JP2013028307A - Guide roller apparatus for crawler vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly rotate an upper roller by restraining the rotation of the upper roller from being hindered by sediment accumulated on a side frame.SOLUTION: The upper roller 14 of a guide roller apparatus 11 includes an inner roller 15 rotatably supported to a supporting shaft 13; an annular elastic member 22 fitted to the outer peripheral surface 15A of the inner roller 15; and an outer roller 23 elastically supported to the outer peripheral side of the inner roller 15 through the annular elastic member 22. Consequently, when a circulating crawler 9 abuts on the outer roller 23, the annular elastic member 22 is elastically deformed to displace the outer roller 23 in a vertical direction. Sediment 27 is thereby pressed by the outer roller 23 to secure a clearance 28 between the outer roller 23 and the sediment 27. Frictional resistance between the outer roller 23 and the sediment 27 is thereby reduced to smoothly rotate the upper roller 14 including the inner roller 15 and the outer roller 23.

Description

  The present invention relates to a guide roller device that is used in a tracked vehicle such as a hydraulic excavator or a hydraulic crane to guide a crawler belt between a drive wheel and an idler wheel.

  In general, a lower traveling body of a tracked vehicle represented by a hydraulic excavator includes a track frame having left and right side frames, drive wheels provided on one end side of each side frame, and the other end side of each side frame. And a crawler belt (crawler) wound around the driving wheel and the idler wheel. As a result, the tracked vehicle can stably travel on rough terrain, muddy ground, and the like.

  On the other hand, left and right side frames of the tracked vehicle are provided with guide roller devices that guide the crawler belt toward the drive wheels and idle wheels. This guide roller device is provided on the lower end side of the side frame, and is provided on the lower side of the side frame and guides the crawler belt on the upper side of the side frame. And an upper guide roller device. The upper guide roller device usually includes a support shaft provided on the upper surface side of the side frame, and an upper roller that is rotatably attached to the support shaft and guides the crawler belt between the drive wheel and the idler wheel. It is configured.

  By the way, when the excavator travels in the muddy ground and the like and the earth and sand adhering to the crawler belt falls on the upper surface of the side frame, the earth and sand accumulates on the upper surface of the side frame and solidifies. For this reason, when the earth and sand deposited on the upper surface of the side frame come into contact with the upper roller that is rotatably provided on the upper surface side of the side frame via the support shaft, smooth rotation of the upper roller is prevented. As a result, the crawler belt (track link) rubs against the outer peripheral surface of the upper roller, which has become difficult to rotate, causing a problem that the upper roller is unevenly worn and its durability is lowered.

  On the other hand, a guide member provided with a guide hole penetrating in the upward and downward directions is fixed to the side frame, and a roller holder that moves upward and downward along the guide hole is provided, and an upper end of the roller holder is provided. There has been proposed a tracked vehicle in which an upper roller is provided on the side and a lower roller is provided on the lower end side.

  According to this prior art, when soil or sand accumulates on the upper surface side of the side frame, the roller holding body is attached to the side frame by jacking up one of the left and right side frames from the ground using the working device. It moves up and down, and the sediment deposited by vibration and impact at this time can be discharged from the side frame (see, for example, Patent Document 1).

JP 2000-104283 A

  However, the above-described tracked vehicle according to the related art has a configuration in which a roller holding body that rotatably holds the upper roller and the lower roller is provided so as to be movable upward and downward with respect to the side frame via the guide member. It is said. For this reason, there is a problem that the configuration becomes complicated and the number of parts increases, leading to an increase in vehicle body weight and an increase in manufacturing cost.

  The present invention has been made in view of the above-described problems of the prior art, and prevents the upper roller from being obstructed by the earth and sand accumulated on the side frame, thereby enabling the upper roller to rotate smoothly at all times. It is an object of the present invention to provide a guide roller device for an electric vehicle.

  In order to solve the above-described problems, the present invention provides a support shaft provided on a side frame that constitutes a traveling body of a tracked vehicle, and a drive wheel that is rotatably attached to the support shaft and provided on the side frame. The present invention is applied to a guide roller device for a tracked vehicle that includes an upper roller that guides a crawler belt between idle wheels.

  The invention according to claim 1 is characterized in that the upper roller includes an inner roller that is rotatably supported by the support shaft via a bearing, an elastic member provided on an outer peripheral side of the inner roller, and the elastic roller. The outer roller is elastically supported on the outer peripheral side of the inner roller through a member, and the outer roller is in contact with the crawler belt.

  According to a second aspect of the present invention, the elastic member is constituted by an annular elastic member fitted to the outer peripheral surface of the inner roller.

  According to a third aspect of the present invention, positioning portions for positioning the elastic member in the axial direction are provided at both axial ends of the inner roller and axial ends of the outer roller.

  According to a fourth aspect of the present invention, the support shaft is configured such that one end side in the axial direction is fixed to the side frame, the other end side in the axial direction is a free end, and the upper roller is attached to the other end side. is there.

  The invention according to claim 5 is that the support shaft is configured such that both end sides in the axial direction are fixed to the side frame and the upper roller is attached to an intermediate portion in the axial direction.

