DE20009280U1 - Paver - Google Patents

Description

GRÜNECKER, KINKELDEY, STOCKM'AIR &

LAW FIRM

LAW FIRM MAXIMIUANSTRASSE 58 D-80538 MUNICH GERMANY

Applicant:

JOSEPH VOEGELE AG

NECKARAUER STR. 168-228
68146 MANNHEIM

LAWYERS

MUNICH

DR. HELMUT EICHMANN

GERHARD BARTH

DR. ULRICH BLUMENRÖDER, LLM.

CHRISTA NIKLAS-FALTER

DR. MAXIMILIAN KINKELDEY, LLM.

SONJA SCHAEFFLER

DR. KARSTEN BRANDT

ELISABETH RUSCH

ANJA FRANKE, LL.M.

UTE STEPHANI

DR. BERND ALLEKOTTE

OF COUNSEL
PATENT ATTORNEYS

AUGUST GRÜNEECKER
DR. GUNTER BEZOLD
DR. WALTER LANGHOFF

OR. WILFRIED STOCKMAIR (-1996)

PATENT ATTORNEYS

EUROPEAN PATENT ATTORNEYS

MUNICH

DR. HERMANN KINKELDEY

PETER H. JAKOB

WOLFHARD MEISTER

HANS HILGERS

DR. HENNING MEYER-PLATH

ANNE EHNOLD

THOMAS SCHUSTER

DR. KLARA GOLDSACH

MARTIN AUFENANGER

GOTTFRIED KUTZSCH

DR. HEIK£ 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. (Uof PA) M.S. (ENSPM)

BERND ROTHAEMEL

DR. DANIELA KINKELDEY

DR. MARIA R. VEGA LASO

COLOGNE

DR. MARTIN DROPMANN

CHEMNITZ

MANFRED SCHNEIDER

YOUR REF.

OUR REF.

G4284-25/Ma DATE

23.05.00

Road pavers

MAXIMILIANSTRASSE 58

D-80538 MUNICH

TEL 089/21 23 50 ***. '.'"

FAX (size 3) 089 / 22 02 87, (size A) 089 / 21 %b Φ J3*
http://www.grunecker.de ··.* ?...

e-mail: postmaster@grunecker.de

KAISER-WILHELM-RING 13 D-50672 COLOGNE

FA\(GC3) ANNABERGER STRASSE 73
D-09111 CHEMNITZ
."^'93.71/S 63 63 49 ·
I ⁵ AX^I/5 «3 62 j>9 j *

e-mail.· dropmann®grunecker.de e-mail: schneider^Qruneckercfe

DEUTSCHE BANK MUNICH NO. 17 51734
Bank code 700 700 10 SWIFT: DEUT DE MM

Road pavers

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

High-performance road pavers are relatively heavy. In the case of a road paver with a wheeled chassis, the axle load on the rear axle(s) can exceed the 12t axle load prescribed by the Road Traffic Licensing Regulations when the paving screed is raised for transport, meaning that the road paver can no longer drive independently on public roads during transport.

The road finisher known from DE 1 951 31 95 A is characterized by the fact that the weight or the center of gravity of the screed unit is shifted forwards in the longitudinal direction of the finisher using the adjustment device in order to reduce the axle load. This results in a higher load in the front axle area with simultaneous relief in the rear axle area. The adjustment device of the known road finisher allows the screed to be adjusted forwards up to the transverse distribution device, whereby the beams are raised with the traction points attached to the chassis using pivot joints. The Svedala-Demag DF 90 P compact paver, which corresponds to DE 19 513 195 A and was presented, for example, at the 41st Nordbau in Neumünster in 1996, shows that the leveling beam guide permanently attached to the chassis has an upper guideway section for the traction point, which continues forward in the working direction and in which the traction point raised by means of the leveling drive is adjusted forwards.

The invention is based on the object of creating a road paver of the type mentioned at the beginning, which is characterized by a structurally simple, different adjustment device for moving the paving screed forward.

The stated object is achieved according to the invention with the features of claim 1.

In order to reduce the rear axle load, the leveling bar guide on the chassis is adjusted and the towing point is forcibly adjusted forward via the leveling bar guide with the screed unit.

