JPH01169109A - Manufacture of power transmission shaft - Google Patents

Abstract

PURPOSE:To improve joining tightness and reliability by joining an external power transmission member by means of external plastic joining over a serration section formed on the periphery of an inner power transmission member followed by press fit or shrinkage fit of a metallic ring over the joined external transmission member. CONSTITUTION:A pipe member 11 as an external power transmission member is joined by means of external plastic joining over a serration section 10c formed on the periphery of a shaft portion 10a of a yoke 10 as an internal power transmission member. Following this, a metallic ring member 12 is mounted over the periphery of an end portion 11a of a pipe member 11 by means of press fit or shrinkage fit. Such fitting works are performed by supporting the pipe member 11 on a jig, inserting the shaft portion 10a of the yoke 10 into the end portion 11a, and swaging the end portion 11a in the direction of reducing its diameter by means of a movable swaging die. As a result, the joined portion is made difficult to become loose, and the joined parts are prevented from falling off, improving reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a power transmission shaft formed by coupling at least two power transmission members.

(Prior art and its problems) Conventionally, in a propeller shaft for an automobile, as shown in FIG. (see Japanese Utility Model Application Publication No. 59-981274-'), or as shown in FIG. Fit the pipe member 3 onto the spline part (
those that are plastically bonded by pipe drawing), and
As shown in the figure, after the end 5a of the pipe member 5 is fitted onto the shaft 4a of the metal yoke 4, the outer periphery of the end 5a is tightened with a ring 6 (Utility Model No. 54-97541). (Refer to the same publication, G1-162619) etc., but when the load is high, the spline part, the serration part,
There is a problem that the joint part may shift due to insufficient strength of the tightening part.

On the other hand, as shown in FIGS. 9(a) and 9(b), the yoke 7, the pipe member 8, and the ring 9 are connected to each other by electromagnetic caulking '11.
It has been proposed that M is caulked at the same time.

However, this electromagnetic crimping (electromagnetic forming crimping [)]
Since the ring 9 is deformed by the repulsive horns of the magnetic force generated in the coil of the device M and the link 9, it is difficult to caulk unless the pitch of the grooves 7a of the yoke 7 is large. As a result, arrow a is shown in Figure 1O for the torsional torque.
A force as shown by acts on the pipe member 8 against the yoke 7.
easily loosens.

■Although it is preferable to use a material with a high specific elastic modulus for the ring 9 to reduce weight and increase bonding strength, there is a limit to the caulking ability of the device M, and a material with a high specific elastic modulus cannot be used. Furthermore, the ring 9 cannot be made of a thick material or a material that is difficult to conduct electricity.

Further, a force acting on the pipe member 8 that tends to open outward due to springback after electromagnetic caulking is suppressed by the ring 9, so that the tightening force of the ring 9 is reduced.

(2) Since the pipe member 8 is only shallowly wedged into the groove 7a of the yoke 7 due to the deformation of the ring 9, it is not sufficient to prevent the pipe member 8 from being pulled out.

(2) As mentioned in (2) above, since the tightening force of the ring 9 is weak, the joint may shift due to insufficient strength.

(Object of the Invention) The present invention has been made in view of the above-mentioned conventional problems, and its basic purpose is to improve the bonding force of the plastic joint between the inner power transmission member (yoke) and the outer power transmission member (pipe member). The purpose is to

(Structure of the Invention) For this reason, the present invention provides that after the inner peripheral part of the outer power transmitting member is fitted onto the serrations formed on the outer peripheral part of the inner power transmitting member and the outer power transmitting member is plastically connected, the inner peripheral part of the outer power transmitting member is The present invention is characterized in that a metal ring member is attached to the outer periphery of the power transmission member by press-fitting or shrink-fitting.

(Operations and Effects of the Invention) The present invention provides a method of connecting an inner power transmission member and an outer power transmission member through serrations, and then press-fitting or shrink-fitting a metal ring member to the outer periphery of the outer power transmission member at the plastic joint. It is designed to be worn.

Therefore, compared to the conventional electromagnetic caulking described above, ■The pitch of the serrations on the inner power transmission member (yoke) is small and it is possible to caulk at an acute angle, so the serrations are attached to the flesh of the outer power transmission member (pipe member). A biting force acts, making it difficult for the outer power transmission member to loosen relative to the inner power transmission member.

■Since the metal ring member is attached after the inner power transmission member and the outer power transmission member are plastically connected, there are no restrictions on the material and wall thickness of the ring member.

In addition, when caulking, the outer power transmitting member is sufficiently bitten into the serrations of the inner power transmitting member to form a plastic connection, and then the ring member is attached and the inner power transmitting member is connected to the inner power transmitting member by both the outer power transmitting member and the ring member. Since it is tightened, the tightening force of the ring member is not reduced.

(2) Since the outer power transmitting member is sufficiently wedged into the serrations of the inner power transmitting member, and the ring member is attached by press fit or shrink fit, the outer power transmitting member is sufficiently prevented from coming off.

