A dynamometer and a torque calibration device thereof
Patent Information
- Application Number
- CN202522473550.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-20
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-20
AI Technical Summary
但是，砝码标定技术需要装卸大量的砝码才能满足大量程的标定，标定效率极低、标定疲劳强度大，影响标定人员的工作情绪，最终影响标定的精度
[0019]本实用新型中，所提出的测功器及其扭矩标定装置，在力传递过程中采用了推拉滚珠花键轴和滚珠花键套，减少了静摩擦系数，使得该扭矩标定装置在力传递过程中的摩擦阻尼减小，有效提高了标定的精准度。
Smart Images
Figure CN224906196U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of aviation power testing technology, and in particular to a dynamometer and its torque calibration device. Background Technology
[0002] With the development of digital technology for torque measurement in dynamometers used for aviation power testing, dynamometers generally employ force sensors to measure force or torque. However, the mechanical structure connecting the sensor has some degree of damping, so a dedicated calibration mechanism is needed to calibrate the damping to ensure the accuracy of the dynamometer's force or torque measurement.
[0003] In the field of aero-engine testing, dynamometers typically employ calibration techniques such as weight calibration and hydraulic calibration. However, weight calibration requires loading and unloading a large number of weights to achieve a large calibration range, resulting in extremely low calibration efficiency, high calibration fatigue, and negatively impacting the morale of calibration personnel, ultimately affecting calibration accuracy. Hydraulic calibration, on the other hand, suffers from unavoidable leakage in the calibration cylinder, affecting the operator's reading accuracy and ultimately impacting overall calibration accuracy. Therefore, it cannot meet the relatively high accuracy requirements of aero-engine dynamometers with large structures, relatively small torque ranges.
[0004] Therefore, there is a lack of torque calibration devices that are both highly accurate and easy to operate. Utility Model Content
[0005] To address the technical problems existing in the background art, this utility model proposes a dynamometer and its torque calibration device.
[0006] This utility model proposes a torque calibration device for a dynamometer, comprising: a calibration arm, a push-pull ball spline shaft, two pressure nuts, and a sensor;
[0007] The calibration arm is fixedly connected to the outer wall of the housing assembly of the dynamometer body. The calibration arm has a positioning hole that runs vertically through it. A ball spline sleeve is fixed in the positioning hole. The push-pull ball spline shaft is axially slidably connected to the ball spline sleeve, and both ends of the push-pull ball spline shaft extend out of the positioning hole and are respectively threaded and fixed to two pressure nuts. Elastic components are fitted on the push-pull ball spline shaft located between the pressure nuts and the calibration arm.
[0008] The top of the sensor is hinged to the bottom of the push-pull ball spline shaft, and the bottom of the sensor is hinged to the supporting fixed platform.
[0009] Preferably, it further includes a thrust ball joint bearing housing, a thrust ball joint bearing, a ball joint bearing, and a shaft housing;
[0010] The thrust ball joint bearing housing and the bottom end of the push-pull ball spline shaft are fixedly connected; the ball end of the thrust ball joint bearing is rotatably installed in the thrust ball joint bearing housing, and the rod end of the thrust ball joint bearing is fixedly connected to the top of the sensor; one end of the joint bearing is fixedly connected to the bottom of the sensor, and the other end of the joint bearing is hinged to the shaft seat, which is used to fix it on the support platform.
[0011] Preferably, the push-pull ball spline shaft includes a rotating part and sliding parts located at both ends of the rotating part. The diameter of the sliding part is smaller than the diameter of the rotating part, and the axial length of the rotating part is smaller than the axial length of the positioning hole.
[0012] The rotating part is provided with a ball spline groove, and the rotating part is axially slidably connected in the ball spline sleeve to form a ball spline pair with the ball spline sleeve; the outer periphery of the sliding part away from the rotating part is provided with threads for the threaded fixing of the pressure nut.
