JP2012197863A - Rotary damper - Google Patents

Abstract

The present invention provides a rotary damper that can be reduced in size while exhibiting sufficient damping force.
The problem-solving means of the present invention includes a shaft 1, a plurality of vanes 2 provided on an outer periphery of the shaft 1, and a shaft 12 that supports the shaft 12 while allowing rotation in the circumferential direction, and the vane 2 is provided inside. A casing 3 to be accommodated, a plurality of partition members 4 provided in the casing 3 and disposed between the vanes 2 and 2 of the shaft 1, and a space L formed in the casing 3 and between the partition members 4 In a rotary damper D having a first chamber R1 and a second chamber R2 formed by partitioning the first and second chambers R2 and R2 through a compensation passage 5 that provides resistance to the flow of liquid, communicates with at least one of the first chamber R1 and the second chamber R2. The temperature compensation chamber R is provided in an arbitrary partition wall member 4, and an accumulator 6 in which a gas is sealed is accommodated in the temperature compensation chamber R.
[Selection] Figure 2

Description

  The present invention relates to an improvement of a rotary damper.

  Conventionally, in a rotary damper, a shaft, a plurality of vanes provided on the outer periphery of the shaft, a pair of side panels that support the shaft while allowing rotation in the circumferential direction, and the side panels are sandwiched between these side panels. A case member that houses the vane inside, a plurality of partition members that are provided on the inner periphery of the case member and are in sliding contact with the outer periphery of the shaft between the vanes, and are formed in the case member between these partition members. One chamber and the other chamber formed by partitioning the space with vanes, and an attenuation passage that communicates the one chamber and the other chamber.

  Then, for example, when a rotational force is applied to the shaft from the outside, the rotary damper operates to reduce the one chamber while the vane moves in the pressure chamber with the rotation of the shaft, and expands the other chamber. A damping force that suppresses the rotation of the shaft is exerted by applying resistance to the flow of oil moving from the one chamber to the other chamber through a damping passage.

  As described above, the rotary damper employs a structure in which the shaft rotates and the vane expands / contracts the one chamber and the other chamber. Unlike a dynamic damper, no reservoir or air chamber is required to compensate for operation. However, since the rotary damper attenuates the vibration of the connected device by converting the kinetic energy that swings the shaft into thermal energy, the oil temperature rises and the oil volume changes when the shaft swings continuously. . Therefore, in order to compensate for the volume change of the oil, the rotary damper is provided with a temperature compensation chamber for compensating the oil temperature on the side of the case member. A free piston is slidably inserted into the temperature compensation chamber, the temperature compensation chamber is divided into an oil chamber and an air chamber, and the oil chamber is connected to an attenuation passage that connects the one chamber and the other chamber. (See Patent Document 1).

JP-A-11-82593

  In such a rotary damper, a temperature compensation chamber must be provided on the side of the case member, and the rotary damper becomes large. Further, since the free piston is slidably inserted in the inner periphery of the temperature compensation chamber, there is a problem that the inner peripheral surface must be finished smoothly and the processing cost is increased.

  Dislike this, for example, as disclosed in Japanese Utility Model Laid-Open No. 3-110229, a volume of gas in the rubber bag is accommodated by accommodating a rubber bag in which gas is sealed inside one chamber or the other chamber. There is also an attempt to compensate for the above temperature. In this rotary damper, the temperature compensation chamber is eliminated, so that the rotary damper can be reduced in size. However, since the pressure in one chamber or the other chamber acts directly on the rubber bag, the gas is sealed in the rubber bag. If the pressure is not set to a very high pressure, new problems such as insufficient damping force of the rotary damper and deterioration of responsiveness of generating damping force occur.

  Accordingly, the present invention has been developed to improve the above-described problems, and an object of the present invention is to provide a rotary damper that can be reduced in size while exhibiting sufficient damping force. That is.

