JP2013181593A - Rotary damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary damper that does not increase a weight of a vehicle and does not require a mounting space for cushion.SOLUTION: A rotary damper includes: a case 4 provided with a hollow part 21; a pair of side panels sandwiching the case 4; a shaft 1 rotatably pivoted at each side panel and to be inserted into the hollow member 21 to partition the inside of the hollow member 21 into at least one operation room R of an substantially circular sector shape and a cushion room C of an substantially circular sector shape; a vane 5 provided in the outer circumference of the shaft 1 partitioning the operation room R to one side room R1 and the other side room R2; a stopper 6 disposed at the outer circumference of the shaft 1 and to be stored in the cushion room C; and a pair of cushions 7, 8 fixed to both sides in a circumference direction of the shaft 1 in the cushion room C to the stopper 6 and capable of being abutted to the stopper 6.

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 use of such a rotary damper in a vehicle suspension, the rotary damper is not equipped with a cushion that regulates the lifting or sinking of the vehicle body, and it is necessary to provide these cushions outside the rotary damper. there were.

  For this reason, it is necessary to provide a stopper on the suspension, which not only increases the number of parts constituting the vehicle and increases the weight of the vehicle, but also requires a space for providing the stopper.

  Accordingly, the present invention was devised to improve the above-described problems, and an object of the present invention is to provide a rotary damper that does not increase the weight of the vehicle and does not require a space for mounting a cushion on the vehicle. Is to provide.

  In order to solve the above-described problems, the problem-solving means of the present invention includes a case provided with a hollow portion, a pair of side panels sandwiching the case, and rotatably supported by the side panels. A shaft that is inserted and defines one or more substantially fan-shaped working chambers and a substantially fan-shaped cushion chamber in the hollow portion, and a vane that is provided on the outer periphery of the shaft and divides the working chamber into one chamber and the other chamber A stopper provided on the outer periphery of the shaft and accommodated in the cushion chamber, and a pair of cushions fixed to both sides of the shaft in the circumferential direction of the shaft with respect to the stopper and capable of colliding with the stopper Prepared.

  In the rotary damper configured as described above, since a cushion capable of colliding with the stopper is provided in the cushion chamber, if the rotary damper is incorporated in the suspension of the vehicle, the cushion is also incorporated in the suspension. There is no need to provide a cushion outside the rotary damper.

  According to the rotary damper of the present invention, the number of parts constituting the vehicle does not increase to increase the weight of the vehicle, and it is not required to secure a space for providing a stopper on the vehicle.

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. It is a perspective view of the cushion in the rotary damper of one embodiment. It is a cross-sectional view of the rotary damper in one modification 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, the rotary damper D in one embodiment includes a case 4 having a hollow portion 21, a pair of side panels 2 and 3 sandwiching the case 4, and the side panels 2 and 2. 3, a shaft 1 that is rotatably supported by the shaft 3 and is inserted into the hollow portion 21 so as to define a substantially fan-shaped working chamber R and a substantially fan-shaped cushion chamber C in the hollow portion 21, and provided on the outer periphery of the shaft 1. The vane 5 that divides the working chamber R into one chamber R1 and the other chamber R2, the stopper 6 provided on the outer periphery of the shaft 1 and accommodated in the cushion chamber C, and the stopper 6 in the cushion chamber C. And a pair of cushions 7 and 8 fixed to both sides of the shaft 1 in the circumferential direction and capable of colliding with the stopper 6. When the shaft 1 is rotated in the circumferential direction with respect to the case 4, Of shaft 1 It exerts a damping force for restricting the rotation.

  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. The vane 5 and the stopper 6 are provided with 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.

  In this embodiment, the vane 5 has an arcuate surface at the tip, and has a U-shaped seal extending from the upper end in FIG. 1 on the side panel 2 side to the tip and the lower end in FIG. 1 on the side panel 3 side. 9, the seal 9 is in sliding contact with the case 4 and the side panels 2 and 3, and seals between the vane 5 and the case 4 and the side panels 2 and 3.

