JP5633481B2 - Undercarriage of crawler type work machine - Google Patents

Description

  The present invention relates to a lower traveling body of a work machine that travels by left and right crawler traveling devices such as a hydraulic excavator.

  The background art will be described taking a lower traveling body of a hydraulic excavator as an example.

  8 and 9 show a schematic configuration of the lower traveling body of the large excavator.

  This lower traveling body is composed of a car body 1 and left and right crawler traveling devices 2 and 2 (reference numerals are given only to FIG. 9).

  The car body 1 is provided with a swivel base 3 on the upper surface of the central portion, and an upper revolving body (not shown) is mounted on the swivel base 3 via a swivel bearing so as to be turnable.

  Each of the crawler type traveling devices 2 and 2 includes a crawler frame 4 that is detachably attached to both left and right sides of the car body 1 and a crawler 5 that is wound around the outer periphery of the crawler frame 4. 9, a drive wheel 6 provided at the rear end portion of the crawler frame 4, an idler wheel 7 provided at the front end portion, and a hydraulic drive that is installed at the rear end portion of the crawler frame and rotationally drives the drive wheel 6. The crawler 5 is driven by the motor 8 and the lower traveling body travels.

  In this specification, the “front-rear” directionality with respect to the lower traveling body is based on a predetermined forward / backward direction of the lower traveling body.

  Since the hydraulic pump that supplies pressure oil to the left and right traveling motors 6 and 6 and the tank that receives the oil from the motors 6 and 6 are installed on the upper revolving unit side, the upper revolving unit side and the lower traveling unit side A swivel joint 9 for exchanging oil between the two is provided at the center portion of the swivel base 3 (the swivel center portion of the upper swing body), and the hydraulic pipe connecting the swivel joint 9 and the left and right travel motors 8 and 8 10, 10 (usually a flexible hose, hereinafter referred to as a hose) is routed along the car body 1 and the crawler frames 4 and 4 (see Patent Document 1).

  Here, in the large excavator, since the car body 1 and the left and right crawler type traveling devices 2 and 2 are separately transported and assembled on site, the hoses 10 and 10 are also passed through the car body 1 side. It is divided into a section 10a and a crawler frame side section 10b passed through the crawler frame 4, and is configured to be connected / disconnected by a joint 11 (see FIGS. 10 and 11).

  The hose connection portion by the joint 11 is connected to the car body 1 and the traveling device 2 (crawler frame 4), that is, the rear side of the corner portion formed by the car body 1 and the crawler frame 4 so that the connection / separation operation can be performed from the outside. It is arranged to be exposed outside.

  The exposed both-side hose connection portions are concealed from the outside by protective covers 12 and 12 as shown in FIGS.

  Conventionally, the protective covers 12 and 12 are bolted to the car body 1 and the crawler frames 4 and 4 (or one of them) and removed when the hose connection portion is connected / disconnected. In FIG. 10, 13 are a plurality of bolts for attaching the cover.

  On the other hand, when both the crawler type traveling devices 2 and 2 are attached to and detached from the car body 1 and when the car body 1 is loaded onto the trailer, the front side of the car body 1 is used as a means for lifting the car body 1 to the ground. A front-side transformer lifter (also called a jack) 14 is provided on the rear side, and a rear-side transformer lifter 15 is provided on the rear side, respectively (see Patent Document 2).

  The both-side transformer lifters 14 and 15 include an arm 17 whose base end is attached to the car body 1 by a lifter support shaft 16 in the vertical direction, and a lift cylinder 18 provided at the tip of the arm 17. With the shaft 16 as the center, the front transformer lifter 14 protrudes forward of the car body 1 and the rear transformer lifter 15 protrudes rearward of the car body 1 (two-dot chain lines in FIGS. 9 and 11). ) And a retracted state along the front or rear surface of the car body 1 (state shown by solid lines in FIGS. 8, 10 and 9, 11), and the car body is lifted by the lift cylinder 18. It is comprised so that 1 can be lifted to the ground.

