Automobile steering gear torsion bar fatigue test detection device and detection method

Abstract

A fatigue test detection device for a torsion bar of an automobile steering device is characterized in that a base is fixed on a T-shaped platform, a torque sensor is fixed on the sensor base through a screw, a chuck screws a clamping jaw into a chuck groove through a rotating annular strip, the chuck is matched with a chuck fixing plate through a screw and a nut, the chuck base is connected, and an input shaft is in clearance fit with a screw. A large screw hole is in clearance fit with the outer circle of the input shaft, a torsion bar is in clearance fit with an inner hole of a screw rod part and an inner hole of the input shaft, a plug is in threaded connection with the tail of the screw rod, a small screw hole locks the input shaft through a positioning pin, the screw rod part is placed in a positioning sleeve, and a rotating groove cover is rotationally locked through threads. The tension and pressure sensor shaft is in clearance fit with the tension and pressure sensor base hole, and the cylinder is fixed on the cylinder base. According to the torsion bar fatigue test detection device and method, fatigue durability can be accurately detected before leaving a factory, and it is ensured that a steering gear can be normally assembled.

Description

Technical Field

[0001] The invention relates to a detection device and a detection method, in particular to a detection device and a detection method for fatigue test of torsion bar of automobile steering gear. Background Art

[0002] The torsion bar fatigue assembly includes input shaft, torsion bar, screw, locating pin and plug. As a very important safety part in the automobile steering system, the sudden break of the steering torsion bar during normal driving of the automobile will lead to steering failure, which will directly cause safety accidents of personnel and automobiles. It is particularly important to do torsion bar fatigue test. However, there is no universal test equipment in the automobile steering system, and the scope of some test inspection standards is limited and cannot meet the requirements, resulting in the lack of such standard solutions (including: axial force load, rotational torque, angle, frequency) test bench. The existing test bench also requires special tooling to lock the torsion bar fatigue assembly, and the tooling cannot be universal. In order to reduce the cost of the upstream and downstream industrial chain of the automobile, it is necessary to perform fatigue testing on the torsion bar of the automobile steering gear before it leaves the factory to meet the safety production requirements.

[0003] There are similar detection devices on the market, but they all have some disadvantages. For example, they require special tooling equipment, are cumbersome to operate, and are costly; they also have problems such as narrow detection range and low accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide a torsion bar fatigue test detection device and detection method which has a simple structure, is easy to use, and can accurately detect fatigue durability before leaving the factory to ensure that the steering gear can be assembled normally.

[0005] The technical solution of the present invention is: A torsion bar fatigue test detection device for an automobile steering gear comprises a T-shaped platform, a torque sensor base, a tension and pressure sensor base, a chuck base, a cylinder base, a torque sensor, a tension and pressure sensor, a chuck, a cylinder, a rotating slot cover, and a positioning sleeve, and is characterized in that: The torque sensor base, chuck base, cylinder base, and tension and pressure sensor base are fixed on the T-type platform with screws respectively. The torque sensor is fixed to the sensor base with screws. The torque sensor rod and the torque sensor clearance are locked with screws, and the clearance with the inner hole of the coupling is connected and locked with small screws. The chuck screws the claws into the chuck groove by rotating the annular bar. The chuck and the chuck fixing plate are matched with screws and nuts to connect the chuck base. The input shaft, torsion bar, plug and screw clearance are matched. The large hole of the screw and the outer circle of the input shaft clearance are matched. The torsion bar The inner hole of the screw rod and the inner hole of the input shaft are matched with each other, the plug is threadedly connected to the tail of the screw, the small hole of the screw is locked with the input shaft, torsion bar and screw through the locating pin, the claw clamps the outer circular end of the input shaft, the screw rod is placed in the locating sleeve, the rotating slot cover is locked by threaded rotation, the external thread at one end of the locating sleeve is connected to the internal thread of the tension pressure sensor, the internal thread of the sensor is threadedly connected to the shaft of the tension pressure sensor, the shaft of the tension pressure sensor is matched with the clearance of the tension pressure sensor base hole, the cylinder is fixed on the cylinder base, and the end face torque of the screw rod is given through the tension pressure sensor.

