WO2023119372A1 - フロントフォーク - Google Patents

フロントフォーク Download PDF

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Publication number
WO2023119372A1
WO2023119372A1 PCT/JP2021/047059 JP2021047059W WO2023119372A1 WO 2023119372 A1 WO2023119372 A1 WO 2023119372A1 JP 2021047059 W JP2021047059 W JP 2021047059W WO 2023119372 A1 WO2023119372 A1 WO 2023119372A1
Authority
WO
WIPO (PCT)
Prior art keywords
stopper
front fork
ring
cap
adjuster
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/JP2021/047059
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
修 宮崎
渓 須崎
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.)
KYB Motorcycle Suspension Co Ltd
Original Assignee
KYB Motorcycle Suspension Co 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 KYB Motorcycle Suspension Co Ltd filed Critical KYB Motorcycle Suspension Co Ltd
Priority to CN202180100793.2A priority Critical patent/CN118354955A/zh
Priority to JP2023568780A priority patent/JP7602669B2/ja
Priority to PCT/JP2021/047059 priority patent/WO2023119372A1/ja
Priority to US18/292,583 priority patent/US20240343338A1/en
Priority to DE112021008534.4T priority patent/DE112021008534T5/de
Publication of WO2023119372A1 publication Critical patent/WO2023119372A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDECARS, FORECARS, OR THE LIKE
    • B62K25/00—Axle suspensions
    • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
    • B62K25/06—Axle suspensions for mounting axles resiliently on cycle frame or fork with telescopic fork, e.g. including auxiliary rocking arms
    • B62K25/08—Axle suspensions for mounting axles resiliently on cycle frame or fork with telescopic fork, e.g. including auxiliary rocking arms for front wheel
    • 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
    • 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
    • F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
    • 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
    • F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
    • F16F9/46—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall
    • F16F9/461—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall characterised by actuation means
    • F16F9/462—Rotary actuation means
    • 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
    • F16F9/56—Means for adjusting the length of, or for locking, the spring or damper, e.g. at the end of the stroke
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDECARS, FORECARS, OR THE LIKE
    • B62K25/00—Axle suspensions
    • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
    • B62K2025/045—Suspensions with ride-height adjustment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDECARS, FORECARS, OR THE LIKE
    • B62K25/00—Axle suspensions
    • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
    • B62K2025/048—Axle suspensions for mounting axles resiliently on cycle frame or fork with suspension manual adjustment details
    • 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
    • F16F9/34—Special valve constructions; Shape or construction of throttling passages
    • F16F9/342—Throttling passages operating with metering pins
    • 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
    • F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
    • F16F9/46—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall
    • F16F9/466—Throttling control, i.e. regulation of flow passage geometry
    • F16F9/469—Valves incorporated in the piston

Definitions

  • the present invention relates to front forks.
  • Some front forks that support the front wheels of saddle-riding vehicles exhibit damping force by being interposed between the vehicle body and the front wheel axle of the saddle-riding vehicle.
  • a front fork comprises a telescopic fork body having a body side tube connected to the body of a straddle vehicle and an axle side tube fitted to the body side tube and connected to the front wheel axle, and a cylinder. and a damper cartridge that is housed in the fork body and exerts a damping force as the fork body expands and contracts, and a suspension spring that biases the damper cartridge and the fork body to extend. It is common to be
  • the front fork described above is provided with an adjuster for adjusting the support position of the upper end of the suspension spring in the cap that closes the upper end of the tube on the vehicle body side so that the user can adjust the vehicle height of the saddle-riding vehicle to a desired vehicle height.
  • an adjuster for adjusting the support position of the upper end of the suspension spring in the cap that closes the upper end of the tube on the vehicle body side so that the user can adjust the vehicle height of the saddle-riding vehicle to a desired vehicle height.
  • the cap has an annular lid portion screwed onto a female screw portion formed on the inner circumference of the tube on the vehicle body side, and a cylindrical portion hanging down from the inner circumference of the lid portion and having a side opening.
  • the lower end of the tubular portion is connected to the rod of the damper cartridge, and a threaded portion is provided on the inner periphery of the tubular portion above the opening.
  • the adjuster has a male threaded portion that is screwed into the female threaded portion of the tubular portion from the tip to the center on the outer circumference, and enters and exits the tubular portion in the manner of a feed screw by the user's rotational operation.
  • a C-ring is attached to the outer periphery of the tip of the adjuster.
  • a spring support that includes a body portion that is inserted into the tubular portion, and a spring support portion that extends from the main body portion and protrudes from the opening of the tubular portion to the outside of the tubular portion and supports the upper end of the suspension spring.
  • the lower end of the adjuster is in contact with the main body of the spring support. Therefore, when the user rotates the adjuster, the adjuster moves up and down with respect to the cap, and the spring support follows the up and down movement of the adjuster to change the support position of the upper end of the suspension spring, thereby increasing the vehicle height of the saddle-riding vehicle. adjustments are made.
  • a structure is adopted in which a screw hole is provided in the main body of the spring retainer, the spring retainer is screwed into the male thread of the adjuster, and only the spring retainer is moved up and down with respect to the cap in the manner of a feed screw by rotating the adjuster. is desired.
