CN220437649U - Online calibration device for torque of dynamometer - Google Patents
Online calibration device for torque of dynamometer Download PDFInfo
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- CN220437649U CN220437649U CN202320978405.7U CN202320978405U CN220437649U CN 220437649 U CN220437649 U CN 220437649U CN 202320978405 U CN202320978405 U CN 202320978405U CN 220437649 U CN220437649 U CN 220437649U
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Abstract
The utility model relates to an online calibration device for torque of a dynamometer, which comprises: the base and the calibration support are provided; the rotary transmission assembly comprises a transmission rotating shaft which is rotatably arranged on the calibration support and is coaxially arranged with the rotating shaft of the dynamometer, a coupler which is used for coaxially and fixedly connecting the transmission rotating shaft and the rotating shaft of the dynamometer, and a mounting sleeve which is coaxially and fixedly sleeved on the outer peripheral side of the transmission rotating shaft; the calibration arm is fixedly connected with the outer peripheral side of the mounting sleeve; and the loading assembly is used for loading linear displacement control to the calibration arm so that the calibration arm drives the transmission rotating shaft to rotate through the mounting sleeve, and further, torque is transmitted to the rotating shaft of the dynamometer through the coupler. The calibration device does not need to be provided with a special calibration motor and a torque rotating speed sensor, and the axial size of the calibration device is not increased, so that the structural complexity and cost of the calibration device can be reduced, and the installation convenience of the calibration device is improved.
Description
Technical Field
The utility model relates to the field of online calibration of torque of a dynamometer, in particular to an online calibration device of torque of a dynamometer.
Background
At present, in the development process of electric automobiles, the influence of the test technology of an electric drive system and the test conditions thereof on the development of the whole automobile is increasingly large. The efficiency bench test is the most main means for obtaining the efficiency of the electric drive system, and the accurate measurement and control of the torque of the dynamometer system of the efficiency test bench are key for accurately obtaining the efficiency of the electric drive system.
The torque of the dynamometer system is usually measured through a torque sensor arranged on a bench, and before measurement, the torque sensor is calibrated on line to eliminate the influence of installation and use environment and the like, so that an important means for ensuring accurate measurement of efficiency is provided. When the torque sensor of the dynamometer performs online calibration, the torque needs to be loaded on the dynamometer, and a special calibration motor is generally arranged to load rotation control (namely, torque) on the dynamometer in the prior art.
However, setting a new calibration motor needs to configure a corresponding torque rotation speed sensor, which not only greatly increases the structural complexity and cost of torque calibration of the dynamometer, but also has the problem that the precision of the torque rotation speed sensor of the new calibration motor is difficult to ensure, namely, the problem of the precision of the new sensor is introduced, so that the precision of torque calibration of the dynamometer is difficult to ensure. Meanwhile, in the prior art, the axial size of the calibration device can be greatly increased through a new mode of directly loading and rotating the calibration motor, so that the installation convenience of the calibration device is poor, and further the practicability of torque calibration of the dynamometer is poor. Therefore, how to design a calibration device structure that can reduce the structural complexity and cost of the calibration device and improve the installation convenience of the calibration device is a technical problem that needs to be solved.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to solve the technical problems that: how to provide a dynamometer torque on-line calibration device, need not to set up special demarcation motor and torque rotation speed sensor to can not increase the axial dimensions of demarcation device, thereby can reduce the structural complexity and the cost of demarcation device and improve demarcation device's installation convenience, and then can assist the accuracy and the practicality that improve the online demarcation of dynamometer torque.
In order to solve the technical problems, the utility model adopts the following technical scheme:
an online calibration device for torque of a dynamometer, comprising:
the base is used for installing a dynamometer to be calibrated;
the calibration support is arranged on one side of the base corresponding to the rotating shaft of the dynamometer;
the rotary transmission assembly comprises a transmission rotating shaft which is rotatably arranged on the calibration support and is coaxially arranged with the rotating shaft of the dynamometer, a coupler which is used for coaxially and fixedly connecting the transmission rotating shaft and the rotating shaft of the dynamometer, and a mounting sleeve which is coaxially and fixedly sleeved on the outer peripheral side of the transmission rotating shaft;
the calibration arm is fixedly connected with the outer peripheral side of the mounting sleeve;
the loading assembly is arranged on the calibration support and is in transmission connection with the calibration arm, and is used for loading linear displacement control to the calibration arm so that the calibration arm drives the transmission rotating shaft to rotate through the mounting sleeve, and further torque is transmitted to the rotating shaft of the dynamometer through the coupler.
