Low-noise shock absorption structure and balance car

Abstract

The utility model discloses a low-noise shock-proof structure and a balance car, the low-noise shock-proof structure comprises a working liquid cylinder, a piston, a piston rod and a damping adjusting part, the damping adjusting part is arranged in a third liquid cavity, and the damping adjusting part comprises a damping adjusting rod and a damping adjusting seat; a damping hole is formed in the damping adjusting seat, one end of the damping adjusting rod is fixedly connected with an inserting part, and the inserting part is inserted into the damping hole; a liquid passing gap is formed between the outer circumferential surface of the inserting part and the inner circumferential surface of the damping hole, and the second liquid cavity to the third liquid cavity hydraulic channel are communicated through the liquid passing gap; the cross section of the liquid passing gap is non-uniform on the plane perpendicular to the axis of the damping hole. According to the low-noise shock-proof structure, the shape of the liquid passing gap is changed, and the cross section of the liquid passing gap is not equally divided, so that in the working process of the shock-proof structure, hydraulic impact force borne by the damping adjusting rod is not uniform, and the resonance problem of the damping adjusting rod is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of balancing vehicles, and in particular to a low-noise shock-absorbing structure and a balancing vehicle. Background Art

[0002] The shock absorber structure is an essential component of a self-balancing scooter, significantly improving its comfort and extending its service life. The shock absorber structure often includes a damping adjustment rod. Adjusting the damping adjustment rod changes the damping of the shock absorber structure, thereby cushioning the scooter's vibrations. In the prior art, the damping adjustment rod has a tapered front end and is inserted into a damping adjustment seat with a cylindrical hole. The damping level is adjusted by varying the depth of the tapered portion of the damping adjustment rod within the cylindrical hole. The gap between the outer circumference of the tapered surface and the inner wall of the cylindrical hole is uniform and symmetrical. During operation, hydraulic oil passes between the tapered surface and the inner wall of the cylindrical hole, impacting the tapered surface. The impact force is uniform at all locations on the tapered surface, causing resonance in the damping adjustment rod. The gap between the outer circumference of the tapered surface and the inner wall of the cylindrical hole produces an unusual sound, which not only reduces the service life of the shock absorber structure but also creates noise during operation, degrading the user experience. Utility Model Content

[0003] In order to overcome at least one of the defects described in the above-mentioned prior art, one of the purposes of the present utility model is to provide a low-noise shock-absorbing structure. By changing the shape of the liquid gap, the cross-section of the liquid gap is unevenly distributed on the plane perpendicular to the axis of the damping hole, so that the hydraulic impact force on the damping adjustment rod is uneven during the operation of the shock-absorbing structure, thereby overcoming the resonance problem of the damping adjustment rod and reducing the noise when the hydraulic oil passes through the liquid gap.

[0004] In order to overcome at least one of the defects described in the above-mentioned prior art, the second purpose of the present utility model is to provide a balance vehicle. The balance vehicle has the aforementioned low-noise shock-absorbing structure, so that the balance vehicle has low noise, low failure rate, long service life and low cost during use.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A low-noise shock-absorbing structure, comprising:

[0007] A working fluid cylinder having a cylindrical inner cavity;

[0008] a piston, the piston being slidably disposed in the cylindrical inner cavity of the working fluid cylinder and dividing the cylindrical inner cavity into a first liquid cavity and a second liquid cavity;

[0009] a piston rod connected to the piston and driving the piston to slide in the cylindrical inner cavity, wherein the piston rod has a third liquid cavity, the first liquid cavity and the second liquid cavity are in communication, or the first liquid cavity and the third liquid cavity are in communication;

[0010] A damping adjustment portion is arranged in the third liquid chamber, and the damping adjustment portion includes a damping adjustment rod and a damping adjustment seat; a damping hole is provided on the damping adjustment seat, and one end of the damping adjustment rod is fixedly connected to a plug-in portion, and the plug-in portion is inserted into the damping hole; a liquid gap is provided between the outer peripheral surface of the plug-in portion and the inner peripheral surface of the damping hole, and the liquid gap conducts the hydraulic channel from the second liquid chamber to the third liquid chamber; the cross-section of the liquid gap shows unevenness along a plane perpendicular to the axis of the damping hole.

