JPH06159479A - Power transmission mechanism - Google Patents

Abstract

PURPOSE:To easily assemble and disassemble a gear, a pulley and the like adapted to attached to a motor so as to facilitate the sorting and collection of plastic materials used therefor. CONSTITUTION:A spur gear 101, formed therein a shaft hole 10 having the same sectional shape as that of a rotation checking part provided thereon with face cut parts 22a, 22b of the output shaft 21 of a motor 2, is limited in axial movement by a shoulder part 22c at the terminal ends of the face cut parts 22a, 22b, and a locking member 5. Accordingly, the gear 101 may be fitted on the output shaft 21 of the motor 2 without using a fastening member such as a screw or the like. With this arrangement, plastic materials used in the attachment and removable of the spur gear 10a and the output shaft 21 of the motor 2 and for the spur gear itself may be sorted and collected so as to be easily reused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission mechanism for transmitting a rotational power source such as a motor by a power transmission member such as a gear or a pulley attached to an output shaft of the motor.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5 (1), a gear is generally used for fixing an output shaft of a rotary power source such as a motor, a gear attached to the output shaft, and a power transmission member such as a pulley. , A power transmission member 1 such as a pulley, and an output shaft 21 of a rotary power source 2 such as a motor.
5 (2), a screw hole 11 is provided so as to be orthogonal to the center line of FIG.
As shown in FIG. 5, a method in which a screw hole 23 is provided in the output shaft 21 so as to be orthogonal to the center line, a screw mounting hole 12 is provided in the power transmission member 1 for gears, pulleys, etc., and is fixed by a screw 32. As shown in FIG. 5 (3), the output shaft 21 is provided with a pin hole 24 that is orthogonal to the center line, and similarly, the power transmission member 1 such as a gear and a pulley is also provided with a pin hole 13 so that the press-fitting pin is There is a method of fixing with 33.

In the case of the fixing method using the set screw 31 shown in FIG. 5 (1), the output shaft 21 of the power source 2 is often provided with face cut portions 22a and 22b for preventing rotation. Further, the power transmission member 1 such as a gear and a pulley is often made of plastic for cost reduction and noise reduction, but in the case of the fixing method using the set screw 31 of FIG. To secure the strength of 11,
A method is often used in which the boss portion 1a of the power transmission member 1 in which the screw hole 11 is provided is made of metal, and a gear, a pulley, etc. are plastically formed on the boss portion 1a by insert molding.

The output shafts of stepping motors, DC motors, etc., which are often used for the power source 2, are provided with face cut portions 22a, 22b like the output shaft 21 shown in FIG. 5 (1). Are commercially available as standard manufacturers.

[0005]

According to the above-mentioned prior art, there are the following problems.

(1) Since the power transmission member 1 such as a gear and a pulley is fixed to the output shaft 21, a fastening member such as a set screw 31, a screw 32, and a press-fitting pin 33 is required, which increases the number of parts. It takes time and effort to assemble and disassemble.

(2) Since the screw holes 11 and 22, the screw mounting hole 12 and the pin holes 13 and 24 are processed, the cost increases.

(3) When the power transmission member 1 is integrated with the plastic boss 1a by insert mold molding, it is difficult to separate the plastic and metal at the time of disposal.

The present invention solves these problems by assembling,
An object of the present invention is to provide a power transmission mechanism having a structure that can be easily disassembled and the plastic material used for parts can be easily separated and collected.

[0010]

In order to solve the above problems, the present invention comprises a rotary power source such as a motor and a power transmission member such as a gear and a pulley attached to the rotary power source as follows. did.

(1) A power transmission member such as a gear or a pulley that is attached to a rotary power source such as a motor having a detent portion such as a face cut at one end of the output shaft is provided at one end of the output shaft. It has a hole having the same cross-sectional shape as that of the whirl-stop portion that fits into the whirl-stop portion such as a face cut.

(2) One end of the power transmission member is stopped by a stepped portion at the end of the rotation stopping portion provided on the output shaft or one end of a non-moving member in the periphery, and the other end is connected to the power transmission member. The axial movement of the power transmission member with respect to the output shaft is regulated by stopping the system by the other end of the power transmission member or the non-moving member around the system.

