KR20180029693A - Push Road for Power Cut Off - Google Patents

Abstract

The present invention relates to an apparatus for blocking power transmission for preventing breakage of an engine valve spindle. More particularly, the present invention is for preventing the breakage of the valve spindle and peripherals by stopping the valve spindle by interrupting power applied to the valve spindle in the event of collision between the valve spindle and a piston. In order to achieve the above object, the present invention provides a push rod for opening and closing the valve spindle by vertically moving the valve spindle of a cylinder head while moving in the vertical direction by rotation of a cam shaft, and comprises: an upper push rod connected to a rocker arm and located on the top of the divided push rod; a lower push rod which moves in the vertical direction by being rotated by a cam in contact with the cam shaft; and a binding member which binds the upper push rod and the lower push rod and is broken by impact applied to the valve spindle to release binding between the upper push rod and the lower push rod.

Description

Push Road for Power Cut Off}

The present invention relates to a push rod for opening and closing a valve by moving a valve spindle of an engine. More particularly, the present invention relates to a push rod for shutting down a valve spindle by interrupting power transmitted to a valve spindle in a collision between the valve spindle and a piston, And to prevent breakage of the exhaust-side equipment.

In the drawings, Fig. 1 is a sectional view showing a marine engine.

1, the piston 11 is located inside the engine cylinder 10 and the piston 11 is moved up and down inside the engine cylinder 10 by the expansion due to the explosion of the fuel, Power is transmitted to the crankshaft (not shown) by the crank 13 connected to the piston 11. And the power transmitted to the crankshaft is converted into the power required for the operation of the ship.

The intake valve spindle 15I and the exhaust valve spindle 15E are mounted on the cylinder head 20 and the rocker arm 24 is rotated by the push rod 22 interlocked with the cam shaft 17 in the up- And the intake valve spindle 15I and the exhaust valve spindle 15E are mounted on the yoke 26 mounted on the end of the rocker arm 24. [

Therefore, when the camshaft 17 rotates, the push rod 22 moves up and down along the outer circumferential surface of the cam 19, so that the intake valve spindle 15I or the exhaust valve spindle 15E moves up and down, Is opened and closed.

This operation is performed by the structure of the crankshaft and the structure of the cam 19 of the camshaft 17, and the intake (opening of the intake port and closing of the exhaust port), compression (closure of the piston and closure of the intake port) A cycle is constituted by four piston strokes, namely combustion expansion (descent of the piston) and exhaust (opening of the piston and opening of the exhaust port).

On the other hand, in the operating relationship between the piston 11 and the valve spindles 15I, 15E operating at several thousand revolutions per minute, an error occurs due to a gap defect in the valve spindles 15I, 15E or an external environment, and the valve spindles 15I, 15E And the piston 11 collide with each other, the collision occurs several hundreds to thousands of times within a few minutes, resulting in fragmentation due to fatigue failure.

The resulting debris travels by the air flow and eventually enters the expensive turbocharger and damages the blade of the turbocharger.

Korean Patent Publication No. 10-2002-0088182 (published on November 27, 2002)

The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a valve spindle in which when a valve spindle and a piston are impacted or an impact is applied to a valve spindle for another reason, So that the push rod can be prevented from being subjected to secondary damage in advance.

According to an aspect of the present invention, there is provided a push rod for opening and closing a valve spindle by vertically moving a valve spindle of a cylinder head in a vertical direction by rotation of a cam shaft, A lower push rod which moves in a vertical direction by being rotated by a cam in contact with the cam shaft and a lower push rod which is coupled with the upper push rod and the lower push rod and is broken by the impact applied to the valve spindle, And a binding member for releasing binding of the lower push rod.

According to a preferred embodiment of the present invention, the spacer is fixed to the upper end of the lower push rod, the spacer is inserted into the upper push rod, or the lower end of the upper push rod is inserted into the spacer, So that the spacer and the upper push rod are coupled through the rod.

Further, according to a preferred embodiment of the present invention, the spacer is inserted inside the upper push rod, and the coil spring located inside the upper push rod contacts the spacer to support the spacer.

