Gyroscope bearing assembly fixture and assembly method

Abstract

This invention pertains to gyroscope assembly technology and relates to improvements in gyroscope bearing assembly fixtures and methods. The fixture includes a base [1] and a spindle [2], characterized by an electromagnetic vibration leveling mechanism consisting of a lower electromagnet [12], an upper electromagnet [13], a clamping sleeve [14], and a clamping nut [15]. The assembly steps are: assembly; vibration leveling; curing and drying; and adjustment of preload. This invention ensures the assembly accuracy of the bearing.

Description

Technical Field

[0001] This invention pertains to gyroscope assembly technology and relates to improvements in gyroscope bearing assembly fixtures and assembly methods. Background Technology

[0002] Flexible gyroscope motors are one of the core components of gyroscopes, and bearings are a key component of the motor, whose performance and lifespan directly affect the performance and lifespan of the gyroscope. Correctly selecting the bearing preload and loading method can improve the support stiffness, increase rotational accuracy, reduce vibration and noise, reduce friction and heat generation, and extend lifespan. There are generally three methods for loading bearings: nut loading, weight loading, and bushing loading. However, the first two methods cannot guarantee the correct loading amount, resulting in poor bearing assembly accuracy; the last method requires highly skilled assembly personnel, is complex, and has a long assembly cycle. A certain type of flexible gyroscope motor requires very high bearing assembly accuracy, requiring the runout of the bearing end face to be less than 6μm. The assembly fixtures and assembly status of a domestic unit are as follows... Figure 1 As shown, it includes a base 1 and a spindle 2 vertically mounted on the base 1. The end of the gyroscope shaft 4 with the inner bearing ring is fitted downwards onto the spindle 2, with the lower end face of the gyroscope shaft 4 located on the upper surface of the base 1. The lower bearing outer ring 3 and the cage ball assembly are placed on the lower bearing inner ring of the gyroscope shaft 4. A spring 5 is fitted onto the spindle 2, with its lower end face fitting against the upper end face of the lower bearing outer ring 3. The upper bearing inner ring 7, the cage ball assembly, and the upper bearing outer ring 6 are fitted onto the gyroscope shaft 4, with the lower end face of the upper bearing inner ring 7 positioned by a boss on the gyroscope shaft 4. The lower end face of the upper bearing outer ring 6 fits against the upper end face of the spring 5. Adhesive is applied between the mating surfaces of the upper bearing inner ring 7 and the gyroscope shaft 4. Adhesive is applied to the corresponding positions at both ends of the outer casing 17 where it mates with the outer ring 3 of the lower bearing and the outer ring 6 of the upper bearing. The outer casing 17 is then fitted over the assembled gyroscope shaft and bearings. A pressure plate 10 with a center hole is fitted onto the gyroscope shaft 4, with its lower end face mates with the upper end face of the gyroscope shaft 4 and the outer ring 6 of the upper bearing. The pressure plate 10 and the base 1 are connected by a double-ended screw 11. A pressure sleeve 8 is fitted onto the spindle 2, with its lower end face mates with the upper end face of the inner ring 7 of the upper bearing. A weight 9 of rated weight is added to the upper surface of the pressure sleeve 8. The assembled fixture is then placed in an oven for drying, completing the bearing assembly. The disadvantage of existing assembly fixtures and methods is that the runout of the bearing end face after assembly is difficult to meet the requirement of 6μm, thus failing to guarantee the bearing assembly accuracy. Summary of the Invention

[0003] The purpose of this invention is to provide a gyroscope bearing assembly fixture and assembly method that can ensure bearing assembly accuracy.

[0004] The technical solution of this invention is: a gyroscope bearing assembly fixture, comprising a base 1 and a spindle 2 vertically mounted on the base 1, characterized in that it has an electromagnetic vibration leveling mechanism composed of a lower electromagnet 12, an upper electromagnet 13, a clamping sleeve 14, and a clamping nut 15. A circular groove is located on the base 1, and the lower electromagnet 12, with a central hole, is installed in this groove, with its upper surface perpendicular to the axis of its central hole. The lower end of the spindle 2 is inserted into the central hole of the lower electromagnet 12. The upper electromagnet 13, with its central hole... The upper electromagnet 13 is fitted onto the spindle 2 and maintains a sliding fit, with its lower surface perpendicular to the axis of its central hole; the clamping sleeve 14 is fitted onto the spindle 2 and maintains a sliding fit with the spindle 2; the upper end of the spindle 2 has an external thread, and the clamping nut 15 is screwed onto the external thread; after the assembled gyroscope shaft 4 is fitted onto the spindle 2, the lower end face of the outer ring of the lower bearing connected to the gyroscope shaft 4 presses against the upper surface of the lower electromagnet 12, and the lower end face of the clamping sleeve 14 presses against the upper end face of the gyroscope shaft 4, with the clamping sleeve 14 located inside the central hole of the upper electromagnet 13.

