An integrated tapered pin removal tool

Abstract

The present invention discloses an integrated tapered pin disassembly tool, comprising a U-shaped clamping block, an ejector nut and a set screw, wherein: the U-shaped clamping block comprises a block body, a first internal threaded hole is processed on the block body, and a through groove is processed from the rear end of the block body to the first internal threaded hole, thereby forming a U-shaped structure; a clamping groove for cooperating with a disassembly notch on the outer wall of the tapered bushing is processed on the bottom surface of the U-shaped clamping block; a second internal threaded hole is axially processed inside the ejector nut to cooperate with the external thread of the set screw, and the outer surface is divided into upper and lower parts, the upper part is an external hexagonal structure, and the lower part is a first external thread cooperating with the first internal threaded hole on the U-shaped clamping block; the outer surface of the set screw is a second external thread cooperating with the second internal threaded hole on the ejector nut, the upper end of the set screw is provided with a slotted notch, and the lower end is an external conical surface cooperating with the end face tapered hole of the tapered pin thread section.

Description

Technical Field

[0001] The present invention relates to the field of flight control technology, and in particular to an integrated tapered pin removal tool. Background Art

[0002] The end of the fly-by-wire aircraft flight control actuator usually adopts a tapered connection form with a tapered hole, a self-lubricating tapered pin and a tapered bushing, such as Figure 1 In order to reduce the clearance of the rudder system, when using and maintaining the actuator, it is necessary to first remove the tapered connection fastener part, and then remove the actuator to be maintained. The removal order of the tapered pin fastening part is shown in Figure 2 , usually:

[0003] Pull out the cotter pin; unscrew the nut; remove the gasket, use a flat-blade cutter to press against the disassembly notch of the tapered bushing to push out the tapered bushing, and use a wooden hammer to gently tap the threaded end of the tapered pin along the tapered surface of the tapered pin to make the tapered surface of the pin exit the tapered hole, and pull out the tapered pin.

[0004] Under long-term high load, the tapered bushing, tapered pin and tapered hole will produce micro-wear and fit tightly. It is impossible to eject the tapered bushing with just a flathead cutter, which makes it impossible to pull out the tapered pin. This makes it difficult to remove the tapered bushing and tapered pin, affecting the maintenance of the aircraft actuator.

[0005] To remove the tapered bushing in the field, a hammer is used to strike the head of the tapered pin, generating sufficient impact force to loosen the bushing in the tapered hole and facilitate its removal. To protect the tapered pin, a wooden hammer is often used when there's ample clearance for removal. However, the mounting space for aircraft actuators is typically relatively confined, so a wooden hammer's strokes aren't strong enough to loosen the connection. In this case, a metal hammer can be used to strike the pin over short distances, using the impact of multiple blows to loosen the bushing in the tapered hole. However, striking the pin head with a metal hammer can easily damage it, deforming it and rendering it unusable after removal. This also requires additional damage to the pin to maintain the actuator, resulting in high time and financial costs and poor maintenance. Summary of the Invention

[0006] The purpose of the present invention is to provide an integrated tapered pin disassembly tool for solving the problems of easy damage to the tapered pin and inconvenience in disassembly in existing disassembly methods.

[0007] In order to achieve the above tasks, the present invention adopts the following technical solutions:

[0008] An integrated tapered pin removal tool comprises a U-shaped clamping block, a knockout nut and a set screw, wherein:

[0009] The U-shaped clamping block includes a block body, a first internal threaded hole is machined on the block body, and a through groove is machined from the rear end of the block body to the first internal threaded hole, thereby forming a U-shaped structure; a clamping groove is machined on the bottom surface of the U-shaped clamping block for cooperating with the disassembly notch on the outer wall of the tapered bushing;

[0010] The ejector nut has a second internal threaded hole axially processed inside that cooperates with the set screw, and the outer surface is divided into two parts, the upper part is an external hexagonal structure, and the lower part is a first external thread that cooperates with the first internal threaded hole on the U-shaped clamping block;

[0011] The outer surface of the set screw is a second external thread that matches the second internal thread hole on the ejector nut. The upper end of the set screw is provided with a slotted notch, and the lower end is an external conical surface that matches the end face tapered hole of the tapered pin thread section.

[0012] Furthermore, the cross-section of the slot is a C-shaped structure, and the slot is U-shaped and arranged around the first internal threaded hole, including an upper slot, a left slot and a right slot, which are respectively used to cooperate with the disassembly notches at different positions on the tapered bushing.

