JPH0719277A - Finite angular rotation damping device - Google Patents

Abstract

PURPOSE:To provide a damping device which is used instead of a bearing metal and connectable to the other member without especially needing parts. CONSTITUTION:A shaft member 12 rotatable by an finite angle is incorporated in a casing 10 having a hollow chamber 11 and a shaft member 12 is provided with a valve body 13 to change the magnitude of fluid resistance of viscous fluid, with which the chamber 11 is filled, according to a rotation direction. A first engaging member 14 engaged with one member is arranged to the end part of the casing 10 as a means to mount the casing 10 and the shaft member 12 on other two members effecting relative rotation. A second engaging part 15 engaged with the other is arranged to the end part of the shaft member 12 and the engaging parts 14 and 15 are formed in size smaller than that of the outer shape of the casing 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finite angle damping device which gives a significant damping force to a rotary motion of a constant angle.

[0002]

2. Description of the Related Art There are various products of so-called rotary dampers that give a damping force to a rotary motion, but in order to provide a damper that is small and exhibits a remarkable damping force, the present inventor uses a so-called torque grease. Developed a damping device that produces different resistance depending on the direction of rotation (JP-A-4-
282039). Compared with the former rotary dampers, this device is small in size and has a great damping force, so it has been well received. However, it has been pointed out that the device still has a large number of parts, requires labor in manufacturing, and is wasteful in attaching to other members.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is to streamline the structure so that the apparatus is configured with a minimum number of parts and to outline the outer shape of the casing. Is the maximum dimension so that the main body and the rotating member can perform relative rotation with a remarkable damping action on the same axis.

In addition, the present invention can replace the bearing fittings, for example, or when connecting with other members,
In particular, the purpose is to be able to be incorporated into other members without requiring parts.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a casing 10 having a chamber 11 whose one end in the axial direction is opened, and a shaft member 12 incorporated in the chamber 11 so as to be rotatable by a finite angle. And a viscous fluid that can flow due to the rotation of the shaft member 12 is filled in the chamber 11 and the opening side of the chamber 11 is sealed to seal the shaft member 12 into the casing 1.
The shaft member 12 is provided with a valve body 13 which is pivotally supported at 0 and which changes the flow resistance of the viscous fluid depending on the rotation direction of the shaft member 12.
As a mounting means for mounting the casing 10 and the shaft member 12 to two mating members having a relative rotational relationship, a first engaging portion 14 for engaging the casing 10 with one mating member.
Is provided at the end of the casing 10, while the second engaging portion 15 that engages the rotating member 12 with the other mating member is provided with the shaft member 1.
The first and second engaging portions 14 and 15 are provided at the end of the casing 2, and the outer shape of the casing 10 is maximized to form a smaller size.

[0006]

FIG. 1 shows an example of a finite angle rotary damping device according to the present invention. The cross section and the state of movement are schematically shown in FIG. 2, and the specific structure is shown in FIGS. 3 and 4.

The main body of the apparatus has a casing 10 having a cylindrical chamber 11 whose one end in the axial direction is open and whose other end is closed, and a shaft member 12 which is rotatably incorporated in the chamber 11 at a constant angle. Consists of. The chamber 11 is filled with the viscous fluid G that can flow by the rotation of the shaft member 12, and the valve member 13 that changes the flow resistance of the viscous fluid G in accordance with the rotation direction of the shaft member 12 is provided on the shaft member 12. It constitutes a damping mechanism. 18 and 18 'are rotation stoppers, and the shaft member 1
The rotation angle θ of 2 is defined. The example is one on the interior wall
The shaft member 12 is provided at two positions at intervals of 80 degrees and allows the shaft member 12 to rotate within a range of approximately 120 degrees.

The casing 10 has a cylindrical shape having an outer shape similar to that of the cylindrical chamber 11, and has an end surface 19 at the closed other end.
The center of is coincident with the rotation axis L of the shaft member 12. At the center of the end face 19, a recess 20 for receiving the other end of the shaft member 12 is formed. A member that surrounds the recess 20 outside the end surface 19 is used to form the first engaging portion 14 as described later (see FIG. 3). Recess 2
The positional relationship between 0 and the spindle 21 may be reversed. That is, the recess 20 is formed on the end surface of the shaft member 12, and the support shaft 21 is formed on the chamber end surface 19.
Can be provided.

The shaft member 12 has at its tip a support shaft 21 which is inserted into the recess 20 and rotatably supported. On the other hand, the cap member 16 for closing the opening surface of the chamber 11 is combined with the casing 10, and in the bearing hole 22 formed at the center of the member 16, the outer portion of the shaft member 12 is rotatably supported. . Reference numeral 17 denotes an elastic ring that seals the shaft member 12 and the bearing hole 22. Room 11
The shaft that is placed inside of the
Two pa-shaped protrusions 23 and 23 'are formed on the shaft member 12 at intervals of 180 degrees in the axial direction, and the valve body 13 is arranged therein. A second engaging portion 15 is provided at one end of the shaft member 12 projecting from the chamber 11 to the outside. When the casing 10 and the cap member 16 are made of synthetic resin, both members are fixed and integrated by means such as adhesion or heat welding. W indicates the welded portion.

