阅读说明：本技术 一种螺旋桨变距连杆机构 (Propeller variable pitch link mechanism ) 是由 汤斯佳 蔡猛 王慧玲 王金利 李桃 李媛媛 于 2020-11-20 设计创作，主要内容包括：本发明公开了一种螺旋桨变距连杆机构,包括连杆和球形滑块；连杆小端铰接连接在活塞末端上,其大端铰接连接在桨叶偏心销上；活塞通过花键可滑动地连接在导轨上；桨叶偏心销偏心固定在桨叶的端面上。本发明适应活塞圆周方向制造公差带来的角度变化性能强,防止了零件干涉和运动卡滞,磨损变缓,延长了使用寿命,降低了使用成本。(The invention discloses a propeller variable pitch connecting rod mechanism, which comprises a connecting rod and a spherical sliding block, wherein the connecting rod is connected with a propeller; the small end of the connecting rod is hinged to the tail end of the piston, and the large end of the connecting rod is hinged to the eccentric pin of the paddle; the piston is connected to the guide rail in a sliding way through a spline; the eccentric pin of the paddle is eccentrically fixed on the end surface of the paddle. The invention has strong performance of adapting to the angle change caused by the manufacturing tolerance in the circumferential direction of the piston, prevents the interference and the movement clamping stagnation of parts, slows down the abrasion, prolongs the service life and reduces the use cost.)

1. A propeller variable pitch link mechanism is characterized in that: it comprises a connecting rod and a spherical sliding block; the small end of the connecting rod is hinged to the tail end of the piston of the hydraulic cylinder, and the large end of the connecting rod is hinged to the eccentric pin of the paddle; the hydraulic cylinder piston is slidably connected to a guide rail in the propeller hub through a spline; the eccentric pin of the paddle is eccentrically fixed on the end surface of the paddle.

2. The propeller pitch link mechanism of claim 1, wherein: the small end of the connecting rod is flat, the middle part of the connecting rod is provided with a through hole, the connecting rod is arranged in the groove of the piston, and the connecting rod penetrates through the piston and the through hole at the small end of the connecting rod through a positioning pin so as to be connected with the piston.

3. A propeller pitch link mechanism according to claim 1 or 2, wherein: the big end of the connecting rod is flat, the middle part of the connecting rod is provided with a spherical inner hole, and a spherical sliding block matched with the spherical inner hole for use is rotatably arranged in the spherical inner hole; two grooves with the depth larger than that of the spherical inner hole are symmetrically arranged at two ends of the spherical inner hole; the middle part of the spherical sliding block is provided with a through hole, and the paddle eccentric pin is rotatably arranged in the through hole in the middle part of the spherical sliding block.

4. A propeller pitch link mechanism according to claim 3, wherein: the roughness of the spherical inner hole of the connecting rod and the surface of the spherical sliding block is not lower than 0.1.

5. A propeller pitch link mechanism according to claim 1 or 2, wherein: the roughness of the spherical inner hole of the connecting rod and the surface of the spherical sliding block is not lower than 0.1.

Technical Field

The invention relates to a propeller variable pitch connecting rod mechanism.

Background

The variable pitch propeller needs the blades to change the angle, the rotation of the blade angle is circular motion, and the driving force is piston linear motion, so that a connecting rod is needed to be connected between the piston linear motion and the blade circular motion to form a crank connecting rod mechanism. The piston and the guide rail in the propeller hub are prevented from rotating circumferentially through splines, the existing connecting rod mechanism is poor in performance of adapting to angle changes caused by manufacturing tolerance in the circumferential direction of the piston, parts are interfered and movement clamping stagnation phenomena frequently occur, the connecting rod mechanism is seriously abraded, the service life is short, and once the connecting rod mechanism is seriously abraded and cannot be used, the connecting rod mechanism needs to be integrally replaced, and the use cost of the connecting rod mechanism is high.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provide a propeller variable-pitch connecting rod mechanism which has strong performance of adapting to angle change caused by manufacturing tolerance in the circumferential direction of a piston, prevents parts from interfering and moving and clamping stagnation, reduces abrasion, prolongs the service life and reduces the use cost.

