Sectional type sliding supporting and lubricating structure applied to flying attachment casing lubricating oil pump

Abstract

The invention belongs to the technical field of mechanical transmission, and particularly relates to a sectional type sliding supporting and lubricating structure applied to a flying attachment casing lubricating oil pump, which comprises an outer shell, a flow distribution shell, a driving shaft, a rotor pair and a sliding bearing, the plurality of sliding bearings are arranged on the driving shaft in a sectional manner; the rotor pair is meshed with the driving shaft and rotates along with the driving shaft; the outer shell and the flow distribution shell form a pump shell of the lubricating oil pump and serve as an installation carrier of the sliding bearing. A lubricating oil hole is formed in the circumference of any sliding bearing and is communicated with the lubricating oil channel in the inner ring of the sliding bearing; oil grooves are formed in the sides, facing a pump high-pressure outlet, of the outer shell and the flow distribution shell, and oil through holes for leading the oil grooves to the sliding bearing are further formed in the two shells. By the adoption of a sectional type sliding supporting and lubricating structure, the sliding oil pump is small in space size, light in weight, stable in operation under the high-rotating-speed working condition, high in anti-pollution capacity, long in service life and capable of meeting the use requirement of an aircraft accessory cartridge receiver lubricating oil system lubricating oil pump under the extremely-high-rotating-speed working condition.

Description

Technical Field

[0001] This invention belongs to the field of mechanical transmission technology, specifically relating to, but not limited to, the lubricating pump of the lubricating oil system of aircraft accessory casing, and to a segmented sliding bearing support and lubrication structure. Background Technology In the lubrication system of aircraft accessory housings, in order to dissipate heat from the mechanical transmission components inside the housing, an oil pump is used to extract the lubricating oil for heat dissipation and circulate it for cooling.

[0002] Currently, the lubricating oil pumps of aircraft accessory casing lubrication systems typically adopt the structure of cycloidal rotor gear pumps, which have advantages such as compact structure, small size, large displacement, smooth operation, and low noise. However, under the current and future development trends, the following constraints exist.

[0003] As product structural dimensions and weight requirements continue to increase, as do product rotation speeds, the requirements for axial support of lubricating pumps also increase. Traditional radial bearings can no longer meet system requirements and face the risks of excessive weight, excessive size, and accelerated wear. Summary of the Invention

[0004] Purpose of the invention: To solve the above problems, the embodiments of the present invention provide a segmented sliding support and lubrication structure to solve the problems of excessive weight and size and accelerated wear caused by the use of transmission bearing support for the lubricating pump of the lubricating oil system of aircraft accessory casing when the rotational speed is greatly increased.

[0005] Technical Solution: To achieve the above-mentioned objectives, this invention proposes a segmented sliding support and lubrication structure for an oil pump with an attachment casing. The structure includes: an outer shell, a distribution shell, a drive shaft, a rotor pair, and sliding bearings; multiple sliding bearings are arranged in segments on the drive shaft; the rotor pair meshes with the drive shaft and rotates with the drive shaft; the outer shell and the distribution shell form the pump housing of the oil pump and serve as the mounting carrier for the sliding bearings. Any sliding bearing has a lubricating oil hole on its circumference, which is connected to the lubricating oil passage on the inner ring of the sliding bearing. Oil grooves are provided on the side of the outer casing and the distribution casing facing the high-pressure outlet of the pump. Oil passage holes leading to the sliding bearing are also provided in the two casings. High-pressure oil enters the sliding bearing in sequence through the oil grooves, oil passage holes, and lubricating oil holes. Lubricating oil flows through the lubricating oil passage to the gap between the sliding bearing and the drive shaft to establish a stable oil film. Under pressure, the lubricating oil returns to the low-pressure inlet of the pump through the oil grooves on the distribution surface of the outer casing and the intermediate distribution casing facing the low-pressure inlet of the pump, completing the circulation of the lubricating oil circuit and carrying away local heat.

[0006] Furthermore, excess lubricating oil in the oil pump can also be discharged from the entire structure by setting a through-hole in the middle of the drive shaft.

[0007] Furthermore, the sliding bearing is integrated into the outer casing and distribution housing structure, and is fixed by a tight fit. It can be installed using a heating process.

