JP2010052596A - Rotation device of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain an excellent sealing property of a floating seal by crushing foreign matter solidified in a gap between a fixed body and a rotating body. <P>SOLUTION: A fixed body side projection part 23 projecting toward an axial direction end face 15E of a roller 15 is provided in an axial direction end face 12C of a shaft support member 12. First and second rotating body side projecting parts 24 and 25 projecting toward the axial direction end face 12C of the shaft support member 12 are provided in the axial direction end face 15E of the roller 15. As a result, the foreign matter solidified by being adhered to the axial direction end face 12C of the shaft support member 12 can be crushed by the first and second rotating body side projection parts 24 and 25 since the first and second rotating body side projecting parts 24 and 25 rotate with a shaft center O of the roller 15 as a center, the foreign matter solidified by being adhered to the axial direction end face 15E of the roller 15 can be crushed by the fixed body side projection part 23, and the excellent sealing property of the floating seal 18 can be maintained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a crawler guide roller used in construction machines such as a hydraulic excavator and a hydraulic crane, and a rotating device such as a traveling device.

  Generally, a lower traveling body of a tracked vehicle such as a hydraulic excavator includes a track frame having left and right side frames, a traveling device provided on one end side of each side frame, and an idler wheel provided on the other end side. The crawler belt wound around the drive wheel (sprocket) and the idler wheel of the traveling device, and the upper and lower crawler belt guide rollers for guiding the crawler belt toward the drive wheel and the idler wheel are roughly constituted. The traveling device, idle wheels, crawler belt guide rollers, and the like described above constitute a rotating device for the construction machine.

  Here, the crawler belt guide roller is usually provided with a shaft support member (fixed body) fixed to the side frame, a roller (rotary body) rotatably supported by the shaft support member via a shaft, and these It is comprised by the floating seal | sticker which seals the clearance gap formed between the shaft supporting member and the roller. In this case, the floating seal is constituted by a pair of seal rings having seal surfaces that are in sliding contact with each other, and a pair of O-rings provided between the fixed body, the rotating body, and each of the seal rings. On the other hand, when the rotating body rotates, the gap between the two is sealed in a liquid-tight manner.

  By the way, since an annular gap that opens to the outside is formed between the fixed body and the rotating body, foreign substances such as earth and sand and muddy water enter from the outside toward the floating seal through the gap. There is a problem that the floating seal is damaged by foreign matters such as earth and sand.

  In contrast, a refractive path is provided in the gap between the shaft support member (fixed body) and the roller (rotating body) constituting the crawler track guide roller of the tracked vehicle, and a filler such as grease is provided in the refractive path. There has been proposed a crawler belt guide roller that prevents foreign matter such as earth and sand from entering the gap by filling (for example, see Patent Document 1).

Japanese Utility Model Publication No. 6-51082

  However, in the prior art according to Patent Document 1, the filler filled in the refractive path is discharged early due to muddy water or the like entering the gap between the fixed body and the rotating body. For this reason, there exists a problem that the sealing performance of a floating seal will fall when foreign materials, such as earth and sand, penetrate | invade into the sealing surface of a floating seal through a refractive path.

  On the other hand, as another prior art, an O-ring is provided at an intermediate portion of a gap formed between a machine body side casing (fixed body) and a sprocket side casing (rotating body) constituting a traveling device for a tracked vehicle. And what suppresses invasion of earth and sand by this O-ring is proposed (for example, refer to patent documents 2).

Japanese Patent No. 2939924

  However, in the prior art according to Patent Document 2, earth and sand that have entered the gap between the fixed body and the rotating body easily collect around the O-ring, and the earth and sand adhere to the O-ring and solidify. There exists a malfunction that the softness | flexibility of an O-ring falls and a sealing function is impaired.

  As still another conventional technique, a scraper is provided in a fixed casing (fixed body) that constitutes a traveling device for a tracked vehicle, and a gap between the rotating casing (rotary body) and the fixed body is provided by the scraper. Some have been proposed to remove earth and sand that have entered the inside (see, for example, Patent Document 3).

JP 2007-1540 A

  However, in the conventional technique according to Patent Document 3, when the rotating body rotates with respect to the fixed body, the earth and sand that have entered the gap between the two are removed by a scraper provided in the fixed body. There is a problem that it is difficult to remove earth and sand adhering to the body with a scraper.

  For this reason, there is a problem that foreign matter such as earth and sand adhering to the fixed body is solidified without being removed, and the O-ring is deformed by the solidified foreign matter, whereby the sealing performance of the floating seal is lowered.

  The present invention has been made in view of the above-described problems of the prior art, and can crush foreign matter solidified in the gap between the fixed body and the rotating body, and can maintain the good sealing performance of the floating seal over a long period of time. An object of the present invention is to provide a rotating device for a construction machine.

  In order to solve the above-described problems, the present invention provides a fixed body that is fixed to a vehicle body of a construction machine, and an outer circumferential gap that opens to the outside between the fixed body and the fixed body. A rotating body provided rotatably, and a floating seal that seals a gap between the fixed body and the rotating body, wherein the floating seal includes an inner peripheral side of the fixed body and an inner peripheral side of the rotating body. A pair of seal rings having seal surfaces that are in sliding contact with each other, and provided between the inner peripheral surface of the fixed body and the seal ring and between the inner peripheral surface of the rotating body and the seal ring, respectively. The present invention is applied to a construction machine rotating device constituted by a pair of O-rings.

  A feature of the configuration adopted by the invention of claim 1 is that a surface of the fixed body that is located in the vicinity of the O-ring and faces the rotating body in the axial direction protrudes toward the rotating body. A fixed body-side protrusion is provided, and a surface of the rotating body that is positioned in the vicinity of the O-ring and that faces the fixed body in the axial direction is different from the fixed body-side protrusion in the radial direction. Rotating body side protrusions that protrude toward the surface are provided.

  According to a second aspect of the present invention, the surfaces of the fixed body side protrusion and the rotating body side protrusion are provided with a hard portion by performing a surface modification treatment.

