JP4486467B2 - Track roller guard structure for crawler type vehicles - Google Patents

Description

  The present invention relates to a track roller guard structure for protecting a track roller of a crawler type vehicle suitable for a work machine.

Some crawler type vehicles such as work machines include a track roller guard for protecting the track roller.
For example, FIG. 5 shows a track roller guard mounted on a lower traveling body of a hydraulic excavator which is an example of a work machine. In each of FIGS. 5A to 5C, the track roller guard is a solid line. The body of the lower traveling body is indicated by a two-dot chain line.

  As shown in the side view of FIG. 5A, track roller frames 3 are respectively provided on both sides of the body 2 of the lower traveling body 1, and a plurality of track rollers 4 can be freely rotated on each track roller frame 3. It is supported. The track roller guard 10 is attached to the lower part of the track roller frame 3 so as to cover the plurality of track rollers 4 from the left and right sides. Note that the left and right track roller guards 10 are configured to be exactly the same as each other or symmetrically (plane symmetrical).

  As shown in FIGS. 5 (a), 5 (b), 6 and 7, the track roller guard 10 includes a pair of left and right guard bodies 11, 12 disposed on the left and right sides of the track roller 4, and left and right guard bodies. 11 and 12 and a plurality of pipes 13 that join together. In the example shown in FIG. 6, each guard body 11, 12 is divided into two parts in the front-rear direction. The outer guard body 11 and the inner guard body 12 are formed to be substantially plane-symmetric with each other.

  The guard main body 11 will be described as an example. The guard main body 11 is located above the bottom plate (guard panel portion) 11a disposed on the lower side of the track roller 4 and the inner edge of the bottom plate 11a for each mounting position of each pipe 13. A plurality of vertical plates (standing wall panel portions) 11b erected on the top, and a top plate (frame coupling panel portion) disposed substantially horizontally from the upper end portion of each vertical plate 11b to the outside and coupled to the track roller frame 3 11c, a reinforcing rib 11d connected to both front and rear edges of each vertical plate 11b and erected from the bottom plate 11a to the top plate 11c, and a lower portion between the reinforcing ribs 11d so as to be connected to the bottom plate 11a. And a reinforcing rib 11e.

  The bottom plate 11 a is disposed close to the track shoe 5 and is disposed in a state where the bottom plate 11 a is inclined slightly outward from the opposing surface (inner side surface) of the track shoe 5. This is because when the track roller 4 side (that is, the track roller frame 3, the track roller 4 and the track roller guard 10) is inclined relatively to the side with respect to the track shoe 5, this inclination is within a minute range. In addition, the inclination of the track roller 4 is restricted by the bottom plate 11a of the track roller guard 10 coming into contact with the inner surface of the track shoe 5 so that the track roller 4 does not come off the track link 6. (See Patent Document 1).

  In particular, when used in a site with severe irregularities such as in a forest, the track shoe 5 is twisted and fluttered, thereby reducing the life of the track link 6. The bottom plate 11a of the track roller guard 10 is wide so that the bottom plate 11a of the track roller guard 10 abuts against the inner surface of the track shoe 5 and this deformation can be restricted.

  Since the installation interval of the track roller 4 decreases toward the front and rear ends, a plurality of pipes 13 are arranged at intervals corresponding to this, and the longitudinal length of each vertical plate 11b and each top plate 11c (track roller guard) (Length in the extending direction of 10) is also configured to become smaller toward the front and rear ends. However, in each of the vertical plate 11b and the top plate 11c, the structure itself composed of the panel portions 11b and 11c and the reinforcing ribs 11d and 11e is similarly configured.

Further, mounting bolt holes 11f and 11g are formed in the vertical plate 11b and the top plate 11c.
Similarly to the guard body 11, the guard body 12 also includes a bottom plate 12a, a vertical plate 12b, a top plate 12c, reinforcing ribs 12d and 12e, and mounting bolt holes 12f and 12g.
In order to attach the track roller guard 10 to the track roller frame 3, as shown in FIG. 7, the frame mounting bolts 14 are inserted into the bolt holes 11g, 12g of the top plates 11c, 12c of the guard bodies 11, 12, respectively. By fastening to the frame 3, the guard bodies 11, 12 are fixed to the track roller frame 3, and pipes 13 are interposed between the vertical plates 11b, 12b of the guard bodies 11, 12, and bolt holes 11f. , 12f, the guard bodies 11, 12 are coupled to each other by fastening a nut 16 to a long cross bolt 15 penetrating the pipe 13.
No. 7-26223

