JP6226720B2 - Rotary damper - Google Patents

Description

  The present invention relates to a rotary damper that can increase rotational resistance.

  In various fields such as home appliances and business devices, a mechanism is used in which a lid is pivotally supported on a main body by a hinge portion, and the lid opens and closes by turning around the axis of the hinge portion. If the rotational resistance of the hinge portion is small, the lid body may open and close at a high rotational speed, and in this case, the lid body and the main body may be damaged. For this reason, in order to prevent the lid from opening and closing at a high rotational speed, a rotary damper having a predetermined rotational resistance may be used in the hinge portion. Further, the rotary damper is used in various parts that require rotational resistance other than the hinge part.

  Patent Document 1 listed below describes an example of such a rotary damper. The rotary damper described in Patent Document 1 has a configuration in which a rotating shaft rotates in an outer cylinder. A plurality of substantially circular movable plates extending in a direction perpendicular to the shaft are fixed to the rotating shaft along the longitudinal direction of the shaft. In addition, a plurality of fixed plates that are inserted between the movable plates are fitted into the outer cylindrical body, thereby being integrated with the outer cylindrical body. The space between the outer cylinder and the rotating shaft is filled with the viscous liquid, so that the space between the movable plate and the fixed plate is also filled with the viscous liquid. In such a rotary damper, when the rotating shaft rotates with respect to the outer cylinder, the movable plate rotating together with the rotating shaft and the fixed plate integrated with the outer cylinder are relatively opposed to each other. Rotate. For this reason, rotational resistance is generated by the shear resistance of the viscous liquid between the movable plate and the fixed plate.

Japanese Patent No. 3148343

  However, there is a demand for a rotary damper having a larger rotational resistance. Then, an object of this invention is to provide the rotary damper which can enlarge rotational resistance.

  In order to solve the above problems, a rotary damper according to the present invention includes a cylindrical housing, a cylindrical rotor that is inserted into the housing and is rotatable with respect to the housing, and is inserted into the rotor. A shaft that is locked to the housing in a non-rotatable state with respect to the housing, and a resistance liquid that is filled in the housing. A plurality of first resistance plates extending in a direction perpendicular to the direction and arranged along the longitudinal direction, wherein the rotor includes at least one second resistance disposed between the plurality of first resistance plates. The plate is locked.

  In the rotary damper having such a configuration, the set of the rotor and the second resistance plate locked to each other and the set of the shaft and the housing locked to each other are relatively rotatable. When rotating in this way, shear resistance is generated by the resistance liquid. This shear resistance occurs in at least three places. The first shear resistance is generated between the outer peripheral surface of the rotor and the inner peripheral surface of the housing. The second shear resistance is generated between the outer peripheral surface of the first resistance plate (the outer peripheral surface of the shaft) and the inner peripheral surface of the rotor. The third shear resistance is generated between the first resistance plate and the second resistance plate.

  Thus, compared with the multistage rotary damper described in Patent Document 1, the first shear resistance is added. Therefore, according to the rotary damper of the present invention, the rotational resistance can be increased by the amount of the first shear resistance.

  Each of the first resistance plates is formed with a first defective portion, and each of the second resistance plates has the first rotation plate in a state where the shaft and the rotor are at a predetermined rotational position. It is preferable that the second defect portion is formed at a position overlapping the defect portion.

  By forming the first defect portion and the second defect portion in this manner, when the shaft and the rotor are in the rotational position, the first defect portion and the second defect portion cause the longitudinal direction of the shaft. A space that communicates with each other is created. Such a space can function as an air vent for moving the bubbles in the longitudinal direction even when bubbles are generated in the state where the housing is filled with the resistance liquid.

  Furthermore, it is preferable that the second resistance plate is disposed so as to communicate from the outside to the inside of the rotor, and the second defect portion is formed from the outside of the rotor to a position overlapping with the first defect portion.

  Even if the above-mentioned air bubbles are generated in the housing by connecting the inside and outside of the rotor with the space created by the second defect portion, the second defect portion moves the air bubbles to the outside of the rotor. Can function as a road.

