JP2514781Y2 - Engine oil passage structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an oil passage structure of an engine for sending lubricating oil from a cylinder block to a cylinder head.

(Prior Art) As shown in FIG. 5, an oil passage b of a cylinder block a and an oil passage d of a cylinder head c are connected by a communication passage e formed between the cylinder block a and the cylinder head c. An oil passage structure of an engine in which an oil amount adjusting orifice f is fitted in an outlet portion of an oil passage b of a cylinder block a is known from Japanese Utility Model Publication No. 61-132406.

(Problems to be Solved by the Invention) The orifice f regulates the amount of lubricating oil sent from the cylinder block a to the cylinder head c.
Due to the poor press-fitting of the orifice f and the difference in thermal expansion between the orifice f and the cylinder block a (generally, the former is Fe and the latter is Al), the hydraulic oil floats up during engine operation, causing the fifth As indicated by the imaginary line in the figure, there is a problem in that the top surface thereof is in close contact with the ceiling surface of the communication passage e to block the oil passage.

In order to deal with such a problem, as shown in FIG. 6, a groove g is provided on the end surface of the orifice f to secure an oil passage. However, in this case, since the groove g is formed on the upper and lower end surfaces in consideration of the workability of assembling the orifice f, there is a problem that the processing cost becomes high. Further, when the orifice f is pressed into the outlet of the oil passage b, a large force acts on the end face where the groove g is formed, and the orifice f may be deformed.

(Means for Solving the Problems) In order to solve the above problems, the present invention connects the oil passage of the cylinder block and the oil passage of the cylinder head by a communication passage formed between the cylinder block and the cylinder head. In the oil passage structure of the engine in which the oil amount adjusting orifice is fitted to the outlet portion of the oil passage of the cylinder block, the cylinder head gasket is provided with an orifice retaining portion for restricting the movement of the orifice toward the communication passage side. It is characterized by being provided integrally.

(Operation) According to the present invention, it is possible to prevent the oil amount adjusting orifice from moving to the communication passage side by the orifice retaining portion provided on the cylinder head gasket, so that the ordinary orifice without the groove is formed. Even with the use of, the flow of the lubricating oil from the cylinder block to the cylinder head can be secured.

(Embodiment) A first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The oil passage 2 of the aluminum die-cast cylinder block 1 is formed by drilling, and its outlet portion 3 is open on the upper surface of the cylinder block 1. A steel orifice 5 having a small hole 4 penetrating the center thereof is press-fitted into the outlet portion 3 of the oil passage 2.

The oil passage 7 of the aluminum die-cast cylinder head 6 is formed between the bolt insertion hole 8 and the fastening bolt 9. The fastening bolt 9 fixes the cylinder head 6 to the cylinder block 1 via a cylinder head gasket 10, and is screwed into a screw hole 11 provided in the cylinder block 1.

As shown in FIG. 2, the cylinder head gasket 10 is
Having a cutout portion 12, in a space surrounded by the cutout portion 12,
A space formed between the cylinder block 1 and the cylinder head 6 is a communication passage that connects the oil passages 2 and 7 to each other.
13 Therefore, the cutout portion 12 is formed to have a size including the oil passage outlet portion 3 of the cylinder block 1 and the oil passage inlet portion 24 of the cylinder head 6, and the cylinder head gasket 10 ensures the flow of lubricating oil. It has a sufficient thickness.

Silicon rubber ridges 14 are printed on the upper and lower surfaces of the cylinder head gasket 10 along the periphery of the cutout portion 12 to ensure sealing performance. A protruding piece (orifice retaining portion) 15a reaching above the orifice 5 is integrally formed at a portion near the punched portion 12 of the gasket body and close to the oil passage outlet portion 3. When the orifice 5 is lifted due to poor press-fitting or a difference in thermal expansion, the protruding piece 15a can prevent this and prevent the pores 4 of the orifice 5 from being blocked.

A second embodiment of the present invention shown in FIGS. 3 and 4 relates to a cylinder head gasket 10 formed by fitting a rubber ring 16 around the periphery of a cutout portion 12. In the second embodiment, in order to restrain the lifting of the orifice 5, the bridge (orifice retaining portion) 15b made of a metal pin or the like is inserted and fixed at both ends into the rubber ring 16, so that the cylinder head It is provided on the gasket 10. The bridge 15b is installed horizontally at a position as shown in FIG. 4 to prevent the lift-up of the orifice 5 and prevent the pores 4 of the orifice 5 from being blocked. Since other configurations are similar to those of the first embodiment, common reference numerals are given to FIGS. 3 and 4, and description thereof will be omitted.

The present invention can be configured in various modes other than the above embodiment. For example, the present invention can be applied to the one in which the oil passage 7 of the cylinder head 6 is formed similarly to the oil passage 2 of the cylinder block 1. Further, in the above embodiment, the communication passage 13 is constituted only by providing the cutout portion 12 of the cylinder head gasket 10, but in addition to this, a recess is formed in the joint surface of the cylinder head 6 or the cylinder block 1, It is also possible to apply the present invention to what constitutes the communication passage 13.

(Effect of the Invention) According to the present invention, a smooth flow of the lubricating oil supplied from the cylinder block to the cylinder head can be ensured by using a normal orifice without using an orifice having a groove formed on the end face. This is advantageous in terms of processing cost, and since the orifice retaining portion provided integrally with the cylinder head gasket enables the orifice to be retained, the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a sectional view of the first embodiment of the present invention, FIG. 2 is an arrow view taken along line II-II of FIG. 1, and FIG. 3 is a second embodiment of the present invention.
FIG. 4 is a plan view of a portion corresponding to the drawing, FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, FIG. 5 is a sectional view of a conventional example, and FIG. 6 is a perspective view of a conventional orifice. 1 …… Cylinder block 2 …… Oil passage 3 …… Outlet portion 5 …… Oil amount adjusting orifice 6 …… Cylinder head 7 …… Oil passage 10 …… Cylinder head gasket 13 …… Communication passage 15a, 15b …… Orifice Retaining part

Claims (1)

(57) [Scope of utility model registration request] 1. An oil passage for a cylinder block and an oil passage for a cylinder head are connected by a communication passage formed between the cylinder block and the cylinder head, and an oil amount adjusting orifice is provided at an output portion of the oil passage for the cylinder block. In the oil passage structure of the engine where is fitted,
An oil passage structure for an engine, characterized in that a cylinder head gasket is integrally provided with an orifice retaining portion for restraining the movement of the orifice toward the communication passage.