[0013] The calibration arm is equipped with two limiting washers to prevent the rotating parts from disengaging from the two ends of the positioning hole; the elastic component is sleeved on the push-pull ball spline shaft between the pressure nut and the limiting washers.
[0014] Preferably, each elastic component includes a thrust bearing, a thrust bearing housing, and a diaphragm spring assembly; the thrust bearing, thrust bearing housing, and diaphragm spring assembly are sequentially sleeved on the sliding part along the direction from the pressure nut to the limiting washer, and the inner and outer rings of the thrust bearing are respectively fixedly connected to the adjacent pressure nut and thrust bearing housing.
[0015] Preferably, the two ends of the diaphragm spring assembly are fixedly connected to the thrust bearing seat and the limiting washer, respectively.
[0016] Preferably, the calibration arm is equipped with an oil nozzle for refueling.
[0017] Secondly, this utility model also proposes a dynamometer, including a supporting and fixed platform, a dynamometer body, a force measuring device, and a torque calibration device for the dynamometer as described in any one of the first aspects; the dynamometer body is mounted on the supporting and fixed platform, the torque calibration device is connected between one side of the housing assembly of the dynamometer body and the supporting and fixed platform, and the force measuring device is connected between the other side of the housing assembly and the supporting and fixed platform.
[0018] In practice, when calibrating in one direction, the pressure nut located above or below is loosened so that the pressure nut located above or below is not under force; at the same time, the pressure nut located below or above is tightened. During its rotation, the pressure nut generates axial tension, which pulls the push-pull ball spline shaft to move axially and applies force to the calibration arm through the elastic component. The calibration arm transmits the force to the force measuring device of the dynamometer through the dynamometer body.
[0019] In this invention, the proposed dynamometer and its torque calibration device employ a push-pull ball spline shaft and ball spline sleeve during force transmission, which reduces the static friction coefficient and decreases the frictional damping of the torque calibration device during force transmission, effectively improving the calibration accuracy. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of a torque calibration device for a dynamometer proposed in this utility model.
[0021] Figure 2 This is a schematic diagram of the structure of a dynamometer proposed in this utility model. Detailed Implementation
[0022] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0023] Firstly, such as Figure 1 As shown, the present invention proposes a torque calibration device 100 for a dynamometer, comprising: a calibration arm 108, a push-pull ball spline shaft 101, two pressure nuts 102, and a sensor 111;
[0024] The calibration arm 108 is fixedly connected to the outer wall of the housing assembly of the dynamometer body 200. The calibration arm 108 has a positioning hole that runs vertically through it. A ball spline sleeve 107 is fixed in the positioning hole. The push-pull ball spline shaft 101 is axially slidably connected in the ball spline sleeve 107 to form a ball spline pair with the ball spline sleeve 107. Both ends of the push-pull ball spline shaft 101 extend out of the positioning hole and are threadedly fixed to two pressure nuts 102 respectively. Elastic components are fitted on the push-pull ball spline shaft 101 located between the pressure nuts 102 and the calibration arm 108.
[0025] The top end of sensor 111 is rotatably connected to the bottom end of push-pull ball spline shaft 101, and the bottom end of sensor 111 is used to hinge with support and fixed platform 400.
[0026] In practice, when calibrating in one direction, the pressure nut 102 located above or below is loosened so that the pressure nut 102 located above or below is not under force; at the same time, the pressure nut 102 located below or above is tightened. The pressure nut 102 generates axial tension during its rotation, which pulls the push-pull ball spline shaft 101 to move axially and applies force to the calibration arm 108 through the elastic component. The calibration arm 108 transmits the force to the force measuring device of the dynamometer through the dynamometer body 200.
[0027] This invention employs a push-pull ball spline shaft 101 and a ball spline sleeve 107 during force transmission, which reduces the static friction coefficient and decreases the frictional damping of the torque calibration device 100 during force transmission, effectively improving the calibration accuracy.
