Vibratory eccentric assemblies for compaction machines

A compaction machine comprising:

• a chassis;
• a hollow drum rotatably connected to the chassis to allow rotation of the drum over a work surface;
• an eccentric assembly mounted inside the drum, wherein the eccentric assembly includes,
• an outer eccentric mass with a length in a direction of an axis of rotation of the outer eccentric mass,
• a first inner eccentric mass rotatably connected to the outer eccentric mass by a first joint, and
• a second inner eccentric mass rotatably connected to the outer eccentric mass by a second joint, wherein the first and second inner eccentric masses are separate, and wherein the first and second joints are separate;
• and
• a vibration motor coupled to the eccentric assembly, wherein the vibration motor is configured to rotate the outer eccentric mass in a first direction about the axis of rotation of the outer eccentric mass so that the first and second inner eccentric masses move to respective first positions relative to the outer eccentric mass to provide high amplitude vibration, and wherein the vibration motor is configured to rotate the outer eccentric mass in a second direction about the axis of rotation of the outer eccentric mass so that the first and second inner eccentric masses move to respective second positions relative to the outer eccentric mass to provide low amplitude vibration.