  By the way, in the structure of the conventional track roller guard described above, by providing the reinforcing ribs 11d, 11e, 12d, and 12e, the bottom plates 11a and 12a, the vertical plates 11b and 12b, the top plates 11c and 12c, and the reinforcing ribs 11d and 12d are used. In this case, the rigidity of the guard bodies 11 and 12 is greatly increased, and the track roller guard 10 is further brought into contact with the inner surface of the track shoe 5 in order to protect the track roller 4. By doing so, the relative inclination between the track shoe 5 and the track roller 4 side is regulated, and this is advantageous in preventing the track roller 4 from being detached from the track link 6.

  However, the periphery of the vertical plate 12b is surrounded in a box shape by the bottom plate 12a, the top plate 12c, and the reinforcing rib 12d. Particularly, since the vertical plate 12b is recessed, when inserting the cross bolt 15 into the bolt hole 12f. In addition, when the nut 16 is fastened to the cross bolt 15, the reinforcing rib 11d hinders the workability, and as shown in FIG. The rib 11d interferes with the air tool (ratchet wrench) 7 and cannot be used unless the air tool 7 has a specific shape. For this reason, fastening of many cross volt | bolts 15 and the bolt nut 16 must be performed by manual work, workability | operativity is bad, a work burden is large, and work efficiency is also low.

In addition, the cross bolt 15 is expensive and increases the cost of the parts, and the nut 16 must be tightened while fixing the head side of the cross bolt 15 at the time of fastening. A person is required and cannot work alone. From this point of view, the workability is poor, resulting in an increase in work load and a decrease in work efficiency.
Thus, in order to attach the track roller guard 10, the workability is poor and the work load is large. However, when the track roller guard 10 is removed, the workability is similarly poor and the work load is large.

  On the other hand, there are many cases where the track roller 4 needs to be replaced due to oil leakage, treading of the tread surface, and the like. In such a case, since the bottom plate 11a of the track roller guard 10 becomes an obstacle when the track roller 4 is removed, the track roller 4 is usually removed after the track roller guard 10 is removed and a new track roller is removed. After attaching 4, the procedure of attaching the track roller guard 10 is required. At this time, the weight and size of each track roller 4 are not so large, so the burden of replacement work is not large. However, the track roller guard 10 is heavy, and the bolts 14 and 15 are fastened as described above. Since the work must be done manually by a human being, the work load on the track roller guard 10 is extremely large, and the maximum load when the track roller 4 is replaced.

  The present invention has been devised in view of such problems, and can be easily attached to and detached from the frame while using an air tool or the like to reduce the work load not only when assembling but also when replacing the track roller. An object of the present invention is to provide a track roller guard structure for a crawler type vehicle that can be made.

In order to achieve the above object, a track roller guard structure for a crawler type vehicle according to the present invention is attached to a track roller frame of a crawler type vehicle, and is provided side by side in the vehicle length direction of the vehicle supported by the track roller frame. A track roller guard that protects a plurality of track rollers, and is disposed between the plurality of track rollers so as to extend in an axial direction and a vertical direction of the track rollers, and is disposed on the track roller frame. A plurality of cross plates having tapped holes for attaching bolts at both ends in the axial direction, and bottom plates disposed on the left and right sides of the plurality of track rollers and below the plurality of track rollers, A vertical plate standing above the bottom plate, and reinforcing ribs fixed to the upper surface of the bottom plate and the outer surface of the vertical plate. Are coupled to each cross plate above SL by the mounting bolt screwed into tapped holes in corresponding end portions of the over bets, a pair of left and right guard body, the tap holes on both end faces of the cross plates is directly formed, both end faces of the cross plates are formed to be inclined slightly downward from the lead straight direction, the guard main body described above, attached in a state of being slightly inclined from the vertical direction are joined to the respective end faces of the cross plates (Claim 1).

It is preferable that one reinforcing rib is provided corresponding to each other between adjacent track rollers of the plurality of track rollers .

