Two-stage sleeve type air spring

Abstract

The utility model discloses a two-stage sleeve type air spring, which relates to the field of air springs and comprises an outer cylinder barrel, a two-stage cylinder barrel and a piston rod, a first piston is slidably arranged in the outer cylinder barrel, the near end of the two-stage cylinder barrel is connected with the first piston, and the far end of the two-stage cylinder barrel extends out of the outer cylinder barrel; a second piston is slidably arranged in the second-stage cylinder barrel, the near end of the piston rod is connected with the second piston, and the far end of the piston rod extends out of the second-stage cylinder barrel; a first guide sleeve matched with the second-stage cylinder barrel is arranged on the inner side wall of the far end of the outer cylinder barrel. A second guide sleeve matched with the piston rod is arranged on the inner side wall of the far end of the second-stage cylinder barrel. The first guide sleeve and the second guide sleeve are each provided with a sealing guide structure.

Description

Technical Field

[0001] The utility model relates to the field of air springs, in particular to a two-stage sleeve-type air spring. Background Art

[0002] The existing combination of oil cylinder and two-stage pressure accumulator has defects such as affecting chassis layout, inconvenient assembly, and low assembly efficiency. In order to solve the above problems, the Chinese patent document "An integrated two-stage pressure hydraulic air spring" (patent number: 202121141232.0) discloses an air spring suitable for oil-gas suspension, which adopts an integrated design of accumulator and hydraulic cylinder without affecting its two-stage pressure characteristics.

[0003] However, the above structure lacks a sealing guide structure, which affects its sealing guide performance. Utility Model Content

[0004] In view of the defects existing in the prior art, the purpose of the utility model is to provide a two-stage sleeve air spring to improve the sealing and guiding performance.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is: a two-stage sleeve-type air spring, comprising an outer cylinder, a secondary cylinder and a piston rod, a first piston is slidably arranged in the outer cylinder, the proximal end of the secondary cylinder is connected to the first piston, and the distal end of the secondary cylinder extends from the outer cylinder; a second piston is slidably arranged in the secondary cylinder, the proximal end of the piston rod is connected to the second piston, and the distal end of the piston rod extends from the secondary cylinder; a first guide sleeve adapted to the secondary cylinder is arranged on the distal inner side wall of the outer cylinder; a second guide sleeve adapted to the piston rod is arranged on the distal inner side wall of the secondary cylinder; the first guide sleeve and the second guide sleeve are both provided with a sealing guide structure.

[0006] A further improvement is that the sealing guide structure includes a dust ring, a piston rod seal, a guide ring, a buffer ring and an O-ring.

[0007] A further improvement is that the dustproof ring is a DKBI metal skeleton dustproof ring.

[0008] A further improvement is that the piston rod seal is an IDI piston rod seal.

[0009] A further improvement is that the buffer ring is an HBY buffer ring.

[0010] A further improvement is that a buffer pad matched with the first piston is provided at the proximal end of the first guide sleeve.

[0011] A further improvement is that the outer side wall of the first piston and the outer side wall of the second piston are both provided with guide rings.

[0012] A further improvement is that: the proximal end of the outer cylinder and the distal end of the piston rod are both provided with welding parts, and a radial spherical bearing is provided at the center of the welding parts.

[0013] A further improvement is that it also includes a protective sleeve, which is corrugated, and one end of the protective sleeve is connected to the outer wall of the outer cylinder through a clamp, and the other end of the protective sleeve is connected to the distal end of the piston rod through a fixing plate.

[0014] A further improvement is that a straight joint and an internal thread plug are provided at the proximal end of the outer cylinder.

[0015] The beneficial effects of the utility model are:

[0016] 1. In the present invention, the inner side wall at the distal end of the outer cylinder is provided with a first guide sleeve adapted to the secondary cylinder; the inner side wall at the distal end of the secondary cylinder is provided with a second guide sleeve adapted to the piston rod; both the first guide sleeve and the second guide sleeve are provided with a sealing guide structure. Specifically, the sealing guide structure includes a dust ring, a piston rod seal, a guide ring, a buffer ring and an O-ring. Through the cooperation of the sealing guide elements, the sealing guide performance is improved.

[0017] 2. In the present invention, guide rings are provided on the outer side walls of the first piston and the second piston, which further improves the guiding performance.

[0018] 3. In the utility model, a protective sleeve is designed, and the protective sleeve is corrugated. One end of the protective sleeve is connected to the outer wall of the outer cylinder through a clamp, and the other end of the protective sleeve is connected to the distal end of the piston rod through a fixing plate, which further improves the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a two-stage sleeve-type air spring in an embodiment of the utility model;

[0020] Figure 2 It is a side view of a two-stage sleeve-type air spring in an embodiment of the utility model;

[0021] Figure 3 It is a cross-sectional view of a two-stage sleeve-type air spring in an embodiment of the utility model;

[0022] Figure 4 It is an enlarged schematic diagram of the first guide sleeve and the second guide sleeve in the embodiment of the utility model;

[0023] Figure 5 It is an enlarged schematic diagram of the first piston and the second piston part in the embodiment of the utility model.

[0024] Reference numerals:

[0025] 1-outer cylinder; 11-first guide sleeve; 12-straight joint; 13-internal thread plug;

[0026] 2-secondary cylinder; 21-first piston; 22-second guide sleeve;

[0027] 3-piston rod; 31-second piston;

[0028] 4-welded parts; 41-radial spherical plain bearing;

[0029] 5-protective sleeve; 51-clamp; 52-fixing plate;

[0030] 6-sealing guide structure; 61-dustproof ring; 62-piston rod seal; 63-guide ring; 64-buffer ring; 65-O-ring; 66-buffer pad. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below. The embodiments are shown in the accompanying drawings, wherein the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions.

