Air spring with same frequency in transverse direction and vertical direction

Abstract

The invention relates to a transverse and vertical same-frequency air spring which comprises an upper cover plate, a lower cover plate, an air bag and a limiting device. Wherein the upper and lower parts of the air bag are hermetically connected with the upper cover plate and the lower cover plate respectively to form a closed cavity; an upper limiting mechanism and a lower limiting mechanism are arranged in the closed cavity; the lower limiting mechanism is connected with the lower cover plate and provided with a limiting cavity, and a first vertical limiting piece is arranged in the limiting cavity. The upper limiting mechanism comprises a limiting rod and a second vertical limiting piece; the limiting rod is fixedly connected with the upper cover plate and sleeved with an auxiliary pin sleeve. The second vertical limiting piece is arranged in the limiting cavity and is connected with the limiting rod; when the air spring is stretched and / or compressed, the second vertical limiting piece makes vertical contact with the first vertical limiting piece, and vertical limiting is achieved. Vertical and transverse limiting is achieved through cooperation of the upper limiting mechanism and the lower limiting mechanism, meanwhile, transverse rigidity is provided for the air spring by additionally arranging the auxiliary pin bush, and the problems that the transverse rigidity of the air spring is low, and the vertical frequency and the transverse frequency are different are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air springs, and in particular relates to a transverse and vertical air spring with the same frequency. Background Art

[0002] An air spring is a device that is filled with compressed air in a sealed container and uses the compressibility of the gas to achieve its elastic effect. It is widely used in the field of modern vibration reduction and isolation.

[0003] Air springs provide vibration reduction in both the vertical and lateral directions. The closer the ratio of an air spring's lateral stiffness to its vertical stiffness (i.e., the lateral-to-vertical stiffness ratio) is to 1, the more consistent the air spring's lateral and vertical vibration frequencies become. This results in a more balanced dynamic response in multiple directions, enabling consistent vibration reduction and support performance in different directions. However, in existing technologies, the lateral-to-vertical stiffness ratio of an air spring is typically less than 0.8, and only some high-pressure, high-load air springs have a lateral-to-vertical stiffness ratio greater than 2. This significantly limits the synergistic dynamic response of the air spring in both the lateral and vertical directions.

[0004] In addition, the existing air spring design generally only considers vertical compression limiting. Although this design ensures to a certain extent that the air spring can play an emergency support role in the event of overload and airbag failure, in actual application, the air spring may face complex situations such as overload, overfilling, and large lateral and longitudinal displacements. The lack of lateral limiting of the existing air spring makes it difficult to ensure the stability of the air spring under extreme working conditions. Summary of the Invention

[0005] The purpose of the present invention is to solve one of the above technical problems and provide an air spring with the same frequency in the horizontal and vertical directions.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A horizontal and vertical same-frequency air spring, comprising: an upper cover plate, a lower cover plate, an air bag and a limit device;

[0008] The upper and lower sub-ports of the airbag are sealed with the upper cover plate and the lower cover plate respectively, forming a closed cavity between the upper and lower cover plates;

[0009] The limiting device is arranged in the closed cavity and includes a lower limiting mechanism and an upper limiting mechanism;

[0010] The lower limiting mechanism is fixedly connected to the lower cover plate, and together with the lower cover plate, forms a limiting cavity with an upward opening, and a first vertical limiting member is provided in the limiting cavity;

[0011] The upper limiting mechanism includes a limiting rod and a second vertical limiting member;

[0012] One end of the limiting rod is fixedly connected to the upper cover plate, and the other end extends into the limiting cavity; an auxiliary pin sleeve is sleeved on the limiting rod, and the outer wall of the auxiliary pin sleeve is slidably connected to the inner wall of the limiting cavity through a rolling bearing.

[0013] The second vertical limiting member is arranged in the limiting cavity and is fixedly connected to the limiting rod; when the air spring stretches and / or compresses, the second vertical limiting member is vertically in contact with the first vertical limiting member to achieve vertical limiting.

[0014] In some embodiments of the present invention, a clamp is arranged below the auxiliary pin sleeve, and the clamp is fixedly connected to the limiting rod to perform vertical limiting on the auxiliary pin sleeve.

[0015] In some embodiments of the present invention, a lateral limiting member is arranged at the end of the limiting rod connected to the upper cover plate; the lateral limiting member is fixedly connected to the upper cover plate, and a convex portion is formed on the surface of the upper cover plate around the lateral limiting member to perform lateral limiting on the lateral limiting member.

