DE29920556U1 - Paver - Google Patents

Description

GRÜNEECKER,

L.|CHWANHOUSES

LAW FIRM

LAW FIRM MAXIMILIANSTRASSE S8 D-80538 MUNICH GERMANY Applicant:

JOSEPH VOEGELE AG

NECKARAUER STR. 168-228
68146 MANNHEIM

LAWYERS

MUNICH

DR. HELMUT EICHMANN

GERHARD BARTH

DR. ULRICH 8LUMENRÖDER, LLM.

CHRISTA NIKLAS-FALTER

DR. MAXIMILIAN KINKELDEY, LLM.

SONJA SCHAEFFLER

DR. KARSTEN BRANDT

OF COUNSEL

PATENT ATTORNEYS

AUGUST GRÜNEECKER
DR. GUNTER 3EZOLD
DR. WALTER LANGHOFF

OR. WILFRIED STOCKMAIR (-1996)

PATENT ATTORNEYS

EUROPEAN PATENT ATTORNEYS

MUNICH

DR. HERMANN KINKELOEY

DR. KLAUS SCHUMANN

PETER H. JAKOB

WOLFHARD MEISTER

HANS HILGERS

DR. HENNING MEYEFLI-PLATH

ANNELIE EHNOLD

THOMAS SCHUSTER

DR. KLARA GOLDBACH

MARTIN AUFENANGER

GOTTFRIED KLITSCH

DR. HEIKE VOGELSANG-WENKE

REINHARD KNAUER

DIETMAR KUHL

DR. FRANZ-JOSEF ZIMMER

BETTINA K. REICHELT

DR. ANTON K. PFAU

DR. UDO WEIGELT

RAINER BERTRAM

JENS KOCH, M.S. (UofPA) M.S. (ENSPM)

COLOGNE

DR. MARTIN DROPMANN

YOUR REF.

OUR REF.

G4168-25/SÜ DATE / DATE

22.11.99

Road pavers

MAXIMILIANSTRASSE 58 D-80535 M[IrJCHEN .* "J **3\ISEFV?VIL&ELii-RING 33 D-Su|72 TEL 089/21 23 50 FAX (Gr.3) 089 / 22 02 87TfOr.4^98?/ -21 &eegr;&bgr;&Igr;&Tgr; 93" TEV0221*/W?7 ?2 O FRV(Gi J)*022f/*?4 97 22*2 http://www.grunecker.de - e-mail: postmaster@grunecker.de e-mail: dropmann@grunecker.de

ÖEUTSCHE BANK MÜNCHEN NO. 17 51734 · * Bank code 700 700 10 SWIFT: DEUT DEMM

Road pavers

The invention relates to a road paver of the type specified in the preamble of claim 1.

A road paver with wheeled chassis can be driven on public roads for moving or transport without a special permit, provided that the weight of the most heavily loaded wheel axle remains below a publicly prescribed value, currently below 12 t in Germany. This is usually difficult to comply with for the rear wheel axle, as the trend towards larger, more powerful road pavers with many additional functions and a total weight of 20 t and more leads to extraordinarily high weight forces of the rear wheel axle on the ground. In particular, the use of a powerful high-compaction paving screed leads to the effect that the rear axle load becomes too high when the paving screed is raised and locked to the chassis for transport or moving the road paver.

The invention is based on the object of creating a road paver with wheeled chassis in which, despite the high total weight, the permissible loads on the subsoil are not exceeded on any wheel axle.

The stated problem is solved with the features of claim 1.

The device can be used to partially relieve the load on the wheel axle that is subject to the highest load in order to keep the load on the ground within the officially prescribed range. The road paver can be transported and moved on public roads despite its high total weight. Partial relief is useful when the load on the ground on the rear wheel axle would become too great when the paving screed is raised and locked to the chassis. The device does not need to intervene during normal work travel.