  According to the invention of claim 1, since the outer roller is elastically supported on the outer peripheral side of the inner roller via the elastic member, the elastic member is elastically deformed so that the axial center of the outer roller is the inner side. Displacement with respect to the roller axis. For this reason, when the crawler belt that circulates between the driving wheel and the idler wheel comes into contact with the outer roller, an upward and downward load acts on the outer roller, so that the elastic force is generated between the outer roller and the inner roller. The member is elastically deformed, and the outer roller is displaced upward and downward with respect to the inner roller.

  Therefore, even if the outer roller is covered with earth and sand accumulated on the side frame, the outer roller is displaced upward and downward by the load applied from the crawler track when the tracked vehicle is running, so that the outer roller The earth and sand existing on the outer peripheral side can be pressed upward and downward. For this reason, in a state where the shaft center of the inner roller and the shaft center of the outer roller coincide with each other, a gap can be secured between the outer peripheral surface of the outer roller and the earth and sand. Accordingly, the earth and sand accumulated on the side frame do not contact the outer peripheral surface of the outer roller, and the frictional resistance between the outer roller and the earth and sand can be reduced. Therefore, the upper roller composed of the inner roller and the outer roller. Can be rotated smoothly at all times. As a result, uneven wear of the upper roller can be prevented and durability can be improved, and the upper roller can smoothly guide the crawler belt between the driving wheel and the idler wheel, thereby allowing the tracked vehicle to travel. Stability can be maintained over a long period of time.

  According to the second aspect of the present invention, the annular elastic member is interposed between the inner roller and the outer roller, so that the entire circumference is uniform between the outer peripheral surface of the inner roller and the inner peripheral surface of the outer roller. A gap can be secured. As a result, when the crawler belt comes into contact with the outer roller and the annular elastic member is elastically deformed, the outer roller and the inner roller can be prevented from colliding, and the life of the upper roller composed of the inner roller and the outer roller can be reduced. Can be extended.

  Moreover, the outer roller can be elastically supported on the outer peripheral side of the inner roller only by fitting the outer roller to the outer peripheral side of the inner roller in a state where the annular elastic member is fitted to the outer peripheral surface of the inner roller. Therefore, the configuration of the upper roller including the inner roller and the outer roller can be simplified, and an increase in the number of parts and an increase in manufacturing cost can be suppressed.

  According to invention of Claim 3, an elastic member can be arrange | positioned in the positioning state between the both ends side of the axial direction of an inner side roller, and the both ends of the axial direction of an outer side roller. As a result, the outer roller can be stably supported through the elastic member at both ends in the axial direction of the inner roller, so that the outer roller and the inner roller can collide when the elastic member is elastically deformed. The life of the upper roller composed of the inner roller and the outer roller can be extended.

  According to the invention of claim 4, when using a support shaft fixed to the side frame with one end side in the axial direction being cantilevered, the inner roller is rotated to the other end side of the support shaft that has become a free end. The outer roller can be elastically supported via an elastic member on the outer peripheral side of the inner roller.

  According to the invention of claim 5, when using a support shaft fixed to the side frame in a state where both ends in the axial direction are both-end supported, the inner roller is rotatably supported at the intermediate portion of the support shaft, The outer roller can be elastically supported via an elastic member on the outer peripheral side of the inner roller.

It is a front view which shows the hydraulic shovel provided with the guide roller apparatus which concerns on this invention. It is the A section enlarged view in FIG. 1 which shows the guide roller apparatus by 1st Embodiment. It is sectional drawing which looked at the guide roller apparatus, the side frame, the crawler belt, and the lower roller from the arrow III-III direction in FIG. It is an expanded sectional view which expands and shows the guide roller apparatus in FIG. It is an expanded sectional view of the same position as Drawing 4 showing the state where the outside roller was displaced. It is an expanded sectional view which shows the guide roller apparatus by 2nd Embodiment. It is an expanded sectional view which shows the guide roller apparatus by 3rd Embodiment.

  Hereinafter, embodiments of the guide roller device for a tracked vehicle according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the guide roller device is applied to a hydraulic excavator.

  1 to 5 show a first embodiment of the present invention. In this embodiment, a guide in which an upper roller is attached to the other end side of a support shaft whose one end side in the axial direction is fixed to a side frame. The roller device is illustrated.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a typical example of a tracked vehicle, and the vehicle body of the hydraulic excavator 1 can be swung on a tracked lower traveling body 2 capable of self-propelling and on the lower traveling body 2. And the upper revolving unit 3 mounted on the main body. A work device 4 is attached to the front side of the upper swing body 3 so as to be able to move up and down, and excavation work or the like is performed using the work device 4.

  Reference numeral 5 denotes a track frame constituting the lower traveling body 2, and the track frame 5 has a pair of left and right side frames 6 extending in the front and rear directions (only the left side is shown). Here, as shown in FIG. 3, the side frame 6 includes a left side plate 6A and a right side plate 6B facing in the left and right directions, and a top plate 6C connecting the upper ends of the left and right side plates 6A and 6B. And the lower end side of the side frame 6 is an open end. On the other hand, a left mounting flange 6D extending in the front and rear directions is fixed to the lower end portion of the left side plate 6A, and a right mounting flange 6E extending in the front and rear directions is fixed to the lower end portion of the right side plate 6B. A lower roller 10 to be described later is attached between the left and right mounting flanges 6D and 6E of the side frame 6, and a guide roller device 11 to be described later is attached to the upper surface plate 6C of the side frame 6.

