JP2013068273A - Finite angle rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a dead stroke by providing fixed parts 13b, 14b of check valves 13, 14 outside partitioned chambers 9a, 9b, 10a, 10b.SOLUTION: Check valves 13, 14 have plate-like valve parts 13a, 14a for opening a fluid path by pressure operation in fluid paths 11, 12 and fixed parts 13b, 14b for fixing the plate-like valve parts. Further, the fixed parts are positioned outside partitioned chambers 9a, 9b, 10a, 10b, the fixed parts 13b, 14b are fixed to a shaft member 2, and when pressure produced by flows from the partitioned chambers 9a, 10a to the partitioned chambers 9b, 10b act to the plate-like vale parts, the plate-like valve parts 13a, 14a are deflected to open the valve. Meantime, when high pressures in the partitioned chambers 9b, 10b which are raised to high pressure when damping force is exerted are acted to the plate-like valve parts 13a, 14a, the plate-like valve parts shut off flows from the partitioned chambers 9b, 10b to the partitioned chambers 9a, 10a, or restrict the flows.

Description

  The present invention relates to a finite angle rotary damper that rotates within a range of a constant angle.

As a finite-angle rotary damper, for example, those disclosed in Patent Literature 1 and Patent Literature 2 are conventionally known.
In the finite angle rotary damper disclosed in Patent Document 1, a shaft member is inserted into a cylindrical casing, and a blade portion is projected from the outer periphery of the shaft member. In addition, a partition wall is provided on the inner periphery of the casing, and a pair of partition chambers are formed between the blade portions and the partition wall.

In addition, a notch that communicates the pair of compartments is provided at the tip of the blade portion, and a valve member that is formed with a recess that covers the notch is provided.
The valve member is configured such that the groove width of the concave portion is larger than the thickness of the blade portion, and the other wall surface is separated from the blade portion when one wall surface of the concave portion is pressed against the blade portion by the pressure action of the compartment. Yes. In addition, a free flow path allowing a free flow of fluid is formed on one wall surface of the valve member in combination with the notch of the blade portion, and a throttle flow path is formed on the other wall surface.

  In the finite angle rotary damper configured as described above, the valve member functions to maintain free rotation when rotated in one direction, and exhibits a damping force when rotated in the other direction. That is, when the damper is rotated in one direction, one wall surface of the valve member is in close contact with the blade portion to open the free flow path, and when the damper is rotated in the other direction, the other wall surface of the valve member is in close contact with the blade portion. Then, the free flow path is closed and the throttle flow path is opened to exert a damping force.

In addition to the finite-angle rotary damper of the type in which the valve member is allowed to straddle the blade portion as described above, the one disclosed in Patent Document 2 is also conventionally known.
In this finite angle rotary damper, a shaft member is inserted into a cylindrical casing, and a pair of blade portions project from the outer periphery of the shaft member. In addition, a pair of partition walls are provided on the inner periphery of the casing, and two sets of partition chambers are formed between the blade portions and the partition walls.

  Then, the thickness of the blade portion is increased, and a fitting groove for fitting the valve member is formed in the thickened blade portion, and a flow passage allowing fluid flow is formed on both wall surfaces constituting the fitting groove. Forming.

  In the finite angle rotary damper configured as described above, the valve member functions to maintain free rotation when rotated in one direction, and exhibits a damping force when rotated in the other direction. That is, when the damper rotates in one direction, the valve member opens the flow path to allow free flow. When the valve member rotates in the other direction, the valve member closes the flow path. At this time, the fluid flows through a slight gap between the tip of the valve member and the arc surface of the casing. Therefore, a damping force is exerted by the flow resistance of the fluid flowing through the slight gap.

Japanese Patent Laid-Open No. 4-282039 JP 2002-364893 A

  In the finite angle rotary damper disclosed in Patent Document 1, since the blade portion is covered with the valve member, when the blade portion makes a full stroke in the direction of the partition wall, the valve member is interposed between the blade portion and the partition wall. The wall surface that constitutes the recess is necessarily interposed. Therefore, the effective rotation stroke of the finite angle rotary damper is reduced by the thickness of the wall surface of the recess. In particular, since the valve member has wall surfaces constituting the recesses on both sides, considering the rotation strokes on both sides in the rotational direction of the damper, the effective rotation stroke is reduced by the thickness of the pair of wall surfaces constituting the recesses. End up.

