KR0167928B1 - Driving device of dohc type cam shaft using link method - Google Patents

Abstract

The present invention relates to a DOHC type camshaft driving apparatus using a link method, and more particularly, in a DOHC type camshaft driving apparatus configured to transmit power of a crankshaft driving pulley to an inlet and an extremity camshaft. The single cam shaft driven pulley provided on the cylinder block of the engine is rotatably wound and the timing belt is wound to be connected to each other, and the central axis of the single cam shaft driven pulley is rotatably connected so that both ends are fixed to the cylinder block of the engine. The fixed bracket, and the link connecting disc is fixedly provided at one end of the inlet and the axial cam shaft, respectively, and the outer circumferential edge is driven once the outer circumference and the pair of link connecting discs are eccentric to the single cam shaft driven pulley. Link connecting means provided to be interconnected to be transmitted to and rotated in the same direction together It is configured to be characterized.

According to the present invention as described above is provided with a single cam shaft driven pulley and link connecting means to reduce the bending angle and the bending point of the belt in the section in which the timing belt is wound on the drive and driven pulley to reduce the length of the belt and At the same time, the service life of the belt is improved to reduce the occurrence rate of malfunction of the engine, thereby improving the merchandise and reliability of the product.

Description

DOHC type camshaft drive using link method

1 is a schematic view showing a state in which a timing belt is wound around a conventional dual cam shaft pulley and a crankshaft drive pulley.

2 is a schematic view showing a state in which a timing belt is wound around a single camshaft driven pulley and a crankshaft driving pulley according to the present invention.

Figure 3 is provided with a link means for power transmission between the inlet and the axial cam shaft and the single cam shaft driven pulley of the present invention is connected to the timing belt so that the power of the crankshaft drive pulley is transmitted to the cam shaft driven pulley It is a perspective view of the main part which showed the wound state.

* Explanation of symbols for main parts of the drawings

10: crankshaft driving pulley 20: camshaft driven pulley

21: central axis 22: fixed bracket

23: connecting shaft 30: timing belt

40: inlet, left camshaft 41: link connecting disc

42: fastening-bar 50: tensioner

60: idler

The present invention relates to a DOHC type camshaft driving apparatus using a link method, and in particular, an inlet built into the engine by means of a power transmission link operatively mounted to a single camshaft driven pulley, and an extremity camshaft provided to be capable of driving. Bending angle in the section in which the timing belt is wound so that the power of the crankshaft drive pulley is transmitted to the cam shaft driven pulley, and the tensioner and idler are respectively mounted so that the tension of the timing belt is elastically maintained. The present invention relates to a DOHC type camshaft driving apparatus using a link method that reduces bending points and shortens the length of a belt and improves service life.

In general, DOHC type camshafts (camshafts) used in vehicles have a plurality of inlet / exhaust camshafts with inlet / exhaust camshafts formed with a plurality of cams for opening and closing the intake / exhaust valves in a 4 cycle reciprocating engine. Since the crankshaft opens and closes once each during two rotations, the crankshaft rotates at 1/2 the speed of the crankshaft. It is usually made of cast steel to harden only the cam surface in order to improve wear resistance, and cam shaft driven pulleys are provided at one end of the inlet and the ignited cam shaft, respectively.

In addition, the crankshaft drive pulley mounted on one end of the crankshaft and the inlet, the camshaft driven pulleys of the ignition cam shaft are interconnected so that the power of the crankshaft drive pulley is transmitted so that the timing belt is rotated in the same direction together. It is wound up.

The timing belt is wound around each pulley with a predetermined tension at a predetermined interval between the crankshaft driving pulley on which the timing belt is wound and a pair of camshaft driven pulleys respectively provided at one end of the inlet and the axial camshaft. The tensioner and idler are fixed to each other so as to rotate.

The conventional DOHC type camshaft driving device having the configuration as described above is briefly described with reference to FIG.

