CN109596048B - Torque sensor assembly detection device of electric power steering system - Google Patents
Torque sensor assembly detection device of electric power steering system Download PDFInfo
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- CN109596048B CN109596048B CN201811469534.3A CN201811469534A CN109596048B CN 109596048 B CN109596048 B CN 109596048B CN 201811469534 A CN201811469534 A CN 201811469534A CN 109596048 B CN109596048 B CN 109596048B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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Abstract
The invention discloses a torque sensor assembly detection device of an electric power steering system, which comprises a torque sensor assembly and a horizontal detection table with a through hole, wherein a positioning seat corresponding to the through hole is fixedly arranged on the detection table; the torque sensor assembly comprises a first linear motor, a second linear motor, a third linear motor, a loading mechanism and a control module, wherein the first linear motor is fixedly connected with an axial detection module, the second linear motor is fixedly connected with a radial detection module, the loading mechanism is fixedly arranged below a detection table, and the loading mechanism is connected with a worm wheel shaft. The invention can detect the axial and radial runout of the torque sensor assembly before the worm wheel shaft and the torsion bar are drilled.
Description
Technical Field
The invention relates to the technical field of assembly line detection, in particular to a detection device for a torque sensor assembly of an electric power steering system.
Background
The torque sensor assembly is one of core components of an electric power-assisted system, the torque sensor assembly needs to be detected before a worm gear shaft and a torsion bar of the torque sensor component are punched and a shaft pin is pressed on an assembly line, and after the worm gear shaft and the torsion bar of the torque sensor component are punched, two punched components need to correspond one to one. If the deviation of the assembly process occurs and exceeds the specified range, the characteristic of the sensor assembly is liable to be poor, and in serious cases, the parts are completely scrapped. Therefore, before the torque sensor assembly is punched and pinned, the assembling process deviation of the torque sensor assembly needs to be detected so as to be within a specified range.
Fig. 1 is a schematic structural diagram of a measured torque sensor assembly, and fig. 2 is a sectional view of the measured torque sensor assembly. The torque sensor assembly 100 is composed of a lower steering shaft 101, a worm gear shaft 102, a torsion bar 103, a sliding sleeve 104 and a return spring 105 which are coaxial, the lower steering shaft 101 and the worm gear shaft 102 are connected together through the torsion bar 103 and an internal limiting mechanism, before drilling, one end of the torsion bar 103 is pressed into a central hole of the lower steering shaft 101 in an interference mode through a cold extrusion spline, the other end of the torsion bar 103 is in sliding fit with the central hole of the worm gear shaft 102, the return spring 105 and the sliding sleeve 104 are sleeved on a spiral rolling groove 106 on the outer side of the worm gear shaft 102, balls are installed in the spiral rolling groove 106, when the worm gear shaft 102 and the lower steering shaft 101 rotate relatively, the sliding sleeve 104 moves along the spiral rolling groove 106 to generate axial displacement, and the limiting mechanism allows the angle of relative rotation between the lower.
The positioning mechanism is used for automatically searching the midpoint 0 degrees, after positioning is finished, holes are drilled at one ends of the worm gear shaft 102 and the torsion bar 103 through the drilling mechanism, and the worm gear shaft 102 is connected with the torsion bar 103 through a shaft pin 107.
It is necessary to measure the axial runout of the sliding sleeve 104 and the coaxiality of the worm-wheel shaft 102 and the steering lower shaft 101 before drilling. When the measurement is qualified, holes are drilled in the worm gear shaft 102 and the torsion bar 103, and the worm gear shaft 102 and the torsion bar 103 are connected through interference fit of the shaft pin 107 and the drilled holes.
In the production practice, the problem that the whole torque sensor assembly 100 is scrapped due to the fact that a certain mechanical part of the torque sensor assembly 100 has a machining process problem generally exists, and parts after drilling form a one-to-one correspondence relationship, so that the mechanical part with the problem cannot be replaced after drilling. Therefore, it is important to accurately detect the axial run-out and radial run-out of the sensor unit assembly before drilling.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a torque sensor assembly detection device for an electric power steering system, which can detect axial run-out and radial run-out of a torque sensor assembly before drilling a worm wheel shaft and a torsion bar.
