CHASSIS — RA61F MANUAL TRANSMISSION CH-5 RA61F MANUAL TRANSMISSION JDESCRIPTION The RA61F manual transmission is a 6-speed manual transmission. This manual transmission has the following features: Item Feature Gear Train An output reduction method is used to achieve a compact construction. All forward gears and reverse gear are constant mesh type gears. They are used to Gear Engagement achieve an excellent shift feel. A triple-cone type synchromesh mechanism is used for 1st, 2nd and 3rd gears to Synchromesh Mechanism achieve an excellent shift feel. Shift Mechanism The shift mechanism uses four shift forks and sliding-shafts. • The transmission front, center and rear cases and control shift lever retainer are Transmission Case and made of aluminum alloy for weight reduction. Cover • A transmission cover is used to restrain the transfer of the internal sound of the transmission to the cabin. Oil Separator An oil separator is used to reduce parasitic losses due to transmission oil churning. Input Shaft 3rd Gear Reverse Gear 2nd Gear 5th Gear 1st Gear Output Shaft Shift Pattern 4th Gear 6th Gear Counter Shaft 276PD06 276PD35 CH-6 CHASSIS — RA61F MANUAL TRANSMISSION " Specification A Type RA61F 1st 4.171 2nd 2.190 3rd 1.488 Gear Ratio 4th 1.193 5th 1.000 6th 0.799 Reverse 3.607 Oil Capacity Liters (US qts, Imp.qts) 1.8 (1.9, 1.6) Oil Viscosity SAE 75W-90 Oil Grade API GL-4 or GL-5 Weight (Reference)* kg (lb) 57.7 (127.2) *: The figure shown is the weight of the part including the oil. CHASSIS — RA61F MANUAL TRANSMISSION CH-7 JGEAR TRAIN The gear train uses the output reduction method, that is, the output shaft is equipped with a reduction gear. When compared with the input reduction method, the output reduction method has the following features: D In a transmission that uses the input reduction method, input torque from the engine is increased by the reduction gears before the input torque acts on each drive and driven gear. In this case, the width of the teeth on each gear needs to be large. On the other hand, in a transmission that uses the output reduction method, input torque from the engine is increased by the reduction gears after the input torque acts on each drive and driven gear. This reduces the width of the teeth needed on each gear, allowing a smaller and lighter gear train to be produced. D In the configuration of a gear train that uses the input reduction method, the drive and driven gears are located behind the reduction gear. Because of this, the moment of inertia of the input shaft and counter shaft acts on these two gears. In contrast, in the configuration of a gear train that uses the output reduction method, the drive and driven gears are located in front of the reduction gear. This causes the moment of inertia of the input shaft only to act on the gears, reducing shifting effort. 6th Input Shaft 4th : Torque transmission 3rd route in 3rd gear Clutch Output Shaft Engine Synchronizer Ring Reduction Gear 2nd 1st Counter Shaft 0240CH02C Output Reduction Method Synchronizer Ring 1st 2nd Input Shaft 4th : Torque transmission 3rd route in 3rd gear Clutch 6th Output Shaft Engine Reduction Gear Counter Shaft 0240CH03C Input Reduction Method CH-8 CHASSIS — RA61F MANUAL TRANSMISSION JSYNCHROMESH MECHANISM The synchromesh mechanism for each gear is as follows: Gear 1st, 2nd, and 3rd 4th, 5th and 6th Reverse Synchromesh Triple-cone Single-cone Lever Mechanism Type JSHIFT MECHANISM The shift mechanism has four shift forks, four shift fork shafts, four shift detent balls, and four compression springs. D The four shift detent balls and four compression springs are used for the shift detent mechanism. The shift detent mechanism is provided to prevent engaging two gears at one time, and to prevent accidental shifting into reverse gear. No.3 Shift Fork Shaft No.1 Shift Fork Shaft No.2 Shift Fork Shaft Shift Detent Ball Compression Spring No.4 Shift Fork No.1 Shift Fork No.3 Shift Fork No.4 Shift Fork Shaft No.2 Shift Fork 0240CH04C D To prevent unintended operation, a buzzer in the combination meter sounds once after the transmission has been shifted to reverse in order to alert the driver of the shift lever position. Combination Meter Back-up Light Switch Buzzer 0240CH66C CHASSIS — RA61F MANUAL TRANSMISSION CH-9 JTRANSMISSION CASE AND COVER D The transmission front, center and rear cases and control shift lever retainer are made of aluminum alloy for weight savings. These cases realize the high strength and durability due to their cylindrical shape and optimal arrangement of strengthening ribs. D A transmission cover is use to reduce the transfer of transmission noise to the cabin. Transmission Cover Control Shift Lever Retainer Transmission Front Case Transmission Rear Case Transmission Center Case 0240CH05C CH-10 CHASSIS — RA61F MANUAL TRANSMISSION JOIL SEPARATOR An oil separator made of aluminum alloy is provided at the bottom of the transmission rear case. This construction prevents the oil in the sump from being directly mixed by the counter shaft. Combined with the transmission center case, which is constructed to act as a tank, energy losses due to oil mixing have been reduced. Oil Separator Center Case Side Rear Case Side Tank Construction 275TU81 Oil Separator.