  Reference numeral 7 denotes a drive wheel provided on one end side in the length direction of the side frame 6, and reference numeral 8 denotes an idle wheel provided on the other end side in the length direction of the side frame 6. The drive wheel 7 is rotationally driven by a traveling hydraulic motor and a speed reducer, and circulates a crawler belt 9 described later wound around the idler wheel 8.

  Reference numeral 9 denotes a crawler belt (crawler) wound around the drive wheel 7 and the idle wheel 8. As shown in FIGS. 2 and 3, the crawler belt 9 includes a plurality of track links 9A, a connection pin 9B for connecting the track links 9A in an endless manner, and a plate attached to the outer peripheral side of each track link 9A. The track shoe 9 </ b> C has a shape. The crawler belt 9 is driven by the drive wheels 7 so as to circulate between the drive wheels 7 and the idler wheels 8 while being guided by the lower rollers 10 and the upper rollers 14 described later. It is intended to run.

  Reference numeral 10 denotes a plurality of lower rollers provided on the lower end side of the side frame 6. Each of the lower rollers 10 is rotatably provided between the left and right mounting flanges 6D and 6E of the side frame 6, and is disposed at an appropriate interval in the length direction (front and rear directions) of the side frame 6. . Each lower roller 10 abuts on the track link 9 </ b> A of the crawler belt 9 that moves around to guide the crawler belt 9 toward the drive wheel 7 and the idler wheel 8.

  Next, the guide roller device according to the present embodiment provided on the upper end side of the side frame 6 will be described.

  Reference numeral 11 denotes a plurality of (for example, three) guide roller devices provided on the upper end side of the side frame 6. Each of these guide roller devices 11 supports the crawler belt 9 from the lower side to guide the crawler belt 9 toward the drive wheel 7 and the idler wheel 8. Here, the guide roller device 11 includes a mounting bracket 12, a support shaft 13, an upper roller 14, and the like which will be described later.

  Reference numeral 12 denotes a mounting bracket provided on the upper surface plate 6C of the side frame 6. The mounting bracket 12 is for mounting a support shaft 13 to be described later. Here, the mounting bracket 12 has a leg portion 12A fixed to the upper surface plate 6C of the side frame 6 by means of welding or the like, and is integrally provided on the leg portion 12A and extends leftward and rightward from the upper surface plate 6C. It is comprised by the protruding cylindrical part 12B. Further, the inner peripheral side of the cylindrical portion 12B is a shaft insertion hole 12C into which the support shaft 13 is inserted.

  Reference numeral 13 denotes a support shaft fixed to the upper surface plate 6 </ b> C of the side frame 6 via the mounting bracket 12, and the support shaft 13 rotatably supports an upper roller 14 described later with respect to the side frame 6. Here, the support shaft 13 has one end side (base end side) 13A in the axial direction inserted into the shaft insertion hole 12C of the mounting bracket 12 in a press-fitted state, and the other end side 13B (front end side) in the axial direction. Is a free end and protrudes left and right from the cylindrical portion 12B of the mounting bracket 12. The support shaft 13 is fixed to the side frame 6 with one end side 13A being cantilevered by the mounting bracket 12, and an upper roller 14 to be described later is attached to the other end side 13B which is a free end. .

  Next, reference numeral 14 denotes an upper roller rotatably attached to the other end side 13B of the support shaft 13. The upper roller 14 lowers the crawler belt 9 that circulates when the track link 9A of the crawler belt 9 abuts on the lower side. It is what is supported from. Here, the upper roller 14 is configured as a roller having a double structure by an inner roller 15, which will be described later, an annular elastic member 22, and an outer roller 23.

  Reference numeral 15 denotes an inner roller constituting the inner side of the upper roller 14 having a double structure, and the inner roller 15 is rotatably supported by a support shaft 13 via a bush 18 described later. Here, the inner roller 15 is formed in a stepped cylindrical shape as a whole, and is extended annularly from the outer peripheral surface 15A to the one end side (the mounting bracket 12 side) in the axial direction of the inner roller 15. A flange portion 15B is provided. Further, the end surface on the other end side in the axial direction of the inner roller 15 is a lid body attachment surface 15C to which a lid body 16 described later is attached.

  On the other hand, a bush insertion hole 15D into which a later-described bush 18 is inserted is provided on the inner peripheral side located at the axial center of the inner roller 15, and both axial ends of the bush insertion hole 15D are provided. Are provided with inner peripheral end faces 15E and 15F. A small-diameter oil passage 15G extending in the axial direction is formed on the inner peripheral side of the inner roller 15, and both end sides of the oil passage 15G are open to inner peripheral end surfaces 15E and 15F.

  A seal mounting hole 15H having a larger diameter than the bush insertion hole 15D and a seal mounting hole 15H larger than the bush insertion hole 15D are provided on the inner peripheral side of the inner roller 15 on one axial end side (the mounting bracket 12 side). A bracket housing hole 15J having a hole diameter is formed concentrically with the bush insertion hole 15D. A floating seal 21 described later is provided in the seal mounting hole 15H, and the cylindrical portion 12B of the mounting bracket 12 is accommodated in the bracket accommodation hole 15J. Further, a cover fitting hole 15K having a larger diameter than the bush insertion hole 15D is provided on the inner peripheral side of the inner roller 15 located on the other end side in the axial direction (the cover attachment surface 15C side). It is formed concentrically with the insertion hole 15D. The lid fitting hole 15K is for fitting a lid 16 described later in a state in which a thrust plate 19 described later is accommodated.

