Engine mounting pad assembly

Abstract

The invention provides an engine mounting pad assembly. The assembly includes an upper installing plate assembly connected with an engine and a lower installing plate assembly connected to a vehicle frame. A rubber assembly is disposed between the upper installing plate assembly and the lower installing plate assembly. The rubber assembly includes a rubber body used for engine load and vibration reduction and a limit rubber block for limiting under extreme working conditions; the shore hardness of the rubber body is 40 degrees-60 degrees; and the shore hardness of the limit rubber block is more than 65 degrees. The engine mounting pad assembly has the advantages of a compact structure and effectively meeting requirements of support, limit and vibration isolation reduction.

Description

technical field [0001] The invention relates to the technical field of engine vibration reduction and isolation in motor vehicles, in particular to an engine suspension cushion assembly. Background technique [0002] At present, the automotive powertrain (engine + transmission) is usually installed on a suspension or a vibration isolator, and the suspension can be directly connected to the frame, or it can be placed on the sub-frame, and the sub-frame is passed through another suspension. Connect with the frame. During operation, if the vibration of the car powertrain cannot be effectively isolated, its vibration will be transmitted to various parts of the car to generate vibration and noise. When the vibration and noise reach the driver and passenger, their hearing and hearing will be seriously affected. comfort. [0003] The forces suffered by the engine in the working state mainly include static force (moment), transient and periodic excitation force (moment). In order ...

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Problems solved by technology

[0004] (1) Existing engine mounts usually use soft limiters. In the case of extreme load and large displacement, soft limiters cannot play an effective limiter role, and it is easy to cause interference between engine mounts and other components. The limit effect is poor; while using hard limit, the usual way is to vulcanize a thin layer of rubber on the metal surface, which has high cost, poor economy and heavy weight

[0005] (2) In order to achieve effective limit, the existing engine mount size needs to be designed very large, its structure is not compact, and the limit design is complicated;

[0006] (3) The thickness and volume of the rubber parts are large, and the heat dissipation is poor, and the heat generation of the rubber parts is serious, which greatly affects the fatigue life of the engine mount, resulting in a low mount life and high replacement frequency;

[0007] (4) According to the vibration isolation theory, in order to have a good vibration isolation effect, the ratio of the excitation frequency / natural frequency needs to be designed to be large, that is, the stiffness of the rubber body should be low, and the existing rubber parts have a certain size of the engine mount. It is difficult to meet the requirement of small stiffness under certain circumstances; in order to meet the requirement of stiffness, increasing the size of the engine mount will lead to problems such as poor product stability, easy shaking, and reduced supporting effect

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