Endurance test device for vehicle door lock

Abstract

A vehicle door lock endurance test device relates to the technical field of vehicle part testing, and comprises a rack and at least one vehicle door simulation station, and each station comprises a vehicle door simulation device installed on the rack and used for simulating a vehicle door; the vehicle door inner and outer pull rod device is mounted on the vehicle door simulation device and used for simulating door opening through inner and outer vehicle door handles; one end of the vehicle door opening and closing power assisting device is connected with the vehicle door simulation device, and the other end is fixed on the rack and used for simulating power-assisted opening and closing of the vehicle door; the damping device is installed on the simulation vehicle door device and the rack and used for absorbing impact force generated by collision between the simulation vehicle door device and the rack; the full-lock / half-lock switching device is mounted on the rack and the vehicle door simulation device and is used for simulating and controlling the locking state of a vehicle door lock; and the controller is used for controlling the action of each component. According to the invention, multi-state testing can be carried out at the same time, the experiment efficiency can be improved, the experiment cost can be reduced, vibration interference can be reduced, and the accuracy of experiment data is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive component testing, and particularly to a device for simulating the durability test of a car door lock in multiple states. Background Art

[0002] In the automotive industry, the durability of a car door lock is one of the key indicators to measure its quality, and the durability test of a car door lock is a crucial link to verify the reliability of the door lock. Currently, there are many deficiencies in the technology of car door lock durability test devices. For example, in the common test method of installing the car door lock on a simple flipping frame and driving it to open and close reciprocally by cylinders at both ends of the frame, there are problems of large experimental vibrations, which not only affect the service life of the door lock but also lead to inaccurate experimental data. Moreover, the existing devices cannot verify the inner and outer door openings and the fully locked and half-locked states of the car door simultaneously, resulting in a deviation between the experimental data and the actual application, making it difficult to comprehensively and accurately evaluate the performance of the car door lock. In addition, the structural design of some existing devices is not reasonable enough. By arranging driving cylinders at both ends of the frame, when the two cylinders do not act simultaneously, it is easy to pull the car door off to one side.

[0003] The utility model patent with the authorization announcement number CN213336753U discloses an automotive door lock durability test device, which drives a push rod through a rotating motor to simulate the actions of unlocking and opening the door by hand, solving the problem of data deviation caused by simply mechanically pulling the door handle. However, this device still has the following deficiencies: 1. Insufficient vibration control: No shock absorption device is configured, and the vibration is directly transmitted to the frame during the experiment, affecting the service life of the door lock and the accuracy of the data; 2. Single function: It cannot test the inner door opening, outer door opening, and the switching between the fully locked / half-locked states simultaneously, and step-by-step experiments are required, resulting in low efficiency; 3. Poor driving synchronization: Adopting a single-side driving structure, it does not solve the problem of the car door skewing caused by the asynchronous actions of multiple cylinders; 4. Lack of multi-station integration: It only supports single car door testing and cannot meet the requirements of batch experiments. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a car door lock durability test device that can perform multi-state tests simultaneously, reduce vibration interference, and improve experimental efficiency.

[0005] The technical solution for solving the above technical problem is: a car door lock durability test device, including a frame and at least one simulated car door station installed on the frame. Each simulated car door station includes: A simulated car door device, installed on the frame, used to simulate a car door, with the inner end being the hinge end and the outer end being the door lock end; An inner and outer door pull rod device, installed on the simulated car door device, used to simulate opening the door through the inner and outer door handles; A door opening / closing assist device, one end of which is connected to a simulated door device and the other end is fixed to a frame, is used to simulate assisting in opening and closing the door; A shock absorption device is installed at the hinge end of the simulated door device and the frame, and is used to absorb the impact force generated by the collision between the simulated door device and the frame; A full lock / half lock switching device is installed on the frame and the door lock end of the simulated door device, and is used to simulate controlling the locking state of the door lock; A controller is used to control the actions of the inner and outer door pull rod devices, the door opening / closing assist device, and the full lock / half lock switching device.

[0006] A further technical solution of the present invention is that the simulated door device includes a door frame, a first mounting plate, a door hinge, a connecting plate, a lock body, and a cable; the door frame is a square frame, and the inner end of the door frame is connected to the connecting plate through the door hinge; the middle of the connecting plate is hinged to the frame; a plurality of threaded holes for installing the inner and outer door pull rod devices are provided on the first mounting plate, and the first mounting plate is installed in the middle of the door frame. The lock body is installed in the middle of the outer end of the door frame, and the lock body is connected to the cable for controlling the opening of the lock body.

[0007] A still further technical solution of the present invention is that the inner and outer door pull rod device includes a bottom plate, a first cylinder, a slider, a cable fixing plate, a limiting plate, and a guide rail; the bottom plate and the first cylinder are respectively fixed on the first mounting plate. The bottom plate is an L-shaped structure, and the guide rail is installed on the bottom plate. A cable passing hole is provided at the front end of the bottom plate, and the limiting plate for limiting the cable to prevent the cable from falling out due to vibration is connected. The slider is installed on the guide rail, one end of the slider is connected to the first cylinder, the other end of the slider is connected to the cable fixing plate, and the cable fixing plate is connected to the cable.

