Air spring piston

Abstract

The utility model discloses an air spring piston which comprises a piston body (1) and a piston sleeve (2), the outer wall of the piston body (1) is provided with a first annular protruding strip (6), the inner wall of the piston sleeve (2) is provided with a plurality of first protruding strips (7) arranged in the height direction, and the adjacent first protruding strips (7) are arranged at intervals. The piston sleeve (2) is arranged outside the outer wall of the middle of the piston body (1) in a sleeved mode, one end of the piston sleeve (2) abuts against the first annular protruding strips (6), the other end of the piston sleeve (2) and the outer wall of the piston body (1) are provided with axial positioning structures, and the axial positioning structures are installed on one or more first protruding strips (7). According to the air spring piston, the axial limiting structure is additionally arranged, the connecting structure between the piston sleeve and the piston body is not affected, and the axial limiting structure is simple, good in reliability and convenient to machine.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile parts, and specifically relates to an air spring piston. BACKGROUND

[0002] The air spring piston in the automobile shock absorber is the core component of the air suspension system. The working principle is: air pressure adjustment: the air cavity volume is changed through the up-down movement of the piston, thereby adjusting the air pressure. When the vehicle load increases, the ECU controls the air pump to inflate, the piston is pressed to move up, and the vehicle body height is maintained; in the bumpy section, the piston responds quickly to absorb the vibration. Self-adaptive stiffness: the spring stiffness is directly changed by the air pressure change, the stiffness is increased to enhance the stability at high speed, and the stiffness is reduced to improve the comfort at low speed. The outer wall of the body of the air spring piston of the prior art is provided with a piston sleeve, the piston sleeve is tightly attached to the outer wall of the piston body by relying on the elastic force of the piston sleeve after assembly, and although there is locking force in the working process, the axial limiting property is poor, and the piston sleeve is easily axially slid after long-term work, and cannot work normally. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide an air spring piston with an axial limiting structure, without affecting the connecting structure between the piston sleeve and the piston body, and with simple axial limiting structure, good reliability, and convenient processing.

[0004] The technical scheme of the utility model is to provide an air spring piston with the following structure, which comprises a piston body and a piston sleeve, the piston body is provided with a center hole, one end of the piston body is provided with a first connecting end, the other end is provided with a second connecting end, the first connecting end is connected with a shock absorber, the second connecting end is connected with a top cover provided with an air chamber, the outer wall of the piston body is provided with a first annular convex strip, the inner wall of the piston sleeve is provided with a plurality of first convex strips arranged in the height direction, and the first convex strips between adjacent ones are provided with a spacing; the piston sleeve is sleeved outside the outer wall of the middle part of the piston body, one end of the piston sleeve is in abutment with the first annular convex strip, and all the first convex strips are in abutment with the outer wall of the piston body, so that a space is formed between the inner wall of the piston sleeve and the outer wall of the piston body; the other end of the piston sleeve and the outer wall of the piston body are provided with an axial positioning structure, and the axial positioning structure is installed on one or more than one first convex strip.

[0005] The axial positioning structure comprises a first arc-shaped protrusion and a second arc-shaped protrusion arranged on the inner wall of the piston body, and a third arc-shaped protrusion and a fourth arc-shaped protrusion arranged on the piston sleeve, the first arc-shaped protrusion and the second arc-shaped protrusion are located in the same arc, and a long groove parallel to the axis of the piston body is arranged between the first arc-shaped protrusion and the second arc-shaped protrusion, the first protrusion between the third arc-shaped protrusion and the fourth arc-shaped protrusion of the piston sleeve is embedded in the long groove after the piston sleeve is sleeved on the piston body, and meanwhile, the bottom of the third arc-shaped protrusion abuts against the top surface of the first arc-shaped protrusion, and the bottom of the fourth arc-shaped protrusion abuts against the top surface of the second arc-shaped protrusion.

[0006] The outer wall of the piston body is provided with the outer wall of one end of the piston sleeve, and a plurality of second annular protrusions are arranged at intervals.

[0007] The first arc-shaped protrusion and the second arc-shaped protrusion are located on the side wall of the second annular protrusion at the bottom.

[0008] The end port of the piston sleeve connected with the shock absorber is radially inwardly contracted, and the side wall of the outermost second annular protrusion at the end is wrapped.

[0009] After the above structure is adopted, the piston sleeve has the following advantages: the other end of the piston sleeve and the outer wall of the piston body are provided with an axial positioning structure, the axial limiting structure is increased, the connection structure between the piston sleeve and the piston body is not affected, the mechanical interlocking is formed between the corresponding structure of the inner wall of the piston sleeve, the axial displacement is limited, the axial limiting structure is simple, the reliability is good, and the machining is convenient. In addition, the axial positioning structure is installed on more than one first protrusion, the axial positioning structure and the first protrusion are combined, the strength of the axial positioning structure is better, the axial limiting structure is directly embedded in the first protrusion, the original strength of the protrusion is utilized to disperse the axial stress, local stress concentration is avoided, and the connection strength of the piston sleeve and the piston body is increased.

