Rolls-Royce Archives
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Rolls-Royce Experimental Archives                
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DescriptionDateIdentifier
Forwarding blueprints for a 'central change' modification and discussing related parts.8th Dec 1938Box 104 \ 3  scan0239
Cost and parts required to fit a central change to a Wraith chassis.21th Nov 1938Box 104 \ 3  scan0240
Photographs of a centre change speed gearbox modification for a Bentley.25th Oct 1938Box 104 \ 3  scan0241
Complaint of a knock from the change speed lever in top gear on a Bentley, caused by the selector lever fouling the speedometer drive shaft.8th Jul 1938Box 104 \ 3  scan0242
Decision to not proceed with cold Fescol depositing for Bentley gearbox shafts due to the high cost.15th Nov 1937Box 104 \ 3  scan0243
Tables of box ratios and overall ratios for a 'D' style gearbox, noted as 'Bentley old'.16th Oct 1937Box 104 \ 3  scan0244
The examination and repair of Bentley Gearbox 3rd Motion Shafts.16th Oct 1937Box 104 \ 3  scan0245
Excessive wear on two Bentley gearbox third motion shafts and a proposal for repair.13th Oct 1937Box 104 \ 3  scan0246
Failure of a Bentley gearbox bearing due to an overly tight fit in the casing.15th Jun 1937Box 104 \ 3  scan0247
Bentley third gear complaint and the subsequent repair.13th Feb 1937Box 104 \ 3  scan0248
Two faults found on a Bentley, an oil leak from the gearbox and a damaged rear axle pinion.13th Nov 1936Box 104 \ 3  scan0249
Preliminary drawings and alternative designs for a 'Japan 3' gearbox, focusing on the reverse pinion mechanism.23th Jan 1931Box 104 \ 4  scan0001
Hand-drawn schematic of a gearbox mechanism with annotations.25th Jan 1931Box 104 \ 4  scan0002
Technical memorandum discussing the design of an eccentrically engaged reverse gear pinion with rounded teeth.25th Jan 1931Box 104 \ 4  scan0003
Page discussing alternative gearbox designs with a corresponding gear layout sketch.25th Jan 1931Box 104 \ 4  scan0004
Sketch of a swinging reverse mechanism with a reverse slider.25th Jan 1931Box 104 \ 4  scan0005
Final recommendation sketch for a shaft and pinion assembly within a box or housing.31th Jan 1931Box 104 \ 4  scan0006
Revisions to the Japan 3 gearbox, specifically the inclusion of Maybach jaws.31th Jan 1931Box 104 \ 4  scan0007
Providing suggestions for the improvement of the Japan 3. Gearbox design.3rd Feb 1931Box 104 \ 4  scan0008
Unfinished proposal for a Japan 3 gearbox actuating mechanism, comparing it to other designs.4th Feb 1931Box 104 \ 4  scan0009
Secret memo regarding gearbox arrangement schemes for the 'Japan 3' project.2nd Jul 1931Box 104 \ 4  scan0010
Secret memorandum discussing two alternative proposals for modifying the Japan 3 gearbox, specifically concerning the mounting of the reverse wheel.2nd Dec 1931Box 104 \ 4  scan0011
Secret memo providing a technical review and feedback on the 'Japan Gearbox' design, including its gears, serrations, and sliders.25th Feb 1931Box 104 \ 4  scan0012
Sending schemes and particulars for the Japan 3 gearbox casing.2nd Mar 1931Box 104 \ 4  scan0013
Required alterations to easy-change silent gearboxes, specifically concerning the neutral position.2nd Mar 1931Box 104 \ 4  scan0014
Gearbox design improvements, comparing various models like Maybach and epicyclic, and future plans.9th Mar 1931Box 104 \ 4  scan0015
Design choices for the Japan 3 gearbox, comparing new N. schemes with existing 25HP and P.2 models for cost-effectiveness.10th Mar 1931Box 104 \ 4  scan0016
Scheme to incorporate a Warner Synchronising mechanism into the Japan III gearbox.14th Mar 1931Box 104 \ 4  scan0017
Issue of rattling side shaft gears and proposing a programme of tests to find a solution.16th Mar 1931Box 104 \ 4  scan0018
The investigation and resolution of gearbox oscillation on the 25 HP model.11th May 1931Box 104 \ 4  scan0019
Design of a future 25HP synchro-mesh gearbox, comparing it with Buick's design.28th May 1931Box 104 \ 4  scan0020
Technical memo investigating the cause and potential solutions for a gear rattle issue on the 25 HP model.29th May 1931Box 104 \ 4  scan0021