  Reference numeral 16 denotes a lid attached to the other end side of the inner roller 15 in the axial direction. The lid 16 constitutes a part of the inner roller 15. Here, the lid body 16 is a bottomed cylindrical body that fits into the lid body fitting hole 15K of the inner roller 15, and an annular flange having an outer diameter dimension substantially equal to that of the inner roller 15 is provided on the outer peripheral side thereof. A portion 16A is provided. The lid body 16 is fitted into the lid body fitting hole 15K of the inner roller 15 by a plurality of bolts 16B (only one is shown) arranged at equal intervals in the circumferential direction of the flange portion 16A. The inner roller 15 is fixed to the lid attachment surface 15C. Thereby, the other end side of the inner roller 15 is closed by the lid body 16, and the lubricating oil L is sealed in the inner roller 15 by the lid body 16 and a floating seal 21 described later.

  Reference numeral 17 denotes a retaining plate attached to the cover body mounting surface 15C of the inner roller 15 with the flange portion 16A of the lid body 16 interposed therebetween. The retaining plate 17 attaches an annular elastic member 22 described later to the inner roller 15. To prevent axial removal. The retaining plate 17 is made of an annular plate having an outer diameter equal to that of the flange portion 15B of the inner roller 15.

  The retaining plate 17 is fixed to the lid mounting surface 15C together with the flange portion 16A of the lid 16 using a plurality of bolts 17A (only one is shown) arranged at equal intervals in the circumferential direction. It becomes the composition which is done. In this case, in the retaining plate 17, a housing hole 17 </ b> B for housing the head of each bolt 16 </ b> B is formed in a portion corresponding to each bolt 16 </ b> B that fixes the lid 16 to the inner roller 15. Thus, only the retaining plate 17 can be removed by removing each bolt 17A while the lid 16 is fixed to the inner roller 15 by each bolt 16B.

  Reference numeral 18 denotes a bush as a bearing inserted into the bush insertion hole 15 </ b> D of the inner roller 15. The bush 18 rotatably supports the inner roller 15 with respect to the support shaft 13. Here, the outer peripheral side of the bush 18 is press-fitted into the bush insertion hole 15D, and the support shaft 13 is slidably inserted into the inner peripheral side of the bush 18. Further, a large-diameter flange 18A is provided on the other end side of the bush 18 in the axial direction, and the flange 18A is configured to be in sliding contact with a thrust plate 19 described later.

  Reference numeral 19 denotes a thrust plate attached to the other end side 13B of the support shaft 13, and the thrust plate 19 is formed in a disk shape having an outer diameter substantially equal to the flange portion 18A of the bush 18, and It is fixed to the end surface of the end side 13B using a bolt 19A. The thrust plate 19 is in contact with the flange portion 18 </ b> A of the bush 18 and is in contact with the distal end portion of the lid body 16. Accordingly, the thrust plate 19 is configured to receive a thrust load acting on the inner roller 15 and prevent the inner roller 15 from being pulled out in the axial direction with respect to the support shaft 13.

  Reference numeral 20 denotes an oil reservoir chamber provided between the lid body 16 and the thrust plate 19 and provided on the inner peripheral side of the inner roller 15, and the oil reservoir chamber 20 stores lubricating oil L therein. The lubricating oil L stored in the oil sump chamber 20 is supported through a radial oil passage (not shown) formed in the lid body 16 and an axial oil passage 15G formed in the inner roller 15. The sliding surface between the shaft 13 and the bush 18, the sliding surface between the flange 18 </ b> A of the bush 18 and the thrust plate 19, and the like are configured to lubricate these sliding surfaces.

  Reference numeral 21 denotes a floating seal provided between the cylindrical portion 12 </ b> B of the mounting bracket 12 and the inner roller 15. The floating seal 21 closes the gap between the cylindrical portion 12B and the roller 15, seals the lubricating oil L stored in the oil sump chamber 20 in the inner roller 15, and prevents foreign matters such as muddy water and earth and sand. Intrusion into the inner roller 15 is suppressed.

  Reference numeral 22 denotes two annular elastic members respectively provided on both end sides of the inner roller 15 in the axial direction. Each of the annular elastic members 22 is formed as an annular body having a circular cross section using, for example, an elastic material such as rubber, and is fitted to the outer peripheral surface 15 </ b> A of the inner roller 15. Here, the inner diameter dimension of the annular elastic member 22 is set slightly smaller than the outer diameter dimension of the inner roller 15, and the outer diameter dimension of the annular elastic member 22 is outside the flange portion 15 </ b> B of the inner roller 15 and the retaining plate 17. It is set larger than the diameter dimension.

  Thereby, the inner peripheral side of the annular elastic member 22 is fitted to the outer peripheral surface 15A of the inner roller 15 with a tightening margin, and the outer peripheral side of the annular elastic member 22 is connected to the flange portion 15B of the inner roller 15 and the retaining plate 17. Projects radially outward from the outer peripheral surface. Each annular elastic member 22 elastically supports an outer roller 23 described later with respect to the inner roller 15.