[0013]

Operation: A surface cut or the like provided at one end of the output shaft to a power transmission member such as a gear or a pulley attached to a rotary power source such as a motor having a rotation stop portion such as a surface cut at one end of the output shaft By providing a hole having the same cross-sectional shape as that of the anti-rotation part that fits into the anti-rotation part, the power transmission member such as the gear and the pulley can slip integrally with the output shaft only by inserting it into the output shaft. Can rotate without.

Further, one end of the power transmission member is stopped by a stepped portion at the end of the rotation stopping portion provided on the output shaft or one end of a non-moving member in the periphery, and the other end is connected to the power transmission member. The axial movement of the power transmission member with respect to the output shaft can be regulated by stopping the system by one end of another power transmission member or a non-moving member around the power transmission member.

As described above, the power transmission member can be fixed to a predetermined position of the output shaft without using a fastening member such as a screw or a pin, and a power transmission mechanism which can be easily assembled and disassembled can be realized.

Further, since a fastening member such as a screw is not required, a metal boss that secures the strength of the screw hole is not required when the power transmission member is made of plastic, and the processing cost can be reduced and at the time of disposal. It becomes easy to separate and collect.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a perspective view of a first embodiment of the present invention, FIG. 2 is a sectional view of FIG. 1 seen from the direction of arrow A, and FIG. 3 is a perspective view of a second embodiment of the present invention. 4 is a sectional view as seen from the direction of arrow A in FIG.

First, in FIGS. 1 and 2, the spur gear 101, which is the power transmission member 1, is provided with surface cut portions 22a and 22b of the output shaft 21 of the motor 2, which is a rotational power source, and is provided with a detent. A shaft hole 10 having the same cross-sectional shape as the portion is provided. The shaft hole 10 is slightly larger than the cross section of the rotation preventing portion of the output shaft 21 where the face cut portions 22a and 22b are provided so that the spur gear 101 can be easily inserted into the output shaft 21 by hand. And the right end surface R of the spur gear 101 has the surface cut portions 22a, 22b.
Is inserted until it hits the step 22c at the end of
At this position, the movement of the output shaft 21 to the right in the axial direction is restricted.

The motor 2 is inserted into the output shaft 21 until the right end surface R of the spur gear 101 hits the step portion 22c at the end of the surface cut portions 22a and 22b.
When fixed to the mounting bracket 4 with the screw 6 and the nut 7, a part of the transmission mechanism for mounting the motor 2 is separated from the left end face L of the spur gear 101 with a minute gap d. A system stop member 5 composed of
The movement of the spur gear 101 to the left in the axial direction with respect to the output shaft 21 is restricted.

As a result of the above, the spur gear 101 has the output shaft 2
Fixed in the axial direction of 1 with a play of a minute gap d,
The rotational power of the motor 2 is transmitted to the spur gear of the next stage (not shown) without dropping off from the output shaft 21.

During operation, the spur gear 101 moves the minute gap d.
Although it may slide in the direction of the axis and slide with the system stop member 5,
The spur gear 101 of this embodiment or a power transmission member such as a belt pulley that transmits power by a belt similar to this has a small axial thrust load acting during operation, and the spur gear 101 and other power transmission members 1 If a polyacetal-based or nylon-based resin material having a low friction coefficient, self-lubricating property, and abrasion resistance is used, the sliding portion of the spur gear 101 or the like for the power transmission member 1 and the system stopping member 5 will be used. It can be put to practical use without wearing or increasing the load.

Next, a second embodiment of the present invention shown in FIGS. 3 and 4 will be described.

Instead of the spur gear 101 which is the power transmission member 1 shown in FIGS. 1 and 2, the output shaft 21 is mounted with a large axial thrust load acting during operation and also with a small axial play. This is an example applied to a method of fixing a power transmission member such as the bevel gear 102 which is necessary.

To move the bevel gear 102 to the right in the axial direction of the shaft hole 10 and the output shaft 21, as with the spur gear 101, the bevel gear 102 is manually inserted into the output shaft 21 and the right end surface R of the bevel gear 102 is The output shaft 21 is abutted against the stepped portion 22c at the end of the surface cut portions 22a and 22b to regulate the surface.

