KR102217080B1 - Automotive Shock Absorbers - Google Patents

Abstract

The present invention relates to an automotive shock absorber including a buffer member including: a cylinder in which buffering is performed by pneumatic and hydraulic pressure and spring, and a piston is movably installed; a cylinder cap coupled to the cylinder; a fastening protrusion coupled to the piston and fastened to a car body; and a fixing member coupled to a position adjusting member of the cylinder cap and fixed to a lower arm of a car or a leaf spring suspension of a freight car. The buffer member is installed between the lower arm of the car or the leaf spring suspension of the freight car and the car body to be adjusted in length, thereby preventing vibration from the road surface from being transmitted to the car while actively controlling the vertical vibration or position of the car body, and withstanding the load applied from the car body. The automotive shock absorber is installed between the lower arm of the car or the suspension of the freight car and the car body to alleviate the impact caused by the load transmitted from the car body, thereby reducing the impact by using pneumatic and hydraulic pressure, and is installed universally regardless of the types of cars, thereby easily cushioning the impact caused by the weight applied from the car and providing a good sense of riding comfort.

Description

Automotive Shock Absorbers {Automotive Shock Absorbers}

The present invention relates to a shock absorber for a vehicle, and more particularly, it is installed between a lower arm of a passenger car or a suspension of a freight car and a vehicle body so as to mitigate the shock caused by vibration from the road surface and the load transmitted from the vehicle body. It relates to a shock absorber for automobiles that alleviate the impact by using.

In general, in automobiles, a suspension device is one of devices that absorb vibrations or shocks generated from the road surface while driving to improve the riding comfort and safety of the occupants, and various types of suspension devices are developed and applied to suit the characteristics of the vehicle body.

Currently, many vehicles are equipped with some type of suspension system. A complete suspension system typically includes springs and dampers. The spring may be a forced helical spring, and the damper may be disposed inside the spring. The total amount of force in the spring leg is given by the sum of the force from the spring and the force from the damper. The spring force is determined by the position of the spring leg, and the damping force is given by the speed of the spring leg. This principle is currently applied to most types of automobiles, such as passenger cars and heavy vehicles.

In mass vehicles, gas-hydraulic (hydraulic) suspensions are used in certain cases. Hydropneumatic suspension systems often include hydraulic cylinders, which are filled with hydraulic fluid, connected to an accumulator, and have two chambers separated by a piston. Among the chambers, one chamber on one side of the piston contains hydraulic fluid, and the other chamber on the other side of the piston contains a pneumatic medium constituting the actual spring element. A damping valve is arranged along the flow path of the hydraulic fluid between the hydraulic cylinder and the accumulator, and the function of the damping valve is to create a flow resistance when the hydraulic fluid is forced to flow through the damping valve. In this way, a damping action is applied to the spring action of the vehicle. In this case, the storage device is provided with a separating piston between the substantially incompressible hydraulic fluid and the compressible pneumatic medium.

With such a suspension unit of the prior art, in particular, when the vehicle is heavy, comfort is increased, driving characteristics are improved, vibration is reduced, the influence on the chassis is reduced, and productivity is increased.

Another common solution in the field of vehicle suspension is the use of bellows cylinders. These bellows cylinders are simpler in construction and are often pneumatically driven, but can also be driven by other fluids and mechanical springs. For heavy vehicles, the bellows cylinder is not suitable because it cannot buffer the load in an optimal way. This has the effect of limiting the dynamic behavior of the vehicle, and thus affects the drivability of the vehicle.

The new type of suspension system was mostly not beneficial. As suspension systems are advanced, more and more electronic components are being built into the solution, becoming increasingly complex, and as a result, the suspension system has become more expensive. In addition, the weight of the suspension system has been increased due to all the added functionality. As a result, in the form of increased emissions and costs, the vehicle's environmental impact is increased.

To meet future requirements for environmental compatibility while keeping performance unchanged, there is a need for a suspension system that is more compact and lightweight, but provides the necessary suspension characteristics to ensure improved comfort and good driving dynamics for large vehicles. .

