Assembly for vibrating a compacting drum of a compacting machine

Patent metadata

Field	Value
Publication number	US-2016102438-A1
Application number	US-201314785342-A
Country	US
Kind code	A1
Filing date	Apr 25, 2013
Priority date	Apr 25, 2013
Publication date	Apr 14, 2016
Grant date	—

Abstract

An assembly is provided for vibrating a compacting drum of a compacting machine. The assembly includes a shaft rotatably mountable to a compacting drum of the compacting machine. The centre of mass of the shaft is offset from the geometrical rotation axis of the shaft. An outer eccentric member is arranged outside of the shaft, wherein the centre of mass of the outer eccentric member is offset from the geometrical rotation axis of the shaft. The outer eccentric member is displaceably mounted relative to the shaft for adjustment of the eccentricity of the assembly. An extension of the outer eccentric member in a direction parallel with the geometrical rotation axis of the shaft is at least two times an average extension of the outer eccentric member in a radial direction perpendicular to the geometrical rotation axis of shaft such that a mass of the outer eccentric member forms a distributed load along the geometrical rotation axis of the shaft.

First claim

1 . An assembly for vibrating a compacting drum of a compacting machine, the assembly comprising, a shaft rotatably mountable to a compacting drum of the compacting machine, the centre of mass of the shaft being offset from the geometrical rotation axis of the shaft, and an outer eccentric member arranged outside of the shaft, the centre of mass of the outer eccentric member being offset from the geometrical rotation axis of the shaft, and the outer eccentric member being displaceably mounted relative to the shaft for adjustment of the eccentricity of the assembly, wherein an extension of the outer eccentric member in a direction parallel with the geometrical rotation axis of the shaft is at least two times an average extension of the outer eccentric member in a radial direction perpendicular to the geometrical rotation axis of the shaft, such that a mass of the outer eccentric member forms a distributed load along the geometrical rotation axis of the shaft.

2 . An assembly according to claim 1 , wherein the extension of the outer eccentric member in the direction parallel with the geometrical rotation axis of the shaft is at least three times, preferably at least five times, and more preferably at least ten times the average extension of the outer eccentric member in the radial direction perpendicular to the geometrical rotation axis of the shaft.

3 . An assembly according to claim 1 , wherein the outer eccentric member has an extension in the direction parallel with the geometrical rotation axis of the shaft exceeding 10%, preferably exceeding 20%, and more preferably exceeding 50% of an unsupported length of the shaft.

4 . An assembly according to claim 1 , wherein the outer eccentric member has an extension in the direction parallel with the geometrical rotation axis of the shaft exceeding 10%, preferably exceeding 20%, and more preferably exceeding 50% of the length of an eccentric mass of the shaft.

5 . An assembly according to claim 1 , wherein the outer eccentric member being pivotally mounted relative to the shaft.

6 . The assembly according to claim 1 , wherein the outer eccentric member exhibits an axial length of at least 100 millimetres, preferably at least 150 millimetres, and more preferably at least 200 millimetres.

7 . The assembly according to claim 1 , wherein the mass of any axial segment of an unsupported axial length of the outer eccentric member differs less than 75% from the mass of any other axial segment of the unsupported axial length of the outer eccentric member with the same axial length, preferably less than 50%, and more preferably less than 40%.

8 . The assembly according claim 1 , wherein the mass of an unsupported axial length of the outer eccentric member is substantially regularly distributed over the unsupported axial length of the outer eccentric member.

9 . The assembly according to claim 1 , wherein the outer eccentric member is attached to the shaft means of at least two support members, the at least two support members being spaced apart in a direction of the geometrical rotation axis of the shaft and pivotally mounted on the exterior of the shaft.

10 . The assembly according to claim 9 , wherein each support member is formed as an individual member that connects the outer eccentric member with the shaft.

11 . The assembly according, to claim 9 , wherein one support member is positioned on each side of an eccentric mass of the shaft.

12 . The assembly according to claim 1 , wherein the outer eccentric member is rotatable relative to the shaft in an angular range that is limited by a first end position at a first end of the range and a second end position at a second end of the range, which angular range is less than 360 degrees, preferably less than 180 degrees.

13 . The assembly according to claim 1 , wherein the total centre of mass of the shaft and the outer eccentric member is offset from the geometrical rotation axis of the shaft with a first distance when the outer eccentric member is located in a first end position, and the total centre of mass of the shaft and the outer eccentric member is offset from the geometrical rotation axis of the shaft with a second distance when the outer eccentric member is located in a second end position, wherein the first and second distances are different.

14 . The assembly according to claim 1 , wherein the shaft comprises a first stop arrangement for preventing relative rotation between the shaft and the outer eccentric member in a first angular direction at a first end position, and a second stop arrangement for preventing relative rotation between the shaft and the outer eccentric member in a second angular direction, opposite to the first angular direction at the second end position.

15 . The assembly according to claim 1 , wherein the assembly comprises spring means for damping an impact force that, may be generated when the outer eccentric member reaches the first end position and/or the second end position.

16 . The assembly according to claim 15 , wherein the spring means is arranged on the outer eccentric member.

17 . The assembly according to claim 16 , wherein the spring means 44 is arranged at the end regions of the outer eccentric member.

18 . The assembly according to claim 15 , wherein the spring means is arranged on the shaft.

19 . The assembly according to claim 18 , wherein the spring means is arranged at the end regions of the shaft.

20 . The assembly according to claim 15 , wherein the assembly comprises spring means for damping an impact force that may be generated when the at least two support members are brought into contact with the shaft at the first end position and/or the second end position, wherein the spring means is arranged on one or more of the at least two support members.

21 . The assembly according to claim 15 , wherein the spring means comprises at least one spring member in form of helical spring, disc spring, spring washer, elastic member, or the like.

22 . The assembly according to claim 15 , wherein the spring means additionally comprises at least one abutment member arranged to transfer the impact force to the spring member.

23 . The assembly according to claim 22 , wherein the at least one abutment member cooperates with guiding means for guiding the at least one abutment member along a path, wherein the guiding means preferably is formed of at least one recess in which the at least one abutment member is at least partly positioned.

24 . The assembly according to claim 21 , wherein the at least one spring member is preloaded.

25 . The assembly according to claim 23 , wherein the at least one recess is a through-hole, a first abutment member is arranged at a first end of the through-hole, a second abutment member is arranged at a second end of the through-hole, and the spring member is arranged between the first and second abutment member.

26 . The assembly according to claim 15 , wherein the spring means is positioned in a central region of the outer eccentric member and/or the shaft.

27 . The assembly according to claim 1 , wherein the outer eccentric member is constituted by at least one leaf spring and the shaft comprises at least one projecting abutment member positioned in a central region of the shaft, and the leaf spring is arranged to interact with the projecting abutment member for damping the impact force.

Assignees

• Volvo Constr Equip Ab

Inventors

• Kreische Michael

Classifications

• 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

• B06B1/162

  Making use of masses with adjustable amount of eccentricity · CPC title

• E02D3/074

  Vibrating apparatus operating with systems involving rotary unbalanced masses (E02D3/054 takes precedence) · CPC title

• F16C3/28

  Adjustable cranks or eccentrics · CPC title