KR20170010146A - Apparatus for inspecting characteristic of air spring - Google Patents

Apparatus for inspecting characteristic of air spring Download PDF

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Publication number
KR20170010146A
KR20170010146A KR1020150100339A KR20150100339A KR20170010146A KR 20170010146 A KR20170010146 A KR 20170010146A KR 1020150100339 A KR1020150100339 A KR 1020150100339A KR 20150100339 A KR20150100339 A KR 20150100339A KR 20170010146 A KR20170010146 A KR 20170010146A
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KR
South Korea
Prior art keywords
air spring
air
actuator
volume
pressure
Prior art date
Application number
KR1020150100339A
Other languages
Korean (ko)
Inventor
임만승
이수창
김종형
Original Assignee
대원강업주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 대원강업주식회사 filed Critical 대원강업주식회사
Priority to KR1020150100339A priority Critical patent/KR20170010146A/en
Publication of KR20170010146A publication Critical patent/KR20170010146A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/052—Pneumatic spring characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
    • G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0075—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by means of external apparatus, e.g. test benches or portable test systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/15—Fluid spring
    • B60G2202/152—Pneumatic spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B60G2500/201—Air spring system type

Abstract

The present invention relates to an apparatus to inspect characteristics of a volume-changeable air spring, and aims to provide an apparatus to inspect characteristics of a volume-changeable air spring, which is able to precisely and easily inspect characteristics of a volume-changeable air spring. To this end, the present invention provides an apparatus to inspect characteristics of a volume-changeable air spring whose internal volume is changed by turning on/off a solenoid valve which is placed on an internal barrier rib, which comprises: an inspection table on which the air spring is installed; an air tank which stores air at a certain pressure and which is connected to the air spring, which is installed on the inspection table, to fill the air spring with air; an actuator which is installed on the inspection table and which applies force to the air spring, which is installed on the inspection table, to transform the air spring in the direction of compression and the direction of tension; a load cell which is installed on the inspection table to detect the magnitude of force which is applied to the air spring; a displacement sensor which detects the quantity of transformation of the air spring; a pressure sensor which detects the pressure of the air spring; and a controller which controls the actuator and the solenoid valve, which receives the detection values from the load cell, the displacement sensor, and the pressure sensor, and which detects characteristics of the air spring from the received detection values.

Description

Technical Field [0001] The present invention relates to an apparatus for inspecting characteristics of an air spring,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for inspecting the characteristics of an air spring, and more particularly, And the characteristics of the air spring are inspected while the air spring is inspected.

2. Description of the Related Art Generally, a suspension device of a vehicle is designed to absorb vibration or impact generated during driving while supporting the weight of the vehicle body to relieve vibration or impact transmitted to the vehicle body and the driver, thereby ensuring ride comfort and running stability. Respectively.

On the other hand, the most common type of suspension device has a structure in which a coil spring and a shock absorber are combined. Such a suspension device provides an improved ride feeling to the passenger through the complementary action between the coil spring and the damper.

However, in the case of suspension devices using coil springs and dampers, the characteristics of the suspension device can not be freely changed due to the characteristics of the coil spring made of spring steel, and a difference in ride feeling is caused by a change in the load load or a change in the number of passengers There is a problem.

In consideration of this problem, an air suspension constructed using air springs instead of coil springs is applied to high-grade cars and large-sized cars.

The air spring has a structure for filling air with a predetermined pressure in a sleeve of a rubber bag whose top and bottom ends are sealed by a cap and a piston to relieve vibration and impact through compression and expansion of the sleeve.

On the other hand, the air spring normally has a spring constant value set lower than that of the coil spring, so that the natural frequency of the vehicle is lowered, thereby improving the ride quality. However, when the spring constant value is set too low, the adjustment stability of the vehicle is deteriorated. In this way, the two characteristics of ride comfort and adjustment stability are related to one another if the other improves.

