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EP-4234172-B1 - HYDRAULIC BREAKER PROVIDED WITH AUTOMATIC LUBRICANT SUPPLY STRUCTURE

EP4234172B1EP 4234172 B1EP4234172 B1EP 4234172B1EP-4234172-B1

Inventors

  • LEE, SANG WOO

Dates

Publication Date
20260506
Application Date
20180529

Claims (7)

  1. A hydraulic breaker comprising: a bracket (300); a body (100) coupled to an inside of the bracket (300); a piston (124) provided in the body (100) and reciprocating by a working fluid; a chisel (112) provided in the body (100) and configured to be hit by the piston (124); a cartridge coupler (220) to which a lubricant cartridge (210) is detachably directly coupled; a working fluid inlet (121) connected to a hydraulic pump by a supply hose, wherein a high-pressure working fluid provided from the hydraulic pump through the supply hose flows into the working fluid inlet (121); a working fluid outlet (122) connected to a hydraulic tank by a discharge hose, wherein a low-pressure working fluid discharged from the working fluid outlet (122) through the discharge hose flows to the hydraulic tank; an automatic lubricant supply structure (200) being configured to supply a lubricant from the lubricant cartridge (210) using the working fluid; and a supply valve(250) being configured to supply the lubricant to the lubricant injection port (260) in response to a pressure of the working fluid, characterized in that the automatic lubricant supply structure (200) comprises: a working fluid line (230) disposed in the body (100), the working fluid line (230) having one end communicating with the working fluid inlet (121) and another end communicating with the supply valve (250); and a lubricant line (240) disposed in the body (100) and configured to supply the lubricant to the lubricant injection port (260), the lubricant line (240) having one end communicating with the supply valve (250) and another end communicating with the lubricant injection port (260).
  2. The hydraulic breaker of claim 1, wherein the supply valve includes: a first chamber (271) having a first hole (281) that communicates with the working fluid line and filled with the working fluid through the first hole (281); a second chamber (275) communicating with a lubricant inlet (273) and filled with the lubricant of the lubricant cartridge (210) through the lubricant inlet (273); a pumping spool (272) provided between the first chamber (271) and the second chamber (275) and moved in one direction by the pressure of the filled working fluid in the first chamber (271) so that the pumping spool (272) pushes the filled lubricant in the second chamber (275); and a check valve (274) provided on one side of the second chamber (275) and having a second hole (285) that communicates with the lubricant line, and wherein the second chamber (275) is provided between the pumping spool (272) and the check valve (274), and the check valve (274) is opened by a pressure of the filled lubricant in the second chamber (275).
  3. The hydraulic breaker of claim 1 or 2, wherein the body includes a cylinder (120), a front head (110) disposed under the cylinder, and a back head (130) disposed over the cylinder (120), the cartridge coupler (220) is disposed at the back head, and the cartridge coupler (220) is positioned in the same plane as the working fluid inlet (121) of the cylinder (120).
  4. The hydraulic breaker of claim 2 or 3, wherein the working fluid inlet (121) and a working fluid outlet (122) of the body are accommodated in the housing (310); and the cover(330) cover the working fluid inlet (121) and the working fluid outlet (122).
  5. The hydraulic breaker of claim 4, wherein the cover (330) has a cartridge insertion groove (331) that communicates with a body seat hole of the cartridge coupler (220, 220', 220"), an inlet connector (333) that communicates with the working fluid inlet (121), and an outlet connector (335) that communicates with the working fluid outlet (122).
  6. The hydraulic breaker of claim 2 to 4, wherein the cartridge coupler (220, 220', 220"), the working fluid inlet (121), and the working fluid outlet (122) are positioned on a rear surface of the body (100), and the housing (310) is positioned on a rear surface of the bracket (300) to be positioned on the rear surface of the body when the bracket (300) is coupled to the body (100).
  7. The hydraulic breaker of claim 6, wherein a height of the housing (310) is larger than or the same as protrusive heights of the cartridge coupler (220, 220', 220"), the working fluid inlet (121), and the working fluid outlet (122).

