KR19990020865U - Cylinder head structure to prevent wear on the tappet - Google Patents

Abstract

It relates to a cylinder head structure for preventing the wear of the tappet used in the valve mechanism of the engine.In particular, a spiral groove is formed in the tappet bore of the cylinder head in which the tappet is slid to give the tappet a rotational movement along with the up and down reciprocation. It relates to a cylinder head structure for preventing the wear of the tappet focused on increasing durability by preventing oil, and transmits the rotational movement of the cam 20 to the valve 10 and at the same time the oil gallery on the cylinder head 5 side. A bucket 40 having an oil transfer circumferential groove 42 and an oil hole 43 for guiding oil therein at a position set from 5A, and a plunger receiving member 50 in the bucket 40. And a piston 70 and a plunger 60 for compressing oil introduced into the bucket 40 are slidably installed on the plunger receiving member 50, and the piston 70 and Play In the cylinder head (6) which made the tappet (30) of the valve mechanism provided with the steel ball (90) for preventing the backflow of the oil which flowed into the launcher (60) up and down in the tappet bore (6);

A plurality of spiral grooves 6A are formed on the inner wall of the tappet bore 6 to guide the rotational movement of the bucket 40.

Description

Cylinder head structure to prevent wear on the tappet

The present invention relates to a cylinder head structure for preventing the wear of the tappet used in the valve mechanism of the engine, and in particular, by forming a spiral groove in the tappet bore of the cylinder head in which the tappet slides, giving the tappet a rotational movement along with the up and down reciprocation. The present invention relates to a cylinder head structure for preventing uneven wear of a tappet which focuses on preventing durability of uneven wear of the tappet.

In general, each part of the valve mechanism expands as the temperature increases, so that the valve expands and the valve face and the valve seat do not come into close contact with each other, so that gas leaks.

To prevent this, a valve clearance is provided so that the clearance between the valve stem end and the rocker arm can be adjusted with an adjust screw to maintain the proper clearance when the engine is at operating temperature.

In other words, the change of the valve gap has a big influence on the opening and closing of the valve, and if the gap is too large, it makes noise and gives shocking force to each part of the valve mechanism, so as to maintain the performance of the engine and to prevent abnormal wear and noise Always adjust to the appropriate value.

In this way, the maintenance of the valve clearance is set to accurately maintain the opening and closing timing of the valve in preparation for the expansion of the valve, and the valve clearance changes according to the temperature change of the engine. However, the valve gap is a cause of noise or complicated handling, and in order to exclude this, conventionally, the valve 10 and the cam 20 of the valve 10 and the cam 20 as shown in FIGS. The tappet 30 is provided in between, and this tappet 30 is assembled so that sliding movement in the cylinder head 5 is possible.

The tappet 30 is a cylindrical having a cam contact portion 41 on the upper surface of the oil transfer circumferential groove 42 for guiding the oil supplied to the oil gallery 5A of the cylinder head 5 to the circumferential surface therein; And an oil inlet 43 is formed in the circumferential groove 42 for oil transfer, and a bucket 40 having an oil supply groove 44 formed in the bottom of the cam contact portion 41 is provided. The plunger receiving member 50 is fixedly installed on the inner circumferential surface of the), the plunger 60 is assembled to the inner circumferential surface of the plunger receiving member 50 so as to be able to slide in a predetermined section, and on the inner circumferential surface of the plunger 60. A piston 70 having an oil hole 71 and a steel ball seat surface 72 is slidably installed therein, and a steel ball receiving member 80 is mounted on the bottom of the piston 70, and the steel ball receiving member ( 80 and the steel ball seat surface 72 of the piston 70 is in contact with the steel ball seat surface 72 by a ball valve spring 90 (1) 00) is installed, the plunger spring 110 for pushing the steel ball receiving member 80 and the plunger 60 in different directions between the steel ball receiving member 80 and the plunger 60 is installed.

The conventional tappet 30 configured as described above removes the valve gap by the following action.

That is, as shown in FIG. 1, when the cam 20 is located at the bottom dead center and contacts the upper surface of the bucket 40, the bucket is transferred through the oil gallery 5A through the oil groove circumferential groove 42 and the oil hole 43. The oil is supplied into the oil storage chamber 45 of the 40, and is then filled into the upper side of the piston 70 through the oil supply groove 44, and at the same time, the ball valve spring 90 overcomes the force and the steel balls ( By pressing 100, the fluid is filled in the pneumatic chamber 63 between the piston 70 and the plunger 60 to form an oil pressure.