  Next, reference numeral 23 denotes an outer roller attached to the outer peripheral side of the inner roller 15 via each annular elastic member 22, and this outer roller 23 is elastically supported to the inner roller 15 by each annular elastic member 22. Has been. Here, on the outer peripheral side of the outer roller 23, there is a pair of large-diameter outer peripheral surfaces 23A located in the center portion in the axial direction and a pair of outer diameter dimensions located on both end sides in the axial direction and smaller than the large-diameter outer peripheral surface 23A. A track contact surface 23B is provided, and each track link 9A of the track 9 is in contact with the track contact surface 23B.

  On the other hand, on the inner peripheral side of the outer roller 23, there is a small-diameter inner peripheral surface 23C positioned at the axial center, and a large-diameter inner surface positioned at both axial ends and having a larger inner diameter than the small-diameter inner peripheral surface 23C. The peripheral surface 23D is provided integrally. Further, on the inner peripheral side of the outer roller 23, inner peripheral side end surfaces 23E and 23F are formed at the boundary portion between each small diameter inner peripheral surface 23C and the large diameter inner peripheral surface 23D, and one inner peripheral side end surface is formed. 23E faces the flange portion 15B of the inner roller 15 with a gap in the axial direction, and the other inner peripheral side end face 23F faces the retaining plate 17 with a gap in the axial direction.

  In this case, as shown in FIG. 4, when the axial center AA of the inner roller 15 and the axial center BB of the outer roller 23 coincide with each other, the small-diameter inner peripheral surface 23C of the outer roller 23 is It faces the outer peripheral surface 15A of the inner roller 15 with a gap 24 in the radial direction. Further, the large-diameter inner peripheral surface 23 </ b> D of the outer roller 23 is configured to face the outer peripheral surface of the flange portion 15 </ b> B of the inner roller 15 and the outer peripheral surface of the retaining plate 17 with a radial gap 24. Therefore, when the crawler belt 9 comes into contact with the crawler belt contact surface 23B of the outer roller 23 and the annular elastic member 22 is elastically deformed, as shown in FIG. 5, the axial center B-B of the outer roller 23 is the inner roller. 15 is displaced (eccentric) with respect to the axial center AA, and the outer roller 23 is configured to be displaced upward and downward with respect to the inner roller 15 within a gap 24.

  Reference numerals 25 and 26 denote positioning portions provided on both ends in the axial direction of the inner roller 15 and on both ends in the axial direction of the outer roller 23. The positioning portions 25 and 26 are formed between the inner roller 15 and the outer roller 23, respectively. The annular elastic member 22 disposed therebetween is positioned in the axial direction. Here, the one positioning portion 25 is a space formed between the inner peripheral side end face 23E of the outer roller 23 and the flange portion 15B of the inner roller 15, and an annular elastic member disposed in the positioning portion 25. 24 is positioned in the axial direction by being sandwiched between the inner peripheral side end surface 23E of the outer roller 23 and the flange portion 15B of the inner roller 15.

  The other positioning portion 26 is a space formed between the inner peripheral side end face 23 </ b> F of the outer roller 23 and the retaining plate 17 attached to the inner roller 15. The annular positioning portion 26 is arranged in the positioning portion 26. The elastic member 24 is positioned in the axial direction by being sandwiched between the inner peripheral side end face 23 </ b> F of the outer roller 23 and the retaining plate 17.

  The guide roller device 11 according to the present embodiment has the above-described configuration, and the hydraulic excavator 1 including the guide roller device 11 rotates the crawler belt 9 between the drive wheel 7 and the idler wheel 8. Can travel stably on rough terrain and muddy ground. Then, the upper roller 14 of the guide roller device 11 drives the crawler belt 9 by supporting the crawler belt 9 from below while rotating about the support shaft 13 fixed to the side frame 6 via the mounting bracket 12. Guide toward the wheel 7 and the idler wheel 8.

  By the way, when the excavator 1 travels, the earth and sand 27 adhering to the crawler belt 9 drops and accumulates on the upper surface plate 6C of the side frame 6, thereby constituting the guide roller device 11 as shown in FIGS. The periphery of the upper roller 14 is covered with accumulated sediment 27.

  In contrast, the upper roller 14 of the guide roller device 11 according to the present embodiment is fitted to the inner roller 15 rotatably supported by the support shaft 13 via the bush 18 and the outer peripheral surface 15A of the inner roller 15. The two annular elastic members 22 and the outer roller 23 elastically supported on the outer peripheral side of the inner roller 15 through the respective annular elastic members 22 are configured.

  For this reason, when the track link 9A of the crawler belt 9 that makes a circling motion comes into contact with the crawler belt contact surface 23B of the outer roller 23, an upward and downward load acts on the outer roller 23, The annular elastic member 22 is elastically deformed between the inner roller 15. Thereby, as shown in FIG. 5, the axial center BB of the outer roller 23 is displaced upward and downward with respect to the axial center AA of the inner roller 15.

  Since the outer roller 23 is displaced upward and downward with respect to the inner roller 15 in this way, the earth and sand 27 existing on the outer peripheral side of the outer roller 23 is pressed upward and downward. Is restored and the axial center B-B of the outer roller 23 coincides with the axial center A-A of the inner roller 15, as shown in FIGS. A gap 28 can be formed in the gap.