The cross plates are preferably welded to the upper to the track roller frame (claim 3).
Alternatively, the cross plates are preferably bolted to the top to the track roller frame (claim 4).
Further, the axial length of the cross-plate is preferably set in the axial direction length equal to or more of said track rollers (claim 5).

In particular, the axial length of the cross plate is set to be larger than the axial length of the track roller, and the bottom plate is preferably formed with a notch that allows the track roller to be removed downward ( Claim 6 ).
Further, when the track roller guard is attached to the track roller frame, an inclination angle extending outwardly from the vehicle side is formed between the lower surface of the bottom plate and the upper surface of the track shoe facing the lower surface, and the inner surface of the bottom plate it is preferable that predetermined gap is formed between the track pin outer end facing the inner side (the claim 7).

The track roller guard structure for a crawler type vehicle according to the present invention is a track roller guard that is attached to a track roller frame of a crawler type vehicle and protects a plurality of track rollers provided supported by the track roller frame. A bottom plate disposed on the left and right sides of the plurality of track rollers, disposed below the track roller, a vertical plate standing above the bottom plate, and fixed to an upper surface of the bottom plate and an outer surface of the vertical plate A pair of left and right guard bodies coupled to the track roller frame at the top, and a pipe member interposed between the pair of guard bodies to couple the pair of guard bodies. In addition, the bottom plate is formed with a notch that allows the track roller to be removed downward, and the vertical plate moves the track roller downward. So as not to interfere during removal, it is characterized in that is provided only in the gap portion between each other each track rollers adjacent track roller of the plurality of (claim 8).

  According to the track roller guard structure of the crawler type vehicle of the present invention, the cross plate is fixed to the track roller frame, and the left and right guard bodies are coupled to the cross plate, and the cross plate is a lateral surface of the vehicle. Since it has a surface connection structure consisting of the bottom plate and vertical plate of the guard body which is the vertical surface, it is easier to ensure rigidity than the structure where the left and right guard bodies are connected by pipes and cross bolts, and the top surface of the bottom plate The density of the reinforcing ribs connecting the outer surface of the vertical plate and the vertical plate can be reduced to such an extent that it does not get in the way when using an air tool or the like.

This makes it possible to attach / remove the guard body to / from the cross plate using a widely used air tool, improving attachment / detachment workability, and making it easy to attach / detach the track roller guard to / from the track roller frame. It can be as becomes, assembly time, of course, ing so can reduce the work load even during replacement of the track rollers with the attachment and detachment of the track roller guard.
Also, when the track shoe below the track roller frame is deformed by the unevenness of the grounding surface and collides with the track roller frame, the track roller frame receives a push-up force, but tap holes are directly formed on both end surfaces of the cross plate. By forming both end faces so as to be inclined slightly to the side of the vehicle, and attaching each guard body to each end face and attaching it in a slightly inclined state from the vertical direction, the above thrust force causes the cross plate to move from the track roller frame. As a result, it is smoothly transmitted to the track roller frame, and the deformation of the track shoe can be reliably suppressed.

If one reinforcing rib is provided for each position between multiple track rollers, the rigidity of the track roller frame is reduced while reducing the reinforcing ribs to the extent that it does not interfere with the use of an air tool. And strength can be ensured (claim 2) .

Further, if the upper part of the cross plate is welded to the track roller frame, the cross plate can be firmly fixed to the track roller frame (Claim 3 ), and the upper part of the cross plate is bolted to the track roller frame. If configured to do so, the cross plate can be attached and detached, and it is also possible to replace the track roller frame with a different type (claim 4 ).

By setting the axial length of the cross plate to be approximately the same as or longer than the axial length of the track roller, the guard body coupled to both ends of the cross plate is disposed on the lateral side of the vehicle, Workability at the time of attaching / detaching the guard body to / from the cross plate from the outside of the vehicle side is improved (Claim 5 ).
In particular, the axial length of the cross plate is set to be larger than the axial length of the track roller, and the bottom plate is formed with a notch that allows the track roller to be removed downward, so that the track roller guard can be removed. The track roller can be removed downward from the track roller frame without interfering with the vertical plate and the bottom plate coupled to the cross plate. Similarly, the track roller guard can be attached to the track roller frame. This can be carried out without detaching, and the track roller can be replaced easily (claim 6 ).

