Propeller pitch limiting system

Abstract

The present application relates to a kind of propeller variable pitch limiting system, belong to the technical field of aircraft, including: speed regulator, shaft sleeve and beta pipe, speed regulator shell is equipped with mounting hole inside and its side wall is equipped with large distance oil hole and small distance oil hole;Shaft sleeve is fixed in mounting hole and its upper is equipped with large distance transfer hole and small distance transfer hole, its inside is fixed with three closed rings;Beta pipe is sealed and slidably arranged on three closed rings and its pipe wall is equipped with small distance inlet and outlet oil hole and large distance inlet and outlet oil hole at intervals.The present application is first used large distance oil hole, large distance transfer hole, large distance oil supply area and large distance inlet and outlet oil hole are sequentially connected, and then small distance oil hole, small distance transfer hole, small distance oil supply area and small distance inlet and outlet oil hole are sequentially connected, can use small distance inlet and outlet oil hole when large distance inlet and outlet oil hole supplies oil, also can use large distance inlet and outlet oil hole when small distance inlet and outlet oil hole supplies oil, realize propeller large, small distance change, simplify variable pitch system structure, improve its reliability.

Description

Technical Field

[0001] This invention relates to the field of aircraft technology, and in particular to a propeller pitch limiting system. Background Technology

[0002] As the power unit of an aircraft, the propeller's rotational speed control requires a propeller speed governor that matches its interface. Typically, the propeller speed governor used to switch the oil circuit is achieved by cooperating with a complex electromagnet and a valve / sleeve that limits the blade angle. Then, through a complex pitch mechanism inside the propeller, the propeller blade angle is prevented from reaching too small an angle in the air, thus avoiding negative thrust. Such a complex mechanism not only increases manufacturing costs but also inevitably leads to a decrease in overall reliability.

[0003] Therefore, how to design a propeller pitch limiting system that is simple in structure, highly reliable, and has strong pitch controllability is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This invention provides a propeller pitch limiting system, which solves the technical problems of existing propeller pitch limiting devices being complex in structure, expensive in cost, and poor in stability.

[0005] The technical solution of this invention to solve the above-mentioned technical problems is as follows: a propeller pitch limiting system, comprising: a governor, a bushing, and a beta tube. The governor's housing has through-holes at both ends, and its sidewalls are provided with large-pitch oil holes and small-pitch oil holes at intervals. Both the large-pitch and small-pitch oil holes communicate with the mounting holes and with the governor's high-pressure lubricating oil supply chamber. The bushing is fixed inside the mounting holes and has large-pitch intermediate holes and small-pitch intermediate holes. The large-pitch intermediate holes communicate with the large-pitch oil holes, and the small-pitch intermediate holes communicate with the small-pitch oil holes. The bushing has closed rings between and on both sides of the large-pitch and small-pitch intermediate holes to define small-pitch oil supply areas communicating with the small-pitch intermediate holes between adjacent closed rings. The large-pitch oil supply area is connected to the large-pitch transfer hole; the beta tube is slidably installed on the three closed rings and one end of it is movably inserted through the bushing and fixed to the propeller. The inner hole of the beta tube is connected to the pitch-changing oil chamber of the propeller and its other end is a closed end. The beta tube wall is provided with small-pitch oil inlet and outlet holes and large-pitch oil inlet and outlet holes at intervals. The small-pitch oil inlet and outlet holes are connected to the small-pitch oil supply area, and the large-pitch oil inlet and outlet holes are connected to the large-pitch oil supply area, so that when the large-pitch oil inlet and outlet holes are supplied with oil, the small-pitch oil inlet and outlet holes are used for oil return, or when the small-pitch oil inlet and outlet holes are supplied with oil, the large-pitch oil inlet and outlet holes are used for oil return, thereby realizing the pitch change of the propeller.

[0006] The beneficial effects of this invention are as follows: It changes the traditional propeller pitch-changing structure by first connecting the large-pitch oil hole on the governor housing, the large-pitch transfer hole on the bushing, the large-pitch oil supply area, and the large-pitch inlet / outlet oil hole on the beta tube in sequence. Then, it connects the small-pitch oil hole on the governor housing, the small-pitch transfer hole on the bushing, the small-pitch oil supply area, and the small-pitch inlet / outlet oil hole on the beta tube in sequence. Since the beta tube is fixed to the propeller (the beta tube changes pitch synchronously with the propeller) and its inner hole is connected to the pitch-changing oil chamber of the propeller, and since the high-pressure lubricating oil supply chamber of the governor can distribute high-pressure lubricating oil, it can use the small-pitch inlet / outlet oil hole for oil return when supplying oil through the large-pitch inlet / outlet oil hole, thus achieving large-pitch propeller pitch change; conversely, it can use the large-pitch inlet / outlet oil hole for oil return when supplying oil through the small-pitch inlet / outlet oil hole, thus achieving small-pitch propeller pitch change. This simplifies the structure of the propeller pitch-changing system, reduces the manufacturing cost of the propeller pitch-changing system, and improves the reliability of the propeller pitch-changing system.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the small-pitch oil hole, the small-pitch transfer hole, and the small-pitch inlet / outlet oil hole are all arranged in a direction close to the propeller, and the closing ring close to the propeller can close the small-pitch inlet / outlet oil hole to position and limit the propeller from continuing to change pitch.