On the other hand, the movement of the bevel gear 102 to the left side in the axial direction of the output shaft 21 utilizes the fact that the tooth surface of the bevel gear 102 can be locked to the next stage bevel gear 103 which is in engagement with the bevel gear 102. Like the spur gear 101, the motor 2 is attached to the mounting bracket 4 in a state where the right end surface R of the bevel gear 102 is inserted into the output shaft 21 until it abuts on the step portion 22c at the end of the surface cut portions 22a and 22b. When fixed by the screws 6 and the nut 7, the bevel gear 102 is fixed between the step portion 22c and the bevel gear 103 at the next stage with its axial movement with respect to the output shaft 21 being restricted.

On the other hand, the bevel gear 102 and the bevel gear 1 at the next stage
In order to smoothly transmit power between No. 03 and No. 03, it is necessary to maintain an appropriate backlash (backlash) between the bevel gear 102 and the bevel gear 103 of the next stage, but due to component accuracy,
When it is necessary to adjust this, at the mounting portion of the mounting bracket 4 of the motor 2 to the transmission mechanism (not shown) mounting the motor 2, as shown in FIGS. When the mounting bracket 4 is mounted by providing the insertion hole 41 of the fixing screw 8 of the mounting bracket 4 in an oval parallel to the output shaft 21 so that the motor 102 can be moved in the direction of arrow B in FIG. In addition, the backlash between the bevel gear 102 and the bevel gear 103 of the next stage can be appropriately adjusted and fixed while moving in the direction of arrow B in FIG.

The power transmission member 1 such as the spur gear 101 and the bevel gear 102 can be manufactured at a low cost by injection molding using a thermoplastic resin such as polyacetal or nylon. is there.

[0029]

As described above, the present invention has the following effects.

(1) Since power transmission members such as gears and pulleys attached to the output shaft of a rotary power source such as a motor can be fixed with one touch without fastening members such as screws and pins, assembly and disassembly are possible. The cost required for can be reduced.

(2) Power transmission members such as gears and pulleys are
Since it can be easily molded with a thermoplastic resin plain material, it is inexpensive, and at the time of disposal, the thermoplastic resin used can be easily separated and collected, and reuse can be facilitated. .

(3) For power transmission members such as gears and pulleys,
Since it is not necessary to form a hole for attaching a fastening member such as a screw or a pin, the power transmission member can be manufactured at a lower cost.

(4) In the case of using a standard maker having a rotary power source such as a motor having a rotation stopping portion such as a face cut on its output shaft in advance, this is directly used as a gear or a gear. It can be used to fix a power transmission member such as a pulley, and post-processing for fixing a fastening member such as a screw hole to the output shaft is not necessary. Especially, in a small-volume production device, the cost reduction effect is great. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a power transmission mechanism that is a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the power transmission mechanism of FIG. 1 viewed from the direction of arrow A in FIG.

FIG. 3 is a perspective view showing a power transmission mechanism that is a second embodiment of the present invention.

4 is a cross-sectional view of the power transmission mechanism of FIG. 3 viewed from the direction of arrow A in FIG.

FIG. 5 is a perspective view showing a conventional example.

[Explanation of symbols]

1 ... Power transmission member, 2 ... Motor, 4 ... Mounting bracket, 5
... System stop member, 10 ... Shaft hole, 21 ... Output shaft, 22a, 22
b ... surface cut portion, 22c ... step portion, 41 ... insertion hole, 10
1 ... Spur gear, 102 ... Bevel gear, 103 ... Bevel gear at the next stage

Claims (1)

[Claims] 1. A rotary power source having a rotation-stopping portion such as a face cut on an output shaft, and a hole having the same cross-sectional shape as the rotation-stopping portion attached to the output shaft and fitted into the rotation-stopping portion of the output shaft. A power transmission member having one end stopped by a stepped portion provided on the output shaft or one end of a non-moving member in the periphery,
A means provided on the other end of the power transmission member for restricting axial movement of the power transmission member with respect to the output shaft by another power transmission member associated with the power transmission member or a peripheral non-moving member. Power transmission mechanism characterized by.