Flange bolt with a shaped head

 

(57) Abstract:

The invention relates to mechanical engineering and can be used for automatic assembling threaded connections. Flange bolt with a shaped head includes a threaded rod, flange support surface and the shaped cylinder with outer elements of the gearing under mounting tool, made in the form of alternating longitudinal ridges and troughs, paired along the radii. Bearing surface of the flange disc made with an angle not less than 0o20' and no more than 2o. The height h of the flange is determined by the ratio

< / BR>
where dwiththe diameter of the shank of the bolt on a loaded section with the smallest cross-section, Dg- the outer diameter of the head on the ledges, Df- diameter flange, the angle of inclination of the support surface, dpthe diameter of podgotovka. Flange bolt with a shaped head has a low weight and high strength in the axial direction, ensures high stability of torque and has a locking properties. 1 Il.

The invention relates to mechanical engineering and can be used for automatic assembling threaded connections.

The well-known hexagonal bolt with a reduced RA the product. - M.: Mechanical Engineering, 1991. - S. 11).

The use of reduced size under the key characteristic of compounds with low torque preliminary tightening of the bolt; the reduced height of the bolt head for connections, working in cross-section.

Such bolts are not suitable for use in compounds of the perceiver in the operation of high axial loads for the following reasons: firstly, hex head with a reduced size key does not provide the transmission of high torques required for creating the effort required pre-tightening; secondly, on the basis of practical experience and experimental data it is established that at low altitude head is cut along the cylindrical surface of a diameter equal to the diameter of the shank of the bolt. So the hex bolts height less than 0.6 of the diameter of the rod for these purposes is not used (Birger I. A., Iosilevich, B. Threaded and flanged connections. - M.: Mashinostroenie, 1990. - S. 162).

For connections, receptive when operating high axial loads, use high strength bolts with hexagonal heads, having dimensions turnkey normal range in back of plushies.

Known bolt containing shaped head with outer engagement elements made in the form of alternating longitudinal ridges and troughs connected by radii (RF patent 2091617, CL F 16 B 23/00, 1997).

Known bolt has a reduced weight due shaped head design, but is not intended for connection perceiving high axial loads.

The closest technical solution to offer the flanged bolt with a shaped head containing a threaded rod, flange support surface and the shaped cylinder with outer elements of the gearing under mounting tool, made in the form of alternating longitudinal ridges and troughs connected by radii (U.S. patent 5137407, CL MKI F 16 B 23/00, NCI 411/404, 1992).

This bolt may be used in connection perceiving high axial loads. He has shaped head with reduced weight and a flange support surface, but has some drawbacks.

1. The performance of the support surface of the flange flat leads to uneven distribution of the contact pressure and increases the stress concentration under the head, resulting in to ensure the required prochnost. Since the axial strength of this shaped head with flange depends on the height of the flange and known technical solution does not determine the height of the flange, the practical application of this bolt is difficult because there is a need to conduct a large amount of experimental work to determine the lowest height of the flange retaining high axial strength shaped head with flange for each particular size of bolt.

3. The bolt has a locking properties.

The invention solves the problem of creating a flanged bolt with a shaped head, with low weight and high strength in the axial direction; providing a high stability torque and having a locking properties.

To achieve the technical result at flange bolt with a shaped head containing a threaded rod, flange support surface and the shaped cylinder with outer elements of the gearing under mounting tool, made in the form of alternating longitudinal ridges and troughs connected by radii, according to the invention, the base surface of the flange disc made with an angle not less than 0o
Dg- outer diameter of the head tabs;

Df- diameter flange;

- the angle of the supporting surface;

dpthe diameter of podgotovka.

When the height of the flange of the presence of an angle on the support side allows you to ensure that when tightening the uniform distribution of the contact pressure on the supporting surface and to reduce the stress concentration under the head. The angle is selected structurally from the specified interval established by experiment.

Thanks to optimum height of the flange is achieved by reducing the weight of the bolt without decreasing its strength. The greatest height of the flange is set on the basis of the process conditions.

When this flange is playing the role of the elastic element, which increases the stability of the torque, and also has a locking properties against self-unscrewing.

Thus, performing a head shaped design that makes it possible to reduce the weight in comparison with the heads of other species, in conjunction with the minimum allowable height of the flange enables the manufacture of a bolt with significantly improved performance and capabilities of its use.

The invention is illustrated in the drawing, where pok head has a cavity 4 and projections 5, coupled between the radii. Bearing surface of the flange disc made with an angle of not less than 0o20' and no more than 2oand the smaller the angle value corresponds to a greater value of the selected diameter of the flange 3. Last performed by the height h, which relates the ratio of outer diameter Dgthe bolt head on the projections, the diameter dwithstud bolt on the loaded section with the smallest cross-section, the diameter of podgotovka dpdiameter of flange Dfthat angle on the end .

Using the proposed design of the bolt reduces its weight by optimizing the height of the flange while maintaining high strength, improve the quality of automatic Assembly due to the stability of tightening threaded connections, to prevent self-unfastening and, consequently, ensures reliable operation of the entire work site.

Flange bolt with a shaped head containing a threaded rod, flange support surface and the shaped cylinder with outer elements of the gearing under mounting tool, made in the form of alternating longitudinal ridges and troughs connected by radii, characterized in that the bearing surface of the flange is made Terelj the>/BR>where dcthe diameter of the shank of the bolt on a loaded section with the smallest cross-section;

Dg- outer diameter of the head tabs;

Df- diameter flange;

- the angle of the supporting surface;

dpthe diameter of podgotovka.

 

Same patents:

Screw-clamp // 2159366
The invention relates to the field of engineering, for the objects used in the connectors locking or fixing devices

Screw-clamp // 2159366
The invention relates to the field of engineering, for the objects used in the connectors locking or fixing devices

The invention relates to mechanical engineering and can be used for locking connections, working in conditions of strong and long-term vibration

Bolt // 2057255
The invention relates to mechanical engineering and can be used in connection running under cyclic loads

Bolt // 2019734
The invention relates to elements for detachable joints used for threaded connections, for example, machine parts in mechanical engineering, shipbuilding, ship repair, etc

Screw-clamp // 2159366
The invention relates to the field of engineering, for the objects used in the connectors locking or fixing devices

Screw-clamp // 2159366
The invention relates to the field of engineering, for the objects used in the connectors locking or fixing devices

Screw-clamp // 2159366
The invention relates to the field of engineering, for the objects used in the connectors locking or fixing devices

Screw-clamp // 2159366
The invention relates to the field of engineering, for the objects used in the connectors locking or fixing devices

Screw-clamp // 2159366
The invention relates to the field of engineering, for the objects used in the connectors locking or fixing devices

The invention relates to a method and apparatus for stretching and strain relief with studs installed in the object, for example, in the flange or similar

The invention relates to mechanical engineering and can be used for locking connections, working in conditions of strong and long-term vibration

The invention relates to connecting elements and can be used for joining pipes in the manufacture of supporting devices, such as various handrails

Stud layered // 2143614
The invention relates to the fields of production fasteners, can be used in construction, machine-building and other structures

Bolt layered // 2143613
The invention relates to the production of fasteners, can be used in construction, machine-building and other structures

Stud // 2143612
The invention relates to the fields of production fasteners

The invention relates to the structures of the heads of the threaded fasteners and production tool

The invention relates to the mounting elements and the means to install them

The invention relates to the field of engineering, namely, screws with cutting head and the tools to tighten

Fastener // 2057254
The invention relates to fastening detail and can be used for connection of machine parts in cases where you want to impede unauthorized unscrewing or screwing in fasteners
Up!