JP2008283780A - Clutch mechanism for rotating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clutch mechanism of a small rotary machine that is used for usage in which torque is required from the starting time of the rotary machine. <P>SOLUTION: The clutch mechanism K, which comprises a guide plate 13, on which a first guide surface 16 is provided on both protruding portions 22 on both sides of a recessed part 15; a weight 17, which is arranged movably inside the recessed part 15 and on both sides in the movement direction of which second guide surfaces 18 are formed; and lock members 19 provided in contact with the first and second guide surfaces 16, 18 and an output shaft casing 11, is incorporated between a rotor casing 9 and the output shaft casing 11 connected to an output shaft 5 provided coaxially at the outside circumference side of the rotor casing 9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a clutch mechanism of a rotating machine that transmits power from a driving source to an output shaft side in a rotating machine that is constantly subjected to a high load such as a compressor of a household refrigerator or a conveyor driving device.

  The present applicant has proposed a single-phase AC synchronous motor such as a cooling fan motor, for example, in order to realize a small and energy-saving drive. The operation of this single-phase AC synchronous motor will be explained. The current control of the excitation current flowing in the motor coil of the start-up operation circuit is alternately switched by the energization control by the controller and the inverting side input is suppressed with respect to the non-inverting side input. When the start-up operation is performed and the rotation speed of the permanent magnet rotor reaches the vicinity of the synchronous rotation speed, the operation changeover switch is switched to the synchronous operation circuit and the control is shifted to the synchronous operation.

In the single-phase AC synchronous motor described above, the magnetic pole part (pole tooth) facing the rotor of the stator core is magnetically shaped with respect to the magnetic pole center so that the rotor rotates in one direction from the rotation stop state. (See Patent Document 1).
JP 2007-37234 A

  The above-described single-phase AC synchronous motor is suitable for applications that require a relatively small starting torque, but is not suitable for a driving device in which a high load acts at the time of starting, for example, a compressor or a conveyor.

  From the viewpoint of motor drive efficiency, it is desirable to provide a clutch mechanism so that the motor is started up in a state where the load does not act as low as possible (low load) and is connected to the load in a state where the rotational speed is increased and the motor torque is increased. However, conventional friction clutches and single-plate / multi-plate clutches have a large number of parts and are large, and there is no clutch mechanism suitable for a small motor.

  An object of the present invention is to provide a clutch mechanism for a small rotating machine that is also used for applications that require torque from the time of starting the rotating machine.

In order to achieve the above object, the present invention has the following configuration.
A clutch mechanism of a rotating machine that transmits rotational drive of a rotor to an output shaft, and an output connected to a rotor case arranged to face the stator and an output shaft provided concentrically on the outer peripheral side of the rotor case Between the shaft case, at least one concavo-convex portion is formed on the outer peripheral surface, and the guide plate is provided with the first guide surfaces on both side bulge portions of the concave portion, and is movably disposed in the concave portion on both sides in the moving direction. A clutch mechanism including a weight having a second guide surface and a lock member provided in contact with the first and second guide surfaces and the output shaft case is incorporated.
Also, when the rotor starts, only the rotor case facing the stator rotates, and when the number of rotation increases and the weight moves radially outward in the recess by centrifugal force, the lock member is pushed by the second guide surface. The rotor case and the output shaft case are mechanically connected to each other while the pressure on the first guide surface and the output shaft case is strengthened by the moving and rust effect, and the drive is transmitted from the rotor to the output shaft.
Further, the guide plate is fixed to the end face of the rotor case, and the weight and the lock member are guided by the guide plate and arranged in a gap surrounded by the rotor case and the output shaft case.
In addition, the angle θ1 formed between the tangents passing through the respective contacts S1 and S2 on the envelope drawn by the lock member that moves while contacting the first guide surface and the output shaft case is the first guide surface that the lock member is in contact with. In addition, the inclination of the first guide surface is set so as to be larger than the friction angle with the wall surface of the output shaft case, and the extension lines of the second guide surfaces formed on both sides of the weight moving direction intersect each other. The inclination of the second guide surface is set so that the angle θ2 formed is larger than the friction angle of the second guide surface with which the lock members are in contact.

