JP4829656B2 - Rotating damper - Google Patents

Description

  The present invention relates to a rotary damper that includes a biasing means that is configured such that the other member is rotatable with respect to the one member and relatively applies a rotational force to both the one member and the other member.

As a rotary damper provided with an urging means in which the other member is pivotably combined with the one member and relatively applies a rotational force to both the one member and the other member, for example, disclosed in Patent Document 1 below Is disclosed.
JP 2006-515 A

  In Patent Document 1, when the other member is rotated and opened with respect to one member, the automatic rotation of the other member by the urging means is temporarily stopped before reaching the rotation end position. Between the stop position and the rotation end position, the intermediate part 3 is temporarily fixed by pressing the elastic protrusion 204 against the inner wall of the narrow diameter portion 307 of the sub-cylinder portion 300 at any rotation position of the intermediate part 3. (Refer to FIG. 12 of Patent Document 1), so that the other member can be automatically rotated until the middle of rotation, and the rotation area ahead is set as a free stop area, and any rotation can be performed. The point which enabled it to hold | maintain the attitude | position of the other member in a position is disclosed.

  However, in this prior art, the spring force by the spring as the urging means acts also in the free stop region, so that the posture can be maintained at an arbitrary rotation position, but the user's operation according to the rotation angle. A slight difference occurs in the feeling, and the operability is not always good.

  Further, since the spring force due to the spring acts also in the free stop region, adjustment of the pressure contact force to the inner wall of the narrow diameter portion 307 of the sub-cylinder portion 300 of the elastic protrusion 204 is necessary according to the spring force. It is difficult to manage the state, and if the adjustment cannot be performed properly, the spring force is too strong and may move.

  The present invention has been proposed in view of the above, and can improve the operability by eliminating the difference in operating feeling felt by the user in the free stop region, and easily manage the pressure contact state in the free stop region. An object of the present invention is to provide a rotary damper that can be used.

  The present invention is as follows.

(1) In a rotary damper that includes a biasing means that is configured such that the other member is rotatable with respect to the one member and relatively applies a rotational force to both the one member and the other member, the other member is the one member. biasing force of the biasing means together with the frictionally engaging is perforated in a part of the pivoting region of the first pivoting region does not act as. That is, in a rotary damper including a coil spring that is combined with a rotor so as to be rotatable with respect to the rotor and applies a rotational force to both the rotor and the housing, the housing has a circular bottom portion and a cylinder at the bottom outer edge. And having a wide-diameter region with an enlarged inner peripheral diameter and a narrow-diameter region with a narrowed inner diameter on the inner peripheral surface of the cylindrical wall portion, and the rotor includes a circular flange portion and a flange portion Two claw portions provided opposite to each other on one surface of the flange portion and a convex portion provided on the outer periphery of the flange portion, and the rotor is rotatably supported at the center of the bottom portion of the housing. The coil spring has a linear bent portion at one end thereof inserted between the two claws of the rotor, and the other end is fixed to the housing. In addition, the convex portion of the rotor is frictionally engaged by being located in the narrow-diameter region of the housing, and the bent portion of the coil spring is free from any of the two claw portions, and the urging force does not act to provide a free stop action. It has the 1st rotation area in a part of rotation area.

(2) In the rotary damper of (1), the other member rotates in a second rotation region where the degree of frictional engagement with the one member is weak or zero and the urging force of the urging means acts. It has been closed to the part of the dynamic region. That is, in the rotary damper of (1), the convex portion of the rotor is located in the wide-diameter region of the housing, so that the frictional engagement does not occur, and the bent portion of the coil spring is pressed against the claw portion and the urging force acts. It has 2 rotation area | regions in a part of rotation area | region, It is characterized by the above-mentioned.

  In the present invention, the first member is provided with a first rotation region in which the other member is frictionally engaged with the one member and the urging force of the urging means does not act on the rotation region of the other member. In the top area, there is no difference in the feeling of operation felt by the user according to the rotation angle, and the operability is improved because it becomes uniform, and it is not necessary to adjust the urging force. It is possible to easily manage the pressure contact state.

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

  FIG. 1 is an exploded perspective view showing an embodiment of the rotary damper of the present invention, in which (a) is from one direction and (b) is from a different direction from (a). In FIG. 1, the rotary damper 1 includes a housing 2, an O-ring 3, a rotor 4, a coil spring 5, and a shaft 6, and the housing 2 is combined with the rotor 4 so as to be rotatable. Reference numeral 5 relatively applies a rotational force to both the rotor 4 and the housing 2. Hereinafter, each component will be described in detail.