JP 2005-344376 A JP 2009-40110 A

  According to the conventional cover mounting structure in which the protective covers 12, 12 are bolted to the car body 1 and the crawler frame crawler frame 4 as described above, the hose connection portion is connected / When separating, all bolts 13... Must be installed and removed.

  For this reason, it takes time to attach and detach the protective covers 12 and 12, and this bolt attaching and detaching operation must be performed while supporting the heavy protective covers 12 and 12 with one hand.

  In particular, in large machines, the hose 10 and the joint 11 have a large diameter, the range to be concealed is widened, and the protective covers 12 and 12 are large and heavy, or must be divided into a plurality of parts. However, it was hard work and very inefficient.

  In addition, there is also the annoyance that the protective covers 12, 12 that have been removed during transportation must be stored in another location until the next assembly.

  Therefore, the present invention provides a lower traveling body of a crawler type work machine that can efficiently attach and detach a protective cover with a minimum of labor, labor, and time, and that does not require any troublesome storage.

  As means for solving the above-described problems, the present invention includes all of the following requirements (i) to (vii).

  (i) The upper revolving structure is constituted by a car body in which the upper revolving structure is rotatably mounted, and crawler type traveling devices on both the left and right sides.

  (ii) The crawler type traveling device includes a long crawler frame that is detachably connected to the left and right sides of the car body, a crawler that is wound around the outer periphery of the crawler frames on both sides, and the front and back of the crawler frames on both sides. And left and right traveling motors that are installed on one side and rotationally drive the crawler.

  (iii) Translifters are provided on both the left and right sides of the front and rear sides of the car body.

  (iv) The transformer lifter includes an arm whose base end is attached to the car body by a lifter support shaft in the vertical direction, and a lift cylinder provided at the tip of the arm, with the lifter support shaft as a center, The front transformer lifter pivots between the overhanging state protruding forward of the car body and the rear transformer lifter protruding rearward of the car body and the retracted state along the front or rear surface of the car body. The car body can be lifted to the ground by the lift cylinder in the overhanging state.

  (v) a car body side section that is passed through the car body, and a crawler frame that is passed through the crawler frame through piping connecting the swivel joint installed at the center of the car body and the left and right traveling motors. The car body side section and the crawler frame side section are both exposed to the outside and connected / separated by a joint.

  (vi) A protective cover for concealing the exposed connection portion of both sections from the outside, with the cover cover shaft in the vertical direction as the center, the closed position covering the connection portion, and the connection portion connected / separated from the outside It is possible to rotate between the open position where it can be exposed, and at the open position, a part of the trans lifter on both sides of the front and rear sides of the trans lifter on the side where the traveling motor is provided is in the protruding state. Attached to the crawler frame with a positional relationship overlapping the tip.

  (vii) The protective cover is provided with a cutout portion into which the tip end portion of the translifter in the protruding state is fitted.

  In this way, the joint connection parts on both the car body side and the crawler frame side of the pipes (in this section, the pipes are referred to as hose and the connection parts are referred to as hose connection parts in accordance with the explanation of the background art). The cover to be concealed is attached so that it can be opened and closed with the cover support shaft as the center, and the hose connection part is exposed and connected / separated in the open state, so that the protection cover can be attached and detached (the hose connection part is concealed) In addition, when a plurality of bolts are tightened and detached, the operator does not need to bear the weight of the cover.

  In addition, since the protective cover can be transported at the same time as it is attached to the car body or crawler frame after the hose connection part is separated, it is troublesome to store the removed protective cover separately during transportation, as in the case of bolting. There will be no more.

  Here, in a machine with a translifter that is an object of the present invention, the translifter on the side where the traveling motor is provided (described in the case of the rear side in this section) and the protective cover are located close to each other, and the rear Since the part of the opened protective cover overlaps the tip of the transformer lifter with the side transformer lifted, the situation where the protective cover cannot be opened or the transformer lifter cannot be projected, A situation occurs in which disassembly is not possible.