[0006] The T-shaped platform is in a rectangular shape, with a T-shaped slot on the platform, screws in the slot, and nuts connected with the screws, so that the front and rear distances can be adjusted at will to meet the needs of various lengths of parts.

[0007] The torque sensor base, the tension and pressure sensor base, the chuck base, and the ends of the cylinder base are threadedly connected with the base through fixing screws and nuts.

[0008] One end of the torque sensor is fixed on the torque sensor base by a screw thread, and the inner hole of the other end is connected to the torque sensor connecting rod by clearance fit.

[0009] The tension and pressure sensor is threadedly connected to the internal thread of the tension and pressure sensor by the positioning sleeve rod, the internal thread of the sensor is threadedly connected to the cylinder shaft rod, the cylinder shaft is matched through the clearance of the tension and pressure sensor base hole, and the cylinder is fixed to the cylinder base with screws and threads.

[0010] The chuck is screwed into the chuck groove by rotating the annular bar, and the circumference of the chuck is adjusted by rotating the handle counterclockwise or clockwise. The chuck and the chuck fixing plate are connected with screws and nuts and connected to the chuck base.

[0011] The cylinder is provided with a cylinder threadedly connected to a cylinder base through a screw, and an axial load torque is applied to the end face of the screw rod through a tension pressure sensor.

[0012] The rotating slot cover is connected with the positioning sleeve thread.

[0013] A method for fatigue testing a torsion bar of a vehicle steering gear, characterized in that: a rotating slot cover and a positioning sleeve are used to fix the screw rod, and the claws are used to adjust the fixed input shaft by rotating the handle, and the rotational torque and angle are loaded at a frequency in the range of 1-20HZ, so that the angle curve reaches a range of plus or minus 1-30°, and the torque is a rotational torque in the range of 1-100N.m. The axial force of the tension and pressure sensor applies an axial load in the range of 1-10KN, and 1 million cycles are completed. After the test is completed, the torsion bar has no defects such as cracks.

[0014] The beneficial effects of the present invention are: 1. The automobile steering gear torsion bar fatigue test detection device fully meets the needs of no test bench, the test standard also meets the standard, the test tooling is universal, and the detection device can be adjusted to make it suitable for different types of steering gear torsion bars, effectively expanding its scope of application, improving universality, reducing tooling costs and test costs, and solving the problem of no test bench demand and high outsourcing costs. 2. The T-slot platform can meet the requirements of front-to-back, left-to-right, and angle installation, and is suitable for testing products of various complex sizes. 3. The clamping chuck of the present invention can meet the clamping methods of torsion bar fatigue assemblies of various models and sizes or other shaft parts, and does not need to design a separate tooling for locking the input shaft end, saving costs. 4. The device of the present invention can meet the following requirements: detecting the angle curve and torque curve of the qualified curve diagram, loading the rotation torque and angle at a frequency in the range of 1-20HZ, making the angle curve reach the range of plus or minus 1-30°, the torque is the rotation torque in the range of 1-100N.m, and the axial force of the tension and pressure sensor applies an axial load in the range of 1-10KN, completing 1 million cycles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 The present invention Figure 1 Schematic diagram of the torsion bar fatigue assembly structure at A in the middle; Figure 3 It is a structural schematic diagram of the clamping chuck of the present invention; Figure 4 It is a schematic diagram of the installation structure of the torque sensor of the present invention; Figure 5 It is a structural schematic diagram of the thread locking device of the present invention; Figure 6 It is a structural schematic diagram of the installation of the tension and pressure cylinder of the present invention.

[0016] In the figure: 1, T-type platform, 2, torque sensor base, 3, torque sensor rod, 4, torque sensor, 5, coupling, 6, torque sensor, 7, small screw, 8, chuck base, 9, handle, 10, screw, 11, nut, 12, chuck fixing plate, 13, chuck, 14, claw, 15, input shaft, 16, screw, 17, torsion bar, 18, plug, 19, rotating slot cover, 20, positioning sleeve, 21, pull pressure sensor, 22, pull pressure sensor base, 23, fixing plate, 24, pull pressure sensor shaft, 25, locking nut, 26, cylinder, 27, cylinder base. DETAILED DESCRIPTION

