Rear damping piston combination for universal shock absorber

Abstract

The utility model discloses a rear damping piston assembly for a universal shock absorber. The rear damping piston assembly comprises a piston upper body and a piston lower body which are coaxially formed with a central through hole in a penetrating manner, the piston upper body and the piston lower body are both an integral piece formed by iron-based powder metallurgy materials in a high-pressure die-casting mode, a concave top face assembling concave cavity is formed in the top face of the piston lower body, and the lower end of the piston upper body is fixed in the top face assembling concave cavity in a press-fitting mode. A sealing rubber sleeve is wrapped on the peripheral face of the lower piston body, a guide-in inclined face is formed on the periphery of the bottom face of the sealing rubber sleeve, an elastic sealing ring is arranged at the upper end of the sealing rubber sleeve, and a variable capacity space which is attached to the lower piston body when the elastic sealing ring is pressed in the radial direction is reserved between the elastic sealing ring and the peripheral face of the lower piston body. The utility model has the advantages of low manufacturing cost, stable product molding size, high assembly precision and good sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive shock absorbers, in particular to a rear shock absorber piston assembly for a general vehicle model applied to shock absorbers of Xijian Automobile, specifically a rear shock absorber piston assembly for a general shock absorber. Background Art

[0002] An automotive shock absorber is an important component installed on an automobile to reduce the vibration of the vehicle frame. An automotive shock absorber usually consists of an oil cylinder, a piston, a piston rod, and a spring. In the prior art, the rear shock absorber pistons are made of steel by machining processes. Such front shock absorber pistons have numerous processing steps, low production efficiency, and relatively poor dimensional stability. In particular, for the rear shock absorber pistons of traditional shock absorbers, in order to ensure the sealing performance of their circumferential surfaces, the circumferential surfaces of the processed pistons need to be further polished and other treatments, resulting in very high processing costs. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a rear shock absorber piston assembly for a general shock absorber with low manufacturing cost, good sealing performance, and stable product dimensions in view of the above-mentioned prior art status.

[0004] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0005] A rear shock absorber piston assembly for a general shock absorber includes a piston upper body and a piston lower body that are coaxially formed with a central through hole. Both the piston upper body and the piston lower body are integral parts die-cast by a high-pressure die-casting process using an iron-based powder metallurgy material. A concave top surface assembly cavity for positioning and assembling the piston upper body is formed on the top surface of the piston lower body, and the lower end of the piston upper body is press-fitted and fixed in the top surface assembly cavity. A sealing rubber sleeve made of a polytetrafluoroethylene material is coated on the outer circumferential surface of the piston lower body by a plastic coating process. An introduction inclined surface that is convenient for guiding into the cylinder barrel during assembly is formed on the periphery of the bottom surface of the sealing rubber sleeve. The upper end of the sealing rubber sleeve has an elastic sealing ring with a horn-shaped structure, and a deformation space is left between the elastic sealing ring and the outer circumferential surface of the piston lower body for the elastic sealing ring to be pressed radially against the piston lower body.

[0006] To optimize the above technical solution, the following measures are also included:

[0007] A circular groove is formed around the central through hole on the top surface of the piston upper body. Five arc-shaped upper body channels are processed downwardly through the circular groove, and the circumferential distance between two adjacent arc-shaped upper body channels is 72°.

[0008] Five arc-shaped lower body channels are processed downwardly through the top surface assembly cavity of the piston lower body with equal radian. The arc-shaped lower body channels are connected to the arc-shaped upper body channels in a one-to-one correspondence up and down to form a first channel.

[0009] The bottom surface of the piston upper body is formed with five concave trapezoidal notch channels with equal arcs, and the trapezoidal notch channels and the lower channel openings of the arc-shaped upper body channels are arranged in a staggered manner on the bottom surface of the piston upper body.

[0010] The top surface assembly cavity of the piston lower body is formed with five trapezoidal step-type channels penetrating downward with a medium arc, and the trapezoidal step-type channels are connected with the trapezoidal notch-type channels one by one in the upper and lower parts to form a second channel.

[0011] After the piston upper body and the piston lower body are press-fitted and fixed, the notch of the trapezoidal notch-type channel forms a radial oil port arranged on the peripheral surface of the piston upper body and connected to the second channel.

