JP2007074767A - Motor drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive motor drive in which a motor can be driven against a load of a driven body subjected to ascending driving only by the energization of forward/reverse driving to the motor, and a brake force can be applied against the gravitational falling action of the driven body in the case of descending driving. <P>SOLUTION: The motor drive comprises a motor 2 having an output shaft 7 rotationally driven in forward/reverse directions through energization, a unit 4 arranged at one end of the output shaft and not generating a friction load when the output shaft is driven forward but generating a friction load for applying a brake force against the gravitational falling action of a driven body when the output shaft is driven reversely, and a reduction gear 3 connected with the other end of the output shaft 7 becoming the output side and having big detent torque. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motor drive device, and in particular, a motor drive configured to perform a predetermined drive only by energization of forward and reverse drive of the motor without using a control circuit that performs drive control according to the drive load of the motor. Relates to the device.

The applicant of the present application holds a table storage shelf, which is a driven body, in a suspended state using a belt and a pulley, and a belt winding mechanism including a belt pulley for winding and unwinding the belt. By using it, an elevating device that drives the tableware storage shelf up and down between a lower tableware loading / unloading position and an upper tableware storage / drying position is proposed. Specifically, the belt pulley is rotated in the forward and reverse direction by energizing the motor so as to drive the belt take-up mechanism forward and backward, and the table cabinet is moved up and down between the upper position and the lower position. It is configured to drive. In particular, the use of a belt realizes an elevating device with excellent noise reduction effect that reduces noise during driving. (Patent Document 1)
Thus, in order to drive the tableware storage shelf which is a driven body upward, the motor may be driven against the load. On the other hand, since the action of dropping the tableware's own shelf is applied when the table is driven downward, if the motor is simply driven in the reverse direction, it will fall at a rapid speed.

Therefore, conventionally, the control of the descent braking force for holding the cupboard position when the motor is stopped using an electromagnetic brake is electrically performed using an electronic circuit so that the cupboard shelf does not drop rapidly. I have to.
JP 2001-199692 A

  However, as described above, in order to perform drive control that does not rapidly lower the tableware storage shelf that is the driven body, it is necessary to perform drive control of the electric brake in accordance with detection of rotation of the motor. For this reason, there is a problem that the drive circuit configuration associated with the motor becomes complicated and must be expensive.

  Therefore, the present invention has been made in view of the above problems, and without using a control circuit that performs drive control according to the drive load of the motor, only energization for forward and reverse drive of the motor, An object of the present invention is to provide a motor drive device that can be driven against a load of a driven body that is driven to rise, and that can provide a braking force against a dropping action due to its own weight when driven downward. It is said.

  In addition, an object of the present invention is to provide a motor drive device that can hold a driven body at a stop position when energization of the motor is stopped.

  In order to solve the above-described problems and achieve the object, according to the present invention, a motor having an output shaft that is rotationally driven in forward and reverse directions by energization, and one end of the output shaft, and the output A friction load generating means for generating a friction load that does not generate a friction load when the shaft is driven in the forward direction and that applies a braking force to the driven body when the output shaft is driven in the reverse direction; And a speed reducer having a large detent torque and being connected to the other end of the output shaft.

  In addition, when the motor is de-energized, the friction load is set to a friction value to be held at the stop position against the weight falling action of the driven body by applying the detent torque of the reduction gear. It is characterized by that.

  The motor, the friction load generating means, and the speed reducer may be integrated into an integrated device.

  The driven body is suspended using a belt and a pulley, and is driven up and down between an upper position and a lower position by belt winding means including a belt pulley that winds and unwinds the belt. In addition, the belt pulley is driven using the integrated device.

  The driven body is driven up and down between an upper position and a lower position by a screw nut means composed of a feed screw and a feed nut, and the feed nut is driven using the integrated device. It is characterized by doing.

