JPH01280605A - Cylinder head for multicylinder engine - Google Patents

Abstract

PURPOSE:To improve versatility and reduce cost in forming the title cylinder head by constituting the cylinder head for a valve system so as to fix the positions of intake and exhaust valves in the widthwise direction perpendicularly crossing to the lengthwise direction of the cylinder head. CONSTITUTION:A camshaft 10 provided with cams 8 in one body is journaled in a cylinder head 4, and the camshaft 10 is wrapped with a cam cap 12. Each one part of a first and second rocker arms 14, 22 provided every cylinder is contacted with the cam 8, and intake and exhaust valves 20, 26 are opened or closed by swing motion of respective rocker arms 14, 22. In a valve system 28 constructed like the above-stated, when the forming position of the intake valve 20 and the exhaust valve 26 are fixed in the widthwise direction crossing the lengthwise direction of the cylinder head 4, the cylinder head 4 is used in common independent of the number of the intake and exhaust valves 20, 26.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to the cylinder head of a multi-cylinder engine, and in particular, the cylinder head is provided with a valve mechanism, and this valve mechanism operates the intake and exhaust valves provided in each cylinder. The present invention relates to a cylinder head of a multi-cylinder engine configured to open and close.

[Conventional technology]

A multi-cylinder engine has multiple cylinders formed by a cylinder head and a cylinder block, and parts such as intake valves, exhaust valves, and spark plugs are attached to the cylinder head for each cylinder, and the cylinder head also operates the intake and exhaust valves. A valve mechanism is provided to cause the valve to move. This valve operating mechanism uses a camshaft rotated by an engine to press each valve stem end of the intake and exhaust valves to open and close the intake and exhaust valves. As for the valve mechanism, a rocker arm type, a direct type, or a swing arm type is used depending on the intake and exhaust valves used in the cylinder.

In addition, the difference between the cylinder head and the cylinder block is that the combustion of the air-fuel mixture is completed approximately near the top dead center of the piston, so the amount of heat it receives is greater than that of the cylinder block, and there are no sliding parts with the piston, etc. , aluminum alloy castings are mainly used because they have excellent heat dissipation properties and are lightweight.

Some cylinder heads are disclosed in Japanese Patent Publication No. 49-15162. The reciprocating internal combustion engine disclosed in this publication employs an oscillating motion for the exhaust valve, which is less severe, and a direct cam motion for the intake valve, using an Oha Hesodo camshaft device that increases the degree of freedom in design. We are making it happen.

Further, there is one disclosed in Japanese Patent Application Laid-Open No. 135309/1983. The hemispherical combustion chamber cross-flow V-shaped valve arrangement center spark plug 5OHC engine disclosed in this publication has two cams on one camshaft, one cam opens and closes the exhaust valve, and the other cam opens and closes the exhaust valve. The intake valve is opened and closed via the rocker arm.

[Problem that the invention seeks to solve]

Incidentally, in the cylinder head of a conventional multi-cylinder engine, the same number of intake valves and exhaust valves are arranged for each cylinder.

Therefore, the number of intake and exhaust valves installed in each cylinder is
For example, if the number of intake and exhaust valves is increased from two to four, the configuration of the valve mechanism must be changed as the number of intake and exhaust valves increases, making it impossible to standardize parts and increasing costs. There is.

In addition, as the number of intake and exhaust valves increases, the shape of the cylinder head has to be changed, and the appearance of the cylinder head changes, making it necessary to change the design of the transfer and other equipment attached to the cylinder head. There are disadvantages in that it is difficult to standardize head processing equipment, and the manufacturing cost increases, which is economically disadvantageous.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, an object of the present invention is to provide a cylinder head for a valve train in which the formation position of the intake valve and the formation position of the exhaust valve are fixed in the width direction orthogonal to the longitudinal direction of the cylinder head. As a result, the external shape and processing equipment of the cylinder head can be made common regardless of the number of intake and exhaust valves, and the parts used can also be made common, thereby realizing a cylinder head for a multi-cylinder engine that can reduce costs.

[Means for solving problems]

In order to achieve this object, the present invention provides a cylinder head of a multi-cylinder engine having a valve operating mechanism that presses a valve stem end to open and close a valve in response to the operation of the cam. a shaft, one cam cap covering the camshaft, at least one first and second rocker arms each communicating with the camshaft, and an intake valve that opens and closes an intake passage by the first rocker arm; It consists of an exhaust valve that opens and closes an exhaust passage by a second rocker arm, a rocker shaft to which the first and second rocker arms are respectively pivoted, and a spark plug. The present invention is characterized by configuring a cylinder head for a valve train in which the formation position of the intake valve and the formation position of the exhaust valve are fixed.

[Effect]

With the above configuration, when forming the cylinder head of a multi-cylinder engine, the formation position of the intake valve and the formation position of the exhaust valve in the width direction perpendicular to the longitudinal direction of the cylinder head are fixed, and the valve operation is performed. system cylinder head, and standardize the external shape and processing equipment of the cylinder head regardless of the number of intake and exhaust valves.
The parts used are also standardized, reducing costs.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

1 to 7 show embodiments of this invention. 1st
In the figure, 2 is a multi-cylinder engine.

