Hydraulic breaker provided with automatic lubricant supply structure

A hydraulic breaker comprising:

• a bracket;
• a body coupled to an inside of the bracket;
• a piston provided in the body and reciprocating by a working fluid;
• a chisel provided in the body and configured to be hit by the piston;
• a cartridge coupler disposed in the body and to which a lubricant cartridge is detachably directly coupled;
• and
• an automatic lubricant supply structure disposed in the body to supply a lubricant of the lubricant cartridge using the working fluid,
• wherein the body includes a cylinder, a front head disposed under the cylinder, and a back head disposed over the cylinder,
• wherein the automatic lubricant supply structure includes:
• a working fluid line disposed in the body and that communicates with a working fluid inlet of the body;
• a lubricant line disposed in the body and configured to supply the lubricant to a lubricant injection port;
• and
• a supply valve disposed in the body, that communicates with the working fluid line, the lubricant line, and the cartridge coupler, and supplies the lubricant to the lubricant injection port through the lubricant line, depending on a pressure of the working fluid which flows inside through the working fluid line,
• wherein the working fluid line is formed through the cylinder and the back head, and has one end that communicates with the working fluid inlet and another end that communicates with the supply valve,
• wherein the working fluid line serves to operate the supply valve by supplying the working fluid, which flows into the body through the working fluid inlet, to the supply valve,
• wherein the lubricant line is formed through the back head, the cylinder, and the front head, and has one end that communicates with the supply valve and another end that communicates with the lubricant injection port,
• wherein the lubricant line functions as a passage through which the lubricant supplied from the supply valve flows to the lubricant injection port,
• wherein the supply valve includes:
• a first chamber having a first hole that communicates with the working fluid line and filled with the working fluid through the first hole;
• a second chamber communicating with a lubricant inlet and filled with the lubricant of the lubricant cartridge through the lubricant inlet;
• a pumping spool provided between the first chamber and the second chamber and moved in one direction by the pressure of the filled working fluid in the first chamber so that the pumping spool pushes the filled lubricant in the second chamber;
• and
• a check valve provided on one side of the second chamber and having a second hole that communicates with the lubricant line, and
• wherein the second chamber is provided between the pumping spool and the check valve, and the check valve is opened by a pressure of the filled lubricant in the second chamber.