[0012] The bottom surface of the piston lower body is formed with a bottom surface assembly cavity, in which a sealing convex ring is formed for dividing the lower channel opening of the arc-shaped lower body channel and the lower channel opening of the trapezoidal step-type channel into two different chambers.

[0013] The outer peripheral surface of the piston lower body is formed with a plurality of anti-skid grooves for increasing the contact area between the sealing rubber sleeve and the piston lower body, and an anti-skid convex ring is formed between two adjacent anti-skid grooves.

[0014] Compared with the prior art, the rear reduction piston assembly of the utility model is composed of a piston upper body, a piston lower body and a sealing rubber sleeve; wherein: the piston upper body and the piston lower body are both an integral part formed by high-pressure die-casting process using iron-based powder metallurgy materials. The piston upper body and piston lower body formed by iron-based powder are stable in size, low in manufacturing cost, and high in assembly precision. The sealing rubber sleeve is coated on the outer peripheral surface of the piston lower body and is integrated with the piston lower body. The material of the sealing rubber sleeve is polytetrafluoroethylene material. Polytetrafluoroethylene has excellent chemical stability, corrosion resistance, sealing, high lubricity and non-stickiness, and good anti-aging resistance. Therefore, it not only has good sealing performance, but also can greatly extend the service life of the rear reduction piston assembly. There is still a variable space between the elastic sealing ring at the upper end of the sealing rubber sleeve and the outer peripheral surface of the piston lower body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional structural diagram of the utility model;

[0016] Figure 2 It is a bottom view of the upper body of the piston of the utility model;

[0017] Figure 3 yes Figure 2 AA section view;

[0018] Figure 4 It is a structural schematic diagram of the top surface of the lower body of the piston of the utility model;

[0019] Figure 5 yesFigure 4 Rear view;

[0020] Figure 6 is a sectional view structure diagram of the lower body of the piston of the present utility model;

[0021] Figure 7 is Figure 6 a partial enlarged schematic view of part Ⅰ in

[0022] Figure 8 is a three - dimensional structure schematic diagram of the present utility model;

[0023] Figure 9 is a three - dimensional schematic diagram of the upper body of the piston of the present utility model when viewed from the bottom;

[0024] Figure 10 is a three - dimensional schematic diagram of the lower body of the piston of the present utility model when viewed from the top. Specific embodiments

[0025] The following further describes the embodiments of the present utility model in detail with reference to the accompanying drawings.

[0026] Figures 1 to 10 is a structure schematic diagram of the present utility model.

[0027] The reference numerals therein are: central through - hole K, variable volume space S, upper body of piston 1, annular groove 1a, arc - shaped upper body channel 1b, trapezoidal notch - type channel 1c, radial oil port 1e, lower body of piston 2, top surface assembly cavity 2a, arc - shaped lower body channel 2b, trapezoidal step - type channel 2c, bottom surface assembly cavity 21, sealing convex ring 22, anti - slip convex ring 23, sealing rubber sleeve 3, guiding inclined surface 31, elastic sealing ring 32.

[0028] As Figures 1 to 10 shown, the present utility model discloses a rear shock absorber piston assembly for a general - type shock absorber, which can be applied to the Xijian general - type automotive shock absorber. It includes an upper body of piston 1 and a lower body of piston 2 that are coaxially and through - formed with a central through - hole K. Both the upper body of piston 1 and the lower body of piston 2 are integral parts die - cast by using a high - pressure die - casting process with an iron - based powder metallurgy material. The upper body of piston 1 and the lower body of piston 2 formed by the iron - based powder metallurgy material have simple manufacturing processes and stable product forming dimensions. From Figure 4 , Figure 6 and Figure 10As can be seen, a concave top surface assembly cavity 2a is formed on the top surface of the lower piston body 2. The top surface assembly cavity 2a is used to position and assemble the upper piston body 1 to prevent the upper piston body 1 from radially shifting. The lower end of the upper piston body 1 is installed in the top surface assembly cavity 2a by press-fitting to form an integral body with the lower piston body 2. A sealing rubber sleeve 3 made of polytetrafluoroethylene material is coated on the outer peripheral surface of the lower piston body 2 by a plastic coating process. The sealing rubber sleeve 3 is directly coated on the lower piston body 2 and fixed to form an integral body with the lower piston body 2. Polytetrafluoroethylene material has chemical stability, corrosion resistance, sealing performance, high lubricity and non-stickiness, and good anti-aging endurance. Therefore, the sealing rubber sleeve 3 can ensure the sealing performance between the rear shock absorber piston assembly and the cylinder wall after installation, and improve the service life of the rear shock absorber piston assembly.

