JPH03223513A - Propeller shaft for vehicle - Google Patents

Abstract

PURPOSE:To improve jointing strength between a shaft main body and joint yokes by locally reinforcing a part in comparison with another part out of the shaft body where the joint yokes are press-fitted. CONSTITUTION:Joint yokes 3, 4 made of metal are press-fitted through rubber elastic bodies 5 to the inner circumferential parts on both ends of a shaft main body 2 made of FRP and formed into a tubular shape. As for the part of the shaft main body 2 where the joint yokes 3, 4 are press-fitted, at least one condition among winding angle theta1, winding density, the number of winding, and the diameter of element of reinforcing fiber 8 is locally set larger than another part. In this way, generation of residual stress on the press-fitted part side is restrained by resiliency of the rubber elastic body, and jointing strength between the shaft main body and the joint yoke can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a propeller shaft for a vehicle, and more particularly to a structure of a connecting portion between a shaft body made of FRP and metal joint yokes at both ends thereof.

Conventional technologyIn order to reduce the weight of propeller shafts for vehicles, the shaft body, which is the center of the propeller shaft, is made of GFRP and CFR.
The shaft body is made of FRP such as P, and a metal joint yoke is press-fitted into the inner periphery of both ends of the FRP shaft body via a rubber elastic body (for example, in 1983-
39825 and Utility Model Application No. 61-188016).

Problems to be Solved by the Invention As mentioned above, when a joint yoke is press-fitted into an FRP shaft body through a rubber elastic body, the durability of the rubber elastic body itself is ensured, and at the same time, the gap between the shaft body and the joint yoke is In order to ensure more reliable torque transmission, it is necessary to set a predetermined compression allowance in the radial direction of the rubber elastic body.

However, when the joint yoke is press-fitted into the shaft body while compressing the rubber elastic body in the radial direction, residual stress is generated in the FRP layer of the shaft body due to the repulsive force of the rubber elastic body, which causes the ends of the shaft body to FRP
Problems still remain in the practical application of manufactured propeller shafts.

The present invention was made in view of the above problems.
The purpose of this is to locally reinforce the end of the FRP shaft body into which the joint 3-k is press-fitted, thereby suppressing the generation of residual stress due to the repulsive force of the rubber-based elastic body. The object of the present invention is to provide a structure that improves the bonding strength between the joint yoke and the joint yoke.

Means for Solving the Problems The present invention involves press-fitting metal joint yokes into the inner periphery of both ends of an FRP shaft body formed into a tube shape using a filament winding method through a rubber elastic body. In the connected vehicle propeller shaft, at least one of the following conditions is satisfied for the part of the shaft body into which the joint yoke is press-fitted: the winding angle of the reinforcing fiber, the winding density, the number of windings, and the wire diameter. It is characterized by being set locally larger than other parts.

Moreover, as another form of the present invention, the wall thickness of a portion of the shaft body into which the joint yoke is press-fitted may be locally set to be thicker than other portions.

Effect: According to the above structure, both ends of the FRP shaft body into which the joint yoke is press-fitted are locally reinforced, thereby suppressing the generation of residual stress in the FRP layer due to the repulsive force of the rubber elastic body. In addition to improving the joint strength, the durability of the propeller shaft itself is also improved.

Embodiment FIGS. 1(A) and 1(B) are diagrams showing an embodiment of the present invention.
2 is a shaft body made of FRP that is the center of the propeller shaft 1, and 3 and 4 are metal joint yokes that are integrally connected by being press-fitted to the inner periphery of both ends of the shaft body 2 via a rubber elastic body 5. It is. The rubber elastic body 5 is vulcanized and bonded to the joint yokes 3 and 4 in advance.
As shown in FIG. 2(B), it is bonded to the shaft body 2 by using an adhesive at the time of press-fitting into the shaft body 2.

One joint yoke 3 is connected to an output shaft of a transmission on the engine side, and the other joint yoke 4 is connected to a differential device on the drive wheel side.

The tubular shaft main body 2 is formed by a filament winding method using reinforcing fibers such as glass fibers, carbon fibers, or aramid fibers and a matrix resin such as epoxy resin. Regarding the press-fitting part 7 into which the shaft parts 6 of the joint yokes 3 and 4 are press-fitted between both ends of the shaft body 2, reinforcing fibers 8 and 8
The winding angle θ1 at which they intersect with each other is set to be larger than the winding angle θ2 at other parts. In other words,
Regarding the press-fitting part 7, local reinforcement by the reinforcing fibers 8 itself is achieved by increasing the degree of orientation of the fibers in the circumferential direction rather than in the axial direction compared to the fiber orientation in other parts. Note that the length Ql of the press-fit portion 7 that is locally reinforced by the reinforcing fibers 8 is approximately equal to the length Q2 of the shaft portion 6 of the joint yokes 3 and 4.

