JP2013019444A - Rotating damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating damper which can prevent erroneous assembling by using one kind of a rotating member irrespective of whether the rotational direction in which large torque is generated is oriented to the left or right.SOLUTION: A valve member is arranged at the tip of a blade so as to be relatively movable with respect to the blade within a prescribed range in the circumferential direction of a shaft of the rotating member, the blade is formed so as to have an asymmetric shape with respect to a line segment which divides a length in the axial direction in half, and only when the valve member is assembled to the blade in a correct assembling direction, the valve member is formed into a shape which receives the tip of the blade and in which relative movement with respect to the blade within the prescribed range in the circumferential direction of the shaft is permitted.

Description

  The present invention relates to a rotary damper used for rotating shafts such as a keyboard cover of a piano and a toilet seat / toilet lid of a toilet, and more particularly to a structure that prevents erroneous assembly of a valve member in a fluid control mechanism of the rotary damper. .

  Rotating dampers with different braking torques depending on the direction of rotation of the shaft member that rotatably supports the lid, etc., are used for the piano keyboard lid, the toilet seat / toilet lid, etc. . As a result, when opening, the lid or the like can be opened with a light force, and when closing, the lid or the like does not fall suddenly and the hand or the like is not injured, and damage to the device or the like can be prevented.

  Many of the rotary dampers configured in this manner are provided with a shaft member that is relatively rotatable with respect to the casing in a casing that contains a viscous fluid, and blades that are formed to protrude radially outward from the shaft member. The flow of the viscous fluid in the viscous fluid passage formed between the tip surface of the part and the inner peripheral surface of the casing is controlled by the movement of the valve member attached to the tip of the blade part. In this fluid control mechanism, if the valve member attached to the tip of the blade portion is mistakenly attached in the direction opposite to the predetermined attachment direction, the torque characteristics of the braking torque will be reversed. For this reason, in the rotary damper in which the braking torque is varied depending on the rotation direction, it is necessary to prevent erroneous assembly of the valve member of the fluid control mechanism.

  An invention in consideration of this point is described in Patent Document 1. In this prior art, a projection that protrudes toward the other member is provided on one side in the circumferential direction of the shaft member of either the blade portion or the valve member, and the projection receiving portion that can receive the projection on the other side. Is formed so as to allow the valve member to move in the circumferential direction within a predetermined range, and when the valve member is assembled to the blade member in the normal assembly direction, the valve member is normally assembled. When assembled in the reverse assembling direction, the mating member has no protrusion receiving portion so that the valve member cannot be normally assembled to the blade member.

JP 2007-327578 A

  However, in the case of a rotary damper in which the braking torque is varied depending on the rotation direction of the shaft member, even when the basic structure as the rotation damper is the same, the braking torque is increased when the rotation direction of the shaft member relative to the casing is the right rotation. In some cases, the braking torque is increased during the left rotation. This is determined by the position of the rotary damper attached to an article such as a piano lid, a toilet seat, or a toilet lid, and the mounting position varies depending on the manufacturer of the final product. As a manufacturer of the rotary damper, it is necessary to satisfy the requirements of the final product manufacturer. For this purpose, in the valve structure shown in Patent Document 1, a protrusion or protrusion on the right side of the blade portion in the circumferential direction of the shaft member. It is necessary to prepare two types of shaft members, one provided with a receiving portion and one provided with a protrusion or a protrusion receiving portion on the left side of the blade portion.

  This means that since the shaft member is manufactured by molding, two types of molding dies are required. The shaft member is larger than the valve member, the material is mainly zinc alloy or hard plastic, and the structure is extremely complicated compared to the valve member. That is, the shaft member is housed in the casing from one end to the other end, a connecting portion with a device such as a piano lid to which the rotary damper is attached, a sealing material attaching portion for preventing oil leakage from the casing, and the casing. Shaft part, blade part projecting radially outward from the outer peripheral surface of the shaft part toward the inner peripheral surface of the casing, shaft end part supported by the bearing part of the casing bottom wall, etc. It is built. For these reasons, the shaft member mold is very expensive. For this reason, in the conventional configuration shown in Patent Document 1 in which two types of expensive shaft member molds need to be prepared for each type of rotary damper, the manufacturing cost is high. The present invention has been made to solve these problems.

