Bushing installation tool with concentric requirement in narrow space

Abstract

The utility model discloses a bush installation tool with a concentric requirement in a narrow space. The bush installation tool comprises a bush press-fitting part and a bush centering part. The bushing press fitting part comprises a positioning shaft, a baffle, a sleeve, a transition sleeve, a pressing sleeve, a needle bearing and a large nut; and the bushing centering part comprises a step shaft, a workpiece, a bushing and a small nut. Firstly, the transition sleeve, the lining, the pressing sleeve and the positioning shaft sequentially pass through a large hole of a workpiece, then the needle bearing, the large nut, the sleeve and the baffle are sequentially installed on the positioning shaft, and pre-fixing of the installation position of the lining is completed; and the step shaft sequentially passes through the workpiece small hole and the bushing small hole, and the small nut is mounted on the step shaft, so that the concentricity requirement of the bushing and the workpiece is met. The large nut is screwed clockwise to enable the needle bearing to move downwards, and meanwhile the pressing sleeve and the lining are driven to move downwards till the lining is completely installed in the large hole of the workpiece. While the bushing is mounted, the concentricity of the bushing and a workpiece is ensured, and the applicable aperture range of the tool is increased due to the design of the transition sleeve.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bushing installation tool, especially to a bushing installation tool for narrow space and concentric requirement, and belongs to the technical field of airplane assembly. BACKGROUND

[0002] Most of the airplane workpieces are aluminum alloy, and the workpiece hole is easy to wear after a period of operation, in order to improve the wear resistance and service life of the hole, a bushing with high hardness and good wear resistance is installed in the hole, and the bushing can be replaced after the bushing is damaged. The outer diameter of the bushing and the inner diameter of the workpiece hole are interference fit, and the bushing and the workpiece body cannot be damaged during the installation of the bushing, and the limited installation space further increases the difficulty of the bushing installation work.

[0003] At present, the installation method of the bushing is basically combined with the press machine, but it is not suitable for the limited space area, and cannot meet the working condition with concentric requirement of the bushing. In order to meet the production demand, it is imperative to design a bushing installation tool which can guarantee the product quality, is suitable for limited space and can meet the concentric requirement. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a bushing installation tool for narrow space and concentric requirement, which can well solve the installation of the bushing with concentric requirement in the limited space, is simple to operate, low in labor intensity and high in applicability.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A narrow space and concentric requirement bushing installation tool, including two components bushing press-fit component and bushing centering component, bushing press-fit component is to exert external force on the bushing to make the bushing press into the workpiece; bushing centering component is to concentrically position the bushing and the workpiece. The bushing press-fit component includes a positioning shaft, a baffle, a sleeve, a transition sleeve, a press sleeve, a needle bearing and a large nut, one end of the positioning shaft is a cylinder and the other end is a threaded rod, the cylinder is flattened on one side near the end face, the flattened part is attached to the U-shaped groove plane part of the baffle, the other end of the baffle is a hand grip, the sleeve is a semi-closed cavity, the inner hole of the non-open end of the sleeve is clearance fit H9 / f9 with the diameter of the cylindrical part of the positioning shaft, the inner diameter of the open end of the sleeve is 2mm larger than the large hole inner diameter of the workpiece, the transition sleeve is located between the large hole of the workpiece and the press sleeve, its inner and outer diameters are clearance fit H9 / f9 with the press sleeve and the large hole of the workpiece, the press sleeve is located between the transition sleeve and the positioning shaft, its inner and outer diameters are clearance fit H9 / f9 with the transition sleeve and the positioning shaft, the press sleeve has a shoulder, so that the external force on the press sleeve can be transmitted to the surface of the bushing, the inner diameter of the needle bearing is clearance fit with the threaded rod part of the positioning shaft, and the outer diameter is equal to the shoulder diameter of the large nut. The bushing centering component includes a stepped shaft, a workpiece, a bushing and a small nut. One end of the stepped shaft is a stepped cylinder and the other end is a threaded rod, the stepped cylinder has diameters of φ6f9 and φ5f9, which are clearance fit H9 / f9 with the small hole inner diameter φ6H9 of the workpiece and the small hole inner diameter φ5H9 of the bushing respectively, the stepped shaft cylindrical part φ6f9 height = workpiece small hole height + 1, the stepped shaft cylindrical part φ5f9 height = bushing thickness + 1mm, which ensures that the centering component will not interfere with the entire assembly process of the bushing, and the small nut has a shoulder which cooperates with the threaded rod of the stepped shaft.

