KR100320103B1 - seling device of clutch master cylinder - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device of a clutch master cylinder installed between a clutch pedal and a clutch assembly to block power transmitted to a wheel through a clutch with a small force. By improving the internal pressure of the main body above the set value, the main body is able to withstand the pressure sufficiently and at the same time to produce the clutch master cylinder at a lower price.

To this end, in the through-hole through the reservoir tank is formed in the main body 1, a closing surface 14 extending to the connection surface of the valve plate 6 is formed in the liner inserted in the injection molding of the main body to form the liner ( 13 is in the shape of a cup, and the closing surface 14 has a through hole 4 formed therein.

Description

Sealing device of clutch master cylinder

The present invention relates to a clutch master cylinder installed between a clutch pedal and a clutch assembly to cut off power transmitted to a wheel through a clutch with a small force. More specifically, the clutch pedal of the clutch pedal is pressed. The present invention relates to a sealing device of a clutch master cylinder that allows the hydraulic pressure in the clutch master cylinder to be maintained at a set value and prevents oil in the clutch master cylinder from leaking into the gap between the main body and the liner.

In general, the clutch master cylinder made of a synthetic resin material is the same as that of FIG. 1, and the inner surface of the cylinder in which the piston 2 reciprocates must maintain a certain precision or higher to form a predetermined hydraulic pressure when the clutch pedal is pressed. In the injection molding of 1), the liner 3 which is a metal material is inserted.

In addition, a valve stopper 5 is formed in the main body 1 and positioned in the liner 3 in the through-hole 4 through the reservoir tank (not shown), and has a cutout portion 5a on the outer circumferential surface thereof. In the valve stopper, a valve plate 6 is elastically installed with a spring 7.

On the other hand, the other side of the valve plate 6 is fitted to the fastening ring 9 coupled to the piston rod 8 through the center of the valve stopper 5 and maintains airtightness on the outer circumferential surface of the piston rod A piston 2 for compressing oil in (3) is inserted and at the same time, the other end of the piston rod 8 is connected to a clutch rod 10 connected to a clutch pedal, and between the valve stopper and the piston rod 8. The spring 11 is installed to be compressed.

The clutch master should be set larger than the elastic modulus of the spring 7 provided between the valve stopper 5 and the piston rod 8 than the spring 7 provided between the valve plate 6 and the valve stopper 5. The cylinder is activated.

That is, in the initial state, as shown in FIG. 1A, the force to be restored by the compression of the spring 11 is greater than the elastic modulus of the spring 7 provided between the valve plate 6 and the valve stopper 5 to open the through hole 4. Only if it is allowed to operate.

In this state, when the driver starts to step on the clutch pedal to cut off the transmission of the clutch (not shown) for the purpose of gear shifting, the force is transmitted through the clutch rod 10 and the piston in which the piston 2 is engaged. Since the rod 8 is pushed, the piston rod 8 is advanced by 'S' in FIG. 1A while compressing the spring 11.

Accordingly, the valve plate 6 pulled toward the fastening ring 9 is moved to the left side of the drawing while restoring another spring 7 which has been compressed smaller than the elastic modulus of the spring 11 to open the through hole 4. Since it is closed, the state as shown in Figure 1b.

In this way, when the driver presses the clutch pedal further while the valve plate 6 closes the through hole 4 to block the oil supply in the reservoir tank, the piston rod 8 pushes the piston rod 8 through the clutch rod 10. (2) compresses the oil in the liner (3), thereby actuating the clutch assembly due to the pressure increase due to the compression of the oil to block the transmission of power to the wheel side. Is done continuously)

However, such a conventional apparatus inserts a liner 3 of metal and inserts the main body 1 into a synthetic resin, so that there is no chemical affinity between the metal and the synthetic resin, so that a fine gap is generated between the interfaces thereof. 3) there is a problem that the oil compressed in the leakage to the inlet side of the main body 1 through the interface between the liner and the main body (1).

Therefore, in order to improve the above problems, the apparatus as shown in FIG. 2 has been developed and applied.

Looking at the structure, at least one groove 3a is formed on the outer circumferential surface of the liner 3 inserted into the main body 1 so that an injection molded product is filled in the groove 3a in the state where the liner is inserted. It acts as a dam of oil leaking through the interface between the main body 1 and the liner 3.

