JPH04331848A - Transmission mechanism unit for rotary equipment - Google Patents

Abstract

PURPOSE:To provide a transmission mechanism unit which can be easily operation-connected with the revolution equipment as driven device and develop the performance of a small-sized dc motor having a limitted capacity to the max. degree. CONSTITUTION:A planetary gear device P operation-connected with a small-sized dc motor is built in a cylindrical housing 3 on which the motor is fixed in demountable manner on one side. The planetary gear device P includes a revolution transmission member 4 which has a joint part 10 for the connection of the driving shaft of the rotary equipment as driven device, and the revolution of the motor 1 is deceleration-transmitted through the planetary gear device P to the driving shaft. Further, a plurality of inertia increasing mass bodies 11 are installed at proper positions on the revolution transmission member.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention has a cylindrical housing with a small DC motor as a power source detachably fixed to one side thereof, and a planetary gear set built therein, and the motor and the planetary gear set being operatively connected. The whole is made into one single entity,
The present invention relates to a transmission mechanism unit for a rotating device that can be connected to a small rotating device such as a rotary pump and used as a drive/transmission device for the device.

0002

[Prior Art] Conventionally, when a small DC motor is used as a power source for a small rotating device such as a rotary pump, the method for operatively connecting the two is generally to connect the output shaft of the motor and the drive shaft of the rotating device. A method was used in which the parts were directly connected via a shaft joint such as a flange joint.

0003

[Problem to be solved by the invention] When connecting two shafts using, for example, a flange joint and a joint bolt, "centering" using the joint surface is essential. This must be done with sufficient accuracy, which is not only time-consuming, but if done incorrectly, it can cause problems such as generation of vibration, heating of the bearing, and seizure of the metal.

[0004] Therefore, the inventor of the present invention first connected the joint of the output shaft of the motor and the joint of the drive shaft of the rotating equipment with a braided wire, thereby making it possible to directly connect the two shafts even if there is a difference in level between them. proposed a joint device that can be used (see, for example, Japanese Utility Model Publication No. 51-27390 and Japanese Utility Model Publication No. 52-20608). However, in these joint devices, when the motor power is transmitted, the braided wire serving as the means for connecting the two axes expands and contracts, causing the connecting portion to cause "conical motion" or "striking motion." It has been found that, as a result, problems similar to those caused by incorrect centering as described above may occur.

Furthermore, when a two-shaft direct connection system is used and a small DC motor is used as the power source, its capacity is limited, so if the load on the rotating equipment increases beyond a certain level, The load is applied to the motor, causing strain, and the motor itself is likely to burn out. This tendency is particularly common when the rotating equipment requires a relatively large rotational torque for its operation, such as a hydraulically driven gear pump that requires a relatively high discharge pressure.

The main object of the present invention is to eliminate the above-mentioned inconveniences and shortcomings found in conventional branching techniques, and to provide a device which can be easily connected to a rotating device as a driven device and which has a limited capacity. An object of the present invention is to provide a transmission mechanism unit for rotating equipment configured to maximize the performance of a small DC motor.

[0007]

[Means for Solving the Problems] In order to achieve the above object, in the transmission mechanism unit for rotating equipment according to the present invention, a small DC motor is attached to one side of the cylindrical housing in a detachable manner, and the motor is actuated by the cylindrical housing. A connected planetary gear device is built in, and the planetary gear device includes planetary gears loosely fitted to a plurality of support shafts protruding from one side of the rotation transmission member.
The cylindrical housing has internal gears provided on the inner circumferential surface of the cylindrical housing. A joint portion capable of connecting a drive shaft of a rotating device is provided, and the rotation of the output shaft of the motor is slowed down through the planetary gear device to the drive shaft of the rotating device connected to the joint portion. The present invention is characterized in that a plurality of inertia increasing mass bodies are respectively attached to appropriate positions of the rotation transmitting member.

[0008] The rotation transmitting member has a shaft insertion hole bored in the center of the side on which the support shaft protrudes for reasons to be described later, and this shaft insertion hole is loosely fitted into the first half of the output shaft of the motor. It is desirable to

[0009] Furthermore, the joint portion may be configured as a boss-like protrusion capable of fitting and locking the tip end of a drive shaft of a small rotary device.

