JP3652509B2 - Sensor magnet device for motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor sensor magnet device that applies a magnetic force to a rotation detection element by rotating together with an armature shaft.
[0002]
[Prior art]
As the sensor magnet device of the motor that gives magnetic force to the rotation detection element by rotating with the armature shaft, the magnet is not high in strength, so it is not possible to use caulking fixing or press fitting fixing, A cylindrical magnet was fixed to the outside of the cylindrical member fitted to the armature shaft by mounting.
[0003]
[Problems to be solved by the invention]
That the sensor magnet device of the motor noted previously, the time to paint an adhesive between the magnet and the cylindrical member, and, because it is necessary to set the step assembling a drying time until the glue dries, becomes many steps There was a problem. In addition, the skill in painting the adhesive is complicated, and the work is complicated and the quality control becomes troublesome. If the magnet is not securely fixed to the cylindrical member, the magnet is rotated by the armature shaft. However, there is a problem that it may be detached from the cylindrical member, and it has been a problem to solve these problems.
[0004]
OBJECT OF THE INVENTION
The object of the present invention is to provide a sensor magnet device for a motor that can fix the magnet extremely easily and reliably.
[0005]
[Structure of the invention]
[0006]
[Means for Solving the Problems]
In the sensor magnet device for a motor according to claim 1 of the present invention, a magnet having a cylindrical magnet and an armature shaft fitting portion that is fitted to an armature shaft provided in the armature of the motor and through which the magnet is inserted and supported. A sensor magnet device for a motor that includes a holder having a support portion and rotates with the armature shaft to apply a magnetic force to the rotation detection element . The holder has a shaft of a holder main body on which the magnet support portion is formed. a magnet pressing tongue capable pressing the magnet resiliently by being bent to the direction of the formed at one end a magnet supported on the magnet support portion, formed at the other end portion in the axial direction of the holder body With a disk-shaped magnet contact plate that can contact the magnet The magnet abutting plate portion is formed in the circumferential direction of the magnet abutting plate portion, holds a magnet pressed by the magnet pressing tongue piece portion, and has a plurality of plate portion main bodies for axial positioning, and a plate A plurality of pressing portions that are formed with a length in the circumferential direction smaller than the main body and have elasticity and elastically hold the magnet pressed by the magnet pressing tongue piece portion toward the magnet pressing tongue piece portion; The magnet pressing contact protrusions that locally hold the magnet pressed by the magnet pressing tongue piece protrude from the plurality of pressing portions. It is characterized in that it has a configuration that is set.
[0007]
In the sensor magnet device for a motor according to claim 2 of the present invention, the magnet has a holder insertion portion supported by the magnet support portion of the holder, and a predetermined direction from the holder insertion portion in the radial direction. A holder positioning part that has a width dimension and is recessed in an arc shape is formed, and a predetermined width dimension that prevents the magnet from rotating by fitting into the holder positioning part of the magnet at a part on the outer circumference of the holder body And a magnet positioning portion protruding in an arc shape is formed on the magnet support portion .
[0008]
[Effects of the Invention]
In the sensor magnet device for a motor according to claim 1 of the present invention , a plurality of pressing portions and a plurality of plate portion main bodies are alternately arranged in the circumferential direction of the magnet abutting plate portion via the notches, and each pressing portion Since the circumferential length of each plate portion body is smaller than the circumferential length of each plate portion body, each pressing portion can be made elastic and is elastically held by a plurality of pressing portions. When the magnet is supported by the plate body, positioning in the axial direction is performed, and displacement of the magnet in the axial direction is prevented. Further, after the magnet is inserted into the magnet support portion of the holder, the magnet is elastically pressed by the magnet pressing tongue portion formed at one end portion in the axial direction of the holder main body and the other end portion in the axial direction of the holder main body. Formed on the magnet contact plate portion and elastically held by a pressing portion facing the magnet pressing tongue piece portion, and further held locally by a pressing contact protrusion formed on the pressing portion. Thereby, a magnet is reliably fixed to a holder elastically only by bending of a magnet press tongue piece part.
[0009]
In the sensor magnet device for a motor according to claim 2 of the present invention, the magnet is locked to the holder when the holder positioning portion of the holder insertion portion engages with the magnet positioning portion of the holder. Therefore, in addition to the operation of the first aspect, since the magnet is prevented from rotating, the displacement in the circumferential direction is prevented.
[0010]
【Example】
1 to 9 show an embodiment of a sensor magnet device for a motor according to the present invention.
