JP5403405B2 - Motor with transmission - Google Patents

Description

  The present invention relates to a motor with a transmission that transmits rotation of a motor to a driven body via a transmission.

A motor with a transmission used in various industrial devices is used not only for driving performance such as driving torque and rotation speed, but also for driving a flap plate that prevents unauthorized exit of a parked vehicle in coin parking, for example. In many cases, high performance is also required for the braking force when an external force in the rotational direction is applied to the output shaft. As a method of applying a braking force to a motor with a transmission, there is a method of separately mounting an electromagnetic brake on the motor with a transmission. For example, Patent Document 1 discloses a method of mounting an electromagnetic brake on a motor.
JP 2005-88651 A

  However, the method of separately mounting the electromagnetic brake on the motor as in Patent Document 1 has a problem that the configuration is increased in size and the configuration is complicated, resulting in an increase in cost.

  In view of the above, the present invention is capable of generating a braking force when a force is applied to the output shaft in the rotational direction when the operation is stopped, and the transmission can be downsized and simplified. An object is to provide a motor with an attachment.

In order to achieve the above object, claim 1 of the present invention provides:
A motor with a transmission in which a motor and a transmission that transmits the rotation of a drive shaft of the motor are connected in series , the motor including a stator and a rotor including a drive shaft, and the drive shaft An input gear having an oblique tooth shape is attached so that thrust is applied in the direction of the transmission , the rotor is supported so as to be movable in the direction of the rotation axis, and the transmission is configured to rotate the drive shaft of the motor. A first transmission gear that has an oblique tooth shape opposite to the input gear attached to the drive shaft and meshes with the first transmission gear; and a transmission gear mechanism that transmits to the output shaft by at least one or more transmission gears; When power is transmitted to and from the first transmission gear, the input gear is configured to receive a force in the direction of the rotation axis, and the first transmission gear is supported with limited movement in the direction of the rotation axis. The machine motor has a first braking member and a second braking member. A braking mechanism consisting of a moving member, provided in the space portion of the motor, said braking mechanism, a braking force generated by said a first braking member and the second brake member is pressed, the first braking The member is on the transmission side of the rotor, and is fixed to a convex portion projecting from the center portion , and the second braking member is opposed to the bearing attached to the front wall of the housing and opposed to the first braking member. When the rotational force is applied to the output shaft of the transmission, the rotor is caused by the rotational shaft force generated when power is transmitted between the input gear and the first transmission gear. The first braking member and the second braking member are configured to be held in pressure contact with each other through the respective fixing members by performing thrust movement in the rotation axis direction.

  According to the above configuration, when a rotational force is applied to the output shaft of the transmission, the rotor is rotated by the rotational shaft force generated when power is transmitted between the input gear and the first transmission gear. The first braking member fixed to the rotor and the second braking member fixed to the stator can be brought into pressure contact with each other to generate a braking force. Furthermore, since it is not necessary to separately provide a device such as an electromagnetic brake, the configuration is reduced in size and simplified.

  Hereinafter, embodiments of the present invention will be described by way of examples. FIG. 1 is a cross-sectional view showing a configuration of a motor 1 with a transmission according to an embodiment. The transmission-equipped motor 1 includes a motor M formed of a cored motor and a reduction gear G as a transmission.

  First, the configuration of the motor M will be described. The motor case 10 of the motor M is formed by a cup-shaped housing 11 having an open rear end and a rear wall 13 fixed to the open end. The rear wall 13 is fixed by caulking (not shown) formed at a plurality of locations in the circumferential direction.

  A magnet 14 is installed on the inner peripheral wall of the housing 11, and the rotor R is supported through bearings 28 and 29 attached to the front wall 11 a of the housing 11 and the rear wall 13 fixed to the rear end, respectively. Yes. The rotor R is configured such that an iron core 19 is attached to the drive shaft 17, and a coil 20 is wound around the iron core 19, and a commutator 22 connected to the coil 20 is provided on the rear end side of the drive shaft 17. The drive shaft 17 passes through the front wall 11a of the housing 11, and the input gear 30 is fixed to the front end thereof. A brush 26 that is in sliding contact with the commutator 22 is provided on the rear wall 13. In addition, the motor case 10, the magnet 14, the bearing 28, and the bearing 29 are included in the stator S among the above-described configurations.

  Further, the motor case 10 is provided with a first braking member 42 and a second braking member 44 constituting a braking mechanism 40 which will be described in detail later. The first braking member 42 is provided at the left end of the iron core 19 of the rotor R. The second braking member 44 is fixed to the front wall 11 a (bearing 28) of the housing 11 so as to face the first braking member 42.

  With the above configuration, current is supplied to the coil 20 wound around the iron core 19 from the input terminal (not shown) via the brush 26 via the commutator 22, so that it is installed on the inner peripheral wall of the motor case 10. Rotational force is applied to the rotor R existing in the magnetic field formed by the magnet 14, and the rotor R can be rotated. Further, the rotor R is maintained in a state in which a slight gap is formed between a first braking member 42 and a second braking member 44 constituting a braking mechanism 40 described later by a magnetic attractive force of the magnet 14 with respect to the iron core 19. Thus, even when the rotor R is rotated by supplying the current as described above, the state in which the gap is formed is maintained.

  Next, the reduction gear G will be described. The reducer G has a spacer 36 attached to the front wall 11a of the housing 11 with bolts (not shown), and a bottomed cylindrical gear case 50 covering the spacer 36 with its open end covered on the spacer 36. It is attached. A reduction gear mechanism as a transmission gear mechanism configured by meshing gears is housed in the gear case 50, and the output shaft 68 and its main bearing 54 protrude from the bottom wall 51 of the gear case.

  The reduction gear G includes an upper base plate 62 and a base plate 64 as base members that are held at a predetermined interval by a plurality of shafts 66. The upper base plate 62 is provided with a main bearing 54 penetrating the output shaft 68 so as to protrude outward, and the base plate 64 is provided with a shaft end bearing 56 that supports the rear end of the output shaft 68 at a position facing the main bearing 54. Is provided.

  In the space between the upper base plate 62 and the base plate 64, the output shaft 68 is provided with an output gear 70, and the plurality of shafts 66 includes a drive shaft facing the space between the upper base plate 62 and the base plate 64. The transmission gears including a first transmission gear 67 meshing with the input gear 30 at the front end of 17 are sequentially supported so as to be rotatable, and these transmission gears are provided with a spacer on the shaft. The movement in the direction of the rotation axis is restricted. Of these transmission gears, the gears meshed between the first transmission gear 67 and the output gear 70 are not shown. The transmission gear including the first transmission gear 67 is a two-stage gear in which a large-diameter gear and a small-diameter gear are integrally formed coaxially, and the large-diameter gear of the input gear 30 and the first transmission gear 67 is It is composed of bevel gears. Note that the number of transmission gears constituting the reduction gear mechanism is not particularly limited, and may be one or more.

  Between the upper base plate 62 and the base plate 64, a plurality of pipes 72 penetrating between the two are provided. The gear case 50 is screwed into a screw hole (not shown) of the spacer 36 through a bolt 58 extending through the bottom wall 51 and the pipe 72 to the spacer 36, so that the speed reducer G is connected to the spacer 36 and the bottom wall 51. It is fixed to the spacer 36 by pressing between them. The main bearing 54 projects from the bottom wall 51 through the bearing window 52 of the gear case 50.

  When assembling the above motor with a transmission, first, the magnet 14 and the rotor R are sequentially assembled from the opening end of the housing 11 in which the bearing 28 is attached to the front wall 11a, and finally the rear wall 13 is attached and fixed. Then, in order to attach the reduction gear G, the spacer 36 is attached to the front wall 11a of the motor case 10 (housing 11) with a plurality of bolts (not shown).

  On the other hand, the main bearing 54 of the speed reducer G assembled as a unit is passed through the bearing window 52 of the gear case 50, and the pipe 72 of the speed reducer G and the through hole 60 of the gear case 50 are aligned to provide a bolt between them. 58 is passed. Then, the temporary assembly of the gear case 50 and the speed reducer G is brought onto the spacer 36, and the bolt 58 is screwed into a screw hole (not shown) of the spacer. As a result, the gear case 50 housing the reduction gear G and the motor M are coupled via the spacer 36.

  Next, the configuration of the braking mechanism 40 will be described. FIG. 2 is an enlarged view showing the vicinity of the braking mechanism 40. In the braking mechanism 40 of the present embodiment, the first transmission gear 67 rotates in the direction of arrow A in FIG. When an external force that rotates is generated, a braking force is generated and rotation can be stopped. The braking mechanism 40 includes a first braking member 42 and a second braking member 44. The first braking member 42 is formed in a disc shape, and is fixed to a convex portion 19 a that projects the central portion of the left end of the iron core 19 of the rotor R. The second braking member 44 is formed in a disc shape, and is fixed to the bearing 28 attached to the front wall 11 a of the housing 11 so as to face the first braking member 42. As the first braking member 42 and the second braking member 44, it is preferable to use a member having a relatively high coefficient of friction such as a urethane material or a rubber material, and the first braking member 42 and the second braking member 44 are in contact with each other. As a result, a braking force is generated.

  Next, the operation of the braking mechanism 40 will be described. As described above, the rotor R is normally maintained in a state where a slight gap is formed between the first braking member 42 and the second braking member 44 due to the magnetic attraction force of the magnet 14 with respect to the iron core 19. (The state of FIG. 2 (a)), even when the rotor R is rotated by supplying current, the state in which this gap is formed is maintained, but the speed reducer of the motor 1 with transmission is maintained. When the first transmission gear 67 rotates from the output shaft side of G in the direction of arrow A in FIG. 2B and the input gear 30 rotates in the direction of arrow B, the input gear 30 and the first gear Since the single transmission gear 67 is formed of the inclined gear as described above, a force acts on the input gear 30 and the gear 67 in the rotation axis direction (the direction of the arrow C in FIG. 2B). As a result, the entire rotor R slides by receiving a force in the left direction in the figure against the magnetic attraction force to the right by the magnet 14, and the first braking member 42 provided in the rotor R is the second. The rotation is stopped by the braking force between the first braking member 42 and the second braking member 44 in contact with the braking member 44 (the state shown in FIG. 2B).

The present embodiment is configured as described above, and is a transmission-equipped motor 1 in which a motor M and a speed reducer G that transmits the rotation of a drive shaft 17 of the motor M are connected. The motor M includes a stator S And a rotor R including a drive shaft 17, an input gear 30 is attached to the drive shaft 17, the rotor R is supported so as to be movable in the direction of the rotation axis, and the speed reducer G includes a motor A transmission gear mechanism for transmitting the rotation of the M drive shaft 17 to the output shaft 68 by one or more transmission gears including at least a first transmission gear 67 meshing with the input gear 30 attached to the drive shaft 17 of the motor M; The input gear 30 receives a force in the direction of the rotation axis when power is transmitted between the input gear 30 and the first transmission gear 67, and the first transmission gear 67 is arranged in the direction of the rotation axis. Supported by limited movement The motor-equipped motor 1 includes a braking mechanism 40 including a first braking member 42 and a second braking member 44, and the braking mechanism 40 presses the first braking member 42 and the second braking member 44. As a result, a braking force is generated, the first braking member 42 is fixed to the rotor R of the motor M, the second braking member 44 is fixed to the stator S of the motor M, and the output of the reduction gear G When a rotational force is applied to the shaft 68, the rotor R is moved in the rotational shaft direction by the rotational shaft force generated when power is transmitted between the input gear 30 and the first transmission gear 67. The first braking member 42 and the second braking member 44 are configured to be brought into pressure contact with each other by moving.
Thus, when an external force in the rotational direction is applied to the output shaft 68 of the speed reducer G, the rotor is rotated by the force in the rotational shaft direction generated when power is transmitted between the input gear 30 and the first transmission gear 67. The first braking member 42 fixed to the rotor R and the second braking member 44 fixed to the stator can be brought into pressure contact with each other to generate a braking force. Furthermore, since it is not necessary to separately provide a device such as an electromagnetic brake, the configuration is reduced in size and simplified.

  Further, if the external force received by the output shaft 68 increases, the force in the direction of the rotating shaft received by the rotor R increases, so that the pressure contact force between the first braking member 42 and the second braking member 44 increases and the braking force is increased. Will increase. That is, even if a large external force is applied to the output shaft 68, the braking force of the braking mechanism 40 is increased accordingly, so that the rotation can be stopped reliably.

  As another embodiment of the braking mechanism 40, as shown in FIG. 3, a plurality of hemispherical convex portions 42a are arranged in the circumferential direction on the first braking member 42, and a convex portion is provided on the second braking member 44. It is good also as a structure which generate | occur | produces braking force by arranging the some recessed part 44a of the shape which 42a just fits in the circumferential direction similarly to the convex part 42a, and fitting with each other. Further, the convex portion 42a and the concave portion 44a are not particularly limited as long as the convex portions 42a and the concave portions 44a are fitted to each other to generate a braking force, and the material does not need to have a particularly high friction coefficient. In the above embodiment, the first braking member 42 is attached to the iron core 19 of the rotor R, and the second braking member 44 is attached to the bearing 28. However, the first braking member 42 constitutes the rotor R. The second braking member 44 only needs to be attached to the members constituting the stator S.

  Further, the input gear 30 and the first transmission gear 67 are described as being constituted by the inclined gears. However, the present invention is not limited to this, and the input gear 30 is constituted by the worm and the first transmission gear 67 is constituted by the worm wheel. For example, the input gear 30 may be configured to receive a force in the direction of the rotation axis when transmitting power.

It is sectional drawing which shows the structure of the motor 1 with a transmission of an Example. It is the figure which expanded and showed the brake mechanism 40 vicinity. It is a figure which shows the modification of the 1st braking member and the 2nd braking member.

DESCRIPTION OF SYMBOLS 1 Motor with transmission M Motor S Stator R Rotor 10 Motor case 11 Housing 11a Front wall 13 Rear wall 14 Magnet 17 Drive shaft 19 Iron core 19a Convex part 20 Coil 22 Commutator 26 Brush 28 Bearing 29 Bearing 30 Between input gear 36 Seat 40 Brake mechanism 42 First brake member 44 Second brake member G Reducer 50 Gear case 51 Bottom wall 52 Bearing window 54 Main bearing 56 Shaft end bearing 58 Bolt 60 Through hole 62 Top plate 64 Base plate 66 Shaft 67 First speed change Gear 68 Output shaft 70 Output gear 72 Pipe

Claims (1)

A motor with a transmission in which a motor and a transmission that transmits rotation of a drive shaft of the motor are connected in series ,
The motor includes a stator and a rotor including a drive shaft, and an inclined input gear is attached to the drive shaft so that thrust is applied in a transmission direction, and the rotor is a rotation shaft. Supported to move in the direction,
The transmission includes a first transmission gear that is engaged with a rotation of a motor drive shaft in an inclined shape opposite to an input gear attached to the motor drive shaft, and at least one or more transmission gears. A transmission gear mechanism for transmitting to the output shaft, wherein the input gear receives a force in the direction of the rotating shaft when power is transmitted between the input gear and the first transmission gear; Is supported with limited movement in the rotation axis direction,
Motor with the transmission, a brake mechanism constituted by the first braking member and the second brake member comprises the space inside the motor, said braking mechanism and said first braking member and the second brake member A braking force is generated by the pressure contact, the first braking member is fixed to a convex portion on the transmission side of the rotor and projecting the central portion , and the second braking member is attached to the front wall of the housing. Affixed to the mounted bearing opposite the first braking member ;
When a rotational force is applied to the output shaft of the transmission, the rotor is rotated in the rotational axis direction by a rotational shaft force generated when power is transmitted between the input gear and the first transmission gear. thrust movement to a first braking member and the second brake member, a motor with transmission, characterized in that it is pressed through the fixing member each held in.

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