[0011] Furthermore, the damping adjustment rod can move relative to the damping adjustment seat along its own axial direction, thereby changing the insertion depth of the plug-in portion into the damping hole and changing the effective liquid flow area of ​​the liquid flow gap.

[0012] Furthermore, the damping hole is a cylindrical hole.

[0013] Furthermore, the outer peripheral surface of the plug-in portion includes at least one inclined plane, and the cross-section of the plug-in portion exhibits asymmetry on at least one symmetry axis.

[0014] Furthermore, the inclined plane is a flow-facing surface.

[0015] Furthermore, a first liquid hole is provided on the piston, and the first liquid hole communicates with the first liquid cavity and the second liquid cavity.

[0016] Furthermore, the piston is further provided with a second liquid hole, the second liquid hole being a hydraulic passage connecting the third liquid chamber to the second liquid chamber;

[0017] A one-way valve is provided on the second liquid passage hole, and the one-way valve conducts a hydraulic passage from the second liquid passage hole to the third liquid chamber and the second liquid chamber.

[0018] Furthermore, the one-way valve includes a valve plate, the damping adjustment seat is screwed to the piston rod, and the damping adjustment seat clamps the valve plate at the end of the second liquid hole facing the second liquid chamber.

[0019] Furthermore, a first blocking piece is fixed to one end of the working fluid cylinder, and a second blocking piece is fixed to the other end, the first blocking piece is arranged toward the plug-in portion, the piston is fixed to one end of the piston rod, and the other end of the piston rod is passed through the second blocking piece; a rubber plug is provided on the first blocking piece, and the rubber plug is used to abut and seal the damping hole.

[0020] A balancing vehicle having the aforementioned low-noise shock-absorbing structure.

[0021] In summary, the low-noise shock-absorbing structure provided by the present invention has the following technical effects:

[0022] 1. By changing the shape of the liquid gap, the cross-section of the liquid gap is unevenly distributed along the plane perpendicular to the axis of the damping hole. As a result, the hydraulic impact force on the damping adjustment rod during the operation of the shock absorber structure is uneven, overcoming the resonance problem caused by the uniform hydraulic impact force on the damping adjustment rod, extending the service life of the shock absorber structure, and at the same time reducing the noise when the hydraulic oil passes through the liquid gap, thereby improving the user experience of the shock absorber structure.

[0023] 2. The outer peripheral surface of the plug-in part includes at least one inclined plane, and the cross-section of the plug-in part shows asymmetry on at least one symmetry axis. That is, the structure of the plug-in part is changed so that the liquid gap formed between the outer peripheral surface of the plug-in part and the inner wall of the damping hole is uniform, so that the hydraulic impact on the inclined plane of the plug-in part is uneven, thereby avoiding resonance of the plug-in part.

[0024] 3. The setting of the one-way valve forms a rebound oil circuit to ensure the normal operation of the shock absorber structure.

[0025] In summary, the balancing vehicle provided by the present invention has the following technical effects:

[0026] The balancing vehicle has the aforementioned low-noise shock-absorbing structure, which makes the balancing vehicle quiet, has a low failure rate, a long service life, and low cost of use during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a structural diagram of an embodiment of a low-noise shock-absorbing structure of the utility model.

[0028] Figure 2 This is a longitudinal sectional view of a low-noise shock-absorbing structure of the utility model.

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0030] Figure 4 This is the state diagram when the piston rod is pressed down.

[0031] Figure 5 Schematic diagrams of the structures of four embodiments of liquid gaps.

