JP2010221978A - Idler wheel supporting structure of crawler type vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an idler wheel supporting structure of a crawler type vehicle capable of suppressing damages and deformation of a fitting bracket by simplifying the shape of an outer part of the fitting bracket. <P>SOLUTION: In the idler wheel supporting structure of a crawler type vehicle, driving wheels 11 are provided on one end of side frames 10 arranged on the right and left sides of a truck frame, end plates 14 are provided on the other end of respective side frames 10, respectively, a pair of right and left fitting brackets 33 extend from the respective end plates 14, a yoke 44 for supporting idler wheel 12 via a bearing part 43 is provided between the fitting brackets 33, a crawler 13 is wound around the driving wheels 11 and the idler wheel 12, and crawler tension adjusting means 51 for longitudinally moving the yoke 44 and the idler wheel 12 are provided at the root of the yoke 44 so as to penetrate through the respective end plates 14. In the structure, supporting member 45A for transmitting the loads f1, f2 in the vertical direction and the right-to-left direction to the fitting brackets 33 are also provided on parts closer to the respective end plates 14 than to the respective bearing parts 43 of the yoke 44. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an idler wheel support structure for a crawler type vehicle that is provided in a crawler type vehicle such as a hydraulic excavator and supports idler wheels included in a traveling body thereof.

  14 is a side view of a hydraulic excavator cited as an example of a crawler type vehicle, FIG. 15 is a cross-sectional view showing a conventional idler wheel support structure, and FIG. 16 is a side view of the conventional idler wheel support structure shown in FIG. FIG. 17 is a front view of the conventional idler wheel support structure shown in FIG.

  A crawler type vehicle such as a hydraulic excavator shown in FIG. 14 has a traveling body 1 and a revolving body 2, and the revolving body 2 is provided with a front working mechanism 3, a cab 21, a machine room 22, and the like. The front working mechanism 3 includes a boom 23 connected to the revolving body 2 so as to be rotatable in the vertical direction, an arm 24 connected to the boom 23 so as to be rotatable in the vertical direction, and a front attachment provided at the tip of the arm 24. For example, the bucket 25 is included. The revolving unit 2 is connected to the traveling unit 1 through a revolving wheel 20 so as to be able to turn. The traveling body 1 includes left and right traveling units 1R, 1L (only one is shown), and these traveling units 1R, 1L include driving wheels 11 supported on a pair of side frames 10 constituting a track frame. The idler wheel 12 is provided, and a crawler belt 13 is wound between the drive wheel 11 and the idler wheel 12.

  As is apparent from FIGS. 15 and 16, the mounting portion of the idler wheel 12 is bonded and fixed to the end plate 14 provided at the end of the side frame 10 by welding means, and a pair of left and right facing the axial direction of the side frame 10. Mounting brackets 33, 33 made of are extended.

  As shown in FIG. 17, the pair of mounting brackets 33 have a main body plate 33a whose upper and lower portions are bent outward at a predetermined angle, and are formed in an L shape inside the main body plate 33a. The sandwiched plate bodies 33b and 33c are abutted in a state having parallel horizontal surfaces directed in the axial direction of the side frame 10, and are joined and fixed by welding means along the joining line. As a result, the bearing portion 35 that supports the shaft 34 that extends to the left and right of the idler wheel 12 is supported between the sandwiching plate bodies 33b and 33c. The main body plate 33a and the sandwiching plate bodies 33b and 33c form a box structure portion that opens on the front end side, and these box structure portions protrude in the axial direction of the side frame 10. Further, only the main body plate 33a exists between the upper and lower box structure portions.