[0008] A further technical solution of the present invention is that the door opening and closing assist device mainly consists of a clamping block, a transverse pull rod, a second cylinder, a third cylinder, a second mounting plate, a limiting ring, a longitudinal pull rod, a third mounting plate, a hinge seat, a guide sleeve, and a guide rod; the clamping block is a semi-concave block, which is connected to the door frame; both ends of the transverse pull rod are respectively connected to the clamping block; the longitudinal pull rod is in a U shape, the open end of the longitudinal pull rod is fixed on the second mounting plate, and the U-shaped opening of the longitudinal pull rod passes through the transverse pull rod to form a cross with the transverse pull rod; the limiting ring is fixed in the middle of the transverse pull rod to prevent the longitudinal pull rod from moving axially along the transverse pull rod; the second mounting plate is fixed on the piston rod of the third cylinder; the second cylinder is a small cylinder, fixed on the second mounting plate, and when the piston rod of the second cylinder extends, it directly abuts against the transverse pull rod; the third cylinder is installed on the third mounting plate, guide sleeves are installed at both ends of the third mounting plate, the guide rod passes through the guide sleeve and is fixed on the second mounting plate; the tail of the third cylinder is hinged to the hinge seat; the hinge seat is fixed on the frame, and the cylinder diameter ratio of the second cylinder to the third cylinder is 1:(2.5 - 3).

[0009] A further technical solution of the present invention is that the shock absorption device includes a spring, a first limiting seat, a screw rod, a second limiting seat, a locking nut, an adjusting nut, a bearing seat, a bearing, and a pin shaft; one end of the first limiting seat is fixed on the connecting plate of the simulated door device, and a waist-shaped hole that allows the screw rod to move axially along it is processed at the other end of the first limiting seat; the second limiting seat is installed on the frame opposite to the first limiting seat; the screw rod is locked on the second limiting seat through the locking nut; the spring is sleeved on the screw rod, and the compression amount of the spring is adjusted by the adjusting nut threadedly connected to the screw rod; the bearing seat is fixed on the connecting plate of the simulated door device; the bearing is installed in the bearing seat; the pin shaft passes through the bearing and the middle of the connecting plate of the simulated door device and is fixed on the frame.

[0010] A further technical solution of the present invention is that the full lock / semi-lock switching device includes an upper buffer mechanism, an upper connecting plate, a lower buffer block, a switching plate, a guide rod, a guide sleeve, a switching cylinder, and a lower connecting plate; the upper buffer mechanism is installed on the upper connecting plate, and the upper buffer mechanism is connected to the door frame through a door frame connecting block; the lower buffer block is fixed on the switching plate through a screw rod; the guide rod is installed on the switching plate; the guide sleeve is installed on the lower connecting plate, and the guide rod sequentially passes through the lower connecting plate and the guide sleeve; the lower connecting plate is connected to the frame through the frame connecting blocks at both ends; the switching cylinder is fixed at the bottom of the lower connecting plate, and the piston rod of the switching cylinder passes through the lower connecting plate and is connected to the switching plate.

[0011] A further technical solution of the present invention is that the upper buffer mechanism includes an upper buffer block and an oil buffer; the upper buffer block is a rubber block, which is locked on the upper connecting plate through bolts; the oil buffer is an oil pressure spring, installed in the middle of the upper connecting plate.

[0012] A further technical solution of the present invention is that the test device further includes a door lock buckle installation device, which includes a limit block I, a longitudinal guide block, a longitudinal slider, a transverse slider, a lock buckle, a lock buckle installation block, and a limit block II; the longitudinal guide block is fixed on the rack on one side of the door lock end of the simulated door device, and a longitudinal dovetail-shaped convex platform is processed on the upper part of the longitudinal guide block, and the limit block I is fixed at both ends of the longitudinal dovetail-shaped convex platform respectively; a longitudinal dovetail-shaped groove matching with the longitudinal dovetail-shaped convex platform is processed on the lower part of the longitudinal slider, a transverse dovetail-shaped groove is processed on the upper part of the longitudinal slider, and the limit block II is fixed at both ends of the transverse dovetail-shaped groove respectively, and longitudinal waist holes for adjusting the longitudinal position of the lock buckle are processed at the four corners of the longitudinal slider respectively; a transverse dovetail-shaped convex platform matching with the transverse dovetail-shaped groove is processed on the lower part of the transverse slider, and transverse waist holes for adjusting the transverse position of the lock buckle are processed on both sides of the transverse slider; the lock buckle installation block is an L-shaped block, which is fixed on the transverse slider, and the lock buckle matching with the lock body is installed on the side wall of the lock buckle installation block.

[0013] A further technical solution of the present invention is that the test device further includes a guiding device installed at the upper and lower ends of the door frame, which includes a guiding bracket, a ball, and a ball bracket. The guiding bracket is an L-shaped block with a chamfer, and the guiding bracket is fixedly installed on the racks on the upper and lower sides of the door lock end of the door frame; the ball is a round steel ball and is fixed on the door frame through the ball bracket, and a raceway for the ball to roll in is arranged in the ball bracket.

[0014] A further technical solution of the present invention is that the rack includes an installation bracket, a side shock-absorbing rubber pad, a side shock-absorbing foot seat, a base, and a bottom shock-absorbing rubber pad; the installation bracket is a trapezoidal frame, the side shock-absorbing rubber pad is a high-hardness rubber and is installed on the side shock-absorbing foot seat, the base is a flat steel plate for installing each component of the rack; the bottom shock-absorbing rubber pad is a high-hardness rubber and is fixed at the bottom of the installation bracket.

[0015] Due to the adoption of the above structure, compared with the prior art, a door lock durability test device of the present invention has the following beneficial effects: 1. It can perform multi-state tests simultaneously Each simulated door station of the present invention includes a simulated door device, a door opening and closing assisting device, a door inner and outer pull rod device, a shock-absorbing device, and a full-lock / half-lock switching device. Among them, through the door inner and outer pull rod device and the full-lock / half-lock switching device, durability tests of simultaneously simulating opening the door inside the vehicle, opening the door outside the vehicle, the full-lock state and the half-lock state of the door can be realized, and the full-lock / half-lock switching device can switch between full-lock and half-lock and conduct experiments simultaneously during the experiment, without separating the full-lock and half-lock experiments, effectively improving the experimental efficiency and reducing the experimental cost.

