KR20160134090A

KR20160134090A - Oil Shock Absorber

Info

Publication number: KR20160134090A
Application number: KR1020150067528A
Authority: KR
Inventors: 정기돈
Original assignee: 주식회사 만도
Priority date: 2015-05-14
Filing date: 2015-05-14
Publication date: 2016-11-23

Abstract

The present invention relates to a steering damper, wherein oil is filled as work fluid. A gas discharge passage is formed in a rod guide in order to enable cavitation foam generated inside an inner container to be discharged to a storage chamber via an oil discharge hole after passing through the gas discharge passage formed in the rod guide. Therefore, negative pressure is reduced to reduce damping delay generation to improve performance of a shock absorber when the shock absorber is operated.

Description

Oil Shock Absorber

The present invention relates to a steering damper in which oil is filled as an operating fluid, and more particularly, to a steering damper in which a cavitation bubble generated inside a tensioning and compression stroke is rapidly discharged to reduce the occurrence of a damping delay, To an oil shock absorber capable of improving performance.

Generally, a suspension device of a vehicle connects an axle and a vehicle body to prevent damage to the vehicle body and cargo by controlling the behavior of the vehicle body so that vibrations or shocks that the axle receives from the road surface during traveling can not be directly transmitted to the vehicle body, to be.

Such suspension devices include a chassis spring for relieving an impact from the road surface, a damper for controlling the free vibration of the chassis spring by damping control to improve ride comfort, and a stabilizer bar for suppressing rolling of the vehicle.

Here, the stabilizer bars are provided on both sides of the vehicle body, and both ends thereof are mounted on the lower arm or the strut bar through the stabilizer link, so that the left and right wheels do not act when the left and right wheels simultaneously move up and down, In case of up and down motion, it acts as an anti-roll which restrains the roll of the body by twisting the torsional restoring force that occurs while twisting.

That is, the stabilizer bar is twisted when the outside of the turning of the vehicle body is tilted by the centrifugal force or when the left and right wheels have a relative phase difference due to the bump or rebound during running, and stabilizes the attitude of the vehicle body with the restoring force .

However, the conventional stabilizer bar is insufficient in quick and accurate roll control to restrain the inclination of the vehicle by restoring its own torsional restoring force or return the inclined body to stabilize it.

In order to solve this problem, an oil shock absorber in which a steering damper is installed at one end of a stabilizer bar has been developed. An oil shock absorber is an oil shock absorber that is filled with oil without gas injection.

FIG. 1 is a sectional view showing a conventional oil shock absorber, and FIG. 2 is an enlarged view of the essential part of FIG.

1 and 2, a conventional oil shock absorber 10 includes a cylinder 11, a piston rod 12 reciprocating linearly in the cylinder 11, A rod guide 13 for stably guiding the reciprocating linear movement of the piston rod 12 in a coupled state and a rod guide 13 for connecting the inside of the cylinder 11 to the compression chamber 14 A piston valve 16 for dividing the piston 11 into a tension chamber 15 and a tension chamber 15 and a base valve 17 having a volume compensating function in a state of being coupled to an end of the cylinder 11.

In the conventional oil shock absorber, the cylinder 11 is composed of the outer cylinder 18 and the inner cylinder 19 having different lengths and diameters. A storage chamber 20 is provided between the outer cylinder 18 and the inner cylinder 19. The compression chamber 14, the tension chamber 15 and the storage chamber 20 are filled with working fluid.

The rod guide 13 is fitted and coupled between the outer cylinder 18 and the inner cylinder 19 of the cylinder 11 and a through hole 13a through which the piston rod 12 is inserted is formed at the center. An oil discharge hole 13c for discharging oil from the storage chamber 20 is formed in the rod guide 13.

A Teflon bushing 23 is tightly fitted and coupled to the lower inner peripheral surface of the through hole 13a formed in the center of the rod guide 13. An oil seal 24 Is covered with the cover 25 to which the cover 25 is attached.

A separate O-ring (O-ring) 27 is installed at a predetermined position outside the upper portion of the rod guide 22.

The piston valve 16 is fitted in the inner cylinder 19 of the cylinder 11 and a through hole 16a is formed at the center of the cylinder 11 to receive the end of the piston rod 12.

A first oil passage 29 and a second oil passage 30 are formed in the piston valve 16 so as to allow the compression chamber 14 and the tension chamber 15 to communicate with each other.

A piston rebound disc 32 having an oil discharge hole 31 formed at a position coincident with the first oil passage 29 is concentrically fitted to one surface of the piston valve 16.

