A split pin installation aid

Abstract

The utility model relates to a kind of cotter pin installation auxiliary tools, the installation auxiliary tool is overall cylindrical structure, hollow and have hexagonal cavity and cylindrical cavity that are connected along axial direction inside;Cylindrical cavity is formed by a section of annular side wall surrounding;Rectangular recess extending along axial direction is provided in the middle of first side wall;First gap is provided between second side wall and third side wall, and first gap is parallelly arranged with third side wall;Second gap is provided between fifth side wall and sixth side wall, and second gap is parallelly arranged with fifth side wall;First channel is opened at the junction of annular side wall and third side wall, and it is through wall thickness;Second channel is opened at the junction of annular side wall and fifth side wall, and it is through wall thickness;The above-mentioned installation auxiliary tool can fix cotter pin, so that cotter pin cannot shake.

Description

Technical Field

[0001] This utility model belongs to the field of manual tool technology, specifically, it relates to an auxiliary tool for installing cotter pins. Background Technology

[0002] With the development of the aviation industry, the number of helicopters has increased rapidly, and the flight time of a single helicopter has also increased significantly. This has placed higher demands on the speed and safety of helicopter component replacement. For example, the driveshaft of a certain type of helicopter is frequently disassembled and installed, and the installation of the cotter pin at the end of the driveshaft can significantly affect the overall installation process.

[0003] In the existing technology, the cotter pin is always in a free state during installation, which makes it easy to wobble and makes installation difficult. It is also easy to damage the threads and drive shaft during installation. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, this utility model provides a cotter pin installation auxiliary tool. This tool can fix the cotter pin in place, preventing it from wobbling and ensuring its stability. This solves the problem of cotter pins being prone to wobbling when installed on drive shafts, which makes installation difficult.

[0005] The present invention adopts the following specific technical solution: This utility model provides a cotter pin installation auxiliary tool. The installation auxiliary tool is cylindrical in shape, hollow inside, and has a regular hexagonal cavity and a cylindrical cavity that are connected along the axial direction; the regular hexagonal cavity and the cylindrical cavity are concentrically arranged. The cylindrical cavity is formed by a section of annular sidewall; the regular hexagonal cavity is formed by a first sidewall, a second sidewall, a third sidewall, a fourth sidewall, a fifth sidewall, and a sixth sidewall arranged sequentially along the circumference. The diameter of the cylindrical cavity is smaller than the diameter of the inscribed circle of the regular hexagonal cavity, and a stepped surface is formed at the junction of the regular hexagonal cavity and the cylindrical cavity; A rectangular groove extending axially is provided in the middle of the first sidewall; A first gap is provided between the second sidewall and the third sidewall, penetrating the second sidewall, and the first gap is arranged parallel to the third sidewall; A second gap is provided between the fifth sidewall and the sixth sidewall, penetrating the sixth sidewall, and the second gap is arranged parallel to the fifth sidewall; A first channel penetrating the wall thickness is provided at the junction of the annular sidewall and the third sidewall; A second channel penetrating the wall thickness is provided at the junction of the annular sidewall and the fifth sidewall.

[0006] Preferably, the rectangular groove, the first gap, and the second gap all have the same depth as the regular hexagonal cavity.

[0007] Preferably, both the first gap and the second gap have chamfers on both sides of their end faces.

[0008] Preferably, the cross-sectional shape of both the first channel and the second channel is rectangular.

[0009] Preferably, the cross-sectional areas of the first channel and the second channel gradually decrease radially from the outside to the inside.

[0010] Preferably, it is made of a metallic material.

[0011] Preferably, the metal material is stainless steel.

[0012] Preferably, the ratio of the depth of the regular hexagonal cavity to the depth of the cylindrical cavity is 1.5.

[0013] The cotter pin installation auxiliary tool of this utility model has the following advantages: During cotter pin installation, this installation aid can hold the cotter pin in place, preventing it from wobbling and ensuring its stability. Simultaneously, this aid restricts the movement of the flathead cutter used for installing the cotter pin, limiting its range of motion and preventing it from leaving the working area. This improves cotter pin installation efficiency and ensures the safety of the threads and drive shaft. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 A perspective view of the cotter pin installation auxiliary tool provided by this utility model.

