Fatigue testing device for vehicle door lock

Abstract

The utility model discloses a fatigue testing device for a vehicle door lock, which comprises a workbench and a reversing mechanism arranged on the workbench, and the reversing mechanism comprises a steering seat, a cylinder, a mounting seat, a side plate, a shaft sleeve, a polished rod and a magnetic induction type sensor. Angle deviation of the air cylinder caused by movement track change of the lock pull rod can be automatically compensated, interference generated during simulation unlocking is eliminated, the limiting mechanism composed of the polished rod and the shaft sleeve protects the output shaft of the air cylinder, the phenomena of abrasion, leakage or clamping stagnation of the output shaft of the air cylinder due to bearing of non-axial force are avoided, and the service life of the testing device is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of fatigue testing, and in particular to a fatigue testing device for car door locks. Background Technology

[0002] Door locks are a key component of automotive safety systems, and their reliability is directly related to the safety of vehicle use and the personal safety of passengers. Door locks need to undergo frequent opening and closing operations in actual use, and their internal locking rod structure is prone to fatigue failure under long-term reciprocating motion. Therefore, it is necessary to conduct a service life test of more than 100,000 cycles during the research and development and production stages.

[0003] However, traditional car door lock fatigue testing devices rely solely on independent cylinders to simulate the unlocking action. Since the movement trajectory of the lock lever is a rotary motion, the output rod of the cylinder must constantly bear non-axial lateral loads during operation. Long-term testing can easily cause wear, leakage, or even failure of the cylinder seals. Utility Model Content

[0004] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is: a fatigue testing device for car door locks, including a workbench and a reversing mechanism disposed on the workbench. The reversing mechanism includes a steering seat, a cylinder, a mounting seat, a side plate, a bushing, a guide rod, and a magnetic induction sensor. The cylinder is rotatably connected to the steering seat. The output end of the cylinder is fixedly connected to a mounting seat for connecting an external lock lever input end. The cylinder is provided with a magnetic induction sensor for determining whether the mounting seat is in position. The cylinder is fixedly connected to a bushing through the side plate. The bushing is slidably connected to a guide rod connected to the mounting seat.

[0005] Using the above technical solution, during testing, the mounting base is bolted to the locking rod. The cylinder is activated to simulate the unlocking action of the car door lock. Two sets of magnetic induction sensors detect and count the piston position inside the cylinder to meet the requirements of fatigue testing. Since the unlocking action of the locking rod is a rotary action, and the cylinder can rotate relative to the steering seat during operation, the rotation of the entire cylinder is controlled to automatically compensate for the angular deviation caused by the change in the movement trajectory of the locking rod, eliminating interference generated during simulated unlocking. The limiting mechanism composed of the smooth rod and the bushing protects the output shaft of the cylinder, preventing wear, leakage, or jamming of the output shaft due to non-axial force, thus improving the service life of the testing device.

[0006] The present invention is further provided that the bushing has a through hole on its circumferential surface, and a solid lubricant is provided in the through hole.

[0007] Furthermore, the bushing is provided with through holes arranged in a spiral pattern.

[0008] Using the above technical solution, the solid lubricant is graphite or molybdenum disulfide, and the solid lubricant is spirally distributed on the bushing. During the movement of the smooth rod, the solid lubricant can be evenly distributed on the surface of the smooth rod in a circular pattern, which reduces the friction coefficient between the smooth rod and the bushing and improves the service life of the structure.

[0009] The present invention is further configured such that the mounting base is provided with threaded hole one and threaded hole two, the side plate is provided with mounting hole one and mounting hole two corresponding to threaded hole one and threaded hole two, and threaded hole three for connecting the bushing, the cylinder body of the cylinder is threadedly connected to mounting hole one by a nut, the output end of the cylinder is threadedly connected to threaded hole one, and the bushing and the polished rod are respectively provided at mounting hole two and threaded hole two.

[0010] Furthermore, the bushing is provided with a mounting part and a cylindrical part. The mounting part is provided with a mounting hole three corresponding to the threaded hole three. The cylindrical part passes through the mounting hole two and is fitted with a smooth rod.

[0011] By adopting the above technical solution, the hole spacing of threaded hole one and threaded hole two is the same as that of mounting hole one and mounting hole two, thereby realizing that the output shaft of the cylinder is parallel to the guide rod, making the reciprocating motion of the mounting seat smooth and stable.

[0012] The present invention is further configured such that the magnetic induction sensor is fixedly connected to both sides of the cylinder body by clamps.

[0013] Using the above technical solution, the magnetic induction sensor is a magnetic switch sensor used to detect whether the piston in the cylinder is in position. It can be used not only for counting but also for error alarms. When the door lock is stuck or the cylinder does not move to the correct position, the corresponding magnetic switch sensor will not receive a signal within a specified time and will trigger an alarm. The tester will then record the current number of unlocking attempts and troubleshoot the problem, thus improving the safety and automation of the test.

