KR950007808Y1 - Variable resistance for motor driving - Google Patents

Abstract

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Description

Motor driven variable resistor

1 to 9 are related to an embodiment of the present invention, Figure 1 is a cross-sectional view of a motor-driven variable resistor.

2 is a perspective view thereof.

3 is an exploded perspective view of a variable resistor.

4 is an exploded perspective view of the deceleration gear strip and the clutch mechanism.

5 is a plan view of the reduction gear mechanism.

6 is a plan view of the clutch mechanism.

7 is a cross-sectional view taken along line 6 of FIG.

8 is a cross-sectional view taken along line 6 of FIG.

FIG. 9 is an explanatory diagram showing a step of manufacturing a leaf spring included in the clutch mechanism. FIG.

10 to 12 relate to the prior art example,

10 is a side view of a motor-driven variable resistor.

11 is a plan view of the deceleration gear mechanism.

12 is a sectional view of the clutch mechanism.

* Explanation of symbols for main parts of the drawings

1: variable resistor 2: deceleration gear mechanism

3: clutch mechanism 4: motor

7: rotating operation shaft 32: storage box

34: axis of rotation 39: second wheel (wheel)

41: axis 42: 凹 groove

43: clutch plate 45: leaf spring

46: engaging hole 47: crossbar

48: holding body 49: fitting hole

50: hanger

The present invention relates to a motor-driven variable resistor which can adjust the resistance value according to the driving force of the motor and manual operation, and in particular, to a clutch mechanism that continues to transmit power between the motor and the variable resistor. It relates to a deceleration gear mechanism.

10 to 12 illustrate a conventional example of this type of motor-driven variable resistor, FIG. 10 is a side view of the motor-driven variable resistor, and FIG. 11 is a plan view of the reduction gear mechanism provided in the variable resistor. 12 is a sectional view of the clutch mechanism provided in the variable resistor.

In these figures, reference numeral 100 denotes a rotationally operated variable resistor as a whole, and the variable resistor 100 includes a case 101 having both ends open, and a pair of resistors fixed to both ends of the case 101. A shaft 102 fixed to one open end of the substrate 102, a case 101, a rotation operation shaft 104 supported by a rotational freedom in the shaft 1003, and housed in the case 101 for rotation. It consists of a slider base (not shown) which rotates integrally with the operation shaft 104, and a slide which is not shown, which is fixed to both surfaces of this slider base, and slides on both said resistor plates 102. As shown in FIG.

A box-shaped storage box 105 is fixed to the other open end of the case 101, and the motor 106 is mounted on the mounting surface on the side opposite to the mall variable resistor 100 in the storage box 105. Is fixed. The rotary shaft 107 of the motor 106 is inside the storage box 105, the rotary shaft 107 is inside the storage box 105, and the cylindrical first worm is formed on the rotary shaft 107. 108 is stuck. The first worm 108 is now cogwheeled with a cylindrical first wheel 109 orthogonal to the orthogonal axis of rotation of the rotary shaft 107, and a second cylindrical cylindrical body which rotates integrally with the first wheel 109. The worm 110 meshes with the second wheel 111 having a cylindrical shape orthogonal to the second worm 110, and the first worm 108, the first wheel 109, and the second tooth. The deceleration gear mechanism is comprised by the bending 110 and the 2nd wheel 111. As shown in FIG.

As shown in FIG. 12, the support shaft 113 and the drive body 114 integrated by the speed nut 112 which are pressed are inserted in the center of the said 2nd wheel 111, and the inner support shaft ( A cross-sectional plate-shaped locking portion 116 formed at the tip of the rotary operation shaft 104 is inserted into the groove 115 of the cross-sectional plate shape formed at one end of the 113.

Moreover, between the outer drive body 114 and the said 2nd wheel 111, the pad 117 which becomes a felt material etc. is made, The drive body 114 is the 2nd wheel 111 and the support shaft 113. The force is applied in the direction of the second wheel 111, that is, the direction in which the pad 117 is pressed by the spring 118 elastically installed therebetween. And the clutch mechanism is comprised by these 2nd wheel 111, the support shaft 113, the drive body 114, the pad 117, and the spring 118. As shown in FIG.

Next, the operation of the conventional motor drive type variable resistor configured as described above will be described.

First, the case where the motor 106 is driven will be described. The rotational force of the motor 106 is controlled by the second wheel 111 through the first worm 108, the first wheel 109, and the second worm 110. ), The speed is reduced among them.

