JP4982449B2 - Rotary damper - Google Patents

Description

  The present invention relates generally to rotary dampers, and more particularly to unidirectional rotary dampers.

  Conventionally, a shaft member provided in the main body case, a viscous liquid filled in the main body case, and a plurality of pressure members provided in the main body case that press the viscous liquid by rotating around the shaft member. A rotary damper having a pressing means is known. This type of rotary damper decelerates the operating speed of the controlled object using the resistance of the viscous liquid generated by each pressing means pressing the viscous liquid. Further, in this type of rotary damper, there is a difference between the resistance of the viscous liquid generated when each pressing means rotates in one direction and the resistance of the viscous liquid generated when each pressing means rotates in the opposite direction. Some are unidirectional.

  The unidirectional rotary damper is configured so that each pressing means rotates in the opposite direction around the shaft member rather than the resistance of the viscous liquid generated when each pressing means rotates in one direction around the shaft member and presses the viscous liquid. And a control mechanism for reducing the resistance of the viscous liquid generated when the viscous liquid is pressed. For example, in Patent Document 1 below, when two vanes that function as pressing means rotate in one direction around a rotating shaft that functions as a shaft member, the vane is closed so that no viscous liquid can pass therethrough. A control mechanism is described that includes a reflux groove that is opened so that viscous liquid can pass through when rotated in the reverse direction, and a protrusion that opens and closes the reflux groove.

In general, the unidirectional rotary damper is designed so that the internal pressures of the plurality of chambers into which the viscous liquids pressed by the pressing units flow are uniform when the pressing units rotate in one direction. In practice, however, there may be a difference in the internal pressure of these chambers. Such a phenomenon occurs, for example, when there is variation in the size of the gap formed between the main body case and each pressing means. When such a phenomenon occurs, the braking characteristics vary, or the position of the shaft member shifts, and the shaft member excessively presses a seal member such as an O-ring, causing viscous fluid to leak. Problems arise.
JP 2000-120748 A

  The problem to be solved by the present invention is that, even when there are variations in the sizes of the gaps formed at various locations in the main body case, when the respective pressing means are rotated in one direction, they are pressed by the respective pressing means. It is an object of the present invention to provide a rotary damper capable of uniforming the internal pressure of a plurality of chambers into which a viscous liquid is introduced.

In order to solve the above problems, the present invention provides the following rotary damper.
1. A shaft member (3) provided in the main body case (1), a viscous liquid filled in the main body case (1), and provided in the main body case (1), with the shaft member (3) as a center. A plurality of pressing means (4a, 4b or 5a, 5b) that press the viscous liquid by rotating as shown in FIG. 5 and each pressing means (4a, 4b or 5a, 5b) rotates in one direction to press the viscous liquid. Control mechanism for reducing the resistance of the viscous liquid generated when each of the pressing means (4a, 4b or 5a, 5b) rotates in the opposite direction and presses the viscous liquid, rather than the resistance of the viscous liquid generated when A rotary damper comprising
When each pressing means (4a, 4b or 5a, 5b) rotates in one direction, a plurality of chambers (6a, 6b) containing the viscous liquid pressed by each pressing means (4a, 4b or 5a, 5b) ) Between the plurality of chambers (7a) into which the viscous liquid pressed by the pressing means (4a, 4b or 5a, 5b) flows at that time. , 7b), provided with a flow path (10) that allows the viscous liquid to flow therethrough.
2. A lid having a bottom surface that closes the opening of the main body case (1) and is in sliding contact with each pressing means (4a, 4b or 5a, 5b) when each pressing means (4a, 4b or 5a, 5b) rotates. 2. The rotary according to 1, further comprising a member (2), wherein the flow path (10) is provided in the main body case (1), the shaft member (3), or the lid member (2). damper.
3. The lid member (2) for closing the opening of the main body case (1), the pressing means (4a, 4b or 5a, 5b) and the lid member (2) are provided between the pressing means (4a). , 4b or 5a, 5b) and an intermediate member (11) having a bottom surface with which each pressing means (4a, 4b or 5a, 5b) is slidably contacted, and the flow path (10) includes the intermediate member 2. The rotary damper according to 1 above, wherein the rotary damper is provided on a member (11).
4). 2. The rotary according to 1, wherein the shaft member (3) is hollow, and the flow path (10) is provided so as to bypass the hollow portion (3 a) of the shaft member (3). damper.

