Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Control of differential planetary gearing
Patent
1989-12-06
1992-02-11
Braun, Leslie A.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Control of differential planetary gearing
475234, 475241, 192 59, F16H 144
Patent
active
050872281
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device to oppose relative rotational movement between two rotatable shafts, comprising at least one first braking means rotating together with one of the mentioned shafts, and at least one second braking means rotating together with a rotatable housing designed to cooperate so as to bring along the other of the shafts, the two braking means being designed to be adjusted between a releasing position and a contact position so that upon relative rotational movement between the two shafts the two braking means can be brought into braking contact with one another in order to oppose said relative rotational movement.
BACKGROUND OF THE INVENTION
It is well known to use limited slip differentials to detect differences in rotational speed between two shafts containing braking discs arranged to rotate with each of the two shafts, and to be engaged when a certain difference in rotational speed is reached. In order to activate the engagement of the braking discs, a detection device is required to detect the difference in rotational speed, and to mechanically engage the braking discs. In previous arrangements, the detection device has been complicated and has exhibited functional problems.
SUMMARY OF THE INVENTION
An object of the present invention is to present a simple, but at the same time effective arrangement to oppose differences in speed between two rotating shafts and thereby offer a solution to the driving and traction problems experienced in modern vehicles.
In accordance with the present invention, this objective has been reached by means of a device which is characterized in that one of the shafts has an element which is rotatable together with the shaft and which contains an inclined surface slightly deviating from a perpendicular position relative to the longitudinal axis of the shaft, the element being connected with a braking means associated with the mentioned shaft, which braking means follows the motions of the rotating element, the element being slightly moveable in an axial direction relative to a braking means associated with the other shaft, that connected to and rotating with at least one of the shafts there is a device comprising pistons which may be displaced relative to the aforementioned inclined surface, each piston being situated in a chamber with pressure fluid, and that the pistons are able to cooperate with the inclined surface in such a way that, upon a torsional movement of the inclined surface relative to the pistons, the inclined surface forces at least one of the pistons into its pressure chamber against the resistance of the pressurized fluid. Thus, the slightest difference in relative rotational speed between the two shafts will cause an axial movement of the rotatable element and thereby a braking engagement between the braking means.
BRIEF DESCRIPTION OF THE DRAWINGS
The embodiments of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:
FIG. 1 is a partly broken sectional view of a differential arrangement incorporating the device of the present invention;
FIG. 2 is a sectional view through line II--II of FIG. 1;
FIG. 3 is a sectional view through a second embodiment of the device in accordance with the present invention; and
FIG. 4 is a sectional view through a third embodiment of the device in accordance with the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 1, a conventional differential is shown incorporating the device of the present invention, a so-called limited slip differential. The differential includes drive shafts 1, 2 which are disposed for rotation in differential casing 4. Enclosed within differential casing 4 are differential crown wheels 9, 10, fixedly attached for rotation with drive shafts 1, 2, respectively, and differential pinion wheels 6, 7 rotatably fitted to pinion shaft 5 in right angle engagement with crown wheels 9, 10. This arrangement is typical in a motor driven vehicle
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patent: 4445400 (1984-05-01), Sullivan et al.
patent: 4456110 (1984-06-01), Hanks et al.
patent: 4535651 (1985-08-01), Chambers
patent: 4732052 (1988-03-01), Dewald
patent: 4811628 (1989-03-01), Winkem et al.
Braun Leslie A.
Levi Benjamin
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