  According to a third aspect of the present invention, the fixed body side protrusion is disposed in an arc shape within a range of a fixed angle with respect to the axial center of the rotating body, and the rotating body side protruding portion sandwiches the axial center of the rotating body. The configuration is such that the fixed body side protruding portion is arranged in an arc shape within a range of a constant angle while facing the protruding portion.

  According to a fourth aspect of the present invention, the fixed body side protrusion and the rotating body side protrusion are formed in a crescent shape in which both end portions in the length direction are acute angle portions and the width dimension of the center portion in the length direction is large. is there.

  According to a fifth aspect of the present invention, the upper surface of the fixed body side protrusion that faces the rotating body is formed in a mountain shape having a large height at the center in the length direction, and the fixed body of the rotating body side protrusion is fixed. The upper surface facing the body is formed in a mountain shape having a large height at the center in the length direction.

  According to a sixth aspect of the present invention, each of the fixed body-side protrusion and the rotating body-side protrusion is composed of a plurality of rod-like protrusions arranged in an annular shape around the axial center of the rotating body.

  According to the first aspect of the present invention, foreign matter such as earth and sand and muddy water entering through the gap between the fixed body and the rotating body adheres to the surface of the fixed body and the rotating body located near the O-ring of the floating seal. Even when solidified, the rotating body rotates with respect to the fixed body, so that the rotating body side protrusions crush and remove the foreign matter attached to the fixed body, and the fixed body side protrusions adhere to the rotating body. Crush and remove foreign material. Therefore, it is possible to suppress deformation of the O-ring of the floating seal due to solidification of the foreign matter attached to the rotating body and the fixed body. As a result, good sealing performance of the floating seal can be maintained over a long period of time, and the reliability of the rotating device can be improved.

  According to the second aspect of the present invention, by providing the hard portion on the surface of the fixed body side protrusion and the rotating body side protrusion, wear of the fixed body side protrusion and the rotation body side protrusion can be suppressed, and the life thereof can be extended. . For this reason, the solidified foreign matter can be reliably crushed by the fixed body side protrusion and the rotating body side protrusion, and the good sealing performance of the floating seal can be maintained.

  According to the third aspect of the present invention, the fixed body side protrusion and the rotating body side protrusion are arranged to face each other across the axis center of the rotating body, thereby floating by the fixed body side protrusion and the rotating body side protrusion. The seal can be surrounded from the outer peripheral side. For this reason, the amount of foreign matter such as earth and sand entering the floating seal side through the gap between the fixed body and the rotating body can be reduced.

  According to the invention of claim 4, it is possible to reliably crush the foreign matter adhered to and solidified on the fixed body and the rotating body by the crescent-shaped fixed body side protrusions and the acute angle portions provided at both ends of the rotating body side protrusions. it can. Also, by increasing the width dimension of the central part in the length direction of the fixed body side protrusion and the rotating body side protrusion, when the rotating rotating body side protrusion and the fixed body side protrusion pass each other, the distance between the two always changes. Can be made. As a result, the solidified foreign matter does not remain between the fixed body side protruding portion and the rotating body side protruding portion, and the solidified foreign matter can be reliably removed.

  According to the invention of claim 5, when the rotating body rotates, the interval between the upper surface of the fixed body-side protrusion formed in the mountain shape and the opposing surface of the rotating body gradually changes, and the mountain shape is formed. The distance between the upper surface of the rotating body-side protrusion and the opposing surface of the fixed body gradually changes. As a result, the foreign matter adhered and solidified on the fixed body and the rotating body can be crushed so as to be gradually crushed by the upper surface of the fixed body-side protrusion and the upper surface of the rotating body-side protrusion. As a result, it is possible to increase the contact area of the fixed body side protrusions and the rotating body side protrusions that come into contact with foreign matter and reduce the amount of wear of the fixed body side protrusions and the rotating body side protrusions. The life of the body-side protrusion can be extended.

  According to the sixth aspect of the present invention, the fixed body side protrusion and the rotating body side protrusion are constituted by the plurality of rod-shaped protrusions arranged in an annular shape around the axis center of the rotating body. By continuously abutting against the solidified foreign matter, the solidified foreign matter can be reliably crushed. In addition, since each rod-like protrusion is worn almost uniformly, it is possible to suppress a part of the fixed body-side protrusion and the rotating body-side protrusion from being intensively worn, and to extend its life.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a construction machine rotating device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the rotating device is applied to a hydraulic excavator.

  First, FIG. 1 to FIG. 8 show a first embodiment of the present invention. In this embodiment, a case where the present invention is applied to a crawler belt guide roller of a hydraulic excavator is illustrated.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a representative example of a construction machine, and a vehicle body of the hydraulic excavator 1 is mounted on a self-propelled track-type lower traveling body 2 and on the lower traveling body 2 so as to be turnable. The upper revolving body 3 is generally constituted. A working device 4 is attached to the front side of the upper swing body 3 so as to be able to move up and down, and the working device 4 is used for excavation work and the like.

  Reference numeral 5 denotes a track frame constituting the lower traveling body 2, and the track frame 5 has left and right side frames 6 extending in the front and rear directions (only the left side is shown). A traveling device 7 is provided on one end side of the side frame 6, and an idler wheel 8 is provided on the other end side of the side frame 6.

  Here, as shown in FIG. 2, the side frame 6 is formed as a hollow frame having a lower end opened and extending in the front and rear directions. Thick left and right lower plates 6A and 6A extending in the front and rear directions are provided at the lower end of the side frame 6, and each lower crawler belt guide roller 11 described later is provided between the lower plates 6A. It has a configuration to be provided.

  9 is a crawler belt wound between the traveling device 7 and the idler wheel 8, and the crawler belt 9 is driven by the traveling device 7, whereby each upper crawler belt guide roller 10 and each lower crawler belt guide roller 11 described later. The lower traveling body 2 is caused to travel by circling between the traveling device 7 and the idler wheel 8 while being guided by the vehicle.

