A high-speed rotor shafting structure

Abstract

A high-speed rotor shaft structure comprises a rotor, radial foil bearings, thrust foil bearings, support end covers, a shell and clutch bearing assemblies, the rotor is connected with the support end covers through the radial foil bearings, the thrust foil bearings and the clutch bearing assemblies, and the rotor is provided with radial foil bearing mounting shaft sections, thrust foil bearing mounting grooves and clutch bearing assembly mounting seats at both ends; the support end covers are provided with radial foil bearing mounting holes, thrust foil bearing mounting end faces and clutch bearing assembly mounting shaft sections. The application can be used for high-speed motor rotors or aviation high-speed shafts, and is supported by ball bearings at low speed and supported by foil bearings at high speed, so that starting is stable, friction is not generated at high speed, heat generation is reduced, lubrication system requirements are lowered, and environmental pollution is reduced; the application is used in frequent start-stop occasions, reduces friction heat generation and coating wear of the foil bearings, and prolongs service life.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical transmission, and particularly relates to a high-speed rotor shaft structure. BACKGROUND

[0002] The high-speed rotor shaft is an important component of the mechatronic transmission system, and is mainly applied to fields with high-speed requirements such as high-speed motors, electric spindles and aviation shafts. The conventional high-speed shaft is usually supported by pairs of angular contact ceramic ball bearings, lubricated by oil mist or oil gas, and cooled by circulating cooling water. When the conventional ball bearing is at high speed, the heat generation increases sharply, and if the bearing is not properly selected, the bearing will be severely worn and even stuck and burned. Due to the high temperature rise, the bearing needs to be made of high-temperature bearing steel, and the bearing also needs to have high precision. In addition, the oil mist lubrication will also cause pollution to the working environment. SUMMARY

[0003] In order to overcome the above shortcomings, the application provides a high-speed rotor shaft structure.

[0004] In order to achieve the above purpose, the application adopts the following technical scheme:

[0005] A high-speed rotor shaft structure, comprising a rotor, a radial foil bearing, a thrust foil bearing, a support end cover, a shell and a clutch bearing assembly, the two ends of the rotor are connected with the support end cover through the radial foil bearing, the thrust foil bearing and the clutch bearing assembly respectively, and the two ends of the rotor are each provided with a radial foil bearing mounting shaft section, a thrust foil bearing mounting groove and a clutch bearing assembly mounting seat;

[0006] The support end cover is provided with a radial foil bearing mounting hole, a thrust foil bearing mounting end face and a clutch bearing assembly mounting shaft section, the radial foil bearing is arranged between the radial foil bearing mounting hole and the radial foil bearing mounting shaft section of the rotor, the thrust foil bearing is arranged between the thrust foil bearing mounting groove and the thrust foil bearing mounting end face, and the clutch bearing assembly is arranged between the clutch bearing assembly mounting seat and the clutch bearing assembly mounting shaft section;

[0007] The clutch bearing assembly comprises an inner ring, a rolling body, a middle ring, a clutch wedge-shaped element, a retainer, an outer ring and a spring, the inner ring and the outer ring are provided with bearing grooves, the rolling body is mounted between the bearing grooves and cooperates with the inner ring and the middle ring to realize bearing support, the wedge-shaped element is mounted between the middle ring and the outer ring, the clutch wedge-shaped elements are uniformly distributed on the circumference of the retainer, the spring is a spiral spring, the spring is mounted in the spring groove arranged at both ends of the clutch wedge-shaped element, and the spring maintains the initial contact state of the clutch wedge-shaped element with the middle ring and the outer ring and provides a reset elastic force.

[0008] Further optimized, the middle ring and the outer ring are provided with ribs for limiting the axial displacement of the clutch wedge element.

[0009] Further optimized, the clutch wedge element has a centrifugal disengagement function, and the clutch wedge element will disengage from the middle ring after the rotational speed of the rotor shaft system exceeds the set rotational speed.

[0010] The beneficial effects of the present invention are:

[0011] 1. The present invention can be used for high-speed motor rotors or aviation high-speed shaft systems. At low speeds, it is supported by ball bearings, and at high speeds, it is supported by foil bearings, achieving smooth starting, no friction at high speeds, reducing heat generation, lowering lubrication system requirements, and reducing environmental pollution.

[0012] 2. The present invention is used to reduce frictional heating and coating wear of foil bearings in situations where the vehicle is frequently started and stopped, thereby extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the high-speed rotor shafting structure;

[0014] Figure 2 is a schematic diagram of the rotor structure;

[0015] Figure 3 Schematic diagram of the supporting end cover structure;

[0016] Figure 4 It is a schematic diagram of the clutch bearing assembly structure;

[0017] Figure 5 Schematic diagram of the clutch wedge element structure;

[0018] Figure 6 Schematic diagram of the cage structure;

[0019] In the figure: 1. rotor, 101. radial foil bearing mounting shaft section, 102. thrust foil bearing mounting groove, 103. clutch bearing mounting seat, 104. elastic retaining ring groove, 2. radial foil bearing, 3. foil thrust bearing, 4. support end cover, 401. radial foil bearing mounting hole, 402. thrust foil bearing mounting end face, 403. clutch bearing mounting shaft section, 5. housing, 6. clutch bearing assembly, 601. inner ring, 602. rolling element, 603. middle ring, 604. clutch wedge element, 605. retaining frame, 606. outer ring, 607. spring, 7. elastic retaining ring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings of the present invention.

[0021] A high-speed rotor shafting structure includes a rotor 1, a radial foil bearing 2, a thrust foil bearing 3, a support end cover 4, a housing 5 and a clutch bearing assembly 6.