Preferably, the rotary transmission assembly further comprises a bearing seat fixedly arranged on the calibration support, and a bearing with an outer ring fixedly arranged on the bearing seat;
the transmission rotating shaft is fixedly connected with the inner ring of the bearing in a coaxial mode.
Preferably, a mounting hole which is adapted to the outer peripheral side of the mounting sleeve is formed in the middle position of the calibration arm; the calibration arm is coaxially and fixedly arranged on the outer peripheral side of the mounting sleeve through the mounting hole, and the axis of the transmission rotating shaft is used as a rotating center.
Preferably, the calibration arm comprises two arm parts which are symmetrical based on the vertical plane of the axis of the transmission rotating shaft; each arm part of the calibration arm is projected along the axis direction of the transmission rotating shaft to form isosceles trapezoid wedges which gradually narrow towards the direction away from the installation sleeve, and the symmetry line of the isosceles trapezoid wedges obtained by the projection of the calibration arm is vertical to the axis of the transmission rotating shaft.
Preferably, the calibration arm is provided with a plurality of through holes at intervals along the direction perpendicular to the axis of the mounting hole.
Preferably, the loading assembly comprises an actuator fixedly arranged on the calibration support and used for outputting linear displacement control, and a connecting clamp used for connecting a displacement output end of the actuator and the calibration arm.
Preferably, the contact between the connecting clamp and the calibration arm is rolling contact of a needle roller.
Preferably, the method further comprises:
the sliding rail is fixedly arranged on one side of the base corresponding to the rotating shaft of the dynamometer, and the sliding direction is opposite to the dynamometer;
and the movable slide block is arranged on the slide rail in a sliding manner and is used for fixedly mounting the calibration support.
Compared with the prior art, the online torque calibration device of the dynamometer has the following beneficial effects:
according to the linear displacement control device, linear displacement control is applied to the calibration arm through the loading assembly, the calibration arm drives the transmission rotating shaft to rotate at a constant speed through the mounting sleeve and transmits torque to the rotating shaft of the dynamometer through the coupler, and the linear motion loaded by the loading assembly can be converted into constant-speed rotation (namely rotation control) of the rotation transmission assembly. On the one hand, the linear displacement control is converted into rotation control, and then the actual torque signal transmitted to the dynamometer can be calculated through the force value and the displacement value during loading linear displacement control so as to realize online torque calibration of the dynamometer, namely, a special calibration motor and a torque rotating speed sensor are not required to be arranged, the problem of precision of a new torque sensor is avoided, the structural complexity and the cost of a calibration device can be reduced, and further, the online torque calibration accuracy of the dynamometer can be improved in an auxiliary mode. On the other hand, the mode of converting the loading linear displacement control into the rotation control does not increase the axial dimension of the calibration device, is favorable for simplifying the structure of the calibration device, and can improve the installation convenience of the calibration device, and further can assist in improving the practicability of online calibration of the torque of the dynamometer.
The rotary transmission assembly does not generate structural interference with the dynamometer when the linear motion loaded by the loading assembly is converted into uniform rotation motion, and rotation control loaded by the dynamometer after conversion enables the torque calibration process of the dynamometer to be closer to reality, so that the consistency, efficiency and automation degree of online torque calibration of the dynamometer can be improved.
The calibration device can realize the online calibration of the torque of the dynamometer without detaching the torque sensor for independent calibration when the calibration device is applied, and can improve the effectiveness of the online calibration of the torque of the dynamometer compared with the existing method for independently calibrating and calibrating the torque sensor after detaching.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in further detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a structure of an online torque calibration device of a dynamometer;
FIGS. 2 and 3 are front and top views of a dynamometer torque on-line calibration device;
FIG. 4 is a side cross-sectional view of a dynamometer torque online calibration device;
FIG. 5 is a schematic view of the structure of the calibration arm;
FIG. 6 is an equivalent structural diagram of a calibration arm;
fig. 7 and 8 are schematic diagrams of equivalent movements of the calibration arm.