Another embodiment of this structure was able to solve the problem of the oil leakage occurs in the interface between the liner 3 and the main body 1 generated in one embodiment, the following other problems have occurred.

First, since the main body 1 is injection-molded with a synthetic resin material, the roughness (Rmax 7.6 to 10.8s) and the plan view (40 to 60μ) of the connection surface 12 close to the through hole 4 due to the valve plate 6 being in close contact with each other. If the driver presses the clutch pedal for gear shifting, the oil leaks to the reservoir tank side. Therefore, the pressure in the liner 3 becomes less than the set value, and the power transmitted to the clutch is lost. Since it could not be blocked, gear shifting could not be performed smoothly.

Second, although the pressure is applied in the axial direction in the main body 1 during the pressing operation of the clutch pedal, the connection surface 12 of the valve plate 6 that withstands the pressure is made of resin, and thus the strength to withstand internal pressure is weak.

Therefore, when the thickness of the valve plate 6 is designed to be thick enough to withstand the internal pressure, the first problem is further exacerbated because deformation such as shrinkage occurs in the connection surface of the valve plate 6 during injection.

Third, since the liner 3 inserted into the main body 1 forms the groove 3a on the outer circumferential surface by a separate grinding operation after the drawing operation, the production cost increases.

The present invention has been made to solve such a problem in the prior art, the structure of the liner to improve the structure of the body even if the internal pressure of the main body to maintain the pressure higher than the set value while at the same time the clutch master cylinder at a lower price Its purpose is to enable production.

According to an aspect of the present invention for achieving the above object, in the through-hole through the reservoir tank is formed in the main body, a closing surface extending to the connection surface of the valve plate is formed in the liner inserted during the injection molding of the main body is formed The sealing device of the clutch master cylinder is characterized in that the approximately cup-shaped and the closed surface is formed through holes.

1A and 1B are longitudinal cross-sectional views showing a conventional apparatus,

Figure 1a is an initial state without pressing the clutch pedal

1B is a state in which the valve plate closes the through hole by stepping on the clutch pedal

Figure 2 is a longitudinal sectional view showing another embodiment of the conventional device

3A and 3B are longitudinal sectional views showing the first embodiment of the present invention.

4A and 4B are longitudinal cross-sectional views showing a second embodiment of the present invention;

5 is a longitudinal sectional view showing a third embodiment of the present invention;

6 is a longitudinal sectional view showing a fourth embodiment of the present invention;

Figures 7a and 7b is a partial longitudinal cross-sectional view of the clutch master cylinder for explaining the operation of the present invention

Explanation of symbols for main parts of the drawings

1: body 13: liner

14: closed surface 15: concave surface

16: convex surface 17: extension part

18: flange

Hereinafter, the present invention will be described in more detail with reference to FIGS. 3 to 7.

In the configuration of the present invention, the same parts as in the conventional configuration will be omitted and the same reference numerals will be given.

3A and 3B are longitudinal cross-sectional views showing a first embodiment of the present invention, in which a closed surface extending to the connection surface of the valve plate 6 to a liner 13 inserted during injection molding of the main body 1 is shown. 14 is formed so that the liner 13 is formed in a substantially cup shape, and the closing surface 14 has a through hole 4 through the reservoir tank.

Therefore, the roughness and the flatness of the closed surface 14 can be precisely maintained.

4A and 4B are longitudinal cross-sectional views showing a second embodiment of the present invention, in which the concave surface 15 is formed or the convex surface 16 is formed on the closed surface 14 to which the valve plate 6 is connected. It is formed to be bent in two stages.

This is enough to withstand the internal pressure by the shape of the closing surface 14 even if the pressure in the liner 13 is acted in the axial direction according to the movement of the piston 2 while minimizing the thickness of the portion where the through hole 4 is formed. To do so.

5 and 6 are longitudinal cross-sectional views showing the third and fourth embodiments of the present invention, in which an extended portion 17 is formed on the closed surface 14 to which the valve plate 6 is connected, and an extension portion from the closed surface ( The through hole 4 is formed over the 17, or the flange 18 is formed on the inlet side of the liner 13.