Description

Technical Field The present invention relates to a hydraulic breaker and, more particularly, to a hydraulic breaker provided with an automatic lubricant supply structure. Background Art In general, a hydraulic breaker is an apparatus that is mounted on construction equipment such as an excavator and breaks an object such as a rock and concrete using a hitting force that is generated by moving up/down a piston that is an ascending/descending member using power such as hydraulic pressure. According to hydraulic breakers of the related art, a worker has to periodically directly inject a lubricant to prevent a chisel that is hit by a piston moving up/down from being wom due to friction, so there is a problem that the work efficiency decreases. Further, since a worker must periodically directly inject a lubricant, as described above, when the timing to inject a lubricant is missed, a supporting portion is severely worn, which causes reduction of lifespan of the piston and the chisel and severe damage to the hydraulic breakers. In order to solve these problems, hydraulic breakers that automatically supply a lubricant have been developed, and such hydraulic breakers have been disclosed in Korean Patent No. 10-0908218 (hereafter, referred to as a 'patent document 1') and Korean Patent No. 10-0468942 (hereafter, referred to as 'patent document 2'). First, the patent document 1 proposes a hydraulic breaker that automatically supplies a lubricant, in which an automatic lubricant supply apparatus is integrated with the hydraulic breaker. According to the hydraulic breaker of the patent document 1, a ball blocks a supply channel when the hydraulic breaker is not operated, so a lubricant is not discharged even though a pressure plate presses the lubricant in a lubricant chamber. Further, when the hydraulic breaker is operated, a chisel applies a reacting force to a piston and the reacting force applied to the piston is transmitted to the lubricant chamber and presses the pressing plate together with an elastic force of an elastic member in the lubricant chamber, so the ball blocking the supply channel is pushed up and the lubricant is supplied into a front head through the supply channel. As described above, according to the hydraulic breaker of the patent document 1, since the supply channel is opened and the lubricant is supplied every time the piston hits the chisel, the lubricant is automatically supplied. However, according to the patent document 1, when the chisel is hit, elasticity is generated in the elastic member due to vibration, etc., and accordingly the lubricant is supplied. Therefore, if vibration is generated even though the hydraulic breaker is not operated (e.g., when the hydraulic breaker is carried by a truck, etc.), malfunction such as supply of the lubricant may occur in the lubricant supply mechanism. The patent document 2 proposes an automatic lubricator that is separately attached to the body of a breaker. The automatic lubricator of the patent document 2 is separately attached to a side of a body and a grease cartridge filled with grease is detachably coupled to the automatic lubricator. Further, the automatic lubricator has a hydraulic pressure entrance that is connected to a hydraulic line of an excavator, so when high hydraulic pressure is supplied into the automatic lubricator through the hydraulic pressure entrance, a valve opens and the grease in the grease cartridge is supplied to a breaker through a grease outlet. According to the patent document 2, unlike the patent document 1, since grease is automatically supplied by high hydraulic pressure, it is possible to solve the problem of malfunction in the patent document 1. However, according to the patent document 2, since the automatic lubricator is attached to a breaker as a separate part, the automatic lubricator is exposed to the outside. Accordingly, there are problems that 1) the automatic lubricator may be broken by fragments of a rock when the rock is broken and 2) the size of a breaker increases, so it may not be easily mounted on an excavator. Furthermore US2013240299A1 discloses another hydraulic breaker with external hoses. Further, since the hydraulic pressure entrance and the hydraulic line of an excavator are connected through a hose, the hose structure becomes very complicated when the hydraulic lubricator is mounted on a breaker. This is because since a breaker has an intake line through which a working fluid flows into the breaker and a discharge line through which a working fluid is discharged from the breaker to an excavator, when a separate hose is added, at least three hoses are required. [Related Art Document] [Patent Document] (Patent Document 1) Korean Patent No. 10-0908218(Patent Document 2) Korean Patent No. 10-0468942 Disclosure Technical Problem The present invention has been made in an effort to solve the problems described above and an objective of the present invention is to provide a hydraulic breaker provid