[0011]
Sensor magnet device for a motor that shown (hereinafter, will have a sensor magnet device.) 1, the magnet 2 is composed of the holder 3 is mounted in the power window motor 10 for driving the window glass.
[0012]
As shown in FIGS. 4 and 5, the magnet 2 is formed in a cylindrical shape having an outer diameter D1, an inner diameter D2, and a width L1. Sequentially magnetized.
[0013]
A holder insertion portion 2a having an inner diameter D2 is formed on the inner periphery of the magnet 2, and a holder positioning portion 2b formed in a concave shape toward the outside is formed in a part of the holder insertion portion 2a. The holder positioning part 2b has a length L2 in the circumferential direction of the holder insertion part 2a and is recessed from the holder insertion part 2a with a recess dimension L3. The holder insertion part 2 a is inserted into the magnet support part 3 a 2 provided in the holder 3. The holder positioning portion 2 b is used to position the holder 2 so that the magnet 2 does not rotate by being engaged with the magnet positioning portion 3 a 3 provided in the holder 3.
[0014]
As shown in FIG. 7, the holder 3 is formed of a relatively thin plate material having a thickness dimension t1 smaller than the width dimension L1 of the magnet 2 shown in FIG.
[0015]
The holder 3 is provided with a holder main body 3a, a magnet pressing tongue portion 3b, and a magnet contact plate portion 3c.
[0016]
As shown in FIG. 7, the holder main body 3a has a cylindrical shape. As shown in FIG. 6, the holder main body 3a has a power window motor 10 shown in FIG. An armature shaft fitting portion 3a1 having an inner diameter D3 slightly larger than the outer diameter of the armature shaft 11 is formed. The armature shaft fitting portion 3 a 1 is fixed near the commutator 12 on the armature shaft 11 provided in the power window motor 10.
[0017]
As shown in FIG. 6, a magnet support portion 3a2 having an outer diameter D4 smaller than the inner diameter D2 of the holder insertion portion 2a of the magnet 2 is formed on the outer peripheral surface of the holder body 3a. By inserting the holder insertion portion 2a of the magnet 2 into the magnet support portion 3a2, the magnet 2 is supported by the magnet support portion 3a2.
[0018]
And the magnet positioning part 3a3 is formed in a part on the outer periphery periphery of the holder main body 3a. As shown in FIG. 7, the magnet positioning part 3a3 has a width dimension L4 smaller than the width dimension L1 of the magnet 2, and as shown in FIG. 6, the magnet positioning part 3a3 is slightly larger than the length dimension of the holder positioning part 2b of the magnet 2. The projection is formed on the magnet support portion 3a2 with a small length L5 and a projection size L6 slightly smaller than the recess size L3 of the holder positioning portion 2b of the magnet 2.
[0019]
The magnet positioning portion 3a3 is configured such that when the holder insertion portion 2a of the magnet 2 is inserted through the magnet support portion 3a2, the magnet positioning portion 3a3 is inserted into the holder positioning portion 2b of the magnet 2 so that the magnet 2 is brought into a predetermined position with respect to the holder main body 3a. In addition to positioning, it has a function of preventing the magnet 2 from rotating relative to the holder body 3a.
[0020]
As shown in FIG. 2, the magnet pressing tongue pieces 3b are respectively formed at four locations, two on the left and right in the drawing centering on the magnet positioning portion 3a3, and two symmetrical with these two locations. .
[0021]
Each of the magnet pressing tongue pieces 3b is provided with a magnet pressure contact portion 3b1 and a bent portion 3b2.
[0022]
The magnet press-contact portion 3b1 is pressed against the first side wall 2c of the magnet 2 by being bent from one end of the holder main body 3a in the axial direction toward the first side wall 2c of the magnet 2.
[0023]
The bent portion 3b2 is disposed between the magnet pressure contact portion 3b1 and the holder main body 3a, and accumulates an elastic repulsive force for the magnet pressure contact portion 3b1 to press the first side wall 2c side of the magnet 2.
[0024]
The magnet pressing tongue piece portion 3b is a magnet pressing tongue piece portion forming portion 30 that protrudes in the cylindrical direction of the holder main body 3a from one end portion in the axial direction of the holder main body 3a before attaching the magnet shown in FIGS. When the holder insertion portion 2a of the magnet 2 is formed and disposed on the magnet support portion 3a2, the magnet press-contact portion is bent to the first side wall 2c side of the magnet 2 via the bent portion 3b2. 3 b 1 is formed by being elastically pressed against the first side wall 2 c of the magnet 2. Each of the magnet pressing tongue pieces 3b has the bent portion 3b2 and the magnet pressure contact portion 3b1 to direct the magnet 2 in which the holder insertion portion 2a is disposed on the magnet support portion 3a2 of the holder body 3a toward the magnet contact plate portion 3c. Press. The magnet pressing tongue piece 3b is formed in a simple shape at one end of the holder body 3a and elastically pressed against the first side wall 2c of the magnet 2 and is formed by a simple bending process. Therefore, as compared with the conventional case where the adhesive is used, the workability is not accompanied by skill and the workability is remarkably good.
