WO2002026556A1 - A master cylinder body for an hydraulic master cylinder for vehicles controllable by handlebars - Google Patents
A master cylinder body for an hydraulic master cylinder for vehicles controllable by handlebars Download PDFInfo
- Publication number
- WO2002026556A1 WO2002026556A1 PCT/IT2000/000388 IT0000388W WO0226556A1 WO 2002026556 A1 WO2002026556 A1 WO 2002026556A1 IT 0000388 W IT0000388 W IT 0000388W WO 0226556 A1 WO0226556 A1 WO 0226556A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- master cylinder
- cylinder body
- handlebars
- axis
- plane
- Prior art date
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
-
- 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 present invention relates to a master cylinder body for an hydraulic master cylinder, and to an hydraulic master cylinder, for brakes and/or clutches of vehicles controllable by handlebars, such as motorcycles, motorcycle combinations, tricars and the like. More particularly, the invention relates to a master cylinder body for hydraulic master cylinders of the type in which a working-fluid reservoir separate from the master cylinder body is provided.
- vehicles controllable by handlebars are normally provided with an hydraulic master cylinder for controlling the brake associated with the front wheel of the vehicle; that master cylinder is mounted on the handlebars on one side thereof, typically on the right-hand side relative to the direction of travel of the vehicle.
- a further hydraulic master cylinder may be provided in order to control the clutch and is mounted on the handlebars on the opposite side to the master cylinder for controlling the brake, typically on the left-hand side relative to the direction of travel .
- Known hydraulic master cylinders particularly those of the type having a separate reservoir for working fluid, comprise a master cylinder body produced integrally by casting and comprising a first portion in which a chamber for accommodating a piston acting on a working fluid is formed, a second portion at the location of which a fork for hinging a piston-control lever is formed, and a third portion for securing the master cylinder body to the handlebars; the last-mentioned portion has a semicylindrical seat for accommodating the handlebars, which seat is to cooperate with a U-bolt having a complementary semicylindrical seat; by tightening the U-bolt on the master cylinder body by conventional means, such as screws, the handlebars are clamped firmly between the U-bolt and the master cylinder body.
- the master cylinder body also comprises a connector for the entry of the working fluid coming from the reservoir, which connector is formed by a flange which extends transversely to an axis of the chamber for accommodating the piston (for the sake of brevity referred to hereinafter as the axis of the master cylinder body) .
- the axis of the master cylinder body is substantially parallel with the axis of the handlebars.
- the piston-control lever hinged to the fork of the master cylinder body lies in a plane defined by the axis of the handlebars and by the axis of the master cylinder body; that plane constitutes the plane of symmetry and pivoting of the control lever.
- the master cylinder body is mounted on the handlebars in such a manner that the above-mentioned plane of symmetry and pivoting of the control lever is not horizontal but inclined downwards in the direction of travel of the vehicle, by an angle of, typically, approximately 15°.
- the master cylinder body is mounted on the handlebars in such a manner that the flange of the connector for the entry of fluid, which, as stated, lies transversely relative to the axis of the master cylinder body, extends upwards perpendicularly to a horizontal plane and therefore the master cylinder body is formed in such a manner that the flange of the connector for the entry of fluid is inclined by the complement of that angle relative to the plane in which the control lever lies and pivots.
- the portion for securing the master cylinder body to the handlebars also has a plane of connection to the associated horizontal U-bolt, which plane passes through the axis of the handlebars and is thus inclined by the above-mentioned angle relative to the plane in which the control lever lies and pivots.
- a master cylinder body produced for coupling to the right-hand portion of the handlebars thus typically for a brake master cylinder, cannot be used on the left-hand portion of the handlebars, that is to say, for a clutch master cylinder, without giving rise to an extremely obvious and unacceptable dissymmetry between the right-hand portion and the left-hand portion of the handlebars.
