KR100333856B1 - Jig for fixing camshaft of double overhead camshaft engine - Google Patents

Abstract

PURPOSE: A camshaft fixing jig is provided to prevent a cam pulley from being slipped out from a camshaft due to the tension of a timing belt by simultaneously fixing each camshaft. CONSTITUTION: A camshaft fixing jig includes a handle section(10), a fixed finger section(20) formed at the left end of the handle section(10), and a rotating finger section(30) formed at the right end of the handle section(10). Hexagonal nuts(7,8) of camshafts are inserted into the finger sections(20,30). The rotating finger section(30) is hinged to the right end of the handle section(10) and elastically supported by a retaining ring(50) installed in a hinge pin(40).

Description

Jig for fixing camshaft of double overhead camshaft engine

The present invention relates to a camshaft fixing jig for a double overhead camshaft (hereinafter referred to as DOHC) type engine, and more specifically, to cam two camshafts provided in a DOHC engine having two intake and exhaust valves. A jig for fixing each camshaft to be assembled to a pulley.

In general, the engine of an automobile is a cylinder block having a cylinder according to the number of cylinders, a cylinder head mounted on the cylinder block, a cylinder head provided with an intake / exhaust valve and an opening / closing mechanism, and reciprocating in the cylinder block to compress and explode fuel to generate power. Piston, connecting rod connected to the lower part of the piston, crankshaft connected to the lower end of the connecting rod to convert the linear movement of the connecting rod into rotational movement, and connected to the valve opening mechanism by belt or chain to the crankshaft and connected to the valve opening mechanism It includes a camshaft for receiving power to provide power to open and close the valve.

However, in recent years, as consumers prefer vehicles with powerful output engines, many engines equipped with so-called DOHC engines have been installed by increasing the intake / exhaust valves installed one by one each in the cylinder head one by one. It is spreading.

Therefore, the DOHC engine provided with two intake and exhaust valves is also provided with two cam shafts for opening and closing the intake and exhaust valves. As described above, each camshaft is configured to open and close the intake / exhaust valve by receiving power from the crankshaft, so that the camshaft and the crankshaft are connected by a timing belt.

As shown, a pair of camshafts (1, 2) are arranged in parallel on the top of the crankshaft (not shown), and the crank pulley (not shown) and the cam at one end of the crankshaft and each camshaft (1,2) The pulleys 3 and 4 are fastened by the bolts 5. The crank pulley and the cam pulleys 3 and 4 are connected by the timing belt 6. On the other hand, hex nuts 7 and 8 are fastened to the cam shafts 1 and 2.

In the conventional method of assembling the crankshaft and the pair of camshafts 1 and 2 so as to be connected as described above, the camshafts 1 and 2 are first inserted into the cam pulleys 3 and 4, and the bolts 5 When the timing belt 6 is engaged with the crank pulley and the cam pulleys 3 and 4 in this state, the cam shafts 1 and 2 are fixed by the tension of the timing belt 6. Then, the bolt 5 was finally tightened to fix the cam pulleys 3 and 4 to the cam shafts 1 and 2.

However, in the related art, since the timing belt 6 is fastened with the cam pulleys 3 and 4 pre-tightened to the cam shafts 1 and 2 with the bolts 5, the cam shafts 1 and 2 are not fixed. Accidents occur in which the cam pulleys 3 and 4 are pulled out of the cam shafts 1 and 2 due to the tension of the belt 6.

Accordingly, an object of the present invention is to provide a camshaft fixing jig for a double overhead camshaft engine that can simultaneously fix each camshaft so that the cam pulley does not come off from the camshaft by the tension of the timing belt.

