JP4523737B2 - Damper device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor body, a stator body having a container shape in which a part of the rotor body is housed in a state in which the rotation shaft of the rotor body is projected from the shaft hole, and the interior of the stator body. And a viscous fluid that applies braking to the rotation or relative rotation of the rotor body, and one member is assembled to the rotating shaft of the rotor body, or the other member is assembled to the stator body. Or, in combination, it is used for applications such as applying braking to the rotation of the stator body rotated about the rotation axis as the other member moves and applying braking to the movement of the other member. The present invention relates to an improved damper device.
[0002]
[Prior art]
As a rotary damper, there is one disclosed in Japanese Patent No. 2884267 described in Japanese Patent Publication.
[0003]
[Problems to be solved by the invention]
However, in such a conventional rotary damper, no special consideration is given to the seal between the central hole of the cap that closes the recess of the housing through which the rotary shaft of the brake rotor passes and the rotary shaft. That is, in such a conventional rotary damper, an O-ring is fitted to the rotary shaft inside the rotary damper. The O-ring is enclosed inside the rotary damper with the entry of dust and the like from the outside. Although leakage of viscous fluid is prevented, no particular consideration is given to the entry of dust or the like into the sliding contact portion between the O-ring and the rotating shaft, and dust or the like enters the sliding contact portion. In this case, it is expected that the O-ring is damaged and the durability of the damper is lowered.
[0004]
For this reason, such a conventional rotary damper is used for braking of rotation in a part of an article where dust or water may constantly enter the damper, such as braking of a wheelbarrow or a baby stroller wheel. It was not always suitable.
[0005]
Therefore, the present invention provides a rotor body, a stator body having a container shape in which a part of the rotor body is housed in a state where the rotation shaft of the rotor body is protruded to the outside from the shaft hole, and the stator body In a damper device including a viscous fluid that is sealed inside and applies a viscous fluid that applies braking to the rotation or relative rotation of the rotor body, a shaft hole for projecting the rotation shaft enters dust, water, or the like into the stator body. The main purpose is to enable easy and appropriate sealing.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, the damper device has the following configurations (1) to (5).
(1) a rotor body;
(2) A stator body having a container shape in which a part of the rotor body is housed in a state where the rotation shaft of the rotor body is protruded to the outside from the shaft hole;
(3) a viscous fluid that is enclosed within the stator body and applies braking to the rotation or relative rotation of the rotor body;
(4) Rubber or rubber-made plastic that is fitted on the outer side of the rotating shaft of the rotor body protruding outside from the shaft hole of the stator body and covers the shaft hole outside the stator body. And a seal tube body,
(5) A circumferential step surface pressed against the inner peripheral surface of the seal tube body between the tube ends of the seal tube body with respect to the seal tube body fitted to the rotary shaft of the rotor body from the end of the rotary shaft Is formed.
[0007]
According to such a configuration, the seal tube body is caught on the circumferential step surface, so that the tube end covering the shaft hole on the outer surface side of the stator body is not pressed against the outer surface of the stator body more than necessary. As a result, the dust resistance and waterproofness of the shaft hole can be appropriately ensured without hindering the rotation or relative rotation of the rotor body by the seal tube.
[0008]
In addition, the circumferential step surface can reliably prevent entry of dust, water, and the like from the distal end side of the rotating shaft into the stator body through the rotating shaft and the seal tube body.
[0009]
In the invention according to claim 2, the tube end side of the damper device according to claim 1 directed toward the distal end side of the rotating shaft of the rotor body in the seal tube body moves toward the tube end. The seal tube body is characterized in that the inner diameter is narrowed.
[0010]
According to this configuration, the inner surface of the seal tube body can be firmly adhered to the rotating shaft on the end side of the rotating shaft.
[0011]
In the invention according to claim 3, as the tube end side of the damper device according to claim 1 or 2 directed toward the outer surface side of the stator body in the seal tube body moves toward the tube end. The seal tube body is configured to have a skirt shape that expands the inner and outer diameters.
