Middle shaft torque sensor and electric bicycle

Abstract

The invention discloses a center shaft torque sensor and an electric bicycle, and relates to the technical field of electric bicycles, and the center shaft torque sensor comprises a wiring mechanism, a first wrist guard and a sensor wire harness. The wiring mechanism connected to the frame five-way tube is arranged, the wiring mechanism is provided with the axial wiring channel located in the frame five-way tube and the radial wiring channel located outside the frame five-way tube, and the first wrist guard is located at one end of the frame five-way tube and connected to the wiring mechanism; the sensor wire harness is positioned and guided through the axial wiring channel and the radial wiring channel in sequence, so that the sensor wire harness can penetrate out of the end, facing the first wrist guard, of the frame five-way pipe, the procedure of trepanning of the frame five-way pipe is omitted, the sensor wire harness cannot be extruded when a vehicle is disassembled and assembled, and the risk that the sensor wire harness is broken is effectively reduced; and the assembly process is simplified, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric bicycles, and in particular to a central axis torque sensor and an electric bicycle. Background Art

[0002] The center axis torque sensor of the electric bicycle is installed on the five-way tube of the frame. In order to meet the wire outlet requirements of the sensor, it is necessary to drill a hole in the five-way tube of the frame. When installing the center axis torque sensor, in order to allow the wire harness to pass through the wire outlet hole of the five-way tube of the frame, not only is it necessary to blindly install the sensor when disassembling and assembling the vehicle, but it is also necessary to always pay attention to the condition of the wire harness to prevent the wire harness from being squeezed and broken. Therefore, high requirements are placed on the assembly technique, which affects production efficiency. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a mid-axle torque sensor, wherein the wiring harness is led out from the end of the five-way tube of the frame, which is convenient for disassembly and assembly of the vehicle, improves production efficiency, and prevents the wiring harness from being squeezed and broken.

[0004] The present invention also provides an electric bicycle having the above-mentioned middle shaft torque sensor.

[0005] According to an embodiment of the first aspect of the present invention, the bottom axle torque sensor is installed on a frame bottom tube, comprising: a wiring mechanism connected to the frame bottom tube, the wiring mechanism being provided with an axial wiring channel located inside the frame bottom tube and a radial wiring channel located outside the frame bottom tube; a first wrist guard connected to the wiring mechanism and located at one end of the frame bottom tube; a sensor harness is configured to pass from the frame bottom tube toward one end of the first wrist guard, and a partial structure of the sensor harness is arranged in the axial wiring channel and the radial wiring channel.

[0006] The central axis torque sensor according to the embodiment of the present invention has at least the following beneficial effects:

[0007] A wiring mechanism connected to the five-way tube of the frame is provided, the wiring mechanism is provided with an axial wiring channel located inside the five-way tube of the frame and a radial wiring channel located outside the five-way tube of the frame, the first wrist guard is located at one end of the five-way tube of the frame and is connected to the wiring mechanism, the sensor wiring harness is positioned and guided through the axial wiring channel and the radial wiring channel in sequence, so that the sensor wiring harness can pass from the five-way tube of the frame toward one end of the first wrist guard, the process of opening a hole in the five-way tube of the frame is reduced, the sensor wiring harness will not be squeezed when disassembling and assembling the vehicle, and the risk of the sensor wiring harness breaking is effectively reduced; and the assembly process is simplified, and the production efficiency is improved.

[0008] According to some embodiments of the present invention, the wiring mechanism includes a support sleeve and a wire fixing bracket, the support sleeve is connected to the inner wall of the frame five-way tube, the outer peripheral wall of the support sleeve is provided with a first opening, and the first opening is formed as the axial wiring channel; the wire fixing bracket is connected to the support sleeve and abuts against the end wall of the frame five-way tube, and the wire fixing bracket is provided with a second opening, and the second opening is formed as the radial wiring channel.

[0009] According to some embodiments of the present invention, the support sleeve includes a first positioning mechanism, and the wire fixing bracket includes a second positioning mechanism. The first positioning mechanism is connected to the second positioning mechanism and is configured to enable the support sleeve and the wire fixing bracket to move relative to each other in the axial direction of the support sleeve, and to limit the relative movement of the support sleeve and the wire fixing bracket in a direction perpendicular to the axial direction of the support sleeve.

