KR100671654B1 - Rotary damper - Google Patents

Abstract

(Problem) Provides a rotary damper capable of maintaining a constant torque accuracy because unnecessary air is not collected in the receiving portion, assembly is easy, and air is not mixed in the viscous fluid.

(Solution means) In the rotary damper D for braking by the viscous fluid 51 that the driven rotation member 11 and the fixed support member 21 rotate relatively, the driven rotation member 11 is fixed with the driven rotation member 11. The outer peripheral end of the annular accommodating portion 41 accommodating the viscous fluid 51 formed between the supporting members 21 is relative to the driven rotating member 11 and the fixed supporting member 21. An inner cylindrical wall 16 having an opening through which the central portion of the accommodation portion 41 is connected to the atmosphere in the driven rotating member 11, After assembling the driven rotating member 11 and the fixed supporting member 21, the opening of the inner cylindrical wall 16 is closed.

Description

Rotary Damper {ROTARY DAMPER}

1 is an exploded front sectional view of a rotary damper according to an embodiment of the present invention;

2 is a plan view of the fixed support member shown in FIG.

3 is a plan view of the driven rotating member shown in FIG.

FIG. 4 is a cross sectional front view of the assembled parts shown in FIG. 1 as a rotary damper during assembly;

FIG. 5 is a plan view of the assembly diagram of the components shown in FIG. 1 assembled to form a rotary damper; FIG.

FIG. 6 is a cross sectional front view in which the respective components shown in FIG. 1 are assembled to form a rotary damper and a rotary damper is attached to the skin member; FIG.

7 is an explanatory diagram showing another example of blocking the inner cylindrical wall.

8 is an explanatory diagram showing still another example of blocking an inner cylindrical wall;

9 is an explanatory diagram showing still another example of blocking an inner cylindrical wall;

10 is an explanatory diagram showing an example of forming an opening in a fixed support member;

Explanation of symbols on the main parts of the drawings

D-Rotary Damper 11-Driven Rotary Member

12-Gear part (driven rotating part) 13-Retaining flange part

14-outer cylindrical wall 15-retaining flange

16-Inner cylindrical wall (opening, tubular) 16A-Cap

16B-Cap 16C-Cap

16Ⅹ-inner cylindrical wall with bottom 16s-step

16c-occlusion 16p-protrusion

16f-Flange 17-Groove

18-Ditch (Complementary Ditch)

19-Welding regulation part (spacing regulation part) 21-Fixed support member

22-bottom wall 23-outer cylindrical wall

23d-stepped part 23u-stepped part

24-inner cylindrical wall 25-central axis

25 tons-through hole 26-circumferential groove (complementary engagement)

27-Attachment 28-Retaining Piece

28a-Retaining protrusions 29-Retaining protrusions

31-O-rings {sealing means} 41-receptacles

51-Viscous fluid H-Heating chip (welding jig)

c-recess p-protrusion

E-Skin Plate h-Hole

The present invention relates to a rotary damper for braking by a viscous fluid viscous fluid that the driven rotating member and the fixed support member for supporting the driven rotating member freely rotate.

As the above-mentioned rotary damper, for example, a driven rotating member integrally provided with a driven rotating part engaged with a driving member such as a gear or a rack, and a fixed support for holding the driven rotating member freely in rotation. A member, an annular accommodating portion formed between the fixed supporting member and the driven rotating member, sealing means for sealing the outer peripheral end of the accommodating portion so that the driven rotating member and the fixed supporting member are relatively rotatable; It is well-known that it is comprised by the viscous fluid accommodated in a part and braking the rotation of a driven rotation member and a fixed support member relatively.

[Patent Document 1] Japanese Utility Model Registration Publication No. 2603574

The conventional rotary damper has an opening (hole) in the center of the fixed support member for connecting the receiving portion to the atmosphere so that unnecessary (more than necessary) air is contained in the receiving portion when assembling the driven rotating member and the fixed supporting member. It is easy to assemble so that it does not collect, and also the torque precision is made constant so that air does not mix in a viscous fluid.

However, the countermeasure that the viscous fluid leaks out from the opening (hole), that is, the opening (hole) is not blocked, so that viscous fluid may leak out of the opening (hole) when the rotary damper is used under high temperature.

