JP2003130114A - Rotary oil damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small damper capable of generating in stepwise manner, a large torque, with smooth operation at the start of braking. SOLUTION: A stationary disc 10 secured to a casing 1 and a rotatable rotary disc 6 are alternately laminated with a viscous oil G in between. A spindle 13 penetrates loose engagement holes 7 and 11, formed at the centers of the stationary disc and the rotary disc. The rotation force of the spindle is transmitted sequentially to the rotary disc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil damper for slowly moving a moving body that is urged in one direction and moves in a linear direction or a rotational direction, against the urging force. The present invention relates to a rotary oil damper that is small in size and capable of generating a large rotary torque.

[0002]

2. Description of the Related Art A movable body that reciprocates in a linear direction such as a slide holder of a floppy (registered trademark) disk or a slide type ashtray of an automobile, and a movable body that rotates around a spindle as an opening / closing lid of a cassette tape recorder. Etc.
It is biased in the opening direction by a return spring or the like, and when unlocked, the moving body vigorously moves or rotates in the opening direction by the restoring force of the return spring or the like.

In order to prevent this, conventionally, a rotary oil damper 31 as shown in FIG. 9 is used, and its gear 32 is meshed with a gear or rack or the like mounted on a slide holder or an opening / closing lid to return spring. The braking force is damped by utilizing the viscous resistance of the grease G filled in the damper to dampen the urging force due to the restoration of the.

[0004]

However, in the conventional rotary oil damper 31 shown in FIG. 9, due to the viscous resistance of the grease G interposed between the rotor 33 and the stator 34 and the cylindrical portions 33a, 34a of both, Since the rotor 33 is configured to generate a torque that attenuates the urging force of the moving body, in order to obtain a large torque, it is necessary to increase the contact area of the cylindrical portions 33a and 34a with the grease G. .

However, this type of rotary oil damper used in the above-mentioned places is often installed in a relatively narrow space in relation to other parts mounted on the device to be mounted, and thus is downsized. There is. Therefore, the area of each of the cylindrical portions 33a and 34a of the damper 31 is naturally small, and as a result, the magnitude of the rotational torque generated in the rotor 33 has a certain limit.

Therefore, in the case of a slide holder of a floppy disk, a slide type ashtray of an automobile, or an opening / closing lid of a cassette tape recorder, since a relatively weak return spring is used, there is no problem. When a large urging force is applied due to the weight of the blind like the rotating shaft for unloading, it is necessary to absorb and brake this large urging force especially at the time of unloading. However, in the conventional damper as described above, the area of each cylindrical portion 33a, 34a must be increased,
There is a problem that the whole becomes large and cannot be used.

Further, since the rotary oil damper brakes the movement of the moving body by viscous resistance of grease or the like filled in the damper, it is suitable for a device to be mounted in a severe cold environment. When installed, the viscosity of grease becomes high and the viscosity resistance becomes large. As a result, there has been a problem that the torque value of the rotor becomes abnormally large and the operation at the time of start is not performed smoothly.

[0008]

The present invention has been made in order to solve the above-mentioned conventional problems, and is capable of sufficiently resisting a large urging force of a moving body without increasing the size of the whole. The purpose of the present invention is to provide a torque that can generate a possible torque and to smoothly perform the operation at the start of braking. When a disc and a plurality of rotatable discs that are rotatable are alternately laminated with viscous oil interposed between them, a rotating shaft that penetrates the loose fitting holes formed in the centers of these fixed disc and rotating disc. And a structure in which torque that gradually increases from the minimum torque to the maximum torque is generated in the rotating shaft by sequentially transmitting the rotational force of the rotating shaft to the plurality of rotating disks. Rotating oy In the damper or the like.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The rotary oil damper according to the present invention will be described in detail below with reference to the embodiments shown in the drawings. In FIGS. 1 to 5, 1 is a cylindrical casing, and 4 is the inside of the casing 1. The lid member is attached so that the viscous oil such as grease filled in is not leaked to the outside. 6 and 6A are rotating discs, 10 is a fixed disc, and the rotating discs 6 and 6A and the fixed disc 10 are in the casing 1 and extend from the bottom wall portion 1a toward the lid member 4 direction. The rotating discs 6A are arranged alternately, and the rotating discs 6A are located on the bottom wall 1a side, and the rotating discs 14 fixed to the rotating shaft 13 are located on the lid member 4 side.

