WO2022242160A1

WO2022242160A1 - Transfer case assembly clutch axial pressure calibration apparatus and calibration method thereof

Info

Publication number: WO2022242160A1
Application number: PCT/CN2021/139475
Authority: WO
Inventors: 屠有余; 樊雪来; 刘振宇; 张艳彬; 胡文越; 王文渝; 张义财; 倪家傲
Original assignee: 中国第一汽车股份有限公司
Priority date: 2021-05-20
Filing date: 2021-12-20
Publication date: 2022-11-24
Also published as: CN113295406A; CN113295406B

Abstract

A transfer case assembly clutch axial pressure calibration apparatus (2) and a calibration method thereof, the transfer case assembly clutch axial pressure calibration apparatus (2) comprising a force-bearing strut (21), a base (22), and a plurality of strain gauges (231, 232, 233, 234), the force-bearing strut (21) and the base (22) both being rotatably arranged on the output shaft (12) and the axial position of the output shaft (12) and the base (22) being fixed, the force-bearing strut (21) being connected to a driven friction plate assembly (172) and abutting along the axial direction of the output shaft (12), so that the force-bearing strut (21) can directly bear the axial force applied from a wet clutch (17) and can rotate synchronously with the driven friction plate assembly (172). The axial force on the clutch (17) is analysed by means of the plurality of strain gauges (231, 232, 233, 234) measuring the strain force, and then the transfer case assembly (1) is calibrated by means of detecting the position of the motor, ensuring the high precision, reliability, and practicability of the results.

Description

A clutch axial pressure calibration device and calibration method of transfer case assembly

This application claims priority to a Chinese patent application with application number 202110553934.8 filed with the China Patent Office on May 20, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of vehicles, for example, to a clutch axial pressure calibration device of a transfer case assembly and a calibration method thereof.

Background technique

The four-wheel drive splitter needs the axial pressure generated by the clutch to distribute the torque, and the axial pressure needs to control the rotation of the motor, drive the worm gear and the worm to rotate, and then separate a bunch of steel ball cam plates with spiral rising grooves. Axial pressure is generated and pressed against the clutch pressure plate, so that the clutch is closed and the torque is distributed to the front axle. In the process of vehicle assembly, it is necessary to accurately test the positive pressure transmitted by this series of mechanical structures under the working state of the clutch, so as to evaluate the clutch performance and the torque transmission accuracy of the four-wheel drive transfer case.

In the related technology, the theoretical calculation value is usually obtained by calculating the worm gear and the steel ball cam plate, or directly calibrate the motor control position and the transmission torque to obtain the overall calibration value, eliminating the need for accurate calibration in the middle segment, and the above-mentioned Theoretical calculated values and overall calibration values are used for parameter setting in the four-wheel drive control system. However, this method all indirectly measures and calculates the axial pressure generated by the clutch, which has poor reliability and poor practicability.

Contents of the invention

The present application provides a clutch axial pressure calibration device of a transfer case assembly and a calibration method thereof to solve the problems in the related art that the axial pressure generated by the clutch is indirectly measured and calculated, and the reliability and practicability are poor.

On the one hand, the present application provides a clutch axial pressure calibration device for a transfer case assembly, the clutch axial pressure calibration device for a transfer case assembly is applied to a transfer case assembly, and the transfer case assembly includes a housing, Output shaft, driven ball cam, driving ball cam, worm gear, worm, motor, driving friction plate assembly and driven friction plate assembly, the output shaft is rotatably arranged in the housing, the driven ball cam, the driving ball The cam, the worm gear, the driving friction plate assembly and the driven friction plate assembly are sequentially sleeved on the output shaft along the axial direction of the output shaft, the driven ball cam is fixedly connected to the output shaft, The active ball cam, the worm gear and the active friction plate assembly are all in sliding fit with the output shaft, the worm gear and the active friction plate assembly are rotationally connected, and the worm gear and the active friction plate assembly are along the The axial abutment of the output shaft, the active friction plate assembly is keyed to the output shaft, the motor is in drive connection with the worm, the worm meshes with the worm gear, and the worm gear can drive the active The ball cam rotates so that the driving ball cam moves along the axial direction of the output shaft relative to the driven ball cam, and the driving ball cam can drive the worm gear and the driving friction plate assembly synchronously along the Axial movement of the output shaft; the transfer case assembly clutch axial pressure calibration device includes:

