CN216200103U

CN216200103U - Autonomous protection air spring

Info

Publication number: CN216200103U
Application number: CN202122652176.3U
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: 2022-04-05
Anticipated expiration: 2031-10-29

Abstract

The utility model discloses an autonomous protective air spring, and belongs to the technical field of air springs. The air spring is provided with a cylindrical air bag made of rubber, a limiting mechanism for limiting the highest stroke position is arranged in the air chamber, the upper end of the limiting mechanism is connected to the upper cover plate for packaging, and the lower end of the limiting mechanism is connected to the base for threaded connection; the limiting mechanism is mainly obtained by vulcanizing at least one layer of reinforcing wire layer and rubber; the reinforcing silk threads in one layer are composed of at least two reinforcing silk threads with different strengths, and the reinforcing silk threads are alternately and respectively provided with a second reinforcing silk thread at the adjacent position of the first reinforcing silk thread on the circumference of the limiting cylinder. When the air bag is in a bounce state, the limiting mechanism is pulled up, and the limiting mechanism is stretched to a certain length to play a limiting role, so that the air bag is prevented from being excessively pulled up.

Description

Autonomous protection air spring

Technical Field

The utility model belongs to the technical field of air springs, and particularly relates to an autonomous protective air spring.

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. In order to deal with the damage to the air spring caused by abnormal application caused by field emergency and improve the capacity of the air spring for dealing with faults, limiting devices are arranged at the highest position and the lowest position of the travel of the air spring, and a certain distance space is reserved.

1. Lowest limit:

the minimum height in the compressed state is always specified to be slightly higher than the height at which the airbag is compressed (the lowest height at which the airbag can be depressed after deflation). If the bladder is left in the above-described deflated condition for a long period of time, damage may result, and therefore a downward stop is required to prevent this. Two methods are generally used for arranging the lower limit of the air spring, one method is outer lower limit, a simple steel block can be placed around the air spring, and the limit height is slightly higher than the minimum height of the high horse air spring. The other is that under the condition that the external limit can not be used in the working environment of the air spring, an internal cushion block can be arranged in the air spring to be used as the minimum stroke limit of the air spring.

2. The highest limit:

air spring is being close its longest distance position, also can set up its length stop device, and the purpose is in order to prevent that air spring from can not damaging because excessively drawing when a glance of its length goes to certain position, and air spring belongs to the product that metal and rubber combination collocation formed after all, if surpass air spring's length limit, at first, air spring rubber gasbag partial tensile strength is not high, can cause serious influence to air spring's long-term use, has shortened air spring's life greatly. Secondly, the rubber air bag of the air spring and the end cover of the air spring are designed in a curled edge mode, when the air spring is pulled, if the pulling force is too large, the rubber air bag is easily torn at the joint of the rubber air bag and the end cover due to stress concentration, and the air spring is directly damaged. There are many methods for setting the upper limit of the air spring, and the common means includes chain, cable, metal contact limit, etc. in the air suspension system of a bus, a wire rope reverse limit device is generally installed.

With the development of technology, an air spring limited by sensing equipment is currently available, for example, chinese patent No. cn202020421723.x discloses an air spring device, including: the device comprises an upper cover plate, a lower column body, an air bag and a distance measuring sensor, wherein the lower column body and the upper cover plate are arranged at intervals up and down; the upper end of the air bag is connected with the upper cover plate, the lower end of the air bag is connected with the lower column body to form a closed cavity, and the space between the upper cover plate and the lower column body is adjusted by inflating and deflating the closed cavity; the distance measuring sensor is arranged on one side, close to the sealed cavity, of the upper cover plate and used for measuring the distance between the upper cover plate and the lower column body, and the traditional displacement sensor is replaced by the distance measuring sensor.

The mechanical limiting structure or the photoelectric sensing structure effectively limits the highest and the lowest positions of the stroke of the air spring, so that the capacity of the air spring for coping with faults is improved, but the capacity needs to be further improved.

Disclosure of Invention

1. Problems to be solved

Aiming at the technical problem, the utility model provides an autonomous protective air spring which can effectively prevent the air spring bag skin from being broken when the air spring bag is at the highest stroke position.

