KR100579061B1 - Gas-lifter for vehicle - Google Patents

Abstract

The present invention automatically replenishes gas when the cylinder pressure of the gas lifter is low in order to prevent the performance of the gas lifter due to the pressure change of the gas charged in the gas lifter, and the internal pressure is high. In this case, an object of the present invention is to provide a gas lifter capable of automatically discharging gas.

The gas lifter according to the present invention is configured such that the cylinder itself slides to the tube side after the closing operation by the second rod when the trunk lid or the hood is closed, and the closing operation of the trunk lid is completed. Check valves are installed on the second rod side to allow the gas in the cylinder to flow in an optional direction as needed, and a discharge valve is installed so that the gas can be discharged to the outside when the pressure inside is too large. Consists of the composition.

Gas lifter, ball check valve, gas leak, deterioration of operating force

Description

Gas lifter for vehicles {Gas-lifter for vehicle}

Figure 1 is a simplified diagram showing the structure of a general gas lifter used for opening and closing the trunk lid of the vehicle.

2 is a cross-sectional view showing the internal structure of a conventional gas lifter.

3 is a view showing a state immediately before the closing operation of the gas lifter of FIG. 2 is completed.

4 is a view illustrating a structure in which internal gas is self-filled according to the closing operation of the gas lifter of FIG. 3.

5 is a cross-sectional view showing the internal structure of the gas lifter according to an embodiment of the present invention.

6 is an exploded view of the gas lifter of FIG. 5.

Figure 7 is a simplified diagram showing the structure of the discharge check valve according to an embodiment of the present invention.

8 is a view illustrating a structure in which gas is discharged to the outside through a discharge check valve due to an increase in pressure of the gas inside the gas lifter of FIG. 5.

9 is a view illustrating a structure in which internal gas is self-filled according to the closing operation of the gas lifter of FIG. 5.

<Description of Symbols for Main Parts of Drawings>

10: cylinder 12: 1st separator

13: 2nd separator 14: 1st stopper

15: tube 20: first load

21: 31: piston 30: second rod

40: second stopper 41: first orifice

42: second orifice 42a: filling hole

42b: discharge hole 43: third stopper

44: connecting shaft 45: third separator

50: discharge valve 53: discharge hole

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas lifter of a vehicle, and more particularly, has a gas filling and gas discharging function of the gas lifter to prevent the gas lifter from degrading due to a change in pressure of the gas charged in the gas lifter. It relates to a gas lifter.

In general, as shown in Figure 1, the gas lifter used as the opening and closing mechanism of the hood or the trunk lid is initially good performance, but the internal gas leakage due to the continuous opening and closing operation or vehicle vibration, etc. As a result, the pressure of the internal gas is reduced, which makes it impossible to open the hood or the trunk lid by the gas lifter magnetic force. This is especially a problem when operating the gas lifter in low temperature conditions, such as winter.

On the other hand, even when the ambient temperature rises in the summer and the pressure of the internal gas increases, there is a problem in the performance of the gas lifter, that is, the hood or the trunk lid opens too soon during the opening operation, Pressing external force is too large.

Applicant has proposed a gas lifter having a self-filling function as part of solving the problems of the gas lifter, which is shown in Figures 2 to 4. However, it is to be clarified that this gas lifter is not known before the present application.

As can be seen in Figures 1 and 2, the gas lifter has a structure in which the rods 20, 30 provided with the pistons 21, 31 at the front end are inserted at both ends of the hollow cylinder 10. At this time, the internal gas is filled between the two pistons 21 and 31, the tube 15 is coupled to the right end of the cylinder 10, the cylinder is coupled to the structure that can slide into the tube, the tube and the cylinder to each other Stoppers 32 and 33 having an interference (or stop) function with respect to the separating direction are provided. These stoppers allow the cylinder to slide inside the tube 15 but are not completely separated from the tube.

The first rod 20 on the left side fixed to the hood or the trunk lid reciprocates in the cylinder 10 filled with the internal gas to open and close the hood or the trunk lid, and the second rod 30 on the right side One end is supported by the tube 15 coupled to the right end of the cylinder to elastically support the return spring 11 inside the cylinder 10 and to enable gas filling into the cylinder.

