1、Toyota Prado four-wheel drive systemToyota Prado (PRADO) Toyota Land Cruiser familys latest SUV. The new development of the next-generation SUV, equipped with Toyotas new 4.0LV6 engine emissions meet Euro standard. Prado (PRADO) advanced engine provides strong power output, together with the sturdy
2、frame and enhanced suspension system so bumpy road to become comfortable and smooth. As a sport utility vehicle, four-wheel drive system can be described as a top priority. This article will introduce you to focus Prado (PRADO) equipped with full-time four-wheel drive systemFor ordinary bevel gear d
3、ifferentials, whether inter-wheel differential or intermediate differential, because the planetary gear speed difference in the absorption due to internal friction generated by the rotation is very small, if not to limit it or lock only, if one side (or a shaft) wheel slip, the other wheels (or axle
4、s) is also the driving force is limited to the side of the wheel slip (or axis) of the driving force is equal to the tire can not be fully grip, affect the cars off-road. Prado (PRADO) chassis system uses a full-time drive mode, the layout of the three differentials: front, rear differential bevel g
5、ear differentials using ordinary, non-differential limiting and locking device, left and right both sides of the wheel slip through the TRC / VSC braking system to limit; intermediate differential use childcare Sen (TORSEN) T-3-type limited-slip differential. Domestic FAW Toyota Prado (PRADO) using
6、4BM actuator, can be achieved electronically controlled differential lock.Full-time four-wheel drive system, the basic structureToyota Prado(PRADO)four-wheel drive system consists of the mechanical part of the transmission, actuator (available electronically controlled locking differential), front a
7、nd rear drive shaft and front and rear differential sand other components.Theel ectronically controlled four-wheel drive in part by the brake control ECU, the engine ECU, inter mediate differential locking button, parking and neutral position switch, 4WD control ECU and splitter electric actuator sa
8、nd other components .Splitter electric actuator so perate according to the drivers wishes(center differential lock button), brake status, state of the engine operating speed, transmission gear status signal splitter for the differential lock stop control. The purpose of doing so is to facilitate the
9、 drivers operation, to ensure the transmission of switching actuator accurately and efficiently, avoid mechanical damage caused by misuse.Splitter electric actuatorsFAW Toyota Prado (PRADO) engine model 1GR-FE, transmission model A750F, its sub-actuators using improved VF4BM. Shown in Figure 2, actu
10、ator has two gear L and H, the transmission ratios of 2.566 and 1.000, L, H gear manually by the driver. According to road conditions and the driver to switch the intermediate differential locking button to carry on the differential lock, thus enabling H4F-H4L-L4F-L4L shift mode. H4F and L4F splitte
11、r for the corresponding high and low gear differentials F (free) mode, H4L and L4L was L (lock) mode. Other types of sub-actuator shown in Table 1, wherein VF2A splitter 2700 models used in the Prado, TORSENLSD the optional component.Coming from the power transmission through the splitter and a subt
12、ransmission L or H gear spread differential gear casing, and then by the differential transmission mechanism within the power to the front, rear axle, 4WD control ECU for the splitter electric actuator control, drive middle differential lock fork shaft to achieve the intermediate differential lock s
13、witch.TORSENLSD slip differential structureTORSENLSD structure mainly by the differential housing, the planetary gear carrier, the planetary gear, a sun gear, a ring gear engaging gear, the sun gear wheel engaging the clutch disc, and four other components. The structure has eight planets and the su
14、n gear and the ring gear external teeth meshing with each other, their mutual tooth meshing gears are TORSENT-3 type. When the ring gear and the sun gear of the speed ranges when (a drive shaft with slip tendency), will be forced to produce planetary rotation movement, this movement will lead to rot
15、ation with the ring gear or the sun gear relative axial movement. Axial movement of the pressure within the device installed in the clutch pressure plate, resulting in internal friction, thus limiting the relative movement, also limits the movement of the drive shaft to slip, and increase the torque
16、 of the drive shaft does not slip; sun wheel engaging with the sun gear wheel pair with each other, so that the sun wheel to the front coming from the PTO shaft. And put the ring gear engaging the ring gear teeth to the rear PTO shaft, thus engaging the teeth actually used for transmission of power transmission gear. As long as the front and rear wheels due to the adhesion surface due to changes in the torque changes, the differential will immediately produce
