JPH0674263A - Rotary damper - Google Patents

Abstract

PURPOSE:To provide a rotary damper easy to handle and capable of changing generated torque during one rotation of the damper besides obtaining desired torque easily and moreover easy to assemble/disassemble and capable of absorbing axial vibration with durability and simple structure without the lowering of torque. CONSTITUTION:A shaft part 31 with a flange part 32 at one end thereof is inserted into a casing 11 with internal space in such a way that the flange part 32 is accommodated at the middle part in the casing 11, and the shaft part 31 is protruded outside. Damping mechanism for imparting resistance to the relative rotation of the casing 11 and shaft part 31 is formed by disposing plural rolling elements 5 in the elastic pressure contact state in two bearing spaces 6 formed between the casing 11 and the shaft part 31 through the flange part 32, and radially extended bulge parts 33 are formed at both front-rear faces of the flange part 32. As a result, torque based on specified compressive deformation is generated when the rolling elements 5 roll on the plane of the flange part 32, and larger torque is periodically generated when the rolling elements 5 go over the bulge parts 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary damper which is applied to a rotating portion and a direct acting portion of various open / close lids, drawers of storages, wind direction adjusting devices of temperature control equipment and the like.

[0002]

2. Description of the Related Art A rotary damper resists unidirectional urging of a spring or the like acting on the rotating portion and the linear moving portion.
It has a function of applying braking to the movement and slowly operating the rotating portion and the linear movement portion.

Examples of such rotary dampers are, for example, Japanese Utility Model Laid-Open No. 57-8604 and Japanese Utility Model Laid-Open No. 61-133134.
It is disclosed in the publication. The structure is such that grease is interposed in the bearing space formed by loosely fitting the protrusion on the side of the rotating shaft into the recess on the side of the holding member. The braking torque is generated in the member.

[0004]

However, the rotary damper described above has various problems as described below. Generally, it is not convenient and easy to handle during assembly and disassembly. High processing precision is required because the mating surface precision is required to eliminate grease leakage. The holding member and the rotary shaft member have complicated shapes, and it is difficult to obtain the required processing accuracy. Grease-resistant materials have to be used as materials for the holding member and the rotary shaft member, which is expensive. It is difficult to obtain the set torque. Torque reduction occurs due to deterioration of grease.

Furthermore, since there is no compressive deformation of the grease, it is not possible to absorb vibration in the direction of the rotation axis.

In particular, it is impossible to change the torque generated by the rotary damper during one rotation.

Generally, the viscosity of grease decreases at a high temperature, so if the torque is to be made constant or increased, the situation of the device must be increased.

Therefore, an object of the present invention is to solve all of the problems described above. Not only is it easy to handle and a desired braking torque is easily obtained, but also a desired torque fluctuation is possible during one rotation. At the same time, the present invention provides a rotary damper that can absorb vibrations in the direction of the rotation axis well and that has a durability and a simple structure that are easy to disassemble and assemble.

[0009]

In order to achieve the above object, the present invention comprises a holding member having a casing and a shaft member having one end inserted and supported in the casing of the holding member. A rotary damper provided with a braking mechanism for imparting resistance to relative rotation between members, the braking mechanism including a flange portion formed in the shaft member insertion portion in a casing, and sandwiching the casing and the flange portion. A plurality of rolling elements that roll in a state of being elastically pressed into contact with the same casing and a flange portion are arranged in a plurality of formed bearing spaces, and the casing and the flange portion, or a part of a surface of one of them The swelling portion is formed in the direction in which the rolling elements are pressed against each other.

As one aspect thereof, a flange portion is usually provided at the tip of the insertion portion of the shaft member, but the flange portion may be provided in the middle of the insertion portion of the shaft member. Further, as another embodiment of the present invention, a support means for rotatably supporting a plurality of elastic bodies in each of the bearing spaces on the same plane is provided, and as yet another aspect, a casing is provided with an axis line of the flange portion. Position adjusting means for adjusting the directional position is provided.

