Tamper stroke adjustment

Patent metadata

Field	Value
Publication number	US-12077920-B2
Application number	US-202217575687-A
Country	US
Kind code	B2
Filing date	Jan 14, 2022
Priority date	Jan 14, 2021
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

The disclosure relates to a road finishing machine with a screed for producing a paving layer, wherein the screed includes at least one compacting unit for precompacting paving material supplied to the screed. The compacting unit includes at least one eccentric bushing mounted on an eccentric shaft supporting the same at a desired angle of rotation to thereby continuously variably set a desired tamper stroke of a tamper bar of the compacting unit. For rotating the eccentric bushing on the eccentric shaft, an adjusting mechanism mounted spaced apart from the eccentric shaft and at least partially rotatable along with a rotary motion of the eccentric shaft can be activated. Furthermore, the disclosure relates to a method for a continuously variable tamper stroke adjustment at a compacting unit of a road finishing machine.

First claim

What is claimed is:

1. A road finishing machine with a screed for producing a paving layer, wherein the screed includes a compacting unit for precompacting paving material supplied to the screed, wherein the compacting unit includes an eccentric bushing mounted on an eccentric shaft, wherein the eccentric bushing is rotatable relative to the eccentric shaft to a desired angle of rotation to thereby continuously variably set a desired tamper stroke of a tamper bar of the compacting unit, and wherein for rotating the eccentric bushing relative to the eccentric shaft, an adjusting mechanism mounted spaced apart from the eccentric shaft and at least partially rotatable along with a rotary motion of the eccentric shaft is activatable.

2. The road finishing machine according to claim 1 , wherein the adjusting mechanism comprises an adjusting drive that can be activated for rotating the eccentric bushing and which is rotationally driven by means of the rotary motion of the eccentric shaft as such, and/or an adjusting transmission that can be activated for rotating the eccentric bushing and is rotationally driven by means of the rotary motion of the eccentric shaft.

3. The road finishing machine according to claim 2 , wherein the adjusting drive and/or the adjusting transmission can be activated to adjust an angle of rotation of a machine element rotatably mounted on the eccentric shaft.

4. The road finishing machine according to claim 3 , wherein the machine element itself forms the eccentric bushing or is connected to the eccentric bushing by means of a positive clutch.

5. The road finishing machine according to claim 3 , wherein at least one further machine element is provided which is embodied for transmitting a rotary motion of the eccentric shaft to the adjusting drive and/or the adjusting transmission.

6. The road finishing machine according to claim 2 , wherein during an operation of the compacting unit, the adjusting drive and/or the adjusting transmission are/is rotationally driven at a same speed or at a speed different from that of the eccentric shaft.

7. The road finishing machine according to claim 2 , wherein the adjusting drive and/or the adjusting transmission are/is actuatable hydraulically, electrically and/or mechanically.

8. The road finishing machine according to claim 2 , wherein the adjusting drive includes an activatable servomotor, and/or a servomotor is provided for the adjusting transmission.

9. The road finishing machine according to claim 2 , wherein the adjusting mechanism comprises the adjusting transmission, and the adjusting transmission is embodied as a cam mechanism and/or includes a pair of rotatable deflection rollers.

10. The road finishing machine according to claim 9 , wherein the adjusting transmission comprises the pair of rotatable deflection rollers, and the pair of rotatable deflection rollers is movably mounted transverse to the eccentric shaft for rotating the eccentric bushing on the eccentric shaft.

11. The road finishing machine according to claim 2 , wherein the compacting unit comprises a plurality of the eccentric bushings rotationally mounted along the eccentric shaft, and wherein the adjusting mechanism is embodied for synchronously adjusting the plurality of the eccentric bushings, or the adjusting mechanism comprises a plurality of the adjusting drives and/or a plurality of the adjusting transmissions for separately adjusting the plurality of the eccentric bushings.

12. The road finishing machine according to claim 2 , wherein the adjusting drive and/or the adjusting transmission are/is activatable for setting the desired angle of rotation of the eccentric bushing by means of a controlling system.

13. The road finishing machine according to claim 12 , wherein the controlling system includes, for a dynamic adaption of the angle of rotation of the eccentric bushing, at least one control loop for responding to at least one process parameter detectable during operation of the road finishing machine.

14. The road finishing machine according to claim 2 , wherein the adjusting mechanism comprises at least one sensor unit which is embodied for detecting a set angle of rotation of the eccentric bushing on the eccentric shaft supporting the same and/or for detecting a tamper stroke of the tamper bar.

15. A method for a continuously variable tamper stroke adjustment at a compacting unit of a road finishing machine, the method comprising: rotating an eccentric bushing relative to an eccentric shaft on which the eccentric bushing is mounted to adjust tamper stroke, wherein for rotating the eccentric bushing relative to the eccentric shaft, an adjusting mechanism mounted at a distance to the eccentric shaft and at least partially rotating along with a rotary motion of the eccentric shaft is activated.

16. The method according to claim 15 , wherein the adjusting mechanism comprises an adjusting transmission that is activatable for rotating the eccentric bushing and is rotationally driven by the rotary motion of the eccentric shaft.

17. The method according to claim 15 , wherein the compacting unit comprises a plurality of the eccentric bushings rotationally mounted along the eccentric shaft, and the adjusting mechanism is operable to synchronously adjust the plurality of the eccentric bushings.

18. The method according to claim 15 , further comprising setting a desired angle of rotation of the eccentric bushing by a controlling system, wherein the controlling system includes, for a dynamic adaption of the angle of rotation of the eccentric bushing, at least one control loop for responding to at least one process parameter detectable during operation of the road finishing machine.

19. A method according to claim 15 , wherein the adjusting mechanism comprises at least one sensor unit that is configured to detect a set angle of rotation of the eccentric bushing on the eccentric shaft and/or to detect a tamper stroke of the tamper bar.

20. A road finishing machine comprising:
a screed for producing a paving layer, the screed comprising a compacting unit for precompacting paving material supplied to the screed, wherein the compacting unit includes:
a tamper bar;
an eccentric shaft;
an eccentric bushing mounted on the eccentric shaft, wherein the eccentric bushing is rotatable relative to the eccentric shaft to a desired angle of rotation to thereby variably set a desired tamper stroke of the tamper bar; and
an adjustment mechanism mounted spaced apart from the eccentric shaft and at least partially rotatable along with a rotary motion of the eccentric shaft, wherein the adjustment mechanism is activatable to rotate the eccentric bushing relative to the eccentric shaft.

Assignees

• Joseph Voegele Ag

Inventors

• Bertz Klaus
• Weiser Ralf
• Noll Tobias
• Pawlik Christian

Classifications

• E01C2301/20

  Screed or paver accessories for paving joint or edge treatment · CPC title

• E01C19/4873

  Apparatus designed for railless operation · CPC title

• E01C19/4853

  Apparatus designed for railless operation, e.g. crawler-mounted, provided with portable trackway arrangements · CPC title

• E01C19/486 Primary

  with non-vibratory or non-percussive pressing or smoothing means; with supplemental elements penetrating the paving to work the material thereof · CPC title

• E01C19/4833 Primary

  with tamping or vibrating means for consolidating or finishing, e.g. immersed vibrators, with or without non-vibratory or non-percussive pressing or smoothing means (E01C19/4806, E01C19/4886 take precedence; combined with rollers E01C19/488) · CPC title