WO2019000730A1 - 一种压力测量装置 - Google Patents

一种压力测量装置 Download PDF

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Publication number
WO2019000730A1
WO2019000730A1 PCT/CN2017/107312 CN2017107312W WO2019000730A1 WO 2019000730 A1 WO2019000730 A1 WO 2019000730A1 CN 2017107312 W CN2017107312 W CN 2017107312W WO 2019000730 A1 WO2019000730 A1 WO 2019000730A1
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WO
WIPO (PCT)
Prior art keywords
bearing
mounting position
force sensor
measuring device
pressure measuring
Prior art date
Application number
PCT/CN2017/107312
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English (en)
French (fr)
Inventor
高峰
Original Assignee
太仓市荣驰电机有限公司
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Application filed by 太仓市荣驰电机有限公司 filed Critical 太仓市荣驰电机有限公司
Publication of WO2019000730A1 publication Critical patent/WO2019000730A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/04—Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/26—Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0052—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to impact

Definitions

  • the invention belongs to the field of sensors, and in particular relates to a pressure measuring device.
  • Pressure sensors are one of the most commonly used sensors. According to the principle, they can be divided into strain gauges and springs.
  • existing pressure sensors usually require that the measured object and the sensor are relatively fixed. In the case of moving the measured object, the traditional The sensor can't measure well. For example, the contact of the strain gauge needs wire connection. When the shaft rotates, it is usually impossible to use or use the slip ring to connect. However, at this time, the life of the sensor will be affected by the construction of the slip ring, etc.
  • the present invention provides a pressure measuring device for measuring the pressure caused by a fixed component by externally applying a sensor and utilizing a rotating or moving component, in an indirect measurement manner, Solve the problem that the sensor can't be arranged or the life is limited in the existing direct measurement method.
  • a pressure measuring device includes a bearing, a bearing sleeve and a force sensor.
  • the bearing is disposed in the bearing sleeve, and the force sensor is disposed outside the outer ring of the bearing or disposed on the bearing sleeve.
  • the bearing sleeve is provided with a bearing mounting position and a force sensor mounting position, and the bearing mounting position and the force sensor mounting position are respectively disposed on both sides of the partition plate or the bearing mounting position and the force sensor mounting position are directly connected.
  • a force sensor is disposed on the bearing, a force sensor is disposed on the outer side of the outer ring of the bearing, the outer ring is further provided with a key groove, and the outer ring is disposed at a corresponding position of the bearing sleeve The keyway that the keyway matches.
  • the bearing is also provided with a support frame and a dust cover.
  • the bearing mounting position is a circular hole
  • the key groove is arranged opposite to the force sensor mounting position
  • the force sensor mounting position is a groove shape
  • the groove-shaped force sensor mounting position is connected with the round hole of the bearing mounting position. Cut or set with a circular chamfer.
  • the round hole of the bearing mounting position is not less than 181° to the bearing.
  • the bearing mounting position is a round hole
  • a force sensor mounting position is arranged outside the bearing mounting position, and the force sensor mounting position and the bearing mounting position are connected by the partition plate, and the sensor mounting position is a slot or a hole.
  • the sensor mounting position is arranged in an arc shape on the side adjacent to the bearing mounting position, and is disposed coaxially with the bearing mounting position, and the force sensor is disposed on the partition plate.
  • the partition plate is integrally formed with the bearing sleeve or inserted into the bearing sleeve as a plug-in plate, and the width of the force sensor mounting position is the same as the diameter of the bearing mounting position.
  • the force sensor is a strain gauge.
  • circuit board is further included, and the circuit board is externally disposed or disposed in the force sensor mounting position, and the circuit board is connected to the force sensor.
  • the bearing is one of a deep groove ball bearing, a roller bearing, a thrust bearing or a self-aligning bearing.
  • the bearing clearance is not more than 0.5 mm.
  • a center shaft torque sensor using the pressure measuring device of the present invention is a center shaft torque sensor using the pressure measuring device of the present invention.
  • the indirect measurement method is used to measure the pulling force, and the structure is simple and the cost is low.
  • FIG. 1 is a schematic structural view of a first embodiment of a pressure measuring device according to the present invention.
