JP4912953B2 - Rotary damper and method for manufacturing the same - Google Patents

Description

  The present invention relates to a rotary damper and a method for manufacturing the same.

  Conventionally, a partition wall provided between the main body case and the rotor, a viscous liquid filled in a chamber partitioned by the partition wall, a vane that rotates together with the rotor and presses the viscous liquid, and an opening of the main body case There is known a rotary damper having a lid for closing the part. Such a rotary damper reduces the rotational speed of the rotor by the resistance of the viscous liquid generated when the vane presses the viscous liquid.

  However, since the conventional rotary damper has a structure in which the peripheral edge of the lid is fixed to the main body case, when a large braking force is generated, a portion other than the peripheral edge of the lid is caused by the pressure of the viscous liquid from the peripheral edge. There was a problem that the lid was deformed so as to be raised, whereby the gap between the lid and the partition wall was enlarged, and the braking force was reduced.

  FIG. 3 of Patent Document 1 below describes a configuration in which a flange (260) is provided on a rotor (220) and the flange is interposed between a lid (212) and a partition wall (211e). According to such a configuration, deformation of the lid can be suppressed. However, in such a configuration, the volume of the chambers (230, 231) filled with the viscous liquid is reduced, resulting in a reduction in braking characteristics. Further, since the flange is pressed against the lid by the pressure of the viscous liquid and a frictional resistance is generated between the flange and the lid, there is a problem that the braking characteristics are not stable.

  FIG. 9 of Patent Document 1 below describes a configuration in which the thickness of the lid (420) is increased. Also with this configuration, deformation of the lid can be suppressed. However, such a configuration also reduces the volume of the chamber (460) filled with the viscous liquid, resulting in a reduction in braking characteristics.

  As described in Patent Document 1 below, in a conventional rotary damper, an O-ring is used to prevent the viscous liquid from leaking outside through a gap between the main body case and the lid. Therefore, the opening of the main body case is inevitably circular, and a main body case having an irregular opening cannot be employed.

  Patent Document 2 and Patent Document 3 below describe that the peripheral edge of the lid is welded to the main body case by ultrasonic welding. However, ultrasonic welding has a drawback that if a viscous liquid adheres to the welding location, it tends to cause poor welding. In the conventional welding method, even if there is a partial welding failure, it does not appear on the appearance, so it is difficult to detect the welding failure on the production line.

Japanese Patent Laid-Open No. 2002-372085 JP-A-5-240284 JP 2006-112538 A

  The problem to be solved by the present invention is to provide a rotary damper capable of suppressing deformation of the lid without reducing the volume of the chamber filled with the viscous liquid and thereby improving the braking characteristics, and a method for manufacturing the same. Is to provide.

In order to solve the above-described problems, the present invention provides the following rotary damper and method for manufacturing the same.
1. A partition provided between the body case and the rotor, a viscous liquid filled in a chamber partitioned by the partition, a vane that rotates together with the rotor and presses the viscous liquid, and an opening of the body case A rotary damper having a closing lid, wherein the lid is welded not only to the main body case but also to an end face of the partition wall.
2. 2. The rotary damper according to 1 above, wherein the lid is welded to the main body case and the partition wall by laser welding.
3. 3. The rotary damper as described in 2 above, wherein leakage of the viscous liquid through the gap between the main body case and the lid is prevented by a continuous weld portion formed by laser welding.
4). The lid has a convex part fitted into the chamber, and the convex part has an outer peripheral surface in contact with an inner peripheral surface of the main body case and a side surface in contact with a side surface of the partition wall. Or the rotary damper of 3.
5. 5. The rotary damper according to any one of 2 to 4, wherein a welding surface of the main body case and a welding surface of the partition wall are located at the same height.
6). A partition provided between the body case and the rotor, a viscous liquid filled in a chamber partitioned by the partition, a vane that rotates together with the rotor and presses the viscous liquid, and an opening of the body case A method of manufacturing a rotary damper having a lid to be closed, the method including a step of welding the lid not only to the main body case but also to an end face of the partition wall.
7). 7. The method of manufacturing a rotary damper according to claim 6, wherein the lid is welded to the main body case and the partition wall by laser welding.
8). 8. The method of manufacturing a rotary damper as described in 7 above, which includes a step of measuring the temperature of the part based on infrared rays emitted from the part heated by the laser beam at the time of laser welding.
9. The lid has a convex portion that fits into the chamber, and the convex portion includes an outer peripheral surface that is in contact with an inner peripheral surface of the main body case, and a side surface that is in contact with a side surface of the partition wall. 9. The method of manufacturing a rotary damper according to 7 or 8, wherein the lid is welded to the main body case and the partition wall after being fitted into the chamber.
10. The welding surface of the main body case and the welding surface of the partition wall are located at the same height, and after bringing the welding surface of the lid into contact with the welding surface, the lid is connected to the main body case and the partition wall. 10. The method for manufacturing a rotary damper according to any one of 7 to 9, wherein the rotary damper is welded to the rotary damper.

