WO2002058988A1 - Maitre-cylindre pour vehicules a commande par leviers a main - Google Patents

Maitre-cylindre pour vehicules a commande par leviers a main Download PDF

Info

Publication number
WO2002058988A1
WO2002058988A1 PCT/IT2001/000032 IT0100032W WO02058988A1 WO 2002058988 A1 WO2002058988 A1 WO 2002058988A1 IT 0100032 W IT0100032 W IT 0100032W WO 02058988 A1 WO02058988 A1 WO 02058988A1
Authority
WO
WIPO (PCT)
Prior art keywords
axis
plane
handlebar
seat
control lever
Prior art date
Application number
PCT/IT2001/000032
Other languages
English (en)
Inventor
Roberto Lavezzi
Original Assignee
Freni Brembo S.P.A.
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 Freni Brembo S.P.A. filed Critical Freni Brembo S.P.A.
Priority to PCT/IT2001/000032 priority Critical patent/WO2002058988A1/fr
Publication of WO2002058988A1 publication Critical patent/WO2002058988A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16—Master control, e.g. master cylinders
    • B60T11/165—Single master cylinders for pressurised systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
    • B62L3/00—Brake-actuating mechanisms; Arrangements thereof
    • B62L3/02—Brake-actuating mechanisms; Arrangements thereof for control by a hand lever
    • B62L3/023—Brake-actuating mechanisms; Arrangements thereof for control by a hand lever acting on fluid pressure systems

