CN201610888U - Fastening piece - Google Patents

Abstract

The utility model relates to a fastening piece, which comprises a bolt pole and a bolt head, wherein a spherical surface is formed at the junction of the bolt pole and the bolt head. The utility model has reasonable design, extensive application range, fewer installation parts and small additional stress, and can improve the safety performance without the need for larger installation space and more fastening pieces.

Description

A kind of fastening piece

Technical field

The utility model relates to a kind of fastening piece, is specifically related to a kind of clamping bolt that is used for connection set.

Background technique

Existing plain bolt, the installation surface of contact is the plane.When carrying out fastening connection, produce additional torque because various machining errors make between the attachment face of bolt and the screw rod, thereby make the inner additional stress that produces of bolt.For reducing stress, generally use the way of spherical washer+taper faced washer to solve.The shortcoming of doing like this is: increased fastening parts; And spherical washer+taper faced washer structure takes up room bigger, and not only bolt is wanted corresponding lengthening, and bolt head protrudes attachment face and increase, and neither attractive in appearance, compact, installing space does not allow yet.

Summary of the invention

The purpose of this utility model is to overcome the existing shortcoming of said structure, provides a kind of and install that part is few, additional stress is little, connects the high fastening piece of Safety performance.

The utility model comprises bolt shank, bolt head, it is characterized in that: said bolt shank and bolt head connecting part are 60-70 ° sphere.

The utility model is reasonable in design, and using scope is wide, installs that part is few, additional stress is little, adds under the prerequisite of installing space and fastening piece quantity not increasing or reduce, and has improved the Safety performance of connection.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is embodiment 1 figure of the present utility model.

Fig. 3 is embodiment 2 figure of the present utility model.

Among the figure: 1, bolt shank, 2, bolt head, 3, sphere, 4, coupled, 5, nut; 6, taper washer.

Embodiment

From above-mentioned accompanying drawing 1 as can be seen, the utility model is made up of bolt shank 1 and bolt head 2, and bolt shank 1 and bolt head 2 connecting parts are one 60-70 ° sphere 3.

Fig. 2 is a specific embodiment of the present utility model.

Bolt shank 1 on the utility model fastening piece passes coupled 4, and 120 ° of chamferings are poured out in the end in the hole on coupled 4.The sphere 3 of fastening piece contacts with this chamfer surface, and when fastening nut 5, sphere 3 can slide with self-aligning on chamfer surface, thereby can not produce additional moment between bolt head 2 and bolt shank 1.The utility model has reduced a spherical washer and a taper washer than prior art, and it is few that part is installed, and saves cost.

Fig. 3 is another embodiment of the present utility model.

Add a taper washer 6 between fastening piece of the present utility model and coupled 4.Sphere 3 on the fastening piece contacts with chamfer surface on the taper washer 6, and when fastening nut 5, sphere 3 can slide with self-aligning on chamfer surface, thereby can not produce additional moment between bolt head 2 and bolt shank 1.

Claims (1)

1. a fastening piece comprises bolt shank (1), bolt head (2), it is characterized in that: said bolt shank (1) and bolt head (2) connecting part are 60-70 ° sphere (3).

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