CN112878824A

CN112878824A - Durability stopper used on vehicle

Info

Publication number: CN112878824A
Application number: CN202110254338.XA
Authority: CN
Inventors: 李永建; 李水兰; 李宇钢
Original assignee: Hangzhou Fuyang Xinyuan New Energy Co Ltd
Current assignee: Hangzhou Fuyang Xinyuan New Energy Co Ltd
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2021-06-01
Also published as: CN112922471A; CN110863723B; CN110863723A

Abstract

The invention belongs to the technical field of vehicle door limiters, and particularly relates to a durable limiter used on a vehicle. When the lower roller passes through the limiting plane, the limiting plate can bear the redundant compression elastic force of the upper compression spring relative to the lower compression spring, and meanwhile, the first gear continues to be kept static. The limiting plate ensures that the compression amount of the upper compression spring is higher than that of the lower compression spring on one hand, and meets the technical requirements of different working states of the upper and lower compression springs; on the other hand when spacing box did not cooperate with spacing arch, the limiting plate was kept away from downwards to the small circle of upside mounting panel under the power balance effect after upside compression spring elasticity weakened, realized that the second rack wears out spacing box, guaranteed follow-up adjustment process normal operating.

Description

Durability stopper used on vehicle

Technical Field

The invention belongs to the technical field of door limiters, and particularly relates to a durable limiter used on a vehicle.

Background

At present, when the vehicle is manufactured, a vehicle door limiter, a rubber spring type limiter and a torsion spring type limiter are installed on a vehicle door, and the vehicle door limiter generally has the functions of the following two aspects: the automobile door limiting device is characterized in that 2-3 arc-shaped belts are arranged on a limiting stopper arm rod, so that a switch gear is formed at a node of each arc-shaped belt and the corresponding arc-shaped belt, and 2-3 positioning points are arranged on an automobile door in the opening and closing process; secondly, the automobile door can be guaranteed to stop at a certain position when the automobile is on a specified ramp, and the automobile door can not be opened and closed automatically; . The structure has the advantages of simple structure, low cost, small occupied space and no maintenance. The defect is that the requirement on the metal plate is higher, if the strength of the hinge is not enough, the vehicle door sinks, abnormal sound is likely to be generated, and after the vehicle door runs for a period of time, the limiting torque is reduced quickly.

For the rubber spring type limiter, the door limiter with the structure generally has two gears or three gears, the maximum moment of the door limiter is about 35N.m, the length of the door limiter is about 60mm, the maximum opening angle is below 70 degrees, and after a durability test, the torque change is about 30-40%; however, the loss of the limiting force is large, and after the automobile limiting device is used for a long time, the elastic force of the spring or the rubber is weakened, so that the integral service performance of the automobile is affected. The invention reduces the influence on the normal use of the vehicle caused by the weakening of the elastic force of the spring or the rubber after long-time use by adjusting the size of the deformable amount of the spring.

The present invention is directed to a durability stop for use on a vehicle that solves the above problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a durability limiter used on a vehicle, which is realized by adopting the following technical scheme.

A durability limiter used on a vehicle comprises a mounting bracket fixed on a vehicle body, a limiting box fixed on a vehicle door, a rubber buffer block providing buffering force, a limiting arm and a clamping mechanism, wherein the upper end surface and the lower end surface of the limiting arm are respectively provided with two limiting bulges distributed along the length direction of the limiting arm; the limiting arm penetrates through the limiting box to be matched with a clamping mechanism arranged in the limiting shell; the method is characterized in that: the lower ends of two limiting bulges positioned on the lower end surface of the limiting arm in the four limiting bulges arranged on the limiting arm are respectively provided with a limiting plane.

The door stopper designed by the invention is a spring type stopper, and the conventional spring type stopper ensures that the limiting box can move along the limiting arm when the door is opened. Because the limit arm is provided with structures with different heights, the compression spring has different elastic deformations, so that people need to close the door with different forces when opening the door. The vehicle door can be limited at each limit position point. The rubber buffer block has a buffer effect on the vehicle door.