When the second wheel 111 rotates, the rotational force is transmitted to the driving body 114 through the pad 117, so that the rotation connected to the supporting shaft 113 and the supporting shaft 113 integral with the driving body 114 is performed. The operation shaft 104 rotates, the slider support (not shown) fixed to the rotation operation shaft 104 rotates with respect to the resistor plate 102, and the resistance value of the variable resistor 100 is adjusted.

On the other hand, when the rotary operating shaft 104 is manually operated, the rotational force of the rotary operating shaft 104 is transmitted to the drive body 114 through the support shaft 113, but between the drive body 114 and the pad 117. Since the slide is not transmitted to the second wheel 111, the slider support (not shown) is rotated to adjust the resistance of the variable resistor 100.

By the way, the conventional clutch mechanism comprised as mentioned above has the pad 117 and the 2nd wheels of both sides by the elastic force of the spring 118 wound around the support shaft 113 and the drive body 114 integrated with each other ( Since the friction force (pre-cushion) can be provided between the 111 and the drive body 114, the clutch mechanism is elongated in the axial direction of the spring 118, and the problem that the motor-driven variable resistor increases in size. there was.

In addition, in the conventional deceleration gear mechanism configured as described above, power transmission between the first worm 108 and the first wheel 109 and between the second worm 110 and the second wheel 111 is performed simultaneously with the cylindrical worm. Since it is combined with a cylindrical wheel (screw gear), the rotary shaft 107 of the motor 106 connected to the first worm 108 and the rotary shaft of the variable resistor 100 connected to the second wheel 111 ( Between the 104 and the above, it is necessary to have a length longer than the sum of each change of the first worm 108 and the second wheel 111, and there is a problem that the motor-driven variable resistor is enlarged.

The present invention has been made in view of the above-described situation of the related art, and an object thereof is to provide a small motor-driven variable resistor. In a motor-driven variable resistor in which the rotational force from the rotational operation shaft of the variable resistor to the deceleration gear mechanism is blocked by the clutch mechanism, the clutch mechanism is formed in an annular groove formed near the outer circumference of the wheel. A clutch plate fitted freely to rotate, a leaf spring having a radial crosspiece engaged with the clutch plate, and a support shaft which freely supports the leaf spring at the center of the wheel, and connects the support shaft to the rotary operation shaft. It is characterized by.

As described above, when a leaf spring having a radial crossbar is used as the spring means of the clutch mechanism, when the friction force is applied between the wheel and the clutch plate by the leaf spring, sufficient spring pressure is applied regardless of the flat leaf spring. It can secure and reduce the thickness of the clutch mechanism. In addition, when a side worm gear in which a cylindrical cylindrical second worm and a second wheel of a crown gear are combined is used as a part of the reduction gear mechanism, the rotational operation of the variable shaft connected to the second axis and the rotary shaft of the motor connected to the first worm. The axis can be placed on the same line as it.

1 is a cross-sectional view of a motor-driven variable resistor, FIG. 2 is a perspective view thereof, FIG. 3 is an exploded perspective view of the variable resistor, FIG. 4 is an exploded perspective view of the reduction gear mechanism and the clutch mechanism, and FIG. 5 is a plan view of the reduction gear mechanism, FIG. FIG. 6 is a sectional view taken along line VII-VII L, FIG. 8 is a sectional view taken along line VII-VII of FIG. 6, and FIG.

In these drawings, reference numeral 1 denotes a variable resistor of a rotation operation type, numeral 2 denotes a deceleration gear mechanism and numeral 3 denotes a clutch mechanism, respectively. It consists of the variable resistor 1, the reduction gear mechanism 2, the clutch mechanism 3, and the motor 4.

As shown in FIG. 1 and FIG. 3, the variable resistor 1 includes a metal shaft 6 having a receiving recess 5 and a rotation operation shaft supported by a rotational freedom in the shaft 6. (7), the drive body 8 of the metal casting agent fixed to the one end of this improvement operation axis | shaft 7, the board | substrate support body 10 made from synthetic resin externally shape | molded by the resistor board 9, and this board | substrate It consists of a slider support 12 made of synthetic resin disposed in the recess 11 at the rear end of the retainer 10, and a holder 14 for holding the LED 13 and the LED 13, which are light emitting elements. The rear end side of the board | substrate carrier 10 and the bearing 6 is positioned using the board and hole provided in both.

