Front shock absorber for tricycle and two-wheeled vehicle

Abstract

The front shock absorber for the tricycle and the two-wheeled vehicle comprises a bottom cylinder, a fork pipe and a piston pipe, the lower end of the fork pipe is arranged in the bottom cylinder in a sealing and sliding fit mode, and a lower cavity is formed in the space between the bottom of the fork pipe and the bottom cylinder; the piston pipe is of a hollow tubular structure, the lower end of the piston pipe is connected to the bottom of the bottom cylinder, the upper end of the piston pipe extends into the fork pipe and is in sealing sliding fit with the fork pipe, and the piston divides the space of the fork pipe into an upper oil storage cavity and a lower cavity. The upper end of the piston pipe is in sealing sliding fit with the fork pipe through a piston assembly; the piston assembly comprises a valve plate which is unidirectionally communicated with the oil storage cavity; by arranging the valve plate, the valve plate is opened under the action of pressure, oil in the upper cavity can flow into the oil storage cavity through the valve plate, so that the damping value of the fork pipe in the return state is reduced, the damping value of the upper cavity is always kept within a certain range, and it is guaranteed that no matter a vehicle runs on a small bumpy road surface or a large bumpy road surface, the service life of the vehicle is prolonged. And good comfort is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of shock absorbers, in particular to a front shock absorber for a tricycle and a two-wheeled vehicle. Background Art

[0002] The main function of the shock absorber is to provide cushioning. Without it, even a small bump on the road will cause a great impact on the user, which will not only make the driver feel uncomfortable, but also cause operational errors and endanger personal safety.

[0003] Existing front shock absorber such as Figure 1 As shown, it includes a bottom cylinder 1', a fork tube 6' and a piston tube 3'. The lower end of the fork tube 6' is inserted into the bottom cylinder 1' and is in sealing and sliding cooperation with the bottom cylinder 1'. The space between the bottom of the fork tube 6' and the bottom cylinder 1' forms a lower cavity 2'; the piston tube 3' is a hollow tubular structure, the lower end of which is connected to the bottom of the bottom cylinder 1', and the upper end extends into the fork tube 6' and is in sealing and sliding cooperation with the fork tube 6' through a piston. The piston divides the space of the fork tube 6' into an oil storage cavity 5' located at the upper part and an upper cavity 4' located at the lower part; a one-way valve connected to the upper cavity 4' is installed at the bottom of the fork tube 6', a plurality of oil holes 7' are opened on the piston tube 3' and correspond to the lower cavity 2', and a plurality of oil holes 7' are opened on the piston tube 3' and correspond to the lower cavity 2'. A throttling hole 8' is provided in the upper cavity 4'; when the fork tube 6' moves downward, a part of the oil in the lower cavity 2' flows to the upper cavity 4' through the one-way valve, and the other part flows into the upper cavity 4' and the oil storage cavity 5' through the piston tube 3'; when the fork tube 6' moves to the bottom of the bottom cylinder' and rebounds upward, the oil in the upper cavity 4' flows into the lower cavity 2' and the oil storage cavity 5' respectively through the throttling hole 8' and the piston tube 3', and then the oil storage cavity 5' replenishes oil to the lower cavity 2' through the piston tube 3'. The volume of the upper and lower cavities 2' is changed by the movement of the fork tube 6', and the oil flows between the upper and lower cavities and the oil storage cavity 5' through the piston tube 3', so that the shock absorber produces a damping effect, thereby achieving a shock absorbing effect.

[0004] For shock absorbers with this structure, since the size of the throttle hole is fixed, the amount of oil flowing out of the upper cavity under high pressure is constant per unit time. This makes the recovery damping value of the shock absorber with this structure show a linear change trend. The faster the fork tube moves up and down, the greater the damping value. When the vehicle is traveling on a more bumpy road, the speed at which the fork tube moves up and down increases, and the larger damping value makes the shock absorbing effect of the shock absorber ineffective, affecting driving comfort. Utility Model Content

[0005] In view of the defects in the prior art, the purpose of the utility model is to provide a front shock absorber for tricycles and two-wheeled vehicles with good shock absorption effect.

