Aero-engine main fuel pump regulator ball bearing inner ring repairing and grinding device and method

Abstract

The invention relates to an aero-engine main fuel pump regulator ball bearing inner ring repairing and grinding device and method, and solves the problems existing during bearing inner ring grinding. The device comprises a cover and a base, internal threads of the cover are matched with external threads of the base, after the cover and the base are in threaded connection, a cavity for containing a bearing is formed, planar annular bosses capable of pressing an inner ring of the bearing are arranged in the cavity, the cover and the base, and the diameter of a center hole of each planar annular boss is equal to or larger than that of an inner hole of the bearing. The centers of the cover and the base are respectively provided with a through hole communicated with the center hole of the plane annular boss, and a grinding tool enters and exits through the through holes. The method comprises the following steps: mounting the bearing into the base, mounting the cover of the device on the base, tightening, coating the inner ring of the bearing with a grinding agent from one end of the base with the inner cone during grinding, selecting a proper grinding appliance for grinding, and after grinding is finished, entering a cleaning agent from the inner cone and downwards and vertically washing. By using the device and the method disclosed by the invention, the production process is improved, the production cost is reduced, and the benefit is improved.

Description

Technical Field

[0001] The present invention relates to the field of aircraft engine parts repair, in particular to a device and method for repairing and grinding a ball bearing of a pendulum valve of a main fuel pump regulator of an aircraft engine. Background Art

[0002] The main fuel pump regulator is a core control accessory for aircraft engines, primarily used to reliably control the engine at varying altitudes, speeds, atmospheric temperatures, and pressures, ensuring stable operation under all conditions. As a highly sophisticated mechanical and hydraulic control accessory, the main fuel pump regulator has a complex internal structure and requires extremely high levels of coordination and interoperability between its components. A defect in any component can significantly impact the control and stable operation of the entire engine. For example, the bearing fit parameters of the main fuel pump regulator's pendulum valve assembly are crucial to the engine's responsiveness to the throttle lever, impacting aircraft performance and flight safety.

[0003] The pendulum valve (single pendulum) assembly consists of Figure 1 As shown, the double pendulum has similar components. Both bearings have clearance requirements with the pendulum bracket and shaft, while the shaft also has clearance requirements with the pendulum fork valve. During repair, bearings must be selected based on the pendulum bracket dimensions, ensuring that the bearing outer diameters meet the clearance requirements for the corresponding pendulum bracket bore inner diameters. The bearing inner bores are then ground to ensure the difference in inner diameter between the two bearings is within 0.001mm. The shaft and pendulum fork valve are then selected and ground as necessary to meet the clearance requirements.

[0004] The requirements for bearing inner ring grinding are as follows:

[0005] 1. The inner ring of the bearing must be fixed and the bearing cannot roll, otherwise the grinding cannot apply the extrusion force;

[0006] 2. The inner ring of the bearing must be completely sealed and fit perfectly with the device to prevent the abrasive from being squeezed into the bearing and affecting the bearing balls;

[0007] 3. The grinding device and the inner ring of the bearing must be concentric to eliminate eccentric wear factors;

[0008] 4. The grinding device should protect the outer ring and balls from contamination.

[0009] 5. Cleaning of bearings after grinding should be easy to operate to prevent secondary contamination. Summary of the Invention

[0010] The present invention solves the problems existing in the grinding of the inner ring of the bearing by providing a device and a method for grinding the inner ring of the ball bearing of the main fuel pump regulator of an aircraft engine.

[0011] The present invention is achieved through the following technical solutions:

[0012] A device for lapping the inner ring of a ball bearing of a main fuel pump regulator of an aeroengine, comprising a lid and a base. The internal thread of the lid is matched with the external thread of the base. After the two are threadedly connected, a cavity for accommodating the bearing is formed. Inside the cavity, both the lid and the base have flat annular bosses that can press the inner ring of the bearing. The diameter of the central hole of the flat annular boss is equal to or larger than the inner hole of the bearing. Through holes communicating with the central hole of the flat annular boss for the grinding tool to enter and exit are provided at the centers of both the lid and the base.

[0013] Furthermore, the diameter and thickness of the annular boss are equal to those of the inner ring of the bearing.

[0014] Furthermore, the holes of the lid and the base away from the cavity for accommodating the bearing are internal taper holes.

[0015] Furthermore, the taper of the internal taper hole is 90°.

[0016] Furthermore, the outer walls of the lid and the base have knurling for easy tightening and loosening.

[0017] The method for lapping the inner ring of a ball bearing of a main fuel pump regulator of an aeroengine is as follows: The small end of the outer ring of the bearing is loaded into the base with the device base facing. Ensure that the inner ring of the bearing is in contact with the inner end face of the device base. Install the device lid on the base and tighten it. When lapping, apply the lapping agent from the end with the internal taper of the base to the inner ring of the bearing. Select a suitable grinding tool for lapping. After lapping, the cleaning agent enters from the internal taper and flushes vertically downward. After cleaning, repeatedly wipe with a white silk cloth until the silk cloth no longer changes color. Take out the bearing, check and clean the residues with the help of a magnifying glass. After measuring that the inner diameter size of the bearing is qualified, perform ultrasonic cleaning.

