JP2717299B2 - Cylinder head cooling system for 4-cycle engine - Google Patents

Abstract

PURPOSE:To simply perform positioning and supporting of a pipe in the circumferential direction and the axis direction by forming a notch of U-shaped cross section on the peripheral surface of the pipe on which lubricating oil injection holes are formed, and engaging the notch with a bolt arranged in a cylinder head. CONSTITUTION:A lubricating oil injection pipe 20 is arranged inside of a cylinder head 1. On the peripheral surface of the pipe 20, plural injection hole 20a are formed, and these holes are respectively provided adjacent to a recessed part (not shown) formed above the combustion chamber of the cylinder head 1. In this case, the notch 20b of U-shaped cross section is formed on the peripheral surface of the pipe 20 at the position in which a bolt 21 for attaching a cylinder cover to the cylinder head 1 is inserted and fitted. Movement of the pipe 20 in the circumferential direction is thus restricted by abutting the bottom part 20c of the notch 20b against the bolt 21, and movement of the pipe 20 in the axis direction is restricted by abutting the side parts 20d, 20e against the bolt 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention injects lubricating oil into a concave portion formed in a cylinder head, and cools the cylinder head with the injected lubricating oil. The present invention relates to an improvement in a cylinder head cooling device for a four-cycle engine.

[Conventional technology]

In general, in a four-cycle engine, there is a so-called oil-cooled cylinder head cooling device in which lubricating oil is injected into a recess formed in a cylinder head and the cylinder head is cooled by the injected lubricating oil.

FIG. 3 is a fragmentary cross-sectional view of a cylinder head 1 of a four-cycle engine to which the above-described conventional cylinder head cooling device is applied.

The cylinder head cooling device includes a concave portion 3 formed above the combustion chamber 2 of the cylinder head 1 and a pipe 4 for injecting lubricating oil used for lubricating the engine into the concave portion 3.

Among them, the pipe 4 is inserted from the side of the cylinder head 1 (from the left side in the drawing) to a position passing above the recess 3 and is fixed thereto. A plurality of injection holes 4a are located in the position facing the recess 3.
Are formed.

On the other hand, the lubricating oil for cooling the cylinder head (arrow A) is pumped into the pipe 4 from the side of the cylinder head 1 via an oil pump (not shown), and is injected into the recess 3 from the injection hole 4a of the pipe 4. .

Further, the injected lubricating oil (arrow B) absorbs the heat around the combustion chamber where the temperature becomes highest in the cylinder head, and thereafter, is not shown through a discharge hole 5 formed on the side of the cylinder head 1. It is returned to the oil pan (arrow C).

In FIG. 3, reference numeral 6 denotes a camshaft disposed above the combustion chamber 2, 4b denotes a lubricating oil supply hole formed in the pipe 4, and the hole 4b is a journal of the camshaft 6 through a passage 7. And supplies the lubricating oil to the journal. In FIG. 3, reference numeral 16 denotes a plate that covers the opening surface of the concave portion 3 and prevents the injected lubricating oil (arrow B) from adhering to the valve mechanism.

On the other hand, according to the cylinder head cooling device described above, the injection hole 4a formed in the pipe 4 needs to accurately inject the lubricating oil (arrow B) to a predetermined position in the recess 3;
For this reason, it is required that the mounting position of the pipe 4 with respect to the concave portion 3 be strictly controlled.

In order to position the pipe 4 in the conventional cylinder head cooling device described above, a substantially L-shaped notch is formed at the distal end of the pipe 4 as shown in FIG. 4c, the notch 4c is engaged with a bolt 8 for attaching a cylinder head cover (not shown) to the cylinder head 1, thereby restricting the circumferential movement of the pipe 4 and the left side of the cylinder head 1. A flange 9 for retaining the pipe 4 is fixed to the surface 1a with a pair of bolts 10, thereby restricting the movement of the pipe 4 in the axial direction. The flange 9 has a substantially L-shaped pipe 11 communicating with the pipe 4.
Is connected to the other end of the substantially L-shaped pipe 11.
A rubber hose 13 for supplying lubricating oil is connected via 12.

In FIG. 4, reference numeral 14 denotes a pipe 4 and a substantially L-shaped pipe.
An O-ring 15 for preventing leakage of lubricating oil at a connection portion with the numeral 11 is a bolt for attaching a cylinder head cover (not shown) to the cylinder head 1 like the bolt 8.

[Problems to be solved by the invention]

By the way, according to the conventional cylinder head cooling device described above, in order to position the pipe 4, at least the flange 9 for restricting the axial movement and a pair of bolts 10 for fixing the flange 9 must be used. For this reason, the production of the cylinder head cooling device has a problem in that the number of parts and the number of assembling steps increase.

The present invention has been made in view of the above circumstances, and has as its object to provide a cylinder head cooling device in which the number of parts and the number of assembly steps are reduced as much as possible.

