JPH064007Y2 - Engine valve device lubrication structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention drives a valve by swinging a swing arm equipped with a roller that comes into contact with a cam with one end pivotally supported by a hydraulic lash adjuster. The present invention relates to a lubrication structure in an engine valve gear configured to operate.

(Prior Art) Conventionally, a hydraulic lash adjuster that can automatically maintain the valve lash in a cello state in order to reduce the noise and facilitate maintenance without adjusting the valve lash ( Hereinafter, a valve operating mechanism of an engine in which "HLA" is abbreviated) is known.

Further, as disclosed in Japanese Utility Model Publication No. 60-29616, a roller is rotatably attached to one end of a rocker arm swingably supported by a rocker shaft, and the roller is used as a cam follower to make rolling contact with the cam. By doing so, a configuration has been proposed in which the frictional resistance between the cam and the rocker arm is reduced to reduce power loss and wear. In that case, the lubrication of the rolling contact surface between the roller and the cam is also important, but in particular, the lubrication of the sliding contact surface between the roller and the shaft supporting the roller is important. In this configuration, the roller that contacts the cam is pivotally supported by the hollow support pin attached to the rocker arm, and the support pin is provided with an oil hole that radially penetrates the support pin to penetrate into the hollow portion of the support pin. The oil contained in the oil mist is introduced to the contact surface between the roller and the support pin through the oil hole to lubricate the contact surface.

However, as described above, if the oil in the oil mist that has entered the hollow portion of the support pin is guided to the contact surface between the pin and the roller through the oil hole and the contact surface is lubricated, the roller and the support pin are not easily lubricated. It was difficult to always obtain a good lubrication state during the period.

(Object of the Invention) Accordingly, an object of the present invention is to provide a valve operating device lubrication structure capable of always maintaining a good lubrication state between a roller and a support pin that axially supports the roller.

(Structure of the Invention) According to the present invention, a swing arm having a hollow support pin and a roller rotatably supported by the support pin and contacting a cam is pivotally supported at one end by an HLA provided on a cylinder head. A lubrication structure in an engine valve operating device configured to swing to drive a valve in a state where the cylinder head is provided in the cylinder head for supplying oil to the HLA. A first oil passage branched from the oil supply passage and extending toward the camshaft, and a first oil passage branched from the first oil passage and extended toward the swing arm side, and oil is introduced into the hollow portion of the support pin. And a second oil passage having an oil jet port capable of jetting. Also, on the swing arm side, a through hole is provided in the support pin, which penetrates the peripheral wall of the support pin in the radial direction and communicates the support pin with the contact surface (bearing surface) between the hollow portion and the roller / support pin. The hollow portion on the side opposite to the oil injection port side with respect to the through hole is closed.

(Effect of the Invention) According to the present invention, oil is injected from the oil injection port on the cylinder head side into the hollow portion of the roller support pin, and
Since the hollow portion on the back side of the position where the through hole is provided is closed, oil accumulates in the hollow portion, and this oil is supplied to the contact surface between the roller and the support pin through the through hole. Therefore, the lubrication state between the roller and the support pin can be kept good. Further, bubbles contained in the oil supplied to the HLA escape into the atmosphere through the oil injection port, so that the function of the HLA can be improved. Further, the oil injected from the oil injection port can be supplied also to the contact surface between the cam and the roller as the swing arm swings, thereby obtaining a good lubrication state between the cam and the roller. There are also advantages.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of a cylinder head equipped with a DOHC type valve operating device, and FIG. 2 is a plan view of one cylinder thereof. An inner pivot pivotally supported at one end by an HLA 10 provided on the cylinder head 1. The swing arm 11 is configured to push down the valve 12 at the other end. The cylinder head 1 is formed with an intake port 3 and an exhaust port 4 opening to the combustion chamber 2, and the intake port 3 and the exhaust port 4 are provided with four valves 12 for opening and closing each of them. And valve 12
Is urged upward by the valve spring 5 in the valve closing direction. Two cam shafts 7 each having a cam 6 are rotatably supported on the cylinder head 1. A hollow roller support pin 8 is fixed to the center of the swing arm 11, and a cam 6 is attached to the support pin 8.
A roller 9 that is in contact with is rotatably supported.

Further, as is apparent from FIG. 2, a bearing portion 13 for pivotally supporting the cam shaft 7 shown by an imaginary line is provided on the cylinder head 1, and the inside of the cylinder head 1 is also provided. , Two oil supply passages 14 for supplying oil to the HLA 10 are provided so as to extend in the cylinder row direction. As shown in FIG.
4 is opened in the wall surface of the accommodation hole 15 for accommodating the HLA 10. Although a detailed description of the configuration and operation of the HLA 10 is omitted, 16 is a plunger and 17 is a check ball.

