CN113844226A

CN113844226A - Air spring and air suspension with same

Info

Publication number: CN113844226A
Application number: CN202111271412.5A
Authority: CN
Inventors: 刘庆福; 肖斌
Original assignee: New Generation Automobile Chassis System Ma'anshan Co ltd
Current assignee: New Generation Automobile Chassis System Ma'anshan Co ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2021-12-28

Abstract

The invention discloses an air spring and an air suspension with the same, and belongs to the technical field of air springs. The air spring is provided with a cylindrical air bag made of an elastomer material, the air bag is connected with a base and an upper cover plate to form a sealed air chamber, under the condition that the volume of the air chamber changes between the level when the base retracts and the level when the base extends, the outer surface of the air bag slides and rolls on the base, the upper cover plate is longitudinally guided and limited by an elastic limiting block, and the elastic limiting block is arranged in the air chamber and connected to the base; the outer side of the air bag sliding on the base is provided with a plurality of annular bulges along the circumferential surface, and the bulges are provided with force application surfaces for applying force to the downward movement of the sand particles. The annular bulge is provided with a force application surface for applying force to the downward movement of the sand particles, so that the sand particles can be prevented from entering between the bag cover and the base and can be discharged through the relative movement between the bag cover and the base in the running process of the vehicle.

Description

Air spring and air suspension with same

Technical Field

The invention belongs to the technical field of air springs, and particularly relates to an air spring and an air suspension with the same.

Background

Along with the rapid development of advanced technologies such as automobile electronics, measurement and control technologies, material forming, machining and the like, the design and control technology of the air spring is mature day by day. In recent 5 years, the competition of middle and high-end cars is increasingly fierce, and the high-end cars (popular, Toyota, fast running and time-saving) and business cars which come into the market abroad increasingly apply the semi-active air suspension technology to the high-end cars, so that on one hand, the brand image is improved, the advanced technical advantages of enterprises are shown, the high-end market is occupied, on the other hand, the high-end cars carry the rich profits brought by the new technology, and the high-end cars are also attractive enough to host factories. In the early 19 th century, air spring products were applied to mechanical equipment. After nearly a hundred years, in the beginning of the 20 th century, the air spring was loaded onto a heavy truck in the U.S. percentage. To date, more than half of heavy-duty trucks in the world are loaded with air springs, more than 60% of trailers are equipped with air spring fields, and the share of air springs on engineering vehicles (such as cement mixer trucks and sanitation vehicles) and high-speed buses is increased year by year. The application of air spring products and technologies is increasing year by year. In 1957, the air spring is firstly applied to a passenger car to adjust the height of the car body in the Cadillac ratio, since the air spring product is concerned by high-end car brands, and host factories such as Benz, Ford and peck successively release car models loaded with the air spring.

The air spring comprises an air bag, a base, a piston, an upper cover plate, a sealing ring and the like. In the movement process, the rubber air bag is curled along the outer contour of the piston base, so that the elastic deformation of the air spring is obtained. For example, Chinese patent CN201811198273.6 discloses a novel sleeve type air spring with an external constraint aluminum cover, and the top end of the outer surface of a rubber air bag is provided with a pressure ring protection cover; for another example, chinese patent CN202010773569.7 discloses a composite air spring structure with a built-in coil spring, wherein the outer side of the upper port of the air bag is connected with the upper port of the dust cover; for another example, chinese patent CN201811198221.9 discloses a novel double-restraint suspension air spring, wherein an air bag protective cover is fastened on the outer wall of a rubber air bag, and a restraint assembly is arranged on the outer wall of the rubber air bag; the restraint assembly comprises a lower restraint ring, an upper restraint ring and an air bag protective cover. However, the above-mentioned dust-proof techniques have many problems, firstly, the whole space dust-proof cannot be effectively achieved, and due to the use characteristics of the air spring, the dust-proof sand cover placed on the upper part or the lower part of the air spring cannot effectively prevent the invasion of the dust and sand on the side surface of the air spring to the air spring; secondly, the sand and dust intruding between the air spring air bag and the base cannot be removed, and finally the air spring is damaged or the service life of the air spring is reduced.

Disclosure of Invention

1. Problems to be solved

Aiming at the technical problem, the invention provides the air spring which can discharge sand and dust in the using process and reduce the abrasion of the leather bag.

The invention also provides an air suspension with the air spring.

2. Technical scheme

In order to solve the problems, the technical scheme adopted by the invention is as follows:

the invention provides an air spring, which is provided with a cylindrical air bag made of an elastomer material, wherein the air bag is connected with a base and an upper cover plate to form a sealed air chamber, under the condition that the volume of the air chamber changes between the level when the base retracts and the level when the base extends, the outer surface of the air bag slides on the base, the upper cover plate is longitudinally guided and limited by an elastic limiting block, and the elastic limiting block is arranged in the air chamber and connected to the base; the outer side of the air bag sliding on the base is provided with a plurality of annular bulges along the circumferential surface, and the bulges are provided with force application surfaces for applying force to the downward movement of the sand dust particles.