A plurality of piston compression discs (35) for controlling the opening and closing states of the first oil passages (29) are fitted and coupled to the other surface of the piston valve (16).

A piston band 40 made of a material having superior wear resistance is attached to the outer circumferential surface of the piston valve 16 in order to maintain airtightness during compression and tensile strokes.

The base valve 17 is fitted to the end of the inner cylinder 19 of the cylinder 11 and has a through hole 17a of a predetermined size at its center.

A third oil passage 42 and a fourth oil passage 43 are formed in the base valve 17 to communicate the compression chamber 14 and the storage chamber 20 with each other. A base rebound disc 44 having an oil discharge hole 31 formed at a position coincident with the third oil passage 42 is concentrically fitted to one surface of the base valve 17.

A constant flow control disc 45 is provided on the other surface of the base valve 41 to control the opening and closing states of the third oil passage 42. The constant flow control disc 45 has elasticity A plurality of compression discs 46 functioning in a stacked manner are sequentially stacked by the bolts 47.

The operation state of the conventional oil shock absorber 10 constructed as described above at the time of compression and tension stroke will be described below.

When the piston rod 12 and the piston valve 16 are gradually moved to the right in the compression stroke of the shock absorber, the pressure in the compression chamber 14 gradually increases.

When the pressure in the compression chamber 14 is increased as described above, one portion of the piston rebound disc 32, which is engaged with one surface of the piston valve 16 and blocks the second oil passage 30, The two oil passages 30 are opened and one portion of the compression disk 46 and the constant flow rate regulating disk 45 which is coupled to the bottom surface of the base valve 17 and blocks the third oil passage 42 is gradually increased The working fluid (oil) in the compression chamber 14 is simultaneously discharged to the tension chamber 15 and the storage chamber 20, which are relatively low in pressure, as the third oil passage 42 is opened while being pushed by the pressure.

At this time, the first oil passage 29 of the piston valve 16 is kept closed as the compression disk 35 is closely contacted with the fourth oil passage 43 of the base valve 17, (44).

On the other hand, when the piston rod 12 and the piston valve 28 are gradually moved to the left in the tensioning stroke of the shock absorber 10, the pressure in the tension chamber 15 gradually increases as opposed to the compression stroke.

When the pressure of the tension chamber 15 is increased as described above, one of the compression discs 35, which is coupled to the piston valve 28 and blocks the first oil passage 29, is elastically turned to the right, (29) is opened so that the working fluid in the tension chamber (15) is pushed into the compression chamber (14).

At the same time, one portion of the base rebound disc 44, which is engaged with the upper surface of the base valve 41 and blocks the fourth oil passage 43, is elastically turned to the left to open the fourth oil passage 43 The working fluid corresponding to the volume change rate difference between the compression chamber 14 and the tension chamber 15 flows into the compression chamber 14 from the storage chamber 20.

At this time, the second oil passage 30 of the piston valve 16 is maintained in a closed state by tightly fitting the piston rebound disc 32, and the third oil passage 42 on the base valve 17 is closed (46).

The compression stroke and the tensile stroke of the conventional oil shock absorber 10 are repeatedly and continuously performed during the steering operation to attenuate the applied impact force.

However, in the conventional oil shock absorber configured in this way, the oil is filled in the storage chamber as well as the tension chamber and the compression chamber, and the reaction force is low in comparison with the gas injection shock absorber, so that cavitation bubbles are relatively frequently generated. There is a serious problem that the negative pressure inside the cylinder is generated to cause a damping lag and deteriorate the performance of the oil shock absorber.

Korean Patent Publication No. 2003-0067327 Korean Publication No. 2008-0028056

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a shock absorber which is capable of quickly discharging a cavitation bubble generated in a tensile and compression stroke through a gas- And to provide an oil shock absorber capable of improving performance.

In order to achieve the above-mentioned object, the present invention provides a piston comprising: a cylinder made of an outer cylinder and an inner cylinder having different lengths and diameters; a piston rod linearly reciprocating in the inner cylinder; A piston valve for separating the inside of the inner cylinder into a compression chamber and a compression chamber in a state of being coupled to an end of the piston rod; Wherein the compression chamber, the tension chamber, and the storage chamber are oil shock absorbers filled with a working fluid, the oil shock shock absorber comprising a base valve that functions as a working fluid in the compression chamber, In order to discharge the generated cavitation bubbles into the storage chamber, An outlet passage is formed.