  Reference numerals 10 and 10 denote two upper crawler belt guide rollers that are rotatably provided on the side frame 6. Each upper crawler belt guide roller 10 supports the crawler belt 9 from the lower side to support the crawler belt 9 with the traveling device 7. The guide is directed toward the idler wheel 8.

  11, 11,... Are a plurality of lower crawler belt guide rollers as rotating devices provided at the lower end of the side frame 6, and each lower crawler belt guide roller 11 points the crawler belt 9 toward the traveling device 7 and the idler wheel 8. To guide you. As shown in FIGS. 2 and 3, each lower crawler belt guide roller 11 includes shaft support members 12, rollers 15, floating seals 18, fixed body side protrusions 23, first and second rotating body side protrusions, which will be described later. It is comprised by the parts 24 and 25 grade | etc.,.

  Reference numerals 12 and 12 denote left and right shaft support members as fixed bodies provided fixed to the left and right lower plates 6A of the side frames 6. These left and right shaft support members 12 are, for example, collars and the like. It is called and supports a roller support shaft 13 described later. Here, each shaft support member 12 has a shaft insertion hole 12A penetrating in the left and right directions, and is fixed to the lower plate 6A of the side frame 6 using bolts or the like.

  Further, a cylindrical flange 12B that accommodates a floating seal 18 described later is provided on the outer peripheral side of each shaft support member 12, and an annular axial end surface 12C of the flange 12B is a shaft of a roller 15 described later. It faces the direction end face 15E in the axial direction. The axial support surface 12 </ b> C of each shaft support member 12 is configured to be provided with a fixed body-side protrusion 23 described later.

  Reference numeral 13 denotes a roller support shaft supported by the left and right shaft support members 12, and the roller support shaft 13 rotatably supports a roller 15 described later. Here, both end portions of the roller support shaft 13 in the axial direction (left and right directions) are inserted into the shaft insertion holes 12A of the left and right shaft support members 12, and are pulled out in the axial direction by the retaining pins 14. In addition to being stopped, the shaft support member 12 is stopped.

  Reference numeral 15 denotes a roller as a rotating body that is rotatably provided with respect to the left and right shaft support members 12 by a roller support shaft 13. The roller 15 is a stepped cylinder having a shaft insertion hole 15A formed at the center. A large-diameter flange portion 15B, 15B is integrally formed on both ends in the axial direction. Here, the left and right ends of the roller 15 have a larger inner diameter than the shaft insertion hole 15A, and a seal mounting hole 15C in which a floating seal 18 described later is mounted, and is larger than the seal mounting hole 15C. A bearing housing hole 15D having an inner diameter dimension and housing the flange 12B of the shaft support member 12 is formed concentrically with the shaft insertion hole 15A.

  An annular axial end surface 15E that is axially opposed to the axial end surface 12C of the shaft support member 12 (the flange portion 12B) is formed between the seal mounting hole 15C and the bearing receiving hole 15D. The end surface 15E is configured to be provided with first and second rotating body side protrusions 24 and 25 described later. Furthermore, an oil sump chamber 15F for storing lubricating oil is formed in the axial center portion of the shaft insertion hole 15A.

  Then, cylindrical slide bearings 16 and 16 are inserted into the shaft insertion hole 15A of the roller 15 from both ends in the axial direction, so that the roller 15 can rotate to the roller support shaft 13 via each slide bearing 16. The crawler belt 9 is guided toward the traveling device 7 and the idler wheel 8 while being restrained from being displaced in the left and right directions by the left and right flange portions 15B. At this time, the sliding surface between the roller support shaft 13 and the slide bearing 16 is constantly lubricated by the lubricating oil supplied from the oil reservoir chamber 15F of the roller 15, and this lubricating oil is contained in the roller 15 by the floating seal 18 described later. It is the structure sealed by.

  Reference numerals 17 and 17 denote left and right circumferential clearances formed between the shaft support member 12 and the roller 15 that rotate relative to each other. The clearances 17 are formed on the shaft support member 12 as shown in FIG. Between the portion 12 </ b> B and the bearing receiving hole 15 </ b> D of the roller 15, it is formed in an annular shape over the entire circumference and opens to the outside of the roller 15.

  Reference numerals 18 and 18 denote left and right floating seals provided between the left and right shaft support members 12 and the rollers 15. The floating seals 18 are formed between the rotating rollers 15 and the shaft support members 12. The sealed gap 17 is sealed. The floating seal 18 seals the lubricating oil stored in the oil sump chamber 15 </ b> F in the roller 15, and suppresses foreign matters such as muddy water and earth and sand from entering the roller 15. Here, as shown in FIG. 3 and FIG. 4 and the like, the floating seal 18 includes a fixed-side seal ring 19, a rotation-side seal ring 20, a fixed-side O-ring 21, a rotation-side O-ring 22 and the like which will be described later. .

  Reference numeral 19 denotes a fixed-side seal ring disposed on the shaft support member 12 side. The fixed-side seal ring 19 is paired with a rotation-side seal ring 20 which will be described later, and is in a state facing the rotation-side seal ring 20. The shaft support member 12 is disposed on the inner peripheral side of the flange portion 12B. Here, the fixed-side seal ring 19 is formed in a cylindrical shape using, for example, a metal material having excellent wear resistance and corrosion resistance, and has an annular seal surface 19 </ b> A that faces the rotation-side seal ring 20. Further, a fixed-side O-ring 21 described later is provided between the outer peripheral surface of the fixed-side seal ring 19 and the inner peripheral surface 12D of the flange portion 12B.

  Reference numeral 20 denotes a rotation-side seal ring disposed on the roller 15 side. The rotation-side seal ring 20 is composed of the same parts as the fixed-side seal ring 19, and is disposed on the inner peripheral side of the seal mounting hole 15C provided in the roller 15. Has been. Here, the rotation-side seal ring 20 has an annular seal surface 20A that is always in sliding contact with the seal surface 19A of the fixed-side seal ring 19. Further, a rotation-side O-ring 22 described later is provided between the outer peripheral surface of the rotation-side seal ring 20 and the inner peripheral surface of the seal mounting hole 15C.