[Means for solving the problem]

In order to achieve the above-mentioned object, according to the present invention, a notch having a substantially U-shaped cross section is formed on a peripheral surface of a pipe in which a lubricating oil injection hole is formed, and the notch is arranged in a cylinder head. Bolts.

[Action]

According to the above-described pipe, the circumferential and axial movement of the pipe is restricted by the notch having a substantially U-shaped cross section that engages with the bolt. At a predetermined position.

〔Example〕

Hereinafter, an embodiment of the cylinder head cooling device according to the present invention will be described in detail.

FIG. 1 is a conceptual sectional view of a main part showing a state in which a lubricating oil injection pipe 20, which is a main component of a cylinder head cooling device according to the present invention, is mounted on a cylinder head 1, and the same parts as those in FIG. Indicated by

The lubricating oil injection pipe 20 is a conventional lubricating oil injection pipe 4 shown in FIG.
And the pipe 4 of the prior art.
An injection hole 20a that performs the same function is formed at the same position as the injection hole 4a formed at the bottom.

As shown in FIG. 2 which is an enlarged view of this pipe 20, the left end is bent in a substantially L-shape, and bolts 21 (FIG. 1) for attaching a cylinder head cover (not shown) to the cylinder head 1 are provided. A notch 20b having a substantially U-shaped cross section is formed on the peripheral surface at the position where the is inserted. The bolt 21 shown in FIG. 1 is formed longer than the bolt 15 shown in FIG. 4 so as to engage with the notch 20b having a substantially U-shaped cross section, and the tip reaches a deep position. Needless to say.

As shown in FIG. 1, a rubber hose 13 for supplying lubricating oil is connected to the left end of the pipe 20, and the rubber hose 13 is fixed thereto by a tridon 22, which is a fastening member.

In FIG. 2, reference numeral 23 denotes a groove formed along the circumferential direction, in which an O-ring 24 is fitted as shown in FIG. Leakage of lubricating oil when installed is prevented. In FIG. 2, reference numeral 24 denotes an annular rib for tightening the tridon 22, and reference numeral 25 denotes a third rib.
Hole for lubricating oil supply formed in conventional pipe 4 shown in FIG.
A hole for supplying lubricating oil formed at the same position as 4b and performing the same function.

According to the pipe 20 of the cylinder head cooling device according to the present invention described above, the notch 20b having a substantially U-shaped cross section engages with the bolt 21 for attaching the cylinder head cover to the cylinder head 1 as shown in FIG. Because
The circumferential movement of the pipe 20 is regulated by the contact of the bolt 21 with the portion 20c corresponding to the bottom of the notch 20b, and the movement of the pipe 20 in the axial direction is also lateral to the notch 20b. Since the corresponding portions 20d and 20e are regulated by the contact between the bolts 21 and the bolts 21, the injection holes 20a formed in the pipe 20 are used to accurately inject the lubricating oil to a predetermined position facing the recess 3 shown in FIG. It will be positioned and supported.

In addition, the bolt 21 for attaching the cylinder head cover to the cylinder head 1 is used as the bolt to be engaged with the notch 20b. However, the present invention is not limited to the above-described embodiment, and the essential point is that the bolt 21 is provided inside the cylinder head. As long as the bolts are arranged, they may be engaged with any bolts.

〔The invention's effect〕

As described above, in the present invention, a notch having a substantially U-shaped cross section is formed on the peripheral surface of the pipe in which the lubricating oil injection hole is formed, and the notch is provided with a bolt disposed in the cylinder head. In order to perform positioning and support in the circumferential and axial directions of the pipe by engaging with the flange, a flange for restricting the axial movement of the pipe as in the conventional example and a pair of flanges for fixing this flange. Parts such as bolts are not required, and the number of parts and the number of assembling steps are greatly reduced. Therefore, the productivity of the cylinder head cooling device can be improved, and the production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual cross-sectional view illustrating a main part of a cylinder head cooling device according to the present invention, FIG. 2 is an enlarged plan view of a pipe which is a main component of the cylinder head cooling device according to the present invention, and FIG. FIG. 4 is a sectional view of a main part of a cylinder head showing a conventional cylinder head cooling device.
It is an expanded sectional view. 1 ... cylinder head, 2 ... combustion chamber, 3 ... recess, 20
…… Pipe, 20a …… Injection hole, 20b …… Notch, 21 …… Bolt.

Claims (1)

(57) [Claims] 1. A cylinder having a recess formed above a combustion chamber of a cylinder head, and a pipe provided in the cylinder head and having a peripheral surface formed with an injection hole facing the recess. In the four-stroke engine cylinder head cooling device, in which the lubricating oil pumped to the cylinder is injected from the injection hole into the concave portion to absorb heat remaining around the combustion chamber, a cross section is formed on a peripheral surface of the pipe. A substantially U-shaped notch is formed, and the notch is engaged with a bolt arranged in the cylinder head to position and support the pipe in the cylinder head. Cylinder head cooling device for 4-cycle engine.