Piston valve system for improving NVH (Noise Vibration and Harshness) performance of automobile shock absorber

Abstract

The utility model relates to the technical field of automobile shock absorbers, and provides a piston valve system for improving NVH (Noise Vibration and Harshness) performance of an automobile shock absorber, which is characterized in that a compression surface outer valve line and a compression surface inner valve line are sequentially arranged around a compression surface circulation hole of a rubber-coated piston compression surface from outside to inside to form an independent valve line surface; the volume of a cavity for storing shock absorber oil before the piston is compressed and opened is smaller than that of a piston recovery surface, so that a higher pressure buildup speed is achieved at the same speed, pressure buildup can be faster before a compression valve plate is opened, and the NVH performance of a shock absorber piston rod during reversing is improved; a rebound surface outer valve line and a rebound surface inner valve line are sequentially arranged on the three side edges, except for the position close to the center of the rubber-coated piston, of a rebound surface circulation hole of the rebound surface of the rubber-coated piston from outside to inside to form a continuous valve line surface, and the inner valve line and the outer valve line are arranged on the two circumferences respectively, so that the valve block set can be opened more smoothly.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive shock absorbers, in particular to a piston valve system for improving the NVH performance of automotive shock absorbers. Background Technique

[0002] Automotive shock absorbers are essentially vibration dampers, which are mainly used to quickly suppress the vibration of springs and ensure that the wheels are always in contact with the ground, thus ensuring the controllability of the vehicle. Most automotive shock absorbers are hydraulic shock absorbers. Its working principle is that when the frame (or body) and the axle (or wheel) approach each other, the oil in the shock absorber cavity repeatedly passes from one cavity through different throttle holes into another cavity. The friction between the throttle hole wall and the shock absorber oil and the internal friction between the oil molecules form a damping force on the movement of the piston rod, converting the energy of the vehicle vibration into heat energy, and then the shock absorber oil dissipates the heat to the outside air. Among them, the design of the piston valve system is the core technology of the shock absorber, and its performance will directly affect the damping force indication characteristics of the shock absorber. A common rebound valve system structure can meet the above basic functions.

[0003] With the increasingly fierce competition in the automotive industry, end customers have higher and higher requirements for the comfort of shock absorbers. Especially for new energy vehicles, the noise generated during the operation of the motor is small, and it may not be able to cover the noise generated during the movement of the piston valve system of the shock absorber. Therefore, it is necessary for shock absorber manufacturers to study piston valve systems that can improve NVH performance.

[0004] In the prior art, a piston valve system is proposed in the patent document CN2026206467U. The piston valve system is composed of a first support washer, a first valve plate group, a piston, a second valve plate group, and a second support washer sequentially assembled on the piston rod. The two sides of the piston are respectively composed of an outer valve line, a convex edge, an inner valve line, a convex platform, and a flow hole. The problems are as follows: (1) Here, the piston rebound surface that contacts the first valve plate group is taken as an example. The height of the piston convex platform is lower than the height of the inner valve line, and the height of the inner valve line is lower than the height of the outer valve line. After the nut is tightened, due to the arrangement of the aforementioned valve line surfaces with increasing height from the inside to the outside, the first valve plate group will be in a concave state. When the piston valve system enters the rebound stretching stroke, the shock absorber oil passing through the piston flow hole will open the first valve plate group that is in close contact. When the opening degree is small, the oil passes through the gap between the valve plate group and the outer valve line surface at a high speed, which is likely to generate a whistling noise.

[0005] (2) The valve line surface arrangement forms of the piston compression surface and the restoration surface are the same, both adopting a three-slot continuous closed valve line arrangement in the shape of a clover. Since the main function of the piston compression surface is to quickly open during the compression stroke of the shock absorber, so that the oil in the lower chamber of the piston can quickly enter the upper chamber of the piston, to avoid the influence of the empty stroke when the shock absorber piston reverses on the vehicle NVH, this requires that the valve line surface design of the compression surface needs to achieve faster pressure build-up; while the main function of the restoration surface is to generate the restoration damping force through the throttle valve plate and the piston groove throttle during the stretching process of the shock absorber, and its pressure build-up speed more depends on the throttle valve plate. To sum up, the compression surface should be arranged in a form with faster pressure build-up ability. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a piston valve system for improving the NVH performance of an automotive shock absorber, which solves the problems existing in the background technology.