  Therefore, the inner and outer rollers 15 and 25 are prevented from coming into contact with the outer peripheral surface of the outer roller 23 and the frictional resistance between the outer roller 23 and the earth and sand 27 is reduced. And the outer roller 23 can be rotated smoothly at all times. As a result, uneven wear of the upper roller 14 can be prevented and its durability can be enhanced. By smoothly guiding the crawler belt 9 between the drive wheel 7 and the idler wheel 8 by the upper roller 14, the hydraulic excavator It is possible to maintain the stability during traveling of 1 over a long period of time.

  In this case, in the guide roller device 11 according to the present embodiment, the two annular elastic members 22 are interposed between the inner roller 15 and the outer roller 23, so that the outer peripheral surface 15A of the inner roller 15 and the outer roller 23 are A uniform gap 24 can be ensured between the inner peripheral surface and the entire circumference. As a result, when the crawler belt 9 comes into contact with the outer roller 23 and each annular elastic member 22 is elastically deformed, the outer roller 23 can be prevented from colliding with the inner roller 15, and the inner roller 15, the outer roller 23, The life of the upper roller 14 made of can be extended.

  In addition, in a state where each annular elastic member 22 is fitted to the outer peripheral surface 15 </ b> A of the inner roller 15, the outer roller 23 is fitted to the outer peripheral side of the inner roller 15 by simply fitting the outer roller 23 to the outer peripheral side of the inner roller 15. Can be formed easily. Therefore, the overall configuration of the guide roller device 11 including the upper roller 14 can be simplified, and an increase in the number of parts related to the guide roller device 11 and an increase in manufacturing cost can be suppressed.

  Further, in the guide roller device 11 according to the present embodiment, the positioning portions 25 and 26 are provided at both axial ends of the inner roller 15 and the outer roller 23, so that both axial sides of the inner roller 15 and the outer roller 23 are axial. In addition, the annular elastic member 22 can be disposed in a positioned state. As a result, the outer roller 23 can be stably supported via the annular elastic member 22 at both ends in the axial direction of the inner roller 15, so that the outer roller 23 is inward when the annular elastic member 22 is elastically deformed. The collision with the roller 15 can be reliably prevented, and the life of the upper roller 14 composed of the inner roller 15 and the outer roller 23 can be extended.

  Next, FIG. 6 shows a second embodiment of the present invention. The feature of this embodiment is that both end portions of the outer roller in the axial direction are projected from both end portions of the inner roller in the axial direction. That is. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 31 denotes a guide roller device according to this embodiment. The guide roller device 31 is substantially the same as the guide roller device 11 according to the first embodiment, and the support shaft 13 is fixed to the upper surface plate 6C of the side frame 6 via the mounting bracket 12, and rotates to the support shaft 13. The upper roller 32 includes an inner roller 15, an annular elastic member 22, and an outer roller 33 to be described later. However, the guide roller device 31 according to the present embodiment is different from the outer roller 23 according to the first embodiment in the configuration of the outer roller 33.

  Reference numeral 33 denotes an outer roller according to the present embodiment which is elastically supported on the outer peripheral side of the inner roller 15 via an annular elastic member 22. Here, on the outer peripheral side of the outer roller 33, there is a pair of large-diameter outer peripheral surfaces 33A located in the center portion in the axial direction and a pair of outer diameter dimensions located on both end sides in the axial direction and smaller than the large-diameter outer peripheral surface 33A. The crawler belt contact surface 33B is integrally provided, and the track links 9A of the crawler belt 9 are in contact with the crawler belt contact surface 33B.

  On the other hand, on the inner peripheral side of the outer roller 33, there is a small-diameter inner peripheral surface 33C located at the center in the axial direction and a large-diameter inner surface located on both ends in the axial direction and having a larger inner diameter than the small-diameter inner peripheral surface 33C. The peripheral surface 33D is provided integrally. Further, on the inner peripheral side of the outer roller 33, inner peripheral side end surfaces 33E and 33F are formed at the boundary between each small diameter inner peripheral surface 33C and the large diameter inner peripheral surface 33D, and one inner peripheral side end surface is formed. 33E faces the flange portion 15B of the inner roller 15 with a gap in the axial direction, and the other inner peripheral side end face 33F faces the retaining plate 17 with a gap in the axial direction.

  Here, the end surface 33G on one end side of the outer roller 33 protrudes from the end surface 15L on one end side of the inner roller 15 in the axial direction by a dimension L1. On the other hand, the end surface 33H on the other end side of the outer roller 33 protrudes in the axial direction by a dimension L2 from the end surface 17B of the retaining plate 17 attached to the other end side of the inner roller 15.

  The guide roller device 31 according to the present embodiment has the above-described configuration, and the basic operation is not different from the guide roller device 11 according to the first embodiment described above.

  However, according to the present embodiment, the end surface 33G on the one end side of the outer roller 33 is protruded in the axial direction from the end surface 15L on the one end side of the inner roller 15 by the dimension L1, and the end surface 33H on the other end side of the outer roller 33 is formed. Is protruded in the axial direction by a dimension L2 from an end surface 17B of the retaining plate 17 attached to the other end side of the inner roller 15.

