阅读说明：本技术 一种刚度可调气弹簧 (Gas spring with adjustable rigidity ) 是由 陈刚 于 2018-08-02 设计创作，主要内容包括：本发明涉及一种可调刚度气弹簧的调节和量化,其方法是将一变容气室通过串有节流阀或关断阀的连接管与气弹簧相连,通过动力源提供的动力控制变容气室的容积变化来改变气弹簧的刚度,在需要对气弹簧的刚度进行量化调节时,则增加变容气室容积计量装置计算变容气室的有效容积,并根据气弹簧的当前压力大小、初始压力,初始容积大小等参数量化计算并控制气弹簧的刚度。(The invention relates to adjustment and quantification of a gas spring with adjustable rigidity, which is characterized in that a variable-volume gas chamber is connected with the gas spring through a connecting pipe which is connected with a throttle valve or a shut-off valve in series, the volume change of the variable-volume gas chamber is controlled through power provided by a power source to change the rigidity of the gas spring, when the rigidity of the gas spring needs to be quantitatively adjusted, a volume metering device of the variable-volume gas chamber is added to calculate the effective volume of the variable-volume gas chamber, and the rigidity of the gas spring is quantitatively calculated and controlled according to parameters such as the current pressure, the initial pressure and the initial volume of the gas spring.)

1. An adjustable stiffness gas spring comprising: a power source, a variable-volume air chamber, a throttle valve or a shut-off valve, an air spring, a connecting pipe and the like; the method is characterized in that: the variable-volume air chamber is communicated with the air spring through a connecting pipe in series with a throttle valve or a shut-off valve, and the power source drives the volume of the variable-volume air chamber to change so that the rigidity of the air spring changes.

2. The adjustable stiffness gas spring as set forth in claim 1, wherein: the device also comprises a metering device for measuring the volume of the variable volume air chamber.

3. An adjustable stiffness gas spring as claimed in claims 1 and 2 wherein: the hydraulic source is the power supply of varactor air chamber, and the gas receiver of liquid gas accumulator is varactor air chamber, and the volume that changes varactor air chamber is changed by the liquid measure of hydraulic source control business turn over liquid gas accumulator to this changes rigidity.

4. An adjustable stiffness gas spring as claimed in claims 1 and 2 wherein: the hydraulic source is a power source of the variable-volume air chamber, the air storage chamber of the hydraulic cylinder-air cylinder is the variable-volume air chamber, and the liquid volume entering and exiting the liquid storage cylinder side of the hydraulic cylinder-air cylinder is controlled by the hydraulic source to change the volume of the variable-volume air chamber on the air cylinder side, so that the rigidity of the air spring is changed.

5. An adjustable stiffness gas spring as claimed in claims 1 and 2 wherein: the variable-volume air chamber mainly comprises a single-acting cylinder, and the piston displacement of the single-acting cylinder is driven by a power source to change the volume of the cylinder, so that the rigidity of the air spring is changed.

6. A multiple variable stiffness gas spring formed by a plurality of adjustable stiffness gas springs according to claims 1 and 2, characterized in that: the volume change adjusting devices of the variable-volume air chambers are linked, namely the volume of one variable-volume air chamber is changed and the volumes of the other linked variable-volume air chambers are synchronously changed.

Technical Field

The invention relates to adjustment and quantification of a stiffness-adjustable gas spring, which is particularly suitable for controlling the stiffness of a spring of an automobile stiffness-adjustable suspension by taking compressed gas as an elastic medium.

Background

Due to the nonlinear rigidity characteristic of the gas spring, the gas spring has better vibration damping and vibration isolation performance and is more and more popular in application. The rigidity of the gas spring is determined by the volume and the pressure of the gas storage chamber, and when the pressure of the gas chamber is basically unchanged, the larger the volume of the gas chamber is, the smaller the rigidity is, and the smaller the volume of the gas chamber is, the larger the rigidity is. The change of the volume and pressure of the air chamber is usually realized by an air-entrapping pump and supporting facilities thereof, so that the structure is complex and the cost is high.

