JPH04269330A - Internal combustion engine - Google Patents

Abstract

PURPOSE:To make smaller the length of a V-type engine in the width direction than a customary one, improve the external view of the V-type engine, miniaturize the V-type engine, and reduce restrictions at loading it on a vehicle. CONSTITUTION:Cylinder head covers respectively covering a first and a second valve systems 44 of an internal combustion engine are provided on the upper part of a cylinder head, and a receiving recessed part 78 is formed on the cylinder head cover. A cover part 80 covering the receiving recessed part is provided, and it is constituted so as to make small the length of the internal combustion engine in the direction meeting at right angles with the lengthwise direction of the engine, by projecting the cover part and the cylinder head cover into a nearly triangular section on the upper part of the cylinder head.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION This invention relates to an internal combustion engine, and more particularly, a first bank cylinder and a second bank cylinder are arranged in a V-shape in a cylinder block, and first and second valve mechanisms are arranged in a cylinder head. The present invention relates to an internal combustion engine that is a V-type engine equipped with the following.

0002

2. Description of the Related Art Internal combustion engines include in-line engines, opposed engines, V-type engines, etc., depending on the arrangement of cylinders. In this V-type engine, a first bank cylinder and a second bank cylinder are arranged in a V-shape in a cylinder block with a predetermined angle between them.

[0003] Engines, particularly four-stroke engines, are equipped with an intake valve and an exhaust valve to intake air into and exhaust air from the combustion chamber. These valves include side valve types and overhead valve types. The valve operating mechanisms that drive these valves, such as overhead valve operating mechanisms, include those equipped with seesaw-type or swing-type rocker arms to transmit the movement of the cam of the camshaft to the valves. .

A seesaw-type rocker arm is swingably supported by a rocker shaft at its intermediate portion, and has one end in sliding contact with a cam of a camshaft and the other end in contact with a valve stem. The swing type rocker arm is pivotally supported by the pivot portion at one end, slidably contacts the cam of the camshaft at the intermediate portion, and abuts against the valve stem at the other end. Note that some valve operating mechanisms for overhead valve type valves include a direct drive type in which a valve stem is directly driven by a cam of a camshaft.

[0005] Also, for internal combustion engines, Japanese Patent Application Laid-Open No. 1-1930
There is one disclosed in Publication No. 09. The rocker arm device for a four-cycle engine disclosed in this publication has a rocker shaft that pivotally supports one rocker arm, which is provided with an oil supply hole and an air vent hole, as well as a horizontal hole, and a pivot provided at the upper end of the horizontal hole. By inserting a tappet and supporting the base end of the other rocker arm on the pivot, it is not necessary to install a hydraulic tappet to the cylinder head or provide an oil supply hole, which simplifies the shape cutting of the cylinder head and makes manufacturing easier. Keeping costs low.

Furthermore, there is one disclosed in Japanese Patent Application Laid-Open No. 1-280605. The cylinder head of the multi-cylinder engine disclosed in this publication constitutes a cylinder head for a valve train in which the formation position of the intake valve and the formation position of the exhaust valve in the width direction orthogonal to the longitudinal direction of the cylinder head are fixed, Regardless of the number of intake and exhaust valves, the external shape of the cylinder head and processing equipment are standardized, and the parts used are also standardized, reducing costs.

[0007]

[Problems to be Solved by the Invention] In the conventional internal combustion engine, the first and second cylinder heads disposed above the first and second bank cylinders, respectively, have cylinders that are lidded, bottomless, and square in cross section. First and second cylinder head covers are respectively attached. The first and second valve operating mechanisms are covered by these first and second cylinder head covers.

[0008] Also, a high tension cord for a spark plug is wired from the upper part of the first and second cylinder head covers. And this high tension cord is
For example, in the DOHC specification, it is wired between cams.

As a result, the plug cap for the ignition plug and the high tension cord protrude from the cylinder head cover, increasing the length in the width direction perpendicular to the longitudinal direction of the internal combustion engine, which is disadvantageous in terms of appearance and also increases in size. There are many restrictions when mounting on a vehicle, which is disadvantageous in terms of practical use.