[0032] The meanings of the reference numerals are as follows:

[0033] 1. Working fluid cylinder; 11. First liquid chamber; 12. Second liquid chamber; 2. Piston; 21. First liquid hole; 22. Second liquid hole; 23. One-way valve; 3. Piston rod; 31. Third liquid chamber; 4. Damping adjustment part; 41. Damping adjustment rod; 411. Connecting part; 412. Inclined plane; 42. Damping adjustment seat; 421. Damping hole; 43. Liquid gap; 5. First blocking member; 6. Second blocking member. DETAILED DESCRIPTION

[0034] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] See Figure 1 and Figure 2 , the utility model discloses a low-noise shock-absorbing structure.

[0038] A low-noise shock-absorbing structure comprises a working fluid cylinder 1, a piston 2, a piston rod 3 and a damping adjustment part 4.

[0039] The working fluid cylinder 1 has a cylindrical inner cavity which serves as a mounting cavity for the piston 2 and the like and also as a working hydraulic oil cavity.

[0040] The piston 2 is slidably arranged in the cylindrical inner cavity of the working fluid cylinder 1, and divides the cylindrical inner cavity into a first liquid chamber 11 and a second liquid chamber 12. The piston rod 3 is connected to the piston 2 and drives the piston 2 to slide in the cylindrical inner cavity. The piston rod 3 has a third liquid chamber 31. The first liquid chamber 11 and the second liquid chamber 12 are connected or the first liquid chamber 11 and the third liquid chamber 31 are connected. In this solution, preferably, the first liquid chamber 11 and the second liquid chamber 12 are connected and the third liquid chamber 31 is connected to the second liquid chamber 12.

[0041] The damping adjustment unit 4 is disposed within the third fluid chamber 31 and includes a damping adjustment rod 41 and a damping adjustment seat 42. A damping orifice 421 is provided on the damping adjustment seat 42. A plug-in portion 411 is fixedly connected to one end of the damping adjustment rod 41, which is inserted into the damping orifice 421. A fluid-passing gap 43 is defined between the outer circumference of the plug-in portion 411 and the inner circumference of the damping orifice 421. This fluid-passing gap 43 connects the hydraulic passage from the second fluid chamber 12 to the third fluid chamber 31. The cross-section of the fluid-passing gap 43 exhibits an uneven distribution along a plane perpendicular to the axis of the damping orifice 421.

[0042] Based on the above solution, there is a liquid gap 43 between the outer circumference of the plug-in portion 411 and the inner circumference of the damping hole 421, and the liquid gap 43 conducts the hydraulic passage from the second liquid chamber 12 to the third liquid chamber 31. Figure 3 and Figure 4 From the perspective shown, when piston 2 and piston rod 3 move downward, piston 2 compresses second liquid chamber 12, causing its volume to decrease in real time and the hydraulic pressure within second liquid chamber 12 to increase. Some of the hydraulic oil in second liquid chamber 12 flows through first liquid hole 21 into first liquid chamber 11, while some flows through liquid gap 43 into third liquid chamber 31. This compression of the hydraulic oil provides cushioning for piston rod 3, fulfilling the function of the shock-absorbing structure.

[0043] Based on the description above, when the hydraulic oil in the second liquid chamber 12 enters the third liquid chamber 31 through the fluid gap 43, the connector 411 on the damping adjustment rod 41 is impacted by the high-pressure hydraulic oil. At this point, because the cross-section of the fluid gap 43 exhibits uneven distribution along a plane perpendicular to the axis of the damping orifice 421, i.e., the instantaneous amount of hydraulic oil passing through at least one location within the fluid gap 43 differs from that at one or more other locations, the hydraulic oil impact force on at least one location on the outer circumference of the connector 411 differs from that at other locations. This means that the hydraulic oil impact force on the outer circumference of the connector 411 is uneven. This effectively prevents resonance in the connector 411, reduces vibration of the connector 411, and also reduces noise generated at the fluid gap 43.

