A kind of automobile steering wheel wire harness fatigue resistance performance testing device

Abstract

The application provides a kind of automobile steering wheel wire harness fatigue resistance performance testing device, it is related to automobile wire harness detection technical field, including: base, the base top is fixedly connected with test rack, the test rack top is equipped with inner rotary seat, the bottom of the inner rotary seat is vertically fixedly connected with rotary seat bidirectional rotary shaft, the rotary seat bidirectional rotary shaft is rotatably connected test rack by bearing;The winding state of the hairline wire harness is similar to the state in actual layout, can better reflect the bending angle of hairline in normal use, and the friction generated when hairline moves, makes the test environment more real, improves the accuracy of test results, solves the problem that the traditional detection mode cannot better simulate the actual bending angle of wire harness during vehicle driving, the friction degree and the influence of the elasticity of wire body winding state on the fatigue resistance of wire harness, and the conduction performance of wire harness cannot be directly judged by the outer surface of wire harness.

Description

Technical Field

[0001] This invention relates to the field of automotive wiring harness testing technology, and in particular to a device for testing the fatigue resistance of automotive steering wheel wiring harnesses. Background Technology

[0002] The wiring harness in a steering wheel is commonly referred to as a "swivel spring," also known as an airbag swivel spring. Its core function is to connect electrical components such as the main airbag, horn, and multifunction buttons on the steering wheel to the vehicle body's fixed wiring harness, ensuring that the internal wiring is not twisted or pulled apart when the steering wheel rotates at any angle. The swivel spring uses a flexible, flat cable coil design, which can be repeatedly wound, unwound, or tightened as the steering wheel rotates, leaving about half a turn of slack to prevent the cable from breaking when the steering wheel is turned to its full lock. To meet the requirements of lightweight improvements in automotive parts, this type of wiring harness needs to be developed and manufactured using new lightweight materials. Because the swivel spring is frequently bent and straightened as the steering wheel turns or returns to center during driving, it will significantly accelerate fatigue damage compared to traditional wiring harnesses. Therefore, fatigue resistance testing is an important part of the development process of steering wheel swivel spring wiring harnesses.

[0003] In the traditional fatigue testing of automotive steering wheel clock spring harnesses, bending test machines are often used to repeatedly bend the harness and observe the maximum number of bends it can withstand to determine its fatigue resistance. However, traditional testing methods cannot better simulate the actual bending angle, friction, and elasticity of the harness in its coiled state during vehicle driving, and the conductivity of the harness cannot be directly judged from its appearance. Summary of the Invention

[0004] This invention provides a fatigue resistance testing device for automotive steering wheel wiring harnesses. This addresses the problem that traditional fatigue testing of automotive steering wheel clock spring wiring harnesses often involves repeatedly bending the harness using a bending test machine and observing the maximum number of bends it can withstand to determine its fatigue resistance. However, traditional testing methods cannot effectively mimic the actual bending angles, friction levels, and elasticity of the wiring harness during vehicle driving, and the conductivity of the harness cannot be directly assessed from its appearance.

[0005] This invention provides a fatigue resistance testing device for automotive steering wheel wiring harnesses, specifically comprising: a base, a test bench fixedly connected above the base, an inner rotating seat above the test bench, a bidirectional rotating shaft vertically fixedly connected to the bottom of the inner rotating seat, the bidirectional rotating shaft being rotatably connected to the test bench via bearings, a circular outer enclosure fixedly connected above the test bench, the outer enclosure having openings in its sidewalls, the inner rotating seat located inside the outer enclosure, a first driven rotating wheel and a second driven rotating wheel mounted on the bidirectional rotating shaft via an interference fit, a test drive component fixedly connected above the base, and an active rotating cone fixedly connected to the test drive component's rotating shaft, the active rotating cone being externally connected to the test drive component. The test bench features a partial toothed pattern, the length of which is three-eighths of the outer circumference of the active rotating cone. A wiring harness shorting connector is fixedly connected to the top of the inner rotating seat, with two shorting ports for internal electrical shorting. An inner enclosure is fixedly connected to the upper surface of the inner rotating seat, and two steering wheel hairspring wiring harnesses of the test type are wound within the gap between the inner wall of the outer enclosure and the outer wall of the inner enclosure. A enclosure through-hole is provided through the side wall of the inner enclosure. An end connector is fixedly connected to the top of the test bench, with two end electrical ports inside. A continuity indicator light is provided on the outer surface of the end connector. A control panel is fixedly connected to the outside of the test bench, and the control panel is connected to the test drive unit via an electrical connection wire.

