US 5,669,265 AGranted

Arrangement for gear change operation

AssigneeScania CV AB

InventorHorst Adler

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Abstract

An apparatus for operating a device, e.g. through moving a piston rod. An outer cylinder has an inner cylinder movable between the end walls of the outer cylinder, whereby the inner cylinder is a piston movable in the outer cylinder. An inner piston in the inner cylinder is movable between the end walls of the inner cylinder. First and second fluid flow ducts communicate through the ends of the outer cylinder outside the inner cylinder. Third and fourth fluid flow passages communicate between the outer cylinder and the inner cylinder at the opposite respective sides of the inner piston in the inner cylinder, such that application of gas under pressure to one or the other of the first and second ducts causes movement first of the outer piston in the outer cylinder and then of the inner piston in the inner cylinder for moving the piston rod connected with the inner piston. Details of an embodiment of this staged movement cylinder piston arrangement are disclosed. The third and fourth passages are shaped for slower flow than the first and second ducts, so that movement of the inner piston and its rod can be in stages, the first stage rapid and the second stage slow and more controlled. The apparatus is particularly useful for shifting an operating device such as a gear change shaft to a gear box.

Claims19

Dependent claims

Apparatus for causing staged movement of a gear change shaft in a synchronized vehicle gearbox, the apparatus comprising:

an outer cylinder having opposite spaced apart first and second end walls and the cylinder extending between the first and second end walls and defining a space in the outer cylinder;
a piston-and-cylinder package in the outer cylinder and shaped for moving through the space in the outer cylinder selectively toward the first or the second end walls;
the piston-and-cylinder package comprising:
an outer, first piston in the space in the outer cylinder and movable through the outer cylinder selectively toward one of the first and the second end walls, the first piston defining a space within the first piston which defines a second, inner cylinder having respective opposite spaced apart third and fourth end walls and the inner cylinder defining the space therein extending between the third and fourth end walls;
the third end wall of the first piston opposing the first end wall of the outer cylinder and the fourth end wall of the first piston opposing the second end wall of the outer cylinder;
an inner, second piston disposed in and movable through the inner cylinder selectively toward one of the third and fourth end walls;
the gear change shaft being connected with the second inner piston to be moved by movement of the second piston;
a first fluid duct communicating into the outer cylinder between the first and third end walls;
a second fluid duct communicating into the outer cylinder between the second and fourth end walls;
the first and second fluid ducts being connected for selectively supplying fluid to or removing fluid from the cylinder space inside the outer cylinder;
a third fluid flow passage between the outer and the inner cylinders past the third end wall of the inner cylinder;
and a fourth fluid flow passage between the outer and the inner cylinders past the fourth end wall of the inner cylinder.

9 more elements

Apparatus for causing staged movement in changing of gears in a vehicle gear box, the apparatus comprising:

a vehicle gear box including two gears, each gear being selectively engageable;
a gear change shaft movable for causing engagement of a selected of the gears;
apparatus for moving the gear change shaft comprising;
an outer cylinder having opposite spaced apart first and second end walls and the cylinder extending between the first and second end walls and defining a space in the outer cylinder;
a piston-and-cylinder package in the outer cylinder and shaped for moving through the space in the outer cylinder selectively toward the first or the second end walls;
the piston-and-cylinder package comprising:
an outer, first piston in the space in the outer cylinder and movable through the outer cylinder selectively toward one of the first and the second end walls, the first piston defining a space within the first piston which defines a second, inner cylinder having respective opposite spaced apart third and fourth end walls and the inner cylinder defining the space therein extending between the third and fourth end walls;
the third end wall of the first piston opposing the first end wall of the outer cylinder and the fourth end wall of the first piston opposing the second end wall of the outer cylinder;
an inner, second piston disposed in and movable through the inner cylinder selectively toward one of the third and fourth end walls;
the gear change shaft being connected with the second inner piston to be moved by movement of the second piston;
a first fluid duct communicating into the outer cylinder between the first and third end walls;
a second fluid duct communicating into the outer cylinder between the second and fourth end walls;
the first and second fluid ducts being connected for selectively supplying fluid to or removing fluid from the cylinder space inside the outer cylinder;
a third fluid flow passage between the outer and the inner cylinders past the third end wall of the inner cylinder;
and a fourth fluid flow passage between the outer and the inner cylinders past the fourth end wall of the inner cylinder.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/636,922Filed 24 Apr 1996
Priority: SE 950153626 Apr 1995
Granted: 23 Sep 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16H 61/30
With at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted: hydraulic or pneumatic…
F16H 63/3023
Constructional features of the final output mechanisms: the final output mechanisms comprising elements moved by fluid pressure
F16H 61/04
Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid…
F16H 2061/2823
With at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted: controlling actuator…