Bicycle bottom-bracket-type power meter

Abstract

The present invention relates to the technical field of pedal-assist bicycles, and relates to a bicycle bottom-bracket-type power meter. The present invention comprises a left bearing seat, a right bottom bracket seat, and a bottom bracket, wherein the left bearing seat is matched with the right bottom bracket seat, and the left bearing seat and the right bottom bracket seat are both fitted over the bottom bracket. The present invention is structurally characterized by: further comprising a power measurement system, wherein the power measurement system comprises an angle-velocity sensor and a displacement-torque sensor; the angle-velocity sensor is provided in the left bearing seat; the displacement-torque sensor is provided in the right bottom bracket seat; the angle-velocity sensor works in conjunction with the displacement-torque sensor; an angle sensor circuit board, an angle sensor signal transmitting board, and an angle sensor power supply wireless receiving board are all fixed on the bottom bracket; an angle sensor power supply wireless transmitting board and an angle sensor signal receiving board are both fixed in the right bottom bracket seat; left and right ends of a torque sensor elastomer are respectively a fixed end and a free end; and the middle of the torque sensor elastomer is a deformation area.

Description

Bicycle five-way axle type power meter TECHNICAL FIELD

[0001] The present application relates to a bicycle five-way axle type power meter, belonging to the technical field of power-assisted bicycles. BACKGROUND

[0002] At present, there are several structural forms of power meters for bicycles, such as tooth disc type, crank type, pedal shaft type, etc., each having advantages and disadvantages in application, but as sports components, they all more or less exist in the exposed state, are easily damaged by rubbing, impact, etc., and have poor stability due to rain and sunlight, which shortens their service life. In addition, the currently applied power meters are all powered by lithium batteries and other power supplies, which have small power supply energy and cannot guarantee long-term use, and need to be charged frequently, which is not very convenient to use. Therefore, in the patent document with application number 201620098582.6, a bicycle power meter is disclosed. The power meter in the above prior art is exposed, which affects its service life. SUMMARY

[0003] The purpose of the present application is to overcome the above-mentioned deficiencies in the prior art and provide a bicycle five-way axle type power meter with a reasonable structural design. The power meter can be used to detect the size of the pedaling force of professional cyclists or cycling fitness enthusiasts during cycling, i.e. the energy consumption of human-powered cycling.

[0004] The technical solution adopted by the present application to solve the above problems is: the bicycle five-way axle type power meter comprises a left bearing seat, a right five-way seat and a middle shaft, the left bearing seat cooperates with the right five-way seat, and the left bearing seat and the right five-way seat are both sleeved on the middle shaft, and the structural feature is that: it further comprises a power measurement system, the power measurement system comprises an angular velocity sensor and a displacement torque sensor, the angular velocity sensor is arranged in the left bearing seat, the displacement torque sensor is arranged in the right five-way seat, and the angular velocity sensor cooperates with the displacement torque sensor.

[0005] Further, the angular velocity sensor comprises an angular sensor circuit board, an angular sensor signal emission plate, an angular sensor power wireless receiving plate, an angular sensor power wireless emission plate and an angular sensor signal receiving plate, the angular sensor circuit board, the angular sensor signal emission plate and the angular sensor power wireless receiving plate are all fixed on the middle shaft, and the angular sensor power wireless emission plate and the angular sensor signal receiving plate are both fixed in the right five-way seat.

[0006] Further, the angle sensor signal transmission plate cooperates with the angle sensor signal receiving plate, the angle sensor power wireless receiving plate cooperates with the angle sensor power wireless transmission plate, the angle sensor power wireless receiving plate is connected with the angle sensor circuit board, and the power wireless transmission plate is connected with the output signal line.

[0007] Further, the displacement torque sensor comprises a torque sensor signal circuit board, a torque sensor elastic body and a resistance strain gauge, the left and right ends of the torque sensor elastic body are fixed ends and free ends respectively, the middle part of the torque sensor elastic body is a deformation zone, the fixed end is fixed with the right five-hole base, the free end cooperates with the right five-hole base through a limiting snap ring, and the resistance strain gauge is attached to the deformation zone.

[0008] Further, the number of resistance strain gauges is multiple, a measurement circuit composed of multiple resistance strain gauges is connected with the torque sensor signal circuit board, and the torque sensor signal circuit board is connected with the output signal line.

[0009] Further, a left bearing is installed between the middle shaft and the left bearing seat, and a right bearing is installed between the middle shaft and the displacement torque sensor.