Definitions

  • the subject of the present invention is a master cylinder for vehicles controllable by means of handlebars, comprising a cylinder body having a seat, extending along an axis, for housing a portion of the handlebar, the seat having a side which is intended to face a hand grip of the handlebar and the cylinder body projecting from the seat, away from the handlebar as far as at least one operative connection between a control lever and a piston housed in the cylinder body. More particularly, the invention relates to a master cylinder for motor-vehicle brakes or clutches.
  • the brake generally associated with the front wheel is operated by means of a master cylinder mounted on the handlebars in the vicinity of one of the hand grips, conventionally the right-hand hand grip of the motor cycle.
  • the clutch can also be operated by means of a master cylinder mounted on the handlebars on the opposite side to the brake-operating cylinder, that is, on the left-hand side of the motor cycle.
  • a master cylinder of the type described above is generally constituted by a cylinder body in which a chamber is formed for housing a piston.
  • the piston When the piston is operated by the driver, it acts on a working fluid contained in the respective brake or clutch system.
  • the chamber is arranged in communication with a reservoir which holds the working fluid and may be formed integrally with the cylinder body or may be separate and connected thereto by an external pipe.
  • a master cylinder of the above-mentioned type also has a control lever which is mounted for pivoting on the cylinder body and is intended to act on the piston.
  • the control lever faces a hand grip of the handlebar and is operated by the driver by being pivoted about its fulcrum.
  • the axis along which the chamber housing the piston extends which is also defined as the axis of the cylinder, generally lies in the plane defined by the pivoting of the control lever, or in a plane parallel thereto.
  • the axis of the cylinder is arranged perpendicular to the axis of the portion of the handlebar to which the cylinder is fixed and is therefore perpendicular to the axis of the seat in the cylinder body which is clamped onto the handlebar.
  • the cylinder In the field of mass-produced motor cycles, the cylinder cannot be mounted immediately adjacent the hand-grip since other devices are fitted between the hand-grip and the point where the cylinder is fixed to the handlebar, these devices being constituted, for example, by the electrical controls fitted between the hand-grip and the brake cylinder. In the field of mass-produced motor cycles, these requirements are therefore even more marked.
  • the lever ratios used are generally designed to achieve an optimal compromise between braking action and sensitivity of operation by the driver, in mass-produced motor cycles, the excessive length of the portion of the lever which faces the hand grip adversely affects sensitivity of operation by the driver.
  • the need to place the control lever in a position remote from the hand grip introduces a problem of bulkiness, which is particularly noticeable with cylinders having axes perpendicular to the axis of the seat for housing the handlebar.
  • the problem underlying the present invention is therefore to propose a master cylinder for vehicles controllable by means of handlebars which has structural and functional characteristics such as to satisfy the above-mentioned requirements and at the same time to prevent the problems mentioned with reference to the prior art.
  • This problem is solved by a master cylinder for vehicles controllable by means of handlebars according to Claim 1.
  • Figure 1 is a side view of a cylinder according to the present invention
  • Figure 2 shows the cylinder of Figure 1, mounted on a portion of a handlebar and partially sectioned in a plane II-II of Figure 1.
  • a master cylinder generally indicated 1, comprises a cylinder body 2.
  • the cylinder body 2 is formed as a unitary element extended by a yoke 3 and a handlebar seat 4.
  • a reservoir 5 which, in the embodiment illustrated, is formed as an element separate from the cylinder body 2, whereas in other embodiments, not shown, it may be formed integrally with the cylinder body 2.
  • a possible reference system relative to the master cylinder 1 can be obtained by means of a vertical axis V and a horizontal plane P, shown in Figure 1 and defined as stated below.
  • the reservoir in fact contains a working fluid, this definition being intended to define any type of fluid suitable for use in braking or clutch systems, for example, for use in vehicles controllable by means of handlebars.
  • This fluid is disposed in the reservoir, defining a free surface which, since it is subject to the effect of gravity, is arranged in a horizontal plane.
  • Figure 1 shows a horizontal plane P parallel to the horizontal plane corresponding to the free surface of the fluid in the reservoir.
  • the reservoir is mounted on a motor-vehicle handlebar in a manner such that its walls are substantially perpendicular to the horizontal plane defined by the free surface of the fluid.
  • a vertical axis V perpendicular to the horizontal plane P is therefore defined.
  • a first, upwardly-directed vector V can be defined along this vertical axis V, this definition meaning a vector directed away from the free surface of the fluid, generally towards the opening of the reservoir.
  • a second, downward vector V ' is defined along the vertical axis V, this definition meaning a vector which is directed from the free surface of the fluid, into the fluid, generally towards the bottom of the reservoir.
  • the first vector V consequently defines an upper half- space and the second vector V ' defines a lower half- space.
  • a control lever 6 is mounted for pivoting at a point A of the yoke 3 and faces an end portion of a handlebar 7 of the motor vehicle, in particular, a hand grip 8 to be gripped by the driver.
  • the control lever 6 is advantageously formed in two portions ⁇ a, 6b.
  • the first portion 6a corresponds to the head of the control lever 6 which is mounted for pivoting in the yoke 3
  • the second portion 6b corresponds to a slender portion to be gripped by the driver whilst he is gripping the corresponding hand grip 8.
  • the slender portion has a curved shape designed to favour ergonomic gripping.
