JP2014213807A - Crawler travel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crawler travel device whose horse power can be easily increased.SOLUTION: A crawler travel device is provided with a drive sprocket 12 that drives a crawler belt 11 at a plurality of press portions 25 for driving that are formed in a line with a constant pitch in a circumferential direction extending outwardly from an outer peripheral edge, where a front idle wheel, a rear idle wheel and a plurality of track rollers 15 that guide the crawler belt 11 are respectively configured in outer trank roller types comprising left and right cycles 29 adjacent to left and right of each protruding portion 22 for driving that are formed in a line with a constant pitch in a circumferential direction at a lateral center side position of the inner peripheral surface in the crawler belt 11. Each protruding portion 22 for driving is composed of a plurality of core metal protrusions 21B of core metals 21 embedded in the crawler belt 11 and a covered portion 11B of the crawler belt 11 covering the core metal protrusions 21B.

Description

  The present invention includes a drive sprocket that drives a rubber crawler belt, a front idler that rotates and guides the crawler belt in front of the drive sprocket, and a crawler belt that rotates behind the drive sprocket. The present invention relates to a crawler traveling device including a rear idler for guiding and a plurality of wheels for rotating and guiding the crawler belt between the front idler and the rear idler.

  In the crawler traveling device as described above, a plurality of protrusions project at equal intervals in the circumferential direction on the inner peripheral surface of the crawler belt formed in an endless belt shape with a highly durable rubber material. There is one configured to rotate the crawler belt in the circumferential direction by rotationally driving the sprocket in a state where the engagement member of the drive sprocket (sprocket) is engaged with the protrusion (see, for example, Patent Document 1).

JP 2007-161124 A

  In recent years, in order to improve work efficiency, it has been desired to increase the crawler traveling device with high horsepower. However, in the above configuration, when the crawler traveling device is driven, the engagement member of the drive sprocket presses against the plurality of rubber protrusions provided on the crawler belt. For this reason, if the crawler traveling device has a high horsepower, there is a risk that the protrusions may be peeled off from the crawler belt due to insufficient strength of the respective protrusions, which makes it difficult to increase the crawler traveling device with high horsepower.

  An object of the present invention is to make it possible to easily increase the horsepower of the crawler traveling device.

The problem solving means of the present invention is:
A drive sprocket for driving a rubber crawler belt; a front idler for rotating and guiding the crawler belt at the front lower side of the drive sprocket; and a rear side for rotating and guiding the crawler belt at a lower rear side of the drive sprocket. An idler, and a plurality of rolling wheels for rotating and guiding the crawler belt between the front idler and the rear idler,
The crawler belt embeds a plurality of core bars at a constant pitch in the circumferential direction, and projects a plurality of driving bars projecting from the left and right central side portions of the inner peripheral surface of each of the plurality of core bars in the circumferential direction. Forming a protrusion,
The driving sprocket has a plurality of driving pressing portions protruding outward from an outer peripheral edge thereof aligned at a constant pitch in the circumferential direction, and the driving protruding portions are rotated around the crawler belt by the driving pressing portion. Configured to press in the moving direction,
Each of the front idler wheel, the rear idler wheel, and the plurality of rolling wheels is configured as an outer rotation wheel type including left and right wheel bodies adjacent to the left and right of the driving protrusion,
Each of the driving protrusions includes a cored bar projection of the cored bar which is formed so as to be adjacent to the left and right ring bodies at the left and right center side portions of the cored bar, and the crawler belt covering the cored bar projection. And a covering portion.

  According to this means, at the time of driving the crawler traveling device, each driving pressing portion of the driving sprocket presses each driving protruding portion constituted by the cored bar projection of the cored bar on the crawler belt and the covering part of the crawler belt. become.

  In other words, each driving protrusion of the crawler belt can be effectively reinforced by the core metal protrusion, which effectively eliminates the possibility of the protrusions being stripped from the crawler belt when driven by the high horsepower of the crawler traveling device. Can be prevented.

  Further, when driving the crawler traveling device, the cored bar projection of the cored bar embedded in the crawler belt receives a pressing action from each driving pressing part of the driving sprocket via the covering part of the crawler belt. The pressing force from the pressing unit can be efficiently transmitted to the crawler belt through the cored bar.

