JP2020051165A - Construction machine - Google Patents

Abstract

To provide a construction machine that can reliably prevent an adjuster valve from coming out by accident when the adjuster valve is loosened to discharge grease.SOLUTION: An adjuster cylinder 16 is disposed in a side frame 15 of an undercarriage 2. Tension of a caterpillar 3e for a crawler 3 is adjusted correspondingly to supplying and discharging grease to/from an adjuster valve 20 that is screwed onto a peripheral surface of the adjuster cylinder 16. An adjustment hole 24 in a keyhole shape penetrates a side wall 15a of the side frame 15. A grease adjustment tool 22 is inserted into the side frame 15 from an insertion area 24a of the adjustment hole 24 and moved to a rotational operation area 24b. The adjuster valve 20 is loosened when discharging grease. At this time, when the screwed adjuster valve 20 is released due to incorrect operation, the grease adjustment tool 22 is moved to the side wall 15a together with the adjuster valve 20 that receives grease pressure, and a stepped surface 22c that is formed on the peripheral surface hits a barrier surface E of the side wall 15a.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a construction machine including a crawler.

  For example, a construction machine such as a hydraulic shovel or a bulldozer is provided with a pair of left and right crawlers. Each crawler is configured by winding an annular crawler belt around a driving sprocket, an idler, a track roller, and a carrier roller. The crawler belt is driven by a driving sprocket to drive the construction machine, and the crawler belt gradually wears and decreases in tension with its operation. Therefore, a tension adjustment operation is performed on a regular basis.

  For example, as described in Patent Literature 1, tension of a crawler belt is provided by an adjuster cylinder connected to an idler via a compression spring. An adjuster valve is screwed into one side of the adjuster cylinder, and grease is supplied to and discharged from the adjuster cylinder through the adjuster valve.Accordingly, the idler is displaced in the front-rear direction to reduce the tension of the crawler belt. Adjusted.

  When the grease is discharged from the adjuster cylinder to reduce the tension of the crawler belt, the adjuster valve is loosened through the adjustment hole of the cover covering the adjuster cylinder. A discharge groove is formed in the adjuster valve, and when the adjuster valve is loosened, the inside of the adjuster cylinder communicates with the outside through the discharge groove to discharge grease. When the screw of the adjuster valve receiving the high grease pressure in the adjuster cylinder is released, the adjuster valve may inadvertently pop out through the adjustment hole of the cover (hereinafter, simply referred to as "adjusting of the adjuster valve"). In some cases). For this reason, the loosening operation needs to be stopped before the screwing is released (still in the middle of screwing), with the inside and outside communicating with each other via the discharge groove.

  However, not all operators perform the grease discharging operation correctly, and some operators release the adjuster valve screwing carelessly. Therefore, for example, a bracket made of a steel plate is fixed with bolts in the vicinity of the adjuster cylinder, and at a position just before the above-mentioned screwing is released, the tip of the bracket is brought into contact with one side of the adjuster valve to loosen further. Measures have been implemented to regulate operations.

Japanese Utility Model Publication No. 3-59288

However, the conventional countermeasure using the bracket cannot reliably prevent an erroneous operation by an operator, and there is room for improvement in cost.
That is, an operator who has not correctly performed the grease discharging operation may not understand the role of the bracket itself. For this reason, for example, when the bracket that is fixing the bracket is loosened and the bracket is removed, or when the bracket is deformed by forcibly continuing to loosen despite the restriction by the bracket, the original function of the bracket However, as a result, the pop-out of the adjuster valve could not be prevented.

  As is clear from the above description, the bracket is a member that is permanently installed on the construction machine. For this reason, a pair of brackets corresponding to the crawlers are required for each construction machine, which has a problem that the production cost of the construction machine is affected.

  The present invention has been made to solve such a problem, and an object of the present invention is to ensure that inadvertent pop-outs at the time of loosening and operating an adjuster valve in a crawler belt tension adjusting operation can be performed at a low cost. Another object of the present invention is to provide a construction machine capable of preventing the above.