The clutch mechanism of the rotating machine according to the present invention includes a centrifugal mechanism between a rotor case disposed so as to face the stator and an output shaft case connected to an output shaft provided concentrically on the outer peripheral side of the rotor case. Since the weight-moving weight, the first and second guide surfaces, and the lock member provided in contact with the output shaft case are incorporated, only the rotor case facing the stator rotates when the rotor starts to start. The lock member slides while abutting against the first and second guide surfaces and the output shaft case. When the number of rotation increases and the weight moves radially outward in the recess by centrifugal force, the lock member is moved to the second guide. The rotor case and the output shaft case are mechanically connected to each other while the pressure on the first guide surface and the output shaft case is strengthened by the rust effect by the rust effect, and the drive is transmitted from the rotor to the output shaft.
Therefore, when starting up, the rotating machine is started in a state where the load does not act as much as possible (low load), and it is connected to the load with the number of revolutions and motor torque increasing, so it is also applicable to applications that require torque from the start can do. Further, since the locking members pressed against the first guide surface on both sides of the weight are locked, the drive transmission corresponding to the load can be performed even when the rotor is rotated forward or reverse.
Further, the guide plate is fixed to the end surface of the rotor case, and the weight and the lock member are guided by the guide plate and disposed in a gap surrounded by the rotor case and the output shaft case. Since it can be assembled in a small space, it is possible to promote downsizing of the apparatus together with the drive source.
In addition, the angle θ1 formed between the tangents passing through the respective contacts S1 and S2 on the envelope drawn by the lock member that moves while contacting the first guide surface and the output shaft case is the first guide surface that the lock member is in contact with. In addition, the inclination of the first guide surface is set so as to be larger than the friction angle with the inner wall surface of the output shaft case, and the extension lines of the second guide surface formed on both sides of the weight moving direction intersect each other. Since the inclination angle of the second guide surface is set so that the angle θ2 formed by the arm is larger than the friction angle of the second guide surface with which the lock member is in contact, the first and second guide surfaces and the output It is possible to prevent the weight contacting the inner wall surface of the shaft case from being locked by the static frictional force.

The best mode for carrying out the invention will be described in detail below with reference to the accompanying drawings. First, a clutch mechanism incorporated in a single-phase AC synchronous motor as an example of a rotating machine will be described with reference to FIGS.
1 and 2, an outer rotor type single-phase 6-pole AC synchronous motor M that drives a reciprocating compressor, for example, will be described.

In a single-phase AC synchronous motor M, a rotor (rotor) 3 and a stator (stator) 4 are assembled in a housing H formed by a motor case 1 and a lid 2.
An output shaft 5 is fitted in the motor case 1. The rotor 3 is rotated integrally with the output shaft 5. The output shaft 5 is rotatably supported by a first bearing 6 fitted in the lid 2 and a second bearing 7 fitted in the motor case 1. In this embodiment, the output shaft 5 is provided so as to penetrate the stator core 8, and the mounting plate 2 side protrudes out of the housing H. The stator 4 is provided in a space surrounded by the rotor case 9. The stator 4 is formed with a plurality (six locations) of pole teeth 10 facing the rotor case 9 from the stator core 8 surrounding the output shaft 5. A motor coil 21 is wound around each pole tooth 10 via an insulator (bobbin) 20 (see FIG. 2).

  The configuration of the rotor 3 will be described. In the housing H, a cylindrical output shaft case 11 is integrally assembled with an output shaft 5 that is rotatably supported by first and second bearings 6 and 7. In the output shaft case 11, the output shaft 5 is press-fitted into a press-fit portion 12 erected in the axial direction along the shaft hole. The rotor case 9 is provided with a ring-shaped permanent magnet 9a on the inner peripheral surface. The permanent magnet 9 a is disposed to face the pole teeth 10 of the stator core 8.

The rotor case 9 is assembled concentrically with the output shaft case 11.
That is, the rotor case 9 is positioned on the radially outer side by the inner wall surface of the output shaft case 11. The rotor case 9 is positioned by being guided by the guide plate 13 and the E-ring 14 in the axial direction. The guide plate 13 is fixed to the outer end surface of the rotor case 9 and is provided in a gap with the output shaft case 11. Further, the E ring 14 is elastically fitted into a circumferential groove 11 a provided on the inner wall surface near the opening of the output shaft case 11.