  In this embodiment, the stopper 6 has an arcuate surface at the tip, and has a U-shaped seal extending from the upper end in FIG. 1 on the side panel 2 side to the tip and the lower end in FIG. 1 on the side panel 3 side. 10 is mounted, and the seal 10 is in sliding contact with the case 4 and the side panels 2 and 3 to seal between the stopper 6 and the case 4 and the side panels 2 and 3.

  In the case of this embodiment, the side panel 2 has a cylindrical shaft holding portion 2a through which the upper end of the shaft 1 is inserted in FIG. 1, and a flange-like cap portion provided on the outer periphery of the lower end of the shaft holding portion 2a in FIG. 2b and a plurality of bolt insertion holes 2c provided in the cap portion 2b at intervals on the same circumference. Further, a cylindrical bearing 11 that is in sliding contact with the upper side of the shaft 1 in FIG. 1 is mounted on the inner periphery of the shaft holding portion 2a. An annular sealing member 12 is mounted on the lower case 4 side, and is also on the outer periphery of the shaft 1 on the inner periphery of the shaft holding portion 2a and on the opposite side of the case 4 which is higher than the bearing 11 in FIG. An annular U packing 13 and an annular dust seal 14 that are in sliding contact with each other are mounted.

  The seal member 12 is in sliding contact with the enlarged diameter portion 1 b of the shaft 1 and the inner periphery of the side panel 2 to seal between the shaft 1 and the side panel 2. The U packing 13 is in close contact with the outer periphery of the shaft 1 to seal between the shaft 1 and the side panel 2. Further, the dust seal 14 provided at the outermost position in FIG. 1 prevents dust and dirt from entering from between the shaft 1 and the side panel 2 from the outside.

  On the other hand, in the case of this embodiment, the side panel 3 has a bottomed cylindrical shape, and is provided on a shaft holding portion 3a into which the lower end of the shaft 1 in FIG. 1 is inserted, and on the outer periphery of the upper end of the shaft holding portion 3a in FIG. A flange-shaped cap portion 3b and a plurality of bolt insertion holes 3c provided in the cap portion 3b at intervals on the same circumference. Further, a cylindrical bearing 16 slidably in contact with the outer periphery of the lower end in FIG. 1 of the shaft 1 is mounted on the inner periphery of the shaft holding portion 3a. The inner periphery of the shaft holding portion 3a is more in FIG. An annular seal member 17 is mounted on the upper case 4 side, and also on the outer periphery of the shaft 1 on the inner periphery of the shaft holding portion 3a and on the side opposite to the case 4 that is lower than the bearing 16 in FIG. An annular U-packing 18 that comes into sliding contact is mounted.

  The seal member 17 is in sliding contact with the enlarged diameter portion 1 b of the shaft 1 and the inner periphery of the side panel 3 to seal between the shaft 1 and the side panel 3. 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.

  In addition, since the bottom part in the shaft holding part 3a is obstruct | occluded in the side panel 3, since the dust seal is not provided, the lower end of the shaft 1 is protruded outward without closing the bottom part of the shaft holding part 3a. If present, a dust seal can be provided.

  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 side panel 2 is laminated above the case 4 in FIG. 1, and these are integrated by screwing a bolt 25 passed through the bolt insertion hole 2c into the screw hole 23. Further, the side panel 3 is laminated below the case 4 in FIG. 1, and these are integrated by screwing a bolt 26 passed through the bolt insertion hole 3 c into the screw hole 24. In addition, what is necessary is just to use the number requested | required on intensity | strength for the volt | bolts 25 and 26, and should just provide the bolt insertion holes 2c and 3c and screw holes 23 and 24 of the number corresponding to the number of the volt | bolts 25 and 26.

  Then, when the side panels 2 and 3 are attached to the case 4 as described above while the shaft 1 is inserted into the hollow portion 21, the hollow portion 21 is hermetically sealed and is substantially fan-shaped working chamber R and the substantially fan-shaped chamber by the shaft 1. A cushion chamber C is formed.

  The working chamber R is partitioned into a first chamber R1 and a second chamber R2 by vanes 5 provided on the shaft 1, and a fluid such as hydraulic oil is enclosed therein, for example. 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 main body 20 of the case 4 so that the space between the case 4 and the side panels 2 and 3 is sealed. The working chamber R is sealed.