[0005] The method for assembling a gyroscope bearing using the assembly fixture described above is characterized by the following assembly steps:

[0006] 1. Assembly;

[0007] 1.1 Assemble the fixture; Place the base 1 on the workbench, place the lower electromagnet 12 into the groove on the base 1, and insert the lower end of the spindle 2 into the center hole of the electromagnet 12.

[0008] 1.2 Assemble the gyroscope shaft and bearings; Place the end of the gyroscope shaft 4 with the inner bearing ring downwards onto the spindle 2, with the lower end face of the gyroscope shaft 4 located on the upper surface of the electromagnet 12. Place the lower bearing outer ring 3 and the cage ball assembly onto the inner bearing ring at the lower end of the gyroscope shaft 4. Place the spring 5 onto the spindle 2, with the lower end face of the spring 5 fitting against the upper end face of the lower bearing outer ring 3. Place the upper bearing inner ring 7, the cage ball assembly, and the upper bearing outer ring 6 onto the gyroscope shaft 4. The lower end face of the upper bearing inner ring 7 is positioned by the boss on the gyroscope shaft 4, and the lower end face of the upper bearing outer ring 6 fits against the upper end face of the spring 5. Press and position the upper bearing inner ring 7 by using the nut 16 and the thread at the upper end of the gyroscope shaft 4.

[0009] 1.3 Assemble the outer shell 17 and the upper electromagnet 13; first, apply adhesive to the corresponding positions at both ends of the outer shell 17 where it fits against the outer ring 3 of the lower bearing and the outer ring 6 of the upper bearing of the gyroscope; then, put the outer shell 17 over the assembled gyroscope shaft and bearings; put the upper electromagnet 13 on the spindle 2, with the lower end face of the upper electromagnet 13 fitting against the upper end face of the outer ring 6 of the upper bearing of the gyroscope; put the clamping sleeve 14 on the spindle 2, with the lower end face of the clamping sleeve 14 fitting against the upper end face of the gyroscope shaft 4; screw the clamping nut 15 onto the thread at the upper end of the spindle 2, and press the upper end face of the gyroscope shaft 4 tightly through the clamping sleeve 14;

[0010] 2. Vibration leveling: Place the assembled fixture in an oven, heat it to 80±5℃ and keep it warm. At the same time, turn on the power supply of the lower electromagnet 12 and the upper electromagnet 13 to perform vibration leveling. The power supply is 10~15V, 50Hz, and the vibration time is 2~3 hours.

[0011] 3. Curing and drying: Disconnect the power to the lower electromagnet 12 and the upper electromagnet 13, raise the oven temperature to 120±5℃, keep it at that temperature for 3 to 4 hours, and then cool it to room temperature;

[0012] 4. Adjust the preload: Remove the fixture from the oven, remove the clamping nut 15, take out the assembled workpiece, loosen the nut 17 first, and then tighten the nut 17 with a torque wrench. Adjust the preload to 0.8-1.2 kg.

[0013] The advantages of this invention are: it ensures the assembly accuracy of the flexible gyroscope motor bearing. After inspection, the runout of the bearing end face of the flexible gyroscope motor bearing assembled using the fixture and method of this invention is only 1 to 3 μm. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the existing assembly fixtures and assembly status.

[0015] Figure 2 This is a schematic diagram of the assembly fixture and assembly state of the present invention. Detailed Implementation

[0016] The present invention will now be described in further detail. See below. Figure 2The gyroscope bearing assembly fixture of the present invention includes a base 1 and a mandrel 2 vertically mounted on the base 1. Its characteristic feature is an electromagnetic vibration leveling mechanism consisting of a lower electromagnet 12, an upper electromagnet 13, a clamping sleeve 14, and a clamping nut 15. A circular groove is located on the base 1, and the lower electromagnet 12, with a central hole, is installed in this groove. The upper surface of the lower electromagnet 12 is perpendicular to the axis of its central hole. The lower end of the mandrel 2 is inserted into the central hole of the lower electromagnet 12 and maintains a sliding fit. The upper electromagnet 13, with a central hole, is mounted in this groove. Magnet 13 is fitted onto spindle 2, and the lower surface of upper electromagnet 13 is perpendicular to the axis of its central hole; clamping sleeve 14 is fitted onto spindle 2 and maintains a sliding fit with spindle 2; the upper end of spindle 2 has external threads, and clamping nut 15 is screwed onto these external threads; after the assembled gyroscope shaft 4 is fitted onto spindle 2, the lower end face of the outer ring of the lower bearing connected to gyroscope shaft 4 presses against the upper surface of lower electromagnet 12, and the lower end face of clamping sleeve 14 presses against the upper end face of gyroscope shaft 4, with clamping sleeve 14 located inside the central hole of upper electromagnet 13.

