Metal working – Method of mechanical manufacture – Providing transitory integral holding or handling portion
Patent
1994-12-29
1997-02-25
Bryant, David P.
Metal working
Method of mechanical manufacture
Providing transitory integral holding or handling portion
295276, 29558, 428582, B23P 1700
Patent
active
056049692
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of manufacturing hydraulic actuators such as brake and clutch master and slave cylinders.
Internal shoe drum brakes of motor vehicles are typically operated by hydraulic wheel cylinders which are mounted on a backplate. Even though a particular size wheel cylinder may be fitted to a number of different vehicles, it is not unknown for different vehicle manufacturers to require different mounting flanges on their wheel cylinders and even for single vehicle manufacturers to have differing mounting flange requirements from vehicle to vehicle.
Wheel cylinder bodies are generally produced as basic castings which are then machined to provide the final wheel cylinder body shape. Because of the differing requirements, particularly with reference to the mounting flange, the basic castings have different shapes and therefore require different jigs for holding the castings during the machining processes Also different jigs may be required for different machining processes. Thus the manufacture of a range of wheel cylinders for a large number off different vehicles will require the use off a large number of different jigs.
This is both expensive and complicated to administer since each jig and casting must arrive at the particular machining process station as matched pairs.
The same production problems also apply to other hydraulic actuators such as clutch and brake master cylinder.
It is an object of the present invention to provide a method of manufacturing an hydraulic actuator body which mitigates the above described production problems.
Thus according to the present invention there is provided a method of manufacturing an hydraulic actuator body characterised by comprising the steps of forming a basic actuator body having a spigot projecting externally therefrom, holding the body by said spigot, and machining the body whilst it is held by the spigot.
The invention also provides a method of manufacturing a wheel cylinder for a drum brake characterised by comprising the steps of forming a basic wheel cylinder body having a flange formed integrally therewith for attachment to a support and a spigot projecting externally away from the body on a side remote from said flange, holding the wheel cylinder body by said spigot, machining the body, and thereafter removing said spigot from the body.
The invention also provides a method of manufacturing a master cylinder body characterised by comprising the steps of forming a basic master cylinder body having a flange formed integrally therewith for attachment to a support and a pair of axially spaced spigots projecting from said basic body, holding the body by said spigots and machining the body whilst it is held by the spigots.
The invention further provides a basic actuator body for use in any of the above described methods, said body being characterised by the provision of one or more holding spigots projecting therefrom.
There is also provided an hydraulic actuator body manufactured by any one of the above described methods.
The invention will now be described, by way of example only, with reference to the accompanying drawings in which:
FIG. 1 is a side elevation of a basic casting for the manufacture of a drum brake slave cylinder body using the method of the present invention;
FIG. 2 is an end view of the casting in FIG. 1;
FIG. 3 is a section on the line III--III of FIG. 1;
FIG. 4 is a schematic drawing showing a spigot of the casting of FIG. 1 gripped between two opposed jaws;
FIGS. 5 and 6 show a machined wheel cylinder body in a finished condition;
FIG. 7 is an under plan view of a basic master cylinder casting prior to machining by the method of the present invention;
FIGS. 8 and 9 are side and end views respectively of the casting of FIG. 7;
FIG. 10 is a transverse section on line X--X of FIG. 8, and
FIG. 11 is a schematic drawing showing a spigot of the casting of FIG. 7 gripped between two opposed jaws.
With reference to FIGS. 1 to 3, there is illustrated a basic casting 10 from which a double-ended wheel cylinder for a motor v
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Automotive Products plc
Bryant David P.
Germain Lee A.
Milliken Paul E.
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