[0016] In some embodiments of the present invention, a sealing member is arranged between the lateral limiting member and the upper cover plate.

[0017] In some embodiments of the present invention, the included angle between the contact surface between the upper cover plate and the airbag and the horizontal plane, and the included angle between the contact surface between the lower cover plate and the airbag and the horizontal plane are the airbag contact angles, and the airbag contact angle is 30°.

[0018] In some embodiments of the present invention, the maximum value of the airbag cord angle is 30°.

[0019] In some embodiments of the present invention, a through hole is formed in the lower limiting mechanism, and both ends of the through hole communicate with the limiting cavity and the closed cavity outside the limiting cavity respectively.

[0020] In some embodiments of the present invention, both the upper cover plate and the lower cover plate are provided with airbag accommodation grooves;

[0021] The upper mouth and the lower mouth of the airbag are respectively arranged in the airbag accommodation grooves of the upper cover plate and the lower cover plate;

[0022] An inverted buckle boss is arranged on one side of the notch of the airbag accommodation groove to prevent the airbag from slipping out of the airbag accommodation groove.

[0023] In some embodiments of the present invention, the first vertical limiting member is arranged circumferentially along the groove wall of the limiting cavity and has an opening formed in the middle, dividing the limiting cavity into an upper cavity and a lower cavity communicating through the opening;

[0024] The auxiliary pin sleeve is arranged in the upper cavity; the second vertical limiting member is arranged in the lower cavity, and the diameter of the second vertical limiting member is larger than the diameter of the opening.

[0025] In some embodiments of the present invention, an air inlet channel is provided on the upper cover plate, and two ends of the air inlet channel are connected to the closed cavity and the external atmosphere respectively.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present invention realizes both vertical and lateral limiting through the cooperation of the upper limiting mechanism and the lower limiting mechanism, so that the air spring can adapt to complex situations such as overload, overcharge, and large lateral and longitudinal displacement, thereby improving the stability of the air spring under extreme working conditions;

[0028] 2. The present invention sets an auxiliary pin sleeve between the limit rod and the lower limiting mechanism. The outer wall of the auxiliary pin sleeve is fitted with the lower limiting mechanism through a rolling bearing to achieve vertical free sliding. The inner wall and the limit rod are fitted with interference fit to provide lateral stiffness for the air spring, solving the problem of low lateral stiffness and different vertical and lateral frequencies of the air spring.

[0029] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 This is a schematic diagram of the structure of a horizontal and vertical air spring with the same frequency;

[0032] Figure 2 for Figure 1 The enlarged structural diagram of the middle part I;

[0033] Figure 3 for Figure 1 The enlarged structural diagram of the middle part II;

[0034] Figure 4 Schematic diagram of the structure of the upper limit mechanism;

[0035] Figure 5 It is a top view of an air spring with the same frequency in the horizontal and vertical directions;

[0036] Wherein, the accompanying drawings are marked as follows:

[0037] 1. Upper cover; 11. Raised portion; 12. Air intake passage;

[0038] 2. Lower cover;

[0039] 3. Airbag;

[0040] 4. Lower limiting mechanism; 41. First vertical limiting member; 42. Through hole;

[0041] 5. Upper limit mechanism; 51. Limit rod; 52. Second vertical limit member; 53. Auxiliary pin sleeve; 54. Horizontal limit member;

[0042] 6. Ball bearings;

[0043] 7. Seals;

[0044] 8. Undercut boss. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is described and illustrated below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely used to explain this application and are not intended to limit this application. Based on the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without making any creative efforts are within the scope of protection of this application.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0048] The technical solution of the present invention is described in detail below in conjunction with specific embodiments and the accompanying drawings.

[0049] As attached Figure 1 -Attached Figure 5 As shown, in an illustrative embodiment of a transverse and vertical uniform frequency air spring of the present invention, the air spring includes an upper cover plate 1, a lower cover plate 2, an airbag 3 and a limiting device.

[0050] Among them, the upper and lower mouths of the airbag 3 are respectively sealed and connected to the upper cover plate 1 and the lower cover plate 2, forming a sealed cavity between the upper cover plate 1 and the lower cover plate 2. When the air spring is in use, air is filled into the sealed cavity, and vibration reduction and isolation are achieved through the compression of air. Specifically, the connection method between the upper cover plate 1 and the airbag 3 includes but is not limited to self-sealing and bolt fastening. The connection method between the lower cover plate 2 and the airbag 3 is self-sealing.

