Double clutch
Encyclopedia
A double clutch is a driving procedure primarily used for vehicles with an unsynchronized manual transmission. The double clutching technique involves the following steps:
such as a typical motorcycle.
Keeping the clutch pedal
pressed while in neutral, as is performed during a typical shift, gives more economy of driver motion and effort compared to double clutching. Taken to extreme, sequential gearbox shifts and non-clutched shifts are also very quick and effortless. However, significant wear can take place on the separated clutch plates any time the engine and transmission have varying drive loads. In simple terms, wear occurs the more the clutch has to "slip" to match revolutions between the engine and transmission. Double clutching can minimize this clutch plate wear by encouraging matching of engine and transmission RPMs before the clutch plates are engaged.
gear system. Due to the difficulty and most often unnecessary redundancy involved in learning the technique, coupled with the advent of synchronized gearing systems, it has largely fallen into disuse. However, drivers of large truck
s often use the double clutching technique when unable to keep the transmission unloaded during shifting, as large vehicles are usually equipped with older, simpler and more durable unsynchronized gearboxes.
The purpose of the double-clutch technique is to aid in matching the rotational speed of the input shaft being driven by the engine
to the rotational speed of the gear you wish to select (directly connected to rotating wheels). When the speeds are matched, the gear will engage smoothly and no clutch is required. If the speeds are not matched, the dog teeth on the collar will "crash" or grate as they attempt to fit into the holes on the desired gear. A modern synchromesh gearbox accomplishes this synchronization more efficiently. However, when the engine speed is significantly different than the transmission speed, the desired gear can often not be engaged even in a fully synchronized gearbox. An example is trying to shift into a gear while travelling outside the gear's speed or directional range, such as accidentally into 1st from near the top of 2nd, or intentionally from reverse to a forward gear whilst still moving at speed.
Double clutching, although time consuming, eases gear selection when an extended delay or variance exists between engine and transmission speeds.
Although double clutching is a testing requirement when obtaining a commercial driver's license
, many experienced truckers have learned when it is possible to shift gears without using the clutch. This is known as float gears or skip shift, which thus eliminates the clutch except for starting and stopping.
Conversely, in order to shift down, engine RPM must be increased while the gearbox is in neutral and the clutch is either engaged or disengaged. This requires the driver to shift into neutral, apply throttle to bring the RPM up to a suitable speed, and finally shift into gear. This operation can be very difficult to master, as it requires the driver to gauge the speed of the vehicle and throttle accurately. Double clutching occurs if the clutch pedal is released while matching engine speeds in neutral and again engaged prior to shifting into the next gear.
, in which the brake and accelerator pedals are pressed simultaneously. Classically, the brake is pressed with the ball of the right foot and the accelerator pedal is controlled by the right heel, while the clutch pedal is pressed by the left foot. However, many variants are possible, with the brake and accelerator pressed by sides of the right foot.
Proper heel-and-toe technique aids both slowing the vehicle while at the same time accelerating the engine for a matched downshift. Note that neglecting to rev-match in any downshifting scenario can be extremely dangerous, especially in low-traction conditions. Heel-and-Toe may be used with any type of gearbox when simultaneous braking and downshifting is necessary. Though difficult, mastering the heel-and-toe technique in conjunction with necessary clutching is essential for high performance driving (e.g., rally racing) to stay in the optimal gear regardless of the simultaneous braking, accelerating, and clutching required for shifts. This allows the engine to stay in the RPM "powerband" and allows one to drive as fast as possible. Left foot braking while accelerating the engine with the right foot to accommodate downshifting in a clutchless situation accomplishes the same feat.
The purpose of the heel-toe-double-clutch is to downshift into the correct gear, and thus optimal engine RPM, for exiting the corner while placing the least wear and tear on the entire drivetrain. Note that racers will sometimes skip gears during downshifts depending on the vehicle speed. With double-clutching there is no need to shift through every gear when significant velocity has been lost.
- The throttleThrottleA throttle is the mechanism by which the flow of a fluid is managed by constriction or obstruction. An engine's power can be increased or decreased by the restriction of inlet gases , but usually decreased. The term throttle has come to refer, informally and incorrectly, to any mechanism by which...
is released, the clutchClutchA clutch is a mechanical device which provides for the transmission of power from one component to another...
pedal is pressed, and the gearbox is shifted into neutral. - The clutch pedal is then released, the driver matches the engine RPM to the gear RPM either by throttle or wait for RPM to decrease until they are at a level suitable for shifting into the next gear.
- At the moment when the revs between engine and gear are closely matched, the driver then instantly depresses the clutch again and shifts into the next gear. The whole maneuver can, with practice, take no more than a fraction of a second, and the result is a very smooth gear change.
Manual transmission shifting
In a gearbox with neutral between each gear, a typical shift actually involves two gear changes, once into neutral, and again into the next gear. During any shift, disconnecting drive components via a clutch properly unloads the engine and transmission of undue pressure applied by the opposing components. Fully utilizing the clutch for each shift out of, and then into each gear is double clutching. Due to the absence of a neutral spacing, double clutching is ill-advised for sequential gear changes, as in a fully sequential gearboxSequential manual transmission
A sequential manual transmission is a type of manual transmission used on motorcycles and high-performance cars for auto racing, where gears are selected in order, and direct access to specific gears is not possible....
such as a typical motorcycle.