Therefore, in consideration of the leakage of the viscous fluid from the opening (hole), a rotary damper has been proposed that does not form an opening (hole) through which the receiving portion passes through the atmosphere.

[Patent Document 2] Japanese Utility Model Publication No. Hei 1-37236

[Patent Document 3] Japanese Patent Publication No. 341484

[Patent Document 4] Japanese Utility Model Registration Publication No. 2519149

[Patent Document 5] Japanese Patent Application Laid-Open No. 11-30261

However, if an opening (hole) through which the housing part is connected to the atmosphere is not formed, air gathers in the housing part, resulting in poor assembly and at the same time, air is mixed into the viscous fluid, causing unevenness in torque, and constant torque accuracy. (Torque unevenness occurs).

The present invention is as follows.

(1) a driven rotating member integrally provided with a driven rotating portion engaged with the driving member, a fixed supporting member for holding the driven rotating member freely in rotation, the fixed supporting member and the driven rotating member; A rotary damper comprising an annular accommodating portion formed between members and a viscous fluid accommodated in the accommodating portion and braking that the driven rotating member and the fixed support member rotate relatively. A sealing means for sealing an end portion of the driven rotating member and the fixed supporting member so as to be relatively rotatable, and on at least one side of the driven rotating member and the fixed supporting member to the atmosphere inward of the sealing means of the receiving portion. An opening through which the opening is made, and the opening is closed after assembling the driven rotating member and the fixed supporting member. The.

(2) In the rotary damper described in (1), when the driven rotating member and the fixed supporting member are assembled, the gap between the driven rotating member and the fixed supporting member in the rotation axis direction in which the fixed rotating member is relatively rotated is regulated. Characterized in that the spacing is formed on at least one side of the driven rotating member and the fixed support member.

(3) The rotary damper according to (2), wherein the blocking means for closing the opening is welding.

(4) The rotary damper according to (3), wherein a central axis is formed at the center of the fixed support member, and a cylindrical portion having the opening through which the central axis is inserted is formed in the driven rotation member, and the cylindrical shape is provided. In the part, the welding regulation part which controls that the said molten cylindrical part part contact | connects the said central axis is formed, It is characterized by the above-mentioned.

(5) The rotary damper according to (4), wherein the driven rotation member and the fixed support member are moved in a direction of rotation axis relatively rotated between an inner circumference of the cylindrical portion and an outer circumference of the central axis. In addition, the driven rotating member and the fixed support member is characterized in that the complementary engaging portion is formed to be relatively rotatable.

(6) The rotary damper according to (4) or (5), wherein the welding control part also serves as the gap control part.

(The best form to carry out invention)

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described based on drawing.

1 is an exploded front sectional view of a rotary damper according to an embodiment of the present invention, FIG. 2 is a plan view of the fixed support member shown in FIG. 1, FIG. 3 is a plan view of the driven rotating member shown in FIG. 1, and FIG. 4 is shown in FIG. 5 is a sectional front view of the assembly diagram in which each component is assembled into a rotary damper, FIG. 5 is a plan view of the assembly diagram in which each component is assembled into a rotary damper, and FIG. It is sectional drawing in the state which attached the rotary damper to the skin attachment member.

In Fig. 1, D denotes a rotary damper, a driven rotating member 11 made of synthetic resin, a fixed supporting member 21 made of synthetic resin for holding the driven rotating member 11 freely, It is attached to the driven rotating member 11, the outer peripheral end of the annular receiving portion 41 (see Fig. 4 or 6) formed between the driven rotating member 11 and the fixed support member 21 As the sealing means for relatively rotatably sealing the co-rotating member 11 and the fixed support member 21, for example, an O-ring 31 suitably formed of silicone rubber or EPDM (ethylene propylene diene rubber), It is accommodated in the accommodating part 41 (refer FIG. 4 or FIG. 6) formed by the driven rotation member 11 and the fixed support member 21, and the driven rotation member 11 and the fixed support member 21 are It consists of a viscous fluid 51 (see Figs. 4 or 6), such as grease or silicone oil, which brakes relative rotation. It can control.