[0013] Furthermore, a guide groove is processed from the rear end of the block to the left and right clamping grooves.

[0014] Furthermore, the diameter of the first internal threaded hole is larger than the width of the through groove, the width of the through groove is smaller than the outer diameter of the tapered bushing and larger than the outer diameter of the threaded section at the tail end of the tapered pin.

[0015] Furthermore, a plurality of disassembly notches are arranged along the circumferential direction at the end of the outer wall of the tapered bushing, and there is at least one pair of disassembly notches spaced 180 degrees apart in the circumferential direction.

[0016] Furthermore, the tail end of the tapered pin is a threaded section, and an end face tapered hole is provided on the threaded section.

[0017] Furthermore, the end earring of the actuator is installed on the fixing frame through a tapered pin, and a set of relative head tapered holes and tail tapered holes are opened on the fixing frame. After the tapered pin passes through the head tapered hole, it passes through the end earring of the actuator and then passes through the tail tapered hole. A tapered bushing is arranged in the tail tapered hole, and then the tapered pin is fixed by a tightening nut and a cotter pin.

[0018] The disassembly method of the disassembly tool is as follows:

[0019] Step 1: Pull out the cotter pin on the tapered pin, and then unscrew the fastening nut on the tapered pin;

[0020] Step 2: Push the U-shaped block through the guide groove so that the disassembly notch on the tapered bushing is engaged with the U-shaped block;

[0021] Step 3: Screw the ejector nut into the first internal threaded hole of the U-shaped clamping block;

[0022] Step 4: Screw the set screw into the second internal threaded hole of the ejector nut. Use a flat-blade driver to rotate the set screw until the outer conical surface at the lower end of the set screw contacts the end face tapered hole of the tapered pin thread segment.

[0023] Step 5: Use a wrench to rotate the ejector nut until the tapered bushing is loose and remove the bushing.

[0024] Step 6: Pull out the tapered pin along its axial direction.

[0025] Compared with the prior art, the present invention has the following technical features:

[0026] The U-shaped clamping block is small in size and suitable for the narrow space of the aircraft. The structure of the U-shaped clamping block is convenient for installation at the notch of the tapered bushing. The ejection nut, U-shaped clamping block and fixing screw are connected by threaded fastening, which is convenient for installation. The restraint reaction force between the connecting fasteners is utilized, and the tapered pin head does not need to be struck, so the tapered pin will not be damaged. The tool is easy to install and can be operated with an ordinary wrench, so that the fastener can be reliably and quickly disassembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the mounting structure for the actuator end;

[0028] Figure 2 This is an exploded view of the tapered pin disassembly process;

[0029] Figure 3 This is a schematic diagram of the structure of the disassembly tool of the present invention;

[0030] Figure 4 A schematic structural diagram of the disassembly tool of the present invention;

[0031] Figure 5 This is a schematic diagram of the disassembly tool of the present invention in use.

[0032] Explanation of the numbers in the figure: A1 fixing frame, A2 tapered pin, A3 head tapered hole, A4 tail tapered hole, A5 tapered bushing, A6 fastening nut, A7 cotter pin, A8 actuator end earring, A21 threaded segment, A22 end face tapered hole, A51 disassembly notch, 1 U-shaped block, 2 ejector nut, 3 set screw, 11 first internal threaded hole, 12 through slot, 13 slot, 14 left slot, 15 upper slot, 16 right slot, 17 guide slot, 21 second internal threaded hole, 22 first external thread, 23 external hexagonal structure, 31 second external thread, 32 external tapered surface, 33 slotted notch. DETAILED DESCRIPTION

[0033] Referring to the accompanying drawings, the present invention provides an integrated tapered pin removal tool, which is used in the following scenarios: Figure 1 As shown, the actuator end earring A8 is installed on the fixing frame A1 through a tapered pin A2, and a group of opposite head tapered holes A3 and tail tapered holes A4 are opened on the fixing frame A1. After the tapered pin A2 passes through the head tapered hole A3, it passes through the actuator end earring A8 and then passes through the tail tapered hole A4. A tapered bushing A5 is set in the tail tapered hole A4, and then the tapered pin A2 is fixed by a fastening nut A6 and a cotter pin A7 to achieve the installation of the flight control actuator; wherein, the tail end of the tapered pin A2 is a threaded section A21, and an end face tapered hole A22 is opened on the threaded section A21; the outer wall of the tapered bushing A5 is distributed with disassembly notches A51. In this embodiment, a plurality of disassembly notches A51 are arranged along the circumferential direction at the end of the outer wall of the tapered bushing A5, and there is at least a pair of disassembly notches A51 spaced 180° apart in the circumferential direction; as shown Figure 2 In the example, four disassembly notches A51 are arranged at intervals of 90°.

