High-pollutant-holding-capacity lubricating oil filter for transmission system of main speed reducer of helicopter

Abstract

The invention relates to the technical field of lubricating oil filters, in particular to a high-pollutant-holding-capacity lubricating oil filter for a transmission system of a main speed reducer of a helicopter. A circular side plate of the filter element assembly consists of a protective net, protective paper, a filter layer, lining paper and a lining net in sequence from outside to inside; according to the lubricating oil filter, the whole filter element assembly is cylindrical, the circular side plate of the filter element assembly deforms along the radial line or the axis of the cylindrical filter element assembly so as to increase the filtering area of lubricating oil, the material cost can be reduced, meanwhile, the dirt holding amount can be increased by reducing flow resistance, meanwhile, the contact area between the lubricating oil filter and lubricating oil can be increased, and the filtering effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating oil filters, and in particular to a high-pollution-holding lubricating oil filter for a helicopter main reducer transmission system. Background Art

[0002] As one of the most distinctive creations of aviation technology in the 20th century, helicopters have greatly expanded the application scope of aircraft. Compared with fixed-wing aircraft, they do not require special runways and can perform tasks such as lifting, weapon delivery, rescue, reconnaissance and attack in unprepared sites or desert areas. The helicopter reducer is a key component in the helicopter power system, and its main functions are deceleration, steering and merging. The main reducer is composed of a large number of complex gears. These gears and bearings are made of alloy materials. A certain amount of metal chips will appear due to wear during operation. If the metal chips are not filtered out in time, the wear of the main reducer will be accelerated. For this reason, the filter used in the reducer lubrication system is very important. Due to the space limitations of helicopters and the need for lightweight design, the volume of the filter must not be too large. An important indicator of filter performance is the dirt holding capacity. The dirt holding capacity of existing helicopter filters is generally around 6g, which requires staff to frequently replace the filter. Data that affect the filter's dirt holding capacity include the effective filtration area and the components of the filter material. For example, the existing public document CN210979300U - A lubricating oil filter discloses a lubricating oil filter. Although the filter can effectively filter impurities in the lubricating oil, the side wall area of ​​the filter in contact with the lubricating oil is fixed and limited, which leads to a limited dirt holding capacity and cannot achieve efficient dirt holding. Another example is the existing public document CN111020876A - A high-efficiency filter material with a gradient structure and a production method thereof. It can be seen from the filter material that the existing filter material generally adopts a six-layer design; Therefore, it is necessary to improve the prior art to solve the above-mentioned technical problems. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the problem that the filter of the existing helicopter reducer lubrication system has low dirt holding capacity and needs to be replaced frequently, a high dirt holding capacity lubricating oil filter for the helicopter main reducer transmission system is proposed.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system, comprising a filter element assembly; the circular side plate of the filter element assembly is composed of a protective net, a protective paper, a filter layer, a lining paper and a lining net from the outside to the inside; the filter element assembly is cylindrical as a whole, and the circular side plate of the filter element assembly is deformed along the radial line or axis of the cylinder to increase the filtering area of ​​the lubricating oil.

[0006] As a preferred solution of the high dirt holding capacity lubricating oil filter for the main reducer transmission system of a helicopter of the present invention, the protective net is a 40 mesh / inch stainless steel net, the material of the protective paper is a polyester non-woven fabric, the filter layer is a glass fiber gradient filter paper, the material of the lining paper is a polyester non-woven fabric, and the lining net is a 40 mesh / inch stainless steel net.

[0007] The beneficial effects of the present invention are: when the filter is in use, the traditional filter material of at least six layers is arranged into five layers, which reduces the overall weight and flow resistance. While reducing the complexity of the material, after testing, its dirt holding capacity can reach 10g. Compared with traditional filters, the dirt holding capacity is greatly improved, and the frequency of filter replacement is reduced.

[0008] As a preferred solution of a high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system of the present invention, when the circular side plate of the filter element assembly is deformed along the radial direction of the cylinder, the circular side plate includes an extension portion, and the multiple extension portions are arranged along the circumferential direction of the cylinder; when the circular side plate of the filter element assembly is deformed along the axial direction of the cylinder, the circular side plate includes an extension portion, and the multiple extension portions are arranged along the axial direction of the cylinder.