  • FIG. 2 is a schematic structural view of a pressure measuring device having an integral bearing sleeve according to the present invention
  • FIG. 3 is a schematic structural view of a second embodiment of a pressure measuring device according to the present invention.
  • Figure 4 is a schematic view showing the structure of a bearing of a pressure measuring device of the present invention.
  • FIG. 5 is a schematic structural view of a pressure measuring device applied to a bicycle center shaft according to the present invention.
  • Figure 6 is a schematic view showing a bearing structure of a pressure measuring device of the present invention.
  • a pressure measuring device comprises a bearing 1, a bearing sleeve 2 and a force sensor 3, the bearing 1 is arranged in the bearing sleeve 2, the force sensor 3 is arranged outside the outer ring 7 of the bearing 1 or on the bearing sleeve 2, the bearing sleeve 2
  • the bearing mounting position and the force sensor 3 mounting position are provided, and the bearing mounting position and the force sensor 3 mounting position are respectively disposed on both sides of the partition plate or the bearing mounting position and the force sensor 3 mounting position are directly connected.
  • a pressure measuring device comprises a bearing 1, a bearing sleeve 2 and a force sensor 3, the bearing 1 is disposed in the bearing sleeve 2, the force sensor 3 is disposed on the bearing sleeve 2, and the bearing sleeve 2 is provided with a bearing mounting position 12 and a force sensor 3
  • the mounting position, the bearing mounting position 12 and the force sensor 3 mounting position are respectively arranged on both sides of the partition, specifically:
  • the bearing sleeve 2 can be of any shape, and the bearing sleeve 2 is designed with an elliptical hole or other irregular curved hole, and a circular bearing mounting position 12 and a sensor mounting position 5 are formed through the partition plate.
  • the bearing mounting position 12 and the sensor mounting position 5 are separated by a partition, the partition is curved, the outer diameter of the partition is larger than the outer diameter of the bearing 1, and the partition can be inserted into the bearing sleeve 2 and corresponding to the bearing sleeve 2 Partially closely matched, the partition and the bearing sleeve 2 together form a circular bearing mounting position 12.
  • the partition is a uniform curved plate of equal thickness.
  • the bearing 1 is provided in the bearing mounting position 12.
  • the bearing 1 is a common bearing 1, such as a deep groove ball bearing 1, a roller bearing 1, a thrust bearing 1, a self-aligning bearing 1, etc., and is not limited herein.
  • the bearing sleeve 2 and the partition plate are further formed with another sensor mounting position 5 for arranging the force sensor 3 and the placement circuit board 4, wherein the force sensor 3 is disposed outside the partition plate and is disposed close to the surface of the partition plate, and the force sensor 3 can be The strain gauge or the spring type pressure sensor 3 is selected.
  • the force sensor 3 is a strain gauge. It should be noted that in order to obtain better performance, the width of the mounting position of the force sensor 3 is the same as the outer diameter of the bearing 1, and the edge of the force sensor 3 is provided with a circular chamfer to reduce the stress concentration phenomenon, resulting in failure of the pressure measuring device.
  • the circuit board 4 can be disposed in the sensor mounting position 5, and the circuit board 4 is an amplifier or other signal processing unit. Of course, the circuit board 4 can also be externally connected and connected to the strain gauges disposed on the partition plate by wires.
  • the two ends of the partition should be left at an appropriate length and well fixed with the bearing sleeve 2.
  • the partition plate and the bearing sleeve 2 are integrally designed, and can be directly manufactured by casting cutting or the like, which simplifies the manufacturing process and reduces the cost.
  • a pressure measuring device comprising a bearing 1, a bearing sleeve 2 and a force sensor 3, the bearing 1 is disposed in the bearing sleeve 2, the force sensor 3 is disposed outside the bearing 1, and the bearing sleeve 2 is provided with a bearing mounting position 12 and a force sensor 3
  • the mounting position, bearing mounting position 12 and force sensor 3 mounting position are not directly connected through the partition, specifically:
  • the bearing sleeve 2 can be of any shape, and the bearing sleeve 2 is designed with an elliptical hole or other irregular curved hole, which is a circular bearing mounting position 12 and a sensor. Mounting bit 5 is composited and formed directly.