[0010] According to some embodiments of the present invention, the support sleeve includes a connecting portion, the first positioning mechanism is at least one groove provided on the connecting portion, the wire fixing bracket includes an annular portion abutting against the five-way tube of the frame, and the second positioning mechanism is a first protrusion provided on the annular portion and positioned and matched with the groove.

[0011] According to some embodiments of the present invention, there are multiple first protrusions, and the multiple first protrusions are evenly distributed along the circumference of the wire fixing bracket. There are multiple grooves, and the multiple grooves are arranged in a one-to-one correspondence with the multiple first protrusions.

[0012] According to some embodiments of the present invention, a bottom wall of the second opening in the radial direction of the wire fixing bracket protrudes along the axial direction of the wire fixing bracket to form a second protrusion, and the second protrusion is connected to the first opening.

[0013] According to some embodiments of the present invention, the support sleeve includes an inner tube portion and an outer tube portion, the inner tube portion is connected to the first wrist guard, and the outer tube portion is connected to the five-way tube of the frame.

[0014] According to some embodiments of the present invention, the inner wall of the five-way tube of the frame is provided with a first internal thread, and the outer wall of the outer tube is provided with a first external thread matching the first internal thread.

[0015] According to some embodiments of the present invention, the central axis torque sensor also includes a central axis, the first wrist guard includes a sleeve portion for allowing the central axis to pass through, the sleeve portion is provided with a second external thread, and the inner wall of the inner cylinder portion is provided with a second internal thread matching the second external thread.

[0016] According to some embodiments of the present invention, the first wrist guard further includes a first mounting portion connected to the sleeve portion, a bearing mounting hole is provided in the first mounting portion, and the bearing mounting hole is communicated with the inner hole of the sleeve portion.

[0017] According to some embodiments of the present invention, a first end surface is provided at one end of the first mounting portion facing the sleeve portion, and the wire fixing bracket includes an annular portion, and a second end surface is provided at one end of the annular portion facing the first mounting portion, and the second end surface abuts against the first end surface.

[0018] According to some embodiments of the present invention, the annular portion is provided with a third end surface at one end facing the frame bottom bracket, the third end surface abuts against a fourth end surface of the frame bottom bracket, and the sensor harness passes through between the first end surface and the fourth end surface.

[0019] The electric bicycle according to the second embodiment of the present invention comprises a frame bottom bracket tube; the bottom bracket torque sensor described in the above embodiment is installed on the frame bottom bracket tube.

[0020] The electric bicycle according to the embodiment of the present invention has at least the following beneficial effects:

[0021] A center axle torque sensor of the first aspect of the embodiment is adopted, and the center axle torque sensor is connected to the frame five-way tube by setting a wiring mechanism, the wiring mechanism is provided with an axial wiring channel located inside the frame five-way tube and a radial wiring channel located outside the frame five-way tube, the first wrist guard is located at one end of the frame five-way tube and connected to the wiring mechanism, the sensor wiring harness is positioned and guided by the axial wiring channel and the radial wiring channel in sequence, so that the sensor wiring harness can pass from the frame five-way tube toward one end of the first wrist guard, reducing the process of opening a hole in the frame five-way tube, and the sensor wiring harness will not be squeezed when disassembling and assembling the vehicle, effectively reducing the risk of the sensor wiring harness breaking; and simplifying the assembly process and improving production efficiency.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 A structural cross-sectional view of a middle axle torque sensor according to an embodiment of the present invention installed on a five-way tube of a frame;

[0025] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0026] Figure 3 A structural stereogram of a center shaft torque sensor according to an embodiment of the present invention;

[0027] Figure 4 for Figure 3The enlarged view of point B in the middle;

[0028] Figure 5 for Figure 3 A three-dimensional diagram of the structure of the middle support sleeve;

[0029] Figure 6 for Figure 3 The structural stereogram of the middle fixed wire support;

[0030] Figure 7 for Figure 3 A three-dimensional diagram of the structure of the first wrist guard.

