JP2009240083A - Geared motor with position detection sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geared motor with a position detection sensor, in which a sensor magnet and a final speed change gear can be protected from creep phenomenon due to changes with time, and which can be readily fixed, regardless of the capability of a worker, without using an adhesive and without affecting the magnetic force of a surface which is utilized as a sensor magnet. <P>SOLUTION: The geared motor with the position detection sensor includes: a geared motor body 2; an output shaft, protruding to the outer side than a gear box of this geared motor; the final speed change gear 8, formed by a magnetic material and fixed to a part positioned within the gear box of this output shaft; and the sensor magnet 11, fixed to a side surface of this final-speed change gear. In this geared motor, there is provided a positioning means for preventing the rotation of the sensor magnet and the final speed change gear, and a suction fixing magnetized surface, formed on the surface in contact with the final speed change gear of the sensor magnet for fixing the sensor magnet and the final speed change gear. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a geared motor with a position detection sensor.

A geared motor with a position detection sensor requires a sensor magnet to be placed on the upper surface of the final sintered transmission gear due to the structure of the motor. However, in order to form an integral unit, a high degree of dimensional accuracy of the final sintered transmission gear is required. , Could not be realized.
Therefore, a fixing method using two parts, the sensor magnet and the final sintered transmission gear, is required. However, in the method in which a boss is provided on the sensor magnet or the final sintered transmission gear, This causes a creep phenomenon due to a change with time, and there is a drawback that the sensor magnet may come off due to a decrease in fixing strength.
Further, in the case of fixing by bonding, an adhesive may flow out to the tooth surface of the final sintered transmission gear due to an operation error, which is not realistic.
Furthermore, the conventional method of fixing the sensor magnet by press-fitting into the D-cut provided on the output shaft has a drawback that the press-fitting accuracy depends on the ability of the operator.
nothing special

    In view of the above-mentioned conventional drawbacks, the present invention can prevent the creep phenomenon due to aging of the sensor magnet and the final transmission gear, and influence the magnetic force of the surface used as the sensor magnet without using an adhesive. It is an object of the present invention to provide a geared motor with a position detection sensor that can be easily fixed regardless of the operator's ability.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

To achieve the above object, the present invention provides a geared motor main body, an output shaft projecting outward from the gear box of the geared motor main body, and a magnetic member fixed to a portion of the output shaft located in the gear box. Positioning means for preventing rotation of the sensor magnet and the final transmission gear in a geared motor with a position detection sensor including a final transmission gear formed of a material and a sensor magnet fixed to a side surface of the final transmission gear And a stationary fixed magnetized surface formed on a surface of the sensor magnet that contacts the final transmission gear for fixing the final transmission gear to form a geared motor with a position detection sensor.

  The present invention provides a geared motor main body, an output shaft projecting outward from a gear box of the geared motor main body, and a final material formed of a magnetic material fixed to a portion of the output shaft located in the gear box. In a geared motor with a position detection sensor comprising a transmission gear and a sensor magnet fixed to a side surface of the final transmission gear, positioning means for preventing rotation of the sensor magnet and the final transmission gear, the sensor magnet, and the A geared motor with a position detection sensor is configured by providing an attracting and fixing magnetized surface formed by surface magnetization on the surface of the sensor magnet that contacts the final transmission gear for fixing the final transmission gear.

  In the present invention, the surface magnetization of the sensor magnet formed on the surface in contact with the final transmission gear is such that it can be fixed to the final transmission gear within a range that does not affect the magnetic force of the surface used as a sensor. A geared motor with a position detection sensor is configured as a feature.

  The present invention constitutes a geared motor with a position detection sensor, characterized in that the surface magnetization of the sensor magnet is formed at least two poles or more around the circumference.

  The present invention constitutes a geared motor with a position detection sensor, characterized in that the surface magnetization of the sensor magnet is at least two poles or more on the plane.

  As is clear from the above description, the present invention has the following effects.