  • a structure is adopted in which a flange is provided on the outer periphery of the adjuster, the cap is composed of two parts, and one of the parts constituting the cap supports the flange of the adjuster from above to prevent the adjuster from coming off. .
  • the cap 100 includes an outer cylinder 101a screwed onto the inner circumference of the vehicle body side tube 50, an inner cylinder 101b having a male screw portion 101c on the outer circumference, an outer cylinder 101a, and an inner cylinder 101a. It is composed of a cover member 101 having an annular plate 101d connected to the cylinder 101b, and a cylinder member 102 screwed to the outer circumference of the inner cylinder 101b of the lid member 101 and connected to the upper end of the rod 51. .
  • the adjuster 103 has a flange 103b on the outer periphery of the intermediate portion and above the male screw portion 103a, and is rotatably inserted into the inner cylinder 101b of the cover member 101.
  • the flange 103b of the adjuster 103 is in contact with the stepped portion 101e formed on the inner circumference of the inner cylinder 101b, and is brought into contact with the stepped portion 101e of the inner cylinder 101b by the elastic force of the suspension spring 52. maintained.
  • a male screw portion 103a of the adjuster 103 has a screw hole and is screwed into a spring receiver 104 that supports the upper end of the suspension spring 52. Rotation of the adjuster 103 causes the spring receiver 104 to move vertically.
  • the adjuster 103 does not move up and down with respect to the cap 100, so it can be used without difficulty in a saddle-riding vehicle with a layout in which the handlebars, gauges, etc. are arranged directly above the front fork.
  • the cap 100 is composed of two parts, the cover member 101 and the cylinder member 102, and these parts are connected by screwing. It is necessary to secure an overlap margin at the screw fastening portion with the tube 101b.
  • the opening 102a provided in the cylindrical member 102 through which the spring support portion 104a of the spring receiver 104 is inserted must be provided so as to avoid the threaded portion 102b of the cylindrical member 102. As a result, the support position of the suspension spring 52 of the spring bearing 104 is shifted downward accordingly.
  • the axial length (storage length) of the space in which the suspension spring 52 is installed is shortened accordingly. If the retracted length is shortened, there arises a problem that the degree of freedom in designing the suspension spring 52 is reduced accordingly.
  • an object of the present invention is to provide a front fork that can shorten the overall length of the cap and improve the degree of freedom in designing the suspension spring.
  • the front fork of the present invention has a tube member in which a vehicle body side tube and an axle side tube are slidably fitted together, and a suspension spring that biases the tube member in an extending direction. It has a main body, a cylindrical portion that is inserted into the vehicle body side tube and has an opening on the side portion on the tip side, and an annular lid portion that continues to the outer periphery of the cylindrical portion and is attached to the end portion of the vehicle body side tube.
  • a cap that closes the open end of the vehicle-body-side tube, a ring-shaped nut portion that is inserted into the cylindrical portion and has a threaded portion on the inner circumference, and a nut portion that extends from the outer periphery of the nut portion and extends out of the cylindrical portion through the opening.
  • a washer having an arm portion that protrudes and supports the upper end of the suspension spring; a shaft portion having a screw groove formed on the outer periphery thereof to be screwed into the nut portion; a flange portion provided at the rear end of the shaft portion; and an operating shaft portion extending from the side opposite to the shaft portion of the flange portion and having an operating portion at its tip end.
  • a stopper member mounted on the inner periphery of the cylindrical portion of the cap and abutting against the side of the flange portion opposite to the shaft portion to prevent the adjuster from coming off the cap. It is configured.
  • the cap is composed of only one part instead of two parts, and there is no screw fastening portion for screwing the two parts together. can be placed higher than the conventional front fork.
  • the support position of the upper end of the suspension spring supported by the arm of the washer is displaced upward compared to the conventional front fork. can be shortened, and the storage length in the space for installing the suspension spring in the front fork can be lengthened.
  • FIG. 1 is a longitudinal sectional view of a front fork according to an embodiment of the invention.
  • FIG. 2 is an enlarged longitudinal sectional view of the upper end of the front fork according to the embodiment of the invention.
  • FIG. 3 is an enlarged longitudinal sectional view of the upper end of the front fork in the first modified example of the embodiment of the invention.
  • FIG. 4 is an enlarged longitudinal sectional view of the upper end of the front fork in the second modification of the embodiment of the invention.
  • FIG. 5 is an enlarged longitudinal sectional view of the upper end of the front fork in the third modification of the embodiment of the invention.
  • FIG. 6 is an enlarged longitudinal sectional view of the upper end of a conventional front fork.
  • the front fork 1 of the present invention biases the tube member 3 and the tube member 3 in which the vehicle body side tube 3a and the axle side tube 3b are slidably fitted and the tube member 3 is extended.