[0010] Further, the middle shaft is provided with a left snap ring, a bearing retainer ring and a right snap ring, the bearing retainer ring is located between the right bearing and the limiting snap ring, and the left snap ring and the right snap ring are respectively used for limiting the positions of the left bearing and the right five-hole base.

[0011] Further, the left bearing seat and the right five-hole base are respectively installed at the two ends of the bicycle five-hole.

[0012] Further, the middle shaft is provided in a hollow or solid structure.

[0013] Further, the limiting snap ring is provided in a C-shaped structure.

[0014] Compared with the prior art, the bicycle five-hole shaft type power meter has the following advantages: as an energy metering device, the long-term stability, accuracy and service life of the application are very important, the bicycle five-hole shaft type power meter is installed in the bicycle five-hole, so that damage caused by collision or sun exposure during use, transportation and other links can be avoided; the bicycle five-hole shaft type power meter can be powered by wireless charging, can be used for a long time without charging, does not need to be built-in any battery, is safe and reliable, and is easy to use. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a front view of the bicycle five-hole shaft type power meter according to the embodiment of the application.

[0016] Fig. 2 is a right view of the bicycle five-hole shaft type power meter according to the embodiment of the application.

[0017] Fig. 3 is a right view structural schematic diagram of the bicycle five-axle type power meter of the embodiment of the present application.

[0018] In the figure: middle shaft 1, left bearing 2, left bearing seat 3, angle sensor circuit board 4, angle sensor signal transmitting board 5, angle sensor power wireless receiving board 6, angle sensor power wireless transmitting board 7, angle sensor signal receiving board 8, torque sensor signal circuit board 9, torque sensor elastic body 10, resistance strain gauge 11, left clamping ring 12, output signal line 13, right five-axle seat 14, right bearing 15, bearing blocking ring 16, limiting clamping ring 17, right clamping ring 18. DETAILED DESCRIPTION

[0019] The present application will be further described in detail below with reference to the accompanying drawings and by embodiments, and the following embodiments are an explanation of the present application and the present application is not limited to the following embodiments.

[0020] Embodiment.

[0021] Please refer to Figs. 1 to 3, it should be understood that the structure, proportion, size, etc. shown in the drawings attached to the present specification are only used to cooperate with the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions that the present application can be implemented, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that the present application can produce, should still fall within the scope of the technical content disclosed by the present application. At the same time, if there are terms such as "up", "down", "left", "right", "middle" and "one" in the present specification, they are only for the convenience of clear description, and are not used to limit the scope of the present application, and the change or adjustment of the relative relationship is also considered as the scope of the present application.

[0022] The bicycle five-axle type power meter in the embodiment includes left bearing seat 3, right five-axle seat 14, middle shaft 1 and power measurement system, left bearing seat 3 cooperates with right five-axle seat 14, and left bearing seat 3 and right five-axle seat 14 are both sleeved on middle shaft 1, and left bearing seat 3 and right five-axle seat 14 are respectively installed at both ends of the bicycle five-axle.

[0023] The power measurement system in the embodiment includes angle speed sensor and displacement torque sensor, the angle speed sensor is arranged in left bearing seat 3, the displacement torque sensor is arranged in right five-axle seat 14, and the angle speed sensor cooperates with the displacement torque sensor.

[0024] The angle speed sensor in the embodiment comprises an angle sensor circuit board 4, an angle sensor signal transmitting board 5, an angle sensor power wireless receiving board 6, an angle sensor power wireless transmitting board 7 and an angle sensor signal receiving board 8, the angle sensor circuit board 4, the angle sensor signal transmitting board 5 and the angle sensor power wireless receiving board 6 are all fixed on the middle shaft 1, the angle sensor power wireless transmitting board 7 and the angle sensor signal receiving board 8 are both fixed in the right five-hole seat 14; the angle sensor signal transmitting board 5 cooperates with the angle sensor signal receiving board 8, the angle sensor power wireless receiving board 6 cooperates with the angle sensor power wireless transmitting board 7, the angle sensor power wireless receiving board 6 is connected with the angle sensor circuit board 4, and the power wireless transmitting board 7 is connected with the output signal line 13.