In order to solve the above problems, the present invention comprises a casing filled with a viscous fluid and a rotating member partially inserted into the casing, and the casing is provided on the inner peripheral surface along the axial direction. A blade portion projecting radially outward and having a convex wall projecting radially outward, the rotating member being provided along the axial direction on the outer peripheral surface of the shaft portion inserted into the casing and projecting radially outward A valve member is mounted at the tip of the blade, and the valve member increases the braking torque when the shaft rotates relative to the casing in one direction, and rotates relative to the other. In the rotary damper in which the flow of the viscous fluid in the fluid passage between the tip of the blade portion and the inner peripheral surface of the casing is controlled so as to reduce the braking torque of
The valve member is provided at the tip of the blade part so as to be movable relative to the blade part in a predetermined range in the circumferential direction of the shaft part,
Forming the blade portion to have an asymmetric shape with respect to a line segment that bisects the axial length;
Only when the valve member is assembled to the blade portion in a normal assembly direction, the blade member receives the tip of the blade portion and the blade portion in the predetermined range in the circumferential direction of the shaft portion. Provided is a rotary damper characterized in that it is formed in a shape that allows relative movement with respect to.

  The configuration in which the blade portion is formed to have an asymmetric shape with respect to a line segment that bisects the length in the axial direction is an uneven shape in the radial direction of the shaft portion, or a circumferential direction of the shaft portion The concavo-convex shape provided symmetrically to the left or right, or a combination of these shapes is configured to be different on one side and the other side with respect to a line segment that bisects the axial length of the blade portion. .

  According to the present invention, the blade portion of the rotating member is formed to have an asymmetric shape with respect to the line segment that bisects the axial length, and the valve member is normally assembled to the blade portion. Only when assembled in the direction, the tip of the blade portion is received, and the shaft portion is formed into a shape that is allowed to move relative to the blade portion in the predetermined range in the circumferential direction. Even if there is a case where the braking torque is increased when the rotation direction of the rotating member relative to the casing is the right rotation and a case where the braking torque is increased when the rotation direction is the left rotation, one type of rotation member can be used. There is no need to prepare two types of rotating members. Instead, two types of valve members will be prepared, but since the valve member is smaller and simpler in shape than the rotating member, the valve member mold is extremely cheap compared to the rotating member mold, The manufacturing cost of the rotary damper can be greatly reduced.

The disassembled perspective view which shows the rotating member and valve member of the rotary damper which concern on Example 1 of this invention. It is a longitudinal cross-sectional view of the rotary damper of FIG. 1, and is a figure which shows only a rotation member with a front view. (A), (b), (c) is a cross-sectional view along the lines AA, BB, CC, and BB in FIG. 2, respectively, and (d) is the valve member. Sectional drawing along the BB line at the time of fluid passage opening | release. The figure which is a one-side front view of the rotating member when the valve member is assembled incorrectly, and shows the valve member in a longitudinal section. Sectional drawing along the DD line of the rotating member and valve member of FIG. It is the front view of the rotating member which concerns on Example 2 of this invention, and is the figure which carried out the longitudinal cross-section of the valve member. . (A), (b) is the EE sectional view taken on the line of FIG. 6 in the state which the valve member of Example 2 obstruct | occluded the fluid passage, respectively. (A), (b) is the same figure as (a), (b) of Drawing 7 in the state where the valve member of Example 2 opened the fluid passage, respectively. The figure similar to FIG. 4 when the valve member of Example 2 is mistakenly assembled. The same figure as Fig.7 (a) in the state which the valve member of Example 2 obstruct | occluded the fluid channel | path. The figure similar to FIG. 2 of the rotary damper which concerns on Example 3 of this invention. (A), (b) is sectional drawing which followed the HH line | wire of FIG. 11, and the JJ line | wire in the state which the valve member of Example 3 obstruct | occluded the fluid passage, respectively. The figure similar to FIG. 4 when the valve member of Example 3 is misassembled. Sectional drawing along the KK line | wire of the rotation member and valve member of FIG. The top view of the rotation member of the rotation damper concerning Example 4 of the present invention. The figure similar to FIG. 2 of the rotary damper which concerns on Example 4 of this invention. (A), (b) is sectional drawing along the II line of FIG. 16, and the MM line in the state which the valve member of Example 4 opened the fluid channel, respectively. The figure similar to FIG. 4 when the valve member of Example 4 is mistakenly assembled. Sectional drawing along the NN line | wire of the rotating member and valve member of FIG. The top view of the rotating member of the rotary damper which concerns on Example 5 which is the 1st modification of Example 1 of this invention. The longitudinal cross-sectional view similar to FIG. 2 of the rotation damper which accommodated the rotation member of FIG. FIG. 22 is a transverse cross-sectional view of the rotary damper of FIG. 21 along the line OO similar to FIG. The figure similar to FIG. 4 when the valve member is misassembled in the 1st modification of Example 1 made into Example 6 of this invention. FIG. 24 is a cross-sectional view of the rotating member and the valve member in FIG. 23 taken along the line P-P. The top view of the rotating member of the rotary damper which concerns on Example 6 which is a 2nd modification of Example 1 of this invention. FIG. 26 is a transverse cross-sectional view of the rotating member in FIG. 25 taken along line QQ. The longitudinal cross-sectional view similar to FIG. 2 of the rotation damper which accommodated the rotation member of FIG. FIG. 28 is a transverse cross-sectional view of the rotary damper of FIG. 27 along the line RR similar to FIG. The figure similar to FIG. 4 when the valve member is misassembled in the 2nd modification of Example 1 made into Example 6 of this invention. FIG. 30 is a cross-sectional view of the rotating member and the valve member in FIG. 29 along the line SS.