The rotary operation shaft 7 has a through hole 15 at its center, and one end (rear end) of the through hole 15 is formed to have a slightly large diameter. In addition, a disk-shaped flange portion 16 is integrally formed at one end of the rotary operation shaft 7, and a part of the outer peripheral edge of the flange 16 extends in parallel with the axis of the rotary operation shaft 7. Through the 17, the bow-shaped connecting portion 18 is integrally formed. On the other hand, at one end (rear end) of the driving body 8, the locking protrusion 20 having a slit 19 is integrally formed, and the driving body 8 and the connecting portion 18 are enemy fixing means, that is, In the present embodiment, the pin 21 protruding from the connecting portion 18 is integrated by press-fitting into the hole 22 drilled in the driving body 8. The flange 8 of the driving body 8 and the rotary operation shaft 7 integrated in this way is disposed in the accommodating recess 5 and formed on the stopper projection 23 formed at the bottom of the accommodating recess 5. As the protruding portion 17 abuts, the rotation range of the rotary operating shaft 7 is restricted.

The holder 14 has a thick base portion 24 at its lower end, and the base portion 24 is located in the notched portion 25 formed in the vicinity of the stopper projection 23, and the bearing 6 And the substrate holder 10 are fixed.

In addition, the vertical portion 26 having a thin thickness extending upward from the base portion 24 enters the space 27 formed between the flange portion 16 and the driving body 8 by the protruding portion 17. This prevents the rotation of the rotational operation shaft 7 from interfering.

The LED 13 held by the holder 14 is located at the large diameter portion of the through hole 915, and the lead terminal 28 of the LED 13 penetrates through the holder 14 and is led outward. have.

The locking protrusion 20 of the driving body 8 penetrates through the center hole 29 drilled in the substrate holder 10, and the locking protrusion 20 is a locking hole drilled in the center of the slider support 12. It is press-fitted into 30. A slider 31 is mounted on the entire surface of the slider support 12, and the slider 31 is in sliding contact with a resistor or a contact of the resistor plate 9.

As shown in FIG. 1, FIG. 4, and FIG. 5, at the rear end of the substrate holding member 10, a storage box 32 of a synthetic resin body in which the reduction gear mechanism 2 and the clutch mechanism 3 are incorporated. The three sets of the bearing 6 and the substrate holder 10 and the storage box 32 are integrated so as not to be separated by the frame 33 screwed to the motor 4.

The rotary shaft 34 of the motor 4 is placed inside the storage box 32, and the cylindrical first worm 35 is press-fitted and fixed to the rotary shaft 34.

The first worm 35 is toothed with a cylindrical first wheel 36 and a tooth, the first wheel 36 is a rotary body 37 extending in a direction orthogonal to the axis of the rotary shaft 34 It is formed integrally with the central portion of the.

One end of the rotating body 37 is integrally formed with a second cylindrical worm 38, the second worm 38 is meshed with the second gear 39 of the crown gear type. The deceleration gear mechanism 2 is constituted by the first worm 35, the first wheel 36, the second worm 38, and the second wheel 39.

In addition, both ends of the rotating body 37 are axially provided on the side wall of the storage box 32 and the elastic side plate 40 opposite thereto, and the elastic side plate 40 supports the rotating body 37. By applying an elastic force to the inclined lower side (axial direction and second wheel 39 direction), between the first worm 35 and the first wheel 36 and between the second worm 38 and the second wheel ( 39) are designed to absorb shocks due to backlash between each.

The center of the second wheel 39 is supported by a rotational free passage on the support shaft 41, and the tip of the support shaft 41 is inserted into the slit 19 of the drive body 8. As is clear from FIGS. 1 and 5, the axis of the rotational shaft 34 and the axis of the support shaft 41 are on the same line, that is, the rotational axis 34 of the motor 4 and the variable resistor 1. The rotary operation shaft 7 of) is arranged on substantially the same line.

6 to 8, an annular fin groove 42 is formed in the vicinity of the outer circumference of the second wheel 39, and the annular clutch plate is formed in the fin groove 42. As shown in FIG. (43) is fitted with a rotary free path. The clutch plate 43 is provided with a plurality of locking projections 44 with equal intervals in the circumferential direction, and these locking projections 44 are formed, and a plurality of leaf springs 44 The catching hole 46 of 45 is caught. The leaf spring 45 has a plurality of cross bars 47 extending radially, and the engaging holes 46 are bored in the distal ends of the cross bars 47, respectively.

In the center of the leaf spring 45, a disk-shaped retaining member 48 is formed on the outer surface, and the support shaft 41 is pressed into the fitting hole 49 in the center of the retaining member 48. By hanging a pair of engaging pieces 50 formed at the center of the leaf spring 45 on the main surface of the support shaft 41, the support shaft 41, the leaf spring 45 and the retainer body 48 are integrated. have. And the clutch mechanism 3 is comprised by the four members of these 2nd wheel 39, the support shaft 41, the leaf spring 45 which has the retaining body 48, and the clutch plate 43. As shown in FIG.

