AT17616U1 - Composite drive shaft made of carbon fiber and its machining process - Google Patents

Abstract

The invention relates to a composite drive shaft comprising a carbon fiber tube (2) and shaft stubs (1, 3) which are arranged at the ends of the carbon fiber tube (2) and inside it and are firmly connected to the carbon fiber tube (2). The stub shafts (1, 3) are made of metallic material. A shaft coupling (4, 5, 6) is attached coaxially to the outer end of the second stub shaft (3). The shaft coupling (4, 5, 6) comprises a docking sleeve (6), a corrugated tube (5) and a connection ring (4). The connecting ring (4) is arranged coaxially outside the docking sleeve (6) and is firmly connected to the corrugated tube (5) and the second stub shaft (3). The connecting ring (4) and the docking sleeve (6) are arranged with a loose fit relative to one another. On the inside, the connection ring (4) has the shape of an arc curved in the direction of the docking sleeve (6) and is provided with a polytetrafluoroethylene ring (8), the inside of which rests against the docking sleeve (6), so that a relative movement between the connection ring (4) and the docking sleeve (6) and an angular offset between the carbon fiber tube (2) and the docking sleeve (6) are possible.

Description

description

COMPOUND DRIVE SHAFT COMPRISING A CARBON FIBER TUBE

TECHNICAL AREA

The present invention relates to a composite drive shaft comprising a carbon fiber tube and relates to the technical field of synchronous shafts.

TECHNICAL BACKGROUND

[0002] Electric motors are a type of device that convert electrical energy into mechanical energy and function as a core power component in automation devices. An electric motor usually transmits power to an actuator by means of a shaft coupling and a drive shaft, and movement of this actuator is thereby performed. Since ever increasing demands are placed on the power transmission accuracy by automation devices, the electric motor must be started and stopped as quickly as possible; however, an existing drive shaft is usually made of a metal having a high density, for this reason the drive shaft is heavy for the same volume, resulting in difficulty in starting and stopping the electric motor quickly, thereby affecting the working accuracy of automation devices.

OBJECT OF THE INVENTION

The present invention addresses the technical problem of overcoming the shortcomings of the prior art and providing a composite drive shaft comprising a carbon fiber tube, which realizes light weight and low inertia, can meet power transmission requirements, and quick starting and Allows stopping an electric motor.

To solve the technical problem, a composite drive shaft is proposed comprising a carbon fiber tube and a first stub shaft and a second stub shaft, which are symmetrically arranged at both ends of the carbon fiber tube. The first stub shaft and the second stub shaft have a substantially cylindrical shape and are arranged coaxially with the carbon fiber tube, the first stub shaft and the second stub shaft being respectively arranged in a corresponding end of the carbon fiber tube and fixed to the carbon fiber tube. The first stub shaft and the second stub shaft are made of a metallic material. A shaft coupling is coaxially fixed to the outer end of the first stub shaft or the second stub shaft.

Preferably, a plurality of outwardly directed first stub shaft projections are spaced from each other on the outside of the first stub shaft, and a plurality of outwardly directed second stub shaft projections are spaced from each other on the outer wall of the second stub shaft.

Preferably, the outer end of the first stub shaft is provided with a docking portion having a smaller diameter than the diameter of the inner end, the docking portion being arranged as a cylinder coaxial with the carbon fiber tube, and the outer end of the second stub shaft provided with a shaft coupling is.

The shaft coupling preferably comprises a docking sleeve and a corrugated tube, the docking sleeve and the second stub shaft being arranged coaxially with one another, the diameter of the end of the docking sleeve facing away from the second stub shaft being greater than the diameter of the end of the docking sleeve facing the second stub shaft, whereby a positioning flange is formed, and wherein the corrugated tube is disposed coaxially outside the docking sleeve between the second stub shaft and the positioning flange, and wherein the corrugated tube communicates with the second stub shaft and the docking sleeve.

Preferably, the shaft coupling further includes a connecting ring coaxially outside

the docking sleeve is arranged, wherein the connecting ring is arranged between the corrugated pipe and the second stub shaft and is firmly connected to the corrugated pipe and the second stub shaft, and the connecting ring and the docking sleeve are arranged in a clearance base to one another.

[0009]Preferably, the inside of the connecting ring has the shape of an arch that is curved in the direction of the docking sleeve.