[0025]
The magnet contact plate portion 3c is formed so as to protrude outward from the other end portion in the axial direction of the holder body 3a in a disc shape .
[0026]
As shown in FIG. 6, in the magnet abutting plate portion 3 c, four plate portion main bodies 3 c 1 and four pressing portions 3 c 2 are recessed in the radial direction of the holder 3 in the circumferential direction of the holder main body 3 a . It arrange | positions alternately via the notch part 3c3 . In addition, the four pressing portions 3c2 are formed to have a smaller circumferential length than the four plate portion main bodies 3c1, and have elasticity.
[0027]
Each of the four pressing portions 3c2 is arranged in correspondence with each of the four magnet pressing tongue pieces 3b in the cylindrical direction of the holder body 3a. Each of the pressing portions 3c2 is formed with a bent portion 3c4 between the other end portion in the axial direction of the holder body 3a. The bent portion 3c4 gives an elastic repulsive force to the pressing portion 3c2 to press the magnet pressing tongue piece portion 3b to the side.
[0028]
As shown in FIG. 3, a magnet pressure contact protrusion 3c5 protruding in the shape of a small protrusion on the magnet pressing tongue piece 3b side is formed at substantially the center of the pressing part 3c2. Each of the magnet pressure contact protrusions 3c5 is in pressure contact with the second side wall 2d of the magnet 2, thereby causing the holder insertion portion 2a to move the magnet 2 disposed on the magnet support portion 3a2 of the holder body 3a to the magnet pressing tongue portion 3b. Press to the side. Since the magnet pressure contact protrusion 3c5 is formed in a small protrusion on the pressing portion 3c2, the elastic repulsion force applied to the pressing portion 3c2 from the bent portion 3c4 is concentrated on the second side wall 2d of the magnet 2. Chi also functions to apply to the magnet 2 is locally supported.
[0029]
The sensor magnet device 1 is fitted into each holder positioning portion 2b of the magnet 2 in the magnet pressing tongue portion 3b of the holder 3 formed me by to be bent with respect to the first side wall 2c of the magnet 2 As a result, the magnet 2 is prevented from rotating with respect to the holder body 3a, so that the circumferential displacement of the magnet 2 is prevented.
[0030]
Further, in the sensor magnet device 1, each magnet press contact portion 3b1 of the magnet pressing tongue piece portion 3b of the holder 3 formed by being bent with respect to the first side wall 2c of the magnet 2 causes the magnet 2 to be magnetized. While pressing each toward the contact plate portion 3c, the magnets 2 pressed by the magnet pressing tongue portions 3b of the holder 3 are respectively pressed by the magnet pressure contact protrusions 3c5 formed on the press portions 3c2 of the magnet contact plate portion 3c. The magnet 2 is sandwiched from both sides and fixed to the holder 3 by pressing the magnet pressing tongue pieces 3b facing each other. Therefore, the magnet 2 can be easily fixed without using an adhesive or the like.
[0031]
The sensor magnet device 1 is assembled to a power window motor 10 shown in FIG. The power window motor 10 includes a motor yoke 13, a pair of magnets 14 and 15, an armature 16, a pair of brushes 17 and 18, a gear case 19, a wheel gear 20, and an output shaft 21, and the armature 16 includes an armature shaft. 11, an armature core 22, an armature coil 23, and a commutator 12 are provided.
[0032]
A magnet 14 and a magnet 15 are attached to the inside of the motor yoke 13, and an armature 16 is disposed on the inner peripheral side of both the magnets 14 and 15. The armature shaft 11 provided in the armature 16 includes a first bearing 24 attached to the closed end of the motor yoke 13 and a second shaft attached to the motor yoke 13 side of a shaft hole 19a formed in the gear case 19. A bearing 25 and a third bearing 26 mounted on the opposite side of the shaft hole 19a of the gear case 19 from the motor yoke are rotatably supported.
[0033]
An armature core 22 is fixed substantially at the center of the armature shaft 11, and the commutator 12 is fixed near the armature core 22. The armature coil 23 is wound around the armature core 22 and is electrically connected to the commutator 12. The brushes 17 and 18 are disposed outside the commutator 12 and are pressed against the commutator 12 so as to be electrically connectable. A power window control circuit (not shown) is connected to the brushes 17 and 18.