[0034] See also Figure 3 and Figure 4 The disassembly tool of the present invention comprises three parts, namely a U-shaped block 1, a knockout nut 2, and a set screw 3, wherein:

[0035] The U-shaped block 1 includes a block body, a first internal threaded hole 11 is processed on the block body, and a through groove 12 is processed from the rear end of the block body to the first internal threaded hole 11, thereby forming a U-shaped structure; a slot 13 for cooperating with the disassembly notch A51 on the outer wall of the tapered bushing A5 is processed on the bottom surface of the U-shaped block 1; the cross section of the slot 13 is a C-shaped structure, and the slot 13 is U-shaped and arranged around the first internal threaded hole 11, including an upper slot 15, a left slot 14 and a right slot 16, which are respectively used to cooperate with the disassembly notches A51 at different positions on the tapered bushing A5 to form a force application surface; a guide groove 17 is processed from the rear end of the block body to the left slot 14 and the right slot 16.

[0036] Optionally, the diameter of the first internal threaded hole 11 is larger than the width of the through groove 12, the width of the through groove 12 is smaller than the outer diameter of the tapered bushing A5, and larger than the outer diameter of the threaded section A21 at the tail end of the tapered pin A2, so that the U-shaped block 1 can be easily inserted into the outside of the tail end of the tapered pin A2 through the through groove 12 during installation.

[0037] The interior of the ejector nut 2 is machined with a second internal threaded hole 21 along the axial direction to cooperate with the external thread of the set screw 3. The outer surface is divided into two parts, the upper part is an external hexagonal structure 23 for cooperating with a wrench, and the lower part is a first external thread 22 that cooperates with the first internal threaded hole 11 on the U-shaped block 1.

[0038] The outer surface of the set screw 3 is a second external thread 31 that cooperates with the second internal thread hole 21 on the ejector nut 2. The upper end of the set screw 3 is provided with a slotted notch 33, and the lower end is an external conical surface 32 that cooperates with the end face tapered hole A22 of the threaded section A21 of the tapered pin A2.

[0039] See also Figure 5 , the working principle of the present invention is:

[0040] Using the guide groove 17 for guidance, the 2 to 3 disassembly notches A51 of the tapered bushing A5 are clamped through the U-shaped clamping groove 13 on the U-shaped clamping block 1, the ejector nut 2 is screwed into the first internal threaded hole 11, and the locking screw 3 is screwed into the second internal threaded hole 21 on the ejector nut 2. A flat-blade cutter is inserted into the flat-blade notch 33 on the locking screw 3 and rotated until the outer conical surface 32 at the lower end of the locking screw 3 contacts the end face tapered hole A22 of the threaded section A21 of the tapered pin A2. Then, the ejector nut 2 is rotated with a wrench to apply a tightening torque to the ejector nut 2. The ejector nut 2 will drive the locking screw 3 to push the tapered pin A2 axially, and the U-shaped clamping block 1 is clamped axially with the tapered bushing A5, so that the restraining reaction force of the tapered bushing A5 and the tapered pin A2 can be utilized to achieve rapid disassembly of the tapered bushing A5 and the tapered pin A2. Among them, when the U-shaped clamping block 1 is in use, its left clamping slot 14 and right clamping slot 16 must clamp the two disassembly notches A51 on the conical bushing A5 spaced 180° apart; if there is a disassembly notch A51 at the position of the conical bushing A5 corresponding to the upper clamping slot 15, the upper clamping slot 15 is used to clamp it, otherwise it is not used, and effective fixation can be achieved only by the left clamping slot 14 and the right clamping slot 16.

[0041] The disassembly steps using the tool of the present invention are:

[0042] Step 1: Pull out the cotter pin A7 on the tapered pin A2, and then unscrew the fastening nut A6 on the tapered pin A2;

[0043] Step 2: Push the U-shaped block 1 through the guide groove 17 so that the disassembly notch A51 on the tapered bushing A5 is engaged with the U-shaped block 1;

[0044] Step 3: Screw the ejector nut 2 into the first internal threaded hole 11 of the U-shaped block 1;

[0045] Step 4: Screw the set screw 3 into the second internal threaded hole 21 of the ejector nut 2. Use a flat-blade driver to rotate the set screw 3 until the outer tapered surface 32 at the lower end of the set screw 3 contacts the end tapered hole A22 of the threaded segment A21 of the tapered pin A2.

