JPS5832036Y2 - rubber butt - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rubber bushing that effectively absorbs and alleviates reaction force.

When using compressed air-powered rock drills, pitching hammers, etc., the impact force is transmitted to the worker as a reaction force, causing white wax disease.

As a countermeasure to this problem, a rubber bushing is used, and a considerable effect has been obtained, but the damping of the rubber bushing alone is small, and it is desired to add even larger damping.

The present invention meets this demand and is characterized by adding a buffering force by hydraulic pressure to the rubber elasticity.

Embodiments of the present invention will be described below with reference to the drawings.

The rubber bush main body 1 is formed into an inner and outer double cylinder structure, including an inner cylinder 2 fixed to a rock drill having a chisel shank, and an outer cylinder 3 fixed to a handle of the rock drill.
In the space between the inner and outer cylinders 2 and 3, an annular rubber 4 is fixed on the inner and outer peripheries by baking or other means.

An annular lid 5 that closes the openings of the inner and outer cylinders 2 and 3 is slidably inserted into the space between the inner and outer cylinders 2 and 3 at a predetermined distance from the rubber 4 in the axial direction. Airtightness between the inner peripheral surface of the outer cylinder 3 and between the lid 5 and the outer peripheral surface of the inner cylinder 2 is maintained by a sealing member 6 attached to the lid 5.

Reference numeral 7 denotes a retaining ring that prevents the lid 5 from being pulled out from the opening side of the inner and outer cylinders 2 and 3.

Reference numeral 8 denotes a spring whose one end is in elastic contact with a spring receiver 3' provided at the end of the outer cylinder 3, and the other end of the spring 8 is in elastic contact with the back side of the lid 5, so that the lid 5 is always attached to the left side in the figure. It is strong.

An oil chamber 9 filled with oil is formed between the inner and outer cylinders 2 and 3 by the rubber 4, the inner and outer cylinders 2 and 3, and the lid 5.
The lid 5 is constantly pressurized by a spring 8.

Reference numeral 10 denotes an annular partition plate. One of the inner and outer circumferences of the partition plate 10 is attached to the cylinder by welding or the like, and the other side is slidable relative to the cylinder, and the inside of the oil chamber 9 is divided into two parts. Define heavy A and B.

Further, the partition plate 10 is provided with an orifice 11 that communicates between the two defined wheels A and B.

When this device is applied to a rock drill for work, a reaction force due to the impact force is applied between the inner and outer cylinders 2 and 3, and the inner and outer cylinders 2.3 tend to make periodic movements relative to each other in the axial direction.

At this time, the volumes of oil chambers A and B change periodically,
Since the oil moves to the other oil chamber through the orifice 11, a resistance force is generated when the oil passes through the orifice 11.

This resistance force works in conjunction with the elasticity of the rubber 4 to dampen vibrations between the inner and outer cylinders 2 and 3.

Incidentally, volume compensation when the oil moves between the oil chambers is performed by moving the lid 5 in the axial direction of the cylinder.

In the example, the case where it was applied to a rock drill was explained.
The rubber bushing of the present invention can be applied to a device in which periodic motion in the axial direction occurs between the inner and outer cylinders 2 and 3 and it is necessary to dampen vibrations between the inner and outer cylinders 2 and 3.

As described above, the present invention generates a hydraulic resistance force as the inner and outer cylinders move in the axial direction, and adds this to the elasticity of the rubber to absorb and alleviate the force applied between the inner and outer cylinders. It is possible to minimize the transmission of force between the inner and outer cylinders, and is highly effective when applied to working machines where white wax occurs.

[Brief explanation of the drawing]

The drawing is a sectional view of a rubber bushing according to the present invention. 2... Inner cylinder, 3... Outer cylinder, 4...
...Rubber, 5...Lid, 9...Oil chamber, 1
0... Partition plate, 11... Orifice.

Claims (1)

[Scope of utility model registration request] Rubber is provided at a predetermined interval in the axial direction in the inner and outer space formed by the inner and outer cylinders, and a slidable lid is provided in the inner and outer space to form an oil chamber between the two members. a partition plate is fixed to either the outer periphery of the inner cylinder or the inner periphery of the outer cylinder to double the interior of the oil chamber, and the partition plate has an orifice that communicates the two oil chambers. A rubber bushing characterized by forming a .