JPS61277810A - Oil feeding apparatus in tappet mechanism equipped with hydraulic tappet for internal-combustion engine - Google Patents

Abstract

PURPOSE:To permit the certain and smooth operation of a tappet mechanism by installing the first oil feeding system which supplies oil into a hydraulic tappet and the bearings of tappet cam shafts and the second oil feeding system which supplies oil into the connection part between tappet cams and cam followers. CONSTITUTION:A suction valve 8 and an exhaust valve 9 are opening/closing- driven in a prescribed timing by a tappet mechanism 11 equipped with a hydraulic tappet 10. The first oil feeding system L1 which supplies working oil into the hydraulic tappet 10 and supplies lubricating oil into the bearings 27 and 28 of the tappet cam shafts 17 and 18 and the second oil feeding system L2 for supplying lubricating oil into the connection part between the tappet cams 19 and 20 and the cam followers 15 and 16 are installed onto a cylinder 2. Thus, the certain and smooth operation of the tappet mechanism equipped with hydraulic tappet can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION A0 OBJECTS OF THE INVENTION (1) Industrial Field of Application The present invention relates to a lubricating device for a valve mechanism with a hydraulic tappet and throat for an internal combustion engine.

(2) Prior Art In a conventional valve mechanism with a hydraulic tappet, a lubricating device for the hydraulic tappet is disclosed in, for example, Japanese Utility Model Application No. 12607/1983.

(3) Problems to be solved by the invention In the oil supply system for a valve mechanism with hydraulic tappet,
The hydraulic oil that operates the hydraulic tappets and the lubricating oil that lubricates the bearings of the valve camshaft of the valve train require a small amount of oil, but they must be relatively high-pressure oil. The lubricating oil supplied to the joint between the valve train cam and the cam follower may have a low oil pressure, but the amount of oil needs to be relatively large, and all these oils must be supplied by the same oil supply system. If you try to The problem is that it tends to decrease.

Therefore, the present invention solves the above problems by supplying a small amount of high pressure oil to the bearings of the hydraulic tappet and the valve camshaft, and supplying a large amount of low pressure oil to the connecting part between the valve cam and the cam follower. It is an object of the present invention to provide a refueling device for a valve mechanism with a hydraulic tappet for an internal combustion engine, which has a simple structure and can solve the problems.

B0 Structure of the Invention (1) Means for Solving the Problems According to the present invention, in order to achieve the above object, a hydraulic tappet is attached to the head of the engine body, and this hydraulic tappet is connected to the valve drive camshaft. In a hydraulic tappet action valve mechanism that is connected to an intake valve or an exhaust valve via a cam follower that swings in conjunction with a valve cam, the hydraulic tappet and the valve operating cam are connected to the head of the engine body. A first oil supply system for supplying oil to the bearing of the shaft and a second oil supply system for supplying oil to the connecting portion between the valve operating cam and the cam follower are separately provided.

(2) Effect According to the above configuration, a relatively small amount of high pressure oil is supplied from the first oil supply system to the bearing portion of the hydraulic tappet and the valve drive camshaft,
Further, a relatively large amount of low pressure oil can be supplied to the connecting portion between the valve operating cam and the cam follower.

(3) Embodiments Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

The engine body E of the DOHC type 4-valve 4-stroke internal combustion engine is
The cylinder block 1 includes a cylinder block 1 and a cylinder head 2 superimposed on the cylinder block 1 via a gasket 3, which are joined together by a plurality of head bolts 4 (FIG. 3).

The cylinder head 2 of the engine body E is formed with a combustion chamber 5 and intake and exhaust ports 6.7 opening into the combustion chamber 5.
These ports 6, 7 are respectively opened and closed by intake and exhaust valves 8.9 supported on the cylinder rad 2 so as to be movable up and down.

The intake and exhaust valves 8 and 9 are each driven to open and close at predetermined timing by a valve operating mechanism 11 equipped with a hydraulic tappet IO.

The valve operating mechanism 11 is provided within a valve operating chamber 12 formed on the upper surface of the cylinder head 2 .