[0028] In this embodiment, it also includes a thrust ball joint bearing housing 109, a thrust ball joint bearing 110, a ball joint bearing 112, and a bearing housing 113;
[0029] The bottom end of the thrust ball joint bearing housing 109 and the push-pull ball spline shaft 101 are fixedly connected; the ball end of the thrust ball joint bearing 110 is rotatably installed in the thrust ball joint bearing housing 109, and the rod end of the thrust ball joint bearing 110 is fixedly connected to the top of the sensor 111; one end of the joint bearing 112 is fixedly connected to the bottom of the sensor 111, and the other end of the joint bearing 112 is hinged to the bearing seat 113, which is used to fix it on the support platform 400.
[0030] This embodiment, through the arrangement of the thrust ball joint bearing seat 109, thrust ball joint bearing 110, ball joint bearing 112, and shaft seat 113, can reduce the static friction coefficient, thereby enabling accurate calibration. Furthermore, when the housing assembly of the dynamometer body 200 is subjected to tension and compression, the sensor 111 will undergo a certain axial deformation, causing the housing assembly of the dynamometer body 200 to swing around its rotation center at a certain angle. The universal joints at both ends of the sensor 111 provide angle compensation capabilities, resulting in minimal additional lateral force on the axial movement of the push-pull ball spline shaft 101 and low axial sliding damping, significantly improving force transmission efficiency and calibration accuracy.
[0031] Specifically, the other end of the spherical bearing 112 is connected to the bearing seat 113 via a pin.
[0032] In this embodiment, the push-pull ball spline shaft 101 includes a rotating part and sliding parts located at both ends of the rotating part. The diameter of the sliding part is smaller than the diameter of the rotating part, and the axial length of the rotating part is smaller than the axial length of the positioning hole.
[0033] The rotating part is provided with a ball spline groove, and the rotating part is axially slidably connected inside the ball spline sleeve 107 to form a ball spline pair with the ball spline sleeve 107; the outer periphery of the sliding part away from the rotating part is provided with threads for threaded fixing with the pressure nut 102.
[0034] The calibration arm 108 is provided with two limiting washers 106 for preventing the rotating parts from disengaging from the two ends of the positioning hole; the elastic component is sleeved on the push-pull ball spline shaft 101 between the pressure nut 102 and the limiting washers 106.
[0035] With this configuration, this embodiment limits the distance between the pressure nut 12, the elastic component, and the limiting washer 106, so that the axial deformation of the elastic component is proportional to the calibrated force. The maximum calibrated force can be adjusted by adjusting the stiffness and number of elastic components.
[0036] In this embodiment, each elastic component includes a thrust bearing 103, a thrust bearing housing 104, and a diaphragm spring assembly 105. The thrust bearing 103, the thrust bearing housing 104, and the diaphragm spring assembly 105 are sequentially sleeved on the sliding part along the direction from the pressure nut 102 to the limiting washer 106, and the inner and outer rings of the thrust bearing 103 are fixedly connected to the adjacent pressure nut 102 and the thrust bearing housing 104, respectively.
[0037] In this embodiment, the static friction coefficient can be further reduced by using the thrust bearing 103 and the thrust bearing housing 104.
[0038] In a further embodiment, the two ends of the diaphragm spring assembly 105 are fixedly connected to the thrust bearing seat 104 and the limiting washer 106, respectively, so as to further avoid friction between the spring of the diaphragm spring assembly 105 and the push-pull ball spline shaft 101.
[0039] In this embodiment, the calibration arm 108 is also provided with an oil nozzle for periodically lubricating the ball spline pair to ensure smooth axial movement of the push-pull ball spline shaft 101.
[0040] In one specific embodiment, the bottom end of the push-pull ball spline shaft 1012 is fixedly connected to the thrust ball bearing seat 10917 by a cap.
[0041] Secondly, such as Figure 2 As shown, this utility model also proposes a dynamometer, including a supporting and fixed platform 400, a dynamometer body 200, a force measuring device, and a torque calibration device 100 for the dynamometer as described in any one of the first aspects; the dynamometer body 200 is mounted on the supporting and fixed platform 400, the torque calibration device is connected between one side of the housing assembly of the dynamometer body 200 and the supporting and fixed platform 400, and the force measuring device is connected between the other side of the housing assembly and the supporting and fixed platform 400.
