Power plants – Pressure fluid source and motor – Pulsator
Patent
1994-11-17
1997-06-10
Nguyen, Hoang
Power plants
Pressure fluid source and motor
Pulsator
B60T 702
Patent
active
056365187
DESCRIPTION:
BRIEF SUMMARY
This invention relates to operating mechanisms for master cylinders and particularly to mechanisms fitted to handlebars of motorcycles for operation of a hydraulic mastercylinder through a hand operated lever.
The load required to operate a hydraulic system is proportional to the load applied to the operating lever to build up the hydraulic pressure. The input load acting on the operating lever is multiplied by the ratio of the distance from the lever pivot to the point of application of the input load, to the distance from the lever pivot to the point of application of the output load. This output load may constitute the direct input to the master cylinder or may be fed into other levers before being fed into the master cylinder.
In some applications it is known to vary the effort required at the operating lever by varying the lever position so that the operating feel is adjustable as is desired by the operator. Such lever arrangements are shown in GB2226 112-A and in U.S. Pat. No. 5,050,381.
The present application provides a means of altering the effective lever ratio of the operating lever which is simple and effective.
Accordingly there is provided an operating lever mechanism for a master cylinder and which comprises a mounting bracket, a lever mounted on the bracket through a pivot pin and which is connectable to a master cylinder actuating rod, the mechanism being characterised in that the pivot pin is adjustably mounted on the bracket so that the operating lever ratio can be adjusted as desired.
Conveniently the bracket is for mounting on a handlebar and the lever is a hand operable lever.
Preferably, the lever is connectable to the actuating rod at one end of the lever, and the pivot pin is located adjacent said one end such that when the operating load is applied at the other end of the lever, said one end moves to apply a pull load to the actuating rod.
Conveniently the assembly includes a master cylinder body which is formed integrally with the mounting bracket, and the actuating rod is coaxial of the master cylinder bore and is connected to lever through a screw-threaded adjustable connection which allows the lever to be set in a desired orientation relative to the bracket.
The present invention will be described, by way of example only, and with reference to the accompanying drawings in which:
FIG. 1 is a sectional view of a master cylinder assembly having an operating lever according to one aspect of the present invention;
FIG. 2 is an end view of a mounting bracket and integral master cylinder as used in the assembly in FIG. 1;
FIG. 3 is an enlarged view of the bracket taken in the direction of arrow A as FIG. 1 showing the lever in cross section;
FIG. 4 is an enlarged view of the connection between the lever and the master cylinder actuating rod;
FIG. 5 is an end view of the lever and the connection shown in FIG. 4;
FIG. 6 is a view of the top side of the lever end of FIG. 4;
FIG. 7 is a sectional view on line VII--VII of FIG. 8 through a second operating lever also according to the invention, and
FIG. 8 is a sectional view on the line VIII--VIII of FIG. 7.
With reference to FIGS. 1 to 3, there is illustrated a hydraulic master cylinder assembly 11 for mounting on the handlebars 15 of the motorcycle. The master cylinder assembly 11 could be utilised to operate hydraulic brakes or a hydraulically operated clutch.
The master cylinder assembly 11 comprises a mounting bracket 12 having a flange 13 with a concave cylindrical mounting surface 14 for attachment to a pair of handlebars 15 (shown in dotted outline only). The bracket includes a master cylinder body 16 formed integrally therewith having a master cylinder bore 17 with its blind end adjacent the concave mounting surface 14 and an open end 18 away from said concave surface such that the axis of the bore 17 is substantially normal to the longitudinal axis X--X (see FIG. 2) of the mounting surface.
The mounting bracket 12 has a pair of spaced lugs 21 that project therefrom and which support a pivot pin 22 with a pivot axis 22a for an ope
REFERENCES:
patent: 2199863 (1940-05-01), Wehr
patent: 2766585 (1956-10-01), Wittren
patent: 3048980 (1962-08-01), Cousino et al.
patent: 3146597 (1964-09-01), Knauss
patent: 4560049 (1985-12-01), Uchibaba
patent: 5050381 (1991-09-01), Matsuno et al.
Bass Richard A.
Burgoyne Kevin
Automotive Products plc
Germain Lee A.
Milliken Paul E.
Nguyen Hoang
LandOfFree
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