Swedish Patent No. 444 541 discloses a hydraulic suspension system comprising an inner and outer cylinder having two distinct chambers that were initially pre-pressurized by different media (eg oil and gas, respectively, etc.). During a given displacement of the suspension system, the spherical valve opens, at which time the pressure in the two chambers is equalized to change the suspension curve.

Considering the current technology of the suspension system, there is a need for a suspension system that allows the setting of spring properties and the lowest road clearance, is simple, robust and can be manufactured at low cost.

As a prior document for such a suspension system, "Hydraulic Suspension Unit" of Korean Patent Laid-Open Publication No. 2011-0028497 (published on March 18, 2011) is a hydropneumatic suspension unit for a vehicle, an outer sleeve, and an inner sleeve. A damping piston disposed to be slidably displaced in, at least one damping valve positioned at least partially within the damping piston, an inner sleeve disposed to be slidably displaced within the outer sleeve, and a first chamber in the outer sleeve, A first chamber defined at least in part by an inner surface of the outer sleeve and a damping piston, and containing at least one gas configured primarily to provide a spring action and at least one liquid configured to primarily provide a damping action, and the inner side And a second chamber at least partially defined by an inner surface of the sleeve and a damping piston, wherein the gas is in direct contact with a liquid in the first chamber, the first chamber and the second chamber are in fluid communication, and the two chambers It is characterized in that the fluid flow between them is at least partially limited by at least one damping valve on the damping piston.

The above-described prior literature has a problem in that the structure is very complex, and thus the cost increases during manufacturing. In addition, it has a problem that is difficult to apply universally to all vehicles.

In particular, in the case of a freight vehicle, there is a problem in that the buffering action does not occur properly because it cannot withstand the load applied from the vehicle body. In addition, in the case of a lorry, a leaf spring suspension is installed, and there is a problem in that a buffering action due to interlocking with the suspension is not easy.

In addition, since a buffering action such as a spring occurs mainly due to the action of the compressed gas inside the first chamber and the second chamber, when a large load is applied, there is a problem that it is not able to withstand it and damage may occur.

Korean Patent Application Publication No. 2011-0028497 (published on March 18, 2011)

The present invention for solving the above problems is installed between the lower arm of a passenger car or the leaf spring suspension of a freight car and the vehicle body so as to mitigate the shock caused by the load transmitted from the vehicle body and the vibration from the road surface. It is an object to provide a shock absorber for a vehicle that can be installed universally regardless of the type of vehicle, as well as to relieve it using hydraulic pressure.

The present invention is a means for achieving the above object,

A cylinder in which a piston buffered by pneumatic pressure, hydraulic pressure, and spring is movably installed, a cylinder cap coupled to the cylinder, a fastening protrusion coupled to the piston and fastened to the vehicle body, and a positioning member of the cylinder cap A buffer member comprising a fixing member fixed to the lower arm or the plate spring suspension of the freight car is installed in a length adjustable between the lower arm of the passenger car or the leaf spring suspension of the freight car and the vehicle body. An object of the present invention is to provide a shock absorber for a vehicle, characterized in that it prevents vibration from the road surface from being transmitted to the vehicle while being actively controlled, and is capable of withstanding a load applied from the vehicle body.

The buffer member of the present invention includes: a cylinder having a space divided into a hydraulic chamber and a pneumatic chamber by a cylinder on the inside, and in which a piston is movably installed; A cylinder cap coupled to a lower portion of the cylinder to form a coupling protrusion and a position adjustment member to which a spring and a nut, and a fixing member are coupled; A piston installed to be movable inside the cylinder; An oil tank connected to the cylinder and the hydraulic hose to supply oil to the inside of the cylinder or to store the oil returned by the movement of the piston; It characterized in that it comprises a; spring installed between the cylinder cap and the piston.

