JPH10131723A - Cylinder head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of deformation, to lower the generation of vibration and noise, and to lower the weight and cost, and to reduce the number of fitting bolt. SOLUTION: In this cylinder head, a cam shaft 14 is supported by a cam shaft cap 16 freely to be turned at one side in the cross direction of the cylinder head, and a rocker shaft 26, which is divided to plural shafts at the other side in the cross direction of the cylinder head, is supported by a rocker shaft cap on the same shaft freely to be turned, and a rocker arm for driving any one of an intake valve and an exhaust valve with the oscillation of the cam shaft 14 is supported by the rocker shaft freely to be oscillated. In this case, the cam shaft cap 16 and a rocker shaft cap 28 opposite to each other at each side in the cross direction of the cylinder head are integrally connected to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head, and more particularly to a cylinder head which can prevent deformation, reduce vibration and noise, can achieve weight reduction and cost reduction, and reduce the number of mounting bolts. For obtaining a cylinder head.

[0002]

2. Description of the Related Art An engine mounted on a vehicle or the like is provided with a valve operating mechanism for driving an intake valve and an exhaust valve for each cylinder in a cylinder head. The valve operating mechanism is provided with a camshaft driven by an engine supported by a cylinder head. The camshaft drives an intake valve and an exhaust valve via a rocker arm. Some of them drive valves and exhaust valves.

FIG. 3 shows such a cylinder head.
6 to FIG. In FIG. 3, reference numeral 102 denotes an engine, 104 denotes a cylinder head, and 106 denotes a head cover. In the engine 102, a cylinder head 104 is attached to a cylinder block (not shown), and a head cover 106 is attached to the cylinder head 104.

As shown in FIG. 6, the cylinder head 104 is provided with an intake valve 108 and an exhaust valve 110 for each cylinder (not shown).
Is provided with a valve operating mechanism 112 for driving the motor.

[0005] As shown in FIGS. 4 and 5, the valve mechanism 112 has one cam shaft 114 supported by a cam shaft cap 116 on one side in the width direction of the cylinder head 104. The camshaft cap 116 is attached to the cylinder head 104 by a camshaft cap attaching bolt 118, and supports the camshaft 114.

The valve mechanism 112 supports a plurality of divided rocker shafts 120 on the other side in the width direction of the cylinder head 104 with a rocker shaft cap 122 coaxially and in parallel with the cam shaft 114. Provided. The rocker shaft cap 122 is provided with an ignition plug insertion hole 124, which is mounted on the cylinder head 104 with a rocker shaft cap mounting bolt 126 to support the rocker shaft 120.

[0007] As shown in FIG.
Seesaw rocker arm 128 on cylinder head 104
Is provided. The rocker arm 128 of the seesaw type swingably supports an intermediate portion on the rocker shaft 120 so as to drive one of the intake valve 108 and the exhaust valve 110, for example, the intake valve 108, and has one end side of the intake shaft of the cam shaft 114. The other end is brought into contact with the intake valve 108 while sliding on a cam (not shown).

The valve mechanism 112 has a swing type rocker arm 130 provided on the cylinder head 104. The swing type rocker arm 130 is connected to the intake valve 10.
8 and the exhaust valve 110, for example, the exhaust valve 11
One end is rotatably supported by the cylinder head 104 so as to drive the cylinder head 104, and one side of the other end is slidably contacted with an exhaust cam (not shown) of the cam shaft 114 and the other side of the other end is provided. Are in contact with the exhaust valve 110.

The valve mechanism 112 drives the intake valve 108 by swinging a seesaw type rocker arm 128 by rotation of a cam shaft 114, and also rotates a swing type rocker arm 130 by rotation of the cam shaft 114. The exhaust valve 110 is driven.