In one possible embodiment of the invention, the projection is formed integrally with the airbag.

In one possible embodiment of the present invention, the protrusions are discontinuous, and adjacent protrusions are staggered.

In one possible embodiment of the present invention, the distance between the adjacent protrusions is 5-45 mm.

In a possible embodiment of the present invention, the cross section of the protrusion is a barb structure, the barb structure includes an arc surface and a right-angle plane, and the right-angle plane is a force application surface.

In one possible embodiment of the present invention, the effective height of the right-angle plane is 1-5mm, and the effective length of the arc surface is 5-30 mm.

In one possible embodiment of the present invention, the cross section of the protrusion is a triangular structure, the triangular structure includes an inclined plane and a right-angled plane, and the right-angled plane is a force application plane.

In one possible embodiment of the present invention, the effective height of the right-angle plane is 1-5mm, and the effective length of the inclined plane is 5-30 mm.

The invention also provides an air suspension, which comprises the air spring.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the air spring, the annular bulge is arranged at the contact part of the surface of the bag skin and the base, and the bulge is provided with the force application surface for applying force to downward movement of sand and dust particles, so that sand and dust can be prevented from entering between the bag skin and the base and can be discharged through the relative movement between the bag skin and the base in the running process of a vehicle;

(2) the air spring is simple in structure and easy to manufacture.

Drawings

FIG. 1 is a schematic view of an air spring of the present invention;

FIG. 2 is a cross-sectional view of an air spring of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a diagram illustrating the use of the air spring of the present invention;

FIG. 5 is another schematic structural view of an air spring of the present invention.

Description of reference numerals:

11. an air bag; 111. a capsule skin; 112. a protrusion; 113. a force application surface;

12. a base; 13. an upper cover plate; 14. an air chamber; 15. an elastic limiting block; 16. and (5) sand dust.

Detailed Description

Exemplary embodiments of the present invention are described in detail below. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is presented for purposes of illustration only and not limitation to describe the features and characteristics of the invention, to set forth the best mode of carrying out the invention, and to sufficiently enable one skilled in the art to practice the invention. Accordingly, the scope of the invention is to be limited only by the following claims.

The following detailed description and example embodiments of the invention are set forth.

The air spring is generally installed on an air suspension of a vehicle, in the actual use process, because a large amount of sand and dust exist on a road, the contact surface of the air bag 11 and the base 12 is in reciprocating contact and pulled away, some sand and dust can enter between the air bag 11 and the base 12 and even adhere to the contact surface, and long-time movement friction is caused, so that the bag skin 111 of the air bag 11 is easily abraded, and the air bag 11 is damaged.

As shown in fig. 1 to 5, the air spring of the present embodiment has a cylindrical air bag 11 made of an elastomer material, which may be rubber or the like, the air bag 11 connecting a base 12 and an upper cover plate 13 to form a sealed air chamber 14, the outer surface of the air bag 11 sliding on the base 12 in the case where the volume of the air chamber 14 varies between the level when the base 12 is retracted and the level when the base 12 is extended, the upper cover plate 13 being longitudinally guided by an elastic stopper 15, the elastic stopper 15 being disposed in the air chamber 14 and connected to the base 12; the outer bag skin 111 of the air bag 11 sliding on the base 12 is formed with a plurality of annular protrusions 112 along the circumferential surface, and the protrusions 112 have force-applying surfaces 113 for applying force to the downward movement of the sand 16 particles.

The inventor of the present invention, through long-term tests and analyses, and in combination with the use characteristics of the air spring, on the premise of not affecting the normal use of the air spring, as shown in fig. 2, gives a movement state of the air bag 11 and the base 12 when the air bag 11 of the air spring is compressed, and can see that the air bag 11 and the base 12 realize relative creeping, through analysis, if sand and dust entering or adhering to the base 12 are exposed, the annular protrusion 112 on the bag skin 111 has a force application surface 113 for applying force to downward movement of the sand 16 particles, when the air bag 11 is inflated and extended, the bag skin 111 and the base 12 are pulled apart, and the annular protrusion 112 on the bag skin 111 can apply force to the sand 16 particles, so as to discharge the sand 16, thereby effectively avoiding abrasion of the bag skin 111, and prolonging the service life of the bag.

As shown in fig. 1, the structure of the protrusion 112 in one form is wavy in front view, and in this embodiment, the protrusion 112 may be made by a process, such as combining a high wear-resistant and high resilience material of natural rubber and butadiene rubber with a leather bag base; in order to facilitate production and processing, the protrusion 112 and the bag skin 111 of the airbag 11 can be integrally formed by manufacturing a mold, so that the protrusion 112 is combined more firmly and is not easy to fall off.