The rod guide is coupled between the inner passage and the outer tube, and the gas discharge passage is formed to pass through the upper end portion of the position adjacent to the tension chamber.

An oil discharge hole for discharging oil in the storage chamber is formed in the rod guide, and the hollow foam generated in the inner tube is discharged to the storage chamber through the oil discharge hole after passing through the gas discharge passage.

The gas discharge passage may be inclined upward.

The gas discharge passage may be elongated leftward in the tension chamber, bent upward 90 degrees upward, and then bent rightward to be connected to the storage chamber.

The rod guide is formed with a through hole through which the piston rod is inserted in a center portion. A bushing made of Teflon is coupled to the inner circumferential surface of the through hole, and an oil seal is coupled to the upper portion of the through hole. The cover can be covered.

As described above, cavitation bubbles can be generated in the inner cylinder of the cylinder in the tensioning and compression stroke of the shock absorber. According to the present invention, after the cavitation bubble generated in the inner cylinder of the cylinder passes through the gas discharge passage formed in the rod guide By discharging to the storage chamber through the oil discharge hole, the negative pressure inside the cylinder is reduced to reduce the occurrence of the damping delay in the operation of the shock absorber, thereby improving the shock absorber performance.

1 is a sectional view showing a conventional oil shock absorber
Fig. 2 is an enlarged view
3 is a cross-sectional view showing an oil shock absorber according to a first embodiment of the present invention
4 is a cross-sectional view showing an oil shock absorber according to a second embodiment of the present invention
5 is a sectional view showing an oil shock absorber according to a third embodiment of the present invention

Hereinafter, an oil shock absorber according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification. Throughout the specification, when an element is referred to as "including" an element, it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

The present invention relates to an oil shock absorber in which oil is filled in a compression chamber, a tension chamber, and a storage chamber of a cylinder as a working fluid. The oil shock shock absorber is provided with a gas discharge passage in the rod guide for discharging cavitation bubbles generated in the compression chamber, .

Hereinafter, an oil shock absorber according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view showing an oil shock absorber according to a first embodiment of the present invention.

3, the oil shock absorber 100 according to the first embodiment of the present invention includes a cylinder 111 including an outer cylinder 118 and an inner cylinder 119 having different lengths and diameters, a cylinder 111 including the inner cylinder 119 A rod guide 113 guiding the reciprocating linear movement of the piston rod 112 in a state of being coupled to the inside of the upper end of the cylinder 111, A piston valve 116 coupled to an end of the inner cylinder 119 to divide the inside of the inner cylinder 119 into a compression chamber 114 and a tension chamber 115, And a base valve 117 which performs a volume compensation function in a state where the valve is in a state of being opened.

A storage chamber 120 is provided between the outer cylinder 118 and the inner cylinder 119. The compression chamber 114, the tension chamber 115 and the storage chamber 120 are filled with working fluid.

The rod guide 113 is coupled between the outer cylinder 118 of the cylinder 111 and the inner cylinder 119 and has a through hole 113a through which the piston rod 112 is inserted.

A bushing 123 made of Teflon is tightly fitted and coupled to the lower inner circumferential surface of the through hole 113a formed at the center of the rod guide 113. An oil seal 124 is provided above the through hole 113a, The cover 125 is coupled.

A separate O-ring (O-ring) 127 is installed at a predetermined position outside the upper portion of the rod guide 122.

The piston valve 116 is fitted in the inner cylinder 119 of the cylinder 111 and a through hole 116a is formed at the center of the cylinder 111 to receive the end of the piston rod 112.

A first oil passage 129 and a second oil passage 130 are formed in the piston valve 116 to communicate the compression chamber 114 and the tension chamber 115 with each other.

A piston rebound disc 132 having an oil discharge hole 131 formed at a position coincident with the first oil passage 129 is inserted into one surface of the piston valve 116 in a concentric manner.

A plurality of piston compression discs (135) for controlling the opening and closing states of the first oil passage (129) are fitted and coupled to the other surface of the piston valve (116).

A piston band 140 made of a material having superior wear resistance is attached to the outer peripheral surface of the piston valve 116 to maintain airtightness during compression and tensioning.

The base valve 117 is fitted to the end of the inner cylinder 119 of the cylinder 111 and has a through hole 117a of a predetermined size at its center.

A third oil passage 142 and a fourth oil passage 143 are formed in the base valve 117 to communicate the compression chamber 114 and the storage chamber 120 with each other.

