Kurashiki Kako Co., Ltd.

Kabushiki Kako Co., Ltd.

Katsutoshi Ohta

Sumio Uchida

Tetsuya Miyake

Minoru Katayama

Yoshinori Fujinami

Yoshiharu Yamamoto

Takashi Moriya

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

In a liquid-filled anti-vibration mounting device suitable such as for an engine mount, an accommodation room containing a rubber movable plate is formed inside a partition member partitioning a liquid chamber into a pressure receiving chamber and a balancing chamber. The partition member includes a pair of division walls, one adjoining the pressure receiving chamber and the other adjoining the balancing chamber. Each division wall is formed with a plurality of communication holes. The communication holes are arranged to undulate at least a portion of the movable plate towards the peripheral edge thereof at specified circumferential intervals or greater by the action of the liquid pressure through the communication holes. The movable plate thus deformed, particularly its portion towards the peripheral edge, has a small area to come into contact with the division walls at a time, which effectively disperses and lessens a shock due to contact.

Liquid-filled anti-vibration mounting device

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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Kurashiki, Japan

Katsutoshi Ohta