The driven rotary member 11 is, for example, a gear 12 (see FIG. 3) as a driven rotary part engaged with a drive member such as a gear or a rack, and a lower side of the gear 12. The holding flange part 13 formed integrally, the outer cylindrical wall 14 formed integrally under the holding flange part 13 centering on the center of the gear part 12, and this outer cylindrical wall 14 The holding flange portion which is formed integrally with the holding flange portion 13 on the outer circumference of the lower end portion and holds the O-ring 31 by the holding flange portion 13 on the outer circumference of the outer cylindrical wall 14 ( 15 and an opening formed integrally with the center of the gear part 12 at the gear part 12, penetrating up and down inside the outer cylindrical wall 14, and communicating with the receiving part 41 in series. It consists of the inner cylindrical wall 16 as a cylindrical part which has a.

And the stepped part 16s which turns around is formed in the outer periphery of the upper end part of the inner cylindrical wall 16. As shown in FIG.

In addition, the inner circumference of the inner cylindrical wall 16 is located at the upper side of the six grooves 17 and the grooves 17 at equal intervals of, for example, 60 degrees extending from the lower end portion to the central portion position in the vertical direction. For example, the upper end becomes flat and the inclined surface that extends outward as the lower end goes downward is formed by the engaging circumferential groove 26 of the fixed support member 21, which is relatively rotatable. The engaging projection 18 (refer to FIG. 3) which is located at intervals of 180 degrees, and is positioned across the upper side of the engaging projection 18, to assemble the driven rotating member 11 and the fixed support member 21. At the same time, when the driven rotating member 11 and the fixed support member 21 restrict the interval in the rotational axis direction in which they rotate relatively, and are welded to close the upper end portion of the inner cylindrical wall 16, The blockage portion in which the inner cylindrical wall 16 is solidified ( The welding control part 19 (refer FIG. 3) which serves as the space regulation part which restricts 16c (refer FIG. 6) from contacting the central axis 25 of the fixed support member 21 mentioned later is formed integrally. have.

Moreover, chamfering is given to the outer periphery of the lower end of the holding | maintenance flange part 15, and the inner periphery of the lower part of the inner cylindrical wall 16. As shown in FIG.

The fixed support member 21 has a circular bottom wall 22, an outer cylindrical wall 23 (see Fig. 2) formed integrally with the outer circumference of the bottom wall 22, and an outer cylinder when viewed in plan view. An inner cylindrical wall formed concentrically with the wall 23 and inserted into an annular groove formed by the outer cylindrical wall 14 and the inner cylindrical wall 16 of the driven rotating member 11 ( 24 (see FIG. 2), and a central shaft 25 (see FIG. 2) integrally formed at the center of the bottom wall 22 and inserted into the inner cylindrical wall 16 of the driven rotating member 11. The attachment part 27 is integrally formed in the outer periphery of the bottom wall 22 by the interval of 180 degree | times, for example.

Then, the outer cylindrical wall 23 is formed with a stepped portion 23d for accommodating the retaining flange portion 15 of the driven rotating member 11 inwardly at the inner lower end thereof, and at the inner upper end thereof. The stepped part 23u which accommodates the holding flange part 13 of (11) rotatably inside is formed.

In addition, the center shaft 25 is chamfered to the outer periphery of the upper end, the engagement of the driven rotary member 11 on the outer periphery of the height corresponding to the engaging projection 18 of the driven rotary member (11). The projection 18 is formed with a locking circumferential groove 26 having a relatively rotatable upper end portion which is relatively rotatable and forms a complementary engagement portion.

In addition, the attachment portion 27 extends upward from one end of the bottom wall 22 and then extends upward, and extends outwardly from the bottom wall 22 and the retaining piece 28 having the retaining protrusion 28a on the outside of the upper end. And a holding member 29 held between the holding protrusions 28a, for example, a holding plate 29 having an interval between the holding plate E (see FIG. 6).

In FIG. 4, (H) shows a heating chip as a welding jig, and a recessed part which forms a part of the spherical surface which accommodates the upper side of the inner cylindrical wall 16 of the driven rotating member 11 at the lower end ( c) is formed, and the protrusion p is formed in the center of this recessed part c.

Next, an example of assembly of the rotary damper D is demonstrated.

First, as shown in FIG. 1, the fixed support member 21 is mounted on a work table, and a predetermined amount of viscous fluid 51 is formed in the annular recess formed by the outer cylindrical wall 23 and the inner cylindrical wall 24. As shown in FIG. Inject).