According to the first aspect of the present invention, since the lid is welded not only to the main body case but also to the end face of the partition wall , in addition to the peripheral edge portion of the lid being welded to the main body case, the radial direction of the lid Also, a welded portion (welded portion) between the lid and the partition wall is formed. Therefore, it is possible to reduce the degree of deformation of the lid due to the pressure of the viscous liquid as compared with the structure in which only the peripheral edge of the lid is welded to the main body case. As a result, it is possible to employ a thin lid, so that a sufficient volume of the chamber filled with the viscous liquid can be secured. In addition, since the lid is difficult to deform, a large braking force can be generated.
According to the second aspect of the present invention, even if a viscous liquid adheres to the welding location, it is possible to weld firmly.
According to the third aspect of the present invention, the bonding strength between the lid, the main body case, and the partition wall can be increased by the continuous welding portion formed by laser welding. Further, since the welded portion prevents the viscous liquid from leaking through the gap between the main body case and the lid, a sealing member such as an O-ring can be dispensed with. Further, since the O-ring is not required, the opening of the main body case does not need to be circular, and a main body case having a deformed opening can be employed.
According to the present invention described in 4 above, it is possible to suppress the generation of burrs by the convex portions provided on the lid. Moreover, it can prevent that a viscous liquid adheres to a welding location by this convex part.
According to the fifth aspect of the present invention, since the welding surface of the main body case and the welding surface of the partition wall are located at the same height, the degree of adhesion between the welding surface and the welding surface of the lid is increased. It becomes possible to weld more firmly.
According to the sixth aspect of the present invention, there is provided a rotary damper capable of suppressing the deformation of the lid without reducing the volume of the chamber filled with the viscous liquid and thereby improving the braking characteristics. Is possible.
According to the present invention described in 7 above, it is possible to eliminate welding defects caused by the viscous liquid adhering to the welding location, and to firmly weld the lid.
According to the present invention described in 8 above, when a welding failure occurs partially, it can be detected on the production line.
According to the ninth aspect of the present invention, since the generation of burrs can be suppressed, it is possible to prevent the rotation failure of the rotor caused by the burrs being mixed into the viscous liquid. Moreover, since adhesion of the viscous liquid to a welding location can be prevented, generation | occurrence | production of a welding defect can be prevented more reliably.
According to the tenth aspect of the present invention, even in mass production, the degree of adhesion between the welding surface of the lid and the welding surface of the main body case and the partition wall is less likely to vary, and the degree of adhesion is high. This makes it possible to produce a large quantity of products with good grades.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings.

  1 is a plan view showing a rotary damper according to a first embodiment of the present invention, FIG. 2 is a front view showing the rotary damper according to the first embodiment, FIG. 3 is a sectional view taken along a line CC in FIG. 2, and FIG. 1 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 5 is a cross-sectional view taken along the line BB in FIG. 1, and FIG. As shown in these figures, the rotary damper according to the first embodiment includes a partition wall 3 provided between the main body case 1 and the rotor 2, and a viscous liquid filled in a chamber 4 partitioned by the partition wall 3. The vane 5 rotates together with the rotor 2 to press the viscous liquid, and the lid 6 closes the opening of the main body case 1.

  The main body case 1 has one end opened and the other end closed by a bottom wall 1a. The rotor 2 has a first groove 2a at one end and a second groove 2b at the other end. As shown in FIG. 4, the rotor 2 has a protrusion 1b protruding from the bottom wall 1a of the main body case 1 in the first groove 2a, and a protrusion protruding from the lower surface of the lid 6 in the second groove 2b. When 6a is fitted, it is rotatably supported in the main body case 1. In the vicinity of the first groove 2 a and the second groove 2 b, an O-ring is provided in order to prevent the viscous liquid from leaking outside through the gap between the main body case 1 and the rotor 2 and the gap between the lid 6 and the rotor 2. 7 is disposed. The partition wall 3 is formed integrally with the main body case 1. The vane 5 is formed integrally with the rotor 2.