  In addition, each driving protrusion of the crawler belt is connected to the left and right ring bodies of the front and rear idlers and each wheel by means of the core metal projections of the core bars embedded in the crawler belt through the crawler belt covering portions covering them. By abutting, the positional deviation of the crawler belt in the left-right direction with respect to the front and rear idlers and the respective wheels is prevented.

  Thereby, for example, as compared with the case where each driving protrusion is made of only a rubber material, it is possible to more reliably prevent the positional deviation of the crawler belt in the left-right direction with respect to the front and rear idlers and each wheel. In addition, the hardness of the rubber material used for each driving protrusion is set to the hardness of the rubber material used for the belt body in order to obtain high durability, as in the case where each driving protrusion is composed of only a rubber material. It is not necessary to make it higher than that, and it is possible to eliminate the need for separate vulcanization to obtain the hardness difference.

  As a result, it is possible to easily increase the horsepower of the crawler traveling device while reducing costs and facilitating manufacturing, and to shift the position of the crawler belt in the left-right direction with respect to the front and rear idlers and each wheel. It can prevent more reliably.

As one of the means for making the present invention more suitable,
The crawler belt forms a recessed portion into which the driving pressing portion is engaged between driving driving portions on the inner peripheral surface side thereof.

  According to this means, when the crawler belt is driven by the driving force from the driving sprocket, each driving pressing portion of the driving sprocket is engaged with each recessed portion of the crawler belt, and each core bar embedded in the crawler belt. Get closer to the base.

  Accordingly, when the crawler traveling device is driven, each driving pressing portion of the driving sprocket presses not only each driving projection of the crawler belt but also the belt main body side of the crawler belt. Therefore, when the crawler traveling device is driven, the bending force acting on the base end portion of each driving protrusion in the crawler belt due to the pressing force from each driving pressing portion can be reduced.

  Further, it becomes easy to transmit the pressing force from each driving pressing portion to the base of each core bar embedded in the crawler belt, and accordingly, the driving force from the driving sprocket can be efficiently transmitted to the crawler belt.

  Therefore, it is easier to increase the horsepower of the crawler traveling device, and it is possible to improve the durability of each driving protrusion on the crawler belt.

As one of the means for making the present invention more suitable,
The metal core includes a pair of metal core protrusions adjacent to the left and right corresponding rings as the metal core protrusions.

  According to this means, for example, the crawler belt can be reduced in weight as compared with the case where each core metal protrusion is formed to have a wide left and right width over substantially the entire left and right width of the driving protrusion.

  Therefore, the propulsive force of the crawler traveling device can be improved by reducing the weight of the crawler belt.

It is a left view of the tractor provided with the crawler traveling device. It is a vertical rear view of the crawler traveling device. It is a vertical left side view of the drive part in a crawler traveling device. It is IV-IV sectional drawing in FIG. It is a vertical front view of the recessed part formation location in a crawler belt. It is a longitudinal front view of the drive protrusion part formation part in a crawler belt. It is a vertical front view of the drive part in the crawler traveling device which shows another embodiment of the position shift prevention structure of a crawler belt. It is a vertical front view of the crawler belt which shows another embodiment of the position shift prevention structure of a crawler belt. It is a vertical side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part in the ellipse long in the protrusion direction. It is a longitudinal side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part circularly. It is a vertical side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part in the substantially V shape. It is a vertical side view of the principal part which shows another embodiment which formed the shape in the left-right direction view of the drive press part in the substantially U shape. It is a longitudinal front view of the principal part which shows another embodiment which formed the recessed part in the left-right center location of the protrusion end side in the drive press part.

  Hereinafter, an embodiment in which a crawler traveling device according to the present invention is applied to a tractor that is an example of a work vehicle will be described with reference to the drawings as an example of an embodiment for carrying out the present invention.

  As shown in FIG. 1, the tractor illustrated in the present embodiment includes a driving portion 2 in the front half of the body frame 1, and a cabin 3 that forms a boarding space in the rear half of the body frame 1. And, by providing front and rear wheels 4 that can be driven and steerable on both left and right sides of the front side of the body frame 1, and by providing crawler travel devices 5 that can be driven on both right and left sides of the rear side of the body frame 1, It is configured as a four-wheel drive type.