If the entire leveling beam guide is adjustable, a portion of the weight of the leveling beam guide is also shifted forwards when the weight of the screed unit is shifted, which helps to relieve the load on the rear axle. Furthermore, the leveling beam guide shifted forwards can be used to force the screed unit forwards, which simplifies the adjustment device and contributes to a simple movement sequence. The leveling beam guide thus takes on a dual function, for which it does not require any further modifications other than the movable attachment to the chassis.

The guide track required for the leveling function during the paving operation of the screed is used profitably in the relief position of the leveling beam guide to pull the screed unit forwards or move it backwards again. Thanks to the inclined position of the guide track, moderate actuating forces are sufficient for this movement sequence.

If the leveling drive used for the normal leveling function is also used to adjust the traction point along the inclined guideway, no additional motion drives are required for moving the screed unit forward or resetting the screed unit.

It is practical to use the same guide track for levelling and for longitudinal adjustment of the screed.

The leveling beam guide is structurally simple and is swivelled back and forth around a swivel axis between the two fixed positions. An automatic or manually operated locking mechanism can be provided in the respective position so that the leveling beam guide remains in the selected position and the forces introduced by the traction point or exerted on the traction point are absorbed by the chassis. If the swivel axis coincides with the traction point axis at a certain, e.g. relatively low, setting of the traction point of the beam,

When these two axes are aligned, the leveling beam guide can be easily swivelled, e.g. even by hand, because the pulling point with the large forces acting on it then has no inhibiting influence.

However, it is conceivable to provide a swivel drive for the guide block of the leveling beam guide, for example an electric or hydraulic actuator, so that the swiveling can not only be controlled remotely, but can also be carried out against forces acting on the pulling point.

In an alternative embodiment, the leveling beam guide is arranged stationary on the chassis and is designed with two guideways that are set in a V shape. The guideways are connected to each other. When changing the position, either the connection is released for the towing point to pass through, or the towing point or beam is released to move into the other guideway. When the towing point is raised along the other guideway, this simultaneously forces the screed unit forward to relieve the load on the rear axle.

If the guide piece is arranged in the connecting area of the two guide tracks, then it only needs to be adjusted accordingly in the leveling beam guide.

Alternatively, it may be useful to have the guide piece engage the traction point or the bar in order to prevent the traction point from crossing when it is in the lowest position. After repositioning the guide piece, the traction point can then be moved to the other guide track.

In order to reduce the operational risk during transport or to prevent undesirable movements of the screed when it is moved forwards, a locking device, preferably an automatic one, should be provided for the screed unit in the raised and forwards position, which is conveniently supported on the chassis.

.· Oil *'4 *♦··

Since a relatively large adjustment stroke for the screed may have to be traversed, it may be advisable to move the leveling drive from one swivel connection point to another in order to be able to easily control this large adjustment stroke.

This type of rear axle relief is particularly useful for a wheel chassis with one or two rear wheel axles.

An embodiment of the invention is explained with reference to the drawing. Shown are:

Fig. 1 is a schematic side view of the rear part of a road finisher, with two different positions of the screed unit, and

Fig. 2 a detailed variant.

A road finisher F, of which only the rear part of the vehicle is shown schematically in Fig. 1, has a chassis 1 which is supported on the ground via a running gear 2 and is mobile. As is usual with a road finisher, the chassis has a material hopper at the front, behind it a primary drive source and a driver's cab (not shown) and at the rear end of the chassis 1 a transverse distribution device Q. A rear wheel 3 is indicated on the running gear 2, a wheeled running gear in Fig. 1, on which the chassis 1 is supported via a rear wheel axle 4. One of the front wheels 5 can be seen in dashed lines.

The road finisher F tows a screed B behind the transverse distribution device Q, which is used to place the paving material supplied via the transverse distribution device onto the subsoil. The paving screed is connected to a leveling bar guide A on the chassis 1 with two lateral beams H, each with a pulling point P. To adjust the angle of attack of the paving screed B, each pulling point P in the guide A can be adjusted up and down using a leveling drive N. The paving screed B, possibly a paving screed with extendable screed parts, has a base body 6, which is connected to the ends of the two beams H at 7.

The road paver F is equipped with an adjustment device V with which the unit consisting of the paving screed B and the two beams H, e.g. in the raised state, can be moved forward in the working direction or the paver's longitudinal direction L in order to relieve the load on the rear wheel axle 4 by placing a greater load on the front axles.

