KR100867275B1 - Pinion-integrated type motor - Google Patents

Abstract

It is possible to prevent and reduce deformation due to heat treatment of the motor shaft, to prevent vibration and noise accompanying the rotation of the pinion integrated motor, and to shorten the delivery time.

The motor shaft 104 in which the pinion 112 is directly cut and integrally formed, the rotor yoke 140 made rotatable integrally with the motor shaft 104, and the permanent magnet 144 fixed to the rotor yoke 140 are provided. ) And the cylindrical stator yoke 148 and the stator yoke 148 that are provided with respect to the permanent magnet 144 via a predetermined gap G1 in the radial direction of the motor shaft 104. A pinion-integrated motor, comprising a plurality of armature coils fixed to an inner circumferential surface and wound in an air core and flat.

Pinion, motor shaft, yoke, permanent magnet, armature coil

Description

Pinion-integrated motor

1 is a front sectional view of a geared motor GM101 which is an example of the embodiment according to the present invention.

2 is a side sectional view of a geared motor GM101 which is an example of the embodiment according to the present invention.

FIG. 3 is a cross-sectional view taken along the arrow III-III line in FIG. 1. FIG.

4 is an overall configuration diagram of an automatic door using a geared motor GM101.

5 is a front sectional view of a hypoid geared motor GM201 described in Patent Document 1. FIG.

6 is a side cross-sectional view of a hypoid geared motor GM201 described in Patent Document 1. FIG.

FIG. 7 is a cross-sectional view taken along the arrow VII-VII line in FIG. 5. FIG.

Explanation of symbols on the main parts of the drawings

GM101: Pinion Integrated Motor

GS: Cartesian Gear Set

102: motor (gap winding type)

104: motor shaft

106, 108, 136, 138: Bearing

112: hypoid pinion

114: output shaft

116: hypoid gear

120: reducer casing

120a: reducer casing body

120b: output shaft cover

122: motor casing

122a: end cover

122b: motor casing body

122c: front cover

124: Bolt

130: reducer

142: armature coil

144: permanent magnet

148: Stator York

150, 152: oil seal

301: Door Drive Belt

302: pulley

303: automatic door (wing)

L1, L2: motor shaft length

The present invention relates to a pinion integrated motor that decelerates and rotates a motor.

Conventionally, the hypoid geared motor GM201 described in FIGS. 5-7 is disclosed (refer patent document 1).

The hypoid geared motor GM201 consists of a motor 202 and a reduction gear 230.

The motor 202 has a motor shaft 204 at its approximately center. This motor shaft 204 is supported by the bearing at two points, and is rotatable with respect to the casing 222. In addition, the permanent magnet 244 is fixed to the motor shaft 204 via the rotor yoke 240 at substantially the center in the axial direction. In addition, the stator yoke 248 is disposed to have a slight gap G2 from the surface of the permanent magnet 244. The stator yoke 248 is fixed to the inner circumferential surface of the casing 222. A plurality of armature coils 242 are wound around the stator yoke 248 in such a manner as to penetrate the inside of the stator yoke 248 in the axial direction (see FIG. 7).

The hypoid pinion 212 is directly cut and formed in the motor shaft 204, and meshes with the hypoid gear 216 provided in the reducer 230. The hypoid gear 216 is attached to the output shaft 214. By engaging the hypoid pinion 212 and the hypoid gear 216, the rotation of the motor shaft 204 is changed in the orthogonal direction and outputted in a decelerated state.

In the geared motor GM201, the hypoid pinion 212 is cut and formed directly on the motor shaft 204 as described above, which reduces the number of parts by forming the pinion directly on the motor shaft, resulting in a low cost (also compact). This is to make it possible to provide a geared motor.

[Patent Document 1] Japanese Patent Publication No. 2004-266980

The motor shaft in which the hypoid pinion is cut directly on such a tip not only serves to extract the rotational force (driving force) of the motor but also has a function as a hypoid pinion. Therefore, a predetermined heat treatment is applied to the motor shaft to withstand the load and wear caused by the meshing.

However, by these heat treatments, deformation such as “warp” due to heat occurs in the motor shaft.

Such deformation of the motor shaft causes irregular rotation of the motor, and causes vibration and noise.

Therefore, when it is applied to the use which requires quietness, for example, for door opening and closing, the process of the process of removing a deformation | transformation (straightening) becomes indispensable. An example of this process is a technique of rotating (rolling) the shaft while applying an appropriate pressure from the radially outer side of the deformed motor shaft. However, since it is not possible to carry out by the general machine in any factory, cost and time are needed, and the problem that cost up and processing time become long has arisen.

The present invention has been made to solve such a problem.

The present invention relates to a motor shaft in which a pinion is directly cut directly, a rotor yoke that is rotatable integrally with the motor shaft, a permanent magnet fixed to the rotor yoke, and the permanent magnet. A cylindrical stator yoke provided in a radial direction via a predetermined gap, and a plurality of armatures fixed to an inner circumferential surface of the stator yoke and wound in an air core and flatly. The above object is solved by configuring a pinion integrated motor to include a coil.