  In order to achieve the above object, the construction machine of the present invention has an adjuster cylinder disposed in a frame provided with a crawler, and tensions a crawler track of the crawler according to supply and discharge of oil and fat to the adjuster cylinder. In the construction machine, the adjuster valve is screwed into the adjuster cylinder, and the adjuster valve that discharges the oil and fat in the adjuster cylinder by loosening operation, and the distal end is engaged with the adjuster valve when disposed in the frame. An adjusting tool having a stepped surface formed on an outer surface thereof, and an insertion area which is provided through a wall forming an image of the frame and which can insert the adjusting tool into the frame, and A proximal end of the adjusting tool is formed adjacent to the insertion area, and a distal end of the adjusting tool is engaged with the adjuster valve in the frame. An adjusting hole formed by a rotating operation area projected to the outside of the frame to enable loosening operation, and formed on the wall to surround the rotating operation area of the adjusting hole, and when the adjusting tool is loosened And a barrier surface that engages with the step surface to prevent the adjuster valve from jumping out of the adjuster valve.

  ADVANTAGE OF THE INVENTION According to the construction machine of this invention, in the crawler belt tension adjustment work, inadvertent popping out when the adjuster valve is loosened and operated can be reliably prevented at low cost.

It is a side view showing the hydraulic shovel of an embodiment. FIG. 2 is a detailed view of a portion A of FIG. 1 showing a support structure of the idler. FIG. 4 is a side view corresponding to FIG. 2 with a side wall of a side frame removed. FIG. 3 is a detailed view of a portion B in FIG. 2 showing a state in which a grease adjusting tool is inserted into an insertion region of an adjusting hole. FIG. 5 is a sectional view taken along line VV of FIG. 4, showing a state in which a grease adjusting tool is inserted into an insertion region of an adjusting hole. FIG. 3 is a detailed view of a part B in FIG. 2 showing a state in which a grease adjusting tool is moved from an insertion area of an adjustment hole to a rotation operation area side. FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 6, showing a state in which the grease adjuster is moved from the insertion region of the adjustment hole toward the rotation operation region. FIG. 8 is a cross-sectional view corresponding to FIG. 7, showing a state in which the adjuster valve is unscrewed and is prevented from popping out due to a collision of the stepped portion with the barrier surface.

Hereinafter, an embodiment in which the present invention is embodied in a hydraulic excavator will be described.
FIG. 1 is a side view showing a hydraulic shovel of the present embodiment. First, a schematic configuration of the hydraulic shovel will be described with reference to FIG. In the following description, the front, rear, left, right, and up and down directions are mainly expressed by an operator who is mounted on the excavator.

  The lower traveling body 2 of the excavator 1 is provided with a pair of left and right crawlers 3, each of the crawlers 3 includes a driving sprocket 3 a located on the rear side, an idler 3 b located on the front side, a pair of carrier rollers 3 c located on the upper side, An annular crawler belt 3e is wound around a number of track rollers 3d located on the lower side. The crawler belt 3e is driven by a traveling hydraulic motor (not shown) via the driving sprocket 3a, and the hydraulic excavator 1 travels.

  An upper swing body 4 is provided on the lower traveling body 2, and the upper swing body 4 is driven by a turning hydraulic motor (not shown) to turn. An articulated work front 5 is provided at the front of the upper revolving unit 4, and the work front 5 includes a boom 6, an arm 7, and a bucket 8. The angle of the boom 6 is changed by a boom cylinder 6a, the angle of the arm 7 is changed by an arm cylinder 7a, and the angle of the bucket 8 is changed by a bucket cylinder 8a.

  An operator's cab 10 on which an operator rides is provided at a front portion of the upper revolving unit 4 on the frame 9, and a fuel tank 11, a machine room 12, a counterweight 13, and the like are provided at a rear side of the operator's cab 10 on the frame 9. Have been. Although not shown, an engine is mounted in the machine room 12, and the above-described traveling or turning hydraulic motors and the respective cylinders 6a to 8a operate by supply of hydraulic oil from a hydraulic pump driven by the engine.