[0025] The displacement torque sensor in the embodiment comprises a torque sensor signal circuit board 9, a torque sensor elastic body 10 and a resistance strain gauge 11, the left and right ends of the torque sensor elastic body 10 are fixed end and free end respectively, the middle part of the torque sensor elastic body 10 is a deformation zone, the fixed end is fixed with the right five-hole seat 14, the free end cooperates with the right five-hole seat 14 through a limiting snap ring 17, the limiting snap ring 17 is arranged in a C-shaped structure, and the resistance strain gauge 11 is pasted in the deformation zone; the number of the resistance strain gauges 11 is multiple, the measuring circuit composed of the multiple resistance strain gauges 11 is connected with the torque sensor signal circuit board 9, the torque sensor signal circuit board 9 is connected with the output signal line 13, and the torque sensor signal circuit board 9 is fixed in the right five-hole seat 14.

[0026] The middle shaft 1 in the embodiment is arranged in a hollow or solid structure, the left bearing 2 is installed between the middle shaft 1 and the left bearing seat 3, the right bearing 15 is installed between the middle shaft 1 and the displacement torque sensor, the left snap ring 12, the bearing retainer 16 and the right snap ring 18 are sleeved on the middle shaft 1, the bearing retainer 16 is located between the right bearing 15 and the limiting snap ring 17, and the left snap ring 12 and the right snap ring 18 are respectively used for limiting the positions of the left bearing 2 and the right five-hole seat 14.

[0027] Specifically, the bicycle five-hole shaft type power meter can adopt the installation mode and installation size according to the bicycle five-hole specifications, sizes and disassembly and assembly methods commonly used by the current road bicycles, so that the bicycle five-hole shaft type power meter can be installed on the basis that the original bicycle structure configuration, specifications and sizes are unchanged, that is, the existing bicycles can be upgraded or replaced.

[0028] The power or energy consumed in the process of human riding detected by the bicycle five-hole shaft type power meter is equal to the product of torque and rotating speed, that is,

[0029] P m (W) = 2πT (Nm) × n (r / min) / 60

[0030] =0.10472 T (Nm) x n (r / min)

[0031] According to the above mathematical model, the internal structure of the bicycle five-shaft type power meter will have a power measurement system, that is, the power measurement system includes an angle speed sensor and a displacement torque sensor combined; the angle speed sensor is mainly installed in the left bearing seat 3, that is, the left side of the bicycle five-shaft, and the displacement torque sensor is mainly installed in the right five-shaft seat 14, that is, the right side of the bicycle five-shaft, the middle shaft 1 penetrates the left bearing seat 3 and the right five-shaft seat 14, and the middle shaft 1 is supported by the left bearing 2 and the right bearing 15 to freely rotate, and the output signal line 13 penetrates from the bottom of the right five-shaft seat 14.

[0032] The torque sensor elastic body 10 is provided in a cylindrical structure, and the fixed end outer ring of the torque sensor elastic body 10 is tightly fixed with the inner hole of the right five-shaft seat 14 in a tolerance fit manner; the outer ring of the free end of the torque sensor elastic body 10 is coaxially fixed with the inner diameter of the right five-shaft seat 14, and a movable gap A of 1.5-2 mm is maintained on the circumference (as shown in FIG. 2) to facilitate the displacement of the free end of the torque sensor elastic body 10 after being stressed; a plurality of resistance strain gauges 11 are pasted in the deformation zone of the torque sensor elastic body 10, and the double-bridge measurement circuit composed of the plurality of resistance strain gauges 11 can respectively sense and detect the size of the pedaling force from the left foot or the right foot.

[0033] The torque signal detected by the double-bridge measurement circuit composed of the plurality of resistance strain gauges 11 is transmitted to the torque sensor signal circuit board 9 for quantization amplification processing, and then combined with the angular velocity electrical signal transmitted by the angle speed sensor, and finally output to the display in the form of power energy value.

[0034] Usually, the right bearing 15 is a needle bearing installed in the free end of the torque sensor elastic body 10, the outer ring of the right bearing 15 is rolling tolerance fitted with the inner hole diameter of the free end, and the inner ring of the right bearing 15 is rolling tolerance fitted with the outer diameter of the middle shaft 1; the left end of the middle shaft 1 is rolling tolerance fitted with the left bearing 2 which is a deep groove ball bearing in the left bearing seat 3, and the middle shaft 1 is coaxially supported and rolling fitted by the left bearing 2 and the right bearing 15, and the middle shaft 1 can freely rotate along its axis.