Experimenting with a flexible drive between the flywheel and gearbox, noting gear rattle issues.29th May 1931Box 104 \ 4  scan0022
Investigating the cause of gear rattles on a 25 HP engine, linking it to heavier cast iron pistons.9th Jun 1931Box 104 \ 4  scan0023
Questioning the efficacy of the oiling scheme for the 20/25HP Gear Box.10th Jun 1931Box 104 \ 4  scan0024
Technical update on gearbox designs for the 25HP and 45HP car models, detailing the synchro-mesh and a new friction-operated unit.12th Jun 1931Box 104 \ 4  scan0025
New gearbox with synchro-mesh actuation, its mechanism, and modifications required to fit it to an existing 20/25 model.15th Jun 1931Box 104 \ 4  scan0026
Slight alteration to the synchro-mesh gearbox and existing servo gear.20th Jun 1931Box 104 \ 4  scan0027
Accompanying schematics for the J.A. Gearbox, specifically for the servo shaft, speedometer drive, and a modification to the change gear pendulum lever.23th Jun 1931Box 104 \ 4  scan0028
The J.4 Synchro Mesh Gearbox, requesting figures on the gear lever load and movement of a Buick for comparison.1st Jun 1931Box 104 \ 4  scan0029
Modification to a gearbox, incorporating a delay action cam surface on the synchromesh mechanism inspired by a Buick design.2nd Jul 1931Box 104 \ 4  scan0030
Sending additional schemes (3290, 3301, 3302) and information for the J.4. Gearbox.1st Jul 1931Box 104 \ 4  scan0031
Flywheel vibration and gear rattle for a 25 HP engine, testing a stiffened flywheel and fabric joint.8th Jul 1931Box 104 \ 4  scan0032
Design drawing for a Hardy Coupling for a clutch.10th Jul 1931Box 104 \ 4  scan0033
Modifications to the Japan 4 model's gearbox clutch pit and pedal.10th Jul 1931Box 104 \ 4  scan0034
Assembly method and design discrepancies of the J. 4. Gearbox.13th Jul 1931Box 104 \ 4  scan0035
The filling plug, level stick, and cover for the J.4. gearbox.4th Jul 1931Box 104 \ 4  scan0036
Standardising adjustable pedals and modifying the clutch pedal for the 25 HP synchro-mesh gearbox.15th Jul 1931Box 104 \ 4  scan0037
Modifications to the gearbox, clutch operating shaft, and brake compensator shaft.16th Jul 1931Box 104 \ 4  scan0038
Despatched schematic and modifications to the J.4. gearbox, universal joint, and pendulum lever.20th Jul 1931Box 104 \ 4  scan0039
Modifications to the J.4 gearbox servo for the 20/25 model.21th Jul 1931Box 104 \ 4  scan0040
Modifications to the universal joint flange piece and a sheet metal baffle for the gearbox.23th Jul 1931Box 104 \ 4  scan0041
Modifications to the J.4. gearbox, change gear lever, and brake pedal mechanism.24th Jul 1931Box 104 \ 4  scan0042
Modifications to a 20/25 gearbox with synchronous mesh.26th Aug 1931Box 104 \ 4  scan0043
Issue of sticking cones in a synchromesh gearbox, with references to Buick's instructions and cone angles.19th Sep 1931Box 104 \ 4  scan0044
Gearbox component alignment and friction reduction, suggesting a trial of a bronze stirrup.22th Sep 1931Box 104 \ 4  scan0045
Performance of a 25 HP synchromesh gearbox after road testing and comparison.22th Sep 1931Box 104 \ 4  scan0046
On the successful development of a new synchro-mesh gearbox with a silent 3rd gear.26th Sep 1931Box 104 \ 4  scan0047
Dynamometer test report on a 25 HP synchro-mesh gearbox.3rd Oct 1931Box 104 \ 4  scan0048
Modifications requested by the Experimental Department for the J. 3 and 4 gearbox.6th Oct 1931Box 104 \ 4  scan0049
Testing the reverse gear and the number of keys required for the J. 3 & 4 gearbox.1st Oct 1931Box 104 \ 4  scan0050
Adoption of a synchro mesh gearbox versus a new design based on two epicyclic gear units.28th Oct 1931Box 104 \ 4  scan0051
Different ideas for a gearbox scheme, including epicyclic units and synchronised brakes.20th Oct 1931Box 104 \ 4  scan0052
Development and implementation of easy change and synchro-mesh gearboxes for various car models.20th Oct 1931Box 104 \ 4  scan0053
Note expressing concern over gearbox development and the immediate needs of the Phantom II model.20th Oct 1931Box 104 \ 4  scan0054