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

  1 to 5 show a rotary damper according to Embodiment 1 of the present invention. As shown in the cross-sectional view of FIG. 3, the casing 1 includes a casing 1 filled with a viscous fluid, and a rotating member 10 in which a shaft portion 7 is inserted into the casing 1. And a convex wall 1a projecting inward in the radial direction. As can be seen from FIG. 1, the rotating member 10 includes a connecting portion 3 with a device such as a piano lid to which the rotating damper is attached, an attaching portion 5 of a sealing material R for preventing oil leakage from within the casing 1, and the casing 1. The shaft portion 7 accommodated in the shaft 7, the blade portion 9 provided along the axial direction on the outer peripheral surface of the shaft portion 7 and projecting radially outward toward the inner peripheral surface of the casing 1, and the bearing of the bottom wall of the casing 1 The shaft end portion 11 is supported by the portion 1b. The valve member 20 is attached to the tip of the blade portion 9 of the rotating member 10 and controls the flow of the viscous fluid F in the fluid passage P between the tip of the blade portion 9 and the inner peripheral surface of the casing 1.

  A recess 91 that forms part of the fluid passage P is formed in the blade portion 9 of the rotating member 10 shown in FIG. The radial tip of the blade 9 is divided into a radial tip 92a at one axial end (right side in the figure) 92 and a radial tip 93a at the other end (left side in the figure) 93 by the recess 91. In the illustrated example, a convex portion 95 that protrudes radially outward of the shaft portion 7 from the distal end 93 a is formed only at the radial distal end 93 a of the other end portion 93. Thereby, the front-end | tips 92a and 93a of the blade | wing part 9 have an asymmetrical shape with respect to the line segment hh which bisects the length L of an axial direction.

  In the illustrated example, the convex portion 95 is formed at substantially the center in the longitudinal direction of the radial tip 93 a of the other end 93 and over the entire width of the tip 93 a, but the convex 95 is formed by the radial tip 93 a of the other end 93. It may be biased in any one of the longitudinal directions. In short, the blade portion 9 is different in one end portion and the other end portion in the axial direction, and is formed to have an asymmetric shape with respect to a line segment hh that bisects the axial length L. Just do it.

  The valve member 20 is attached to the blade portion 9 of the rotating member 10 and is stored in the casing 1. The top wall 2 is in contact with the inner peripheral surface of the casing 1 and one end side in the circumferential direction of the shaft portion 7. The drooping wall 4a and the drooping wall 4b on the other end side, and the drooping wall 4a on the one end side have a recessed portion 6 forming another part of the fluid passage. Between both the hanging walls 4a and 4b is a groove 12 in which the blade portion 9 of the rotating member 10 is accommodated. A hole 8 penetrating the top wall 2 is formed at the center in the width direction of the valve member 20 at one end portion (left end in FIGS. 1 and 2) in the longitudinal direction of the top wall 2.

  As shown in FIG. 2, the hole 8 provided in the valve member 20 is formed in the tip 93 on the other end side of the blade portion 9 of the rotating member 10 when the valve member 20 is assembled in the normal assembly direction. The formed convex part 95 is received, and the valve member 20 can be accommodated in the casing 1 together with the rotating member 10. The hole 8 has a dimension in the width direction of the valve member 20, that is, a dimension in the rotation direction of the rotating member 10, and a dimension in the width direction of the blade portion 9 of the convex portion 95, that is, a dimension in the rotating direction of the rotating member 10. When the valve member 20 moves in the circumferential direction of the shaft portion 7 with respect to the blade portion 9, the hole 8 does not hinder this movement.

