A dual oil film damping bearing structure with elastic support

Abstract

A dual-oil-film damping bearing structure with elastic support, which relates to a bearing vibration damping support structure. In order to solve the problem of poor reliability when adding a damping and vibration damping structure to the existing bearing structure. In the damping bearing of the present invention, there is a clearance fit between the inner ring and the rotor, and the inner ring of the damping bearing supports the operation of the rotor with an oil film; the cage bars are semi-circular arcs, and the inner ring and the outer ring are fixed through the cage bars; the inner ring of the damping bearing is fixed on the inner ring, and the outer ring of the damping bearing is fixed on the outer ring. There is a clearance fit between the inner ring and the outer ring of the damping bearing; an oil groove is provided on the inner ring of the damping bearing, and an oil inlet hole is provided on the outer ring of the damping bearing. The positions of the oil holes and the oil grooves correspond to each other, and the sealing installation between the inner ring and the outer ring of the damping bearing is realized through a sealing ring; the bearing seat is positioned and installed on the outer ring of the damping bearing. The beneficial effects are to improve the reliability, increase the power density of the whole machine, realize the vibration damping and frequency shift of the unit, and meet the requirements of high-speed mechanical equipment.

Description

Technical Field

[0001] The present invention relates to a bearing vibration damping support structure. Background Art

[0002] The cantilever structure of the commonly used squirrel-cage elastic support nowadays has inevitable disadvantages in the axial dimension; although in recent years, some studies have proposed to replace the squirrel-cage elastic support with a folded-back elastic support to optimize the structural dimensions, high stress is likely to form at the folded-back part of this structure; it is very necessary to design a reasonable elastic support to optimize the bearing structure; in addition, how to avoid resonance is the primary issue studied in rotor dynamics, and the bearing, as a key component that must exist in the rotor system, is widely used in aircraft, ship engines, and rear transmission systems, greatly affecting the dynamic characteristics of the entire shafting; the existing squeeze film damper can achieve the effects of reducing vibration and adjusting the critical speed, but it is necessary to add a new structure to the original bearing structure, which increases the complexity of the shafting, and high complexity will reduce the reliability of the system to a certain extent and increase the possibility of faults. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem of poor reliability when adding a damping and vibration reduction structure to the existing bearing structure. A double oil film damping bearing structure with an elastic support is proposed.

[0004] A double oil film damping bearing structure with an elastic support according to the present invention includes a rotor, a damping bearing inner ring, a damping bearing outer ring, an elastic support, a bearing housing, and a sealing ring;

[0005] A clearance fit is provided between the damping bearing inner ring and the rotor, and the damping bearing inner ring supports the operation of the rotor with an oil film;

[0006] The elastic support includes an inner ring, an outer ring, and cage bars;

[0007] The cage bars are semi-circular arcs, and the inner ring and the outer ring are fixed by the cage bars;

[0008] The damping bearing inner ring is fixed on the inner ring, the damping bearing outer ring is fixed on the outer ring, and a clearance fit is provided between the damping bearing inner ring and the damping bearing outer ring;

[0009] An oil groove is provided on the outer surface of the damping bearing inner ring, and an oil inlet hole is provided on the damping bearing outer ring. The position of the oil hole corresponds to that of the oil groove, and the sealing installation between the damping bearing inner ring and the damping bearing outer ring is achieved through the sealing ring;

[0010] The bearing housing is positioned and installed on the damping bearing outer ring.

[0011] In the damping bearing of the present invention, an oil film is generated between the inner ring of the damping bearing and the rotor during operation through clearance fit to support the rotation of the rotor. This oil film is the first oil film; a second oil film is formed between the inner ring of the damping bearing and the outer ring of the damping bearing through oil supply to provide a damping and vibration reduction effect; the inner ring of the damping bearing and the outer ring of the damping bearing are connected through an elastic support structure to support the inner ring of the damping bearing. This elastic support is in a parallel relationship with the second oil film; because this bearing structure has two oil films, it is called a double-oil-film damping bearing structure.