(1) The final shift formed of a geared motor main body, an output shaft projecting outward from the gear box of the geared motor main body, and a magnetic material fixed to a portion of the output shaft located in the gear box. In a geared motor with a position detection sensor including a gear and a sensor magnet fixed to a side surface of the final transmission gear, positioning means for preventing rotation of the sensor magnet and the final transmission gear, the sensor magnet, and the final In order to fix the speed change gear of the sensor magnet, a suction fixed magnetized surface formed on the surface in contact with the final speed change gear of the sensor magnet is provided. It is performed by the adsorption fixed magnetized surface on the surface in contact with the transmission gear, and the rotation direction is designed to prevent rotation. It can be carried out by determining means.
Accordingly, there is no creep phenomenon due to secular change in the fixed state, and there is no outflow of the adhesive as in the case of using the adhesive, and the fixing can be ensured.

(2) According to (1) above, the attracting fixed magnetized surface formed on the sensor magnet may be magnetized so that the sensor magnet and the final transmission gear can be attracted, and this affects the magnetic force of the surface used as the sensor magnet sensor. It can be used even in a range that does not call.

(3) According to the above (1), it is possible to accurately fix the surface direction and the rotation direction in a short time regardless of the ability of the operator.

(4) In claim 2, the same effects as in the above (1) to (3) can be obtained, and an optimum final transmission gear and a surface magnetized sensor magnet that can be attracted can be used.

(5) Claims 3, 4, and 5 can provide the same effects as the above (1) to (4), and can efficiently attract and fix the sensor magnet and the final transmission gear even with small magnetization.

  Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the invention shown in the drawings.

  In the first preferred embodiment for carrying out the present invention shown in FIGS. 1 to 7, reference numeral 1 denotes a geared motor with a position detection sensor. The geared motor 1 with a position detection sensor includes a geared motor main body 2 and the geared motor. The gear box 5 attached to the case 4 of the geared motor main body 2 and the drive shaft 3 located in the gear box 5 are arranged at different eccentric positions so as to cover the portion where the drive shaft 3 of the main body 2 protrudes. An output shaft 6 projecting outward from the gear box 5, a final transmission gear 8 made of a magnetic material fixed to the output shaft 6 located in the gear box 5, and the final transmission. A sensor magnet 11 whose surface fixed in a positioning state on the outer surface of the gear 8 is axially magnetized to the S or N pole, and the outer surface of the final transmission gear 8 It is formed on a part of the outer peripheral part of the sensor magnet 11 that can be engaged with the protruding piece 9 to prevent rotation by integrally forming the protruding piece 9 so as to protrude outward at a portion near the outer peripheral part. Positioning means 16 comprising a notch 10 and an N-pole or S-pole formed on the back surface of the sensor magnet 11 in contact with the final transmission gear 8 for fixing the sensor magnet 11 and the final transmission gear 8. Are attached to the portion of the substrate 12 that can detect the steep magnetic flux waveform 13 generated at the notch 10 portion of the sensor magnet 11 and the substrate 12 attached to the outer surface of the gear box 5. And a plurality of transmission gears 15, 15 A, 15 B for transmitting the drive of the drive shaft 3 to the final transmission gear 8 of the output shaft 6. 15C, is composed of a 15D.

The geared motor 1 with a position detection sensor having the above-described configuration incorporates the positions of the plurality of transmission gears 15, 15A, 15B, 15C, and 15D and the final transmission gear 8 in accordance with the reference excitation phase, so that the reference excitation phase and the sensor signal are incorporated. The origin position of the output shaft 6 can be controlled by AND.
In the geared motor 1 with the position detection sensor assembled in this way, the rotation of the drive shaft 3 of the geared motor main body 2 is output via the plurality of transmission gears 15, 15 A, 15 B, 15 C, 15 D and the final transmission gear 8. It is transmitted to the shaft 6 and rotates.
With the rotation of the final transmission gear 8 that rotates the output shaft 6, the sensor magnet 11 having the cutout portion 10 in which the projecting piece 9 of the final transmission gear 8 is inserted also rotates integrally with the sensor magnet 11. When the steep magnetic flux waveform 13 generated between the notches 10 passes through a portion where the magnetic sensor 14 using the Hall IC is located, a dimensional error between the protruding piece 9 and the magnetic sensor 14 occurs. In addition, the position of the output shaft 6 can be reliably detected.
[Different forms for carrying out the invention]

  Next, different modes for carrying out the present invention shown in FIGS. 8 to 28 will be described. In the description of these different modes for carrying out the present invention, the same components as those in the best mode for carrying out the present invention are designated by the same reference numerals and redundant description is omitted. To do.

