An automatic wheel chock device for preventing accidental hill rolling of a motor vehicle

Abstract

The application provides an automatic pad wheel device for preventing motor vehicle from sliding down hill, which is fixed on the corresponding position of the rear side of the wheel of the vehicle chassis, and the installation frame is provided with a pad block receiving and releasing mechanism, a pad block locking mechanism and a pad block pushing mechanism, and a trapezoidal pad block with a circular arc notch is hung below the installation frame, and one person in the driver's cabin can control the process of automatic pad wheel and pad block receiving and releasing. The automatic pad wheel device uses gear with one-way clutch mechanism to drive the pad block receiving and releasing mechanism, which has strong impact resistance and stable operation; the pad block locking mechanism is provided with locking assembly and unlocking assembly, which can prevent the pad block from falling off accidentally when the vehicle is jolted; the pad block pushing mechanism is provided with U-shaped fork, so that the operation of pushing and receiving the pad block can be accurately positioned, and since the specific connection mode is adopted between the swing arm and the pad block, the pad block will not move backward with the vehicle, and the pad wheel can be successfully ensured.

Description

Technical Field

[0001] This invention relates to a vehicle wheel support device, specifically an automatic wheel support device that prevents a vehicle from accidentally rolling down a slope when parked on a slope, belonging to the technical field of vehicle safety accessories. Background Technology

[0002] When parking a vehicle on a slope, the handbrake is used for parking. This relies on the brake pads to clamp the wheels against the brake drums or discs to achieve parking. However, this parking method is not absolutely safe and reliable. Accidents often occur due to broken mechanical parts or insufficient clamping pressure failing to lock the wheels, leading to the vehicle rolling down the slope. Therefore, when a vehicle is parked on a slope, drivers often manually insert stones or other objects under the wheels to temporarily shim them and prevent the vehicle from rolling. However, this method has many drawbacks. For example, only the driver is present, and no one can get out of the vehicle to assist with shimming, or even if someone assists, there may be no suitable objects nearby, making it impossible to shim the wheels. Furthermore, when most vehicles leave, the stones or other objects used for temporary wheel shimming are often left on the road, posing a safety hazard to subsequent vehicles.

[0003] To address the aforementioned problems, the inventors have provided an automatic wheel-supporting device for preventing accidental rollover in a motor vehicle, as described in Chinese Patent CN202121133158.8. This device allows the driver to control the automatic wheel-supporting and wheel-retraction process from within the cab after parking the vehicle. The device's mounting frame is fixedly installed on the chassis above and behind the corresponding wheel. The mounting frame houses a wheel-supporting mechanism, a wheel-supporting locking mechanism, and a wheel-supporting pushing mechanism. A wheel-support is suspended below the mounting frame. During use, the wheel-supporting locking mechanism releases the wheel-support, the wheel-supporting mechanism lowers the wheel-support, and the wheel-supporting pushing mechanism pushes the wheel-support to the gap under the wheel, thus completing the automatic wheel-supporting process. When not in use, the wheel-supporting mechanism retracts the wheel-support, and the wheel-supporting locking mechanism locks the retracted wheel-support, completing the wheel-supporting process.

[0004] However, through repeated practice, the inventors discovered that the above-mentioned technical solution still has many defects in use, mainly reflected in the following aspects: the reliability of the pad locking mechanism is insufficient, and the gripper is prone to sudden uncontrolled opening when the vehicle is bumpy, causing the pad to loosen and fall off; the impact resistance of the pad release mechanism is poor, and its operation is not stable enough; the pad pushing mechanism lacks corresponding limit switches, resulting in the pad pushing and retracting not being accurate when used on slopes of different gradients, and the connection between the pad pushing mechanism and the pad is not reasonably set, causing the pad to sometimes move backward when the vehicle moves backward, which cannot guarantee the successful padding. To this end, the inventors have made a series of improvements to the pad release mechanism, pad locking mechanism, and pad pushing mechanism in the technical solution to obtain an automatic padding device that is more stable in actual operation, more reliable, and has a better effect in use. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic wheel pad device to prevent motor vehicles from accidentally rolling down a slope, so as to replace the temporary pad that needs to be manually inserted under the wheel to prevent accidental rolling when parking on a slope.

[0006] The specific technical solution adopted in this invention is as follows: An automatic wheel support device for preventing motor vehicles from accidentally rolling downhill includes a horizontally mounted mounting frame fixedly positioned above the rear side of the wheel on the vehicle chassis. The mounting frame houses a wheel support mechanism, a wheel support locking mechanism, and a wheel support pushing mechanism. A trapezoidal wheel support with an arc-shaped notch is suspended below the mounting frame. The top and front sides of the wheel support are connected by a concave arc-shaped transition surface, forming an arc-shaped notch that matches the outer edge of the wheel. The top surface of the wheel support has two lifting lugs, and the rear side of the wheel support has a horizontally extending slot with a sealing plate having a central hole at the opening.

