JPS595153Y2 - horizontal water cooled engine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a horizontal water-cooled engine in which a fuel tank and a radiator are arranged side by side on a crankcase.

Normally, in this type of engine, the fuel tank is supported by a pair of left and right tank brackets that stand upright from the crankcase. ), it rises to a relatively high position above the majority of the fuel tank.

As a result, the tank bracket tends to swing from side to side, resulting in early fatigue failure of the portion where the bracket connects to the crankcase or the fuel tank.

Another disadvantage is that the outer size of the engine becomes larger due to the accommodation space for the tank bracket provided between the radiator and the fuel tank and the protrusion of the tank bracket on the other side from the side of the fuel tank.

The main purpose of this invention is to eliminate the above-mentioned drawbacks, and for this purpose, it is possible to support the fuel tank without using a tank bracket. Specifically, the joint flange of the fuel tank is At the same time, the tank support part is formed integrally with one side end of the crankcase or the side end cover that closes the side end opening of the crankcase, and the fan case. The fuel tank is characterized in that the fuel tank is supported by the support part and the tank support part on the fan case side at their joint flange parts.

Examples of this invention will be described below based on the drawings.

FIG. 1 is a partially cutaway front view of a horizontal water-cooled engine.

In the figure, the engine has a fuel tank 2 and a radiator 3 arranged side by side on the upper surface of a crankcase 1, a die-cast fan case 5 that accommodates a cooling fan 4 in front of the radiator 3, and A flywheel 7 is supported by a crankshaft 6 protruding from approximately the center.

In order to drive the cooling fan 4, a belt transmission consisting of a fan pulley 8 that rotates together with the fan 4, a drive pulley 9 fixed to the inner surface of the flywheel 7, a tension pulley 10, and a V-belt 11. equipment is provided.

As shown in FIG. 1, the fuel tank 2 is formed into an upper tank body 12 and a lower tank body 13, which are divided along a diagonal line that is substantially upward to the right, and is formed into a rectangular parallelepiped shape as a whole.

Both the upper and lower tank bodies 12, 13 are integrated by seam welding joint flanges 14 that protrude from the periphery of each opening.

Attachment holes 15 for fixing the tank are connected to a total of three locations, two locations on the left and right at the bottom end of this joint flange portion 14 and a location on the front side of the top end.

Further, the front part of the joint flange 14 is attached to the flywheel cover 16.
It is extended to cover the top of the.

In order to support the fuel tank 2 configured as above,
a side end cover 17 that covers a side opening of the crankcase 1;
A tank support portion 17A is provided for each of the fan case 5 and the fan case 5.
, 5A is demonstrated.

As shown in FIG. 2, the tank support portions 17A are disposed at two locations on the left and right sides of the upper end of the side end cover 17, and are molded integrally with the cover 17.

Further, as shown in FIGS. 1 and 3, the tank support portion 5A on the side of the fan case 5 is provided protruding from the left shoulder of the periphery of the air guide portion 18 of the fan case 5. It is molded integrally with the base 19 and the like.

Each of the tank support parts 5A and 17A has a screw hole 20 formed therein.

The fuel tank 2 has its joint flange 14 connected to each tank support part 5.
A, 17A is received and fixed by screwing the bolt 21 inserted into the mounting hole 15 into the screw hole 20.

In addition, the fan case 5 is connected to the crank case 1 and the radiator 3.
In addition, the side end covers 17 are firmly fixed to the crankcase 1 with bolts.

FIGS. 4 and 5 each show a modification of the tank support structure.

The one shown in FIG. 4 is shaped by bending the joint flange on the side of the fan case 5 horizontally and the joint flange 14 on the other side vertically, with the latter joint flange 14 protruding from the crankcase 1. It is designed to be supported by the tank support section 1A.

What is shown in FIG. 5 is the tank support portion 5 of the fan case 5.
A is formed into a cross-shaped shape when viewed from above, and this supports the corner portion of the joint flange portion 14, and the corner portion is fixed with two bolts 21.

As explained above, this invention uses a cast fan case that is firmly fixed to the crankcase and has a robust structure itself, and the crankcase or side end cover.
Since the fuel tank is directly supported by the tank support part that is integrally formed in each tank, unlike the previous structure mentioned above, the drawbacks such as early fatigue failure of the tank support parts can be eliminated. can.

Furthermore, by omitting the tank bracket, the engine can be made lighter and its manufacturing cost can be reduced, and in addition, the entire engine can be made smaller by the space taken up by omitting the tank bracket.

Moreover, since the fuel tank is supported by the joint flange, the fuel tank itself is also supported at its strongest point, so there is no reduction in strength and the fuel tank is not damaged by vibrations or the like.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; Fig. 1 is a partially cutaway front view of a horizontal water-cooled engine, Fig. 2 is a partially cutaway side view of the same engine, Fig. 3 is a plan view of the engine, and Fig. 4 is a partially cutaway front view of the horizontal water-cooled engine. and fifth
Each figure is a front view of a main part showing a modified example. 1... Crank case, 2... Fuel tank, 3... Radiator, 4... Cooling fan, 5... Fan case, 17・・・・・・
・Side end cover, IA, 5A, 17A...Tank support part.

Claims (1)

[Scope of utility model registration request] A fuel tank 2 and a radiator 3 are arranged side by side on the crankcase 1, a cast fan case 5 housing a cooling fan 4 is placed in front of the radiator 3, and an opening at the side end of the crankcase 1 is cast. The fuel tank 2 is installed in a horizontal water-cooled engine covered with a C-side end cover 17, and a one-part tank body 12 and a lower tank body 13 are divided by a diagonal line connecting the upper part on the radiator side and the lower part on the end side on the crankcase side. formed with
1. Both lower tank bodies 12 and 13 are joined by a joint flange 14, and tank support parts IA and 5 are attached to the side end side solid wall of the crankcase 1 including the side cover 17 and the fan case 5, respectively.
A, 17A are integrally formed, and both tank support parts 1A, 5
A, 17 A horizontal water-cooled engine characterized in that a joint flange 14 of a fuel tank 2 is tightly held in A.