The clamping mechanism comprises a roller, mounting plates, mounting frames, compression springs, a limiting plate, a guide rail shell, a sliding block, a second gear, a first rack, a second rack, a trigger plate and a brake mechanism, wherein the two mounting plates are arranged in the limiting box in a vertically sliding fit mode, the roller is arranged on the mounting frames in a rotating fit mode, and the two mounting frames are respectively arranged on the two mounting plates in a one-to-one correspondence mode through the two compression springs; the two rollers are in rolling fit with the limiting arm; a first rack and a second rack are further installed in the limiting box through up-down sliding fit, and one end of the first rack is connected with the mounting plate on the upper side through a connecting block; the second rack is connected with the mounting plate on the lower side through the transmission of a second gear and a third rack; the guide rail shell is arranged in the limiting box, the sliding block is arranged in the guide rail shell in a sliding fit manner, and the sliding block and the guide rail shell are in one-way sliding fit; the first gear is arranged on the sliding block in a rotating fit manner, and is respectively meshed with the first rack and the second rack, and the first rack and the second rack are positioned at two sides of the circle center of the first gear; a braking mechanism which plays a braking role in the rotation between the first gear and the sliding block is also arranged in the limiting box; the limiting arm is provided with a trigger plate which controls the brake mechanism to brake or not; the side surface of one end of the limiting arm, which is provided with the rubber buffer block, is also provided with an extrusion block which plays an extrusion role on the first rack and the second rack; the limiting plate is installed on the sliding block through a connecting plate, and the limiting plate is in contact fit with the mounting plate on the upper side.

When the door is opened, the upper roller and the lower roller slide relative to the limiting arm, when the upper roller and the lower roller are in contact fit with the area of the limiting arm without the limiting bulge, the upper roller and the lower roller are tightly pressed on the limiting arm under the pre-pressure of the two compression springs, and when the upper roller and the lower roller are in contact fit with the limiting bulge on the limiting arm, the limiting bulge can extrude the upper roller and the lower roller, so that the upper roller and the lower roller further extrude the compression springs, and the resistance for opening the door is relatively increased. After the upper and lower rollers roll between the two limiting protrusions, if the upper and lower rollers want to roll continuously, the extrusion force applied to the two rollers by the limiting protrusions needs to be overcome, so that a switch gear is formed at the joint of the two limiting protrusions through the two groups of limiting protrusions, and the vehicle door has positioning points in the opening and closing process.

As a further improvement of the technology, the second gear is rotatably installed in the limiting box, the third rack is connected with the mounting plate on the upper side through a connecting block, and the second gear is respectively meshed with the third rack and the second rack.

The limiting box is provided with an insertion hole for the limiting arm to pass through, and the upper end surface of the limiting box is provided with two adjusting holes for the first rack and the second rack to pass through.

As a further improvement of the technology, the front end surface of the guide rail shell is provided with a first through square opening, one side surface in the guide rail shell is provided with a second square opening, and the other side surface in the guide rail shell is provided with a third square opening.

When the compression spring is not invalid or the elastic performance is not weakened, when people open the vehicle door, the upper roller and the lower roller slide relative to the limiting arm, when the upper roller and the lower roller are in contact fit with the limiting arm without a limiting convex area, the upper mounting plate has an upward moving trend due to the fact that the upper compression spring is in a pre-pressing state, the first rack has an upward moving trend through the corresponding connecting block, and the first gear has a rotating trend; because the lower compression spring is in a pre-pressing state, the lower mounting plate has the tendency of moving downwards; the mounting plate on the lower side enables the third rack to have a downward moving trend through the corresponding connecting block, the third rack enables the second rack to have a upward penetrating trend through adjustment on the limiting box through transmission of the second gear, so that the second gear has a rotating trend, the rotating direction of the second gear driven by the second rack is opposite to the rotating direction of the second gear driven by the first rack, and the elastic strength of the upper compression spring and the lower compression spring is equal, so that the second gear is in a static state in the state; the compression amount of the two compression springs is equal, namely the pressure applied to the limiting arm by the upper roller and the lower roller is equal.

