Mechanism for vibration isolation of passenger car air conditioner compressor assembly and belt stable operation

Abstract

The invention discloses a mechanism for vibration isolation of a passenger car air conditioner compressor assembly and belt stable operation. The mechanism comprises a power assembly, the compressor assembly and a car body girder; a first connection rod is installed between the power assembly and the compressor assembly and arranged in the direction of the center-to-center distance of an engine belt pulley and a transition belt pulley; a second connection rod is installed between the left side of the bottom of the compressor assembly and the car body girder, and a damping spring is installed between the right side of the bottom of the compressor assembly and the car body girder; and the second connection rod points to the center point of the transition belt pulley and is arranged in the direction perpendicular to the first connection rod. The mechanism can meet the requirement for vibration isolation of the passenger car condition compressor assembly and can also meet the requirements for belt tension and belt operation, thus, all structures of a passenger car can operate very stably, and the comfort of the passenger car is improved.

Description

technical field [0001] The invention relates to the field of passenger car manufacturing, and more specifically relates to a mechanism for vibration isolation and belt stable operation of a passenger car air-conditioning compressor assembly. Background technique [0002] The air-conditioning compressor assembly of most passenger cars is generally driven by the driving device such as the engine. The compressor assembly and the engine are installed on the body frame after vibration isolation through suspension. Relative movement, therefore, the center distance will inevitably change, and the change of center distance will excite the belt, which often makes the belt vibrate greatly, especially in the engine speed range, the natural frequency of the belt lateral vibration is the same as that of the engine 1. The excitation coupling of the compressor will resonate several times. The test found that the amplitude of the belt can reach tens of millimeters during the resonance. The ...

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Problems solved by technology

[0004] Disadvantages of the existing passenger car structure: ① Due to the need to maintain flatness between the pulleys, it is not desirable to allow the compressor assembly to swing. Based on stability considerations, the stiffness of the ring-shaped rubber pad is only designed to be very large, so that the deformation displacement Very small, almost rigid, unable to produce vibration isolation effect, or even amplify the vibration; ②The main function of the vibration damping spring here is to provide belt tension, not to isolate vibration, because the powertrain and compressor assembly are mounted through their respective Installed on the body girder, the vibration will cause displacement during operation, which will inevitably change the length of the belt; ③In this structure, the compressor assembly rotates around the rotating shaft, and this movement has components in the belt length direction and the transverse excitation direction , it is easy to excite the belt and cause the belt to vibrate; ④The belt has a force of 2360N during installation. This force exists between the powertrain and the compressor assembly. For the powertrain alone, if it is not balanced, it will Applying it in one direction will have adverse effects on the powertrain suspension system, including the reduction of suspension vibration isolation, the reduction of the suspension limit clearance, and even the limit block. Once it touches the limit block, the vibration of the engine will pass without attenuation

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