CN202946504U

CN202946504U - Equal load bearing threaded connection device

Info

Publication number: CN202946504U
Application number: CN201220616894.3U
Authority: CN
Inventors: 孟兆明
Original assignee: Qingdao University of Science and Technology
Current assignee: Qingdao University of Science and Technology
Priority date: 2012-11-09
Filing date: 2012-11-09
Publication date: 2013-05-22
Anticipated expiration: 2022-11-09

Abstract

The utility model relates to an equal load bearing threaded connection device. The equal load bearing threaded connection device can improve the bearing capability of threads, and avoid the thread slipping damage of tensioned bolts, studs and the like caused by uneven stress of thread teeth and plastic deformation of the thread teeth in thread connection. At present, the prior art has no capability of thread teeth equal bearing or approximate equal bearing, and aiming at the technical defect of the prior art, the equal load bearing threaded connection device is provided. The equal load bearing threaded connection device comprises an equal bearing nut, a standard bolt and a workpiece to be connected. According to the equal bearing nut, the upper tooth profile of the nut is enlarged from a standard screw pitch P to a new screw pitch P* downward from the beginning of the top surface thread form of a standard nut along an axial direction, and the screw pitch P of the lower tooth profile of the nut is maintained the same. According to the technical scheme of the equal load bearing threaded connection device, the tensioned bolts, the studs and the like are enabled to achieve the thread teeth equal bearing or approximate equal bearing in the thread connection, and therefore the intensity of the thread connection is improved, thread slipping damage is avoided, and the requirements of being compact in structure and easy to process and manufacture are reached.

Description

A kind of equivalent-load screw connection

Technical field

The utility model relates to a kind of equivalent-load screw connection, specifically, relate to a kind of energy and improve the bearing capacity that is threaded, and can effectively prevent tension bolt, stud etc. in being threaded due to the stressed serious inequality of worm tooth, worm tooth produces plastic deformation and causes the screw thread stripped thread to destroy.

Background technique

Being threaded is a kind of connecting mode that extensively adopts in mechanical industry, is using in a large number at present the scyewed joint such as tension bolt, stud.Consider from the convenience of the mounting or dismounting that are threaded, the pitch of bolt, nut is identical usually, and the pitch up and down of internal and external threads tooth is also identical.Due to this screw thread geometrical relationship, make screw thread worm tooth distribution of force under the effect of power seriously uneven, the undermost worm tooth of nut is stressed large especially, and worm tooth can produce large plastic deformation and cause the worm tooth stripped thread to destroy herein.The technician has done many effort for this reason, taked measures such as Tension Nut, interior oblique nut, annular groove nut, but these corrective measures makes trouble, cost is high and effect is also bad.

The model utility content

Shortcomings and deficiencies for the existing technology that is threaded, the utility model provides a kind of equivalent-load screw connection, it can guarantee under low manufacturing cost prerequisite, realize worm tooth equivalent-load or approximate equivalent-load, be threaded intensity and avoid worm tooth stripped thread destruction thereby greatly improve.

A kind of equivalent-load screw connection of the utility model, it comprises equivalent-load nut, standard bolt and connected piece, it is the corresponding relation according to the worm tooth of tension bolt power and tooth form amount of deformation when the axial tension, tooth form upper side with standard nut, accurately cut one by one certain amount, make the pitch up and down of equivalent-load nut tooth form unequal, the lower pitch of tooth form is still standard pitch P, the upper pitch of tooth form changes new pitch P * into, and P*＞P.When the equivalent-load nut with standard bolt when zero load is connected, its surface of contact that is threaded forms the geometric gap that increases gradually from top to bottom, when bolt is being subject to guaranteeing under load, can successively contact with nut worm tooth from top to bottom along axial elongation after the bolt tension, make every layer of stressed equalization of worm tooth, thereby realize the equivalent-load purpose.For this reason, the equivalent-load nut must be installed by forward.

The beneficial effects of the utility model

1, realize screw thread equivalent-load or approximate equivalent-load, bearing capacity improves greatly;

2, can prevent the worm tooth plastic failure, effectively eliminate worm tooth stripped thread breakoff phenomenon;

3, compact structure, reliability is high, dynamic balancing is effective;

The bearing capacity that 4, can show intuitively nut;

But 5 standardization, seriation, generalization.

Description of drawings

Fig. 1 is tension bolt equivalent-load screw connection schematic diagram;

Fig. 2 is that equivalent-load is threaded in how much design sketchs of worm tooth when not being subjected to axial force;

Fig. 3 is the partial enlarged drawing that equivalent-load is threaded in how much design sketchs of worm tooth when not being subjected to axial force;

Fig. 4 is that equivalent-load is threaded in worm tooth design sketch when being subject to guaranteeing load;

Fig. 5 is the partial enlarged drawing that equivalent-load is threaded in worm tooth design sketch when being subject to guaranteeing load;

Fig. 6 is that equivalent-load nut pitch concerns schematic diagram;

In figure: 1. equivalent-load nut, 2. standard bolt, 3. connected piece.

Embodiment

Fig. 1 is tension bolt equivalent-load screw connection embodiment of the present utility model.

with reference to Fig. 1, at first standard bolt 2 is placed in connected piece 3, the side is indicated Arabic numerals, and (in figure, Arabic numerals F* is illustrated in this and guarantees that loading force does the used time, worm tooth can be realized equivalent-load) equivalent-load nut 1 forward connect in the face of connected piece 3, when the bolt thrust load is zero, how much design sketchs of the worm tooth of connection set such as Fig. 2, the local amplification effect of circled such as Fig. 3 in Fig. 2, when the bolt thrust load is the assurance load F* of bolt, worm tooth design sketch such as Fig. 4 of connection set, the local amplification effect of circled such as Fig. 5 in Fig. 4, Fig. 4, shown in Figure 5ly can realize the equivalent-load purpose that is threaded.

In above embodiment, with reference to Fig. 6, equivalent-load nut 1 is that the starting point at standard nut end face tooth form begins along axially the pitch P cutting of the upper tooth profile of nut being enlarged to new pitch P * downwards, and the lower tooth profile standard pitch P of standard nut remains unchanged.

Claims

1. equivalent-load screw connection, it comprises equivalent-load nut (1), standard bolt (2), connected piece (3), it is characterized in that: described equivalent-load nut (1) and standard bolt (2) are when zero load, and its screw thread surface of contact place has the gap that increases gradually from top to bottom.

2. screw connection as claimed in claim 1 is characterized in that: the pitch of equivalent-load nut (1) tooth form up and down is different, and the lower pitch of tooth form is the standard thread pitch P, and the upper pitch of tooth form is new pitch P *, and P*＞P.

3. screw connection as claimed in claim 1 or 2 is characterized in that: equivalent-load nut (1) is that the starting point at standard nut end face tooth form begins along axially downwards the new pitch P *'s of worm tooth upper side manufacturing.

4. screw connection as claimed in claim 1, is characterized in that: the necessary nut forward installation of equivalent-load nut (1).