US 5,618,133 A · Vibrating mechanism and apparatus for generating vibrations for a vibration compacting roller with variable amplitude

Abstract

A vibrating mechanism for vibrating a vibration compacting roller with a variable amplitude includes a vibration generating shaft, a movable eccentric weight turnably disposed in the vibration generating shaft, and an eccentric weight driving unit for rotating the eccentric weight about a pivotal shaft transversely extending relative to the vibration generating shaft. To generate vibrations for the vibration compacting roller, a vibration generating apparatus including a vibrating mechanism of the foregoing type is substantially composed of an eccentricity signal generating unit, a vibration mode setting unit, an eccentric weight eccentricity quantity detecting unit, and an eccentric weight eccentricity quantity controlling unit. Alternatively, the vibration generating apparatus may substantially be composed of a forward/rearward movement lever neutral position detecting unit and an eccentric weight eccentricity quantity controlling unit. Otherwise, the vibration generating apparatus may substantially be composed of a running speed detecting unit, a running speed setting unit a running speed comparing unit, and an eccentric weight eccentricity quantity controlling unit. The eccentric weight eccentricity quantity controlling unit is usually composed of a hydraulic cylinder, a hydraulic pump, a connecting rod, and solenoid driven change valves. In addition, a vibration generating method to be practiced by operating a vibration generating apparatus of the foregoing type is also provided.

Claims11

Dependent claims

A vibrating mechanism which rotates a vibration generating shaft including a moveable eccentric weight to generate a centrifugal force, wherein said vibrating mechanism comprises:

a vibration generating shaft including a pair of supporting members disposed in a parallel spaced relationship while facing each other,
a moveable eccentric weight turnably supported on a pivotal shaft, said pivotal shaft being supported by the pair of supporting members in a direction orienting said pivotal shaft at a right angle relative to a center axis of said vibration generating shaft;
said pivotal shaft extending between the pair of supporting members, and
an eccentric weight driving means for turning said moveable eccentric weight about said pivotal shaft, and said eccentric weight driving means serving to deviate the gravity center of said eccentric weight away from the center axis of said vibration generating shaft, wherein said eccentric weight driving means is composed of an actuator, an actuating rod projecting outside of said actuator, a joint rotatably fitted to said actuating rod, and a connecting rod, one end of said connecting rod being operatively connected to said joint and another end of said connecting rod being operatively connected to said moveable eccentric weight, said connecting rod serving to transform a linear movement of the joint away from said actuator into a turning movement of said eccentric weight about said pivotal shaft.

1 more element

An apparatus for generating vibrations for a vibration compacting roller with a variable amplitude comprising:

a vibration generating shaft having a center axis;
a moveable eccentric weight having a gravity center disposed in said vibration generating shaft away from said center axis therefrom;
a vibration mechanism capable of changing an amplitude of each vibration to another one by deviating said gravity center of said moveable eccentric weight in said vibration generating shaft away from said center axis therefrom;
an eccentricity signal generating means for generating a signal for deviating the gravity center of said eccentric weight away from said center axis of said vibration generating shaft,
a vibration mode setting means capable of selectively setting an amplitude of each vibration to a desired amplitude,
an eccentric weight eccentricity quantity detecting means for detecting a quantity of eccentricity of said eccentric weight, and
an eccentric weight eccentricity quantity controlling means for controlling a quantity of eccentricity of said eccentric weight with the aid of said vibration mode setting means for selectively setting a desired vibration mode as well as said eccentric weight eccentricity quantity detecting means in response to a signal transmitted from said eccentricity signal generating means.

4 more elements

An apparatus for generating vibrations for a vibration compacting roller with a variable amplitude comprising:

a vibration generating shaft having a center axis;
a moveable eccentric weight having a gravity center disposed in said vibration generating shaft away from said center axis therefrom;
a vibration mechanism capable of changing an amplitude of each vibration to another one by deviating said gravity center of said moveable eccentric weight in said vibration generating shaft away from said center axis;
a running speed setting means, for setting a running speed of said vibration compacting roller;
a running speed detecting means for detecting said running speed of said vibration compacting roller detected by said running speed detecting means with a running speed of said vibration compacting roller set by said running speed setting means by comparing a signal transmitted from said running speed detecting means with a signal transmitted from said running speed setting means in order to determine whether or not said running speed of said vibration compacting roller detected by said running speed detecting means is higher than said running speed of said vibration compacting roller set by said running speed setting means;
and
an eccentric weight eccentricity quantity controlling means for locating said gravity center of said eccentric weight substantially on said center axis of said vibration generating shaft in response to a signal transmitted from said running speed detecting means when a running speed of said vibration compacting roller detected by said running speed detecting means is lower than a running speed of said vibration compacting roller set by said running speed setting means, and deviating said gravity center of said eccentric weight away from said center axis of said vibration generating shaft in response to the foregoing signal when said running speed of said vibration compacting roller detected by said running speed detecting means is higher than said running speed of said vibration compacting roller set by said running speed setting means.

4 more elements

Dependencies are inferred from the claim text.

Vibrating mechanism and apparatus for generating vibrations for a vibration compacting roller with variable amplitude

Life of this patent

Vibrating mechanism and apparatus for generating vibrations for a vibration compacting roller with variable amplitude

Life of this patent

Abstract

Claims11