Electric moped center shaft torque sensor structure device

Abstract

The utility model relates to the technical field of sensor fixing structures, in particular to an electric moped middle shaft torque sensor structure device, which is characterized in that an annular boss is arranged on the outer side of a shaft roller, and an anti-falling buckle is detachably connected to the outer side of a sensor assembly; an annular empty groove is formed in one end, facing the annular boss, of the anti-disengaging buckle and one end, facing the annular boss, of the sensor assembly, and after the sensor assembly and the anti-disengaging buckle are assembled to the outer side of the shaft roller and connected, the annular empty groove formed by the sensor assembly and the anti-disengaging buckle is arranged on the outer side of the annular boss in a sleeving mode to form axial locking on the shaft roller. The anti-falling buckle is fixed on the outer side of the sensor assembly in a threaded mode, the anti-falling buckle and the shaft stick are fixed, a clamping spring groove does not need to be formed in the outer side end of the shaft stick to assemble the clamping spring, the thickness of the side wall of the shaft stick cannot be reduced through the assembling mode, and therefore the overall strength of the shaft stick can be improved, and the service life of the shaft stick is prolonged. The axial displacement of the sensor assembly is not caused even if a whole vehicle right-falling test is carried out for many times.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor fixing structures, in particular to a central shaft torque sensor structure device for an electric power-assisted bicycle. Background Art

[0002] With the rapid development of intelligent electric bicycles, torque sensors will gradually become the mainstream choice of people, which puts higher requirements on the simple assembly and cost-effectiveness of torque sensors.

[0003] In the prior art, there is a Chinese utility model patent with announcement number CN220912518U, and the patent name is "A central shaft torque sensor structure device for an electric power-assisted bicycle". It specifically discloses a shaft and a left bowl and a right bowl arranged on both sides of the shaft, and also includes a sensor assembly arranged between the left bowl and the right bowl. The sensor assembly is coaxially assembled on the shaft, and a first anti-rotation portion is provided at the outer end of the sensor assembly, and a second anti-rotation portion is provided on the inner side of the right bowl. The first anti-rotation portion and the second anti-rotation portion cooperate with each other to prevent the sensor assembly from rotating.

[0004] The above solution integrates sensors with different functions into an independent component, the sensor assembly. During actual production and assembly, only the sensor assembly needs to be processed uniformly. The production and assembly efficiency will not be affected by the size of the shaft, and it is suitable for batch automated production operations.

[0005] However, in actual use, the fixation between the sensor assembly and the shaft in the CN220912518U solution is to set a retaining spring on the shaft to limit the position of the sensor assembly, which has two serious problems:

[0006] 1. First, the shaft in the above scheme is provided with M8 screw holes on both sides of the end face (M8 screw holes are industry standard configuration). In order to fix the sensor assembly located on the outside of the shaft, a retaining spring groove for placing a retaining spring is usually provided on the outer end face of the shaft. The retaining spring groove overlaps with the M8 screw hole axially, which will cause the thickness between the retaining spring groove and the screw hole to become smaller, which will seriously affect the strength of both ends of the shaft (fatigue test easily breaks at the retaining spring position).

[0007] 2. When the sensor is assembled on the whole vehicle for the right-side drop test (this is a special requirement for some customer models, especially shared bicycles, which have a high risk of side falls, such as: human side falls, being blown down by the wind, etc.), the retaining strength of the retaining spring is limited. During the test, the retaining spring easily falls out of the retaining spring groove, which is far from meeting the customer's usage requirements. Therefore, it is necessary to improve the above structure.

[0008] Therefore, a central shaft torque sensor structure device for an electric power-assisted bicycle is proposed to solve the above-mentioned problems. Utility Model Content

[0009] Technical problems solved

[0010] In view of the above-mentioned shortcomings of the prior art, the present invention provides a central axle torque sensor structure device for an electric power-assisted bicycle, which can effectively solve the problem in the prior art that the assembly method of the sensor component affects the fatigue strength of the axle rod.

