WO2013097283A1

WO2013097283A1 - Signal-collecting apparatus for electric bicycle

Info

Publication number: WO2013097283A1
Application number: PCT/CN2012/001644
Authority: WO
Inventors: 高峰; 张来刚; 吴俊�
Original assignee: 苏州博菲利电动科技有限公司
Priority date: 2011-12-29
Filing date: 2012-12-07
Publication date: 2013-07-04
Also published as: CN102514678A; CN102514678B

Abstract

A signal-collecting apparatus for an electric bicycle, comprising a center shaft (1), a five-way fitting (7), and a one-way overrunning clutch (11), also comprising a sensor capable of determining the magnitude of a human peddling force and thereby collecting a signal outputted by the peddling force to control precisely a motor to generate proportionally a driving force. The signal-collecting apparatus for the electric bicycle is capable of determining the magnitude of the human peddling force via the sensor and thereby collecting the signal outputted by the peddling force to control precisely the motor to generate proportionally the driving force. Also, the present apparatus is of reduced costs and simplified process.

Description

TECHNICAL FIELD The present invention relates to a signal acquisition device, and more particularly to a signal acquisition device for an electric bicycle.

Background technology

Book

With the development of the domestic electric bicycle market, the proportional power system is increasingly favored by consumers and manufacturers. The current working principle of the power-assisted sensing system is to use a torque sensor to convert the pedaling force of the human pedal into a voltage signal and transmit it to the sensor. The controller analyzes the comparison and indicates the matching power of the motor output. The key to the power-assisted system. The part is a torque sensor. Common proportional power assist systems are mainly in the following forms:

1. The electric bicycle power-assisted sensors exported to Europe and the United States are basically switch-type. The original switch is cancelled. A Hall element and a magnetic steel disk are installed in the middle shaft. When the motor reaches a certain speed, the motor starts to start. Fully electric control, although the power sensor is low in price and simple in process, its power assist ratio is not accurate and the riding feeling is also poor.

2. The principle of the Japanese torque sensor is that after the human foot pedals, the spring in the central motor is pressed to generate deformation, and then the amplitude of the deformation is converted into a torque, and a groove is engraved on the outer edge of the motor, and the angle is changed at a small angle. Responsive, very sensitive, but this set of equipment has higher requirements on the material and process of the parts, and the cost is higher.

3. The torque sensor that Tsinghua University exported to Japan in the early days was equipped with a sleeve and an eccentric device in the middle shaft five-way. The human foot pedal produced an eccentric moment. This set of equipment is low in cost and simple in processing, but the precision control is difficult, and it should be corrected in the software. SUMMARY OF THE INVENTION An object of the present invention is to provide a motor capable of accurately controlling the proportional driving force generated by a motor. The signal acquisition device of the electric bicycle with low cost and simple process is as follows: The signal acquisition device of the electric bicycle includes a middle shaft, a five-way, a one-way overrunning clutch, and is characterized in that it can be stepped by determining the human power. The force size then collects the signal output by the pedaling force to precisely control the sensor that proportionally generates the driving force of the motor.

The sensor may be a coil-sensing central axis torque sensor.

Preferably, the coil induction central axis torque sensor comprises a coil, an induction coil, a movable support ring, a fixed support ring, an active oblique block and a driven oblique block;

The coil is fixedly connected to the five-way; the movable support ring is movably connected to the central shaft by a ball spline mechanism, and one end of the movable support ring is fixedly mounted with the induction coil, and the other end is fixedly mounted The active support block is fixedly connected to the five-way end, and the other end is fixedly connected to the inner side surface of the one-way overrunning clutch; the driven diagonal block is fixedly mounted on the fixed support The active inclined block abuts against the driven inclined block, and the contact surface thereof is provided with a spiral structure;

The rotation of the central shaft drives the driving of the active slanting block to generate an axial displacement, thereby driving the driven slanting block to generate an axial displacement under the action of the spiral structure and the ball spline mechanism, thereby driving the The induction coil is adjacent to the coil.

Preferably, the fixed support ring is provided with a first baffle, and the movable support ring and the induction ring are fixedly connected by a second baffle, and the first baffle and the second baffle are disposed between Flexible parts.

Preferably, the elastic member is a spring.

Preferably, the inner side surface of the movable support ring is provided with one or more first key grooves, and the outer side surface of the middle shaft is opposite to the first key groove, and a second key groove is disposed opposite to the axis of the first key groove. a portion having a length smaller than an axial length of the second key groove, and a portion of the first key groove contacting the second key groove constitutes a cylindrical key groove, wherein one or more steel balls are actively placed in the cylindrical key groove The first key groove, the second key groove, and the steel ball together constitute the ball spline mechanism.

