JP3758296B2 - Motor equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor device provided with a mechanism for adjusting an axial position of a rotating shaft of a motor.
[0002]
[Prior art]
In a motor equipped with a rotating shaft, a thrust load is applied as the rotating shaft rotates, and the rotating shaft finely moves in the thrust direction. Therefore, a constant load is applied between the rotating shaft and the thrust bearing that supports the rotating shaft. It is in the state. In the motor, energy loss occurs due to a load applied between the rotating shaft and the thrust bearing.
[0003]
Therefore, as shown in FIG. 4, in the motor 100 in which the worm gear 102 is attached to the distal end side of the rotating shaft 101, the proximal end side end portion 101 a of the rotating shaft 101 has a spherical shape, and the proximal end side of the rotating shaft 101. This energy loss is reduced by making point contact of the end portion 101 a with the thrust bearing 103.
[0004]
By the way, the direction of the thrust force applied to the motor 100 is reversed depending on the rotation direction of the rotating shaft 101. That is, the force applied in the direction of the arrow A in FIG. 4 when the rotating shaft 101 rotates in one direction changes the direction of the force in the direction of the arrow B in FIG. 4 when the rotating shaft 101 rotates in the other direction. It will change. Therefore, the energy loss can be suppressed when the rotating shaft 101 is finely moved in the direction of arrow A in FIG. 4 and a load is applied between the proximal end 101a of the rotating shaft 101 and the thrust bearing 103. When the direction is reversed and the rotating shaft 101 is finely moved in the direction of arrow B in FIG. 4, a load is applied between the washer 105 and the radial bearing 106 for suppressing rattling of the rotor 104.
[0005]
Since the washer 105 and the radial bearing 106 are in surface contact with each other, if a load is applied between them, the energy loss increases and the output efficiency of the driving force deteriorates.
[0006]
Depending on the type of the motor 100, there is a structure in which the rotating shaft 101 is pressed in the direction of arrow B in FIG. 4 using a spring material or the like. In a motor having such a structure, the rotating shaft 101 is shown by the arrow in FIG. When finely moving in the B direction, the load between the washer 105 and the radial bearing 106 becomes very large, and the rotating shaft 101 may not rotate at a predetermined voltage.
[0007]
In order to avoid such inconvenience, as shown in FIG. 5, a screw member 107 having a flat tip 107a is arranged on the axis of the rotary shaft 101, and the tip surface 107a of the screw member 107 is set to the rotary shaft. Proposed is a motor device 108 that abuts against the tip 102a of the worm gear 102 attached to the tip side of 101 or the tip 101b of the rotating shaft 101 and presses the rotating shaft 101 with the screw member 107 and the thrust bearing 103. Has been.
[0008]
In this motor device 108, since the rotating shaft 101 is pressed between the screw member 107 and the thrust bearing 103 and rattling of the rotor 104 is suppressed, a washer is unnecessary, and the end face of the rotor 104 and the radial bearing 106 are eliminated. Is in a non-contact state.
[0009]
In the motor device 108, the tip 102a of the worm gear 102 or the tip 101b of the rotating shaft 101 is formed into a spherical shape, and the two are brought into point contact with each other, thereby reducing energy loss due to the thrust load applied to the rotating shaft.
[0010]
The motor device 108 is provided with a screw fixing member 109 having a screw groove 109a formed in front of the motor 100, that is, on the side where the tip of the rotating shaft 101 protrudes. The screw member 107 is fixed on the axis of the rotary shaft 101 by screwing the screw member 107 into a screw groove 109 a formed in the screw fixing member 109.
[0011]
In addition, the motor device 108 fixes the screw member 107 and the fixing member 109 with an adhesive 110 to prevent the screw member 107 from loosening, so that the screw member 107 exerts an optimal urging force on the rotating shaft 101. It is designed to hold the given state.