And although the finite angle rotary damper of the said patent document 1 has only one blade | wing part, when providing several wing | blade parts and providing a valve member in each wing | blade part, it is effective rotation stroke by the number of valve members. However, depending on the application, there is a problem that the reduction of the stroke must be solved by increasing the size of the damper.
Moreover, since the groove width of the concave portion of the valve member must be larger than the thickness of the blade portion, play is formed between the valve member and the blade portion, but the play portion is backlash. As a result, there was a problem that the desired control could not be performed at the beginning of the stroke.

  In the finite-angle rotary damper disclosed in Patent Document 2, since a fitting groove has to be formed at the center of the blade portion, the thickness of the blade portion must be increased. Thus, there has been a problem that the effective rotation stroke of the finite angle rotary damper becomes smaller as the thickness of the blade portion is increased.

  An object of the present invention is to provide a finite angle rotary damper that can take a large effective rotation stroke and has no uncontrollable region due to backlash or the like.

  According to the present invention, a casing, an arc surface formed in the casing, a partition wall provided from the arc surface toward the center of the casing, and the center of the arc surface are rotatably held in the casing. A shaft member, a blade portion projecting from the outer periphery of the shaft member and rotating along the arc surface of the casing, and between the arc surface of the casing and the outer surface of the shaft member, At least two or more compartments partitioned by a partition wall and a blade portion, a fluid passage penetrating either one of the blade portion or the partition wall and having both end openings facing the partition chamber, the blade portion, and Open and close the opening facing one of the compartments partitioned by the partition wall, and from the other partition chamber partitioned by the blade and the partition wall against the flow of the viscous fluid passing through the fluid passage. Up About finite angle rotary damper and a check valve which allows only the flow of the one compartment.

In the first invention, the check valve includes a plate-like valve portion that opens the fluid passage by a pressure action in the fluid passage, and a fixing portion that fixes the plate-like valve portion. Further, the fixing portion is fixed to any of the casing, the shaft member, the partition wall, and the blade portion, and the fixing portion is positioned outside the partition chamber.
When the pressure generated by the flow from the other compartment to the one compartment is applied to the plate-like valve portion, either the plate-like valve portion or the fixed portion or both of them are bent to open the valve. It is configured to do.
Further, when the high pressure of the one compartment, which becomes high when the damping force is exerted, acts on the plate-like valve portion, the plate-like valve portion blocks the flow from one compartment to the other compartment. Or the flow is restricted.

In the second invention, an embedded groove is provided in any of the casing, the shaft member, the partition wall, or the blade portion, and the fixed portion is embedded in the embedded groove.
The outer peripheral surface of the shaft member in the present invention is a peripheral surface along a circumscribed circle circumscribing the outer periphery of the shaft member, and even if the embedded groove is open to the outer periphery of the shaft member, A surface along the inner surface is not included in the outer periphery of the shaft member. Similarly, the inner periphery of the casing is a peripheral surface along an inscribed circle inscribed in the inner periphery of the casing.

  According to a third aspect of the present invention, the check valve is configured to exert an elastic force that presses against the opening portion of the fluid passage in a normal state where no pressure in the valve opening direction acts.

  In a fourth aspect of the present invention, the embedded groove having a depth in the diameter direction is formed in the shaft member or the casing, and the fixing portion is embedded in the embedded groove.

  According to a fifth aspect of the present invention, a retaining protrusion is formed in the embedded groove, and a contact portion that contacts the retaining protrusion is provided in the fixing portion, and a force in the removal direction is applied to the plate-like valve portion. When it acts, the contact portion is configured to contact the retaining protrusion.

  According to the first aspect of the present invention, the valve member is constituted by the plate-like valve portion and the fixed portion, and when the valve member is fixed, the fixed portion is positioned outside the compartment. When a full stroke occurs, only the plate-like valve portion capable of reducing the thickness is interposed between the blade portion and the partition wall, so that the effective rotation stroke can be increased.

