Land vehicles – Wheeled – Running gear
Patent
1988-05-02
1989-06-27
Rice, Kenneth R.
Land vehicles
Wheeled
Running gear
180 2402, 280718, 280686, B60C 504
Patent
active
048423025
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a lifting bogie for a commercial vehicle, comprising
on both sides of the vehicle a rocker arm journalled on a rocker arm shaft and supported at one end thereof on a bogie spring by means of a spring pendant, and an auxiliary shaft journalled on the rocker arm acentrically with respect to the rocker arm shaft for a bogie wheel, and
at least one double-acting hydraulic cylinder for pivoting the rocker arms by means of at least one transmission lever for lifting and lowering the bogie.
Lifting bogie structures of the above type are used very generally in commercial vehicles for improving the ease of movement and the load-carrying capacity of the vehicle, particularly in lorries intended for use also in bad road conditions. As described above, the most usual way of using a lifting bogie is to press the transmission lever by means of the hydraulic cylinder against the rocker arm adjacent to the end thereof close to the spring pendant so that the auxiliary shaft journalled at one end of the rocker arm for the wheel is caused to move upwards. These hydraulic cylinders are often double-acting, so that the transmission lever mounted stationarily therein can be lifted by means of the lifting cylinder so that it does not hinder the movements of the rocker arm. Thus the movement balancing the axle weights of the rocker arm is allowed to take place freely.
The object of the present invention is to provide a lifting bogie structure which enables a more versatile use of a double-acting lifting cylinder, so that the maintenance of the vehicle, e.g. the changing of the tyres, is easier as well as the handling of the vehicle, e.g. when the driving wheels of the vehicle have dug into ground so that the vehicle is stuck.
The above object is achieved by means of a lifting bogie according to the invention, which is characterized in that it comprises means for interconnecting the transmission lever(s) and the rocker arms in order to enable the hydraulic cylinder to exert an upwardly lifting force on the driving shaft by the action of the transmission lever, the spring pendant and the bogie spring. The transmission lever and the rocker arm are preferably interconnected at a point in which the transmission lever is supported on the rocker arm when the bogie is being lifted. It is thereby possible to utilize the traction enabled by the double-acting lifting cylinder for pivoting the rocker arm around the shaft thereof so that the bogie wheel mounted on the auxiliary shaft is pressed against the ground and the bogie spring is lifted upwards by means of the spring pendant with the result that the driving shaft suspended from the bogie spring and the wheels thereof can be lifted off the ground. Thus the wheels of the driving shaft can be changed without any external lifting aid. The vehicle can also be moved even though the driving shaft would be locked or wholly detached. The driving wheels can similarly be lifted up when they have dug into ground so that the vehicle is stuck, whereby the vehicle can again be put into motion by lifting up the driving wheels and reinforcing the ground beneath.
There is preferably one transmission lever provided for each rocker arm, and these levers are triangular and journalled on the rocker arms. whereby it is further to be preferred that the means for interconnecting the transmission lever with the rocker arm comprise a pair of lugs attached to the rocker arm and provided with holes; a hole formed in the transmission lever; and a cotter pin which is arranged to be passed through the lugs of the rocker arm and the holes of the transmission lever. An extremely reliable connection between the transmission lever and the rocker arm can thus be provided by extremely simple means.
In the following the lifting bogie according to the invention and the operation thereof will be described in more detail with reference to the attached drawing, wherein
FIG. 1 illustrates a lifting bogie according to the invention when the bogie is in the lowered position,
FIG. 2 illustrates the lifting
REFERENCES:
patent: 2777529 (1957-01-01), Harbers
patent: 3659671 (1972-05-01), Heinze
Kyrola Pentti
Lauronen Joel
OY Sisu-Auto AB
Rice Kenneth R.
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