[0018] Using the device and method of the present invention to lap the inner ring of the bearing can ensure that all technical parameters of the bearing meet the requirements of the drawings, process and use. The use of this device and method improves the production process, reduces the production cost and improves the enterprise benefit. Description of the Drawings

[0019] Figure 1 It is composed of parts of the pendulum valve (single pendulum) assembly;

[0020] Figure 2 It is the external view of the device of the present invention. Among them, Figure a is the lid and Figure b is the base;

[0021] Figure 3 It is the structural diagram of the device of the present invention. Among them, Figure a is the lid and Figure b is the base;

[0022] Figure 4 It is the exploded view of the device of the present invention;

[0023] Figure 5 It is the assembly drawing of the device of the present invention;

[0024] Figure 6 It is a schematic diagram of the use of the device of the present invention. Specific embodiments

[0025] The present invention is a device and method for lapping the inner ring of a ball bearing of a main fuel pump regulator of an aeroengine. By fixing the inner and outer steel rings of the bearing, the bearing is wrapped, and the position of the central hole is a through hole. The specific technical solutions are as follows:

[0026] (1) Design a protection device for fixing the outer steel ring of the bearing. The device consists of a base and a cover, which are connected by a threaded connection. The device is used to wrap the outer steel sleeve, balls, and inner steel ring of the bearing in an all-size and integral manner. The outer surface of the protective cover is designed with knurling.

[0027] (2) Design the fixed end face of the inner steel ring. The end face is an annular structure, and its diameter and the width of the annular belt correspond to the inner ring of the bearing. When the assembly is completed, the distance between the end faces is less than 0.5 mm of the length of the inner steel sleeve of the bearing, and the two end faces are completely parallel.

[0028] (3) Inner cone design. The fixed part of the inner steel ring extends outward as an inner cone design for flushing and scrubbing.

[0029] Such as Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 As shown, the whole device consists of two parts: a cover A and a base A. The cover and the base are connected by a threaded connection. The bearing parts to be lapped are placed in the middle cavity. The device and the bearing parts adopt end face sealing. The end faces of the inner holes of the cover and the base of the device are in contact with the end face of the inner ring of the part bearing. The cover and the base are tightened by threads for sealing.

[0030] Such as Figure 6 As shown, the method for lapping the inner hole of the bearing is as follows: The small end of the outer ring of the bearing is loaded into the base with the small end facing the base of the device, ensuring that the inner ring of the bearing is in contact with the inner end face of the base of the device. Then the cover of the device is installed on the base and tightened. When lapping, the lapping agent is applied to the inner ring of the bearing from the end with the inner cone of the base, and a suitable lapping tool is selected for lapping. After lapping, the cleaning agent enters from the inner cone and flushes vertically downward. After cleaning, it is repeatedly scrubbed with a white silk cloth until the silk cloth no longer changes color. Then the bearing is taken out, and the residues are inspected and cleaned with the aid of a magnifying glass. After measuring that the inner diameter size of the bearing is qualified, ultrasonic cleaning is carried out.

[0031] The object of the present invention is that due to the flexible rolling property of the bearing itself, when the inner diameter of the bearing needs to be enlarged, three conditions must be simultaneously met: the inner diameter of the bearing is enlarged, the inside of the bearing cannot be contaminated during the grinding process, and the inner ring of the bearing cannot be eccentrically ground. The present invention provides a device and method for grinding the inner diameter of the bearing of the main fuel pump regulator of an aeroengine. By using this device and method to repair the inner diameter of the bearing, it can be ensured that the finished bearing does not need to be returned to the factory for replacement, but only needs to be processed according to specific requirements, and the operation is convenient and fast. The processing accuracy reaches the micron level, meeting the requirements of precision assembly for aeroengine repair, greatly shortening the overall engine repair cycle, reducing the failure rate and procurement cost, and improving the enterprise efficiency.

Claims

1. A device for lapping the inner ring of a ball bearing of a main fuel pump regulator of an aeroengine, characterized in that: It includes a lid and a base. The internal thread of the lid mates with the external thread of the base. After the two are threadedly connected, a cavity for accommodating a bearing is formed. Inside the cavity, both the lid and the base have flat annular bosses that can press against the inner ring of the bearing. The diameter of the central hole of the flat annular boss is equal to or greater than the inner hole of the bearing. Through holes that communicate with the central hole of the flat annular boss and are for the grinding tool to enter and exit are provided at the centers of both the lid and the base.

2. The inner ring lapping device for the ball bearing of the main fuel pump regulator of an aeroengine according to claim 1, characterized in that: The diameter and thickness of the said annular boss are equal to those of the inner ring of the bearing.

3. A device for lapping the inner ring of a ball bearing of a main fuel pump regulator of an aeroengine according to claim 1, characterized in that: The holes of the lid and the base that are away from the cavity for accommodating the bearing are internal taper holes.

4. A lapping device for the inner ring of a ball bearing of a main fuel pump regulator of an aeroengine according to claim 3, characterized in that: The taper of the said internal taper hole is 90°.

5. A device for lapping the inner ring of a ball bearing of a main fuel pump regulator of an aeroengine according to claim 1, characterized in that: The outer walls of the lid and the base have knurling for easy tightening and loosening.

6. A method for lapping the inner ring of a ball bearing of a main fuel pump regulator of an aeroengine, characterized in that, When using the grinding device according to any one of claims 1 - 5, the method is as follows: The small end of the outer ring of the bearing is loaded into the base with the bearing facing the base, ensuring that the inner ring of the bearing fits against the inner end face of the base of the device. Then the lid of the device is installed on the base and tightened. When grinding, grinding agent is applied to the inner ring of the bearing from the end of the base with the internal taper. A suitable grinding tool is selected for grinding. After grinding, the cleaning agent enters from the internal taper and flushes vertically downward. After cleaning, it is repeatedly wiped with a white silk cloth until the silk cloth no longer changes color. Then the bearing is taken out, and the residues are inspected and cleaned with the aid of a magnifying glass. After the inner diameter dimension of the bearing is measured to be qualified, ultrasonic cleaning is carried out.

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