  • a fork body 2 having a suspension spring 4;
  • a cap 5 having a tubular portion 5a and a lid portion 5b and closing an open end 3a1 of the vehicle body side tube 3a;
  • a washer 6 inserted into the tubular portion 5a;
  • the adjuster 7 is inserted into the cylindrical portion 5a and screwed onto the washer 6, and a stopper member 8 prevents the adjuster 7 from coming off the cap 5.
  • a stopper member 8 prevents the adjuster 7 from coming off the cap 5.
  • the fork body 2 includes a tube member 3, a suspension spring 4, and a damper cartridge 10 that expands and contracts as the tube member 3 expands and contracts to exhibit damping force.
  • the tube member 3 is inserted into a vehicle body side tube 3a arranged on the upper side and connected to the vehicle body of a straddle vehicle (not shown) and a vehicle body side tube 3a arranged on the lower side and having a smaller diameter than the vehicle body side tube 3a. and an axle-side tube 3b.
  • the tube member 3 expands and contracts when the vehicle body side tube 3a and the axle side tube 3b move relative to each other in the axial direction.
  • the upper end of the vehicle body side tube 3a is closed by a cap 5, and the lower end of the axle side tube 3b is closed by a bottom cap 11 for gripping the axle of the front wheel of a straddle vehicle (not shown).
  • Annular bearings 12 and 13 are provided between the vehicle body side tube 3a and the axle side tube 3b, so that the vehicle body side tube 3a and the axle side tube 3b can move smoothly in the axial direction.
  • annular sealing member 14 is provided on the inner circumference of the lower end of the vehicle body side tube 3a so as to be in sliding contact with the outer circumference of the axle side tube 3b, so that the inner space of the tube member 3 is sealed.
  • the damper cartridge 10 expands and contracts along with the expansion and contraction of the tube member 3 to exhibit damping force.
  • the damper cartridge 10 includes a cylinder 10a fixed to a bottom cap 11 that closes the lower end opening of the axle-side tube 3b, and an extension-side chamber R1 that is slidably inserted into the cylinder 10a and filled with liquid inside the cylinder 10a. and a piston rod 10c connected to the piston 10b and inserted into the cylinder 10a so as to be axially movable and connected to a cap 5 closing the upper end opening of the vehicle body side tube 3a.
  • the annular gap formed between the damper cartridge 10 and the tube member 3 is used as a reservoir R filled with liquid and gas, and this reservoir R communicates with the compression side chamber R2 through a hole (not shown) provided in the cylinder 10a.
  • the liquid corresponding to the volume of the piston rod 10c that moves in and out of the cylinder 10a in the cylinder 10a during expansion and contraction is displaced in the cylinder 10a is exchanged between the cylinder 10a and the reservoir R to compensate for the volume.
  • the liquid hydraulic oil can be used, and any liquid that can exert a damping force can be used.
  • the piston 10b has an annular shape and includes an expansion side port 10b1 and a compression side port 10b2 that communicate the expansion side chamber R1 and the compression side chamber R2.
  • An annular expansion side leaf valve 10d that opens and closes the expansion side port 10b1 is stacked on the lower end of the piston 10b in FIG.
  • a valve 10e is stacked.
  • the piston 10b, the expansion side leaf valve 10d and the compression side leaf valve 10e are all mounted on the outer periphery of a piston connecting member 10f connected to the lower end of the piston rod 10c in FIG.
  • the expansion side leaf valve 10d and the compression side leaf valve 10e are fixed to the piston rod 10c on the inner peripheral side, and when the outer peripheral side is bent and separated from the piston 10b, the corresponding expansion side port 10b1 and compression side port 10b2 are opened.
  • the piston rod 10c has a tubular shape, and the upper end in FIG. 1 is connected to the cap 5 by screwing.
  • a piston connecting member 10f connected to the lower end of the piston rod 10c in FIG. 1 has a cylindrical shape, and has the piston 10b, the expansion side leaf valve 10d, and the compression side leaf valve 10e mounted on the outer circumference.
  • a bypass B is formed that bypasses the port 10b1 and the compression side port 10b2 and connects the growth side chamber R1 and the compression side chamber R2.
  • a needle valve 10g is inserted inside the piston connecting member 10f so as to be axially movable. The needle valve 10g increases or decreases the flow area of the bypass B as it moves axially within the piston connecting member 10f.
  • a cylindrical rod guide 10h into which the piston rod 10c is slidably inserted is attached to the inner circumference of the upper end of the cylinder 10a.
  • the rod guide 10h serves not only to guide the axial movement of the piston rod 10c, but also to function as a spring support for supporting the lower end of the suspension spring 4.
  • the oil lock piece provided on the outer circumference of the piston rod 10c in the middle. It also functions as an oil lock case that suppresses further contraction of the damper cartridge 10 and the fork body 2 due to the intrusion of the oil 10i.
  • an adjusting rod 15 is inserted into the piston rod 10c so as to be axially movable. As shown in FIG. 1, the lower end of the adjusting rod 15 is in contact with the upper end of the needle valve 10g. When the adjusting rod 15 is moved up and down, the needle valve 10g is also moved up and down to adjust the flow area in the bypass B. can. It should be noted that what is provided in the bypass B is not limited to the needle valve 10g, and a variable damping valve that can be displaced by the adjusting rod 15 in the bypass B to vary the flow path area or the valve opening pressure can be used. .
