Vibration-absorbing structure, wheel assembly and trolley

Abstract

This invention discloses a shock-absorbing structure, a wheel assembly, and a trolley. The shock-absorbing structure includes a first seat, a second seat movably disposed relative to the first seat, a shock-absorbing element, and a limiting member. The second seat has an abutment portion and a clearance portion. The shock-absorbing element is supported between the first and second seats. The limiting member is disposed on the first seat and has a first position and a second position relative to the second seat. In the first position, the limiting member and the clearance portion are opposite each other, and there is a first movement space between them. In the second position, the limiting member and the abutment portion are opposite each other, and the limiting member abuts the abutment portion, or there is a second movement space between them, which is smaller than the first movement space. In this shock-absorbing structure, when the limiting member is in the first position, the shock-absorbing element achieves a buffering and shock-absorbing effect; when the limiting member is in the second position, it restricts the elastic deformation of the shock-absorbing element. The shock-absorbing structure is approximately a rigid structure, making the trolley with the shock-absorbing structure less prone to tipping over.

Description

Technical Field

[0001] This invention relates to the field of children's products technology, specifically to a shock-absorbing structure, wheel assembly, and stroller. Background Technology

[0002] Strollers are an important means of transportation for children. When a stroller is pushed on an uneven surface, the bumpy surface often causes the stroller to vibrate a lot, making the ride extremely bumpy and unstable. Children will feel very uncomfortable when they are swaying from side to side inside the stroller.

[0003] To address this issue, some strollers are equipped with shock-absorbing structures to improve comfort when traversing uneven surfaces.

[0004] In existing technologies, shock absorption structures are generally achieved by setting shock-absorbing springs on the wheel assembly. However, in some usage scenarios, such as when turning or traveling on roads with relatively large inclination angles, the overall rigidity of the wheel assembly is insufficient due to the setting of shock-absorbing springs, making the trolley prone to tipping over. Summary of the Invention

[0005] The purpose of this invention is to overcome one or more drawbacks in the prior art and provide a shock-absorbing structure that makes the stroller shock-absorbing and less prone to tipping over.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A seismic damping structure, comprising: The first one, The second seat is movable relative to the first seat, and has a contact part and a avoidance part; The shock-absorbing element is elastic and is supported between the first and second seats; A limiting member is disposed on the first seat and has a first position and a second position relative to the second seat. When the limiting member is in the first position, the end of the limiting member away from the first seat is opposite to the position of the clearance part, and there is a first movable space between the limiting member and the clearance part, so that the shock-absorbing element can elastically deform. When the limiting member is in the second position, the end of the limiting member away from the first seat is opposite to the position of the abutting part, and the limiting member abuts against the abutting part, or there is a second movable space between the limiting member and the abutting part, the second movable space being smaller than the first movable space, so as to limit the amount of elastic deformation of the shock-absorbing element.

[0007] In some embodiments, the clearance portion is a recess provided on the second seat; When the limiting member is in the first position, the limiting member is entirely located outside the recess, and at least the cavity of the recess forms the first active space; Alternatively, when the limiting member is in the first position, the limiting member is partially located in the recess, and the portion of the limiting member extending into the recess has a gap distance between it and each wall surface of the recess, the gap distance forming the first active space; Alternatively, the avoidance part may be a plane.

[0008] In some embodiments, the abutting portion is a flat surface located on the second seat, or the abutting portion is a protrusion provided on the second seat.

[0009] In some embodiments, the second seat is further provided with a connecting portion, which connects between the abutting portion and the clearance portion to drive the limiting member away from the clearance portion, and the connecting portion is an inclined surface that is inclined away from the clearance portion; Alternatively, an elastic element may be provided at the clearance portion. When the limiting member is in the first position, the elastic element applies an elastic force to the limiting member, so that the limiting member tends to move away from the clearance portion.

[0010] In some embodiments, the end of the limiting member away from the first seat is an arc surface or a plane; And / or, when the limiting member is in the first position, the limiting member extends in the vertical direction; And / or, the avoidance portion and the abutment portion have a height difference in the vertical direction.

[0011] In some embodiments, the first seat and the second seat are rotatably connected relative to each other about a first axis extending in the left-right direction. When the limiting member is in the first position, the first seat and the second seat can rotate relative to each other about the first axis by a first angle. When the limiting member is in the second position, the first seat is fixed relative to the second seat, or the first seat and the second seat can rotate relative to each other about the first axis by a second angle, the second angle being smaller than the first angle.

[0012] In some embodiments, the shock-absorbing element is sleeved outside the limiting member, and when the first seat and the second seat rotate relative to each other about the first axis, the shock-absorbing element undergoes elastic deformation along the length extension direction of the limiting member.