  As shown in FIG. 2, the body frame 1 is configured with a transmission case (hereinafter referred to as a T / M case) 6 on the rear side. The T / M case 6 is equipped with a rear axle case 8 that supports left and right rear axles 7 extending from the inside of the T / M case 6 to the left and right sides on the left and right sides of the rear part.

  Although not shown, at the rear of the vehicle body frame 1 is a link mechanism that enables connection equipment for work devices such as a rotary tiller and a plow, and a hydraulic type that enables the work device to be lifted and lowered via the link mechanism. A lifting mechanism and a PTO shaft that allows the working power to be taken out from the working device when a driving working device such as a rotary tiller is connected to the rear portion of the body frame 1 are equipped.

  As shown in FIGS. 1 and 2, the left and right crawler traveling devices 5 include a front and rear track frame 10, a rubber crawler belt 11, a drive sprocket 12 that drives the crawler belt 11, and a front lower portion of the drive sprocket 12. A front idler 13 that pivotally guides the crawler belt 11, a rear idler 14 that pivotally guides the crawler belt 11 below the drive sprocket 12, and a crawler belt between the front idler 13 and the rear idler 14. The four rolling wheels 15 for rotating and guiding 11 are provided.

  The left and right track frames 10 are equipped with connecting members 16 extending from the front and rear intermediate portions toward the vehicle body frame 1. The connecting member 16 is connected to a support member 17 that is bolted to the rear axle case 8 via a left and right support shaft 18.

  As shown in FIGS. 1 to 3, the left and right crawler belts 11 include an endless belt-like belt body 19 made of a rubber material having a high hardness and a plurality of lugs 20 made of a rubber material having a hardness lower than that of the belt body 19. It is molded as follows. In the belt body 19, a plurality of core bars 21 are embedded at a constant pitch in the circumferential direction, and a plurality of driving protrusions 22 projecting at the left and right central side portions of the inner peripheral surface are provided on each of the core bars 21. It is aligned and formed at a constant pitch in the circumferential direction so as to be located at the same position as the buried portion.

  The left and right drive sprockets 12 are made of a large-diameter rotating disk 23 that is bolted to the corresponding rear axle 7 and four divided sprockets 24 that are bolted to the outer periphery of the rotating disk 23 in a ring shape. It is composed by. Each split sprocket 24 is formed so as to have a plate-like connecting portion 24A that enables bolt connection to the rotating disk 23 and a plurality of protruding portions 24B that protrude outward from the outer peripheral edge of the connecting portion 24A. . And each protrusion part 24B is comprised so that the cross-sectional shape of a protrusion part formation location may become a T shape by forming in the width | variety which protrudes right and left from the connection part 24A. When the drive sprocket 12 is configured, the protrusions 24B are arranged in the circumferential direction of the drive sprocket 12 at a constant pitch that can enter between the two adjacent drive protrusions 22 in the crawler belt 11. Arrangement is set so as to be in a state. Then, as the drive sprocket 12 is driven to rotate, the crawler belt 11 is configured to rotate in the direction of rotation of the drive sprocket 12 by pressing the drive protrusion 22 located on the upper side in the rotation direction. Yes.

  That is, the left and right drive sprockets 12 are aligned at a constant pitch in the circumferential direction of the drive sprocket 12 with the plurality of protrusions 24B formed on each split sprocket 24 protruding outward from the outer peripheral edge of the drive sprocket 12. A plurality of driving pressing portions 25 that are in the above state are configured. These driving pressing portions 25 are configured to press the driving protrusions 22 of the crawler belt 11 in the rotational direction of the driving sprocket 12 as the driving sprocket 12 rotates.