[0007] The pad block take-up and release mechanism is equipped with a horizontal take-up and release shaft, which is rotatably supported in the middle of the mounting frame by bearings at both ends. A take-up reel with a chain winding is fixedly installed on the shaft on both the left and right sides of the take-up and release shaft. The take-up and release ends of the two chains are respectively connected to two lifting lugs on the top surface of the pad block. A driven gear with an internal one-way clutch mechanism is also installed on the take-up and release shaft. A DC geared motor is installed on one side of the take-up and release shaft on the mounting frame. A driving gear with an internal one-way clutch mechanism is installed on the output shaft of the DC geared motor. The driving gear meshes with the driven gear, and the DC geared motor drives the take-up reel to perform one-way winding.

[0008] Furthermore, a chain take-up tongue extending to the right is fixedly connected to the right end face of the take-up and take-down shaft. If necessary, the chain take-up tongue can be clamped with a wrench to drive the take-up and take-down shaft to rotate, and the chain take-up disc can be manually controlled to wind up the chain.

[0009] Furthermore, the tooth width of the driven gear is smaller than that of the driving gear to facilitate the removal of accumulated debris at the gear meshing point.

[0010] The pad locking mechanism has a horizontal front axle and a rear axle, which are mounted within the mounting frame and located on the front and rear sides of the retraction and extension shaft, respectively. The front and rear grippers are rotatably supported on the front and rear axles by collars, respectively. The front and rear grippers form a pair of openable grippers that extend downwards from the mounting frame to grip the pad. Each front and rear gripper has two collars spaced apart, with hooks extending downwards and bending inwards at the lower part of each collar. The upper parts of the two collars are connected by a gate-shaped control handle that extends upwards and tilts outwards. Tension springs are located on the front and rear sides of the mounting frame and connected to the control handles of the front and rear grippers, keeping the hooks at the lower ends of the front and rear grippers in a closed state. When the hooks of the front and rear grippers are closed, the straight distance between the front and rear hooks is greater than the straight width of the top surface of the pad. A locking component and an unlocking component are provided between the front and rear grippers.

[0011] Furthermore, the front and rear grippers have guide wheels at their hook heads to facilitate the entry and exit of the pad blocks.

[0012] The locking assembly has a mounting plate that is horizontally and vertically fixed on the mounting frame. The mounting plate has four guide holes in its center. A push frame is located below the mounting plate, consisting of a horizontal push plate, two support studs fixedly connected to the top surface of the push plate, and a locking column. The two support studs of the push frame pass through the two guide holes on the left side of the mounting plate from below and are supported by a clamping nut above the mounting plate by a horizontally and vertically oriented claw limiting support rod. The claw limiting support rod has arc-shaped support heads at both ends corresponding to the control handles of the front and rear claws. The bottom surface of the claw limiting support rod has a downwardly extending limiting strip. A first pressure spring is sleeved on the outer side of the column between the mounting plate and the push plate by the two support studs. A sliding piece that can slide back and forth along the top surface of the mounting plate is mounted on the right side of the top surface of the mounting plate via a limiting frame. The sliding piece has front and rear openings corresponding to the two guide holes on the right side of the mounting plate. A tension spring connected to the rear end of the sliding piece and pulling the sliding piece backward is also mounted on the top surface of the mounting plate. The top of the locking column of the push frame has a conical top. The top end has a forward-facing notch. When the locking post is in the locked state, the locking post passes through the guide hole on the rear right side of the mounting plate and the rear opening of the slider from bottom to top. The front edge of the rear opening of the slider is engaged with the notch of the locking post. A second pressure spring is sleeved on the outer side of the post between the mounting plate and the push plate. The locking assembly also has an unlocking post. The lower end of the unlocking post has a lower baffle, and the upper end of the unlocking post has a conical section. An upper baffle is connected above the conical section. The unlocking post... After passing through the guide hole on the right front of the mounting plate and the front opening of the slider, the front side of the slider's front opening is engaged with the conical section of the unlocking column. Simultaneously, the upper baffle of the unlocking column engages with the top surface of the slider's front opening. A third pressure spring is sleeved on the outer side of the unlocking column between the mounting plate and the lower baffle. The top surface of the upper baffle of the unlocking column connects to the lower end of the unlocking chain. A lifting limit switch is also installed on one side of the mounting plate, with its contacts corresponding to the push plate of the push frame. When the pad block retraction mechanism lifts the pad block, causing its top surface to push the push plate of the push frame upwards to trigger the lifting limit switch, the DC geared motor stops lifting. At this time, the arc-shaped supports at both ends of the locking component's claw limit support rod are engaged with the control handles of the front and rear claws, and the locking column reaches the locked state.

[0013] Furthermore, among the four guide holes of the mounting plate, the upper ends of the two guide holes on the left are provided with upwardly extending guide sleeves, and the lower ends of the two guide holes on the right are provided with downwardly extending guide sleeves.

