Automobile seat height adjusting device with small idle stroke

Abstract

The utility model discloses an automobile seat height adjusting device with small idle stroke, which effectively reduces the idle stroke when the seat height is continuously adjusted, and comprises a shell and a sealing cover plate, a driving shaft is arranged in the shell, a star wheel is arranged on the lower side of the driving shaft, the star wheel comprises an outer wheel end and an output end, and a gasket is arranged on the outer side of the output end; a claw disc is arranged on the outer side of the driving shaft, a first rolling set is arranged between the driving shaft and the claw disc, a first spring is arranged between the first rolling set, the first rolling set comprises two first rolling columns, a first wedge-shaped face is arranged on the outer side of the driving shaft, and a limiting block is arranged between the two first rolling columns. Clamping claws are arranged on the lower side of the claw disc; the device is novel in structure, ingenious in conception and easy and convenient to operate, the use requirement of a small operation angle is effectively met, the stability of the device during operation is improved, the maximum bearing capacity of the device is increased, the service life of the device is prolonged, and workers can assemble and install the device conveniently.

Description

Technical Field

[0001] The utility model belongs to the technical field of seat height adjustment and relates to a vehicle seat height adjustment device with a small idle stroke. Background Art

[0002] Existing automobile seat height adjustment mechanisms are divided into two categories according to my country's automobile industry. One is a manual seat height adjustment mechanism, the common ones are a pump-type automobile seat height adjustment device and a rotary handle-type automobile seat height adjustment device; the other is an electric seat height adjustment mechanism. The former is used for manual adjustment of seat height. It is widely used because of its relatively simple structure, easy use, strong versatility, low cost and other advantages; the latter is used for electric adjustment of seat height. Because the electric seat assembly structure is relatively complex and the production cost is relatively high, it is mostly used in medium and high-end automobile seats and health and rehabilitation seats.

[0003] The pump-type car seat height adjustment device refers to a mechanism that allows drivers and passengers to adjust the seat height by pulling the operating handle up and down. This device has long been widely used in the domestic and foreign car seat manufacturing industry. With the rapid development of the automobile industry, the seat specifications and shapes vary, and there are more constraints and restrictions on the height adjuster. For example, in order to avoid interference between the height adjuster adjustment and the seat guard, the operating angle setting needs to be reduced, but this will result in a slow seat rise, more operations, and reduced comfort.

[0004] In addition, since the existing height adjustment devices all have the problem of idle stroke when continuously adjusting the height, the number of operations will be further increased when adjusting the seat height at a small angle, which is very inconvenient. Therefore, a car seat height adjustment device with a small idle stroke is needed to solve the above problem. Utility Model Content

[0005] In view of the above problems, the utility model proposes a vehicle seat height adjustment device with a small idle stroke, which well solves the problems in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A vehicle seat height adjustment device with a small idle stroke comprises a housing and a cover plate located at the lower side of the housing and fixedly connected to the housing by screws:

[0008] A rotatable drive shaft is disposed inside the housing, a star wheel that can rotate with the drive shaft is disposed on the lower side of the drive shaft, the star wheel includes an outer wheel end and an output end, and a gasket is sleeved on the outer side of the output end;

[0009] A claw plate is sleeved on the outer side of the driving shaft, a plurality of first roller groups are arranged between the driving shaft and the claw plate, a first spring is arranged between every two adjacent first roller groups, the first roller group includes two first rollers, a first wedge surface is arranged on the outer side of the driving shaft corresponding to the position of each first roller, and a limit block fixedly connected to the housing is arranged between the two first rollers of each first roller group;

[0010] A plurality of claws are fixedly connected to the lower side of the claw plate, a plurality of second roller groups corresponding to the claws are arranged on the outer side of the outer wheel end, a second spring is arranged between every two of the second roller groups, an outer wheel protrusion is arranged on the outer side of the outer wheel end corresponding to every two of the second roller groups, the second roller group includes two second rollers, and a second wedge surface is arranged at the position of the outer wheel end corresponding to each second roller;

[0011] A wave spring is arranged between the upper end surface of the claw plate and the shell.

[0012] Preferably, a first through hole is opened in the middle of the shell, the drive shaft extends out through the first through hole to be connected to the outside, a second through hole is opened in the middle of the cover plate, the output end extends out through the second through hole to be connected to the outside, and the gasket is sleeved between the outer side of the output end and the second through hole.

[0013] Preferably, a plurality of functional grooves are formed on a side of the claw plate close to the first roller group.

[0014] Preferably, the number of the first roller groups is three and they are evenly distributed around the circumference.

