JP2013181594A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary damper that can exhibit an aimed damping force, even when a pressure in an operation room has become high.SOLUTION: A rotary damper D includes: a shaft 1; a pair of side panels 2, 3 axially supporting the shaft 1 while allowing the rotation in a circumferential direction; a case 4 provided between the side panels 2 and 3 and forming an operation room R inside; and a vane 5 provided in the shaft 1 having a tip end in sliding contact with an inner circumference of the case 4 and partitioning the operation room R to one side room R1 and the other side room R2. In the damper, there is provided a pressing member P for pressing each side panels 2, 3 toward the vane 5.

Description

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

  Conventionally, in a rotary damper, a shaft, a pair of side panels that pivotally support the shaft while allowing rotation in the circumferential direction, and a case that is sandwiched between these side panels to form a working chamber inside. The vane is provided on the shaft and divides the working chamber into 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 working chamber as the shaft rotates, and to reduce the other chamber. A damping force that suppresses the rotation of the shaft is exhibited by applying resistance to the flow of oil moving from the one chamber to the other chamber with a damping valve (see Patent Document 1).

JP-A-8-177828

  Considering the case where such a rotary damper is incorporated into a vehicle suspension, for example, the rotary damper case is fixed to the vehicle body, and the rotary damper shaft is swingably attached to the vehicle body to hold the wheel. By connecting to the arm, the rotary damper is incorporated into the suspension. More specifically, the shaft and the suspension arm are connected with the rotation direction of the shaft coincident with the swinging direction of the suspension arm.

  Here, in particular, when a rotary damper is used for a suspension of a four-wheel vehicle, it is necessary to generate a large damping force in order to attenuate the vibration of the heavy vehicle body, and the pressure in the working chamber becomes very high. When the working chamber becomes extremely high in pressure, the side panel holding the case is bent by the internal pressure in the working chamber, a gap is created between the vane and the side panel, and the one chamber communicates with the other chamber through the gap. End up.

  Then, the oil in the working chamber can bypass the damping valve and go back and forth between the one chamber and the other chamber via the gap, and the damping force as intended may not be exhibited.

  Accordingly, the present invention has been developed to improve the above-described problems, and the object of the present invention is to provide a rotary damper that can exhibit a desired damping force even when the working chamber has a high pressure. Is to provide.

  In order to solve the above-described problems, the problem-solving means of the present invention is provided between a shaft, a pair of side panels that pivotally support the shaft while allowing the shaft to rotate in the circumferential direction, and the side panels. In a rotary damper comprising: a case that forms a working chamber therein; and a vane that is provided on the shaft and has a tip that slides into the inner periphery of the case and divides the working chamber into one chamber and the other chamber. A pressing member that presses each side panel toward the vane side is provided.

  Since the side panel is pressed toward the vane by the pressing member, the side panel and the vane are kept in contact with each other even if the pressure in the working chamber becomes high, and the one chamber and the other chamber are around the vane. It will not be possible to communicate via.

  According to the rotary damper of the present invention, a desired damping force can be exhibited even when the working chamber is at a high pressure.

It is a longitudinal cross-sectional view of the rotary damper in one embodiment. It is a cross-sectional view of the rotary damper in one embodiment.

  The present invention will be described below based on the embodiments shown in the drawings. As shown in FIGS. 1 and 2, the rotary damper D in one embodiment includes a shaft 1, a pair of side panels 2 and 3 that support the shaft 1 while allowing the shaft 1 to rotate in the circumferential direction, and these A case 4 provided between the side panels 2 and 3 and forming a working chamber R therein, and a tip 1 provided on the shaft 1 and slidingly contacting the inner periphery of the case 4 to connect the working chamber R to the one chamber R1. And the other chamber R2 and a pressing member P that presses the side panels 2 and 3 toward the vane 5 side. 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 case 4.

