All-wheel drive truck

FIELD: transport.

SUBSTANCE: invention relates to vehicles with all-wheel drive. All-wheel drive truck includes cabin, cargo body, transmission to transfer torque moment from engine to front and rear driving axles. In the kinematic chain of transmission, there is transfer gear with interaxle differential. Interaxle differential comprises two planetary gear sets. The planetary gear sets are switched by gear clutch. The gear clutch is driven by piston. The piston is located in two-section chamber communicating with working fluid pressure source via four-way on/off control valve. The control valve is operated by electric magnet. The electric magnet is connected to step switch. The step switch is driven from rear driving axle beam.

EFFECT: better drivability and flotation of vehicle.

3 cl, 2 dwg

 

The technical solution relates to wheeled vehicles. It applies to trucks with all-wheel drive capable of moving in all road conditions.

Transmission all-wheel drive trucks used transfer case with a center differential, which may contain one or more planetary gear sets, shown, for example, in patents No. 2026208, 2093374, 2192972 issued in the Russian Federation. As a close analogue adopted four-wheel drive truck, shown in issued U.S. patent No. 4280583, NCI 180/250, IPC B60K 17/34 containing the cab, a frame for mounting on her body behind the cab, the transmission for the transmission of rotary torque from the engine to the front and rear driving axles. In the kinematic chain of transmission is the transfer case with a center differential that contains the planetary series, distributing in certain proportions turning points transmitted to the driven axles. However, in this car is the ratio of the turning points, coming to the front and rear driving axles, remains unchanged during movement of the vehicle with cargo in the back, and during its movement without load, which affects the car's handling, increase tire wear its wheels.

Problem to be solved is to improve the manageability fully ipodnova truck during its operation under various conditions, reducing tyre wear his wheels by automatically balancing on its wheels when the stowage of cargo in the vehicle and during unloading.

The solution provided by the fact that in four wheel drive truck that contains the cab, body for carriage mounted on the frame, a transmission for transmitting rotary torque from the engine to the front and rear driving axles, with elastic suspension on the frame, a transfer case with a center differential, which is located in the kinematic chain of transmission, center differential includes two planetary range, switchable gear coupling having a drive piston located in a two-chamber communicated with a source of pressure fluid through a four way two-position valve having a control electromagnet connected electrical circuit to the stepping switch having the drive from the rear beam axle.

Due to the use in the transmission-wheel drive truck transfer case with a center differential that contains two planetary range, switchable gear coupling with the stowage of cargo in body during removal of the cargo body to signal to the drive coupling from the electrical switch, responsive to the change in distance is a distance between the frame and axle when handling, improved handling due to the rational distribution of load on the wheels when empty and when loaded the body, reduces tyre wear and easier maintenance of the vehicle as the load on the wheels is done automatically, without requiring the intervention of the driver.

The drive of the specified switch includes a lever connected with earrings with the beam axle and secured to a shaft mounted in the bracket on the frame and connected through a planetary transmission with a movable electric contact switch, located on the swivel leash in a sealed case and a stationary electrical contact is made in the form of an annular sector, is connected to the said electromagnet.

To the electric circuit connecting the solenoid control valve with on / off switch, a capacitor connected between the capacitor and the switch in series with the electromagnet is a diode in parallel to the diode is an induction coil.

The figure 1 shows a four-wheel drive truck.

The figure 2 shows the transfer case of the vehicle.

Four-wheel drive truck, presented in figure 1, includes a frame 1 on which the front cabin is 2, and it has a body 3, a dedicated lane for the transport of cargo. Between the cab and the body is installed on the frame of the engine 4. The vehicle includes a transmission for transmitting rotary torque from the engine to the front leading to the bridge 5 and the rear to the leading axle 6 with the elastic suspension on the frame 1. In the kinematic chain transmissions are gear 7, gear box 8, equipped with a center differential and drive shafts 9 for the connection of shafts of the transfer case with the shafts of the gearbox and axles.

The transfer case includes a housing 10 (figure 2), which houses the driving shaft 11 and driven shaft 12, connected gear. With the driven shaft 12 is connected drove 13 center differential with two switchable planetary series. On the driver 13 are identical satellites 14 and 15, which have toothed engagement with each other, with the crown gear 16 and sun gear 17 and 18. The sun gear 17 of the first planetary series has a splined connection with the output shaft 19 of the drive front drive axle 5. The sun gear 18 of the second planetary series is installed on the output shaft 20 of the rear driving axle 6 with the possibility of free rotation on his smooth neck. To change the kinematic relations in inter-axle differential gear box includes a gear coupling 21 having a splined with the unity with the output shaft 20. The gear coupling 21 is made with the outer and inner toothed crowns for alternate communication with the output shaft 20 or the sun gear 18, with the outer ring gear or crown gear 16 having an internal ring gear. The gear coupling 21 is driven by a piston 22, to which it is connected by a leash through the bearing. The piston 22 is located in the housing 10 of the transfer case in two working chamber 23 is communicated through the hydroline 24 and 25 with a source of pressure fluid, in particular a pump 26 through a four way two-position hydraulic valve 27. The valve 27 has a control electromagnet 28 connected electrical circuit 29 to the stepper electric switch 30 located in the sealed pouch to the vehicle frame. The switch 30 includes a movable electrical contact located on an elastic swivel leash 31, United electrical circuit with a source of electric current, in particular a rechargeable battery, and a stationary electrical contact 32, made in the form of an annular sector in which the electrical circuit 29 is connected to the electromagnet 28. To the electrical circuit 29, which connects the solenoid 28 of the control valve with on / off switch 30 connected to the capacitor 33. Between the capacitor 33 and in which the back panel 30 in series with the electromagnet 28 is a diode 34. In parallel to the diode 34 is an induction coil 35, provides a gradual discharge of the capacitor in the case of short-term saskachewan movable contact, i.e. the turning of the lead 31 from the fixed contact of the switch. Turning the lead 31 of the switch 30 has a mechanical drive from the beams 36 of the rear driving axle 6 of the vehicle. This drive contains the lever 37, the associated articulated through earrings 38 with the beam 36 of the drive axle. The lever 37 mounted on a shaft which through the planetary transmission is connected to the swivel leash 31.

When driving the rotary torque from the engine through the gearbox is supplied to the driving shaft 11 of the transfer case 8, and from him through the transmission gear is transmitted to the follower shaft 12 and next to the cage 13 center differential. When empty the body of working fluid from the pump 26 through the valve 27 is supplied to the rear section of the working chamber 23, by setting the piston 22 and an associated gear clutch 21 in the position in which the toothed clutch connects the sun gear 18 with the shaft 20 of the rear driving axle 6. Then the turning point comes from the led 13 to the output shafts 19 and 20 of the drive axles through both satellites 14 and 15 and through both of the sun gears 17 and 18. In this case, the turning point is distributed equally between the bridges.

When laying in buzovgrad spring suspension axles under his weight SAG, and the frame 1 is lowered closer to the beam 36 of the drive axle. When releasing the frame rotates the lever 37, which through the planetary gear rotates the lead 31 of the electrical switch 30. Making step, the lead 31 enters a movable contact into contact with a fixed contact 32. Touch the contacts of the electric current from the battery is supplied to the electromagnet 28, which moves the slide valve of the distributor 27 to another position in which the front section of the working chamber 23 communicates with the pump 26 and its rear section, located behind the piston 22, is communicated with the drain. Under the action of pressure in the front section of the working chamber, the piston 22 takes the gear coupling 21 on the sun gear 18, severing it with the shaft 20, and connects this shaft 20 of the crown gear 16. Then the torque from the carrier 13 is transmitted to the output shaft 19 of the front axle drive is still via the satellite 14 and the sun gear 17 and the output shaft 20 of the rear drive axle turning moment is transmitted via the satellite 14 and through the crown gear 16. After this torque on the shaft 20 of the rear driving axle 6, on which is loaded the body, is significantly greater than on the shaft 19 of the drive front drive axle 5. After transportation and unloading of cargo and the body frame 1 is lifted and the lever 37 is rotated in the opposite direction, taking the lead 31 with the movable contact out of contact with stationary contact 32. Then stops the flow of electric current to the electromagnet 28, the control valve 27, and then the spring-loaded spool valve 27 is returned to its original first position in which the front section of the working chamber 23 is communicated with the drain, and the rear section, located behind the piston 22, it is reported through hydroline 25 by pump 26. Under the action of pressure fluid in the rear section of the working chamber 23 of the piston 22 moves to the sun gear 18 and connects it to the gear coupling 21 with the output shaft 20 of the rear drive axle. Then when moving the empty car to the place of loading in its body cargo turning point is distributed equally between the driving axles, the wheels which in this case, when the empty body load is approximately the same.

Due to the availability of transmission four-wheel truck transfer case with a center differential that contains two planetary series, switched automatically when loading cargo into the truck and unloading, ensuring timely distribution of the load on the wheel axles, simplifies the maintenance of the car improves its maneuverability at movement p. the soft soil and manageability when driving at high speed on paved roads, reduced tyre wear.

1. Four-wheel drive truck that contains the cab, body for carriage mounted on the frame, a transmission for transmitting rotary torque from the engine to the front and rear driving axles, with elastic suspension on the frame, the kinematic chain of transmission is the transfer case with a center differential, center differential includes two planetary range, switchable gear coupling having a drive piston located in a two-chamber communicated with a source of pressure fluid through a four way two-position valve having a control electromagnet connected electrical circuit to the stepping switch having a drive beam rear axle.

2. Four-wheel drive truck according to claim 1, characterized in that the actuator of the switch includes a lever connected with earrings with the beam axle and secured to a shaft mounted in the bracket on the frame and connected through a planetary transmission with a movable electric contact switch, located on the swivel leash in a sealed case and a stationary electrical contact is made in the form of an annular sector, is connected to the said electromagnet.

3. Four-wheel drive truck auto is according to claim 2, wherein the electrical circuit connecting the solenoid control valve with on / off switch, a capacitor connected between the capacitor and the switch in series with the electromagnet is a diode in parallel to the diode is an induction coil.



 

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