[0016] 2. Can reduce vibration interference The shock-absorbing device of the present invention can flexibly connect the simulated door device to the frame. The simulated door device can rotate around the pin shaft connected to the frame. At the same time, two high-strength springs are arranged to prevent the door from rotating. By adjusting the compression of the springs, the door is ensured to be in a horizontal position. The vibration energy generated during the experiment will be absorbed by the springs at both ends and will not act on the frame, greatly reducing vibration interference, thereby ensuring the stability of the frame. Therefore, the present invention can perform four door lock durability tests simultaneously on the same frame.

[0017] Furthermore, the fully locked / partially locked switching mechanism of the present invention incorporates a buffer block-level hydraulic spring to mitigate vibration caused by inertia when the door closes. Furthermore, a ball bearing guide mechanism is designed at the lock end to reduce frictional noise when the door closes. Furthermore, the bottom and sides of the frame of the present invention are supported by rubber, effectively reducing experimental vibration. Therefore, the present invention significantly reduces experimental vibration interference, resulting in more accurate experimental data.

[0018] 3. Extend the life of the experimental device The present invention can ensure that the vehicle door is in a horizontal position, reduce the moment at the hinge, and extend the service life of the experimental device.

[0019] 4. Improve experimental efficiency The vehicle door opening and closing assist device of the present invention is designed with large and small double cylinders for assisting. The reason for using double cylinders of different sizes to drive is: the third cylinder, which is a small cylinder, has a small cylinder body, and compressed air can quickly fill the cylinder body, and the cylinder response is relatively fast, while the second cylinder, which is a large cylinder, has a relatively large cylinder body, and it takes a certain amount of time for compressed air to fill the cylinder body, and the cylinder response is relatively slow; when the large cylinder is still inflating, the small cylinder is already filled, and the vehicle door is first pushed out an angle to the extreme extension range of the small cylinder. The large cylinder has just finished intake and starts to respond, and continues to push the vehicle door open, thereby reducing the cylinder response time, which can speed up the opening and closing speed of the vehicle door, and effectively reduce the experimental time.

[0020] In addition, the present invention can perform four vehicle door lock durability tests simultaneously on the same rack, which can greatly improve the experimental efficiency.

[0021] 5. Good drive synchronization The door opening and closing assist device of the present invention adopts a cross-shaped arrangement of a transverse pull rod and a longitudinal pull rod, and adopts a single set of cylinders at the cross position to drive the door to open and close, thereby solving the problem of cylinder asynchrony caused by arranging two driving cylinders on both sides of the door.

[0022] 6. Reduce processing difficulty The door lock buckle installation device of the present invention uses two sets of cross-shaped dovetail grooves and is combined with horizontal and vertical waist-shaped holes, which can achieve the adjustment of the lock opening in both horizontal and vertical directions, reduce the machining accuracy of the experimental device, and thus reduce the machining difficulty of the experimental device.

[0023] Next, in conjunction with the drawings and embodiments, the technical features of a door lock durability test device of the present invention will be further described. Description of the Drawings