  With this configuration, when the left and right drive sprockets 12 are rotationally driven in the forward direction together with the left and right rear axles 7, the drive pressing portions 25 of the left and right drive sprockets 12 correspond to the respective crawler belts 11 corresponding thereto. The drive protrusion 22 is pressed in the forward direction. Thereby, the left and right crawler belts 11 can be rotated in the forward direction, and the vehicle body can be advanced. Conversely, when the left and right drive sprockets 12 are driven to rotate in the reverse direction together with the left and right rear axles 7, the drive pressing portions 25 of the left and right drive sprockets 12 are associated with the corresponding drive crawler belts 11. The protrusion 22 is pressed in the reverse direction. Thereby, the left and right crawler belts 11 can be rotated in the reverse direction, and the vehicle body can be moved backward.

  As shown in FIG. 1, the left and right front idlers 13 are mounted on the front end of the track frame 10 via an urging mechanism 26 that projects and urges the front idler 13 forward and downward. Is arranged. Further, it is configured as an abduction wheel type having left and right wheel bodies 27 adjacent to the left and right of each driving protrusion 22 formed on the crawler belt 11. With this configuration, the crawler belt 11 is maintained in a tension state, and displacement of the crawler belt 11 in the left-right direction with respect to the front idler wheel 13 is prevented.

  The left and right rear idlers 14 are arranged at the rear lower part of the drive sprocket 12 by being installed at the rear end of the track frame 10. In addition, by forming an abduction wheel type having left and right wheel bodies 28 adjacent to the left and right of each driving protrusion 22 formed on the crawler belt 11, the crawler belt 11 in the left-right direction with respect to the rear idler wheel 14 is configured. Misalignment is prevented.

  As shown in FIGS. 1 and 2, the left and right wheels 15 are arranged between the front idler wheel 13 and the rear idler wheel 14 by installing them at the lower part of the track frame 10 at a predetermined pitch in the front-rear direction. Yes. Further, by forming an outer roller type having left and right wheel bodies 29 adjacent to the left and right of each driving protrusion 22 formed on the crawler belt 11, the crawler belt 11 in the left-right direction with respect to each wheel 15. Misalignment is prevented.

  As shown in FIGS. 2 to 6, the left and right crawler belts 11 are recessed portions 11 </ b> A that allow engagement of the drive pressing portions 25 between the drive protrusions 22 on the inner peripheral surface side of the belt body 19. Is forming. Each recessed portion 11A has a trapezoidal shape with a wide bottom when viewed in the rotational direction of the crawler belt 11, and a narrow base with a narrow shape when viewed in the lateral direction of the crawler belt 11. It is formed to have a shape. Further, the depths of the recesses are set so that the bottom wall portions 11a overlap with each other when viewed in the rotation direction of the core metal body 21A of each core metal 21 embedded in the belt body 19 and the crawler belt 11. Yes. And it forms so that the protrusion end part 25a of each drive press part 25 may join to those bottom wall parts 11a. The left and right side wall portions 11b are in contact with the left and right side end portions 25b of the driving pressing portions 25, thereby preventing the crawler belt 11 from being displaced in the left-right direction with respect to the drive sprocket 12. It is formed to function as. Further, the front and rear wall portions 11c of the drive protrusions 22 form the proximal end portions of the front and rear wall surfaces 22A.

  In the left and right crawler belts 11, each core bar 21 includes a core metal body 21 </ b> A as a base part of the core metal 21 embedded in the belt body 19 in a left-right orientation, and left and right protrusions protruding from the left and right central side portions of the core metal body 21 </ b> A. The core metal projection 21B is provided. In a state where the core metal body 21 </ b> A is embedded in the belt body 19, the left and right core metal protrusions 21 </ b> B protrude from the inner peripheral surface of the belt body 19, and the front idler wheel 13, the rear idler wheel 14, and each rolling wheel 15. It is constituted so as to be adjacent to the corresponding left and right ring bodies 27 to 29 in each.

  Each driving protrusion 22 includes left and right core metal protrusions 21B provided on the core metal 21 and a covering portion 11B of the crawler belt 11 that covers the left and right core metal protrusions 21B. The crawler belt 11 is formed to have a substantially triangular shape when viewed in the left-right direction. Further, the protruding lengths of these members are set as much as possible within the range where they do not come into contact with the support portion of the urging mechanism 26 that supports the front idler wheel 14 and the support portions of the track frame 10 that supports the rear idler wheel 13 and each wheel 15. By making the length longer, it is possible to more reliably prevent the displacement of the crawler belt 11 in the left-right direction with respect to the front and rear idle wheels 13 and 14 and the wheel 15.