[0014] The present invention is further configured such that the steering seat is provided with a screw, the cylinder is provided with an inner hole adapted to the screw, and the cylinder is rotatably connected to the steering seat by the screw.

[0015] Using the above technical solution, the cylinder is rotatably connected to the steering seat by screws. The overall structure is simple. When the cylinder fails, it can be directly repaired or replaced on the workbench, which greatly improves maintenance efficiency.

[0016] The present invention is further configured to include a load simulation mechanism, which includes a fixed base, a torsion spring and a positioning rod. The fixed base is fitted with a torsion spring, and the positioning rod is located on one side of the fixed base. One end of the torsion spring abuts against the positioning rod, and the other end abuts against the output end of the locking rod.

[0017] Using the above technical solution, one lever arm of the torsion spring acts on the positioning rod to constrain the torsion spring body and prevent it from rotating relative to the fixed seat, while the other lever arm acts on the output end of the lock lever to simulate the load force generated by the car door lock when it is actually unlocked, making the test results more realistic.

[0018] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a perspective view of the reversing mechanism of this utility model;

[0021] Figure 3 This is a perspective view of the load simulation mechanism of this utility model;

[0022] Figure 4 This is a perspective view of the bushing of this utility model;

[0023] Figure 5 This is a perspective view of the mounting base of this utility model;

[0024] Figure 6 This is a front view of the side panel of this utility model;

[0025] Wherein: 1-Workbench, 2-Reversing mechanism, 3-Load simulation mechanism, 4-Lock rod, 21-Steering seat, 22-Cylinder, 23-Mounting seat, 24-Side plate, 25-Busset, 26-Smooth rod, 27-Magnetic induction sensor, 28-Solid lubricant, 29-Screw, 221-Inner hole, 231-Threaded hole one, 232-Threaded hole two, 241-Mounting hole one, 242-Mounting hole two, 243-Threaded hole three, 251-Through hole, 252-Mounting part, 253-Cylindrical part, 254-Mounting hole three, 31-Fixed seat, 32-Torsion spring, 33-Positioning rod; Detailed Implementation

[0026] The embodiments of this utility model will now be described with reference to the accompanying drawings. In this process, to ensure clarity and convenience, we may exaggerate the width of lines or the size of constituent elements in the drawings.

[0027] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the intentions or conventions of the user or operator. Therefore, these terms are defined based on the entire contents of this specification.

[0028] like Figure 1 , 2As shown, this utility model provides a fatigue testing device for car door locks, including a workbench 1, a reversing mechanism 2 and a load simulation mechanism 3 disposed on the workbench 1. The reversing mechanism 2 includes a steering seat 21, a cylinder 22, a mounting seat 23, a side plate 24, a bushing 25, a guide rod 26 and a magnetic induction sensor 27. The steering seat 21 is rotatably connected to the cylinder 22. The output end of the cylinder 22 is fixedly connected to the mounting seat 23 for connecting an external lock lever input end. The cylinder 22 is provided with a magnetic induction sensor 27 for determining whether the mounting seat 23 is in position. The cylinder 22 is fixedly connected to the bushing 25 through the side plate 24. The bushing 25 is slidably connected to the guide rod 26 connected to the mounting seat 23.

[0029] The load simulation mechanism 3 includes a fixed base 31, a torsion spring 32, and a positioning rod 33. The fixed base 31 is fitted with the torsion spring 32, and the positioning rod 33 is located on one side of the fixed base 31. One end of the torsion spring 32 abuts against the positioning rod 33, and the other end abuts against the output end of the locking rod.

[0030] In this embodiment, the bushing 25 has through holes 251 on its circumferential surface, and solid lubricant 28 is provided in the through holes 251. The bushing 25 has through holes 251 arranged in a spiral pattern. The solid lubricant 28 is graphite or molybdenum disulfide, and the solid lubricant 28 is spirally distributed on the bushing 25. During the movement of the smooth rod 26, the solid lubricant 28 can be evenly distributed on the surface of the smooth rod 26 in a circular pattern, which reduces the coefficient of friction between the smooth rod 26 and the bushing 25 and improves the service life of the structure.

[0031] In this embodiment, the mounting base 23 is provided with a first threaded hole 231 and a second threaded hole 232, the side plate 24 is provided with a first mounting hole 241 and a second mounting hole 242 corresponding to the first threaded hole 231 and the second threaded hole 232, and a third threaded hole 243 for connecting the bushing 25. The cylinder body of the cylinder 22 is threadedly connected to the first mounting hole 241 by a nut, and the output end of the cylinder 22 is threadedly connected to the first threaded hole 231. The bushing 25 and the polished rod 26 are respectively provided in the second mounting hole 242 and the threaded hole. At position 232, the bushing 25 is provided with a mounting part 252 and a cylindrical part 253. The mounting part 252 is provided with a mounting hole 254 corresponding to the threaded hole 243. The cylindrical part 253 passes through the mounting hole 242 and is fitted with a smooth rod 26. The hole spacing of the threaded hole 1 231 and the threaded hole 232 is the same as the hole spacing of the mounting hole 1 241 and the mounting hole 242, thereby realizing that the output shaft of the cylinder 22 is parallel to the smooth rod 26, so that the reciprocating motion of the mounting seat 23 is smooth and stable.

