnetic sensing element is arranged at a position corresponding to the sensing window on the inner side of the sensing signal central component.

2. The middle axis structure of an electric-assisted bicycle according to claim 1, characterized in that: It further includes a strain sensing component, which is disposed inside the magnetic element.

3. The middle axis structure of an electric power-assisted bicycle according to claim 2, characterized in that: The strain sensing component includes a strain gauge and a strain signal transmission line. The strain signal transmission line is connected to the strain gauge signal to transmit the strain signal sensed by the strain gauge.

4. The middle axis structure of an electric-assisted bicycle according to claim 1, characterized in that: The induction signal hub component also includes a magnetic induction signal transmission line, and the magnetic induction signal transmission line is connected to the magnetic induction element signal.

5. The middle axis structure of an electric-assisted bicycle according to claim 1, characterized in that: The diameters of the two ends of the central axis are larger than the diameter of the mounting portion.

6. The middle axis structure of an electric-assisted bicycle according to claim 1, characterized in that: The diameters of the two ends of the shaft sleeve are larger than the diameter of the sensing signal hub.

7. The middle shaft structure of an electric-assisted bicycle according to claim 1, characterized in that: The sensing signal hub component includes two semicircular ring parts, and the two ring parts are combined to surround the sensing signal hub.

8. The middle shaft structure of an electric-assisted bicycle according to claim 1, characterized in that: There is a gap between the magnetic sensing element and the sensing window.

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