JPH09137705A - Cylinder head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the compact and light structure of cylinder head, and a composition part which can be easily manufactured and which can be easily assembled and which has good perspective. SOLUTION: In a cross section of an internal combustion engine, an intake valve 13 and an exhaust valve 14 form a valve angle at nearly 29-31 degree against a plane A-A in the longitudinal direction at a central part of an internal combustion engine, and a rotary shaft of locker arms 15, 16 formed as a locker arm with roller is positioned outside of both angle lines 22, 23 forming the valve angle. An ignition plug is extended in a V-shaped cylinder head area 21, which is formed by the intake valve 13 and the exhaust valve 14, along the plane A-A in the substantially longitudinal direction at a central part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head used in a reciprocating piston structure type internal combustion engine having a plurality of cylinders, and at least two intake valves and two intake valves per cylinder are provided above the cylinders. Two camshafts for operating two exhaust valves are provided, and both camshafts extend at an acute angle with respect to the central longitudinal plane of the internal combustion engine, and the one-arm type lever interposition is used. so,
An intake valve and an exhaust valve arranged in a suspended manner are operated, and valve heads of the intake valve and the exhaust valve are provided in a reciprocating piston and a cylinder head provided in a cylinder crank casing. And a cutout formed in the combustion chamber to control the gas flow.

[0002]

BACKGROUND OF THE INVENTION Modern internal combustion engines that serve to drive motor vehicles are subject to a wide variety of requirements. For example, not only is it relatively light in weight, but it is also desirable that it has good functions, requires little structural space, and is easy to manufacture.

Published German patent application 41215
The cylinder head known from the specification of No. 04 has a cover for housing the intake-side camshaft and the exhaust-side camshaft. Such a cover extending over the entire length of the internal combustion engine adds weight and makes the rocker arm difficult to operate. It is unavoidable that the clearance adjusting members for the rocker arms are difficult to assemble and the access to these clearance adjusting members becomes difficult. Furthermore, the rocker arm rotary shaft is housed inside and outside the V-shaped cylinder head region formed by the valve, which impairs the preferred placement of the spark plug.
In other words, the structural principle that promotes the free and meaningful shaping of the cylinder head cannot be seen from such a configuration.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to improve the cylinder head for a reciprocating cylinder type internal combustion engine of the four-cycle construction type, as mentioned at the outset, and to simply manufacture its components. However, it is an object of the present invention to provide a cylinder head that can be easily assembled, has a clear line of sight, is compact, and has an optimal structure in terms of weight.

[0005]

In order to solve this problem, in the constitution of the present invention, (a) when seen in a cross section of the internal combustion engine,
The intake valve and the exhaust valve form a valve angle of approximately 29 ° to 31 °, starting from the central longitudinal plane of the internal combustion engine,
(B) The rotation axis of the rocker arm formed as a rocker arm with rollers is located outside both angle lines that form the valve angle in the cylinder head region, and (c) is formed by the intake valve and the exhaust valve. The spark plug extends in the V-shaped cylinder head region substantially along the central longitudinal plane.

Further, another structure of the present invention is described in claims 2 and the following.

[0007]

The main advantage of the present invention is that the cylinder head according to the present invention is teleological in terms of components such as camshafts, rocker arms, valves and spark plugs.
logisch). Moreover, the inventive arrangements allow for a compact, rigid yet weight-saving construction. The selected valve angle not only ensures that, for a given internal combustion engine size (for example 1000 cc), a drive wheel driven by only one winding transmission can be arranged on both camshafts. It also ensures that sufficient squish surfaces can be created in the combustion chamber to support the combustion process. Furthermore, the bearing bridge is a component that can be manufactured advantageously and that holds the positions of both camshafts positively.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention shown in the drawings will be described.

A multi-cylinder of a four-cycle structure type (about 10
A 00cc four-cylinder) type internal combustion engine 1 has a cylinder crank casing 2 shown only schematically. This cylinder crank casing comprises a cylinder 3 for a reciprocating piston 5 and a crankshaft (not shown). The cylinder crank casing 2 supports a cylinder head 6. The exposed side 7 of this cylinder head is covered by a valve hood 8.

An intake device 9 is connected to the cylinder head 6. A fuel injection nozzle 10 is attached to this intake device.

Above the cylinder 3, a cylinder head 6 is provided.
An intake-side camshaft 11 and an exhaust-side camshaft 12 are arranged in the inside with a space in parallel with each other.
The spacing of these camshafts with respect to the central longitudinal plane AA of the internal combustion engine 1 is approximately equal. The intake-side camshaft 11 and the exhaust-side camshaft 12 have intake valves 13, 13 ′ or exhaust valves 14, 14 ′ suspended in the cylinder head 6 and arranged in a one-arm type rocker arm 1.
Operate with 5,16 intervention. Both camshafts 11, 12
Each cam 17 of FIG. That is, these rocker arms 15 and 16 are so-called roller rocker arms (Rollen-Schlepphebel).

