JPH109322A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary damper which is a type to utilize a dynamic pressure resistance mainly, and rotates while receiving a braking force to a rotary shaft along 360 deg.. SOLUTION: Inside a main body case 2, a small diameter part 2d, and large diameter parts 2e and 2f formed at both sides of the small diameter part 2d, are formed. A liquid chamber is formed by the inner surfaces of the large diameter parts 2e and 2f, and the outer surface of a rotary shaft 3. Vanes 4 and 5 are formed along the axial direction of the rotary shaft 3, allowable to project from the outer surface of the rotary shaft 3 at each liquid chamber, and making the rotating scope of the end edges of the vanes 4 and 5 while sliding to the inner surfaces of the large diameter parts 2e and 2f different at each liquid chamber. While the rotary shaft 3 rotates by 360 deg., the end edge of either vane 4 or 5 is slid to the corresponding inner surfaces of the large diameter parts 2e and 2f necessarily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotary damper,
In particular, it relates to a rotary damper that exerts a braking force over 360 degrees.

[0002]

2. Description of the Related Art A rotary damper mainly uses a viscous resistance of a viscous liquid filled in a main body case.
There is a type that mainly uses dynamic pressure resistance generated by pressing a viscous liquid through an orifice formed of small holes or gaps. Among them, a braking force generated mainly by using the dynamic pressure resistance can be larger than that generated by mainly using the viscous resistance.

[0003]

However, in a type mainly using dynamic pressure resistance, as shown in FIG. 7, a viscous liquid filled in a liquid chamber 104 formed in a main body case 100 is rotated by a rotating shaft. Since it is necessary to press with a vane 103 protruding from 102, a fixed partition 101 is always provided inside. For this reason, the rotation angle of the rotary shaft 102 of the type mainly using the dynamic pressure resistance is at most from one surface 101a to the other surface 101b of the fixed partition 101, and in this type, the rotary shaft 102 receives a braking force over 360 degrees. Conventionally, there is no one that can rotate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has as its object to provide a rotary damper of a type mainly utilizing dynamic pressure resistance, wherein a rotary shaft rotates while receiving a braking force over 360 degrees. I do.

[0005]

In order to achieve the above object, a rotary damper according to the present invention comprises: a rotary shaft disposed in a main body case; and a rotary shaft mounted on the rotary shaft and having an inner surface of the main body case and an outer surface of the rotary shaft. A rotary vane having a vane that presses a viscous liquid filled in a liquid chamber formed by a liquid chamber, wherein the rotary damper has a small-diameter portion in the main body case and a large-diameter portion formed by sandwiching the small-diameter portion, A plurality of liquid chambers are formed by the inner surface of each large diameter portion and the outer surface of the rotating shaft, and the vane is provided along the axis of the rotating shaft so as to protrude from the outer surface of the rotating shaft for each liquid chamber, and The range in which the edge of each vane rotates while sliding on the inner surface of each large-diameter portion differs for each liquid chamber, while the edge of one of the vanes always corresponds while the rotation shaft rotates 360 degrees. It is provided so as to slide on the inner surface of the large diameter part And wherein the door.

For example, two liquid chambers are formed by providing the large-diameter portion at two locations with one small-diameter portion interposed therebetween, and the vane disposed in one of the liquid chambers rotates. While the rotation angle of the shaft is from the rotation start position to １ ／ rotation and from ／ rotation to ／ rotation, the edge slides on the inner surface of the large-diameter portion forming the one liquid chamber, The vane arranged in the other liquid chamber has a rotation angle of the rotation shaft of 1 /
Between the fourth rotation and the 2/4 rotation and between the 3/4 rotation and the rotation start position, the other liquid chamber may be provided such that the edge is in sliding contact with the inner surface of the large diameter portion forming the other liquid chamber.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, reference numeral 1 denotes a rotary damper according to the present embodiment, which includes a main body case 2, a rotary shaft 3, a first vane 4, and a second vane 5.

The main body case 2 is formed in a substantially cylindrical shape as shown in FIG. The rotating shaft 3 described later is housed with one end 3a protruding from one end 2a of the main body case 2, and the first and second vanes 4 and 5 are housed inside the main body case 2 together with the rotating shaft 3. You. And caps 21 and 22 are attached to prevent these from coming off.
The cap 2 attached to the other end 2b of the main body case 2
2, a bearing hole 22a for the rotating shaft 3 is formed in the inner end face. A flange 2c is protruded around the other end 2b of the main body case 2. This is used to fix the main body case 2.

