CN201221530Y

CN201221530Y - Square head-shaped local screw thread hollow bolt with pad structure

Info

Publication number: CN201221530Y
Application number: CN 200820121212
Authority: CN
Inventors: 陆颂荫
Original assignee: Ningbo Donggang Fastener Manufacturing Co Ltd
Current assignee: Ningbo Donggang Fastener Manufacturing Co Ltd
Priority date: 2008-07-10
Filing date: 2008-07-10
Publication date: 2009-04-15
Anticipated expiration: 2018-07-10

Abstract

The utility model discloses a local thread hollow bolt with a square head and pad structure, comprising a bolt body. The bolt body comprises a rod body and a tail end body which are connected together with each other. The head end of the rod body is provided with a thread body with concave-convex tooth space in the radial direction, and the effective length of the thread body is at least equal to the diameter of the rod body. The axial center of the bolt body is provided with at least a seamless pipe shaped cavity formed through cold heading, and the cavity runs through the shaft end of the rod body and the tail end body. The axle center of the bolt body is provided with a round whole cavity. The weight of the entire bolt is reduced, and furthermore the weight of the relevant assembled elements is effectively reduced. The round hole cavity is arranged on the axle center of the bolt body, under the condition that the entire structure strength remains unchanged, the rigidity of the bolt can be effectively improved, and the internal stress of the bending section of the bolt is strengthened. The round hole cavity is arranged on the axle center of the bolt body, which can solve the problem that the permeability of the axle center heat treatment is poor, and improves the heat treatment effect of the bolt.

Description

Square toes band mat structure partial screw threads hollow bolt

Technical field

The utility model relates to the technical field of fastening piece in the five metals element, particularly a kind of square toes band mat structure partial screw threads hollow bolt.

Background technique

General bolt fastener traditionally mostly is the solid body structure, also use widely than tool, but the whole relatively weight of the bolt arrangement of solid body is bigger, and big weight directly can cause the raising of cost, is unfavorable for the saving of resource; Also have big weight also can bring the increase of being joined object weight; The solid body structure is when heat treatment, and the permeability in axle center is relatively poor.

But also having the bolt of half special-purpose hollow structure in the society, is Chinese utility model patent " the sleeve bolt " (notification number: CN2612832Y) this type of design is arranged of ZL03229829.3 as number of patent application; Profile is the beer ampuliform, and top is screwed screw rod, and the bottom is the hollow sleeve of hole enlargement, and the sleeve circumference has 3-5 groove that is used to weld along the sleeve generatrix direction.The special bolt in special use occasion is mainly considered in this design, does not have and the general function of present society's circulation bolt, so do not have the possibility of batch process; And this structure only relates to the part hollow structure, and hollow design is not carried out in the double thread attachment portion yet, so use on the performance of section the structure with present solid bolt identical at screw thread, do not have bigger difference.

Summary of the invention

Technical problem to be solved in the utility model is the present situation at prior art, provide a kind of rational in infrastructure, in light weight, rigidity is effective, the crimped section internal stress reaches the good square toes band mat structure partial screw threads hollow bolt of thermal effectiveness by force.

The utility model solves the problems of the technologies described above the technological scheme that is adopted: square toes band mat structure partial screw threads hollow bolt, comprise bolt body, this bolt body has the bar portion body and the tail end body of disjunctor, bar portion body head end radially is shaped on the threaded body of shaggy tooth groove shape, and the effective length of this threaded body equals the diameter value of bar portion body at least; The bolt body axial centre is shaped at least one seamless tubular shaped die cavity body through cold upset forming, and this die cavity body runs through the axle head of bar portion body and tail end body.

The measure of taking also comprises:

Above-mentioned bolt body is the structure of square toes band pulvilliform shape, and the tail end body that this structure is shaped on is cubic body, and the front end of this tail end body is a bar portion body; The die cavity body that structure is shaped on is a circular hole body, and this circular hole body is positioned at the shaft core position of above-mentioned bar portion body.

Be shaped on abducent first clout body between above-mentioned bar portion body and the tail end body, this first clout body inner surface is shaped on the first regularly arranged buckle teeth; The threaded body length that above-mentioned bar portion system has is at least half length of this bar portion body.