- a master cylinder body produced for the right-hand portion the master cylinder body would have to be turned over, with the result that the flange of the connector for the entry of fluid would extend downwards instead of ⁇ upwards. That, in addition to giving rise itself to a visible dissymmetry, would involve a modification to the hydraulic circuit for supplying fluid from the reservoir to the master cylinder body, relative to the analogous circuit provided on the right-hand portion of the handlebars .
- the prior art provides for the manufacture of master cylinder bodies having a different spatial form depending on the application for which they are intended, for right-hand or left-hand hydraulic master cylinders .
- an object of the present invention is to provide a master cylinder body which does not have the disadvantages associated with the known solutions .
- Figure 1 is an axonometric view of a master cylinder body according to a first possible practical embodiment of the present invention
- Figure 2 is a top plan view of the master cylinder body of Figure 1, that is to say, from a delivery side;
- Figure 3 is a front view of the master cylinder body, in the direction of arrow III in Figure 2;
- Figure 4 is a sectional view of the master cylinder body taken on the plane IV-IV in Figure 2 ;
- Figure 5 is an axonometric view of a master cylinder body according to a second possible practical embodiment of the present invention.
- Figure 6 is an axonometric view of a master cylinder body according to a third possible practical embodiment of the present invention.
- Figure 7 is an axonometric view of a master cylinder body according to a fourth possible practical embodiment of the present invention
- Figure 8 is an axonometric view of a master cylinder body according to a fifth possible practical embodiment of the present invention
- Figure 9 is a front view of the master cylinder body in the direction of arrow IX in Figure 8, that is to say, from the delivery side;
- Figure 10 is a side view of the master cylinder body in the direction of arrow X in Figure 8, that is to say, from the side where the flange of the connector for the entry of fluid is arranged;
- Figure 11 is a sectional view of the master cylinder body of Figure 8 taken on the plane XI-XI of Figure 10.
- FIGS. 1 to 4 show a master cylinder body 1 according to a first possible practical embodiment of the present invention.
- the master cylinder body 1 comprises a generally cylindrical portion 2 which is internally hollow to form a chamber 3 for the accommodation and sliding of a piston 4 (shown with a dot-dash line in Figure 4) acting on a working fluid.
- a working fluid is to be understood as meaning any type of fluid suitable for use in braking systems or in clutch systems, for example for applications in vehicles controllable by handlebars .
- the portion 2 of the master cylinder body 1 has, at its first end, a connector 90 in which an opening 4 for the delivery of fluid and an opening 5 for carrying out bleeding operations on the hydraulic system are provided.
- the delivery opening 4 can be connected by conventional hydraulic connecting means to a brake or to a clutch.
- An axis 40 of the delivery opening 4 and an axis 50 of the bleeding opening 5 lie on a plane P passing through an axis 20 of the chamber 3 which also constitutes the axis of the portion 2.
- the master cylinder body 1 comprises a portion 6 for securing to handlebars, which are shown with a dot-dash line in Figures 2, 3 and 4 in which they are identified by the reference 7, and a fork 8 for hinging a master cylinder- control lever, shown with a dot-dash line in Figure 2 and identified by the reference 9.
- the control lever is suitable for acting on a rod 100 integral with the piston which is to be accommodated in the chamber 3, so that, by pivoting the lever 9, it is possible to cause the piston to slide inside the chamber 3 so as to compress the fluid' in the hydraulic circuit downstream of the delivery opening 4.
- the portion 6 for securing to the handlebars 7 and the fork 8 for hinging the lever 9 both extend from the generally cylindrical portion 2 substantially transversely to the axis 20 thereof, although from substantially opposite sides.
- the portion 6 for securing the master cylinder body 1 to the handlebars 7 has a seat 11 for the handlebars 7.
- the seat 11 for the handlebars 7 is substantially semicylindrical, and a first pair of shoulders 12, the free surface of which lies in a plane indicated X in Figure 1, is formed on the two sides thereof.
- the two shoulders 12, each of which has a respective threaded hole 13 , are to cooperate with respective shoulders of a second pair of shoulders provided in a U- bolt which is to cooperate with the securing portion 6 of the master cylinder body 1 in order to secure the master cylinder body to the handlebars 7.