[0012] The beneficial effects of the present invention are as follows: on the one hand, on the premise of reliable structural strength, the axial dimension is reduced; on the other hand, a double-oil-film damping support structure is adopted, which reduces the radial dimension at the bearing while achieving the adjustment of the critical speed to reduce the resonance amplitude; this double-oil-film damping bearing structure with an elastic support avoids the existing complex structure of adding damping and vibration reduction on the bearing, improving the reliability; optimizing the structural dimensions, increasing the overall machine power density, achieving the vibration reduction and frequency shift of the unit, meeting the requirements of high-speed mechanical equipment, and having certain application value. Description of the Drawings

[0013] Figure 1 It is a cross-sectional view of a double-oil-film damping bearing structure with an elastic support described in Embodiment 1 of the specific implementation manner;

[0014] Figure 2 It is the front view of the elastic support in Embodiment 1 of the specific implementation manner;

[0015] Figure 3 It is the cross-sectional view of the elastic support in Embodiment 1 of the specific implementation manner. Specific Implementation Manner

[0016] Specific Implementation Manner 1: In combination with Figures 1 to 3 This embodiment is described. A double-oil-film damping bearing structure with an elastic support described in this embodiment includes a rotor 1, an inner ring 2 of the damping bearing, an outer ring 3 of the damping bearing, an elastic support 4, a bearing seat 5, and a sealing ring 6;

[0017] A clearance fit exists between the inner ring 2 of the damping bearing and the rotor 1, and the inner ring 2 of the damping bearing supports the operation of the rotor 1 with an oil film;

[0018] The elastic support 4 includes an inner ring, an outer ring, and cage bars;

[0019] The cage bars are semi-circular arcs, and the inner ring and the outer ring are fixed through the cage bars; on the premise of ensuring strength, the elastic support 4 significantly reduces the axial dimension of this bearing structure;

[0020] The inner ring 2 of the damping bearing is fixed on the inner ring, the outer ring 3 of the damping bearing is fixed on the outer ring, and a clearance fit exists between the inner ring 2 of the damping bearing and the outer ring 3 of the damping bearing;

[0021] An oil groove is provided on the outer surface of the inner ring 2 of the damping bearing, and an oil inlet hole is provided on the outer ring 3 of the damping bearing. The position of the oil hole corresponds to that of the oil groove, and the sealing installation between the inner ring 2 and the outer ring 3 of the damping bearing is realized through a sealing ring 6;

[0022] The bearing seat 5 is positioned and installed on the outer ring 3 of the damping bearing; the bearing seat 5 is used to fix the bearing structure.

[0023] In this embodiment, a first oil film is generated during operation between the inner ring 2 of the damping bearing and the rotor 1 through clearance fit to support the operation of the rotor 1; three grooves are provided on the outer surface of the inner ring 2 of the damping bearing. The two sides are sealing ring grooves, and the sealing ring 6 is nested in the sealing ring grooves. The middle is an oil groove. A second oil film is formed by oil supply between the inner ring 2 and the outer ring 3 of the damping bearing to provide a damping and vibration reduction effect; the inner ring 2 and the outer ring 3 of the damping bearing are connected through an elastic support 4 structure to provide support for the inner ring 2 of the damping bearing. This support is in a parallel relationship with the second oil film, that is, the support stiffness is in a superposition relationship; the critical speed of the shafting is adjusted by adjusting the number and width of the elastic support cage bars.

[0024] Specific Embodiment Two: This embodiment further limits a double-oil-film damping bearing structure with an elastic support described in Specific Embodiment One. In this embodiment, an alloy layer 7 is cast on the inner surface of the inner ring 2 of the damping bearing.

