JP3233581B2 - Grease damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper attached to an opening / closing member of a used device such as a video device, an audio device, an OA device, furniture, a cosmetic case, and more specifically, a desired damping by sealing grease. Grease damper.

[0002]

2. Description of the Related Art Opening and closing members of the above-mentioned equipment include:
A rotating damper is attached to make it open slowly and give a sense of quality. FIG. 5 is an exploded perspective view showing a conventional technique of this type of rotary damper. In FIG. 5, a rotary damper 90 includes a bearing 50, a rotating shaft 60 inserted into the bearing 50, a silicone oil 70 as a viscous fluid injected into a gap between the bearing 50 and the rotating shaft 60, 80 such as an O-ring for preventing leakage of water
It is composed of

The bearing 50 is formed in a cylindrical shape and has a small through hole 5.
The inner peripheral surfaces of the second and large via holes 54 are formed inside. The bearing 50 also has a ring-shaped groove 56 formed near the opening of the large atrium 54.

The rotary shaft 60 has a small diameter shaft portion 62 inserted into the small via hole 52 of the bearing 50 and a large diameter shaft portion 64 inserted into the large via hole 54. The rotation axis 60 also
A groove 66 is formed in the longitudinal direction of the small diameter shaft portion 62, and a ring-shaped groove 68 is formed in the circumferential direction of the large diameter shaft portion 64.

In the rotary damper 90 thus configured, when the rotary shaft 60 is inserted into the bearing 50, the rotary oil is inserted into the groove 66 formed in the small-diameter shaft portion 62 of the rotary shaft 60 while silicon oil 70 is injected. . At this time, since the sealing body 80 such as an O-ring is attached to the groove 68 formed in the large-diameter shaft portion 64, when the rotating shaft 60 is completely housed in the bearing 50, the sealing body 80 50 also enters into the groove 56 formed in the large atrium 54, and the inside is sealed.

[0006]

However, in such a conventional technique, a sealing member 80 such as an O-ring must be used in order to prevent the silicone oil 70, which is a viscous fluid, from flowing out. There was a problem that the number increased. In addition, because of the structure in which the bearing is sealed with an O-ring or the like, the gap between the bearing 50 and the rotating shaft 60 is filled with silicone oil 7.
It was difficult to spread 0.

The present invention solves the above-mentioned problems of the prior art and reduces the number of parts by preventing outflow of a viscous fluid without using a sealing member such as an O-ring. It is an object of the present invention to provide a grease damper excellent in functionality and productivity capable of uniformly distributing the gap between the bearing and the rotating shaft.

[0008] In order to solve the above-mentioned problems , a grease damper according to the present invention is provided with a cylindrical bearing mounted on a first member side of a device to be used, and is rotatably inserted into the cylindrical bearing. It has a substantially cylindrical rotating shaft attached to the second member side, and grease filling a gap formed between the cylindrical bearing and the rotating shaft. This grease has a predetermined viscosity that does not flow out of the cylindrical bearing. Further, the rotating shaft is provided with the cylindrical bearing.
A grease passage is formed in a substantially longitudinal direction when inserted into
Before being formed on the rotating shaft
The grease passage has a substantially longitudinal straight passage and this straight passage.
A combination of passages generally perpendicular to the passage, or
A spiral passage formed spirally along a substantially longitudinal direction.
A grease damper configured to be misaligned.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a grease damper according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, there is shown an exploded perspective view showing an embodiment of a grease damper according to the present invention.
The grease damper 10 according to the present embodiment is used as a braking component that slowly opens and closes a door or the like of a used device.
That is, the present invention is applied to an opening / closing lid provided at a cassette insertion slot of a video deck, an operation panel of a television, a disk insertion slot of a floppy disk device, a CD (compact disk) device, or an MO (magneto-optical recording) device.

As shown in FIG. 1, the grease damper 10 comprises a cylindrical tubular bearing 20 and a cylindrical rotating shaft 30. The cylindrical bearing 20 is a bearing formed of a synthetic resin or the like, and has a through hole 22 (with an inner diameter of about 3.5 mm) having a length into which the rotating shaft 30 is inserted. It is formed with a length of about 20 mm.
The cylindrical bearing 20 is also formed with a rectangular fixing pedestal 24 for stable attachment to a device to be used. The cylindrical bearing 20 is further formed with a through hole 26 (see FIG. 2) that can be attached to a projection or the like of a device to be used on the side opposite to the side where the rotary shaft 30 is inserted. The diameter of the hole 26 is smaller than that of the hole 22,
Between the perforations 22 and 26, as shown in FIG.
Are formed.

