JPH10127009A - Geared motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To return a relationship between the operating condition of a transmission system for turning force and the turning condition of an output shaft to a prescribed positional relationship when the transmission system is connected by a clutch mechanism again, by forming a sloped surface which is formed adjacently to a recess in the clutch mechanism and guides a protrusion into the recess. SOLUTION: When an output gear 20 and a ratchet gear 41 relatively-rotate forcibly, the first, second and third engaging states occur intermittently according to the relative rotational direction, and when a clutch mechanism 40 is engaged, the first engaging state is made. In a range where a sloped surface 20D is formed, a protruding part 41A is apt to enter the first recess 20B, and the clutch mechanism 40 is engaged easily in the first engaging state. Therefore, the clutch mechanism 40 is engaged in the specified first engaging state completely, and the output gear 20 and the ratchet gear 41 return to the prescribed positional relationship completely. It is thus possible to keep operating characteristics of a louver and so on constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geared motor for transmitting the rotating power of a motor to a rotating body via a gear train and outputting the rotating power of the rotating body from an output shaft via a clutch mechanism. .

[0002]

2. Description of the Related Art As a geared motor of this type, for example, a geared motor having a link mechanism for reciprocally rotating an output shaft by a predetermined angle by the rotating power of the motor is called an oscillating geared motor. It is used as a drive source for swinging a louver for adjusting the wind direction of an air conditioner or a hot air heater. The present applicant has previously proposed such a rocking type geared motor having a torque limiter mechanism (Japanese Utility Model Laid-Open No. 7-3270). This torque limiter mechanism has a structure in which a washer and a slip member are interposed in the transmission system of the rotating power between the motor and the output shaft, so that excessive rotating power is applied to the output shaft or the output shaft is When an overload is applied, the slip between the washer and the slip member slips, and the transmission system of the rotational power is automatically cut off. As a result, it is possible to prevent, for example, damage to an air conditioner equipped with a geared motor, a louver for adjusting the wind direction of a hot air heater, and the geared motor itself.

[0003]

SUMMARY OF THE INVENTION The torque limiter mechanism in the geared motor proposed above is designed to prevent a slip from occurring between the washer and the slip member.
They immediately return to the connected state, and the power transmission system is reconnected. Therefore, the relationship between the operating state of the transmission system and the rotation state of the output shaft changes according to the point in time when the transmission system is reconnected. In the case of a built-in rocking type geared motor, the relationship between the operating state of the link mechanism and the operating state of the louver or the like may deviate, and the operating characteristics of the louver may change.

[0004] The present invention has been made in view of such circumstances, and when the excessive rotational force applied to the output shaft is released and the rotational power transmission system is reconnected by the clutch mechanism. It is another object of the present invention to provide a geared motor that can surely return the relationship between the operation state of the transmission system and the rotation state of the output shaft to a predetermined positional relationship.

[0005]

In the geared motor according to the present invention, the rotating power of the motor is transmitted to a rotating body via a gear train, and the rotating power of the rotating body is transmitted from an output shaft via a clutch mechanism. In the geared motor that outputs, the clutch mechanism is disposed coaxially with the rotating body, is disposed so as to be rotatable relative to the rotating body, and is capable of being moved close to and away from the rotating body along a direction facing the rotating body. A driven body connected to the output shaft, an urging means for urging the driven body in a direction approaching the rotating body, and a convex portion provided on one side of an opposing surface of the rotating body and the driven body, A concave portion provided on the other side of the opposing surface of the rotating body and the driven body and capable of engaging with the convex portion, and a slope provided adjacent to the concave portion and guiding the convex portion into the concave portion. It is characterized by the following.

Here, in the geared motor according to a second aspect, the concave portion and the convex portion are formed in plural numbers in the circumferential direction of the rotating body and the driven body, respectively, and the slope is formed in the plural concave portions. The geared motor according to claim 3 is formed adjacent to at least one of the plurality of recesses.
When the slope is formed adjacently, the inner dimension is formed larger than that when the slope is not formed adjacently.