[0015] Preferably, the number of the second roller groups is five and they are evenly distributed around the circumference, and the outer wheel protrusion is connected to its two adjacent second wedge-shaped surfaces through a rounded corner.

[0016] Preferably, a plurality of thread grooves are formed inside the shell, and a plurality of connection holes are formed on the cover plate at a position corresponding to each thread groove.

[0017] Preferably, a plurality of fixing holes are formed on the outer side of the cover plate.

[0018] Preferably, a plurality of fixing blocks and a plurality of fixing rings are fixedly connected to the lower side of the gasket, and the fixing blocks and the fixing rings are arranged at intervals.

[0019] Preferably, an outer ring is provided inside the housing, and the outer ring is sleeved on the outer side of the claw.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. The utility model has a wave spring, which can provide friction when the claw plate rotates relative to the shell, so that the friction between the wave spring and the claw plate is greater than the friction between the first roller and the claw plate during the first spring recovery process, so that when the first spring drives the corresponding first roller and the drive shaft to rotate and reset, the claw plate will not rotate, which can reduce or even eliminate the idle stroke, and there is no loss of idle stroke when a small operating angle is required.

[0022] 2. The utility model has five second roller groups. By increasing the number of second roller groups and second wedge surfaces, the maximum strength of the device when locked can be effectively increased, which can not only improve the smoothness of the movement, but also reduce the risk of the seat mechanism sinking in bumpy conditions.

[0023] 3. The utility model has a functional groove opened on the upper side of the claw plate, which can not only reduce the weight of the claw plate and thus reduce the weight of the entire device, but also fill the lubricating medium between the claw plate and the drive shaft when necessary, thereby improving the overall smoothness of the device.

[0024] 4. The utility model has a gasket and a fixing block and a fixing ring fixedly connected to the lower side of the gasket. The hollow design of the fixing ring enables it to undergo more elastic deformation, so that when the gasket and the output end are matched, they can fit the outer contour of the output end, thereby increasing the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0026] Figure 2 It is a schematic diagram of the explosion structure of the utility model.

[0027] Figure 3 The figure is a schematic diagram of the explosion structure of the utility model from an upward viewing angle.

[0028] Figure 4 It is a schematic diagram of the matching state of the first roller and the first wedge surface in the utility model.

[0029] Figure 5 It is a schematic diagram of the matching state of the second roller and the second wedge surface in the utility model.

[0030] In the figure: 1. outer shell; 2. cover plate; 3. drive shaft; 4. star wheel; 5. outer wheel end; 6. output end; 7. gasket; 8. claw plate; 9. first roller group; 10. first spring; 11. first roller; 12. first wedge surface; 13. limit block; 14. claw; 15. second roller group; 16. second spring; 17. outer wheel protrusion; 18. second roller; 19. second wedge surface; 20. wave spring; 21. first through hole; 22. second through hole; 23. functional groove; 24. threaded groove; 25. connecting hole; 26. fixing hole; 27. fixing block; 28. fixing ring; 29. ​​outer ring. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The following is combined with Figure 1-Figure 5 The specific implementation modes of the present utility model are further described in detail.

[0033] Depend on Figure 1-Figure 5 The utility model comprises a housing 1 and a cover plate 2 located at the lower side of the housing 1 and fixedly connected to the housing 1 by screws. In order to reduce the idle stroke during the continuous height adjustment, a rotatable driving shaft 3 is provided inside the housing 1, and a star wheel 4 which can rotate with the driving shaft 3 is provided at the lower side of the driving shaft 3. The star wheel 4 comprises an outer wheel end 5 and an output end 6, and a gasket 7 is sleeved on the outer side of the output end 6.

[0034] A claw plate 8 is sleeved on the outer side of the driving shaft 3, a plurality of first roller groups 9 are arranged between the driving shaft 3 and the claw plate 8, a first spring 10 is arranged between every two adjacent first roller groups 9, the first roller group 9 includes two first rollers 11, a first wedge surface 12 is arranged on the outer side of the driving shaft 3 corresponding to the position of each first roller 11, and a limit block 13 fixedly connected to the housing 1 is arranged between the two first rollers 11 of each first roller group 9;

[0035] A plurality of claws 14 are fixedly connected to the lower side of the claw plate 8. The cross-sectional shape of the claws 14 is a triangle with rounded corners, which can push the second roller 18 to move. A plurality of second roller groups 15 corresponding to the claws 14 are arranged on the outer side of the outer wheel end 5. A second spring 16 is arranged between every two of the second roller groups 15. An outer wheel protrusion 17 is arranged on the outer side of the outer wheel end 5 corresponding to every two of the second roller groups 15. The second roller group 15 includes two second rollers 18. A second wedge surface 19 is arranged on the outer wheel end 5 corresponding to the position of each second roller 18.