The valve body 13 has a substantially U-shaped or C-shaped cross-sectional shape which can be arranged so as to straddle the projecting portions 23, 23 ', and hanging pieces 24, 25 are respectively provided at the front and rear positions in the rotational direction. In addition, the valve body 13 and the protrusions 23 and 23 'are movable in the rotational direction. One of the hanging pieces 24, 25 (for example, 24) has an outer valve opening 26 provided so as to partially cut out the lower side of the central portion thereof, and the inner valve opening 27 corresponding to this has the protruding portion 23, A part of the upper side of the central portion of 23 'is cut away. Both valve openings 26 and 27 have a portion overlapping in the rotational direction, and the viscous fluid G can easily pass in the rotational direction preceded by the external valve opening 26, but becomes difficult in the opposite direction. Difficulty in passing gives a noticeable damping force to the rotary movement. Passages 28, 28 'for passing the viscous fluid G are provided between the other end (for example, 25) of the hanging pieces 24, 25 and the peripheral surface of the shaft member 12 (see FIG. 4).

The above-mentioned first engaging portion 14 is one of the two mating members A and the casing 1 which are in a mutually rotating relationship.
It is a means for engaging the 0 side. One of the mating members A is
It has a mounting opening 31 for inserting the casing 10, and an engagement receiving portion 32 for engaging the first engaging portion 14 inside thereof. The first engaging portion 14 shown in FIGS. 1 to 4 is
Circular cutouts are provided on both sides to provide parallel engaging surfaces 33, 33, which engage in rotation about the axis L. The parallel engagement surfaces 33, 33 can be long, and therefore accuracy can be improved.

The above-mentioned second engaging portion 15 is means for engaging the other side B of the two mating members having a relative rotational relationship with the shaft member 12 side. The other mating member B is provided with a mounting opening 34 for inserting the shaft member 12, and an engagement receiving portion 35 for engaging the second engaging portion 15 is provided on the inner surface thereof. Figure 1,
The second engagement portion 15 shown in FIG. 2 is formed by cutting out one side of the cylindrical shaft portion to form a planar engagement surface 36, and engages in rotation about the axis L.

The above-mentioned first and second engaging portions 14 and 15 can be modified as shown in FIG.

In FIG. 5, a first engaging portion 14 smaller than the diameter of the casing 10 is formed in a hexagonal column 41 at one end of the cylindrical casing 10, and both sides of a cylinder having a diameter smaller than the diameter of the casing 10 are formed at the other end. A so-called oval 42 with notches in parallel
This is an example in which the second engaging portion 15 is provided. The second engaging portion 15 of this example has the same shape as the first engaging portion 14 of the examples of FIGS. 1 and 2. FIG. 6 shows an example in which the first engaging portion 14 is a quadrangular prism 43 and the second engaging portion 15 is a substantially D-shaped portion 44 in which one side of the cylinder is cut out. This is the second engagement of the example of FIGS. 1 and 2. It has the same shape as the joint portion 15. FIG. 7 shows the first engaging portion 14 as the first engaging portion 1 of FIGS.
4 and the second engaging portion 15 is a square hole 37 having the same shape as the example of FIG. Reference numeral 38 denotes a lightening hole formed in the first engaging portion 14. These holes 37 and 38 prevent the first and second engaging portions 14 and 15 from being deformed by sink marks when the casing 10 and the shaft member 12 are molded with a synthetic resin. Contribute to improvement.

In FIG. 8, an axial key hole 46 is cut out on one side of one end of the casing 10 to form a first engaging portion 14, and an axial projection is formed on one side of the other end of the shaft member 12. This is an example in which 47 is provided as the second engaging portion 15. 9 is different from the above four examples, the casing 10 itself is provided with the first engaging portion 14 by forming the outer shape of the casing 10 into a hexagonal column 48, and the casing 10 projects outside the chamber 11 of the shaft member 12. This is an example in which the portion itself is formed into a square column 49 so as to act as the second engaging portion 15.

These first engaging portion 14 and second engaging portion 15
Both are integrally formed with the casing 10 and the shaft member 12, respectively. Therefore, when the casing 10 and the shaft member 12 are molded using a synthetic resin (in many cases, injection molding), they can be molded integrally with other parts by the molding die,
Therefore, in that case, the number of parts constituting the present device is only three, that is, the casing 10, the shaft member 12 and the valve body 13 (the two valve bodies have the same shape). It is also possible to form a brim-shaped flange that can be fitted to the open end of the casing 10 on the shaft member 12 and omit the cap member 16.