Preferably, an installation groove is formed in the arcuate inside of the fitting ring, with a polytetrafluoroethylene ring being inserted into the installation groove and the inside of the polytetrafluoroethylene ring abutting the docking sleeve.

Preferably, the first stub shaft and the second stub shaft are each formed with an outer diameter gradually decreasing from the outer end to the inner end.

A locking sleeve is preferably provided inside the docking section and the docking sleeve.

Furthermore, a manufacturing method for a composite drive shaft as described above is disclosed, which comprises the following steps:

Step 1): Making a first stub shaft and a second stub shaft by turning and then welding first and second stub shaft projections to the outside of the first and second stub shaft.

Step 2): placing the first stub shaft and the second stub shaft at the ends of a reel shaft, applying an adhesive to the outside of the first stub shaft and the second stub shaft, and applying a mold release agent to the reel shaft between the first stub shaft and the second stub shaft .

Step 3): winding a carbon fiber laminate on the first stub shaft, on the second stub shaft and on the winding axis between the first stub shaft and the second stub shaft, and applying an adhesive between two respective adjacent layers of carbon fiber laminates, thereby forming a drive shaft.

Step 4): Disconnect the drive shaft from the reel axle after the adhesive has solidified.

BENEFICIAL EFFECTS

First, the both ends of the carbon fiber tube of this composite drive shaft are provided with a first stub shaft and a second stub shaft with a metallic material, thereby ensuring the connection strength between the output shaft of an electric motor and an actuator, with due to a small material density of the carbon fiber low weight and low inertia are realized with the same volume, conditions are created for rapid starting and stopping of the motor-driven drive shaft, and high working accuracy of automation devices with this drive shaft is ensured.

Second, a first stub shaft projection may be provided outside the first stub shaft and a second stub shaft projection may be provided outside the second stub shaft, thereby ensuring the fixation of the first stub shaft relative to the second stub shaft, and ensuring the power transmission accuracy of the entire drive shaft, thus avoiding that the power transmission accuracy is deteriorated due to rotation of the first stub shaft or the second stub shaft relative to the carbon fiber tube.

Thirdly, the first stub shaft can be connected to an actuator by means of the docking section, and the second stub shaft can be connected to the output shaft of an electric motor by means of the shaft coupling, thereby facilitating the installation of this drive shaft.

Fourth, a docking sleeve can communicate with the second stub shaft by means of the corrugated tube, the corrugated tube having a certain elasticity and therefore allowing the existence of a certain angle between the axis of the second stub shaft and the axis of the carbon fiber tube. This allows a certain amount of balance for the power transmission between the output shaft of an electric motor and this drive shaft and avoids that a non-coaxial arrangement of the output shaft of the electric motor relative to the drive shaft, caused by installation errors, impairs the power transmission and damages the drive shaft or the electric motor would.

Fifthly, a connecting ring can be provided between the corrugated tube and the second stub shaft, the connecting ring and the docking sleeve being arranged in a play with one another, so that the compensation angle between the docking sleeve and the carbon fiber tube is increased. The inside of the attachment ring may be in the form of an arc curved towards the docking sleeve so that a certain angle is included between the axis of the attachment ring and the axis of the docking sleeve, thereby avoiding damage due to a collision due to non-coaxial arrangement of the docking sleeve relative to the attachment ring becomes.

Sixth, a polytetrafluoroethylene ring can be provided on the inside of the terminal ring, by means of this measure, the abrasion resistance between the terminal ring and the docking sleeve is improved, and no damage would be caused due to non-coaxial arrangement of the terminal ring relative to the docking sleeve, and the terminal ring can be through keep the polytetrafluoroethylene ring in contact with the docking sleeve.

Seventh, the first stub shaft and the second stub shaft can each be formed with an outer diameter gradually decreasing from the outer end to the inner end, eliminating the stress concentration phenomenon, so that the strength of the first stub shaft and the second stub shaft is improved.

Eighth, the machining process for this composite propeller shaft requires simple technology, so this composite propeller shaft can be produced quickly and stably. The winding axis can ensure that the produced drive shaft achieves small errors and even mass distribution, which does not shake when rotating at high speed, and further increases the working accuracy of automation equipment.

DESCRIPTION OF THE DRAWINGS

Figure 1 shows a schematic representation of a composite drive shaft comprising a carbon fiber tube in a main sectional view.

