WO2014073519A1 - Dispositif de réglage de tension d'une bande de chenille - Google Patents

Dispositif de réglage de tension d'une bande de chenille Download PDF

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Publication number
WO2014073519A1
WO2014073519A1 PCT/JP2013/079856 JP2013079856W WO2014073519A1 WO 2014073519 A1 WO2014073519 A1 WO 2014073519A1 JP 2013079856 W JP2013079856 W JP 2013079856W WO 2014073519 A1 WO2014073519 A1 WO 2014073519A1
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WIPO (PCT)
Prior art keywords
valve
grease
mounting hole
hole
passage
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Application number
PCT/JP2013/079856
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English (en)
Japanese (ja)
Inventor
裕史 大濱
五木田　修
関口　良明
Original Assignee
日立建機株式会社
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Publication date
Application filed by 日立建機株式会社 filed Critical 日立建機株式会社
Priority to JP2014545702A priority Critical patent/JPWO2014073519A1/ja
Publication of WO2014073519A1 publication Critical patent/WO2014073519A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/30—Track-tensioning means

Definitions

  • the present invention relates to a crawler belt tension adjustment device suitably used for a crawler type vehicle provided with crawler belts such as hydraulic excavators and hydraulic cranes.
  • a hydraulic shovel as a representative example of a construction machine is provided with a self-propelled crawler type lower traveling body, an upper revolving body pivotally mounted on the lower traveling body, and an upper revolving body so as to be capable of raising and lowering. And the working device.
  • the lower traveling body of the hydraulic shovel is provided so as to be movable forward and backward via a yoke at one end side of the side frame with a track frame having left and right side frames extending forward and backward.
  • Idle wheel, a drive wheel provided on the other end side of the side frame, a crawler belt wound around the idle wheel and the drive wheel, and a side for adjusting tension of the crawler belt A crawler belt tensioning device provided between the frame and the idler wheel is provided.
  • the crawler belt tension adjusting device includes a tube disposed in the side frame, a yoke side rod in which the rear end is fixedly fitted into the tube by press-fitting means, and a front end protrudes toward the yoke, and a front end is a tube
  • a frame-side rod inserted into the housing with the rear end projecting to the side opposite to the yoke, a spring member provided between the tube and the yoke or between the tube and the side frame, the yoke-side rod and the frame side rod
  • an injection valve installed in the valve mounting hole for injecting grease, and a discharge valve for discharging the grease. It is configured Te.
  • the yoke moves forward and backward together with the idler wheel according to the expansion and contraction of the spring member.
  • the distance between the idler wheel and the drive wheel is appropriately changed according to the deformation of the crawler belt, and the tension of the crawler belt can be adjusted and the idler wheel and the drive wheel can be protected.
  • an injection valve for injecting grease into the grease chamber when the tension of the crawler belt is strengthened and a discharge valve for discharging the grease from the grease chamber when the tension of the crawler belt is weakened. It has two valve members with a valve.
  • the present invention has been made in view of the above-described problems of the prior art, and it is an object of the present invention to provide a crawler belt tensioning device capable of facilitating the adjustment operation when adjusting the tension of the crawler belt attached to a construction machine. .
  • a tube disposed in a side frame constituting a construction machine a yoke side rod having a rear end inserted into the tube and a front end projecting toward the yoke, and a front end inserted into the tube
  • a frame side rod whose rear end protrudes from the tube to the opposite side to the yoke, a grease chamber formed in the tube by the rear end of the yoke side rod and the front end of the frame side rod, and the frame
  • a grease supply valve having a valve portion seated on the valve seat of the grease passage, the grease supply valve comprising: a tub
  • a feature of the present invention is that the annular groove has the male screw of the grease supply valve screwed into the female screw hole of the valve mounting hole and the valve part of the grease supply valve is seated on the valve seat of the grease passage. And the distance from the open end of the valve mounting hole to the axial intermediate position of the seal ring is set smaller than the pitch of the male screw. is there.
  • the distance from the open end of the valve mounting hole to the axial intermediate position of the seal ring is smaller than the pitch of the male screw of the lubrication valve in a state where the lubrication valve is seated on the grease passage valve seat. Is also set small.
  • the seal ring can be released from the open end of the valve mounting hole only by slightly rotating the external thread of the lubrication valve relative to the female screw hole of the valve mounting hole. As a result, the grease can be discharged to the outside quickly, and the workability of the work of adjusting the tension of the crawler belt can be enhanced.