[0013] The present invention also provides a wheel assembly having a shock-absorbing structure as described in any of the preceding claims, wherein one of the first seat and the second seat includes a seat body and a wheel joint connected to the seat body, the other of the first seat and the second seat is rotatably connected to the seat body via a first shaft, the shock-absorbing element is disposed between the seat body and the other of the first seat and the second seat, and the wheel assembly further includes a wheel, the wheel being rotatably disposed on the other of the first seat and the second seat about a wheel axle.

[0014] In some embodiments, when the road surface where the wheel assembly is located is horizontal or has a first tilt angle A, the limiting member is in a first position; when the road surface where the wheel assembly is located has a second tilt angle B, the limiting member is in a second position, wherein the second tilt angle B is greater than the first tilt angle A.

[0015] In some embodiments, the first seat includes the seat body and the wheel joint, the wheel is rotatably disposed on the second seat about the wheel axle, the limiting member is rotatably disposed on the seat body, and the clearance portion and the abutment portion are arranged sequentially along the circumferential direction of the rotation of the limiting member; The limiting member is rotatably connected to the seat body via a second shaft, which extends in the front-back direction or the left-right direction. Alternatively, the limiting member is rotatably connected to the second seat via a ball joint.

[0016] In some embodiments, the abutting portion is disposed on at least one side of the clearance portion; The abutting parts are respectively located on the left and right sides and / or the front and rear sides of the avoidance part.

[0017] In some embodiments, the limiting member can maintain its vertical extension under its own weight when not subjected to other external forces. When the inclination angle of the road surface where the wheel assembly is located changes, the limiting member swings relative to the seat body between a first position and a second position under its own weight.

[0018] In some embodiments, the seat body has a centerline, and the limiting member is located on the side of the seat body away from the centerline.

[0019] In some embodiments, the seat body is fixedly connected to the wheel joint.

[0020] In some embodiments, A < 6°, 6° ≤ B ≤ 13°.

[0021] In some embodiments, the seat body and the wheel joint are rotatably connected by a third axis extending in the vertical direction. When the seat body rotates about the third axis relative to the wheel joint until the wheel joint extends in the horizontal direction, the limiting member is in a first position; when the seat body rotates about the third axis relative to the wheel joint until the wheel joint extends in the front-back direction, the limiting member is in a second position.

[0022] In some embodiments, the clearance portion and the abutment portion are arranged sequentially along the circumferential direction in which the seat body rotates relative to the wheel joint; The avoidance portion and the abutment portion are respectively provided on opposite sides of the wheel joint in the circumferential direction, and the avoidance portion and the abutment portion are staggered along the circumferential direction of the wheel joint. Adjacent avoidance portions and abutment portions are connected by a connecting portion.

[0023] In some embodiments, the limiting member is fixedly disposed on the first seat.

[0024] The present invention also provides a trolley, including a trolley frame, a front wheel assembly disposed at the front of the bottom of the trolley frame and a rear wheel assembly disposed at the rear of the bottom of the trolley frame, the rear wheel assemblies being disposed on the left and right sides respectively, at least one of the rear wheel assemblies being the wheel assembly described above, and the wheel joint being connected to the trolley frame.

[0025] The present invention also provides a trolley, including a trolley frame, a front wheel assembly disposed at the front of the bottom of the trolley frame, and a rear wheel assembly disposed at the rear of the bottom of the trolley frame, wherein at least the front wheel assembly is the wheel assembly described above, and the wheel joint is connected to the trolley frame.

[0026] The present invention also provides a trolley, including a trolley frame, a front wheel assembly disposed at the front of the bottom of the trolley frame, and a rear wheel assembly disposed at the rear of the bottom of the trolley frame. The front wheel assembly is the wheel assembly described in the above section, the rear wheel assembly is the wheel assembly described in the above section, the wheel joint of the front wheel assembly is connected to the front of the trolley frame, and the wheel joint of the rear wheel assembly is connected to the rear of the trolley frame.

[0027] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: When the limiting member is in the first position, the shock-absorbing structure provided by the present invention allows relative movement between the first seat and the second seat, thereby causing the shock-absorbing element to undergo elastic deformation, absorbing and storing impact energy, and converting the instantaneous impact into long-term reciprocating vibration, thereby achieving buffering and shock absorption effects; while when the limiting member is in the second position, the first seat and the second seat are relatively fixed, and the shock-absorbing element does not undergo elastic deformation, or although the first seat and the second seat can move relative to each other, the amplitude of the relative movement is small, and the shock-absorbing element only undergoes very small elastic deformation, making the shock-absorbing structure approximately a rigid structure with good rigidity, making the trolley with the shock-absorbing structure less prone to tipping over, and improving the safety of the trolley during use. Attached Figure Description

