Hydraulic hammer equipped with automatic lubricant supply structure

Abstract

The present invention relates to a hydraulic hammer and, more specifically, to a hydraulic hammer provided with an automatic lubricant supply structure. In particular, the present invention relates to a hydraulic hammer that automatically supplies lubricant without the need for a separate hose, using hydraulic oil, and which has an automatic lubricant supply structure integrated into the main body of the hydraulic hammer, which can be used without a separate external component.

Description

Hydraulic hammer equipped with automatic lubricant supply structure Technical field The present invention relates to a hydraulic hammer and, more particularly, to a hydraulic hammer provided with an automatic lubricant supply structure. Background of the technique In general, a hydraulic hammer is a device mounted on construction equipment, such as an excavator, that breaks objects like rock and concrete using a striking force generated by the up-and-down movement of a piston. This piston is powered by hydraulic pressure. Depending on the hydraulic hammer, a worker must periodically inject lubricant to prevent wear from friction on the chisel struck by the piston, which reduces work efficiency.Furthermore, since a worker must periodically inject a lubricant directly, as described above, when time is lost in injecting a lubricant, a portion of the support wears down significantly, resulting in a reduction of the piston and chisel lifespan and serious damage to the hydraulic hammers. To solve these problems, hydraulic hammers that automatically supply a lubricant have been developed, and such hydraulic hammers have been disclosed in Korean Patent No. 10-0908218 (hereinafter referred to as 'Patent Document 1') and Korean Patent No. 10-0468942 (hereinafter referred to as 'Patent Document 2'). First, patent document 1 proposes a hydraulic hammer that automatically dispenses lubricant, in which an automatic lubricant dispensing device is integrated with the hydraulic hammer. According to the hydraulic hammer of patent document 1, a ball blocks a supply channel when the hydraulic hammer is not operated, so no lubricant is discharged even though a pressure plate presses the lubricant into a lubrication chamber. Furthermore, when the hydraulic hammer is operated, a chisel applies a reaction force to a piston, and this reaction force is transmitted to the lubricant chamber. This force, combined with an elastic force from an elastic member within the chamber, presses the pressure plate, causing the ball blocking the supply channel to be pushed upwards, and the lubricant is dispensed to a front head through the supply channel. As described above, according to the hydraulic hammer in patent document 1, since the supply channel opens and the lubricant is supplied each time the piston strikes the chisel, the lubricant is supplied automatically. However, according to patent document 1, when the chisel is struck, elasticity is generated in the elastic member due to vibration, etc., and consequently, the lubricant is supplied. Therefore, if vibration is generated even when the hydraulic hammer is not being operated (for example, when the hydraulic hammer is being transported by truck, etc.), a malfunction, such as a lubricant supply issue, may occur in the lubricant supply mechanism. Patent document 2 proposes an automatic lubricator that is separately attached to the body of a hammer. The automatic lubricator of patent document 2 is separately attached to one side of a body, and a grease cartridge filled with grease is detachably coupled to the automatic lubricator. In addition, the automatic lubricator has a hydraulic pressure inlet that is connected to a hydraulic line from an excavator, so when high hydraulic pressure is supplied to the automatic lubricator through the hydraulic pressure inlet, a valve opens and the grease in the grease cartridge is supplied to a hammer through a grease outlet. According to patent document 2, unlike patent document 1, since the grease is supplied automatically by high hydraulic pressure, it is possible to solve the malfunction problem in patent document 1. However, according to patent document 2, since the automatic lubricator is attached to a hammer as a separate part, it is exposed to the elements. Consequently, there are problems: 1) the automatic lubricator can be damaged by rock fragments when the rock is broken, and 2) it increases the size of the hammer, making it difficult to mount on an excavator. Also, document US2013240299A1 discloses another hydraulic hammer with external hoses. Furthermore, since the hydraulic pressure inlet and hydraulic line of an excavator are connected via a hose, the hose structure becomes very complex when the hydraulic lubricator is mounted on a hammer. This is because, since a hammer has an inlet line through which working fluid flows into the hammer and a discharge line through which working fluid is discharged from the hammer to the excavator, adding a separate hose requires at least three hoses. Related technical document Patent document (Patent Document 1) Korean Patent No. 10-0908218 (Patent Document 2) Korean Patent No. 10-0468942 Divulgation 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 hammer provided with an automatic