JP3305481B2 - Connection structure between fiber reinforced resin cylindrical tube and metal end member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a fiber reinforced resin cylindrical tube and a metal terminal member, and more particularly to a fiber reinforced resin (hereinafter referred to as FRP) used for a propeller shaft of an automobile in recent years. The present invention relates to a connection structure suitable for connecting a hollow cylindrical tube with a connecting metal yoke concentrically connected to the end of the hollow cylindrical tube.

[0002]

2. Description of the Related Art In recent years, the FRP, which is a composite material, has been increasingly used for a drive system such as a propeller shaft in the course of reducing the weight of a vehicle even at the Japan Automobile Manufacturers Association. By the way, in such a propeller shaft or the like, there is a problem in transmitting torque in a rotating direction generated at a connection portion between a metal yoke constituting the propeller shaft and the FRP hollow tube when driving force is transmitted from the engine. Therefore, as proposals for dealing with such a problem, for example, those disclosed in Japanese Patent Application Laid-Open No. 3-37416 and those disclosed in Japanese Patent Application Laid-Open No. 56-131425 are known.

[0003] The invention disclosed in the former discloses that an axial spline groove is formed in an outer peripheral portion of a sleeve connected to an end of an FRP hollow cylindrical tube (FRP hollow tube), and a serration forming portion of the sleeve and the FRP are formed. A connection element made of a fiber reinforced resin material is interposed between the hollow tube end and the end of the hollow tube in order to tightly join the two. In addition, the invention disclosed in the latter is based on the idea that peripheral teeth of a connection element (members such as connection flanges) having peripheral teeth formed on the inner wall surface of the end of the FRP hollow tube are engaged or meshed. So that they fit together.

FIG. 4 shows an example of a basic connection structure between a metal yoke and an FRP hollow tube according to a conventional connection structure, and FIG. 4 (A) shows a basic structure of a joint. In FIG. 4A, reference numeral 1 denotes a metal yoke, and reference numeral 2 denotes an FRP hollow tube constituting a propeller shaft. In the case of the present example, the yoke portion 1A formed on the two forks of the metal yoke 1
1B is a stepped fitting portion of the yoke 1 and 1C is a serration (spline) formed on the outer peripheral surface of the fitting portion 1B in the axial direction. ), And the FRP hollow tube 2 is press-fitted into the fitting portion 1B in which the serrations 1C are formed as shown in FIG. FIG. 4C shows another tooth shape by serration.

[0005]

However, in the above-mentioned conventional examples, the fibers forming the FRP hollow tube main body are prevented from being damaged as much as possible.
FRP hollow tube with triangular or involute type tooth type formed at the top between spline grooves or serration grooves (1C) engraved on sleeve or yoke 2 etc. on the side to which P hollow tube 2 is connected Is not sufficiently engaged with the inner peripheral surface, and there is a possibility that the engagement is not maintained during torque transmission and the vehicle runs idle.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems by maintaining a sufficient coupling strength between an FRP cylindrical member and a metal terminal member coupled thereto, thereby obtaining a stable torque transmission. To provide a connection structure between the FRP cylindrical member and the metal terminal member.

[0007]

In order to achieve this object, the present invention provides a serrated tooth formed around an outer peripheral surface of a fitting portion of a metal terminal member on an inner peripheral surface of a fiber-reinforced resin cylindrical tube. in the connection structure of the embodiment to be pressed, along the inner peripheral surface
Each of the serrated tooth forms having a tooth surface of a predetermined width
Along the first tooth tip surface formed on the tip of the
A tooth surface having a predetermined width and a height difference with respect to the first tooth tip surface;
And a second tooth tip surface formed on the tooth tip in a row.
It is characterized in that that.

[0008]

According to the present invention, the inner periphery of a fiber reinforced resin cylindrical tube is provided.
Serrated tooth type with a tooth surface of a predetermined width along the surface
A first tip surface formed on each tooth tip and a portion along the inner peripheral surface;
It has a tooth surface with a fixed width and has a height difference with respect to the first tooth tip surface.
And a second tooth tip surface formed on the tooth tip.
For example, the outer diameter of the first addendum is larger than the outer diameter of the second addendum.
, The contact area of the tooth tip consisting only of the second tooth tip surface
Corresponds to the 1st tip surface and the part connected to the 1st tip surface
FRP cylindrical tube and metal end
Slip between the members is suppressed.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In the embodiment described below, the basic connection structure between the metal yoke 1 and the FRP hollow tube 2 is the same as that shown in FIG. Only the serrations engraved on the portion 1B are different. Therefore, only the serration according to the present invention will be described in detail below. FIG. 1 shows a serration according to a first embodiment of the present invention. Here, reference numeral 10 denotes a serration tooth form engraved on the fitting part 1B of the metal yoke 1. The serration tooth form 10 is provided around the fitting part 1B at a pitch shown as 11. ,
In FIG. 1A, such a serration tooth form 10 is shown in a form developed in the circumferential direction. FIG. 1B shows one serration tooth mold 10 taken out.

