KR100242182B1 - Apparatus for measuring friction coefficient of piston ring - Google Patents

Abstract

Piston ring friction coefficient measuring device consisting of a lifting unit which serves as the combustion chamber to measure the friction coefficient of the piston ring and the liner using a dynamometer, and a fixed part that acts as a piston in conjunction with the lifting unit To provide.

Description

Piston Ring Friction Coefficient Measuring Device

1 is a side view showing a piston ring friction coefficient measuring apparatus according to the present invention.

Figure 2 is a schematic diagram showing a conventional piston ring friction coefficient measuring device.

* Explanation of symbols for main parts of the drawings

1: lifting part 2: fixing part

3: table 4: support

5 crank member 6 connecting member

7: plate 8: guide

9: motor 10: belt

11: piston member 12: upper fixture

13 load cell 14 meter

15 regulator 16 high pressure pipe

17: ventilator

The present invention relates to a piston ring friction coefficient measuring device, and more particularly to a piston ring friction coefficient measuring device easy to change the design.

In general, the vehicle is composed of a mechanical element, the electric element is combined to form a vehicle that can be operated, the mechanical element is composed of a chassis consisting of the engine, power transmission, suspension, steering device, and the body It is.

In the engine, parts of the vehicle which generate power substantially are classified into OHV (Vover Head Valve) type and OHC (Over Head Camshaft) type according to the installation position of the valve, and vertical, horizontal, It is distinguished by V type.

The engine includes a cylinder block having a water jacket, a piston which is inserted into a combustion chamber of the cylinder block and is connected to a crank shaft and a connecting rod, and is coupled to an upper portion of the cylinder block and has an intake and exhaust valve. It consists of installed cylinder heads.

In particular, the piston, which is the power generating part of the vehicle, is inserted into the combustion chamber formed by the cylinder block and the head to change the explosive force in the combustion chamber by rotational movement, and thus, a plurality of piston rings are combined to prevent the explosive force from leaking. .

The piston ring is divided into a compression ring for maintaining the airtight of the combustion chamber, and an oil ring that not only scrapes off the lubricating oil but also forms an oil film on the inner wall of the combustion chamber.

Of course, the liner is inserted into the combustion chamber to prevent the combustion chamber from being worn. The piston ring performs its function by reciprocating while being in close contact with the liner.

Here, the piston ring is small when the contact with the liner is small, the friction coefficient is too large, the wear is easy, if the pressure is too small, the compression effect is reduced and the lubrication action is reduced, so that the appropriate pressure, that is, the space is required.

In order to measure the above gap, the piston P inserted into the combustion chamber C of the cylinder block B in which the cylinder head (not shown) is separated as shown in FIG. 2, and the piston P described above. ) And a piston ring friction coefficient measuring device comprising a connecting rod CR connecting the crank shaft CS and the dynamometer 50 connected to the crank shaft CS.

That is, the piston ring PR and the liner coupled to the piston P by rotating the dynamometer 50 to reciprocate in the state in which the piston P is in close contact with the combustion chamber C, that is, the liner L. The torque applied to the dynamometer 50 is measured by the frictional force of (L).

Torque measured by the dynamometer 50 is converted into friction force to measure the friction coefficient of the piston ring (PR) and the liner (L) to calculate the distance between the piston ring (PR) and the liner (L) accordingly will be.

However, as described above, measuring the friction coefficient of the piston ring PR and the liner L using the dynamometer 50 requires the cylinder head of the engine itself to be separated at the time of measurement, and the friction coefficient can be adjusted to an appropriate level. If exceeded, the design change is difficult.

Accordingly, an object of the present invention is to provide a piston ring friction coefficient measuring device capable of measuring the friction coefficient of the piston ring and the liner as to solve the above problems.

In order to realize the above object, the present invention is characterized in that the piston ring friction coefficient measuring device is configured as a lifting unit which serves as a combustion chamber, and a fixed unit which serves as a piston in conjunction with the lifting unit.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a side view showing a piston ring friction coefficient measuring apparatus according to the present invention, the lifting unit (1) to serve as the combustion chamber and the piston (1) in conjunction with the lifting unit (1). It consists of a fixed part (2).