Figure 2 is a partially enlarged view of part A in Figure 1. Figure 3 is a partially enlarged view of part B in Figure 1.

FIG. 4 shows a schematic illustration of a shaft coupling in a main sectional view.

Figure 5 is a partially enlarged view of part C in Figure 4.

Figure 6 is a schematic representation showing the interaction between a winding axis and a first stub shaft and a second stub shaft.

Figure 7 is a partially enlarged view of part D in Figure 6.

In the figures, reference numerals designate the following components: 1-first stub shaft; 101 docking section; 102-first stub shaft boss; 2-carbon fiber tube; 3-second stub shaft;

301-second stub shaft boss; 302-breakable groove; 4 connector ring; 401 installation groove; 5 corrugated pipe; 6 docking sleeve; 601- positioning flange;

7-locking sleeve; 8-polytetrafluoroethylene ring; 9-reel axis; and 901 roll-up section.

DETAILED DESCRIPTION OF EMBODIMENTS

Figures 1-7 show optimal embodiments of this invention, and the present invention is described in more detail below with reference to Figures 1-7.

The composite drive shaft comprises a carbon fiber tube 2, and a first stub shaft 1 and a second stub shaft 3 symmetrically arranged at both ends of the carbon fiber tube 2, the first stub shaft 1 and the second stub shaft 3 having a substantially cylindrical shape and are arranged coaxially with the carbon fiber tube 2; wherein the first stub shaft 1 and the second stub shaft 3 are each disposed in a respective end of the carbon fiber tube 2 and fixedly connected to the carbon fiber tube 2, the first stub shaft 1 and the second stub shaft 3 are made of a metallic material, and a shaft coupling is provided coaxially on the outer End of the first stub shaft 1 or the second stub shaft 3 is fixed.

The two ends of the carbon fiber tube 2 of this composite drive shaft are provided with a first stub shaft 1 and a second stub shaft 3 made of a metallic material, which ensures the connection strength between the output shaft of an electric motor and an actuator, whereby due to the low material density of carbon fiber, light weight and small inertia are realized with the same volume, conditions for quick starting and stopping of the motor-driven drive shaft are created, and high working accuracy of automation devices with this drive shaft is ensured.

The present invention is further described below with reference to specific embodiments; however, those skilled in the art will understand that the detailed description given with reference to the drawings is for better explanation, and the invention inevitably extends beyond these limited embodiments, therefore some equivalent substitutes or generic means fall within the scope, although no detailed description is made about them in this context becomes.

Specifically, as shown in Figures 1-3, the first stub shaft 1 is formed with an outer diameter gradually decreasing from left to right, whereby the stress concentration can be eliminated and the strength of the first stub shaft 1 is increased, while the right end of the first Shaft stub 1 is arcuate in order to avoid damage to the carbon fiber tube 2.

The second stub shaft 3 is also formed with an outer diameter gradually decreasing from right to left, whereby the stress concentration can be eliminated and the strength of the second stub shaft 3 is increased, while the left end of the second stub shaft 3 is circular arc-shaped to avoid damage of the carbon fiber tube 2 to avoid.

The first stub shaft 1 and the second stub shaft 3 are both made of a metallic material, preferably stainless steel, and both the first stub shaft 1 and the second stub shaft 3 are arranged coaxially to the carbon fiber tube 2, with the first stub shaft 1 in the left end of the carbon fiber tube 2 and is fixedly connected to the carbon fiber tube 2, while the second stub shaft 3 is also arranged in the carbon fiber tube 2, the right end of the second stub shaft 3 extends out of the carbon fiber tube 2, and the second stub shaft 3 with the carbon fiber tube 2 is firmly connected.

A plurality of outwardly directed first stub shaft projections 102 are arranged on the outer wall of the first stub shaft 1 at a distance from one another. The first stub shaft projections 102 are arranged along the radial direction of the first stub shaft 1 , the length of the first stub shaft projection 102 being smaller than the wall thickness of the carbon fiber tube 2 . The first stub shaft projection 102 protrudes from the inside of the carbon fiber

tube 2 into the tube wall of the carbon fiber tube 2, thereby ensuring a firm connection between the first stub shaft 1 and the carbon fiber tube 2 while maintaining synchronous rotation.