[0006] Furthermore, two inner sliding grooves are provided on the inner wall of the inner enclosure. The inner sliding grooves are perpendicular to the upper surface of the inner rotating seat, and a spiral sleeve is vertically welded to the center of the inner rotating seat.

[0007] Furthermore, a cylindrical positioning end cap is slidably connected inside the inner enclosure, and a positioning end cap positioning stud is rotatably connected to the center of the positioning end cap.

[0008] Furthermore, the lower end of the end cap positioning stud is helically connected to a helical sleeve, and two outer guide rods are fixedly connected to the outer surface of the positioning end cap, with the two outer guide rods slidably connected to two inner sliding grooves respectively.

[0009] Furthermore, the side wall of the positioning end cap is provided with a wire harness clamping groove, the lower end of which has a "V" shaped opening, and the wire harness clamping groove coincides with the enclosure opening.

[0010] Furthermore, an auxiliary limiting cap is rotatably connected to the outside of the positioning end cap, and four limiting screws are rotatably connected to the bottom of the auxiliary limiting cap.

[0011] Furthermore, the auxiliary limiting cap is made of transparent acrylic material, and the outer casing is made of transparent acrylic material.

[0012] Furthermore, when the two electrical connectors at the ends are respectively connected to the ends of the two steering wheel clock springs, the two clock springs, the wiring harness shorting socket, the two electrical connectors at the ends, and the on / off status indicator lights are connected in series to the output power supply of the control panel.

[0013] Furthermore, both the first driven wheel and the second driven wheel are bevel gears, with the cone end of the first driven wheel facing downwards and the cone end of the second driven wheel facing upwards.

[0014] Furthermore, the tooth surfaces of both the first driven wheel and the second driven wheel are in contact with the conical surface of the active rotating conical disk.

[0015] This invention provides a device for testing the fatigue resistance of automotive steering wheel wiring harnesses, which has the following advantages: The fatigue resistance testing device of this invention is used for fatigue resistance testing of automotive steering wheel hairspring harnesses. Two hairspring harnesses are installed on the test bench and inner rotating seat, allowing the hairspring harnesses to be naturally wound between the outer and inner enclosures. The winding state of the hairspring harnesses is kept similar to that in actual installation, which can better reflect the bending angle of the hairspring during normal use and the friction generated during hairspring movement, making the test environment more realistic and improving the accuracy of the test results.

[0016] Furthermore, the transmission structure was improved. The test drive component provides rotational power during testing, and the torque is transmitted to the inner rotating seat through the active rotating cone and the bidirectional rotating shaft of the rotating seat, causing the inner rotating seat to rotate to simulate the rotation of a steering wheel. At the same time, the transmission structure between the active rotating cone and the bidirectional rotating shaft of the rotating seat was improved. When the partial tooth pattern is engaged with the first driven wheel, it drives the bidirectional rotating shaft of the rotating seat to rotate. When the partial tooth pattern disengages from the first driven wheel, the active rotating cone and the bidirectional rotating shaft of the rotating seat lose connection. As the active rotating cone continues to rotate, the partial tooth pattern engages with the second driven wheel, causing the bidirectional rotating shaft of the rotating seat to rotate in the opposite direction. This achieves bidirectional repetitive rotational drive of the inner rotating seat, which can simulate the turning or straightening action of a driver's steering wheel during driving a car. By adjusting the speed of the test drive component, the speed and frequency of the reciprocating rotation of the inner rotating seat can be increased, the total test time can be reduced, and the overall R&D progress can be improved.