  • the male screw starts loosening from the female screw hole of the valve mounting hole and separates from the cylindrical hole of the valve mounting hole within one rotation, and the grease in the grease chamber is the grease discharge groove
  • the configuration is such that the fluid is discharged to the outside from between the rear side outer peripheral surface of the grease supply valve main body and the open end of the valve mounting hole.
  • the seal ring is separated from the cylindrical hole of the valve mounting hole within one rotation after the lubrication valve starts to be loosened, the grease can be quickly discharged to the outside.
  • the lubrication valve moves by one pitch of the male screw, the gap formed between the valve portion of the lubrication valve and the valve seat can be reduced.
  • the amount of grease discharged from the grease chamber can be reduced, and the speed at which the track is loosened can be reduced, so that the workability when finely adjusting the tension of the track can be enhanced.
  • the axially intermediate position of the seal ring is in contact with the inner peripheral surface of the cylindrical hole in a state where the valve portion of the grease supply valve main body is seated on the valve seat of the grease passage To prevent it from leaking out.
  • the distance (B) from the open end of the valve mounting hole to the axial intermediate position of the seal ring is the radius of the seal ring It is in the dimension corresponding to (R / 2). According to this configuration, the axial intermediate position of the seal ring can be released from the open end of the valve mounting hole only by slightly rotating the external thread of the lubrication valve in the loosening direction.
  • the grease passage includes an axial passage extending in the axial direction of the frame side rod, a radial passage extending in the radial direction of the frame side rod, and the valve seat provided in the radial passage.
  • the valve mounting hole is provided coaxially with the radial passage of the grease passage, and the open end is open to the outer peripheral surface of the frame side rod.
  • FIG. 4 is a cross-sectional view of the crawler belt tensioning adjustment device according to the present embodiment as viewed in the direction of arrows IV-IV in FIG. 3; It is sectional drawing of the principal part expansion which expands and shows the flame
  • FIG. 4 is a cross-sectional view of the crawler belt tensioning adjustment device according to the present embodiment as viewed in the direction of arrows IV-IV in FIG. 3; It is sectional drawing of the principal part expansion which expands and shows the flame
  • FIG. 9 is an enlarged cross-sectional view of the same position as in FIG. 8, showing a state in which the seal ring is detached from the valve mounting hole by causing the oil supply valve to make one or more rotations. It is an external view which shows the greasing valve to which the seal ring was attached.
  • FIG. 11 is a cross-sectional view of the oil supply valve and the seal ring as viewed in the direction of arrows XI-XI in FIG. It is an exploded perspective view showing a frame side rod, a grease supply valve, a seal ring, a valve retaining plate and the like. It is sectional drawing of the position similar to FIG. 5 which shows the modification at the time of integrally forming a frame side rod and a holder.
  • reference numeral 1 denotes a hydraulic shovel
  • the hydraulic shovel 1 includes a crawler-type lower traveling body 2 capable of self-propelled travel, an upper revolving structure 3 rotatably mounted on the lower traveling body 2, and an upper portion It is provided on the front side of the revolving unit 3 so as to be able to move up and down, and is constituted by a work device 4 for excavating earth and sand.
  • the lower traveling body 2 is configured to include a track frame 5, an idle wheel 10, a drive wheel 11, a crawler belt 13, and a crawler belt tension adjustment device 21 described later.
  • Reference numeral 5 denotes a track frame that constitutes the lower traveling body 2.
  • the track frame 5 includes a center frame 6 on which the upper swing body 3 is rotatably mounted, and left and right sides provided on both sides of the center frame 6 so as to extend left and right, left and right And the side frame 7).
  • the side frame 7 is formed as a rectangular cylinder which is surrounded by the upper plate 7A, the lower plate 7B, the inner plate 7C, and the outer plate 7D and extends in the front and rear directions.
  • a work opening 7E is formed on the front side (hereinafter referred to as the front side) in the front and rear direction.
  • the work opening 7E is an opening for connecting a oil supply device (not shown) such as a grease gun to a oil supply valve 31 of the crawler belt tension adjusting device 21 described later.
  • a thick support plate 7F is fixedly provided inside the side frame 7, and a holder mounting hole 7G to which a holder 26 of a frame side rod 24 described later is fitted is formed in the support plate 7F. There is.
  • the idler wheel bracket 8 is provided on the front side of the side frame 7.
  • the idler wheel bracket 8 is provided with a flange plate 8A joined to the end of the side frame 7 by welding or the like, and faces the left and right in order to support the idler wheel 10, which protrudes forward from the flange plate 8A. It comprises an inner support plate 8B, an outer support plate 8C, and an upper connecting plate 8D integrally connecting the upper portions of the support plates 8B and 8C.