If a front wheel axle is also pushed downwards, the rear wheel axle is relieved for transport. If the front wheel axle is raised because the device simply allows this, the rear wheel axle is also loaded and the traction on the rear wheels can be increased during work travel. In this context, a floating position of the front wheel axle or one of the front wheel axles that can be easily moved is beneficial for the work of the road paver. The transverse swinging of the front axle can still be present if necessary.

Alternatively, a longitudinal adjustment of at least one front wheel axle (variable wheelbase) leads to a partial reduction in the load on the rear wheel axle by changing the force ratio. The individual longitudinal adjustability on each side could also be used for steering or to increase the traction on the rear axle.

The device expediently has at least one freely rotating, possibly driven support wheel that can be pressed onto the ground. The support wheel partially relieves the load on the otherwise excessively loaded rear wheel axle, whereby not only does the support wheel take up excess load, but the front wheel axle can also be subjected to a higher load due to the influence of the support wheel. The at least one support wheel is effectively assigned either to the chassis of the road paver or directly to the paving screed.

In a particularly simple construction, a wheel chassis with two front wheels one behind the other on a tandem wheel axle is pressed onto the ground using the device, or bolted to the chassis, for example if the rear screed has not yet been lifted out. This allows the rear wheel axle to be partially relieved of load. However, the transverse oscillation should be retained.

Alternatively, at least one support wheel is provided at or near the rear end of the chassis, which is pressed onto the ground and partially relieves the load on the rear wheel axle.

· · 1

In a further alternative, the at least one support wheel or the device is arranged on the screed, where it takes on at least part of the load when the screed is raised.

In another alternative, the support wheel can be lowered below the support surface of the screed in order to take up at least part of the load of the screed and to partially relieve the rear wheel axle. If necessary, the screed is placed on the support wheel underneath.

The device should be provided with a pressing and/or lowering mechanism for the support wheel so that the support wheel can only be pressed for transport or when moving onto the ground, but can be held in a passive position during normal working travel of the road finisher. If necessary, the support wheel, which can be steered if necessary, runs permanently without increased pressure. It is advisable to have the pressed support wheel suspended.

The pressure load of the support wheel should be adjustable in order to be able to select the partial relief of the rear wheel axle with regard to good maneuverability and steerability of the road paver during transport or when moving, i.e. to be able to adjust the partial relief just so that the official regulations are met.

By raising or lowering the rear wheel axle in the chassis in conjunction with the adjustability of the front wheels, the load on the rear axle could even be increased by changing the force ratios in order to transmit increased tractive force during work travel.

Two or more support wheels can be provided in the transverse direction of the road paver, for example one on each side. These share the forces when the load is partially relieved towards the rear wheel axle. However, one support wheel, which does not even have to be positioned in the middle, is usually sufficient.

Since the support wheel is only needed when the load on the rear wheel axle increases too much due to the raised and locked screed, it is advisable to link a control for lifting and locking the screed to a control of the device so that the support wheel is automatically lowered and pushed up when the screed is raised. In this case, a link could be provided with the cylinder for lifting the screed and/or with the auger height adjustment.

Since official regulations limit the maximum load to 12 t, it is advisable if the partial unloading leads to an axle load of no more than 121.

Embodiments of the subject matter of the invention are explained with reference to the drawing. They show:

Fig. 1 is a side view of a road finisher in a condition for transport,

Fig. 2 another embodiment,

Fig. 3 a road finisher of another embodiment,

Fig. 4 another embodiment of a road finisher,

Fig. 5 another embodiment of a road finisher,

Fig. 6 shows another embodiment of a road finisher, and

Fig. 7 shows another embodiment of a road paver.

A road paver F in Fig. 1 is equipped with a wheeled chassis R on a chassis 1. On the chassis 1, a material hopper 2 is arranged at the front in the working direction, behind which there is a primary drive source 3 and behind this a driver's cab 4.

I · ··♦·

A screed B, for example a high-compaction screed of the extendable type, is connected to the chassis 1 via side beams 6. In the space between the screed B and the rear end of the chassis 1 there is a transverse distribution device 5 (for example a screw arrangement), which can be moved up and down via a height adjustment if necessary and is then raised for transport.

In this embodiment, the wheel chassis R has a front and a rear front wheel 7, 8 on each chassis side, e.g. on a pendulum axle carrier 9, which is supported on the chassis 1 via a tandem wheel axle 10. One rear wheel 11 per chassis side is supported on the chassis 1 via a rear wheel axle 12. It is conceivable to provide two rear wheels one behind the other per chassis side, or only one front wheel per chassis side.

Hydraulic cylinders 14 are hinged to chassis-fixed booms 13, which engage the screed B or the beams 6 in order to lift the screed B from the ground P for a transport journey and to block it with the chassis 1.

To partially relieve the load on the rear wheel axle 12, a device V is provided with at least one support wheel 15 that can be pressed onto the ground B, is free-running or driven and, if necessary, even steerable. Two devices, each with at least one support wheel 15, or one device with more than one support wheel 15 could be provided across the width of the paver. A pressing and/or lowering mechanism M for the support wheel 15 can be provided in the device V. This mechanism can be combined, for example, with the hydraulic auger height adjustment. If necessary, the support wheel 15 runs permanently. The mechanism M then increases the pressing force of the support wheel 15 when the rear wheel axle 12 is to be relieved, i.e. when the axle load on the rear wheel axle 12 becomes too high due to the raised screed, e.g. higher than 121. In Fig. 1, the support wheel 15 is located in a holder 16 below the space between the rear chassis end and the screed B. The device V is expediently arranged at the rear chassis end. Conceivably

would be to provide the device at the front of the screed B (not shown).

In Fig. 2, the support wheel with the device V is provided on the rear side of the screed B. A pivotable wheel carrier 17 is hinged to the screed B. Pressure cylinders 18 serve to pivot the wheel carrier 17 with the support wheel 15. At least one support wheel 15 (or several) is expediently provided across the width of the screed B, which could be rotatable about a steering axis, for example for better caster and also for steering.

In Fig. 3, the device V with the at least one support wheel 15 is arranged in the space between the rear front wheels 8 and the rear wheels 11 on the chassis 1. By means of the mechanism M, e.g. a hydraulic cylinder 18, the support wheel 15 can be pressed against the ground P. A combination of the hydraulic cylinder 18 with a compression spring 23 is expedient in order to have a suspension for the support wheel 15 during transport.

In the embodiment in Fig. 4, the device V is integrated into the paving screed B in such a way that the support wheel 15 or the support wheels 15 are supported on the ground P below the support surface 20 of the paving screed via wheel carriers 19. The support wheel 15 on the ground P relieves the rear wheel axle 12 of the road paver F at least partially.

Alternatively, the screed B can be lifted and placed on the support wheel 15 (or two or more support wheels 15 if necessary) which is placed underneath with a bracket 21. The degree of relief can be adjusted here, for example, using the cylinders 14.

In Fig. 5, for example, the rear front wheel 8 is entrusted with the function of the support wheel 15 for partially relieving the rear wheel axle 12. By means of the mechanism M (for example a cylinder), the rear front wheel 8 as the support wheel 15 is then pressed against the ground P with increased contact pressure when the rear wheel axle 12 is to be relieved.

loads. The mechanism M could also enable lifting or a floating position. However, the front wheel axle 10 or the wheel 7 could also be raised or placed in a floating position, whereby the transverse oscillation of the front axle is maintained.

Alternatively, in Fig. 6, no pressing device is used and the rear front wheel 8 of the two front wheels 7, 8 arranged one behind the other is blocked or bolted relative to the chassis 1 -- whereby the transverse oscillation of the front axle is expediently retained.