[0012]
According to this configuration, the shaft hole can be reliably covered with the seal tube body. Further, the seal tube body can be easily fitted to the rotary shaft from the tube end side forming the skirt shape.
[0013]
In the invention according to claim 4, the tube end side of the damper device according to claim 3 which is directed to the distal end side of the rotating shaft of the rotor body in the seal tube body is formed on the rotating step. It is characterized by having a thickness that does not elastically expand beyond the thickness of the circumferential edge of the surface.
[0014]
According to such a configuration, it is possible to prevent the reverse fitting of the seal tube body with respect to the rotating shaft.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, typical embodiments of the present invention will be described with reference to FIGS.
[0016]
Here, FIG. 1 shows the damper device according to the embodiment as a perspective state, and FIG. 4 shows the state before the seal tube body 3 is fitted to the rotary shaft 10 as a perspective state. ing. 2 shows the damper device as seen from the protruding side of the rotating shaft 10, and FIG. 3 shows the state of a cross section. FIG. 5 shows a state before the seal tube body 3 is fitted as a cross section.
[0017]
6 to 8 show the rotor body 1 constituting the damper device, FIGS. 9 and 10 show the cap 23 constituting the stator body 2, and FIGS. 11 to 13 show the base constituting the stator body 2. 22 and FIG. 14 and FIG. 15 show the seal tube body 3, respectively.
[0018]
The damper device according to this embodiment includes a rotor body 1 and a container shape in which a part of the rotor body 1 is housed in a state where the rotating shaft 10 of the rotor body 1 is protruded from the shaft hole to the outside. A stator body 2 formed therein, and a viscous fluid 4 enclosed within the stator body 2 to apply braking to the rotation or relative rotation of the rotor body 1. One of the members is assembled or combined, and the other member is assembled to or combined with the stator body 2, and the stator is typically rotated about the rotation shaft 10 as the other member moves. A brake is applied to the rotation of the body 2 to apply a brake to the movement of the other member, or the robot is guided and rotated by the shaft hole as the one member moves. By applying a braking to the rotation of the motor body 1 and is used to apply braking to the movement of the contrast member.
[0019]
As the viscous fluid 4, it is typically planned to use grease oil or silicone oil.
[0020]
In this embodiment, the rotor body 1 includes (1) the rotating shaft 10 and (2) a wing body 11 that is housed in the stator body 2.
[0021]
In this embodiment, the wing body 11 is configured as a plate-like body having a long side and a short side.
[0022]
The rotating shaft 10 is integrally formed with the wing body 11 so as to protrude from a substantially central portion on one surface side of the wing body 11 in a direction substantially orthogonal to the one surface of the wing body 11.
[0023]
The wing body 11 is formed so that a pair of facing edges on the long side thereof are substantially parallel to each other. Further, the wing body 11 is formed so that the pair of facing edges 11a and 11a on the short side thereof are arcuate edges that are curved so that the center side of the wing body 11 is curved inside. ing.
[0024]
In addition, a substantially circular through hole 12 is formed on both sides of the wing body 11 with the rotary shaft 10 interposed therebetween, and the viscous fluid 4 is also contained in the through hole 12 inside the stator body 2. It is configured to enter.
[0025]
Further, in this embodiment, the rotary shaft 10 is configured to have a hollow cylindrical shape in which the protruding end (the end 10a of the rotary shaft 10) is closed, and the wing body 11 On the other surface side opposite to the one surface side on which the rotation shaft 10 is provided, an open portion 13 communicating with the internal space of the rotation shaft 10 is formed, and a support protrusion 22c of the stator body 2 described later is disposed on the support protrusion 22c. In this state, the stator body 2 and the rotor body 1 are combined in a state of being inserted into the internal space.