lubricant supply structure that automatically supplies a lubricant without a separate hose using a working fluid and can be used without a separate external part because it is installed in the body of the hydraulic hammer. Technical solution A hydraulic hammer provided with an automatic lubricant supply structure according to an aspect of the present invention is provided as defined in claim 1. Additional embodiments are defined in the dependent claims. Advantageous effects The hydraulic hammer provided with an automatic lubricant supply structure according to an aspect of the present invention described above has the following effects. Since the automatic lubricant supply system is operated by a working fluid, lubricant is only dispensed when the hydraulic hammer is in operation. Consequently, the problem of lubricant being dispensed when the hydraulic hammer is not operating is resolved, thus reducing unnecessary lubricant waste. Since the automatic lubricant supply structure is arranged in the body of the hydraulic hammer, it is possible to prevent the automatic lubricant supply structure from being damaged by rock fragments, etc. when breaking rocks. The body structure in which the automatic lubricant supply structure is arranged is simple and makes use of the body space, making it possible to manufacture a compact hydraulic hammer. Since there is no need for a separate hose in the lubricant supply line of the automatic lubricant supply system, there is no need for any hoses other than the supply and discharge hoses when connecting the hydraulic hammer to an excavator's hydraulic pump. Consequently, the hose structure is simplified, ensuring unrestricted use of the hydraulic hammer mounted on an excavator and guaranteeing high compatibility in the hydraulic connection between the excavator and the hammer. Furthermore, it prevents damage to a specific hose from rocks during breaking operations. Since the lubricant cartridge supplies a lubricant that can be separated from the body, it is possible to simply supply a lubricant by replacing the lubricant cartridge. Description of drawings Figure 1 is a view showing a hydraulic hammer provided with an automatic lubricant supply structure according to an illustrative embodiment of the present invention. Figure 2 is a cross-sectional view taken along line AA' of Figure 1. Figure 3 is a rear view of the hydraulic hammer in Figure 1. Figure 4 is a cross-sectional view taken along line BB' of Figure 1. Figure 5 is a cross-sectional view showing a pump spool that has been moved into the state of Figure 4. Figure 6 is a cross-sectional view showing a check valve that has been opened in the state of Figure 5. Figure 7 is a schematic view of the automatic lubricant supply structure in the hydraulic hammer provided with an automatic lubricant supply structure according to an illustrative embodiment of the present invention. Figure 8 is a view showing the hydraulic hammer provided with an automatic lubricant supply structure according to an illustrative embodiment of the present invention and a support that is coupled to the hydraulic hammer. Figures 9 and 10 are views of the assembly of the support in Figure 8 and the hydraulic hammer in Figure 8. Figure 11 is a view showing a first modified example of the hydraulic hammer provided with an automatic lubricant supply structure according to an illustrative embodiment of the present invention. Figure 12 is a view showing a second modified example of the hydraulic hammer provided with an automatic lubricant supply structure according to an illustrative embodiment of the present invention. Mode of invention The following description provides only the principle of the present invention. Consequently, those skilled in the art may implement the principle of the present invention and various apparatus included within the concept and scope of the present invention, even if they are not explicitly described or shown herein. All terminology and conditional embodiments described herein are to be understood as definitively conceived solely for the purpose of understanding the concept of the present invention, without limiting the embodiments and states specifically stated. The objectives, features, and advantages of the present invention described above will be made clearer through the following detailed description related to the attached drawing, so that the spirit of the present invention could be easily implemented by those skilled in the art. Hereafter, a hydraulic hammer 10 provided with an automatic lubricant supply structure 200 is described according to an illustrative embodiment of the present invention. Figure 1 is a view showing a hydraulic hammer provided with an automatic lubricant supply structure according to an illustrative embodiment of the present invention, Figure 2 is a cross-sectional view taken along line AA' of Figure 1, Figure 3 is a rear view of the hydraulic hammer of Figure 1, Figure 4 is a cross-sectional view taken along line BB' of Figure 1.Figure 5 is a cross-sectional view showing a pump spool that has moved in the state of Figure 4, Figure 6 is a cross-sectional view showing a check valve that has opened in the state of Figure 5, Figure 7 is a schematic view of the automatic lubricant supply structure in the hydraulic hammer provided with an automatic lubricant