  The speed reducer includes a worm formed at the other end of the output shaft, and a worm wheel that is pivotally supported so as to mesh with the worm, and the friction load generating means is configured to A one-way clutch incorporating a plurality of wedge-shaped rollers acting on the outer peripheral surface of the one end, a rotating disk fixed to the outer race side of the one-way clutch, and a pair of brakes slidably contacting the disk front and back surfaces of the rotating disk It is characterized by comprising a pad and a pressing member that constantly presses the pair of brake pads against the front and back surfaces of the disk.

  The friction load generating means is fixed to the one end of the output shaft via an elastic member.

  The friction load generating means is fixed to the one end of the output shaft via an alignment member.

  According to the present invention, the motor can be driven against the load of the driven body that is driven to rise only by energization of the forward / reverse driving of the motor, and the braking force against the dropping action due to the weight of the driven body when driven downward. It is possible to provide a motor drive device that can be manufactured at low cost.

  A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

  Here, in the following embodiments, for example, a motor drive device designed exclusively for a lifting device provided with a table storage shelf that is driven up and down will be mainly described. However, various devices other than the device configured as described above are described. Needless to say, it can be applied as an application.

  First, FIG. 1 is a front view in which a main part of a motor drive device 1 according to an embodiment of the present invention is cut away. According to this figure, the motor drive device 1 is reduced in size and cost by the motor 2, the speed reducer 3, and the friction load generator 4 being linearly integrated with the common output shaft 7. I am trying. However, the configuration is not limited to such an integral configuration, and besides this, the motor 1, the speed reduction device 3, and the friction load generation device 4 are individually configured and connected via a joint (not shown). It may be configured to be more compact.

  In FIG. 1, the motor 1 can be a DC motor of a predetermined rating or an AC reversible motor that is driven to rotate in the forward and reverse directions by energization, but other types of motors capable of rotating in the forward and reverse directions can also be used. The motor 1 is connected to a motor driver circuit 5 that obtains electric power from a commercial power source and is connected to a two-contact switch 63 as shown in the figure. The operation part of the two-contact switch 63 stands by at a neutral position when the motor is not energized. When the operation part is tilted upward during use, the motor is driven in the forward direction, and when it is tilted downward, the motor is driven in the reverse direction. The motor driver circuit 5 is connected to drive. When a direct current motor is used, the motor driver circuit 5 has a built-in direct current power circuit, and is configured to change the energization polarity from the direct current power circuit in accordance with the operation of the two-contact switch 63 described above. Further, when an AC reversible motor is used, it can be configured to drive in the forward and reverse directions by changing the phase in accordance with the operation of the two-contact switch 63.

  The case where the motor 2 is a direct current motor will be described below. The motor 2 has a cylindrical part made of, for example, aluminum die cast, which is a non-magnetic material, as a base 6, and a pair of left and right radials built in the base 6 An output shaft 7 is rotatably supported by ball bearings 8 and 8. A coil 10 serving as a rotor is fixed to the output shaft 7, and a rotating magnetic field is generated in the coil 10 by applying current from the motor driver circuit 5 to the coil 10 via a power supply brush (not shown). The Since the permanent magnet 9 having a different polarity, which is a stator, is fixed so as to be along the inner peripheral surface of the base portion 6 so as to surround the outer peripheral surface of the coil 10, a predetermined value is obtained by a magnetic attraction between the permanent magnet and the coil. The output shaft 7 is rotationally driven in the direction.

  The right end of the output shaft 7 protrudes from the radial ball bearing 8 toward the outside of the base 6 and is fixed to the friction load generating device 4 serving as a friction load generating means. The friction load generating device 4 includes a yoke 18 and a fixed disk 16 that are fixed to the base 6 via the rubber bush 29 and have substantially the same outer dimensions as the base 6. The specific configuration will be described later. To do.

  On the other hand, a reduction gear 3 having a large detent torque is fixed to the other end of the output shaft 7 on the motor output side as shown in the figure. The speed reduction device 3 is configured as a worm gear speed reduction device that includes a worm 11 and a worm wheel 12 that is pivotally supported so as to mesh with the worm 11 so that a large detent torque can be obtained when the motor is not energized. Can be generated. In addition to such a worm gear reduction device, for example, a spur gear reduction device having a gear reduction ratio of 30: 1 or more, a hypoid gear reduction device, a planetary gear reduction device, or the like may be used, and a reduction device is appropriately selected.