2. Technical scheme

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

the utility model relates to an autonomous protective air spring, which is provided with a cylindrical air bag made of rubber, 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 for limiting the lowest stroke position; a limiting mechanism for limiting the highest stroke position is arranged in the air chamber, the upper end of the limiting mechanism is connected to the upper cover plate for packaging, and the lower end of the limiting mechanism is connected to the base for threaded connection; the limiting mechanism is mainly obtained by vulcanizing at least one layer of reinforced wire layer and rubber; the reinforcing silk threads in one layer are composed of at least two reinforcing silk threads with different strengths, and the reinforcing silk threads are alternately and respectively provided with a second reinforcing silk thread at the adjacent position of the first reinforcing silk thread on the circumference of the limiting mechanism.

In one possible embodiment of the utility model, the reinforcing thread layers are inclined at an angle of 30 ° to 60 ° with respect to the circumferential helix of the limiting means, and the reinforcing threads are arranged parallel to one another in one layer.

In one possible embodiment of the utility model, the effective thickness of the limiting mechanism is 1.5-3 mm.

3. Advantageous effects

Compared with the prior art, the utility model has the beneficial effects that:

(1) according to the autonomous protection air spring, when the air bag is in a bounce state, the limiting mechanism is pulled up, and the limiting mechanism is stretched to a certain length to play a limiting role, so that the air bag is prevented from being excessively pulled up to be damaged;

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

Drawings

FIG. 1 is a schematic structural diagram of an autonomous protective air spring according to the present invention;

FIG. 2 is an enlarged view of A of the autonomous protective air spring of the present invention;

FIG. 3 is a side view of FIG. 2;

fig. 4 is a cross-sectional view taken along line B-B of fig. 1.

Description of reference numerals:

11. an air bag;

12. a base;

13. an upper cover plate;

14. an air chamber;

15. an elastic limiting block;

16. a limiting mechanism; 161. reinforcing the silk thread layer; 162. rubber; 163. a first reinforcing yarn; 164. a second reinforcing yarn; 165. a flow guide hole;

17. and (7) closing the plate.

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

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

The autonomous protective air spring of the embodiment is applied to an air suspension, and can be used on automobiles, trucks and the like.

As shown in fig. 1 to 4, the air spring has a cylindrical air bag 11 made of rubber, the air bag 11 connects a base 12 and an upper cover plate 13 to form a sealed air chamber 14, the air chamber 14 is connected to an air source, the outer surface of the air bag 11 rolls 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 is longitudinally guided to be restrained by an elastic stopper 15, the elastic stopper 15 is disposed in the air chamber 14 and connected to the base 12 for the lowest stroke position restraint; a limiting mechanism 16 for limiting the highest stroke position is arranged in the air chamber 14, the upper end of the limiting mechanism 16 is connected to the upper cover plate 13 for packaging, the lower end of the limiting mechanism 16 is connected to the base 12 for threaded connection, and specifically, a sealing plate 17 is adopted to press the lower end edge folding part of the limiting mechanism 16, and then the limiting mechanism is fixed by bolts; the limiting mechanism 16 is mainly obtained by vulcanizing at least one layer of reinforcing wire layer 161 and rubber 162, preferably, at most two layers of reinforcing wire layers 161 can reduce the weight of the air spring, and the number of layers should not be too many to achieve high flexibility.

The vulcanization process of the limiting mechanism 16 is not particularly limited, and the existing vulcanization process, such as the vulcanization process of the rubber 162 tire, can be referred to, and the effective thickness of the limiting mechanism 16 is 1.5-3.0mm, and the specific thicknesses are 1.5mm, 1.8mm, 2.0mm, 2.4mm, 2.5mm, 2.8mm and 3.0 mm.

The limiting mechanism 16 is arranged in the air chamber 14 of the air bag 11, the height of the limiting mechanism 16 is smaller than that of the air bag 11, so that effective space utilization is realized, meanwhile, when the air bag 11 is pulled up, the limiting mechanism 16 is pulled up along with the air bag, and when the limiting mechanism 16 reaches the highest stroke position, the air bag 11 can be limited to be continuously pulled up to play a role in downward adjustment and limiting of the air bag 11; when gasbag 11 was followed spacing compression, stop gear 16 also retracted simultaneously, and stop gear 16 is able to bear or endure tensile strength and confirm according to vehicle suspension weight and factor of safety, if: the suspension weight is 1000 kilograms, the safety factor is 1.5 times, the lever ratio of the air bag 11 is 70 percent, and the calculation is as follows: the strength M of the limiting mechanism 16 is more than or equal to 1000X 0.7X 1.5/2 and 525 kg.