According to the present invention, when each pressing means (4a, 4b or 5a, 5b) rotates in one direction, a plurality of viscous liquids pressed by each pressing means (4a, 4b or 5a, 5b) flow in. Since the flow path (10) that enables the flow of the viscous liquid only between the chambers (7a, 7b) is provided, when each pressing means (4a, 4b or 5a, 5b) rotates in one direction, It becomes possible to make the internal pressure of these chambers (7a, 7b) uniform. Therefore, even when there are variations in the sizes of the gaps formed at various locations in the body case (1), variations in braking characteristics can be suppressed, and the position of the shaft member (3) is shifted. Thus, it is possible to prevent the shaft member (3) from excessively pressing the seal member (12) and thereby causing leakage of viscous liquid.
Moreover, according to this invention, when each press means (4a, 4b or 5a, 5b) rotates to one direction, the viscous liquid pressed by each press means (4a, 4b or 5a, 5b) is accommodated. Since there is no flow path that allows the viscous liquid to flow between the plurality of chambers (6a, 6b), the structure is simple, and the decrease in the strength of the components due to the formation of the flow path is also minimal. To the limit.

  In one embodiment of the present invention, the rotary damper includes a main body case 1, a lid member 2, a shaft member 3, a viscous liquid, a pressing means, a control mechanism, and a flow path 10.

  The main body case 1 is also called a casing or a housing, and is shown in FIGS. The main body case 1 is typically a cylindrical body having one end opened and the other end closed, but is not limited thereto. In the main body case 1, there is a space 1a in which the shaft member 3 and the pressing means are accommodated and filled with a viscous liquid (see FIGS. 5, 6, and 8).

  The opening of the main body case 1 is closed by the lid member 2 (see FIGS. 1, 3, 4, 7, 9, and 11). The lid member 2 has a bottom surface with which the respective pressing means come into sliding contact when a plurality of pressing means to be described later rotate (see FIGS. 1, 3, 4, 7, 9, and 11).

  The shaft member 3 is provided so as to be positioned at the center of the space 1a in the main body case 1 (see FIGS. 5, 6, and 8). The shaft member 3 can be either hollow or non-hollow (see FIGS. 5 and 6). The main body case 1 and the shaft member 3 are relatively rotatable.

  A plurality of pressing means are provided between the main body case 1 and the shaft member 3 in the space 1 a in the main body case 1. The pressing means presses the viscous liquid by rotating around the shaft member 3. The main body so as to rotate together with the vanes 4a and 4b (see FIGS. 5, 6 and 8) provided so as to protrude from the outer peripheral surface of the shaft member 3 or the main body case 1 so as to rotate together with the shaft member 3. Partition walls 5a and 5b (see FIGS. 5, 6, and 8) provided so as to protrude from the inner peripheral surface of case 1 can function as pressing means. That is, when the body case 1 does not rotate and the shaft member 3 rotates, the vanes 4a and 4b function as pressing members, and when the shaft member 3 does not rotate and the body case 1 rotates, the partition wall 5a and 5b functions as a pressing member.

  The space 1a in the main body case 1 is partitioned by vanes 4a and 4b and partition walls 5a and 5b that can function as pressing means, whereby each pressing means (for example, each vane 4a and 4b) is provided in the main body case 1. Are formed with a plurality of chambers 6a, 6b filled with a viscous liquid to be pressed when rotating in one direction, and a plurality of chambers 7a, 7b into which the viscous liquid pressed by each pressing means flows at that time. (See FIG. 5, FIG. 6 and FIG. 8).

  The control mechanism is configured so that the viscosity of the viscous liquid generated when each pressing means rotates in the opposite direction and presses the viscous liquid rather than the resistance of the viscous liquid generated when each pressing means rotates in one direction and presses the viscous liquid. The resistance is reduced. Examples of the control mechanism include those shown in FIGS. 3, 5 to 9, and 11, but are not limited thereto. The control mechanism shown in FIGS. 3, 5 to 9, and 11 includes a passage 8 formed in the vanes 4 a and 4 b and a valve body 9 that opens and closes the passage 8. The passage 8 is configured to have a large hole portion 8a that opens to the chambers 6a and 6b and a small hole portion 8b that opens to the chambers 7a and 7b, and is formed between the chambers 6a and 6b and the chambers 7a and 7b. It enables the distribution of viscous liquids. The valve body 9 is provided in the large hole portion 8a. When the viscous liquid is about to flow from the large hole portion 8a to the small hole portion 8b, the passage 8 is closed, and the viscous liquid passes through the passage 8 and is chambered. The flow from 6a, 6b to the chambers 7a, 7b is prevented. On the other hand, when the viscous liquid tries to flow from the small hole portion 8b to the large hole portion 8a, the passage 8 is opened, and the viscous liquid flows from the chambers 7a and 7b to the chambers 6a and 6b via the passage 8. Enable.

  The flow path 10 allows the viscous liquid to circulate only between the plurality of chambers 7a and 7b into which the viscous liquid pressed by each pressing means flows when each pressing means rotates in one direction. The flow path 10 can be provided in the main body case 1, the shaft member 3, or the lid member 2 (see FIGS. 5 to 10). In addition, when each pressing means rotates in one direction, there is no flow path that allows the viscous liquid to flow between the plurality of chambers 6a and 6b that contain the viscous liquid pressed by each pressing means.