[0012]
[Problems to be solved by the invention]
However, as described above, the motor device 108 presses the rotating shaft 101 by bringing the tip surface 107a of the screw member 107 into contact with the tip 102a of the worm gear 102 or the tip 101b of the rotating shaft 101. Since it is difficult to adjust the position of the rotary shaft 101 in the axial direction, and the screw member 107 and the fixing member 109 are fixed with an adhesive 110 in order to prevent the screw member 107 from loosening. In the case where the number of points and the number of steps are increased, and it is necessary to adjust the protruding amount of the screw member 107 again after being fixed once, there is a problem that the operation becomes very complicated.
[0013]
Further, since the motor device 108 is configured such that the tip surface 107a of the screw member 107 is brought into contact with the tip 102a of the worm gear 102 or the tip 101b of the rotating shaft 101, it is necessary to attach the screw member 107 with high accuracy. .
[0014]
That is, if a slight error occurs in the mounting position of the screw fixing member 109 that fixes the screw member 107, or if the position or groove angle of the screw groove 109a into which the screw member 107 is screwed is shifted, the tip of the screw member 107 is The surface 107a is displaced from the axis of the rotating shaft 101 and may not come into contact with the tip 102a of the worm gear 102 or the tip 101b of the rotating shaft 101, and the rotating shaft 101 may not be fixed.
[0015]
Therefore, the present invention makes it easy to adjust the axial position of the rotating shaft, minimizes energy loss, and prevents loosening of the screw member without using other fixing means such as an adhesive. It is another object of the present invention to provide a motor device that can relieve the mounting accuracy of the screw member and can appropriately apply a biasing force to the rotating shaft even when the screw member is off the rotation axis of the motor.
[0016]
[Means for Solving the Problems]
In order to achieve the above-described object, the motor device according to the present invention includes a pressing member that is elastically displaced between the rotating shaft of the motor and the adjusting member, and moves the adjusting member forward and backward so that the rotating shaft of the pressing member is moved forward and backward. The pressing position is varied to adjust the position of the rotating shaft in the axial direction.
[0017]
In this motor device, when the adjustment member is pushed into the pressing member, the pressing member is elastically displaced toward the rotating shaft. Then, the elastically displaced pressing plate comes into contact with the tip of the rotating shaft and elastically presses the rotating shaft in the axial direction. At this time, an elastic restoring force acts on the elastically displaced pressing plate. And the looseness of the adjusting member is prevented by the elastic restoring force of the pressing plate.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments to which the present invention is applied will be described below in detail with reference to the drawings.
[0019]
As shown in FIG. 1, a motor 2 used in the motor device 1 includes a substantially cylindrical housing 3, a rotor 5 having a rotating shaft 4 that is rotatably supported in the housing 3, and a housing 3 And a substantially rectangular brush holder 6 disposed on the base end side of the rotating shaft 4.
[0020]
The housing 3 is formed with projecting portions 3a and 3b projecting outward on the bottom surface and the upper surface, respectively, and radial bearings 7 and 8 for rotatably supporting the rotating shaft 4 in the projecting portions 3a and 3b, respectively. Contained. Here, the bottom surface of the housing 3 is a side surface on which the proximal end of the rotating shaft 4 is located, and the upper surface of the housing 3 is a side surface on which the distal end side of the rotating shaft 4 is located. A substantially cylindrical magnet 9 is fixed to the inner peripheral surface of the housing 3.
[0021]
Although not shown, the rotor 5 has a three-pole laminated iron core projecting radially from the rotary shaft 4, three concentrated winding coils wound around the laminated iron core, and the tip of the laminated iron core. And a substantially arc-shaped yoke. Further, three commutators 10 are attached to the rotor 5 on the proximal end side of the rotating shaft 4, and two adjacent coil terminals are electrically connected to each of the three commutators 10. Connected.
[0022]
The rotating shaft 4 has a base end 4 a having a spherical shape, and the base end 4 a abuts against a thrust bearing 11 that is an inner wall surface of the protrusion 3 a on the bottom surface side of the housing 3. ing. The rotating shaft 4 protrudes outward of the housing 3 through a through hole formed at a substantially central portion of the protrusion 3 b on the upper surface side of the housing 3 on the tip 4 b side. A worm gear 12 is attached to the distal end 4 b of the rotating shaft 4 protruding outward from the housing 3. The distal end 12a of the worm gear 12 has a spherical shape like the proximal end 4a of the rotating shaft 4.
