Your place dating gearbox difficult tell
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The unit knows whether an upshift or downshift is required and what gear the driver is currently in. The right paddle shifts up, the left down. And with electronic control, a clutch is not needed to assist in the process, which can be completed in as little as seven thousandths of a second per change.
Teams can also experiment with the position of the gearbox, and this is something that Mercedes did to good effect around Monaco. The team qualified first and third fastest in Monaco, with Michael Schumacher on provisional pole before his fifth-place grid penalty meted out for his crash with Bruno Senna in Spain.
As it was, Nico Rosberg finished the race second and admitted afterwards that he could easily have been first with a little more luck. Mercedes came into Monaco with a new, lighter gearbox, allowing them to adapt the rear suspension geometry and help combat the rear tire wear that has plagued the team this season.
It seemed to have the desired effect. Alternatively, you could simply have a go at riding your bicycle around your own living room. Search marionfoaleyarn.com Search. Messages You have no messages. Notifications You have no notifications.
Fraser Masefield. In the past, it also manufactured motorcycle hubs, gearboxes and engines. All Sturmey-Archer gear hubs use epicyclic planetary geartrains of varying complexity.
The AW is the simplest, using one set of planetary gears with four planets. The AM uses three compound planets with differently sized cogs machined from a common shaft to engage the gear ring and sun gear separately, while the close-ratio three-speeds, and hubs with four or more speeds, use multiple planetary geartrains.
Depending on the specific hub these may be in series with each other, or with one or the other set being selectable at any given time by locking a particular sun gear to the axle. Inthe K hub was introduced as an ated and improved version of the X, later FX hub following the introduction of fine axle threading - it is the Model X which was manufactured under license by BSA as their 3 speed hub until Most notable was the 6-prong ramped sliding clutch which was mounted between springs, this gave the advantage of lateral movement being possible without shifter movement and allowed gears to be pre-selected while pedalling, the ratio would change when pedal force was relaxed, freeing the mechanism to slide into the new gear and under spring pressure.
The ramped clutch dogs and sprung mount also permitted the K hub to be without a neutral position between the 'Normal' direct drive gear, and the 'High' overdrive gear, both the SW and AW until the mid s have this neutral position.
The gear ring dogs would ratchet around the clutch using the ramps and springs if the hub was trying to engage Normal and High gear at the same time, though allowing this to happen through slow shifting can cause excessive clutch wear and render the hub inoperable. In Low gear, this isn't a problem as the low gear pawls can be overrun by a higher gear, while Normal and High gears use the same pawls, requiring an alternative solution.
The K hub spawned a Tricoaster version with back pedal brake, designated KC, in and both close ratio KSand medium ratio KSW variants in and respectively. The KB was joined in by the KT mm tandem drum brake, part of a family of mm drum brakes alongside the BFT and BRT front and rear drum brakes BR type drum brakes are not gear hubs and are instead threaded for fixed sprockets or freewheels.
Despite the primary selling point of Sturmey-Archer hubs being their offer of three gears when rivals managed only two, Sturmey-Archer produced a range of two speed hubs in the s. This began with the T and TF identical hubs, F denoting a fixed sprocket inalongside a version with a 90mm drum brake; with a rod brake operation and freewheel, this was TB, with a rod operation and fixed wheelthis was TBF, while a C was added to either designation to denote cable operated brakes instead of rods.
In reality, an end user can easily switch between fixed and free, and rod and cable by swapping out common parts, though the hub shell will continue to show the designation for a given hub's original configuration. Ina close ratio 2 speed was introduced, this was called TC and offered a Hubs manufactured in the s have a date stamp given as a number at the end of the model designation, this can be seen on examples of all of the hubs mentioned in this section, as well as some A and F family hubs.
Sturmey-Archer's most widely known product is the AW wide-ratio three-speed hub gear, introduced in though patented in and still in production in a substantially modified form as of In a four-speed close ratio model AF was released, intended as a close ratio 3 speed with an additional low gear for hills, this was discontinued in and succeeded by the near identical FC hub in The FW led to the development of a series of internally similar 'S5' five-speed models, and bySturmey-Archer were producing seven-speed hubs.
Production was low, and in the mids these were discontinued, hub geared bicycles having gone mostly out of fashion. The brief story of the Sturmey-Archer SW series medium-flange wide-ratio three-speed hub provides strong substantiation of the merits of the AW design.
