JP2013179142A - Rotary solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary solenoid capable of converting a linear motion into a rotational motion and not requiring a permanent magnet, thereby reducing costs.
When a coil 7 is energized, a movable gear 40 is displaced in the axial direction, a protrusion of the movable gear 40 slides in a groove 21 of a second housing 20, and a movable wave gear 40a is moved to an inner peripheral gear 32a. The inner gear 32a meshes with the tooth surface. When energization of the coil 7 is released, the rotating shaft 30 moves in the axial direction by the biasing force of the spring 6, and the outer peripheral gear 31 a of the rotating shaft 30 slides on the tooth surface of the fixed wave gear 20 a of the second housing 20. Thus, the rotary shaft 30 is rotated.
[Selection] Figure 1

Description

  The present invention relates to a rotary solenoid, and relates to a structure of a rotary solenoid.

  2. Description of the Related Art Conventionally, a rotary solenoid has a fixed iron core in a housing, a plunger arranged to oppose it, a plate connected to the plunger, and a plate having a ball race groove formed on the circumference so as to rotate by a predetermined angle and a ball race groove. There is known a configuration in which a plurality of bearing balls interposed between and a shaft and a coil connected to a plate are incorporated. In this configuration, the bearing ball, which is rotatable with respect to the housing, is pressed against the housing side by electromagnetic force generated when the coil provided in the housing is energized. Is moving in an axial direction and instantaneously rotating at a certain angle. And the rotary solenoid which returns a plate and a shaft to an initial position with the restoring force of a spring when the electricity supply to a coil is cancelled | released is known. The rotary solenoid configured as described above has a permanent magnet disposed on a fixed iron core inside the housing, and retains the plunger with the magnetic force of the permanent magnet even when the energization of the coil is released (see, for example, Patent Document 1).

JP 2001-60511 A

  However, in the rotary solenoid shown in Patent Document 1, when a coil provided in the housing is energized, it rotates in a certain angle while moving in the axial direction, and when energization is released, it returns to the initial position, and the ball race groove Only the angle at which the bearing ball moves is rotatable. That is, in the above-described configuration, the plate cannot be rotated once, so that there is a problem that linear motion cannot be converted into sufficient rotational motion.

  Further, when energization is released, the plunger can be held in a predetermined position by the magnetic force of the permanent magnet, but there is a problem that the cost increases because the permanent magnet is used.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a rotary solenoid that can be reduced in cost without being restricted by a rotation angle, requiring a permanent magnet.

  The problem-solving means of the present invention includes a first housing, a coil disposed inside the first housing and energized from outside, and disposed inside the first housing, and energizing the coil. A plunger that is movable in the axial direction; a second housing that is arranged coaxially with the first housing, has a plurality of circumferentially fixed wave-like gears, and has a groove formed in the axial direction; A plurality of movable wavy gears are formed in a circumferential shape, and have a protrusion that slides in the groove, and are displaced in the axial direction by movement of the plunger, and a plurality of circumferential outer gears And an inner peripheral gear is formed inside the outer peripheral gear, and a rotation shaft that changes the displacement in the axial direction of the movable gear to a displacement in the rotation direction, and between the rotation shaft and the second housing. Arranged and formed on the rotating shaft A spring that urges the outer peripheral gear in a direction to mesh with the fixed wave gear, the movable gear is displaced in the axial direction by energization of the coil, and the protrusion of the movable gear is the second housing. When the movable wavy gear slides on the tooth surface of the inner peripheral gear to engage with the inner peripheral gear, and the energization to the coil is released, the rotating shaft is moved to the spring. The rotating shaft is rotated by the outer peripheral gear of the rotating shaft sliding on the tooth surface of the fixed wave gear of the second housing.

  In the above structure, it is preferable that when the energization of the coil is released, the outer peripheral gear meshes with the fixed wave gear, and the rotating shaft and the movable gear are self-held in the second housing.

  In the rotary solenoid according to the present invention, the movable gear is displaced in the axial direction by energization of the coil, the protrusion of the movable gear slides in the groove of the second housing, and the movable wave gear slides the tooth surface of the inner peripheral gear. Engage with the inner gear by moving. Further, when energization of the coil is released, the rotating shaft moves in the axial direction by the biasing force of the spring, and the rotating shaft is moved to a predetermined position by the outer peripheral gear of the rotating shaft sliding on the tooth surface of the fixed wave gear of the second housing. Rotate by an angle (an angle of a fixed wave gear). Therefore, since the rotating shaft rotates by a predetermined angle by repeatedly turning on and off the energization to the coil, it is possible to rotate more than one rotation. In this configuration, no permanent magnet is required, and the cost can be reduced.

