阅读说明：本技术 一种螺旋桨桨叶桨根及桨根与桨毂的连接结构 (Propeller blade root and connection structure of propeller root and propeller hub ) 是由 王慧玲 蔡猛 姜雪肖 田书全 于 2021-01-06 设计创作，主要内容包括：本发明公开了一种螺旋桨桨叶桨根及桨根与桨毂的连接结构,叶柄头部为直径较大圆柱,后面依次是直径变小的圆台、直径最小圆柱、直径变大的圆台、过渡弧面和最大直径圆柱,较大直径圆柱上有外螺纹和键槽,另一端端面中心开锥型槽；在直径变大的圆台上沿叶柄的径向开连接通孔。位于桨根安装孔内的挡位块外端面有桨根头部的容纳孔；桨毂内套与推力轴承内套压接固定在一起；桨根穿越桨毂内套的内孔,头部由锁紧片和螺母Ⅰ锁紧固定在桨毂内套的里端壁上；螺栓穿在桨毂内套的固定孔和桨根的螺栓连接孔内,由螺母Ⅱ锁紧固定。本发明桨根结构简单,直径小,强度高,与桨毂连接结构简单,连接零部件少,连接强度高,制成的螺旋桨体积小、重量轻、强度高。(The invention discloses a propeller blade root of a propeller and a connection structure of the propeller root and a propeller hub.A blade handle head is a cylinder with a larger diameter, and a round table with a smaller diameter, a cylinder with a smallest diameter, a round table with a larger diameter, a transition arc surface and a cylinder with a largest diameter are sequentially arranged behind the blade handle head; and a connecting through hole is formed in the circular truncated cone with the enlarged diameter along the radial direction of the blade handle. The outer end face of the stop block positioned in the paddle root mounting hole is provided with a containing hole of the head part of the paddle root; the hub inner sleeve and the thrust bearing inner sleeve are fixedly connected together in a compression joint mode; the propeller root penetrates through an inner hole of the propeller hub inner sleeve, and the head part of the propeller root is locked and fixed on the inner end wall of the propeller hub inner sleeve through a locking sheet and a nut I; the bolt penetrates through the fixing hole of the hub inner sleeve and the bolt connecting hole of the propeller root and is locked and fixed by the nut II. The propeller root has the advantages of simple structure, small diameter, high strength, simple connection structure with the propeller hub, few connecting parts, high connection strength, small volume of the manufactured propeller, light weight and high strength.)

1. A propeller blade root comprises a composite material layer consisting of a blade handle, a foam core, a carbon beam and a skin; the method is characterized in that: the blade handle is an integral metal piece, one end of the head part is a cylinder with a larger diameter, then a section of circular truncated cone with a reduced diameter, then a section of cylinder with a minimum diameter, then a section of circular truncated cone with an enlarged diameter, and finally a section of cylinder with a maximum diameter, wherein a transition arc surface is arranged between the circular truncated cone with the enlarged diameter and the cylinder with the maximum diameter; the cylinder with the larger diameter at the head part is provided with external threads and a key groove at one end part, and the center of the end surface at the other end part is provided with a conical groove; a connecting through hole is formed in the diameter-enlarged circular truncated cone along the radial direction of the blade shank; the foam core is inserted in the petiole conical groove; the composite material layer is wrapped and fixed on the other parts of the petioles except the thread parts; the foam core and the composite material layer are provided with the same connecting holes communicated with the connecting through holes at the positions corresponding to the connecting through holes of the petioles; the connecting through hole and the connecting hole form a propeller root bolt connecting hole.

2. The propeller blade root of claim 1, wherein: the diameter of the transition cambered surface of the petiole is 50mm, and the length of the cylinder with the largest diameter is 5 mm.

3. The propeller blade root of claim 1 or 2, wherein: a transition arc surface A is arranged between the cylinder with the smallest diameter of the blade handle and the round table with the larger diameter.

4. A connection of a propeller blade root to a hub as claimed in claim 1, 2 or 3, wherein: the device comprises a stop block fixed on a propeller hub, a hoop fixed at a propeller root mounting hole of the propeller hub, a thrust bearing with an outer sleeve and an inner cavity wall of the hoop fixed together in a compression joint manner, a metal propeller hub inner sleeve, a nut I and a locking sheet matched with external threads of a propeller root blade handle for use, and a bolt and a nut II matched with a bolt connecting hole of the propeller root for use; the stop block is positioned in the propeller root mounting hole of the propeller hub, and the outer end surface of the stop block is provided with a containing hole of the head part of the propeller root; the outer circular surface of the inner sleeve of the metal propeller hub is fixedly connected with the inner sleeve of the thrust bearing in a compression joint mode; the inner hole of the hub inner sleeve is matched with the excircle of the propeller root, and the outer end part of the hub inner sleeve is provided with a through fixing hole at a position corresponding to the bolt connecting hole of the propeller root; the propeller root penetrates through an inner hole of the propeller hub inner sleeve, the head of the propeller root is locked and fixed on the inner end wall of the propeller hub inner sleeve through a locking sheet and a nut I which is in threaded connection with the external thread at the head of the propeller root, one of two wings of the locking sheet is bent and clamped on the nut I, and the other wing is bent and clamped in a key groove at the head of the propeller root; the bolt penetrates through the fixing hole of the hub inner sleeve and the bolt connecting hole of the propeller root and is locked and fixed by the nut II.

