JP2010164023A - Hydraulic passage structure of hydraulic cylinder block - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic passage structure of a hydraulic cylinder block having a plurality of hydraulic cylinders in which hydraulic passages allowing hydraulic cylinders to communicate with each other can be easily formed. <P>SOLUTION: In this hydraulic passage structure of a hydraulic cylinder block in which the plurality of hydraulic cylinders 43 are formed and the hydraulic cylinders communicate with each other through the hydraulic passages, the hydraulic cylinder block 40 comprises an outer hydraulic cylinder block 41 and an inner hydraulic cylinder block 42. The plurality of hydraulic cylinders 43 and first hydraulic passage 65 one ends of which are opened to each hydraulic cylinder and the other ends of which are opened to the outer peripheral surface thereof are formed in the inner hydraulic cylinder block, and second hydraulic passages 69 communicating with each first hydraulic passage are formed between the outer hydraulic cylinder block and the inner hydraulic cylinder block. Third hydraulic passages 61, 62, 63 one ends of which are opened to the second hydraulic passages and the other ends of which are opened to the outer peripheral surface thereof are formed in the outer hydraulic cylinder block. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hydraulic passage structure of a hydraulic cylinder block.

  As a valve device for an internal combustion engine, for example, a diesel engine, for example, an exhaust valve device, there is an exhaust valve device 10 as shown in FIG. The exhaust valve device 10 is attached to, for example, a valve seat 2 of the cylinder block 1.

  The exhaust valve device 10 includes an exhaust valve (hereinafter referred to as a main valve) 21 that performs exhaust, a high-temperature exhaust passage 12 for high-temperature gas and a low-temperature exhaust passage 13 for low-temperature gas, and a high-temperature exhaust passage 12. The auxiliary valve 25 for switching the flow of combustion gas to the low temperature exhaust passage 13, the hydraulic cylinder 28 provided in the casing 15 for opening the main valve 21, and the auxiliary valve 25 provided in the hydraulic cylinder block 17. A plurality of, for example, three hydraulic cylinders 30 that perform the switching operation, a main valve air piston 23 that is fixed to the upper portion of the valve stem 22 of the main valve 21 and performs a recovery operation of the main valve 21, and a sub valve 25 A sub-valve air piston 27 that is fixed to the upper portion of the valve stem 26 and performs the restoring operation of the sub-valve 25 and an air spring chamber 29 that accommodates these air pistons 23 and 27 and applies air pressure are formed. It has a configuration that includes a casing 16 that.

  In addition, the exhaust valve apparatus 10 as an example has shown the case where it applies to a 2-cycle uniflow type diesel engine. The two-cycle uniflow type diesel engine has, for example, an intake port (scavenging port) on the side wall of the cylinder liner, and the main valve 21 performs only exhaust.

  The valve opening operation of the main valve 21 is performed by pushing the valve stem 22 downward in the figure by a hydraulic cylinder 28 that is operated by high-pressure oil pressure. Further, the valve closing operation (restoring operation) is performed by the main valve air piston 23 attached to the valve stem 22 pulling the valve stem 22 upward in the drawing. That is, the air pressure in the air spring chamber 29 formed below the main valve air piston 23 is the operating source for the valve closing operation of the main valve 21.

  The switching operation of the sub-valve 25 is performed by a plurality of hydraulic cylinders 30 provided in the hydraulic cylinder block 17 being operated by high-pressure oil pressure so as to be concentric with the valve stem 22 of the main valve 21 and slidable in the axial direction. The auxiliary valve air piston 27 attached to the fitted valve stem 26 is pushed upward in the figure.

  Further, the recovery operation is performed by releasing the hydraulic pressure of the plurality of hydraulic cylinders 30 and pushing the valve stem 26 downward in the figure by the auxiliary valve air piston 27 attached to the valve stem 26. That is, the air pressure in the air spring chamber 29 formed above the auxiliary valve air piston 27 is the operating source of the recovery operation of the auxiliary valve 25. An exhaust valve device provided with such a sub valve is disclosed in, for example, Japanese Patent Application Laid-Open No. 2008-248720 (see, for example, Patent Document 1).

