CN112429202A

CN112429202A - Slow-speed vehicle state propeller short-distance limiting mechanism

Info

Publication number: CN112429202A
Application number: CN202011316007.6A
Authority: CN
Inventors: 汤斯佳; 郝丽; 张鹤方; 陈双双; 王喜乐
Original assignee: AVIC Huiyang Aviation Propeller Co Ltd
Current assignee: AVIC Huiyang Aviation Propeller Co Ltd
Priority date: 2020-11-22
Filing date: 2020-11-22
Publication date: 2021-03-02

Abstract

The invention discloses a small-distance limiting mechanism of a propeller in a slow-speed vehicle state.A support plate is sleeved outside a propeller shell at one end far away from a propeller piston and is fixed on the propeller shell, and through holes I of various variable-pitch rods are uniformly formed in the support plate; the guide sleeve component is sleeved and fixed in the through hole I of the support plate; the guide clamping ring is fixed on the excircle of the other end of the propeller shell; a piston boss with a through hole II of a variable pitch rod is protruded on the propeller piston; the small-distance stop nut is fixed on the variable-distance rod; the variable-pitch rod penetrates through the guide sleeve assembly, the guide clamping ring and the through hole II of the piston boss, one end of the support plate is fixed on a low-pitch stop ring penetrating outside the propeller shaft, and the other end of the support plate is fixed on a rod end ring penetrating on the excircle of the propeller piston; the spring penetrates through the variable-pitch rod and is positioned between the guide sleeve assembly and the guide clamping ring; the small-distance stop nut is arranged between the piston boss and the rod end ring; the carbon block assembly is placed in the U-shaped ring groove of the low distance stop ring. The invention has simple structure, light weight, small volume and high protection reliability.

Description

Slow-speed vehicle state propeller short-distance limiting mechanism

Technical Field

The invention relates to a small-distance limiting mechanism for a propeller in a slow vehicle state.

Background

A gear pump in the JST-2 speed regulator rotates at a high speed to provide variable-pitch high-pressure oil for a forward variable-pitch propeller. In order to ensure that the propeller has a small-distance limiting function, a small-distance stopping mechanism, namely a fixed-distance protection mechanism needs to be arranged, when the propeller changes from feathering to small distance to a certain blade angle alpha, the propeller stops at about 18 degrees of the small-distance angle, and the small distance cannot be changed continuously, namely the propeller stops at a preset blade angle, so that the propeller is prevented from flying and rotating, and the flight safety is influenced. The front propeller is protected at a fixed distance by adopting a terminal surface tooth meshing mechanism, the terminal surface tooth meshing mechanism is complex in structure, the size and the weight of the propeller are increased, and the using requirements of aircrafts such as airplanes and the like cannot be met.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provide the small-distance limiting mechanism for the propeller in the slow-speed vehicle state, which has the advantages of simple structure, light weight, small volume and high protection reliability.

In order to achieve the purpose, the technical solution of the invention is as follows: a small-distance limiting mechanism of a propeller in a slow turning state comprises at least two variable-pitch rods, a support plate, a guide sleeve assembly, a spring, a guide clamping ring, a low-distance stop ring with a U-shaped ring groove on the excircle, a small-distance stop nut, a piston boss, a rod end ring, a carbon block assembly of the propeller and a beta valve assembly of a speed regulator; the support plate is sleeved outside the propeller shell at one end far away from the propeller piston and fixed on the propeller shell, and through holes I of all the variable pitch rods are uniformly formed in the support plate; the guide sleeve component is sleeved and fixed in the through hole I of the support plate; the guide clamping ring is fixed on the excircle of the other end of the propeller shell; a piston boss protrudes out of the propeller piston, and a through hole II of the variable pitch rod is formed in the piston boss; the centers of the guide sleeve assembly, the guide clamping ring and the through hole II on the piston boss are on the same axis; the small-distance stop nut is fixed on the variable-distance rod; the variable-pitch rod penetrates through a through hole II of the guide sleeve assembly, the guide clamping ring and the piston boss, one end of the support plate is fixed on a low-pitch stop ring penetrating outside the propeller shaft, and the other end of the support plate is fixed on a rod end ring penetrating on the outer circle of the propeller piston; the spring penetrates through the variable-pitch rod and is positioned between the guide sleeve assembly and the guide clamping ring; the small-distance stop nut is arranged between the piston boss and the rod end ring; the carbon block assembly is arranged in the U-shaped ring groove of the low-distance stop ring, and the left end surface of the carbon block assembly abuts against the wall of the U-shaped ring groove at the initial installation position; the piston rod of the beta valve assembly is connected with the carbon block assembly through a reverse paddle lever in hinged connection.