[0031] Figure Number:

[0032] Axle torque sensor 1000; frame bottom bracket 2000; first internal thread 2100; fourth end face 2200;

[0033] Center axis 100;

[0034] Routing mechanism 200; support sleeve 210; connecting portion 211; groove 2111; inner cylinder portion 212; second inner thread 2121; outer cylinder portion 213; first outer thread 2131; wire fixing bracket 220; annular portion 221; second end surface 2211; third end surface 2212; first protrusion 222; second protrusion 223; first opening 230; second opening 240;

[0035] Sensor harness 300;

[0036] First wrist guard 400; sleeve portion 410; second external thread 411; first mounting portion 420; bearing mounting hole 421; slot 422; snap ring 423; first end surface 424;

[0037] Second wrist guard 500;

[0038] Axial wiring channel 600;

[0039] Radial wiring channel 700. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0043] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0044] The middle shaft torque sensor is a sensing device installed on the electric bicycle. The middle shaft torque sensor is used to monitor the changes in the user's pedal torque during riding, thereby transmitting the torque change signal to the processor, and the processor controls the drive device of the electric bicycle to provide assistance.

[0045] The middle axle torque sensor 1000 of the embodiment of the present invention is generally installed on the frame of the electric bicycle, specifically installed on the frame five-way tube 2000. The middle axle torque sensor 1000 includes a middle axle 100, which is passed through the frame five-way tube 2000, and a sensor body is installed on the middle axle 100, and the sensor body is located inside the frame five-way tube 2000. In the related art, in order to enable the electrical signal of the sensor body to be transmitted to the processor, a sensor harness 300 transmission method is usually adopted. However, in order to enable the sensor harness 300 to be led out of the frame five-way tube 2000 and inserted into the processor, it is necessary to open a wire outlet hole on the frame five-way tube 2000 so that the sensor harness 300 passes through the wire outlet hole and passes out of the frame five-way tube 2000.

[0046] When installing the mid-axle torque sensor 1000, due to the limited radial space inside the frame five-way tube 2000, the wire outlet is set on the radial circumferential wall, which has strict requirements on the radial size of the sensor. In order to allow the wiring harness to pass through the wire outlet hole, when disassembling and assembling the vehicle, not only is it necessary to blindly install the sensor body, but it is also necessary to always pay attention to the condition of the wiring harness to prevent the wiring harness from being squeezed and broken. Therefore, high requirements are placed on the assembly technique, which affects production efficiency.

[0047] In order to solve the technical problem of difficult assembly of the traditional middle shaft torque sensor 1000, the middle shaft torque sensor 1000 of the embodiment of the present invention adopts the outlet of the end of the frame bottom bracket 2000, which reduces the process of drilling holes on the frame bottom bracket 2000. The solution of the present invention is introduced through the following embodiments.

[0048] Reference Figure 1 and Figure 2 As shown in FIG. 1 , a central axis torque sensor 1000 according to an embodiment of the present invention includes a wiring mechanism 200, a first wrist guard 400, and a second wrist guard 500. The first wrist guard 400 and the second wrist guard 500 are respectively installed at the left and right ends of the frame bottom bracket 2000. Figure 1 Taking the left and right directions as an example, it can be seen that the inner wall of the frame bottom tube 2000 near the left port is provided with a first internal thread 2100, and the inner wall of the frame bottom tube 2000 near the right port is also provided with a first internal thread 2100. The wiring mechanism 200 is threadedly connected to the left end of the frame bottom tube 2000, and the first wrist guard 400 is connected to the wiring mechanism 200. The first wrist guard 400 is connected to the wiring mechanism 200, so that the first wrist guard 400, the wiring mechanism 200 and the frame bottom tube 2000 are pressed tightly, effectively inhibiting pollutants from entering from the left port of the frame bottom tube 2000, and more stable installation can be achieved. The second wrist guard 500 is threadedly connected to the right end of the frame bottom tube 2000, effectively inhibiting pollutants from entering from the right port of the frame bottom tube 2000. The first wrist guard 400 and the second wrist guard 500 are both provided with bearings, the middle shaft 100 is passed through the frame bottom bracket 2000, and the middle shaft 100 is supported by the first wrist guard 400 and the second wrist guard 500 through bearings. As another embodiment, the frame bottom bracket 2000 can also be connected to the middle shaft torque sensor 1000 in other detachable connection ways, thereby replacing the threaded connection way.

