JP2011084132A - Tracked vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mount a rear end side of a crawler tension regulating device in a positioning state with a simple structure on a side frame. <P>SOLUTION: A pair of crawler tension brackets 27 and 28 are provided on an upper plate 7A of the side frame 7. A cylindrical body 26 provided in a frame side rod 21 to be the rear end part of a buffer mechanism 17 of the crawler tension regulating device 15 is rotatably connected to the brackets 27 and 28 via a connecting pin 29. The frame side rod 21 of the buffer mechanism 17 therefore can be mounted in the positioning state on each crawler tension bracket 27 and 28 on the side frame 7 side. Each of the crawler tension brackets 27 and 28 is capable of being easily formed from a plate body and efficiently receiving load from an idler 9 and the crawler tension regulating device 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tracked vehicle including a crawler track that is suitably used as a construction machine such as a hydraulic excavator or a hydraulic crane.

  Generally, a tracked vehicle such as a hydraulic excavator or a hydraulic crane includes a tracked lower traveling body that can be self-propelled, an upper revolving body that is turnably mounted on the lower traveling body, and an upper revolving body. It is roughly constituted by a working device provided so as to be able to move up and down.

  The track-type lower traveling body includes a track frame having side frames extending in the front and rear directions on both the left and right sides of the center frame, and a front and rear side of the left and right side frames. An idler wheel provided, a drive wheel provided on the other side in front and rear of each side frame and driven by a hydraulic motor or the like, and a crawler belt wound around the idler wheel and the drive wheel And a crawler belt tension adjusting device provided between the side frame and the idler wheel and positioned in the side frame for adjusting the tension of the crawler belt.

  In addition, a partition wall is provided inside the side frame constituting the track frame so as to be located on the idler wheel side, and the partition wall extends in the left, right direction, upward, and downward directions perpendicular to the moving direction of the yoke. The peripheral part is fixed to the side frame by welding.

  On the other hand, the crawler belt tension adjusting device is attached to the rear end portion of the yoke, which is disposed in the side frame and supports the idler wheel movably in the front and rear directions at the front end portion on one side of the side frame. It is comprised by the buffer mechanism which expands-contracts in the front and back direction between side frames. And in the buffer mechanism, in order to receive the load from an idle wheel, the end surface part of the rod extended from the rear-end side of a tube is contact | abutting to the partition (for example, refer patent document 1).

JP-A-9-144064

  By the way, in the invention of Patent Document 1, since the end surface portion of the rod of the buffer mechanism is merely brought into surface contact with the partition wall, there is a risk of causing uneven wear due to contact with one piece. In addition, the bulkhead made of a plate-like body is likely to bend and deform when it receives a load from the crawler belt tension adjusting device, and determines the welding strength in the front and rear directions where strength is required to receive the load. The welding length is only the thickness. For this reason, in order to increase the structural strength and the welding strength, it is necessary to provide a reinforcing member for the partition wall, which causes problems such as an increase in the number of parts and a decrease in assembly workability.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to simplify the load from the idler wheel by attaching the rear end side of the crawler belt tension adjusting device in a state of being positioned with respect to the side frame. It is an object of the present invention to provide a tracked vehicle that can be reliably received with a simple structure.

  A tracked vehicle according to the present invention includes a track frame having side frames extending in the front and rear directions on both the left and right sides of the center frame, and an idler wheel provided on one side of the front and rear directions of the side frame. A drive wheel provided on the other side of the front and rear directions of the side frame, a crawler belt wound around the idler wheel and the drive wheel, and a side frame disposed in the side frame and disposed on the side frame. A yoke that supports the idler wheel movably in the front and rear directions at a front end that is one side, and a buffer mechanism that is attached to the rear end of the yoke and expands and contracts in the front and rear directions. And a crawler belt tension adjusting device.

  In order to solve the above-described problem, the invention adopts the feature that the invention of claim 1 adopts a bracket at a position facing the rear end portion of the buffer mechanism that constitutes the crawler belt tension adjusting device on the side frame. And the rear end side of the buffer mechanism is attached to the bracket.