Compared with prior art, the utility model comprises bolt body, this bolt body has the bar portion body and the tail end body of disjunctor, and bar portion body head end radially is shaped on the threaded body of shaggy tooth groove shape, and the effective length of this threaded body equals the diameter value of bar portion body at least; The bolt body axial centre is shaped at least one seamless tubular shaped die cavity body through cold upset forming, and this die cavity body runs through the axle head of bar portion body and tail end body.Advantage of the present utility model is: at bolt body axle center preparation circular hole cavity, and whole bolt weight saving, and then reduced the weight that relevant institute is equipped with object effectively; At bolt body axle center preparation circular hole cavity, under the situation that overall construction intensity remains unchanged, improve the rigidity of bolt part effectively, strengthened the crimped section internal stress of bolt part; At bolt body axle center preparation circular hole cavity, in weight saving, also realized the saving of whole resource; At bolt body axle center preparation circular hole cavity, solved the relatively poor problem of axle center heat treatment permeability, improved the thermal effectiveness of the body of bolt.

Description of drawings

Fig. 1 is a half worm structure schematic three dimensional views in the utility model embodiment's the square toes band pulvilliform bolt body;

Fig. 1 a is that the master of Fig. 1 looks schematic representation;

Fig. 1 b is that schematic representation is looked on the left side of Fig. 1;

Fig. 1 c is that schematic representation is looked on the right side of Fig. 1;

Fig. 1 d is the schematic top plan view of Fig. 1;

Fig. 1 e is the elevational schematic view of Fig. 1;

Fig. 1 f is the schematic rear view of Fig. 1;

Fig. 1 g is the transposition schematic three dimensional views of Fig. 1.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

The utility model embodiment, square toes band mat structure partial screw threads hollow bolt, comprise bolt body, this bolt body has the bar portion body and the tail end body of disjunctor, bar portion body head end radially is shaped on the threaded body of shaggy tooth groove shape, and the effective length of this threaded body equals the diameter value of bar portion body at least; The bolt body axial centre is shaped at least one seamless tubular shaped die cavity body through cold upset forming, and this die cavity body runs through the axle head of bar portion body and tail end body.

Present embodiment is achieved in that

The utility model embodiment shown in Fig. 1 to Fig. 1 g, bolt body is the structure 14 of square toes band pulvilliform shape, and the tail end body 14a that this structure 14 is shaped on is cubic body, and the front end of this tail end body 14a is the body 14c of bar portion; The die cavity body that structure 14 is shaped on is a circular hole body 14b, and this circular hole body 14b is positioned at the shaft core position of the body 14c of bar portion.

Be shaped on the abducent first clout body 14d between body 14c of bar portion and the tail end body 14a, the first clout body 14d inner surface is shaped on the first regularly arranged buckle teeth 14g; The threaded body 14e length that the body 14c of bar portion is shaped on is half length of the body 14c of this bar portion.The rotation direction of threaded body 14e becomes opposite setting with the rotation direction of the described first buckle teeth 14g; The axial end of tail end body 14a is shaped on chamfering rib 14f on the circular hole body 14b and.

Advantage of the present utility model is: at bolt body axle center preparation circular hole cavity, and whole bolt weight saving, and then reduced the weight that relevant institute is equipped with object effectively; At bolt body axle center preparation circular hole cavity, under the situation that overall construction intensity remains unchanged, improve the rigidity of bolt part effectively, strengthened the crimped section internal stress of bolt part; At bolt body axle center preparation circular hole cavity, in weight saving, also realized the saving of whole resource; At bolt body axle center preparation circular hole cavity, solved the relatively poor problem of axle center heat treatment permeability, improved the thermal effectiveness of the body of bolt.

Most preferred embodiment of the present utility model is illustrated, and various variations or the remodeling made by those of ordinary skills can not break away from scope of the present utility model.

Claims

1, square toes band mat structure partial screw threads hollow bolt, comprise bolt body, described bolt body has the bar portion body and the tail end body of disjunctor, and described bar portion body head end radially is shaped on the threaded body of shaggy tooth groove shape, and the effective length of this threaded body equals the diameter value of bar portion body at least; It is characterized in that: described bolt body axial centre is shaped at least one seamless tubular shaped die cavity body through cold upset forming, and this die cavity body runs through the axle head of bar portion body and tail end body.

2, square toes band mat structure partial screw threads hollow bolt according to claim 1, it is characterized in that: described bolt body is the structure (14) of square toes band pulvilliform shape, the tail end body (14a) that this structure (14) is shaped on is cubic body, and the front end of this tail end body (14a) is a bar portion body (14c); The die cavity body that described structure (14) is shaped on is a circular hole body (14b), and this circular hole body (14b) is positioned at the shaft core position of described bar portion's body (14c).

3, square toes band mat structure partial screw threads hollow bolt according to claim 2, it is characterized in that: be shaped on abducent first clout body (14d) between described bar portion's body (14c) and the tail end body (14a), described first clout body (14d) inner surface is shaped on regularly arranged first buckle teeth (14g); Threaded body (14e) length that described bar portion's body (14c) is shaped on is at least half length of this bar portion body (14c).