  As shown in FIG. 3, the groove 12 between the two hanging walls 4a and 4b of the valve member 20 has a gap S between the blade portion 9 and the two hanging walls 4a and 4b in a state where the blade portion 9 is housed. Due to the presence of the gap S, the rotating member 10 is within a predetermined range between the position shown in FIGS. 3A, 3B, and 3C and the position shown in FIG. The shaft portion 7 is attached to the blade portion 9 so as to be movable in the circumferential direction. The flow of the viscous fluid F in the fluid passage P between the tip of the blade portion 9 and the inner peripheral surface of the casing 1 is controlled by the movement of the valve member 20 in the circumferential direction of the shaft portion 7.

  3 (a), 3 (b), and 3 (c), the rotary member 10 does not have the recessed portion 6 of the valve member 20 while the rotary member 10 rotates relative to the casing 1 in the left direction in the figure. A state is shown in which the wall 4b is in close contact with the blade portion 9 by fluid pressure. At this time, the fluid passage P formed by the recessed portion 6 of the valve member 20 and the recessed portion 91 of the blade portion 9 is substantially blocked by the hanging wall 4b and the flow of the viscous fluid is restricted, and the rotating member 10 is greatly braked. Torque acts. On the other hand, FIG. 3D shows that the rotating member 10 rotates in the right direction in the drawing relative to the casing 1, and the hanging wall 4 a having the recessed portion 6 of the valve member 20 is moved to the blade portion 9 by the fluid pressure. The close contact state is shown. At this time, a gap S is formed between the vertical wall 4b and the blade portion 9, and this gap S communicates with the recessed portion 6 of the valve member 20 and the recessed portion 91 of the blade portion 9 to open the fluid passage P. The braking torque acting on the rotating member 10 is small.

  4 and 5 show a state in which the valve member 20 is assembled to the blade portion 9 in the wrong assembly direction. In this state, the valve member 20 is assembled such that the end portion in the longitudinal direction without the hole 8 is positioned on the convex portion 95 of the blade portion 9, so that the valve member 20 rides on the convex portion 95. In this state, the valve member 20 cannot be housed in the casing 1 together with the rotating member 10.

  6 to 10 show a rotary damper according to Embodiment 2 of the present invention. The same reference numerals are used for the same members as those of the rotary damper according to the first embodiment.

  As shown in FIGS. 7 to 8, the rotating member 30 has a blade portion 39 projecting radially outward along the axial direction on the outer peripheral surface of the shaft portion 37. The tip in the radial direction excluding the connecting portion with the portion 37 is formed to have a circular cross section. As shown in FIG. 6, nothing is provided on one end side (right side in the figure) of the blade portion 39, but on the other end side (left side in the figure), the shaft portion 37 extends from the radial front end. A convex portion 395 protruding outward in the radial direction is formed at the center of the blade portion 39 in the width direction. That is, also in the second embodiment, as in the first embodiment, the vane portion 39 and the other end portion in the axial direction have an asymmetric shape with respect to the line segment that bisects the axial length. The ends are formed with different shapes.

  Referring again to FIGS. 7 to 8, the valve member 40 is formed with a concave portion having a circular cross section along the longitudinal direction on the inner surface side facing the blade portion 39, which matches the round outer surface of the radial tip of the blade portion 39. Has been. As a result, the valve member 40 has a predetermined range around the radial tip of the blade portion 39 having a circular cross section, that is, in the circumferential direction of the shaft portion 37 due to the action of the viscous fluid when the rotating member 30 rotates relative to the casing 1. And is attached to the blade portion 39 so as to be freely rotatable. 7A and 7B show a state in which the shaft portion 47 rotates to the left relative to the casing 1 and the valve member 40 is in a position to block the fluid passage between the casing inner peripheral surface. 8 (a) and 8 (b), the shaft portion 47 is rotated to the right relative to the casing 1, and the valve member 40 is in a position to open a fluid passage between the casing inner peripheral surface. Indicates the state.