[0032] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" and "a number" is two or more, unless otherwise clearly and specifically defined.

[0034] The following is a further description of the specific implementation of the utility model in conjunction with the drawings of the specification, so that the technical solution and its beneficial effects of the utility model are clearer and more explicit. The following description of the embodiments with reference to the drawings is exemplary and intended to explain the utility model, but cannot be understood as limiting the utility model.

[0035] See also Figure 1 to Figure 3As shown, the embodiment of the utility model provides a two-stage sleeve air spring, including an outer cylinder 1, a secondary cylinder 2 and a piston rod 3. A first piston 21 is slidably arranged in the outer cylinder 1, the proximal end of the secondary cylinder 2 is connected to the first piston 21, and the distal end of the secondary cylinder 2 extends from the outer cylinder 1; a second piston 31 is slidably arranged in the secondary cylinder 2, the proximal end of the piston rod 3 is connected to the second piston 31, and the distal end of the piston rod 3 extends from the secondary cylinder 2; a first guide sleeve 11 adapted to the secondary cylinder 2 is arranged on the distal inner side wall of the outer cylinder 1; a second guide sleeve 22 adapted to the piston rod 3 is arranged on the distal inner side wall of the secondary cylinder 2; both the first guide sleeve 11 and the second guide sleeve 22 are provided with a sealing guide structure 6. Specifically, a straight-through joint 12 and an internal thread plug 13 are arranged at the proximal end of the outer cylinder 1.

[0036] See also Figure 4 As shown, the sealing guide structure 6 includes a dust ring 61, a piston rod seal 62, a guide ring 63, a buffer ring 64 and an O-ring 65. Specifically, the dust ring 61 is a DKBI metal skeleton dust ring. The piston rod seal 62 is an IDI piston rod seal. The buffer ring 64 is an HBY buffer ring. Preferably, the proximal end of the first guide sleeve 11 is provided with a buffer pad 66 adapted to the first piston 21.

[0037] See also Figure 5 As shown, the outer wall of the first piston 21 and the outer wall of the second piston 31 are both provided with a guide ring 63 .

[0038] See also Figure 1 to Figure 3 As shown, the proximal end of the outer cylinder 1 and the distal end of the piston rod 3 are both provided with a welded part 4, and a radial spherical bearing 41 is provided at the center of the welded part 4.

[0039] See also Figure 1 to Figure 3 As shown, the two-stage sleeve air spring also includes a protective sleeve 5, which is corrugated, and one end of the protective sleeve 5 is connected to the outer wall of the outer cylinder 1 through a clamp 51, and the other end of the protective sleeve 5 is connected to the distal end of the piston rod 3 through a fixing plate 52.

[0040] In the description of the specification, the description with reference to the terms "one embodiment", "preferably", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model, and the schematic expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0041] Through the description of the above structure and principle, technicians in the relevant technical field should understand that the present invention is not limited to the above-mentioned specific implementation methods. Improvements and substitutions based on the present invention using the known technology in the field all fall within the protection scope of the present invention and should be defined by the claims.

Claims

1. A two-stage sleeve air spring, comprising an outer cylinder (1), a secondary cylinder (2) and a piston rod (3), characterized in that: A first piston (21) is slidably arranged in the outer cylinder (1), the proximal end of the secondary cylinder (2) is connected to the first piston (21), and the distal end of the secondary cylinder (2) extends from the outer cylinder (1); a second piston (31) is slidably arranged in the secondary cylinder (2), the proximal end of the piston rod (3) is connected to the second piston (31), and the distal end of the piston rod (3) extends from the secondary cylinder (2); a first guide sleeve (11) is arranged on the distal inner side wall of the outer cylinder (1) and is compatible with the secondary cylinder (2); a second guide sleeve (22) is arranged on the distal inner side wall of the secondary cylinder (2) and is compatible with the piston rod (3); the first guide sleeve (11) and the second guide sleeve (22) are both provided with a sealing guide structure (6).

2. The two-stage sleeve air spring according to claim 1, characterized in that: The sealing guide structure (6) comprises a dust ring (61), a piston rod seal (62), a guide ring (63), a buffer ring (64) and an O-ring (65).

3. The two-stage sleeve air spring according to claim 2, characterized in that: The dustproof ring (61) is a DKBI metal skeleton dustproof ring.

4. The two-stage sleeve air spring according to claim 2, characterized in that: The piston rod seal (62) is an IDI piston rod seal.

5. The two-stage sleeve air spring according to claim 2, characterized in that: The buffer ring (64) is a HBY buffer ring.

6. The two-stage sleeve air spring according to claim 2, characterized in that: A buffer pad (66) adapted to the first piston (21) is arranged at the proximal end of the first guide sleeve (11).

7. The two-stage sleeve air spring according to claim 1, characterized in that: The outer side wall of the first piston (21) and the outer side wall of the second piston (31) are both provided with a guide ring (63).

8. The two-stage sleeve air spring according to claim 1, characterized in that: The proximal end of the outer cylinder (1) and the distal end of the piston rod (3) are both provided with a welded part (4), and a radial spherical bearing (41) is provided at the center of the welded part (4).

9. The two-stage sleeve air spring according to claim 1, characterized in that: It also comprises a protective sleeve (5) which is corrugated, one end of which is connected to the outer wall of the outer cylinder (1) via a clamp (51), and the other end of which is connected to the distal end of the piston rod (3) via a fixing plate (52).

10. The two-stage sleeve air spring according to claim 1, characterized in that: The proximal end of the outer cylinder (1) is provided with a straight joint (12) and an internal thread plug (13).

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