However, since the spring constant of the air spring according to the related art is fixed to a constant value, there is a problem that when the ride comfort is improved, the adjustment stability is sacrificed and the ride comfort is sacrificed if the adjustment stability is improved.

An air spring is disclosed in Patent Publication No. 10-2012-0032782 in order to change the spring constant in consideration of such a problem, and FIG. 1 shows a sectional view of the air spring disclosed in the above-mentioned invention.

The air spring of the present invention includes a first body 10 fixed to a vehicle body side, a second body 20 fixed to a wheel side, an air sleeve 30 installed between the first and second bodies, A valve structure 40 installed in the first body 10 to form a plurality of chambers by dividing an internal space of the air spring and an opening and closing device 50 for opening and closing the valve structure 40 And has a structure for varying the air spring constant by changing the volume of the internal space of the air spring by opening and closing the valve structure.

The valve structure 40 includes a fixed plate 41 and a valve body 42. A fixing hole is formed in the fixed plate 41. A through hole is formed in the valve body 42, The valve body 42 is rotated by the opening / closing device 50 composed of a motor so that the fixing hole and the through hole are aligned or shifted to open and close the valve structure.

As described above, the air spring having such a valve structure has an advantage that the spring constant can be varied by changing the volume of the air spring. However, the rotation shaft connecting the valve body and the motor passes through the body constituting the air spring And the rotary shaft has a structure that rotates for the operation of the valve structure, there is a high risk of air leakage. Further, since a separate motor must be additionally installed outside the air spring, the volume of the air spring is increased And it is difficult to secure space for installation of the air spring.

In consideration of the above-mentioned problem of the conventional volume change type air spring, the applicant of the present invention has proposed a solenoid valve which is provided inside the air spring, and which is capable of inducing a change in the internal volume of the air spring by on / off of the solenoid valve And developed a changeable air spring.

In order to realize the optimum performance of the volume change type air spring, it is necessary to grasp the characteristics of the volume change type air spring and to adjust the characteristics of the volume change type air spring in accordance with the specification of the vehicle .

However, there is a problem that the characteristics of the volume change type air spring can not be accurately grasped due to the absence of the inspection equipment for accurately examining the characteristics of the volume change type air spring.

Open Patent Publication No. 10-2012-0032782 (published Apr. 06, 2012)

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus for inspecting the characteristics of a volume change type air spring which can accurately and easily inspect the characteristics of the volume change type air spring.

According to an aspect of the present invention, there is provided a method of inspecting characteristics of a volume change type air spring in which an internal volume is changed by on / off operation of a solenoid valve provided in an internal partition wall An apparatus comprising: a test stand on which the air spring is installed; An air tank for storing air at a predetermined pressure and connected to an air spring installed in the examination table to fill the air spring with air; An actuator installed on the examination table for applying a force to the air spring installed on the examination table to deform the air spring in a compression direction and a tensile direction; A load cell installed on the inspection table for detecting a magnitude of a force applied to the air spring; A displacement sensor for detecting a deformation amount of the air spring; A pressure sensor for detecting a pressure of the air spring; And a controller for controlling the actuator and the solenoid valve, receiving the respective detection values detected by the load cell, the displacement sensor and the pressure sensor, and detecting the characteristics of the air spring from the respective detection values received The present invention provides an apparatus for inspecting the characteristics of a volume change type air spring.

In the apparatus for inspecting the characteristics of the volume change type air spring, the controller controls the actuator such that the air spring is deformed in the compressing direction and the tensile direction. When the air spring reaches a predetermined displacement, the solenoid valve is turned on / Off operation of the solenoid valve, and receive detection values from the displacement sensor, the pressure sensor, and the load cell when the solenoid valve is turned on and off, respectively.

Meanwhile, in the apparatus for inspecting the characteristics of the volume change type air spring, the actuator may be constituted by a hydraulic cylinder.

