KR20080097118A - Combining structure of piston and push rod for clutch master cylinder - Google Patents

Abstract

A piston and push rod integrated combination structure of clutch master cylinder is provided to reduce the manufacturing cost since the number of parts is reduced and assembling is simple. A piston and push rod(410) integrated combination structure of clutch master cylinder comprises a piston(430) which is inserted into the cylinder inside to the either before or after and flexibly is installed with the elastic body, a push rod in which one end is fixed to one side of piston. A yoke is protruded to the outside of cylinder in the other end of the push rod and connected with the clutch pedal is equipped.

Description

Combination structure of piston and push rod of clutch master cylinder {COMBINING STRUCTURE OF PISTON AND PUSH ROD FOR CLUTCH MASTER CYLINDER}

The present invention relates to a coupling structure of a piston and a push rod of a clutch master cylinder, and more particularly, a coupling structure of a piston and a push rod of a clutch master cylinder is integrally formed by screwing or forced press-fitting. In particular, the present invention relates to a coupling structure of a piston and a push rod of a clutch master cylinder that can reduce parts and reduce assembly costs.

In general, a clutch master cylinder of an automobile transmits a load to a push rod of a clutch master cylinder by the operation of a clutch pedal. This generates hydraulic pressure in the clutch master cylinder and is sequentially transferred from the clutch release cylinder to the release fork and release bearing to manipulate the clutch. The clutch operated in this way transmits the engine's rotational force to the transmission, enables smooth and vibration-free oscillation, temporarily shuts off power flow between the engine and the transmission, and protects the engine and power train from overload. It also plays many roles such as reducing engine and rotational vibrations.

The configuration of the clutch master cylinder according to the prior art is provided with a cylinder 5 having a hollow cylindrical shape, as shown in FIG. 1, and a piston 13 inserted movably along the longitudinal direction of the cylinder 5. ) Is installed. In addition, one end of the push rod 11 is fixed to one side of the piston 13 via the piston insert ring 15 and the insert piston 12, and the other end of the push rod 11 is moved out of the cylinder 5. A yoke 16 is provided that protrudes and is connected to a clutch pedal, not shown. The yoke 16 may be fastened to the push rod 11 by an insert 17 and a nut 18.

In addition, a release flow path (not shown) is formed at one side of the cylinder 5 to discharge oil pressurized by the piston, and a hydraulic supply path 14 connected to a reservoir tank (not shown) is formed at one side wall of the cylinder. Is formed.

As shown in FIGS. 2 and 3, the exploded view of the piston and the push rod is characterized in that the push rods 21, 31 have a piston insert 22, 32, an elastic washer 24, 34, and a piston insert ring 25. It can be understood that it is coupled to the pistons 23, 33 by 35. In this case, the pistons are illustrated by being divided into a piston 23 made of aluminum in FIG. 2 or a piston 33 made of plastic in FIG. 3.

At this time, the push rods 21 and 31 are designed to enter but not fall out when assembled by the directionality of the elastic washers 24 and 34. In addition, after the push rods 21 and 31 stroke the pistons 23 and 33, the piston may be restrained and returned when it returns.

In the clutch master cylinder configured as described above, when the driver operates the clutch pedal, the operating force of the clutch pedal is transmitted to the piston through the push rod, and pressurizes oil to supply the clutch release cylinder while the piston moves inside the cylinder. .

However, the coupling structure of the piston and the push rod of the clutch master cylinder according to the prior art has a problem in that a large number of parts and a long time required for assembly require a lot of manufacturing cost.

The present invention has been made to solve the above problems of the prior art, to provide an integral coupling structure of the piston and the push rod of the clutch master cylinder to reduce the assembly parts and simplify the assembly to reduce the manufacturing cost The purpose is.

The present invention for solving the above problems, in the clutch master cylinder of the vehicle, a piston which is inserted to move back and forth inside the cylinder and is elastically installed by an elastic body, a push rod having one end fixed to one side of the piston, and a push rod A clutch master cylinder having a yoke protruding outward from a cylinder and fastened to a clutch pedal at another end thereof, the piston comprising: a piston; And the insert piston to which the push rod is connected is coupled by screwing and provides a coupling structure of the piston and the push rod of the clutch master cylinder, characterized in that it is integral.

Further, in the coupling structure of the piston and the push rod of the clutch master cylinder of the present invention, the insert piston is characterized by having an anti-loosening stopper.

In addition, in the coupling structure of the piston and the push rod of the clutch master cylinder of the present invention, the piston is made of plastic, characterized in that provided with a locking projection.

