The present invention relates to a hydraulic hammer, and more specifically, to a low-noise hydraulic hammer, wherein an impact bar that is accommodated inside of a piston is inclined so as not to contact the inside of the piston thereby preventing cracks, and a noise insulating material or a heat sink is installed inside the piston or outside the impact bar, thereby reducing noise and improving heat radiation performance.

A sleeve is disclosed for use with a piston of a hydraulic hammer. The sleeve may have a generally cylindrical body with a top end and a bottom end, and a central bore passing axially from the top end of the generally cylindrical body to the bottom end. The generally cylindrical body may be a composite structure including a guide layer forming an inner annular surface of the central bore, an energizer layer located radially outward of the guide layer and being bonded to the guide layer, and a support layer bonded to the energizer layer. The support layer may form an outer surface of the generally cylindrical body.

A sleeve is disclosed for use with a piston of a hydraulic hammer. The sleeve may have a generally cylindrical body with a top end and a bottom end, and a central bore passing axially from the top end of the generally cylindrical body to the bottom end. The generally cylindrical body may be a composite structure including a guide layer forming an inner annular surface of the central bore, an energizer layer located radially outward of the guide layer and being bonded to the guide layer, and a support layer bonded to the energizer layer. The support layer may form an outer surface of the generally cylindrical body.

A lubrication system including a drive fluid chamber and a lubricant chamber. A first movable member is movable from a first position to a second position within the drive fluid chamber in response to drive fluid pressure acting on the first movable member. A second movable member is movable between a first position and a second position within the lubricant chamber and is operatively coupled to the first movable member. A biasing member is positioned to bias the first movable member toward the first position. A relief valve is associated with the first movable member and, when the relief valve in an open state, the drive fluid pressure acting on the first movable member is reduced such that the biasing member moves the first movable member to the first position within the drive fluid chamber.

A lubrication system including a drive fluid chamber and a lubricant chamber. A first movable member is movable from a first position to a second position within the drive fluid chamber in response to drive fluid pressure acting on the first movable member. A second movable member is movable between a first position and a second position within the lubricant chamber and is operatively coupled to the first movable member. A biasing member is positioned to bias the first movable member toward the first position. A relief valve is associated with the first movable member and, when the relief valve in an open state, the drive fluid pressure acting on the first movable member is reduced such that the biasing member moves the first movable member to the first position within the drive fluid chamber.

A power tool mainly includes a main body and a transmission shaft. The transmission shaft includes: a main body, including a driving section, an acting section and an axle body section between the driving section and the acting section, the driving section to be defined inside the main body in a rotary style; an axial channel, defined inside the main body; a first radial oil-filling channel, defined on the driving section of the main body, the first radial oil-filling channel connected to the axial channel, and the first radial oil-filling channel connected to the internal space of the main body preset to be lubricated; and a second radial oil-filling channel, defined on the acting section of the main body, the second radial oil-filling channel connected to the axial channel, and the second radial oil-filling channel goes out of the periphery of the acting section to form an oil-filling hole.

A power tool mainly includes a main body and a transmission shaft. The transmission shaft includes: a main body, including a driving section, an acting section and an axle body section between the driving section and the acting section, the driving section to be defined inside the main body in a rotary style; an axial channel, defined inside the main body; a first radial oil-filling channel, defined on the driving section of the main body, the first radial oil-filling channel connected to the axial channel, and the first radial oil-filling channel connected to the internal space of the main body preset to be lubricated; and a second radial oil-filling channel, defined on the acting section of the main body, the second radial oil-filling channel connected to the axial channel, and the second radial oil-filling channel goes out of the periphery of the acting section to form an oil-filling hole.

A method of regulating the disassembly of a component from a powered tool assembly that uses a pressurized fluid and a locking member that is in operative association or communication with the fluid is provided. The method comprises biasing the locking member into a locked configuration using the pressurized fluid, preventing movement of the component in a first predetermined direction.

A method of regulating the disassembly of a component from a powered tool assembly that uses a pressurized fluid and a locking member that is in operative association or communication with the fluid is provided. The method comprises biasing the locking member into a locked configuration using the pressurized fluid, preventing movement of the component in a first predetermined direction.

A handheld tool apparatus comprising a spindle blocking apparatus and a torque limiting unit that includes at least one limiting spring and a stop arrangement that is supported movably against the limiting spring. It is provided that the stop arrangement of the torque limiting unit nonrotatably secure a wedging arrangement of the spindle blocking apparatus.