[0011] Technical Solution

[0012] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0013] The utility model provides a central shaft torque sensor structure device for an electric power-assisted bicycle, comprising a shaft stick and a left bowl piece and a right bowl piece cooperatively mounted on both sides of the shaft stick, and also comprising a sensor assembly coaxially sleeved on the outside of the shaft stick, an annular boss being provided on the outside of the shaft stick, an anti-detachment buckle being detachably connected to the outside of the sensor assembly, an annular hollow groove being formed by the anti-detachment buckle and the sensor assembly facing one end of the annular boss, and when the sensor assembly and the anti-detachment buckle are assembled to the outside of the shaft stick and connected, the annular hollow groove formed by the two is sleeved on the outside of the annular boss to form axial locking for the shaft stick.

[0014] Furthermore, the inner end surface of the anti-drop buckle is matched with the outer end surface of the sensor assembly through a thread.

[0015] Furthermore, a retaining spring is sleeved on the outer side of the shaft, and the retaining spring is arranged on one side of the anti-dropping buckle and is used to limit the axial movement of the anti-dropping buckle.

[0016] Furthermore, a retaining spring position for assembling a retaining spring is provided on the outer side of the shaft.

[0017] Furthermore, at least one rotation stop is provided on the outer end surface of the anti-drop buckle.

[0018] Beneficial effects

[0019] Compared with the known public technologies, the technical solution provided by this utility model has the following beneficial effects:

[0020] The utility model fixes an anti-drop buckle on the outer side thread of the sensor assembly, and utilizes the fixation between the anti-drop buckle and the shaft rod, so there is no need to open a retaining spring groove on the outer end of the shaft rod to assemble the retaining spring. This assembly method does not reduce the thickness of the side wall of the shaft rod, thereby improving the overall strength of the shaft rod, and even if the whole vehicle is dropped to the right multiple times, it will not cause axial displacement of the sensor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the sensor in the embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the assembly structure of the left and right bowl parts in the embodiment of the present utility model;

[0024] Figure 3 This is a front view schematic diagram of the shaft structure in the embodiment of the present utility model;

[0025] Figure 4 In the embodiment of the present utility model Figure 3 Schematic diagram of the structure at A in the middle;

[0026] Figure 5 This is a front cross-sectional schematic diagram of the main structure in an embodiment of the utility model;

[0027] Figure 6 It is a front cross-sectional schematic diagram of the sensor assembly in an embodiment of the present utility model.

[0028] The numbers in the figure represent: 1, shaft; 10, retaining spring position; 11, annular boss; 12, retaining spring; 2, left bowl piece; 3, right bowl piece; 4, sensor assembly; 41, anti-drop buckle; 411, annular groove; 412, anti-rotation position. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above, obliquely above, or on the surface of the second feature, the second feature being supported and fixed by the first feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0033] The present invention will be further described below with reference to the embodiments.

[0034] Example:

[0035] Refer to the attached Figure 1-6 This embodiment proposes a central axle torque sensor structure device for an electric power-assisted bicycle, which mainly includes a shaft rod 1 and a left bowl member 2 and a right bowl member 3 mounted on both sides of the shaft rod 1.

[0036] The assembly method between the left and right bowls and the shaft rod 1 is a well-known technology and is not specifically limited here. M8 screw holes are provided inward on both side end surfaces of the shaft rod 1.

[0037] A sensor assembly 4 is sleeved on the outside of the shaft 1. In traditional technology, a retaining spring is set on both sides of the sensor assembly 4 to limit the axial displacement of the sensor assembly 4 on the shaft 1, so that a retaining spring groove is opened on the outside of the shaft 1. The retaining spring groove is usually opened on the outer end face of the shaft 1 and is located on the outside of the M8 screw hole. Therefore, the retaining spring groove reduces the thickness between the M8 screw hole wall and the outer end face of the shaft 1, thereby reducing the strength of the shaft 1.

[0038] In this case, the sensor assembly 4 coaxially sleeved on the outside of the shaft is fixed in another way, abandoning the fixing method of the retaining spring.