Furthermore, a lifting device D, e.g. two hydraulic cylinders 18, is provided on the chassis 1 via boom 20, which engages via connection points 17, for example on the beams H. Each hydraulic cylinder 18 can be pivoted back and forth in its boom 20 in a pivot bearing 19. Furthermore, an automatic locking mechanism 22 is indicated, with which the screed B is locked to the chassis 1 in the raised and forward-displaced position (upper position in Fig. 1).

The lower position a shown in Fig. 1 represents the installation position of the screed B. The upper position b of the screed B represents the transport position with the rear wheel axle 4 partially relieved. Between the two positions, the screed B has a stroke c in the paver's longitudinal direction L, which can be between 100 and 200 mm or more, for example. In order to enable the installation position and the transport position, the leveling beam guide A can be switched on each side between a traction point installation position d) and at least one traction point relief position e.

Part of the adjustment device V is the leveling beam guide A on each side of the chassis. The leveling beam guide A is designed in the manner of a frame 9, which overlaps each beam H on the inside and/or outside and contains guideways 10 for the traction point P, which is designed, for example, as a pin 8. The leveling beam guide A in Fig. 1 can be moved as a whole in the paver's longitudinal direction L between the traction point installation position d, in which the guideways 10 are oriented approximately vertically, and the traction point relief position e, in the embodiment shown with a pivoting movement about a low-lying pivot axis 11 on the chassis 1. In each position, the guide A is blocked by a lock 12 or 16 on the chassis. These locks 12, 16 can be of different designs; they are expediently bolt locks that can be adjusted either manually or automatically between release and engagement positions.

ft· ·

·

The leveling drive N is attached to a pivot point 13 at the front end of each beam H. The leveling drive N is, for example, a hydraulic cylinder 21 which is supported in a pivot connection point 14 on the chassis 1 so that it can perform pivoting movements. If necessary, at least one further pivot connection 14' is provided on the chassis so that the hydraulic cylinder 21 can be optionally supported on both pivot connections 14, 14'. Using the leveling drive N, for example, the pulling point P can be adjusted downwards until it at least roughly coincides with the pivot axis 11. Then the pivoting resistance of the leveling beam guide A is so low that it can even be adjusted by hand. If necessary, however, a pivot adjustment drive 15, e.g. a hydraulic cylinder, a mechanical or an electromechanical actuator, is provided which carries out the adjustment movements of the guide A between its two positions.

Function of the adjustment device V:

First, the screed is lifted slightly off the ground using the lifting device D. Then, for example using the leveling drive N, the pulling point P is brought into line with the swivel axis 11. The lock 12 is then released and the leveling bar guide A is swiveled from position d to position e and secured with the lock 16. During or after this, the screed B is lifted out using the lifting device D. The leveling drive N then pulls the pulling point P upwards along the guide track 10, shifting the screed B forwards. The lifting and shifting forwards can be carried out in an overlapping manner, whereby care must be taken that the screed B does not collide with the transverse distribution device Q. When the screed unit has reached the forward-shifted position shown in Fig.1 above, the lock 22 is engaged. The road paver carries out its transport journey with the rear axle 4 partially unloaded.

If necessary, the cylinder 21 is repositioned onto the swivel connection 14' before the beam H is raised. When lifting, the screed B is pulled forwards via the pulling point sliding on the guide track 10.

In order to return the screed B to the installation position a, the locking mechanism 22 is first released and the pulling point P is moved downwards along the guide track. In the process, the screed B is moved backwards. If necessary, the screed B is lowered at the same time using the lifting device D. As soon as the pulling point P has reached approximately the pivot axis 11 or just above it, the locking mechanism 16 is released and the leveling beam guide A is pivoted back into position d and locked with the locking mechanism 12. The road paver is then converted back to paving operation. Alternatively, it is conceivable to first raise the pulling point P with the guide track 10 oriented vertically and then use the pivot adjustment drive 15 to move the guide A and with it the screed B forwards.

In the embodiment of Fig. 4, the leveling beam guide A has two frames 9, 9' arranged in a V-shape with guide tracks 10, 10' for the traction point P. The guide tracks 10, 10' are connected to one another at the bottom at 23. The guide track 10' is inclined upwards at an angle to the front. A guide piece 24 can be adjusted from the installation position d shown, which blocks the crossing of the traction point P, e.g. in the direction of an arrow 25, into a relief position e (dashed). The guide piece does not have to be provided in the guide A, but the guide piece could alternatively engage the beam H or the traction point P.