[0044] That is, in the present technical solution, by changing the shape of the liquid gap 43, the cross-section of the liquid gap 43 is unevenly distributed on the plane perpendicular to the axis of the damping hole, so that the hydraulic impact force on the damping adjustment rod 41 is uneven during the operation of the shock-absorbing structure, thereby overcoming the resonance problem caused by the symmetrical and uniform hydraulic impact force on the damping adjustment rod 41, extending the service life of the shock-absorbing structure, and at the same time reducing the noise when the hydraulic oil passes through the liquid gap 43, thereby improving the experience during the use of the shock-absorbing structure.

[0045] The uneven distribution can be, for example, a single area on one side of the center of the damping orifice with reference to the center of the damping orifice; or a plurality of areas arranged circumferentially around the center of the damping orifice, in which case the plurality of areas are not uniformly arranged circumferentially around the center of the damping orifice; or an annular area surrounding the center of the damping orifice, in which case the annular area is asymmetric or not uniformly arranged circumferentially around the center of the damping orifice; or other unspecified situations. This is to achieve the purpose of "making the impact force exerted by the hydraulic oil on the outer wall of the plug 411 uneven, thereby preventing the plug 411 from resonating."

[0046] In this technical solution, the damping adjustment rod 41 is movable along its own axis. This movement relative to the damping adjustment seat changes the insertion depth of the inserting portion 411 into the damping orifice 421, thereby varying the effective fluid flow area of ​​the fluid flow gap 43. By varying the effective fluid flow area of ​​the fluid flow gap 43, the instantaneous flow rate of hydraulic oil from the second fluid chamber 12 into the third fluid chamber 31 is altered, thereby varying the resistance experienced by the piston 2 during its sliding motion, thereby adjusting the buffer damping.

[0047] In the above technical solution, by adjusting the damping adjustment rod 41 along the axial direction of the damping adjustment rod 41, the depth of the plug-in portion 411 inserted into the damping hole 421 is changed, thereby changing the effective liquid flow area of ​​the liquid flow gap 43, and the adjustment is convenient and simple.

[0048] In this technical solution, to simplify the structure, the damping hole 421 is formed into a cylindrical hole, which facilitates the processing and forming of the damping adjustment seat 42, and also facilitates the installation of the damping adjustment rod 41 and the damping adjustment seat 42, and facilitates the adjustment of the effective liquid flow area of ​​the liquid flow gap 43 by adjusting the insertion depth of the damping adjustment rod 41. In addition, by forming the damping hole 421 into a cylindrical hole, when it is necessary to satisfy the requirement that the cross section of the liquid flow gap 43 exhibits unevenness along a plane perpendicular to the axis of the damping hole, it can be achieved by simply changing the outer peripheral surface shape of the plug-in portion 411, thereby reducing the variables of the cross section change of the liquid flow gap 43, facilitating the adjustment of the liquid flow gap 43, and further facilitating the control of the unevenness of the cross section of the liquid flow gap 43 along a plane perpendicular to the axis of the damping hole.

[0049] In this technical solution, the outer peripheral surface of the plug-in portion 411 includes at least one inclined plane 412 , and the cross section of the plug-in portion 411 exhibits unevenness along a plane perpendicular to the axis of the damping hole.

[0050] like Figure 5 As shown, Figure 5 (a), (b), (c), and (d) in FIG. 4 respectively show cross-sectional views of several plug-in portions 411 and also show cross-sectional views of several liquid-passing gaps 43. Figure 5 As shown in (a), (b), (c) and (d), the plug-in portion 411 is obtained by cutting the outer circumference of a cylinder by several planes. There is at least one inclined surface in the plane of the cut cylinder to form an inclined plane 412. The inclined plane 412 serves as the front face. By changing the gap between the inclined plane 412 and the inner wall of the cylindrical hole, the size of the liquid gap 43 is changed to achieve damping adjustment.

[0051] The cylindrical design of the damping hole 421 in the connector 411 creates an uneven cross-section of the liquid-passing gap 43 along a plane perpendicular to the axis of the damping hole. This creates an uneven impact force on the outer wall of the connector 411 as the hydraulic oil passes through the liquid-passing gap 43, preventing resonance in the connector 411.

