JP3445133B2 - Elastic pads for metal crawlers - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an elastic pad for a metal crawler.

[0002]

2. Description of the Related Art Among endless tracks used for various works such as agriculture, civil engineering, and construction, those equipped with metal crawlers include all the metals that make up the crawlers when traveling on a pavement or the like. It is preferable and required to attach an elastic pad made of rubber or the like to the shoe plate.

This type of elastic pad has a pad main body made of an elastic material such as rubber and a core material made of metal or the like provided on the back surface of the pad main body or inside the pad main body. In the following description, the width direction of the crawler is used as a reference, and the direction parallel to the width direction is also described as the width direction of the elastic pad (pad body and core material). Then, as a structure for mounting the elastic pad to the crawler track plate, a hook portion is provided at one end portion in the width direction of the core material, and with the hook portion engaged with one end portion of the track plate, There is one in which the other end of the core material is connected to the shoe plate by a lock pin that penetrates in the thickness direction (Japanese Patent Laid-Open No. 8-58647).
No.

Although the connection structure by the lock pin described in the above publication allows quick mounting by driving, it is rather troublesome to pull out the lock pin at the time of exchanging the elastic pad, and the lock pin is damaged when pulling out. In some cases, a connecting structure using bolts is applied because the cost may be high.

[0005]

The hook portion of the core material is integrally provided by bending the core material itself into a U shape or by welding another member bent into an L shape to the core material. However, the folding interval in the hook portion is formed slightly larger than the thickness of the crawler shoe plate.
This facilitates engagement / disengagement with the shoe plate,
This is a measure for absorbing the variations (errors) in the formed dimensions of the hook portion and the track plate.

However, for this reason, even when the hook portion is engaged with the shoe plate, the core material has a slight clearance in the contacting / separating direction with respect to the shoe plate. It should be noted that this clearance cannot be eliminated even if the other end of the core material is connected to the shoe plate by a lock pin, a bolt, or the like. For this reason, when traveling vibration is applied to the elastic pad, rattling easily occurs due to the clearance between the hook portion and the track plate, and noise and vibration are generated due to the rattling. Also, it may cause early wear of the hook, loosening of the lock pin or bolt, wear, etc.
In extreme cases, the lock pin or the bolt may be broken.

The present invention has been made in view of the above circumstances, and it is intended that an elastic pad be firmly attached to a shoe plate to prevent rattling during running and various drawbacks associated therewith. An object is to provide an elastic pad for a metal crawler that can be prevented.

[0008]

In order to achieve the above object, the present invention takes the following technical means. That is, the elastic pad according to the present invention has a pad main body made of an elastic material and a core material provided on the back surface side of the pad main body, and the core material has a hook portion to one end in the width direction of the shoe plate. When they are engaged with each other and overlapped on the track plate, a floating gap can be generated between the facing surfaces of the bolt connecting portion and the track plate.

This floating gap is provided by a bolt connecting portion of the core member (when the nut member is integrally provided on the core member and the bolt is screwed from the side of the shoe plate, or when the bolt is fixed to the core member and the nut is attached from the side of the shoe plate). There is a case where they are screwed together) and it is said that it can be solved when fastening to the shoe plate. That is, when the bolts are fastened together, the core material gradually warps as it tries to overlap with the shoe plate, and the levitation gap gradually becomes smaller and eventually disappears. Will be done.

Therefore, at this time, the warpage of the core material itself strongly urges the hook portion of the core material in the direction of pulling out the hook portion from the shoe plate (the radial direction with respect to the circumferential direction of the crawler). Therefore, even if a clearance is generated between the engagement between the hook portion and the shoe plate, and even if traveling vibration is applied to this portion, there is no room for rattling between the hook portion and the shoe plate within this clearance.

The floating gap as described above is generated by providing the core member with an abutting portion which interferes with the superposition of the core plate on the shoe plate. That is, the shoe plate is provided with a ridge portion (grouser or the like) protruding from the outer surface thereof, but the contact portion is a portion near the hook portion in the width direction of the core material (that is, bolt connection). It is located so as to come into contact with the convex surface of the ridge portion at a portion far from the portion).

For example, the core material has a main body portion which is positioned on the convex side of the ridge portion when mounted on the shoe plate, and goes backward from the main body portion in the protruding direction of the ridge portion to the outer surface of the shoe plate. It is assumed that the structure is such that the hook portion is provided via the bent portion toward which the hook portion is provided. In this case, the abutting portion provided on the core material can be provided as a projecting edge formed on a side edge portion of the bent portion.