[0032] In this embodiment, the magnetic induction sensor 27 is fixedly connected to both sides of the cylinder body of the cylinder 22 by clamps. The magnetic induction sensor 27 is a magnetic switch sensor.

[0033] In this embodiment, the steering seat 21 is provided with screws 29, and the cylinder 22 is provided with an inner hole 221 that is adapted to the screws 29. The cylinder 22 is rotatably connected to the steering seat 21 by the screws 29. The overall structure is simple. When the cylinder 22 fails, it can be directly repaired or replaced on the workbench 1, which greatly improves maintenance efficiency.

[0034] The working principle of this utility model is as follows: During testing, the mounting base 23 is bolted to the input end of the locking rod 4, and the lever arm of the torsion spring 32 acts on the output end of the locking rod 4, activating the cylinder 22 and driving the locking rod 4 to perform reciprocating rotational motion. At this time, the cylinder 22 can adaptively rotate around the screw 29 on the steering seat 21, automatically compensating for the deviation and thus eliminating motion interference. At the same time, the limiting mechanism formed by the smooth rod 26 and the bushing 25 protects the cylinder 22 from non-axial forces. The magnetic switch sensor detects whether the piston in the cylinder 22 is in position and uses it for counting. When the door lock is stuck and the cylinder 22 does not move to the correct position, the corresponding magnetic switch sensor will not receive a signal within 3 seconds and will trigger an alarm. The tester records the current number of unlocking attempts and ends the test. After troubleshooting, the next door lock is replaced and the test is repeated.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fatigue testing device for a car door lock, characterized in that, The utility model provides a reversing mechanism, including workbench (1), and be located workbench (1) on reversing mechanism (2), reversing mechanism (2) including steering seat (21), pneumatic cylinder (22), mounting seat (23), side plate (24), shaft sleeve (25), light rod (26) and magnetic inductive sensor (27), steering seat (21) rotationally connected with pneumatic cylinder (22), and the output end of pneumatic cylinder (22) is fixedly connected with the mounting seat (23) for the input end of external connection lock pull rod, and pneumatic cylinder (22) is equipped with the magnetic inductive sensor (27) for judging whether mounting seat (23) is in place, and pneumatic cylinder (22) is fixedly connected with shaft sleeve (25) through side plate (24), and shaft sleeve (25) is slidably connected with light rod (26) connected with mounting seat (23).

2. A fatigue testing device for a door lock of a vehicle door according to claim 1, characterized in that: The circumferential surface of the shaft sleeve (25) is provided with a through hole (251), and the through hole (251) is provided with a solid lubricant (28).

3. A fatigue testing device for a door lock of a vehicle door according to claim 2, characterized in that: The shaft sleeve (25) is provided with a spiral staggered distribution through hole (251).

4. A fatigue testing device for a door lock of a vehicle door according to claim 1, characterized in that: The mounting seat (23) is provided with a threaded hole one (231) and a threaded hole two (232), the side plate (24) is provided with a mounting hole one (241) and a mounting hole two (242) corresponding to the threaded hole one (231), the threaded hole two (232) and a threaded hole three (243) for connecting the shaft sleeve (25), the cylinder body of the pneumatic cylinder (22) is threadedly connected to the mounting hole one (241), the output end of the pneumatic cylinder (22) is threadedly connected to the threaded hole one (231), and the shaft sleeve (25) and the light rod (26) are arranged at the mounting hole two (242) and the threaded hole two (232) respectively.

5. A fatigue testing device for a door lock of a vehicle door according to claim 2, characterized in that: The shaft sleeve (25) is provided with a mounting part (252) and a cylindrical part (253), the mounting part (252) is provided with a mounting hole three (254) corresponding to the threaded hole three (243), and the cylindrical part (253) is sleeved with the light rod (26) through the mounting hole two (242).

6. A fatigue testing device for a door lock of a vehicle door according to claim 1, characterized in that: The magnetic inductive sensor (27) is fixedly connected to the cylinder body of the pneumatic cylinder (22) on both sides by a clamp.

7. A fatigue testing device for a door lock of a vehicle door according to claim 1, characterized in that: The steering seat (21) is provided with a screw (29), the pneumatic cylinder (22) is provided with an inner hole (221) matched with the screw (29), and the pneumatic cylinder (22) is rotatably connected to the steering seat (21) through the screw (29).

8. A fatigue testing device for a door lock of a vehicle door according to claim 1, characterized in that: Further comprising a load simulation mechanism (3), the load simulation mechanism (3) includes a fixed seat (31), a torsional spring (32) and a positioning rod (33), the fixed seat (31) is sleeved with the torsional spring (32), the positioning rod (33) is arranged on one side of the fixed seat (31), one end of the torsional spring (32) abuts against the positioning rod (33), and the other end abuts against the output end of the lock pull rod.

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