  In FIG. 2, the one chamber R1 is defined on the right side of the vane 5 when viewed from the axis of the shaft 1, and the other chamber R2 is defined on the left side of the vane 5 when viewed from the axis of the shaft 1. 2, the other chamber R2 is enlarged and the one chamber R1 is reduced by the vane 5, and conversely, when the shaft 1 rotates counterclockwise in FIG. The chamber R2 is reduced and the one chamber R1 is enlarged.

  In this case, only one working chamber R is provided, but two or more working chambers R may be provided. In this case, the number of working chambers R and the number of vanes 5 provided on the shaft 1 are determined. Similarly, each working chamber R may be partitioned into one chamber R1 and the other chamber R2 by vanes 5. For example, when the shaft 1 is rotated in one direction, a chamber that is enlarged is provided as one chamber R1, and a flow channel is provided, and the other chamber is provided as a second chamber R2, and a flow channel is provided and communicated. You just have to do it. In addition, a flow path can be provided in the shaft 1 or the side panels 2 and 3, for example.

  The cushion chamber C is partitioned into a right chamber C1 and a left chamber C2 by a stopper 6 provided on the shaft 1, respectively. For example, in this example, gas is sealed. The cushion chamber C is also sealed by O-rings 27 and 28.

  Of the inner walls of the case 4 facing the cushion chamber C, the side walls SW2 and SW3 sandwiching the arc-shaped wall SW1 are connected to the cushion chamber C along the axial direction of the case 4 and are wider than the inlet. A recess 30 with 31 is provided. Specifically, the recess 30 includes a bulging portion 31 having a rounded rectangular shape in section and an inlet portion 32 that constitutes an inlet communicating the bulging portion 31 with the cushion chamber C. The inlet portion 32 is formed from the bulging portion 31. Is also narrow. Since the shape of the bulging portion 31 only needs to be wider than the width w of the inlet portion 32, shapes other than those described above can be employed.

  Cushions 7 and 8 are respectively attached to the recesses 30. As shown in FIG. 3, the cushions 7, 8 have, at the base end, a convex portion 33 having a rounded rectangular shape with an outer peripheral shape substantially coinciding with the shape of the bulging portion 31, and an inlet portion 32. And a cushion part 35 having a D-shaped cross section that protrudes from the recess 30 and is disposed in the cushion chamber C. The outer peripheral shape of the convex part 33 should just be a shape according to the shape of the bulging part 31 so that the fitting to the bulging part 31 is possible.

  The cushions 7 and 8 can be attached to the concave portion 30 by inserting the convex portion 33 into the bulging portion 31 and the intermediate portion 34 into the inlet portion 32 while sliding in the axial direction of the case 4. When the side panels 2 and 3 are attached to the case 4 after the cushions 7 and 8 are attached to the case 4 in this way, the cushions 7 and 8 are not pulled out in the axial direction of the case 4 by the side panels 2 and 3. Further, since the convex portion 33 is fitted to the bulging portion 31, the cushions 7, 8 cannot be pulled out even if the cushions 7, 8 are pulled out toward the cushion chamber C with respect to the case 4. Fixed.

  Since these cushions 7 and 8 are fixed to both sides in the circumferential direction of the shaft 1 with respect to the stopper 6, the shaft 1 rotates with respect to the case 4 so that the stopper 6 is located in the cushion chamber C from the center of the cushion chamber C. When it swings a predetermined amount, it abuts against the stopper 6 to suppress the movement of the stopper 6. Although the lengths of the cushions 7 and 8 are the same in this embodiment, they may be different, and the amount of swing until the stopper 6 abuts against the cushions 7 and 8 from the center of the cushion chamber C is set. You may make it differ.

  In the case of this embodiment, the cushion chamber C is filled with gas and divided into the right chamber C1 and the left chamber C2 by the stopper 6, and when the stopper 6 swings between the right chamber C1 and the left chamber C2. However, when the stopper 6 does not divide the cushion chamber C into two chambers, it may be prevented from functioning as a gas spring. Is possible.