  Although not shown, the track frame of the undercarriage has side frames 15 (shown in FIGS. 2 and 3 and corresponding to the frame of the present invention) connected to the left and right sides of the center frame. The driven sprocket 3a, idler 3b, carrier roller 3c and track roller 3d are supported.

  FIG. 2 is a detailed view of a portion A in FIG. 1 showing a support structure of the idler 3b, and FIG. 3 is a side view corresponding to FIG. In the following description, the support structure of the idler 3b provided on the left crawler will be described, but the right side has the same symmetric structure.

  The support mechanism for the idler 3b is disposed at a front portion inside the side frame 15, and is concealed from the outside by a side wall 15a (corresponding to a wall forming an image of the present invention) forming a side surface of the side frame 15. The cylinder body 16a of the adjuster cylinder 16 is fixed in the side frame 15, and the retainer 16b is displaced in the front-rear direction in accordance with the amount of grease (corresponding to the grease of the present invention) supplied therein. ing.

The idler 3b is rotatably supported by a yoke 17, and a compression spring 18 is interposed between the yoke 17 and a retainer 16b of the adjuster cylinder 16. When the retainer 16b is displaced in the front-rear direction by the adjuster cylinder 16, the idler 3b is also displaced in the front-rear direction together with the compression spring 18 and the yoke 17, whereby the tension of the crawler belt 3e is adjusted.
The compression spring 18 has a shock absorbing effect, and when the crushed stone collides with the crawler 3 while the hydraulic excavator 1 is moving forward, the compression spring 18 bends in the compression direction to absorb the shock.

4 is a detailed view of a portion B of FIG. 2 showing an adjuster valve, and FIG. 5 is a sectional view taken along line VV of FIG. 4 showing the adjuster valve. 4 and 5 show an adjusting hole formed in the side wall 15a of the side frame 15 and a grease adjusting tool (corresponding to the adjusting tool of the present invention) inserted into the insertion region of the adjusting hole.
An adjuster valve 20 is screwed into the outer peripheral surface of the cylinder body 16a of the adjuster cylinder 16 along the axis C1 from the side wall 15a side, and grease is supplied to and discharged from the adjuster cylinder 16 through the adjuster valve 20. You.

  The adjuster valve 20 includes a screw portion 20a screwed into a screw hole 16c penetrating through the cylinder body 16a, a greasing portion 20b protruding from the cylinder body 16a toward the side wall 15a of the side frame 15, and a periphery of the greasing portion 20b. Is formed from a hexagonal nut portion 20c formed in the nut. The tip of the screw portion 20a is in close contact with the cylinder body 16a side to form a metal touch portion X, and the metal touch portion X maintains oil tightness between the inside of the cylinder body 16a and the outside (inside the side frame 15). I have. A grease discharge groove 20e extends from the distal end of the adjuster valve 20 on the outer periphery of the screw portion 20a, one end of which is connected to the metal touch portion X, and the other end is an annular groove formed on the base end side of the screw portion 20a. It communicates with 20f. For this reason, the normal grease discharge groove 20e is shut off from the cylinder body 16a by the metal touch portion X. 20d is an O-ring.

When grease is supplied to the greasing portion 20b of the adjuster valve 20 with a grease gun, the grease is guided into the cylinder body 16a through an internal passage (not shown), and the grease is supplied by a built-in check valve. Backflow is prevented.
When the adjuster valve 20 is loosened by rotating the nut portion 20c (hereinafter, this operation is referred to as a loosening operation), the screw portion 20a gradually protrudes to the outside, and the sealing by the metal touch portion X is released. , O-ring is also released. As a result, the inside of the cylinder body 16a communicates with the outside via the grease discharge groove 20e, and the grease in the cylinder body 16a is discharged to the outside via the grease discharge groove 20e.

