CN203670410U

CN203670410U - Tensile nut

Info

Publication number: CN203670410U
Application number: CN201320765776.3U
Authority: CN
Inventors: 宋新潮; 张振平; 杨树学; 千力
Original assignee: SHAANXI DONGFANG AVIATION INSTRUMENT Co Ltd
Current assignee: SHAANXI DONGFANG AVIATION INSTRUMENT Co Ltd
Priority date: 2013-11-19
Filing date: 2013-11-19
Publication date: 2014-06-25
Anticipated expiration: 2023-11-19

Abstract

The utility model discloses a tensile nut which consists of a cylindrical inner nut sleeve, a cylindrical outer nut sleeve and a spline tooth gasket. The inner wall of the inner nut sleeve is provided with first inner threads going through two ends of the inner nut sleeve, the first inner threads are identical to threads of a matched bolt in parameter, the outer wall of the inner nut sleeve is provided with outer threads, the outer wall at the lower end of the outer threads is provided with first outer spline teeth. The inner wall of the outer nut sleeve is provided with second inner threads, rectangular spline teeth separated at intervals are arranged at the upper end of the outer nut sleeve, and the outer nut sleeve is screwed with the inner nut sleeve. An inner circle and an outer circle of the spline tooth gasket are provided with spline teeth, the spline teeth on the inner circle are matched with the first outer spline teeth, and the spline tooth gasket sleeves the first outer spline teeth of the inner nut sleeve. The biasing force produced by a power tool to the bolt when twisting force is exerted is overcome, and the loading torque accuracy can reach to +/-5%. The bolt and the nut are not easily damaged and can be repeatedly installed, dismounted and used.

Description

Stretching nut

Technical field

The utility model relates to a kind of nut, particularly a kind ofly only makes bolt bear the nut of axial tension tightening in supporting bolt process.

Background technique

Conventionally, realize being fastenedly connected of workpiece and need to use bolt, nut and pad, screwing nut by screwing tool with certain moment just can be fastening by workpiece.Excessive when the required moment that screws, as while exceeding 3000N.m, just need to complete this task with power tool or torque multiplier.In this situation, plain nut can embody following problem: make bolt strained complexity 1., in the fastening process of bolt, bolt not only will bear the axial tension of nut, also to bear the bias force producing when screwing tool applies torsion, generally bias force is all very high, and large bias force can have a strong impact on the precision of the suffered loading moment of torsion of bolt, causes bolt to be difficult to reach setting value to the fastening force of workpiece; 2. pair bolt and the damage of self are larger, and in the process of screwing, the thread of screw bolt and nut is in heavily loaded turn Frotteurism always, and larger plastic deformation can occur thread, and this will cause the damage of screw bolt and nut, even damages; 3. the tensile force of pair bolt is inconsistent, and the tensile force that same torque value produces bolt is inconsistent, causes the unbalance stress everywhere that connects workpiece.

Summary of the invention

The utility model proposes a kind of stretching nut, this nut can overcome the existing above-mentioned defect of plain nut.

The technological scheme that realizes above-mentioned purpose is: a kind of stretching nut, is made up of columnar inner nut cover, columnar outer nut cover and spline tooth packing ring; On the inwall of described inner nut cover, have the first internal thread that connects its two ends, the parameter of the first internal thread is identical with the thread parameter of supporting bolt, has outside thread on outer wall, and the outer wall of outside thread lower end is provided with the first external spline teeth; The inwall of described outer nut cover is provided with the second internal thread, and the upper end of outer nut cover is provided with the square key tooth of equi-spaced apart, and outer nut cover screws with inner nut thread die cutting; On the inner circle of described spline tooth packing ring and cylindrical, be equipped with spline tooth, the spline tooth in inner circle and described the first external spline teeth are suitable, and spline tooth gasket sleeve is contained in the first external spline teeth of inner nut cover.

Further, described outside thread and the second internal thread are T-shaped screw thread.

Brief description of the drawings

Fig. 1 is an embodiment's of the utility model axial sectional view.

Fig. 2 is the shaft side figure of the inner nut cover in embodiment illustrated in fig. 1.

Fig. 3 is the shaft side figure of the outer nut cover in embodiment illustrated in fig. 1.

Fig. 4 is the shaft side figure of the spline tooth packing ring in embodiment illustrated in fig. 1.

