This transmission has been used in motor vehicles in the 1930's. Here is not going to learn the history of the transmission, but this model easier to understand the working principle of a transmission, in particular how the process of removal / transfer of power / moment carried in a motor vehicle transmission. A simple schematic model of this transmission, can be seen in the picture below. This transmission uses gears spur gear type and is made with three separate shafts, namely:
(1) the primary shaft (4) (primary shaft) - the shaft that receives the first rotary motion of the clutch.
(2) intermediate shaft (2) (layshaft / countershaft) - that is where the counter gears are placed.
(3) the main shaft (9) (mainshaft) - the shaft out of the transmission, transfer power to other system components.
In the neutral position, all the gears on the main shaft is positioned not associated with the existing gear on intermediate shaft. Rotation of the primary shaft forwarded to the gears on the intermediate shaft, but do not rotate the gear on the main shaft. In other words, rotation of the primary shaft is not transferred to the main shaft / output transmission.
Tooth position First, the gears on the main shaft A is shifted up a gear connected to the intermediate shaft B to see the image in Figure 5 or 6 parts number 11. C while the gears in neutral. In this position, means the rotation of the gear shaft E in the primary, F transferred to the gear wheel mounted gear off with B or F gear wheel gear B. Rotation of the gear to gear B is moved and passed keporos A main transmission output. Because the player gear (driver) the number of teeth less (ie gears E and B) of the playing gear (driven), then there is a decrease or reduction of spin-rise
Calculation of spin reduction is done by comparing the number of teeth on gears that rotated compared to the number of gear teeth on the player.So the formula comparison teeth as follows:Comparison Dental First = F / E x A / B = 40/20 x 40/20 = 4.Figure 4 shows that the moment the transmission output would be 4 times greater than the moment at the input shaft, but the speed / transmission output shaft rotation putraran ¼ of the input shaft. This means that the same engine rpm, vehicle speed is slower. It is necessary to lift the burden of a larger vehicle with a fixed power.Both the position of teeth, the second speed gear A on the release of the gear B, and C are connected keroda gear teeth D. So that the flow of energy / rotation of the gear to gear E F, F spin gear with gear D, then D rotating gears gears C and forwarded to the transmission output shaft.Calculation of spin reduction equal to the first gear position above, namely:Comparison of Dental Both = F / A x C / D = 40/20 x 30/30 = 2.Figure 2 shows that the moment the transmission output would be 2 times larger than the moment at the input shaft, but the speed / transmission output shaft rotation putraran ½ of the input shaft. This means that the same engine rpm, vehicle speed two times faster in comparing the first gear position.Third tooth or the highest position, the position is a permanent free gear, gear C is removed from D and shifted gears are connected directly through a dog clutch with gear E. thus the input shaft rotation with output shaft rotation or 1: 1.Position Reverse / Reverse, is required to drive the vehicle backward. In this position C shifted gears in neutral and shifted gears A gear associated with H, spin gear to gear E F G next gear that rotates together with the gears rotate gears F H, and H gears A gear wheel and the transmission output keporos forwarded by the reverse rotation of the input shaft. When the number of G is 10 teeth, thenComparison of Dental Both = F / E x H / G x A / H = F / E x A / G = 40/20 x 40/10 = 8.Figure 8 shows that the moment the transmission output will be 8 times larger than the moment at the input shaft, but the speed / rotation transmission output shaft 1/8 of putraran input shaft. This means that the same engine rpm, vehicle speed of 1/8 more slowly.
b) Unit Selector MechanismAs mentioned in the description above, the existing transmission equipment which is used to operate the transmission onalkan, ie to change from one speed to another kekecepatan. Gears in the transfer should not be double splicing, such as gears A gear associated with H or B, then C is also associated gear to gear E or D. When this happens, the consequences could be fatal, if not locked or can not spin all, mak damage can occur on one pair of gears.To prevent these problems, the manual transmission is equipped with a device selector mechanism, as shown in the image below.
Fork selector (selector fork) on a drawing, used to shift the gears on the main shaft. In the three-speed transmission plus one reverse speed selector fork requires two pieces. The bottom of the fork selectors associated with the gears, while the upper part associated with a movable handle the transmission of the wheelhouse.
Each transmission must be equipped with pealatan (a) to put the gear selector to avoid air-geraksendiri, and (b) to prevent the two gears are connected simultaneously. So b serves to hold the position of the gears. In this position, if one gear is moved, then it is locked by a mechanism other sectors, such as was seen in the picture c. Pennguncian through design that is placed between the plunger rod selector. Thus if one of the gears will be connected, then the other is locked in a neutral position. A gear when the gear is connected then C is locked in a neutral position. So that the selector mechanism likely be attached two gears simultaneously can be prevented.
c) Transmission 4-speed synchromesh
The concept of energy flow / moments similar to those used in the above three-speed transmission. The difference in transmission does not use the system except for the reverse sliding gear. This condition allows the used to be a form other than spur gears, both forms of the double helical or helical. These teeth form in addition to the more powerful because more extensive contact between his teeth, his voice is also more refined.
Construction of this transmission, all the gears on the main shaft (main shaft) connected free. While the main shaft connected sychromesh sliding.
