JP2604044Y2 - Clutch device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch device which is used, for example, in a small synchronous motor and intermits transmission of rotational force by sliding friction.

[0002]

2. Description of the Related Art As shown in FIG. 4, for example, a conventional clutch device 22 of a small synchronous motor used for driving an air conditioner rovers wing is provided with a spring washer 24 and a flat washer via a plate 23 for equalizing pressure. 25, the output wheel 26 is sandwiched from both sides to form a friction portion 27.
Are in surface contact, and the transmission of rotational force between the output shaft 28 and the output wheel 26 is intermittently performed by the sliding friction of the surface contact portion of the friction portion 27.

[0003] This type of clutch device 22 is required to have the following clutch performance. That is, (1) the slip torque (dynamic torque) equal to or greater than the louver load torque is maintained, and (2) the torque (static torque) at which the air conditioner starts slipping from the operational feeling when the louver direction is manually operated from outside. The upper limit is regulated.

[0004]

However, in the conventional clutch device 22 described above, (1) the variation in the spring constant of the spring washer and the increase in the number of parts cause a large variation in the torque at the time of assembly, and (2) the friction portion. The static contact increases due to the surface contact, and the difference from the dynamic torque is large. For this reason, there was a problem that the demand for the clutch performance could not be satisfied and the operability of the louver was poor.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and has as its object to provide a clutch device which can satisfy the demand for clutch performance and improve operability such as louvers. Is to do.

[0006]

Means for Solving the Problems The present invention to achieve the object, the output shaft (2), rotatably provided is output wheel to the output shaft (2) and (3), the output shaft (2) It has two spring washers (4a, 4b) that rotate integrally, and the outer peripheral surface of the output shaft (2) is fitted to the inner peripheral surface of the hole (13) at the center of the two spring washers (4a, 4b). As a result, two spring washers (4a, 4b)
Is attached to the output shaft (2) only at the above-mentioned fitting portions in a non-rotating state, and two spring washers (4a, 4a) are attached.
b) the output shaft (2) and rotate integrally, and when the output vehicles (3) was sandwiched from both sides by two spring washers (4a, 4b), the two spring washers (4
a, 4b) are fixed to the output shaft (2) by caulking.
As immovable in the direction, the two spring washers (4
a, 4b) and the output wheel (3) to form a friction clutch. Further, the side surfaces of the output wheel (3) and the outer peripheral edges of the two spring washers (4a, 4b) are brought into contact by circumferential line contact. The frictional parts (5a, 5b) in the circumferential direction are formed in contact with each other, and the output shaft (2) and the output wheel (2) are formed only by the sliding friction of the circumferential line contact parts of these friction parts (5a, 5b). (3) The transmission of the rotational force is intermittently performed.

[0007]

The rotational force is transmitted between the output shaft (2) and the output wheel (3) due to the friction of the line contact portions of the friction portions (5a, 5b). , The output shaft ( 2 ) and two spring washers (4a,
4b), no slip rotation can occur at the fitting portion, and instead the output wheel (3) and the spring washers (4a, 4a)
The transmission of the rotational force is cut off due to the slip of the line contact portions of the friction portions (5a, 5b) between the first and second portions (b). Thus, by the sliding friction of the line contact portions of the friction portions (5a, 5b),
The static torque can be reduced so as to approach the dynamic torque. Further, variations in the spring constant of each spring washer (4a, 4b) can be absorbed, and furthermore, the number of components can be reduced by omitting plates and the like, so that variations in torque during assembly can be suppressed. As a result, the demand for the clutch performance can be satisfied, and the operability of the louver and the like can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 to 3, a clutch device 1 according to the present invention is applied to, for example, a small synchronous motor 15 having a reduction gear mechanism for driving an air conditioner rovers wing. The small synchronous motor 15 includes a motor portion 11 in which a rotor, a motor core, a bobbin, and the like are housed in a motor case 10, and a gear portion 12 in which a reduction gear and the clutch device 1 are built. The clutch device 1 protects the gears in the motor case 10 from an external impact load while maintaining the torque transmitting function of the small synchronous motor 15, and provides safety when a finger or the like is pinched by a louver or the like. It is provided in order to secure functions such as louver operability.