[0009] Another beneficial effect of the present invention is that when the filter is in use, the circular side plate of the filter element assembly is deformed to increase the contact area between the filter and the lubricating oil in a limited space, thereby improving the filtering and dirt-receiving effects, while meeting the requirements for convenient installation of helicopter filters and having good overall practicality.

[0010] As a preferred solution of the high dirt holding capacity lubricating oil filter of the helicopter main reducer transmission system of the present invention, two adjacent extension parts are connected to form a V-shaped plate, multiple V-shaped plates are evenly arranged along the circumference of the cylinder, and the open ends of two adjacent V-shaped plates are connected.

[0011] As a preferred solution of a high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system of the present invention, two adjacent extension portions are connected by a first connecting portion to form a convex plate, a plurality of convex plates are evenly arranged along the circumference of the cylinder, and the open ends of two adjacent convex plates are connected by a second connecting portion, and the first connecting portion and the second connecting portion are concentric arc plates.

[0012] As a preferred embodiment of the high dirt-holding capacity lubricating oil filter for the main reduction gear transmission system of a helicopter in the present invention, the following is provided: The extension part is a C-shaped plate, and a plurality of extension parts are evenly arranged along the circumferential direction of the cylinder. The open ends of two adjacent extension parts are connected by a third connecting part, and the third connecting part is also a C-shaped plate, and the openings of the two C-shaped plates are arranged close to each other.

[0013] As a preferred embodiment of the high dirt-holding capacity lubricating oil filter for the main reduction gear transmission system of a helicopter in the present invention, the following is provided: The circular side plate of the filter element assembly is deformed along the axis of the cylinder to increase the cross-sectional area of the circular side plate on the premise of ensuring that the distance from the axis of the cylinder remains unchanged.

[0014] As a preferred embodiment of the high dirt-holding capacity lubricating oil filter for the main reduction gear transmission system of a helicopter in the present invention, the following is provided: The extension part is a C-shaped ring, and a plurality of extension parts are arranged in an array along the axial direction of the cylinder. The open ends of two adjacent extension parts are connected by a fourth connecting part, and the fourth connecting part is also a C-shaped ring, and the openings of the two C-shaped rings are arranged close to each other.

[0015] As a preferred embodiment of the high dirt-holding capacity lubricating oil filter for the main reduction gear transmission system of a helicopter in the present invention, the following is provided: Two adjacent extension parts are connected to form a < -shaped ring, a plurality of < -shaped rings are arranged in an array along the axial direction of the cylinder, and the open ends of two adjacent < -shaped rings are connected.

[0016] As a preferred embodiment of the high dirt-holding capacity lubricating oil filter for the main reduction gear transmission system of a helicopter in the present invention, the following is provided: The extension part is a U-shaped ring, a plurality of extension parts are arranged in an array along the axial direction of the cylinder, and the open ends of two adjacent extension parts are connected by a fifth connecting part, and the fifth connecting part is a | -shaped ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them: Figure 1 It is a schematic diagram of the overall structure of the filter element assembly in Embodiment 1 of the present invention.

[0018] Figure 2 It is a schematic diagram of the overall structure of the filter element assembly in Embodiment 2 of the present invention.

[0019] Figure 3 It is a schematic diagram of the overall structure of the filter element assembly in Embodiment 3 of the present invention.

[0020] Figure 4 It is a schematic diagram of the overall structure of the filter element assembly in Embodiment 4 of the present invention.

[0021] Figure 5 This is a schematic diagram of the overall structure of the filter element assembly in Example 5 of the present invention.

[0022] Figure 6 Schematic diagram of the overall structure of the filter element assembly in Example 6 of the present invention.

[0023] Figure 7 It is a cross-sectional view of the filter assembled from the filter element components in Example 1.

[0024] Figure 8 It is a top view of the sealing ring disk in the present invention.