  The second embodiment for carrying out the present invention shown in FIGS. 8 to 11 is mainly different from the best first embodiment for carrying out the present invention in that the final transmission gear 8 protrudes on the back surface. The positioning means 16A having a notch 10A into which the piece 9 is inserted is used, and a sensor is provided on the surface with a circumferential part different from the notch 10A or the same part, in this embodiment a different circumferential part. In this embodiment, a sensor magnet 11A that is magnetized with two poles so that the N pole is located across the S pole with a small width dimension is used, and the circumferential two poles such as 11H are magnetized on the back of the magnet. By using the sensor magnet 11A, since the S pole and N pole in the same plane are short-circuited at the shortest distance, it becomes possible to greatly reduce the influence of the magnetic force of the adsorption fixed magnetized surface on the sensing surface, By using the sensor magnet such as, similar effects as best first mode for carrying out the present invention is obtained.

  The third embodiment for carrying out the present invention shown in FIGS. 12 to 14 is mainly different from the second embodiment for carrying out the present invention in that the projecting piece 9 of the final transmission gear 8 is provided on the back surface. The positioning means 16B in which the circular notch 10B to be inserted is formed is used, and the S pole having a small width dimension is sandwiched on the circumferential portion different from the notch 10B on the surface. The present invention is applied to the geared motor 1B with a position detection sensor using the positioning means 16B and the sensor magnet 11B in that the sensor magnet 11B magnetized in two poles so that the N pole is located is used. The same effects as those of the second embodiment for implementation can be obtained.

  The fourth embodiment for carrying out the present invention shown in FIGS. 15 to 17 is mainly different from the third embodiment for carrying out the present invention in that the projecting piece 9 of the final transmission gear 8 is provided on the rear surface. The positioning means 16C having the truncated cone-shaped notch 10C to be inserted is used, and a small width dimension is used in the present embodiment for the sensor at a circumferential portion different from the truncated cone-shaped notch 10C on the surface. A geared motor 1C with a position detection sensor using such a positioning means 16C and the sensor magnet 11C is used in that a sensor magnet 11C magnetized in two poles so that the N pole is located across the S pole is used. In addition, the same effects as the third embodiment for carrying out the present invention can be obtained.

  The fifth embodiment for carrying out the present invention shown in FIGS. 18 to 20 is mainly different from the best first embodiment for carrying out the present invention in the notch 10 in the surface portion. A geared motor with a position detection sensor using such a sensor magnet 11D is used in that a sensor magnet 11D is used in which an axially magnetized sensing magnet 18 is pushed so that the magnetic poles on the surface (sensing surface) are different. Even if it is 1D, the same effect as the best first embodiment for carrying out the present invention can be obtained.

  The sixth embodiment for carrying out the present invention shown in FIG. 21 to FIG. 23 is mainly different from the second embodiment for carrying out the present invention in that the surface on the magnet back surface (attraction fixed magnetized surface). Even when such a sensor magnet 11E is used, the best first for carrying out the present invention is that a sensor magnet having S and N poles surface-magnetized so as to divide into two equal parts is used. The same effect as that of the embodiment can be obtained.

  The seventh embodiment for carrying out the present invention shown in FIGS. 24 to 26 is mainly different from the second embodiment for carrying out the present invention in that the S pole and the S pole, and the N pole and the N pole. A geared motor with a position detection sensor constructed using such a sensor magnet 11F is used in that a sensor magnet 11F having a belt-like magnetic pole S and N poles with small width dimensions is used in the middle part of the sensor magnet 11F. Even if it is 1F, the same effect as the second embodiment for carrying out the present invention can be obtained, and a portion where a steep magnetic flux change is caused by the strip-shaped different polarity S pole and N pole, and a slow magnetic flux This can be dealt with by setting a threshold value for the amplitude of the magnetic flux divided into locations where the change occurs.

  The surface magnetization of the N pole or S pole of the adsorption fixed magnetized surface on the back surface of the sensor magnet 11 affects the magnetic force magnetized to the S pole or N pole of the surface (sensing surface) used as the surface sensor. As long as it does not extend, it can be magnetized in various patterns other than the concentric circle shape and the half-divided bisection shown here.