The technical scheme adopted by the invention for solving the technical problems is as follows: a torque sensor assembly detection device of an electric power steering system comprises a torque sensor assembly, wherein the torque sensor assembly comprises a lower steering shaft, a worm-gear shaft, a torsion bar, a sliding sleeve and a return spring which are coaxial, and the torque sensor assembly further comprises a horizontal detection table with a through hole, a positioning seat corresponding to the through hole is fixedly arranged on the detection table, the torque sensor assembly is vertical, the worm-gear shaft is downwards arranged on the positioning seat, one side of the positioning seat is provided with a bracket fixed on the detection table, a vertical first linear motor is fixedly arranged on the bracket, the first linear motor is fixedly connected with a first loading motor, a first spline sleeve is connected with a shaft of the first loading motor, the first linear motor can drive the first loading motor to move up and down, and the first spline sleeve is matched with the lower steering shaft; a second linear motor and a third linear motor which are fixedly connected with a detection platform are respectively arranged on two sides of the torque sensor assembly, the second linear motor is fixedly connected with an axial detection module, the third linear motor is fixedly connected with a radial detection module, a loading mechanism connected with a worm gear shaft is fixedly arranged below the detection platform, the loading mechanism comprises a loading frame fixedly arranged below the detection platform, the loading frame is sequentially connected with a coaxial second loading motor, a first elastic coupling, a torque sensor, a second elastic coupling and a second spline sleeve from bottom to top, and the second spline sleeve is matched with the worm gear shaft;
the control module is respectively and electrically connected with the first linear motor, the second linear motor, the third linear motor, the first loading motor, the second loading motor, the radial detection module, the axial detection module, the torque sensor and the touch screen.
The torque sensor assembly detection device for the electric power steering system is characterized in that the axial detection module is an axial grating ruler displacement sensor, and the radial detection module is a radial grating ruler displacement sensor.
In the detection device for the torque sensor assembly of the electric power steering system, the axial grating reading head of the axial grating ruler displacement sensor and the radial grating reading head of the radial grating ruler displacement sensor are both flexibly connected with the sliding sleeve.
The torque sensor assembly detection device for the electric power steering system is characterized in that a fine adjustment device is further arranged on the axial grating ruler displacement sensor.
In the above detection device for the torque sensor assembly of the electric power steering system, the bracket is further provided with a limit switch corresponding to the first linear motor.
The detection device for the torque sensor assembly of the electric power steering system is characterized in that an extension line of an axis of the second linear motor does not intersect with an axis of the torque sensor assembly, and an extension line of an axis of the third linear motor intersects with the axis of the torque sensor assembly.
In the detection device for the torque sensor assembly of the electric power steering system, the first linear motor, the second linear motor and the third linear motor are all slider type linear motors.
The detection device for the torque sensor assembly of the electric power steering system is characterized in that the control module is FX 2N.
The invention has the beneficial effects that:
the detection device adopts the grating ruler displacement sensor to detect the axial and radial runout of the torque sensor assembly, controls the detection system through the control module, sends a display result to the touch screen to display, and receives a signal and sends a detection instruction through the touch screen.
The invention has high detection precision and simple operation, and can complete no-load dynamic measurement and loading dynamic measurement.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
FIG. 1 is a schematic structural view of a torque sensor assembly;
FIG. 2 is a cross-sectional view of a torque sensor assembly;
FIG. 3 is a schematic structural diagram of a torque sensor assembly detection device according to the present invention;
FIG. 4 is a left side view of FIG. 3;
FIG. 5 is a schematic block diagram of a torque sensor assembly detection device of the present invention.
Wherein, the reference numbers:
1. a detection table; 11. positioning seats; 2. a support; 21. a first linear motor; 22. a first loading motor; 23. a first spline housing; 24. a limit switch; 3. a second linear motor; 31. an axial detection module; 311. an axial grating reader; 312. a fine adjustment device; 4. a third linear motor; 41. a radial detection module; 411. a radial grating read head; 5. a loading mechanism; 51. a loading frame; 52. a second loading motor; 53. a first resilient coupling; 54. a torque sensor; 55. a second resilient coupling; 56. a second spline housing; 6. a control module; 7. a touch screen;
100. a torque sensor assembly; 101. steering the lower shaft; 102. a worm gear shaft; 103. a torsion bar; 104. a sliding sleeve; 105. a return spring; 106. spirally rolling grooves; 107. a pin.