  Returning, a damping passage 40 is provided from the case main body 20 of the case 4 to the valve block 22 to connect the one chamber R1 and the other chamber R2, and the valve block 22 is disposed in the middle of the damping passage 40. The damping valve 42 that resists the flow while allowing only the flow of fluid from the one chamber R1 to the other chamber R2, and is disposed in the damping passage 40 in parallel with the damping valve 42 and travels from the other chamber R2 to the one chamber R1. A check valve 43 that allows only fluid flow, and a damping valve 40 that is arranged in series with respect to the damping valve 42 and that only allows fluid flow from the other chamber R2 toward the one chamber R1. A damping valve 44 that resists the flow; a check valve 45 that is disposed in the damping passage 40 in parallel with the damping valve 44 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 42 in the middle and the accumulator 46 connected between the damping valve 44 is provided.

  Accordingly, 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 42 and the check valve 45 and expands through the damping passage 40. The damping valve 42 imparts resistance to the fluid flow, causing a differential pressure between the one chamber R1 and the other chamber R2, thereby suppressing the rotation of the shaft 1. Demonstrate.

  On the other hand, when the shaft 1 rotates counterclockwise and the vane 5 compresses the other chamber R2, the fluid pushed out from the other chamber R2 passes through the damping valve 44 and the check valve 43 and expands through the damping passage 40. Attenuation valve 44 gives resistance to this fluid flow because it moves to one chamber R1, causing a differential pressure in the other chamber R2 and one chamber R1, thereby suppressing the rotation of the shaft 1. Demonstrate power.

  In the present embodiment, since the stopper 6 also swings in the cushion chamber C, it functions as a gas spring. Therefore, the rotary damper D exhibits a spring force in addition to the damping force.

  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 It is not necessary to compensate for the volume change in the cylinder as in the case of the single rod type damper, but 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. A change in volume due to a change in temperature of the fluid is compensated. Further, the accumulator 46 applies a predetermined pressure to the sealed fluid, and increases the apparent rigidity of the fluid to improve the damping force generation response.

  Note that a U-shaped seal 47 is attached to the inner periphery of the case 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 case main body 20. Accordingly, the one chamber R1 and the other chamber R2 are tightly sealed by the seal 47, the seal 9 provided on the vane 5, the seal members 12 and 17, and the O-rings 27 and 28, and the one chamber R1 and the other chamber R2 are sealed. Communication other than the attenuation passage 40 is prevented.

  In the rotary damper D configured as described above, the cushion chamber C is formed in the case 4, and the stopper 6 that swings in the cushion chamber C is provided on the outer periphery of the shaft 1. Since the cushions 7 and 8 capable of colliding with each other are provided, if the rotary damper D is incorporated in the suspension of the vehicle, the cushions 7 and 8 are also incorporated in the suspension, and it is necessary to provide a cushion outside the rotary damper D. Disappear.

  Therefore, according to the rotary damper D, there is no need to provide a cushion outside the rotary damper D. Therefore, the number of parts constituting the vehicle is not increased and the weight of the vehicle is not increased. It is not required to secure the system. Therefore, the rotary damper D is suitable for use in a suspension application that suppresses vibration of the vehicle body of a four-wheel vehicle.

  Furthermore, in the rotary damper D of this embodiment, the case 4 is provided with a concave portion 30 that communicates with the cushion chamber C along the axial direction and has a bulging portion 31 wider than the inlet. Since the convex part 33 fitted to the bulging part 31 is provided at the base end, and the cushions 7 and 8 are fixed to the case 4, the cushions 7 and 8 do not fall off from the case 4, so that the cushion effect is lost. There is no. Moreover, the cushions 7 and 8 can be easily assembled to the case 4 by sliding the case 4 in the axial direction, and the assembling property is also good.

  Further, in the rotary damper D, the swing range of the stopper 6 is restricted by the cushions 7 and 8, so that the vane 5 cannot swing within the working chamber R due to the restriction of the swing range. In the case where there is (a lattice-hatched portion in FIG. 1), a rotary is provided by installing a fluid filled in the working chamber R and an object M formed of a material whose mass per unit volume is lighter than that of the case 4 within this range. It is also possible to reduce the weight of the damper D.