When the track roller guard is attached to the track roller frame, an inclination angle extending outward from the vehicle side is formed between the bottom surface of the bottom plate and the top surface of the track shoe facing the bottom surface. If a predetermined gap is formed between the track pin and the outer end of the track pin, the deformation of the track shoe that follows the unevenness of the ground contact surface within a certain range defined by the above inclination angle and gap Furthermore, the deformation of the track shoe beyond this certain range is restricted by the contact between the bottom surface of the bottom plate and the top surface of the track shoe, or the contact between the inner surface of the bottom plate and the outer end of the track pin. track shoe can be prevented from coming off the track links (claim 7).

Further, according to the track roller guard structure of the crawler type vehicle of the present invention, the track roller can be removed downward from the track roller frame without interfering with the vertical plate and the bottom plate coupled to the cross plate. also attached to the track roller frame of a track roller, can be performed without removing the track roller guard, it is possible to easily perform the replacement operation of the track roller (claim 8).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIG. 1. FIG. 1 (a) is a perspective view showing a mounting state of a track roller guard according to the first embodiment, and FIG. 1 (b) is an end face thereof. FIG. 1 (c) is a perspective view of the cross plate.

  As shown in FIG. 1A, the track roller guard 20 includes a pair of left and right guard bodies 21 and 22 disposed on the left and right sides of the track roller 4, and a plurality of left and right guard bodies 21 and 22. A cross plate 23 is provided. Also in the case of this embodiment, each guard main body 21 and 22 is divided into two parts in the front-rear direction, and FIG.

Such track roller guards 20 are disposed on both sides of the body 2 of the lower traveling body 1 and are attached to a track roller frame 3 that rotatably supports a plurality of track rollers 4 as in the prior art. [See FIG. 5 (a)].
Moreover, as shown in FIG.1 (b), the outer guard main body 21 and the inner guard main body 22 are formed in plane symmetry mutually. Then, the left and right track roller guards 20, 20 are also configured exactly the same shape as each other.

  As shown in FIGS. 1 (a) and 1 (b), the guard bodies 21 and 22 include bottom plates (guard panel portions) 21a and 22a disposed on the lower side portions of the track roller 4, and top surfaces of the bottom plates 21a and 22a. Vertical plates (standing wall panel portions) 21b and 22b erected upward from the top, and a plurality of reinforcing ribs 21c and 22c fixed to the upper surfaces of the bottom plates 21a and 22a and the outer surfaces of the vertical plates 21b and 22b. Yes. In the present embodiment, one reinforcing rib 21c, 22c is provided for each position between the plurality of track rollers 4.

Cross plates 23, as shown in FIG. 1 (c), is composed of a thick plate material, is disposed along the axis Direction of the track roller 4 the extended beauty lead straight direction therebetween track roller 4, It couple | bonds with the track roller frame 3 [refer Fig.1 (a), (b)]. End surfaces 23a to which the longitudinal plates 21b and 22b of the guard bodies 21 and 22 are coupled are formed at both ends of the cross plate 23 in the track roller axial direction, and tapped holes for attaching two bolts to the end surfaces 23a. 23d is drilled.

  Further, the end surface 23a is formed so as to be inclined slightly to the side of the vehicle. Further, notches are processed at both ends of the upper surface of the cross plate 23 in accordance with the shape of the left and right mounting portions of the track roller frame 3, and the notched surfaces 23 b and 23 c are formed on the left and right mounting portions of the track roller frame 3. The cross plate 23 is coupled to the track roller frame 3 by being welded to the track roller frame 3.

  On the other hand, bolt insertion holes (bolt holes) 21d, 22d are formed in the vertical plates 21b, 22b of the guard bodies 21, 22 corresponding to the tap holes 23d of the end surface 23a. After the cross plates 23 are joined to the track roller frame 3, the guard bodies 21 and 22 are joined to the end faces 23a of the cross plates 23 with the vertical plates 21b and 22b, and the mounting bolts 24 are screwed into the tap holes 23d. It is attached by doing.

