Bolt connection structure for engine vibration-isolating installation

The invention provides a bolt connection structure for engine vibration-isolating installation. The bolt connection structure comprises a connection bolt, a connector, a connection unit and a connected base body. Screwing directions of threads of the inner wall and the outer wall of the connection unit in the shape of a thin-walled cylinder are opposite, an annular shoulder is formed at one end of the connection unit, the other end of the connection unit is screwed into a connection chamber of the connected base body, a leftward-screwing internal thread is processed on the portion, connected with the connection unit, in the connection chamber, and a rightward-screwing internal thread is processed on the portion, connected with the connection bolt, in the connection chamber. When the connection bolt is screwed into the connected base body, the connection unit moves reversely under the action of friction torque to enable the small-area annular shoulder to contact with the bottom surface of the connector, so that engine vibration transfer can be reduced; as screwing torque of the connection bolt increases, self-locking can be achieved by the threads between the connection bolt and the connection unit as well as between the connection unit and the base body, so that connection reliability is enhanced; the bolt connection structure is simple and good in vibration-isolating effect.