WO2024201696A1 - 緩衝装置、懸架装置 - Google Patents

緩衝装置、懸架装置 Download PDF

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Publication number
WO2024201696A1
WO2024201696A1 PCT/JP2023/012427 JP2023012427W WO2024201696A1 WO 2024201696 A1 WO2024201696 A1 WO 2024201696A1 JP 2023012427 W JP2023012427 W JP 2023012427W WO 2024201696 A1 WO2024201696 A1 WO 2024201696A1
Authority
WO
WIPO (PCT)
Prior art keywords
rod
seal
rod guide
seal portion
shock absorber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/012427
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
駿 成田
慧 古川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Astemo Ltd
Original Assignee
Hitachi Astemo Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Astemo Ltd filed Critical Hitachi Astemo Ltd
Priority to CN202380095341.9A priority Critical patent/CN120835963A/zh
Priority to PCT/JP2023/012427 priority patent/WO2024201696A1/ja
Priority to KR1020257029371A priority patent/KR20250140615A/ko
Priority to DE112023005627.7T priority patent/DE112023005627T5/de
Priority to JP2025509319A priority patent/JPWO2024201696A1/ja
Publication of WO2024201696A1 publication Critical patent/WO2024201696A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3235—Constructional features of cylinders
    • F16F9/3242—Constructional features of cylinders of cylinder ends, e.g. caps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • F16F9/362—Combination of sealing and guide arrangements for piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • F16F9/362—Combination of sealing and guide arrangements for piston rods
    • F16F9/364—Combination of sealing and guide arrangements for piston rods of multi-tube dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/30—Sealing arrangements

Definitions

  • the present invention relates to shock absorbers and suspension systems.
  • the shock absorber of Patent Document 1 includes a cylinder, an outer tube that is disposed outside the cylinder and covers the cylinder, and a rod guide that closes the open ends of the cylinder and the outer tube and supports a rod that is inserted movably into the cylinder.
  • a piston connected to the lower end of the rod is inserted slidably below the cylinder, and the piston divides the cylinder into a rod side chamber and a piston side chamber that are filled with hydraulic oil, and a reservoir filled with gas and hydraulic oil is formed between the cylinder and the outer tube.
  • a seal member is stacked above the rod guide, and includes an annular insert metal, an inner seal that is held on the inner circumference of the insert metal and in sliding contact with the outer circumference of the rod, and an outer seal that is held on the outer circumference of the insert metal and in close contact with the outer circumference of the rod guide and the outer tube.
  • a cylindrical slide bearing is attached to the inner circumference of the guide part of the rod guide, and the rod is inserted slidably into the slide bearing.
  • the rod guide has a recess on the inner circumference and a communication hole that connects this recess to the surface of the flange facing the reservoir, so that hydraulic oil that passes between the rod and the slide bearing can be returned to the reservoir via the communication hole.
  • the rod guide has a hole that passes through a part of the rod guide to connect the recess on the inner periphery with the reservoir, so there is room for improvement in terms of easily molding the rod guide.
  • the through hole is molded using a mold, the structure of the mold becomes complicated and the cost of the mold becomes high. Also, if the through hole is molded by cutting, a cutting process is required.
  • An object of the present invention is to provide a shock absorber and the like in which a rod guide can be easily manufactured.
  • the present invention which has been completed with the above object in mind, comprises an inner cylinder in which a working fluid is sealed, an outer cylinder provided outside the outer periphery of the inner cylinder and forming a reservoir chamber for storing the working fluid between the inner cylinder and the outer cylinder, a piston portion defining a space formed within the inner cylinder, a rod having one end which holds the piston portion and the other end which protrudes from an opening of the outer cylinder, a rod guide which slidably supports the rod and has an outer periphery which contacts the inner surface of the outer cylinder, a first seal portion which is provided on the opening side of the rod guide in the axial direction of the rod and forms a contact portion with the rod guide, and provides a seal between the rod and the outer cylinder, and and a sealing member having a second seal portion that seals between the rod guide and the inner surface of the outer tube, wherein the rod guide has a pressed portion provided at the end of the outer periphery on the opening side against which an inner portion of the
  • the rod guide may be formed with a groove that connects the inside and outside of the contact portion.
  • the rod guide may be formed with a plurality of grooves that connect the inside and outside of the contact portion, and the number of the notches may be greater than the number of the grooves.
  • either the number of the grooves or the number of the notches may be an even number, and the other may be an odd number.
  • four or more of the notches may communicate with a plurality of the grooves.
  • the rod guide may communicate with the groove and define a circumferential flow passage between the rod guide and the seal member, through which the working fluid moves in a circumferential direction.