As a result, the thickness of the stator yoke can be suppressed, and the gap between the rotor and the stator can be configured relatively radially outward of the motor shaft. That is, since the position where the magnetic force for rotating the motor shaft is generated is far from the shaft center of the motor shaft, the rotational torque for rotating the motor shaft is increased even with the same magnetic force. In addition, it is also possible to take a large surface area of a permanent magnet, an armature coil, or the like, which generates a magnetic force for rotating the motor shaft. This makes it possible to shorten the length of the rotor and the stator in the axial direction in comparison with a geared motor having the same outer diameter and the same output. As a result, the motor shaft itself can be shortened, and accumulation of heat treatment burden, that is, accumulation of deformation can be reduced. In addition, when the deformation of the motor shaft is reduced, the cause of the occurrence of irregularities in the rotation of the motor is reduced, and thus, noise and vibration during the operation of the geared motor can be prevented. In particular, in a geared motor incorporating a motor and a reducer, when an orthogonal pinion is formed on the motor shaft, such a merit is large because it is likely to cause a large noise from the engagement structure.

EXAMPLE

EMBODIMENT OF THE INVENTION Hereinafter, an example of the Example which concerns on this invention is described in detail using an accompanying drawing.

1 is a front sectional view of a geared motor GM101 which is an example of an embodiment according to the present invention, FIG. 2 is a side sectional view thereof, FIG. 3 is a sectional view taken along the arrow III-III line in FIG. , The overall structure of the automatic door using the geared motor (GM101).

The geared motor GM101 connects the motor 102 and the reduction gear 130. For example, the output shaft 114 of the geared motor GM101 drives the pulley 302, and thus, the door driving belt 301. The automatic door 303 is opened and closed (see FIG. 4). The reduction gear 130 has the orthogonal gear set GS which consists of the hypoid pinion 112 and the hypoid gear 116. FIG.

The motor shaft 104 is disposed in substantially the center of the motor 102. The front end of this motor shaft 104 is rotatably supported by the front cover 122c via the bearing 138. The rear end of the motor shaft 104 is rotatably supported by the end cover 122a by the bearing 136. The front cover 122c and the end cover 122a are integrally connected and fixed by the bolt 124 via the motor casing main body 122b. Moreover, the motor casing 122 is comprised by this front cover 122c, the motor casing main body 122b, and the end cover 122a. The motor casing main body 122b has a cylindrical shape, and a stator yoke 148 is provided around the inner circumferential surface side thereof. In other words, the stator yoke 148 also has a cylindrical shape. In addition, a coil holder 149 is disposed on an inner circumferential surface of the stator yoke 148, and an armature coil wound by an air core and flatly wound on the convex portion formed on the outer circumferential surface of the coil holder 149. A plurality of 142 is fixed. The armature coil 142 is fixed to the inner circumferential surface of the stator yoke 148 in a state where the whole of itself is coated (molded) with insulating resin. In addition, the axial length (inner diameter) d1 of the inner circumference of the armature coil 142 wound flatly at this hollow core is set to be shorter than the axial length W1 of the stator yoke 148. Here, the stator yoke 148 and the armature coil 142 constitute a "stator (stator)".

On the other hand, the rotor yoke 140 is provided in the motor shaft 104 in the substantially center of its own axial direction. The axial length d1 of the inner circumference of the armature coil 142 described above is set to be shorter than the axial length W2 of the rotor yoke 140. In addition, a permanent magnet 144 is disposed on the radially outer side of the rotor yoke 140. In this embodiment, the permanent magnet 144 is disposed so that the polarity is sequentially changed over the circumference of the rotor yoke 140. The permanent magnet 144 is arranged in a form having the armature coil 142 and a slight gap G1. Here, the rotor yoke 140 and the permanent magnet 144 constitute a "rotor".

In addition, the hypoid pinion 112 is cut and formed directly at the tip of the motor shaft 104. The hypoid pinion 112 meshes with the hypoid gear 116 provided in the reducer 130. The hypoid gear 116 is fixedly installed and rotatably integrally with the output shaft 114. Furthermore, the output shaft 114 is rotatably supported by the reducer casing main body 120a via the bearing 106. In addition, the bearing 108 is rotatably supported by the output shaft cover 120b. The output shaft cover 120b is fixed to the reducer casing main body 120a by the bolt 132. The output shaft cover 120b is provided in a state in which the output shaft 114 penetrates a part of the output shaft cover 120b. Moreover, the reducer casing 120 is comprised by this reducer casing main body 120a and the output shaft cover 120b.

Here, in the present embodiment, the front cover 122c constituting the motor casing 122 of the motor 102 and the reducer casing main body 120a constituting the reducer casing 120 of the reducer 130 are integrated. It is formed as an enemy.

Here, reference numerals 150 and 152 denote oil seals.

Next, the operation of the geared motor GM101 will be described.