  In order to solve the above-described problems, the problem-solving means of the present invention includes a shaft, a plurality of vanes provided on the outer periphery of the shaft, and supports the shaft while allowing the shaft to rotate in the circumferential direction. A casing for accommodating the vanes; a plurality of partition members provided in the casing and disposed between the vanes of the shaft; and a space formed in the casing and between the partition members. In the rotary damper having one chamber and the other chamber formed by partitioning with each other, an arbitrary temperature compensation chamber communicated with at least one of the one chamber and the other chamber through a compensation passage that provides resistance to the flow of liquid. And an accumulator in which gas is sealed is housed in the temperature compensation chamber.

  According to the rotary damper of the present invention, it is possible to reduce the size while exhibiting a sufficient damping force.

It is a cross-sectional view of the rotary damper in one embodiment. It is AA longitudinal cross-sectional view of the rotary damper in one Embodiment. It is a perspective view of the partition member in the rotary damper of one embodiment.

  The present invention will be described below based on the embodiments shown in the drawings. As shown in FIGS. 1 and 2, a rotary damper D according to an embodiment includes a shaft 1, two vanes 2 provided on the outer periphery of the shaft 1, and a shaft while allowing the shaft 1 to rotate in the circumferential direction. A casing 3 that supports and accommodates each vane 2 therein, two partition members 4 provided in the casing 3 and disposed between the vanes 2 and 2 of the shaft 1, and in the casing 3, the partition walls Compensation is provided in one chamber R1 and the other chamber R2 formed by partitioning the space L formed between the members 4 and 4 by the vane 2, and at least one of the one chamber R1 and the other chamber R2 provided in each partition member 4. A temperature compensation chamber R communicated via a passage 5 and an accumulator 6 that is accommodated in the temperature compensation chamber R and in which a gas is enclosed are configured. The rotary damper D exhibits a damping force that suppresses the rotation of the shaft 1 when the shaft 1 is rotated in the circumferential direction with respect to the casing 3.

  Hereinafter, each part of the rotary damper D will be described in detail. First, the shaft 1 includes a serration 1a that is provided at the tip and can be connected to a joint or the like (not shown), an enlarged diameter portion 1b that is larger in diameter than other portions provided in the middle, and an outer periphery of the enlarged diameter portion 1b And the two vanes 2 and 2 provided with a phase of 180 degrees in the circumferential direction, and opened from the side portion between the vanes 2 and 2 of the enlarged diameter portion 1b and communicated between the opposite vanes 2 and 2 and each other. Two communication holes 7 and 8 that do not cross in the axial direction are provided. In addition, in the place mentioned above, although the serration 1a is provided for the connection to the coupling etc. outside a figure, it is not limited to this.

  As will be described in detail later, the casing 3 includes a cylindrical case main body 9 and side panels 10 and 11 that are stacked and fixed on the case main body 9 in FIG. The vanes 2 and 2 are accommodated in the casing 3 so as to be rotatably supported by the side panels 10 and 11.

  The vane 2 has an arcuate surface at the tip, and slides on the upper end in FIG. 2 that contacts the side panel 10 in the casing 3, the tip that contacts the inner surface of the case body 9 in the casing 3, and the side panel 11 in the casing 3. A U-shaped seal 12 is attached to the lower end in FIG. 2, which is in contact with the vane 2 and the casing 3 in sliding contact with the case body 9 and the side panels 10 and 11 of the casing 3. is doing.

  The case body 9 has a cylindrical shape, and includes a plurality of screw holes 9a provided at intervals at the upper end in FIG. 2, and a plurality of screw holes 9b provided at intervals at the lower end in FIG. Configured.

  Further, as shown in FIG. 1, two concave portions 9c and 9c are provided on the inner periphery of the case body 9 with a phase of 180 degrees in the circumferential direction. Each of the concave portions 9c and 9c has a partition member. 4 is fitted.