A base rebound disk 144 having an oil discharge hole 131 at a position coincident with the third oil passage 142 is concentrically fitted to one surface of the base valve 117.

A constant flow control disk 145 controls the opening and closing of the third oil passage 142 on the other surface of the base valve 117. The constant flow control disk 145 has elasticity A plurality of compression discs 146 functioning in combination are sequentially stacked by bolts 147 in a stacked state.

A gas discharge passage 113b is formed in the rod guide 113 to discharge cavitation bubbles generated in the inner cylinder 119 of the cylinder 111 during the tensioning and compression stroke to the storage chamber 120 .

The rod guide 113 is coupled between the inner cylinder 119 and the outer cylinder 118 and the gas discharge passage 113b is formed to penetrate through the upper end of the position adjacent to the tension chamber 115 .

An oil discharge hole 113c for discharging oil from the storage chamber 120 is formed in the rod guide 113 and a hollow bubble generated in the inner cylinder 119 of the cylinder 111 flows into the gas discharge passage 113b, And then discharged to the storage chamber 120 through the oil discharge hole 113c.

The operation of the oil shock absorber 100 during the compression stroke and the tension stroke will now be described.

When the piston rod 112 and the piston valve 116 are gradually moved to the right in the compression stroke of the shock absorber, the pressure in the compression chamber 114 gradually increases.

When the pressure in the compression chamber 114 is increased, one portion of the piston rebound disc 132, which is coupled to one surface of the piston valve 116 and blocks the second oil passage 130, is elastically bent The two oil passages 130 are opened and one portion of the compression disk 146 and the constant flow rate regulating disk 145 which is coupled to the bottom surface of the base valve 141 and blocks the third oil passage 142 is gradually increased The working fluid (oil) in the compression chamber 114 is simultaneously discharged toward the tension chamber 115 and the storage chamber 120, which are relatively low in pressure, as the third oil passage 142 is opened.

At this time, the first oil passage 129 of the piston valve 116 is kept closed as the compression disk 135 is closely contacted with the fourth oil passage 143 of the base valve 141, (144).

On the other hand, when the piston rod 112 and the piston valve 128 are gradually moved to the left in the tensioning stroke of the shock absorber 110, the pressure in the tension chamber 115 gradually increases as opposed to the compression stroke.

As the pressure of the tension chamber 115 increases, one end of the compression disc 135, which is coupled to the piston valve 128 and blocks the first oil passage 129, is elastically turned to the right, (129) is opened to allow the working fluid in the tension chamber (115) to be pushed into the compression chamber (114).

At the same time, one portion of the base rebound disc 144, which is engaged with the upper surface of the base valve 141 and blocks the fourth oil passage 143, is elastically turned to the left to open the fourth oil passage 143 The working fluid corresponding to the volume change rate difference between the compression chamber 114 and the tension chamber 115 flows into the compression chamber 114 from the storage chamber 120.

The second oil passage 130 of the piston valve 116 is kept closed by the piston rebound disc 132 being closely attached thereto and the third oil passage 142 on the base valve 141 is closed by the compression disc (146).

The compression stroke and the tensile stroke of the oil shock absorber 100 of the present invention are repeatedly and continuously performed during the steering operation to attenuate the applied impact force.

In the first embodiment of the present invention, cavitation bubbles generated inside the inner cylinder 119 of the cylinder 111 are discharged from the gas discharge passage 100 in the compression chamber of the cylinder 100 in the tension and compression stroke of the shock absorber 100, And then discharged to the storage chamber 120 through the oil discharge hole 113c after passing through the oil discharge hole 113c. As a result, the negative pressure of the cylinder is reduced to reduce the occurrence of the damping delay in operation of the shock absorber, thereby improving the shock absorber performance.

4 is a cross-sectional view illustrating an oil shock absorber according to a second embodiment of the present invention.

Referring to FIG. 4, the oil shock absorber 200 according to the second embodiment of the present invention is provided with an oil discharge hole 213c for discharging oil from the storage chamber 220 in the rod guide 213.

A gas discharge passage 213b is formed in the rod guide 213 in order to discharge the cavitation bubble generated in the inner cylinder 219 of the cylinder during the tensioning and compression stroke to the storage chamber 220. [

The rod guide 213 is coupled between the inner cylinder 219 and the outer cylinder 218 and the gas discharge passage 213b is formed to penetrate right and left from the upper end of the position adjacent to the tension chamber 215 .

An oil discharge hole 213c for discharging oil from the storage chamber 220 is formed in the rod guide 213. After the hollow foam generated in the inner cylinder 219 passes through the gas discharge passage 213b, And is discharged to the storage chamber 220 through the discharge hole 213c.

