CN201679838U

CN201679838U - Anti-loosening internal thread connecting piece

Info

Publication number: CN201679838U
Application number: CN2010202100181U
Authority: CN
Inventors: 庄众心; 贾广坤; 王博藩; 许平华
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-24
Filing date: 2010-05-24
Publication date: 2010-12-22
Anticipated expiration: 2020-05-24

Abstract

The utility model discloses an anti-loosening internal thread connecting piece which comprises a connecting piece body and an internal thread arranged on the connecting piece body, and the thread form of the internal thread is constructed by three inclined planes in sequential intersection manner, the thread top angle of the internal thread is less than 60 degrees, and the thread top height of the internal thread is the same with the thread top height of a common 60-degree triangle thread. The three inclined planes includes the first inclined plane, the second inclined plane and the third inclined plane, the intersection of the first and second inclined planes is the thread top, the third inclined plane is from the thread bottom, and the intersection of the third inclined plane and the second inclined plane is far away from the thread axis comparing with the thread bottom. The included angle of the first inclined plane and the thread axis is 60 degrees, the included angle of the third inclined plane and the thread axis is 15-45 degrees, and the included angle of the first inclined plane and the second inclined plane is less than 60 degrees and is more than or equal to 40 degrees. The internal thread connecting piece with the structure has simple structure, low cost, adopts the same use method in prior art and avoids additional fittings and can realize good anti-loosening effect.

Description

Anti-loosening internal thread link

Technical field

The utility model relates to a kind of internal thread and connects fastening piece.

Background technique

The tooth form angle is that the V thread screws of 60 degree are the most frequently used regular screw threads, and the nut, swivel nut with regular screw threads connects with the assembling that component are widely used in the engineering goods such as lathe, automobile, agricultural machinery that is connected that other is provided with common internal thread.Regular screw threads, often get loose under the condition of violent vibration voluntarily because of its intrinsic defective, cause connect the loosening of component, light then cause the afunction of machinery equipment, weight is what for to leading to security incident.The existing loosening method of threaded fastener that solves mainly contains following several: inlay nylon or elastic collet, install retaining pin, install the retaining cushion additional, gluing etc. on screw thread.Said method ubiquity anti-loosing effect is poor, the defective of manufacturing or assembly technology complexity, user cost height and reusability difference.

The model utility content

The purpose of this utility model is at above-mentioned technological deficiency, and a kind of internal thread link with novel tooth form is provided, and this internal thread link anti-loosing effect is good.

To achieve these goals, the utility model provides a kind of anti-loosening internal thread link of following structure, comprise the link body and be located at internal thread on the link body, its structural feature is: the tooth form of described internal thread is made of three inclined-planes that intersect successively, and the crest angle of internal thread is identical with the crest height of common 60 ° of V thread screws less than the crest height of 60 ° and internal thread.

Described three inclined-planes are respectively first inclined-plane, second inclined-plane and the 3rd inclined-plane, and the intersection on first inclined-plane and second inclined-plane is a crest, and the 3rd inclined-plane starts from the bottom of the tooth, the intersection on the 3rd inclined-plane and second inclined-plane than tooth at the bottom of further from the shaft axis of screw thread.

The angle of the shaft axis of described first inclined-plane and screw thread is 60 °, and the angle of the shaft axis of the 3rd inclined-plane and screw thread is 15-45 °, the crest angle that first inclined-plane and second inclined-plane intersect to constitute less than 60 °, more than or equal to 40 °.

By above-mentioned disclosed technological scheme as can be known, internal thread link provided by the utility model and outside thread screw when using, it is on the 3rd inclined-plane that externally threaded each cusp in its screwing length presses closer on the wedge shape inclined-plane of internal thread tooth bottom uniformly, thereby produce the normal force more much bigger than regular screw threads, the very big increase of normal force also nature increased frictional force between internal and external screw thread greatly, thereby can reach the purpose that prevents that connecting thread is loosening.

