Infinitely variable eccentric device for vibratory compactor

Patent metadata

Field	Value
Publication number	US-9970163-B2
Application number	US-201415520190-A
Country	US
Kind code	B2
Filing date	Dec 1, 2014
Priority date	Dec 1, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A vibratory compactor that generates vibrations by rotation of eccentric masses is provided, which includes an inner eccentric rod positioned inside a roller drum of the vibratory compactor and provided with a rack formed on one side of the inner eccentric rod, a pinion engaged with the rack, a variable eccentric weight engaged with the pinion so that a distance between the variable eccentric weight and a rotation axis of the inner eccentric rod is changed as the pinion is rotated, and an outer eccentric tube including a hole formed thereon to guide movement of the rack back and forth and a support fixture formed thereon to fix a shaft of the pinion so that the pinion is rotated in engagement with the rack, wherein when the inner eccentric rod moves back and forth, the pinion that is engaged with the rack is rotated as much as the movement of the rack, and as a position of the variable eccentric weight is changed, an amplitude of vibration of the roller drum is changed.

First claim

The invention claimed is:

1. A vibratory compactor that generates vibrations by rotation of eccentric masses, comprising:
an inner eccentric rod positioned inside a roller drum of the vibratory compactor and provided with a rack formed on one side of the inner eccentric rod;
a pinion engaged with the rack;
a variable eccentric weight engaged with the pinion so that a distance between the variable eccentric weight and a rotation axis of the inner eccentric rod is changed as the pinion is rotated; and
an outer eccentric tube including a hole for guiding movement of the rack back and forth and a support fixture for fixing a shaft of the pinion so that the pinion is rotated in engagement with the rack,
wherein when the inner eccentric rod moves back and forth, the pinion that is engaged with the rack is rotated as much as the movement of the rack, and as a position of the variable eccentric weight is changed, an amplitude of vibration of the roller drum is changed.

2. The vibratory compactor according to claim 1 , wherein the variable eccentric weight is integrally formed with the pinion.

3. The vibratory compactor according to claim 1 , wherein the inner eccentric rod moves back and forth using any one of an electromagnetic field, an electric actuator, and a hydraulic actuator.

4. The vibratory compactor according to claim 1 , wherein a plurality of racks of the inner eccentric rod, a plurality of variable eccentric weights, and a plurality of holes of the outer eccentric tube are provided.

5. The vibratory compactor according to claim 1 , wherein the variable eccentric weight comprises a lower end portion that is composed of a connection portion to the pinion and an upper end portion that is composed of a weight, and a weight center of the variable eccentric weight is positioned to be tilted toward the upper end portion.

6. The vibratory compactor according to claim 5 , wherein if the rack moves to maximally rotate the pinion, the variable eccentric weight is put to be most adjacent to the rotation axis of the inner eccentric rod.

7. The vibratory compactor according to claim 5 , wherein if the rack moves and the variable eccentric weight becomes at right angles to the inner eccentric rod, the weight center of the variable eccentric weight is positioned to be farthest apart from the rotation axis of the inner eccentric rod.

Assignees

• Volvo Constr Equip Ab

Inventors

• Magalski Edward

Classifications

• B06B1/162

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

• E01C19/281

  propelled by hand or by vehicles, e.g. towed (E01C19/285 - E01C19/288 take precedence) · 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

• E02D3/08 Primary

  by inserting stones or lost bodies, e.g. compaction piles (sand drains for soil compaction E02D3/10; stressing soil while forming foundations E02D27/28) · CPC title

• E02D3/074

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