  The idler wheel 12 is movable in the front-rear direction between the sandwiching plate bodies 33b and 33c, whereby the tension of the crawler belt 13 can be adjusted. In order to adjust the tension of the crawler belt 13, the crawler belt tension adjusting means 51 shown in FIG. 15 is provided. That is, the shaft 34 of the idler wheel 12 is rotatably connected to a yoke 36 via a bearing portion 35. The yoke 36 is connected to a piston 37, and the piston 37 encloses a viscous fluid such as grease inside. It is inserted into the cylinder 38. The cylinder 38 is provided with a spring receiver 39, and a rod 40 is connected to the cylinder 38. The other end side of the rod 40 is inserted into a spring receiver 41, and the rod 40 can slide on the spring receiver 41. Between both spring receivers 39 and 41, a spring 42 for biasing the piston 37 in a direction protruding from the cylinder 38 is mounted. As a result, the crawler belt 13 has an appropriate tension, and when the crawler belt 13 collides with an obstacle, the piston 37, the spring receiver 39, the cylinder 38, and the rod 40 of the crawler belt tension adjusting means 51 move together to move the spring. By compressing 42, a buffering effect is exhibited. The crawler belt tension adjusting means 51 configured as described above extends from the inside of the side frame 10 through the end plate 14, and the yoke 36 is sandwiched between the clamping plate bodies 33 b and 33 c of the mounting bracket 33, It is movable in the front-rear direction along the plate bodies 33b and 33c. There exists a thing shown by patent document 1 as this kind of prior art.

Japanese Patent Laid-Open No. 10-245869

  18 is a diagram for explaining a problem when receiving a lateral load in the prior art shown in FIG. 15, and FIG. 19 is a diagram for explaining a problem when receiving a vertical load in the prior art shown in FIG. .

  By the way, a crawler type vehicle such as a hydraulic excavator may travel on a rough road, and the crawler belt 13 frequently floats, tilts, or deviates in the left-right direction due to unevenness of the ground while the vehicle is traveling. Since the idle wheel 12 rolls with respect to the crawler belt 13, forces in various directions, for example, the external force F1 in FIG. 18 and the external force F2 in FIG. Since the idler wheel 12 is supported by the mounting brackets 33 located on the left and right sides thereof, an external force F1 acts on the idler wheel 12 to apply a moment M1 that deforms the attachment bracket 33 outward. Further, when the external force F2 is applied, the mounting bracket 33 is applied with a pushing-up direction, that is, a moment M2.

  Here, in the mounting bracket 33, a box structure portion is formed by the main body plate 33a and the upper and lower clamping plate bodies 33b and 33c, and the strength of the box structure portion is extremely high. However, the portion of the main body plate 33a between the sandwiching plate bodies 33b and 33c has only one plate body made of the main body plate 33a, and the end plate 14 to which the mounting bracket 33 is connected and fixed has a crawler belt tension adjustment. The opening 14a shown in FIG. 15 is formed from the relationship through which the means 51 is inserted, and the box structure is located in the vicinity of this opening. Therefore, the strength of the portion between the upper and lower box structure portions of the mounting bracket 33 and the end plate 14 to which the mounting bracket 33 is fixed is considerably lower than that of the box structure portion.

  From the above, when the direction of the external force F1 of FIG. 18 acts on the idler wheel 12, the load f1 corresponding to the external force F1 acts on the fixing portion of the mounting bracket 33 to the end plate 14, and the phantom line in FIG. As shown, the mounting bracket 33 is bent in the direction of expansion. On the other hand, when an external force F2 of FIG. 19 is applied to the idler wheel 12, a load f2 is applied to the mounting bracket 33. Accordingly, as shown by the phantom lines in FIG. 19, the mounting bracket 33 is deformed in the warping direction, and the end plate 14 is bent. For this reason, the welded portion between the mounting bracket 33 and the end plate 14 is damaged, the welded portion of the holding plate 33b in the mounting bracket 33 is damaged, or the main body plate 33a is deformed. Produce.

  For this reason, in the prior art, it is conceivable to provide ribs or the like on both outer sides of the mounting bracket 33 in order to improve the strength of the end plate 14 and the body plate 33a of the mounting bracket 33. However, if it does in this way, the shape of the outer part of the mounting bracket 33 will become complicated, and there is a concern that earth and sand, foreign substances, etc. accumulate on this outer part.