The present apparatus constructed as described above has the first and second
Since both of the engaging portions 14 and 15 have the outer shape of the casing 10 as the maximum dimension and are provided in a smaller size and engage in the rotational direction on the same axis, for example, the first engaging portion 14
Is engaged with one fixed side member A having a relative rotational relationship, and the second engaging portion 15 is engaged with the other rotational side member B, the device itself rotates about the axis L. It serves as a rotating shaft of a mechanism for rotating the side member B. It is necessary to provide the mating members A and B with the ports 31 and 34 for receiving the casing 10 and the shaft member 12 and the engagement receiving portions 32 and 35, respectively, but it is not necessary to provide other members. Not particularly.

In the shaft member 12, it is assumed that one of the limit positions of the rotation side member B is a state in which the outer valve opening 26 of the valve body 13 is located on the side surface of the rotation stoppers 18 and 18 'which is not blocked ( 2 (a)), the state where the valve opening 26 is located on the side surface closed by the rotation stoppers 18 and 18 'is the other limit position (FIG. 2 (b)). When the rotation side member B is rotated from one limit position where the outer valve opening 26 is not blocked by the rotation stoppers 18 and 18 ', the inner valve opening 27 hits the hanging piece 25 on the rear side in the rotation direction of the valve body 13. , The resistance is large, so that a large damping torque is exerted (FIG. 2 (b)).
Since 7 overlaps and separates from the hanging piece 25, the resistance decreases.
Therefore, when the rotating side member B is a lid, if the resistance is reduced in the opening direction and the resistance is increased in the closing direction, the lid will be closed quietly even if the hand is released.

[0019]

Since the present invention is constructed and operates as described above, the finite-angle damping device can be constructed with a minimum number of parts, and the size of the casing 10 can be set to the maximum size. Since the whole can be put together, significant rationalization and miniaturization can be achieved. Further, since the device according to the present invention is ultra-compact and has the engaging means, it can be installed between members without particularly needing other members, for example, to exert the function of a micro-miniature bearing fitting, and to exert a remarkable damping action. Produce an effect.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an embodiment of a finite angle damping device according to the present invention.

FIG. 2 (a) is a cutaway perspective view showing one operating state of the same device. (B) A broken perspective view showing another operating state of the above-mentioned device.

FIG. 3 is a III-II of FIG. 4 of the apparatus according to the embodiment as well.
The longitudinal cross-sectional view corresponding to the I line.

FIG. 4 is a transverse sectional view of the above.

FIG. 5 is a trihedral view showing a first modification.

FIG. 6 is a trihedral view showing a second modification.

FIG. 7 is a trihedral view showing a third modification.

FIG. 8 is a three-sided view showing a modified example 4.

FIG. 9 is a trihedral view showing a modified example 5;

Claims (5)

[Claims] 1. A viscous fluid which comprises a casing 10 having a chamber 11 having one axial end opened and a shaft member 12 which is rotatably mounted in the chamber 11 so as to be rotatable at a finite angle. The chamber 11 is filled with fluid, the opening side of the chamber 11 is sealed, the shaft member 12 is axially supported by the casing 10, and the valve body 13 for varying the flow resistance of the viscous fluid depending on the rotation direction of the shaft member 12 is used as the shaft. A first engaging portion 14 for engaging the casing 10 with one of the mating members is provided at the end of the casing 10 as a mounting means for mounting the casing 10 and the shaft member 12 to the two mating members having a relative rotational relationship. The rotary member 1
A second engaging portion 15 for engaging 2 with the other mating member is provided at the end of the shaft member 12, and the first and second engaging portions 14 and 1 are provided.
Reference numeral 5 is a finite-angle rotary damping device characterized in that the outer shape of the casing 10 is maximized and formed smaller. 2. A shaft-shaped portion having first and second engaging portions 14 and 15 having a concave-convex cross-section having notches or protrusions in a circular part or a polygonal cross-section for engaging rotation about an axis. The finite angle rotary damping device according to claim 1. 3. The casing 10 and the shaft member 12 are integrally molded products molded by molding synthetic resin, respectively. The casing 10 has a first engaging portion 14 and the shaft member 12 has a second engaging portion. The finite angle rotary damping device according to claim 1, wherein the joint portion 15 has a structure integrally provided by the molding. 4. A chamber 11 having one end opened is completely closed at the other end, and a recess 2 for bearing is formed at the center of an end face 19 of the chamber 11.
The finite-angle rotary damping device according to claim 1, wherein 0 is formed, and the shaft portion 21 projecting from the other end of the shaft member 12 is pivotally supported. 5. A casing 10 is combined with a cap member 16 for closing the opening side of the chamber 11, and a seal ring 17 capable of sliding contact with each other is provided on the cap member 16 or the shaft member 12 so that the chamber 11 is closed. The finite-angle rotary damping device according to claim 1, wherein the cap member 16 is integrally fixed to the casing 10 at a portion in contact with the opening edge.