JPS61218831A - Torsion resistance groove joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to the assembly and attachment of a tubular member to an engagement member, and more particularly to the assembly and attachment of a metal tube to an end fitting to form a torsion member. .

For example, in aircraft and aerospace vehicles, a torque or torsion member is formed by connecting the tip of a tubular member to a preformed end member, and the assembled torque is
That is, it is common practice to tighten a torsion member to an element, connect them, and transmit torque or torsion therebetween. The tubular member allows torque, or torsion, to be transmitted between the preformed end members and substantially reduces the overall weight of the assembly. This is of course extremely important for aircraft and aerospace vehicles.

In the past, various configurations have been used to connect the distal end of a tubular member to a preformed end member.

The surface of the preformed end member that engages the tube has teeth, sledges,
That is, a groove is provided, and the tube end is operated by sliding along the tooth, slay John, i.e. the groove,
That is, the tube end was crimped or compressed so that the groove cut into the inner tube wall. For such an arrangement to be effective, the engagement surface and the inner tube wall must be closely matched, requiring precise manufacturing tolerances. Additionally, the teeth, sledges or grooves that dig into the inner tube wall, and the tools that crimp or compress the tube to the end member, or stress points or areas of the tube, can become fatigued and stress failure can occur. Such damage is of course undesirable in an aircraft or aerospace vehicle.

U.S. Pat. No. 3,837,755 discloses a method for connecting the distal end of a tubular member to a fitting member provided with a circumferential groove of a specific width, depth, and sidewall shape. ) A tubular control member or bushing rod is shown and described. The tube end is slipped onto the groove and the tube is compressed into the groove. The control member or bushing rod of this patent is axially operated to displace the rivet fitting. When operated axially, according to this patent, the grooved seating has an axial failure strength almost three times the axial strength of a conventional rivet control rod.

In this invention, the bushing rod grooving and forming configuration of U.S. Pat. can exceed its own torsional buckling and failure strength. Furthermore, one groove is extended in the axial direction of the tube, the side wall of the groove is maintained at an angle within a preset range, the outer diameter of the end fitting part and the ratio of the number of grooves to the width of the groove are selected in advance, and the groove is It has been found that great advantages can be obtained by preselecting the depth of the groove relative to the width of the groove and making the axial length of the groove larger than the circumferential width of the groove. The drawings will be explained.

Referring to Figure 1 of the drawings, there is shown a tube (2) assembled to one end member (4) according to the invention, with the tube (2)
may be of standard wall thickness, for example 0.058
Aluminum tubes with wall thicknesses of inches (0,14732011) and tubes with wall thicknesses of 0.095 inches may be used. FIG. 1 shows the tube (2) before it is assembled to the other end member (6). In the illustrated embodiment,
The end members are identical to each other. However, the end members can have various shapes if desired.

The end member (4L (6)) of the illustrated embodiment has four grooves formed at equal intervals around the outer periphery of the end member, such as grooves (a) and (b) of the end member (4). , O→.

06), the groove extending axially along the end member (4). The open end of the tube (2) is slip-operated onto the male end of the end member () and is inserted into longitudinally spaced longitudinally spaced grooves α0), (b), 0→t (" )t
and compressed into the groove as described below. As best shown in FIG. 1, the male end of the end member is axially grooved at a location between the shoulders. Groove 0φ, Q2), (2).

Qa) extends axially between the shoulders (goods), and. In assembling the torque tube, the open end of the tube (2) is slipped over the shoulders H, H, and when the tube (2) is compressed, the open end of the tube (2) slips over the shoulders 04. The depth of the groove (in the 0 position when reseated on
), without thinning or weakening phenomena, and at the same time without buckling of such tube wall ends, the grooves 00), (ro ), 0→, (16).

As best shown in FIGS. 2 and 3, the tube (
After 2) is slipped onto the male end work and its shoulder (c), the end of the tube (2) above the groove αψ, (b)t He (16) is compressed; The material of the tube (2) has a groove α without large elongation, that is, thinning of the tube wall thickness.
It fits the contour of φ, (b), 0→, (16) and is accommodated in the groove. Groove α0), (b), (14) # (16
) The compression of the tube end to the contour is done by swaging, explosive molding, and rubber press molding IC! 1ylk m Iy) - 1 fortune telling with Rinmeitosu Toribyou. Tool marks on the tube wall should be avoided. Preferably, the tube end is compressed and the contouring of the tube wall into the groove in the end piece is done electromagnetically.

As shown in FIG. 3, the angle (A) of the groove is substantially not less than 50@ and substantially not greater than 60', and the width of the groove is Depth of the groove C, measured vertically at the edge of the groove, not less than substantially 0.15 inch (0,3813) and not greater than substantially 0.45 inch (1,143 cfl)
should be no less than 0.02 inches (0,0508 cm) and substantially no greater than 0.10 inches (0,2541). front and rear ends of the groove (E);
and CF) should have a radius between about 0.01 and about 0.15 in+ (0.0254 and 0.381 C11). Groove side and end wall angles of 41.4±0.5°, groove width of 0.298 to 0.302 inches (0.75692 to 0.76708 cm);
0.034±0.002 inch (0.08636±0.
00508α) groove depth and 0.020 NO, 30
Experiments have determined that a radius of 1.5 inches (0.0508 - 0.762 cm) is a satisfactory torque or preferred configuration for torsion tubes for many aircraft and aerospace vehicles.