[0011]

The rotary damper according to the present invention comprises the casing of the holding member, the shaft portion having the flange portion in the casing insertion portion of the shaft member, and the elastic body. The holding member in the present invention means a member for holding the shaft member, and may have a sliding plate or the like (not shown) in addition to the casing, for example.
Further, the shaft member in the present invention may have a gear or the like (not shown) at one end of the shaft portion extending outside the casing.
Therefore, one of the holding member and the shaft member may rotate and the other may not rotate, or both of them may rotate.

As an example of the present invention, the operation of the rotary damper having a flange portion at the insertion end of the shaft portion will be described. When the holding member and the shaft member rotate relative to each other, they are arranged on both sides via the flange portion. The plurality of spherical elastic rolling elements that have been rolled roll while being compressed and deformed via the flange portion between the inner surface and the bottom surface of the lid member of the casing, and based on this compressed deformation, a desired amount of space between the holding member and the shaft member. Generates braking torque. In the present invention, for example, since bulging portions radially extending from the center are formed on both front and back surfaces of the flange portion, when the elastic rolling element gets over the bulging portion, the rolling elements are compressed more than the compression. , Generate a larger braking torque periodically. Further, since the flange portion is always movable in the casing in the rotation axis direction through the elastic rolling element, the axial vibration generated during the relative rotation between the holding member and the shaft member is reliably absorbed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on illustrated embodiments. 1 and 2 show a rotary damper that is a typical embodiment of the present invention, and FIG. 1 is a plan view of the damper.
FIG. 2 is an exploded view of the damper, and FIG. 3 is a torque generation characteristic diagram of the damper.

As described above, the rotary damper according to this embodiment has the casing 11 of the holding member 1 and the shaft portion 3 of the shaft member 3.
1 and the rolling element 5 are the main constituent members.
Therefore, in the following description, the casing 11 which is one of the constituent elements of the holding member 1 and the shaft portion 31 which is one of the constituent elements of the shaft member 3 will be mainly described.

In FIGS. 1 and 2, reference numeral 11 denotes a casing made of hard synthetic resin, which is one of the constituent elements of the holding member 1 composed of a bottomed cylindrical body 12 and a circular lid 13. A shaft insertion hole 14 is formed at the center of the bottom of the cylindrical body 12.
Are formed. Reference numeral 31 denotes a shaft portion made of hard synthetic resin, which is one of the constituent elements of the shaft member 3.
A flange portion 32 is formed at one end of the. And
A plurality of (four in the illustrated example) bulging portions 33, 33, extending radially from the center are formed on both front and back surfaces of the flange portion 32. The bulging shape of the bulging portion 33 is not limited to the illustrated example. The elastic rolling element 5 is a spherical body made of a material such as rubber, silicon, urethane foam, or thermoplastic elastomer and capable of elastic deformation, but may be, for example, a roller-shaped rolling element.

As shown in FIG. 1, the assembly is carried out by first accommodating a plurality of (4 in the illustrated example) elastic rolling elements 5, 5, ... Inside the bottomed cylindrical body 12, and then the bottomed cylindrical body. In the shaft portion insertion hole 14 formed in the center of the bottom portion of the rolling element 12,
The shaft portion 31 of the shaft member 3 is inserted through 5, ... At this time, each rolling element 5 is arranged between the adjacent bulging portions 33 formed on the back surface of the flange portion 32. Next, a plurality of (4 in the illustrated example) elastic rolls are also placed in the space formed between the bulging portions 33 formed on the surface of the flange portion 32 and the inner peripheral surface of the bottomed cylindrical body 12. After housing the moving bodies 5, 5, ..., A circular lid 13 is fixed to the open end of the bottomed cylindrical body 12 with, for example, an adhesive. At this time, the elastic rolling elements 5, 5, ... Stored in two stages via the flange portion 32 receive an axial compressive force between the bottom surface of the casing 11 and the inner surface of the circular lid 13. In this state, each is compressed and deformed by a predetermined amount in the axial direction.