Thereby, as shown in FIG. 1B, the track roller guard 20 has the vertical plates 21b and 22b of the guard bodies 21 and 22 slightly inclined from the vertical direction corresponding to the end face 23a of the cross plate 23. In the state, it is attached to the track roller frame 3.
Further, in this mounted state, a predetermined inclination angle θ that spreads outward in the lateral direction of the vehicle is formed between the lower surfaces 21aa, 22aa of the bottom plates 21a, 22a and the upper surface 5a of the track shoe 5 facing the lower surfaces 21aa, 22aa. Is set to be. In addition, a predetermined gap d is set between the inner side surfaces 21ab and 22ab of the bottom plates 21a and 22a and the outer end 8a of the track pin 8 facing the inner side surfaces 21ab and 22ab.

  The track roller guard structure according to the first embodiment of the present invention is configured as described above. The cross plate 23 is fixed to the track roller frame 3, and the left and right guard bodies 21, 22 are attached to the cross plate 23. Combined, a surface coupling comprising a cross plate 23 which is a lateral (vehicle width direction) surface of the vehicle and a bottom plate 21a, 22a and vertical plates 21b, 22b of guard bodies 21, 22 which are longitudinal (vehicle length direction) surfaces. Since it has a structure, it becomes easier to ensure rigidity than a structure in which the left and right guard bodies are connected by pipes and cross bolts.

  Thus, since the rigidity of the track roller guard 20 can be ensured without greatly depending on the reinforcing ribs 21c and 22c, it is not necessary to arrange the reinforcing ribs 21c and 22c at a high density, as in this embodiment. It is sufficient to provide one reinforcing rib 21c, 22c corresponding to the position between the plurality of track rollers 4 one by one. As a result, the reinforcing ribs 21c and 22c can be reduced to such an extent that they do not get in the way when the air tool 7 (see FIG. 8) or the like is used. The mounting / dismounting of the track roller guard 20 to the track roller frame 3 is improved, and the track roller guard 20 can be easily mounted / removed to / from the track roller frame 3. There is an effect that the work load can be reduced even when the track roller 4 is replaced with the attachment / detachment of the track 20.

  Further, as a large force applied to the track roller guard 20, a pushing force F applied when the track shoe 5 below the track roller frame 20 is deformed by the unevenness of the ground surface and collides with the track roller frame 20 [FIG. However, in the case of the present embodiment, since the joint surfaces (end surfaces 23a) of the cross plates 23 and the vertical plates 21b and 22b are inclined slightly downward from the vertical direction, this push-up force F Is transmitted smoothly from the guard bodies 21 and 22 to the track roller frame 3 through the cross plate 23 and is received by the high rigidity of the track roller frame 3.

Therefore, there is an effect that the rigidity and strength required for the track roller guard 20 are further ensured, and the above deformation of the track shoe 5 can be reliably suppressed.
Further, a predetermined oblique angle θ is formed between the lower surfaces 21aa, 22aa of the bottom plates 21a, 22a and the track shoe upper surface 5a so as to spread outward in the lateral direction of the vehicle, and inner surfaces 21ab, 22ab of the bottom plates 21a, 22a Since a predetermined gap d is formed between the outer end 8a, the deformation of the track shoe 5 following the unevenness of the ground contact surface is allowed within a certain range defined by the inclination angle θ and the gap. Can do.

  The deformation of the track shoe 5 beyond a certain range may be caused by the contact between the lower surfaces 21aa, 22aa of the bottom plates 21a, 22a and the track shoe upper surface 5a, the inner side surfaces 21ab, 22ab of the bottom plates 21a, 22a and the outer ends of the track pins. Since it is regulated by contact with 8a, the track shoe 5 can prevent the track roller 4 from being detached from the track link 6. At this time, as described above, since the rigidity of the track roller guard 20 is sufficiently secured, excessive deformation of the track shoe 5 can be surely suppressed, and the effect of preventing the track roller 4 from being detached from the track link 6 is ensured. Can get to.

  In the present embodiment, the cross plate 23 is a single plate and the upper part of the cross plate 23 is joined to the track roller frame 3 by welding, so that the structure is simple and advantageous in terms of cost. There is also an effect that the cross plate 23 can be firmly fixed to the track roller frame 3.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. 2 and 3. FIG. 2 (a) is a perspective view showing a mounting state of the track roller guard according to the first embodiment, and FIG. ) Is an end view thereof, FIG. 2C is a perspective view of the cross plate, and FIG. 3 is a diagram showing a track roller guard [FIG. 3A] according to the present embodiment. FIG.

