SU1222916A1 - Threaded joint - Google Patents

Description

The invention relates to mechanical engineering.

The purpose of the invention is to expand the operational capabilities of the connection.

FIG. 1 shows a threaded connection, an obiHi type; in fig. 2 — Composite nut assembly, general view; in fig. 3 shows section A-A in FIG. 2; in fig. 4 shows a fragment of a threaded joint (end washers and nut housing are not shown); in fig. 5 - washer with a hole diameter corresponding to the inner diameter of the bolt thread, general view; in fig. b - view B in FIG. five; on .fig. 7 - washer with a hole diameter corresponding to the outer diameter of the bolt thread, general view; in fig. 8 is a view of B in FIG. 6; in fig. 9 - a washer with a hole diameter corresponding to the outer diameter of the bolt thread, option; in fig. 10 - the same, with the increased opening of a washer; in fig. 11 is a view of FIG. ten; in fig. 12 - a fragment of a nut screwed on a bolt with a triangular thread profile (end washers and nut housing are not shown); in fig. 13 - the same, with a trapezoidal thread profile under the action of the working load (the thread pitch of the nut is not equal to the bolt thread pitch); in fig. 14 - the same, the variant, when the washers forming the grooves of the thread profile of the nut are made of elastic non-metallic material (the thread pitch of the nut is not equal to the bolt thread pitch).

The threaded connection includes a bolt 1 and a composite nut 2 consisting of a housing 3, with a hole 4 for the bolt 1 to pass through the nut. The nut housing 3 contains a set of washers consisting of two continuous end washers 5 and a set of split washers curved in the plane of the washer along a helical line to the thread pitch of the bolt 1 and forming the thread profile of the composite nut 2, from which the washers 6 form protrusions and washers 7 form the grooves.

The washers 6 and 7 are placed in the housing 3 with mutual alternation so that in the set they form a sequential alternation of the protrusions and grooves of the rectangular nut thread profile. All washers are provided with holes, the diameter of 8 holes 9 of washers 7 forming the grooves of the nut thread profile exceeds the outer diameter of 10 threads of the bolt 1, and the diameter of 11 holes 12 of washers 6 is smaller than the outer diameter of 10 and larger than the internal diameter 13 of the bolt threads. The washers 7 and 6 are provided with a radial slit 14, cutting the plane of the washer from the outer face 15 to the edge 16 of the holes 9 and 12.

The washer 7 can be made in the form of a split ring 17 (FIG. 9), the outer diameter 18 of which is smaller than the diameter 19 of the circumference 20 inscribed in the polygonal washer 6 forming the protrusions of the nut thread profile. The inner diameter of 8 holes 9 in the washer 17 can be increased to the size, while the width of the ring washers 17

will not be equal to its thickness. Then, the pawl 17 will look like the pawl 21, which in this case is the most technologically advanced to make from wire.

When interacting protrusions profile

The 5 threads of the nut with the working surface of the thread 22 of the bolt 1, their contact occurs at points 23 located along the edge 16 of the holes 12 of the washers 6 forming the protrusions. If the washers 6 forming the protrusions of the nut threads are made of an elastic material capable of deforming under the action of the load, and after removing the load, take the initial initial position, then this shock absorber nut excludes the possibility of its spontaneous unscrewing.

FIG. 13 shows the moment of deformation of the protrusions 24 of the nut threads under the action of an axial load (the direction is indicated by arrows). In this case, the protrusions 24, deformed, bend relative to the inner edges 16 of the openings 9 of the washers 7, 17 and 21. If the bolt 1 is provided with a trapezoidal thread, then with the deformation of the projections 24 a more complete contact of the side (working) surfaces of the protrusions of the nut and the bolt is achieved. When the axial load is removed, the projections 24

return to the initial position close to the position of the protrusions in FIG. 12, due to the elasticity of the material.

If the composite nut is provided with washers 7 made of an elastic material, when screwing such a nut on the bolt 1, whose thread clamp differs from the nut pitch of the nut, not only are the turns of the nut (the protrusions 24 of the thread), but also the washers 25. At this ensures, within certain limits, a change in the thread pitch of the nut in the direction corresponding to the thread pitch of the bolt. This property allows such a nut to absolutely be screwed onto bolts that match the Q diameter, but have different profiles and thread pitch.

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Compiled by B. Banks

Ed. TupitsTehred I. VeresKorrektor A. Zimokosov

Order 1691/36 Circulation 777 Subscription

VNIIPI USSR State Office

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (3)

1. THREADED CONNECTION, containing a bolt and a compound nut, including a non-circular body in cross section, in which there are two end continuous washers and a set of washers that form a thread and located between the end washers, characterized in that, in order to expand the operational capabilities of the connection, threaded washers are made split with qi FIG. 1 with two hole diameters and arranged in pairs with alternating them, each of the split washers being bent along the helix by the size of the thread pitch, the diameter of the larger hole corresponds to the outer diameter of the thread of the bolt, and the diameter of the smaller hole to the internal diameter of the thread of the bolt. 2. Connection by π. 1, characterized in that, in order to reduce the metal consumption, the washers with holes of a larger diameter are made in the form of round rings with an outer diameter not exceeding the minimum size of the inner cross section of the housing. _Q 3. Connection PP. 1 and 2, characterized in that the washers are made of elastically deformable material.