  • the damper cartridge 10 when the fork body 2 extends, the damper cartridge 10 also extends, and the extension side chamber R1 is compressed by the piston 10b. Then, when the extension speed of the fork body 2 is low and the pressure in the extension side chamber R1 does not reach the opening of the extension side leaf valve 10d, the needle valve 10g is opened, and the extension side chamber R1 liquid moves through the bypass B to the pressure-side chamber R2. Since the needle valve 10g gives resistance to this liquid flow, a pressure difference occurs between the expansion side chamber R1 and the compression side chamber R2, and the front fork 1 exerts a damping force that suppresses the expansion operation.
  • the pressure in the extension side chamber R1 opens the extension side leaf valve 10d, and the needle valve 10g is opened, the liquid in the extension side chamber R1 is It moves to the pressure side chamber R2 not only through the bypass B but also through the expansion side port 10b1. Since the needle valve 10g and the extension-side leaf valve 10d provide resistance to this liquid flow, a pressure difference occurs between the extension-side chamber R1 and the compression-side chamber R2, and the front fork 1 exerts a damping force that suppresses the extension operation. Demonstrate.
  • the opening degree of the needle valve 10g can be changed by moving the adjusting rod 15 in the axial direction, it is possible to adjust the characteristics of the damping force on the extension side of the front fork 1 (the characteristics of the damping force with respect to the extension/retraction speed).
  • the damper cartridge 10 when the fork body 2 contracts, the damper cartridge 10 also contracts, and the compression side chamber R2 is compressed by the piston 10b.
  • the contraction speed of the fork body 2 is low and the pressure in the pressure-side chamber R2 does not reach the opening pressure of the pressure-side leaf valve 10e, when the needle valve 10g is open, the pressure in the pressure-side chamber R2 The liquid moves through the bypass B to the growth side chamber R1. Since the needle valve 10g gives resistance to this liquid flow, a pressure difference occurs between the pressure side chamber R2 and the expansion side chamber R1, and the front fork 1 exerts a damping force that suppresses the contraction operation.
  • the displacement of the needle valve 10g is adjusted by the adjustment rod 15 to increase or decrease the passage area of the bypass passage B, thereby adjusting the compression side damping force of the front fork 1.
  • the cap 5 includes a cylindrical portion 5a that is inserted into the vehicle body side tube 3a and has an opening on the side portion on the tip side, and an end portion of the vehicle body side tube 3a that is connected to the outer periphery of the cylindrical portion 5a. and an annular lid portion 5b attached to the housing.
  • the cylindrical portion 5a has a bottomed cylindrical shape, and has a small-diameter portion 5a2 formed at its lower end with an inner diameter smaller than that of the intermediate portion 5a1, and a large-diameter portion formed at its upper end with an inner diameter larger than that of the intermediate portion 5a1. 5a3.
  • a thread groove is formed on the inner periphery of the small diameter portion 5a2, and a thread groove provided on the outer periphery of the upper end of the piston rod 10c of the damper cartridge 10 is screwed therewith.
  • a nut 18 is screwed into the screw groove on the outer periphery of the upper end of the piston rod 10c and is in contact with the lower end of the cylindrical portion 5a. The fastening between the cylindrical portion 5a and the piston rod 10c is made strong.
  • the large-diameter portion 5a3 has a hexagonal gripping portion 5a4 that can be gripped by a tool on the outer circumference of the upper end, and has an annular groove 5a5 on the inner circumference along the circumferential direction. Furthermore, a pair of rectangular openings 5a6 facing each other with a phase difference of 180 degrees are provided in the intermediate portion 5a1 of the cylindrical portion 5a.
  • the lid portion 5b protrudes in a flange shape from the side near the upper end of the cylindrical portion 5a toward the outer peripheral side, and has a screw portion 5b1 on the outer periphery.
  • the cover portion 5b is connected to the vehicle body side tube 3a by screwing an outer peripheral screw portion 5b1 into a screw portion 3a2 formed on the inner periphery of the upper open end 3a1 of the vehicle body side tube 3a.
  • a seal ring 17 is attached to the inner periphery of the vehicle body side tube 3a on the outer periphery of the lid portion 5b and above the screw portion 5b1 to seal the gap between the cap 5 and the vehicle body side tube 3a. ing.
  • the washer 6 includes an annular nut portion 6a having a thread groove 6a1 on its inner periphery, and a pair of arm portions extending from the outer periphery of the nut portion 6a and projecting out of the cylindrical portion 5a through an opening 5a6 in the cylindrical portion 5a. 6b.
  • the washer 6 is vertically movable with respect to the cap 5 within the range in which the arm portion 6b can be vertically moved within the opening 5a6 within the tubular portion 5a.
  • the arm portion 6b of the washer 6 is slidably inserted into the opening 5a6 of the tubular portion 5a. Directional rotation is restricted.
