Oil screen assembly method

Abstract

A method for assembling an oil control ring, comprising the steps of: providing an oil control ring to be assembled; providing a glue, the glue being a mixture of a first component and a second component, the first component being composed of an epoxy resin and a fluoroelastomer compound, the second component being a silane coupling agent, the mass ratio of the first component to the second component being 100:33; applying the glue to the oil control ring and a mounting groove, and then pushing the oil control ring into the mounting groove; and placing the assembled oil control ring and the mounting groove in a curing environment for curing, the curing environment being curing at room temperature for at least 24 hours, or curing at a temperature of 121 DEG C to 149 DEG C for at least 1 hour.

Description

Technical Field

[0001] This invention relates to an assembly method for aircraft engine components, specifically to an assembly method for an oil baffle ring. Background Technology

[0002] When the gear shaft of an aero-engine transmission system rotates at high speed, the splined joint between the gear shaft and the transmission rod requires proper lubrication. To ensure effective lubrication, a groove is created at the gear shaft spline and an oil retainer ring is installed. The oil retainer ring is typically made of synthetic rubber and usually requires adhesive to bond it to the groove on the gear shaft, thus preventing it from falling off even as the gear shaft rotates at high speed. The assembly process of the oil retainer ring plays a crucial role in ensuring its proper functioning.

[0003] The traditional oil baffle assembly process usually involves directly removing the old oil baffle from the groove of the gear shaft, then applying adhesive to the outer surface of the new oil baffle before inserting it into the groove of the gear shaft, and waiting for the adhesive to solidify to complete the installation.

[0004] However, existing oil baffle ring assembly processes often suffer from problems such as poor adhesion, damage to the oil baffle ring, and scratches on the gear shaft groove surface, resulting in unsatisfactory assembly results. Improving the assembly quality of oil baffle rings is a pressing issue that needs to be addressed. Summary of the Invention

[0005] The purpose of this invention is to provide an oil baffle ring assembly method that enables the oil baffle ring to have a better bonding effect.

[0006] The above-mentioned oil baffle ring assembly method includes the following steps: providing an oil baffle ring to be assembled; providing an adhesive, wherein the adhesive is a mixture of a first component and a second component, the first component being composed of epoxy resin and fluororubber compound, and the second component being a silane coupling agent, wherein the mass ratio of the first component to the second component is 100:33; applying the adhesive to the oil baffle ring and the mounting groove, and then pushing the oil baffle ring into the mounting groove; placing the assembled oil baffle ring and the mounting groove in a curing environment for curing, wherein the curing environment is for curing at room temperature for at least 24 hours, or for curing at a temperature of 121℃~149℃ for at least 1 hour.

[0007] In one or more embodiments, the method is used for assembling an oil baffle ring in an aero-engine transmission system, the aero-engine transmission system including a gear shaft, and the mounting groove being a gear shaft groove disposed on the inner circumference of the gear shaft.

[0008] In one or more embodiments, the method further includes: providing a stopper fixture made of an elastic material and having an interference fit with the inner bore of the gear shaft; after pushing the oil baffle ring into the mounting groove, installing the stopper fixture into the inner bore of the gear shaft; wherein, during curing, the stopper fixture presses the oil baffle ring tightly into the mounting.

[0009] In one or more embodiments, the stopper tooling includes a limiting part and a force-applying part. The limiting part can abut against the end face of the gear shaft to restrict the movement of the stopper tooling along the axial direction of the gear shaft. The force-applying part is interference-fitted with the inner hole of the gear shaft. During curing, the force-applying part presses the oil baffle ring into the mounting groove.

[0010] In one or more embodiments, before providing the oil baffle ring to be assembled, the oil baffle ring assembly method further includes: determining whether it is the first time the oil baffle ring is being installed; if the determination result is yes, then proceeding to the step of providing the oil baffle ring to be assembled; if the determination result is no, then performing the following steps: removing the original oil baffle ring; cleaning the gear shaft groove; and inspecting the appearance of the gear shaft groove.

[0011] In one or more embodiments, cleaning the gear shaft groove includes: cleaning the gear shaft groove with compressed gas in the pressure range of 276 kPa to 483 kPa; and removing dust from the gear shaft using a dry jet grinding method.

[0012] In one or more embodiments, the oil baffle ring is pushed into the mounting groove radially along the gear shaft.