[0049] It is understandable that if the middle shaft torque sensor 1000 and the frame bottom bracket 2000 are designed with the same lifespan, the frame bottom bracket 2000 can also be connected to the middle shaft torque sensor 1000 in a non-detachable manner such as interference fit.

[0050] Reference Figure 3 and Figure 4 As shown, the wiring mechanism 200 of the embodiment of the present invention is connected to the frame bottom bracket 2000, part of the wiring mechanism 200 is located inside the frame bottom bracket 2000, and the other part of the wiring mechanism 200 is located outside the frame bottom bracket 2000. The wiring mechanism 200 can be an integrally formed structure or can be assembled from two or more parts, and the specific structure is not limited here.

[0051] The structure located in the frame bottom bracket 2000 is provided with an axial wiring channel 600, and the axial wiring channel 600 can be a structure such as a slot or a through hole to accommodate the sensor harness 300. It should be noted that the axial wiring channel 600 should be understood as the overall wiring trend along the axis direction of the frame bottom bracket 2000 (i.e. Figure 3 The axial wiring channel 600 is a straight channel, which is arranged parallel to the axis of the frame bottom bracket 2000, or arranged to be inclined to the axis of the frame bottom bracket 2000. Alternatively, the axial wiring channel 600 can also be an arc channel or composed of multiple sections of channels.

[0052] The structure outside the frame bottom bracket tube 2000 is provided with a radial wiring channel 700. It should be noted that the radial wiring channel 700 should be understood as a wiring channel whose overall wiring trend is along the radial direction of the frame bottom bracket tube 2000 (i.e., the direction perpendicular to the axis of the frame bottom bracket tube 2000). The radial wiring channel 700 can be a structure such as a slot or a through hole to accommodate the sensor harness 300. The radial wiring channel 700 is a straight channel, which is set perpendicular to the axis of the frame bottom bracket tube 2000, or is set to be inclined to the axis of the frame bottom bracket tube 2000. As an alternative, the radial wiring channel 700 can also be an arc channel or composed of multiple sections of channels.

[0053] The sensor harness 300 is led out from the sensor body, and is positioned along the axis direction of the frame five-way tube 2000 through the axial wiring channel 600, and then is positioned along the radial direction of the frame five-way tube 2000 through the radial wiring channel 700, and finally passes through the assembly structure of the middle axis torque sensor 1000 and the frame five-way tube 2000. The embodiment of the present invention guides the sensor harness 300 to pass from the frame five-way tube 2000 toward the port of the first wrist guard 400, which makes wiring more convenient, reduces the process of opening holes in the frame five-way tube 2000, avoids the influence of the position error and aperture error of the outlet hole of the frame five-way tube 2000, and improves the frame adaptation rate; the sensor harness 300 will not be squeezed when disassembling and assembling the vehicle, effectively reducing the risk of the sensor harness 300 being squeezed and broken; and simplifies the assembly process and improves production efficiency. In addition, since the solution of opening a hole in the frame bottom bracket tube 2000 requires reserving a perforation space for the sensor harness 300 in the frame bottom bracket tube 2000, the outer diameter of the sensor body is limited, while the embodiment of the present invention does not require reserving a perforation space, and therefore the layout of the middle shaft torque sensor 1000 in the frame bottom bracket tube 2000 can be optimized, the radial size of the sensor body can be increased, and the performance of the middle shaft torque sensor 1000 can be improved.

[0054] Reference Figure 3 and Figure 6As shown, in order to achieve adjustable outlet position of sensor harness 300, the wiring mechanism 200 of the embodiment of the present invention includes a support sleeve 210 and a wire fixing bracket 220. The support sleeve 210 is connected to the inner wall of the frame five-way tube 2000, and the outer peripheral wall of the support sleeve 210 is provided with a first external thread 2131, and the first external thread 2131 matches the first internal thread 2100 of the inner wall of the frame five-way tube 2000, so that the support sleeve 210 can be installed in the frame five-way tube 2000. The outer peripheral wall of the support sleeve 210 is provided with a first opening 230, and the first opening 230 is a groove body or through-hole structure formed by being recessed inward relative to the outer peripheral wall of the support sleeve 210, and the first opening 230 extends along the axial direction of the frame five-way tube 2000 and passes through both ends of the support sleeve 210. The first opening 230 is formed as an axial wiring channel 600. The first opening 230 and the inner wall of the frame bottom bracket 2000 can effectively position the sensor harness 300, and the sensor harness 300 is built into the support sleeve 210, so that the sensor harness 300 is not easy to interfere with the inner wall of the frame bottom bracket 2000 during the disassembly and assembly of the middle bracket 100, thereby preventing the sensor harness 300 from being squeezed and broken.