  Further, when the energization to the coil is released, the rotating shaft moves in the axial direction by the biasing force of the spring, and the outer peripheral gear of the rotating shaft meshes with the fixed wave gear of the second housing. Therefore, since the rotating shaft and the movable gear are mechanically self-held in the second housing, it is not necessary to continuously energize the coil, and power consumption can be suppressed.

It is sectional drawing which shows the structure of the rotary solenoid which concerns on this invention. It is the elements on larger scale of the invention essential point of the rotary solenoid shown in FIG. It is a perspective view of the rotating shaft shown in FIG. It is a perspective view of the movable gear shown in FIG. It is explanatory drawing of the rotating shaft shown in FIG. 2, (a) Side view and (b) Front view. It is explanatory drawing of the 2nd housing shown in FIG. 2, (a) The schematic diagram which looked at the fixed wave-like gear and the groove part seeing through the inside from the side, and (b) The schematic diagram which looked at the groove part from the front. It is explanatory drawing of the movable gear shown in FIG. 2, (a) Side view and (b) Front view.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view of the rotary solenoid 1. The rotary solenoid 1 is used when converting linear motion into rotational motion. In the rotary solenoid 1, a coil 7 that generates magnetic force is disposed inside a hollow cylindrical first housing 2, and a plunger 8 that is movable in the axial direction is disposed inside the coil 7 with the first housing 2. It is disposed at a coaxial position. The direction shown on the right side of FIG. 1 is defined here as the rear, and the direction shown on the left side is defined as the front. In the rear part of the first housing 2, an external connector 10 is disposed in a state of being supported by the first housing 2 so as to be fitted with an external connector for electrical connection. A cylindrical shaft 9 that is coaxial with the plunger 8 is disposed in front of the plunger 8 in the axial direction. A cylindrical second housing 20 is coaxially disposed in front of the first housing 2 in the axial direction so as to be coaxial with the first housing 2. A movable gear 40 and a rotary shaft 30 that are displaced in the axial direction are disposed inside the second housing 20, and a spring 6 is disposed between the rotary shaft 30 and the second housing 20. And both ends of the spring 6 are provided with resin-made thrust bearings 11.

  FIG. 2 is a partially enlarged view of the essential point of the invention of the rotary solenoid 1. FIG. 4 is an exploded perspective view in which a rotary shaft 30 and a movable gear 40 are assembled inside the second housing 20. The rotating shaft 30 includes an outer peripheral portion 31 having a diameter larger than that of the shaft portion 33 and an inner peripheral portion 32 having a diameter smaller than that of the outer peripheral portion 31 in the radial direction at end portions of the shaft portion 33 and the hollow cylindrical shaft portion 33. The side including the inner peripheral portion 32 of the rotating shaft 30 is assembled to the hole portion 22 of the second housing 20. On the other hand, the movable gear 40 is inserted into the inside of the circumference from the A direction (direction from the front to the rear), and includes two protrusions 42 and twelve mountain-shaped movable wave gears 40a at the ends. The movable gear 40 is inserted from a coaxial B direction (a direction from the rear to the front) of the second housing 20 and assembled from the hole 22 on the opposite side of the rotation shaft 30 of the second housing 20.

  FIG. 3 is a perspective view of the rotating shaft 30 shown in FIG. The rotating shaft 30 has a hollow cylindrical shape, and a disk-shaped outer peripheral portion 31 is formed on the rear side in the axial direction. The outer peripheral portion 31 has six outer peripheral gears 31a (with side walls extending in the axial direction and having a tapered surface in the circumferential direction between adjacent side walls) at the positions of 60 ° intervals in the circumferential direction. In the direction. The inner peripheral portion 32 connected to the outer peripheral portion 31 is formed integrally with the inner diameter of the outer peripheral gear 31a, and has twelve wavy inner peripheral gears 32a (the diameter is the outer peripheral gear 31a) at equal intervals on the circumference. (Hollows having a diameter of 2/3) are provided at intervals of 30 degrees. A circular hole 34 through which the shaft 9 is passed is formed in the shaft center of the shaft portion 33.