- FIGS 3 and 4 show diagrammatically with a dot- dash line such a U-bolt 14 provided with a seat 16 for the handlebars, which seat 16 matches the seat 11 formed in the securing portion 6 and is therefore substantially semicylindrical.
- a pair of shoulders 15 suitable for cooperating with the shoulders 12 of the portion 6 for securing the master cylinder body 1 to the handlebars is provided on the sides of the seat 16.
- the U-bolt 14 is tightened by conventional means, such as screws 17, on the portion 6 in such a manner that the handlebars 7 are clamped firmly between the U-bolt 14 and the portion 6 of the master cylinder body 1.
- a pair of superposed and aligned holes 18 which define a pivoting axis 80 for the lever 9.
- the pivoting axis 80 of the lever 9 is perpendicular to a plane Y passing through the axis 20 of the chamber 3 and through an axis 70 which represents the axis of the handlebars 7 when the master cylinder body 1 is mounted on the handlebars, that is to say, when the handlebars 7 are accommodated in the seat 11.
- the plane Y thus constitutes the plane of symmetry and pivoting of the control lever 9 .
- the master cylinder body 1 is formed in such a manner that the plane Y is inclined by an angle ⁇ , typically 15°, relative to a plane X in which lies the free surface of the pair of shoulders 12 provided in the portion 6 for securing to the handlebars 7.
- a connecting flange 10 for the entry of working fluid extends from an intermediate position between the two ends of the generally cylindrical portion 2, transversely to the axis 20 thereof, and is connectable to a reservoir, separate from the- master cylinder body and not shown in the drawings, for supplying the working fluid to the chamber 3 of the master cylinder body 1 through an orifice 110 which opens into the chamber 3.
- An axis Z of the connector 10 is at right-angles to the axis 20 of the chamber 3 and lies in the plane Y defined above; therefore, the axis Z is inclined relative to the plane X by the angle ⁇ .
- the plane P in which lie the axes 40 and 50 of the openings for delivery 4 and bleeding 5, respectively, passes through the axis 20 of the chamber 3 and forms with the plane Y an angle other than a right-angle.
- the plane P is at right-angles to the plane X.
- the master cylinder body 1 can be used equally well for brake master cylinders, therefore being mounted on the right-hand portion of the handlebars, or for clutch master cylinders, being mounted on the left-hand portion of the handlebars.
- the master cylinder body 1 is mounted on the right-hand portion of the handlebars in, such a manner that the handlebar seat 11 of the portion 6 for securing to the handlebars has its concavity facing upwards, with the plane X, in which the axis of the handlebars lies, arranged horizontally.
- the plane Y in which the control lever 9 lies and pivots is therefore inclined by the desired angle ⁇ relative to the horizontal plane, so that the control lever is directed slightly downwards in the direction of travel of the vehicle (direction of arrow M in Figure 3) .
- the master cylinder body 1 is mounted on the left-hand portion of the handlebars, turned upside down and rotated downwards still in the direction of travel of the vehicle, that is to say, with the concavity of the seat 11 for the handlebars facing downwards, with the plane X no longer arranged horizontally but rotated in such a manner that the plane Y in which the control lever 9 lies and pivots is again rotated downwards by the desired angle relative to the horizontal plane.
- the master cylinder body 1 is suitable for being mounted on the handlebars either on the right or on the left without giving rise to undesired dissymmetry, above all in the two hydraulic circuits.
- FIG. 5 is an axonometric view of a master cylinder body 1' in accordance with a second possible practical embodiment of the present invention.
- the master cylinder body 1' has a portion 60 for securing to the handlebars of the vehicle which has been modified in such a manner that it has a substantially semicylindrical seat 11' for the handlebars, with the convexity facing the axis 20 of the chamber 3 for the piston, which chamber 3 is formed inside the generally cylindrical portion 2 of the master cylinder body.
- the portion 60 for securing to the handlebars has, on the sides of the seat 11' for the handlebars, a pair of shoulders 12', each having a respective threaded hole 13 and being suitable for cooperating with a U-bolt which is in itself identical to the U-bolt 14 of Figures 3 and 4.
- the free surface of the shoulders 12' lies in a plane X' at right-angles to the plane Y passing through the axis 20, through the axis Z of the connector 10 and constituting the plane of symmetry and pivoting of the control lever.
- the portion 60 for securing to the handlebars is also symmetrical relative to the plane Y.
- a further difference from the previous embodiment is that a connector 90', in which the delivery opening 4 and the bleeding opening 5 are formed, is rotated in such a manner that a plane P' passing through axes 40' and 50' of the delivery opening 4 and the bleeding opening 5, respectively, is at right-angles to the plane Y, that is to say, parallel with the plane X' .
- the master cylinder body 1' is completely symmetrical relative to the plane Y.
- the master cylinder body 1' is brought up to the handlebars from the front relative to the direction of travel of the vehicle, taking care to orient the master cylinder body in such a manner that the plane Y is inclined by the desired angle ⁇ relative to a horizontal plane.
- Figure 5 shows the master cylinder body in the position suitable for being mounted on the right-hand portion of the handlebars; in order to mount it on the left-hand portion, it is necessary only to rotate the master cylinder body through 180° about the axis Z .
- the master cylinder body 1' according to this second possible practical embodiment has a further advantage over the previous embodiment: owing to the different form of the portion 60 for securing to the handlebars, the master cylinder body 1' can be mounted equally well on the right-hand side or on the left-hand side of the handlebars without any visible dissymmetry: the U-bolt for tightening the master cylinder body 1' on the handlebars is in both cases positioned on the inner side of the handlebars, in the direction of travel of the vehicle .
- the master cylinder body is easier to manufacture because the mould for producing the rough casting can advantageously be formed from only two portions .
- Figure 6 is an axonometric view of a master cylinder body 1" according to a third possible embodiment of the present invention.
- the master cylinder body 1" is completely symmetrical relative to the plane Y in which lie the axis 20 of the chamber 3 for the piston and the axis Z of the connector 10 for the entry of fluid.
- a connector 90 which is arranged at the end of the portion 2 and in which the fluid-delivery opening 4 and the bleeding opening 5 are formed, is rotated in such a manner that the two axes 40" and 50" of the openings 4 and 5, respectively, lie in the plane of symmetry Y of the master cylinder body 1" .
- the master cylinder body 1" Owing to the fact that it is again completely symmetrical relative to a plane, the plane Y, the master cylinder body 1" has substantially the same advantages as the master cylinder body 1' in the previous embodiment.
- the mounting of the master cylinder body 1" on the right-hand portion or left-hand portion of the handlebars is carried out in a manner entirely analogous to that described in relation to the master cylinder body 1' of Figure 5.
- FIG. 7 is an axonometric view of a master cylinder body 1'" according to a fourth possible practical embodiment of the present invention.
- the master cylinder body 1'" is provided with a connector 10'" for the entry of fluid into the chamber 3 for the piston, which connector 10'" again extends along the axis Z lying in the plane Y, but in the opposite direction to that of the connector 10 of the master cylinder body 1' ; in other words, the connector 10'" extends at right- ' angles to the axis 20 of the chamber 3 for the piston from the same side as the portion 6 for securing to the handlebars, instead of from the side where the fork 8 for hinging the control lever is arranged.
- the master cylinder body 1'" is again completely symmetrical relative to a plane, represented by the plane Y in which lie the axis 20 of the chamber 3 for the piston and the axis Z of the connector 10'" and which constitutes the plane of symmetry and pivoting of the control lever.
- the master cylinder body 1'" has substantially the same advantages as the master cylinder bodies 1' and 1" of Figures 5 and 6.
- Figures 8 to 11 show a master cylinder body 1"" according to a fifth possible embodiment of the present invention.
