WO2013086855A1 - 与电动自行车电机一体化的力矩传感器 - Google Patents

与电动自行车电机一体化的力矩传感器 Download PDF

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Publication number
WO2013086855A1
WO2013086855A1 PCT/CN2012/078597 CN2012078597W WO2013086855A1 WO 2013086855 A1 WO2013086855 A1 WO 2013086855A1 CN 2012078597 W CN2012078597 W CN 2012078597W WO 2013086855 A1 WO2013086855 A1 WO 2013086855A1
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WIPO (PCT)
Prior art keywords
disk
displacement
disc
electric bicycle
torque sensor
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Application number
PCT/CN2012/078597
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English (en)
French (fr)
Inventor
陆永刚
Original Assignee
Lu Yonggang
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Publication date
Application filed by Lu Yonggang filed Critical Lu Yonggang
Publication of WO2013086855A1 publication Critical patent/WO2013086855A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40—Rider propelled cycles with auxiliary electric motor
    • B62M6/45—Control or actuating devices therefor
    • B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/14—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft
    • G01L3/1407—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft involving springs
    • G01L3/1428—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft involving springs using electrical transducers

Definitions

  • the present invention relates to an improvement of an electric bicycle torque sensor for testing the riding force of an electric bicycle, and more particularly to a torque sensor integrated with an electric bicycle motor. Background technique
  • the torque sensor of the known electric bicycle and the motor of the electric bicycle are respectively two independent components, and are generally classified into a chain load force sensor or a center shaft load cell, and the position of the torque sensor mounted on the electric bicycle is usually different. It is divided into bicycle chain type, chain type shaft type and rear hook type. It has the disadvantages of single mode, complicated assembly, inaccurate test, high price, consistency and poor stability.
  • the invention with patent number 00230842 The patent discloses an "electric bicycle sprocket torque sensor". The sensor is fixed at the right end of the electric bicycle. When the bicycle is riding, an ankle torque is generated and photoelectrically converted to generate electric power. The inner and outer rings of the sprocket pass through the two sides.
  • the slotted cover plate is fixed, and a reset cylindrical spring is arranged in the slot of the outer ring of the sprocket, the inner and outer gratings are respectively fixed on the inner and outer rings of the sprocket, and the side parts are provided with hinged joint shields, shields
  • the inner cavity is provided with an infrared photoelectric sub-assembly, and an elastic member and a support plate are externally provided. Due to the complicated structure of the sensor, the assembly requirements are high, and the sealing performance is poor, and water and dust are easily introduced, resulting in a decrease in measurement accuracy.
  • Another example is the German THUN electric bicycle torque sensor, which has a market price of around 80 Euros. Since it cannot be integrated with the electric bicycle motor, the torque sensor is difficult to install, and the torque cannot be stably measured and the operation is unreliable. Summary of the invention
  • An object of the present invention is to provide an electric bicycle torque sensor which is simple to install, accurate in measurement, stable in performance, dustproof and waterproof, and integrated with a motor.
  • a torque sensor integrated with an electric bicycle motor comprising: an inner disc, an outer disc, a displacement inner disc, a displacement outer disc, a force measuring spring, and a detecting disc mounted with the detecting element, wherein
  • the inner disk and the outer disk are respectively part of the rotor of the electric motor, that is, the motor rotor is divided into three parts, one of which serves as the connecting inner disk of the torque sensor, the other part serves as the connecting outer disk of the torque sensor, and the third part is the rear cavity;
  • the inner disk is fixed on the displacement inner disk, the outer disk is fixed on the displacement outer disk, and the inner disk is connected with the sprocket of the electric bicycle, the outer disk is connected with the rear cavity of the motor rotor, and the detection disk is connected with the motor stator of the electric bicycle;
  • One end is connected with the displacement inner disc, the other end of the force measuring spring is connected with the displacement outer disc, and the displacement inner disc and the displacement outer disc are embedded and mounted together;
  • each force-measuring spring is disposed on the circumference of the outer surface of the displacement outer disk at equal intervals, one end of each force-measuring spring is connected to the displacement outer disk at the position thereof, and the other end of each force-measuring spring Then connected to the equidistant spacing point on the displacement inner disc.
