EP0034451A2
Expired / Lapsed
EP
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Improvements in flywheel mechanisms for fluid-pressure operated anti-skid braking systems
Assignee: ZF International UK Ltd
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Filing: 1981-02-09
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Granted: —
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Expires: 2001-02-09
Abstract
Abstract in an anti-skid braking system, a flywheel mechanism (3) comprises a flywheel (6) rotatably mounted on a shaft (2) driven from a braked wheel for axial movement relative to the shaft (2), a thrust member (8) mounted on, and keyed against rotation and axial movement with respect to, the shaft (2), and a ball and ramp mechanism 11 located between the thrust member (8) and a reaction plate (13) in clutched engagement with the flywheel (16). The ball and ramp mechanism comprises balls (19) located in angularly spaced recesses (16, 17) in adjacent faces of the thrust member (8) and the reaction plate (13). Relative rotation between the thrust member (8) and the reaction plate (13) causes the balls (19) to ride up ramps defined by the sides of the recesses (16,17) to move the flywheel (6) axially away from the thrust member (8). Upon such movement the flywheel (6) acts on a lever (24) to operate a dump valve (5) for controlling a brake-applying fluid-pressure. An overrun clutch (44) between the flywheel (6) and the reaction plate (13) allows operation of the dump valve (5) to be maintained when the ball and ramp mechanism (11) is fully expanded.
Inventors
- 👤 Glyn Phillip Reginald Farr
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 22:55
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/72; B60T8/74
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
258 words
A flywheel mechanism for a fluid-pressure operated anti-skid braking system comprising a flywheel (6) which is rotatably mounted on a shaft (2) adapted to be driven from a braked wheel, a thrust member (8) mounted on, and keyed against rotation with respect to, the shaft (2), and camming means (11) disposed between the flywheel (6) and the thrust member (8) and through which rotation of the shaft (2) is imparted to the flywheel (6) from the thrust member (8), the camming means (11) being so constructed and arranged that relative rotation between the flywheel (6) and the thrust member (8) as a result of excessive deceleration of the shaft (2) is accompanied by relative movement between the flywheel (6) and the thrust member (8) in an axial direction to operate pressure-regulating means for controlling a brake-applying fluid-pressure, characterised in that the thrust member (8) is keyed against rotation and axial movement with respect to the shaft (2), and the flywheel (6) is mounted on the shaft (2) for relative axial movement and relative rotation with respect to the shaft (2) as dictated by the camming means (11), the flywheel (6) being adapted to co-operate with the pressure-regulating means, and the camming means (11) being separate from the mounting (7) for the flywheel (6) on the shaft (2) and located between the thrust member (8) and a second member (13) in clutched engagement with the flywheel (6) so that the flywheel (6) can overrun to maintain operation of the pressure-regulating means when the camming means (11) is fully expanded.
Claim 2
Dependent Claim
258 words
A flywheel mechanism for a fluid-pressure operated anti-skid braking system comprising a flywheel (6) which is rotatably mounted on a shaft (2) adapted to be driven from a braked wheel, a thrust member (8) mounted on, and keyed against rotation with respect to, the shaft (2), and camming means (11) disposed between the flywheel (6) and the thrust member (8) and through which rotation of the shaft (2) is imparted to the flywheel (6) from the thrust member (8), the camming means (11) being so constructed and arranged that relative rotation between the flywheel (6) and the thrust member (8) as a result of excessive deceleration of the shaft (2) is accompanied by relative movement between the flywheel (6) and the thrust member (8) in an axial direction to operate pressure-regulating means for controlling a brake-applying fluid-pressure, characterised in that the thrust member (8) is keyed against rotation and axial movement with respect to the shaft (2), and the flywheel (6) is mounted on the shaft (2) for relative axial movement and relative rotation with respect to the shaft (2) as dictated by the camming means (11), the flywheel (6) being adapted to co-operate with the pressure-regulating means, and the camming means (11) being separate from the mounting (7) for the flywheel (6) on the shaft (2) and located between the thrust member (8) and a second member (13) in clutched engagement with the flywheel (6) so that the flywheel (6) can overrun to maintain operation of the pressure-regulating means when the camming means (11) is fully expanded.
Claim 3
Dependent Claim
30 words
A flywheel mechanism according to Claim 1, characterised in that the thrust member (8) is keyed to the shaft (2) by a single key (40) or a radial pin (10).
Claim 4
Dependent Claim
43 words
A flywheel mechanism according to Claim 1 or Claim 2, characterised in that the flywheel (6) is journalled for rotation on a plain bearing (38) or a roller bearing (7) on the shaft (2) on which the flywheel (6) is also axially slidable.
Claim 5
Dependent Claim
32 words
4 . A flywheel mechanism according to Claim 3, characterised in that the bearing (38 or 7) is directly beneath the mass centre of the flywheel (6) to provide a balanced assebly.
Claim 6
Dependent Claim
40 words
5 A flywheel mechanism acording to any preceding claim, characterised in that the flywheel (6) is urged by a spring (20 or 33) towards the thrust member (8) so ,that the camming means (11) is clamped therebetween at all times.
Claim 7
Dependent Claim
102 words
A flywheel mechanism according to any preceding claim, characterised in that the camming means (11) comprises a ball and ramp mechanism in which balls (19) are located in angularly spaced recesses (16 and 17) in adjacent faces of the thrust member (8) and the second member (13) which comprises a reaction plate, relative rotation between the thrust member (8) and the reaction plate (13) at least in one direction causing the balls (19) to ride up ramps defined by the sides of the recesses (16 and 17) to cause the flywheel (6) to be urged axially away from the thrust member (8).
Claim 8
Dependent Claim
76 words
A flywheel mechanism according to Claim 6, characterised in that the reaction plate (13) is mounted on the hub (14) of the flywheel (6) by means of a one-way drive unit (15) of the roller type, an annular clearance (10a) being provided between the thrust member (8) and the shaft (2) so that the thrust member (8) can move radially through a limited distance to compensate for tolerance variations in the ball and ramp mechanism (11).
Claim 9
Dependent Claim
77 words
A flywheel mechanism according to Claim 6, characterised in that the reaction plate (13) is coupled to the flywheel (6) by means of a pawl and ratchet device (30) of the face type, an annular clearance (31) being provided between the reaction plate (13) and the hub (14) of the flywheel (6) so that the reaction plate (13) can move radially through a limited distance to compensate for tolerance variations in the ball and ramp mechanism (11).
Claim 10
Dependent Claim
77 words
A flywheel mechanism according to any preceding claim, characterised in that the flywheel (6) acts on the inner end of a lever (24) to operate a dump valve (5) which comprises the pressure-regulating means, the lever (24) being pivotably mounted at an intermediate point in its length, and a spring (25) being provided to act on the lever (24) to urge the outer end of the lever (24) in a direction to close the dump valve (5).
Claim 11
Dependent Claim
85 words
A flywheel mechanism according to Claim 9 as appended to Claim 5, characterised in that the flywheel (6) acts on the inner end of the lever (24) through a thrust bearing (32) contained within a cage (37), the spring (20) which urges the flywheel (6) towards the thrust member (8) acting between the thrust bearing (32) and a sleeve (34) which is pressed onto the shaft (2) and is slotted to receive projections (36) on the cage (37) to prevent the cage (37) from rotating.
References Cited (Backward Citations)
No citation records indexed.
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