[0025] Specific Embodiment Three: This embodiment further limits a double-oil-film damping bearing structure with an elastic support described in Specific Embodiment One. In this embodiment, the bearing seat 5 and the outer ring 3 of the damping bearing are positioned and installed through a pin shaft.

[0026] Specific Embodiment Four: This embodiment further limits a double-oil-film damping bearing structure with an elastic support described in Specific Embodiment One. In this embodiment, the bearing seat 5 and the outer ring 3 of the damping bearing are an integral structure.

[0027] In this embodiment, the outer ring of the elastic support 4 is fixed on the side wall of the bearing seat 5, which can further reduce the radial dimension of the bearing structure and increase the compactness of the bearing structure.

[0028] Specific Embodiment Five: This embodiment further limits a double-oil-film damping bearing structure with an elastic support described in Specific Embodiment One. In this embodiment, the clearance between the inner ring 2 of the damping bearing and the rotor 1 is 1.3‰ - 2.2‰.

[0029] Embodiment Six: This embodiment further defines a dual-oil-film damping bearing structure with elastic support described in Embodiment One. In this embodiment, the clearance between the inner ring 2 and the outer ring 3 of the damping bearing is 1‰ - 3‰.

Claims

1. A double-oil-film damping bearing structure with elastic support, characterized in that, The bearing structure includes a rotor (1), a damping bearing inner ring (2), a damping bearing outer ring (3), an elastic support (4), a bearing housing (5) and a sealing ring (6); A clearance fit is provided between the damping bearing inner ring (2) and the rotor (1), and the damping bearing inner ring (2) supports the operation of the rotor (1) with an oil film; The elastic support (4) includes an inner ring, an outer ring and cage bars; The cage bars are semi-circular arcs, and the inner ring and the outer ring are fixed by the cage bars; The damping bearing inner ring (2) is fixed on the inner ring, the damping bearing outer ring (3) is fixed on the outer ring, and a clearance fit is provided between the damping bearing inner ring (2) and the damping bearing outer ring (3); An oil groove is provided on the outer surface of the damping bearing inner ring (2), an oil inlet hole is provided on the damping bearing outer ring (3), the position of the oil hole corresponds to that of the oil groove, and the sealing installation between the damping bearing inner ring (2) and the damping bearing outer ring (3) is achieved through the sealing ring (6); The bearing housing (5) is positioned and installed on the damping bearing outer ring (3); Three grooves are provided on the outer surface of the damping bearing inner ring (2). The two sides are sealing ring grooves, and the sealing ring (6) is nested in the sealing ring grooves. The middle is an oil groove. A second oil film is formed by supplying oil between the damping bearing inner ring (2) and the damping bearing outer ring (3) to provide a damping and vibration reduction effect; the damping bearing inner ring (2) and the damping bearing outer ring (3) are connected through the elastic support (4) structure to provide support for the damping bearing inner ring (2). This support is in a parallel relationship with the second oil film, that is, the support stiffness is in a superposition relationship; the critical speed of the shafting is adjusted by adjusting the number and width of the elastic support cage bars.

2. The structure of a double-oil-film damping bearing with elastic support according to claim 1, characterized in that, An alloy layer (7) is cast on the inner surface of the damping bearing inner ring (2).

3. A double-oil-film damping bearing structure with elastic support according to claim 1, characterized in that, The bearing housing (5) and the damping bearing outer ring (3) are positioned and installed through a pin shaft.

4. A double oil film damping bearing structure with elastic support according to claim 1, characterized in that, The bearing housing (5) and the damping bearing outer ring (3) are of an integral structure.

5. A double oil film damping bearing structure with elastic support according to claim 1, characterized in that, The clearance between the damping bearing inner ring (2) and the rotor (1) is 1.3‰ - 2.2‰.

6. A double-oil-film damping bearing structure with elastic support according to claim 1, characterized in that, The clearance between the damping bearing inner ring (2) and the damping bearing outer ring (3) is 1‰ - 3‰.

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