Technical Field

The invention relates to a propeller blade root and a connecting structure of the blade root and a propeller hub.

Background

The existing composite material paddle root is composed of a metal blade handle and a composite material wrapped inside and outside the metal blade handle, the metal blade handle is complex in structure due to the fact that the metal blade handle is connected with a paddle hub and needs to be manufactured through an RTM (resin transfer molding) forming process, the composite material needs to be paved in an inner cavity of the metal blade handle in the manufacturing process, technical requirements on a formed die are very high, the paving process is complex, the technical level of operators is required to be high, time and labor are wasted, and the cost is high. The paddle root is installed in a paddle hub, dozens of parts such as early warning nuts, filling blocks and a blade handle sleeve are needed for connection, the structure is very complex, the assembly process is troublesome, time and labor are wasted, and the efficiency is low. The outer diameter of the blade handle is large, so that the installation space of the propeller hub is large, the size of the propeller hub is large, the weight is heavy, and the whole weight of the propeller is large and the size is large.

Disclosure of Invention

The present invention aims to solve the above problems in the prior art, and provides a propeller blade root and a connection structure of the blade root and a propeller hub, wherein the blade root has the advantages of simple structure, small diameter, high strength, simple connection structure with the propeller hub, few connecting parts, high connection strength, small volume and light weight of the propeller hub, and the manufactured propeller has the advantages of small volume, light weight and high strength.

In order to realize the purpose of the invention, the technical solution of the invention is as follows: a propeller blade root comprises a composite material layer consisting of a blade handle, a foam core, a carbon beam and a skin; the blade handle is an integral metal piece, one end of the head part is a cylinder with a larger diameter, then a section of circular truncated cone with a reduced diameter, then a section of cylinder with a minimum diameter, then a section of circular truncated cone with an enlarged diameter, and finally a section of cylinder with a maximum diameter, wherein a transition arc surface is arranged between the circular truncated cone with the enlarged diameter and the cylinder with the maximum diameter; the cylinder with the larger diameter at the head part is provided with external threads and a key groove at one end part, and the center of the end surface at the other end part is provided with a conical groove; a connecting through hole is formed in the diameter-enlarged circular truncated cone along the radial direction of the blade shank; the foam core is inserted in the petiole conical groove; the composite material layer is wrapped and fixed on the other parts of the petioles except the thread parts; the foam core and the composite material layer are provided with the same connecting holes communicated with the connecting through holes at the positions corresponding to the connecting through holes of the petioles; the connecting through hole and the connecting hole form a propeller root bolt connecting hole.

Further preferably, the diameter of the transition arc surface of the petiole is 50mm, and the length of the cylinder with the largest diameter is 5 mm.

Further preferably, a transition arc surface a is arranged between the cylinder with the smallest diameter of the blade handle and the round table with the larger diameter.

In order to realize another purpose of the invention, the technical solution of the invention is as follows: a connecting structure adopting the blade root and the hub comprises a stop block fixed on the hub, a clamp fixed at a mounting hole of the blade root of the hub, a thrust bearing with an outer sleeve and an inner cavity wall of the clamp in a compression joint and fixed together, a metal inner hub sleeve, a nut I and a locking sheet matched with external threads of the blade root handle, and a bolt and a nut II matched with a bolt connecting hole of the blade root; the stop block is positioned in the propeller root mounting hole of the propeller hub, and the outer end surface of the stop block is provided with a containing hole of the head part of the propeller root; the outer circular surface of the inner sleeve of the metal propeller hub is fixedly connected with the inner sleeve of the thrust bearing in a compression joint mode; the inner hole of the hub inner sleeve is matched with the excircle of the propeller root, and the outer end part of the hub inner sleeve is provided with a through fixing hole at a position corresponding to the bolt connecting hole of the propeller root; the propeller root penetrates through an inner hole of the propeller hub inner sleeve, the head of the propeller root is locked and fixed on the inner end wall of the propeller hub inner sleeve through a locking sheet and a nut I which is in threaded connection with the external thread at the head of the propeller root, one of two wings of the locking sheet is bent and clamped on the nut I, and the other wing is bent and clamped in a key groove at the head of the propeller root; the bolt penetrates through the fixing hole of the hub inner sleeve and the bolt connecting hole of the propeller root and is locked and fixed by the nut II.