[0025] Fig. 9 It is a cross-sectional view of a circular side plate of the filter element assembly in the present invention. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included. Example 1

[0030] Reference Figure 7 and Figure 8, which is the first embodiment of the present invention, provides a high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system, the filter comprising a filter element assembly 100, a housing 200, a sealing disc 300, a bypass valve 400 and an adapter 500, the filter element assembly 100 is coaxially arranged inside the housing 200, the bypass valve 400 is coaxially arranged inside the filter element assembly 100, the sealing disc 300 is coaxially fixed on one end of the housing 200, the middle part of the sealing disc 300 is spirally sleeved with an adapter 500, and the adapter 500 is coaxially arranged with the bypass valve 400; When in use, four oil inlet grooves 301 are opened on the sealing disk 300 along the circumference. The lubricating oil in the lubricating system enters the housing 200 outside the filter element assembly 100 through the oil inlet grooves 301. After being filtered by the filter element assembly 100, the lubricating oil outside the filter element assembly 100 enters the interior of the filter element assembly 100, and is transferred through the bypass valve 400, and finally discharged from the adapter 500, thereby filtering the lubricating oil in the lubricating system. In addition, during actual use, the end of the filter element assembly 100 will be processed to facilitate cooperation with the housing 200. Please refer to existing public documents and will not be elaborated here.

[0031] See Fig. 9 As shown, specifically, the circular side plate of the filter element assembly 100 is composed of a protective net 103, a protective paper 104, a filter layer 105, a lining paper 106 and a lining net 107 from the outside to the inside; the protective net 103 is a 40 mesh / inch stainless steel net as a protective net, the material of the protective paper 104 is a 30g polyester non-woven fabric as a protective paper, the filter layer 105 is a 20 micron glass fiber gradient filter paper, the material of the lining paper 106 is a 30g polyester non-woven fabric, and the lining net 107 is a 40 mesh / inch stainless steel net as a lining net; It should be noted that the conventional filter element assembly 100 is formed from outside to inside of the filter medium. The first layer of 40 mesh / inch stainless steel mesh is used as a protective mesh. The stainless steel mesh has a large aperture, fine wire diameter, and light mesh weight, resulting in small flow resistance. The second layer of 30g polyester non-woven fabric is used as a protective filter paper. The third layer is a filter layer, which uses a 40-micron glass fiber composite filter paper. The fourth layer is a main filter layer, which is used to ensure the filtering accuracy of the entire product. A 20-micron glass fiber composite filter paper is used. The fifth layer is 30g polyester non-woven fabric as a backing paper. The sixth layer uses a 40-mesh / inch stainless steel mesh as a backing mesh. The above main filter papers are products of Nanjing Glass Fiber Research and Design Institute, a well-known domestic manufacturer. After this filter material combination is manufactured into a filter element, a material content test is performed, and the result is only 6.82g. This filter element assembly 100 is equivalent to compounding the 40-micron glass fiber composite filter paper and the 20-micron glass fiber composite filter paper in the traditional filter element assembly 100 into a layer during filter paper production. The outer layer is a coarse filter layer, and the inner layer is a fine filter layer. The coarse filter layer is used to capture pollutant particles in the medium to reduce the burden of the fine filter layer and increase the service life of the glass fiber filter material. The fine filter layer is used to ensure the filtration efficiency of the filter material. The two-layer gradient structure of coarse filtration and fine filtration can greatly extend the service life of the filter material while ensuring the filtration effect. The pollution holding capacity of this filter element assembly 100 can reach 10g.

[0032] See Figure 1 As shown, the filter element assembly 100 is cylindrical as a whole, and the circular side plate of the filter element assembly 100 is deformed along the radial line of the cylinder to increase the filtering area of ​​the lubricating oil. When the circular side plate of the filter element assembly 100 is deformed along the radial direction of the cylinder, the circular side plate includes an expansion portion 101, and multiple expansion portions 101 are arranged along the circumference of the cylinder.

[0033] Furthermore, two adjacent extension portions 101 are connected to form a V-shaped plate, and a plurality of V-shaped plates are evenly arranged along the circumference of the cylinder, and the opening ends of two adjacent V-shaped plates are connected. This arrangement can increase the contact area between the side wall of the filter element assembly 100 and the lubricating oil, so as to improve the filtering effect and the dirt holding capacity. Figure 1 Ⅰ is a schematic diagram of the overall structure of the filter element assembly 100, and Ⅱ is a cross-sectional diagram of the filter element assembly 100 in the radial direction. Example 2

[0034] Reference Figure 2 , which is the second embodiment of the present invention, is based on the previous embodiment, except that the circular side plate of the filter element assembly 100 is deformed along the cylindrical diameter line in another way, which facilitates better implementation of the device while increasing the contact area with the lubricating oil.