  Reference numeral 21 denotes a fixed-side O-ring sandwiched between an inner peripheral surface 12D of the flange 12B provided on the shaft support member 12 and an outer peripheral surface of the fixed-side seal ring 19, and the fixed-side O-ring 21 is, for example, butadiene It is formed in an annular shape using a rubber material having oil resistance and elasticity such as rubber. The fixed-side O-ring 21 seals between the flange 12B of the shaft support member 12 and the fixed-side seal ring 19, and constantly presses the fixed-side seal ring 19 toward the rotation-side seal ring 20 in the axial direction. To do.

  Reference numeral 22 denotes a rotation-side O-ring sandwiched between an inner peripheral surface of a seal mounting hole 15C provided in the roller 15 and an outer peripheral surface of the rotation-side seal ring 20, and the rotation-side O-ring 22 is a fixed-side O-ring. 21 and the same parts. The rotation-side O-ring 22 seals between the seal mounting hole 15C of the roller 15 and the rotation-side seal ring 20, and constantly presses the rotation-side seal ring 20 toward the fixed-side seal ring 19 in the axial direction. Is.

  Thereby, the seal surface 19A of the fixed side seal ring 19 and the seal surface 20A of the rotation side seal ring 20 are properly slid by the axial pressing force applied from the fixed side O ring 21 and the rotation side O ring 22. The gap 15 between the shaft support member 12 and the roller 15 is liquid-tightly sealed while permitting rotation of the roller 15 with respect to the shaft support member 12, thereby sealing the lubricating oil in the roller 15; and In this configuration, foreign matter such as earth and sand or muddy water is prevented from entering the roller 15 through the gap 17 between the shaft support member 12 and the roller 15.

  Reference numeral 23 denotes a fixed body side protrusion provided on the shaft support member 12. The fixed body side protrusion 23 adheres to the axial end surface 15E of the roller 15 when the roller 15 rotates relative to the shaft support member 12. It crushes foreign matters such as earth and sand solidified. Here, as shown in FIGS. 3 to 5, the fixed body-side protrusion 23 is provided on the axial end surface 12 </ b> C located in the vicinity of the fixed-side O-ring 21 in the shaft support member 12, and extends from the axial end surface 12 </ b> C. Projecting in the axial direction toward the roller 15. As shown in FIG. 5, the fixed body-side protrusion 23 is formed of a protrusion that extends in an arc shape within a range of a certain angle (approximately 180 degrees) around the axial center O of the roller 15. It is integrally formed on the axial end surface 12C of the shaft support member 12 by using.

  In this case, the fixed body-side protrusion 23 protrudes from the axial end surface 12C of the shaft support member 12 with a triangular cross-sectional shape and extends toward the axial end surface 15E of the roller 15 (see FIG. 3). Further, as shown in FIG. 5, both end portions in the length direction of the fixed body side protruding portion 23 become hook-shaped acute angle portions 23 </ b> A, and the fixed body side protruding portion 23 in the radial direction centering on the axial center O of the roller 15. The width dimension is formed so as to gradually increase from each acute angle portion 23A toward the central portion 23B in the length direction. Therefore, the fixed body side protrusion 23 has the largest width in the radial direction at the center in the length direction, and is formed in a crescent shape as a whole.

  Furthermore, the surface of the fixed body side projection 23 is subjected to surface modification treatment such as surface hardening treatment by rapid heating and cooling of the metal surface using a laser, and hard coating formation on the metal surface by thermal spraying of tungsten carbide cermet or the like. By applying, a hard portion 23C having a high surface hardness is provided over the entire length direction.

  Reference numerals 24 and 25 denote first and second rotor-side protrusions provided on the roller 15, respectively. These first and second rotor-side protrusions 24 and 25 rotate the roller 15 relative to the shaft support member 12. In this case, foreign matter such as earth and sand adhered to the axial end surface 12C of the shaft support member 12 and solidified is crushed. Here, the first and second rotor-side protrusions 24 and 25 are provided on the axial end surface 15E located in the vicinity of the rotation-side O-ring 22 of the roller 15. It protrudes in the axial direction from the axial end face 15E toward the shaft support member 12 at a position different in the radial direction centered on the shaft center O.

  As shown in FIG. 5, the first and second rotor-side protrusions 24 and 25 face the fixed body-side protrusion 23 across the axis center O of the roller 15, and the shaft center O of the roller 15. It consists of a projecting body extending in an arc shape within a range of a constant angle (approximately 180 degrees) as a center, and is integrally formed on the axial end surface 15E of the roller 15 using means such as forging.

  In this case, as shown in FIGS. 5 to 8, the first rotating body side protrusion 24 is disposed on the inner peripheral side of the fixed body side protrusion 23 provided on the shaft support member 12, and the second rotating body side The protrusions 25 are arranged on the outer peripheral side of the fixed body side protrusions 23. When the roller 15 rotates, the fixed body side protrusions 23, the first and second rotating body side protrusions 24, 25 are It is configured not to interfere with each other.

  Here, the first and second rotor-side protrusions 24 and 25 protrude from the axial end surface 15E of the roller 15 with a triangular cross-sectional shape and extend toward the axial end surface 12C of the shaft support member 12 (FIG. 3). Further, as shown in FIG. 5, both end portions in the length direction of the first rotating body side projecting portion 24 become bowl-shaped acute angle portions 24A, and the first radial direction centering on the axial center O of the roller 15 is the first. The width dimension of the rotor-side protrusion 24 is formed so as to gradually increase from each acute angle portion 24A toward the central portion 24B in the length direction. Further, both end portions in the length direction of the second rotating body side protruding portion 25 become hook-shaped acute angle portions 25A, and the width of the second rotating body side protruding portion 25 in the radial direction with the axis center O of the roller 15 as the center. The dimensions are formed so as to gradually increase from each acute angle portion 25A toward the central portion 25B in the length direction.