  The sub valve 25 is held at the illustrated position in the initial stage of exhaust when the main valve 21 starts to open during exhaust, and discharges the high temperature exhaust gas to the high temperature exhaust passage 12, and the illustrated position after the middle stage of exhaust. And is switched to the low temperature exhaust passage 13 side and discharged to the low temperature exhaust passage 13.

JP 2008-248720 A (page 3, FIG. 2)

  In the hydraulic passage structure of the conventional hydraulic cylinder block described above, a plurality (three) of hydraulic cylinders 30 of the hydraulic cylinder block 17 are formed perpendicularly from the upper end surface of the hydraulic cylinder block 17, as shown in FIG. In addition, the bottom is communicated with hydraulic passages 31 to 34 that are drilled horizontally from the side surface 17a.

  These hydraulic passages 31 to 34 are formed perpendicular to the hydraulic passage 35 formed in the upper portion of the side surface 17 a of the hydraulic cylinder block 17 and the hydraulic cylinder 30, and one end (upper end) communicates with the hydraulic passage 35. In addition, the other end communicates with a hydraulic passage 36 that communicates with the hydraulic passages 31 and 34.

  However, since the hydraulic passages 31 to 36 of the hydraulic cylinder block 17 are formed by machining (drilling), machining is complicated, and returning (bending) or cutting powder (cutting) at the time of drilling is performed. Is difficult to eliminate, and a great deal of labor and cost are required for the subsequent processing. Further, if even a small amount of cutting powder (chip) remains in the hydraulic passage, there is a risk of causing a sliding failure of the hydraulic cylinder.

  The present invention has been made to solve such a problem, and facilitates machining (drilling hole machining) of a hydraulic passage for communicating each hydraulic cylinder, as well as returning (bending) generated during machining. It is possible to improve the workability of the cutting powder (chip) removal processing work. In addition, the finishing inspection of the hydraulic cylinder block can be facilitated, and the cost can be reduced. In this way, the return of the hydraulic passage (bending) and the removal of cutting powder (cutting chips) can be facilitated to prevent the sliding failure of the hydraulic cylinder caused by cutting powder and improve the reliability. It is an object to provide a hydraulic passage structure of a hydraulic cylinder block that can be achieved.

  In order to solve the above problems, the present invention employs a plurality of bottomed hydraulic cylinders on one end face of the hydraulic cylinder block, and each hydraulic cylinder communicates with a hydraulic passage formed in the hydraulic cylinder block. In the hydraulic passage structure of the hydraulic cylinder block, the hydraulic cylinder block includes an outer hydraulic cylinder block and an inner hydraulic cylinder block that is liquid-tightly fitted in the outer hydraulic cylinder block. A hydraulic cylinder and a first hydraulic passage having one end opened to each hydraulic cylinder and the other end opened to the outer peripheral surface of the inner hydraulic cylinder are formed between the outer hydraulic cylinder block and the inner hydraulic cylinder block. A second hydraulic passage communicating with each first hydraulic passage is formed, and one end of the second hydraulic passage is connected to the outer hydraulic cylinder block. The other end while opened to the hydraulic passage is that the formation of the third hydraulic passage that opens to the outer peripheral surface of the outer hydraulic cylinder block.

  According to the hydraulic passage structure of the hydraulic cylinder block of the present invention, the hydraulic cylinder block is formed of the outer hydraulic cylinder block and the inner hydraulic cylinder block fitted in the outer hydraulic cylinder block, and a plurality of inner hydraulic cylinder blocks are provided in the inner hydraulic cylinder block. The first hydraulic passage can be shortened because the hydraulic cylinder and the first hydraulic passage having one end opened to each hydraulic cylinder and the other end opened to the outer peripheral surface of the inner hydraulic cylinder block are formed. Thus, the machining (drilling) of the first hydraulic passage is facilitated, and the return (cutting) and cutting powder (swarf) generated during the drilling are also easily removed.