[0034]
A worm 11 a is formed in the shaft hole 19 a of the gear case 19 in the armature shaft 11, and the worm 11 a meshes with the wheel gear 20. The wheel gear 20 is coupled to an output shaft 21 rotatably supported by the gear case 19 via a damper (not shown). The output shaft 21 is coupled to a window glass (not shown) that is a load.
[0035]
The sensor magnet device 1 is fixed near the commutator 12 on the armature shaft 11. In the vicinity of the sensor magnet device 1, as shown in FIG. 9, two Hall elements 28 and 28 are arranged in a sensor case 19 b formed in the gear case 19. The two Hall elements 28 and 28 are mounted on the substrate 27, and around the substrate 27 and the Hall elements 28 and 28, a filler 29 for waterproofing and insulating the substrate 27 is provided in the sensor case 19b. Is filled. Each of the hall elements 28 is connected to a power window control circuit (not shown).
[0036]
When the power window switch (not shown) is turned on to the open side, and the positive current is supplied to the brushes 17 and 18 from the power window control circuit, the power window motor 10 receives the magnetic force from the armature coil 23 through the commutator 12. And the armature shaft 11 rotates forward by the magnetic force generated by the armature coil 23 and the magnetic force generated by the magnets 14 and 15. When the armature shaft 11 rotates forward, the wheel gear 20 rotates forward via the worm 11a, and when the output shaft 21 rotates forward, the window glass moves downward. At this time, when the armature shaft 11 rotates in the forward direction, the sensor magnet device 1 also rotates in the forward direction together with the armature shaft 11, and magnetic force is applied from the magnet 2 to each Hall element 28. When the voltage is generated and the Hall voltage generated by the Hall element 28 is taken into the power window control circuit, the number of rotations of the armature shaft 11 in the positive direction is counted and stored.
[0037]
When the wind glass reaches the fully open position and the window glass collides with the vehicle body and is prevented from moving, the forward rotation of the armature shaft 11 is restricted. Then, since the sensor magnet device 1 does not rotate together with the armature shaft 11, no hall voltage is generated from the hall element 28, and the power window control circuit cuts off the current supply to the brushes 17 and 18 of the power window motor 10.
[0038]
When a current in the reverse direction is supplied from the power window control circuit to the brushes 17 and 18 by turning on a power window switch (not shown) when the window glass reaches the fully open position, In the wind motor 10, the armature shaft 11 rotates in the reverse direction. When the armature shaft 11 rotates reversely, the wheel gear 20 rotates reversely via the worm 11a, and when the output shaft 21 rotates reversely, the window glass moves upward. At this time, when the armature shaft 11 rotates in the reverse direction, the sensor magnet device 1 also rotates in the reverse direction together with the armature shaft 11, and a magnetic force is applied from the magnet 2 to each Hall element 28. When a voltage is generated and the Hall voltage generated by the Hall element 28 is taken into the power window control circuit, the number of rotations in the reverse direction of the armature shaft 11 is counted and stored.
[0039]
When the wind glass reaches the fully closed position and the window glass collides with the vehicle body and is prevented from moving, the reverse rotation of the armature shaft 11 is restricted. Then, since the sensor magnet device 1 does not rotate together with the armature shaft 11, the Hall voltage from the Hall element 28 is not taken into the power window control circuit, and the power window control circuit supplies current to the brushes 17 and 18 of the power window motor 10. Cut off. At this time, the current supply cut by the power window control circuit is performed after the window glass reaches the fully closed position. Therefore, even after the movement of the window glass is prevented, the armature shaft 11 continues to rotate and passes through the damper. As the output shaft 21 continues to rotate, the window glass is pressed against the vehicle body and closed.
[0040]
In the sensor magnet device 1 that rotates together with the armature shaft 11 , the magnet 2 is prevented from rotating with respect to the holder body 3a by the magnet positioning portion 3a3 of the holder 3 as described above . The magnet 2 is elastically pressed by bending a magnet pressing tongue piece 3b formed at one end in the axial direction of the holder 3, and is applied to the magnet contact plate at the other axial end of the holder body 3a. the four pressing portions having elasticity disposed alternately through 4 horn plate body 3c1 and the notch portion 3c3 in the circumferential direction is formed. Therefore, when the magnet pressing tongue portion is bent, the second side wall 2d of the magnet 2 is supported by the plate body 3c1 to be positioned in the axial direction, and the magnet is formed to protrude from the pressing portion 3c2. When the magnet 2 is sandwiched from both sides by being locally press-contacted to the press-contact protrusion 3c5, the magnet 2 is elastically firmly fixed to the holder 3 without causing play, and is supported without displacement. Furthermore, the magnet 2 is fixed easily and reliably without using an adhesive or the like.