The work of adjusting the tension of the crawler belt 3e is performed, for example, in the following procedure.
First, after the hydraulic excavator 1 is jacked up to separate the crawler belt 3e from the ground surface, a height difference L between the lowermost portion of the loose crawler belt 3e and the lower surface of the side frame 15 is measured as shown in FIG. . The height difference L correlates with the tension of the crawler belt 3e. When the height difference L is larger than a specified value, the tension of the crawler belt 3e is insufficient, so that grease is supplied to the adjuster valve 20 with a grease gun. As a result, the amount of grease in the cylinder body 16a of the adjuster cylinder 16 increases, and the tension of the crawler belt 3e is increased by the forward displacement of the idler 3b.

  Conversely, when the height difference L is smaller than the specified value, the tension of the crawler belt 3e is excessive, so that the adjuster valve 20 is loosened to discharge grease. As a result, the amount of grease in the cylinder body 16a decreases, and the tension of the crawler belt 3e is weakened by the rearward displacement of the idler 3b. By repeating the above grease supply and discharge, the crawler belt 3e is adjusted to an optimal tension.

  By the way, as described in [Background Art], if the screwing of the adjuster valve 20 is released at the time of discharging the grease, the adjuster valve 20 accidentally pops out due to the grease pressure. In order to prevent such a problem, in the present embodiment, the adjuster valve 20 is loosened using the grease adjusting tool 22 having a pop-out prevention function, and the configuration thereof will be described below.

FIG. 6 is a detailed view of a portion B in FIG. 2 showing a state in which the grease adjustment tool 22 is moved from the adjustment hole insertion area to the rotation operation area, and FIG. 7 is a rotation operation of the grease adjustment tool 22 from the adjustment hole insertion area. FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 6 showing a state of being moved to a region side.
As shown in FIGS. 4 to 7, the grease adjuster 22 is made of an aluminum material or a steel material and has a cylindrical shape as a whole with the axis C2 as a center. The socket portion 22a that can be fitted into the nut portion 20c is recessed. In addition, a hexagonal nut portion 22b that can engage a tool such as a socket wrench is formed at the base end (the right side in FIG. 5) of the grease adjusting tool 22.

  A step surface 22c is formed on the outer peripheral surface (corresponding to the outer surface of the present invention) of the grease adjusting tool 22 over the entire circumferential direction. , Large diameter portion 22d) is set to be larger than outer diameter D3 of the base end portion (hereinafter, referred to as small diameter portion 22e). Therefore, the step surface 22 c has an annular shape facing the base end side of the grease adjusting tool 22.

  The grease adjuster 22 has a through hole 22f extending along the axis C2. One end of the through hole 22f opens in the socket 22a, and the other end opens on the nut 22b. Therefore, when the socket portion 22a of the grease adjuster 22 is fitted into the nut portion 20c of the adjuster valve 20, the tip of a grease gun is inserted into the through hole 22f to supply grease to the greasing portion 20b of the adjuster valve 20. Fat is possible.

On the other hand, an adjusting hole 24 is provided in the side wall 15 a of the side frame 15 for operating the adjuster valve 20 from outside using the grease adjusting tool 22.
As a whole, the adjustment hole 24 has a keyhole shape formed by a large-diameter circular insertion region 24a and a small-diameter circular operation region 24b. 6, the rotation operation area 24b of the adjustment hole 24 is formed so as to coincide with the axis C2 of the adjuster valve 20, and an insertion area 24a is formed adjacent to the front side of the rotation operation area 24b. I have. The position of the insertion area 24a with respect to the rotation operation area 24b is not limited to the front side as long as the same keyhole-shaped adjustment hole 24 is formed, and may be formed at the rear side of the rotation operation area 24b. Alternatively, it may be formed on the upper side or the lower side.

As shown in FIG. 5, the inner diameter D1 of the insertion region 24a is set slightly larger than the outer diameter D2 of the large diameter portion 22d of the grease adjuster 22, and the grease adjuster 22 is inserted into the side frame 15 through the insert region 24a. It can be inserted into. Further, the inner diameter of the rotation operation area 24b is shown in FIG. 7 as the same diameter as the outer diameter D3 of the small diameter portion 22e of the grease adjuster 22, but is much smaller than the outer diameter D3 due to a so-called clearance fit tolerance setting. It is set slightly larger.
However, the setting of the inner diameter of the rotation operation area 24b is not limited to this, and any setting is possible as long as it is larger than the outer diameter D3 of the small diameter portion 22e of the grease adjuster 22 and smaller than the outer diameter D2 of the large diameter portion 22d. Can be arbitrarily changed.

