JPH0512579U - Rotary damper - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a rotary damper that can reduce the number of parts when mounting the rotary damper and that also facilitates the work of mounting the rotary body to the holder. A case main body 10, a rotor 24 rotatably housed in the case main body, and a rotary shaft 26 fixed to a rotation center of the rotor and connected to a rotating body are provided. An engaging arm 14 is provided that is filled and attached to the case body 10 and that snaps into a hole formed in the holder of the rotating body to fix the case body 10 to the holder.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary damper, and more particularly to improvement of a mounting structure for the rotary damper.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, a rotary damper has been known as a device for slowly rotating a rotary body such as a rotary door attached to the front surface of a cassette deck. This rotary damper accommodates a rotor rotatably in a cylindrical case, a rotary shaft having a gear at its end is fixed to the center of the rotor, and the rotary motion of the rotor is controlled by various types of viscous oil. It is configured to be braked by the restraining means. Therefore, by mounting this type of damper, it is possible to brake the rotational movement of the rotating body and rotate the rotating body at a moderate speed.

Another gear that meshes with the gear of the rotary shaft is provided at the center of rotation of the rotary body, and the rotational movement of the rotary body is transmitted to the rotor of the rotary damper via both gears and the rotary shaft. .. Of the various dampers, in the oil damper, viscous oil is enclosed in the case, and even if rotational force is suddenly applied to the rotor, the viscous resistance of the oil existing between the rotor and the case causes Rapid rotation is suppressed and the rotating body rotates at a moderate speed. A leg for fixing the rotary damper to a holder of a rotating body such as a cabinet is formed in the case of the rotary damper, and the rotary damper is attached to the holder by fixing the leg to the holder with a bolt. It is composed.

[0004]

[Problems to be solved by the device]

 In the conventional rotary damper, there is a problem in that the legs need to be bolted in order to attach the rotary damper to the holding body, which increases the number of parts and makes mounting work difficult.

Therefore, an object of the present invention is to provide a rotary damper in which the number of parts when mounting the rotary damper can be further reduced and the mounting work of the rotary body to the holding body can be simplified.

[0006]

[Means for Solving the Problems]

 To achieve this object, the present invention comprises a case main body, a rotor rotatably housed in the case main body, and a rotating shaft fixed to the rotation center of the rotor and connected to the rotating body. In the rotary damper for braking the rotational movement of the rotor, the case main body is fixed to the holding body by snap-fitting the hole attached to the case main body and formed in the holding body of the rotary body. It is characterized by having an engaging arm for fixing.

The rotating shaft is configured to be fitted in a shaft hole of a rotation center of a rotating body, and the rotating shaft is a spline shaft, and a groove that engages with the spline groove is formed in the shaft hole. It is preferable that the case body has a boss that fits into a groove formed in the holder.

[0008]

[Action]

 According to this invention, the engaging arm can be snap-engaged with the holding body only by inserting the engaging arm of the rotary damper from the front surface on the rotation side of the rotating body into the hole formed in the holding body of the rotating body. .. As a result, when mounting the rotary damper, the rotary damper can be mounted on the holding body by a simple operation without requiring fixing parts such as bolts.

If the rotary shaft of the rotary damper is fitted in the shaft hole of the rotary body without passing through the gear, the gear for connecting the rotary body and the rotary damper can be omitted, and the number of parts is further reduced. The gears can be reduced, and the gears are not visible, which is advantageous in terms of design.

Further, by spline-engaging the rotary shaft of the rotary damper and the shaft hole of the rotary body, it is possible to perform a small angle alignment when the rotary shaft is fitted into the shaft hole. The work when fitting into the hole becomes easy.

Further, by providing the case body with a boss that fits into a groove formed in the holding body, when the rotary damper is attached to the holding body, the rotation damper is not only the snap engagement arm but also the boss. However, even if an excessive force is applied to the rotating body, it is possible to prevent damage to the rotating damper or prevent the rotating damper from coming out of the holding body.

[0012]

【Example】

 DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention and a drawing will be described. FIG. 1 shows an embodiment of an oil damper, (1) is a front view thereof, and (2) is a side view thereof.

This oil damper has a case main body 10, and a flange 12 thinner than the case main body is connected to the case main body 10. Further, from the flange 12, an engaging arm 14 which is shorter in width than the flange and which is snap-engaged with a hole formed in the holder is continuously provided. The case body 10, the flange 12, and the engaging arm 14 can be integrally formed of synthetic resin.

The engaging arm 14 has a tip 14 A formed to be thicker than the intermediate region 14 B, and has a notched gap 16 inside. A clip arm 18 extends from the tip 14A of the engagement arm 14 toward the case body 10 in the gap 16, and the tip of the clip arm 18 extends to the vicinity of the case body 10. A taper protrusion 20 is provided in the middle of the clip arm 18.

As shown in FIG. 2 which is a II-II cross section of FIG. 1A, the inside of the case body 10 is hollow and an inner chamber 22 is formed. A rotor 24 is housed in the inner chamber 22, and a rotary shaft 26 of the rotor is formed in the rotor 24 integrally with the rotor. A through hole 28 is formed in the center of the case body 10 for the rotation shaft 26 to penetrate therethrough, and the rotation shaft 26 projects out of the case body 10 at a right angle to the radial direction of the rotor 24 from the through hole 28. As shown in FIG. 1 (1), the end surface of the rotary shaft 26 is a non-circular, substantially rectangular shape, and prevents slippage between the shaft groove and the rotary shaft when it is fitted into the shaft groove of the rotating body described later. Thus, the rotary motion of the rotary body is surely input to the rotary shaft 26.

As shown in FIG. 2, from the lower wall of the inner chamber 22, a cylindrical support shaft 32 that fits into a circular groove 30 formed at the center of rotation of the lower surface of the rotor 24 is projected. .. The rotor 24 rotates around the support shaft 32. An O-ring 34 is provided around the lower end of the through hole 28 of the case main body 10 to prevent the viscous oil filled in the inner chamber 22 from leaking out from the through hole 28.

As shown in FIG. 3, which is a sectional view taken along the line III-III of FIG. 2, the rotor 24 has a rectangular shape, and both ends in the longitudinal direction are formed into an arc-shaped substantially rectangular shape complementary to the inner wall of the case. The torque resistance of the viscous oil interposed between the rotor 24 and the inner wall of the case body 10 brakes the rotational movement transmitted from the rotary shaft 26 to the rotor 24. By forming the rotor 24 into a substantially rectangular shape as in this embodiment, the rotational movement of the rotor is effectively damped. Reference numeral 36 is a boss for reinforcing the case body 20, which is bulged from the lower surface of the central portion of the case body 10.

Next, the operation of this embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a perspective view showing a state in which the oil damper is attached to a revolving door as a rotating body and a cabinet as a holding body for holding the rotating body, and FIG. 5 is a sectional view showing a state in which an oil damper is attached. It is a figure.

On the revolving door 50, a bracket 52 is provided so as to project inside the door in the direction of rotation (indicated by the arrow) and slightly inward from the side end. At the center of the bracket 52, an oil damper is provided. A shaft hole 54 into which the rotary shaft 26 is fitted is formed. Reference numeral 56 denotes a cabinet, which includes a side wall 56A, a back wall 56B, and a second back wall 56C located further back than the back wall. The rear wall 56B is formed with an engagement hole 58 into which the snap arm 14 of the oil damper is inserted for snap engagement, and the side wall 56A is provided with a boss groove 60 into which the boss 36 of the oil damper is fitted. Has been formed. The engagement hole 58 is formed to have substantially the same size as the snap arm 14.

When installing the oil damper, after the rotary shaft 26 of the oil damper is fitted in the shaft hole 54 of the bracket 52, the oil damper is inserted between the side wall 56A of the cabinet and the bracket 52 of the door. Is arranged so that the front end of the is facing the engaging hole 58. When the oil damper is pushed in from this state, the snap arm 14 is snap-engaged with the engagement hole 58 when the end surface 12A (see FIG. 1) of the flange 12 of the case body 10 comes into contact with the back wall 56B. It During the process of fitting the snap arm 14, the taper protrusion 20 formed on the clip arm 18 contacts the opening wall surface of the engagement hole 58. At this time, the clip arm 18 is at the base end at the snap arm tip 14A. The part is elastically deformed toward the boss 36 side. Then, the elastically deformed clip arm 18 elastically returns when the flange end surface 12A comes into contact with the back wall 56B, the taper projection 20 engages with the back surface 62 of the back wall, and the oil damper is pushed back. Exiting from wall 56B is prevented.

When the oil damper is snapped into the engagement hole 58, the boss 36 formed on the back surface of the case body is fitted into the boss groove 60 of the side wall 56A of the cabinet. Until the boss 36 is fitted into the boss groove 60, the snap arm 14 needs to be deformed in order to absorb the thickness of the boss 36. Since the central region 14B of the snap arm 14 is formed thinner than the tip 14A of the snap arm 14 as shown in FIG. 1 (2), it is easily elastically deformed in this portion and the thickness of the boss 36 is easily absorbed. Then, the oil damper can be attached to the holder.

According to this embodiment, the oil damper can be easily snap-engaged with the holder with a feeling of moderation simply by pushing the oil damper into the engagement hole 58 from the opening side of the rotary door 50. When installing the oil damper, it is possible to reduce the number of parts by not requiring mounting parts such as bolts. Further, even if a force in the counterclockwise direction of rotation is applied to the revolving door 50 at the maximum rotation position, the oil damper is supported not only by the snap arm 14 but also by the boss 36. The rigidity of the damper is improved, and at the same time, it is possible to effectively prevent the oil damper from slipping out. That is, if the boss 36 is not provided, stress is exerted on the base portion of the snap arm 14 via the rotation shaft 26 under the condition where the force in the rotation direction is applied, and the durability of the base portion is deteriorated. , The snap arm may come out. However, the presence of the boss 36 can alleviate the stress applied to the base of the snap arm 14 and prevent the occurrence of these inconveniences. Further, since the rotary shaft 26 is of a direct shaft type in which the rotary shaft 26 is directly fitted into the shaft hole 54, a gear for connecting the both is not required. As a result, even if the door 50 is rotated, the gear is not exposed and the design is excellent.

FIG. 6 shows another embodiment in which the rotary shaft is a spline shaft. In this embodiment, the shaft hole on the rotating door side is formed with a groove that engages with the spline groove. With such a configuration, the angle of fitting the rotary shaft into the shaft hole can be adjusted with a maximum pitch of one spline groove, and the work of fitting the rotary shaft and the shaft hole becomes extremely easy. If the rotation axis is substantially rectangular as shown in FIG. 1, it is necessary to adjust the angle up to 180 degrees. As shown in FIG. 7, which is another embodiment, the base portion of the rotary shaft 26 is formed into a taper 70 that expands in diameter as it goes to the case body 10 side, and the tip end of the shaft hole is formed into a complementary tapered hole. By forming it, the workability when the rotary shaft is fitted into the shaft hole can be further improved.

FIG. 8 and FIG. 9 show other embodiments of the engaging arm 14, respectively. In the oil damper shown in FIG. 8, a tapered projection 80 is formed integrally with the engaging arm 14 on the side surface of the engaging arm 14 so as to expand toward the case body 10 side. In this embodiment, when the engaging arm 14 is fitted into the engaging hole 58 formed in the back wall 56B of the cabinet 50, the notch 82 formed in the engaging arm 14 causes the tapered protrusion 80 to move inward. It is elastically deformed in one direction and elastically returns when the tapered projection 80 crosses the engaging hole 58. As a result, the engagement arm 14 is engaged with the back surface of the back wall 56B with a feeling of moderation, and the oil damper can be securely fixed.

On the other hand, in the oil damper of FIG. 9, the taper protrusion 90 is formed to be elongated and a right-angled engagement groove 92 is formed at the tip thereof as compared with the embodiment of FIG. ing . Further, a notch 94 for accommodating the tapered protrusion 90 is formed on the side surface of the engaging arm 14. In this embodiment, when the engagement arm 14 is fitted into the engagement hole 58, the taper arm 90 is elastically deformed in the notch 94 around the fixing portion 96 with the engagement arm 14 as a center, and the taper arm 90 is formed. Elastically recovers when it passes through the engagement hole 58, and the engagement groove 92 at the tip of the tapered projection 90 and the opening wall surface of the back wall 56B are engaged with each other. As a result, the oil damper can be securely fixed as in the embodiment of FIG. Thus, the shape of the engaging arm may be any shape as long as the case body 10 can be snap-engaged with the holding body.

Although the snap arm is formed horizontally with respect to the case body in the above-described embodiment, the snap arm may be formed vertically with respect to the case body. Further, the rotating body may be rotated by attaching a gear to the end of the rotating shaft and also attaching a gear to the rotating body side so that both gears mesh with each other. Furthermore, in the above-described embodiment, the boss is formed on the back surface of the case body. However, even if the boss is not formed, a circular groove into which the entire case body fits is formed on the side wall of the holder, so that the oil damper is The rigidity of can be improved.

Further, in the above embodiment, the oil damper that brakes the rotational movement of the rotating body by viscous resistance of the viscous oil has been described, but it is not limited to this oil damper, and the rotational movement of the rotor may be braked. It suffices if it is a rotary damper that can brake the rotational movement of the rotating body. Therefore, the present invention can be applied to various rotary dampers such as a damper braked by a brake, a damper controlled by a reduction gear, and a damper braked by a magnet.

[0028]

As described above, according to the present invention, the case body is fixed to the holder body by snap-engaging the hole formed in the holder body of the rotating body while being attached to the case body. Since the configuration has the fixed engagement arm, it is possible to further reduce the number of parts when mounting the rotary damper, and it is possible to achieve the effect that the work of mounting the rotary body to the holding body can be simplified.

By configuring the rotary shaft of the rotary damper to be fitted in the shaft hole of the rotary body without interposing the gear, it is possible to omit the gear for connecting the rotary body and the rotary damper. The number of points can be reduced, and the effect that the gear cannot be seen and is advantageous in terms of design can also be achieved.

Further, by adopting a configuration in which the rotary shaft of the rotary damper and the shaft hole of the rotary body are spline-engaged, it is possible to perform positioning at a small angle when the rotary shaft is fitted into the shaft hole, and the rotation It is also possible to achieve the effect of improving workability when fitting the shaft into the shaft hole.

Further, by providing the case main body with the boss that fits into the groove formed in the holding body, when the rotary damper is attached to the holding body, the rotary damper is not limited to the snap engaging arm. This boss can also be supported, and even if an excessive force is applied to the rotating body, it is possible to prevent damage to the rotating damper or prevent the rotating damper from coming out of the holding body.

[Brief description of drawings]

FIG. 1 shows an embodiment of an oil damper according to the present invention, (1) is a front view thereof, and (2) is a side view thereof.

FIG. 2 is a II-II cross section of FIG.

3 is a III-III cross section of FIG.

FIG. 4 is a perspective view showing a state where an oil damper is attached to a rotating body and a holding body.

FIG. 5 is a sectional view showing a state in which an oil damper is attached.

FIG. 6 is a side view of an oil damper according to another embodiment in which a rotary shaft is a spline shaft.

FIG. 7 is a partial cross-sectional view showing a state in which an oil damper according to another embodiment in which a base portion of a rotary shaft is tapered is fitted in a shaft hole of a bracket.

FIG. 8 is a front view of an oil damper showing another embodiment of the engaging arm.

FIG. 9 is a front view of an oil damper showing still another embodiment of the engagement arm.

[Explanation of symbols]

 10 Case body 14 Engaging arm 26 Rotating shaft

Claims (4)

[Scope of utility model registration request] 1. A rotating body, comprising: a case body; a rotor rotatably housed in the case body; and a rotating shaft fixed to a rotation center of the rotor and connected to a rotating body. In the rotating damper to be braked, it is provided with an engaging arm which is attached to the case body and snap-engages with a hole formed in the holder of the rotating body to fix the case body to the holder. Characteristic rotary damper. 2. The rotary damper according to claim 1, wherein the rotary shaft is fitted in a shaft hole of a center of rotation of the rotary body. 3. The rotary damper according to claim 2, wherein the rotary shaft is a spline shaft, and a groove that engages with a spline groove is formed in the shaft hole. 4. The case body is formed with a boss that fits into a groove formed in the holding body.
The rotary damper according to any one of 1.