[0055] Reference Figure 3 and Figure 5 As shown, the wire bracket 220 is connected to the support sleeve 210. The wire bracket 220 can be fixedly connected to the support sleeve 210, for example, by screwing, clamping, bonding, etc., or it can abut against the support sleeve 210 and be indirectly fixed through the first wrist guard 400 or other structures. The wire bracket 220 abuts against the left end wall of the frame five-way tube 2000. The wire bracket 220 is provided with a second opening 240. The second opening 240 is located on the outer peripheral wall of the wire bracket 220. The second opening 240 is a groove body formed by being recessed toward the center of the wire bracket 220 relative to the outer peripheral wall of the wire bracket 220. The side of the groove body close to the center of the wire bracket 220 is connected to the first opening 230. The second opening 240 is formed as a radial wiring channel 700. The second opening 240 and the left end wall of the frame five-way tube 2000 can effectively position the sensor harness 300, and make the sensor harness 300 built into the wire bracket 220. The sensor harness 300 is led out through the end of the second opening 240 , and therefore does not need to pass through the wire outlet hole of the tube wall of the frame bottom bracket 2000 .

[0056] It is understandable that, referring to Figure 6 As shown, the second opening 240 is a structure that penetrates in the left-right direction, so in order to make the sensor harness 300 more stably positioned, it is necessary to limit the left end of the second opening 240 through the end surface of the first wrist guard 400. As an alternative, the left end of the second opening 240 can be provided with an end wall, and the end wall cooperates with the left end wall of the frame bottom bracket 2000 to limit the left-right direction of the sensor harness 300.

[0057] The following is an introduction to an embodiment of a bicycle frame bottom bracket tube 2000 adopting an internal thread connection structure.

[0058] Reference Figure 2 and Figure 3 As shown, since it is necessary to consider the disassembly problem of the middle axis torque sensor 1000, to ensure that the middle axis torque sensor 1000 can be disassembled and assembled with the frame five-way tube 2000, the support sleeve 210 of the embodiment of the present invention is threadedly matched with the frame five-way tube 2000. When the support sleeve 210 is fixedly connected to the frame five-way tube 2000, the support sleeve 210 rotates the thread inside the frame five-way tube 2000 so that the first opening 230 can be rotated to a predetermined outlet position, that is, the first opening 230 can be rotated to any angular position on the circumference of the frame five-way tube 2000 through threaded matching. At this time, the wire fixing bracket 220 is connected to the support sleeve 210 according to the alignment requirements of the first opening 230 and the second opening 240, so that the sensor harness 300 can be outlet at any angular position on the circumference of the frame five-way tube 2000. Therefore, the matching structure of the support sleeve 210 and the wire fixing bracket 220 can achieve the fixation of the outlet position of the sensor harness 300 when the mid-axle torque sensor 1000 is installed on each frame, overcoming the problem that the outlet position cannot be fixed due to processing errors, etc., thereby improving assembly efficiency, enhancing assembly stability, and being able to adapt to different frames, thereby improving the versatility of components.

[0059] In order to facilitate the alignment of the second opening 240 of the wire fixing bracket 220 and the first opening 230 of the support sleeve 210, the central axis torque sensor 1000 of an embodiment of the present invention adopts a first positioning mechanism and a second positioning mechanism to achieve positioning. Figure 2 , Figure 5 and Figure 6 As shown, the support sleeve 210 includes a first positioning mechanism, and the wire fixing bracket 220 includes a second positioning mechanism. The first positioning mechanism is connected to the second positioning mechanism, and is used to limit the support sleeve 210 and the wire fixing bracket 220 to move relative to each other only in the axial direction of the support sleeve 210, but not in a direction perpendicular to the axial direction of the support sleeve 210. That is, after the support sleeve 210 and the frame five-way tube 2000 are connected, the wire fixing bracket 220 can be adjusted in the left and right directions according to the depth of the support sleeve 210 screwed into the frame five-way tube 2000 to ensure that it abuts against the left end wall of the frame five-way tube 2000. At the same time, the wire fixing bracket 220 is adjusted along the extension direction of the first opening 230 to keep the first opening 230 and the second opening 240 aligned, and will not affect the routing safety of the sensor harness 300; and the support sleeve 210 and the wire fixing bracket 220 are restricted from rotating or sliding relative to each other in the extension direction perpendicular to the first opening 230, so that the first opening 230 and the second opening 240 are not easily misaligned, thereby preventing the sensor harness 300 from being sheared and damaged.

