CN208417377U

CN208417377U - A kind of vehicle suspension gas spring

Info

Publication number: CN208417377U
Application number: CN201820941236.9U
Authority: CN
Inventors: 杨德君
Original assignee: Sichuan Site Vehicle Chassis Technology Co Ltd
Current assignee: Sichuan Site Vehicle Chassis Technology Co Ltd
Priority date: 2018-06-19
Filing date: 2018-06-19
Publication date: 2019-01-22
Anticipated expiration: 2028-06-19

Abstract

The utility model discloses a kind of vehicle suspension gas springs, including cylinder barrel, piston rod, capsule, damping valve module and lower connector, the piston rod is arranged in cylinder barrel, the first grease chamber, the second grease chamber and third grease chamber are disposed between the piston rod and cylinder barrel from top to bottom, the damping valve module is fixed between the second grease chamber and third grease chamber；The piston rod is hollow structure, and the capsule and lower connector are separately fixed at the both ends of piston rod, and the inside of capsule is communicated with the first grease chamber, and gas chamber is formed between capsule and lower connector, and the aerating mouth communicated with gas chamber is provided on the connector.The utility model can maintain that vehicle clearance is constant and spring offset frequency is constant in the even variation of 2 times or more on a large scale of vehicle dead load, and ride comfort that no matter unloaded and heavy-duty vehicle can be consistent and handling.

Description

Vehicle suspension gas spring

Technical Field

The utility model relates to an automotive suspension system field especially relates to a vehicle suspension gas spring.

Background

The automobile suspension system is a connecting structure system among a vehicle body, a vehicle frame and wheels, and the connecting structure system comprises a shock absorber, a suspension spring, an anti-tilting rod, a suspension secondary beam, a lower control arm, a longitudinal rod, a steering knuckle arm, a rubber bushing, a connecting rod and the like. When the automobile runs on a road surface, the automobile is subjected to vibration and impact due to the change of the ground, and part of the force of the impact is absorbed by the tire, but most of the force is absorbed by a suspension device between the tire and the automobile body.

In an automobile suspension system, a hydro-pneumatic spring is a suspension elastic damping element with excellent performance, is a core part of an hydro-pneumatic suspension, has damping characteristics and nonlinear stiffness characteristics, takes inert nitrogen as an elastic element, realizes vibration reduction by utilizing the flow resistance of oil, and realizes more accurate motion and force transmission by utilizing the incompressibility of the oil. The hydro-pneumatic spring has the variable stiffness characteristic, so that a vehicle provided with the hydro-pneumatic suspension can obtain lower natural vibration frequency, the labor condition of a driver is improved, the average vehicle speed is improved, and the hydro-pneumatic spring can also realize the adjustment of the vehicle body height.

The prior art with Chinese patent publication No. CN104047987A discloses a novel oil-gas spring in 9.17.2014.A first semispherical chamber is arranged in an inner cavity of an upper flying ring fixing device, a rubber oil-gas diaphragm is arranged at the upper opening of a working cylinder barrel, the first semispherical chamber and the rubber oil-gas diaphragm form a sealed high-pressure air chamber filled with high-pressure air, a sealed rodless cavity is formed by the rubber oil-gas diaphragm, the inner wall of the working cylinder barrel and a piston positioned below the rubber oil-gas diaphragm, an annular cavity is formed by the piston, the outer wall of a piston rod, the inner wall of the working cylinder barrel and the lower wall, and an air bag and a damping valve component are arranged; the side wall of the damping valve component is provided with four second trapezoidal through holes which are uniformly distributed along the radial direction, and the side wall of the piston rod is provided with four first trapezoidal through holes which are uniformly distributed along the radial direction and are positioned at the same radial position with the four second trapezoidal through holes. The working principle of the patent is as follows: when the static load of the vehicle changes, the outward thrust of the piston rod is changed by filling and discharging oil into and from the oil chamber, so that the aim of maintaining the height of the chassis unchanged is fulfilled. However, the oil has large flow resistance in the oil pipe and is limited by the drift diameter of the valve, so that the lifting speed of the vehicle chassis is low. In addition, the hydro-pneumatic spring is filled with oil to extrude the air chamber to reduce the volume of the air chamber, so that the bearing capacity of the hydro-pneumatic spring is improved by increasing air pressure and oil pressure. Therefore, when the hydro-pneumatic spring is used for a large-load commercial truck suspension, under the condition that the vehicle load change value is more than 2 times of the mass of the truck body, the offset frequency of the hydro-pneumatic spring is greatly increased, and the shock of the truck body bearing roadblocks even exceeds that of a steel plate spring.