A plurality of cams are formed at predetermined intervals, and the inlet and axial cam shafts are respectively installed in the cylinder head assembly of the engine, and the pair of cam shaft driven pulleys 1 at each end of the inlet and axial cam shafts are respectively spaced apart. It is fixed to the position between the camshaft driven pulleys (1), the crankshaft driving pulley (2) is fixedly installed at one end of the crankshaft, the pair of camshaft driven pulley (1) and the crank The timing belt 3 is wound so as to be wound to be connected to the shaft drive pulley 2 and rotate together in the same direction.

In addition, the timing belt is spaced between the crankshaft drive pulley 2 in which the timing belt 3 is wound and a pair of camshaft driven pulleys 1 provided at one end of each of the inlet and ignited cam shafts. The tensioner 4 and the idler 5 are respectively mounted so that 3 may be wound around each pulley with a predetermined tension.

The conventional DOHC type camshaft driving device having such a configuration has the drive pulley 2 rotated when the crankshaft driving pulley 2 mounted at one end of the crankshaft which changes the reciprocating motion of the piston provided in the engine into the rotational motion. A pair of camshaft driven pulleys (1) connected by a timing belt (3) are rotated to drive the inlet and the ignited camshafts, respectively, to provide a plurality of intake / exhaust valves provided in the cylinder head assembly of the engine. It works.

However, such a conventional DOHC type camshaft drive has a timing driven such that the driven pulley connected to the crankshaft rotates together with the crankshaft drive pulley and the pair of camshaft driven pulleys to transfer power to the camshaft driven pulley. Since the belt is wound, the length of the belt is long, and the tensioner and the idler are mounted so that the tension of the timing belt is elastically maintained, so that the bending angle is small in the section in which the timing belt is wound. Since the engine malfunction may be reduced, there is a problem that the merchandise and reliability of the product may be degraded.

SUMMARY OF THE INVENTION The present invention has been made to fundamentally solve the problems of the prior art, and an object thereof is to drive an inlet and an extruded cam shaft built into the engine by means of a power transmission link operatively mounted to a single cam shaft driven pulley. The timing belt is wound so that the power of the crankshaft drive pulley is transmitted to the cam shaft driven pulley, and the tensioner and the idler are respectively mounted so that the tension of the timing belt is elastically maintained. The present invention provides a DOHC type camshaft driving apparatus using a link method that reduces the bending angle and the bending point, thereby reducing the overall length of the belt and improving the service life.

In order to achieve the above object, the present invention is a DOHC type camshaft drive device configured to transmit the power of the crankshaft drive pulley to the inlet, the ignition cam shaft, the timing belt is wound so as to be interconnected with the crankshaft drive pulley A single camshaft driven pulley provided in the cylinder block of the engine so as to be rotatable, a central bracket of the single camshaft driven pulley is rotatably connected, and fixed brackets fixed at both ends to the cylinder block of the engine, the inlet, Link connecting discs are fixed to one end of the axial cam shaft, and the outer periphery is transmitted to the power once the outer periphery and the pair of link connecting discs are eccentric to the single cam shaft driven pulley. It is characterized by consisting of a link connecting means provided to be interconnected to rotate .

Wherein the link connecting means is connected to each other so as to be rotatably connected to the front end of the outer periphery one end of the outer circumference is formed eccentrically on the rear end of the outer cam circumferentially eccentrically from the central axis of the single cam shaft driven pulley A connecting shaft which is attached to the single cam shaft driven pulley eccentrically protruding from the fastening bar is rotatably connected to the intermediate portion of the fastening bar so that the link connecting disc rotates in the same direction as the cam shaft driven pulley is driven; .

In the present invention as described above, a single cam shaft driven pulley and a link connecting means are provided to reduce the bending angle and the bending point of the belt within the section in which the timing belt is wound on the driving and driven pulley, thereby reducing the overall length of the belt. At the same time, the service life of the belt is improved to reduce the malfunction rate of the engine, thereby improving the merchandise and reliability of the product.

Hereinafter, a preferred embodiment of the camshaft drive device of the present invention as described above will be described in detail with reference to the accompanying drawings.

2 is a schematic view showing a state in which a timing belt is wound around a single cam shaft driven pulley and a crankshaft driving pulley according to a preferred embodiment of the present invention, and FIG. 3 is an inlet and axial cam shaft and a single cam of the present invention. Each of the shaft driven pulleys is provided with a link means for power transmission to each other, the main part of the perspective view showing a state in which the timing belt is wound so that the power of the crankshaft drive pulley is transmitted to the cam shaft driven pulley.