  Hereinafter, each part of the rotary damper D will be described in detail. First, the shaft 1 has a cylindrical shape and is provided in the middle of a serration 1a that is provided on the outer periphery of one end, which is the upper end in FIG. 1, and that can fix an arm A that is connected to a suspension arm of a vehicle (not shown). 1 includes an enlarged diameter portion 1b having a diameter larger than that of the upper end and the lower end, and a pair of vanes 5 and 5 provided on the outer circumference of the enlarged diameter portion 1b and having a phase of 180 degrees in the circumferential direction. In addition, in the place mentioned above, although the serration 1a is provided for the coupling | bonding to the coupling etc. outside a figure, the connection method is not limited to this.

  As shown in FIG. 1, the arm A includes an annular mounting portion a1 that is mounted on the outer periphery of the serration 1a of the shaft 1, and a rod-shaped arm portion a2 that extends from the mounting portion a1 and is connected to a suspension arm that is not shown. And is non-rotatably connected to the shaft 1 by a cylindrical bolt B screwed to the inner periphery of the upper end of the shaft 1 in FIG.

  In the case of this embodiment, the side panel 2 has a cylindrical shape, a shaft insertion portion 2a through which the upper end of the shaft 1 in FIG. 1 is inserted, and an outer periphery of the lower end of the shaft insertion portion 2a in FIG. A flange-shaped cap portion 2b stacked via the plate 6 and a plurality of bolt insertion holes 2c provided on the cap portion 2b at intervals on the same circumference are provided.

  A cylindrical bearing 11 that is in sliding contact with the upper side of the shaft 1 in FIG. 1 is attached to the inner periphery of the shaft insertion portion 2a, and is also the inner periphery of the shaft insertion portion 2a. An annular U-packing 13 and an annular dust seal 14 that are in sliding contact with the outer periphery of the shaft 1 are respectively mounted on the opposite side of the case 4. The U packing 13 is in close contact with the outer periphery of the shaft 1 and seals between the shaft 1 and the side panel 2. The dust seal 14 provided at the outermost position in FIG. Prevents dust and dirt from entering between. Furthermore, an O-ring 15 is mounted on the case 4 side of the cap portion 2b, and this O-ring 15 seals between the side panel 2 and the plate 6.

  Further, as shown in FIG. 1, the shaft insertion portion 2a is provided with an opening 2d. The opening 2d has an arm A connected to the upper end of the shaft 1 accommodated in the shaft insertion portion 2a. The part a2 is inserted, and the arm a2 protrudes outside the shaft insertion part 2a.

  Further, as shown in FIGS. 1 and 2, two annular grooves 2e and 2f surrounding the outer periphery of the shaft insertion portion 2a are provided on the cap portion 2b on the plate 6 side. Are laminated, an annular channel is formed by the annular grooves 2e and 2f.

  In the case of this embodiment, the other side panel 3 also has a cylindrical shaft insertion portion 3a through which the lower end of the shaft 1 is inserted in FIG. 1, and a case provided on the outer periphery of the upper end of the shaft insertion portion 3a in FIG. 4 is provided with a flange-like cap portion 3b stacked via a plate 7 and a plurality of bolt insertion holes 3c provided in the cap portion 3b at intervals on the same circumference.

  A cylindrical bearing 16 slidably in contact with the lower side of the shaft 1 in FIG. 1 is mounted on the inner periphery of the shaft insertion portion 3a. Similarly, the inner periphery of the shaft insertion portion 3a is more An annular U-packing 18 and an annular dust seal 19 that are in sliding contact with the outer periphery of the shaft 1 are mounted on the opposite case 4 side, which is the middle and lower part. The U-packing 18 is in close contact with the outer periphery of the shaft 1 to seal between the shaft 1 and the side panel 3, and the dust seal 19 provided at the outermost position in the lowermost part in FIG. Prevents dust and dirt from entering between. Further, an O-ring 20 is mounted on the case 4 side of the cap portion 3b. The O-ring 20 seals between the side panel 2 and the plate 7.