In addition, the existing commercial passenger car suspension also commonly uses a rubber air spring, but the working pressure of the rubber air spring is lower, generally about 0.6MPa, the rubber air spring is limited by the radial size of a leather bag, the tonnage capable of bearing the vehicle load generally does not exceed 3.5 tons, and the defect of narrow application range exists. Accordingly, when the vehicle load changes greatly, the air pressure in the air bag changes, the outer diameter of the air bag changes, and the pressure bearing area of the piston changes along with the change, so that although the chassis height can be kept unchanged by charging and discharging the air pressure in the air bag during load change, because the rigidity change and the load mass are not in a linear relation, the smaller the load, the higher the offset frequency, the smaller the load, the smaller the offset frequency, and the unstable suspension offset frequency still exists.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned problem that exists among the prior art, provide a vehicle suspension gas spring, the utility model discloses can be on a large scale at the vehicle dead load and maintain that automobile body terrain clearance is unchangeable and spring bias frequency is unchangeable even when the change more than 2 times, and no matter no load and heavy load vehicle can both keep unanimous ride comfort and nature controlled.

In order to achieve the above object, the utility model adopts the following technical scheme:

a vehicle suspension gas spring comprises a cylinder, a piston rod, a capsule, a damping valve assembly and a lower connecting piece, wherein the piston rod is arranged in the cylinder, a first oil chamber, a second oil chamber and a third oil chamber are sequentially arranged between the piston rod and the cylinder from top to bottom, and the damping valve assembly is fixedly arranged between the second oil chamber and the third oil chamber; the piston rod is of a hollow structure, the capsule and the lower connecting piece are respectively fixed at two ends of the piston rod, the interior of the capsule is communicated with the first oil chamber, an air chamber is formed between the capsule and the lower connecting piece, and an air filling port communicated with the air chamber is arranged on the connecting piece.

The axial leads of the capsule and the piston rod are all on the same straight line.

The capsule comprises an opening end, an annular cuff is arranged on the opening end, a step is arranged on the piston rod, and the annular cuff is fixed on the step through a clamping ring and a screw.

The damping valve assembly is characterized in that a ring platform and a stretching limiting ring are fixedly arranged between the cylinder barrel and the piston rod, the first oil chamber, the second oil chamber and the third oil chamber are formed by separating the ring platform and the stretching limiting ring, and the damping valve assembly is fixedly arranged on the stretching limiting ring.

The ring platform is fixedly arranged on the inner wall of the cylinder barrel, and the inner diameter of the ring platform is matched with the outer diameter of the piston rod; the stretching limiting ring is fixedly arranged on the piston rod, and the outer diameter of the stretching limiting ring is matched with the inner diameter of the cylinder barrel.

An upper supporting ring is fixedly arranged between the ring platform and the piston rod.

The cylinder barrel comprises a closed end and an open end, an upper connecting piece is fixedly arranged at the closed end, an end cover is fixedly arranged at the open end, and the piston rod penetrates through the end cover to extend into the cylinder barrel.

The end cover is fixedly provided with stretching limiting rubber matched with the stretching limiting ring, and a lower supporting ring and a sealing element are fixedly arranged between the end cover and the piston rod.

