Compact rigidity self-control type air spring

Abstract

A self-control device outer barrel is located in a piston air chamber, the upper end of the self-control device outer barrel is fixedly connected with a piston top plate, a self-control device inner barrel is coaxially sleeved with the self-control device outer barrel at intervals, and the lower section of the inner barrel is located in the outer barrel. The upper section upwards penetrates through the piston top plate and then extends into the air bag; the inner cylinder is provided with three rows of vent holes at different heights from top to bottom, and the upper row of vent holes of the inner cylinder are always located in the air bag; when a vehicle body is static, the inner cylinder middle row vent holes and the inner cylinder lower row vent holes are located in the piston air chamber. The lower section of the outer cylinder is provided with outer cylinder upper-row vent holes and outer cylinder lower-row vent holes; when the stroke of the suspension does not exceed the riding comfort of the automobile, the stroke of the suspension is improved, and the air bag, the piston air chamber and the additional air chamber work together to provide small rigidity, so that the automobile obtains good riding comfort; on the contrary, only the air bag works to provide larger rigidity, so that the automobile gives consideration to the automobile body posture stability and prevents the suspension limit from being impacted.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile, and relates to the suspension spring of automobile, specifically is the stiffness self -control type air spring for automobile suspension. BACKGROUND

[0002] Suspension is an important structure and function part of automobile, mainly when the automobile travels on bad road, the vibration transmitted to the vehicle body by the wheel is attenuated, so that the passenger obtains good ride comfort. In order to provide good vehicle body low frequency and high frequency vibration suppression effect simultaneously, the document with patent application number CN2024112169851 and the name of "stiffness gradually increasing type three mass secondary damping hierarchical control suspension and design and application" provides a kind of air spring as basic component, stiffness control valve is arranged between air bag and stiffness control chamber, and stiffness gradually increasing type spring driven by suspension travel. When the absolute value of suspension dynamic travel is less than or equal to a particular preset threshold, the stiffness control valve is connected with the air bag and the stiffness control chamber, and the stiffness gradually increasing type spring automatically provides small stiffness;When the absolute value of suspension dynamic travel is greater than or equal to a particular preset threshold, the stiffness control valve disconnects the air bag and the stiffness control chamber, and the stiffness gradually increasing type spring automatically provides large stiffness. The stiffness gradually increasing type spring cooperates with the damper of outputting large damping, and good vehicle body low frequency vibration suppression effect can be obtained, the stiffness gradually increasing type spring cooperates with the damper of outputting small damping and the wheel power vibration absorber, and good vehicle body high frequency vibration suppression effect can be obtained, the stiffness gradually increasing type spring automatically provides large stiffness when suspension is far away from equilibrium position, and automatically ensures the stability of vehicle body posture. However, the existing problems are that: the stiffness control valve is large in size, there are many parts, and is located outside the air bag, sealing is needed between valve body and valve core, and the installation space of suspension is also occupied. SUMMARY

[0003] The utility model discloses the purpose at solving the problems of above-mentioned prior art, provide a kind of compact stiffness self -control type air spring without occupying the installation space of suspension, few parts, and do not have to consider sealing.

[0004] In order to achieve the above object, the utility model discloses a compact rigidity self -control formula air spring adopts following technical scheme: including air bag, piston gas chamber and additional air chamber, air bag upper end with air bag top plate is connected with the car body, and air bag is located the upper of piston gas chamber, and the piston gas chamber is isolated with air bag between with piston top plate, and piston gas chamber lower extreme is equipped with the car wheel with piston bottom plate, and piston gas chamber is connected with additional air chamber through the air pipe, still include self -control device outer tube and self -control device inner tube, and self -control device outer tube is located in piston gas chamber and with upper end fixed connection piston top plate, and the lower end is suspended in piston gas chamber, and self -control device inner tube is in the coaxial heart of self -control device outer tube and can move up and down in self -control device outer tube along the axial direction, and the lower section of self -control device inner tube is located in self -control device outer tube, and the upper section is stretched in air bag after passing through piston top plate upwards, and with air bag top plate articulates, and the lower end of self -control device inner tube is sealed, and the three rows of vent holes are opened in different heights from top to bottom in self -control device inner tube, and the upper row of vent holes of the inner tube of the uppermost row is always located in air bag, and when the car body is stationary, the middle row of vent holes of the inner tube and the lower row of vent holes of the inner tube of the lowermost row are located in piston gas chamber, and the upper row of vent holes of self -control device outer tube and the lower row of vent holes of self -control device outer tube are opened on self -control device outer tube, and when the car body is stationary, the upper edge of the middle row of vent holes of the inner tube is aligned with the upper edge of the upper row of vent holes of self -control device outer tube, and the lower edge of the lower row of vent holes of the inner tube is aligned with the lower edge of the lower row of vent holes of self -control device outer tube.

