Compression valve assembly of mute shock absorber of railway vehicle

Abstract

The invention belongs to the technical field of shock absorber equipment, and discloses a compression valve assembly of a railway vehicle mute shock absorber, which comprises a working cylinder assembly and an oil storage cylinder assembly, a compression valve seat is arranged at the lower end of a working cylinder, the lower end of the compression valve seat is coaxially connected with a compression valve screw rod, the upper end of the compression valve seat is connected with a compensation valve limiter, and the upper end of the compensation valve limiter is connected with an oil storage cylinder assembly. A compensation valve plate is connected between the compression valve seat and the compensation valve limiter, the periphery of the compression valve screw is sleeved with a compression valve sleeve, the outside of the compression valve seat is connected with a compression valve spring seat, a compression valve spring is connected between the compression valve spring seat and the compression valve screw, and a compression valve throttling valve plate is arranged between the compression valve spring seat and the compression valve seat. A compensation valve plate is connected between the compression valve seat and the compensation valve limiter, a compensation valve circulation channel is formed in the compression valve seat, supporting pieces are fixedly connected beside the compensation valve circulation channel, and a compensation valve oil line is fixedly connected to the upper end of the compression valve seat; and the practicability is high.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorber equipment, in particular to a compression valve assembly of a silent shock absorber for a rail vehicle. Background Art

[0002] At present, in the field of shock absorbers, the noise of traditional hydraulic shock absorbers mainly comes from several aspects: 1. Noise generated by the friction between the piston rod and the oil seal; 2. Noise generated by the friction between the piston valve assembly and the side wall of the working cylinder; 3. Noise caused by the impact of the compression valve seat of the compression valve assembly compensation valve plate; 4. Noise of the circulating flow of oil inside the shock absorber. Among them, the slapping noise caused by the continuous impact of the compression valve seat by the compression valve assembly compensation valve plate during the opening and closing process is the most serious.

[0003] An adjustable shock absorber and vehicle are disclosed in patent application number CN202222974143.5. Through the setting of the adjuster assembly, the resistance can be adjusted only by controlling the position of the adjusting bolt. On the basis of not changing the major structure and size, the damping force can be adjusted according to the customer's own preferences by changing the flow area of ​​the shock absorber oil. The adjustment is convenient to meet the customer's own requirements of softness and hardness.

[0004] The Chinese patent application number CN202110856594.6 discloses a single-cycle hydraulic oil circuit anti-snaking shock absorber. In the present invention, the compression valve and the compensation valve are integrated together, and there is no need to set up a separate compensation valve. By reducing the diameter, the diameter of the damper can be reduced; when in use, the valve plate and the throttle plate can produce different deformations according to the impact force (pressure) received. When the impact force is small, the valve plate and the throttle plate are deformed smaller, and the oil can flow out quickly, allowing the piston rod to retract quickly. When the impact force is large, the valve plate and the throttle plate are deformed larger, and the oil can only flow out through the throttle groove, so that the piston rod has strong support and can be slowly retracted. When installed on the seat of the truck, the seat can be made more comfortable. However, the following problems still exist in practical applications, specifically: 1. During the process of oil compensation backflow to the working cylinder, it is necessary to continuously impact the compensation valve plate or the compression valve stopper at the compensation valve end of the compression valve assembly to allow the oil to flow back into the working cylinder. During this movement, the compensation valve plate and the compression valve stopper both move up and down in a floating manner. Because the elastic force of the compensation valve spring or spring stopper acts on the oil line surface of the compression valve seat when rebounding, it causes a large noise; 2. In the normal working cycle of the shock absorber and in the process of assembling the shock absorber, it is inevitable that air exists inside the working cylinder and the oil storage cylinder assembly. The air in the oil will enter the working cylinder during the working process of the shock absorber. The process of bubbles in the cylinder will affect the damping characteristics of the shock absorber and even cause air explosion problems; 3. During the reciprocating flow of oil in the working cylinder and the oil storage cylinder, the oil temperature will be unevenly distributed due to the different positions of the oil.