As can be seen from fig. 2, the reinforcing thread layer 161 is spirally inclined at an angle of 30 ° to 60 ° with respect to the circumference of the stop mechanism 16, specifically, at an angle of 30 °, 45 °, 50 °, or 60 °, and the reinforcing threads are arranged in parallel with each other in one layer, so that the tensile load-bearing capacity and the lateral force of the stop mechanism 16 can be influenced by the angle of the reinforcing threads within a predetermined contour of the stop mechanism 16 in consideration of the high-frequency operation of the stop mechanism 16 in the airbag 11.

In the embodiment, the reinforcing silk thread is a nylon 66 dipped cord, and the strength of a single cord can reach 15-25 Kg; the reinforcing thread has a diameter of 0.5-1.2mm, specifically selected from 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm and 1.2 mm.

Furthermore, the vulcanized rubber adopted by the limiting mechanism 16 is vulcanized rubber prepared from hydrogenated nitrile rubber, chloroprene rubber, N660 carbon black and other materials, and the vulcanized rubber has a high elongation at break (550%) or more.

Compared with the existing method of limiting by using a chain, a cable, a steel wire rope, metal contact and the like, the limiting mechanism 16 has a better use effect, it needs to be described that the structure of the air bag 11 is not changed, the limiting mechanism 16 is placed in the air bag 11, and the air chamber 14 is correspondingly divided into three parts, as shown in fig. 1, namely a first air chamber, a second air chamber and a third air chamber, wherein the first air chamber is surrounded by the limiting mechanism 16, and the second air chamber and the third air chamber are respectively arranged on two sides of the first air chamber. Tests show that due to the isolation of the limiting mechanism 16 and the high-frequency vibration, the air flow inside the whole air chamber 14 is locally disturbed, so that the fluctuation of the air spring is caused, and the stability of the air suspension is further influenced. In this embodiment, a plurality of flow guide holes 165 are formed in the wall of the limiting mechanism 16, at least a part of the reinforcing threads in one layer has different strength from the rest, and the reinforcing threads are alternately provided with a reinforcing thread 164 with a second strength at a position adjacent to the reinforcing thread 163 with the first strength on the circumference of the limiting mechanism 16, so that the punctiform damage (burst of rubber 162) in a certain area under the existence of working pressure can be effectively prevented, and the rigidity of the limiting mechanism 16 is improved and the vibration is reduced; the deflector hole 165 may effectively communicate the first air chamber, the second air chamber, and the third air chamber, while the provision of the deflector hole 165 may dissipate a portion of the vibrational energy.

Specifically, the first reinforcing threads 163 and the second reinforcing threads 164 are made of materials having different strengths. The first strength reinforcing filaments 163 are high strength aramid filaments; aramid filaments, which have both high strength and high elastic modulus and outstanding dimensional stability, can be copolymers consisting essentially of terephthalic acid and p-phenylenediamine; the second-strength reinforcing silk 164 is a lower-strength nylon 66 dipped cord, and the strength of a single cord can reach 15-25 Kg.

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 autonomous protective air spring is provided with a cylindrical air bag (11) made of rubber, wherein the air bag (11) is connected with a base (12) and an upper cover plate (13) to form a sealed air chamber (14), and is characterized in that a limiting mechanism (16) for limiting the highest stroke position is arranged in the air chamber (14), the upper end of the limiting mechanism (16) is connected to the upper cover plate (13) for packaging, and the lower end of the limiting mechanism is connected to the base (12) in a threaded connection manner; the limiting mechanism (16) is mainly obtained by vulcanizing at least one layer of reinforced wire layer (161) and rubber (162); the reinforcing threads in one layer are formed by at least two reinforcing threads with different strengths, and a second reinforcing thread (164) is alternately arranged on the circumference of the limiting mechanism (16) and is respectively arranged at the adjacent position of the first reinforcing thread (163).

2. The autonomous protective air spring according to claim 1, characterized in that the reinforcing wire layer (161) is spirally inclined at an angle of 30 ° to 60 ° with respect to the circumference of the stopper mechanism (16), and the reinforcing wires are arranged in parallel with each other in one layer.

3. Autonomous protective air spring according to claim 2, characterized in that the effective thickness of the limit mechanism (16) is 1.5-3 mm.