Referring first to Figures 2 and 3, the present invention is mounted to the crankshaft drive pulley 10 is rotated to one side end of the crankshaft to change the reciprocating motion of the piston provided in the engine to the rotational movement, the upper portion A single camshaft driven pulley 20 is disposed at predetermined intervals and connected to the fixed bracket 22 so that the central shaft 21 is rotatable. The driving pulley 10 and the driven pulley 20 are mutually provided. The timing belt 30 is wound up to be connected.

The link connecting discs 41 are respectively fixed to one end of the inlet and the extremity cam shaft 40, and both ends of the fastening-bars 42 are connected to each other at one end of the front outer periphery of the link connecting discs 41. Each of the fastening-bars 42 fixed to the link connecting discs 41 is fixed to each other so as to be eccentric and protruded eccentrically to one end of the outer periphery of the rear surface of the cam shaft driven pulley 20. It is pivotally interconnected in the middle.

Here, the timing belt 30 is spaced between the crankshaft drive pulley 10 and the single cam shaft driven pulley 20 in which the timing belt 30 is wound, and the timing belt 30 has a predetermined tension with each drive pulley 10. The tensioner 50 and the idler 60 are respectively mounted so that the tensioner 50 and the idler 60 may rotate so that the driven pulley 20 may be wound.

The present invention having the configuration as described above operates as follows.

First, a single camshaft driven connected by a mutual timing belt 30 together with a crankshaft drive pulley 10 mounted at one end in accordance with the operation of the crankshaft which converts the reciprocating motion of the piece cylinder provided inside the engine into a rotary motion. The pulley 20 is rotated and the connecting shaft 23 and the link connecting disc 41 provided at one end of each of the inlet and the extremity camshaft 40 are formed eccentrically protruding from the rear surface of the driven pulley 20. The link connecting disc 41 also runs along the driven pulley 20 which is connected to the fastening-bars 42 which are respectively mounted at both ends of the outer circumference so as to be eccentric and rotated together with the driving pulley 10. A plurality of intake / exhaust valves provided in the cylinder head assembly of the engine are operated for the plurality of cams that are rotated and formed on the inlet, the extruded cam shaft 40.

As described above, according to the present invention, a belt angle and a bending point of the belt are reduced in a section in which the timing belt 30 is wound around the drive and driven pulley by having a single cam shaft driven pulley and a link connecting means. In addition, the service life of the belt can be shortened, and the occurrence rate of malfunction of the engine can be reduced, thereby improving the merchandise and reliability of the product.

In the above, the present invention has been described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and is provided to those skilled in the art without departing from the gist of the present invention. Various changes and modifications can be made by this.

Claims (2)

In the DOHC type camshaft drive device configured to transfer the power of the crankshaft drive pulley to the inlet and the axial camshaft, a timing belt is wound around the crankshaft drive pulley and is provided on the cylinder block of the engine so as to be rotatable. Single camshaft driven pulley; A fixed bracket in which the central axis of the single camshaft driven pulley is rotatably connected and fixed at both ends to the cylinder block of the engine; A pair of link connecting disks fixed to one end of the inlet and the axial cam shaft and the single cam shaft driven pulley are connected to each other so as to rotate the link connecting disks in the same direction by interlocking with the rotation of the driven pulleys. DOHC type camshaft driving device using a link method, characterized in that consisting of a link connecting means for. According to claim 1, wherein the link connecting means is rotated on the front end of the outer periphery one end of the outer circumferentially formed on the outer circumferential one end of the outer circumferential end of the single cam shaft driven pulley eccentrically to the pair of link connecting disks The connecting bar is mounted so as to be interconnected so that the connecting shaft is eccentrically protruded from the single cam shaft driven pulley and is rotatably connected to an intermediate portion of the fastening bar so that the link connecting disc is driven together with the driving of the cam shaft driven pulley. DOHC type camshaft driving apparatus using the link method, characterized in that the rotation in the same direction.