A plurality of outward second stub shaft projections 302 are spaced from each other on the outer wall of the second stub shaft 3, and the second stub shaft projections 301 are arranged along the radial direction of the second stub shaft 3, with the length of the second stub shaft projection 301 being smaller than the wall thickness of the carbon fiber tube 2 is The second stub shaft projection 301 protrudes from the inside of the carbon fiber tube 2 into the tube wall of the carbon fiber tube 2, thereby ensuring a firm connection between the second stub shaft 3 and the carbon fiber tube 2 while maintaining synchronous rotation.

The left end of the first stub shaft 1 is provided with a docking portion 101 having a smaller diameter than the right end of the stub shaft 1. The docking portion 101 is formed as a cylinder which is coaxial with the first stub shaft 1 is arranged. The docking section 101 is formed in one piece with the first stub shaft 1 .

The docking section 101 is used for docking with an actuator. A locking sleeve 7 is provided in the docking section 101 . In the present embodiment, the locking sleeve 7 is a hydraulic locking sleeve to ensure a coaxial connection with a drive component and precise power transmission. The left end of the first stub shaft 1 could also be connected to a shaft coupling.

The right end of the second stub shaft 3 extends out of the carbon fiber tube 2, and is connected to a shaft coupling, by means of which the second stub shaft 3 is connected to the output shaft of an electric motor, whereby not only the connection of the second stub shaft 3 with the output shaft of an electric motor, but also a balance between the drive shaft and the output shaft of the electric motor can be realized in order to avoid damage to the electric motor or the drive shaft due to the non-coaxial arrangement of the drive shaft relative to the output shaft of the electric motor.

As shown in Figures 4 and 5, the shaft coupling comprises a docking sleeve 6, a corrugated tube 5, and a connecting ring 4, the docking sleeve 6 being cylindrical and the outside diameter of the right end of the docking sleeve 6 being larger than that of the left end , whereby a positioning flange 601 at the right end of the docking sleeve 6 is formed. The corrugated tube 5 is arranged coaxially outside the docking sleeve 6, and the right end of the corrugated tube 5 is positioned on the positioning flange 601 with the corrugated tube 5 and the docking sleeve 6 being placed in a loose fit with each other.

The connection ring 4 is arranged coaxially outside of the docking sleeve 6 on the left end of the corrugated pipe 5 . The right end of the corrugated tube 5 is welded to the positioning flange 601, and the left end of the corrugated tube 5 is welded to the fitting ring 4, thereby realizing the assembly of the shaft coupling. The inner side of the connection ring 4 and the docking sleeve 6 are arranged in a clearance position relative to one another. Since the corrugated tube 5 has a certain elasticity, a balance for the output shaft of the electric motor and the drive shaft can be realized, which can allow the existence of a certain angle between the axis of the output shaft of the electric motor and the axis of the drive shaft, and influences caused by installation errors be eliminated.

The inner diameter of the left end of the docking sleeve 6 is larger than the inner diameter of the right end, thereby reducing the weight of the docking sleeve 6 and therefore reducing the inertia of the docking sleeve 6. The docking sleeve 6, the corrugated tube 5, and the connection ring 4 are all made of a metallic material, preferably stainless steel.

The inside of the fitting ring 4 is formed as an arc curved toward the docking sleeve 6, and an installation groove 401 is formed in the arc-shaped inside of the fitting ring 4, with a polytetrafluoroethylene ring 8 fitted into the installation groove 401.

is set and the inside of the polytetrafluoroethylene ring 8 rests against the docking sleeve 6. As a result, the coaxial arrangement of the connecting ring 4 relative to the docking sleeve 6 can be ensured, with the polytetrafluoroethylene ring 8 also improving the abrasion resistance between the connecting ring 4 and the docking sleeve 6, and also allowing relative movement between the connecting ring 4 and the docking sleeve 6.

The inner diameters of both ends of the corrugated tube 5 are each larger than the inner diameter in the middle of the corrugated tube 5, through a shoulder is formed at both ends of the corrugated tube 5, respectively. A terminal ring boss is integrally provided on the right side of the terminal ring 4, and the terminal ring boss protrudes into the left end of the corrugated tube 5 and is positioned at the shoulder of the left end of the corrugated tube 5 so that the terminal ring 4 and the corrugated tube 5 are positioned.