  • the bearing mounting position 12 is a majority of a circle, the bearing mounting position 12 can form a semi-clad structure for the bearing 1, and a bearing sleeve key groove 9-1 is disposed on the bearing mounting position 12, and the bearing sleeve key groove 9-1 can be disposed at Any position of the bearing mounting position 12, preferably, the keyway 9 is disposed opposite the opening of the bearing mounting position 12, and the angle a formed by the two end points of the bearing mounting position 12 in contact with the bearing 1 to the center of rotation of the bearing 1 is covered Angle, in order to ensure good fixing of the bearing 1, the bearing covering angle a should be greater than 180°, for example, in the present embodiment, the angle is 220°. Of course, different bearing covering angles can be set according to different sensor design requirements.
  • the sensor mounting position 5 is directly connected with the bearing mounting position 12, as shown in Figure 3, the two sides of the sensor mounting position 5 and the bearing mounting position 5 The ends of the two sides are tangent. Of course, depending on the design requirements, they may not be tangent to the two end points of the bearing mounting position 12, but arc chamfers should be set to avoid stress concentration at the intersection.
  • both ends of the bearing mounting position 12 being directly connected to both sides of the sensor mounting position 5
  • both ends of the bearing mounting position 12 are provided in the bearing mounting position 12.
  • deep groove ball bearing 1, roller bearing 1, thrust bearing 1, self-aligning bearing 1, etc. are not limited herein.
  • the bearing 1 in this embodiment is a torque bearing 1, and the torque bearing 1 includes an inner ring 6, an outer ring 7, and a rolling body 8, and the inner ring 6 and the outer ring 7 of the bearing 1 are the same.
  • the shaft is connected, and the rolling element 8 is arranged annularly equidistantly between the inner ring 6 and the outer ring 7 of the bearing 1.
  • the outer ring 7 of the bearing 1 is fitted with a force sensor 3, and the outer ring 7 is also provided with a key groove 9.
  • the keyway 9 is disposed opposite the force sensor 3.
  • the keyway 9 can also be disposed at an angle to the force sensor 3.
  • the bearing 1 can also add a support frame and a dust cover, and the shaft
  • the bearing 1 is installed with a certain clearance to ensure that the outer ring 7 of the bearing 1 has a reasonable shape variable, and the clearance is not more than 0.5 mm.
  • the torque bearing 1 adjusts the sensitivity and range of the force sensor 3 by adjusting the thickness of the outer ring 7 to achieve different stiffnesses. In addition, specific measurement capabilities can also be obtained by adjusting the thickness and extension of the lip 11.
  • the force sensor 3 is a strain gauge which is disposed on the outer ring 7 of the bearing 1 and closely fits the outer ring 7 of the bearing 1. The output of the strain gauge is connected to the circuit board 4, which is an amplifier or other signal processing unit.
  • the circuit board 4 is disposed in the sensor mounting position 5. Of course, the circuit board 4 can also be externally connected to the force sensor 3 through a wire. .
  • the force sensor 3 should be placed at the intersection of the bearing mounting position 12 and a sensor mounting position 5, and the force sensor 3 should be at the center of the intersection.
  • the force sensor 3 should not be covered by any one of the bearing mounting positions 12, and therefore, the extended length of the lip 11 should not cover the strain gauge.
  • the figure shows the application of the pressure measuring device on the bicycle central axis torque sensor.
  • the bearing sleeve 2 and the end cap of the torque middle shaft are integrally manufactured, and the bearing mounting position 12 and the sensor mounting position 5 are arranged on the end cover.
  • the bearing mounting position 12 is in an arc state, the bearing mounting position 12 is connected with a sensor mounting position 5, the bearing mounting position 12 is directly connected to the sensor mounting position 5, and the sensor mounting position 5 is tangent to the end of the bearing mounting position 12, the bearing
  • the angle of the connection between the two ends of the mounting position 12 and the rotation axis of the bearing 1 is 220°, and the bearing mounting position 12 is further provided with a key groove 9 in which the bearing 1 is disposed, and the bearing 1 is provided with a bearing 1
  • the keyway 9, the keyway 9 of the bearing 1 is aligned with the bearing sleeve keyway 9-1 of the bearing mounting position 12 and is connected by a key to ensure the rotation of the outer ring 7 of the bearing 1 is fixed, and the outer ring 7 of the bearing 1 is fitted with a pressure strain gauge for use.