[0042] Because the dynamometer has damping in its external piping connections, swing bearings, and calibration sensor 111 connection structure, it is necessary to check the torque measurement damping of the dynamometer through online calibration to ensure that the torque measurement is within the specified accuracy range. This utility model reduces the connection damping of force transmission through a designed torque calibration device, thereby improving the calibration accuracy, and can achieve both forward and reverse calibration.
[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A torque calibration device for a dynamometer, characterized in that, include: Calibration arm, push-pull ball spline shaft, two pressure nuts and sensor; The calibration arm is fixedly connected to the outer wall of the housing assembly of the dynamometer body. The calibration arm has a positioning hole that runs vertically through it. A ball spline sleeve is fixed inside the positioning hole. The push-pull ball spline shaft is axially slidably connected inside the ball spline sleeve, and both ends of the push-pull ball spline shaft extend out of the positioning hole and are respectively threaded and fixed to two pressure nuts. Elastic components are fitted on the push-pull ball spline shaft located between the pressure nuts and the calibration arm. The top of the sensor is hinged to the bottom of the push-pull ball spline shaft, and the bottom of the sensor is hinged to the supporting fixed platform.
2. The torque calibration device for the dynamometer according to claim 1, characterized in that, It also includes thrust ball joint bearing housings, thrust ball joint bearings, ball joint bearings, and bearing housings; The thrust ball joint bearing housing and the bottom end of the push-pull ball spline shaft are fixedly connected; the ball end of the thrust ball joint bearing is rotatably installed in the thrust ball joint bearing housing, and the rod end of the thrust ball joint bearing is fixedly connected to the top of the sensor; one end of the joint bearing is fixedly connected to the bottom of the sensor, and the other end of the joint bearing is hinged to the shaft seat, which is used to fix it on the support platform.
3. The torque calibration device for the dynamometer according to claim 1, characterized in that, The push-pull ball spline shaft includes a rotating part and sliding parts located at both ends of the rotating part. The diameter of the sliding part is smaller than the diameter of the rotating part, and the axial length of the rotating part is smaller than the axial length of the positioning hole. The rotating part is provided with a ball spline groove, and the rotating part is axially slidably connected in the ball spline sleeve to form a ball spline pair with the ball spline sleeve; the outer periphery of the sliding part away from the rotating part is provided with threads for the threaded fixing of the pressure nut. The calibration arm is equipped with two limiting washers to prevent the rotating parts from disengaging from the two ends of the positioning hole; the elastic component is sleeved on the push-pull ball spline shaft between the pressure nut and the limiting washers.
4. The torque calibration device for the dynamometer according to claim 3, characterized in that, Each elastic component includes a thrust bearing, a thrust bearing housing, and a diaphragm spring assembly; The thrust bearing, thrust bearing housing, and diaphragm spring assembly are sequentially sleeved on the sliding part along the direction from the pressure nut to the limiting washer, and the inner and outer rings of the thrust bearing are fixedly connected to the adjacent pressure nut and thrust bearing housing, respectively.
5. The torque calibration device for the dynamometer according to claim 4, characterized in that, The two ends of the diaphragm spring assembly are fixedly connected to the thrust bearing seat and the limiting washer, respectively.
6. The torque calibration device for the dynamometer according to claim 1, characterized in that, The calibration arm is equipped with a nozzle for refueling.
7. A dynamometer, characterized in that, It includes a support and fixing platform, a dynamometer body, a force measuring device, and a torque calibration device for the dynamometer as described in any one of claims 1-6; the dynamometer body is mounted on the support and fixing platform, the torque calibration device is connected between one side of the housing assembly of the dynamometer body and the support and fixing platform, and the force measuring device is connected between the other side of the housing assembly and the support and fixing platform.