When the core material has a structure including the above-mentioned main body portion, the main body portion is attached to the track plate (after fastening the bolt connecting portions) of the track plate. It is preferable not to contact the convex surface so that it can be positioned outside the ridge portion with a minute gap maintained.
This is because such a configuration is suitable for absorbing and absorbing traveling vibration and preventing damage to the pad body.

Therefore, it is preferable that the abutting portion provided on the core member has a structure and a position in consideration of the fact that the minute gap can be generated. As described above, the bolt connecting portion provided on the core material can be formed by a bolt through hole that penetrates the core material in the thickness direction. In this case, it is preferable to provide the pad main body with a nut loading hole so as to reach the opening of the bolt through hole facing the pad main body from an appropriate position on the peripheral side surface thereof.

In this structure, the nut is inserted into the elastic pad when the elastic pad is attached to the shoe plate. Therefore, when the elastic pad is manufactured, the nut and Eliminates the need to weld bolts. Therefore, not only the labor of welding is saved, but also the labor of masking nuts and bolts is not required as a pretreatment for shot blasting or adhesive treatment. Also, during handling before and after that (including when handling as an elastic pad), there is no risk of damaging the threads of nuts and bolts, and there is no need for bulky transportation and storage.

In the case of adopting such a structure, it is preferable to provide the core member with the rotation stopping portion for the nut around the bolt through hole in order to facilitate the work of mounting on the track plate. It becomes effective.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 5, the elastic pad 1 according to the present invention is mounted on each of the outer surfaces 2a of a large number of metal crawler plates 2 constituting a metal crawler. The basic structure of the pad main body 4 and the core member 5 provided on the back surface of the pad main body 4 are apparent from the appearance shown in FIGS. 6 and 7 and the front sectional view shown in FIG. And has.

The pad body 4 is made of an elastic material such as rubber or urethane, and the core material 5 is made of a metal material such as iron (integral product obtained by drawing, casting, forging, or a welded assembly of a plurality of members). Has been formed. Both of them are integrated with each other by baking, inserting, adhering or the like. In this elastic pad 1, a hook portion 6 capable of engaging with one end portion of the shoe plate 2 is provided on one widthwise end side of the core material 5, and a bolt connecting portion 7 is provided on the other end portion of the core material 5. It is provided.

In this embodiment, the core member 5 is formed of a drawn iron plate, and the hook portion 6 is provided by folding one end of the core member 5 in a U-turn shape. In this hook part 6,
The inner space of the folded back is formed in such a size that engagement and disengagement with respect to the track plate 2 can be easily performed within a range in which large rattling does not occur when the track plate 2 is engaged with one end side in the width direction. The bolt connecting portion 7 is formed by a bolt through hole 8 that penetrates the core material 5 in its thickness direction.

The track plate 2 is provided with a plurality of ridges 10 such as grousers which project from the outer surface 2a in parallel with each other. Therefore, in order to correspond to this, in the core material 5, the convex surface 1 of each ridge portion 10 when mounted on the track plate 2
The main body 12 is positioned at the 0a side, and on both sides in the width direction of the main body 12, the two branches are bifurcated so that they can be fitted between the protrusions 10, and The outer surface 2a of the track plate 2 is moved backward in the protruding direction of the strip 10.
Bent portions 13 and 14 are provided so as to extend toward.

At each branching end of each of the bent portions 13 and 14, a hook portion 6 and a bolt connecting portion 7 are provided so as to extend outward in the width direction while being branched into two branches. . That is, the intermediate portion of the core material 5 (main body portion 12)
Is projectingly formed toward the ground contact surface side through both end portions and step portions (bending portions 13 and 14), and a hook portion 6 engageable with the shoe plate 2 is provided at one end portion in the width direction. Track 2 on the other end
The bolt connecting portion 7 is provided.

As shown in FIGS. 3 and 4, the bent portion 13 closer to the hook portion 6 is provided with a plurality of upper and lower projecting edges 13a and 13b at its side edge portion. Of these, the overhanging edge 13a near the main body portion 12 serves as an abutting portion 17 that abuts the convex surface 10a of the ridge portion 10 when the core material 5 is superposed on the shoe plate 2. That is, even if the hook portion 6 is engaged with one end of the shoe plate 2 in the width direction and the main body portion 12 of the core material 5 is made to be parallel to the outer surface 2a of the shoe plate 2, the contact portion 1
7 interferes, and the end portion of the core material 5 near the bolt connecting portion 7 is in an inclined state in which it does not approach the track plate 2 for a predetermined amount or more.