The valve mechanism 11 with the hydraulic tappet 10 has a conventionally known structure, and two pairs of V-shaped support holes 13 are formed for each cylinder in the center of the cylinder head 2. Hydraulic tappets 10 . . . are respectively installed in the support holes 13 . One end of a suction/exhaust cam follower 15 or I6 is connected to the operating end of each hydraulic tappet 10, that is, the spherical upper end of the plunger 14, and the other end of the cam follower 15, 16 is connected to the valve spring 21, 21.
suction and exhaust valves 8, each biased in the valve closing direction by
9 is engaged with the upper end. Valve drive cams 19 and 20 of a pair of valve drive cam shafts 17 and 18 are connected to the slipper surfaces formed on the upper surfaces of intermediate portions of the intake and exhaust cam followers 15 and 16, respectively. The rotation and cooperation with the valve springs 21.22 open and close the intake and exhaust valves 8.9 at predetermined timings. A pair of valve drive camshafts 17 and 18 for intake and exhaust are connected to bearing halves 23 and 24 on the cylinder head 2 and bearing caps 25 and 2 fixed thereon.
6 and are rotatably supported by bearings 27 and 28, respectively.

The cylinder 2 is supplied with hydraulic oil to the hydraulic tappets 10, . . . and the bearings 27.
a first oil supply system L + for supplying lubricating oil to 2#;
A second oil supply system L2 is separately provided for supplying lubricating oil to the connecting portion between the valve drive cam 19.20 and the cam follower 15.16.

As shown in FIG. 3, a portal-shaped oil supply frame 30 is mounted on the cylinder head 2 at its longitudinally intermediate portion via an oil seal, and this oil supply frame 30 connects the cylinder head 2 to the cylinder block 1. It is fixed onto the cylinder head 2 using two head bolts 4 for fixing. An oil feed passage 31 that also serves as a through hole for the head bolt 4 is formed in the vertical direction on one side of the cylinder head 2 and the oil supply frame 30. Closed by. Further, the lower end of the oil feed passage 31 is communicated with the hydraulic pump P via a block side oil passage 32 bored in the cylinder block l.

The oil feed path 31 includes the first. Second oil supply system Ll.

L2 is connected in parallel.

Next, the specific structure of the first oil supply system L1 will be explained with reference to Figs. 1 to 3.5. It is equipped with two vertical oil passages 33, 33 extending horizontally in the direction, and a substantially horizontal horizontal oil passage 34 that intersects with the central part of the vertical oil passages 33, 33 and communicates with them. The passage 34 communicates with the oil feed passage 31, and a first oil jet 46 is provided in the communication portion. The two vertical oil passages 33, 33 are
A plurality of support holes 13 for supporting hydraulic tappets 10, respectively, are traversed by the holes 13.
. . , and both ends of their vertical oil passages 33 and 33 are closed by blind plugs 35 .

Further, from the pair of vertical oil passages 33, 33, there are a plurality of branch oil passages 3 corresponding to the bearings 27..., 28... of the valve train camshaft 17.
6..., 37... (Fig. 2) are branched, and these oil passages 36..., 37... are directed towards bearings 37..., 38..., respectively. They extend obliquely upward, and their open ends are connected to the bearings 27..., 28.
It communicates with the bearing surface of...

An air bleed passage 3 that opens into the valve operating chamber 12 is provided at the upstream end of the horizontal oil passage 34 that extends outward from the oil feed passage 31.
8 are communicated with each other, and an air bleed plug 39 is screwed into this air bleed passage.

Further, a relief valve 40 is inserted into the downstream end of the horizontal oil passage 34 that extends outward from the other vertical oil passage 33, and this relief valve 40 has a piston 42 that opens and closes the relief hole 41, It is composed of a valve spring 43 that biases the piston 42 in the direction in which the relief hole 41 is closed.

Next, the second oil supply system L2 will be explained with reference mainly to FIGS. Two extending oil supply pipes 44, 44,
A horizontal oil passage 45 is provided in the upper part of the oil supply frame 30 substantially horizontally and communicates the two oil supply pipes 44, 44 with each other at approximately right angles, and the horizontal oil passage 45 is an oil supply passage. 31
A second oil jet 47 is provided at the communicating portion.