[0005] Therefore, the present invention provides a compression valve assembly of a rail vehicle silent shock absorber to solve the above-mentioned problem. Summary of the invention

[0006] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a compression valve assembly of a rail vehicle silent shock absorber, which effectively solves the problem of significantly reducing the force of the compensating valve plate hitting the compensation valve oil line during the rebound process, thereby reducing the rebound and hitting noise and achieving the purpose of noise reduction.

[0007] The present invention comprises a working cylinder assembly and an oil storage cylinder assembly, wherein a compression valve seat is arranged at the lower end of the working cylinder, a compression valve screw is coaxially connected to the lower end of the compression valve seat, a compensation valve limiter is connected to the upper end of the compression valve seat, a compensation valve plate is connected between the compression valve seat and the compensation valve limiter, an O-ring is connected between the compensation valve limiter and the compensation valve plate, a compression valve sleeve is arranged on the outer sleeve of the compression valve screw, a compression valve spring seat is connected to the outside of the compression valve seat, a compression valve spring is connected between the compression valve spring seat and the compression valve screw, a compression valve throttle plate is arranged between the compression valve spring seat and the compression valve seat, and a compensation valve plate is connected between the compression valve seat and the compensation valve limiter; A compensation valve flow channel is provided on the compression valve seat, and a support member is fixedly connected next to the compensation valve flow channel. The support member is used to support the compensation valve plate, and a compensation valve oil line is fixedly connected to the upper end of the compression valve seat.

[0008] Preferably, an interactive channel is provided on the compression valve seat, and the interior of the compression valve seat and the oil storage cylinder assembly are connected through the interactive channel. An oil pipe is fixedly connected to the interior of the interactive channel, and a plurality of injection channels are provided in the oil pipe. A primary one-way pressure valve is fixedly connected to one end of the injection channel close to the oil storage cylinder. A plurality of return channels are provided in the oil pipe, and the return channels and the injection channels are staggered. A secondary one-way pressure valve is fixedly connected to the side of the return channel close to the working cylinder. A stirring blade is rotatably connected inside the injection channel and the return channel, and the installation directions of the stirring blades in the injection channel and the return channel are opposite.

[0009] Preferably, the compression valve seat is made of powder metallurgy material; The lower end of the compensation valve limiter is provided with an inclined limit surface.

[0010] Preferably, the height of the support member is higher than the height of the compensation valve oil line, and the support member adopts an annular ring support structure.

[0011] Preferably, an elastic ring sheet is fixedly connected to the upper end surface of the compensation valve oil line, and the compensation valve sheet and the elastic ring sheet are in contact and connection.

[0012] The present invention improves the compression valve assembly of the existing oil pressure shock absorber and has the following beneficial effects: 1. By changing the design of the compensation valve end of the compression valve assembly, the original up-and-down floating compensation valve structure is changed to an edge warping type, which can significantly reduce the force of the compensation valve plate hitting the compensation valve oil line during the rebound process, thereby reducing the rebound slapping noise and achieving the purpose of noise reduction; 2. By adding multiple supporting cylinders on the surface of the compression valve seat, whose height is slightly lower than the compensation valve oil line surface, the compensation valve plate can be prevented from excessive concave bending and deformation during the shock absorber compression stroke, which can significantly increase the service life of the compensation valve plate, thereby improving the use and maintenance cycle of the entire shock absorber; 3. By setting up the oil pipe, injection channel, return channel, first-level one-way pressure valve, second-level one-way pressure valve, stirring blades and other structures, the stirring and diversion of the oil in the flow process is realized, making the temperature distribution more uniform. At the same time, the bubbles in the oil are divided, making the bubbles smaller, avoiding the problem of large bubbles in the working cylinder, which affects the damping effect and increases the working noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the main structure of the oil pressure shock absorber of the present invention.