In the case of the third and fourth embodiments, even if the main body 1 is injection molded while the liner 13 is inserted, the adhesion between the main body 1 and the liner 13 can be further increased than the first and second embodiments. do.

Since the liner 13 shown in each embodiment of the present invention described above is molded by deep drawing, the roughness (Rmax 2.3s or less) and the top view (18μ) of the closing surface 14 to which the valve plate 6 is connected Can be further improved.

In addition, at least one groove 13a may be formed on the outer circumferential surface of the liner 13 as shown in FIGS. 3A, 4A, and 4B by post processing.

Each embodiment of the present invention described above is not limited to the illustrated embodiment because it is understood that it is more widely applicable by the expert.

Referring to the operation of the present invention configured as described above is as follows.

First, in the state as shown in FIG. 7A in which the driver does not step on the clutch pedal, the valve stopper 5 is moved to the right side in the drawing to the right by the elastic force of the spring 11 and is separated from the closing surface 14 so that the valve plate 6 Since the through hole 4 is kept open, the oil in the reserve tank is supplied into the liner 13.

That is, the gear is in a neutral state or a driving state is maintained.

In this state, when the driver starts to step on the clutch pedal for shifting, the force is transmitted through the clutch rod 10 to push the piston rod 8 to which the piston 2 is coupled, so that the piston rod is the valve stopper 5. And forward while compressing the spring (11) installed between the fastening ring (9).

In this way, when the spring 11 is compressed and the overall length is shortened, the spring 7 pressed between the valve plate 6 and the valve stopper 5 is restored to the initial state by the compression force of the spring. ) Is moved to the left side in the drawing close to the closing surface 14 to maintain the roughness and plan as shown in Figure 7b to close the through hole (4).

In this way, when the driver presses the clutch pedal further while the valve plate 6 closes the through hole 4 to block the oil supply in the reservoir tank, the piston rod 8 pushes the piston rod 8 through the clutch rod 10. (2) is moved to the left to compress the oil in the liner 13, and thus the increased pressure is transmitted to the clutch assembly side in accordance with the compression of the oil, so that the power transmitted to the wheel side through the clutch is cut off.

In the above-described operation, since the closed surface 14, which is the central axis direction of the liner 13 to which the pressure of the oil is applied, is a metallic material formed integrally with the liner 13, the thickness of the through hole 4 is thin. It is able to withstand the internal pressure sufficiently without increasing.

In addition, in the case of the third and fourth embodiments shown in Figs. 5 and 6, when the oil is compressed by the above-described operation to generate a pressure, the extension part 17 and the flange 18 form the main body 1 and the main body 1. It is to prevent the leakage of oil through the interface between the liner (13).

As described above, the present invention has the following advantages over the conventional apparatus.

First, the closed surface, which is the pressure acting surface of the liner 13, has a cup shape formed integrally. Since the pressure can always be maintained at the set value, the reliability of the clutch master cylinder can be greatly improved.

Second, since the liner 13 can be mass-produced by deep drawing, the clutch master cylinder can be supplied at a lower price.

Third, since the roughness and flatness of the closing surface 13 can be precisely maintained, the phenomenon in which oil in the pressure chamber leaks to the reservoir tank side is prevented when the pressure in the pressure chamber is increased by stepping on the clutch pedal.

Fourth, since the closed surface 14 to which the pressure is applied is made of a metal material integrally formed with the liner 13, it is possible to minimize the flesh thickness of the main body 1, thereby reducing the expensive resin The production cost can be reduced.

Claims (2)

In the through-hole formed through the reserve tank in the main body, The main body front part is integrally formed in a tubular shape toward the upper direction, and a closing surface extending to the connection surface of the valve plate is formed on the liner inserted during injection molding of the main body so that the overall shape of the liner forms a cup shape. An extension part is formed on the surface, and a flange is formed on the inlet side of the liner, and a through hole is formed in the center portion of the closing surface and the extension part so as to pass through the reserve tank. The method of claim 1, The closing surface is formed with a concave surface or convex surface, at least one groove is formed on the outer peripheral surface of the liner and the entire liner is molded by deep drawing, characterized in that the sealing device of the clutch master cylinder.