Wheelchair rear wheel four-rod linkage suspension shock-absorbing device and wheelchair thereof

Abstract

The utility model provides a wheelchair rear wheel four-bar linkage suspension shock-absorbing device and a wheelchair thereof, and relates to the technical field of wheelchairs, the wheelchair rear wheel four-bar linkage suspension shock-absorbing device comprises a mounting plate and rear wheels, the mounting plate is connected with a linkage suspension member, the linkage suspension member is connected with a wheel carrier plate, and the rear wheels are rotatably arranged on the wheel carrier plate; the linkage suspension piece enables the rear wheel to be lifted in a vertical state relative to the ground; the upper end of the damper is connected with the mounting plate, and the lower end of the damper is connected to the side, away from the mounting plate, of the linkage suspension part; the damper is arranged in an inclined mode, the included angle between the damper and the installation plate is set to be alpha, alpha is smaller than 90 degrees, and the angle alpha can be gradually increased along with gradual rising of the rear wheel. The wheel chair has the advantages that when the rear wheels encounter obstacles on the road in the running process of the wheel chair, the rear wheels can jump and compress the dampers upwards through the wheel shafts, the wheel carrier plates and the linkage suspension pieces, and therefore bumping generated when the rear wheels jump is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchairs, in particular to a four-bar linkage suspension shock absorption device for the rear wheels of a wheelchair and a wheelchair thereof. Background Art

[0002] As a commonly seen transportation device in daily life, a wheelchair is often used in hospitals or for people with inconvenient mobility. The cushioning effect of the wheelchair directly affects the experience and feeling of the user sitting on the wheelchair.

[0003] In the prior art, Chinese Patent Publication No. CN211750567U discloses a wheelchair with a shock absorption device design. Its technical solution regarding the shock absorption structure is as follows: The shock absorption device includes a shock absorption U-shaped fixing piece and a shaft rod. The lower end surface of the frame is hinged to a shock absorption telescopic rod through the shock absorption U-shaped fixing piece. A shock absorption spring is sleeved on the shock absorption telescopic rod. The bottom of the shock absorption telescopic rod is movably connected to a bracket through a motor fixed welding part. When the electric wheelchair travels on an uneven road surface and there are roadblocks on the road surface, the rear wheel of the wheelchair rolls over the roadblock, the rear wheel rises, driving the movably connected motor fixed welding part to be lifted. At this time, the shock absorption telescopic rod expands and contracts, and the length becomes shorter. The shock absorption telescopic rod applies pressure to the shock absorption spring, driving the shock absorption spring to deform. Among them, it can be known from the prior art that the shock absorption telescopic rod has an outer cylinder and an inner rod, and the expansion and contraction of the shock absorption telescopic rod means that the inner rod moves relative to the outer cylinder. This kind of buffer structure is similar to the sliding rail method adopted by the existing wheelchair rear wheel shock absorption devices on the market, and the principle is basically the same. In the structure of the sliding rail method, the wheel axle and the wheel are fixed on the inner sliding rail, and the wheel shock absorption effect is achieved by compressing the spring through the inner sliding rail. However, the disadvantage of this kind of sliding rail shock absorption device is that since the rear wheel of the wheelchair is fixed on the inner sliding rail, when the wheel compresses the spring for shock absorption, friction and resistance will be generated between the inner sliding rail and the outer sliding rail device, making the shock absorption spring unable to completely absorb the vibration generated by the bumps.

[0004] Based on this, it is necessary to disclose a four-bar linkage suspension shock absorption device for the rear wheels of a wheelchair to overcome the above defects. Summary of the Utility Model

[0005] The utility model overcomes the shortcomings in the prior art and provides a four-bar linkage suspension shock absorption device for the rear wheels of a wheelchair and a wheelchair thereof, which has good stability and helps to eliminate the bumps generated by the rear wheel jumping.

[0006] In order to solve the above technical problems, the utility model is realized through the following technical solutions:

[0007] A four-bar linkage suspension shock absorber for the rear wheels of a wheelchair, comprising a mounting plate and rear wheels. A linkage suspension member is connected to the mounting plate, a wheel carrier plate is connected to the linkage suspension member, and the rear wheels are rotatably arranged on the wheel carrier plate; the linkage suspension member enables the rear wheels to rise and fall while maintaining a vertical state relative to the ground; it further comprises a damper, the upper end of the damper is connected to the mounting plate, and the lower end of the damper is connected to the side of the linkage suspension member away from the mounting plate; the damper is arranged obliquely, and the included angle between the damper and the mounting plate is set as α, α < 90°, and the angle α will gradually increase as the rear wheels gradually rise.

