CN201679837U

CN201679837U - Anti-looseness external thread connector

Info

Publication number: CN201679837U
Application number: CN2010202100016U
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-looseness external thread connector, which includes a connector body, and outer threads formed on the connector body, wherein the dentoform of each outer thread is formed by three oblique surfaces, every two adjacent oblique surfaces of the three intersect in sequence, the crest angle of the outer threads is smaller than 60 degrees, and each outer thread has the same crest height as that of an ordinary 60-degree triangle thread; the three oblique surfaces include a first oblique surface, a second oblique surface and a third oblique surface, the intersecting part of the first oblique surface and the second oblique surface is the crest, the third oblique surface starts from the root, and the interesting part of the third oblique surface and the second oblique surface leaves from the thread axial lead father than the root; and the included angle of the first oblique surface and the thread axial lead is 60 degrees, the included angle of the third oblique surface and the thread axial lead ranges from 15 degrees to 45 degrees, and the included angle of the first oblique surface and the second oblique surface is smaller than 60 degrees, but larger than 40 degrees. According to the structure, the external thread connector has the advantages of simple structure, low cost, and anti-looseness effect under the condition of not changing the using method and not increasing additional auxiliaries.

Description

Anti-loosening outside thread link

Technical field

The utility model relates to a kind of outside 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 bolt, double-screw bolt with regular screw threads is provided with other and externally threadedly is connected the assembling that component are widely used in the engineering goods such as lathe, automobile, agricultural machinery and connects.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 outside thread link with novel tooth form is provided, and this outside thread link anti-loosing effect is good.

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

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, outside thread link provided by the utility model and internal thread screw when using, each cusp in its screwing length of internal thread presses closer outside uniformly, and the wedge shape inclined-plane of worm tooth bottom is on the 3rd inclined-plane, 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 connection diagram of the internal thread link with identical tooth form.

Embodiment

The utility model is that example describes with the bolt, and as shown in Figure 1, bolt 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 outside thread link provided by the utility model 2 and internal thread link 4 with regular screw threads screw fastening after, the crest of internal thread presses closer uniformly on the 3rd inclined-plane 23, the 3rd inclined-plane 23 is 30 ° with the angle of the shaft axis 3 of screw thread, if the axial force that the outside thread link is subjected to is F, so normal force Ft=2F.

As shown in Figure 3, have common externally threaded link 5 and internal thread link 4 with regular screw threads screw fastening after, establish the axial force that common externally threaded link 5 is subjected to and be 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 internal 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 bolt, is not to restriction of the present utility model, meets other shape outside thread link of tooth form described in the utility model, still in protection domain of the present utility model.

Claims

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

2. anti-loosening outside 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 outside 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 °.