supply structure according to an illustrative embodiment of the present invention, Figure 8 is a view showing the hydraulic hammer provided with an automatic lubricant supply structure according to an illustrative embodiment of the present invention and a support that is coupled to the hydraulic hammer, and Figures 9 and 10 are views of the assembly of the support of Figure 8 and the hydraulic hammer of Figure 8. As shown in Figures 1 to 3, and 7, a hydraulic hammer 10 according to an illustrative embodiment of the present invention may include a body 100, a piston 124 oscillating in the body 100, a working fluid channel 126 formed in the body 100 for a working fluid alternating the piston 124 to flow through it, a control valve 125 controlling the flow of the working fluid, a chisel 112 configured to be struck by the piston 124, and an automatic lubricant supply structure 200 disposed in the body 100. In the hydraulic hammer 10, the automatic lubricant supply structure 200 that supplies a lubricant using a working fluid is arranged in the body 100, and a lubricant cartridge 210 is detachably coupled to the automatic lubricant supply structure 200. In other words, the lubricant cartridge 210 is directly and detachably coupled to the automatic lubricant supply structure 200, without using a hose in a lubricant supply line. The body 100 can be assembled by combining a cylinder 120, a front head 110 arranged below the cylinder 120, and a rear head 130 arranged above the cylinder 120. In other words, the front head 110, cylinder 120 and rear head 130 are positioned upwards from the bottom, and the front head 110, cylinder 120 and rear head 130 can be fastened together by long bolts B. The rock-breaking chisel 112 is arranged in a first hole 111 formed in the front head 110. A working fluid inlet 121 and a working fluid outlet 122 are formed through the rear surface of the cylinder 120, and the piston 124 moving up and down in the cylinder 120 is arranged in a second bore 123 formed in the cylinder 120. The control valve 125, which controls the flow of a working fluid flowing in the body 100 through the working fluid inlet 121, to a lower chamber 124a or an upper chamber 124b, is arranged in the cylinder 120. In detail, when the control valve 125 is closed and a working fluid is supplied through the working fluid inlet 121, the working fluid flows into the lower chamber 124a through the working fluid channel 126. Conversely, when the control valve 125 is opened and a working fluid is supplied through the working fluid inlet 121, the working fluid flows into the upper chamber 124b. When a working fluid flows into the lower chamber 124a, the piston 124 moves upward. When the piston 124 moves to top dead center, the control valve 125 allows the working fluid to flow into the upper chamber 124b, so the piston 124 moves downward. In other words, piston 124 is controlled to move repeatedly up and down by control valve 125. When piston 124 moves down, the bottom of piston 124 strikes the top of chisel 112, and chisel 112 moves down and breaks the ground by the force of the impact. A gas chamber 131, connected to an orifice in the cylinder 120, is formed in the rear headstock 130 and filled with nitrogen gas. The nitrogen gas in the gas chamber 131 serves to dampen the shock when the piston 124 reacts upwards after striking the chisel 112. As described above, the operation of the hydraulic hammer 10 is achieved by means of a working fluid. A hydraulic pump and a hydraulic reservoir of equipment such as an excavator are connected to the working fluid inlet 121 and the working fluid outlet 122 of the hydraulic hammer 10 to send a working fluid into the body 100 of the hydraulic hammer 10 and discharge a working fluid from the body 100. In this case, the hydraulic pump and the working fluid inlet 121 are connected by a supply hose, and high-pressure working fluid supplied from the hydraulic pump through the supply hose flows into the working fluid inlet 121. The hydraulic reservoir and the working fluid outlet 122 are connected by a discharge hose, and low-pressure working fluid discharged from the working fluid outlet 122 through the discharge hose flows into the hydraulic reservoir. The automatic lubricant supply structure 200, as shown in Figures 1, 3, and 7, includes a cartridge coupler 220 to which the lubricant cartridge 210 is coupled, and a lubricant supply line that communicates with the cartridge coupler 220. The lubricant cartridge 210 has a body 211 in which a lubricant is held, and an injection port 213 formed in the lower part of the body 211. Threads (not shown) can be formed in the injection port 213 and can be threaded to threads (not shown) formed in a body seat hole 221 of the cartridge coupler 220. A body seat hole 221 in which the body 211 of the lubricant cartridge 210 sits and an injection port seat hole 223 in which the injection port 213 of the lubricant cartridge 210 sits may be formed in the cartridge coupler 220. In this case, the body seat hole 221 and the injection port seat hole 223 may communicate with each other. The cartridge coupler 220 can be formed on the rear surface of the rear head 130, so the cartridge coupler 220 is placed in the same plane as the working fluid inlet 121 and the working fluid outlet 122 of the cylinder 120. The body