[0051] The limiting device is arranged in the sealed cavity, including a lower limiting mechanism 4 and an upper limiting mechanism 5. After the relative displacement between the upper limiting mechanism 5 and the lower limiting mechanism 4, contact is achieved to realize rigid contact, and thus rigid limiting is realized.

[0052] Among them, the lower limiting mechanism 4 is a clamp-shaped structure, which is fixedly connected to the lower cover plate 2 by screws, and together with the lower cover plate 2 forms a limiting cavity with an upward opening. A first vertical limiting member 41 is arranged in the limiting cavity.

[0053] The upper limiting mechanism 5 includes a limiting rod 51, a second vertical limiting member 52 and an auxiliary pin sleeve 53.

[0054] Among them, one end of the limiting rod 51 is fixedly connected to the upper cover plate 1 by bolts, and the other end extends into the limiting cavity.

[0055] The auxiliary pin sleeve 53 is sleeved on the limiting rod 51. The inner wall of the auxiliary pin sleeve 53 and the limiting rod 51 are assembled by means of cold assembly interference fit. The outer wall of the auxiliary pin sleeve 53 is slidably connected to the inner wall of the limiting cavity through a rolling bearing.

[0056] In practical applications, by adjusting the rubber layer thickness, hardness and structural design of the auxiliary pin sleeve 53, the adjustment of different stiffness performances can be realized.

[0057] The second vertical limiting member 52 is arranged in the limiting cavity and is fixedly connected to the end of the limiting rod 51.

[0058] When the air spring is stretched, the second vertical limiting member 52 is vertically in contact with the first vertical limiting member 41 to realize vertical stretching limit. When the air spring is compressed, the second vertical limiting member 52 is vertically in contact with the bottom wall of the limiting cavity, that is, the upper surface of the lower cover plate 2, to realize vertical compression limit.

[0059] When the lateral and longitudinal displacements of the air spring exceed the limit, the auxiliary pin sleeve 53 is laterally compressed, and the first vertical limiting member 41 and the second vertical limiting member 52 are laterally in contact to realize lateral limit.

[0060] In the above-described exemplary embodiments, vertical and lateral limits for stretching and compression are achieved through the cooperation of the upper limit mechanism 5 and the lower limit mechanism 4. An auxiliary pin sleeve 53 is added between the upper limit mechanism 5 and the lower limit mechanism 4. The outer wall of the auxiliary pin sleeve 53 is in contact with the lower limit mechanism 4 through a rolling bearing to achieve free vertical sliding, and the inner wall is in interference fit with the limit rod 51, providing lateral stiffness for the air spring and solving the problems of low lateral stiffness and different vertical and lateral frequencies of the air spring.

[0061] In some embodiments of the present invention, a clamp is provided below the auxiliary pin sleeve 53. The clamp is fixedly connected to the limit rod 51 to perform vertical limit on the auxiliary pin sleeve 53 and fix the position of the auxiliary pin sleeve 53.

[0062] In some embodiments of the present invention, a lateral limit member 54 is provided at the end of the limit rod 51 connected to the upper cover plate 1. The limit rod 51 is fixedly connected to the upper cover plate 1 through the lateral limit member 54, and a convex portion 11 is formed on the surface of the upper cover plate 1 around the lateral limit member 54 to perform lateral limit on the lateral limit member 54. Specifically, 8 bolts are used for fastening connection between the lateral limit member 54 and the upper cover plate 1.

[0063] In some embodiments of the present invention, a seal 7 is provided between the lateral limit member 54 and the upper cover plate 1. The seal 7 is an O-ring or a gasket, which is used to ensure that the air spring meets the predetermined airtightness requirements. Specifically, the predetermined airtightness requirement is that the pressure drop within 24 hours is less than 0.5% of the rated internal pressure.

[0064] In some embodiments of the present invention, the limit rod 51, the lateral limit member 54 and the vertical limit member are integrally designed, and the vertical cross-section of the limit integral formed by the limit rod 51, the lateral limit member 54 and the vertical limit member is in the shape of an I.

[0065] In some embodiments of the present invention, the limit rod 51 is formed by splicing an upper rod body and a lower rod body, and the upper rod body and the lower rod body are connected by screw fastening. Among them, the upper rod body and the lateral limit member 54 are of an integral structure, and the lower rod body and the vertical limit member are of an integral structure.