[0017] In addition, during the test, the hairspring harness is located inside the outer sheath. The wear, fatigue detachment, and fatigue cracking of the outer surface of the hairspring harness can be directly observed through the transparent outer sheath and auxiliary limiting cap. At the same time, the two ends of the hairspring harness inside the inner sheath are connected in series through the harness shorting socket. The outer end of the hairspring harness is connected to the electrical connectors at both ends. The electrical connectors at both ends and the continuity indicator light are connected in series and connected to the power supply of the control panel through the electrical connection wire. Under normal conditions, the two hairsprings, the harness shorting socket, the electrical connectors at both ends, the continuity indicator light, and the output power supply of the control panel are in series. The continuity indicator light is on, indicating that the wiring harness has good conductivity. When the conductor inside the wiring harness breaks due to fatigue damage, the circuit is broken, and the continuity indicator light goes out, thus more directly showing the conductivity of the wiring harness during the fatigue resistance test. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0019] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0020] In the attached diagram: Figure 1 A schematic diagram of the overall structure of this application is shown; Figure 2 A schematic diagram of the internal structure of this application is shown; Figure 3 This diagram shows the structure of the positioning end cap and the inner rotating seat when they are separated. Figure 4 This application shows Figure 3 A structural diagram from the bottom view; Figure 5 This paper shows a schematic diagram of the structure in its disassembled state. Figure 6 This application shows Figure 5 A structural diagram from the bottom view; Figure 7 A schematic diagram of the structure of the bidirectional rotating shaft of this application is shown; Figure 8 A schematic diagram of the internal enclosure structure of this application is shown; Figure 9 A schematic diagram of the wire harness clamping groove of this application is shown; Figure 10 A circuit diagram of the terminal connector portion of this application is shown; Figure 11 This application shows Figure 3 A magnified structural diagram of point A in the middle.

[0021] Figure label: 1. Base; 2. Test bench; 201. Outer enclosure; 3. Inner rotating seat; 301. Rotating seat bidirectional rotating shaft; 302. First driven rotating wheel; 303. Second driven rotating wheel; 304. Inner enclosure; 305. Enclosure through-hole; 306. Inner sliding groove; 307. Spiral sleeve; 4. Wire harness shorting connector; 401. Shorting connector socket; 5. Positioning end cap; 501. End cap positioning stud; 502. Wire harness clamping groove; 503. Auxiliary limiting rotating cap; 504. Limiting rotating stud; 505. Outer guide rod; 6. Test drive component; 7. Active rotating cone; 701. Partial toothed pattern; 8. End connector; 801. End electrical socket; 802. Conductivity indicator light; 9. Control panel. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1: Please refer to Figures 1 to 11 : This invention proposes a fatigue resistance testing device for automotive steering wheel wiring harnesses, comprising: a base 1, a test bench 2 fixedly connected above the base 1, an inner rotating seat 3 above the test bench 2, a bidirectional rotating shaft 301 vertically fixedly connected to the bottom of the inner rotating seat 3, the bidirectional rotating shaft 301 being rotatably connected to the test bench 2 via bearings, a circular outer casing 201 fixedly connected above the test bench 2, the outer casing 201 having openings in its sidewalls, the inner rotating seat 3 located inside the outer casing 201, the bidirectional rotating shaft 301 having a first driven rotating wheel 302 and a second driven rotating wheel 303 mounted on it via an interference fit, a test drive component 6 fixedly connected above the base 1, an active rotating cone 7 fixedly connected to the shaft of the test drive component 6, the active rotating cone 7 having partial teeth 701 on its outer surface, the length of the partial teeth 701 being three-eighths of the outer circumference length of the active rotating cone 7, and a short wiring harness fixedly connected to the top of the inner rotating seat 3. The connector 4, a wire harness shorting connector 4, has two shorting ports 401, which are electrically shorted internally. An inner enclosure 304 is fixedly connected to the upper surface of the inner rotating seat 3. Two steering wheel hairspring wire harnesses under test are wound in the gap between the inner wall of the outer enclosure 201 and the outer wall of the inner enclosure 304. An enclosure through-hole 305 is provided through the side wall of the inner enclosure 304. An end connector 8 is fixedly connected to the top of the test bench 2. The end connector 8 has two end electrical ports 801. The outer surface of the end connector 8 is provided with a conduction status indicator light 802. The test bench 2 is fixedly connected to a control panel 9. The control panel 9 is connected to the test drive component 6 through an electrical connection wire. The first driven wheel 302 and the second driven wheel 303 are both bevel gears. The cone end of the first driven wheel 302 faces downward and the cone end of the second driven wheel 303 faces upward. The tooth surfaces of the first driven wheel 302 and the second driven wheel 303 are in contact with the cone surface of the driving rotating cone disk 7.Two spiral wire harnesses are naturally wound and positioned between the outer sheath 201 and the inner sheath 304. One end of each wire harness located inside the inner sheath 304 is inserted into the shorting socket 401. The two wire harnesses are connected in series via the wire harness shorting bracket 4. The outer ends of the two spiral wire harnesses are connected to the two end electrical sockets 801. During the test, the test drive unit 6 is activated via the control panel 9, driving the active rotating cone 7 to rotate. When the partial toothed groove 701 is engaged with the first driven wheel 302, the bidirectional rotating shaft 301 of the rotating seat is driven to rotate. When the partial toothed groove 701 disengages from the first driven wheel 302, the active rotating cone 7 loses connection with the bidirectional rotating shaft 301 of the rotating seat. The continuous rotation of the conical disc 7 engages the localized toothed groove 701 with the second driven wheel 303, driving the bidirectional rotating shaft 301 of the inner rotating seat to rotate in the opposite direction to the previous rotation. This achieves bidirectional repetitive rotation drive for the inner rotating seat 3, simulating the steering wheel turning or straightening actions of a driver while driving a car. By adjusting the rotation speed of the test drive component 6, the speed and frequency of the reciprocating rotation of the inner rotating seat 3 can be increased, compressing the total test time. This test method maintains the winding state of the hairspring harness similar to that in actual installation, better reflecting the bending angle of the hairspring during normal use and the friction generated during hairspring movement, making the test environment more realistic and the test results more accurate.

