JP2006242253A - Rotating damper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a structure, in relation to a rotating damper. <P>SOLUTION: This rotating damper device is characteristically provided with: a case 1 having a damper chamber 11 filled with a fluid; a rotary shaft 3 relatively rotatably mounted to the case 1 and having a small-diameter part 43 inserted and arranged in the damper chamber 11; a vane 9 rotatively engaged with the rotary shaft 3, used for partitioning the damper chamber 11 into a pressure chamber 65 and a non-pressure chamber 67, and rotatively movable toward the pressure chamber 65 or the non-pressure chamber 67 in response to the rotation of the rotary shaft 3; a fluid passage 7 formed in the vane 9 for communicating the pressure chamber 65 with the non-pressure chamber 67; and a valve element 5 having bent parts at both its ends fitted and supported to the vane 9 with elastic force and an intermediate part displaced toward the pressure chamber 65 against energization force to open the fluid passage 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotary damper device for damping a closing operation of a piano keyboard lid, a toilet lid and the like.

  A conventional rotary damper device of this type applies a damping force to a lid, a door or the like when it is opened or closed. In this conventional rotary damper device, there is play until the valve body shuts off the fluid passage. Therefore, when the rotating member is rotated in the closing direction, the valve body moves in the play section. For this reason, it took a certain amount of time to reach a state in which the damper action is exhibited, and there was a range in which the damping action did not work. The range or period during which this damping action does not work is called “backlash”.

  For this reason, for example, when the keyboard cover of the piano is slightly opened and then released, the keyboard cover may be rapidly closed due to the backlash.

  On the other hand, there is one in which a spring is attached to the valve body or a spring is integrally provided on the valve body so that the fluid passage is immediately closed by the urging force of the spring and the damping action is immediately activated.

  However, there are problems such as complicated structure and complicated assembly.

JP 2000-199536 A JP 2002-364893 A JP 2003-176845 A Japanese Patent No. 2894596

  The problem to be solved is that the structure is complicated and the assembly is complicated.

  In order to simplify the structure of the present invention, both ends of the movable body are fitted and supported with elasticity, and the intermediate portion is displaced against the biasing force toward the first chamber side or the second chamber side to open the fluid passage. The main feature is the provision of a valve body.

  The rotary damper device according to the present invention includes a valve body that is fitted and supported by a movable body with elastic force at both ends and an intermediate portion is displaced against the urging force toward the first chamber side or the second chamber side to open the fluid passage. Since it is provided, the valve body and its support can be made simple, the structure is simple as a whole, and the assembly can be facilitated.

  The purpose of simplifying the structure was realized by improving the valve body and support structure.

[Structure of rotating damper device]
1 to 5 show a rotary damper device according to an embodiment of the present invention, FIG. 1 is a cross-sectional view as viewed from the pressure chamber side, FIG. 2 is a cross-sectional view taken along the arrow SA-SA in FIG. FIG. 4 is an enlarged view of a main part viewed from the pressure chamber side, and FIG. 5 is an end view of the vane.

  As shown in FIGS. 1 to 4, the rotary damper device 1 includes a case 1, a rotary shaft 3, a vane 5, a fluid passage 7, and a valve body 9, and is filled with a viscous fluid such as silicon oil. .

  The case 1 is attached to a piano body or a toilet body, and is formed by, for example, zinc die casting or the like, and includes a damper chamber 11 on the back side and a rotation support portion 13 on the opening side. The damper chamber 11 is formed in a fan shape in cross section as shown in FIG. 2 and includes an arcuate rotation receiving portion 15. The rotation support portion 13 has an inner circumference that is circular in cross section. A female screw part 19 is provided on the inner periphery of the opening 17 of the case 1, and a lock nut 21 is fastened. A bracket part 23 for fastening and fixing is provided on the outer periphery of the opening 17. The bracket portion 23 is provided with a through hole 25 for fastening the fastener. The back wall 27 of the case 1 is provided with an injection hole 29 formed by a female screw. A fitting projection 31 having a circular cross section through which the injection hole 29 passes is provided on the inner surface of the inner wall 27, and a recess 33 is provided on the outer surface. A male screw member 35 is fastened to the injection hole 29, and a head portion 37 of the male screw member 35 is tightened into the recess 33. An O-ring 39 for sealing is interposed between the head 37 and the back wall 27. The male screw member 35 is screwed into the injection hole 29 after the viscous fluid is injected into the damper chamber 11 from the injection hole 29.

  The rotating shaft 3 is rotatably attached to the case 1 and is formed in a stepped shape including a large-diameter portion 41, a small-diameter portion 43, and a connecting portion 45 by zinc die casting or the like.

  The large-diameter portion 41 is rotatably supported by the rotation support portion 13 and includes recesses 47 and 49 on the outer periphery. The recesses 47 and 49 accommodate sealing O-rings 51 and 53, which are in close contact with the inner peripheral surface 54 of the rotation support portion 13 and are slidable. The large diameter portion 41 is provided with a stepped portion 55, and a bush 57 is interposed between the stepped portion 55 and the lock nut 21.