[0039] Specific reference attached Figure 4An annular boss 11 is coaxially provided on the outer side of the shaft 1, and an anti-detachment buckle 41 is detachably connected to the outer side of the sensor assembly 4. The cross-section of the anti-detachment buckle 41 is L-shaped, and the anti-detachment buckle 41 and the sensor assembly 4 form an annular groove 411 at one end facing the annular boss 11. When the sensor assembly 4 and the anti-detachment buckle 41 are assembled to the outer side of the shaft 1 and connected, the annular groove 411 formed by the two is sleeved on the outer side of the annular boss 11 to form axial locking of the shaft.

[0040] That is, the side of the sensor component 4 away from the M8 screw hole is fixed to the shaft rod 1 by the anti-drop buckle 41 and the sensor component 4 through threaded locking. There is no need to set a retaining spring on the outer end of the shaft rod 1, that is, the outside of the M8 screw hole to limit the sensor component 4 axially.

[0041] As attached Figure 4 As shown, the cross-section of the anti-slip buckle 41 is L-shaped, and the diameter of the notch step of the anti-slip buckle 41 is smaller than the outer diameter of the annular boss by a certain size. In this way, the annular boss 11 of the shaft rod is limited to the left by the notch step of the L-shaped anti-slip buckle 41, and is limited to the right by the sensor assembly 4. In this way, the annular boss 11 of the shaft rod is firmly fixed by forming an annular groove 411 at one end of the anti-slip buckle 41 and the sensor assembly 4 facing the annular boss 11.

[0042] In order to further improve the axial limiting effect of the anti-drop buckle 41, a retaining spring 12 is also sleeved on the outside of the shaft 1. The retaining spring 12 is arranged on one side of the anti-drop buckle 41 and is used to limit the axial movement of the anti-drop buckle 41. Since the retaining spring 12 is far away from the M8 screw hole, and a retaining spring position 10 for assembling the retaining spring 12 is provided on the outside of the shaft 1, the retaining spring position 10 will not affect the structural strength of the shaft 1.

[0043] In order to facilitate the rotation of the anti-slip buckle 41, in this case, at least one stop position 412 is provided on the outer end face of the anti-slip buckle 41. The stop position 412 can be in the form of a notch, anti-slip groove, protrusion, etc., which is convenient for manual or tool fixation and rotation of the anti-slip buckle 41. In this case, the stop position 412 on the outer end face of the anti-slip buckle 41 is two symmetrical planes set on the outer diameter, which can not only meet the requirements of the anti-slip buckle 41 for assembly and disassembly with tools, but also facilitate production and processing, saving costs.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A central axle torque sensor structure device for an electric power-assisted bicycle, comprising a shaft (1) and a left bowl (2) and a right bowl (3) mounted on both sides of the shaft (1), characterized in that: The invention also includes a sensor assembly (4) coaxially sleeved on the outside of the shaft, an annular boss (11) is provided on the outside of the shaft (1), and an anti-drop buckle (41) is detachably connected to the outside of the sensor assembly (4), and the anti-drop buckle (41) and the sensor assembly (4) form an annular hollow groove (411) at one end facing the annular boss (11). When the sensor assembly (4) and the anti-drop buckle (41) are assembled to the outside of the shaft (1) and connected, the annular hollow groove (411) formed by the two is sleeved on the outside of the annular boss (11) to form an axial locking of the shaft.

2. The electric power-assisted bicycle central axle torque sensor structure device according to claim 1, characterized in that: The inner end surface of the anti-drop buckle (41) is matched with the outer end surface of the sensor assembly (4) via a thread.

3. The electric power-assisted bicycle central axle torque sensor structure device according to claim 1, characterized in that: The outer side of the shaft rod (1) is covered with a retaining spring (12), which is arranged on one side of the anti-dropping buckle (41) and is used to limit the axial movement of the anti-dropping buckle (41).

4. The electric power-assisted bicycle central axle torque sensor structure device according to claim 3, characterized in that: A retaining spring position (10) for assembling a retaining spring (12) is provided on the outer side of the shaft rod (1).

5. The electric power-assisted bicycle central axle torque sensor structure device according to claim 1, characterized in that: At least one rotation stop (412) is provided on the outer end surface of the anti-drop buckle (41).

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