[0036] A wave spring 20 is provided between the upper end surface of the claw plate 8 and the outer shell 1. The wave spring 20 is referred to as a wave spring. It is an elastic element with a plurality of peaks and valleys on a thin metal ring. It has a compact structure and requires a smaller installation space under the same physical parameter conditions. The wave spring 20 can prevent the upper side of the claw plate 8 from directly contacting the outer shell 1, thereby reducing the friction between the two, and can also provide friction force for the claw plate 8 to rotate relative to the outer shell 1, thereby reducing the idle stroke of the claw plate 8 when it is reset and reducing the number of operations by the operator.

[0037] Further, by Figure 1-Figure 5 It is given that, in order to facilitate the staff to assemble the device, a first through hole 21 is opened in the middle of the shell 1, the drive shaft 3 extends out through the first through hole 21 and is connected to the outside, which is used to connect the drive handle, and a second through hole 22 is opened in the middle of the cover plate 2, the output end 6 extends out through the second through hole 22 and is connected to the outside, which is used to connect the four-bar mechanism for seat lifting, and the washer 7 is sleeved between the outer side of the output end 6 and the second through hole 22. The washer 7 can avoid direct contact between the star wheel 4 and the second through hole 22 (i.e., the cover plate 2), thereby reducing rotational friction and increasing the service life of the device.

[0038] Further, by Figure 1-Figure 5 It is given that in order to enable the device to run more smoothly, a plurality of functional grooves 23 are provided on one side of the claw plate 8 close to the first roller group 9. By providing the functional grooves 23, the weight of the claw plate 8 can be reduced, thereby reducing the overall weight of the device, and lubricating medium can be filled between the claw plate 8 and the drive shaft 3 when necessary, thereby improving the overall smoothness of the device.

[0039] Further, by Figure 1-Figure 5 It is given that, in order to increase the locking strength of the device and further increase the smoothness of the device during operation, the number of the first roller groups 9 is three and they are evenly distributed around the circumference; the number of the second roller groups 15 is five and they are evenly distributed around the circumference, and the outer wheel protrusion 17 is connected to its two adjacent second wedge-shaped surfaces 19 through a fillet;

[0040] When in use, by controlling the first roller group 9, the second roller group 15 and the other corresponding parts (the first wedge surface 12, the claw 14, the outer wheel protrusion 17, the second wedge surface 19, etc.), especially through the larger number of second roller groups 15 and second wedge surfaces 19, the strength of the device when locked can be effectively increased, which can not only improve the smoothness of the movement, but also reduce the risk of the seat mechanism sinking in bumpy conditions.

[0041] Further, by Figure 1-Figure 5 It is shown that, in order to facilitate the staff to assemble the device, a plurality of thread grooves 24 are provided inside the housing 1, and a plurality of connection holes 25 are provided on the cover plate 2 corresponding to each thread groove 24;

[0042] When in use, the device can be fixed with screws through the connecting hole 25 and the threaded groove 24, thereby increasing the airtightness inside the device and increasing the smoothness of the operation of the device.

[0043] Further, by Figure 1-Figure 5 It is given that, in order to facilitate the installation of the device, a plurality of fixing holes 26 are opened on the outer side of the cover plate 2. When in use, the cover plate 2 and the shell 1 can be fixed to a suitable position of the seat through the fixing holes 26.

[0044] Further, by Figure 1-Figure 5 It is given that, in order to facilitate the installation of the gasket 7 and reduce the gap after assembly, a plurality of fixing blocks 27 and a plurality of fixing rings 28 are fixedly connected to the lower side of the gasket 7, and the fixing blocks 27 and the fixing rings 28 are arranged at intervals. The fixing blocks 27 and the fixing rings 28 are both made of rubber material. The hollow design of the fixing ring 28 can enable it to undergo more elastic deformation, so that when the gasket 7 is matched with the output terminal 6, it can fit the outer contour of the output terminal 6.

[0045] Furthermore, an outer ring 29 is provided inside the outer shell 1, and the outer ring 29 is fixedly connected to the outer shell 1. The outer ring 29 is sleeved on the outer side of the claw 14 to protect the claw 14 and the outer wheel protrusion 17 from direct contact and friction with the inner side surface of the outer shell 1, and at the same time, the second roller 18 can be limited.