As a result, a floating gap 20 as shown in FIG. 1 is produced between the area around the bolt connecting portion 7 of the core 5 and the facing surface of the shoe plate 2. This floating gap 20
Is a bolt insertion hole 22 provided in the track plate 2 (see FIG. 5).
When the bolt 23 is inserted from the back side (downward) of the navel, the tip of the bolt 23 passes through the bolt through hole 8 of the bolt connecting portion 7 in the core material 5 and can be screwed with the nut 24 (see FIG. 2). The size is within the range and can be eliminated after the bolt connecting portion 7 is fastened.

In this embodiment, the main body 12 of the core member 5 does not abut the convex surface 10a of the ridge 10 of the shoe plate 2 even after the bolt connecting portion 7 is fastened, and there is a minute gap 25 there.
The position of the contact portion 17 is set so that That is, the relationship between C and D shown in FIG. 1 and B shown in FIG. 3 is C <B ≦ D, and ideally D−B ≦ 2 mm.

Further, as shown in FIG. 5, the bolt connecting portion 7
The bent portion 14 nearer to is also provided with a plurality of upper and lower projecting edges 14a and 14b at its side edge portion. And, of these, the overhanging edge 14a near the main body portion 12 has the core material 5
The convex surface 10a of the ridge 10 when overlapping
It is a sub-contact portion 26 that comes into contact with. This sub contact part 2
6 is a minute gap 25 between the main body portion 12 of the core material 5 and the ridge portion 10 of the shoe plate 2, together with the contact portion 17 near the hook portion 6.
It has the effect of holding.

From the above, the core member 5 is allowed to elastically deform within the predetermined range of the main body portion 12 when mounted on the track plate 2. Therefore, the elastic pad 1 can satisfactorily absorb and absorb the traveling vibration, and the advantages such as preventing damage to the pad body 4 can be obtained. The nut 2 with respect to the bolt connecting portion 7 of the core material 5.
In order to load the pad body 4, the pad body 4 is provided with a recessed nut loading so as to reach the opening of the core material 5 in the bolt through hole 8 toward the pad body 4 from an appropriate position on the peripheral side surface thereof. A hole 28 is provided.

Inside the nut loading hole 28,
A detent portion 29 is provided that can come into contact with the outer peripheral surface of the nut 24 when the nut 24 is fitted to the bolt through hole 8. The rotation stopping portion 29 is provided on the core material 5, and locally punches the core material 5 itself to form a small curved portion or cuts and raises a part of the core material 5. In the case where the tip is formed by welding, the welding is built up as a weld overlay, or the tip is formed by screwing a screw into the core material 5, or when the core material 5 is manufactured by casting or forging. It is formed integrally during manufacturing.

In order to mount the elastic pad 1 having such a structure on the shoe plate 2, first, the elastic pad 1 is inserted from the widthwise outer side of the crawler so that the hook portion 6 thereof faces inward, and the hook portion 6 is inserted. Is hooked on the rear end of the track plate 2, and then the elastic pad 1 is superposed on the outer surface 2a of the track plate 2. Thereby, as described above, the contact portion 17 of the core material 5
Abutting on the ridge 10 of the shoe plate 2, on the front side, around the bolt connecting portion 7 of the elastic pad 1 and the shoe plate 2
The levitation gap 20 is generated between the surfaces facing with.

Therefore, the nut loading hole 28 of the pad body 4
While loading the nut 24 into the inside, insert the bolt 23 from the back side into the bolt insertion hole 22 of the shoe plate 2,
The screw connection (fastening of the bolt connecting portion 7) is performed. At this time, since the nut 24 inevitably comes into contact with the rotation stopping portion 29 and cannot rotate, only the bolt 23 needs to be rotated, and the work is extremely easy.

When the bolts 23 are tightened in this way, the core material 5 of the elastic pad 1 approaches the track plate 2 with the bolt connecting portion 7 side starting from the contact portion 17 near the hook portion 6. While causing the warp, the floating gap 20 becomes gradually smaller, and is completely eliminated when the bolt 23 is finally strongly tightened, and the main body portion 12 of the core material 5 and the outer surface 2a of the shoe plate 2 are in a parallel state. Overlap.