■As mentioned in ■ above, since the tightening force of the ring member is large, the frictional resistance generated at the contact port between the inner power transmission member and the outer power transmission member increases, improving the bonding force between the two members. Highly effective in preventing slippage of plastic joints.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The yoke (inner (ljl+power transmission member) 10 and pipe member (outer power transmission member port 1) of the propeller shaft for an automobile shown in FIGS. 1 to 3 are made of aluminum alloy.

The material of the yoke IO and pipe member 11 is 6061
After manufacturing the yoke lO by forging and extruding the pipe member 11, the yoke lO is subjected to T6 treatment, and the pipe member 1 is
1 undergoes T4 treatment, which is a softer treatment layer.

On the outer circumference of the shaft member 10a of the yoke 10, axial serrations 10b are formed at a predetermined pitch over the entire circumference. Annular grooves 10c are formed in the serration portion 10b at a predetermined pitch in the axial direction.

Also, ring parts! 2 is also made of aluminum alloy, its material is A6061, and it is T4 treated. Note that the ring member 12 may be made of any material as long as it has a modulus of elasticity greater than or equal to an aluminum alloy. If iron-based material is used, a balance weight (not shown) can be spot welded to the ring member 12.

As shown in FIG. 4, the intermediate portion of the pipe member 11 is supported on jigs 14, 14 attached to the base board 13, and the shafts of the yokes to, to are attached to both ends 11a and Ila of the pipe member 11. Insert parts 10a and IQa, respectively,
Move the movable caulking die 15 in the direction of the arrow to tighten the end portion 11.
When a is squeezed in the direction of diameter reduction and caulked, the end portion 11
The inner peripheral part of a is plastically worked so as to fit into the serration part tab of the yoke IO, and the pipe member 11 is plastically coupled to the yoke 10 (see FIG. 3). In addition,
16 is a yoke pressing member that prevents the yoke 10 from moving in the axial direction.

Thereafter, as shown in FIG. 5, the movable die 17 holding the ring member 12 is moved in the direction of the arrow and attached to the outer circumference of the pipe member II at the plastic joint by press fit or shrink fit.

In addition, when installing the universal joint on the yoke lO, do you finish the hole 10d after caulking and installing the ring member 12? Do this.

As a result of a static torsion test of the propeller shaft in the water chamber and the conventional (Fig. 7) propeller shaft, it was found that displacement occurred in the plastic joint (caulked part) at a torsion torque of 200 kg/m in the conventional case. In the case of the water chamber, the pipe member 11 buckled at a torsion torque of 290 kg, m, and no damage occurred at the plastic joint (caulked part).

However, with the above method, compared to the conventional electromagnetic caulking described above, (1) the pitch of the serrations 10b of the yoke 10 can be made smaller and the serrations 10b can be caulked at an acute angle, as indicated by the arrows in FIG. As shown, the serration part 1ob is the pipe member 11
A force that bites into the flesh of the pipe member 11 acts, making it difficult for the pipe member 11 to loosen relative to the yoke IO.

■ Since the ring member 12 made of gold RIA is attached after the yoke lO and the pipe member 11 are plastically bonded, the ring member 1
There are no restrictions on the material or thickness of 2.

Furthermore, when caulking, the pipe member 11 is sufficiently bitten into the serrations 10b of the yoke 10 to form a plastic bond, and then the ring member 12 is attached and the yoke IO is tightened with both the pipe member 11 and the ring member 12. The clamping force of the ring member 12 is not reduced.

■ The pipe member 11 is the serration part 10 of the yoke IO
b and the annular groove 10c, and since the ring member 12 is attached by press fit or shrink fit, the removal of the pipe member 11 is sufficiently prevented.

■ As mentioned in (■) above, since the tightening force of the ring member 12 is large, the frictional resistance generated at the contact surface between the yoke lO and the pipe member 11 increases, and the bonding force between the two members 10 and 11 increases. This has a great effect in preventing slippage of the plastic joint.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a propeller shaft according to the present invention;
Figure 2 is a sectional view taken along the li line in Figure 1, Figure 3 is an enlarged view of section A in Figure 2, Figure 4 is a side view of the plastic coupling device for the yoke and pipe member, and Figure 5 is the attachment of the ring member. Side view of the device, No. 6
Figures 7, 8, 9(a) and 9(b) are side views of conventional propeller shafts, respectively, and Figure 1O is an enlarged cross-section taken along the line ■-■ in Figure 9(b). It is a diagram. IO... Yoke (inner power transmission member), 10a...
Shaft part, tab... Serration part, 11... Pipe member (outer power transmission member), 11a.
...End, 12...Ring member. Patent originator: Showa Aluminum Co., Ltd. (1 idiot) Agent: Patent attorney: Aoyama Aoyama and 2 other people Figure 1 Figure 2■ Figure 3 Figure 6 Figure 8 Two people

Claims (1)

[Claims] (1) After the inner circumferential portion of the outer power transmitting member is fitted onto the serrations formed on the outer circumferential portion of the inner power transmitting member and the outer circumferential portion of the outer power transmitting member is plastically connected, a metal A method for manufacturing a power transmission shaft, characterized in that a manufactured ring member is attached by press-fitting or shrink-fitting.