  • the control lever 6 can pivot about its fulcrum A towards the corresponding hand grip 8 as a result of the force exerted by the driver.
  • the pivoting of the control lever 6 defines a plane X of pivoting, a line of which is shown in Figure 1.
  • the cylinder body 2 extends as a unitary element defining the seat 4, which is shaped so as to extend around a portion of the handlebar 7.
  • the walls which delimit the seat 4 are defined by an end of the cylinder body and by a U-shaped element 9. Both the end of the cylinder body and the U- shaped element comprise holes for receiving threaded elements 10 which clamp the structure of the cylinder body 2 to the handlebar.
  • the seat 4 is cylindrical in order to extend around the tubular structure of the handlebar 7 and extends along a longitudinal axis which, in the mounted condition, coincides with the longitudinal axis of the portion of the handlebar on which the cylinder 1 is mounted.
  • the axis of the seat 4 and the axis of the handlebar portion on which the cylinder 1 is mounted are indicated by the same reference numeral 11.
  • the end portion of the handlebar 7, corresponding to the region in which it is gripped by the driver, extends along an axis which preferably lies in the plane X of the pivoting of the control lever 6 about its fulcrum A.
  • the axis of the end portion of the handlebar 7 coincides with the axis 11 of the portion of the handlebar on which the cylinder 1 is mounted and, in the mounted condition, therefore coincides, with the axis 11 of the seat 4 of the cylinder body 2.
  • the plane X of pivoting of the control lever 6 may be inclined downwards at about 15° to the horizontal plane P, in the direction of travel of the vehicle. That is, with reference to the horizontal plane P of Figure 1 in which the axis 11 of the seat 4 lies, the fulcrum of the control lever 6 is disposed in the lower half-space relative to that plane, in accordance with the downward direction indicated by the second vector V ' of the axis V, as defined above.
  • the reservoir 5 contains the working fluid and is closed at the top by a cover 12 with which a flexible membrane is generally associated.
  • the working fluid contained in the reservoir 5 adheres to the membrane and never comes into direct contact with the outside atmosphere when the vehicle is in use.
  • a chamber 13 defined inside the cylinder body 2 is connected to the reservoir by means of a duct 14 through which the working fluid can pass from the reservoir to the chamber. Moreover, the chamber 13 has conventional delivery and bleed openings, not shown.
  • the chamber 13 has a cylindrical shape which extends along an axis 15, generally referred to as the cylinder axis.
  • the axis 15 lies in the plane X of pivoting of the control lever 6 and intersects both the axis 11 of the seat 4 and of the handlebar 7, and the control lever 6. More specifically, the axis 15 defines the theoretical line of demarcation between the two portions ⁇ a and 6b of the control lever 6.
  • the chamber 13 houses a floating piston 16 which can move along the axis 15 forming a seal against the walls of the chamber by means of suitable seals. More particularly, the piston 16 can move between a travel- limit, rest position shown in Figure 2 and an advanced, operative position, not shown. In the travel-limit, rest position, the piston 16 is urged by a return spring 17 to a position corresponding to the maximum distance from the handlebar whereas, to reach the advanced, operative position, the piston 16 overcomes the force of the return spring 17 and the pressure of the fluid contained in the chamber 13 and in the system, and advances towards the handlebar.
  • This movement is brought about by the pivoting of the control lever 6, by means of an operative connection which comprises a rod 18 the longitudinal axis of which may coincide substantially with the axis 15 or in any case may lie in the plane X of pivoting.
  • the rod 18 has a first portion 18a substantially inside the chamber 13 and interacting with the piston 16 and a second portion 18b which extends out of the chamber 13 and, in particular, towards the control lever 6.
  • the two portions are delimited substantially by a dust- protection boot 19 which closes the chamber 13 from the outside atmosphere.
  • the interaction between the first portion 18a and the piston 16 takes place by means of a connection 20 formed by a seat formed at the end of the piston and coupled with a rounded end of the first portion 18a of the rod.
  • the second portion 18b terminates in a cylindrical swivel joint 21 connecting the rod 18 and the control lever 6.
  • the cylindrical swivel joint 21 is formed by one end of the second portion 18b which is coupled with a seat of complementary shape formed in the body of the control lever 6.
  • the cylinder 1 is mounted, for example, on a mass-produced motor cycle, as shown in Figure 2, electrical controls, indicated 22, are fitted on the handlebar 7, between the hand grip 8 and the cylinder 1.
  • electrical controls indicated 22, are fitted on the handlebar 7, between the hand grip 8 and the cylinder 1.
  • the axis 15 of the chamber 13 is advantageously inclined to the axis of the seat 4 and hence to the axis 11 of the handlebar portion 7 on which the cylinder body 2 is clamped.
  • the term "inclined" means that the axis 15 intersects the axis 11 at a point and does not coincide with an axis 23 perpendicular to the axis 11, lying in the plane X of pivoting of the control lever 6 and extending through the point of intersection between the axis 15 and the axis 11.
  • the axis 15 intersects both the axis 11 and the axis 23, naturally with reference to the most widely used arrangement in which the axis 11, the axis 15 and hence the axis 23, all lie in the same plane, that is, in the plane X of pivoting of the control lever 6.
  • the axis 11 and the axis 15 are inclined to one another at an acute angle ⁇ , where ⁇ means the angle shown in Figure 2 which, if the cylinder 1 is viewed from above in the direction of the vector V', is measured anticlockwise, starting from the axis 11, without the axis 11 covering itself during the rotation.
  • the acute angle ⁇ may also be defined as the angle between the axis 11 and the axis 15, corresponding to the sector which faces the second portion 6b of the control lever 6.