[0035] Because the sprocket is installed on the right side of the central shaft 1 near the right crank, and the chain pulling the rear wheel of the bicycle is installed on the sprocket, when the pedal crank rotates forward, the sprocket on the central shaft 1 rotates with it, and because of the counter-pulling force of the chain by the rear wheel of the bicycle, the right end of the central shaft 1 is displaced to the rear wheel direction B (as shown in FIG. 2); because there is no play between the left bearing 2 supporting the left side of the central shaft 1 and the left bearing seat 3, the left side of the central shaft 1 only rotates and does not displace, and the right bearing 15 supporting the right side of the central shaft 1 is installed on the free end of the torque sensor elastic body 10, and a play A of 1.5-2 mm is reserved between the free end and the right five-way seat 14; therefore, when the sprocket rotates with the central shaft 1 under force, the displacement B of the right end of the central shaft 1 to the rear wheel direction is synchronized by the right bearing 15 of the free end of the torque sensor elastic body 10, the free end of the torque sensor elastic body 10 is displaced in the same direction as the central shaft 1 by the right bearing 15, and the deformation of the resistance strain gauge 11 pasted on the deformation zone of the torque sensor elastic body 10 is caused, the change amount of the displacement B of the free end of the torque sensor elastic body 10 is sensed and detected by the measurement circuit composed of the resistance strain gauge 11 pasted in the deformation zone of the torque sensor elastic body 10, the size signal of the torque is converted into an electrical signal output; the measurement circuit composed of several resistance strain gauges 11 is proportional to the size of the displacement, and the size of the displacement is proportional to the size of the human force pedaling, and the proportional amount is a completely linear relationship.

[0036] The angle sensor circuit board 4, the angle sensor signal transmission board 5, and the angle sensor power wireless reception board 6 are bundled and combined together and fixed on the central shaft 1, and can rotate synchronously with the central shaft 1; when the central shaft 1 rotates at 0-360°, the angle sensor circuit board 4 can sense and detect the position or angle of the central shaft 1 at the moment, and the speed of rotation, and the angle, position, and speed electrical signals generated are transmitted to the angle sensor signal transmission board 5, the angle sensor signal transmission board 5 transmits the electrical signal of the position or angle of the central shaft 1 at the moment to the circuit on the angle sensor signal reception board 8 in a static state, and then combines, modulates, and processes the electrical signal on the torque sensor signal circuit board 9, and finally obtains the power energy electrical signal generated.

[0037] The angle sensor power wireless transmission plate 7 and the angle sensor signal receiving plate 8 are fixed in the inner cavity of the right five-hole seat 14, wherein the angle sensor power wireless transmission plate 7 and the angle sensor power wireless receiving plate 6 are arranged as one moving and one static, that is, one pair of coils in the angle sensor power wireless transmission plate 7 and the angle sensor power wireless receiving plate 6 are arranged in parallel with a space therebetween. The power of the angle speed sensor comes from a power receiving induction coil on the angle sensor power wireless receiving plate 6, which is arranged in parallel with a space with the angle sensor power wireless transmission plate 7 fixedly and statically facing each other in the right five-hole seat 14. The angle sensor power wireless transmission plate 7 also has an induction coil. The power supply obtained from the outside through the output signal line 13 passes through the induction coil of the angle sensor power wireless transmission plate 7 fixedly and statically in the right five-hole seat 14, and is inductively supplied to the induction coil of the angle sensor power wireless receiving plate 6 rotatingly fixed on the middle shaft 1, so that the rotating angle sensor power wireless receiving plate 6 obtains working power.

[0038] In order to more comprehensively and accurately understand the dynamic efficiency of the left and right pedal forces when a person rides, the displacement torque sensor is combined in the internal circuit processing and cooperates with the angle speed sensor to respectively output the electric signals of the left pedal force and the electric signals of the right pedal force.

[0039] The installation mode and steps of the bicycle five-hole shaft type power meter are generally that the left bearing seat 3 and the right five-hole seat 14 are unscrewed from the middle connecting thread, so that they are separated left and right, and the middle shaft 1 is pulled out from the left side of the bicycle five-hole. The first step is to pass the output signal line 13 from the right part of the bicycle five-hole into and through the output hole of the output line hole of the bicycle five-hole bottom, and at the same time, the right five-hole seat 14 is gently pushed into the right five-hole seat 14; the second step is to gently insert the middle shaft 1 on which the angle speed sensor is installed into the left side of the bicycle five-hole and pass out of the right five-hole seat 14; the third step is to insert the left bearing seat 3 into the middle shaft 1 from the left side and tighten and fix the thread of the right five-hole seat 14; the fourth step is to install the limiting snap ring 17 between the free end of the fixed body of the torque sensor 10 and the right five-hole seat 14, so that the open mouth of the limiting snap ring 17 faces the direction of the bicycle rear wheel; the fifth step is to install the left snap ring 12 on the left side of the middle shaft 1 and the right snap ring 18 on the right side, so as to ensure that the middle shaft 1 can rotate freely and not move left and right.