  In a state where the small diameter portion 22e of the grease adjuster 22 is located in the rotation operation area 24b of the adjustment hole 24, the socket portion 22a can be fitted into the nut portion 20c of the adjuster valve 20 as shown in FIG. 22b protrudes outside the side frame 15 via the rotation operation area 24b. As described above, since the inner diameter of the rotation operation region 24b is larger than the outer diameter D3 of the small diameter portion 22e, the adjuster valve 20 is loosened by engaging a tool with the nut portion 22b of the grease adjusting tool 22 and rotating the tool. While it is possible, the displacement of the grease adjusting tool 22 in the direction of the axis C2 is also allowed.

  6, the step surface 22c of the grease adjuster 22 is opposed to a hatched arc-shaped region E formed on the side wall 15a so as to surround the rotation operation region 24b. The adjuster valve 20 is prevented from jumping out due to collision between the adjuster valve 20 and the step surface 22c, and is hereinafter referred to as a barrier surface E.

The position of the step surface 22c in the direction of the axis C2 of the grease adjuster 22 is set as follows.
As shown in FIG. 7, the adjuster valve 20 is moved from the screwed state of the adjuster valve 20 to the cylinder body 16a to the state in which the sealing of the metal touch portion X is released by the above-mentioned loosening operation and the grease is discharged. Let L3 be the amount of movement. On the other hand, the moving amount of the adjuster valve 20 until the loosening operation is continued and the protrusion occurs due to the release of the screw engagement is set to L2 (> L3).

  On the other hand, with the socket portion 22a of the grease adjusting tool 22 fitted in the nut portion 20c of the adjuster valve 20, the step surface 22c is separated from the side wall 15a of the side frame 15 by a distance L1, and this distance L1 is Is set to be larger than the movement amount L2 until the adjuster valve 20 is released from the screw engagement.

Next, a procedure performed by an operator when the grease adjuster 22 configured as described above is used for adjusting the tension of the crawler belt 3e will be described.
First, after the hydraulic excavator 1 is jacked up as described with reference to FIG. 1, the nut portion 22 b of the grease adjusting tool 22 is gripped and externally inserted into the insertion region 24 a of the adjusting hole 24 as shown in FIGS. insert. The grease adjusting tool 22 is disposed in the side frame 15 and moves the grease adjusting tool 22 from the insertion area 24a to the rotation operation area 24b while holding the nut portion 22b as shown in FIGS. The small diameter portion 22e fits into the rotation operation area 24b. As a result, the step surface 22c of the grease adjuster 22 faces the barrier surface E of the side wall 15a. Then, the socket portion 22a is fitted into the nut portion 20c of the adjuster valve 20 while pushing the nut portion 22b into the adjustment hole 24 by relying on the feel of the hand.

In this state, if it is determined that the tension of the crawler belt 3e is insufficient based on the measured height difference L, the tip of the grease gun is inserted into the through hole 22f of the grease adjusting tool 22 to supply grease to the adjuster valve 20. I do.
If it is determined that the tension of the crawler belt 3e is excessive based on the height difference L, the tool is engaged with the nut portion 22b of the grease adjuster 22 to perform the loosening operation. The adjuster valve 20 moves toward the side wall 15a in response to the loosening operation, and accordingly, the distance L1 between the step surface c of the grease adjusting tool 22 shown in FIG. 7 and the barrier surface E of the side wall 15a gradually decreases. When the screwing of the adjuster valve 20 is released by the moving amount L3, the grease starts to be discharged from the adjuster valve 20, and when the desired amount of discharge is reached, the grease adjuster 22 is rotated in the reverse direction to reset the adjuster valve 20. Return to the screwed state.