  According to the second aspect of the invention, since the embedded groove is provided in any of the casing, the shaft member, the partition wall, or the blade portion, and the fixed portion is embedded in the embedded groove, the fixed portion can be provided without using screws. As a result, the check valve can be easily assembled and the number of parts can be reduced.

  According to the third invention, since the check valve is in pressure contact with the opening portion of the fluid passage in the normal state, almost no backlash occurs. Therefore, it is possible to eliminate the uncontrollable area caused by the backlash.

  According to the fourth invention, since the length from the fixed portion to the tip of the plate-like valve portion can be increased, the plate-like valve portion becomes flexible and resistance to free flow can be reduced.

  According to the fifth aspect of the invention, since the retaining protrusion is provided in the embedded groove, even if a force in the removal direction acts on the check valve, it does not come out of the embedded groove.

It is a front view which shows 1st Embodiment. It is the II-II sectional view taken on the line of FIG. FIG. 3 is an enlarged partial cross-sectional view of a portion A in FIG. 2. It is an expansion perspective view of the state where a check valve was built in the shaft member of a 1st embodiment. FIG. 5 is an enlarged perspective view showing a state in which the check valve is separated from the embedding groove according to the first embodiment, wherein the scale factor is larger than that in FIG. 4. It is sectional drawing of 2nd Embodiment corresponded in FIG. 2 of 1st Embodiment. It is an expanded partial sectional view of the A section of FIG. It is sectional drawing of 3rd Embodiment corresponded in FIG. 2 of 1st Embodiment. It is an expanded partial sectional view of the A section of FIG. It is sectional drawing of 4th Embodiment corresponded in FIG. 2 of 1st Embodiment. It is an expanded partial sectional view of the A section of FIG. It is sectional drawing of 5th Embodiment corresponded in FIG. 2 of 1st Embodiment.

  In the first embodiment shown in FIGS. 1 to 5, a shaft portion 2 a of a shaft member 2 is rotatably incorporated in a cylindrical casing 1. The shaft portion 2 a incorporated in the casing 1 has a shaft portion 2 a. A pair of blade portions 3 and 4 projecting in the radial direction is provided. In the state in which the shaft portion 2a is incorporated in the casing 1 as described above, is the tip of the blade portions 3 and 4 in contact with the arcuate surfaces 1a and 1b formed in the casing 1 as shown in FIG. Or the dimension which rotates with a slight clearance maintained is maintained.

  As shown in FIG. 4, the shaft member 2 configured as described above is provided with a flange portion 5 on the proximal end side of the shaft portion 2 a, and the shaft portion 2 a is configured to protrude from the flange portion 5. Further, the projecting end of the shaft portion 2a is provided with a support projection 2b having a diameter smaller than that of the shaft portion 2a, and the support projection 2b is rotatably supported by a bearing (not shown) provided on the casing 1. Yes. A step is provided at the boundary between the shaft portion 2a and the support projection 2b to form a step portion 2c.

  Further, the shaft member 2 is inserted through an opening provided on one side of the casing 1 so that the support protrusion 2b is supported by a bearing provided on the casing 1, and the opening is covered with a cap 6 shown in FIG. Block. The cap 6 is provided with a bearing portion (not shown), and the shaft member 2 outside the flange portion 5 is rotatably supported by the bearing portion.

  On the other hand, as shown in FIG. 2, a pair of partition walls 7 and 8 projecting in the radial direction are provided on the inner periphery of the casing 1, and the tips of the partition walls 7 and 8 are the outer periphery of the shaft portion 2a. Rotate while touching or maintaining a slight gap. Accordingly, the partition walls 7 and 8 form a pair of partition chambers 9a and 9b and 10a and 10b in combination with the blade portion 4 that contacts the inner periphery of the casing 1 or rotates while maintaining a slight gap.

Further, as shown in FIGS. 4 and 5, the blade portions 3 and 4 are formed with rectangular through holes having long sides in the axial direction of the shaft portion 2 a, and these through holes serve as fluid passages 11 and 12. .
Then, check valves 13 and 14 are provided on side surfaces of the pair of blade portions 3 and 4 that are symmetrical with respect to each other, and the action of the check valves 13 and 14 causes the fluid passages 11 and 12 to be unidirectional. Although only the flow is configured, the specific configurations of the check valves 13 and 14 are as follows.