  In this case, it is preferable that the second defect portion is a notch formed on the outer peripheral side of the second defect portion. By forming the second defect portion by the notch, the second defect portion can be easily formed.

  Moreover, it is preferable that the said 1st defect | deletion part is made into the notch formed in the outer peripheral side of the said 1st resistance board. By forming the first defect portion by the notch, the first defect portion can be easily formed.

  The rotor is preferably provided with a plurality of slits, and the second resistance plate is inserted into the slits to be locked to the rotor.

  Thus, the number of the 2nd resistance boards inserted in a slit can be changed for every rotary damper manufactured by latching a 2nd resistance board. That is, the number of second resistance plates can be easily adjusted, and the rotation resistance can be easily adjusted.

  In addition, it is preferable that a plurality of the second resistance plates are arranged at symmetrical positions with respect to the rotation axis of the rotor.

  By arranging the second resistance plate in this way, stress due to rotational resistance is applied to the symmetrical position of the outer peripheral surface of the rotor with respect to the rotational axis of the rotor, and the stress can be prevented from being biased. . Therefore, the life of the rotary damper can be extended.

  As described above, according to the present invention, a rotary damper capable of increasing the rotational resistance is provided.

It is a disassembled perspective view of the rotary damper which concerns on embodiment of this invention. It is the figure which looked at FIG. 1 from another viewpoint. It is sectional drawing of the rotary damper of FIG. It is a figure which shows a mode that the shaft and the 2nd resistance board were integrated in the rotor.

  Hereinafter, preferred embodiments of a rotary damper according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view of the rotary damper of the present embodiment, and FIG. 2 is a view of FIG. 1 viewed from another viewpoint. As shown in FIGS. 1 and 2, the rotary damper 1 of the present embodiment includes a housing 10, a rotor 20, a shaft 30 having a first resistance plate 32, a second resistance plate 40, an O-ring 52, and a cap. 51 and a resistance liquid as main components. In FIGS. 1 and 2, the housing 10, the rotor 20, and the shaft 30 relatively move along the common central axis C along the longitudinal direction of the housing 10, the rotor 20, and the shaft 30, and the second The state of the rotary damper disassembled by the resistance plate 40 moving in the direction perpendicular to the central axis C is shown, and the resistance liquid is omitted. FIG. 3 is a sectional view taken along the central axis C of the rotary damper 1. In FIG. 3, even if a slight gap is formed, the gap may not be described.

  Hereinafter, the shaft 30, the rotor 20, the second resistance plate 40, the housing 10, and other configurations will be described in this order.

<Shaft 30>
The shaft 30 mainly includes an axial core 31 extending along the central axis C, a plurality of first resistance plates 32, and a fitting convex portion 36 formed at an end of the axial core 31. The plurality of first resistance plates 32 are arranged along the central axis C at a predetermined interval and connected to the shaft core 31. The predetermined interval is slightly larger than the thickness of the second resistance plate 40. Each of the first resistance plates 32 has a substantially circular shape extending along a direction perpendicular to the longitudinal direction of the shaft core 31, and a pair of notches at positions different from each other by 180 degrees with respect to the central axis C. The 1st defect | deletion part 35 which consists of is formed. The first defect portion 35 formed in each first resistance plate 32 is formed at the same position in each first resistance plate 32. That is, the first defect portion 35 formed in each first resistance plate 32 is formed so as to overlap along the longitudinal direction of the shaft 30 (the direction of the central axis C).

  An axial core 31 protrudes from the first resistance plate 32 located at one end among the plurality of first resistance plates 32. Further, a fitting convex portion 36 is connected to the first resistance plate 32 located at the other end. The fitting convex portion 36 has a non-circular shape when viewed along the central axis C, and is generally elliptical in this embodiment. In the present embodiment, the shaft core 31, the first resistance plate 32, and the fitting convex portion 36 are integrated.