[0005] Further, the middle row of vent holes of the inner tube and the lower row of vent holes of the inner tube are long strip shape, and the length direction of the long strip shape is the axial direction of the self -control device inner tube.

[0006] Further, under the condition of guaranteeing strength, the sum of the cross section area of all the same row of vent holes is better larger.

[0007] Further, the upper end of the self -control device inner tube is connected with the air bag top plate upwards by ball hinge.

[0008] The utility model has the beneficial effects after adopting the above technical scheme:

[0009] 1, The utility model discloses a compact stiffness self -control type air spring compared with the stiffness control valve of the stiffness gradually increasing type spring in the document of patent application no. CN2024112169851, mainly has the following difference: 1) double -barrel type stiffness self -control device is to adopt internal and external cylinder structure, instead of adopting outer valve body and inner rod body structure, so need not to connect the air pipe additionally, reduce parts.2) double -barrel type stiffness self -control device's internal and external cylinder is equipped with three rows and two rows air hole respectively, instead of being equipped with three holes a groove on the valve body of stiffness control valve, and being equipped with two grooves on the valve core of stiffness control valve, can obviously improve the ventilation efficiency.3) double -barrel type stiffness self -control device's internal and external cylinder need not like stiffness control valve to additionally set up spring return device between the valve body and the valve core, so the structure is simplified, and the volume is reduced;4) because double -barrel type stiffness self -control device is located in the inside of air spring, so need not like the valve body and the valve core setting in the outside to additionally set up sealing device, structure is simpler and more reliable, will not additionally occupy the suspension installation space.

[0010] 2, The utility model discloses a compact stiffness self -control type air spring when the suspension stroke is not more than the suspension stroke threshold value of the improvement of the automobile ride comfort, provides smaller stiffness together with the piston gas chamber and the additional gas chamber, makes the automobile obtain better ride comfort;On the contrary, when the suspension stroke exceeds the suspension stroke of the improvement of the automobile ride comfort, only provides larger stiffness by the air bag, makes the automobile give consideration to the body posture stability and avoids the suspension limiting being hit. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the structure schematic diagram of a compact stiffness self -control type air spring of the utility model;

[0012] In the drawing: 1. air bag;1-1. air bag top plate;2. self -control device outer cylinder;2-1. outer cylinder upper row hole;2-2. outer cylinder lower row hole;3. piston gas chamber;3-1. piston top plate;3-2. piston bottom plate;4. self -control device inner cylinder;4-1. inner cylinder upper row hole;4-2. inner cylinder middle row hole;4-3. inner cylinder lower row hole;5. additional gas chamber;6. ball hinge. DETAILED DESCRIPTION

[0013] Referring to Figure 1 , a compact stiffness self -control type air spring of the utility model includes air bag 1, piston gas chamber 3, additional gas chamber 5, double -barrel type stiffness self -control device and ball hinge 6. Among them, double -barrel type stiffness self -control device is composed of self -control device outer cylinder 2 and self -control device inner cylinder 4.

[0014] The air bag 1 is located above the piston chamber 3, the upper end of the air bag 1 is the air bag top plate 1-1, and the air bag top plate 1-1 is connected with the vehicle body. The piston chamber 3 is installed upward below the air bag 1, and the piston chamber 3 is isolated from the air bag 1 by a piston top plate 3-1, and the piston top plate 3-1 isolates the compressed air in the piston chamber 3 and the air bag 1. The lower end of the piston chamber 3 is a piston bottom plate 3-2, and the piston bottom plate 3-2 is installed downward on the vehicle wheel. The piston chamber 3 is externally connected with an additional air chamber 5 through an air pipe.