  • the sealing member may also have a third seal portion between the first seal portion and the second seal portion, which allows the working fluid to flow from the first seal portion to the second seal portion, while suppressing the working fluid from flowing from the second seal portion to the first seal portion. Furthermore, the axial tip end portion of the second seal portion does not have to be pressed against the rod guide.
  • the cutout may have a rectangular shape when viewed in the axial direction. The cutout may be provided with a protruding portion that protrudes from a bottom surface toward the rod guide. Viewed from another perspective, the present invention is a suspension system including the shock absorber described above and a spring disposed around the shock absorber.
  • the present invention provides a shock absorber that allows rod guides to be easily manufactured.
  • FIG. 1 is a diagram showing an example of a schematic configuration of a suspension device according to a first embodiment
  • FIG. 2 is an enlarged view of part II in FIG.
  • FIG. 2 is a perspective view of a rod guide and a seal member
  • FIG. 2 is a diagram showing an example of a flow path.
  • 13A and 13B are diagrams illustrating an example of a modified example of a notch.
  • 13 is a diagram showing an example of a cross section of a rod guide and a seal member according to a second embodiment.
  • FIG. FIG. 11 is a perspective view showing an example of a schematic configuration of a rod guide and a seal member according to a third embodiment.
  • 13A and 13B are diagrams illustrating an example of a schematic configuration of a seal member according to a fourth embodiment.
  • FIG. 13A and 13B are diagrams showing an example of a perspective view of a rod guide according to a fifth embodiment, as viewed from a second side, and a perspective view of a sealing member according to the fifth embodiment, as viewed from a first side.
  • FIG. 13 is a diagram showing an example of a cross section of a rod guide and a seal member according to a fifth embodiment.
  • FIG. 1 is a diagram showing an example of a schematic configuration of a suspension device 1 according to the first embodiment.
  • FIG. 2 is an enlarged view of part II in FIG.
  • FIG. 3 is a perspective view of the rod guide 60 and the seal member 80.
  • the suspension system 1 is a suspension used in four-wheeled vehicles such as passenger automobiles, and as shown in Fig. 1, comprises a hydraulic shock absorber 2 and a coil spring 3 arranged on the outside of the shock absorber 2.
  • the suspension system 1 also comprises a lower spring seat 4 that supports an end of the coil spring 3 on a first axial side (lower side in Fig. 1) of a rod 20 described below, and an upper spring seat 5 that supports an end of the coil spring 3 on a second axial side (upper side in Fig. 1) of the rod 20.
  • the suspension 1 also includes a vehicle body bracket 6 that is attached to the second axial end of the rod 20 for mounting the suspension 1 to a vehicle, and a wheel side bracket 7 that is fixed to the first axial end of the rod 20 in the cylinder section 10 (described later) for mounting the suspension 1 to a wheel.
  • the suspension 1 also includes a dust cover 8 that covers at least a portion of the cylinder section 10 and the rod 20.
  • the axial direction of the rod 20 may be simply referred to as the "axial direction”.
  • the axial direction is also the direction of the center line of the cylindrical inner tube 11, which will be described later.
  • the first axial side (lower side in FIG. 1) and the second axial side (upper side in FIG. 1) may be simply referred to as the “first side” and the “second side", respectively.
  • the direction that intersects with the axial direction (for example, the perpendicular direction) may be referred to as the "radial direction”.
  • the center line side of the inner tube 11 may be simply referred to as the "inner side”
  • the side away from the center line may be simply referred to as the "outer side".
  • the shock absorber 2 includes a cylinder portion 10 that contains oil, and a rod 20 whose second end protrudes from the cylinder portion 10 and whose first end is inserted into the cylinder portion 10.
  • the shock absorber 2 also includes a piston portion 30 that is provided at the first end of the rod 20, and a bottom portion 40 that is provided at the first end of the cylinder portion 10.
  • the shock absorber 2 also includes a rebound sheet 50 that is fixed to the rod 20, and a rebound rubber 51 that is an annular elastic member that is arranged on the second side of the rebound sheet 50 in order to reduce the impact when the rod 20 extends.
  • the cylinder section 10 comprises a thin-walled cylindrical inner tube 11, a thin-walled cylindrical outer tube 12 provided on the outside of the inner tube 11, and a bottom cover 13 that closes the first end of the outer tube 12.
  • the inner tube 11 and the outer tube 12 are arranged so that the center line direction of the cylinders coincides with the axial direction.
  • the cylinder section 10 forms a reservoir chamber R between the outer peripheral surface of the inner tube 11 and the inner peripheral surface of the outer tube 12.
  • the reservoir chamber R is filled with oil on the first side and gas on the second side.