  According to a second aspect of the present invention, the bracket includes a pair of brackets attached to the side frame so as to be spaced apart in the left and right directions, and the shock absorbing mechanism of the crawler belt tension adjusting device includes a rod extending from the rear end side of the tube. In addition, a cylindrical body disposed between the pair of brackets is provided on the protruding side of the rod, and the brackets and the cylindrical body are connected using a connecting pin.

  According to a third aspect of the present invention, the side frame has an upper plate positioned on the upper side and extending in the front and rear directions, and an upper roller for supporting the crawler belt from the lower side on the upper plate of the side frame, When the earth and sand discharging port for discharging the earth and sand falling at the position of the upper roller to the lower side is provided, the bracket is attached to the upper plate at a position sandwiching the earth and sand discharging port from the left and right directions. It is in the configuration.

  The invention of claim 4 is that the bracket is provided so as to extend forward and rearward along the side frame.

  According to the first aspect of the present invention, since the bracket is provided on the side frame so as to face the rear end portion of the buffer mechanism of the crawler belt tension adjusting device, the rear end side of the buffer mechanism is positioned using this bracket. Can be installed in condition.

  Therefore, by preventing the displacement between the rear end portion of the buffer mechanism and the bracket, damage such as uneven wear can be prevented. Moreover, since the bracket can be arranged according to the direction of the load from the idler wheel and the crawler belt tension adjusting device, and the weld length can be increased according to the direction of the load, the load can be reliably received. .

  As a result, damage between the buffer mechanism and the bracket can be prevented, and the life and reliability can be improved. In addition, the structural strength and welding strength of the bracket can be increased against the load from the idler and crawler belt tension adjusting device, so the load can be received efficiently with a simple structure without the need for reinforcing members. As a result, assembly workability and the like can be improved.

  According to invention of Claim 2, the cylindrical body provided in the rod extended from the rear-end side of a buffer mechanism is arrange | positioned between a pair of brackets spaced apart in the left and right directions, and was attached to the side frame, and this state Then, a connecting pin is inserted over each bracket and the cylindrical body. Thereby, the protrusion side of the rod of the buffer mechanism can be attached in a positioning state by the pair of brackets and the connecting pin. Further, since the cylindrical body of the buffer mechanism is rotatably connected to each bracket by using a connecting pin, the load caused by the position shift, deformation, etc. of the buffer mechanism that occurs in this rotating direction is released. The load acting on the front and back can be received efficiently.

  According to the invention of claim 3, since the bracket is attached to the upper plate at a position sandwiching the sediment discharge port provided on the upper plate of the side frame from the left and right directions, the bracket discharges the sediment from the crawler belt at the position of the upper roller. The earth and sand falling toward the outlet can be discharged without being caught by the bracket, and sediment accumulation can be prevented.

  According to the invention of claim 4, by providing the bracket so as to extend forward and rearward along the side frame, the load from the crawler belt tension adjusting device can be received in a distributed manner over the entire length of the bracket. And structural strength can be increased. Further, since the bracket can take a long welding length in the rearward direction before receiving the load, the welding strength for the side frame can be increased.

It is a front view which shows the hydraulic excavator provided with the lower traveling body which concerns on embodiment of this invention. It is a front view which expands and shows the lower traveling body in FIG. FIG. 4 is a partially cutaway plan view showing an enlarged view of a track frame and the like in a state where the upper plate of the right side frame is cut at an intermediate position in the upper and lower directions. FIG. 4 is an enlarged cross-sectional view of a main part of one side portion of a side frame, an idler wheel, a crawler belt tension adjusting device, and the like when viewed from the direction of arrows IV-IV in FIG. It is a perspective view of the principal part expansion which shows a side frame, a crawler belt tension adjusting device, a bracket, etc. It is sectional drawing which looked at the side frame, the crawler belt tension adjusting device, the bracket, etc. from the arrow VI-VI direction in FIG. It is sectional drawing of the principal part expansion which looked at the attachment relationship of a bracket, a cylindrical body, and a connection pin from the arrow VII-VII direction in FIG. It is sectional drawing of the principal part expansion which looked at the bracket by the modification of this invention from the same position as FIG.