Stressed strut, which is rotatably sleeved on the output shaft and is located on the side of the driven friction plate assembly away from the turbine, and can be moved along with the driven friction plate assembly along the Axial abutment of the output shaft, and the driven friction plate assembly is connected to the stressed pillar through transmission;

The base is rotatably sleeved on the output shaft, and the base can be fixed relative to the output shaft in the direction along the axial direction of the output shaft, and the base abuts against the stressed support , and the base and the driven friction plate assembly are respectively located on both sides of the stressed pillar;

A plurality of strain gauges, the plurality of strain gauges are evenly distributed along the circumferential direction of the stressed pillar, and each strain gauge is arranged along the radial direction of the stressed pillar.

This embodiment also provides a calibration method for the clutch axial pressure calibration device of the transfer case assembly described in any of the above schemes, including:

Provide four strain gauges, two quartz glass sheets, force-bearing pillars and bases, the four strain gauges include the first strain gauge, the second strain gauge, the third strain gauge and the fourth strain gauge, and the two quartz The glass sheets are respectively a first quartz glass sheet and a second quartz glass sheet, and the first quartz glass sheet and the second quartz glass sheet are respectively arranged on the stressed pillars, and the four strain gauges are placed along the The circumferential direction of the stressed pillar is uniformly arranged on the stressed pillar, and the positions where the first strain gauge and the second strain gauge are installed on the stressed pillar correspond to the thickness of the stressed pillar is L1, The position where the third strain gauge and the fourth strain gauge are installed on the stressed pillar corresponds to the thickness of the stressed pillar is L2, L1 is not equal to L2, and the first strain gauge and the stressed pillar A first quartz glass sheet is arranged between the force pillars, and a second quartz glass sheet is arranged between the third strain gauge and the stressed pillar; the first strain gauge and the fourth strain gauge are connected by wires and Constitute an adjacent bridge Wheatstone bridge road, connect the second strain gauge and the third strain gauge through wires to form an adjacent bridge Wheatstone bridge road, respectively in the first strain gauge, the second strain gauge The surfaces of the second strain gauge, the third strain gauge, and the fourth strain gauge are coated with protective glue, and a plurality of wires are fixed;

The transfer case assembly described in the above solution is provided, and the transfer case assembly also includes a driving sprocket fixedly arranged on the output shaft, the driving sprocket is sleeved on the output shaft and connected to the driven friction plate assembly connect;

Use the transfer case assembly clutch axial pressure calibration device to replace the drive sprocket; disassemble the drive sprocket, and install the assembled transfer case assembly clutch axial pressure calibration device on the the output shaft, the stressed strut is connected with the driven friction plate assembly and abuts along the axial direction of the output shaft, the base abuts against the stressed strut along the axial direction of the output shaft and the The base is rotatably arranged on the output shaft, and the relative position between the base and the output shaft along the axial direction of the output shaft remains stable;

The wires of the two adjacent bridges Whiston Bridge Road are respectively connected to the data acquisition instrument, and the angle sensor installed on the motor and used to detect the rotation angle of the motor is connected to the data acquisition instrument;

Perform a calibration test.

Description of drawings

Fig. 1 is the structural representation of transfer case assembly in the embodiment of the present application;

Fig. 2 is a schematic structural view of the transfer case assembly and the clutch axial pressure calibration device of the transfer case assembly in the embodiment of the present application;

Fig. 3 is the sectional view of transfer case assembly and transfer case assembly clutch axial pressure calibration device in the embodiment of the application;

Figure 4 is a cross-sectional view of the transfer case assembly in the embodiment of the present application;

Fig. 5 is a schematic structural view of the stressed pillar in the embodiment of the present application;

Fig. 6 is a schematic structural diagram of the adjacent bridge Whiston Bridge Road in the embodiment of the present application.