Reference numerals in the drawings of the specification include: the device comprises a base 1, a calibration support 2, a dynamometer 3, a rotating shaft 31 of the dynamometer, a dynamometer torque sensor 4, a calibration arm 5, a force arm 51, a mounting hole 52, a through hole 53, an actuator 6, a connecting clamp 7, a rotary transmission assembly 8, a bearing seat 81, a transmission rotating shaft 82, a coupler 83, a mounting sleeve 84, a sliding rail 91 and a movable sliding block 92.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the embodiments described are some, but not all, of the embodiments of the present application. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the skill of one of ordinary skill in the art without undue effort.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships that are conventionally put in use of the inventive product, are merely for convenience of description of the present application and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" merely means that its direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly tilted. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The following is a further detailed description of the embodiments:
the embodiment discloses an online calibration device for torque of a dynamometer.
As shown in fig. 1, 2 and 3, an online calibration device for torque of a dynamometer includes:
the base 1 is used for mounting a dynamometer 3 to be calibrated;
the dynamometer system comprises a dynamometer 3 and a dynamometer torque sensor 4 for measuring the torque of the dynamometer; the dynamometer rotating shaft 31 is connected with the dynamometer torque sensor 4 through a coupler.
The calibration support 2 is arranged on one side of the base corresponding to the rotating shaft of the dynamometer;
as shown in connection with fig. 4: the rotary transmission assembly 8 comprises a transmission rotating shaft 82 which is rotatably arranged on the calibration support and is coaxially arranged with the rotating shaft of the dynamometer, a coupler 83 which is used for coaxially and fixedly connecting the transmission rotating shaft 82 and the rotating shaft 31 of the dynamometer, and a mounting sleeve 84 which is coaxially and fixedly sleeved on the outer peripheral side of the transmission rotating shaft;
a calibration arm 5 fixedly connected to the outer peripheral side of the mounting sleeve 84;
the loading assembly is arranged on the calibration support and is in transmission connection with the calibration arm, and is used for loading linear displacement control to the calibration arm so that the calibration arm drives the transmission rotating shaft to rotate through the mounting sleeve, and further torque is transmitted to the rotating shaft of the dynamometer through the coupler.
In this embodiment, the linear displacement control means to drive the calibration arm to make a linear motion.
The application actually loads the calibration arm with linear displacement control in the vertical direction, namely drives the calibration arm to do linear motion in the vertical direction. When the calibration is carried out at the same rotating speed, the uniform rotation of the calibration arm can be realized through linear displacement control, the dynamic calibration of the torque at the fixed rotating speed is realized, and the influence of the inertia torque is eliminated.
In other preferred embodiments, the loading assembly can also load only the calibration arm with force control in the vertical direction (i.e. the calibration arm does not displace), where the force control is to directly obtain a torque value according to the loaded force, and when the rotation speed is not required to be fixed, the calibration can be performed by using the force control, but slow loading is required, otherwise, inertia torque is affected. Force control is similar to existing static calibration.
The rotation angle (rotation angle) of the calibration arm does not exceed 30 °.
In order to realize the online calibration of the torque of the dynamometer, a high-precision force sensor and a displacement sensor which are arranged on an actuator can be used for collecting a force value and a displacement value loaded by the actuator, then an actual torque signal loaded to a rotating shaft is calculated according to the force value and the displacement value loaded to a calibration arm, and finally the calibration of a torque sensor of a dynamometer system can be realized by combining a measured torque signal collected by the torque sensor through the existing means. The specific calibration method is the prior art.
According to the linear displacement control device, linear displacement control is applied to the calibration arm through the loading assembly, the calibration arm drives the transmission rotating shaft to rotate at a constant speed through the mounting sleeve and transmits torque to the rotating shaft of the dynamometer through the coupler, and the linear motion loaded by the loading assembly can be converted into constant-speed rotation (namely rotation control) of the rotation transmission assembly. On the one hand, the linear displacement control is converted into rotation control, and then the actual torque signal transmitted to the dynamometer can be calculated through the force value and the displacement value during loading linear displacement control so as to realize online torque calibration of the dynamometer, namely, a special calibration motor and a torque rotating speed sensor are not required to be arranged, the problem of precision of a new torque sensor is avoided, the structural complexity and the cost of a calibration device can be reduced, and further, the online torque calibration accuracy of the dynamometer can be improved in an auxiliary mode. On the other hand, the mode of converting the loading linear displacement control into the rotation control does not increase the axial dimension of the calibration device, is favorable for simplifying the structure of the calibration device, and can improve the installation convenience of the calibration device, and further can assist in improving the practicability of online calibration of the torque of the dynamometer.