  Hereinafter, as a tracked vehicle according to an embodiment of the present invention, a hydraulic excavator provided with a tracked lower traveling body will be described as an example and described in detail with reference to FIGS. 1 to 7.

  In FIG. 1, 1 is a hydraulic excavator as a tracked vehicle used for excavation work such as earth and sand. The hydraulic excavator 1 includes a self-propelled track-type (crawler-type) lower traveling body 2, an upper revolving body 3 that is turnably mounted on the lower traveling body 2, and a front side of the upper revolving body 3. And the working device 4 provided in the main body.

  Here, the configuration of the track-type lower traveling body 2 will be described. As shown in FIG. 2, the lower traveling body 2 is generally configured by a track frame 5, idle wheels 9, drive wheels 10, crawler belts 12, crawler belt tension adjusting devices 15, crawler belt tension brackets 27 and 28, connecting pins 29, and the like. Has been.

  Reference numeral 5 denotes a track frame constituting the lower traveling body 2. The track frame 5 is provided on the left and right sides of the center frame 6 on which the upper swing body 3 is mounted, as shown in FIG. The left and right side frames 7 extend in the front and rear directions.

  Further, as shown in FIGS. 4, 6, and 7, the side frame 7 is formed as a rectangular cylinder extending forward and rearward by an upper plate 7A, a lower plate 7B, an inner plate 7C, an outer plate 7D, etc. The upper plate 7A has an inclined surface that is inclined downward toward the outside so that earth and sand do not accumulate. Further, the outer plate 7D of the side frame 7 is formed with a greasing port 7E for connecting a grease gun (not shown) to a greasing valve 25 described later, which is located closer to one side.

  On the other hand, on the upper surface of the upper plate 7A, as shown in FIG. 2, FIG. 3, FIG. . Also, earth and sand discharge ports 7G are formed at positions outside the upper roller mounting bases 7F of the upper plate 7A. Here, the earth and sand discharge port 7G is for discharging the earth and sand through the inside of the side frame 7 when earth and sand adhering to the crawler belt 12 described later contacts the upper roller 13 and falls. Further, crawler belt brackets 27 and 28, which will be described later, are fixed to the lower surface of the upper plate 7A so as to sandwich the soil discharge port 7G from the inside and the outside.

  8 is an idler wheel bracket provided on one end side of the side frame 7. As shown in FIGS. 3, 4, 6 and the like, this idler wheel bracket 8 includes a flange plate 8A fixed to the end portion of the side frame 7 by welding or the like, and projects from the flange plate 8A to the front side to be described later. In order to support 9, the inner support plate 8B and the outer support plate 8C that are opposed to each other on the left and right, and the upper connection plate 8D that integrally connects the upper portions of the support plates 8B and 8C. Further, guides 8E and 8F extending in the front and rear directions are fixed to the inner surfaces of the support plates 8B and 8C, and the guides 8E and 8F are slidable forward and rear in a yoke 16 described later. It is a guide.

  Reference numeral 9 denotes an idler wheel positioned on one side of the side frame 7 in the front-rear direction and rotatably supported in an idler wheel bracket 8 via a yoke 16 described later. A support shaft 9A extending in the left and right directions is provided at the center of the idler wheel 9, and both end sides of the support shaft 9A are rotatably attached to the left and right bearing portions 16C of the yoke 16. As a result, the idler wheel 9 can rotate about the support shaft 9 </ b> A and can move forward and backward along the guides 8 </ b> E and 8 </ b> F of the idler wheel bracket 8 via the yoke 16.

  Reference numeral 10 denotes a driving wheel provided on the other end side of the side frame 7 via a driving wheel bracket 11, and the driving wheel 10 is constituted by a sprocket or the like. The drive wheel 10 is driven to rotate by a traveling hydraulic motor (not shown), thereby causing the crawler belt 12 described below to rotate.