A positioning flange hump is integrally provided on the left side of the positioning flange 601, and the positioning flange hump protrudes into the right end of the corrugated tube and is positioned on the shoulder of the right end of the corrugated tube 5, while the positioning flange 601 is on the right side surface of the corrugated tube 5 abuts so that the positioning flange 601 and the corrugated tube 5 are positioned.

This facilitates the assembly of the shaft coupling, and in addition a relative displacement between the connecting ring 4 and the docking sleeve 6 is still ensured thanks to the elasticity of the corrugated tube 5. It is also ensured that the connecting ring 4 and the docking sleeve 6 of the shaft coupling can be reset after disassembly, and the service life of the shaft coupling is also increased.

The left side of the connection ring 4 is provided with a docking projection, the outer diameter of which is smaller than the inner diameter of the second stub shaft 3 . As a result, the docking projection protrudes into the right-hand end of the second stub shaft 3 during installation, and the second stub shaft 3 can be welded to the connecting ring 4 .

A locking sleeve 7 is built into the docking sleeve 6 coaxially. The locking sleeve 7 is preferably a hydraulic locking sleeve, as a result of which a coaxial connection of the output shaft of the electric motor to the docking sleeve 6 can be ensured.

As shown in Figures 6 and 7, a machining method for a composite carbon fiber drive shaft as described above is disclosed, comprising the following steps:

Step 1): Making a first stub shaft 1 and a second stub shaft 3 by turning and then welding a first stub shaft boss 102 and a second stub shaft boss 301 to the outside of the first stub shaft 1 and the second stub shaft 3.

A first stub shaft 1 is made by turning, and a first stub shaft boss 102 is welded to the outside of the first stub shaft 1 . A second stub shaft 3 is formed by turning, and a second stub shaft boss 301 is welded to the outside of the second stub shaft 3 . At the right end of the second stub shaft 3, a restriction flange with an inner diameter smaller than the inner diameter of the left end is formed by turning, while on the inside of the second stub shaft 3 on the left side of the restriction flange is a groove 302 with an inner diameter that is larger than the inner diameter of the left end is formed by turning.

Step 2): arranging the first stub shaft 1 and the second stub shaft 3 at the ends of a reeling axle 9, applying an adhesive to the outside of the first stub shaft 1 and the second stub shaft 3, and applying a mold release agent to the reeling axle 9 between the first stub shaft 1 and the second stub shaft 3.

The take-up shaft 9 is a rotating shaft arranged horizontally. An electric machine for rotating the winding shaft is connected to the winding shaft 9, and the diameter at the center of the winding shaft 9 is larger than the diameters of both ends, thereby providing a winding

section 901 is formed. The diameter of the winding section 901 is equal to or slightly smaller than the inner diameter of the right end of the first stub shaft 1 and the left end of the second stub shaft 3. The diameter at the end of the winding shaft 9 is equal to or slightly smaller than the inner diameter of the docking section 101.

The first stub shaft 1 is sheathed from the left end on the reeling axis 9, and the docking portion 101 of the first stub shaft 1 is located on the left side, while the inside of the right side of the first stub shaft 1 is on the end face of the left side of the reeling portion 901 is present. The second stub shaft 3 is sheathed from the right end of the winding shaft 9 on the winding shaft 9, and the limit flange of the second stub shaft 3 is located on the right side. The limiting flange of the second stub shaft 3 abuts the right side of the roll-up section 901, which ensures that the length of the manufactured drive shaft meets the requirements. A mold releasing agent is applied to the winding shaft 9 between the first stub shaft 1 and the second stub shaft 3 so that detachment of the coiled carbon fiber tube 2 is facilitated.

Step 3): winding a carbon fiber laminate on the first stub shaft 1, on the second stub shaft 3, and on the winding axis 9 between the first stub shaft 1 and the second stub shaft 3, and applying an adhesive between two respective adjacent layers of carbon fiber laminates, whereby a drive shaft is formed.

An adhesive is applied to the outer walls of the first stub shaft 1 and the second stub shaft 3, then a carbon fiber laminate is applied to the first stub shaft 1, to the second stub shaft 3, and to the winding axis 9 between the first stub shaft 1 and the second stub shaft 3 is wound up, and an adhesive is applied between two respective adjacent layers of carbon fiber laminates, thereby forming a drive shaft. The number of layers of wrapped carbon fiber is determined by the diameter of the drive shaft desired.