Reference numerals 7 and 11 denote loose fitting holes formed at the centers of the rotating discs 6, 6A and the fixed disc 10, respectively, and the upper and lower sides of the plurality of rotating discs 6, 6A and the fixed disc 10 which are alternately laminated. The rotary shaft 13 having a diameter smaller than the inner diameter thereof penetrates through the loose fitting holes 7 and 11 aligned in the direction, and the lower end of the rotary shaft 13 has a bearing recess 2 formed in the bottom wall 1a.
The upper part is rotatably supported around the through hole 5 formed in the center of the lid member 4.

Numeral 8 is an upright projection that stands in the loose fitting holes 7 of the rotary discs 6 and 6A and stands up from the peripheral edge thereof, and reference numeral 9 is a hanging projection that also hangs downward from the peripheral edge of the free fitting hole 7, respectively. Are formed at opposing positions in the radial direction, and the upstanding projections 8 and the depending projections 9 are provided in the loose fitting holes 11 of the fixed discs 10 located above and below the rotary disc 6, respectively. A gap 1 between the fitting hole 11 and the outer peripheral surface of the rotary shaft 13
Located within 6 respectively.

Numeral 12 is a fitting protrusion projecting from the peripheral edge of the fixed disc 10, and four fitting protrusions 12 are formed in the circumferential direction of the fixed disc 10 at intervals of 45 °. By fitting in the concave groove 3 extending in the axial direction of the rotary shaft 13 on the inner peripheral surface of 1, the fixed discs 10 are installed in the casing 1 such that they cannot rotate. There is. Reference numeral 15 is a downward protrusion provided on the lower surface of the rotating disc 14 fixed to the rotating shaft 13,
Is formed on a base of the rotary shaft 13 which is attached to the rotary shaft 13, and the lower projection 15 is located at the lower part of the uppermost fixed disk 10.
It is located ₁ loosely fit hole 11 and the gap 16 between the rotary shaft 13.

[0013] In assembling the components of the, first, into the casing 1, darken without rotating disk 6A with hanging protrusions 9, thereon, a fixed disc 10 ₄ and the fitting protrusion 12 casing 1 and the concave groove 3 of 1 are aligned and dropped. Then, the rotary disc 6 ₃ and the fixed disc 10 ₃ are dropped onto the fixed disc 10 ₄ in this order, and by repeating this operation, the rotary disc 6 and the fixed disc 10 ₃ are repeated.
And are laminated alternately.

Then, the rotary shaft 13 is inserted from the lower end thereof into the loose fitting holes 7 and 11 of the laminated rotary discs 6 and 6A and the fixed disc 10 which are aligned with each other. Bearing recess 2 formed in the bottom wall 1a of the casing 1
By inserting up to the lower surface of the rotary shaft 13 rotating disk 14 fixed to is placed in a position facing the upper surface of the fixed circular plate 10 ₁ of the top-level. After that, by closing the opening of the casing 1 with the lid member 4, the upper end of the rotary shaft 13 penetrates the through hole 5 and projects to the outside, and is assembled in the state shown in FIGS. It is needless to say that the viscous oil G is filled in the casing 1 at the time of this assembly.