As described above, the cylinder head 104 is provided with the intake valve 108 and the exhaust valve 110 for each cylinder.
One cam shaft 114 is provided on one side in the width direction and the cam shaft cap 11
6 and a plurality of rocker shafts 120 divided on the other side in the width direction are coaxially supported by a rocker shaft cap 122 in parallel with the cam shaft 114, and provided on the other side.
A rocker arm 128 of a seesaw type that is oscillated by 14 to drive either the intake valve 108 or the exhaust valve 110
Are rockably supported on the rocker shaft 120.

An example of such a cylinder head is disclosed in Japanese Utility Model Laid-Open Publication No. 1-110815. In this publication, a plug hole that opens into a combustion chamber is formed in a cylinder head, and two cam shafts are arranged in parallel on both sides of the plug hole. , A camshaft cap integrally formed so as to support the two camshafts is provided, and a through hole communicating with the plug hole is formed in the camshaft cap.

[0012]

However, FIG. 3 to FIG.
Rocker shaft 12 supported by cylinder head 104 shown in FIG.
0 is divided into a plurality of pieces to avoid the spark plug 132. For this reason, there is a problem that the divided rocker shafts 120 have lower rigidity than the rocker shafts formed integrally.

For this reason, when the valve mechanism 112 is driven, the cylinder head 104, as shown in FIG.
In addition, there are inconveniences that the portions of the camshaft cap 116 and the portions of the rocker shaft cap 122 are deformed in the directions shown by arrows B1 and B2 due to the loads A1 and A2 from the exhaust valve 110, thereby causing noise and vibration.

In order to prevent deformation, the rigidity of the divided rocker shaft 120 and the rocker shaft cap 122 must be higher than that of the integrally formed rocker shaft.
It is necessary to increase the rigidity of the cylinder head 104 itself, which causes an increase in weight and an increase in cost.

[0015]

SUMMARY OF THE INVENTION Accordingly, in order to eliminate the above-mentioned disadvantages, the present invention provides an intake valve and an exhaust valve for each cylinder in an engine cylinder head, and one valve on one side in the width direction of the cylinder head. The camshaft is supported by a camshaft cap and provided on the other side in the width direction of the cylinder head. A plurality of divided rocker shafts are provided coaxially and supported by the rocker shaft cap in parallel with the camshaft. A rocker arm swingably driven by the camshaft to drive one of the intake valve and the exhaust valve is pivotally supported on the rocker shaft, and is provided on each side in the width direction of the cylinder head. Wherein the camshaft cap and the rocker shaft cap facing each other are integrally connected and provided.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a cylinder head according to the present invention, one cam shaft is supported on one side in the width direction by a cam shaft cap, and a plurality of divided rocker shafts are coaxially mounted on the other side in the width direction. A rocker arm is provided above and in parallel with the camshaft and supported by a rocker shaft cap, and a rocker arm that is swung by the camshaft and drives one of the intake valve and the exhaust valve is swingably supported by the rocker shaft. The camshaft cap and the rocker shaft cap facing each other on each side in the width direction of the cylinder head are integrally connected to each other, so that the rigidity of the camshaft cap and the rocker shaft cap can be increased, It is not necessary to increase the rigidity of the rocker shaft, the rocker shaft cap, and the cylinder head itself, and the mounting bolt can be shared.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. 1 and 2, reference numeral 2 denotes an engine, 4 denotes a cylinder head, and 6 denotes a head cover. The engine 2 has a cylinder head 4 mounted on a cylinder block (not shown).
A head cover 6 is attached to the cylinder head 4.

The cylinder head 4 has an intake valve 8 and an exhaust valve 10 for each cylinder (not shown), and a valve mechanism 12 for driving the intake valve 8 and the exhaust valve 10.

The valve operating mechanism 12 has one cam shaft 14 for driving the intake valve 8 and the exhaust valve 10 supported by a cam shaft cap 16 on one side in the width direction of the cylinder head 4. The camshaft cap 16 is attached to the head-side shaft support portion 20 of the cylinder head 4 by a camshaft cap mounting bolt 18, and the cap-side bearing surface 22 and the head-side bearing surface 2 are provided.
The cam shaft 14 is supported by 4.