The main body case 2 further includes a small-diameter portion 2d having an inner diameter substantially equal to the outer diameter of the rotary shaft 3 at substantially the center in the axial center direction, and is formed on both sides of the small-diameter portion 2d. First and second large diameter portions 2e and 2f larger than the diameter are formed. The inner diameter of the small diameter portion 2d is larger than the large diameter portions 2e and 2f.
It is not limited to this as long as it is smaller than the diameter of. As a result, as shown in FIGS. 2 and 3, the outer surface of the rotating shaft 3 and the large-diameter portions 2e and 2f form the first and second shafts.
Liquid chambers 2g and 2h are formed.

More specifically, the inner surface of the large-diameter portion 2e forming the first liquid chamber 2g is viewed from the cross section of FIG. 2 at 0 ° to 90 ° (clockwise from the rotation start position). In the range of (rotation), the protruding edge 4 a of the first vane 4, which will be described later, is centered on the axis d of the rotation shaft 3 and is 0 to 90 degrees.
Distance x from axis d to edge 4a in the position of degree
Along the arc drawn with a radius of the same length as the above, in the range of 180 degrees to 270 degrees (2/4 rotation to 3/4 rotation) in the figure, the axis d of the rotation shaft 3 is centered, and Along the arc drawn with the same length as the radius r, 90 degrees to 180 degrees (1 /
4 to 2/4) and 270 to 0 (3/4)
In the range from the rotation to the rotation start position), the diameter y between the inner surfaces passing through the opposing axis d in this range is drawn so as to be longer than the length between both end edges 4a and 4b of the first vane 4. It is formed along an arc.

On the other hand, the inner surface of the large diameter portion 2f forming the second liquid chamber 2h is formed in a reverse relationship to the first liquid chamber 2g. That is, when viewed from the cross section of FIG. 3, in the range of 90 degrees to 180 degrees (1/4 rotation to 2/4 rotation), the second vane described later is centered on the axis d of the rotating shaft 3. 5 along an arc drawn with a radius having the same length as the distance x 'from the axis d to the edge 5a when the protruding edge 5a is at a position between 90 degrees and 180 degrees, and 270 degrees in the figure. In the range from to 0 degree (3/4 rotation to rotation start position), along the arc drawn with the same length as the radius r of the rotation axis 3 around the axis d of the rotation axis 3, In the range of 90 degrees (1/4 rotation from the rotation start position) and 180 degrees to 270 degrees (2/4 rotation to 3/4 rotation), the diameter y 'between the opposing inner surfaces in this range is the second vane 5 Are formed along an arc drawn so as to be longer than the length between both end edges 5a and 5b.

The rotating shaft 3 is, as shown in FIGS.
A size in which a first vane 4 to be described later can be inserted in a substantially central portion in the axial center direction and closer to one end 3a than a portion 3c located in the small-diameter portion 2d when disposed in the main body case 2. A first vane insertion hole 31 penetrating in the diameter direction is formed. Further, a portion of the main body case 2 closer to the other end 3b than the portion 3c located in the small diameter portion 2d is diametrically large enough to allow the second vane 5 to be inserted therethrough, and extends through the first vane insertion hole 31. A second vane insertion hole 32 that penetrates in the same direction as that of FIG. However, in the present embodiment, since one rotating shaft 3 formed integrally is used,
If the two vanes 4 and 5 are attached to the respective vane insertion holes 31 and 32 in advance, the rotating shaft 3 and the vanes 4 and 5 cannot be disposed at predetermined positions in the main body case 2.
Therefore, in the present embodiment, at least one of the second vanes 5 is inserted into the second vane insertion hole 3 so that the rotary shaft 3 is disposed at a predetermined position in the main body case 2 and then assembled.
Reference numeral 2 denotes a groove formed by cutting out a predetermined depth from the other end 3b of the rotating shaft 3 (see FIG. 6). After arranging the second vane 5 in the second vane insertion hole 32, the auxiliary cap 23 having the groove filling portion 23a is attached to the extra groove portion 32a. 3b is provided together with the auxiliary cap 23 in a bearing hole 22a formed in the cap 22. However, for example, as the rotating shaft 3, a portion 3c located in the small diameter portion 2d of the main body case 2
If the one that can be joined at the time of assembling is adopted, both the vane insertion holes 4 and 5 may be hole-shaped, and the auxiliary cap 23 is unnecessary.

The first and second vanes 4 and 5 have substantially the same thickness as the above-described first and second vane insertion holes 31 and 32, and have one of the edges 4a, 4b or 4b. 5
The a and 5b are formed so as to slide in the respective vane insertion holes 31 and 32 by contacting the inner surfaces of the large diameter portions 2e and 2f. In FIG. 1, the length along the direction of the axis d is the length of the first and second vane insertion holes 31, 32 and the length of the first and second liquid chambers 2g, 2h in the direction of the axis d. And almost match. Further, between the edges 4a and 4b or the edge 5
In the case of the first vane 4, the length between a and 5b is the first length.
In the liquid chamber 2g of FIG.
In the case of the second vane 5, in the second liquid chamber 2h, in the second liquid chamber 2h, the angle is 90 degrees to 180 degrees and 270 degrees in FIG. It is the same length as the distance between the opposing inner surfaces in the range of 0 ° to 0 °.