When the upper and lower rollers are in contact fit with the limiting protrusions on the limiting arm, the limiting protrusions can extrude the upper and lower rollers, the upper roller is pressed to move upwards to extrude the compression spring on the upper side, and the lower roller is pressed to move upwards to extrude the compression spring on the lower side; when the lower roller wheel and the limiting plane of the limiting bulge at the lower side of the limiting arm start to contact and match, the lower roller wheel stops being pressed and moves downwards, the compression amount of the compression spring at the lower side is constant, and the lower mounting plate is in a static state; however, since the stopper plate is in contact engagement with the mounting plate on the upper side, the upper mounting plate is also in a stationary state in this case, and the second gear is still in a stationary state in this state; but the resistance to door opening is relatively high. After the upper and lower rollers roll between the two limiting protrusions, if the upper and lower rollers want to roll continuously, the extrusion force applied to the two rollers by the limiting protrusions needs to be overcome, so that a switch gear is formed at the joint of the two limiting protrusions through the two groups of limiting protrusions, and the vehicle door has positioning points in the opening and closing process.

The braking mechanism comprises an installation rotating shaft, a conical friction block, a rolling ball and a lever, wherein a conical groove is formed in one end of a sliding block, the conical friction block is installed at one end of the installation rotating shaft, the rolling ball is installed on the conical friction block in a rolling mode, the installation rotating shaft is installed on the sliding block in a rotating fit mode, one end, provided with the conical friction block, of the installation rotating shaft penetrates through a third square opening in the guide rail shell and is located on the outer side of the guide rail shell, the conical friction block is in friction fit with the conical groove in the sliding block, and the other end of the installation rotating shaft penetrates through a second square; the lever is installed in the limiting box in a swinging mode, and one end of the lever is matched with one end, provided with the conical friction block, of the installation rotating shaft.

The first gear is fixedly arranged at one end of the mounting rotating shaft, which is not provided with the limiting disc, and the first rack and the second rack are respectively positioned at two sides of the first gear; one end of the connecting plate penetrates through a first square opening formed in the guide rail shell and is fixedly connected with the sliding block; the other end of the connecting plate is fixedly connected with the limiting plate.

The side surface of one end of the limiting arm, which is provided with the rubber buffer block, is provided with a trigger plate for extruding and mounting the rotating shaft.

According to the trigger plate designed by the invention, in the process that the limiting box moves relative to the limiting arm, before the limiting box is contacted with the rubber buffer block, the trigger plate is firstly contacted with the lever, so that the lever swings, the lever swings to extrude the mounting rotating shaft, the conical friction block on the mounting rotating shaft is in friction limiting with the conical groove on the sliding block, and the first gear is in limited rotation; the ball is used for reducing the frictional resistance between the mounting rotating shaft and the lever when the sliding block moves downwards.

As a further improvement of the technology, a fourth rack is fixedly arranged on one side of the sliding block through a connecting block, and the connecting block penetrates through a first square opening formed in the lower end face of the guide rail shell; one end of the supporting shaft is fixedly arranged in the limiting box, the third gear is arranged on the supporting shaft through the one-way clutch, and the third gear is meshed with the fourth rack. The movement of the sliding block is made to be one-way sliding through the one-way clutch.

As a further improvement of the technology, two telescopic rods are respectively arranged between the two mounting plates and the corresponding mounting frames, and the two telescopic rods are respectively nested in the two corresponding compression springs; the mounting plate and the corresponding roller are guided by the telescopic rods.

Compared with the traditional vehicle door limiter technology, the vehicle door limiter has the following beneficial effects:

1. according to the designed vehicle door limiter, the limiting planes of the upper limiting bulges and the lower limiting bulges of the limiting arm are designed, so that the working states of the upper compression spring and the lower compression spring of the limiter are different in the working process, the time for the failure and weakening of the compression springs is different, the elastic force of the compression spring with slow failure is matched with the adjusting mechanism, the pre-compression amount of the upper compression spring and the lower compression spring is increased through the extrusion of the extrusion block on the second rack, and the reduction degree of the resistance torque of the limiter after long-time working is weakened.