- the master cylinder body 1"" is substantially analogous to the master cylinder body 1' of Figure 5 and to the master cylinder body 1" of Figure 6, except that one end of the generally cylindrical portion 2 is provided with a connector 90"" which has only one opening 4"", or delivery opening, to which a fluid- delivery pipe is connectable.
- the delivery opening 4"" has an axis coinciding with the axis 20 of the chamber 3 for the piston.
- the master cylinder body 1"" is also completely symmetrical relative to a plane represented by the plane Y in which the axis 20 and the axis Z lie and in which the control lever hinged to the fork 8 lies and pivots.
- the bleeding opening could be provided in a connector, distinct from the connector in which the delivery opening is provided, extending from the portion 2 of the master cylinder body transversely to the axis 20 of the chamber 3 for the piston.
- an axis of the connector in which the bleeding opening is provided will likewise have to lie in the plane Y in which the axis of the connector for the entry of working fluid lies.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2000279453A AU2000279453A1 (en) | 2000-09-29 | 2000-09-29 | A master cylinder body for an hydraulic master cylinder for vehicles controllable by handlebars |
JP2002530357A JP2004509806A (en) | 2000-09-29 | 2000-09-29 | Master cylinder body of a hydraulic hydraulic master cylinder that can be controlled by the handlebar |
EP00969808A EP1320485A1 (en) | 2000-09-29 | 2000-09-29 | A master cylinder body for an hydraulic master cylinder for vehicles controllable by handlebars |
PCT/IT2000/000388 WO2002026556A1 (en) | 2000-09-29 | 2000-09-29 | A master cylinder body for an hydraulic master cylinder for vehicles controllable by handlebars |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT2000/000388 WO2002026556A1 (en) | 2000-09-29 | 2000-09-29 | A master cylinder body for an hydraulic master cylinder for vehicles controllable by handlebars |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002026556A1 true WO2002026556A1 (en) | 2002-04-04 |
Family
ID=11133559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT2000/000388 WO2002026556A1 (en) | 2000-09-29 | 2000-09-29 | A master cylinder body for an hydraulic master cylinder for vehicles controllable by handlebars |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1320485A1 (en) |
JP (1) | JP2004509806A (en) |
AU (1) | AU2000279453A1 (en) |
WO (1) | WO2002026556A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE857901C (en) * | 1951-04-08 | 1952-12-04 | Teves Kg Alfred | Hydraulic transmitter for motor vehicle brakes, in particular for motorcycles, scooters or the like. |
FR2024653A5 (en) * | 1969-03-07 | 1970-08-28 | Shimano Industrial Co | |
US3554334A (en) * | 1968-06-17 | 1971-01-12 | Keizo Shimano | Hydraulic bicycle brake system |
US3802200A (en) * | 1972-03-27 | 1974-04-09 | Kelsey Hayes Co | Plastic master cylinder |
-
2000
- 2000-09-29 AU AU2000279453A patent/AU2000279453A1/en not_active Abandoned
- 2000-09-29 JP JP2002530357A patent/JP2004509806A/en active Pending
- 2000-09-29 WO PCT/IT2000/000388 patent/WO2002026556A1/en not_active Application Discontinuation
- 2000-09-29 EP EP00969808A patent/EP1320485A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE857901C (en) * | 1951-04-08 | 1952-12-04 | Teves Kg Alfred | Hydraulic transmitter for motor vehicle brakes, in particular for motorcycles, scooters or the like. |
US3554334A (en) * | 1968-06-17 | 1971-01-12 | Keizo Shimano | Hydraulic bicycle brake system |
FR2024653A5 (en) * | 1969-03-07 | 1970-08-28 | Shimano Industrial Co | |
US3802200A (en) * | 1972-03-27 | 1974-04-09 | Kelsey Hayes Co | Plastic master cylinder |
Also Published As
Publication number | Publication date |
---|---|
JP2004509806A (en) | 2004-04-02 |
AU2000279453A1 (en) | 2002-04-08 |
EP1320485A1 (en) | 2003-06-25 |
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