JPS5849420Y2 - Intake system for horizontal multi-cylinder engine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an intake system for a horizontal multi-cylinder engine in which an air cleaner is supported by the engine body.

Conventionally, in horizontal multi-cylinder engines, lζ
An intake port 1 is opened on the upper surface side of the head block 2.

For this reason, the air cleaner 3 is disposed above the head block 2 as shown in the figure, and with respect to the intake port 1.
They were communicated via an S-shaped intake pipe 4.

However, with this structure, the intake passage at the intake pipe 4 has a steep bend, which causes a large intake resistance, and the air cleaner 3 is supported by the head block 2 via the intake pipe 4, causing the air cleaner 3 to reach the fixed wall. Since the distance to the mounting part is long, it is easy to float, and the connection part between this and the intake pipe 3, or the joint part between the intake pipe 3 and the head block 2, has the disadvantage of early fatigue failure.

In order to eliminate the above-mentioned drawbacks, this invention fixes the head block and rocker cover in order to one end of the crankcase.The intake passage is integrally formed within the rocker cover, and the inner end of this intake passage is connected to the head block. At the same time, the outer end of the intake passage is opened at the outer end surface of the rocker cover, and the outer end of the intake passage is connected to the front half of the bonnet support bracket extending upward from the crankcase above the head block. The air cleaner is supported via an air cleaner flange, and an outlet pipe protruding almost laterally from the air cleaner and an intake port opening on the outer end surface of the rocker cover are communicated and connected via an intake pipe with a large radius of curvature. It is characterized by what it did.

Examples of this invention will be described below with reference to the drawings.

FIG. 2 is a longitudinally folded front view of the main parts of a water-cooled horizontal two-cylinder diesel engine, and FIG. 3 is a side view of the same engine.

According to the drawing, the engine includes a piston 13, a crankshaft 14, and a camshaft 15 inside a crankcase 10, a head block 11 and a rocker cover 12 fixed in order to the side ends of the crankcase 10.
, and accommodates moving members such as the valve train 16.

An intake port 18 opened and closed by an intake valve 17 and an exhaust port 20 opened and closed by an exhaust valve 19 are formed inside the head block 11.

As shown in FIG. 4, the intake port 18 is branched within the head block 11 and communicates with the front and rear combustion chambers 21.

An intake passage 22 is formed continuously from the intake port 18.

The intake passages 22 are formed integrally with the rocker cover 12 so as to penetrate through the rocker cover 12.
A joint pipe 23 is press-fitted and fixed to the end portion of the pipe 2 that opens to the outer end surface of the pipe 2 .

As shown in FIG. 3, an oil path type air cleaner E is disposed at the upper part of the head block 11 near the front side.

This air cleaner E has an artificial pipe 25 protruding from the upper end surface of a main body 24 that houses an air cleaner element (not shown).
An outlet pipe 26 is provided protruding from the rear side of the circumferential surface of the main body 240, and an oil pan 2T is detachably attached to the lower end of the outlet pipe 26.

In order to support this air cleaner E, an air cleaner flange 28 is provided.

As shown in FIG. 2, the air cleaner flange 28 is a bracket (fixed wall) that supports the engine bonnet 29.
It is fixed with bolts in the first half of the 30's.

This air cleaner flange 28 is formed by integrally forming a mounting portion 31, a tapered tubular relay passage 32, a joint portion 33 and a joint pipe portion 34 formed at both front and rear ends of this passage 32 by casting.

The outlet pipe 26 of the air cleaner E is connected to the above-mentioned joint 33 and fixed with bolts.

Further, the joint pipe portion 34 is communicated with the joint pipe 23 at the end of the intake passage 22 described above via an intake pipe 35 formed with an elastic material such as rubber and having a large radius of curvature.

In the figure, reference numeral 36 is a muffler, 37 is a radiator, 38 is a fuel tank, and 40 is a fuel injection nozzle.

FIGS. 5A and 5B show another embodiment, and the one shown in FIG.
This embodiment differs from the above embodiment in that the two are directly connected.

The one shown in FIG. 1B differs from the above-described embodiments in that the trunk of the main body 24 of the air cleaner E is supported by an air cleaner flange 28 in a cradling manner.

As explained above, in this design, the air cleaner is supported above the head block by the front half of the bonnet support bracket extending from the crankcase via the air cleaner flange, so that the center of gravity of the air cleaner is located at the mounting part of the air cleaner flange. By reducing the distance between the air cleaner and the air cleaner, it is possible to prevent the air cleaner from shaking and to prevent the air cleaner mounting portion or the air cleaner flange from being destroyed due to fatigue.

In addition, since the air cleaner flange is provided above the head block and the air cleaner supported by the air cleaner and the intake port are separated from each other, the two are communicated via an intake pipe with a large radius of curvature, and the intake air from the air cleaner to the intake port is communicated with the air cleaner flange. It can reduce the intake resistance of the entire passage and increase the engine's intake efficiency.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view of the main parts of an engine showing a conventional example;
5A and 5B show an embodiment of this invention, FIG. 2 is a longitudinal sectional front view of the main part of the engine, FIG. 3 is a side view of the engine, and FIG. 4 is a line taken along line 1V-1v in FIG. Cross-sectional view, Figure 5A,
B is a side view of main parts showing different embodiments. 10... Crank case, 11... Head block, 12... Rocker cover, 18...
...Intake hood, E...Air cleaner,
26... E outlet pipe, 28... Air cleaner flange, 30... Fixed wall (bracket), 35... Intake pipe.

Claims (1)

[Scope of utility model registration request] 1. A head block 1 is attached to one end of the crankcase 10.
1 and rocker cover 12 in order, and then
An intake passage 22 is integrally formed within the interior of the intake passage 22.
The inner end of the head block 110 is connected to the intake port 18 that opens on the joint surface of the rocker cover, and the outer end of the intake passage 22 is opened on the outer end surface of the rocker cover 12, and the intake passage 22 is opened from the crankcase 10 above the head block 12. The air cleaner E is supported by the front half of the bonnet support bracket 30 that extends upwardly through the air cleaner crange 28, and an outlet pipe 26 that protrudes from the air cleaner E substantially laterally.
An intake system for a horizontal multi-cylinder engine, characterized in that the intake port and the intake port opening at the outer end surface of the rocker cover 12 are connected to each other via an intake pipe 35 having a large radius of curvature. 2. Scope of Utility Model Registration An intake system for a horizontal multi-cylinder engine according to claim 1, in which the outlet pipe 26 of the air cleaner E and the intake pipe 35 are connected for communication via an air cleaner flange 28.