The rotating shaft 30 is a rotating shaft formed of a synthetic resin, for example, having a shaft diameter of about 3.3 mm, and has a pair of I-cuts 32a and 32b having substantially the same length in the longitudinal direction. Is formed. These I cuts 32
Are formed in directions different from each other by 90 ° with the ring-shaped groove 34 interposed therebetween. These I-cuts 32a, 32b and groove 3
4, when the rotating shaft 30 is inserted into the cylindrical bearing 20,
The grease 15 forms a grease passage for evenly spreading the entire inner peripheral surface of the rotating shaft 30. In the present embodiment, since such a grease passage is formed, the cylindrical bearing 20
The clearance between the shaft and the rotating shaft 30 can be secured. For this reason, a high load is not applied when the rotating shaft 30 is inserted, and the inserting operation can be easily performed.

Further, a ring-shaped grease reservoir 36 is formed on the opening side of the rotating shaft 30. The grease reservoir 36 is a portion where the remaining grease is finally accumulated after the grease has spread to the entire inside by the I-cuts 32a and 32b and the groove 34. The grease pool 36 makes it possible to absorb variations in the amount of grease, and to cover a certain amount of grease evenly overflowing when the rotating shaft 30 is inserted. Therefore, even when the grease 15 is non-uniformly injected into the bottom surface of the cylindrical bearing 20, the grease 15 does not overflow to the outside, the grease 15 can be evenly filled inside, the torque variation can be reduced, and the wiping work can be performed. There is almost no need.

Such an effect of the grease reservoir 36 can be similarly expected regardless of whether the grease passage is formed or not. In the rotating shaft 30, up to the grease reservoir 36 is inserted into the cylindrical bearing 20. In the embodiment shown in FIG. 1, the grease reservoir is formed on the rotating shaft 30 side. However, the present invention is not particularly limited to this, and the diameter of the cylindrical bearing 20 on the opening side is increased. This portion may be used as a grease pool. In this case, the same effects as those described above can be obtained.

The rotary shaft 30 is further formed with an I-cut engagement shaft 38 that is exposed to the outside. The engagement shaft portion 38 is a shaft portion fitted and fixed in a hole of the same shape formed in a door or the like of a device to be used. In the present embodiment, the engaging shaft portion 38 has an I-cut shape, but may have a rectangular shape, a semicircular shape, or the like as long as it can be fitted and fixed.

The grease 15 is grease having a predetermined viscosity. For example, the grease 15 is set up vertically and is dropped on the bottom of the cylindrical bearing 20 in the direction of arrow a from above. The grease used in the present embodiment is grease having such a viscosity that grease accumulated in the grease accumulation 36 does not flow out later after the rotary shaft 30 is inserted into the cylindrical bearing 20 and spread over the entirety. is there.

That is, in the case where grease from Shin-Etsu Chemical Co., Ltd. is taken as an example, this viscosity can be expressed as a torque value as shown in the product characteristics. In this case, the above dimensional value (size of the perforation 22: about 3.5 mm)
About, the length into which the rotating shaft 30 is inserted: about 20 mm,
(The diameter of the rotating shaft 30: about 3.3 mm)
(gf-cm) or more can be used, and experimental results show that good viscosity can be obtained if it is 21 (gf-cm) or more. As a specific product, for example, if the product name is G330 made by Shin-Etsu Chemical Co., Ltd., it can be used without any problem. The above numerical values are based on the numerical values of the product characteristics described in the grease product catalog issued by Shin-Etsu Chemical Co., Ltd. Therefore, it is only necessary that the degree of grease flow is equal to that of the above-described torque value, and in the case of other company's products, it is not necessarily limited to the above-mentioned numerical value.