In front of the return spring 11, the first separator 12 and the second separator 13 are fixed to the inner wall of the cylinder, and each of these separators is a ball check valve operated by the pressure difference of the gas in the cylinder. The structure is prepared. In front of the second isolation plate 13, a first stopper 14 having a hole in the center thereof is firmly fixed to the inner wall of the cylinder.

A ball (and spring) that is elastically supported by the second separator 13 to seal the hole formed in the center portion of the first separator 12 and elastically supported by the first stopper 14 to be the second separator 13 The two ball check valves, which consist of two balls (and springs) that seal the holes formed in the upper and lower portions of the cylinder, allow the gas to pass selectively from the right side of the cylinder to the left side, thereby allowing the piston of the second rod ( 31 are separated from the first separator 12, between the first separator 12 and the second separator 13, between the second separator 13 and the piston 21 of the first rod, respectively. The first, second and third chambers are formed. Of course, each chamber is filled with internal gas.

3 and 4, when the trunk lid is closed, the first rod 20 connected to one side of the inner side of the trunk lid moves deep into the right side of the cylinder and compresses the internal gas. Just before it is completely closed, the piston 21 of the first rod is in contact with the first stopper 14 and presses the first stopper 14 upon completion of the closing operation of the trunk lid so that the cylinder 10 itself becomes a tube 15. Make it slide inwards. At this time, the return spring 11 is compressed as much as the movement amount of the cylinder 10, and the compressed gas in the first chamber of the ball check valve is installed in front of the first separator 12 and the second separator 13. The pressure is supplied to the second chamber and the third chamber. The first chamber may be provided with a structure for allowing gas to be supplied from the outside.

As such, when the return spring 11 is compressed during the closing operation of the trunk lid, the gas lifter instantly supplies the gas in the first chamber to the second chamber, and maintains a high pressure state by the action of the return spring 11. The gas of the second chamber is configured to enter the third chamber lower than the reference pressure to automatically replenish the insufficient gas.

And since the cylinder 10 itself slides inside the tube 15 after the sliding of the first rod 20 in the cylinder 10 is completed, as shown in FIG. 4, the hood or the trunk lid is completely In the state in which the closing operation of the gas lifter is completely closed, the stoppers 32 and 33 respectively provided in the cylinder and the tube are separated from each other (unlike in FIG. 3).

On the other hand, when the trunk lid is opened, the cylinder 10 is first returned to its original state by the elastic force of the return spring 11, and then the first rod 20 is opened by the compressed air in the third chamber. do.

The gas lifter having such a structure solves the problem of deterioration of the operating force of the gas lifter due to the leakage of internal gas, but there is no countermeasure against the problem caused by the excessive gas pressure in the third chamber.

The present invention has been proposed to solve the above problems, and when the internal pressure of the gas lifter is low, the gas is automatically replenished, and when the internal pressure is high, the gas lifter can be automatically discharged. The purpose.

Gas lifter according to the present invention for achieving the above object, in the gas lifter having its own gas filling structure on the second rod side as in the prior art, interference with the piston of the first rod before the closing operation of the trunk lid occurs A second stopper having a structure fixed to the piston front side of the first rod so that the cylinder can be slid into the tube by the first rod and having a bidirectional gas movement; A third stopper fixedly installed in front of the second stopper; A member configured to be slidably integrally in a cylinder via a connecting shaft passing through the third stopper, the first orifice installed behind the third stopper and capable of bidirectional gas movement, and the first orifice installed in front of the third stopper. A moving body including a filling hole opened and closed by a ball elastically supported at the second hole, and a second orifice having a discharge hole capable of moving in two directions, which is closed in close contact with the third stopper; A third isolating plate fixedly installed in front of the second orifice so as to elastically support the second orifice so that the second orifice is in close contact with the third stopper via a spring, and have a bidirectional gas movement; And a discharge valve installed between the third isolation plate and the one-way valve structure on the second rod side to discharge the gas to the outside due to the pressure difference when the internal gas pressure is greater than the predetermined pressure. .

