JP2002266985A - Gear - Google Patents

Abstract

(57) [Problem] To provide a gear capable of reducing noise. SOLUTION: It has a rubber damper 8 fixed to a rotating shaft, and an outer diameter portion 6 on which teeth 4 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gear for transmitting a driving force from a driving source such as a motor.

[0002]

2. Description of the Related Art In general, office equipment such as an image forming apparatus such as a copying machine, a printer, and a facsimile uses a gear to transmit a driving force from a driving source such as a motor.

[0003]

However, when vibration of a motor or the like is transmitted to the housing of the office equipment via a gear, there is a problem that the housing vibrates and generates noise.

Therefore, an object of the present invention is to provide a gear capable of reducing noise.

[0005]

According to a first aspect of the present invention, there is provided an inner diameter portion fixed to a rotating shaft and an outer diameter portion formed with teeth, and the inner diameter portion is made of a rubber material. It is characterized by the following.

According to the first aspect of the present invention, since the inner diameter portion fixed to the rotating shaft is made of a rubber material, the inner diameter portion buffers shock from a driving source, thereby suppressing noise and vibration. Can be.

According to a second aspect of the present invention, in the first aspect of the invention, irregularities are provided on the outer peripheral side of the inner diameter portion and the inner peripheral side of the outer diameter portion so as to fit in the rotational direction. It is characterized by the following.

[0008] According to the second aspect of the invention, the first aspect is provided.
In addition to the same operation and effect as the invention described in the above, the outer peripheral side of the inner diameter part and the inner peripheral side of the outer diameter part are provided with projections and depressions that fit together in the rotating direction, so that the inner diameter part and the outer diameter part Can be prevented from shifting in the rotation direction of the gear, and idle rotation of the gear can be prevented.

The invention described in claim 3 is the first or second invention.
In the invention described in (1), irregularities are provided on the outer peripheral side of the inner diameter portion and the inner peripheral side of the outer diameter portion so as to fit each other in the axial direction.

[0010] According to the third aspect of the invention, the first aspect is provided.
Or the same effect as the invention described in 2 above, and the outer peripheral side of the inner diameter part and the inner peripheral side of the outer diameter part are provided with projections and depressions that are fitted to each other in the axial direction. It is possible to prevent the outer diameter portion from shifting in the axial direction.

According to a fourth aspect of the present invention, there is provided an inner diameter portion rotatably provided on a rotating shaft, and an outer shape portion having teeth formed thereon, and a rubber material is provided between the inner diameter portion and the outer diameter portion. It is characterized by having.

According to the fourth aspect of the present invention, since the rubber material is interposed between the inner diameter portion and the outer diameter portion, the rubber material buffers the impact from the driving source, so that the noise is reduced. be able to. Further, since the inner diameter portion is rotatably provided on the rotating shaft, it can be used also as an idler gear.

According to a fifth aspect of the present invention, in the fourth aspect, the outer peripheral side of the inner diameter portion and the inner peripheral side of the rubber material, and the outer peripheral side of the rubber material and the inner peripheral side of the outer diameter portion are provided. Are characterized in that they are provided with concavities and convexities that fit each other in the rotation direction.

According to the fifth aspect of the present invention, there is provided the fourth aspect.
In addition to the same operation and effect as the invention described in the above, the outer peripheral side of the inner diameter portion and the inner peripheral side of the rubber material, and the outer peripheral side of the rubber material and the inner peripheral side of the outer diameter portion are respectively fitted in the rotational direction. By providing the concavo-convex portions, it is possible to prevent the mounting portion, the rubber material, and the outer diameter portion from shifting in the rotation direction of the gear, and prevent the gear from idling.

The invention according to claim 6 is the invention according to claim 4 or 5.
In the invention described in the above, the outer peripheral side of the inner diameter portion and the inner peripheral side of the rubber material, and the outer peripheral side of the rubber material and the inner peripheral side of the outer diameter portion, respectively, are provided with irregularities that fit in the axial direction. It is characterized by being.

According to the invention described in claim 6, in claim 4
Or the same effect as that of the invention described in 5 is obtained, and the outer peripheral side of the inner diameter portion and the inner peripheral side of the rubber material, and the outer peripheral side of the rubber material and the inner peripheral side of the outer diameter portion are respectively formed in the axial direction. The provision of the concave and convex portions that fit each other can prevent the inner diameter portion, the rubber material, and the outer diameter portion from shifting in the axial direction.

[0017]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows the first
It is a figure which shows the gear which concerns on embodiment, (a) is a front view which shows the gear fixed to the rotating shaft, (b) is sectional drawing of the gear fixed to the rotating shaft.

The gear 1 is used in an image forming apparatus such as a copying machine, a printer, and a facsimile, and transmits a rotational driving force from a driving source such as a motor. Gear 1 is shown in FIG.
As shown in FIGS. 3A and 3B, the rotary shaft 3 is composed of a rubber damper (rubber material) 8 having an inner diameter portion fixed to the rotating shaft 3 and an outer diameter portion 6 on which the teeth 4 are formed.