This multi-cylinder engine 2 is formed by a cylinder head 4 and a cylinder block (not shown), and forms a plurality of cylinders 6 that combust an air-fuel mixture.

The cylinder head) 4 is connected to the cam 8 as shown in the first M.
This camshaft 10 is covered with one cam cap 12.

Further, the upper end of the spink-type 10th stopper 14 is provided in contact with the cam 8 in the cylinder 64H, and this first
0 Sokar A J, one end of 14 Rosoka Shaf) -16
is supported by a spherical recess 162, and an intake valve 20 for opening and closing the intake passage 18 is provided at the other end. Further, one end of the second rocker arm 22 is provided to be in contact with the cam 8,
The other end of the second rocker arm 22 connects the exhaust passage 24
An exhaust valve 26 for opening and closing is provided, and a valve operating mechanism 28 is constructed.

First, as shown in 1, the formation position of the intake valve 20 and the formation position of the exhaust valve 2G in the width direction orthogonal to the longitudinal direction of the cylinder head 4 are fixed, and the number of intake and exhaust valves 20.26 is adjusted. The cylinder head 4 is formed to be common regardless.

Then, as shown in Figure 2.3, for example, the four first to
It has 4th cylinders 6A-1, 6A-2, 6A-3, 6A-4, and one intake and exhaust Hartz 2OA, 26A respectively.
In the two-valve engine 2, one cam shirt l-10A in which the cam 8A is attached to the first cylinder 6A-1 has one first and second rocker arms +-4, A, 22A, respectively.
The first rocker arm 14A operates the intake valve 20Δ to open and close the intake passage 18A, and the second rocker arm 22A operates the exhaust valve 26A to open and close the exhaust passage 24A. . and the first and second rocker arms 14A,
22A are respectively pivotally attached to the rocker shaft 16A, and the ignition valves (not shown) are formed so as to have a predetermined inclination angle with respect to the longitudinal center line T-C of the cylinder head 4, that is, as shown by the dashed line in FIG. Center line Lp of the hole for removing the plug
The spark plug 30A is provided so as to match the spark plug 30A.

In addition, as shown in Fig. 4.5, for example, four first to fourth
It has cylinders 6B-1, 6B-2, 6B-3, 6B-, l, and two intake valves 20F3-1.20B.
-2 and one exhaust valve 26B, one first and second rocker are attached to one camshaft 10, which has the cam 8B attached to the first cylinder 6B-1. arm]/IB, 22B, and the first
Intake valve 2OB-1 by 0 Socaiano, 14.8
, 20B-2 are respectively operated to open and close the intake passage 18B, and the second rocker arm 22B is operated to operate the exhaust valve 26B to open and close the exhaust passage 24. B is provided to open and close. The first and second rocker arms 1
4. B, 22B are respectively pivotally attached to the mouth/lug shaft 16B, and are formed so as to have a predetermined inclination angle with respect to the longitudinal center line Lc of the cylinder head 4, that is, as shown by the one-dot chain line in FIG. When installing a spark plug (not shown), the spark plug 30B is installed so as to match the center line Lllll11 of the hole.

Furthermore, as shown in Figure 6.7, for example, four first to fourth
It has cylinders 6C-1, 6C-2, 6C-3, and 6C-4, and two intake and exhaust valves 20 (, -1, 20
In the 4-valve type having C-2, 26C-1, and 26C-2, one first and second rocker arms are attached to one camshaft 10C in which the cam 8C is attached to the first cylinder 6C-1. 14C-122C, and the first rocker arm 14C connects the intake valves 20C-1, 20(
, -2 respectively to open and close the intake passage 18C, and the second rocker arm 22C opens and closes the exhaust valve 26.
It is provided to open and close the exhaust passage 24C by respectively operating C-1 and 26C-2.

And the said first and 20th Socar Ar-1, 14C222
ignition cylinders (not shown) are formed as shown by two-dot chain lines in FIG. The spark plug 30C is installed so as to match the center line Lp2 of the hole.

In the cylinder head 4 of the 2- to 4-valve type,
The intake and exhaust holes 32 and 34, which are opened and closed by the intake and exhaust valves 20 and 26, can be arranged by simply moving their drilling positions in the longitudinal direction of the cylinder head 4, as shown in Fig. 3.5.7. , the intake valve 20 has the same shape as in the 2.3-valve type.

In addition, in the 3.4 valve type, the exhaust valve 26 is
In addition to using the same shape, the first rocker arm 14 uses the same shape in the 2.3 valve type, and the second rocker arm 22 uses the same shape in the 2.4 valve type. use.

The camshaft 10 and the rocker shaft 16
The same shape is used for all 2- to 4-valve types.

In addition, the spark plugs 30 are all of the same shape in the 2-4 valve type, and in the 4-valve type, when installing the spark plug, the inclination of the center line Ll) 2 (described later) of the hole is 2.
．． For example, 1 which is the same as the slope of the center line I-pt of the 3-valve type.
At the same time, the center line Lp2 position (described later) of the 4-valve type is moved parallel to the center line Ll)1 position of the 2.3-valve type toward the rocker shaft 16 side, as shown in FIG. It is formed so as to open at the center part of 6.

