JP2008105487A - Rolling wheel of crawler type traveling body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily form such a rolling wheel, by excellently radiating heat of an outer peripheral part contacting with a rolling wheel passing surface to an external part. <P>SOLUTION: This crawler type rolling body 20 is formed by winding a crawler belt 22 in an endless belt shape between a driving wheel 21 and a driven wheel. The rolling wheel 10 of the crawler type traveling body 20 is rolled on the rolling wheel passing surface S arranged over its whole periphery on an inner peripheral surface of the crawler belt 22 to this crawler belt 22 in response to the sending movement of the crawler belt 22. An outer peripheral part 13 contacting with the rolling wheel passing surface S is formed of a rubber material, and a projection-shaped, a recess-shaped or recess-projection-shaped first heat radiating part 16 is formed on an outer peripheral surface of this outer peripheral part 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a roller of a crawler type traveling body mounted on a construction machine such as a hydraulic excavator or other crawler type vehicles.

As a crawler type traveling body of this type, a crawler belt is wound in an endless belt shape between a driving wheel and a driven wheel, and the crawler belt on the inner surface of the crawler belt is provided over the entire circumference. A configuration is known in which a roller wheel is provided that is rolled with respect to the crawler belt as the crawler belt is moved. Conventionally, in order to improve the riding comfort of the crawler type traveling body and to prevent wear and damage of the wheel passing surface, it has been known that the outer periphery of the wheel contacting the wheel passing surface is formed of a hard resin material. It has been.
However, in such a crawler type traveling body, the outer peripheral surface slides on the wheel passing surface in a state where a pressing force directed radially inward acts on the outer peripheral portion during traveling. The heat generated on the outer peripheral surface is accumulated in the outer peripheral portion and tends to be deteriorated, which may shorten the life of the wheel.
Therefore, as a means for improving the heat dissipation of the rolling wheels, for example, as shown in Patent Document 1 below, a plurality of through holes extending in the axial direction may be formed in the outer peripheral portion at intervals in the circumferential direction. Proposed.
Japanese Utility Model Publication No. 04-56588

  However, in order to form such an outer peripheral portion, it is difficult to manufacture, for example, a mold must be designed in consideration of a draft taper. In addition, the through hole suppresses shortening of the life of the wheel. There was a possibility that heat dissipation could not be improved to the extent.

  The present invention has been made in consideration of such circumstances, and it is possible to dissipate the heat of the outer peripheral portion in contact with the wheel passing surface to the outside satisfactorily. It is an object of the present invention to provide a crawler type traveling wheel that can be formed.

In order to solve the above-described problems and achieve such an object, the roller of the crawler type traveling body of the present invention is a crawler in which a crawler belt is wound in an endless belt shape between a driving wheel and a driven wheel. In the crawler type traveling body, the crawler type traveling body is rolled with respect to the crawler belt as the crawler belt is moved on the roller passing surface provided on the inner circumferential surface of the crawler belt. An outer peripheral portion that is a wheel and is in contact with the wheel passing surface is formed of a rubber material, and a convex, concave, or uneven first heat radiating portion is formed on the outer peripheral surface of the outer peripheral portion. It is characterized by that.
According to the present invention, since the first heat radiating portion is formed on the outer peripheral surface of the outer peripheral portion, the surface area of the outer peripheral surface can be increased, and the first heat radiating portion is formed on the outer peripheral portion. Since it is formed not on the inner surface but on the outer peripheral surface, air can surely flow on the first heat dissipating part when the rolling wheels roll, and the heat of the outer peripheral part can be radiated well to the outside. Further, since the first heat radiating portion is formed not on the outer peripheral portion but on the outer peripheral surface in this way, it becomes possible to easily form the outer peripheral portion having the first heat radiating portion, and to improve heat dissipation. It is possible to suppress an increase in the manufacturing cost of the produced wheel. Further, since the outer peripheral portion of the wheel is formed of a rubber material, for example, stone or the like is caught between the outer peripheral surface of the outer peripheral portion and the wheel passing surface during the traveling of the crawler type traveling body, Even if a large impact force or pressing force is locally applied to the outer peripheral portion, the outer peripheral portion can be prevented from cracking.