  • two detection elements are provided on the detection disc.
  • the inner disc, the outer disc, the inner disc, the outer disc, the outer disc, the motor stator, and the rotor of the motor are all fixed to the motor fixed shaft of the electric bicycle.
  • the connecting inner disk is connected to the connecting outer disk, and the joint is provided with a waterproof sealing unit.
  • the detecting element is any one of a Hall position detecting element, an inductive position detecting element, or a grating detecting element.
  • the sensing device disposed on the detecting disk is magnetic steel.
  • the sensing device disposed on the detecting disc is an inductive sensing device.
  • the sensing element on the detecting disc is a grating.
  • the torque sensor provided by the invention comprises an inner disk, an outer disk, a displacement outer disk, a displacement inner disk, a force measuring spring, a detecting disk and a detecting component, and is mounted on a fixed shaft of the electric motor, and the fixed shaft is mounted on the electric vehicle.
  • the force measuring component of the torque sensor ie connecting the inner disk and connecting the outer disk
  • the rotor of the motor is divided into three parts, wherein the two parts respectively serve as the connecting inner disk of the sensor and the outer disk
  • the motor stator is located in the third part of the rotor, the rear cavity.
  • the connecting inner disc and the connecting outer disc are respectively fixed on the displacement inner disc and the displacement outer disc, and the sensing inner device is respectively mounted on the displacement inner disc and the displacement outer disc, and the inner disc is connected with the sprocket of the electric bicycle, and the rider pedals the electric bicycle to drive the chain disc to rotate.
  • the chain drive chain drives the sprocket, and the sprocket drives the motor to rotate, that is, the connecting inner disk connected to the sprocket rotates, and the internal disk is connected to drive the displacement inner disk fixed on the inner disk, and the displacement inner disk pushes the force measuring spring.
  • the force-measuring spring drives the displacement outer disk connected thereto, and the displacement outer disk drives the connecting outer disk fixed thereon to rotate, and the connecting outer disk is connected with the third portion of the motor rotor, that is, the rear cavity, the rear cavity and the connecting inner disk and the connecting outer disk.
  • the magnitude of the relative displacement is proportional to the magnitude of the force measured.
  • the disc is fixed on the stator of the motor.
  • the output level of the detecting element changes, from low level to high.
  • the level change when the sensing device leaves the detecting component, returns to a low level. If a relative displacement occurs between the displacement inner disk and the displacement outer disk, the time interval of the level of the detecting component output changes accordingly, and the time interval is measured. The change, so that the magnitude of the force can be tested, that is, by detecting the relative displacement of the displacement inner disk and the displacement outer disk, the magnitude of the torque is detected, and then the voltage is output or Current signal.
  • the torque sensor of the invention is mounted on the fixed shaft of the electric motor, the inner disk of the torque sensor and the outer disk are respectively connected by the motor rotor, and the torque sensor is embedded in the motor, so that the torque sensor and the motor of the electric bicycle are combined into one, so that the electric bicycle
  • the motor also has a measuring torque function, which simplifies the structural components of the electric vehicle, is reliable in operation, simple in installation and reliable in force measurement.
  • the invention can also be used as a separate component, and only by means of the rotor of the motor, the inner disk is connected and the outer disk is connected. At this time, only the motor coil (motor stator) is removed, and the detecting disk and the detecting component are mounted on the fixed shaft of the motor. It can be used as a stand-alone torque sensor to simplify component design.
  • the torque sensor provided by the invention has the advantages of being combined with the motor casing, reliable operation, simple installation, simple and accurate detection, stable performance, waterproof and dustproof.
  • FIG. 1 is a schematic exploded view of an embodiment of the present invention
  • Figure 2 is a front elevational view showing the structure of the displacement inner disk according to an embodiment of the present invention.
  • Figure 3 is a cross-sectional view taken along line A-A of Figure 2;
  • Figure 4 is a front elevational view showing the structure of the displacement outer disk according to an embodiment of the present invention.