[0013] In one or more embodiments, providing an oil baffle ring to be assembled includes: grinding the surface of the oil baffle ring to give it a roughness.

[0014] The above-mentioned oil baffle ring assembly method uses adhesive components and proportions that can provide better bonding effect, which improves the bonding effect between the gear shaft groove and the oil baffle ring, thereby improving the assembly quality of the oil baffle ring. Attached Figure Description

[0015] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0016] Figure 1 This is a flowchart illustrating the assembly method of the oil baffle ring in a transmission system under one embodiment.

[0017] Figure 2 This is a schematic diagram of the oil baffle ring assembly under one implementation method;

[0018] Figure 3 This is a schematic diagram of the gear shaft groove area in one embodiment;

[0019] Figure 4 This is a schematic diagram of the stopper tooling structure under one implementation method;

[0020] Figure 5 This is a schematic diagram of the auxiliary stopper assembly state under one implementation method. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description to provide a full understanding of the invention. However, the invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual applications without departing from the spirit of the invention. Therefore, the scope of protection of the invention should not be limited by the content of these specific embodiments. It should be noted that these and subsequent accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the actual scope of protection claimed by the invention.

[0022] In the existing oil baffle ring installation process, the groove of the gear shaft is often not surface-treated during installation, resulting in poor adhesion. At the same time, the mixing ratio of the adhesive is not clear, and the curing effect of the adhesive is not good.

[0023] Figure 1 The steps in the oil baffle ring assembly method are shown. This assembly method can effectively improve the assembly quality of the oil baffle ring. The assembly method of this oil baffle ring will be described below in conjunction with one or more specific embodiments.

[0024] First, an oil baffle ring to be assembled is provided. In one specific embodiment, providing the oil baffle ring to be assembled includes step S2.

[0025] Step S2 involves polishing the oil baffle ring. In one specific embodiment, the oil baffle ring 1 is made of synthetic rubber. Sandpaper can be used to polish the surface where the oil baffle ring 1 is bonded to the adhesive, giving it a certain roughness. For example, in one embodiment, the surface roughness of the oil baffle ring 1 bonded to the adhesive is not less than Ra3.2, facilitating the adhesion of the adhesive to the bonded surface. Of course, oil baffle rings made of other materials can be polished in other ways to achieve sufficient surface roughness.

[0026] Of course, in some other suitable implementations, the oil baffle ring with a certain roughness surface can be provided by the supplier.

[0027] Then, step S5 is performed: preparing the adhesive. Specifically, the adhesive is a mixture of a first component and a second component. The first component of the adhesive is epoxy resin and fluororubber compound, and the second component is a silane coupling agent (i.e., a catalyst). The mass ratio of the first component to the second component is 100:33.

[0028] Then, step S6 is performed to apply adhesive to the oil baffle ring 1 and the mounting groove, and push the oil baffle ring 1 into the mounting groove.

[0029] Finally, step S8 is performed: curing the adhesive. Specifically, the assembled oil baffle ring 1 and the mounting groove are placed in a curing environment for curing. In one embodiment, the curing environment is at room temperature for at least 24 hours. In another embodiment, the adhesive prepared in step S5 is used, and it can be placed at 121°C to 149°C for at least 1 hour to cure the adhesive, further improving the bonding effect of the adhesive.

[0030] After curing is complete, the oil baffle ring 1 is assembled.

[0031] The oil baffle ring assembly method described above can be used for assembling oil baffle rings in aero-engine transmission systems, which include, for example, […]. Figure 2 The gear shaft 2 shown has a mounting groove 3 located on the inner circumference of the gear shaft 2. The following descriptions, one or more, use the assembly of an oil baffle ring in an aero-engine transmission system as an example. It is understood that this assembly method is applicable to assembling oil baffle rings in other environments.

[0032] In one embodiment of this oil baffle ring assembly method, during the curing process, the gear shaft 2 is as follows: Figure 5 As shown, place it in a vertical position to allow the adhesive to cure.

[0033] In one embodiment of this oil baffle ring assembly method, step S5 involves estimating the required amount of adhesive based on the actual coating area, which includes the bonding surface of the oil baffle ring 1, the gear shaft groove 3, and its outer edge. The adhesive can then be prepared by mixing an appropriate proportion of resin and catalyst. In one embodiment, preparation is completed by mixing the first and second components in, for example, a metal or uncoated paper container, and stirring the mixture until no stratification occurs in the resulting adhesive, thereby maximizing the adhesive's bonding effectiveness.

