Structure and Composition
The transmission model of Chang’an CX70 is MR515B03,which has five manual gears.It is fit for the vehlde type whth the front-engine,rear-wheel-drive layout All the forwarding gears are constant mesh type and the reversing gear is sliding idler gear device.The maximum input torque is 145Nm,and with box division type of front and rear box,the gearbox shell has good structural rigidity,compact structure and is easy to process and dismantle.It adopts inertial synchronizer and the gear shift is dependable,steady and flexible.The main technical parameters are shown in Table 5.4.
Table 5.4 Main Parameters of Transmission
Based on the functions and positions,MR515B03 transmission can be divided into seven components:front box body,rear box body,extension box body,input shaft unit,middle shaft unit,main shaft unit,gear shift and position changing unit,as shown in Fig.5.12.The internal part is three-shaft type with input shaft,middle shaft and reversing gear shaft parallel to each other.Power is input from the input shaft,through the middle shaft and output from the main shaft.The MR515B03 transmission realizes the gear shift by axial movement of gear shift and position changing rod,caused by the gear shift and position changing unit bringing its gear shift shaft to move around its center and the gear shift can be gently realized through inertial synchronizer.MR515B03 transmission realizes the transmission and change of power through gear pair and synchronizer.(https://www.daowen.com)
Fig.5.12 Schematic Diagram of MR515B03 Transmission Structure
1—Input Shaft;2—Input Shaft Gear One;3—Reversing Idler Gear Shaft;4—Reversing Idler Gear;5—Input Shaft Reversing Gear;6—Input Shaft Gear Two;7—Input Shaft Gear Four;8—High-speed Synchronizer;9—Input Shaft Gear Three;10—Gear Five Synchronizer;11—Main Shaft Transmission Gear;12—Main Shaft;13—Extension Box;14—Middle Shaft Constant Mesh Gear;15—Rear Box;16—Middle Shaft Gear Three;17—Middle Shaft;18—Middle Shaft Gear Four;19—Middle Shaft Gear Two;20—Low-speed Synchronizer;21—Middle Shaft Gear one;22—Front Box