JPH0648046B2 - Power transmission device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a power transmission device, and more particularly to a power transmission device, which includes a first support shaft that supports a drive-side gear and a second support shaft that supports a driven-side gear. The present invention relates to a power transmission device having a configuration condition that the rotation speed of a gear is different from each other, while the rotation speed of the other gear is constant.

[Prior art]

For example, a drive system of various consumer equipment such as an electrophotographic copying machine and a man conveyor often requires a predetermined (constant) rotation speed.

On the other hand, the commercial power supply, which is the power supply for these consumer appliances, has a different power supply frequency of 50 hertz and 60 hertz depending on the region, and therefore the rotation speed of the motor is different by about 20%.
Therefore, when a predetermined (constant) rotation speed is required as described above, for example, by changing the number of gear teeth in the drive system, the drive transmission device for the commercial power supply of 50 Hertz and the drive transmission for the commercial power supply of 60 Hertz are transmitted. It is necessary to separately manufacture the device and take in the drive transmission device separately according to the power supply frequency to be used, resulting in complexity and high cost of production and installation.

In addition, separately from this, even when the rotational speed of the drive side rotating shaft is constant, while the number of rotations of the driven side rotating shaft is different, the number of teeth of the gear in the drive system is changed to It is necessary to produce and install a drive transmission device according to the rotation speed, which results in poor productivity and high cost.

〔Purpose〕

The object of the present invention is to eliminate such drawbacks of the prior art,
An object of the present invention is to provide an inexpensive power transmission device with good productivity.

〔Constitution〕

In order to achieve the above-mentioned object, according to the present invention, a first supporting shaft such as a driving side rotating shaft that supports a driving side gear and a second supporting shaft such as a driven side rotating shaft that supports a driven side gear are parallel to each other. The drive-side gear and the driven-side gear mesh with each other, and the rotational speed of one of the drive-side gear and the driven-side gear is different from that of the other gear. In a power transmission device having a constant rotation speed, at least a first-stage gear unit in which gears supported by one of the first support shaft and the second support shaft are arranged side by side in the axial direction. And a second-stage gear section,
The stepped gear portion and the second stepped gear portion are configured such that the number of teeth and the axial center position of each tooth bottom coincide with each other, and the diameter and module of the gear portion are different, and the first support shaft and the second support As a gear that is replaceably attached to one of the other supporting shafts, at least a first replacement gear that can mesh with the first-stage gear portion,
A second exchange gear capable of meshing with the second-stage gear portion is provided.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. First
FIG. 2 and FIG. 2 are cross-sectional views of a power transmission device for explaining the difference in configuration when the power supply frequency is different, and FIG. 3 is a perspective view of a driven gear used in the power transmission device.

In these figures, 1 is a drive motor, 2 is a gear head,
Reference numeral 3 is a drive side rotating shaft, and 4 is a base plate attached to the gear head 2. Reference numeral 5 denotes a driven-side rotating shaft which is arranged in parallel with the driving-side rotating shaft 3 and is rotatably supported by a bearing 8 placed in contact with the main plate 4 and a bearing 7 installed in the gear case 6.

A driven gear 9 is fixed to a predetermined position of the driven rotating shaft 5, and the driven gear 9 has a large-diameter first-stage gear portion 10 and a small-diameter second-stage gear portion 11 arranged side by side in the axial direction. It is composed of one and.

On the other hand, with respect to the drive-side rotating shaft 3, as shown in FIG. 1, a small-diameter first replacement gear 1 that meshes with the first-stage gear portion 10.
2 is attached, or as shown in FIG. 2, a large diameter second exchange gear 13 that meshes with the second stage gear portion 11
The gears 12, 13 are replaceable so that they can be mounted. Reference numeral 14 is an exchange hole for exchanging and attaching the gears 12, 13.

As described above, the commercial power source has frequencies of 50 hertz and 60 hertz depending on the region, and the rotational speed of the drive motor 1 (driving-side rotary shaft 3) varies depending on the power source frequency. On the other hand, when the drive motor 1 is used as a drive source in consumer equipment such as an electrophotographic copying machine, the rotation speed of the driven-side rotary shaft 5 serving as an output end needs to be constant regardless of the power supply frequency. . Therefore, the power supply frequency is 6
In the case of 0 hertz, that is, when the rotation speed of the drive-side rotary shaft 3 is high, as shown in FIG. 1, the drive-side rotary shaft 3 is fitted with the first exchange gear 12 of the small diameter to form the large-diameter first stage gear. By engaging with the portion 10, the speed is reduced and the driven side rotating shaft 5
To obtain the desired rotation speed.

On the other hand, when the power supply frequency is 50 hertz, that is, when the rotation speed of the drive-side rotating shaft 3 is slow, as shown in FIG. By meshing with the second stage gear part 11 of
Acceleration is performed so that the same rotation speed as in the case of the power source frequency of 60 Hz is obtained from the driven-side rotation shaft 5.

In order to allow the gears 12 and 13 to be interchangeably mounted through the hole 14, the second-stage gear portion 11 near the hole 14 must have a smaller diameter than the first-stage gear portion 10.

By the way, when standard teeth are used as the first-stage gear unit 10 and the second-stage gear unit 11, since the tooth length is 2.25 M (M; module), the number of teeth of the second-stage gear unit 11 is the first. It is necessary that the number of teeth of the stepped gear portion 10 is five or more. This condition can be generally realized when the rotation speed ratio is 1: 1.5 or more. However, in order to obtain a constant rotation speed by eliminating the difference in rotation speed due to the difference in power supply frequency between 50 Hz and 60 Hz by the transmission mechanism, the rotation speed ratio is set to 1
It should be 1.2. Standard teeth with rotation speed of 1: 1.2
If designed so that the outer diameter of the second-stage gear portion 11 is the first
Since the diameter is larger than the tooth bottom diameter of the stepped gear portion 10, in the method of using the same tooth length, the first replacement gear portion 12 is connected to the drive side rotary shaft 3
There is a problem that the second-stage gear unit 11 interferes with the second gear unit and cannot be replaced.