Referring to FIG. 9, the process of externally shaping the holding member 48 on the leaf spring 45 will be described. First, as shown in FIG. Pull out. At this time, four places of the parts which become the two latching pieces 50 among the parts used as the crosspiece 47 are connected by the hoop material.

Next, the retaining body 48 is formed as shown in FIG. 9B by sending the hoop material subjected to the blank processing in this way to a molding mold (not shown) and filling the molten resin into the cavity of the molding mold. . Subsequently, a bending process is performed on the portion of the crosspiece 47 that becomes the base portion and the locking piece 50, and the portion shown by the two-dot dotted line in Fig. 9B is cut again to show in Fig. 9C. A leaf spring 45 having a holding member 48 as described above is obtained.

When assembling the clutch mechanism 3 configured as described above, first, the clutch plate 43 is fitted into the groove 42 of the second wheel 39 and at the rear end of the second wheel 39, 41 is inserted, and then the fitting hole 49 of the retaining member 48 is press-fitted to the distal end of the support shaft 41 so that the engaging projections 46 of the leaf spring 45 engage the engaging projections of the clutch plate 43. FIG. 944). At this time, since the length between each locking hole 46 is set to an integral multiple of the length between each locking projections 44 (in this embodiment, twice), the plate is selected by selecting a plurality of locking projections 44 appropriately. The spring 45 can be easily connected to the clutch plate 43.

Moreover, when the retaining member 48 is press-fitted to the support shaft 41, both locking pieces 50 are automatically caught by the main surface of the support shaft 41, so that the retaining member 48 can be removed from the support shaft 41. Can be prevented. Then, when the clutch mechanism 3 is assembled in this way, the clutch plate 43 has a force in the direction in which the clutch plate 43 is pressed against the second wheel 39 by the elastic force at each crosspiece 47 bent to the leaf spring 45. Is added. In this case, since the span of each crosspiece 47 is set sufficiently long, necessary and sufficient frictional force can be imparted between the second wheel 39 and the clutch plate 43, and the crossbars 47 are also provided. Since it is formed in the left-right symmetry type, the elastic force can be applied to the clutch plate 43 at the leaf spring 45 in a balanced manner.

Next, the operation of the motor-driven variable resistor configured as described above will be described. First, the case where the variable resistor 1 is operated in accordance with the driving force of the motor 4 will be described. In this case, the rotational force of the motor 4 is the first worm 35 fixed to the rotary shaft 34 and the first wheel 36 meshed with the first worm 35, and the first wheel. Through the second worm 38 which is integrally rotated with the 36, the second worm 38 is transmitted to the second wheel 39 which is engaged with the speed of the rotational shaft 34. Slows down.

In this way, when the second wheel 38 rotates at a low speed, the clutch plate 43 fitted into the groove 42 of the second wheel 39 is integral with the second wheel 39 by the friction force between them. To rotate the plate spring 45 connected to the clutch plate 43 and the support shaft 41 fixed to the holding member 48 of the leaf spring 45 integrally with the second wheel 39. Therefore, the drive body 8 connected to the support shaft 41 also rotates in association with the second wheel 39. That is, in this case, the clutch mechanism 3 is in a connected state, and the rotational force of the motor 4 is transmitted to the drive body 8 of the variable resistor 1 via the reduction gear mechanism 2 and the clutch mechanism 3.

In this way, when the drive body 8 rotates according to the driving force of the motor 4, the slider support 12 press-fitted to the locking protrusion 20 of the drive body 8 rotates with respect to the resistor plate 9, and the slider The resistance value is adjusted in response to a change in the relative position between the slider 31 of the support 12 and the resistor of the resistor plate 9. In addition, when the driving body 8 rotates, the rotary operation shaft 7 also rotates in association with it, but the rotary operation shaft 7 rotates only within a range in which the protrusion 17 is in contact with both ends of the stopper protrusion 23. In this range, the LED 13 and the holder 14 are located in the space 27 formed along the driving body 8 and the flange 16 and do not collide with the protrusion 17. Therefore, when power is supplied to the LED 13 through the lead terminal 28, and the LED 13 emits light, the light reaches the outside through the through hole 15 of the rotary operation shaft 7, for example. For example, the display portion of a knob (not shown) attached to the tip of the rotary operation shaft 7 can be dimmed.