  2A and 2B are views showing the housing, in which FIG. 2A is a plan view and FIG. 2B is a cross-sectional view taken along line AA in FIG. The housing 2 is made of a synthetic resin having rigidity. As shown in FIGS. 1 and 2, the bottom portion 21 having a circular planar shape, a cylindrical wall portion 22 provided around the outer edge of the bottom portion 21, and the bottom portion 21. A substantially columnar shaft support portion 23 provided at the center of the bottom surface 21a of the base plate 21 and an arm portion 24 provided radially on the outer periphery of the cylindrical wall portion 22. The upper inner peripheral surface 22a of the cylindrical wall portion 22 is formed with a wide-diameter region R1 having an enlarged inner peripheral diameter and a narrow-diameter region R2 having a diameter slightly smaller than the inner diameter of the wide-diameter region R1. The step surfaces 221 and 222 between the diameter region R1 and the narrow diameter region R2 are provided with a gradient. In addition, the arm portion 24 is formed with an elongated recess 24a.

  3A and 3B are views showing the rotor, in which FIG. 3A is a plan view and FIG. 3B is a cross-sectional view taken along line BB in FIG. The rotor 4 is made of a synthetic resin having rigidity. As shown in FIGS. 1 and 3, the rotor portion 4 has a circular flange portion 41 and a shaft portion 42 provided at the center of one surface 41 a of the flange portion 41. , Two claw portions 43a and 43b that are spaced from and opposed to each other on the other surface 41b of the flange portion 41, and a convex portion 44 that is provided on the outer periphery of the flange portion 41.

  Inflated portions 430a and 430b are formed on the surface 41a at the bases of the claw portions 43a and 43b.

  In addition, a cylindrical recess 42a is provided at the center of the end face of the shaft portion 42 so that the shaft support portion 23 of the housing 2 can be rotated (rotated). Furthermore, an accommodation groove 42 b that accommodates the O-ring 3 is provided around the outer peripheral surface of the shaft portion 42.

  The O-ring 3 is formed of, for example, self-lubricating silicone rubber and is installed in the accommodation groove 42 b of the rotor 4.

  As shown in FIG. 1, one end of the coil spring 5 is linearly formed and bent, and the linear bent portion 51 is located at a substantially circular center when the coil spring 5 is viewed in plan view. It is like that. The other end side is linearly extended in a substantially tangential direction with respect to the circular coil spring 5 in plan view, and then bent at a substantially right angle in the direction of one end side of the coil spring 5 and further bent at a substantially right angle. The tip straight portion 52 is formed so as to face outward with respect to the coil spring 5. At the time of assembly, the bent portion 51 on one end side is loosely fitted between the claw portions 43 a and 43 b of the rotor 4, and the front end straight portion 52 on the other end side is fixed to the elongated recess 24 a of the housing 2.

  As shown in FIG. 1, the shaft 6 includes a substantially cylindrical bottom portion 61 and a columnar portion 62 provided at the center of the end surface of the bottom portion 61. In the bottom portion 61, notches 611 and 611 are formed at symmetrical positions so as to engage with the claw portions 43 a and 43 b of the rotor 4.

  The procedure for assembling each of the above components will be described with reference to FIGS.

  First, a predetermined amount of silicone oil S is injected into the inside of the cylindrical wall portion 22 of the housing 2, the O-ring 3 is installed in the receiving groove 42 b of the rotor 4, and the recess 42 a of the rotor 4 is press-fitted into the shaft support portion 23 of the housing 2. To do. Thereby, the silicone oil S is sealed between the bottom 21 of the housing 2 and the O-ring (see FIG. 4). When the rotor 4 is fixed and the housing 2 is rotated, the inner peripheral surface of the cylindrical wall portion 22 slides on the O-ring 3, and the housing 2 rotates (rotates) around the rotor portion 4 around the shaft support portion 23. ) Is possible.

  Further, the convex portion 44 of the rotor 4 is opposed to the upper inner peripheral surface 22a of the cylindrical wall portion 22 of the housing 2, and when the upper inner peripheral surface 22a corresponds to the narrow diameter region R2, the convex portion 44, The convex portion 44 and the narrow-diameter region R2 are in contact with the upper inner peripheral surface 22a of the narrow-diameter region R2 (hereinafter simply referred to as “narrow-diameter region R2”) when the housing 2 rotates with respect to the rotor 4. Are frictionally engaged. On the other hand, when the upper inner peripheral surface 22a corresponds to the wide diameter region R1, the convex portion 44 and the upper inner peripheral surface 22a of the wide diameter region R1 (hereinafter simply referred to as “wide diameter region R1”) are in a pressure contact state. The degree is weak or zero, and the degree of frictional engagement when the housing 2 rotates with respect to the rotor 4 is also weak or zero.