  Thereby, it is possible to prevent the earth and sand 27 from entering the gap 24 between the one end side of the inner roller 15 and the one end side of the outer roller 33 by the end surface 33G on one end side of the outer roller 33. On the other hand, the end surface 33H on the other end side of the outer roller 33 prevents the earth and sand 27 from entering the gap 24 between the other end side of the inner roller 15 and the other end side of the outer roller 33, and the retaining plate 17 The head of the bolt 17A that attaches to the inner roller 15 can be covered from the outer peripheral side, and the head of the bolt 17A can be protected from flying stones and the like during travel. As a result, the durability of the upper roller 32 composed of the inner roller 15 and the outer roller 33 can be increased, and the life of the guide roller device 31 can be extended.

  Next, FIG. 7 shows a third embodiment of the present invention. The feature of this embodiment is that the upper roller is supported by an intermediate portion of a support shaft whose both ends in the axial direction are fixed to the side frame. It is to have done. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 41 denotes a guide roller device according to this embodiment. The guide roller device 41 includes a mounting bracket 42, a support shaft 43, and an upper roller 44, which will be described later, in substantially the same manner as the guide roller device 11 according to the first embodiment. However, the guide roller device 41 is different from the guide roller device 11 according to the first embodiment in that both end sides of the support shaft 43 in the axial direction are fixed to the side frame 6.

  Reference numeral 42 denotes a pair of mounting brackets provided on the side frame 6. The mounting brackets 42 are fixed to the side frame 6 by means of welding or the like, and a leg portion 42A and an upper end portion of the leg portion 42A. It is comprised with the bearing part 42C fixed using the volt | bolt 42B. Further, seal mounting holes 42D for mounting a floating seal 47 described later are provided on the end surfaces of the bearing portion 42C facing each other.

  Reference numeral 43 denotes a support shaft fixed to the upper surface plate 6 </ b> C of the side frame 6 via the mounting bracket 42. The support shaft 43 is inserted into the bearing portions 42 </ b> C of the mounting brackets 42 at both ends in the axial direction so as to be rotated, and supports an upper roller 44 described later at an intermediate portion in the axial direction. Thus, the support shaft 43 is fixed to the side frame 6 in a state where the support shaft 43 is supported at both ends by the mounting brackets 42.

  Reference numeral 44 denotes an upper roller rotatably attached to an intermediate portion in the axial direction of the support shaft 43. The upper roller 44 has a double structure by an inner roller 45, an annular elastic member 48, and an outer roller 49 which will be described later. It is configured as a roller.

  Reference numeral 45 denotes an inner roller constituting the inner side of the upper roller 44. The inner roller 45 is formed in a stepped cylindrical shape as a whole, and a bush insertion hole 45A into which a later-described bush 46 is inserted is provided on the inner peripheral side thereof. It has become. On both end faces in the axial direction of the inner roller 45, seal mounting holes 45B for mounting a floating seal 47 described later are provided. In addition, an oil reservoir chamber 45 </ b> C for storing the lubricating oil L is provided on the inner peripheral side of the inner roller 45 and is located in the intermediate portion in the axial direction. On the other hand, on the outer peripheral side of the inner roller 45, there are provided a small-diameter outer peripheral surface 45D positioned on both axial ends, and a pair of annular flanges 45E projecting radially from the respective small-diameter outer peripheral surfaces 45D.

  Reference numeral 46 denotes two bushes serving as bearings inserted into the bush insertion holes 45 </ b> A of the inner roller 45. The bushes 46 support the inner roller 45 rotatably with respect to the support shaft 43. Here, each bush 46 is press-fitted into the bush insertion hole 45 </ b> A from both ends of the inner roller 45, and a support shaft 43 is slidably inserted into the inner peripheral side of each bush 46.

  As a result, the inner roller 45 is rotatably supported by the support shaft 43 via each bush 46, and the sliding surface between the inner peripheral surface of each bush 46 and the support shaft 43 is stored in the oil sump chamber 45C. The lubricating oil L is lubricated. Further, a floating seal 47 is provided between the seal mounting hole 42D provided in the bearing portion 42C of each mounting bracket 42 and the seal mounting hole 45B provided in both end faces of the inner roller 45, respectively. Lubricating oil L is held in the inner roller 45 by the floating seal 47.

  Reference numeral 48 denotes two annular elastic members respectively provided on both ends in the axial direction of the inner roller 45. Each annular elastic member 48 is an annular body having a circular cross section using an elastic material such as rubber. It is formed and is fitted to the small-diameter outer peripheral surface 45D of the inner roller 45 with a tightening margin. Further, the annular elastic member 48 is restricted from moving in the axial direction by the annular flange 45E of the inner roller 45, and the outer peripheral side of the annular elastic member 48 projects outward in the radial direction from the outer peripheral surface of the annular flange 45E. Yes.

  Reference numeral 49 denotes an outer roller elastically supported on the outer peripheral side of the inner roller 45 via each annular elastic member 48. Here, the inner peripheral surface 49A of the outer roller 49 has an inner diameter larger than the outer diameter of the annular flange 45E provided on the inner roller 45, and the outer peripheral side of the inner roller 45 via the annular elastic member 48. When the outer roller 49 is disposed, a radial gap 50 is formed between the outer peripheral surface of the annular flange 45E and the inner peripheral surface 49A of the outer roller 49. Further, on both end sides in the axial direction on the inner peripheral side of the outer roller 49, annular retaining plate mounting surfaces 49B are provided so as to surround the inner peripheral surface 49A.