[0028] Appendix Figure 1 This is a side view of the trolley in Embodiment 1 after the trolley frame has been removed; Appendix Figure 2 For the appendix Figure 1 Cross-sectional view along the AA line (the road surface where the wheel assembly is located is horizontal); Appendix Figure 3 For the appendix Figure 2 Enlarged view of a portion of point A in the middle; Appendix Figure 4 For the appendix Figure 1 Cross-sectional view along line AA (the road surface where the wheel assembly is located is inclined at the second inclination angle B in the left and right directions). Appendix Figure 5 For the appendix Figure 4 Enlarged view of a portion of point A in the middle; Appendix Figure 6 For the appendix Figure 4 Enlarged view of a portion of point B in the middle; Appendix Figure 7 This is a side view of the trolley in Embodiment 1 when the wheel assembly is on a level surface; Appendix Figure 8 This is a side view of the trolley in this embodiment 1 when it is tilted at a second tilt angle B along the front-to-back direction on the road surface where the wheel assembly is located. Appendix Figure 9 For the appendix Figure 8 Enlarged view of a portion of point A in the middle; Appendix Figure 10 This is an exploded view of the wheel assembly in Embodiment 2; Appendix Figure 11 This is a top view of the wheel assembly in Embodiment 2 (the wheel axle extends in the left-right direction). Appendix Figure 12 For the appendix Figure 11 sectional view along line AA; Appendix Figure 13This is a top view of the wheel assembly in Embodiment 2 (the wheel axle extends in the front-to-back direction). Appendix Figure 14 For the appendix Figure 13 sectional view along line AA; Appendix Figure 15 For the appendix Figure 13 sectional view along line BB; Appendix Figure 16 This is a three-dimensional schematic diagram of the inner plug in Embodiment 2; Appendix Figure 17 This is a bottom view of the inner plug in Embodiment 2.

[0029] The components are as follows: 1. First seat; 2. Second seat; 21. Clearance part; 22. Abutment part; 23. Connecting part; 31. Seat body; 32. Wheel joint; 321. Housing; 322. Inner plug; 4. Shock absorber; 5. Limiting component; 61. First axle; 62. Second axle; 63. Third axle; 64. Ball joint; 7. Wheel; 71. Wheel axle; 81. Front bracket; 82. Rear bracket; 83. Push handle; 84. Push rod; 85. Support rod; 86. Front connecting rod; 87. Rear connecting rod; 88. Sliding component. Detailed Implementation

[0030] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] In the following description, the directions such as "front," "back," "left," "right," "up," and "down" are defined according to the conventional observation perspective of a person skilled in the art regarding the orientation of a trolley in its unfolded state, i.e., they are all based on... Figure 7 In the figure, the left direction is "front", the right direction is "back", the top direction is "up", and the bottom direction is "down". The directions perpendicular to the paper are "left" and "right". The above definitions of directions are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0032] Example 1 like Figures 1-8 As shown, the wheel assembly in this embodiment has a shock-absorbing structure. The shock-absorbing structure includes a first seat 1, a second seat 2, a shock-absorbing element 4, and a limiting member 5.

[0033] The first seat 1 and the second seat 2 can move relative to each other, and the shock-absorbing element 4 is supported between the first seat 1 and the second seat 2. The shock-absorbing element 4 is elastic and can undergo elastic deformation when it moves relative to the first seat 1 and the second seat 2. Through its elastic deformation, it converts the instantaneous impact into long-term reciprocating vibration, so as to alleviate the vibration transmitted from the wheel assembly to the trolley frame. The shock-absorbing element 4 can be a shock-absorbing spring, with its two ends abutting against the first seat 1 and the second seat 2 respectively.

[0034] Specifically, the first seat 1 and the second seat 2 are rotatably connected by a first shaft 61 extending in the left-right direction, causing the shock-absorbing element 4 to elastically deform when the first seat 1 and the second seat 2 rotate relative to each other. In other embodiments, the first seat 1 and the second seat 2 may also be slidably arranged relative to each other.

[0035] The limiting component 5 is used to limit the elastic deformation of the shock-absorbing component 4, so that when the trolley is used in certain specific situations, the wheel assembly is approximately a rigid component, thereby making the wheel assembly rigid. At the same time, the shock-absorbing component 4 has no deformation or the deformation range is almost zero, preventing the trolley frame from shaking and causing the center of gravity to change further, thus preventing the trolley from tipping to one side.

[0036] The second seat 2 has a clearance portion 21 and an abutment portion 22. One end of the limiting member 5 is disposed on the first seat 1. The limiting member 5 has a first position and a second position relative to the second seat 2.

