SU1330358A1 - Arrangement for locking threaded joint - Google Patents

Abstract

The invention relates to units and parts of machines, to devices for securing structural elements, in particular to devices for locking in the process of screwing or tightening with spring washers. The aim of the invention is to improve the reliability of locking under variable loads. The device contains a bolt, nut, spring washer and retaining ring. On the bearing surface of the nut, several cuts of the triangular profile were made, and one similar groove was made on the surface of the attachment part. At one of the ends of the washer facing the part to be joined, radial teeth are made. When tightening the nut, its teeth slide along the smooth end of the washer until its bent end fully engages with one of the grooves of the nut. At the same time, the other bent end of the washer is placed in the part neckline. The retaining ring, covering the washer, prevents its extension. The device is disassembled with a wedge tool inserted at the point of contact of the bent end of the washer with the cut-out of the nut. 2 Il. I (L 00 co 0 00 fie.2

Description

The invention relates to machine components and parts, to devices for locking in the process of tightening or tightening with spring washers.

The aim of the invention is to improve the reliability of locking under variable loads.

Figure 1 shows schematically the proposed device for tightening the nut, general view; 2 - the same, after tightening the nut.

The device (FIG.) Contains a bolt 1 mounted in the hole of the attachment part 2, on which a spring washer 3 with teeth is worn on the side of the attachment part and with bent ends covering its retaining ring 4 and nut 5. On the bearing surfaces of the nut several cuts of the triangular profile were made, and attached to the surface. Details - one cutout of the same shape and size. One of the bent ends of the spring of the washer 3 is placed in the recess of the attachment part, and the other end is located in one of the recesses of the nut.

The device works as follows.

When mounting the device, put the spring washer 3 on the bolt 1 so that its radial teeth are facing the part to be attached, then put the lock ring 4 on the washer, insert the bolt into the hole of the part, placing the bent end of the washer in its cutout which is screwed on and tightened on the nut 5 (figure 2). In this case, the nut 5 slides along the smooth surface of the washer until. With maximum tightening force, the other bent end of the washer will not fully enter into the clamping pattern with one of the nut cut-outs.

The teeth filled in on the washer prevent it from turning in relation to the cut-out in the attachment part during the tightening of the nut. For improved slip of the nut, refer to the 11. Washers facing the surface of the nut are lubricated with machine oil or grease. When tightening the nut, the washer expands in the radial direction and selects a gap between

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its outer surface and the inner surface of the retaining ring, which eliminates the extension of the washer under the action of variable torques in the plane of the joint of the parts.

The depth of the triangular cutouts in the bearing surfaces of the nut and the attachment part to prevent their cutting is based on the shear strength of the materials of the nut and part.

To ensure a tight contact of the bent end of the washer with the hypotenuse of the cut, the bend of the end of the washer facing the nut is made at an angle equal to or greater than the angle of inclination of the hypotenuse of the cut of the nut to the plane of the connector at a length equal to 1/3 the length of the outer circumference of the washer.

When the device is demounted, a wedge tool is inserted into the contact point of the bent end of the washer with the nut cutout, the end of the washer is bent until it is completely disengaged from the cutout, and the nut is unscrewed.

Claims (1)

Formula of the invention A device for locking a threaded joint comprising a threaded rod, an attachment part, a nut and a spring washer with radial teeth of a triangular profile on supporting surfaces, characterized in that, in order to increase the reliability of locking at variable loads, the washer is complete with bent ends, on the surface of the attached part there is a groove corresponding in shape and size to the teeth of the nut, with which the teeth and the bend end of the washer interact, and between the nut and the part to be attached is set oh a lock ring with a washer, the height of which is less than the height of the washer to the height of its teeth, while the hypotenuse of the nut cutouts is inclined to the bearing surface at an angle equal to the angle of deviation of the washer ends bent from it, and the radial clearance between the washer and the lock ring is equal to half the radial expansion of the washer at the maximum enhancing its tightness. Compiled by S.Nikulin Editor E.Sligan Tehred V.Kadar 3563/37 Circulation 738 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 FI.1 Proofreader V. But ha