阅读说明：本技术 一种前后桨连接装置 (Front and rear paddle connecting device ) 是由 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：本发明公开了一种前后桨连接装置,前桨轴前端圆角过渡延伸成法兰盘,该法兰盘通过固定在前桨上的多个螺栓和螺母固定在前桨上；前桨轴中部加工有前桨轴滚道,连接套内孔加工有连接套滚道,前桨轴滚道和连接套滚道上分别有与钢球个数相同的合在一起形成钢球一个完整滚珠滚道槽的滚珠滚道槽A和滚珠滚道槽B；连接套通过位于滚珠滚道槽A和B内的多个钢球可旋转地装配在前桨轴上；预紧螺母螺纹拧紧固定在前桨轴法兰盘一端；连接套后端为一法兰盘,该法兰盘通过多个螺钉固定在后桨上。本发明对前桨的支撑力度大,固定效果稳固,大大减少了前桨脱离后桨的风险。(The invention discloses a front and rear paddle connecting device.A circular angle at the front end of a front paddle shaft is transited and extended to form a flange plate, and the flange plate is fixed on the front paddle through a plurality of bolts and nuts fixed on the front paddle; the middle part of the front paddle shaft is provided with a front paddle shaft raceway, the inner hole of the connecting sleeve is provided with a connecting sleeve raceway, and the front paddle shaft raceway and the connecting sleeve raceway are respectively provided with a ball raceway groove A and a ball raceway groove B which have the same number as the steel balls and are combined together to form a complete ball raceway groove of the steel balls; the connecting sleeve is rotatably assembled on the front paddle shaft through a plurality of steel balls positioned in the ball rolling groove A and the ball rolling groove B; the pre-tightening nut is screwed and fixed at one end of the front propeller shaft flange plate; the rear end of the connecting sleeve is a flange plate which is fixed on the rear paddle through a plurality of screws. The front propeller fixing device has large supporting force on the front propeller, stable fixing effect and greatly reduced risk of the front propeller separating from the rear propeller.)

1. A front and rear paddle connecting device is characterized in that: the device comprises a front propeller shaft, a pretightening nut, a connecting sleeve and a plurality of steel balls; the front end circular angle of the front paddle shaft is transited and extended to form a flange plate, and the flange plate is fixed on the front paddle through a plurality of bolts and nuts fixed on the front paddle; the middle part of the front paddle shaft is provided with a front paddle shaft raceway, the inner hole of the connecting sleeve is provided with a connecting sleeve raceway, and the front paddle shaft raceway and the connecting sleeve raceway are respectively provided with a ball raceway groove A and a ball raceway groove B which have the same number as the steel balls and are combined together to form a complete ball raceway groove of the steel balls; the connecting sleeve is rotatably assembled on the front paddle shaft through a plurality of steel balls positioned in the ball rolling groove A and the ball rolling groove B; the pre-tightening nut is screwed and fixed at one end of the front propeller shaft flange plate and is in clearance fit with the connecting sleeve in a relatively rotating way; the rear end of the connecting sleeve is a flange plate which is fixed on the rear paddle through a plurality of screws.

2. The front and rear paddle connection of claim 1, wherein: through holes which are communicated with the ball rolling groove B and have the same number with the steel balls are arranged on the peripheral wall of the connecting sleeve.

Technical Field

The invention relates to a connecting device for front and rear propellers of a coaxial contra-rotating propeller.