The D-cut portion 5 of the rotary shaft 3 is inserted into the insertion hole 2 of the rubber damper 8, and the gear 1 abuts and stops on an E-ring 7 for preventing the gear 1 from coming off in the axial direction. In the present embodiment, the rubber damper 8 is made of hard rubber, but is not limited to this.

On the outer peripheral side of the rubber damper 8, an outer diameter portion 6
Are formed, and the teeth 4 of the outer diameter portion 6 mesh with another gear to transmit a rotational driving force from a driving source such as a motor. In the present embodiment, the outer diameter portion 6 is formed by molding a polyacetal resin, but the outer diameter portion 6 is not limited to this, and may be made of, for example, a metal.

By providing the rubber damper 9 inside the outer diameter portion 6 as described above, the rubber damper 8 buffers shock from a driving source, so that noise and vibration can be suppressed.

Next, another embodiment will be described. In the description, the same parts as those described above are denoted by the same reference numerals, and the description thereof will be omitted.

FIGS. 2A and 2B are views showing a gear according to a second embodiment, wherein FIG. 2A is a front view showing a gear fixed to a rotating shaft, and FIG. 2B is a front view showing a gear fixed to the rotating shaft. FIG.

In the second embodiment, FIGS. 2A and 2B
As shown in FIG. 2, a damper-side convex portion 8a is formed on the outer peripheral side of the rubber damper 8, and an outer-diameter concave portion 8a is formed on the inner peripheral side of the outer diameter portion 6.
The first embodiment differs from the first embodiment in that the damper-side protrusion 8a and the outer-diameter side recess 8a are fitted. As described above, since the outer peripheral side of the rubber damper 8 and the inner peripheral side of the outer diameter portion 6 are fitted by the outer diameter side concave portion 8a and the damper side convex portion 8a, the rubber damper 8 and the outer diameter portion 6 are geared. 1 can be prevented from shifting in the rotation direction, and idle rotation of the gear 1 can be prevented.

FIGS. 3A and 3B are views showing a gear according to a third embodiment, in which FIG. 3A is a front view showing a gear inserted through a rotary shaft, and FIG. 3B is a front view showing a gear inserted through a rotary shaft. FIG. In the third embodiment, as shown in FIGS. 3A and 3B, the inner diameter portion 9 rotatably provided on the rotating shaft 3.
And an outer diameter portion 6 on which the teeth 4 are formed, and a rubber damper (rubber material) 11 provided between the inner diameter portion 9 and the outer diameter portion 6.

An inner diameter side convex portion 9 a is formed on the outer peripheral side of the inner diameter portion 9, and a damper side concave portion 11 is formed on the inner peripheral side of the rubber damper 11.
are formed, and the inner diameter side convex portion 9a and the damper side concave portion 11a are fitted. Further, on the outer peripheral side of the rubber damper 11, an outer diameter side concave portion 8a formed on the inner peripheral side of the outer diameter portion 6 is formed.
Is formed with a damper-side convex portion 11a.

In the present embodiment, the noise and vibration can be suppressed by the rubber damper 11 and the inner diameter portion 9 is rotatably provided on the rotary shaft 3 so that
The gear 1 can be used as a so-called idler gear. Further, the rubber damper 11 and the inner diameter portion 9 are fitted by the inner diameter side convex portion 9a and the damper side concave portion 11a, and the rubber damper 11 and the outer diameter portion 6 are fitted by the damper side convex portion 11a and the outer diameter side concave portion 8a. Accordingly, it is possible to prevent the inner diameter portion 9, the rubber damper 11, and the outer diameter portion 6 from shifting in the rotation direction of the gear 1, and to prevent the gear 1 from idling.

FIGS. 4A and 4B are views showing a gear according to a fourth embodiment, in which FIG. 4A is a front view showing a gear inserted through a rotating shaft, and FIG. 4B is a front view showing a gear inserted through a rotating shaft. FIG. In the fourth embodiment, as shown in FIGS. 4A and 4B, an inner diameter side projection 9b is provided at a substantially central portion in the width direction (axial direction) on the outer peripheral surface of the inner diameter portion 9. A substantially central portion in the width direction on the inner peripheral surface of the rubber damper 11 is provided with a damper-side concave portion 11c, and the inner-diameter-side protrusion 9b and the damper-side concave portion 11c are fitted.

A damper-side projection 11d is provided at a substantially central portion in the width direction on the outer peripheral surface of the rubber damper 11, and is provided at a substantially central portion in the width direction on the inner peripheral surface of the outer diameter portion 6. Is provided with an outer diameter side depression 6b, and these damper side protrusions 11d and the outer diameter side depression 6b are fitted.

As described above, the inner diameter side projection 9b into which the damper side recessed part 11c of the rubber damper 11 is fitted is provided substantially at the center of the outer circumference of the inner diameter part 9b. By providing the damper-side protrusion 11d of the rubber damper 11 at the center, it is possible to prevent the inner diameter portion 9, the rubber damper 11, and the outer diameter portion 6 from shifting in the axial direction.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the first embodiment, the rubber damper 8 is provided with a damper-side convex portion 8a, and the outer diameter portion 6 is provided with the convex portion 8a.
Although the outer diameter side concave portion 6a to be fitted to a is provided, the rubber damper may be provided with a concave portion and the outer diameter portion 6 may be provided with a convex portion to be fitted to the concave portion of the rubber damper.