[0006] The technical solution adopted by the utility model is:

[0007] A front shock absorber for three-wheeled vehicles and two-wheeled vehicles comprises a bottom tube, a fork tube and a piston tube, wherein the lower end of the fork tube is sealingly and slidingly fitted in the bottom tube, and the space between the bottom of the fork tube and the bottom tube forms a lower cavity; the piston tube is a hollow tubular structure, the lower end of which is connected to the bottom of the bottom tube, and the upper end extends into the fork tube and sealingly and slidingly fits with the fork tube, and the piston divides the space of the fork tube into an oil storage chamber located at the upper part and an upper cavity located at the lower part; the upper end of the piston tube is sealingly and slidingly fitted with the fork tube through a piston assembly, and the piston assembly comprises a valve sheet that is unidirectionally conductive to the oil storage chamber.

[0008] Furthermore, a one-way valve for unidirectionally conducting to the upper cavity is installed at the bottom of the fork tube; a plurality of oil holes are opened on the piston tube corresponding to the lower cavity, and a throttling hole is opened on the piston tube corresponding to the upper cavity.

[0009] Furthermore, the piston assembly also includes a valve seat, which is sleeved on the upper end of the piston tube, and a valve hole is opened on the valve seat for connecting the upper cavity and the oil storage cavity. The valve plate is installed at one end of the oil storage cavity and covers the valve hole, and can be opened under the pressure of the upper cavity.

[0010] Furthermore, the piston assembly also includes a locking nut, the valve plate is sleeved on the upper end of the piston rod, and the locking nut is threadedly connected to the upper end of the piston rod and pressed on the inner side of the valve plate.

[0011] Furthermore, the piston assembly also includes a spacer, which is sleeved on the upper end of the piston rod and located between the valve plate and the locking nut.

[0012] Furthermore, the piston assembly also includes a piston sealing ring, which is sleeved on the outer periphery of the valve seat and is sealingly and slidingly matched with the inner wall of the fork tube.

[0013] Furthermore, the valve sheets are 1 to 6 pieces arranged in an overlapping manner.

[0014] Furthermore, it also includes a buffer spring, which is sleeved on the piston tube and located in the upper cavity.

[0015] Furthermore, it also includes an inner spring or an outer spring, wherein the inner spring is installed in the oil storage chamber, and the outer spring is sleeved outside the fork tube.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0018] Figure 1 It is a schematic diagram of the structure of a front shock absorber for a tricycle and a two-wheeled vehicle in the prior art;

[0019] Figure 2 A schematic diagram of the structure of a front shock absorber for a tricycle and a two-wheeled vehicle provided in an embodiment of the present application;

[0020] Figure 3 for Figure 2 A magnified view of part A;

[0021] Figure 4 A schematic diagram of the structure of the valve seat provided in the embodiment of the present application;

[0022] Figure 5 The theoretical damping force of the front shock absorber for tricycles and two-wheeled vehicles provided in the embodiments of the present application;

[0023] Figure 6 The measured damping force of the front shock absorber for three-wheeled vehicles and two-wheeled vehicles provided in the embodiments of the present application.

[0024] in, Figure 1 In the embodiment, there are a bottom cylinder 1', a lower cavity 2', a piston tube 3', an upper cavity 4', an oil storage cavity 5', a fork tube 6', an oil hole 7', and a throttle hole 8'.

[0025] Figure 2 to Figure 5 In it, bottom cylinder 1, lower cavity 11, fork tube 2, upper cavity 21, oil storage cavity 22, outer spring 3, inner spring 4, piston tube 5, oil hole 51, throttle hole 52, piston assembly 6, valve seat 61, piston sealing ring 62, valve plate 63, spacer gasket 64, locking nut 65, valve hole 66, one-way valve 7, buffer spring 8. DETAILED DESCRIPTION

[0026] Here, it should be noted that the functions and methods involved in the present invention are merely conventional adaptive applications of the prior art. Therefore, the improvement of the present invention on the prior art is essentially the connection relationship between the hardware, rather than the functions and methods themselves. That is, although the present invention involves some functions and methods, it does not include improvements to the functions and methods themselves. The description of the functions and methods in the present invention is to better illustrate the present invention so as to better understand the present invention.