In addition, in the variable stiffness gas spring for vehicle suspension, since stiffness adjustment needs to be calculated according to load, and proper stiffness is adjusted according to load, the measurement of the volume change of the variable stiffness gas spring is particularly important, when stepless adjustment is adopted, the measurement of the volume change is difficult, the quantitative control of increasing and decreasing the stiffness value becomes particularly complex, and particularly the control of synchronously increasing and decreasing the stiffness is difficult.

Disclosure of Invention

Technical problem to be solved by the invention

The problems of complex structure and high cost of the stepless rigidity adjusting gas spring are solved;

secondly, the problem that the rigidity change of the gas spring cannot be calculated quantitatively is solved;

and thirdly, the problem that the vehicle suspension needs a plurality of gas springs to change rigidity synchronously and is difficult to realize is solved.

Technical scheme of the invention

The method adopted by the invention is that a variable-volume air chamber is connected with the air spring through a connecting pipe which is serially connected with a throttle valve or a shut-off valve, the rigidity of the air spring is changed by controlling the volume change of the variable-volume air chamber through the power provided by a power source, when the rigidity of the air spring needs to be quantitatively adjusted, the volume metering device of the variable-volume air chamber is added to calculate the effective volume of the variable-volume air chamber, and the rigidity of the air spring is quantitatively calculated and controlled according to the current pressure of the air spring, the volume of the current variable-volume air chamber, the total initial air storage volume, the initial air storage.

When the air spring adopts the throttle valve, the influence of the rapid change of the pressure in the air spring on the pressure in the variable-volume air chamber is small due to the action of the throttle valve, namely the influence of the instantaneous rigidity of the air spring on the variable-volume air chamber is small; the smaller the drift diameter of the throttle valve is, the faster the pressure change rate of the gas spring is, and the smaller the influence of the variable-volume gas chamber on the instantaneous rigidity of the gas spring is. When the instantaneous rigidity of the air spring is adjusted, the volume of the variable-volume air chamber is changed, so that the air spring and the variable-volume air chamber form pressure difference, and the air in the air spring slowly enters and exits the variable-volume air chamber through the throttle valve under the continuous action of the pressure difference until the pressure difference disappears.

The instantaneous stiffness refers to the stiffness of the gas spring in a short time, and in the variable-stiffness gas spring adopting the throttle valve, under the condition of certain pressure, the total volume of the variable-volume gas chamber and the gas spring is constant, namely under the condition of certain pressure, the stiffness is constant when the time is long enough. However, due to the effect of the throttle valve, when the load of the gas spring changes rapidly, the gas flow on the side of the gas spring cannot enter and exit the variable-volume gas chamber in time, so that the rigidity of the variable-volume gas chamber is not affected basically, and the rigidity of the gas spring is almost only related to the volume of the gas spring and the current pressure in a short time.

When the rigidity of the air spring using the shut-off valve needs to be adjusted, the shut-off valve is opened to change the volume of the variable-capacity air chamber, after the rigidity adjustment is completed, the shut-off valve is closed, and the rigidity of the air spring after the valve is closed is not influenced by the volume of the variable-capacity air chamber any more.

A power source: the device for providing variable capacity power for the variable capacity air chamber comprises a hydraulic source, a push rod motor, a linear motor, a motor for driving a gear rack to rotate to move linearly through the rotation of the motor, a manual adjusting device and the like.

The varactor gas chamber includes: gas storage devices with variable volume, such as liquid-gas accumulators, hydraulic cylinder-air cylinders, single-acting air cylinders, etc.; the liquid-gas energy accumulator changes the volume of the gas chamber by changing the liquid filling amount of the liquid storage cavity in the liquid-gas energy accumulator. The hydraulic cylinder-air cylinder is formed by filling liquid into one chamber of the hydraulic cylinder or the air cylinder and filling gas into the other chamber, and the volume of the air chamber is changed by changing the liquid filling amount of the liquid filling cavity. Single-acting cylinders directly vary the volume of the air chamber by varying the piston position.

Gas spring: the component with the compressed gas as the energy storage medium and the elastic function comprises: a liquid-gas energy accumulator, an air bag type supporting spring, a piston type gas supporting rod and the like; when the liquid-gas energy accumulator is used as a gas spring, compressed gas of the liquid-gas energy accumulator is an energy storage medium, and hydraulic oil is a force transmission medium; when the liquid-gas energy accumulator is used as a gas spring, a hydraulic cylinder communicated with a liquid storage cavity of the liquid-gas energy accumulator is usually used as an actuating element of the gas spring to convert the elastic potential energy of the gas spring into kinetic energy.