  The plates 6 and 7 are annular plates that are thinner than the side panels 2 and 3, and a plurality of bolt insertion holes 6a and 7a provided at positions corresponding to the bolt insertion holes 2c and 3c of the side panels 2 and 3, respectively. It has. As shown in FIG. 2, the plate 6 is provided with two through holes 6b and 6c that communicate with the annular groove 2e and two through holes 6d and 6e that communicate with the annular groove 2f when stacked on the side panel 2. It has been.

  An annular seal member 12 is attached to the inner periphery of the plate 6, and this seal member 12 is in close contact with the upper end surface in FIG. 1 of the enlarged diameter portion 1 b of the shaft 1 and the inner peripheral surface of the plate 6. The space between them is sealed. An annular seal member 17 is also attached to the inner periphery of the plate 7, and this seal member 17 is in close contact with the lower end surface in FIG. 1 of the enlarged diameter portion 1 b of the shaft 1 and the inner peripheral surface of the plate 7. The space between them is sealed.

  In addition, since the vane 5 slides on the side surfaces of the vanes 5 of the plates 6 and 7, the side surfaces of the vanes 5 of the plates 6 and 7 are preferably made of a material having excellent wear resistance. For example, the entire plate 6 or 7 may be formed of a material with high hardness, or the surface (sliding surface) that contacts the vane 5 of the plate 6 or 7 is plated or a diamond-like carbon film is formed. Alternatively, the surface may be subjected to gas soft nitriding treatment, heat treatment or silicon attachment treatment to increase the wear resistance of the surface. Further, in this case, the through holes 6b, 6c, 6d, and 6e are installed within a range in which the vane 5 does not come into sliding contact even when the shaft 1 rotates with respect to the case 4 to the rotation limit as shown in FIG. If provided, the through holes 6b, 6c, 6d, and 6e do not interfere with the seal 10, and the deterioration of the seal 10 can be suppressed.

  The case 4 includes a case main body 20 having a hollow portion 21 that forms a working chamber R, a valve block 22 provided on a side portion of the case main body 20, and the side panel 2 on the upper end side in FIG. A plurality of screw holes 23 provided at positions corresponding to the bolt insertion holes 2c, and a plurality of screw holes 24 provided at positions corresponding to the bolt insertion holes 3c of the side panel 3 on the lower end side in FIG. It is configured with.

  The plate 6 and the side panel 2 are laminated in order on the upper side of the case 4 in FIG. 1, and these are integrated by screwing the bolts 25 passed through the bolt insertion holes 2c and 6a into the screw holes 23. The In addition, the plate 7 and the side panel 3 are sequentially laminated below the case 4 in FIG. 1, and the bolts 26 that pass through the bolt insertion holes 3 c and 7 a are screwed into the screw holes 24. It becomes. In addition, what is necessary is just to use the number requested | required on intensity | strength for the volt | bolts 25 and 26, and if the bolt insertion hole 2c, 3c, 6a, 7a of the number corresponding to the number of the volt | bolts 25 and 26 and the screw holes 23 and 24 are provided. Good.

  Then, when the plates 6 and 7 and the side panels 2 and 3 are attached to the case 4 while the shaft 1 is inserted into the hollow portion 21, the hollow portion 21 is sealed as shown in FIG. Two fan-shaped working chambers R are formed. These two working chambers R are each divided into a space L1 and a space L2 by vanes 5 provided on the shaft 1, and for example, fluid such as hydraulic oil is enclosed therein. In addition, O-rings 27 and 28 surrounding the outer periphery of the hollow portion 21 are attached to the upper and lower ends in FIG. 1 of the case body 20 of the case 4 so that the space between the case 4 and the plates 6 and 7 is sealed. Chamber R is sealed. When the shaft 1, the plates 6, 7 and the side panels 2, 3 are assembled to the case 4, both ends of the shaft 1 are not projected from the shaft insertion portions 2 a, 3 a of the side panels 2, 3, but inside these It is to be accommodated.