[0014] The unlocking assembly has a pair of levers for controlling the opening of the front and rear grippers. One end of the two levers is hinged in a V-shape by a pin, and the other end of the two levers is respectively movably looped onto the control handles of the front and rear grippers. A triangular unlocking tab is also hinged to the pin. One corner of the unlocking tab is hinged to the pin, another corner is hinged to the upper end of the unlocking chain, and another corner is connected to one end of a pull cable. The other end of the pull cable passes around the reversing pulley above the mounting frame and is connected to the puller at the far end. When the puller pulls the unlocking tab upwards via the pull cable, the unlocking tab first rotates and pulls the unlocking chain upwards, causing the unlocking column of the locking assembly to rise. The conical section of the unlocking column pushes the slide forward, unlocking the locking column. Under the action of the first pressure spring, the claw limit support rod automatically moves down to the limit bar and rests against the mounting plate, thus unlocking the locking assembly. Then, the pull cable, via the unlocking tab, lifts the pin hinged to the two pull rods. The two pull rods pull the control handles of the front and rear claws to retract, causing the hooks of the front and rear claws to open and the pad block to be released from locking.

[0015] The pad pushing mechanism is mounted on the rear axle of the pad locking mechanism. The rear axle is rotatably mounted within the mounting frame. A vertical swing arm, extending downwards and intersecting the rear axle, is fixedly connected to each side of the rear gripper. The swing arms employ a freely extendable multi-stage sleeve structure. A ball-head support rod is hinged to the end of each swing arm via a U-shaped joint. A fourth pressure spring is fitted onto the body of the ball-head support rod. The ball-head support rod, along with the fourth pressure spring, extends into a slot on the rear side of the pad. The front end of the fourth pressure spring rests against the ball head of the ball-head support rod, and the rear end rests against the sealing plate at the opening of the pad slot. An upwardly extending baffle is fixed to the side of the left swing arm on the rear axle. On the left side of the mounting frame, in front of the corresponding baffle, there is a power push rod with a pusher head extending backward. The pusher head of the power push rod pushes the baffle to swing backward, causing the rear axle to drive the end of the swing arm to swing forward, thereby pushing the pad block forward. Below the mounting frame, behind the corresponding swing arm, there is a U-shaped fork. When the swing arm swings backward to an angle perpendicular to the mounting frame, the U-shaped fork limits the swing arm. Below the mounting frame, in front of the corresponding swing arm, there is a push limit switch. The contacts of the push limit switch correspond to the swing arm. When the swing arm swings forward to trigger the push limit switch, the power push rod stops pushing and automatically retracts, thereby limiting the forward push of the pad block.

[0016] Furthermore, when the power push rod is installed, the push head is tilted upward at a certain angle, and the outer shell of the power push rod is provided with a clamp seat for fixation. The baffle is set in an arc shape at the position corresponding to the push head of the power push rod, so that the movement of the power push rod when pushing the baffle to rotate is more stable.

[0017] Furthermore, the power push rod can be an electric push rod, a pneumatic push rod, or a hydraulic power push rod.

[0018] Furthermore, the automatic wheel chock device is equipped with a wheel chock lifting control circuit and a wheel chock pushing control circuit, both powered by the vehicle's own power supply. The wheel chock lifting control circuit is connected to a DC geared motor and a lifting limit switch, and also includes a motor switch and a wheel chock lifting reset indicator light. The wheel chock pushing control circuit is connected to a power push rod and a push limit switch, and also includes a push rod switch and a push-to-position indicator light. The puller, motor switch, wheel chock lifting reset indicator light, push rod switch, and push-to-position indicator light are all located in the vehicle's driver's cab.

[0019] Furthermore, the automatic wheel pad device is provided with a protective cover around the mounting frame to prevent dirt splashed during vehicle operation from entering the mounting frame and affecting the operation of the components. An opening is provided below the protective cover for the pad block to freely enter and exit.

[0020] This automatic wheel chock device is installed on the chassis of a motor vehicle and can be carried as a spare automatic wheel chock. After the vehicle is parked on a slope, the driver can control the automatic wheel chock placement and retraction process from the cab alone. This solves the problems of needing assistance from others when placing wheels on motor vehicles and the difficulty in quickly finding suitable temporary wheel chocks. It also solves the problem of temporary wheel chocks left on the road after the vehicle leaves, which poses a traffic safety hazard to subsequent vehicles.

[0021] This automatic wheel-mounting device adds locking and unlocking components to the wheel-mounting mechanism. When the vehicle is traveling on bumps, the gripper will not suddenly open uncontrollably, causing the wheel-mount to loosen and fall off, thanks to the constraint of the gripper limit strut. The wheel-mounting mechanism uses a gear transmission with a one-way clutch, which has strong impact resistance and stable operation. A U-shaped fork is set on the wheel-mounting mechanism. Regardless of the slope, the swing arm will remain perpendicular to the slope when the wheel-mounting mechanism extends with the wheel-mounting mechanism. This ensures accurate operation of pushing and retracting the wheel-mounting mechanism. Moreover, due to the specific connection between the end of the swing arm and the wheel-mounting mechanism, when the vehicle moves backward, the ball joint of the swing arm moves backward from the groove of the wheel-mounting mechanism. The tension of the fourth pressure spring is insufficient to overcome the friction between the wheel-mounting mechanism and the ground, so the wheel-mounting mechanism remains stationary and does not move backward with the vehicle, thus ensuring the successful wheel-mounting. When the wheel-mounting mechanism is retracted and lifted off the ground, the tension of the fourth pressure spring can pull the wheel-mounting mechanism back to fit against the end of the swing arm. Therefore, this invention is an automatic wheel-shielding device that is more stable in actual operation, more reliable, and has a better effect in use. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this automatic wheel washer.

