JPH068336Y2 - Shaft with a bulb - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a shaft having a spherical portion which is preferably used for a change lever, a rearview mirror, etc. of an automobile.

(Prior Art) Conventionally, in a shaft having a ball portion of this type, a portion corresponding to the ball portion is formed by forging or the like with a machining allowance, and then the ball portion is machined into a predetermined shape by machining. There is a problem that the cost is high because the material loss is large and the number of processing steps is large.

In order to reduce the above-mentioned material loss and the number of processing steps, in JP-B-53-33309, a spherical portion having a connecting piece having a through hole fitted to the outer periphery of a shaft and a slightly thin cylindrical tongue piece. A manufacturing method has been proposed in which the through hole of the material is inserted into the shaft by inserting it, the connecting piece is joined to the shaft, and then the cylindrical tongue piece is spherically pressed to form a spherical portion on the shaft. There is.

However, in the above method, it is necessary to provide a tubular ball material with a through hole fitted to the outer periphery of the shaft and to previously provide a connecting piece to be joined to the shaft by welding or the like. In order to do so, forging or sheet metal processing is required, the number of man-hours for the ball material increases, and the cost increases, and a step of connecting the connecting piece of the ball material to the shaft by welding or the like is required, and The reduction has little effect.

Therefore, in Japanese Patent Publication No. 57-55925, a spherical shell formed by spherically pressing a tubular material is caulked and fixed to the outer circumference of a hollow base shaft, and a reinforcing member longer than the spherical shell is provided inside the basic shaft. A shaft having a spherical portion formed by reinforcing the crimping fixing portion and a method of manufacturing the shaft have been proposed, and the number of processing steps and the cost are reduced.

(Problems to be solved by the invention) By the way, when the base shaft is not a hollow material but a solid round bar, the stress of the base shaft is stronger than the compressive stress of the spherical shell formed by spherical forging. There is a problem that it is necessary to perform TIG welding or the like with the spherical shell as the base shaft in a later step because the spherical shell does not provide a reliable adhesion strength and the fixation is incomplete.

The present invention has been made to solve the above problems, and an object thereof is to provide a shaft having a spherical portion capable of securely attaching a spherical shell to a base shaft made of a solid round bar. To do.

(Means for Solving the Problems) For this reason, the present invention comprises a base shaft made of a solid round bar and a spherical shell having a through hole through which the base shaft penetrates.
A concave groove for prescribing the fixing position of the spherical shell is formed in advance on the outer periphery of the base shaft, and the spherical shell has a gap, and a tube material fitted onto the base shaft is hemispherical from both ends thereof. It is a pressed product which is fixed by crimping in a state where the pipe material is drawn by the press die and one end of the pipe material is embedded in the concave groove.

(Operation and effect of the present invention) The present invention is one in which a peripheral edge of a base made of a solid round bar is caulked and fixed in a groove formed in advance on one peripheral edge of a spherical shell. Therefore, compressive load 250
A sticking force that can withstand 0 kg or more can be obtained, there is no need to perform TIG welding or the like in a later step, and a groove formed in advance on the outer periphery of the base shaft makes it easy to position the fixed position of the spherical shell, The spherical shell can be accurately fixed at a predetermined position on the base axis.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a shaft having a spherical portion 1a, a base shaft 2 made of a solid round bar, and a spherical shell fixed to a proper position of the base shaft 2 to form the spherical portion 1a. 3 and 3.

The spherical shell 3 has a through hole 3 through which the base shaft 2 penetrates at its center.
a and 3b, and the peripheral edge of one through hole 3a is caulked and fixed in a recessed groove 2a formed on the outer periphery of the base shaft 2, and the peripheral edge of the other through hole 3b is aligned with the outer periphery of the base shaft 2. It is worn like this.

The concave groove 2a is not limited to the square groove shown in FIG.
It may be the V groove shown in FIG.

Next, a method of manufacturing the shaft 1 having the spherical portion 1a will be described with reference to FIGS.