Detailed Description
The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:
as shown in fig. 1-5, the torque sensor assembly detection device of the electric power steering system of the present invention comprises a torque sensor assembly 100, wherein the torque sensor assembly 100 is composed of a lower steering shaft 101, a worm gear shaft 102, a torsion bar 103, a sliding sleeve 104, and a return spring 105, which are coaxial, and further comprises a horizontal detection platform 1 with a through hole (not shown in the figure), a positioning seat 11 corresponding to the through hole is fixedly arranged on the detection platform 1, the torque sensor assembly 100 is vertical, the worm gear shaft 102 is downwardly arranged on the positioning seat 11, a bracket 2 fixed on the detection platform 1 is arranged on one side of the positioning seat 11, a vertical first linear motor 21 is fixedly arranged on the bracket 2, the first linear motor 21 is fixedly connected with a first loading motor 22, a first spline housing 23 is connected with a shaft of the first loading motor 22, because the first linear motor 21 can make a slide block on the first linear motor 21 make a linear motion along a linear guide rail thereof, therefore, the first linear motor 21 can drive the first loading motor 22 to move up and down along with the sliding block, and the first spline housing 23 is matched with the steering lower shaft 101; a second linear motor 3 and a third linear motor 4 which are fixedly connected with the detection platform 1 are respectively arranged at two sides of the torque sensor assembly 100, the second linear motor 3 is fixedly connected with the axial detection module 31, the third linear motor 4 is fixedly connected with the radial detection module 41, a loading mechanism 5 connected with the worm gear shaft 102 is further fixedly arranged below the detection platform 1, the loading mechanism 5 comprises a loading frame 51 fixedly arranged below the detection platform 1, the loading frame 51 is sequentially connected with a coaxial second loading motor 52, a first elastic coupling 53, a torque sensor 54, a second elastic coupling 55 and a second spline sleeve 56 from bottom to top, and the second spline sleeve 56 is matched with the worm gear shaft 102;
the control module 6 is electrically connected with the first linear motor 21, the second linear motor 3, the third linear motor 4, the first loading motor 22, the second loading motor 52, the radial detection module 41, the axial detection module 31, the torque sensor 54 and the touch screen 7 respectively.
In this embodiment, the axial detection module 31 is an axial grating scale displacement sensor, and the radial detection module 41 is a radial grating scale displacement sensor.
The axial grating reading head 311 of the axial grating ruler displacement sensor and the radial grating reading head 411 of the radial grating ruler displacement sensor are flexibly connected with the sliding sleeve 104.
The axial grating ruler displacement sensor is further provided with a fine adjustment device 312, so that the axial grating reading head 311 can be in flexible contact with the sliding sleeve 104.
The bracket 2 is further provided with a limit switch 24 corresponding to the first linear motor 21, when the first linear motor 21 moves downwards to drive the first spline housing 23 fixedly connected to the first loading motor 22 to be sleeved with the steering lower shaft 101, the limit switch 24 can ensure that the first spline housing 23 moves downwards and just sleeves with the steering lower shaft 101, and then the first linear motor 21 stops working.
The extension line of the axis of the second linear motor 3 does not intersect with the axis of the torque sensor assembly 100, and the extension line of the axis of the third linear motor 4 intersects with the axis of the torque sensor assembly 100. This ensures that the axial detection module 31 can move to the vicinity of the torque sensor assembly 100 along with the second linear motor 3 when detecting the axial runout of the torque sensor assembly 100, and the fine adjustment device 312 enables the axial grating reading head 311 of the axial grating ruler displacement sensor to be attached to the sliding sleeve 104. The radial detection module 41 can move with the third linear motor 4 near the torque sensor assembly 100, so that the radial grating reading head 411 of the radial grating ruler displacement sensor is attached to the sliding sleeve 104 in the radial direction of the sliding sleeve 104.
In the embodiment, the first linear motor 21, the second linear motor 3 and the third linear motor 4 are all slide block type linear motors, and the slide blocks can slide on linear guide rails; control module model FX 2N.