[0046] Step 5: Use a wrench to rotate the ejector nut 2 until the tapered bushing A5 is loose, and then remove the bushing.

[0047] Step 6: Pull out the tapered pin A2 along its axial direction.

[0048] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. An integrated tapered pin removal tool, characterized in that: It comprises a U-shaped block (1), a knockout nut (2) and a set screw (3), wherein: The U-shaped clamping block (1) comprises a block body, a first internal threaded hole (11) is machined on the block body, and a through groove (12) is machined from the rear end of the block body to the first internal threaded hole (11), thereby forming a U-shaped structure; a clamping groove (13) is machined on the bottom surface of the U-shaped clamping block (1) for cooperating with a disassembly notch (A51) on the outer wall of the tapered bushing (A5); The ejector nut (2) is provided with a second internal threaded hole (21) along the axial direction for cooperating with the set screw (3), and the outer surface is divided into two parts, the upper part is an external hexagonal structure (23), and the lower part is a first external thread (22) for cooperating with the first internal threaded hole (11) on the U-shaped block (1); The outer surface of the set screw (3) is a second external thread (31) that cooperates with the second internal thread hole (21) on the ejector nut (2). The upper end of the set screw (3) is provided with a slot (33), and the lower end is an external conical surface (32) that cooperates with the end face conical hole (A22) of the threaded section (A21) of the tapered pin (A2).

2. The integrated tapered pin removal tool according to claim 1, wherein: The cross section of the clamping groove (13) is a C-shaped structure. The clamping groove (13) is arranged in a U-shape around the first internal threaded hole (11), and includes an upper clamping groove (15), a left clamping groove (14), and a right clamping groove (16), which are respectively used to cooperate with disassembly notches (A51) at different positions on the tapered bushing (A5).

3. The integrated tapered pin removal tool according to claim 2, wherein: A guide groove (17) is processed from the rear end of the block toward the left clamping groove (14) and the right clamping groove (16).

4. The integrated tapered pin removal tool according to claim 1, wherein: The diameter of the first internal threaded hole (11) is larger than the width of the through groove (12), the width of the through groove (12) is smaller than the outer diameter of the tapered bushing (A5) and larger than the outer diameter of the threaded section (A21) at the tail end of the tapered pin (A2).

5. The integrated tapered pin removal tool according to claim 1, wherein: The disassembly notches (A51) are arranged in a plurality along the circumferential direction at the end of the outer wall of the tapered bushing (A5), and there is at least one pair of disassembly notches (A51) spaced 180 degrees apart in the circumferential direction.

6. The integrated tapered pin removal tool according to claim 1, wherein: The tail end of the tapered pin (A2) is a threaded section (A21), and an end face tapered hole (A22) is provided on the threaded section (A21).

7. The integrated tapered pin removal tool according to claim 1, wherein: The actuator end earring (A8) is mounted on a fixing frame (A1) via a tapered pin (A2). A set of opposite head tapered holes (A3) and tail tapered holes (A4) are provided on the fixing frame (A1). The tapered pin (A2) passes through the head tapered hole (A3), then through the actuator end earring (A8), and then through the tail tapered hole (A4). A tapered bushing (A5) is provided in the tail tapered hole (A4), and the tapered pin (A2) is then fixed via a tightening nut (A6) and a cotter pin (A7).

8. The integrated tapered pin removal tool according to claim 1, wherein: The disassembly method of the disassembly tool is as follows: Step 1: Pull out the cotter pin (A7) on the tapered pin (A2), and then unscrew the fastening nut (A6) on the tapered pin (A2); Step 2: Push the U-shaped block (1) through the guide groove (17) so that the disassembly notch (A51) on the tapered bushing (A5) is engaged with the U-shaped block (1); Step 3, screwing the ejector nut (2) into the first internal threaded hole (11) of the U-shaped block (1); Step 4, screw the set screw (3) into the second internal threaded hole (21) of the ejector nut (2), and use a flat-blade cutter to rotate the set screw (3) until the outer conical surface (32) at the lower end of the set screw (3) contacts the end face tapered hole (A22) of the threaded section (A21) of the tapered pin (A2); Step 5. Use a wrench to rotate the ejector nut (2) until the tapered bushing (A5) is loose, and remove the bushing. Step 6: Pull out the tapered pin (A2) along its axial direction.

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