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The purposeo f this study is to clarify the transmittancec haracteristics of vibration energy from the exciting force due to the pressure variation in the cylinder to the casing vibration through various components inside the pump, and to find countermeasures to reduce the vibration energy during the transmittance process. This is in additionto the formera ccepted measure of machining a relief groove in the valve plate. An experimental investigation was carried out using a swash plate type axial piston pump. The pressure in the cylinder, the vibration acceleration of the main components, the distribution of the vibration acceleration on the casing surface and the noise adjacent to the casing surface were measured. The results presented in this study can be summarized as follows: (1) The dominant vibration frequencies are the piston frequency and its harmonics. (2) The vibrating system consisting of the swash plate and trunnion axis has the characteristics of a distributed parameter vibrating system. (3) The casing vibration is mainly transmitted through the trunnion axis. (4) The airborne noise spectrum (adjacent to the casing surface) corresponds closely with the spectrum of the casing vibration.

yuatsu to kūkiatsu/yuatsu to kukiatsu

Study on the noise generating mechanism of swash plate type axial piston pumps. 1st report Transmittance characteristics of vibrating energy in main components.