  Further, since the second hydraulic passages communicating with the respective first hydraulic passages are formed between the outer hydraulic cylinder block and the inner hydraulic cylinder block, the processing of the second hydraulic passage is facilitated. Further, the third hydraulic passage is machined because one end of the outer hydraulic cylinder block communicates with the second hydraulic passage and the other end opens on the outer peripheral surface of the outer hydraulic cylinder block. (Cream drilling) becomes easy, and the removal (bending) and cutting powder generated during drilling are also facilitated.

  That is, by dividing the hydraulic cylinder block into an outer hydraulic cylinder block and an inner hydraulic cylinder block, machining (drilling) of the hydraulic passage becomes extremely easy and occurs during machining (drilling). It is possible to improve the workability of the removal process of turning back (bending) and cutting powder (chip).

  In the hydraulic passage structure of the above hydraulic cylinder block, the outer hydraulic cylinder block has a bottomed cylindrical shape, the inner hydraulic cylinder block has a cylindrical shape, and a plurality of hydraulic cylinders are spaced apart from the inner hydraulic cylinder block along the circumferential direction. Preferably, each first hydraulic passage is formed radially from each hydraulic cylinder, and the second hydraulic passage is preferably annular.

  In this way, a cylindrical inner hydraulic cylinder block is fitted in the outer hydraulic cylinder block having a bottomed cylindrical shape, and a plurality of hydraulic cylinders are formed in the inner hydraulic cylinder block at intervals along the circumferential direction, By forming each first hydraulic passage radially from each hydraulic cylinder and forming the second hydraulic passage annularly, the processing of the outer hydraulic cylinder block and the inner hydraulic cylinder block becomes extremely easy.

  In addition, by forming the first hydraulic passage formed in the inner hydraulic cylinder block radially from the hydraulic cylinder toward the outer peripheral surface of the inner hydraulic cylinder block, the hydraulic passage can be shortened and a drill hole is formed. Processing becomes easy. In addition, it is easy to remove the burr and cutting powder generated during drilling. In addition, by forming the second hydraulic passage in an annular shape, communication with each of the first hydraulic passages formed in a radial shape is facilitated, and processing thereof is also facilitated.

  In the hydraulic passage structure of the hydraulic cylinder block, the second hydraulic passage is formed by concentrically concaving the outer peripheral surface on the bottom side of the cylindrical inner hydraulic cylinder block in an annular shape. It is desirable to form an annular hydraulic passage between the surface.

  In this way, the outer peripheral surface on the bottom side of the cylindrical inner hydraulic cylinder block is concentrically recessed in an annular shape, and an annular hydraulic passage is formed between the inner peripheral surface of the outer hydraulic cylinder block, and this annular By using the second hydraulic passage as the second hydraulic passage, machining of the second hydraulic passage is facilitated.

  In the hydraulic passage structure of the hydraulic cylinder block, it is desirable that one end of the first hydraulic passage is open to the inner peripheral surface on the bottom side of the hydraulic cylinder.

  Thus, the first hydraulic passage can be shortened by opening the first hydraulic passage that connects each hydraulic cylinder and the second hydraulic passage to the inner peripheral surface of the bottom side of the hydraulic cylinder. At the same time, the drilling of the first hydraulic passage is facilitated, and the return or turning powder generated during drilling is also easily removed.

  In the hydraulic passage structure of the hydraulic cylinder block, for example, the hydraulic cylinder block is an exhaust valve box of a diesel engine, and the diesel engine is mounted on a valve seat and exhausts, and an exhaust valve box And a sub-valve that switches between opening and closing of an exhaust passage for high-temperature gas and an exhaust passage 13 for low-temperature gas that extend to branch to the downstream side of the main valve.

  In particular, in a diesel engine having a sub valve in an exhaust valve box, a complicated hydraulic passage for driving the hydraulic cylinder for operating the sub valve is required. Therefore, the effects of the present invention can be optimally achieved.