Scheme 1. an adjustable stiffness gas spring includes: a power source, a variable-volume air chamber, a throttle valve or a shut-off valve, an air spring, a connecting pipe and the like; the method is characterized in that: the variable-volume air chamber is communicated with the air spring through a connecting pipe in series with a throttle valve or a shut-off valve, and the power source drives the volume of the variable-volume air chamber to change so that the rigidity of the air spring changes.

Scheme 2. the adjustable rigidity gas spring of scheme 1, characterized by: the device also comprises a metering device for measuring the volume of the variable volume air chamber.

Because the total volume of the variable-volume air chamber and the air spring is not changed under the condition of certain pressure, the volume of the variable-volume air chamber is measured by the volume metering device, and the rigidity of the current air spring can be calculated according to related known conditions, such as the current pressure, the initial pressure, the total volume under the initial pressure and the like. The volume metering device of the variable-volume air chamber is arranged, so that a user can set and measure the rigidity of the air spring at will according to the requirement.

The volume of the variable volume air chamber is calculated by measuring the piston stroke and calculating the liquid amount entering and exiting the liquid-gas accumulator.

The hydraulic cylinder-air cylinder or single-acting air cylinder is used as the variable-volume air chamber, a device for measuring the piston stroke can be directly additionally arranged, and the volume of the air cylinder side is calculated by measuring the piston stroke, so that the volume of the variable-volume air chamber is calculated.

The method for measuring the piston stroke or the piston position is more, the length of the piston rod extending out of the hydraulic cylinder can be measured, a magnetic ring can be additionally arranged on the piston, and the position of the piston can be measured outside the cylinder barrel through magnetic induction.

Other metering methods can also be adopted to meter the effective volume of the variable volume air chamber, such as a flowmeter is additionally arranged on a liquid inlet and outlet connecting pipe of the variable volume air chamber.

Scheme 3. the adjustable rigidity gas spring of scheme 1, 2 its characterized in that: the hydraulic source is the power supply of varactor air chamber, and the gas receiver of liquid gas accumulator is varactor air chamber, and the volume that changes varactor air chamber is changed by the liquid measure of hydraulic source control business turn over liquid gas accumulator to this changes rigidity. The liquid amount in the liquid-gas energy storage device is increased, the volume of the gas spring is increased, and the rigidity is reduced; the liquid amount in the liquid-gas energy storage device is reduced, the volume of the gas spring is reduced, and the rigidity is increased.

Scheme 4. the adjustable rigidity gas spring of scheme 1, 2, characterized by: the hydraulic source is a power source of the variable-volume air chamber, the air storage chamber of the hydraulic cylinder-air cylinder is the variable-volume air chamber, and the volume of the variable-volume air chamber on the side of the air cylinder is changed by controlling the liquid amount of the hydraulic cylinder-air cylinder entering and exiting the liquid storage chamber, so that the rigidity of the air spring is changed. The liquid amount in the hydraulic cylinder is increased, the volume of the gas spring is increased, and the rigidity is reduced; the liquid amount in the hydraulic cylinder is reduced, the volume of the gas spring is reduced, and the rigidity is increased.

Scheme 5. the adjustable rigidity gas spring of scheme 1, 2 its characterized in that: the variable-volume air chamber mainly comprises a single-action cylinder, and the piston of the single-action cylinder is driven by a motor to move so as to change the volume of the cylinder and change the rigidity of the air spring.

The piston position of the single-acting cylinder moves to the left, the volume and the rigidity of the air spring become smaller, and the piston position moves to the right, the volume and the rigidity of the air spring become larger and smaller.

The power source includes: a push rod motor, a linear motor or a motor which drives a gear rack to move linearly by a motor, etc.

Scheme 6. the multiple variable stiffness gas spring that constitutes of adjustable stiffness gas spring like scheme 1, 2, characterized by: the volume change adjusting device of the variable volume air chambers is linked, namely the volume of one variable volume air chamber changes and the volumes of other linked variable volume air chambers change synchronously, and the method comprises the following steps:

1. when the variable volume air chamber is a liquid-gas energy accumulator, a multi-connected (parallel) hydraulic cylinder is adopted to synchronously supply liquid to the variable volume air chamber, so that the volume of the gas accumulator is synchronously increased and decreased.