In the present embodiment, the first and second vanes 4 and 5 have respective edges 4a and 4b or 5a and 5b, respectively.
Slightly inside, each two through-holes 4c, 4d and 5
c, 5d are formed. In addition, each through-hole 4c, 4
d, 5c and 5d are rotating shafts 3 in the direction in which the braking force is exerted.
A valve mechanism is adopted in which the valve mechanism is closed when is rotating, and is opened when the rotating shaft 3 is rotating in the opposite direction. Although the valve mechanism is not limited, in the present embodiment, one of the preceding through holes 4c, 4d, 5c, and 5d as the through holes 4c, 4d, 5c, and 5d when rotating in the direction of exerting the braking force (the direction of arrow R). A large-diameter hole is formed on the surface side and a small-diameter hole is formed on the other surface side. Steel balls 4e, 4 are provided in each large-diameter hole.
f, 5e and 5f are adopted.

The rotary damper 1 according to the present embodiment is assembled as follows. First, the first vane 4 is mounted on the first vane insertion hole 31 of the rotating shaft 3. Next, this is inserted into the main body case 2 from one end 2a side. Next, cap 2
1 and a second vane 5 formed in a groove shape from the other end 2 b side of the main body case 2.
Attach to 2. Thereafter, the auxiliary cap 23 is fitted into the surplus portion 32a of the second vane insertion hole 32, and the cap 22
Is attached to the other end of the main body case 2.

Here, the position of the rotating shaft 3 is regulated by the small diameter portion 2d of the main body case 2, and is disposed so as to slide within the small diameter portion 2d. Therefore, of the inner surfaces of the first and second large-diameter portions 2e and 2f, the rotating shaft 3 is formed similarly to the small-diameter portion 2d.
The portion of the arc drawn with the same radius as the radius r of the rotating shaft 3 with the center d as the center (the portion from 180 degrees to 270 degrees in FIG. 2,
(The portion between 270 degrees and 0 degrees in FIG. 3) is also arranged so that the outer surface of the rotating shaft 3 is in contact with the rotating shaft 3.

The rotary damper 1 thus assembled
Are fixedly arranged and used using the flange portion 2c.
In FIG. 2, the direction in which the braking force is exerted (the direction of arrow R)
When the rotation shaft 3 rotates at a rotation angle of 0 to 90 degrees, the steel balls 4e provided on the first vane 4
4f closes through holes 4c and 4d. Since the other edge 4b of the first vane 4 is located in the range of 180 degrees to 270 degrees formed by an arc having the same radius as the radius r of the rotating shaft 3, the end surface 4b is formed by the inner surface. It is located at the same position as the outer surface forming line of the rotating shaft 3 in the first vane insertion hole 31 so as to be pushed in. As a result, the one edge 4a protrudes from the outer surface forming line of the rotating shaft 3 and contacts the inner surface of the large diameter portion corresponding to the rotation angle of 0 to 90 degrees in the first liquid chamber 2g while rotating the rotating shaft 3 Rotate with. Thereby, of the viscous liquid filled in the first liquid chamber 2g, the viscous liquid filled on the rotation direction side of the first vane 4 is pressed, and the first vane 4 and the inner surface of the large-diameter portion are pressed. Move to the opposite side across the first vane 4 through a small gap or the like. Thereby, dynamic pressure resistance is exerted, and the rotating shaft 3 rotates slowly.

When the rotation is further performed in the direction of arrow R and the rotation angle reaches a range from 90 degrees to 180 degrees, in the first liquid chamber 2g, one end edge 4a of the first vane 4 has a rotation angle of 90 degrees. The other edge 4b is located in the range from 270 degrees to 0 degrees in FIG. For this reason, neither edge 4a, 4b is in contact with the inner surface of the large-diameter portion.
No braking force is exerted by the vane 4. On the other hand, in the second liquid chamber 2h, one edge 5a contacts the inner surface of the large-diameter portion 2f within the rotation angle range. Thus, the rotation shaft 3 rotates slowly even in the range of the rotation angle as described above.

The rotating shaft 3 is further rotated in the direction of arrow R, and one edge 4a is positioned within the first liquid chamber 2g in FIG.
When it reaches the range of 0 to 270 degrees, one edge 4a is pressed against the inner surface of the range, and the other edge 4b is the inner surface of the large diameter portion in the range of 0 to 90 degrees in FIG. Touch As a result, in the same manner as described above, the rotation axis
Will rotate slowly. During this time, the second
In the liquid chamber 2h, the other edge 5b of the second vane 5 is located in a range from 180 degrees to 270 degrees in FIG. 2, and one edge 5a is located in a range from 0 degrees to 90 degrees in FIG. Therefore, the edges 5a and 5b do not contact the inner surface of the large diameter portion 2f, and the second vane 5 does not exert a braking force.