Development and urgency of an easy-change gearbox with synchro-mesh and silent third gear.21th Oct 1931Box 104 \ 4  scan0055
Ongoing difficulties with noisy gears in 25 HP synchro-mesh gearboxes, recommending the immediate purchase of gear grinding equipment.23th Oct 1931Box 104 \ 4  scan0056
Fitting and testing two different synchro mesh gearboxes.22th Oct 1931Box 104 \ 4  scan0057
Test report on the reverse gear of a 25 HP synchromesh gearbox.24th Oct 1931Box 104 \ 4  scan0058
Correcting a fault where two gears were meshing simultaneously in the 25 HP synchromesh gearbox.26th Oct 1931Box 104 \ 4  scan0059
Design detail for the 25HP Synchro Mesh Gearbox.26th Oct 1931Box 104 \ 4  scan0060
Technical memo on the 'China' easy change gearbox, discussing reverse gear engagement, seizing bushes, and gear creep.27th Oct 1931Box 104 \ 4  scan0061
Two proposals to improve lubrication of the reverse shaft for the 25 HP Synchro Mesh Gearbox.3rd Nov 1931Box 104 \ 4  scan0062
Bearing tests and shaft hardening for a Synchro Mesh Gearbox.1st Nov 1931Box 104 \ 4  scan0063
Modifications to a cast iron gearbox.10th Nov 1931Box 104 \ 4  scan0064
Technical memorandum on overcoming reverse gear issues in the 25 HP synchromesh gearbox.11th Nov 1931Box 104 \ 4  scan0065
Drawing showing modifications to a synchromesh gearbox reverse shaft to increase stiffness.11th Nov 1931Box 104 \ 4  scan0066
Requesting confirmation to modify the 25 HP reverse gear on the easy change gearbox before production.13th Nov 1931Box 104 \ 4  scan0067
Requesting modifications to reverse shafts for synchro-mesh gearboxes.17th Nov 1931Box 104 \ 4  scan0068
Stiffening of the reverse shaft for the 25 HP synchro mesh gearbox.17th Nov 1931Box 104 \ 4  scan0069
Criticisms and potential solutions for the Synchro Mesh Gearbox bearings.18th Nov 1931Box 104 \ 4  scan0070
Load calculations and adequacy of the spigot bearing in the 25HP Synchro Mesh Gearbox.1st Nov 1931Box 104 \ 4  scan0071
Experiment to adapt a reverse gear for the 20/25 HP synchro mesh gearbox.24th Nov 1931Box 104 \ 4  scan0072
Sending a striking mechanism scheme for the 25HP Synchro Mesh Gearbox.26th Nov 1931Box 104 \ 4  scan0073
Cross-sectional diagram of a mechanical assembly featuring a rubber block.1st Dec 1931Box 104 \ 4  scan0074
Permanent lubrication scheme for the 25 HP gearbox.1st Dec 1931Box 104 \ 4  scan0075
Updated method for lubricating the reverse shaft on all synchro mesh gearboxes.1st Dec 1931Box 104 \ 4  scan0076
Modifications to the side levers for the 25HP Synchromesh Gearbox.5th Dec 1931Box 104 \ 4  scan0077
Analysis of gearbox noise and other issues in a 25 HP Synchromesh system.15th Dec 1931Box 104 \ 4  scan0078
Gearbox performance, detailing issues with gear noise, engagement, and different gear specifications.15th Dec 1931Box 104 \ 4  scan0079
The road test of the 20-G-4 Special Touring Saloon, noting issues with its gearbox and comparing performance to a Trials car.17th Dec 1931Box 104 \ 4  scan0080
Experiments to improve the silence of the 25 HP Synchro Mesh Gearbox helical trains.19th Dec 1931Box 104 \ 4  scan0081
Issue of top gear working out on a 25HP Synchro Mesh Gearbox.19th Dec 1931Box 104 \ 4  scan0082
Experiments to prevent the top gear disengaging on a 25HP synchromesh gearbox.21th Dec 1931Box 104 \ 4  scan0083
Experiments to improve idling noise and test the reverse gear on a 25 HP synchromesh gearbox.23th Dec 1931Box 104 \ 4  scan0084
Experiment on drawing N.sch. 3396 and a required modification to the 25 HP S.M. gearbox.31th Dec 1931Box 104 \ 4  scan0085
The successful testing of a 25 HP synchromesh reverse gear.2nd Jan 1932Box 104 \ 4  scan0086
Technical memorandum discussing methods to achieve quieter gearboxes, including the use of single helical sideshafts and different bearing types.4th Jan 1932Box 104 \ 4  scan0087
Design, noise, and potential improvements for a 25HP synchromesh helical gearbox.9th Jan 1932Box 104 \ 4  scan0088
Progress report on the 25 HP Synchro-Mesh gearbox, detailing improvements in noise reduction and plans for standardization.8th Jan 1932Box 104 \ 4  scan0089


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