seat hole 221 and the injection port seat hole 223 of the cartridge coupler 220 can be formed to have a depth in the direction of a plane that is perpendicular to the rear surface of the rear head 130 (i.e., it can be formed to have a depth in the front-to-rear direction of the hydraulic hammer 10). Consequently, when the body 211 of the lubricant cartridge 210 is seated in the body seat hole 221 of the cartridge coupler 220 and the injection port 213 of the lubricant cartridge 210 is threaded into the injection port seat hole 223 of the cartridge coupler 220, the body 211 of the lubricant cartridge 210 protrudes rearward from the hydraulic hammer 10, as the working fluid inlet 121. In other words, when the lubricant cartridge 210 is coupled to the cartridge coupler 220, the lubricant cartridge 210 protrudes rearward from the hydraulic hammer 10 in the same way as the working fluid inlet 121 and the working fluid outlet 122. As shown in Figures 3 and 7, the lubricant supply line serves to selectively supply a lubricant to the chisel 112, depending on whether a working fluid flows inside, and may include a working fluid line 230 that communicates with the working fluid inlet 121 of the body 100, a lubricant line 240 to supply a lubricant to the chisel 112, and a supply valve 250 that communicates with the working fluid line 230, the lubricant line 240 and the cartridge coupler 220 and supplies a lubricant in the lubricant cartridge 210 to the chisel 112 through the lubricant line 240, depending on whether a working fluid flows inside through the working fluid line 230. The working fluid line 230 is formed through the cylinder 120 and the rear head 130 and has one end that communicates with the working fluid inlet 121 and another end that communicates with the supply valve 250. The working fluid line 230 serves to operate the supply valve 250 by supplying the working fluid, which flows to the body 100 through the working fluid inlet 121, to the supply valve 250. The lubricant line 240 is formed through the rear header 130, cylinder 120 and front header 110, and has one end that communicates with the supply valve 250 and another end that communicates with a lubricant injection port 260. Lubricant line 240 functions as a passage through which lubricant supplied from the supply valve flows to lubricant injection port 260. The lubricant injection port 260 connects the first hole 111 formed in the front head 110 to the lubricant line 240 and, consequently, the lubricant flowing through the lubricant line 240 can be supplied to the chisel 112 through the first hole 111. As shown in Figures 3, 4, and 7, the supply valve 250 is arranged in the rear head 130 and communicates with the working fluid line 230, the lubricant line 240, and the cartridge coupler 220. The supply valve 250 serves to supply the lubricant in the lubricant cartridge 210 to the chisel 112 through the lubricant line 240, depending on whether a working fluid flows in through the working fluid line 230.The supply valve 250 may include a first chamber 271 having a first orifice 281 that communicates with the working fluid line 230, a pumping spool 272 that is operated by a working fluid in the first chamber 271, a lubricant inlet 273 that connects the injection port seat orifice 223 and the supply valve 250, a check valve 274 having a second orifice 285 that communicates with the lubricant line 240, and a second chamber 275 that communicates with the lubricant inlet 273 and the check valve 274. The first orifice 282 that communicates with the working fluid line 230 is formed in the first chamber 271. The first chamber 271 serves to provide a space that is filled with a working fluid when the working fluid in the working fluid line 230 flows into the first chamber 271 through the first orifice 281. The pumping spool 272 has a pressure surface 282 on one side (the left side in Figure 4) and an overhanging end on the other side (the right side in Figure 4). If a working fluid flows into the first chamber 271 and rises in the first chamber 271, the pressure surface 282 of the pumping spool 272 is pressed by the working fluid and one end 283 of the pumping spool 272 moves to the other side (the right side in Figure 4). The end 283 of the pumping spool 272 is thus placed in the second chamber 275. The pumping spool 272 has a pumping spool spring 284 and the pumping spool spring 284 serves to move the end 283 of the pumping spool 272 to one side (the left side in Figure 4), i.e., it serves to return the pumping spool 272 to the initial position using an elastic restoring force. Henceforth, the operating process of the automatic lubricant supply structure 200 of the hydraulic hammer 10 according to an illustrative embodiment of the present invention is described with reference to figures 3 to 7. When the hydraulic hammer 10 is started by starting a hydraulic pump on an excavator, the high-pressure working fluid pumped from the hydraulic pump flows into the body 100 of the hydraulic hammer 10 through the supply hose and the working fluid inlet 121. As described above, some of the high-pressure working fluid flowing in body 100 flows into the working fluid channel 126 or control valve 125 and participates in the up / down movement of the piston 124, and the other high-pressure working fluid flows into the first