The cylinder of the present invention includes: a stepped portion formed inside the cylinder so that the piston installed to be movable has a limited rise inside the cylinder; A through hole formed in the cylinder so that the piston rod protrudes toward one side of the cylinder while the piston is engaged; A cylinder groove formed on the inner periphery of the through hole to prevent the air from escaping from the pneumatic chamber to the outside of the cylinder by installing the cylinder seal; A discharge hole formed in the cylinder to discharge the air of the pneumatic chamber divided by the piston; A coupling hole formed to be perpendicular to the discharge hole so that the pneumatic control valve may be coupled; It characterized in that it comprises a; a pneumatic control valve coupled to the coupling hole to adjust the air pressure of the pneumatic chamber divided by the piston.

In the piston of the present invention, when vibration occurs from the road surface while the vehicle is traveling on the road, the weight of the vehicle body moves the piston rod downward from the cylinder 110 through the fastening member, and the spring moves downward with the oil. It is characterized in that the buffering action takes place.

In the piston of the present invention, a phenomenon in which the air pressure in the closed pneumatic chamber decreases while moving toward the cylinder cap, and buffering occurs due to a resistance action to prevent the piston from moving downward due to the phenomenon that the air pressure decreases. It should be characterized.

The cylinder cap of the present invention has a position adjusting member and is screwed to the lower part of the cylinder, and a plurality of fixing nuts for fixing the length adjusted state are connected to the position adjusting member, and the position adjusting member is a lower arm of a passenger car or It characterized in that it comprises a; a fixing member fixed to the plate spring suspension of the freight vehicle.

The oil stored in the cylinder of the present invention is characterized in that the piston buffers the vibration applied from the vehicle body while the oil is introduced into the oil tank through the hydraulic hose by the movement of the cylinder, and a resistance action occurs by the air pressure in the oil tank. do.

The present invention is installed between the lower arm of a passenger car or the suspension of a freight car and the vehicle body so as to mitigate the impact caused by the load transmitted from the vehicle body or the vibration from the road surface, to relieve the impact using pneumatic and hydraulic pressure, as well as Since it can be installed universally regardless of the type, it is possible to easily buffer the impact according to the weight applied from the vehicle, as well as to provide a good ride comfort.

1 is a view showing the configuration of a shock absorber for a vehicle according to the present invention,
2 is a view showing an operating state of the shock absorber for a vehicle shown in FIG.

Hereinafter, the configuration of a shock absorber for a vehicle according to the present invention will be described.

The shock absorber for a vehicle according to the present invention includes a cylinder 110 on which a piston 130 is movably installed to be buffered by pneumatic pressure, hydraulic pressure, and spring 150, and a cylinder cap 120 coupled to the cylinder 110. And, a fastening protrusion 171 coupled to the piston 130 and fastened to the vehicle body and a fixing member coupled to the position adjustment member 123 of the cylinder cap 120 and fixed to the lower arm of a passenger car or the leaf spring suspension of a freight car ( The buffer member 100 including 160) is installed to be adjustable in length between the lower arm of a passenger car or the leaf spring suspension of a freight car and the vehicle body, so that the vibration from the road surface while actively controlling the vertical vibration or posture of the vehicle body It is characterized in that it prevents transmission to the vehicle and allows it to withstand the load applied from the vehicle body.

A shock absorber for a vehicle according to the present invention having the above characteristics will be described in detail with reference to FIGS. 1 and 2.

1 is a view showing a configuration of a shock absorber for a vehicle according to the present invention, and FIG. 2 is a view showing an operating state of the shock absorber for a vehicle shown in FIG.

When described in detail with reference to FIGS. 1 and 2, the shock absorber for a vehicle of the present invention is a buffer member between a lower arm of a passenger car or a leaf spring suspension of a freight car so that the shock absorber can be buffered by pneumatic pressure, hydraulic pressure, and spring 150. 100 is installed.

The buffer member 100 includes a cylinder 110, a cylinder cap 120, a piston 130, an Oing tank 140, a spring 150, a fixing member 160, and a fastening member 170.

The cylinder 110 has a space divided into the hydraulic chamber 112 and the pneumatic chamber 113 by the cylinder 110 on the inside, and the cylinder 110 is installed to be movable inside.