[0023] Figure 2 for Figure 1Top view (with the puller removed).

[0024] Figure 3 for Figure 1 Left view (with the puller removed).

[0025] Figure 4 for Figure 1 Right view (with the puller removed).

[0026] Figure 5 for Figure 1 A 3D diagram after rotating the front and back 180° (with the tensioner removed).

[0027] Figure 6 for Figure 5 A three-dimensional diagram showing the view from another angle after removing the locking assembly, rear axle, and swing arm.

[0028] Figure 7 This is a three-dimensional schematic diagram of the locking component.

[0029] Figure 8 This is a partial sectional view of the front view of the locking component.

[0030] Figure 9 for Figure 7 Exploded view of the locking assembly.

[0031] Figure 10 This is a three-dimensional schematic diagram of the rear axle, swing arm, and baffle of the pad pushing mechanism.

[0032] Figure 11 This is a three-dimensional schematic diagram of the pad block.

[0033] Figure 12 This is a schematic diagram showing the connection between the swing arm and the pad.

[0034] Figure 13 This is a schematic diagram of the installation of the pad pushing mechanism.

[0035] Figure 14 This is a schematic diagram of the swing arm pushing the pad to the bottom of the wheel to pad the wheel.

[0036] In the diagram: 1-Mounting frame, 2-Padded block, 3-Lifting lug, 4-Slot, 5-Sealing plate, 6-Retracting shaft, 7-Bearing, 8-Retracting chain disc, 9-Chain, 10-Driven gear, 11-DC geared motor, 12-Drive gear, 13-Retracting chain tongue, 14-Front axle, 15-Rear axle, 16-Front gripper, 17-Rear gripper, 18-Tension spring, 19-Mounting plate, 20-Push frame, 21-Push plate, 22-Support stud, 23-Locking column, 24-Gripper limit support rod, 25-First 26-Pressure spring, 27-Sliding plate, 28-Tension spring, 29-Second pressure spring, 30-Unlocking column, 31-Third pressure spring, 32-Unlocking chain, 33-Lifting limit switch, 34-Pull rod, 35-Unlocking pull plate, 36-Pull cable, 37-Reversing pulley, 38-Tethering device, 39-Swing arm, 40-Ball head support rod, 41-Fourth pressure spring, 42-Block plate, 43-Power push rod, 44-Clamp seat, 45-U-shaped fork, 46-Push limit switch, 47-Wheel. Detailed Implementation

[0037] The present invention will now be further described with reference to the accompanying drawings.

[0038] like Figure 1-14 As shown, this automatic wheel pad device has a horizontally set mounting frame 1, which is fixedly mounted on the chassis above the rear side of the wheel 46. The mounting frame 1 is equipped with a pad placement mechanism, a pad locking mechanism, and a pad pushing mechanism. A trapezoidal pad 2 with an arc notch is suspended below the mounting frame 1. The top surface and the front side of the pad 2 are connected by a concave arc transition surface, thereby forming an arc notch that matches the arc surface of the outer edge of the wheel 46. The top surface of the pad 2 is provided with two lifting lugs 3, and the rear side of the pad 2 is provided with a horizontally extending slot 4. The opening of the slot 4 is provided with a sealing plate 5 with a central hole.

[0039] The pad block take-up and take-down mechanism is equipped with a horizontal take-up and take-down shaft 6. The take-up and take-down shaft 6 is rotatably supported in the middle of the mounting frame 1 by bearings 7 at both ends. A take-up reel 8, which winds up the chain 9, is fixedly installed on the shaft body on both the left and right sides of the take-up and take-down shaft 6. The take-up and take-down ends of the two chains 9 are respectively connected to two lifting lugs 3 on the top surface of the pad block 2. A driven gear 10 with an internal one-way clutch mechanism is also installed on the take-up and take-down shaft 6. A DC geared motor 11 is installed on one side of the take-up and take-down shaft 6 in the mounting frame 1. A driving gear 12 with an internal one-way clutch mechanism is installed on the output shaft of the DC geared motor 11. The driving gear 12 meshes with the driven gear 10, and the DC geared motor 11 drives the take-up reel 8 to wind up in one direction. The tooth width of the driven gear 10 is smaller than the tooth width of the driving gear 12. A chain-retracting tongue 13 extending to the right is fixedly connected to the right end face of the take-up and release shaft 6. If necessary, the chain-retracting tongue 13 can be clamped with a wrench to drive the take-up and release shaft 6 to rotate, and the chain-retracting disc 8 can be manually controlled to wind up the chain 9.