The lower connecting piece comprises a cover plate with the outer diameter larger than that of the piston rod, an annular stretching section used for stretching into the piston rod is integrally formed on one surface of the cover plate, and a connecting section is integrally formed on the other surface of the cover plate.

And the cover plate is provided with compression limiting rubber matched with the end cover.

And a sealing element is arranged between the annular stretching-in section and the piston rod.

Adopt the utility model has the advantages of:

1. the utility model discloses a vehicle suspension gas spring includes the cylinder, the piston rod, capsule and lower connecting piece, first grease chamber has been formed through above-mentioned structure, the second grease chamber, third grease chamber and air chamber, and through first grease chamber, the second grease chamber, the cooperation of third grease chamber and air chamber, make the fluid total amount in the grease chamber invariable, and when the in-service use, the pressure through changing the air chamber and do not change the load-carrying capacity that the air chamber volume can the quick change vehicle, can the quick change vehicle body terrain clearance through changing the air chamber volume. Therefore, when the static load of the vehicle changes, the suspension frequency deviation can be kept stable, the height of the vehicle body above the ground and the spring frequency deviation can be kept unchanged when the static load of the vehicle changes in a large range or even more than 2 times, and the no-load and heavy-load vehicles can keep consistent smoothness and controllability. In addition, the damping valve assembly can provide bidirectional damping for oil flowing between the second oil chamber and the third oil chamber, and vibration of a vehicle body can be attenuated.

2. The utility model provides a capsule and the axial lead of piston rod all arrange capsule and piston rod with one heart on same straight line, make full use of the inner space of piston rod, can be in the limited high space of automotive suspension with the stroke design of spring bigger, make vehicle chassis have better trafficability characteristic. In addition, in the actual use process, the deformation of the capsule along with the inlet and outlet of the piston rod into and out of the inner cylinder barrel is radial deformation, when the length of the capsule is designed to be long enough, the radial expansion and contraction rate of the capsule are small, and the service life of the capsule can be ensured to be long enough.

3. The utility model discloses the annular cuff of well capsule passes through snap ring and fix with screw on the step, and this structure had both been favorable to making and the installation is fixed, is favorable to the annular cuff of the sealed capsule of interference again to reach the fluid of keeping apart the grease chamber reliably and the gaseous purpose of air chamber.

4. The utility model discloses a setting up ring platform and tensile spacing ring between cylinder and piston rod, can enough separate the grease chamber effectively, can play the stable supporting role to the piston rod again.

5. The utility model discloses a setting is favorable to gas spring to be connected with other parts fast at the last connecting piece of cylinder blind end.

6. The utility model discloses a tensile spacing rubber piece and compression spacing rubber piece can prevent the end cover and tensile spacing ring and end cover and the rigid collision between the connecting piece down.

7. The utility model provides a lower connecting piece includes that the external diameter is greater than the apron of piston rod external diameter, and the one side integrated into one piece of apron has the annular that is used for stretching into the piston rod to stretch into the section, and another side integrated into one piece has the linkage segment, and this structure had been favorable to connecting piece and the firm of piston rod to be connected down, is favorable to gas spring to be connected with other parts fast again.

8. The utility model has compact structure, the working pressure of the air chamber is up to 10MPa, the spring of 16 tons can be loaded, and the outer diameter is not more than 230 mm; the device is particularly suitable for heavy transport vehicles such as wharfs, mines and the like, and can also be used for commercial passenger cars, trucks and the like with low requirements.

9. The utility model discloses simple structure easily makes, and the maintenance cost is low, long-lived.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The labels in the figure are: 1. the cylinder barrel, 2, the ring platform, 3, the piston rod, 4, the capsule, 5, tensile spacing ring, 6, tensile spacing rubber, 7, go up the supporting ring, 8, compression spacing rubber, 9, lower connecting piece, 10, the gas filling port, 11, the under bracing ring, 12, the apron, 13, the end cover, 14, the air chamber, 15, the third grease chamber, 16, damping valve subassembly, 17, the second grease chamber, 18, the first grease chamber, 19, go up the connecting piece, 20, annular cuff, 21, the snap ring, 22, the screw, 23, the annular stretches into the section, 24, the linkage segment.

