JPH0116097B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a drive device for rotating equipment using a permanent magnet electric motor as a drive source.

Configuration of conventional example and its problems A permanent magnet type electric motor is used as the drive source, and a conical cone is attached to the output shaft of the permanent magnet type electric motor that draws out low rotation and required torque through a gear reduction mechanism. In citrus juicers and the like that squeeze oranges by pressing citrus fruits against each other, when the electric motor is not driven, the output shaft, or in this case, the cone, is exposed and can be easily rotated by hand. At this time, the rotor of the electric motor is rotated at high speed by increasing the speed through the gear. Therefore, since the electric motor is driven from the outside, it becomes a generator. Therefore, touching the plug at this time would result in an electric shock, which was extremely dangerous.

Purpose of the Invention The present invention provides a mechanical blocking means to the speed reduction mechanism so that the electric motor cannot be driven by an external driving force,
The present invention provides a highly safe driving device for rotating equipment.

Structure of the Invention The present invention includes a permanent magnet electric motor that drives an output shaft through a reduction gear train, and an intermediate gear constituting the reduction gear train and a driven gear that meshes with the intermediate gear are helical gears. The intermediate gear is rotatably supported with a thrust clearance in the axial direction, and a clutch part that engages in one direction is provided at the boss end extending in the axial direction of the intermediate gear, and this is formed in the bearing part. These clutch parts are installed opposite to the clutch part, and when the intermediate gear is driven by the electric motor, the clutch parts maintain the thrust gap and transmit the driving force to the output shaft, and when the output shaft is driven with the power supply disconnected, they mesh to rotate. For example, the cone can be used in a citrus juicer without any problems during normal use, and even if the cone is manually rotated when the power is disconnected, the cone cannot be rotated.

DESCRIPTION OF EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. The figure shows a general permanent magnet electric motor.
is a permanent magnet rotor, a pinion 3 is fixed to a shaft 2, and the shaft 2 is rotatably supported on a bracket (not shown). 4 is the iron core, 5 is the drive coil,
It is attached to iron core 4. The permanent magnet rotor 1 disposed on the magnetic pole portion 6 of the iron core 4 is rotationally driven by the drive coil 5 . The rotation direction of this electric motor 7 is generally indeterminate, but the electric motor 7 shown in FIG. 2 has a one-way rotation control mechanism, and the electric motor 7' shown in FIGS. 3 and 4 does not have a rotation control mechanism. It is designed to be rotatable in either direction.

In FIG. 2, 8 is the main body, and 9 is a board attached to the main body 8. An intermediate gear 10 meshes with the pinion 3, is integrated with the gear 11, and loosely fits onto a shaft 14 inserted between bearings 12 and 13 provided on the main body 8 and the base plate 9. The end of the boss 15 extending to the intermediate gear 10 is in sliding contact with the bearing 13, while the end of the boss 16 extending to the gear 11 and the end of the bearing 12 are provided with a clutch that meshes only in one direction. Sections 17 and 18 are formed and are arranged with a thrust gap of dimension A in the axial direction. The gear 11 is a helical gear as shown in the figure. Therefore, the driven gear 19 that meshes with the gear 11 is also a helical gear, is fixed to the output shaft 20, and is connected to the main body 8 and the substrate 9.
It is rotatably supported by bearing parts 21 and 22, and is held so as not to move in the thrust direction.
23 is a cone attached to the output shaft 20, and squeezes the orange by pressing an orange or the like against the rotationally driven cone 23.
It makes up citrus juicer.

The aforementioned gear 11 is twisted to the left, and the clutch portions 17 and 18 formed at the end of the boss are engaged when the intermediate gear 10 rotates in the direction of the arrow to prevent rotation of the gear 11. The settings are related to each other.

Next, the operation will be explained.

It is assumed that the electric motor 7 is rotationally controlled in the direction of the arrow in the figure. Intermediate gear 10 meshing with pinion 3
The gear 11 integrally formed therewith undergoes the rotation indicated by the arrow. At this time, by driving the driven gear 19 supported in the axial direction, the gear 11 receives a thrust force in the direction B in the figure, and therefore the clutch portion 17,
18 maintains the thrust gap A so that the cone 23 can continue to rotate without interfering with the rotation of the reduction gear train.

Next, when the outlet is disconnected from the power supply and the cone 23 is given rotation in the direction in which the electric motor 7 can rotate (indicated by the dashed arrow in the figure), the driven gear 19 becomes the drive side, so the gear 11 is thrust in the C direction in the figure. Under the force, the clutch part 1 easily passes through the thrust gap A.
7 and 18 mesh. Due to this, the gear 11
is prevented from rotating, and the cone 23 cannot be continued to be rotated by hand. Since the electric motor 7 is not rotated by such an external force, it cannot function as a generator.

