JPH0799082B2 - Valve drive for V-type four-cycle engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a V that enables the width of an engine to be reduced.
Type four-cycle engine valve operating system.

[Conventional technology and its problems]

In a four-cycle engine, if the number of cylinders is large, the length of the engine becomes longer if they are arranged in series, so the cylinders are arranged in a V-shape to shorten the engine length. V
In the case of a mold, the width is increased because the cylinders are arranged in a V shape on both sides. In particular, the intake / exhaust valves mounted on the cylinder head, which is placed on top of the cylinder, are usually arranged almost symmetrically with respect to the center line of the cylinder. To increase. There is a limit to narrowing the arrangement angle of the cylinders on both sides of the V type, and there is a disadvantage that the width becomes large. See, for example, Japanese Utility Model Laid-Open No. 60-61447 and Japanese Patent Laid-Open No. 58-51207.

[Object of the Invention]

The present invention is a V-type four-cycle engine which is attached to the cylinder head of a V-type four-cycle engine and which can change the inclination angle and length of intake and exhaust valves and the angle of intake and exhaust holes to reduce the engine width and improve the intake efficiency. The purpose is to obtain a valve operating system for an engine.

[Structure of Invention]

 Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings.

In the V-type engine, the cylinder 1 is arranged on both sides of the crankshaft 2 in a V-shape. A cylinder head 5 having an intake valve 3, an exhaust valve 4 and the like is connected to the upper surfaces of the cylinders 1 on both sides, and a head cover 6 is attached to the upper surface of the cylinder head 5. Therefore, the present invention is
Assuming that the inclination angle α _I of the intake valve 3 and the inclination angle α _E of the exhaust valve 4 with respect to the cylinder center line C are α _I <α _E , the inclination angle α _I on the intake valve 3 side is the inclination angle of the exhaust valve 4 Make it smaller than α _E. In addition, the length H _I of the intake valve 3 is set to the length of the exhaust valve 4.
Make it longer than H _E. The intake valve 3 is opened and closed by the rotation of the cam 8 of the cam shaft 7, and the exhaust valve 4 is opened and closed by the rotation of the cam 10 of the cam shaft 9. Further, the angle β _I of the intake hole 11 with respect to the cylinder center line C is made smaller than the angle β _E of the exhaust hole 12.

[Operation of the invention]

Since the length H _E of the exhaust valve 4 is shorter than the length H _I of the intake valve 3,
The protrusion of the cylinder head 5 to the outside can be reduced,
The engine width L can be made small and small. Further, the inclination angle α _I of the intake valve 3 is made smaller than the inclination angle α _E of the exhaust valve 4,
Since the angle β _I of 11 is made smaller than the angle β _E of the exhaust hole 12, the bending of the intake hole 11 can be made smaller, the intake air flows smoothly, the intake efficiency is improved, and the weekly power can be increased.

〔The invention's effect〕

As described above, in the present invention, in the V-type four-cycle engine in which the cylinders are arranged in the V-type, the inclination angle α _I of the intake valve with respect to the cylinder center line C is made smaller than the inclination angle α _E of the exhaust valve, The length H _I of the intake valve is made longer than the length H _E of the exhaust valve, and the intake hole angle β _{I with} respect to the cylinder center line C
Is smaller than the exhaust hole angle β _E , the engine width L
It is possible to reduce the size and size of the engine, reduce the bending of the intake hole, and improve the intake efficiency to increase the engine output.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an essential part showing an embodiment of the present invention. 3 ...... intake valve 4 ...... exhaust valve, 11 ...... intake hole, 12 ...... exhaust hole, C ...... cylinder centerline, alpha _I tilt angle _...... intake valve, alpha tilt angle _{E ......} exhaust valve , H _I …… Intake valve length, H _E
…… Exhaust valve length, β _I …… Intake hole angle, β _E …… Exhaust hole angle.

Claims (1)

[Claims] 1. In a V-type four-cycle engine having cylinders arranged in a V-shape, the intake valve inclination angle α _I with respect to the cylinder center line C is made smaller than the exhaust valve inclination angle α _E , and the intake valve length is set. A valve operating system for a V-type four-cycle engine, wherein H _I is longer than an exhaust valve length H _{E and} an intake hole angle β _I with respect to a cylinder center line C is smaller than an exhaust hole angle β _E.