  In the case of this embodiment, the side panel 10 has a cylindrical shaft holding portion 10a through which the upper end of the shaft 1 in FIG. 2 is inserted, and a flange-like cap portion provided on the outer periphery of the lower end of the shaft holding portion 10a in FIG. 10b and a plurality of bolt insertion holes 10c provided in the cap portion 10b at intervals on the same circumference. Further, on the inner periphery of the shaft holding portion 10a, a cylindrical bearing 16 that is in sliding contact with the upper side of the shaft 1 in FIG. 2, an annular seal member 17 that seals the outer periphery of the shaft 1, and a dust seal 18 are mounted. The side panel 10 is laminated above the case main body 9 in FIG. 2, and these are integrated by screwing the bolt 21 that has passed through the bolt insertion hole 10c into the screw hole 9a. In addition, what is necessary is just to use the number requested | required on intensity | strength for the bolt 21, and what is necessary is just to provide the bolt insertion hole 10c and screw hole 9a of the number corresponding to the number of the bolts 21.

  In the case of this embodiment, the other side panel 11 has a bottomed cylindrical shape, and is provided on the shaft holding portion 11a into which the lower end of the shaft 1 in FIG. 2 is inserted, and on the outer periphery of the upper end of the shaft holding portion 11a in FIG. And a plurality of bolt insertion holes 11c provided at intervals on the same circumference in the cap portion 11b. Further, a cylindrical bearing 19 that is in sliding contact with the outer periphery of the lower end in FIG. 2 of the shaft 1 and an annular seal member 20 that seals the outer periphery of the shaft 1 are mounted on the inner periphery of the shaft holding portion 11a. The side panel 11 is laminated below the case main body 9 in FIG. 2, and these are integrated by screwing a bolt 22 passed through the bolt insertion hole 11c into the screw hole 9b. In addition, what is necessary is just to use the number requested | required on intensity | strength for the volt | bolt 22, and what is necessary is just to provide the bolt insertion hole 11c and screw hole 9b of the number corresponding to the number of the volt | bolts 22. FIG.

  As shown in FIGS. 1 to 3, the partition wall member 4 has a box shape, and corresponds to the bottom surface of the enlarged diameter portion 1 b of the shaft 1 and is opposed to the vanes 2 and 2. 4a, two side walls 4b, 4c extending from both ends in the circumferential direction of the shaft facing wall 4a and being fitted and fixed to the recess 9c of the case body 9, and the shaft facing wall 4a and the side walls 4b, 4c. An upper wall 4d and a lower wall 4e are provided, and a compensation passage 5 is provided on the side wall 4c. Further, a recess 4f is formed from the upper wall 4d to the shaft facing wall 4a and the lower wall 4e. The recess 4f contacts the shaft 1 and the side panels 10 and 11 and seals them. A seal 13 is attached. The shaft facing wall 4 a may be slidably contacted between the vanes 2 and 2 on the outer periphery of the enlarged diameter portion 1 b of the shaft 1.

  A side panel 10 is laminated above the case body 9 in FIG. 2, and a side panel 11 is laminated below the case body 9 in FIG. 2, and the shaft 1 is connected to the case body 9, the side panel 10, When these are integrated while being inserted through 11, the inside of the casing 3 is sealed. Further, two fan-shaped spaces L are formed in the casing 3 by the partition members 4 and 4 disposed between the vanes 2 and 2 of the shaft 1. Furthermore, the space L is partitioned into a first chamber R1 and a second chamber R2 by a vane 2 provided on the shaft 1, and for example, a liquid such as hydraulic oil is enclosed therein.

  Specifically, in FIG. 1, the one chamber R1 is partitioned on the left side of the vane 2 when viewed from the axis of the shaft 1, and the other chamber R2 is partitioned on the right side of the vane 2 when viewed from the axis of the shaft 1. When the shaft 1 rotates clockwise in FIG. 1, each one chamber R1 is enlarged and each other chamber R2 is reduced by the vane 2, and conversely, the shaft 1 is counterclockwise in FIG. When rotating, each one chamber R1 is contracted by the vane 2 and each other chamber R2 is expanded.