The specific working process of the invention is as follows:
as shown in fig. 3 and 4, firstly, a worm gear shaft 102 of a torque sensor assembly 100 is placed downwards on the positioning seat 11, the worm gear shaft 102 penetrates through a through hole to be sleeved with a second spline housing 56 of the loading mechanism 5, after the torque sensor assembly 100 is installed on the positioning seat 11, the first loading motor 22 moves downwards along with a sliding block of the first linear motor 21, and when the sliding block of the first linear motor 21 moves downwards to a limit switch 24, the first linear motor 21 stops working, so that the first spline housing 23 is sleeved with the steering lower shaft 101; the slide block of the second linear motor 3 drives the axial detection module 31 to move to the worm wheel shaft 102, the slide block of the third linear motor 4 drives the radial detection module 41 to move to the worm wheel shaft 102, and the axial grating reading head 311 and the radial grating reading head 411 are in flexible contact with the sliding sleeve 104, so that in the movement process of the sliding sleeve 104, the axial grating reading head 311 and the radial grating reading head 411 are always in contact with the sliding sleeve 104, the test requirement of a grating ruler displacement sensor is met, and corresponding parameter changes are fed back.
The measuring device of the invention can perform static measurement:
static measurement: when first loading motor 22 is not activated and second loading motor 52 drives worm gear shaft 102 to rotate within a range of ± 8 °, sliding sleeve 104 will move in the axial direction when worm gear shaft 102 rotates, which is the reflected range of movement of the mechanical components of torque sensor assembly 100. Whether the displacement is within a predetermined range is measured and detected by the axial direction detection module 31.
During the rotation of the worm wheel shaft 102, the displacement curve can be seen through the touch screen 7 according to the change value of the torque sensor 54, and whether the axial limit displacement is reached is determined.
The dynamic measurement of the measuring equipment comprises no-load dynamic measurement and loading dynamic measurement:
during the loading dynamic measurement, the first loading motor 22 and the second loading motor 52 rotate in opposite directions before rotating synchronously, when the torque reaches a set value, the first loading motor 22 and the second loading motor 52 rotate synchronously again, and the worm-gear shaft 102 and the steering lower shaft 101 can keep the set torque. During the rotation, the axial detection module 31 and the radial detection module 41 measure the run-out of the sliding sleeve 104.
The control module 6 controls the first loading motor 22 and the second loading motor 52 to rotate according to the set torque value, and when the torque output of the torque sensor 54 is detected to reach the set value, the control module 6 controls the first loading motor 22 and the second loading motor 52 to start synchronous rotation.
During the no-load dynamic measurement, the first loading motor 22 and the second loading motor 52 rotate at the same speed and in the same direction, and the axial run-out and the radial run-out of the sliding sleeve 104 can be measured and formed into a data file.
When the measuring result of the axial and radial runout is within the process requirement range, the procedures of drilling and pressing in the shaft pin can be carried out, otherwise, the torque sensor part assembly needs to be replaced and adjusted according to the measuring result.
The invention can completely measure the motion state of the torque sensor assembly 100 in the actual use process, and carry out the measurement of axial and radial runout, thereby simplifying the measurement process.
The touch screen 7 and the control module 6 are communicated through RS485, the touch screen 7 can receive information and start a measurement instruction, the axial detection module 31 and the radial detection module 41 can measure precision to meet the technical precision requirement of the measurement system, corresponding digital pulses are sent to the control module 6, and the control module 6 captures and collects the digital pulses, calculates and analyzes the digital pulses and outputs the digital pulses to the touch screen 7.