The present invention relates to the clutch device 1 described above.
An output shaft 2, an output wheel 3 rotatably provided on the output shaft 2, and two spring washers 4 a and 4 b rotating integrally with the output shaft 2, and holes at the centers of the two spring washers 4 a and 4 b. 13, the outer peripheral surface of the output shaft 2 is fitted to the inner peripheral surface of the output shaft 2.
a, 4b are attached to the output shaft 2 only at the above-mentioned fitting portions in a non-rotating state, and two spring washers 4a,
4b is rotated integrally with the output shaft 2, and the output wheel 3 is sandwiched from both sides by two spring washers 4a and 4b.
With two spring washers (4a, 4b)
The output shaft (2) cannot be moved in the axial direction by caulking.
As a function, a friction clutch is formed by the two spring washers 4a and 4b and the output wheel 3, and the output wheel 3
Are brought into contact with the outer peripheral edges of the two spring washers 4a, 4b by line contact in the circumferential direction to form circumferential friction portions 5a, 5b, and the circumference of these friction portions 5a, 5b is formed. The transmission of the rotational force between the output shaft 2 and the output wheel 3 is intermittently performed only by the sliding friction of the line contact portion in the direction.

That is, the output shaft 2 includes an output shaft portion 9,
A stepped structure including a large diameter portion 2a and a small diameter portion 2b,
The large diameter portion 2a is rotatably supported by the motor case 10 via a bearing portion, and the output shaft portion 9 projects from the motor case 10 toward the louver. An output wheel 3 is rotatably provided in the small diameter portion 2b in the motor case 10, and the output wheel 3
Has teeth 6 which reduction gear meshes with the final stage on the outer peripheral surface, an annular protrusion 7a, 7b are respectively formed on both sides.

A parallel surface 8 is formed on the outer peripheral surface of the small diameter portion 2b of the output shaft 2, and the holes 1 of the spring washers 4a, 4b are formed.
A cut surface 14 parallel to each other is formed on the inner peripheral surface of the shaft 3, and the small diameter portion 2 b with the parallel surface 8 is fitted into the hole 13 with the cut surface 14 so that the spring washers 4 a and 4 b are integrated with the output shaft 2. And the output wheel 3 can not be moved in the axial direction by caulking when the output wheel 3 is sandwiched from both sides.
I have. As a result, the outer peripheral edges of the spring washers 4a, 4b are elastically pressed against the annular projections 7a, 7b of the output wheel 3, respectively, so that the friction portions 5a, 5b have a ring-shaped line contact in the circumferential direction. I have. Here, the parallel surface 8 and the cut surface 14 are fitted to each other by the outer peripheral surface of the output shaft 2 and the inner peripheral surface of the hole 13 of the spring washers 4a and 4b to prevent rotation in the circumferential direction. Forming a surface.

Next, the operation of this embodiment will be described. When the output wheel 3 is rotated at a reduced speed via the final reduction gear, a rotational force is transmitted from the output wheel 3 to the output shaft 2 by the friction of the line contact portions of the friction portions 5a and 5b. If a load is applied from the outside by the operation of changing the direction of the louver with a finger during the transmission of the rotational force, the transmission of the rotational force is cut off due to slip, that is, sliding friction of the line contact portions of the friction portions 5a and 5b.

As described above, the slipping friction portions 5a, 5a
By changing b from the surface contact to the line contact and making the contact area much smaller, the static torque can be reduced and the dynamic torque can be made closer to the dynamic torque. Also, two spring washers 4
a, 4b, the output wheel 3 is sandwiched from both sides, so that even if the spring constant varies between the spring washers 4a, 4b, the two spring washers 4a, 4b
By facing b and balancing the spring resilience of both, it is possible to absorb variations in torque due to variations in component dimensions.

Further, as shown in FIG.
The plate 23 provided for the purpose of equalizing the pressure at the surface contact portion 7 is not required, so that the number of parts can be reduced, and the variation in the amount of caulking at the time of assembly can be suppressed. Therefore, variation in torque at the time of assembly can be suppressed.
As a result, the demand for clutch performance can be satisfied, and the operability of the louver can be improved.

The present invention is not limited to the above-described embodiment, and it is needless to say that various modifications are possible. For example, in the above-described embodiment, the case where the present invention is applied to a small synchronous motor for driving an air conditioner louver wing is described. The present invention can be applied to a synchronous motor, and further can be applied to a step motor instead of these small synchronous motors.

In the above-described embodiment, the case of transmitting the torque from the output vehicle 3 to the output shaft 2 has been described. However, the present invention is not limited to this.
The present invention can also be applied to the case of transmitting rotational force to Further, the annular projections 7a and 7b are
a, 4b, and flat friction portions 5a, 5b may be formed on the output wheel 3 side. In addition, the annular projection 7
a and 7b may be continuous or discontinuous.