  • a cylindrical spacer 19 fitted to the upper end of the suspension spring 4 is arranged on the outer circumference of the cylindrical portion 5a, and a spacer 20 is laminated on the upper end of the spacer 19 so as to be rotatable with respect to the spacer 19. It is The arm portion 6 b of the washer 6 is in contact with the upper end of the spacer 20 and supports the upper end of the suspension spring 4 via the spacer 19 and the spacer 20 .
  • the suspension spring 4 is interposed between the rod guide 10h of the damper cartridge 10 and the washer 6 in a compressed state.
  • the adjuster 7 has a cylindrical shape as a whole, and includes a lower shaft portion 7a, a flange portion 7b provided on the outer periphery of the upper end in FIG.
  • the operating shaft portion 7c is inserted into the cylindrical portion 5a of the cap 5 so as to be rotatable in the circumferential direction.
  • a screw groove 7a1 is formed on the outer periphery of the shaft portion 7a to be screwed into the nut portion 6a of the washer 6.
  • the flange portion 7b is provided from the upper end of the shaft portion 7a toward the outer peripheral side in FIG. An end surface 7b2 on the upper side in FIG.
  • the operating shaft portion 7c has an operating portion 7c1 that extends upward from the upper end side in FIG.
  • the operating portion 7c1 protrudes from the tubular portion 5a and is exposed to the outside of the front fork.
  • the adjuster 7 configured in this way can be inserted into the cylindrical portion 5a of the cap 5 from the shaft portion 7a side and rotated with respect to the cap 5 in the circumferential direction. Therefore, the user can easily rotate the adjuster 7 by gripping the operation portion 7c1 using a tool.
  • the outer peripheral shape of the operating portion 7c1 is hexagonal, but any shape other than the hexagonal shape may be used as long as it is suitable for gripping the tool.
  • a screw groove 7d is provided on the inner periphery of the adjuster 7.
  • An operator 22 is rotatably inserted into the inner circumference of the adjuster 7 so as to contact the upper end of the adjusting rod 15 in FIG. 2, the manipulator 22 has a threaded portion 22a to be screwed into the threaded groove 7d on the outer circumference of the lower end thereof. move up and down, which is the axial direction.
  • a seal ring 23 attached to the outer periphery of the operator 22 seals between the operator 22 and the adjuster 7 .
  • the stopper member 8 is mounted on the inner circumference of the large-diameter portion 5a3 of the cylindrical portion 5a of the cap 5, and is in contact with the end surface 7b2 of the flange portion 7b of the adjuster 7 on the side opposite to the shaft portion. Prevents escape from Thus, the stopper member 8 is attached to the inner circumference of the upper open end of the tubular portion 5 a of the cap 5 .
  • the stopper member 8 includes a C-shaped ring 8a inserted into an annular groove 5a5 provided in the inner periphery of the large diameter portion 5a3 of the cylindrical portion 5a, and an annular cylindrical portion 5a and an operating shaft portion 7c.
  • a stopper 8b is inserted between the cylindrical portion 5a and the ring 8a to restrict the upward movement of the cylindrical portion 5a, and the stopper 8b abuts on the end surface 7b2 of the flange portion 7b on the side opposite to the shaft portion.
  • the outer diameter of the ring 8a is set to be equal to or greater than the diameter of the bottom portion of the annular groove 5a5 of the tubular portion 5a. When it is inserted into the groove 5a5, it expands due to the restoring force that tends to expand its outer diameter, and is fixed in the annular groove 5a5.
  • the stopper 8b is an annular component having a rectangular cross section, and is insertable into an annular gap between the large diameter portion 5a3 of the tubular portion 5a and the operating shaft portion 7c of the adjuster 7, and is configured to be inserted between the large diameter portion 5a3 and the operating shaft portion 7c. It is in sliding contact with both the shaft portion 7c. Further, the stopper 8b has an annular recess 8b1 that accommodates the ring 8a on its outer circumference. Furthermore, the axial length of the stopper 8b is shorter than the axial length of the large diameter portion 5a3.
  • the annular concave portion 8b1 includes a first groove portion 8b11 having an inner diameter smaller than the inner diameter of the ring 8a and having a depth equal to or greater than the wire diameter of the ring 8a, and and a second groove portion 8b12 having a depth smaller than the wire diameter of the ring 8a.
  • the first groove portion 8b11 has an axial width equal to or greater than the wire diameter of the ring 8a, and can completely accommodate the ring 8a.
  • the axial width of the second groove portion 8b12 is preferably set to a width equal to or more than half the wire diameter of the ring 8a.
  • the axial width of the second groove portion 8b12 is set to be at least half the wire diameter of the ring 8a, the outermost circumference of the ring 8a will remain in the second groove portion even if an external force is applied to reduce the diameter of the ring 8a. It can be supported by the bottom of 8b12, and can effectively suppress the diameter reduction of the ring 8a.
  • the stopper 8b is prevented from coming off from the cylindrical portion 5a by the ring 8a that is mounted in the annular groove 5a5 of the large-diameter portion 5a3 of the cylindrical portion 5a and that is arranged in the second groove portion 8b12 of the annular concave portion 8b1.
