JPS59159414A - Plastic drive shaft - Google Patents

Abstract

PURPOSE:To improve tortional strength and fatigue resistance by adhesively fixing the inner surface of a metal joint sleeve to the outer surface of the both ends of an FRP cylindrical pipe. CONSTITUTION:An FRP drive shaft consists of an FRP pipe 2 and a metal joint sleeve 3. The inner surface of the metal joint sleeve 3 is adhesively fixed to the outer surface of the both ends of the FRP pipe 2 through a layer of an adhesive 4. In this case, the end part outer surface of the FRP pipe 2 is brought in contact with pressure to the inner surface of the metal joint sleeve 3, with pressurized air, etc. being introduced in the hollow part of the FRP pipe 2, and utilizing, as necessary, a rubber bladder, etc. while the FRP pipe 2 and the adhesive 4 are heated and hardened by means of a heating oven, etc., thereby easily obtaining a drive shaft with strong adhesive force. And, thus, a drive shaft with improved tortional strength and fatigue resistance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lightweight drive transmission shaft made of fiber-reinforced synthetic resin that has excellent torsional strength and can accommodate a wide range of fiber winding angles.

In order to reduce the weight of vehicles, parts of vehicle drive shafts, etc. are made of lightweight fiber-reinforced synthetic resin (hereinafter referred to as FRP).
It is generally known that the structure is composed of a tube. This type of resin drive shaft is made by integrating a metal joint member that is connected to the drive shaft and driven shaft at one end or both ends of the FRP pipe, and when transmitting torque, the joint member and FRP
Conventionally, FR
This 1Φ (7-button 1-lus movement axis and 1,1) using P utilization is
For example, 1f [1] of both ends of the pipe is made of gold
Typically, the outer surface of a steel joint sleeve is bonded together with an adhesive such as Evoquin resin. An example of this is shown in Figure 1. In this figure, F
RP long drive shaft 1 FRP tube 2 (hollow body) and this Fi
It consists of a tubular metal joint sleeve 6 which is integrally joined to both ends of the main pipe 2 with their axes aligned with each other. In addition, FR
The inner surface of the end of the P-pipe 2 and the outer surface of the metal joint sleeve B are adhered to each other via a tin adhesive.

However, such conventional FRI) products,
Since the drive shaft 1 has the FRP pipe 2 and the metal joint sleeve 6 bonded to each other as in some parts, ++h. The diameter of the metal joint sleeve A at the part in contact with pH 2 becomes smaller, and the bonding area decreases, so the bonding length must be inevitably increased.Therefore, the weight of the metal joint sleeve 60 There are disadvantages that increase.

In addition, the drive shaft 1 made by li'RP maximizes the adhesive effect (/ζ The fiber is wound 7 onto the metal joint sleeve 3 using an adhesive using a forming method such as tape winding using resin-impregnated Noira, non-wintinic, or Blip sheet. However, due to the difference in coefficient of thermal expansion between the metal joint sleeve 3 and the FRP laminate, the FRP laminate layer suffers from thermal distortion (La 1 resin) during the resin curing process due to heating. (including curing shrinkage)
As a result, the torsional strength and fatigue resistance required for the drive shaft are significantly reduced, and there is a further drawback that these relationships vary greatly depending on the winding angle of the fibers. This means that - for example, continuous carbon fibers (
This is clear from the following discussion, shown in FIG. 2, of the cross-laminated (-70° winding) driving yoke 1 using Epoquine resin in addition to 7.7 trisox resin (CF).

