CN101024416A - Electric bicycle transmission sensor device - Google Patents

Abstract

The invention relates to a transmission sensor device for an electric bicycle, which includes a rear wheel hub, a sprocket wheel and a rear wheel shaft, and is characterized in that: a drive nut is arranged in the right part of the rear wheel hub, and a needle bearing is arranged between the drive nut and the rear wheel hub; A transmission torsion spring is positioned and connected between the first bearing seat and the drive nut; a displacement screw sleeve matched with it is provided in the drive nut; the sprocket is matched with the second bearing seat and connected to the right end of the drive nut; the right end of the rear axle A notch is arranged at the top, a displacement sensing device is arranged in the notch, and a rotational speed sensing device is arranged on the outside of the rear wheel hub and on the brake. The invention has a compact structure and makes full use of the space in the rear wheel hub; while directly participating in the transmission, it detects the torque and speed signals synchronously, and the obtained signals are accurate and high in precision; in order to realize the intelligent control of man-machine integration, the electric energy is effectively used, increasing Lay the foundation for continued mileage. It is self-adaptive.

Description

Electric bicycle transmission sensor device

technical field

The invention relates to bicycle components, in particular to an electric bicycle transmission sensing device.

Background technique

Electric bicycles are made by adding batteries, electric motors and speed control devices on the basis of ordinary bicycles. Its speed regulating device is a commonly used electronic speed regulating device for adjusting voltage or current, which can only adjust the speed of the vehicle according to the requirements of the rider, but cannot automatically adjust the speed according to the actual road conditions. This not only makes the cyclist prone to fatigue and reduces riding comfort, but also makes the driving working state of the motor unreasonable, causing unnecessary power loss and reducing the mileage of the continuation. In order to overcome the defect of artificial speed regulation, some electric bicycles are equipped with speed sensors and control devices. For example, CN2661568Y announces a utility model patent titled "electric bicycle with power-assisted driving sensor device". The sensor is located on the frame, facing the tooth tip of the flywheel. The sensor is connected to the controller through a signal line, but only the speed signal is collected. . Another example is CN2580426Y's utility model patent titled "Pressure Sensing Device for Smart Electric Bicycle". The middle tube is provided with a piston rod. The lower end of the piston rod is connected and fixed with the middle joint. There is a displacement signal sensor corresponding to the piston rod. Periodic displacement occurs between the middle tube and the middle tube joint when the rider steps on the pedal. The displacement signal is transmitted to the controller by the sensor, which can adjust the output power of the motor. to save power. The speed signal and displacement signal collected by the above two patents are still related to the operation of the rider, but there is a certain gap with the actual working condition of the electric bicycle. The power output by the motor does not match the driving state, so it cannot fully achieve the desired the purpose of hope. The transmission terminal of the electric self-propelled vehicle is the sprocket and the rear hub connected to it. The speed, torque and change of the rear hub are the actual conditions of the operation of the electric bicycle. The existing fixed connection structure between the sprocket and the rear hub cannot be collected. The torque change signal, therefore, requires changes to the drive end components of the e-bike and how it is connected.

Contents of the invention

The object of the present invention is to provide a torsion spring type transmission sensing device for an electric bicycle. As a component of the electric bicycle transmission sensing intelligent control system, it is located at the terminal of the drive system and can synchronously collect torque and torque in the process of directly participating in the transmission. The speed signal provides real data for the controller (ECU) to control the output power of the motor in time and accurately, so that the pedaling force of the person, the output torque of the motor and the driving condition of the bicycle are always in the best matching state.

The electric bicycle transmission sensing device according to the present invention includes a rear wheel hub, a sprocket and a rear wheel shaft, and is characterized in that: the left end of the rear wheel hub is provided with locking teeth, which mesh with the corresponding locking teeth at the right end of the first bearing seat; the rear wheel hub There is a drive nut in the right part of the drive nut, and a needle bearing is arranged between the drive nut and the rear wheel hub; a drive torsion spring is positioned and connected between the first bearing seat and the drive nut; Displacement screw sleeve, the limit bolt passes through the limit screw hole on the right part of the rear hub, the radial limit groove on the drive nut, and inserts into the axial displacement groove on the displacement screw sleeve; the sprocket is matched with the second bearing seat and connected to the The right end of the transmission nut; the right part of the rear wheel shaft is provided with a notch, and the right end is provided with a central hole communicating with the notch; the rear wheel shaft passes through the transmission torsion spring, the transmission nut and the displacement screw sleeve, and its two ends are respectively connected with the first bearing Cooperate with the second bearing; there is a first plane bearing at the notch of the rear wheel shaft, the left side of the first plane bearing is close to the step at the left end of the displacement screw sleeve, and the right side is connected with the displacement bracket passing through the notch at both ends; the displacement A return spring is provided between the right side of the bracket and the second bearing; a first sensing element is arranged at the center of the displacement bracket, and the first sensing element corresponds to the first sensor located at the right end of the notch of the rear axle; the first The transmission wire of the sensor is drawn out from the center hole at the right end of the rear axle, and is connected with the controller (ECU).

