JPH0232845Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cylinder head mainly applied to a V-type engine for a vehicle.

(Prior Art) Conventionally, as seen in Japanese Utility Model Application Publication No. 60-61407, a cylinder head is located in the valve operating chamber at the upper part of the cylinder head body, midway between the intake valve arrangement part and the exhaust valve arrangement part. An ignition plug insertion tube is provided upright, an intake valve and an exhaust valve are provided as a pair, and one of the intake valve and the exhaust valve, for example, the exhaust valve, is inserted through a rocker arm by a camshaft provided above the intake valve placement part. A cylinder head is known in which the bearing of the support shaft of the rocker arm is provided in a portion of the valve operating chamber nearer to the insertion cylinder of the exhaust valve arrangement portion.

(Problem to be solved by the invention) In the above device, a pair of rocker arms that drive a pair of exhaust valves are provided on both sides of the bearing, so a large load is placed on both ends of the bearing. It is desirable to increase the support rigidity by having both ends of the bearing part supported by the cylinder head body, and also to increase the rigidity between the outer wall of the exhaust valve arrangement part of the valve operating chamber and the spark plug insertion tube. Therefore, it is desirable to connect the outer wall and the insertion tube via a rib.

In order to meet this demand, a pair of ribs are formed on the cylinder head body that connect the outer wall and the spark plug insertion tube with an interval that is approximately the same as the length of the bearing, and the cylinder head body is designed to span both ribs. However, when machining the seat surface of the valve spring at the bottom of the valve chamber, the tool inserted from above interferes with each rib, causing the spring seat to There is a problem that it becomes difficult to process the surface.

In view of the above points, an object of the present invention is to provide a cylinder head that can satisfy the above requirements without impairing the workability of the spring seat surface.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a valve train located in the upper part of the cylinder head body between the intake valve arrangement part and the exhaust valve arrangement part. A cylinder head for an engine in which a spark plug insertion cylinder is provided upright, a pair of at least one of an intake valve and an exhaust valve is provided, and the one valve is driven by a camshaft via a rocker arm. , in which the bearing portion of the support shaft of the rocker arm is provided in a portion of the valve chamber in which the one valve is disposed near the insertion cylinder, the cylinder head body is provided with a bearing portion of the one valve in the valve chamber; A rib is formed extending from the outer wall of the arrangement part to the insertion cylinder through the space between the arrangement parts of the one valve, and the part of the rib on the insertion cylinder side is branched into two.
It is characterized in that the bearing part is formed in the crotch part.

(Example) The present invention will be explained with reference to the illustrated example. In the drawings, reference numeral 1 indicates a six-cylinder V-type engine having a pair of front and rear banks 2, 2 each forming three cylinders in a horizontal row; 3 indicates a cylinder head body provided above each bank 2; Each cylinder head body 3 is provided with a pair of intake valves 4 and exhaust valves 5 for each cylinder, and one of the intake valves 4, 4 or the exhaust valves 5, 5, for example, both exhaust valves 5, 5, is provided as a pair. The other valve, for example, a common camshaft 6 provided on both the intake valves 4 and 4 side, is driven via a seesaw-shaped rocker arm 7, and a valve operating chamber in the upper part of each cylinder head body 3 is driven. , a partition wall 8 located between the intake valve 4 arrangement part and the exhaust valve arrangement part 5 and extending in the cylinder row direction; and a spark plug insertion cylinder 8b having a plug insertion hole 8a facing the center of the combustion chamber of each cylinder. Further, a transparent window 9 is formed to open the exhaust valve 5 arrangement part of the valve train chamber to the outside over the entire length in the cylinder row direction, and a transparent window 9 is formed in the valve train chamber where the exhaust valve 5 is arranged, and a transparent window 9 is formed to open the exhaust valve 5 arrangement part near the insertion cylinder 8b. A cylindrical bearing portion 11 through which the support shaft 10 of the rocker arm 7 is inserted is provided at the portion.