[0007] Further, the space height = the length of the threaded rod of the positioning shaft = the thickness of the large nut + the thickness of the needle bearing + the shoulder thickness of the press sleeve + the thickness of the bushing + 2mm, and the length of the cylindrical part of the positioning shaft = the thickness of the workpiece + the height of the sleeve + the thickness of the baffle + 5mm, which ensures that there is enough thread length to ensure the stroke during the installation of the bushing.

[0008] Further, the inner diameter of the open end of the sleeve is 2mm larger than the large hole inner diameter of the workpiece, and the depth of the sleeve is 3mm larger than the thickness of the bushing, which ensures that there is enough space to accommodate the sinking part of the transition sleeve and the press sleeve during the installation of the bushing.

[0009] Further, the inner and outer diameters of the transition sleeve are clearance fit H9 / f9 with the press sleeve and the large hole of the workpiece, which ensures that the transition sleeve can slide smoothly during the installation of the bushing and play a guiding role for the bushing. For different diameters of the large hole of the workpiece, only the corresponding diameter of the transition sleeve can be replaced without changing the size of other components to complete the installation of the bushing.

[0010] Further, the inner diameter of the needle bearing is in clearance fit with the threaded rod part of the positioning shaft, and the outer diameter is equal to the shoulder diameter of the large nut, and the addition of the needle bearing avoids the direct friction between the large nut and the pressing sleeve, and converts the sliding friction between the large nut and the pressing sleeve into rolling friction.

[0011] The method for installing the bushing using the tool comprises the following steps:

[0012] 1. Put the transition sleeve into the large hole of the workpiece, place the bushing on the transition sleeve, pass the pressing sleeve through the large hole of the workpiece so that the shoulder of the pressing sleeve is in abutment with the surface of the bushing, pass the positioning shaft through the inner hole of the pressing sleeve, and then install the needle bearing and the large nut on the positioning shaft in sequence, with the end face of the large nut being flush with the threaded end face of the positioning shaft;

[0013] 2. Adjust the relative positions of the small hole of the bushing and the small hole of the workpiece so that the centers of the two holes are substantially located on a center line, pass the stepped shaft through the small hole of the workpiece and the small hole of the bushing in sequence, and install the small nut on the threaded rod of the stepped shaft until the small nut is in abutment with the surface of the small hole of the bushing;

[0014] 3. Install the sleeve on the bottom of the large hole of the workpiece through the positioning shaft, with the end face of the open end of the sleeve being flush with the bottom surface of the large hole of the workpiece, and with the U-shaped slot of the baffle clamping the flattened plane of the positioning shaft;

[0015] 4. Turn the large nut clockwise by using a wrench, so that the needle bearing moves downward and drives the pressing sleeve and the bushing to move downward until the bushing is completely pressed into the large hole of the workpiece, at this time, the transition sleeve has fallen into the sleeve along with the bushing moving downward, and the turning of the large nut is stopped;

[0016] 5. Turn the large nut counterclockwise, adjust the vertical position of the positioning shaft in the large hole, and after the large nut is completely unscrewed from the positioning shaft, take out the baffle, the positioning shaft and the sleeve from below the large hole of the workpiece in sequence, and take out the large nut, the needle bearing and the pressing sleeve from above the large hole of the workpiece in sequence;

[0017] 6. Turn the small nut counterclockwise until the small nut is completely separated from the threaded part of the stepped shaft, and then take out the stepped shaft and the small nut, thus completing the installation process of the bushing.

[0018] The utility model has the following beneficial effects:

[0019] 1. The installation of the bushing with concentric requirement in a limited space is realized, the production demand is met, and a technical basis and design idea are provided for the installation tools of bushings in different types of limited spaces and with other requirements.