  In another embodiment of the present invention, the rotary damper further includes an intermediate member 11. The intermediate member 11 is provided between each pressing means and the lid member 2 and has a bottom surface with which each pressing means slides when each pressing means rotates (see FIG. 11). In this embodiment, the flow path 10 is provided in the intermediate member 11 (refer FIG.11 and FIG.12).

  1 to 5 are diagrams illustrating a rotary damper according to a first embodiment. In this rotary damper, the shaft 10 having a hollow flow path 10 is provided. More specifically, the flow path 10 includes an annular groove 10a formed in the shaft member 3, and grooves 10b and 10c branched from the groove 10a and opened to the two chambers 7a and 7b, respectively. 3 is provided so as to bypass the hollow portion 3a (see FIG. 5).

  The rotary damper according to the present embodiment operates as follows. That is, when the main body case 1 is fixed and the shaft member 3 rotates in one direction (clockwise direction in FIG. 5), the two vanes 4a and 4b functioning as pressing members are centered on the shaft member 3 together with the shaft member 3. Rotate in one direction as Thereby, the viscous liquid in the two chambers 6a and 6b is pressed by the vanes 4a and 4b. At this time, the viscous liquid in the chambers 6a and 6b flows into the large hole portion 8a of the passage 8, but the valve body 9 closes the passage 8, so that another two chambers 7a and 7b pass through the passage 8. It cannot flow in, but flows into the chambers 7a and 7b through a slight gap formed between the main body case 1 and the vanes 4a and 4b. Therefore, at this time, the viscous liquid generates a large resistance.

  When the gaps formed between the main body case 1 and the vanes 4a and 4b vary in size, the viscous liquid pressed by the vanes 4a and 4b when the vanes 4a and 4b rotate in one direction. The internal pressures of the two chambers 7a and 7b into which the gas flows are not uniform, but in the present embodiment, the flow path 10 that allows the viscous liquid to flow only between these chambers 7a and 7b is provided. When the viscous liquid flows between the chambers 7a and 7b through the flow path 10, the internal pressures of these chambers 7a and 7b can be made uniform. Therefore, even when there are variations in the sizes of the gaps formed at various locations in the main body case 1, the variation in braking characteristics can be suppressed, and the position of the shaft member 3 is shifted and the shaft member 3 is displaced. Can be prevented from over-squeezing the seal member 12 and thereby causing leakage of viscous liquid.

  When the vanes 4a and 4b rotate in the opposite directions (counterclockwise in FIG. 5), the viscous liquid in the two chambers 7a and 7b is pressed by the vanes 4a and 4b. At this time, the viscous liquid in each of the chambers 7a and 7b flows into the small hole portion 8b of the passage 8, separates the valve body 9 from the valve seat, and opens the passage 8, so that another 2 is passed through the passage 8. It flows into the two chambers 6a and 6b. Since the passage 8 is designed not to cause resistance to the viscous liquid flowing therethrough, the resistance of the viscous liquid generated at this time is small.

  FIG. 6 is a diagram illustrating the rotary damper according to the second embodiment. The rotary damper is provided on the shaft member 3 in which the flow path 10 is not hollow. This flow path 10 consists of a hole that penetrates the shaft member 3 and that opens at both ends into the two chambers 7a and 7b (see FIG. 6).

  When the size of the gap formed between the main body case 1 and the vanes 4a and 4b varies, when the vanes 4a and 4b rotate in one direction (clockwise in FIG. 6), the vanes Although the internal pressures of the two chambers 7a and 7b into which the viscous liquid pressed by 4a and 4b flows are not uniform, in this embodiment as well, the viscous liquid is only between these chambers 7a and 7b. Since the flow path 10 enabling the flow is provided, the viscous liquid flows between the chambers 7a and 7b through the flow path 10 to make the internal pressures of the chambers 7a and 7b uniform. Can do.

  7 and 8 are diagrams illustrating the rotary damper according to the third embodiment. In the rotary damper, a flow path 10 is provided in the main body case 1. More specifically, the flow path 10 includes an annular groove 10e formed in the main body case 1 and grooves 10f and 10g branched from the groove 10e and opened to the two chambers 7a and 7b, respectively. 3 is provided so as to bypass the hollow portion 3a (see FIG. 8).

  When the size of the gap formed between the main body case 1 and each vane 4a, 4b varies, when each vane 4a, 4b rotates in one direction (clockwise direction in FIG. 8), each vane Although the internal pressures of the two chambers 7a and 7b into which the viscous liquid pressed by 4a and 4b flows are not uniform, in this embodiment as well, the viscous liquid is only between these chambers 7a and 7b. Since the flow path 10 enabling the flow is provided, the viscous liquid flows between the chambers 7a and 7b through the flow path 10 to make the internal pressures of the chambers 7a and 7b uniform. Can do.