[0023]
The brush holder 6 has a pair of brushes 13 and 14 inside. The pair of brushes 13 and 14 are electrically connected to two commutators 10 among the three commutators 10 attached to the rotating shaft 4 of the rotor 5. In addition, a pair of terminal plates 15 and 16 that are electrically connected to one ends of the brushes 13 and 14 are attached to the brush holder 6. The pair of terminal plates 15 and 16 project outside the motor 2 and serve as external terminals.
[0024]
The motor 2 configured as described above is supported between a pair of support plates 18 and 19 formed by cutting and raising the base plate 17, and is fixed on the base plate 17.
[0025]
A pressing plate 20 that is elastically displaceable is provided substantially perpendicular to the axial direction of the rotating shaft 4 in front of the motor 2, that is, on the side from which the tip 4 b of the rotating shaft 4 protrudes. The pressing plate 20 is formed by cutting and raising the base plate 17. The pressing plate 20 has one main surface opposed to the motor 2 as an abutting surface 20a of the worm gear 12 attached to the distal end portion of the rotating shaft 4, and the distal end 12a of the worm gear 12 is formed on the abutting surface 20a. It is in contact. The pressing plate 20 is elastically displaced toward the motor 2 by being pressed by the adjusting member 21, and presses the rotating shaft 4 to which the worm gear 12 is attached in the axial direction.
[0026]
The adjusting member 21 has a spiral thread groove formed on the peripheral surface of the shaft portion, and has a head portion that is rotated by a tool on the proximal end side of the shaft portion. The adjusting member 21 is disposed on or near the axis of the rotating shaft 4, and the tip is in contact with the other main surface 20 b of the pressing plate 20, that is, the back surface of the abutting surface 20 a of the worm gear 12. The adjusting member 21 is supported by a fixing plate 22 disposed on the other main surface 20 b side of the pressing plate 20.
[0027]
Similar to the pressing plate 20, the fixing plate 22 is formed by cutting and raising the base plate 17, and is provided so as to be substantially perpendicular to the axial direction of the rotating shaft 4. The fixing plate 22 has a through hole 23 for locking the adjustment member 21.
[0028]
The through hole 23 has substantially the same diameter as the adjustment member 21, and a screw groove corresponding to the thread of the adjustment member 21 is formed on the hole wall surface. Then, the fixing plate 22 supports the adjusting member 21 while positioning the adjusting member 21 on or near the axis of the rotary shaft 4 by screwing the adjusting member 21 into the through hole 23.
[0029]
In the motor device 1, when the pressing plate 20 is pressed toward the motor 2 by the adjusting member 21, an elastic return force toward the adjusting member 21 acts on the pressing plate 20. And the looseness of the adjustment member 21 is suppressed by this elastic return force.
[0030]
Further, for example, as shown in FIG. 2, the motor device 1 includes a plurality of gears 24, 25, 26 coupled to a worm gear 12 attached to the distal end side of the rotating shaft 4, and the plurality of gears 24, 25, 26, and a lever 27 connected to the worm gear 12 through 26. The motor device 1 drives the motor 2 to rotate the worm gear 12 so that the lever 26 moves linearly.
[0031]
That is, the motor device 1 is provided with a first tooth having teeth that mesh with the teeth of the worm gear 12 when a drive current is supplied to the motor 2 and the worm gear 12 attached to the distal end side of the rotating shaft 4 rotates in one direction. The gear 24 rotates in the direction of arrow A in FIG. When the first gear 24 rotates in the direction of arrow A in FIG. 2, the second gear 25 having teeth meshed with other teeth provided on the first gear 24 is changed to the arrow in FIG. It rotates in the B direction. When the second gear 25 rotates in the direction of arrow B in FIG. 2, the third gear 26 having teeth meshed with other teeth provided on the second gear 25 is moved to the arrow in FIG. Rotate in the C direction.