  On the other hand, on the outer peripheral side of the outer roller 49, there are a crawler belt contact surface 49C positioned at both axial ends, and a small-diameter outer peripheral surface positioned at an intermediate portion in the axial direction and having a smaller outer diameter than the crawler belt contact surface 49C. 49D and a crawler belt contact surface 49C is in contact with a crawler belt (not shown). Further, on both end sides in the axial direction on the outer peripheral side of the outer roller 49, annular projecting portions 49E projecting toward the outer side in the axial direction (the mounting bracket 12 side) are provided, and bolts described later are provided by the projecting portions 49E. The head of 51A is configured to be covered from the outer peripheral side.

  Reference numeral 51 denotes a retaining plate attached to each retaining plate mounting surface 49B of the outer roller 49. The retaining plate 51 is an annular plate having an inner diameter smaller than the inner peripheral surface 49A of the outer roller 49. It has become. Each of these retaining plates 51 is fixed to the retaining plate mounting surface 49B using a plurality of bolts 51A, and faces the annular flange 45E of the inner roller 45 with an interval in the axial direction.

  Reference numeral 52 denotes a positioning portion provided at both axial ends of the inner roller 45 and both axial ends of the outer roller 49, and each positioning portion 52 is disposed between the inner roller 45 and the outer roller 49. The annular elastic member 48 is positioned in the axial direction. Here, each positioning portion 52 is formed of a space formed between each annular flange 45E of the inner roller 45 and the retaining plate 51, and the annular elastic member 48 disposed in the positioning portion 52 is annular. It is positioned in the axial direction by being sandwiched between the flange 45E and the retaining plate 51.

  The guide roller device 41 according to the present embodiment has the above-described configuration, and both end sides of the support shaft 43 are fixed to the side frame 6 by using the mounting bracket 42, and the upper roller 44 rotates at the intermediate portion of the support shaft 43. Also in the guide roller device 41 supported so as to be able to obtain the same operational effects as those of the guide roller device 11 according to the first embodiment described above.

  In the first embodiment described above, the annular elastic member 22 is used as the elastic body provided on the outer peripheral side of the inner roller 15, and the annular elastic member 22 is fitted to the outer peripheral surface 15A of the inner roller 15 with a margin. The case is shown as an example. However, the present invention is not limited to this. For example, a plurality of block-shaped elastic bodies are formed using an elastic material such as rubber, and the plurality of elastic bodies are arranged at equal intervals on the outer peripheral surface 15A of the inner roller 15. It is good also as a structure to adhere. The same applies to the annular elastic member 48 according to the second embodiment.

  Further, in the first embodiment described above, a large-diameter flange portion 15B is integrally provided on one end side in the axial direction of the inner roller 15, and the annular elastic member 22 is prevented from being removed in the axial direction by the flange portion 15B. The case is illustrated. However, the present invention is not limited to this. For example, an annular retaining plate may be attached to the end face on one end side of the inner roller 15.

  Further, in each of the above-described embodiments, the hydraulic excavator is exemplified as the 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. it can.

1 Hydraulic excavator (tracked vehicle)
2 Lower traveling body (running body)
6 Side frame 7 Drive wheel 8 idler wheel 9 crawler belt 11, 31, 41 guide roller device 13, 43 support shaft 13A one end side 13B other end side 14, 32, 44 upper roller 15, 45 inner roller 15A outer peripheral surface 18, 46 bush (bearing)
22, 48 Annular elastic member (elastic member)
23, 33, 49 Outer roller 49D Small diameter outer peripheral surface (outer peripheral surface)
25, 26, 52 Positioning part

Claims (5)

The crawler belt is guided between a support shaft provided on a side frame constituting a traveling body of the tracked vehicle, and a drive wheel and an idler wheel which are rotatably attached to the support shaft and provided on the side frame. In a guide roller device for a tracked vehicle comprising a roller,
The upper roller includes an inner roller rotatably supported by the support shaft via a bearing, an elastic member provided on an outer peripheral side of the inner roller, and an outer peripheral side of the inner roller via the elastic member. A guide roller device for a tracked vehicle characterized by comprising an outer roller that is elastically supported and against which the crawler belt abuts.   The guide roller device for a track type vehicle according to claim 1, wherein the elastic member is configured by an annular elastic member fitted on an outer peripheral surface of the inner roller.   The tracked vehicle according to claim 1 or 2, wherein positioning portions for positioning the elastic member in the axial direction are provided at both axial ends of the inner roller and axial ends of the outer roller. Guide roller device.   4. The support shaft according to claim 1, 2, or 3, wherein one end side in the axial direction is fixed to the side frame, and the other end side in the axial direction is a free end, and the upper roller is attached to the other end side. A guide roller device for a tracked vehicle.   4. The guide roller device for a tracked vehicle according to claim 1, wherein the support shaft is configured such that both end sides in the axial direction are fixed to the side frame and the upper roller is attached to an intermediate portion in the axial direction.

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