JPH0152985B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thrust direction position adjustment device for an output shaft of a motor.

In general, devices where the position of the motor output shaft has a subtle effect on the characteristics of the device, such as digital
In devices such as audio disk devices that optically detect information engraved on the disk using laser beams, etc., the distance between the disk and the sensor has a subtle effect on the playback characteristics. Therefore, it may be necessary to readjust the placement position of the disk after assembly.

In this case, all you have to do is change the mounting position of the disc attached to the output shaft of the motor or the turntable on which the disc is placed, or change the mounting position of the motor with respect to the device, but in reality, rotating the disc This type of adjustment method is not suitable for practical use because it requires adjustment based on the state.

In addition, the motor bodies are accommodated in a telescopic double cylinder by sliding each other, and the external cylinder is attached to the device side, and the output shaft of the motor is housed in the internal cylinder by sliding the internal cylinder onto the external cylinder. It is also conceivable to adjust the position of the thrust direction. However, the overall dimensions of the motor, particularly in the radial direction, increase, making it unsuitable for small devices.

Furthermore, the rotating shaft of the motor is given a certain backlash (play) in the thrust direction in advance, and the end of the adjusting screw screwed into one end of the frame is used to press the end of the rotating shaft on the side opposite to the output shaft. It has also been considered that the amount of protrusion of the output shaft is adjusted by rotating the adjustment screw.

However, with such a device, the amount of play in the thrust direction changes due to the above adjustment, and in order to set a large adjustment range, the amount of play in the thrust direction that is given to the rotating shaft in advance must also be increased. There were naturally limits to the range of adjustment, such as the need to keep the In addition, since such backlash in the thrust direction must be tolerated, in devices where the distance between the disk and the sensor has a subtle effect on the playback characteristics, such as the digital audio disk device described above, the playback characteristics may be disturbed. Therefore, it was not suitable as a drive motor for this type of device.

The present invention has been made in view of the above circumstances, and its purpose is to adjust the position of the output shaft of the motor in the thrust direction while the motor is rotating.
To provide a thrust direction position adjustment device for an output shaft of a motor that can be adjusted continuously and arbitrarily regardless of whether the motor is stopped and does not affect the electrical characteristics of the motor even when such adjustment is performed. There is a particular thing.

In order to achieve such an object, the present invention is characterized by the following configuration. Note that the numbers in parentheses below after the component names indicate corresponding component numbers in the drawings.

That is, the first device of the present invention includes a frame 3 forming an external case, a cylindrical magnet 7 disposed within the frame 3, and a cylindrical magnet 7 disposed between the magnet 7 and the frame 3 in a non-contact manner. A cylindrical coil 12, an internal pipe 5 disposed in the center hole of the magnet 7, bearing rings 8 and 9 disposed within this internal pipe 5, and rotatably and slidably disposed on these bearing rings 8 and 9. rotation axis 1
0. A rotor holder 11 fixed to the side opposite to the output shaft of the rotating shaft 10 and fixed to one side of the honeycomb coil 12, and a rotor holder 11 fixed to the rotating shaft 10 externally at the center of the side surface of the rotor holder 11. The motor main body 1 includes a commutator 17 and the like fixed in a fixed state, and a bottom wall 23c through which the rotating shaft 10 passes with a play in the center hole.
The first bracket 2 is inserted into the frame 3 through the opening formed on the side opposite to the output shaft.
a bottomed cylindrical second bracket 23 that is screwed together or directly screwed together to move forward and backward in the direction of the motor body 1; and a rotating shaft 10 that protrudes from the bottom wall 23c of the second bracket 23. When the second bracket 23 is retracted, the second bracket 23 is provided at the end opposite to the output shaft.
a retaining means 26, 40 for preventing the rotating shaft 10 from coming out from inside the bracket 23; an adjusting screw 30 that presses and moves the shaft end of the rotating shaft 10 by advancing in the direction of the main body 1; and an adjusting screw 30 provided on the motor main body 1 side of the second bracket 23 and joined to the second bracket 23. Second bracket 23 via brush holding plate 18
The brush holding plate 18 is made to follow the forward and backward movement of the brush holding plate 18, and the brush 19 is attached to the brush holding plate 18 and brought into contact with the commutator 17.