[0014] Figure 2 It is a cross-sectional schematic diagram of the oil pressure shock absorber of the present invention.

[0015] Figure 3 For the present invention Figure 2 A partial enlarged schematic diagram in the middle.

[0016] Figure 4 It is a schematic diagram of the compression valve seat and its connecting parts of the present invention.

[0017] Figure 5 It is a cross-sectional schematic diagram of the compression valve assembly of the present invention.

[0018] Figure 6 It is a three-dimensional schematic diagram of the valve seat of the compression valve of the present invention.

[0019] Figure 7 It is a schematic cross-sectional view of the valve seat of the compression valve of the present invention.

[0020] Figure 8 It is a schematic diagram of the oil pipe and its connecting parts of the present invention.

[0021] Fig. 9 It is a cross-sectional schematic diagram of the oil pipe and its internal structure of the present invention.

[0022] Figure numerals: 1. working cylinder assembly; 2. oil storage cylinder assembly; 3. compression valve seat; 4. compression valve screw; 5. compensation valve limiter; 6. O-ring; 7. compensation valve plate; 8. compression valve sleeve; 9. compression valve spring seat; 10. compression valve throttle plate; 11. compensation valve flow channel; 12. support member; 13. compensation valve oil line; 14. interactive channel; 15. oil pipe; 16. injection channel; 17. primary one-way pressure valve; 18. return liquid channel; 19. secondary one-way pressure valve; 20. stirring blade; 21. inclination limit surface; 22. compression valve flow channel. DETAILED DESCRIPTION

[0023] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figures 1 to 9 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0024] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0025] The present invention includes a working cylinder assembly 1 and an oil storage cylinder assembly 2, wherein a compression valve seat 3 is disposed at the lower end of the working cylinder, wherein the compression valve seat 3 provides a support basis for subsequent structures and ensures that the reciprocating flow of oil in the working cylinder assembly 1 and the oil storage cylinder assembly 2 can be realized through the compression valve seat 3, wherein the lower end of the compression valve seat 3 is coaxially connected with a compression valve screw 4, wherein the upper end of the compression valve seat 3 is connected with a compensation valve limiter 5, wherein the compression valve stem and the compensation valve limiter 5 are fixedly connected, wherein a compensation valve plate 7 is connected between the compression valve seat 3 and the compensation valve limiter 5, wherein an O-ring 6 is connected between the compensation valve limiter 5 and the compensation valve plate 7, wherein the O-ring 6 is used to realize the The seal between the compensation valve limiter 5 and the compensation valve plate 7 avoids leakage. The outer sleeve of the compression valve screw 4 is provided with a compression valve sleeve 8. The outside of the compression valve sleeve 8 is connected with a compression valve spring seat 9. A compression valve spring is connected between the compression valve spring seat 9 and the compression valve screw 4. Under the action of the compression valve spring, the compression valve spring seat 9 slides up and down along the compression valve sleeve 8. A compression valve throttle valve plate 10 is arranged between the compression valve spring seat 9 and the compression valve seat 3. The compression valve throttle valve plate 10 is sealed by the fit between the compression valve throttle valve plate 10 and the compression valve spring seat 9. At the same time, when the oil pressure shock absorber is compressed, the oil The compression valve throttle plate 10 is entered through the compression valve seat 3, and the oil in the compression valve throttle plate 10 squeezes the compression valve spring seat 9, enters to realize the downward sliding of the compression valve spring seat 9, and then realizes the opening of the compression valve throttle plate 10, and then the oil enters the oil storage cylinder assembly 2 through the compression valve seat 3 and the compression valve throttle plate 10. A compensation valve plate 7 is connected between the compression valve seat 3 and the compensation valve limiter 5. A compensation valve flow channel 11 is opened on the compression valve seat 3. The opening and closing of the pressure relief hole on the compression valve seat 3 is controlled by the compensation valve plate 7. When the oil pressure shock absorber is compressed, the compensation valve plate 7 is The compensation valve flow channel 11 is sealed under the action of oil pressure. At the same time, when the oil pressure shock absorber is stretched, the oil in the oil storage cylinder assembly 2 flows upward, forcing the outer edge of the compensation valve plate 7 to bend and deform. The oil flowing into the compensation valve flow channel 11 can pass through the gap between the compensation valve plate 7 and the compensation valve oil line 13, and then the oil passes through the compression valve assembly into the oil storage cylinder assembly 2. The compensation valve flow channel 11 is fixedly connected with a support member 12, and the compensation valve plate 7 is supported by the support member 12. The upper end of the compression valve seat 3 is fixedly connected with a compensation valve oil line 13. During the stretching process, the edge of the compensation valve plate 7 is slightly warped, and the pressure relief and oil replenishment process will immediately occur.The actual edge warping height is very small. At the same time, because the width of the compensation valve oil line 13 on the compression valve seat 3 is narrow, that is, the contact area is small, the energy impact of hitting the oil line when opening and closing the compensation valve plate 7 is small, and the noise caused can be significantly reduced.