In carrying out this invention, the ratio of the outer diameter of the groove and the end member, that is, the fitting part, to the width of the groove, the ratio of the depth of the groove to the width of the groove, and the ratio of the length of the groove to the width of the groove are important. It is. The number of grooves divided by the outer diameter of the end member or mating portion should be equal to or less than 2.1 divided by the width of the groove, and the position shown in Figure 3. The value obtained by dividing the depth of the groove measured at (C) by the width of the groove measured at position CB) in Figure 3 is 2. 'O, and the length of the groove should be greater than the width of the groove.

In addition to high torque strength, the electromagnetically assembled torque or torsion tubes of the present invention are assembled at lower cost than conventional crimping techniques. Furthermore, a high conformability of the tube to the groove is obtained, resulting in excellent static and fatigue properties of the joint. The assembly of tubes and tube ends is not affected by the skill level of the operator. Furthermore, the manufacturing tolerances between the end seams, i.e. the tube inner and outer diameters of the parts, are less important and the size of the tube ends adapted to the end seams can be reduced, further reducing costs. I can do it.

The terms and expressions used herein are used as terms of description only and are not intended to be limiting and may be used to describe equivalents or portions of the features illustrated and described herein. It is clear that this is not intended to be exclusive, and that various modifications are possible within the scope of the claims.

[Brief explanation of the drawing]

Fig. 1 shows the torque of this invention, that is, a partially broken side view of the torsion tube, Fig. 2 is a cross-sectional view taken along the line 2-2 in Fig. 1, and Fig. 3 is an enlarged view of the circled part in Fig. 2. Figures 3a and 3b are enlarged views similar to Figure 3 showing the bottom surfaces of the grooves curving outwardly and inwardly, respectively. (2) --- One pipe (4)? (6) - One end member θ tun (b), (b), 0 groan - one groove ■ - - - Part of the end is arrogant, Q time... - Part of the patent applicant: Geraman Aerospace Corporation Ken Arin Jiji One outsider engraves the drawings (no changes in content> am Front G side F"lG, 1 Procedural amendment April 26, 1985)

Claims (12)

[Claims] (1) A torque tube assembly in which the torsional strength of the tip connecting portion exceeds the torsional strength of the tube, the torque tube assembly comprising a pair of end members connected by a tubular member, each of the end members being inside the tubular member. each male member has a plurality of axial grooves spaced equidistantly apart circumferentially around the male member, and shoulders at both axial ends of the grooves. an inner wall of the tubular member rests on the shoulder, an end of the tubular member intermediate the shoulder is received within the groove to form a torque transmitting connection therebetween; The directional groove is comprised of a plurality of straight side walls and a bottom surface that intersects with the side walls, each of the side walls having an equal angle to a vertically extending plane that is perpendicular to a horizontally extending plane passing through the intersection of the side walls and the outer surface of the end member. and wherein the intersections of the outer surface and the bottom surface with the side walls each have a constant radius. (2) The torque tube assembly according to claim 1, wherein the axial length of the groove between the shoulders is greater than the circumferential width of the groove. (3) The number of grooves in the end member divided by the outer diameter of the end member is equal to or smaller than 2.1 divided by the width of the groove. The torque tube assembly according to item (2). (4) The depth of the groove, measured substantially vertically at the edge of the groove, divided by the width of the groove, measured at the bottom of the groove, is equal to or less than 2. The torque tube assembly according to range (3). (5) The number of grooves in the end member divided by the outer diameter of the end member is equal to or smaller than 2.1 divided by the width of the groove. The torque tube assembly according to item (1). (6) the depth of said groove, measured substantially vertically at the edge of said groove, divided by the width of said groove, measured at the bottom of said groove, is equal to or less than 2; A torque tube assembly according to claim (1). (7) The inclination angle of the side wall of each groove is not substantially less than 5° and not substantially greater than 60°, the side wall is inclined in a direction away from the bottom surface of the recess, and the wall thickness of the tubular member is The torque tube assembly according to claim 1, wherein the angle of inclination of the side wall of the groove is selected according to the following. (8) The width of said groove is substantially 0.45 inches (1.143 inches).
cm).
The torque tube assembly according to item 1). (9) the depth of said groove, measured vertically at the edge of said groove, is not less than substantially 0.02 inch (0.0508 cm) and substantially 0.10 inch (0.254 cm);
A torque tube assembly according to claim 1, wherein the torque tube assembly is not larger than . (10) The intersection of the outer surface, the bottom surface, and the side wall is 0.
01 inch (0.0254cm) and 0.15 inch (
Claim No. (0.381 cm) having a radius between
The torque tube assembly according to item 1) or item (2). (11) The width of the groove is substantially 0.15 inches (0.38
4. The torque tube assembly of claim 4, wherein the torque tube assembly is not less than 1 cm) and substantially not greater than 0.45 inches (1.143 cm). (12) The depth of said groove, measured vertically at the edge of said groove, is not less than substantially 0.02 inch (0.0508 cm) and substantially 0.10 inch (0.254 cm).
).) The torque tube assembly of claim 11, wherein the torque tube assembly is