[0024] In this embodiment, two inner sliding grooves 306 are provided on the inner wall of the inner enclosure 304. The inner sliding grooves 306 are perpendicular to the upper surface of the inner rotating seat 3. Two outer guide rods 505 are fixedly connected to the outer surface of the positioning end cover 5. The two outer guide rods 505 are slidably connected to the two inner sliding grooves 306 respectively, which play a guiding role, so that the positioning end cover 5 rotates with the inner rotating seat 3.

[0025] In this embodiment, a cylindrical positioning end cap 5 is slidably connected inside the inner enclosure 304. An end cap positioning stud 501 is rotatably connected to the center of the positioning end cap 5. A spiral sleeve 307 is vertically welded to the center of the inner rotating seat 3. The lower stud portion of the end cap positioning stud 501 is spirally connected to the spiral sleeve 307. The positioning end cap 5 is fixedly installed by the cooperation between the end cap positioning stud 501 and the spiral sleeve 307.

[0026] In this embodiment, the side wall of the positioning end cap 5 is provided with a wire harness clamping groove 502. The lower end of the wire harness clamping groove 502 has a "V" shaped opening and coincides with the enclosure through-hole 305. The wire harness passing through the enclosure through-hole 305 is further clamped by the outer guide rod 505 to assist in positioning the wire harness. The "V" shaped wire harness clamping groove 502 can more quickly fit the wire harness and avoid the wire harness from becoming tangled.

[0027] In this embodiment, an auxiliary limiting cap 503 is rotatably connected to the outside of the positioning end cap 5. Four limiting pins 504 are rotatably connected to the bottom of the auxiliary limiting cap 503. The limiting pins 504 limit the arc-shaped bending part of the hairspring harness to avoid greater damage caused by excessive bending of the harness. During the rotation of the harness, the limiting pins 504 and the auxiliary limiting cap 503 follow each other to protect the harness and prevent the harness from detaching from the outer sheath 201.

[0028] In this embodiment, the auxiliary limiting cap 503 is made of transparent acrylic material, and the outer sheath 201 is made of transparent acrylic material; the appearance of the hairspring harness can be observed more clearly from the outside, and the wear, fatigue shedding and fatigue cracking of the outer surface of the hairspring harness can be observed.

