192 clutches and power-stop control – Clutches – Automatic
Patent
1996-05-20
1998-01-06
Lorence, Richard M.
192 clutches and power-stop control
Clutches
Automatic
192 41R, F16D 41067
Patent
active
057044589
DESCRIPTION:
BRIEF SUMMARY
THE INVENTION
The present invention concerns a freewheel cage of an injectable or castable polymeric material arranged between two concentric metal machine components and comprising pockets for locking elements defined between axial crossbars and at least one end section connected integrally thereto, the locking elements being spring-mounted between facing locking surfaces of the machine components while the end section is positively engaged with at least one metal reinforcing ring arranged concentric to the machine components, the coefficient of thermal expansion of the reinforcing ring being substantially equal to that of the machine components, and at least one sliding surface associated to the freewheel cage being arranged on a periphery thereof for sliding contact with a cylindrical surface of one of the machine components.
STATE OF THE ART
Such a freewheel cage is known, for example, from EP-B-0 249 712. The reinforcing ring of this prior art cage is intended to prevent an excessive radial play of the freewheel and undesired friction thereof with one of the machine components due to different thermal expansions of the freewheel and the machine components. The thermal expansion of this known cage is restricted both in the peripheral and in the radial directions.
OBJECT OF THE INVENTION
It is an object of the invention to provide an improved freewheel cage of the aforesaid type in which a restriction of expansion of the freewheel in the peripheral directions is largely possible while, in the radial directions, expansion is prevented to the largest possible extent by the reinforcing ring.
BRIEF DESCRIPTION OF THE INVENTION
The invention achieves this object by the fact that the end section is divided in peripheral direction into a number of segments, and expansion gaps are formed between consecutive segments.
This measure assures the possibility of an unobstructed thermal expansion of the segments in the peripheral directions while restricting expansion in the radial directions. The number of segments and the width of the expansion gaps can be varied according to the conditions of operation and the given structural features. The positive engagement between the reinforcing ring and the segments assures that the segments cannot be displaced along the reinforcing ring.
In an advantageous embodiment of the invention, the reinforcing ring is inserted into grooves of the segments, and the segments and the reinforcing ring comprise recesses and projections which engage positively with one another. It is obvious that the recesses can be made by placing the reinforcing ring as well in the casting mold and spraying it with the polymeric material. The projections serve to fix the segments in the peripheral direction on the reinforcing ring.
In a freewheel cage having locking elements in the form of locking rollers and a locking ramp for each locking roller on one of the locking surfaces, it is advantageous to arrange a radial projection on each segment and an associated recess on the adjacent machine component. This measure assures that all the segments are fixed, or are only slightly displaceable in the peripheral direction relative to the machine component on which the locking ramps are arranged.
Advantageously the sliding surfaces are formed on the reinforcing ring. The advantage of such a ring is its double function which allows a separate sliding ring to be dispensed with.
DESCRIPTION OF THE DRAWINGS
The invention will now be described with the help of two examples of embodiment shown in the two figures.
FIG. 1 is a perspective fragmentary representation of a freewheel of the invention, and
FIG. 2 is a perspective fragmentary representation of a second embodiment of the freewheel cage of the invention.
FIG. 1 shows a fragmentary view of a freewheel of the invention and associated components. The freewheel cage 1 is disposed between an outer ring 2 and a concentrically arranged shaft 3 and comprises a number of segments 4 which are arranged successively in peripheral direction. Each segment 4 is c
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Hochmuth Harald
Neuwirth Ernst
INA Walzlager Schaeffler KG
Lorence Richard M.
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