CN-121977010-A - Carbon fiber composite material transmission shaft, forming die and forming method thereof

CN121977010ACN 121977010 ACN121977010 ACN 121977010ACN-121977010-A

Abstract

The invention discloses a carbon fiber transmission shaft, a forming die and a forming method thereof, and relates to the field of carbon fiber composite materials. The carbon fiber transmission shaft comprises a transmission shaft body and shaft heads, wherein the transmission shaft body is made of carbon fiber composite materials and is tubular, the shaft heads are arranged in cavities at two ends of the transmission shaft body, the shaft heads are made of metal or alloy and are tubular, the shaft heads and the transmission shaft body are reversely buckled and matched, and the shaft heads and the transmission shaft body are integrally formed through co-solidification. The forming die and the forming method can realize the reverse-buckling connection and co-curing integrated forming of the transmission shaft body and the shaft head, avoid the defects caused by back connection and back connection which are not opened by the transmission shaft of the carbon fiber composite material in the prior art, improve the connection strength of the transmission shaft of the carbon fiber composite material, optimize the dynamic balance of the transmission shaft and improve the production efficiency.

Inventors

SHEN ZHIJIE
GU YONGTAO
YU WENJUN

Assignees

江苏亨睿弗劳恩新材料研发有限公司

Dates

Publication Date: 20260505
Application Date: 20260409

Claims (10)

1. The carbon fiber composite material transmission shaft comprises a transmission shaft body and shaft heads arranged at two ends of the transmission shaft body, and is characterized in that the transmission shaft body is made of carbon fiber composite materials and is tubular, the shaft heads are made of metal or alloy and are tubular and inscribed in cavities at two ends of the transmission shaft body, the shaft heads and the transmission shaft body are reversely buckled and matched, and the shaft heads and the transmission shaft body are co-cured integrated parts.
2. The transmission shaft of the carbon fiber composite material according to claim 1, wherein the transmission shaft body comprises a middle section and shaft head connecting sections at two ends, the outer diameter and the inner diameter of the middle section are constant, the outer diameter and the inner diameter of the shaft head connecting sections gradually decrease from one end close to the middle section to one end far from the middle section, the shaft head comprises a shaft head first connecting section and a shaft head second connecting section, the shaft head first connecting section is connected with the shaft head connecting sections in a matched mode, the outer diameter of the shaft head first connecting section gradually increases from one end close to the shaft head second connecting section to one end far from the shaft head second connecting section, the outer diameter of the shaft head first connecting section is matched with the inner diameter of the shaft head connecting section in a matched mode, the outer diameter and the inner diameter of the shaft head second connecting section are constant, and the inner diameters of the shaft head first connecting section and the shaft head second connecting section are equal.
3. A carbon fiber composite drive shaft as defined in claim 2, wherein the first connection section of the stub shaft is provided with an anchor bump.
4. A carbon fiber composite drive shaft according to claim 2, wherein an R-angle transition is provided between the intermediate section of the drive shaft body and the stub shaft connection section.
5. A carbon fiber composite drive shaft as defined in claim 2, wherein the second connection section of the stub shaft is provided with a connection structure.
6. The carbon fiber composite drive shaft of claim 1, wherein the inner wall of the shaft head is provided with a first slot in the axial direction.
7. A forming die for a carbon fiber composite material transmission shaft is characterized by comprising a shaft sleeve and mandrels respectively arranged in two end cavities of the shaft sleeve, wherein the mandrels comprise first mandrel connecting sections and second mandrel connecting sections, the first mandrel connecting sections are arranged in the cavities of the end parts of the shaft sleeve, shaft heads are sleeved on the second mandrel connecting sections, the mandrels are fixed relative to the shaft sleeve, the shaft heads are fixed relative to the shaft sleeve, the outer surface of the shaft sleeve and the outer surface of one end of the shaft head, close to the shaft sleeve, form a winding forming surface of a transmission shaft body, the shaft sleeve is formed by annular splicing of a plurality of shaft sleeve units, the chord length corresponding to the outer circular arcs and the chord length corresponding to the inner circular arcs of each shaft sleeve unit are smaller than the inner diameter of the shaft head of the carbon fiber composite material transmission shaft based on the parting surfaces at two sides of the shaft sleeve, and the chord length corresponding to the outer circular arcs of at least one shaft sleeve unit is smaller than or equal to the chord length corresponding to the inner circular arcs.
8. The forming die of the carbon fiber composite transmission shaft is characterized in that key grooves are formed in the first connecting section of the mandrel, splines matched with the key grooves are formed in the inner walls of the two ends of the shaft sleeve unit, so that the shaft sleeve unit and the mandrel are clamped and relatively fixed, second slotted holes are formed in the outer wall of the second connecting section of the mandrel along the axial direction, the second slotted holes are matched with the first slotted holes in the inner wall of the mandrel, and pin holes are formed in the second connecting section of the mandrel and are used for installing pins to achieve the relatively fixing of the mandrel and the mandrel.
9. The mold for forming a composite carbon fiber drive shaft of claim 7, wherein a release structure is provided on an end surface of the second connecting section of the mandrel.
10. A method for forming a carbon fiber composite material transmission shaft, characterized by using the forming die of any one of claims 7 to 9, comprising the steps of: s1, connecting and assembling a forming die assembly, wherein the forming die assembly comprises a mandrel and a shaft sleeve, and then a shaft head is sleeved on a second connecting section of the mandrel, and the mandrel is fixed relative to the shaft sleeve, and the shaft head is fixed relative to the mandrel; S2, winding a blank of the transmission shaft body, namely winding a carbon fiber composite material layer on a winding molding surface of the transmission shaft body of the die assembly according to the pipe wall size of the carbon fiber transmission shaft body; s3, heating and curing, namely after the blank of the transmission shaft body is wound, transferring the whole transmission shaft body and the mould assembly into heating equipment for heating, curing and forming; s4, demolding, namely cooling after solidification and molding, and removing the mandrels at the two ends, wherein after the mandrels at the two ends are removed, the shaft sleeve unit can be taken out from the cavity of the carbon fiber shaft body one by one after the supporting function of the mandrels is lost, so that the carbon fiber composite material transmission shaft is obtained.