  In FIG. 2, the space L1 is defined on the right side of the vane 5 when viewed from the axis of the shaft 1, and the space L2 is defined on the left side of the vane 5 when viewed from the axis of the shaft 1. When the shaft 1 rotates clockwise, each space L2 is enlarged and each space L1 is reduced by the vane 5. On the other hand, when the shaft 1 rotates counterclockwise in FIG. Is reduced and each space L1 is enlarged.

  As shown in FIG. 2, the through-hole 6b provided in the plate 6 communicates with one side of the space L1, the through-hole 6c communicates with the other side of the space L1, and the through-holes 6b and 6c are side panels. 2 are communicated with each other by an annular groove 2e. Accordingly, the spaces L1 whose volumes are both expanded or reduced with the rotation of the shaft 1 are communicated with each other by the annular groove 2e and the through holes 6b and 6c to form a one chamber R1. Further, as shown in FIG. 2, the through-hole 6d provided in the plate 6 communicates with one side of the space L2, the through-hole 6e communicates with the other side of the space L2, and the through-holes 6d and 6e are connected to the side panel. 2 are communicated with each other by an annular groove 2f. Therefore, the spaces L2 whose volumes are both expanded or reduced with the rotation of the shaft 1 are communicated with each other by the annular groove 2f and the through holes 6d and 6e to form the other chamber R2. The one chamber R1 and the other chamber R2 are partitioned by the vane 5 as can be understood from the above description.

  Returning, a damping passage 30 is provided from the case body 20 of the case 4 to the valve block 22 so as to communicate the one chamber R1 and the other chamber R2, and the valve block 22 is disposed in the middle of the damping passage 30. A damping valve 32 that provides resistance to the flow while allowing only a flow of fluid from the one chamber R1 to the other chamber R2, and is disposed in the damping passage 30 in parallel with the damping valve 32 and travels from the other chamber R2 to the one chamber R1. A check valve 33 that allows only a fluid flow, and is arranged in series with respect to the damping valve 32 in the middle of the damping passage 30 and allows only a fluid flow from the other chamber R2 toward the one chamber R1. A damping valve 34 that resists flow; a check valve 35 that is disposed in the damping passage 30 in parallel with the damping valve 34 and that allows only the flow of fluid from one chamber R1 to the other chamber R2, and a damping passage 0 and the damping valve 32 in the middle and an accumulator 36 connected between the damping valve 34 is provided.

  Therefore, when the shaft 1 rotates clockwise and the vane 5 compresses the one chamber R1, the fluid pushed out from the one chamber R1 passes through the damping valve 32 and the check valve 35 and expands through the damping passage 30. The damping valve 32 gives resistance to the flow of the fluid and causes a differential pressure between the one chamber R1 and the other chamber R2, thereby suppressing the rotation of the shaft 1. To demonstrate.

  On the other hand, when the shaft 1 rotates counterclockwise and the vane 5 compresses the other chamber R2, the fluid pushed out of the other chamber R2 passes through the damping valve 34 and the check valve 33 and expands through the damping passage 30. When the damping valve 34 gives resistance to the flow of the fluid, the differential pressure is generated between the other chamber R2 and the one chamber R1, thereby suppressing the rotation of the shaft 1. Demonstrate power.

  In the rotary damper D, the volume of the expansion or contraction of the one chamber R1 due to the rotation of the shaft 1 is equal to the volume of the contraction or expansion of the other chamber R2, so that the linear motion composed of the cylinder, piston and piston rod Unlike the single rod type damper, it is not necessary to compensate for the volume change in the cylinder. However, since it is necessary to compensate for the volume change of the fluid due to the temperature change, in this case, the volume change of the fluid must be compensated. A change in volume due to a change in temperature of the fluid is compensated. In addition, the accumulator 36 applies a predetermined pressure to the sealed fluid, and increases the apparent rigidity of the fluid to improve the damping force generation response.