The rotary transmission assembly does not generate structural interference with the dynamometer when the linear motion loaded by the loading assembly is converted into uniform rotation motion, and rotation control loaded by the dynamometer after conversion enables the torque calibration process of the dynamometer to be closer to reality, so that the consistency, efficiency and automation degree of online torque calibration of the dynamometer can be improved.
The calibration device can realize the online calibration of the torque of the dynamometer without detaching the torque sensor for independent calibration when the calibration device is applied, and can improve the effectiveness of the online calibration of the torque of the dynamometer compared with the existing method for independently calibrating and calibrating the torque sensor after detaching.
In the specific implementation process, the rotary transmission assembly 8 further comprises a bearing seat 81 fixedly arranged on the calibration support, and a bearing with an outer ring fixedly arranged on the bearing seat 81;
the transmission rotating shaft 82 is fixedly connected with the inner ring of the bearing coaxially.
The transmission rotating shaft is installed through the structure of the bearing seat and the bearing, so that the transmission rotating shaft can rotate freely, linear displacement control loaded by the loading assembly can be better converted into rotation control, and the torque calibration effect of the dynamometer can be guaranteed.
Referring to fig. 5, a mounting hole 52 corresponding to the outer peripheral side of the mounting sleeve is formed in the middle position of the calibration arm 5; the calibration arm 5 is coaxially and fixedly mounted on the outer peripheral side of the mounting sleeve 84 through the mounting hole 52, and takes the axis of the transmission shaft as the rotation center.
The calibration arm 5 comprises two force arm parts 51 which are symmetrical based on the vertical plane of the axis of the transmission rotating shaft; each force arm 51 of the calibration arm 5 is projected along the axial direction of the transmission shaft as an isosceles trapezoid wedge which gradually narrows away from the mounting sleeve 84, and the symmetry line of the isosceles trapezoid wedge obtained by the projection of the calibration arm is kept perpendicular to the axis of the transmission shaft, that is, the symmetry line of the isosceles trapezoid wedge passes through the rotation center (as shown in fig. 6).
The applicant finds that in the practical application process, the gravity of the calibration arm can influence the rotation of the transmission rotating shaft and the rotation of the dynamometer rotating shaft in the process of driving the rotation transmission assembly to act, so that the torque calculation in the calibration process is influenced, and the online calibration accuracy of the torque of the dynamometer is poor.
According to the torque calculation method, the calibration arm is arranged to be two force arm parts symmetrical relative to the vertical plane of the axis of the transmission rotating shaft, so that the balance of the rotation transmission assembly driven by the calibration arm during uniform rotation can be ensured, the influence of the gravity of the calibration arm on the torque calculation in the calibration process can be reduced as much as possible, and the accuracy of online calibration of the torque of the dynamometer can be improved in an auxiliary mode. Meanwhile, the calibration arm is arranged to be of a structure with a certain wedge angle and projected to be an isosceles trapezoid wedge block, and the purpose is to further reduce the influence of the gravity of the calibration arm on the calibration process, so that the accuracy and the practicability of the online calibration of the torque of the dynamometer can be improved in an auxiliary mode.
In the specific implementation process, a plurality of through holes 53 are arranged on the calibration arm 5 at intervals along the direction perpendicular to the axis of the mounting hole 52.
The through holes arranged at intervals are formed in the calibration arms, so that the weight of the calibration arms can be further reduced, the influence of the gravity of the calibration arms on the calibration process is reduced as much as possible, and meanwhile, the manufacturing materials and cost of the calibration arms can be saved.
In the specific implementation process, the loading assembly comprises an actuator 6 (hydraulic servo actuator) fixedly arranged on the calibration support and used for outputting linear displacement control, a high-precision force sensor and a displacement sensor which are arranged on the actuator 6 and used for collecting force values and displacement values loaded by the actuator 6 respectively, and a connecting clamp 7 used for connecting a displacement output end of the actuator 6 and the calibration arm 5.
The position on the calibration arm 5, which is in contact with the connecting clamp 7, is the loading position of the actuator;
the contact between the connecting clamp 7 and the calibration arm 5 is rolling contact of a needle roller, so that the calibration arm can rotate freely.
In this embodiment, the rolling contact of the needle roller is an existing contact mode.
The actuator loads displacement control in the vertical direction to the calibration arm through the connecting clamp, so that the calibration arm drives the transmission rotating shaft to rotate through the mounting sleeve, and further loads torque to the rotating shaft through the coupler.