  • Figure 5 is a cross-sectional view taken along line A-A of Figure 4.
  • FIG. 6 is a structural view of an assembly of a displacement inner disc and a displacement outer disc according to an embodiment of the present invention
  • FIG. 7 is a structural view showing an assembly of a displacement inner disc, a displacement outer disc, and a force measuring spring according to an embodiment of the present invention
  • FIG. 8 is a front view of a finished product according to an embodiment of the present invention
  • Figure 9 is a rear view of the finished product of an embodiment of the present invention.
  • Figure 10 is a cross-sectional view taken along line A-A of Figure 8.
  • Figure 11 is a structural view showing the assembly of the inner disk, the outer disk, and the 0-type sealing ring according to an embodiment of the present invention
  • Figure 12 is a cross-sectional view taken along line A-A of Figure 11;
  • Figure 13 is a schematic view showing the working principle of an embodiment of the present invention.
  • Figure 14 is a front elevational view showing the assembly structure of the inner disc, the outer disc, the inner disc, the outer disc, and the force spring according to an embodiment of the present invention
  • Figure 15 is a rear elevational view showing the assembly structure of the inner disc, the outer disc, the inner disc, the outer disc, and the force spring according to an embodiment of the present invention
  • Figure 16 is a cross-sectional view taken along line A-A of Figure 14; detailed description
  • FIG. 1 schematically shows a torque sensor according to an embodiment of the invention, comprising a connecting inner disc 1, a connecting outer disc 2, a displacement inner disc 3, a displacement outer disc 4, a force measuring spring 5, and a detecting element 7 mounted thereon.
  • the detecting disc 6, wherein the connecting inner disc 1, the connecting outer disc 2, the displacement inner disc 3, the displacement outer disc 4, the detecting disc 6, the motor stator 8 and the motor rotor 10 are all fixed on the motor fixed shaft 11 of the electric bicycle.
  • Two detecting elements 71, 71 are fixed to the detecting disc 6.
  • the detecting elements 71, 72 are any one of a Hall position detecting element, an inductance position detecting element, or a grating detecting element.
  • the inner disk 1 and the outer disk 2 are respectively part of the rotor 10 of the electric motor, that is, the motor rotor 10 is divided into three parts, one of which serves as a torque sensor for connecting the inner disk 1 and the other part as a torque sensor for connecting the outer disk 2,
  • the three parts are the back cavity 9.
  • the connecting inner disc 1 is fixed on the displacement inner disc 3
  • the connecting outer disc 2 is fixed on the displacement outer disc 4
  • the connecting inner disc 1 is connected with the sprocket of the electric bicycle
  • the connecting outer disc 2 is fixed on the third portion of the electric motor rotor 10, that is, the rear chamber 9.
  • the detection disc 6 is connected to the motor stator 8 of the electric bicycle.
  • the structures of the displacement inner disk 3 and the displacement outer disk 4 are as shown in Figs. 2, 3, and 4 and 5, respectively.
  • the detecting elements 71, 72 are used with the Hall position detecting elements, and accordingly, the corresponding inner disk is mounted. 3 and the sensing device on the outer disc 4 is magnetic steel.
  • the displacement inner disk 3 is correspondingly provided with a magnetic steel mounting hole 34 on which the detecting magnetic steel is mounted, and the magnetic steel mounted on the displacement inner disk 3 corresponds to a detecting element 71 on the detecting disk 6, and the displacement outer disk 4 is correspondingly
  • a magnetic steel mounting hole 44 for mounting the detecting magnetic steel is provided, and the magnetic steel mounted on the displacement outer disk 4 corresponds to the other detecting element 72 on the detecting disk 6.
  • the displacement inner disk 3 and the displacement outer disk 4 are fitted together, and the force measuring spring 5 is mounted at a relative position.
  • four force measuring springs 5 are disposed for mounting the force measuring spring 5, and four spring mounting cavities 41 are disposed at equal intervals on the circumference of the outer surface of the outer disk 4, and a force is placed in each spring mounting cavity 41.
