JP2001074060A - Sliding yoke and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce manufacturing cost, reduce weight, and improve abrasion resistant strength by respectively separably manufacturing a yoke shaft and a yoke of not penetrating a hole through a bifurcated base part, and integrally joining these both parts by pressure welding. SOLUTION: A yoke shaft 4 and a yoke 2 of not penetrating a hole through a bifurcated base part 17 are respectively separably manufactured, and these both parts are integrally joined in both pressure contact positions 16 by pressure welding. A recessed part 15 communicating with a through hole 13a is formed in a surface of the pressure welding positions 16 of the yoke 2, and the recessed part 15 is formed as a lubricating oil reservoir of grease etc. An inner peripheral spline 9 is formed by working the through-hole 13a of the sliding yoke shaft 4 by a broach. Thus, a technique for cutting a gear on a simple cylinder is easily automated to improve an inspection and productivity. The cylinder and the inner peripheral spline 9 can be formed by cold forging so that cost can be greatly reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding yoke of a universal joint used for a rotary power transmission shaft and a method of manufacturing the sliding yoke.

[0002]

2. Description of the Related Art A rotary power transmission shaft of a vehicle, a transport machine, etc.
When the transmission angle to the driven shaft is freely changed on the shaft, a universal shaft joint is used as a part of the shaft. For example, as shown in FIG. 5, when transmitting rotational power from the drive shaft 1 to the drive wheels 8,
The drive shaft 1 and the driven shaft 6 are connected by a cross-shaped universal joint 3 formed by a yoke 2 to absorb a vertical displacement 7. As means for absorbing the displacement amount 7, as shown in FIG. 6, an outer peripheral spline 5 is provided on the driven shaft 6, and is integrated with the yoke 2 having the connecting pin hole 10 at the forked end to the forked base of the yoke 2. An inner spline 9 is provided in a hole of the yoke shaft 4 formed by the penetrating cylinder 14 and is spline-fitted to the outer spline 5 of the driven shaft 6 so as to be slidable in the axial direction. So that it absorbs.

[0003]

The yoke shaft 4 can be machined with a blind hole by slotter processing for cutting the inner peripheral spline 9; however, the cost is high due to low productivity and the tooth accuracy at the bottom of the hole is guaranteed. It is costly and to ensure tooth escape,
Since the shape of the hole bottom is restricted, the broach drawing process is applied to the penetrating cylinder 14 penetrating to the bifurcated base of the yoke 2.

In general, the through cylinder 14 is formed by processing a forged product with a drill or the like, which wastes the cost of a drill tool and the cost of a material that is cut and removed by a drill into chips. In addition, there is a case where a process is added at the time of forging, and the material penetrates. However, although this reduces the cost of a drill tool and the cost of material used as chips, it is not significant because it is offset by the additional cost of the forging process.

The through tube 14 obtained by forging is inferior to the forged steel product in terms of fatigue strength and wear of spline teeth.
Numeral 4 indicates that the transmitted power at two points of the bifurcated yoke 2 is concentrated at the base of the yoke and is easily deformed because it is supported and passively supported. In order to prevent this, the yoke 2 is oversized or the thickness of the through cylinder 14 is reduced. Is oversized, which causes an increase in weight, and requires dimensional control to prevent vibration.

[0006] In spline wear countermeasures, high frequency quenching management becomes complicated due to the inner peripheral spline, and when hardening and tempering are set to high hardness, workability of the yoke and the like deteriorates. The cost is high and in many cases, high wear resistance measures are not usually taken.

Further, since it is difficult to continuously lubricate the sliding surface for smoothing the sliding function by the spline because of the rotating shaft, a grease reservoir 15 is formed in the through-in cylinder 14 as shown in FIG. Is regularly replenished with grease. In addition, since the through tube is used, it is necessary to close the grease reservoir 15 with the lid 12 in order to prevent the entry of dust and the like and the outflow of grease and the like from the outside to the sliding surface. There is a problem that the cost is increased due to operations such as press-fitting, caulking, screwing, and the like for mounting this.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sliding yoke with reduced manufacturing cost, reduced weight, improved wear resistance, and improved strength, and a method of manufacturing the same.