  A crawler belt 12 is wound around and attached between the idler wheel 9 and the drive wheel 10. The crawler belt 12 rotates around the driving wheel 10 to rotate between the driving wheel 10 and the idler wheel 9 so that the excavator 1 can stably travel even on rough terrain.

  Reference numeral 13 denotes, for example, two upper rollers provided between the idler wheel 9 and the drive wheel 10 and provided on the upper plate 7A of the side frame 7. Each upper roller 13 is attached to the upper roller mounting base 7F. The crawler belt 12 is guided forward and backward from the lower side.

  Reference numeral 14 denotes a plurality of, for example, seven lower rollers provided between the idler wheel 9 and the drive wheel 10 and provided on the lower plate 7B of the side frame 7. These lower rollers 14 guide the crawler belt 12 from the upper side to the front and rear directions, and support the weight of the excavator 1.

  Reference numeral 15 denotes a crawler belt tension adjusting device provided inside the side frame 7. The crawler belt tension adjusting device 15 adjusts the tension of the crawler belt 12 between the idle wheel 9 and the drive wheel 10. 4 to 6, the crawler belt tension adjusting device 15 is arranged in a state where a spring force is generated between crawler belt brackets 27 and 28 (described later) provided in the side frame 7 and the idler wheel 9. As shown in FIG. It is installed. The crawler belt tension adjusting device 15 is roughly constituted by a yoke 16 and a buffer mechanism 17 which will be described later.

  Reference numeral 16 denotes a yoke disposed in the side frame 7 and the idler wheel bracket 8. The yoke 16 supports the idler wheel 9 so that the idler wheel 9 can be moved in the front and rear directions at a tip portion on one side of the side frame 7. is there. The yoke 16 has a stepped cylindrical spring receiving portion 16A on the rear end side, and the spring receiving portion 16A is attached to the front end side of a yoke side rod 19 of a buffer mechanism 17 described later. On the other hand, the tip end side of the yoke 16 is an arm portion 16B branched in a substantially U shape in the left and right directions, and a bearing portion 16C is bolted to each arm portion 16B. Each bearing portion 16C is supported so as to be slidable forward and rearward along the guides 8E and 8F of the idler wheel bracket 8 while rotatably supporting the support shaft 9A of the idler wheel 9. .

  A shock absorbing mechanism 17 is attached to the rear end of the yoke 16 in the side frame 7. The buffer mechanism 17 extends and contracts between the idler wheel 9 and crawler belt brackets 27 and 28 described later when an excessive load is applied. As shown in FIG. 6, the buffer mechanism 17 includes a tube 18, a yoke side rod 19, a frame side rod 21, a spring member 22, a grease chamber 23, a greasing valve 25, a cylindrical body 26, and the like, which will be described later. ing.

  Reference numeral 18 denotes a stepped cylindrical tube provided in the side frame 7 so as to extend in the front and rear directions. The inner peripheral side of the tube 18 serves as a rod insertion portion 18A, and the outer peripheral side is positioned on the rear end side. Thus, a bowl-shaped spring receiving portion 18B is formed.

  Reference numeral 19 denotes a yoke-side rod provided on the distal end side (the idle wheel 9 side) of the tube 18. The yoke side rod 19 is slidably fitted into the rod insertion portion 18A of the tube 18 at the rear end side so as to be slidable, and the tip end side is attached to the spring receiving portion 16A of the yoke 16 by a nut 20.

  Reference numeral 21 denotes a frame side rod extending from the rear end side (crawler belt brackets 27, 28 side) of the tube 18, and the frame side rod 21 is slidably inserted into the rod insertion portion 18 </ b> A of the tube 18 at the front end side. . A cylindrical body 26 described later is integrally attached to the projecting side of the frame side rod 21 projecting from the tube 18.

  A spring member 22 is provided between the yoke 16 and the tube 18. The spring member 22 is formed of a coiled compression spring, and is compressed between the spring receiving portion 16A of the yoke 16 and the spring receiving portion 18B of the tube 18. The spring member 22 presses the idler wheel 9 in a direction away from the drive wheel 10 by constantly urging the yoke 16 toward the idler wheel 9.