  The chambers R1 whose volumes are both expanded or reduced with the rotation of the shaft 1 are communicated with each other by the communication holes 7 of the shaft 1, and similarly, the volumes whose volumes are both expanded or reduced with the rotation of the shaft 1 are communicated. The chambers R2 communicate with each other through the communication hole 8 of the shaft 1. Further, the opening position of the communication hole 7 is provided at the root of the vane 2 so that the one chamber R1 is maintained in the communication state by the communication hole 7 even when the shaft 1 rotates. The other chamber R2 is provided at the base of the vane 2 so that the other chambers R2 are maintained in communication with each other even if the shaft 1 rotates.

  One vane 2 is provided with one attenuation passage 14 that communicates one chamber R1 and the other chamber R2, and the other vane 2 also communicates one chamber R1 and the other chamber R2 with the other attenuation. A passage 15 is provided.

  The one damping passage 14 allows a flow path 14a communicating between the one chamber R1 and the other chamber R2, and a damping valve 14b that allows only a flow of liquid from the one chamber R1 to the other chamber R2 and provides resistance to the flow. And is configured. The other damping passage 15 includes a flow path 15a that communicates the other chamber R2 and the one chamber R1, and a damping valve 15b that allows only the flow of liquid from the other chamber R2 to the one chamber R1 and provides resistance to this flow. It is prepared for.

  Therefore, when the shaft 1 rotates clockwise and the vane 2 compresses the other chamber R2, the hydraulic oil pushed out from the other chamber R2 passes through the damping valve 15b and expands through the other damping passage 15 to the one chamber R1. The damping valve 15b gives resistance to the flow of the hydraulic oil, thereby creating a differential pressure between the other chamber R2 and the one chamber R1, and exhibiting a damping force that suppresses the rotation of the shaft 1. To do.

  On the other hand, when the shaft 1 rotates counterclockwise and the vane 2 compresses the one chamber R1, the hydraulic oil pushed out from the one chamber R1 passes through the damping valve 14b and expands through the one damping passage 14 in the other chamber R2. The damping valve 14b gives resistance to the flow of the hydraulic oil, so that a differential pressure is generated in the one chamber R1 and the other chamber R2, and a damping force that suppresses the rotation of the shaft 1 is generated. Demonstrate.

  In this embodiment, the resistance that the damping valve 14b in the one attenuation passage 14 gives to the liquid flow is set to be larger than the resistance that the damping valve 15b in the other damping passage 15 gives to the liquid flow. Therefore, the pressure in one chamber R1 when the shaft 1 rotates counterclockwise to compress the one chamber R1 is compared with the pressure in the other chamber R2 when the shaft 1 rotates clockwise to compress the other chamber R2. Then, if the rotational speed of the shaft 1 is the same, the pressure in the one chamber R1 is higher than the pressure in the other chamber R2.

  For example, a leaf valve, a poppet valve or a throttle valve can be used as the damping valves 14b and 15b. The resistance given to the liquid flow by the damping valve 14b in the damping passage 14 is the damping in the other damping passage 15. In order to make it larger than the resistance that the valve 15b gives to the flow of the liquid, the valve opening and flow area of the damping valve 14b may be set to be smaller than that of the damping valve 15b.

  The temperature compensation chamber R is formed in the partition member 4 and communicates with the other chamber R2 through a compensation passage 5 provided in the side wall 4c facing the other chamber R2. And in this partition member 4, the accumulator 6 by which gas was enclosed with the predetermined pressure inside is accommodated. Inside the temperature compensation chamber R and outside the accumulator 6, a liquid similar to the liquid filled in the one chamber R1 and the other chamber R2 is filled into a liquid chamber 23.

  Specifically, the compensation passage 5 is configured to include a resistance element that provides resistance to the flow of liquid passing therethrough, such as an orifice, a choke, or another valve. In the present embodiment, the compensation passage 5 is a passage provided with an orifice. ing. Note that a minute gap may be provided in the fitting portion between the partition member 4 and the recess 9c of the case body 9, and this may be used as the compensation passage 5, and the upper wall 4d and the lower wall 4e of the partition member 4 may be used. One or both may be eliminated, and the gap between the side panels 10 and 11 and the side walls 4b and 4c of the partition wall member may be used as the compensation passage 5.