  • the flange plate 8A is formed with a through hole 8E which penetrates in the front and back directions and into which the yoke 9 and the like described later are loosely inserted.
  • Guides 8F and 8G for guiding the below-mentioned yoke 9 slidably in the front and rear directions are provided on the inner surface side of the inner support plate 8B and the outer support plate 8C so as to extend in the front and rear directions, respectively.
  • a yoke 9 is provided in the idler wheel bracket 8.
  • the yoke 9 is disposed so as to be movable forward and backward along the guides 8F and 8G of the idler wheel bracket 8, and supports the idler wheel 10 described later so as to be movable forward and backward.
  • the yoke 9 is formed by an annular spring receiver 9A for receiving the front end of a spring member 27 described later, and a left arm 9B and a right arm 9C bifurcated from the spring receiver 9A.
  • the yoke 9 is formed in a V-shape as a whole.
  • the inner peripheral side of the spring receiver 9A is a rod insertion hole 9D through which a yoke side rod 23 described later is slidably inserted.
  • bearing arms 10B and 10C of the idle wheel 10 described later are attached respectively.
  • the idler wheel 10 is rotatably supported by the idler wheel bracket 8.
  • a support shaft 10A extending in the left and right directions is provided at the center of the idler wheel 10. Both ends of the support shaft 10A are rotatably supported by the left bearing arm 10B and the right bearing arm 10C.
  • the left bearing arm 10B and the right bearing arm 10C are attached to the front ends of the left arm 9B and the right arm 9C of the yoke 9 using bolts.
  • the idler wheel 10 can be moved forward and backward along with the yoke 9 along the guides 8F and 8G of the idler wheel bracket 8.
  • the drive wheel 11 is provided on the rear end side in the front and rear direction of the side frame 7, and the drive wheel 11 is attached to the side frame 7 via a drive wheel bracket 12.
  • the driving wheel 11 is formed of a sprocket, and the driving wheel 11 is rotationally driven by a traveling hydraulic motor (not shown) to cause a crawler belt 13 described later to circulate.
  • the crawler belt 13 is wound and attached between the idler wheel 10 and the drive wheel 11.
  • the crawler belt 13 is guided by the upper roller 14 on the upper side of the side frame 7 and is guided by the lower roller 15 on the lower side of the side frame 7.
  • the crawler belt 13 rotates between the drive wheel 11 and the idler wheel 10 by rotationally driving the drive wheel 11, and stably travels the hydraulic shovel 1 even on uneven ground or the like.
  • Reference numeral 21 denotes a crawler belt tension adjusting device provided inside the side frame 7.
  • the crawler belt tension adjusting device 21 adjusts the tension of the crawler belt 13 between the idle wheel 10 and the drive wheel 11.
  • the crawler belt tension adjusting device 21 includes a tube 22, a yoke side rod 23, a frame side rod 24, a spring member 27, a grease chamber 28, a grease passage 29, a valve mounting hole 30, a oil supply valve 31, and a valve removal prevention.
  • a plate 42 is included.
  • the reference numeral 22 denotes a tube extending forward and backward in the side frame 7, and the tube 22 is generally formed in a stepped cylindrical shape.
  • the inner peripheral side of the tube 22 is a rod sliding hole 22A, and the outer peripheral side of the tube 22 is integrally formed with a wedge-shaped spring receiver 22B located on the rear side (the drive wheel 11 side).
  • the front end side of the tube 22 is a rod mounting hole 22 ⁇ / b> C having a diameter smaller than that of the rod sliding hole 22 ⁇ / b> A.
  • the reference numeral 23 denotes a yoke side rod provided on the front side of the tube 22 in the front and rear direction (hereinafter referred to as the front side), the rear end of the yoke side rod 23 is inserted into the tube 22 and the front end is outside the tube 22 It protrudes.
  • the yoke-side rod 23 has a cylindrical rod body 23A whose rear end is fixedly inserted into the rod attachment hole 22C of the tube 22 by press-fitting means.
  • the front end of the rod body 23A is the yoke 22 to the yoke 9 Protruding towards.
  • a rod male screw 23B is provided at the front end of the rod main body 23A, and a nut 23C is screwed into the rod male screw 23B.
  • the front end side of the rod main body 23A is slidably (movably) inserted through a rod insertion hole 9D provided in the yoke 9.
  • the spring receiver 9A of the yoke 9 is axially secured by a nut 23C which is screwed to the rod external thread 23B of the rod body 23A.