  • the spring 5 and the displacement inner disc 3 are correspondingly provided with four fixing bosses 31.
  • the displacement inner disc 3 and the displacement outer disc 4 are fitted together as shown in FIG. 6, and the force measuring spring 5 is fixed in the spring mounting cavity 41, as shown in FIG. Shown.
  • Fig. 8, Fig. 9, and Fig. 10 show the structure after the assembly of this embodiment is completed.
  • the connecting inner disc 1 is provided with two 0-type waterproof sealing rings 12 and 13 as waterproof sealing units.
  • the connecting inner disc 1 is mounted in the connecting inner disc mounting seat 21 connected to the outer disc 2, the 0-type waterproof sealing rings 12, 13 can Effectively ensure the waterproof sealing effect between the inner disc 1 and the outer disc 2, as shown in Figures 11 and 12.
  • the magnetic steel is installed in the magnetic steel mounting hole 34 of the displacement inner disc 3, and the displacement of the inner disc 3 is driven by the force measuring spring 5 to rotate the outer disc 4, and the outer disc is displaced.
  • 4 is fixed on the connecting outer disk 2
  • the connecting outer disk 2 is fixed on the rear cavity 9 of the motor rotor 10, and the rear cavity 9 rotates to drive the rear wheel of the electric vehicle to rotate.
  • the displacement inner disc 3 and the displacement outer disc 4 will produce a relative displacement according to the magnitude of the force on the sprocket, and the displacement amount is proportional to the magnitude of the force measurement.
  • FIG. 15 and FIG. 16 are schematic diagrams showing the assembly structure of the sensor-connected inner disk 1, the outer disk 2 and the displacement inner disk 3, the displacement outer disk 4, and the force measuring spring 5.