Two intake valves 13 and 13 'and two exhaust valves 14 and 14' are provided for each cylinder 3. These intake and exhaust valves are oriented at an acute angle to a predetermined longitudinal plane B-B and
It forms a valve angle α of 0 °. This valve angle may be between 29 ° and 31 °. Longitudinal plane BB and intake valves 13, 1
The angle β with 3'is 14 ° or 13 ° 30'-15
゜. The angle δ between the longitudinal plane B-B and the exhaust valve 14, 14 'is 16 ° or 15 ° 30'-16 ° 3
It is 0 '.

Rotating shafts 19 and 2 of the rocker arms 15 and 16
0 is located outside the V-shaped cylinder head region 21 defined by the angle lines 22, 23 forming the valve angle α. At such a position, the camshafts 11, 1
The centers 24 and 25 of 2 are also taken. Further, an ignition plug 26 is housed inside the cylinder head region 21. These spark plugs extend along a central longitudinal plane AA.

Intake valves 13, 13 'and exhaust valves 14, 1
4'has valve heads 27, 27 '; 28, 28'. These valve heads control the gas flow in the combustion chamber 29 formed by the top dead center position of the reciprocating piston 5 and the gable roof notch 30 provided in the cylinder head 6. For this reason, the cylinder head 6 is formed with an intake passage 31 and an exhaust passage 32.

The cylinder head 6 includes valve heads 27, 2
Between the 7'and the cylinder wall 33 for the reciprocating piston 5 and between the valve heads 28,28 'and the cylinder wall 33, squish surfaces 34,35 are provided. These squish surfaces are formed in a circle. Furthermore, another squish surface extending between the cylinder wall 33 and the valve heads 27, 28 and between the cylinder wall 33 and the valve heads 27 ', 28' is effective when viewed in the longitudinal direction CC of the internal combustion engine. It may be. Squish surface 34
Is larger than the squish surface 35. This means that both angular positions are formed with different sizes such that the angle β <angle δ, the diameter of the valve head is formed with different sizes such that valve head 27> valve head 28, and Directional plane B
-B, i.e. by shifting the central longitudinal plane of the cylinder 3 slightly with respect to the central longitudinal plane A-A towards the intake side. The mutual spacing between the central longitudinal plane AA and the longitudinal plane BB is indicated by the reference LD. These squish surfaces 34, 35 and the spark plug 26 arranged in the middle of the combustion chamber 29 result in a mixture with optimized ignition properties, and good flame propagation is achieved when this mixture burns. .

Intake valves 13, 13 'and exhaust valves 14, 1
4'free end, or more precisely the valve stem 36
In addition, a spring disc 37 is provided. A conical compression spring 38 is supported on these spring discs. The smaller diameter Dk of these compression springs corresponds to the respective spring disc 37.
Has been applied to. The larger diameter Dg is supported by the shoulder 39 of the cylinder head 6.

The intake-side camshaft 11 and the exhaust-side camshaft 12 have one end surface 4 of the cylinder head 6.
No. 0, it is pulled out from this cylinder head and is provided with drive wheels 41 and 42. These drive wheels are driven by only one winding transmission 43, by means of a crankshaft also provided with drive wheels.
In this embodiment, the winding transmission 43 is a toothed belt transmission. Furthermore, the camshaft 11 on the intake side is provided with an adjusting device 44. This adjusting device 44
Is the relative rotational position change of the intake side camshaft 11 with respect to the exhaust side camshaft 12 (adjustment range ENs).
Work for. The valve control timing is influenced by the corresponding adjustment process. The adjusting device 44 is housed in the boss 45 of the drive vehicle 41. Adjustment area ENs of this adjustment device
Are shown, for example, in FIG.

The spark plug 26 is surrounded by a tubular guide sleeve 46. These guide sleeves are located in the housing 47 of the cylinder head 6 and the housing 48 of the valve hood 8.

The intake-side camshaft 11 and the exhaust-side camshaft 12 are accommodated on the one hand by bearing blocks 49 and 50 provided on the cylinder head 6, and on the other hand in the longitudinal direction CC of the internal combustion engine. The position is held by only three bearing bridges 51, 52, 53 extending at intervals in the orthogonal direction. The bearing bridges 51 and 52 surround the guide sleeve 46 by the annular portion 54, and
Are connected to the cylinder head 6 by screws 55, 56, 57, 58 extending on both sides of the.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a region of a cylinder head of an internal combustion engine.