[0034] During the operation of step S5, the following aspects should be noted:

[0035] 1) Epoxy resins and catalysts are harmful to the skin and eyes. When preparing and using adhesives, necessary protection should be taken for the respiratory tract, skin and eyes. The operation should be carried out in a well-ventilated area and clean disposable gloves made of latex, nylon or polyethylene should be worn.

[0036] 2) The amount of adhesive mixed at one time should not exceed 450g, otherwise the heat generated during the mixing of the adhesive will cause the mixed adhesive to decompose, and the toxic gas produced will harm the human body.

[0037] 3) If the adhesive is stored below room temperature, make sure the adhesive reaches room temperature before opening, otherwise the low temperature will reduce the strength of the adhesive.

[0038] 4) The effective working time of the mixed adhesive is about 30 minutes. It should be used as soon as possible after mixing. The total amount of adhesive and the ambient temperature will affect the service life of the adhesive.

[0039] In one embodiment of this oil baffle ring assembly method, in step S6, the oil baffle ring 1 is installed into the gear shaft groove 3, ensuring that the oil baffle ring 1 is pushed into the gear shaft groove 3 radially, rather than at an angle, to avoid damage to the oil baffle ring 1; the oil baffle ring 1 is rotated 1-2 turns circumferentially to ensure that the adhesive is evenly distributed between the contact surfaces of the oil baffle ring 1 and the gear shaft groove 3, avoiding localized poor adhesion; then excess adhesive is removed, for example, by wiping the oil baffle ring 1 and the gear shaft 2 with a cloth soaked in anhydrous ethanol. During the operation, it is necessary to avoid dripping anhydrous ethanol from the cloth into the gear shaft groove 3, otherwise it will affect the adhesive and thus affect the bonding effect of the oil baffle ring 1.

[0040] In one embodiment of the oil baffle ring assembly method, before step S2, preparatory work needs to be done before assembling the oil baffle ring 1. First, step S1 is executed: determine whether it is the first time to install the oil baffle ring 1. In one embodiment, the determination result of step S1 is yes, and step S2 is executed.

[0041] In one embodiment of the oil baffle ring assembly method, step S3 is further included: cleaning the oil baffle ring 1 and the gear shaft groove 3, the gear shaft groove 3 area as shown in the figure. Figure 2 As shown, anhydrous ethanol or industrial alcohol can be used to clean the oil retaining ring 1 and the gear shaft groove 3 to avoid other impurities from being mixed in during the bonding process. Ensuring the cleanliness of the surface of the gear shaft groove 3 is beneficial to improving the bonding effect.

[0042] During the operation in step S3, it is important to note that anhydrous ethanol is flammable and harmful to the skin and eyes. When using it, necessary protection should be taken for the respiratory tract, skin and eyes to avoid repeated and prolonged contact with anhydrous ethanol, and it should be used in a well-ventilated area. After cleaning the oil baffle ring 1 and gear shaft groove 3, disposable gloves made of nylon or polyethylene should be worn when touching them. Since the grease on the operator's hands may contaminate the bonding surface, the bonding surface of the oil baffle ring 1 and gear shaft groove 3 should not be touched with bare hands.

[0043] In another embodiment, if the result of step S1 is negative, and the oil baffle ring 1 needs to be repaired and reinstalled, then steps S11 to S13 are also included:

[0044] Step S11: Remove the original oil baffle ring, such as Figure 3 As shown, in the assembled state, the oil baffle ring 1 is located in the groove 3 of the spline part of the gear shaft 2. The damaged old oil baffle ring needs to be removed first.