  • the sensor of the invention can also be connected to the inner disk 1 and the outer disk 2 only by means of the motor casing. At this time, only the motor coil, that is, the motor rotor 10, is removed, and the displacement inner disk 3, the displacement outer disk 4, the force measuring spring 5 and the detecting element are mounted. 71, 72 can be used as independent torque sensor. In this embodiment, the sensor and the motor are still independent components, but it can meet different application scenarios, simplify the design of components, save costs, and improve the internal management efficiency of the company.
  • the detecting elements 71, 72 can also use an inductive position detecting element or a grating detecting element.
  • the sensing device on the detecting disc 6 should be an inductive sensing device accordingly;
  • the sensing means on the detecting disc 6 should accordingly be a grating.
  • the corresponding sensing device is mounted on the detecting disc 6, and the corresponding mounting structure adjustment must be made to the detecting disc 6. Such mounting structure adjustment is well known to those skilled in the art and will not be described herein.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

一种与电动自行车电机一体化的力矩传感器，包括连接内盘（1）、连接外盘（2）、位移内盘（3）、位移外盘（4）、测力弹簧（5）以及安装有检测元件的检测圆盘（6），其中，所述的连接内盘（1）、连接外盘（2）分别为电动车电机转子（10）的一部分；连接内盘（1）固定在位移内盘（3）上，连接外盘（2）固定在位移外盘（4）上，并且所述的连接内盘（1）与电动自行车的链轮连接，所述的连接外盘（2）与电机转子（10）的后腔（9）连接，所述的检测圆盘（6）与电动自行车的电机定子（8）连接；所述的测力弹簧（5）一端与位移内盘（3）连接，测力弹簧（5）的另一端与位移外盘（4）连接，位移内盘（3）和位移外盘（4）相嵌安装于一起；所述的位移内盘（3）和位移外盘（4）上分别设有感应器件。该力矩传感器具有与电机外壳结合、运行可靠、安装简单、检测简单准确、性能稳定、防水防尘的特点。

Description

与电动自行车电机一体化的力矩传感器 技术领域
本发明涉及一种用于测试电动自行车骑行力的电动自行车力矩传感器的改 进， 尤其涉及与电动自行车电机一体化的力矩传感器。 背景技术
目前， 公知的电动自行车的力矩传感器和电动自行车的电机分别为两个独 立的部件， 且一般分为链盘测力传感器或者中轴测力传感器， 根据力矩传感器 在电动自行车上安装的位置不同通常分为自行车链盘式、 链盘中轴式、 后勾爪 式， 具有方式单一， 装配复杂， 测试不精确、 价格较高、 一致性和稳定性不好 的缺点，如专利号为 00230842的发明专利公开的 "一种电动自行车链轮力矩传 感器"，这种传感器固定在电动自行车中轴右端，骑行时产生脚蹬力矩并经光电 转换产生电量， 它的链轮内、 外圈通过两侧的带槽的盖板固定， 链轮外圈的卡 槽内设置复位圓柱弹簧， 内、 外光栅分别固定在链轮内、 外圈上， 其侧部设有 铰联配合的护罩， 护罩内腔设有红外光电分组件， 外设有弹性件和支承板。 由 于这种传感器结构复杂， 对装配要求高， 且密封性能差， 容易进水及灰尘， 导 致测量精度下降。 又如德国 THUN电动自行车力矩传感器， 其市场价格在 80 欧元左右， 由于均不能与电动自行车电机一体化， 导致力矩传感器安装困难， 且无法稳定测量力矩、 运行不可靠。 发明内容