2. In order to ensure that the upper compression spring and the lower compression spring are different in working state, the invention designs a limiting plane of the limiting bulge at the lower side of the limiting arm. When the limiting plate is not designed, when the lower side roller passes through the limiting plane, the first gear rotates under the action of force balance, the compression amounts of the upper and lower compression springs are kept consistent, and the working states of the upper and lower compression springs are the same. When the limiting plate structure is considered, when the lower roller passes through the limiting plane, the limiting plate can bear the redundant compression elastic force of the upper compression spring relative to the lower compression spring, and meanwhile, the first gear continues to be kept static. The limiting plate ensures that the compression amount of the upper compression spring is higher than that of the lower compression spring on one hand, and meets the technical requirements of different working states of the upper and lower compression springs; on the other hand when spacing box did not cooperate with spacing arch, the limiting plate was kept away from downwards to the small circle of upside mounting panel under the power balance effect after upside compression spring elasticity weakened, realized that the second rack wears out spacing box, guaranteed follow-up adjustment process normal operating.

3. According to the door stopper designed by the invention, the motion directions of the sliding block, the first rack, the second rack and the mounting plate are the same, the structural transmission is simple, the additional structure is not needed to be added, the transmission direction is not changed, the layout is reasonable, the fault rate is low, and the cost is low.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is a schematic structural view of the limiting arm.

Fig. 3 is a schematic view of the internal structure of the limiting shell.

Fig. 4 is a schematic structural view of the limiting shell.

Fig. 5 is a schematic view of the clamping mechanism distribution.

Fig. 6 is a schematic view of a roller installation.

Fig. 7 is a schematic view of the adjustment mechanism.

Fig. 8 is a schematic view of a slider installation.

Fig. 9 is a schematic view of a rail housing structure.

Fig. 10 is a schematic view of the clamping mechanism installation.

Number designation in the figures: 1. a rubber buffer block; 2. a limiting arm; 3. a limiting box; 4. mounting a bracket; 5. mounting a plate; 6. a limiting bulge; 7. a limiting plane; 8. a trigger plate; 9. extruding the block; 11. a clamping mechanism; 13. an insertion opening; 14. an adjustment port; 15. a limiting plate; 16. a brake mechanism; 18. connecting blocks; 20. a first rack; 22. a first gear; 23. a second rack; 24. a third rack; 26. a telescopic rod; 27. a second gear; 28. a compression spring; 29. a roller; 30. a mounting frame; 31. a connecting plate; 34. a guide rail housing; 35. a slider; 37. a lever; 38. a support shaft; 39. a third gear; 40. a one-way clutch; 41. a fourth rack; 42. connecting the squares; 44. installing a rotating shaft; 46. rolling a ball; 47. a tapered groove; 48. a first square port; 49. a second square mouth; 50. a third square mouth; 51. and a conical friction block.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1, the vehicle body buffer device comprises a mounting bracket 4 fixed on a vehicle body, a limit box 3 fixed on a vehicle door, a rubber buffer block 1 providing buffer force, a limit arm 2 and a clamping mechanism 11, wherein as shown in fig. 2, the upper end face and the lower end face of the limit arm 2 are respectively provided with two limit bulges 6 distributed along the length direction of the limit arm 2, one end of the limit arm 2 is mounted on the mounting bracket 4 in a hinged manner, and the rubber buffer block 1 is mounted at the other end of the limit arm 2 and is limited by a pin shaft mounted on the limit arm 2; the limiting arm 2 penetrates through the limiting box 3 to be matched with a clamping mechanism 11 arranged in the limiting shell; the method is characterized in that: the lower ends of two limiting bulges 6 positioned on the lower end surface of the limiting arm 2 in the four limiting bulges 6 arranged on the limiting arm 2 are respectively provided with a limiting plane 7.

The door stopper designed by the invention is a spring type stopper, and the conventional spring type stopper ensures that the limiting box 3 moves along the limiting arm 2 when the door is opened. Because the position limiting arm 2 is provided with structures with different heights, the compression spring 28 can elastically deform differently, so that people need to close the door with different forces when opening the door. The vehicle door can be limited at each limit position point. The rubber buffer block 1 has a buffering effect on the vehicle door.