[0024] Figure 1 : Schematic structural diagram of a door lock durability test device of the present invention, Figure 2 : Schematic structural diagram of a single simulated door station (including the frame); Figure 3 : Front view of the frame described in Embodiment 1, Figure 4 : Figure 3 Top view of Figure 5 : Three-dimensional structural diagram of the frame described in Embodiment 1; Figure 6 : Front view of the simulated door device described in Embodiment 1, Figure 7 : Figure 6 Top view of Figure 8 : Three-dimensional structural diagram of the simulated door device described in Embodiment 1; Figure 9 : Front view of the inner and outer door pull rod device described in Embodiment 1, Figure 10 : Figure 9 Top view of Figure 11 : Three-dimensional structural diagram of the inner and outer door pull rod device described in Embodiment 1; Figure 12 : Front view of the door opening and closing assist device described in Embodiment 1, Figure 13 : Figure 12 Left view of Figure 14 : Figure 12 Top view of Figure 15 : Three-dimensional structural diagram of the door opening and closing assist device described in Embodiment 1, Figure 16 : Schematic diagram of the door opening and closing assist device described in Embodiment 1 installed on the door frame; Figure 17 : Figure 18 Right view of Figure 18: Front view of the shock absorption device described in Embodiment 1, Figure 19 : Figure 18 Left view of Figure 20 : Perspective structure schematic diagram of the shock absorption device described in Embodiment 1; Figure 21 : Front view of the full-lock / semi-lock switching device described in Embodiment 1, Figure 22 : Perspective structure schematic diagram of the full-lock / semi-lock switching device described in Embodiment 1, Figure 23 : Schematic diagram of the full-lock / semi-lock switching device installed on the car door frame; Figure 24 : Figure 25 Right view of Figure 25 : Front view of the car door lock buckle installation device described in Embodiment 1, Figure 26 : Figure 25 Left view of Figure 27 : Perspective structure schematic diagram of the car door lock buckle installation device described in Embodiment 1, Figure 28 : Exploded view of the components of the car door lock buckle installation device described in Embodiment 1; Figure 29 : Structure schematic diagram of the guiding device described in Embodiment 1 (including the car door frame), Figure 30 : Schematic diagram of the guiding device installed on the car door frame; In the above-mentioned drawings, the reference numerals are explained as follows: 1 - Frame, 11 - Mounting bracket, 12 - Side shock absorption rubber pad, 13 - Side shock absorption footrest, 14 - Base, 15 - Bottom shock absorption rubber pad; 2 - Simulated car door station, 21 - Simulated car door device, 211 - Car door frame, 212 - First mounting plate, 213 - Car door hinge, 214 - Connecting plate, 215 - Lock body, 216 - Cable; 22 - Inner and outer car door pull rod device, 221 - Bottom plate, 2211 - Cable through hole, 222 - First cylinder, 223 - Slide block, 224 - Cable fixing plate, 225 - Limiting plate, 226 - Guide rail; 23 - Car door opening and closing assist device, 231 - Clamping block, 232 - Horizontal pull rod, 233 - Second cylinder, 234 - Third cylinder, 235 - Second mounting plate, 236 - Limiting ring, 237 - Longitudinal pull rod, 238 - Third mounting plate, 239 - Hinge seat, 2310 - Guide sleeve, 2311 - Guide rod; 24 - Shock Absorbing Device, 241 - Spring, 242 - First Limit Seat, 243 - Screw Rod, 244 - Second Limit Seat, 245 - Locking Nut, 246 - Adjusting Nut, 247 - Bearing Seat, 248 - Bearing, 249 - Pin Shaft; 25 - Full Lock / Half Lock Switching Device, 251 - Upper Buffer Mechanism, 2511 - Upper Buffer Block, 2512 - Oil Pressure Buffer, 252 - Upper Connecting Plate, 253 - Lower Buffer Block, 254 - Switching Plate, 255 - Guide Rod, 256 - Guide Sleeve, 257 - Switching Cylinder, 258 - Lower Connecting Plate, 259 - Door Frame Connecting Block, 2510 - Frame Connecting Block; 26 - Door Lock Latch Installation Device, 261 - Limit Block Ⅰ, 262 - Longitudinal Guide Block, 2621 - Longitudinal Dovetail - shaped Boss; 263 - Longitudinal Slide Block, 2631 - Longitudinal Dovetail - shaped Groove, 2632 - Transverse Dovetail - shaped Groove, 2633 - Longitudinal Waist - shaped Hole; 264 - Transverse Slide Block, 2641 - Transverse Dovetail - shaped Boss, 2642 - Transverse Waist - shaped Hole; 265 - Latch, 266 - Latch Installation Block, 267 - Limit Block Ⅱ; 27 - Guide Device, 271 - Guide Bracket, 272 - Ball, 273 - Ball Bracket. Detailed Implementation Manner Embodiment 1

[0025] Figure 1 Disclosed herein is a door lock durability test device, including a frame 1 and four simulated door stations 2 installed on the frame 1 for simultaneously simulating the durability tests of four door locks. As Figure 2 shown, each simulated door station 2 includes: A simulated door device 21, installed on the frame 1, for simulating an automobile door, with the inner end being the hinge end and the outer end being the door lock end; An inner - outer door pull rod device 22, installed on the simulated door device 21, for simulating opening the door through the inner and outer door handles; A door opening - closing assist device 23, with one end connected to the simulated door device 21 and the other end fixed to the frame 1, for simulating assisting in opening and closing the door; A shock absorbing device 24, installed at the hinge end of the simulated door device 21 and on the frame 1, for absorbing the impact force generated by the collision between the simulated door device and the frame; A full lock / half lock switching device 25, installed on the frame 1 and the door lock end of the simulated door device 21, for simulating controlling the locking state of the door lock; A door lock latch installation device 26, installed on the frame 1 on one side of the door lock end of the simulated door device 21, for simulating the installation of the latch; The guiding device 27 is installed on the upper and lower sides of the door lock end of the simulated door device 21 and is used to correct the position of the door when the door is closed, so that the lock body and the lock catch are correspondingly matched to lock the door.

[0026] The controller is used to control the actions of the inner and outer door pull rod device 22, the door opening and closing assist device 23, and the full lock / half lock switching device 25. The controller is not shown in the figure.

[0027] As Figures 3 - 5 shown, the frame 1 includes an installation bracket 11, a side shock-absorbing rubber pad 12, a side shock-absorbing footrest 13, a base 14, and a bottom shock-absorbing rubber pad 15; the installation bracket 11 is a trapezoidal frame welded by square steel and is used to install the experimental devices at each station. The side shock-absorbing rubber pad 12 is made of high-hardness rubber and is installed on the side shock-absorbing footrest 13 to prevent the vibration and deviation of the installation bracket 11 during the experiment. The base 14 is a flat steel plate and is used to install each component of the frame; the bottom shock-absorbing rubber pad 15 is made of high-hardness rubber and is fixed at the bottom of the installation bracket 11 to reduce the experimental vibration and ensure the smoothness of the experimental process.

[0028] As Figures 6 - 8 shown, the simulated door device 21 includes a door frame 211, a first mounting plate 212, a door hinge 213, a connecting plate 214, a lock body 215, and a cable 216; the door frame 211 is a square frame, and the inner end of the door frame 211 is connected to the connecting plate 214 through the door hinge 213; a pin shaft hole is provided in the middle of the connecting plate 214, and the connecting plate 214 is hinged to the installation bracket 11 of the frame 1 through a pin shaft passing through the pin shaft hole; a plurality of threaded holes for installing the inner and outer door pull rod device 22 are provided on the first mounting plate 212, and the first mounting plate 212 is installed in the middle of the door frame 211. The lock body 215 is installed in the middle of the outer end of the door frame 211, and the lock body 215 is connected to the cable 216 for controlling the opening of the lock body 215.