  • the lower end surface of the stopper 8b is a smooth orthogonal surface perpendicular to the axis of the adjuster 7, and when it contacts the end surface 7b2 of the flange portion 7b on the side opposite to the shaft portion, it allows the adjuster 7 to rotate smoothly. While supporting the flange portion 7b, the adjuster 7 is prevented from coming off from the cylinder portion 5a.
  • the washer 6 is inserted into the tubular portion 5a, and then the adjuster 7 is inserted into the tubular portion 5a to push the shaft portion 7a into the washer 6. is screwed to the nut portion 6a of the .
  • the manipulator 22 is previously attached to the inner periphery of the adjuster 7, and is inserted into the tubular portion 5a together with the adjuster 7 when the adjuster 7 is inserted into the tubular portion 5a.
  • the crack of the ring 8a is widened to increase the diameter while facing the first groove portion 8b11 in the annular recessed portion 8b1 of the stopper 8b, and then the diameter is reduced. Then, the ring 8a is completely accommodated in the first groove portion 8b11 of the stopper 8b.
  • the stopper member 8 in the above state is inserted into the annular gap between the cylindrical portion 5a of the cap 5 and the operating shaft portion 7c of the adjuster 7.
  • the ring 8a is inserted into the large-diameter portion 5a3 of the cylindrical portion 5a together with the stopper 8b, the inner circumference of the large-diameter portion 5a3 prevents the ring 8a from increasing in diameter until it faces the annular groove 5a5. is inserted into the large-diameter portion 5a3 together with the stopper 8b.
  • the degree of insertion of the stopper 8b into the large-diameter portion 5a3 progresses. It enters the annular groove 5a5 and is fixed to the cylindrical portion 5a.
  • the ring 8a is inserted into the annular groove 5a5, the ring 8a abuts against the upper side surface of the first groove portion 8b11 in FIG. 2, and the stopper 8b cannot be further pushed into the cylindrical portion 5a.
  • the stopper member 8 is inserted into the annular gap between the tubular portion 5a and the adjuster 7, the stopper 8b and the flange portion 7b may come into contact with each other.
  • the adjuster 7 supports the upper end of the suspension spring 4 together with the washer 6, the suspension spring 4 contracts according to the degree of penetration of the stopper member 8 into the cylindrical portion 5a, so that the stopper 8b and the flange portion 7b come into contact with each other.
  • the stopper member 8 can be inserted into the cylindrical portion 5a together with the adjuster 7. As shown in FIG.
  • the adjuster 7 and the stopper 8b are pushed upward with respect to the cylindrical portion 5a, and the ring 8a is inserted into the second groove portion 8b12 of the annular recess portion 8b1. Since the depth of the second groove portion 8b12 is less than the wire diameter of the ring 8a, when the ring 8a is inserted into the second groove portion 8b12, the inner periphery of the ring 8a contacts the bottom portion of the second groove portion 8b12. The diameter reduction of the ring 8a is restricted, and the outer circumference of the ring 8a is maintained in a state of protruding radially from the outer circumference of the stopper 8b.
  • the ring 8a when the ring 8a is inserted into the second groove portion 8b12, even if an external force acts on the ring 8a in the direction of reducing the diameter, the ring 8a protrudes in the radial direction from the outer periphery of the stopper 8b to form the annular groove 5a5. It is maintained in a state of being inserted inside the annular groove 5a5 and is prevented from falling out of the annular groove 5a5. Therefore, the stopper member 8 is prevented from coming off from the cylindrical portion 5a, and the adjuster 7 can be prevented from coming off.
  • the adjuster 7 When the stopper member 8 is attached to the cylindrical portion 5a, the adjuster 7 is axially brought into contact with the end surface 7b2 of the flange portion 7b of the adjuster 7 on the side opposite to the shaft portion. positioned in contact.
  • the position where the adjuster 7 is positioned with respect to the cylindrical portion 5a of the cap 5 by the stopper member 8 is the proper position of the adjuster 7 with respect to the cylindrical portion 5a. Since the lower end surface of the stopper 8b and the end surface 7b2 of the flange portion 7b of the adjuster 7 on the side opposite to the shaft portion are perpendicular to the axis of the adjuster 7, the adjuster 7 can be positioned at that position. , and the stopper member 8 prevents it from slipping out of the cylindrical portion 5a.
  • the first groove portion 8b11 in the annular concave portion 8b1 of the stopper 8b of the stopper member 8 may be formed to extend to the upper end of the stopper 8b.
  • An annular pocket is formed between the outer circumference of the In this case, it is preferable to provide an annular lid that covers the pocket to prevent dust from accumulating in the pocket.
  • the suspension spring 4 is interposed between the rod guide 10h of the damper cartridge 10 and the washer 6, and always urges the vehicle body side tube 3a and the axle side tube 3b in a direction to separate them in the axial direction. ing. Therefore, the tube member 3 is urged in the extending direction by the elastic force of the suspension spring 4 .
  • the front fork 1 has the tube member 3 in which the vehicle body side tube 3a and the axle side tube 3b are slidably fitted together, and the suspension spring 4 that biases the tube member 3 in the extension direction.