[0046] The working principle of this utility model:

[0047] The utility model adopts a roller-type two-way overrunning clutch structure, including an upper and lower two-stage structure:

[0048] The first-stage overrunning clutch is composed of a housing 1, a limit block 13, a first roller 11, a first spring 10, a drive shaft 3 and a claw plate 8. The first wedge surface 12, the first roller 11 and the inner side of the claw plate 8 cooperate with each other to form a structure in which the drive shaft 3 drives the claw plate 8 to rotate, and the claw plate 8 cannot drive the drive shaft 3 to rotate, thereby realizing wedge transmission and overrunning;

[0049] The second-stage overrunning clutch is composed of a claw 14, an outer ring 29, a star wheel 4, a second roller 18, a second spring 16 and a second wedge surface 19. The claw 14 can drive the star wheel 4 to rotate by cooperating with the second roller 18, the second wedge surface 19 and the outer ring 29, while the star wheel 4 cannot drive the claw 14 to rotate, thereby realizing wedge transmission and rotation overrunning. The second spring 16 can always make each second roller 18 wedge-fit with the corresponding second wedge surface 19 when the claw 14 does not rotate, thereby locking and limiting the star wheel 4.

[0050] In addition, the first-stage overrunning clutch and the second-stage overrunning clutch are connected via a claw 14 fixedly connected to the claw plate 8 for transmitting torque, wherein the first-stage overrunning clutch is mainly used for transmitting rotational torque, and the second-stage overrunning clutch is mainly used for locking and torque output.

[0051] When the device is in use:

[0052] The device can be fixed at the power input position of the four-bar linkage for lifting the seat, the output end 6 of the star wheel 4 is connected to the power input end of the seat lifting mechanism, and the device is fixed to the seat through the fixing hole 26, and then the driving handle is connected to the driving shaft 3, and the height of the seat can be adjusted by rotating the driving handle;

[0053] When the device is in operation, it can be divided into three parts: driving process, recovery process and star wheel 4 locking process:

[0054] During the driving process, the driving handle is turned to rotate the driving shaft 3. Since the relative positions of the housing 1, the limit block 13 and the seat are fixed, the driving shaft 3 squeezes the three first rollers 11 in the same direction under the action of the first wedge surface 12, so that they are tightly wedged with the inner side of the claw plate 8, thereby driving the claw plate 8 to rotate. At the same time, the three first rollers 11 in the opposite direction of the limit block 13 are limited by the limit block 13, and the first spring 10 is compressed and stores force; when the claw plate 8 rotates, it drives the claw 14 to rotate, and then the outer wheel protrusion 17 is pushed by the five second rollers 18 in the same direction to drive the outer wheel end 5 of the star wheel 4 to rotate, and then the output end 6 of the star wheel 4 drives the four-bar linkage for seat lifting to operate, so as to adjust the height of the seat;

[0055] During the recovery process, the driving handle is released. At this time, under the action of the second spring 16, the five second rollers 18 in the opposite direction of the driving process are wedged tightly with the corresponding second wedge surfaces 19, and the star wheel 4 no longer rotates. At the same time, under the action of the second spring 16, the five second rollers 18 in the same direction of the driving process are moved in the opposite direction by a small angle to cooperate with the corresponding second wedge surfaces 19. At this time, each second roller 18, the second spring 16 and the star wheel 4 are fixed relative to the housing 1 and the outer ring 29. Then, because the limit block 13 is always in a fixed position, under the action of the first spring 10 in the power storage state, the corresponding first roller 11, the driving shaft 3 and the driving handle are pushed to reset;

[0056] When locking, under the action of each second spring 16, each second roller 18 is wedge-fitted with the outer ring 29 through the corresponding second wedge surface 19, so that the star wheel 4 will not rotate relative to the outer ring 29, thereby achieving the locking of the star wheel 4. When the seat is subjected to gravity, it is transmitted to the star wheel 4 through the four-bar linkage of the seat mechanism. Since the star wheel 4 has a wedge-fitting angle with the second roller 18 and the outer ring 29, a locking phenomenon will occur. The greater the external force, the more tightly the star wheel 4 is locked. It will only fail when the external force is greater than the yield strength of the material (that is, when the material is deformed). Furthermore, by designing the number of second roller groups 15 and second wedge surfaces 19, the maximum bearing capacity of the lock can be further increased.