The middle portions of the two oil supply pipes 44, 44 are supported through support pieces 48, 48 that protrude upward from the cylinder head 2, and both ends of these oil supply pipes 44, 44 are closed. As shown in FIG.
A plurality of oil supply nozzles 49 are drilled corresponding to the connection parts of No. 6 and oriented toward the connection parts, and a second
Two oil supply pipes 44°4 pass through the oil jet 47
The pressure oil flowing through the joints 4 is injected into the connecting portion through the oil supply nozzles 49 .

Next, the operation of this embodiment will be explained. When the pair of valve drive camshafts 17, 18 are rotated due to engine operation, the intake and exhaust cams 19, 20 are rotated, and the valve springs 21, 22 are rotated.
Due to the elastic force of the cam follower 15.16, the cam follower 15.16 swings up and down using the joint with the hydraulic tappet 10.10 as a fulcrum, and the intake and exhaust valves 8.9 slide up and down and are opened and closed at predetermined timing. .

Further, a part of the pressure oil from the hydraulic pump P driven by the operation of the engine flows from the block side oil passage 32 to the oil feed passage 35.

The pressure oil in the oil feed path 31 is the first. 2nd oil jet) 46.
47 and the 1st. It is distributed and supplied to the second oil supply system, L2. In this case, the amount of oil supplied to the second oil supply system L2 is
The amount of oil is adjusted to be greater than the amount of oil supplied to the oil supply system L1.

The oil that has flowed into the first oil supply system L1 flows through two vertical oil passages 33 and 33.
From there, the oil is supplied to the hydraulic tappets 1-10 through the support holes 13, and at the same time, it also flows into the plurality of branch oil passages 36, 37, and from there, oil is supplied to the hydraulic tappets 1-10. The bearings 2°7..., 28... of the valve camshafts 17, 18 are supplied with oil to lubricate them.

On the other hand, the oil flowing into the second oil supply system L2 flows through two oil supply pipes 4.
4.44, from which multiple refueling nozzles 49
... through each valve train cam 19.20 and cam follower 1
5.16 can be injected into the joint to lubricate the joint.

C1 Effects of the Invention As is clear from the above examples, according to the present invention,
The head of the engine body is provided with a first oil supply system for supplying oil to the hydraulic tappet and the bearing part of the valve drive camshaft, and a second oil supply system for supplying oil to the connecting part between the valve drive cam and the cam follower. Since it was established separately, the above-mentioned 1. By appropriately setting the specifications of the second oil supply system, the bearings of the hydraulic tappet and valve drive camshaft, which require a small amount of oil but require high oil pressure, can be
Oil that meets these requirements can be supplied through the first oil supply system, and the connection between the valve drive cam and cam follower, which requires a large amount of oil even though the oil pressure may be low, is connected to the second oil supply system. Through this system, we can supply oil that meets these requirements, ensuring the operation of the hydraulic tappet, and increasing the lubricity of the bearing part of the valve train camshaft and the connection part between the valve train cam and the cam follower, and improving the overall performance. It is possible to accurately and smoothly operate the valve mechanism with hydraulic pressure control.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the device of the present invention, in which FIG. 1 is a longitudinal sectional view of the head of the engine body taken along the line nn in FIG. 4, and FIG. 3 is a longitudinal sectional view of the engine main body head along line nn, FIG. 4 is a longitudinal sectional view of the engine main body along line m-m in FIG. 4, FIG. FIG. 3 is a cross-sectional view taken along the line V-V in FIG. E...Engine body, L,, L2゛...1st. 2nd oil supply system, 8... Intake valve, 9... Exhaust valve, 10... Hydraulic tappet, 15.16... Cam follower, 17.18
...Valve drive cam shaft, 19.20...Valve drive cam, 26.
...-Bearing cap, 27...Bearing patent Applicant: Honda Motor Co., Ltd.
Chinichi Machine Industry Co., Ltd. °:,; and”, −1−゛

Claims (1)

[Claims] A hydraulic tappet is attached to the head of the engine body, and this hydraulic tappet is connected to the intake valve or exhaust valve via a cam follower that swings in conjunction with the valve driving cam on the valve driving cam shaft. In the valve train with a tappet, the head of the engine body includes a first oil supply system for supplying oil to the hydraulic tappet and the bearing of the valve train camshaft, and a connecting part between the valve train cam and the cam follower. 1. A refueling device for a valve mechanism with a hydraulic tappet for an internal combustion engine, characterized in that a second refueling system for refueling is separately installed.