Furthermore, the cylindrical housing, the planetary gear, and the driving hinion are each molded from synthetic resin, and the internal gear is made of synthetic resin.
The rotation transmission member is molded integrally with the cylindrical housing, and all of the rotation transmission members are molded from synthetic resin except for the support shaft of the planetary gear and the mass body for increasing inertia, and the support shaft and the mass body for increasing inertia are made of brass. It is preferable to integrally mold the material using such an alloy.

Furthermore, it is preferable that the other side of the cylindrical housing to which the small DC motor is detachably fixed to one side be provided with attachment means for fixing the transmission mechanism unit to the small rotating device.

Furthermore, it is preferable that a synthetic resin cover having a circular opening in the center that surrounds the boss-like protrusion with a slight gap left is fitted into the other opening of the cylindrical housing.

[0013]

[Operation] When the drive shaft of a rotating device is connected to the joint part of the rotation transmission member and the motor is started with the cylindrical housing fixed, the rotation of the motor is decelerated by the planetary gear system, and the rotation of the motor is reduced by the planetary gear system. A large rotational torque is transmitted to the drive shaft of the rotating equipment. Furthermore, since a plurality of mass bodies for increasing inertia are attached to the rotation transmission member, the rotation transmission member itself functions as a flywheel having a large moment of inertia, so that the rotation transmission member can be smoothly and uniformly operated. transmits rotational torque to.

[0014]

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 3 show an embodiment of the present invention. The transmission mechanism unit U in this embodiment is made up of a cylindrical housing 3 to which a small DC motor 1 is removably fixed to one side with screws 2, etc., and a planetary gear unit P operatively connected to the motor 1 built therein. The planetary gear device P has planetary gears 6 loosely fitted on three support shafts 5 protruding from one side of the rotation transmitting member 4 at the same angular position, respectively, on the inner periphery of the cylindrical housing 3. Internal gear 7 provided in an annular shape at a suitable location on the surface
and the output shaft 1 of the motor 1.
A drive pinion 8 having a smaller diameter than the planetary gear 6 fixed at A
They are constructed by interlocking with each other. The rotation transmission member 4 has a drive shaft 9 of a small rotary device R (see FIG. 7) such as a rotary pump on the side opposite to the side on which the support shaft 5 is protruded.
A joint portion 10 is provided, and by connecting a drive shaft 9 of a rotating device R to the joint portion 10, the motor is connected to the drive shaft 9 via a planetary gear system P. The rotation of the output shaft 1A can be reduced and transmitted at a constant reduction ratio. In addition, since the rotation transmitting member 4 also functions as a flywheel, the rotation transmitting member 4 is located at the same angular position on the same circumference near its outer periphery, that is, in the illustrated example, approximately Three inertia increasing mass bodies 11 are respectively attached to the corner portions of the equilateral triangular plate portion 4A.

A shaft insertion hole 12 is formed in the center of the rotation transmission member 4 on the side where the support shaft 5 protrudes, and this shaft insertion hole 12 is inserted into the front half of the output shaft 1A of the motor 1. It is loosely fitted. Furthermore, in the illustrated example, the joint portion 10 of the rotation transmission member 4 described above is capable of fitting and locking the distal end portion 9' of the drive shaft 9 of a rotating device that is a driven device. It consists of a boss-like protrusion 14 having a locking hole 13 coaxially provided with the shaft insertion hole 12, and the drive shaft 9
The drive shaft 9 can be connected simply by fitting and locking the tip end 9' into the locking hole 13.

The cylindrical housing 3, the planetary gear 6 and the drive pinion 8 are each molded from synthetic resin, and the internal gear 7
is molded integrally with the cylindrical housing 3, and the rotation transmission member 4 is also molded entirely of synthetic resin except for the support shaft 5 of the planetary gear and the mass body 11 for increasing inertia. The mass body 11 is integrally molded from an alloy such as brass, and of the two integrally molded mass bodies 1, the mass body 1 for increasing inertia is
As shown in FIG. 3, the portion 1 is integrally implanted in the synthetic resin main body portion of the rotation transmission member 4.

