Toyota Land Cruiser 70 2017 Series Builder's Manual page 17

(1) How to determine the distance from wheel center to frame reference line
The distance from the wheel center to the frame reference line should be determined by calculating the
single-wheel sprung loads and then either by reading from the spring characteristic curve or calculating
according to the following equations.
WF - W
1
Wf =
2
WR - W
2
Wr =
2
Wf
HF = H
0
K
Wr
HR = H
0
K
(2) Example of calculation
Let us calculate the frame reference line height from ground, Y, at the rear wheel center after rebuilding using
the model HZJ79L-TJMRS3 as an example. Suppose the rear axle weight after rebuilding as 13000N.
① Obtain the single wheel sprung load for rear wheel, Wr, using the following equation.
ex.
WR - W2 13000 - 2453
Wr= =
2
【 2 】 -3. Suspension
Wf Single-wheel sprung load (front wheel) (N)
Wr Single-wheel sprung load (rear wheel) (N)
WF Front axle load (N)
WR Rear axle load (N)
W Unsprung load (front axle) (N)
1
W Unsprung load (rear axle) (N)
2
Distance from wheel center to frame reference line with 0-N
H
0
single-wheel sprung load (mm)
K Spring constant (N/mm)
=5273.5N
2
13
1786×70×7-1
1696×70×7-1
1390×70×8-1
1270×70×8-1
1130×70×8-1
1010×70×8-1
830×70×15-1
550×70×15-1