Through the cooperation of second linear electric motor 3, third linear electric motor 4, axial detection module 31 and radial detection module 41 use, the axial of detectable sliding sleeve 104 is beated and is beated radially, divides into different grades with the cooperation of torque sensor assembly 100 part according to the numerical value size of beating, is convenient for carry out the part change in later stage to torque sensor assembly 100 that has the problem.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (6)
1. A torque sensor assembly detection device of an electric power steering system comprises a torque sensor assembly, wherein the torque sensor assembly is composed of a lower steering shaft, a worm wheel shaft, a torsion bar, a sliding sleeve and a return spring which are coaxial, and is characterized by further comprising a horizontal detection table with a through hole, a positioning seat corresponding to the through hole is fixedly arranged on the detection table, and the torque sensor assembly
The vertical positioning seat is arranged on the positioning seat with the worm wheel shaft downward, a bracket fixed on the detection table is arranged on one side of the positioning seat, a vertical first linear motor is fixedly arranged on the bracket and fixedly connected with a first loading motor, a first spline housing is connected with a shaft of the first loading motor, the first linear motor can drive the first loading motor to move up and down, and the first spline housing is matched with the steering lower shaft; a second linear motor and a third linear motor which are fixedly connected with a detection platform are respectively arranged on two sides of the torque sensor assembly, the second linear motor is fixedly connected with an axial detection module, the third linear motor is fixedly connected with a radial detection module, a loading mechanism connected with a worm gear shaft is fixedly arranged below the detection platform, the loading mechanism comprises a loading frame fixedly arranged below the detection platform, the loading frame is sequentially connected with a coaxial second loading motor, a first elastic coupling, a torque sensor, a second elastic coupling and a second spline sleeve from bottom to top, and the second spline sleeve is matched with the worm gear shaft;
the axial detection module is an axial grating ruler displacement sensor, and the radial detection module is a radial grating ruler displacement sensor;
the axial grating reading head of the axial grating ruler displacement sensor and the radial grating reading head of the radial grating ruler displacement sensor are flexibly connected with the sliding sleeve;
the control module is respectively and electrically connected with the first linear motor, the second linear motor, the third linear motor, the first loading motor, the second loading motor, the radial detection module, the axial detection module, the torque sensor and the touch screen.
2. The apparatus for detecting the torque sensor assembly of an electric power steering system according to claim 1, wherein the axial grating displacement sensor further comprises a fine adjustment device.
3. The apparatus of claim 1, wherein the bracket further includes a limit switch corresponding to the first linear motor.
4. The apparatus of claim 1, wherein an extension of the axis of the second linear electric motor does not intersect the axis of the torque sensor assembly, and an extension of the axis of the third linear electric motor intersects the axis of the torque sensor assembly.
5. The apparatus of claim 1, wherein the first linear motor, the second linear motor, and the third linear motor are all slider-type linear motors.
6. The electric power steering system torque sensor assembly detection device of claim 1, wherein the control module is model number FX 2N.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811469534.3A CN109596048B (en) | 2018-11-28 | 2018-11-28 | Torque sensor assembly detection device of electric power steering system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811469534.3A CN109596048B (en) | 2018-11-28 | 2018-11-28 | Torque sensor assembly detection device of electric power steering system |
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| CN109596048A CN109596048A (en) | 2019-04-09 |
| CN109596048B true CN109596048B (en) | 2021-07-06 |
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| CN110579328B (en) * | 2019-10-10 | 2024-04-09 | 浙江大学台州研究院 | Reverse impact detection table for electronic steering power-assisted assembly |
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| CN201291899Y (en) * | 2008-09-08 | 2009-08-19 | 比亚迪股份有限公司 | Power-assisted steering mechanism and intermediate shaft |
| CN204495382U (en) * | 2015-01-07 | 2015-07-22 | 广东和氏自动化技术股份有限公司 | Automobile rotary valve assembly and nut assembly synthesize intelligent detection equipment |
| CN205520745U (en) * | 2016-04-07 | 2016-08-31 | 嘉兴压力容器厂 | Electricity main shaft mechatronic detecting system |
| CN207964277U (en) * | 2018-04-11 | 2018-10-12 | 重庆理工大学 | A kind of speed changer high speed motion transmission error test measuring device |
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| JP2000155073A (en) * | 1998-11-24 | 2000-06-06 | Nsk Ltd | Rotational accuracy/dynamic torque measuring device for radial rolling bearing |
| CN201307059Y (en) * | 2008-12-08 | 2009-09-09 | 洛阳轴研科技股份有限公司 | Dynamic simulation tester for plastic supporting bearing |
| CN105750892A (en) * | 2016-04-07 | 2016-07-13 | 内蒙古工业大学 | Automatic screw assembly-in-place detection system on basis of real-time image processing |
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| Title |
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| 汽车转向拉杆接头总成试验台设计;高帅;《中国优秀硕士学位论文库》;20151201;全文 * |
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