  The small diameter portion 43 is inserted and disposed in the damper chamber 11. The small-diameter portion 43 is provided with an engaging protrusion 59 on the outer peripheral portion side along the axial direction, and a circulation recess 61 is formed in the engaging protrusion 59. The cross section of the engaging protrusion 59 has a shape in which one side is inclined and the tip is gradually narrowed. A fitting recess 62 is provided on the end surface of the small diameter portion 43, and the fitting recess 62 is fitted to the fitting protrusion 31 via a bush 63.

  The connecting portion 45 protrudes outside the case 1 and is interlocked and connected to an opening / closing body such as a keyboard cover of a piano or a lid of a toilet.

  The vane 5 is made of resin or the like. The vane 5 is rotationally engaged with the rotary shaft 3 to partition the damper chamber 11 into a pressure chamber 65 which is a first chamber and a non-pressure chamber 67 which is a second chamber, and a pressure chamber according to the rotation of the rotary shaft 3. It is possible to swivel toward the 65 side or the non-pressure chamber 67 side.

  The vane 5 is formed in a rectangular shape as a whole and has a length equivalent to the axial length of the damper chamber 11. An arcuate slidable contact surface 69 is formed on the outer periphery of the vane 5 so as to be in close contact with the inner peripheral surface 71 of the damper chamber 11 and slidable. One end surface 73 of the vane 5 is in contact with the large diameter portion 41 of the rotating shaft 3, and the other end surface 75 is in close contact with the inner end surface 77 of the damper chamber 11 and is slidable.

  An engagement recess 79 is provided in the vane 5. The engagement recess 79 is formed in a cross-sectional shape corresponding to the cross-sectional shape of the engagement protrusion 79, and the engagement protrusion 59 is fitted and engaged with the engagement recess 79.

  The fluid passage 7 is provided in the vane 5 and communicates the pressure chamber 65 and the non-pressure chamber 67. The fluid passage 7 includes an engagement recess 79, a recess-like passage 83 formed on both sides of the fluid passage 7, an elongated hole-like passage 85, a valve element arrangement space 87 formed adjacent to the passage 85, and a valve element arrangement space 87. It consists of an open passage 89 formed adjacent to it. The passage 83 communicates with the non-pressure chamber 67 side, and the passage 89 communicates with the pressure chamber 65 side. Both ends of the valve element arrangement space 87 are fitting portions 91 and 93 for fitting support. As shown in FIG. 5, a valve body mounting hole 94 formed in one end surface 73 of the vane 5 communicates with the valve body arrangement space 87.

The valve body 9 is formed of a rectangular SUS leaf spring material, and is provided with curved portions 95 and 97 that are folded back at both ends. The valve body 9 has curved portions 95 and 97 at both ends fitted into the fitting portions 91 and 93 of the valve body arrangement space 87, and the curved portions 95 and 97 are fitted to the fitting portions 91 and 93 and the curved portion 95. , 97 are supported with an elastic force. The valve element 9 is in close contact with the vane 5 in the valve element arrangement space 87 and is closed so that the intermediate portion 99 covers the passage 85.
[Assembly of valve body, etc.]
FIG. 6 is an explanatory view showing assembly of the valve body. As shown in FIG. 6, the valve body 9 is inserted as shown by an arrow from the valve body mounting hole 94 of the one end surface 73 of the vane 5 and attached to the valve body arrangement space 87. In this state, the curved portions 95 and 97 are fitted into the fitting portions 91 and 93, and the intermediate portion 99 is in contact with the vane 5 to close the passage 85.

  Thus, since the curved portions 95 and 97 of the valve body 9 are fitted and supported with elasticity against the fitting portions 91 and 93, the valve body 9 can be reliably supported by the vane 5, The valve body 9 can be attached to the vane 5 very easily.

When the engagement projection 59 of the small diameter portion 43 is fitted and engaged with the engagement recess 79 of the vane 5, the engagement projection 59 has a tapered shape, and the engagement recess 79 has a mouth-opening shape. Therefore, the fitting engagement can be performed very easily.
[Damping action of rotating damper device]
7 is a cross-sectional view of the main part in the normal state as viewed in the direction of the arrow SB-SB in FIG. 2, FIG. 8 is a cross-sectional view of the main part in the direction of the opening in the direction of the arrow SB-SB in FIG. It is principal part sectional drawing at the time of the closed displacement in SB-SB arrow view.

  In a normal state in which the opening / closing body such as a piano keyboard lid and a toilet lid is not opened / closed, the intermediate portion 99 of the valve body 9 contacts the vane 5 and closes the passage 85 as shown in FIG.

  When opening the opening / closing body, the rotary shaft 3 rotates in the direction of arrow A in FIG. In this rotation, the engagement concave portion 79 of the vane 5 receives a force through the engagement protrusion 59 of the small diameter portion 43 and the vane 5 rotates and moves in the same direction as the rotation shaft 3.