Meanwhile, in the apparatus for inspecting the characteristics of the volume change type air spring, the displacement sensor may be configured to detect the displacement of the air spring by detecting the displacement of the pressure plate that transmits the force to the air spring while moving by the operation of the actuator.

According to the present invention having the above characteristics, it is possible to accurately check the characteristics of the volume change type air spring, and thus it is possible to more easily provide the volume change type air spring having the characteristics optimized according to the specification of the vehicle It is effective.

1 is a cross-sectional view of the air spring disclosed in the above-
2 is a structural view of a characteristic inspection apparatus according to a preferred embodiment of the present invention.
3 is a graph showing the relationship between load and displacement,
4 is a graph showing the relationship between load, displacement, and time.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a structural view of a characteristic inspection apparatus according to a preferred embodiment of the present invention.

The apparatus for inspecting a characteristic according to the present invention is an apparatus for inspecting characteristics of a volume change type air spring 1 whose internal volume is changed by on / off operation of a solenoid valve 60 provided on an internal partition wall, An air tank 120, an actuator 130, a load cell 140, a displacement sensor 150, a pressure sensor 160, and a controller 170.

The inspection table 110 is a frame for forming the basic structure of the characteristic inspection apparatus according to the present invention and provides a space for installing an air spring to be measured. The actuator 130, the load cell 140, and the air tank 120, It may be configured in various structures without any particular limitation in the structure thereof.

The air tank 120 is a tank in which air to be filled in the air spring is stored. The tank is connected to an air spring installed on the inspection table 110 and is filled with air by an air spring.

The air tank 120 may be installed on the inspection table 110 or may be installed separately from the inspection table 110. The air tank 120 may be connected to a compressor (not shown)

The actuator 130 applies force to the air spring installed on the inspection table 110 to guide the air spring to be deformed in the compressing direction or the tensile direction and is installed in the inspection table 110.

According to a preferred embodiment of the present invention, the actuator 130 is constituted by a hydraulic cylinder. The actuator 130 is installed on the inspection table 110 so as to be positioned vertically above the air spring. The pressure plate 131 is installed at the lower end, So as to induce deformation of the air spring.

The load cell 140 detects the magnitude of force applied from the actuator 130 to the air spring, and is installed between the inspection stand 110 and the air spring.

The displacement sensor 150 detects the amount of deformation of the air spring and may include a known LVDT (Linear Variable Differential Transformer) sensor mounted on the rod of the hydraulic cylinder, or a displacement detecting sensor for detecting the position of the pressure plate 131 And the sensor 150 may be installed on the inspection table 110 or the actuator 130. [

The pressure sensor 160 detects the internal pressure of the air spring which is deformed by the operation of the actuator 130 and is installed in the inspection table 110.

The controller 170 controls the actuator 130 and the solenoid valve 60 and receives the respective detection values detected by the load cell 140, the displacement sensor 150 and the pressure sensor 160, And the characteristic of the air spring is detected from each detection value.

The controller 170 includes a DAQ module 171 for processing signals generated by the load cell 140, the displacement sensor 150, and the pressure sensor 160 so that the computer can recognize the signals, And a display device 172 for displaying an image.

The controller 170 controls the actuator 130 so that the air spring is deformed in the compressing direction and the tensile direction. When the air spring reaches a predetermined displacement, the controller 170 turns on / off the solenoid valve 60, And receives the detection values from the displacement sensor 150, the pressure sensor 160, and the load cell 140 in the ON and OFF states of the valve, respectively, and detects the characteristics of the air spring.

On the other hand, the controller 170 detects the Friction (Friction) in the air spring due to the ON / OFF of the solenoid valve 60 by using the detection values received from the displacement sensor 150, the pressure sensor 160 and the load cell 140 ), The difference in the air spring constant, the responsiveness of the air spring, and the dynamic characteristics depending on the volume difference.