  • the nut 23C is loosened by a locking member 23D provided at the front end of the rod body 23A.
  • the reference numeral 24 denotes a frame side rod provided on the rear side of the tube 22.
  • the front end of the frame side rod 24 is inserted into the tube 22, and the rear end protrudes from the tube 22 to the opposite side to the yoke 9.
  • the frame side rod 24 has a rod body 25 whose front end side is slidably inserted into the rod sliding hole 22A of the tube 22 and whose rear end protrudes toward the support plate 7F of the side frame 7 and the rear of the rod body 25 It comprises the holder 26 integrally attached to the end using means such as press fitting.
  • the holder 26 constituting the frame side rod 24 is a rectangular plate-like contact plate 26A, and a bottomed cylindrical rod inserted axially from the front side surface 26B of the contact plate 26A.
  • the rear end side of the rod body 25 is press-fitted into the rod fitting cylinder 26C of the holder 26.
  • the holder 26 of the frame side rod 24 fits the mounting protrusion 26E in the holder mounting hole 7G of the support plate 7F provided in the side frame 7.
  • the holder 26 is positioned with respect to the side frame 7, and the holder 26 is supported by the support plate 7F in a state where the rear side surface 26D of the contact plate 26A is in contact with the support plate 7F.
  • a female screw hole 26F for attaching a valve retaining plate 42 described later is screwed on the front side surface 26B of the contact plate 26A constituting the holder 26 (see FIG. 12).
  • the spring member 27 is provided between the spring bearing 22 B of the tube 22 and the spring bearing 9 A of the yoke 9.
  • the spring member 27 is a coiled compression spring, and is attached in a compressed state between the spring bearing 22B of the tube 22 and the spring bearing 9A of the yoke 9.
  • the spring member 27 presses the idler wheel 10 supported by the yoke 9 in a direction away from the drive wheel 11 by always biasing the spring receiver 9A of the yoke 9 toward the nut 23C of the yoke side rod 23. It is.
  • the crawler belt tension adjustment device 21 always presses the idler wheel 10 in the direction of separating from the drive wheel 11 by the spring force of the spring member 27 and gives the crawler belt 13 an appropriate tension. Therefore, when the crawler belt 13 is deformed according to the ups and downs of the ground or the like while the hydraulic shovel 1 is traveling, the spring member 27 is bent and deformed to appropriately change the distance between the idle wheel 10 and the drive wheel 11. It is possible to suppress the application of an excessive load (tension) to 13.
  • the grease chamber 28 is defined between the rear end of the yoke rod 23 and the front end of the frame rod 24.
  • Grease is supplied to or discharged from the grease chamber 28 through a grease valve 31 and a grease passage 29 described later, and the frame side rod 24 protrudes from the tube 22 according to the amount of grease filled in the grease chamber 28. The amount is adjusted.
  • a grease passage 29 is provided in the frame side rod 24.
  • the grease passage 29 is located in the vicinity of an axial passage 29A axially extending in the central portion of the rod body 25 and a rear end of the rod body 25. It comprises a radially extending radial passage 29B.
  • the radial passage 29 B extends in the radial direction of the rod body 25, the inner diameter side communicates with the axial passage 29 A, and the outer diameter side extends toward the outer peripheral surface of the rod body 25.
  • the axial passage 29A communicates with the grease chamber 28 at its front end.
  • valve mounting hole 30 described later is provided on the outer diameter side (rear end side) of the radial passage 29B, and the boundary portion between the radial passage 29B and the valve mounting hole 30 is recessed in a tapered shape.
  • a valve seat 29C is formed. That is, the grease passage 29 is formed between the grease chamber 28 and the valve seat 29C.
  • Reference numeral 30 denotes a valve mounting hole provided on the rear end side of the grease passage 29 and provided over the rod main body 25 and the holder 26.
  • the valve mounting hole 30 is formed between the valve seat 29C and an open end 30B described later.
  • the valve attachment hole 30 is formed coaxially with the radial direction passage 29B, and a greasing valve 31 described later is attached thereto.
  • the valve mounting hole 30 is formed across the rod main body 25 constituting the frame side rod 24 and the rod insertion cylinder 26C of the holder 26.
  • the valve mounting hole 30 is located on the front side (the valve seat 29C side), and has a female screw hole 30A provided in the rod main body 25, an opening end 30B opened in the outer peripheral surface of the rod main body 25, and the valve mounting hole 30. And a cylindrical hole 30C provided in a rod insertion cylinder 26C of the holder 26 with a hole diameter larger than that of the female screw hole 30A.