[0037] like Figure 2 and Figure 3 As shown, when the limiting member 5 is in the first position, the end of the limiting member 5 away from the first seat 1 is opposite to the position of the avoidance part 21. At this time, there is a first movable space between the limiting member 5 and the avoidance part 21, so that the limiting member 5 will not block the relative rotation between the first seat 1 and the second seat 2. The first seat 1 and the second seat 2 can rotate relative to each other around the first axis 61 by a first angle. When the first seat 1 and the second seat 2 rotate relative to each other, the shock-absorbing element 4 undergoes elastic deformation, thereby absorbing and storing impact energy, and converting the instantaneous impact into long-term reciprocating vibration, thereby reducing the vibration transmitted from the wheel assembly to the trolley frame, achieving a buffering and shock absorption effect. The smaller the vibration when the trolley is in use, the smoother the trolley travels, the easier it is to control, and the better the user's pushing experience.

[0038] like Figure 4 and Figure 5As shown, when the limiting member 5 is in the second position, the end of the limiting member 5 away from the first seat 1 is opposite to the abutment part 22, and the limiting member 5 abuts against the abutment part 22. At this time, due to the obstruction of the limiting member 5, there is no relative rotation between the first seat 1 and the second seat 2, and the shock-absorbing element 4 does not undergo elastic deformation. Alternatively, there is a second movable space between the limiting member 5 and the abutment part, which is much smaller than the first movable space. In this case, although the first seat 1 and the second seat 2 can rotate relative to each other by a second angle, due to the restriction of the limiting member 5, the second angle is much smaller than the first angle, so the elastic deformation of the shock-absorbing element 4 is also smaller. In this way, the wheel assembly is approximately a rigid component, which makes the overall rigidity of the wheel assembly better and avoids the trolley from shaking due to spring compression, which would cause further changes in the center of gravity. This makes the trolley less likely to tip over and improves the safety of the trolley during use.

[0039] The clearance portion 21 is a recess provided on the second seat 2. When the limiting member 5 is in the first position, the limiting member 5 can be completely located outside the recess, at which time at least the cavity of the recess forms the aforementioned first movable space. When the first seat 1 and the second seat 2 rotate relative to each other, the limiting member 5 can partially extend into the recess and move within the recess.

[0040] Alternatively, when the limiting member 5 is in the first position, it may also be partially located in the recess. In this case, there is a gap between the portion of the limiting member 5 extending into the recess and each wall surface of the recess, and this gap forms the aforementioned first movable space. When the first seat 1 and the second seat 2 rotate relative to each other, the limiting member 5 can still move in the recess.

[0041] The abutting part 22 can be a flat surface located on the second seat 2, or the abutting part 22 can be a protrusion provided on the second seat 2.

[0042] A connecting portion 23 may also be provided on the second seat 2. The connecting portion 23 connects the clearance portion 21 and the abutment portion 22. The connecting portion 23 is an inclined surface that is inclined from the bottom of the recess in the clearance portion 21 to the top and away from the recess. By providing the connecting portion 23, when the limiting member 5 is located in the recess, when it rotates relative to the first seat 1 and the second seat 2, the limiting member 5 can be disengaged from the clearance portion 21 by the action of the connecting portion 23.

[0043] Of course, the connecting part 23 may not be provided on the second seat 2. By providing an elastic member in the recess, when the limiting member 2 is in the first position, the limiting member 5 abuts against the elastic member, causing the elastic member to undergo elastic deformation. Afterward, the limiting member 5 can be driven to disengage from the recess by the elastic force of the elastic member.

[0044] The end of the limiting member 5 away from the first seat 1 can be an arc surface, so that when the limiting member 5 switches between the first position and the second position, the limiting member 5 can avoid jamming with the abutting part 22, and can also reduce the friction between the limiting member 5 and the abutting part 22, and reduce the wear of the limiting member 5 and the abutting part 22.

[0045] Of course, the end of the limiting member 5 away from the first seat 1 can also be a plane, which can increase the contact area between the limiting member 5 and the abutment part 22, so that the limiting member 5 is stably held in the second position, thereby maintaining better rigidity of the wheel assembly.

[0046] The shock-absorbing element 4 is sleeved on the outside of the limiting member 5. When the first seat 1 and the second seat 2 rotate relative to each other around the first axis 61, the shock-absorbing element 4 undergoes elastic deformation along the length extension direction of the limiting member 5. This makes the wheel assembly compact and small in size.

[0047] Of course, the shock-absorbing element 4 and the limiting element 5 can also be set independently.

[0048] The wheel assembly also includes a wheel 7. One of the first seat 1 and the second seat 2 includes a seat body 31 and a wheel joint 32. The other of the seat body 31, the first seat 1 and the second seat 2 is rotatably connected by a first shaft 61. The shock-absorbing element 4 is disposed between the seat body 31 and the other of the first seat 1 and the second seat 2. The wheel 7 is rotatably disposed on the other of the first seat 1 and the second seat 2 around the wheel axle 71.

[0049] In this embodiment, the first seat 1 includes a seat body 31 and a wheel joint 32. A shock-absorbing element 4 is disposed between the seat body 31 and the second seat 2. A wheel 7 is rotatably mounted on the second seat 2 around an axle 71. Figures 1-9 As shown.