本发明的目的是提供一种安装简单、 测量准确、 性能稳定、 防尘防水且与 电机合为一体的电动自行车力矩传感器。
根据本发明的一个方面， 公开了与电动自行车电机一体化的力矩传感器， 包括连接内盘、 连接外盘、 位移内盘、 位移外盘、 测力弹簧以及安装有检测元 件的检测圓盘， 其中， 所述的连接内盘、 连接外盘分别为电动车电机转子的一 部分， 即将电机转子分成三个部分，其中一个部分作为力矩传感器的连接内盘， 另一个部分作为力矩传感器的连接外盘， 第三部分为后腔； 连接内盘固定在位 移内盘上， 连接外盘固定在位移外盘上， 并且连接内盘与电动自行车的链轮连 接，连接外盘与电机转子的后腔连接，检测圓盘与电动自行车的电机定子连接； 测力弹簧一端与位移内盘连接， 测力弹簧的另一端与位移外盘连接， 位移内盘 和位移外盘相嵌安装于一起； 位移内盘和位移外盘上分别设有感应器件。
在一些实施方式中，位移外盘表面圓周上等距离间隔地设置四个测力弹簧， 每个测力弹簧的一端与其所在位置的位移外盘连接， 而每个测力弹簧的另一端 则与位移内盘上的等距离间隔点连接。
在一些实施方式中， 检测圓盘上设有两个检测元件。
在一些实施方式中， 连接内盘、 连接外盘、 位移内盘、 位移外盘、 检测圓 盘、 电机定子以及电机转子均固定在电动自行车的电机固定轴上。
在一些实施方式中， 连接内盘与连接外盘相连， 连接处设置有防水密封单 元。
在一些实施方式中， 检测元件为霍尔位置检测元件、 电感位置检测元件或 者光栅检测元件中的任一种。
在一些实施方式中， 当检测元件是霍尔位置检测元件时， 检测圓盘上设置 的感应器件是磁钢。
在一些实施方式中， 当检测元件是电感位置检测元件时， 检测圓盘上设置 的感应器件是电感感应器件。
在一些实施方式中， 当检测元件是光栅检测元件时， 检测圓盘上的感应器 件是光栅。
本发明提供的力矩传感器， 由连接内盘、 连接外盘、 位移外盘、 位移内盘、 测力弹簧、 检测圓盘以及检测元件构成， 其装配在电动车电机的固定轴上， 该 固定轴安装于电动车的后置电机中。 本发明力矩传感器的创新构思在于： 力矩 传感器的测力部件（即连接内盘、 连接外盘）通过电机转子实现， 即将电机转 子分成三部分， 其中两个部分分别作为传感器的连接内盘和连接外盘， 而电机 定子则位于转子的第三部分即后腔中。 将连接内盘、 连接外盘分别固定在位移 内盘和位移外盘上， 位移内盘和位移外盘上分别安装感应器件， 连接内盘与电 动自行车的链轮相连， 骑行者脚踩电动车脚踏之后带动链盘转动， 链盘带动链 条带动链轮， 链轮又带动电机转动， 即带动与链轮相连的连接内盘转动， 连接 内盘运转的同时带动固定于连接内盘上的位移内盘运转， 位移内盘推动测力弹 簧， 测力弹簧又带动与之连接的位移外盘运转， 位移外盘再带动固定在其上的 连接外盘转动， 而连接外盘与电机转子的第三部分即后腔连接， 该后腔和连接 内盘、 连接外盘组成一个腔体， 通过轴承固定于电机固定轴上， 通过安装于电 机转子上的辐条使电动车的后轮转动， 脚踩时位移内盘和位移外盘之间的测力 弹簧会根据链轮的力的大小产生相对位移， 该相对位移的大小同测力大小成正 比， 检测圓盘固定在电机的定子上， 当安装于位移内盘上的感应器件和位移外 盘上的感应器件通过各自对应的检测元件时， 会使检测元件的输出电平发生变 化， 从低电平到高电平变化， 感应器件离开检测元件时， 又恢复成低电平， 如 果位移内盘和位移外盘之间产生相对位移时， 检测元件输出的电平的时间间隔 会相应产生变化， 测出该时间间隔的变化， 从而能测试出力的大小， 即通过测 试位移内盘和位移外盘的相对位移检测力矩的大小， 然后对应地输出电压或者 电流信号。
本发明力矩传感器装配于电动车电机固定轴上， 力矩传感器的连接内盘和 连接外盘分别借助于电机转子， 力矩传感器嵌入电机之中， 使得电动自行车的 力矩传感器和电机合二为一， 使得电动自行车电机除了正常的电机功能外， 还 具有测量力矩功能， 既简化了电动车结构部件， 又运行可靠、 安装简单、 测力 可靠。 本发明也可以作为一个独立的部件， 而仅借助电机转子作成连接内盘和 连接外盘， 这时只需把电机线圈 （电机定子）取下， 并在电机固定轴装上检测 圓盘以及检测元件即可作为独立的力矩传感器， 简化了零部件设计。