Further, the second device of the present invention includes a frame 3 forming an external case, a cylindrical magnet 7 disposed within the frame 3, and a cylindrical magnet 7 disposed between the magnet 7 and the frame 3 in a non-contact manner. A cylindrical coil 12, an internal pipe 5 disposed in the center hole of the magnet 7, bearing rings 8 and 9 disposed within this internal pipe 5, and rotatably and slidably disposed on these bearing rings 8 and 9. a rotor holder 11 fixed on the side opposite to the output shaft of the rotor shaft 10 and fixed to one side of the coil 12;
The motor main body part 1 includes a commutator 17 and the like fixed in a state where it is externally fitted to the bottom wall part 23c, and a bottom wall part 23c through which the rotating shaft 10 passes through with a play in the center hole. 1
The first bracket 2 is inserted into the frame 3 through the opening formed on the side opposite to the output shaft.
a bottomed cylindrical second bracket 23 that is screwed together or directly screwed together to move forward and backward in the direction of the motor body 1; and a rotating shaft 10 that protrudes from the bottom wall 23c of the second bracket 23. When the second bracket 23 is retracted, the second bracket 23 is provided at the end opposite to the output shaft.
a retaining means 26 for preventing the rotary shaft 10 from coming off from inside the bracket 23; and a pair of sliding members interposed between the retaining means 26 and the bottom wall portion 23c of the second bracket 23. 27, 28; an elastic member 29 which is interposed between the pair of sliding contact members 27, 28; an adjustment screw 30 that presses and moves the shaft end of the rotary shaft 10 by advancing in the direction of the motor body 1; and an adjustment screw 30 provided on the motor body 1 side of the second bracket 23 and connected to the second bracket 23; the second bracket 23 via the brush holding plate 18
The brush holding plate 18 is made to follow the forward and backward movement of the brush holding plate 18, and the brush 19 is attached to the brush holding plate 18 and brought into contact with the commutator 17.

According to these first and second devices, by rotating the second bracket 23 and moving it forward and backward with respect to the frame 3, the position of the output shaft in the thrust direction can be adjusted when the motor is rotating and when it is stopped. Regardless, it can be adjusted continuously and arbitrarily, and the adjustment does not affect the electrical characteristics of the motor.

Further, according to the second device, the retaining means 26
A pair of sliding members 27 and 28 are inserted between the bottom wall portion 23c of the second bracket 23 and an elastic member 29 is sandwiched between the pair of sliding members 27 and 28. Therefore, by keeping the adjusting screw 30 in contact with the shaft end of the rotating shaft 10, the rotating shaft 10
This has the advantage that the occurrence of backlash in the thrust direction can be effectively prevented.

Hereinafter, a first embodiment in which the present invention is applied to a coreless motor will be specifically described with reference to FIGS. 1 to 3.

FIG. 1 is a longitudinal sectional view showing a coreless motor equipped with the present device, in which the motor main body 1 is disposed on the left side, and the present device 2 is disposed on the right side.

Reference numeral 3 designates a cylindrical frame that forms the outer case of the motor body 1, and has openings 3 at both ends thereof.
a and 3b are provided.

Reference numeral 4 denotes a mounting plate that fits into the opening 3a of the frame 3 to close the opening 3a, and one end of the internal pipe 5 is integrally fixed to the center of the mounting plate 4 by insert molding. and the internal pipe 5
Most of it is inserted into the frame 3 along the axial direction of the frame 3. 6 is a resin portion formed by injection molding during the insert molding.

Reference numeral 7 denotes a cylindrical ferrite magnet fitted into the outer periphery of the internal pipe 5, and one end surface of this magnet is joined to the resin part via an adhesive or the like.

Further, bearing rings 8 and 9 are fitted to the inner periphery of both ends of the internal pipe 5, a rotating shaft 10 is inserted into both bearing rings 8 and 9, and one side of this rotating shaft 10 is attached to the mounting plate 4. The rotary shaft 10 that protrudes outward by a certain length is used as an output shaft 10a.

In addition, a rotor holder 11 made of an insulating material is press-fitted into the middle part of the rotating shaft 10, and an adhesive is applied to the outer circumference of the rotor holder 11 to attach an air-core cylindrical coil 12 to one end circumference. The coil 12 is inserted into a gap 14 formed between the outer peripheral surface of the magnet 7 and the inner peripheral surface of the frame 3 in a non-contact manner.

Further, a certain gap 16 is formed between the end face of the boss portion 15 protruding from the center of one side of the rotor holder 11 and the end face of the bearing ring 8, so that the rotation shaft 10 can be moved to the left. is allowed.

Furthermore, a commutator 17 is fixed to the center of the other end surface of the rotor holder 11, and a pair of sliding brushes 19, 1 attached to the brush holding plate 18 are attached to the commutator 17.
The tip of 9 is slid into contact.