[0022] The two ends of the rotor 1 are connected to the support end cover 4 through the radial foil bearing 2, the thrust foil bearing 3 and the clutch bearing assembly 6. Both ends of the rotor 1 are provided with a radial foil bearing mounting shaft section 101, a thrust foil bearing mounting groove 102 and a clutch bearing assembly mounting seat 103.

[0023] The support end cover 4 is provided with a radial foil bearing mounting hole 401, a thrust foil bearing mounting end face 402 and a clutch bearing assembly mounting shaft section 403; the radial foil bearing 2 is arranged between the rotor radial foil bearing mounting shaft section 101 and the radial foil bearing mounting hole 401; the thrust foil bearing 3 is arranged between the thrust foil bearing mounting groove 102 and the thrust foil bearing mounting end face 402; and the clutch bearing assembly 6 is arranged between the clutch bearing assembly mounting seat 103 and the clutch bearing assembly mounting shaft section 403.

[0024] The clutch bearing assembly 6 includes an inner ring 601, rolling elements 602, a middle ring 603, a clutch wedge element 604, a retaining frame 605, an outer ring 606, and a spring 607. The inner ring 601 and the middle ring 603 are provided with bearing channels. The rolling elements 602 are installed between the bearing channels and cooperate with the inner ring 601 and the middle ring 603 to achieve bearing support. The outer diameter of the middle ring 603 serves as the inner raceway of the clutch, and the inner diameter of the outer ring 606 serves as the outer raceway of the clutch. The middle ring 603 and the outer ring 606 are provided with ribs to limit the axial displacement of the clutch wedge element 604. The clutch wedge element 604 has a centrifugal disengagement function. When the speed of the rotor shaft system exceeds the set speed, the clutch wedge element 604 will disengage from the middle ring 603. The spring 607 is a coil spring, which is installed in the spring grooves provided at both ends of the clutch wedge element 604 to maintain the initial contact state of the clutch wedge element 604 with the middle ring 603 and the outer ring 606, and provide a reset elastic force. The retaining frame 605 is a squirrel cage retaining frame, and the clutch wedge elements 604 are evenly distributed on the circumference of the retaining frame 605 to ensure uniform stress distribution.

[0025] Working principle: when starting at low speed, the clutch bearing assembly 6 is in the wedged state, at this time the rotor is supported by the clutch bearing assembly 6, the radial foil bearing 2 and the thrust foil bearing 3 are not in contact with the rotor 1, and the rotor 1 is started stably; when the rotor 1 reaches the set speed, the clutch wedge element 604 of the clutch bearing is centrifugally separated from the middle ring 603 under the action of centrifugal force, at this time the clutch bearing assembly 6 will no longer provide support, at the same time, the radial foil bearing 2 and the thrust foil bearing 3 have generated sufficient gas film due to the action of high speed, and the rotor 1 can stably run at high speed; due to the characteristics of the radial foil bearing 2, at this time the rotor shaft system can break through the limit speed of the traditional bearing support to achieve higher speed, and does not need to be lubricated.

[0026] The main features, use method, basic principles and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, the present application can be variously changed and improved according to the actual situation, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A high-speed rotor shafting structure, characterized in that: The invention comprises a rotor (1), a radial foil bearing (2), a thrust foil bearing (3), a support end cover (4), a housing (5) and a clutch bearing assembly (6), wherein both ends of the rotor (1) are connected to the support end cover (4) via the radial foil bearing (2), the thrust foil bearing (3) and the clutch bearing assembly (6), and both ends of the rotor (1) are provided with a radial foil bearing mounting shaft section (101), a thrust foil bearing mounting groove (102) and a clutch bearing assembly mounting seat (103); The support end cover (4) is provided with a radial foil bearing mounting hole (401), a thrust foil bearing mounting end face (402) and a clutch bearing assembly mounting shaft section (403); the radial foil bearing (2) is arranged between the rotor radial foil bearing mounting shaft section (101) and the radial foil bearing mounting hole (401); the thrust foil bearing (3) is arranged between the thrust foil bearing mounting groove (102) and the thrust foil bearing mounting end face (402); and the clutch bearing assembly (6) is arranged between the clutch bearing assembly mounting seat (103) and the clutch bearing assembly mounting shaft section (403); The clutch bearing assembly (6) includes an inner ring (601), a rolling element (602), a middle ring (603), a clutch wedge element (604), a retaining frame (605), an outer ring (606), and a spring (607). The inner ring (601) and the middle ring (603) are provided with bearing grooves. The rolling element (602) is installed between the bearing grooves and cooperates with the inner ring (601) and the middle ring (603) to realize bearing support. The wedge element (604) is installed between the middle ring (603) and the outer ring (606). The clutch wedge elements (604) are evenly distributed on the circumference of the retaining frame (605). The spring (607) is a coil spring. The spring (607) is installed in spring grooves provided at both ends of the clutch wedge element (604) to maintain the initial contact state of the clutch wedge element (604) and the middle ring (603) and the outer ring (606) and provide a reset elastic force.

2. A high-speed rotor shafting structure according to claim 1, characterized in that: The middle ring (603) and the outer ring (606) are provided with ribs for limiting the axial displacement of the clutch wedge element (604).

3. The high-speed rotor shafting structure according to claim 1, characterized in that: The clutch wedge element (604) has a centrifugal disengagement function, and the clutch wedge element (604) will be disengaged from the middle ring (603) after the rotational speed of the rotor shaft system exceeds a set rotational speed.

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