  The accumulator 6 is made of a flexible material, and has a bag shape so that the gas sealed inside does not flow out. Since the internal gas is compressed when the pressure in the temperature compensation chamber R increases, the accumulator 6 increases the volume of the liquid chamber 23 in the temperature compensation chamber R, and conversely, the pressure in the temperature compensation chamber R increases. When it decreases, the internal gas expands and expands to reduce the volume of the liquid chamber 23 in the temperature compensation chamber R.

  Therefore, in the rotary damper D, when the liquid temperature rises and the volume of the liquid increases, the liquid becomes excessive in the one chamber R1 and the other chamber R2, but the accumulator 6 is commensurate with the excess liquid volume and has an excessive amount. The liquid is absorbed in the temperature compensation chamber R through the compensation passage 5 described above. On the other hand, when the liquid temperature decreases and the volume of the liquid decreases, the liquid becomes insufficient in the one chamber R1 and the other chamber R2, but the accumulator 6 swells in accordance with the insufficient liquid volume, and in the one chamber R1 and the other chamber R2. Insufficient liquid is supplied from the temperature compensation chamber R through the compensation passage 5 into the chamber R2.

  As described above, in the rotary damper D, the temperature compensation chamber R is provided in the partition wall member 4 and the accumulator 6 in which gas is sealed is accommodated in the temperature compensation chamber R. Therefore, the temperature compensation chamber R Is not provided on the side of the casing 3, and the entire rotary damper D is reduced in size.

  Further, the accumulator 6 is accommodated in the partition wall member 4 and the temperature compensation chamber R communicates with one or both of the one chamber R1 and the other chamber R2 via the compensation passage 5, so that the rotary damper D The pressures in the one chamber R1 and the other chamber R2, which are high pressures during operation, are not directly propagated into the temperature compensation chamber R. Therefore, the pressure in the temperature compensation chamber R does not prevent the pressure increase in the one chamber R1 and the other chamber R2 during the operation of the rotary damper D. As a result, it is not necessary to keep the pressure always higher than the pressure in the temperature compensation chamber R, the gas filling pressure in the accumulator 6 does not have to be set very high, and the rotary damper D exhibits a sufficient damping force. Therefore, the responsiveness of generating the damping force is not deteriorated. From the above, according to the rotary damper D of the present invention, it is possible to reduce the size while exhibiting a sufficient damping force.

  Furthermore, since there is no need to provide a free piston in the temperature compensation chamber R, and no internal machining is required to slide the free piston, the machining cost of the rotary damper D can be reduced compared to a rotary damper having a free piston. Can be reduced.

  In the present embodiment, the one attenuation passage 14 that allows only the flow of liquid from the one chamber R1 to the other chamber R2, and the other attenuation passage 15 that allows only the flow of liquid from the other chamber R2 to the one chamber R1 are provided. The resistance that one attenuation passage 14 gives to the liquid flow is made larger than the resistance that the other attenuation passage 15 gives to the liquid flow, and only the other chamber R2 communicates with the temperature compensation chamber R. In this way, even if the shaft 1 rotates at the same rotational speed, the other chamber R2 has a lower pressure than the one chamber R1 among the compression-side chambers. Compared with the case of communicating with the chamber R1, the pressure increase in the temperature compensation chamber R can be kept low. Therefore, in the rotary damper D of the present embodiment, the pressure acting on the accumulator 6 can be small, so that deterioration of the accumulator 6 can be suppressed. In addition, the temperature compensation chamber R can be communicated with the one chamber R1 on the high pressure side. Even in this case, the rotary damper D can be reduced in size while exhibiting sufficient damping force. The advantage to say is not lost.