[0035] Specifically, two adjacent expansion portions 101 are connected by a first connection portion 101a to form a convex plate, and a plurality of convex plates are evenly arranged along the circumference of the cylinder, and the opening ends of two adjacent convex plates are connected by a second connection portion 101b, and the first connection portion 101a and the second connection portion 101b are concentric arc plates. This arrangement can increase the contact area between the side wall of the filter element assembly 100 and the lubricating oil, so as to improve the filtering effect and the dirt holding capacity. Figure 2 Ⅰ is a schematic diagram of the overall structure of the filter element assembly 100, and Ⅱ is a cross-sectional diagram of the filter element assembly 100 in the radial direction. Example 3

[0036] Reference Figure 3, which is the third embodiment of the present invention, is based on embodiment 1, except that the circular side plate of the filter element assembly 100 is further deformed along the cylindrical diameter line, which facilitates better implementation of the device while increasing the contact area with the lubricating oil.

[0037] Specifically, the extension part 101 is a C-shaped plate, and the plurality of extension parts 101 are evenly arranged along the circumference of the cylinder, the opening ends of the two connected extension parts 101 are connected by a third connecting part 101c, the third connecting part 101c is also a C-shaped plate, and the openings of the two C-shaped plates are arranged close to each other, which can increase the contact area between the side wall of the filter element assembly 100 and the lubricating oil, so as to improve the filtering effect and the dirt holding capacity. Figure 3 Ⅰ is a schematic diagram of the overall structure of the filter element assembly 100, and Ⅱ is a cross-sectional diagram of the filter element assembly 100 in the radial direction. Example 4

[0038] Reference Figure 4 , which is the fourth embodiment of the present invention, is based on embodiment 1, and the difference is that the circular side plate of the filter element assembly 100 is deformed along the cylindrical axis to increase the filtering area of ​​the lubricating oil, and this deformation increases the cross-sectional area of ​​the circular side plate while ensuring that the distance of the cylindrical axis remains unchanged. When the circular side plate of the filter element assembly 100 is deformed along the cylindrical axis, the circular side plate includes an extension portion 102, and a plurality of extension portions 102 are arranged along the cylindrical axis.

[0039] Specifically, the extension portion 102 is a C-shaped ring, and a plurality of extension portions 102 are arranged in an array along the axial direction of the cylinder. The opening ends of two adjacent extension portions 102 are connected by a fourth connecting portion 102a, and the fourth connecting portion 102a is also a C-shaped ring, and the two C-shaped ring openings are arranged close to each other. This arrangement can increase the contact area between the side wall of the filter element assembly 100 and the lubricating oil while keeping the distance between the cylindrical axis unchanged, so as to improve the filtering effect and the dirt holding capacity while better meeting the design requirements of helicopter space convenience. Figure 4 Ⅰ is a schematic diagram of the overall structure of the filter element assembly 100, and Ⅱ is a cross-sectional view of the filter element assembly 100 in the axial direction. Example 5

[0040] Reference Figure 5 , which is the fifth embodiment of the present invention, is based on embodiment 4, except that the circular side plate of the filter element assembly 100 is deformed along the cylindrical axis in another way, and this deformation increases the cross-sectional area of ​​the circular side plate while ensuring that the distance between the cylindrical axis and the cylindrical axis remains unchanged, thereby facilitating better implementation of the present device while increasing the contact area with the lubricating oil.

[0041] Specifically, two adjacent extensions 102 are connected to form a <-shaped ring, and a plurality of <-shaped rings are arranged in an array along the axial direction of the cylinder, and the open ends of two adjacent <-shaped rings are connected. This arrangement can increase the contact area between the side wall of the filter element assembly 100 and the lubricating oil while keeping the distance between the axial lines of the cylinder unchanged, so as to improve the filtering effect and the dirt holding capacity while better meeting the design requirements of helicopter space convenience. Figure 5 Ⅰ is a schematic diagram of the overall structure of the filter element assembly 100, and Ⅱ is a cross-sectional view of the filter element assembly 100 in the axial direction. Example 6

[0042] Reference Figure 6 , which is the sixth embodiment of the present invention, is based on embodiment 4, but differs in that the circular side plate of the filter element assembly 100 is further deformed along the cylindrical axis, and this deformation increases the cross-sectional area of ​​the circular side plate while ensuring that the distance from the cylindrical axis remains unchanged, thereby facilitating better implementation of the present device while increasing the contact area with the lubricating oil.