  As shown in FIG. 2A, the track roller guard 30 also includes a pair of left and right guard bodies 31 and 32 disposed on the left and right sides of the track roller 4 and a plurality of left and right guard bodies 31 and 32 coupled to each other. A cross plate 33 is provided. Also in the present embodiment, each guard body 31, 32 is divided into two parts in the front-rear direction, and FIG. 2 shows only one of the front and rear parts.

Such track roller guards 30 are also mounted on the track roller frame 3 that is disposed on both sides of the body 2 of the lower traveling body 1 and rotatably supports the plurality of track rollers 4 as in the prior art. [See FIG. 5 (a)].
Further, as shown in FIG. 2B, the outer guard body 31 and the inner guard body 32 are formed symmetrically with each other. For this reason, the track roller guard 30 can be used in common for the left and right frames.

  As shown in FIGS. 2 (a) and 2 (b), the guard main bodies 31 and 32 have bottom plates (guard panel portions) 31a and 32a arranged at the lower side portions of the track roller 4, as shown in FIGS. A plurality of reinforcements fixed to the upper surfaces of the bottom plates 31a and 32a and the upper surfaces of the bottom plates 31a and 32a and the outer surfaces of the vertical plates 31b and 32b. Ribs 31c and 32c are provided. Also in this embodiment, the reinforcing ribs 31c and 32c are provided one by one corresponding to the positions between the plurality of track rollers 4.

On the other hand, as shown in FIG. 2C, the cross plate 33 is coupled to the cross plate main body 33a, end plates 33b and 33b coupled to both ends of the cross plate main body 33a, and the upper end of the cross plate main body 33a. The end plate 33b is provided with two bolt insertion holes (bolt holes) 3 3d for attaching the bolts, and the upper plate 33c is provided with two bolts for attaching the two bolts. Bolt insertion holes (bolt holes) 33e are formed. Each cross plate 33 is attached by fastening the upper plate 33c to the track roller frame 3 with a mounting bolt (not shown).

  In the present embodiment, unlike the first embodiment, the end surface of the cross plate 33 (outer surfaces of the end plates 33b and 33b) is set to be vertical (perpendicular to the axial direction of the track roller 4) without being inclined. ing. This is because the longitudinal plates 31b and 32b coupled to the end plates 33b and 33b of the cross plate 33 by fastening bolts 34 and nuts 35 are arranged outside the track roller 4 so that the track roller 4 can be attached and detached. This is to ensure that the vertical plates 31b and 32b do not hinder the work during the bolt fastening operation of the upper plate 33c to the track roller frame 3.

  On the other hand, bolt insertion holes (bolt holes) 31d, 32d are formed in the vertical plates 31b, 32b of the guard bodies 31, 32 corresponding to the bolt holes 33d of the end plates 33b, 33b. After the cross plates 33 are joined to the track roller frame 3, the guard bodies 31 and 32 are joined to the end plates 33b with the vertical plates 31b and 32b, and the mounting bolts 34 are inserted into the bolt holes 31d, 32d and 33d. The nut 35 is attached by screwing and fastening. Each cross plate 33 is coupled to the track roller frame 3 by inserting a mounting bolt (not shown) into the bolt hole 33e and fastening it to a tap hole (not shown) on the track roller frame 3 side.

Thereby, as shown in FIG. 2B, the track roller guard 30 has the vertical plates 31b, 32b of the guard bodies 31, 32 upright in the vertical direction corresponding to the end plates 33b of the cross plate 33. In this state, it is attached to the track roller frame 3.
Further, in this mounted state, as in the first embodiment, the vehicle spreads laterally outward between the lower surfaces 31aa, 32aa of the bottom plates 31a, 32a and the upper surface 5a of the track shoe 5 facing the lower surfaces 31aa, 32aa. A predetermined inclination angle θ is set. Further, a predetermined gap d is set between the inner side surfaces 31ab and 32ab of the bottom plates 31a and 32a and the outer end 8a of the track pin 8 facing the inner side surfaces 31ab and 32ab.