本发明提供的力矩传感器， 具有与电机外壳结合， 运行可靠， 安装简单， 检测简单准确， 性能稳定， 防水防尘的特点。 附图说明
图 1是本发明一实施方式结构分解示意图；
图 2是本发明一实施方式位移内盘结构正视图；
图 3是图 2 中 A-A向剖视图；
图 4是是本发明一实施方式位移外盘结构正视图；
图 5是图 4 中 A-A向剖视图；
图 6是本发明一实施方式位移内盘、 位移外盘装配结构图
图 7是本发明一实施方式位移内盘、 位移外盘、 测力弹簧装配结构图； 图 8是本发明一实施方式成品正视图；
图 9是本发明一实施方式成品后视图；
图 10是图 8 中 A-A向剖视图；
图 11是本发明一实施方式连接内盘、 连接外盘、 0型密封圈装配结构图； 图 12是图 11中 A-A向剖视图；
图 13是本发明一实施方式工作原理示意图；
图 14是本发明一实施方式连接内盘、 连接外盘、 位移内盘、 位移外盘、 测 力弹簧装配结构正视图；
图 15是本发明一实施方式连接内盘、 连接外盘、 位移内盘、 位移外盘、 测 力弹簧装配结构后视图；
图 16是图 14中 A-A向剖视图。 具体实施方式
下面结合附图对本发明作进一步详细的说明。
如图 1示意性的显示了根据本发明一实施方式的力矩传感器， 其包括连接内盘 1、 连接外盘 2、 位移内盘 3、 位移外盘 4、 测力弹簧 5以及安装有检测元件 7 的检测圓盘 6, 其中连接内盘 1、 连接外盘 2、 位移内盘 3、 位移外盘 4、 检测 圓盘 6、 电机定子 8以及电机转子 10均固定在电动自行车的电机固定轴 11上。 检测圓盘 6上固定有两个检测元件 71、 71。 检测元件 71、 72为霍尔位置检测 元件、 电感位置检测元件或者光栅检测元件中的任一种。 其中连接内盘 1、 连 接外盘 2分别为电动车电机转子 10的一部分，即将电机转子 10分成三个部分， 其中一个部分作为力矩传感器的连接内盘 1 , 另一个部分作为力矩传感器的连 接外盘 2, 第三部分为后腔 9。 连接内盘 1 固定在位移内盘 3上， 连接外盘 2 固定在位移外盘 4上， 并且连接内盘 1与电动自行车的链轮连接， 连接外盘 2 固定在电机转子 10的第三部分即后腔 9上，检测圓盘 6与电动自行车的电机定 子 8连接。
位移内盘 3和位移外盘 4的结构分别如图 2、 图 3以及图 4、 图 5所示， 本 实施例中检测元件 71、 72釆用霍尔位置检测元件， 因此， 相应的安装在位移内 盘 3和位移外盘 4上的感应器件为磁钢。 这时， 位移内盘 3上相应地设置有安 装检测磁钢的磁钢安装孔 34,安装在位移内盘 3上的磁钢和检测圓盘 6上的一 个检测元件 71对应，位移外盘 4上相应地设置安装检测磁钢的磁钢安装孔 44, 安装在位移外盘 4上的磁钢和检测圓盘 6上的另一个检测元件 72对应。位移内 盘 3和位移外盘 4嵌装在一起， 并在相对位置安装测力弹簧 5。 本实施例传感 器中设置了四个测力弹簧 5 ,为安装测力弹簧 5 ,位移外盘 4表面圓周上等距离 间隔地设置四个弹簧安装腔 41 ,每个弹簧安装腔 41内放置一个测力弹簧 5 ,位 移内盘 3上相应地设置四个固定凸台 31 ,位移内盘 3和位移外盘 4如图 6所示 嵌装在一起， 测力弹簧 5被固定在弹簧安装腔 41内， 如图 7所示。每个测力弹 簧 5的一端与其所在位置的位移外盘 4连接， 而每个测力弹簧 5的另一端则与 位移内盘 3上的等距离间隔点连接。 图 8、 图 9、 图 10所示是本实施例组装完 成后结构示意。
连接内盘 1上设置有作为防水密封单元的两个 0型防水密封圈 12和 13 , 当连接内盘 1安装在连接外盘 2上的连接内盘安装座 21内时， 0型防水密封 圈 12、 13能有效保证连接内盘 1和连接外盘 2之间的防水密封效果， 如图 11、 12。