According to a preferred embodiment of the present invention, the coil spring has an elastic force smaller than the elastic force of the coil spring located between the yoke and the cylinder head mounted on the upper end of the valve spindle to move the valve spindle upward.

As described above, in the push rod for blocking power transmission according to the present invention, when an impact is applied to the valve spindle during the operation of the engine, the push rod is divided by the impact to block the power transmission, And stops with the intake port or the exhaust port formed in the cylinder head being closed by the elastic force of the wrapping coil spring. As the shocked valve spindle stops, the valve spindle can be prevented from being damaged by the continuous shock which may be generated by continuous operation of the valve spindle.

In addition, by preventing breakage of the valve spindle, it is possible to prevent the generation of debris in advance. Conventionally, when fragments or the like are generated, debris flows along the exhaust gas of the engine as a rear equipment such as a turbocharger to cause secondary breakage. In the present invention, however, the exhaust port is closed by the stopped exhaust valve spindle, It is possible to prevent secondary breakage even if fragmentation occurs.

1 is a sectional view showing a marine engine.
2 is a conceptual view showing a push rod divided as a push rod for blocking power transmission according to the present invention,
3 is a sectional view of the push rod shown in Fig. 2,
4 is a cross-sectional view showing an operating relationship of the push rod in a state where the pin shown in Fig. 3 is broken and removed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a push rod for blocking power transmission according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a conceptual view showing a push rod divided as a push rod for blocking power transmission according to the present invention, and FIG. 3 is a sectional view of the push rod shown in FIG. And Fig. 4 is a cross-sectional view showing an operating relationship of the push rod in a state where the pin shown in Fig. 3 is broken and removed.

2, the tappet 101 is mounted on the lower end of the push rod 100 and the tappet 101 is positioned in contact with the outer circumferential surface of the cam 19 of the camshaft 17. As shown in Fig.

Therefore, when the camshaft 17 rotates, the push rod 100 moves in the vertical direction by the cam 19. [

On the other hand, as shown in Fig. 3, the push rod 100 is divided in its middle portion, and the divided portions are bound by the pin 130, which is a binding member.

The spacer 110 is positioned between the upper push rod 100H located at the upper portion and the lower push rod 100L located at the lower portion and the spacer 110 inserted into the upper portion of the lower push rod 100L State. The upper end of the spacer 110 is inserted into the lower end of the upper push rod 100H and the second coil spring 120 is located inside the upper push rod 100H to support the upper end of the spacer 110. At this time, it is preferable that the second coil spring 120 supports the spacer 110 in an unpressurized state, that is, not elastically deformed. Here, the spacer 110 has a structure for connecting the lower push rod 100L having the same inner diameter and the upper push rod 100H, in which the upper end of the lower push rod 100L is replaced by the upper push rod 100L, And may be configured to be expanded or contracted to be engaged with the lower end of the upper plate 100H.

In the state where the spacer 110 is inserted into the upper push rod 100H, the pin 130 passing through the spacer 110 and the upper push rod 100H is inserted. The pin 130 is broken when the valve spindle 15I or 15E hits the piston 11 or receives an impact due to another cause to release the coupling between the upper push rod 100H and the spacer 110, The breaking strength of the pin is correlated with the impact applied to the valve spindles 15I and 15E and the impact force applied to the pin spindles 15I and 15E is greater than the breaking strength of the pin 130. [ 130 are broken.

Hereinafter, the operating relationship of the push rod for blocking the power transmission constructed as described above will be described in detail.

As shown in Figs. 4 and 5, the push rod 100, which is in contact with the cam 19 by the rotation of the camshaft 17, moves up and down. The upper push rod 100H and the spacer 110 are coupled to the pin 130 and the spacer 110 is fixed to the lower push rod 100L so that the entire push rod 100 is vertically moved .

As the push rod 100 moves in the vertical direction as described above, one end of the rocker arm 24 jointed to the upper end of the push rod 100 is turned, and the rocker arm 24 is rotated And the valve spindles 15I and 15E mounted on the yoke 26 move up and down to open and close the intake port and the exhaust port formed in the cylinder head 20, respectively.