  Accordingly, each of the first and second rotating body side protrusions 24 and 25 has the largest width dimension in the radial direction of the central portion in the length direction, and is formed in a crescent shape as a whole. As a result, as shown in FIGS. 6 to 8, when the rotating first and second rotating body side protrusions 24 and 25 pass the fixed body side protruding section 23, the first and second rotating body side protrusions 24 and 25 and the fixed body side projection part 23 become the structure which always changes.

  Further, the surface of the first and second rotor-side protrusions 24 and 25 is subjected to surface modification treatment such as laser quenching or metal spraying so that the surface hardness is high over the entire length direction. Parts 24C and 25C are provided, respectively.

  The lower crawler belt guide roller 11 according to the present embodiment has the above-described configuration. When the crawler belt 9 is driven while the hydraulic excavator 1 is traveling, the rollers 15 of the lower crawler belt guide rollers 11 are connected to the shaft support member 12. , The crawler belt 9 is guided to the traveling device 7 and the idler wheel 8.

  At this time, the rotation-side seal ring 20 of the floating seal 18 rotates integrally with the roller 15, and the seal surface 20 </ b> A of the rotation-side seal ring 20 rotates by slidingly contacting the seal surface 19 </ b> A of the fixed-side seal ring 19. The space between the roller 15 and the shaft support member 12 can be sealed in a liquid-tight manner. As a result, the lubricating oil is held in the roller 15 by the floating seal 18, and the roller 15 is smoothly rotated by appropriately lubricating the sliding surface between the roller support shaft 13 and the slide bearing 16 with this lubricating oil. Can be made.

  In addition, when the excavator 1 travels in a muddy area, foreign matter such as earth and sand and muddy water enters the gap 17 formed between the shaft support member 12 and the roller 15. Intrusion can be prevented by the floating seal 18, and the sliding surface between the roller support shaft 13 and the slide bearing 16 can be protected.

  However, some of the foreign matter that has entered the gap 17 between the shaft support member 12 and the roller 15 adheres to the axial end surface 12C of the shaft support member 12 and the axial end surface 15E of the roller 15 and solidifies. This solidified foreign matter eventually interferes with the fixed O-ring 21 and the rotary O-ring 22 of the floating seal 18 to deform them.

  On the other hand, in the present embodiment, a fixed body-side protrusion 23 that protrudes toward the axial end surface 15E of the roller 15 is provided on the axial end surface 12C of the shaft support member 12, and the axial end surface 15E of the roller 15 is The first and second rotor-side protrusions 24 and 25 that protrude toward the axial end surface 12C of the shaft support member 12 are provided.

  For this reason, as the roller 15 rotates, the first and second rotor-side protrusions 24 and 25 rotate around the axis center O of the roller 15 as shown in FIGS. As a result, the foreign matter adhered to and solidified on the axial end surface 12C of the shaft support member 12 can be crushed by the first and second rotating body-side protrusions 24 and 25 and adhered to the axial end surface 15E of the roller 15. The solidified foreign matter can be crushed by the fixed body-side protrusion 23.

  Further, while the roller 15 is rotating, the foreign matter that has entered the gap 17 between the shaft support member 12 and the roller 15 is caused by the fixed body-side protrusion 23 and the first and second rotor-side protrusions 24 and 25. Since the agitation is always performed, it is possible to prevent the foreign matter from adhering to the axial end surface 12C of the shaft support member 12 and the axial end surface 15E of the roller 15 and solidifying.

  Therefore, it is possible to reliably prevent foreign matters such as earth and sand and muddy water from adhering to the axial end surface 12C of the shaft support member 12, the axial end surface 15E of the roller 15, and the like. As a result, the fixed-side O-ring 21 and the rotary-side O-ring 22 of the floating seal 18 are prevented from being deformed by the solidified foreign matter, and the O-rings 21 and 22 maintain appropriate elasticity. Good sealing performance can be maintained over a long period of time, and the reliability of the lower crawler belt guide roller 11 can be increased.

  Further, since the fixed body side protrusion 23 and the first and second rotating body side protrusions 24 and 25 are provided with hard portions 23C, 24C and 25C, respectively, by surface modification treatment, these fixed body side protrusions are provided. The solidified foreign matter can be reliably crushed by the portion 23 and the first and second rotating body side protrusions 24 and 25. Further, it is possible to suppress the wear of the fixed body side protrusion 23 and the first and second rotating body side protrusions 24 and 25 and to extend the life thereof.

  Further, when the roller 15 rotates, as shown in FIGS. 6 to 8, the floating seal 18 is always surrounded from the outer peripheral side by the fixed body side protrusion 23 and the first and second rotation body side protrusions 24 and 25. be able to. As a result, the fixed body side protrusion 23 and the first and second rotating body side protrusions 24 and 25 also function as a labyrinth seal and enter the floating seal 18 side through the gap 17 between the shaft support member 12 and the roller 15. The amount of foreign matter to be reduced can be reduced.

  Further, both end portions in the length direction of the fixed body side projection portion 23 are formed as bowl-shaped acute angle portions 23A, and both end portions in the length direction of the first and second rotary body side projection portions 24 and 25 are respectively formed into bowl-shaped acute angles. The parts 24A and 25A are used. As a result, the foreign matter adhered and solidified on the axial end surface 15E of the roller 15 can be reliably crushed by the acute angle portion 23A of the fixed body-side projection 23, and adhered to the axial end surface 12C of the shaft support member 12. The solidified foreign matter can be reliably crushed by the acute angle portions 24A, 25A of the first and second rotating body side projections 24, 25.

  Moreover, the width dimension in the radial direction of the stationary member side projection 23 is formed so as to gradually increase from each acute angle portion 23A toward the central portion 23B in the length direction, and the radial direction of the first rotor side projection 24 is formed. Are formed so as to gradually increase from each acute angle portion 24A toward the central portion 24B in the length direction, and the width dimension in the radial direction of the second rotating body side projection 25 is determined from each acute angle portion 25A. It is formed so as to gradually increase toward the central portion 25B in the length direction. As a result, as shown in FIGS. 6 to 8, when the first and second rotating body side protrusions 24 and 25 and the stationary body side protrusion 23 pass each other, the distance between them can always be changed. As a result, the solidified foreign matter does not remain between the fixed body side protruding portion 23 and the first and second rotating body side protruding portions 24 and 25, and the solidified foreign matter is reliably crushed and removed. be able to.