In addition, the cylinder 110 includes a step 111 formed inside the cylinder 110 and a piston 130 so that the piston 130 is movably installed so that a limited rise is made inside the cylinder 110. In the state, a through hole 114 formed in the cylinder 110 so that the piston rod 134 can protrude toward one side of the cylinder 110, and a cylinder seal 116 is installed so that air from the pneumatic chamber 113 The cylinder so that the air in the pneumatic chamber 113 divided by the piston 130 and the cylinder groove 115 formed in the inner periphery of the through hole 114 can be prevented from escaping to the outside of the 110). The pneumatic chamber divided by the discharge hole 117 formed in 110 and the coupling hole 118 formed to be perpendicular to the discharge hole so that the pneumatic control valve 119 can be coupled, and the piston 130 ( It is configured to include a pneumatic control valve 119 coupled to the coupling hole 118 so as to adjust the air pressure of 113).

The piston 130 is coupled to the inside of the cylinder 110 and is installed to be movable.

The piston 130 has a coupling groove 131 formed in the lower portion thereof, and the upper portion of the spring 150 is coupled. In addition, a plurality of piston grooves 132 to which the piston seal is coupled are formed on the outer periphery of the piston 130. A piston seal 133 is installed in the piston groove 132 to prevent the oil in the hydraulic chamber 112 from moving to the pneumatic chamber 113. In addition, the piston 130 has a piston rod 134 installed on the upper portion of the piston 130 and protrudes through the through hole 114 of the cylinder 110 to be coupled with the fastening protrusion 171.

The oil tank 140 is connected to an inlet hole 121 formed in the cylinder 110 by a hydraulic hose 145 so that oil is supplied or discharged into the cylinder 110 according to the movement of the piston 130, As the oil is supplied or discharged, the air pressure in the oil tank 140 acts together to support the load applied from the vehicle body and buffer vibrations generated from the road surface.

The oil tank 140 controls a space formed inside so that oil can be stored, a supply hole 141 through which oil is introduced or discharged, and an air pressure inside the oil tank 140 to control the hydraulic chamber of the cylinder 110. A control hole 143 is formed to control the amount of oil supplied to 112.

A tank cap 142 is installed on the top of the oil tank 140 in which the adjusting hole 143 is formed, and the tank cap 142 adjusts the air pressure in the oil tank 140 to adjust the hydraulic chamber of the cylinder 110 A pressure oil supply and air control valve 144 for controlling the amount of oil supplied to 112 is installed.

The cylinder cap 120 has a spring 150, a fixing nut 124, and a coupling protrusion 122 and a position adjustment member 123 to which the fixing member 160 is coupled, and is screwed to the lower portion of the cylinder 110. .

Further, the position adjusting member 123 is formed under the cylinder cap 120 which is screwed to the lower portion of the cylinder 110, and a screw is formed at the outer periphery. A plurality of fixing nuts 124 for fixing the length adjusted state are coupled to the position adjusting member 123.

The spring 150 is inserted into the coupling protrusion 122 of the cylinder cap 120 while the upper end is located inside the piston groove 132 of the piston 130, and the cylinder 110 moves downward in a fixed state. Allow buffering to occur. In addition, the buffering action of the spring 150 buffers vibrations generated from the road surface while supporting a load applied from the vehicle body by an organic action with oil.

The fastening member 170 has a'ㅛ' shape in cross section and is coupled to the upper portion of the piston rod 134 to be fastened to the vehicle body.

The fixing member 160 is fixed to a lower arm of a passenger car or a leaf spring suspension of a freight car, and is coupled to the position adjusting member 123.

The fixing member 160 allows the position of the cylinder 110 to be adjusted while the position adjusting member 123 is raised or lowered. As described above, the length between the lower arm of the passenger car or the leaf spring suspension of the freight car and the vehicle body is adjusted by adjusting the position of the cylinder 110 as described above.

The operation of the shock absorber for a vehicle according to the present invention configured as described above will be described in detail with reference to FIG. 2.

In the automobile shock absorber of the present invention, when vibration occurs in the vehicle body, it is transmitted to the piston 130 through the fastening protrusion 171 by the load of the vehicle body, and the piston 130 is a cylinder coupled to the lower portion of the cylinder 110 It moves toward the cap 120.