A geared motor according to a fourth aspect is characterized in that the slope according to any one of the first to third aspects is formed adjacent to both sides of the recess. According to a fifth aspect of the present invention, in the geared motor according to any one of the first to fourth aspects, an index indicating that the rotating body and the driven body are at a predetermined relative rotating position is formed at a portion opposed to the rotating body. It is characterized by the following.

According to a sixth aspect of the present invention, there is provided a geared motor, wherein the gear train according to any one of the first to fifth aspects reciprocates the rotating body by a predetermined angle by the rotating power of the motor. It is characterized by having. A geared motor according to a seventh aspect is characterized in that, in any one of the first to sixth aspects, the rotating body is an output gear incorporated in the gear train.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. This embodiment shows an example in which the geared motor according to the present invention is applied to an oscillating geared motor, and an output shaft of the motor (hereinafter referred to as “motor output”) is provided by a gear train and a link mechanism in a casing 1 thereof. 10) and output gear (rotating body) 2
0, a power transmission system is formed, and a clutch mechanism 40 is formed between the output gear 20 and the output shaft 30.

First, a power transmission system between the motor output shaft 10 and the output gear 20 will be described with reference to FIGS. 1 and 2. In the above power transmission system, rotation of the motor output shaft 10 is controlled by two sets of reduction gears. After being decelerated by 11 and 12, it is transmitted to the first operating gear 13. O1, O in the figure
2, O3 and O4 are motor output shaft 10, reduction gear 1
The first operating gear 13 has a camshaft 13A at a position shifted from the rotating axis O4. Reference numeral 14 denotes a link member having an axis O3 as a swing center, and a cam shaft 13A of the first operating gear 13 is slidably fitted in an elongated hole 14A formed in an intermediate portion thereof. hand,
When the gear 13 rotates, the gear 13 swings as shown by a two-dot chain line in FIG. A shaft portion 15A formed on the second operating gear 15 is slidably fitted into an elongated hole 14B formed at an end of the link member 14. O5 is a rotation axis of the second operation gear 15, and the shaft portion 15A is formed at a position shifted from the rotation axis O5.
By swinging, the second operation gear 15 reciprocates by a predetermined angle θ. And this second
The operation gear 15 meshes with the output gear 20.
Therefore, the rotation of the motor output shaft 10 causes the output gear 20 to reciprocate at a predetermined angle. O6 is the output gear 20 and the output shaft 30
Is the axis of rotation.

Next, the clutch mechanism 40 will be described. The clutch mechanism 40 is composed of the output gear 20 and the output shaft 3 which are relatively rotatably provided on the same axis O6.
0 is formed between the opposite surfaces. Output gear 2
2 is rotatably supported by a support shaft 21 on an axis O6 as shown in FIG. 2, and the lower end of the support shaft 21 is rotatably held by a lower plate 1A of a casing 1 via a bearing 22. I have. The upper end of the support shaft 21 is non-rotatably coupled to the output shaft 30, and the output shaft 30 is rotatably held on the upper plate 1 </ b> B of the casing 1. Therefore, the support shaft 21 rotates integrally with the output shaft 30, and the output gear 20 can rotate with respect to the support shaft 21.

A recess 20A is formed around the support shaft 21 of the output gear 20, and a ratchet gear 41 as a rolling element is rotatably positioned inside the recess 20A. On the lower surface of the ratchet gear 41, as shown in FIGS.
A plurality of convex portions 41A are formed along the circumferential direction. In the case of this example, a total of four hemispherical convex portions 41A are formed at equal intervals of 90 °, and the diameter of the convex portions 41A is about 1.2 mm. In the center of the ratchet gear 41, a through hole 41B through which the support shaft 21 passes is provided.
And a groove 41C which is fitted to a projection (not shown) of the support shaft 21 and is prevented from rotating. Therefore, the ratchet gear 41 is prevented from rotating with respect to the support shaft 21.