  Therefore, according to the present invention, the protective cover is provided with a notch portion into which the tip of the transformer lifter in the above-described overhanging state is fitted, so that interference between the protective cover and the transformer lifter during assembly / disassembly is avoided, and assembly / disassembly of the machine is performed. It becomes possible to take an attitude.

  Further, since the rear cover lifter is fitted into the notch, the protective cover is fixed at the open position, so that another means (for example, a bolt) for opening and fixing the cover and its fixing / releasing operation are not required.

  In the present invention, it is desirable to provide a fixed cover on the crawler frame or the car body that closes the notch when the protective cover is closed.

  According to this configuration, since the cutout portion of the protective cover can be closed by the fixed cover when the cover is closed, the hose connection portion can be reliably protected. In other words, there is no adverse effect that the concealing protection effect of the hose connection portion is reduced by providing the notch.

  According to the present invention, the protective cover can be attached and detached efficiently with a minimum of labor, labor, and time, and the trouble of separately storing the protective cover is eliminated.

It is a schematic perspective view of the lower traveling body which concerns on embodiment of this invention. It is a schematic plan view of the lower traveling body in a state where a protective cover is closed. It is a schematic plan view of the lower traveling body in a state where a protective cover is opened. It is an enlarged view of the protective cover part of FIG. FIG. 5 is a view corresponding to FIG. 4 in a state where the protective cover is opened from the state of FIG. 4. FIG. 6 is a view corresponding to FIGS. 4 and 5 in a state where a transformer lifter is extended from the state of FIG. 5. (a) and (b) are the perspective views seen from two different directions of a protective cover. It is a schematic perspective view of the conventional lower traveling body. FIG. It is an enlarged view of the protective cover part of FIG. FIG. 11 is a view corresponding to FIG. 10 in a state where the protective cover is removed from the state of FIG. 10 and the hose connection portion is separated.

  An embodiment of the present invention will be described with reference to FIGS.

  The embodiment is applied to a lower traveling body of a large excavator.

  In the lower traveling body according to the embodiment, the following points are the same as the prior art shown in FIGS.

  (A) A point constituted by the car body 21 and the left and right crawler type traveling devices 22, 22 (only reference numerals are attached to FIGS. 2 and 3).

  (B) The car body 21 is provided with a swivel base 23 on the upper surface of the central portion, and an upper revolving body (not shown) is mounted on the swivel base 23 so as to be turnable via a swivel bearing.

  (C) The crawler type traveling devices 22 and 22 each include a crawler frame 24 that is detachably attached to the left and right sides of the car body 21 and a crawler 25 that is wound around the outer periphery of the crawler frame 24. 2 and 3, a drive wheel 26 provided at the rear end of the crawler frame 24, an idler wheel 27 provided at the front end, and a drive wheel 26 installed at the rear end of the crawler frame. A point in which the crawler 25 is driven by the hydraulic traveling motor 28 that rotates and the lower traveling body travels.

  (D) A swivel joint 29 for transmitting and receiving oil between the upper swing body side and the lower traveling body side is provided at the center portion of the swivel base 23 (the swing center portion of the upper swing body). The hoses 30 and 30 which are hydraulic piping connecting the traveling motors 28 and 28 are routed along the car body 21 and the crawler frames 24 and 24.

  (E) The hoses 30 and 30 are divided into a car body side section 30a that is passed through the car body 21 and a crawler frame side section 30b that is passed through the crawler frame 24, and a joint 31 (see FIGS. 4 to 6). It is configured to be connected / disconnected by

  (F) The hose connection portion by the joint 31 is a connecting portion between the car body 21 and the traveling device 22 (crawler frame 24), that is, a corner portion formed by the car body 21 and the crawler frame 24 so that the connection / separation operation can be performed from the outside. Point that is exposed to the outside on the rear side.

  (G) The exposed both-side hose connection portion is concealed from the outside by the protective covers 32 and 32 so as not to be damaged during work.

  (H) A front translifter 34 is provided on the front side of the car body 21 and a rear translifter 35 is provided on the rear side.

