Disc claw power meter

Abstract

The utility model relates to the technical field of bicycle supplies, and discloses a disc claw power meter which is used for being installed between a crank and a driving chain wheel of a bicycle and comprises a disc body, connecting pieces, strain gauges and a circuit board, the disc body is used for being connected with the crank, the connecting pieces are arranged at the upper end and the lower end of the disc body, and each connecting piece comprises two connecting beams. One end of each connecting beam is connected with the peripheral wall of the disc body, the other end of each connecting beam is used for being connected with a driving chain wheel, the thickness of each connecting beam is 8-10 mm, a mounting groove is formed between the two connecting beams of the connecting piece, the circuit board is mounted in the mounting groove, the strain gauges are arranged on the connecting beams, and the strain gauges are electrically connected with the circuit board. The disc claw power meter provided by the utility model is higher in structural strength and longer in service life, and can ensure the measurement precision.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bicycle article technical field, in particular to a disc claw power meter. BACKGROUND

[0002] In the bicycle power measurement technology, the disc claw power meter is a common measuring device, widely used in bicycle sports and training. The disc claw power meter is usually installed between the crank and the chainring, used to measure the torque and power output generated during cycling, and its accuracy and reliability have important influence on the training and competition of cyclists.

[0003] The existing disc claw power meter includes a disc body, a connecting beam, a strain gauge and a circuit board. The connecting beam is arranged on the outer circumferential surface of the disc body, and the strain gauge is arranged on the connecting beam to measure the stress condition of the disc claw structure and transmit the measurement signal to the circuit board for processing. In the prior art, the circuit board is usually laid flat on the front or back surface of the connecting beam, and a shell is needed to cover the circuit board to protect the circuit board. Since the circuit board and the shell have a certain thickness, in order to not affect the overall installation of the disc claw power meter, the thickness of the connecting beam usually needs to be reduced to form an installation position for installing the circuit board on the surface, resulting in that the thickness of the connecting beam is only 4-6mm.

[0004] However, the reduction of the thickness of the connecting beam will directly affect its structural strength, which may cause the connecting beam to deform or even break under high load or long time use, thereby affecting the measurement accuracy and service life. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a disc claw power meter with stable structure and long service life.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A disc claw power meter for installation between the crank and the driving sprocket of a bicycle, comprising a disc body, a connecting piece, a strain gauge and a circuit board. The disc body is used to connect with the crank. The upper end and the lower end of the disc body are provided with the connecting piece. The connecting piece includes two connecting beams. One end of the connecting beam is connected with the outer circumferential wall of the disc body. The other end of the connecting beam is used to connect with the driving sprocket. The thickness of the connecting beam is 8-10mm. The two connecting beams of the connecting piece form an installation groove. The circuit board is installed in the installation groove. The strain gauge is arranged on the connecting beam. The strain gauge is electrically connected with the circuit board.

[0008] Preferably, the two connecting beams of the connecting piece are connected with each other by a connecting beam. The installation groove is formed between the two connecting beams, the connecting beam and the disc body.

[0009] Preferably, the connecting beams, the disc body and the connecting beams are integrally formed.

[0010] Preferably, the inner side wall of the mounting groove is arc-shaped in the circumferential direction.

[0011] Preferably, a first cover is arranged between the two connecting beams of the connecting member on which the circuit board is mounted, and covers one side of the mounting groove close to the front face of the disc body.

[0012] Preferably, the two connecting beams of the same connecting member are symmetrically and obliquely arranged, and the distance between the two connecting beams gradually decreases from the direction close to the disc body.

[0013] Preferably, the two connecting members are symmetrically arranged, and the rear side of the two connecting beams of the connecting member is provided with a receiving groove, and the strain gauge is arranged in each receiving groove, and the line connecting the receiving groove of one of the two connecting beams of the connecting member to the center of the disc body is a, the line connecting the receiving groove of the other connecting beam of the connecting member to the center of the disc body is b, and the included angle between a and b is β, 70°≤β≤90°.

[0014] Preferably, a rear cover is arranged on the rear side of the disc body and the connecting member, covers one side of the mounting groove close to the back face of the disc body, and covers the receiving groove.

[0015] Preferably, a battery is arranged in the mounting groove at one of the connecting members, the circuit board is arranged in the mounting groove at the other connecting member, and the battery is electrically connected with the circuit board.

[0016] Preferably, a second cover is arranged between the two connecting beams of the connecting member on which the battery is mounted, and covers one side of the mounting groove close to the front face of the disc body.