  • An external screw 35 of a grease supply valve 31 described later is screwed into the female screw hole 30A of the valve mounting hole 30.
  • the pitch of the female screw hole 30A is the same pitch A as the male screw 35 of the oil supply valve 31.
  • Reference numeral 31 denotes a lubrication valve mounted in the valve mounting hole 30 of the grease passage 29.
  • the grease supply valve 31 is connected to a grease supply device (not shown) such as a grease gun when the grease is supplied into the grease chamber 28 of the tube 22 and the grease chamber 28 is filled with the grease. 28 is to be held.
  • the grease supply valve 31 includes a valve body 32, a grease nipple 33, a check valve mechanism 34, an external thread 35, a grease discharge groove 36, an annular groove 38, a seal ring 39, and a stopper 40 described later. Is composed including.
  • the valve main body 32 forms an outer shell of the oil supply valve 31, and the valve main body 32 is located on the front side in the axial direction and on the front side outer peripheral surface 32A provided with a male screw 35 described later
  • the valve body 32 is formed in a stepped cylindrical shape as a whole, including a rear side outer peripheral surface 32B which is located and provided with an annular groove 38 described later.
  • a grease filling hole 32C which is a passage when the grease is filled, is formed inside the valve main body 32 and at an intermediate position in the axial direction.
  • an inlet 32D having a pore diameter larger than that of the grease filling hole 32C and into which the grease flows, and the inlet 32D is a grease that serves as a connection port such as a grease gun.
  • the nipple 33 is screwed on.
  • valve main body 32 On the other hand, on the front side in the axial direction of the valve main body 32, there is provided an outlet 32E which has a larger pore diameter than the grease filling hole 32C and from which the grease flows out, and a boundary between the grease filling hole 32C and the outlet 32E The valve seat 32F is formed. Further, at the front end of the front outer peripheral surface 32A of the valve main body 32, a valve portion 32G which protrudes in a tapered shape is formed, and the valve portion 32G is seated on or away from the valve seat 29C of the grease passage 29.
  • the check valve mechanism 34 is provided in the outlet 32E of the valve body 32, and the check valve mechanism 34 is a spherical valve body 34A that closes the grease filling hole 32C by being seated on the valve seat 32F; It consists of a spring member 34B that biases the body 34A toward the valve seat 32F.
  • the check valve mechanism 34 allows grease to flow from the grease filling hole 32C of the valve body 32 to the grease passage 29 through the outlet 32E, and prevents the backflow of grease from the grease passage 29 to the outside through the grease filling hole 32C. It is a thing.
  • Reference numeral 35 denotes an external thread provided on the outer peripheral surface on the front side of the valve body 32, that is, on the front outer peripheral surface 32A on the front side in the screwing direction into the valve mounting hole 30.
  • the male screw 35 has a dimension (pitch) A between adjacent threads and a thread, and is screwed into the female screw hole 30A of the valve mounting hole 30. Therefore, the greasing valve 31 is inserted into the valve mounting hole 30 by screwing the male screw 35 into the female screw hole 30A of the valve mounting hole 30. At this time, the valve portion 32G of the valve body 32 is seated on the valve seat 29C of the grease passage 29, whereby the oil supply valve 31 is fixed to the valve mounting hole 30 (see FIG. 6).
  • Reference numeral 36 denotes a grease discharge groove provided on the front outer peripheral surface 32A of the valve body 32.
  • the grease discharge groove 36 is formed as a recessed groove extending over the male screw 35 in the axial direction than the male screw 35 by notching the outer peripheral surface of the valve body 32 at a position overlapping the part where the male screw 35 is formed. . Therefore, as shown in FIGS. 7 to 9, the male screw 35 of the oil supply valve 31 is loosened from the female screw hole 30A of the valve mounting hole 30, and the valve portion 32G of the valve body 32 is separated from the valve seat 29C of the grease passage 29. Thus, the grease in the grease chamber 28 is drawn from the grease passage 29 through the grease discharge groove 36 to the cylindrical hole 30C of the valve mounting hole 30, and is discharged from the cylindrical hole 30C to the outside.
  • the tool engagement portion 37 is provided on the outer peripheral surface on the rear side (grease nipple 33 side) of the valve main body 32, and the tool engagement portion 37 is formed in a thick hexagonal plate shape.
  • the tool engagement portion 37 engages a tool such as a spanner when tightening or loosening the male screw 35 of the oil supply valve 31 with respect to the female screw hole 30A of the valve mounting hole 30.
