JPH0541805B2 - - Google Patents

Abstract

PURPOSE:To simplify a lubricating oil supplying means by forming a lubricating oil supplying path in the shaft of a locker in the lubricating oil supplying device in which a plularity of valves are operated respectively by a cam shaft through a locker arm in one part of the plurality of valves and through a tappet in the other part of the same valves. CONSTITUTION:Both ends of a suction side locker shaft 21 (same as the exhaust side locker shaft) and inserted into the supported by a through hole 19, formed in a cylinder head 3 in parallel to the cam shaft 15 while the suction side locker arm 22 is supported pivotally by the same shaft 21. The tappet 25 is attached to the upper end of the valve rod 23 of a central suction valve 8 among the suction valves 7-9 provided on each cylinders while the suction side cam shaft 15 is engaged with the upper surface thereof through a cam. Both of the locker shafts 21, 21, corresponding to both sides suction valves 7, 9, and the cylinder head 3 are formed with the lubricating oil supplying path 30 extending in the same axial line to permit to supply the lubricating oil respectively to the slidingly contacting parts between the locker shaft 21 and the locker arm 22 as well as the same parts between the tappet 26 and a guide hole 26.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a valve mechanism for an engine mounted on a motorcycle or the like, and more particularly to a lubricating oil supply device for this valve mechanism.

(Prior art) In general, the valve operating mechanism of an overhead camshaft engine is of the type in which the camshaft pushes the valve stem via a rocker arm (for example, Japanese Utility Model Publication No. 19361/1973), and in the valve mechanism in which the tappet that slides on the camshaft directly pushes the valve stem. There is a type that pushes a stick (for example, Japanese Utility Model Publication No. 43-23203).

Another example is one in which the above two examples are combined in order to simplify the valve operating mechanism when a large number of valves are provided in the cylinder head. (Patent application filed in 1982 by this applicant)
106181 specification). That is, the cylinder head is provided with a large number of valves, and some of these valves are operated by a camshaft via a rocker arm.
Other valves are actuated by the same camshaft via tappets.

By the way, in the configuration of the above other example, when a lubricating oil supply path is formed in the cylinder head to supply lubricating oil to the pivot portion of the rocker arm or the sliding contact portion between the tappet and the guide hole, the cylinder head does not have an intake hole. The configuration is complicated, as it has many intake and exhaust holes, and the intake valves and exhaust valves are operated by various types that are not standardized. may become complicated.

(Objective of the Invention) This invention was made in view of the above-mentioned circumstances, and is designed so that some of the plurality of valves are operated by a camshaft via a rocker arm, and other parts are operated by a camshaft via a tappet. It is an object of the present invention to simplify a device for supplying lubricating oil to the pivot portion of a rocker arm and the sliding contact portion of a tappet in the constructed engine valve mechanism, and to facilitate the molding operation thereof.

(Structure of the Invention) A feature of the present invention for achieving the above object is that a lubricating oil supply path is formed between each rocker shaft and the cylinder head on the axis of the rocker shaft, and this supply path is The supply passage is connected to the sliding contact portion between the rocker shaft and the rocker arm, and a portion of the supply path is formed to open into the sliding contact portion between the tappet and the guide hole.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIGS. 1 to 4, 1 is a four-stroke engine, 2 is a piston, and 3 is a cylinder head.

The cylinder head 3 has three intake ports 5.
and two exhaust ports 6 are formed, and each of these ports is arranged on a substantially virtual circle centered on the axis of the piston 2. Intake valves 7, 8, and 9 for opening and closing each intake port 5, and exhaust valves 11 and 12 for opening and closing each exhaust port 6 are provided in the cylinder head 3, and each of these valves closes each port. It is urged upward by a spring 13.

An intake side camshaft 15, which is a camshaft, is provided above the intake valve groups 7, 8, and 9, which are made up of a plurality of valves.
On the other hand, an exhaust side camshaft 16 is provided above the exhaust valves 11 and 12. The intake side camshaft 15 and the exhaust side camshaft 16 are respectively linked to a crankshaft (not shown) of the engine 1 via a timing chain device 17.

Two recesses 18, 18 are formed on the upper surface of the cylinder head 3 below the intake side camshaft 15, corresponding to the intake valves 7, 9 on both sides, which are part of the intake valves 7, 8, 9 groups. and these recesses 18,1
A through hole 19 parallel to the axis of the intake camshaft 15 is formed in both side walls forming the camshaft 8, respectively.

Reference numerals 21 and 21 indicate intake side rocker shafts which are a plurality of rocker shafts, and each of these intake side rocker shafts 21, 2
1 are fitted into the through hole 19 on the same axis at a distance from each other, whereby the intake side rocker shafts 21, 21 are supported by the cylinder head 3.

Each intake rocker shaft 21 supports an intake rocker arm 22 which is a rocker arm so as to be vertically movable, and the intake camshaft 15 engages with the intake rocker arm 22.
The rotating end of the intake-side rocker arm 22 contacts the upper end of the valve rod 23 of the intake valves 7 and 9.

The rotation of the intake camshaft 15 causes the intake valves 7 and 9 to open against the elastic force of the spring 13 via the intake rocker arm 22.