In the picture:

1. Transfer case assembly; 11. Housing; 12. Output shaft; 13. Driven ball cam; 14. Driving ball cam; 15. Turbine; 16. Worm; 17. Wet clutch; 171. Active friction plate assembly; 172, driven friction plate assembly; 173, spring; 18, driving sprocket;

2. Axial pressure calibration device for the clutch of the transfer case assembly; 21. Forced pillar; 211. First force-bearing body; 212. Second force-bearing body; 213. Connecting body; 2131. First test area; 2132. 22, the base; 231, the first strain gauge; 232, the second strain gauge; 233, the third strain gauge; 234, the fourth strain gauge; 241, the first quartz glass plate; 242, the second quartz glass sheet

31. First wire; 32. Second wire; 33. Third wire; 34. Fourth wire; 35. Junction box; 36. Data acquisition instrument; 37. Controller; 38. Angle sensor.

Detailed ways

The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific orientation construction and operation, therefore should not be construed as limiting the application. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance. Wherein, the terms "first position" and "second position" are two different positions, and "above", "above" and "above" the first feature on the second feature include that the first feature is on the second feature. Directly above and obliquely above, or simply means that the first feature level is higher than the second feature. "Below", "under" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are only for explaining the present application, and should not be construed as limiting the present application.

As shown in Figures 1-6, this embodiment provides a transfer case assembly clutch axial pressure calibration device, the transfer case assembly clutch axial pressure calibration device 2 can directly test the The axial force suffered by the wet clutch 17 is detected.

As shown in FIGS. 1 and 3 , the transfer case assembly 1 includes a housing 11 , an output shaft 12 , a driven ball cam 13 , a driving ball cam 14 , a turbine 15 , a worm 16 , a motor and a wet clutch 17 . Wherein, the wet clutch 17 includes a driving friction plate assembly 171 and a driven friction plate assembly 172 . The output shaft 12 is rotatably arranged on the casing 11, and the driven ball cam 13, the driving ball cam 14, the worm gear 15, the driving friction plate assembly 171 and the driven friction plate assembly 172 are sequentially sleeved on the output shaft 12 along the axial direction of the output shaft 12, from The moving ball cam 13 is fixedly connected with the output shaft 12, the driving ball cam 14, the worm gear 15 and the active friction plate assembly 171 are all in sliding fit with the output shaft 12, the worm gear 15 and the active friction plate assembly 171 are rotationally connected and the worm gear 15 and the active friction plate assembly 171 abuts along the axial direction of the output shaft 12 , for example, the turbine 15 and the active friction plate assembly 171 are rotationally connected through an axial bearing, and the turbine 15 and the active friction plate assembly 171 abut through an axial bearing. The active friction plate assembly 171 is keyed to the output shaft 12, the motor is connected to the worm 16, the worm 16 meshes with the worm gear 15, and the worm gear 15 can drive the driving ball cam 14 to rotate, and then the driving ball cam 14 can be outputted along the driven ball cam 13. The axial movement of the shaft 12, because the driven ball cam 13 is fixed on the output shaft 12, so the driving ball cam 14 drives the worm gear 15 to move away from the driven ball cam 13, because the worm gear 15 and the driving friction plate assembly 171 move along the output shaft 12, so during this process, the turbine 15 will drive the active friction plate assembly 171 to move synchronously along the axial direction of the output shaft 12, so as to provide a certain axial pressure for the active friction plate assembly 171, so that the active friction plate The friction plates of the assembly 171 can abut against the friction plates of the driven friction plate assembly 172 to realize the combination of the wet clutch 17 . Wherein, the driving ball cam 14 and the driven ball cam 13 are related technologies, and their structures will not be repeated here.

Optionally, the transfer case assembly 1 further includes a driving sprocket 18 fixedly sleeved on the output shaft 12 , and the driving sprocket 18 is connected to the driven friction plate assembly 172 . Exemplarily, the driving sprocket 18 is keyed to the driven friction plate assembly 172 , and when the wet clutch 17 is engaged, the driving sprocket 18 generates power transmission between the wet clutch 17 and the output shaft 12 .