2. When the variable-volume air chamber is a hydraulic cylinder-air cylinder combined air accumulator or a single-action air cylinder, the hydraulic cylinder-air cylinder or the single-action air cylinder is connected in parallel to act, so that the volume in the air cylinder is synchronously increased and decreased.

The invention has the advantages of

Firstly, the structure of the adjustable-stiffness gas spring is simpler, the realization is easier, and the cost is lower;

secondly, the effective volume variable quantity of the variable-stiffness gas spring is quantitatively calculated, and any stiffness can be accurately adjusted and metered within the stiffness adjustable range according to the requirement;

and thirdly, the synchronous rigidity changing of the plurality of gas springs is simple and feasible, and the quantitative calculation of the rigidity can be realized.

Drawings

FIG. 1 is a schematic diagram of a stiffness-adjustable gas spring composed of two liquid-gas accumulators and a hydraulic source

FIG. 2 is a schematic diagram of a stiffness-adjustable gas spring composed of a hydraulic cylinder, two liquid-gas accumulators and a hydraulic source

FIG. 3 is a schematic diagram of a gas spring with adjustable rigidity, which is composed of a hydraulic cylinder-air cylinder, a hydraulic source and a liquid-gas energy accumulator

FIG. 4 is a schematic view of a stiffness-adjustable gas spring composed of a single-acting cylinder and a liquid-gas accumulator

FIG. 5 is a schematic diagram of a stiffness-adjustable gas spring composed of a multi-connected hydraulic cylinder, a hydraulic source and a liquid-gas energy accumulator

Graphic numbering names:

1-two-position two-way electromagnetic valve 2-hydraulic pump 3-liquid storage cavity

4-liquid-gas accumulator (variable volume gas chamber) 5-gas storage cavity (variable volume gas chamber) 6-throttle valve

7-gas pipe 8-gas storage cavity (gas spring cavity) 9-liquid gas energy storage device (liquid gas spring)

10-liquid storage cavity 11-hydraulic cylinder 12-hydraulic cylinder-air cylinder air storage cavity

Liquid storage cavity of 13-hydraulic cylinder-air cylinder 14-piston 15-hydraulic cylinder-air cylinder

Oil inlet and outlet of liquid storage cavity of 16-quadruple synchronous hydraulic cylinder-air cylinder 17-hydraulic cylinder-air cylinder

18-air storage cavity inlet and outlet of hydraulic cylinder-air cylinder 19-flowmeter 20-air cylinder.

Detailed Description

Preferred embodiment 1: (figure 1) adjustable rigidity gas spring composed of two liquid-gas energy accumulators and hydraulic source

The adjustable rigidity air spring of this scheme includes: two liquid-gas energy accumulators (4,9), a connecting pipe (7) in series with a throttle valve (6), a hydraulic source with an electromagnetic valve (1), a hydraulic cylinder (11) and the like.

As shown in fig. 1: the air storage chambers (5, 8) of the two liquid-gas energy storages (4,9) are communicated through a connecting pipe (7) which is serially connected with a throttle valve (6), and a hydraulic source controls the liquid amount entering and exiting the liquid storage cavity (3) of the liquid-gas energy storages to control the volume of the air storage cavity (5) (variable volume air chamber), thereby controlling the air storage amount of the air storage cavity (5) (air spring cavity) and changing the rigidity of the air spring (8). The gas spring (8) converts elastic potential energy and kinetic energy through a hydraulic cylinder (11).

Preferred embodiment 2: (figure 2) adjustable rigidity gas spring composed of two liquid-gas energy accumulators and hydraulic source

The adjustable rigidity air spring of this scheme includes: two liquid-gas energy accumulators (4,9), a flowmeter (19), a connecting pipe (7) in series with a throttle valve (6), a hydraulic source with an electromagnetic valve (1), a hydraulic cylinder (11) and the like.