Description

Carbon fiber composite material transmission shaft, forming die and forming method thereof Technical Field The invention belongs to the field of carbon fiber composite materials, and particularly relates to a carbon fiber composite material transmission shaft and a preparation method thereof. Background Light weight is a great trend of development in the automobile field and the aerospace field, and is an important means for realizing energy conservation and emission reduction, for example, for automobiles, the light weight can reduce fuel oil or improve endurance mileage, and data show that if the weight of an airplane is reduced by 15%, the running distance of the airplane can be shortened by 15%, the voyage is increased by 20%, and the effective load is improved by 30%. In addition, the lightweight can also achieve the effects of improving the control performance, the comfort performance and the like. The carbon fiber composite material has the advantages of high specific strength, fatigue resistance, corrosion resistance and the like, so that the carbon fiber composite material is widely applied to structural designs of automobiles, aerospace and the like. The transmission shaft system is one of the heaviest key components in the mechanical equipment, and the bearing capacity and dynamic mechanical properties of the transmission shaft system directly influence the safety and stability of the whole mechanical equipment. In the current industry, besides the traditional transmission shaft prepared from metal materials, research and development of carbon fiber transmission shafts are also started. The carbon fiber transmission shaft researched and developed at the present stage is mainly prepared into a tubular or columnar transmission shaft body through wet winding, prepreg winding and pultrusion, and then the tubular or columnar transmission shaft body is connected with a metal end to prepare the carbon fiber transmission shaft, so that the transmission shaft body prepared by all the forming methods does not bypass the core of 'post connection', and the current post connection mode and defects thereof are as follows: (1) The method can generate the problem of interface stress concentration, namely, as the adhesive layer is an obvious mechanical property mutation area, the stress can be concentrated at the edge of the adhesive area when torque is transmitted, and the adhesive layer is easily cracked or the carbon fiber transmission shaft body is easily layered; (2) The method comprises the steps of pressing a metal shaft head into a carbon fiber transmission shaft body (a carbon fiber tube) in an interference fit mode, wherein on one hand, the method has extremely strict requirements on tolerance, the connection strength is insufficient due to the overlarge tolerance, and the metal shaft head is not pressed into the carbon fiber tube when the tolerance is too small; (3) The method cuts continuous fibers carrying core loads when the key groove or the spline is processed, so that serious stress concentration points are caused, and the structural integrity and the fatigue life are greatly sacrificed; (4) The method also can cut fiber continuity in the hole processing process and introduce a new stress concentration point. In addition to the defects, the connecting modes have the problems of long process flow and low production efficiency. Therefore, the structural design and the connection mode of the prior carbon fiber transmission shaft are not beneficial to exerting the mechanical property of the carbon fiber composite material. Disclosure of Invention In order to overcome the defects in the prior art, the invention aims to provide a carbon fiber composite material transmission shaft and a preparation method thereof, so as to solve the problem of connection reliability of the existing carbon fiber composite material transmission shaft, improve the overall mechanical property and the service life, and improve the production efficiency. In order to achieve the above purpose, the present invention adopts the following technical scheme: the carbon fiber composite material transmission shaft comprises a transmission shaft body and shaft heads arranged at two ends of the transmission shaft body, wherein the transmission shaft body is made of carbon fiber composite materials and is tubular, the shaft heads are made of metal or alloy and are tubular and inscribed in cavities at two ends of the transmission shaft body, the shaft heads and the transmission shaft body are reversely buckled and matched to be installed, and the shaft heads and the transmission shaft body are co-cured integrated parts. The transmission shaft body comprises a middle section and shaft head connecting sections at two ends, wherein the outer diameter and the inner diameter of the middle section are constant, the outer diameter and the inner diameter of the shaft head connecting sections are gradually reduced from one end close to the middle