At this time, as shown in FIG. 2, the warping action in the X direction generated in the core material 5 is caused by the direction in which the hook portion 6 is pulled out from the shoe plate 2 (outer diameter relative to the circumferential direction of the crawler as indicated by the arrow Y). Direction), the clearance generated in the hook portion 6 is the outer surface 2a of the shoe plate 2.
It will be fixed while being biased to the side. Therefore, there is no room for rattling between the hook portion 6 and the track plate 2 within this clearance, and the mounting state of the elastic pad 1 on the track plate 2 becomes extremely strong.

FIG. 9 shows a second part of the elastic pad 1 according to the present invention.
1 illustrates an embodiment. In the second embodiment, the core material 5
In order to generate a levitation gap 20 between the area around the bolt connecting portion 7 and the crawler plate 2, a protrusion-shaped contact portion 17 is provided near the hook portion 6 with respect to the main body portion 12 of the core material 5. It is a thing. In this case, the abutting portion 17 locally punches the core material 5 itself to form a small curved portion,
Formed by cutting and raising a part of the core material 5,
The tip is formed as a weld or a build-up of the welding itself, is formed by a screw head by screwing a screw into the core material 5, or when the core material 5 is manufactured by casting or forging, etc. It was formed.

The contact portions 17 may be provided so as to cross the core material 5 in the front-rear direction, or may be provided in a scattered manner in the same direction. When the contact portion 17 is formed by bending the core material 5 itself, a recess corresponding to the contact portion 17 is formed on the surface of the core material 5 facing the pad body 4. Since such a recess enlarges the contact area between the core material 5 and the pad body 4, there is also a secondary effect that the bonding strength between the two becomes stronger.

The present invention is not limited to the above embodiment. For example, the hook portion 6 is not limited to the one bent in a U-turn shape, but may be one bent in an L-shape. Further, the hook portion 6 is not integrated with the core material 5 and is a separate member bent in an L-shape. It may be formed by welding or bolting to the core material 5. The bolt connecting portion 7 is a core material 5.
The nut 24 may be welded in a state of being matched with the bolt through hole 8 of the above, or the bolt may be welded in a protruding state from the core material 5 toward the track plate 2 so that the back side of the track plate 2 is not welded. The nut 24 may be screwed together.

It is preferable to insert a plug for preventing clogging of mud or stones into the nut loading hole 28 provided in the pad body 4. The nut loading hole 28 is
It can also be formed in a hole shape that penetrates between both side surfaces (front-back direction) of the pad body 4.

[0036]

As is apparent from the above description, in the elastic pad according to the present invention, the hook portion provided on the core member is engaged with one end portion in the width direction of the track plate so that the core member is overlaid on the track plate. In this case, a predetermined floating gap is formed between the face of the bolt connecting portion provided on the end of the core material on the side opposite to the hook portion and the face of the shoe connecting plate. When this is connected, the core material itself warps as the floating gap is eliminated.

Therefore, due to this warp, there is no room for rattling between the hook portion and the shoe plate, so that the elastic pad can be securely attached to the shoe plate even when subjected to traveling vibration, etc. It is possible to prevent not only the early wear of the hook portion but also the looseness and wear of the bolt connecting portion and the breakage of the bolt connecting portion. When maintaining a minute gap between the main body of the core and the ridges of the track,
There is an advantage that the core material can be allowed to elastically deform within a predetermined range, and accordingly, the traveling vibration can be absorbed and absorbed and the pad body can be prevented from being damaged.

If a structure in which a nut as a separate member is loaded at the time of mounting on the shoe plate as the bolt connecting portion of the core material is adopted, it is troublesome to weld the nut and the bolt to the core material, and shot blasting or adhesive treatment. There is an advantage that the pretreatment of can be eliminated. Also, in handling as an elastic pad,
It also has the advantage that the threads of the nuts and bolts are not damaged or bulky.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view showing a first embodiment of an elastic pad according to the present invention in an easy-to-understand manner at a stage in which it is being attached to a shoe plate of a metal crawler.

FIG. 2 is a front cross-sectional view showing, in an easy-to-understand manner, a state in which the work is advanced from the state of FIG.

FIG. 3 is a right side view corresponding to FIG.

