Integral titanium alloy pull rod

Abstract

The utility model belongs to the field of aircraft rod system bearing structures, and particularly relates to an integral titanium alloy pull rod. Comprising a pull rod body and double-lug connectors arranged at the two ends of the pull rod body, and the pull rod body comprises an equal straight section and variable cross-section sections arranged at the two ends of the equal straight section; the outer surface of the equal straight section is provided with a first outer cylindrical surface, and the inner surface of the equal straight section is provided with a first inner cylindrical surface; the outer surface of the variable cross-section section is provided with a first outer conical surface and a second outer cylindrical surface, the first outer conical surface is connected with the first outer cylindrical surface, and the inner surface of the variable cross-section section is provided with a continuous curved surface. According to the integral type titanium alloy pull rod, through the variable cross-section design, the cross-section shape is transited from the double-lug cross section to the middle circular hollow equal-straight-section structure, stress concentration in a combined type pull rod is avoided, the fatigue performance is good, and the weight is low.

Description

Technical Field

[0001] The present application belongs to the field of aircraft rod bearing structures, and in particular relates to an integral titanium alloy tie rod. Background Art

[0002] The tie rod structure is one of the commonly used structural forms of aircraft, which has the characteristics of direct and clear load transmission. Common tie rod forms include combined type and welded type.

[0003] Combined tie rods usually include tie rod joints and rod bodies. Tie rod joints and rod bodies are connected by threads or bolts. Tie rod joints are solid structures and are heavy. For threaded tie rods, the thread form and specifications affect the strength and fatigue performance of the tie rods. For bolted tie rods, the bolts need to pass through the tie rod joint body and the rod body, which weakens the tie rod joint and the rod body to a certain extent. At the same time, there is stress concentration around the bolt hole, which affects the strength and fatigue performance of the tie rod.

[0004] The welding type uses welding technology to connect the tie rod joint and the rod body into a whole. This type of tie rod will produce certain internal stress at the weld, which will cause the static strength and fatigue performance of the tie rod to decrease. In order to achieve a certain load-bearing capacity and fatigue performance, a certain weight cost needs to be paid.

[0005] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Utility Model Content

[0006] The purpose of the present application is to provide an integral titanium alloy pull rod to solve at least one problem existing in the prior art.

[0007] The technical solution of this application is:

[0008] An integral titanium alloy pull rod comprises: a pull rod body and double-ear joints arranged at both ends of the pull rod body, wherein:

[0009] The pull rod body comprises a straight section and sections of variable cross-section arranged at both ends of the straight section;

[0010] The outer surface of the straight segment has a first outer cylindrical surface, and the inner surface of the straight segment has a first inner cylindrical surface;

[0011] The outer surface of the variable cross-section segment has a first outer conical surface and a second outer cylindrical surface, the first outer conical surface is connected to the first outer cylindrical surface, and the inner surface of the variable cross-section segment has a continuous curved surface.

[0012] In at least one embodiment of the present application, the material of the integral titanium alloy pull rod is titanium alloy.

[0013] In at least one embodiment of the present application, a beveled surface is provided at a connection between the double-ear joint and the pull rod body.

[0014] In at least one embodiment of the present application, a circular hole is formed on the ear piece of the double-ear joint, and a stainless steel bushing is installed in the circular hole.

[0015] In at least one embodiment of the present application, the edge of the ear piece of the double-ear joint is concentric with the center of the circular hole.

[0016] In at least one embodiment of the present application, the double-ear joint is connected to the single-ear joint via a connecting piece, and the connecting piece is a bolt or a pin.

[0017] The utility model has at least the following beneficial technical effects:

[0018] The integral titanium alloy pull rod of the present application has a variable cross-section design, and the cross-sectional shape is transitioned from a double-ear cross-section to a straight section structure with a circular hollow center. This pull rod avoids stress concentration in the combined pull rod, has good fatigue performance, and is light in weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of an integral titanium alloy pull rod according to an embodiment of the present application;

[0020] Figure 2 It is a partial schematic diagram of an integral titanium alloy pull rod according to one embodiment of the present application;

[0021] Figure 3 is a schematic diagram of the outer surface of an integral titanium alloy pull rod according to one embodiment of the present application;

[0022] Figure 4 is a schematic diagram of the inner surface of an integral titanium alloy pull rod according to one embodiment of the present application;

[0023] Figure 5 is a cross-sectional view of an end portion of an integral titanium alloy tie rod according to an embodiment of the present application;

[0024] Figure 6 is a cross-sectional view of an integral titanium alloy tie rod according to one embodiment of the present application;

[0025] Figure 7 It is the parameter design of the integral titanium alloy tie rod in one embodiment of the present application;

[0026] Figure 8 This is a schematic diagram of the installation of an integral titanium alloy pull rod according to an embodiment of the present application.

[0027] in:

[0028] 1-tie rod body; 2-double-ear joint; 3-variable cross-section section; 4-equal straight section; 5-first outer cylindrical surface; 6-first outer conical surface; 7-second outer cylindrical surface; 8-first inner cylindrical surface; 9-continuous curved surface; 10-rod section; 11-bevel surface; 12-slot; 13-circular hole; 14-stainless steel bushing; 15-ear edge; 16-connector; 17-single-ear joint. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0031] The following is combined with Figures 1 to 8 This application is described in further detail.

