In order to improve ride comfort, mounting system was required to effectively isolate the vibrations generated by the engine, preventing them from being transmitted to the vehicle body and the cabin, while ensuring that the displacement of the powertrain remains within controllable limits under various operating conditions. This study investigated the vibration isolation performance of single bell plate hydraulic mount in a quarter‑car model. Key parameters including force transmissibility and relative displacement transmissibility were analyzed under varying damping of the main rubber spring, different mass combinations (engine, body, wheel) and different road excitations. The results showed that with optimized parameters ( K u = 3.39×10 ⁴ N/m, B u = 2500 N·s/m, K t = 2.5×10 ⁵ N/m, B r = 100 N·s/m), minimum force transmissibility in the low‑frequency region and low relative‑displacement transmissibility in the high‑frequency region can be achieved. Appropriate matching of M b , M w , and M e further reduced both force and relative‑displacement transmissibility. Under random road excitation, force transmissibility, mount stroke, and suspension stroke increased with road roughness, whereas relative displacement transmissibility between engine and frame decreased significantly (by 67.0 % on Grade B and 85.5 % on Grade C compared to Grade A). With impact excitation, force transmissibility changed variably with grade, while mount and suspension displacements were markedly amplified; nevertheless, the mount maintained effective control across all roughness levels.