Keeping the clutch pedal
Automobile pedal
An automobile may have two to four foot pedals. The arrangement is the same for both right- and left-hand traffic. From left to right:* normally operated by the left foot:**clutch pedal, not in the case of automatic transmission...
pressed while in neutral, as is performed during a typical shift, gives more economy of driver motion and effort compared to double clutching. Taken to extreme, sequential gearbox shifts and non-clutched shifts are also very quick and effortless. However, significant wear can take place on the separated clutch plates any time the engine and transmission have varying drive loads. In simple terms, wear occurs the more the clutch has to "slip" to match revolutions between the engine and transmission. Double clutching can minimize this clutch plate wear by encouraging matching of engine and transmission RPMs before the clutch plates are engaged.
History and theory
Before the introduction of transmission synchronizers (in the 1920s) and helical cut gears, double clutching was a technique required to prevent damage to an automobile'sAutomobile
An automobile, autocar, motor car or car is a wheeled motor vehicle used for transporting passengers, which also carries its own engine or motor...
gear system. Due to the difficulty and most often unnecessary redundancy involved in learning the technique, coupled with the advent of synchronized gearing systems, it has largely fallen into disuse. However, drivers of large truck
Truck
A truck or lorry is a motor vehicle designed to transport cargo. Trucks vary greatly in size, power, and configuration, with the smallest being mechanically similar to an automobile...
s often use the double clutching technique when unable to keep the transmission unloaded during shifting, as large vehicles are usually equipped with older, simpler and more durable unsynchronized gearboxes.
The purpose of the double-clutch technique is to aid in matching the rotational speed of the input shaft being driven by the engine
Engine
An engine or motor is a machine designed to convert energy into useful mechanical motion. Heat engines, including internal combustion engines and external combustion engines burn a fuel to create heat which is then used to create motion...
to the rotational speed of the gear you wish to select (directly connected to rotating wheels). When the speeds are matched, the gear will engage smoothly and no clutch is required. If the speeds are not matched, the dog teeth on the collar will "crash" or grate as they attempt to fit into the holes on the desired gear. A modern synchromesh gearbox accomplishes this synchronization more efficiently. However, when the engine speed is significantly different than the transmission speed, the desired gear can often not be engaged even in a fully synchronized gearbox. An example is trying to shift into a gear while travelling outside the gear's speed or directional range, such as accidentally into 1st from near the top of 2nd, or intentionally from reverse to a forward gear whilst still moving at speed.
Double clutching, although time consuming, eases gear selection when an extended delay or variance exists between engine and transmission speeds.
Although double clutching is a testing requirement when obtaining a commercial driver's license
Commercial driver's license
A Commercial Driver's License is a driver's license required in the United States to operate any type of vehicle which has a gross vehicle weight rating of 26,001 lb or more for commercial use, or transports quantities of hazardous materials that require warning placards under Department of...
, many experienced truckers have learned when it is possible to shift gears without using the clutch. This is known as float gears or skip shift, which thus eliminates the clutch except for starting and stopping.
Conversely, in order to shift down, engine RPM must be increased while the gearbox is in neutral and the clutch is either engaged or disengaged. This requires the driver to shift into neutral, apply throttle to bring the RPM up to a suitable speed, and finally shift into gear. This operation can be very difficult to master, as it requires the driver to gauge the speed of the vehicle and throttle accurately. Double clutching occurs if the clutch pedal is released while matching engine speeds in neutral and again engaged prior to shifting into the next gear.
Heel-and-toe shifting
A related downshifting technique is called heel-and-toeHeel-and-toe
Heel-and-toe is a driving technique used mostly in performance driving, although some drivers use it on the road in everyday conditions in the interest of effectiveness. It involves operating the throttle and brake pedals simultaneously with the right foot, while facilitating normal activation of...
, in which the brake and accelerator pedals are pressed simultaneously. Classically, the brake is pressed with the ball of the right foot and the accelerator pedal is controlled by the right heel, while the clutch pedal is pressed by the left foot. However, many variants are possible, with the brake and accelerator pressed by sides of the right foot.
Proper heel-and-toe technique aids both slowing the vehicle while at the same time accelerating the engine for a matched downshift. Note that neglecting to rev-match in any downshifting scenario can be extremely dangerous, especially in low-traction conditions. Heel-and-Toe may be used with any type of gearbox when simultaneous braking and downshifting is necessary. Though difficult, mastering the heel-and-toe technique in conjunction with necessary clutching is essential for high performance driving (e.g., rally racing) to stay in the optimal gear regardless of the simultaneous braking, accelerating, and clutching required for shifts. This allows the engine to stay in the RPM "powerband" and allows one to drive as fast as possible. Left foot braking while accelerating the engine with the right foot to accommodate downshifting in a clutchless situation accomplishes the same feat.
The purpose of the heel-toe-double-clutch is to downshift into the correct gear, and thus optimal engine RPM, for exiting the corner while placing the least wear and tear on the entire drivetrain. Note that racers will sometimes skip gears during downshifts depending on the vehicle speed. With double-clutching there is no need to shift through every gear when significant velocity has been lost.
External links
- Video of heel-toe braking in conjunction with double-clutch downshifts in a racecar. (.WMV)
- What's All This Double-Clutching Stuff, Anyhow? (another detailed description and reasons for double clutching)