The invention discloses a bolt tightening tool which comprises a first base block, a second base block and a connecting block. The first base block and the second base block are connected through theconnecting block, the height of the second base block is larger than that of the first base block, and the first base block is provided with a supporting face. The outline of the supporting face is matched with the outline of a designated part of a cylinder body, a locking claw is arranged at the side end of the second base block in a protruding mode, and the free end of the locking claw extends into a rotating path of a rear balance block of the cylinder body. Compared with the prior art, the problem that the torque cannot reach the specified torque when a bolt is tightened is solved, and meanwhile the problems that the tooth profile parameter exceeds the standard when a gear is used for locking a balance shaft system, and a flat key is sheared and damaged due to overlarge stress are solved.

Bolt tightening tool

The utility model provides a VVT dismouting frock relates to car technical field. It has solved the loaded down with trivial details problem of current VVT dismouting process. This VVT dismouting frock, including the fixed plate, the fixture block has set firmly on the fixed plate, has the profile of tooth that is used for with the VVT meshing on the fixture block, still be equipped with a plurality of setting elements of connecting with engine cylinder block of being used for on the fixed plate, wherein the fixture block directly adopts current VVT sprocket, and through fixed plate and cylinder body fixed connection, fixture block and VVT mesh and fix VVT to make things convenient for VVT's dismouting. The utility model discloses simple structure, convenient operation can greatly simplifyVVT's dismouting process.

VVT dismouting frock

The invention provides a driven wheel, an engine sprocket system and a driven wheel manufacturing method. The pitch radius of the driven wheel is related to the real-time rotation angle of the drivenwheel. The engine sprocket system comprises a crankshaft sprocket, the driven wheel and a chain arranged around the crankshaft sprocket and the driven wheel. The driven wheel manufacturing method comprises the steps of acquiring the torsional vibration characteristics of an engine, and obtaining the rotation angles a of the crankshaft sprocket at different times according to the torsional vibration characteristics of the engine; and designing the tooth profiles of driven wheel teeth according to the rotation angles a of the crankshaft sprocket. The tooth profiles of the driven wheel teeth arerelated to the crankshaft torsional vibration, while the crankshaft torsional vibration depends on the ignition characteristics of the engine; thus, the stress of chain training can be improved effectively through the tooth profile change of the driven wheel, and the engagement positions of the driven wheel with the teeth are different since the tooth profiles of the teeth are different; and original superimposed order noise can be scattered, and the order noise is reduced effectively.

Driven wheel, engine sprocket system and driven wheel manufacturing method

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VVT dismouting frock

Driven wheel, engine sprocket system and driven wheel manufacturing method