When the knob of the cam 20 pushes the upper surface of the bucket 40 in such a state, the oil supply to the tappet 30 through the oil gallery 5A of the cylinder head 5 is blocked as shown in FIG. 2, and the piston 70 is subjected to the downward pressure integrally with the bucket 40.

In this case, the steel ball 100 between the piston 70 and the steel ball receiving member 80 is brought into close contact with the steel ball seat surface 72 of the piston 70, and the high pressure between the piston 70 and the plunger 60 is maintained. The chamber 63 has a high oil pressure.

Therefore, even if the cam 20 moves the valve 10 to the lowest point and then rises again, the piston 70 pushes the bucket 40 upward with the high oil pressure formed between the piston 70 and the plunger 60. The clearance between the cam 20 and the tappet 30 can be maintained at " 0 ".

As such, the conventional tappet 30 has a pressure between the piston 70 and the plunger 60 at all times when the engine is driven so that the valve gap disappears, so that the tappet 30 and the cam 20 are operated. Does not cause noise.

As described above, the conventional tappet 30 converts the rotational movement of the cam 20 into a linear movement and transmits the oil to the valve 10, and at the same time, the oil is introduced into the oil at the position set from the oil gallery 5A on the cylinder head 5 side. Guide the oil plunged into the interior of the bucket 40 from the plunger receiving member 50 between the piston 70 and the plunger 60 to cushion the impact of the contact of the cam 20 to remove the valve gap Let's go.

By the way, the tappet 30 receives the rotational movement of the cam 20 in one direction, that is, the tappet reciprocating vertically reciprocating because the knob of the cam 20 is eccentrically applied to the upper surface of the bucket 40 ( Uneven wear occurs on the wall surface of the bucket 40 of 30).

The abrasion of the tappet 30 causes the tappet 30 to deteriorate the durability of the tappet 30 when the tappet 30 moves up and down in the tappet bore 6 of the cylinder head 5, and the oil flowing into the bucket 40 is partially worn. It leaks out and becomes a cause to lower pressure formation efficiency.

The present invention is to solve the problems of the prior art as described above, by forming a spiral groove in the tappet bore of the cylinder head in which the tappet is slid, giving the tappet a rotational movement with the up and down reciprocation to prevent the wear of the tappet to improve durability It is an object of the present invention to provide a cylinder head structure for preventing uneven wear of a tappet focused on increasing.

Specific means of the present invention for achieving the above object, while transmitting the rotational movement of the cam 20 to the valve 10 at the same time the oil inside the oil at a position set from the cylinder 5 side oil gallery (5A) Bucket 40 having a circumferential groove 42 and the oil hole 43 for the oil transfer to the guide, and the plunger receiving member 50 is fixed to the inside of the bucket 40, the plunger receiving member ( In the 50, the piston 70 and the plunger 60 for compressing the oil introduced into the bucket 40 are slidably installed, and the backflow of the oil flowing into the piston 70 and the plunger 60 is provided. In the cylinder head (6) which makes the tappet (30) of the valve mechanism provided with the steel ball (90) for preventing the sliding in the tappet bore (6) up and down; A plurality of spiral grooves 6A are formed on the inner wall of the tappet bore 6 to guide the rotational movement of the bucket 40.

According to the above means, when the tappet is moved up and down in the tappet bore of the cylinder head, the lubricating oil is applied to the bucket in a tangential direction by a spiral groove formed in the friction surface of the tappet bore, thereby unidirectionally moving the tappet up and down. It can rotate to prevent uneven wear.

1 and 2 is a cross-sectional view of a conventional tappet according to the rotation angle of the cam.

Figure 3 is an installation state of the tappet according to an embodiment of the present invention.

4 is a configuration diagram of a wall surface of a cylinder head seen from above the tappet in FIG.

