Lubrication structure for working device

摘要

A lubrication structure for a working machine is provided. A driven gear that engages with a driving gear connected to a driving source and rotates, is accommodated in a chamber in a case. An eccentric cam is provided on a surface of the driven gear, and connected to a coupling pin in a blade through a crank member. A fitting ring part is provided in one end of the crank member, and the eccentric cam is inserted into the fitting ring part so as to rotate relative to the fitting ring part. An annular groove is formed on the inner surface of the fitting ring part which faces the outer surface of the eccentric cam. The annular groove communicates with a first chamber via a first lubricating passageway and also communicates with a second chamber via a second lubricating passageway.

主权项

1. A lubrication structure for a working machine comprising:
a case in which a blade is supported to be able to move forward and backward, the blade performing a predetermined operation; a rotation transmitting part configured to rotate by power of a driving source, the rotation transmitting part being rotatably accommodated in a storage chamber formed in the case; an eccentric cam provided in the rotation transmitting part; and a crank member provided to convert torque of the rotation transmitting part into reciprocating motion of the blade, the crank member including: a fitting ring part slidably inserted into the eccentric cam an annular concave groove located on an inner surface of the fitting ring part facing the rotation transmitting part and provided in the sliding contact surface of the eccentric cam and the fitting ring part; a rod part connected to the fitting ring part, the blade being coupled to the rod part; and a lubricating passageway that allows communication between the annular concave groove and at least a space in the storage chamber located outside the eccentric cam in a radial direction of the eccentric cam such that lubricating oil contained in the storage chamber is introduced into a concave part, the concave part being formed in a sliding contact surface between an outer surface of the eccentric cam and an inner surface of the fitting ring part.