In FIG. 1, reference numeral 12 denotes a serration tooth 1
0 is a tooth tip surface, 13 is a bottom surface of a tooth space, 14 is a tooth surface of the serration tooth form 10, and the tooth surface 14 is a reference pressure angle α of 30 ° to 60 ° with respect to the radial direction in consideration of torque transmission. It is formed to keep. Also, here, the tooth height H of the tooth mold 10 which is the basis of the serration is the serration tooth form 10.
When the diameter up to the tooth tip surface 12 is D ₁ and the diameter up to the bottom surface 13 is D ₂ , it is naturally (D ₁ −D ₂ ) / 2.
Reference numeral 15 denotes an addendum surface formed by lowering the surface from the addendum surface 12 by one step (hereinafter, addendum surface 12 is referred to as a first addendum surface, and 15 is referred to as a second addendum surface). The tooth flanks formed on both sides to 12 and the second tooth flanks 15 are kept at the same pressure angle as the other tooth flanks 14.

In this embodiment, the second tooth tip surface 15 is the first tooth tip surface.
Although the width is set sufficiently wider than the tooth tip surface 12, the second
The tip surface 15 and the first tip surface 12 may be formed to have substantially the same width. In short, as shown in FIG. 1 (C), when the fitting portion 1B of the metal yoke 1 is pressed into the inner peripheral surface 2A of the FRP hollow tube 2, a tooth tip forming portion having the first tooth tip surface 12 is formed. 12A
Each width may be appropriately set as long as the fibers are formed so as to easily bite the inner peripheral surface 2A together with the tip forming portion 15A of the second tip surface 15 without breaking the fiber as much as possible. Also, a metal yoke 1 around which the serration tooth form 10 is provided.
The vicinity of the end of the FRP hollow tube 2 into which the fitting portion 1B is press-fitted is formed to be somewhat thicker as shown in FIG. The end of the serration tooth form 10 is chamfered to facilitate centering at the time of press-fitting.

In the connection structure between the FRP cylindrical tube and the metal yoke thus configured, as shown in FIG. 1C, the first tooth tip forming portion 12A and the second tooth tip forming portion 1 are formed.
At least three tooth surfaces formed by 5A (hereinafter referred to as torque transmitting surfaces in terms of functioning for torque transmission) 1
4, the inner peripheral surface 2A of the FRP hollow tube 2 and the serration tooth mold 10 of the metal yoke 1 are engaged with each other, so that an effect of suppressing torque transmission failure due to slippage that occurs easily in both directions can be obtained.

FIG. 2 shows a serrated tooth form according to another embodiment of the present invention. FIG. 2A shows the first tooth tip surface 12.
The second tip 15 and the third tip 1 on one side
FIG. 2B shows an example of a serration tooth form 20 in which the second tooth 6 is formed in a step shape.
An example of the serration tooth mold 30 in which the tooth tip surface 15 is formed is shown. By forming the tooth apical surface in multiple stages as described above, it is possible to more effectively prevent the slippage occurring in the serration tooth form by the multiple tooth surfaces 14 as the multi-stage torque transmitting surfaces.

FIG. 3 shows a serrated tooth form according to still another embodiment of the present invention. In this example, a plurality of tooth tops are formed in parallel at a portion corresponding to the top in one serration tooth. In FIG. 3A, two tooth tops 22 are formed on the top of the serration tooth 40. One bottom 23
Are formed. FIG. 3B shows an example of a serration tooth form 50 in which the tops and the torque transmission surfaces 14 on both sides of the two tooth tip forming portions 22A are continuous with a smooth curved surface, and FIG. ) Shows an example of a serration tooth mold 60 in which a tooth tip surface 24 is formed on one side outside of two tooth tip surfaces 22 and one bottom surface 23, and FIG. 3 (D) is FIG. 3 (C). As shown in the figure, an example of a serration tooth mold 70 in which two tooth top surfaces 22 and one bottom surface 23 are formed on the top, and the tooth top surfaces 24 are newly formed on both sides of the tooth top surface forming portion 22A, respectively. Show.