[0027] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0028] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0029] See also Figure 2 to Figure 6 The present application discloses a front shock absorber for three-wheeled vehicles and two-wheeled vehicles, comprising a base tube 1, a fork tube 2 and a piston tube 5. The lower end of the fork tube 2 is sealingly and slidably fitted in the base tube 1, and the space between the bottom of the fork tube 2 and the base tube 1 forms a lower cavity 11; the piston tube 5 is a hollow tubular structure, the lower end of which is connected to the bottom of the base tube 1, and the upper end extends into the fork tube 2 and is sealingly and slidably fitted with the fork tube 2. The piston divides the space of the fork tube 2 into an oil storage chamber 22 located at the upper part and an upper cavity 21 located at the lower part; the upper end of the piston tube 5 is sealingly and slidably fitted with the fork tube 2 through a piston assembly 6, and the piston assembly 6 includes a valve plate 63 that is unidirectionally conductive to the oil storage chamber 22.

[0030] The present application sets a piston assembly 6, and the upper end of the piston tube 5 is sealed and slidably matched with the fork tube 2 through the piston assembly 6. The piston assembly 6 includes a valve plate 63 that is unidirectionally connected to the oil storage chamber 22; when the fork tube 2 moves upward and the pressure in the upper cavity 21 increases to a certain level, the valve plate 63 opens under the action of pressure, and the oil in the upper cavity 21 can also flow into the oil storage chamber 22 through the valve plate 63 on the basis of the conventional oil leakage path, thereby reducing the damping value of the fork tube 2 in the recovery state; and when the pressure in the upper cavity 21 is not enough to open the valve plate 63, the oil in the upper cavity 21 still flows out through the conventional oil leakage path, so that the damping value of the upper cavity 21 is always maintained within a certain range, ensuring that the vehicle has good comfort whether it is driving on a slightly bumpy road or a heavily bumpy road.

[0031] The front shock absorber of the present application is applicable to two-wheeled vehicles and three-wheeled vehicles. When used for a two-wheeled vehicle, it also includes an inner spring 4 installed in the oil storage chamber 22; when used for a three-wheeled vehicle, it also includes an outer spring 3, which is sleeved on the outside of the fork tube 2.

[0032] A one-way valve 7 that conducts one way toward the upward cavity 21 is installed at the bottom of the fork tube 2; an oil hole 51 is opened on the piston tube 5 and corresponds to the lower cavity 11, and a throttling hole 52 is opened on the piston tube 5 and corresponds to the upper cavity 21.

[0033] When in use, the fork tube 2 is installed upward at the front fork position of the two-wheeled vehicle or three-wheeled vehicle. When the vehicle is driving, the fork tube 2 moves up and down in the bottom tube 1 due to the bumps on the road; when the fork tube 2 moves downward, the volume of the lower cavity 11 decreases, and the volume of the upper cavity 21 increases. Under the action of pressure, the oil in the lower cavity 11 flows into the upper cavity 21 through the one-way valve 7 and flows into the upper cavity 21 through the oil hole 51, the piston tube 5 and the throttle hole 52; when the fork tube 2 moves upward, the volume of the upper cavity 21 decreases, and the volume of the lower cavity 11 increases. Under the action of pressure, the oil in the upper cavity 21 flows into the lower cavity 11 through the throttle hole 52, the piston tube 5 and the oil hole 51, and flows directly into the oil storage chamber 22 through the opened valve plate 63, thereby relieving the pressure of the upper cavity 21, reducing the damping value of the upper cavity 21, realizing the adjustability of the damping value in the recovery state of the front shock absorber, and improving driving comfort; when the fork tube 2 moves up and down, excess oil will flow into the oil storage chamber 22, and then be compensated to the corresponding upper cavity 21 or lower cavity 11 by the oil storage chamber 22.

[0034] The piston assembly 6 of the present application replaces the piston in the prior art, and the piston assembly 6 has both a sealing and sliding function and a unidirectional conduction function.

[0035] Specifically, the piston assembly 6 also includes a valve seat 61, a spacer 64 and a locking nut 65. The valve seat 61 is sleeved on the upper end of the piston tube 5. A valve hole 66 for connecting the upper cavity 21 with the oil storage cavity 22 is opened on the valve seat 61. The valve hole 66 can be arranged at intervals along the circumference of the valve seat 61. A groove is provided along the circumference of the valve seat 61 and at one end of the oil storage cavity 22. The valve hole 66 is correspondingly opened in the groove; the valve plate 63 is sleeved on the piston rod. The upper end is located at one end of the oil storage chamber 22 and covers the groove, thereby covering the valve hole 66; the spacer 64 is sleeved on the upper end of the piston rod, and the locking nut 65 is threadedly connected to the upper end of the piston rod, pressing the spacer 64 against the inner side of the valve plate 63; when the pressure of the upper cavity 21 increases to a certain level, the valve plate 63 opens under the action of pressure, connecting the upper cavity 21 and the oil storage chamber 22, so that the oil in the upper cavity 21 flows out of the oil storage chamber 22.