[0060] Reference Figure 5 and Figure 6 As shown, it can be understood that the support sleeve 210 includes a connecting portion 211, and the first positioning mechanism is a groove 2111, and the groove 2111 is provided in the connecting portion 211, for example, provided in the outer peripheral wall of the connecting portion 211. The number of grooves 2111 can be designed according to actual needs, and is one or more. The wire fixing bracket 220 includes an annular portion 221, and the annular portion 221 abuts against the frame five-way tube 2000. The second opening 240 is formed in the annular portion 221. The second positioning mechanism is a first protrusion 222, and the first protrusion 222 is provided in the annular portion 221. The first protrusion 222 is positioned and matched with the groove 2111. The number of the first protrusion 222 is the same as the number of the groove 2111, and the position of the first protrusion 222 is also matched with the position of the groove 2111. Therefore, the operation of the support sleeve 210 and the wire fixing bracket 220 is more convenient during the alignment installation, and the limiting structure formed by the first positioning mechanism and the second positioning mechanism is stable, and the protection effect of the sensor harness 300 is good.

[0061] Reference Figure 5 and Figure 6 As shown, it can be understood that there are multiple first protrusions 222, and the multiple first protrusions 222 are evenly distributed along the circumference of the wire fixing bracket 220. There are multiple grooves 2111, and the multiple grooves 2111 are arranged one-to-one with the multiple first protrusions 222, so that the force between the support sleeve 210 and the wire fixing bracket 220 is uniform, which can further limit the relative rotation or sliding between the support sleeve 210 and the wire fixing bracket 220 during the operation of the central axis torque sensor 1000, thereby improving the stability of operation.

[0062] Reference Figure 2 and Figure 6 As shown, in order to facilitate the alignment of the second opening 240 of the wire fixing bracket 220 and the first opening 230 of the support sleeve 210, the second opening 240 of the central axis torque sensor 1000 of another embodiment of the present invention is formed with a second protrusion 223 on the bottom wall of the wire fixing bracket 220 in the radial direction along the axial protrusion of the wire fixing bracket 220, and the second protrusion 223 is positioned and connected in the first opening 230. The second protrusion 223 is inserted into the first opening 230, and the second protrusion 223 cooperates with the first opening 230 to align the first opening 230 and the second opening 240, that is, the axial wiring channel 600 and the radial wiring channel 700 are aligned, so as to prevent the first opening 230 and the second opening 240 from being misaligned and causing the sensor harness 300 to be squeezed and broken. Moreover, the second protrusion 223 can also guide the sensor harness 300 in the first opening 230 to the second opening 240 more smoothly, thereby reducing wear of the harness at the junction of the axial wiring channel 600 and the radial wiring channel 700 .

[0063] As another embodiment, the above two implementations may be combined to facilitate alignment of the second opening 240 of the wire fixing bracket 220 and the first opening 230 of the support sleeve 210 , while improving the stability of the connection between the support sleeve 210 and the wire fixing bracket 220 .

[0064] Reference Figure 5 As shown, a support sleeve 210 of an embodiment of the present invention includes an inner tube portion 212, an outer tube portion 213 and a connecting portion 211. The support sleeve 210 is a metal part or a plastic part, and can be formed by integral processing or manufactured separately. The inner tube portion 212 is located in the outer tube portion 213, the inner tube portion 212 and the outer tube portion 213 are coaxially arranged, and the connecting portion 211 connects the inner tube portion 212 and the outer tube portion 213. The first opening 230 is formed in the outer tube portion 213 and the connecting portion 211. The outer tube portion 213 is connected to the frame bottom tube 2000 to achieve fixation of the support sleeve 210 and the frame bottom tube 2000; the inner tube portion 212 is connected to the first wrist guard 400 to achieve indirect fixation of the first wrist guard 400 and the frame bottom tube 2000.