[0029] In Example 2, based on Example 1, when the two end electrical connectors 801 are respectively connected to the ends of the two steering wheel clock springs, the two clock springs, the wiring harness shorting socket 4, the two end electrical connectors 801, and the conduction status indicator light 802 are connected in series to the output power supply of the control panel 9; one end of the two clock spring wiring harnesses located inside the inner enclosure 304 is connected in series through the wiring harness shorting socket 4, and the outer end of the clock spring wiring harness is connected to the two end electrical connectors 801. The end electrical connectors 801 and the conduction status indicator light 802 are connected in series and electrically. When the wire is connected to the power supply of the control panel 9, under normal conditions, the two hairsprings, the wire harness shorting socket 4, the electrical connectors 801 at both ends, the continuity indicator light 802, and the output power supply of the control panel 9 are connected in series. When the continuity indicator light 802 is lit, it indicates that the wire harness has good conductivity. When the conductor inside the wire harness breaks due to fatigue damage, the circuit is broken, and the continuity indicator light 802 goes out. This allows for a more direct view of the wire harness's conductivity during the fatigue test and a quick determination of whether the conductor inside the wire harness is damaged.

[0030] The working principle of this embodiment is as follows: First, the two spiral spring harnesses are naturally wound and positioned between the outer sheath 201 and the inner sheath 304. One end of each harness located inside the inner sheath 304 is inserted into the shorting socket 401. The two harnesses are connected in series via the harness shorting base 4. The outer ends of the two spiral spring harnesses are connected to the two end electrical sockets 801. The positioning end cap 5 is placed over the inner screw base 3, so that the harness clamping groove 502 is fitted onto the spiral spring passing through the sheath through the sheath through the 305 and fixed to it. The positioning end cap positioning stud 501 is screwed into the spiral sleeve 307 to fix the positioning. When the end cap 5 is locked, the test drive unit 6 is activated via the control panel 9, driving the active rotating cone disk 7 to rotate. When the partial toothed groove 701 is engaged with the first driven wheel 302, it drives the rotating seat bidirectional rotating shaft 301 to rotate. When the partial toothed groove 701 disengages from the first driven wheel 302, the active rotating cone disk 7 loses connection with the rotating seat bidirectional rotating shaft 301. As the active rotating cone disk 7 continues to rotate, the partial toothed groove 701 engages with the second driven wheel 303, causing the rotating seat bidirectional rotating shaft 301 to rotate in the opposite direction to before. The rotation direction enables bidirectional reciprocating rotation drive of the inner rotating seat 3, which can simulate the turning or straightening action of a driver's steering wheel during driving a car. By adjusting the rotation speed of the test drive component 6, the speed and frequency of the reciprocating rotation of the inner rotating seat 3 can be increased, reducing the total test time. Through the transparent auxiliary limiting cover 503 and the outer protection 201, the appearance of the hairspring harness can be more clearly observed from the outside, and the wear, fatigue detachment, and fatigue cracking of the outer surface of the hairspring harness can be observed. Under normal conditions of the tested harness, the two hairsprings and the short harness are... The connector 4, the two end electrical sockets 801, the continuity indicator light 802, and the output power of the control panel 9 are connected in series. When the continuity indicator light 802 is lit, it indicates that the wire harness has good conductivity. When the conductor inside the wire harness breaks due to fatigue damage, the continuity indicator light 802 goes out, indicating that the conductor inside the wire harness is damaged. The rotation speed of the test drive 6 can be adjusted through the control panel 9, thereby adjusting the rotation frequency of the wire harness fatigue resistance test, effectively improving the test efficiency. The fatigue resistance of the wire harness is determined by observing the maximum number of bends it can withstand.