Detailed Description

A vehicle suspension gas spring comprises a cylinder 1, a piston rod 3, a capsule 4, a damping valve assembly 16 and a lower connecting piece 9, wherein the piston rod 3 is arranged in the cylinder 1, the upper end of the piston rod 3 is positioned in the cylinder 1, the lower end of the piston rod is positioned outside the cylinder 1, a first oil chamber 18, a second oil chamber 17 and a third oil chamber 15 are sequentially arranged between the piston rod 3 and the cylinder 1 from top to bottom, the damping valve assembly 16 is fixedly arranged between the second oil chamber 17 and the third oil chamber 15, and the second oil chamber 17 is communicated with the third oil chamber 15 through the damping valve assembly 16; the piston rod 3 is of a hollow structure, the capsule 4 and the lower connecting piece 9 are respectively fixed at two ends of the piston rod 3, the interior of the capsule 4 is communicated with the first oil chamber 18, an air chamber 14 is formed between the capsule 4 and the lower connecting piece 9, and an air filling port 10 communicated with the air chamber 14 is arranged on the connecting piece. Wherein,

in the utility model discloses, the axial lead of capsule 4 and piston rod 3 all is on same straight line, and capsule 4 arranges with piston rod 3 is concentric promptly. Specifically, the capsule 4 is preferably a cylindrical structure, and comprises an open end, and an annular cuff 20 is arranged on the open end; correspondingly, the piston rod 3 is provided with a step which is matched with the annular cuff 20, and the annular cuff 20 is fixed on the step through a snap ring 21 and a screw 22 during installation.

In the utility model, a ring platform 2 and a stretching limit ring 5 are fixedly arranged between the cylinder barrel 1 and the piston rod 3, the ring platform 2 is welded and fixed on the inner wall of the cylinder barrel 1 or integrally formed on the inner wall of the cylinder barrel 1, and the inner diameter of the ring platform 2 is matched with the outer diameter of the piston rod 3; the stretching limit ring 5 is welded and fixed or integrally formed on the piston rod 3, and the outer diameter of the stretching limit ring 5 is matched with the inner diameter of the cylinder barrel 1; the first oil chamber 18, the second oil chamber 17 and the third oil chamber 15 are formed by separating the ring platform 2 and the stretching limit ring 5, and the damping valve assembly 16 is fixedly arranged on the stretching limit ring 5. Further, an upper supporting ring 7 is fixedly arranged between the ring platform 2 and the piston rod 3, specifically, a step hole is formed in the ring platform 2, and the upper supporting ring 7 is installed in the step hole.

In the utility model, the cylinder barrel 1 comprises a closed end and an open end, the closed end is fixedly provided with an upper connecting piece 19, and the gas spring is respectively and fixedly connected with the automobile suspension and the automobile body through the upper connecting piece 19 and a lower connecting piece 9; an end cover 13 is fixedly arranged at the opening end, and the piston rod 3 penetrates through the end cover 13 and extends into the cylinder barrel 1. Further, a lower support ring 11 and a sealing element are fixedly arranged between the end cover 13 and the piston rod 3; the end cover 13 is also fixedly provided with a stretching limiting rubber 6 which is used for matching with the stretching limiting ring 5 and is used for preventing the stretching limiting ring 5 from rigidly colliding with the end cover 13 when the piston rod 3 moves downwards.