  As described above, in the hydraulic passage structure of the hydraulic cylinder block according to the present invention, a plurality of bottomed hydraulic cylinders are formed on one end face of the hydraulic cylinder block, and each hydraulic cylinder communicates with the hydraulic passage formed in the hydraulic cylinder block. In the hydraulic passage structure of the hydraulic cylinder block, the hydraulic cylinder block includes an outer hydraulic cylinder block and an inner hydraulic cylinder block that is liquid-tightly fitted in the outer hydraulic cylinder block. A hydraulic cylinder and a first hydraulic passage having one end opened to each hydraulic cylinder and the other end opened to the outer peripheral surface of the inner hydraulic cylinder are formed between the outer hydraulic cylinder block and the inner hydraulic cylinder block. A second hydraulic passage communicating with the first hydraulic passage is formed, and one end of the second hydraulic passage is connected to the outer hydraulic cylinder block. The other end with an opening in the hydraulic passage to form a third hydraulic passage that opens to the outer peripheral surface of the outer hydraulic cylinder block.

  Therefore, by dividing the hydraulic cylinder block in which a plurality of hydraulic cylinders are formed into an outer hydraulic cylinder block and an inner hydraulic cylinder block, machining of the hydraulic passages for communicating each hydraulic cylinder (drilling) is easy. In addition, there is an excellent effect that it is possible to improve the workability of the removal (bending) and cutting powder (chip) removal work that occurs during machining.

  As a result, the finished inspection of the hydraulic cylinder block can be easily performed and the cost can be reduced. Further, as described above, it is easy to return the hydraulic passage and to remove the cutting powder (chip). As a result, it becomes possible to prevent a sliding failure of the hydraulic cylinder caused by the cutting powder, and it is possible to improve the reliability.

It is sectional drawing of the exhaust valve apparatus of the diesel engine to which the hydraulic passage structure of the hydraulic cylinder block which concerns on one Embodiment of this invention is applied. It is sectional drawing which follows the arrow line II-II of the exhaust valve apparatus shown in FIG. It is sectional drawing in a different position from FIG. 2 of the exhaust valve apparatus shown in FIG. It is sectional drawing which follows the arrow line IV-IV of the exhaust valve apparatus shown in FIG. FIG. 3 is a partially enlarged view of the hydraulic cylinder shown in FIG. 2. It is sectional drawing of the exhaust valve apparatus of the conventional diesel engine. It is sectional drawing which follows the arrow VII-VII of the exhaust valve apparatus shown in FIG.

  An embodiment for carrying out the invention of a hydraulic passage structure of a hydraulic cylinder block according to the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a cross-sectional view of a main part when the hydraulic cylinder block according to the present invention is applied to the exhaust valve device 10 shown in FIG. 1 to 5, the same members as those of the exhaust valve device 10 shown in FIG.

  The hydraulic cylinder block is an exhaust valve box 11 of a diesel engine as an example. The diesel engine is disposed in the valve seat 2 of the cylinder block 1 and exhausts in the exhaust valve box 11. A sub-valve 25 is provided that switches between opening and closing of the exhaust passage 12 for high-temperature gas and the exhaust passage 13 for low-temperature gas. In this diesel engine, a sub valve 25 is provided in the exhaust valve box 11, and a hydraulic passage for driving them is provided for a hydraulic cylinder 43 that operates the sub valve 25.

  As shown in FIG. 1, the hydraulic cylinder block 40 for performing the switching operation of the auxiliary valve 25 has a cylindrical shape, and is formed by an outer hydraulic cylinder block 41 and an inner hydraulic cylinder block 42. The outer hydraulic cylinder block 41 has a bottomed cylindrical shape, and the inner hydraulic cylinder block 42 has a cylindrical shape. At the center of the bottom of the outer hydraulic cylinder block 41 and the center of the inner hydraulic cylinder block 42, holes 41 a and 42 a are inserted through the valve stem 22 of the main valve 21 and the valve stem 26 of the sub valve 25.