The valve mechanism 12 supports a plurality of divided rocker shafts 26 on the other side in the width direction of the cylinder head 4 with a rocker shaft cap 28 coaxially and in parallel with the cam shaft 14. It is provided. The rocker shaft cap 28 is provided with a spark plug insertion hole 30. The rocker shaft cap 28 is attached to the head side support portion 34 of the cylinder head 4 by the rocker shaft cap mounting bolt 32.
The rocker shaft 26 is supported by the cap-side support surface 36 and the head-side support surface 38.

The valve mechanism 12 has a seesaw rocker arm 40 provided on the cylinder head 4. The rocker arm 40 of the seesaw type is configured to drive the rocker shaft 26 so as to drive one of the intake valve 8 and the exhaust valve 10, for example, the intake valve 8.
An intermediate portion is pivotally supported at one end, and one end is slidably contacted with an intake cam (not shown) of the camshaft 14 and the other end is contacted with the intake valve 8.

The valve mechanism 12 has a swing type rocker arm 42 provided on the cylinder head 4. The swing type rocker arm 42 includes the intake valve 8 and the exhaust valve 1.
0 to drive the exhaust valve 10, for example,
One end is pivotally supported by the cylinder head 4, and one side of the other end is slidably contacted with an exhaust cam (not shown) of the cam shaft 14, and the other side of the other end is in contact with the exhaust valve 10. In contact.

The valve mechanism 12 swings the rocker arm 40 of the seesaw type by the rotation of the camshaft 14 so that the intake valve 8
, And the exhaust valve 10 is driven by rotating the swing type rocker arm 42 by the rotation of the camshaft 14.

Thus, the cylinder head 4 has:
An intake valve 8 and an exhaust valve 10 are provided for each cylinder, one cam shaft 14 is supported on one side in the width direction by a cam shaft cap 16, and a plurality of rocker shafts 26 are coaxial on the other side in the width direction. A rocker shaft 40 of a seesaw type, which is provided above and supported by a rocker shaft cap 28 in parallel with the cam shaft 14 and is driven by the cam shaft 14 to drive either the intake valve 8 or the exhaust valve 10. Is provided so as to be pivotable.

The cylinder head 4 has a camshaft cap 16 and a rocker shaft cap 2 facing each other on each side in the width direction.
8 are integrally connected.

That is, as shown in FIG. 1, the cam shaft cap 16 and the rocker shaft cap 28
Are disposed at predetermined intervals in the longitudinal direction. These cam shaft cap 16 and rocker shaft cap 2
Reference numeral 8 denotes a portion in which the opposing portions of the caps 16 and 28 which are disposed on substantially the same straight line in the width direction of the cylinder head 4 are integrally connected by a connecting portion 44. Thus, the camshaft cap 16 and the rocker shaft cap 28 are integrally formed and provided in the deforming direction shown in FIG.

Next, the operation will be described.

The engine 2 intakes and exhausts a combustion chamber (not shown) by an intake valve 8 and an exhaust valve 10, and drives a crankshaft (not shown) by the combustion pressure. The valve operating mechanism 12 rotates the camshaft 14 in synchronization with the rotation of the crankshaft. The rotation of the camshaft 14 causes the rocker arm 40 of a seesaw type to swing, thereby driving the intake valve 8 and the camshaft 14. The exhaust valve 10 is driven by rotating the swing type rocker arm 42 by the rotation.

The cylinder head 4 of the engine 2 is provided with one camshaft 14 supported on one side in the width direction by a camshaft cap 16, and a plurality of divided rocker shafts 26 on the other side in the width direction. A rocker arm 40 is provided coaxially and in parallel with the camshaft 14 and supported by a rocker shaft cap 28, and a rocker arm 40 which is swung by the camshaft 14 and drives one of the intake valve 8 and the exhaust valve 10 is swung by the rocker shaft 26. It is movably supported by a shaft.

The cylinder head 4 includes a camshaft cap 16 and a rocker shaft cap 2 which face each other in the width direction.
8 are integrally connected to each other by a connecting portion 44 in a direction for deforming (see FIG. 7).