[0036] The valve sheets 63 can be overlapped by 1 to 6 sheets as needed. The multiple valve sheets 63 can be completely overlapped or partially overlapped. When partially overlapped, the upper valve sheet 63 overlaps the inner side of the lower valve sheet 63. By overlapping the multiple valve sheets 63, the overall strength of the valve sheet 63 is increased, or the strength of the inner part of the valve sheet 63 is increased, thereby adjusting the opening degree of the valve sheet 63 under the same pressure.

[0037] In order to achieve a sealed sliding fit with the fork tube 2 , the piston assembly 6 also includes a piston sealing ring 62 , which is sleeved on the outer periphery of the valve seat 61 and is sealed and slidably fitted with the inner wall of the fork tube 2 .

[0038] In order to provide a certain buffer when the fork tube 2 moves, a buffer spring 8 is also included. The buffer spring 8 is sleeved on the piston tube 5 and located in the upper cavity 21. One end of the buffer spring 8 can be fixed to the bottom of the valve seat 61 of the piston assembly 6.

[0039] In this application, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0040] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, systems and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, systems, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, systems, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A front shock absorber for tricycles and two-wheeled vehicles, comprising a bottom tube, a fork tube and a piston tube, wherein the lower end of the fork tube is sealed and slidably fitted in the bottom tube, and the space between the bottom of the fork tube and the bottom tube forms a lower cavity; the piston tube is a hollow tubular structure, the lower end of which is connected to the bottom of the bottom tube, and the upper end extends into the fork tube and is sealed and slidably fitted with the fork tube, and the piston divides the space of the fork tube into an oil storage cavity located at the upper part and an upper cavity located at the lower part; characterized in that The upper end of the piston tube is sealingly slidably matched with the fork tube through a piston assembly, and the piston assembly includes a valve plate that is unidirectionally conductive to the oil storage chamber.

2. The front shock absorber for three-wheeled vehicles and two-wheeled vehicles according to claim 1, characterized in that: A one-way valve for unidirectionally conducting to the upper cavity is installed at the bottom of the fork tube; a plurality of oil holes are opened on the piston tube corresponding to the lower cavity, and a throttling hole is opened on the piston tube corresponding to the upper cavity.

3. The front shock absorber for three-wheeled vehicles and two-wheeled vehicles according to any one of claims 1 or 2, characterized in that: The piston assembly also includes a valve seat, which is sleeved on the upper end of the piston tube. A valve hole is provided on the valve seat for connecting the upper cavity and the oil storage cavity. The valve plate is installed at one end of the oil storage cavity and covers the valve hole, and can be opened under the pressure of the upper cavity.

4. The front shock absorber for three-wheeled vehicles and two-wheeled vehicles according to claim 3, characterized in that: The piston assembly also includes a locking nut. The valve plate is sleeved on the upper end of the piston rod. The locking nut is threadedly connected to the upper end of the piston rod and pressed against the inner side of the valve plate.

5. The front shock absorber for three-wheeled vehicles and two-wheeled vehicles according to claim 4, characterized in that: The piston assembly also includes a spacer, which is sleeved on the upper end of the piston rod and located between the valve plate and the locking nut.

6. The front shock absorber for three-wheeled vehicles and two-wheeled vehicles according to claim 3, characterized in that: The piston assembly also includes a piston sealing ring, which is sleeved on the outer periphery of the valve seat and is in sealing and sliding cooperation with the inner wall of the fork tube.

7. The front shock absorber for three-wheeled vehicles and two-wheeled vehicles according to claim 3, characterized in that: The number of the valve sheets is 1 to 6 and they are overlapped.

8. The front shock absorber for three-wheeled vehicles and two-wheeled vehicles according to claim 1, characterized in that: It also includes a buffer spring, which is sleeved on the piston tube and located in the upper cavity.

9. The front shock absorber for three-wheeled vehicles and two-wheeled vehicles according to claim 1, characterized in that: It also includes an inner spring or an outer spring, wherein the inner spring is installed in the oil storage chamber, and the outer spring is sleeved outside the fork tube.

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