[0066] In some embodiments of the present invention, the angle between the contact surface between the upper cover plate 1 and the airbag 3 and the horizontal plane, and the angle between the contact surface between the lower cover plate 2 and the airbag 3 and the horizontal plane are the contact angles of the airbag 3. In this embodiment, the contact angle of the airbag 3 is 30°.

[0067] In some embodiments of the present invention, the maximum value of the cord angle of the airbag 3 is 30°.

[0068] It should be noted that when the contact angle between the upper and lower cover plates 2 and the airbag 3 changes, as the contact angle increases, the restraint of the upper and lower cover plates 2 on the outer diameter of the airbag 3 increases, and the lateral stiffness can be effectively increased on the premise of having less influence on the vertical stiffness; on the contrary, as the contact angle decreases, the restraint of the upper and lower cover plates 2 on the outer diameter of the airbag 3 decreases, and the lateral stiffness decreases accordingly.

[0069] The change in the cord angle of the airbag 3 determines the inflation state of the airbag 3. After the cord angle of the airbag 3 increases, the expansion of the outer diameter of the airbag 3 decreases, the lateral stiffness increases, and the vertical stiffness decreases; on the contrary, when the cord angle of the airbag 3 decreases, the expansion of the outer diameter of the airbag 3 increases, the lateral stiffness decreases, and the vertical stiffness increases.

[0070] In the present invention, the lateral stiffness of the air spring is provided by the auxiliary pin sleeve 53. When the contact angle between the upper and lower cover plates 2 and the airbag 3 and the cord angle are insufficient to meet the predetermined lateral-to-vertical stiffness ratio, the difference between the lateral stiffness and the vertical stiffness of the air spring can be adjusted to meet the requirement of lateral-to-vertical co-frequency.

[0071] In the present invention, by increasing the contact angle between the upper and lower cover plates 2 and the airbag 3 to 30°, the angle between the outer contour of the airbag 3 and the upper and lower cover plates 2 is matched. By controlling the contact angle, the restraint of the upper and lower cover plates 2 on the airbag 3 is realized, and the lateral stiffness of the airbag 3 is increased.

[0072] Increasing the cord angle of the airbag 3 to 30° effectively increases the lateral stiffness. In some cases, the requirement of lateral-to-vertical co-frequency can be achieved without the internal auxiliary pin sleeve 53.

[0073] When the internal auxiliary pin sleeve 53 is added, the contact angle and the cord angle between the upper and lower cover plates 2 and the airbag 3 can be appropriately reduced. In practical applications, through finite element simulation calculation and orthogonal test methods, the set angles of the contact angle and the cord angle between the upper and lower cover plates 2 and the airbag 3 are determined, and the stiffness of different auxiliary pin sleeves 53 is matched to achieve the optimal design in terms of the processing, manufacturing, assembly, and service life of the air spring, and at the same time achieve the lateral-to-vertical co-frequency of the air spring.

[0074] In some embodiments of the present invention, at least one through hole 42 is formed in the lower limit mechanism 4. The two ends of the through hole 42 are respectively communicated with the limit cavity and the closed cavity outside the limit cavity to realize the gas flow between the cavities, ensure the internal volume of the air spring, and at the same time, the damping performance of the air spring can be designed by controlling the number and diameter of the through holes 42.

[0075] In some embodiments of the present invention, both the upper cover plate 1 and the lower cover plate 2 are provided with annular airbag accommodating grooves.

[0076] The light installation of the upper and lower mouths of the airbag 3 matches the shape of the accommodating groove, and is respectively arranged in the airbag accommodating grooves of the upper cover plate 1 and the lower cover plate 2, and is hermetically connected to the upper cover plate 1 and the lower cover plate 2.

[0077] On one side of the notch of the airbag 3 accommodation groove, there is an inverted buckle boss 8. The inverted buckle boss 8 of the airbag 3 accommodation groove on the upper cover plate 1 extends to the lower part of the upper sub-port connection part of the airbag 3, and the inverted buckle boss 8 of the airbag 3 accommodation groove on the lower cover plate 2 extends to the upper part of the lower sub-port connection part of the airbag 3, so as to ensure that the airbag 3 is connected in place with the upper cover plate 1 and the lower cover plate 2 when the airbag 3 is installed, and prevent the airbag 3 from being disengaged from the airbag 3 accommodation groove.