If the up-and-down movements of the valve spindles 15I and 15E and the reciprocating movements of the pistons 11 do not coincide with each other due to a malfunction of the engine or misoperation of the other components during the operation of the engine having the four-stroke cycle, The valve spindles 15I and 15E are brought into contact with each other, so that the impact is applied to the valve spindles 15I and 15E.

The impact is transmitted to the yoke 26, the rocker arm 24 and the push rod 100 in the reverse order of the power transmission order and the impact is transmitted to the pin 130 To the lower push rod 100L.

At this time, when the impact is larger than the fracture strength of the pin 130, the impact is caused to break the pin 130, and the binding of the upper push rod 100H and the spacer 110 is released. If the impact is smaller than the breaking strength of the pin 130, the impact is transmitted to the lower push rod 100L, but the valve spindle 130 is not damaged in such a small impact.

That is, the breaking strength of the pin 130 is smaller than the impact that the valve spindles 130 may be damaged, and becomes larger than the elastic force of the first coil spring 28 that moves the valve spindles 15I and 15E upward.

The upper push rod 100H and the spacer 110 are disengaged from each other when the pin 130 is broken and the upper push rod 100H and the spacer 110 are released from each other. The power transmitted to the rod 100L is not transmitted to the upper push rod 100H.

At this time, due to the elasticity of the first coil spring 28 described above, the valve spins 130 move upward to close the intake port 16I or the exhaust port 16E, and the impact applied to the valve spindles 15I and 15E Is located inside the cylinder as the exhaust port 16E is closed.

That is, the debris is prevented from flowing into the turbocharger along with the exhaust gas, thereby preventing secondary damage by the debris.

When the operation of the valve spindles 15I and 15E is stopped as described above, a warning is generated through detection of the temperature deviation of the exhaust gas and the like so that rapid measures can be taken.

The second coil spring 120 located inside the upper push rod 100H is smaller in elastic force than the first coil spring 28 surrounding the valve spindles 15I and 15E. Therefore, even if power is transmitted to the lower push rod 100L by the rotation of the camshaft 17, the spacer 110 moves in the vertical direction inside the upper push rod 100H, and the second The coil spring 120 compensates the vertical direction of the spacer 110.

10: Cylinder
11: Piston
13: Crank
15I, 15E: valve spindle
16I: intake port
16E: Exhaust
17: camshaft
19: Cam
20: Cylinder head
24: Rocker arm
26: York
28: first coil spring
100: push rod
100H: upper push rod
100L: Lower push rod
101: Tappi
110: Spacer
120: second coil spring
130: pin

Claims (4)

As a push rod for opening and closing the valve spindle 15E by moving the valve spindles 15I and 15E of the cylinder head 20 in the vertical direction while moving in the vertical direction by the rotation of the camshaft 17,
An upper push rod 100H connected to the rocker arm 24 and positioned on the upper portion of the divided push rod,
A lower push rod 100L which moves in the vertical direction by the rotation of the cam 19 in contact with the camshaft 17,
A binding member which binds the upper push rod 100H and the lower push rod 100L and is broken by the impact applied to the valve spindles 15I and 15E to release the coupling between the upper push rod 100H and the lower push rod 100L, Wherein the push rod is provided with a push rod.
The method according to claim 1,
The spacer 110 is fixed to the upper end of the lower push rod 100L and the spacer 110 is inserted into the upper push rod 100H or the lower end of the upper push rod 100H is inserted into the spacer 110, In pin (130) passes through the spacer (110) and the upper push rod (100H) to bind the spacer (110) and the upper push rod (100H).
3. The method of claim 2,
The spacer 110 is inserted into the upper push rod 100H and the coil spring 120 located inside the upper push rod 100H supports the spacer 110 in contact with the spacer 110. [ Push rod for blocking delivery.
The method of claim 3,
The coil spring 120 includes a coil spring 28 positioned between the cylinder head 20 and the yoke 26 mounted on the upper end of the valve spindle 15I, 15E to move the valve spindle 15I, The pushing force of the push rod is less than the elastic force of the push rod.

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