Here, a bearing cylinder part into which the support shaft is inserted, a support cylinder part having a larger diameter than the bearing cylinder part and provided with the outer peripheral part on the outer peripheral surface, a bearing cylinder part and a support cylinder part A main body having a flange-shaped portion, and at least one of the outer peripheral surface of the bearing tube portion, the inner peripheral surface of the support tube portion, and the surface of the flange-shaped portion is convex, concave or irregular A second heat dissipating part may be formed.
In this case, since the second heat radiating portion is formed in the main body portion, it becomes possible to radiate the heat of the outer peripheral portion not only from the outer peripheral surface side but also from the interface side with the main body portion, The heat of the outer peripheral portion can be radiated to the outside more reliably. That is, of the heat generated on the outer peripheral surface of the outer peripheral portion during the traveling of the crawler type traveling body, when the heat accumulated in the outer peripheral portion without being radiated by the first heat radiating portion is conducted to the main body portion, this heat is 2 It is possible to radiate heat from the heat radiating part.

The second heat radiating portion may be a rib-like body connected across both the inner peripheral surface of the support cylinder portion and the surface of the flange-like portion.
In this case, during traveling of the crawler type traveling body, the portion away from the portion where the flange-shaped portion is connected in the support cylinder portion by the radially inward pressing force acting on the outer peripheral surface of the outer peripheral portion, When attempting to bend inward in the radial direction, the second heat dissipating portion of the rib-like body acts as a rib that resists this bending deformation. Therefore, it is possible to improve not only the heat dissipation of this roller wheel but also the rigidity, thereby further extending the life of the wheel.

  According to the present invention, it is possible to dissipate the heat of the outer peripheral portion in contact with the wheel passing surface to the outside satisfactorily, and such a wheel can be easily formed.

Hereinafter, a first embodiment of a roller wheel of a crawler type traveling body according to the present invention will be described with reference to FIGS. 1 and 2.
For example, in a construction machine such as a hydraulic excavator and other crawler type vehicles, a pair of left and right crawler type traveling bodies 20 mounted on the lower portion thereof are respectively composed of a drive wheel 21 and a driven wheel (not shown) as shown in FIG. A crawler belt 22 is wound around in an endless belt shape.
The drive wheel 21 is a sprocket and is rotatably supported by a drive means such as a hydraulic motor provided on the vehicle frame. The driven wheel is rotatably supported by the vehicle frame.

  The crawler belt 22 has a plurality of cores 24 embedded in a belt main body 23 formed of a rubber material in an endless belt shape at regular intervals in the belt circumferential direction, and is driven between the cores 24. A meshing hole 25 for the ring 21 is opened, and a pair of left and right cored bar projections 24a are projected toward the inner peripheral surface of the belt at the center in the belt width direction of each cored bar 24. The drive wheel 21 and the driven wheel pass through. Further, on the inner peripheral surface of the belt main body 23, a flat wheel passing surface S that continuously extends over the entire circumference is formed in a portion located on the outer side in the belt width direction with respect to the core metal protrusion 24a. A propulsion lug 26 projects from the outer peripheral surface of the main body 23. Further, in the belt main body 23, a steel cord layer 27 extending continuously in the circumferential direction is embedded in a portion of the core metal 24 on the outer peripheral surface side of the core metal 24 in the belt width direction outer side than the core metal protrusion 24a. Has been.

  A plurality of wheels 10 rotatably supported by the vehicle frame are provided between the drive wheels 21 and the driven wheels on the inner peripheral surface side of the crawler belt 22. The crawler belt 22 is caused to roll on the roller passing surface S as the crawler belt 22 is fed. Here, among the plurality of rollers 10, a part of the inner peripheral surface of the crawler belt 22 is arranged so as to support a portion located on the lower side of the ground side from the upper side, and the rest of the crawler belt 22 It arrange | positions so that the part located in an upper side in an internal peripheral surface may be supported from the lower side. The former roller 10 makes it possible to ground the lower portion of the outer peripheral surface of the crawler belt 22 over the entire region, and the latter roller 10 allows the upper portion of the crawler belt 22 to be located on the upper side. It can be held without sagging.