  The lid 6 is welded not only to the main body case 1 but also to the partition wall 3. As a welding method, a conventionally known welding method can be employed. A preferred welding method is laser welding. In the present embodiment, in order to weld the lid 6 to the main body case 1 and the partition wall 3 by laser welding, the lid 6 has a property of transmitting laser light, and the main body case 1 and the partition wall 3 are made of laser. It consists of a material that absorbs light. As the lid 6, the main body case 1 and the partition wall 3, it is preferable to use those made of thermoplastic resins having the same melting point.

  For laser welding, it is preferable to use an apparatus that can irradiate an object to be welded with laser light and can measure the temperature of the part based on infrared rays emitted from the part heated by the laser light during laser welding. . In the present embodiment, as shown in FIG. 7, an apparatus in which a laser beam output unit 8 and an infrared input unit 9 are integrally formed is used. The irradiation angle of the laser beam 10 output from the laser beam output unit 8 is adjusted so as to be refracted in the middle, and is irradiated on the upper surface of the lid 6, passes through the lid 6 and reaches the main body case 1 or the partition wall 3. The main body case 1 or the partition wall 3 is heated. Infrared rays 11 generated when the main body case 1 or the partition walls 3 are heated by the laser beam 10 are input to the infrared input unit 9 as shown in FIG. The temperature of the welded portion (welded portion) 12 is measured based on the infrared rays 11 input to the infrared input portion 9. According to this apparatus, it is possible to irradiate the laser beam 10 and input the infrared ray 11 on the same axis, so that the temperature of the welded portion 12 can be measured simultaneously with the welding.

  When the lid 6 is placed on the main body case 1 and the peripheral edge of the lid 6 is irradiated with the laser beam 10, as shown in FIG. 6, the welded portion is formed at the portion where the lower surface of the lid 6 and the end surface of the main body case 1 are in contact 12 is formed. Such a welded portion 12 is preferably formed continuously on the outer peripheral end surface of the main body case 1 and on the end surface of the partition wall 3 as indicated by a thick line in FIG. 3. Thereby, leakage of the viscous liquid through the gap between the main body case 1 and the lid 6 is prevented.

  The lid 6 is welded by laser welding after bringing the welding surface of the lid 6 into contact with the welding surface of the main body case 1 and the welding surface of the partition wall 3, but there is a gap between the welding surfaces facing each other at the time of welding. If there is, it will cause poor welding, so it is desirable that the welding surfaces facing each other at the time of welding are in close contact with each other. Here, the welding surface refers to a surface to be welded using laser light. If the welding surface of the main body case 1 and the welding surface of the partition wall 3 are located at different heights, the welding of the lid 6 is performed. Since the surfaces also have height differences corresponding to them, a gap is likely to occur between the welding surfaces facing each other during welding. In particular, in mass production, variations in quality are likely to occur due to a mixture of those with and without gaps. In this respect, in the present embodiment, as shown in FIGS. 3 and 4, the welding surface of the main body case 1 and the welding surface of the partition wall 3 are located at the same height, so that the height of the welding surface of the lid 6 is high. Since there is no difference and the welding surfaces without any difference in height are brought into contact with each other, the adhesion degree between the welding surfaces of the main body case 1 and the partition wall 3 and the welding surface of the lid 6 becomes very high. In addition, even in mass production, the degree of adhesion between the welded surfaces hardly varies, so that a product with a good degree of welding can be produced in large quantities.

  In the rotary damper configured as described above, when the vane 5 rotates together with the rotor 2 and presses the viscous liquid, the viscous liquid moves through a slight gap between the vane 5 and the main body case 1. At this time, resistance of the viscous liquid is generated, and the rotational speed of the rotor 2 is reduced by the resistance.

  When attempting to exert a large braking force on the rotary damper, a large pressure of the viscous liquid is applied to the lower surface of the lid 6. At this time, according to the present embodiment, the lid 6 is welded not only to the main body case 1 but also to the partition wall 3, the welded portion 12 with the main body case 1 is formed at the peripheral edge of the lid 6, and the lid 6 Since the welded portion 12 of the lid 6 and the partition wall 3 is also formed in the radial direction, the degree of deformation of the lid 6 is very small as compared with the structure in which only the peripheral edge of the lid 6 is welded to the main body case 1. . Therefore, by adopting the thin lid 6, it is possible to secure a sufficient volume of the chamber 4 filled with the viscous liquid and to generate a large braking force.