[0050] When the wheel assembly is on a level surface or has a first tilt angle A, the limiting member 5 is in the first position, such as... Figure 2 and Figure 3 As shown in the figure, when the road surface where the wheel assembly is located has a second tilt angle B, the limiting member 5 is in the second position, and the second tilt angle B is greater than the first tilt angle A, as shown in the figure. A < 6°, 6° ≤ B ≤ 13°.

[0051] The limiting member 5 is rotatably mounted on the seat body 31, and the clearance part 21 and the abutting part 22 are arranged sequentially along the circumferential direction of the rotation of the limiting member 5, with the abutting part 21 located on at least one side of the clearance part 22.

[0052] When the limiting member 5 is in the first position, the lowest end of the limiting member 5 and the highest end of the abutment part 22 are approximately at the same height. Alternatively, the lowest end of the limiting member 5 is slightly higher than the highest end of the abutment part 22, and the distance between the two must ensure that when the road surface where the wheel assembly is located has a second inclination angle B, the limiting member 5 can abut against the abutment part 22.

[0053] The limiting member 5 and the seat body 31 can be rotatably connected by the second shaft 62, which extends in the front-back direction or the left-right direction.

[0054] In this embodiment, the limiting member 5 can maintain its vertical extension under its own weight when not subjected to other external forces. When the road surface where the wheel assembly is located is horizontal or has a first inclination angle A, the limiting member 5 maintains a vertical or approximately vertical direction under its own weight, and the clearance part 21 is located below the limiting member 5. When the road surface where the wheel assembly is located has a second inclination angle B, the limiting member 5 swings around the second axis 62 to a second position under its own weight, and the abutment part 22 is located below the limiting member 5. At this time, the limiting member 5 can extend vertically, or the shock-absorbing element 4 may be sleeved on the outside of the limiting member 5, so that the shock-absorbing element 4 restricts the swing of the limiting member 5, causing the limiting member 5 to tilt at a certain angle relative to the vertical direction. That is, when the inclination angle of the road surface where the wheel assembly is located changes, the limiting member 5 swings relative to the seat body 31 around the second axis 62 and switches between the first position and the second position under its own weight.

[0055] Thus, when the road surface where the wheel assembly is located is tilted in the left-right direction, the second axle 62 extends in the front-back direction, and the abutment portion 21 can be located on the left and / or right side of the avoidance portion 22, such as... Figures 2-6 As shown. When the road surface where the wheel assembly is located is inclined in the front-to-back direction, the second axle 62 extends in the left-to-right direction, and the abutment portion 21 can be provided on the front side and / or rear side of the avoidance portion 22, such as... Figure 8 and Figure 9 As shown.

[0056] Preferably, the limiting member 5 is rotatably connected to the seat body 31 via a ball joint 64, and the abutment portions 22 are respectively provided on the left and right sides and the front and rear sides of the clearance portion 21. In this way, regardless of whether the road surface where the wheel assembly is located is tilted in the left-right or front-rear direction, the limiting member 5 can move to the second position under its own gravity.

[0057] The ball joint 64 includes a ball head disposed on one of the limiting member 5 and the seat body 31 and a ball socket disposed on the other, with the ball head rotatably disposed in the ball socket.

[0058] In this embodiment, the abutting part 22 is a protrusion provided on the second seat 2, and the protrusion and the concave part are provided adjacent to each other, that is, the side of the protrusion facing the concave part forms a side wall of the concave part.

[0059] The seat body 31 has a center line, and the limiting member 5 is eccentrically positioned relative to the center line of the seat body 31. Specifically, the limiting member 5 is located on the side of the seat body 31 away from the center line from the wheel 7. When the wheel assembly is used in a trolley, this arrangement makes the trolley structure compact. Of course, the limiting member 5 can also be non-eccentrically positioned.

[0060] In this embodiment, the seat body 31 and the wheel joint 32 are fixedly connected, or they can be set as one piece.

[0061] This embodiment also provides a trolley, which includes a trolley frame, a front wheel assembly disposed at the bottom front of the trolley frame, and a rear wheel assembly disposed at the bottom rear of the trolley frame, with the rear wheel assemblies respectively disposed on the left and right sides.

[0062] In this embodiment, at least the rear wheel assembly located at the lower position is the wheel assembly of this embodiment. Preferably, both the left and right rear wheel assemblies are wheel assemblies of this embodiment. Among the left and right wheel assemblies, the second seat 2 can be integrally set or each can be set independently.

[0063] When the trolley is on a level surface or at a first tilt angle A, the second seat 2 in both the left and right wheel assemblies can rotate relative to the first seat 1 around the first axle 61, such as... Figure 2 As shown. The road surface tilt here includes both a sloping surface and a stepped surface, where the left and right wheel assemblies are on different levels of the road surface, or the front and rear wheel assemblies are on steps of different levels, causing the trolley to tilt as a whole.