The discharge hole formed in the movable body slidably installed in the cylinder may be opened or closed in accordance with the sliding of the movable body. When the movable body moves according to the pressure difference to open the discharge hole, the gas on the first rod side moves to the second rod side. Can be. In this case, gas movement from the second rod side to the first rod side may be possible, but the movement of the movable body to the second rod side is caused by the large gas pressure on the first rod side. Only one-way gas flow to the side appears.
The filling hole formed in the second orifice, together with the ball and the spring, constitutes a check valve that selectively moves the gas from the second rod side to the first rod side due to the pressure difference of the gas.

In the present description, the directions in which the pistons of the first rod and the second rod compress the cylinders are forwards, and the directions of expansion are rearwards, respectively, based on the discharge valve. That is, the piston front side of each of the 1st rod and the 2nd rod becomes a front direction.

The 'closing action' referred to in this description means a process in which the trunk lid is closed to a process in which the first rod is slid into the cylinder.

Hereinafter, with reference to the accompanying drawings looks at with respect to the gas gutters of the vehicle according to an embodiment of the present invention. Unless otherwise specified, the same names refer to the same or equivalent members, and the same reference numerals are used for members having the same structure as the members described in the prior art.

As can be seen in Figure 5, the gas lifter according to the present embodiment has the gas filling structure of the gas lifter as described in the prior art as it is, in addition to the increase in the internal pressure of the gas automatically It has a gas discharge structure that allows the gas to be discharged to the outside. The description of the conventional gas filling structure is omitted so that the description does not overlap.

The automatic gas discharge structure is fixedly installed in front of the piston 21 of the first rod 20 and interferes with the piston 21 of the first rod when the closing operation of the gas lifter is completed. A second stopper 40 to allow the slide 10 to slide toward the tube 15 side, and check valves 41 to 45 installed in front of the second stopper to allow the gas in the cylinder to selectively pass (bidirectionally pass). And a discharge valve 50 provided between the check valve and the first stopper 14 to automatically discharge the gas inside the cylinder to the outside.

As can be seen in Figures 5 and 6, the second stopper 40 is formed in the form of a ring with a hole in the center, and is firmly fixed to the inner wall of the cylinder when the piston 21 of the second rod when the closing operation of the gas lifter is completed. )). The function of this second stopper 40 is the same as that of the first stopper 14 which has been described in the prior art description.

The check valves 41 to 45 are slidably installed in front of the second stopper 40 and have a disk-shaped first orifice 41 formed with two holes up and down, and a connecting shaft in front of the first orifice. A second orifice 42 having a disc shape, which is connected by means of 44 and moves integrally with the first orifice and has two holes at the bottom and two holes at the top thereof, and is fixedly installed at the front of the second orifice, A third separator 45 having a hole and a ring-shaped third stopper 43 are provided between the first orifice 41 and the second orifice 42 and have a hole in the center thereof.

Then, between the first orifice 41 and the second orifice 42 whose central portion is connected by the connecting shaft 44, two sealing holes 42a formed near the center of the second orifice 42 are sealed. A ball check valve structure is provided, which is configured to elastically support two balls. At this time, one side of the spring is supported by the first orifice 41, the other side passes through the central hole of the third stopper 43 to support the ball.

The third stopper 43 is in close contact with the rear surface of the second orifice 42 to seal the two discharge holes (42b) formed outside the filling hole of the second orifice, the first orifice (or second orifice) is a cylinder Since it can slide according to the gas pressure difference within, the discharge hole 42b is sealed or opened according to the sliding operation of the first orifice (or the second orifice).

Between the second orifice 42 and the third separator 45, two springs are provided on the upper and lower sides to elastically support the second orifice 42 which moves left and right.

As can be seen in Figures 5 and 7, the discharge valve 50 is made of a structure in which the ball is elastically supported by the spring to seal the discharge hole 53 formed on one side of the outer peripheral surface of the cylinder 10, the spring of Elastic force is achieved through adjusting the screwing state between the case 51 and the cap 52 for receiving the ball and the spring. A discharge port 54 penetrating the cap 52 up and down is formed under the spring.