Optionally, the wet clutch 17 further includes a spring 173 disposed between the driving friction plate assembly 171 and the driven friction plate assembly 172 , and the spring 173 can drive the driving friction plate assembly 171 and the driven friction plate assembly 172 to separate. Therefore, when the motor drives the worm 16 to reversely rotate, under the action of the spring 173 , the active friction plate assembly 171 drives the worm gear 15 and the active ball cam 14 to move to a position close to the driven ball cam 13 .

The clutch axial pressure calibration device 2 of the transfer case assembly can be installed on the output shaft 12 instead of the driving sprocket 18, and the coupling structure of the clutch axial pressure calibration device 2 of the transfer case assembly 172 with the driven friction plate assembly 172 and the output shaft 12 It is the same as the matching structure of the driving sprocket 18 , the driven friction plate assembly 172 and the output shaft 12 . Therefore, when performing pressure calibration on the wet clutch 17, the driving sprocket 18 can be directly replaced by the clutch axial pressure calibration device 2 of the transfer case assembly. The position signal (equivalent to the rotation angle of the motor) is used to calibrate the transfer case assembly 1.

Please refer to FIGS. 2 to 6 , the clutch axial pressure calibration device 2 of the transfer case assembly includes a force-bearing pillar 21 , a base 22 and a plurality of strain gauges. Wherein, the force-bearing pillar 21 is rotatably sleeved on the output shaft 12 and the force-bearing pillar 21 is located on the side of the driven friction plate assembly 172 away from the turbine 15, and the force-bearing pillar 21 can be aligned with the driven friction plate assembly 172 along the axis of the output shaft 12. abut against, and the driven friction plate assembly 172 is in transmission connection with the stressed pillar 21 . Exemplarily, the stressed strut 21 and the driven friction plate assembly 172 are connected by splines, and the two abut along the axial direction of the output shaft 12 , so that the stressed strut 21 can directly bear the axial force exerted by the driven friction plate assembly 172 And can rotate synchronously. The base 22 is rotatably sleeved on the output shaft 12, and the base 22 can be fixed relative to the output shaft 12 in the axial direction of the output shaft 12. The moving friction plate assemblies 172 are respectively located on both sides of the force bearing pillar 21 . A plurality of strain gauges are evenly distributed along the circumferential direction of the stressed pillar 21 , and the strain gauges are arranged along the radial direction of the stressed pillar 21 . Since the position of the base 22 is fixed, when the wet clutch 17 is engaged, the axial force of the wet clutch 17 is transmitted to the base 22 through the stressed support 21 . The transfer case assembly clutch axial pressure calibration device 2 provided in this embodiment measures the strain force through a plurality of strain gauges, analyzes the axial force on the wet clutch 17, and then measures the pressure of the transfer case assembly by detecting the position of the motor. 1 Calibration can ensure the accuracy of the results, high reliability and practicability. Wherein, the strain gauge can be selected as a uniaxial strain gauge.

Optionally, the force receiving pillar 21 includes a first force receiving body 211 abutting against the driven friction plate assembly 172, a second force receiving body 212 abutting against the base 22, and a connecting body 213, the first force receiving body 211 and the second force receiving body 213 The two force receiving bodies 212 are disposed along the axial direction of the output shaft 12, the outer diameter of the first force receiving body 211 is smaller than the inner diameter of the second force receiving body 212, and the two ends of the connecting body 213 along the radial direction of the output shaft 12 are respectively connected to the second A force-receiving body 211 , a second force-receiving body 212 , and a plurality of strain gauges are all disposed on the connecting body 213 . In this embodiment, both the first force-receiving body 211 and the second force-receiving body 212 of the force-receiving pillar 21 are circular, and the connecting body 213 is connected between them. When the first force receiving body 211 receives the axial force transmitted from the driven friction plate assembly 172, the first force receiving body 211 transmits the force to the second force receiving body 212 through the connecting body 213, and the second force receiving body 212 Pass to base 22. Since the strain gauge is arranged on the connecting body 213 in this embodiment, the rigidity of the first force-receiving body 211 should be strong enough to avoid inaccurate test results caused by deformation of the first force-receiving body 211 . Exemplarily, it can be calculated by CAE (Computer Aided Engineering, computer-aided engineering). Wherein, driven by the motor, the maximum external force that the driven friction plate assembly 172 can exert on the first force receiving body 211 causes the compressive deformation of the first force receiving body 211 to be no more than 0.001 mm. Optionally, the deformation of the second force receiving body 212 and the base 22 under the external force is also controlled within 0.001mm, which can ensure the accuracy of the test results.