The hydraulic servo actuator can be an existing hydraulic servo linear motor.
In this embodiment, the control of the output linear displacement of the actuator means to drive the calibration arm to make a linear motion.
The application actually loads the calibration arm with linear displacement control in the vertical direction, namely drives the calibration arm to do linear motion in the vertical direction. When the calibration is carried out at the same rotating speed, the uniform rotation of the calibration arm can be realized through linear displacement control, the dynamic calibration of the torque at the fixed rotating speed is realized, and the influence of the inertia torque is eliminated.
The loading assembly of above-mentioned structure is through the linear displacement control of actuator output vertical direction to pass through connecting jig and give the calibration arm, with the linear displacement control of loading vertical direction to the calibration arm, make the calibration arm can drive the transmission pivot through the installation sleeve and rotate at uniform velocity, and pass through the shaft coupling to the pivot transmission torque of dynamometer, can realize the uniform velocity rotation of converting the linear motion of loading assembly loading into rotatory drive assembly, and then the dynamic calibration of realization dynamometer torque that can be better, thereby can guarantee the practicality that the dynamometer torque was calibrated. Meanwhile, the loading assembly does not interfere with the dynamometer system, and rotation control of the converted loading to the dynamometer enables the torque calibration process of the dynamometer to be closer to reality, so that the consistency, efficiency and automation degree of online torque calibration of the dynamometer can be further improved.
In the specific implementation process, the online calibration device for the torque of the dynamometer further comprises:
the sliding rail 91 is fixedly arranged on one side of the base corresponding to the rotating shaft of the dynamometer, and the sliding direction is opposite to the dynamometer;
and the movable slide block 92 is arranged on the slide rail in a sliding manner and is used for fixedly mounting the calibration support 2.
The structure through slide rail and removal slider can drive whole calibration device and be close to or keep away from the removal of dynamometer machine direction on the base, the installation and the dismantlement of calibration device of being convenient for.
It should be noted that, since the calibration arm of the present application has a wedge angle, the vertical loading force and the loading torque, and the vertical loading speed and the loading angular speed are not simply linear and rotational, and are relatively complex, and the dynamic and kinematic analysis of the loading system, and the analysis and deduction of the relationship between the linear loading and the rotational loading are performed below.
The formula parameters designed in the present application are described in connection with fig. 6 and 7.
As shown in fig. 6, the calibration arm is projected to form an isosceles trapezoid wedge abcd. As shown in fig. 7, a schematic diagram of the movement of the calibration arm when rotating is shown, and the solid isosceles trapezoid wedge abcd is the initial horizontal position of the calibration arm. Assuming that when the force F in the vertical direction of the actuator is loaded upwards, the calibration arm is rotated counterclockwise by an angle θ, such as the position of the broken isosceles trapezoid wedge a 'b' c 'D' in fig. 7, the distance moved by the point D in the vertical direction is h, the force F at the point D of the calibration arm force receiving point (loading position) can be decomposed into a component force F1 perpendicular to the lower edge line of the calibration arm and a component force F2 along the lower edge line of the calibration arm, and the moment generated around the rotation center is counterclockwise (counterclockwise is defined as positive). Namely:
alpha: the wedge angle of the isosceles trapezoid wedge block projected by the calibration arm is shown.
R: the distance between one end of the lower bottom edge of the isosceles trapezoid wedge projected by the calibration arm and the axle center (rotation center) of the transmission shaft is shown, namely, one half of the length (the length from a to O in fig. 6) of the lower bottom edge of the isosceles trapezoid wedge.
D: the loading position of the actuator is indicated, namely the point where the actuator is contacted with the calibration arm through the connecting clamp.
l: the horizontal distance from the loading position of the actuator to the centre of rotation, i.e. the length a to D' in fig. 6, is indicated.
x: the vertical height of the loaded position of the actuator is indicated, i.e. the length D to D' in fig. 6.
θ: the rotating angle of the calibration arm under displacement control, namely the loading rotating angle is represented;
h: representing the value of displacement loaded by the actuator, i.e. the length D to D "in fig. 7.