[0008] Furthermore, the linkage suspension member comprises a first shaft member, a second shaft member, a third shaft member, and a fourth shaft member; the first shaft member and the second shaft member are located above as one group, and the third shaft member and the fourth shaft member are located below as another group; the first shaft member, the second shaft member, the third shaft member, and the fourth shaft member are pairwise parallel to each other; and the horizontal projection areas of the first shaft member and the third shaft member coincide, and the horizontal projection areas of the second shaft member and the fourth shaft member coincide.

[0009] Furthermore, first link rods are connected to both sides of the first shaft member and the second shaft member, and second link rods are connected to both sides of the third shaft member and the fourth shaft member; the upper end of the wheel carrier plate is rotatably connected to the second shaft member, and the lower end of the wheel carrier plate is rotatably connected to the fourth shaft member; both the first shaft member and the third shaft member are rotatably connected to the mounting plate; the mounting plate, the first link rods, the wheel carrier plate, and the second link rods are connected to form a linkage structure.

[0010] Furthermore, the included angle between the first link rod and the wheel carrier plate is β, and the included angle between the wheel carrier plate and the second link rod is γ. In the initial state, β > γ; when the rear wheels are stressed and rise, the angle β will gradually increase, the angle γ will gradually decrease, and β and γ satisfy the following formula: β + γ = 180°.

[0011] Furthermore, a wheel axle is arranged on the wheel carrier plate, and the rear wheels are rotatably connected to the wheel axle; the wheel axle is perpendicularly arranged to the side surface of the wheel carrier plate.

[0012] Furthermore, both the mounting plate and the wheel carrier plate are stamped into an arch shape with a recess, and the recesses of the two face each other; the recess of the mounting plate is provided with a first pair of lugs and a second pair of lugs; the first shaft member is connected to the first pair of lugs, and the third shaft member is connected to the second pair of lugs; the wheel carrier plate is provided with a third pair of lugs and a fourth pair of lugs; the second shaft member is connected to the third pair of lugs, and the fourth shaft member is connected to the fourth pair of lugs.

[0013] Furthermore, the structures of the first shaft member, the second shaft member, the third shaft member, and the fourth shaft member all include bolts, nuts are connected to the ends of the bolts, and bushings are sleeved in the bolts; the lower end of the damper is connected to the bolt of the second shaft member.

[0014] Furthermore, plain bearings are provided on the inner sides of the first connecting rod and the second connecting rod.

[0015] The present utility model also claims protection for a wheelchair, which includes the four-bar linkage suspension shock absorber device for the rear wheels of the wheelchair; the wheelchair frame, and the mounting plate is fixed on the wheelchair frame.

[0016] Furthermore, the wheelchair frame is in the shape of an integrally formed arc rod with an opening facing downwards, and the linkage suspension member is located in the area surrounded by the wheelchair frame.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] The present utility model includes a mounting plate and a rear wheel. A linkage suspension member is connected to the mounting plate, a wheel frame plate is fixed on the linkage suspension member, and the rear wheel is rotatably mounted on the wheel frame plate; the linkage suspension member can make the rear wheel lift in a state perpendicular to the ground relatively, so that the rear wheel will not be laterally deflected, and the stability is good; in addition, when the rear wheel encounters a road obstacle during the wheelchair driving, the rear wheel will jump, and the rear wheel will compress the damper upwards through the wheel axle, the wheel frame plate and the linkage suspension member, thereby eliminating the bumps generated by the rear wheel jump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings are used to provide a further understanding of the present utility model, and are used together with the embodiments of the present utility model to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0020] Figure 1 is the overall view of the four-bar linkage suspension shock absorber device for the rear wheels of the wheelchair in the embodiment of the present utility model;

[0021] Figure 2 is the side view of the four-bar linkage suspension shock absorber device for the rear wheels of the wheelchair in the embodiment of the present utility model;

[0022] Figure 3 is the exploded view of the four-bar linkage suspension shock absorber device for the rear wheels of the wheelchair in the embodiment of the present utility model;

[0023] Figure 4 is the schematic diagram of the connection between the four-bar linkage suspension shock absorber device for the rear wheels of the wheelchair in the embodiment of the present utility model and the wheelchair frame;