In the rotary damper according to the present embodiment assembled in this way, when the holding member 1 and the shaft member 3 rotate relatively, the spherical elastic rolling elements 5, 5, ...
Between the bottom and the flange portion 32 of the shaft portion 31 rolls while being compressed and deformed, and also overhangs the bulging portion 33 while being further compressed and deformed. Due to the movement of the rolling element 5, a braking torque that periodically changes as shown in FIG. 3 is generated between the casing 11 and the shaft portion 31. Also,
During this rotation, even if axial vibration occurs between the holding member 1 and the shaft member 3, the shaft portion 31 is divided into the elastic rolling elements 5, 5, ... Or
Since each moves forward and backward while compressing and deforming in the axial direction,
The vibration is sufficiently absorbed.

In the above embodiment, the elastic rolling element 5 is a spherical body, but other than this spherical shape, for example, a cylindrical shape or a truncated cone shape can be used. The axis is arranged so as to be orthogonal to the axis of the shaft portion 11. When the elastic rolling element 5 has a frustoconical shape, both the front and back surfaces of the flange portion 32 are formed as umbrella-shaped surfaces in accordance with the rolling, and the bottom surface 15 of the casing 11 is formed.
Also, the inner surface 16 of the circular lid 13 needs to be formed as an umbrella-shaped surface.

4 and 5 show another embodiment of the present invention, FIG. 5 is an exploded view of the rotary damper, FIG. 6 (a) is the same longitudinal sectional view, and FIG. 6 (b) is the same plan view. . In this example, two ring members 7 and 7 are newly added as constituent members in addition to the above-described embodiment, and three rod-shaped support members 71 are respectively attached to the ring members 7 and 7 toward the center. , 71, 7
1 are formed so as to project at equal intervals, and on the other hand, a support member insertion hole 51 through which the rod-shaped support member 71 is inserted is formed on the rolling axis of each elastic rolling element 5. When the rotary damper is assembled, the respective support members 71 are inserted into the support member insertion holes 51 of the respective elastic rolling elements 5 so that the three elastic rolling elements 5, 5, 5 are rolling during the rolling as shown in FIG. While maintaining the mutual positional relationship, the rolling surface of the elastic rolling element 5 is made constant so that the relative rotation of the holding member 1 and the shaft member 3 is not hindered. In this example, the flange portion 3
Three spherical elastic rolling elements 5 are used to sandwich the two, but the number is not limited to three, and the shape thereof is cylindrical or truncated cone as described above. It is also possible. Of course, also in each of the embodiments, radial bulging portions 33 are formed on both front and back surfaces of the flange portion 32.

FIG. 6 shows another embodiment of the casing of the present invention, in which the position of the circular lid 13 can be moved and adjusted in the axial direction inside the bottomed cylindrical body 12 to adjust the compression force of the elastic body 5. I am able to do it. In the illustrated example, the outer screw 18 is formed on the outer peripheral surface of the circular lid 13 having the rotation operation groove 17 at the center of the outer surface, and the inner screw 19 is formed on the inner surface of the open end of the bottomed cylindrical body 12 to form a circular shape. Cover 13 with bottomed cylinder 1
It is possible to move back and forth in the axial direction of 2, and by moving the circular lid 13 forward and backward with respect to the bottomed cylindrical body 12 by using an operating tool (not shown), the bottomed cylindrical body 12 via the flange portion 32 of the shaft portion 31. By adjusting the compressive force applied to the elastic body 5 by the bottom surface and the inner surface of the circular lid 13, the magnitude of the relative braking torque between the holding member 1 and the shaft member 3 is adjusted. The bottomed cylindrical body 12
In contrast to the illustrated example, the screw fitting between the circular lid 1 and the circular lid 13
3 is formed into a dish shape to form an internal thread, and an external thread is formed on the bottomed cylindrical body 12 so that the circular lid 13 is closed.
It may be screw-fitted so as to cover.