  Reference numeral 23 denotes a grease chamber formed in the tube 18, and the grease chamber 23 is defined between the yoke side rod 19 and the frame side rod 21. A grease passage 24 extends in the axial direction in the frame side rod 21. One end of the grease passage 24 communicates with the grease chamber 23, and the other end has a circumferential surface on the rear end side of the frame side rod 21. Is open. Further, 25 is a grease supply valve positioned on the rear end side of the frame side rod 21 and screwed to the other end of the grease passage 24. The grease supply valve 25 is formed by a check valve generally called a grease nipple. It is comprised and is arranged toward the greasing port 7E of the side frame 7.

  When grease is supplied to the grease chamber 23, the tip of a grease gun (not shown) inserted into the grease port 7E of the side frame 7 is connected to the grease valve 25 and supplied from the grease gun. Grease is injected into the fat valve 25. Thereby, grease can be supplied to the grease chamber 23 through the grease passage 24. On the other hand, by loosening the greasing valve 25, the grease in the grease chamber 23 can be discharged through the grease passage 24 and the like.

  Reference numeral 26 denotes a cylindrical body attached to a rear end portion which is a protruding side of the frame side rod 21. The cylindrical body 26 is formed by a cylindrical member having left and right directions that are orthogonal to the axis of the frame side rod 21 (the direction of transmission of the load from the idler wheel 9). It is an insertion hole 26A for insertion. The frame-side rod 21 is integrally attached to an intermediate portion in the length direction of the cylindrical body 26 by using fixing means such as press-fitting and welding in the radial direction.

  In addition, the axial dimension (length dimension) of the cylindrical body 26 is slightly smaller than the distance between the crawler belt brackets 27 and 28 described later. Thereby, the cylindrical body 26 can be disposed between the crawler belt brackets 27 and 28 without rattling in the left and right directions.

  27 is an inner crawler belt bracket provided on the lower surface of the upper plate 7A located in the side frame 7, and 28 is an outer crawler belt disposed outside the inner crawler belt bracket 27 and provided on the lower surface of the upper plate 7A. Each of the crawler belt brackets is shown (see FIGS. 4 to 7). Further, the pair of crawler belt brackets 27 and 28 are arranged at positions facing the rear end portion of the buffer mechanism 17 constituting the crawler belt tension adjusting device 15, that is, the rear end portion or the cylindrical body 26 of the frame side rod 21. ing. A cylindrical body 26 is rotatably attached to each of the crawler belt brackets 27 and 28 via a connecting pin 29 described later at a lower portion thereof.

  Further, the construction of each of the crawler belt brackets 27 and 28 will be described in detail. Each of the crawler belt brackets 27 and 28 is formed as an inverted triangular plate material as shown in FIGS. 4 and 5, and as shown in FIG. Pin holes 27A and 28A are formed at the lower position on the top side. In addition, the pair of crawler belt brackets 27 and 28 are located on the inner side in order to arrange the pin holes 27A and 28A substantially horizontally because the upper plate 7A of the side frame 7 is inclined downward toward the outer side. The crawler belt bracket 27 is larger than the crawler belt bracket 28 positioned on the outer side and is formed larger in the downward direction.

  Here, each of the crawler belt brackets 27 and 28 is disposed so as to extend along the front and rear directions of the side frame 7 serving as a transmission direction of the load from the idle wheel 9 and the crawler belt tension adjusting device 15. By arranging in this way, a load acting in the front and rear directions can be received by each of the crawler belt brackets 27 and 28, and deformation and wear can be prevented.

  Further, the crawler belt brackets 27 and 28 arranged extending in the front and rear directions have their upper edge portions 27B and 28B fixed when the upper edge portions 27B and 28B are fixed to the lower surface of the upper plate 7A by welding means. And the upper plate 7A can be welded at a long distance in the front and rear directions. Thereby, since each crawler belt bracket 27,28 can take long welding length, the welding strength with respect to the side frame 7 can be raised.