0010

[Means for Solving the Problems] Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides a first bank cylinder and a second bank cylinder.
In an internal combustion engine having a cylinder block in which a bank cylinder is arranged in a V-shape and a cylinder head in which first and second valve mechanisms are respectively arranged, the cylinder covers the first and second valve mechanisms, respectively. A head cover is provided on the upper part of the cylinder head, a storage recess is formed in the cylinder head cover, a cover part is provided to cover the storage recess, and the cover part and the cylinder head cover protrude from the upper part of the cylinder head to have a substantially triangular cross section. It is characterized in that the length in the width direction perpendicular to the longitudinal direction is made small.

[0011]

[Operation] With the invention as described above, the cover part and the cylinder head cover are made to protrude from the upper part of the cylinder head in a substantially triangular cross-section, thereby reducing the length in the width direction perpendicular to the longitudinal direction of the internal combustion engine, thereby improving the external appearance. In addition, it can be made smaller and has fewer restrictions when mounted on a vehicle, which is advantageous in practice.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 10 show an embodiment of the present invention. In FIG. 2, 2 is an internal combustion engine, for example a V-type engine. This V-type engine 2 has an oil pan 6 attached to the lower surface of a V-shaped cylinder block 4, and first and second cylinder heads 8-1 and 8-2, respectively, and first and second cylinder heads 8-1 and 8-2, respectively, to the upper surface. Cylinder head cover 1
0-1 and 10-2 are attached. The first cylinder head 8-1 and the first cylinder head cover 10-
A second cylinder head 8-2 and a second cylinder head 8-2 are disposed on one side of the V-type engine 2 (on the right side in FIG. 2).
The cylinder head cover 10-2 is connected to the V-type engine 2.
It is arranged on the other side (left side in FIG. 2).

[0014] The first and second cylinder heads 8-1, 8
-2, the V-shaped first and second bank cylinders 12-1 and 12-2 are arranged.
, a space 14 is formed between the second bank cylinders 12-1 and 12-2. An intake manifold 16 that communicates with the first and second cylinder heads 8-1 and 8-2 is disposed in this space 14.

[0015] The first and second cylinder heads 8-1, 8
-2 and first and second bank cylinders 12-1, 12-2
are disposed approximately symmetrically with respect to the longitudinal direction of the V-type engine 2, so that one first cylinder head 8-
Only the configuration on the 1st and 1st bank cylinder 12-1 sides will be described.

A combustion chamber 20 formed by the cylinder block 4 and the piston 18 is provided, and an intake port 22 and an exhaust port 24 communicating with this combustion chamber 20 are provided.

An intake valve spring 34 and an exhaust valve spring 36 are provided on the intake valve stem 30 and exhaust valve stem 32 of the intake valve 26 and the exhaust valve 28 that open and close the intake port 22 and the exhaust port 24, respectively. An abutment portion 38 and an exhaust valve stem abutment portion 40 are provided.

Valve chamber 4 of the first cylinder head 8-1
2, a camshaft 46 rotated by the V-type engine 2 is rotatably supported on the first cylinder head 8-1 by a cam cap 48, and the valve mechanism 44 provided on the camshaft 46 is A swing-type intake rocker arm 54 is provided by the intake cam 50 and exhaust cam 52, respectively.
and drives the seesaw type exhaust rocker arm 56.

The swing-type intake rocker arm 54 is provided with a pivot portion 60 on one end thereof, which is pivoted to a hydraulic valve lash adjuster 58 for adjusting valve clearance.
A sliding contact portion 62 that slides on the intake cam 50 is provided in the intermediate portion,
An abutting portion 64 that abuts the intake valve stem abutting portion 38 is provided on the other end side.

The seesaw type exhaust rocker arm 56 is
A shaft support 68 that is swingably supported by a rocker shaft 66 is provided in the middle part, a sliding contact part 70 that is in sliding contact with the exhaust cam 52 is provided at one end, and a hydraulic type for adjusting valve clearance is provided at the other end. A valve lash adjuster 72 is provided.

Inside the first cylinder head cover 10-1, a breather chamber 74 is provided which is divided from the valve operating chamber 42, and a breather pipe 76 is provided which connects the breather chamber 74 to the intake system.

[0022] Also, the first cylinder head cover 10
-1 is the storage recess 78 as shown in FIGS. 1 and 4 to 10.
At the same time, a cover part 80 is provided to cover the storage recess 78, and the cover part 80 and the first cylinder head cover 10-1 protrude above the first cylinder head 8-1 in a substantially triangular cross-section to form the V-shape. The length of the engine 2 in the width direction perpendicular to the longitudinal direction is made small.