  Next, FIGS. 9 to 11 show a second embodiment of the present invention. The feature of this embodiment is that the upper surface of the fixed body side protrusion and the upper surface of the rotating body side protrusion are formed in a mountain shape, respectively. It is to have done. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 31 denotes a lower crawler belt guide roller according to the present embodiment. The lower crawler belt guide roller 31 is substantially the same as that according to the first embodiment described above, and the shaft support member 12, the roller 15, the floating seal. 18, which is composed of a fixed body side protrusion 32, which will be described later, and first and second rotating body side protrusions 33, 34, etc., but of the fixed body side protrusion 32, the first and second rotating body side protrusions 33, 34. The configuration is different from that according to the first embodiment.

  Reference numerals 32 and 32 denote fixed body side protrusions provided on the shaft support member 12, and each of the fixed body side protrusions 32 has an axial end face 15 </ b> E of the roller 15 when the roller 15 rotates relative to the shaft support member 12. It crushes foreign substances such as earth and sand that adhere and solidify. Here, the fixed body-side protrusion 32 is provided on the axial end surface 12C of the shaft support member 12 with a spacing of 180 degrees in the circumferential direction, and protrudes in the axial direction from the axial end surface 12C toward the roller 15. Each of the fixed body-side protrusions 32 is formed of a protrusion that extends in an arc shape within a range of a certain angle (approximately 90 degrees) about the axis center O of the roller 15. For example, the shaft support member 12 is formed using means such as forging. Is integrally formed with the axial end surface 12C.

  In this case, as shown in FIGS. 9 and 10, each fixed body-side protrusion 32 protrudes from the axial end surface 12 </ b> C of the shaft support member 12 with a square cross-sectional shape and extends toward the axial end surface 15 </ b> E of the roller 15. Yes. Here, the fixed body side protrusion 32 gradually increases in height in the axial direction from both end portions 32A in the length direction toward the center portion 32B, and the axial end surface 15E of the roller 15 in the fixed body side protrusion 32 is formed. The upper surface 32 </ b> C that faces is formed in a mountain shape that maximizes the height dimension in the axial direction at the center in the length direction.

  Further, the surface of the fixed body side protrusion 32 is subjected to surface modification treatment such as surface hardening treatment by rapid heating and cooling of the metal surface using a laser, and formation of a hard coating on the metal surface by thermal spraying of tungsten carbide cermet or the like. By applying, a hard portion 32D having a high surface hardness is provided over the entire length direction.

  Reference numerals 33 and 33 denote first rotor-side protrusions provided on the roller 15, and 34 and 34 denote second rotor-side protrusions which are also provided on the roller 15, and each of these first and second rotations. The body-side protrusions 33 and 34 crush foreign matter such as earth and sand that adheres to the axial end surface 12C of the shaft support member 12 and solidifies when the roller 15 rotates with respect to the shaft support member 12. The first and second rotor-side protrusions 33 and 34 are provided on the axial end surface 15E located in the vicinity of the rotation-side O-ring 22 of the roller 15. Projecting in the axial direction from the axial end face 15E toward the shaft support member 12 at different positions in the radial direction centered on the axial center O.

  Here, the first rotor-side protrusions 33 and 33 are provided on the axial end surface 15E of the roller 15 with an interval of 180 degrees in the circumferential direction, and in the axial direction from the axial end surface 15E toward the shaft support member 12. It protrudes. Each of the first rotating body side protrusions 33 is formed of a protrusion that extends in an arc shape within a range of a certain angle (approximately 90 degrees) around the axial center O of the roller 15. Fifteen axial end faces 15E are integrally formed.

  On the other hand, the second rotor-side protrusions 34, 34 are also provided on the axial end surface 15E of the roller 15 with an interval of 180 degrees in the circumferential direction, and project in the axial direction from the axial end surface 15E toward the shaft support member 12. ing. Each of the second rotor-side protrusions 34 is also formed of a protrusion that extends in an arc shape within a range of a certain angle (approximately 90 degrees) about the axis center O of the roller 15. Fifteen axial end faces 15E are integrally formed.

  In this case, each first rotating body side protrusion 33 is disposed on the inner peripheral side of each fixed body side protrusion 32 provided on the shaft support member 12, and each second rotating body side protrusion 34 is fixed to each fixed body. It is arranged on the outer peripheral side with respect to the body side projection 32, and is configured such that when the roller 15 rotates, the fixed body side projection 32 and the first and second rotary body side projections 33 and 34 do not interfere with each other. Has been.

  Here, each first rotation-side protrusion 33 protrudes from the axial end surface 15E of the roller 15 with a square cross-sectional shape and extends toward the axial end surface 12C of the shaft support member 12. In addition, each first rotating body-side protrusion 33 gradually increases in height in the axial direction from both end portions 33A in the length direction toward the center portion 33B. The upper surface 33C facing the axial end surface 12C of the support member 12 is formed in a mountain shape that maximizes the axial height dimension at the center in the length direction. Furthermore, the surface of the first rotor-side projection 33 is modified such as surface hardening treatment by rapid heating and cooling of the metal surface using a laser, and formation of a hard film on the metal surface by thermal spraying of tungsten carbide cermet or the like. By performing the quality treatment, the hard portion 33D having a high surface hardness is provided over the entire length direction.

  On the other hand, each of the second rotor-side protrusions 34 also protrudes from the axial end surface 15E of the roller 15 with a square cross-sectional shape and extends toward the axial end surface 12C of the shaft support member 12. In addition, each second rotating body-side protrusion 34 also has an axial height dimension that gradually increases from both end portions 34A in the length direction toward the center portion 34B. The upper surface 34C facing the axial end surface 12C of the support member 12 is formed in a mountain shape that maximizes the height dimension in the axial direction at the center in the length direction. Further, a hard portion 34D is also provided on the surface of the second rotating body side protrusion 34 over the entire length direction.

