Noise reducing resonator in a surface compaction machine

Patent metadata

Field	Value
Publication number	US-12305342-B2
Application number	US-201917770496-A
Country	US
Kind code	B2
Filing date	Oct 22, 2019
Priority date	Oct 22, 2019
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A resonator assembly for a surface compaction machine comprising a resonator housing ( 36 ) defining an internal cavity, the resonator housing comprising a first head plate ( 242 ) comprising a plurality of first cutouts ( 44 ); and a plurality of first extension tubes ( 246 ), wherein each first extension tube of the plurality of first extension tubes is coupled to the first head plate around a corresponding first cutout, wherein each first cutout forms an acoustic passage between the internal cavity and an exterior of the resonator housing to attenuate sound around the internal cavity.

First claim

The invention claimed is:

1. A resonator assembly for a surface compaction machine comprising:
a resonator housing defining an internal cavity, the resonator housing comprising a first head plate comprising a plurality of first cutouts and a second head plat opposite the first head plat, the second head plate comprising a plurality of second cutouts; and
a plurality of first extension tubes, each first extension tube of the plurality of first extension tubes coupled to the first head plate around a corresponding first cutout,
each first cutout forming an acoustic passage between the internal cavity and an exterior of the resonator housing to attenuate sound around the internal cavity;
a drum housing comprising a substantially cylindrical compaction surface surrounding the first head plate and the second head plate, the internal cavity comprising a substantially cylindrical cavity defined by the first head plate, the second head plate, and the drum housing; and
an eccentric vibration system housing for enclosing an eccentric vibration system, the internal cavity surrounding the eccentric vibration system.

2. The resonator assembly of claim 1 , wherein the resonator housing further comprises:
a plurality of second extension tubes, each second extension tube of the plurality of second extension tubes coupled to the second head plate around a corresponding second cutout.

3. The resonator assembly of claim 1 , wherein at least two first cutouts of the plurality of first cutouts have different sizes.

4. The resonator assembly of claim 3 , wherein each first extension tube of the plurality of first extension tubes has a cross-sectional area substantially equal to the size of the first cutout corresponding to the first extension tube.

5. The resonator assembly of claim 1 , wherein at least two first extension tubes of the plurality of first extension tubes have different lengths.

6. The resonator assembly of claim 1 , wherein a first subset of the plurality of first extension tubes extends into the internal cavity in a first direction, and
wherein a second subset of the plurality of first extension tubes extends away from the internal cavity in a second direction.

7. The resonator assembly of claim 1 , wherein the first head plate comprises:
a non-removable structural plate coupled to the resonator housing; and
a removable cover plate removably coupled to the structural plate.

8. The resonator assembly of claim 7 , wherein each first cutout comprises:
a structural plate cutout; and
a corresponding cover plate cutout that is smaller than the structural plate cutout,
wherein each first extension tube has a cross sectional area that is substantially coincident with the cover plate cutout corresponding to the first extension tube.

9. The resonator assembly of claim 8 , wherein each first extension tube of the plurality of first extension tubes is coupled to the cover plate around the cover plate cutout corresponding to first extension tube.

10. The resonator of claim 7 , wherein the removable cover plate comprises a plurality of removable cover plates, and
wherein each removable cover plate is removably coupled to the structural plate around a corresponding structural plate cutout.

11. The resonator assembly of claim 1 , wherein the internal cavity, the first cutouts and the first extension tubes are sized to attenuate sound in one or more predetermined frequency ranges.

12. The resonator assembly of claim 11 , wherein the predetermined frequency range is between 30 Hz and 80 Hz.

13. A drum assembly for a surface compaction machine comprising:
a substantially cylindrical drum housing comprising an external compaction surface and an internal surface opposite the external compaction surface;
a first head plate coupled to the internal surface of the drum housing;
a second head plate coupled to the internal surface of the drum housing;
an eccentric vibration system housing coupled between the first head plate and the second head plate, wherein the compaction surface, the first head plate, the second head plate, and the eccentric vibration system housing form a substantially annular internal resonator cavity;
a plurality of cutouts in the first head plate and the second head plate; and
a plurality of extension tubes coupled to the first head plate and the second head plate, wherein each extension tube is coupled around a corresponding cutout to form an acoustic passage between the internal resonator cavity to attenuate sound around the internal resonator cavity.

14. The drum assembly of claim 13 , wherein at least two cutouts of the plurality of cutouts have different sizes.

15. The drum assembly of claim 14 , wherein each extension tube of the plurality of extension tubes has a cross-sectional area substantially equal to the size of the cutout corresponding to the extension tube.

16. The drum assembly of claim 13 , wherein at least two extension tubes of the plurality of extension tubes have different lengths.

17. The drum assembly of claim 13 , wherein a first subset of the plurality of extension tubes extends into the internal cavity, and
wherein a second subset of the plurality of extension tubes extends away from the internal cavity.

18. The drum assembly of claim 13 , wherein the first head plate comprises:
a non-removable first structural plate coupled to the drum housing and the eccentric vibration system housing; and
a removable first cover plate removably coupled to the first structural plate, and wherein the second head plate comprises:
a non-removable second structural plate coupled to the drum housing and the eccentric vibration system housing; and
a removable second cover plate removably coupled to the second structural plate.

19. The drum assembly of claim 13 , wherein the internal resonator cavity, the cutouts and the extension tubes are sized to attenuate sound in one or more predetermined frequency ranges.

20. The drum assembly of claim 17 , wherein the predetermined frequency range is between 30 Hz and 80 Hz.

Assignees

• Volvo Constr Equip Ab

Inventors

• Xu Hongan
• Clark David

Classifications

• F01N1/02

  by using resonance · CPC title

• E01C19/28

  Vibrated rollers or rollers subjected to impacts, e.g. hammering blows ({E01C19/235, } E01C19/29, {E01C19/41} take precedence; {combined with non-vibrated elastically-deformable rolling elements E01C19/233}) · CPC title

• E01C19/286 Primary

  Vibration or impact-imparting means; Arrangement, mounting or adjustment thereof; Construction or mounting of the rolling elements, transmission or drive thereto, e.g. to vibrator mounted inside the roll (E01C19/287 and E01C19/288 take precedence) · CPC title