  • reference numeral 38 denotes an annular groove provided on the rear outer peripheral surface 32B of the valve body 32.
  • the annular groove 38 is formed as an entire peripheral groove in which the rear outer peripheral surface 32B of the valve body 32 is cut in a recessed shape over the entire periphery.
  • a seal ring 39 described later is fitted in the annular groove 38.
  • the annular groove 38 when the oil supply valve 31 is attached to the valve attachment hole 30 and the valve is closed, that is, in a state where the valve portion 32G of the oil supply valve 31 is seated on the valve seat 29C of the grease passage 29 It is provided at a position adjacent to the open end 30 B of the mounting hole 30. That is, the annular groove 38 is provided at a position where the boundary with the rear outer peripheral surface 32B overlaps the opening end 30B.
  • Shown at 39 is a seal ring fitted in and attached to the annular groove 38.
  • the seal ring 39 is formed in an annular shape with a circular cross section using a rubber material excellent in oil resistance, and is fitted to the annular groove 38 with a suitable interference.
  • the seal ring 39 is mounted in a state where the grease supply valve 31 is attached to the valve mounting hole 30 and the valve portion 32 G of the valve main body 32 is seated on the valve seat 29 C of the grease passage 29.
  • the axial intermediate position 39A resiliently abuts near the outer edge of the inner peripheral surface of the cylindrical hole 30C of the valve mounting hole 30.
  • the seal ring 39 seals between the outer peripheral surface of the valve main body 32 of the grease supply valve 31 and the inner peripheral surface of the valve mounting hole 30, and prevents entry of mud water or the like into the valve mounting hole 30. .
  • valve portion 32G of the oil supply valve 31 is directed in a direction away from the valve seat 29C of the grease passage 29 Move by the distance corresponding to A.
  • the valve portion 32G of the valve main body 32 is separated from the valve seat 29C of the grease passage 29, and the seal ring 39 is detached from the cylindrical hole 30C of the valve mounting hole 30 to the outside.
  • the reference numeral 40 denotes a stopper provided on the outer peripheral side of the valve body 32.
  • the stopper 40 is formed in the shape of a hexagonal plate similar to the tool engaging portion 37, and is disposed between the tool engaging portion 37 and the annular groove 38.
  • the stopper 40 and the tool engaging portion 37 face each other at an interval in the axial direction, and between the stopper 40 and the tool engaging portion 37, a space 41 into which a valve retaining plate 42 described later is inserted is formed. .
  • the stopper 40 is in contact with a valve retaining plate 42 described later when the lubrication valve 31 is loosened from the valve mounting hole 30.
  • valve retaining plate 42 indicates a valve retaining plate as a retaining member provided on the frame side rod 24.
  • the valve retaining plate 42 prevents removal of the oil supply valve 31 so that the oil supply valve 31 does not fall off from the valve mounting hole 30 when the oil supply valve 31 is loosened.
  • the valve retaining plate 42 is fixed to the rectangular mounting plate 42A facing the front side surface 26B of the holder 26 constituting the frame side rod 24 and fixed to the mounting plate 42A in the upper and lower directions.
  • a rectangular contact plate 42B inserted into the space 41 between the tool engaging portion 37 of the lubrication valve 31 and the stopper 40.
  • a bolt insertion hole 42C through which a bolt 43 described later is inserted is bored in the mounting plate 42A.
  • a bifurcated notch 42D engaged with the outer peripheral surface of the valve main body 32 between the tool engagement portion 37 and the stopper 40 is formed.
  • the valve retaining plate 42 is attached to the front side surface 26B of the holder 26 by inserting the bolt 43 into the bolt insertion hole 42C of the mounting plate 42A and screwing the bolt 43 into the female screw hole 26F of the holder 26.
  • the contact plate 42B of the valve retaining plate 42 is inserted into the space 41 between the tool engagement portion 37 of the grease supply valve 31 and the stopper 40, and the notch 42D of the contact plate 42B is The outer peripheral surface of the oil supply valve 31 (the valve body 32) is engaged in the space 41.
  • the crawler belt tension adjusting device 21 has the configuration as described above, and its operation will be described next.
  • the oil supply valve 31 is fixed to the valve mounting hole 30, and the valve portion 32G of the valve main body 32 is seated on the valve seat 29C formed in the grease passage 29. There is.
  • the seal ring 39 of the oil supply valve 31 resiliently abuts on the inner peripheral surface of the cylindrical hole 30C that constitutes the valve mounting hole 30. In this state, the distance B from the open end 30B of the valve mounting hole 30 to the axial intermediate position 39A of the seal ring 39 is set smaller than the pitch A of the male screw 35 of the oil supply valve 31 (B ⁇ A ).