The other side of the cylindrical housing 3, that is,
Opening 3A on the side opposite to the side to which the motor 1 is fixed
Attachment means for fixing the transmission mechanism unit U to a small rotating device R, which is a driven device, is provided around the periphery. In the illustrated example, this mounting means includes screw insertion holes 15 each provided corresponding to a plurality of synthetic resin mounting bosses RB arranged on the side from which the drive shaft 9 of the rotating device R projects.
The ear piece 16 has a screw insertion hole 15 of the ear piece 16.
is aligned with the boss hole RB' of the mounting boss RB, and the screw 17 is forcibly screwed into the boss hole RB' from the outside of the lug 16 through the screw insertion hole 15, thereby rotating the transmission mechanism unit U. It can be easily attached to equipment R. In the figure, 3A is a partition wall of the housing.

FIGS. 4 to 7 show other embodiments of the present invention. In the transmission mechanism unit U' in this embodiment, which is configured as described above, a boss-like projection constituting the joint portion 10 of the rotation transmission member 4 is provided in the other side opening 3A of the cylindrical housing 3. 14 is fitted with a synthetic resin cover 19 provided in the center with a circular opening 18 surrounding it with a slight annular gap C1.

The cover 19 is provided with an annular protrusion 20 and a truncated conical protrusion 21 on one side thereof, which can elastically engage with the inner peripheral surface of the opening 3A of the cylindrical housing 3. The circular opening 18 described above is formed at the center of this protrusion 21 (see FIG. 6). Reference numeral 22 indicates a mounting boss having a screw insertion hole 23 therethrough, and reference numeral 24 indicates an annular spacer provided with a notch 25.

As clearly shown in FIGS. 4 and 6, the boss-shaped projection 14 has a circular base 1 concentric with it and having a large diameter.
4A, and connects the cover 19 to the cylindrical housing 3.
As shown in FIG. 6, in addition to the slight annular gap C1 between the boss-shaped projection 14 and the circumferential surface 18' of the circular opening 18, A slight annular gap C2 is also formed between the annular front surface 14B and the annular top surface 21' of the truncated conical projection 21 described above.

The transmission mechanism unit U' with the cover 19 fitted in this way is itself
This not only makes it possible to prevent dust and the like from entering the internal mechanism from the outside, but also when this is fixed to, for example, a gear pump R as a small rotating device, the cover 19 is interposed between the two. The boss-like protrusion of the rotation transmission member 4 acts as a partition wall to prevent leakage liquid from entering from the pump side, and allows the leakage liquid to be discharged through the notch 25. The annular front surface 14B of the circular base 14A acts as a kind of radial bearing of the rotation transmitting member 4 to smooth the rotation of the rotation transmitting member 4, and when it slides in the direction of the rotating equipment R,
Since it comes into contact with the annular top surface 21' of the truncated conical projection 21 of No. 9 and is prevented from sliding further, it also functions as a kind of slide bearing for the rotation transmission member 4.

The synthetic resin used as the molding material for the cylindrical housing 3, the planetary gear 6, and the drive pinion 8 has properties such as moldability, machinability, dimensional stability, abrasion resistance, heat resistance, and self-lubricating property. A good material, such as acetal resin, is suitable as the molding material for the main body of the rotation transmission member 4.
A material with high strength that can sufficiently withstand the mechanical load received during transmission of rotational torque, such as polyimide resin, reinforced nylon resin, etc., is suitable. If the drive pinion 8 is molded from the synthetic resin as described above, the drive pinion can be simply press-fitted elastically into the output shaft 1A of the motor 1.
It can be firmly fixed to A, and the installation work is extremely simple.

In the transmission mechanism unit according to the present invention, the motor 1 has an outer diameter of about 2.9 cm and a main body length of about 4 cm.
m, overall weight: about 80 g A commercially available small motor (for example, Mabuchi Motor (trade name) RS-380PH (model code) series can be used). In this case, for example, the rotation speed at maximum efficiency is 5280 rpm.
It has been found through experiments that using a pump with a rotation speed of from m to 13,080 rrm and reducing the rotation speed to about 1/3 to 1/5 is suitable at least for general small gear pumps. .