[0015] The double-cylinder type stiffness self-control device is arranged inside the air bag 1 and the piston chamber 3, wherein the self-control device outer cylinder 2 is entirely located in the piston chamber 3, the upper end of the self-control device outer cylinder 2 is fixedly connected upward on the piston top plate 3-1, and the lower end of the self-control device outer cylinder 2 is suspended in the piston chamber 3. A self-control device inner cylinder 4 is coaxially sleeved in the self-control device outer cylinder 2, the lower section of the self-control device inner cylinder 4 is located in the self-control device outer cylinder 2, and the self-control device inner cylinder 4 can move up and down in the self-control device outer cylinder 2 in the axial direction. The upper section of the self-control device inner cylinder 4 extends in the air bag 1 after passing through the piston top plate 3-1 upward. And the upper end of the self-control device inner cylinder 4 is hinged with the air bag top plate 1-1. The upper end of the self-control device inner cylinder 4 of the utility model is connected upward with the air bag top plate 1-1 by a spherical hinge 6. The lower end of the self-control device inner cylinder 4, that is, the bottom, needs to be sealed and can be extended below the self-control device outer cylinder 2.

[0016] Three rows of air holes are opened at different heights on the self-control device inner cylinder 4 from top to bottom, wherein the uppermost row is the inner cylinder upper row air hole 4-1, which is always located in the air bag 1. The middle row is the inner cylinder middle row air hole 4-2, and the lowermost row is the inner cylinder lower row air hole 4-3. When the vehicle body is stationary, the inner cylinder middle row air hole 4-2 and the inner cylinder lower row air hole 4-3 are located in the piston chamber 3. The shapes of the inner cylinder middle row air hole 4-2 and the inner cylinder lower row air hole 4-3 are long strips, and the length direction of the long strips is in the axial direction of the self-control device inner cylinder 4.

[0017] Two rows of air holes are opened in the lower section of the self-control device outer cylinder 2, which are the outer cylinder upper row air hole 2-1 and the outer cylinder lower row air hole 2-2. When the vehicle body is stationary, the upper edge of the inner cylinder middle row air hole 4-2 is aligned with the upper edge of the outer cylinder upper row air hole 2-1, and the lower edge of the inner cylinder lower row air hole 4-3 is aligned with the lower edge of the outer cylinder lower row air hole 2-2.

[0018] Under the condition of ensuring strength, the sum of the cross-sectional areas of all the same row of air holes on the self-control device outer cylinder 2 or the self-control device inner cylinder 4 is as large as possible to improve the air exchange efficiency.

[0019] When the vehicle body moves upward away from the wheel, the self-control device inner cylinder 4 is driven by the air bag top plate 1-1 and the ball hinge 6 to move upward relative to the self-control device outer cylinder 2 fixed on the piston top plate 3-1, when the lower edge of the inner cylinder middle vent hole 4-2 is not higher than the upper edge of the outer cylinder upper vent hole 2-1, the compressed air flows from the piston air chamber 3 to the air bag 1 through the outer cylinder upper vent hole 2-1, the inner cylinder middle vent hole 4-2, the inside of the self-control device inner cylinder 4 and the inner cylinder upper vent hole 4-1, and the air bag 1, the piston air chamber 3 and the additional air chamber 5 work together to provide smaller rigidity. When the lower edge of the inner cylinder middle vent hole 4-2 is higher than the upper edge of the outer cylinder upper vent hole 2-1, there is no compressed air flow between the self-control device outer cylinder 2 and the self-control device inner cylinder 4, so only the air bag 1 works to provide larger rigidity.

[0020] When the vehicle body moves downward to approach the wheel, the self-control device inner cylinder 4 is driven by the air bag top plate 1-1 and the ball hinge 6 to move downward relative to the self-control device outer cylinder 2 fixed on the piston top plate 3-1, when the upper edge of the inner cylinder lower vent hole 4-3 is not lower than the lower edge of the outer cylinder lower vent hole 2-2, the compressed air flows from the air bag 1 to the piston air chamber 3 through the inner cylinder upper vent hole 4-1, the inside of the self-control device inner cylinder 4, the inner cylinder lower vent hole 4-3 and the outer cylinder lower vent hole 2-2, at this time, the air bag 1, the piston air chamber 3 and the additional air chamber 5 work together to provide smaller rigidity. When the upper edge of the inner cylinder lower vent hole 4-3 is lower than the lower edge of the outer cylinder lower vent hole 2-2, there is no compressed air flow between the self-control device outer cylinder 2 and the self-control device inner cylinder 4, so only the air bag 1 works to provide larger rigidity.