  A normal operation of loosening the adjuster valve 20 uses a socket wrench or the like, and the grease is discharged into the side frame 15. Therefore, it is difficult for an operator to visually recognize the discharge amount. When the grease adjuster 22 of the present embodiment is used, the grease discharged from the adjuster valve 20 is guided to the outside of the side frame 15 through the through hole 22f. Therefore, the operator can easily grasp the amount of discharged grease visually, and can stop discharging the grease at a desired amount. As a result, the repetition of grease lubrication and discharge for adjusting the tension of the crawler belt 3e to the optimal level is minimized, and the adjustment operation can be performed efficiently.

  In addition, by forming the through holes 22f, it is possible to perform not only the discharge of the grease but also the lubrication while the grease adjusting tool 22 is mounted on the adjuster valve 20. Grease supply and discharge are repeated for optimal tension adjustment of the crawler belt 3e, but since the grease adjuster 22 does not need to be attached and detached each time, this factor also greatly contributes to efficient adjustment work.

  On the other hand, if the operator correctly understands the grease discharging operation as described above, the loosening operation is stopped when the start of grease discharging from the through hole 22f is confirmed (corresponding to the moving amount L3). However, in the case of an operator who does not understand correctly, the loosening operation is continued, and when the movement amount L2 shown in FIG. 7 is reached, the screwing is released, and the adjuster valve 20 jumps out.

  At this time, since the distance L1 between the step surface 22c of the grease adjuster 22 and the side wall 15a of the side frame 15 still remains, the grease adjuster 22 is moved along the axis C2 together with the adjuster valve 20 subjected to the grease pressure. Then, as shown in FIG. 8, the step surface 22c collides with the side wall 15a, more specifically, the barrier surface E on the periphery of the rotation operation area 24b shown in FIG. Since the side wall 15a of the side frame 15 has a sufficient thickness, the side wall 15a receives the grease adjusting tool 22 with a sufficient margin, and as a result, the situation in which the adjuster valve 20 jumps out together with the grease adjusting tool 22 through the adjusting hole 24 of the side wall 15a is prevented. Therefore, even if an operator who does not understand the grease discharging operation properly adjusts the tension of the crawler belt 3e, it is necessary to loosen the adjuster valve 20 and to prevent the inadvertent popping-out operation. Can be.

  On the other hand, if the grease adjusting tool 22 of the present embodiment has a common condition such as the shape of the adjusting hole 24 and the distance between the adjuster valve 20 and the side wall 15a, the grease adjusting tool 22 includes not only the hydraulic excavator 1 but also a crawler having a crawler. It can be used between construction machines because it is used for other construction machines. The only necessary countermeasure on the hydraulic excavator 1 side is to form the adjustment hole 24 in the side wall 15a of the left and right side frames 15. As a result, the present invention can be implemented at a very low cost as compared with the related art in which a bracket must be permanently installed for each construction machine.

  The adjustment hole 24 to be formed in the side wall 15a has a keyhole shape. The side wall 15a is a member that requires extremely high strength to form the side surface of the side frame 15 that supports the crawler 3. Therefore, the opening formed in the side wall 15a is required to have a minimum area regardless of the purpose, and this requirement is the same for the adjustment hole 24.

  As is clear from the above description, the insertion area 24a of the adjustment hole 24 has a minimum shape (slightly larger than the outer diameter D2 of the large-diameter portion 22d) into which the grease adjuster 22 can be inserted from the outside. The area 24b has a minimum shape (the outer diameter D3 of the small-diameter part 22e and the outer diameter of the large-diameter part 22d) that allows the nut part 22b of the grease adjuster 22 to protrude to the outside and prevent the grease-adjusting tool 22 from jumping out. Smaller than D2). As a result, since the adjustment hole 24 itself is also kept to the minimum necessary opening area, it is possible to achieve the above-described operation and effect while keeping the side wall 15a and the side frame 15 high in rigidity.

  However, the adjusting hole 24 of the present invention is not limited to a keyhole shape, and may be arbitrarily changed as long as the adjusting hole 24 has a shape including an insertion area 24a into which the grease adjusting tool 22 can be inserted and a rotation operation area 24b capable of preventing pop-out. Can be.