Then, the lower side of the driven rotating member 11 in which the O-ring 31 is held by the two retaining flange portions 13 and 15 on the outer side of the outer cylindrical wall 14, the central shaft 25 is the inner cylindrical wall. (16) is inserted into the fixed support member 21 as a guide.

In this way, when the lower side of the driven rotating member 11 is inserted into the fixed support member 21, the viscous fluid 51 and the air are compressed by the driven rotating member 11 and the fixed support member 21, It moves from the outer side to the inner side between the co-rotating member 11 and the fixed support member 21, and enters between the inner cylindrical wall portion 16 and the central shaft 25 through the groove 17.

In addition, since the air moves faster than the viscous fluid 51, air does not remain in the receiving portion 41 formed by the driven rotating member 11 and the fixed support member 21.

When the lower side of the driven rotating member 11 is inserted into the fixed support member 21 as described above, the retaining flange portion 15 is rotatable inside the outer cylindrical wall 23, as shown in FIG. The O-ring 31 is rotatably sealed between the outer cylindrical wall 23 and the outer cylindrical wall 14 by the driven rotating member 11 and the fixed supporting member 21.

In addition, as shown in FIG. 4, when the central shaft 25 enters the inner cylindrical wall 16 and passes over the engagement protrusion 18 and the tip portion contacts the welding restricting portion 19, the engagement protrusion ( 18 is plunged into the engaging circumferential groove 26 so that the engaging projection 18 is engaged with the engaging circumferential groove 26 as shown in FIG.

As shown in FIG. 4, in the state where the driven rotating member 11 is assembled to the fixed support member 21, a current is sent to the heating chip H to be heated, and as shown by the two-dot chain lines, the inside The upper end of the cylindrical wall 16 is placed in the recess c of the heating chip H, and the heating chip H is pressed down to melt and block the upper end of the inner cylindrical wall 16, and then heating By cooling off the chip H by air, it can be set as the rotary damper D of the state shown in FIG. 6, and assembly is complete | finished.

Next, an example of attachment of the rotary damper D will be described.

As shown in Fig. 6, the hole h formed in the skin attachment plate E, that is, the same circular shape as the bottom wall 22 of the fixed support member 21, and the attachment portion 27 at the opposite outer peripheral position of 180 degrees. ), The rotary damper (D) is attached to the skin attachment plate (E) by using a hole having a notch that can be inserted.

Next, the operation will be described.

First, when the driven rotary member 11 rotates, the driven rotary member 11 may be driven by the viscous resistance and shear resistance of the viscous fluid 51 positioned between the driven rotary member 11 and the fixed support member 21. Braking of 11).

Therefore, the gear part 12 of the driven rotating member 11 brakes rotation or movement of the gear, the rack, and the like to be engaged, thereby slowly rotating or moving the gear, the rack, and the like.

As described above, according to one embodiment of the present invention, the inner cylindrical wall 16 (opening) for forming the central portion of the receiving portion 41 to the atmosphere in the driven rotating member 11 is formed, Since the inner cylindrical wall 16 (opening) is closed after the co-rotating member 11 and the fixed support member 21 are assembled, unnecessary air is not collected in the accommodating portion 41, and assembling is facilitated. Since air does not mix in the viscous fluid 51, the torque precision can be made constant.

And, when assembling the driven rotary member 11 and the fixed support member 21, the gap restriction portion for regulating the interval in the rotation axis direction in which the driven rotary member 11 and the fixed support member 21 is relatively rotated Since {the welding regulation part 19} was formed in the driven rotation member 11, the space | interval of the driven rotation member 11 and the fixed support member 21 does not fluctuate, and torque precision can be made constant. have.

In addition, since the closing means for closing the inner cylindrical wall 16 (opening) was welded, the inner cylindrical wall 16 (opening) was reliably closed so that the viscous fluid 51 made the inner cylindrical wall 16 (opening). ) Can be prevented from leaking.

A central shaft 25 is formed at the center of the fixed support member 11, and an inner cylindrical wall 16 having an opening into which the central shaft 25 is inserted is formed in the driven rotation member 11. Since the welding regulation part 19 which controls the inner cylindrical wall 16 part which melted in the inner cylindrical wall 16 contact | connects the center axis | shaft 25 was formed, the molten inner cylindrical wall 16 part has a center axis | shaft. Attachment to (25) can be prevented, and the driven rotating member 11 and the fixed supporting member 21 can be reliably rotated.