Preferably, the low-distance stop ring is provided with a connecting disc on the outer wall of one end of the support plate, the connecting disc is provided with a thickening bulge at the fixing position of the variable-distance rod, the connecting disc is provided with a threaded hole matched with the thread at the end of the variable-distance rod at the thickening bulge, and the end of the variable-distance rod is in threaded connection with the threaded hole of the connecting disc and is locked and fixed by a locking nut I. The structure is simple and reliable in fixation and easy to disassemble.

Further preferably, the other end of the pitch rod is fixed on a rod end ring penetrating through the outer circle of the propeller piston, and the structure is as follows: and a through hole III is formed in the corresponding position of the rod end ring, the variable-pitch rod penetrates through the through hole III, and the rod end ring is clamped and fixed by a thin gear nut and a locking nut II which are fixed on the variable-pitch rod through threads. The structure is simple and reliable in fixation and easy to disassemble.

When the blade angle of the propeller is reduced to alpha angle, the piston of the propeller drives the boss of the piston to abut against the small-distance stop nut on the variable-distance rod, the propeller continues to be reduced in distance, the piston drives the small-distance stop nut, the variable-distance rod and the low-distance stop ring to move together in the small-distance direction, the low-distance stop ring drives the carbon block assembly to move, the beta valve moves under the action of the movement of the carbon block and the elastic force of the return spring, and the boss on the beta valve closes the oil circuit, so that the blade angle of the propeller is automatically maintained at a certain blade angle. The invention realizes the distance protection function by arranging the propeller control oil circuit, only the beta valve is provided with a structure for sensing the change of the small pitch angle of the propeller, once the variable pitch of the propeller reaches the small pitch angle, the beta valve moves to block the small pitch oil inlet of the propeller, so that the propeller is spaced and the protection function is achieved. The invention has simple structure, light weight, small volume and high protection reliability, and completely meets the requirement of the propeller on light development.

Drawings

Fig. 1 is a schematic view of the mounting structure of the present invention.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

As shown in fig. 1, the present embodiment includes three (two, four, etc., preferably three) pitch rods 7, a support plate 16, a guide sleeve assembly 17, a spring 20, a guide snap ring 8, a low-distance stop ring 15 with a U-shaped ring groove 21 on the outer circle, a small-distance stop nut 10, a piston boss 9, a rod end ring 13, a carbon block assembly 19 of a propeller 6, and a beta valve assembly 5 of a governor 1. The support plate 16 is sleeved outside the propeller shell 14 at one end far away from the propeller piston 22 and fixed on the propeller shell 14, and through holes I of the variable pitch rods 7 are uniformly formed in the support plate. The guide sleeve assembly 17 is sleeved and fixed in the through hole I of the support plate 16. The guide snap ring 8 is fixed on the excircle of the other end of the propeller shell 14. A piston boss 9 protrudes from the propeller piston 22, and a through hole II of the variable pitch rod 7 is formed in the piston boss 9. The centers of the through holes II on the guide sleeve assembly 17, the guide clamping ring 8 and the piston boss 9 are on the same axis. The short distance stop nut 10 is fixed on the variable distance rod 7. The variable-pitch rod 7 penetrates through a through hole II of the guide sleeve assembly 17, the guide clamping ring 8 and the piston boss 9, one end of the support plate 16 is fixed on a low-pitch stop ring 15 penetrating outside a propeller shaft, and the other end of the support plate is fixed on a rod end ring 13 penetrating on the excircle of the propeller piston 22. The spring 20 is threaded on the variable pitch rod 7 and is positioned between the guide sleeve assembly 17 and the guide clamping ring 8. A small distance stop nut 10 is between the piston boss 9 and the rod end ring 13. The carbon block assembly 19 is placed in the U-shaped ring groove 21 of the low-distance stop ring 19, and the left end face of the carbon block assembly is abutted against the wall of the U-shaped ring groove 21 in the initial installation position. The piston rod 23 of the beta valve assembly 5 is connected with the carbon block assembly 19 through the reverse paddle lever 3 in hinged connection. And 4, a return spring in the beta valve assembly 5. Preferably, the low-distance stop ring 15 is provided with a connecting disc 24 on the outer wall of one end of the support plate 16, the connecting disc 24 is provided with a thickening bulge at the fixing position of the variable-distance rod 7, the connecting disc 24 is provided with a threaded hole matched with the thread at the end of the variable-distance rod 7 at the thickening bulge, and the end of the variable-distance rod 7 is in threaded connection with the threaded hole of the connecting disc 24 and is locked and fixed by a locking nut I18. Preferably, the other end of the pitch rod 7 is fixed on the rod end ring 13 penetrating the outer circle of the propeller piston 22, and the structure is as follows: and a through hole III is formed in the corresponding position of the rod end ring 13, the variable-pitch rod 7 penetrates through the through hole III, and the rod end ring 13 is clamped and fixed by a gear hexagonal thin nut 1 and a locking nut II 12 which are fixed on the variable-pitch rod 7 through threads. And 2 is a power push-pull rod.