[0010] As an improvement, the axial positioning structure comprises a first arc-shaped protrusion and a second arc-shaped protrusion arranged on the inner wall of the piston body, and a third arc-shaped protrusion and a fourth arc-shaped protrusion arranged on the piston sleeve, the first arc-shaped protrusion and the second arc-shaped protrusion are located in the same arc, and a long groove parallel to the axis of the piston body is arranged between the first arc-shaped protrusion and the second arc-shaped protrusion, the first protrusion between the third arc-shaped protrusion and the fourth arc-shaped protrusion of the piston sleeve is embedded in the long groove after the piston sleeve is sleeved on the piston body, and meanwhile, the bottom of the third arc-shaped protrusion abuts against the top surface of the first arc-shaped protrusion, and the bottom of the fourth arc-shaped protrusion abuts against the top surface of the second arc-shaped protrusion, the positioning structure is simple, the face-to-face positioning of the protrusions is utilized, the limiting effect is good, and the strength is sufficient; in addition, the protrusions simultaneously bear the functions of circumferential connection and axial limiting, and the structural efficiency is improved.

[0011] As improvement, the outer wall of the piston body is provided with a plurality of second annular protrusions which are spaced apart and arranged on the outer wall of the one end of the piston sleeve, the second annular protrusions are in abutment with the first protrusions at the corresponding positions, so that the outer wall of the piston body and the surface of the piston sleeve are in abutment in a line and surface mode, the contact area is reduced, and the abutting force of the two is increased.

[0012] As improvement, the end port of the piston sleeve which is connected with the shock absorber is radially inwardly contracted, and wraps the side wall of the outermost second annular protrusion at the end, so that the axial positioning of the two is further increased. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic view of the air spring piston according to the present application from view angle one.

[0014] Figure 2 It is a schematic view of the air spring piston according to the present application from view angle two.

[0015] Figure 3 It is a schematic view of the air spring piston according to the present application from view angle two.

[0016] Figure 4 It is a schematic view of the air spring piston according to the present application from view angle two.

[0017] Figure 5 It is a schematic view of the air spring piston according to the present application from view angle two. Figure 4

[0018] Figure 6 It is a schematic view of the air spring piston according to the present application from view angle two.

[0019] Figure 7 It is a schematic view of the air spring piston according to the present application from view angle two.

[0020] Figure 8 It is a schematic view of the air spring piston according to the present application from view angle two.

[0021] As shown in the drawings: 1, piston body, 2, piston sleeve, 3, center hole, 4, first connecting end, 5, second connecting end, 6, first annular protrusion, 7, first protrusion, 8, first arc-shaped protrusion, 9, second arc-shaped protrusion, 10, third arc-shaped protrusion, 11, fourth arc-shaped protrusion, 12, long groove, 13, second annular protrusion. DETAILED DESCRIPTION

[0022] The present application will be further described below in conjunction with the drawings.

[0023] As shown in the drawings: 1, piston body, 2, piston sleeve, 3, center hole, 4, first connecting end, 5, second connecting end, 6, first annular protrusion, 7, first protrusion, 8, first arc-shaped protrusion, 9, second arc-shaped protrusion, 10, third arc-shaped protrusion, 11, fourth arc-shaped protrusion, 12, long groove, 13, second annular protrusion. Figures 1-8 ​The utility model discloses an air spring piston, including piston body 1 and piston cover 2, the piston body 1 is equipped with center hole 3, one end of piston body 1 is equipped with first connecting end 4, the other end is equipped with second connecting end 5, first connecting end 4 is connected with shock absorber, second connecting end 5 is connected with the top cap of air chamber, the outer wall of piston body 1 is equipped with first annular convex strip 6. First annular convex strip 6 is close to first connecting end 4, and the outer diameter of this section is protruding with piston body 1. The bottom surface of first annular convex strip 6 forms a step surface with piston body 1, and one end of piston cover 2 abuts to be positioned axially.

[0024] As Figures 4-6 The inner wall of piston cover 2 is equipped with a plurality of first convex strips 7 arranged along the height direction, and the first convex strips 7 between adjacent ones are spaced apart; the first convex strips 7 function as reinforcing ribs and can also ensure the spacing between the piston cover 2 and the piston body. The piston cover 2 is sleeved on the outer wall of the middle part of the piston body 1, one end of the piston cover 2 abuts against the first annular convex strip 6, and the outer wall of the piston body 1 is abutted by all the first convex strips 7, so that a space is formed between the inner wall of the piston cover 2 and the outer wall of the piston body 1; characterized in that: the other end of the piston cover 2 and the outer wall of the piston body 1 are provided with an axial positioning structure, and the axial positioning structure is mounted on one or more than one first convex strip 7, so as to disperse the axial stress by using the original strength of the first convex strip 7 and avoid local stress concentration, thereby increasing the connection strength of the piston cover 2 and the piston body 1.