  In the outer hydraulic cylinder block 41, a hydraulic passage 61 is formed vertically along the axial direction from the upper end surface 41d, and a hydraulic passage 62 is formed radially above the side surface (outer peripheral surface) 41b. One end (front end) of the hydraulic passage 62 communicates with the upper portion of the hydraulic passage 61 and the other end opens to the outer peripheral surface 41b to serve as a hydraulic supply and discharge port. The hydraulic passage 61 is closed at the open end (upper end in the figure).

  Further, a hydraulic passage 63 is formed in the radial direction near the bottom of the outer peripheral surface 41b, and the lower end of the vertical hydraulic passage 61 is opened and communicated in the middle, and one end (tip) is the outer hydraulic cylinder block. 41 is open to the inner peripheral surface 41c. These hydraulic passages 61, 62, 63 are formed by drilling (machining). The open end of the outer peripheral surface 41b of the hydraulic passage 63 is closed.

  These hydraulic passages 61, 62, and 63 form a third hydraulic passage. The hydraulic passages 61, 62, and 63 are short and simple in structure, and can easily remove the return (bending) and cutting powder (chip) generated during machining (drilling). Easy to process.

  The vertical hydraulic passage 61 and the upper hydraulic passage 62 described above are eliminated, and only the hydraulic passage 63 near the bottom is provided. The outer peripheral surface 41b of the hydraulic passage 63 is opened to serve as a hydraulic supply and discharge port. The passage may be a third hydraulic passage. In this way, the hydraulic passage 63, that is, the third hydraulic passage can be made extremely short and the structure thereof can be made extremely simple. Accordingly, the return generated during machining (drilling) is turned up. And cutting powder (chip) can be removed more easily and satisfactorily, and post-treatment is easier.

  As shown in FIGS. 2 and 4, the inner hydraulic cylinder block 42 is concentric to the outer side of the central hole 42a on the upper end surface and at equal intervals along the circumferential direction on the same circumference. A plurality of, for example, three are formed.

  These hydraulic cylinders 43 are bottomed, and a hydraulic passage 65 (only one is shown in FIG. 2) is formed near the bottom. One end of the hydraulic passage 65 opens in the inner peripheral surface near the bottom of the hydraulic cylinder 43, and the other end opens in the outer peripheral surface 42b (see FIG. 1) of the inner hydraulic cylinder block 42. Is formed.

  The hydraulic passage 65 is also formed by drilling (machining). The hydraulic passage 65 is extremely short and has a simple structure, and can easily remove the return (bending) and cutting powder (cutting powder) generated during drilling and can be easily post-processed. The hydraulic passage 65 is a first hydraulic passage.

  At the lower end of the outer peripheral surface 42b of the inner hydraulic cylinder block 42, an annular recess 45 is formed over the entire circumference. The other end of the hydraulic passage 65 opens at the bottom surface of the annular recess 45. Thereby, the lower part of each hydraulic cylinder 43 is communicated with the recess 45.

  As shown in FIGS. 2 and 4, the inner hydraulic cylinder block 42 has a plurality of, for example, three hydraulic cylinders 46 formed on the upper end surface on the same circumference as the hydraulic cylinder 43 and at equal intervals along the circumferential direction. Has been. These three hydraulic cylinders 46 are alternately arranged between the three hydraulic cylinders 30 and are shallower than the hydraulic cylinder 43 (for example, a depth of about 1/3). As shown in FIG. 5, the hydraulic cylinder 46 has a cylinder liner fixed to the upper end surface of the inner hydraulic cylinder block 42 by a bolt 48.

  As shown in FIG. 2, an annular groove 66 is formed on the outer peripheral surface 42 b of the inner hydraulic cylinder block 42 at a position corresponding to the bottom of the hydraulic cylinder 46 over the entire circumference. A hydraulic passage 67 (only one is shown in FIG. 2) is formed in the vicinity of the bottom of these hydraulic cylinders 46. The hydraulic passage 67 is formed radially in the radial direction, and one end opens on the inner peripheral surface near the bottom of the hydraulic cylinder 46 and the other end opens on the bottom surface of the annular groove 66. Thereby, the lower part of each hydraulic cylinder 46 is communicated with the annular groove 66.