[0024] Figure 5 is Figure 4 the three-dimensional schematic diagram after removing the rear wheel in

[0025] In the figure: 1. mounting plate; 101. first pair of lugs; 102. second pair of lugs; 2. rear wheel; 3. linkage suspension member; 301. first shaft member; 3011. bolt; 3012. nut; 3013. bushing; 302. second shaft member; 303. third shaft member; 304. fourth shaft member; 305. first connecting rod; 306. second connecting rod; 4. wheel frame plate; 401. third pair of lugs; 402. fourth pair of lugs; 5. damper; 6. wheel axle; 7. plain bearing; 8. wheelchair frame. Specific embodiments

[0026] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present utility model and are not used to limit the present utility model.

[0027] As Figures 1 to 3 shown, a four-bar linkage suspension shock absorber device for the rear wheel of a wheelchair includes a mounting plate 1 and a rear wheel 2. In this embodiment, the rear wheel 2 is the rear wheel of the wheelchair. A linkage suspension member 3 is connected to the mounting plate 1, a wheel frame plate 4 is connected to the linkage suspension member 3, and the rear wheel 2 is rotatably arranged on the wheel frame plate 4. In this embodiment, a wheel axle 6 is provided on the wheel frame plate 4, and the rear wheel 2 is rotatably connected to the wheel axle 6. Since the side surface of the wheel frame plate 4 is perpendicular to the ground and the wheel axle 6 is perpendicular to the side surface of the wheel frame plate 4, the rear wheel 2 can be kept perpendicular to the ground after installation. The function of the linkage suspension member 3 is to make the rear wheel 2 rise and fall in a state perpendicular to the ground relatively, without lateral deviation and with good stability.

[0028] It further includes a damper 5. The upper end of the damper 5 is connected to the mounting plate 1, and the lower end of the damper 5 is connected to the side of the linkage suspension member 3 far from the mounting plate 1. Since the linkage suspension member 3 will deform after the rear wheel 2 is stressed, the upper end and the lower end of the damper 5 are rotatably connected to the mounting plate 1 and the linkage suspension member 3 respectively. As Figure 2 seen, the damper 5 is arranged obliquely. The damper 5 has a buffering function. Let the included angle between the damper 5 and the mounting plate 1 be α, α < 90°, and the angle α will gradually increase as the rear wheel 2 gradually rises. When the rear wheel 2 of the wheelchair encounters a road obstacle during driving, the rear wheel 2 will jump, and the linkage suspension member 3 will make the rear wheel 2 rise in a state basically perpendicular. When the rear wheel 2 rises relative to the mounting plate 1, the damper 5 will be compressed. After the rear wheel 2 passes over the obstacle, the spring in the damper 5 will make the damper 5 recover and extend, so that the rear wheel 2 returns and descends relative to the mounting plate 1. The included angle α < 90° makes the damper 5 have a downward pressing force on the linkage suspension member 3.

[0029] Specifically, the linkage suspension member 3 includes a first shaft member 301, a second shaft member 302, a third shaft member 303, and a fourth shaft member 304. The first shaft member 301 and the second shaft member 302 are located above as one group, and the third shaft member 303 and the fourth shaft member 304 are located below as another group. The first shaft member 301, the second shaft member 302, the third shaft member 303, and the fourth shaft member 304 are pairwise parallel to each other. Moreover, the horizontal projection areas of the first shaft member 301 and the third shaft member 303 coincide, and the horizontal projection areas of the second shaft member 302 and the fourth shaft member 304 coincide. The linkage suspension member 3 formed by connecting the first shaft member 301, the second shaft member 302, the third shaft member 303, and the fourth shaft member 304 has a compact structure.

[0030] On both sides of the first shaft member 301 and the second shaft member 302, first connecting rods 305 are connected. On both sides of the third shaft member 303 and the fourth shaft member 304, second connecting rods 306 are connected. The upper end of the wheel carrier plate 4 is rotatably connected to the second shaft member 302, and the lower end of the wheel carrier plate 4 is rotatably connected to the fourth shaft member 304. Both the first shaft member 301 and the third shaft member 303 are rotatably connected to the mounting plate 1. The mounting plate 1, the first connecting rods 305, the wheel carrier plate 4, and the second connecting rods 306 are connected to form a linkage structure. As Figure 2 shown, the angle between the first connecting rod 305 and the wheel carrier plate 4 is β, and the angle between the wheel carrier plate 4 and the second connecting rod 306 is γ. In the initial state, β > γ. When the rear wheel 2 is stressed and rises, the angle β will gradually increase, and the angle γ will gradually decrease, and β and γ satisfy the following formula: β + γ = 180°. Setting β > γ in the initial state allows the linkage suspension member 3 to have a larger upward deformation space, that is, it allows the wheel carrier plate 4 and the rear wheel 2 to have a larger upward height increase amplitude, and can cross relatively high road obstacles.