[0017] The automobile steering gear shaft detection device comprises a T-shaped platform 1 provided with a torque sensor base 2, a chuck base 8, a cylinder base 27, a tension and pressure sensor base 22 threadedly connected with a screw 10 and a nut 11, a torque sensor 6 threadedly connected to the torque sensor base 2 with a screw, a torque sensor rod 3 and a torque sensor 6 clearance fit locked with a screw 10, and is clearance fit connected with an inner hole of a coupling 5 and then locked with a small screw 7, and a chuck 13 is clamped by rotating an annular bar 14 is screwed into the groove of the chuck 13, and the claw 14 is rotated counterclockwise and clockwise by the handle 9 to adjust the circumference size. The chuck 13 and the chuck fixing plate 12 are connected with screws 10 and nuts 11, and the chuck base 8 is connected. The input shaft 15, the torsion bar 17, the plug 18 and the screw 16 are connected with clearance. The large hole of the screw 16 is clear with the outer circle of the input shaft 15, the torsion bar 17 is clear with the inner hole of the screw 16 rod and the inner hole of the input shaft 15, and the plug 18 is connected with the screw tail thread, and the positioning The pin 20 is driven into the small hole of the screw to lock the input shaft 15, the torsion bar 17 and the screw 16. The claw 14 clamps the outer cylindrical end of the input shaft 15. The rod of the screw 16 is placed in the positioning sleeve 20 and locked by rotating the groove cover 19 through the thread rotation. The outer thread of one end of the positioning sleeve 20 is connected to the inner thread of the tension and pressure sensor 21. The inner thread of the sensor is threadedly connected to the rod of the tension and pressure sensor shaft 24. The tension and pressure sensor shaft 24 is matched through the clearance of the tension and pressure sensor base 22. The cylinder is fixed on the cylinder base with screws 10 and threads. The tension and pressure sensor 21 is used to apply the end torque of the rod of the screw 10. The starting device applies the rotational torque on the input shaft 15 torsion bar 17 to load the rotational torque and angle at a frequency in the range of 1-20HZ, so that the angle curve reaches the range of plus or minus 1-30°, and the torque is the rotational torque in the range of 1-100N.m. The axial force of the tension and pressure sensor 21 applies an axial load in the range of 1-10KN, and completes 1 million cycles. After the test is completed, the torsion bar has no defects such as cracks.

[0018] It consists of a T-shaped platform 1 with a torque sensor base 2, a chuck base 8, a cylinder base 27, and a tension and pressure sensor base 22, which are threadedly fixed with screws 10 and nuts 11. The torque sensor 6 is threadedly connected to the torque sensor base 2 with the screw 10, and the torque sensor rod 3 and the coupling 5 are connected. The coupling is locked with a small screw 7. The chuck 13 is connected to the claw 14, and the claw 14 is adjusted by rotating the handle 9 counterclockwise and clockwise. The chuck 13 is connected to the chuck fixing plate 12 and connected to the chuck base 8. The input shaft 15, the torsion bar 17, the plug 18 and the screw 16 are connected and locked with a positioning pin 28. The claw 14 clamps Tighten the input shaft 15, put the rod of the screw rod 16 into the positioning sleeve 20, and lock it with the rotating slot cover 19. The positioning sleeve 20 is connected to the tension pressure sensor 21. The sensor is connected to the tension pressure sensor shaft 24 to fix the tension pressure sensor base 22 and fix the fixing plate 23. The locking nut is connected to the tension pressure sensor shaft 25. The cylinder 26 is fixed on the cylinder base 27. The tension pressure sensor 21 is used to apply torque to the end face of the rod of the screw rod 16. The starting device applies torque to the torsion bar 17 of the input shaft 15, so that the left and right rotation angles of the torsion bar 17 are plus or minus 7°, the frequency is 8Hz, and 750,000 cycles are completed. After the test is completed, the torsion bar has no defects such as cracks.

[0019] Detection of qualified curves, angle curve and torque curve: load the rotation torque and angle at a frequency of 1-20HZ, so that the angle curve reaches plus or minus 1-30°, the torque is 1-100N.m and other torques, and the axial force applies an axial load of 1-10KN to complete 1 million cycles, which can meet the test requirements of torsion bar fatigue. It also simulates the stress conditions of various conditions such as normal driving, emergency steering, continuous curves, bumpy roads, etc. of the car to detect whether it causes cracks and fractures in the torsion bar.