Claims (15)

1. Road finisher (F) with a chassis ( 1 ) which can be moved on a running gear ( 2 ), in particular a wheeled running gear, to which a transverse distribution device (Q) is mounted at the rear and beams (H) of a screed (B) towed behind the transverse distribution device (Q) are articulated in pulling points (P) in lateral leveling beam guides (A), with lifting devices (D) supported on the chassis and engaging the beams (H) for lifting the screed, and with an adjusting device (V) for adjusting the lifted screed relative to the chassis ( 1 ) and in the longitudinal direction (L) of the finisher, characterized in that each leveling beam guide (A) on the chassis ( 1 ) can be adjusted between a pulling point installation position (d), in which the pulling point (P) articulated to it can be adjusted in height without any significant longitudinal adjustment of the screed (B), and a pulling point relief position (e) is adjustable, in which the pulling point (P) can be adjusted in height by longitudinally adjusting the screed unit (B). 2. Road finisher according to claim 1, characterized in that the leveling bar guide (A) is movable for conversion relative to the chassis ( 1 ) into the traction point installation position (d) and the traction point relief position (e). 3. Road finisher according to claim 1, characterized in that the leveling beam guide (A) forms a guide track ( 10 ) for the traction point (P), which in the traction point installation position (d) is aligned approximately vertically and in the traction point relief position (e) is inclined upwards and obliquely forwards in the working travel direction. 4. Road finisher according to claim 1, characterized in that a leveling drive (N) is provided which is supported on the chassis ( 1 ), preferably pivotably, and acts on the traction point (P) or on the beam (H), preferably one leveling cylinder ( 21 ) per chassis side, and that the traction point (P) can be moved along the guide track ( 10 ) by means of the leveling drive (N) in any setting of the leveling beam guide (A). 5. Road finisher according to claim 3, characterized in that the guide track ( 10 ) for the traction point (P) which is adjustable in height for leveling the screed (B) can also be used as a guide track for longitudinal adjustment of the screed (B) in the traction point relief position (e) of the leveling beam guide (A). 6. Road finisher according to claim 2, characterized in that the leveling beam guide (A) is a frame-like guide block ( 9 ) which can be pivoted back and forth on the chassis ( 1 ) about a low-lying pivot axis ( 11 ) between the traction point installation position (d) and the traction point relief position (e), and which can be locked in a pivot-proof manner on the chassis ( 1 ) in both positions (d, e), preferably by means of manually or automatically operable locks ( 12 , 16 ). 7. Road finisher according to claim 6, characterized in that in at least one lower setting of the traction point (P) along the guide track ( 10 ), the pivot axis ( 11 ) is at least approximately aligned with the traction point (P). 8. Road finisher according to claim 6, characterized in that the guide block ( 9 ) can be pivoted by hand. 9. Road finisher according to claim 6, characterized in that a swivel drive ( 15 ) is provided for the guide block ( 9 ), preferably a mechanical, hydraulic or electrical swivel drive ( 15 ). 10. Road finisher according to claim 1, characterized in that the leveling beam guide (A) is arranged stationary on the chassis ( 1 ) and is designed with a first, approximately vertical guide track section ( 10 ) defining the traction point installation position (d) and a second guide track section ( 10 ') connected to the first at the bottom and extending obliquely upwards to the front, and that a removable or unlockable guide piece ( 24 ) is provided for conversion. 11. Road finisher according to claim 10, characterized in that the guide piece ( 24 ) is arranged in a connecting region ( 23 ) between the two guide track sections ( 10 , 10 '). 12. Road finisher according to claim 10, characterized in that the guide piece ( 24 ) is arranged to be movable away from a blocking position directly engaging the beam (H) or the traction point (P), and that the guide track sections ( 10 , 10 ') for the traction point (P) are permanently connected to one another. 13. Road finisher according to at least one of the preceding claims, characterized in that a preferably automatic locking mechanism ( 22 ) is provided for the raised paving screed (B) which is displaced forwards in the traction point relief position (e) when the traction point (P) is raised. 14. Road finisher according to claim 4, characterized in that more than one chassis-fixed swivel connection point ( 14 , 14 ') is provided for optionally connecting the leveling drive (N) to the chassis ( 1 ). 15. Road finisher according to at least one of the preceding claims, characterized in that the chassis ( 2 ) is a wheel chassis with at least one rear wheel axle ( 4 ).