Kurashiki Kako Co., Ltd.

Kabushiki Kako Co., Ltd.

Tetsuya Miyake

Katsutoshi Ohta

Sumio Uchida

Minoru Katayama

Takashi Moriya

Yoshinori Fujinami

In an abnormal noise inspection method for an anti-vibration device for vehicle use, it is determined whether, during travel of a vehicle in which a supported member is supported to the vehicle body by an anti-vibration device, abnormal noise occurs or not in the passenger compartment owing to the anti-vibration device. The method includes: an input step of mounting to a shaker the anti-vibration device before it is assembled into the vehicle and then inputting vibrations in a predetermined pattern to a supported member-side mounting part of the anti-vibration device; a measurement step of measuring, during the inputting of vibrations, a transmission force output from a vehicle body-side mounting part of the anti-vibration device; an analysis step of frequency analyzing time-series data on the measured transmission force to obtain a power spectrum of the transmission force; and a determination step of estimating, based on the power spectrum of the transmission force and according to a predetermined evaluation criterion, whether a vehicle produces abnormal noise in the passenger compartment when it runs with the anti-vibration device mounted thereon.

Abnormal noise inspection method for anti-vibration device for vehicle use

An oscillation limiting mechanismis integrally provided to an engine mount(a vibration proof mount device) of a power plant P mounted on an automobile in a traverse mount fashion. Not only is a stopper metal memberin the shape of an inverted U letter disposed so as to cross over a mount body portionbut a stopper rubberis formed so that it protrudes from the rear end of a casing of the mount body portiontoward the rear side of the vehicle body. Not only is a hollow portionformed in the interior of the stopper rubberbut a metal core bodyis also embedded in the stopper rubberso as to be revolvable around an axis in the vehicle body traverse direction as if it were a link. With such a construction adopted, the stopper rubberis shear-deformed in the vertical direction with comparative ease even in a state where it is brought into contact with the rear side leg portionof a stopper metal memberand thereby receives a compressive force in the vehicle body longitudinal direction, and a dynamic spring constant of the mountin the vertical direction does not rise so much even if the stopper acts in rapid acceleration or the like; therefore, enabling increase in surrounding sound in acceleration to be suppressed with a simple structure less of cost up while oscillation of the power plant P is limited in a similar way to that of a torque rod.

Vibration isolating proof device

An oscillation limiting mechanism () is integrally provided to an engine mount () (a vibration proof mount device) of a power plant (P) mounted on an automobile in a traverse mount fashion. Not only is a stopper metal member () in the shape of an inverted U letter disposed so as to cross over a mount body portion (), but a stopper rubber () is formed so that it protrudes from the rear end of a casing of the mount body portion () toward the rear side of the vehicle body. Not only is a hollow portion () formed in the interior of the stopper rubber (), but a metal core body () is also embedded in the stopper rubber () so as to be revolvable around an axis in the vehicle body traverse direction as if it were a link. With such a construction adopted, the stopper rubber () is shear-deformed in the vertical direction with comparative ease even in a state where it is brought into contact with the rear side leg portion () of a stopper metal member () and thereby receives a compressive force in the vehicle body longitudinal direction, and a dynamic spring constant of the mount () in the vertical direction does not rise so much even if the stopper acts in rapid acceleration or the like; therefore, enabling increase in surrounding sound in acceleration to be suppressed with a simple structure less of cost up while oscillation of the power plant (P) is limited in a similar way to that of a torque rod.

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Okayama, Japan

Tetsuya Miyake