  • the cylinder portion 10 includes a rod guide 60 that movably supports the rod 20, a bump stopper cap 15 attached to the second end of the outer tube 12, and a sealing member 80 that prevents oil leakage from within the cylinder portion 10 and the intrusion of foreign matter into the cylinder portion 10.
  • the rod guide 60 and the seal member 80 will be described in detail later.
  • the rod 20 is a rod-shaped member that extends in the axial direction.
  • the rod 20 holds the piston portion 30 on the first side.
  • the rod 20 also connects to the vehicle body, for example, via the vehicle body bracket 6 on the second side.
  • the piston portion 30 includes a piston 31, a valve group 32 that blocks first ends of some of the oil passages formed in the piston 31, and a valve group 33 that blocks second ends of some of the oil passages formed in the piston 31.
  • the piston 31 contacts the inner surface of the inner tube 11 via a sealing member provided on its outer surface, and divides the space inside the inner tube 11 filled with oil into a first oil chamber Y1 on the first side of the piston 31 and a second oil chamber Y2 on the second side of the piston 31.
  • the bottom portion 40 includes a valve body 41 having a plurality of oil passages passing through in the axial direction, a valve 42 provided on a first side of the valve body 41, and a valve 43 provided on a second side of the valve body 41.
  • the valve body 41 of the bottom portion 40 separates the first oil chamber Y1 and the reservoir chamber R.
  • the rod guide 60 includes a thin-walled cylindrical guide 61 disposed inside, and a guide case 70 that holds the guide 61 inside.
  • the inner diameter of the guide 61 is set slightly larger than the outer diameter of the rod 20 inserted inside.
  • the inner diameter of the guide 61 is 0.1 mm to 1 mm larger than the outer diameter of the rod 20.
  • the inner circumferential surface of the guide 61 comes into contact with the outer circumferential surface of the rod 20, so it is molded from a material that is more abrasion resistant than the guide case 70.
  • the guide case 70 has a cylindrical inner cylindrical portion 71 provided on the inside, and a cylindrical outer cylindrical portion 72 provided on the outside of the inner cylindrical portion 71.
  • the inner cylindrical portion 71 and the outer cylindrical portion 72 are integrally molded so that the outer peripheral surface of the second side portion of the inner cylindrical portion 71 and the inner peripheral surface of the first side portion of the outer cylindrical portion 72 are joined.
  • the guide 61 is fitted inside the inner cylindrical portion 71.
  • the outer diameter of the inner cylindrical portion 71 is formed to be equal to the inner diameter of the inner tube 11.
  • the inner cylindrical portion 71 is then positioned inside the inner tube 11 with its outer circumferential surface in contact with the inner circumferential surface of the inner tube 11.
  • the outer diameter of the outer cylindrical portion 72 is molded to be equal to the inner diameter of the second end of the outer tube 12.
  • the outer cylindrical portion 72 is disposed between the rod 20 and the outer tube 12 on the second side of the inner tube 11 with its outer peripheral surface in contact with the inner peripheral surface of the outer tube 12.
  • the outer cylindrical portion 72 has an inner recess 721 formed at the end of the second side on the inside and recessed from the second side end face 720, which is the end face of the second side, an outer recess 722 formed at the end of the second side on the outside and recessed from the second side end face 720, and an outer peripheral recess 723 recessed from the outer peripheral surface.
  • the opening of the inner recess 721 on the second side is chamfered.
  • the outer recess 722 is recessed into a substantially cylindrical shape, and has an inclined surface 724 formed so that the outer diameter of the second side end of the outer cylindrical portion 72 gradually decreases toward the second side.
  • the outer recess 722 also has a parallel surface 725 that is substantially parallel to the axial direction and extends from the second side end of the inclined surface 724 to the second side, and an orthogonal surface 726 that is orthogonal to the axial direction and extends outward from the first side end of the inclined surface 724.
  • the outer peripheral recess 723 is formed by forming a portion of the outer peripheral surface of the outer cylindrical portion 72 into a plane parallel to the axial direction.
  • the outer peripheral recess 723 is recessed over the entire axial area.
  • the outer peripheral recess 723 connects the outer recess 722 to the reservoir chamber R formed on the first side of the outer cylindrical portion 72.
  • Multiple outer peripheral recesses 723 are formed at equal intervals in the circumferential direction.
  • the shape of the outer peripheral recess 723 is not limited as long as the outer recess 722 and the reservoir chamber R are connected to each other.
  • the outer peripheral recess 723 may be recessed from the outer peripheral surface in a concave shape.
  • the number of outer peripheral recesses 723 may also be one.
  • a groove 727 is formed at the second end of the outer cylindrical portion 72, recessed from the second end face 720 and connecting the inner recess 721 and the outer recess 722.
  • the groove 727 is formed in a straight line extending in the radial direction.
  • multiple grooves 727 are formed at equal intervals in the circumferential direction. For example, the same number of grooves 727 as the outer peripheral recesses 723 are formed, and the grooves 727 are formed so that their circumferential positions are the same as the outer peripheral recesses 723.
  • the circumferential size of the groove 727 can be, for example, 1/15 to 1/25 of the circumferential size of the second side end surface 720 .
  • the guide case 70 configured as above can be made of, for example, a metal such as steel or a non-metallic material such as polytetrafluoroethylene.
  • the seal member 80 has an annular ring 81 made of a metal such as steel, and an elastic portion 90 made of a material with a low elastic modulus such as synthetic rubber.
  • the seal member 80 is formed by bonding the elastic portion 90 to the ring 81 by, for example, baking, and the ring 81 holds the elastic portion 90.
  • the ring 81 is annular, with an inner diameter larger than the outer diameter of the rod 20 and slightly smaller than the inner diameter of the second end of the outer tube 12.
  • the outer diameter of the ring 81 is 0.5 mm to 3 mm smaller than the inner diameter of the second end of the outer tube 12.
  • the elastic portion 90 is provided on the first side of the ring 81, has a wedge-shaped cross section, and has a seal lip portion 91 that is pressed by an annular spring to come into close contact with the entire circumference of the outer circumferential surface of the rod 20.
  • the elastic portion 90 is also provided on the second side of the ring 81, and has a dust lip 92 that comes into close contact with the entire circumference of the outer circumferential surface of the rod 20 to prevent dust from entering from the outside.
  • the seal lip portion 91 and the dust lip 92 are integrally molded so as to be joined at a location inside the ring 81.
  • the elastic portion 90 also has an outer circumferential seal portion 93 that protrudes from the outer circumferential portion of the ring 81 to the first side over the entire circumference.
  • the outer circumferential seal portion 93 is cylindrical and has an outer diameter larger than the outer diameter of the ring 81.
  • the inner diameter of the outer circumferential seal portion 93 is equal to or larger than the diameter of the end portion of the first side at the inclined surface 724 and is smaller than the outer diameter of the ring 81.
  • the outer circumferential seal portion 93 is positioned to fit into the outer recess 722 of the guide case 70 of the rod guide 60 and contacts the inner circumferential surface of the outer tube 12, thereby preventing oil from leaking from the gap between the outer circumferential surface of the guide case 70 and the inner circumferential surface of the outer tube 12.
  • the outer peripheral seal portion 93 has multiple (e.g., eight) notches 931 recessed outward from the inner peripheral surface, formed at equal intervals in the circumferential direction.
  • the notches 931 are arc-shaped with the bottom 932 at the apex.
  • the notches 931 are formed so that the bottom 932 is gradually positioned outward as it moves from the second side to the first side, and the cross-sectional area of the notches 931 cut at a plane perpendicular to the axial direction gradually increases as it moves from the second side to the first side.
  • the circumferential size of the notch 931 can be, for example, 1/60 to 1/100 of the circumferential size of the outer peripheral seal portion 93.
  • the elastic portion 90 also has a central seal portion 94 that protrudes from the inner periphery of the ring 81 all around in a direction inclined axially outward toward the first side.
  • the central seal portion 94 contacts the inner recess 721 of the outer cylindrical portion 72 of the guide case 70, thereby preventing the oil and gas filled in the reservoir chamber R from moving inward via the flow path 75 (see FIG. 4).
  • the central seal portion 94 and the seal lip portion 91 are integrally molded so as to be joined at a location on the first side of the ring 81.
  • the elastic portion 90 also has a connection portion 95 that connects the outer peripheral seal portion 93 and the central seal portion 94 on the first side of the ring 81.
  • the connection portion 95 is molded around the entire circumference.
  • the connection portion 95 protrudes, for example, 1 mm to 5 mm from the first side end surface 811 of the ring 81.
  • the first side end surface 811 of the ring 81 is covered by the seal lip portion 91, the central seal portion 94, the connection portion 95, and the outer circumferential seal portion 93.
  • the second side end surface 812 of the ring 81 has an inner portion covered by the dust lip 92, and an outer portion exposed and not covered by the elastic portion 90.
  • the seal member 80 When assembling the shock absorber 2, after inserting the rod guide 60 into the outer tube 12, the seal member 80 is inserted into the outer tube 12 until the elastic portion 90 covering the first side end surface 811 of the ring 81 comes into contact with the second side end surface 720 of the guide case 70.
  • the seal member 80 is held in the outer tube 12 by bending the second side end surface of the outer tube 12 inward, that is, by applying so-called roll crimping.
  • the axial movement of the seal member 80 is restricted by the connection portion 95 of the elastic portion 90 coming into contact with the second side end surface 720 of the outer cylindrical portion 72 of the guide case 70 and the outer periphery of the second side end surface 812 of the ring 81 coming into contact with the outer tube 12 bent inward.
  • the seal member 80 is provided at the opening on the second side of the outer tube 12 to block the opening.
  • the tip of the central seal portion 94 of the seal member 80 contacts the inner recess 721 of the guide case 70.
  • the outer peripheral surface 934 of the outer peripheral seal portion 93 of the seal member 80 contacts the inner peripheral surface of the outer tube 12, and the inner peripheral surface 935 contacts the inclined surface 724 of the guide case 70.
  • the tip 933 of the outer peripheral seal portion 93 of the seal member 80 does not contact the orthogonal surface 726 of the guide case 70, and a gap is formed between the tip 933 and the orthogonal surface 726.
  • FIG. 4 is a diagram showing an example of the flow path 75.
  • the rod guide 60 and the seal member 80 configured as above form a flow path 75 that returns the oil that has passed through the gap between the rod 20 and the guide 61 and reached the second side of the inner cylindrical portion 71 of the guide case 70 to the reservoir chamber R.
  • the flow path 75 is configured by the gap between the rod guide 60 and the seal member 80 and the gap between the rod guide 60 and the outer tube 12.
  • the flow path 75 has a first flow path 751 configured by the groove 727 of the outer cylindrical portion 72 and the seal member 80, and a second flow path 752 configured by the gap between the parallel surface 725 of the outer cylindrical portion 72 and the outer peripheral seal portion 93.
  • the flow path 75 also has a third flow path 753 configured by the inclined surface 724 and the notch 931 formed in the outer peripheral seal portion 93, a fourth flow path 754 configured by the tip portion 933 of the outer peripheral seal portion 93 and the orthogonal surface 726, and a fifth flow path 755 configured by the outer peripheral recess 723 and the outer tube 12.
  • the first flow path 751 is a flow path that moves in the radial direction from the inner recess 721.
  • the second flow path 752 is a flow path that moves in the circumferential direction between the parallel surface 725 of the guide case 70 and the seal member 80.
  • the third flow path 753 is a flow path that moves in a direction inclined with respect to the axial direction between the inclined surface 724 of the guide case 70 and the seal member 80.
  • the fourth flow path 754 is a flow path that moves in the circumferential direction between the perpendicular surface 726 of the guide case 70 and the seal member 80 and the outer tube 12.
  • the fifth flow path 755 is a flow path that moves in the axial direction between the outer peripheral recess 723 of the guide case 70 and the outer tube 12.
  • the oil may move through the first flow path 751 and then flow into the third flow path 753 without moving circumferentially through the second flow path 752. Also, after moving through the third flow path 753, the oil may flow into the fifth flow path 755 without moving circumferentially through the fourth flow path 754.
  • the shock absorber 2 includes an inner cylinder 11 in which oil as an example of a working fluid is sealed, an outer cylinder 12 that is provided outside the outer periphery of the inner cylinder 11 and forms a reservoir chamber R for storing oil between the inner cylinder 11, and a piston portion 30 that partitions a space formed in the inner cylinder 11.
  • the shock absorber 2 also includes a rod 20 that holds the piston portion 30 at a first end as an example of one end and has a second end as an example of the other end protruding from an opening of the outer cylinder 12, and a rod guide 60 that slidably supports the rod 20 and has an outer periphery that contacts the inner surface of the outer cylinder 12.
  • the shock absorber 2 also includes a seal member 80 that is provided on the opening side of the rod guide 60 in the axial direction of the rod 20 to form a contact portion 100 with the rod guide 60, and has a seal lip portion 91 as an example of a first seal portion that seals between the rod 20 and the outer cylinder 12, and an outer periphery seal portion 93 as an example of a second seal portion that seals between the rod 20 and the inner surface of the outer cylinder 12.
  • the contact portion 100 is formed by the second side end surface 720 of the outer cylindrical portion 72 of the rod guide 60 and the connection portion 95 of the elastic portion 90 of the seal member 80 (see FIG. 2).
  • the rod guide 60 has an inclined surface 724 as an example of a pressed portion, which is provided at the end of the outer periphery on the opening side and against which an inner portion (e.g., inner periphery surface 935) of a portion (e.g., outer periphery surface 934) in the outer periphery seal portion 93 that contacts the inner surface of the outer tube 12 is pressed.
  • the rod guide 60 also has an outer periphery recess 723 that forms a fifth flow path 755 as an example of an outer periphery flow path that returns oil to the reservoir chamber R between the outer periphery and the inner surface of the recessed outer tube 12.
  • the inner periphery surface 935 that is pressed against the inclined surface 724 of the outer periphery seal portion 93 has a notch 931 that forms a third flow path 753 as an example of a relay flow path that flows the oil that has reached the opening side through the gap between the seal lip portion 91 and the rod 20 toward the fifth flow path 755.
  • a flow path 75 is formed by the gap between the rod guide 60 and the seal member 80, which returns the hydraulic oil that has passed through the gap between the rod 20 and the guide 61 and reached the second side of the inner cylindrical portion 71 of the guide case 70 to the reservoir chamber R.
  • a communication path that connects the inner recess 721 and the reservoir chamber R is not formed by a hole that penetrates the guide case 70 in the axial direction, for example. Therefore, the guide case 70 can be easily molded.
  • the guide case 70 when a hole that penetrates in the axial direction is molded using a mold, at least one of the first side mold and the second side mold that are divided in the axial direction needs a protrusion for molding the through hole.
  • a hole that penetrates in the axial direction is molded by cutting, a cutting process is required.
  • the communication passage that connects the inner recess 721 and the reservoir chamber R is not formed by a hole that penetrates the inside of the guide case 70, so the guide case 70 can be easily molded.
  • the outer peripheral seal portion 93 is less likely to deform inward, and the contact pressure between the outer peripheral surface 934 of the outer peripheral seal portion 93 and the inner peripheral surface of the outer tube 12 is high. This prevents oil from leaking from the gap between the outer peripheral seal portion 93 and the inner peripheral surface of the outer tube 12.
  • a groove 727 that communicates the inside and outside of the contact portion 100 is formed in the rod guide 60. This makes it possible to form a flow path 75 by the gap between the rod guide 60 and the seal member 80. Further, the rod guide 60 is formed with a plurality of grooves 727 that communicate between the inside and outside of the contact portion 100, and the number of the notches 931 is greater than the number of the grooves 727. This allows the oil that has passed through the grooves 727 to be quickly returned to the reservoir chamber R.
  • the rod guide 60 also communicates with the groove 727 and forms a second flow passage 752, an example of a circumferential flow passage through which oil moves circumferentially, between the rod guide 60 and the seal member 80. This allows the oil that has passed through the groove 727 to be returned to the reservoir chamber R even if the circumferential position of the groove 727 does not match the circumferential position of the cutout 931.
  • the axial tip 933 of the outer circumferential seal portion 93 is not pressed against the rod guide 60. This creates a gap between the tip 933 and the rod guide 60, so that the oil that has passed through the groove 727 can be returned to the reservoir chamber R even if the circumferential position of the notch 931 does not match the circumferential position of the outer circumferential recess 723 of the guide case 70.
  • the seal member 80 also has a central seal portion 94 between the seal lip portion 91 and the outer circumferential seal portion 93, which is an example of a third seal portion that allows oil to flow from the seal lip portion 91 to the outer circumferential seal portion 93, while preventing oil from flowing from the outer circumferential seal portion 93 to the seal lip portion 91. This makes it possible to prevent oil from flowing from the reservoir chamber R into the inner tube 11 through the gap between the rod guide 60 and the seal member 80.
  • the shape of the notch 931 formed in the outer circumferential seal portion 93 when cut along a plane perpendicular to the axial direction is an arc shape with the bottom portion 932 as the apex, but is not particularly limited to this shape.
  • FIG. 5 is a diagram showing an example of a modified example of the notch 931.
  • the cutout 931 may have a rectangular shape when cut along a plane perpendicular to the axial direction.
  • connection portions 936 between both circumferential ends of the cutout 931 and the inner circumferential surface 935 are substantially at right angles, the cutout 931 is unlikely to be crushed even if the inner circumferential surface 935 is pressed against the inclined surface 724 of the guide case 70, and the third flow path 753 is formed with high certainty.
  • a protrusion 938 protruding inward from the bottom surface 937 may be provided in the circumferential center of the notch 931. Even if the shape of the notch 931 cut at a plane perpendicular to the axial direction is rectangular and the circumferential size is large, the protrusion 938 is pressed against the inclined surface 724 of the guide case 70, making the notch 931 less likely to be crushed. As a result, the third flow path 753 is formed with high certainty.
  • FIG. 6 is a diagram showing an example of a cross section of a rod guide 260 and a seal member 280 according to the second embodiment.
  • a rod guide 260 according to the second embodiment is different from the rod guide 60 according to the first embodiment in that a guide case 270 corresponding to the guide case 70 is provided.
  • a seal member 280 according to the second embodiment is different from the seal member 80 according to the first embodiment in that an elastic portion 290 corresponding to the elastic portion 90 is provided. Differences from the first embodiment will be described below. The same reference numerals are used for the same parts in the first and second embodiments, and detailed descriptions thereof will be omitted.
  • the guide case 270 and sealing member 280 in the second embodiment are configured so that there are always four or more points where the circumferential position of the groove 727 of the outer cylindrical portion 72 that constitutes the first flow path 751 coincides with the circumferential position of the notch 931 of the outer peripheral seal portion 93.
  • guide case 270 differs from guide case 70 according to the first embodiment in that seven grooves 727 are formed at equal intervals in the circumferential direction.
  • seal member 280 differs from seal member 80 according to the first embodiment in that twelve notches 931 are formed at equal intervals in the circumferential direction.
  • Figure 6 shows an embodiment in which there are five locations (circles in the figure) where the circumferential position of groove 727 and the circumferential position of notch 931 match.
  • the rod guide 260 and seal member 280 according to the second embodiment configured as described above allow oil that has moved to the second side through the gap between the rod 20 and the guide 61 to be quickly returned to the reservoir chamber R.
  • seven grooves 727 are formed in the guide case 270, and twelve notches 931 are formed in the seal member 280, but these numbers are not particularly limited. It is preferable that one of the number of grooves 727 and the number of notches 931 is an even number, and the other is an odd number. This makes it easier for the circumferential positions of the grooves 727 and the notches 931 to coincide. However, it is preferable that the number of notches 931 is greater than the number of grooves 727. This is because the oil that has moved to the second side through the gap between the rod 20 and the guide 61 can be quickly returned to the reservoir chamber R.
  • FIG. 7 is a perspective view showing an example of a schematic configuration of a rod guide 360 and a seal member 380 according to the third embodiment.
  • the rod guide 360 according to the third embodiment is different from the rod guide 60 according to the first embodiment in that it has a guide case 370 that corresponds to the guide case 70.
  • the seal member 380 according to the third embodiment is different from the seal member 80 according to the first embodiment in that it has an elastic portion 390 that corresponds to the elastic portion 90.
  • the same reference numerals are used for the same parts in the first and third embodiments, and detailed descriptions thereof will be omitted.
  • the guide case 370 and elastic portion 390 according to the third embodiment are configured so that the circumferential position of the groove 727 of the outer cylindrical portion 72 that constitutes the first flow path 751 and the circumferential position of the notch 931 of the outer peripheral seal portion 93 coincide with each other with a high degree of accuracy.
  • the guide case 370 has an engagement recess 371 recessed from the parallel surface 725, the inclined surface 724, and the orthogonal surface 726 between the groove 727 and the outer peripheral recess 723.
  • the circumferential size of the engagement recess 371 is larger than the circumferential size of the groove 727 and smaller than the circumferential size of the outer peripheral recess 723.
  • the elastic portion 390 is provided with protrusions 394 that protrude inward from the inner circumferential surface 935 at both circumferential ends of the cutout 931 in the outer circumferential seal portion 393 that corresponds to the outer circumferential seal portion 93.
  • the circumferential size between the protrusions 394 provided at both circumferential ends of the cutout 931 is smaller than the circumferential size of the fitting recess 371 of the guide case 370.
  • the number of notches 931 may be the same as that of the groove 727. Furthermore, the number of grooves 727 and notches 931 may be less than that in the first embodiment. For example, the number of grooves 727 and notches 931 may be two each.
  • FIG. 8 is a diagram showing an example of a schematic configuration of a seal member 480 according to the fourth embodiment.
  • the seal member 480 according to the fourth embodiment differs from the seal member 80 according to the first embodiment in that it has a ring 481 corresponding to the ring 81 and an elastic portion 490 corresponding to the elastic portion 90.
  • the differences from the first embodiment will be described below.
  • the same reference numerals are used for the same parts in the first and fourth embodiments, and detailed descriptions thereof will be omitted.
  • the ring 481 differs from the ring 81 according to the first embodiment in that the first side end face 811 is configured to contact the second side end face 720 of the guide case 70.
  • the ring 481 has a plurality of (e.g., eight) recesses 482 formed at the radial center thereof, recessed from the first side end face 811 toward the second side, at equal intervals in the circumferential direction.
  • connection portion 495 corresponds to the connection portion 95 that connects the outer periphery seal portion 93 and the central seal portion 94.
  • the connection portion 495 is provided only in the area where the recess 482 is formed in the ring 481, and connects the outer periphery seal portion 93 and the central seal portion 94 only in the area where the recess 482 is formed.
  • the first side end surface 811 where the recess 482 is not formed is exposed and not covered by the elastic portion 490. Then, when the rod guide 60 and the seal member 480 are assembled, the first side end surface 811 contacts the second side end surface 720 of the guide case 70. This prevents a decrease in the axial holding force of the second side end portion of the outer tube 12 bent inward due to the presence of an elastic body between the ring 481 of the seal member 480 and the guide case 70.
  • FIG. 9 is a perspective view of a rod guide 560 according to the fifth embodiment as viewed from the second side, and a perspective view of a seal member 580 according to the fifth embodiment as viewed from the first side.
  • FIG. 10 is a diagram showing an example of a cross section of a rod guide 560 and a seal member 580 according to the fifth embodiment.
  • the rod guide 560 according to the fifth embodiment is different from the rod guide 60 according to the first embodiment in that it has a guide case 570 that corresponds to the guide case 70.
  • the seal member 580 according to the fifth embodiment is different from the seal member 80 according to the first embodiment in that it has an elastic portion 590 that corresponds to the elastic portion 90.
  • the same reference numerals are used for the same parts in the first and fifth embodiments, and detailed descriptions thereof will be omitted.
  • the guide case 570 differs from the guide case 70 according to the first embodiment in that the groove 727 is not formed.
  • the elastic portion 590 differs from the elastic portion 90 according to the first embodiment in a connection portion 595 corresponding to the connection portion 95.
  • the connection portion 595 has a recess 596 recessed from the end face on the first side at a portion where the cutout 931 is formed in the outer circumferential seal portion 93.
  • the recess 596 is formed so as to be continuous with the cutout 931.
  • the rod guide 560 and seal member 580 according to the fifth embodiment eliminate the need to form a groove 727 in the guide case 570, allowing the mold used to mold the guide case 570 to be simplified in configuration.
  • oil that has passed through the recess 596 of the connection part 595 can be quickly returned to the reservoir chamber R via the cutout 931 and the outer peripheral recess 723 without moving in the circumferential direction.
  • 1...Suspension device 2...Shock absorber, 3...Coil spring (an example of a spring), 10...Cylinder portion, 11...Inner cylinder, 12...Outer cylinder, 20...Rod, 30...Piston portion, 60...Rod guide, 75...Flow path, 80...Sealing member, 91...Seal lip portion (an example of a first sealing portion), 93...Outer peripheral sealing portion (an example of a second sealing portion), 94...Central sealing portion, 95...Connection portion, 100...Contact portion, 722...Outer recess, 723...Outer peripheral recess, 724...Inclined surface (an example of a pressed portion), 726...Orthogonal surface, 727...Groove, 751...First flow path, 752...Second flow path, 753...Third flow path, 754...Fourth flow path, 755...Fifth flow path, 931...Notch, 933...Tip portion, 938...Pro

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)
PCT/JP2023/012427 2023-03-28 2023-03-28 緩衝装置、懸架装置 Ceased WO2024201696A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202380095341.9A CN120835963A (zh) 2023-03-28 2023-03-28 缓冲装置、悬架装置
PCT/JP2023/012427 WO2024201696A1 (ja) 2023-03-28 2023-03-28 緩衝装置、懸架装置
KR1020257029371A KR20250140615A (ko) 2023-03-28 2023-03-28 완충 장치, 현가 장치
DE112023005627.7T DE112023005627T5 (de) 2023-03-28 2023-03-28 Stossdämpfungsvorrichtung und federungsvorrichtung
JP2025509319A JPWO2024201696A1 (https=) 2023-03-28 2023-03-28

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PCT/JP2023/012427 WO2024201696A1 (ja) 2023-03-28 2023-03-28 緩衝装置、懸架装置

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JP (1) JPWO2024201696A1 (https=)
KR (1) KR20250140615A (https=)
CN (1) CN120835963A (https=)
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WO (1) WO2024201696A1 (https=)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5869157U (ja) * 1981-11-04 1983-05-11 厚木自動車部品株式会社 密封装置
JPH0637658U (ja) * 1992-10-20 1994-05-20 トキコ株式会社 油圧緩衝器
JPH0667940U (ja) * 1993-03-01 1994-09-22 株式会社ショーワ 油圧緩衝器のロッドガイド構造
JP2003156093A (ja) * 2001-11-16 2003-05-30 Showa Corp 油圧緩衝器のフリクション付与構造

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6080257B2 (ja) 2013-01-25 2017-02-15 Ｋｙｂ株式会社 緩衝器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5869157U (ja) * 1981-11-04 1983-05-11 厚木自動車部品株式会社 密封装置
JPH0637658U (ja) * 1992-10-20 1994-05-20 トキコ株式会社 油圧緩衝器
JPH0667940U (ja) * 1993-03-01 1994-09-22 株式会社ショーワ 油圧緩衝器のロッドガイド構造
JP2003156093A (ja) * 2001-11-16 2003-05-30 Showa Corp 油圧緩衝器のフリクション付与構造

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JPWO2024201696A1 (https=) 2024-10-03
KR20250140615A (ko) 2025-09-25
CN120835963A (zh) 2025-10-24

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