Optionally, the connecting body 213 has a first test area 2131 with a thickness of L1 and a second test area 2132 with a thickness of L2, a part of the strain gauges is set in the first test area 2131, and another part of the strain gauges is set in the second test area 2132 , L1 is not equal to L2. In this embodiment, the solution of L1=1mm and L2=3mm is exemplarily given. In other embodiments, the values of L1 and L2 can also be set as required. By setting test areas with different thicknesses, it is convenient to test the rated axial force and overload axial force of the wet clutch 17 . Wherein, the rated axial force is the maximum axial force allowed by the normal use of the wet clutch 17, and the overloaded axial force is greater than the rated axial force. In order to ensure accurate test results, various parameters of the first test area 2131 and the second test area 2132 of the connecting body 213 can be designed through CAE. The first test area 2131 can meet the requirement of having a large amount of deformation under the rated axial force without plastic deformation. Exemplarily, this embodiment exemplarily gives a scheme that the number of the first test area 2131 is two, and the number of the second test area 2132 is two. Wherein, the quantity of strain gauge is four, and four strain gauges are respectively the first strain gauge, the second strain gauge, the third strain gauge and the fourth strain gauge, and the first strain gauge 231 and the second strain gauge 232 are set respectively In the two first test areas 2131 , the third strain gauge 233 and the fourth strain gauge 234 are respectively arranged in the two second test areas 2132 . Optionally, the connecting body 213 includes four connecting pieces, the two ends of the four connecting pieces are respectively connected to the first force receiving body 211 and the second force receiving body 212, the four connecting pieces are arranged at intervals from each other, and the four connecting pieces Two of them have a thickness of L1 and form two first test areas 2131 , and the other two of the four connecting pieces have a thickness of L2 and form two second test areas 2132 . In this way, it can be ensured that the first test area 2131 and the second test area 2132 do not affect each other. Optionally, the surfaces of the plurality of strain gauges are all coated with protective glue to protect the strain gauges.

Optionally, the clutch axial pressure calibration device 2 of the transfer case assembly also includes a first quartz glass plate 241 and a second quartz glass plate 242, the first strain gauge 231 is arranged on one of the first quartz glass plates 241, and the first The quartz glass piece 241 is arranged in the corresponding first testing area 2131 ; the third strain gauge 233 is arranged in the second quartz glass piece 242 , and the second quartz glass piece 242 is arranged in the corresponding second testing area 2132 . By setting the first quartz glass plate 241 and the second quartz glass plate 242 , temperature compensation can be performed on the first strain gauge 231 and the third strain gauge 233 disposed thereon.

Optionally, the first strain gauge 231 and the fourth strain gauge 234 are connected by wires to form an adjacent Wheatstone bridge; the second strain gauge 232 and the third strain gauge 233 are connected by wires to form an adjacent Wheatstone bridge. Tonbridge Road. Adjacent Bridge Wheatstone Bridge Road, also known as Wheatstone Bridge, Wheatstone Bridge or Wheatstone Bridge, is a related technology. The adjacent bridge Wheatstone Bridge formed by the first strain gauge 231 and the fourth strain gauge 234 Take the road as an example for a brief description. The wires include a first wire 31, a second wire 32, a third wire 33 and a fourth wire 34. Please refer to FIG. The wire 32 is connected to the first strain gauge 231, the third wire 33 is connected to the fourth strain gauge 234, the fourth wire 34 is connected to the first wire 31, and the second wire 32, the third wire 33 and the fourth wire 34 are all connected to Junction box 35, and access to data acquisition instrument 36 through junction box 35. Wherein, the second wire 32, the third wire 33 and the fourth wire 34 can be drawn to the junction box 35 through the position of the output shaft 12, and the first wire 31, the second wire 32, the third wire 33 and the fourth wire 34 can pass through the resistance High temperature AB glue fixed.