On the other hand, the recess 20A of the output gear 20
As shown in FIG. 5, a plurality of recesses 20B, 20C
And a slope 20D. In the present embodiment, a total of four first recesses 20B located at equal intervals of 90 ° along the circumferential direction, and a total of eight first recesses 20B adjacent to one first recess 20B, one on each side in the circumferential direction. A total of eight first recesses 20C are formed, each of which is located two each between the slope 20D and the slope 20D. Also, the first recess 20B and the second
The concave portion 20C is formed as a circular hole, and the first concave portion 20C is formed.
The diameter of B is 1.0 mm, which is larger than the diameter of 0.85 mm of the second concave portion 20C, and the angles θ1, θ2, and θ3 in FIG. 5 are 16 °, 25 °, and 36 °, respectively. A concave portion 20E as an index is provided on the upper surface of the output gear 20.
The recess 20E and the ratchet gear 4
The positional relationship between the gears 20 and 41 at the time of assembly can be recognized and adjusted based on the positional relationship with the first convex portion 41A. Further, the ratchet gear 41 and the output shaft 30
And a spring 42 for urging the ratchet gear 41 downward.

Next, the operation of the oscillating geared motor having the above configuration will be described. As described above, the second operating gear 15 is reciprocated by the predetermined angle θ by the power transmission system, and the output gear 20 is reciprocated by the predetermined angle in conjunction therewith. On the other hand, the clutch mechanism 40
In other words, since the spring 42 presses the ratchet gear 41 against the output gear 20, the former convex portion 41A is engaged with one of the latter concave portions 20B and 20C.

In the case of this embodiment, the four convex portions 41A have 9
0 ° intervals, four first recesses 20B form 90 ° intervals, and four of the eight recesses 20C (hereinafter referred to as “first set of second recesses”) 20C form 90 ° intervals. And the other four second recesses 20 (hereinafter referred to as “second set of second recesses”) 20C form 90 ° intervals, so that the engagement between the projection 41A and the recesses 20B, 20C is established. There are three types of first, second, and third engagement states as follows. The first engagement state is a state in which each projection 41A is engaged with each first recess 20B, and the second engagement state is a state in which each projection 41A is engaged with each first set of second recesses 20C. There is a third engagement state for each projection 4
1A is in a state of being engaged with each of the second set of second concave portions 20C. However, as described above, since each second recess 20C is set smaller than each first recess 20B, the engagement force in the second and third engagement states is small, and the clutch mechanism 40 transmits the rotational power. At this time, the first engagement state occurs in which a large engagement force is generated.

Therefore, the clutch mechanism 40 is usually
The connection is transmitted by the first engagement state, and the rotational power of the output gear 20 is transmitted to the output shaft 30. Further, since the engagement force in the first engagement state becomes larger by the inclination depth of the slope 20D, the engagement force can be optimally set including a relatively large range.

Now, for example, an excessive turning force is applied to the output shaft 30 or an overload is applied to the output shaft 30, so that the connection force between the output gear 20 and the ratchet gear 41 is larger than the connection force of the clutch mechanism 40. When a strong force is applied,
The first engagement state between them is not maintained, the ratchet gear 41 is displaced upward against the urging force of the spring 42, and the output gear 20 and the ratchet gear 41 are forcibly rotated relative to each other, and Is turned off. As a result, it is possible to prevent, for example, damage to an air conditioner equipped with a geared motor, a louver for adjusting the wind direction of a hot air heater, and the geared motor itself.

By the way, when the output gear 20 and the ratchet gear 41 are forcibly rotated relative to each other, the first, second, and third engagement states described above are intermittently changed according to their relative rotation directions. Then, when the clutch mechanism 40 is connected again, the first engagement state is established. Further, in the range where the slope 20D is formed, the projection 41A easily enters the first recess 20B, and the clutch mechanism 40 is easily connected in the first engagement state. Therefore, the clutch mechanism 40 is securely connected in the specified first engagement state, and the output gear 20 and the ratchet gear 41 reliably return to the predetermined positional relationship. As a result, the output gear 20 reciprocatingly rotates by a predetermined angle.
And the output shaft 30 that reciprocates the louvers and the like is maintained in a predetermined relationship, and the operating characteristics of the louvers and the like are kept constant.