By the way, the brush holding plate 18 is a disc-shaped substrate held on the inner periphery of the insertion side opening of the cylindrical first bracket 20 that is fitted into the opening 3b of the frame 3. Four engaging protrusions 2 as shown in FIG. 2 are protruded from the outer periphery at equal intervals, and these engaging protrusions 21 are connected to the insertion side of the first bracket 20 as shown in FIG. 3. The brush holding plate 18 is held movably in the direction of the rotor 13 only by fitting it into four engaging grooves 22 carved in parallel to the axial direction on the inner periphery of the opening. There is.

The first bracket 20 is brought into contact with a stepped portion 1c formed on the inner circumferential portion of the frame 3, and is then crimped and fixed from the outer side of the frame 3.

In this case, by rotating the first bracket 20 in its circumferential direction and rotating the holding plate 18 that is held by the first bracket 20 and rotates together with the bracket 20, Before crimping and fixing the first bracket 20 to the frame 3, it is necessary to adjust the arrangement angle of the sliding brushes 19, 19 with respect to the magnet 7 to ensure an electrical neutral point.

By the way, the reference numeral 23 in the figure is inserted from the opening 3b side of the frame 3 on the side opposite to the output shaft, and is indirectly supported by the frame 3 via the first bracket 20 fixed to the frame 3 side. In the embodiment, the second bracket is a bottomed cylindrical bracket that is screwed onto the inner circumferential portion of the first bracket 20 and is provided so as to be adjustable forward and backward toward the motor main body 1 side. The inner end surface 23a of the second bracket 23 is slidably abutted against the outer end surface 18a of the brush holding plate 18.

Also, the inner end surface 23 of this second bracket 23
The outer end surface 24b of the brush holding plate holder 24, which has a flange 24a that is rotatably fitted into the center of the brush holding plate 18, is attached to the center part of the brush holding plate 18 by screwing, gluing, heat welding, or other known joining means. By rotating the second bracket 23, the brush holding plate 18 is moved forward and backward.

The second bracket 23 is provided with locking holes 25, 25 on its outer end surface 23b, and the tip of a working tool such as a crab-eye wrench can be inserted into the locking holes 25, 2.
5 so that it can be rotated.

Further, reference numeral 26 in the figure is attached to the end of the rotary shaft 10 on the side opposite to the output shaft protruding from the bottom wall portion 23c of the second bracket 23.
This is an E-ring that serves as a means to prevent it from slipping out from inside. A rubber elastic member 29 whose both ends are clamped by a pair of sliding members 27 and 28 is inserted between the E-ring 26 and the bottom wall 23c of the second bracket 23, and one sliding Contact member 2
7 is brought into contact with the bottom wall portion 23c of the second bracket 23, and the other sliding contact member 28 is brought into contact with the bottom wall portion 23c of the second bracket 23.
It is brought into contact with the ring 26.

In this embodiment, as the sliding contact members 27 and 28, two washers stacked one on top of the other are used, and the washers mainly come into sliding contact with each other during rotation of the rotating shaft 10. .

Further, an adjusting screw 30 is screwed onto the inner circumference of the second bracket 23, and the inner end 30a of the adjusting screw 30 presses the end of the rotating shaft 10 on the side opposite to the output shaft in the direction of the rotating shaft. ing.

Note that the above-mentioned slip-off preventing means is not limited to the E-ring 26; for example, a collar may be fitted onto the rotating shaft 10 and the collar may be integrally fixed to the rotating shaft via a screw or the like screwed onto the collar. A stepped portion may be provided on the rotating shaft 10 itself.

According to such a configuration, when the adjusting screw 30 is rotated and the inner end surface 30a presses the rotating shaft 10 in the direction of its output shaft, the elastic member 29 is moved around the E-ring 26 and the rotating shaft 10 that are engaged with the rotating shaft 10. Sliding member 28
The reaction force is applied to the inner end surface 30a of the adjusting screw 30 via the rotating shaft 10.
Therefore, regardless of whether the motor is in operation or stopped, a pressing force acts between the rotating shaft 10 and the adjusting screw 30, so that the rotating shaft 10 separates from the inner end surface 30a of the adjusting screw 30. Therefore, no backlash occurs in the rotating shaft 10 in the thrust direction.