  Next, the bent portion 51 of the coil spring 5 is put between the claw portions 43 a and 43 b of the rotor 4, the tip straight portion 52 is put into the concave portion 24 a of the housing 2, and the coil spring 5 is set on the end surface of the rotor 4. (See FIG. 4).

  Subsequently, the notches 611 and 611 of the shaft 6 are press-fitted into the claw portions 43a and 43b of the rotor 4, and the bottom surface 61a of the shaft 6 is brought into contact with the expanded portions 430a and 430b of the claw portions 43a and 43b. And the rotor 4 are integrated (see FIG. 5). As a result, a space corresponding to the height of the bulging portions 430a and 430b is secured between the bottom surface 61a of the shaft 6 and the other surface 41b of the rotor 4, and the bent portion 51 of the coil spring 5 is accommodated in this space. Is done. The coil spring 5 does not fall out of the shaft 6 and the like due to the press-fitting of the shaft 6, and the bent portion 51 of the coil spring 5 is a rotor according to the rotation of the housing 2 as will be described in detail later. 4 is moved back and forth between the claw portions 43a and 43b on the other surface 41b of the coil 4, and the coil spring 5 has its bent portion 51 pressed against the claw portions 43a and 43b to exert a biasing force (FIG. 6). (Refer to (a) and (b)), it is located between the claw portions 43a and 43b, and is free from any of the claw portions 43a and 43b, and the urging force does not act (see FIG. 7B).

  Further, the outer peripheral surface of the bottom portion 61 of the shaft 6 and the outer peripheral surfaces of the claw portions 43a and 43b of the rotor 4 are combined to form a substantially cylindrical body, and the coil spring 5 is loosely fitted to the substantially cylindrical body.

  Next, the operation of the rotary damper 1 having the above configuration will be described with reference to FIGS.

  6 and 7 are diagrams showing the operation of the rotary damper in stages. First, in FIG. 6A, the rotary damper 1 is held in the initial posture, and at this time, the bent portion 51 of the coil spring 5 is formed on the outer peripheral surfaces (hereinafter simply referred to as “the extended portions 430a and 430b” of the claw portions 43a and 43b). Are strongly pressed against the claw portions 43a, 43b "), and an urging force is generated in the direction of the arrow X in the figure. Further, the convex portion 44 of the rotor 4 is located in the wide diameter region R <b> 1 of the housing 2.

  By the way, although not shown here, the rotary damper 1 includes various products (for example, a cosmetic container, a LAN antenna, a mobile phone, and the like) that are configured such that a movable body (lid body) and a product main body are connected to each other via a hinge portion. Applied to the hinge part of the telephone). In this case, in the rotary damper 1, the shaft 6 is fixed to the product main body side, and the housing 2 is fixed to the movable body (lid body) side. The initial posture corresponds to a state before the movable body is opened, and the movable body is fixed to the product body by a predetermined lock mechanism.

  When the user presses a push button or the like to release the lock, the housing 2 (arm portion 24) is rotated by the urging force of the coil spring 5 and the movable body of the product is automatically opened accordingly. FIG. 6B shows a state of the rotary damper 1 during the automatic rotation. In this state, the bent portion 51 of the coil spring 5 is in pressure contact with the claw portions 43a and 43b, but the pressure contact force gradually decreases, and the urging force in the X direction also decreases accordingly. Further, the convex portion 44 of the rotor 4 is located in the wide diameter region R <b> 1 of the housing 2.

  Thereafter, the housing 2 of the rotary damper 1 continues to rotate automatically while weakening the momentum, and stops in the state of FIG. In this state, the bent portion 51 of the coil spring 5 makes a slight contact with the claw portions 43a and 43b or is separated from the claw portions 43a and 43b, and there is no pressure contact with the claw portions 43a and 43b. Not. The convex portion 44 of the rotor 4 is located on the step surface 221 at the boundary between the wide diameter region R1 and the narrow diameter region R2 of the housing 2.

  As described above, in the rotation region (second rotation region) from the initial posture (FIG. 6A) to the automatic rotation stop posture (FIG. 7A). The rotary damper 1 is rotated by the urging force of the coil spring 5, and the convex portion 44 of the rotor 4 is positioned in the wide diameter region R1 of the housing 2 so that the convex portion 44 and the wide diameter region R1 do not frictionally engage and rotate. Only the urging force in the X direction acts on the damper.

  After the rotary damper 1 stops automatic rotation, when the user pushes the movable body to open it further, the convex portion 44 of the rotor 4 passes through the step surface 221 as shown in FIG. The convex portion 44 and the narrow diameter region R2 are frictionally engaged with each other by being press-fitted into the narrow diameter region R2. Further, the bent portion 51 of the coil spring 5 is free from any of the two claw portions 43a and 43b, and the urging force does not act.