In the first embodiment as well, the projections and depressions as in the fourth embodiment are so formed that the outer peripheral surface of the rubber damper 8 and the inner peripheral surface 6 of the outer diameter member do not shift in the axial direction. You may do it.

[0033]

According to the first aspect of the present invention, since the inner diameter portion fixed to the rotary shaft is made of a rubber material, the inner diameter portion buffers shock from a driving source, thereby suppressing noise and vibration. be able to.

According to the second aspect of the present invention, the same effect as that of the first aspect of the invention is obtained, and the outer peripheral side of the inner diameter part and the inner peripheral side of the outer diameter part are fitted to each other in the rotational direction. Since the unevenness is provided, it is possible to prevent the inner diameter portion and the outer diameter portion from shifting in the rotation direction of the gear, and prevent the gear from idling.

According to the third aspect of the present invention, the same effect as that of the first or second aspect is obtained, and the outer peripheral side of the inner diameter portion and the inner peripheral side of the outer diameter portion are fitted to each other in the axial direction. By providing the concavo-convex portions, it is possible to prevent the inner diameter portion and the outer diameter portion from shifting in the axial direction.

According to the fourth aspect of the present invention, since the rubber material is interposed between the inner diameter portion and the outer diameter portion, the rubber material buffers an impact from a driving source, so that noise is reduced. Can be. Further, since the inner diameter portion is rotatably provided on the rotating shaft, it can be used also as an idler gear.

According to the fifth aspect of the present invention, the same effects as those of the fourth aspect of the invention can be obtained, and the outer peripheral side of the inner diameter portion and the inner peripheral side of the rubber material, the outer peripheral side of the rubber material and the outer diameter portion can be obtained. The inner peripheral side of the gear is provided with unevenness that fits each other in the rotation direction, so that the mounting portion, the rubber material, and the outer diameter portion can be prevented from shifting in the rotation direction of the gear, and the idle rotation of the gear can be prevented. Can be prevented.

According to the sixth aspect of the present invention, the same effects as those of the fourth or fifth aspect can be obtained, and the outer peripheral side of the inner diameter portion and the inner peripheral side of the rubber material, and the outer peripheral side of the rubber material and the outer peripheral side thereof. By providing irregularities that fit each other in the axial direction on the inner peripheral side of the radial portion, it is possible to prevent the inner diameter portion, the rubber material, and the outer diameter portion from shifting in the axial direction.

[Brief description of the drawings]

FIG. 1 is a view showing a gear according to a first embodiment,
(A) is a front view which shows the gear fixed to the rotating shaft,
(B) is a sectional view of the gear fixed to the rotating shaft.

FIG. 2 is a view showing a gear according to a second embodiment;
(A) is a front view which shows the gear fixed to the rotating shaft,
(B) is a sectional view showing a gear fixed to a rotating shaft.

FIG. 3 is a view showing a gear according to a third embodiment;
(A) is a front view showing the gear inserted through the rotating shaft,
(B) is a sectional view showing the gear inserted through the rotating shaft.

FIG. 4 is a view showing a gear according to a fourth embodiment;
(A) is a front view showing the gear inserted through the rotating shaft,
(B) is a sectional view showing the gear inserted through the rotating shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gear 3 Rotating shaft 4 Teeth 6 Outer diameter part 6a Outer diameter side recessed part 6b Outer diameter side recessed part 8,11 Rubber damper 8a, 11a Damper side convex part 9 Inner diameter part 9a Inner diameter side convex part 11b Damper side recessed part 11c Damper side concave part 11d Damper side protrusion

Claims (6)

[Claims] 1. A gear comprising: an inner diameter portion fixed to a rotating shaft; and an outer diameter portion having teeth formed thereon, wherein the inner diameter portion is made of a rubber material. 2. The gear according to claim 1, wherein the outer peripheral side of the inner diameter portion and the inner peripheral side of the outer diameter portion are provided with projections and depressions that fit in the rotating direction. 3. The gear according to claim 1, wherein the outer peripheral side of the inner diameter portion and the inner peripheral side of the outer diameter portion are provided with projections and depressions which fit in the axial direction. 4. A gear comprising: an inner diameter portion rotatably provided on a rotary shaft; and an outer shape portion having teeth formed thereon, wherein a rubber material is provided between the inner diameter portion and the outer diameter portion. . 5. An outer peripheral side of an inner diameter portion and an inner peripheral side of a rubber material,
5. The gear according to claim 4, wherein the outer peripheral side of the rubber material and the inner peripheral side of the outer diameter portion are provided with concavities and convexities which fit in the rotation direction. 6. An outer peripheral side of an inner diameter portion and an inner peripheral side of a rubber material,
The gear according to claim 4, wherein the outer peripheral side of the rubber material and the inner peripheral side of the outer diameter portion are provided with projections and depressions that fit each other in the axial direction.