Vibration damping system for power unit
AssigneeNissan Motor Co., Ltd.
InventorShin Takehara
Life of this patent
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Abstract
A damper of a vibration damping system is installed to connect a power unit and a vehicle body and disposed independent from power unit mount devices. The damper is positioned in the direction of a tangent line of the direction of roll of the power unit. The damper consists of an elastomeric wall member defining a first fluid chamber and connected to the power unit, and an elastomeric diaphragm member defining a second fluid chamber which is communicated through a communication passage with the first fluid chamber. A liquid is filled in the first and second fluid chambers and the communication passage. The volume of the communication passage is changed in response to engine speed of the power unit, thereby effectively damping vibrations of the power unit in roll direction.
Claims22
A vibration damping system for a power unit of vehicle, said vibration damping system comprising:
- mounting devices for supporting a power unit from a vehicle body;
- a damper operatively disposed between the power unit and the vehicle body, said damper operatively disposed independently from said mounting devices so that said mounting devices receive the static load of the power unit, said damper including:
- a first connecting section connected to the power unit;
- a second connecting section connected to the vehicle body,
- a first elastic wall member connected to one of said first and second connecting sections and defining a first fluid chamber,
- a second elastic wall member defining a second fluid chamber,
- means for defining a communication passage through which said first and second fluid chambers are communicable with each other, and
- a fluid filled in said first and second fluid chambers and said communication passage;
- and
- means for changing volume of said communication passage in response to engine speed of the power unit.
A vibration damping system as claimed in claim 15, wherein said first connecting section includes first inner and outer cylinders disposed coaxially and spaced from each other, and a first rubber bushing securely disposed between said first inner and outer cylinders, said first outer cylinder being connected through a rod to said first elastic wall member, said first inner cylinder being connected to a bracket of said power unit.
A vibration damping system for a power unit supported through mounting device to a vehicle body, said vibration damping system comprising:
- a damper disposed indpendent from the mounting devices and located to connect the power unit and the vehicle body, said damper including:
- a first connecting section connected to the power unit,
- a second connecting section connected to the vehicle body,
- a first elastic wall member connected to one of said first and second connecting sections and defining a first fluid chamber,
- a second elastic wall member defining a second fluid chamber,
- means for defining a communication passage through which said first and second fluid chambers are communicable with each other, and
- a fluid filled in said first and second fluid chambers and said communication passage;
- and
- means for changing volume of said communication passage in response to engine speed of the power unit, said communication passage volume changing means including means for decreasing the volume of said communication passage in response to an engine speed indicative of idling as compared with in response to an engine speed indicative of normal vehicle cruising.
Dependencies are inferred from the claim text.