JPH0510836U - Rotation damper device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the rotor from rubbing against the inner surface of the housing, increasing the frictional force, and exceeding the braking force set at the time of design. [Structure] A hollow inner rotor 7 and a housing 4 which are rotatably fitted inside and outside, and a viscous oil 9 is interposed in a fitting gap 8 therebetween, and a hollow inside 7 ′ of the inner rotor is provided outside the housing. The protruding inner and outer rotating shafts 6, the first collar 11 that rotates integrally with the inner and outer rotating shafts, the second collar 12 that rotates integrally with the inner rotor, and both ends on the outer circumferences of the first and second collars, respectively. Wound coil spring 1
3, and a small projection 7a 'is formed on the lower wall of the inner rotor facing the bottom wall of the housing to separate the lower wall of the inner rotor from the bottom wall of the housing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil-type rotary damper device having a built-in clutch mechanism, and is used, for example, for braking the opening / closing of a dust cover rotatably attached to a record player or a CD player in one direction. ..

[0002]

[Prior Art]

 Conventionally, as a rotary damper device of this type, according to Japanese Utility Model Laid-Open No. 59-121536, a housing having a bottom portion, a clutch plate rotatably accommodated in the bottom portion of the housing via viscous oil, and this clutch are disclosed. A first tooth portion provided on one surface of the plate, a rotary plate having a second tooth portion that meshes with the first tooth portion by rotation in one direction, and a rotary plate integrally formed with the rotary plate It is publicly known that it has a rotating shaft protruding to the outside.

[0003]

[Problems to be solved by the device]

 However, in the above-described conventional rotary damper device, the clutch plate may be in close contact with the inner surface of the outer casing, and a large friction force may inadvertently act on the rotating clutch plate. If such a phenomenon occurs, the braking force set at the time of design will be exceeded, and smooth operation will not be possible.

[0004]

[Means for Solving the Problems]

 Therefore, the present invention is to solve the above-mentioned problems, and comprises a hollow inner rotor and a housing that are rotatably fitted inside and outside, and viscous oil intervenes in the fitting gap between them. Has a built-in inner / outer rotating shaft projecting outside the housing and a one-way clutch mechanism for transmitting rotation in only one direction between the inner / outer rotating shaft and the inner rotor, and the inner side facing the bottom wall of the housing. It is characterized in that a protrusion is formed on the lower wall of the rotor to separate the lower wall of the inner rotor from the bottom wall of the housing.

[0005]

[Action]

 When the inner and outer rotary shafts rotate in one direction, the one-way clutch mechanism transmits the rotational force, and the resistance of the viscous oil present in the fitting gap between the inner rotor and the housing brakes the rotation of the inner and outer rotary shafts. .. At this time, a predetermined gap is secured between the bottom wall of the housing and the lower wall of the inner rotor by the projection, and the viscous oil is filled in the gap, so that the inner rotor closely contacts the bottom wall of the housing. Therefore, a stable braking force can be obtained without causing an unreasonable frictional force. On the other hand, when the inner and outer rotary shafts rotate in the opposite direction, the one-way clutch mechanism does not transmit the rotational force, so the inner and outer rotary shafts rotate freely.

[0006]

【Example】

 The present invention will be described below based on the embodiments shown in the drawings. In the figure, reference numeral 1 denotes a rotary damper device, and as shown in FIG. 2, for example, it is used for damping the closing movement of a dust cover 3 pivotally supported by a cabinet 2 of a record player by its own weight.

As shown in FIGS. 1 and 3, the rotary damper device 1 includes a housing 4, a cap 5 thereof, an inner and outer rotary shaft 6 protruding from the housing 4 to the outside of the cap 5, and a housing 4. A hollow inner rotor 7 that is housed inside, a fitting gap 8 between the housing 4 and the inner rotor 7, which is filled with a viscous oil 9 such as silicone oil, and an O-ring 10 that prevents the oil from leaking are provided. ..

In the hollow interior 7 of the inner rotor 7, as shown in FIG. 3, a metal first collar 11 that rotates integrally with the inner and outer rotary shafts 6 is provided coaxially with the first collar 11. A second metal collar 12 which is disposed and rotates integrally with the inner rotor 7, and a coil spring in which one end portion 13a is fitted to the outer circumference of the first collar 11 and the other end portion 13b is fitted to the outer circumference of the second collar. The ring 13 is stored as a one-way clutch mechanism. Reference numeral 14 denotes a gear that is fitted into the tip of the inner / outer rotary shaft 6. The housing 4, the cap 5, the inner and outer rotating shafts 6, the inner rotor 7, and the gear 14 may be made of metal, but are made of plastic here.

As shown in FIGS. 1 and 3, the housing 4 is composed of a circular bottom wall 4a and a peripheral wall 4b that rises in a cylindrical shape from the periphery of the bottom wall 4a, and has appropriate elasticity and rigidity. It is integrally molded with nylon resin, for example. The bottom wall 4a is formed with a shaft portion 15 which is a center of rotation of the inner rotor 7 and which bulges out from a substantially central portion into a circular blind cylindrical shape. In addition, three mounting pieces 16 radially extending in three directions are formed on the outer circumference of the peripheral wall 4b, and above that, there are slopes 17 'which are respectively located within the intervals of the mounting pieces 16. Form three upwardly-sawtooth-shaped cross-sectional claws 17 ...

The cap 5 includes a circular upper wall 5a and a peripheral edge portion 5b that hangs in a short annular shape from the periphery of the upper wall 5a and fits on the outer periphery of the upper end portion of the peripheral wall 4b of the housing. Similar to the housing 4 described above, it is integrally molded of, for example, a nylon resin having appropriate elasticity and rigidity. Then, in the upper wall 5a, a circular through hole 18 through which the inner and outer rotary shafts 6 pass is formed at the substantially center thereof. Further, the peripheral edge portion 5b is integrally formed with three downwardly extending tongue pieces 19 ... And the rectangular locking hole 19 into which the claw 17 of the Hausink is fitted and hooked to the tongue piece 19. Establish '

The inner and outer rotary shafts 6 have an annular flange 6a that is slightly smaller than the inner diameter of the inner rotor 7 and an annular protrusion that is rotatably fitted in the through hole 18 of the cap 5 and that is raised from the upper surface of the flange 6a. A cylindrical fitting portion 6d having a portion 6b, a projecting shaft 6c protruding further upward from the annular raised portion 6b, and a first collar 11 fitted from below and hanging from the lower surface of the collar portion 6a and having an open lower surface. And has a relatively high rigidity, for example, is integrally molded using POM or the like . Then, the projecting shaft 6c is non-circular, is a thisゝwith forming a small determine shaped cross-section, the flat side surfaces facing away, a pair of lateral grooves extending in the transverse middle of a U-shaped section of its height Form 20, 20.

On the other hand, the shaft hole 14 ′ of the gear 14 is also non-circular, and in this case, the shaft hole 14 ′ is formed in the same oval cross section as the cross section of the protruding shaft 6 c, and at the inner edge of the shaft hole 14 ′, the protruding shaft 6 c is formed. A pair of projecting ridges 21, 21 protruding inward facing each other, which are fitted in the lateral groove 20, are provided to project.

As shown in FIG. 4, the fitting portion 6d of the inner / outer rotary shaft 6 is provided with four key grooves 22 ... Indented radially inward on the outer peripheral surface thereof at equal intervals in the circumferential direction. Form.

On the other hand, as shown in FIG. 3, the first collar 11 has a generally donut shape, and is fitted in the outer periphery of the fitting portion 6d of the inner and outer rotary shaft 6 at the center thereof. Has a circular opening 23 penetrating therethrough, and four keys 24, which protrude inward in the radial direction and are fitted into the key grooves 22, are provided on the inner periphery of the opening 23. The second collar 12 has the same structure as the first collar 11, and is a common part in the embodiment.

The coil spring 13 has an inner diameter substantially equal to the outer circumferences of the collars 11 and 12, and is wound left-handedly here. By reversing the winding direction, the rotation direction during braking and the rotation direction during non-braking can be reversed.

As shown in FIGS. 3, 5 and 6, the inner rotor 7 has a lower wall 7a that is slightly smaller than the bottom wall 4a of the housing 4, and a cylindrical shape that rises from the periphery of the lower wall 7a. Like the housing 4 and the cap 5, it is made of, for example, a nylon resin and is integrally molded.

The opening 23 of the second collar 12 is fitted into the lower wall 7a of the hollow interior 7 of the inner rotor 7 from about the center thereof, and the shaft portion 15 of the bottom wall 4a of the housing 4 is fitted. Is a circular blind cylindrical protruding portion that protrudes from below, and a concentric protruding portion from the upper surface of the above-mentioned inserting portion 25 to a concentric shape, and is shallow in the cylindrical inserting portion 6d of the inner and outer rotary shafts 6. It has a cylindrical fitting portion 26 with a small diameter that projects. Similar to the fitting portion 6d of the inner / outer rotation shaft 6, four key grooves 27, which are recessed inward in the radial direction, into which the four keys 24 of the second collar 12 are respectively fitted, are formed on the outer periphery of the fitting portion 25. Form.

Further, on the outer surface of the inner rotor 7, a circular open surface 25 ′ of the fitting portion 25 opening to the lower surface of the lower wall 7 a is centered and radially extends in four directions at equal intervals in the circumferential direction, and Four grooves 28 with a U-shaped cross section, which rise from the peripheral edge along the tube wall 7b in an L shape and extend to the middle of the height of the tube wall 7b, are formed, and the lower surface of the lower wall 7a has four small grooves. The projections 7a '... are projected by changing the phase by 90 degrees. The small protrusions 7a 'secure a gap between the bottom wall 4a of the housing 4 and the lower surface of the inner rotor 7 by a predetermined distance, and the viscous oil enters into the predetermined distance so that the lower surface of the inner rotor 7 is covered by the housing. Since it is a protrusion provided so that it can rotate without rubbing against the bottom wall 4a of No. 4 and the frictional force does not increase, as shown in FIG.

An annular step portion 29 into which the O-ring 10 is fitted from above is formed on the upper edge of the cylindrical wall 7b, and a radial direction from the outer peripheral surface of the cylindrical wall 7b is formed below the annular step portion 29. An annular convex portion 30 that is slightly raised outward is formed. The annular protrusion 30 closes the upper end of the groove 28.

Next, the procedure for assembling each component having the above-described configuration will be described. First, an appropriate amount of viscous oil 9 is poured and placed in the housing 4, and then the inner rotor 7 is fitted from the upper surface of the opening. At this time, as shown in FIG. 1, the shaft portion 15 of the bottom wall 4a of the housing 4 projects into the inside from the open surface 25 'of the fitting portion 25 which is the blind cylinder of the inner rotor 7, and the inner rotor during rotation is rotated. The swinging of the actuator 7 is prevented. Further, the inner rotor 7 floats slightly above the upper surface of the bottom wall 4a of the housing 4 due to the small projection 7a 'protruding from the lower surface of the lower wall 7a thereof.

Then, the injected viscous oil 9 fills the fitting gap 8 between the housing 4 and the inner rotor 7, and the space between the bottom wall 4a of the housing 4 secured by the small protrusions 7a ′ and the lower surface of the inner rotor 7 is secured. The viscous oil 9 also fills within the predetermined interval. In this way, after the inner rotor 7 is mounted, the O-ring 10 is press-fitted into the annular step portion 29, and the O-ring 10 seals the fitting gap 8 between the housing 4 and the inner rotor 7. Further, the annular convex portion 30 below the annular step portion 29 of the inner rotor 7 prevents the viscous oil 9 from rising.

The groove 28 of the inner rotor 7 is an air reservoir mixed when the viscous oil 9 is injected. By rotating the inner rotor 7 in the housing 4, the mixed air is accumulated in the groove 28. Therefore, the diffusion of the air is prevented, and the variation of the torque due to the diffused air can be prevented in advance.

Next, the opening 23 of the second collar 12 is fitted into the fitting portion 25 of the inner rotor 7 from above. At this time, the four keys 24 of the second collar 12 are fitted into the key grooves 27 of the fitting portion 25, respectively, to prevent co-rotation.

On the other hand, similarly, the first collar 11 is similarly fitted from below into the fitting portion 6d of the inner and outer rotary shaft 6, and one end of the coil spring 13 is fitted to the outer circumference of the first collar 11 and the other end is It is fitted on the outer circumference of the second collar 12, and the inner rotor 7 and the inner / outer rotary shaft 6 are connected to each other via a coil spring 13. At this time, the fitting portion 26 projecting upward from the fitting portion 25 of the inner rotor 7 is shallower enters the inside from the opening surface 6d of the cylindrical fitting portion 6d of the inner and outer rotary shaft 6 ', the inner outer relative to the inner rotor 7 The swinging of the rotating shaft 6 during rotation is prevented.

Next, the through hole 18 of the cap 5 is aligned with the tip of the protruding shaft 6c of the inner and outer rotating shaft 6, and is attached to the upper edge of the housing 4. At this time, when the three tongue pieces 19 of the cap 5 are pushed in from above together with the claws 17 of the housing 4, the tongue pieces 19 are pushed by the inclined surface 17 'of the claws 17 and bend outward, so that the claws 17 are tongue-shaped. When reaching the locking hole 19 'of the piece 19, the tongue piece 19 is restored and the claw 17 fits into the locking hole 19', and the cap 5 cannot be removed (Figs. 1 and 7). At this time, the annular ridge 6b of the inner / outer rotating shaft 6 is fitted into the through hole 18 of the cap 5, and the protruding shaft 6c projects upward from the upper wall 5a of the cap 5. The housing 4 and the cap 5 may be ultrasonically welded, for example.

Finally, when the shaft hole 14 ′ of the gear 14 is press-fitted from the tip of the protruding shaft 6 c of the inner and outer rotating shaft 6, the protrusion 21 of the gear 14 is fitted into the lateral groove 20 of the protruding shaft 6 c, The gear 14 will not come out upward (Fig. 1, Fig. 7, Fig. 8).

On the other hand, an example of use of the assembled rotary damper device 1 will be described with reference to FIG. 2. On the side surface of the cabinet 2 of the record player, a metal member bent in an arc shape around the pivot 3 of the dust cover 3 is formed. The arc-shaped rack 31 is fixed, and a metal idler gear 32 that meshes with the outer teeth 31 ′ of the arc-shaped rack 31 is pivotally supported on the side surface of the cover 3 that rotates, and the idler gear 32 rotates to a position where the gear 14 meshes. Fix the damper device 1.

In order to fix the rotary damper device 1, a screw (not shown) is passed through the hole 16 ′ of the mounting piece 16 of the housing 4 to fix the rotary damper device 1.

It is also possible to omit the idler gear 32 and engage the plastic gear 14 of the rotary damper device 1 with the metal arc-shaped rack 31, but especially when the weight of the cover 3 is heavy. Since the rack 31 has an arcuate shape, an excessive force is easily applied to the gear 14 that meshes with the rack 31, and the gear 14 is easily deformed or worn. Therefore, it is preferable to interpose the idler gear 32 made of metal.

Next, the operation will be described. When the open cover 3 is turned down and closed, the braking force by the rotary damper device 1 is applied. That is, when the cover 3 is closed, in FIG. 2, the idler gear 32 rotates clockwise while meshing with the outer teeth 31 'of the arcuate rack 31, and the gear 14 of the rotary damper device 1 meshing with the idler gear 32 counterclockwise. Rotate around. Therefore, since the coil spring 13 is wound counterclockwise, when the inner and outer rotary shafts 6 and the first collar 11 rotate integrally with the gear 14, the coil spring 13 wound around the first collar 11 is tightened. The rotational force is transmitted to the inner rotor 7 via the second collar 12. Therefore, the inner rotor 7 rotates in the housing 4, and the rotation is damped by the viscosity of the viscous oil 9 present in the fitting gap 8 with the housing 4. Therefore, if the open cover 3 is tilted down a little and the hand is released, the pivot 3 and the inner rotor 7 are then rotated by their own weight, and the cover 3 is slowly and quietly closed.

The speed at which the vehicle is braked and closed is based on the weight of the cover 3, the gear ratio between the gear 14, the idler gear 32, and the arc-shaped rack 31, the viscosity and amount of the viscous oil 9, the fit of the inner rotor 7 and the housing 4. Determined by the combined area. Therefore, by appropriately changing the gear ratio, the viscosity and amount of the viscous oil 9 to be used, and the diameter and height of the inner rotor 7 and the housing 4, depending on the weight of the cover 3, the closing speed of the cover 3 can be freely set. Can be set to.

On the other hand, when the cover 3 in the closed state is raised and opened, the braking force by the rotary damper device 1 does not act, and the cover 3 opens lightly and quickly. That is, when the cover 3 is opened, the inner and outer rotating shafts 6 and the first collar 11 rotate clockwise together with the gear 14, so that the coil spring 13 is unwound. Therefore, slippage occurs between the coil spring 13 and the outer periphery of the first collar 11 or between the coil spring 13 and the outer periphery of the second collar 12, and the transmission of rotational force is interrupted.

Therefore, the cover 3 in the closed state can be opened lightly and quickly only by lifting the cover 3 upward. The open cover 3 is fixed in an open state by a known lock mechanism, and the lock mechanism is released when the cover 3 is closed again.

FIG. 9 shows another example of use of the rotary damper device 1, in which the inner and outer rotary shafts 6 of the rotary damper device 1 are directly connected to the pivot 3 of the cover 3. Therefore, when the cover 3 is closed, the inner and outer rotary shafts 6 rotate counterclockwise and the braking force works. When the cover 3 opens, the inner and outer rotation shafts 6 rotate counterclockwise and the braking force does not work.

In the embodiment shown in the drawings, the closing motion of the cover 3 is braked by the rotary damper device 1, but the rotary damper device 1 can be used for various other purposes. For example, a glow box or an ashtray of an automobile may be rotated downward by its own weight to prevent it from opening, a door of furniture or an electronic device may be prevented from opening due to a biasing force in the opening direction, or a housing may be blocked. The slide mechanism that moves back and forth with respect to 4 may brake the protrusion by the urging force in the protrusion direction.

[0036]

As described above, according to the present invention, a small protrusion is formed on the lower wall of the inner rotor facing the bottom wall of the housing to separate the lower wall of the inner rotor from the bottom wall of the housing. Since the gap is secured, it is possible to prevent the inner rotor from rubbing against the bottom wall of the housing and inadvertently increasing the braking force due to frictional force, and to achieve a stable damping force and a smooth damper function. A directional rotary damper device can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary damper device.

FIG. 2 is a side view showing an example of use of the rotary damper device.

FIG. 3 is an exploded perspective view of a rotary damper device.

FIG. 4 is a side view of the inner and outer rotating shafts.

FIG. 5 is a side view showing a cross section of one half of the inner rotor.

FIG. 6 is a bottom view of the inner and outer rotating shafts.

FIG. 7 is a side view showing an assembled state of the rotary damper device.

FIG. 8 is a plan view of an assembled state of the rotary damper device.

FIG. 9 is a side view showing another example of use of the rotary damper device.

[Explanation of symbols]

1 Rotational Damper Device 4 Housing 6 Inner / Outer Rotating Shaft 7 Inner Rotor 7a 'Protrusion 8 Fitting Gap 9 Viscous Oil 11 First Collar 12 Part of One-Way Clutch Mechanism Second Part of One-Way Clutch Mechanism Collar 13 Coil spring forming part of one-way clutch mechanism

Claims (1)

[Claims for utility model registration] [Claim 1] A hollow inner rotor and a housing that are rotatably fitted inside and outside, and viscous oil intervenes in a fitting gap between them. A lower wall of the inner rotor, which has inner and outer rotating shafts protruding outside the housing and a one-way clutch mechanism that transmits rotation in only one direction between the inner and outer rotating shafts and the inner rotor, and which faces the bottom wall of the housing. A rotary damper device, characterized in that a protrusion is formed on the inner wall of the inner rotor to separate the lower wall of the inner rotor from the bottom wall of the housing.