[0078] In some embodiments of the present invention, the first vertical limiting member 41 is arranged circumferentially along the groove wall of the limiting cavity and has an opening formed in the middle, dividing the limiting cavity into an upper cavity and a lower cavity communicating through the opening.

[0079] The auxiliary pin sleeve 53 is arranged in the upper cavity. The second vertical limiting member 52 is arranged in the lower cavity, and the diameter of the second vertical limiting member 52 is larger than the diameter of the opening.

[0080] In some embodiments of the present invention, an air inlet channel 12 is provided on the upper cover plate 1, and both ends of the air inlet channel 12 communicate with the sealed cavity and the external atmosphere respectively.

[0081] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and the key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: still modifications can be made to the specific embodiments of the present invention or equivalent replacements can be made to some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A horizontal and vertical co-frequency air spring, characterized in that, Comprising: an upper cover plate, a lower cover plate, an airbag and a limiting device; The upper mouth and the lower mouth of the airbag are hermetically connected to the upper cover plate and the lower cover plate respectively, and a sealed cavity is formed between the upper cover plate and the lower cover plate; The limiting device is arranged in the sealed cavity and comprises a lower limiting mechanism and an upper limiting mechanism; The lower limiting mechanism is fixedly connected to the lower cover plate and jointly forms a limiting cavity with an upward opening with the lower cover plate, and a first vertical limiting member is arranged in the limiting cavity; The upper limiting mechanism comprises a limiting rod and a second vertical limiting member; One end of the limiting rod is fixedly connected to the upper cover plate, and the other end extends into the limiting cavity; an auxiliary pin sleeve is sleeved on the limiting rod, and the outer wall of the auxiliary pin sleeve is slidably connected to the inner wall of the limiting cavity through a rolling bearing; The second vertical limiting member is arranged in the limiting cavity and is fixedly connected to the limiting rod; when the air spring stretches and / or compresses, the second vertical limiting member is vertically in contact with the first vertical limiting member to achieve vertical limiting.

2. The vertical and horizontal air spring with the same frequency according to claim 1, wherein A clamp is arranged below the auxiliary pin sleeve, and the clamp is fixedly connected to the limiting rod to perform vertical limiting on the auxiliary pin sleeve.

3. The transverse and vertical co-frequency air spring according to claim 1, characterized in that, A transverse limiting member is arranged at the end of the limiting rod connected to the upper cover plate; the transverse limiting member is fixedly connected to the upper cover plate, and a convex portion is formed on the surface of the upper cover plate around the transverse limiting member to perform transverse limiting on the transverse limiting member.

4. The cross-vertical same-frequency air spring according to claim 3, characterized in that, A sealing member is arranged between the transverse limiting member and the upper cover plate.

5. The vertical and horizontal co-frequency air spring according to claim 1, characterized in that The included angle between the contact surface between the upper cover plate and the airbag and the horizontal plane, and the included angle between the contact surface between the lower cover plate and the airbag and the horizontal plane are the airbag contact angles, and the airbag contact angle is 30°.

6. The vertical and horizontal co-frequency air spring according to claim 1 or 4, characterized in that, The maximum value of the airbag cord angle is 30°.

7. The lateral and vertical air spring with the same frequency according to claim 1, characterized in that A through hole is formed in the lower limiting mechanism, and the two ends of the through hole are respectively communicated with the limiting cavity and the sealed cavity outside the limiting cavity.

8. The vertical and horizontal air spring with the same frequency according to claim 1, characterized in that Both the upper cover plate and the lower cover plate are provided with airbag accommodation grooves; The upper mouth and the lower mouth of the airbag are respectively arranged in the airbag accommodation grooves of the upper cover plate and the lower cover plate; An inverted buckle boss is arranged on one side of the notch of the airbag accommodation groove to prevent the airbag from coming out of the airbag accommodation groove.

9. The vertical and horizontal co-frequency air spring according to claim 1, characterized in that The first vertical limiting member is arranged circumferentially along the groove wall of the limiting cavity and has an opening in the middle, dividing the limiting cavity into an upper cavity and a lower cavity communicated through the opening; The auxiliary pin sleeve is arranged in the upper cavity; the second vertical limiting member is arranged in the lower cavity, and the diameter of the second vertical limiting member is larger than the diameter of the opening.

10. The vertical and transverse air spring with the same frequency according to claim 1, characterized in that An air inlet channel is arranged on the upper cover plate, and the two ends of the air inlet channel are respectively communicated with the sealed cavity and the external atmosphere.

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