  • the output of the pressure strain gauge is connected to the wiring board 4, which is disposed in the sensor mounting position 5.
  • One end of the end cap is provided with a threaded connection 10 which is connected to the bicycle five-way.
  • a bearing is disposed in the bearing 1 of the end cap, and the crankshaft and the crank are disposed on the shaft.
  • the pressure measuring device should be arranged laterally, ie the line between the center of the pressure measuring device and the center of the bearing 1 and the ground level.
  • the bicycle center shaft torque sensor can also be subjected to pressure measurement using the scheme of Embodiment 1.
  • the pressure measuring device When used as a torque measurement, the pressure measuring device works as follows: when working, when a person steps on the pedal, the crankshaft and the crankset are rotated by the crank, and the crankshaft drives the wheel to rotate through the chain. Due to the running resistance of the wheel, the chain is tightened and the chain exerts a rearward pulling force on the crankset, which is applied to the bearing 1 through the shaft, due to the lateral arrangement of the force sensor 3 of the bearing 1, when the bearing 1 is subjected to a backward pressure The pressure acts on the outer ring 7 of the bearing 1 on the side of the sensor, so that the outer ring 7 of the bearing 1 is subjected to tensile force, causing deformation, and the pressure is measured by changing the resistance of the strain gauge.
  • the input torque can be obtained by conversion or
  • the tension value can be directly used as a control signal of the vehicle.
  • the vehicle is stationary or coasting, since the chain is not subjected to force, no backward pulling force is generated.
  • the pressure of the bearing 1 is caused by the person. Underneath, no backward pulling force is generated.
  • the lateral deformation of the bearing 1 is small, and the output signal is small or no signal, which serves as a basis for discriminating the vehicle's assist.
  • the pressure measuring device can also be used as a source of sensor data for riding power meters or physical energy consumption. And suitable for the front or rear drive hub motor.
  • This embodiment is an application of the pressure measuring device as a load cell.
  • the sensor of the first embodiment or the second embodiment is taken as an example.
  • the bearing sleeve 2 is provided with a bearing 1 , the inner ring 6 of the bearing 1 is sleeved with a shaft, and the bearing sleeve 2 can be fixed with the base or the housing.
  • the force sensor is arranged on the bearing sleeve 2 or the bearing 1 Install one side down to the ground.
  • the output of the force sensor is connected to an amplifier or processing circuit and output.
  • the shaft transmits pressure to the bearing 1, and the outer ring 7 or the diaphragm of the bearing 1 is deformed by pressure, and the strain gauge collects the deformation and converts it into a pressure signal output, compared with the conventional one.
  • the static measurement method the measurement advantage of the sensor is that it can perform static pressure measurement like a traditional sensor, and can also measure during the movement, such as setting the sensor on the conveyor belt, the roller driving the shaft transmission, and the conveyor belt
  • the pressure on the upper part is measured by applying pressure to the bearing 1 through the roller and the shaft.
  • the operation of the shaft is not affected, and the real-time measurement of the working process of the conveyor belt is realized.
  • the pressure measuring device can also be used for a car
  • the pressure measurement at the axle, etc. is used to measure the amount of the vehicle and the impact force during driving.
  • the indirect measurement method is used to measure the pulling force, and the structure is simple and the cost is low.
  • the motor can be installed by concentric coaxial or one side
  • the speed reduction mechanism can be decelerated by planetary gears or other gear and chain deceleration structures
  • the central shaft can adopt a single-axis structure or a left-right shaft structure.