chamber 271 through the working fluid line 230 and the first orifice 281. When the high-pressure working fluid flows into the first chamber 271, it presses against the pressure surface 282 of the pump spool 272, so that, as shown in Figure 5, the end 283 of the pump spool 272 moves to the other side, i.e., the left side. This is because the pressure force of the high-pressure working fluid is greater than the elastic restoring force of the pump spool spring 284 of the pump spool 272. In this case, the second chamber 273 has been filled with a lubricant that has been held in the body 211 of the lubricant cartridge 210 through the injection port 213 of the lubricant cartridge 210 and the lubricant inlet 273. Consequently, as shown in Figure 5, as the end 283 of the pumping spool 272 moves to the left side, the end 283 pushes the lubricant out of the second chamber 275 and a ball 287 of the check valve 274 moves to the other side, i.e., the right side by the pressure force of the lubricant, as shown in Figure 6, thus opening the check valve 274. As the check valve 274 opens, the lubricant in the second chamber 275 flows into the lubricant line 240 through the second orifice 285 and is injected into the first orifice 111 of the front head 110 through the lubricant injection port 260, so that the lubricant is supplied between the chisel 112 and the inner surface of the front head 110, i.e., the inner surface of the first orifice 111. If, when the operation of the hydraulic hammer 10 is stopped by stopping the operation of the hydraulic pump of the excavator, the inlet flow of a high-pressure working fluid to the first chamber 271 is stopped, the end 283 of the pumping spool 272 moves to the left and returns to the initial position by the elastic restoring force of the pumping spool spring 284. As the end 283 of the pumping spool 272 returns to its initial position (the position shown in Figure 4), the pressure force of the lubricant in the second chamber 275 is removed. Consequently, the ball 287 of the check valve 274 also moves to the left and returns to its initial position (the position shown in Figures 4 and 5) due to the elastic restoring force of the check valve spring 286, thus closing the check valve 274. Therefore, the supply of lubricant through the lubricant line 240 is stopped. The hydraulic hammer 10 provided with an automatic lubricant supply structure 200 having the configuration described above according to an illustrative embodiment of the present invention has the following effects. Since the automatic lubricant supply structure 200 operates with a working fluid, lubricant is supplied only when the hydraulic hammer 10 is being operated. Consequently, it is possible to solve the problem of malfunction in hydraulic hammers of related technology where lubricant is supplied when the hydraulic hammer is not being operated, thus reducing unnecessary lubricant waste. Since the automatic lubricant supply structure 200 is arranged within the body 100 of the hydraulic hammer 10, it is possible to prevent damage to the automatic lubricant supply structure 200 from rock fragments, etc., during rock breaking, unlike hydraulic hammers of related technology. The integrated body structure of the automatic lubricant supply structure 200 is simple and utilizes the space of body 100, making it possible to manufacture a compact hydraulic hammer 10. Since the automatic lubricant supply system 200 is integrated into the body 100 of the hydraulic hammer 10, a separate hose is not required in the lubricant supply line. Therefore, only the supply and discharge hoses are needed when connecting the hydraulic hammer 10 to an excavator's hydraulic pump. Consequently, the hose structure is simplified, ensuring the unrestricted use of the hydraulic hammer 10 mounted on an excavator and guaranteeing high compatibility in the hydraulic connection between the excavator and the hydraulic hammer 10. Furthermore, it is possible to prevent a separate hose from being damaged by rocks generated when it breaks. Since the lubricant cartridge 210 supplies a lubricant that can be separated from the body 100, it is possible to simply supply a lubricant by replacing the lubricant cartridge 210. The hydraulic hammer 10 according to an illustrative embodiment of the present invention described above may further include a support 300 that is coupled to the body 100, as shown in Figures 8 to 10. The support 300 includes: a housing 310 formed on the rear surface of the support 300 and housing the cartridge coupler 220, the working fluid inlet 121 and the working fluid outlet 122 of the body 100; and a cover 330 coupled to the housing 310 and covering the cartridge coupler 220, the working fluid inlet 121 and the working fluid outlet 122. Housing 310 is placed on the rear surface of bracket 300 and a housing slot 311 is formed in the center of housing 310. The height of the housing 310 is greater than or equal to the overhanging heights of the cartridge coupler 220, the working fluid inlet 121, and the working fluid outlet 122. Consequently, as shown in Figure 9, when the support 300 is attached to the body 100, the housing 310 is placed on the rear surface of the body 100. Furthermore, since the housing groove 311 is formed, the cartridge coupler 220, the working fluid inlet 121, and the working fluid