[0007] Based on the above purpose, the present invention provides a piston valve system for improving the NVH performance of an automotive shock absorber, including a piston rod end, a compression support sheet, a compression high-speed valve sheet, a compression valve sheet group, a rubber-coated piston, a restoration flow valve sheet, a restoration throttle valve sheet, a restoration valve sheet group, a restoration high-speed valve sheet, a restoration support sheet, a restoration gasket, and a nut. The piston rod end is sequentially assembled with a compression support sheet, a compression high-speed valve sheet, a compression valve sheet group, a rubber-coated piston, a restoration flow valve sheet, a restoration throttle valve sheet, a restoration valve sheet group, a restoration high-speed valve sheet, a restoration support sheet, and a restoration gasket from left to right, and the overall valve system is locked by a nut; there are 4 uniformly distributed compression surface flow holes on the circumference of the compression surface of the rubber-coated piston, and there are 4 uniformly distributed restoration surface flow holes on the circumference of the restoration surface of the rubber-coated piston, and the compression surface flow holes and the restoration surface flow holes are arranged in an alternating manner; around each compression surface flow hole, a compression surface outer valve line and a compression surface inner valve line are sequentially arranged from outside to inside, and the two valve lines are connected to form an independent closed valve line; on the three sides of each restoration surface flow hole except near the center of the rubber-coated piston, a restoration surface outer valve line and a restoration surface inner valve line are sequentially arranged from outside to inside, and the restoration surface outer valve lines and the restoration surface inner valve lines of adjacent restoration surface flow holes are connected together to form a continuous closed valve line, and this continuous closed valve line is in the shape of a petal; the rubber-coated piston is sleeved with rubber coating.

[0008] Preferably, there are 4 restoration surface support bosses on the restoration surface of the rubber-coated piston, and the 4 restoration surface support bosses are respectively located at the side of the 4 restoration surface flow holes without the restoration surface outer valve line and the restoration surface inner valve line; there is an annular restoration surface boss at the center of the restoration surface of the rubber-coated piston.

[0009] Preferably, the height of the restoration surface boss is higher than the height of the restoration surface inner valve line, and the height of the restoration surface inner valve line is higher than the height of the restoration surface outer valve line.

[0010] Preferably, the compression surface of the rubber-coated piston is provided with four compression surface supporting bosses, which are staggered and evenly distributed with the compression surface flow holes, and an annular compression surface boss is provided at the center of the compression surface of the rubber-coated piston.

[0011] Preferably, the height of the compression surface boss is higher than the height of the valve line inside the compression surface, and the height of the valve line inside the compression surface is higher than the height of the valve line outside the compression surface.

[0012] Preferably, a piston large hole section, a piston transition section and a piston small hole section adapted to the piston rod end are sequentially arranged from left to right at the center of the rubber-coated piston.

[0013] Preferably, the piston rod end is composed of a boss, a large diameter section, a transition section and a small diameter section from left to right, respectively. The boss is in close contact with the compression support plate to achieve axial positioning of the valve system, the large diameter section has a clearance fit with the large hole section of the piston, the transition section has a clearance fit with the transition section of the piston, and the small diameter section has a clearance fit with the small hole section of the piston.

[0014] The beneficial effects of the utility model are as follows: the compression surface flow hole of the compression surface of the rubber-coated piston of the utility model is provided with a compression surface outer valve line and a compression surface inner valve line in sequence from the outside to the inside to form an independent valve line surface, so that the volume of the cavity storing the shock absorber oil before the piston is compressed to open the valve is smaller than the piston recovery surface, so that at the same speed, it has a faster pressure building speed, so that the pressure can be built up faster before the compression valve plate opens, and the NVH performance of the shock absorber piston rod is improved when the direction is reversed; the recovery surface flow hole of the recovery surface of the rubber-coated piston is provided with a recovery surface outer valve line and a recovery surface inner valve line in sequence from the outside to the inside to form a continuous valve line surface, and the inner and outer valve lines are respectively arranged on two circles to make the valve plate group open more smoothly.