[0040] Furthermore, it should be noted that the specific embodiments described in the specification are merely illustrative of the present application and that changes can be made in the shape, size, and arrangement of parts, as well as in the details of the steps or steps of the method described herein, without departing from the scope of the application. Any equivalent changes or simple changes made to the configuration, features and principles described in the present application are included in the scope of the present application. Those skilled in the art can make various modifications or supplements to the specific embodiments described or use similar ways to replace them, as long as they do not deviate from the structure of the present application or exceed the scope defined by the claims.

Claims

1. A bicycle bottom bracket axle power meter, comprising a left bearing seat (3), a right bottom bracket axle (14) and a bottom bracket axle (1), wherein the left bearing seat (3) cooperates with the right bottom bracket axle (14), and the left bearing seat (3) and the right bottom bracket axle (14) are both sleeved outside the bottom bracket axle (1), characterized in that: It also includes a power measurement system, the power measurement system includes an angular velocity sensor and a displacement torque sensor, the angular velocity sensor is arranged in the left bearing seat (3), the displacement torque sensor is arranged in the right five-way seat (14), and the angular velocity sensor cooperates with the displacement torque sensor; The angle speed sensor comprises an angle sensor circuit board (4), an angle sensor signal transmitting board (5), an angle sensor power wireless receiving board (6), an angle sensor power wireless transmitting board (7) and an angle sensor signal receiving board (8), wherein the angle sensor circuit board (4), the angle sensor signal transmitting board (5) and the angle sensor power wireless receiving board (6) are all fixed on the central axis (1), and the angle sensor power wireless transmitting board (7) and the angle sensor signal receiving board (8) are both fixed in the right five-way seat (14); The displacement torque sensor comprises a torque sensor signal circuit board (9), a torque sensor elastic body (10) and a resistance strain gauge (11), wherein the left and right ends of the torque sensor elastic body (10) are respectively a fixed end and a free end, and the middle portion of the torque sensor elastic body (10) is a deformation zone, wherein the fixed end is fixed to the right five-way seat (14), and the free end is matched with the right five-way seat (14) via a limiting clamp (17), and the resistance strain gauge (11) is adhered to the deformation zone.

2. The bicycle bottom bracket axle power meter according to claim 1, characterized in that: The angle sensor signal transmitting board (5) cooperates with the angle sensor signal receiving board (8), the angle sensor power wireless receiving board (6) cooperates with the angle sensor power wireless transmitting board (7), the angle sensor power wireless receiving board (6) is connected to the angle sensor circuit board (4), and the power wireless transmitting board (7) is connected to the output signal line (13).

3. The bicycle bottom bracket axle power meter according to claim 1, wherein: The number of the resistance strain gauges (11) is multiple, and the measurement circuit composed of the multiple resistance strain gauges (11) is connected to the torque sensor signal circuit board (9), and the torque sensor signal circuit board (9) is connected to the output signal line (13).

4. The bicycle bottom bracket axle power meter according to claim 1, wherein: A left bearing (2) is installed between the central shaft (1) and the left bearing seat (3), and a right bearing (15) is installed between the central shaft (1) and the displacement torque sensor.

5. The bicycle bottom bracket axle power meter according to claim 1, wherein: The middle shaft (1) is sheathed with a left snap ring (12), a bearing retaining ring (16) and a right snap ring (18); the bearing retaining ring (16) is located between the right bearing (15) and the limiting snap ring (17); the left snap ring (12) and the right snap ring (18) are used to limit the positions of the left bearing (2) and the right five-way seat (14), respectively.

6. The bicycle bottom bracket axle power meter according to claim 1, wherein: The left bearing seat (3) and the right five-way bracket (14) are respectively mounted at both ends of the five-way bracket of the bicycle.

7. The bicycle bottom bracket axle power meter according to claim 1, wherein: The central axis (1) is a hollow or solid structure.

8. The bicycle bottom bracket axle power meter according to claim 4, characterized in that: The limiting clamping ring (17) is arranged in a C-shaped structure.

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