<Rotor 20>
The rotor 20 has a cylindrical side wall portion 21 centering on the central axis C and a front wall portion 22 that closes an opening on one side of the side wall portion 21 as main components, and the front wall portion 22 of the side wall portion 21. The opposite side is open. A second fixing portion 24 is provided on the front wall portion 22 so as to protrude to the side opposite to the space side in the side wall portion 21. Further, as shown in FIG. 3, a bearing recess 17 is formed on the opposite side of the front wall portion 22 from the second fixing portion 24 side. The bearing recess 17 has a diameter into which the shaft 31 of the shaft 30 can be inserted.

  The side wall portion 21 has a length that allows the shaft 30 to be inserted except for the fitting convex portion 36 of the shaft 30. Further, the inner diameter is slightly larger than the diameter of the first resistance plate 32 of the shaft 30, and when the shaft 30 is inserted into the rotor 20, the outer peripheral surface (the outer peripheral surface of the shaft 30) and the side wall of the first resistance plate 32. A slight gap is generated between the inner peripheral surface of the portion 21.

  The side wall portion 21 is formed with a plurality of slits 25 that are arranged at predetermined intervals along the direction of the central axis C and extend along a plane perpendicular to the central axis C. The slits 25 are also formed at symmetrical positions with respect to the central axis C in the direction perpendicular to the central axis C. In the present embodiment, a pair of slits are formed at positions different by 180 ° in the direction perpendicular to the central axis C. The predetermined interval in which the slits 25 are arranged is approximately the same as the thickness of the first resistance plate 32 of the shaft 30. Further, the width of the slit 25 is equal to a predetermined interval at which the first resistance plate 32 of the shaft 30 is disposed. Therefore, the width of the slit 25 is slightly larger than the thickness of the second resistance plate 40. Further, the positions where the plurality of slits 25 are formed are between the first resistance plates 32 in the direction perpendicular to the central axis C in a state where the shaft 30 is inserted into the rotor 20 as shown in FIG. Overlapping position. Therefore, in this state, the first resistance plate 32 of the shaft 30 overlaps with the side wall portion 21 between the slits 25 in a direction perpendicular to the central axis C with a slight gap.

  In addition, an air vent slit 26 extending along the direction of the central axis C is formed in the slit 25 formed on the side of the side wall portion 21 closest to the front wall portion 22. The air vent slit 26 reaches the outer surface side of the front wall portion 22 (the side on which the second fixing portion 24 is formed).

  As described above, with the shaft 30 inserted into the rotor 20, the shaft core 31 protruding from the first resistance plate 32 of the shaft 30 enters the bearing recess 17, and the shaft 30, the rotor 20, Can rotate around a central axis C. Further, the fitting convex portion 36 projects from the opening of the side wall portion 21 in a state where the shaft 30 is inserted into the rotor 20.

<Second resistance plate 40>
The second resistance plate 40 includes an outer portion 42 that substantially coincides with a partial circle having a shape in which a part of a circle is cut off by a straight line, and a substantially rectangular inner portion 41. The diameter of the arc-shaped outer edge of the outer portion 42 is the same as the outer diameter of the side wall portion 21 of the rotor 20. In addition, a second deficient portion 45 is formed in the outer portion 42. The second missing portion 45 is formed by cutting away from the outer edge on the arc of the outer portion 42 toward the inner portion 41. In addition, a bearing portion 46 formed of an arc-shaped notch is formed on the side opposite to the outer side portion 42 side of the inner side portion 41. The diameter of the arc of the bearing portion 46 is slightly larger than the diameter of the shaft core 31 of the shaft 30. The inner portion 41 has a width that can be inserted into the slit 25 formed in the side wall portion 21 of the rotor 20. On the other hand, the width of the outer portion 42 is a width that cannot enter the rotor 20 from the slit 25.