[0065] Reference Figure 2 and Figure 5 As shown, the outer wall of the outer tube portion 213 is provided with a first external thread 2131 , and the first external thread 2131 cooperates with the first internal thread 2100 of the frame bottom bracket 2000 to achieve fixed connection of the support sleeve 210 .

[0066] Reference Figure 2 and Figure 7 As shown, the first wrist guard 400 includes a sleeve portion 410 and a first mounting portion 420 connected to each other, the sleeve portion 410 is provided with an inner hole for the central axis 100 to pass through, the outer wall of the sleeve portion 410 is provided with a second outer thread 411, the inner wall of the inner cylinder portion 212 is provided with a second inner thread 2121, and the sleeve portion 410 is connected to the inner cylinder portion 212 through the cooperation of the second outer thread 411 and the second inner thread 2121.

[0067] Reference Figure 1 and Figure 2 As shown, it can be understood that a bearing mounting hole 421 is provided in the first mounting portion 420, the bearing mounting hole 421 is communicated with the inner hole of the sleeve portion 410, a bearing is installed in the bearing mounting hole 421, the inner ring of the bearing is connected to the central shaft 100, and the outer ring of the bearing is connected to the peripheral wall of the bearing mounting hole 421. A clamping groove 422 is provided on the peripheral wall of the bearing mounting hole 421, and a clamping spring 423 is installed in the clamping groove 422. The clamping spring 423 can position the left side of the bearing, and the right side of the bearing is abutted and positioned with the end wall of the bearing mounting hole 421, thereby making the installation of the bearing more reliable.

[0068] The second wrist guard 500 includes a second mounting portion, which is also equipped with a bearing, and the central axis 100 is mounted in the second mounting portion through the bearing. Therefore, the central axis 100 can be stably supported on the first wrist guard 400 and the second wrist guard 500.

[0069] Reference Figure 2 As shown, the first wrist guard 400, the wire fixing bracket 220 and the frame bottom bracket 2000 of the embodiment of the present invention are sealed by surface contact. The first mounting portion 420 is provided with a first end face 424 at one end facing the sleeve portion 410, and the annular portion 221 is provided with a second end face 2211 at one end facing the first mounting portion 420, and the second end face 2211 abuts against the first end face 424. The annular portion 221 is provided with a third end face 2212 at one end facing the frame bottom bracket 2000, and the third end face 2212 abuts against the fourth end face 2200 of the frame bottom bracket 2000. Therefore, the sealing performance between the first wrist guard 400, the wire fixing bracket 220 and the frame bottom bracket 2000 can be ensured.

[0070] The sensor harness 300 passes through between the first end face 424 and the fourth end face 2200 , which can effectively limit the sensor harness 300 , prevent the sensor harness 300 from shaking and shifting, and ensure the stability of the harness during the operation of the electric bicycle.

[0071] Reference Figure 1 and Figure 3 As shown, an electric bicycle according to an embodiment of the present invention comprises a frame, a driving device and the middle shaft torque sensor 1000 of the above embodiment. The frame comprises a frame five-way tube 2000, and the middle shaft torque sensor 1000 is installed on the frame five-way tube 2000. The central axis torque sensor 1000 of the embodiment of the present invention is provided with a routing mechanism 200 connected to the frame five-way tube 2000, the routing mechanism 200 is provided with an axial routing channel 600 located inside the frame five-way tube 2000 and a radial routing channel 700 located outside the frame five-way tube 2000, the first wrist guard 400 is located at one end of the frame five-way tube 2000 and connected to the routing mechanism 200, the sensor harness 300 is positioned and guided by the axial routing channel 600 and the radial routing channel 700 in turn, so that the sensor harness 300 can pass from the frame five-way tube 2000 toward one end of the first wrist guard 400, reducing the process of opening a hole in the frame five-way tube 2000, and the sensor harness 300 will not be squeezed when disassembling and assembling the vehicle, effectively reducing the risk of the sensor harness 300 breaking. The electric bicycle of the embodiment of the present invention can simplify the assembly process and improve production efficiency.