[0008] Furthermore, the sliding bearing is made of PEEK polyether ether ketone material and has internal lubrication holes and lubrication channels. By setting a reasonable working clearance, it can achieve stable operation at speeds above 10,000 r / min.

[0009] Furthermore, the radial support positions should be reasonably set according to the flow requirements of each outlet and the number of rotor pairs. When the span between the supports on both sides is too large, a segmented sliding bearing support point can be added in the middle of the span. The support gap in the middle should be relatively large.

[0010] Furthermore, the drive shaft is provided with a retaining ring groove to restrict the axial movement of the rotor pair, which, together with the positioning of the outer casing, achieves the axial positioning of the entire structure.

[0011] Furthermore, depending on system requirements, the drive shaft can be designed as a hollow structure to facilitate the discharge and return of internal lubricating oil.

[0012] Furthermore, among the multiple sliding bearings, the sliding bearings located at the beginning and end have relatively small clearances with the drive shaft.

[0013] Technical benefits: This invention adopts a segmented sliding support and lubrication structure, which has a small volume, light weight, stable operation under high speed conditions, strong anti-pollution ability, and long service life. It can meet the requirements of the lubricating pump of the lubricating oil system of aircraft accessory casing under extremely high speed conditions. Attached Figure Description

[0014] Figure 1 This is a diagram illustrating the overall structure and principle of the present invention; Figure 2 This is a schematic diagram of a sliding bearing; Figure 3 This is a schematic diagram of the lubrication oil circuit.

[0015] The components include: drive shaft 1, sliding bearing 2, outer housing 3, distribution housing 4, retaining ring 5, and rotor pair 6. Detailed Implementation

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings or specific implementation examples. It should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described, and these examples should not be construed as limited to the examples set forth herein. Rather, these examples are described to better demonstrate the positive effects of the present invention, and all aspects not detailed herein are considered to be well-known or conventional techniques in the art.

[0017] See appendix Figures 1-3 In the specific implementation of this invention, a segmented sliding support and lubrication structure for an oil pump applied to an airframe casing is designed. The structure includes: a drive shaft 1, sliding bearings 2, an outer shell 3, a distribution shell 4, a retaining ring 5, and a rotor pair 6. Multiple sliding bearings 2 are arranged in segments on the drive shaft 1. The rotor pair 6 meshes with the drive shaft 1 and rotates with the drive shaft. The outer shell 3 and the distribution shell 4 form the pump housing of the oil pump and serve as the mounting carrier for the sliding bearings 2. See appendix Figure 2 Any sliding bearing has a lubricating oil hole 2A on its circumference, which is connected to the lubricating oil passage 2B on the inner ring of the sliding bearing. Combined with appendix Figure 1 , 3 Oil grooves are provided on the side of the outer shell 3 and the distribution shell 4 facing the high pressure outlet of the pump. Oil passage holes leading to the sliding bearing are also provided in the two shells. High pressure oil enters the sliding bearing in sequence through the oil groove, the oil passage hole and the lubricating oil hole. The lubricating oil flows through the lubricating oil passage to the gap between the sliding bearing and the drive shaft to establish a stable oil film. Under pressure, the lubricating oil returns to the low pressure inlet of the pump through the oil groove on the distribution surface of the outer shell and the intermediate distribution shell facing the low pressure inlet of the pump, completing the circulation of the lubricating oil circuit and carrying away local heat.

[0018] Example 1, based on the above structural design: The retaining ring 5 is installed in the retaining ring groove on the drive shaft. The retaining ring 5 restricts the axial movement of a certain rotor pair 6 and works with the outer casing 3 to achieve axial positioning of the overall internal structure.

[0019] The sliding bearing 2 is made of PEEK (polyetheretherketone) material and is integrated into the outer shell 3 and the distribution shell 4. It is fixed by a tight fit and has a suitable clearance with the drive shaft 1, enabling stable and long-life operation under high-speed conditions. To improve working stability, a segmented sliding support is set, with relatively small clearances at both ends and a relatively large clearance in the middle sliding bearing for auxiliary support.