As the oil moves to the oil tank 140 through the hydraulic hose 145 by the piston 130 moving toward the cylinder cap 120, vibration is buffered.

And when the piston 130 returns to its initial state by the spring 150 installed on the cylinder cap 120, the oil stored in the oil tank 140 is supplied back to the inside of the cylinder 110 through the hydraulic hose 145. As a result, it repetitively acts to buffer the vibration from the road surface.

As described above, the buffering action caused by the organic operation by the movement of oil according to the vertical movement of the piston 130 will be described in more detail.

When vibration occurs from the road surface while the vehicle travels on the road, the weight of the vehicle body moves the piston rod 134 downward from the cylinder 110 through the fastening member 170, and the piston 130 moves downward. Together with the silver oil, the spring 150 causes the first vibration to be buffered.

As the piston 130 moves downward, the compressed air in the pneumatic chamber 113 prevents the piston 130 from moving downward while the piston 130 moves downward, and a resistance action to return to its original position occurs secondarily. .

In addition, oil is supplied to the oil tank 140 through the hydraulic hose 145 through the inlet hole 121 of the cylinder 110 by the piston 130, and at this time, the oil supplied into the oil tank 140 Changes the volume of the space in which the air is located, and a resistance force is generated as the air located in the space is compressed, and a resistance action of preventing oil from flowing into the oil tank 140 occurs thirdly.

As described above, the first, second, and third resistance actions occur at the same time, and as well as withstand the load applied from the vehicle body, as well as buffer vibrations generated from the road surface, the attitude of itself is actively controlled and the riding comfort is improved.

In addition, by adjusting the air pressure applied to the piston 130 through the pneumatic control valve 119 installed in the cylinder 110, the riding comfort is adjusted to a hard state or a soft state.

The ride comfort is not controlled only through the pneumatic control valve 119 installed in the cylinder 110, but the supply pressure of oil flowing into the cylinder 110 by adjusting the pressure of air stored in the oil tank 140 Adjust to adjust the ride comfort to a hard or soft state.

Since the pneumatic control valve 119 and the pressure oil supply and air control valve 144 can control a hard or soft ride comfort, it is possible to maintain a suitable ride according to the type of vehicle.

As described above, since the adjustment of the buffering action is made through the adjustment of the amount of oil stored in the cylinder 110 and the oil tank 140, the pneumatic control valve 119 and the pressure oil supply and air control valve 144 It is possible to adjust the condition of the vehicle or the riding comfort of the condition desired by the driver.

The present invention constructed as described above is installed between the lower arm of a passenger car or the suspension of a freight car and the vehicle body so as to mitigate the impact caused by the load transmitted from the vehicle body to relieve the impact by using pneumatic and hydraulic pressure, as well as Since it can be installed universally regardless of the type, there is an advantage of providing a good ride comfort as well as easily buffering the impact according to the weight applied from the vehicle.

While this specification includes details of a number of specific implementations, these should not be construed as limiting to the scope of any design or claim, but rather as a description of features that may be peculiar to a particular embodiment of a particular design. It must be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination. Furthermore, although features operate in a particular combination and may be initially described as so claimed, one or more features from a claimed combination may in some cases be excluded from the combination, and the claimed combination may be a subcombination. Or sub-combination variations.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to aid understanding, and are not intended to limit the scope of the present invention. In addition to the embodiments disclosed herein, it is apparent to those of ordinary skill in the art that other modifications are possible based on the technical idea of the present invention.