In the drawings, reference numeral 12 denotes a cover 13 that covers the transparent window 9, a swing-type rocker arm 14 that opens the intake valve 4;
1 is a swing type rocker arm connected via a push rod 15 to one end of the seesaw type rocker arm 7 that opens the exhaust valve 5; 16 is a camshaft cover that covers the camshaft 6; 17 is a camshaft cover that covers the intake and exhaust valves 4 and 5; The valve spring 18 that biases toward the closing side indicates the seat surface of the spring 17.

Here, each insertion cylinder 8 is inserted into the cylinder head body 3 from the outer wall 19 of the exhaust valve 5 arrangement part of the valve train chamber to the space between the pair of exhaust valves 5, 5 of each cylinder.
A rib 21 is formed extending in the direction b, and the part of the rib 21 on the side of the insertion tube 8b is bifurcated,
The bearing portion 11 is formed in the two crotches 21a, 21a, and in more detail, the rib 21 extends in the axial direction of the exhaust valve 5, as shown in FIGS. 3 to 5. Forms a roughly Y shape when viewed from above,
The outer end thereof is connected to the inner surface of the outer wall 19, and the inner bifurcated portions 21a, 21a are connected to the insertion tube 8b and the transparent window 9.
The two crotches 21a,
The bearing portion 11 is integrally formed on the lower side of 21a so as to straddle this.

In the drawings, reference numeral 22 indicates an auxiliary bearing section provided on the cylinder head main body 3 at an intermediate position between the bearing sections 11.

(Function) The outer wall 19 of the valve train chamber and the spark plug insertion cylinder 8b are connected via the rib 21, and both 19, 8b are connected.
The bearing part 11 is supported by the bifurcated parts 21a, 21a of the rib 21 in the vicinity of both ends thereof, so that the bearing part 11 is supported against the load acting through the rocker arms 7, 7 on the outside of both ends of the bearing part 11. The support rigidity of all parts is increased.

Furthermore, the portion of the rib 21 that passes between the valves 5 and 5 does not branch into two, making it possible to secure a wide open space on the seat surface 18 of the valve spring 17 above the valve 5 in the axial direction. Machining of surface 18 is facilitated.

Incidentally, if the ribs 21 are formed so as to reach the opening wall portion 20 of the transparent window 9 as in the embodiment, the opening wall portion 20
This is advantageous in that the rigidity of the wall portion 20 is increased, and noise generation due to vibration of the wall portion 20 can be suppressed.

(Effects of the invention) As described above, according to the invention, the outer wall of the valve chamber and the spark plug insertion tube installed upright in the center thereof are connected via the rib, and the rigidity of both can be increased. The bearing part can be supported at both ends by the two crotches of the rib, and its support rigidity is increased, and the workability of the valve spring seat surface is not impaired, making it possible to obtain a highly rigid cylinder head with good workability as a whole. have an effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a V-type engine equipped with an example of the cylinder head of the present invention, FIG. 2 is a partially cutaway side view thereof, FIG. 3 is a front view of the cylinder head, and FIG.
The figure is a side view taken along the line -- in FIG. 3, and FIG. 5 is a perspective view of the cylinder head. 3... Cylinder head body, 4, 4... Intake valve, 5, 5... Exhaust valve, 6... Camshaft, 7... Rocker arm, 8b... Spark plug insertion tube, 10...
...Rotsuka arm support shaft, 11...Bearing part, 19
...Outside wall, 21...Rib, 21a, 21a...
2 crotches.

Claims (1)

[Scope of utility model registration request] An ignition plug insertion tube is installed upright in the valve train chamber at the upper part of the cylinder head body, located between the intake valve arrangement part and the exhaust valve arrangement part, and at least one of the intake valve and the exhaust valve is installed in the valve train chamber. A cylinder head for an engine in which the one valve is driven by a camshaft via a rocker arm, the bearing part of the support shaft of the rocker arm being located in the valve operating chamber of the one valve. In the case where the cylinder head body is provided at a portion of the valve chamber near the insertion cylinder, the cylinder head body is provided with a valve that passes from the outer wall of the one valve arrangement part of the valve train chamber to the insertion cylinder through the space between the one valve arrangement. A cylinder head for an engine, characterized in that an extending rib is formed, a portion of the rib on the side of the insertion cylinder is bifurcated, and the bearing portion is formed in the bifurcated portion.