In such a state, the second bracket 23
When the rotating shaft 10, the rotor 13, the commutator 17, the sliding brushes 19, 19, the brush holding plate 18, and other components on the motor body 1 side are rotated, each component on the motor body 1 side maintains a predetermined positional relationship with each other. In order to move forward and backward within the frame 3 together with the second bracket 23 in the state,
The amount of protrusion of the output shaft 10a can be controlled even during operation of the motor without affecting the electrical characteristics of the motor.
In other words, the position of the output shaft 10a in the thrust direction can be adjusted continuously and arbitrarily. Moreover, even with such adjustment, no play in the thrust direction occurs in the rotating shaft 10.

In particular, the commutator 17 is moved by sliding brushes 19, 19.
The brush retaining plate 18 is allowed to move only in the direction of the rotation axis by the first bracket 20 fixed to the frame 3 side. The positional relationship between the child 17 and the sliding brushes 19, 19 is in the thrust direction,
There is no change from the initial setting state in either the radial direction, and there is no problem with the rotation of the motor.

Furthermore, when adjusting the adjusting screw 30, if the elastic member 29 is set to have an appropriate preload applied in advance, the frame 3, rotating shaft 10, etc. will expand due to temperature changes during operation, etc. Alternatively, when contracted, the compressive force on the elastic member 29 changes and the width of the elastic member 29 changes, but the rotating shaft 10 does not separate from the inner end surface 30a of the adjusting screw 30, and the rotating shaft There will be no play in the thrust direction of the rotary shaft 10, or an increase in frictional resistance due to the compressive force in the axial direction acting on the rotating shaft 10, which will prevent the load current from increasing abnormally.

The above is an E provided at the end of the rotating shaft 10 opposite to the output shaft.
Although the embodiment in which the elastic member 29 is inserted between the ring 26 or other retaining means and the bottom wall portion 23c of the second bracket 23 has been described, the present invention also applies to the case where the elastic member 29 is not present. This is applicable and is shown in FIG. 4 as a second embodiment.

That is, an E-ring 40 as a retaining means is engaged with the end of the rotating shaft 10 on the side opposite to the output shaft, and this
Ring 40 and bottom wall 23 of second bracket 23
For example, washers 41, 41 are used as sliding contact members between c.
is inserted. Further, since the other configurations are the same as those of the previous embodiment, the same parts are given the same numbers and the explanation will be omitted.

By the way, in such a configuration, the adjustment screw 3
0 is rotated so that a slight gap 42 is formed between the inner end surface 30a and the rotating shaft 10, and then the second bracket 23 is rotated, so that each of the motor body parts 1 side The inside of the frame 3 is moved together with the second bracket 23 while the constituent members, that is, the rotating shaft 10, the rotor 13, the commutator 17, the sliding brushes 19, 19, the brush holding plate 18, etc., maintain a predetermined positional relationship with each other. Since the output shaft 10a moves forward and backward, the amount of protrusion of the output shaft 10a, that is, the position of the output shaft 10a in the thrust direction, can be continuously adjusted even during operation of the motor without affecting the electrical characteristics of the motor.
and can be adjusted arbitrarily. Moreover, even if such adjustment is made, the amount of play in the thrust direction of the rotating shaft 10 is the initial setting value preset by the adjusting screw 30. A gap 42 set between
It does not change from the value of .

The size of the gap 42 is such that even if the rotating shaft 10, the frame 3, or the like expands or contracts due to temperature changes, the gap will always exist so that the rotating shaft 10 can be adjusted by the inner end surface 30a of the adjusting screw 30. Needless to say, it is set to a value that will not cause any stress.

As explained above, according to the first embodiment, there is no backlash in the thrust direction, and according to the second embodiment, there is no change in the amount of backlash in the thrust direction. The present invention makes it possible to adjust the position of the rotating shaft in the thrust direction without affecting the electrical characteristics of the motor, and regardless of whether the motor is rotating or stopped. , continuously,
And it can be done arbitrarily.

In addition, since this device can be housed within the frame 3,
There is no increase in the outer diameter of the motor, and it is particularly suitable for small devices.