图 13同时示出了本实施例力矩传感器测力的工作原理：位移内盘 3上磁钢 安装孔 34内安装有磁钢， 位移内盘 3转动会通过测力弹簧 5推动位移外盘 4 转动，位移外盘 4固定于连接外盘 2上，连接外盘 2则固定于电机转子 10的后 腔 9上， 后腔 9转动带动电动车后轮转动。 转动时， 位移内盘 3和位移外盘 4 会才艮据链轮上的力的大小产生相对位移， 该位移量的大小同测力大小成正比。 根据霍尔元件检测原理， 当安装于位移内盘 3和位移外盘 4上的磁钢通过检测 元件 71、 72时， 会使检测元件 71、 72的输出电平发生变化， 从低电平到高电 平变化， 磁钢离开检测元件 71、 72时， 又恢复成低电平， 如果位移内盘 3和位 移外盘 4发生位移时，检测元件 71、 72上相对应的输出的电平的时间间隔会相 应产生变化， 从而能测试出力的大小。 图 14、 图 15、 图 16是传感器连接内盘 1、 连接外盘 2和位移内盘 3、 位移外盘 4、 测力弹簧 5的装配结构示意图。
本发明传感器也可以仅借助电机外壳做成连接内盘 1和连接外盘 2, 这时 只需把电机线圈即电机转子 10取下， 装上位移内盘 3、 位移外盘 4、 测力弹簧 5以及检测元件 71、 72即可作为独立的力矩传感器， 这种实施方式中， 传感器 和电机仍然分别为独立的部件， 但是可以符合不同的应用场合、 简化零部件的 设计， 节约成本， 提高公司内部管理效率。
本发明力矩传感器中检测元件 71、72也可以釆用电感位置检测元件或者光 栅检测元件， 当釆用电感位置检测元件时， 检测圓盘 6上的感应器件相应地应 为电感感应器件； 当釆用光栅检测元件时， 检测圓盘 6上的感应器件相应地应 为光栅。 这两种情况下， 检测圓盘 6上为安装相应的感应器件， 必须对检测圓 盘 6作相应的安装结构调整， 这种安装结构调整为本领域技术人员所熟知， 在 此不再赘述。

Claims

权利要求书
1. 与电动自行车电机一体化的力矩传感器， 其特征在于： 所述的力矩传感 器包括连接内盘（1)、 连接外盘（2)、 位移内盘 （3)、 位移外盘（4)、 测力弹 簧（5) 以及安装有检测元件的检测圓盘（6), 其中， 所述的连接内盘（1)、 连 接外盘（2)分别为电动车电机转子（ 10)的一部分， 即将所述的电机转子（ 10) 分成三个部分， 其中一个部分作为所述的力矩传感器的连接内盘（1 ), 另一个 部分作为所述的力矩传感器的连接外盘 （2), 第三部分为后腔（9); 所述的连 接内盘（1 )固定在位移内盘（3)上， 所述的连接外盘（2)固定在位移外盘（4) 上， 并且所述的连接内盘（ 1 )与电动自行车的链轮连接， 所述的连接外盘（2) 与电机转子（10) 的后腔（9)连接， 所述的检测圓盘（6)与电动自行车的电 机定子（8)连接； 所述的测力弹簧（5)—端与位移内盘（3)连接， 测力弹簧
(5) 的另一端与位移外盘 （4)连接， 位移内盘（3)和位移外盘（4)相嵌安 装于一起； 所述的位移内盘（3)和位移外盘（4)上分别设有感应器件。
2. 根据权利要求 1所述的与电动自行车电机一体化的力矩传感器， 其特征 在于： 所述的位移外盘（4)表面圓周上等距离间隔地设置四个测力弹簧（5), 每个测力弹簧（5) 的一端与其所在位置的位移外盘（4)连接， 而每个测力弹 簧（5) 的另一端则与位移内盘（3)上的等距离间隔点连接。
3. 根据权利要求 1所述的与电动自行车电机一体化的力矩传感器， 其特征 在于： 所述的检测圓盘（6)上设有两个检测元件（71、 72)。
4. 根据权利要求 1所述的与电动自行车电机一体化的力矩传感器， 其特征 在于： 所述的连接内盘（1)、 连接外盘 （2)、 位移内盘（3)、 位移外盘（4)、 检测圓盘（6)、 电机定子（8)以及电机转子（ 10)均固定在电动自行车的电机 固定轴（11 )上。
5. 根据权利要求 1所述的与电动自行车电机一体化的力矩传感器， 其特征 在于： 所述的连接内盘（1 )与连接外盘（2)相连， 连接处设置有防水密封单 元。
6. 根据权利要求 1所述的与电动自行车电机一体化的力矩传感器， 其特征 在于： 所述的检测元件为霍尔位置检测元件、 电感位置检测元件或者光栅检测 元件中的任一种。
7. 根据权利要求 6所述的与电动自行车电机一体化的力矩传感器， 其特征 在于： 当所述的检测元件是霍尔位置检测元件时， 所述的检测圓盘（6)上设置 的感应器件是磁钢。
8. 根据权利要求 6所述的与电动自行车电机一体化的力矩传感器， 其特征 在于： 当所述的检测元件是电感位置检测元件时， 所述的检测圓盘（6)上设置 的感应器件是电感感应器件。
9. 根据权利要求 6所述的与电动自行车电机一体化的力矩传感器， 其特征 在于： 当所述的检测元件是光栅检测元件时， 所述的检测圓盘（6 )上的感应器 件是光栅。
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