In the above embodiment, only the case where the spring 42 is used as the urging means has been described. However, the present invention is not limited to this case. Various biasing means such as springs can be used.

[0020]

As described above, according to the geared motor according to any one of the first to seventh aspects, the clutch mechanism is connected to the opposing surface of the rotating body and the driven body constituting the clutch mechanism. The convex and concave portions that engage with each other are provided, and furthermore, by providing a slope adjacent to the concave portion, the convex portion can easily enter the concave portion in the range where the slope is formed, and the excessive force applied to the output shaft When the rotational power or the like is released and the rotational power transmission system is reconnected by the clutch mechanism, the relationship between the operating state of the transmission system and the rotational state of the output shaft is reliably returned to a predetermined positional relationship. Can be. In this case, according to the geared motor according to the second aspect, the unnecessary relative rotation of the rotating body and the driven body can be suppressed by the engagement between the concave portion and the convex portion having no slope formed. According to the geared motor described in the item 3, the convex portion can be reliably engaged with the concave portion having the slope.

Furthermore, according to the geared motor of the fourth aspect, the slope is formed adjacent to both sides of the concave portion, so that the formation range is set large, and the convex portion and the concave portion are more reliably engaged. According to the geared motor according to the fifth aspect, by forming an index indicating that the rotating body and the driven body are at the predetermined relative rotating position, the rotating body and the driven body are maintained in a predetermined positional relationship. , They can be easily assembled. According to the geared motor of the sixth aspect, the relationship between the operating state of the link mechanism and the operating state of the louver connected to the output shaft is always maintained in a predetermined relationship, and the operating characteristics of the louver and the like are maintained. According to the geared motor according to the seventh aspect, by using the output body as the rotating body, it is possible to simplify the configuration of the power transmission system by incorporating the output body into the gear train. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating an internal structure of an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a plan view of the ratchet gear shown in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a plan view of the output gear shown in FIG.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is an enlarged sectional view taken along line VII-VII of FIG.

[Explanation of symbols]

 Reference Signs List 1 casing 10 motor output shaft 11, 12 reduction gear 13 first operating gear 14 link member 15 second operating gear 20 output gear (rotating body) 21 support shaft 22 bearing 30 output shaft 40 clutch mechanism 41 ratchet gear (follower) 42 spring (biasing means)

Claims (7)

[Claims] 1. A geared motor for transmitting the rotating power of a motor to a rotating body via a gear train and outputting the rotating power of the rotating body from an output shaft via a clutch mechanism, wherein the clutch mechanism includes the rotating body. Located on the same axis as
A driven body which is provided so as to be rotatable relative to the rotating body and displaceable in the vicinity of the rotating body along a direction facing the rotating body and is connected to the output shaft; Urging means for urging the rotating body and the driven body on one side of a facing surface of the rotating body and the driven body, and the projection provided on the other side of the facing surface of the rotating body and the driven body on the other side. A geared motor comprising: a concave portion engageable with a convex portion; and a slope provided adjacent to the concave portion and guiding the convex portion in the concave portion. 2. The method according to claim 1, wherein the plurality of recesses and the plurality of protrusions are formed in a circumferential direction of the rotating body and the driven body, respectively, and the slope is formed adjacent to at least one of the plurality of recesses. The geared motor according to claim 1, wherein the geared motor is provided. 3. A method according to claim 1, wherein, among the plurality of recesses, those having the slopes formed adjacently have larger inner dimensions than those not having the slopes formed adjacently. Item 3. A geared motor according to item 2. 4. The geared motor according to claim 1, wherein the slope is formed adjacent to both sides of the recess. 5. An apparatus according to claim 1, wherein an indicator is provided at an opposing portion between said rotating body and said driven body to indicate that they are at a predetermined relative rotating position. Geared motor. 6. The geared motor according to claim 1, wherein the gear train has a link mechanism for reciprocatingly rotating the rotating body by a predetermined angle by the rotating power of the motor. . 7. The geared motor according to claim 1, wherein the rotating body is an output gear incorporated in the gear train.