  Further, in the rotary damper D in the present embodiment, the one attenuation passage 14 and the other attenuation passage 15 are provided in the vane 2, so that the case 3 is compared with the case where the one attenuation passage 14 and the other attenuation passage 15 are provided in the casing 3. Thus, the rotary damper D can be further reduced in size. Although the one attenuation passage 14 and the other attenuation passage 15 are provided in separate vanes 2, the one attenuation passage 14 and the other attenuation passage 15 may be provided in the same vane 2. In the above description, the one damping passage 14 and the other damping passage 15 are provided. However, when it is not necessary to make the characteristics of the generated damping force of the rotary damper D different in the rotation direction of the shaft 1, the one chamber is provided. An attenuation passage may be provided that allows R1 and the other chamber R2 to communicate with each other and allows bidirectional passage so as to provide resistance to the flow of the passing liquid. Even in that case, providing the attenuation passage in the vane 2 can contribute to the miniaturization of the rotary damper D as described above.

  The partition member 4 is a separate component from the casing 3, but the partition member 4 and the case body 9 may be a single component. The partition wall member 4 includes a pair of shaft facing walls 4 a that are in sliding contact with the outer periphery of the shaft 1 and a pair of ends that extend from both ends of the shaft facing wall 4 a and are fixed to the inner periphery of the case body 9 that is the inner periphery of the casing 3. By providing the side walls 4b and 4c and providing the compensation passage 5 in the side walls 4b and 4c, the formation of the temperature compensation chamber R and the installation of the compensation passage 5 are facilitated. Further, when the compensation passage 5 is provided on the side walls 4b and 4c as an orifice, the processing of the compensation passage 5 is facilitated.

  Further, in the above description, the shaft 1 is provided with two vanes 2 and two partition members 4 are provided so as to be arranged at two locations between the vanes 2 and 2, but the number of vanes and the number of partition walls are as follows. However, the number is not limited to this, and may be three or more as long as the number is the same. The temperature compensation chamber R may be provided in any part of the partition members 4 among the partition members 4, but the temperature compensation chamber R is provided in all the partition members 4 so as to accommodate the accumulator 6. By doing so, the amount of expansion / contraction deformation of each accumulator 6 at the time of temperature compensation can be reduced, so that deterioration of the accumulator 6 can be suppressed.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

  The present invention can be used for a rotary damper for various applications, for example, a rotary damper used for a suspension of a vehicle.

D Rotary damper L Space R Temperature compensation chamber R1 One chamber R2 Other chamber 1 Shaft 2 Vane 3 Casing 4 Partition member 4a Shaft facing walls 4b and 4c Side walls 5 Compensation passage 6 Accumulator 14 One attenuation passage 15 Other attenuation passage

Claims (6)

A shaft, a plurality of vanes provided on an outer periphery of the shaft, a casing that supports the shaft while allowing rotation in the circumferential direction and accommodates the vane therein, and the shaft provided in the casing A rotary damper having a plurality of partition members disposed between the vanes, and one chamber and the other chamber formed by partitioning a space formed in the casing between the partition members with the vanes. , A temperature compensation chamber that communicates with at least one of the one chamber and the other chamber through a compensation passage that provides resistance to the flow of the liquid is provided in an arbitrary partition member, and gas is sealed inside the temperature compensation chamber A rotary damper characterized in that an accumulator to be used is accommodated. 2. The rotary damper according to claim 1, wherein a damping passage that communicates between the one chamber and the other chamber and provides resistance to a liquid flow is provided in the vane. There is provided a first attenuation passage that allows only a liquid flow from the one chamber to the other chamber, and a second attenuation passage that allows only a liquid flow from the other chamber to the one chamber, and the one attenuation passage is a liquid. 2. The rotary damper according to claim 1, wherein a resistance given to the liquid flow is made larger than a resistance given to the liquid flow by the other damping passage, and only the other chamber communicates with the temperature compensation chamber. 4. The rotary damper according to claim 3, wherein the one damping passage and the other damping passage are provided in the vane. The partition member includes a shaft facing wall facing the outer periphery of the shaft, and a pair of side walls that extend from both ends of the shaft facing wall and are fixed to the inner periphery of the casing. The rotary damper according to any one of claims 1 to 4, wherein the rotary damper is provided. The rotary damper according to any one of claims 1 to 5, wherein the temperature compensation chamber is provided in all the partition members, and the accumulator is accommodated in all the temperature compensation chambers.

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