The oil in the oil pan, which is pumped by the oil pump, is supplied to the oil supply passage 14 from the cylinder block side. In addition, in order to lubricate the journal portion of the camshaft 7, the oil supply passage 1
An oil passage 18 that branches from 4 and extends upward toward the camshaft 7 is formed, and an upper end of the oil passage 18 is an oil hole 19 that opens into the bearing portion 13.
The bearing portion 13 is formed on a camshaft support block 20 that faces the two swing arms 11 with a slight gap therebetween, and the oil passage 18 is formed in the block 20. . Further, the camshaft support block 20 is formed with a short oil passage 21 which branches from the middle of the oil passage 18 and extends toward the swing arm 11 arranged on both sides of the block 20. Blocks 20 at both ends
Is an oil injection port 22 that opens on both vertical wall surfaces 20a. When the swing arm 11 is in the position shown in FIG. 3 where the cam 6 is not pushed down, the oil injection port 22 faces the hollow portion 8a of the hollow support pin 8 provided on the swing arm 11, and When the swing arm 11 is in the position shown in FIG. 4 in which the swing arm 11 is pushed down by the cam 6, the swing arm 11 is provided so as to face the contact portion between the cam 6 and the roller 9.

On the other hand, a hollow support pin 8 that rotatably supports the roller 9
As shown in FIG. 3 to FIG. 5, the contact surface (bearing surface) between the hollow portion 8a of the support pin 8 and the roller 9 / support pin 8 is penetrated radially through the peripheral wall of the support pin 8. ) Is formed as an oil hole, and a through hole 23 communicating with
A blind plug 24 is fitted into the hollow portion 8a from the side opposite to the oil injection port 22 to close the through hole 23 of the hollow portion 8a on the side opposite to the oil injection port 22 side. The oil injected from the oil injection port 22 toward the inside of the hollow portion 8a is stored in the inside of the hollow portion 8a, and the oil passes through the through hole 23 and the contact surface between the roller 9 and the support pin 8. Is configured to lubricate. When the blind plug 24 is formed as a pointed blind plug 24 'as shown in FIG. 6, the oil injected from the oil injection port 22 hits the slope of the tip of the blind plug 24' toward the through hole 23 side. Since it is guided, the lubrication state of the contact surface between the roller 9 and the support pin 8 becomes better.

As is apparent from the above description, according to the present embodiment, the camshaft support that faces the inside of the hollow portion 8a of the hollow roller support pin 8 provided on the swing arm 11 close to the swing arm 11 is supported. Oil is injected from an oil injection port 22 formed on the wall surface of the block 20 and collected in the hollow portion 8a, and this oil is effectively supplied to the contact surface between the roller 9 and the support pin 8 through the through hole 23. Therefore, the lubrication state between the roller 9 and the support pin 8 can be kept good. Further, since the oil injection port 22 is provided, bubbles contained in the oil supplied to the HLA 10 escape to the atmosphere through the oil injection port 22, so that the function of the HLA 10 can be improved.
Further, the oil injected from the oil injection port 22 is also supplied to the contact surface between the cam 7 and the roller 9 as the swing arm 11 swings.
It is also possible to lubricate between and.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a cylinder head provided with a valve operating device having a lubricating structure according to the present invention, FIG. 2 is a plan view of one cylinder, and FIGS. 5 is a longitudinal sectional view of the swing arm, FIG. 5 is a lateral sectional view of the swing arm, and FIG.
The drawing is a cross-sectional view showing another embodiment of the swing arm. DESCRIPTION OF SYMBOLS 1 ... Cylinder head, 6 ... Cam 7 ... Cam shaft, 8 ... Roller support pin 8a ... Hollow part of roller support pin 9 ... Roller 10 ... Hydraulic lash adjuster (HLA) 11 ... Swing arm, 12 ... Valve 13 ... Cam shaft Bearing part 14 ... Oil supply passages 18, 21 ... Oil passages 20 ... Camshaft support block 22 ... Oil injection port, 23 ... Through hole 24 ... Blind plug

Claims (1)

[Scope of utility model registration request] 1. A swing arm having a hollow support pin and a roller rotatably supported by the support pin and contacting a cam is pivotally supported at one end by a hydraulic lash adjuster provided on a cylinder head. In a valve operating system of an engine configured to oscillate in a state to drive a valve, a camshaft is branched from an oil supply passage provided in the cylinder head for supplying oil to the hydraulic lash adjuster. A first oil passage that extends toward the side, and an oil injection port that branches from the first oil passage and extends toward the swing arm and that can inject oil into the hollow portion of the support pin. 2 oil passages are formed in the cylinder head, and the support pin is provided with a through hole that radially penetrates the peripheral wall of the support pin. Lubricating structure of the valve gear of an engine, characterized in that closing the opposite to the oil injection port side with respect to the through-hole parts.