[0029] To facilitate the installation of the sealing rubber sleeve 3 and the cylinder, as Figure 7 shown, an introduction inclined surface 31 for facilitating introduction into the cylinder during assembly is formed on the peripheral edge of the bottom surface of the sealing rubber sleeve 3. The upper end of the sealing rubber sleeve 3 has an elastic sealing ring 32 with a flared structure. A circumferential accommodation space S is left between the elastic sealing ring 32 and the outer peripheral surface of the lower piston body 1. After the elastic sealing ring 32 is subjected to a radial binding force from the cylinder, the accommodation space S allows the elastic sealing ring 32 to elastically adhere to the lower piston body 2, so that the elastic sealing ring 32 of the sealing rubber sleeve 3 can always maintain a certain pressure contact with the inner wall of the cylinder, achieving the purpose of improving the sealing performance.

[0030] In the embodiment, please continue to refer to Figure 7 , multiple circumferential anti-slip grooves for enhancing the contact area between the sealing rubber sleeve 3 and the lower piston body 2 are also formed on the outer peripheral surface of the lower piston body 2 of the present utility model. An anti-slip convex ring 23 is formed between two adjacent anti-slip grooves. The anti-slip grooves and the anti-slip convex ring 23 are provided. When the sealing rubber sleeve 3 is injection-molded, a limiting convex block that can be caught in the anti-slip groove is formed on the inner circumference of the sealing rubber sleeve 3. The engagement between the limiting convex block and the anti-slip convex ring 23 can effectively prevent the sealing rubber sleeve 3 from moving circumferentially and axially.

[0031] In the embodiment, as Figure 1 , Figure 3 and Figure 8 shown, a circumferential concave annular groove 1a is formed on the top surface of the upper piston body 1 around the central through hole K. Five arc-shaped upper body channels 1b are processed through the annular groove 1a downward, and the circumferential distance between two adjacent arc-shaped upper body channels 1b is 72°. As can be seen from Figure 2 , the angle of the arc length of the arc-shaped upper body channel 1b is 34°.

[0032] In the embodiment, as Figure 1 , Figure 4 , Figure 6 and Figure 10As shown, five downwardly penetrating arc-shaped lower body channels 2b are machined in the top surface assembly cavity 2a of the lower piston body 2 with a medium arc. The arc-shaped lower body channels 2b are correspondingly connected to the arc-shaped upper body channels 1b one by one from top to bottom. The arc-shaped upper body channels 1b and the arc-shaped lower body channels 2b are sequentially connected to form the first channel of the oil path. The angle of the arc length of the arc-shaped lower body channels 2b is also 34°.

[0033] In the embodiment, as Figure 2 、 Figure 3 and Figure 9 shown, five inwardly concave trapezoidal notch-type channels 1c are formed on the bottom surface of the upper piston body 1 with a medium arc. The trapezoidal notch-type channels 1c leave a notch on the circumferential surface of the upper piston body 1. The trapezoidal notch-type channels 1c and the lower channel openings of the arc-shaped upper body channels 1b are arranged in a staggered manner on the bottom surface of the upper piston body 1. The angle of the arc length of the trapezoidal notch-type channels 1c is 25°.

[0034] In the embodiment, as Figure 1 、 Figure 4 、 Figure 6 and Figure 10 shown, five trapezoidal stepped channels 2c are formed in the top surface assembly cavity 2a of the lower piston body 2 with a medium arc and penetrate downward. The trapezoidal stepped channels 2c are correspondingly connected to the trapezoidal notch-type channels 1c one by one from top to bottom. The trapezoidal notch-type channels 1c and the trapezoidal stepped channels 2c are sequentially connected to form the second channel of the oil path. The angle of the arc length of the trapezoidal stepped channels 2c is also 25°.

[0035] In the embodiment, as Figure 8 shown, after the upper piston body 1 and the lower piston body 2 are press-fitted and fixed, the notch of the trapezoidal notch-type channel 1c forms a radial oil port 1e provided on the circumferential surface of the upper piston body 1 to communicate with the second channel.