[0020] 2. The addition of the needle bearing avoids the direct friction between the large nut and the pressing sleeve, thereby avoiding the friction damage to the bushing caused by the friction rotation of the pressing sleeve and ensuring the quality of the product; the needle bearing converts the sliding friction between the large nut and the pressing sleeve into rolling friction, which not only reduces the labor intensity of workers, but also prolongs the service life of the tool.

[0021] 3. The design of the transition sleeve allows the tool to adapt to different workpiece hole diameters by simply changing the transition sleeve of different diameters, thus increasing the applicability of this tool.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 A schematic diagram of a bushing installation tool with concentricity requirements in a confined space;

[0024] Figure 2 Schematic diagram of the bushing installation tool operation process;

[0025] Figure 3 Schematic diagram of aircraft workpiece and bushing to be installed;

[0026] Figure 4 A schematic diagram of a bushing installation tool being used to install bushings on an aircraft workpiece.

[0027] Figure 5 A schematic diagram of an aircraft workpiece with the bushing installed;

[0028] The numbers in the diagram are explained as follows: 1 - positioning shaft, 2 - baffle, 3 - sleeve, 4 - transition sleeve, 5 - pressure sleeve, 6 - needle roller bearing, 7 - large nut, 8 - stepped shaft, 9 - workpiece, 10 - bushing, 11 - small nut. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] The embodiments provided in the following description are examples used to illustrate the implementation of this utility model. They are merely examples and are not intended to limit the scope of this utility model.

[0031] like Figure 1 As shown, this utility model provides a bushing installation tool for concentric spaces. The tool includes two parts: a bushing pressing component A and a bushing centering component B. The bushing pressing component A applies external force to the bushing 10 to press it into the workpiece 9. The bushing centering component B is used to position the bushing 10 and the workpiece 9 concentrically.

[0032] The bushing press-fitting component A includes a positioning shaft 1, a baffle plate 2, a sleeve 3, a transition sleeve 4, a pressing sleeve 5, a needle bearing 6, and a large nut 7. The positioning shaft 1 has a cylindrical body at one end and a threaded rod at the other end. The cylindrical body is flattened on one side near the end face. The flattened part is in contact with the U-shaped groove plane part of the baffle plate 2. The other end of the baffle plate 2 is a hand grip. The sleeve 3 is a semi-closed cavity. The inner hole of the non-open end of the sleeve 3 and the cylindrical part of the positioning shaft 1 have a clearance fit H9 / f9. The inner diameter of the open end of the sleeve 3 is 2mm larger than the inner diameter of the large hole of the workpiece. The transition sleeve 4 is located between the large hole of the workpiece 9 and the pressing sleeve 5. The inner and outer diameters of the transition sleeve 4 have clearance fits H9 / f9 with the pressing sleeve 5 and the large hole of the workpiece 9. The pressing sleeve 5 is located between the transition sleeve 4 and the positioning shaft 1. The inner and outer diameters of the pressing sleeve 5 have clearance fits H9 / f9 with the transition sleeve 4 and the positioning shaft 1. The pressing sleeve 5 has a shoulder, so that the external force acting on the pressing sleeve 5 can be transmitted to the surface of the bushing 10. The inner diameter of the needle bearing 6 has a clearance fit with the threaded rod part of the positioning shaft 1, and the outer diameter is equal to the shoulder diameter of the large nut 7.

[0033] The bushing centering component B includes a stepped shaft 8, a workpiece 9, a bushing 10, and a small nut 11. The stepped shaft 8 has a stepped cylinder at one end and a threaded rod at the other end. The diameters of the stepped cylinder are φ6f9 and φ5f9, respectively, which have clearance fits H9 / f9 with the inner diameter φ6H9 of the small hole of the workpiece 9 and the inner diameter φ5H9 of the small hole of the bushing 10, respectively. The height of the cylindrical part φ6f9 of the stepped shaft 8 is equal to the height of the small hole of the workpiece 9 plus 1. The height of the cylindrical part φ5f9 of the stepped shaft 8 is equal to the thickness of the bushing 10 plus 1mm, which ensures that the centering component does not interfere with the entire assembly process of the bushing 10. The small nut 11 has a shoulder, which cooperates with the threaded rod of the stepped shaft 8.

