Brakes – Operators – Speed-responsive
Patent
1985-03-29
1986-12-02
Reger, Duane A.
Brakes
Operators
Speed-responsive
B60T 8093
Patent
active
046258388
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a device for preventing skidding or spinning of a wheel relative to a wheel contacting surface.
2. Description of the Prior Art
A major problem encountered with road or rail vehicles is that of spinning or skidding, ie slip of tires relative to the road or track surface.
In the case of a road vehicle, this condition most commonly hppens when the road surface is wet or covered by ice. In such a case, either the wheels spin relative to the road when the wheels are being driven, or, alternatively, when a braking force is applied to the wheel, the brake and tire lock up relative to the road and the vehicle skids. Skidding and spinning are both undesirable and dangerous and proposals have been made to alleviate the problems they create.
In particular, a system, to prevent skidding during braking of a motor vehicle, has been proposed which employs an inertia responsive device or flywheel which responds to a declaration in excess of a pre-determined value. Movement of the inertia responsive device or flywheel controls the pressure of braking fluid, in a braking system, thus controlling the degree of braking, and preventing the wheel from locking up relative to the road surface, and skidding.
A disadvantage of the above mentioned system is that an associated fluid control system including a pump is required to restore the braking fluid pressure once the skidding has ceased. This makes the arrangement expensive and complicated.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a vehicle anti-skid/wheelspin device, which comprises
a hub,
a force application means,
an engagement means to engage said hub with said force application means,
an inertia responsive means cooperating with said engagement means to disengage said hub from said force application means at a predetermined rate of change of velocity of said hub relative to said inertia responsive means,
characterised in that said engagement means is a clutch of wrap spring construction.
According to the invention also, a declutching system is provided which is adaptable to be responsive to at least one of acceleration and deceleration, so s to declutch a first member from a second member, when said acceleration or deceleration of said first and second members exceeds a predetermined level.
BRIEF DESCRIPTIONS OF THE DRAWINGS
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings in which:
FIG. 1 is a sectional view of an embodiment of the invention.
FIG. 2 is a part sectional view taken along the line 2.2' of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to FIGS. 1 and 2, a wheel hub and disc brake assembly 1, of generally cylindrical form, is shown. The assembly 1 includes a wheel hub 3 positioned relative to a shaft 5 by means of a nut 7, the hub 3 being freely rotatable on the shaft 5 by means of taper roller bearings 9. The hub 3 includes studs 11 for engagement with, for example, a conventional car wheel and tire (not shown).
A disc brake assembly 13 is mounted relative to the inner cylindrical portion 15 of the hub 3. The disc brake assembly 13 includes a disc 17 which is mounted by means of bearing material 19 relative to the portion 15. A pair of conventional disc brake pads 21 are shown in phantom lines, these being connected to a disc brake caliper (not shown) for applying a brake force to the disc. A wrap spring 23 is coiled around the outer surface 25 of an axially extending portion 27 of the disc 17. The wrap spring 23 is press fitted on to the portion 27.
The spring 23 is formed from high tensile steel, for example EN50, and is of square cross section. The spring is secured at one end 29 thereof in a slot in the hub 3. The end 29 of the spring 23 is slightly enlarged so as to prevent the spring 23 retracting into the hub. A pin 31 is driven into the hub 3, across the end 29, to prevent axial displacement of the spring 23 towards the disc 17.
The end
REFERENCES:
patent: 1636706 (1927-07-01), Reisfeld
patent: 1640919 (1927-08-01), Ballot
Reger Duane A.
The Secretary of State for Transportation in Her Britannic Majes
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