Step 4): Separating the drive shaft from the reeling axle 9 after the adhesive has solidified.

After the adhesive has solidified, the second stub shaft 3 is cut off at the groove 302 of the second stub shaft 3 . The limiting flange of the second stub shaft 3 is then removed, the drive shaft is moved to the left and separated from the winding axis 9, after which the machining of the drive shaft is completed.

The above statements relate only to preferred embodiments of the present invention and not to any limitations. Based on the technical content disclosed above, those skilled in the art could obtain equivalent embodiments after equivalent modifications through changes or modifications. Any simple changes, equivalent alterations and modifications to the above embodiments made from the technical teachings of this invention without departing from the gist of the technical solution of this invention still fall within the scope of the technical solution of this invention.

71717

Claims (9)

Expectations A composite drive shaft comprising a carbon fiber tube (2), and a first stub shaft (1) and a second stub shaft (3) symmetrically arranged at both ends of the carbon fiber tube (2), the first stub shaft (1) and the second The stub shaft (3) has a substantially cylindrical shape and is arranged coaxially with the carbon fiber tube (2), the first stub shaft (1) and the second stub shaft (3) each being arranged in a corresponding end of the carbon fiber tube (2) and connected to the carbon fiber tube (2) are fixedly connected, the first stub shaft (1) and the second stub shaft (3) being made of a metallic material, characterized in that a shaft coupling (4, 5, 6) is arranged coaxially on the outer end of the first stub shaft (1) or of the second stub shaft (3) is fixed. 2. The compound drive shaft of claim 1, characterized in that a plurality of outwardly directed first stub shaft projections (102) are spaced apart on the outside of the first stub shaft (1), and a plurality of outwardly directed second stub shaft projections (301) are spaced apart on the Outside of the second stub shaft (3) are arranged. 3. Composite drive shaft according to claim 1 or 2, characterized in that at the outer end of the first stub shaft (1) a docking section (101) is provided which has a smaller diameter than the inner end of the stub shaft (1), wherein the docking section (101) is arranged as a cylinder coaxial to the carbon fiber tube (2) and the outer end of the second stub shaft (3) is provided with a shaft coupling (4, 5, 6). 4. Composite drive shaft according to one of claims 1 to 3, characterized in that the shaft coupling (4, 5, 6) comprises a docking sleeve (6) and a corrugated tube (5), the docking sleeve (6) and the second stub shaft ( 3) are arranged coaxially to one another, the diameter of the end of the docking sleeve (6) facing away from the second stub shaft (3) being greater than the diameter of the end of the docking sleeve (6) facing the second stub shaft (3), as a result of which the second stub shaft ( 3) the opposite end of the docking sleeve (6) forms a positioning flange (601), the corrugated tube (5) being arranged coaxially outside the docking sleeve (6) between the second stub shaft (3) and the positioning flange (601) and the corrugated tube (5) connected to the second stub shaft (3) and the positioning flange (601). 5. Composite drive shaft according to claim 4, characterized in that the shaft coupling (4, 5, 6) further comprises a connecting ring (4) which is arranged coaxially outside the docking sleeve (6), the connecting ring (4) between the corrugated tube (5) and the second stub shaft (3) and is firmly connected to the corrugated tube (5) and the second stub shaft (3), and the connection ring (4) and the docking sleeve (6) are arranged in a clearance base to one another. 6. Composite drive shaft according to claim 5, characterized in that the connection ring (4) on the inside has the shape of an arc curved in the direction of the docking sleeve (6). 7. A compound drive shaft according to claim 6, characterized in that an installation groove (401) is formed in the arcuate inner side of the connecting ring (4), a polytetrafluoroethylene ring (8) is inserted into the installation groove (401) and the inner side of the polytetrafluoroethylene ring ( 8) rests against the docking sleeve (6). 8. Composite drive shaft according to one of claims 1 to 7, characterized in that the first stub shaft (1) and the second stub shaft (3) are each formed with an outer diameter gradually decreasing from the outer to the inner end. 9. Composite drive shaft according to one of claims 4 to 8, characterized in that in each case a locking sleeve (7) inside the docking section (101) and the docking sleeve (6) is provided. 8 sheets of drawings