The check valves 13 and 14 include plate-shaped valve portions 13a and 14a and fixed portions 13b and 14b. The fixed portions 13b and 14b are connected to the base ends of the plate-shaped valve portions 13a and 14a and the base ends. Although the portion is folded in a U shape, the plate-like valve portions 13a and 14a and the fixing portions 13b and 14b are made of an elastic material. In addition, when the strength of the check valves 13 and 14 is required, the check valves 13 and 14 are preferably made of metal.
The fixing portions 13b and 14b are embedded in the embedded grooves 15 and 16. The embedded grooves 15 and 16 have a length in a direction corresponding to the axial direction of the shaft portion 2a and an axial direction of the fixing portions 13b and 14b. The lengths are made substantially equal so that the fixing portions 13b and 14b fit into the embedded grooves 15 and 16 almost exactly.

Further, one side surface of the embedded grooves 15 and 16 is continuous with the side surface of the blade portions 3 and 4, and the other side surface facing the one side surface is between the one side surface and the fixing portions 13b and 14b. At the opening of the embedded grooves 15 and 16 on the other side surface, retaining projections 17 and 18 extending in the axial direction are formed.
The retaining protrusions 17 and 18 are brought into contact with the contact portions 13c and 14c, which are the tips of the fixing portions 13b and 14b embedded in the embedded grooves 15 and 16, and the fixing portions 13b and 14b are embedded in the embedded grooves 15 and 16 respectively. It is for preventing it from coming off.

Also, insertion grooves 19 and 20 extending in the axial direction are formed on the surface of the support protrusion 2b. One end of each of the insertion grooves 19 and 20 is opened to the front end of the support protrusion 2b, and the other end of the support protrusion 2b. It is made to continue to the embedding grooves 15 and 16 opened to the step part 2c.
The reason why the insertion grooves 19 and 20 that are continuous with the embedded grooves 15 and 16 are formed as described above is to make it easier to perform die cutting during molding.

That is, the blade portions 3 and 4 narrow the cross-sectional width of FIG. 2 toward the shaft portion 2a. However, when the blade portions 3 and 4 have such a shape, the mold for forming the embedded grooves 15 and 16 is formed as shown in FIG. It is difficult to remove in the diameter direction. Therefore, by making the insertion grooves 19 and 20 continuous with the embedded grooves 15 and 16 as described above, the mold for forming the embedded grooves 15 and 16 and the insertion grooves 19 and 20 can be removed in the axial direction. . Further, by doing so, the retaining projections 17 and 18 can also be molded.
In addition, it can also shape | mold using the type | mold which divided the shaft member 2 into the radial direction by shape | molding in the part of the embedding grooves 15 and 16 using another piece. Therefore, when such a molding direction is used, the insertion grooves 19 and 20 are not necessarily required. In this case, however, the retaining projections 17 and 18 must be formed of separate members and attached to the shaft member 2 with screws or the like.

When the check valves 13 and 14 are assembled to the shaft member 2, the U-shaped fixing portions 13b and 14b are slid along the insertion grooves 19 and 20 while being slightly bent, and the contact portions 13c and 14c are prevented from being removed. It pushes into the embedding grooves 15 and 16 so as to enter the inside of the projecting protrusions 17 and 18.
In this way, the U-shaped fixing portions 13b and 14b generate a force to elastically open in the embedded grooves 15 and 16, and the plate-like valve portions 13a and 14a are impellers by the action of the force. It adheres to parts 3 and 4.

  Then, by embedding the fixing portions 13b and 14b in the embedding grooves 15 and 16, the fixing portions 13b and 14b can be positioned outside the compartments 9a, 9b and 10a, 10b. The compartments 9a, 9b and 10a, 10b are between the arcuate surfaces 1a, 1b of the casing 1 and the outer peripheral surface of the shaft member 2, and the compartment walls 7, 8 and the blade portions 3, 4 The arc surfaces 1a and 1b of the casing 1 are arc surfaces on an inscribed circle inscribed in the inner periphery of the casing 1, and the outer peripheral surface of the shaft member 2 is the shaft member. An arc surface on a circumscribed circle that circumscribes the outer periphery. In the present invention, even if the embedded grooves 15 and 16 are open on the outer periphery of the shaft member 2, a portion along the inner surface of the embedded grooves 15 and 16. Is not included in the outer periphery of the shaft member 2.

