Kurashiki Kako Co., Ltd.

Kabushiki Kaisha Toyota Jidoshokki

Sumio Uchida

Katsutoshi Ohta

Tetsuya Miyake

Hidehito Kondo

Minoru Katayama

Kazuo Miyake

Yoshinori Kondo

Yoshiharu Yamamoto

A vibration isolator includes: a pair of opposing members fixed to a vehicle body of the vehicle to be located on both sides of a protrusion protruding from an outer circumferential edge of the power train in a direction perpendicular to the principal axes of inertia to oppose to each other in the direction about the principal axes of inertia; a precompressed part provided on part of each of the opposing members facing the protrusion to be precompressed by the opposing member and the protrusion in the direction about the principal axes of inertia; and a contacting part provided on part of each of the opposing members facing the protrusion to be spaced from the protrusion, and contacts the protrusion when the power train vibrates in the direction about the principal axes of inertia.

Vibration isolator

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

Sumio Uchida