[0020] To achieve stable and long-life operation of the sliding bearing under high-speed conditions, a stable oil film needs to be established within the clearance; therefore, a lubrication oil passage is provided. An oil groove is provided on the side of the outer casing and intermediate distribution housing facing the high-pressure outlet of the pump. High-pressure oil is introduced into the sliding bearing through oil passages in the oil grooves. Lubricating oil holes and passages are provided inside the sliding bearing. The lubricating oil flows through the passages to the clearance between the sliding bearing and the drive shaft, establishing a stable oil film. Under pressure, the lubricating oil returns to the low-pressure inlet of the pump through the oil grooves on the distribution surface of the outer casing and intermediate distribution housing facing the low-pressure inlet, completing the circulation of the lubricating oil and carrying away localized heat. Excess lubricating oil in the product can also be discharged through a through-hole in the middle of the drive shaft.

[0021] The above specific embodiments or examples are only used to explain the technical solutions of the present invention and are not intended to limit the present application. Parts not described in detail are considered to be conventional technical means or common knowledge in the field. It can be understood by those skilled in the art that, based on the design concept of the present application, the technical solutions described in the foregoing embodiments can be adapted or some or all of the technical features can be equivalently replaced. These modifications, equivalent replacements, and adaptive improvements do not depart from the technical essence of the present invention and should all be covered within the protection scope of the present application.

Claims

1. A segmented sliding support and lubrication structure for an oil pump used in an aircraft casing, characterized in that, The structure includes: an outer shell, a distribution shell, a drive shaft, a rotor pair, and sliding bearings; multiple sliding bearings are arranged in sections on the drive shaft; the rotor pair meshes with the drive shaft and rotates with the drive shaft; the outer shell and the distribution shell form the pump housing of the lubricating oil pump and serve as the mounting carrier for the sliding bearings; Any sliding bearing has a lubricating oil hole on its circumference, which is connected to the lubricating oil passage on the inner ring of the sliding bearing. Oil grooves are provided on the side of the outer casing and the distribution casing facing the high-pressure outlet of the pump. Oil passage holes leading to the sliding bearing are also provided in the two casings. High-pressure oil enters the sliding bearing in sequence through the oil grooves, oil passage holes, and lubricating oil holes. Lubricating oil flows through the lubricating oil passage to the gap between the sliding bearing and the drive shaft to establish a stable oil film. Under pressure, the lubricating oil returns to the low-pressure inlet of the pump through the oil grooves on the distribution surface of the outer casing and the intermediate distribution casing facing the low-pressure inlet of the pump, completing the circulation of the lubricating oil circuit and carrying away local heat.

2. The segmented sliding support and lubrication structure for an oil pump applied to a flight casing as described in claim 1, characterized in that, Excess lubricating oil in the oil pump can be discharged through a through-hole in the middle of the drive shaft.

3. The segmented sliding support and lubrication structure for an oil pump applied to a flight casing as described in claim 1, characterized in that, The sliding bearing is integrated into the outer shell and distribution shell structure and is fixed by a tight fit.

4. The segmented sliding support and lubrication structure for an oil pump applied to a flight casing as described in claim 3, characterized in that, The sliding bearing is made of PEEK (polyether ether ketone) material.

5. The segmented sliding support and lubrication structure for an oil pump applied to a flight casing as described in claim 1, characterized in that, Based on the flow requirements of each outlet and the number of rotor pairs, the radial support positions should be set reasonably. When the span between the supports on both sides is too large, a segmented sliding bearing support point can be added in the middle of the span. The support gap in the middle should be set relatively large.

6. The segmented sliding support and lubrication structure for an oil pump applied to a flight casing as described in claim 5, characterized in that, Among multiple sliding bearings, the sliding bearings located at the beginning and end have relatively small clearances with the drive shaft.

7. The segmented sliding support and lubrication structure for an oil pump applied to a flight casing as described in claim 1, characterized in that, The drive shaft is equipped with a retaining ring groove to restrict the axial movement of the rotor pair, which, together with the positioning of the outer casing, achieves the overall axial positioning of the structure.

8. The segmented sliding support and lubrication structure for an oil pump applied to a flight casing as described in claim 1, characterized in that, The drive shaft can be designed as a hollow structure to facilitate the discharge and return of internal lubricating oil.

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