[0009]

According to a first aspect of the present invention, there is provided a sliding yoke according to the present invention, wherein the yoke is provided at the tip of a yoke shaft having an inner peripheral spline. The yoke shaft and the yoke having no through hole in the fork base are separately manufactured separately, and these two parts are joined and integrated by pressure welding.

According to a second aspect of the present invention, the yoke and the yoke shaft in the above construction are made of different materials suitable for the required strength, wear resistance and the like. is there.

According to a third aspect of the present invention, there is provided a manufacturing method of the present invention, wherein a yoke shaft having an inner peripheral spline formed in a penetrating cylinder and a yoke having no through hole formed in a forked base are provided. It is characterized by comprising a step of manufacturing separately and a step of joining and integrating these two parts by pressure welding.

According to a fourth aspect of the present invention, a step of separately manufacturing a yoke shaft having an inner peripheral spline formed in a blind hole and a yoke in which a hole is not penetrated in a bifurcated base portion is separately performed. And joining and integrating by pressure welding.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 3, the sliding yoke according to the present invention has a connecting pin hole 10 at the tip of the yoke shaft 4 on which the inner peripheral spline 9 is formed.
In the sliding yoke provided with the yoke 2, the yoke shaft 4 and the yoke 2 in which the hole is not penetrated in the fork base 17 are separately manufactured separately, and these two parts are joined by press contact at the press contact position 16 between them. It is an integrated structure.

The sliding yoke 20A shown in FIG.
The yoke shaft 4 is provided with a through hole 13a, and an inner peripheral spline 9 is formed on the inner periphery of the through hole 13a. Further, a recess 15 communicating with the through hole 13a is formed on the surface of the yoke 2 at the press contact position 16, and the recess 15 is used as a reservoir for lubricating oil such as grease.

The sliding yoke 20B shown in FIG.
The yoke shaft 4 is provided with a blind hole 13b, and an inner peripheral spline 9 is formed on the inner periphery of the blind hole 13b.
Further, the yoke 2 has a bifurcated base portion 17 in a peeled shape.
The bottom of the blind hole 13b is filled with lubricating oil such as grease.

The yoke 2 and the yoke shaft 4 of the sliding yoke 20A and the sliding yoke 20B may be made of the same material. However, it is preferable that the yoke 2 and the yoke shaft 4 be made of different materials suitable for the required strength, wear resistance and the like. .
For example, the yoke 2 requiring strength is suitably made of carbon steel, and the yoke shaft 4 requiring wear resistance is suitably made of alloy steel.

A method of manufacturing the sliding yoke 20A and the sliding yoke 20B will be described with reference to FIGS. The yoke 2 is manufactured by forging or casting separately from the yoke shaft 4. In this case, the yoke 2 of the sliding yoke 20A shown in FIG.

On the other hand, the yoke shaft 4 is made of a material such as a forged solid shaft, a forged or cast cylinder or a steel pipe, and the forged solid shaft is formed into a cylinder by drilling. In this case, the sliding yoke 20A has a through hole 13a, and the sliding yoke 20B has a blind hole 13b.

In forming the inner peripheral spline 9, the through hole 13a of the yoke shaft 4 of the sliding yoke 20A is formed.
Is processed by a broach or the like, and the blind hole 13b of the yoke shaft 4 of the sliding yoke 20B is processed by a slotter or the like. As a result, this method of cutting the teeth into a simple cylinder is easy to automate, and the inspection and productivity are improved. It is also possible to form the cylinder and the inner peripheral spline 9 by cold forging. As a result, simultaneous production of the cylinder and the teeth is enabled, and a significant cost reduction is achieved.