  As described above, since the cushion chamber C is separated from the working chamber R and filled with gas, the rotary damper D can be reduced in weight. On the other hand, when the fluid that fills the working chamber R is filled in the cushion chamber C, the right chamber C1 communicates with the one chamber R1, the left chamber C2 communicates with the other chamber R2, and the right chamber C1 communicates with the one chamber R1. The left chamber C2 may function as the other chamber R2 while functioning as the chamber R1. Further, when the cushion chamber C is filled with the fluid filled in the working chamber R and the stopper 6 does not divide the cushion chamber C into the right chamber C1 and the left chamber C2, the cushion chamber C is separated from the one chamber. You may make it communicate with R1 or the other chamber R2. In this way, by filling the cushion chamber C with the same fluid as the fluid filled in the working chamber R, the seal members 12 and 17 that seal the periphery of the shaft 1 cause some leakage due to deterioration over time. Since it is possible to prevent another type of fluid from entering the working chamber R, the rotary damper D can exhibit a stable damping force.

  The cushions 7 and 8 may be shaped as shown in FIG. The cushions 7 and 8 shown in FIG. 4 are provided with a convex portion 51 having a substantially circular cross section provided at the base end, and an abutting portion 52 extending from the convex portion 51 and projecting into the cushion chamber C. In this case, the cross-sectional shape of the bulging portion 31 provided in the concave portion 30 is also circular so that the convex portions 51 of the cushions 7 and 8 can be fitted. Further, a groove 51 a is provided along the axial direction at the tip of the convex portion 51 of the cushions 7 and 8, and the width L of the abutting portion 52 is set to be equal to or smaller than the width w of the inlet of the concave portion 30. Since the cushions 7 and 8 are configured as described above, when the cushions 7 and 8 are compressed toward the concave portion 30 by the stopper 6, the grooves 51a of the cushions 7 and 8 are crushed so that the cushions 7 and 8 are crushed. The abutting portion 52 is allowed to escape into the recess 30. Thus, when the cushions 7 and 8 are compressed by the stopper 6, the groove 51 a is crushed and the abutting portion 52 is allowed to enter the recess 30. And the stopper 6 can be prevented from being worn and deteriorated. Even if a cushion part wider than the width L of the abutting part 52 is provided at the tip of the abutting part 52 and this cushion part is abutted against the stopper 6, the length of the abutting part 52 is sufficiently long. Even if the cushions 7 and 8 are secured and the cushions 7 and 8 are compressed by the stopper 6 so that the cushion portions do not come into contact with the side walls SW2 and SW3, wear and deterioration of the cushions 7 and 8 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.

DESCRIPTION OF SYMBOLS 1 Shaft 2, 3 Side panel 4 Case 5 Vane 6 Stopper 7, 8 Cushion 21 Hollow part 31 Expanding part 30 Recessed part 33, 51 Convex part 51a Groove C Cushion room D Rotary damper M Material R Working room R1 One room R2 Other room

Claims (5)

A case provided with a hollow portion, a pair of side panels sandwiching the case, and one or more working chambers that are rotatably supported by the side panels and inserted into the hollow portion so as to have a substantially fan-shaped working chamber. A shaft that partitions the substantially fan-shaped cushion chamber, a vane that is provided on the outer periphery of the shaft and that partitions the working chamber into one chamber and the other chamber, and a stopper that is provided on the outer periphery of the shaft and is accommodated in the cushion chamber And a pair of cushions fixed to both sides of the shaft in the circumferential direction of the shaft with respect to the stopper and capable of abutting against the stopper. The case is provided with a concave portion that extends in the axial direction to the cushion chamber and has a bulging portion wider than the inlet, and a convex portion that fits the bulging portion is provided at the base end of the cushion. The rotary damper according to claim 1, wherein the rotary damper is fixed to the case. A groove is provided along the axial direction at the tip of the convex portion of the cushion, and the width of the portion extending from the convex portion of the cushion and projecting into the cushion chamber is made equal to or smaller than the width of the inlet of the concave portion. Item 3. The rotary damper according to Item 2. 4. An object having a lighter mass per unit volume than the fluid filled in the case and the working chamber is installed in the working chamber in a range where the vane does not swing. The rotary damper as described in any one of these. The rotary damper according to any one of claims 1 to 4, wherein the cushion chamber is filled with a fluid that fills the working chamber.

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