FIG. 7 and FIG. 8 also show the above casing 1
A modified example of No. 1 is shown, in which a bottomed cylindrical body 12 is provided with a dish-shaped circular lid 13
FIG. 8 shows one fixing mode when fitting and fixing. In the example of FIG. 8, the annular projection 1 is formed on the outer peripheral surface of the open end of the bottomed cylindrical body 12.
9 is formed, and the protrusion 1 is formed on the inner peripheral surface of the circular lid 13.
9, an annular groove 20 is formed to be fitted into the engagement groove 9, and in the example of FIG. 9, the engaging claw 2 is attached to the tip extending from the outer circumference of the circular lid 13 in parallel with the axial direction.
A plurality of engaging arms 22 each having No. 1 are provided, and engaging grooves 23, 23, ... Are formed at positions on the outer peripheral surface of the bottomed cylindrical body 12 with respect to the engaging claws 21, 21 ,. With this configuration, the circular lid 13 can be fitted and fixed to the bottomed cylindrical body 12 by one-touch operation.

As is clear from the above description, the present invention is not limited to the above-mentioned embodiment, and for example, the flange portion can be provided in the middle of the shaft portion, and instead of the elastic rolling elements described above. The rolling elements are made of hard material,
An elastic material such as foamed rubber or urethane resin can be fixed on the rolling element pressure contact surfaces of the flange portion and the casing, and such a configuration is also included in the scope of the present invention.

[0023]

According to the present invention, the following excellent effects, which cannot be expected in the conventional rotary damper using grease or governor, are exhibited. It is possible not only to generate a constant torque during one rotation of the rotary damper as in the prior art, but also to periodically generate a desired torque. Further, by appropriately setting the protruding height of the bulging portion, it is possible to change the torque by a desired amount during one rotation. Since all are composed of solid parts with a simple structure, it is easy to handle during assembly and disassembly. Since there is no need to worry about fluid leakage, high processing accuracy is not required. Both the holding member and the rotary shaft member are simple in shape,
Easy to process. As for the material of the holding member and the rotary shaft member, it is sufficient to consider only the strength, so that the cost can be reduced. Easy to obtain set torque. Since the rolling element is simply rolled in an elastic pressure contact state, there is no torque reduction and durability is high. Since the elastic body in the bearing space is arranged in multiple stages via the flange portion of the shaft portion, vibration in the axial direction during relative rotation between the holding member and the shaft member is well absorbed. The generated torque is always stable even at high and low temperatures.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary damper showing a typical embodiment of the present invention.

FIG. 2 is an exploded view of the rotary damper.

FIG. 3 is a characteristic diagram of generated torque of the rotary damper.

FIG. 4 is an exploded view of a rotary damper according to another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a configuration of the damper.

FIG. 6 is a vertical cross-sectional view showing an embodiment of a casing having a compression force adjusting mechanism for elastic rolling elements in the rotary damper.

FIG. 7 is a vertical sectional view showing a modified example of the casing of the rotary damper that can be assembled by one-touch operation.

FIG. 8 is a structural explanatory view showing another modified example of the casing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holding member 11 Casing 12 Bottomed cylindrical body 13 Circular lid 14 Shaft part insertion hole 15 Bottom surface 16 Inner surface 17 Rotating operation groove 18 Outer screw 19 Inner screw 20 Annular protrusion 21 Annular groove 22 Engaging claw 23 Engaging arm 24 Engaging groove 3 shaft member 31 shaft part 32 flange part 33 bulge part 5 (elastic) rolling element 51 rod-shaped support member insertion hole 6 bearing space 7 ring member 71 rod-shaped support member

Claims (1)

[Claims] 1. A braking mechanism comprising a holding member having a casing and a shaft member having one end inserted and supported in the casing of the holding member, the braking mechanism imparting resistance to relative rotation between the holding member and the shaft member. In the rotary damper, the braking mechanism includes a flange portion formed in the shaft member insertion portion in a casing, and the casing and the flange portion in a plurality of bearing spaces formed by sandwiching the casing and the flange portion. A plurality of rolling elements that roll in a state of being elastically pressed are provided, and a bulging portion is formed in a direction in which the rolling elements are pressed against the casing and / or the flange portion or a part of one surface thereof. Rotating damper characterized by