  FIG. 4 is a view of the state in which the shaft 30 and the second resistance plate 40 are incorporated in the rotor 20 as viewed from the opening side of the rotor 20. For easy understanding, the fitting convex portion 36 of the shaft 30 is omitted in FIG. Further, in FIG. 4, even if a slight gap is formed, the gap may not be described. As described above, the width of the slit 25 formed in the rotor 20 and the interval between the first resistance plates 32 of the shaft 30 are slightly larger than the thickness of the second resistance plate 40. Therefore, when the second resistance plate 40 is inserted into the slit 25 from the inner side 41 side, the inner side 41 is located between the first resistance plates 40 as shown in FIGS. Is caught on the side wall 21 of the rotor 20. Thus, at least one second resistance plate 40 is disposed between the plurality of first resistance plates 32 and is locked to the rotor 20.

  In a state where the second resistance plate 40 is locked to the rotor 20, a slight gap is generated between the second resistance plate 40 and the first resistance plate 32 of the shaft 30. In this state, a slight gap is also generated between the bearing portion 46 and the shaft core 31 of the shaft 30. Further, the outer edge of the outer side portion 42 of the second resistance plate 40 is flush with the outer peripheral surface of the side wall portion 21 of the rotor 20. Further, the second chipped portion of the second resistance plate 40 and the air vent slit 26 overlap in the direction along the central axis C. Further, in a state where the shaft 30 and the rotor 20 are in a predetermined rotational position, the second missing portion 45 is along the first missing portion 35 formed in the first resistance plate 32 of the shaft 30 and the central axis C. It reaches the position where it overlaps with the direction. That is, the second defect portion 45 is formed so as to communicate from the outside of the rotor 20 to a position overlapping the first defect portion 35 on the inside. As described above, since the first defect portion 35 formed in each first resistance plate 32 is formed so as to overlap along the longitudinal direction of the shaft 30, the first defect portion 35 and the second defect portion 45. Thus, a space communicating along the longitudinal direction of the shaft 30 is formed. Furthermore, since the second defect portion 45 overlaps the air vent slit 26, the first defect portion 35, the second defect portion 45, and the air vent slit 26 allow the space substantially along the longitudinal direction of the central axis C to be a rotor. 20 leads from the inside to the outside.

<Housing 10>
The housing 10 has a cylindrical side wall part 11 centering on the central axis C and a back wall part 12 that closes an opening on one side of the side wall part 11 as main components, and the back wall part 12 of the side wall part 11. The opposite side is open. The side wall 11 has a length that allows the side wall 21 of the rotor 20 to be completely inserted. The inner diameter is slightly larger than the outer diameter of the side wall 21 of the rotor 20, and when the rotor 20 is inserted into the housing 10 as shown in FIG. 3, the outer peripheral surface of the side wall 21 of the rotor 20 and the housing A slight gap is created between the inner peripheral surface of the ten side wall portions 11. Therefore, the rotor 20 and the housing 10 can rotate around the central axis C with the rotor 20 inserted into the housing 10.

  The back wall portion 12 is formed with a first fixing portion 14 having a convex portion. As shown in FIG. 3, a fitting recess 16 is formed on the inner wall portion side of the back wall portion 12. The fitting concave portion 16 can be fitted with the fitting convex portion 36 of the shaft 30 and is non-circular when viewed along the central axis C. In the present embodiment, since the shape when viewed along the central axis of the fitting convex portion 36 is substantially elliptical as described above, the shape when viewing the fitting concave portion 16 along the central axis is also Although not particularly shown, it is generally elliptical.

<Other configurations>
The O-ring 52 is configured to block the inner peripheral surface of the side wall 11 of the housing 10 and the outer peripheral surface of the rotor 20 in a state where the rotor 20 is inserted into the housing 10. The O-ring 52 is made of an elastic body in order to improve the sealing performance. Examples of such an elastic body include synthetic rubber such as NBR (Nitril-Butadiene Rubber). The cap 51 is a fixed cap formed from a hard resin or metal, and prevents the O-ring 52, the rotor 20 and the like from being detached from the housing 10.

  The inside of the housing 10 is filled with the resistance liquid without a gap. As the resistance liquid, a so-called viscous liquid is generally used, but the type can be selected according to the rotational resistance of the rotary damper 1. Examples of the resistance liquid include mineral oils and synthetic oils such as silicone oils.

