阅读说明：本技术 用于集成式驱动发电机的机油滤清器组件 (Oil filter assembly for integrated drive generator ) 是由 D.R.霍赫斯特特勒 G.C.小莱默斯 于 2019-12-13 设计创作，主要内容包括：公开了一种用于集成式驱动发电机的机油滤清器组件,所述机油滤清器组件包括细长圆柱形过滤元件,所述细长圆柱形过滤元件具有相对的上端部和下端部、纵向轴线、外径和内径,其中包括所述过滤元件的所述机油滤清器组件的轴向长度大于4.60英寸。(An oil filter assembly for an integrated drive generator is disclosed, the oil filter assembly comprising an elongated cylindrical filter element having opposed upper and lower ends, a longitudinal axis, an outer diameter and an inner diameter, wherein the axial length of the oil filter assembly including the filter element is greater than 4.60 inches.)

1. An oil filter assembly for an integrated drive generator, the oil filter assembly comprising:

an elongated cylindrical filter element having opposed upper and lower ends, a longitudinal axis, an outer diameter, and an inner diameter, wherein the axial length of the oil filter assembly including the filter element is greater than 4.60 inches.

2. The oil filter assembly of claim 1 wherein an upper end cap is operatively associated with the upper end of the filter element and has an axial length of about 0.10 inches.

3. The oil filter assembly of claim 1 wherein a lower end cap is operatively associated with the lower end of the filter element and has an axial length of about 0.42 inches.

4. The oil filter pack of claim 1 wherein the axial length of the filter pack is about 4.68 inches to about 4.75 inches.

5. The oil filter assembly of claim 1 wherein the filter element has a maximum outer diameter of 1.78 inches.

6. The oil filter assembly of claim 1 wherein the filter element has a dirt holding capacity of greater than 3.7 grams.

7. The oil filter assembly of claim 1 wherein the maximum pressure drop across the filter element is 10psi at an oil flow rate of 17.5 gallons per minute and a fluid viscosity of 27 centipoise.

8. The oil filter assembly of claim 1 wherein the filter element is a pleated filter element having an upstream support layer and a downstream drainage layer.

9. The oil filter assembly of claim 1 wherein the filter element has a perforated core operatively associated with the inner diameter of the filter element.

10. An oil filter assembly for an integrated drive generator, the oil filter assembly comprising:

a) an elongated cylindrical pleated filter element having opposed upper and lower ends, a longitudinal axis, an outer diameter and an inner diameter;

b) an upper end cap operatively associated with the upper end of the pleated filter element and having an axial length of about 0.10 inches;

c) a lower end cap operatively associated with the lower end of the pleated filter element and having an axial length of about 0.42 inches; and

d) a perforated core tube operatively associated with the inner diameter of the pleated filter element and extending between the upper and lower end caps, wherein the oil filter assembly has an axial length greater than 4.60 inches.

11. The oil filter pack of claim 10 wherein the axial length of the oil filter pack is about 4.68 inches to about 4.75 inches.

12. The oil filter assembly of claim 10 wherein the pleated filter element has a maximum outer diameter of 1.78 inches.

13. The oil filter assembly of claim 10 wherein the pleated filter element has a dirt holding capacity of greater than 3.7 grams.

14. The oil filter assembly of claim 10 wherein the maximum pressure drop across the pleated filter element is 10psi at an oil flow rate of 17.5 gallons per minute and a fluid viscosity of 27 centipoise.

15. The oil filter assembly of claim 10 wherein the pleated filter element is a multi-layer composite having a plurality of media layers defined by an upstream support layer and a downstream drainage layer.

Technical Field

The present invention relates to an oil filter assembly and, more particularly, to an oil filter assembly for use with an Integrated Drive Generator (IDG) coupled to a gas turbine engine.

Background

Aircraft currently rely on electrical, pneumatic and hydraulic systems for secondary power generation. Typical electrical systems in aircraft utilize IDGs coupled to gas turbine engines to provide fixed frequency electrical power to power distribution systems and various loads.

