All terrain vehicle 8 to 8 with side turn on a balanced suspension. The author decided to make a mid-engine layout in which torque is transmitted from the front-wheel drive gearbox to the first and fourth axles of the all-terrain vehicle. A bridge is installed there, which is assembled from three gearboxes twisted together by cups. On average, the differential was blocked, and the moment is transmitted to the second and third axis by means of a chain transmission. All-wheel drive torque is transmitted through the drive shaft.
Materials and assemblies used to create this all-terrain vehicle:
1) internal combustion engine from Honda civic 1.3 16v carburetor 75hp
2) from Honda, a five-speed gearbox is also taken
3) three gears from the Mercedes, which are connected to a planetary-friction mechanism
4) drive shaft from Mercedes
5) power steering
6) profile pipe
Consider in more detail the main stages of construction and all-terrain units.
The all-terrain vehicle has the following dimensions: length 340 centimeters, width 210 centimeters and a height of 200 centimeters.
When moving in a straight trajectory, all eight wheels of the all-terrain vehicle are locked, when a turn is made, one of the sides turns off and brakes.
The mass of the all-terrain vehicle is about one and a half tons with a cabin made from the body of a car.
The differential on the middle gear of the all-terrain vehicle was brewed, the left and right rotate the opposite side when the shanks are braked. Torque is not transmitted to the board with the braking shank when turning, while transmission to the other side is unchanged, so there is no load on the engine. In the design, satellites from Mercedes were used.
The hubs were also taken from a Mercedes and attached to the arms of the balancer through standard holes.
For a constantly clamped brake of the shanks, a mechanism was made with constant pressure on the brake cylinder, which is provided by the spring. Using a cable, a steering gear with hydraulic booster pulls and lowers the tail brake. With a small delay, almost simultaneously, the steering gear pulls one of the brake pedals. This provides ease of control of the all-terrain vehicle. The legs are controlled by the clutch and gas of the all-terrain vehicle.
Further, the author mounted the wheels on the all-terrain vehicle frame and engaged in the transmission of the car:
With three gearboxes with the same number of gears, the middle of which is welded, there will be no torque transmission to the wheel when three cardans rotate in the same direction. when the shank is inhibited, one cup rotates in the opposite direction. The gearbox is a planetary mechanism, where the differential case with satellites and one of the gears is the sun and the other is the crown. In this planetary mechanism, both gears are the same.
After assembling the all-terrain vehicle chassis, several hundred meters were overcome to test the design. after the author was convinced of the suitability of such a chassis for the purpose of an all-terrain vehicle, brake discs with calipers on two sides were added. one caliper per shank was also installed, as there was not enough braking force with a complete all-terrain vehicle turn.
At first, a mechanical steering gear was installed, but for convenience it was decided to put a hydraulic booster. Although for the most part the replacement was made due to the strong backlash on the mechanics. disengaging the shank occurs when the steering wheel is turned 20-25 degrees. The steering is very light.
The author was especially worried about the vacuum, since there are four of them two-chamber. But the carburetor helps smooth out their next job, but you had to add a bit of engine revolutions when turning.
Then the author proceeded to create an all-terrain vehicle cabin:
Here you can see the cab frame:
It is worth noting that the rotation mechanism is not made on the differentials, as is customary. In this machine, a planetary rotation scheme was used. In the mechanism consisting of three gears there is not a single differential, that is, there is no moment of distribution along the axes left and right. Thanks to this approach, the same moments always come to the left and right side of the all-terrain vehicle, which increases the all-terrain vehicle's resource. if both shanks are inhibited, then both sides lock. when using a conventional system based on differential rotation, this result cannot be achieved. when driving, there is no direct yaw, the all-terrain vehicle goes clearly.
The essence of the scheme itself is that initially everything is blocked, and when turning, the side that should be stopped is unlocked. the moment transferred to this board passes to the liner. That is, when driving in a straight line, both sides of the all-terrain vehicle are blocked.
After refinement of the basic provisions for the transmission of an all-terrain vehicle, the author began to remove temporary elements, as well as deal with the external details of the all-terrain vehicle. cleaners, power windows, dimensions, and a dashboard were installed, after which all the wiring was put in order.
And in the mechanism that creates a constant braking force on the shanks of final drives. The degree of operation of the spring is regulated by four threaded screws, thanks to which it is possible to adjust the maximum torque going on board. When the side stops completely, the brake disc slides in the calipers on the shank. Thus, the mechanism also works as a safety adjustable coupling.
Video with the off-road vehicle ready:
Photos of the off-road vehicle:
The author of the all-terrain vehicle: Yuri Rzheutsky with the nickname "tandem" on the site of the from Belarus, Zhodino.