  (I) The both-side transformer lifters 34 and 35 include an arm 37 whose base end is attached to the car body 21 by a lifter support shaft 36 in the vertical direction, and a lift cylinder 38 provided at the tip of the arm 37. With the lifter support shaft 36 as the center, the front transformer lifter 34 projects in front of the car body 21 and the rear transformer lifter 35 projects in the rear of the car body 21 (see FIGS. 3 and 6). State) and a retracted state along the front or rear surface of the car body 21 (states of FIGS. 1, 2, 4 and 5), and the car body 21 can be lifted to the ground by the lift cylinder 38 in the overhanging state. The point that is structured as follows.

  In the embodiment, the protective covers 32 and 32 are attached to the inner (turning center side) surfaces of the crawler frames 24 and 24 by a hinge 39 so as to be freely opened and closed around a vertical hinge shaft (cover support shaft) 39a. It has been.

  Specifically, the cover 32 is between a closed position that covers the hose connection portion as shown in FIGS. 1, 2, and 4, and an open position that exposes the hose connection portion to the outside as shown in FIGS. The front end side portion is attached to the crawler frame 24 so as to overlap the front end portion (hereinafter referred to as lift front end portion) when the rear transformer lifters 35 and 35 are overhanging at the open position. Yes.

  In FIGS. 4 to 6, the protective cover 32 is indicated by a bold line so as to be clearly distinguished from others.

  As shown in FIGS. 7 (a) and 7 (b), the protective cover 32 is generally formed in a U-shape including an upper surface plate 32a, a lower surface plate 32b, and a back plate 32c, and is shown in FIG. 4 in the closed position. The hose connection part including the joint 31 is concealed from the upper surface, the lower surface, and the rear side with respect to the outside, and the hose connection part is exposed from the outside so as to be detachable as shown in FIGS.

  The protective cover 32 is provided with a notch 40 in which the lifter tip fits into a portion (intermediate part) that overlaps the lifter tip (specifically, the tip of the arm 37 and the lift cylinder 38) at the open position. ing.

  In other words, the protective cover 32 is generally L-shaped when viewed from above, and is configured such that the lifter tip fits into the L-shaped corner as the notch 40.

  Further, a fixed cover 41 projects from the rear surface of the car body 21, and the cutout portion 40 is closed by the fixed cover 41 in a state where the protective cover 32 is closed as shown in FIGS. It is configured as follows.

  Specifically, in the closed state of the protective cover 32, a part thereof, that is, a corner part forming the notch part 40 overlaps with the upper surface of the fixed cover 41 so that the notch part 40 is closed.

  Contrary to the above, a part of the protective cover 32 may overlap the lower surface side of the fixed cover 41 so as to close the notch 40, or the cover of the protective and fixed covers 32, 41 may be covered. You may comprise so that the notch part 40 may be plugged up in the state which the end surfaces which oppose in a closed state contact | abut.

  In addition, when a part of the protective and fixed covers 32 and 41 overlap each other, as a means for fixing the protective cover 32 in the closed position, the overlapping portions of the covers 32 and 41 are bolted or pinned. You may take the structure to do.

  Further, means for fixing the protective cover 32 in the open position (for example, means for bolting the crawler frame 24) may or may not be provided.

  As described above, the protective cover 32 that conceals the hose connection portion from the outside is attached by the hinge 39 so that it can be opened and closed, and the hose connection portion is exposed and connected / separated in the open state. When the hose connection part is concealed and removed in a broad sense, it is not necessary to retighten the plurality of bolts, and the operator does not have to bear the weight of the cover.

  Further, since the protective cover 32 can be transported at the same time as it is attached to the crawler frame 24 after separation of the hose connection portion, it is troublesome to remove the protective cover 32 and store it separately during transportation, as in the case of bolting. There will be no more.

  On the other hand, the protective cover 32 is provided with a notch 40 into which the tip of the overhanging transformer lifter 35 is fitted, so that interference between the protective cover 32 and the transformer lifter 35 during assembly / disassembly is avoided, and assembly / disassembly of the machine is performed. It becomes possible to take an attitude.