[0064] When the road surface where the trolley is located has a second inclination angle B, at least the second seat 2 in the lower wheel assembly cannot rotate relative to the first seat 1 about the first axle 61, or can only rotate relative to the first seat 1 about the first axle 61 by a small angle, such as... Figure 4 and Figure 8 As shown.

[0065] In this embodiment, when the road surface where the trolley is located is tilted at a second tilt angle B in the left-right direction, in the wheel assembly located at the higher position, since the abutment part 22 is located on one side of the avoidance part 21, the limiting member 5 swings away from the abutment part 22 under its own weight, thus preventing it from abutting against the abutment part 22. At this time, in the wheel assembly, the second seat 2 can still rotate relative to the first seat 1, such as... Figure 4 and Figure 6 As shown.

[0066] When the road surface where the trolley is located is tilted at a second tilt angle B in the front-to-back direction, both the left and right rear wheel assemblies are at their lowest positions. In both left and right rear wheel assemblies, the second seat 2 cannot rotate relative to the first seat 1 around the first axle 61, or can only rotate a small angle relative to the first seat 1 around the first axle 61. Figure 8 As shown.

[0067] This embodiment provides a structure for a trolley frame, but the trolley frame is not limited to the structure given in this embodiment.

[0068] like Figure 7 and Figure 8 As shown, the cart frame includes a front support 81, a rear support 82, a push handle 83, a push rod 84, a support rod 85, and a connecting rod assembly.

[0069] The lower part of the push handle 83 is rotatably connected to the upper part of the push rod 84. Two of the three parts—the upper part of the front bracket 81, the upper part of the rear bracket 82, and the lower part of the push rod 84—are rotatably connected, and the third part is rotatably connected to either of the aforementioned two parts, or the aforementioned three parts are coaxially rotatably connected.

[0070] One end of the strut 85 is rotatably connected to the lower part of the push handle 83, and the strut 85 is rotatably connected to the rear bracket 82.

[0071] The linkage assembly is rotatably connected to the front bracket 81 and rotatably connected to the other end of the strut 85.

[0072] The linkage assembly may include a front link 86 and a rear link 87. One end of the front link 86 is rotatably connected to a front bracket 81, one end of the rear link 87 is rotatably connected to a rear bracket 82, and the other end of the front link 86 is rotatably connected to the other end of the rear link 87.

[0073] The other end of the strut 85 is rotatable and can slide along the extension direction of the rear link 87.

[0074] Specifically, the linkage assembly also includes a slider 88, which is slidably disposed on the rear link 87 along the extension direction of the rear link 87, and the other end of the support rod 85 is rotatably connected to the slider 88.

[0075] The aforementioned wheel assemblies are respectively installed on the lower part of the rear brackets 82 on the left and right sides, and the wheel joints 32 are connected to the lower part of the rear brackets 82.

[0076] Example 2 In this embodiment, the seat body 31 and the wheel joint 32 are rotatably connected by a third shaft 63 extending in the vertical direction. During the use of the trolley, when the seat body 31 rotates around the third shaft 63 relative to the wheel joint 32, the entire assembly formed by the seat body 31, the components of the first seat 1 and the second seat 2 without the seat body 31, the shock-absorbing element 4, and the wheel 7 rotates synchronously around the third shaft 63 relative to the wheel joint 32, thereby turning the trolley.

[0077] In this embodiment, the second seat 2 includes a seat body 31 and a wheel joint 32. A shock-absorbing element 4 is disposed between the seat body 31 and the first seat 1. A wheel 7 is rotatably mounted on the first seat 1 around an axle 71. Figures 10-17 As shown.

[0078] By rotating the seat body 31 relative to the wheel joint 32 about the third axis 63, the limiting member 5 is switched between the first position and the second position.

[0079] When the seat body 31 rotates relative to the wheel joint 32 around the third axis 63 until the wheel axle 71 extends in the left-right direction, the limiting member 5 is in the first position. The left-right direction mentioned here can be a range of forward and backward tilting angles, such as... Figure 11 and Figure 12 As shown, this is the normal driving state of the stroller. In this state, the first seat 1 can rotate relative to the second seat 2 around the first axle 61. When the wheel assembly is driving normally on uneven surfaces, the impact of the wheel 7 is transmitted to the first seat 1, causing it to rotate relative to the second seat 2 around the first axle 61. This causes the shock-absorbing element 4 to undergo elastic deformation, thereby absorbing and storing impact energy and converting the instantaneous impact into long-term reciprocating vibration. This reduces the vibration transmitted from the wheel 7 to the stroller frame, improving the stroller's riding comfort and safety. Furthermore, the less vibration during stroller use, the smoother the stroller's movement, the easier it is to control, and the better the user's pushing experience.