  The present invention is used in the industry of manufacturing a gear motor with a position detection sensor.

The partially broken front view of the best 1st form for implementing this invention. The left view of the best 1st form for implementing this invention. Explanatory drawing of the last transmission gear of the best 1st form for implementing this invention. The bottom view of the sensor magnet of the best 1st form for implementing this invention. The top view of the assembly | attachment state of the last transmission gearwheel and a sensor magnet. The side view of the assembly state of the final transmission gear and a sensor magnet. Explanatory drawing of the magnetic flux waveform of the best 1st form for implementing this invention. The partially broken front view of the 2nd form for implementing this invention. The top view of the sensor magnet of the 2nd form for carrying out the present invention. The bottom view of the sensor magnet of the 2nd form for carrying out the present invention. The expanded sectional view of the 11-11 line of FIG. The partially broken front view of the 3rd form for carrying out the present invention. The top view of the sensor magnet of the 3rd form for carrying out the present invention. FIG. 14 is an enlarged cross-sectional view taken along line 14-14 in FIG. 13. The partially broken front view of the 4th form for carrying out the present invention. The top view of the sensor magnet of the 4th form for carrying out the present invention. FIG. 17 is an enlarged cross-sectional view taken along line 17-17 in FIG. The partially broken front view of the 5th form for carrying out the present invention. The top view of the sensor magnet of the 5th form for carrying out the present invention. FIG. 20 is an enlarged sectional view taken along line 20-20 in FIG. 19; The partially broken front view of the 6th form for carrying out the present invention. The bottom view of the sensor magnet of the 6th form for carrying out the present invention. FIG. 23 is an enlarged sectional view taken along line 23-23 in FIG. 22; The partially broken front view of the 7th form for carrying out the present invention. The top view of the sensor magnet of the 7th form for carrying out the present invention. FIG. 26 is an enlarged sectional view taken along line 26-26 in FIG.

Explanation of symbols

1, 1A-1F: Geared motor with position detection sensor,
2: Geared motor body, 3: Drive shaft,
4: Case, 5: Gearbox,
6: Output shaft, 8: Final transmission gear,
9: Projection piece
10, 10A, 10B, 10C: notch,
11, 11A-11F: sensor magnet,
12: substrate, 13: magnetic flux waveform,
14: Magnetic sensor
15, 15A, 15B, 15C, 15D: transmission gears,
16, 16A, 16B, 16C: positioning means,
17: adsorption fixed magnetized surface,
18: Sensing magnet.

Claims (5)

  A geared motor main body, an output shaft projecting outward from the gear box of the geared motor main body, and a final transmission gear formed of a magnetic material fixed to a portion of the output shaft located in the gear box; In a geared motor with a position detection sensor including a sensor magnet fixed to a side surface of the final transmission gear, positioning means for preventing rotation of the sensor magnet and the final transmission gear, the sensor magnet, and the final transmission gear A geared motor with a position detection sensor, comprising an adsorption fixed magnetized surface formed on a surface of the sensor magnet that contacts the final transmission gear.   A geared motor main body, an output shaft projecting outward from the gear box of the geared motor main body, and a final transmission gear formed of a magnetic material fixed to a portion of the output shaft located in the gear box; In a geared motor with a position detection sensor including a sensor magnet fixed to a side surface of the final transmission gear, positioning means for preventing rotation of the sensor magnet and the final transmission gear, the sensor magnet, and the final transmission gear A geared motor with a position detection sensor, characterized in that an adsorption fixed magnetized surface formed by surface magnetization is provided on a surface of the sensor magnet that contacts the final transmission gear.   The surface magnetization of the sensor magnet formed on the surface in contact with the final transmission gear is characterized in that it can be fixed to the final transmission gear within a range that does not affect the magnetic force of the surface used as a sensor. A geared motor with a position detection sensor according to claim 2.   4. A geared motor with a position detection sensor according to claim 2, wherein the surface magnetization of the sensor magnet is at least two poles or more on the circumference.   The geared motor with a position detection sensor according to any one of claims 2 to 4, wherein the surface magnetization of the sensor magnet is formed on at least two poles in a plane.

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