JP3023693U - Hydraulic breaker - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a hydraulic breaker in which the bush can be easily replaced, and the connecting portion between the cylinder and the holder prevents the bush from being affected by an external force. SOLUTION: In a hydraulic breaker in which a cylinder that slidably guides a piston and a holder that slidably guides a chisel are axially coupled, and a piston driven by pressure oil strikes the chisel, the cylinder is A disk-shaped protrusion is bulged at the cylinder end of the connecting part with the holder, and a receiving hole is formed at the end of the holder for fitting with the protrusion, and the protruding part is fitted into the receiving hole to form a cylinder. Bush that has a flange that is connected to the holder and through which a screw hole for removal is installed is seated in the recessed seat that is recessed in the protruding part so that the outer diameter of the flange does not contact the protruding part, and screwed with a bolt. The hydraulic breaker is detachably attached to the cylinder.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a hydraulic breaker used for civil works and crushing work in a quarry, and more particularly to a hydraulic breaker in which a bush is detachably provided at a place where seizure of a cylinder is likely to occur.

[0002]

[Prior art]

 Hydraulic breakers are used for crushing work in civil engineering works and quarries. As a hydraulic breaker, there is one shown in FIG. A cylinder 102 that slidably accommodates the piston 101, a holder 104 that slidably guides the chisel 103, and a cover 105 that covers the upper end of the piston 101 are connected together by connecting bolts (not shown). I'm tied. By switching the pressure oil, the piston 101 is slid up and down to hit the chisel 103, and the chisel 103 crushes rocks and the like.

When this hydraulic breaker is continuously used, seizure often occurs between the piston 101 and the cylinder 102. The seizure is particularly severe in the vicinity of the connecting portion of the cylinder 102 with the holder 104. This is because the chisel 103 sometimes tilts with respect to the axis of the cylinder 102 when hitting a crushed object, and dust in the pressure oil easily collects at that position. These are likely to occur when the usage, maintenance and inspection of the hydraulic breaker are insufficient.

As a repairing method, one is to replace the damaged cylinder 102 with a new one, and the other is to insert a bush 106 into the damaged portion of the cylinder 102 as shown in FIG. . To insert the bush 106, the peripheral part of the cylinder 102 where scratches have occurred is machined away, and then a bushing that has been heat-treated with a similar material is tightly inserted using a coolant such as liquid nitrogen. This is a method of reconditioning where the inner diameter is ground to a specified size and surface roughness for finishing.

As shown in FIG. 3, the cylinder 102 and the holder 104 have a disk-shaped protrusion 107 formed in the lower portion of the cylinder 102, and the protrusion 107 is fitted to the upper end of the holder 104. The receiving hole 108 is recessed, and the projecting portion 107 is fitted into the receiving hole 108 to be integrally connected.

[0006]

[Problems to be solved by the device]

 If seizure occurs between the piston and cylinder of the hydraulic breaker and repair is required, the method of replacing the cylinder with a new one was extremely expensive despite the localized damage. Next, the method of inserting the bush needs to be carried out in a specialized factory such as a maker for special work such as interference fitting and grinding, which causes a problem of high cost and time-consuming repair.

[0007] Furthermore, since the cylinder part, which is particularly prone to seizure, is located at the connection part with the holder, excessive prying due to the operation of a hydraulic excavator or the like and distortion of the fitting part due to other external forces will slide. This could affect the moving parts and could cause seizure.

[0008]

[Means for Solving the Problems]

 In view of the above circumstances, the present invention guides the piston slidably so that the bush can be easily replaced and the bush is not affected by the external force at the connecting portion between the cylinder and the holder. In a hydraulic breaker that axially connects a cylinder and a holder that slidably guides the chisel, and strikes the chisel with a piston driven by pressure oil, a circle is formed at the cylinder end of the connecting part between the cylinder and the holder. The board-shaped protrusion is bulged, and a receiving hole is formed at the end of the holder so that it fits with the above-mentioned protrusion.The protrusion is fitted into the receiving hole to connect the cylinder and the holder. Install a bush with a flange that penetrates through the recessed seat in the protruding part so that the outside diameter of the flange does not come into contact with the protruding part, and tighten it with a bolt to remove it from the cylinder. And a hydraulic breaker to be Te.

[0009]

[Action]

 A bush is detachably installed at the cylinder end of the connecting part between the cylinder and the holder, and the projection and the receiving hole are fitted so that the bush is not affected by external force, and the flange of the bush contacts the projection. Repairs such as seizure of pistons and cylinders will become very easy, and it will be possible to repair only the necessary parts in a short time in a general factory owned by the user. Distortion of the fitting part due to prying or other external force does not affect the sliding part, and the repair cost, which was very expensive in the past, is inexpensive, and it is possible to provide a reliable hydraulic breaker.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

 The present invention will be described in detail below based on specific embodiments shown in the accompanying drawings. In FIG. 1, a cylinder 2 that slidably guides a piston 1 and a holder 4 that slidably guides a chisel 3 are axially connected by connecting bolts (not shown).

The piston 1 slides up and down by switching the pressure oil and hits the chisel 3. A disk-shaped protrusion 11 is bulged at the cylinder end of the connecting portion between the cylinder 2 and the holder 4. A circular receiving hole 12 is formed at the end of the holder 4 so as to fit with the projecting portion 11. The projecting portion 11 is fitted into the receiving hole 12 and the cylinder 2 and the holder 4 are screwed and connected with a connecting bolt. .

A bush 15 having at one end a flange 14 having a plurality of screw holes 13 for removal is provided in a recessed seat 16 which is concentrically recessed in the protrusion 11, and a flange outer diameter 17 contacts the protrusion 11. To prevent this, a proper clearance C is provided, the seat is seated, and it is screwed with a mounting bolt 18 to be detachably mounted on the cylinder 2. The bush 15 has its outer diameter finished so that it can be fitted into the cylinder 2 with a clearance fit or a tight fit so that it can be easily attached to and detached from the cylinder 2, and the inner diameter of the bush 15 must be machined beforehand in order to eliminate the need for on-site machining. Grind in advance.

Reference numerals 19, 20, 21, and 22 are seals. When replacing the bush 15 due to seizure, disconnect the cylinder 2 from the holder 4, remove the mounting bolt 18, and then remove the mounting bolt 18 from the flange 14 to remove bolts 13 in the removal screw holes 13. (Not shown) is screwed in and screwed in, the tip of the bolt comes into contact with the bearing surface 23 of the recessed seat 16, and when the bolt is still screwed in, the flange 14 separates from the bearing surface 23 and the bush 15 Can be taken out from the cylinder 2. Since the bush 15 is a loose fit or a tight fit and not a tight fit on the cylinder 2, it can be easily removed.

FIG. 2 shows another embodiment of the present invention in which a bush is provided over the entire sliding portion of the cylinder. The bush may be provided as needed over part or all of the sliding portion of the cylinder. Reference numeral 5 is a cover.

[0015]

[Effect of device]

 As described above, the present invention axially connects the cylinder that slidably guides the piston and the holder that slidably guides the chisel, and strikes the chisel with the piston driven by the pressure oil. In a hydraulic breaker, a disk-shaped protruding part is bulged at the cylinder end of the connecting part between the cylinder and the holder, and a receiving hole that fits with the protruding part is provided in the holder end, and the protruding part is provided in the receiving hole. Connect the cylinder and the holder by fitting them together, and attach the bush having a flange that penetrates the screw hole for removal so that the outer diameter of the flange does not come into contact with the protruding part in the recessed seat that is recessed in the protruding part. This is a hydraulic breaker that is seated and screwed with bolts so that it can be attached to and removed from the cylinder.If the sliding part of the cylinder becomes unusable due to seizure, replace the bush from the cylinder. Is no need to replace the cylinder itself new by.

Further, in the bush according to the present invention, the flange is screwed with a mounting bolt and a screw hole is formed on the flange for removal. Therefore, the mounting bolt is removed, and the bolt is screwed into the screw hole for removal and screwed. By doing so, the bush can be easily replaced. In addition, the bush of the present invention has an outer diameter portion attached to the protruding portion of the cylinder with a gap interposed, and excessive twisting or prying due to operation of a hydraulic excavator or the like at the fitting portion of the connection between the cylinder and the holder. The distortion of the fitting part due to other external forces does not affect the sliding part.

Therefore, the hydraulic breaker according to the present invention can repair only a necessary part in a general factory owned by the user in a short period of time, and the repair cost, which is conventionally very expensive, is significantly reduced. However, it has become possible to provide a reliable hydraulic breaker. Furthermore, the hydraulic breaker of the present invention also facilitates maintenance.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view of a main part of a specific embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of another embodiment of the present invention in which a bush is provided over the entire length of the sliding portion of the cylinder.

FIG. 3 is a vertical sectional view of a conventional hydraulic breaker.

FIG. 4 is a vertical cross-sectional view of another conventional hydraulic breaker.

[Explanation of symbols]

 1 ... Piston 2 ... Cylinder 3 ... Chisel 4 ... Holder 11 ... Projection 12 ... Receiving hole 13 ... Removal screw hole 14 ... Flange 15 ... Bushing 16 ... Recessed seat 17 ... Flange outer diameter C ... Gap 18 ... Mounting bolt 19・ 20 ・ 21 ・ 22 ... Seal 23 ... Bearing surface

Claims (1)

[Scope of utility model registration request] 1. A hydraulic breaker in which a cylinder for slidably guiding a piston and a holder for slidably guiding a chisel are axially connected, and a piston driven by pressure oil strikes the chisel. A disk-shaped protrusion is bulged at the cylinder end of the connecting part between the holder and the holder, and a receiving hole is formed in the holder end to engage with the protrusion, and the protruding part is fitted into the receiving hole to form a cylinder. The bush with a flange that connects the holder and the screw hole for removal, and is seated in the recess seat recessed in the protrusion so that the outer diameter of the flange does not contact the protrusion and screwed with a bolt. Hydraulic breaker detachably mounted on the tightening cylinder.