[0034] Further, the space height is equal to the length of the threaded rod of the positioning shaft 1, which is equal to the thickness of the large nut 7 plus the thickness of the needle bearing 6 plus the shoulder thickness of the pressing sleeve 5 plus the thickness of the bushing 10 plus 2mm. The length of the cylindrical part of the positioning shaft 1 is equal to the thickness of the workpiece 9 plus the height of the sleeve 3 plus the thickness of the baffle plate 2 plus 5mm, which ensures that the bushing 10 has sufficient thread length to ensure travel during installation.

[0035] Further, the inner diameter of the open end of the sleeve 3 is 2mm larger than the inner diameter of the large hole of the workpiece 9. The depth of the sleeve 3 is 3mm larger than the thickness of the bushing 10, which ensures that there is enough space to accommodate the sinking part of the transition sleeve 4 and the pressing sleeve 5 during the installation of the bushing 10.

[0036] Further, the inner and outer diameters of the transition sleeve 4 have clearance fits H9 / f9 with the pressing sleeve 5 and the large hole of the workpiece 9, which ensures that the transition sleeve 4 can smoothly slide during the installation of the bushing 10, and plays a guiding role for the bushing 10. For workpieces 9 with different diameters, the installation of the bushing 10 can be completed by replacing the corresponding diameter of the transition sleeve 4 without changing the sizes of other components.

[0037] Further, the inner diameter of the needle bearing 6 is in clearance fit with the threaded rod part of the positioning shaft 1, and the outer diameter is equal to the shoulder diameter of the large nut 7, the addition of the needle bearing 6 avoids the direct friction between the large nut 7 and the pressing sleeve 5, and converts the sliding friction between the large nut 7 and the pressing sleeve 5 into rolling friction.

[0038] The method for installing the bushing using the tool, with reference to Figure 2 Figure 5 , comprises the following steps:

[0039] As Figure 1 , the transition sleeve 4 is put into the large hole of the workpiece 9, the bushing 10 is placed on the transition sleeve 4, the pressing sleeve 5 is passed through the large hole of the workpiece 9 so that the shoulder of the pressing sleeve 5 is in close contact with the surface of the bushing 10, the positioning shaft 1 is passed through the inner hole of the pressing sleeve 5, and then the needle bearing 6 and the large nut 7 are installed on the positioning shaft 1 in sequence, and the end face of the large nut 7 is flush with the threaded end face of the positioning shaft 1;

[0040] As Figure 1 , the relative positions of the small hole of the bushing 10 and the small hole of the workpiece 9 are adjusted so that the centers of the two holes are basically located on a center line, the stepped shaft 8 is passed through the small hole of the workpiece 9 and the small hole of the bushing 10 in sequence, and the small nut 11 is installed on the threaded rod of the stepped shaft 8 until the small nut 11 is in close contact with the surface of the small hole of the bushing 10;

[0041] As Figure 1 , the sleeve 3 is installed on the bottom of the large hole of the workpiece 9 through the positioning shaft 1, the end face of the open end of the sleeve 3 is flush with the bottom surface of the large hole of the workpiece 9, and the flattened surface of the positioning shaft 1 is clamped by the U-shaped slot of the baffle 2;

[0042] As Figure 2 , the large nut 7 is turned clockwise by a wrench, the needle bearing 6 moves downward and drives the pressing sleeve 5 and the bushing 10 to move downward until the bushing 10 is completely pressed into the large hole of the workpiece 9, at this time the transition sleeve 4 has fallen into the sleeve 3 along with the bushing 10 moving downward, and the turning of the large nut 7 is stopped;

[0043] The large nut 7 is turned counterclockwise, the vertical position of the positioning shaft 1 in the large hole is adjusted, and after the large nut 7 is completely unscrewed from the positioning shaft 1, the baffle 2, the positioning shaft 1 and the sleeve 3 are taken out from below the large hole of the workpiece 9 in sequence, and the large nut 7, the needle bearing 6 and the pressing sleeve 5 are taken out from above the large hole of the workpiece 9 in sequence;

[0044] The small nut 11 is turned counterclockwise until the small nut 11 completely separates from the threaded part of the stepped shaft 8, and the stepped shaft 8 and the small nut 11 are taken out, thus completing the installation process of the bushing.