  The outer surface side of the valve member 40 has, on one side (right side in the figure) of the blade portion 39, a round wall portion 44a having a small fluid resistance and a small pressure receiving area, and having the round wall shape 44a having a small fluid resistance. (Left side in the figure) has a flat wall portion 44b having a large pressure receiving area that receives a large fluid resistance. Further, on the outer surface side of the valve member 40, both sides of the blade portion 39 are disposed at a portion in contact with the inner peripheral surface of the casing 1 when being accommodated in the casing 1, along the longitudinal direction substantially at the center in the longitudinal direction. It has a recess 46 that forms a fluid passage there between. Further, a hole 48 penetrating the inner and outer surfaces is formed at one end portion (left end in the illustrated example) in the longitudinal direction of the valve member 40.

  As shown in FIG. 6, the hole 48 provided in the valve member 40 is formed at the tip on the other end side of the blade portion 39 of the rotating member 30 when the valve member 40 is assembled in the normal assembly direction. The convex member 395 is received, and the valve member 40 can be housed in the casing 1 together with the rotating member 30. In addition, the hole 48 has a dimension in the width direction of the valve member 40, that is, a dimension in the rotation direction of the rotating member 30, and a dimension in the width direction of the blade portion 39 of the convex portion 395, that is, a dimension in the rotating direction of the rotating member 30. Largely formed. For this reason, when the valve member 40 moves in the circumferential direction of the shaft portion 37 with respect to the blade portion 39, the hole 48 does not prevent this movement.

  The valve member 40 is configured as described above, and is attached to the blade portion 39 so as to be movable in the circumferential direction of the shaft portion 37 of the rotating member 30 within a predetermined range as described above. The flow of the viscous fluid F between the tip of the portion 39 and the inner peripheral surface of the casing 1 is controlled. That is, while the rotating member 30 rotates in the left direction in FIGS. 7A and 7B, the flat wall portion 44b receives the fluid pressure and rotates around the blade portion 39 in the right direction. Nearly in close contact with the inner peripheral surface of the casing (not shown), the fluid passage between the valve member 20 and the casing inner surface is substantially blocked to restrict the flow of the viscous fluid, and a large braking torque acts on the rotating member 30. On the other hand, when the rotating member 30 rotates rightward in FIGS. 8A and 8B, the viscous fluid enters between the round wall portion 44 a of the valve member 40 and the casing inner peripheral surface (not shown), and the valve member 40. Is rotated around the blade 39 in the left direction. At this time, the recess 46 communicates both sides of the blade member 39 between the valve member 40 and the inner peripheral surface of the casing, thereby opening the fluid passage and reducing the braking torque acting on the rotating member 10.

  9 and 10 show a state in which the valve member 40 is assembled to the blade portion 39 in the wrong assembly direction. In this state, the valve member 40 is assembled so that the longitudinal end portion without the hole 48 is positioned on the convex portion 395 of the blade portion 39, so that the valve member 40 is placed on the convex portion 395. In this state, the valve member 40 cannot be housed in the casing 1 together with the rotating member 30.

  11 to 14 show a rotary damper according to a third embodiment of the present invention. The same reference numerals are used for the same members as those of the rotary damper according to the first embodiment.

  The rotary damper according to the third embodiment is configured in substantially the same manner as the rotary damper according to the first embodiment. That is, the blade portion 59 of the rotating member 50 has a recessed portion 591 that forms a part of the fluid passage, and the radial tip of the blade portion 59 has a diameter on one end side in the axial direction (right side in FIG. 11). It is divided into a directional tip 592 and a radial tip 593 on the other end side (left side in FIG. 11). The blade portion 59 of the rotating member 50 of the third embodiment differs from the first embodiment in that the radial tip 593 on the other end side (left side in FIG. 11) in the illustrated example is on one end side (right side in FIG. 11). And having convex portions 595 and 595 ′ which are formed thicker than the radial tip 592 and project symmetrically toward both circumferential directions of the shaft portion 57. That is, the blade portion 59 is formed by making the shape of one end portion and the other end portion in the axial direction different so as to have an asymmetric shape with respect to a line segment that bisects the length in the axial direction.