This gas lifter is provided between the piston 31 of the first rod and the first separator 12, between the first separator 12 and the second separator 13, the second separator 13 and the second separator. It can be said that between the orifices 42 and between the second orifice 42 and the piston 21 of the second rod form each of the independent first, second, third and fourth chambers.

An operation example of the gas lifter will be described with reference to FIGS. 6 to 9.

As shown in FIG. 8, when the gas pressure of the fourth chamber is increased due to the high temperature around summer, the high pressure gas in the fourth chamber pressurizes the second orifice 42 so that the second orifice 42 is moved forward. To overcome the elastic force of the spring installed in the third to be separated to the isolation plate 45. As a result, the state of close contact between the second orifice 42 and the third stopper 43 is no longer maintained, and gas is introduced into the third chamber through the discharge hole 42b that is closed by the third stopper 43. Will move. When the pressure of the gas collected into the third chamber is greater than the spring elastic force of the discharge valve 50, the gas pushes the ball and is automatically discharged to the outside through the discharge hole 53 and the discharge port 54.

As shown in FIG. 9, when the gas lifter is closed, the first rod 20 connected to one side of the inner side of the hood or the trunk lid moves to the right side of the cylinder and compresses the gas in the fourth chamber. Just before it is completely closed, the piston 21 of the second rod is in contact with the second stopper 40 and presses the second stopper 40 upon completion of the closing operation so that the cylinder 10 itself slides into the tube 15. do. At this time, the return spring 11 is compressed by the amount of movement of the cylinder 10, and the gas in the first chamber is compressed and supplied to the second chamber by the piston of the first rod. In this way, the gas supplied into the second chamber is stored until the high pressure is reached, and when the gas pressure in the fourth chamber is equal to or less than the reference pressure, between the first orifice 41 and the second orifice 42. The spring force of the installed ball check valve is overcome and replenished into the fourth chamber via the third chamber.

According to the gas lifter having the structure as described above, the gas can be automatically charged or discharged according to the pressure variation in the fourth chamber, so that the operating force of the gas lifter can be kept constant at all times.

Claims (1)

At the ends of the cylinder 10, the first rod 20 and the second rod 30, and the second rod 30 side cylinder 10, which are installed at both ends of the cylinder in a direction facing each other. A tube 15 installed to fix the rear end of the second rod 30 and to allow the cylinder 10 to slide inward, a return spring 11 installed in front of the piston 31 of the second rod, and a return spring (11) When the cylinder 10 is installed in front and the cylinder 10 slides into the tube 15, the gas flows from the return spring 11 side to the first rod 20 according to the increase in pressure in the space where the return spring 11 is installed. In a gas lifter having one-way valves (12, 13, 14) to selectively pass only Before completion of the closing operation of the trunk lid, interference with the piston 21 of the first rod is generated so that the cylinder 10 may slide into the tube 15 by the first rod 20 so that the piston 21 of the first rod is closed. A second stopper 40 fixed to the front side and configured to allow bidirectional gas movement; A third stopper 43 fixedly installed in front of the second stopper 40; A member configured to be integrally slidable in the cylinder 10 via the connecting shaft 44 penetrating through the third stopper 43, and is installed behind the third stopper 43 and capable of bidirectional gas movement. It is installed in front of the orifice 41 and the third stopper 43, but closed in close contact with the filling hole 42a and the third stopper 43, which are opened and closed by a ball that is elastically supported by the first orifice 41. A movable body having a second orifice 42 having a discharge hole 42b capable of bidirectional gas movement; It is fixed to the front of the second orifice 42 to elastically support the second orifice 42 so that the second orifice 42 can be in close contact with the third stopper 43 via a spring structure, the structure capable of bidirectional gas movement The third isolation plate 45; Installed between the third isolation plate 45 and the one-way valves 12, 13, and 14 on the second rod 30 side, the gas is discharged to the outside due to the pressure difference when the internal gas pressure is larger than the predetermined pressure. A gas lifter comprising a; discharge valve (50) to be.

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