As shown in fig. 3 and 5, the clamping mechanism 11 includes a roller 29, mounting plates 5, mounting frames 30, compression springs 28, a limiting plate 15, a rail shell 34, a slider 35, a second gear 27, a first rack 20, a second rack 23, a trigger plate 8, and a braking mechanism 16, wherein as shown in fig. 3 and 10, the two mounting plates 5 are mounted in the limiting box 3 through up-down sliding fit, the roller 29 is mounted on the mounting frame 30 through rotating fit, as shown in fig. 5 and 6, the two mounting frames 30 are respectively mounted on the two mounting plates 5 through the two compression springs 28 in a one-to-one correspondence manner; the two rollers 29 are in rolling fit with the limiting arm 2; a first rack 20 and a second rack 23 are further mounted in the limiting box 3 through up-down sliding fit, and one end of the first rack 20 is connected with the mounting plate 5 on the upper side through a connecting block 18; the second rack 23 is connected with the lower mounting plate 5 through the transmission of a second gear 27 and a third rack 24; the guide rail shell 34 is installed in the limiting box 3, as shown in fig. 7, the sliding block 35 is installed in the guide rail shell 34 through sliding fit, and the sliding block 35 is in one-way sliding fit with the guide rail shell 34; the first gear 22 is installed on the sliding block 35 in a rotating fit manner, the first gear 22 is respectively meshed with the first rack 20 and the second rack 23, and the first rack 20 and the second rack 23 are positioned on two sides of the circle center of the first gear 22; a braking mechanism 16 which plays a braking role in the rotation between the first gear 22 and the sliding block 35 is also arranged in the limiting box 3; the limiting arm 2 is provided with a trigger plate 8, and the trigger plate 8 controls the brake mechanism 16 to brake or not; spacing arm 2 installs the side of 1 one end of rubber buffer block and still installs the extrusion piece 9 that plays the extrusion to first rack 20 and second rack 23, as shown in fig. 7, limiting plate 15 passes through connecting plate 31 to be installed on slider 35, limiting plate 15 contacts the cooperation with the mounting panel 5 of upside.

When the door is opened, the upper roller 29 and the lower roller 29 slide relative to the limiting arm 2, when the upper roller 29 and the lower roller 29 are in contact fit with the area of the limiting arm 2 without the limiting bulge 6, the upper roller 29 and the lower roller 29 are tightly pressed on the limiting arm 2 under the pre-pressure of the two compression springs 28, and when the upper roller 29 and the lower roller 29 are in contact fit with the limiting bulge 6 on the limiting arm 2, the limiting bulge 6 can press the upper roller 29 and the lower roller 29, so that the upper roller 29 and the lower roller 29 further press the compression springs 28, and the resistance of the door to be opened is relatively increased. After the upper and lower rollers 29 roll between the two limiting protrusions 6, if the upper and lower rollers 29 want to roll continuously, the pressing force applied to the two rollers 29 by the limiting protrusions 6 needs to be overcome, so that a switch gear is formed at the joint of the two limiting protrusions 6 by the two sets of limiting protrusions 6, and the vehicle door has a positioning point in the opening and closing process.

As shown in fig. 6, the second gear 27 is rotatably installed in the stopper case 3, the third rack 24 is connected to the upper mounting plate 5 through a connecting block 18, and the second gear 27 is engaged with the third rack 24 and the second rack 23, respectively.

As shown in fig. 4, the stopper case 3 is provided with an insertion hole 13 through which the stopper arm 2 passes, and the upper end surface of the stopper case 3 is provided with two adjustment holes 14 through which the first rack 20 and the second rack 23 pass.

As shown in fig. 9, a first square opening 48 is formed on the front end surface of the rail housing 34, a second square opening 49 is formed on one side surface of the inside of the rail housing 34, and a third square opening 50 is formed on the other side surface of the inside of the rail housing 34.