[0029] As Figures 9 - 11As shown, there are two sets of inner and outer door pull rod devices 22, upper and lower. The upper inner and outer door pull rod device 22 performs the action of opening the door inward, and the lower inner and outer door pull rod device 22 performs the action of opening the door outward. Each set of inner and outer door pull rod devices 22 includes a bottom plate 221, a first cylinder 222, a slider 223, a cable fixing plate 224, a limiting plate 225, and a guide rail 226. The bottom plate 221 and the first cylinder 222 are respectively fixed on the first mounting plate 212. The bottom plate 221 has an L-shaped structure. The guide rail 226 is installed on the bottom plate 221. A cable through hole 2211 is provided at the front end of the bottom plate 221, and the limiting plate 225 for limiting the cable to prevent the cable from falling out due to vibration is connected. The slider 223 is installed on the guide rail 226. One end of the slider 223 is connected to the first cylinder 222, and the other end of the slider 223 is connected to the cable fixing plate 224. The cable fixing plate 224 is connected to the cable 216. The first cylinder 222 drives the slider 223 to slide, thereby pulling the cable 216 to control the door lock to open.

[0030] consisting of Figures 12 - 16As shown, the door opening and closing assist device 23 is mainly composed of a clamping block 231, a transverse pull rod 232, a second cylinder 233, a third cylinder 234, a second mounting plate 235, a limiting ring 236, a longitudinal pull rod 237, a third mounting plate 238, a hinge seat 239, a guide sleeve 2310, and a guide rod 2311; the clamping block 231 is a concave block in half, and the clamping block 231 is connected to the door frame 211; the two ends of the transverse pull rod 232 are respectively connected to the clamping block 231; the longitudinal pull rod 237 is U-shaped, and the size of the U-shaped mouth is consistent with the diameter of the transverse pull rod 232. The open end of the longitudinal pull rod 237 is fixed on the second mounting plate 235, and the U-shaped mouth of the longitudinal pull rod 237 passes through the transverse pull rod 232 The second mounting plate 235 is a T-shaped block, which is fixed on the piston rod of the third cylinder 234; the second cylinder 233 is a small cylinder, which is fixed on the second mounting plate 235. When the piston rod of the second cylinder 233 is extended, it directly presses against the transverse rod 234. 2; the third cylinder 234 is mounted on the third mounting plate 238, and guide sleeves 2310 are installed at both ends of the third mounting plate 238. The guide rod 2311 passes through the guide sleeve 2310 and is fixed to the second mounting plate 235; the tail of the third cylinder 234 is hinged to the hinge seat 239; the hinge seat 239 is fixed to the mounting bracket 11 of the frame 1, and the cylinder diameter ratio (i.e., inner diameter ratio) of the second cylinder 233 and the third cylinder 234 is 1:(2.5-3). The reason for using dual cylinders of different sizes to drive: the third cylinder 234, which is a small cylinder, has a small cylinder body, and the compressed air can quickly fill the cylinder body, and the cylinder response is relatively fast. The second cylinder 233, which is a large cylinder, has a relatively large cylinder body, and it takes a certain amount of time for the compressed air to fill the cylinder body, and the cylinder response is relatively slow. When the large cylinder is still inflating, the small cylinder is already full. First, the car door is pushed out an angle to the limit of the extension range of the small cylinder. The large cylinder has just finished intake and starts to respond, and continues to push the car door open, thereby reducing the experimental time.

[0031] See also Figures 17 - 20, the shock absorption device 24 includes a spring 241, a first limit seat 242, a screw rod 243, a second limit seat 244, a locking nut 245, an adjusting nut 246, a bearing seat 247, a bearing 248, and a pin shaft 249; the first limit seat 242 is an L-shaped block, one end of the first limit seat 242 is fixed on the connecting plate 214 of the simulated door device 21, and a waist-shaped hole that allows the screw rod 243 to move axially is machined at the other end of the first limit seat 242; the second limit seat 244 is installed on the mounting bracket 11 of the frame 1 opposite to the first limit seat 242; the screw rod 243 is locked on the second limit seat 244 through the locking nut 245; the spring 241 is sleeved on the screw rod 243, and the compression amount of the spring is adjusted by the adjusting nut 246 threadedly connected to the screw rod 243; the bearing seat 247 is fixed on the connecting plate 214 of the simulated door device 21; the bearing 248 is installed in the bearing seat 247; the pin shaft 249 passes through the bearing 248 and the pin shaft hole in the middle of the connecting plate 214 of the simulated door device 21 and is fixed on the mounting bracket 11 of the frame 1. Only the second limit seat 244 and the pin shaft 249 of the entire shock absorption device are fixed on the frame 1, that is, the simulated door device 21 can rotate around the pin shaft 249 through the connecting plate 214. During the experiment, the entire simulated door device 21 is vertically suspended. By adjusting the compression amount of the spring through the adjusting nut 246, the door can be in a horizontal state. At the same time, when the door device vibrates during the experiment, the simulated door device 21 will also rotate around the pin shaft, and the springs at both ends will absorb energy, avoiding excessive vibration and abnormal noise of the simulated door device and extending the service life of the experimental device.