Further, in the coupling structure of the piston and the push rod of the clutch master cylinder of the present invention, the push rod is made of plastic or steel.

According to the integral coupling structure of the piston and the push rod of the clutch master cylinder according to the present invention configured as described above, there is an advantage that can reduce the manufacturing cost by reducing components and simplifying the assembly.

In addition, the integral coupling structure of the piston and the push rod of the clutch master cylinder according to the present invention reduces the weight by the assembly between the plastic, there is an advantage that can avoid the risk of component damage when assembling by steel elastic washers.

Hereinafter, the integral coupling structure of the piston and the push rod of the clutch master cylinder according to the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 is a view showing an integral coupling structure of the piston and the push rod of the clutch master cylinder according to the present invention.

As shown in FIG. 4, the piston 430 and the push rod 410 of the clutch master cylinder form an integral structure by screwing. A thread 425 may be formed on an outer surface of the insert piston 420, and a thread 435 having a shape and size corresponding thereto may be formed on an inner surface of the piston 430 into which the insert piston 420 is inserted. Here, the insert piston 420 connecting the push rod 410 allows the push rod 410 and the piston 430 to form an integrated structure through screwing to the piston 430.

In addition, the insert piston 420 connecting the push rod 410 is screwed to the piston 430 can be connected to replace the forced press method. That is, instead of forming the threads 425 and 435 formed on the insert piston 420 and the piston 430 for screwing the piston 430 and the push rod 410, a plurality of projections are directed on the outer surface of the insert piston. It is provided to have, by connecting the push rod, it can be designed so as not to be removed after insertion into the piston.

Here, the insert piston 420 and the piston 430 may be formed of a plastic material, the material of the push rod 410 may be made of plastic or steel.

Figure 5a is a view showing a cross-sectional view of the integral coupling structure of the piston and the push rod of the clutch master cylinder according to the present invention.

In FIG. 5A, when the insert piston 420 connected to the push rod 410 is screwed to the piston 430, the insert piston 420 forms a structure A for preventing loosening of the coupling. The coupling stability of the piston and the push rod of the clutch master cylinder which forms an integral coupling structure can be improved.

FIG. 5B shows a part of the piston of the clutch master cylinder according to the invention of FIG. 5A.

The thread 435 provided inside the piston 430 may be screwed with the insert piston (420 shown in FIG. 5A), and the locking protrusion 437 is formed to provide an anti-loosening function.

Figure 5c is a view showing the insert piston of the clutch master cylinder according to the present invention of Figure 5a.

A thread 425 provided on one side of the insert piston 420 is externally coupled to the piston 430, and the anti-loosening stopper 427 has an anti-loosening function together with the locking protrusion (437 shown in FIG. 5B). Can be provided. That is, when the insert piston 420 is sufficiently rotated for screwing the piston 430, the release preventing stopper 427 may be engaged with the engaging protrusion (437 shown in Figure 5b) to provide a release preventing function.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is a view showing a combination of the piston and the push rod of the clutch master cylinder according to the prior art.

Figure 2 is an exploded view of the aluminum piston and the push rod of the clutch master cylinder according to the prior art.

Figure 3 is an exploded view of the plastic piston and push rod of the clutch master cylinder according to the prior art.

4 is a view showing an integral coupling structure of the piston and the push rod of the clutch master cylinder according to the present invention.

Figure 5a shows a cross-sectional view of the integral coupling structure of the piston and the push rod of the clutch master cylinder according to the present invention.

5b shows a part of the piston of the clutch master cylinder according to the invention of FIG. 5a;

5c shows the insert piston of the clutch master cylinder according to the invention of FIG. 5a;

Explanation of symbols on the main parts of the drawings

410: push rod 420: insert piston

427: loosening stopper 430: piston

437: jamming

Claims (4)

A piston is inserted into the cylinder so as to be movable back and forth and is elastically installed by an elastic body, a push rod having one end fixed to one side of the piston, and a yoke protruding out of the cylinder to the other end of the push rod to be engaged with the clutch pedal. Clutch master cylinder, piston; And The push rod is connected by screwing the insert piston to Coupling structure of the piston and the push rod of the clutch master cylinder, characterized in that the integral. The method of claim 1, The piston and push rod coupling structure of the clutch master cylinder, characterized in that the insert piston is provided with an anti-loosening stopper. The method of claim 1, The piston is a combination structure of the piston and the push rod of the clutch master cylinder, characterized in that made of plastic and having a locking projection. The method of claim 1, Push rod is a coupling structure of the piston and the push rod of the clutch master cylinder, characterized in that made of plastic or steel.

Images