  The fluid passages 11 and 12 are biased toward the support protrusion 2b side, that is, the casing 1 side with reference to the center of the plate-like valve portions 13a and 14a in the direction corresponding to the axial direction of the shaft member 2, so that the plate shape The opening area of the fluid passages 11 and 12 on the support protrusion 2b side, that is, on the casing 1 side from the center of the valve parts 13a and 14a is set to be larger than the opening area on the opposite side of the center of the plate-like valve parts 13a and 14a. Is also relatively large.

  The reason why the opening areas of the fluid passages 11 and 12 are relatively large on the support protrusion 2b side, that is, the casing 1 side is that the check valves 13 and 14 receive pressure from the fluid passages 11 and 12 and the casing This is to prevent the casing 1 from being damaged by the check valves 13 and 14 so as not to shift to the first side.

  For example, if the centers of the fluid passages 11 and 12 in the axial direction coincide with the centers of the plate-like valve portions 13a and 14a in the axial direction, in other words, the openings of the fluid passages 11 and 12 with the center as a boundary. If the areas are made equal, the check valves 13 and 14 will move in either of the axial directions when the pressure balance is broken even a little. If the metal check valves 13 and 14 move to the casing 1 side, the check valves 13 and 14 and a bearing (not shown) that supports the casing 1 and the support protrusion 2b rub against each other, and the casing 1 and the bearing are moved. May cause damage.

  However, if the opening areas of the fluid passages 11 and 12 on the casing 1 side are relatively large as described above, the check valves 13 and 14 receive a large amount of force in the direction away from the casing 1, and the check valve 13 , 14 are difficult to move to the casing 1 side. Therefore, the casing 1 is hardly damaged by the check valves 13 and 14.

In FIG. 2, when the shaft member 2 rotates in the counterclockwise direction relative to the casing 1, the finite angle rotary damper of the first embodiment reduces the volume of the compartments 9a and 10a. , 10b expands, and the pressure of the viscous fluid in the compartments 9a, 10a increases.
Therefore, the pressure of the viscous fluid in the compartments 9 a and 10 a acts on the plate-like valve portions 13 a and 14 a of the check valves 13 and 14 through the fluid passages 11 and 12. If a high pressure acts on the plate-like valve portions 13a and 14a in this way, the plate-like valve portions 13a and 14a bend and open the fluid passages 11 and 12, and the viscous fluid in the compartments 9a and 10a enters the compartments 9b and 10b. Flow and free rotation of the shaft member 2 are allowed.

  When the shaft member 2 rotates clockwise, which is the opposite direction to the above, the volume of the compartments 9b and 10b is reduced, the volume of the compartments 9a and 10a is enlarged, and the viscous fluid in the compartments 9b and 10b is increased. Pressure increases. Accordingly, the pressure of the viscous fluid in the compartments 9b and 10b acts on the plate-like valve portions 13a and 14a of the check valves 13 and 14, but at this time, the plate-like valve portions 13a and 14a are in close contact with the blade portions 3 and 4. Only the fluid passages 11 and 12 are kept closed.

  In the state where the fluid passages 11 and 12 are closed as described above, the high-viscosity viscous fluid causes gaps in contact portions between the arcuate surfaces 1a and 1b of the casing 1 and the blade portions 3 and 4 and the outer periphery of the shaft portion 2a. It flows through the gap between the contact portions of the section and the partition walls 7 and 8 and flows to the opposite partition chambers 9a and 10a, but a damping force is exhibited by the flow resistance at this time.

When the shaft member 2 makes a full stroke in the clockwise direction as described above, the plate-like valve portions 13a and 14a are interposed between the blade portions 3 and 4 and the partition walls 7 and 8, but the fixed portion as described above. Since 13b and 14b are embedded in the embedding grooves 15 and 16 and are located outside the compartments 9a and 9b and 10a and 10b, there is almost no conventional dead stroke.
Further, the plate-like valve portions 13a and 14a are in close contact with the blade portions 3 and 4 in combination with the elastic force of the fixing portions 13b and 14b in a normal state where no pressure acts on the plate-like valve portions 13a and 14a. . Therefore, it is possible to eliminate the uncontrollable area caused by the backlash.