[0072] Since the electric bicycle of the embodiment of the present invention adopts all the technical solutions of the central axis torque sensor of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0073] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. The middle axle torque sensor is installed on the bottom bracket of the frame. It is characterized in that include: A wiring mechanism connected to the frame bottom bracket, wherein the wiring mechanism is provided with an axial wiring channel located inside the frame bottom bracket and a radial wiring channel located outside the frame bottom bracket; A first wrist guard connected to the wiring mechanism and located at one end of the bottom bracket tube of the frame; The sensor harness is configured to pass through one end of the frame five-way pipe toward the first wrist guard, and a partial structure of the sensor harness is arranged in the axial wiring channel and the radial wiring channel.

2. The center shaft torque sensor according to claim 1, Features: The wiring mechanism includes a support sleeve and a wire fixing bracket, the support sleeve is connected to the inner wall of the frame five-way tube, the outer peripheral wall of the support sleeve is provided with a first opening, and the first opening is formed as the axial wiring channel; the wire fixing bracket is connected to the support sleeve and abuts against the end wall of the frame five-way tube, and the wire fixing bracket is provided with a second opening, and the second opening is formed as the radial wiring channel.

3. The center shaft torque sensor according to claim 2, Features: The support sleeve includes a first positioning mechanism, and the wire fixing bracket includes a second positioning mechanism. The first positioning mechanism is connected to the second positioning mechanism and is configured to enable the support sleeve and the wire fixing bracket to move relative to each other in the axial direction of the support sleeve, and to limit the relative movement of the support sleeve and the wire fixing bracket in a direction perpendicular to the axial direction of the support sleeve.

4. The center shaft torque sensor according to claim 3, Features: The support sleeve includes a connecting portion, the first positioning mechanism is at least one groove provided in the connecting portion, the wire fixing bracket includes an annular portion abutting against the five-way tube of the frame, and the second positioning mechanism is a first protrusion provided in the annular portion and positioned and matched with the groove.

5. The center shaft torque sensor according to claim 4, Features: There are a plurality of the first protrusions, and the plurality of the first protrusions are evenly distributed along the circumference of the wire fixing bracket. There are a plurality of the grooves, and the plurality of the grooves are arranged in one-to-one correspondence with the plurality of the first protrusions.

6. The center shaft torque sensor according to claim 2, Features: A second protrusion is formed on a bottom wall of the second opening in the radial direction of the wire fixing bracket and protrudes along the axial direction of the wire fixing bracket. The second protrusion is connected to the first opening.

7. The center shaft torque sensor according to claim 2, Features: The support sleeve comprises an inner tube portion and an outer tube portion, wherein the inner tube portion is connected to the first wrist guard, and the outer tube portion is connected to the five-way tube of the frame.

8. The center shaft torque sensor according to claim 7, Features: The inner wall of the five-way tube of the frame is provided with a first internal thread, and the outer wall of the outer tube is provided with a first external thread matching with the first internal thread.

9. The center shaft torque sensor according to claim 7, Features: The central axis torque sensor also includes a central axis, the first wrist guard includes a sleeve portion for allowing the central axis to pass through, the sleeve portion is provided with a second external thread, and the inner wall of the inner cylinder portion is provided with a second internal thread matching the second external thread.

10. The center shaft torque sensor according to claim 9, Features: The first wrist guard also includes a first mounting portion connected to the sleeve portion, a bearing mounting hole is provided in the first mounting portion, and the bearing mounting hole is communicated with the inner hole of the sleeve portion.

11. The center shaft torque sensor according to claim 10, Features: The first mounting portion has an end facing the sleeve portion with a first end surface, the wire fixing bracket includes an annular portion, the annular portion has an end facing the first mounting portion with a second end surface, and the second end surface abuts against the first end surface.

12. The center shaft torque sensor according to claim 11, Features: The annular portion has a third end surface at one end facing the frame five-way pipe, the third end surface abuts against a fourth end surface of the frame five-way pipe, and the sensor harness passes through between the first end surface and the fourth end surface.

13. Electric bicycles, It is characterized in that include: Frame bottom bracket tube; The middle axle torque sensor according to any one of claims 1 to 11 is mounted on the bottom bracket tube of the frame.

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