In the present embodiment, as shown in FIG. 2, the wheel 10 is formed of, for example, a cylindrical main body 12 made of a metal material and a rubber material, and on the wheel passing surface S. The outer peripheral part 13 which contacts is provided. The main body portion 12 includes a bearing tube portion 11 into which a support shaft (not shown) is inserted, and a support tube portion 14 having a larger diameter than the bearing tube portion 11 and provided with the outer peripheral portion 13 on the outer peripheral surface. And a flange-like portion 15 for connecting the support cylinder portion 14 and the bearing cylinder portion 11.
In the illustrated example, a disk-like flange-like portion 15 extending outward in the radial direction is connected to both end openings of the bearing tube portion 11. And the support cylinder part 14 is standingly arranged in the outer peripheral part of each flange-like part 15 toward the direction opposite to the side by which the bearing cylinder part 11 is arrange | positioned on both sides of this flange-like part 15. Moreover, the flange-shaped part 15, the support cylinder part 14, and the bearing cylinder part 11 are arrange | positioned coaxially.

Furthermore, in the present embodiment, a convex, concave, or uneven first heat radiating portion 16 is formed on the outer peripheral surface of the outer peripheral portion 13. In the illustrated example, the outer peripheral portion 13 is provided over the entire outer peripheral surface of the support cylinder portion 14, and the first heat radiating portion 16 continuously extends over the entire outer periphery of the outer peripheral portion 13. It is a circumferential groove. A plurality of the first heat radiating portions 16 are formed at regular intervals in the width direction of the outer peripheral portion 13.
Here, the width g of the first heat radiating portion 16 is, for example, larger than 10% and smaller than 50% of the pitch interval w of the first heat radiating portion 16. Further, the depth d of the first heat radiating portion 16 is, for example, larger than 10% of the thickness h of the outer peripheral portion 13 and smaller than 30%.

  In the present embodiment, in addition to the first heat radiating portion 16, a convex, concave or concavo-convex second heat radiating portion 17 is also formed on the main body portion 12 of the wheel 10. In the illustrated example, the second heat radiating portion 17 is a rib-like body connected across both the inner peripheral surface of the support cylinder portion 14 and the surface of the flange-like portion 15. That is, in the plate-like second heat radiating portion 17, the front and back surfaces extend along both the central axis direction and the radial direction of the wheel 10, and the inner peripheral surface and the flange-like portion of the support cylindrical portion 14. 15 are connected across both surfaces. A plurality of second heat radiating portions 17 are arranged at intervals in the circumferential direction of the wheel 10.

 The main body 12 having the bearing tube 11, the support tube 14, the flange-shaped portion 15, and the second heat radiating portion 17 is integrally formed. Furthermore, the wheel 10 configured as described above vulcanizes, for example, a molded product that is injection-molded by insert molding using the main body 12 as an insert product in the same cavity as the cavity at the time of injection molding. It can be formed by forming on the outer peripheral portion 13. Thus, when the outer peripheral part 13 is formed, the inner peripheral surface of this outer peripheral part 13 adhere | attaches on the outer peripheral surface of the support cylinder part 14, and the 1st thermal radiation part 16 is formed in the outer peripheral surface of the outer peripheral part 13.

 As described above, according to the roller 10 of the crawler type traveling body according to the present embodiment, the first heat radiating portion 16 is formed on the outer peripheral surface of the outer peripheral portion 13, so that the surface area of the outer peripheral surface is increased. In addition, since the first heat radiating portion 16 is formed not on the outer peripheral portion 13 but on the outer peripheral surface, air reliably flows on the first heat radiating portion 16 when the rolling wheels 10 roll. The heat of the outer peripheral portion 13 of the wheel 10 can be radiated well to the outside.