[0017] Compared with the prior art, the disc claw power meter has the beneficial effects that:

[0018] In the utility model, the crank of bicycle is drivenly connected with the disc body, the connecting beam is fixed on the driving sprocket through the connecting hole and the bolt, so that the disc claw power meter is assembled to the bicycle, thereby the output power when the user rides can be detected. Since the circuit board of the existing disc claw power meter is laid flat on the front face or the back face of the connecting beam, this mode will cause the overall thickness of the disc claw power meter to increase, in order to not affect the installation of the disc claw power meter, the thickness of the connecting beam will be reduced to 4-6mm to form the position installation circuit board, which also affects the structural stability of the connecting beam. In the utility model, the installation groove is formed between the two connecting beams of the connecting piece, then the circuit board is installed in the installation groove, so that the connecting beam does not need to be reduced in thickness, the thickness of the connecting beam can be kept at 8-10mm, the thickness of the connecting beam can be close to the thickness of the disc body, thereby the structural strength of the connecting beam can be ensured, so that under the condition of high load or long time use of the disc claw power meter, the connecting beam is not prone to deformation or even fracture, thereby the measurement accuracy and service life are not affected. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the whole structure front view schematic drawing of the utility model embodiment;

[0020] Figure 2 It is the whole structure back view schematic drawing of the utility model embodiment;

[0021] Figure 3 It is the back view schematic drawing of the disc body and the connecting piece of the utility model embodiment;

[0022] Figure 4 It is the whole structure explosion drawing of the utility model embodiment;

[0023] Figure 5 It is the angle schematic drawing of the connecting beam of the utility model embodiment.

[0024] In the drawing, 1, disc body;11, spline groove;12, wiring slot;2, connecting piece;21, connecting beam;22, installation groove;23, connecting beam;24, connecting hole;25, accommodating groove;3, strain gauge;4, circuit board;5, first cover;6, rear cover;7, battery;8, second cover. DETAILED DESCRIPTION

[0025] The specific implementation of the utility model will be described in further detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0026] In the description of the utility model, it should be understood that the phrase "comprising" used in the utility model specification means that the features, integers, steps, operations, components and / or assemblies exist, but it does not exclude the existence or addition of one or more other features, integers, steps, operations, components, assemblies and / or their combinations. It should be understood that when we say that a component is "connected" to another component, it can be directly connected to the other component or there can be an intermediate component. The phrase "and / or" used herein includes all or any unit and all combinations of the associated listed items.

[0027] As Figures 1 to 5 The utility model relates to a disc claw power meter for installing between the crank and drive sprocket of bicycle, including disc body 1, connecting piece 2, strain gauge 3 and circuit board 4, the middle part of disc body 1 is equipped with spline groove 11 to let disc body 1 be used to connect with crank, the upper end and the lower end of disc body 1 are equipped with connecting piece 2, connecting piece 2 includes two connecting beams 21, one end of connecting beam 21 is connected with the outer wall of disc body 1, the other end of connecting beam 21 is equipped with connecting hole 24 to be used to connect with drive sprocket, the thickness of connecting beam 21 is 8-10mm, the connecting beam 21 of connecting piece 2 forms installation groove 22 between two, circuit board 4 is installed in installation groove 22, strain gauge 3 is located on connecting beam 21, and strain gauge 3 is electrically connected with circuit board 4.

[0028] In the utility model, the crank of bicycle is transmission connected with disc body 1, connecting beam 21 is fixed on drive sprocket through connecting hole 24 and bolt to assemble disc claw power meter to bicycle to detect the output power when user rides. Because the circuit board 4 of existing disc claw power meter is laid on the front or back of connecting beam 21, this mode will lead to the increase of the overall thickness of disc claw power meter, in order to not affect the installation of disc claw power meter, the thickness of connecting beam 21 is reduced to 4-6mm to form the position installation circuit board 4, which also affects the structural stability of connecting beam 21. For this, the utility model forms installation groove 22 between the two connecting beams 21 of connecting piece 2, and then installs circuit board 4 in installation groove 22, so that connecting beam 21 does not need to reduce the thickness, the thickness of connecting beam 21 can be kept at 8-10mm, the thickness of connecting beam 21 can be close to the thickness of disc body 1, so as to ensure the structural strength of connecting beam 21, so that connecting beam 21 is not prone to deformation or even fracture under the condition of high load or long time use of disc claw power meter, thereby not affecting the measurement accuracy and service life.

[0029] In the embodiment, the two connecting beams 21 of the connecting member 2 are connected with each other by a connecting beam 23, and the two connecting beams 21, the connecting beam 23 and the disc body 1 form the mounting groove 22.