[0015] Figure label: 1-Installation auxiliary tool; 2-Slotted cutter; 3-Nut; 4-Cotter pin; 101-Annular sidewall; 102-First sidewall; 103-Second sidewall; 104-Third sidewall; 105-Fourth sidewall; 106-Fifth sidewall; 107-Sixth sidewall; 108-Stepped surface; 109-Rectangular groove; 110-First gap; 111-Second gap; 112-First channel; 113-Second channel; 114-Chamfer. Detailed Implementation

[0016] To make the technical solutions and advantages of the embodiments of this utility model clearer, the exemplary embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0017] This utility model embodiment provides a cotter pin installation auxiliary tool 1, such as... Figure 1 As shown, the installation auxiliary tool 1 has a cylindrical structure, which is hollow inside and has a regular hexagonal cavity and a cylindrical cavity that are connected along the axial direction. Both ends of the installation auxiliary tool 1 are open, and the two ends are the first end and the second end, respectively. The first end has a regular hexagonal cavity for fitting with the nut 3, and the first end face has a regular hexagonal opening. The second end has a cylindrical cavity for the end of the drive shaft mounting bolt to pass through, and the second end face has a circular opening. The regular hexagonal cavity and the cylindrical cavity are concentrically arranged. The installation auxiliary tool 1 is made of metal materials, such as stainless steel or titanium alloy.

[0018] The cylindrical cavity is formed by a section of annular sidewall 101; as Figure 1 As shown, the regular hexagonal cavity is formed by a first sidewall 102, a second sidewall 103, a third sidewall 104, a fourth sidewall 105, a fifth sidewall 106, and a sixth sidewall 107 arranged sequentially along the circumference; the first sidewall 102, the second sidewall 103, the third sidewall 104, the fourth sidewall 105, the fifth sidewall 106, and the sixth sidewall 107 are all planes along the vertical direction, which is the axial direction of the installation auxiliary tool 1.

[0019] The diameter of the cylindrical cavity is smaller than the diameter of the inscribed circle of the regular hexagonal cavity. A stepped surface 108 is formed at the junction of the regular hexagonal cavity and the cylindrical cavity. The stepped surface 108 contacts and positions the nut 3, and also presses against the two prongs of the cotter pin 4 to fix the cotter pin 4. The depth ratio of the regular hexagonal cavity to the cylindrical cavity is 1.5, that is, the depth of the regular hexagonal cavity is 1.5 times the depth of the cylindrical cavity.

[0020] like Figure 1 As shown, a rectangular groove 109 extending axially is provided in the middle of the first sidewall 102. The rectangular groove 109 has the same depth as the regular hexagonal cavity, that is, the rectangular groove 109 and the regular hexagonal cavity extend to the stepped surface 108. The rectangular groove 109 is used to engage and limit the round head of the cotter pin 4. The cotter pin 4 is fixed in place by the combined action of the stepped surface 108 and the rectangular groove 109.

[0021] A first gap 110 is provided between the second sidewall 103 and the third sidewall 104, penetrating the second sidewall 103 and parallel to the third sidewall 104, which extends to the outer wall surface of the installation aid 1. The first gap 110 is formed by cutting away a portion of the second sidewall 103. The first gap 110 connects the regular hexagonal cavity with the external space of the installation aid 1. A second gap 111 is provided between the fifth sidewall 106 and the sixth sidewall 107, penetrating the sixth sidewall 107 and parallel to the fifth sidewall 106, which extends to the outer wall surface of the installation aid 1. The second gap 111 is formed by cutting away a portion of the sixth sidewall 107. The second gap 111 connects the regular hexagonal cavity with the external space of the installation aid 1. The first gap 110 and the second gap 111 allow the two forked prongs of the cotter pin 4 to pass through, facilitating the fitting of the installation aid onto the nut 3. The depth of the first gap 110 and the depth of the second gap 111 are both the same as the depth of the regular hexagonal cavity. Both the first gap 110 and the second gap 111 have chamfers 114 on both sides of their end faces. The two sides of the first gap 110 formed on the first end face are chamfered, and the two sides of the second gap 111 formed on the first end face are also chamfered.

[0022] Along the axial direction of the installation aid 1, a first channel 112 penetrating the wall thickness is formed at the junction of the annular sidewall 101 and the third sidewall 104; a second channel 113 penetrating the wall thickness is formed at the junction of the annular sidewall 101 and the fifth sidewall 106. The first channel 112 and the second channel 113 are used to allow the slotted cutter 2 to pass through when installing the cotter pin 4. The cross-sectional shape of the first channel 112 and the second channel 113 is rectangular, and the cross-sectional area of ​​the first channel 112 and the second channel 113 gradually decreases radially from the outside to the inside.