Moreover, the intake valves 7, 8, which are the plurality of valves described above,
A tappet 25 is attached to the upper end of the valve stem 23 of the central intake valve 8, which is the other valve in the nine groups.
This tappet 25 is fitted into a guide hole 26 formed in the cylinder head 3 so as to be freely slidable in the axial direction. The intake camshaft 15 engages with the upper surface of the tappet 25, and the rotation of the intake camshaft 15 causes the intake valve 8 to open against the elastic force of the spring 13 via the tappet 25. It will be done.

On the other hand, the exhaust portions 11 and 12 are provided with an exhaust side rocker shaft 27 and an exhaust side rocker arm 28, similar to the above-described intake valves 7 and 9, and the exhaust side cam shaft 16 is cam-engaged with the exhaust side rocker arm 28. ,
The exhaust valves 11 and 12 are opened by the rotation of the exhaust side camshaft 16 via the exhaust side rocker arm 28 against the elastic force of the spring 13.

In FIGS. 2, 3, and 5, the intake rocker shafts 21, 21 are provided on the same axis, and these intake rocker shafts 2
1 and 21 and the tappet 25 are superimposed on each other when viewed in the axial direction of the intake camshaft 15.

On the axis of the intake rocker shaft 21, these intake rocker shafts 21, 21 and the cylinder head 3
A lubricating oil supply path 30 is formed in both. In this case, the supply passage 30 formed in the cylinder head 3 is constituted by a through hole 19 in this embodiment. One end of the supply path 30 is connected to a hydraulic pump (not shown) via an oil path 31 formed in the cylinder head 3, and this hydraulic pump is driven by a crankshaft.

The supply path 30 is connected to each intake side rocker arm 22.
It communicates with the sliding contact portion between the intake side rocker shaft 21 and the intake side rocker arm 22 through a communication path 32 formed in the , and lubricating oil is supplied to this sliding portion.

Further, a portion of the through hole 19, which is a supply path for lubricating oil, is formed so as to open at the sliding contact portion between the tappet 25 and the guide hole 26, and lubricating oil is also supplied to this sliding contact portion. In this case, in order to more smoothly supply lubricating oil to the sliding contact portion between the tappet 25 and the guide hole 26, a circumferential groove communicating with the through hole 19 is provided on the inner peripheral surface of the guide hole 26 in the sliding contact portion. 33
is formed.

FIG. 5 shows a state in which the intake camshaft 15 pushes the tappet 25 to open the intake valve 8. When the intake valve 8 assumes a fully open position, the supply path 3
0 and the circumferential groove 33 are configured to open toward the upper surface of the tapepet 25. Lubricating oil is supplied to the sliding contact portion between the intake camshaft 15 and the tappet 25 through this opening.

(Effects of the Invention) According to the present invention, when supplying lubricating oil to the sliding contact portion between the rocker shaft and the rocker arm, and the sliding contact portion between the tappet and the guide hole, the plurality of rocker shafts supported by the cylinder head are used. Since the lubricating oil supply paths are formed coaxially with each rocker shaft and cylinder head on this axis, the arrangement of the rocker shafts and the formation of the supply paths are processed on one axis. The structure of the device for supplying lubricating oil is simplified, and forming operations such as drilling of the supply channel are also facilitated.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is an overall plan view of the valve mechanism, Fig. 2 is a sectional view taken along the - arrow in Fig. 1, and Fig. 3 is a sectional view taken in the - arrow direction in Fig. 1. A sectional view, Fig. 4 is a sectional view taken along the - line in Fig. 3, and Fig. 5 is a sectional view taken along the - line in Fig.
The figure is a partial side sectional view of the tappet being pushed by the intake side camshaft to open the intake port. 1...Engine, 3...Cylinder head, 7,
9...Intake valve (some valves), 8...Intake valve (other valves), 15...Intake side camshaft (camshaft), 19...
...Through hole (supply path), 21...Intake side rocker shaft (Rocker shaft), 22...Intake side rocker arm (Rocker arm), 25... Tappet, 26...
Guide hole, 30... supply path.

Claims (1)

[Scope of Claims] 1. A cylinder head is provided with an intake valve and an exhaust valve, a plurality of at least one of these valves is provided, and a camshaft is provided above a valve group made up of the plurality of valves. A rocker shaft is supported on the cylinder head, and a rocker arm is pivotally supported by these rocker shafts, and some of the valves of the above valve group are operated by a camshaft via these rocker arms, while some of the valves of the same valve group are operated by a camshaft via these rocker arms. A tappet is attached to the other valve, and this tappet is fitted into a guide hole formed in the cylinder head so as to be slidable in the axial direction, and the valve is operated by sliding contact of the same camshaft with the tappet, In an engine valve operating mechanism in which the rocker shaft and the tappet are superimposed on each other when viewed in the axial direction of the camshaft, lubricating oil is supplied to the rocker shaft and the cylinder head on the axis of the rocker shaft. A passage is formed, and this supply passage is communicated with the sliding contact part of the rocker shaft and the rocker arm, and a part of the supply passage is formed so as to open into the sliding contact part of the tappet and the guide hole. A lubricating oil supply device for a valve train.