SU775429A1 - Part threaded connection - Google Patents

Description

one

The invention relates to the field of machine building, to the implementation of electrically insulated threaded connections of parts.

Known electrical insulation washer for the threaded connection of parts c. as a thin-walled ring with flange D-

This washer provides electrical insulation of the bolt from only one connected part.

It is also known to screw the parts with the help of a screw with a countersunk or half-head and an electrically insulating gasket, one half of which is placed between the parts and the second half covers. the edge of the upper part and placed under the screw head 2.

This compound is the most close to the invention in its technical essence and the achieved result.

However, in such a design, the connection cannot ensure reliable isolation of the connected parts due to the possibility of the bolt contacting the part.

The purpose of the invention is to increase the reliability of electrical insulation.

This goal is achieved due to the fact that the hole for the screw in the upper part is made with a diameter equal to d + (1.5-1.3) 5 and with a countersink for the screw head, and the holes for the screw in the gasket are made with a diameter equal to

d, - (O, 2-0.3) 5,

where d is the nominal diameter of the thread

screw; d - internal thread diameter

screw; S - thickness of the gasket.

The drawing shows the assembly of the proposed compound.

Two metal parts 1 and 2 are connected with a screw with a half-sealed or countersunk head 3 and a nut 4. Between parts 1 and 2 there is a gasket 5 made of flexible and elastic dielectric material, for example, PVC. One half of the gasket is installed between the insulated children 1 and 2, and the second through the edge of the part 1 is wrapped on the surface of the latter between it and the head and part of the screw stem. The screw hole in the part 1 is made with a diameter equal to d (1.5-1.8) 5, and the coaxial holes in the insulating gasket are made with a diameter equal to D - (OD-0,)

where d is the nominal diameter of the thread

screw;

d internal thread diameter 1

screw;

S gasket thickness. The hole in the part 1 razzenkovano at an angle and to a depth equal to the angle and height of the secret head 3 screws.

Execution in the gasket 5 holes with a diameter of 0.2-0.3 smaller inner diameter d, the screw thread, provides for insertion through the top hole in the screw gasket in the cross section of the holes of parts 1 and 2 pressing the strip to countersink walls and holes in the part 1. Only after inserting the gasket with the end of the screw into the hole of the part 1, the hole in the gasket will be stretched and the screwed screw will go further into the hole in the part 2 ..

Making a hole in the part 1 with a diameter of 0.2-0.5 smaller than d + 2 S provides for a dense filling of the gap between the screw and the hole in the part 1 with the gasket material and thereby provides electrical insulation for them.

When the screw is further screwed into the coaxial holes previously made in the gasket and tightened with a nut 4, the gasket 5 with the screw head 3 is pressed against the countersink surface in part 1, ensuring reliable electrical insulation of the countersink screw. This way electrical insulation of parts will be provided.

1 and 2. Wrapping the edge and the surface of the part 1 in the place of its connection with part 2, in addition, prevents them from closing when in contact with random metal objects,

Claims (1)

1. The patent of France No. 2218784, cl. F 16 B 43/00, 1974. 2, - Ship Mechanic Handbook, L., 1975, vol. 3, p. 163, fig. 6.14 (prototype).