This embodiment also provides a method for calibrating the clutch axial pressure calibrating device 2 of the transfer case assembly, which is implemented by the above-mentioned calibrating device 2 for the clutch axial pressure of the transfer case assembly.

Exemplarily, the calibration method of the clutch axial pressure calibration device 2 of the transfer case assembly includes the following steps.

S1: provide four strain gauges, two quartz glass plates, a force-bearing pillar 21 and a base 22, the four strain gauges include a first strain gauge 231, a second strain gauge 232, a third strain gauge 233 and a fourth strain gauge 234 , the two quartz glass sheets are respectively the first quartz glass sheet 241 and the second quartz glass sheet 242, the first quartz glass sheet 241 and the second quartz glass sheet 242 are respectively arranged on the supporting pillar 21, and the four strain gauges are placed along the The circumferential direction of the force-bearing pillar 21 is evenly arranged on the force-bearing pillar 21, and the first strain gauge 231 and the second strain gauge 232 are installed on the force-bearing pillar 21. The thickness of the force-bearing pillar 21 is L1, that is, the first strain gauge 231 and the second strain gauge 232 are installed in the first test area 2131; the third strain gauge 233 and the fourth strain gauge 234 are installed in the position of the stressed pillar 21, and the thickness of the stressed pillar 21 is L2, that is, the third strain gauge 233 and the fourth strain gauge 234 are installed in the second test area 2132, and L1 is not equal to L2. And the first quartz glass sheet 241 is arranged between the first strain gauge 231 and the stressed pillar 21, and the second quartz glass sheet 242 is arranged between the third strain gauge 233 and the stressed pillar 21; the first strain gauge 231 and the The fourth strain gauge 234 is connected by wires and forms an adjacent bridge Wheatstone bridge road, the second strain gauge 232 and the third strain gauge 233 are connected by wires and forms an adjacent bridge Wheatstone bridge road, respectively in the first strain gauge The surfaces of the gauge 231 , the second strain gauge 232 , the third strain gauge 233 and the fourth strain gauge 234 are coated with protective glue to fix multiple wires.

A transfer case assembly 1 is provided, and the transfer case assembly 1 further includes a driving sprocket 18 fixedly arranged on the output shaft 12 , and the driving sprocket 18 is connected with a driven friction plate assembly 172 .

Use the transfer case assembly clutch axial pressure calibration device 2 to replace the drive sprocket 18; disassemble the drive sprocket 18, and install the assembled transfer case assembly clutch axial pressure calibration device 2 on the output shaft 12, and receive The force support 21 is connected to the driven friction plate assembly 172 and abuts against the output shaft 12 in the axial direction, the base 22 abuts against the force receiving support 21 along the axial direction of the output shaft 12 and the base 22 is rotatably arranged on the output shaft 12, the base 22 and The relative position of the output shaft 12 in the axial direction of the output shaft 12 is kept stable.

Connect the wires of two adjacent Wheatstone bridges to the data acquisition instrument 36, and connect the angle sensor 38 installed on the motor and used to detect the rotation angle of the motor to the data acquisition instrument 36.

Perform a calibration test. During the calibration test, the controller 37 obtains the rotation angle of the motor through the angle sensor 38, and obtains the strain force borne by the wet clutch 17 at the corresponding motor rotation angle through a plurality of strain gauges, and converts the strain force into The axial force received by the wet clutch 17 is used to calibrate the accuracy of the transfer case assembly 1 .