  Furthermore, the crawler belt brackets 27 and 28 are arranged at positions sandwiching the earth and sand discharge port 7G provided on the upper plate 7A of the side frame 7 from the left and right directions. Thereby, the earth and sand falling from the crawler belt 12 toward the earth and sand outlet 7G at the position of the upper roller 13 can be dropped to the lower side without being caught by the crawler belt tension brackets 27 and 28. Thereby, it is possible to prevent sediment from being deposited on the brackets 27 and 28.

  Reference numeral 29 denotes a connecting pin provided between the cylindrical body 26 and the respective crawler belt brackets 27 and 28. The connecting pin 29 is inserted over the pin holes 27A and 28A and the insertion hole 26A in a state in which the cylindrical body 26 is disposed between the brackets 27 and 28, and a hook portion for retaining and preventing rotation. 29A is bolted to the outer crawler belt bracket 28. Thereby, the connection pin 29 can connect the cylindrical body 26, that is, the frame side rod 21 of the shock-absorbing mechanism 17 to the crawler belt brackets 27 and 28 so as to be rotatable upward and downward.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation of the hydraulic excavator 1 will be described.

  First, when traveling with the hydraulic excavator 1, the crawler belt 12 is rotated around the idler wheel 9 by rotating the drive wheel 10, and the hydraulic excavator 1 is self-propelled to the work site. And when excavation work etc. of earth and sand are performed, the earth and sand can be excavated by moving the working device 4 up and down.

  Here, when the crawler belt 12 is deformed in accordance with the uneven shape of the ground during traveling of the hydraulic excavator 1, the idler wheel 9 is strongly pushed to the rear side. A large load acts on the side.

  However, according to the present embodiment, the upper plate 7A of the side frame 7 is paired with the rear end portion of the frame-side rod 21 that forms the buffer mechanism 17 of the crawler belt tension adjusting device 15 at a position facing the cylindrical body 26. Crawler belt brackets 27, 28 are provided, and a cylindrical body 26 provided at the rear end of the frame side rod 21 is connected to each bracket 27, 28.

  Therefore, the frame-side rod 21 constituting the buffer mechanism 17 can be attached to the respective crawler belt brackets 27 and 28 on the side frame 7 side in a positioning state, and therefore, for example, damage such as uneven wear due to displacement is prevented. Can do. In addition, the brackets 27 and 28 can be arranged so as to extend in the front and rear directions along the side frame 7 in accordance with the direction of the load from the idler wheel 9 and the crawler belt tension adjusting device 15. Can be accepted.

  As a result, the cushioning mechanism 17 can be supported on the crawler belt brackets 27 and 28 of the side frame 7 without damaging them, so that the life and reliability of the lower traveling body 2 can be improved.

  In addition, the structural strength and welding strength of each of the crawler belt brackets 27 and 28 can be increased with respect to the load from the idler wheel 9 and the crawler belt tension adjusting device 15, so that a separate reinforcing member is not required. The load can be received efficiently with a simple structure, and the assembly workability can be improved.

  Further, a cylindrical body 26 provided at the rear end portion of the frame side rod 21 of the shock-absorbing mechanism 17 is disposed between a pair of crawler belt brackets 27 and 28, and extends over the brackets 27 and 28 and the cylindrical body 26. By inserting the connecting pin 29, the rear end portion of the frame side rod 21 of the buffer mechanism 17 can be attached to the side frame 7 side in a positioned state. At this time, the cylindrical body 26 of the buffer mechanism 17 is rotatably connected to the brackets 27 and 28 by using the connection pin 29, so that the position shift of the buffer mechanism 17 due to tolerances, each component It is possible to release upward and downward loads due to misalignment due to elastic deformation, and it is possible to accurately receive only loads acting in the forward and backward directions.