[0041]
【The invention's effect】
As described above, according to the sensor magnet device of the motor according to claim 1 of the present invention, the cylindrical magnet bends the magnet pressing tongue piece formed at one end portion in the axial direction of the holder body. The magnet contact plate at the other end in the axial direction of the holder main body is elastically pressed by the plurality of pressing portions having elasticity arranged alternately with the plurality of plate main bodies and the notches in the circumferential direction. Therefore, when the magnet pressing tongue piece is bent, the side surface of the magnet is supported by each plate body, and is positioned in the axial direction. By being pressed into contact with the part locally, the magnet is elastically and firmly fixed without any play in the holder. In addition, since the magnet pressing tongue piece of the holder body is formed in a simple shape on the holder body, the holder can be easily formed.
[0042]
According to the sensor magnet device of the motor according to the second aspect, the magnet is prevented from rotating by the holder when the holder positioning portion of the holder insertion portion is fitted to the magnet positioning portion of the holder. Therefore, in addition to the effect of the first aspect, since the magnet is prevented from rotating, there is an excellent effect that the magnet is securely fixed to the holder by preventing the circumferential displacement .
[Brief description of the drawings]
FIG. 1 is an external perspective view of a sensor magnet device for a motor according to the present invention.
FIG. 2 is a front view of the sensor magnet device of the motor shown in FIG.
3 is a longitudinal side view of the sensor magnet device of the motor shown in FIG. 1. FIG.
4 is a single front view of a magnet used in the sensor magnet device of the motor shown in FIG. 1. FIG.
5 is a longitudinal sectional view of the magnet shown in FIG.
6 is a single front view of a holder used in the sensor magnet device of the motor shown in FIG. 1. FIG.
7 is a longitudinal sectional view of the holder shown in FIG. 6. FIG.
FIG. 8 is a longitudinal front view of a motor in which the sensor magnet device of the motor shown in FIG. 1 is used.
9 is a sectional view around the sensor magnet device in the motor shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Motor sensor magnet apparatus 2 Magnet 2a Holder insertion part 2b Holder positioning part 2c (One side wall) First side wall 2d (Other side wall) Second side wall 3 Holder 3a Holder body 3a1 Armature shaft fitting part 3a2 Magnet support Part 3a3 Magnet positioning part 3b Magnet pressing tongue part 3b1 Magnet pressure contact part 3c Magnet contact plate part 3c2 Press part 3c5 Magnet pressure contact protrusion 10 (Motor) Power window motor 11 Armature shaft 16 Armature 28 (Rotation detection element) Hall element

Claims (2)

A magnet having a cylindrical shape, with having an armature shaft fitting portion fitted to the armature shaft with the armature of the motor, and a holder with a magnet supporting portion before Symbol magnet is inserted and supported, together with the armature shaft by rotating, a sensor magnet apparatus for a motor which gives a magnetic force against the rotation detecting element, the prior SL holder, is formed on one end portion in the axial direction of the holder body magnet support portion is formed the magnet support a resiliently depressible magnet pressing tongue piece the magnet by that bent against supported magnet part is formed in the other end portion in the axial direction of the holder body can come into contact with the magnet A disc-shaped magnet contact plate portion, and the magnet contact plate portion includes A plurality of plate main bodies formed in the circumferential direction of the contact plate and holding the magnet pressed by the magnet pressing tongue piece and positioning in the axial direction, and more circumferential than the plate main body A plurality of pressing portions that are elastic and hold the magnet pressed by the magnet pressing tongue piece portion toward the magnet pressing tongue piece portion on the radial direction side of the holder. The plurality of pressing portions are alternately provided with magnet press contact protrusions that locally hold the magnet pressed by the magnet pressing tongue piece portion through the recessed cutout portions. A sensor magnet device for a motor. The magnet has a holder insertion part supported by the magnet support part of the holder, and a holder positioning part that has a predetermined width dimension from the holder insertion part in the radial direction and is recessed in an arc shape. A magnet positioning part that protrudes in an arc shape with a predetermined width dimension that prevents the magnet from rotating by being fitted to the holder positioning part of the magnet is supported on a part of the outer circumference of the holder body. The sensor magnet device for a motor according to claim 1, wherein the sensor magnet device is formed on a portion .

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