[0017] The method for assembling a gyroscope bearing using the assembly fixture described above is characterized by the following assembly steps:

[0018] 1. Assembly;

[0019] 1.1 Assemble the fixture; Place the base 1 on the workbench, place the lower electromagnet 12 into the groove on the base 1, and insert the lower end of the spindle 2 into the center hole of the electromagnet 12.

[0020] 1.2 Assemble the gyroscope shaft and bearings; Place the end of the gyroscope shaft 4 with the inner bearing ring downwards onto the spindle 2, with the lower end face of the gyroscope shaft 4 located on the upper surface of the electromagnet 12. Place the lower bearing outer ring 3 and the cage ball assembly onto the inner bearing ring at the lower end of the gyroscope shaft 4. Place the spring 5 onto the spindle 2, with the lower end face of the spring 5 fitting against the upper end face of the lower bearing outer ring 3. Place the upper bearing inner ring 7, the cage ball assembly, and the upper bearing outer ring 6 onto the gyroscope shaft 4. The lower end face of the upper bearing inner ring 7 is positioned by the boss on the gyroscope shaft 4, and the lower end face of the upper bearing outer ring 6 fits against the upper end face of the spring 5. Press and position the upper bearing inner ring 7 by using the nut 16 and the thread at the upper end of the gyroscope shaft 4.

[0021] 1.3 Assemble the outer shell 17 and the upper electromagnet 13; first, apply adhesive to the corresponding positions at both ends of the outer shell 17 where it fits against the outer ring 3 of the lower bearing and the outer ring 6 of the upper bearing of the gyroscope; then, put the outer shell 17 over the assembled gyroscope shaft and bearings; put the upper electromagnet 13 on the spindle 2, with the lower end face of the upper electromagnet 13 fitting against the upper end face of the outer ring 6 of the upper bearing of the gyroscope; put the clamping sleeve 14 on the spindle 2, with the lower end face of the clamping sleeve 14 fitting against the upper end face of the gyroscope shaft 4; screw the clamping nut 15 onto the thread at the upper end of the spindle 2, and press the upper end face of the gyroscope shaft 4 tightly through the clamping sleeve 14;

[0022] 2. Vibration leveling: Place the assembled fixture in an oven, heat it to 80±5℃ and keep it warm. At the same time, turn on the power supply of the lower electromagnet 12 and the upper electromagnet 13 to perform vibration leveling. The power supply is 10~15V, 50Hz, and the vibration time is 2~3 hours.

[0023] 3. Curing and drying: Disconnect the power to the lower electromagnet 12 and the upper electromagnet 13, raise the oven temperature to 120±5℃, keep it at that temperature for 3 to 4 hours, and then cool it to room temperature;

[0024] 4. Adjust the preload: Remove the fixture from the oven, remove the clamping nut 15, take out the assembled workpiece, loosen the nut 17 first, and then tighten the nut 17 with a torque wrench. Adjust the preload to 0.8-1.2 kg.

[0025] Example:

[0026] Example 1: First, assemble the parts. Then, vibrate and level them; raise the oven temperature to 80℃, vibrate for 3 hours at 10V. Curing and drying: turn off the power, raise the oven temperature to 120℃, hold for 3.5 hours, and then cool to room temperature. Adjust the preload: remove the fixture from the oven, remove the clamping nut 15, take out the assembled workpiece, loosen nut 17 first, then tighten nut 17 using a torque wrench, adjusting the preload to 1Kg.

[0027] Example 2: First, assemble the parts. Then, vibrate and level them; raise the oven temperature to 78℃, vibrate for 2.5 hours, and use 12V. Curing and drying: turn off the power, raise the oven temperature to 125℃, maintain this temperature for 3 hours, and then cool to room temperature. Adjust the preload: remove the fixture from the oven, remove the clamping nut 15, take out the assembled workpiece, loosen the nut 17 first, then tighten the nut 17 using a torque wrench, adjusting the preload to 1.2Kg.