An exemplary IDG includes a generator, a hydraulic unit, and a differential assembly disposed in a common housing. The differential assembly is coupled to the gas turbine engine by way of an input shaft. The rotational speed of the input shaft varies during operation of the gas turbine engine. The hydraulic unit cooperates with the differential assembly to provide a constant speed to the generator throughout the operating range of the engine.

IDG operates at high temperatures. Synthetic engine oils are used for cooling and lubrication in IDGs and as working fluids. In these systems, minute metal wear particles are formed during normal operation. These wear particles are carried by the oil into the oil circuit and must be removed to maintain the operating efficiency and useful life of the system.

Thus, the oil circuit includes an oil filter in a housing having an outer casing that facilitates installation, removal, and periodic replacement of the oil filter. There is also a need to design the oil filter to optimize the dirt holding capacity and service life of the oil filter. Typically, this is achieved by increasing the amount of filter media within a fixed size of the filter cartridge, as the size of the filter housing supporting the filter cartridge cannot be changed due to space limitations, especially in the case of IDGs coupled to gas turbine engines on board aircraft.

However, as the amount of filter media within the cartridge decreases, the pressure drop across the filter cartridge increases, thereby affecting the efficiency of the system. Therefore, it is beneficial to maximize the amount of filter media in an oil filter without increasing the pressure drop in the filter cartridge. The present invention provides a solution by means of a uniquely configured cover for an oil filter housing designed to accommodate a filter cartridge, the cover having an axial length greater than the axial length of the filter housing it accommodates while remaining within space limitations that permit the cover and filter to be removed from the housing at any time for routine maintenance purposes.

Disclosure of Invention

The present invention is directed to a novel and useful oil filter assembly for an Integrated Drive Generator (IDG) coupled to a gas turbine engine. The oil filter assembly includes an elongated cylindrical filter element having opposite upper and lower ends, a longitudinal axis, an outer diameter, and an inner diameter, wherein the axial length of the oil filter assembly including the filter element is greater than 4.60 inches.

The oil filter assembly further comprises: an upper end cap operatively associated with the upper end of the filter element and having an axial length of about 0.10 inches; and a lower end cap operatively associated with the lower end of the filter element and having an axial length of about 0.42 inches.

The axial length of the filter assembly is about 4.68 inches to about 4.75 inches, and the maximum outer diameter of the filter element is 1.78 inches. The filter element has a dirt holding capacity of greater than 3.7 grams and a maximum pressure drop across the filter element of 10psi at an oil flow rate of 17.5 gallons per minute and a fluid viscosity of 27 centipoise.

Preferably, the filter element is a pleated filter element and it comprises a multilayer composite having a plurality of media layers bounded by an upstream support layer and a downstream drainage layer, and a perforated core is operatively associated with the inner diameter of the filter element.

The invention also relates to an oil filter assembly for an integrated drive generator, the oil filter assembly comprising: an elongated cylindrical pleated filter element having opposite upper and lower ends, a longitudinal axis, an outer diameter and an inner diameter; an upper end cap operatively associated with the upper end of the pleated filter element and having an axial length of about 0.10 inches; a lower end cap operatively associated with the lower end of the pleated filter element and having an axial length of about 0.42 inches; and a perforated core tube operatively associated with the inner diameter of the pleated filter element and extending between the upper and lower end caps, wherein the oil filter assembly has an axial length greater than 4.60 inches, and preferably from about 4.68 inches to about 4.75 inches.

These and other features of the oil filter cartridge assembly of the present invention will become more readily apparent to those having ordinary skill in the art from the following detailed description of the preferred embodiments, which is briefly described in connection with the following drawings.