Further, in the present embodiment, the vertical plates 31b and 32b are disposed outside the both ends of the track roller 4, whereas the bottom plates 31a and 32a are more than the vertical plates 31b and 32b as shown in FIG. Further, notches 31e and 32e are formed in a portion corresponding to the portion immediately below the track roller 4 so as to extend inward and to allow the track roller 4 to be removed downward.
Since the track roller guard structure according to the second embodiment of the present invention is configured as described above, a surface coupling structure including the cross plate 33, the bottom plates 31a and 32a of the guard bodies 31 and 32, and the vertical plates 31b and 32b. Thus, as in the first embodiment, it becomes easier to ensure rigidity than the structure in which the left and right guard bodies are coupled by pipes and cross bolts.

  As a result, it is not necessary to dispose the reinforcing ribs 31c and 32c at a high density, and the reinforcing ribs 31c and 32c can be reduced to the extent that they do not interfere with the use of the air tool 7 (see FIG. 8). The attachment / detachment of the guard main bodies 21 and 22 to / from the cross plate 23 can be performed using a commonly used air tool, and the detachability is improved as in the first embodiment. The truck roller frame 3 can be easily attached and detached.

  Similarly to the first embodiment, a predetermined oblique angle θ is formed between the lower surfaces 31aa, 32aa of the bottom plates 31a, 32a and the track shoe upper surface 5a so as to spread outward in the lateral direction of the vehicle, and the bottom plates 31a, 32a Since a predetermined gap d is formed between the inner side surfaces 31ab and 32ab and the outer end 8a of the track pin, the track that follows the unevenness of the contact surface within a certain range defined by the inclination angle θ and the gap. The deformation of the shoe 5 can be allowed. Further, the deformation of the track shoe 5 beyond a certain range is caused by the contact between the lower surfaces 31aa, 32aa of the bottom plates 31a, 22a and the track shoe upper surface 5a, the inner side surfaces 31ab, 32ab of the bottom plates 31a, 32a and the outer ends of the track pins. Since it is regulated by contact with 8a, the track shoe 5 can prevent the track roller 4 from being detached from the track link 6.

  In the case of the present embodiment, notches 31e and 32e are formed in the bottom plates 31a and 32a at portions corresponding to the positions immediately below the track roller 4 so that there are no obstacles. The track roller 4 can be removed downward without removing 30, and the track roller 4 can be attached to and detached from the track roller frame 3 very easily.

Further, since the cross plate 33 is coupled to the track roller frame 3 by bolt fastening, the cross plate 33 can be attached and detached, and can be replaced with a different type of track roller frame.
[Modification]
As a modification of the second embodiment, the one shown in FIG. 4 is also conceivable.

  FIG. 4A shows a structure in which the track roller 4 can be removed downward without removing the track roller guard 10 from the conventional structure shown in FIG. A notch 11h similar to that of the second embodiment is provided, and the vertical plate 11b is provided only in a gap portion between the track rollers 4 so as not to interfere when the track roller 4 is removed downward.

  In FIG. 4B, the track roller 4 can be removed downward without removing the track roller guard 20 with respect to the first embodiment shown in FIG. In addition to providing a notch 21e similar to that of the second embodiment, the lower portion of the vertical plate 21b 'is changed to be substantially vertical without being inclined inward so as not to interfere when the track roller 4 is removed downward. .

  Also with these configurations, the track roller 4 can be removed downward without removing the track roller guards 10 and 20, and the track roller 4 can be attached to and detached from the track roller frame 3 very easily.

[Others]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in each of the embodiments described above, the present invention has been described by taking a hydraulic excavator as an example. However, the present invention is not limited to a hydraulic excavator and can be widely applied to crawler type vehicles including other work machines.
In the above-described embodiment, one reinforcing rib is provided for each of the positions of the plurality of track rollers. However, the present invention is not limited to this.