  Next, assembly of the rotary damper 1 will be described.

  First, as shown in FIG. 1, the shaft 30 and the rotor 20 are arranged so that the central axes C coincide with each other, and the shaft 30 is inserted into the rotor 20. At this time, the shaft core 31 protruding from one side of the shaft 30 is inserted into the bearing concave portion 17 of the rotor 20, and the fitting convex portion 36 projects from the opening of the side wall portion 21. And between the 1st resistance plates 32 of the shaft 30 and the slit 25 of the rotor 20 overlap in the direction perpendicular to the central axis C.

  Next, the 2nd resistance board 40 is inserted in the slit 25 from the inner side part 41 side, and the 2nd resistance board 40 is latched to the rotor 20 as mentioned above. At this time, it is only necessary to insert at least one second resistance plate 40, and it is not necessary to insert the second resistance plate 40 into all of the plurality of slits 25. Thus, by adjusting the number of the second resistance plates 40 locked to the rotor 20, the rotational resistance of the rotary damper 1 described later can be adjusted. In addition, if the 2nd resistance board 40 is arrange | positioned in the symmetrical position on the basis of the rotating shaft (center axis C) of the rotor 20, it will be in the symmetrical position of the outer peripheral surface of the rotor 20 on the basis of the rotating shaft of the rotor 20. It is preferable because stress due to rotational resistance is applied and stress can be prevented from being biased.

  Next, the rotational positions of the shaft 30 and the rotor 20 are adjusted so that the first missing portion 35 and the second missing portion 45 overlap along the direction of the central axis C. Thereafter, the rotor 20 in a state where the shaft 30 is inserted and the second resistance plate 40 is locked is inserted into the housing 10 in which the resistance liquid is placed. When the rotor 20 is inserted into the housing 10, the fitting convex portion 36 of the shaft 30 is fitted into the fitting concave portion 16 of the housing 10. As described above, the fitting concave portion 16 and the fitting convex portion are non-circular when viewed along the central axis C, and therefore the shaft 30 is not rotatable with respect to the housing 10 in a state where both are fitted. Is done. Thus, the shaft 30 is locked to the housing 10 so as not to rotate.

  Further, even when bubbles are generated in the resistance liquid when the rotor 20 is inserted into the housing 10, the bubbles pass through the space formed by the first defect portion 35 and the second defect portion 45, and the rotor 20. It is possible to escape in the longitudinal direction, and at the same time, it is possible to escape from the second defect 45 to the outside of the rotor 20. Thus, the first defect portion 35 and the second defect portion 45 can function as an air vent path. Since the air vent slit 26 is connected to the slit 25 on the most front wall 22 side of the rotor 20 as described above, the second missing portion 45 of the second resistance plate 40 on the most front wall 22 side. Therefore, air such as bubbles can escape to the air vent slit 26 of the rotor 20. Therefore, even after the rotor 20 is inserted into the housing 10, the bubbles in the housing 10 can escape to the outside of the housing 10.

  After the rotor 20 is inserted into the housing 10, aging for air bleeding is performed at a predetermined temperature for a predetermined period with the opening side of the housing 10 facing up. Aging may be performed at room temperature, or may be performed in a temperature-controlled room at a predetermined temperature so that the resistance liquid is reduced in viscosity and air can be easily removed. This aging is not essential. After the necessary aging process is completed, the O-ring 52 is sealed so that the resistance liquid does not leak, and the cap 51 is engaged with the opening of the housing 10 to complete the assembly of the rotary damper 1.

  Next, the operation of the rotary damper 1 will be described.

  The rotary damper 1 is used as a part of home appliances or business equipment. When the rotary damper 1 is used, the first fixing portion 14 and the second fixing portion 24 are respectively fixed to members that rotate with respect to each other, such as a device. Then, stresses that rotate relative to each other are applied to the first fixing portion 14 and the second fixing portion 24.