Drawings

So that those having ordinary skill in the art to which the subject invention pertains will readily understand how to make and use the subject invention without undue experimentation, preferred embodiments thereof will be described in detail below with reference to the drawings, wherein:

FIG. 1 is a schematic representation of an Integrated Drive Generator (IDG) coupled to a gas turbine engine utilizing an oil filter assembly of the present invention;

FIG. 2 is a perspective view of the oil filter assembly of the present invention with the filter cap removed from the IDG filter housing;

FIG. 3 is an exploded perspective view of the oil filter cartridge of the present invention, with parts separated for ease of illustration;

FIG. 4 is a cross-sectional view of the filter cartridge assembly of the present invention taken along line 4-4 of FIG. 3;

FIG. 5 is an enlarged fragmentary view of the lower end cap of the filter cartridge of the present invention taken from FIG. 4; and

FIG. 6 is an enlarged partial cross-sectional view taken along line 6-6 of FIG. 1 illustrating the elongated oil filter cartridge of the present invention within a housing enclosed by a cover and showing the fluid flow path through the oil filter.

Detailed Description

Referring now to the drawings, in which like reference numbers identify similar structural features, there is illustrated in FIG. 1 an Integrated Drive Generator (IDG)10 coupled to a gas turbine engine 12 employing a new and useful oil filter cartridge assembly 16 of the present invention. More specifically, as shown in FIG. 2, the filter cartridge assembly 16 houses a filter cartridge housing 18 that is closed by the outer cover 14. The cover 14 and filter cartridge assembly 16 are sized and configured to remain within space limitations that permit the cover 14 and oil filter cartridge 16 to be removed from the housing 18 of the IDG 10 at any time for routine maintenance purposes.

Referring now to fig. 3, the oil filter cartridge assembly 16 includes an elongated, generally cylindrical, radially pleated filter element 20, an upper end cap 22 operatively associated with an upper end of the filter element 20, a lower end cap 24 operatively associated with a lower end of the filter element 20, and a perforated central core tube 26 coaxially positioned within a central bore of the filter element 20.

Preferably, the filter element 20 is a multi-layer composite filter element that includes a plurality of media layers defined by an upstream support layer and a downstream drainage layer. The media may be formed of woven or non-woven material, and the support layer and drainage layer are preferably formed of a mesh or screen material. The core tube 26 is preferably fitted or otherwise connected to the upper end cap 22 and the lower end cap 24. As best seen in fig. 5, the lower end cap 24 has an axial bore 30 in communication with the central core tube 26 and includes an annular recessed channel 32 that receives an annular seal 34.

According to a preferred embodiment of the present invention, the axial length (L) of the oil filter cartridge assembly 16_{Filter cartridge}) Greater than the axial length of the filter housing 18 in which it is housed, as best seen in fig. 6. Preferably, as shown in FIG. 4, the oil filter pack 16 has an overall axial length L greater than 4.60 inches_{Filter cartridge}. More specifically, the overall axial length L of the filter cartridge assembly 16_{Filter cartridge}Preferably about 4.68 inches to about 4.75 inches. The upper end cap 22 preferably has an axial length (L) of about 0.10 inches_{On the upper part}) And the lower end cap preferably has an axial length (L) of about 0.42 inches_{Lower part})。

In addition, the maximum outer diameter (D) of the filter element 20_{Outer cover}) About 1.78 inches. Preferably, the filter element 20 has a dirt holding capacity of greater than 3.7 grams, and the maximum pressure drop across the filter element 20 is preferably about 10psi at an oil flow rate of 17.5 gallons per minute and a fluid viscosity of 27 centipoise.

Referring now to fig. 6, when the oil filter cartridge assembly 16 is installed in the housing 18 of the IDG 10, the end of the oil filter cartridge assembly 16 advantageously fits within the axial bore 15 of the bonnet 14. Further, when the end of the oil filter cartridge assembly 16 is positioned within the axial bore 15 of the cover 14, the oil filter extends within the cover 14 beyond the housing 18. This allows the axial length of the oil filter cartridge assembly 16 to be greater than the axial length of the filter housing 18 in which it is housed. As a result, the dirt holding capacity and service life of the oil filter cartridge assembly 16 may be optimized while the cover 14 remains within space limitations that permit the cover 14 and oil filter 16 to be removed from the housing 18 of the IDG 10 at any time for routine maintenance purposes.

While the disclosure has been shown and described with reference to preferred embodiments, it will be readily appreciated by those skilled in the art that changes and/or modifications may be made thereto without departing from the scope of the disclosure.