[0031] As Figure 3 shown, both the mounting plate 1 and the wheel carrier plate 4 are stamped into an arch shape with a recess. The arch shape can enhance the structural strength of both the mounting plate 1 and the wheel carrier plate 4, and their recesses correspond to each other. The recess of the mounting plate 1 is provided with a first ear pair 101 and a second ear pair 102. The first shaft member 301 is connected to the first ear pair 101, and the third shaft member 303 is connected to the second ear pair 102. The wheel carrier plate 4 is provided with a third ear pair 401 and a fourth ear pair 402. The second shaft member 302 is connected to the third ear pair 401, and the fourth shaft member 304 is connected to the fourth ear pair 402. Moreover, the recesses of the mounting plate 1 and the wheel carrier plate 4 form a certain inclusion state for the first shaft member 301, the third shaft member 303, the second shaft member 302, and the fourth shaft member 304, making the overall structure compact.

[0032] The structures of the first shaft member 301, the second shaft member 302, the third shaft member 303, and the fourth shaft member 304 are all basically the same. CombiningFigure 3 Look, they mainly include bolts 3011. Perforations are provided on both the first connecting rod 305 and the second connecting rod 306. The installation method is that the bolt 3011 passes through the corresponding perforations on the first connecting rod 305 and the second connecting rod 306, and is fixed to the corresponding first lug pair 101, second lug pair 102, third lug pair 401, and fourth lug pair 402; then a nut 3012 is screwed onto the bolt 3011 for fixation; the lower end of the elastic pressing member 5 is connected to the bolt 3011 of the second shaft member 302; a bushing 3013 is sleeved in the bolt 3011; the bushing 3013 is wrapped outside the bolt 3011, so that the bushing 3013 plays a role in protecting the bolt 3011; the bushing 3013 also enhances the support strength of the two-sided lugs. Plain bearings 7 are provided on the inner sides of both the first connecting rod 305 and the second connecting rod 306. The plain bearings 7 are sleeved and installed on the bolt 3011. The plain bearing is an element composed of a plain cage assembly with needle rollers or cylindrical rollers or steel balls and a plain washer. Combining Figure 1 and Figure 3 Look, one side surface of the plain bearing 7 is in contact with the corresponding first lug pair 101, second lug pair 102, third lug pair 401, and fourth lug pair 402, and the other side surface of the plain bearing 7 is in contact with the inner side surface of the first connecting rod 305 or the second connecting rod 306. Thus, when the linkage suspension member 3 undergoes a deformation movement, there will be no wear between the lugs and the inner side surface of the first connecting rod 305 or the second connecting rod 306.

[0033] As Figure 4 and Figure 5 shown, the present utility model also claims to protect a wheelchair, including the four-bar linkage suspension shock absorber device for the rear wheel of the wheelchair according to any one of the above; including a wheelchair frame 8, and the mounting plate 1 is fixed on the wheelchair frame 8; and the wheelchair frame 8 is an integral arc-shaped rod with an opening facing downwards. The linkage suspension member 3 is located in the area surrounded by the wheelchair frame 8, so that the linkage suspension member 3 has a hidden effect, and the rear wheel 2 is more closely attached to the wheelchair frame 8, making the structure more compact.

[0034] Finally, it should be noted that: The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A wheelchair rear wheel four-bar linkage suspension shock-absorbing device, characterized in that: The invention comprises a mounting plate (1) and a rear wheel (2), wherein the mounting plate (1) is connected with a linkage suspension member (3), the linkage suspension member (3) is connected with a wheel frame plate (4), and the wheel frame plate (4) is rotatably provided with a rear wheel (2); the linkage suspension member (3) enables the rear wheel (2) to maintain a vertical state relative to the ground for lifting and lowering; and further comprises a damper (5), wherein the upper end of the damper (5) is connected with the mounting plate (1), and the lower end of the damper (5) is connected to a side of the linkage suspension member (3) away from the mounting plate (1); the damper (5) is arranged in an inclined shape, and an angle α between the damper (5) and the mounting plate (1) is set to be α, α<90°, and the angle α gradually increases as the rear wheel (2) gradually rises.

