| 摘要 |
PURPOSE: A lubricating device for the piston contacting surface of a hydraulic breaker is provided to prevent cracking and damaging due to the contact with a piston and to prevent temperature rise due to friction with a wall. CONSTITUTION: A lubricating device for the piston contacting surface of a hydraulic breaker comprises upper and lower part seals(170a,170b), a forcible lubricating port, a low pressure return port(190), and a low pressure fluid passage. The upper and lower seals are separately attached in the upper and lower side of the lower piston(121) of a cylinder part(120). The space between the upper and lower seals is installed with the low pressure return port for connecting with the low pressure fluid passage(200). The forcible lubricating port(180) is installed the upper part of the upper seal which is the lower end of a large diameter pipe line(L) for supplying high pressure oil. The high pressure oil which is supplied from the forcible lubricating port lubricates between the contacting surfaces of the pistons.
|