Claims

1. A vehicle steering gear torsion bar fatigue test detection device, comprising a T-shaped platform, a torque sensor base, a tension and pressure sensor base, a chuck base, a cylinder base, a torque sensor, a tension and pressure sensor, a chuck, a cylinder, a rotating slot cover, and a positioning sleeve, characterized in that: The torque sensor base, chuck base, cylinder base, and tension and pressure sensor base are fixed on the T-type platform with screws respectively. The torque sensor is fixed to the sensor base with screws. The torque sensor rod and the torque sensor clearance are locked with screws, and the clearance with the inner hole of the coupling is connected and locked with small screws. The chuck screws the claws into the chuck groove by rotating the annular bar. The chuck and the chuck fixing plate are matched with screws and nuts to connect the chuck base. The input shaft, torsion bar, plug and screw clearance are matched. The large hole of the screw and the outer circle of the input shaft clearance are matched. The torsion bar The inner hole of the screw rod and the inner hole of the input shaft are matched with each other, the plug is threadedly connected to the tail of the screw, the small hole of the screw is locked with the input shaft, torsion bar and screw through the locating pin, the claw clamps the outer circular end of the input shaft, the screw rod is placed in the locating sleeve, the rotating slot cover is locked by threaded rotation, the external thread at one end of the locating sleeve is connected to the internal thread of the tension pressure sensor, the internal thread of the sensor is threadedly connected to the shaft of the tension pressure sensor, the shaft of the tension pressure sensor is matched with the clearance of the tension pressure sensor base hole, the cylinder is fixed on the cylinder base, and the end face torque of the screw rod is given through the tension pressure sensor.

2. The automobile steering gear torsion bar fatigue test detection device according to claim 1, characterized in that: The T-shaped platform is in a rectangular shape, with a T-shaped slot on the platform, screws in the slot, and nuts connected with the screws, so that the front and rear distances can be adjusted at will to meet the needs of various lengths of parts.

3. The automobile steering gear torsion bar fatigue test detection device according to claim 2, characterized in that: The torque sensor base, the tension and pressure sensor base, the chuck base, and the ends of the cylinder base are threadedly connected with the base through fixing screws and nuts.

4. The automobile steering gear torsion bar fatigue test detection device according to claim 3, characterized in that: One end of the torque sensor is fixed on the torque sensor base by a screw thread, and the inner hole of the other end is connected to the torque sensor connecting rod by clearance fit.

5. The automobile steering gear torsion bar fatigue test detection device according to claim 4, characterized in that: The tension and pressure sensor is threadedly connected to the internal thread of the tension and pressure sensor by the positioning sleeve rod, the internal thread of the sensor is threadedly connected to the cylinder shaft rod, the cylinder shaft is matched through the clearance of the tension and pressure sensor base hole, and the cylinder is fixed to the cylinder base with screws and threads.

6. The automobile steering gear torsion bar fatigue test detection device according to claim 5, characterized in that: The chuck is screwed into the chuck groove by rotating the annular bar, and the circumference of the chuck is adjusted by rotating the handle counterclockwise or clockwise. The chuck and the chuck fixing plate are connected with screws and nuts and connected to the chuck base.

7. The automobile steering gear torsion bar fatigue test detection device according to claim 6, characterized in that: The cylinder is provided with a cylinder threadedly connected to a cylinder base through a screw, and an axial load torque is applied to the end face of the screw rod through a tension pressure sensor.

8. The automobile steering gear torsion bar fatigue test detection device according to claim 7, characterized in that: The rotating slot cover is connected with the positioning sleeve thread.

9. A vehicle steering gear torsion bar fatigue detection device according to any one of the above claims, characterized in that: The specific detection method is to rotate the slot cover and the positioning sleeve to fix the screw rod, and the claw is adjusted by rotating the handle to fix the input shaft. The rotation torque and angle are loaded at a frequency in the range of 1-20HZ, so that the angle curve reaches the range of plus or minus 1-30°, the torque is the rotation torque in the range of 1-100N.m, and the axial force of the tension and pressure sensor applies an axial load in the range of 1-10KN. After completing 1 million cycles, there is no crack in the torsion bar after the test is completed.

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