The electric bicycle transmission sensing device is also provided with a second sensing element on the left outside of the rear wheel hub, and the second sensing element corresponds to the second sensor on the brake; the transmission wire of the second sensor is connected to the control device (ECU) connection.

In the electric bicycle transmission sensing device, the first sensing element and the second sensing element are magnetic steel, and the first sensor and the second sensor are Hall sensors.

In the electric bicycle transmission sensing device, a second plane bearing is arranged in the right part of the rear hub, and the left end of the transmission nut is in close contact with the second plane bearing.

The transmission sensor device of the electric bicycle is provided with a bushing and a jacket at the meshing part between the teeth at the left end of the rear hub and the teeth at the right end of the first bearing seat.

With the above structure, the torque signal can be transmitted in the process of directly participating in the transmission. The torque transmission path output by the motor is: sprocket → transmission nut → transmission torsion spring → first bearing seat → rear hub.

Since the displacement screw sleeve matched with the drive nut is limited by the limit bolt, it rotates synchronously with the rear hub in the radial direction. When the speed of the rear hub is not synchronized with the speed of the drive nut, the displacement screw sleeve rotates synchronously with the rear hub. , but also axial displacement. People's pedaling force, the torque output by the motor and the rear wheel load meet at the joint between the drive nut and the displacement screw sleeve. When going uphill, the load on the rear wheel hub increases. If the output torque of the motor is less than the actual required torque, the speed of the rear wheel hub will be inconsistent with the speed of the drive nut, resulting in inconsistent speeds of the drive nut and the displacement screw sleeve. The synchronously rotating displacement screw sleeve moves axially to the right under the control of the limit bolt, pushes the displacement bracket to move to the right and compresses the return spring, so that the first sensing element on the displacement bracket and the one on the rear axle The distance between the first sensors at the right end of the notch decreases, and the displacement signal collected by the first sensor is the signal of the actual required output torque, and is transmitted to the controller.

At the same time, the second sensor installed on the brake collects the speed change signal reflected by the second sensing element and transmits it to the controller; the controller processes the received torque and speed signals and sends out an increase output power command. When the output power of the motor increases and gradually reaches the actual needs, the displacement bracket gradually moves to the left under the action of the return spring to restore the original position. Make the person's pedaling force, the output torque of the motor and the driving condition of the bicycle always in the best matching state, thus reflecting the characteristics of self-adaptation.

The invention has the advantages of compact structure and full use of the space in the rear wheel hub; while directly participating in the transmission, the torque and speed signals are detected synchronously, and the obtained signals are accurate and high in precision; effectively realizing the intelligent control of man-machine integration The use of electric energy lays the foundation for increasing the mileage. It is self-adaptive.

Description of drawings

Fig. 1 is a schematic structural view of the present invention (relative displacement occurs between the drive nut and the displacement screw sleeve).

Fig. 2 is a cross-sectional view along line A-A of Fig. 1 .

Fig. 3 is a B-B sectional view of Fig. 1 .

Fig. 4 is a C-C sectional view of Fig. 1 .

Fig. 5 is a D-D sectional view of Fig. 1 .

Fig. 6 is a schematic diagram of no relative displacement between the drive nut and the displacement screw sleeve.

Fig. 7 is a structural schematic diagram of a drive nut.

Fig. 8 is a structural schematic diagram of the displacement screw sleeve.

Fig. 9 is a left side view of Fig. 8 .

Detailed ways

The structure of the present invention will be further described below in conjunction with the accompanying drawings.

Embodiment 1: Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, the bushing 27 is installed in the left end of the rear wheel hub 1 and protrudes from the left end. A bearing seat 5 is mounted on the protruding end of the bushing 27, the teeth on the right end of which engage with the teeth 4 on the left end of the rear wheel hub 1, the outer cover 28 is installed outside the meshing part of the first bearing seat 5 and the rear wheel hub 1, and the brake 29 is installed On the first bearing seat 5; install the second plane bearing 26 in the right part of the rear hub 1, close to the step in the rear hub 1; insert one end of the transmission torsion spring 8 into the positioning hole of the first bearing seat 5 ; Put the transmission nut 6 into the right part of the rear hub 1 and close to the second plane bearing, install the needle bearing 7 between the transmission nut and the rear hub, and insert the other end of the transmission torsion spring 8 into the transmission nut 6 Screw the displacement screw sleeve 9 into the drive nut 6, and pass the limit bolt 10 through the limit screw hole 11 on the right part of the rear hub 1 and the radial limit groove 12 on the drive nut 6, Insert into the axial displacement groove 13 on the displacement screw sleeve 9;