  A worm 11 is coupled to the other end of the output shaft 7 to reduce the cost. A worm wheel 12 that meshes perpendicularly to the worm 11 is integrally formed with a hollow body 30 that is rotatably supported by a pair of bearings 13 held by a base portion 14. A key 31 is formed on a part of the inner peripheral surface. Similarly to the motor base 6, the base 14 is made of aluminum die cast, and is fixed to the motor base 6 with screws, and has a plurality of screw holes 14a for attachment.

  As described above, in the motor driving device 1, the motor 2, the speed reduction device 3, and the friction load generating device 4 are linearly integrated with respect to the common output shaft 7, so that the plurality of screw holes 14a in the base portion 14 are integrated. The whole can be fixed by screwing the screws. Further, when the whole is fixed, the driving force can be transmitted by infiltrating the driven shaft body provided with the groove portion matching the key 31 into the inner peripheral surface of the hollow body 30.

  Next, FIG. 2 is a three-dimensional exploded view of the friction load generator 4 of FIG. In particular, the friction load generating device 4 is set so that the friction load is set to a friction value that holds a driven body, which will be described later, at a stop position by applying a large detent torque that the speed reduction device 3 has when not energized. . It is determined from the mutual dimensional relationship between the parts as described below, or is adjustable. In this figure, the same reference numerals are given to the components or parts that have already been described, and the description thereof is omitted. This friction load generator 4 generates a friction load when the output shaft 7 of the motor 2 is driven in the positive direction. Although it does not generate | occur | produce at all, it is comprised so that the friction load which gives a braking | braking (braking) force may be generated when the output shaft 7 is driven in the reverse direction.

  The yoke 18 has, for example, a through hole 18b through which the output shaft 7 penetrates at the center. The yoke 18 is further provided with a mounting hole portion 18c into which a short bolt 28 (only two are shown in the drawing) is inserted into the mounting hole portion 6a on the base portion 6 side through the rubber bush 29. Drilled at angular intervals. Further, the yoke 18 is formed with holes 18d serving as seating surfaces for the three compression coil springs 25 at an angular interval of 120 degrees.

  The yoke 18 has screw holes 18a for fixing the above-described fixing disk 16 by screwing with the long bolts 15 through three spacers 17 (only two are shown in the figure) at an angular interval of 120 degrees. And is formed outside the hole 18d. On the three compression coil springs 25 on the yoke 18, a brake actuator disk 24 having a through hole 24a having a large diameter for passing the output shaft 7 in the center is inserted.

  On the brake actuator disk 24, a second brake pad 23 having a through hole having a large diameter as shown in the center is fixed to the rotating disk 21 by bonding or the like. The rotating disk 21 is integrally formed with a flange portion 21 f having a bottom surface that contacts the second brake pad 23. The first brake pad 19 prepared from the same brake material as that of the second brake pad 23 is similarly fixed to the upper surface of the flange portion 21f of the rotary disk 21 by adhesion or the like. In addition, the one-way clutch 20 is built into the through hole 21 a of the rotating disk 21 by press-fitting or a set screw 22 and is inserted into the output shaft 7.

  Finally, the above-described fixed disk 16 is fixed to the base 6 of the motor by using the long bolts 15 with respect to the yoke 18 so that the state shown in FIG.

  By assembling in this way, it becomes like the central sectional view of the friction load generating device 4 shown in FIG. Further, the one-way clutch 20 is inserted into the output shaft 7 as shown in FIG. In this figure, the same reference numerals are given to the components or parts already described, and the description is omitted. A plurality of wedge rollers 20a acting on the outer peripheral surface of the output shaft 7 are incorporated in the inner race and the outer race 20b is provided. The rotating disk 21 is press-fitted or screwed into the through hole 21a. As described above, the plurality of wedge rollers 20a of the one-way clutch 20 slide as they are when the output shaft 7 rotates in the direction of the solid arrow in the drawing.

  However, when the output shaft 7 rotates in the direction of the broken line arrow in the figure, the wedge-shaped effect of the wedge-shaped roller 20a is held in a locked state between the outer peripheral surface of the output shaft 7 and the outer race 20b. As a result, the output shaft 7 and the rotating disk 21 rotate integrally.

  At this time, the second brake pad 23 fixed on the flange portion 21f of the rotary disk 21 is urged upward in the figure by the three compression coil springs 25, so that the dynamic friction on the brake actuator disk 24 is achieved. It will be in sliding contact with force. Further, the first brake pad 19 is similarly slidably contacted on the bottom surface of the fixed disk 16. That is, when the rotating disk 21 is rotated in reverse by the dynamic frictional force of the first brake pad 19 and the second brake pad 23 fixed on the flange portion 21 f of the rotating disk 21, the braking force is applied.

  If the length of the spacer 17 is made variable and the degree of screwing of the long bolt 15 into the screw hole portion is adjusted, or the length of the coil spring 25 is adjusted, the degree of sliding contact can be adjusted, so that the braking force can be adjusted. Adjustment is possible. Furthermore, instead of the three compression coil springs 25 described above, a single compression coil spring whose diameter dimension substantially corresponds to the attachment base of the flange portion 21f of the rotary disk 21 may be used.

  Next, FIG. 4 is a three-dimensional exploded view showing a state in which a motor drive device 1 which is another embodiment of the present invention is provided in a belt lifting device. In the figure, the same reference numerals are given to the components or parts already described, and the description is omitted. First, a different configuration is that the friction load generating device 4 of FIGS. 1 to 3 is fixed to one end of the output shaft 7 via a rubber bush that is an elastic member. The device 4 is fixed to one end of the output shaft 7 via an alignment member 71. For this purpose, a groove 7k is formed in the output shaft 7, and a part of the alignment member 71 is inserted into the groove 7k. In addition, a shaft 70 having a groove 70k is set on the rotary disk 21 incorporating the one-way clutch 20 described above. Alternatively, as shown on the front side of the drawing, in the shaft body 70, a shape portion that enters into the groove portion 7 k of the output shaft 7 is formed, and the alignment member 71 that is a rubber ring-shaped stopper is covered after the entry. It may be configured.

  On the other hand, the base 6 of the motor has a plurality of screw holes 14a for attachment. The base 14 is fixed to the base 40 of the elevating device using screws 42, so that the key 31 is fixed. The driven shaft body 43 provided with the matching groove portion 45 can be brought into a state of entering the inner peripheral surface of the hollow body 30. As a result, it becomes possible to transmit the driving force to the driven shaft body 43 as the motor is energized.

  The driven shaft body 43 is rotatably supported by a bearing between the pair of base portions 40 and is wound around the belt 44 in the middle. The driven shaft body 43 is suspended using a pulley, and is configured as a belt pulley that winds and unwinds the belt 44 so that a table storage shelf that is driven up and down between an upper position and a lower position is provided. To drive. A detailed configuration for driving the belt pulley in this way is described in detail in Japanese Patent Application Laid-Open No. 2001-199692. Therefore, here is briefly described as follows.

  FIG. 5 is an external perspective view showing a main part in which the belt lifting device of FIG. 4 is attached to the tableware drying device. In this figure, the tableware storage shelf 51 which is a driven body is moved up and down in the directions of arrows D1 and D2 as shown in the figure, so that the tableware storage shelf 51 is moved in and out of the lowermost position and the tableware in the uppermost position. It is configured to be driven up and down between the storage and drying positions. The elevating shelf and the tableware drying apparatus main body 50 indicated by broken lines are provided, for example, in a cupboard space disposed above a sink of a kitchen dining set.

  The bottom surface of the main body 50 has an opening, and has a box shape having a size that covers the entire table except for the bottom of the tableware storage shelf 51 when the tableware storage shelf 51 is moved up and down as described above. On the other hand, guide plates 54 are respectively fixed to the left and right inner wall surfaces of the main body 50, and by fixing the slider members 55 guided by these guide plates 54 above the left and right outer wall portions of the tableware storage shelf 51, When driving up and down, the tableware storage shelf 51 can be guided in the front-rear and left-right directions without rattling.

  A movable pulley 47 is rotatably provided on the left and right parts of the top plate of the tableware storage shelf 51 using brackets, and a belt 44 is wound around the movable pulley 47, and the belt end 48 is illustrated. It is fixed to the base 40 shown by hatching inside. In the base portion 40 in the main body 50, idle pulleys 46 for guiding the belt 44 as shown in the drawing are rotatably provided at portions corresponding to the upper side of the movable pulley 47.

  Further, the driven shaft body 43 configured as a belt pulley that winds and unwinds the belt 44 by being rotatable with respect to the base portion 40 of the elevating device and being driven by the motor driving device 1 as described above. As described with reference to FIG.

  Next, FIG. 6 is a wiring diagram of the tableware drying apparatus of FIG. In this figure, the same reference numerals are given to the components or parts that have already been described, and the description is omitted. Inside the main body 50, the upper and lower parts that are turned on and off by the actuator 51a fixed to the side surface of the tableware storage shelf 51 are shown. Limit switches 61 and 62 are fixed. These switches are connected to the motor driver circuit 5 described above. When the operation portion of the two-contact switch 63 is tilted upward by the above wiring, the motor drive device 1 is driven in the forward direction, and the belt 44 is wound up. As a result, the tableware storage shelf 51 is driven upward in the direction of the arrow D1 until the upper limit switch 61 is turned on.

  On the other hand, when the operation portion of the two-contact switch 63 is tilted downward, the motor drive device 1 is driven in the reverse direction, and the belt 44 is rewound. As a result, the tableware is turned on until the lower limit switch 61 is turned on. The storage shelf 51 is driven down in the direction of arrow D2. In the middle of this operation, when the operation part of the two-contact switch 63 is released from the fingertip, the operation part returns to the neutral position and the energization to the motor is stopped. When such a motor is de-energized, the frictional force of the friction generator 4 is applied to the large detent torque of the speed reducer 3 to stop against the action of dropping the tableware storage shelf 51 as the driven body. Can be held in position. Referring to the drawings, FIG. 7 (a) is a central sectional view of the friction load generating device 4, and FIG. 7 (b) is an operation explanatory diagram of ascending drive shown together with a front view of the tableware drying apparatus.

  In this figure, components and components that have already been described are given the same reference numerals and description thereof is omitted. When the motor is driven in the forward direction, the output shaft 7 shown in FIG. 7A is driven in the direction of the arrow. At this time, the one-way clutch 20 runs idle. Further, as a result of the belt 44 being wound up by the driven shaft body 43, the tableware storage shelf 51 is driven upward in the direction of the arrow D1.

  FIG. 8A is a central sectional view of the friction load generating device 4, and FIG. 8B is an explanatory view of the descent driving operation shown together with the front view of the tableware drying device. In this figure, when the motor is driven in the reverse direction, the output shaft 7 shown in FIG. 8A is driven in the direction of the arrow. At this time, in the one-way clutch 20, the built-in wedge roller is engaged as described with reference to FIG. 3B so that the rotary disk 20 and the output shaft 7 rotate integrally.

  From this state, as the belt 44 is rewound by the driven shaft body 43, the tableware storage shelf 51 located at the uppermost position is lowered in the direction of the arrow D2. At this time, the tableware is stored by the sum of the braking force of the rotating disk 21 sandwiched so as to generate the frictional force by the first and second brake pads 19 and 23 and the detent force of the reduction gear 3 by the worm gear mechanism. The descent drive is performed while maintaining a balance with the weight drop load of the shelf 51.

  Further, by applying the frictional force of the friction generating device 4 to the large detent torque of the speed reducer 3 when not energized, the tableware storage shelf 51 can be held at a stop position that resists its own weight dropping action.

  Finally, FIG. 9 is an external perspective view showing a state in which a motor drive device 1 which is another embodiment of the present invention is provided integrally with a feed screw nut device composed of a feed screw and a feed nut. As shown in the figure, the driven body W is driven up and down in the directions of arrows D1 and D2 between an upper position and a lower position by a feed screw nut device 300 including a feed screw 350 and a feed nut 330. Further, the motor driving device 1 is integrally formed with a base portion in which a feed nut 330 is rotatably incorporated.