  FIG. 4 is a perspective view of the movable gear 40 shown in FIG. The cylindrical movable gear 40 has a cylindrical shape having the same diameter as that of the outer peripheral gear 31a, and is twelve in the circumferential direction that meshes with the inner peripheral gear 32a at intervals of 30 degrees on the side inserted into the second housing 20. The mountain-shaped movable wavy gear 40a is provided, and two protruding portions 41a extending in the axial direction are provided at positions shifted by 180 degrees on the outer peripheral portion 42. A circular hole 43 into which the shaft 9 is inserted is formed in the axis of the movable gear 40. Both the rotating shaft 30 and the movable gear 40 are hollow, and are coaxial when the shaft 9 is passed through, thereby preventing the shake during rotation.

  FIG. 5 is an explanatory diagram of the rotating shaft 30 shown in FIG. 2, (a) is a side view, and (b) is a front view. The shape seen from the side surface of the outer peripheral gear 31a of the rotating shaft 30 is such that a semi-trapezoidal protruding portion extending in the axial direction is connected to the front in the circumferential direction. The side shape of the inner peripheral gear 32a of the rotating shaft 30 is triangular with respect to the axial direction. The six inner peripheral gears 32 a of the rotating shaft 30 can mesh with the movable gear 40 of the movable gear 40.

  FIG. 6 is an explanatory view of the second housing 20 shown in FIG. 2, and (a) is an explanatory view of the fixed wavy gear and the groove portion seen through from the side to facilitate understanding, (B) is explanatory drawing which looked at the groove part from the front. The second housing 20 has a hollow cylindrical shape made of resin. Twelve fixed wave gears 20a are formed at equally spaced positions on the inner circumferential side in the circumferential direction, and are substantially rectangular parallelepiped at two opposing positions in the axial direction. A groove portion 21 is formed, and the fixed wave gear 20a and the inner peripheral gear 32a of the rotating shaft 30 are engaged with each other.

  FIG. 7 is an explanatory diagram of the movable gear 40 shown in FIG. 2, (a) is a side view of the movable gear 40, and (b) is a side view. The movable gear 40 is made of resin, and a triangular movable wave gear 40a having 12 peaks on the front end face is formed. The movable wave gear 40a can mesh with the inner peripheral gear 32a of the rotating shaft 30. Moreover, the protrusion part 42 (outer diameter is the circular arc shape of a 1st housing) is formed in two places in the position which shifted | deviated 180 degree | times of the circumference part of the movable gear 40. FIG. The protruding portion 42 has a structure that slides within the groove portion 21 of the second housing 20.

  Next, operation | movement of the rotary solenoid 1 of this invention is demonstrated with an effect | action.

  When energization is performed from the external connector 10 and the coil 7 is energized, a closed circuit is formed between the plunger 8 inside the first housing 2 and a yoke disposed at a predetermined interval in front of and behind the plunger 8. As a result, an electromagnetic force is generated, and the plunger 8 moves forward in the axial direction in response to the electromagnetic force. Then, the shaft 9 disposed coaxially with the plunger 8 is also pressed, and the shaft 9 moves forward simultaneously with the plunger 8 and is displaced. And it is pressed by the flange part 9a formed in the middle of the axial direction of the shaft 9, and the movable gear 40 and the rotating shaft 30 move ahead in an axial direction. On the other hand, when the power supply to the coil 7 is released, the plunger 8 moves to the rear initial position (position shown in FIG. 1) in the axial direction and is displaced, and the rotating shaft 30, the movable gear 40 and the shaft are urged by the urging force of the spring 6. 9 returns to the initial position before the coil 7 is energized. In this case, the friction in the rotation direction of the spring 6 is reduced by using the thrust bearing 11 made of resin.

  During the above-described operation, the two protrusions 41a of the movable gear 40 are fitted into the groove portion 21 of the second housing 20 at the initial power off position (initial state) before the coil 7 is energized. The plane portion 31c extending in the axial direction from the apexes 31b of the six outer peripheral gears 31a of the rotating shaft 30 is matched with the plane portion extending in the axial direction from the apexes 32a of the fixed wave gear 20a of the second housing 20. In a contact state, the two mesh with each other, and the position is maintained at that position, and the state where it does not move is maintained.

  When the coil 7 is energized from this state, the plunger 8 moves forward in the axial direction, and accordingly the shaft 9 is pushed forward in the axial direction and moved. As the shaft 9 moves, the movable gear 40 and the rotary shaft 30 are also pushed out in the same manner. The outer peripheral gear 31 a of the rotating shaft 30 moves forward in the axial direction of the movable wave gear 40 a, so that the protruding portion 42 of the movable gear 40 moves forward in the two grooves 21 formed diagonally of the second housing 20. It slides and moves straight forward in the axial direction. As a result, the outer peripheral gear 31a of the rotary shaft 30 and the fixed wave gear 20a of the second housing 20 are disengaged, and the inner peripheral gear 32a of the rotary shaft 30 becomes non-rotatable in the radial direction. It will be in the state which slides along the gear 32a and meshes | engages completely. With the above operation, the displacement of the movable gear 40 in the axial direction is converted into the displacement in the rotational direction, and the movable gear 40 rotates by a predetermined angle (here, 15 degrees).