For reference, the friction in the air spring generates hysteresis (damping) during tension and compression due to the inherent characteristics of the air spring. The controller 170 detects the pressure difference between the pressure sensor 160 And a displacement value obtained from the displacement sensor 150. The user uses the provided graph to determine the internal friction of the corresponding air spring do.

Next, the constant of the air spring is information obtained from the load value and the displacement value, and is obtained by calculating the slope in the section of -5 mm to + 5 mm in the graph shown in FIG.

Finally, the response and dynamic characteristics of the air spring are obtained from the load value and the displacement value. In the case of the air spring, as shown in FIG. 4, since the load and deformation occur with a certain time difference, 4, and analyzes the response and dynamic characteristics of the air spring from the graph.

As described above, the apparatus for inspecting the characteristics of the volume-changeable air spring according to the present invention changes the displacement applied to the air spring variously, and furthermore, through the on / off operation of the solenoid valve provided in the air spring, The amount of deformation generated in the air spring, the magnitude of the force applied to the air spring, and the pressure inside the air spring are obtained from the displacement sensor, the load cell, and the pressure sensor, respectively. Information such as the air spring internal friction, the change of the top of the air spring, the response of the air spring, and the dynamic characteristic according to the volume difference, which are illustrated above, to the user.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
110: inspection table 120: air tank
130: actuator 131: pressure plate
140: load cell 150: displacement sensor
160: Pressure sensor 170: Controller

Claims (4)

An apparatus for inspecting characteristics of a volumetric change type air spring whose internal volume is changed by on / off operation of a solenoid valve provided on an internal partition wall,
A test stand 110 on which the air spring is installed;
An air tank 120 for storing air at a predetermined pressure and connected to an air spring installed in the inspection table 110 to fill the air spring with air;
An actuator 130 mounted on the examination table 110 for applying a force to the air spring installed on the examination table 110 so that the air spring is deformed in the compressing direction and the tensile direction;
A load cell 140 installed on the inspection table 110 to detect a magnitude of a force applied to the air spring;
A displacement sensor 150 for detecting the amount of deformation of the air spring;
A pressure sensor 160 for detecting the pressure of the air spring; And
And controls the actuator 130 and the solenoid valve to receive the respective detection values detected by the load cell 140, the displacement sensor 150 and the pressure sensor 160, And a controller (170) for detecting characteristic information of the volume change type air spring. The method according to claim 1,
The controller 170 controls the actuator 130 such that the air spring is deformed in the compressing direction and the tensile direction. When the air spring reaches a predetermined displacement, the controller 170 turns on / off the solenoid valve, And a detection value is received from the displacement sensor (150), the pressure sensor (160), and the load cell (140) in the operation and the off operation, respectively. The method according to claim 1,
Wherein the actuator comprises a hydraulic cylinder. The method according to claim 1,
Wherein the displacement sensor (150) detects the displacement of the pressure plate (131) that transmits force to the air spring while moving by the operation of the actuator (130) and detects the amount of deformation of the air spring Inspection device.
KR1020150100339A 2015-07-15 2015-07-15 Apparatus for inspecting characteristic of air spring KR20170010146A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109109604A (en) * 2018-08-31 2019-01-01 江苏科技大学 A kind of air spring volume adjustment mechanism and its control method
CN111076920A (en) * 2020-01-14 2020-04-28 赖建凤 Spring fatigue test machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120032782A (en) 2010-09-29 2012-04-06 주식회사 만도 Air spring with a variable spring constant

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120032782A (en) 2010-09-29 2012-04-06 주식회사 만도 Air spring with a variable spring constant

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109109604A (en) * 2018-08-31 2019-01-01 江苏科技大学 A kind of air spring volume adjustment mechanism and its control method
CN111076920A (en) * 2020-01-14 2020-04-28 赖建凤 Spring fatigue test machine
CN111076920B (en) * 2020-01-14 2021-10-22 南京金升华包装材料有限公司 Spring fatigue test machine

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