  Thus, by driving the feed nut, the driven body W can be driven up and down, and a large detent torque can be generated when the motor is de-energized, and the stop position can be maintained. It is most suitable for the tilt mechanism.

  In addition, according to the friction load generator 4 demonstrated above, although the 1st and 2nd brake pad was used, it is not limited to this, You may comprise so that only 1 sheet or 2 sheets or more may be provided. Needless to say.

It is the front view which fractured | ruptured and showed the principal part of the motor drive device 1 which is one Embodiment of this invention. It is a three-dimensional exploded view of the friction load generator 4 of FIG. (A) is center sectional drawing of the friction load generator 4 of FIG. (B) is a cross-sectional view showing a state in which the one-way clutch 20 is inserted into the output shaft 7. It is the three-dimensional exploded view which showed a mode that the motor drive device 1 which is another embodiment of this invention was provided in a belt raising / lowering apparatus. It is the external appearance perspective view which showed the principal part of the tableware drying apparatus provided with the belt raising / lowering apparatus of FIG. It is a wiring diagram of the tableware drying apparatus of FIG. (a) is center sectional drawing of the friction load generator 4, (b) is operation | movement explanatory drawing of the raising drive shown with the front view of the tableware drying apparatus. (a) is center sectional drawing of the friction load generator 4, (b) is operation | movement explanatory drawing of the descent drive shown with the front view of the tableware drying apparatus. It is the external appearance perspective view which showed a mode that it provided integrally with the feed screw nut apparatus comprised from a feed screw and a feed nut about the motor drive device 1 which is another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor drive device 2 Motor 3 Deceleration device 4 Friction load generation device 5 Motor driver circuit 6 Base 7 Output shaft 11 Worm 12 Worm wheel 14 Base 16 Fixed disk 18 Yoke 19 First brake pad 20 One-way clutch 21 Rotating disk 23 Second Brake pad 24 Brake actuator disc 29 Rubber bush

Claims (8)

A motor having an output shaft that is rotationally driven in forward and reverse directions by energization;
It is disposed at one end of the output shaft, and does not generate a friction load when the output shaft is driven in the forward direction, and generates a friction load that applies a braking force when the output shaft is driven in the reverse direction. Friction load generating means;
A motor drive device comprising: a reduction gear connected to the other end of the output shaft on the output side and having a large detent torque.   When the motor is de-energized, the friction load is set to a friction value to be held at the stop position against the weight drop action of the driven body by applying the detent torque of the reduction gear. The motor driving device according to claim 1.   The motor driving apparatus according to claim 1 or 2, wherein the motor, the friction load generating means, and the speed reducer are integrated into an integrated apparatus.   The driven body is suspended using a belt and a pulley, and is driven up and down between an upper position and a lower position by belt winding means including a belt pulley that winds and unwinds the belt. The motor driving device according to claim 3, wherein the belt pulley is driven using the integrated device.   The driven body is driven up and down between an upper position and a lower position by a screw nut means composed of a feed screw and a feed nut, and the feed nut is driven using the integrated device. The motor drive device according to claim 3. The speed reducer comprises a worm formed at the other end of the output shaft, and a worm wheel that is pivotally supported so as to mesh with the worm.
The friction load generating means includes a one-way clutch including a plurality of wedge-shaped rollers acting on the outer peripheral surface of the one end of the output shaft;
A rotating disk fixed to the outer race side of the one-way clutch;
A pair of brake pads in sliding contact with the front and back surfaces of the rotating disk;
A pressing member that constantly presses the pair of brake pads against the disk front and back surfaces;
The motor drive device according to claim 1, wherein the motor drive device is configured as follows.   The motor driving apparatus according to claim 6, wherein the friction load generating means is fixed to the one end of the output shaft via an elastic member.   The motor driving apparatus according to claim 6, wherein the friction load generating means is fixed to the one end of the output shaft via an alignment member.

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