[0045] ​The utility model discloses technical scheme realizes the installation of the bushing of having concentric requirement under the limited space, satisfies production demand, provides technical basis and design train of thought for the bushing installation tool of different types limited space and other requirements. The addition of the needle bearing avoids the direct friction of big nut and pressure cover, thereby avoids the friction damage to the bushing due to the friction rotation of pressure cover, guarantees the quality of product, and the needle bearing changes the sliding friction of big nut and pressure cover into rolling friction, reduces the labor intensity of worker, and prolongs the life of tool. The design of transition cover makes the tool can adapt to different workpiece hole diameters under the condition of only replacing different diameter transition cover, and increases the application range of the tool.

Claims

1. A bushing installation tool for use in tight spaces and with concentric requirements, characterized in that, The tool comprises two parts, a bushing press-fitting part and a bushing centering part, the bushing press-fitting part is used to apply external force to the bushing to press the bushing into the workpiece, and the bushing centering part is used to concentrically position the bushing and the workpiece; The bushing press-fitting part comprises a positioning shaft, a baffle, a sleeve, a transition sleeve, a pressing sleeve, a needle bearing and a large nut, one end of the positioning shaft is a cylindrical body and the other end is a threaded rod, the cylindrical body is flattened on one side near the end face, the flattened part is attached to the U-shaped groove plane part of the baffle, the other end of the baffle is a hand grip, the sleeve is a semi-closed cavity, the inner hole of the non-open end of the sleeve is in clearance fit with the diameter of the cylindrical part of the positioning shaft, the transition sleeve is located between the large hole of the workpiece and the pressing sleeve, the pressing sleeve is located between the transition sleeve and the positioning shaft, and the inner and outer diameters of the pressing sleeve are in clearance fit with the transition sleeve and the positioning shaft, the pressing sleeve has a shoulder, so that the external force received by the pressing sleeve can be transmitted to the surface of the bushing; The bushing centering part comprises a stepped shaft, a workpiece, a bushing and a small nut, one end of the stepped shaft is a stepped cylindrical body and the other end is a threaded rod, the stepped cylindrical body is in clearance fit with the workpiece and the bushing respectively, and the small nut has a shoulder and cooperates with the threaded rod of the stepped shaft.

2. A bushing installation tool for tight spaces and concentric requirements according to claim 1, characterized in that, The space height-2 = the length of the threaded rod of the positioning shaft = the thickness of the large nut + the thickness of the needle bearing + the thickness of the shoulder of the pressing sleeve + the thickness of the bushing, so as to ensure that there is enough thread length to ensure the stroke during the installation of the bushing.

3. A bushing installation tool for tight spaces and concentric requirements according to claim 1, characterized in that, The length of the cylindrical part of the positioning shaft = the thickness of the workpiece + the height of the sleeve + the thickness of the baffle + 5, so as to ensure that there is enough thread length to ensure the stroke during the installation of the bushing.

4. A bushing installation tool for tight spaces and concentric requirements according to claim 1, characterized in that, The inner diameter of the open end of the sleeve is 2mm larger than the inner diameter of the large hole of the workpiece, and the depth of the sleeve is 3mm larger than the thickness of the bushing, so as to ensure that there is enough space to accommodate the sinking part of the transition sleeve and the pressing sleeve during the installation of the bushing.

5. A bushing installation tool for tight spaces and concentric requirements according to claim 1, characterized in that, The inner and outer diameters of the transition sleeve are in clearance fit with the pressing sleeve and the large hole of the workpiece, so as to ensure that the transition sleeve can smoothly slide during the installation of the bushing and guide the bushing.

6. A bushing installation tool for tight spaces and concentric requirements according to claim 1, characterized in that, The inner diameter of the needle bearing is in clearance fit with the threaded rod part of the positioning shaft, and the outer diameter is equal to the diameter of the shoulder of the large nut, and the addition of the needle bearing changes the sliding friction between the large nut and the pressing sleeve into rolling friction.

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