JPH0114752Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an engine in which a pair of cylinders are arranged in a V-shape.

(Prior art and its problems) In the conventional V-type engine, for example,
52-149932, the upstream opening of the intake passage of the cylinder head is provided on the inside side of the V bank, and therefore the carburetor is far away from inside the V bank in relation to the intake manifold, etc. It sticks out, making the entire engine larger.

In addition, since the mounting surfaces of the intake manifolds to the cylinder heads on both sides are perpendicular to each other, it is difficult to absorb dimensional variations during processing and assembly, and as a result, problems remain in maintaining the sealing performance of the mounting surfaces. .

(Means for solving the problem) In order to solve the above problem, the present invention opens the upstream opening of the intake passage provided in each cylinder head on the end face of the cylinder head in the crankshaft direction, and connects the carburetor to both sides. It is arranged in a V-bank formed between the cylinders, and the intake passage openings of both cylinder heads and the carburetor are connected by an intake manifold, and the intake confluence part in the intake manifold is located close to the center bottom of the V-bank.

(Example) Fig. 1 is a top view of a vertical shaft V-type engine to which the present invention is applied. In Fig. 1, a crankshaft 1 is arranged vertically so as to extend in the vertical direction, The pair of cylinders 2, 2 are arranged in a V-shape, and a cylinder head 3, 3 is fastened to the head of each cylinder 2, 2, respectively.

Upstream openings 5, 5 of the intake passage within the head 3 are formed at the end faces (upper end faces) in the crankshaft direction of each cylinder head 3, 3, respectively. A carburetor 6 is disposed within a V bank formed by mutually opposing side walls 2a, 2a of both cylinders 2, 2. The outlet of the carburetor 6 and both intake passage openings 5, 5 are connected by a bifurcated intake manifold 8. The outlet portions at both ends of the intake manifold 8 each have flange portions 8a, 8a,
It is fixed to the intake passage openings 5, 5 of the heads 3, 3. The mounting surfaces of the flanges 8a, 8a, that is, the mounting surfaces of the openings 5, 5 are substantially aligned with the same plane perpendicular to the crankshaft 1. Intake manifold 8
The intake merging portion 8b is close to the center bottom of the V bank, and is connected to the carburetor 6 at the merging portion 8b.

In FIG. 2, an air cleaner 10 is arranged above the carburetor 6.
0 is connected to a carburetor 6 via an intake pipe 11. The air intake port 10a of the air cleaner 10 is located inside the fan housing 12. 13 is an element, 14 is a flywheel, and 15 is a cooling fan.

(Function) Air taken in from the air cleaner 10 passes through the intake pipe 11 and enters the carburetor 6. After mixing with fuel, it enters the intake manifold 8 and branches. 2,2 is supplied to the inside.

(Another Embodiment) The present invention can also be applied to an engine with a horizontal horizontal crankshaft.

(Effect of the invention) As explained above, the present invention opens the upstream opening of the intake passage provided in each cylinder head to the end face of the cylinder head in the crankshaft direction, and the carburetor is formed between both cylinders. It is arranged in a V-bank, and the intake passage openings of both cylinder heads and the carburetor are connected by an intake manifold, and the intake confluence in the intake manifold is located close to the center bottom of the V-bank. There are advantages.

(1) The carburetor can be completely housed within the V bank, making the engine more compact.

(2) Both mounting surfaces of the intake manifold to the cylinder heads on both sides can be made to be approximately the same plane or parallel surfaces with little difference in level. Therefore, when the mounting surfaces are perpendicular to each other as in the conventional case, In comparison, it becomes easier to attach the intake manifold to the cylinder, and the sealing performance of the attachment surface can be maintained at a high level.

(3) Vibration resistance is improved because the amount of outward overhang of the carburetor and air cleaner is reduced.

[Brief explanation of the drawing]

Fig. 1 is a top view, partially in section, of a vertical-axis V-type engine to which the present invention is applied, and Fig. 2 is the same as Fig. 1.
FIG. 1...Crankshaft, 2,2...Cylinder, 3,3...Cylinder head, 5,5...
Opening part, 6...carburetor, 8...intake manifold, 8b...merging part.

Claims (1)

[Scope of utility model registration request] In an engine in which a pair of cylinders are arranged in a V-shape, the upstream opening of the intake passage provided in each cylinder head is opened at the end face of the cylinder head in the crankshaft direction, and the carburetor is connected to the V-shape formed between both cylinders. The V-shape is arranged in a bank, and the intake passage openings of both cylinder heads and the carburetor are connected by an intake manifold, and the intake confluence part in the intake manifold is located close to the center bottom of the V bank. engine.