[0045] Step S12: Preliminary cleaning of the gear shaft groove 3 area, which can be divided into three sub-steps. Step S121: Removing residual adhesive. An aluminum or other hard plastic scraper tool can be used to scrape away the adhesive remaining in the gear shaft groove 3 after removing the old oil retainer ring. During the operation, care should be taken not to damage the base material of the gear shaft 1 to effectively protect the surface of the gear shaft groove 3. Step S122: Cleaning the gear shaft groove 3. Compressed gas is used to clean the gear shaft groove 3 area. The pressure range of the compressed gas is 276 kPa to 483 kPa. During the cleaning process, [the following steps can be taken]. The surface of the gear shaft groove 3 is inspected to ensure that the thickness of the removed material of the gear shaft 2 does not exceed 0.0249mm. After testing, it was verified that ensuring that the thickness of the removed material of the gear shaft 2 does not exceed 0.0249mm can ensure that the surface of the gear shaft groove 3 is cleaned well while ensuring that the structure of the gear shaft groove 3 itself is not damaged. Step S123: Dust removal of gear shaft 2. After cleaning the gear shaft groove 3 with compressed gas, the gear shaft 2 is dusted by dry spraying with clean and dry workshop air source to remove the metal shavings remaining on the gear shaft 2 after cleaning.

[0046] During the operation of step S122, it should be noted that when using compressed gas to clean the gear shaft groove 3, the flying metal shavings may damage the eyes. Eye protection measures should be taken, and the compressed gas nozzle should not be pointed at yourself or others.

[0047] Step S13: Visual inspection. In one embodiment, a 10x magnifying glass and a white light source are used to visually inspect the surface of the gear shaft groove 3. There should be no obvious cracks, burrs, or metal protrusions. If the operator believes that there are burrs or metal protrusions that need to be removed during the inspection, they should be removed.

[0048] In the existing oil baffle ring installation process, tooling is usually not used to fix the oil baffle ring during the curing process of the adhesive. This may cause the oil baffle ring to loosen or shift, affecting the bonding effect.

[0049] In one embodiment of the oil baffle ring assembly method, step S4 is further included: providing a stopper fixture 4, which is designed and manufactured according to the inner hole size of the gear shaft 2 to assist in the assembly of the oil baffle ring 1. The stopper fixture 4 is made of an elastic material, such as polytetrafluoroethylene or other similar elastic materials. The stopper fixture 4 and the inner hole of the gear shaft 2 need to be interference fit so as to fix the oil baffle ring 1 installed in the groove 3.

[0050] Following step S6, the process further includes step S7: installing the stopper fixture 4, which is then installed into the inner hole of the gear shaft 2, as shown below. Figure 5 As shown, the stopper fixture 4 includes a limiting part 41 and a force-applying part 42. The limiting part 41 abuts against the end face of the gear shaft 2, and the force-applying part 42 pushes the oil baffle ring 1 completely into the gear shaft groove 3 to fix the oil baffle ring 1 and press it tightly in the gear shaft groove 3, preventing the oil baffle ring 1 from loosening during the curing process of the adhesive, which can make the curing effect of the adhesive in subsequent steps better and the bonding stronger.

[0051] In one embodiment, the structure of the blocking tool 4 is as follows: Figure 4 As shown, one end of the force-applying part 42 has a chamfered structure 43, which facilitates the installation of the stopper fixture 4. (Reference) Figure 5 In the installed state, the limiting part 41 abuts against the end face of the gear shaft 2, limiting the stopper fixture 4 in the axial direction. At the same time, since the stopper fixture 4 and the inner hole of the gear shaft 2 are interference fit and made of elastic material, the force-applying part 42 abuts against the inner hole of the gear shaft 2 and applies a compressive force to the gear shaft groove 3 in the radial direction, which plays a role in pressing and fixing the oil baffle ring 1.

[0052] To further illustrate that the adhesive composition ratio and curing environment used in this embodiment can provide an adhesive with better bonding effect, Table 1 provides two comparative examples for comparison with this embodiment.

[0053] In the aforementioned embodiments, after the binder prepared by the resin and catalyst in a mass ratio of 100:33 is cured at room temperature for at least 24 hours or at 121°C to 149°C for at least 1 hour, the binder is evenly distributed between the oil baffle ring 1 and the gear shaft groove 3. Testing showed that the binder did not detach or wear after 9 hours of operation under atmospheric intake heating and pressurization conditions, and the oil baffle ring 1 did not detach during the disassembly of the gear shaft 2 and its assembled spline.

[0054] In the comparative examples, different component ratios and curing environments were used to prepare the binder. Atmospheric intake with heating and pressurization refers to environmental conditions where both temperature and pressure are significantly higher than normal. In Comparative Example 1, the binder prepared from a resin and catalyst at a mass ratio of 100:50 achieved a tensile shear strength of not less than 170 MPa in the strength test. However, after curing at room temperature for at least 24 hours or at 90°C for at least 1 hour, the binder exhibited uneven distribution between the oil baffle ring and the gear shaft groove, and detachment occurred after only one hour of testing.