  • the distance B corresponds to the radius (R / 2) of the diameter R of the circular cross section of the seal ring 39 (B ⁇ R / 2 ⁇ A).
  • the stopper 40 of the oil supply valve 31 faces the contact plate 42B of the valve retaining plate 42 attached to the holder 26 of the frame side rod 24 with an interval C.
  • the seal ring 39 attached to the annular groove 38 of the lubrication valve 31 elastically abuts on the inner peripheral surface of the cylindrical hole 30C of the valve mounting hole 30.
  • the seal ring 39 seals between the outer peripheral surface of the valve body 32 of the oil supply valve 31 and the inner peripheral surface of the valve mounting hole 30 in a fluid-tight manner. Therefore, even when the hydraulic shovel 1 performs work on a mud ground, the seal ring 39 reliably prevents the entry of mud water or the like into the valve mounting hole 30.
  • the male screw 35 of the lubrication valve 31 and the female screw hole 30A of the valve mounting hole 30 can be prevented from being corroded at an early stage.
  • the amount of projection of the frame side rod 24 with respect to the tube 22 is increased by supplying grease into the grease chamber 28 of the tube 22.
  • a grease gun (not shown) is inserted into the working opening 7E opened in the outer side plate 7D of the side frame 7, and the grease gun is connected to the grease nipple 33 of the lubrication valve 31.
  • the oil supply valve 31 is attached to a valve mounting hole 30 formed coaxially with the radial direction passage 29B of the grease passage 29, and is disposed orthogonal to the front and rear directions of the side frame 7 .
  • the grease nipple 33 of the lubrication valve 31 is disposed toward the work opening 7E, the operator simply inserts the grease gun into the work opening 7E to grease the grease gun. It can be easily connected to the nipple 33.
  • the grease gun discharges the grease.
  • the grease opens the check valve mechanism 34 through the grease filling hole 32C of the lubrication valve 31, and further the grease chamber 28 in the tube 22 is filled through the grease passage 29 provided in the frame side rod 24.
  • the frame side rod 24 extends from the tube 22 in accordance with the amount of grease filled in the grease chamber 28.
  • the frame side rod 24 can move the idler wheel 10 in the direction away from the drive wheel 11 via the yoke 9, and can increase the tension of the crawler belt 13.
  • the frame side rod 24 is contracted in the tube 22 by discharging the grease filled in the grease chamber 28.
  • the grease supply valve 31 is loosened from the valve mounting hole 30.
  • the valve portion 32G of the valve body 32 leaves the valve seat 29C of the grease passage 29, and the seal ring 39 of the grease supply valve 31 disengages from the cylindrical hole 30C of the valve mounting hole 30 to the outside.
  • the grease in the grease chamber 28 is drawn out from the grease passage 29 to the cylindrical hole 30C of the valve mounting hole 30 through the grease discharge groove 36 of the valve body 32, and then the outer peripheral surface 32B of the valve body 32 and The air is discharged to the outside from between the valve mounting hole 30 and the open end 30B.
  • the seal ring 39 can be separated from the cylindrical hole 30C of the valve mounting hole 30 within one rotation after the male screw 35 of the lubrication valve 31 begins to loosen from the female screw hole 30A of the valve mounting hole 30. Specifically, as shown in FIG. 5 and FIG. 6, while making the grease supply valve 31 rotate one turn, the grease supply valve 31 is separated from the valve mounting hole 30 by the pitch A of the male screw 35 And the seal ring 39 can be released from the cylindrical hole 30C of the valve mounting hole 30 (see FIGS. 7 and 8).
  • the crawler belt tension adjusting device 21 can suppress the discharge amount of the grease from the inside of the grease chamber 28 and can gradually weaken the tension of the crawler belt 13, so that it is possible to perform delicate tension adjustment.
  • the crawler belt tension adjusting device 21 can increase the amount of grease discharged from the inside of the grease chamber 28 and can quickly reduce the tension of the crawler belt 13.
  • the stopper 40 of the grease supply valve 31 abuts on the contact plate 42B of the valve retaining plate 42 mounted on the holder 26 of the frame side rod 24, whereby the movement amount of the grease supply valve 31 can be regulated. .
  • the valve portion 32G of the grease supply valve 31 is seated on the valve seat 29C of the grease passage 29 so that the outer peripheral surface of the valve body 32 and the cylinder of the valve mounting hole 30 A seal ring 39 mounted in an annular groove 38 of the valve body 32 can seal the space between the inner peripheral surface of the hole 30C and the hole 30C.