[0040] The pad locking mechanism has a horizontally transverse front shaft 14 and a rear shaft 15, which are mounted inside the mounting frame 1 and located on the front and rear sides of the retraction shaft 6, respectively. The front gripper 16 and the rear gripper 17 are rotatably supported on the front shaft 14 and the rear shaft 15 by collars, respectively. The front gripper 16 and the rear gripper 17 form a pair of openable grippers that extend downwards from the mounting frame 1 to grip the pad 2. Both the front gripper 16 and the rear gripper 17 have two collars spaced apart from each other, and the lower parts of the two collars extend downwards and bend inwards, respectively. The hook is folded, with a guide wheel at the hook head. The upper parts of the two collars are connected by an upwardly extending and outwardly inclined gate-shaped control handle. The front and rear sides of the mounting frame 1 are respectively equipped with tension springs 18, which are connected to the control handles of the front claw 16 and the rear claw 17, so that the hooks at the lower ends of the front claw 16 and the rear claw 17 are kept in a closed state. When the hooks of the front and rear claws 16 and 17 are closed, the straight distance between the front and rear hook heads is greater than the straight width of the top surface of the pad block 2. A locking component and an unlocking component are provided between the front claw 16 and the rear claw 17.

[0041] The locking assembly has a mounting plate 19 that is horizontally and vertically fixed on the mounting frame 1. The mounting plate 19 has four guide holes in the middle. The upper ends of the two guide holes on the left side are provided with upward-extending guide sleeves, and the lower ends of the two guide holes on the right side are provided with downward-extending guide sleeves. Below the mounting plate 19 is a push frame 20, which consists of a horizontal push plate 21, two support studs 22 fixedly connected to the top surface of the push plate 21, and a locking column 23. The two support studs 22 of the push frame 20 pass through the two guide holes on the left side of the mounting plate 19 from bottom to top and are supported by a clamping nut above the mounting plate 19 with a horizontally and vertical gripper limiting support rod 24. The two ends of the gripper limiting support rod 24 are provided with arc-shaped support heads corresponding to the control handles of the front and rear grippers 16 and 17. The bottom surface of the gripper limiting support rod 24 is provided with a downward-extending limiting. Two support studs 22 are fitted with first pressure springs 25 on the outer side of the column between the mounting plate 19 and the push plate 21. A sliding plate 26, which can slide back and forth along the top surface of the mounting plate 19, is installed on the right side of the top surface via a limiting frame. The sliding plate 26 has front and rear openings corresponding to the two guide holes on the right side of the mounting plate 19. A tension spring 27, connected to the rear end of the sliding plate 26, is also mounted on the top surface of the mounting plate 19 and pulls the sliding plate 26 backward. The top of the push frame locking column 23 is a conical head with a forward-facing notch below it. When locked, the locking post 23 extends from bottom to top through the guide hole on the right rear side of the mounting plate 19 and the rear opening of the slider 26. The front edge of the rear opening of the slider 26 is engaged with the notch of the locking post 23. A second pressure spring 28 is sleeved on the outer side of the post 23 between the mounting plate 19 and the push plate 21. The locking assembly also includes an unlocking post 29. The lower end of the unlocking post 29 has a lower baffle, and the upper end of the unlocking post 29 has a conical section. An upper baffle is connected above the conical section. The unlocking post 29 extends from bottom to top through the right rear side of the mounting plate 19. After the guide hole at the front side and the front opening of the slider 26, the front side hole of the front opening of the slider 26 is engaged with the conical section of the unlocking column 29. At the same time, the upper baffle of the unlocking column 29 is engaged with the top surface of the front opening of the slider 26. A third pressure spring 30 is sleeved on the outside of the column between the mounting plate 19 and the lower baffle of the unlocking column 29. The top surface of the upper baffle of the unlocking column 29 is connected to the lower end of the unlocking chain 31. A lifting limit switch 32 is also installed on one side of the mounting plate 19. The contact of the lifting limit switch 32 corresponds to the push plate 21 of the push frame 20. When the pad block retraction mechanism lifts the pad block 2, causing the top surface of the pad block 2 to push the push plate 21 of the push frame 20 to rise to the point of triggering the lifting limit switch 32, the DC geared motor 11 stops lifting. At this time, the arc-shaped support heads at both ends of the claw limit support rod 24 of the locking assembly are just locked on the control handles of the front and rear claws 16 and 17, and the locking column 23 reaches the locked state.

[0042] The unlocking assembly has a pair of levers 33 for controlling the opening of the front and rear grippers 16 and 17. One end of the two levers 33 is hinged in a V-shape by a pin. The other end of the two levers 33 is respectively movably looped onto the control handles of the front gripper 16 and the rear gripper 17. A triangular unlocking pull plate 34 is also hinged to the pin. One corner of the unlocking pull plate 34 is hinged to the pin, another corner is hinged to the upper end of the unlocking chain 31, and another corner is connected to one end of a pull cable 35. The other end of the pull cable 35 passes around the reversing pulley 36 above the mounting frame 1 and is connected to the puller 37 at the far end. When the puller 37 pulls the unlocking tab 34 upward via the pull cable 35, the unlocking tab 34 first rotates and pulls the unlocking chain 31 upward, causing the unlocking column 29 of the locking assembly to rise. The conical section of the unlocking column 29 pushes the slide 26 forward, unlocking the locking column 23. Under the action of the first pressure spring 25, the claw limit support rod 24 automatically moves down to the limit bar and rests against the mounting plate 19, thus unlocking the locking assembly. Then, the pull cable 35, via the unlocking tab 34, lifts the pin shaft hinged to the two pull rods 33. The two pull rods 33 pull the control handles of the front claw 16 and the rear claw 17 to retract, causing the hooks of the front claw 16 and the rear claw 17 to open, and the pad block 2 to be released from locking.