  • the operative connection between the control lever and the piston is disposed on the side of this plane facing towards the hand grip.
  • the axis 15 of the chamber 13 is also advantageously inclined to the axis 11 of the seat 4.
  • the term "inclined" means that the axis 15 intersects the axis 11 at a point and does not coincide with an axis 23 perpendicular to the axis
  • the axis 11 and the axis 15 are inclined to one another at an acute angle, meaning, in this case, the angle which, if the cylinder is viewed from above in the direction of the vector V ' , is measured clockwise, from the axis 11, without the axis 11 covering itself during the rotation.
  • this angle may also be defined as the angle between the axis 11 and the axis 15 corresponding to the sector which faces the second portion 6b of the control lever 6.
  • the angle ⁇ in the case of the brake cylinder, or its equivalent in the case of the clutch cylinder, advantageously has a value of between 60° and 80°, preferably between 70° and 75°.
  • the fulcrum A of the control lever 6 is closer to the hand grip 8 than the position the fulcrum
  • A would adopt if the axis 15 were perpendicular to the axis 11.
  • the cylindrical swivel joint 21 and the fulcrum A are appreciably closer to the hand grip 8 both for the brake cylinder and for the clutch cylinder.
  • the cylinder body 2 extends substantially along the axis 15, following the inclined course thereof relative to the axis 11.
  • the fulcrum A of the control lever 6 is substantially aligned with the seat 4 along an axis perpendicular to the axis 11.
  • the driver of the vehicle grips the hand grip 8 and the control lever 6 and pivots the latter about its fulcrum A, moving it towards the hand grip.
  • the control lever 6 pivots in the plane X, interacting with the rod 18 and consequently with the piston 16.
  • control lever 6 acts on the rod 18 in the region of the cylindrical swivel joint 21, causing the rod 18 to slide in the plane X of pivoting of the control lever 6.
  • the movement of the rod 18 urges the piston 16 from the travel-limit, rest position to the advanced, operative position, overcoming the force of the return spring 17 and the pressure of the working fluid.
  • the master cylinder according to the present invention solves the problems described with reference to the prior art and satisfies the above- mentioned requirements, that is, to achieve the best compromise between braking action and sensitivity of operation and to limit dimensions, at the same time preventing the cylinder from interfering with the bodywork and the instruments during steering.
  • the largest dimension in the direction perpendicular to the handlebar is reached at a point which is disposed farther out, relative to the longitudinal axis of the motor vehicle, than with cylinders having axes perpendicular to the handlebar.
  • the cylinder according to the present invention enables substantially the same optimal lever ratio as in racing motor cycles to be maintained in mass-produced motor cycles, even though the cylinder is disposed farther from the hand grip.
  • the fact that the axis 15 of the cylinder is inclined to the axis 11 of the seat 4 in accordance with the conditions and the definitions described above, enables the length of the second portion 6b of the control lever 6 to be limited, whilst maintaining an optimal lever ratio, as already stated above.
  • the parallel advantage of a reduction in the weight of the cylinder is also achieved.
  • the advantageous configuration described above provides a very compact overall structure which does not extend too far from the handlebar and does not therefore affect the external configuration of the motor cycle either from the aesthetic point of view or from the functional point of view.
  • a further advantage of the master cylinder according to the present invention lies in the simplicity of its structure, which enables the problems mentioned with reference to the prior art to be solved without, however, altering the shape and functionality either of the vehicle as a whole or of its braking/clutch systems, in particular.
  • the definition according to which the axis 15 intersects both the axis 11 and the axis 23 perpendicular to the axis 11 relates to the situation in which the three above-mentioned axes lie in the same plane, corresponding to the plane X of pivoting of the control lever 6.
  • a possible variant may provide for the axis 11 to lie in the plane X of pivoting and for the axis 15 of the cylinder to be disposed in a plane parallel to the plane X of pivoting.
  • this expression is intended to define the straight line obtained by the intersection of the plane X of pivoting with a plane including the axis 15 of the cylinder and perpendicular to the plane of pivoting.
  • perpendicular projection of the axis 15 onto the plane X of pivoting is intended to define the straight line obtained by the intersection of the plane X of pivoting with a plane comprising the axis 15 of the cylinder and perpendicular to the plane of pivoting thereof.
  • projection of the axis 15 onto a plane containing the axis 11, for example, the plane X of pivoting is intended to define either a projection, preferably a perpendicular projection, according to the conditions indicated above, or the axis 15 itself, when the axis 15 and the axis 11 lie in the same plane.
  • the handlebar portion on which the cylinder 1 is mounted may relate to the handlebar portion on which the cylinder 1 is mounted.
  • the axis of the handlebar portion on which the seat 4 is mounted coincides with the axis of the end portion of the handlebar corresponding to the hand grip 8. If the two axes do not coincide, for ergonomic reasons the plane X of pivoting of the control lever 6 includes the axis of the end portion of the handlebar corresponding to the hand grip.
  • the axis of the handlebar portion on which the seat 4 is mounted coincides with the axis of the seat.
  • the reservoir 5 may be formed separately from the cylinder body 2, as shown in Figure 1, or may be formed integrally with the cylinder body 2, according to an embodiment not shown.
  • a person skilled in the art may apply to the above-described preferred embodiment of the master cylinder many modifications, adaptations and replacements of elements with other functionally equivalent elements without, however, thereby departing from the scope of the appended claims.