[0026]
On the other hand, in this embodiment, the stator body 2 is configured as a disk-like body provided with a shaft hole 20 through which the rotating shaft 10 of the rotor body 1 protrudes on one surface side. Further, a part of the rotor body 1, in this embodiment, the wing body 11 is generally configured to be rotatable therein. In other words, in this embodiment, the stator body 2 has a circular interior that is slightly larger in diameter than the dimension between the pair of edges 11a, 11a on the short side of the wing body 11 of the rotor body 1. It is configured to have a space 21, and is rotated or relative by the rotation or relative rotation of the rotor body 1 that is rotatably assembled to the stator body 2 with the rotating shaft 10 protruding from the shaft hole 20. A resistance is applied to the rotation or relative rotation of the wing body 11 that is rotated by the viscous fluid 4 enclosed in the internal space 21, and the rotation or relative rotation of the rotor body 1 is performed through this resistance. The brake is applied to the rotation.
[0027]
In this embodiment, the stator body 2 has a base 22 having a case shape with one surface opened, and a state in which a rotation gap of the wing body 11 in the rotor body 1 is formed with respect to the base 22. And a cap 23 having a circular plate shape attached so as to close the open portion 22a of the base 22.
[0028]
Specifically, the base 22 has a rising portion 22b having a circular shape, and the tip of the rising portion 22b is fixed to the peripheral portion of the cap 23 in a liquid-tight state by the cap 23. The opening 22a is closed. In the case where the base 22 and the cap 23 are configured as a plastic molded product, the fixing is performed by welding the rising portion 22b of the base 22 and the peripheral portion of the cap 23 by a technique such as high-frequency welding. Can be made.
[0029]
Further, the shaft hole 20 having a circular shape is formed in the center portion of the cap 23 so as to penetrate therethrough, and the support protrusion 22c having a cylindrical shape is formed in the center portion of the base 22.
[0030]
In this embodiment, the support protrusion 22 c of the base 22 is inserted into the internal space of the rotating shaft 10 of the rotor body 1, and the rotating shaft 10 of the rotor body 1 is inserted into the cap 23. By inserting the viscous fluid 4 between the base 22 and the cap 23 and inserting the viscous fluid 4 between the base 22 and the cap 23, the base 22 and the cap 23 are fixed as described above, thereby the rotor. The rotor body 1 and the stator body 2 are assembled so that braking by the viscous fluid 4 is applied to the rotation or relative rotation of the body 1.
[0031]
In this embodiment, an O-ring 24 for sealing a hole edge inside the stator body 2 in the shaft hole 20 of the cap 23 is fitted to the base of the rotating shaft 10 of the rotor body 1, The rotor body 1 and the stator body 2 are assembled together in a state where leakage of the viscous fluid 4 is prevented from the inside of the stator body 2 by the O-ring 24.
[0032]
Further, in this embodiment, the outer side of the stator body 2 is fitted on the outer side of the rotating shaft 10 of the rotor body 1 protruding outside from the shaft hole 20 of the stator body 2 as described above. The plastic seal tube body 3 having rubber or rubber-like elasticity covering the shaft hole 20 is provided, and the rotary shaft 10 of the rotor body 1 is fitted into the rotary shaft 10 from the end 10a. A circumferential step surface 10 c that is pressed against the inner peripheral surface of the seal tube body 3 is formed between the tube ends 30 and 30 of the seal tube body 3 with respect to the seal tube body 3.
[0033]
Specifically, in this embodiment, the portion of the rotating shaft 10 of the rotor body 1 that protrudes to the outside from the shaft hole 20 is substantially equal to or larger than the inner diameter of the shaft hole 20. A large-diameter portion 10d having a slightly smaller outer diameter, and a small-diameter portion 10e formed at a position from the protruding end of the rotating shaft 10 (the end 10a of the rotating shaft 10) to the large-diameter portion 10d. The large-diameter portion 10d and the small-diameter portion 10e are connected to the connecting portion of the large-diameter portion 10d and the small-diameter portion 10e toward the projecting end of the rotary shaft 10 with a difference in diameter between the two. The arranged circumferential step surface 10c is formed.
[0034]
On the other hand, the seal tube body 3 is provided with a stepped surface 31 having a circular shape directed toward the one tube end 30 a side between the tube ends 30, 30. The step surface 31 is formed so as to be a surface substantially orthogonal to the central axis of the seal tube body 3.