The utility model discloses in, connecting piece 9 includes that the external diameter is greater than the apron 12 of 3 external diameters of piston rod down, and the one side integrated into one piece of apron 12 has the annular that is used for stretching into piston rod 3 to stretch into section 23, and another side integrated into one piece has linkage segment 24, and still be provided with on the apron 12 be used for with the spacing rubber 8 of end cover 13 complex compression for prevent apron 12 and end cover 13 rigid collision when piston rod 3 moves upwards. Of course, the annular projection 23 and the connecting portion 24 can also be welded to the cover plate 12. Further, the annular extending section 23 is fixed at the end of the piston rod 3 in a threaded manner, and a sealing member is arranged between the annular extending section 23 and the piston rod 3.

The utility model discloses a theory of operation does:

wheel hop during vehicle travel

1. When the wheel jumps up, the lower connecting piece 9 drives the piston rod 3 to move towards the inside (upwards) of the cylinder barrel 1, the oil in the first oil chamber 18 forces the capsule 4 to expand, the volume of the air chamber 14 is reduced, the gas pressure is increased, and the elasticity of the gas spring is increased.

2. When the wheel jumps down, the lower connecting piece 9 drives the piston rod 3 to move towards the outside (downwards) of the cylinder barrel 1, the oil in the first oil chamber 18 forces the capsule 4 to contract, the volume of the air chamber 14 is increased, the gas pressure is reduced, and the elasticity of the gas spring is reduced.

In the above process, when the wheel jumps up, that is, the lower connecting piece 9 drives the piston rod 3 to move (upward) into the cylinder 1, the oil in the second oil chamber 17 enters the third oil chamber 15 through the damping valve assembly 16, and the oil generates the gas spring compression damping force when flowing through the damping valve assembly 16. When the wheel jumps down, i.e. the lower connecting piece 9 drives the piston rod 3 to move out of the cylinder 1 (downwards), the oil in the third oil chamber 15 enters the second oil chamber 17 through the damping valve assembly 16, and the oil generates a gas spring tensile damping force when flowing through the damping valve assembly 16.

Second, the lifting of the car body when the load is not changed

1. And (3) lifting the vehicle body: the air chamber 14 is filled with air through the air filling port 10, the volume of the air chamber 14 is increased, the capsule 4 contracts and extrudes oil in the first oil chamber 18 and pushes the piston rod 3 to move towards the outside of the cylinder barrel 1, and when the automobile body rises to a set value, the air filling port 10 stops filling air

2. And (3) reducing the vehicle body: the air chamber 14 is exhausted outwards through the air charging port 10, the volume of the air chamber 14 is reduced, the capsule 4 expands, the oil pressure of the first oil chamber 18 is reduced, the piston rod 3 moves towards the cylinder barrel 1 under the action of load, and when the automobile body is lowered to a set value, the air charging port 10 stops exhausting.

Third, vehicle static load variation

1. When the static load is increased, the height of the vehicle body is reduced, at the moment, the air chamber 14 is filled with air through the air filling port 10, the pressure of the air chamber 14 is increased, the piston rod 3 is forced to move outwards of the cylinder barrel 1 through the capsule 4 and the first oil chamber 18, and when the vehicle body returns to the set height, the air filling port 10 stops filling air.

2. When the static load is reduced, the height of the vehicle body is increased, the air is exhausted through the air charging port 10 at the moment, the pressure of the air chamber 14 is reduced, the elastic force of the gas spring is reduced through the capsule 4 and the first oil chamber 18, so that the sprung load gravity is balanced, and when the vehicle body returns to the set height, the air charging port 10 stops discharging air.

Since the air chamber 14 is inflated or deflated through the inflation port 10 to increase or decrease the pressure of the air chamber 14 to maintain the height of the vehicle body constant when the load changes, the volume of the air chamber 14 is not changed, the gas spring stiffness is only in direct proportion to the load mass, and the spring bias frequency is in inverse proportion to the sprung mass, so the spring bias frequency is not changed due to the load change. Finally, the vehicle body ground clearance and the spring bias frequency can be kept unchanged when the static load of the vehicle is changed in a large range or even more than 2 times, and the vehicle can keep consistent smoothness and controllability no matter whether the vehicle is unloaded or heavily loaded.