  Further, each of the crawler belt brackets 27 and 28 is attached to the upper plate 7A at a position sandwiching the earth and sand discharge port 7G provided on the upper plate 7A of the side frame 7 from the left and right directions. The earth and sand falling from the crawler belt 12 toward the earth and sand outlet 7G can be discharged without being caught by the brackets 27 and 28. Thereby, accumulation of earth and sand can be prevented, and progress of wear due to accumulated earth and sand can be suppressed.

  In the embodiment, an example in which the inner crawler belt bracket 27 and the outer crawler belt bracket 28 are separately provided and the brackets 27 and 28 are fixed to the upper plate 7A of the side frame 7 as an example. explained. However, the present invention is not limited to this. For example, as in the modification shown in FIG. 8, the inner mounting plate 31 </ b> A and the outer mounting plate 31 </ b> B to which the cylindrical body 26 is mounted are connected by the connecting plate 31 </ b> C. It is also possible to form a crawler belt bracket 31 made of a plate body and to fix the crawler belt bracket 31 to the upper plate 7A of the side frame 7.

  Further, in the embodiment, the case where the two crawler belt brackets 27 and 28 are fixed to the upper plate 7A of the side frame 7 has been described as an example. However, the present invention is not limited to this, and one or three or more brackets may be fixed to the upper plate 7A of the side frame 7. Further, the mounting position of the bracket is not limited to the upper plate 7A of the side frame 7, but may be configured to be attached to the lower plate 7B, the inner plate 7C, the outer plate 7D, or two or more of these.

  Furthermore, in the embodiment, a hydraulic excavator 1 is described as an example of a tracked vehicle. However, the present invention is not limited to this, and can be widely applied to other tracked vehicles such as a hydraulic crane and a bulldozer.

1 Hydraulic excavator (tracked vehicle)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 5 Track frame 6 Center frame 7 Side frame 7A Upper plate 7B Lower plate 7C Inner plate 7D Outer plate 7E Grease port 7F Upper roller mounting base 7G Earth and sand discharge port 8 Idle ring bracket 9 Idle wheel 10 Drive wheel 12 Crawler 13 Upper roller 14 Lower roller 15 Crawler belt tension adjusting device 16 Yoke 17 Buffer mechanism 18 Tube 21 Frame side rod 26 Cylindrical body 27 Inner crawler belt bracket 28 Outer crawler belt bracket 29 Connecting pin 31 Crawler belt bracket 31A Inner mounting plate 31B Outside mounting plate

Claims (4)

A track frame having side frames extending in the front and rear directions on both the left and right sides of the center frame, idle wheels provided on one side of the front and rear directions of the side frame, and front and rear directions of the side frames A drive wheel provided on the other side, a crawler belt wound between the idler wheel and the drive wheel, and the idler at a tip portion disposed on the side frame and on one side of the side frame. A crawler belt tension adjusting device comprising a yoke that supports the wheel movably in the front and rear directions, and a buffer mechanism that is attached to the rear end of the yoke and extends and contracts in the front and rear directions. In a tracked vehicle,
The side frame has a structure in which a bracket is provided at a position facing a rear end portion of the buffer mechanism constituting the crawler belt tension adjusting device, and the rear end side of the buffer mechanism is attached to the bracket. Tracked vehicle. The bracket comprises a pair of brackets attached to the side frame spaced apart in the left and right directions,
The shock absorbing mechanism of the crawler belt tension adjusting device has a rod extending from the rear end side of the tube, and a cylindrical body disposed between the pair of brackets is provided on the protruding side of the rod, and each bracket and the cylindrical shape are provided. The tracked vehicle according to claim 1, wherein the vehicle is connected to the body using a connecting pin. The side frame has an upper plate located on the upper side and extending in the front and rear directions. The upper plate of the side frame falls on the upper roller for supporting the crawler belt from the lower side and at the position of the upper roller. In the case where there is a sediment outlet for discharging sediment to be discharged downward,
The tracked vehicle according to claim 1 or 2, wherein the bracket is configured to be attached to the upper plate at a position sandwiching the earth and sand discharge port from the left and right directions.   4. The tracked vehicle according to claim 1, wherein the bracket is configured to extend in the front and rear directions along the side frame.

Images