Fig. 5 is that the utility model is for bolted schematic diagram.

In figure: 1. inner nut cover, 101. first internal threads, 102. outside threads, 103. first external spline teeth, 2. outer nut cover, 201. second internal threads, 202. square key teeth, 3. spline tooth packing ring, 301. inner spline gears, 302. second external spline teeth, 4. bolt, 5. workpiece.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail.

As Figure 1-5, the utility model is made up of the inner nut cover 1 of tubular, outer nut cover 2 and the spline tooth packing ring 3 of tubular; On the inwall of inner nut cover 1, there is the first internal thread 101 that connects its two ends, the thread parameter of the first internal thread 101 is identical with the thread parameter of supporting bolt 4, on the outer wall of inner nut cover 1, have outside thread 102, the outer wall of outside thread 102 lower ends is provided with the first external spline teeth 103; The inwall of outer nut cover 2 is provided with that the second internal thread 201, the second internal threads 201 are suitable with outside thread 102, and the upper end of outer nut cover 2 is provided with the square key tooth 202 of equi-spaced apart, and outer nut cover 2 overlaps 1 screw thread with inner nut and screws; Spline tooth packing ring 3 is an annular plate-like part, and its inner circle is provided with inner spline gear 301, and cylindrical is provided with the second external spline teeth 302, and inner spline gear 301 and the first external spline teeth 103 are suitable, and spline tooth packing ring 3 is sleeved in the external spline teeth 103 of inner nut cover 1.

In the present embodiment, the second internal thread 201 on outside thread 102 and outer nut cover 2 is T-shaped screw thread.The advantage that outside thread 102 and the second internal thread 201 are all made as T-shaped screw thread is, can transmit very large axial force, and easily processing and transmission efficiency are high.

Below in conjunction with Fig. 5, use of the present utility model and technique effect are done to a description:

As shown in Figure 5, when the utility model is sleeved on bolt 4 and makes after spline tooth packing ring 3 conflicts on workpiece 5, use supporting power tool (hydraulic spanner or electric wrench) to screw this stretching nut, certainly, the clutch end head of power tool should be suitable with square key tooth 202, on the casing of power tool, should have the holding assembly suitable with the second external spline teeth 302, holding assembly can clamp spline tooth packing ring 3 tightly.At power tool, the loading of stretching nut is screwed in process; the clutch end of power tool acts on outer nut cover 2, screws outer nut cover 2, along with the rotation that screws of outer nut cover 2; inner nut cover 1 is raised gradually; thereby the bolt in it 4 is stretched gradually, when bolt 4 is stretched to setting value, when default load that bolt 4 and stretching nut bear; stop the action that screws of power tool; shut down, now, bolt 4 has accused the fastening task of workpiece 5.

At power tool, the loading of stretching nut is screwed in process, inner nut cover 1 does not rotate, just under the drive of nut sleeve 2, do axial displacement outside, meanwhile, screwing the axial tension that 4, bolt in inner nut cover 1 bears inner nut cover 1 and give it, because not there is not thread wear problem of turn friction, therefore in their thread, screw bolt and nut is not easily damaged, can repeated disassembled and assembled use.

The utility model has overcome the bias force that power tool produces bolt in the time applying torsion, can make to load torque precision up to ± 5%, makes the tensile force of diverse location bolt reach highly consistent, makes to connect the stressed even of workpiece everywhere.

Claims

1. a stretching nut, is characterized in that: be made up of columnar inner nut cover, columnar outer nut cover and spline tooth packing ring; On the inwall of described inner nut cover, have the first internal thread that connects its two ends, the parameter of the first internal thread is identical with the thread parameter of supporting bolt, has outside thread on outer wall, and the outer wall of outside thread lower end is provided with the first external spline teeth; The inwall of described outer nut cover is provided with the second internal thread, and the upper end of outer nut cover is provided with the square key tooth of equi-spaced apart, and outer nut cover screws with inner nut thread die cutting; On the inner circle of described spline tooth packing ring and cylindrical, be equipped with spline tooth, the spline tooth in inner circle and described the first external spline teeth are suitable, and spline tooth gasket sleeve is contained in the first external spline teeth of inner nut cover.

2. according to stretching nut claimed in claim 1, it is characterized in that: described outside thread and the second internal thread are T-shaped screw thread.