[0032]
Further, when the third gear 26 rotates in the direction of arrow C in FIG. 2, a lever 27 having teeth meshed with other teeth provided on the third gear 26 in the direction of arrow D in FIG. Move linearly.
[0033]
When the worm gear 12 attached to the tip of the rotating shaft 4 rotates in the other direction, the first gear 24, the second gear 25, and the third gear 26 rotate in the opposite directions, and the lever 27 2 linearly moves in the direction of arrow E in FIG.
[0034]
As described above, the rotation of the worm gear 12 is sequentially transmitted to the first gear 24, the second gear 25, and the third gear 26, and finally converted into a linear motion of the lever 27. Therefore, the motor device 1 can drive the motor 2 to linearly move the lever 27 in the direction of arrow D in FIG. 2 or the direction of arrow E in FIG.
[0035]
The motor device 1 configured as described above is configured by screwing the adjusting member 21 screwed into the through hole 23 of the fixing plate 22 toward the pressing plate 20 and pressing the pressing plate 20 toward the motor 2. The pressing plate 20 is elastically displaced to press the rotary shaft 4 in the axial direction.
[0036]
And this motor apparatus 1 adjusts the position of the axial direction of the rotating shaft 4 when the rotating shaft 4 is pressed to an axial direction. At this time, the end 4a on the base end side of the rotating shaft 4 that contacts the thrust bearing 11 and the tip 12a of the worm gear 12 that contacts one main surface 20a of the pressing plate 20 have a spherical shape. 11 and the end 4a on the base end side of the rotating shaft 4, one main surface 20a of the pressing plate 20, and the tip 12a of the worm gear 12 are in point contact with each other, and energy loss due to a load applied between them is suppressed. be able to.
[0037]
In the motor device 1, when the pressing plate 20 is pressed toward the motor 2 by the adjustment member 21, an elastic restoring force toward the adjustment member 21 is applied to the pressing plate 20. And the looseness of the adjustment member 21 is suppressed by this elastic return force.
[0038]
Further, the motor device 1 is configured such that the tip of the worm gear 12 attached to the tip side of the rotating shaft 4 abuts on the main surface 20 a of the pressing plate 20 provided substantially perpendicular to the axis of the rotating shaft 4. Therefore, even if the adjusting member 21 that presses the pressing plate 20 toward the motor 2 is attached at a position off the axis of the rotating shaft 4, the pressing plate 20 is elastically displaced toward the motor 2 and the rotating shaft 4. It is possible to appropriately adjust the position in the axial direction.
[0039]
Next, the operation of the motor device 1 configured as described above will be described. First, when a drive current is supplied from an external terminal of the motor 2, the drive current is transmitted to the commutator 10 that contacts the brushes 13, 14 through the brushes 13, 14 attached to the brush holder 6. The drive current transmitted to the commutator 10 is alternately supplied to the rotor 5.
[0040]
When the drive current is supplied, the rotor 5 generates a magnetic flux in a direction corresponding to the direction of the drive current, and alternately applies an attractive force and a repulsive force to the magnet 9 attached to the inner wall of the housing 3. To act on. Then, the rotor 5 generates a magnetic thrust by the attractive force and the repulsive force applied to the magnet 9 and rotates about the rotation shaft 4.
[0041]
When the rotor 5 rotates, the worm gear 12 attached to the distal end side of the rotating shaft 4 rotates. The rotation of the worm gear 12 is converted into a linear motion of the lever 27 via the plurality of gears 24, 25, and 26.
[0042]
Here, when the rotor 5 rotates, a thrust load is generated on the rotating shaft 4. However, since the motor device 1 is adjusted in the axial direction of the rotary shaft 4 by the elastic displacement of the pressing plate 20, the load due to this thrust load is reduced and the reduction in output efficiency of the driving force of the motor 2 is suppressed. be able to.