[0043] The pad pushing mechanism is mounted on the rear shaft 15 of the pad locking mechanism. The rear shaft 15 is rotatably mounted in the mounting frame 1. A vertical swing arm 38, which crosses the rear shaft 15 and extends downwards, is fixedly connected to each side of the rear gripper 17 on both sides of the rear shaft 15. The swing arm 38 adopts a freely extendable multi-stage sleeve structure. A ball joint 39 is hinged to the end of the swing arm 38 via a U-shaped joint. A fourth pressure spring 40 is sleeved on the body of the ball joint 39. The ball joint 39, together with the fourth pressure spring 40, extends into the slot 4 on the rear side of the pad 2. The front end of the fourth pressure spring 40 abuts against the ball head of the ball joint 39, and the rear end abuts against the sealing plate 5 at the opening of the slot 4. An upwardly extending baffle 41 is fixedly provided on the left side of the rear shaft 15 next to the left swing arm 38. A power pusher with a push head extending backwards is installed on the left side of the mounting frame 1 in front of the corresponding baffle 41. When the push rod 42 is installed, the push head is tilted upward at a certain angle. The outer shell of the push rod 42 is fixed with a clamp seat 43. The baffle 41 is set in an arc shape at the position corresponding to the push head of the push rod 42. The push head of the push rod 42 pushes the baffle 41 to swing backward, causing the rear axle 15 to drive the end of the swing arm 38 to swing forward, thereby pushing the pad 2 forward. A U-shaped fork 44 is provided below the mounting frame 1 at the position behind the corresponding swing arm 38. When the swing arm 38 swings backward to an angle perpendicular to the mounting frame 1, the U-shaped fork 44 limits the swing arm 38. A push limit travel switch 45 is provided below the mounting frame 1 at the position in front of the corresponding swing arm 38. The contact of the push limit travel switch 45 corresponds to the swing arm 38. When the swing arm 38 swings forward to touch the push limit travel switch 45, the push rod 42 stops pushing and automatically retracts, thereby limiting the forward push of the pad 2. The power push rod 42 can be an electric push rod, a pneumatic push rod, or a hydraulic power push rod.

[0044] The automatic wheel chock device is also equipped with a wheel chock lifting control circuit and a wheel chock pushing control circuit, both powered by the vehicle's own power supply. The wheel chock lifting control circuit is connected to the DC geared motor 11 and the lifting limit switch 32, and also includes a motor switch and a wheel chock lifting reset indicator light. The wheel chock pushing control circuit is connected to the power push rod 42 and the push limit switch 45, and also includes a push rod switch and a push-to-position indicator light. The puller 37, motor switch, wheel chock lifting reset indicator light, push rod switch, and push-to-position indicator light are all located in the vehicle's driver's cab.

[0045] The automatic wheel pad device has a protective cover (not shown in the figure) around the mounting frame 1 to prevent dirt splashed during vehicle operation from entering the mounting frame 1 and affecting the operation of the parts. The bottom of the protective cover has an opening for the pad block 2 to enter and exit freely.

[0046] The working process of this automatic roller pad device is as follows: (1) The puller 37 is operated to pull the unlocking pull plate 34 upward via the pull line 35. First, the unlocking pull plate 34 rotates and pulls the unlocking chain 31 upward, causing the unlocking column 29 of the locking assembly to rise. The conical section of the unlocking column 29 pushes the slide plate 26 forward, unlocking the locking column 23. Under the action of the first pressure spring 25, the claw limit support rod 24 automatically moves down to the limit bar and rests against the mounting plate 19. The locking assembly is unlocked. Then the pull line 35 is pulled. Then, the unlocking pull tab 34 lifts the pin that hinges the two pull rods 33, and the two pull rods 33 pull the control handles of the front gripper 16 and the rear gripper 17 to retract, so that the hooks of the front gripper 16 and the rear gripper 17 open, the pad 2 is unlocked, and the pad 2, under its own weight and guided by the swing arm 38, automatically falls to the ground along with the retraction end of the chain 9. When the pad 2 falls, the one-way clutch mechanism of the driving gear 12 and the driven gear 10 are both in a non-linkage state.

[0047] (2) Operate the push rod switch to make the power push rod 42 push the baffle 41 to swing backward, so that the rear axle 15 drives the end of the swing arm 38 to swing forward, and then push the pad 2 forward, so that the pad 2 enters the position where the arc notch matches the arc surface of the bottom outer edge of the wheel 46. When the swing arm 38 swings forward to touch the push limit travel switch 45, the power push rod 42 stops pushing and automatically retracts. At the same time, the push-in indicator light is lit, indicating that the pad 2 has been pushed into place, thus completing the automatic wheel pad process.