  With this rotational movement, the vane 5 moves toward the non-pressure chamber 67 along the inner surface of the damper chamber 11, and the viscous fluid on the non-pressure chamber 67 side is transferred to the passage 83 of the fluid passage 7 by reducing the volume on the non-pressure chamber 67 side. Moves relatively through the flow recess 61 and the passage 85. By this fluid movement, the pressure of the viscous fluid acts on the valve body 9 as shown in FIG. 8, and the intermediate portion 99 of the valve body 9 resists its own elastic force in the valve body arrangement space 87, that is, on the passage 89 side. The fluid passage 7 is opened by being curved and displaced toward the pressure chamber 65 side.

  When the valve body 9 is displaced, the position of the valve body 9 abuts on the side of the passage 89 in the valve body arrangement space 87 and the position of the valve body 9 is regulated, so that the displacement amount of the valve body 9 can be stabilized.

  Due to the displacement of the valve body 9, the viscous fluid passes from the passage 85 to both sides in the width direction of the valve body 9 (both sides in the vertical direction in FIG. 4) and flows from the passage 89 to the pressure chamber 65 side. The fluid can be circulated from the 67 side to the pressure chamber 65 side.

  Therefore, the rotating shaft 3 is in an idling state, and the opening / closing body can be opened without difficulty.

  When the opening operation of the opening / closing body is stopped, the displacement of the intermediate portion 99 returns due to the elastic return force of the valve body 9, and the passage 85 is instantaneously closed as shown in FIG.

  Next, when the opening / closing body is closed, the rotary shaft 3 rotates in the direction of the pressure chamber 65 (in the direction of arrow B in FIG. 2) in conjunction with this, and the vane 5 rotates in the same direction.

  By this rotational movement, the vane 5 moves to the pressure chamber 65 side along the inner surface of the damper chamber 11, the internal pressure on the pressure chamber 65 side rises, and acts on the valve body 9 as shown in FIG. The valve element 9 is brought into close contact with the vane 5 by the action of the pressure, and the fluid passage 7 is closed by closing the passage 85.

  Therefore, the damping action works by the fluid pressure, and the opening / closing body can be closed gently.

  In this case, when the opening / closing body is opened and then stopped, the passage 85 is instantaneously closed by the elastic restoring force of the valve body 9 as described above. Since it starts, “backlash”, which is a range or period in which the damping action does not work, is suppressed, and the opening / closing body can be reliably closed quietly.

  As described above, the bent portions 95 and 97 at both ends of the valve body 9 are fitted and supported by the fitting portions 91 and 93 of the vane 5 with elastic force, and the intermediate portion 99 resists its urging force toward the pressure chamber 65 side. Since it displaces and the fluid passage 7 is opened, the valve body 9 and its support can be made a simple structure, the structure is simple as a whole, and the assembly can be facilitated.

Since the valve body 9 is formed of a SUS leaf spring material, the structure of the valve body 9 itself can be simplified, and the curved portions 95 and 97 at both ends of the valve body 9 are connected to the fitting portions 91 and 93 of the vane 5. From this point, the structure can be simplified and the assembly can be easily performed.
[Others]
Although the said valve body 9 was formed with the leaf | plate spring material, it can also be set as the structure which forms a valve body with a rigid plate and attaches a spring material to both ends.

  A slit having an equal length communicating with the valve element arrangement space 87 may be formed in the vane 5, and the valve element 9 may be assembled by parallel movement from the slit.

It is sectional drawing seen from the pressure chamber side of the rotation damper apparatus (Example 1). (Example 1) which is SA-SA arrow sectional drawing of FIG. (Example 1) which is sectional drawing seen from the non-pressure chamber side of the rotation damper apparatus. (Example 1) which is the principal part enlarged view seen from the pressure chamber side of the rotation damper apparatus. It is an end view of a vane (Example 1). It is explanatory drawing which shows the assembly | attachment of a valve body (Example 1). (Example 1) which is principal part sectional drawing at the time of the normal state in the SB-SB arrow view of FIG. (Example 1) which is principal part sectional drawing at the time of the open displacement in the SB-SB arrow view of FIG. (Example 1) which is principal part sectional drawing at the time of the closed displacement in the SB-SB arrow view of FIG.

Explanation of symbols

1 Case 3 Rotating shaft (Rotating member)
5 Vane (movable body)
7 Fluid passage 9 Valve body 11 Damper chamber 65 Pressure chamber (first chamber)
67 Non-pressure chamber (second chamber)
91,93 Fitting part 95,97 Bent part (both ends)
99 Middle part

Claims (2)

A case having a damper chamber filled with fluid;
A rotating member that is attached to the case so as to be relatively rotatable, and is inserted into the damper chamber;
A movable body that is rotationally engaged with the rotating member, divides the damper chamber into a first chamber and a second chamber, and is movable to the first chamber side or the second chamber side according to the rotation of the rotating member;
A fluid passage provided in the movable body for communicating the first chamber and the second chamber;
The movable body includes a valve body that is fitted and supported with elastic force at both ends and the intermediate portion is displaced against the biasing force toward the first chamber side or the second chamber side to open the fluid passage. Rotating damper device characterized. The rotary damper device according to claim 1,
The valve body is formed of a leaf spring material,
At both ends of the valve body, a bent portion formed by folding is provided,
The rotary damper device, wherein the movable body is provided with a fitting portion that fits and supports the bending portion.

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