Therefore, in the present invention, the large-diameter first gear in the driven gear 9 is used.
The number of teeth of the stepped gear portion 10 and the second stepped gear portion 11 having a small diameter are the same, and the difference in diameter between the two gear portions 10 and 11 is absorbed by changing the module of each tooth.
The module is the diameter of the pitch circle in the gear (D).
Is divided by the number of teeth (Z) (D / Z). In this way, the module is installed in the first stage gear unit 10 and the second stage gear unit 11
And the first-stage gear unit 1 as shown in FIG.
0 so that the axial center position of each tooth bottom 15 coincides with the axial center position of each tooth bottom 15 'of the second stage gear portion 11, that is, the tooth bottom 15 and the tooth bottom 15' are displaced in the circumferential direction. It is provided so as not to exist.

As described above, the number of teeth of the first-stage gear portion 10 and the second-stage gear portion 11 and the axial center position of each tooth bottom are made to coincide with each other, and the diameters and modules of both gear portions 10 and 11 are made different from each other. The first exchange gear 12 shown in the drawing can be extracted from the exchange hole 14 through the teeth of the second-stage gear portion 11 without interference.

In the above embodiment, the first gear is a gear having a plurality of stages of gears.
The case where the two gear parts of the step gear part and the second gear part are arranged in parallel has been described, but three or more gear parts may be arranged in parallel.

In the above-described embodiment, the case where the support shafts that respectively support the drive side gear and the driven side gear rotate has been described, but the present invention is not limited to this, and either one of the support shafts or both of the support shafts Is a fixed type, and can be applied to a case where a gear is rotatably supported on a fixed support shaft.

In the above embodiment, a replaceable gear is attached to the first support shaft,
Although the case where the gear having a plurality of stages of gears is fixed to the second support shaft has been described, the present invention is not limited to this, and the gear having a plurality of stages of gears is fixed to the first support shaft. Then, it is possible to attach a replaceable gear to the second support shaft.

Further, in the above embodiment, the case where the rotation speed of the driven gear is constant while the rotation speed of the driven gear is different is described, but the rotation speed of the driven gear is constant and the rotation speed of the driven gear is constant. The present invention can be applied to the case where a plurality of different numbers are used.

〔effect〕

Since the present invention has the above-mentioned configuration, it is not necessary to produce a dedicated power transmission device according to the rotation speed of the gear as in the conventional case, and the gears can be shared,
It is possible to provide a low cost power transmission device with high productivity.

[Brief description of drawings]

The drawings are all for explaining the embodiments of the present invention.
FIG. 2 and FIG. 2 are cross-sectional views of a power transmission device for explaining the difference in configuration when power supply frequencies are different, and FIG. 3 is a perspective view of a driven gear used in the power transmission device. 1 ... driving motor, 2 ... gear head, 3 ... driving side rotating shaft, 4 ... ground plate, 5 ... driven side rotating shaft, 6 ... gear case, 7,8 ... bearing, 9 ... driven side Gears, 10 ... First stage gear part, 11 ... Second stage gear part, 12 ... First exchange gear, 13 ... Second stage exchange gear, 14 ... Exchange hole, 1
5,15 '... Bottom of tooth.

Front page continuation (72) Inventor Eiichi Kato 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. Within the corporation

Claims (4)

[Claims] 1. A first support shaft for supporting a drive-side gear and a second support shaft for supporting a driven-side gear are arranged in parallel, and the drive-side gear and the driven-side gear mesh with each other to form a drive-side gear and In a power transmission device in which one of the driven-side gears has a plurality of different rotation speeds, while the other gear has a constant rotation speed, the first support shaft and the second support shaft have different rotation speeds. The gear supported by any one of the support shafts has at least a first-stage gear portion and a second-stage gear portion that are arranged side by side in the axial direction.
The stepped gear portion and the second gear portion are configured such that the number of teeth and the axial center position of each tooth bottom match each other, and the diameter and module of the gear portion are different from each other, and the first support shaft and the second support shaft As a gear that is replaceably attached to one of the other supporting shafts, at least a first replacement gear that can mesh with the first-stage gear portion,
A power transmission device, comprising: a second exchange gear capable of meshing with the second-stage gear portion. 2. A power transmission device according to claim 1, wherein a plurality of rotation speeds of the drive-side gears are different depending on a power supply frequency. 3. In claim (1), the first stage gear portion is designed to have a large diameter and the second stage gear portion is designed to have a small diameter.
A power transmission device, wherein a first exchange gear that can mesh with the first-stage gear portion is configured to be disengaged from the first-stage gear portion along the second-stage gear portion with respect to the support shaft. 4. The first support shaft according to claim 1, wherein the first support shaft and the second support shaft are provided in a gear case arranged at one end of the drive motor, and a base end of the first support shaft is provided. Is connected to the drive motor, and a hole for gear replacement is provided in a portion of the gear case facing the other end of the first support shaft.
The exchange gear is attached to the support shaft in a replaceable manner, the second support shaft is supported on both sides by bearings, and the first stage gear portion is designed to have a large diameter and the second stage gear portion is designed to have a small diameter. The power transmission device, wherein the first stage gear portion is supported by the second support shaft such that the second stage gear portion is arranged on the drive motor side and the second stage gear portion is arranged on the exchange hole side.