Preferably, the first key groove and the second key groove have a semi-circular axial cross section, and the cylindrical key groove is a cylindrical key groove. Preferably, the second key groove has a semi-circular axial cross section, and the first key groove has an axial cross section with an arcuate angle corresponding to a central angle of less than 180°, and the axial ends of the first key groove are respectively disposed with The third baffle.

Preferably, a left cover and a right cover are fixedly mounted on the inner side of the five-way, the coil is located between the left cover and the right cover, and the central shaft is mounted on the left cover through the first bearing. The right cover is connected to the outer side of the fixed support ring by a second bearing; the outer side of the one-way overrunning clutch is connected to the crank plate of the electric bicycle.

Preferably, the induction coil is a permanent magnet.

A coil-sensing mid-axis torque sensor for an electric bicycle, comprising a middle shaft, a five-way, a one-way overrunning clutch, characterized by, further comprising a coil, an induction coil, a movable support ring, a fixed support ring, an active oblique block, and a driven oblique Piece;

Preferably, the fixed support ring is provided with a first baffle, and the movable support ring and the induction ring are fixedly connected by a second baffle, and the first baffle and the second baffle are disposed between Flexible parts. Preferably, the elastic member is a spring.

Preferably, the inner side surface of the movable support ring is provided with one or more first key grooves, and the outer side surface of the middle shaft is opposite to the first key groove, and a second key groove is disposed opposite to the axis of the first key groove. a portion having a length smaller than an axial length of the second key groove, and a portion of the first key groove contacting the second key groove constitutes a cylindrical key groove, wherein one or more steel balls are actively placed in the cylindrical key groove The first key groove, the second key groove, and the steel ball together constitute the ball spline mechanism. Preferably, the first key groove and the second key groove have a semi-circular axial cross section, and the cylindrical key groove is a cylindrical key groove.

Preferably, the second key groove has a semi-circular axial cross section, and the first key groove has an axial cross section with an arcuate angle corresponding to a central angle of less than 180°, and the axial ends of the first key groove are respectively disposed with The third baffle.

Preferably, the induction coil is a permanent magnet.

The signal acquisition device of the electric bicycle of the present invention can determine the magnitude of the human pedaling force by the sensor and collect the signal output by the pedaling force to accurately control the proportional driving force of the motor, and the device is low in price and simple in process. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic structural view of a center axle torque sensor of an electric bicycle according to the present invention.

2 is a signal state diagram of a center axle torque sensor of the electric bicycle of the present invention. DETAILED DESCRIPTION OF THE INVENTION In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The utility model relates to a signal collecting device for an electric bicycle, which comprises a central shaft 1, a five-way 7, a one-way overrunning clutch 11, and a signal capable of accurately collecting the driving force generated by determining the magnitude of the human pedaling force and collecting the pedaling force. sensor.

In this embodiment, a coil-sensing central axis torque sensor is used. Of course, a linear Hall position sensor, a pressure sensor, a position sensor, a photoelectric sensor or the like commonly used by those skilled in the art may also be used. 1 and 2 are a signal acquisition device for an electric bicycle including a coil-sensing center shaft torque sensor, which includes a center shaft 1, a five-way 7, a one-way overrunning clutch 11 and a coil induction center shaft torque sensor, wherein

The coil sensing central axis torque sensor comprises a coil 6, an induction coil 5, a movable support ring 17, a fixed support ring 15, an active oblique block 14 and a driven oblique block 13;

The coil 6 is fixed on the five-way 7; the movable support ring 17 is movably connected to the middle shaft 1 through a ball spline mechanism, and the movable support ring 17 is fixedly mounted with the induction ring 5 at one end thereof, and the active inclined block 14 is fixedly mounted at the other end; The support ring 15 is fixedly connected to the five-way 7 and the other end is fixedly connected to the inner side of the one-way overrunning clutch 11; the driven inclined block 13 is fixedly mounted on the fixed support ring 15, and the active oblique block 14 is abutted against the slave On the moving block 13, the contact surface is provided with a spiral structure;

The rotation of the central shaft 1 drives the active slanting block 14 to rotate and generate an axial displacement, which in turn drives the driven slant block 13 to generate an axial displacement under the action of the spiral structure and the ball spline mechanism, thereby driving the induction coil 5 close to the coil 6.

When the signal acquisition device for the electric bicycle of the present invention is used, as shown in Fig. 1, from the right to the left of the center shaft 1, the clockwise direction is the forward direction, that is, the manual driving direction is the positive direction. When the manpower stepped down the pedal, the central axis 1 fixedly connected thereto rotates, and the active oblique block 14 also rotates, causing the contact surfaces of the active oblique block 14 and the driven oblique block 13 to slide relative to each other, in the role of the spiral structure. Under the action of the ball spline mechanism, the active slanting block 14 rotates relative to the driven slanting block 13 and axial displacement occurs, resulting in radial and axial movement of the movable support ring 17, according to the active slant block The spiral direction of the contact surface design between the 14 and the driven diagonal block 13 is such that the movable support ring 17 moves axially to the right with respect to the central axis 1, and the induction coil moves in the direction of the coil.