[0009] The further beneficial effect of adopting the above is that by arranging the small-pitch oil hole, the small-pitch transfer hole, and the small-pitch inlet and outlet oil hole all towards the direction close to the propeller, the small-pitch inlet and outlet oil hole can be sealed by the closed ring close to the propeller after the beta tube slides a certain distance towards the propeller, thus limiting the propeller's small-pitch variable pitch and realizing the propeller's small-pitch variable limited movement.

[0010] Furthermore, the large-distance oil hole, the large-distance transfer hole, the large-distance inlet / outlet oil hole, the small-distance oil hole, the small-distance transfer hole, and the small-distance inlet / outlet oil hole are all arranged in pairs opposite to each other.

[0011] Furthermore, it also includes multiple sealing rings, and the outer peripheral sidewall of the bushing is provided with sealing grooves at intervals. The multiple sealing rings are respectively fitted into the multiple sealing grooves and their outer peripheral sidewalls are in contact with the sealing adhesive of the hole wall of the mounting hole.

[0012] The further beneficial effect of adopting the above is that by using a sealing ring to seal the gap between the housing and the bushing, the sealing performance between the housing and the bushing can be improved, and high-pressure lubricating oil can be prevented from leaking through the gap between the housing and the bushing.

[0013] Furthermore, it also includes a positioning ring, wherein the inner wall of the mounting hole is provided with an annular positioning groove; the positioning ring is fitted onto the outer peripheral side wall of the bushing and extends into the positioning groove.

[0014] The further beneficial effect of adopting the above is that by using the positioning ring fixed to the outer peripheral side wall of the bushing to extend into the positioning groove, it is not only convenient to position and install the bushing, but also to improve the sealing between the housing and the bushing.

[0015] Furthermore, the diameters of the large-distance oil hole, the large-distance transfer hole, and the large-distance inlet / outlet oil hole are all 20–30 mm.

[0016] Furthermore, the diameters of the small-distance oil hole, the small-distance transfer hole, and the small-distance inlet / outlet oil hole are all 5 to 15 mm. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of a propeller variable pitch limiting system according to the present invention.

[0018] The attached diagram lists the components represented by each number as follows: 1. Housing; 11. Mounting hole; 12. Large-distance oil hole; 13. Small-distance oil hole; 2. Bushing; 21. Bushing; 22. Small-distance transfer hole; 3. Beta tube; 31. Large-distance inlet / outlet oil hole; 32. Small-distance inlet / outlet oil hole; 4. Sealing ring; 5. Sealing ring; 6. Positioning ring. Detailed Implementation

[0019] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] like Figure 1 As shown, a propeller pitch limiting system includes: a governor, a bushing 2, and a beta tube 3. The governor housing 1 has a through mounting hole 11 at both ends. The side wall of housing 1 has a large-pitch oil hole 12 and a small-pitch oil hole 13, both of which communicate with the high-pressure lubricating oil supply chamber of the governor. A bushing 2 is fixed inside the mounting hole 11 and has a large-pitch intermediate hole 21 communicating with the large-pitch oil hole 12 and a small-pitch intermediate hole 22 communicating with the small-pitch oil hole 13. A sealing ring 4 passes through the bushing 2 between the large-pitch intermediate hole 21 and the small-pitch intermediate hole 22, and on both sides, to define a small-pitch oil supply area communicating with the small-pitch intermediate hole 22 between adjacent sealing rings 4. The large-pitch oil supply area is connected to the large-pitch transfer hole 21; the beta tube 3 is sealed and slides within three closed rings 4, and one end of it moves through the bushing 2 and is fixed to the propeller. Its inner hole is connected to the pitch-changing oil chamber of the propeller, and its other end is a closed end. Large-pitch oil inlet and outlet holes 31 and small-pitch oil inlet and outlet holes 32 are provided at intervals on its tube wall. The large-pitch oil inlet and outlet hole 31 is connected to the large-pitch oil supply area, and the small-pitch oil inlet and outlet hole 32 is connected to the small-pitch oil supply area. When oil is supplied by the large-pitch oil inlet and outlet hole 31, the small-pitch oil inlet and outlet hole 32 is used for oil return, or when oil is supplied by the small-pitch oil inlet and outlet hole 32, the large-pitch oil inlet and outlet hole 31 is used for oil return, so as to realize the pitch change of the propeller.

[0021] In some specific embodiments, the small-pitch oil hole 13, the small-pitch transfer hole 22, and the small-pitch inlet and outlet oil hole 32 are all arranged in a direction close to the propeller, and the closing ring 4 close to the propeller can close the small-pitch inlet and outlet oil hole 32 to position and limit the propeller from continuing to change pitch.

