JPH04111267U - Motor rotation shaft support structure - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a support structure for a rotating shaft of a motor that does not generate cogging noise when the motor is driven. [Structure] The rotating shaft 34 of the motor 4 is supported with a minute clearance between the inner circumferential wall 4b of a bearing 4a made of oil-less metal, and supported by the elastic arm 51b of a spring 51 fixed to the second wheel 39. Then, a protrusion 35a protruding from one surface of the first worm 35 fixed to the rotating shaft 34 is pressed,
The elastic arm 51b biases the rotary shaft 34 in a diagonal direction with respect to the axis, so that the rotary shaft 34 is brought into contact with the inner circumferential wall 4b of the bearing 4.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention eliminates the abnormal noise called cogging noise that occurs when the motor rotates. This invention relates to a support structure for a rotating shaft of a motor.

0002

[Conventional technology]

Traditionally, motors used as drive sources to rotate pulleys and gears have a rotating shaft. Bearings made of oil-free metal are used as supporting bearings.

0003

[Problem that the idea aims to solve]

By the way, the above motor requires a small clearance between the bearing and the rotating shaft. On the other hand, since no preload is applied to the rotating shaft, when the motor is driven, the rotating shaft The problem is that it undesirably collides with the inner peripheral wall of the receiver, producing an abnormal noise called cogging noise. It was hot.

0004 This invention attempts to solve the above-mentioned problems, and the purpose of this invention is to A support structure for the motor shaft that does not generate cogging noise when the motor is driven. This is what we are trying to provide.

[0005]

[Means to solve the problem]

In order to achieve the above objectives, this invention uses oil-free metal for the rotating shaft of the motor. It is supported by a bearing made of In a support structure for a rotating shaft of a motor, the rotating shaft of the motor is It has a configuration in which a spring that biases in an oblique direction is provided on a rotating member.

[0006]

[Effect]

According to the above configuration, the rotating shaft machine of the motor is driven by the spring provided on the rotating body. Since it rotates while sliding against the inner circumferential wall, there is no cogging noise, and at the same time Uneven wear of the bearing can be prevented.

[0007]

【Example】

Embodiments of the present invention will be described below based on the drawings. Figures 1 to 9 are explanatory diagrams of embodiments of the present invention, and Figure 1 is a diagram showing the disconnection of a motor-driven variable resistor. Top view, Figure 2 is its perspective view, Figure 3 is an exploded perspective view of the variable resistor, Figure 4 is the reduction gear mechanism. Fig. 5 is a plan view of the reduction gear mechanism, and Fig. 6 is an exploded perspective view of the clutch mechanism. A plan view of the structure, FIG. 7 is a cross-sectional view taken along line A-A in FIG. 6, FIG. 8 is a cross-sectional view taken along line B-B in FIG. FIG. 9 is an operation explanatory diagram showing how the rotation shaft of the motor is supported on the bearing.

[0008] In these figures, 1 is a rotationally operated variable resistor, 2 is a reduction gear mechanism, 3 generally shows the clutch mechanism, and the motor drive variable resistor according to this embodiment. The device consists of a variable resistor 1, a reduction gear mechanism 2, a clutch mechanism 3, and a motor 4. It is roughly structured.

[0009] As shown in FIGS. 1 and 3, the variable resistor 1 is made of metal having a housing recess 5. a bearing 6, a rotary operation shaft 7 rotatably supported by the bearing 6, A driving body 8 made of metal die-casting is fixed to one end of the operating shaft 7, and an outer part is connected to the resistor board 9. A substrate holder 10 made of synthetic resin that is molded by tossert, and a rear stage of this substrate holder 10. A slider receiver 12 made of synthetic resin placed in the recess 11 and an LED which is a light emitting element. 13, and a holder 14 that holds the LED 13, and a substrate holder. 10 and the rear side of the bearing 6 are positioned using pins and holes provided between them. ing.