FIG. 2 is an explanatory diagram showing a flow of the grease 15 when the rotating shaft 30 is inserted into the bearing 20 after the grease 15 is dropped on the bottom of the cylindrical bearing 20. Grease 1
5 is dropped on the bottom of the cylindrical bearing 20, and then the rotating shaft 30 is gradually inserted into the cylindrical bearing 20, and the grease 15 is crushed by the tip of the bearing 20, and the grease 15 is moved in the direction shown by the arrow b. Moves. Specifically, the crushed grease 15 flows into the groove 34 through the grease passage formed by the I-cut 32a, and further flows into the grease reservoir 36 through the I-cut 32b.

At this time, the grease 15 actually spreads from the grease passage to the entire peripheral surface of the rotary shaft 30 as shown by the arrow in FIG. 3, and the remaining grease 15 accumulates in the grease accumulator 36. Thereby, the grease 15 is filled in a gap formed between the cylindrical bearing 20 and the rotating shaft 30 in a liquid-tight manner,
The inside is closed (vacuum). For this reason, the rotating shaft 30
Is pulled out from the cylindrical bearing 20, a negative pressure is generated and it is pushed back to the original state.

FIG. 4 is a perspective view showing another embodiment of the rotating shaft. The rotating shaft 40 is provided with I-cuts 32a and 32b.
And spiral grooves 42a, 42b instead of grooves 34
Is formed on the shaft main body so that the grease 15 spreads over the entire shaft. That is, the spiral groove 42a, 42b facing the rotary shaft 40 is formed along the longitudinal direction of the shaft, and the grease 15 spreads over the entire shaft as shown by the arrow by these spiral grooves, and the remaining grease 15 is accumulated in the grease reservoir 36. Accumulate in

In the present embodiment, as a preferred embodiment of the present invention, I-cuts 32a, 32b
Although the example in which the grease passage is formed by the groove 34 and the spiral grooves 42a and 42b is shown, the grease passage is not necessarily limited to these in the present invention. That is, the present invention only needs to have a shape in which a grease passage through which the grease 15 spreads uniformly is formed on the entire peripheral surface of the rotating shaft. For example, the present invention is a diamond-shaped groove formed by intersecting a mesh-shaped groove or a spiral groove. Is also good.

In this embodiment, the size of the hole 22, the length into which the rotary shaft 30 is inserted, or the specific dimensions of the shaft diameter of the rotary shaft 30 are shown, respectively. It is not limited to these dimensions.

[0023]

As described above, according to the grease damper of the present invention, since the grease having a predetermined viscosity is used, no sealing means such as an O-ring for preventing the outflow of the viscous fluid is required. The number of parts can be reduced. In addition, by forming the grease pool, it is possible to absorb variations in the amount of grease, and to cover a certain amount of grease evenly overflowing during insertion. Therefore, by using the present invention, it is possible to provide a grease damper excellent in functionality and productivity.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a grease damper according to the present invention.

FIG. 2 is an explanatory diagram showing a flow of grease when a rotating shaft is inserted into a cylindrical bearing in the grease damper shown in FIG.

FIG. 3 is an explanatory diagram showing a flow of grease on a rotation axis of the grease damper shown in FIG.

FIG. 4 is an explanatory diagram showing a flow of grease on a rotating shaft of another embodiment of the grease damper according to the present invention.

FIG. 5 is an exploded perspective view of a rotary damper according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Grease damper 20 Cylindrical bearing 22 Through hole 24 Fixing pedestal 30, 40 Rotating shaft 32a, 32b I cut 34 Groove 36 Grease accumulation 38 Engagement shaft part 42a, 42b Spiral groove

Claims (2)

(57) [Claims] 1. A cylindrical bearing mounted on a first member side of a device to be used, and a substantially cylindrical shape rotatably inserted into the cylindrical bearing and mounted on a second member side of the device to be used. A rotating shaft, having grease filled in a gap formed between the cylindrical bearing and the rotating shaft, wherein the grease has a predetermined viscosity that does not flow out of the cylindrical bearing; The rotating shaft was inserted into the cylindrical bearing on the rotating shaft.
In order to form a grease passage substantially in the longitudinal direction
The grease passage shaped and formed on the rotation shaft has a substantially longitudinal direction.
And a path substantially perpendicular to the straight path
Or a spiral along the longitudinal direction
A grease damper , which is one of the formed spiral passages . 2. The grease damper according to claim 1 , wherein a grease reservoir, in which the grease accumulates when the grease is filled in a liquid-tight state, is formed on an opening side of the cylindrical bearing on the rotating shaft. and it is, grease damper, characterized in that.