[0017]

[Effects of the Invention] As is apparent from the above description, the present invention has the following effects. That is, (1) the output shaft and the spring washer are fitted only on the outer peripheral surface of the shaft, are securely prevented from rotating in the circumferential direction, and when an excessive load is applied, the line of the friction portion in the circumferential direction is Since the transmission of the rotational force is intermittently performed only by the sliding friction of the contact portion, the torque at the time of breaking is stabilized, and the torque at the time of breaking can be set to a desired value. (2) Since the friction portion in the circumferential direction is a line contact, the static torque can be reduced and the dynamic torque can be made closer to the dynamic friction as compared with the surface contact. (3) output in a state of sandwiching the output wheel from both sides with two spring washers
It is impossible to move in the axial direction by caulking fixed to the axis,
Since the friction clutch is formed, the variation of the spring constant of the two spring washers is absorbed, and the spring resilience of the two spring washers is opposed and balanced, and the number of parts is reduced by omitting parts such as plates. By reducing the number, it is possible to reduce the variation in torque during assembly by reducing the accumulation of component errors during assembly. Moreover, the biasing force of only one side does not act on the output vehicle, and the slip limit is determined only by the pinching force of the two spring washers, that is, the thrust force in the same direction as the shaft, so that the torque at the time of interruption is reduced. Can be regulated accurately. (4) In the section from the center of each spring washer to the friction portion, the spring washer is free to contact other members, and the length from the center of the two spring washers to the friction portion is increased. You can use the power effectively. These (1),
By the effects of (2), (3) and (4), the demand for the clutch performance can be satisfied and the operability of the louver and the like can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a clutch device according to an embodiment.

FIG. 2 is a configuration diagram showing an output shaft.

FIG. 3 is a configuration diagram showing a spring washer.

FIG. 4 is a sectional view showing a clutch device according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clutch device 2 Output shaft 2a Large diameter part 2b Small diameter part 3 Output wheel 4a Spring washer 4b Spring washer 5a Friction part 5b Friction part 6 Tooth part 7a Annular projection part 7b Annular projection part 8 Parallel surface 9 Output shaft part 10 Motor Case 11 Motor part 12 Gear part 13 Hole 14 Cut surface 15 Small synchronous motor 22 Conventional clutch device 23 Plate 24 Spring washer 25 Flat washer 26 Output wheel 27 Friction portion 28 Output shaft

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16D 7/02

Claims (2)

(57) [Scope of request for utility model registration] An output shaft (2), an output wheel (3) rotatably provided on the output shaft (2), and two spring washers (4a, 4b) rotating integrally with the output shaft (2).
By fitting the outer peripheral surface of the output shaft (2) into the inner peripheral surface of the hole (13) at the center of the two spring washers (4a, 4b), the two spring washers (4a,
4b) is attached to the output shaft (2) in the non-rotating state only at the above-mentioned fitting portion, and two spring washers (4) are attached.
a, 4b) to rotate integrally with the output shaft (2), and the output wheel (3) by two spring washers (4a, 4b).
With two spring washers
(4a, 4b) fixed to the output shaft (2) by caulking
A friction clutch is formed by the two spring washers (4a, 4b) and the output wheel (3) so as not to move more in the axial direction . Further, the side surface of the output wheel (3) and the two spring washers (4a, 4b) Are brought into contact with each other by a line contact in the circumferential direction, so that the circumferential friction portions (5a, 5a,
b), and the transmission of rotational force between the output shaft (2) and the output wheel (3) is interrupted only by the sliding friction of the circumferential line contact portions of these friction portions (5a, 5b). A clutch device (1) characterized in that: 2. An output shaft (2), an output wheel (3) rotatably provided on the output shaft (2), and two spring washers (4a, 4b) rotating integrally with the output shaft (2).
By fitting the outer peripheral surface of the output shaft (2) into the inner peripheral surface of the hole (13) at the center of the two spring washers (4a, 4b), the two spring washers (4a,
4b) is attached to the output shaft (2) in the non-rotating state only at the above-mentioned fitting portion, and two spring washers (4) are attached.
a, 4b) to rotate integrally with the output shaft (2), and the output wheel (3) by two spring washers (4a, 4b).
With two spring washers
(4a, 4b) fixed to the output shaft (2) by caulking
A friction clutch is formed by the two spring washers (4a, 4b) and the output wheel (3) so as not to move more in the axial direction . Further, the side surface of the output wheel (3) and the two spring washers (4a, 4b) Are brought into contact with each other by a line contact in the circumferential direction, so that the circumferential friction portions (5a, 5a,
b), the output wheel (3) and two spring washers (4a, 4a) in the friction portions (5a, 5b).
b) an annular projection (7) on one of the opposing surfaces.
a, 7b), and transmission of rotational force between the output shaft (2) and the output wheel (3) only by the sliding friction of the circumferential line contact portions of these friction portions (5a, 5b). (1).