  • the sensor may be a variety of torque sensors or speed sensors. It should be noted that many variations and modifications may be made by those skilled in the art without departing from the inventive concept. The scope of protection of the invention. Therefore, the scope of the invention should be determined by the appended claims.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

一种压力测量装置，包括轴承（1）、轴承套（2）和力传感器（3），轴承（1）设置在轴承套（2）内，力传感器（3）设置在轴承（1）的外圈（7）外侧或设置在轴承套（2）上。压力测量装置使用间接测量的方式测量拉力，保持较高的灵敏度。

Description

一种压力测量装置 技术领域
本发明属于传感器领域，尤其涉及一种压力测量装置。
背景技术
压力传感器是最常用的传感器之一，按照原理可分为应变片式和弹簧式等，但现有的压力传感器，通常要求被测物体与传感器相对固定，在被测物体移动的情况下，传统的传感器无法良好实现测量，比如应变片的触点需要导线连接，在轴旋转时，通常无法使用或利用滑环进行连接，但此时，传感器寿命将受到滑环等构建的影响，可靠性不佳，缺乏一种适用于运转或移动情况下的压力测量装置。
发明内容
有鉴于此，为了克服现有技术的不足本发明提供一种压力测量装置，通过将传感器外置，并利用转动或移动的组件受压对固定组件造成的压力进行测量，以间接测量的方式，解决现有直接测量方式中，传感器无法布置或寿命受限的问题。
为了实现上述技术目的，本发明采用以下技术方案：
一种压力测量装置，包括轴承、轴承套和力传感器，轴承设置在轴承套内，力传感器设置在轴承的外圈外侧或设置在轴承套上。
进一步的，轴承套设置有轴承安装位和力传感器安装位，轴承安装位和力传感器安装位分别设置在隔板两侧或轴承安装位和力传感器安装位直接相连。
进一步的，当力传感器设置在轴承上时，所述轴承的外圈外侧贴合设置有力传感器，所述外圈还设置有键槽，并且在所述轴承套的相应位置设置有与所述外圈的键槽所匹配的键槽。
进一步的，轴承还设置有支撑架和防尘盖。
进一步的，所述轴承安装位为圆孔，所述键槽与力传感器安装位相对布置，所述力传感器安装位为槽状，该槽状力传感器安装位与轴承安装位的圆孔连接处相切或设置有圆弧倒角。
进一步的，轴承安装位的圆孔对轴承的包覆角度不小于181°。
进一步的，当力传感器设置在轴承套上时，轴承安装位为圆孔，轴承安装位外侧设置有力传感器安装位，力传感器安装位与轴承安装位依靠隔板连接，传感器安装位为槽或孔，传感器安装位与轴承安装位相邻一侧设置成圆弧状，且与轴承安装位同轴布置，力传感器设置在隔板上。
进一步的，隔板与轴承套一体化制造或作为插接板插在轴承套内，力传感器安装位宽度与轴承安装位的直径相同。
进一步的，力传感器为应变片。
进一步的，还包括线路板，所述线路板外置或设置在力传感器安装位内，线路板与力传感器连接。
进一步的，所述轴承为深沟球轴承、滚子轴承、推力轴承或调心轴承中的一种。
进一步的，轴承游隙不大于0.5mm。
一种中轴力矩传感器，使用本发明的压力测量装置。
本发明的有益效果为：
1)通过将力传感器贴在轴承外圈或将力传感器设置在轴承套上，使用间接测量的方式测量拉力，结构简单，成本低廉。
2)通过将压力测量装置设置在固定组件上，不影响设备的正常运转，同时能保证较为准确的计量值。
3)通过设置传感器安装位，避免力传感器安装干涉并通过设置键来固定轴承，实现轴承的良好固定。
4)通过合理的设置轴承包覆角度和隔板厚度，既保证了轴承安装的可靠性和稳定性，又能良好控制固定组件形变，控制力的测量范围，并保持较高的灵敏度。
附图说明