  Further, the retaining grooves 17 and 18 are provided in the embedded grooves 15 and 16 so that the contact protrusions 17 and 18 of the check valves 13 and 14 come into contact with the retaining protrusions 17 and 18. Even if a force is applied to the check valves 13 and 14 so that the check valves 13 and 14 are removed from the embedded grooves 15 and 16, the check valves 13 and 14 do not come out of the embedded grooves 15 and 16.

Further, since the embedded grooves 15 and 16 are provided in the shaft member 2a, and the fixing portions 13b and 14b are embedded in the embedded grooves 15 and 16, the fixing portion can be fixed without using screws or the like. The assembly work of the check valves 13 and 14 is simplified and the number of parts can be reduced.
In addition, since the length from the fixed portions 13b and 14b to the tips of the plate-like valve portions 13a and 14a can be increased, the plate-like valve portions 13a and 14a are easily bent and resistance to free flow can be reduced.

In the second embodiment shown in FIGS. 6 and 7, fluid passages 21 and 22 are formed in the partition walls 7 and 8 in place of the fluid passages 11 and 12 and the embedding grooves 15 and 16 of the first embodiment, and the casing. 1 are formed in the arcuate surfaces 1a, 1b of the first embodiment, and the recessed grooves 23, 24 are provided in the embedded grooves, and the protruding protrusions 25, 26 are provided in the embedded grooves. The relative relationship between the fluid passages 13 and 14 and the fluid passages 11 and 12 is the same as that in the first embodiment.
Therefore, the detailed description of the same components as those of the first embodiment is omitted, and the same reference numerals as those of the first embodiment are used for the same components.

  In the second embodiment, the compartments 9a, 9b and 10a, 10b are located between the arcuate surfaces 1a, 1b of the casing 1 and the outer peripheral surface of the shaft member 2, and the compartment walls 7, 8 The outer peripheral surface of the shaft member 2 is a circumscribed circle on the circumscribed circle that circumscribes the outer periphery of the shaft member, and the arc surfaces 1a and 1b of the casing 1 Is a circumferential surface on an inscribed circle inscribed in the arcuate surfaces 1a and 1b of the casing 1. Even if the embedding grooves 23 and 24 are open in the arcuate surfaces 1a and 1b of the casing 1, they are embedded in the present invention. The portions along the inner surfaces of the grooves 23 and 24 are not included in the inner periphery of the casing 1.

As described above, also in the second embodiment, when the shaft member 2 has a full stroke, the plate-like valve portions 13a and 14a are interposed between the blade portions 3 and 4 and the partition walls 7 and 8, but the fixed portion 13b and Since 14b is embedded in the embedding grooves 23 and 24 and is located outside the compartments 9a and 9b and 10a and 10b, there is almost no dead stroke.
Further, since the plate-like valve portions 13a and 14a are in a normal state in which no pressure is applied thereto and are in close contact with the partition walls 7 and 8 coupled with the elastic force of the fixing portions 13b and 14b, so-called backlash is eliminated.

  Further, the retaining grooves 25 and 26 are provided in the embedded grooves 23 and 24, and the contact protrusions 25 and 26 of the check valves 13 and 14 come into contact with the retaining protrusions 25 and 26. Even if a force is applied to the check valves 13 and 14 in the direction in which the check valves 13 and 14 are removed from the embedded grooves 25 and 26, the check valves 13 and 14 are not released from the embedded grooves 25 and 26.

Moreover, since the embedded grooves 23 and 24 are provided in the casing 1 and the fixing portions 13b and 14b are embedded in the embedded grooves 23 and 24, the fixing portion can be fixed without using screws or the like. The assembly work of the valves 13 and 14 is simplified and the number of parts can be reduced.
In addition, since the length from the fixed portions 13b and 14b to the tips of the plate-like valve portions 13a and 14a can be increased, the plate-like valve portions 13a and 14a are easily bent and resistance to free flow can be reduced.