The right part is provided with notch 15, and the rear axle 3 that is provided with a central hole 16 communicating with the notch passes through the transmission torsion spring 8, the transmission nut 6 and the displacement screw sleeve 9, and its left end cooperates with the first bearing 17; The first planar bearing 19 is installed in the notch position of the rear axle, and its left side is close to the step at the left end of the displacement screw sleeve 9, and the right side is connected with the displacement bracket 20 passing through the notch at both ends; the first sensing element 22- Magnetic steel is contained in the center of displacement support 20, and the first sensor 23-Hall sensor is contained in the right end of the notch 15 of rear axle, and makes the first sensing element correspond to the first sensor, and the transmission wire of the first sensor is from the rear The center hole 16 at the right end of the wheel shaft is drawn out and connected with the controller (ECU); the sprocket 2 is matched with the second bearing seat 14 and connected to the right end of the drive nut 6; the return spring 21 is mounted on the displacement bracket 20 and the second bearing Between 18, the second bearing 18 cooperates with the right end of rear axle 3. This embodiment can realize the transmission of torque signals in the process of directly participating in the transmission.

Embodiment 2: Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, on the basis of Embodiment 1, the second sensing element 24-magnetic steel , installed on the left side outside the rear hub 1, the second sensor 25-Hall sensor is installed on the brake 29, and the second sensing element corresponds to the second sensor, the transmission wire of the second sensor is connected to the controller (ECU) connect. This embodiment can realize the transmission of torque signals and speed signals in the process of directly participating in the transmission.

Claims (5)

1. Electric bicycle transmission sensor device, including rear wheel hub (1), sprocket wheel (2) and rear wheel shaft (3), it is characterized in that: the left end of rear wheel hub (1) is provided with locking tooth (4), and the first The corresponding teeth on the right end of the bearing seat (5) are engaged; a drive nut (6) is arranged in the right part of the rear hub, and a needle bearing (7) is arranged between the drive nut and the rear hub; the first bearing seat (5) and the transmission nut (6) are positioned and connected with a transmission torsion spring (8); in the transmission nut (6) is provided with a displacement screw sleeve (9) that cooperates with it, and the limit bolt (10) passes through the rear hub ( 1) Insert the limit screw hole (11) on the right and the radial limit groove (12) on the drive nut (6) into the axial displacement groove (13) on the displacement screw sleeve (9); the sprocket (2 ) is matched with the second bearing seat (14) and connected to the right end of the transmission nut (6); the right part of the rear axle (3) is provided with a notch (15), and the right end is provided with a central hole (16) communicating with the notch ); the rear wheel shaft passes through the transmission torsion spring (8), the transmission nut (6) and the displacement screw sleeve (9), and its two ends cooperate with the first bearing (17) and the second bearing (18) respectively; The notch position is provided with the first plane bearing (19), the left side of the first plane bearing is close to the step at the left end of the displacement screw sleeve (9), and the right side is connected with the displacement bracket (20) passing through the notch at both ends; the displacement bracket A return spring (21) is provided between the right side of (20) and the second bearing (18); the center of the displacement support (20) is provided with a first sensing element (22), and the first sensing element and the rear The first sensor (23) at the right end of the notch of the wheel shaft is corresponding; the transmission lead of the first sensor is drawn from the center hole (16) at the right end of the rear wheel shaft, and is connected with the controller. 2. The electric bicycle transmission sensing device according to claim 1, characterized in that: a second sensing element (24) is arranged on the left part outside the rear hub (1), and the second sensing element is connected with the brake device. The second sensor (25) on (29) is corresponding; The transmission lead of the second sensor is connected with the controller. 3. The electric bicycle transmission sensing device according to claim 1 or 2, characterized in that: the first sensing element (22) and the second sensing element (24) are magnetic steel, the first sensor (23) and The second sensor (25) is a Hall sensor. 4. The electric bicycle transmission sensor device according to claim 1 or 2, characterized in that: a second plane bearing (26) is also arranged in the right part of the rear hub, and the left end of the transmission nut (6) is in contact with the second plane bearing next to. 5. The electric bicycle transmission sensor device according to claim 1 or 2, characterized in that: the meshing part between the teeth (4) at the left end of the rear hub (1) and the teeth at the right end of the first bearing seat (5), A bushing (27) and an overcoat (28) are provided.

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