  The present invention has been made from the above-described prior art, and its purpose is to simplify the shape of the outer portion of the mounting bracket, which can suppress damage and deformation of the mounting bracket. It is in providing the idler wheel support structure of a vehicle.

  In order to achieve this object, the idler wheel support structure for a crawler type vehicle according to the present invention is provided with driving wheels at one end of a side frame disposed on the left and right sides of a track frame, and an end plate at the other end of the side frame. And a pair of left and right mounting brackets extending from the end plate, and a yoke for supporting the idler wheel via a bearing portion is provided between the attachment brackets, the drive wheel and the idler wheel. A crawler-type vehicle idler wheel support in which crawler belt tension adjusting means for moving both the yoke and the idler wheel at the base of the yoke is provided so as to penetrate the end plate. The structure is characterized in that a support member for transmitting a load to the mounting bracket is provided in a yoke portion located between the bearing portion and the end plate.

  In the present invention configured as described above, the distance between the support member and the end plate is shorter than the distance between the bearing portion and the end plate. Therefore, the moment due to the load transmitted to the mounting bracket via the support member is reduced. Can be small. Thereby, simplification of the shape of the outer part of this mounting bracket is realizable, without providing a rib etc. in the outer part of a mounting bracket. That is, the outer portion of the mounting bracket is simplified in shape, and damage and deformation of the mounting bracket and the like can be suppressed.

  The idler wheel support structure for a crawler type vehicle according to the present invention is characterized in that, in the invention, the support member is configured to transmit a load in the vertical and horizontal directions to the mounting bracket. In the present invention configured as described above, a load due to a moment in the vertical and horizontal directions transmitted from the idler wheel to the mounting bracket via the support member is reduced.

  The idler wheel support structure for a crawler type vehicle according to the present invention is the above-described invention, wherein the support member is configured to transmit a vertical load to the mounting bracket, and the bearing portion transmits a horizontal load. It is characterized by consisting of what to do. In the present invention configured as described above, a load caused by a vertical moment transmitted from the idler wheel to the mounting bracket via the support member is reduced.

  The idler wheel support structure for a crawler type vehicle according to the present invention is the above-described invention, wherein the support member is configured to transmit a load in the horizontal direction to the mounting bracket, and the bearing portion transmits a load in the vertical direction. It is characterized by consisting of what to do. In the present invention configured as described above, a load due to a moment in the left-right direction transmitted from the idler wheel to the mounting bracket via the support member is reduced.

  The idler wheel support structure for a crawler type vehicle according to the present invention is characterized in that, in the above invention, a reinforcing rib is provided in the yoke portion between the bearing portion and the support member. In the present invention configured as above, the yoke is reinforced by the ribs, and the ribs are disposed in the pair of mounting brackets, so that the shape of the outer portion of the mounting brackets is not affected.

  In the present invention, since a support member for transmitting a load to the mounting bracket is provided in the yoke portion between the bearing portion and the end plate, a moment due to the load transmitted from the idler wheel to the mounting bracket via the support member is reduced. It can be made smaller, thereby simplifying the shape of the outer portion of the mounting bracket, and damage and deformation of the mounting bracket can be suppressed. Accordingly, it is possible to obtain a reliable idler wheel support structure for a crawler type vehicle without causing the accumulation of earth and sand or foreign matter which is a concern when the shape of the outer portion of the mounting bracket is complicated as in the prior art. it can.

It is a principal part perspective view of 1st Embodiment of the idler wheel support structure of the crawler type vehicle by this invention. It is a cross-sectional view of the first embodiment. It is a side view of a 1st embodiment. It is a perspective view which shows the supporting member with which 1st Embodiment is equipped. It is a cross-sectional view of a second embodiment of the present invention. It is a side view of 2nd Embodiment. It is a perspective view which shows the supporting member with which 2nd Embodiment is equipped. It is a cross-sectional view of the third embodiment of the present invention. It is a side view of 3rd Embodiment. It is a perspective view which shows the supporting member with which 3rd Embodiment is equipped. It is a principal part perspective view of 4th Embodiment of this invention. It is a cross-sectional view of 4th Embodiment. It is a side view of 4th Embodiment. It is a side view of the hydraulic excavator mentioned as an example of a crawler type vehicle. It is a cross-sectional view showing a conventional idler wheel support structure. It is a side view of the conventional idler wheel support structure shown in FIG. It is a front view of the conventional idler wheel support structure shown in FIG. It is a figure explaining the problem when receiving a lateral load in the prior art shown in FIG. It is a figure explaining the problem when receiving the longitudinal load in the prior art shown in FIG.