[0030] That is, after the circuit board 4 is placed in the mounting groove 22, the two connecting beams 21, the connecting beam 23 and the disc body 1 collectively enclose the circuit board 4 to protect the circuit board 4.

[0031] Preferably, the connecting beams 21, the disc body 1 and the connecting beam 23 are integrally formed and fixed. Thus, the stability of the disc claw power meter as a whole can be ensured to improve the service life.

[0032] Further, the inner side wall of the mounting groove 22 is arc-shaped in the circumferential direction.

[0033] That is, after the two connecting beams 21, the connecting beam 23 and the disc body 1 form the mounting groove 22, the side of the connecting beam 21 located in the mounting groove 22 and the transition between the connecting beam 21 and the disc body 1 are both arc-shaped, so that the inner side wall of the mounting groove 22 is arc-shaped in the circumferential direction. Thus, the stress concentration problem can be reduced, the overall structure of the disc claw power meter is more stable, and the service life is higher.

[0034] In the embodiment, the disc claw power meter further comprises a first cover 5, and the first cover 5 is arranged between the two connecting beams 21 of the connecting member 2 on which the circuit board 4 is mounted, to cover the side of the mounting groove 22 close to the front face of the disc body 1.

[0035] That is, the first cover 5 is arranged on the side of the mounting groove 22 close to the front face of the disc body 1, and the shape of the first cover 5 is adapted to the shape of the mounting groove 22, so that the first cover 5 can completely cover the circuit board 4 to protect the circuit board 4 in the mounting groove 22.

[0036] Moreover, since the circuit board 4 is arranged in the mounting groove 22, the first cover 5 is also arranged in the mounting groove 22, so that the first cover 5 does not increase the thickness of the disc claw power meter. Compared with the existing disc claw power meter, the first cover 5 does not occupy the space of the thickness, so that the thickness of the connecting beams 21 and the disc body 1 can be ensured to be close to the maximum thickness that can be accommodated by the disc claw power meter on a bicycle. Thus, the structure of the disc claw power meter is more stable, the lateral rigidity and strength are maximized, and the service life is higher.

[0037] In the embodiment, the two connecting beams 21 of the same connecting member 2 are symmetrically and obliquely arranged, and the distance between the two connecting beams 21 gradually decreases from the direction close to the disc body 1.

[0038] That is, the two connecting beams 21 and the connecting beam 23 form a triangular stable structure, which is beneficial to improve the structural stability of the disc claw power meter, and the disc claw power meter is stably installed on the bicycle, the service life is improved, and since the disc body 1 is disc-shaped, the distance between the two connecting beams 21 gradually decreases from the connecting beam 23 to the disc body 1, so that the two ends of the two connecting beams 21 connected to the disc body 1 are close, the length of the connecting beam 21 can be reduced, and the weight of the disc claw power meter is also reduced.

[0039] Preferably, the two connecting members 2 are symmetrically arranged, the rear side of the two connecting beams 21 of the connecting member 2 is provided with a receiving groove 25, the strain gauge 3 is arranged in each receiving groove 25, and the angle between the line a from the receiving groove 25 of one of the two connecting beams 21 to the center of the disc body 1 and the line b from the receiving groove 25 of the other connecting beam 21 to the center of the disc body 1 is β, and 70°≤β≤90°. That is, the angle between the two connecting beams 21 on the connecting member 2 is 70°-90°.

[0040] Therefore, the utility model only has connecting members 2 at the upper end and the lower end of the disc body 1, and is connected with the driving sprocket through the connecting members 2, compared with the existing disc claw power meter, the structure on the left and right sides is removed, so that the weight is reduced under the premise of ensuring the structural strength of the disc claw power meter.

[0041] In the embodiment, the disc claw power meter further comprises a rear cover 6, the rear cover 6 is attached to the rear side of the disc body 1 and the connecting member 2, the rear cover 6 covers the side of the mounting groove 22 close to the back of the disc body 1, and the rear cover 6 covers the receiving groove 25, so that the rear cover 6 can completely cover the two sides of the mounting groove 22 in cooperation with the first cover 5, and can further protect the circuit board 4, and the rear cover 6 can cover the receiving groove 25 to protect the strain gauge 3.

[0042] In the embodiment, the disc claw power meter further comprises a battery 7, the battery 7 is arranged in the mounting groove 22 at one of the connecting members 2, the circuit board 4 is arranged in the mounting groove 22 at the other connecting member 2, and the battery 7 is electrically connected with the circuit board 4.