The embodiments described herein are merely preferred embodiments for implementing the functions and capabilities of the present invention, and obvious changes to the structure made by those skilled in the art can be made without departing from the essential function of the present invention, and the protection scope of the present invention is covered by the claims.

Claims

1. A vehicle suspension gas spring characterized by: the damping oil cylinder comprises a cylinder barrel (1), a piston rod (3), a capsule (4), a damping valve assembly (16) and a lower connecting piece (9), wherein the piston rod (3) is arranged in the cylinder barrel (1), a first oil chamber (18), a second oil chamber (17) and a third oil chamber (15) are sequentially arranged between the piston rod (3) and the cylinder barrel (1) from top to bottom, and the damping valve assembly (16) is fixedly arranged between the second oil chamber (17) and the third oil chamber (15); the piston rod (3) is of a hollow structure, the capsule (4) and the lower connecting piece (9) are respectively fixed at two ends of the piston rod (3), the interior of the capsule (4) is communicated with the first oil chamber (18), an air chamber (14) is formed between the capsule (4) and the lower connecting piece (9), and an air charging port (10) communicated with the air chamber (14) is arranged on the connecting piece.

2. A vehicle suspension gas spring as claimed in claim 1, wherein: the axial leads of the capsule (4) and the piston rod (3) are all on the same straight line.

3. A vehicle suspension gas spring as claimed in claim 1 or 2, wherein: the capsule (4) comprises an opening end, an annular cuff (20) is arranged on the opening end, a step is arranged on the piston rod (3), and the annular cuff (20) is fixed on the step through a clamping ring (21) and a screw (22).

4. A vehicle suspension gas spring as claimed in claim 1 or 2, wherein: fixed being provided with ring platform (2) and tensile spacing ring (5) between cylinder (1) and piston rod (3), first grease chamber (18), second grease chamber (17) and third grease chamber (15) are separated by ring platform (2) and tensile spacing ring (5) and are formed, damping valve subassembly (16) are fixed to be set up on tensile spacing ring (5).

5. A vehicle suspension gas spring as claimed in claim 4, wherein: the ring platform (2) is fixedly arranged on the inner wall of the cylinder barrel (1), and the inner diameter of the ring platform (2) is matched with the outer diameter of the piston rod (3); the stretching limiting ring (5) is fixedly arranged on the piston rod (3), and the outer diameter of the stretching limiting ring (5) is matched with the inner diameter of the cylinder barrel (1).

6. A vehicle suspension gas spring as claimed in claim 5, wherein: an upper supporting ring (7) is fixedly arranged between the ring platform (2) and the piston rod (3).

7. A vehicle suspension gas spring as claimed in claim 1, wherein: the cylinder barrel (1) comprises a closed end and an open end, an upper connecting piece (19) is fixedly arranged at the closed end, an end cover (13) is fixedly arranged at the open end, and the piston rod (3) penetrates through the end cover (13) and extends into the cylinder barrel (1).

8. A vehicle suspension gas spring as claimed in claim 7, wherein: the end cover (13) is fixedly provided with stretching limiting rubber (6) matched with the stretching limiting ring (5), and a lower supporting ring (11) and a sealing element are fixedly arranged between the end cover (13) and the piston rod (3).

9. A vehicle suspension gas spring as claimed in any one of claims 1, 2, 7 or 8, wherein: the lower connecting piece (9) comprises a cover plate (12) with the outer diameter larger than that of the piston rod (3), an annular extending section (23) used for extending into the piston rod (3) is integrally formed on one surface of the cover plate (12), and a connecting section (24) is integrally formed on the other surface of the cover plate.

10. A vehicle suspension gas spring as claimed in claim 9, wherein: and the cover plate (12) is provided with compression limiting rubber (8) matched with the end cover (13).