  The third embodiment shown in FIGS. 8 and 9 differs from the first and second embodiments in the configuration of the check valves 27 and 28. That is, in the check valves 27 and 28 of the third embodiment, the fixed portions 27b and 28b provided at the base portions of the plate-like valve portions 27a and 28a are formed in a bowl shape as shown in the figure, and the blade portions 3 and 4 are formed. It is embedded directly in the base. That is, in the third embodiment, the fixing portions 27b and 28b are directly embedded in the base portions of the blade portions 3 and 4 without forming embedded grooves as in the first and second embodiments.

  And also in this 3rd Embodiment, when the shaft member 2 makes a full stroke, the plate-like valve portions 27a and 28a are interposed between the blade portions 3 and 4 and the partition walls 7 and 8, but the fixed portions 27b and 28b are Since it is directly embedded in the bases of the blade portions 3 and 4 and is located outside the compartments 9a and 9b and 10a and 10b, there is almost no dead stroke.

Further, the plate-like valve portions 27a and 28a are in close contact with the partition walls 7 and 8 in combination with the elastic force of the fixing portions 27b and 28b in a normal state where no pressure acts on the plate-like valve portions 27a and 28a. .
Further, since the fixing portions 27b and 28b are directly embedded in the base portions, the check valves 27 and 28 do not come out even if a force in the direction of coming off is applied to the check valves 27 and 28.

In the fourth embodiment shown in FIGS. 10 and 11, fluid passages 21 and 22 are formed in the partition walls 7 and 8 in place of the fluid passages 11 and 12 of the third embodiment. Other configurations including the relationship with the fluid passages 21 and 22 are the same as those in the first embodiment.
Therefore, the detailed description of the same components as those of the third embodiment is omitted, and the same reference numerals as those of the third embodiment are used for the same components.

  As shown in the figure, the check valves 27 and 28 of the fourth embodiment are formed in a bowl shape with fixing portions 27b and 28b provided at the base portions of the plate-like valve portions 27a and 28a, and the base portions of the partition walls 7 and 8 are formed. Directly embedded in

  And also in this 4th Embodiment, when the shaft member 2 makes a full stroke, the plate-like valve portions 27a and 28a are interposed between the blade portions 3 and 4 and the partition walls 7 and 8, but the fixed portions 27b and 28b are Since it is directly embedded in the bases of the blade portions 3 and 4 and is located outside the compartments 9a and 9b and 10a and 10b, there is almost no dead stroke.

Further, the plate-like valve portions 27a and 28a are in close contact with the partition walls 7 and 8 in combination with the elastic force of the fixing portions 27b and 28b in a normal state where no pressure acts on the plate-like valve portions 27a and 28a. .
Further, since the fixing portions 27b and 28b are directly embedded in the base portions of the partition walls 7 and 8, even if a force in the direction of escaping is applied to the check valves 27 and 28, it does not come out.

  In the fifth embodiment shown in FIG. 12, the cross-sectional shape of the casing 28 in the direction orthogonal to the axis is a sector shape. That is, in the fifth embodiment, the arc surface a is formed on the inner periphery of the casing 28, and wall surfaces extending from the arc surface a toward the center thereof are formed at both ends of the arc surface a. 29 and 30.

  Further, the shaft portion 31a of the shaft member 31 is rotatably held at the center portion of the casing 28, and the blade portion 32 similar to that of the first embodiment is formed on the shaft portion 31a. Furthermore, in a state where the shaft portion 31a is assembled in the casing 28 as shown in FIG. 12, the blade portion 32 is dimensioned so that the tip thereof contacts the arcuate surface a of the casing 28 or rotates with a slight clearance. Keep. The arcuate surface a is aligned with the center of the arc and the rotation center of the shaft member 2, and the vane portion 32 and the partition walls 29 and 30 are combined to form the compartments 33 and 34 in the casing 28. Is partitioned.

Further, the check valve 35 is also assembled in the fifth embodiment. The check valve 35 includes a plate-like valve portion 35a and a fixing portion 35b, and the fixing portion 35b of the check valve 35 is connected to the shaft portion 31a. It is embedded in the embedded groove 36 formed along the axis. The function of the check valve 35 is exactly the same as in the first embodiment.
In the figure, reference numeral 37 denotes a retaining protrusion, which exhibits the same function as in the first embodiment.