In addition, between the inner circumference of the inner cylindrical wall 16 and the outer circumference of the central shaft 25, the driven rotation member 11 and the fixed support member 21 are restricted from moving in the direction of the rotation axis relatively rotated. Since the driven rotating member 11 and the fixed support member 21 form a relatively rotatable complementary engaging portion (the engaging projection 18, the engaging circumferential groove 26), the fixed supporting member 21 In addition, the driven rotating member 11 is hardly pulled out, and the driven rotating member 11 and the fixed supporting member 21 can be formed by the two-sided divided mold.

In addition, since the welding control portion 19 also serves as the space restriction portion, it is possible to have two functions in one component part, and the configuration can be simplified compared to the function.

Moreover, since the retaining flange part 15 is formed in the outer cylindrical wall 14, the O-ring 31 does not fall from the outer cylindrical wall 14, and assembly work can be performed easily.

And since the groove 17 was formed in the inner periphery of the inner cylindrical wall 16, the air in the accommodating part 41 is discharged | emitted from the inner cylindrical wall 16 along the groove 17 to air | atmosphere, and the accommodating part ( The viscous fluid 51 in the 41 enters between the inner cylindrical wall 16 and the inner cylindrical wall 24 along the groove 17, so that unnecessary air is not collected in the receiving portion 41, so that it is easier to assemble. In addition to this, air is not mixed in the viscous fluid 51, so that the torque accuracy can be made more constant.

FIG. 7 is an explanatory view showing another example of closing the inner cylindrical wall (opening), FIG. 8 is an explanatory view showing still another example of closing the inner cylindrical wall (opening), and FIG. 9 is a closing of the inner cylindrical wall (opening). It is explanatory drawing which shows another example to make, the same code | symbol is attached | subjected to the same or equivalent part as FIGS. 1-6, and the description is abbreviate | omitted.

In Fig. 7, reference numeral 16A denotes a cap made of synthetic resin, and the inner cylindrical wall 16 (opening) is closed by press-fitting the upper end of the inner cylindrical wall 16.

In Fig. 8, 16B denotes a cap made of synthetic resin, and the inner cylindrical wall 16 (opening) is closed by press-fitting into the upper end portion of the inner cylindrical wall 16.

In Fig. 9, 16C denotes a cap made of synthetic resin, and after fitting the circumferential protrusion 16p to the upper end of the inner cylindrical wall 16, it protrudes outward from the protrusion 16p. The inner cylindrical wall 16 (opening) is closed by caulking or welding the flange 16f.

In addition, also in the example shown to FIG. 7 and FIG. 8, you may weld cap 16A, 16B to the inner cylindrical wall 16. FIG.

In the above-described embodiment, an example of the configuration in which the opening to be connected to the receiving portion 41 in series and closing after the assembly is formed in the driven rotating member 11 is shown, but the inner cylindrical wall 16 shown in FIG. As shown in Fig. 10, a bottomed inner cylindrical wall (16 개방) is opened, and a groove (17) and engagement projections (18) are formed in the bottomed inner cylindrical wall (16Ⅹ), and When assembling the driven rotating member 11 and the fixed support member 21, the central shaft 25 is not set so as to contact the bottom of the inner cylindrical wall 16 벽 with the bottom, or the inner cylindrical with the bottom. When the driven rotary member 11 and the fixed support member 21 are assembled with the bottom of the wall 16Ⅹ as a gap restricting portion, the central shaft 25 abuts on the bottom of the bottomed inner cylindrical wall 16Ⅹ. In addition, a through hole 25t penetrating from the upper end to the lower end in the central axis 25 is provided. After assembling the driven rotating member 11 and the fixed support member 21, the through hole 25t may be closed by welding, or the upper end may be formed on the central axis 25 shown in FIG. A through hole 25t penetrating to the lower end portion may be formed as shown in Fig. 10, and the through hole 25t may be assembled and then closed by welding.