  In other words, the protective cover 32 and the transformer lifter 35 can be laid out in an optimal state (mounting position and dimensions) for performing their respective functions without worrying about mutual interference.

  Further, since the front end portion of the rear transformer lifter 35 is fitted into the cutout portion 40, the protective cover 32 is fixed at the open position. Therefore, another means (for example, a bolt) for opening and fixing the cover 32 and fixing / releasing thereof. No operation is required.

  Furthermore, since the cutout portion 40 of the protective cover 32 can be closed by the fixed cover 41 when the cover is closed, the hose connection portion can be reliably protected. In other words, the provision of the notch 40 does not cause the adverse effect that the concealing protection effect of the hose connection portion is reduced.

  By the way, although the protective cover 32 is attached to the crawler frame 24 in the above embodiment, it may be attached to the car body 21.

  Moreover, you may attach the protective cover 32 not by the hinge 39 but by the pin and bracket as a cover spindle.

  Furthermore, the present invention can also be applied to a case where an electric motor is used as a traveling motor in a hybrid excavator, an electric excavator, or the like, that is, a configuration in which a connecting portion of a wiring connecting the swivel joint 29 and the traveling motor is concealed by a protective cover.

  Further, the present invention is not limited to the lower traveling body of the excavator, but can be applied to other crawler type work machines such as a dismantling machine and a crusher configured with the excavator as a base body in the same manner as the above embodiment.

21 Car body 22 Crawler type traveling device 24 Crawler frame of crawler type traveling device 25 Same as above, Crawler 26 Same as driving wheel 27 Same as idle wheel 28 Same as traveling motor 29 Swivel joint 30 Hose (piping)
30a Hose car body side section 30b Same as above, crawler frame side section 31 Joint 32 Protective cover 34 Front transformer lifter 35 Rear transformer lifter 36 Lifter spindle 37 Arm 38 Lift cylinder 39 Hinge 39a Hinge shaft (cover spindle)
40 Notch of protective cover 41 Fixed cover

Claims (2)

A lower traveling body of a crawler type work machine, characterized by having all of the following requirements (i) to (vii):
(i) The upper revolving structure is constituted by a car body in which the upper revolving structure is rotatably mounted, and crawler type traveling devices on both the left and right sides.
(ii) The crawler type traveling device includes a long crawler frame that is detachably connected to the left and right sides of the car body, a crawler that is wound around the outer periphery of the crawler frames on both sides, And left and right traveling motors that are installed on one side and rotationally drive the crawler.
(iii) Translifters are provided on both the left and right sides of the front and rear sides of the car body.
(iv) The transformer lifter includes an arm whose base end is attached to the car body by a lifter support shaft in the vertical direction, and a lift cylinder provided at the tip of the arm, with the lifter support shaft as a center, The front transformer lifter pivots between the overhanging state protruding forward of the car body and the rear transformer lifter protruding rearward of the car body and the retracted state along the front or rear surface of the car body. The car body can be lifted to the ground by the lift cylinder in the overhanging state.
(v) a car body side section that is passed through the car body, and a crawler frame that is passed through the crawler frame through piping connecting the swivel joint installed at the center of the car body and the left and right traveling motors. The car body side section and the crawler frame side section are both exposed to the outside and connected / separated by a joint.
(vi) A protective cover for concealing the exposed connection portion of both sections from the outside, with the cover cover shaft in the vertical direction as the center, the closed position covering the connection portion, and the connection portion connected / separated from the outside It is possible to rotate between the open position where it can be exposed, and at the open position, a part of the trans lifter on both sides of the front and rear sides of the trans lifter on the side where the traveling motor is provided is in the protruding state. Attached to the crawler frame with a positional relationship overlapping the tip.
(vii) The protective cover is provided with a cutout portion into which the tip end portion of the translifter in the protruding state is fitted.   2. The lower traveling body of a crawler type work machine according to claim 1, wherein a fixed cover that closes the notch in a state where the protective cover is closed is provided on the crawler frame or the car body.

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