KR20010066035A - Crank shaft for engine - Google Patents

Abstract

PURPOSE: An engine crankshaft is provided to improve power transmission efficiency by rotating a flywheel with the torque transmitted from two crankshafts and to vary a compression ratio of mixed gas by changing combining position of the flywheel and a driven gear. CONSTITUTION: An engine crankshaft comprises a main gear(2) formed coaxially with a flywheel(1), first and second driven gears(3,4) combined to both ends of the main gear to rotated in engagement with the main gear, first and second crankshafts(5,6) axially supported on the first and second driven gears while having plural crank pins(7) for combination with a piston. As the flywheel is rotated by the rotational force transmitted from the two crankshafts, the transmission efficiency of power generated from an engine is improved. By the changing combining position of the flywheel and the driven gears, a compression ratio of mixed gas of the engine is varied.

Description

Crank shaft for engine

The present invention relates to a crankshaft for an engine, and in particular, constitutes two subordinate gears for transmitting power to a flywheel, and combines a crankshaft for a piston coupling to each subordinate gear so that the flywheel is rotated from the two crankshafts. By rotating the engine, the power transmission efficiency generated in the engine is improved, and the crankshaft for the engine is able to change the mixer compression ratio of the engine by changing the engagement position of the flywheel and the slave gear.

In general, an engine compresses and ignites a mixer with a piston reciprocating up and down in a combustion chamber, and generates power by using energy generated while the mixer is burned.

At this time, the crankshaft is to transfer the reciprocating motion of the piston to the flywheel by changing the rotational force.

3 shows a conventional crankshaft,

A plurality of crank pins 22 are formed on the shaft of a predetermined length, and a journal portion 21 is formed to engage the crank bearing on the element element, and one end of the crankshaft has a transmission. It is equipped with a flywheel that transmits power, and the crank pulley is coupled to the other end thereof.

In such a crankshaft, a crank pin 22 is generally formed according to the number of cylinders.

However, in the conventional crankshaft, since the crank pin 22 connected to the piston is formed to be fixed on the shaft, when the mixer compression ratio is to be changed to change the displacement of the engine, the crankshaft must be newly designed as a whole. In order to change the displacement of the engine from the designed crankshaft, the problem of having to redesign the crankshaft from the beginning occurred.

Accordingly, the present invention for solving the above problems constitutes two subordinate gears for transmitting power to the flywheel, and combines the crank shaft for piston coupling to each subordinate gear to rotate the flywheel with the rotational force transmitted from the two crankshafts. It is an object of the present invention to provide a crankshaft for an engine that improves the power transmission efficiency generated in the engine and rotates the mixer compression ratio of the engine as the rotational position of the flywheel and the subordinate gear changes.

Features of the present invention for achieving the above object,

A main gear formed coaxially with the flywheel;

First and second subordinate gears coupled to both sides of the main gear to rotate in engagement with the main gear;

First and second crankshafts respectively supported by the first and second subordinate gears, each of which includes a plurality of crankpins for engaging a piston;

Characterized in that consisting of.

In addition, the combustion chamber compression ratio of the engine may be varied as the coupling positions of the main gear and the first and second subordinate gears are changed.

1 shows a crankshaft of the present invention.

2 is a view showing a coupling relationship between a main gear and a slave gear applied to the present invention.

Figure 3 shows a conventional crankshaft.

※ Explanation of code for main part of drawing

1: flywheel 2: main gear

3,4: Subordinate gear 5,6: Crankshaft

7: crank pin 8: bearing

9: journal

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 1 and 2.

According to the figure, the present invention is roughly composed of a flywheel 1, a main gear 2, a slave gear 3, 4, and a crankshaft 5,6.

The flywheel 1 transmits power supplied from the engine to the transmission, and forms a main gear 2 at one end of the flywheel 1.

The main gear 2 is formed coaxially with the flywheel 1 and has a diameter smaller than that of the flywheel 1.

The first and second subordinate gears 3 and 4 transmit the rotational force transmitted from the crankshafts 5 and 6 to the main gear 2, and both sides of the main gear 2 as shown in FIG. 1. Are formed to engage each.

Each subordinate gear 3, 4 is coupled with a separate first and second crankshaft 5, 6.

Each crankshaft 5, 6 is formed with a plurality of crank pins 7 for engagement with the piston of the engine, and a journal portion 9 for coupling the crank bearing 8 to the element elements.

The number of crankpins 7 formed on the first and second crankshafts 5, 6 is to correspond to the number of cylinders of the engine.

That is, if the engine has four cylinders, two crankpins 7 are formed in each of the crankshafts 5 and 6, and if the engine has eight cylinders, each of the crankshafts 5 and 6 ), Four crank pins 7 are formed.

Each of the crankshafts 5 and 6 is rotated in the same direction to drive the first and second subordinate gears 3 and 4, and the first and second subordinate gears 3 and 4 rotate to the main. The gear 2 is rotated in one direction.

The rotational force of the main gear 2 is transmitted to the flywheel 1 existing on the coaxial as it is so that the vehicle can drive.

On the other hand, the biggest feature of the present invention is that it is possible to easily change the mixer compression ratio of the engine.

That is, as shown in Figure 2 by varying the coupling position of the main gear (2) and the subordinate gear (3) (4) it is possible to change the vertical reciprocating distance of the piston, and eventually change the mixer compression ratio of the engine You will be able to.

As shown in FIG. 2, when the subordinate gears 3 and 4 are horizontally engaged with the main gears 2 side by side, the axes of the subordinate gears 3 and 4 are slightly above the main gears 2. When the mixer compression ratio becomes larger.

As described above, the present invention constitutes two subordinate gears that transmit power to the flywheel, and combines the crankshaft for piston coupling to each subordinate gear to rotate the flywheel with the rotational force transmitted from the two crankshafts. In addition, there is an effect of providing a crankshaft for the engine to improve the power transmission efficiency generated in the engine, and to change the mixer compression ratio of the engine by changing the coupling position of the flywheel and the slave gear.

Claims (2)

A main gear 2 formed coaxially with the flywheel 1; First and second subordinate gears 3 and 4 coupled to both sides of the main gear 2 so as to rotate in engagement with the main gear 2; First and second crankshafts (5,6) respectively axially supported on the first and second subordinate gears (3,4) and having a plurality of crank pins (7) for engaging the piston; Crankshaft for the engine, characterized in that consisting of. The method of claim 1, The engine crankshaft, characterized in that the compression ratio of the combustion chamber of the engine can be varied by changing the engagement position of the main gear (2) and the first and second subordinate gears (3,4).