  A clutch mechanism K is provided in the gap between the end surface of the rotor case 9 and the end surface of the output shaft case 11. The clutch mechanism K transmits and disconnects driving from the rotor case 9 to the output shaft 5 via the output shaft case 11.

  An example of the clutch mechanism K will be described. The guide plate 13 is fixed to the outer end surface of the rotor case 9 with screws. In FIG. 3, the guide plate 13 is provided with at least one or more (six in this embodiment) concavo-convex portions on the outer peripheral surface, and the first guide surfaces 16 are provided on the convex portions 22 on both sides of the concave portion 15. . In addition, when providing the recessed part 15 and the convex part 22 in one place, it is necessary to balance the convex part 22 equivalent to the other side of the recessed part 15. FIG.

  A weight 17 is provided in each recess 15 so as to be movable in the radial direction. Each weight 17 is formed with second guide surfaces 18 on both sides in the moving direction. A lock member 19 is provided in the space surrounded by the first and second guide surfaces 16 and 18 and the output shaft case 11. The lock member 19 has a disc shape, but the shape is not particularly limited as long as it has a curved surface that moves in contact with the weight 17.

  In FIG. 4, the angle θ1 formed by the tangents passing through the contacts S1 and S2 on the envelope drawn by the lock member 19 that moves while contacting the first guide surface 16 and the output shaft case 11 is determined by the lock member 19 respectively. The inclination of the first guide surface 16 is set so as to have a value (for example, 15 °) larger than the friction angle (approximately 12 °) between the first guide surface 16 and the inner wall surface 23 of the output shaft case. Further, the angle θ2 formed by the extension lines of the second guide surfaces 18 formed on both sides of the weight 17 in the moving direction intersects with the friction angle (approximately 12 °) of the second guide surfaces 18 with which the lock members 19 contact each other. ) The inclination of the second guide surface 18 is set to be a larger value (for example, 15 °). Thereby, it can prevent that the weight 17 which contact | connects the 1st, 2nd guide surfaces 16 and 18 and the output shaft case inner wall surface 23 is locked by static frictional force.

  In FIG. 4, only the rotor case 9 facing the stator 4 rotates when the rotor 3 starts to start, and the lock member 19 slides while contacting the first and second guide surfaces 16 and 18 and the output shaft case 11. . When the number of rotations of the rotor 3 increases, the weight 17 is moved radially outward (see arrow P) by the centrifugal force and pushes the lock member 19 with the second guide surface 18 to cause the first effect due to the rust effect. The rotor case 9 and the output shaft case 11 are mechanically connected to each other and the drive transmission is transmitted from the rotor 3 to the output shaft 5 by increasing the pressure on the guide surface 16 and the output shaft case 11 (see arrow Q). Therefore, only the rotor case 9 rotates at a low speed rotation at which the rotor 3 starts to start, and when the predetermined number of rotations is reached, the weight 17 moves by centrifugal force, and the rotor case 9 and the output shaft case 11 are connected by the lock members 19 on both sides. Is done. Start up the rotating machine in a state where the load does not act as much as possible (low load) at startup, and connect it to the load in a state where the rotation speed is increased and the motor torque is increased, so apply to applications that require torque from the start Can do. In addition, since the lock members 19 pressed against the second guide surface 18 are locked on both sides of the weight 17, drive transmission corresponding to the load can be performed even when the rotor 3 is rotated forward or reverse.

  Further, the guide plate 13 is fixed on the end face of the rotor case 9, and the weight 17 and the lock member 19 are guided by the guide plate 13 and are disposed in a gap surrounded by the rotor case 9 and the output shaft case 11. Therefore, since the clutch mechanism K can be assembled in a small space inside the rotating machine, it is possible to promote downsizing of the apparatus together with the drive source.

  The single-phase AC synchronous motor M is not limited to single-phase six-poles, but includes various types such as multi-pole motors such as single-phase two-poles and single-phase four-poles, DC motors such as brush motors, AC motors, and induction motors. A simple motor may be used.