[0023] Taking the installation auxiliary tool 1 for adapting to a #17 nut 3 as an example, the installation auxiliary tool 1 is cylindrical in shape. A regular hexagonal cavity is provided at the first end, and a circular cavity formed by a circular through-hole is provided at the second end. The circular through-hole communicates with the regular hexagonal cavity. The centers of the circular cavity and the regular hexagonal cavity are aligned and on the same straight line, penetrating the entire cylinder. A rectangular groove 109 is provided at the 6 o'clock position of the regular hexagonal cavity. The two sidewalls of the rectangular groove 109, located at the upper left and upper right, extend downwards through the entire cylinder, forming a first gap 110 and a second gap 111. A chamfer 114 structure is provided on each side of these two gaps. On the cylindrical sidewalls of the upper left and upper right sides of the rectangular groove 109, a rectangular channel is provided, namely a first channel 112 and a second channel 113, which connect to the internal cavity.

[0024] The specific process for installing the cotter pin 4 using the aforementioned installation auxiliary tool 1 is as follows: The first step is to insert the cotter pin 4 into the safety hole of the nut 3 and bend the two tail legs.

[0025] The second step is to align the rectangular groove 109 of the installation auxiliary tool 1 with the round head of the cotter pin 4, and then put the installation auxiliary tool 1 on the nut 3. If the tail of the cotter pin 4 has not been cut to the standard length in advance, the two forked tails of the cotter pin 4 should be inserted into the first gap 110 and the second gap 111 respectively.

[0026] The third step is to align the flat-blade cutter 2 with the tail of the cotter pin 4 at the first channel 112 and the second channel 113.

[0027] The fourth step is to use a hammer to strike the tail of the cotter pin 4 to the designated position using a flathead cutter 2. If the tail is not cut to the appropriate length beforehand, it can be struck directly and will break off on its own without affecting its actual use.

[0028] After the cotter pin 4 is installed, remove the installation tool 1 from the nut 3.

[0029] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0030] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A cotter pin installation auxiliary tool, characterized in that, The installation aid is a cylindrical structure with a hollow interior and an axially connected regular hexagonal cavity and a cylindrical cavity; the regular hexagonal cavity and the cylindrical cavity are concentrically arranged. The cylindrical cavity is formed by a section of annular sidewall; the regular hexagonal cavity is formed by a first sidewall, a second sidewall, a third sidewall, a fourth sidewall, a fifth sidewall, and a sixth sidewall arranged sequentially along the circumference. The diameter of the cylindrical cavity is smaller than the diameter of the inscribed circle of the regular hexagonal cavity, and a stepped surface is formed at the junction of the regular hexagonal cavity and the cylindrical cavity; A rectangular groove extending axially is provided in the middle of the first sidewall; A first gap is provided between the second sidewall and the third sidewall, penetrating the second sidewall, and the first gap is arranged parallel to the third sidewall; A second gap is provided between the fifth sidewall and the sixth sidewall, penetrating the sixth sidewall, and the second gap is arranged parallel to the fifth sidewall; A first channel penetrating the wall thickness is provided at the junction of the annular sidewall and the third sidewall; A second channel penetrating the wall thickness is provided at the junction of the annular sidewall and the fifth sidewall.

2. The cotter pin installation auxiliary tool according to claim 1, characterized in that, The rectangular groove, the first gap, and the second gap all have the same depth as the regular hexagonal cavity.

3. The cotter pin installation auxiliary tool according to claim 1, characterized in that, Both the first gap and the second gap have chamfers on both sides of the end face.

4. The cotter pin installation auxiliary tool according to claim 1, characterized in that, Both the first channel and the second channel have rectangular cross-sectional shapes.

5. The cotter pin installation auxiliary tool according to claim 4, characterized in that, Along the radial direction from the outside to the inside, the cross-sectional area of ​​the first channel and the second channel gradually decreases.

6. The cotter pin installation auxiliary tool according to claim 1, characterized in that, It is made of metal.

7. The cotter pin installation auxiliary tool according to claim 6, characterized in that, The metal material is stainless steel.

8. The cotter pin installation auxiliary tool according to any one of claims 1-7, characterized in that, The depth ratio of the regular hexagonal cavity to the depth of the cylindrical cavity is 1.5.

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