  Embodiments of the idler wheel support structure for a crawler type vehicle according to the present invention will be described below with reference to the drawings. The basic structure of the overall structure of the crawler type vehicle, the traveling unit constituting the traveling body, and the frame structure is the same as that described above, for example. Therefore, in the following, the same members as those described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 1 is a perspective view of an essential part of a first embodiment of the idler wheel support structure for a crawler type vehicle according to the present invention, FIG. 2 is a transverse sectional view of the first embodiment, FIG. 3 is a side view of the first embodiment, and FIG. FIG. 3 is a perspective view showing a support member provided in the first embodiment.

  In the first embodiment of the present invention, as shown in the idler wheel support structure 50 in FIG. 1, the yoke 44 has a bifurcated bifurcated shape, and the shaft 34 of the idler wheel 12 is formed on the tip side of the yoke 44. A pair of left and right bearings 43 to which are attached are connected and fixed with bolts.

  Further, a support member 45 </ b> A that transmits a load from the idler wheel 12, for example, a load in the vertical and horizontal directions to the mounting bracket 33 is provided. The support member 45 </ b> A is connected and fixed with a bolt to the surface of the yoke 44 between the bearing portion 43 and the end plate 14 that faces the mounting bracket 33. The support member 45A has a convex shape as shown in FIG. 4, and the clearance between the holding plate bodies 33b and 33c of the surface 45A1 for transmitting the load in the left-right direction and the surface 45A2 for transmitting the load in the up-down direction is determined by the bearing. It attaches so that it may become narrower than the clearance of the part 43 and the clamping plate bodies 33b and 33c. Further, the crawler belt tension adjusting means 51 in FIG. 1 is the same as that described above, and includes a piston 37, a cylinder 38, spring receivers 39 and 41, a rod 40, and a spring 42. An idler wheel support structure 50 is connected to the crawler belt tension adjusting means 51, and the idler wheel support structure 50 is moved in the front-rear direction between the holding plate bodies 33 b and 33 c shown in FIGS. 2 and 3 by the crawler belt tension adjusting means 51. Thus, the tension of the crawler belt 13 can be adjusted. The outer portion of the mounting bracket 33 is formed in a simple shape equivalent to the conventional one.

  In the first embodiment configured as described above, the support member that receives the load in the vertical and horizontal directions from the idler wheel 12 on the yoke 44 portion behind the bearing portion 43 and contacts the holding plate bodies 33b and 33c of the mounting bracket 33. By providing 45A, the following effects are obtained.

  That is, the lateral external force F1 shown in FIG. 2 acts on the idler wheel 12 in a situation where the traveling body 1 gets over the unevenness of the ground while the traveling body 1 travels, and the crawler belt 13 frequently floats, tilts, or shifts in the left-right direction. When the idler wheel support structure 50 moves along the direction of the external force F1, the surface 45A1 of the support member 45A fixed to the yoke 44 comes into contact with the holding plate 33b, and the load f1 is transmitted to the mounting bracket 33. As a result, the mounting bracket 33 receives the load f1 at a position closer to the end plate 14 than the bearing portion 43, and the moment M1 for expanding the mounting bracket 33 is reduced. Therefore, deformation of the mounting bracket 33 can be suppressed. When the idler wheel 12 is subjected to the external force F2 in the vertical direction shown in FIG. 3 and the idler wheel support structure 50 moves along the direction of the external force F2, the surface 45A2 of the support member 45A fixed to the yoke 44 becomes the clamping plate. The load f2 is transmitted to the mounting bracket 33 by contacting the body 33c. As a result, the mounting bracket 33 receives the load f2 at a position closer to the end plate 14 than the bearing portion 43, and the moment M2 that turns the end plate 14 is reduced. Therefore, deformation of the end plate 14 can be suppressed.