  In addition, according to the present embodiment, since the lid 6 is welded to the main body case 1 and the partition wall 3 by laser welding, even if viscous liquid adheres to the welding location, the adhesion of the viscous liquid is not required unless the amount is large. Therefore, the lid 6 can be firmly welded without causing poor welding.

  Moreover, according to the present Example, the joining strength of the lid | cover 6, the main body case 1, and the partition 3 can be raised with the continuous welding part 12 formed by laser welding. Moreover, since the welded portion 12 prevents the viscous liquid from leaking through the gap between the main body case 1 and the lid 6, an O-ring provided between the lid 6 and the main body case 1 can be eliminated. Further, since the O-ring is not required, the opening of the main body case 1 does not need to be circular, and the main body case 1 having an irregularly shaped opening can be employed as shown in FIG.

  Further, according to the present embodiment, the rotary damper manufacturing process includes a step of measuring the temperature of the part based on the infrared rays 11 emitted from the part heated by the laser beam 10 during laser welding. If a welding failure occurs, it can be detected on the production line. That is, when the lid 6 and the main body case 1 or the lid 6 and the partition wall 3 are sufficiently and reliably welded, the surfaces to be welded adhere to each other to release heat, so that the temperature near the melting point is measured. However, when the welding is insufficient, there is a gap between the surfaces to be welded, so heat cannot be released and a temperature higher than the melting point is measured. Therefore, if a temperature relatively higher than the melting point is measured, it can be determined that a welding failure has occurred and can be eliminated on the production line.

  9 is a plan view showing a rotary damper according to a second embodiment of the present invention, FIG. 10 is a front view showing the rotary damper according to the second embodiment, FIG. 11 is a sectional view taken along the line DD in FIG. 10, and FIG. FIG. 13 is a cross-sectional view taken along line AA in FIG. 9, FIG. 14 is a cross-sectional view taken along line BB in FIG. 9, FIG. 15 is a cross-sectional view taken along line CC in FIG. Is a bottom view of the lid employed in the embodiment, FIG. 17 is a front view of the lid employed in the embodiment, FIG. 18 is a sectional view taken along the line F-F in FIG. 16, and FIG. is there. As shown in these drawings, the rotary damper according to the second embodiment is different from the rotary damper according to the first embodiment in that the lid 6 has a convex portion 6 b that fits into the chamber 4.

  The convex portion 6b includes an outer peripheral surface 6c (see FIGS. 16 and 17) that contacts the inner peripheral surface 1c (see FIG. 12) of the main body case 1 and a side surface 6d (see FIG. 16) that contacts the side surface 3a (see FIG. 12) of the partition wall 3. 17), and as shown in FIG. 16, it is formed in a shape having substantially the same outline as the opening of the main body case 1 (the opening of the chamber 4).

  In this embodiment, the convex portion 6b is fitted into the chamber 4, the welding surface of the lid 6 is brought into contact with each welding surface of the main body case 1 and the partition wall 3, and then the main body case 1 and the partition wall 3 are bonded by laser welding. To be welded.

  The welding surface of the main body case 1 and the welding surface of the partition wall 3 are located at the same height as in the first embodiment. However, according to the present embodiment, unlike the first embodiment, the welding portion is formed by the convex portion 6b. It is possible to reliably prevent the viscous liquid from adhering to the surface. That is, in the structure where the lid 6 does not have the convex portion 6b, the liquid surface of the viscous liquid filled in the chamber 4 and the welding surfaces of the main body case 1 and the partition wall 3 are positioned at substantially the same height. There is a possibility that the viscous liquid overflows from the chamber 4 and adheres to the welding surfaces in a large amount. When a large amount of viscous liquid adheres to the welding surface, poor welding occurs even by laser welding. In this respect, in this embodiment, since the convex portion 6b fits into the chamber 4, the viscous liquid can be prevented from overflowing from the chamber 4, so that the viscous liquid adheres to the welding surfaces of the main body case 1 and the partition wall 3. It is possible to reliably prevent the occurrence of poor welding.