[0035]
The seal tube body 3 has first and second flat inner surface portions 32 and 33 that are substantially parallel to the central axis of the seal tube body 3 on both sides of the stepped surface 31, respectively. The inner diameter of the first flat inner surface portion 32 on the one tube end 30a side to which the stepped surface 31 is directed is made slightly larger than the large diameter portion 10d of the rotary shaft 10 and on the other tube end 30 side. The inner diameter of the second flat inner surface portion 33 is configured to be slightly smaller than the small diameter portion 10 e of the rotary shaft 10.
[0036]
As a result, in this embodiment, with respect to the rotating shaft 10 of the rotor body 1 protruding from the shaft hole 20 of the stator body 2, the one tube end 30 a from the end 10 a of the rotating shaft 10. The seal tube body 3 can be fitted from the side while the seal tube body 3 is elastically pushed and spread to a position where the step surface 31 of the seal tube body 3 is caught by the circumferential step surface 10c of the rotary shaft 10.
[0037]
Since the seal tube body 3 fitted in this way is hooked and supported by the circumferential step surface 10c, one tube end 30a covering the shaft hole 20 on the outer surface side of the stator body 2 in the seal tube body 3 is necessary. Thus, it is not pressed against the outer surface of the stator. Accordingly, the shaft hole 20 is appropriately sealed by one tube end 30a of the seal tube body 3 so that dust or water does not enter without disturbing the rotation or relative rotation of the rotor body 1. be able to.
[0038]
Further, by the circumferential step surface 10c, it is possible to reliably prevent entry of dust, water, and the like through the rotary shaft 10 and the seal tube body 3 from the end 10a side of the rotary shaft 10.
[0039]
Moreover, in this embodiment, the other tube end 30b side of the seal tube body 3 that is fitted as described above is directed to the other tube end 30b side toward the end 10a of the rotary shaft 10 of the rotor body 1. It is comprised so that the internal diameter of the said seal tube body 3 may be made narrow as it goes to.
[0040]
Specifically, in this embodiment, the inner diameter of the seal tube body 3 between the second flat inner surface portion 33 and the other tube end 30b is directed toward the other tube end 30b. (Hereinafter, the portion between the second flat inner surface portion 33 and the other tube end 30b is referred to as an inner constricted portion 34). In the state where the body 3 is fitted, the inner constricted portion 34 is elastically deformed until the inner surface of the inner constricted portion 34 is substantially flush with the second flat inner surface portion 33. (Figure 3)
[0041]
As a result, in this embodiment, the inner surface of the seal tube body 3 can be firmly adhered to the rotary shaft 10 on the end 10a side of the rotary shaft 10, and the rotary shaft 10 and the seal tube body 3 can be tightly adhered. It is possible to sufficiently prevent the entry of dust and water from between.
[0042]
Moreover, in this embodiment, the one tube end 30a side directed to the outer surface side of the stator body 2 in the seal tube body 3 moves toward the one tube end 30a, so that the seal tube body 3 It is configured to have a skirt shape that expands the inner and outer diameters.
[0043]
Specifically, in this embodiment, the inner and outer diameters of the seal tube body 3 between the first flat inner surface portion 32 and the one tube end 30a side become the one tube end 30a. The seal tube body is configured so as to gradually become wider as it goes (hereinafter, the portion up to the first flat inner surface portion 32 and one tube end 30a is referred to as a skirt portion 35). In the state where 3 is fitted, the end portion of the skirt portion 35 is pressed against the outer surface of the stator body 2 so as to elastically push and spread the skirt portion 35 outward, and thus spread. The outer surface portion of the stator body 2 that goes around the shaft hole 20 is covered by the skirt portion 35 in a circular manner. (Fig. 1, Fig. 3)
[0044]
As a result, in this embodiment, the shaft hole 20 can be reliably sealed by the seal tube body 3 by fitting the seal tube body 3 to the rotating shaft 10.
[0045]
Further, since the inner diameter of the seal tube body 3 is large on the skirt portion 35 side, the seal tube body 3 can be easily fitted to the rotary shaft 10 from the skirt portion 35 side.