[0043]
Further, in the motor device 1, the base end side end portion 4 a of the rotating shaft 4 and the tip end 12 a of the worm gear 12 attached to the leading end side of the rotating shaft 4 are each spherical, and the rotating shaft 4 is connected to the thrust bearing 11. Since point contact is made with one main surface 20a of the pressing plate 20, energy loss due to a load applied between them can be suppressed.
[0044]
In the motor device 1, when the pressing plate 20 is pressed toward the motor 2 by the adjustment member 21, an elastic restoring force toward the adjustment member 21 is applied to the pressing plate 20. And the looseness of the adjustment member 21 is suppressed by this elastic return force.
[0045]
In the above, the motor device 1 formed by cutting the base plate 17 from the pressing plate 20 and the fixing plate 22 has been described, but the present invention is not limited to this example, and the pressing plate 20 and the fixing plate 22 are fixed. The plates 22 may be formed as separate components, or the pressing plate 20 and the fixing plate 22 may be integrally formed as components and attached to the base plate 17 as shown in FIG.
[0046]
Further, the motor device 1 using the brush motor as the motor 2 has been described above, but the present invention is not limited to this example, and other motors such as a brushless motor can be used as the motor 2. Needless to say.
[0047]
Furthermore, although the above has described the motor device 1 in which the worm gear 12 is attached to the distal end side of the rotating shaft 4 and the distal end 12a of the worm gear 12 is brought into contact with the pressing plate 20, the present invention is limited to this example. Instead, the tip 4b of the rotating shaft 4 may be brought into direct contact with the pressing plate 20. In this case, the same effect as the above-mentioned example can be acquired by making the front-end | tip 4b of a rotating shaft into a spherical shape.
[0048]
【The invention's effect】
The motor device according to the present invention includes a pressing member that is elastically displaceable between the adjustment member and the rotation shaft, and the adjustment member presses the pressing member toward the motor and elastically displaces the pressing member, whereby the pressing member rotates. Since the shaft is pressed in the axial direction to adjust the axial position of the rotating shaft, the load due to the thrust load can be reduced, and the reduction in the output efficiency of the motor driving force can be suppressed and adjusted. Becomes easy.
[0049]
Further, in this motor device, since the tip end portion of the rotating shaft of the motor comes into contact with the main surface of the pressing member orthogonal to the rotating shaft, the adjusting member that biases the pressing member toward the motor side is provided on the rotating shaft line of the motor. Even if it is attached to the position where it has come off, the tip of the rotating shaft of the motor can be appropriately pressed to the motor side.
[0050]
Furthermore, in this motor device, since the elastic restoring force generated when the pressing member is pressed by the adjusting member and elastically displaced toward the motor is applied to the adjusting member, the adjusting member receives the elastic restoring force and is fixed. It will be fixed to the member. Therefore, this motor device does not need to use another fixing means such as an adhesive, and the configuration is simplified and assembly is facilitated.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part showing a motor device according to the present invention.
FIG. 2 is a plan view showing an example using a motor device according to the present invention.
FIG. 3 is a longitudinal sectional view of an essential part showing another example of a motor device according to the present invention.
FIG. 4 is a longitudinal sectional view showing a conventional brush motor.
FIG. 5 is a longitudinal sectional view of a main part showing a conventional motor device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Motor apparatus, 2 Motor, 4 Rotating shaft, 12 Worm gear, 17 Base plate, 20 Press plate, 21 Adjustment member, 22 Fixing plate, 23 Through-hole,

Claims (3)

A motor having a rotating shaft;
An elastically displaceable pressing member disposed substantially orthogonal to the rotating shaft and facing the tip of the rotating shaft;
An adjustment member supported by a fixing member and pressing the pressing member toward the rotating shaft;
A motor device characterized in that by moving the adjusting member back and forth, the pressing position of the rotating shaft by the pressing member is varied to adjust the position of the rotating shaft in the axial direction. The motor device according to claim 1, wherein a worm gear is attached to a tip portion of the rotating shaft, and the pressing member presses the tip of the worm gear. The motor device according to claim 1, wherein the pressing member and the fixing member are formed by cutting and raising a base plate to which the motor is attached.

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