[0080] When the seat body 31 rotates relative to the wheel joint 32 around the third axis 63 until the wheel axle 71 extends in the front-rear direction, the limiting member 5 is in the second position. The front-rear direction mentioned here can be a range of tilting to the left and right at a certain angle, such as... Figures 13-15 As shown. This state represents the most unfavorable position of the stroller. At this time, the first seat 1 cannot rotate relative to the second seat 2 around the first axis 61, and the shock-absorbing element 4 does not undergo elastic deformation. Alternatively, the first seat 1 can only rotate a small angle relative to the second seat 2 around the first axis 61, and the shock-absorbing element 4 undergoes small elastic deformation. The wheel assembly is approximately a rigid component, resulting in good overall rigidity of the wheel assembly and preventing the stroller from swaying due to spring compression, which would further change the center of gravity. This makes the stroller less likely to tip over and improves the safety of using the stroller.

[0081] In this embodiment, the limiting member 5 is fixedly disposed on the first seat 1. The clearance part 21 and the abutment part 22 are arranged sequentially along the circumferential direction of the seat body 31 relative to the wheel joint 32. Specifically, as follows... Figure 16 and Figure 17 As shown, the avoidance part 21 and the abutment part 22 are respectively provided on opposite sides of the wheel joint 32 in the circumferential direction, and the avoidance part 21 and the abutment part 22 are staggered along the circumferential direction of the wheel joint 32. Adjacent avoidance parts 21 and abutment parts 22 are connected by a connecting part 23.

[0082] In this embodiment, the wheel joint 32 includes a housing 321 connected to the trolley frame and an inner plug 322 embedded inside the housing 321. The seat body 31 and the inner plug 322 are rotatably connected via a third shaft 63. The clearance portion 21, the abutment portion 22, and the connecting portion 23 are all located at the end of the inner plug 322 facing the seat body 31, as shown below. Figure 10 , Figure 12 , Figures 14-17 As shown.

[0083] In this embodiment of the trolley, when only the front wheel assembly is a swivel wheel, only the front wheel assembly uses the wheel assembly of this embodiment. When both the front wheel assembly and the rear wheel assembly are swivel wheels, both the front wheel assembly and the rear wheel assembly can use the wheel assembly of this embodiment.

[0084] Example 3 In this embodiment of the trolley, the front wheel assembly is a swivel wheel, and the front wheel assembly adopts the wheel assembly of Embodiment 2. The rear wheel assemblies on both the left and right sides are fixed wheels, and the rear wheel assemblies on both sides adopt the wheel assembly of Embodiment 1.

[0085] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A shock-absorbing structure, characterized in that: include: The first one, The second seat is movable relative to the first seat, and has a contact part and a avoidance part; The shock-absorbing element is elastic and is supported between the first and second seats; A limiting member is disposed on the first seat and has a first position and a second position relative to the second seat; When the limiting member is in the first position, the end of the limiting member away from the first seat is opposite to the position of the clearance part, and there is a first movable space between the limiting member and the clearance part, so that the shock-absorbing element can be elastically deformed; when the limiting member is in the second position, the end of the limiting member away from the first seat is opposite to the position of the abutting part, and the limiting member abuts the abutting part, or there is a second movable space between the limiting member and the abutting part, the second movable space being smaller than the first movable space, so as to limit the amount of elastic deformation of the shock-absorbing element.

2. The shock-absorbing structure according to claim 1, characterized in that: The clearance portion is a recess provided on the second seat; When the limiting member is in the first position, the limiting member is entirely located outside the recess, and at least the cavity of the recess forms the first active space; Alternatively, when the limiting member is in the first position, the limiting member is partially located in the recess, and the portion of the limiting member extending into the recess has a gap distance between it and each wall surface of the recess, the gap distance forming the first active space; Alternatively, the avoidance part may be a plane.

3. The shock-absorbing structure according to claim 1, characterized in that: The abutting part is a flat surface located on the second seat, or the abutting part is a protrusion provided on the second seat.

4. The shock-absorbing structure according to claim 1, characterized in that: The second seat is also provided with a connecting part, which connects between the abutting part and the clearance part to drive the limiting member away from the clearance part. The connecting part is an inclined surface that is inclined away from the clearance part. Alternatively, an elastic element may be provided at the clearance portion. When the limiting member is in the first position, the elastic element applies an elastic force to the limiting member, so that the limiting member tends to move away from the clearance portion.

5. The shock-absorbing structure according to claim 1, characterized in that: The end of the limiting member away from the first seat is an arc surface or a plane; And / or, when the limiting member is in the first position, the limiting member extends in the vertical direction; And / or, the avoidance portion and the abutment portion have a height difference in the vertical direction.