[0032] The full-lock / half-lock switching device 25 includes an upper buffer mechanism 251, an upper connecting plate 252, a lower buffer block 253, a switching plate 254, a guide rod 255, a guide sleeve 256, a switching cylinder 257, and a lower connecting plate 258 (see Figures 21 - 23); The upper buffer mechanism 251 is installed on the upper connecting plate 252, and the upper buffer mechanism 251 is connected to the door frame 211 through the door frame connecting block 259; The lower buffer block 253 is a rubber block, fixed on the switching plate 254 by a screw; The guide rod 255 is installed on the switching plate 254; The guide sleeve 256 is installed on the lower connecting plate 258, and the guide rod 255 passes through the lower connecting plate 258 and the guide sleeve 256 in sequence; The lower connecting plate 258 is connected to the mounting bracket 11 of the frame 1 through the frame connecting blocks 2510 at both ends; The switching cylinder 257 is fixed at the bottom of the lower connecting plate 258, and the piston rod of the switching cylinder 257 passes through the lower connecting plate 258 and is connected to the switching plate 254; When the switching cylinder 257 expands and contracts, the switching plate 254 can expand and contract up and down along the guide, so as to achieve the state of switching between full lock and half lock. The upper buffer mechanism 251 includes an upper buffer block 2511 and an oil buffer 2512; The upper buffer block 2511 is a rubber block, locked on the upper connecting plate 252 by bolts; The oil buffer 2512 is an oil pressure spring, installed in the middle of the upper connecting plate 252, and the buffering effects of the oil buffer 2512 and the upper buffer block 2511 can prevent excessive impact force when the door closes.

[0033] The door lock catch installation device 26 includes a limit block I 261, a longitudinal guide block 262, a longitudinal slider 263, a transverse slider 264, a lock catch 265, a lock catch mounting block 266, a limit block II 267 (see Figures 24 - 28 ); The longitudinal guide block 262 is fixed on the mounting bracket 11 on one side of the door lock end of the simulated door device 21. The upper part of the longitudinal guide block 262 is processed with a longitudinal dovetail-shaped boss 2621, and the limit blocks I 261 are respectively fixed at both ends of the longitudinal dovetail-shaped boss 2621 to prevent the longitudinal slider 263 from sliding out; The lower part of the longitudinal slider 263 is processed with a longitudinal dovetail-shaped groove 2631 that matches the longitudinal dovetail-shaped boss 2621. The upper part of the longitudinal slider 263 is processed with a transverse dovetail-shaped groove 2632, and the limit blocks II 267 are respectively fixed at both ends of the transverse dovetail-shaped groove 2632 to prevent the transverse slider 264 from sliding out. Longitudinal waist holes 2633 for adjusting the longitudinal position of the lock catch are respectively processed at the four corners of the longitudinal slider 263; The lower part of the transverse slider 264 is processed with a transverse dovetail-shaped boss 2641 that matches the transverse dovetail-shaped groove 2632, and transverse waist holes 2642 for adjusting the transverse position of the lock catch are processed on both sides of the transverse slider 264; The lock catch mounting block 266 is an L-shaped block, which is fixed on the transverse slider 264, and the lock catch 265 that matches the lock body 215 is installed on the side wall of the lock catch mounting block 266.

[0034] The guiding device 27 is installed on the upper and lower sides of the door frame 211, and includes a guiding bracket 271, a ball 272, a ball bracket 273 (see Figures 29 - 30), since the door frame 211 of the simulated door device 21 is flexibly connected to the frame 1 through a shock-absorbing device, there will be a certain swing amplitude when the door is closed. At this time, the guiding devices on the upper and lower sides of the door frame 211 are responsible for correcting the position of the door so that the lock body can cooperate with the lock catch to lock the door. The guiding bracket 271 is an L-shaped block with a chamfer, and the guiding bracket 271 is fixedly installed on the mounting brackets 11 on the upper and lower sides of the door lock end of the door frame 211; the ball 272 is a round steel ball and is fixed on the door frame 211 through a ball bracket 273. A raceway for the ball 272 to roll therein is provided in the ball bracket 273. The ball 272 rolls in the ball bracket 273, which can reduce the frictional resistance between the ball and the ball bracket when the door is closed.

[0035] The working principle of the present invention is as follows: The experimental device of the present invention is installed at all four workstations of the frame 1, and the durability of 4 door locks is verified simultaneously.

[0036] Inner door opening: The first cylinder 222 of the inner and outer pull rod device 22 of the door located above for performing inner door opening retracts, pulling the cable, and the door lock is opened; the second cylinder of the door opening and closing assistance device extends quickly, pushing the horizontal pull rod to drive the simulated door device to open a small angle. At this time, the third cylinder starts to respond, and the piston rod extends, driving the second mounting plate to extend. Since only the piston rod of the second cylinder contacts the horizontal push rod on the second mounting plate, that is, both the second cylinder and the third cylinder push the horizontal pull rod through the piston rod of the second cylinder, the second mounting plate will have uneven force; therefore, a limiting ring is designed in the middle of the horizontal pull rod to limit the longitudinal pull rod on the mounting plate in the middle of the horizontal pull rod to prevent the mechanism from pulling the door out of alignment due to uneven force; at the same time, two guide rods are designed below the second mounting plate to limit the second mounting plate to move only along the axial direction of the piston rod of the third cylinder, ensuring that the entire mechanism always moves along the central axis. The simulated door device opens clockwise along the hinge, and the door opening and closing assistance device rotates counterclockwise along the hinge seat until the door is opened in place and stops.

[0037] Start the next action, close the car door; the second cylinder retracts, and at the same time, the third cylinder drives the longitudinal pull rod to pull the transverse pull rod to close the car door. Since the car door is vertically installed on the frame, when the car door is opened and closed, affected by its own gravity, there will be a downward moment on the car door hinge, and the car door hinge used in the experiment is easily damaged, which affects the experiment. To avoid this problem, a shock-absorbing device is added at the position of the car door hinge. The entire car door experimental device is not rigidly connected to the frame, but can rotate along the pin shaft. By adjusting the compression amount of the high-strength springs at both ends, the moment of the car door gravity on the hinge is offset, ensuring that the car door is in a horizontal position and the hinge is not affected by the moment. During the experiment, the vibration of the car door will also be absorbed by the springs of the shock-absorbing device, ensuring the smoothness of the experimental process. Since the hinge end of the car door is flexibly connected to the frame, during the experiment, the distance between the door lock end and the hinge end is relatively far, and there will be a slight swing at the door lock end, resulting in the misalignment of the lock body and the lock catch, so that the door cannot be locked. Therefore, a guiding device is designed at the door lock end, and through ball guiding, it is ensured that the lock body can be aligned with the lock catch every time the car door is closed.