  • a main body 2 a cylindrical portion 5a which is inserted into the vehicle body side tube 3a and has an opening 5a6 on the side portion on the tip side, and an annular ring connected to the outer periphery of the cylindrical portion 5a and attached to the end portion of the vehicle body side tube 3a.
  • a cap 5 having a lid portion 5b and closing the open end of the vehicle body side tube 3a, an annular nut portion 6a inserted into the cylindrical portion 5a and having a screw portion 6a1 on the inner circumference, and the nut portion 6a.
  • a washer 6 extending from the outer circumference of the cylinder 5a to protrude out of the tubular portion 5a through an opening 5a6 and having an arm portion 6b for supporting the upper end of the suspension spring 4; is formed, a flange portion 7b provided at the rear end of the shaft portion 7a, and an operation shaft portion 7c extending from the side opposite to the shaft portion of the flange portion 7b and having an operation portion 7c1 at its tip.
  • the adjuster 7 which is inserted into the cylindrical portion 5a of the cap 5 from the shaft portion side and is rotatable in the circumferential direction with respect to the cap 5, and has an operating portion 7c1 projecting upward from the cylindrical portion 5a;
  • a stopper member 8 is mounted on the inner periphery of the tubular portion 5a and abuts against the opposite side of the flange portion 7b to prevent the adjuster 7 from coming off the cap 5. As shown in FIG.
  • the cap 5 is composed of only one part instead of two parts, and the stopper member 8 for preventing the adjuster 7 from coming off from the cap 5 is provided inside the cylindrical portion 5a of the cap 5. It is mounted on the periphery and abuts against the side of the flange portion 7b opposite to the shaft portion. Therefore, the cap 5 is not composed of two parts that are screwed together, but is composed of one part and does not have a screw fastening portion for screwing the two parts together.
  • the position of the opening 5a6 through which the 6b is inserted can be arranged higher than in the conventional front fork.
  • the support position on the upper side of the suspension spring 4 supported by the arm portion 6b of the washer 6 is shifted upward compared to the conventional front fork.
  • the overall length of the cap 5 can be shortened accordingly, and the axial length (storage length) of the space in the front fork 1 where the suspension spring 4 is installed can be lengthened.
  • the degree of freedom in setting the design parameters of the suspension spring 4, such as the wire diameter, natural length, and pitch of the suspension spring 4 is improved.
  • the overall length of the cap 5 can be shortened, and the degree of freedom in designing the suspension spring 4 can be improved.
  • the overall length of the cap 5 can be shortened to reduce the weight of the cap 5, so that the weight of the front fork 1 can be reduced.
  • the stopper member 8 is attached to the inner periphery of the open end of the cylindrical portion 5a.
  • the adjuster 7 can be arranged above the cylindrical portion 5a, so that the overall length of the cap 5 can be shortened and the suspension spring 4 can be designed more freely. We can improve further.
  • the stopper member 8 includes a ring 8a inserted into an annular groove 5a5 provided on the inner periphery of the cylindrical portion 5a, and an annular cylindrical portion 5a and an operating shaft portion 7c.
  • a stopper 8b is inserted between the cylindrical portion 5a and the ring 8a restricts upward movement of the tubular portion 5a, and abuts against the side of the flange portion 7b opposite to the shaft portion.
  • the end surface 7b2 of the flange portion 7b of the adjuster 7 on the side opposite to the shaft portion and the end surface of the stopper 8b on the tube body side are in surface contact. It can rotate smoothly.
  • stopper member 8 only needs to be attached to the inner periphery of the tubular portion 5a to prevent the adjuster 7 from slipping out of the tubular portion 5a.
  • the resistance during operation is greater than when the stopper 8b is brought into surface contact with the flange portion 7b.
  • the stopper 8b has an annular recessed portion 8b1 that accommodates the ring 8a on its outer periphery. It has a first groove portion 8b11 having a depth equal to or greater than the diameter, and a second groove portion 8b12 adjacent to the lower side of the first groove portion 8b11 and having a depth less than the wire diameter of the ring 8a.
  • the front fork 1 configured in this manner, when inserting the stopper member 8 into the annular gap between the cylindrical portion 5a and the operating shaft portion 7c, the insertion of the stopper 8b into the annular gap is prevented.
  • the ring 8a can be accommodated in the first groove portion 8b11 so as not to become unbalanced. Further, according to the front fork 1 configured in this manner, after the ring 8a is mounted in the annular groove 5a5, the ring 8a is inserted into the second groove portion 8b12 so that the outer diameter of the ring 8a increases to the large diameter portion 5a3. , the ring 8a can be prevented from falling out of the annular groove 5a5.
  • the inner periphery of the stopper 8b is in sliding contact with the outer periphery of the operating shaft portion 7c, and the outer periphery of the stopper 8b is in sliding contact with the inner periphery of the cylindrical portion 5a.
  • the annular gap between the tubular portion 5a and the adjuster 7 can be filled with the stopper 8b, so that the appearance around the adjuster 7 is improved, and a Intrusion of dust etc. can be prevented.