100: buffer member 110: cylinder
111: step 112: hydraulic chamber
113: pneumatic chamber 114: through hole
115: cylinder groove 116: cylinder sealing
117: discharge hole 118: coupling hole
119: pneumatic control valve 120: cylinder cap
121: inlet hole 122: coupling protrusion
123: position adjusting member 124: fixing nut
130: piston 131: coupling groove
132: piston groove 133: piston sealing
134: piston rod 140: oil tank
141: supply hole 142: tank cap
143: control hole 144: pressure oil supply and air control valve
145: hydraulic hose 150: spring
160: fixing member 170: fastening member
171: fastening protrusion

Claims (7)

delete The piston 130, which is buffered by pneumatic and hydraulic pressure and the spring 150, is coupled to the cylinder 110 on which the piston 130 is movably installed, and the cylinder cap 120 coupled to the cylinder 110, A buffer member comprising a fastening protrusion 171 fastened to the vehicle body and a fixing member 160 coupled to the position control member 123 of the cylinder cap 120 and fixed to the lower arm of a passenger car or the plate spring suspension of a freight car. (100) is installed to be adjustable in length between the lower arm of a passenger car or the leaf spring suspension of a freight car and the vehicle body to prevent the vibration from the road surface from being transmitted to the vehicle while actively controlling the vertical vibration or posture of the vehicle body, It is to be able to withstand the load applied from the vehicle body,
The buffer member 100 has a space divided into the hydraulic chamber 112 and the pneumatic chamber 113 by the cylinder 110 on the inside, and a cylinder 110 in which the piston 130 is movably installed from the inside;
The cylinder cap 120 is coupled to the lower portion of the cylinder 110 to form the spring 150 and the fixing nut 124, the coupling protrusion 122 to which the fixing member 160 is coupled, and the positioning member 123, respectively, ;
A piston 130 installed to be movable from the inside of the cylinder 110;
An oil tank 140 connected to the cylinder 110 and the hydraulic hose 145 to supply oil to the inside of the cylinder 110 or to store the oil returned by the movement of the piston 130;
A spring 150 installed between the cylinder cap 120 and the piston 130;
A shock absorber for a vehicle, characterized in that configured to include.
The method of claim 2,
The cylinder 110,
Step 111 formed inside the cylinder 110 so that the piston 130 is movably installed so that a limited rise is made inside the cylinder 110;
A through hole 114 formed in the cylinder 110 so that the piston rod 134 protrudes toward one side of the cylinder 110 while the piston 130 is coupled;
A cylinder groove 115 formed on the inner periphery of the through hole 114 to prevent the air from escaping from the pneumatic chamber 113 to the outside of the cylinder 110 by installing the cylinder seal 116;
A discharge hole 117 formed in the cylinder 110 so that the air in the pneumatic chamber 113 divided by the piston 130 can be discharged;
A coupling hole 118 formed at a right angle to the discharge hole 117 so that the pneumatic control valve 119 may be coupled;
A pneumatic control valve 119 coupled to the coupling hole 118 so as to adjust the air pressure of the pneumatic chamber 113 divided by the piston 130;
A shock absorber for a vehicle, characterized in that configured to include.
The method according to claim 2 or 3,
The piston 130,
When vibration occurs from the road surface while the vehicle travels on the road, the weight of the vehicle body moves the piston rod 134 downward from the cylinder 110 through the fastening member 170, and the spring with oil while moving downward. A shock absorber for a vehicle, characterized in that a shock absorbing action occurs by (150).
The method according to claim 2 or 3,
The piston 130,
A phenomenon in which the air pressure in the closed pneumatic chamber 113 decreases while moving toward the cylinder cap 120, and is buffered by a resistance action to prevent the piston 130 from moving downward due to a decrease in the atmospheric pressure. A shock absorber for an automobile, characterized in that this occurs.
The method according to claim 2 or 3,
The cylinder cap 120,
It has a position adjustment member 123 and is screwed to the lower portion of the cylinder 110,
A plurality of fixing nuts 124 for fixing the length adjusted state are coupled to the position adjustment member 123,
The position adjusting member 123 includes a fixing member 160 fixed to a lower arm of a passenger car or a leaf spring suspension of a freight car;
Automobile shock absorber comprising a.
The method according to claim 2 or 3,
Oil stored in the cylinder 110,
As the piston 130 moves the cylinder 110, the oil flows into the oil tank 140 through the hydraulic hose 145, and a resistance action occurs due to the pneumatic pressure in the oil tank 140, thereby reducing the vibration applied from the vehicle body. A shock absorber for a vehicle, characterized in that to buffer.

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