[0043] Specifically, the extension portion 102 is a ⌚-shaped ring, and a plurality of extension portions 102 are arranged in an array along the axial direction of the cylinder, and the open ends of two adjacent extension portions 102 are connected by a fifth connecting portion 102b, and the fifth connecting portion 102b is a ⌚-shaped ring. This arrangement can increase the contact area between the side wall of the filter element assembly 100 and the lubricating oil while keeping the distance between the axial line of the cylinder unchanged, so as to improve the filtering effect and the dirt holding capacity while better meeting the design requirements of helicopter space convenience. Figure 6 Ⅰ is a schematic diagram of the overall structure of the filter element assembly 100, and Ⅱ is a cross-sectional view of the filter element assembly 100 in the axial direction.

[0044] In addition, it should be noted that the components not described in detail in this article are prior art.

[0045] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of a plurality of parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0046] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention).

[0047] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high-pollution-holding oil filter for the main reducer transmission system of a helicopter. Features: Including filter element assembly; The circular side plate of the filter element assembly is composed of a protective net, protective paper, filter layer, lining paper and lining net in sequence from outside to inside; The filter element assembly is cylindrical in shape as a whole, and the circular side plate of the filter element assembly is deformed along the diameter or axis of the cylinder to increase the filtering area of ​​the lubricating oil.

2. A high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system as claimed in claim 1, Features: The protective net is a 40-mesh / inch stainless steel net, the protective paper is made of polyester non-woven fabric, the filter layer is glass fiber gradient filter paper, the lining paper is made of polyester non-woven fabric, and the lining net is a 40-mesh / inch stainless steel net.

3. A high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system as claimed in claim 2, Features: When the circular side plate of the filter element assembly is deformed along the radial direction of the cylinder, the circular side plate includes an expansion portion, and a plurality of the expansion portions are arranged along the circumference of the cylinder; When the circular side plate of the filter element assembly is deformed along the axial direction of the cylinder, the circular side plate includes an extension portion, and a plurality of the extension portions are arranged along the axial direction of the cylinder.

4. A high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system as claimed in claim 3, Features: Two adjacent expansion parts are connected to form a V-shaped plate, a plurality of the V-shaped plates are evenly arranged along the circumference of the cylinder, and the open ends of two adjacent V-shaped plates are connected.

5. A high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system as claimed in claim 3, Features: Two adjacent expansion parts are connected by a first connection part to form a convex plate, and a plurality of the convex plates are evenly arranged along the circumference of the cylinder, and the opening ends of two adjacent convex plates are connected by a second connection part, and the first connection part and the second connection part are concentric arc plates.

6. A high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system as claimed in claim 3, Features: The expansion part is a C-shaped plate, and multiple expansion parts are evenly arranged along the circumference of the cylinder. The opening ends of two connected expansion parts are connected by a third connecting part. The third connecting part is also a C-shaped plate, and the openings of the two C-shaped plates are arranged close to each other.

7. A high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system as claimed in claim 3, Features: The circular side plate of the filter element assembly is deformed along the cylindrical axis to increase the cross-sectional area of ​​the circular side plate while ensuring that the distance between the cylindrical axis remains unchanged.

8. A high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system as claimed in claim 7, Features: The extension part is a C-shaped ring, and multiple extension parts are arranged in an array along the axial direction of the cylinder. The opening ends of two adjacent extension parts are connected by a fourth connecting part, and the fourth connecting part is also a C-shaped ring, and the two C-shaped ring openings are arranged close to each other.

9. A high dirt holding capacity lubricating oil filter for a helicopter main reducer transmission system as claimed in claim 7, Features: Two adjacent extension portions are connected to form a <-shaped ring, and a plurality of the <-shaped rings are arranged in an array along the axial direction of the cylinder, and the open ends of two adjacent <-shaped rings are connected.

10. A high oil contamination capacity lubricating oil filter for the main reduction gear transmission system of a helicopter as described in claim 7, characterized in that: the extension part is a C-shaped ring, a plurality of extension parts are arranged in an array along the axial direction of the cylinder, and the open ends of two adjacent extension parts are connected by a fifth connecting part, and the fifth connecting part is an I-shaped ring.

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