  The valve member 60 is formed in substantially the same manner as in the first embodiment. That is, as shown in FIG. 12B, the valve member 60 includes a top wall 62 that contacts the inner peripheral surface of the casing 1 when housed in the casing 1, and one end side in the circumferential direction of the shaft portion 57. The hanging wall 64a and the hanging wall 64b on the other end side are provided, and a groove 68 in which the blade portion 59 of the rotating member 50 is accommodated is provided between the hanging walls 64a and 64b. The hanging wall 64a on one end side in the circumferential direction has a recessed portion 66 that forms another part of the fluid passage. The difference from the first embodiment is that the width of the groove 68 at the longitudinal end portion (left end in FIG. 11) of the top wall 62 corresponding to the convex portions 595 and 595 ′ of the blade portion 59 is thick. In other words, it is formed wider than the normal width of the opposite end (right end in FIG. 11) so that 'can be stored.

  As shown in FIGS. 11 and 12, when the valve member 60 is assembled to the blade portion 59 of the rotating member 50 in the normal assembly direction, the groove 68 is located on the other end side radial tip of the blade portion 59. The convex portions 595 and 595 ′ formed on the 593 are received, and the valve member 60 can be housed in the casing 1 together with the rotating member 50. The groove 68 has a dimension in the width direction of the valve member 60, that is, a dimension in the rotation direction of the rotating member 50, and a dimension in the width direction of the blade portion 59 of the convex portions 595 and 595 ′, that is, in the rotating direction of the rotating member 50. It is formed larger than the dimension. For this reason, when the valve member 60 moves in the circumferential direction of the shaft portion 57 with respect to the blade portion 59, the groove 68 does not prevent this movement.

  The valve member 60 is configured as described above, and is attached to the blade portion 59 so as to be movable in the circumferential direction of the shaft portion 57 of the rotating member 50 within a predetermined range as in the first embodiment. The flow of the viscous fluid F between the inner peripheral surface of 1 is controlled.

  13 and 14 show a state in which the valve member 60 is assembled to the blade portion 59 in the wrong assembly direction. In this state, the valve member 60 is assembled so that the longitudinal end portion having the normal width of the groove 68 is positioned on the circumferential circumferential convex portions 595 and 595 ′ of the blade portion 59. As shown in FIG. 14, the valve member 60 is on the convex portions 595 and 595 ′, and the valve member 60 cannot be housed in the casing 1 together with the rotating member 50 in this state.

  15 to 19 show a rotary damper according to Embodiment 4 of the present invention. The same reference numerals are used for the same members as those of the rotary damper according to the first embodiment.

  The rotary damper according to the fourth embodiment is configured in substantially the same manner as the rotary damper according to the third embodiment. That is, as shown in FIGS. 15 and 16, the blade portion 79 of the rotating member 70 has a recessed portion 791 that forms a part of the fluid passage, and the radial tip of the blade portion 79 is axially formed by the recessed portion 791. It is divided into a radial tip 792 on one end side (right side in FIGS. 15 and 16) and a radial tip 793 on the other end side (left side in FIG. 11).

  The blade portion 79 of the rotating member 70 of the fourth embodiment is different from the third embodiment in that the radial tip 792 on one end side (the right side in FIGS. 15 and 16) in the illustrated example is a plan view of FIG. In the figure, it is formed in a trapezoidal shape with a narrow width extending from the right end to the left, and the radial tip 793 on the other end side (left side in FIGS. 15 and 16) is one end side in plan view of FIG. It is formed in a trapezoidal shape with a wide width from the right side (right side in FIGS. 15 and 16). That is, the radial tip 793 on the other end side (the left side in FIGS. 15 and 16) and the radial tip 792 on the one end side (the right side in FIGS. 15 and 16) having a narrow trapezoidal shape in plan view. In comparison, it has circumferential convex portions 795 and 795 ′ which are formed wide and project symmetrically toward both circumferential directions of the shaft portion 77.

  The valve member 80 is formed in substantially the same manner as in the third embodiment. That is, as shown in FIG. 17B, the valve member 80 includes a top wall 82 that contacts the inner peripheral surface of the casing 1 when housed in the casing 1, and one end side in the circumferential direction of the shaft portion 77. The hanging wall 84a and the hanging wall 84b on the other end side are provided, and a groove 88 in which the blade portion 79 of the rotating member 70 is received is located between the both hanging walls 84a and 84b. The hanging wall 84a on one end side in the circumferential direction has a recessed portion 86 forming another part of the fluid passage. Further, the width of the groove 88 at the longitudinal direction end portion (the left end in FIGS. 15 and 16) corresponding to the convex portions 795 and 795 ′ of the blade portion 759 is also substantially the same as in the third embodiment. That is, it is formed wider than the narrow end portion on the opposite side (the right end in FIGS. 15 and 16) so that the portions 795 and 795 ′ can be accommodated.