  The description of the embodiment is finished above, but aspects of the present invention are not limited to this embodiment. For example, in the above embodiment, the excavator 1 is embodied, but the invention is not limited to a construction machine provided with a crawler, and may be applied to, for example, a bulldozer.

  In the above-described embodiment, the adjuster valve 20 has both the function of grease supply and the discharge of grease. However, the present invention is not limited to this. For example, the adjuster valve 20 has a function of only discharging grease, May be implemented by using a nipple or the like.

  In the above embodiment, the distance L1 between the step surface 22c of the grease adjuster 22 and the side wall 15a of the side frame 15 is set to be larger than the movement amount L2 until the adjuster valve 20 is released from the screw engagement. It is not limited. For example, the distance L1 may be set as a value larger than the movement amount L3 until the grease is discharged from the adjuster valve 20 by the loosening operation and smaller than the movement amount L2 until the screwing is released.

  In this case, if the loosening operation is continued despite the grease being discharged, the step surface 22c of the grease adjusting tool 22 contacts the barrier surface E of the side wall 15a before the screwing is released. The high-strength side wall 15a receives the step surface 22c without being deformed like a conventional bracket. Therefore, further loosening operation is restricted, and the disengagement of the adjuster valve 20 is prevented beforehand, so that the same effect as in the above embodiment can be obtained.

1 Hydraulic excavator (construction equipment)
3 Crawler 3e Crawler track 15 Side frame (frame)
15a Side wall (wall surface)
16 Adjuster cylinder 20 Adjuster valve 22 Grease adjuster (adjuster)
22c Stepped surface 22d Large diameter portion 22e Small diameter portion 22f Through hole 24 Adjusting hole 24a Insertion region 24b Rotation operation region E Barrier surface

Claims (5)

A construction machine that arranges an adjuster cylinder in a frame provided with a crawler and adjusts the tension of the crawler track of the crawler according to the supply and discharge of oil and fat to the adjuster cylinder,
An adjuster valve that is screwed into the adjuster cylinder and discharges oil and fat in the adjuster cylinder by a loosening operation;
An adjusting tool having a stepped surface formed on an outer surface thereof, which can be loosened by engaging the tip with the adjuster valve when disposed in the frame, and
An insertion area is provided through a wall forming an image of the frame, and an insertion area in which the adjustment tool can be inserted into the frame, and is formed adjacent to the insertion area, and a tip of the adjustment tool in the frame is An adjustment hole formed by a rotation operation area that allows the base end of the adjustment tool to protrude to the outside of the frame and be loosened when engaged with the adjuster valve;
A barrier surface formed on the wall surface so as to surround the rotation operation region of the adjustment hole, and engaging with the step surface to prevent the adjuster valve from projecting outside when the adjustment tool is loosened. A construction machine comprising: The adjuster has a cylindrical shape including a large-diameter portion on the distal end side and a small-diameter portion on the proximal end side, and the step surface has an annular shape facing the proximal end side between the large-diameter portion and the small-diameter portion. Is formed,
The adjustment hole is a circular insertion region larger than the outer diameter of the large diameter portion of the adjustment tool, and a circle larger than the outer diameter of the small diameter portion of the adjustment tool and smaller than the outer diameter of the large diameter portion. The construction machine according to claim 1, wherein the construction machine has a keyhole shape formed by the rotary operation region having a shape. The said barrier surface collides with the step surface of the said adjustment tool which moves to the said wall surface side with the said adjuster valve which received the grease pressure, when the screwing of the said adjuster valve is released, The claim characterized by the above-mentioned. 2. The construction machine according to 1. 2. The construction according to claim 1, wherein the barrier surface is in contact with a stepped surface of the adjuster before the screwing of the adjuster valve is released, thereby preventing the screwing of the adjuster valve from being released. 3. machine. The construction machine according to claim 1, wherein a through hole is provided in the adjustment tool from a distal end to a proximal end.

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