[0015] The height of the restoration surface boss of the utility model is higher than the height of the valve line inside the restoration surface, the height of the valve line inside the restoration surface is higher than the height of the valve line outside the restoration surface, the height of the compression surface boss is higher than the height of the valve line inside the compression surface, and the height of the valve line inside the compression surface is higher than the height of the valve line outside the compression surface; after the nut is locked, due to the setting of the aforementioned valve line surface decreasing in height from inside to outside, the valve plate group that is in close contact with the piston valve line surface will present an inward convex state, when the piston valve system movement speed reaches the valve opening point, the valve plate group opens and forms a wider flow channel with the valve line surface to avoid the whistling noise generated when the oil passes through the gap, and the setting of the valve line surface at both ends gradually decreasing in height from inside to outside enables the valve plate to achieve a larger opening at the same speed when opening the valve at a low speed, so as to improve the NVH performance of the whole vehicle. The restoration surface support boss and the compression surface support boss can play a role in supporting the valve plate, effectively improving the durability of the valve plate group.

[0016] The boss of the present utility model is in close contact with the compression support piece to achieve the axial positioning of the valve train. The large-diameter section has a clearance fit with the large hole section of the piston, the transition section has a clearance fit with the transition section of the piston, and the small-diameter section has a clearance fit with the small hole section of the piston, which can avoid the wrong assembly direction of the piston. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only those of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is the exploded view of the present utility model;

[0019] Figure 2 is the schematic diagram of the end of the piston rod of the present utility model;

[0020] Figure 3 is the view of the compression surface of the rubber-coated piston of the present utility model;

[0021] Figure 4 is the view of the restoring surface of the rubber-coated piston of the present utility model.

[0022] The labels in the figure are:

[0023] 100 - end of the piston rod, 101 - boss, 102 - large-diameter section, 103 - transition section, 104 - small-diameter section, 2 - compression support piece, 3 - compression high-speed valve piece, 4 - compression valve piece group, 500 - rubber-coated piston, 501 - outer valve line of the compression surface, 502 - flow-through hole of the compression surface, 503 - inner valve line of the compression surface, 504 - boss of the compression surface, 505 - support boss of the compression surface, 506 - large hole section of the piston, 507 - transition section of the piston, 508 - small hole section of the piston, 509 - rubber coating, 510 - outer valve line of the restoring surface, 511 - support boss of the restoring surface, 512 - flow-through hole of the restoring surface, 513 - inner valve line of the restoring surface, 514 - boss of the restoring surface, 6 - restoring flow-through valve piece, 7 - restoring throttle valve piece, 8 - restoring valve piece group, 9 - restoring high-speed valve piece, 10 - restoring support piece, 11 - restoring gasket, 12 - nut. Detailed Embodiment

[0024] To make the purpose, technical solutions and advantages of the present utility model more clear and understandable, the following further details the present utility model in combination with specific embodiments.

