JPH0740664Y2 - Anti-vibration and steady structure of engine generator - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an anti-vibration and steady rest structure for a generator with an engine, a portable working machine with an engine and the like.

[Conventional technology]

 Conventional examples are shown in FIGS. 2 and 3.

In the figure, an engine 2 is set on a frame 1 via a vibration-proof rubber 3. There is a stopper 4 integrally attached to the engine side in the vicinity of the anti-vibration rubber 3 and is inserted into the slit portion 1 ′ of the frame 1.

When there is a relative displacement between the frame 1 and the engine 2, the amount of deformation of the anti-vibration rubber is regulated by the gap size between the slit portion 1 ′ of the frame and the insertion portion of the stopper 4.

[Problems to be solved by the device]

In generators with an engine, it is common to provide a vibration-proof rubber between the engine and the external frame to prevent the vibration generated by the engine from being transmitted to the external frame, but portability is required. In the case of generators with engines, low frequencies (about 5 Hz to 30 Hz) from the frame side during transportation
May be subject to vibration.

The anti-vibration rubber to obtain the anti-vibration effect during normal operation is unavoidable at the resonance point in this low frequency range, and the vibration and resonance of the internal engine part with a large amplitude against external vibration. If vibration is generated for a long time in this state, there is a problem in durability of the anti-vibration rubber and vibration resistance of the engine part and the generator part.

Further, in the structure of FIGS. 2 and 3 described above, the stopper 4
And the frame 1 may come into contact with each other and generate a metallic sound.

An object of the present invention is to provide a steady rest structure effective for low-frequency vibration in an engine-equipped work machine using a vibration-proof rubber.

[Means for Solving the Problems]

A cylindrical stopper is provided on the lower side of the generator side, a cylindrical rubber bush is provided on the frame side via a pin, and the bush is loosely fitted in the stopper, and there is a runout from the frame side during transportation such as in a vehicle. When the vibration exceeds the swing range, the rubber bush on the frame side contacts the stopper on the generator side to prevent steadying.

[Action]

The rubber bush suppresses vibrations that exceed a certain amplitude from the frame side that occur during transportation. Therefore, originally, the anti-vibration rubber for preventing the vibration from the generator side is protected, and the interference of the frame and the like close to the generator is prevented.

〔Example〕

In FIG. 1, 10 is a frame, 10a is a pin implanted in the frame 10, 11 is an anti-vibration rubber, 13 is a generator, L is a generator 13
, 15 is a plate attached to the bottom of the generator 13, 15
Reference numeral a is a cylindrical tubular body planted in the plate 15, and reference numeral 20 is a rubber bush attached around the pin 10a.

The plate 15 is sandwiched between the generator 13 and the anti-vibration rubber 11 and fastened together with the nut 12. The tubular body 15a is fixed to the center of the plate 15, that is, on the center line L of the generator 13 by welding or the like.

The rubber bush 20 is fitted on a pin 10a fixed to the frame 10 by welding or the like. The height of the pin 10a is lower than the height of the rubber bush 20. The pin 10a is arranged so as to be at the center of the cylindrical body 15a protrudingly provided on the lower surface of the plate 15. Rubber bush 20
The cylinder 15a of the plate 15 and the plate 15 are dimensioned so as to allow a predetermined clearance.

Next, the operation of this device will be described.

During normal operation, the anti-vibration rubber 11 is used for anti-vibration. Vibration from the frame 10 side during transportation is isolated by the anti-vibration rubber 11, and when the amplitude becomes large, the rubber bush 20 and the tubular body 15 of the plate 15
It interferes with a and stops the shake. Anti-vibration rubber for vertical vibration 1
Although the vibration is suppressed by 1, the large amplitude prevents the vibration by the interference between the upper end of the bush 20 and the plate 15.

The pin 10a may be provided on the plate 15 side and the tubular body 15a may be provided on the frame 10 side.

[Effect of device]

As described above, according to the present invention, one of the frame or the engine-generator, which is located near the center line of the engine-generator, is provided with the rubber bush attached to the pin in an externally inserted state. Since a cylindrical tubular body is provided that is loosely fitted with a gap between them, the steady rest is a tubular body and the upper part is not open, so there is no need to fix the steady rest, and the assemblability is good and the number of parts However, since the contact between the steady rest and the steady rest is a tubular portion, there is no local contact, the steady rest is not damaged, and durability and reliability are improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of an embodiment of the present invention, FIG. 2 is a schematic view showing a conventional structure, and FIG. 3 is a view on arrow A of FIG. 10 …… frame, 11 …… anti-vibration rubber 10a …… pin, 11 …… generator 15 …… plate, 15a …… cylindrical 20 …… rubber bush

Claims (1)

[Scope of utility model registration request] 1. A prime mover mounted on a frame via a vibration-proof rubber, wherein the pin is externally attached to one of the frame and the prime mover located near a center line of the prime mover. 2. A vibration-proof / anti-vibration structure for an engine generator, characterized in that a rubber bush mounted on the other side is provided, and a cylindrical tube body loosely fitted to the outer periphery of the rubber bush is provided on the other side.