In a further embodiment, not shown, the support wheel 15 could also be pressed onto the ground P directly below the rear wheel axle 12. If the rear wheel axle 12 (arrow 22 in Fig. 4) itself can be raised or lowered, the rear wheel axle 12 can also be subjected to a greater load during work travel by raising or lowering at least one front wheel 7, 8 or the front wheel axle 10 in order to relieve the rear axle for transport travel, in order to then apply a higher tractive force to the ground.

In Fig. 7, at least one front wheel axle can be adjusted backwards and forwards in the longitudinal direction (variable wheel base), preferably the swing axle 10, in order to partially relieve the load on the rear wheel axle 12 when adjusted backwards. The mechanism M can have a cylinder (e.g. 18) (hydraulically or pneumatically), or can be operated electrically and/or mechanically. Such types of actuation can be used optionally in each embodiment. In this case, it is advantageous to design the wheel axle (or swing axle) which is longitudinally adjustable on one side of the chassis so that it can be adjusted independently of the other. The device could then even be used for steering.

Claims (14)

1. Road finisher (F) with a wheeled chassis (R) having rear and front wheel axles ( 10 , 12 ) and a towed paving screed (B) connected to the chassis ( 1 ) of the road finisher via beams ( 6 ), which can be lifted for transport on the ground (P) and supported on the chassis ( 1 ), characterized in that the road finisher (F) has an optionally activatable device (V) for partially relieving the load on at least one rear wheel axle ( 12 ) relative to the ground (P). 2. Road finisher according to claim 1, characterized in that a front wheel axle ( 10 ) can be lowered or raised relative to the chassis ( 1 ), for example by means of a cylinder ( 18 ), or hydraulically, pneumatically, electrically or mechanically. 3. Road finisher according to claim 1, characterized in that at least one front wheel axle ( 10 ) on the chassis ( 1 ) is adjustable in the longitudinal direction. 4. Road finisher according to claim 1, characterized in that the device (V) has at least one support wheel ( 15 ) which can be pressed onto the ground (G) in order to partially relieve the load on the rear wheel axle ( 12 ). 5. Road finisher according to claim 4, characterized in that in a wheeled chassis (R) with two front wheels ( 7 , 8 ) on a tandem axle ( 10 ), at least one front wheel ( 7 , 8 ), preferably the rear front wheel ( 8 ) in the transport direction, can additionally be pressed onto the ground (P) as a support wheel ( 15 ) or can be blocked with the chassis ( 1 ). 6. Road finisher according to claim 4, characterized in that a front wheel ( 8 ) serving as a support wheel ( 15 ) can be locked directly or indirectly to the chassis ( 1 ). 7. Road finisher according to claim 4, characterized in that the device (V) with the support wheel ( 15 ) is arranged at the rear end of the chassis or on a height-adjustable auger bearing block. 8. Road finisher according to claim 4, characterized in that the device (V) with the support wheel ( 15 ) is arranged on the paving screed (B), preferably on its rear side. 9. Road finisher according to claim 8, characterized in that the support wheel ( 15 ) is or is to be arranged on the paving screed (B) and can be brought under the support surface ( 20 ) of the paving screed (B). 10. Road finisher according to at least one of the preceding claims, characterized in that the pressing load of the support wheel ( 15 ) is adjustable. 11. Road finisher according to claim 4, characterized in that the device (V) has a pressing and/or lowering mechanism (M) for the support wheel ( 15 ), and that preferably the pressed support wheel is spring-loaded, e.g. by means of a compression spring. 12. Road finisher according to at least one of the preceding claims, characterized in that at least two support wheels ( 15 ) are provided in the transverse direction of the road finisher. 13. Road finisher according to at least one of the preceding claims, characterized in that a control (C) for the pressing and/or lowering mechanism (M) is linked to a control for raising and blocking the paving screed (B) or a distribution auger ( 5 ). 14. Road finisher according to claim 1, characterized in that the rear wheel axle ( 12 ) can be partially unloaded, for example by means of the support wheel ( 15 ), to a value below 12 t.