图1为本发明一种压力测量装置的第一实施例结构示意图；
图2为本发明一种压力测量装置具有整体轴承套的结构示意图；
图3为本发明一种压力测量装置第二实施例的结构示意图；
图4为本发明一种压力测量装置的轴承结构示意图；
图5为本发明一种压力测量装置应用于自行车中轴时的结构示意图；
图6为本发明一种压力测量装置的一轴承结构构示意图；
附图中各标注名称如下：1、轴承；2、轴承套；3、力传感器；4、线路板；5、传感器安装位；6、内圈；7、外圈；8、滚动体；9、键槽；9-1轴承套键槽；10、螺纹连接部；11、唇口；12、轴承安装位。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，下面结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。
一种压力测量装置，包括轴承1、轴承套2和力传感器3，轴承1设置在轴承套2内，力传感器3设置在轴承1的外圈7外侧或设置在轴承套2上，轴承套2设置有轴承安装位和力传感器3安装位，轴承安装位和力传感器3安装位分别设置在隔板两侧或轴承安装位和力传感器3安装位直接相连。
第一实施例
请参阅图1和图2：
一种压力测量装置，包括轴承1、轴承套2和力传感器3，轴承1设置在轴承套2内，力传感器3设置在轴承套2上，轴承套2设置有轴承安装位12和力传感器3安装位，轴承安装位12和力传感器3安装位分别设置在隔板两侧，具体为:
请参阅图1，轴承套2可以为任意形状，轴承套2设计有一个椭圆形孔或其他不规则的弧形孔，通过隔板形成一个圆形的轴承安装位12和一个传感器安装位5，轴承安装位12和传感器安装位5依靠隔板分隔，该隔板为弧形，隔板外径大于轴承1的外径，且该隔板可插入轴承套2，并与该轴承套2的对应部分紧密配合，隔板与轴承套2共同组成圆形的轴承安装位12，图中，该隔板为等厚度的匀质弧形板，当然为获得不同的测量性能，可根据需要改变该隔板各处的厚度，本实施中，轴承安装位12内设置有轴承1。该轴承1为普通轴承1，比如深沟球轴承1，滚子轴承1、推力轴承1、调心轴承1等，在此不加以限制。
轴承套2与隔板还形成有另一个传感器安装位5，用于设置力传感器3和放置线路板4，其中力传感器3设置在隔板外侧并紧贴在隔板表面设置，力传感器3可选用应变片或弹簧式压力传感器3，本实施例中，力传感器3为应变片。需要注意的是，为了获得更好的性能，力传感器3安装位的宽度与轴承1的外径相同，力传感器3的边缘设置圆弧倒角，以减少应力集中现象，导致压力测量装置失效。传感器安装位5中可设置线路板4，该线路板4为放大器或其他信号处理单元，当然，线路板4也可外置，并通过导线与设置在隔板上的应变片连接。
此外为保证隔板的安装和正常工作，隔板两端应留出适当长度并与轴承套2良好固定。
请参阅图2，相比如图1所示的实施例，图2中，将隔板与轴承套2一体化设计，可通过铸造切削等方式直接制造，简化制造工艺，降低成本。
第二实施例，
请参阅图3和图4，
一种压力测量装置，包括包括轴承1、轴承套2和力传感器3，轴承1设置在轴承套2内，力传感器3设置在轴承1外侧，轴承套2设置有轴承安装位12和力传感器3安装位，轴承安装位12和力传感器3安装位不通过隔板直接相连，具体为:
请参阅图3，轴承套2可以为任意形状，轴承套2设计有一个椭圆形孔或其他不规则的弧形孔，该弧形或椭圆形孔为由圆形的轴承安装位12和一个传感器安装位5复合并直接连接形成。其中，轴承安装位12为大半个圆，轴承安装位12可以对轴承1形成半包覆结构，在轴承安装位12上设置有轴承套键槽9-1，该轴承套键槽9-1可设置在轴承安装位12的任意位置，最佳的，该键槽9与轴承安装位12的开口相对布置，轴承安装位12与轴承1的接触的两个端点到轴承1旋转中心构成的角度a为包覆角度，为保证轴承1的良好固定，轴承包覆角度a应大于180°，比如在本实施例中，该角度为220°，当然，根据不同的传感器设计需求，可设置不同的轴承包覆角度a，仅仅需要保证轴承1能良好固定且不会从安装位内脱出即可，传感器安装位5与轴承安装位12直接联通，如图3所示，传感器安装位5的两边与轴承安装位5的两侧端点相切，当然，根据不同的设计要求，可不与轴承安装位12的两个端点相切，但应该设置圆弧倒角以避免相交处产生应力集中。