outlet 122 can be easily accommodated in the housing 310. The cover 330 is attached to the housing 310 and serves to cover the cartridge coupler 220, the working fluid inlet 121 and the working fluid outlet 122. The cover 330 has a cartridge insertion slot 331 that communicates with the body seat hole 221 of the cartridge coupler 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. When the cover 330 is attached to the housing 310, the inlet connector 333 communicates with the working fluid inlet 121 and the outlet connector 335 communicates with the working fluid outlet 122. In this case, the supply hose described above is connected to the working fluid inlet 121 and the discharge hose is connected to the working fluid outlet 122. Furthermore, when cover 330 is attached to housing 310, lubricant cartridge 210 can be inserted through cartridge insertion slot 331. Consequently, even with cover 330 attached, lubricant cartridge 210 can be easily attached to cartridge coupler 220. As described above, since the cartridge coupler 220 is formed on the rear surface of the body 100, i.e., the rear surface of the rear head 130, the housing 310 can be formed to have a position corresponding to the cylinder 120 and the rear head 130 of the body 100. Furthermore, as described above, since the cartridge coupler 220 is positioned in the same plane as the working fluid inlet 121 and the working fluid outlet 122 of the cylinder 120—that is, on the rear surface of the body 100—the cartridge coupler 220 can be easily accommodated in the housing 310 of the bracket 300. Consequently, when the bracket 300 is coupled to the body 100, the working fluid inlet 121 and the working fluid outlet 122 are prevented from being exposed outside the hydraulic hammer 10. Therefore, damage to the cartridge coupler 220, the working fluid inlet 121, and the working fluid outlet 122 is avoided. Hereafter, various modified examples of the hydraulic hammer 10 provided with the automatic lubricant supply structure 200 are described according to an illustrative embodiment of the present invention. Figure 11 is a view showing a first modified example of the hydraulic hammer provided with an automatic lubricant supply structure according to an illustrative embodiment of the present invention, and Figure 12 is a view showing a second modified example of the hydraulic hammer provided with an automatic lubricant supply structure according to an illustrative embodiment of the present invention. Although the cartridge coupler 220 of the automatic lubricant supply structure 200 is arranged in the rear head 130 in the description of the hydraulic hammer 10 provided with the automatic lubricant supply structure 200 according to an illustrative embodiment of the present invention, a cartridge coupler 220' may be arranged in the cylinder 120, as shown in Figure 11, or a cartridge coupler 220" may be arranged in the front head 110, as shown in Figure 12. A hydraulic hammer 10' according to a first modified example shown in figure 11 has a cartridge coupler 220' on cylinder 120. In this case, a working fluid line can be formed from the automatic lubricant supply structure on cylinder 120 and a lubricant line can be formed through cylinder 120 and the front head 110. In addition, a supply valve can be arranged on cylinder 120. A 10" hydraulic hammer, according to a second modified example shown in Figure 12, has a 220" cartridge coupler on the front head 110. In this case, a working fluid line can be formed from the automatic lubricant supply structure through the cylinder 120 and the front head 110, and a lubricant line can be formed on the front head 110. In addition, a supply valve can be arranged on the front head 110. Although cartridge couplers 220, 220' and 220" are positioned only on the rear surface of body 100 in the embodiment description and in the modified examples, cartridge couplers 220, 220' and 220" can be positioned on the front surface, right surface, left surface, top surface and bottom surface, depending on the design, use, etc. of hydraulic hammers 10, 10' and 10". Although the present invention has been described through preferred embodiments, those skilled in the art may change or modify the present invention in various ways within a range that does not depart from the spirit and scope of the present invention described in the following claims. <Descripción de los números de referencia en los dibujos> 10, 10', 10": hydraulic hammer 100: body 110: front head 111: first hole 112: chisel 120: cylinder 121: working fluid inlet 122: working fluid outlet 123: second orifice 124: piston 124a: lower chamber 124b: upper chamber 125: control valve 126: working fluid channel 130: rear head 131: gas chamber 200: Automatic lubricant supply structure 210: Lubricant cartridge 211: body 213: injection port 220: cartridge coupler 221: body seat hole 223: Injection port seat hole 230: Working fluid line 240: lubricant line 250: supply valve 260: lubricant injection port 271: first chamber 272: pumping reel 273: lubricant inlet 274: check valve 275: second chamber 281: first hole 282: pressure surface 283: end 284: pump spool spring 285: second hole 286: check valve spring 287: ball 300: support 310: housing 311: housing slot 330: cover 331: Cartridge insertion slot 333: Input connector 335: output connector

