JPH0342264Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a damper for damping and transmitting vibrations, earthquakes, etc., and in particular, a friction type screw with a rotating body and a screw shaft that has high damping efficiency. Regarding U-damper.

(Problems to be solved by conventional technology and ideas) Conventionally, there is a hydraulic oil damper as a cylindrical damper, but the oil becomes hot due to vibration and its properties change easily. For curing, the operating temperature is -20℃~80℃
Since shaft deformation is replaced by oil pressure, it tends to be sensitive to changes in oil volume due to temperature changes.Since oil is used, regular inspections must be taken to maintain functionality. The use of oil in nuclear power plants and thermal power plants, where high temperatures are generated, is dangerous.
There are problems such as the damping of the oil damper is at most about h=20%.

(Means for Solving the Problems) The present invention has been made in view of the above points, and provides a friction type screw damper that has high damping ability and does not require periodic inspection or repair.

The present invention consists of an outer shell cylinder having a handle at one end, an inner shell cylinder having a handle at one end that advances and retreats in the axial direction within the outer shell cylinder, and a plurality of friction plates disposed within the outer shell cylinder. a bottomed cylindrical rotating body that rotates in sliding contact with the inner wall of the outer shell cylinder;
one end of which is in rigid contact with the bottom of the rotating body, and the other part of which is slidably screwed into a screw groove provided in the end wall of the inner shell cylinder; This is a friction type screw damper characterized by a plurality of spring bodies inserted into the gap between the body and the body.

(Example) An example of the present invention will be described below based on the drawings.

Fig. 1 is a longitudinal sectional view of a friction type screw damper according to an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a partially enlarged view of Fig. 2, and Fig. 4 is an external view of a bottomed cylindrical rotating body.

In the drawing, 1 is an outer shell cylinder, 1a is its handle, 2 is an inner shell cylinder, 2a is its handle, 2b
3 is an end wall, 3 is a bottomed cylindrical rotating body, 3a is a long groove,
4 is a ball screw shaft, and 5 is a ring-shaped rail. In addition, 30 is a friction plate having an approximate cross-section and an arc-shaped outer surface at the bottom, 31 is an inner wall of the friction plate, 32 is a vertically long ridge thereof, 33 is a compressed spring, and 1b is an outer shell cylinder wall. 1c is a stop at the end thereof, and 2c is a stopper.

The ring-shaped rail 5 is provided between the bottom surface of the bottomed cylindrical rotating body 3 and the outer shell cylinder 1, and is used to ensure stable rotation of the rotating body 3. The shaft 4 is rotatably supported by a ball nut (not shown) in the inner cylinder end wall 2b.

A long groove 3 cut on the outer periphery of the bottomed cylindrical rotating body 3
The longitudinally elongated protrusion 32 of the friction plate 30 is loosely fitted into a.
Furthermore, since a compression spring 33 is inserted into the gap between the friction plate 30 and the rotating body 3, the friction plate 30 is pressed against the outer shell cylinder wall portion 1b with an appropriate pressure, so that the friction plate 30 is constantly pressed between the two. A frictional force is applied. The bottom outer surface of the friction plate 30, which has an approximately shaped cross section, forms an arcuate curved surface corresponding to the curved surface of the inner wall surface of the outer shell cylinder 1b.

In the screw damper having the above configuration, when an axial tensile force or compressive force such as vibration or impact force acts between the outer shell cylinder 1 and the inner shell cylinder 2, the axial force is It is not directly transmitted to the cylinder, but is transmitted via the bottomed cylindrical rotating body 3 and the screw shaft 4.

That is, when an axial force is applied, the bottomed cylindrical rotating body 3 and the ball screw shaft 4 rigidly connected thereto rotate, and the axial force is applied to the outer shell cylinder 1 and the bottomed cylindrical rotating body. Spring 3 linked from 3
3, it becomes frictional energy at the sliding contact surface with the friction plate 30 and is attenuated.

At this time, it is desirable that the sliding contact surface between the outer shell cylinder 1 and the friction plate 30 is a friction surface that allows appropriate rotation. A compression spring 33 is inserted and compressed to generate an opening force. Note that it is preferable that the shaft support surface between the screw shaft, which is in rigid contact with the bottomed cylindrical rotating body 3, and the inner shell cylinder 2 has less frictional resistance because it is easier to convert the force in the axial direction into the force in the rotational direction. It is preferable to employ a so-called ball screw in which the grooves of the male and female screws forming the shaft support surfaces are opposed to each other, and steel balls are loaded into the spiral grooves to reduce frictional resistance.

As described above, in this example, linear motion such as axial vibration is converted into rotational motion accompanied by sliding friction between the outer shell cylinder 1 and the rotating body 3, resulting in a large damping effect. .

Since the structure is simple and the mechanical properties of steel are used, it can be used in thermal power plants and nuclear power plants.

(Effect of the invention) As described above, the present invention includes an outer shell cylinder having a handle at one end, an inner shell cylinder having a handle at one end that advances and retreats in the axial direction within the outer shell cylinder, and a a bottomed cylindrical rotating body that rotates in sliding contact with the inner wall of the outer shell cylinder via a plurality of friction plates; A friction type screw comprising a screw shaft slidably screwed into a thread groove provided in the screw, and a plurality of spring bodies inserted into the gap between the friction plate and the rotating body. Since it is a damper, it has a simple structure and is easy to assemble, and since it utilizes the mechanical properties of steel, it can be used in thermal power plants, nuclear power plants, etc. .

Since the damping mechanism is shielded within the cylinder, it is maintenance-free and does not require periodic inspection. Furthermore, the damping effect can be expected to be h=40 to 50%.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a friction type screw damper according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
The figure is a partially enlarged view of FIG. 2, and FIG. 4 is an external view of the bottomed cylindrical rotating body. 1: Outer shell cylinder, 1a: Outer shell cylinder pull,
1b: Outer cylinder wall, 1c: Stop, 2: Inner cylinder, 2a: Inner cylinder pull, 2b: End wall, 2c: Stopper, 3: Bottomed cylindrical rotating body, 4: Ball screw Shaft, 5: Ring-shaped rail, 30: Friction plate, 31: Inner wall of friction plate, 32:
Vertical ridge, 33: Compression spring.

Claims (1)

[Claims for Utility Model Registration] (1) An outer shell cylinder having a handle at one end, an inner shell cylinder having a handle at one end that advances and retreats in the axial direction within the outer shell cylinder, and A cylindrical rotating body with a bottom that rotates in sliding contact with the inner wall of the outer cylinder through a plurality of friction plates, one end of which is in rigid contact with the bottom of the rotating body, and the other part of which is in contact with the end wall of the inner cylinder. A friction type comprising a screw shaft that is slidably screwed into a thread groove provided therein, and a plurality of spring bodies are inserted into the gap between the friction plate and the rotating body. Screw damper. (2) The friction plate is a horn-shaped body with an approximate cross-section and an arcuate curved surface at the bottom, the rotating body has a plurality of long grooves in the axial direction on its outer periphery, and the longitudinally elongated edges on both sides of the friction plate are The friction type screw damper according to claim 1, wherein the friction type screw damper is loosely fitted into the long groove of the rotating body. (3) Utility model registration claim 1 characterized in that the screw shaft is a ball screw shaft
The friction type screw damper according to item 1 or 2.