[0036] In the embodiment, as Figure 1 、 Figure 5 and Figure 6 shown, a bottom surface assembly cavity 21 is formed on the bottom surface of the lower piston body 2. A sealing convex ring 22 is formed in the bottom surface assembly cavity 21 for separating the lower channel openings of the arc-shaped lower body channels 2b and the trapezoidal stepped channels 2c into two different chambers. The sealing convex ring 22 can ensure the sealing between the first channel and the second channel after assembly.

[0037] The best embodiment of the present invention has been described. All changes or modifications made by those of ordinary skill in the art will not depart from the scope of the present invention.

Claims

1. A rear shock piston assembly for a general-purpose shock absorber, comprising an upper piston body (1) and a lower piston body (2) coaxially and throughly formed with a central through hole (K); characterized in that: The upper piston body (1) and the lower piston body (2) are both integral parts die-cast from an iron-based powder metallurgy material by a high-pressure die-casting process. A concave top surface assembly cavity (2a) for positioning and assembling the upper piston body (1) is formed on the top surface of the lower piston body (2), and the lower end of the upper piston body (1) is press-fitted and fixed in the top surface assembly cavity (2a); A sealing rubber sleeve (3) made of polytetrafluoroethylene material is coated on the outer peripheral surface of the lower piston body (2) by a plastic coating process. An introduction inclined surface (31) convenient for introduction into the cylinder barrel during assembly is formed on the periphery of the bottom surface of the sealing rubber sleeve (3). The upper end of the sealing rubber sleeve (3) has an elastic sealing ring (32) with a trumpet-shaped structure. A variable volume space (S) is left between the elastic sealing ring (32) and the outer peripheral surface of the lower piston body (1), which is pressed against the lower piston body (2) when the elastic sealing ring (32) is radially compressed.

2. The rear shock piston assembly for a general-purpose shock absorber according to claim 1, characterized in that: A circular groove (1a) is formed around the central through hole (K) on the top surface of the upper piston body (1), and five arc-shaped upper body channels (1b) are processed through the circular groove (1a) downward, and the circumferential distance between two adjacent arc-shaped upper body channels (1b) is 72°.

3. The rear shock piston assembly for a general-purpose shock absorber according to claim 2, characterized in that: Five arc-shaped lower body channels (2b) are processed through the top surface assembly cavity (2a) of the lower piston body (2) with equal radian, and the arc-shaped lower body channels (2b) are connected to the arc-shaped upper body channels (1b) one by one up and down to form a first channel.

4. The combined rear shock piston for a general shock absorber according to claim 3, characterized in that: Five concave trapezoidal notch channels (1c) are formed on the bottom surface of the upper piston body (1) with equal radian, and the lower channel openings of the trapezoidal notch channels (1c) and the arc-shaped upper body channels (1b) are arranged in a staggered manner on the bottom surface of the upper piston body (1).

5. A rear shock piston assembly for a general-purpose shock absorber according to claim 4, characterized in that: Five trapezoidal stepped channels (2c) are formed through the top surface assembly cavity (2a) of the lower piston body (2) with equal radian downward, and the trapezoidal stepped channels (2c) are connected to the trapezoidal notch channels (1c) one by one up and down to form a second channel.

6. The rear shock piston assembly for a general-purpose shock absorber according to claim 5, characterized in that: After the upper piston body (1) and the lower piston body (2) are press-fitted and fixed, the notch of the trapezoidal notch channel (1c) forms a radial oil port (1e) provided on the circumferential surface of the upper piston body (1) and communicating with the second channel.

7. A rear shock piston assembly for a general-purpose shock absorber according to claim 6, characterized in that: A bottom surface assembly cavity (21) is formed on the bottom surface of the lower piston body (2), and a sealing convex ring (22) for separating the lower channel openings of the arc-shaped lower body channels (2b) and the lower channel openings of the trapezoidal stepped channels (2c) into two different chambers is formed in the bottom surface assembly cavity (21).

8. A rear shock piston assembly for a general-purpose shock absorber according to claim 7, characterized in that: Multiple anti-slip grooves for enhancing the contact area between the sealing rubber sleeve (3) and the lower piston body (2) are formed on the outer peripheral surface of the lower piston body (2), and anti-slip convex rings (23) are formed between two adjacent anti-slip grooves.

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