Next, FIGS. 3 and 4 show an embodiment in which the direction of rotation of the electric motor 7' is not controlled, that is, the direction of rotation is arbitrary. Parts common to those in FIG. 2 are given the same numbers and explanations are also given. Omitted. The difference from Figure 2 is that
A spring 24 made of a compression coil that presses the intermediate gear 10 downward is connected to the bearing part 1 of the gear 11 and the main body 8.
Clutch parts 25 and 26 are formed on opposite end surfaces of the post 16 extending from the intermediate gear 10 and the bearing part 13 provided on the base plate 9.

When the pinion 3 is driven in the direction of the arrow in FIG.
and rotates without meshing while receiving the biasing force of the spring 24. The clearance A′ in the thrust direction is the clutch portion 24,
Rotation is possible because the setting is made taking into account the amount of separation of 25. Also, if the cone 23 is turned, the second
As shown in the figure, clutch portions 17 and 18 engage against spring 24 to prevent rotation. Further, FIG. 4 shows a case where the pinion 3 is driven by rotation in the opposite direction to that in FIG. Before that, the clutch parts 25 and 26 are engaged and cannot rotate. Further, when the cone 23 is rotated in the direction of the dashed arrow, a thrust E acts in addition to the biasing force of the spring 24, and the clutch portions 25 and 26 are engaged to prevent rotation. That is, in the case of the rotation direction shown in FIG. 4, rotation is not possible from either the motor 7' side or the cone 23 side. The example shown in Figures 3 and 4 is
Since this is a case where a rotation control mechanism for the electric motor is not provided, only one driving direction of the electric motor is allowed, and rotation from the cone side is prevented in either direction. Further, it is preferable that the spring 24 made of a compression coil has a smaller biasing force. This is because, in FIG. 4, when driving the motor 7', it is intended to prevent the motor from rotating. By increasing the number of teeth in the meshing parts of the clutch parts 25 and 26, the clutch part 2 can be moved faster than the displacement of the last force D.
If 5 and 26 are made to mesh with each other, the spring 24 becomes unnecessary.

Furthermore, in FIGS. 3 and 4, the spring 24 is eliminated, the thrust clearance A' is further increased, the intermediate gear 10 is changed from a spur gear to a hasp gear with the same left-hand helix as the gear 11, and the pinion 3 is also changed from the gear 10. If the helical gear corresponding to the above is constructed, as shown in FIG. 3, when the electric motor 7' is driven, it will receive thrust in the C direction, and the sliding force of the clutch parts 25 and 26 will be reduced, although B>C from the transmission torque ratio. It is possible. In FIG. 4, if the number of teeth of the clutch parts 25 and 26 is reduced, the gear 1
Since D>E with respect to the thrust force E that 0 receives, the intermediate gear 10 floats up and the upper clutch part 1
7 and 18 make sliding contact, but the rotation is transmitted to the cone 23, and conversely, rotation from the cone side becomes E>D, and the clutch parts 25 and 26 mesh to prevent rotation. In this case, the rotation from the electric motor 7' side is transmitted to the cone 23, and the rotational external force from the cone 23 side is transmitted to the electric motor 7'.
This results in a configuration that cannot be transmitted.

Effects of the Invention As described above, the present invention enables rotation of the output shaft by transmitting the drive from the electric motor side through the action of the clutch portion, and makes it possible to disable rotation from the output shaft side with a simple configuration. It is.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a general permanent magnet type electric motor, Fig. 2 is a sectional view showing an apparatus according to an embodiment of the present invention, and Figs. 3 and 4 are sectional views showing other embodiments of the invention. It is a diagram. 7, 7'...Electric motor, 10...Intermediate gear, 11
... Gear, 12, 13 ... Bearing part, 14 ... Shaft,
17, 18...clutch portion, 19...driven gear,
20...Output shaft.

Claims (1)

[Scope of Claims] 1. A permanent magnet type electric motor that drives an output shaft via a reduction gear train, the gears constituting the reduction gear train and the driven gears that mesh with the gears are helical gears, and the intermediate gears are helical gears. The gear is rotatably supported with a thrust gap in the axial direction, and a clutch part that meshes in one direction is provided on the boss end extending in the axial direction of the intermediate gear, and this is formed in the bearing part. These clutch parts maintain the thrust gap and transmit the driving force to the output shaft when the intermediate gear is driven by the electric motor, and mesh to prevent rotation when the output shaft is driven with the power supply disconnected. A driving device for rotating equipment configured as follows. 2 The intermediate gear has a clutch part on the other end that engages in the opposite direction to one clutch part of the intermediate gear, so that the drive from the motor side is transmitted only in one direction, and the drive from the output shaft side is transmitted from either the left or right direction. 2. The drive device for a rotating device according to claim 1, wherein the intermediate gear receives some thrust force from the driven gear and is prevented from rotating by engagement of a clutch portion.