According to the structure of this embodiment, even if the joint yokes 3 and 4 are press-fitted into the press-fit part 7 while compressing the rubber-based elastic body 5, the pressure-resistant strength of the press-fit part 7 is increased by local reinforcement. The generation of residual stress due to the repulsive force of the rubber elastic body 5 is suppressed. As a result, the strength and reliability of the connection between the shaft body 2 and the joint yoke 3.4 are increased, and the durability of the propeller shaft 1 is also improved.

In the embodiment shown in FIG. 2, the wrapping density of the reinforcing fibers 8 in the press-fitting part 7 is higher than in other parts in order to locally reinforce the press-fitting part 7. In this embodiment as well, the same effects as in the first embodiment can be obtained. Further, the same effect can be obtained even if the diameter of the reinforcing fibers in the press-fitting part 7 is larger than that in other parts.

In the embodiment shown in FIG. 3, the wall thickness t of the entire press-fitting part 7 is locally made thicker, for example, about twice that of other parts. Further, in the embodiment shown in FIG. 4, two flange-like ribs 9 are integrally formed as a means for locally thickening the press-fitting part 7. In the embodiments shown in FIGS. 3 and 4, in order to thicken the entire press-fitted part 7 or to form ribs 9, it is better to increase the number of turns of reinforcing fiber 8 only in that part. The wall thickness t may be increased or the ribs 9 may be formed. Also in the embodiments shown in FIGS. 3 and 4, the effect of locally reinforcing the press-fit portion 7 can be obtained.

In any of the above embodiments, any one of the winding angle, winding density, number of windings, and wire diameter of the reinforcing fiber 8 for the press-fitting part 7 is set more locally than for other parts. In addition to setting the area larger than other parts, multiple conditions may also be set to make the area larger than other parts.

Further, the embodiments shown in FIGS. 3 and 4 have the advantage that buckling of the shaft body 2 when the joint yokes 3, 4 are press-fitted into the shaft body 2 can be prevented. For example, when press-fitting the joint yokes 3 and 4 into the shaft body 2, conventionally, jigs 10 and 11 are used as shown in FIG.
After restraining the shaft body 2 with the joint yoke 3,
4 to the press-fitting part 7 of the shaft body 2 together with the rubber-based elastic body 5
However, due to the frictional force between the shaft body 2 and the rubber elastic body 5, an axial force of several tons is applied to the shaft body 2. Therefore, buckling of the shaft body 2 is likely to occur, and great care must be taken during press-fitting.

On the other hand, in the case of the embodiment shown in FIG. 3, for example, the stepped portion 12 is ensured by forming the press-fit portion 7 locally thick. Therefore, when press-fitting the joint yoke 3°4 into the shaft body 2 as shown in FIG.
The auxiliary jig 13 is applied to the stepped portion 12, and this jig 13
This makes it possible to bear the axial force associated with press-fitting.

As a result, buckling of the shaft body 2 can be prevented, improving workability and contributing to improving the quality of the propeller shaft 1.

Effects of the Invention As described above, according to the present invention, the press-fitted portions at both ends of the shaft body are locally reinforced compared to other parts, so even if the joint yoke is press-fitted together with a rubber-based elastic body, The generation of residual stress on the press-in part side due to the repulsive force of the rubber-based elastic body is suppressed, and the joint strength and reliability between the shaft body and the joint yoke are significantly improved, and the durability of the propeller shaft is also improved.

[Brief explanation of drawings]

FIG. 1(A) is a sectional view showing one embodiment of the present invention, FIG. 1(B) is an explanatory diagram of the propeller shaft shown in FIG. 1(A) during manufacture, and FIG. Explanatory diagram showing an example, 3rd
The figure is a cross-sectional view of a main part showing a third embodiment of the present invention, Fig. 4 is a perspective view of a main part showing a fourth embodiment of the present invention, and Fig. 5 is an explanation of the process of assembling a conventional propeller shaft. 6A and 6B are explanatory diagrams of the process of assembling the propeller shaft of the embodiment shown in FIG. 3. 1... Propeller shaft, 2... Shaft body, 3
゜4...Joint yoke, 5...Rubber elastic body,
7 Press-fitting part, 8... Reinforced fiber.

Claims (2)

[Claims] (1) On the inner periphery of both ends of the FRP shaft body formed into a tube shape using the filament winding method,
In a propeller shaft for a vehicle in which metal joint yokes are press-fitted and connected to each other via a rubber-based elastic body, the winding angle and winding of reinforcing fibers are determined in the portion of the shaft body where the joint yokes are press-fitted. 1. A propeller shaft for a vehicle, characterized in that at least one condition among the density of winding, the number of windings, and the wire diameter is set locally larger than in other parts. (2) In a propeller shaft for a vehicle, which is formed by press-fitting a metal joint yoke into the inner periphery of both ends of an FRP shaft body formed into a tube shape through a rubber-based elastic body and interconnecting the shaft. A propeller shaft for a vehicle, characterized in that a portion of the main body into which the joint yoke is press-fitted has a wall thickness that is locally set larger than other portions.