[0025] Since the present invention is constructed as described above, it produces the effects described below.

In the transmission mechanism unit of claims 1 and 2, it is possible to easily connect the transmission mechanism to a small rotating device as a driven device, and the rotation of the small DC motor is
Since the speed is reduced by the planetary gear system, a large rotational torque can be transmitted to the drive shaft of the rotating equipment, while
Since a plurality of mass bodies for increasing inertia are attached to the rotation transmission member, the rotation transmission member itself acts as a flywheel having a large moment of inertia, and can transmit rotational torque smoothly and uniformly. This makes it possible to maximize the performance of small DC motors with limited capacity.

In the transmission mechanism unit according to claim 3,
Since the shaft insertion hole drilled in the center of the protruding side of the rotation transmission member is loosely fitted into the front half of the output shaft of the motor, the rotation transmission member rotates about the output shaft. Therefore, it is possible to rotate smoothly without causing "conical motion" or "sloping motion" when transmitting motor power.

In the transmission mechanism unit according to claim 4,
The joint portion of the rotation transmission member is composed of a boss-like projection having a locking hole that can fit and lock the tip of the drive shaft on the rotating equipment side. The rotary device and the transmission mechanism unit can be operatively connected by simply fitting and locking the rotary device into the stop hole.

In the transmission mechanism unit according to claim 5,
Since most of the components of the planetary gear device are made of synthetic resin, it is easy to manufacture and can be provided at low cost.

In the transmission mechanism unit according to claim 6,
A small DC motor is detachably fixed to one side of the cylindrical housing, and a mounting means for fixing the transmission mechanism unit to a small rotating device is provided on the other side of the cylindrical housing, making it easy to attach the transmission mechanism unit to the rotating device.

In the transmission mechanism unit according to claim 7,
A small DC motor is removably fixed to one side of the cylindrical housing.The other side of the housing has a circular opening surrounding the boss-shaped protrusion that forms the joint of the rotation transmission member, leaving a slight annular gap in the center. Since the provided synthetic resin cover is fitted, the circumferential surface of the circular opening acts as a kind of radial bearing for the boss-shaped projection, so that the rotation transmission member can rotate smoothly.

In the transmission mechanism unit according to claim 8,
When the transmission mechanism unit is fixed to a small rotating device, the synthetic resin cover acts as a partition between the two, so if the rotating device is a rotary pump such as a gear pump, for example, It is possible to prevent leakage liquid etc. from entering from the pump side and protect the internal mechanism.

In the transmission mechanism unit according to claim 9,
Since the rotating device is a rotary pump such as a gear pump, by connecting the two, a portable electric rotary pump that can be used for various purposes can be constructed.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a front view of the assembled embodiment of the embodiment shown in FIG. 1;

FIG. 3 is a partially longitudinal side view of FIG. 2;

FIG. 4 is an exploded perspective view of another embodiment of the invention.

FIG. 5 is a perspective view of the embodiment of FIG. 4 in an assembled state;

FIG. 6 is a partially longitudinal side view of FIG. 5;

FIG. 7 is a perspective view showing how the transmission mechanism unit shown in FIG. 5 is attached to a rotating device.

[Explanation of symbols]

U Transmission mechanism unit U′ Transmission mechanism unit I Small DC motor IA Output shaft 3. Cylindrical housing 3A Opening P Planetary gear system 4 Rotation transmission member 5 Support shaft 6 Planetary gear 7 Internal gear 8 Drive pinion R Small rotating equipment 9 Drive shaft of small rotating equipment 10 Joint part 11 Mass body for increasing inertia 12 Shaft insertion hole 13 Locking hole RB Mounting boss RB' Boss hole 14 Boss-like projection 14A Circular base 15 Screw insertion hole 16 Ear piece 17 Screw 18 Circular opening 19 Synthetic resin cover 20 Annular ridge 21 truncated conical projection C1 Annular gap 22 Mounting boss 23 Screw insertion hole 24 Annular spacer 25 Notch

Claims (9)

[Claims] Claim 1: A cylindrical housing having a small DC motor removably fixed to one side thereof has a built-in planetary gear set operatively connected to the motor, the planetary gear set protruding from one side of the rotation transmitting member. Planetary gears loosely fitted on the plurality of support shafts provided are inscribed in internal gears provided on the inner circumferential surface of the cylindrical housing, and meshed with drive pinions fixed to the output shaft of the motor. and configure
The other side of the rotation transmission member is provided with a joint portion to which a drive shaft of a small rotating device can be connected, and the drive shaft of the rotating device connected to this joint portion is connected to the drive shaft of the rotating device via the planetary gear device. A transmission mechanism unit for a rotating device, characterized in that the rotation of the output shaft of the motor is transmitted at a reduced speed, and a plurality of inertia increasing mass bodies are respectively attached to appropriate positions of the rotation transmission member. 2. A cylindrical housing to which a small DC motor is removably fixed on one side has a built-in planetary gear device operatively connected to the motor, and the planetary gear device has a small DC motor attached to one side of the rotation transmitting member. planetary gears loosely fitted on three support shafts protruding from corner positions of the cylindrical housing are respectively inscribed in internal gears provided on the inner circumferential surface of the cylindrical housing and fixed to the output shaft of the motor; A joint portion is provided on the other side of the rotation transmission member to which the drive shaft of a small rotating device can be connected, and the drive shaft of the rotating device connected to this joint portion is configured to mesh with the drive pinion. The shaft is configured to transmit the rotation of the output shaft of the motor at a reduced speed via the planetary gear device, and three inertia increasing mass bodies are respectively attached to the same angular position of the rotation transmission member. A transmission mechanism unit for rotating equipment characterized by the following. 3. In the transmission mechanism unit for rotating equipment according to claim 1 or 2, a shaft insertion hole is bored in the center of the side of the rotation transmission member on which the support shaft is protruded, and the shaft insertion hole is made compact. A transmission mechanism unit characterized by being loosely fitted to the first half of the output shaft of a DC motor. 4. In the transmission mechanism unit for a rotating device according to claim 1, the joint portion of the rotation transmitting member capable of connecting a drive shaft of a small rotating device includes:
A power transmission mechanism unit comprising a boss-like projection having a locking hole into which the tip of the drive shaft can be fitted and locked. 5. The transmission mechanism unit for rotating equipment according to claim 1, wherein the cylindrical housing, the planetary gear, and the drive pinion are each molded from synthetic resin, and the internal gear is molded from the cylindrical housing. Molded integrally with the shaped housing,
The rotation transmission member shall be molded entirely of synthetic resin except for the support shaft of the planetary gear and the mass body for increasing inertia, and the support shaft and the mass body for increasing inertia shall be integrally molded from an alloy such as brass. A power transmission unit featuring: 6. The transmission mechanism unit for rotating equipment according to claim 1, 2, 3, 4, or 5, wherein the cylindrical housing has a small DC motor removably fixed to one side thereof, and the other side of the cylindrical housing has a small DC motor attached thereto.
A power transmission mechanism unit characterized in that it is provided with a mounting means for fixing the transmission mechanism unit to a small rotary ram. 7. The transmission mechanism unit for rotating equipment according to claim 4, 5 or 6, wherein a joint of the rotation transmission member is provided in an opening on the other side of the cylindrical housing to which the small DC motor is removably fixed to one side. A transmission mechanism unit characterized in that a synthetic resin cover is fitted with a circular opening in the center that surrounds a boss-like protrusion that constitutes the part, leaving a slight annular gap. 8. The transmission mechanism unit for rotating equipment according to claim 7, wherein when the transmission mechanism unit is fixed to the small rotating equipment, the synthetic resin cover becomes a partition wall interposed between the two. A power transmission unit featuring: 9. The transmission mechanism unit according to claim 1, wherein the rotating device is a rotary pump such as a gear pump.