JPH04129869U - Four-cycle engine intake system - Google Patents

Abstract

(57) [Summary] [Purpose] By making the intake pipe separate from the head cover, the degree of freedom in mounting the carburetor is increased, and by forming the intake pipe gasket integrally with the head cover gasket, it is easy to assemble. Obtaining an engine intake system. [Structure] An intake hole 5 extends from the intake valve 3 of the cylinder head 2 to the upper side of one side of the cylinder head 2, and the end surface 6 of the intake hole 5 is perpendicular to the intake hole 5.
The gasket 7 of the head cover 8 is provided at an angle with the top surface.
An intake pipe gasket 11 is integrally formed in the intake pipe 12, and the intake pipe gasket 11 is sandwiched between the intake pipe gasket 11 and fastened to the end face 6 of an intake hole 5, and a carburetor 14 is connected to the intake pipe 12.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to an intake system for a four-stroke engine.

0002

[Conventional technology]

In a four-stroke engine, the intake hole leading to the intake valve in the cylinder head is An intake that extends above one side of the cylinder head and is installed in the head cover at the intake hole. Some have pipes connected and a carburetor connected to the intake pipe. For example, see Utility Model Application Publication No. 56-157365 and Japanese Patent Application Publication No. 62-223449. Light.

0003

[Problem that the idea aims to solve]

The intake pipe installed in the head cover runs vertically upward from the cylinder head. It is more convenient to provide the mold in the head cover because it simplifies the process of cutting out the mold when casting the head cover. Good. However, the mounting position of the carburetor is higher and the aircraft body does not hit the carburetor. It is necessary to avoid this, and this aspect becomes complicated. head cover intake If the pipe is slanted to match the angle of the intake hole, molding the head cover will become complicated. , the manufacturing cost of the head cover is high.

0004 In view of this, this idea is to separate the intake pipe from the head cover. , the degree of freedom in installing the carburetor is increased, and the intake pipe gasket can be attached to the head cover. Four-cycle engine intake system that is integrated with the bar gasket for easy assembly The purpose is to obtain a position.

[0005]

[Means to solve the problem]

In order to achieve the above purpose, the intake system of the four-cycle engine of this invention is Extend the intake hole from the intake valve of the cylinder head to the upper side of the cylinder head. , the end surface of the intake hole is arranged perpendicular to the intake hole and inclined with the upper surface of the cylinder head, The intake pipe gasket is integrally formed with the head cover gasket. Place the intake pipe gasket under the intake pipe and tighten it to the end of the intake hole. , by connecting the carburetor to the intake pipe.

[0006]

[Effect]

The intake pipe is molded separately from the head cover, so be sure to align it with the intake hole. It can be attached to any length, increasing the flexibility of the vaporizer installation position. This allows you to avoid interference with the aircraft, etc. head cover gasket The kit is made of elastic material and has an intake pipe gasket on one side. By integrally molding, it can be prevented from falling off during assembly, and the number of parts can be reduced. At the same time, it is possible to prevent incorrect assembly of the gasket, such as the front and back sides.

[0007]

【Example】

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6. 1 to 4 show an embodiment of the present invention. cylinder block 1 An intake valve 3 is provided on one side of the cylinder head 2, which is fastened to the top surface of the cylinder head. An exhaust valve 4 is provided on the other side. The intake valve 3 is connected to the intake hole 5. The intake hole 5 extends upward from one side of the cylinder head 2. End of intake hole 5 The surface 6 is located below the upper surface of the cylinder head 2 and is perpendicular to the intake hole 5. It is provided to be inclined with respect to the upper surface of the head 2. On the top surface of cylinder head 2, The gasket 7 is sandwiched and sealed, and the head cover 8 is tightened. head cover 8 The gasket 7 is made of an elastic material and is formed into a strip with a convex cross section. The convex portion is fitted into a groove 10 provided in the wall 9 of the door cover 8. gasket 7 An intake pipe gasket 11 is integrally formed on the side of the intake pipe. intake pad The pipe gasket 11 is adapted to fit the end face 6 of the intake hole 5, and Fit into the groove 13 at the lower end of the pipe 12. Then, the bottom surface of the intake pipe 12 , and tighten it in line with the end surface 6 of the intake hole 5. At the tip of the intake pipe 12, there is a carburetor The container 14 is inserted and connected.

[0008] 5 and 6 show other embodiments of the present invention. In this case, the head The intake pipe gasket 11 formed integrally with the gasket 7 of the cover 8 also includes: It is formed in a convex shape in cross section, and the convex part fits into the groove 13 on the lower surface of the intake pipe 12. They are designed to fit together. The other parts are the same as those shown in FIGS. 1 to 4. Note that the intake pipe gasket 11 should be placed in the intake hole 5 with the convex portion facing downward. A groove may be provided in the end surface 6 to allow the fitting.

[0009] Since the intake pipe 12 is separate from the head cover 8, the end surface of the intake hole 5 It can be tilted to match 6. Also, the length of the intake pipe 12 is free. This increases the degree of freedom in installing the carburetor 14 and prevents interference with the aircraft. can. The intake pipe gasket 11 is the gasket of the head cover 8. Since it is formed integrally with the intake pipe 7, there is no need to drop it when assembling the intake pipe 12. This simplifies the assembly process and ensures reliable assembly. Wear.

0010

[Effect of the idea]

As explained above, this idea is configured as described above, so the intake pipe The head cover that fastens to the top of the cylinder head is separate, and the head cover is molded. It becomes easier to construct. In addition, the length of the intake pipe can be adjusted freely, making it easy to install the carburetor. This increases the degree of freedom in positioning and reduces the impact on the aircraft. And the intake gasket The gasket is integrally formed with the head cover gasket, reducing the number of parts and preventing incorrect assembly. This can prevent injuries.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal cross-sectional side view of the main parts of an embodiment of the present invention.

FIG. 3 is a bottom view of an intake pipe showing an embodiment of the present invention.

FIG. 4 is a partial plan view of a gasket of a head cover showing an embodiment of the present invention.

FIG. 5 is a longitudinal cross-sectional side view of the main parts showing another embodiment of the present invention.

FIG. 6 is a bottom view of an intake pipe showing another embodiment of the present invention.

[Explanation of symbols]

2 cylinder head 3 Intake valve 5 Intake hole 6 End face 7 Gasket 8 Head cover 11 Intake pipe gasket 12 Intake pipe 14 Vaporizer

Claims (1)

[Scope of utility model registration request] [Claim 1] An intake hole extends from the intake valve of the cylinder head to the upper side of one side of the cylinder head, and the end face of the intake hole is perpendicular to the intake hole and inclined to the upper surface of the cylinder head, and the intake is attached to the gasket of the head cover. An intake system for a four-cycle engine, characterized in that a pipe gasket is integrally formed, the intake pipe gasket is sandwiched between the lower side of the intake pipe and fastened to the end face of the intake hole, and a carburetor is connected to the intake pipe.