[0048] (3) When retracting the pad 2, operate the motor switch to make the DC geared motor 11 drive the take-up and release shaft 6 to rotate. At this time, the one-way clutch mechanism of the drive gear 12 and the driven gear 10 are both in a linked state. The take-up and release shaft 6 drives the take-up chain disc 8 to wind up the chain 9. The chain 9 pulls the pad 2 out from the bottom side of the wheel 46. After the pad 2 leaves the ground, the tension of the fourth pressure spring 40 can pull the pad 2 to fit with the end of the swing arm 38. At the same time, the pad 2 also pushes the swing arm 38 to swing backward under the action of gravity. When the swing arm 38 swings backward to an angle perpendicular to the mounting frame 1, the U-shaped fork 44 limits the swing arm 38. When the pad 2 rises to the front and rear grippers 16 and 17, the upper part of the pad 2 first opens the grippers of the front and rear grippers 16 and 17 which are in a closed state. When the pad 2 is fully inserted into the hook, the front gripper 16 and the rear gripper 17 automatically engage under the action of the tension spring 18. Then, the top surface of the pad 2 pushes the push plate 21 of the push frame 20 to rise. When the push plate 21 rises to the point of triggering the lifting limit switch 32, the DC geared motor 11 stops lifting and the pad lifting reset indicator light illuminates, indicating that the pad 2 has been lifted into place, thus completing the process of retracting the pad 2. At this time, the arc-shaped support heads at both ends of the gripper limit support rod 24 of the locking assembly are precisely locked on the control handles of the front and rear grippers 16 and 17. At the same time, the locking column 23 reaches the locked state, and the gripper limit support rod 24 restricts the control handles of the front and rear grippers 16 and 17 from closing, preventing the grippers from opening uncontrollably when the vehicle is bumpy, causing the pad 2 to loosen and fall off.

Claims

1. An automatic wheel-supporting device for preventing motor vehicles from accidentally rolling downhill, characterized in that: The automatic wheel pad device has a horizontally set mounting frame, which is fixedly mounted on the chassis above the rear side of the corresponding wheel. The mounting frame is equipped with a pad placement mechanism, a pad locking mechanism, and a pad pushing mechanism. A trapezoidal pad with an arc notch is suspended below the mounting frame. The top surface and the front side of the pad are connected by a concave arc transition surface, thereby forming an arc notch that matches the arc surface of the outer edge of the wheel. The top surface of the pad is equipped with two lifting lugs, and the rear side of the pad is equipped with a horizontally extending slot. The opening of the slot is equipped with a sealing plate with a central hole. The pad block take-up and release mechanism is equipped with a horizontal take-up and release shaft, which is rotatably supported in the middle of the mounting frame by bearings at both ends. A take-up reel with a chain winding is fixedly installed on the shaft on both the left and right sides of the take-up and release shaft. The take-up and release ends of the two chains are respectively connected to two lifting lugs on the top surface of the pad block. A driven gear with an internal one-way clutch mechanism is also installed on the take-up and release shaft. A DC geared motor is installed on one side of the take-up and release shaft on the mounting frame. A driving gear with an internal one-way clutch mechanism is installed on the output shaft of the DC geared motor. The driving gear meshes with the driven gear, and the DC geared motor drives the take-up reel to perform one-way winding. The pad locking mechanism has a horizontal front axle and a rear axle, which are mounted within the mounting frame and located on the front and rear sides of the retraction and extension shaft, respectively. The front and rear grippers are rotatably supported on the front and rear axles by collars, respectively. The front and rear grippers form a pair of openable grippers that extend downwards from the mounting frame to grip the pad. Each front and rear gripper has two collars spaced apart, with hooks extending downwards and bending inwards at the lower part of each collar. The upper parts of the two collars are connected by a gate-shaped control handle that extends upwards and tilts outwards. Tension springs are located on the front and rear sides of the mounting frame and connected to the control handles of the front and rear grippers, keeping the hooks at the lower ends of the front and rear grippers in a closed state. When the hooks of the front and rear grippers are closed, the straight distance between the front and rear hooks is greater than the straight width of the top surface of the pad. A locking component and an unlocking component are provided between the front and rear grippers. The locking assembly has a mounting plate that is horizontally and vertically fixed on the mounting frame. The mounting plate has four guide holes in its center. A push frame is located below the mounting plate, consisting of a horizontal push plate, two support studs fixedly connected to the top surface of the push plate, and a locking column. The two support studs of the push frame pass through the two guide holes on the left side of the mounting plate from below and are supported by a clamping nut above the mounting plate by a horizontally and vertically oriented claw limiting support rod. The claw limiting support rod has arc-shaped support heads at both ends corresponding to the control handles of the front and rear claws. The bottom surface of the claw limiting support rod has a downwardly extending limiting strip. A first pressure spring is sleeved on the outer side of the column between the mounting plate and the push plate by the two support studs. A sliding piece that can slide back and forth along the top surface of the mounting plate is mounted on the right side of the top surface of the mounting plate via a limiting frame. The sliding piece has front and rear openings corresponding to the two guide holes on the right side of the mounting plate. A tension spring connected to the rear end of the sliding piece and pulling the sliding piece backward is also mounted on the top surface of the mounting plate. The top of the locking column of the push frame has a conical top. The top end has a forward-facing notch. When the locking post is in the locked state, the locking post passes through the guide hole on the rear right side of the mounting plate and the rear opening of the slider from bottom to top. The front edge of the rear opening of the slider is engaged with the notch of the locking post. A second pressure spring is sleeved on the outer side of the post between the mounting plate and the push plate. The locking assembly also has an unlocking post. The lower end of the unlocking post has a lower baffle, and the upper end of the unlocking post has a conical section. An upper baffle is connected above the conical section. The unlocking post... After passing through the guide hole on the right front of the mounting plate and the front opening of the slider, the front side of the front opening of the slider is engaged with the conical section of the unlocking column. At the same time, the upper baffle of the unlocking column is engaged with the top surface of the front opening of the slider. A third pressure spring is sleeved on the outside of the column body between the mounting plate and the lower baffle of the unlocking column. The top surface of the upper baffle of the unlocking column is connected to the lower end of the unlocking chain. A lifting limit switch is also installed on one side of the mounting plate. The contact of the lifting limit switch corresponds to the push plate of the push frame. The unlocking assembly is equipped with a pair of levers for controlling the opening of the front and rear grippers. One end of the two levers is hinged in a V-shape by a pin, and the other end of the two levers is respectively movably looped on the control handles of the front and rear grippers. A triangular unlocking pull plate is also hinged to the pin. One corner of the unlocking pull plate is hinged to the pin, the other corner is hinged to the upper end of the unlocking chain, and the other corner is connected to one end of a pull line. The other end of the pull line passes around the reversing pulley above the mounting frame and is connected to the puller at the far end. The pad pushing mechanism is mounted on the rear axle of the pad locking mechanism. The rear axle is rotatably mounted within the mounting frame. A vertical swing arm, extending downwards and intersecting the rear axle, is fixedly connected to each side of the rear gripper. The swing arms employ a freely extendable multi-stage sleeve structure. A ball-head support rod is hinged to the end of each swing arm via a U-shaped joint. A fourth pressure spring is fitted onto the body of the ball-head support rod. The ball-head support rod, along with the fourth pressure spring, extends into a slot on the rear side of the pad. The front end of the fourth pressure spring rests against the ball head of the ball-head support rod, and the rear end rests against the sealing plate at the opening of the pad slot. An upwardly extending baffle is fixed to the side of the left swing arm on the rear axle. On the left side of the mounting frame, in front of the corresponding baffle, there is a power push rod with a pusher head extending backward. The pusher head of the power push rod pushes the baffle to swing backward, causing the rear axle to drive the end of the swing arm to swing forward, thereby pushing the pad block forward. Below the mounting frame, behind the corresponding swing arm, there is a U-shaped fork. When the swing arm swings backward to an angle perpendicular to the mounting frame, the U-shaped fork limits the swing arm. Below the mounting frame, in front of the corresponding swing arm, there is a push limit switch. The contacts of the push limit switch correspond to the swing arm. When the swing arm swings forward to trigger the push limit switch, the power push rod stops pushing and automatically retracts, thereby limiting the forward push of the pad block.