I have an AJS/Matchles gearbox No GB25j54 A I have not been involved with bikes for some time and I would like to sell this marionfoaleyarn.com was rebuilt to be used but I never used it so it is time to pass it onto someone that needs it as it has been hanging in the shed. Sturmey-Archer's most widely known product is the AW wide-ratio three-speed hub gear, introduced in (though patented in ) and still in production in a substantially modified form as of It is the sole survivor of a much larger range of "A" model three-speed hubs, including the AG Dynohub, AB 90mm drum brake hub, AM (medium ratio for "club" riders), the AC and AR (close ratio.
Sturmey-Archer Gears Ltd. Riders appreciate the nearly silent operation of its springless 'centrifugal' pawls while the pawls are often described as being centrifugal in operation, they in fact operate by a rocking motion as the freewheel ratchet teeth pass over them, pushing them back and forth in their slightly oversized sockets.
Smaller and lighter than an AW hub, the SW was aptly, but unfortunately, described by Sturmey-Archer as having "fewer working parts than any other wide-ratio 3-Speed hub"  and was thought to be less costly to manufacture than the AW series that had been in production since The new hub turned out to be slow to engage drive because the mode of pawl engagement necessitated fewer freewheel stops and could not be "pre-shifted" like an AW can while changing 'up', and the AW's predecessor, the 'K', can while changing in either direction.
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This pre-selection of gears was never advocated by Sturmey-Archer. More troubling, the unique crescent-shaped pawls can have slippage issues, even with correct toggle chain adjustment, as engagement of only two of the three pawls in each freewheel is insufficiently stable to hold normal levels of torque.
This is more pronounced in hubs which are sticky inside from incorrect lubrication, and ones which have been allowed to wear through poor maintenance or, less commonly, heavy use. Both the SB and SG would have used a modified set of SW internals with a shortened planet cage to facilitate the additional functionality on the left side of the hub.
The AW had been built under license by The Hercules Cycle and Motor Company as the A type in the s and the B type in the s there is no functional difference and the letter merely denotes the decade. After the failure of the SW in the market and the re-commitment to the AW, Sturmey-Archer continued to widely license the design, with fully interchangeable clones of the AW eventually being made under labels including J.
The S2 - Sturmey-Archer's first 2-speed hub since the demise of the T series in and the last two speed they would make in the UK - featured a direct drive and a While its lack of need for a gear cable might have led to the S2 being a popular choice for small wheeled and folding bicycles, the nature of the gears meant that a small wheeled bicycle would struggle to obtain acceptably high gearing within the constraints of a the size of its wheels, b the minimum size of sprocket which could be fitted and, c the maximum size of chainwheel which could be obtained.
For these reasons, it was commercially unsuccessful. The up-shift and down-shift process is the same, with the hub toggling between gears; there is a consequent risk of overshooting the desired gear.
The S2 has no equivalent to the sliding clutch seen in 3- and 4-speed Sturmey-Archer hub designs, there is indeed no lateral movement within the hub in use. To achieve this radically different mode of shifting gears, the hub featured a unique driver with a 4 spline keyed socket in the middle similar to, though not interchangeable with, later 'No Intermediate Gear' AW driversinto which sat a selector sleeve.
The 4 cuttings on the selector sleeve 2 shallow and 2 deep, arranged alternately enabled the selector sleeve to transmit drive from the driver to the backs of the two unique high gear pawls, with said pawls either allowed to engage the hub shell for direct drive deep selector sleeve cutting or tripped out such that drive is transmitted only to the gear ring shallow selector sleeve cutting. Low gear then operates in the same way as on an AW hub, with the drive of the ring gear turning the planet cage via the planet gears - and hence the shell - at a reduced speed.
The S2 hub features three low gear pawls mounted in its shortened planet cage, necessitating a low gear freewheel track with twelve stops instead of the 10 which would be found on a contemporary AW, this means that an S2 freewheeling in low gear will tick more frequently and more loudly than an AW in low gear at the same speed in a wheel of the same size.
Because of this difference in the left low gear freewheel, and the short planet cage, the S2 has a gear ring pressed into the shell near the middle, with the mechanism occupying little more than half of the shell volume and the rest being left empty.
Now all is clear, I thank for the help in this question.28.01.2020|Reply