[0046]
In this embodiment, the central portion of the seal tube body 3 is thickly formed by the circumferential protrusion 36 projecting to the outside of the seal tube body 3, and thus thick. The skirt portion 35 is provided integrally with the lower end of the configured portion via the first flat inner surface portion 32, and the first flat inner surface portion 32 and the stepped surface 31 are in contact with each other. The skirt portion 35 is easily elastically pushed and spread around the portion.
[0047]
In this embodiment, the other tube end 30 b side of the seal tube body 3 facing the terminal end 10 a of the rotating shaft 10 of the rotor body 1 is the circumferential step surface 10 c formed on the rotating shaft 10. The thickness of the circumferential edge portion (that is, the edge portion where the circumferential step surface 10c and the large diameter portion 10d contact each other) is not thickened elastically.
[0048]
As a result, in this embodiment, since the seal tube body 3 cannot be fitted to the rotary shaft 10 from the other tube end 30b side, the skirt portion 35 is attached to the shaft hole. Execution of an appropriate assembly of the seal tube body 3 with respect to the rotary shaft 10 in a state directed toward the 20 side can be ensured at all times.
[0049]
In this embodiment, the end 10a portion of the rotating shaft 10 is formed in a cross shape in a plan view, and the end 10a portion thus formed in a cross shape. The corresponding end of the end 10a is inserted into the connecting hole (not shown) of one member provided with a corresponding protrusion in the connecting hole. By inserting, the one member and the rotor body 1 can be connected.
[0050]
【The invention's effect】
According to the damper device of the present invention, the seal tube body fitted from the end of the rotating shaft of the rotor body prevents the shaft hole of the stator body from which the rotating shaft protrudes from entering the stator body. Can be sealed easily and appropriately.
[Brief description of the drawings]
FIG. 1 is a perspective view of a damper device. FIG. 2 is a plan view. FIG. 3 is a cross-sectional view. FIG. 4 is a perspective view showing a state before a seal tube body 3 is fitted. 6] Plan view of rotor body 1 [FIG. 7] Cross section view [FIG. 8] Bottom view [FIG. 9] Plan view of cap 23 [FIG. 10] Cross section view [FIG. 11] Plan view of base 22 [FIG. FIG. 13 is a bottom view. FIG. 14 is a sectional view of the seal tube body 3. FIG. 15 is a side view of the seal tube body 3 as viewed from the right side in FIG.
DESCRIPTION OF SYMBOLS 1 Rotor body 10 Rotating shaft 10a Terminal 10c Circumferential step surface 2 Stator body 20 Shaft hole 3 Seal tube body 30 Tube end 4 Viscous fluid

Claims (4)

A rotor body;
A stator body having a container shape in which a part of the rotor body is housed in a state in which the rotation shaft of the rotor body is protruded to the outside from the shaft hole;
A viscous fluid that is enclosed within the stator body and applies braking to the rotation or relative rotation of the rotor body;
A plastic seal tube having rubber or rubber-like elasticity that is fitted on the outer side of the rotating shaft of the rotor body protruding outside from the shaft hole of the stator body and covers the shaft hole on the outer side of the stator body. With the body,
A rotating step surface that is pressed against the inner peripheral surface of the seal tube body between the tube ends of the seal tube body is formed on the rotary shaft of the rotor body with respect to the seal tube body fitted from the end of the rotary shaft. The damper device is characterized by that. The tube end side directed toward the distal end side of the rotating shaft of the rotor body in the seal tube body is configured to narrow the inner diameter of the seal tube body toward the tube end. The damper device as described. The tube end side directed toward the outer surface side of the stator body in the seal tube body is configured to form a skirt shape that expands the inner and outer diameters of the seal tube body toward the tube end. The damper device according to claim 1 or 2. The tube end side of the seal tube body, which is directed toward the end of the rotation axis of the rotor body, has a thickness that does not elastically expand beyond the thickness of the circumferential edge of the circumferential step surface formed on the rotation shaft. 4. The damper device according to claim 3, wherein the damper device is configured.

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