2. The automatic wheel-supporting device for preventing motor vehicles from accidentally rolling downhill according to claim 1, characterized in that: A chain-retracting tongue extending to the right is fixedly connected to the right end face of the retracting shaft.

3. The automatic wheel-supporting device for preventing motor vehicles from accidentally rolling downhill according to claim 1, characterized in that: The tooth width of the driven gear is smaller than that of the driving gear.

4. The automatic wheel-cushioning device for preventing motor vehicles from accidentally rolling downhill according to claim 1, characterized in that: The front and rear grippers have guide wheels at their hook heads.

5. The automatic wheel-supporting device for preventing motor vehicles from accidentally rolling downhill according to claim 1, characterized in that: Of the four guide holes in the mounting plate, the upper ends of the two guide holes on the left are provided with upward-extending guide sleeves, and the lower ends of the two guide holes on the right are provided with downward-extending guide sleeves.

6. The automatic wheel-supporting device for preventing motor vehicles from accidentally rolling downhill according to claim 1, characterized in that: When the power push rod is installed, the push head is tilted upward at a certain angle, and the outer shell of the power push rod is provided with a clamp seat for fixation. The baffle is set in an arc shape at the position corresponding to the push head of the power push rod.

7. The automatic wheel-supporting device for preventing motor vehicles from accidentally rolling downhill according to claim 1, characterized in that: The power push rod can be an electric push rod, a pneumatic push rod, or a hydraulic power push rod.

8. The automatic wheel-supporting device for preventing motor vehicles from accidentally rolling downhill according to claim 1, characterized in that: The automatic wheel pad device is equipped with a pad lifting control circuit and a pad pushing control circuit, which are powered by the vehicle's own power supply. The pad lifting control circuit is connected to a DC geared motor and a lifting limit switch, and also has a motor switch and a pad lifting reset indicator light. The pad pushing control circuit is connected to a power push rod and a push limit switch, and also has a push rod switch and a push-in indicator light.

9. The automatic wheel-supporting device for preventing motor vehicles from accidentally rolling downhill according to claim 8, characterized in that: The traction device, motor switch, pad lifting and reset indicator light, push rod switch, and push-in indicator light are all located in the driver's cab of the motor vehicle.

10. The automatic wheel-supporting device for preventing motor vehicles from accidentally rolling downhill according to claim 1, characterized in that: The automatic wheel pad device has an outer enclosure around the mounting frame, and an opening is provided below the outer enclosure for the pad blocks to freely enter and exit.

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