The press contact positions 16 of the yoke 2 and the yoke shaft 4 obtained as described above are brought into contact with each other and joined by press contact to form a hole in the connecting pin hole 10 and to remove burrs generated on the outer periphery of the press contact joint. By cutting and finishing, a finished product shown by the sliding yoke 20A and the sliding yoke 20B shown in FIGS. 1 and 3 is obtained.

[0021]

As described above, according to the present invention, a yoke shaft having an inner peripheral spline and a yoke are separately manufactured, and these two parts are pressed and joined to form a sliding yoke of an integrated product. This eliminates the need for a through hole for broach pulling out when processing the inner peripheral spline on the yoke shaft on the yoke side, and eliminates the need for a lid part for sealing the lubricating oil in the yoke shaft with the yoke itself. In addition, the manufacturing cost of the lid parts and press-fitting, caulking, screwing work, etc. for preventing the lid parts from falling off during rotation are greatly reduced. Further, since the yoke does not have a through hole, the strength of the yoke base at the yoke shaft is increased, and the power transmitted from the yoke to the yoke shaft can be dispersed within the yoke shaft. Since it is unnecessary, the weight can be reduced. In addition, since the yoke and the yoke shaft can be made of the same material, and can be made of different materials, an appropriate material can be arbitrarily selected according to the strength and wear resistance required of the yoke and the yoke shaft. As a result, the cost of the material can be reduced, and the yoke shaft can be quenched and tempered irrespective of the yoke. As a result, the yoke can be set to an easily workable hardness, and a low cost, long life and downsized sliding yoke can be provided.

[Brief description of the drawings]

FIG. 1 is a side view of a sliding yoke according to the present invention.

FIGS. 2A and 2B are side views showing parts of the sliding yoke of FIG. 1, wherein FIG. 2A is a yoke, and FIG.

FIG. 3 is a side view showing another embodiment of the sliding yoke of the present invention.

4A and 4B are side views showing parts of the sliding yoke of FIG. 3, wherein FIG. 4A is a yoke, and FIG.

FIG. 5 is a perspective view showing one embodiment of a portion where a sliding yoke is used;

FIG. 6 is a perspective view near a sliding spline.

FIG. 7 is a side view of a conventional sliding yoke.

[Explanation of symbols]

 2 Yoke 4 Yoke Shaft 9 Inner Peripheral Spline 10 Connecting Pin Hole 13a Through Hole 13b Bag Hole 15 Recess 16 Joining Site 17 Bifurcated Base 20A Sliding Yoke 20B Sliding Yoke

Continued on the front page (72) Inventor Ikuo Tamura 395-3 Motogenshamachi, Maebashi City, Gunma Prefecture Inside of RIKEN Forging Co., Ltd. (72) Inventor Takayuki Kawahara 395-3 Motogenshamachi Town, Maebashi City, Gunma Prefecture RIKEN Forging Co., Ltd. F-term (reference) 4E067 AA02 BB00 EB00

Claims (4)

[Claims] 1. A sliding yoke provided with a yoke at a tip end of a yoke shaft having an inner peripheral spline, wherein the yoke shaft and a yoke having no through hole formed in a forked base are separately manufactured. A sliding yoke characterized by being integrated by pressure welding. 2. The sliding yoke according to claim 1, wherein the yoke and the yoke shaft are made of different suitable materials according to required strength, wear resistance and the like. 3. A step of separately manufacturing a yoke shaft having an inner peripheral spline formed in a through cylinder and a yoke having no through hole in a forked base, and a step of joining and integrating these two parts by pressure welding. A method of manufacturing a sliding yoke, comprising: 4. A step of separately manufacturing a yoke shaft having an inner peripheral spline formed in a blind hole and a yoke not penetrating a bifurcated base, and a step of joining and integrating these two parts by pressure welding. A method of manufacturing a sliding yoke, comprising: