WO2026009338A1 - Amortisseur - Google Patents

Amortisseur

Info

Publication number
WO2026009338A1
WO2026009338A1 PCT/JP2024/024017 JP2024024017W WO2026009338A1 WO 2026009338 A1 WO2026009338 A1 WO 2026009338A1 JP 2024024017 W JP2024024017 W JP 2024024017W WO 2026009338 A1 WO2026009338 A1 WO 2026009338A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston rod
cylinder
shock absorber
wall portion
elastic member
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.)
Pending
Application number
PCT/JP2024/024017
Other languages
English (en)
Japanese (ja)
Inventor
亮 尾池
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
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 Astemo Ltd filed Critical Astemo Ltd
Priority to PCT/JP2024/024017 priority Critical patent/WO2026009338A1/fr
Publication of WO2026009338A1 publication Critical patent/WO2026009338A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F16F9/58—Stroke limiting stops, e.g. arranged on the piston rod outside the cylinder

Definitions

  • the present invention relates to a shock absorber.
  • Patent Document 1 discloses a prior art shock absorber.
  • the shock absorber shown in Patent Document 1 comprises a cylinder, a piston rod that is movable back and forth relative to the cylinder, a piston that is fixed to one end of the piston rod and displaces, a rod guide attached to the tip of the cylinder, a flange that extends radially from the other end of the piston rod, an elastic member that is supported by the flange and comes into contact with the end plate when the piston rod reaches its forward limit, and a sensor that surrounds the elastic member and detects the amount of displacement of the piston.
  • the piston rod moves forward relative to the cylinder.
  • the elastic member comes into contact with the rod guide.
  • the elastic member undergoes elastic deformation, compressing axially and expanding radially. This prevents the piston rod from moving beyond its forward limit.
  • the piston rod advances more than a predetermined distance, there is a risk that the elastic member will deform beyond its elastic range.
  • the objective of the present invention is to provide a shock absorber that can control the amount of deformation of the elastic member.
  • a cylinder constituted by a cylindrical body; a piston rod, which is a rod-shaped member having one end facing the inside of the cylinder and the other end protruding from the cylinder, and which is provided so as to be able to advance and retreat relative to the cylinder when a force in a compression direction or an extension direction is applied; a piston fixed to one end of the piston rod and displaceable relative to the cylinder together with the piston rod; a flange portion extending radially from the other end of the piston rod; an elastic member fixed to a portion of the cylinder through which the piston rod passes, the elastic member coming into contact with the flange and elastically deforming when the piston rod reaches its forward limit; an outer wall portion provided in a portion of the cylinder through which the piston rod passes and covering at least a portion of the outer circumferential surface of the elastic member.
  • the present invention provides a shock absorber that can control the amount of deformation of the elastic member.
  • FIG. 1 is a cross-sectional view of a main part of a shock absorber according to a first embodiment.
  • FIG. 2 is an enlarged view of a main part of FIG. 1 .
  • 3 is a diagram illustrating a compression stroke of the shock absorber shown in FIG. 2.
  • FIG. 4A is a cross-sectional view of a main part of a shock absorber according to a second embodiment
  • FIG. 4B is a cross-sectional view of a main part of a shock absorber according to a comparative example.
  • the shock absorber 10 is, for example, a rear cushion provided at the rear of a saddle-ride type vehicle. As an example, the upper end of the shock absorber 10 is connected to the vehicle body, and the lower end is connected to the rear wheel.
  • the shock absorber 10 may be used alone or in a plurality of units of two or more. Energy such as vibrations generated by the influence of unevenness in the road surface is damped as the shock absorber 10 expands and contracts, and transmission of the energy to the vehicle body and occupants is suppressed.
  • the state of the shock absorber 10 shown in FIG. 1 may be referred to as the "normal state.”
  • the shock absorber 10 comprises a first mounting portion 11 located at the upper end and attached to another part such as the vehicle body, a cylinder 12 which is a cylindrical body supported by the first mounting portion 11, a cylinder lid portion 13 which closes the lower end of the cylinder 12, an end plate 30 provided at the lower end of the cylinder 12, an elastic member 15 fixed to the end plate 30, a second mounting portion 16 located at the lower end and attached to another part such as the rear wheel, a piston rod 17 supported by the second mounting portion 16 and one end of which extends into the interior of the cylinder 12, and a piston rod 17.
  • the piston 18 is fixed to one end of the second mounting portion 16 and abuts against the inner surface of the cylinder 12, a rod fixing nut 19 that fixes the piston rod 17 to the second mounting portion 16, a flange 21 that is supported by the second mounting portion 16 and extends radially, a sensor 22 that is attached to the flange 21 and surrounds the piston rod 17 to detect the amount of displacement of the piston 18, a suspension spring 23 that urges the piston 18 in a direction that moves it downward (backward) relative to the cylinder 12, and a spring seat 24 that is attached to the flange 21 and receives the lower end of the suspension spring 23.
  • the cylinder 12 does not necessarily have to be constructed as a double cylinder consisting of an inner cylinder portion 12a and an outer cylinder portion 12b, and may instead be constructed as a single cylinder.
  • the cylinder lid portion 13 is provided along both the inner circumferential surface of the inner cylinder portion 12a and the inner circumferential surface of the outer cylinder portion 12b.
  • the cylinder lid portion 13 includes a seal member 13a that prevents oil from leaking out of the cylinder 12.
  • the seal member 13a abuts against the inner circumferential surface of the outer cylinder portion 12b and is formed, for example, by an O-ring.
  • the end plate 30 is provided at the tip of the outer tube portion 12b and is sandwiched between the outer tube portion 12b and the cylinder lid portion 13.
  • the end plate 30 has a guide body 31 provided with a small gap from the outer periphery of the piston rod 17, an outer wall portion 32 extending from the outer end of the guide body 31 (guide portion) along the axis CL toward the flange portion 21, an inner wall portion 33 extending from the inner end of the guide body 31 along the axis CL toward the flange portion 21, and a retaining portion 34 extending from the outer wall portion 32 toward the axis CL and preventing the elastic member 15 from coming out.
  • the outer wall portion 32 and inner wall portion 33 are formed integrally with the end plate 30.
  • a portion of the guide body 31 is arranged along the inner circumferential surface of the outer tube portion 12b, and the portion that expands in diameter from the portion along this inner circumferential surface abuts against the tip of the outer tube portion 12b.
  • the outer wall portion 32 is formed in a continuous annular shape. However, the outer wall portion 32 may be formed intermittently, taking into account the amount of deformation of the elastic member 15.
  • the inner diameter of the inner wall portion 33 is formed to be the same size as the inner diameter of the guide body 31.
  • the inner wall portion 33 is formed in a continuous annular shape. However, the inner wall portion 33 may be formed intermittently, taking into account the amount of deformation of the elastic member 15.
  • the length (height) of the outer wall portion 32 along the axis CL is longer (higher) than the length (height) of the inner wall portion 33 and shorter (lower) than the length (height) of the elastic member 15.
  • the position of the outer wall portion 32 is detected by the sensor 22.
  • the distance from the outer wall portion 32 to the elastic member 15 can be set by the inner diameter of the outer wall portion 32.
  • the position at which the retaining portion 34 is formed is approximately aligned with the tip of the inner wall portion 33.
  • the retaining portion 34 may be formed in multiple portions intermittently in the circumferential direction, or may be formed continuously in the circumferential direction.
  • the elastic member 15 is made of a material such as rubber, and when a compressive force is applied to the shock absorber 10, it comes into contact with the flange 21 and undergoes elastic deformation.
  • materials other than rubber can be used for the elastic member 15 as long as they are capable of elastic deformation when in contact with the flange 21.
  • the elastic member 15 is a ring-shaped member that is continuous in the circumferential direction and is sandwiched between the outer wall portion 32, the inner wall portion 33, and the retaining portion 34.
  • a female thread is formed in the center of the second mounting portion 16 along the axis CL, and the piston rod 17 is screwed into it.
  • the tip of the second mounting portion 16 is also formed in a stepped shape, and the center of the flange portion 21 is fitted into it.
  • One end of the piston rod 17 is located inside the inner cylindrical portion 12a, and the other end is threadedly engaged with the second mounting portion 16.
  • the piston 18 has a flow path formed inside it that generates a damping force when compressed, and a flow path that generates a damping force when extended, and leaf springs for setting the damping force are provided at the ends of each flow path.
  • the rod fixing nut 19 prevents the piston rod 17 from coming loose from the second mounting portion 16.
  • the sensor 22 has, for example, a coil 22a wound around the axis CL, a sensor inner cylindrical portion 22b which is a cylindrical body provided on the inner periphery of the coil 22a, and a sensor outer cylindrical portion 22c which is a cylindrical body provided on the outer periphery of the coil 22a.
  • the magnetic field changes. This change in the magnetic field makes it possible to detect the position of the outer wall 32. It is also possible to detect the position of the piston 18 in the cylinder 12 relative to the position of the outer wall 32. In other words, the amount of compression of the shock absorber 10 can be detected.
  • a compression coil spring is used for the suspension spring 23.
  • the suspension spring 23 applies a biasing force in the direction that moves the flange 21 away from the cylinder 12.
  • the spring bearing portion 24 has a donut-shaped disk portion 24b on whose upper surface the suspension spring 23 is placed, and a cylindrical spring bearing portion 24c that is provided from the center of the disk portion 24b along the outer periphery of the sensor 22.
  • the disc portion 24b and the spring receiving cylindrical portion 24c may be integrally formed from a single member. In other words, they do not necessarily have to be constructed as separate bodies as in this embodiment.
  • the force of the suspension spring 23 applies a force to the shock absorber 10 in the extension direction. This causes the flange 21 to move away from the cylinder 12.
  • the tip of the outer wall portion 32 is displaced to a position where it comes into contact with the flange portion 21.
  • the elastic member 15 comes into contact with the flange portion 21 and elastically deforms.
  • the amount of radial deformation of the elastic member 15 is determined by the inner diameter of the outer wall portion 32. If the inner diameter of the outer wall portion 32 is small, the distance between the outer wall portion 32 and the elastic member 15 is short, and the amount of deformation of the elastic member 15 is small. If the inner diameter of the outer wall portion 32 is large, the distance between the outer wall portion 32 and the elastic member 15 is long, and the amount of deformation of the elastic member 15 is large. In other words, the amount of deformation of the elastic member 15 can be set by the inner diameter of the outer wall portion 32.
  • the shock absorber 10A according to Example 2 does not have a sensor 22 (see Figure 2). Furthermore, the shock absorber 10A according to Example 2 uses a spring receiving portion 24A in which a disc portion 24Ab and a spring receiving cylindrical portion 24Ac are integrally formed.
  • the other basic configuration is the same as that of the shock absorber 10 (see Figure 1). For configurations that are the same as those of the shock absorber 10, the same reference numerals will be used and detailed descriptions will be omitted where appropriate.
  • the outer periphery of the piston rod 17 is surrounded by an end plate 30 or elastic member 15 in the area between the cylinder 12 and the spring bearing portion 24A.
  • Figure 4B shows a shock absorber 110 according to a comparative example.
  • an elastic member 115 is provided on the inner periphery of the spring bearing portion 24A.
  • shock absorber 10 described above is summarized below.
  • the shock absorber 10 comprises a cylinder 12 formed by a cylindrical body; a piston rod 17, which is a rod-shaped member having one end facing the interior of the cylinder 12 and the other end protruding from the cylinder 12 and capable of moving back and forth relative to the cylinder 12 when a force in the compression or expansion direction is applied; a piston 18 fixed to one end of the piston rod 17 and displacing relative to the cylinder 12 together with the piston rod 17, thereby generating a damping force; a flange 21 extending radially from the other end of the piston rod 17; an elastic member 15 fixed to a portion of the cylinder 12 through which the piston rod 17 passes (e.g., end plate 30); and an outer wall 32 provided in the portion of the cylinder 12 through which the piston rod 17 passes and covering at least a portion of the outer periphery of the elastic member 15.
  • a piston rod 17 which is a rod-shaped member having one end facing the interior of the cylinder 12 and the other end protruding from the cylinder 12 and capable
  • the elastic member 15 is supported by the cylinder 12, and its outer periphery is surrounded by the outer wall portion 32.
  • the amount of deformation of the elastic member 15 during the compression stroke can be set by the inner diameter of the outer wall portion 32. This makes it possible to prevent the elastic member 15 from deforming excessively or insufficiently.
  • a shock absorber 10 can be provided that can control the amount of deformation of the elastic member 15.
  • the first shock absorber 10 further includes a sensor 22 provided on the outer periphery of the outer wall portion 32 for detecting the amount of displacement of the piston 18 relative to the cylinder 12.
  • the provision of the outer wall portion 32 prevents the elastic member 15 from coming into contact with the sensor 22 when the elastic member 15 is deformed, thereby protecting the sensor 22.
  • the sensor 22 detects the position of the piston 18 by detecting the position of the outer wall portion 32.
  • the tip of the outer wall portion 32 is located closer to the flange portion 21 than the tip of the cylinder 12.
  • the size of the sensor 22 can be made smaller than when detecting the tip of the outer wall portion 32.
  • the height of the outer wall portion 32 is set so that the tip of the piston rod 17 abuts against the flange portion 21 when the piston rod 17 reaches its forward limit. This prevents the elastic member 15 from further deforming when the piston rod 17 reaches its forward limit, allowing for better control of the amount of deformation of the elastic member 15.
  • the shock absorber 10A according to Example 2.
  • any one of the shock absorbers 10 of the first to fourth embodiments further includes an inner wall portion 33 between the piston rod 17 and the elastic member 15, which prevents the elastic member 15 from deforming toward the piston rod 17.
  • the formation of the inner wall portion 33 prevents the elastic member 15 from coming off toward the inner periphery. The same applies to the shock absorber 10A according to the second embodiment.
  • the height of the inner wall portion 33 is lower than the height of the outer wall portion 32. Because the outer wall portion 32 comes into contact with the flange portion 21 first, the inner wall portion 33 can be prevented from coming into contact with the rod fixing nut 19. The same applies to the shock absorber 10A according to Example 2.
  • the outer wall portion 32 is positioned at the outermost position when no force is applied to the piston rod 17 in the compression or extension directions. This can prevent flying stones from coming into contact with the piston rod 17, thereby improving the protection performance of the piston rod 17.
  • shock absorber according to the present invention has been described using the rear cushion of a saddle-ride vehicle as an example, it can also be applied to the front fork of a saddle-ride vehicle or a shock absorber for a passenger car, and is not limited to these types.
  • the shock absorber of the present invention is suitable for use as a rear cushion in saddle-ride vehicles.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

L'invention concerne un amortisseur (10 ; 10A) comprenant : un cylindre (12) ; une tige de piston (17) qui est disposée de façon à pouvoir se mettre en mouvement vers l'avant et vers l'arrière par rapport au cylindre (12) lorsqu'une force dans une direction de compression ou une direction d'extension lui est appliquée ; un piston (18) qui peut être déplacé conjointement avec la tige de piston (17) ; une partie bride (21) qui s'étend dans la direction radiale depuis l'autre extrémité de la tige de piston (17) ; un élément élastique (15) qui est fixé à une partie du cylindre (12) à travers laquelle pénètre la tige de piston (17), qui vient en butée sur la partie bride (21) lorsque la tige de piston (17) atteint la limite avant, et qui se déforme élastiquement ; et une partie paroi externe (32) qui recouvre au moins une partie d'une surface périphérique externe de l'élément élastique (15).
PCT/JP2024/024017 2024-07-03 2024-07-03 Amortisseur Pending WO2026009338A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2024/024017 WO2026009338A1 (fr) 2024-07-03 2024-07-03 Amortisseur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2024/024017 WO2026009338A1 (fr) 2024-07-03 2024-07-03 Amortisseur

Publications (1)

Publication Number Publication Date
WO2026009338A1 true WO2026009338A1 (fr) 2026-01-08

Family

ID=98318133

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/024017 Pending WO2026009338A1 (fr) 2024-07-03 2024-07-03 Amortisseur

Country Status (1)

Country Link
WO (1) WO2026009338A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002054677A (ja) * 2000-08-09 2002-02-20 Showa Corp 油圧緩衝器とそのばね荷重調整方法
JP2002155983A (ja) * 2000-11-20 2002-05-31 Honda Motor Co Ltd 車両のサスペンションにおける油圧緩衝器の取付け構造
JP2002310218A (ja) * 2001-04-11 2002-10-23 Honda Access Corp 車両用ダンパのバンプストッパ装置
JP2009030731A (ja) * 2007-07-27 2009-02-12 Nissan Motor Co Ltd ショックアブソーバ
JP2019074463A (ja) * 2017-10-18 2019-05-16 株式会社ショーワ ストロークセンサシステムおよび緩衝器
JP7301234B2 (ja) * 2020-07-07 2023-06-30 本田技研工業株式会社 ラバー構造

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002054677A (ja) * 2000-08-09 2002-02-20 Showa Corp 油圧緩衝器とそのばね荷重調整方法
JP2002155983A (ja) * 2000-11-20 2002-05-31 Honda Motor Co Ltd 車両のサスペンションにおける油圧緩衝器の取付け構造
JP2002310218A (ja) * 2001-04-11 2002-10-23 Honda Access Corp 車両用ダンパのバンプストッパ装置
JP2009030731A (ja) * 2007-07-27 2009-02-12 Nissan Motor Co Ltd ショックアブソーバ
JP2019074463A (ja) * 2017-10-18 2019-05-16 株式会社ショーワ ストロークセンサシステムおよび緩衝器
JP7301234B2 (ja) * 2020-07-07 2023-06-30 本田技研工業株式会社 ラバー構造

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