The metal blade handle of the blade root is only provided with the conical groove on the back end surface, the structure is simple, the strength is high, the diameter which can be manufactured is smaller, the composite material foam core is connected in the conical groove, the connection reliability is high, the transition cambered surface arranged at the back end part enables the carbon beam and the skin which are paved and fixed outside to be good in fixing stability and not easy to fall off, and particularly the carbon beam and the skin of which the front end is also provided with the transition cambered surface A are better in fixing stability. Because the root blade handle head has external screw thread and keyway, and the rear end has connect the through-hole, it can adopt simple clamp, thrust bearing, metal propeller hub endotheca, nut I and stay, bolt and nut II just can rotationally connect the root on the root mounting hole of propeller hub, keeps off the position by the fender position piece, and it is connected the reliability height, and joint strength is high, and connection structure is simple, and the connecting hole is little, has correspondingly reduced the volume and the quality of propeller hub.

In a word, the blade root of the invention has simple structure, small diameter, high strength, simple structure connected with the hub, few connecting parts, high connecting strength, small volume and light weight of the hub, and the manufactured propeller has small volume, light weight, high strength and good performance.

Drawings

FIG. 1 is a front cross-sectional view of a root of the present invention;

FIG. 2 is a front view of a petiole according to the present invention;

FIG. 3 is an enlarged front view of a petiole according to the present invention;

fig. 4 is a schematic view of the connection structure of the propeller root and the propeller hub in the invention.

Detailed Description

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

As shown in fig. 1 to 4, the propeller blade root of the present embodiment includes a composite material layer 3 composed of a blade shank 2, a foam core 4, a carbon beam, and a skin. The petiole 2 is an integral metal piece, and head one end is great diameter cylinder 7, is followed by a section of circular platform 8 that the diameter diminishes, is followed by a section of cylinder 9 that the diameter is minimum, is followed by a section of circular platform 10 that the diameter enlarges, is followed by a section of cylinder 13 that the diameter is the biggest at last, has transition cambered surface 12 between circular platform 10 that the diameter enlarges and cylinder 13 that the diameter is the biggest. The cylinder 7 with a larger diameter at the head part is provided with an external thread 1 and a key groove 6 at one end part, and the center of the end surface at the other end is provided with a tapered groove 11. The round platform 8 with the enlarged diameter is provided with a connecting through hole along the radial direction of the petiole. The foam core 4 is inserted in the petiole conical groove 11. The composite material layer 3 is wrapped and fixed on the other parts of the petiole 2 except the threaded part. The foam core and the composite material layer 3 are provided with the same connecting holes communicated with the connecting through holes at the positions corresponding to the connecting through holes of the blade handles 2, and the connecting through holes and the connecting holes form a blade bolt connecting hole 5. Preferably, the transition arc 12 of the petiole 2 has a diameter of 50mm and the cylinder 13 of its largest diameter is 5mm long. Preferably, a transition arc surface A23 is arranged between the cylinder 9 with the smallest diameter and the round table 10 with the larger diameter of the petiole 2.

The connecting structure of the blade root 25 and the hub 14 comprises a stop block 15 fixed on the hub 14, a clamp 17 fixed at a hub root mounting hole, a thrust bearing 18 with an outer sleeve fixed with the inner cavity wall of the clamp 17 in a compression joint mode, a metal hub inner sleeve 21, a nut I22 and a locking sheet 16 matched with the external thread 1 of the blade root handle 2, and a bolt 19 and a nut II 20 matched with the bolt connecting hole 5 of the blade root 25. The stop block 15 is located in the hub root mounting hole and has a root head receiving hole 24 on the outer end surface. The outer circular surface of the metal hub inner sleeve 21 and the thrust bearing 18 inner sleeve are fixedly connected together in a compression joint mode. The inner hole of the hub inner sleeve 21 is matched with the excircle of the propeller root 25, and the outer end part of the hub inner sleeve is provided with a through fixing hole at the position corresponding to the bolt connecting hole 5 of the propeller root. The propeller root 25 penetrates through an inner hole of the propeller hub inner sleeve 21, the head of the propeller root is locked and fixed on the inner end wall of the propeller hub inner sleeve 21 through a locking sheet 16 and a nut I22 which is in threaded connection with the external thread of the propeller root head, one of two wings of the locking sheet 16 is bent and clamped on the nut I22, and the other wing is bent and clamped in a key groove 6 at the head of the propeller root 25. The bolt 19 penetrates through the fixing hole of the hub inner sleeve 21 and the bolt connecting hole 5 of the propeller root and is locked and fixed by the nut II 20.

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.