The following analysis and deduction are made based on fig. 6 and 7:
the torque generated by the component force F1 is as shown in formula (1):
M 1 ＝F 1 ·R 1 (R 1 representing the length of E to D' in FIG. 7) (1)
The torque generated by the component force F2 is as shown in formula (2):
M 2 ＝F 2 ·R 2 (R 2 represents the length of E to O in FIG. 7) (2)
The magnitudes of the component forces F1 and F2 are as shown in the formulas (3) (4):
F 1 ＝F·cos(α+θ) (3)
F 2 ＝F·sin(α+θ) (4)
arms R2 and R1 are calculated as formula (5) (6):
R 2 ＝R·cosα (5)
R 1 ＝R 2 ·tanβ (6)
where β represents the magnitude of angle D "OE in FIG. 7, which magnitude is as in equation (7) according to the relationship:
wherein x and θ are represented by formulas (8), (9).
x＝l·tanα (8)
The actual torque signal M around the rotation center is shown as formula (10):
M＝M1+M2＝F·cos(α+θ)·R·cosα·tanβ+F·sin(α+θ)·R·cosα (10)
wherein: m represents the actual torque signal loaded; f represents the force value loaded by the actuator; m1 represents the torque generated by the force F1 of the loading force F perpendicular to the lower edge of the calibration arm; m2 represents the torque generated by the force component F2 of the loading force F along the lower edge of the calibration arm; alpha represents the wedge angle of an isosceles trapezoid wedge block projected by the calibration arm; r represents the distance between one end of the lower bottom edge of the isosceles trapezoid wedge projected by the calibration arm and the axle center (rotation center) of the transmission rotating shaft, namely one half of the length of the lower bottom edge of the isosceles trapezoid wedge; θ represents the rotation angle of the calibration arm under displacement control, namely the loading rotation angle; h represents the displacement value loaded by the actuator; a represents the horizontal distance from the loading position of the actuator to the rotation center; l represents the horizontal distance from the loading position of the actuator to the rotation center; x represents the vertical height of the loaded position of the actuator.
When the vertical force F of the actuator is downwards loaded, the whole calibration arm rotates clockwise, the stress point of the calibration arm is positioned at the point D on the upper edge line of the calibration arm, and the loading torque calculation formula can be deduced to be the same as that of the formula (10) (the torque and the rotation angle are positive anticlockwise and negative clockwise).
For the relationship between the displacement and the rotation angle of the vertical loading, as shown in fig. 8, the initial position of the calibration arm is horizontal (the middle trapezoid wedge abcd in the figure), the horizontal distance AB of the loading position of the actuator is l (i.e., as in the graph of aD ' in fig. 6), the vertical loading displacement DC of the actuator is h (i.e., as in the graph of dd″ in fig. 7), the counterclockwise rotation angle +.gof of the calibration arm is θ, and the rotation is shown as the dotted isosceles trapezoid wedge a ' b ' c'd ' in the graph of fig. 8. After the O point is passed and rotated, the vertical line of the lower edge line of the calibration arm is intersected with the E point, and the extension line of the CE is intersected with the initial vertical coordinate line at the A point.
As can be seen from fig. 8, the rotation angle θ can be expressed as formula (11):
θ＝∠AOE-α＝∠CAB-α (11)
let OE length be l 1 AE has a length of l 2 Length of EC is l 3 Length of OA is l 4 CB has a length of l 5 The following steps are:
l 1 ＝Rcosα (13)
l 4 2 ＝l 1 2 +l 2 2 (14)
l 1 /l＝l 2 /l 5 (15)
h＝l 5 +R-ltanα-l 4 (16)
when the angle θ is rotated, the displacement h to be applied is represented by the following formulas (12) to (16):
wherein: h represents the displacement value loaded by the actuator; l represents the horizontal distance from the loading position of the actuator to the rotation center; alpha represents the wedge angle of an isosceles trapezoid wedge block projected by the calibration arm; r represents the distance between one end of the lower bottom edge of the isosceles trapezoid wedge projected by the calibration arm and the axle center (rotation center) of the transmission rotating shaft, namely one half of the length of the lower bottom edge of the isosceles trapezoid wedge; θ represents the rotation angle of the calibration arm under displacement control, i.e. the loading rotation angle.