FIG. 2 is a diagram showing a direction of an arrow X in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a diagram showing the direction of arrow Y in FIG. 3;

[Explanation of symbols]

1 internal combustion engine, 2 cylinder crank casing,
3 cylinders, 5 reciprocating pistons, 6 cylinder heads, 7 free sides, 8 valve hoods, 9 intake devices, 10 fuel injection nozzles, 11 and 12 camshafts, 13 and 13 'intake valves, 14 and 14' exhaust valves, 15,16 Rocker arm, 17 cam, 18
Roller, 19, 20 Rotating shaft, 21 Cylinder head area, 22, 23 Angle line, 24, 25
Center, 26 spark plugs, 27, 27 ', 28, 2
8'valve head, 29 combustion chamber, 30 notches, 3
1 intake passage, 32 exhaust passage, 33 cylinder wall, 34, 34 ', 35, 35' squish surface,
36 valve stems, 37 spring discs, 38 compression springs,
39 shoulder, 40 end face, 41,42 drive wheel, 43 winding transmission device, 44 adjusting device,
45 boss, 46 guide sleeve, 47, 48 accommodating portion, 49, 50 bearing block, 51, 52,
53 bearing bridge, 54 annular part, 55, 5
6,57,58 screws, A-A central longitudinal plane,
BB longitudinal plane, α valve angle, β, δ angle, Dk, Dg diameter, CC longitudinal direction, LD
Mutual spacing

Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location F02F 1/24 F02F 1/24 F D H (71) Applicant 591149883 Regina São Chénal de Eugene Renault Societe Anonym France Boulogne- Billankool Sedex, Kedeleningler, 860 (72) Inventor Winfried Crepes Germany Ludwigsburg Babenhauser Strasse 6

Claims (10)

[Claims] 1. A cylinder head for use in a reciprocating piston structure type internal combustion engine having a plurality of cylinders, wherein at least two intake valves and two exhaust valves per cylinder are provided above the cylinders. Two camshafts for operation are provided, both camshafts extending at an acute angle with respect to the central longitudinal plane of the internal combustion engine and suspended under the intervention of a one-armed lever. The intake valve and the exhaust valve are arranged to operate, and the valve heads of the intake valve and the exhaust valve include a reciprocating piston provided in the cylinder crank casing and a notch provided in the cylinder head. Of the type adapted to control the gas flow in the combustion chamber formed by (a) the intake valve (13, 1) as viewed in cross section of the internal combustion engine.
3 ') and the exhaust valve (14, 14'), starting from the central longitudinal plane (A-A) of the internal combustion engine, approximately 29 DEG to 3 DEG.
(2) The rotation axis of the rocker arm (15, 16) formed as a rocker arm with a roller forms a valve angle (α) of the cylinder head region (21). Both angle lines (2
(C) Intake valve (13, 13 ') and exhaust valve (14, 1)
Cylinder head, characterized in that a spark plug (26) extends substantially along the central longitudinal plane (AA) in the V-shaped cylinder head region (21) formed by 4 '). . 2. In a cross-section of the internal combustion engine, the intake valve (13, 13 ') is located between 13 ° 30' and 15 ° with respect to the central longitudinal plane (AA) of the internal combustion engine (1). Angle (β)
The exhaust valves (14, 14 ') are
The cylinder head according to claim 1, wherein the cylinder head is arranged at an angle (δ) of 5 ° 30 'to 16 ° 30'. 3. The cylinder head (6) between at least the valve head (27, 27 ') and the cylinder wall (33) for the reciprocating piston (5) and the valve head (28, 2).
8 ') and the cylinder wall (33) between the intake valve (1
Cylinder head according to claims 1 and 2, characterized in that squish surfaces (34, 35) in the form of circular sections are provided on both the (3, 13 ') side and the exhaust valve (14, 14') side. 4. The valve is held in a closed position by a compression spring, the compression spring (38) having a conical shape,
Each smaller diameter (Dk) of the compression spring (38) is supported on the spring disc (37) of the valve stem (36),
The cylinder head according to any one of claims 1 to 3. 5. The end faces (40) of both camshafts (11, 12) have drive wheels (41, 42), which drive wheels are connected to a crankshaft by a drive wheel.
Cylinder head according to claim 1, adapted to be driven via a winding transmission (43). 6. The camshaft (11) on the intake side comprises an adjusting device (44), which adjusts the camshaft (1) on the intake side with respect to the camshaft (12) on the exhaust side.
The cylinder head according to claim 5, which functions to relatively change the rotational position of 1). 7. Cylinder head according to claim 6, characterized in that the adjusting device (44) is associated with the drive wheel (41) of the intake-side camshaft (11). 8. Each spark plug (26) is surrounded by a tubular guide sleeve (46), which guide sleeve covers a cylinder head (6) and a valve hood (6) covering the cylinder head (6). 8. The cylinder head according to claim 7, which is provided in a housing portion (47, 48) provided in (8). 9. A camshaft (11) on the intake side and a camshaft (12) on the exhaust side are held in position by a plurality of bearing bridges (51, 52, 53) spaced apart from one another. The cylinder head according to item 1. 10. Bearing bridge (51, 52, 53)
Are provided on both sides of the intake side camshaft (11) and on both sides of the exhaust side camshaft (12).
Cylinder head according to claim 9, fixed to the cylinder head (6) by means of 56, 57, 58).