FIG. 4 is a perspective view showing a structure around a hook portion in the elastic pad of the first embodiment in an easily understandable manner.

FIG. 5 is a perspective view showing a structure around a bolt connecting portion in the elastic pad of the first embodiment in an easily understandable manner.

FIG. 6 is a front view showing the elastic pad of the first embodiment.

FIG. 7 is a bottom view corresponding to FIG.

FIG. 8 is a front sectional view corresponding to FIG.

FIG. 9 is a front cross-sectional view showing the second embodiment of the elastic pad according to the present invention in an easy-to-understand manner at a stage in which the elastic pad is being attached to a shoe plate of a metal crawler.

[Explanation of symbols]

1 elastic pad 2 footwear 2a exterior 4 pad body 5 core material 6 Hook part 7 bolt connection 8 bolt through holes 10 Ridges 10a convex 12 Main body 13 Folding part 13a Overhanging edge (= contact portion 17) 17 Contact part 20 floating gap 23 Volts 24 nuts 25 minute gap 28 Nut loading hole 29 times stop

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B62D 55/28

Claims (7)

(57) [Claims] 1. An elastic pad to be mounted on the outer surface side of each track plate (2) with respect to a metal crawler in which a large number of metal track plates (2) are connected endlessly, wherein a pad body (4) made of an elastic material is used. And a core material (5) provided on the back surface side of the pad body (4), the core material (5)
When the hook portion (6) is engaged with one end of the track plate (2) in the width direction and is stacked on the track plate (2), the hook part (6) is
Abutting on the convex surface (10a) of the ridge (10) protruding from the outer surface (2a) of the shoe plate (2) in the vicinity of, and floating between the facing surfaces of the bolt connecting portion (7 ) and the shoe plate (2). An elastic pad for a metal crawler, which is provided with an abutting portion (17) capable of generating a gap (20). 2. An elastic pad mounted on the outer surface side of each track plate (2) with respect to a metal crawler in which a large number of metal track plates (2) are connected endlessly, wherein a pad body (4) made of an elastic material is used. And a core material (5) provided on the back surface side of the pad body (4 ).
Hook part that can be engaged with the track plate (2) at one end in the width direction
(6) is provided, and at the other end thereof, a bolt to the track plate (2)
A connecting portion (7) is provided, and a hook portion (6 ) is provided on the core material (5) in the width of the shoe plate (2).
When it is engaged with one end in the direction and is stacked on the track (2),
From the outer surface (2a) of the track plate (2) near the hook (6)
Abutting on the convex surface (10a) of the protruding ridge (10),
Floating between the facing surfaces of the bolt connection part (7) and the track plate (2)
An elastic pad for a metal crawler, which is provided with an abutting portion (17) capable of generating a gap (20) . 3. A hook portion (6) of a core material (5) and a bolt connection.
The middle part of the connection part (7) is connected with the hook part (6) and the bolt connection.
Formed to project toward the ground plane side through the connecting part (7) and the step part
The elastic pad for a metal crawler according to claim 1 , wherein the elastic pad is for a metal crawler. 4. The core material (5) has a main body portion (12) positioned on the convex surface (10a) side of the ridge portion (10) when mounted on the track plate (2), and The main body (1
The hook portion (6) is provided via a bent portion (13) that goes backward from the protruding portion (10) toward the outer surface (2a) of the shoe plate (2) from the protruding portion (2). The abutting portion (17) is provided as an overhanging edge (13a) formed on a side edge portion of the bent portion (13), according to any one of claims 1 to 3. Elastic pad for metal crawler described. 5. The main body (12) of the core material (5) after the bolt connecting portion (7) is fastened to the shoe plate (2), and the contact plate (17), and the shoe plate. The elastic pad for a metal crawler according to claim 4, wherein a minute gap (25) can be formed between the convex surface (10a) of the protrusion (10) in (2). 6. The core member (5) for the bolt connecting portion (7).
Is formed by a bolt through hole (8) penetrating in the thickness direction. On the other hand, the pad main body (4) faces the pad main body (4) in the bolt through hole (8) from its peripheral side surface. The nut loading hole (2
8) is provided, The elastic pad for metal crawlers in any one of Claim 1 thru | or 5 characterized by the above-mentioned. 7. A bolt through hole (8) is provided in the core material (5).
7. The elastic pad for a metal crawler according to claim 6, further comprising a rotation stopping portion (29) for the nut (24).