[0055] For Comparative Example 2, the binder prepared from resin and catalyst at a mass ratio of 100:30 also exhibited a peel strength of not less than 1.96 KN / m in the strength test. However, after the binder with the mass ratio of Comparative Example 2 was cured at 60°C for 72 hours, the binder showed uneven distribution between the oil baffle ring and the gear shaft groove. Furthermore, during the disassembly of the gear shaft and its assembled spline after the test run, the oil baffle ring detached.

[0056] The comparison shows that the adhesive prepared by the scheme in this embodiment has higher strength and bonding effect, which can improve the bonding effect between the gear shaft groove 3 and the oil baffle ring 1, thereby improving the assembly quality of the oil baffle ring.

[0057]

[0058] Table 1: Examples and Comparative Cases of This Solution

[0059] Finally, perform step S9: Remove the stopper fixture 4. After the adhesive has cured, remove the stopper fixture 4 from the gear shaft 2. Inspect and protect the gear shaft 2. Visually inspect to confirm that the oil retainer ring 2 is correctly installed. Apply lubricating oil or protective oil to the gear shaft 2 for rust prevention and sealing. Note that both the lubricating oil and protective oil are toxic and flammable. Operators must wear personal protective equipment and use the equipment in a well-ventilated area.

[0060] The above-mentioned oil baffle assembly method, as an assembly process for oil baffles in an aero-engine transmission system, fully considers how to improve the adhesion between the gear shaft groove 3 and the oil baffle 1 at each stage, ensuring the normal operation of the oil baffle 1 while effectively avoiding damage to the gear shaft groove 3 and the oil baffle 1.

[0061] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for assembling an oil baffle ring, characterized in that, Includes the following steps: Provide the oil baffle ring to be assembled; An adhesive is provided, wherein the adhesive is a mixture of a first component and a second component, the first component being composed of epoxy resin and fluororubber compound, and the second component being a silane coupling agent, wherein the mass ratio of the first component to the second component is 100:33; The adhesive is applied to the oil baffle ring and the mounting groove, and then the oil baffle ring is pushed into the mounting groove; The assembled oil baffle ring and the mounting groove are placed in a curing environment for curing. The curing environment is for curing at room temperature for at least 24 hours, or at a temperature of 121°C to 149°C for at least 1 hour. The method is used for assembling an oil baffle ring in an aero-engine transmission system, the aero-engine transmission system including a gear shaft, and the mounting groove being a gear shaft groove disposed on the inner circumference of the gear shaft; the method further includes: A stopper fixture is provided, the stopper fixture being made of an elastic material and having an interference fit with the inner bore of the gear shaft; After pushing the oil baffle ring into the mounting groove, the stop plug fixture is installed into the inner hole of the gear shaft; During the curing process, the stopper tool presses the oil baffle ring tightly into the mounting groove; The stopper tool includes a limiting part and a force-applying part. The limiting part can abut against the end face of the gear shaft to restrict the movement of the stopper tool along the axial direction of the gear shaft. The force-applying part is interference-fitted with the inner hole of the gear shaft. During the curing process, the force-applying part presses the oil baffle ring tightly into the mounting groove.

2. The oil baffle ring assembly method as described in claim 1, characterized in that, Before providing the oil baffle ring to be assembled, the oil baffle ring assembly method further includes: Determine if this is the first time the oil retainer ring has been installed: If the judgment result is yes, then continue to the following steps: provide the oil baffle ring to be assembled; If the result is negative, proceed with the following steps: Remove the original oil baffle ring; Clean the grooves in the gear shaft; and Inspect the appearance of the groove on the gear shaft.

3. The oil baffle ring assembly method as described in claim 2, characterized in that, Cleaning the grooves of the gear shaft includes: The grooves of the gear shaft are cleaned using compressed gas with a pressure range of 276 kPa to 483 kPa. The gear shaft was cleaned by dry jet grinding.

4. The oil baffle ring assembly method as described in claim 1, characterized in that, When the oil baffle ring is pushed into the mounting groove, it is pushed in radially along the gear shaft.

5. The oil baffle ring assembly method as described in claim 1, characterized in that, The oil baffle ring to be assembled includes: The surface of the oil baffle ring is polished to give it a roughness.

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