The gas discharge passage 213b is formed so as to be inclined upward, so that the hollow foam, which is lighter than the oil, is quickly discharged, thereby reducing the damping delay.

Although not shown in the drawing, it is preferable to form the inlet of the gas discharge passage 213b relatively larger than the outlet so that the hollow foam can be quickly discharged.

5 is a cross-sectional view illustrating an oil shock absorber according to a third embodiment of the present invention.

5, in the oil shock absorber 300 according to the third embodiment of the present invention, the rod guide 313 is provided with an oil discharge hole 313c for discharging the oil in the storage chamber 320. FIG.

A gas discharge passage 313b is formed in the rod guide 313 in order to discharge cavitation bubbles generated in the inner cylinder 319 to the storage chamber 320 during a tensioning and compression stroke.

The rod guide 313 is coupled between the inner cylinder 319 and the outer cylinder 318 and the gas discharge passage 313b is formed to penetrate rightward and leftward from an upper end portion of a position adjacent to the tension chamber 315 .

An oil discharge hole 313c for discharging oil from the storage chamber 320 is formed in the rod guide 313. The hollow foam generated in the inner cylinder 319 passes through the gas discharge passage 313b, And is discharged to the storage chamber 320 through the discharge hole 313c.

The gas discharge passage 313b may be formed to be long in the left side of the tension chamber, then bent upward 90 degrees, and then bent back to the right to be connected to the storage chamber.

Since the gas discharge passage 313b is formed separately from the oil discharge hole 313c, the gas discharge passage 313b is not interfered with the discharge of the hollow foam, and the discharge is smoothly effected.

As described above, cavitation bubbles can be generated in the inner cylinder of the cylinder in the tensioning and compression stroke of the shock absorber. According to the present invention, after the cavitation bubble generated in the inner cylinder of the cylinder passes through the gas discharge passage formed in the rod guide By discharging to the storage chamber through the oil discharge hole, the negative pressure of the cylinder is reduced, so that the occurrence of the damping delay during the operation of the shock absorber can be reduced to improve the shock absorber performance.

100: Oil shock absorber
111: Cylinder
112: Piston rod
113: Road Guide
113a: Through hole
113b: gas discharge passage
113c: Oil drain hole
114: compression chamber
115: tension room
116: Piston valve
116a: Through hole
117a: Through hole
117: Base valve
118: outer tube
119: My heart
120: Storage room
123: Bushing
124: Oil Seal
125: cover
127: O-ring
129: first oil passage
130: second oil passage
131: Oil discharge hole
132: Piston Rebound Disc
135: Piston Pressure Disc
140: Piston band
142: third oil passage
143: fourth oil passage
144: Base rebound disk
145: Constant Control Disc
146: Compressed disk
147: Bolt

Claims

A piston rod that reciprocates linearly in the inner cylinder; a rod guide that guides reciprocating linear movement of the piston rod in a state of being coupled to the inside of the upper end of the cylinder; A piston valve for separating the inner cylinder into a compression chamber and a tension chamber in a state of being coupled to an end of the piston rod and a base valve for performing a volume compensation function in a state of being coupled to an end of the inner cylinder, Wherein the compression chamber, the tension chamber, and the storage chamber are oil shock absorbers filled with working fluid,
Wherein a gas discharge passage is formed in the rod guide to discharge cavitation bubbles generated in the inner cylinder when the piston is tensioned and compressed, to the storage chamber.

The method according to claim 1,
Wherein the rod guide is coupled between the inner passage and the outer tube, and the gas discharge passage is formed to penetrate right and left from an upper end portion of a position adjacent to the tension chamber.

The method according to claim 1 or 2,
Wherein the rod guide is formed with an oil discharge hole for discharging oil in the storage chamber and the hollow foam generated in the inner cylinder is discharged to the storage chamber through the oil discharge hole after passing through the gas discharge passage. Absorber.

The method according to claim 1,
Wherein the gas discharge passage is inclined upward.

The method according to claim 1,
Wherein the gas discharge passage is elongated leftward in the tension chamber, bent upward 90 degrees upward, and then bent rightward to be connected to the storage chamber.

The method according to claim 1,
The rod guide is formed with a through hole through which the piston rod is inserted in a center portion. A bushing made of Teflon is coupled to the inner circumferential surface of the through hole, and an oil seal is coupled to the upper portion of the through hole. And the cover is covered.