Bolt with a shaped head

 

(57) Abstract:

The invention relates to mechanical engineering and can be used for automatic assembling threaded connections. 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. According to the invention, the side surface depressions shaped head is cylindrical, and the side surface of the protrusions has a cylindrical and conical sections, and the small diameter of the circumscribing circle on the conic section is 0.93 - 0.98 diameter of the circumscribed circle of the cylindrical part of lateral surface projections. The length of the conical section is 0.25 - 0.45 height-shaped head. In the result the task of creating a bolt with a shaped head with simplified design. Provides high torque to the mounting tool and precise mounting of the tool on the bolt head. 1 Il.

The invention relates to mechanical engineering and can be used in automatic Assembly threaded connection of the awn and shaped head 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 F 16 B 23/00, 1992).

This bolt is difficult to use in the automatic Assembly because its design does not provide for any centering elements on the depressions and protrusions shaped head: not provided centering and not excluded not accurate mounting of the tool on the bolt head.

The closest technical solution to the present invention is a bolt with a shaped head containing shaped head with outer engagement elements made in the form of alternating longitudinal ridges and troughs connected by radii, while the protrusions plots side of the outer surface is cylindrical and the surface between them is made conical (RF patent 2091617, CL F 16 B 23/00, 1997).

Known bolt has a centering properties ensures accurate installation of the tool on the bolt head, but has the following disadvantages.

1. Shaped head is difficult to manufacture the design.

2. Have tapered sections in the hollows of the elements of the mesh significantly reduces the contact area rests the possibility of tightening the bolt with high effort.

3. For mounting bolts require the use of special tools such as complex structures with the response profile.

The invention solves the problem of creating a bolt with a shaped head with simplified design for automated Assembly, does not require installation tools complex structures, transmitting high torque the mounting tool and provides centering, precision installation tool on the bolt head.

To achieve the technical result of the 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 side surface depressions shaped head is cylindrical, and the side surface of the protrusions has a cylindrical and conical sections. The small diameter of the circumscribing circle on the conic section is 0.93 -0,98 diameter of the circumscribing circle of the cylindrical part of lateral surface projections, the length of the conical section and is used for automatic Assembly tool. The contact surface area on the elements of the gearing shaped head bolt torque transmitting torque increases, and consequently, increases the strength of the head that allows you to generate high torques. In addition, it ensures centering and accurate mounting of the tool on the bolt head during automatic Assembly.

The invention is illustrated in the drawing, which shows the proposed bolt.

The bolt includes a threaded rod 1, the shaped head 2 and the flange 3. Shaped head has a cavity 4, the side surface of which is cylindrical, and the protrusions are conical section 5 from the side of the head and the cylindrical section 6. The small diameter of the circumcircle to the conical section Dto= (0,93 - 0,98)Dgwhere Dg- the diameter of the circumscribed circle of the cylindrical section on the projections. The length of the conical section 1 = (0,25 - 0,45)H, where H is the height of the shaped head.

The application of the proposed simple in construction bolt with a stronger shaped head allows you to provide centering, precision installation tool on the bolt head and to ensure reliable automatic Assembly.

the outer elements of the gearing under mounting tool made in the form of alternating longitudinal ridges and troughs connected by radii, wherein the side surface depressions shaped head is cylindrical, and the side surface of the protrusions has a cylindrical and conical sections, and the small diameter of the circumscribing circle on the conic section is 0.93 - 0.98 diameter of the circumscribed circle of the cylindrical part of lateral surface projections, the length of the conical section is 0.25 - 0.45 height-shaped head.

 

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