  Each covering portion 11 </ b> B is integrally formed with the belt body 19 using a rubber material having the same properties as the belt body 19 so as to have the same hardness as the belt body 19. As described above, the front idler wheel 13, the rear idler wheel 14, and the respective rolling wheels 15 are configured as outer ring wheels, so that the front and rear idlers 13, 14 and the respective rolling wheels are interposed between the left and right cored bar projections 21B. Since it is not necessary to form a space that allows passage of 15, it is configured to have an inter-projection portion 11 d that fills between the left and right cored bar projections 21 </ b> B. Thereby, each drive protrusion 22 is formed so that the shape of the crawler belt 11 viewed from the rotation direction in the portion protruding from the inner peripheral surface of the belt body 19 is substantially trapezoidal.

  In the left and right drive sprockets 12, each drive pressing portion 25 has a wide, tapered trapezoidal shape that allows the drive sprocket 12 to be inscribed in the recessed portions 11 </ b> A of the crawler belt 11 when viewed in the rotational direction. In addition, the shape when viewed in the left-right direction is a narrow and tapered trapezoidal shape that can be inscribed in each recessed portion 11A of the crawler belt 11. And it forms so that the trapezoidal press surface 25c which presses in the rotation direction of the crawler belt 11 with respect to each drive protrusion part 22 of the crawler belt 11 may be provided on both front and rear surfaces facing the rotation direction of the drive sprocket 12. doing. Each pressing surface 25c has a wide left and right width extending over the left and right core metal projections 21B in each driving protrusion 22.

  In the left and right crawler belts 11, the driving protrusions 22 are in contact with the base side of the front and rear wall surfaces 22 </ b> A continuously in the left and right width direction and the entire protruding direction of the pressing surface 25 c of each driving pressing part 25. It is formed to have a shape surface portion 22a. Thus, the front and rear wall surfaces 22A of each driving protrusion 22 function as pressed surfaces that receive and press the entire pressing surface 25c with respect to the pressing surface 25c of each driving pressing portion 25. It is composed.

  With the above configuration, when the left and right rear axles 7 and the left and right drive sprockets 12 are rotationally driven in the forward or backward direction, the drive protrusions 22 of the left and right crawler belts 11 have their front or rear wall surfaces 22A. In the state where there is no dead space in which the entire area of the front or rear pressing surface 25c in the driving pressing portions 25 of the left and right driving sprockets 12 is received by the base portion side surface portion 22a of the left and right driving sprockets 12, the driving pressing portions 25 crawler. The belt 11 is pressed in the rotating direction. As a result, the driving force from the left and right drive sprockets 12 can be efficiently transmitted to the left and right crawler belts 11, and the propulsive force by the left and right crawler traveling devices 5 can be increased. Further, it is possible to suppress the deformation of each driving protrusion 22 during heavy load towing work, and thereby each driving pressing portion 25 is smoothly placed in each recess 11A located between each driving protrusion 22. Can be enrolled in.

  Further, when each driving pressing portion 25 presses against the corresponding driving protruding portion 22, the protruding end portion 25 a of each driving pressing portion 25 is a core metal of each core metal 21 embedded in the belt body 19. The main body 21A and the crawler belt 11 are superposed when viewed in the rotational direction. Thereby, the pressing action by each driving pressing portion 25 can be exerted on the core metal main body 21 </ b> A of each core metal 21 embedded in the belt main body 19. As a result, the driving force from the left and right drive sprockets 12 can be transmitted to the left and right crawler belts 11 more efficiently, and the propulsive force by the left and right crawler traveling devices 5 can be further increased.