  When a force is applied so that the first fixed portion 14 and the second fixed portion 24 rotate with each other, the housing 10 and the shaft 30 locked so as not to rotate with each other, and the rotor with which the second resistance plate 40 is locked. Rotate with each other. At this time, shear resistance is generated by the resistance liquid. The shear resistance is generated between the members that move with each other, but in the rotary damper 1, shear resistance is mainly generated at the following three locations.

  The first shear resistance is generated between the outer peripheral surface of the rotor 20 and the inner peripheral surface of the housing. As described above, a slight gap is formed between the outer peripheral surface of the side wall portion 21 of the rotor 20 and the inner peripheral surface of the side wall portion 11 of the housing 10, and this gap is filled with the resistance liquid. Therefore, when the rotor 20 and the housing 10 are relatively rotated, a shear resistance is generated between the outer peripheral surface of the side wall portion 21 and the inner peripheral surface of the side wall portion 11 that are relatively moved.

  The second shear resistance is generated between the outer peripheral surface of the first resistance plate 32 (the outer peripheral surface of the shaft 30) and the rotor 20. As described above, a slight gap is formed between the outer peripheral surface of the first resistance plate 32 and the inner peripheral surface of the side wall portion 21 of the rotor 20, and this gap is filled with the resistance liquid. Therefore, when the shaft 30 and the rotor 20 are relatively rotated, a shear resistance due to the resistance liquid is generated between the outer peripheral surface of the first resistance plate 32 and the inner peripheral surface of the side wall portion 21.

  The third shear resistance is generated between the first resistance plate 32 and the second resistance plate 40. As described above, a slight gap is generated between the second resistance plate 40 and the first resistance plate 32 of the shaft 30 in a state where the second resistance plate 40 is locked to the rotor 20. Is filled with resistance solution. Further, since the second resistance plate 40 is locked to the rotor 20, the second resistance plate 40 rotates together with the rotor 20. Therefore, when the shaft 30 and the rotor 20 are relatively rotated, a shear resistance due to the resistance liquid is generated between the first resistance plate 32 and the second resistance plate 40.

  Further, since a slight gap is formed between the second resistance plate 45 and the shaft core 31 of the shaft 30, shear resistance is generated.

  As described above, according to the rotary damper 1 of the present embodiment, at least three shear resistances are generated. Therefore, according to the rotary damper of the present invention, the rotational resistance can be increased.

  Moreover, the magnitude | size of said 3rd shear resistance can be adjusted by adjusting the number of the 2nd resistance boards 40 inserted from the slit 25 as mentioned above, As a result, the rotational resistance of the rotary damper 1 is adjusted. Can be adjusted.

  As mentioned above, although the said embodiment was demonstrated to the example about the rotary damper of this invention, this invention is not limited to the rotary damper 1 of the said embodiment, It can deform | transform suitably.

  For example, the second resistance plate 40 is inserted from the slit 25 formed in the rotor 20 and fixed to the rotor 20. However, the present invention is not limited to such a configuration. For example, the second resistance plate may be inserted into the rotor in a state where the second resistance plate is disposed between the first resistance plates of the shaft. In this case, in a state where the shaft and the second resistance plate are inserted into the rotor, the convex portion provided on the second resistance plate is fitted into the concave portion provided on the inner wall of the rotor, and the second resistance plate is the rotor. What is necessary is just to comprise so that it may be latched by.

  Moreover, in the said embodiment, although the shaft 30 was latched by the housing 10 because the fitting convex part 36 was engage | inserted by the fitting recessed part 16, latching with the shaft 30 and the housing 10 is performed by another method. It may be broken.

  Moreover, the 1st defect | deletion part 35 formed in the 1st resistance board 32 and the 2nd defect | deletion part 45 formed in the 2nd resistance board 40 are not essential. Moreover, the 1st defect | deletion part 35 may be formed with the hole instead of a notch, and the 2nd defect | deletion part 45 may be formed with the hole. However, it is preferable that both the first defect portion 35 and the second defect portion 45 are formed by notching because the respective defect portions can be easily formed. In particular, it is preferable that the second defect 45 is formed from the outer side to the inner side of the rotor 20 from the viewpoint of bleeding.