  As described above, according to the first embodiment, the shape of the outer portion of the mounting bracket 33 is simplified, and accumulation of earth and sand, foreign matters, and the like, which are a concern when the shape of the outer portion of the mounting bracket 33 is complicated, occurs. In this way, a reliable crawler type idler support structure 50 can be obtained.

  FIG. 5 is a cross-sectional view of a second embodiment of the present invention, FIG. 6 is a side view of the second embodiment, and FIG. 7 is a perspective view showing a support member provided in the second embodiment.

  In the second embodiment, a support member 45 </ b> B that transmits a load from the idler wheel 12, for example, a load f <b> 2 in the vertical direction, to the mounting bracket 33 is provided in a portion of the yoke 44 between the bearing portion 43 and the end plate 14. The clearance between the surface 45B1 for transmitting the load f2 in the vertical direction of the support member 45B in FIG. 7 and the holding plate body 33c is set to be narrower than the clearance between the bearing portion 43 and the holding plate body 33c. Yes. The load f1 in the left-right direction from the idler wheel 12 is transmitted to the mounting bracket 33 via the bearing portion 43. Other configurations are the same as those of the first embodiment.

  In the second embodiment configured as described above, the support member 45B that receives the vertical load f2 from the idler wheel 12 on the yoke 44 portion behind the bearing portion 43 and contacts the holding plate body 33c of the mounting bracket 33 is provided. By providing, the following effects are obtained.

  That is, when the traveling body 1 travels over the unevenness of the ground and the crawler belt 13 frequently floats, tilts, or shifts in the left-right direction, a vertical external force F2 shown in FIG. When the idler wheel support structure 50 moves along the direction of the external force F2, the surface 45B1 of the support member 45B fixed to the yoke 44 comes into contact with the holding plate 33c, and the load f2 is transmitted to the mounting bracket 33. As a result, the mounting bracket 33 receives the load f2 at a position closer to the end plate 14 than the bearing portion 43, and the moment M2 that turns the end plate 14 is reduced. Therefore, deformation of the end plate 14 can be suppressed.

  The second embodiment configured in this way also has a reliable crawler type idler wheel support structure that does not cause sedimentation of earth and sand and foreign matters that are concerned when the shape of the outer portion of the mounting bracket 33 is complicated. 50 can be obtained.

  FIG. 8 is a cross-sectional view of the third embodiment of the present invention, FIG. 9 is a side view of the third embodiment, and FIG. 10 is a perspective view showing a support member provided in the third embodiment.

  In the third embodiment, a support member 45 </ b> C that transmits a load from the idler wheel 12, for example, a load f <b> 1 in the left-right direction, to the mounting bracket 33 is provided at a portion of the yoke 44 between the bearing portion 43 and the end plate 14. The clearance between the surface 45C1 for transmitting the load in the left-right direction of the support member 45C in FIG. 10 and the sandwiching plate 33b is attached so as to be narrower than the clearance between the bearing 43 and the sandwiching plate 33b. The vertical load f2 from the idler wheel 12 is transmitted to the mounting bracket 33 via the bearing portion 43. Other configurations are the same as those of the first embodiment.

  In the third embodiment configured as above, the support member 45 </ b> C that receives the load f <b> 1 in the left-right direction from the idler wheel 12 at the yoke 44 portion behind the bearing portion 43 and abuts against the holding plate body 33 b of the mounting bracket 33 is provided. By providing, the following effects are obtained.