As shown in fig. 8 and 9, the braking mechanism 16 includes a mounting shaft 44, a tapered friction block 51, a rolling ball 46, and a lever 37, wherein one end of the slider 35 is provided with a tapered groove 47, one end of the mounting shaft 44 is provided with the tapered friction block 51, the tapered friction block 51 is provided with the rolling ball 46 in a rolling manner, the mounting shaft 44 is mounted on the slider 35 through a rotating fit, one end of the mounting shaft 44 provided with the tapered friction block 51 passes through a third square opening 50 on the guide rail housing 34 and is located outside the guide rail housing 34, the tapered friction block 51 is in a friction fit with the tapered groove 47 on the slider 35, and the other end of the mounting shaft 44 passes through a second square opening 49 on the guide rail housing 34 and is located outside the guide; the lever 37 is installed in the limit box 3 in a swinging mode, and one end of the lever 37 is matched with one end, provided with the conical friction block 51, of the installation rotating shaft 44.

The first gear 22 is fixedly installed at one end of the installation rotating shaft 44, which is not provided with the limiting disc, and the first rack 20 and the second rack 23 are respectively positioned at two sides of the first gear 22; one end of the connecting plate 31 passes through a first square opening 48 formed on the guide rail shell 34 and is fixedly connected with the sliding block 35; the other end of the connecting plate 31 is fixedly connected with the limiting plate 15.

As shown in fig. 2, the side surface of the limiting arm 2, which is provided with one end of the rubber buffer block 1, is provided with a trigger plate 8, which is provided with a rotating shaft 44 in a pressing manner.

In the process that the limiting box 3 moves relative to the limiting arm 2, before the limiting box 3 contacts the rubber buffer block 1, the triggering plate 8 firstly contacts the lever 37, so that the lever 37 swings, the lever 37 swings to extrude the mounting rotating shaft 44, the conical friction block 51 on the mounting rotating shaft 44 and the conical groove 47 on the sliding block 35 are in friction limiting, and the first gear 22 is in limiting rotation; the balls function to reduce the frictional resistance between the mounting shaft 44 and the lever 37 when the slider 35 moves downward.

A fourth rack 41 is fixedly arranged on one side of the sliding block 35 through a connecting block 42, and the connecting block 42 penetrates through a first square opening 48 formed in the lower end face of the guide rail shell 34; one end of the supporting shaft 38 is fixedly installed in the spacing box 3, the third gear is installed on the supporting shaft 38 through the one-way clutch 40, and the third gear 39 is engaged with the fourth rack 41. The movement of the slider 35 is made to be one-way slip by the one-way clutch 40.

As shown in fig. 6, two telescopic rods 26 are respectively installed between two of the mounting plates 5 and the corresponding mounting frame 30, and the two telescopic rods 26 are respectively nested in the two corresponding compression springs 28; the mounting plate 5 and the corresponding roller 29 are guided by the telescopic rod 26.

The specific working process is as follows: when the stopper designed by the invention is used, when the compression spring 28 does not fail or the elastic performance is not weakened, when people open the vehicle door, the upper and lower rollers 29 slide relative to the limiting arm 2, and when the upper and lower rollers 29 are in contact fit with the area of the limiting arm 2 without the limiting protrusion 6, the upper mounting plate 5 has the tendency of moving upwards due to the fact that the upper compression spring 28 is in a pre-pressing state, the upper mounting plate 5 enables the first rack 20 to have the tendency of moving upwards through the corresponding connecting block 18, and further the first gear 22 has the tendency of rotating; the lower side compression spring 28 is in a pre-pressing state, so that the lower side mounting plate 5 has a downward moving tendency; the mounting plate 5 on the lower side enables the third rack 24 to have a downward moving trend through the corresponding connecting block 18, the third rack 24 enables the second rack 23 to have a upward penetrating trend through the adjustment opened on the limiting box 3 through the transmission of the second gear 27, and further enables the second gear 27 to have a rotating trend, the direction of the second rack 23 driving the second gear 27 to rotate is opposite to the direction of the first rack 20 driving the second gear 27 to rotate, and the elastic strength of the upper compression spring 28 and the lower compression spring 28 is equal, so that the second gear 27 is in a static state in the state; the two compression springs 28 are compressed by the same amount, i.e., the pressure applied to the check arm 2 by the upper and lower rollers 29 is equal.