  The lower crawler belt guide roller 31 according to the present embodiment has the above-described configuration. Also in the present embodiment, the first and second rotating body side protrusions 33 and 34 are provided with the roller 15 as the roller 15 rotates. By rotating about the shaft center O of the shaft, the foreign matter adhered and solidified on the axial end surface 12C of the shaft support member 12 can be crushed by the first and second rotating body side projections 33 and 34, The foreign matter adhered to and solidified on the axial end surface 15E of the roller 15 can be crushed by the fixed body-side protrusion 32.

  However, according to the present embodiment, the upper surface 32C of the fixed body-side protrusion 32 is formed in a mountain shape having the maximum axial height at the center in the length direction, and the first and second rotations. Since the upper surfaces 33C, 34C of the body-side protrusions 33, 34 are formed in a mountain shape that maximizes the height in the axial direction at the center in the length direction, the upper surface 32C of the fixed-body-side protrusion 32 and the shaft of the roller 15 The distance from the direction end surface 15E increases or decreases according to the rotation of the roller 15, and the distance between the upper surfaces 33C and 34C of the first and second rotating body side projections 33 and 34 and the axial end surface 12C of the shaft support member 12 However, it increases or decreases according to the rotation of the roller 15.

  As a result, the foreign matter adhered to and solidified on the axial end surface 15E of the roller 15 is crushed so as to be gradually crushed by the upper surface 32C of the fixed body side projection 32, and adhered to the axial end surface 12C of the shaft support member 12. The solidified foreign matter can be crushed so as to be gradually crushed by the upper surfaces 33C, 34C of the first and second rotating body side projections 33, 34. Therefore, the contact area between the fixed body side protrusion 32 and the foreign object can be increased, and the contact area between the first and second rotating body side protrusions 33 and 34 and the foreign object can be increased. As a result, the amount of wear of the fixed body side protrusion 32 and the first and second rotating body side protrusions 33 and 34 can be reduced, so that the fixed body side protrusion 32 and the first and second rotating body side protrusions. The lifetime of 33 and 34 can be extended.

  Next, FIGS. 12 to 14 show a third embodiment of the present invention. The feature of this embodiment is that the fixed body side protrusion and the rotating body side protrusion are annularly formed around the axis center of the rotating body. Is constituted by a plurality of rod-shaped protrusions arranged in the. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 41 denotes a lower crawler belt guide roller according to the present embodiment. The lower crawler belt guide roller 41 is substantially the same as that according to the first embodiment described above, and the shaft support member 12, the roller 15, the floating seal. 18. Although constituted by a fixed body side protrusion 42, first and second rotating body side protrusions 43 and 44, which will be described later, the fixed body side protrusion 42 and the first and second rotating body side protrusions 43 and 44 The configuration is different from that according to the first embodiment.

  Reference numeral 42 denotes a fixed-body-side protrusion provided on the shaft support member 12, and the fixed-body-side protrusion 42 crushes foreign matters such as earth and sand adhered to the axial end surface 15 </ b> E of the roller 15 and solidified. Here, the fixed body-side protrusion 42 is composed of a plurality of short cylindrical rod-like protrusions 42A, 42A,... Arranged in an annular shape around the axial center O of the roller 15, and uses, for example, means such as forging. The shaft support member 12 is integrally formed with the axial end surface 12C. Further, the surface of each rod-like protrusion 42A is subjected to surface modification treatment such as surface hardening treatment by rapid heating and cooling of the metal surface using a laser, and formation of a hard coating on the metal surface by thermal spraying of tungsten carbide cermet or the like. By applying, the hard part 42B is provided.

  Reference numerals 43 and 44 denote first and second rotor-side protrusions provided on the roller 15, respectively. These first and second rotor-side protrusions 43 and 44 are formed on the axial end surface 12 </ b> C of the shaft support member 12. It crushes foreign matter such as earth and sand that adheres and solidifies. Here, the first rotor-side protrusion 43 is composed of a plurality of short cylindrical rod-like protrusions 43A, 43A,... Arranged in an annular shape around the axial center O of the roller 15. The rotator-side protrusion 44 is composed of a plurality of short cylindrical rod-like protrusions 44A, 44A,... Arranged in an annular shape around the axial center O of the roller 15. Further, a hard portion 43B is provided on the surface of each rod-like projection 43A of the first rotor-side projection 43 by performing a surface modification process, and each rod-like projection of the second rotor-side projection 44 is provided. The hard portion 44B is also provided on the surface of 44A by performing a surface modification treatment.

  The lower crawler belt guide roller 41 according to the present embodiment has the above-described configuration. Also in the present embodiment, the first and second rotating body side protrusions 43 and 44 are provided with the roller 15 as the roller 15 rotates. By rotating about the shaft center O of the shaft, the foreign matter adhered and solidified on the axial end surface 12C of the shaft support member 12 can be crushed by the first and second rotating body side projections 43 and 44, The foreign matter adhering to the axial end surface 15E of the roller 15 and solidified can be crushed by the fixed body-side protrusion 42.

  However, according to the present embodiment, the fixed body side protrusion 42 is constituted by the plurality of rod-like protrusions 42A arranged in an annular shape, and the first and second rotating body side protrusions 43 and 44 are respectively formed in an annular shape. A plurality of rod-shaped protrusions 43A and 44A are arranged. For this reason, the solidified foreign matter can be reliably crushed by continuously contacting the solidified foreign matter with the plurality of rod-shaped protrusions 42A, 43A, 44A. In addition, the rod-like projections 42A, 43A, 44A wear almost evenly, so that the fixed-body-side projection 42 and parts of the first and second rotating-body-side projections 43, 44 are worn intensively. The life of the fixed body side protrusion 42 and the first and second rotating body side protrusions 43 and 44 can be extended.