That advantage of the present utility model is is simple in structure, cost is low, does not change using method, does not increase additional attachments and just can reach locking purpose.

Description of drawings

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail:

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

Fig. 2 is a free-body diagram of the present utility model;

Fig. 3 is the free-body diagram of regular screw threads;

Fig. 4 is the utility model and the linkage structure schematic representation of the outside thread link with identical tooth form.

Embodiment

The utility model is that example describes with the nut, and as shown in Figure 1, nut body 1 is provided with outside thread 2, and the tooth form of outside thread 2 is made of three inclined-planes that intersect successively.Above-mentioned three inclined-planes are respectively first inclined-plane 21, second inclined-plane 22 and the 3rd inclined-plane 23, the intersection on first inclined-plane 21 and second inclined-plane 22 is a crest, the crest height is identical with the crest height of common 60 ° of V thread screws, the 3rd inclined-plane 23 starts from the bottom of the tooth, the intersection on the 3rd inclined-plane 23 and second inclined-plane 22 than tooth at the bottom of further from the shaft axis 3 of screw thread.First inclined-plane 21 is 60 ° with the angle of the shaft axis of screw thread; The 3rd inclined-plane 23 is 15-45 ° with the angle of the shaft axis of screw thread, and preferred angle is 30 °; The angle on first inclined-plane 21 and second inclined-plane 22 less than 60 °, more than or equal to 40 °, preferred 45-55 ° of angle.

As shown in Figure 2, its outside thread of internal thread link provided by the utility model 2 and outside thread link 4 with regular screw threads screw fastening after, externally threaded crest presses closer uniformly on the 3rd inclined-plane 23, if the 3rd inclined-plane 23 is 30 ° with the angle of the shaft axis 3 of screw thread, the axial force that the internal thread link is subjected to is F, so normal force Ft=2F.

As shown in Figure 3, the link 5 with common internal thread and outside thread link 4 with regular screw threads screw fastening after, suppose that the axial force that outside thread link 4 is subjected to is all F, so normal force Fn=1.15F.

Ft that is to say that near 1.74 times of Fn the normal force that the utility model produces is 1.74 times of regular screw threads, has bigger self-lock force, thereby can reach good anti-loosing effect.

Same reason, as shown in Figure 4, the utility model and outside thread link 6 with identical tooth form screw the back fastening after, the crest of internal thread and externally threaded crest all withstand on the 3rd inclined-plane 23 at the bottom of the other side's tooth, the self-lock force that produces is near 3.48 times of common internal and external screw thread connection, therefore, anti-loosing effect is better.

Present embodiment only is that example describes the utility model with the nut, is not to restriction of the present utility model, meets other shape internal thread link of tooth form described in the utility model, still in protection domain of the present utility model.

Claims

1. anti-loosening internal thread link, comprise link body (1) and be located at internal thread (2) on the link body (1), it is characterized in that: the tooth form of described internal thread (2) is made of three inclined-planes that intersect successively, and the crest angle of internal thread (2) is identical with the crest height of common 60 ° of V thread screws less than the crest height of 60 ° and internal thread (2).

2. anti-loosening internal thread link according to claim 1, it is characterized in that: described three inclined-planes are respectively first inclined-plane (21), second inclined-plane (22) and the 3rd inclined-plane (23), the intersection of first inclined-plane (21) and second inclined-plane (22) is a crest, the 3rd inclined-plane (23) starts from the bottom of the tooth, the intersection on the 3rd inclined-plane (23) and second inclined-plane (22) than tooth at the bottom of further from the shaft axis of screw thread.

3. anti-loosening internal thread link according to claim 2, it is characterized in that: described first inclined-plane (21) is 60 ° with the angle of the shaft axis of screw thread, the angle of the shaft axis of the 3rd inclined-plane (23) and screw thread is 15-45 °, first inclined-plane (21) and second inclined-plane (22) intersect the crest angle that constitutes less than 60 °, more than or equal to 40 °.