[0026] In the specific implementation of this embodiment, when the oil pressure shock absorber is in the extension stroke, the compensation valve plate 7 is in the open state, and the oil flows into the compression valve assembly. At this time, the pressure of part of the oil forces the outer edge of the compensation valve plate 7 to bend and deform, and the oil flowing into the compensation valve flow channel 11 can pass through the gap between the compensation valve plate 7 and the compensation valve oil line 13, and flow into the lower cavity of the working cylinder assembly 1 through the compensation valve assembly, thereby achieving the purpose of compensating the oil; When the oil pressure shock absorber is in the compression stroke, the compensation valve plate 7 is in a closed state and does not move. The oil in the lower cavity of the working cylinder assembly 1 flows into the compression valve assembly through the compression valve flow channel 22. Under the low-speed compression condition, this part of the oil flows into the compression valve assembly through the compression valve throttle plate 10 and flows back into the oil storage cylinder assembly 2 through the compression valve seat 3. At this time, the low-speed damping force is generated; Under high-speed compression conditions, the oil in the lower cavity of the working cylinder assembly 1 passes through the compression valve flow channel 22, and the pressure forces the compression valve spring to deform and compress. At the same time, the compression valve throttle plate 10 and the compression valve spring seat 9 slide downward on the outside of the compression valve sleeve 8 and flow back into the oil storage cylinder assembly 2 through the compression valve seat 3, so that a high-speed damping force is generated; At the same time, during the compression process, due to the internal pressure of the lower part of the working cylinder assembly 1, a large pressure will be generated on the surface of the compensation valve plate 7. The multiple support columns on the surface of the compression valve seat 3 can provide better support for the compensation valve plate 7 to prevent the compensation valve plate 7 from excessive deformation, which can significantly improve the service life of the compensation valve plate 7, thereby improving the service life of the entire oil pressure shock absorber.

[0027] Since the oil temperature at different positions is different during the working process of the hydraulic shock absorber, it is inevitable that there will be gas problems in the oil, which will affect the service life of the equipment. At the same time, the presence of bubbles will affect the damping effect. Therefore, the present embodiment provides a structure for stirring and mixing the oil and dividing the gas to avoid the appearance of large bubbles. Specifically, an interactive channel 14 is provided on the compression valve seat 3, and the interactive channel 14 is used to connect the interior of the compression valve seat 3 and the oil storage cylinder. An oil pipe 15 is fixedly connected to the interior of the interactive channel 14, and a plurality of injection channels 16 are provided in the oil pipe 15. A first-level one-way pressure valve 17 is fixedly connected to the interior of the injection channel 16 near one end of the oil storage cylinder assembly 2, so that the oil can only enter the interior of the working cylinder assembly 1 from one end of the oil storage cylinder assembly 2, thereby realizing a one-way flow of the oil.