Figure 2 shows the relationship between the winding angle (θ°) of CF and the net expansion coefficient (X 10-6/''C) of the resulting continuous carbon fiber reinforced synthetic resin (hereinafter referred to as CFRP) laminate. In the explanatory diagram, A in the diagram does not include steel.As can be seen from Figure 2, the cross-winding angle (/yaft length [axis reference)] of the CFRP bond layer is 3 t)'~ In the range of ±90°, the coefficient of thermal expansion in the radial force direction is smaller than that of the steel joint sleeve, so the heat between the CFRP bond layer and the sleeve is It will be subject to thermal distortion due to the difference in expansion coefficient, and as a result,
The CI"Rp laminate layer on the sleeve will have layered cracks in the circumferential direction, resulting in a significant decrease in torsional strength and fatigue strength. This tendency is The winding angle at which the thermal expansion coefficient (net expansion coefficient) of the layer is the minimum,
+ - 60"" with a remarkable 1, straddle, sleeve threaded structure (gold edge 1 joint sleeve flow 0 t, '(f
(414 construction to ground Ii to the inner surface 1 of FRPR2O3 part)
In this case, it is not suitable as a second drive shaft unless the winding angle is within a narrow range of 0'' to ±30°, and a winding angle of ±45° or a winding angle of ±45° to obtain the maximum torsional strength is recommended. For those with a winding angle that reduces the axial irregularity in the shaft length direction and exhibits the dumping effect by increasing the length, the sleeve thread cannot be practically achieved with L, 19 in terms of structure.

-,t,': In the example shown in Figure 2 of HL', a single cross laminate is described, but the coefficient of thermal expansion in the radial direction of the CFRP bond layer is higher than that of the metal fitting sleeve. If it is small, the above-mentioned drawbacks will occur regardless of the winding angle or laminated structure. Furthermore, (two words, CF
RI) Pre-shape the laminate, and after it hardens, attach the joint sleeve to the metal using a sealant. Jl,
After 1ilJ + adhesion, the structure due to adhesion and removal is also...! , )-6 is also the same.

Furthermore, one drive (lli
When used in the temperature range of 2 degrees Fahrenheit, the heat resistance is 111%, which is higher than that at room temperature. Since a valley will be formed, from this point of view, the thermal expansion coefficient is lower than that of the metal joint sleeve.
k * A laminated structure with all-in-one (1-in-1 cross-laminated structure with knee 30' to ±90°) is not practical. Double FBI on the inner and outer surfaces of the fitting sleeve
) There is an example of attaching the end of the tube (Japanese Patent Application Laid-Open No. 55-907)
No. 95), this has the disadvantage that the weight 1 of the joint C) increases considerably.

The present invention has been made to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a drive shaft made of resin that has improved torsional strength and fatigue resistance.

For this reason, the resin-made, driven latch of the present invention is FRP l'
+1 cylindrical pipe ■ cylindrical pipe 0 The inner surface of the metal mating sleeve is adhesively fixed to the outer end face of the cylinder pipe -1,1.

Hereinafter, embodiments of the present invention will be described based on FIG. In addition, in FIG. 3, the same location d as in FIG.

Figure 3 shows a resin 1WD vehicle according to the present invention! IfIIiill
This shows a one-law cross section of an example of b, and in the figure, l=” R
)'The production part moving shaft 1 is the same as in FIG.
There is a P shield 2 (hollow body) and a metal joint sleeve 6). J='■<sweat) Gold 7 (-f
The inner surface of the (hand three) 6 is adhesively fixed via a layer of adhesive 4.

To obtain this F Ri), drive 'I'llll 1,
For example, a laminate is formed by winding a continuous carbon edge 1r etc. with a continuous carbon edge 1r made of Ebogi/(Tachi 1 fat snow as a matrix) around a mandrel (1st 1 not shown).After that, the mandrel is When pulled out, a hollow laminate, namely F
R)) Obtain tube 2. First, apply adhesive 4 to the outer surfaces of both ends of the FRP pipe 2. Then, attach the metal joint sleeve 6 to the FRP i' so that its inner surface is in contact with the adhesive 4.
Attach and fix to both ends of q'2.

In this case, pressurized air, etc. is introduced into the hollow part of the FRI pipe 2, and if necessary, the FRP is
Strong adhesive strength is achieved by heating and curing the FRP pipe 2 and adhesive 4 in a heating oven or the like while pressing the outer surface of the end of the F 2 to the inner surface of the metal joint sleeve B. A drive shaft can be easily obtained. Alternatively, the FRP pipe 2 may be formed in advance by the Neiramen Y-Weinteink method, and after hardening, the metal joint sleeve 6 may be adhered to the outer end of the FRP pipe 2. Furthermore, if necessary, the outer surface of the end of the FRP pipe 2 and the inner surface of the metal joint sleeve may be tapered, and these may be fitted together and bonded with a bar.