  As shown in FIGS. 16 and 17, when the valve member 80 is assembled to the blade portion 79 of the rotating member 70 in the normal assembly direction, the groove 88 is in the radial direction on the other end side of the blade portion 79. The convex portions 795 and 795 ′ formed at the tip 793 are received, and the valve member 80 can be housed in the casing 1 together with the rotating member 70.

  The valve member 80 is configured as described above, and is attached to the blade portion 79 so as to be movable in the circumferential direction of the shaft portion 77 of the rotating member 70 within a predetermined range, as in the first and third embodiments. The flow of the viscous fluid F between the radial tip of 79 and the inner peripheral surface of the casing 1 is controlled.

  18 and 19 show a state in which the valve member 80 is assembled to the blade portion 79 in the wrong assembly direction. In this state, the valve member 80 is assembled so that the narrow longitudinal end portion of the groove 88 is positioned on the wide circumferential convex portions 795 and 795 ′ of the blade portion 79. As shown in FIG. 19, the valve member 80 is on the convex portions 795 and 795 ′, and the valve member 80 cannot be housed in the casing 1 together with the rotating member 70 in this state.

  FIGS. 20-24 shows the rotary damper which concerns on the 1st modification of Example 1 of this invention as Example 5. FIG. The same reference numerals are used for the same members as those of the rotary damper according to the first embodiment.

  The first modification of the first embodiment, which is the fifth embodiment, relates to the blade portion 9 of the rotating member 10 of the first embodiment. As described in the first embodiment, the blade portion 9 has the radial tip 92a of the one end portion 92 (right side in the drawing) and the other end portion 93 (left side in the drawing) in the radial direction. It is divided into a tip 93a. In the first modified example, a convex portion 95 ′ projecting radially outward of the shaft portion 7 is formed on the radial tip 93 a of the other end portion 93 so as to be biased toward one side in the width direction, in the illustrated example. The second embodiment is different from the first embodiment in that it is not formed over the entire width of the radial tip 93a at the other end. However, the arrangement of the convex portion 95 ′ is changed to have an asymmetric shape with respect to the line segment hh that bisects the axial length L as the tip shape of the blade portion 9. There is no.

  In the illustrated example, the convex portion 95 ′ is provided substantially at the center in the longitudinal direction at the radial tip 93 a of the other end portion 93, but it may be deviated in any one of the longitudinal directions. In short, the blade portion 9 is formed by differentiating the shape of the one end portion and the other end portion in the axial direction so as to have an asymmetric shape with respect to the line segment hh that bisects the axial length L. It only has to be.

  The valve member 20 of the first modification is formed substantially the same as the valve member 20 of the first embodiment. About the point to which the flow of the viscous fluid F in the fluid passage P between the radial direction front-end | tip of the blade | wing part 9 and the internal peripheral surface 1c of the casing 1 is controlled by the movement to the circumferential direction of the axial part 7 of the valve member 20 is controlled. Since this is the same as the fluid control of the first embodiment, detailed description thereof will be omitted.

  23 and 24 show a state in which the valve member 20 is assembled to the blade portion 9 in the wrong assembly direction. In this state, the valve member 20 is assembled so that the longitudinal end portion without the hole 8 is positioned on the convex portion 95 ′ of the other axial end portion 93 of the blade portion 9. Is on the convex portion 95 ′, and the valve member 20 cannot be housed in the casing 1 together with the rotating member 10 in this state.

  25 to 29 show a rotary damper according to a second modification of the first embodiment of the present invention as a sixth embodiment. The same reference numerals are used for the same members as those of the rotary damper according to the first embodiment.

  The second modification of the first embodiment which is the sixth embodiment also relates to the blade portion 9 of the rotating member 10 of the first embodiment. Unlike the first embodiment, the blade portion 109 of the rotating member 110 according to the second modified example includes extending portions 197 and 199 that extend in the radial direction of the shaft member 107 up to positions that contact the inner peripheral surface 1c of the casing 1 at both ends in the axial direction. The extending portions 197 and 199 at both ends in the axial direction are not covered by the valve member 20 and are in direct contact with the inner peripheral surface 1c of the casing 1 without the valve member 20 interposed therebetween. As shown in FIG. 26, these extended portions 197 and 199 have a fan-like shape in which the cross-sectional shape extends toward the tip 197a.