 Further, since the first heat radiating portion 16 is formed not on the outer peripheral portion 13 but on the outer peripheral surface as described above, the outer peripheral portion 13 having the first heat radiating portion 16 can be easily formed, and the heat radiating portion can be formed. An increase in the manufacturing cost of the wheel 10 with improved properties can be suppressed. Further, since the outer peripheral portion 13 of the wheel 10 is formed of a rubber material, for example, a stone or the like is caught between the outer peripheral surface of the outer peripheral portion 13 and the wheel passing surface S while the crawler type traveling body 20 is traveling. Even if a large impact force or pressing force is locally applied to the outer peripheral portion 13, the outer peripheral portion 13 can be prevented from cracking.

  In the present embodiment, in addition to the first heat radiating portion 16 formed on the outer peripheral surface of the outer peripheral portion 13, the main body portion 12 is also provided with the second heat radiating portion 17. It is possible to radiate heat not only from the outer peripheral surface side but also from the interface side with the main body portion 12, and the heat of the outer peripheral portion 13 can be radiated more reliably to the outside. That is, among the heat generated on the outer peripheral surface of the outer peripheral portion 13 during the traveling of the crawler type traveling body 20, the heat accumulated in the outer peripheral portion 13 without being radiated by the first heat radiating portion 16 is conducted to the main body portion 12. The heat can be radiated to the outside from the second heat radiating portion 17.

  Furthermore, in this embodiment, since the 2nd heat radiating part 17 is made into the rib-shaped body connected ranging over both the internal peripheral surface of the support cylinder part 14, and the surface of the flange-shaped part 15, it is a crawler type traveling body. During the travel of 20, the portion away from the portion where the flange-like portion 15 is connected in the support cylinder portion 14 due to the radially inward pressing force acting on the outer peripheral surface of the outer peripheral portion 13 is radially inward. When it is going to bend toward, the rib-like second heat radiating portion 17 can be made to act as a rib that resists this bending deformation. Therefore, it is possible to improve not only the heat dissipation of the wheel 10 but also the rigidity, and the life of the wheel 10 can be further extended.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the first heat radiating portion 16 is a groove portion continuously extending over the entire circumference of the outer peripheral portion 13, but instead of this, the groove portion extending in the width direction, or the width direction and Grooves extending in a direction inclined in both the circumferential directions may be employed, and furthermore, these groove parts may be appropriately combined. Moreover, although the concave groove part was shown as the 1st heat radiating part 16, it may replace with this and may employ | adopt a convex-shaped or uneven | corrugated 1st heat radiating part, for example. As this 1st heat radiating part, you may employ | adopt the rough surface part which enlarged the surface roughness by roughening the outer peripheral surface of the outer peripheral part 13, for example. The rough surface portion can be formed by appropriate means such as providing a minute uneven portion on the inner surface of the cavity used during vulcanization molding.

Moreover, it may replace with the 2nd thermal radiation part 17 of the said embodiment, and may employ | adopt a concave or uneven | corrugated 2nd thermal radiation part. For example, fins that protrude from at least one of the outer peripheral surface of the bearing tube portion 11, the inner peripheral surface of the support tube portion 14, and the surface of the flange-shaped portion 15 may be employed, or the outer periphery of the bearing tube portion 11 may be employed. A rough surface portion formed by subjecting at least one of the surface, the inner peripheral surface of the support tube portion 14 and the surface of the flange-shaped portion 15 to a rough surface treatment such as sandblasting may be employed. You may employ | adopt the groove part formed in at least one of the outer peripheral surface of the part 11, the inner peripheral surface of the support cylinder part 14, and the surface of the flange-shaped part 15. FIG.
Furthermore, instead of the second heat dissipating part 17 shown in the embodiment, for example, a rib-like body connected across both the inner peripheral surface of the support cylinder part 14 and the surface of the flange-like part 15 is provided on the roller 10. You may employ | adopt the structure extended over the perimeter. Further, the second heat radiating portion may not be provided in the main body portion 12.