The lifting unit 1 includes a table 3, a support 4 provided above the table 3, a crank member 5 inserted into the support 4 to rotate, and A plate 7 which is connected to one crank member 5 by a connecting member 6 and moves up and down as the crank member 5 rotates, a liner L fixed to the plate 7, It consists of the guide 8 fixed to the table 3 in order to support the lifting motion of the said plate 7.

In addition, the crank member 5 is connected to the motor 9 by a belt 10 for rotation.

Of course, the connecting member 6 to the crank member 5 exhibits the same characteristics as the crank shaft CS and the connecting rod CR used in the engine.

In addition, the fixing part 2 is a piston member 11 to which the piston ring PR in close contact with the liner L is coupled, and between the piston member 11 and the upper holder 12. A load cell 13 interposed therebetween, a measuring device 14 connected to the load cell 13 and the piston member 11 which are installed to inject high pressure gas into the liner L. It consists of means.

The injection means induces a state similar to the combustion chamber of high temperature and high pressure by injecting a high pressure to the inner wall of the liner L, which is a regulator 15 for purifying a high pressure gas and a high pressure connected to the regulator 15. It consists of the pipe 16 and the ventilation hole 17 formed in the piston member 11 so that the high pressure gas supplied from the high pressure pipe 16 may be injected to the inner wall of the liner L. As shown in FIG.

When explaining the operation and effect of the present invention as described above to fix the liner (L) used for the measurement to the plate (7) and to couple the piston ring (PR) to the piston member 11 to operate the motor (9). do.

When the motor 9 is operated, the crank member 5 connected thereto by the belt 10 rotates, and the plate 7 connected by the connecting member 6 connected thereto moves up and down by the guide 8.

When the plate 7 moves up and down, the liner L fixed thereto moves up and down in close contact with the piston ring PR, and according to the friction coefficient between the liner L and the piston ring RP, the piston The pressure applied to the load cell 13 provided between the member 11 and the upper stand 12 is changed.

That is, if the distance between the piston ring PR and the liner L is too narrow, the pressure applied to the load cell 13 exceeds an appropriate value. The pressure is displayed.

At this time, the high pressure gas passing through the regulator 15 and the high pressure pipe 16 injects the high pressure gas to the inner wall of the liner L through the air vent 71 to generate a pressure to expand the liner L. It is made similar to the state of the combustion chamber (C).

As described above, when the high-pressure gas is injected onto the liner L, the liner L is slightly inflated to the outside so that the friction coefficient measurement between the liner L and the piston ring PR is more precise.

Of course, the speed of the crank member 5 is operated at the same speed as that of the normal engine.

If the friction coefficient is not appropriate after the measurement as described above to maintain the appropriate friction coefficient by adjusting the size of the piston ring (PR) or the size of the liner (L) and apply it to the engine design.

As described above, the present invention has the advantage that the design of the engine is facilitated by measuring the friction coefficient of the piston ring and the liner in the state of not assembling the engine by installing the fixing part and the lifting part similarly to the combustion chamber of the engine. .

Claims (3)

A connecting member (3), a support (4) installed on the table (3), a crank member (5) inserted into the support member (4) for rotational rotation, and a connection member (c) to the crank member (5). 6) is connected to the plate 7 to move in accordance with the rotation of the crank member (5), the liner (L) fixed to the plate (7), to support the lifting movement of the plate (7) Lifting part (1) which serves as a combustion chamber (C) consisting of a configuration including a guide (8) fixed to the table (3) and a motor (9) connected by the crank member (5) and the belt (10) And a piston member 11 having a piston ring PR in close contact with the liner L, a load cell 13 interposed between the piston member 11 and the upper stand 12, and the load cell. Comprising a measuring device (14) connected to the (13) comprises a fixing part (2) which serves as the interlocking piston (P) to the lifting part (1) Piston ring friction coefficient measuring device, characterized by constituted by any property. The piston ring friction coefficient measuring device according to claim 1, wherein the fixed part (1) comprises injection means for injecting a high pressure into the liner (L) to reproduce the state of the engine combustion chamber (C). The high pressure gas supplied from the regulator 15, the high pressure pipe 16 connected to the regulator 15, and the high pressure pipe 16 are liners. L) A piston ring friction coefficient measuring device, characterized in that consisting of a vent hole 17 formed in the piston member 11 to be injected into the inner wall.