  In addition, a U-shaped seal 29 is attached to the inner periphery of the main body 20 of the case 4 and the portion that is in sliding contact with the outer periphery of the enlarged diameter portion 1 b of the shaft 1 and the upper and lower ends of the main body 20. Further, in the present embodiment, the vane 5 described above has an arcuate surface at the tip, and extends from the upper end in FIG. 1 on the side panel 2 side to the lower end in FIG. 1 on the tip and side panel 3 side. A letter-shaped seal 10 is attached. The seal 10 is in sliding contact with the case 4 and the annular plates 6 and 7 stacked on the case 4 to seal between the vane 5 and the case 4 and the plates 6 and 7. Therefore, the one chamber R1 and the other chamber R2 are tightly sealed by the seal 29, the seal 10 provided on the vane 5, the seal members 12 and 17 attached to the inner periphery of the plates 6 and 7, and the O-rings 27 and 28. Thus, the one chamber R1 and the other chamber R2 do not communicate with each other except the attenuation passage 30. Since the through holes 6b, 6c, 6d and 6e provided in the plate 6 are provided outside the range where the vane 5 is slidably contacted as described above, the seal 10 penetrates even if the shaft 1 rotates. It does not interfere with the holes 6b, 6c, 6d, 6e, and deterioration is not accelerated.

  In the present embodiment, the pressing member P includes a bolt 40 inserted into the shaft 1 and a nut 41. The bolt 40 includes a flange 40a, a shaft 40b rising from the flange 40a, and a screw portion 40c provided at the tip, which is the upper end in FIG. 1 of the shaft 40b. The An annular stopper 42 is fitted to the upper end of the shaft insertion portion 2a of the side panel 2 in FIG. 1, and an annular stopper 43 is fitted to the lower end of the shaft insertion portion 3a of the side panel 3 in FIG. Has been. Then, when the shaft 40b of the bolt 40 is inserted into the shaft 1 from the side panel 3 side through the inside of the stoppers 42 and 43 and the flange 40a is brought into contact with the stopper 43, the screw portion 40c is moved outward from the inner periphery of the stopper 42. It protrudes to. In this state, the nut 41 is screwed onto the screw portion 40c and brought into contact with the stopper 42. Further, when the nut 41 is further tightened, the side panels 2 and 3 are moved to the vane 5 side via the stoppers 42 and 43. Can be pressed. That is, the side panels 2 and 3 are sandwiched between the bolts 40 and the nuts 41, and the side panels 2 and 3 are moved by rotating the nuts 41 relative to the screw portions 40c and moving the bolts 40 toward the flanges 40a. Thus, the pressing force can be applied in the direction in which they approach each other. The stopper 42 and the nut 41 may be a single component, and the stopper 43 may be integrated with the flange 40a of the bolt 40.

  In the rotary damper D configured as described above, pressing means P for pressing the side panels 2 and 3 toward the vane 5 side is provided. Since the side panels 2 and 3 are pressed toward the vane 5 by the pressing means P, the plates 6 and 7 are kept in contact with the vane 5 even when the pressure in the working chamber R becomes high. Since the chamber R1 and the other chamber R2 communicate with each other through the vane 5 and bypass the damping valves 32 and 34, the one and the other chambers R1 and R2 do not go back and forth. The damping force can be exhibited. In this way, the rotary damper D can exhibit the desired damping force even when the pressure in the working chamber R becomes high, so that it can be used for suspension applications that suppress vibration of the vehicle body of a four-wheeled vehicle. Suitable.

  Even when the vanes 5 are directly slidably contacted with the side panels 2 and 3 without providing the plates 6 and 7, the side panels 2 and 3 are pressed toward the vane 5 by the pressing means P. Therefore, even if the pressure in the working chamber R becomes high, the desired damping force can be exhibited. When the plates 6 and 7 are not provided in this way, a flow path is formed in the side panel 2 or the side panel 3 instead of forming a flow path that connects the spaces L1 and the spaces L2 between the plate 6 and the side panel 2. You just have to do it. When the plates 6 and 7 are provided, it is easy to form the flow path, and there is an advantage that the side panels 2 and 3 do not have to be formed of a material having excellent wear resistance.