[0025] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this utility model shall have the ordinary meanings understood by those with ordinary skills in the field to which this utility model belongs. The "first", "second" and similar words used in this utility model do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0026] Such as Figures 1 to 4As shown in the figure, a piston valve system for improving the NVH performance of an automotive shock absorber includes a piston rod end 100, a compression support plate 2, a compression high-speed valve plate 3, a compression valve plate group 4, a rubber-coated piston 500, a rebound flow valve plate 6, a rebound throttle valve plate 7, a rebound valve plate group 8, a rebound high-speed valve plate 9, a rebound support plate 10, a rebound gasket 11, and a nut 12. The compression support plate 2, compression high-speed valve plate 3, compression valve plate group 4, rubber-coated piston 500, rebound flow valve plate 6, rebound throttle valve plate 7, rebound valve plate group 8, rebound high-speed valve plate 9, rebound support plate 10, and rebound gasket 11 are sequentially assembled on the piston rod end 100 from left to right, and the overall valve system is locked by the nut 12. Four evenly distributed compression surface flow holes 502 are provided on the circumference of the compression surface of the rubber-coated piston 500, and four evenly distributed rebound surface flow holes 512 are provided on the circumference of the rebound surface of the rubber-coated piston 500. The compression surface flow holes 502 and the rebound surface flow holes 512 are arranged in a staggered manner. Around each compression surface flow hole 502, a compression surface outer valve line 501 and a compression surface inner valve line 503 are sequentially provided from the outside to the inside, and the two valve lines are connected to form an independent closed valve line. On the three sides of each rebound surface flow hole 512 except for the side close to the center of the rubber-coated piston 500, a rebound surface outer valve line 510 and a rebound surface inner valve line 513 are sequentially provided from the outside to the inside. The rebound surface outer valve lines 510 and the rebound surface inner valve lines 513 of adjacent rebound surface flow holes 512 are connected together to form a continuous closed valve line, and this continuous closed valve line is in the shape of a petal. The rubber-coated piston 500 is sleeved with rubber coating 509. Around the compression surface flow holes 502 on the compression surface of the rubber-coated piston 500, a compression surface outer valve line 501 and a compression surface inner valve line 503 are sequentially provided from the outside to the inside to form an independent valve line surface, so that the volume of the cavity storing the shock absorber oil before the piston compression valve opens is smaller than the piston rebound surface. Thus, at the same speed, a faster pressure build-up speed is achieved, enabling faster pressure build-up before the compression valve plate opens and improving the NVH performance when the shock absorber piston rod changes direction. On the three sides of the rebound surface flow holes 512 on the rebound surface of the rubber-coated piston 500 except for the side close to the center of the rubber-coated piston 500, a rebound surface outer valve line 510 and a rebound surface inner valve line 513 are sequentially provided from the outside to the inside to form a continuous valve line surface. Setting the inner and outer valve lines on two circumferences respectively can make the valve plate group open more smoothly.

[0027] Four rebound surface support bosses 511 are provided on the rebound surface of the rubber-coated piston 500, and the four rebound surface support bosses 511 are respectively located at the sides of the four rebound surface flow holes 512 where there are no rebound surface outer valve lines 510 and rebound surface inner valve lines 513. Four compression surface support bosses 505 are provided on the compression surface of the rubber-coated piston 500, and they are evenly distributed in a staggered manner with the compression surface flow holes 502. The rebound surface support bosses 511 and the compression surface support bosses 505 can play a role in supporting the valve plates and effectively improve the durability of the valve plate group.

[0028] An annular restoring surface boss 514 is provided at the center of the restoring surface of the rubber-coated piston 500. The height of the restoring surface boss 514 is higher than the height of the valve line 513 inside the restoring surface, and the height of the valve line 513 inside the restoring surface is higher than the height of the valve line 510 outside the restoring surface. An annular compression surface boss 504 is provided at the center of the compression surface of the rubber-coated piston 500. The height of the compression surface boss 504 is higher than the height of the valve line 503 inside the compression surface, and the height of the valve line 503 inside the compression surface is higher than the height of the valve line 501 outside the compression surface. After the nut is tightened, due to the setting of the aforementioned valve line surface decreasing in height from the inside to the outside, the valve plate group that is in close contact with the piston valve line surface will present an inward convex state. When the movement speed of the piston valve system reaches the valve opening point, the valve plate group opens and forms a wider flow channel with the valve line surface to avoid the whistling noise when the oil passes through the gap. The setting of the valve line surfaces at both ends gradually decreasing in height from the inside to the outside enables the valve plate to achieve a larger opening at the same speed when opening the valve at a low speed, thereby improving the NVH performance of the entire vehicle.

[0029] The center of the rubber-coated piston 500 is provided with a piston large hole section 506, a piston transition section 507 and a piston small hole section 508 adapted to the piston rod end 100 from left to right. The piston rod end 100 is respectively provided with a boss 101, a large diameter section 102, a transition section 103 and a small diameter section 104 from left to right. The boss 101 is in close contact with the compression support sheet 2 to achieve the axial positioning of the valve system. The large diameter section 102 is in clearance with the piston large hole section 506, the transition section 103 is in clearance with the piston transition section 507, and the small diameter section 104 is in clearance with the piston small hole section 508, so as to avoid the piston direction assembly error.