6. The shock-absorbing structure according to any one of claims 1 to 5, characterized in that: The first seat and the second seat are rotatably connected relative to each other about a first axis extending in the left-right direction. When the limiting member is in the first position, the first seat and the second seat can rotate relative to each other about the first axis by a first angle. When the limiting member is in the second position, the first seat is fixed relative to the second seat, or the first seat and the second seat can rotate relative to each other about the first axis by a second angle, the second angle being smaller than the first angle.

7. The shock-absorbing structure according to claim 6, characterized in that: The shock-absorbing element is sleeved on the outside of the limiting member. When the first seat and the second seat rotate relative to each other around the first axis, the shock-absorbing element undergoes elastic deformation along the length extension direction of the limiting member.

8. A wheel assembly, characterized in that: The shock-absorbing structure has any one of claims 1 to 7, wherein one of the first seat and the second seat includes a seat body and a wheel joint connected to the seat body, the other of the first seat and the second seat is rotatably connected to the seat body via a first shaft, the shock-absorbing element is disposed between the seat body and the other of the first seat and the second seat, and the wheel assembly further includes a wheel, the wheel being rotatably disposed on the other of the first seat and the second seat about a wheel axle.

9. The wheel assembly according to claim 8, characterized in that: When the road surface where the wheel assembly is located is horizontal or has a first tilt angle A, the limiting member is in a first position; when the road surface where the wheel assembly is located has a second tilt angle B, the limiting member is in a second position, where the second tilt angle B is greater than the first tilt angle A.

10. The wheel assembly according to claim 9, characterized in that: The first seat includes the seat body and the wheel joint. The wheel is rotatably mounted on the second seat around the wheel axle. The limiting member is rotatably mounted on the seat body. The clearance portion and the abutment portion are arranged sequentially along the circumferential direction of the rotation of the limiting member. The limiting member is rotatably connected to the seat body via a second shaft, which extends in the front-back direction or the left-right direction. Alternatively, the limiting member is rotatably connected to the second seat via a ball joint.

11. The wheel assembly according to claim 10, characterized in that: The abutting portion is disposed on at least one side of the clearance portion; The abutting parts are respectively located on the left and right sides and / or the front and rear sides of the avoidance part.

12. The wheel assembly according to claim 10, characterized in that: When not subjected to other external forces, the limiting member can maintain its vertical extension under its own weight. When the inclination angle of the road surface where the wheel assembly is located changes, the limiting member swings relative to the seat body between a first position and a second position under its own weight.

13. The wheel assembly according to claim 9, characterized in that: The seat body has a center line, and the limiting member is located on the side of the seat body away from the center line.

14. The wheel assembly according to claim 9, characterized in that: The seat body is fixedly connected to the wheel joint.

15. The wheel assembly according to claim 9, characterized in that: A < 6°, 6° ≤ B ≤ 13°.

16. The wheel assembly according to claim 8, characterized in that: The seat body and the wheel joint are rotatably connected by a third axis extending in the vertical direction. When the seat body rotates about the third axis relative to the wheel joint until the wheel joint extends in the horizontal direction, the limiting member is in the first position; when the seat body rotates about the third axis relative to the wheel joint until the wheel joint extends in the front-back direction, the limiting member is in the second position.

17. The wheel assembly according to claim 16, characterized in that: The clearance portion and the abutment portion are arranged sequentially along the circumferential direction in which the seat body rotates relative to the wheel joint; The avoidance portion and the abutment portion are respectively provided on opposite sides of the wheel joint in the circumferential direction, and the avoidance portion and the abutment portion are staggered along the circumferential direction of the wheel joint. Adjacent avoidance portions and abutment portions are connected by a connecting portion.

18. The wheel assembly according to claim 15, characterized in that: The limiting component is fixedly mounted on the first seat.

19. A trolley, characterized in that: The trolley includes a trolley frame, a front wheel assembly disposed at the front of the bottom of the trolley frame, and a rear wheel assembly disposed at the rear of the bottom of the trolley frame. The rear wheel assemblies are respectively disposed on the left and right sides, and at least one of the rear wheel assemblies is a wheel assembly as described in any one of claims 9 to 15. The wheel joint is connected to the trolley frame.

20. A trolley, characterized in that: It includes a trolley frame, a front wheel assembly disposed at the front of the bottom of the trolley frame, and a rear wheel assembly disposed at the rear of the bottom of the trolley frame, wherein at least the front wheel assembly is the wheel assembly of any one of claims 16 to 18, and the wheel joint is connected to the trolley frame.

21. A trolley, characterized in that: The device includes a trolley frame, a front wheel assembly disposed at the front of the bottom of the trolley frame, and a rear wheel assembly disposed at the rear of the bottom of the trolley frame. The front wheel assembly is the wheel assembly according to any one of claims 16 to 18, and the rear wheel assembly is the wheel assembly according to any one of claims 9 to 15. The wheel joint of the front wheel assembly is connected to the front of the trolley frame, and the wheel joint of the rear wheel assembly is connected to the rear of the trolley frame.

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