Boge Gmbh

Arno Hamaekers

Heinz Brenner

Elastic rubber engine mounts with hydraulic damping are provided, especially for engine suspensions in motor vehicles. The mounts comprise two separated liquid-filled chambers, defined in part by elastic rubber-like peripheral walls adheringly connected with end walls and with a centrally disposed supporting element for connection to an engine supporting frame. The liquid chambers are separated by an elastic rubber-like partition connected with the supporting element, and flow connection between the two chambers is provided by perforations or choke openings in the partition. The rigid end walls of the two chambers are rigidly interconnected. Arrangements are provided for minimizing or avoiding hydraulic damping of oscillations of low amplitude and high frequency, while providing hydraulic damping for oscillations of large amplitude and low frequency. This is achieved by limited compensation of volume changes in the chambers, through either axially reciprocable annular members disposed in the partition and axially movable relative to the support element, or by flexible wall parts in the rigid end walls. The flexible wall parts may be in the form of diaphragms, and the diaphragms may advantageously be of foamed material. Hydraulic damping thus occurs only upon oscillations of predetermined amplitude and frequency.

Rubber elastic engine mounts or supports with hydraulic damping,

Elastic rubber engine mounts with hydraulic damping are provided, especially for engine suspensions in motor vehicles. The mounts comprise two separated liquid-filled chambers, defined in part by elastic rubber-like peripheral walls adheringly connected with end walls and with a centrally disposed supporting element for connection to an engine supporting frame. The liquid chambers are separated by an elastic rubber-like partition connected with the supporting element, and flow connection between the two chambers is provided by perforations or choke openings in the partition. The rigid end walls of the two chambers are ridgidly interconnected. Arrangements are provided for minimizing or avoiding hydraulic damping of oscillations of low amplitude and high frequency, while providing hydraulic damping for oscillations of large amplitude and low frequency. This is achieved by limited compensation of volume changes in the chambers, through either axially reciprocable annular members disposed in the partition and axially movable relative to the support element, or by flexible wall parts in the rigid end walls. The flexible wall parts may be in the form of diaphragms, and the diaphragms may advantageously be of foamed material. Hydraulic damping thus occurs only upon oscillations of predetermined amplitude and frequency.

Rubber elastic engine mounts or supports with hydraulic damping

A rubber elastic engine mount with hydraulic damping, especially for motor vehicles, includes an elastic peripheral wall on the engine side joined with a metallic end wall that can be connected with an engine casing, and joined also with a metallic supporting element that can be connected to an engine supporting frame. The elastic wall together with the end walls forms a liquid-filled main chamber which is closed off by a partition connected with the supporting element, and which is connected with an auxiliary liquid-filled elastic walled chamber on the other side of the partition. The auxiliary chamber may be constructed generally the same as the main chamber, including an elastic peripheral wall joined with the supporting element and with a metallic end wall relatively away from the engine. The two end walls are rigidly connected. The peripheral walls function as thrust springs. The partition may be rigid and stationary, or it may be movable. A foamed material may be disposed in the chambers so as to accommodate low amplitude oscillations without any appreciable hydraulic damping. One or both of the end walls may be double-walled, including an outer fixed wall and an inner diaphragm-like yieldable wall, the inner wall being constructed with a predetermined yieldability so as to accommodate high frequency oscillations of low amplitude without any appreciable hydraulic damping.

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Ahrweiler, Germany

Arno Hamaekers