There are, of course, many other embodiments of the invention and modifications and variations of this invention that will be obvious to those skilled in the art may be made without departing from the spirit and scope of the invention, but it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention.

Claims

1. The utility model provides a slow-moving vehicle state screw short-distance stop gear which characterized in that: the device comprises at least two variable-pitch rods, a support plate, a guide sleeve assembly, a spring, a guide clamping ring, a low-pitch stop ring with a U-shaped ring groove on the excircle, a small-pitch stop nut, a piston boss, a rod end ring, a carbon block assembly of a propeller and a beta valve assembly of a speed regulator; the support plate is sleeved outside the propeller shell at one end far away from the propeller piston and fixed on the propeller shell, and through holes I of all the variable pitch rods are uniformly formed in the support plate; the guide sleeve component is sleeved and fixed in the through hole I of the support plate; the guide clamping ring is fixed on the excircle of the other end of the propeller shell; a piston boss protrudes out of the propeller piston, and a through hole II of the variable pitch rod is formed in the piston boss; the centers of the guide sleeve assembly, the guide clamping ring and the through hole II on the piston boss are on the same axis; the small-distance stop nut is fixed on the variable-distance rod; the variable-pitch rod penetrates through a through hole II of the guide sleeve assembly, the guide clamping ring and the piston boss, one end of the support plate is fixed on a low-pitch stop ring penetrating outside the propeller shaft, and the other end of the support plate is fixed on a rod end ring penetrating on the outer circle of the propeller piston; the spring penetrates through the variable-pitch rod and is positioned between the guide sleeve assembly and the guide clamping ring; the small-distance stop nut is arranged between the piston boss and the rod end ring; the carbon block assembly is arranged in the U-shaped ring groove of the low-distance stop ring, and the left end surface of the carbon block assembly abuts against the wall of the U-shaped ring groove at the initial installation position; the piston rod of the beta valve assembly is connected with the carbon block assembly through a reverse paddle lever in hinged connection.

2. The slow vehicle state propeller fine pitch limiting mechanism of claim 1, wherein: the low-distance stop ring is provided with a connecting disc on the outer wall of one end of the support plate, the connecting disc is provided with a thickening bulge at the fixing position of the variable-distance rod, the connecting disc is provided with a threaded hole matched with the thread at the end of the variable-distance rod at the thickening bulge, and the end of the variable-distance rod is in threaded connection with the threaded hole of the connecting disc and is locked and fixed by a locking nut I.

3. The slow vehicle state propeller short distance limiting mechanism of claim 1 or 2, characterized in that: the other end of the variable pitch rod is fixed on a rod end ring penetrating through the excircle of the propeller piston, and the structure is as follows: and a through hole III is formed in the corresponding position of the rod end ring, the variable-pitch rod penetrates through the through hole III, and the rod end ring is clamped and fixed by a thin gear nut and a locking nut II which are fixed on the variable-pitch rod through threads.