Similarly, it can be deduced that the calibration arm rotates clockwise when loaded downward, the rotation angle θ is a negative value, and the calculation is performed by the formula (18):
in order to reduce the influence of the gravity of the calibration arm on the calibration process as far as possible, the calibration arm is provided with a certain wedge angle and is projected into an isosceles trapezoid wedge block structure, however, as the calibration arm is provided with the wedge angle, the vertical loading force and the loading torque and the vertical loading speed and the loading angular speed are not in simple straight line and rotation relation any more, and related data cannot be accurately calculated in the actual calibration process. Aiming at the problem, the relation between the loading force and the torque of the calibration arm and the relation between the loading displacement and the rotation angle are calculated, so that the calculation of various parameters in the dynamic calibration process of the torque of the dynamometer can be effectively realized based on the calibration arm with the wedge angle, and the consistency, the efficiency and the degree of automation of the online calibration of the torque of the dynamometer can be further improved while the accuracy of the torque calibration of the dynamometer is effectively ensured.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the technical solution, and those skilled in the art should understand that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution, and all such modifications and equivalents are included in the scope of the claims of the present application.
Claims (8)
1. The utility model provides a dynamometer torque on-line calibration device which characterized in that includes:
the base is used for installing a dynamometer to be calibrated;
the calibration support is arranged on one side of the base corresponding to the rotating shaft of the dynamometer;
the rotary transmission assembly comprises a transmission rotating shaft which is rotatably arranged on the calibration support and is coaxially arranged with the rotating shaft of the dynamometer, a coupler which is used for coaxially and fixedly connecting the transmission rotating shaft and the rotating shaft of the dynamometer, and a mounting sleeve which is coaxially and fixedly sleeved on the outer peripheral side of the transmission rotating shaft;
the calibration arm is fixedly connected with the outer peripheral side of the mounting sleeve;
the loading assembly is arranged on the calibration support and is in transmission connection with the calibration arm, and is used for loading linear displacement control to the calibration arm so that the calibration arm drives the transmission rotating shaft to rotate through the mounting sleeve, and further torque is transmitted to the rotating shaft of the dynamometer through the coupler.
2. The dynamometer torque on-line calibration device of claim 1, wherein: the rotary transmission assembly further comprises a bearing seat fixedly arranged on the calibration support and a bearing with an outer ring fixedly arranged on the bearing seat;
the transmission rotating shaft is fixedly connected with the inner ring of the bearing in a coaxial mode.
3. The dynamometer torque on-line calibration device of claim 1, wherein: a mounting hole which is matched with the outer peripheral side of the mounting sleeve is formed in the middle of the calibration arm; the calibration arm is coaxially and fixedly arranged on the outer peripheral side of the mounting sleeve through the mounting hole, and the axis of the transmission rotating shaft is used as a rotating center.
4. The dynamometer torque on-line calibration device of claim 3, wherein: the calibration arm comprises two force arm parts which are symmetrical based on the vertical plane of the axis of the transmission rotating shaft; each arm part of the calibration arm is projected along the axis direction of the transmission rotating shaft to form isosceles trapezoid wedges which gradually narrow towards the direction away from the installation sleeve, and the symmetry line of the isosceles trapezoid wedges obtained by the projection of the calibration arm is vertical to the axis of the transmission rotating shaft.
5. The dynamometer torque on-line calibration device of claim 3, wherein: and a plurality of through holes are formed in the calibration arm at intervals along the direction perpendicular to the axis of the mounting hole.
6. The dynamometer torque on-line calibration device of claim 3, wherein: the loading assembly comprises an actuator fixedly arranged on the calibration support and used for outputting linear displacement control, and a connecting clamp used for connecting a displacement output end of the actuator and the calibration arm.
7. The on-line calibration device for torque of dynamometer of claim 6, wherein: the contact between the connecting clamp and the calibration arm is rolling contact of a needle roller.
8. The dynamometer torque on-line calibration device of claim 1, further comprising:
the sliding rail is fixedly arranged on one side of the base corresponding to the rotating shaft of the dynamometer, and the sliding direction is opposite to the dynamometer;
and the movable slide block is arranged on the slide rail in a sliding manner and is used for fixedly mounting the calibration support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320978405.7U CN220437649U (en) | 2023-04-26 | 2023-04-26 | Online calibration device for torque of dynamometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320978405.7U CN220437649U (en) | 2023-04-26 | 2023-04-26 | Online calibration device for torque of dynamometer |
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| Publication Number | Publication Date |
|---|---|
| CN220437649U true CN220437649U (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320978405.7U Active CN220437649U (en) | 2023-04-26 | 2023-04-26 | Online calibration device for torque of dynamometer |
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| Country | Link |
|---|---|
| CN (1) | CN220437649U (en) |
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- 2023-04-26 CN CN202320978405.7U patent/CN220437649U/en active Active
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