As mentioned above, the resin drive+IQt+ of the present invention is constructed by bonding metal strips (the inner surface of the joint sleeve) to the outer surface of both ends of the RP cylindrical tube. It has the following features.

(1) Can accommodate a wide range of fiber wrapping angles. For example, a cross-layered structure using continuous carbon fibers (
(including both one-layer alternating 700-degree lamination and multiple layer-by-layer lamination), the winding angle is stable over a wide range of f30'' to +9 (1'). You can get it.

Note 1. Regarding the torsional strength required for the drive shaft, the upper limit of the winding angle is ±7 for single-cross winding.
The one at 5 degrees is good, but if it is 7 considering the damping property from the perspective of vibration damping, it is necessary to set the axis constant as low as possible, and from this point on, the lower limit The winding angle is preferably +45' or more. It may be merely the torsional strength or, if necessary, within the range of ±30' to -1-75°.

In addition, it is applicable not only to the droplet-wound configuration but also to a laminated configuration with different angles, and even when the coefficient of thermal expansion of the FRP cylindrical tube is lower than that of the metal tube.

(2) Since the metal joint sleeve is attached to the outer surface of the RP cylindrical pipe, the sleeve with threaded structure allows for easier installation and analysis.

For example, if the inner diameter (2r) of FRP eyebrow 2 is 50 mmφ, the thickness 1) is 4 mm and 15, and the joint length and shear torsional strength (τ) are constant, then Analyzing the maximum generated torque (7max) of each of the
)2-528] 1 space 1 digit type in τl ~ 'r'max
= 2 L T i r2-3925τ111 Naro1
, therefore, foreign news (V type is in 1′・jυ
-In fact, 35% more torque compared to the J type:
13 pieces that can generate C and L-, that is, the external attachment is of the type (・1, Ii'RP * 2 thickness is superior) Elj setting becomes ijJ function.

Furthermore, the structure of the metal joint sleeve 6 can also be designed to be lighter than that of the inner opening type due to the following =-t39-.

With the required load (T) and shear torsional strength (τ) constant as -, the thickness of each sleeve is r].
If the thickness of the FRP pipe is 4 mm, the thickness of the sleeve of the foreign type can be reduced by about 50 Sfj degrees. -This result also shows that the amount of EF can be reduced by about 30% compared to the internal type sleeve.As mentioned above, the advantages of the present invention are generally Even in the case of a single crossed 16-layer structure, it is possible to stably obtain a wide range of winding angles, and the weight and M of the drive shaft are also much lower! By: i (There is a great advantage, so the Hakusanjo of the request will be expanded. 1/According to the present invention, the thermal expansion coefficient is lower than that of the metal joint moss sleeve. I”R,P cylindrical tube with expansion coefficient (
By arranging metal joint sleeves on the outer surfaces of both ends (which may be hollow or solid), a strong tightening effect is achieved based on the difference in thermal expansion, which can significantly improve torsional strength and fatigue resistance. .

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view showing the main parts of an example of a conventional resin drive shaft, and Figure 2 is a graph showing the relationship between the winding angle of continuous carbon fibers and the coefficient of linear expansion of the resulting laminate. 3 are cross-sectional side views of essential parts of an example of a resin drive shaft according to the present invention. 1. FRP drive shaft...FRl) pipe, 3. Metal path - sleeve, 4. Adhesive, A... Steel. Agent: Patent Attorney Igo Ogawa − Patent Attorney: Masaru Noguchi Patent Attorney: Kazuhiko Yushita

Claims (1)

[Claims] 1. A drive shaft made of plastic, characterized in that the inner surface of a metal joint sleeve is adhesively fixed to the outer surface of both ends of a reinforced synthetic resin cylindrical tube.