In addition, in the first and second embodiments, the first bracket 20 is provided, and the second bracket 23 is connected to the first bracket 20.
The second bracket 23 is indirectly supported on the frame 3 side via the first bracket 20 by screwing it into the inner peripheral part of the first bracket 20, but this is not necessarily the case. There is no need to provide such a first bracket 20; for example, fitting grooves into which the engaging protrusions 21 provided on the brush holding plate 18 fit are provided on the inner periphery of the frame 3, parallel to the axial direction, and It is also possible to directly support the second bracket 23 on the frame 3 by threading the second bracket 23 onto the inner peripheral portion of the frame 3.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, FIG. 2 is a front view of a brush holding plate of the same embodiment,
FIG. 3 is an end view of the first bracket of the same embodiment, and FIG. 4 is a longitudinal sectional view showing the second embodiment of the present invention. 1...Motor main body, 3...Frame, 10...
...Rotating shaft, 10a... Output shaft, 20... First bracket, 23... Second bracket, 26...
Retaining means (E ring), 27, 28...Sliding member (washier), 29...Elastic member, 30...
Adjustment screw.

Claims (1)

[Scope of Claims] 1. A frame 3 forming an external case, a cylindrical magnet 7 disposed within the frame 3, and a cylindrical coil disposed between the magnet 7 and the frame 3 in a non-contact manner. 12. An internal pipe 5 disposed in the center hole of the magnet 7, bearing rings 8 and 9 disposed within the internal pipe 5, and a rotating shaft 10 rotatably and slidably disposed in the bearing rings 8 and 9. , a rotor holder 11 fixed to the side opposite to the output shaft of the rotating shaft 10 and fixed to one side of the coil 12; and a state in which the rotor holder 11 is fitted onto the center of the side surface of the rotor holder 11 and fixed to the outer side of the rotating shaft 10. A motor main body 1 including a commutator 17 fixed to
and the bottom wall portion 23c, through which the rotating shaft 10 passes with a play in the center hole, is attached to the motor main body portion 1.
The first bracket 2 is inserted into the frame 3 through the opening formed on the side opposite to the output shaft.
a bottomed cylindrical second bracket 23 that is screwed together or directly screwed together to move forward and backward in the direction of the motor body 1; and a rotating shaft 10 that protrudes from the bottom wall 23c of the second bracket 23. When the second bracket 23 is retracted, the second bracket 23 is provided at the end opposite to the output shaft.
a retaining means 26, 40 for preventing the rotating shaft 10 from coming out from inside the bracket 23; an adjusting screw 30 that presses and moves the shaft end of the rotating shaft 10 by advancing in the direction of the main body 1; and an adjusting screw 30 provided on the motor main body 1 side of the second bracket 23 and joined to the second bracket 23. Second bracket 23 via brush holding plate 18
A brush 19 that is attached to the brush holder plate 18 and brought into contact with the commutator 17. A brush 19 that is attached to the brush holder plate 18 and brought into contact with the commutator 17. 2. A frame 3 forming an external case, a cylindrical magnet 7 disposed within this frame 3, a cylindrical coil 12 disposed in a non-contact state between this magnet 7 and the frame 3, and a cylindrical coil 12 disposed in a non-contact state between the magnet 7 and the frame 3. An internal pipe 5 disposed in the center hole, bearing rings 8 and 9 disposed within the internal pipe 5, a rotating shaft 10 rotatably and slidably disposed in the bearing rings 8 and 9, and A rotor holder 11 is fixed on the side opposite to the output shaft and fixed to one side of the coil 12, and a commutator 17 is fixed to the central part of the side surface of the rotor holder 11 in a state where it is externally fitted and fixed to the rotating shaft 10. etc., and a bottom wall portion 23c through which the rotating shaft 10 passes with a play in the center hole.
The first bracket 2 is inserted into the frame 3 through the opening formed on the side opposite to the output shaft.
a bottomed cylindrical second bracket 23 that is screwed together or directly screwed together to move forward and backward in the direction of the motor body 1; and a rotating shaft 10 that protrudes from the bottom wall 23c of the second bracket 23. When the second bracket 23 is retracted, the second bracket 23 is provided at the end opposite to the output shaft.
a retaining means 26 for preventing the rotary shaft 10 from coming off from inside the bracket 23; and a pair of sliding members inserted between the retaining means 26 and the bottom wall portion 23c of the second bracket 23. 27, 28; an elastic member 29 which is interposed between the pair of sliding contact members 27, 28; an adjustment screw 30 that presses and moves the shaft end of the rotary shaft 10 by advancing in the direction of the motor body 1; and an adjustment screw 30 that is provided on the motor body 1 side of the second bracket 23 and is connected to the second bracket 23; the second bracket 23 via the brush holding plate 18
A thrust direction position adjustment device for an output shaft of a motor, comprising: a brush holding plate 18 that follows the forward and backward movements of the motor; and a brush 19 that is attached to the brush holding plate 18 and brought into contact with the commutator 17.