  The hydraulic passage 67 is also formed by drilling (machining). The hydraulic passage 67 is extremely short and has a simple structure like the hydraulic passage 65, and can easily remove the return (bending) and cutting powder (chip) generated during drilling. Easy to process.

  As shown in FIG. 2, a hydraulic passage 68 is formed in the outer hydraulic cylinder block 41 at a position corresponding to the annular groove 66 of the inner hydraulic cylinder block 42, and communicates with the annular groove 66.

  The inner hydraulic cylinder block 42 is liquid-tightly fitted into the outer hydraulic cylinder block 41 via a seal member, and is fastened together with the exhaust valve box 11 with bolts 75 as shown in FIG. An annular hydraulic passage 69 is formed between the annular recess 45 at the lower end of the inner hydraulic cylinder block 42 and the inner peripheral surface facing the outer hydraulic cylinder block 41. This annular hydraulic passage 69 serves as a second hydraulic passage. In this way, the hydraulic cylinder block 40 is formed.

  As shown in FIG. 2, each front end surface (upper end surface in the figure) of the piston 44 of each hydraulic cylinder 43 is in contact with the lower surface of the sub valve air piston 27. The three hydraulic cylinders 43 form a sub valve switching device 51 that switches the sub valve 25.

  As shown in FIG. 2, each tip surface (upper surface in the drawing) of the piston 47 of each hydraulic cylinder 46 is in contact with the lower surface of the sub valve air piston 27. These three hydraulic cylinders 46 form a zero point position control device 52 that regulates the lower limit position (zero point position) when the sub valve 25 is lowered by the recovery operation.

  The opening part opened to the outer peripheral surface 41b of the hydraulic passage 62 of the outer hydraulic cylinder block 41 shown in FIG. 1 serves as a hydraulic supply and discharge port, and is connected to a hydraulic source (not shown) to connect the auxiliary valve switching device 51. To drive. Further, the hydraulic passage 68 of the outer hydraulic cylinder block 41 shown in FIG. 2 has an opening that opens to the outer peripheral surface 41 b as a hydraulic supply and discharge port, and is connected to a hydraulic source (not shown) via the hydraulic passage 70. Then, the zero point position control device 52 is driven.

  This zero point position control device 52 detects the hydraulic pressure P of the hydraulic cylinder 46 by the hydraulic sensor 55 provided in the hydraulic passage 68, and the auxiliary valve breakage prevention device (not shown) connected to the hydraulic sensor 55 detects the hydraulic pressure sensor. When the hydraulic pressure exceeds a predetermined pressure, it is determined that the lower end surface 25a of the sub valve 25 is seated (collised) with the upper end surface 2a of the valve seat 2 of the main valve 21, and the detected value level at that time is reached. In response, the warning light is turned on (warning is generated) and the internal combustion engine is stopped.

  As shown in FIGS. 1 and 2, when the main valve 21 is closed, the hydraulic cylinder 43 of the auxiliary valve switching device 51 is retracted, and the auxiliary valve 25 is operated by the hydraulic cylinder 43 and the zero point position control device 52. Is held at the zero point position (lower limit position). Then, at the initial stage of exhaust when the main valve 21 is slightly opened, the sub valve 25 is still held at the zero point position (lower limit position), and the high temperature exhaust gas is used for the high temperature gas as shown by the arrow in FIG. To the exhaust passage 12.

  As shown in FIG. 3, when the opening of the main valve 21 progresses and the initial stage of exhaust passes, the hydraulic cylinder 43 of the auxiliary valve switching device 51 extends to push the air piston 27 upward in the drawing, 25 is switched to the low-temperature gas exhaust passage 13 side, and the remaining exhaust gas is discharged to the low-temperature gas exhaust passage 13 as indicated by an arrow.

  When the exhaust is completed, the hydraulic cylinder 43 of the sub valve switching device 51 is retracted, and the sub valve 25 is pushed downward in the figure by the air piston 27. Then, as shown in FIG. 2, the air piston 27 comes into contact with the piston 47 of the hydraulic cylinder 46 of the zero position control device 52 and the lowering is restricted, and the sub valve 25 is held at the zero position (lower limit position).