First, as shown in FIG. 4, the cylindrical pipe member 7 is inserted into a predetermined position where the spherical portion 1a is provided in the base shaft 2 made of a solid round bar, and the outer periphery of the pipe member 7 is held by the holding means 6. Temporary clamping is performed so that the base shaft 2 and the pipe member 7 are concentric.

A lower press die 8 and an upper press die 9 that are divided into two parts are provided at upper and lower positions in the axial direction of the pipe member 7, the lower press die 8 is fixed, and the upper press die 9 is moved up and down.

Each of the press dies 8 and 9 has spherical cavities 8a and 9a on the opposing surfaces of the ends of the pipe material 7, and has axial base shaft insertion holes 8b and 9b at the center thereof. , 9b are slidably fitted on the base shaft 2.

The pipe material 7 is provided with a predetermined diameter and length corresponding to the size of the spherical portion 1a to be formed (size of the cavities 8a and 9a).
It is set to be slightly longer than the axial length along the inner surfaces of a and 9a.

Further, the pipe length and the pipe thickness are carefully selected in relation to the pipe diameter so that buckling does not occur when the pipe material 7 is formed. Further, in order to obtain a better roundness, it is preferable to set the dimension specifications to be optimum.

After arranging the press dies 8 and 9 on both sides of the end portion of the pipe member 7 as described above, the upper press die 9 is moved downward to approach the lower press die 8 as shown in FIG.

Since both ends of the pipe material 7 are held by the cavities 8a and 9a of the press dies 8 and 9 during the downward movement of the upper press die 9,
The clamp by the holding means 6 that temporarily clamps the pipe material 7 is released.

When the upper press die 9 is moved further closer downward, the tubular material 7 is axially centered along the cavities 8a, 9a with the maximum diameter being the through hole 3
Both ends of a and 3b are pressed into a spherical shape having a small diameter to form a spherical shell 3.

In the final process in which the inner end faces of both press dies 8 and 9 come into contact with each other,
Through holes 3a and 3b on both sides of the spherical shell 3 (openings at both ends of the pipe material 7)
Is squeezed, and the peripheral edge of one through hole 3a is caulked and fixed in a recessed groove 2a formed on the outer periphery of the base shaft 2, and the peripheral edge of the other through hole 3b is attached to the outer periphery of the base shaft 2. It is worn like this.

In this way, by caulking and fixing the peripheral edge of one of the through holes 3a of the spherical shell 3 in the concave groove 2a formed on the outer periphery of the base shaft 2 made of a solid round bar, Load 2
It has become possible to obtain a binding force that can withstand more than 500 kg,
It is not necessary to perform TIG welding or the like in the subsequent process.

The shaft 1 having the ball portion 1a is suitable for use as a change lever of a vehicle transmission or a support shaft for a rearview mirror, and the ball portion 1a is used to form a ball joint. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged cross-sectional view of an essential part of a shaft having a spherical portion according to the present invention, FIG. 2 is a sectional view of a shaft having a spherical portion, FIGS. 3 (a) and 3 (b) is a side view of the groove, and FIGS. 4 and 5 are cross-sectional views showing a manufacturing process of a shaft having a spherical portion. 1 ... Axis, 1a ... Sphere, 2 ... Base axis, 2a ... Recessed groove, 3
...... Spherical shell, 3a, 3b ...... Through hole, 7 ...... Tube material, 8, 9
...... Press type, 8a, 9a ・ ・ ・ Cavity.

Claims (1)

[Scope of utility model registration request] 1. A base shaft made of a solid round bar and a spherical shell having a through hole through which the base shaft penetrates. A fixed position of the spherical shell is previously defined on the outer periphery of the base shaft. The spherical shell body has a gap formed therein, and the tubular material having a gap and fitted onto the base shaft is drawn from both ends thereof by a hemispherical press die, and one end of the tubular material is inserted into the concave groove. A shaft having a spherical portion, which is a pressed product fixed by crimping in a bited state.