When the driven rotary member 11 and the fixed support member 21 are assembled, a gap regulating portion for regulating the interval in the rotation axis direction in which the driven rotary member 11 and the fixed support member 21 rotate relatively { Although the example of the structure which formed the welding control part 19 to the driven rotation member 11 was shown, as shown in FIG. 4 and FIG. 6, the outer cylindrical wall which the holding flange part 13 abuts ( The stepped portion 23u on the upper side of 23 may be used as the gap restriction portion.

Moreover, although the example of the complementary engaging part which formed the engaging protrusion 18 in the inner cylindrical wall 16, and formed the engaging peripheral groove 26 in the central axis 25 was shown, A groove may be formed and the engaging projection may be formed on the central axis.

In addition, although the example which used the sealing means as the O-ring 31 was shown, the sealing means may be a two-color shaping | molding of a relatively rotatable recessed part and convex part, or the convex part using a soft material.

According to the present invention, at least one side of the driven rotating member and the fixed support member is provided with an opening communicating with the atmosphere inside the sealing means of the receiving portion, and the opening is closed after assembling the driven rotating member and the fixed supporting member. Therefore, unnecessary air does not collect in the accommodating portion, so that assembly is facilitated, and air is not mixed in the viscous fluid, so that the torque precision can be made constant.

And, when assembling the driven rotating member and the fixed support member, at least one side of the driven rotating member and the fixed support member, the interval regulating portion for regulating the distance in the direction of the rotation axis in which the driven rotating member and the fixed support member is relatively rotated. Since the gap between the driven rotating member and the fixed support member does not fluctuate, the torque precision can be made constant.

In addition, since the closing means for closing the opening is welded, the opening can be reliably closed to prevent the viscous fluid from leaking out of the opening.

Then, a central axis is formed at the center of the fixed support member, and a cylindrical portion having an opening into which the central axis is inserted is formed in the driven rotating member, and the molten cylindrical portion is in contact with the central axis. Since the welding control part to be regulated is formed, the molten cylindrical portion can be prevented from adhering to the central axis, and the driven rotating member and the fixed supporting member can be reliably rotated.

In addition, between the inner circumference of the cylindrical portion and the outer circumference of the central shaft, the driven rotation member and the fixed support member are restricted from moving in the direction of the rotation axis relatively rotated, and the driven rotation member and the fixed support member are relatively rotatable. Since the complementary engaging portion is formed, the driven rotating member does not fall out with respect to the fixed supporting member, and the driven rotating member and the fixed supporting member can be formed by the two-sided divided mold.

In addition, since the welding control portion also serves as the space restriction portion, it is possible to have two functions in one component part, and the configuration can be simplified compared to the function.

Claims (6)

A driven rotating member integrally provided with a driven rotating part engaged with the driving member; A fixed support member for holding the driven rotating member freely to rotate; An annular receiving portion formed between the fixed support member and the driven rotating member; In the rotary damper is accommodated in the receiving portion, the rotary damper made of a viscous fluid for braking the relative rotation of the driven rotating member and the fixed support member, The fixed support member has a central axis, Forming sealing means for sealing the outer circumferential end of the accommodation portion so that the driven rotation member and the fixed support member can rotate relatively; An opening through at least one side of the driven rotating member and the fixed supporting member to allow air to enter the atmosphere inwardly from a sealing means of the accommodation portion, And the opening is closed after assembling the driven rotating member and the fixed supporting member. The method according to claim 1, When assembling the driven rotating member and the fixed support member, a gap regulating portion for regulating a distance in a rotation axis direction in which the driven rotating member and the fixed supporting member rotates relatively, the driven rotating member and the fixed supporting member Rotary damper, characterized in that formed on at least one side of the member. The method according to claim 2, A rotation damper, characterized in that the blocking means for closing the opening is welding. The method according to claim 3, Forming a central axis in the center of the fixed support member; A cylindrical portion having the opening through which the central axis is inserted into the driven rotating member; And a welding restricting portion for restricting the molten cylindrical portion from contacting the central axis in the tubular portion. The method according to claim 4, Between the inner circumference of the cylindrical portion and the outer circumference of the central axis, the driven rotation member and the fixed support member are restricted from moving in a rotational axis direction in which they rotate relatively, and the driven rotation member and the fixed support member A rotary damper, characterized in that a relatively rotatable complementary engaging portion is formed. The method according to claim 4 or 5, And said welding control part also serves as said gap control part.

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