As can be seen from the above, as long as the bicycle pedal is depressed clockwise at a certain moment, the driving force is transmitted to the center shaft 1, and the torque of the center shaft 1 is transmitted to the active tilting block 14 by the action of the ball spline mechanism, overcoming the tension of the elastic structure 4. After that, the spiral contact faces of the active slanting block 14 and the driven slanting block 13 are relatively slid, and the torque is transmitted to the driven slanting block 13 on the one hand, and the manpower is output through the overrunning clutch 11, and the movable support ring 17 is opposite to the central axis. 1 Moves to the right, causing the induction coil 5 to enter the coil 6 to the right, so the movement of the induction coil 5 to the right is proportional to the human clockwise pedaling force.

In order to explain the present invention more clearly, it is assumed that the human drive remains unchanged at this moment, then the active tilt The spiral contact faces of the block 14 and the driven diagonal block 13 are stationary after being relatively slid, directly transmitting the torque to the given support ring 15, and then outputting the manpower through the one-way overrunning clutch 11. At this time, the movable support ring 17 is also stationary after sliding relative to the center shaft 1. That is to say, when manually driven, the movable support ring 17, the induction ring 5, the active oblique block 14, the driven diagonal block 13, the fixed support ring 15 and the like are opposite to the five-way 7 and the coil 6 fixedly mounted on the five-way is At high speed, although the induction coil 5 rotates at a high speed with respect to the coil 6, the depth of the position of the induction coil 5 entering the coil 6 is proportional to the pedaling force of the person, as shown in Fig. 2 (a), the induction coil 5 enters The position of the coil 6 is very shallow. At this time, the human pedaling force is small, the signal of the magnetic field change is weak, and the required assistance is large; as shown in Fig. 2 (b), the induction coil 5 partially enters the coil 6, at this time, The human pedaling force is moderate, the signal of the magnetic field change is moderate, and the required assistance is moderate; as shown in Fig. 2 (c), the induction coil 5 all enters the coil 6, and at this time, the human pedaling force is small, and the signal of the magnetic field change is strong, requiring The power of the big. Therefore, detecting the signal of the change of the magnetic field caused by the change of the depth of the position of the induction coil 5 into the coil 6 can control the motor proportionally to generate the driving force, and jointly drive the electric bicycle to advance, thereby achieving the purpose of assisting.

In order to make the induction coil 5 more convenient to return to the original position when the manual drive is stopped, as shown in FIG. 1, the coil induction central shaft torque sensor of the electric bicycle of the present invention is provided with the first baffle 18 on the fixed support ring 15. The movable support ring 17 and the induction ring 5 are fixedly connected by the second baffle 21, and an elastic member 4, preferably a spring, is disposed between the first baffle 18 and the second baffle 21.

When the signal acquisition device for the electric bicycle of the present invention is used, the elastic member 4 is in a natural state without human action. When the manpower stepped down the pedal, the spiral direction of the contact surface between the active slanting block 14 and the driven slanting block 13 is designed, and the moving support ring 17 overcomes the tension of the elastic structure 4, and the axial direction of the central axis 1 is rightward. Move, the induction coil moves in the direction of the coil. When the manpower stops, the elastic member 4 returns to the natural state, thereby pushing the movable support ring to return to the original position better.

As a preferred embodiment, as shown in FIG. 1 , one or more first key grooves 19 are disposed on the inner side surface of the movable support ring 17 , and the second key groove 20 is disposed on the outer side surface of the middle shaft 1 opposite to the first key groove 19 . The axial length of the first keyway 19 is smaller than the axial length of the second keyway 20, and the portion of the first keyway 19 that is in contact with the second keyway 20 constitutes a cylindrical keyway, and one or more steel balls are actively placed in the cylindrical keyway. 16, the steel balls are preferably arranged in a row, and the first key groove 19, the second key groove 20 and the steel ball 16 together constitute a ball spline mechanism. As a preferred embodiment, as shown in FIG. 1, the first key groove 19 and the second key groove 20 have a semi-circular axial cross section, and the cylindrical key groove is a cylindrical key groove.

As a preferred embodiment, as shown in FIG. 1, the second key groove 20 has a semi-circular axial cross section, and the first key groove 19 has an axial cross section with an arcuate shape corresponding to a central angle of less than 180°, and the axis of the first key groove 19 A third baffle 22 is provided to each of the two ends.