[0031] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0032] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0033] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A fatigue resistance testing device for automotive steering wheel wiring harnesses, comprising: A base (1) is provided with a test stand (2) fixedly connected above the base (1). An inner rotating seat (3) is provided above the test stand (2). The inner rotating seat (3) is characterized by having a rotating seat bidirectional rotating shaft (301) vertically fixedly connected to the bottom of the inner rotating seat (3). The rotating seat bidirectional rotating shaft (301) is rotatably connected to the test stand (2) via a bearing. A circular outer casing (201) is fixedly connected above the test stand (2). The outer casing (201) has a through opening on its side wall. The inner rotating seat (3) is located inside the outer casing (201). The rotating seat bidirectional rotating shaft (301) is fitted with a first driven rotating wheel (302) and a second driven rotating wheel (303) via an interference fit. A test drive component (6) is fixedly connected above the base (1). An active rotating cone disk (7) is fixedly connected to the rotating shaft of the test drive component (6). The active rotating cone disk (7) has a local toothed pattern (701) on its outer side. The length of the tooth pattern (701) is three-eighths of the outer circumference length of the active rotating cone disk (7). A wire harness shorting seat (4) is fixedly connected to the top of the inner rotating seat (3). The wire harness shorting seat (4) is provided with two shorting ports (401). The two shorting ports (401) are electrically shorted inside. An inner enclosure (304) is fixedly connected to the upper surface of the inner rotating seat (3). Two test steering wheel wheels are wound in the gap between the inner wall of the outer enclosure (201) and the outer wall of the inner enclosure (304). The wire bundle has an enclosure opening (305) through the side wall of the inner enclosure (304). The test bench (2) is fixedly connected to the top of the test bench (2). The end connector (8) has two end electrical sockets (801) inside. The outer surface of the end connector (8) is provided with a conduction status indicator light (802). The test bench (2) is fixedly connected to the outside of the test bench (2). The control panel (9) is connected to the test drive unit (6) through an electrical connection line.

2. The fatigue resistance testing device for automotive steering wheel wiring harness according to claim 1, characterized in that, The inner wall of the inner enclosure (304) has two inner grooves (306), which are perpendicular to the upper surface of the inner rotating seat (3). The center of the inner rotating seat (3) is vertically welded with a spiral sleeve (307).

3. The fatigue resistance testing device for automotive steering wheel wiring harness according to claim 1, characterized in that, The inner enclosure (304) is slidably connected to a cylindrical positioning end cap (5), and the center of the positioning end cap (5) is rotatably connected to an end cap positioning stud (501).

4. The fatigue resistance testing device for automotive steering wheel wiring harness according to claim 3, characterized in that, The lower stud portion of the end cap positioning stud (501) is spirally connected to the spiral sleeve (307), and two outer guide rods (505) are fixedly connected to the outer surface of the positioning end cap (5). The two outer guide rods (505) are slidably connected to two inner sliding grooves (306).

5. The fatigue resistance testing device for automotive steering wheel wiring harness according to claim 3, characterized in that, The positioning end cap (5) has a wire harness clamping groove (502) on its side wall. The lower end of the wire harness clamping groove (502) has a "V" shaped opening and the wire harness clamping groove (502) overlaps with the enclosure opening (305).

6. The fatigue resistance testing device for automotive steering wheel wiring harness according to claim 3, characterized in that, The positioning end cap (5) is rotatably connected to an auxiliary limiting cap (503), and the bottom of the auxiliary limiting cap (503) is rotatably connected to four limiting pins (504).

7. The fatigue resistance testing device for automotive steering wheel wiring harness according to claim 6, characterized in that, The auxiliary limiting cap (503) is made of transparent acrylic material, and the outer cover (201) is made of transparent acrylic material.

8. The fatigue resistance testing device for automotive steering wheel wiring harness according to claim 1, characterized in that, When the two electrical connectors (801) are connected to the ends of the two steering wheel hairsprings, the two hairsprings, the wiring harness shorting socket (4), the two electrical connectors (801) and the conduction status indicator (802) are connected in series to the output power of the control panel (9).

9. The fatigue resistance testing device for automotive steering wheel wiring harness according to claim 1, characterized in that, Both the first driven gear (302) and the second driven gear (303) are bevel gears. The cone end of the first driven gear (302) faces downward, and the cone end of the second driven gear (303) faces upward.

10. The fatigue resistance testing device for automotive steering wheel wiring harness according to claim 9, characterized in that, The tooth surfaces of the first driven wheel (302) and the second driven wheel (303) are in contact with the cone surface of the active rotating cone disk (7).

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