除上述的轴承安装位12的两个端点与传感器安装位5的两边直接相连外，还可设置将轴承安装位12的两端设计成唇口11状，唇口11的前段设置成圆弧状，向传感器安装位5一侧延伸。本实施中，轴承安装位12内设置有轴承1。比如深沟球轴承1，滚子轴承1、推力轴承1、调心轴承1等，在此不加以限制。
请参阅图4，需要注意的是，本实施例中的轴承1为力矩轴承1，该力矩轴承1包括内圈6、外圈7和滚动体8，轴承1的内圈6和外圈7同轴连接，轴承1的内圈6和外圈7之间环形等距排布有滚动体8，轴承1的外圈7外侧贴合设置有力传感器3，外圈7还设置有键槽9，最佳的，键槽9与力传感器3相对布置，当然，键槽9也可与力传感器3成角度布置，为获得更好的寿命和性能，轴承1还可增加支撑架和防尘盖，此外轴 承1安装设置有一定的游隙，保证轴承1外圈7具有合理的形变量，该游隙不大于0.5mm。
该力矩轴承1通过调整外圈7的厚度以实现不同的刚度，从而调整力传感器3的灵敏度与量程。此外也可通过调整唇口11的厚度与延伸长度来获得特定的测量能力。本实施例中，力传感器3为应变片，该应变片,设置在轴承1外圈7并与轴承1外圈7紧密贴合。应变片的输出连接有线路板4，该线路板4为放大器或其他信号处理单元，线路板4设置在传感器安装位5内，当然，线路板4也可外置并通过导线与力传感器3连接。
特别的，力传感器3应设置在轴承安装位12和一个传感器安装位5相交处，且力传感器3应处于相交处的中心位置。力传感器3不应被轴承安装位12的任意一处覆盖，因此，唇口11的延伸长度不应该遮盖应变片。
第三实施例，
请参阅图5，本图为该压力测量装置在自行车中轴力矩传感器上的应用，轴承套2与力矩中轴的端盖一体化制造，在端盖上设置轴承安装位12与传感器安装位5，轴承安装位12为圆弧状态，轴承安装位12末端连接有传感器安装位5，轴承安装位12与传感器安装位5直接相连，传感器安装位5两侧与轴承安装位12末端相切，轴承安装位12的两端与轴承1旋转轴心的连线构成的包覆角度为220°，轴承安装位12内还设置有键槽9，轴承安装位12内设置有轴承1，该轴承1设置有键槽9，轴承1的键槽9与轴承安装位12的轴承套键槽9-1对齐并依靠键定位连接，保证轴承1外圈7的旋转固定，轴承1外圈7贴合有压力应变片，用以测量轴承1形变，压力应变片的输出连接到线路板4上，线路板4设置在传感器安装位5内。
端盖一端设置有螺纹连接部10，该螺纹连接部10与自行车五通连接。端盖的轴承1内设置有轴，该轴上设置有牙盘和曲柄。
需要特别注意的是，该压力测量装置应横向布置，即，压力测量装置中心与轴承1中心的连线与地面水平。
当然，除了使用实施例2的方案，该自行车中轴力矩传感器也可采用实施例1的方案进行压力测量。
用作力矩测量时，该压力测量装置的工作原理为：工作时，当人踩踏踏板，通过曲柄带动轴和牙盘旋转，牙盘通过链条带动车轮旋转。由于车轮的运行阻力，使得链条绷紧，链条对牙盘产生向后的拉力，该拉力通过轴施加在轴承1上，由于轴承1的力传感器3横向布置，当轴承1受到向后的压力时，压力作用于轴承1贴合传感器一侧的外圈7，使得轴承1的外圈7承受拉力，造成形变，通过应变片的阻值改变进行压力测量，此时通过换算可得出输入扭矩或可直接使用该拉力值作为车辆的控制信号，在车辆静止或滑行时，由于链条不受力，不产生向后的拉力，此时，即便人站立在自行车上，由于人对轴承1的压力向下，不产生向后的拉力，此时的轴承1侧向形变量小，输出信号小或无信号，以此作为判别车辆助力的依据。
当然该压力测量装置还可以作为骑行的功率计或体能消耗的传感器数据来源。并适用于前驱或后驱轮毂电机的方案。
第四实施例
本实施例为压力测量装置作为一种称重传感器的应用，具体为，以实施例1或实施例2的传感器为例。轴承套2内设置有轴承1，轴承1内圈6套接有轴，轴承套2可与基座或壳体固定，在安装轴承套2时，将轴承套2或轴承1上设置力传感器的一面向下垂直地面安装。力传感器的输出连接放大器或处理电路并输出。