It is a figure which shows the attachment state of the track roller guard concerning 1st Embodiment of this invention, (a) is the perspective view, (b) is the end elevation, (c) is the perspective view of the cross plate. It is a figure which shows the attachment state of the track roller guard concerning 2nd Embodiment of this invention, (a) is the perspective view, (b) is the end elevation, (c) is the perspective view of the cross plate. It is a bottom view showing a track roller guard according to a second embodiment of the present invention in comparison with a conventional track roller guard, (a) relates to this embodiment, and (b) relates to the prior art. . It is an end view of a track roller guard showing a modification according to the second embodiment of the present invention, (a) shows a first modification, (b) shows a second modification. FIG. 5A shows a conventional track roller guard installed in a hydraulic excavator that is an example of a work machine, and FIG. 5A is a side view of one side showing a mounting state of the track roller guard to a lower traveling body of the hydraulic excavator. 5B is a cross-sectional view of one side portion of the lower traveling body [cross-sectional view taken along the line AA in FIG. 5A], and FIG. 5C is a cross-sectional view of the other side portion of the lower traveling body [ FIG. 6 is a cross-sectional view taken along arrow AA in FIG. It is a perspective view which shows the conventional track roller guard of FIG. FIG. 6 is an end view of the conventional track roller guard of FIG. 5. It is a perspective view of the track roller guard principal part for demonstrating the subject of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Body 3 Track roller frame 4 Track roller 5 Track shoe 6 Track link 7 Air tool 8 Track pin 10, 20, 30 Track roller guard 21, 22, 31, 32 Guard body 11a ', 12a', 21a, 22a, 31a, 32a Bottom plate 11b ', 12b', 21b, 22b, 31b, 32b Vertical plate 11h, 12h, 21e, 22e, 31e, 32e Notch 21c, 22c, 31c, 32c Reinforcement rib 23, 33 Cross plate 23d, 33d Tap hole

Claims (8)

A track roller guard that is attached to a track roller frame of a crawler type vehicle and that is supported by the track roller frame and protects a plurality of track rollers that are arranged in the vehicle length direction of the vehicle,
Between the track rollers, the track rollers are arranged so as to extend in the axial direction and the vertical direction, and upper portions are coupled to the track roller frame, and bolts are attached to both ends in the axial direction. A plurality of cross plates having holes;
A bottom plate disposed on the left and right sides of the plurality of track rollers, disposed below the plurality of track rollers, a vertical plate erected above the bottom plate, and an upper surface of the bottom plate and an outer surface of the vertical plate have anchored reinforcing ribs are coupled to each cross plate above SL by the mounting bolt screwed into tapped holes in corresponding end portions of each cross plate described above, a pair of left and right guard body ,
The tap hole is formed directly on the end faces of the cross plates, both end faces of the cross plates are formed to be inclined slightly downward from the lead straight direction, the guard main body described above is joined to the end faces of the cross plates A track roller guard structure for a crawler-type vehicle, wherein the track roller guard structure is attached with a slight inclination from the vertical direction. 2. The track roller guard structure for a crawler type vehicle according to claim 1, wherein one reinforcing rib is provided in correspondence with each other between adjacent track rollers of the plurality of track rollers. The track roller guard structure for a crawler type vehicle according to claim 1 or 2, wherein the cross plate is welded at an upper portion to the track roller frame. The track roller guard structure for a crawler type vehicle according to claim 1 or 2, wherein the cross plate is bolted at an upper portion to the track roller frame. 5. The crawler-type vehicle according to claim 1, wherein an axial length of the cross plate is set to be equal to or longer than an axial length of the track roller. Track roller guard structure. The axial length of the cross plate is set larger than the axial length of the track roller,
6. The track roller guard structure for a crawler type vehicle according to claim 5, wherein the bottom plate is formed with a notch that allows the track roller to be removed downward. When the track roller guard is attached to the track roller frame, an inclination angle extending outward from the vehicle side is formed between the lower surface of the bottom plate and the upper surface of the track shoe facing the lower surface, and the inner surface of the bottom plate and the The track roller guard structure for a crawler type vehicle according to any one of claims 1 to 6, wherein a predetermined gap is formed between an outer end of the track pin facing the inner surface. A track roller guard which is attached to a track roller frame of a crawler type vehicle and protects a plurality of track rollers provided supported by the track roller frame,
Arranged on the left and right sides of the plurality of track rollers and fixed to a bottom plate disposed below the track rollers, a vertical plate standing above the bottom plate, and an upper surface of the bottom plate and an outer surface of the vertical plate A pair of left and right guard bodies having upper and lower reinforcing ribs and coupled to the track roller frame at the top;
A pipe member interposed between the pair of guard bodies and connecting the pair of guard bodies;
The bottom plate has a notch that allows the track roller to be removed downward, and
The crawler type, wherein the vertical plate is provided only in a gap portion between adjacent track rollers of the plurality of track rollers so as not to interfere when the track rollers are removed downward. Vehicle track roller guard structure.

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