As a result, the rigidity of the camshaft cap 16 and the rocker shaft cap 28 of the cylinder head 4 can be increased, and as shown in FIG. 7, the cylinder head 4 is controlled by the loads A1 and A2 from the intake valve 8 and the exhaust valve 10. The camshaft cap 16 and the rocker shaft cap 28 can be prevented from being deformed in the directions indicated by arrows B1 and B2, and it is not necessary to increase the rigidity of the rocker shaft 26, the rocker shaft cap 28, and the cylinder head 4 itself.

Further, since the camshaft cap 16 and the rocker shaft cap 22 are integrally connected to each other, one of the camshaft cap mounting bolt 18 and the rocker shaft cap mounting bolt 32 in the connecting portion 44 is connected. It can be omitted and shared. In this embodiment, the camshaft cap mounting bolt 18 on the connecting portion 44 side is omitted, and the rocker shaft cap mounting bolt 32 is shared.

Therefore, the cylinder head 4 is mounted on the camshaft cap 1 by the load from the intake valve 8 and the exhaust valve 10.
6 and the rocker shaft cap 28 can be prevented from being deformed, vibration and noise can be reduced by preventing deformation, and there is no need to increase the rigidity of the rocker shaft 26, the rocker shaft cap 28, and the cylinder head 4 itself. Accordingly, the weight and cost can be reduced, and the number of mounting bolts can be reduced because the mounting bolts can be shared, whereby the cost can be reduced.

[0034]

As described above, according to the cylinder head of the present invention, the cam shaft cap and the rocker shaft cap which face each other in the width direction are integrally connected and provided.
The rigidity of the camshaft cap and the rocker shaft cap can be increased, and it is not necessary to increase the rigidity of the rocker shaft, the rocker shaft cap, and the cylinder head itself, and the mounting bolt can be shared.

Therefore, this cylinder head can prevent the deformation of the camshaft cap and the rocker shaft cap due to the load from the intake valve and the exhaust valve, and can reduce the vibration and noise by preventing the deformation. Since it is not necessary to increase the rigidity of the shaft, rocker shaft cap, and cylinder head itself, weight and cost can be reduced, and the number of mounting bolts can be reduced by using common mounting bolts. Costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a cylinder head showing an embodiment of the present invention.

FIG. 2 is a schematic side view of a cylinder head.

FIG. 3 is an assembled perspective view of a cylinder head portion of an engine showing a conventional example.

FIG. 4 is a schematic plan view of a cylinder head in which a cam shaft cap and a rocker shaft cap are sectioned.

FIG. 5 is a schematic plan view of a cylinder head.

FIG. 6 is a schematic side view of a cylinder head.

FIG. 7 is a diagram illustrating a deformation of a cylinder head.

[Explanation of symbols]

 2 Engine 4 Cylinder head 6 Head cover 8 Intake valve 10 Exhaust valve 12 Valve train 14 Cam shaft 16 Cam shaft cap 18 Cam shaft cap mounting bolt 26 Rocker shaft 28 Rocker shaft cap 30 Ignition plug insertion hole 32 Rocker shaft cap mounting bolt 40 Seeso Rocker arm of swing type 42 Rocker arm of swing type 44 Connecting part

Claims (1)

[Claims] An intake valve and an exhaust valve for each cylinder are provided in a cylinder head of an engine, and one cam shaft is provided on one side in the width direction of the cylinder head by a cam shaft cap. A rocker shaft divided into a plurality of rocker shafts on the other side in the width direction is provided coaxially and supported by a rocker shaft cap in parallel with the cam shaft, and is rocked by the cam shaft to allow any one of the intake valve and the exhaust valve. In a cylinder head provided with a rocker arm for driving one of the rockers pivotally supported on the rocker shaft, the cam shaft cap and the rocker shaft cap facing each other in the width direction of the cylinder head are integrally formed. A cylinder head provided in connection with the cylinder head.