  When the coil 7 is de-energized from the above state (power off), the rotating shaft 30 pushes back the movable gear 40 in the axial direction by the biasing force of the spring 6. Here, the outer peripheral gear 31a of the rotating shaft 30 slides along the tooth surface 20c of the fixed wave gear 20a of the second housing 20, and the rotating shaft 30 further rotates by a predetermined angle (15 degrees). The plunger 8 moves to the rear initial position by the above displacement.

  The rotation angle of the rotation shaft 30 can be controlled to rotate the rotation shaft 30 to an arbitrary rotation angle by changing the number of teeth of the outer peripheral gear 31a of the rotation shaft 30 and the movable wave gear 40a of the movable gear 40. become. Then, by turning on and off the power supply a predetermined number of times by energizing the coil 7, the rotating shaft 30 can be rotated by a desired angle or the number of times.

  Next, the effect will be described.

  In the rotary solenoid 1 of the present invention, when the coil 7 is energized, the movable gear 40 is displaced in the axial direction, and the protrusion 42 of the movable gear 40 slides in the groove portion 21 of the second housing 20, so When the gear 40a slides on the tooth surface 20c of the inner peripheral gear 32a, the gear 40a meshes with the inner peripheral gear 32a, and the plunger 8 pushes up the movable gear 40 and the rotary shaft 30 via the shaft 9 and rotates slightly. When the energization of the coil 7 is released, the rotary shaft 30 moves in the axial direction by the biasing force of the spring 6, and the outer peripheral gear 31a of the rotary shaft 30 slides on the tooth surface 20c of the fixed wave gear 20a of the second housing 20. . Since the rotating shaft 30 rotates by repeatedly turning on and off the coil 7, the linear motion can be converted into the rotational motion without being restricted by the rotation angle, and no permanent magnet is required. Cost can be reduced. And since it operate | moves only by turning ON / OFF the electricity supply to the coil 7, it is easy to simplify a system.

  When the energization of the coil is released, the rotating shaft 30 is moved in the axial direction by the biasing force of the spring 6, and the outer peripheral gear of the rotating shaft 30 meshes with the fixed wave gear of the second housing 20. Therefore, since the rotating shaft and the movable gear are mechanically self-held in the second housing, a permanent magnet is not required, continuous energization to the coil 7 is unnecessary, and power consumption can be suppressed.

DESCRIPTION OF SYMBOLS 1 Rotary solenoid 2 1st housing 6 Spring 7 Coil 8 Plunger 20 2nd housing 20a Fixed wave-like gear 21 Groove part 30 Rotating shaft 31a Outer gear 32a Inner gear 40 Movable gear 40a Movable wave gear 42 Protrusion part

Claims (2)

A first housing;
A coil disposed inside the first housing and energized from outside;
A plunger disposed in the first housing and movable in an axial direction by energization of the coil;
A second housing disposed coaxially with the first housing and having a plurality of fixed wave gears formed circumferentially therein and having a groove formed in the axial direction;
A plurality of movable wavy gears are formed in a circumferential shape, and have a protrusion that slides in the groove, and a movable gear that is displaced in the axial direction by movement of the plunger,
A plurality of outer peripheral gears are formed in a circumferential shape, an inner peripheral gear is formed inside the outer peripheral gear, and a rotary shaft that changes the axial displacement of the movable gear to a rotational displacement;
A spring disposed between the rotating shaft and the second housing and energizing the outer peripheral gear formed on the rotating shaft in a direction to mesh with the fixed wave gear; When the gear is displaced in the axial direction, the protrusion of the movable gear slides in the groove of the second housing, and the movable wavy gear slides on the tooth surface of the inner peripheral gear. Meshing with the circumferential gear,
When energization of the coil is released, the rotating shaft moves in the axial direction by the biasing force of the spring, and the outer peripheral gear of the rotating shaft slides on the tooth surface of the fixed wave-like gear of the second housing. A rotary solenoid that rotates the rotating shaft.   2. The device according to claim 1, wherein when energization of the coil is released, the outer peripheral gear meshes with the fixed wave gear, and the rotating shaft and the movable gear are self-held within the second housing. Rotary solenoid.

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