CN2672355Y

CN2672355Y - Full screwthread locking nut

Info

Publication number: CN2672355Y
Application number: CN 200420032459
Authority: CN
Inventors: 张永华; 胡军
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-01-08
Filing date: 2004-01-08
Publication date: 2005-01-19
Anticipated expiration: 2014-01-08

Abstract

A full screw thread locking nut of the utility model relates to a screw thread fastener used for the engineering machine. The full screw thread locking nut is provided with a nut body with an internal screw thread. An evagination cambered helical surface is arranged at the relative position of the outer end part of each ring of internal screw thread and external screw thread of the nut body. The helical surface whose original surface is a plane is improved into an evagination cambered helical surface. Which can prevent the external screw thread from sliding the helical surface when the major diameter of the external screw thread is at the lower admission. The reliability of the lock of the screw thread is enhanced. The full screw thread locking nut can replace the existing nut.

Description

The Full Thread FT locking nut

Technical field

The utility model relates to the threaded fastener that uses in a kind of engineering machinery.What be particularly related to is a kind of lock nut.

Background technique

Be widely used for being connected between various machine parts by having externally threaded screw rod with the bolt connection piece that the nut with the internal thread that matches with outside thread is formed.Because the internal and external screw thread of standard bolt assembly has certain interval in radial direction, thereby in dynamic load workplaces such as vibrations, nut loosening takes place easily.For overcoming this shortcoming, one of present way is to set up locking part, and the bottom at nut that discloses as ZL97244535.8 disclosed " the automatic loose proof nut " be made up of nut main body and spiral spring, ZL0024428.3 offers groove, is mounted with spring sheet " lock nut " or the like in groove; Another kind of way is to adopt to change its worm structure, on same bolt shank, be provided with the different screw thread of diameter and be respectively equipped with the right side, left hand thread as ZL98233737.X is disclosed, be equipped with disclosed " two different locking thread screw pair " that except that being provided with standard thread, also is provided with and fine thread that rotation direction opposite identical of " anti-easing bolt ", the ZL98220133.8 of the effect nut that adapts and lock nut or the like with the big footpath of standard thread.Their shortcoming one is the processing technology complexity, and cost is higher; The 2nd, its repeat performance is not good, much is that dismounting just must be changed locking accessory three, five times; Some can only use once, gives to use and brings very big inconvenience.

U. S. Patent (number of patent application 851759) disclosed " locking screw thread structure " besides, this locking screw thread structure be " male thread part and the fastener structures that female threaded part is formed; female threaded part have the shortening adjacent with major diameter thread root; this thread root that has shortened is determined a helical planes that extends between tail flank of thread and the guide thread face on the other side; this helical planes in its whole axial amplitude with screw axis be about 15 ° to 45; this angle is significantly less than the angle of male thread part flank of thread; under the state that is subjected to axial tensile force load, the male thread part flank of thread is tending towards shifting to this plane, this plane from the tail flank of thread towards the adjacent radial inclination of guide thread face, when fastener structures is subjected to axial tensile force load, the crown of external screw thread and this plane interlock, thereby prevent that threaded part from locking together with respect to the lateral displacement of axis and with threaded part ".With the bolt of this " locking screw thread structure " use condition at the scene, the helicoid that its surface is the plane in use, when the big footpath of screw rod is in tolerance, place, the big footpath of screw rod slips over the helicoid that this surface is the plane easily, cause externally threaded tooth side directly to contact with the tooth side of internal thread, (referring to Fig. 1 and Fig. 2), its locking effect is also not ideal.

The model utility content

The purpose of this utility model is the above-mentioned shortcoming that overcomes prior art, provides a kind of can twisting with outside thread close external diameter and radially touch more reliable Full Thread FT locking nut.

Realize the Full Thread FT locking nut of the utility model purpose, have a nut body that has internal thread, each circle internal thread of described nut body with externally threaded on relative position, outer end be provided with the arc helicoid of an evagination.When this Full Thread FT locking nut is threaded with the screw rod composition of regular screw threads, the Lower Half of the arc helicoid of the evagination of this locking nut and each of screw rod circle is externally threaded twists and closes external diameter and evenly all contact, thereby the radial clearance between the elimination internal and external threads, change are subjected to force direction, the normal stress of contacting point are increased, promptly increased and prevented the frictional force become flexible, reached the effect that improves anti-loose ability.The arc helicoid of evagination has stoped place, externally threaded big footpath to slip over this arc helicoid, thereby from axially and radially all having guaranteed lock state.

The utility model is the arc helicoid that the helicoid on plane is improved to evagination with original surface, and the issuable sliding motion that slips over helicoid when having stoped externally threaded big footpath to be in down tolerance has improved the reliability of thread lock.Alternative existing nut uses.

Provide embodiment below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is that the surface is the helicoid locking structure schematic representation on plane

Fig. 2 is the A portion enlarged view of Fig. 1

Fig. 3 is a structural representation of the present utility model

Fig. 4 is the B portion enlarged view of Fig. 3

Embodiment

Shown in Figure 1 is U. S. Patent disclosed " locking screw thread structure ", wherein, 1 is screw rod, and 2 is nut, 3 are about 15 ° helical planes to 45 with screw axis for extending between tail flank of thread and the guide thread face on the other side, and promptly the surface is the helicoid on plane.

Referring to Fig. 3～4, the formation of this Full Thread FT locking nut comprises a nut body 5 that has internal thread, goes up the arc helicoid 7 that relative position, outer end is provided with an evagination at each circle internal thread of nut body 5 with screw rod 6 (among the figure shown in the double dot dash line) externally threaded.Tightening externally threaded the twisting of each circle of Lower Half and screw rod of arc helicoid of evagination of back nut closes external diameter and evenly all contacts, make internal and external screw thread in radial direction existence very close to each other, fundamentally stopped the possibility that moves radially between screw rod and the nut; The arc helicoid of evagination has stoped place, externally threaded big footpath to slip over this arc helicoid, thereby from axially and radially all having guaranteed lock state.

Claims

1, Full Thread FT locking nut has a nut body that has internal thread, it is characterized in that each circle internal thread of described nut body with externally threaded on relative position, outer end be provided with the arc helicoid of an evagination.