When the armature coil 142 is energized, a magnetic field is generated in the armature coil 142. The timing, direction, strength, and the like of the current flowing through the armature coil 142 are appropriately controlled by a driver (not shown), and the magnetic field generated by the armature coil 142 and the repulsive action of the permanent magnet 144 ( Hereinafter, the permanent magnet 144 rotates around the motor shaft 104 by means of "field generating means" as a means for generating this action. This rotation is transmitted to the motor shaft 104 via the rotor yoke 140 to rotate the motor shaft 104. Moreover, this rotation rotates the hypoid pinion 112 formed at the tip of the motor shaft 104, and is transmitted to the hypoid gear 116 which meshes with this hypoid pinion 112. The rotation of the motor shaft 104 is decelerated and transmitted to the output shaft 114 by the engagement of the hypoid pinion 112 and the hypoid gear 116. Moreover, by this engagement, the rotational direction is converted into a direction orthogonal to each other.

As described earlier, since the output shaft 114 meshes with the pulley 302, the pulley 302 also rotates with the rotation of the output shaft 114. As the door driving belt 301 rotates by the rotation of the pulley 302, the automatic door connected to the door driving belt 301 is opened and closed.

In the present embodiment, as described in the above-described configuration, the armature coil 142 is formed in a hollow core and flatly wound, and is also fixed to the inner circumferential surface of the stator yoke 148. I am doing it. In other words, this configuration eliminates the need for a space in which the armature coil is wound inside the stator yoke itself as in the prior art, thereby reducing the thickness of the stator yoke 148 itself. As a result, the clearance between the "rotor (rotor)" and "stator (stator)" can be configured more radially outward of the motor shaft 104 as the stator yoke 148 becomes thinner. That is, the position where the rotational force for rotating the motor shaft 104 is far from the shaft center of the motor shaft 104 increases the rotational torque for rotating the motor shaft 104 even if the rotational force itself is the same. Further, the surface area of the field generating means such as the permanent magnet 144 or the armature coil 142 that generates the magnetic force for rotating the motor shaft 104 can be made large. By doing so, it becomes possible to shorten the length of the field generating means in the axial direction. Moreover, since it is an air core coil, the axial length d1 of the inner periphery of the armature coil 142 is larger than the axial lengths W1 and W2 of the rotor yoke 140 and the stator yoke 148. It can be configured shortly. As a result, the axial length (outer diameter) D1 of the outer circumference of the armature coil 142 can also be configured to be shorter than before. That is, the length of the motor shaft 104 itself can be shortened. Here, even in the case of such a configuration, it is possible to ensure an output torque of a degree or higher as in the prior art.

The deformation of the shaft caused by the above-described heat treatment tends to be remarkable as the longer the member (motor shaft) to be treated (more precisely, the larger the total length of the motor shaft divided by the maximum diameter of the motor shaft). Considering the opposite view, if the motor shaft having a shorter shaft length relative to the diameter can be mounted on the motor (for example, a motor shaft whose total length of the motor shaft divided by the maximum diameter of the motor shaft is 6.0 or less), The deformation of the motor shaft accompanying this can be reduced reliably.

If the deformation of the motor shaft accompanying the heat treatment can be reduced, the processing for correcting the deformation (straightening) can be simplified (or omitted), and the cost can be further reduced. At the same time, silence can be maintained.

In particular, when a geared motor is used for opening and closing the door, since the human body passes (positions) near the installation position of the pinion-integrated motor, it is required to have a high level of silence, thereby reducing the occurrence of motor shaft deformation. Preventing vibration and noise by preventing them is extremely effective, and is one of the usage forms in which the effects peculiar to the present invention are best exhibited.

Here, in the above embodiment, the hypoid pinion is employed as the pinion cut directly on the motor shaft, but in addition to that, even if the pinions such as spurs and helical are directly cut and formed, a corresponding effect is obtained.

In addition, the speed reducer does not necessarily need to be 1-stage deceleration, and it is also possible to use a multistage reducer as needed.

[Industry availability]

The present invention has a value of use as a drive source for opening and closing a door. Furthermore, besides this, it must be installed in the vicinity of humans (and animals in general), and therefore, it is highly useful as a driving source requiring low vibration and low noise.

It is possible to mount a motor shaft having a short shaft length, and even in the case where the pinion is cut and formed directly on the motor shaft, the amount of deformation caused by heat treatment can be reduced. In addition, the necessity of a straightening process is reduced, which contributes to shortening the delivery time and cost of the entire geared motor.

Claims (3)

The motor shaft in which the pinion is integrally cut directly, A rotor yoke that is rotatable integrally with the motor shaft; A permanent magnet fixed to the rotor yoke, A cylindrical stator yoke provided in the radial direction of the motor shaft with respect to the permanent magnet via a predetermined gap; A pinion-integrated motor, comprising: a plurality of armature coils fixed to an inner circumferential surface of the stator yoke and wound coaxially and flatly. The method according to claim 1, An axial length of the inner circumference of the armature coil is shorter than the axial length of the stator yoke. The method according to claim 1 or 2, An axial length of the inner circumference of the armature coil is shorter than the axial length of the rotor yoke.

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