Furthermore, in the said embodiment, although the structure which the bearing cylinder part 11, the support cylinder part 14, the flange-shaped part 15, and the 2nd heat radiating part 17 were formed integrally was shown instead of this, for example, each is another member. For example, it may be joined by welding or the like.
Moreover, in the said embodiment, the flat structure continuously extended over the perimeter to the part located in the belt width direction outer side rather than the core metal protrusion 24a in the inner peripheral surface of the belt main body 23 as the wheel passing surface S. However, instead of this, for example, the protruding end surface of a plurality of cored bar protrusions 24a arranged at intervals in the belt circumferential direction is covered with a rubber material integrally connected to the belt main body 23, and the protruding end surface The surface of the rubber material covering the roller may be used as a wheel passing surface. It should be noted that this wheel passing surface extends intermittently to the inner peripheral surface of the belt main body 23 over the entire circumference.

  Furthermore, in the above-described embodiment, the engagement hole 25 for the drive wheel 21 is formed in the belt main body 23. Instead of this, for example, a plurality of engagements are formed on the inner peripheral surface of the belt main body 23 at intervals in the circumferential direction. You may employ | adopt the crawler type traveling body which forms a protrusion and makes the engagement recessed part into which the tooth | gear of the sprocket in the drive wheel 21 inserts between these engagement protrusions. In such a crawler type traveling body, the wheel passing surface on which the wheel 10 is rolled may be a smooth surface located outside the meshing protrusion on the inner peripheral surface of the belt main body 23 in the belt width direction. In such a belt main body 23, a plurality of reinforcing ply layers may be embedded in the belt main body 23 instead of the cored bar 24.

  Further, instead of the main body portion 12 of the above-described embodiment, as shown in FIG. 3, the bearing tube portion 11 is coaxially disposed radially inward of the support tube portion 14, and the inner periphery of the support tube portion 14 is arranged. A main body portion 18 in which an axial center portion on the surface and an axial center portion on the outer peripheral surface of the bearing tube portion 11 are connected by a flange-like portion 15 may be employed. In the wheel 10 provided with such a main body 18, the wheel 10 can be separately attached and used on both sides in the central axis direction of the support shaft.

 It becomes possible to dissipate the heat of the outer peripheral portion in contact with the wheel passing surface to the outside satisfactorily, and such a wheel can be easily formed.

It is a perspective view including the partial cross section of the crawler type traveling body shown as one embodiment concerning the present invention. FIG. 2 is a longitudinal sectional view and a side view of a roller wheel of the crawler type traveling body shown in FIG. 1. It is a longitudinal cross-sectional view of the wheel of the crawler type traveling body shown as other embodiment concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rolling wheel 11 Bearing cylinder part 12, 18 Main body part 13 Outer peripheral part 14 Supporting cylinder part 15 Flange-shaped part 16 1st heat radiating part 17 2nd heat radiating part 20 Crawler type traveling body 21 Drive wheel 22 Crawler belt S Roller wheel passing surface

Claims (3)

In a crawler type traveling body in which a crawler belt is wound in an endless belt shape between a driving wheel and a driven wheel, the crawler belt on a roller passing surface provided on the entire inner circumference of the crawler belt. A crawler-type traveling body that is rolled with respect to the crawler belt in accordance with the feed movement of
A crawler characterized in that an outer peripheral portion that contacts the roller passing surface is formed of a rubber material, and a convex, concave, or irregular first heat radiating portion is formed on the outer peripheral surface of the outer peripheral portion. Type wheel. A wheel of a crawler type traveling body according to claim 1,
The bearing tube portion into which the support shaft is inserted, the support tube portion having a larger diameter than the bearing tube portion and provided with the outer periphery portion on the outer peripheral surface, and the bearing tube portion and the support tube portion are connected. A body portion having a flange-shaped portion,
A crawler characterized in that a convex, concave or concavo-convex second heat radiating portion is formed on at least one of the outer peripheral surface of the bearing tube portion, the inner peripheral surface of the support tube portion, and the surface of the flange-shaped portion. Type wheel. A crawler type traveling wheel according to claim 2,
The wheel of the crawler type traveling body, wherein the second heat radiating portion is a rib-like body connected across both the inner peripheral surface of the support cylinder portion and the surface of the flange-like portion.

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