JPH1089369A - Fixation structure for mechanical parts to shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform fixation in the axial direction with a simple means by forming a hole for housing a ball which has depth more than thickness of mechanical parts to be fixed, and press-fitting the ball to a position exceeding the thickness of the mechanical parts to be fixed so as to form an expansion part. SOLUTION: An outer peripheral surface 4 of a sleeve 2 has an outer diameter smaller than a diameter of a hole 5 of a plate to be fixed. A steel ball 6 having a diameter Dw larger than the inner diameter d1 of the sleeve 2 is press-fitted to the hole of the sleeve 2 from the right side where a radial flange 7 is located. The steel ball 6 widens the sleeve 2 until its outer peripheral surface 4 is in contact with the hole 5 to form an expansion part 9 projected outward in a radial direction within a range of a left surfce 8 of the plate. The plate is fixed between the flange 7 and the expansion part 9 with certainty in axially both directions. After press-fitting the steel ball 6, it can be left as it is. The expansion part 9 is not pressed back.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing structure for fixing a perforated mechanical part to a shaft or a sleeve by press-fitting a sphere having a larger diameter than the hole into the hole of the shaft or a sleeve.

[0002]

2. Description of the Related Art In order to fix a machined part to a shaft, a plurality of blind holes are provided at the shaft end, and a pushing element such as a ball is press-fitted into these blind holes with a preload. It is known to spread apart to connect the two parts inseparably (see GB 274954).

Another known example is that when connecting guide rods in a similar manner, two spheres of different diameters are arranged in series and the bottom of the blind hole of one of the parts to be fixed. The lower sphere present at is adjusted to the diameter of its blind hole,
The upper sphere, which rests on top of this lower sphere, is pressed into the axial bore of the other part with an inner diameter smaller than its diameter so as to widen the axial bore (DE 34).
25079).

[0004] In each of the known systems described above, blind holes are provided which extend over only a part of the thickness of the machine part to be fixed. Also, the expense associated with using two or more spheres. If a secure connection is also required in the axial direction, additional measures are required. Further, the above-mentioned known method cannot be applied to fixing a plurality of thin plate-shaped components side by side.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a mechanism for fixing a mechanical part to a shaft or the like of the type described at the outset, and to securely fix it in the axial direction by simple means.

[0006]

According to the invention, it is provided according to the invention that the holes for receiving the spheres are deeper than the thickness of the mechanical component (s) to be fixed and the spheres project radially. This is achieved by being pressed into the hole at a location beyond the thickness of the machine component (s) to be fixed to form the bulge. In particular, it is desirable that the blind hole be deeper than the thickness of the mechanical component or components to be fixed by at least the radius of the sphere.

According to the invention, the shaft is radially enlarged when the ball is pressed into the hole, so that a pressure fit is made with the machine part to be fixed. When the sphere is pressed beyond the thickness of the machine part, the shaft or sleeve is enlarged and the radius which serves to axially secure the machine part at the transition (from machine part to shaft or sleeve) A bulge protruding in the direction is formed. This method has an advantage that the fixing in the axial direction is performed without arranging a groove or the like.

When the shaft or the sleeve is provided with a projection or a flange on the side opposite to the bulge in the axial direction, the mechanical component to be fixed is fixed by an engagement connection between the bulge and the protrusion or the flange. , Are securely fixed in both axial directions.

The invention is also very well applied for arranging a plurality of thin plates or disks (discs) side by side on a cylindrical sleeve.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described in detail.

FIG. 1 shows a state in which a plate or disk 1 is to be fixed on a cylindrical sleeve 2 having a hole 3 having an inner diameter d1. The outer peripheral surface 4 of the sleeve 2 has an outer diameter D1 smaller than the diameter d2 of the hole 5 of the plate or disk 1 to be fixed. The plate or disk 1 has a thickness B.

In order to fix the two members 1 and 2, the diameter D larger than the inner diameter d1 of the sleeve 2 is inserted into the hole 3 of the sleeve 2.
The w steel ball 6 is press-fitted from the right side where the radial flange 7 is located. The steel ball 6 expands the diameter of the sleeve 2 until its outer peripheral surface 4 contacts the hole 5. The steel ball 6 is then pressed further in such a way that a radially outwardly projecting part 9 is formed in the area of the left side 8 of the plate or disk 1 (as shown in FIG. 2). The plate or disk 1 is fixed between the flange 7 and the protruding bulge 9, which ensures that the plate or disk 1 is fixed in both axial directions.

The steel ball 6 can be left in place after it has been pressed past the thickness B of the sleeve 2. This has a number of advantages, in particular that the bulge does not push back (when a small axial force acts on the part) or does not push completely through the sleeve 2.

[0014]

According to the present invention, mechanical parts can be easily and reliably fixed to a shaft or a sleeve.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a machine component before fixing.

FIG. 2 is a sectional view corresponding to FIG. 1 after press-fitting a steel ball.

[Description of Signs] 1 plate or disk (mechanical part) 2 sleeve 3 hole 6 steel ball 9 bulge

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Wolfgang Friedrich, Germany, 97424 Schweinfurt, Sudetenstrasse 26 (72) Inventor Roland Haas, Germany, 97461 Hofheim, Jakob Kliostrasse 9 (72) Inventor Roland Harrich, Germany, 97663 Hochheim, Dorfbrunnenstrasse 8 (72) Inventor Gerhard Hermann, Germany, 97422 Schweinfurt, Kerschensteinerstr. Linderauschoff 1

Claims (3)

[Claims] In a fixing structure for fixing a perforated mechanical part to a shaft or a sleeve by press-fitting a ball having a diameter larger than the hole into the hole of a shaft or a sleeve, a hole for accommodating a ball is fixed. Into the hole 3 at a position deeper than the thickness B of the mechanical part 1 to be fixed and beyond the thickness B of the mechanical part 1 to be fixed, so that the sphere 6 forms a radially projecting bulge 9. A structure for fixing mechanical parts to a shaft, which is press-fitted. 2. The structure for fixing a mechanical part to a shaft according to claim 1, wherein the hole 3 is deeper than the thickness B of the mechanical part 1 to be fixed by a size equal to or larger than the radius of the sphere 6. 3. The fixing of a mechanical part to a shaft according to claim 1, wherein the shaft or the sleeve has a radial projection or a flange on the side opposite to the bulging portion. Construction.