  • the grease in the grease chamber 28 utilizes the grease discharge groove 36 by the valve portion 32G of the grease supply valve 31 moving away from the valve seat 29C of the grease passage 29. Are discharged to the outside. For this reason, the crawler belt tension adjusting device 21 according to the present embodiment does not need to have two greasing valves, one for the grease injection valve and the other for the grease discharge valve as in the prior art. can do.
  • the distance B from the open end 30B of the valve mounting hole 30 to the axial intermediate position 39A of the seal ring 39 is The pitch is set smaller than the pitch A of the male screw 35.
  • the gap between the valve portion 32G of the valve mounting hole 30 and the valve seat 29C It can be kept small.
  • the amount of discharged grease can be suppressed to a small amount, and the tension of the crawler belt 13 can be gradually weakened, so that the delicate tension adjustment to the crawler belt 13 can be performed.
  • the crawler belt tension adjustment device 21 can increase the amount of discharged grease, and can improve the workability of the work of adjusting the tension of the crawler belt 13.
  • the frame side rod 24 is configured by the rod body 25 and the holder 26 integrally attached to the rear end of the rod body 25 is illustrated.
  • the present invention is not limited to this.
  • the frame side rod 50 may be configured to integrally form the cylindrical portion 50A and the holder portion 50B.
  • the crawler belt tension adjusting device 21 used for the lower traveling body 2 of the hydraulic shovel 1 is described as an example.
  • the present invention is not limited to this, and can be widely applied to, for example, a vehicle having a crawler type lower traveling body such as a hydraulic crane and a bulldozer.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • General Details Of Gearings (AREA)

Abstract

L'invention concerne un dispositif caractérisé en ce qu'un passage (29) de graisse doté d'un siège (29C) de soupape est pratiqué dans une tige (24) côté bâti. Un trou (30) de montage de soupape est pratiqué entre le siège (29C) de soupape du passage (29) de graisse et une extrémité (30B) d'ouverture dont est dotée la tige (24) côté bâti. Le trou (30) de montage de soupape comporte un trou fileté femelle (30A) pratiqué du côté du siège (29C) de soupape de celui-ci, et comporte également un trou cylindrique circulaire (30C) pratiqué du côté de l'extrémité (30B) d'ouverture de celui-ci. Un graisseur (31) est muni d'une section (32G) de soupape qui est mise en appui sur le siège (29C) de soupape, d'un filetage mâle (35) qui coopère avec le trou fileté femelle (30A), et d'une gorge annulaire (38). Un joint (39) d'étanchéité est monté dans la gorge annulaire (38). La distance (B) de l'extrémité (30B) d'ouverture du trou (30) de montage de soupape à la position intermédiaire (39A) du joint (39) d'étanchéité dans la direction axiale est fixée de telle manière que, la section (32G) de soupape du graisseur (31) étant en appui sur le siège (29C) de soupape, la distance (B) est inférieure au pas (A) du filetage mâle (35).
PCT/JP2013/079856 2012-11-06 2013-11-05 Dispositif de réglage de tension d'une bande de chenille WO2014073519A1 (fr)

Priority Applications (1)

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JP2014545702A JPWO2014073519A1 (ja) 2012-11-06 2013-11-05 履帯張り調整装置

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JP2012-244357 2012-11-06
JP2012244357 2012-11-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020015406A (ja) * 2018-07-25 2020-01-30 日立建機株式会社 履帯張り調整装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5237221A (en) * 1975-09-17 1977-03-23 Caterpillar Tractor Co Filling and relief valve means
JPS60263B2 (ja) * 1974-05-01 1985-01-07 デイーア・アンド・カンパニー 液圧式軌道調節装置
JPS6215597Y2 (fr) * 1982-05-13 1987-04-20
JP2012148592A (ja) * 2011-01-17 2012-08-09 Hitachi Constr Mach Co Ltd 履帯張り調整装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60263B2 (ja) * 1974-05-01 1985-01-07 デイーア・アンド・カンパニー 液圧式軌道調節装置
JPS5237221A (en) * 1975-09-17 1977-03-23 Caterpillar Tractor Co Filling and relief valve means
JPS6215597Y2 (fr) * 1982-05-13 1987-04-20
JP2012148592A (ja) * 2011-01-17 2012-08-09 Hitachi Constr Mach Co Ltd 履帯張り調整装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020015406A (ja) * 2018-07-25 2020-01-30 日立建機株式会社 履帯張り調整装置

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