Claims

A clutch axial pressure calibration device for a transfer case assembly, which is applied to a transfer case assembly (1), and the transfer case assembly (1) includes a casing (11), an output shaft (12), a driven ball Cam (13), driving ball cam (14), worm gear (15), worm (16), motor, driving friction plate assembly (171) and driven friction plate assembly (172), the output shaft (12) is set in rotation The housing (11), the driven ball cam (13), the driving ball cam (14), the worm wheel (15), the driving friction plate assembly (171) and the driven friction plate assembly ( 172) are sequentially sleeved on the output shaft (12) along the axial direction of the output shaft (12), the driven ball cam (13) is fixedly connected to the output shaft (12), and the driving ball cam (14), the turbine (15) and the active friction plate assembly (171) are all in sliding fit with the output shaft (12), and the turbine (15) and the active friction plate assembly (171) are rotationally connected And the turbine wheel (15) and the active friction plate assembly (171) abut along the axial direction of the output shaft (12), and the active friction plate assembly (171) is keyed to the output shaft (12) , the motor is in transmission connection with the worm (16), the worm (16) is meshed with the worm (15), and the worm (15) can drive the active ball cam (14) to rotate, so that the The driving ball cam (14) moves along the axial direction of the output shaft (12) relative to the driven ball cam (13), and the driving ball cam (14) can drive the turbine (15) and the The active friction plate assembly (171) moves synchronously along the axial direction of the output shaft (12); the clutch axial pressure calibration device of the transfer case assembly includes:

The force bearing strut (21) is rotatably sleeved on the output shaft (12) and the force bearing strut (21) is located on the side of the driven friction plate assembly (172) away from the turbine (15), The stressed pillar (21) can abut against the driven friction plate assembly (172) along the axial direction of the output shaft (12), and the driven friction plate assembly (172) and the stressed pillar ( 21) Transmission connection;

The base (22) is rotatably sleeved on the output shaft (12), and the base (22) can be aligned with the output shaft (12) in the axial direction of the output shaft (12) The relative position is fixed, the base (22) abuts against the force-bearing pillar (21), and the base (22) and the driven friction plate assembly (172) are respectively located on both sides of the force-bearing pillar (21). side;

A plurality of strain gauges, the plurality of strain gauges are evenly distributed along the circumferential direction of the stressed support (21), and each strain gauge is arranged along the radial direction of the stressed support (21).
The clutch axial pressure calibration device of the transfer case assembly according to claim 1, wherein the stressed support (21) includes a first stressed body (211) abutting against the driven friction plate assembly (172) ), and the base (22) abuts against the second force receiving body (212), and the connecting body (213), the first force receiving body (211) and the second force receiving body (212) along the The axial misalignment of the output shaft (12), the outer diameter of the first force-receiving body (211) is smaller than the inner diameter of the second force-receiving body (212), and the connecting body (213) is along the output The radial ends of the shaft (12) are respectively connected to the first force receiving body (211) and the second force receiving body (212), and a plurality of the strain gauges are all arranged on the connecting body (213) .
The clutch axial pressure calibration device for transfer case assembly according to claim 2, wherein the connecting body (213) has a first test area (2131) with a thickness of L1 and a second test area (2131) with a thickness of L2 ( 2132), a part of the plurality of strain gauges is set in the first test area (2131), and another part of the plurality of strain gauges is set in the second test area (2132), L1 is not equal to L2.
The clutch axial pressure calibration device of the transfer case assembly according to claim 3, wherein L1=1mm, L2=3mm.
The clutch axial pressure calibration device of the transfer case assembly according to claim 3, wherein the number of the first test area (2131) is two, and the number of the second test area (2132) is two , the number of the strain gauges is four, and the four strain gauges are respectively the first strain gauge (231), the second strain gauge (232), the third strain gauge (233) and the fourth strain gauge (234 ), the first strain gauge (231) and the second strain gauge (232) are respectively arranged in the two first test areas (2131), the third strain gauge (233) and the fourth Strain gauges (234) are respectively arranged in the two second test areas (2132).
The clutch axial pressure calibration device of the transfer case assembly according to claim 5, further comprising a first quartz glass plate (241) and a second quartz glass plate (242), the first strain gauge (231) is arranged on One said first quartz glass piece (241), and said first quartz glass piece (241) is arranged in said first test area (2131) corresponding; Said third strain gauge (233) is arranged in said A second quartz glass piece (242), and the second quartz glass piece (242) is arranged in the corresponding second test area (2132).
The clutch axial pressure calibration device of the transfer case assembly according to claim 6, wherein the first strain gauge (231) and the fourth strain gauge (234) are connected by wires to form an adjacent bridge Wheat Wheatstone bridge road; the second strain gauge (232) and the third strain gauge (233) are connected by wires to form an adjacent bridge Wheatstone bridge road.
The clutch axial pressure calibration device of the transfer case assembly according to claim 2, wherein, along the axial direction of the output shaft (12), the first force receiving body (211) bears the driven friction plate assembly (172) The amount of deformation of the force is less than 0.001mm.
The clutch axial pressure calibration device of the transfer case assembly according to any one of claims 1-8, wherein the surfaces of the plurality of strain gauges are all coated with protective glue.
A calibration method for the clutch axial pressure calibration device of the transfer case assembly according to any one of claims 1-9, comprising:

Provide four strain gauges, two quartz glass sheets, a force-bearing pillar (21) and a base (22), and the four strain gauges include a first strain gauge (231), a second strain gauge (232), a third strain gauge meter (233) and the fourth strain gauge (234), the two quartz glass sheets are respectively the first quartz glass sheet (241) and the second quartz glass sheet (242), and the first quartz glass sheet (241 ) and the second quartz glass sheet (242) are arranged on the stressed pillar (21) respectively, and the four strain gauges are evenly arranged on the stressed pillar (21) along the circumferential direction of the stressed pillar (21). The pillar (21), the first strain gauge (231) and the second strain gauge (232) are installed in the position of the stressed pillar (21) corresponding to the thickness of the stressed pillar (21) is L1 , the third strain gauge (233) and the fourth strain gauge (234) are installed in the position of the stressed pillar (21) corresponding to the thickness of the stressed pillar (21) is L2, L1 is not equal to L2, and a first quartz glass sheet (241) is arranged between the first strain gauge (231) and the stressed pillar (21), and the third strain gauge (233) and the stressed pillar (21) A second quartz glass sheet (242) is arranged between them; the first strain gauge (231) and the fourth strain gauge (234) are connected by wires to form an adjacent Wheatstone bridge, and the The second strain gauge (232) and the third strain gauge (233) are connected by wires and form an adjacent bridge Wheatstone bridge road, respectively in the first strain gauge (231), the second strain gauge ( 232), the surfaces of the third strain gauge (233) and the fourth strain gauge (234) are coated with protective glue, and a plurality of wires are fixed;

The transfer case assembly (1) according to any one of claims 1-9 is provided, the transfer case assembly (1) also includes a drive sprocket (18) fixedly arranged on the output shaft (12), said The driving sprocket (18) is sleeved on the output shaft (12) and connected with the driven friction plate assembly (172);

The drive sprocket (18) is replaced by the transfer case assembly clutch axial pressure calibration device; the drive sprocket (18) is disassembled, and the assembled transfer case assembly clutch is axially The pressure calibration device is installed on the output shaft (12), the force bearing support (21) is connected with the driven friction plate assembly (172) and abuts along the axial direction of the output shaft (12), and the base (22) abuts against the stressed support (21) along the axial direction of the output shaft (12) and the base (22) is rotatably arranged on the output shaft (12), the base (22) and The relative position of the output shaft (12) along the axial direction of the output shaft (12) remains stable;

The wires of two adjacent bridges Whiston Bridge Road are respectively connected to the data acquisition instrument (36), and the angle sensor (38) that is installed in the motor and is used to detect the rotation angle of the motor is connected to the data acquisition instrument (36);

Perform a calibration test.