US 11,873,866 B2Granted

Transmission system

AssigneeZeroshift Transmissions Limited

InventorNeil Quinn

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Abstract

A transmission system including a first gear rotatably mounted on an input shaft; a second gear mounted on a lay shaft; a selector that selectively locks first and second gears for rotation with the input shaft and includes a single engagement ring with a first side having a first set of engagement elements each having a drive face that drivingly engages in a first rotational direction a first set of drive formations of the first gear and a non-driving face that slips with respect to the first set of drive formations in a second rotational direction, and a second side having a second set of engagement elements each having a drive face that drivingly engages in the second rotational direction a second set of drive formations of the second gear and a non-driving face that slips with respect to the second set of drive formations in the first rotational direction.

Claims34

Dependent claims

A transmission system, including:

a first input shaft that is arranged to receive drive directly from a drive source;
a second input shaft that is arranged to receive drive from the drive source via a drive interruption means;
a first lay shaft;
a gear element rotatably mounted on the first input shaft;
a gear element mounted on the first lay shaft;
and
a first selector assembly arranged to selectively lock the gear element rotatably mounted on the first input shaft for rotation with the first input shaft and to selectively lock the gear element mounted on the first lay shaft for rotation with the first input shaft,
the first selector assembly comprising a single engagement ring that includes:
a first side including a first set of engagement elements, wherein each engagement element in the first set of engagement elements includes a first drive face arranged to drivingly engage in a first rotational direction a first set of drive formations associated with the gear element rotatably mounted on the first input shaft and a first non-driving face that is arranged to slip with respect to the first set of drive formations in a second rotational direction, thereby preventing driving engagement with the first set of drive formations, and
a second side including a second set of engagement elements, wherein each engagement element in the second set of engagement elements includes a second drive face arranged to drivingly engage in the second rotational direction a second set of drive formations associated with the gear element mounted on the first lay shaft and a second non-driving face that is arranged to slip with respect to the second set of drive formations in the first rotational direction, thereby preventing driving engagement with the second set of drive formations,
wherein each of the first non-driving faces extends circumferentially along a first arcuate path from a first position adjacent its respective first drive face, and the arcuate extent of each first non-driving face is in the range 90° to 360°, and
wherein each of the second non-driving faces extends circumferentially along a second arcuate path from a second position adjacent its respective second drive face, and the arcuate extent of each second non-driving face is in the range 90° to 360°.

9 more elements

A transmission system, including:

a first input shaft that is arranged to receive drive directly from a drive source;
a second input shaft that is arranged to receive drive from the drive source via a drive interruption means;
a first lay shaft;
a gear element rotatably mounted on the first input shaft;
a gear element mounted on the first lay shaft;
and
a first selector assembly arranged to selectively lock the gear element rotatably mounted on the first input shaft for rotation with the first input shaft and to selectively lock the gear element mounted on the first lay shaft for rotation with the first input shaft,
the first selector assembly comprising a single engagement ring that includes:
a first side including a first set of engagement elements, wherein each engagement element in the first set of engagement elements includes a first drive face arranged to drivingly engage in a first rotational direction a first set of drive formations associated with the gear element rotatably mounted on the first input shaft and a first non-driving face that is arranged to slip with respect to the first set of drive formations in a second rotational direction, thereby preventing driving engagement with the first set of drive formations, and
a second side including a second set of engagement elements, wherein each engagement element in the second set of engagement elements includes a second drive face arranged to drivingly engage in the second rotational direction a second set of drive formations associated with the gear element mounted on the first lay shaft and a second non-driving face that is arranged to slip with respect to the second set of drive formations in the first rotational direction, thereby preventing driving engagement with the second set of drive formations,
wherein each of the first non-driving faces extends circumferentially along a respective first arcuate path from a first position adjacent its first drive face to a third position adjacent the first drive face of an adjacent one of the engagement elements in the first set of engagement elements, and
wherein each of the second non-driving faces extends circumferentially along a respective second arcuate path from a second position adjacent its second drive face to a fourth position adjacent the second drive face of an adjacent one of the engagement elements in the second set of engagement elements.

9 more elements

A transmission system, including:

a first input shaft that is arranged to receive drive directly from a drive source;
a second input shaft that is arranged to receive drive from the drive source via a drive interruption means;
a first lay shaft;
a gear element rotatably mounted on the first input shaft;
a gear element mounted on the first lay shaft;
a first selector assembly arranged to selectively lock the gear element rotatably mounted on the first input shaft for rotation with the first input shaft and to selectively lock the gear element mounted on the first lay shaft for rotation with the first input shaft,
the first selector assembly comprising a single engagement ring that includes:
a first side including a first set of engagement elements, wherein each engagement element in the first set of engagement elements includes a first drive face arranged to drivingly engage in a first rotational direction a first set of drive formations associated with the gear element rotatably mounted on the first input shaft and a first non-driving face that is arranged to slip with respect to the first set of drive formations in a second rotational direction, thereby preventing driving engagement with the first set of drive formations, and
a second side including a second set of engagement elements, wherein each engagement element in the second set of engagement elements includes a second drive face arranged to drivingly engage in the second rotational direction a second set of drive formations associated with the gear element mounted on the first lay shaft and a second non-driving face that is arranged to slip with respect to the second set of drive formations in the first rotational direction, thereby preventing driving engagement with the second set of drive formations,
wherein each of the first non-driving faces extends circumferentially along a respective first arcuate path from a first position adjacent its first drive face,
wherein each of the second non-driving faces extends circumferentially along a respective second arcuate path from a second position adjacent its second drive face,
wherein the number of engagement elements on the first side of the engagement ring is less than or equal to two, and
wherein the number of engagement elements on the second side of the engagement ring is less than or equal to two.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/416,437Filed 2 Sep 2019
Priority: GB 182075019 Dec 2018
Published: US 2022/0120321 A121 Apr 2022
Granted: 16 Jan 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

F16D 11/10
Actuated by moving a non-rotating part axially: with clutching members movable only axially
F16H 3/006
Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion: power being selectively transmitted by…
F16H 61/0437
Smoothing ratio shift: by using electrical signals
F16H 61/688
Without interruption of drive: with two inputs, e.g. selection of one of two torque-flow paths by clutches