[0038] Switching between full lock and half lock when the car door is closed: (1) From half lock to full lock state, when the car door is closed, the switching cylinder of the full lock and half lock limit device extends, and drives the lower buffer block to rise a short distance to the half lock position through the switching plate. The switching plate is guided by two guide rods to prevent deviation from the center position when rising or falling; after the car door is almost closed, the oil buffer first contacts the switching plate to buffer the inertial force of the car door closing, and then the upper and lower buffer blocks fit together. Both the upper and lower buffer blocks are rubber blocks, which buffer the inertial force of the car door closing again to reduce vibration); at this time, it is in the half lock state, the switching cylinder retracts, the switching plate drives the lower buffer block to retract, and the car door is pulled to the full lock state under the electromagnetic force of the actuator (the actuator is not shown in the figure). (2) In the direct full lock state, when the car door is closed, the switching cylinder retracts, and the switching plate and the lower buffer block retract to the full lock position. When the car door is closed in place, first the oil buffer buffers, and then when the upper and lower buffer blocks contact to buffer and offset the inertial force, the car door is closed in place.

[0039] After one cycle of the inner door opening is completed, then to the outer door opening. The outer door opening is performed by the inner and outer pull rod device 22 of the car door located below, and other actions are the same as those of the inner door opening.

Claims

1. A door lock durability test device, characterized in that: Comprising a frame (1) and at least one simulated car door station (2) mounted on the frame (1), each simulated car door station (2) includes: A simulated car door device (21), mounted on the frame (1), for simulating a car door, with the inner end being the hinge end and the outer end being the door lock end; An inner and outer door pull rod device (22), mounted on the simulated car door device (21), for simulating opening the door through the inner and outer door handles; A door opening and closing assist device (23), with one end connected to the simulated car door device (21) and the other end fixed to the frame (1), for simulating assisting in opening and closing the door; A shock absorption device (24), mounted on the hinge end of the simulated car door device (21) and the frame (1), for absorbing the impact force generated by the collision between the simulated car door device and the frame; A full lock / half lock switching device (25), mounted on the frame (1) and the door lock end of the simulated car door device (21), for simulating controlling the locking state of the car door lock; A controller, for controlling the actions of the inner and outer door pull rod device (22), the door opening and closing assist device (23), and the full lock / half lock switching device (25).

2. The durability test device for a vehicle door lock according to claim 1, characterized in that: The simulated car door device (21) includes a door frame (211), a first mounting plate (212), a door hinge (213), a connecting plate (214), a lock body (215), and a cable (216); the door frame (211) is a square frame, and the inner end of the door frame (211) is connected to the connecting plate (214) through the door hinge (213); the middle of the connecting plate (214) is hinged to the frame (1); the first mounting plate (212) is provided with a plurality of threaded holes for mounting the inner and outer door pull rod device (22), and the first mounting plate (212) is mounted in the middle of the door frame (211), the lock body (215) is mounted in the middle of the outer end of the door frame (211), and the lock body (215) is connected with the cable (216) for controlling the opening of the lock body (215).

3. The durability test device for a car door lock according to claim 2, characterized in that: The inner and outer door pull rod device (22) includes a bottom plate (221), a first cylinder (222), a slider (223), a cable fixing plate (224), a limiting plate (225), and a guide rail (226); the bottom plate (221) and the first cylinder (222) are respectively fixed on the first mounting plate (212), the bottom plate (221) is an L-shaped structure, the guide rail (226) is mounted on the bottom plate (221), a cable through hole (2211) is provided at the front end of the bottom plate (221) and is connected with the limiting plate (225) for limiting the cable to prevent the cable from falling out due to vibration, the slider (223) is mounted on the guide rail (226), one end of the slider (223) is connected to the first cylinder (222), the other end of the slider (223) is connected to the cable fixing plate (224), and the cable fixing plate (224) is connected with the cable (216).

4. The durability test device for a vehicle door lock according to claim 2, wherein: The described door opening and closing assisting device (23) mainly consists of a clamping block (231), a transverse pull rod (232), a second cylinder (233), a third cylinder (234), a second mounting plate (235), a limiting ring (236), a longitudinal pull rod (237), a third mounting plate (238), a hinge seat (239), a guide sleeve (2310), and a guide rod (2311); the clamping block (231) is a semi-cylindrical concave block, and this clamping block (231) is connected to the door frame (211); both ends of the transverse pull rod (232) are respectively connected to the clamping block (231); the longitudinal pull rod (237) is in a U shape, the open end of this longitudinal pull rod (237) is fixed on the second mounting plate (235), and the U-shaped opening of the longitudinal pull rod (237) passes through the transverse pull rod (232) to form a cross with the transverse pull rod (232); the limiting ring (236) is fixed in the middle of the transverse pull rod (232) to prevent the longitudinal pull rod (237) from axially moving along the transverse pull rod (232); the second mounting plate (235) is fixed on the piston rod of the third cylinder (234); the second cylinder (233) is a small cylinder and is fixed on the second mounting plate (235), when the piston rod of the second cylinder (233) extends, it directly abuts against the transverse pull rod (232); the third cylinder (234) is installed on the third mounting plate (238), guide sleeves (2310) are installed at both ends of the third mounting plate (238), and the guide rod (2311) passes through the guide sleeve (2310) and is fixed on the second mounting plate (235); the tail of the third cylinder (234) is hinged to the hinge seat (239); the hinge seat (239) is fixed on the frame (1), and the cylinder diameter ratio of the second cylinder (233) to the third cylinder (234) is 1:(2.5 - 3).