工作时，当轴受到一个向下的压力，轴将压力传递给轴承1，轴承1的外圈7或隔板受到压力产生形变，应变片采集该形变并转化为压力信号输出，相比于常规的静态测量方式，该传感的测量优势在于，既可以像传统的传感器一样进行静态压力测量，还可以在运动过程中进行测量，比如将该传感器设置在传送带上，滚轮带动轴传动，同时传送带上的压力通过滚轮和轴对轴承1施压产生形变进行测量，此时并不影响轴的运转工作，实现传送带工作过程的实时测量。由此扩展，该压力测量装置还可用于车 辆轮轴等处的压力测量，用于测量车辆的装在量和行驶中的冲击力等。
本发明一种压力测量装置的有益效果为：
1)通过将力传感器贴在轴承外圈或将力传感器设置在轴承套上，使用间接测量的方式测量拉力，结构简单，成本低廉。
2)通过将压力测量装置设置在固定组件上，不影响设备的正常运转，同时能保证较为准确的计量值。
3)通过设置力传感器安装位，避免力传感器安装干涉并通过设置键来固定轴承，实现轴承的良好固定。
4)通过合理的设置轴承包覆角度和隔板厚度，既保证了轴承安装的可靠性和稳定性，又能良好控制固定组件形变，控制力的测量范围，并保持较高的灵敏度。
以上所述实施例仅表达了本发明的实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。可以采用不同的组合方式来实施本发明，如电机可以采用同心同轴安装或者一侧安装，减速机构可以通过行星轮减速或者其他齿轮、链条减速结构，中轴可以采用单轴结构或者左右轴结构，传感器可以采用各种扭矩传感器或者速度传感器，应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (13)

  1. 一种压力测量装置，其特征在于，包括轴承、轴承套和力传感器，所述轴承设置在轴承套内，所述力传感器设置在所述轴承的外圈外侧或设置在所述轴承套上。
  2. 根据权利要求1所述的压力测量装置，其特征在于，所述轴承套设置有轴承安装位和力传感器安装位，所述轴承安装位和力传感器安装位分别设置在隔板两侧或轴承安装位和力传感器安装位直接相连。
  3. 根据权利要求2所述的压力测量装置，其特征在于，当力传感器设置在轴承上时，所述轴承的外圈外侧贴合设置有力传感器，所述外圈还设置有键槽，并且在所述轴承套的相应位置设置有与所述外圈的键槽所匹配的键槽。
  4. 根据权利要求3所述的压力测量装置，其特征在于，所述轴承还设置有支撑架和防尘盖。
  5. 根据权利要求3所述的压力测量装置，其特征在于，所述轴承安装位为圆孔，所述键槽与力传感器安装位相对布置，所述力传感器安装位为槽状，该槽状力传感器安装位与轴承安装位的圆孔连接处相切或设置有圆弧倒角。
  6. 根据权利要求5所述的压力测量装置，其特征在于，所述轴承安装位的圆孔对轴承的包覆角度不小于181°。
  7. 根据权利要求2所述的压力测量装置，其特征在于，当力传感器设置在轴承套上时，所述轴承安装位为圆孔，轴承安装位外侧设置有力传感器安装位，所述力传感器安装位与轴承安装位依靠隔板连接，所述传感器安装位为槽或孔，所述传感器安装位与轴承安装位相邻一侧设置成圆弧状，且与轴承安装位同轴布置，所述力传感器设置在隔板上。
  8. 根据权利要求7所述的压力测量装置，其特征在于，所述隔板与轴承套一体化制造或作为插接板插在轴承套内，所述力传感器安装位宽度与轴承安装位的直径相同。
  9. 根据权利要求1-8任意一条所述的压力测量装置，其特征在于，所述力传感器为应变片。
  10. 根据权利要求1-8所述的压力测量装置，其特征在于，还包括线路板，所述线路板外置或设置在力传感器安装位内，所述线路板与力传感器连接。
  11. 根据权利要求1-8任一所述的压力测量装置，其特征在于，所述轴承为深沟球轴承、滚子轴承、推力轴承或调心轴承中的一种。
  12. 根据权利要求1-8任一所述的压力测量装置，其特征在于，所述轴承游隙不大于0.5mm。
  13. 一种中轴力矩传感器，其特征在于，使用权1所述的压力测量装置。
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