As a preferred embodiment, as shown in FIG. 1, the left side cover 3 and the right cover 8 are fixedly mounted on the inner side surface of the five-way 7, and the coil 6 is located between the left cover 3 and the right cover 8, and the middle shaft 1 passes through A bearing 2 is mounted on the left cover 3, and the right cover 8 is connected to the outer side of the fixed support ring 15 via the second bearing 9, and the fixed support ring 15 is mounted on the outer side of the end away from the left cover 3 and the right cover 8 in a one-way beyond On the inner side of the clutch 11, the outer side of the one-way overrunning clutch 11 is connected to the crankset 10 of the electric bicycle.

As a preferred solution, the induction coil 5 is a permanent magnet.

As described above, the signal acquisition device of the electric bicycle including the coil induction center axle torque sensor rotates the active oblique block 14 by the rotation of the central shaft 1 and generates an axial displacement, thereby driving the driven oblique block 13 in the spiral structure and the ball. The axial displacement occurs under the action of the spline mechanism. (Please note that if the driven diagonal block does not axially displace, the active oblique block generates axial displacement relative to the driven oblique block. Due to the contact surface spiral structure, the rotational motion The axial displacement is generated. The axial displacement is proportional to the pedaling force. Measuring the axial displacement is the method of producing the induction coil 5 and the coil 6. Other displacement signal measurement methods can be used as long as the dynamic support can be detected. The axial displacement of the ring can be used, for example, by a linear Hall position sensor or other forms of pressure sensor, position sensor, photoelectric sensor, etc., but it is necessary to move the support ring, the fixed support ring, the active oblique block and the driven oblique block, Springs and other components can produce axial displacement. I hope the power requirements to make corresponding changes, thank you!) and then drive the induction 5 close to the coil 6, and further, the position of the signal magnetic field changes caused by the change of 6 can enter the coil 5 by measuring the induction loop to precisely control the driving force of the motor proportionally generated, the present apparatus and are inexpensive, simple process.

In summary, the signal acquisition device of the electric bicycle of the present invention can accurately determine the driving force of the motor proportionally by determining the magnitude of the human pedaling force by the sensor and collecting the signal output by the pedaling force, and the device is low in price and simple in process. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and those skilled in the art can make some modifications and improvements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the claims.

Claims

Claim

A signal acquisition device for an electric bicycle, comprising a center shaft, a five-way, a one-way overrunning clutch, characterized in that the method further comprises: capable of accurately controlling the motor proportionally by determining a magnitude of a human pedaling force and collecting a signal output by the pedaling force A sensor that generates driving force.

2. The signal acquisition device for an electric bicycle according to claim 1, wherein the sensor is a coil induction center axis torque sensor.

3. The signal acquisition device for an electric bicycle according to claim 2, wherein the coil induction center axis torque sensor comprises a coil, an induction coil, a movable support ring, a fixed support ring, an active oblique block, and a driven oblique block. , among them,

The signal collecting device of the electric bicycle according to claim 3, wherein the fixed support ring is provided with a first baffle, and the movable support ring and the induction ring are fixedly connected by the second baffle An elastic member is disposed between the first baffle and the second baffle.

The signal acquisition device for an electric bicycle according to claim 4, wherein the elastic member is a spring.

The signal acquisition device for an electric bicycle according to claim 3 or 4 or 5, wherein one or more first key grooves are disposed on an inner side surface of the movable support ring, and an outer side surface of the central shaft A second keyway is disposed opposite to the first keyway, the axial length of the first keyway is smaller than the axial length of the second keyway, and the first keyway is connected to the second keyway The touched portion constitutes a cylindrical keyway, and one or more steel balls are movably placed in the cylindrical keyway, and the first keyway, the second keyway and the steel ball together constitute the ball spline mechanism.

The signal acquisition device for an electric bicycle according to claim 6, wherein the first key groove and the second key groove have a semi-circular axial cross section, and the cylindrical key groove is a cylindrical key groove.

The signal acquisition device for an electric bicycle according to claim 6, wherein the second key groove has a semi-circular axial cross section, and the first key groove has an axial cross section with a corresponding central angle of less than 180°. The arcuate shape is formed, and the axial ends of the first key groove are respectively provided with a third baffle.

The signal acquisition device for an electric bicycle according to claim 6, wherein a left cover and a right cover are fixedly mounted on the inner side of the five-way, and the coil is located on the left cover and the right cover. The middle shaft is mounted on the left cover by a first bearing, and the right cover is connected to the outer side of the fixed support ring by a second bearing; the outer side of the one-way overrunning clutch and the crankset of the electric bicycle Connected.

The signal acquisition device for an electric bicycle according to claim 3, wherein the induction coil is a permanent magnet.