[0025] As Figure 7 The axial positioning structure includes a first arc-shaped convex strip 8 and a second arc-shaped convex strip 9 arranged on the inner wall of the piston body 1, and a third arc-shaped convex strip 10 and a fourth arc-shaped convex strip 11 arranged on the piston cover 2; the first arc-shaped convex strip 8 and the second arc-shaped convex strip 9 are located in the same arc and have a long groove 12 parallel to the axis of the piston body 1 arranged therebetween; after the piston cover 2 is sleeved on the piston body 1, the first convex strip 7 located between the third arc-shaped convex strip 10 and the fourth arc-shaped convex strip 11 is embedded in the long groove 12; in addition, the first convex strip 7 simultaneously functions as a circumferential connection and an axial limiting structure, thereby improving the structural efficiency. Meanwhile, the bottom of the third arc-shaped convex strip 10 abuts against the top surface of the first arc-shaped convex strip 8, and the bottom of the fourth arc-shaped convex strip 11 abuts against the top surface of the second arc-shaped convex strip 9; the axial positioning is realized by the abutment of the top surface and the bottom surface, so that the two ends of the piston cover 2 are axially positioned, thereby preventing the piston cover 2 from axially sliding and circumferentially rotating on the piston body 1.

[0026] As Figure 7As shown, the outer wall of the piston body 1 is provided with a plurality of second annular protrusions 13 distributed at intervals on the outer wall of one end of the piston sleeve 2. The plurality of second annular protrusions 13 can reduce the contact area between the outer wall of the piston body 1 and the inner wall of the piston sleeve 2, thereby increasing the close degree of the two, and the second annular protrusions 13 are all in abutment with the first protrusions 7 at corresponding positions,

[0027] The first arc-shaped protrusions 8 and the second arc-shaped protrusions 9 are located on the side walls of the second annular protrusions 13 at the bottom.

[0028] The end port of the piston sleeve 2 connected with the shock absorber is radially inwardly contracted and wraps the side walls of the outermost second annular protrusions 13 at the end.

Claims

1. An air spring piston, comprising a piston body (1) and a piston sleeve (2), the piston body (1) is provided with a central hole (3), one end of the piston body (1) is provided with a first connecting end (4), the other end is provided with a second connecting end (5), the first connecting end (4) is connected with a shock absorber, the second connecting end (5) is connected with a top cover provided with a gas chamber, the outer wall of the piston body (1) is provided with a first annular convex strip (6), the inner wall of the piston sleeve (2) is provided with a plurality of first convex strips (7) arranged along the height direction, the first convex strips (7) between adjacent ones are provided with a spacing; the piston sleeve (2) is sleeved on the outer wall of the middle part of the piston body (1), one end of the piston sleeve (2) is abutted against the first annular convex strip (6), all the first convex strips (7) are abutted against the outer wall of the piston body (1) so that the inner wall of the piston sleeve (2) and the outer wall of the piston body (1) are provided with a space; characterized in that: The other end of the piston sleeve (2) is provided with an axial positioning structure on the outer wall of the piston body (1), and the axial positioning structure is installed on one or more than one first convex strip (7).

2. The air spring piston of claim 1, wherein: The axial positioning structure comprises a first arc-shaped convex strip (8) and a second arc-shaped convex strip (9) provided on the inner wall of the piston body (1), and a third arc-shaped convex strip (10) and a fourth arc-shaped convex strip (11) provided on the piston sleeve (2). The first arc-shaped convex strip (8) and the second arc-shaped convex strip (9) are located in the same circular arc, and a long groove (12) parallel to the axis of the piston body (1) is arranged between the first arc-shaped convex strip (8) and the second arc-shaped convex strip (9). After the piston sleeve (2) is sleeved on the piston body (1), the first convex strip (7) between the third arc-shaped convex strip (10) and the fourth arc-shaped convex strip (11) is embedded in the long groove (12), and the bottom of the third arc-shaped convex strip (10) abuts against the top surface of the first arc-shaped convex strip (8), and the bottom surface of the fourth arc-shaped convex strip (11) abuts against the top surface of the second arc-shaped convex strip (9).

3. The air spring piston of claim 2, wherein: The outer wall of the piston body (1) is provided with an outer wall of one end of the piston sleeve (2), and a plurality of second annular convex strips (13) are arranged at intervals.

4. The air spring piston of claim 3, wherein: The first arc-shaped convex strip (8) and the second arc-shaped convex strip (9) are located on the side wall of the second annular convex strip (13) at the bottom.

5. The air spring piston of claim 2, wherein: The end port of the piston sleeve (2) connected with the shock absorber is radially inwardly contracted, and the side wall of the outermost second annular convex strip (13) at the end is wrapped.

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