When the rotating shaft 3 further rotates in the direction of the arrow R, and the one edge 4a of the first vane 4 in the first liquid chamber 2g reaches a range from 270 degrees to 0 degrees in FIG. The other edge 4b is located in the range of 90 degrees to 180 degrees in FIG. 2 and does not contact the inner surface of the large-diameter portion 2e, so that the first vane 4 does not exert a braking force.
However, in the second liquid chamber 2h, since the other edge 5b of the second vane 5 is located between 270 degrees and 0 degrees, the other edge 5b is pressed against the inner surface in the meantime and the one edge 5b is pressed.
a rotates while contacting the inner surface in the range of 90 degrees to 180 degrees, and a braking force is exerted.

When the rotating shaft 3 is further rotated in the direction of the arrow R, the above process is repeated, and as long as the rotating shaft 3 rotates in the direction, the braking force utilizing the dynamic pressure resistance is exerted.

On the other hand, when the rotating shaft 3 rotates in the direction of the arrow L, the steel balls 4e, 4f, 5e, 5f are separated from the small diameter holes in the through holes 4c, 4d, 5c, 5d.
As a result, the viscous liquid flows through the through holes 4c, 4d, 5c, 5
Since a large amount of movement is performed through d, dynamic pressure resistance is not generated and the rotation is smooth.

It is needless to say that the rotary damper of the present invention is not limited to the above embodiment. In the above-described embodiment, the gap between each vane 4, 5 and the inner surface of each large diameter portion 2 e, 2 f of the main body case 2 is used as the orifice for generating the dynamic pressure resistance. May be provided with small holes, or grooves may be formed on the inner surfaces of the large-diameter portions 2e, 2f to function as orifices.

In the above embodiment, a through-hole is provided,
Although a braking force is exerted when rotating in one direction (for example, the direction of arrow R), a 360-degree braking force is exerted in both directions without forming a through-hole depending on an object to which the rotary damper of the present invention is attached. May be adopted.

Further, in the above embodiment, two liquid chambers 2g and 2h are provided and two vanes 4 and 5 are provided. However, three or more of them may be provided. In this case, it is needless to say that the rotation angle at which each vane exerts a braking force corresponding to each liquid chamber differs according to the number of arrangements. However, at any rotation angle, at least one vane must correspond to at least one vane. It is necessary to provide such that it rotates while being in contact with the inner surface of the diameter portion.

[0026]

According to the rotary damper of the present invention, the braking force can be exerted over 360 degrees despite the use of the dynamic pressure resistance.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a rotary damper of the present invention.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a view taken along line BB of FIG. 1;

FIG. 4 is a view taken along line CC of FIG. 1;

FIG. 5 is a left side view of FIG. 1;

FIG. 6 is an exploded perspective view for explaining a method of disposing a rotating shaft and two vanes used in the embodiment.

FIG. 7 is a diagram showing an example of a conventional rotary damper using dynamic pressure resistance.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation damper 2 Main body case 3 Rotation axis 4 First vane 5 Second vane

Claims (2)

[Claims] A rotary shaft disposed in the main body case, a vane attached to the rotary shaft and pressing a viscous liquid filled in a liquid chamber formed by an inner surface of the main body case and an outer surface of the rotary shaft; A rotary damper having a small-diameter portion and a large-diameter portion formed with the small-diameter portion sandwiched in the main body case, wherein the plurality of liquid chambers are formed by an inner surface of each large-diameter portion and an outer surface of a rotating shaft. The vane is provided so as to protrude from the outer surface of the rotary shaft for each liquid chamber along the axial direction of the rotary shaft, and the vane is turned while slidingly contacting the inner surface of each large diameter portion. While the range of movement differs for each liquid chamber, the edge of any one of the vanes is provided so as to be always in sliding contact with the inner surface of the corresponding large-diameter portion while the rotation shaft rotates 360 degrees. Rotating damper. 2. The method according to claim 1, wherein the large-diameter portion sandwiches one small-diameter portion.
By being provided at each location, the two liquid chambers are formed, and the vane arranged in one of the liquid chambers further includes:
While the rotation angle of the rotation shaft is between the rotation start position and 1/4 rotation and between 2/4 rotation and 3/4 rotation, the edge slides on the inner surface of the large-diameter portion forming the one liquid chamber. The vane arranged in the other liquid chamber forms the other liquid chamber when the rotation angle of the rotating shaft is between 1/4 rotation and 2/4 rotation and between 3/4 rotation and the rotation start position. 2. The rotary damper according to claim 1, wherein an end edge of the rotary damper is provided so as to slidably contact an inner surface of the large diameter portion.