  9 and 10 are diagrams illustrating the rotary damper according to the fourth embodiment. In this rotary damper, the flow path 10 is provided in the lid member 2. More specifically, the flow path 10 includes an annular groove 10h formed in the lid member 2 and grooves 10i and 10j that branch from the groove 10h and open into two chambers, respectively. It is provided in a manner that bypasses the portion 3a (see FIGS. 9 and 10).

  When the size of the gap formed between the main body case 1 and the vanes 4a and 4b varies, the viscosity pressed by the vanes 4a and 4b when the vanes 4a and 4b rotate in one direction. Although the internal pressures of the two chambers 7a and 7b into which the liquid flows are not uniform, in the present embodiment as well as the first embodiment, the flow path 10 that allows the viscous liquid to flow only between the chambers 7a and 7b. Since the viscous liquid flows through the flow path 10 between the chambers 7a and 7b, the internal pressure of the chambers 7a and 7b can be made uniform.

  11 and 12 are diagrams illustrating the rotary damper according to the fifth embodiment. In this rotary damper, the flow path 10 is provided in the intermediate member 11. More specifically, the flow path 10 includes an annular groove 10k formed in the intermediate member 11, and holes 10m and 10n branched from the groove 10k and opened to the two chambers 7a and 7b, respectively. 3 is provided so as to bypass the hollow portion 3a (see FIG. 12).

  When the size of the gap formed between the main body case 1 and the vanes 4a and 4b varies, the viscosity pressed by the vanes 4a and 4b when the vanes 4a and 4b rotate in one direction. Although the internal pressures of the two chambers 7a and 7b into which the liquid flows are not uniform, in the present embodiment as well as the first embodiment, the flow path 10 that allows the viscous liquid to flow only between the chambers 7a and 7b. Since the viscous liquid flows through the flow path 10 between the chambers 7a and 7b, the internal pressure of the chambers 7a and 7b can be made uniform.

1 is a plan view illustrating a rotary damper according to Embodiment 1. FIG. 1 is a front view showing a rotary damper according to Embodiment 1. FIG. It is an AA section sectional view in FIG. It is a BB section sectional view in FIG. It is CC sectional view taken on the line in FIG. 6 is a cross-sectional view showing a rotary damper according to Embodiment 2. FIG. FIG. 6 is a cross-sectional view illustrating a rotary damper according to a third embodiment. FIG. 8 is a cross-sectional view taken along a line DD in FIG. 7. FIG. 6 is a cross-sectional view showing a rotary damper according to a fourth embodiment. FIG. 10 is a cross-sectional view taken along a line EE in FIG. 9. FIG. 10 is a cross-sectional view illustrating a rotary damper according to a fifth embodiment. It is the FF section sectional drawing in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case 2 Lid member 3 Shaft member 3a Hollow part 4a, 4b Vane 5a, 5b Partition 6a, 6b, 7a, 7b Chamber 8 Passage 8a Large hole part 8b Small hole part 9 Valve body 10 Flow path 10a-10c, 10e- 10g, 10h to 10k groove 10m, 10n hole 11 intermediate member 12 seal member

Claims (4)

A shaft member provided in the main body case, a viscous liquid filled in the main body case, and a plurality of pressing means provided in the main body case for pressing the viscous liquid by rotating around the shaft member And the viscosity generated when each pressing means rotates in the opposite direction and presses the viscous liquid, rather than the resistance of the viscous liquid that occurs when each pressing means rotates in one direction and presses the viscous liquid. A rotary damper having a control mechanism for reducing the resistance of the liquid,
When each pressing means rotates in one direction, without providing a flow path that allows the viscous liquid to flow between the plurality of chambers that contain the viscous liquid pressed by each pressing means, A rotary damper characterized in that a flow path is provided that allows the viscous liquid to flow only between a plurality of chambers into which the viscous liquid pressed by each pressing means flows.   A lid member having a bottom surface that closes the opening of the main body case and that presses when each pressing means rotates, and the flow path is formed in the main body case, the shaft member, or the lid member. The rotary damper according to claim 1, wherein the rotary damper is provided.   A lid member that closes the opening of the main body case; and an intermediate member that is provided between each pressing means and the lid member and has a bottom surface that is in sliding contact with each pressing means when each pressing means rotates. The rotary damper according to claim 1, wherein the flow path is provided in the intermediate member.   The rotary damper according to claim 1, wherein the shaft member is hollow, and the flow path is provided so as to bypass a hollow portion of the shaft member.

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