[0022] In some specific embodiments, the large-distance oil hole 12, the large-distance transfer hole 21, the large-distance inlet / outlet oil hole 31, the small-distance oil hole 13, the small-distance transfer hole 22, and the small-distance inlet / outlet oil hole 32 can all be two oppositely arranged holes.

[0023] In some specific embodiments, multiple sealing rings 5 ​​may also be included. The outer peripheral sidewall of the bushing 2 is provided with sealing grooves at intervals. The multiple sealing rings 5 ​​are respectively fitted into the multiple sealing grooves and their outer peripheral sidewalls are in contact with the sealing adhesive of the hole wall of the mounting hole 11.

[0024] In some specific embodiments, a positioning ring 6 may also be included, and an annular positioning groove is provided on the inner wall of the mounting hole 11; the positioning ring 6 is fitted onto the outer peripheral side wall of the bushing 2 and extends into the positioning groove.

[0025] Specifically, the diameters of the large-distance oil hole 12, the large-distance transfer hole 21, and the large-distance inlet / outlet oil hole 31 can all be 20–30 mm.

[0026] Specifically, the diameters of the small-distance oil hole 13, the small-distance transfer hole 22, and the small-distance inlet / outlet oil hole 32 can all be 5 to 15 mm.

[0027] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A propeller variable pitch limiting system, characterized in that, include: Speed ​​regulator, the housing (1) of the speed regulator has an installation hole (11) that runs through both ends inside, and a large-distance oil hole (12) and a small-distance oil hole (13) are provided on the side wall of the housing (1). The large-distance oil hole (12) and the small-distance oil hole (13) are both connected to the high-pressure lubricating oil supply chamber of the speed regulator. A bushing (2) is inserted into the mounting hole (11) and has a large-distance transfer hole (21) communicating with the large-distance oil hole (12) and a small-distance transfer hole (22) communicating with the small-distance oil hole (13). The bushing (2) has a closed ring (4) between the large-distance transfer hole (21) and the small-distance transfer hole (22) and on both sides, so as to define a small-distance oil supply area communicating with the small-distance transfer hole (22) and a large-distance oil supply area communicating with the large-distance transfer hole (21) between the two adjacent closed rings (4). Beta tube (3), the beta tube (3) is sealed and slides within the three closed rings (4) and one end of it moves through the bushing (2) and is fixed to the propeller. Its inner hole is connected to the variable pitch oil chamber of the propeller, and its other end is a closed end. Large-pitch oil inlet and outlet holes (31) and small-pitch oil inlet and outlet holes (32) are provided at intervals on its tube wall. The large-pitch oil inlet and outlet holes (31) are connected to the large-pitch oil supply area, and the small-pitch oil inlet and outlet holes (32) are connected to the small-pitch oil supply area, so that the large-pitch oil inlet and outlet holes (31) are connected to the small-pitch oil supply area. 31) When supplying oil, the small-pitch oil inlet / outlet hole (32) is used for oil return, or when supplying oil through the small-pitch oil inlet / outlet hole (32), the large-pitch oil inlet / outlet hole (31) is used for oil return, thereby realizing the pitch change of the propeller; the small-pitch oil hole (13), the small-pitch transfer hole (22) and the small-pitch oil inlet / outlet hole (32) are all arranged in a direction close to the propeller and the closing ring (4) close to the propeller can close the small-pitch oil inlet / outlet hole (32) to position and limit the propeller from continuing to change pitch.

2. The propeller variable pitch limiting system according to claim 1, characterized in that, The large-distance oil hole (12), the large-distance transfer hole (21), the large-distance inlet / outlet oil hole (31), the small-distance oil hole (13), the small-distance transfer hole (22), and the small-distance inlet / outlet oil hole (32) are all arranged in pairs opposite to each other.

3. The propeller variable pitch limiting system according to claim 1, characterized in that, It also includes multiple sealing rings (5), and the outer peripheral sidewall of the bushing (2) is provided with sealing grooves at intervals. The multiple sealing rings (5) are respectively fitted in the multiple sealing grooves and their outer peripheral sidewalls are in contact with the sealing glue of the hole wall of the mounting hole (11).

4. The propeller variable pitch limiting system according to claim 1, characterized in that, It also includes a positioning ring (6), and the inner wall of the mounting hole (11) is provided with an annular positioning groove; the positioning ring (6) is fitted onto the outer peripheral side wall of the bushing (2) and extends into the positioning groove.

5. A propeller pitch limiting system according to claim 1, characterized in that, The diameters of the large-distance oil hole (12), the large-distance transfer hole (21), and the large-distance inlet / outlet oil hole (31) are all 20-30 mm.

6. A propeller variable pitch limiting system according to claim 1, characterized in that, The diameters of the small-pitch oil hole (13), the small-pitch transfer hole (22), and the small-pitch inlet / outlet oil hole (32) are all 5 to 15 mm.

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