  • the upper end surface of the stopper 8b and the upper end surface of the cylindrical portion 5a are flush with each other when the ring 8a is inserted into the annular groove 5a5. According to the front fork 1 constructed in this manner, after the stopper member 8 is attached to the cap 5, it is checked whether the upper end surface of the stopper 8b and the upper end surface of the cylindrical portion 5a are flush with each other. Therefore, whether or not the stopper member 8 is assembled incorrectly can be determined from the outside.
  • a chamfered portion 8b2 is provided in a tapered shape on the outer circumference of the upper end of the stopper 8b. It is made to be the same height as Therefore, according to the front fork 1 configured in this way, after the stopper member 8 is attached to the cap 5, the position of the lower end surface of the chamfered portion 8b2 of the stopper 8b and the position of the upper end surface of the cylindrical portion 5a are the same.
  • this position recognizing means is composed of a chamfered portion 8b2 provided on the outer circumference of the upper end of the stopper 8b. It may be a mark provided by engraving, cutting or painting on the outer circumference of the .
  • the stopper member 82 may be an annular part having a rectangular cross section and provided with a threaded portion on the outer periphery thereof, and the threaded portion may be threaded on the inner periphery of the large diameter portion 5a3 of the cylindrical portion 5a. may be provided to screw the stopper member 82 to the tube portion 5a.
  • the stopper member 82 is screwed to the cylindrical portion 5a, it is preferable to provide a part that prevents the stopper member 82 from rotating with respect to the cylindrical portion 5a.
  • the large diameter portion 5a3 is provided in which the diameter of the inner circumference of the upper end of the cylindrical portion 5a of the cap 5 is increased.
  • the large diameter portion 5a3 may be omitted.
  • the seal ring 21 attached to the outer periphery of the flange portion 7b of the adjuster 7 must not come into contact with the large-diameter portion 5a3 when the adjuster 7 is inserted into the cylindrical portion 5a. Therefore, the work of inserting the adjuster 7 into the cylindrical portion 5a is facilitated.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)
PCT/JP2021/047059 2021-12-20 2021-12-20 フロントフォーク Ceased WO2023119372A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202180100793.2A CN118354955A (zh) 2021-12-20 2021-12-20 前叉
JP2023568780A JP7602669B2 (ja) 2021-12-20 2021-12-20 フロントフォーク
PCT/JP2021/047059 WO2023119372A1 (ja) 2021-12-20 2021-12-20 フロントフォーク
US18/292,583 US20240343338A1 (en) 2021-12-20 2021-12-20 Front fork
DE112021008534.4T DE112021008534T5 (de) 2021-12-20 2021-12-20 Vordergabel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/047059 WO2023119372A1 (ja) 2021-12-20 2021-12-20 フロントフォーク

Publications (1)

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WO2023119372A1 true WO2023119372A1 (ja) 2023-06-29

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US (1) US20240343338A1 (https=)
JP (1) JP7602669B2 (https=)
CN (1) CN118354955A (https=)
DE (1) DE112021008534T5 (https=)
WO (1) WO2023119372A1 (https=)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0325040U (https=) * 1989-07-21 1991-03-14
JPH0514693U (ja) * 1991-08-09 1993-02-26 カヤバ工業株式会社 油圧緩衝器のばね荷重調整装置
JP2002161937A (ja) * 2000-11-22 2002-06-07 Showa Corp フロントフォークのばね荷重調整装置
JP2009168206A (ja) * 2008-01-18 2009-07-30 Kayaba Ind Co Ltd アジャスタ構造
JP2009299833A (ja) * 2008-06-16 2009-12-24 Kayaba Ind Co Ltd フロントフォーク
JP2013122256A (ja) * 2011-12-09 2013-06-20 Kyb Co Ltd 懸架装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02105626U (https=) * 1989-02-10 1990-08-22
JP4703897B2 (ja) * 2001-06-28 2011-06-15 カヤバ工業株式会社 フロントフォーク
JP2003090379A (ja) * 2001-09-17 2003-03-28 Kayaba Ind Co Ltd フロントフォーク
JP5613028B2 (ja) 2010-11-25 2014-10-22 カヤバ工業株式会社 アジャスタ構造

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0325040U (https=) * 1989-07-21 1991-03-14
JPH0514693U (ja) * 1991-08-09 1993-02-26 カヤバ工業株式会社 油圧緩衝器のばね荷重調整装置
JP2002161937A (ja) * 2000-11-22 2002-06-07 Showa Corp フロントフォークのばね荷重調整装置
JP2009168206A (ja) * 2008-01-18 2009-07-30 Kayaba Ind Co Ltd アジャスタ構造
JP2009299833A (ja) * 2008-06-16 2009-12-24 Kayaba Ind Co Ltd フロントフォーク
JP2013122256A (ja) * 2011-12-09 2013-06-20 Kyb Co Ltd 懸架装置

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CN118354955A (zh) 2024-07-16
JP7602669B2 (ja) 2024-12-18
US20240343338A1 (en) 2024-10-17
DE112021008534T5 (de) 2024-10-31
JPWO2023119372A1 (https=) 2023-06-29

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