KR19980016306A - Piston structure of engine for an automobile - Google Patents

Abstract

The present invention relates to a piston structure of an automobile engine that transmits power of a mixer combusted in a cylinder while reciprocating in a cylinder through a connecting rod to a crankshaft. The conventional piston (10 ') can not absorb combustion pressure Since the piston ring 10 is formed integrally with the piston ring 10, the piston ring 10 can not effectively receive the negative (-) work and can be damaged by the strong combustion pressure during abnormal combustion. The upper body 10a is divided into a lower body 10b to which the connecting rod 20 is connected and the upper body 10b is divided into a lower body 10b and a lower body 10b, According to the present invention in which the buffer spring 12 is provided, the combustion pressure generated when the piston 10 is lifted is set to the upper body (-) work can be suppressed and the combustion pressure can be absorbed even when abnormal combustion is generated, so that the pressure of the piston 10 can be reduced. It is possible to prevent breakage.

Description

Piston structure of engine for an automobile

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston structure of an automobile engine that transmits power of a mixer combusted in a cylinder while reciprocating in a cylinder through a connecting rod to a crankshaft, Thereby improving durability.

Generally, a piston of an automobile engine is reciprocated upward and downward in a cylinder as shown in FIG. 1, and the power generated by the combustion of the mixer is transmitted to the crankshaft 30 The crankshaft is usually equipped with three to four piston rings at the top of the outer circumference thereof and a combustion gas pressure of about 20 meters per second (m / sec) Speed.

In addition, the cylinder wall due to a reciprocating motion while receiving a pressure of the piston 10 that the head is exposed to the combustion gases Celsius 1500-200 FIG. (° C), square centimeters per meter 40 kilograms (kg / cm ²⁾ as a shocking And a large friction occurs.

Therefore, the piston must satisfy the following conditions: a structure that does not leak gas at any temperature, a proper clearance for lubricating to minimize mechanical loss, low friction, low power loss due to inertia, and the like It is usually made of special cast iron or aluminum alloy.

On the other hand, in general, in an engine of an automobile, a combustion pressure is generated at the time of the rise of the piston, so that a (-) event occurs and knocking due to abnormal explosion combustion in the cylinder or high temperature and high pressure in the cylinder during the compression stroke, The combustion pressure applied to the piston becomes larger when abnormal combustion such as preignition occurs in which the surface of the electrode or valve is overheated and ignited before the completion of the compression stroke.

However, since the conventional piston 10 'shown in FIG. 2 is an integral type in which the combustion pressure can not be absorbed, the negative pressure (-) generated at the time of rising can not be effectively accommodated, There were many cases where it was damaged by the fire.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and its object is to provide a fuel injection device capable of absorbing a combustion pressure generated at the time of a piston rising, The present invention is to provide a piston structure of a durable automobile engine that does not suffer from the above problems.

FIG. 1 is a view showing a mounting state of a piston to which the present invention is related

2 is a partially cutaway perspective view of a conventional piston.

FIG. 3 is a block diagram of the present invention

Description of the Related Art [0002]

10: piston 10a: upper body

10b: Lower body 11: Piston ring groove

12: buffer spring 12a: spring bearing

13: cutting line 20: connecting rod

30: Crankshaft

In order to accomplish the above object, the present invention is characterized in that a piston, which has been conventionally manufactured as one body, is divided into an upper body and a lower body, while the upper body and the lower body are elastically coupled by a spring. The following will be described in more detail.

That is, the present invention constitutes a piston 10 of an automobile engine that transmits power generated by combustion of the mixer to the crankshaft 30 through the connecting rod 20 while reciprocating up and down in the cylinder as in the third aspect The piston 10 is divided into an upper body 10a having a piston ring groove 11 formed at its outer periphery and a lower body 10b connected to the connecting rod 20 while the upper body 10a, And at least one buffer spring 12 is provided between the lower body 10b coupled to the lower end thereof.

In the illustrated embodiment, a pair of buffer springs 12 are provided on both sides between the upper body 10a and the lower body 10b, and the buffer springs 12 are supported by a spring bearing 12a provided at the upper and lower ends thereof And is supported.

In the present invention, the parting line (13) for partitioning the upper body (10a) and the lower body (10b) is formed in the lower part of the piston ring groove (11) located at the lowermost end so as not to affect the air- And its shape can be changed into various shapes such as a waveform, a linear shape, a lattice shape, and the like.

Reference numeral 14 in the reference numerals denotes a piston pin coupling hole.

In the present invention constructed as described above, since the combustion pressure generated when the piston 10 is lifted can be absorbed by the buffer spring 12 provided between the upper body 10a and the lower body 10b, It is possible to prevent the piston 10 from being damaged by absorbing the combustion pressure even when abnormal combustion is generated.

As described above, according to the present invention, since the combustion pressure generated at the time of rising of the piston 10 can be absorbed, the piston 10 can operate more stably and the pressure applied to the piston 10 It is possible to prevent breakage of the piston 10 and to improve the durability of the entire engine as well as the piston 10.

Claims (2)

The pistons 10 of the automobile engine that reciprocate up and down in the cylinder and transmit the power generated by the combustion of the mixer to the crankshaft 30 via the connecting rod 20, The piston 10 is divided into the upper body 10a and the lower body 10b to which the connecting rod 20 is connected and the upper body 10a and the lower body 10b And at least one buffer spring (12) is provided between the piston 2. The piston ring according to claim 1, wherein the cutting line (13) for partitioning the upper body (10a) and the lower body (10b) is provided at a lower portion of the piston ring groove (11) Wherein the piston structure of the automobile engine is characterized in that: