JPH10201169A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor which can increase inertial moment while downsizing itself, and enables the easy acquisition of motors different in interial moment even if they are the motors on the same standard. SOLUTION: A flywheel 24 is attached integrally to the rotary shaft 11 of a motor where the armature 2 is made in small diameter. For example, a gear 21 is coupled by serration with the rotary shaft 11, and this gear is provided with a noncircular boss part 23 at its one part, and the flywheel 24 whose shaft hole 25 is nonlinear is engaged with the boss part 23, whereby the flywheel 24 is united around the rotary shaft 11. The flywheel 24 is rotated together with the rotation of the rotary shaft 11, the inertial moment is increased by the weight of the flywheel, and the load large in load ripple can be driven stably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly, to a motor whose size is reduced and whose moment of inertia is increased.

[0002]

2. Description of the Related Art An electric motor which is driven to rotate by power supply, in particular, a motor which uses a direct current as a power source, has a rotating shaft rotatably supported in a casing, and an armature is integrally provided on the rotating shaft. A magnet is arranged around the amateur. Then, by passing a current through the armature coil through a rectifying terminal provided on the casing and a rectifying electrode provided on the rotating shaft to sequentially change the magnetization state, an attractive force and a repulsive force between the magnet and the magnet. The configuration is such that the amateur and the rotating shaft are rotated. In such a motor, the torque (rotational moment) generated on the rotating shaft depends on the strength of the magnetic force generated in the armature. Therefore, it is necessary to increase the diameter of the armature in order to increase the torque.

[0003]

In such a motor, if an armature is designed according to the torque of a load to be driven by the motor, the motor is applied to a load having a torque larger than a design value. There is a problem that you can not. For this reason, conventionally, it is necessary to design and manufacture various types of motors having different torques in response to the diversification of the load torque, which makes the work and management troublesome. Further, in a motor for driving a load in which the torque fluctuates, it is preferable to increase the moment of inertia generated in the rotating shaft of the motor in order to drive the load stably. That is, it is necessary to increase the diameter. For this reason, in a conventional motor for driving a load with particularly large load fluctuation,
There is a problem that it is difficult to reduce the diameter of the amateur, which is an obstacle to downsizing the motor. Conventionally, a motor having a large moment of inertia to cope with a load change and a motor having a small load change and a small moment of inertia are manufactured as completely different standards, so that the design and manufacturing are complicated. There is a problem.

An object of the present invention is to provide a motor that can increase the moment of inertia while reducing the size of the motor and can easily obtain a motor having the same standard but a different moment of inertia. .

[0005]

A motor according to the present invention is characterized in that a flywheel is integrally provided on a rotating shaft thereof. For example, a non-circular portion provided integrally with the rotating shaft of the motor, and a flywheel fitted to the non-circular portion and integrated with the rotating shaft at least in a direction around the axis are provided. In this case, the motor has a gear that is serrated to the rotating shaft of the motor and that can be attached to and detached from the rotating shaft, a non-circular boss is provided in a part of the gear in the axial direction, and the flywheel has a radial dimension, A non-circular boss in which a flywheel of a different standard such as weight is detachably attached to the boss portion and is integrally attached to the rotating shaft of the motor, and is fitted to the boss to rotate in a direction around the axis of the rotating shaft. And an integrated flywheel. Further, the motor of the present invention is applied to a grease pump including a grease tank for storing grease and a pump mechanism for pumping the grease toward an external device, wherein the pump mechanism pumps grease in a grease passage. And a crank mechanism for reciprocating the piston, and are configured as a motor for driving the crank mechanism.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external view of a motor M according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of an internal structure taken along the line AA, and FIG. This embodiment shows an example in which a reduction gear train for reducing the rotation output of the motor M is integrally formed. In these figures, a casing 1 has a cylindrical motor portion 2 having one end opened and a box-shaped gear portion 3 having another end opened by resin molding. And the motor unit 2
The end wall 4 is attached to one end of the gear unit 3 by a screw (not shown), and the lid 5 is attached to the other end of the gear unit 3 by a screw (not shown). The inside is sealed. Inside the casing 1, a motor unit 2 and a gear unit 3 are provided.
The rotary shaft 11 is rotatably supported across the motor unit 2 and the gear unit 3 through the partition wall 6. One end of the rotating shaft 11 is axially supported by a bearing 4a provided on the end wall 4, and a bearing 6a provided on the partition 6 at the other end.
The shaft is supported by Further, both sides of the gear portion 3 of the casing 1 are formed to be thick, and the motor is attached to a grease pump or the like to be described later at a plurality of places on the thick portion 1a or the outer surface of the lid 5. Mounting screw hole 5a
Is provided.

The rotary shaft 11 is provided integrally with a core having a radial cross section perpendicular to the shaft, and a coil is wound around the core to form an armature 12. A plurality of magnets 1 each having a cylindrical shape along the inner surface of the motor portion 2 of the casing 1 are provided at an outer peripheral position of the armature 12.
3 are arranged. A plurality of rectifying electrodes 14 arranged in the circumferential direction are arranged on the rotating shaft 11 near the end wall 4.
Are insulated and supported. This rectifying electrode 14 is electrically connected to the coil of the amateur 13. Each of the rectifying electrodes 14 is located at a position sandwiching the rectifying electrode 14 from the outside in the radial direction.
Rectifying brush 15 which is slidably in contact with the outer peripheral surface of the brush 4 and electrically connected thereto
Are supported by the end wall 4, and these rectifying brushes 15
Is extended to the outer surface of the end wall, and is configured as an electrical connector 16 to which a cord 17 is connected.

A first gear 2 formed in a cap shape is provided at the other end of the rotating shaft 11 extended to the gear portion 3.
1 is fitted. Serrations are formed in the shaft holes of the first gear 21, and are fitted to serrations 11 a provided at the other end of the rotary shaft 11 to be integrated in the direction around the axis. In addition, a projection 22 formed in a spherical shape is provided at the center position of the front end surface of the first gear 21, and this projection 22 is in contact with the inner surface of the lid 5 to support the front end surface of the first gear 21. doing. Further, a boss 23 having a hexagonal cross section perpendicular to the axis is integrally formed at the base end of the first gear 21. A flywheel 24 having a short columnar shape and a hexagonal shape corresponding to the boss portion and having a part in the axial direction of the shaft hole 25 is fitted into the boss portion 23. The gear 21 is integrated with the gear 21 in the direction around the axis. The flywheel 24 is formed of a metal having an arbitrary specific gravity as needed, and its axial length and diameter are appropriately designed.

Further, the gear portion 3 has bearings 7a, 7b and 8 provided with an idler shaft 25 and an output rotary shaft 26 provided on the casing 1 and the lid 5, respectively, in parallel with the rotary shaft 11.
a, 8b. An idle gear 29 in which a second gear 27 and a third gear 28 are integrally formed is supported on the idle shaft 25, and the second gear 27 is the first gear 21.
To be engaged. The output rotation shaft 26 has a fourth gear 30.
Are rotatably supported and mesh with the third gear 28. And
One end of the output rotation shaft 26 projects from the gear portion 3 through the lid 5 to the outside of the casing 1, and is configured as an output rotation shaft for outputting the rotation force of the motor M.

FIG. 4 is an external view of an embodiment in which the motor of the above embodiment is applied to a grease pump GP of an automobile, and FIG. 5 is a cross-sectional view of the internal configuration thereof. The grease pump GP
It mainly supplies grease to the bearings of large vehicles such as trucks and buses, and the grease contained in the grease tank is driven periodically by a pump mechanism driven by a motor by periodically driving the bearings, not shown. To the pressure. As shown in the figure, a grease tank 41 for storing grease G is formed in a cylindrical container shape, and an opening 42 is provided on a lower surface thereof, and a pump mechanism 43 is integrally formed facing the opening 42. The pump mechanism 43 has a main body portion 44 having a grease passage 45 connected to the opening 42 of the grease tank 41 therein. In the main body portion 44, a piston 46 is provided facing the grease passage 45. The grease G flowing to the grease passage 45 by the reciprocating movement of the piston 46 is fed to the grease supply port 47 by pressure.

The outer end of the piston 46 is exposed in a concave portion 48 provided on the outer surface of the main body portion 44, and is reciprocated by a crank portion 49 formed in the concave portion 48. The motor M is attached to the main body portion 44 at a position corresponding to the crank portion 49, and the output rotation shaft 26 is protruded into the concave portion 48 through an opening 50 provided in the main body portion 44. ing. This motor M
Is fastened to the main body 44 by a screw (not shown) screwed into the mounting screw hole 5a of the casing 1. An eccentric disk 51 is attached to the output rotary shaft 26. A pin 52 protruding from a part of the circumference of the eccentric disk 51 and the piston 4
6 is connected to an outer end portion of the eccentric disk 51 by a swingable crank 53. The crank 53 is swung by the rotation of the eccentric disk 51, and the piston 46 is reciprocated.

In the grease pump GP having this configuration, when the motor M is supplied with power and is driven to rotate, the rotational force of the rotating shaft 11 is reduced by the reduction gear train in the gear portion 3 and becomes the rotation of the output rotating shaft 26. Is output. This output rotary shaft 2
6 rotates the eccentric disk 51 and the crank 53
Is swung, and the piston 46 is reciprocated. When the piston 46 is advanced in the distal direction, the grease G remaining in the grease passage 45 is supplied to the grease supply port 47.
And pump it out to the unillustrated vehicle bearing.
When the piston 46 is retracted, the grease G in the grease tank 41 is drawn out to the grease passage 45,
Be prepared for the next pumping.

As described above, the piston 46 is reciprocated with the rotation of the motor M. When the piston 46 moves forward, the load force increases because the grease in the grease passage is pumped. The force is reduced. FIG.
Is a diagram showing the change in the load, and it can be seen that the load is periodically changed in synchronization with the rotation speed of the motor. Therefore, in order to perform stable driving, it is necessary to set the driving force of the motor, that is, the torque, to a value that satisfies the maximum load of the fluctuating load. Conventionally, the armature is designed to have a large diameter and the rotational speed is reduced. It keeps the rotational moment in check. On the other hand, in the above-described motor of the present invention, the flywheel 24 is integrally attached to the rotating shaft 11 of the motor instead of increasing the diameter of the armature 12. When the flywheel 24 is provided, when the flywheel 24 is integrally rotated with the rotation of the rotating shaft 11, the moment of inertia is increased, and the moment of inertia is increased as the rotational moment, that is, the torque of the piston 4.
6 is a force for driving. Accordingly, stable driving can be performed irrespective of the load fluctuation occurring in the piston 46.

Therefore, a necessary moment of inertia can be obtained even though the diameter of the armature 12 of the motor M is reduced, so that a stable supply of grease can be achieved. Further, even with a plurality of motors having the same standard for the armatures 12, different arbitrary moments of inertia can be obtained by attaching the flywheels 24 having different standards, so that the motors can be applied to grease pumps having different loads. Therefore, it is possible to easily deal with the problem without changing the design of the motor itself. In particular, when attaching / detaching the flywheel, in the above-described embodiment, after removing the lid 5 of the casing 1 and removing the first gear 21 connected to the rotating shaft 11 by serration from the rotating shaft 11, the flywheel 24 Is the boss 2 of the first gear 21
3, it can be detached integrally therewith, which facilitates the exchange of flywheels of different standards. In the case of a motor used for a low load, the weight of the motor can be reduced by removing the flywheel.

Here, in the motor of the embodiment, the flywheel 24 attached to the rotating shaft 11 is connected to the armature 12
, The flywheel 24
Even if the dynamic balance caused by the rotation of the rotating shaft 11 is not zero, the vibration and the like due to the eccentric rotation of the rotating shaft 11 can be minimized. Further, in the above-described embodiment, an example is shown in which the motor of the present invention is configured as a motor for a grease pump. However, it is needless to say that the motor of the present invention can be applied as a motor for driving other loads. By doing so, the motor of the present invention can be used more effectively.

[0016]

As described above, according to the present invention, since the flywheel is integrally provided on the rotating shaft of the motor, the flywheel is rotated along with the rotation of the rotating shaft.
Even when the diameter of the amateur is reduced, a large moment of inertia can be obtained, and in particular, it is possible to drive a load having a large load fluctuation such as a grease pump having a piston-structured pump mechanism in a stable state. Further, even with the same amateur configuration, it is possible to easily configure motors having different output characteristics by attaching flywheels having different standards.

[Brief description of the drawings]

FIG. 1 is an external view of a motor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a partially exploded perspective view of a main part.

FIG. 4 is an external view of an embodiment in which the motor is applied to a grease pump.

FIG. 5 is a longitudinal sectional view of FIG.

FIG. 6 is a diagram showing load fluctuation of a grease pump.

[Explanation of symbols]

 M motor GP grease pump G grease 1 casing 2 motor unit 3 gear unit 4 end wall 5 lid 11 rotation shaft 12 amateur 13 magnet 14 rectifying electrode 21 first gear 23 boss unit 24 flywheel 26 output rotation shaft 41 grease tank 43 pump mechanism 44 Body 46 Piston 53 Crank

Claims (4)

[Claims] 1. A motor, wherein a flywheel is integrally provided on a rotating shaft of the motor. 2. A motor comprising: a non-circular portion provided integrally with a rotating shaft of a motor; and a flywheel fitted to the non-circular portion and integrated with the rotating shaft at least in a direction around the axis. Features motor. 3. A gear that is serrated and coupled to the rotating shaft of the motor and that is detachable from the rotating shaft. A non-circular boss is provided in a part of the gear in the axial direction, and the flywheel has a diameter of 3. The motor according to claim 2, wherein flywheels having different specifications such as size and weight are detachable from the boss. 4. A grease pump comprising a grease tank for storing grease and a pump mechanism for pumping the grease toward an external device, wherein the pump mechanism is for pumping grease in a grease passage. 4. The motor according to claim 1, further comprising a piston, and a crank mechanism for reciprocating the piston, and configured as a motor for driving the crank mechanism.