  When the user continues the rotating operation of the movable body, the movable body stops at a stopper (not shown), and the subsequent rotation cannot be performed. FIG. 7C shows the posture when the manual rotation is stopped. In this posture as well, the convex portion 44 and the narrow-diameter region R2 are frictionally engaged in the same manner as the posture of FIG. 7B. Further, the bent portion 51 of the coil spring 5 is in light contact with the claw portions 43a and 43b or is separated from the claw portions 43a and 43b, and no urging force is applied.

  As described above, the rotation of the rotary damper 1 from the manual rotation start (automatic rotation stop) posture (FIG. 7A) to the manual rotation stop posture (FIG. 7C). In the region (first rotation region), the urging force of the coil spring 5 does not act on the rotary damper 1, while the convex portion 44 of the rotor 4 and the narrow-diameter region R2 are frictionally engaged. Therefore, in this first rotation area, when the rotation operation is stopped, a free stop action that can be freely stopped in that position at that position is exhibited, and the first rotation area is a free stop area. It becomes.

  When the movable body is closed, the first rotation region is in the same free-stop state as when the movable body is opened. In the second rotation region, the bent portion 51 of the coil spring 5 presses the claw portions 43a and 43b, so that the urging force gradually increases, and the user closes the movable body against the urging force. Then, the product is locked and the closing operation is finished.

  As described above, in the present invention, in the free stop region, even if the movable body is rotated, no urging force is generated, so there is no difference in the operational feeling felt by the user according to the rotation angle, and the uniform. Therefore, the operability can be improved. In addition, since the urging force has conventionally been applied in the free stop region, it has been necessary to adjust the urging force. However, in the present invention, since the urging force does not act in the free stop region, the pressure contact state in the free stop region is managed. Can be easily performed.

It is a disassembled perspective view of the rotary damper of this invention, (a) is from one direction, (b) is a figure from a different direction from (a). It is a figure which shows a housing, (a) is the top view, (b) is sectional drawing by the AA line of (a). It is a figure which shows a rotor, (a) is the top view, (b) is sectional drawing by the BB line of (a). It is a longitudinal cross-sectional view of a rotary damper, and is a figure which shows the state which press-fits a shaft, after attaching a coil spring to a housing and a rotor. It is a front view of a rotation damper. It is a figure which shows the rotation state of a housing in steps. It is a figure which shows the rotation state of a housing in steps.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotation damper 2 Housing 21 Bottom part 21a Bottom surface 22 Cylindrical wall part 22a Upper inner peripheral surface of cylindrical wall part 23 Shaft support part 24 Arm part 24a Concave part 221 Step surface 222 of wide diameter area | region R1 and narrow diameter area | region R2 Step surface with narrow-diameter region R2 3 O-ring 4 Rotor 41 Flange portion 41a One surface of flange portion 41b The other surface of flange portion 42 Shaft portion 42a Depression 42b Housing groove 43a Claw portion 43b Claw portion 44 Projection portion 430a Claw portion 43a bulging portion 430b claw portion 43b bulging portion 5 coil spring 51 bent portion 52 tip straight portion 6 shaft 61 bottom portion 62 columnar portions 611, 611 notch portion R1 wide diameter region R2 narrow diameter region X direction of urging force

Claims (2)

Housing is rotatably coupled to the rotor, in a rotary damper comprising a coil spring for imparting a relative rotational force to both the rotor and the housing,
The housing includes a circular bottom portion and a cylindrical wall portion at the outer edge of the bottom portion, and has a wide-diameter region whose inner peripheral diameter is widened and a narrow-diameter region which is narrowed on the inner peripheral surface of the cylindrical wall portion. ,
The rotor has a circular flange portion, two claw portions provided facing each other on one surface of the flange portion, and a convex portion provided on the outer periphery of the flange portion,
The rotor is rotatably supported at the center of the bottom of the housing and is housed in the housing. The coil spring has a linear bent portion on one end side inserted between two claw portions of the rotor, and the other end. The side is fixed to the housing,
When the housing rotates relative to the rotor,
Since the convex portion of the rotor is located in the narrow-diameter region of the housing, it is frictionally engaged, and the bent portion of the coil spring is free from any of the two claw portions, and the biasing force does not act, and a free stop action is imparted . Having one rotation area as a part of the rotation area;
Rotating damper characterized by that. Since the convex portion of the rotor is located in the wide-diameter region of the housing, the second rotational region in which the urging force is applied by the bent portion of the coil spring being in pressure contact with the claw portion is formed in the rotational region. The rotary damper according to claim 1, which is partly provided.

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