JPH05164214A - Gear transmission device - Google Patents

Abstract

PURPOSE:To provide a gear transmitting device which is capable of suppressing generation of abnormal noises and holding the gears. CONSTITUTION:A gear transmitting device is provided with a plurality of gears 4-6 which are respectively inserted in a plurality of shafts 2, 3 arranged in parallel. A protruded part 12 having a smooth curved surface 11 on the outer circumferential part is formed on the side surface of either of the gears 4, 6 which are inserted into the different shafts 2, 3 and whose side surfaces opposite to each other are brought close thereto. Even when the gears 4, 6 get inclined relative to the plane normal to the shaft center of the gears, the adjacent gears 4, 6 are brought into contact with each other by the smooth curved surface 11 on the outer circumferential part of the protruded part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear transmission.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a plurality of shafts 2 and 3 are erected on a frame 1, a gear 4 is rotatably fitted to one shaft 2, and meshed with the gear 4. Stepped gear 7 having gear 5 and gear 6 meshed with another gear (not shown)
Is rotatably fitted, and the rotation of the motor is transmitted to the target mechanical portion by the gear 4 and the stepped gear 7. Here, in order to prevent the gear 4 and the stepped gear 7 from moving in the thrust direction, for example, the stepped portion 8 formed on a part of the shafts 2 and 3 and the tip ends of the shafts 2 and 3 are fixed. Means such as holding the gear 4 or the stepped gear 7 with the retaining ring 9 is adopted. Further, as shown in FIG.
There is also one in which a flat protrusion 10 that abuts the side surface of the stepped gear 7 is formed on the side surface.

[0003]

In FIG. 3, the shaft 2,
The stepped portion 8 of 3 has a small diameter and supports only the central portion of the gear 4 or the stepped gear 7, and in order to smoothly rotate the gear 4 and the stepped gear 7, the distance from the stepped portion 8 to the retaining ring 9 is increased. The gear 4
Alternatively, it must be slightly thicker than the thickness of the stepped gear 7, which makes it easy for the gear 4 and the stepped gear 7 to fall down with respect to the plane orthogonal to the center lines of the shafts 2, 3. As a result, when the side surfaces of the gears 4 and 6 come close to each other, the side surface of the gear 4 comes into contact with the edge 6a of the tooth tip of the other gear 6 that is not in meshing relation. Therefore, there is a problem that abnormal noise is generated during rotation transmission and the gear 4 and the stepped gear 7 are worn. Figure 4
In the case of the gear 4 or the stepped gear 7 which is tilted with respect to the plane orthogonal to the center lines of the shafts 2 and 3, the side surface of the gear 4 is the edge of the outer peripheral edge of the projection 10 of the stepped gear 7. It abuts 10a, and the same problem occurs.

[0004]

SUMMARY OF THE INVENTION The present invention is a gear transmission having a plurality of gears fitted to a plurality of shafts arranged in parallel, the gears being fitted to different shafts and facing each other. A protrusion having a smooth curved surface is formed on the outer peripheral surface of at least one of the gears whose adjacent side surfaces are close to each other.

[0005]

Even if the gear falls on the plane orthogonal to the axis of the gear, the adjacent gears can be brought into contact with each other with the smooth curved surface of the outer periphery of the protrusion, thereby generating abnormal noise and gears. Can be suppressed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. The same parts as those described in FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted. On the side surface of the gear 6 near the side surface of the gear 4, a smooth curved surface 11 is formed on the outer peripheral portion.
The projecting portion 12 having is formed integrally.

In such a structure, even if the gear 4 or the stepped gear 7 is tilted with respect to the plane orthogonal to the axis thereof, the adjacent gears 4 and 6 are smoothly curved on the outer peripheral portion of the protrusion 12. It is possible to bring them into contact with each other, thereby suppressing generation of abnormal noise and wear of gears.

As shown in FIG. 2, the ring-shaped protrusion 14 having a semicircular cross-section is provided on the gear 6 so that smooth curved surfaces 11 and 13 are formed on the outer peripheral portion and the inner peripheral portion. It may be formed on the side surface. Although not shown, the same purpose can be achieved by arranging a plurality of hemispherical projections on the side surface of the gear 6 in an annular shape.

[0009]

According to the present invention, in a gear transmission having a plurality of gears respectively fitted to a plurality of shafts arranged in parallel, side surfaces fitted to different shafts and facing each other are close to each other. Since a protrusion having a smooth curved surface is formed on the outer peripheral portion on the side surface of at least one of the gears, even if the gear falls down with respect to a plane orthogonal to its axis, the adjacent gears Can be brought into contact with each other with a smooth curved surface on the outer peripheral portion of the protrusion, which has the effect of suppressing abnormal noise and wear of gears.

[Brief description of drawings]

FIG. 1 is a vertical side view showing an embodiment of the present invention.

FIG. 2 is a partial vertical side view showing a modified example.

FIG. 3 is a vertical sectional side view showing a conventional example.

FIG. 4 is a vertical sectional side view showing another conventional example.

[Explanation of symbols]

 2, 3 shafts 4 to 6 gears 11 curved surface 12 protrusions 14 protrusions

Claims (1)

[Claims] 1. A gear transmission having a plurality of gears fitted to a plurality of shafts arranged in parallel, wherein the gears fitted to the different shafts and having mutually facing side surfaces are close to each other. A gear transmission characterized in that at least one of the gears is formed with a protrusion having a smooth curved surface on the outer peripheral surface thereof.