By forming the serrations as in this embodiment, the torque transmitting surface 14 can be more effectively configured and functioned. In the above-described embodiment, the number of the tooth tip forming portions formed on the top of the serration tooth mold is limited to one or two. However, the number of the tooth tip forming portions and the number of the tooth tip surfaces are as described above. It is needless to say that the present invention is not limited to this embodiment, and as long as there is room for formation at the top of the serration tooth form, more tooth tip forming portions, bottom surfaces, and tooth tip surfaces may be formed.

In the embodiment described above, the connection structure between the hollow propeller shaft made of FRP and the metal yoke has been described. However, the application of the present invention is not limited to this. And a metal terminal member can be widely applied to a connection structure in a form of connection via a serration tooth form.

[0018]

As described above, according to the present invention, a fiber having a predetermined width is formed along the inner peripheral surface of a fiber-reinforced resin cylindrical tube.
Formed on each tooth tip of serrated tooth with tooth surface
A first tooth tip surface and a tooth surface having a predetermined width along the inner peripheral surface;
One tooth tip surface is formed on the tooth tip continuously with a height difference
And the outer peripheral surface of the metal end member.
Inner circumference of FRP cylindrical pipe in peripheral serration
Effective biting method for transmitting torque to the surface
Can be. Therefore, for example, the outer diameter of the first
If it is larger than the outer diameter of the tip, if only the second tip
1st tooth tip surface and 1st tooth
Since the contact area corresponding to the part connected to the front surface increases, FR
Slip between the cylindrical tube made of P and the metal end member can be suppressed.
You.

[Brief description of the drawings]

FIG. 1 shows a tooth mold development view (A), a sectional view (B) of one tooth form and a sectional view (C) of a connected tooth form according to a first embodiment as a basic configuration of a serration tooth form according to the present invention. FIG.

FIGS. 2A and 2B are cross-sectional views showing two examples of a serration tooth form according to a second embodiment of the present invention; FIGS.

FIG. 3 is a cross-sectional view showing four examples of serration tooth forms according to a third embodiment of the present invention as (A), (B), (C) and (D).

FIG. 4 is a longitudinal sectional view (A) and a transverse sectional view (B) of a conventional connection structure to which the present invention can be applied, and a transverse sectional view (C) of an example of a conventional serrated tooth form. It is explanatory drawing shown respectively.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Metal yoke 1B Fitting part 2 FRP hollow cylindrical tube (FRP hollow tube) 2A Inner peripheral surface 10, 20, 30, 40, 50, 60, 70 Serration tooth type 11 Pitch 12, 15, 22, 24 teeth Tip surface 12A, 15A, 22A Tooth tip forming portion 13 Bottom surface 14 Tooth surface (torque transmitting surface)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 3/02 B29C 70/06 F16D 1/06

Claims (4)

(57) [Claims] 1. A connection structure according to press-fit the serrated tooth die was provided around the fitting portion outer peripheral surface of the metal terminal member to the inner peripheral surface of the fiber-reinforced resin-made cylindrical tube, given along the inner peripheral surface Having a tooth surface with a width of
A first tooth tip surface formed on each tooth tip of the first tooth type, and a first tooth tip having a tooth surface of a predetermined width along the inner peripheral surface.
Formed on the tooth tip in a row with a height difference to the surface
A connection structure between a fiber-reinforced resin cylindrical tube and a metal terminal member, comprising a second tooth tip surface . 2. The fiber reinforced resin according to claim 1, wherein a pressure angle of a tooth surface connected to the first and second tooth top surfaces is 30 ° to 60 °. Connection structure between cylindrical tube and metal terminal member. 3. A tooth space between the first and second tip surfaces.
Is formed.
Connection between the fiber-reinforced resin cylindrical tube and the metal terminal member described in
Connection structure. 4. The fiber reinforced resin cylindrical tube is a propeller shaft.
The metal end member constitutes a joint.
4. The member according to claim 1, wherein said member is a work member.
Fiber reinforced resin cylindrical tube and metal terminal according to any of the above
Connection structure with members.