JPH112278A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary damper to perform stable opening and closing, reliably stop in an arbitrary position, perform gentle closing operation in a final position, further comparatively simplify structure, and be excellent in productivity. SOLUTION: A rotary damper comprises a spring damper 10 formed such that the clutch spring rotation parts 13 of first and second rotation members 11 and 12 are interconnected in an abutment state, coil springs are wound in a reverse direction to each other around a clutch spring rotation part and a limiter spring rotation part 15, torque is transmitted on rotation for a winding direction, and no torque is transmitted on rotation for an unwinding direction; and a grease damper member 20 to fit in the spring damper 10, and to be filled an internal part with grease such that only the outer periphery of a grease damper part 17 is coated with grease. A grease damper is also used jointly with the spring damper 10 by fitting the spring damper 10 in the grease damper member 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper using both a spring damper and a grease damper. More specifically, the present invention relates to a cover such as a copy machine, a notebook type word processor, a notebook type personal computer, etc. The present invention relates to a rotary damper as a rotating power control device for a rotating shaft of a rotating shaft, an ordinary door, a trunk of a passenger car, or the like, which opens and closes.

[0002]

2. Description of the Related Art A conventional rotary damper used for a vertical opening / closing member of a copying machine or the like is configured to transmit torque for rotation in a winding direction and not transmit torque for rotation in a loosening direction. A so-called spring damper in which a clutch spring is wound around a rotating portion is known. Further, there has been known a combined rotary damper including a spring damper and a grease damper, in which grease is attached between a hollow rotary shaft receiving an action of a clutch spring and an outer case.

[0003]

However, when the opening / closing member is stopped at a certain angle, the above-mentioned known rotary damper does not easily fall by holding the stop position. Exceeds the resilience, cannot function as a rotary damper, and the closing speed of the opening / closing member drops. Due to this action, there is a problem in that there is a risk that the hand may be caught between the opening / closing member and the main body, and that the opening / closing member and the main body may be damaged. This has become an even more important issue due to the enforcement of the PL law.

In view of the above problems, when the opening and closing member is opened and closed, stable opening and closing can be obtained, the opening and closing member can be stopped at an arbitrary position, and a gentle closing operation can be obtained at the closing final position of the opening and closing member. It is an object of the present invention to provide a new rotary damper, and to provide a rotary damper that is relatively simple in structure and high in productivity.

[0005]

In order to achieve the above object, a rotary damper according to the present invention comprises a first rotating member comprising a clutch spring rotating portion, and a clutch spring having the same diameter as the first rotating member. A second rotating member including a rotating portion, a limiter spring rotating portion, and a grease damper portion. Coil springs are wound around the clutch spring turning portion and the limiter spring turning portion in opposite directions so that torque is transmitted for rotation in the winding direction and torque is not transmitted for rotation in the loosening direction. And the spring damper can be fitted to the spring damper,
A grease damper member is filled with grease so that grease is applied only to the outer periphery of the grease damper portion of the spring damper, and the spring damper is configured to be fitted into the grease damper member. And a combined grease damper.

[0006] The clutch spring rotating portion is provided inside the limiter spring rotating portion. In addition, a clutch spring having a small wire diameter is wound around the clutch spring rotating portion, and a limiter spring having a large wire diameter is wound around the limiter spring rotating portion. An unwound portion is provided on the clutch spring, and the unwound portion faces the abutting portion of the first rotating member and the clutch spring rotating portion of the second rotating member.

[0007] The grease damper member has an inner box having an inner diameter larger than the outer diameter of the outer rotating portion of the spring damper, and a small-diameter rotating device connected to the inner rotating portion and the rotating shaft of the spring damper. And the spring damper can be fitted therein, and the grease is applied only to the outer periphery of the grease damper portion, and the spring damper is inserted into the grease damper member. By doing so, a grease damper is configured.

The grease damper portion of the spring damper is provided with grease leakage prevention rings at both inner and outer ends. Further, the grease damper portion is partially cut to provide a grease reservoir. Further, the grease is highly adhesive.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. The rotary damper of the present invention includes a spring damper 10 and a grease damper 20. The spring damper 10 uses two types of spring coils, a clutch spring 14 having a small wire diameter and a limiter spring 16 having a large wire diameter, and includes a first rotating member 11 and a second rotating member 12. Become. The first rotating member 11 meshes with a clutch spring rotating portion 13, a flange portion 18 for colliding with an outer box 21 of a grease damper described later, and a gear 31 provided on an opening / closing lid (not shown) as an opening / closing member. It is composed of a tip portion provided with a gear 19 that can be used. on the other hand,
The second rotating member 12 has a clutch spring rotating portion 13 having the same diameter as the first rotating member 11, and has a larger diameter than the clutch spring rotating portion 13 and is positioned outside the clutch spring rotating portion 13. And the outer box 21 of the grease damper member 20 to be described later.
Grease damper part 1 having an outer diameter substantially the same as the inner diameter of
And 7 are integrated. In the present embodiment, the wire diameter of the clutch spring 14 is small, and the wire diameter of the limiter spring 16 is large. However, the present invention is not limited to this.
Although the limiter spring rotating portion 15 is provided on the outside,
This is not a limitation. Further, in order to prevent the clutch spring 14 from intervening in the butting portion,
An unwound portion 14a is provided on the clutch spring 14, and the unwound portion 14a is connected to the first rotating member 11 and the second rotating member 12a.
The clutch spring rotating portion 13 is positioned facing the abutting portion.

Therefore, the clutch spring rotating portion 13 of the first rotating member 11 is brought into contact with the clutch spring rotating portion 13 of the second rotating member 12 having the same diameter as the clutch spring rotating portion 13 so that the clutch spring 14 having a small wire diameter is formed. A limiter spring 16 having a large wire diameter is wound around the limiter spring rotating portion 15 of the second rotating member 12. Moreover, since the winding directions of the clutch spring 14 and the limiter spring 16 are configured to be opposite to each other, the clutch spring 14 and the limiter spring 16 transmit torque in the winding direction and do not transmit torque in the loosening direction.

The grease damper member 20 is provided in the outer box 2 having an inner diameter larger than the outer diameter of the limiter spring rotating portion 15.
1 and a small-diameter rotating portion 22 having an outer diameter substantially the same as the inner diameter of the clutch spring rotating portion 13, and the spring damper 10 is fitted into the first rotating member 11. When the flange 18 and the outer box 21 of the grease damper member 20 abut against each other, the connecting portion 23 is provided so as to be in contact with the tip of the grease damper portion 17 of the second rotating member 12. Then, the outer box 21 and the small-diameter rotating part 22 are connected.

In the present embodiment, when the spring damper 10 is fitted, grease leakage prevention rings 25 and 26 are provided inside and outside a grease damper portion 17 provided at a side end where the spring damper 10 is fitted, respectively. Connecting part 2
The grease 24 is filled between the grease leakage prevention rings 25 and 26 through the grease 24. Also, the grease damper unit 1
7 is partially cut away to provide a grease reservoir 27 for storing grease 24. Note that the grease 24 is preferably a strong adhesive.

The spring damper 10 constructed as described above is fitted into the grease damper member 20, and the center shaft 1 is passed through the spring damper 10, and the grease damper member 20 is attached to, for example, the main body of office equipment, and the first rotation is performed. The member 19 can be used by engaging the gear 19 with the gear 31 provided on the opening / closing lid. Next, the operation of the rotary damper thus configured will be described.

First, the operation when the opening / closing lid is opened will be described. In this case, the direction in which the gear 19 rotates is against the gravity, so that when the cover is opened, the clutch spring 14 is loosened.
Rotates, the clutch spring 14 rotates in the loosening direction. Due to the loosening of the clutch spring 14,
The idling torque acts on the clutch spring 14, and the first rotating member 11 and the second rotating member 12 are no longer connected to each other,
The second rotation member 12 does not rotate. Further, since the grease damper 20 is not provided continuously with the first rotating member 11, the grease damper 20 does not operate. By these actions, the opening / closing lid can be opened with a small force, and the unit can receive the weight and can operate the opening / closing side with a small force.
Also, the clutch spring 14 and the limiter spring 1
6. Since the winding direction is opposite to that of the clutch spring 14, the clutch spring 14 and the limiter spring 16
Tightens the respective rotating parts 13 and 15, so that the rotation can be stopped at an arbitrary position.

Next, the operation when the opening / closing lid is closed will be described. In this case, since the direction in which the gear 19 rotates is the same as the direction of gravity, when the opening / closing lid is closed, the clutch spring 14 is tightened in the tightening direction. To rotate. When the clutch spring 14 tightens the clutch spring rotating portions 13 of the first rotating member 11 and the second rotating member 12, the first rotating member 11 and the second rotating member 12 rotate in the same direction. . On the other hand, since the winding directions of the clutch spring 14 and the limiter spring 16 are opposite, as described above, the limiter spring 16 acts in the loosening direction, and the limiter spring 16 and the limiter spring rotating portion 15 of the second rotating member 12 The first rotating member 11 that rotates integrally with the second rotating member 12 rotates with a resistance between the first rotating member 11 and the second rotating member 12. further,
The grease damper member 20 includes the second rotating member 12 and the grease 2
4, the viscous resistance of the grease 24 acts between the second rotating member 12 and the grease damper member 20 when the second rotating member 12 rotates, and the spring damper 10 Rotates with resistance. By such an operation, the opening / closing lid can be closed with resistance.

[0016]

The rotary damper of the present invention is a three-way rotary damper in which a grease-coated grease damper member is fitted into a spring damper wound with two springs, a clutch spring and a limiter spring. Therefore, especially when the opening / closing member is nearly horizontal, the repulsive elastic force of the clutch spring and the limiter spring and the viscous resistance of grease are applied in the opposite direction of gravity, so that the gentle closing operation of the opening / closing member at the final closing position is performed. can get. Conversely, when the opening / closing member is opened, there is no viscous resistance due to grease, so that the opening / closing member can be easily opened.

Further, the three-way rotary damper is constructed by fitting a grease damper member coated with grease into a spring damper wound with two springs, a clutch spring and a limiter spring, as described above. However, since it is structured to fit a 2-way spring damper into the grease damper member,
Since the structure is relatively simple and the miniaturization is easy, there is an effect that an inexpensive high-performance spring clutch which is excellent in productivity and can transmit a stable torque can be provided.

Further, since grease leakage prevention rings are provided at both ends of the portion filled with grease, it is possible to prevent grease from being applied to the clutch spring, the limiter spring and the rotating shaft, and to prevent the grease from being applied. By providing the grease reservoir in the portion filled with the grease, it is not necessary to replenish the grease, and as a result, there is an effect that the durability is excellent.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a rotary damper of the present invention.

FIG. 2 is an exploded perspective view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Central axis 10 Spring damper 11 First rotating member 12 Second rotating member 13 Clutch spring rotating portion 14 Clutch spring 14a Elementary winding portion 15 Limiter spring rotating portion 16 Limiter spring 17 Grease damper portion 19 Gear 20 Grease damper member Reference Signs List 21 outer box 22 small-diameter rotating part 23 connecting part 24 grease 25, 26 grease leakage prevention ring 27 grease reservoir

Claims (8)

[Claims] 1. A first rotating member comprising a clutch spring rotating portion, and a second rotating member comprising a clutch spring rotating portion, a limiter spring rotating portion and a grease damper portion having the same diameter as the first rotating member. A clutch spring rotating portion of the first rotating member and the second rotating member are abutted and connected to each other, and the coil spring rotating portion and the limiter spring rotating portion are coiled in opposite directions, respectively. And a spring damper configured to transmit torque for rotation in the winding direction and not transmit torque for rotation in the loosening direction, and to fit the spring damper. A grease damper member filled with grease so that grease is applied only to the outer periphery of the grease damper portion of the spring damper; A grease damper configured by fitting a pulling damper into the grease damper member. 2. The rotary damper according to claim 1, wherein said clutch spring rotating portion is provided inside said limiter spring rotating portion. 3. The rotary damper according to claim 1, wherein a clutch spring having a small wire diameter is wound around said clutch spring rotating portion, and a limiter spring having a large wire diameter is wound around said limiter spring rotating portion. 4. The clutch spring according to claim 1, further comprising an unwound portion facing the abutting portion between the first rotating member and the clutch spring rotating portion of the second rotating member. 3. The rotary damper according to any one of 3. 5. An outer box in which the grease damper member has an inner diameter larger than the outer diameter of the outer rotating part of the spring damper, and a small diameter connected to the inner rotating part and the rotating shaft of the spring damper. The rotary damper is formed integrally with the rotating part, the spring damper can be fitted therein, and the grease is applied only to the outer periphery of the grease damper part. 2. A grease damper is formed by fitting into a grease.
A rotary damper according to any one of claims 1 to 4. 6. The rotary damper according to claim 1, further comprising grease leakage prevention rings at both inner and outer ends of the grease damper portion of the spring damper. 7. The rotary damper according to claim 1, wherein the grease damper part is partially cut to provide a grease reservoir. 8. The rotary damper according to claim 1, wherein the grease has a strong adhesiveness.