2. The wheelchair rear wheel four-bar linkage suspension shock-absorbing device according to claim 1, characterized in that: The linkage suspension member (3) comprises a first shaft member (301), a second shaft member (302), a third shaft member (303), and a fourth shaft member (304); the first shaft member (301) and the second shaft member (302) are located at the top as one group, and the third shaft member (303) and the fourth shaft member (304) are located at the bottom as another group; the first shaft member (301), the second shaft member (302), the third shaft member (303), and the fourth shaft member (304) are parallel to each other; and the horizontal projection areas of the first shaft member (301) and the third shaft member (303) overlap, and the horizontal projection areas of the second shaft member (302) and the fourth shaft member (304) overlap.

3. The wheelchair rear wheel four-bar linkage suspension shock-absorbing device according to claim 2, characterized in that: The first shaft member (301) and the second shaft member (302) are both connected to the first connecting rod (305) on both sides, and the third shaft member (303) and the fourth shaft member (304) are both connected to the second connecting rod (306) on both sides; the upper end of the wheel frame plate (4) is rotatably connected to the second shaft member (302), and the lower end of the wheel frame plate (4) is rotatably connected to the fourth shaft member (304); the first shaft member (301) and the third shaft member (303) are both rotatably connected to the mounting plate (1); the mounting plate (1), the first connecting rod (305), the wheel frame plate (4), and the second connecting rod (306) are connected to form a linkage structure.

4. The wheelchair rear wheel four-bar linkage suspension shock-absorbing device according to claim 3, characterized in that: The angle between the first connecting rod (305) and the wheel frame plate (4) is β, and the angle between the wheel frame plate (4) and the second connecting rod (306) is γ. In the initial state, β>γ; when the force on the rear wheel (2) increases, the angle β will gradually increase, and the angle γ will gradually decrease, and β and γ satisfy the following formula: β+γ=180°.

5. The wheelchair rear wheel four-bar linkage suspension shock-absorbing device according to claim 1, characterized in that: The wheel frame plate (4) is provided with a wheel axle (6), and the rear wheel (2) is rotatably connected to the wheel axle (6); the wheel axle (6) is vertically arranged on the side of the wheel frame plate (4).

6. The wheelchair rear wheel four-bar linkage suspension shock-absorbing device according to claim 2, characterized in that: The mounting plate (1) and the wheel frame plate (4) are both stamped into a bow shape with a recessed position, and the recessed positions of the two are opposite to each other; the recessed position of the mounting plate (1) is provided with a first pair of ears (101) and a second pair of ears (102); the first shaft member (301) is connected to the first pair of ears (101), and the third shaft member (303) is connected to the second pair of ears (102); the wheel frame plate (4) is provided with a third pair of ears (401) and a fourth pair of ears (402); the second shaft member (302) is connected to the third pair of ears (401), and the fourth shaft member (304) is connected to the fourth pair of ears (402).

7. The wheelchair rear wheel four-bar linkage suspension shock-absorbing device according to claim 6, characterized in that: The structures of the first shaft member (301), the second shaft member (302), the third shaft member (303) and the fourth shaft member (304) all include a bolt (3011), the end of the bolt (3011) is connected with a nut (3012), and a bushing (3013) is inserted into the bolt (3011); the lower end of the damper (5) is connected to the bolt (3011) of the second shaft member (302).

8. The wheelchair rear wheel four-bar linkage suspension shock-absorbing device according to claim 3, characterized in that: Plane bearings (7) are provided on the inner sides of the first connecting rod (305) and the second connecting rod (306).

9. A wheelchair, characterized in that: A wheelchair rear wheel four-bar linkage suspension shock-absorbing device comprising any one of claims 1 to 8; comprising a wheelchair frame (8), and a mounting plate (1) fixed on the wheelchair frame (8).

10. The wheelchair according to claim 9, characterized in that: The wheelchair frame (8) is in the shape of an integrated arc rod with an opening facing downward, and the linkage suspension component (3) is located in the area surrounded by the wheelchair frame (8).

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