[0052] In this technical solution, the inclined plane 412 is the flow-facing surface. By moving the damping adjustment rod 41 along the axial direction of the damping adjustment rod 41, the damping adjustment rod 41 moves relative to the damping adjustment seat, changing the depth of the plug-in portion 411 inserted into the damping hole 421, and thereby changing the effective liquid flow area of ​​the liquid flow gap 43.

[0053] In this technical solution, piston 2 is provided with a first fluid passage hole 21, which connects the first fluid chamber 11 and the second fluid chamber 12. When the shock-absorbing structure is in operation, both the first fluid chamber 11 and the second fluid chamber 12 are filled with hydraulic oil. When piston 2 slides within the cylindrical inner cavity, it compresses the first fluid chamber 11 or the second fluid chamber 12. The compressed hydraulic oil in the first fluid chamber 11 enters the second fluid chamber 12 through the first fluid passage hole 21. Conversely, at least part of the compressed hydraulic oil in the second fluid chamber 12 enters the first fluid chamber 11 through the first fluid passage hole 21.

[0054] In this technical solution, a second liquid hole 22 is further provided on the piston 2 , and the second liquid hole 22 is a hydraulic channel connecting the third liquid chamber 31 to the second liquid chamber 12 .

[0055] like Figure 3 or Figure 4 As shown, the piston 2 and piston rod 3 move upward, compressing the first liquid chamber 11 and expanding the second liquid chamber 12. The hydraulic pressure in the second liquid chamber 12 decreases, and the hydraulic oil in the first liquid chamber 11 enters the second liquid chamber 12 through the first liquid hole 21. Simultaneously, the hydraulic pressure in the second liquid chamber 12 is lower than that in the third liquid chamber 31, and the hydraulic oil in the third liquid chamber 31 enters the second liquid chamber 12 through the second liquid hole 22.

[0056] Therefore, when the piston 2 and piston rod 3 move downward, the hydraulic oil in the second liquid chamber 12 enters the third liquid chamber 31 through the liquid gap 43. When the piston 2 and piston rod 3 move upward, the hydraulic oil in the third liquid chamber 31 enters the second liquid chamber 12 through the second liquid hole 22. Therefore, a one-way valve 23 is provided on the second liquid hole 22. The one-way valve 23 opens the hydraulic passage from the second liquid hole 22 to the third liquid chamber 31 and the second liquid chamber 12.

[0057] In this solution, the one-way valve 23 includes a valve plate, a damping adjustment seat is screwed to the piston rod, and the damping adjustment seat clamps the valve plate at the end of the second liquid hole facing the second liquid chamber. The valve plate will only be opened by the hydraulic oil in the third liquid chamber 31 when the piston 2 and the piston rod 3 move upward.

[0058] In the above scheme, the liquid gap 43 is always in a conductive state, but the liquid gap 43 is very small, generally measured in millimeters, such as 1-8 mm. When the piston 2 and the piston rod 3 move upward, because the hydraulic oil in the first liquid chamber 11 and the third liquid chamber 31 will enter the second liquid chamber 12, at this time, when the piston 2 and the piston rod 3 move upward, the hydraulic oil in the third liquid chamber 31 enters the third liquid chamber 31 through the second liquid hole 22, and the amount of oil entering the second liquid chamber 12 through the liquid gap 43 is very small. At this time, the plug-in part 411 will not vibrate or make noise.