[0030] A person skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A piston valve system for improving the NVH performance of an automotive shock absorber, comprising a piston rod end (100), a compression support plate (2), a compression high-speed valve plate (3), a compression valve plate group (4), a rubber-coated piston (500), a rebound flow valve plate (6), a rebound throttle valve plate (7), a rebound valve plate group (8), a rebound high-speed valve plate (9), a rebound support plate (10), a rebound gasket (11), and a nut (12), characterized in that, On the end of the piston rod (100), a compression support sheet (2), a compression high-speed valve sheet (3), a compression valve sheet group (4), a rubber-coated piston (500), a restoration flow valve sheet (6), a restoration throttle valve sheet (7), a restoration valve sheet group (8), a restoration high-speed valve sheet (9), a restoration support sheet (10), and a restoration gasket (11) are assembled in sequence from left to right. The overall valve system is locked by a nut (12); on the circumference of the compression surface of the rubber-coated piston (500), 4 evenly distributed compression surface flow holes (502) are provided. On the circumference of the restoration surface of the rubber-coated piston (500), 4 evenly distributed restoration surface flow holes (512) are provided. The compression surface flow holes (502) and the restoration surface flow holes (512) are arranged in an alternating manner; around each compression surface flow hole (502), a compression surface outer valve line (501) and a compression surface inner valve line (503) are sequentially provided from outside to inside. After the two valve lines are connected, an independent closed valve line is formed; on the three sides of each restoration surface flow hole (512) except for the side close to the center of the rubber-coated piston (500), a restoration surface outer valve line (510) and a restoration surface inner valve line (513) are sequentially provided from outside to inside. The restoration surface outer valve lines (510) and the restoration surface inner valve lines (513) of adjacent restoration surface flow holes (512) are connected together to form a continuous closed valve line, and this continuous closed valve line is in the shape of a petal; the rubber-coated piston (500) is sleeved with rubber coating (509).

2. The piston valve system for improving the NVH performance of an automotive shock absorber according to claim 1, wherein, On the restoration surface of the rubber-coated piston (500), 4 restoration surface support bosses (511) are provided. The 4 restoration surface support bosses (511) are respectively located at the side of the 4 restoration surface flow holes (512) where there is no restoration surface outer valve line (510) and restoration surface inner valve line (513); at the center of the restoration surface of the rubber-coated piston (500), an annular restoration surface boss (514) is provided.

3. The piston valve system for improving the NVH performance of an automotive shock absorber according to claim 2, wherein, The height of the restoration surface boss (514) is higher than the height of the restoration surface inner valve line (513), and the height of the restoration surface inner valve line (513) is higher than the height of the restoration surface outer valve line (510).

4. The piston valve system for improving the NVH performance of an automotive shock absorber according to claim 3, characterized in that, On the compression surface of the rubber-coated piston (500), 4 compression surface support bosses (505) are provided, which are evenly distributed in an alternating manner with the compression surface flow holes (502). At the center of the compression surface of the rubber-coated piston (500), an annular compression surface boss (504) is provided.

5. The piston valve system for improving the NVH performance of an automotive shock absorber according to claim 4, wherein The height of the compression surface boss (504) is higher than the height of the compression surface inner valve line (503), and the height of the compression surface inner valve line (503) is higher than the height of the compression surface outer valve line (501).

6. The piston valve system for improving the NVH performance of an automotive shock absorber according to claim 1, characterized in that, At the center of the rubber-coated piston (500), a piston large hole section (506), a piston transition section (507), and a piston small hole section (508) that are adapted to the end of the piston rod (100) are sequentially provided from left to right.

7. The piston valve system for improving the NVH performance of an automotive shock absorber according to claim 6, wherein, The piston rod end (100) is successively from left to right a boss (101), a large-diameter section (102), a transition section (103) and a small-diameter section (104). The boss (101) is in close contact with the compression support piece (2) to achieve the axial positioning of the valve train. The large-diameter section (102) has a clearance fit with the large piston hole section (506), the transition section (103) has a clearance fit with the piston transition section (507), and the small-diameter section (104) has a clearance fit with the small piston hole section (508).

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