  In the first embodiment described above, the case where one fixed body side protrusion 23 is provided on the shaft support member 12 and two rotating body side protrusions 24 and 25 are provided on the roller 15 is illustrated. . However, the present invention is not limited to this, and the roller 15 may be provided with one rotor-side protrusion, and the shaft support member 12 may be provided with two or more fixed-body-side protrusions. A plurality of fixed body side protrusions may be provided, and the roller 15 may be provided with a plurality of rotating body side protrusions. The same applies to the second and third embodiments.

  Further, in each of the above-described embodiments, the lower crawler belt guide roller 11 (31, 41) of the hydraulic excavator 1 is described as an example as the rotation device of the construction machine. However, the present invention is not limited to this, and can be widely applied to other rotating devices having floating seals such as the traveling device 7 and idler wheels 8 of the excavator 1 shown in FIG.

It is a front view which shows the hydraulic shovel provided with the lower crawler belt guide roller by the 1st Embodiment of this invention. FIG. 2 is a cross-sectional view of a shaft support member, a roller, a floating seal, a fixed body side protrusion, a rotating body side protrusion, and the like of a lower crawler belt guide roller as viewed from the direction of arrows II-II in FIG. FIG. 3 is an enlarged cross-sectional view of a main part showing an enlarged view of a fixed body side protrusion, a rotating body side protrusion, a floating seal, and the like in FIG. 2. It is a partially broken exploded perspective view showing a shaft support member provided with a fixed body side protrusion and a roller provided with a rotating body side protrusion. It is sectional drawing which looked at the axis | shaft support member, the roller, the stationary body side protrusion part, the rotary body side protrusion part, etc. from the arrow VV direction in FIG. It is operation | movement explanatory drawing which shows the positional relationship of the fixed body side protrusion part in FIG. 5, and a rotary body side protrusion part. FIG. 7 is an operation explanatory view similar to FIG. 6 illustrating a state in which the rotating body side protrusion is rotated. FIG. 7 is an operation explanatory view similar to FIG. 6 illustrating a state in which the rotating body-side protrusion is further rotated. It is a principal part expanded sectional view which expands and shows the stationary body side projection part, rotary body side projection part, floating seal, etc. by 2nd Embodiment. It is a partially broken exploded perspective view showing a shaft support member provided with a fixed body side protrusion and a roller provided with a rotating body side protrusion. FIG. 10 is a cross-sectional view of a shaft support member, a roller, a fixed body side protrusion, a rotating body side protrusion, and the like viewed from the direction of arrows XI-XI in FIG. 9. It is a principal part expanded sectional view which expands and shows the stationary body side protrusion part, rotary body side protrusion part, floating seal, etc. by 3rd Embodiment. It is a partially broken exploded perspective view showing a shaft support member provided with a fixed body side protrusion and a roller provided with a rotating body side protrusion. It is sectional drawing which looked at the axis | shaft support member, the roller, the stationary body side protrusion part, the rotary body side protrusion part, etc. from the arrow XIV-XIV direction in FIG.

Explanation of symbols

1 Hydraulic excavator 2 Lower traveling body (vehicle body)
3 Upper swing body (car body)
11, 31, 41 Lower crawler belt guide roller (rotating device)
12 Shaft support member (fixed body)
15 Roller (Rotating body)
17 Clearance 18 Floating seal 19 Fixed side seal ring 19A, 20A Seal surface 20 Rotation side seal ring 21 Fixed side O-ring 22 Rotation side O-ring 23, 32, 42 Fixed body side projections 23A, 24A, 25A Sharp corners 23B, 24B, 25B Central part 23C, 24C, 25C, 32D, 33D, 34D, 42B, 43B, 44B Hard part 24, 33, 43 1st rotation side protrusion part 25, 34, 44 2nd rotation side protrusion part 32C, 33C, 34C Upper surface 42A, 43A, 44A Bar-shaped protrusion

Claims (6)

A fixed body provided fixed to a vehicle body of a construction machine, a rotating body provided to be rotatable with respect to the fixed body in a state in which a circumferential clearance opening to the outside is formed between the fixed body, A floating seal that seals a gap between the fixed body and the rotating body, and the floating seal is disposed on the inner peripheral side of the fixed body and the inner peripheral side of the rotating body and has a sealing surface that is in sliding contact with each other. And a pair of O-rings provided between the inner peripheral surface of the fixed body and the seal ring and between the inner peripheral surface of the rotating body and the seal ring, respectively. In the construction machine rotating device
A surface of the fixed body that is located in the vicinity of the O-ring and faces the rotating body in the axial direction is provided with a fixed body-side protrusion that protrudes toward the rotating body, and the O-ring of the rotating body. A rotating body side protrusion that protrudes toward the fixed body at a position that is different from the fixed body side protrusion in the radial direction is provided on a surface that is positioned in the vicinity of the fixed body and faces the fixed body in the axial direction. Rotating device for construction machinery.   2. The rotating device for a construction machine according to claim 1, wherein the surfaces of the fixed body side protruding portion and the rotating body side protruding portion are provided with a hard portion by performing a surface modification treatment.   The fixed body side protruding portion is arranged in an arc shape within a range of a fixed angle with respect to the axial center of the rotating body, and the rotating body side protruding portion faces the fixed body side protruding portion across the axial center of the rotating body. 3. The construction machine rotating device according to claim 1, wherein the rotating device is arranged in an arc shape within a range of a constant angle.   The construction according to claim 3, wherein the fixed body side protruding portion and the rotating body side protruding portion are formed in a crescent shape in which both end portions in the length direction are acute angle portions and the width dimension of the central portion in the length direction is large. Rotating device of the machine.   The upper surface of the fixed body side protrusion that faces the rotating body is formed in a mountain shape having a large height at the center in the length direction, and the upper surface of the rotating body side protrusion that faces the fixed body is The rotation device for a construction machine according to claim 3, wherein the height of the central portion in the lengthwise direction is formed in a mountain shape.   3. The construction machine according to claim 1, wherein each of the fixed body-side protrusion and the rotating body-side protrusion includes a plurality of rod-like protrusions arranged in an annular shape around the axial center of the rotating body. Rotating device.

Images