When the upper and lower rollers 29 are in contact fit with the limiting protrusion 6 on the limiting arm 2, the limiting protrusion 6 can extrude the upper and lower rollers 29, the upper roller 29 is pressed to move upwards to extrude the upper compression spring 28, and the lower roller 29 is pressed to move upwards to extrude the lower compression spring 28; when the lower roller 29 is in contact fit with the limiting plane 7 of the limiting bulge 6 on the lower side of the limiting arm 2, the lower roller 29 stops being pressed and moves downwards, the compression amount of the compression spring 28 on the lower side is constant, the lower mounting plate 5 is in a static state, but in the state, the roller 29 on the upper side is continuously pressed by the limiting bulge 6 on the upper side and moves upwards, and the compression spring 28 on the upper side is continuously compressed; however, since the stopper plate 15 is in contact engagement with the mounting plate 5 located on the upper side, the upper mounting plate 5 is also in a stationary state in this case, and the second gear 27 is still in a stationary state in this state; but the resistance to door opening is relatively high. After the upper and lower rollers 29 roll between the two limiting protrusions 6, if the upper and lower rollers 29 want to roll continuously, the pressing force applied to the two rollers 29 by the limiting protrusions 6 needs to be overcome, so that a switch gear is formed at the joint of the two limiting protrusions 6 by the two sets of limiting protrusions 6, and the vehicle door has a positioning point in the opening and closing process.

In the working process of the invention, because the upper compression spring 28 is pressed and deformed to a greater degree relative to the lower compression spring 28, the upper compression spring 28 is easy to damage and weaken relative to the lower compression spring 28, namely the elastic coefficient of the upper compression spring 28 is reduced due to damage; the service life and the performance of the upper side compression spring 28 designed by the invention are the same as those of the compression spring 28 used in the traditional limiter; therefore, after the structure designed by the invention is added, the high-resistance torque endurance life of the limiter is longer than that of the traditional limiter; the elasticity of the compression spring 28 is weakened into a slow change process, for the convenience of description, the invention takes the example that the elasticity coefficient of the upper compression spring 28 is suddenly reduced, and the adjustment range is small in actual change.

When the elastic property of the compression springs 28 is weakened, the pressure applied to the spacing arm 2 by the two compression springs 28 through the corresponding rollers 29 is deviated, after the elastic property of the upper compression spring 28 is weakened, the pushing force applied to the upper mounting plate 5 by the upper compression spring 28 is smaller than the pushing force applied to the lower mounting plate 5 by the lower compression spring 28, in this case, the driving force of the second rack 23 to the first gear 22 is larger than the driving force of the first rack 20 to the first gear 22, the first gear 22 rotates until the driving force of the second rack 23 to the first gear 22 is the same as the driving force of the first rack 20 to the first gear 22, at this time, the compression amounts of the upper and lower compression springs 28 are different, after the driving forces are balanced, the second rack 23 moves to the outside of the spacing box 3 relative to the first rack 20, and in this state, when the spacing box 3 moves to contact with the rubber buffer block 1, the pressing block 9 mounted on the spacing arm 2 will push the second rack 23 to move inwards relative to the spacing box 3, and in this state, since the lever 37 has already locked the mounting rotating shaft 44 relative to the sliding block 35, the second rack 23 will move to drive the sliding block 35 to slide in the guide rail shell 34 through the first gear 22; meanwhile, the sliding of the sliding block 35 drives the first gear 22 to move, the first gear 22 drives the first rack 20 to move, the first rack 20 drives the mounting plate 5 located on the upper side to move downwards through transmission, the sliding block 35 drives the connecting plate 31 to move, the connecting plate 31 moves to drive the limiting plate 15 to move downwards, namely, the mounting plate 5 and the limiting plate 15 located on the upper side simultaneously move downwards, and the compression amount of the upper compression spring 28 is increased; after the extrusion block 9 and the limiting box 3 are separated, the sliding block 35 can not reset because the sliding block 35 slides in a single direction, so that the upper mounting plate 5 and the lower mounting plate 5 are both closer to the roller 29 under the action of the sliding block 35 and the first gear 22, and the upper compression spring 28 and the lower compression spring 28 keep force balance under the action of the first gear 22. When the limiting box 3 is at the same position of the limiting arm 2, the slide block 35 moves to increase the compression amount of the upper and lower compression springs 28, and the reduction of the resistance torque caused by the weakening of the elasticity of the compression springs 28 is compensated. Because the position of the limiting plate 15 is repositioned by moving the sliding block 35, the effect of the limiting plate 15 is ensured to be exerted smoothly.