As a result, when the fixed disks 10 ₁ to 10 ₄ are fixed to the casing 1 so as not to rotate, the upper and bottom wall portions 1 a of the fixed disks 10 ₂ to 10 ₄ are also fixed. Rotating discs 6 _{1 to} 6 ₃ respectively located on the upper part of the
And the standing protrusions 8 ₁ to 8 ₄ of 6A respectively correspond to the rotating discs 6 ₁ to
63. The fixed disk 1 located above ₃ and 6A, respectively.
The gap 1 between the loose fitting hole 11 of 0 ₁ to 10 ₄ and the rotating shaft 13
6, on the other hand, the hanging protrusions 9 _{1 to} 9 of the rotating discs 6 _{1 to} 6 _3.
3 are respectively located in the gaps 16 between the loose fitting holes 11 of the fixed discs 10 ₂ to 10 ₄ and the rotary shaft 13 which are located below the rotary discs 6 _{1 to} 6 ₃ and 6 A, respectively. Further, the lower projection 15 formed on the mounting base portion of the rotary disk 14 is a loose fit hole 11 of the fixing disc 10 ₁ located in the uppermost layer rotary shaft 1
It is located in the gap 16 with the No. 3.

Next, the operation of the rotary oil damper having the above-described structure will be described with reference to FIG. 6 in which the rotary shaft 13 receives a rotational force in the clockwise direction (right rotation direction) and rotates in the same direction.
Will be described with reference to. 4A shows the same state as that shown in FIG. 4 before the start of operation. When the rotary shaft 13 and the rotary disk 14 fixed to the rotary shaft 13 respectively rotate to the right from this state, As shown in FIGS. 2B and 2C, the lower projection 15 hanging from the mounting base of the rotary disc 14 is also located below the fixed disc 10.
Gap 16 between the _first loosely fit hole 11 and the rotary shaft 13 (hereinafter, the gap 16 hereinafter) inside rotate in the same direction.

[0017] In the meantime, the the rotation shaft 13, the de minimis torque by the viscous resistance of the viscous oil G interposed between the lid member 4 and the rotating disc 14 and the rotary disc 14 and the fixed circular plate 10 ₁ However, the moving body smoothly moves in the opening direction by the urging force of the return spring or the like. When the rotary shaft 13 rotates about 300 degrees, the lower protrusion 15
Moves in the gap 16 to the position shown in FIG.
The lower protrusion 15 collides with the upstanding protrusion 8 ₁ of the rotating disc 6 ₁ located in the gap 16 of the fixed disc 10 ₁ , and rotates the rotating disc 6 ₁ in the same direction.

As a result, on the rotary shaft 13, the lid member 4 and the rotary disk 14, and the rotary disk 14 and the fixed disk 10 are provided.
₁ , the fixed disk 10 ₁ , the rotating disk 6 _1, and the rotating disk 6
The viscous resistance of the grease interposed between the ₁ and the fixed circular plate 10 _2, slightly larger rotational torque is generated than if the shown in (b) and FIG. (C). Then, from the state shown in FIG. 3D, the rotary shaft 13, the lower protrusion 15,
When the rotating disc 14, 6 ₁ is rotated about 300 degrees, respectively,
As shown in FIG. (E), and it strikes the upright projection ₈₂ of the rotary disk 6 ₂ hanging projections 9 ₁ of the rotary disc ₆₁ is positioned in the gap 16 of the fixed disc 10 _2, rotation the disc 6 ₂ allowed to rotate in the same direction.

As a result, a larger rotational torque is generated on the rotary shaft 13 than in the state shown in FIG. Then, further drawing (e) to the rotary shaft 13 from the state shown, the lower protrusion 15, the rotary disk 14, 6 _1, 6
_{When 2} rotates about 300 degrees, as shown in FIG.
The hanging protrusion 9 ₂ of the rotary disc 6 ₂ is strikes the upright projection 8 ₃ of the rotating disc 6 ₃ located in the gap 16 of the fixed disc 10 _3, allowed to rotate the rotary disc 6 ₃ in the same direction Therefore, a larger rotating torque is generated on the rotating shaft 13.

Further, from the state shown in FIG. 3F, the rotary shaft 13, the lower projection 15, the rotary discs 14, 6 ₁ , 6 are arranged.
When _{2, 6 3} is rotated about 300 degrees, respectively, and FIG. (G)
As shown in FIG. 5, the hanging protrusions 9 ₃ of the rotating disc 6 ₃ abut the upstanding protrusions 8 ₄ of the rotating disc 6 A located in the gap 16 of the fixed disc 10 ₄ so that the rotating disc 6 ₃ is not moved. The maximum torque is generated on the rotating shaft 13 because it is rotated in the direction.
That is, a gradually increasing rotational torque is gradually generated on the rotary shaft 13, and thereafter, the rotary shaft 13 operates in a state in which the maximum torque shown in FIG.

Therefore, for example, when the present damper is used for the rotary shaft for winding up and down the blind, even when the rotating shaft 13 is subjected to a large biasing force due to the dead weight of the blind, the blind is initially lowered. You will get off early and then slowly.

Contrary to the above, FIGS. 7 (a) to 7 (g) show the operating state when the moving body is moved in the closing direction. In the state shown in FIG. 7 (a), the moving body is opened. This is the same as the state shown in FIG. From this state, if you push the moving body by hand and move it in the closing direction,
As shown in (b) and (c) of FIG.
The rotating disk 14 and the lower protrusion 15 rotate in the counterclockwise direction (counterclockwise rotation direction), and as shown in FIG.
When the 3 rotates about 300 degrees in the same direction, the lower protrusion 15
There was impinged with upright projections ₈₁ of the rotary disk _61, rotating disk ₆₁
Rotate in the same direction.

In the meantime, the lid member 4 is attached to the rotary shaft 13 as in the case shown in FIGS. 6 (b) and 6 (c).
Insignificant torque by viscous resistance of the grease present between the rotating disc 14 and the rotary disc 14 and the fixed circular plate 10 ₁ generates only, to move the moving body in the closing direction, the return spring It is sufficient to apply a biasing force such as the above and a force large enough to overcome the slight torque. Therefore, for example, when a large biasing force is applied due to the dead weight of the blind, such as a rotary shaft for winding up a blind, or when the viscous resistance of viscous oil is large in a severe cold environment. But you can wind it up with a relatively small force.

[0024] Then, by rotating about 300 degrees the rotation shaft 13 further to the left rotation direction, FIG. (E), the hanging protrusions 9 ₁ of the rotary disk ₆₁ is of the rotary disk 6 ₁ and strike the upright projection ₈₂ of the rotary disk 6 ₂ in the lower layer, allowed to rotate the rotary disc 6 ₂ in the same direction. In this way, the every time the rotary shaft 13 through approximately 300 degrees to the left rotational FIG (f), (g), the rotary disc is in the lower layer of the rotating disk 6 ₂ 6
_3, 6 ₄ are sequentially rotated, rotating disc 6 ₄ so that the maximum torque is generated in the rotary shaft 13 at the stage of rotation. However, by the time this maximum torque is generated,
Since the run-up in the direction of rotation and the inertial force are generated on the rotary shaft 13, the torques are offset and the rotary shaft 13 can be rotated without difficulty.

FIG. 8 is a sectional view showing a main part of a rotary oil damper according to another embodiment of the present invention, and the structure of the rotary disc 6 and the fixed disc 10 shown in particular is a characteristic thereof. . That is, the rotating disk 6 and the fixed disk 10 are configured such that a large number of concentric annular grooves 6B and 10B are formed on both front and back surfaces thereof, whereby the viscous liquid G of each rotating disk 6 and the fixed disk 10 is formed. The contact area with the rotary shaft 13 increases.
Therefore, a larger torque can be generated.

As described above, according to the rotary oil damper of this embodiment, since the viscous oil G is interposed between the rotary disc 6 and the fixed disc 10, the concentric circular cylinders are arranged. Compared with the conventional one in which the viscous liquid G is interposed between the parts 33a and 34a, the contact area with the viscous oil can be remarkably increased. For example, like a rotary shaft for winding up and down the blind Even when a large urging force acts, a torque large enough to overcome this can be generated.

Further, in the present invention, the magnitude of the torque generated can be freely controlled by increasing or decreasing the number of the rotary discs 6 and the fixed discs 10. 10 has a thin wall thickness,
Since the viscous liquid G is interposed between the circular plates 6 and 10 by alternately laminating the viscous liquid G and the viscous resistance of the viscous liquid G generates torque on the rotating shaft 13, the entire damper can be made thin. However, even if the number of these discs is increased to increase the torque, the entire size does not increase.

Further, when the rotary shaft 13 is rotated by a predetermined angle, the rotational force of the rotary shaft 13 is sequentially transmitted to the plurality of rotary discs 6, so that a small torque is generated at the start of operation. It starts in the state of being braked by, and thereafter, it is braked with a gradually increasing torque. Therefore, even if the viscous resistance of viscous oil increases in a low temperature environment, the initial operation of the moving body is smooth,
The blind can be slowly lowered even when a large biasing force due to the dead weight of the blind acts on the rotary shaft for winding and lowering the blind, for example.

In the present invention, in the above embodiment, the rotational angles of the rotational force of the rotary shaft 13 transmitted to the respective rotary discs 6 are set to about 300 °, but the present invention is not limited to this. By changing the positions and the numbers of the upright projections 8 and the depending projections 9, the timing of maximum torque generation can be advanced or delayed, and can be freely adapted to the place of use.

[0030]

The rotary oil damper according to the present invention is
With the above-described configuration, a large torque can be generated without increasing the size of the whole. Moreover, since the torque gradually increases each time the rotating shaft rotates by a predetermined angle, the initial operation of the moving body can be smoothly performed even in a low temperature environment. Further, since the braking force that gradually increases thereafter is exerted, even a heavy object such as a blind can suppress the occurrence of impact when it descends. In addition, when annular grooves in the circumferential direction are formed on the front and back surfaces of the fixed disk and the rotating disk, the contact area between the fixed disk and the viscous oil of the rotating disk increases, and a larger torque is generated. There are various effects that can be made.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a rotary oil damper according to the present invention.

FIG. 2 is a front view showing a state where the damper is assembled.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

5 is a sectional view taken along line CC of FIG.

FIG. 6 is a first action explanatory diagram showing a relationship between a rotary shaft and a rotary disc during operation of the damper.

FIG. 7 is a first action explanatory view showing a relationship between a rotary shaft and a rotary disc during operation of the damper.

FIG. 8 is a sectional view showing a main part of a damper according to another embodiment of the present invention.

FIG. 9 is a sectional view of a conventional rotary oil damper.

[Explanation of symbols]

1 casing 3 concave groove 4 Lid member 6,6A, 14 Rotating member 7, 11 Free fitting hole 8 Standing protrusions 9 Drooping process 10 fixed disk 12 Fitting protrusion 13 rotation axis 15 downward protrusion 16 gap G viscous oil

Claims (4)

[Claims] 1. When a plurality of fixed discs fixed to a casing and a plurality of rotatable discs are alternately laminated with viscous oil interposed therebetween, the fixed discs and the rotary discs are A rotating shaft penetrating a loosely fitting hole formed in the center, and by sequentially transmitting the rotating force of the rotating shaft to the plurality of rotating discs, the rotating shaft is gradually stepped from a minimum torque to a maximum torque. A rotary oil damper that is configured to generate a large torque. 2. The rotating disc includes a rising protrusion standing upright from a peripheral edge of the loose fitting hole and a hanging protrusion hanging downward, and the rising protrusion of the rotating disc droops a rotating disc of an upper layer. The projection and the hanging projection are configured to engage with the upstanding projection of the lower rotary disk through the gap between the loose fitting hole of the upper and lower fixed disks and the rotary shaft, respectively.
The described rotary oil damper. 3. The fitting wherein the casing has a concave groove extending in the axial direction of the rotary shaft on the inner peripheral surface thereof, and the fixed disc fits into the concave groove protruding from the peripheral edge thereof. 3. A projection and a projection, respectively.
The described rotary oil damper. 4. The fixed disk and / or the rotating disk are provided with concentric annular grooves on the surface.
Alternatively, the rotary oil damper described in 3.