5. The durability test device for a car door lock according to claim 2, characterized in that: The described shock absorption device (24) includes a spring (241), a first limiting seat (242), a screw rod (243), a second limiting seat (244), a locking nut (245), an adjusting nut (246), a bearing seat (247), a bearing (248), and a pin shaft (249); one end of the first limiting seat (242) is fixed on the connecting plate (214) of the simulated door device (21), and a waist-shaped hole that enables the screw rod (243) to axially move along it is machined at the other end of the first limiting seat (242); the second limiting seat (244) is installed on the frame (1) opposite to the first limiting seat (242); the screw rod (243) is locked on the second limiting seat (244) through the locking nut (245); the spring (241) is sleeved on the screw rod (243), and the compression amount of the spring is adjusted by the adjusting nut (246) threadedly connected to the screw rod (243); the bearing seat (247) is fixed on the connecting plate (214) of the simulated door device (21); the bearing (248) is installed in the bearing seat (247); the pin shaft (249) passes through the bearing (248) and the middle of the connecting plate (214) of the simulated door device (21) and is fixed on the frame (1).

6. The durability test device for a vehicle door lock according to claim 2, wherein: The described full-lock / semi-lock switching device (25) includes an upper buffer mechanism (251), an upper connecting plate (252), a lower buffer block (253), a switching plate (254), a guide rod (255), a guide sleeve (256), a switching cylinder (257), and a lower connecting plate (258); the upper buffer mechanism (251) is installed on the upper connecting plate (252), and this upper buffer mechanism (251) is connected to the vehicle door frame (211) through a door frame connecting block (259); the lower buffer block (253) is fixed on the switching plate (254) by a screw; the guide rod (255) is installed on the switching plate (254); the guide sleeve (256) is installed on the lower connecting plate (258), and the guide rod (255) sequentially passes through the lower connecting plate (258) and the guide sleeve (256); the lower connecting plate (258) is connected to the frame (1) through frame connecting blocks (2510) at both ends; the switching cylinder (257) is fixed to the bottom of the lower connecting plate (258), and the piston rod of the switching cylinder (257) passes through the lower connecting plate (258) and is connected to the switching plate (254).

7. The durability test device for a vehicle door lock according to claim 6, characterized in that: The described upper buffer mechanism (251) includes an upper buffer block (2511) and an oil buffer (2512); the upper buffer block (2511) is a rubber block and is locked to the upper connecting plate (252) by bolts; the oil buffer (2512) is an oil pressure spring and is installed in the middle of the upper connecting plate (252).

8. The durability test device for a vehicle door lock according to claim 2, characterized in that: This test device further includes a vehicle door lock buckle installation device (26), and this vehicle door lock buckle installation device (26) includes a limit block I (261), a longitudinal guide block (262), a longitudinal slider (263), a transverse slider (264), a lock buckle (265), a lock buckle installation block (266), and a limit block II (267); the longitudinal guide block (262) is fixed to the frame (1) on one side of the door lock end of the simulated vehicle door device (21), and a longitudinal dovetail-shaped boss (2621) is machined on the upper part of this longitudinal guide block (262), and the limit block I (261) is respectively fixed at both ends of the longitudinal dovetail-shaped boss (2621); a longitudinal dovetail-shaped groove (2631) that cooperates with the longitudinal dovetail-shaped boss (2621) is machined on the lower part of the longitudinal slider (263), a transverse dovetail-shaped groove (2632) is machined on the upper part of the longitudinal slider (263), and the limit block II (267) is respectively fixed at both ends of the transverse dovetail-shaped groove (2632), and longitudinal waist holes (2633) for adjusting the longitudinal position of the lock buckle are respectively machined at the four corners of the longitudinal slider (263); a transverse dovetail-shaped boss (2641) that cooperates with the transverse dovetail-shaped groove (2632) is machined on the lower part of the transverse slider (264), and transverse waist holes (2642) for adjusting the transverse position of the lock buckle are machined on both sides of the transverse slider (264); the lock buckle installation block (266) is an L-shaped block, this lock buckle installation block (266) is fixed to the transverse slider (264), and the lock buckle (265) that cooperates with the lock body (215) is installed on the side wall of the lock buckle installation block (266).

9. The durability test device for a vehicle door lock according to claim 2, characterized in that: The test device further includes a guiding device (27) installed at the upper and lower ends of the door frame (211). The guiding device (27) includes a guiding bracket (271), a ball (272), and a ball bracket (273). The guiding bracket (271) is an L-shaped block with chamfers, and is fixedly installed on the frame (1) on both sides of the door lock end of the door frame (211); the ball (272) is a round steel ball and is fixed on the door frame (211) through the ball bracket (273). A raceway in which the ball (272) can roll is provided in the ball bracket (273).

10. A door lock durability test device according to claim 1, characterized in that: The frame (1) includes a mounting bracket (11), a side shock-absorbing rubber pad (12), a side shock-absorbing footrest (13), a base (14), and a bottom shock-absorbing rubber pad (15); the mounting bracket (11) is a trapezoidal frame, the side shock-absorbing rubber pad (12) is a high-hardness rubber and is installed on the side shock-absorbing footrest (13), the base (14) is a flat steel plate for installing each component of the frame; the bottom shock-absorbing rubber pad (15) is a high-hardness rubber and is fixed to the bottom of the mounting bracket (11).

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