There are several kinds of gear shift mechanism in transmission: straight gear, gear, gear sleeve and synchronizer shift. What are their respective characteristics?
(3) the synchronizer shift synchronizer can ensure rapid, no shock, no noise shift, regardless of proficiency and operation technology, so as to improve the car's acceleration, economy and running a series of performance security, the most modern cars use this shift form, compared with the above two kinds of shift the way, although it has complicated structure, high manufacture precision, disadvantages of large axial size, but still widely used. At the same time, the gear shift is smaller than the shift shift of the sliding gear by using a synchronizer or an engagement sleeve. This difference is even more pronounced when the pinion gear is particularly wide. In order to operate conveniently, changing the transmission lever of different gears requires that the stroke be the same as possible.
(2) the gear shift of the gear sleeve is in a state of constant engagement due to the fact that the second shaft gear of the transmission is in constant engagement with the intermediate shaft gear, so the gear can be shifted by a movable engagement sleeve. At this time, because the engaging gear teeth under impact load and gear shifting, and participate in the shift, they are not premature damage, but can not eliminate the impact of the shift, the driving safety and ride comfort still has influence, at the same time, the driver still requires skilled operation technique. In addition, the total inertia moment of the rotating part of the gearbox is increased by adding an engagement sleeve and a constant engagement gear. Therefore, the current shift method is only used in some low gear and heavy-duty transmission. This is because the heavy car stalls between the public is relatively small, angular speed shifting mechanism for connections between the difference is small, so the gear meshing sleeve, and can reduce manufacturing costs and reduce the transmission length.
(1) the gear shift of the straight tooth sliding gear is easy to manufacture and simple in structure. But there are many disadvantages: when the car is running, each gear gear has different angular speed, so the gear shift with the axial sliding straight gear will produce impact on the end of the gear, and accompanied by noise. This makes the gear end wear more severe and premature damage, resulting in lower vehicle safety, while the driver nervous, and the noise generated by the shift will make riding comfort should be greatly reduced. Only when the driver uses a skilled operating technique such as a two foot clutch to make the gears shift without any impact can they overcome the disadvantages. But in the moment, the driver's attention is distracted, which can affect driving safety. As a result, although this shift method is simple in structure, it has rarely been used except for one or reverse gear.