  In addition, as shown in FIG. 20, in the structure in which the lid 6 does not have the convex portion 6b, a burr 13 that protrudes from the chamber 4 may occur in the vicinity of the welded portion 12 after welding. And when this burr | flash 13 falls and mixes in a viscous liquid, the burr | flash 13 will be clogged between the rotor 2 and the partition 3, or between the main body case 1 and the vane 5, and obstruct | rotate rotation of the rotor 2, A rotation failure of the rotor 2 is generated. In this respect, in the present embodiment, since the protrusion 6b fits into the chamber 4 and the generation of the burr 13 can be suppressed, the rotation failure of the rotor 2 caused by the burr 13 being mixed into the viscous liquid is prevented. Can be prevented.

1 is a plan view illustrating a rotary damper according to Embodiment 1. FIG. 1 is a front view showing a rotary damper according to Embodiment 1. FIG. It is CC sectional view taken on the line in FIG. It is an AA section sectional view in FIG. It is a BB section sectional view in FIG. It is the D section enlarged view in FIG. FIG. 5 is a schematic diagram for explaining a method for manufacturing the rotary damper according to the first embodiment. FIG. 5 is a schematic diagram for explaining a method for manufacturing the rotary damper according to the first embodiment. 6 is a plan view showing a rotary damper according to Embodiment 2. FIG. 6 is a front view showing a rotary damper according to Embodiment 2. FIG. It is the DD sectional view taken on the line in FIG. It is EE section sectional drawing in FIG. FIG. 10 is a cross-sectional view taken along line AA in FIG. 9. FIG. 10 is a cross-sectional view taken along the line BB in FIG. 9. FIG. 10 is a cross-sectional view taken along a line CC in FIG. 9. FIG. 6 is a bottom view of a lid employed in Example 2. 6 is a front view of a lid employed in Example 2. FIG. It is FF section sectional drawing in FIG. It is the G section enlarged view in FIG. It is a figure for demonstrating the effect | action of the lid | cover employ | adopted in Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case 1a Bottom wall 1b Protrusion 2 Rotor 2a 1st groove | channel 2b 2nd groove | channel 3 Bulkhead 4 Chamber 5 Vane 6 Lid 6a Protrusion 6b Convex part 7 O-ring 8 Laser light output part 9 Infrared input part 10 Laser light 11 Infrared 12 welding part 13 burr

Claims (10)

A partition provided between the body case and the rotor, a viscous liquid filled in a chamber partitioned by the partition, a vane that rotates together with the rotor and presses the viscous liquid, and an opening of the body case A rotary damper having a closing lid, wherein the lid is welded not only to the main body case but also to an end face of the partition wall.   The rotary damper according to claim 1, wherein the lid is welded to the main body case and the partition wall by laser welding.   The rotary damper according to claim 2, wherein leakage of the viscous liquid through the gap between the main body case and the lid is prevented by a continuous welding portion formed by laser welding.   The said cover has a convex part which fits into the above-mentioned room, and this convex part has the outer peripheral surface which touches the inner peripheral surface of the body case, and the side surface which touches the side of the partition. The rotary damper according to 2 or 3.   The rotary damper according to any one of claims 2 to 4, wherein a welding surface of the main body case and a welding surface of the partition wall are positioned at the same height. A partition provided between the body case and the rotor, a viscous liquid filled in a chamber partitioned by the partition, a vane that rotates together with the rotor and presses the viscous liquid, and an opening of the body case A method of manufacturing a rotary damper having a lid to be closed, the method including a step of welding the lid not only to the main body case but also to an end face of the partition wall.   The method for manufacturing a rotary damper according to claim 6, wherein the lid is welded to the main body case and the partition wall by laser welding.   8. The method of manufacturing a rotary damper according to claim 7, further comprising a step of measuring the temperature of the part based on infrared rays emitted from the part heated by the laser beam at the time of laser welding.   The lid has a convex portion that fits into the chamber, and the convex portion includes an outer peripheral surface that is in contact with an inner peripheral surface of the main body case, and a side surface that is in contact with a side surface of the partition wall. 9. The method of manufacturing a rotary damper according to claim 7, wherein the lid is welded to the main body case and the partition wall after being fitted into the chamber.   The welding surface of the main body case and the welding surface of the partition wall are located at the same height, and after bringing the welding surface of the lid into contact with the welding surface, the lid is connected to the main body case and the partition wall. The method of manufacturing a rotary damper according to claim 7, wherein the rotary damper is welded to the rotary damper.

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