0010 The rotary operation shaft 7 has a through hole 15 at its center, and one end of the through hole 15 (rear The stage) is formed with a somewhat larger diameter. Also, one end of the rotary operation shaft 7 has a disc-shaped flange. 16 is integrally formed, and a part of the outer periphery of this flange 16 has an axis of a rotary operation shaft 7. An arcuate connecting portion 18 is integrally formed with a protrusion 17 extending parallel to the line. one On the other hand, an engaging protrusion 20 having a slit 19 is integrally formed at one end (rear stage) of the driving body 8. The driving body 8 and the connecting portion 18 are connected to each other by appropriate fixing means, that is, the main body. In the case of the embodiment, a pin 21 protruding from the connecting portion 18 is pressed into a hole 22 formed in the driver 8. It is integrated by entering the The drive body 8 and rotation operation integrated in this way The flange 16 of the working shaft 7 is disposed within the storage recess 5 and is formed at the bottom of the storage recess 5. The rotation of the rotary operation shaft 7 is caused by the projection 17 coming into contact with the stopper projection 23. The transfer range is regulated. The holder 14 has a thick base 24 at the lower end. The base 24 is located in a notch 25 formed near the stopper projection 23, It is clamped and fixed by the bearing 6 and the substrate holder 10. Also, from the base 24 The thin-walled upright portion 26 extending toward It reaches a space 27 defined between the two, so as not to impede the rotation of the rotary operation shaft 7. It's on. Furthermore, the LED 13 held by the holder 14 has a large diameter of the through hole 15. The lead terminal 28 of this LED 13 is held in the holder 14 and has been derived.

[0011] The engagement protrusion 20 of the drive body 8 fits into the center hole 29 bored in the substrate holder 10. The engaging protrusion 20 penetrates through the engaging hole bored in the center of the slider receiver 12. 30 is press-fitted. A slider 31 is attached to the front surface of this slider receiver 12. The slider 31 is in sliding contact with the resistor and current collector of the resistor board 9.

0012 As shown in FIGS. 1, 4, and 5, at the rear of the substrate holder 10, the A storage box 32 made of synthetic resin that houses the speed gear mechanism 2 and the clutch mechanism 3 is connected. The bearing 6, the substrate holder 10, and the storage box 32 described above are combined. are integrated so as not to be separated by a U-shaped frame 33 screwed to the motor 4. has been done.

[0013] The rotating shaft 34 of the motor 4 is mounted on a bearing 4a made of oil-less metal. It is loosely fitted between the inner peripheral wall 4b and the rotating shaft 34 with a minute clearance, and the front The rotating shaft 34 has a cylindrical first wall. The arm 35 is press-fitted and fixed. This first worm 35 is a cylindrical first wheel. This first wheel 36 is in mesh with the axis of the rotating shaft 34. It is integrally molded at the center of the rotating body 37 extending in the orthogonal direction. This rotating body 3 A cylindrical second worm 38 is integrally molded at one end of the second worm 7. The worm 38 meshes with a second tooth-shaped wheel 39, which is connected to the first worm 35. , the first wheel 36, the second worm 38 and the second wheel 39 It constitutes mechanism 2.

[0014] Further, as shown in FIG. 1, the recess 39a of the second wheel 39 has an annular portion 51a. and a spring 5 consisting of an elastic arm 51b extending obliquely from a part of the annular portion 51a. 1 is fixed to the elastic arm 51b, and the tip of the elastic arm 51b is connected to the protrusion on the front surface of the first worm 35. The rotating shaft 34 of the motor 4 is rotated in the axial direction by the elastic arm 51b. It is elastically biased in a diagonal direction. Note that both ends of the rotating body 37 are The storage box 32 is pivotally supported by a side wall of the storage box 32 and an elastic side plate 40 opposite thereto. This elastic side plate 40 elastically urges the rotating body 37 toward the second wheel 39. As a result, the distance between the first worm 35 and the first wheel 36 and between the second worm 38 and Absorbs backlash caused by bumps occurring between the second wheels 39 It is designed so that

[0015] The center of the second wheel 39 is rotatably supported on a support shaft 41. The tip of the shaft 41 is inserted into the slit 19 of the drive body 8. Figure 1 and diagram 5, the axis of the rotating shaft 34 and the axis of the supporting shaft 41 are almost the same. In other words, the rotating shaft 34 of the motor 4 and the rotating operating shaft 7 of the variable resistor 1 are on the same line. They are placed almost on the same line.

