JPS60147520A - Lubricating oil supplying device in valve moving mechanism - 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 the valve operating mechanism of an overhead camshaft engine, there is a type in which the camshaft pushes the valve stem via a rocker arm (for example, Japanese Utility Model Publication No. 43-19361), and a type in which the camshaft slides into contact with the camshaft. A type where the tappet directly pushes the valve stem (for example, Utility Model 43-2
3203).

Another example is a combination of the above two examples in order to simplify the valve mechanism when a large number of valves are provided in the cylinder head (patent application filed by this applicant). Specification No. 106181/1981). That is, a large number of valves are provided in the cylinder head, and some of these valves are operated by a camshaft via a rocker arm, and other valves are operated by the same camshaft via tappets. .

By the way, in the configuration of the other example above, when forming a lubricating oil supply path 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 has a large number of intake holes and exhaust holes, and the intake valves and exhaust valves are operated by various types that are not unified, so the configuration is complicated and the supply path is complicated. There is a possibility that the molding operation becomes complicated.

(Object of the Invention) This invention was made by paying attention to the circumstances as described in 2.
In an engine valve mechanism configured to be operated by a camshaft via another part or tappet, the device for supplying lubricating oil to the pivot part of the mouth and anchor arm and the sliding contact part of the tappet is simplified, and The purpose is to facilitate the molding work.

(Structure of the Invention) A feature of the present invention for achieving the above object is that the rocker shafts are coaxially provided, and a lubricating oil supply path is formed between each rocker shaft and the cylinder head by this shaft. The supply channel is connected to the sliding contact portion between the rocker shaft and the rocker arm, and a part of the same supply channel is formed to open into the sliding contact portion between the tappet and the guide hole. It is at the point.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

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

Three intake boats 5 and two exhaust ports 6 are formed in the cylinder head 3, and each of these ports is connected to a screw I.
・It is arranged on a substantially virtual circle centered on the axis of the ring 2. Intake valves 7 and 8' open and close each intake port 5.
, 9, and an exhaust valve 11.1 for opening and closing each exhaust port 6.
2 are provided in the cylinder head 3, and each of these valves is urged upward by a spring 13 so as to close each boat.

An intake camshaft 15 is provided above the intake valves 7, 8.9, while an antagonistic cam i4b 16 is provided above the exhaust valve 11.12. These intake side camshafts 15
and the exhaust side camshaft 16 are respectively linked to a not-shown crankshaft of the engine 1 via a timing chain device 17.

On the upper surface of the cylinder head 3 below the intake side camshaft 15 are intake valves 7, 9 on both sides of the intakes 07, 8, 9.
Two four portions 18.18 are formed corresponding to the four portions 18.18, and a through hole 19J parallel to the axis of the intake camshaft 15 is formed in both side walls forming each of the four portions 18.18.

21 is an intake side rocker shaft, both ends of which are connected to the through hole 19.
The intake side rocker @I+ 21 is thereby supported by the cylinder head 3. The intake side port/linker arm 22 is pivotally supported by each of these intake side lockers 41121 so as to be vertically movable, and the intake side camshaft 15 is cam-engaged with the intake side rocker arm 22.
The rotating end of the intake side rocker arm 22 is connected to the intake valve 7.
.

The rotation of the intake side camshaft 15 causes the intake valves 7.9 to move to the spring 13 via the intake side rocker arm 22.
The opening operation is made against the elastic force of.

Also, the valve stem 2 of the central intake valve 8 among the intake valves 7, 8.9
A tappet 25 is attached to the upper end of 3. 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. Then, the intake side cam 15 engages with the upper surface of the tappet 125,
This rotation of the intake side camshaft 15 causes the two-stage intake valve 8 to open via the tappet 25 against the elastic force of the spring 13.

On the other hand, the above-mentioned intake valve 7,
9, an exhaust side rocker shaft 27 and an exhaust side rocker arm 28 are provided, and the exhaust side camshaft 16 is cam engaged with the exhaust side rocker arm 28, and the exhaust side rocker arm is rotated by the rotation of the exhaust side camshaft 16. These exhaust valves 11.1 through 28
2 is caused to open against the force of the spring 13.

In the above configuration, especially with reference to FIGS. 1 and 2, the intake side rocker shafts 21, 21 corresponding to the intake valves 7 and 9 on both sides are coaxially provided, and on this axis, these intake valves are A lubricating oil supply path 30 is formed between the side rocker shafts 21, 21 and the cylinder head 3. In this case, in this embodiment, the supply passage 30 formed in the cylinder head 3 is
9; one end of the supply passage 30 is connected to a hydraulic pump (not shown) via an oil passage 31 formed in the cylinder head 3, and this hydraulic pump is driven by a crankshaft.

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

Further, a portion of the through hole 19, which is a supply path for lubricating oil, is formed so as to open at a 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 side camshaft 15 pushes the tappet 25 to open the intake valve 8.
The supply path 30 and the circumferential groove 33 are configured to open toward the upper surface of the tappet 25 when the tappet takes a fully open position. Then, lubricating oil is supplied to the sliding contact portion between the intake side camshaft 15 and the tappet 25 through this opening.

Although the above is based on the illustrated example, the configuration of the present invention may be applied to the exhaust valves 11 and 12 side.

(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 or the sliding contact portion between the tappet and the guide hole, a plurality of The rocker shafts are coaxially arranged, and a lubricating oil supply path is formed between each rocker shaft and the cylinder on this shaft, so the arrangement of the rocker shafts and the formation of the supply path can be done on one axis. Therefore, the structure of the device for supplying lubricating oil can be simplified, and forming operations such as drilling of the supply channel can also be facilitated.

[Brief explanation of the drawing]

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 cross-sectional view taken along the line II-II ill in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line m- ■A sectional view taken along the line, Fig. 4 is a sectional view taken along the line IV-IV in Fig. 3, and Fig. 5 is a partial side sectional view of the state in which the tappet is pushed by the intake side camshaft and the intake port is opened. It is a diagram. 1. Engine, 3. Cylinder, 7° 8.9
・Intake valve, l 1 , 12 ・Exhaust valve, 15 ・Intake side camshaft (camshaft), 19 ・Fist through hole (supply path), 21
・・Intake side rocker shaft (mouth/linker axis), 22・Pa intake side rocker arm (rocker arm), 25・・Tappet, 26″・・Guide hole, 30・Fist supply path. Patent applicant Yamaha Motor Co., Ltd. Company Figure 4 Figure 5 23

Claims (1)

[Claims] 1. The cylinder head is provided with a plurality of intake valves and exhaust valves, a camshaft is provided above these valves, a plurality of rocker shafts are supported on the same cylinder head, and each of these rocker shafts・The rocker arm is pivotally supported, and some of the valves are actuated by a camshaft via these rocker arms, while tappets are attached to other valves, and these tappets are formed in the cylinder head. In an engine valve mechanism, the valve is fitted into a kite hole so as to be slidable in the axial direction, and the valve is operated by the sliding contact of the camshaft with the tappet, in which each rocker shaft is provided coaxially. A supply path for lubricating oil is formed between each rocker shaft and the cylinder head, and this supply path is communicated with the sliding contact portion of the rocker shaft and the rocker arm, and a portion of the supply path is connected to the tappet. A lubricating oil supply device for a valve mechanism, characterized in that it is formed to open at a sliding contact portion of a guide hole.