<Explanation of symbols for main parts of the drawings>

5: cylinder head 6: tappet bore

6a: Spiral groove 10: Valve

20: Cam 30: Tappet

40: bucket 42: circumferential groove for oil transfer

43: oil hole 50: plunger receiving member

60: plunger 70: piston

90: steel ball

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

As shown in FIG. 3, the oil movement is performed to transfer the rotational movement of the cam 20 to the valve 10 and to guide the oil to the inside at the position set from the oil gallery 5A on the cylinder head 5 side. A bucket 40 having a circumferential groove 42 and an oil hole 43 and a plunger receiving member 50 are fixedly installed in the bucket 40, and the bucket 40 is mounted on the plunger receiving member 50. Piston 70 and the plunger 60 for sliding the oil introduced into the inside slidably installed, and the steel ball (90) for preventing the back flow of oil introduced into the piston 70 and the plunger 60 A cylinder head (6) in which the tappet (30) of the valve mechanism (10) is slideable up and down within the tappet bore (6);

In the inner wall of the tappet bore 6, a plurality of spiral grooves 6A for inducing a rotational movement of the bucket 40 are formed.

The operation of this embodiment configured as described above will be described.

First, as shown in FIG. 3, when the cam 20 is located at the bottom dead center and reaches the top surface of the bucket 40 (the bucket 40 has completed the ascending operation), as shown in FIG. 3, the oil gallery 5A. Oil is supplied to the inside of the bucket 40 through the oil transfer circumferential groove 42, the oil hole 43 through the oil transfer, and then filled into the piston 70 through the oil overlap groove 44 and return spring (90) By defeating the force and pressing the steel ball 100, the fluid is filled between the piston 70 and the plunger 60 to form an oil pressure.

When the knob of the cam 20 presses the upper surface of the bucket 40 in this state (the bucket 40 has completed the ascending operation), the tappet 30 through the oil gallery 5A of the cylinder head 5 is pressed. The oil supply to the gas is cut off, and the piston 70 is subjected to the downward pressure integrally with the bucket 40.

In this case, the steel ball 100 between the piston 70 and the steel ball receiving member 80 is brought into close contact with the steel ball seat surface 72 of the piston 70, and a high diameter is formed between the piston 70 and the plunger 60. Oil pressure builds up.

Therefore, even if the cam 20 moves the valve 10 to the lowest point and then rises again, the piston 70 pushes the bucket 40 upward with the high oil pressure formed between the piston 70 and the plunger 60. The clearance between the cam 20 and the tappet 30 can be maintained at " 0 ".

In this manner, when the tappet 30 performs the imaginary movement of the tappet bore 6 in the cylinder head 5 by the cam 20, lubrication friction is generated between the inner wall of the tappet bore 6 and the outer wall of the bucket 40. Get up.

At this time, when the tappet 30 is lifted by the lubricating oil used, the rotational force is applied in the circumferential direction of the bucket 40 by the lubricating oil filled in the spiral groove 6A formed in the tappet bore 6 of the cylinder head 5.

Therefore, the tappet 30 repeatedly repeating the vertical movement is rotated while receiving the contact force of the cam 20, thereby preventing the wear of the tappet 30 due to the eccentric force of the cam 20, and eventually tappet The durability of the 30 can be improved and the life can be increased.

As described above, according to the present invention, when the tappet is moved up and down in the tappet bore of the cylinder head, the lubricating oil is applied to the bucket in a tangential direction by the spiral groove formed on the friction surface of the tappet bore, and thus the top and bottom of the tappet. Rotation in one direction during exercise can prevent uneven wear.

Claims (1)

The circumferential groove 42 for oil transfer and oil for transmitting the rotational movement of the cam 20 to the valve 10 and guiding the oil therein at the position set from the oil gallery 5A on the cylinder head 5 side. A bucket 40 having a hole 43 and a plunger receiving member 50 are fixedly installed in the bucket 40, and the plunger receiving member 50 is filled with oil introduced into the bucket 40. The valve mechanism is provided with a steel ball (90) for sliding the piston 70 and the plunger (60) for compression, and prevents the reverse flow of oil introduced into the piston (70) and the plunger (60). A cylinder head (6) which makes the tappet (30) slide up and down within the tappet bore (6); Cylinder head structure for preventing wear of the tappet, characterized in that formed on the inner wall of the tappet bore (6) a plurality of spiral grooves (6A) for inducing a rotational movement of the bucket (40).