[0016] As shown in FIGS. 6 to 8, the second wheel 39 has an annular shape near its outer periphery. A concave groove 42 is formed in which an annular clutch plate 43 rotates automatically. It is currently fitted. This clutch plate 43 has a plurality of engagements arranged at equal intervals in the circumferential direction. Engagement protrusions 44 are formed, and leaf springs 45 are engaged with some of these engagement protrusions 44. The mating hole 46 is locked. This leaf spring 45 has a plurality of arms 47 extending radially. The engagement holes 46 are formed at the distal ends of the arms 47, respectively. moreover A disc-shaped retaining plate 48 is outsert-molded in the center of the leaf spring 45, and the front The support shaft 41 is press-fitted into the fitting hole 49 at the center of this holder 48, and the leaf spring 45 By locking a pair of locking pieces 50 formed at the center of the support shaft 41 to the circumferential surface of the support shaft 41. , the support shaft 41, the leaf spring 45, and the holder 48 are integrated. And this These include a second wheel 39, a support shaft 41, a leaf spring 45 having a holder 48, and a clutch. The clutch mechanism 3 is composed of the four members of the clutch plate 43.

[0017] When assembling the clutch mechanism 3 configured as described above, first, the second wheel 3 is assembled. While fitting the clutch plate 43 into the concave groove 42 of No. 9, from the rear end of the second wheel 39 Insert the support shaft 41, and then press the fitting hole 49 of the holder 48 onto the tip of the support shaft 41. the respective engagement holes 46 of the leaf spring 45 into the engagement protrusions 44 of the clutch plate 43. At this time, the length between each engagement hole 46 is an integral multiple of the length between each engagement protrusion 44 (in this embodiment, 2 times), by appropriately selecting the many engaging protrusions 44. , the leaf spring 45 can be easily connected to the clutch plate 43. In addition, the holding body 4 8 into the support shaft 41, both locking pieces 50 are automatically locked to the circumferential surface of the support shaft 41. Therefore, it is possible to reliably prevent the holder 48 from falling off the support shaft 41. stop When the clutch mechanism 3 is assembled in this way, the clutch plate 43 is fitted with a leaf spring. The elastic force from each arm 47 bent at 45 makes pressure contact with the second wheel 39. is biased in the direction of In this case, the span of each arm 47 is set to be sufficiently long. Therefore, a necessary and sufficient frictional force is applied between the second wheel 39 and the clutch plate 43. Moreover, since each arm 47 is formed symmetrically, the leaf spring 45 It is possible to apply elastic force to the clutch plate 43 in a well-balanced manner.

[0018] Next, the operation of the motor-driven variable resistor configured as described above will be explained. . First, we will explain the case where the variable resistor 1 is operated by the driving force of the motor 4. Ru. In this case, the rotational force of the motor 4 is applied to the first worm fixed to the rotating shaft 34. 35, a first wheel 36 that meshes with the first worm 35, and a first wheel 36 that meshes with the first worm 35. This second worm 38 rotates integrally with the wheel 36. The speed of the rotating shaft 34 is transmitted between them to the second wheel 39 which meshes with the Slowed down.

[0019] Next, the support structure of the rotating shaft 34 of the motor 4 to the bearing 4a will be explained with reference to FIG. do.

[0020] Now, when the motor 4 is in a stopped state, the first worm The elastic arm 5 of the spring 51 attached to the second wheel 39 has a protrusion 35a on the front surface of the spring 35 1b in the clockwise direction with respect to the axis X-X direction, and the motor 4 rotates. The rotating shaft 34 is also inclined in the same direction and comes into elastic contact with a part of the inner peripheral wall 4b of the bearing 4a of the motor 4. Ru. When the second wheel 39 rotates 180 degrees from the state shown in (a), it becomes (b). As shown, the protrusion 35a is rotated with respect to the axis X-X direction by the elastic arm 51b. The rotating shaft 34 of the motor 4 is also tilted in the same direction, and the bearing 4 is elastically biased counterclockwise. It comes into elastic contact with the opposite part of the inner circumferential wall 4b of a.

[0021] In this way, the rotation of the second wheel 39 causes the rotating shaft 34 of the motor 4 to rotate through the bearing 4. It comes into sliding contact with the inner circumferential wall 4b of a.

[0022] When the second wheel 39 rotates at a low speed as described above, the concave groove 4 of the second wheel 39 The clutch plate 43 fitted to the second wheel 2 is brought into alignment with the second wheel 39 by the frictional force between the two. A leaf spring 45 which physically rotates and is connected to this clutch plate 43 and this leaf spring 4 The support shaft 41 fixed to the holder 48 of No. 5 also rotates integrally with the second wheel 39. Therefore, the driving body 8 connected to the support shaft 41 also rotates in conjunction with the second wheel 39. vinegar That is, in this case, the clutch mechanism 3 is in the connected state, and the rotational force of the motor 4 is decelerated. The signal is transmitted to the driver 8 of the variable resistor 1 via the gear mechanism 2 and clutch mechanism 3.