1 is an exploded perspective view showing a method of connecting a conventional cam shaft and the crankshaft with a timing belt

Figure 2 is a view showing a camshaft fixing jig according to the invention

-Explanation of symbols for the main parts of the drawing-

10-handle 11-long hole

20-Fixed Finger 30-Rotating Finger

40-hinge pin 50-retaining ring

In order to achieve the above object, the present invention, in order to assemble a pair of cam pulley, which is caught by the timing belt for transmitting power from the crankshaft to the pair of camshaft to each of the camshaft, is fastened to the outer periphery of each camshaft Jig for fixing the hexagonal nuts at the same time,

A handle part having a long hole through which a worker's finger is fitted; A fixed finger part formed at one lower end of the handle part and into which one hexagon nut of the cam shaft is fitted; A rotating finger part connected to a lower end of the handle part by a hinge pin so as to correspond to a distance between the cam shafts in the fixed finger part, and into which a hexagon nut of the other cam shaft is fitted; And a retaining ring installed on the hinge pin, the retaining ring elastically supporting in the direction in which the rotary finger portion is retracted inward.

According to the configuration of the present invention described above, when the hex nut of one camshaft is fixed to the rotating finger portion while the handle portion is held by hand, and the hex nut of the other camshaft is fixed with the fixing finger portion, the pair of camshafts is connected to the jig. It is firmly fixed by

EXAMPLE

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

2 is a view showing a camshaft fixing jig according to the present invention.

For reference, in the description of the configuration of the present embodiment, the same parts as in the prior art described at the beginning of the specification are omitted and repeated descriptions are mainly described in order to avoid duplication of description. use.

As shown in the figure, the jig of the present invention capable of simultaneously fixing a pair of camshafts is provided at a handle portion 10 having a long hole portion 11 and at both lower ends of the handle portion 10 so as to be provided with hexagonal nuts of each camshaft. It consists of fixed and rotating fingers 20 and 30 into which 7 and 8 are fitted.

The handle portion 10 is a rectangular shape having a substantially long horizontal length, and a long hole portion 11 in which a finger can be inserted along the transverse direction is formed in the middle portion thereof.

The fixed finger portion 20 is formed integrally with the horizontal line at the lower left corner of the handle portion 10, the groove portion is formed in the lower end of the hexagon nut (8).

The rotating finger part 30 is the same shape as the fixed finger part 20, but unlike the fixed finger part 20, the hinge pin 40 is connected to the lower right side of the handle part 10 by the hinge pin 40. It is elastically supported in the direction to be always retracted by the retaining ring 50 installed in.

Hereinafter, the operation of this embodiment configured as described above will be described in detail.

First, when the handle 10 is held by hand, the finger is inserted into the long hole 11 so that the operator can lift the handle 10 by hand. In this state, when the hex nut 7 of any camshaft is inserted in the rotary finger portion 30 and the handle portion 10 is rotated, the rotary finger portion 30 resiliently supports the retaining ring 50. While rotating in the opposite direction and the hex nut 8 of the other camshaft is fitted to the fixed finger portion 20.

Thus, in the state which fixed each camshaft with a jig, a cam pulley may be fastened with a bolt to each camshaft, and a timing belt may be fastened to a crank pulley and a cam pulley. At this time, since the camshaft is firmly fixed to the jig of the present invention, the cam pulley does not come off the camshaft due to the tension of the timing belt.

As described above, according to the present invention, it is possible to fix each camshaft firmly with a jig, so that an accident in which the cam pulley falls out of the camshaft due to the tension of the timing belt can be prevented in advance.

On the other hand, the present invention is not limited to the above-described specific preferred embodiments, and various changes can be made by those skilled in the art without departing from the gist of the invention claimed in the claims. will be.

Claims (1)

A jig for simultaneously fixing hexagon nuts fastened to the outer periphery of each camshaft, in order to assemble a pair of cam pulleys to which the timing belt for transmitting power from the crankshaft to the pair of camshafts is assembled to the respective camshafts, A handle part having a long hole through which a worker's finger is fitted; A fixed finger part formed at one lower end of the handle part and into which one hexagon nut of the cam shaft is fitted; A rotating finger part connected to a lower end of the handle part by a hinge pin so as to correspond to a distance between the cam shafts in the fixed finger part, and into which a hexagon nut of the other cam shaft is fitted; And a retaining ring installed on the hinge pin, the retaining ring elastically supporting the rotating finger portion in a direction retracted inward.

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