ONE-WAY CLUTCH

Abstract: A one-way clutch comprises at least two concentric ring means (1, 2), one of said ring means (1) carrying at least one ratchet pawl (12), and the other of said ring means (2) comprising ratchet teeth (14) which engage said at least one ratchet pawl so as to allow relative rotational movement of said at least two ring means in one rotational direction, and to provide a clutch between those ring means in the opposite rotational direction. At least one of said ring means comprises two identical half rings (3, 4) which are connected to each other and which at least partly enclose the other ring means at axially opposite ends.

Description: One-way clutch The invention is related to a one-way clutch, comprising at least two concentric ring means, one of said ring means carrying at least one ratchet pawl, and the other of said ring means comprising ratchet teeth which engage said at least one ratchet pawl so as to allow relative rotational movement of said at least two ring means in one rotational direction, and to provide a clutch between those ring means in the opposite rotational direction. Such one-way clutches are generally known, and are e.g. applied in the automotive field, in particular in automatic transmissions. The object of the invention is to provide a one-way clutch having a construction which is improved with respect to stiffness, ease of manufacture and durability. This object is achieved in that at least one of said ring means comprises two identical ring halves which are connected to each other and which at least partly enclose the other ring means at axially opposite ends. The ring means which comprises two identical ring halves, is relatively easy and cheap with respect to manufacturing. Moreover, it is possible to provide a sturdy, self- contained unit due to the fact that the other ring means can be enclosed, and therefore be held captive, between the two rings. Preferably, the identical ring halves constitute an inner ring means, each ring half being provided with a radially outwardly extending flange and axially extending sleeve means, said sleeve means fitting together so as to provide a full sleeve. The axially extending sleeve means of both ring halves are interfϊtted in such a way, that a full sleeve is obtained. Preferably, the sleeve means of each ring half comprises at least one axially extending sleeve part which stretches over less than the full circumference of said ring half, said sleeve parts of said ring halves being complementary. According to the most preferred embodiment, each sleeve means of each ring half comprises two sleeve parts, which are regularly spaced in circumferential direction. The ratchet mechanism which provides a fixed coupling between the ring means in one rotational direction, and which allows relative rotations in the other direction, can be carried out in several ways. According to a first possibility, at least one sleeve part is provided with a radially outwardly extending slot, which accommodates a spring-biassed ratchet pawl. In this embodiment, the ratchet pawl is freely translatably in radial direction, a blade spring being provided at its radially inner end for constantly urging the ratchet pawl in radially outward direction. According to an alternative embodiment, a ratchet pawl may be provided which is pivotable. The outer ring means may comprise an axially extending outer sleeve which surrounds the flanges of both rings of the inner ring means, and radially inwardly protruding ratchet teeth accommodated between said flanges. According to a further embodiment, one of the ring means may comprise at least one ratchet pawl which is movable in axial direction, and the other ring means may comprise ratchet teeth on a radially extending surface of said other ring means. The ring halves of the inner ring means may be provided with mutually aligned, axially extending slots accommodating a spring clip for mutually connecting said rings. The invention will be described further with reference to an embodiment of the one-way clutch as shown in the figures. Figure 1 shows a view in perspective of a part of the one-way clutch according to the invention. Figure 2 shows an exploded view. The one-way clutch as shown in figures 1 and 2 comprises an inner ring means 1 and an outer ring means 2. The inner ring means 1 comprises two identical ring halves 3, 4, each being provided with a radially outwardly extending flange 5 and two axially extending sleeve parts 6, 7. The outer ring means comprises an axially extending outer sleeve 8, as well as a radially inwardly extending flange 9. As shown in figure 1, the inner ring halves 3, 4 are assembled in such a way that the sleeve parts 6, 7 thereof constitute a full inner sleeve 10. The ring halves are mutually connected by mans of clips 16, inserted in openings 15. As shown in figures 1 and 2, the inner sleeve 10 comprises radially extending slots 11, accommodating radially translatable ratchet pawls 12, which are biassed by blade springs 13. The inwardly protruding llange 9 of the outer ring means 2 comprises ratchet teeth 14, which engage the ratchet pawls 12. As a result of the co-operation of ratchet pawls 12 and ratchet teeth 14, the inner ring means 1 and outer ring means 2 move in unison in one direction, whereas relative rotation movement are possible in the opposite direction, the ratchet pawls 12 than ratching over the ratchet teeth 14. The inwardly protruding sleeve 9 of the outer ring means 2 is accommodated between the flanges 5 of the ring halves 3, 4. The ring means 1, 2 are provided with splines 18, 19 for connecting them to e.g. a shaft. The ring means 1, 2 may be formed either of a metal or a non-metal. In particular powder forming may be applied. At least one of the ring means 1, 2 is provided with surface grooves 20 for supplying oil to the ratchet teeth 14 and/or ratchet pawl(s) 12. The ring means 1 , 2 may be lubricated and sealed for life.

Claims: Claims 1. One-way clutch, comprising at least two concentric ring means (1, 2), one of said ring means (1) carrying at least one ratchet pawl (12), and the other of said ring means (2) comprising ratchet teeth (14) which engage said at least one ratchet pawl (12) so as to allow relative rotational movement of said at least two ring means (1, 2) in one rotational direction, and to provide a clutch between those ring means (1, 2) in the opposite rotational direction, characterised in that at least one of said ring means comprises two identical ring halves (3, 4) which are connected to each other and which at least partly enclose the other ring means (2) at axially opposite ends. 2. Clutch according to claim 1, wherein the identical rings halves (3, 4) constitute an inner ring means (1), each ring half (3, 4) being provided with a radially outwardly extending flange (5) and axially extending sleeve means (6, 7), said sleeve means (6, 7) fitting together so as to provide a full inner sleeve (10). 3. Clutch according to claim 2, wherein the sleeve means (6, 7) of each ring half (3, 4) comprises at least one axially extending sleeve part (6, 7) which stretches over less than the full circumference of said ring half (3, 4), said sleeve parts (6, 7) of said rings halves (3, 4) being complementary. 4. Clutch according to claim 3, wherein each sleeve means (6, 7) of each ring half (3, 4) comprises two sleeve parts (6, 7) which are regularly spaced in circumferential direction. 5. Clutch according to claim 3 or 4, wherein at least one sleeve part (6, 7) is provided with a radially outwardly extending slot (11), which accommodates a spring biassed ratchet pawl (12). 6. Clutch according to claim 5, wherein the ratchet pawl (12) is freely translatably in radial direction, a (blade) spring (13) being provided at its radially inner end for constantly urging the ratchet pawl (12) in radially outward direction. 7. Clutch according to one of claims 3-6, wherein the outer ring means (2) comprises an axially extending outer sleeve (8) which surrounds the flanges (5) of both rings halves (3, 4), and radially inwardly protruding ratchet teeth (14) accommodated between said flanges (5). 8. Clutch according to claim 1 or 2, wherein one of the ring means comprises at least one ratchet pawl which is movable in axial direction, and the other ring means comprises ratchet teeth on a radially extending surface of said other ring means. 9. Clutch according to one of the preceding claims, wherein the ring halves (3, 4) are provided with mutually aligned, axially extending slots (15) accommodating a spring clip (16) for mutually connecting said ring halves (3, 4). 10. Clutch according to one of the preceding claims, wherein the outer ring means (18) comprises drive means (19), such as splines and/or grooves on its outer surface. 11. Clutch according to one of the preceding claims, wherein the inner ring means (18) comprises drive means (19), such as splines and/or grooves on its inner surface. 12. Clutch according to one of the preceding claims, wherein at least one of the ring means (1, 2) is formed of powder material. 13. Clutch according to one of the preceding claims, wherein at least one of the ring means (1, 2) is provided with surface grooves (20) for supplying oil to the ratchet teeth (14) and/or ratchet pawl(s) (12). 14. Clutch according to one of the preceding claims, wherein the ring means (1, 2) are mutually sealed by means of a labyrinth seal.

Inventors: EYRAUD EMMANUEL JACQUES, KAPAAN HENDRIKUS JAN, LE CALVE MARC MICHEL, EYRAUD, EMMANUEL, JACQUES, KAPAAN, HENDRIKUS, JAN, LE CALVE, MARC, MICHEL
Applicants: EYRAUD EMMANUEL JACQUES, KAPAAN HENDRIKUS JAN, LE CALVE MARC MICHEL, SKF ENG & RES CENTRE BV, EYRAUD, EMMANUEL, JACQUES, KAPAAN, HENDRIKUS, JAN, LE CALVE, MARC, MICHEL, SKF ENGINEERING AND RESEARCH CENTRE B.V.
Application year: 2000
Main classification: F16D41
IPC codes: F16D41