[0059] In the present technical solution, a first blocking member 5 is fixed to one end of the working fluid cylinder 1, and a second blocking member 6 is fixed to the other end. The first blocking member 5 is arranged toward the plug-in portion 411. The first blocking member 5 is made of rubber material and can also play a certain buffering role on the damping adjustment seat 42, thereby preventing the damping adjustment seat 42 from excessively contacting the first blocking member 5 as the piston rod 3 descends and causing collision damage. The piston 2 is fixed to one end of the piston rod 3, and the other end of the piston rod 3 is passed through the second blocking member 6. A rubber plug is provided on the first blocking member, which is used to abut and seal the damping hole. The end of the piston rod 3 passed through by the second blocking member 6 is used to connect to the main body bracket of the balancing vehicle, thereby buffering the main body bracket. The rubber plug is used to block the damping hole when the damping adjustment seat descends to contact the blocking head.

[0060] The utility model also provides a balancing vehicle, which includes the aforementioned low-noise shock-absorbing structure, so that the balancing vehicle has low noise, low failure rate, long service life and low use cost during use.

[0061] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A low-noise shock-absorbing structure, characterized in that: include: A working fluid cylinder having a cylindrical inner cavity; a piston, the piston being slidably disposed in the cylindrical inner cavity of the working fluid cylinder and dividing the cylindrical inner cavity into a first liquid cavity and a second liquid cavity; a piston rod connected to the piston and driving the piston to slide in the cylindrical inner cavity, wherein the piston rod has a third liquid cavity, the first liquid cavity and the second liquid cavity are in communication, or the first liquid cavity and the third liquid cavity are in communication; a damping adjustment portion disposed in the third liquid chamber and comprising a damping adjustment rod and a damping adjustment seat; a damping hole being provided on the damping adjustment seat; a plug-in portion being fixedly connected to one end of the damping adjustment rod, the plug-in portion being inserted into the damping hole; a liquid gap being defined between an outer circumferential surface of the plug-in portion and an inner circumferential surface of the damping hole, the liquid gap being a hydraulic passage connecting the second liquid chamber to the third liquid chamber; The cross section of the liquid-transmitting gap exhibits unevenness along a plane perpendicular to the axis of the damping hole.

2. The low-noise shock-absorbing structure according to claim 1, characterized in that: The damping adjustment rod can move relative to the damping adjustment seat along its own axial direction to change the insertion depth of the plug-in portion into the damping hole, thereby changing the effective liquid flow area of ​​the liquid flow gap.

3. The low-noise shock-absorbing structure according to claim 2, characterized in that: The damping hole is a cylindrical hole.

4. The low-noise shock-absorbing structure according to claim 3, characterized in that: The outer peripheral surface of the plug-in portion includes at least one inclined plane, and the cross section of the plug-in portion is asymmetric on at least one symmetry axis.

5. The low-noise shock-absorbing structure according to claim 4, characterized in that: The inclined plane is the flow-facing surface.

6. The low-noise shock-absorbing structure according to claim 1, characterized in that: The piston is provided with a first liquid hole, and the first liquid hole communicates with the first liquid cavity and the second liquid cavity.

7. The low-noise shock-absorbing structure according to claim 1 or 6, characterized in that: The piston is further provided with a second liquid hole, the second liquid hole communicating with the hydraulic passage from the third liquid chamber to the second liquid chamber; A one-way valve is provided on the second liquid passage hole, and the one-way valve conducts a hydraulic passage from the second liquid passage hole to the third liquid chamber and the second liquid chamber.

8. The low-noise shock-absorbing structure according to claim 7, characterized in that: The one-way valve includes a valve plate; the damping adjustment seat is screwed to the piston rod, and the damping adjustment seat clamps the valve plate at the end of the second liquid hole facing the second liquid chamber.

9. The low-noise shock-absorbing structure according to claim 1, characterized in that: A first sealing piece is fixed to one end of the working fluid cylinder, and a second sealing piece is fixed to the other end. The first sealing piece is arranged toward the plug-in portion, the piston is fixed to one end of the piston rod, and the other end of the piston rod passes through the second sealing piece; a rubber plug is provided on the first sealing piece, and the rubber plug is used to abut and seal the damping hole.

10. A balancing vehicle, characterized in that: The balancing vehicle includes the low-noise shock-absorbing structure according to any one of claims 1 to 9.

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