  Further, as the pressing means P, it is only necessary to sandwich the side panels 2 and 3 in the axial direction and press them toward the vane 5 without depending on the bolt 40 and the nut 41 described above. , 3 can be clamped from the outer peripheral side, and a configuration can be adopted in which these are pressed toward the vane 5 side.

  In the rotary damper D of the present embodiment, the side panel 2 allows the shaft 1 to be inserted, the shaft 1 has a cylindrical shape, and the bolt 40 and the nut through which the pressing member P is inserted into the shaft 1. 41, the bolts 40 and nuts 41 sandwich the side panels 2 and 3 and press them to the vane 5 side, so that the pressing member P can be arranged in the shaft 1, The rotary damper D can be reduced in size, and the mountability on the vehicle is improved.

  Furthermore, in the rotary damper D of the present embodiment, the side panels 2 and 3 are cylindrical, and the shaft insertion portions 2a and 3a through which the shaft 1 is inserted, and one end outer periphery of the shaft insertion portions 2a and 3a. An opening 2d that includes a flange-shaped cap portion 2b, 3b that is provided and stacked on the case 4 and that allows the insertion of the arm A connected to the internal shaft 1 into the shaft insertion portion 2a of one side panel 2 is provided. Since the shaft insertion portions 2a and 3a of the side panels 2 and 3 are sandwiched between the bolts 40 and the nuts 41 so as to press the side panels 2 and 3 toward the vane 5, the pressing member P is provided. However, this can be accommodated in the shaft 1 to reduce the size of the rotary damper D, and the damping force that is the output of the shaft 1 can be transmitted to the outside through the arm A.

  In the above description, the valve block 22 is provided in the case 4 and the damping valves 32 and 34 are provided in the valve block 22. However, the damping passage, the check valve, and the damping valve are provided in the vane 5, and the accumulator is connected to the shaft 1. It is also possible to eliminate the valve block by providing it in the interior, and when there is no need to change the damping characteristic (the characteristic of the damping force with respect to the rotational speed of the shaft 1) in the rotational direction of the shaft 1, A damping force may be exerted by the damping valve.

  Further, although two vanes 5 are provided as described above, the number of installations may be one or three or more, and it is only necessary to install an appropriate number according to the specifications of the rotary damper D. In the present embodiment, the case 4 is formed of a single component, but may be configured of a plurality of components.

  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.

DESCRIPTION OF SYMBOLS 1 Shaft 2, 3 Side panel 2a, 3a Shaft insertion part 2b, 3b Cap part 2d Opening 4 Case 5 Vane 6, 7 Plate 6a, 7a Bolt insertion hole 12, 17 Seal member 40 Bolt 41 Nut A Arm D Rotary damper P Press Member R Working chamber R1 One chamber R2 The other chamber

Claims (3)

A shaft, a pair of side panels that pivotally support the shaft while allowing rotation in the circumferential direction, a case that is provided between the side panels to form a working chamber therein, and a tip that is provided on the shaft A rotary damper provided with a vane that slidably contacts the inner periphery of the case and divides the working chamber into one chamber and the other chamber, and has a pressing member that presses the side panels toward the vane side. Rotary damper characterized by The side panel allows the shaft to be inserted, the shaft is cylindrical and includes the vane on the outer periphery, and the pressing member includes a bolt and a nut that are inserted into the shaft. The rotary damper according to claim 1, wherein each side panel is sandwiched between the nut and the nut and pressed to the vane side. Each of the side panels includes a shaft insertion portion through which the shaft is inserted, and a flange-shaped cap portion that is provided on the outer periphery of one end of the shaft insertion portion and stacked on the case. An opening that allows the insertion of an arm connected to the internal shaft is provided in the shaft insertion portion of the shaft, and the shaft insertion portion of each side panel is sandwiched between the bolt and the nut to press the side panel toward the vane side. The rotary damper according to claim 2.

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