JPS5921354Y2 - Anti-vibration support device for engine frame - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vibration-isolating support device for vibration-proofly supporting an engine on a machine frame via vibration-isolating rubber.

Engines use fuel to drive them and lubricating oil to lubricate them, so oily substances are always left on the outside of the engine due to overflow during injection or leakage from seals. This is transmitted by gravity along the outer wall, collects at the bottom of the engine, and adheres to the anti-vibration rubber.

For this reason, the anti-vibration rubber is made of an oil-resistant material such as synthetic rubber.

However, such oil-resistant materials have low fatigue strength and have a short lifespan as anti-vibration rubber.

If the anti-vibration rubber is made of natural rubber with high fatigue strength in order to extend its life, it will have poor oil resistance and will still have a short life.

In order to solve the above-mentioned drawbacks, this invention prevents the vibration-isolating rubber from being exposed to fuel or lubricating oil, thereby making it possible to form the vibration-isolating rubber with a material that has high fatigue strength even if it has poor oil resistance. The purpose is to improve the durability of the swing support device.

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

Figure 1 is a side view of the engine generator, Figure 2 is the I of Figure 1.
It is a sectional view taken along the line I-II.

In the figure, 1 is a forced air-cooled single-cylinder engine, 2 is a generator driven by the engine 1, and is integrally connected to the engine 1 to constitute an engine generator R.

This engine generator R is housed within the machine frame 3.

The machine frame 3 consists of an opening-shaped frame 3a formed by bending a pair of front and rear pipes, an upper crosspiece 3b having a U-shaped cross section connecting the two, and an engine support frame 3C using pipes.

The fuel tank 4 placed above the engine 1 has a recess in the bottom wall of the tank along the shape of the head 1a of the engine 1, and the bottom wall outside the recess is located below the head 1a, so that the bottom wall matches the shape of the head 1a of the engine 1. The concave portion covers the head 1a, and the mating surfaces 5 thereof are placed on the left and right upper crosspieces 3b of the machine frame 3, and the fuel tank 4 is fixedly supported on the machine frame 3.

6 is a cooling fan that also serves as a flywheel fixed to the end of the crankshaft of the engine 1; 7 is a guide case for cooling air generated by the cooling fan 6; 8 is a muffler; 9 is an exhaust gas that communicates the muffler 8 with the engine 1. Conduit, 10 is muffler 8
It is a cover that covers the upper part of the fuel tank 4 and is fixed to the upper crosspiece 3b continuously to the mating surface 5 of the fuel tank 4.

The engine generator R configured as described above is vibration-proofly supported on the machine frame 3 in the following manner.

That is, three brackets 12 are fixed to the engine support frame 3C of the machine frame 3, and the anti-vibration rubber 11 is attached to the end of the bracket 13, and the anti-vibration rubber is attached to the part 13 on the generator 2 side. The anti-vibration rubber 11 is arranged perpendicularly along the axis of the engine 1.
Each vibration isolating rubber 11 on the side is fixed so that its axis forms an inverted V-shape when viewed from the front.

Reference numeral 14 is a plate fixed to a fixed leg 15 formed at the bottom of the engine 1, and both ends thereof are bent diagonally downward. A rubber attachment portion 16 is formed.

Then, attach the leg screws 17 on the upper side of the vibration isolating rubber 11 to the plate 1.
The anti-vibration rubber attachment 4 is inserted into the screw hole 18 of the part 16 and tightened with a nut 19, and the engine generator R is supported on the machine frame 3 in a vibration-proof manner by each anti-vibration rubber 11.

Reference numeral 20 in the figure is an oil-proof wall formed downward from the periphery of the vibration-proof rubber portion 16 of the plate 14.

Next, the ′ effect will be explained.

The vibration-proof rubber mounting part 16 of the plate 14 is larger than the part 13 in plan view, and the vibration-proof rubber 11 is mounted on the lower side of the part 16. Since it is formed so as to be hidden, even if fuel or lubricating oil falls from above in the form of oil droplets, it will not hit the vibration isolating rubber 11, and it will also prevent fuel or lubricating oil from traveling along the outer wall of the engine 1. It does not adhere to the swing rubber 11.

In addition, since the vibration isolating rubber 11 is fixed in an inverted V-shape, even if the engine 1 is a single cylinder and has large vertical vibrations, the left and right vibration isolating rubbers 11 help each other and provide good vibration isolation.

As a modification of this invention, it is conceivable that the oil-proof wall 20 is provided and extends downward, and further covers the vibration-proof rubber 11 with this oil-proof wall 20.

In this way, it is possible to further prevent fuel or lubricating oil from adhering to the vibration isolating rubber 11.

Since this invention is constructed as described above, it has the following effects.

That is, a mounting plate to be fixed to the engine is positioned on the engine support frame with its outer end protruding outward from the engine body, and the outer end spine of the mounting plate is tilted outward and downward, and the support frame is Position the mounting bracket protruding from the mounting plate parallel to the mounting plate, position the anti-vibration rubber between the mounting plate and the mounting bracket, and connect the anti-vibration rubber mounting part formed on the mounting plate to the anti-vibration rubber and the anti-vibration rubber of the mounting bracket. Since the vibration rubber mounting part is formed to cover the vibration isolation rubber in a plan view, the vibration isolation rubber is located outside of the engine body, and fuel and lubricating oil that have fallen down the outer wall of the engine will not adhere to the vibration isolation rubber. There's nothing to do.

In addition, the mounting part of the mounting plate is slanted outward and downward,
Since it is formed in a size that covers the anti-vibration rubber, even if fuel or lubricating oil may adhere to the mounting plate, the fuel, etc. will not fall from the outer edge of the mounting plate (outside the anti-vibration rubber). This prevents this fuel from adhering to the anti-vibration rubber.

Thereby, the vibration isolating rubber can be made of a material with high fatigue strength even if it has poor oil resistance, so the durability of the vibration isolating support device can be improved.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, in which Fig. 1 is a side view of the engine generator, Fig. 2 is a sectional view taken along the line II-II of Fig. 1, and Fig. 3
The figure is an enlarged view of the main part of FIG. 2, and FIG. 4 is an exploded perspective view of the main part. 1...Engine, 3...Machine frame, 3C...Engine support frame, 11...Vibration isolating rubber, 13.16...Vibration isolating rubber is mounted on the part, 14...Mounted on the plate .

Claims (1)

[Scope of utility model registration request] A mounting plate 14 fixed to the engine 1 is arranged on the support frame 3C so as to protrude outward from the engine 1.
Both ends thereof are inclined outwardly and downwardly to form at least left and right pairs of anti-vibration rubber attachment portions, and anti-vibration rubber attachment brackets 12 are protruded from the engine support frame 3C in parallel with the anti-vibration rubber attachment portions 16. Anti-vibration rubber lower mounting part 13
By arranging the vibration isolating rubber 11 between the mounting parts 16 and 11 located above and below, the vibration isolating rubber 1 of the left and right vibration isolators is
The two axes of 1 are oriented and positioned in an inverted V-shape, and the anti-vibration rubber attachment portion 16 is sized to cover the anti-vibration rubber 11 and the anti-vibration rubber attachment portion 13 located on the lower side in a plan view. An anti-vibration support device for an engine frame, characterized in that: