Gear change device for a motor vehicle
First Claim
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1. Gear change device for a motor vehicle, comprising:
- a first primary shaft and a second primary shaft coaxial with respect to each other, selectively connectable a driving shaft of the motor vehicle by a double clutch engagement device,a first secondary shaft and a second secondary shaft, whose axes are parallel and spaced from the common axis of said primary shafts, and having respective output pinions intended to mesh with a gear wheel of a differential,a plurality of pairs of gear wheels, corresponding to a plurality of forward gear ratios and to at least one reverse gear ratio, wherein the gear wheels of each pair are one rigidly connected in rotation with one of the primary shafts or with one of the secondary shafts while the other is freely rotatable on one of the secondary shafts or on one of the primary shafts, respectivelya plurality of gear selector devices for rotatably coupling each of said freely rotatable gear wheels with the shaft on which it is mounted,wherein the reverse gear ratio is defined by;
a first reverse gear wheel mounted freely rotatable on the first secondary shaft and connectable in rotation with the first secondary shaft by one of said selector devices, with the aim of selecting the reverse gear,at least one rotatable actuator drum, for controlling said selector devices, having a plurality of cam tracks,wherein said selector devices include respective fork-like actuator members slidably mounted in a direction parallel to the axes of said primary and secondary shafts and each having a cam follower element engaged in a respective cam track of said at least one actuator drum, wherein each pair of cam tracks adjacent to each other provided on said at least one actuator drum controls fork-like actuator members, each of said cam tracks associated to different secondary shafts and have the cam follower elements thereof engaged on said at least one drum in positions angularly spaced with respect to each other; and
said cam tracks of said at least one actuator drum comprise a first track, a second track, a third track and a fourth track;
said first track extending in a first substantially circumferential direction, a first track portion of said first track extending axially toward said second track and away from a remainder of said first track, said first track having a first width with a first axial dimension;
said second track extending in a second substantially circumferential direction, a second track portion of second track extending axially toward said first track and away from a second remainder of said second track, said second track having a second width with a second axial dimension;
said first track portion extending axially onto a second circumference of said at least one actuator drum occupied by said second width and said second track portion extending axially onto a first circumference of said at least one actuator drum occupied by said first width such that said first track and said second track axially overlap to occupy a common circumference;
said first track and said second track independent from and avoiding intersecting with each other, and said third track and said fourth track independent from and avoiding intersecting with each other;
said first track engaged with a first cam follower element of the cam follower elements and said second track engaged with a second cam follower element of the cam follower elements, said first can follower element and said second cam follower element independent from each other; and
said third track engaged with a third cam follower element of the cam follower elements and said fourth track engaged with a fourth cam follower element of the cam follower elements, said third cam follower element and said fourth cam follower element independent from each other.
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Abstract
A gear change device for including a first and a second primary shaft, selectively connectable to a driving shaft of a motor vehicle by a double clutch engagement device, and a first and a second secondary shaft. A plurality of gear selector devices rotatably couples each of the freely rotatable gear wheels with the shaft on which it is mounted, and, at least one rotatable actuator drum, for controlling the selector devices, having a plurality of cam tracks. The selector devices include respective fork-like actuator members and each has a cam follower element engaged in a respective cam track of the respective actuator drum. Each pair of cam tracks adjacent to each other provided on an actuator drum controls fork-like actuator members which are associated to different secondary shafts and which have the can follower elements thereof engaged on the drum in positions angularly spaced with respect to each other.
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Citations
20 Claims
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1. Gear change device for a motor vehicle, comprising:
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a first primary shaft and a second primary shaft coaxial with respect to each other, selectively connectable a driving shaft of the motor vehicle by a double clutch engagement device, a first secondary shaft and a second secondary shaft, whose axes are parallel and spaced from the common axis of said primary shafts, and having respective output pinions intended to mesh with a gear wheel of a differential, a plurality of pairs of gear wheels, corresponding to a plurality of forward gear ratios and to at least one reverse gear ratio, wherein the gear wheels of each pair are one rigidly connected in rotation with one of the primary shafts or with one of the secondary shafts while the other is freely rotatable on one of the secondary shafts or on one of the primary shafts, respectively a plurality of gear selector devices for rotatably coupling each of said freely rotatable gear wheels with the shaft on which it is mounted, wherein the reverse gear ratio is defined by; a first reverse gear wheel mounted freely rotatable on the first secondary shaft and connectable in rotation with the first secondary shaft by one of said selector devices, with the aim of selecting the reverse gear, at least one rotatable actuator drum, for controlling said selector devices, having a plurality of cam tracks, wherein said selector devices include respective fork-like actuator members slidably mounted in a direction parallel to the axes of said primary and secondary shafts and each having a cam follower element engaged in a respective cam track of said at least one actuator drum, wherein each pair of cam tracks adjacent to each other provided on said at least one actuator drum controls fork-like actuator members, each of said cam tracks associated to different secondary shafts and have the cam follower elements thereof engaged on said at least one drum in positions angularly spaced with respect to each other; and said cam tracks of said at least one actuator drum comprise a first track, a second track, a third track and a fourth track; said first track extending in a first substantially circumferential direction, a first track portion of said first track extending axially toward said second track and away from a remainder of said first track, said first track having a first width with a first axial dimension; said second track extending in a second substantially circumferential direction, a second track portion of second track extending axially toward said first track and away from a second remainder of said second track, said second track having a second width with a second axial dimension; said first track portion extending axially onto a second circumference of said at least one actuator drum occupied by said second width and said second track portion extending axially onto a first circumference of said at least one actuator drum occupied by said first width such that said first track and said second track axially overlap to occupy a common circumference; said first track and said second track independent from and avoiding intersecting with each other, and said third track and said fourth track independent from and avoiding intersecting with each other; said first track engaged with a first cam follower element of the cam follower elements and said second track engaged with a second cam follower element of the cam follower elements, said first can follower element and said second cam follower element independent from each other; and said third track engaged with a third cam follower element of the cam follower elements and said fourth track engaged with a fourth cam follower element of the cam follower elements, said third cam follower element and said fourth cam follower element independent from each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Gear change device for a motor vehicle, comprising:
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a first primary shaft and a second primary shaft coaxial with respect to each other, selectively connectable a driving shaft of the motor vehicle by a double clutch engagement device, a first secondary shaft and a second secondary shaft, whose axes are parallel and spaced from the common axis of said primary shafts, and having respective output pinions intended to mesh with a gear wheel of a differential, a plurality of pairs of gear wheels, corresponding to a plurality of forward gear ratios and to at least one reverse gear ratio, wherein the gear wheels of each pair are one rigidly connected in rotation with one of the primary shafts or with one of the secondary shafts while the other is freely rotatable on one of the secondary shafts or on one of the primary shafts, respectively a plurality of gear selector devices for rotatably coupling each of said freely rotatable gear wheels with the shaft on which it is mounted, wherein the reverse gear ratio is defined by; a first reverse gear wheel mounted freely rotatable on the first secondary shaft and connectable in rotation with the first secondary shaft by one of said selector devices, with the aim of selecting the reverse gear, at least one rotatable actuator drum, for controlling said selector devices, having a plurality of cam tracks, wherein said selector devices include respective fork-like actuator members slidably mounted in a direction parallel to the axes of said primary and secondary shafts and each having a cam follower element engaged in a respective cam track of said at least one actuator drum, wherein each pair of cam tracks adjacent to each other provided on said at least one actuator drum controls fork-like actuator members which are associated to different secondary shafts and which have the cam follower elements thereof engaged on said at least one drum in positions angularly spaced with respect to each other, and two pairs of cam tracks, the cam tracks of each pair, which are associated to different secondary shafts, controls either all even or all odd forward gears; the cam tracks of each pair independent from and avoiding intersecting with each other; a first cam track of the cam tracks of each pair engaged with a first cam follower element of the cam follower elements and a second cam track of the cam tracks of each pair engaged with a second cam follower element of the cam follower elements, said first cam follower element and said second cam follower element independent from each other. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. Gear change device for a motor vehicle, comprising:
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a first primary shaft and a second primary shaft coaxial with respect to each other, selectively connectable a driving shaft of the motor vehicle by a double clutch engagement device, a first secondary shaft and a second secondary shaft, whose axes are parallel and spaced from the common axis of said primary shafts, and having respective output pinions intended to mesh with a gear wheel of a differential, a plurality of pairs of gear wheels, corresponding to a plurality of forward gear ratios and to at least one reverse gear ratio, wherein the gear wheels of each pair are one rigidly connected in rotation with one of the primary shafts or with one of the secondary shafts while the other is freely rotatable on one of the secondary shafts or on one of the primary shafts, respectively a plurality of gear selector devices for rotatably coupling each of said freely rotatable gear wheels with the shaft on which it is mounted, wherein the reverse gear ratio is defined by; a first reverse gear wheel mounted freely rotatable on the first secondary shaft and connectable in rotation with the first secondary shaft by one of said selector devices, with the aim of selecting the reverse gear, at least one rotatable actuator drum, for controlling said selector devices, having a plurality of cam tracks, wherein said selector devices include respective fork-like actuator members slidably mounted in a direction parallel to the axes of said primary and secondary shafts and each having a cam follower element engaged in a respective cam track of said at least one actuator drum, wherein each pair of cam tracks adjacent to each other provided on said at least one actuator drum controls fork-like actuator members which are associated to different secondary shafts and which have the cam follower elements thereof engaged on said at least one drum in positions angularly spaced with respect to each other, and wherein each of said fork-like actuator members has an extended body with a fork-shaped end and the opposite end carrying the respective cam follower element, and the axes of the two secondary shafts and the common axis of said primary shafts have a triangular arrangement, with said secondary shafts arranged on one side, with respect to said common axis, which is diametrically opposite to the side on which said at least one drum is arranged, said actuator members having the extended bodies thereof shaped with a curvature surrounding said primary shafts such that said primary shafts are located between interior arm portions of said body of each of said actuator members; wherein said body of each fork-like actuator member being slidably mounted on a pair of guide rods spaced from each other and parallel to the axes of said primary and secondary shafts. - View Dependent Claims (17, 18, 19, 20)
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Specification
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Current AssigneeC.R.F. Societa Consortile Per Azioni
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Original AssigneeCefla Societa' Cooperativa
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InventorsPregnolato, Gianluigi, Piacenza, Gianni, Piazza, Andrea
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Primary Examiner(s)Kelleher, William
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Assistant Examiner(s)Elahmadi, Zakaria
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Application NumberUS13/306,628Publication NumberTime in Patent Office1,246 DaysField of Search743/31US Class Current74/331CPC Class CodesF16H 2003/0931 each countershaft having an...F16H 2063/025 Final output mechanisms for...F16H 2200/0056 the gear ratios comprising ...F16H 3/006 power being selectively tra...F16H 3/093 with two or more countershaftsF16H 61/688 with two inputs, e.g. selec...F16H 63/18 the final actuating mechani...Y10T 74/19233 Plurality of counter shaftsY10T 74/19288 Double clutch and interpose...