  The portions inside the extending portions 197 and 199 at both ends in the axial direction of the blade portion 109 are formed in the same manner as in the first embodiment. That is, the radial front end portion of the blade portion 109 is divided into an axial end portion 192 (right side in the drawing) and the other end portion 193 (left side in the drawing) by a central recess 191. A convex portion 195 protruding outward in the radial direction of the shaft portion 107 is formed on the radial tip 193a of the other end 193 over the entire width of the radial tip 193a of the other end. The arrangement of the projections 195 is also different in that the shape of the tip of the blade portion 109 in the radial direction is asymmetric with respect to the line segment hh that bisects the axial length L. Absent.

  The valve member 20 of the second modified example is formed substantially the same as the valve member 20 of the first embodiment. This is because the blade portion 109 has the same shape as the blade portion 9 of the first embodiment except for the portions where the extending portions 197 and 199 at both ends in the axial direction are provided. Therefore, the valve member 20 is attached so as to cover the inner portions of the extending portions 197 and 199 at both ends in the axial direction of the blade portion 109. When the shaft portion 107 rotates relative to the casing 1, the valve member 20 moves in the circumferential direction of the shaft portion 107 as described in the first embodiment, and the radial tip of the blade portion 9 and the inside of the casing 1 are moved. The valve member 20 moves and controls the flow of the viscous fluid F in the fluid passage P between itself and the peripheral surface 1c.

  29 and 30 show a state in which the valve member 20 is assembled to the blade portion 109 in the wrong assembly direction. In this state, the valve member 20 is assembled so that the longitudinal end portion without the hole 8 is positioned on the convex portion 195 of the other axial end portion 193 of the blade portion 109. The valve member 20 cannot be stored in the casing 1 together with the rotating member 110 in this state.

DESCRIPTION OF SYMBOLS 1 ... Casing 2,62,82 ... Top wall of valve member 3 ... Connection part with other apparatus of rotating member 4a / 4b, 64a / 64b, 84a / 84b ... Drooping wall of valve member 6,46,66,86 ... Recessed part of valve member 7, 37, 57, 77, 107 ... Shaft part of rotating member 8, 48 ... Hole of valve member 68, 88 ... Groove of valve member 9, 39, 59, 79, 109 ... Blade of rotating member Part 10, 30, 50, 70, 110 ... Rotating member 20, 40, 60, 80 ... Valve member 91, 191, 391, 591, 791 ... Blade part 92, 192, 392, 592, 792 ... Longitudinal direction of the blade part One end 93, 193, 393, 593, 793 ... The other end in the longitudinal direction of the blade 95, 95 ', 195, 395 ... The radial projection of the blade 595/595', 795/795 '... Both of the blade Circumferential convex

Claims (3)

A convex wall comprising a casing filled with a viscous fluid and a rotating member partially inserted into the casing, the casing being provided along the axial direction on the inner peripheral surface and projecting radially inward The rotating member has a blade portion provided along the axial direction on the outer peripheral surface of the shaft portion inserted into the casing and projecting radially outward, and a valve is provided at the tip of the blade portion. The blade portion is mounted so that the valve member increases the braking torque when the shaft portion rotates relative to the casing in one direction and decreases the braking torque when the shaft portion rotates relative to the other direction. In the rotary damper in which the flow of the viscous fluid is controlled in the fluid passage between the tip of the casing and the inner peripheral surface of the casing,
The valve member is provided at the tip of the blade part so as to be movable relative to the blade part in a predetermined range in the circumferential direction of the shaft part,
Forming the blade portion to have an asymmetric shape with respect to a line segment that bisects the axial length;
Only when the valve member is assembled to the blade portion in a normal assembly direction, the blade member receives the tip of the blade portion and the blade portion in the predetermined range in the circumferential direction of the shaft portion. A rotary damper having a shape that allows relative movement with respect to the rotary damper.   The configuration in which the blade portion is formed so as to have an asymmetric shape with respect to a line segment that bisects the length in the axial direction is such that the concavo-convex shape in the radial direction of the shaft portion is The rotary damper according to claim 1, wherein the length is divided into two equal parts on one side and the other side. The configuration in which the blade portion is formed to have an asymmetric shape with respect to a line segment that bisects the axial length is the circumferential direction of the shaft portion provided symmetrically in the left-right width direction of the blade portion. 3. The configuration in which the concavo-convex shape is different on one side and the other side with respect to a line segment that bisects the axial length of the blade portion. Rotating damper as described in

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