Background

The propeller is a device for converting the power of an engine into a pulling force, and is a preferred propulsion system in aircraft design due to its economic and safety advantages. The single-row propeller has small thrust and low efficiency, and can not meet the development requirements of modern airplanes. The coaxial contra-rotating propellers eliminate reaction moment and gyroscopic moment, improve the use performance of the aircraft, reduce air rotational flow behind the propellers, the rear propellers are rotatably assembled on the front propellers, and the rotating kinetic energy generated by the front propellers can be absorbed by the rear propellers to form forward thrust acting on the blade surfaces of the propellers, so that the thrust and the efficiency of the propellers are improved. Due to the double rows of propellers, the front propeller shaft is too long, the propeller shaft is easy to bend, and the use of the propellers is affected. Meanwhile, the pulling force provided by the front propeller makes the front propeller to be separated from the rear propeller, so that the design of a coaxial contra-rotating propeller front and rear propeller connecting device is very necessary.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provide a connecting device for front and rear paddles, which has large supporting force on the front paddles and stable fixing effect and greatly reduces the risk of the front paddles separating from the rear paddles.

In order to achieve the purpose, the technical solution of the invention is as follows: a front and rear paddle connecting device comprises a front paddle shaft, a pre-tightening nut, a connecting sleeve and a plurality of steel balls; the front end circular angle of the front paddle shaft is transited and extended to form a flange plate, and the flange plate is fixed on the front paddle through a plurality of bolts and nuts fixed on the front paddle; the middle part of the front paddle shaft is provided with a front paddle shaft raceway, the inner hole of the connecting sleeve is provided with a connecting sleeve raceway, and the front paddle shaft raceway and the connecting sleeve raceway are respectively provided with a ball raceway groove A and a ball raceway groove B which have the same number as the steel balls and are combined together to form a complete ball raceway groove of the steel balls; the connecting sleeve is rotatably assembled on the front paddle shaft through a plurality of steel balls positioned in the ball rolling groove A and the ball rolling groove B; the pre-tightening nut is screwed and fixed at one end of the front propeller shaft flange plate and is in clearance fit with the connecting sleeve in a relatively rotating way, so that radial clearances among the front propeller shaft raceway, each steel ball and the connecting sleeve raceway and axial clearances of a bearing are eliminated; the rear end of the connecting sleeve is a flange plate which is fixed on the rear paddle through a plurality of screws.

Further preferably, through holes which are the same as the number of the steel balls and are communicated with the ball rolling grooves B are formed in the peripheral wall of the connecting sleeve. The installation of the steel ball is convenient, the pre-tightening nut eliminates the axial clearance of the bearing, and the steel ball is ensured not to be separated.

The front propeller is supported and fixed through the front propeller shaft and the connecting sleeve, so that the supporting force on the front propeller is large, and the fixing effect is stable. When the front paddle works, the generated pulling force acts on the connecting sleeve through the steel ball, so that the front paddle is prevented from being separated, and the risk that the front paddle is separated from the rear paddle is greatly reduced.

Drawings

FIG. 1 is a schematic structural diagram 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 a front propeller shaft 2, a pre-tightening nut 3, a connecting sleeve 4 and a plurality of steel balls 5. The front end of the front paddle shaft 2 is in a fillet transition and extends to form a flange plate, and the flange plate is fixed on the front paddle 1 through 16 (14, 15, 17, 18 and the like) bolts 7 and nuts 8 fixed on the front paddle 1. The middle part of the front paddle shaft 2 is provided with a front paddle shaft roller path, the inner hole of the connecting sleeve 4 is provided with a connecting sleeve roller path, and the front paddle shaft roller path and the connecting sleeve roller path are respectively provided with a ball roller path groove A and a ball roller path groove B which have the same number as 5 steel balls and are combined together to form a complete ball roller path groove of the steel balls. The connecting sleeve 4 is rotatably fitted on the front paddle shaft 2 by a plurality of steel balls 5 located in ball raceway grooves a and B. The pre-tightening nut 3 is screwed and fixed at one end of the flange of the front propeller shaft 2, and radial play among the front propeller shaft raceway, each steel ball 5 and the connecting sleeve raceway is eliminated. The rear end of the connecting sleeve 4 is a flange which is fixed on the rear paddle 6 through a plurality of screws 9. Preferably, through holes which are the same as the number of the steel balls 5 and are communicated with the ball rolling grooves B are formed in the peripheral wall of the connecting sleeve 4, so that the steel balls can be conveniently installed.

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.