[0028] A plurality of return channels 18 are provided in the oil pipe 15. The return channels 18 and the injection channels 16 are staggered. The return channels 18 are fixedly connected to a secondary one-way pressure valve 19 on one side close to the working cylinder assembly 1, so that the oil can only enter the oil storage cylinder assembly 2 from one end of the working cylinder assembly 1, thereby realizing a one-way flow of the oil. The injection channels 16 and the return channels 18 are rotatably connected with stirring blades 20. The installation directions of the stirring blades 20 in the injection channels 16 and the return channels 18 are opposite. When the oil flows in the injection channels 16 and the return channels 18, the oil will drive the stirring blades 20 to rotate under the action of the oil pressure, thereby realizing the stirring of the oil and making the oil temperature evenly distributed. At the same time, it also realizes the pre-crushing of the bubbles in the oil, so that the bubbles are divided into smaller states, thereby avoiding the appearance of large bubbles in the working cylinder assembly 1 and affecting the damping effect of the oil shock absorber.

[0029] The compression valve seat 3 is made of powder metallurgy material, which is also called porous sintered material. It is made of spherical or irregular shaped metal or alloy powder through molding and sintering. The internal channels of the material are crisscrossed and interconnected. It generally has a volume porosity of 30% to 60% and a pore size of 1 to 100 microns. Therefore, the oil molecules can fully penetrate into the interior. During the rebound process of the compensation valve plate 7, the rebound impact force can be reduced, thereby achieving the purpose of noise reduction.

[0030] The lower end of the compensation valve limiter 5 is provided with an inclined limiting surface 21, which facilitates the oil in the working cylinder assembly 1 to pass through the compensation valve limiter 5 and enter the interior of the compensation valve limiter 5, and then act on the compensation valve plate 7. At the same time, during the stretching process of the oil pressure shock absorber, the edge of the compensation valve plate 7 is warped and deformed, and the inclined limiting surface 21 also provides deformation space for the deformation of the compensation valve plate 7, thereby ensuring the smooth passage of the oil.

[0031] The height of the support member 12 is higher than the height of the compensation valve oil line 13. The support member 12 adopts an annular ring support structure, which can prevent the compensation valve plate 7 from excessive concave bending and deformation during the compression stroke of the pressure shock absorber, and can significantly increase the service life of the compensation valve plate 7, thereby increasing the use and maintenance cycle of the entire oil pressure shock absorber.

[0032] In order to further reduce the slapping noise during the contact process between the compensation valve plate 7 and the compensation valve oil line 13, an elastic ring plate is fixedly connected to the upper end surface of the compensation valve oil line 13, and the compensation valve plate 7 and the elastic ring plate are in contact and connected. The elastic ring plate buffers the slapping of the compensation valve plate 7 and the compensation valve oil line 13. At the same time, during the contact process between the compensation valve plate 7 and the compensation valve oil line 13, the sealing between the compensation valve plate 7 and the compensation valve oil line 13 is enhanced.

[0033] When the present invention is used in practice, during the stretching process of the oil shock absorber, the oil in the oil storage cylinder assembly 2 flows into the compression valve assembly through the interactive channel 14 between the compression valve assembly and the oil storage cylinder assembly 2. The pressure of this part of the oil forces the outer edge of the compensation valve plate 7 to bend and deform. The oil flowing into the compensation valve flow channel 11 can pass through the gap between the compensation valve plate 7 and the compensation valve oil line 13, and flow into the compensation valve plate 7 in the lower chamber of the working cylinder assembly 1 through the interactive channel 14 between the compensation valve and the working cylinder on the compensation valve stopper 5, thereby achieving the purpose of compensating the oil. During the stretching process, the edge of the compensation valve plate 7 is slightly warped, and the pressure relief and oil replenishment process will occur immediately. The actual edge warping height is very small. At the same time, because the width of the compensation valve oil line 13 on the compression valve seat 3 is narrow (that is, the contact area is small), the energy impact of hitting the oil line when opening and closing the compensation valve plate 7 is small, and the noise caused can be significantly reduced; During the compression process of the oil-pressure shock absorber, the oil in the lower cavity of the working cylinder assembly 1 flows into the compression valve assembly through the compression valve flow channel 22. Under low-speed compression conditions, this part of the oil flows into the compression valve assembly through the compression valve throttle plate 10, and flows back into the oil storage cylinder assembly through the interaction channel 14 between the compression valve seat 3 and the oil storage cylinder assembly 2. At this time, a low-speed damping force is generated; Under high-speed compression conditions, the oil in the lower cavity of the working cylinder assembly 1 passes through the compression valve flow channel 22, and the pressure forces the compression valve spring to deform and compress. The compression valve throttle valve plate 10, the compensation valve plate 7, and the compression valve spring seat 9 slide downward on the outside of the compression valve valve sleeve 8, and flow back into the oil storage cylinder assembly 2 through the interactive channel 14 between the compression valve assembly and the oil storage cylinder assembly 2, then a high-speed damping force is generated.