On the other hand, when the motor 4 is stopped and the rotary operation shaft 7 is manually operated, the rotational force of the rotary operation shaft 7 is transmitted to the slider support 12 through the drive body 8, and the slider support. The resistance value is adjusted in accordance with the rotation of (12). In addition, when the drive body 8 rotates, the rotary shaft is transmitted to the clutch plate 43 through the support shaft 41, the retaining body 48, and the leaf spring 45, but the clutch plate 43 and the second plate are rotated. Slips between the wheels 39 and are not cut by the second wheels 39, and the clutch mechanism 3 is cut off. In addition, when the LED 13 emits light during such manual operation, the light reaches the outside of the rotary operation unit 7 through the through hole 15, and the display unit of the handle (not shown) as in the case of the motor driving described above. Can be dimmed.

Thus, in the above embodiment, since the flat leaf spring 45 is used as the elastic means required for the clutch mechanism 3, the clutch mechanism 3 can be thinned, and the motor-driven variable resistor can be made thin. You can do it.

In addition, since the disk-shaped retaining member 48 is the outer surface at the center of the leaf spring 45, the support shaft 48 and the leaf spring 45 can be integrated through the retaining member 48. The assembly between the 41 and the leaf spring 45 can be performed by a simple operation called press-in (snap-in), and the hook piece 50 prevents the leaf spring 45 from falling off. You can do it.

Moreover, the clutch plate which provided the several crosspieces 47 radially extended in the leaf | plate spring 45, and fitted the front-end | tip of these crosspieces 47 into the groove | channel 42 of the outer periphery of the 2nd wheel 39 was carried out. Since it is elastically contacted with 43, the friction force required between the 2nd wheel 39 and the clutch plate 43 can be provided according to the sufficiently long span of each crossbar 47. As shown in FIG.

In addition, since the leaf spring 45 is symmetrically shaped, the elastic force from the leaf spring 45 to the clutch plate 43 can be distributed in a balanced manner, and therefore, the second spring 39 and the clutch plate 43 are good. The friction force can be given.

Then, a plurality of locking projections 44 are formed in the clutch plate 43 at the same pitch interval, and the holes 46 drilled in the crosspieces 47 of the leaf springs 45 are inserted into the arbitrary locking projections 44. Since it is possible to do this, the leaf spring 45 can be easily connected to the clutch plate 43.

In the above embodiment, a cylindrical second worm 38 is used as part of the reduction gear mechanism 2 and a second wheel 39 of the crown gear in which teeth are engaged with the second rim 38. Since the second wheel 39 transmits the rotation to the drive body 8 (rotation operation shaft 7) of the variable resistor 1 through the clutch mechanism 3, the rotation shaft of the motor 4 ( 34) and the rotary operation shaft 7 of the variable resistor 1 can be arranged in a straight line, and the motor-driven variable resistor is remarkably compared with the conventional product which cannot be largely hidden on both sides. It can be miniaturized.

In addition, one end of the rotating body 37 is supported by the elastic side plate 40 integrally molded to the storage box 32, and according to the elastic force of the elastic side plate 40, the first worm 35 and the first wheel ( Since the backlash between 36 and the second worm 38 and the second wheel 39 is absorbed, the supporting structure of the rotating body 37 having the first wheel 36 and the second worm 38 is provided. Can be simplified.

As described above, according to the present invention, the clutch mechanism provided between the reduction gear mechanism and the rotation control shaft of the variable resistor can be thinned using a flat plate spring, and the rotation shaft of the motor and the rotation control shaft of the variable resistor can be reduced. Since it can arrange | position on the same line, the motor drive type | mold variable resistor can be miniaturized by that much.

Claims (2)

A reduction gear mechanism connected to a motor and a rotation shaft of the motor, and a clutch mechanism provided between a wheel forming a gear of the final stage of the reduction gear mechanism and a rotation operation shaft of the variable resistor, wherein the rotation of the motor is performed by the motor. In the motor-driven variable resistor which is transmitted to the rotation operation shaft of the variable resistor through the reduction gear mechanism and the clutch mechanism, the rotational force from the rotation operation shaft of the variable resistor to the reduction gear mechanism is blocked by the clutch mechanism. And the clutch mechanism rotates freely into a toroidal groove formed in the outer periphery of the wheel, a leaf spring having a cross beam of radiation substantially between the clutch plate, and the leaf spring rotated at the center of the wheel. A motor configured to freely support and connect the support shaft to the rotation operation shaft Driven potentiometer. The decelerating gear mechanism includes a cylindrical first worm fixed to a rotating shaft of the motor, a cylindrical first wheel with teeth engaged with the first worm, and a cylindrical second worm integrally rotating with the first wheel. And second wheels of the crown gear with teeth meshed with the second worm, such that the rotary shaft of the motor connected to the first worm and the rotary operation shaft of the variable resistor connected to the second wheel are arranged on the same line thereof. The motor-driven variable resistor according to claim 1 characterized by the above-mentioned.