Here, an example of an assembly process of the clutch mechanism K of the rotating machine will be described with reference to FIG.
A permanent magnet 9 a is fixed to the inner peripheral surface of the rotor case 9, and a guide plate 13 is fixed to the outer end surface of the rotor case 9 with screws. A lock member 19 is disposed in contact with the weight 17 and the second guide surface 18 in the recess 15 of the guide plate 13. The rotor case 9 is inserted into the opening of the output shaft case 11 into which the output shaft 5 is press-fitted until the guide plate 13 abuts against the inner end surface of the output shaft case 11. The E-ring 14 is fitted into the circumferential groove 11a of the output shaft case 11, and the rotor case 9 is positioned in the axial direction. The output shaft case 11 is inserted into the motor case 1 in which the stator 4 is assembled, and one end of the output shaft 5 is fitted into the second bearing 7. Further, the first bearing 6 is inserted through the other end of the output shaft 5. Finally, the lid 2 can be assembled to the motor case 1 by being superposed and screwed.

  In the above embodiment, the clutch mechanism K incorporated in a single-phase AC synchronous motor as a rotating machine is exemplified. However, for example, a conveyor device such as a belt conveyor that requires a starting torque may be used, or a driving source such as a generator or an engine. Therefore, it can be applied to a wide range of rotating machines in which drive transmission is performed.

It is sectional drawing of the single phase alternating current synchronous motor which incorporated the clutch mechanism. It is a partially broken perspective view of the single phase alternating current synchronous motor of FIG. It is a top view of a clutch mechanism. FIG. 4 is a partially enlarged view showing the operation of the clutch mechanism of FIG. 3. It is a disassembled perspective view of the single phase alternating current synchronous motor of FIG.

Explanation of symbols

K clutch mechanism M single-phase AC synchronous motor H housing
1 Motor case
2 lid
3 Rotor
4 Stator
5 Output shaft
6 First bearing
7 Second bearing
8 Stator core
9 Rotor case
9a Permanent magnet
10 pole teeth
11 Output shaft case
12 Press-in part
13 Guide plate
14 E-ring
11a Circumferential groove
15 recess
16 First guide surface
17 weights
18 Second guide surface
19 Locking member
20 Bobbin 21 Motor coil 22 Convex part 23 Output shaft case inner wall surface

Claims (4)

A clutch mechanism of a rotating machine that transmits rotational drive of a rotor to an output shaft,
Between the rotor case arranged to face the stator and the output shaft case connected to the output shaft provided concentrically on the outer peripheral side of the rotor case, at least one uneven portion is formed on the outer peripheral surface. A guide plate provided with first guide surfaces on both convex portions of the concave portion, a weight movably disposed in the concave portion and formed with second guide surfaces on both sides in the moving direction, and first and second guides A clutch mechanism of a rotating machine in which a clutch mechanism having a lock member provided in contact with a surface and an output shaft case is incorporated.   When the rotor starts, only the rotor case facing the stator rotates, and when the number of rotation increases and the weight moves radially outward in the recess by centrifugal force, the lock member is pushed by the second guide surface. The clutch for a rotating machine according to claim 1, wherein the rotor case and the output shaft case are mechanically connected to each other while the pressure on the first guide surface and the output shaft case is strengthened by the wedge effect, and the drive is transmitted from the rotor to the output shaft. mechanism.   The clutch mechanism for a rotating machine according to claim 1, wherein the guide plate is fixed to an end surface of the rotor case, and the weight and the lock member are disposed in a gap surrounded by the rotor case and the output shaft case, the movement being guided by the guide plate.   The angle θ1 formed between the tangents passing through the contacts S1 and S2 on the envelope drawn by the lock member that moves while contacting the first guide surface and the output shaft case is determined by the first guide surface and the output with which the lock member is in contact. The inclination of the first guide surface is set so as to be larger than the friction angle with the inner wall surface of the shaft case, and the extension lines of the second guide surfaces formed on both sides of the weight moving direction intersect each other. 2. The clutch mechanism for a rotating machine according to claim 1, wherein the inclination of the second guide surface is set so that the angle θ <b> 2 is larger than the friction angle of the second guide surface with which the lock member is in contact.

Images