[0021] The length of the inner cylinder middle vent hole 4-2 and the inner cylinder lower vent hole 4-3 is equal to the suspension travel threshold value for improving the comfort of automobile riding, and the distance between the upper edge of the inner cylinder middle vent hole 4-2 and the upper edge of the inner cylinder lower vent hole 4-3 is designed to be slightly larger than the suspension limiting travel.

[0022] Due to the flow of compressed air between the air bag 1 and the piston air chamber 3, the suspension travel is controlled without the need for additional sensors and controllers, and for this reason, the air spring is named as a rigidity self-control type air spring.

Claims

1. A compact stiffness-controlled air spring, comprising an air bladder (1), a piston chamber (3), and an auxiliary air chamber (5), wherein the upper end of the air bladder (1) is connected to the vehicle body via an air bladder top plate (1-1), the air bladder (1) is located above the piston chamber (3), the piston chamber (3) and the air bladder (1) are separated by the piston top plate (3-1), the lower end of the piston chamber (3) is mounted on the wheel via a piston bottom plate (3-2), and the piston chamber (3) is externally connected to the auxiliary air chamber (5) via an air pipe, characterized in that: It also includes an outer cylinder (2) of the automatic control device and an inner cylinder (4) of the automatic control device. The outer cylinder (2) of the automatic control device is located in the piston chamber (3) and its upper end is fixedly connected to the piston top plate (3-1), and its lower end is suspended in the piston chamber (3). The inner cylinder (4) of the automatic control device is coaxially fitted in the outer cylinder (2) of the automatic control device and the inner cylinder (4) of the automatic control device can move up and down in the outer cylinder (2) of the automatic control device along the axial direction. The lower section of the inner cylinder (4) of the automatic control device is located in the outer cylinder (2) of the automatic control device, and the upper section passes through the piston top plate (3-1) and extends into the air bag (1), and its upper end is hinged to the air bag top plate (1-1). The lower end of the inner cylinder (4) of the automatic control device is sealed. The inner cylinder (4) of the automatic control device has three rows of vent holes at different heights from top to bottom. The uppermost row of vent holes (4-1) is always located inside the airbag (1). When the vehicle body is stationary, the middle row of vent holes (4-2) and the lowermost row of vent holes (4-3) are located in the piston chamber (3). The outer cylinder (2) of the automatic control device has an upper vent hole (2-1) and a lower vent hole (2-2). When the vehicle body is stationary, the upper edge of the middle vent hole (4-2) of the inner cylinder is aligned with the upper edge of the upper vent hole (2-1) of the outer cylinder, and the lower edge of the lower vent hole (4-3) of the inner cylinder is aligned with the lower edge of the lower vent hole (2-2) of the outer cylinder.

2. The compact stiffness-controlled air spring according to claim 1, characterized in that: The vent holes (4-2) in the middle of the inner cylinder and the vent holes (4-3) in the lower part of the inner cylinder are elongated, and the length direction of the elongated shape is the axial direction of the inner cylinder (4) of the automatic control device.

3. A compact, self-stiffening air spring according to claim 1, characterized in that: Under the condition of ensuring strength, the larger the sum of the cross-sectional areas of all the vents in the same row, the better.

4. A compact, self-stiffening air spring according to claim 1, characterized in that: The upper end of the inner cylinder (4) of the self-control device is connected to the top plate (1-1) of the airbag by a ball joint (6).

5. A compact, self-stiffening air spring according to claim 2, characterized in that: The lengths of the middle vent hole (4-2) and the lower vent hole (4-3) of the inner cylinder are equal to the suspension travel threshold for improving vehicle ride comfort.

6. A compact, self-stiffening air spring according to claim 2, characterized in that: The distance between the upper edge of the middle vent hole (4-2) and the lower vent hole (4-3) of the inner cylinder is greater than the suspension limit travel.

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