Self-propelled construction machine

A self-propelled construction machine comprising:

• a machine frame;
• an operating drum supported from the frame;
• a drum housing surrounding the operating drum the drum housing including at least one sealing element for closing the drum housing off to a ground surface;
• an actuator configured to raise and lower the at least one sealing element the actuator being configured so that the at least one sealing element contacts the ground surface with a predetermined contact force when the sealing element is not raised;
• a sensor configured to detect a force acting on the at least one sealing element when the at least one sealing element encounters an obstacle;
• and
• a control unit operatively connected to the sensor and the actuator and configured to generate a first control signal such that the actuator raises the at least one sealing element when the force detected by the sensor is greater than a predetermined limit value;
• wherein the at least one sealing element comprises a lower edge and at least one impact element extending downwards past the lower edge;
• and
• wherein the at least one impact element includes an upper part connected to the at least one sealing element under a spring preload so that on striking an obstacle the at least one impact element is displaced against the spring preload from a first position, in which the upper part of the at least one impact element is in contact with the at least one sealing element, to a second position in which the upper part of the at least one impact element is spaced from the at least one sealing element.

A self-propelled construction machine, comprising:

• a machine frame;
• an operating drum supported from the frame;
• a drum housing surrounding the operating drum, the drum housing including at least one sealing element for closing the drum housing off to a ground surface;
• an actuator configured to raise and lower the at least one sealing element the actuator being configured so that the at least one sealing element contacts the ground surface with a predetermined contact force when the sealing element is not raised;
• a sensor configured to detect a force acting on the at least one sealing element when the at least one sealing element encounters an obstacle;
• and
• a control unit operatively connected to the sensor and the actuator and configured to generate a first control signal such that the actuator raises the at least one sealing element when the force detected by the sensor is greater than a predetermined limit value;
• wherein the at least one sealing element comprises a lower edge and at least one impact element extending downwards past the lower edge;
• and
• further comprising:
• at least one hole defined in the at least one impact element;
• and
• at least one guide pin attached to the at least one sealing element and extending through the at least one hole in the at least one impact element;
• an external thread defined on the at least one guide pin;
• a threaded nut threaded on the external thread of the at least one guide pin to hold the at least one impact element on the at least one guide pin;
• and
• a spring positioned between the nut and the at least one impact element.

A self-propelled construction machine, comprising:

• a machine frame;
• an operating drum supported from the frame;
• a drum housing surrounding the operating drum the drum housing including at least one sealing element for closing the drum housing off to a ground surface;
• an actuator configured to raise and lower the at least one sealing element the actuator being configured so that the at least one sealing element contacts the ground surface with a predetermined contact force when the sealing element is not raised;
• a sensor configured to detect a force acting on the at least one sealing element when the at least one sealing element encounters an obstacle;
• and
• a control unit operatively connected to the sensor and the actuator and configured to generate a first control signal such that the actuator raises the at least one sealing element when the force detected by the sensor is greater than a predetermined limit value;
• wherein:
• the at least one sealing element comprises a lower edge and at least one impact element extending downwards past the lower edge;
• the at least one sensor is configured to detect a position of the at least one impact element;
• and
• the at least one sensor comprises a distance sensor configured to detect a distance between the at least one sealing element and the at least one impact element.

A self-propelled construction machine, comprising:

• a machine frame;
• an operating drum supported from the frame;
• a drum housing surrounding the operating drum the drum housing including at least one sealing element for closing the drum housing off to a ground surface;
• an actuator configured to raise and lower the at least one sealing element the actuator being configured so that the at least one sealing element contacts the ground surface with a predetermined contact force when the sealing element is not raised;
• a sensor configured to detect a force acting on the at least one sealing element when the at least one sealing element encounters an obstacle;
• and
• a control unit operatively connected to the sensor and the actuator and configured to generate a first control signal such that the actuator raises the at least one sealing element when the force detected by the sensor is greater than a predetermined limit value;
• wherein:
• the at least one sealing element comprises first and second rear sealing elements positioned behind the operating drum in relation to an operating direction of the construction machine;
• and
• the actuator comprises first and second actuators configured to raise and lower the first and second rear sealing elements, respectively, the first and second actuators operating independently of each other.