Claims

1. A durability limiter used on a vehicle comprises a mounting bracket fixed on a vehicle body, a limiting box fixed on a vehicle door, a rubber buffer block providing buffering force, a limiting arm and a clamping mechanism, wherein the upper end surface and the lower end surface of the limiting arm are respectively provided with two limiting bulges distributed along the length direction of the limiting arm; the limiting arm penetrates through the limiting box to be matched with a clamping mechanism arranged in the limiting shell; the method is characterized in that: the lower ends of two limiting bulges positioned on the lower end surface of the limiting arm in the four limiting bulges arranged on the limiting arm are respectively provided with a limiting plane;

the clamping mechanism comprises a roller, mounting plates, mounting frames, compression springs, a limiting plate, a guide rail shell, a sliding block, a second gear, a first rack, a second rack, a trigger plate and a brake mechanism, wherein the two mounting plates are arranged in the limiting box in a vertically sliding fit mode, the roller is arranged on the mounting frames in a rotating fit mode, and the two mounting frames are respectively arranged on the two mounting plates in a one-to-one correspondence mode through the two compression springs; the two rollers are in rolling fit with the limiting arm; a first rack and a second rack are further installed in the limiting box through up-down sliding fit, and one end of the first rack is connected with the mounting plate on the upper side through a connecting block; the second rack is connected with the mounting plate on the lower side through the transmission of a second gear and a third rack; the guide rail shell is arranged in the limiting box, the sliding block is arranged in the guide rail shell in a sliding fit manner, and the sliding block and the guide rail shell are in one-way sliding fit; the first gear is arranged on the sliding block in a rotating fit manner, and is respectively meshed with the first rack and the second rack, and the first rack and the second rack are positioned at two sides of the circle center of the first gear; a braking mechanism which plays a braking role in the rotation between the first gear and the sliding block is also arranged in the limiting box; the limiting arm is provided with a trigger plate which controls the brake mechanism to brake or not; the side surface of one end of the limiting arm, which is provided with the rubber buffer block, is also provided with an extrusion block which plays an extrusion role on the first rack and the second rack; the limiting plate is arranged on the sliding block through a connecting plate and is in contact fit with the mounting plate on the upper side;

the second gear is rotatably arranged in the limiting box, the third rack is connected with the mounting plate on the upper side through a connecting block, and the second gear is respectively meshed with the third rack and the second rack;

the limiting box is provided with an insertion hole for the limiting arm to pass through, and the upper end surface of the limiting box is provided with two adjusting holes for the first rack and the second rack to pass through;

the front end surface of the guide rail shell is provided with a through first square opening, one side surface in the guide rail shell is provided with a second square opening, and the other side surface in the guide rail shell is provided with a third square opening;

the braking mechanism comprises an installation rotating shaft, a conical friction block, a rolling ball and a lever, wherein a conical groove is formed in one end of a sliding block, the conical friction block is installed at one end of the installation rotating shaft, the rolling ball is installed on the conical friction block in a rolling mode, the installation rotating shaft is installed on the sliding block in a rotating fit mode, one end, provided with the conical friction block, of the installation rotating shaft penetrates through a third square opening in the guide rail shell and is located on the outer side of the guide rail shell, the conical friction block is in friction fit with the conical groove in the sliding block, and the other end of the installation rotating shaft penetrates through a second square; the lever is arranged in the limiting box in a swinging mode, and one end of the lever is matched with one end, provided with the conical friction block, of the mounting rotating shaft;

the first gear is fixedly arranged at one end of the mounting rotating shaft, which is not provided with the limiting disc, and the first rack and the second rack are respectively positioned at two sides of the first gear; one end of the connecting plate penetrates through a first square opening formed in the guide rail shell and is fixedly connected with the sliding block; the other end of the connecting plate is fixedly connected with the limiting plate;