DE3501142A1 - DEVICE FOR LIFTING THE ADDITIONAL SUPPORT AXLE OF TRUCKS - Google Patents

Description

^Γ _, _ 3501Η?

The invention relates to a device for lifting the additional Support axle of trucks according to the preamble of claim 1.

Usually the additional support axles are in front of or behind arranged on the drive axle or axles of the trucks.

In accordance with the applicable legal regulations, the additional axle is raised in order to ensure traction in certain cases Increase soil conditions.

15th

The lifting devices used so far for this purpose have pneumatic cylinders or air springs that are on with the Pull rods connected to the axle to be lifted act directly or by means of levers that can be rotated around a cross shaft of the vehicle. In Such devices serve the pneumatic cylinder or air springs to the effect of the leaf springs or other elastic Pick up parts such as fluid springs that are part of the vehicle suspension, usually the suspension is mixed, i.e. it has leaf and air springs.

25th

The known lifting devices are complicated and expensive to manufacture. The object of the invention is therefore to provide a lifting device which is simpler and cheaper to manufacture and has the same or better functional properties than known devices.

This object is achieved with the features of claim 1.

The mechanical springs are preferably leaf springs. The fluid springs are preferably pneumatic or hydraulic Feathers.

^Γ -3- 350114?

According to the invention are to raise or lower the additional Axis the fluid springs contracted or pushed apart .

An advantage of the device according to the invention is that the mechanical springs operate in an opposite manner act as usual, make a pressure control valve in the fluid springs superfluous when changing the vehicle trim: at The lower the additional axle and the less the vehicle is loaded, the more the fluid springs are due to the effect compressed by the mechanical springs, which are heavily loaded under these conditions, since the vehicle is relatively high stands on the road. On the other hand, the more the vehicle is loaded, the lower it is on the road, which means the unloaded spring of the fluid spring takes away only a little of the load.

This is advantageous because the more the vehicle is loaded ,

the less the leaf springs or other mechanical *

Feathers are claimed, which form the connection between the additional Ii- ν Establish the axle and the frame.

The pressure in the fluid springs is preset according to the load to which the additional axle is subjected. 25th

The invention is explained in more detail below with reference to the drawing. Show it

1 shows a schematic longitudinal section of a vehicle with a lifting device for the additional support axle

according to a preferred embodiment with a lowered additional axle;
2 shows a longitudinal section with the additional axle raised; and

3 shows an enlarged partial cross-section along the line IH-III in Fig. 1

ΐ ^Γ -4- 350114?

The figures show longitudinal members 1 of the vehicle frame of a truck, mechanical springs 2, preferably in FIG Form of leaf springs, an air spring 3 as a suspension fluid spring and an additional support axle 4; Instead of the air spring 3, a hydraulic spring can also be used as the suspension fluid spring Spring be provided.

The axle 4 is fastened to the frame 1 via the leaf spring 2. In contrast to conventional wheel suspensions, this spring 2 acts upwards and thus lifts the axle 4.

According to FIG. 1, the direction of action of the mechanical spring or the fluid spring 3, which contains air or another fluid under pressure, is opposite.
15th

Lowered around the additional axis 4 from that shown in FIG To bring position into the raised position shown in Fig. 2, it is sufficient to release a pressure in the Make fluid spring 3 so that the mechanical spring 2 can act according to v 20 above.

In order to bring the additional axle back into the lowered position of FIG to put against the action of the mechanical spring 2 under pressure.

As already mentioned above, the device of the invention does not require any pressure regulating valves. To set axis 4 you only need equipment for pressurization or Pressure relief, for example in the form of a three-way valve, on the one hand with a compressed air source and on the other hand is connected to the ambient air, may be present.

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Claims (3)

vossius · vossius -tauchner · h eunemann · rauh fp * t-ntanw * ltB 3501142 'SIEBERTSTRASSE 4 · 8OOO MÜNCHEN 86 · PHONE: (O89) 47 4O 75 CABLE: BENZOLPATENT MDNCHEN · TELEX 5-29 453 VOPAT D January 15, 1985 uZ: T 520 + HGM (He / DP) OFFICINE VIBERTI SpA Nichelino (Torino), Italy 10 Device for lifting the additional support axle of trucks Claims 1. Device for lifting an additional wheel axle (4) of trucks, in which fluid springs are provided between the additional axle (4) and the vehicle frame for axle suspension, characterized in that between ^ the additional axle (4) and the vehicle frame (1) mejchani- * see springs (2) are provided, which act in the stroke direction of the additional axis (4), and "that when pressure is released from the fluid springs (3) by the mechanical springs (2) the axis (4) is raised and at Pressurization of the fluid springs (3) the axis (4) is lowered against the action of the mechanical springs (2). 2. Device according to claim 1, characterized in that the mechanical springs (2) are leaf springs: 3. Apparatus according to claim 1 or 2, characterized in that the fluid springs (3) pneumatic or hydraulic Springs are ind. ^{L J}