Abstract

La présente invention concerne un maître-cylindre (1) pour véhicules à commande par leviers à main (7) qui peut être exceptionnellement compacte tout en conservant un rapport de levier optimal. Ledit maître-cylindre comprend un corps de cylindre (2) présentant un siège (4), s'étendant le long d'un axe (11), renfermant une partie du levier à main (7). Le corps de cylindre (2) dépasse du siège (4) en s'éloignant du levier à main (7), jusqu'à au moins une connexion fonctionnelle entre un levier de commande (6) et un piston (16) se trouvant à l'intérieur du corps de cylindre. Lorsque le corps de cylindre (2) est monté sur le levier à main, le siège (4) présente une face qui est destinée à faire face à une poignée (8) du levier à main. De plus, par rapport à un plan perpendiculaire à l'axe (11) du siège (4) et s'étendant à travers une partie du siège (4) connecté au corps de cylindre (2), la connexion entre le levier de commande (6) et le piston (16) se trouve du côté de ce plan faisant face à la poignée (8).
PCT/IT2001/000032 2001-01-24 2001-01-24 Maitre-cylindre pour vehicules a commande par leviers a main WO2002058988A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2001/000032 WO2002058988A1 (fr) 2001-01-24 2001-01-24 Maitre-cylindre pour vehicules a commande par leviers a main

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2001/000032 WO2002058988A1 (fr) 2001-01-24 2001-01-24 Maitre-cylindre pour vehicules a commande par leviers a main

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Publication Number Publication Date
WO2002058988A1 true WO2002058988A1 (fr) 2002-08-01