  Moreover, the shape of the 1st fixing | fixed part 14 and the 2nd fixing | fixed part 24 is not specifically limited.

  As described above, according to the present invention, a rotary damper capable of increasing the rotational resistance is provided, which is used for an apparatus having a lid that rotates with respect to the main body, an apparatus having a rotating member, or the like. be able to.

DESCRIPTION OF SYMBOLS 1 ... Rotary damper 10 ... Housing 11 ... Side wall part 12 ... Back wall part 14 ... 1st fixing | fixed part 16 ... Fitting recessed part 17 ... Recessed part 20 for bearings Rotor 21 ... Side wall part 22 ... Front wall part 24 ... Second fixing part 25 ... Slit 26 ... Slit for air bleeding 30 ... Shaft 31 ... Axle core 32 ... 1st resistance board 35 ... 1st defect | deletion part 36 ... fitting convex part 40 ... 2nd resistance board 41 ... inner side part 42 ... outer side part 45 ... 2nd defect | deletion part 46. ..Bearing part 51 ... Cap 52 ... O-ring

Claims (7)

A tubular housing;
A cylindrical rotor inserted into the housing and rotatable relative to the housing;
A shaft inserted into the rotor and locked to the housing in a non-rotatable state with respect to the housing;
A resistance liquid filled in the housing;
With
The shaft has a plurality of first resistance plates that extend in a direction perpendicular to the longitudinal direction of the shaft at a position in the rotor and are arranged along the longitudinal direction;
At least one second resistance plate disposed between the plurality of first resistance plates is locked to the rotor ,
Each of the first resistance plates is formed with a first defect portion,
Each of the second resistance plates has a second defect portion formed at a position overlapping the first defect portion in a state where the shaft and the rotor are in a predetermined rotational position.
The second resistance plate is arranged to communicate from the outside to the inside of the rotor,
The rotary damper, wherein the second defect portion is formed from the outside of the rotor to a position overlapping the first defect portion . The second defect is rotary damper according to claim 1, characterized in that it is notched to be formed from the outer peripheral side of the second resistive plate. 3. The rotary damper according to claim 1, wherein the first defect portion is a notch formed on an outer peripheral side of the first resistance plate. A tubular housing;
A cylindrical rotor inserted into the housing and rotatable relative to the housing;
A shaft inserted into the rotor and locked to the housing in a non-rotatable state with respect to the housing;
A resistance liquid filled in the housing;
With
The shaft has a plurality of first resistance plates that extend in a direction perpendicular to the longitudinal direction of the shaft at a position in the rotor and are arranged along the longitudinal direction;
At least one second resistance plate disposed between the plurality of first resistance plates is locked to the rotor,
The rotor is provided with a plurality of slits,
It said second resistive plate, said by being inserted into the slit, features and to Carlo Taridanpa to be engaged with the rotor. A tubular housing;
A cylindrical rotor inserted into the housing and rotatable relative to the housing;
A shaft inserted into the rotor and locked to the housing in a non-rotatable state with respect to the housing;
A resistance liquid filled in the housing;
With
The shaft has a plurality of first resistance plates that extend in a direction perpendicular to the longitudinal direction of the shaft at a position in the rotor and are arranged along the longitudinal direction;
At least one second resistance plate disposed between the plurality of first resistance plates is locked to the rotor,
It said second resistor plate, features and to Carlo Taridanpa to be more disposed at symmetrical positions relative to the rotational axis of the rotor. Each of the first resistance plates is formed with a first defect portion,
Each of the second resistance plates is formed with a second defect portion at a position overlapping the first defect portion in a state where the shaft and the rotor are at a predetermined rotational position. Item 6. The rotary damper according to Item 4 or 5 . The second resistance plate is arranged to communicate from the outside to the inside of the rotor,
The rotary damper according to claim 6, wherein the second defect portion is formed from the outside of the rotor to a position overlapping the first defect portion.

Images