JPH0242904Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] Hydraulic vibration isolation is used to support pipes, etc., in order to suppress only sudden vibrations such as earthquakes, without restraining gradual displacement due to temperature changes. equipment is widely used. The present invention relates to an oil container attached to this vibration isolator, and is intended to completely prevent the intrusion of moisture and dust.

[Conventional technology]

Since the oil level in the oil container rises and falls due to the operation of the vibration isolator, it is necessary to leave an appropriate space at the top and communicate it with the atmosphere. The conventional method was to drill pores in the lid, but even if improvements were made to the position and structure of the pores, it was not possible to prevent moisture from entering along with the air, and this moisture would flow to the bottom of the oil container. The particles settled into the vibration isolator cylinder, causing a decline in the performance of the vibration isolator.

[Means for solving problems]

Instead of drilling a vent hole in the lid of the oil container, ventilation was now allowed to flow to the top of the oil container via a hollow rod inserted from below. In addition, the water and dust separated in the long hollow rod are directly discharged to the outside of the oil container.

〔Example〕

The drawings will be explained. The hydraulic vibration isolator connects one end of the cylinder C and the rod R to the structure and the other to the piping. The oil in both chambers of the piston P is combined into an oil pipe K via a valve V, and is connected from there to an oil container.

In the oil container, case 1 has upper lid 1a and lower lid 1b.
It is sealed by. The hollow rod 2 passes through the lower lid 1b, extends into the case, and is fixed to the lower lid. The hollow rod 2 includes an upper lid part 2a and a lower lid part 2b, and has a cavity 2c in the center. The tightening bolt 3 consists of a plug portion 3a and a threaded portion 3b. The plug part 3a is inserted into a hole made in the upper lid 1a while maintaining airtightness. The threaded portion 3b is screwed into a screw hole drilled in the upper lid portion 2a. A passage 4 is bored in the lower lid portion 2b, and communicates the oil pipe K with the inside of the bottom surface of the case 1. A passage 5 is separately formed in the lower lid part 2b, and communicates the cavity 2c with the outside air below the hollow rod. That is, its open end is located below the lower lid 1b. In addition, the threaded portion of the tightening bolt 3 has an air groove 3c that communicates the air chamber in the upper part of the case with the cavity 2c.
is provided.

The present invention is constructed as described above. Piston P
When the rod R reciprocates, the fluctuating volumes of the two chambers differ by the volume occupied by the rod R, which causes the liquid level in the case to rise and fall through the oil pipe K. At this time, outside air enters and leaves the upper part of the case through the passage 5, the cavity 2c, and the air groove 3c. After the incoming air passes through the cavity 2c, it is squeezed by the air groove 3c, so that most of the moisture and dust are separated during this time and flow out from the cavity to the outside world. In Fig. 2, the lower end of the case 1 is extended into a skirt shape below the lower lid to drain outflowing water. Further, in the figure, an annular cut is provided on the outer periphery of the hollow rod 2, and this is made so that the internal oil level height can be visually detected when the tightening bolt is removed.

〔effect〕

The oil inside the case is protected from moisture and dust, allowing the performance of the vibration isolator to be maintained over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a front view of the hydraulic vibration isolator, and FIG. 2 is a front view of the oil container. 1...Case, 1a...Top lid, 1b...Lower lid, 2...Hollow rod, 2a...Top lid part, 2b...
Lower lid part, 2c...Cavity, 3...Tightening bolt, 3
a...Plug part, 3b...Threaded part, 3c...Air groove, 4...Oil passage, 5...Air passage.

Claims (1)

[Scope of utility model registration request] It consists of an airtight case to which a top lid and a bottom lid are fixed, a hollow rod that passes through the bottom lid and is fixed and has a top lid part and a bottom lid part, a plug part and a screw part, and the former goes into a hole bored in the top lid of the case. inserted airtight,
In the latter case, there is a tightening bolt that screws into the threaded hole drilled in the upper lid of the hollow rod, an oil passage that communicates the oil pipe installation hole at the lower end of the lower end of the hollow rod with the oil surface above it, and a threaded part of the tightening bolt. An oil container for a hydraulic vibration isolator, which includes an axial air groove and an air passage that communicates between the upper surface of the lower lid of the hollow rod and the lower atmospheric surface.