As shown in fig. 2: the air storage chambers (5, 8) of the two liquid-gas energy storages (4,9) are communicated through a connecting pipe (7) in series with a throttle valve (6), liquid flow of a hydraulic source is metered through a flowmeter (19) and then enters and exits the liquid storage cavity (3) of the liquid-gas energy storage (4), and therefore the volume of the air storage cavity (5) (variable volume air chamber) is controlled, and the rigidity of the air spring (8) is changed. The flowmeter is used for measuring the liquid amount entering and exiting the liquid-gas energy accumulator (4) and indirectly measuring the volume of the variable-volume air chamber (5).

The gas spring converts elastic potential energy and kinetic energy through a hydraulic cylinder (11).

Preferred embodiment 3: (figure 3) adjustable rigidity gas spring composed of hydraulic cylinder-air cylinder, hydraulic source and liquid-gas energy accumulator

The adjustable rigidity air spring of this scheme includes: the hydraulic system comprises a hydraulic cylinder-air cylinder (13), a connecting pipe (7) in series with a throttle valve (6), a hydraulic source with an electromagnetic valve (1), a liquid-air energy accumulator (9), a hydraulic cylinder (11) and the like.

As shown in fig. 3: the air storage chamber (12) of the hydraulic cylinder-air cylinder (13) is communicated with the air storage chamber (8) of the liquid-air energy accumulator (9) through a connecting pipe (7) in which a throttle valve (6) is connected in series, and the hydraulic source (2) controls the hydraulic cylinder piston (14) to move left and right so as to control the volume of the air storage chamber (12) (variable volume air chamber) of the hydraulic cylinder-air cylinder (13), thereby controlling the air storage amount of the liquid-air energy accumulator air storage chamber (8) (air spring chamber) and changing the rigidity of the air spring (8). The gas spring (8) converts elastic potential energy and kinetic energy through a hydraulic cylinder (11).

When the volume of the air storage chamber (13) of the hydraulic cylinder-air cylinder needs to be measured, a magnetic ring is arranged on the piston, the position of the piston is measured in an electromagnetic induction mode outside the cylinder, and the volume of the piston is calculated according to the position of the piston, the cylinder diameter of the hydraulic cylinder and other parameters.

Preferred embodiment 4: (figure 4) adjustable rigidity gas spring composed of cylinder, push rod motor and liquid-gas energy accumulator

The adjustable rigidity air spring of this scheme includes: the device comprises an air cylinder (20), a connecting pipe (7) in series connection with a throttle valve (6), a push rod motor, a hydraulic cylinder (11), a liquid-gas energy accumulator (9) and the like.

As shown in fig. 4: the gas storage chamber (12) of the air cylinder (20) is communicated with the gas storage chamber (8) of the liquid-gas energy storage device (9) through a connecting pipe (7) in which a throttle valve (6) is connected in series, and the push rod motor drives the piston (14) to move left and right so as to control the volume of the gas storage chamber (12) (variable volume gas chamber) of the air cylinder (20), thereby controlling the gas storage amount of the gas storage chamber (8) (gas spring chamber) of the liquid-gas energy storage device and changing the rigidity of the gas spring (8). The gas spring (8) converts elastic potential energy and kinetic energy through a hydraulic cylinder (11).

Preferred embodiment 5: (figure 5) adjustable rigidity gas spring composed of four-linkage synchronous hydraulic cylinder-air cylinder, hydraulic source and four liquid-gas energy accumulators

The adjustable rigidity air spring of this scheme includes: the hydraulic system comprises a quadruple synchronous hydraulic cylinder, a cylinder (16), a connecting pipe (7) connected with a throttle valve (6) in series, four liquid-gas energy accumulators (9), four hydraulic cylinders (11) and the like.

As shown in fig. 5: the air storage chambers of the hydraulic cylinders and the air cylinders are communicated with the air storage chambers of the liquid-gas energy storage device in groups through connecting pipes (7) in series with throttle valves (6), and the hydraulic source (2) controls pistons of the four hydraulic cylinders (16) to move left and right synchronously so as to control the volume of the air storage chambers (variable volume air chambers) of the hydraulic cylinders and the air cylinders to change synchronously, thereby controlling the air storage capacity of the air storage chambers (8) (air spring chambers) of the liquid-gas energy storage device and enabling the rigidity of the four air springs to change synchronously. The gas spring converts elastic potential energy and kinetic energy through a hydraulic cylinder (11).