CN210003643U - blind hole connection self-locking screw for airplane - Google Patents

Abstract

The utility model relates to an blind hole connection self-locking screw for aircraft, its characterized in that includes screw rod (1), expansion link (2), has annular boss in screw rod (1) cavity and the cavity, and expansion link (2) shrinkage assembly is in screw rod (1) cavity, when screwing up the blind hole and connecting self-locking screw, expansion link extrusion screw cavity makes the screw rod external diameter increase, and it reaches the effect of friction auto-lock to increase the extrusion force between the screw binding face, the utility model discloses an extrusion force between expansion link extrusion screw rod increase screw and the assembly body realizes the friction auto-lock.

Description

blind hole connection self-locking screw for airplane

Technical Field

The utility model relates to an aircraft blind hole connecting screw, especially kinds of screws that can auto-lock.

Background

A large number of parts such as equipment components and parts, bond wires and the like on an airplane are usually directly installed on a machine body structure, and are usually connected by screws at positions where through holes cannot be installed, but the existing anti-loosening method for blind hole connection usually adopts spring washers, and the spring washers mainly have the defects of easy hydrogen embrittlement fracture and poor anti-loosening effect.

Disclosure of Invention

Not enough to current blind hole connection screw locking effect, the to-be-solved technical problem of the utility model is to provide kinds of screws that can utilize the friction auto-lock principle to reach locking purpose.

In order to solve the technical problem, the utility model discloses a technical scheme is kind of self-locking screw is connected to blind hole for aircraft, it includes screw rod 1, expansion link 2, screw rod 1 cavity and cavity 3 are interior to have annular boss, 2 shrinkage assemblies of expansion link are in cavity 3, expansion link 2 end processing has annular boss, when screwing up the blind hole and connecting self-locking screw, expansion link 2 can remove in cavity 3, through the annular boss of screw rod 1 and the squeezing action of 2 annular bosses of expansion link, increase screw rod 1 external diameter, screw rod 1 external screw thread is interior four arriss body self-locking screw thread.

Compared with the prior art, the beneficial effects of the utility model reside in that: the anti-loosening effect of the self-locking thread expansion rod 2 is more reliable than that of a common screw and a spring washer.

Drawings

The invention is further illustrated in the following figures and examples,

fig. 1 is a schematic view of kinds of blind hole connection self-locking screws for airplanes according to the present invention.

Fig. 2 is a sectional view a-a of fig. 1.

Fig. 3 is detail I of fig. 2.

In the figure, 1 is a screw 1, 2 is an expansion rod 2, and 3 is a cavity.

Detailed Description

The following describes the present invention in further steps with reference to the drawings.

Referring to fig. 1, 2 and 3, the self-locking screws for blind hole connection of airplanes of the present invention include a screw rod 1 and an expansion rod 2, wherein the screw rod 1 is hollow and has an annular boss in a cavity 3, the external thread of the screw rod 1 is an inner quadrangular self-locking thread, the expansion rod 2 is shrink-fitted in the cavity 3, and the end of the expansion rod 2 is processed with an annular boss.

When self-locking screw is screwed into the aircraft structure as in blind hole connection of fig. 2, the aircraft structure extrudes the cavity boss from the expansion rod 2 to the cavity 3, through the extrusion effect of the expansion rod 2 boss and the cavity 3 boss, the diameter of the screw rod 1 at the 3 boss of the cavity is increased, so that the extrusion force of the screw rod 1 external thread between the internal threads of the aircraft structure is increased, the screw rod 1 external thread is a friction self-locking thread, the extrusion force between the threads is increased, the friction self-locking effect is better, and the loosening and falling of the self-locking screw in blind hole connection.

The above disclosure is only for the preferred embodiment of the present invention, and certainly should not be construed as limiting the scope of the invention, which is defined by the appended claims.

Claims (4)

1. The blind hole connection self-locking screw for the airplanes is 1, and is characterized by comprising a screw rod (1) and an expansion rod (2), wherein the screw rod (1) is hollow, an annular boss is arranged in a hollow cavity (3) of the screw rod (1), and the expansion rod (2) is assembled in the cavity (3) in a shrinkage mode.
2. 2. The blind hole connection self-locking screw according to claim 1 is characterized in that an annular boss is processed at the end of the expansion rod (2) .
3. 3. The blind hole connection self-locking screw according to claim 1, characterized in that: when the blind hole is screwed up and the self-locking screw is connected, the expansion rod (2) can move in the cavity (3), and the outer diameter of the screw rod (1) is increased through the extrusion of the annular boss of the screw rod (1) and the annular boss of the expansion rod (2).
4. 4. The blind hole connection self-locking screw according to claim 1, characterized in that: the external thread of the screw rod (1) is an internal quadrangular self-locking thread.

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