[0043] The battery 7 and the circuit board 4 are arranged in the two mounting grooves 22 correspondingly, so that the circuit board 4 and the battery 7 can be better protected, and the arrangement of the circuit board 4 and the battery 7 does not affect the thickness of the disc body 1 and the connecting beam 21 of the disc claw power meter, which is beneficial to ensure the stability of the disc claw power meter.

[0044] In the embodiment, the disc claw power meter further comprises a second cover 8, the second cover 8 is arranged between the two connecting beams 21 of the connecting piece 2 on which the battery 7 is mounted, and is used for covering the mounting groove 22 near the front side of the disc body 1. Thus, the rear cover 6 can be matched to jointly close the two sides of the mounting groove 22, so as to play a better protection role.

[0045] In the embodiment, the disc body 1 is provided with a wiring groove 12 at the edge of the rear side and between the two connecting pieces 2, one end of the wiring groove 12 extends to the accommodating groove 25 of one connecting piece 2, and the other end of the wiring groove 12 extends to the accommodating groove 25 of the other connecting piece 2.

[0046] That is, the wiring grooves 12 are arranged at the edges of the left and right sides of the rear side of the disc body 1, so that the wiring of the electric wire is facilitated, the position of the electric wire is ensured to be stable, the battery 7 and the strain gauge 3 can be smoothly electrically connected to the circuit board 4, the disc claw power meter can be used stably for a long time, meanwhile, the rear cover 6 can cover the wiring grooves 12, the electric wire is hidden in the wiring grooves 12, the electric wire cannot be exposed to affect the appearance, and the electric wire cannot be wound with the crank during the riding of the user, so that the safety of riding is ensured.

[0047] The above is only the preferred embodiment of the utility model, and it should be noted that, for ordinary skilled persons in the technical field, several improvements and replacements can be made without departing from the technical principle of the utility model, and these improvements and replacements should also be regarded as the protection range of the utility model.

Claims

1. A caliper power meter for mounting between the crank and drive sprocket of a bicycle, characterized in that, The device includes a disc body, connectors, strain gauges, and a circuit board. The disc body is used to connect to the crank. The connectors are provided at both the upper and lower ends of the disc body. Each connector includes two connecting beams. One end of each connecting beam is connected to the outer peripheral wall of the disc body, and the other end of each connecting beam is used to connect to the drive sprocket. The thickness of each connecting beam is 8-10 mm. A mounting groove is formed between the two connecting beams of the connector. The circuit board is installed in the mounting groove. The strain gauge is disposed on the connecting beam and is electrically connected to the circuit board.

2. The disk claw power meter according to claim 1, characterized in that, The two connecting beams of the connector are interconnected by a connecting beam, and the mounting groove is formed between the two connecting beams, the connecting beam, and the disc.

3. The disk claw power meter according to claim 2, characterized in that, The connecting beam, the disk, and the connecting beam are integrally formed and fixed.

4. The disk claw power meter according to claim 2, characterized in that, The inner wall of the mounting groove is arc-shaped along the circumference.

5. The disk claw power meter according to claim 1, characterized in that, It also includes a first cover, which is provided between the two connecting beams of the connector on which the circuit board is mounted, to cover the side of the mounting groove near the front of the disc.

6. The disk claw power meter according to claim 1, characterized in that, The two connecting beams of the same connector are symmetrically and inclined, and the distance between the two connecting beams gradually decreases from the direction closer to the disc.

7. The disk claw power meter according to claim 6, characterized in that, The two connectors are symmetrically arranged. Each of the two connecting beams of the connector has a receiving groove on its rear side. Each receiving groove contains a strain gauge. In the two connecting beams of the connector, the line connecting the receiving groove of one connecting beam to the center of the disk body is a, and the line connecting the receiving groove of the other connecting beam to the center of the disk body is b. The included angle between a and b is β, where 70°≤β≤90°.

8. The disk claw power meter according to claim 7, characterized in that, It also includes a back cover, which is fitted to the rear side of the disc body and the connector, the back cover covering the side of the mounting groove near the back of the disc body, and the back cover covering the receiving groove.

9. The disk claw power meter according to claim 1, characterized in that, It also includes a battery, which is disposed in the mounting slot at one of the connectors, and the circuit board is disposed in the mounting slot at the other connector, and the battery is electrically connected to the circuit board.

10. The disk claw power meter according to claim 9, characterized in that, It also includes a second cover, which is provided between the two connecting beams of the connector on which the battery is mounted, to cover the side of the mounting groove near the front of the disc.

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