Claims

1. A hydraulic hammer comprising: a support (300); a body (100) coupled to an interior of the support (300); a piston (124) provided in the body (100) and oscillating by means of a working fluid; a chisel (112) provided in the body (100) and configured to be struck by the piston (124); a cartridge coupler (220) to which a lubricant cartridge (210) is detachably coupled; a working fluid inlet (121), connected to a hydraulic pump by a supply hose, wherein a high-pressure working fluid, supplied from the hydraulic pump through the supply hose, flows into the working fluid inlet (121); a working fluid outlet (122), connected to a hydraulic reservoir by a discharge hose,wherein a low-pressure working fluid discharged from the working fluid outlet (122) through the discharge hose flows into the hydraulic reservoir; an automatic lubricant supply structure (200), which is configured to supply a lubricant from the lubricant cartridge (210) using the working fluid; and a supply valve (250), which is configured to supply the lubricant to the lubricant injection port (260), in response to a working fluid pressure, 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),arranged in the body (100) and configured to supply lubricant to the lubricant injection port (260), the lubricant line (240) having one end communicating with the supply valve (250) and the other end communicating with the lubricant injection port (260).

2. The hydraulic hammer of claim 1, wherein the supply valve includes: a first chamber (271) having a first orifice (281) communicating with the working fluid line and filled with the working fluid through the first orifice (281); a second chamber (275) communicating with a lubricant inlet (273) and filled with lubricant from 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 working fluid loaded into the first chamber (271),so that the pumping spool (272) pushes the loaded lubricant into the second chamber (275); and a check valve (274), provided on one side of the second chamber (275) and having a second orifice (285) communicating 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 pressure from the loaded lubricant in the second chamber (275).

3. The hydraulic hammer of claim 1 or 2, wherein the body includes a cylinder (120), a front head (110) disposed below the cylinder, and a rear head (130) disposed above the cylinder (120), the cartridge coupler (220) being disposed on the rear head, and the cartridge coupler (220) being positioned in the same plane as the working fluid inlet (121) of the cylinder (120).

4. The hydraulic hammer of claim 2 or 3,wherein the working fluid inlet (121) and a working fluid outlet (122) of the body are housed in the casing (310); and the cover (330) covers the working fluid inlet (121) and the working fluid outlet (122).

5. The hydraulic hammer of claim 4, wherein the cover (330) has a cartridge insertion slot (331) communicating with a cartridge coupler body seat hole (220, 220', 220"), an inlet connector (333) communicating with the working fluid inlet (121), and an outlet connector (335) communicating with the working fluid outlet (122).

6. The hydraulic hammer of claims 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 flush surface of the support (300) to be placed on the rear surface of the body when the support (300) is coupled to the body (100).

7. The hydraulic hammer of claim 6, wherein a height of the housing (310) is greater than or equal to the projecting heights of the cartridge coupler (220, 220', 220"), the working fluid inlet (121), and the working fluid outlet (122).

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