In order to achieve the purpose, the technical solution of the invention is as follows: a propeller variable pitch link mechanism comprises a connecting rod and a spherical sliding block; the small end of the connecting rod is hinged to the tail end of the piston of the hydraulic cylinder, and the large end of the connecting rod is hinged to the eccentric pin of the paddle; the hydraulic cylinder piston is slidably connected to a guide rail in the propeller hub through a spline; the eccentric pin of the paddle is eccentrically fixed on the end surface of the paddle.

Further preferably, the small end of the connecting rod is flat, the middle part of the connecting rod is provided with a through hole, the connecting rod is arranged in the groove of the piston, and the connecting rod is connected with the piston by a positioning pin penetrating through the piston and the through hole at the small end of the connecting rod.

Further preferably, the big end of the connecting rod is flat, the middle part of the connecting rod is provided with a spherical inner hole, and a spherical sliding block matched with the spherical inner hole is rotatably arranged in the spherical inner hole; two grooves with the depth larger than that of the spherical inner hole are symmetrically arranged at two ends of the spherical inner hole; the middle part of the spherical sliding block is provided with a through hole, and the paddle eccentric pin is rotatably arranged in the through hole in the middle part of the spherical sliding block.

Further preferably, the roughness of the surfaces of the spherical inner hole of the connecting rod and the spherical sliding block is not lower than 0.1. The normal work of the connecting rod assembly is better ensured.

Due to the adoption of the scheme, the connecting rod is driven to move along with the linear reciprocating of the piston, and finally the connecting rod is converted into the circular motion of the eccentric pin of the paddle. In the process, the small end of the connecting rod can rotate around the positioning pin, and the large end of the connecting rod can rotate around the eccentric pin of the blade. Wherein, the spherical slider cooperates with the spherical hole of connecting rod main aspects, forms 360 all around rotations, can adapt to because of the circumferencial direction's of piston, guide rail spline cooperation department tolerance, prevents that the part from interfering and the motion jamming, and wearing and tearing are slowed down, have prolonged life. The abrasion is particularly serious at the connecting position of the eccentric pin of the blade along with the inevitable abrasion of mechanical matching, the abrasion is reduced because the eccentric pin of the blade is connected with the connecting rod through the spherical sliding block, the abrasion is reduced, the whole connecting rod does not need to be replaced after the abrasion is finished, and the use requirement can be met only by preparing and replacing the spherical sliding block, so the use cost is reduced.

Drawings

FIG. 1 is a schematic view of a variable pitch propeller configuration;

FIG. 2 is a schematic view showing the internal structure of a connecting rod and a spherical slider in the present invention;

FIG. 3 is a front view of the connecting rod of the present invention;

FIG. 4 is a cross-sectional view AA in FIG. 3;

FIG. 5 is a front view of a spherical slider in accordance with the present invention;

fig. 6 is a BB cross-sectional view of fig. 5.

Detailed Description

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

As shown in fig. 1 to 6, the present embodiment includes a link 1 and a spherical slider 6. The small end 51 of the connecting rod 1 is hinged on the end of the piston 3, and the large end 52 thereof is hinged on the blade eccentric pin 2. Preferably, the connecting rod 1 has a flat small end 51 and a through hole 53 in the middle, and is mounted in a groove of the piston 3 and connected with the piston 3 by a positioning pin 7 passing through the piston 3 and the through hole 53 in the small end. Preferably, the big end 52 of the connecting rod 1 is flat, the middle part is provided with a spherical inner hole 54, and the spherical sliding block 6 matched with the spherical inner hole 54 is rotatably arranged in the spherical inner hole 54; two grooves 55 with the depth larger than that of the spherical inner hole 54 are symmetrically arranged at two ends of the spherical inner hole 54; the middle part of the spherical sliding block 6 is provided with a through hole, and the paddle eccentric pin 2 is rotatably arranged in the through hole in the middle part of the spherical sliding block. Preferably, the surface roughness of the spherical inner hole 54 of the connecting rod and the spherical sliding block 6 is not lower than 0.1. The piston 3 is slidable on the hub guide 4 by means of splines. The blade eccentric pin 2 is eccentrically fixed on the end surface of the blade.

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.