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1346893A1 (fr) * 2002-03-18 2003-09-24 Nissin Kogyo Co., Ltd. Cylindre de frein pour un véhicule muni d'un guidon
WO2008056379A1 (fr) * 2006-11-06 2008-05-15 Freni Brembo S.P.A. Dispositif de levier pour faire fonctionner un actionneur hydraulique, en particulier pour motocyclettes
USD641670S1 (en) 2010-11-24 2011-07-19 Hb Performance Systems, Inc. Brake pad
US8943924B2 (en) 2010-11-24 2015-02-03 Hb Performance Systems, Inc. System and method for an adjustable lever assembly
CN104583032A (zh) * 2012-05-31 2015-04-29 罗伯特·博世有限公司 Abs液压单元
US10189539B2 (en) 2013-01-18 2019-01-29 Gustav Magenwirth Gmbh & Co. Kg Master cylinder device for a hydraulic disk brake
US10676151B2 (en) 2017-08-03 2020-06-09 Shimano Inc. Hydraulic operating device
US20210362802A1 (en) * 2020-05-19 2021-11-25 Shimano Inc. Piston assembly for human-powered vehicle
US11702169B2 (en) * 2019-09-04 2023-07-18 Shimano Inc. Hydraulic operating device for human-powered vehicle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935930A (en) * 1973-05-04 1976-02-03 Shimano Industrial Company, Limited Fluid pressure braking system for a bicycle
US4779482A (en) * 1985-12-06 1988-10-25 Honda Giken Kogyo Kabushiki Kaisha Adjustable manipulating lever for motorcycle
EP0893337A2 (fr) * 1997-07-23 1999-01-27 Cagiva Motor S.p.A. Ensemble de maítre-cylindre, réservoir et levier de commande hydraulique pour motocyclette

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935930A (en) * 1973-05-04 1976-02-03 Shimano Industrial Company, Limited Fluid pressure braking system for a bicycle
US4779482A (en) * 1985-12-06 1988-10-25 Honda Giken Kogyo Kabushiki Kaisha Adjustable manipulating lever for motorcycle
EP0893337A2 (fr) * 1997-07-23 1999-01-27 Cagiva Motor S.p.A. Ensemble de maítre-cylindre, réservoir et levier de commande hydraulique pour motocyclette

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1346893A1 (fr) * 2002-03-18 2003-09-24 Nissin Kogyo Co., Ltd. Cylindre de frein pour un véhicule muni d'un guidon
WO2008056379A1 (fr) * 2006-11-06 2008-05-15 Freni Brembo S.P.A. Dispositif de levier pour faire fonctionner un actionneur hydraulique, en particulier pour motocyclettes
US8336308B2 (en) 2006-11-06 2012-12-25 Freni Brembo S.P.A. Lever device for operating a hydraulic actuator, particularly for motorcycles
USD641670S1 (en) 2010-11-24 2011-07-19 Hb Performance Systems, Inc. Brake pad
US8943924B2 (en) 2010-11-24 2015-02-03 Hb Performance Systems, Inc. System and method for an adjustable lever assembly
EP2857268A4 (fr) * 2012-05-31 2016-01-13 Bosch Gmbh Robert Unité hydraulique de système de freinage antiblocage
CN104583032A (zh) * 2012-05-31 2015-04-29 罗伯特·博世有限公司 Abs液压单元
CN104583032B (zh) * 2012-05-31 2017-10-03 罗伯特·博世有限公司 Abs液压单元
US9827959B2 (en) 2012-05-31 2017-11-28 Robert Bosch Gmbh ABS hydraulic unit
US10189539B2 (en) 2013-01-18 2019-01-29 Gustav Magenwirth Gmbh & Co. Kg Master cylinder device for a hydraulic disk brake
US10676151B2 (en) 2017-08-03 2020-06-09 Shimano Inc. Hydraulic operating device
US10967932B2 (en) 2017-08-03 2021-04-06 Shimano Inc. Hydraulic operating device
US11702169B2 (en) * 2019-09-04 2023-07-18 Shimano Inc. Hydraulic operating device for human-powered vehicle
US20210362802A1 (en) * 2020-05-19 2021-11-25 Shimano Inc. Piston assembly for human-powered vehicle
US11572128B2 (en) * 2020-05-19 2023-02-07 Shimano Inc. Piston assembly for human-powered vehicle

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