  That is, the lateral external force F1 shown in FIG. 8 acts on the idler wheel 12 in a situation where the traveling body 1 climbs over the unevenness of the ground while traveling and the crawler belt 13 frequently floats, tilts, or shifts in the left-right direction. When the idler wheel support structure 50 moves along the direction of the external force F <b> 1, the surface 45 </ b> C <b> 1 of the support member 45 </ b> C fixed to the yoke 44 contacts the holding plate body 33 b, and the load f <b> 1 is transmitted to the mounting bracket 33. As a result, the mounting bracket 33 receives the load f1 at a position closer to the end plate 14 than the bearing portion 43, and the moment M1 for expanding the mounting bracket 33 is reduced. Therefore, deformation of the mounting bracket 33 can be suppressed.

  The third embodiment configured in this way also has a reliable crawler type idler wheel support structure that does not cause accumulation of earth and sand or foreign matter which is a concern when the shape of the outer portion of the mounting bracket 33 is complicated. 50 can be obtained.

  FIG. 11 is a perspective view of an essential part of the fourth embodiment of the present invention, FIG. 12 is a transverse sectional view of the fourth embodiment, and FIG. 13 is a side view of the fourth embodiment.

  In the fourth embodiment, a reinforcing rib 46 for external forces F1 and F2 in the vertical and horizontal directions is joined and fixed to the yoke 44 portion between the bearing portion 43 and the support member 45A by welding means. Other configurations are the same as those of the first embodiment.

  In the fourth embodiment configured as described above, by providing the support member 45A, the same operational effect as that of the first embodiment can be obtained, and in particular, the reinforcing member is provided between the bearing portion 43 and the support member 45A. By providing the rib 46, the following actions are obtained.

  That is, when the traveling body 1 travels over the unevenness of the ground and the crawler belt 13 is lifted, tilted, or shifted in the left-right direction, the loads f1, f2 in the up-down, left-right directions act as described above. At this time, a load is applied between the bearing portion 43 of the yoke 44 and the support member 45A. However, since the yoke 44 is reinforced by the ribs 46, deformation of the yoke 44 can be suppressed.

DESCRIPTION OF SYMBOLS 1 Traveling body 10 Side frame 11 Drive wheel 12 Idle wheel 13 Crawler belt 14 End plate 14a Opening part 33 Mounting bracket 33a Main body plate 33b Holding plate body 33c Holding plate body 34 Shaft 43 Bearing part 45A Support member 45A1 surface 45A2 surface 45B2 support member 45B Surface 45C support member 45C1 surface 46 rib 50 idler wheel support structure 51 crawler belt tension adjusting means F1 external force f1 load M1 moment F2 external force f2 load M2 moment

Claims (5)

Driving wheels are provided at one end of the side frame disposed on the left and right sides of the track frame, and an end plate is fixedly provided at the other end of the side frame, and a pair of left and right mounting brackets extend from the end plate, A yoke for supporting the idler wheel via a bearing portion is provided between the mounting brackets, a crawler belt is wound around the drive wheel and the idler wheel, and the yoke and the idler are provided at the base of the yoke. In the idler wheel support structure of a crawler type vehicle in which crawler belt tension adjusting means for moving the wheels together is provided so as to penetrate the end plate,
An idler wheel support structure for a crawler type vehicle, wherein a support member for transmitting a load to the mounting bracket is provided in a yoke portion located between the bearing portion and the end plate. In the idler wheel support structure of the crawler type vehicle according to claim 1,
The idler wheel support structure for a crawler type vehicle, wherein the support member is configured to transmit a load in the vertical and horizontal directions to the mounting bracket. In the idler wheel support structure of the crawler type vehicle according to claim 1,
The idler wheel support structure for a crawler type vehicle, wherein the support member is configured to transmit a load in the vertical direction to the mounting bracket, and the bearing portion transmits a load in the horizontal direction. In the idler wheel support structure of the crawler type vehicle according to claim 1,
The idler wheel support structure for a crawler type vehicle, wherein the support member is configured to transmit a load in a left-right direction to the mounting bracket, and the bearing portion is configured to transmit a load in a vertical direction. In the idler wheel support structure of the crawler type vehicle according to any one of claims 1 to 4,
An idler wheel support structure for a crawler type vehicle, wherein a reinforcing rib is provided in the yoke portion between the bearing portion and the support member.

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