[0028] Example 3: First, assemble the parts. Then, vibrate and level them; raise the oven temperature to 85℃, vibrate for 2 hours at 15V. Curing and drying: turn off the power, raise the oven temperature to 115℃, maintain this temperature for 4 hours, and then cool to room temperature. Adjust the preload: remove the fixture from the oven, remove the clamping nut 15, take out the assembled workpiece, loosen nut 17 first, then tighten nut 17 using a torque wrench, adjusting the preload to 0.9Kg.

Claims

1. A gyroscope bearing assembly fixture, comprising a base [1] and a spindle [2] vertically mounted on the base [1], characterized in that, An electromagnetic vibration leveling mechanism is provided, consisting of a lower electromagnet [12], an upper electromagnet [13], a clamping sleeve [14], and a clamping nut [15]. A circular groove is located on the base [1]. The lower electromagnet [12] with a central hole is installed in this groove, with its upper surface perpendicular to the axis of its central hole. The lower end of the spindle [2] is inserted into the central hole of the lower electromagnet [12]. The upper electromagnet [13] with a central hole is fitted onto the spindle [2] and maintains a sliding fit, with its lower surface perpendicular to the axis of its central hole. The axis of the center hole is perpendicular; the clamping sleeve [14] is fitted on the spindle [2] and maintains a sliding fit with the spindle [2]; the upper end of the spindle [2] has an external thread, and the clamping nut [15] is screwed on the external thread; after the assembled gyroscope shaft [4] is fitted on the spindle [2], the lower end face of the outer ring of the lower bearing connected to the gyroscope shaft [4] presses against the upper surface of the lower electromagnet [12], the lower end face of the clamping sleeve [14] presses against the upper end face of the gyroscope shaft [4], and the clamping sleeve [14] is located in the center hole of the upper electromagnet [13].

2. The method for assembling a gyroscope bearing using the assembly fixture as described in claim 1, characterized in that the assembly steps are as follows: 2.1 Assembly; 2.1.1 Assemble the fixture; Place the base [1] on the workbench, place the lower electromagnet [12] into the groove on the base [1], and insert the lower end of the spindle [2] into the center hole of the electromagnet [12]; 2.1.2 Assemble the gyroscope shaft and bearing; place the end of the gyroscope shaft [4] with the inner bearing ring downwards onto the spindle [2], with the lower end face of the gyroscope shaft [4] located on the upper surface of the electromagnet [12]. Place the lower bearing outer ring [3] and the cage ball assembly onto the inner bearing ring at the lower end of the gyroscope shaft [4]. Place the spring [5] onto the spindle [2], with the lower end face of the spring [5] aligned with the lower bearing outer ring of the gyroscope. The upper end face of the gyroscope bearing inner ring [7], the cage ball assembly and the gyroscope bearing outer ring [6] are fitted onto the gyroscope shaft [4]. The lower end face of the gyroscope bearing inner ring [7] is positioned by the boss on the gyroscope shaft [4]. The lower end face of the gyroscope bearing outer ring [6] is fitted with the upper end face of the spring [5]. The gyroscope bearing inner ring [7] is pressed and positioned by the nut [16] and the thread on the upper end of the gyroscope shaft [4]. 2.1.3 Assemble the outer shell [17] and the upper electromagnet [13]; first, apply adhesive to the corresponding positions at both ends of the outer shell [17] where it fits against the outer ring of the lower bearing [3] and the outer ring of the upper bearing [6] of the gyroscope, and then put the outer shell [17] over the assembled gyroscope shaft and bearing; put the upper electromagnet [13] on the spindle [2], with the lower end face of the upper electromagnet [13] fitting against the upper end face of the outer ring of the upper bearing [6] of the gyroscope; put the clamping sleeve [14] on the spindle [2], with the lower end face of the clamping sleeve [14] fitting against the upper end face of the gyroscope shaft [4], and screw the clamping nut [15] onto the thread at the upper end of the spindle [2], and press the upper end face of the gyroscope shaft [4] with the clamping sleeve [14]; 2.2 Vibration leveling; Place the assembled fixture in an oven, heat it to 80±5℃ and keep it warm, and at the same time turn on the power supply of the lower electromagnet[12] and the upper electromagnet[13] for vibration leveling. The power supply is 10~15V, 50Hz, and the vibration time is 2~3 hours. 2.3 Curing and drying: Disconnect the lower electromagnet [12] and the upper electromagnet [13], raise the oven temperature to 120±5℃, keep it warm for 3 to 4 hours, and then cool it to room temperature; 2.4 Adjust the preload; take the fixture out of the oven, remove the clamping nut[15], take out the assembled workpiece, loosen the nut first[17], and then tighten the nut with a constant force wrench[17], and adjust the preload to 0.8~1.2Kg.

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