[0032] The present application provides an integral titanium alloy pull rod, such as Figure 1 As shown, the integral titanium alloy pull rod comprises: a pull rod body 1 and double-ear joints 2 arranged at both ends of the pull rod body 1.

[0033] like Figure 2As shown, the two ends of the integral titanium alloy pull rod are double-ear structures, which are transitioned into a circular hollow equal straight structure in the middle through a variable cross-section. Specifically, the pull rod body 1 includes an equal straight section 4 and a variable cross-section section 3 arranged at both ends of the equal straight section 4; the outer surface of the equal straight section 4 has a first outer cylindrical surface 5, and the inner surface of the equal straight section 4 has a first inner cylindrical surface 8; the outer surface of the variable cross-section section 3 has a first outer conical surface 6 and a second outer cylindrical surface 7, the first outer conical surface 6 is connected to the first outer cylindrical surface 5, and the inner surface of the variable cross-section section 3 has a continuous curved surface 9. That is, the outer surface of the pull rod body 1 includes cylindrical surface, conical surface, cylindrical surface, conical surface, and cylindrical surface in sequence along the axial direction, and the inner surface of the pull rod body 1 includes continuous curved surface, cylindrical surface, and continuous curved surface in sequence along the axial direction. See the outer surface of the pull rod body 1. Figure 3 , inner surface see Figure 4 The space between the inner and outer surfaces of the pull rod body 1 forms a rod body cross section 10.

[0034] In a preferred embodiment of the present application, the material of the integral titanium alloy pull rod is titanium alloy.

[0035] In the preferred embodiment of the present application, the ends of the integral titanium alloy pull rod are processed through beveled surfaces 11 and notches 12 to form double-ear joints 2 at both ends. In this embodiment, a circular hole 13 is preferably opened on the ear piece of the double-ear joint 2, and a stainless steel bushing 14 is installed in the circular hole 13; the ear piece edge 15 of the double-ear joint 2 is arc-shaped, and the ear piece edge 15 is concentric with the center of the circular hole 13. The double-ear joints 2 at both ends of the integral titanium alloy pull rod are respectively connected to the single-ear joints 17 of other structures through connectors 16, which can transmit the axial load of the pull rod, and the connector 16 is a bolt or a pin.

[0036] The integral titanium alloy pull rod of the present application, the center distance A of the circular hole 13 of the double-ear joint 2 at both ends of the pull rod, the ear thickness B, the slot width C and depth D between the two ears, the straight section thickness E, etc. can be globally optimized according to the load-bearing requirements to obtain a relatively ideal design result.

[0037] The integral titanium alloy tie rod of the present application is different from the combined tie rod. The two ends of this tie rod are double-ear structures. Through the variable cross-section design, the cross-sectional shape transitions from a double-ear cross-section to a straight section structure with a circular hollow in the middle. This tie rod avoids stress concentration in the combined tie rod, has good fatigue performance, and is light in weight. The present application has the following beneficial effects: the rod body material is titanium alloy, which has high strength; the cross-sectional transition area can effectively avoid stress concentration and has good fatigue performance; it has strong designability; the outer surface of the rod is cylindrical and conical, and has good processing technology; under certain weight requirements, it has a large load-bearing capacity; the bushing in the middle of the end ear hole is replaceable and has good maintainability.

[0038] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An integral titanium alloy pull rod, characterized in that: include: A pull rod body (1) and double-ear joints (2) arranged at two ends of the pull rod body (1), wherein: The pull rod body (1) comprises a straight section (4) and sections (3) of varying cross-section arranged at both ends of the straight section (4); The outer surface of the straight section (4) has a first outer cylindrical surface (5), and the inner surface of the straight section (4) has a first inner cylindrical surface (8); The outer surface of the variable cross-section segment (3) comprises a first outer conical surface (6) and a second outer cylindrical surface (7), the first outer conical surface (6) is connected to the first outer cylindrical surface (5), and the inner surface of the variable cross-section segment (3) comprises a continuous curved surface (9).

2. The integral titanium alloy pull rod according to claim 1, characterized in that: The material of the integral titanium alloy pull rod is titanium alloy.

3. The integral titanium alloy pull rod according to claim 1, characterized in that: A bevel surface (11) is provided at the connection between the double-ear joint (2) and the pull rod body (1).

4. The integral titanium alloy pull rod according to claim 3, characterized in that: A circular hole (13) is provided on the ear piece of the double-ear joint (2), and a stainless steel bushing (14) is installed in the circular hole (13).

5. The integral titanium alloy pull rod according to claim 4, characterized in that: The edge (15) of the ear piece of the double-ear joint (2) is concentric with the center of the circular hole (13).

6. The integral titanium alloy pull rod according to claim 5, characterized in that: The double-ear joint (2) is connected to the single-ear joint (17) via a connecting piece (16), and the connecting piece (16) is a bolt or a pin.

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