In fig. 5, it can be seen that the protrusions 112 are discontinuous, and the adjacent protrusions 112 are staggered with each other, so that on one hand, the use of materials can be reduced, and on the other hand, due to the continuous friction between the capsule shell 111 and the base 12, heat can be generated, and through the discontinuous design, an airflow channel can be formed, so that the heat dissipation of the surface of the capsule shell 111 is enhanced, and meanwhile, deformation energy generated by the extrusion of the protrusions 112 and the base 12 is released through the discontinuous portions.

Further, the distance between the adjacent protrusions 112 in this embodiment is 5-45mm, which can be determined quantitatively or qualitatively in combination with the specific size of the air spring bag 11. In general, the distance between adjacent protrusions 112 is 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, or 45 mm.

Preferably, the cross section of the protrusion 112 is a barb structure, the barb structure includes an arc surface and a right-angle plane, and the right-angle plane is a force application surface 113. In fig. 2 and 3, for example, at the position of the air spring skin 111A, a barb structure (having a force application surface 113 for applying a force to downward movement of the dust 16 particles) is provided, which is opposite to the direction of the indirect contact creep of the skin 111 and the base 12, so that the air spring is caused by the relative movement or creep between the skin 111 and the base 12 during use, as shown in fig. 4, the arrow indicates the movement direction of the skin, so as to prevent the dust 16 from entering and discharge the dust 16 from the effective contact area between the skin 111 and the base 12, thereby achieving the effects of preventing dust and cleaning the contact surface. On the premise of fully considering the particle size of the dust, the effective height of the right-angle plane is 1-5mm, specifically 1, 2, 3, 4, 5mm, and the effective length of the arc surface is 5-30mm, specifically 5, 10, 15, 20, 25, 30 mm.

Through a large number of laboratory use cases, it is verified that the section of the protrusion 112 has a barb structure, so that the use effect is better. Compared with the traditional air bag, the service life of the air bag is prolonged by about 5-10%, and although the manufacturing process of the air bag becomes complicated, on one hand, the bulges on the outer surface of the air bag play a role of reinforcing ribs, so that the air bag can be well supported, and the strength of the air bag is enhanced; on the other hand, after the gasbag was inside to be full of gas, the gasbag external diameter increase and with the base parcel, there is the experiment to show, wave protruding can play the guide effect to a certain extent for the gasbag motion in-process can accurately reset and parcel live the base, can play the cushioning effect better.

In addition, the cross section of the protrusion 112 may also be a triangular structure, where the triangular structure includes an inclined plane and a right-angle plane, and the right-angle plane is the force application plane 113. The effective height of the right-angle plane is 1-5mm, specifically 1, 2, 3, 4, 5mm, and the effective length of the inclined plane is 5-30mm, specifically 5, 10, 15, 20, 25, 30 mm.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and improvements can be made without departing from the technical principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. An air spring having a cylindrical air chamber (11) made of an elastomeric material, said air chamber (11) connecting a base (12) and an upper cover plate (13) to form a sealed air chamber (14), the outer surface of said air chamber (11) sliding on said base (12) in the event of a change in the volume of the air chamber (14) between a level when the base (12) is retracted and a level when the base (12) is extended, said upper cover plate (13) being longitudinally guided by an elastic stopper (15), said elastic stopper (15) being placed inside the air chamber (14) and being connected to said base (12); the dust collector is characterized in that a plurality of annular bulges (112) are formed on the circumferential surface of an outer bag skin (111) of the air bag (11) which slides on the base (12), and the bulges (112) are provided with force application surfaces (113) which apply force to the downward movement of the sand dust (16).

2. Air spring according to claim 1, characterized in that the projection (112) is integrally formed with the air bag (11).

3. Air spring according to claim 2, characterized in that the projections (112) are intermittent, adjacent projections (112) being staggered with respect to each other.

4. Air spring according to claim 3, characterized in that the spacing between adjacent protrusions (112) is 5-45 mm.

5. Air spring according to claim 4, characterized in that the cross section of the protrusion (112) is a barb structure, and the barb structure comprises a circular arc surface and a right-angle plane, and the right-angle plane is a force application surface (113).

6. The air spring of claim 5, wherein the effective height of the right plane is 1-5mm and the effective length of the arc surface is 5-30 mm.

7. Air spring according to claim 1, characterized in that the cross section of the protrusion (112) is a triangular structure comprising an inclined surface and a right-angled plane, the right-angled plane being the force application surface (113).

8. The air spring of claim 7, wherein the effective height of the right plane is 1-5mm and the effective length of the ramp is 5-30 mm.

9. An air suspension comprising an air spring according to any one of claims 1 to 8.