[0034] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A compression valve assembly for a rail vehicle silent shock absorber, comprising a working cylinder assembly (1) and an oil storage cylinder assembly (2), characterized in that: The lower end of the working cylinder assembly (1) is provided with a compression valve seat (3), the lower end of the compression valve seat (3) is coaxially connected to a compression valve screw (4), the upper end of the compression valve seat (3) is connected to a compensation valve limiter (5), a compensation valve plate (7) is connected between the compression valve seat (3) and the compensation valve limiter (5), an O-ring (6) is connected between the compensation valve limiter (5) and the compensation valve plate (7), a compression valve sleeve (8) is provided on the outer sleeve of the compression valve screw (4), a compression valve spring seat (9) is connected to the outside of the compression valve seat (3), a compression valve spring is connected between the compression valve spring seat (9) and the compression valve screw (4), and a compression valve throttle plate (10) is provided between the compression valve spring seat (9) and the compression valve seat (3); The compression valve seat (3) is provided with a compensation valve flow channel (11), and a support member (12) is fixedly connected next to the compensation valve flow channel (11). The compensation valve plate (7) is supported by the support member (12), and the upper end of the compression valve seat (3) is fixedly connected with a compensation valve oil line (13).

2. The compression valve assembly of a rail vehicle silent shock absorber according to claim 1, characterized in that: The compression valve seat (3) is provided with an interactive channel (14), and the interior of the compression valve seat (3) and the oil storage cylinder assembly (2) are connected via the interactive channel (14). An oil pipe (15) is fixedly connected to the interior of the interactive channel (14), and a plurality of injection channels (16) are provided in the oil pipe (15). The interior of the injection channel (16) close to one end of the oil storage cylinder assembly (2) is fixedly connected with a primary one-way pressure valve (17); A plurality of return channels (18) are provided in the oil pipe (15). The return channels (18) and the injection channels (16) are arranged in an alternating manner. A secondary one-way pressure valve (19) is fixedly connected to the return channels (18) on one side close to the working cylinder assembly (1). A stirring blade (20) is rotatably connected inside the injection channels (16) and the return channels (18). The stirring blades (20) in the injection channels (16) and the return channels (18) are installed in opposite directions.

3. The compression valve assembly of a rail vehicle silent shock absorber according to claim 2, characterized in that: The compression valve seat (3) is made of powder metallurgy material; The compensating valve limiter (5) is provided with an inclined limit surface (21) at the lower end.

4. The compression valve assembly of a rail vehicle silent shock absorber according to claim 1, characterized in that: The height of the support member (12) is higher than the height of the compensation valve oil line (13), and the support member (12) adopts an annular ring support structure.

5. The compression valve assembly of a rail vehicle silent shock absorber according to claim 1, characterized in that: An elastic ring sheet is fixedly connected to the upper end surface of the compensation valve oil line (13), and the compensation valve sheet (7) is in contact with and connected to the elastic ring sheet.

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