EP0096911A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Stepped ratio-change gearbox
Assignee: Ji Case Europe Ltd
•
Filing: 1983-05-20
•
Granted: —
•
Expires: 2003-05-20
Abstract
Abstract Heavy-duty vehicles such as agricultural tractors frequently have a stepped ratio-change gearbox in series with one or more additional gearboxes one of which is a multi-range and reverse gearbox. To minimise the size, weight and cost of a gearbox providing four ratios, only three gear pairs are employed. The gearbox has co-axial input and output shafts (11 and 12), a parallel layshaft (13) with three integral gears (25,28 and 31), two gears (26 and 29) respectively rotateable on and clutchable to the input and output shafts (11 and 12) and meshing constantly with two of the gears (28 and 31) on the layshaft (13), and a gear (14) rotateable on the input and output shafts (11 and 12), clutchable to either or both of these shafts, and meshing constantly with the other gear (25) on the layshaft (13).
Inventors
- 👤 Eric Charles Hodgson
- 👤 Roger Michael Weyman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 14:28
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/02; F16H3/08; F16H3/087; F16H3/091; F16H3/0915; F16H2200/00; F16H2200/003; F16H2200/0043
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A stepped ratio-change gearbox comprising a casing (10), co-axial input and output shafts (11 and 12), and a layshaft (13) parallel to said shafts, characterised by a gear (14) co-axial with the input and output shafts (11 and 12), freely rotateable relative to and capable of being selectively driveably connected to each of said shafts, and meshing constantly with a gear (25) fixed to the layshaft (13).
Claim 2
Dependent Claim
67 words
A stepped ratio-change gearbox comprising a casing (10), co-axial input and output shafts (11 and 12), and a layshaft (13) parallel to said shafts, characterised by a gear (14) co-axial with the input and output shafts (11 and 12), freely rotateable relative to and capable of being selectively driveably connected to each of said shafts, and meshing constantly with a gear (25) fixed to the layshaft (13).
Claim 3
Dependent Claim
128 words
A stepped ratio-change gearbox according to claim 1, further comprising a pinion (26) freely rotateable on the input shaft (11) and meshing constantly with a wheel (28) fixed to the layshaft (13), a wheel (29) freely rotateable on the output shaft (12) and meshing constantly with a pinion (31) fixed to the layshaft (13), a clutch device associated with the input shaft (11) and capable of selectively driveably connecting to said shaft either the pinion (26) thereon or the gear (14) co-axial with the input and output shafts (11 and 12), and a clutch device associated with the output shaft (12) and capable of selectively driveably connecting to said shaft either the wheel (29) thereon or the gear(14) co-axial with the input and output shafts (11 and 12).
Claim 4
Dependent Claim
18 words
A stepped ratio-change gearbox according to claim 2, wherein the clutch devices are synchromesh clutches (32 and J5).
Claim 5
Dependent Claim
48 words
A stepped ratio-change gearbox according to claim 2 or claim 3, wherein elements (40 and 44) of the clutch devices are connected by means of gear-type couplings (41 and 45) to the respective ends of the gear (14) co-axial with the input and output shafts (11 and 12).
Claim 6
Dependent Claim
56 words
A stepped ratio-change gearbox according to any one of claims 2 to 4, wherein elements (39 and 43) of the clutch devices are respectively connected by means of gear-type couplings (53 and 54) to the pinion (26) freely rotateable on the input shaft (11) and to the wheel (29) freely rotateable on the output shaft (12).
Claim 7
Dependent Claim
44 words
A stepped ratio-change gearbox according to any oneof the preceding claims, wherein the gear (14) co-axial with the input and output shafts (11 and 12) is journalled in the casing (10), and the adjacent ends of said shafts are each journalled in said gear.
Claim 8
Dependent Claim
35 words
A stepped ratio-change gearbox according to claim 6, wherein the gear (14) co-axial with the input and output shafts (11 and 12) is journalled in two parallel webs (20 and 21) of the casing (10).
Claim 9
Dependent Claim
33 words
A stepped ratio-change gearbox according to any one of the preceding claims, wherein the input and output shafts (11 and 12) are tubular and a power take-off shaft (47) passes co-axially through them.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.