[0057] It should be explained in detail that, during the recovery process when the wave spring 20 is not installed, due to the friction force generated by the first roller 11 through the first wedge surface 12 and the claw plate 8, the claw plate 8 and the claw 14 will rotate in the opposite direction by a certain angle, so that each claw 14 contacts the five second rollers 18 in the opposite direction during the driving process, and then when the driving handle is continuously operated (when the seat is continuously raised or lowered), there will be an idle stroke each time the claw 14 contacts the corresponding second roller 18, which will increase the number of operations of the driver and the passenger; during the recovery process after the wave spring 20 is installed, the wave spring 20 can provide friction when the claw plate 8 rotates relative to the housing 1, so that the friction between the wave spring 20 and the claw plate 8 is greater than the friction between the first roller 11 and the claw plate 8 during the recovery process of the first spring 10, and then when the first spring 10 drives the corresponding first roller 11 and the drive shaft 3 to rotate and reset, the claw plate 8 will not rotate, so that the idle stroke can be reduced or even eliminated, and there is no loss of idle stroke when the use requirement of a small operating angle is met, so that the use of a small operating angle can be achieved;

[0058] In addition, when designing the utility model, by increasing the diameter of each component (such as the outer shell 1, the drive shaft 3, the claw plate 8, the star wheel 4, etc.), it is possible to further increase the maximum bearing capacity when locked and indirectly increase the length of the first spring 10, thereby making the restoring torque of the first spring 10 on the drive handle during the return process larger and more stable, thereby increasing the return speed during the return process; by reducing the total thickness of the device, the total height of the device after installation can be reduced, and better use of the space inside the vehicle can be made.

[0059] The utility model has a novel structure, ingenious conception, and simple and convenient operation. Through the design, the idle stroke when the seat height is continuously adjusted is effectively reduced, the demand for use at a small operating angle is met, the stability of the device during operation is increased, the maximum bearing capacity of the device is increased, the service life of the device is increased, and it is convenient for staff to assemble and install the device.

[0060] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A height adjustment device for a car seat with a small idle stroke, comprising a housing and a cover plate located at the lower side of the housing and fixedly connected to the housing by screws, characterized in that: A rotatable drive shaft is disposed inside the housing, a star wheel that can rotate with the drive shaft is disposed on the lower side of the drive shaft, the star wheel includes an outer wheel end and an output end, and a gasket is sleeved on the outer side of the output end; A claw plate is sleeved on the outer side of the driving shaft, a plurality of first roller groups are arranged between the driving shaft and the claw plate, a first spring is arranged between every two adjacent first roller groups, the first roller group includes two first rollers, a first wedge surface is arranged on the outer side of the driving shaft corresponding to the position of each first roller, and a limit block fixedly connected to the housing is arranged between the two first rollers of each first roller group; A plurality of claws are fixedly connected to the lower side of the claw plate, a plurality of second roller groups corresponding to the claws are arranged on the outer side of the outer wheel end, a second spring is arranged between every two of the second roller groups, an outer wheel protrusion is arranged on the outer side of the outer wheel end corresponding to every two of the second roller groups, the second roller group includes two second rollers, and a second wedge surface is arranged at the position of the outer wheel end corresponding to each second roller; A wave spring is arranged between the upper end surface of the claw plate and the shell.

2. The height adjustment device for a car seat with a small idle travel according to claim 1, characterized in that: A first through hole is provided in the middle of the shell, and the drive shaft extends out through the first through hole to be connected to the outside. A second through hole is provided in the middle of the cover plate, and the output end extends out through the second through hole to be connected to the outside. The gasket is sleeved between the outer side of the output end and the second through hole.

3. The height adjustment device for a car seat with a small idle travel according to claim 1, characterized in that: A plurality of functional grooves are formed on a side of the claw plate close to the first roller group.

4. The height adjustment device for a car seat with a small idle travel according to claim 1, characterized in that: The number of the first roller groups is three and they are evenly distributed around the circumference.

5. The height adjustment device for a car seat with a small idle travel according to claim 1, characterized in that: The number of the second roller groups is five and they are evenly distributed around the circumference, and the outer wheel protrusion is connected to two adjacent second wedge-shaped surfaces via a rounded corner.

6. The height adjustment device for a car seat with a small idle travel according to claim 1, characterized in that: The shell is provided with a plurality of thread grooves inside, and the cover plate is provided with a plurality of connection holes at a position corresponding to each thread groove.

7. The vehicle seat height adjustment device with small idle travel according to claim 1, characterized in that: A plurality of fixing holes are formed on the outer side of the cover plate.

8. The vehicle seat height adjustment device with small idle travel according to claim 1, characterized in that: A plurality of fixing blocks and a plurality of fixing rings are fixedly connected to the lower side of the gasket, and the fixing blocks are spaced apart from the fixing rings.

9. The vehicle seat height adjustment device with small idle travel according to claim 1, characterized in that: An outer ring is arranged inside the housing and is sleeved on the outer side of the claw.

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