[0023] When the drive body 8 is rotated by the driving force of the motor 4 in this way, the drive body 8 rotates. The slider receiver 12 press-fitted into the engagement protrusion 20 rotates relative to the resistance board 9, and the slider receiver 12 press-fits into the engagement protrusion 20. The resistance value is adjusted according to the change in the relative position between the slider 31 of 12 and the resistor of the resistor board 9. adjustments will be made. Furthermore, when the drive body 8 rotates, the rotation operation shaft 7 also rotates in conjunction with it. However, this rotary operation shaft 7 is in the range where the protrusion 17 comes into contact with both ends of the stopper protrusion 23. The LED 13 and the holder 14 are rotatable only within the range. 8 and the flange 16, and collide with the protrusion 17. There isn't. Therefore, power is supplied to the LED 13 via the lead terminal 28, and this When the LED 13 emits light, the light passes through the through hole 15 of the rotary operation shaft 7 to the outside. For example, by illuminating the display part of a knob (not shown) attached to the tip of the rotary operation shaft 7. can be done.

[0024] On the other hand, when the motor 4 is stopped and the rotation operation shaft 7 is manually operated, the rotation operation shaft 7 is The rotational force is transmitted to the slider receiver 12 via the driver 8, and the rotation of the slider receiver 12 Therefore, the resistance value is adjusted. Also, when the drive body 8 rotates, this rotational force is supported. It is transmitted to the clutch plate 43 via the shaft 41, the holder 48 and the leaf spring 45. Nono slips between the clutch plate 43 and the second wheel 39 and slips onto the second wheel 39. is not transmitted, and the clutch mechanism 3 is in a disconnected state. In addition, during such manual operation, L When the ED 13 emits light, this light passes through the through hole 15 and reaches the outside of the rotary operation shaft 7. Then, as in the case of motor drive described above, the display part of the knob (not shown) is illuminated. I can do it.

[0025] In this way, in the above embodiment, the recess 39 of the second wheel 39 (rotating member) a includes an annular portion 51a and an elastic arm extending diagonally from a part of the annular portion 51a; 51b is fixed, and the tip of the elastic arm 51b is connected to the first arm. It comes into elastic contact with the protrusion 35a on the front surface of the ohm 35, and the motor 4 is Since the rotating shaft 34 is elastically biased in a diagonal direction with respect to the axis X-X direction, the motor The rotating shaft 34 of the motor 4 rotates while slidingly contacting the inner peripheral wall 4b of the bearing 4a of the motor 4. Therefore, it is possible to prevent the cogging noise that conventionally occurs, and at the same time, the bearing 4 Uneven wear of the inner circumferential wall 4b of a can be prevented.

[0026]

[Effect of the idea]

As explained above, according to the present invention, the rotating shaft of the motor is made of an oil-less material. Since the motor rotates while sliding against the inner peripheral wall of the bearing, cogging noise is generated when the motor is driven. At the same time, uneven wear of the inner peripheral wall of the bearing can be prevented.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a motor-driven variable resistor of the present invention.

FIG. 2 is a perspective view of the motor-driven variable resistor of the present invention.

FIG. 3 is an exploded perspective view of the variable resistor of the present invention.

FIG. 4 is an exploded perspective view of the reduction gear mechanism and clutch mechanism of the present invention.

FIG. 5 is a plan view of the reduction gear mechanism of the present invention.

FIG. 6 is a plan view of the clutch mechanism of the present invention.

7 is a sectional view taken along line AA in FIG. 6. FIG.

8 is a sectional view taken along line BB in FIG. 6. FIG.

FIG. 9 is an explanatory diagram showing how the rotating shaft of the motor of the present invention is supported on a bearing.

[Explanation of symbols]

4 motor 4a Bearing 4b Inner peripheral wall 34 Rotation axis 39 Second wheel (rotating member) 51 Spring

Claims (1)

[Scope of utility model registration request] 1. A support structure for a rotating shaft of a motor, wherein the rotating shaft of a motor is supported in a bearing made of an oil-less metal with a minute clearance between the inner circumferential wall of the bearing and the rotating shaft of the motor. A support structure for a rotating shaft of a motor, characterized in that a spring that biases the rotating shaft in a diagonal direction with respect to the axial direction is fixed to a rotating member.