Specifically, the first cylinder head cover 10-1 is formed into a substantially triangular cross section, and the first cylinder head cover 10-1 is formed into a substantially triangular cross section.
A storage recess 78 is formed in the center of the cylinder head cover 10-1 on the side facing the breather chamber 74. Further, a part of a plug cap 82 for a spark plug (not shown) and a high tension cord (not shown) are disposed in this storage recess 78, and these plug caps 82
A cover portion 80 is provided that covers the high tension cord and the high tension cord and is substantially flush with the outer surface 10f-1 of the first cylinder head cover 10-1.

When attaching the first and second cylinder head covers 10-1 and 10-2 to the V-type engine 2, the length L in the width direction of the V-type engine 2 is made small as shown in FIG. There is.

Next, the operation will be explained.

When the first and second cylinder head covers 10-1 and 10-2 are attached to the upper parts of the first and second cylinder heads 8-1 and 8-2 of the V-type engine 2,
Storage recess 7 of cylinder head covers 10-1 and 10-2
A plug cap 82 and a high-tension cord (not shown) are located inside the plug cap 8 .

Then, the cover portion 80 is attached to cover the storage recess 78, and the first and second cylinder head covers 10-
It is substantially flush with the outer surfaces 10f-1 and 10f-2 of 1 and 10-2.

As a result, the length L in the width direction of the V-type engine 2 becomes smaller than that of the conventional engine, and as shown in FIG. 2, there is no protruding part, and the appearance of the V-type engine 2 can be improved.

Furthermore, since the length L in the width direction of the V-type engine 2 is reduced, the V-type engine 2 can be made smaller than the conventional one, and space can be saved when mounted on a vehicle. It is possible to reduce restrictions and improve the workability of mounting work, which is advantageous in practice.

[0030]

As described in detail above, according to the present invention, a cylinder head cover that covers the first and second valve mechanisms of an internal combustion engine is provided on the upper part of the cylinder head, and a housing recess is formed in the cylinder head cover. A cover part that covers the storage recess is provided, and the cover part and the cylinder head cover protrude from the upper part of the cylinder head in a substantially triangular cross-section to reduce the length in the width direction perpendicular to the longitudinal direction of the internal combustion engine. The length of the V-type engine in the width direction is smaller than that of the conventional engine, and there is no protruding part, so the appearance of the V-type engine can be improved. Furthermore, since the length of the V-type engine in the width direction is reduced, the V-type engine can be made smaller, and restrictions on mounting on a vehicle can be reduced, which is advantageous in practice.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a first cylinder head and a first cylinder head cover showing an embodiment of the present invention.

FIG. 2 is a schematic diagram of a V-type engine.

FIG. 3 is a plan view of the first cylinder head.

FIG. 4 is a plan view of the first cylinder head cover.

FIG. 5 is a front view of the first cylinder head cover.

FIG. 6 is a bottom view of the first cylinder head cover.

FIG. 7 is a left side view of the first cylinder head cover.

FIG. 8 is a right side view of the first cylinder head cover.

FIG. 9 is a sectional view taken along the line ⓓ-ⓓ of FIG. 4;

FIG. 10 is a sectional view taken along the line ⓓ-ⓓ of FIG. 4;

[Explanation of symbols]

2 V-type engine 4 Cylinder block 8-1 First cylinder head 8-2 Second cylinder head 10-1 First cylinder head cover 10-2 Second cylinder head cover 12-1 First bank cylinder 12-2 Second bank cylinder 14 Space portion 44 Valve mechanism 74 Breather chamber 76 Breather pipe 78 Storage recess 80 Cover portion 82 Plug cap

Claims (1)

[Claims] 1. An internal combustion engine having a cylinder block in which a first bank cylinder and a second bank cylinder are arranged in a V-shape, and a cylinder head in which first and second valve mechanisms are respectively arranged. 1. A cylinder head cover covering each of the second valve mechanisms is provided on the upper part of the cylinder head, a storage recess is formed in the cylinder head cover, a cover part is provided to cover the storage recess, and the cover part and the cylinder head cover are connected to the cylinder head. 1. An internal combustion engine, characterized in that the internal combustion engine is configured to protrude from an upper portion in a substantially triangular cross-section so as to reduce the length in a width direction perpendicular to a longitudinal direction of the internal combustion engine.