  A fluid passage 38 is formed in the blade 32, and the fluid passage 38 maintains the same positional relationship as in the first embodiment. That is, with respect to the check valve 35 incorporated in the shaft member 31, the fluid passage 38 is not shown with reference to the center of the plate-like valve portion 35 a in the direction corresponding to the axial direction of the shaft portion 31 a. It is biased toward the protrusion side, that is, the casing 28 side. In other words, the fluid passage 38 is biased toward the support protrusion 2b with reference to the center of the plate valve portion 35a in the direction corresponding to the axial direction.

Since the fluid passage 38 is biased with respect to the center of the plate-like valve portion 35a as described above, the opening area of the fluid passage 38 on the casing 28 side of the center is the boundary of the plate-like valve portion 35a. The opening area on the opposite side is relatively larger.
The reason why the opening area of the fluid passage 38 is relatively increased on the casing 28 side is that the check valve 35 receives pressure from the fluid passage 38 and does not shift to the casing 28 side. These points are the same as in the first embodiment so as not to damage the casing 28.

  It is effective as a finite angle rotary damper that controls the opening and closing of the toilet lid.

DESCRIPTION OF SYMBOLS 1 Casing 1a, 1b Arc surface 2 Shaft member 3, 4 Blade | wing part 7, 8 Compartment wall 9a, 9b Compartment chamber 10a, 10b Compartment chamber 11, 12 Fluid passage 13, 14 Check valve 13a, 14a Plate-shaped valve part 13b, 14b Fixed portions 15, 16 Embedded grooves 17, 18 Detent projections 21, 22 Fluid passages 23, 24 Embedded grooves 25, 26 Detent projections 27, 28 Check valves 27a, 28a Plate-shaped valve portions 27b, 28b Fixed portions 28 Casing a Arc surface 29, 30 Partition wall 31 Shaft member 31a Shaft portion 32 Blade portion 33, 34 Compartment chamber 35 Check valve 35a Plate-like valve portion 35b Fixed portion 36 Embedded groove 38 Fluid passage

Claims (5)

  A casing, an arc surface formed in the casing, a partition wall provided from the arc surface toward the center of the casing, and a shaft member rotatably held in the casing with the center of the arc surface as a rotation center A blade portion protruding from the outer periphery of the shaft member and rotating along the arc surface of the casing; and between the arc surface of the casing and the outer surface of the shaft member, the partition wall and the blade At least two or more compartments partitioned by the section, a fluid passage penetrating either one of the blades or the partition wall and having both end openings facing the partition chamber, and partitioning by the blades and the partition wall Open and close the opening facing one of the compartments, and with respect to the flow of the viscous fluid passing through the fluid passage, the one compartment from the other compartment partitioned by the blade portion and the partition wall. In a finite angle rotary damper equipped with a check valve that allows only flow to the plate, the check valve is a plate-like valve portion that opens the fluid passage by the action of pressure in the fluid passage, and the plate-like valve portion is fixed. And fixing the fixed part to any one of the casing, the shaft member, the partition wall, and the blade part, and to the plate-like valve part to the other When pressure generated by the flow from one compartment to the other compartment is applied, either the plate-like valve portion or the fixed portion or both of them are bent and opened while a damping force is exerted A configuration in which when the high pressure of the one compartment, which is high pressure, acts on the plate-like valve portion, the plate-like valve portion blocks or restricts the flow from one compartment to the other compartment. Finite Rotary damper.   The finite angle rotary damper according to claim 1, wherein an embedded groove is provided in any of the casing, the shaft member, the partition wall, and the blade portion, and the fixed portion is embedded in the embedded groove.   3. The finite angle rotary damper according to claim 1, wherein the check valve is configured to exhibit an elastic force that presses against an opening portion of the fluid passage in a normal state in which no pressure in the valve opening direction is applied.   The finite angle rotary damper according to any one of claims 1 to 3, wherein the embedded groove having a depth in the diameter direction is formed in the shaft member or the casing, and the fixing portion is embedded in the embedded groove.   A retaining protrusion is formed in the embedded groove, and an abutting portion that contacts the retaining protrusion is provided on the fixing portion, and when a force in the removal direction acts on the plate-shaped valve portion, The finite angle rotary damper according to any one of 1 to 4, wherein the contact portion is configured to contact the above-described protrusion for retaining.

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