  The present invention is not limited to the exhaust valve device for a diesel engine according to the above-described embodiment, and can be implemented for various internal combustion engines and hydraulic equipment.

DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Valve seat 2a Upper end surface 10 Exhaust valve device 11 Exhaust valve box 12 Exhaust passage 13 for high temperature gas Exhaust passage 15 for low temperature gas Casing 16 Casing 17 Hydraulic cylinder block 17a Side surface 21 Main valve 22 Valve stem 23 Air piston 25 Sub valve 26 Valve stem 27 Air piston 28 Hydraulic cylinder 29 Air spring chamber 30 Hydraulic cylinder 31, 32, 33, 34, 35, 36 Hydraulic passage 40 Hydraulic cylinder block 41 Outer hydraulic cylinder block 41a Hole 41b Outer peripheral surface 41c Inner peripheral surface 41d Upper end surface 42 Inner hydraulic cylinder block 42a Hole 42b Outer peripheral surface 43 Hydraulic cylinder 44 Piston 45 Annular recess 46 Hydraulic cylinder 47 Piston 48 Bolt 51 Sub valve switching device 52 Zero position control device 55 Pressure sensors 61, 62, 63, 65 Hydraulic pressure Passage 66 Shaped groove 67,68,70 of the hydraulic passage 69 annular hydraulic passage 75 volts P hydraulic

Claims (5)

  A plurality of bottomed hydraulic cylinders (43) are formed on one end face of the hydraulic cylinder block (40), and each of the hydraulic cylinders has a hydraulic passage (61, 62, 63, 65, 66, 69 formed in the hydraulic cylinder block). ), The hydraulic cylinder block includes an outer hydraulic cylinder block (41), and an inner hydraulic cylinder block (42) fitted in the outer hydraulic cylinder block in a liquid-tight manner. A plurality of hydraulic cylinders in the inner hydraulic cylinder block, and a first hydraulic passage (65) having one end opened in each hydraulic cylinder and the other end opened in the outer peripheral surface (42b) of the inner hydraulic cylinder. And each of the first hydraulic passages is connected between the outer hydraulic cylinder block and the inner hydraulic cylinder block. A second hydraulic passage (69) is formed, one end of the outer hydraulic cylinder block is opened to the second hydraulic passage, and the other end is opened to the outer peripheral surface (41b) of the outer hydraulic cylinder block. The hydraulic passage structure of the hydraulic cylinder block is characterized in that the hydraulic passages (61, 62, 63) are formed.   The outer hydraulic cylinder block (41) has a bottomed cylindrical shape, the inner hydraulic cylinder block (42) has a columnar shape, and the plurality of hydraulic cylinders (43) are circumferential with respect to the inner hydraulic cylinder block. The first hydraulic passages (65) are formed radially from the respective hydraulic cylinders, and the second hydraulic passages (69) are annular. The hydraulic passage structure of a hydraulic cylinder block according to claim 1.   The second hydraulic passage (69) has a cylindrical outer peripheral surface 42b on the bottom side of the inner hydraulic cylinder block (42) concentrically recessed in an annular shape, and the inner peripheral surface of the outer hydraulic cylinder block (41). The hydraulic passage structure of the hydraulic cylinder block according to claim 1 or 2, wherein the hydraulic passage structure is formed in an annular shape with the surface.   The hydraulic cylinder block according to any one of claims 1 to 3, wherein one end of the first hydraulic passage (65) is open to an inner peripheral surface on a bottom side of the hydraulic cylinder (43). Hydraulic passage structure.   The hydraulic cylinder block is an exhaust valve box (11) of a diesel engine. The diesel engine is installed in a valve seat (2) and exhausts the main valve (21) and disposed in the front exhaust valve box. And a sub-valve (25) that switches between opening and closing of a hot gas exhaust passage (12) and a cold gas exhaust passage (13) that branch off to the downstream side of the main valve. The hydraulic passage structure of a hydraulic cylinder block according to any one of claims 1 to 4.

Images