Note that the symbol Lc represents the vertical center line of the cylinder head 4, and Lp
1 is the 2.3-valve type spark plug installation (not shown) shown by the dashed line in Figure 1, is the center line of the hole, and Lp2 is the 4-valve type spark plug installation (not shown) shown by the double-dotted chain line in Figure 1. is the center line of the borehole.

As a result, regardless of the number of the intake and exhaust valves 20.26, the drilling positions of the intake and exhaust holes 32.34 that are opened and closed by the intake and exhaust valves 20, 26 in the cylinder 4 of the 2- to 4-valve type can be adjusted. , it can be dealt with by simply moving the cylinder head 4 in the longitudinal direction, the outer shape of the cylinder head 4 and processing equipment can be shared, the processing equipment can be relatively inexpensive, and the layout of the valve mechanism 28 is facilitated. The configuration can be simplified and manufacturing costs can be reduced.

In addition, the camshaft 10 and the rocker shaft 16,
The spark plug 30 or other parts can all have the same shape in a 2- to 4-valve type,
Most of the parts used can be shared, reducing the number of parts and reducing costs.

Furthermore, since the external appearance of the 2- to 4-valve cylinder heads 4 can all be the same, there is no need to change the design of the transfer or other equipment connected to the cylinder head 4, which is advantageous in practice. The appearance of the cylinder head 4 can be unified, the uniqueness unique to the manufacturer can be expressed, and a unique aesthetic appearance can be created.

Furthermore, the cylinder head can be mass-produced, contributing to cost reduction.

Note that the present invention is not limited to the above-described embodiments, and various modifications can be made.

For example, in the embodiments of the present invention, a four-cylinder engine has been described as a multi-cylinder engine, but the present invention can also be applied to a three-cylinder engine, a six-cylinder engine, or other multi-cylinder engines.

〔Effect of the invention〕

As explained in detail above, according to the present invention, a cylinder head for a valve train is constructed in which the formation position of the intake valve and the formation position of the exhaust valve in the width direction perpendicular to the longitudinal direction of the cylinder head are fixed. Regardless of the number of intake and exhaust valves, the formation positions of the intake and exhaust valves and the formation positions of the exhaust valves can be fixed, the external shape of the cylinder head and processing equipment can be shared, and the processing equipment can be made relatively inexpensive. The layout of the valve mechanism is facilitated, the configuration is simplified, and manufacturing costs can be reduced. Moreover, since most of the parts used, such as the camshaft, rocker shaft, and other parts, can be shared, the number of parts can be reduced, and costs can be reduced. Furthermore, since all the cylinder heads can have the same external appearance, there is no need to change the design of the transfer or other equipment connected to the cylinder head, which is advantageous in practice, and the external appearance of the cylinder head 4 can be unified. It is possible to create a unique aesthetic that is unique to the creator.

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention, in which FIG. 1 is an enlarged sectional view of main parts of a cylinder head of a multi-cylinder engine, FIG. 2 is a plan view of a two-valve type cylinder head of a multi-cylinder engine, and FIG. Figure 3 is a bottom view of a 2-valve type cylinder head of a multi-cylinder engine, Figure 4 is a top view of a 3-valve type cylinder head of a multi-cylinder engine, and Figure 5 is a nozzle to the 3-valve type cylinder of a multi-cylinder engine. FIG. 6 is a plan view of a four-valve cylinder head of a multi-cylinder engine, and FIG. 7 is a bottom view of a four-valve cylinder head of a multi-cylinder engine. In the figure, 2 is a multi-cylinder engine, 4 is a cylinder head, 6-1 is the first cylinder, 6-2 is the second cylinder, 6-3 is the third cylinder, 6-4 is the fourth cylinder, and 8 is the cam. , 10 is a camshaft, 12 is a cam cap, 14 is a first rocker arm, 16 is a rocker shaft, 18 is an intake passage, 20 is an intake valve, 22 is a second rocker arm, 24 is an exhaust passage, 26 is an exhaust valve, 2B is the valve mechanism, 30 is the spark plug, 32 is the intake hole, 34 is the exhaust hole, L c is the vertical center line of the cylinder head, L and p+ are the 2.3 valve type spark plug installation. The center line of the hole, Lp2, is the center line of the hole for installing a 4-valve type spark plug.

Claims (1)

[Claims] 1. In the cylinder head of a multi-cylinder engine having a valve operating mechanism that presses the valve stem end to open and close the valves in accordance with the operation of the cam, one camshaft on which the cam is mounted and one that covers this camshaft. at least one cam cap and at least one each connected to the camshaft.
an intake valve that opens and closes an intake passage with the first rocker arm; an exhaust valve that opens and closes the exhaust passage with the second rocker arm;
A valve train consisting of a rocker shaft to which a second rocker arm is pivoted, and a spark plug, and in which the formation position of the intake valve and the formation position of the exhaust valve in the width direction perpendicular to the longitudinal direction of the cylinder head are fixed. A cylinder head for a multi-cylinder engine characterized by comprising a cylinder head for a system.