  Each of the driving protrusions 22 has left and right core metal protrusions 21 </ b> B protruding from a core metal 21 embedded in the belt main body 19, so that the belt main body 19 can be used as a rubber material used for each driving protrusion 22. The durability of each driving protrusion 22 can be improved while adopting the same hardness as that of the rubber material used for the above. As a result, the hardness of the rubber material used for each driving protrusion 22 is adopted for the belt main body 19 in order to obtain high durability, as in the case where each driving protrusion 22 is composed of only a rubber material, for example. It is not necessary to make it higher than the hardness of the rubber material to be made, and it is possible to eliminate the need for separate vulcanization for obtaining the hardness difference. As a result, it can be advantageous in reducing costs and facilitating manufacturing.

  Although illustration is omitted, in the left and right crawler belts 11, a plurality of reinforcing steel cords are embedded in the outer peripheral side portions of the core metal projections 21B in the belt main body 19.

  [Another embodiment]

[1] The left and right crawler travel devices 5 may be configured to be provided on the left and right of the front portion of a work vehicle such as a tractor instead of the left and right front wheels 4. Further, instead of the left and right front wheels 4 and the left and right rear wheels, it may be configured to be provided on the left and right sides of the work vehicle in a state extending before and after the work vehicle such as a tractor.

[2] The left and right crawler travel devices 5 may be configured as shown in FIGS. This configuration will be described in detail. In the left and right crawler travel devices 5, each crawler belt 11 protrudes between inter-protrusion portions 11d that fills the space between the pair of core metal protrusions 21B in the covering portion 11B of each driving protrusion 22. The length in the direction is shorter than the length in the protruding direction of the pair of cored bar projections 21B in a state corresponding to the length in the protruding direction of each driving pressing portion 25 in the driving sprocket 12. And it has comprised so that the recessed part 22B may be provided in the protrusion end part of the protrusion part 22 for a drive. Further, the drive sprocket 12 is formed in each divided sprocket 24 that forms the outer peripheral edge of the drive sprocket 12 so as to be wider than the connecting portion 24A and narrower than the protruding portion 24B. 11 is provided with a ring-shaped engaging portion 12A for preventing the position of 11 from shifting in the left-right direction.

  Accordingly, when the left and right crawler traveling devices 5 drive the crawler belt 11 by the driving force from the driving sprocket 12, the driving protrusions 22 of the crawler belt 11 are driven by their pressed surfaces 22A. The crawler belt 11 is prevented from being unnecessarily lengthened in the protruding direction of the interprotrusion portion 11d while obtaining a state in which the entire pressing surface 25c of each driving pressing portion 25 of the sprocket 12 is received. be able to. Thereby, the weight reduction and cost reduction of the crawler belt 11 in the left and right crawler traveling devices 5 can be achieved.

  Further, by providing a ring-shaped engaging portion 12A on the outer peripheral edge of the drive sprocket 12, each drive protrusion 22 obtained by preventing the interprotrusion portion 11d from becoming unnecessarily long in the crawler belt 11. By effectively utilizing the recessed portion 22B, the displacement of the crawler belt 11 in the left-right direction with respect to the drive sprocket 12 can be prevented.

  That is, instead of the configuration exemplified in the above embodiment, the recessed portion 11A into which the driving pressing portion 25 is engaged is formed between the driving protrusions on the inner peripheral surface side of the crawler belt 11, instead of this configuration. Even if the configuration exemplified in another embodiment is adopted, it is possible to prevent the positional displacement of the crawler belt 11 in the left-right direction with respect to the drive sprocket 12. Further, when the configuration exemplified in the above embodiment or the configuration exemplified in this other embodiment alone is not sufficient to prevent the positional deviation of the crawler belt 11, both of the configurations are adopted, so that the drive sprocket 12 is adopted. Therefore, it is possible to reliably prevent the crawler belt 11 from being displaced in the left-right direction.

  Further, when the configuration exemplified in this another embodiment is adopted, the protruding length of each driving pressing portion 25 in the drive sprocket 12 can be shortened, and the outer diameter of the drive sprocket 12 can be shortened accordingly. . As a result, the distance between the track frame 10 and the drive sprocket 12 can be increased, and the assembly of the crawler traveling device 5 can be improved.

[3] As the core metal protrusion 21B of each core metal 21, for example, a single core metal protrusion 21B having a wide left and right width over substantially the entire left and right width of each driving protrusion 22 may be formed.

[4] In each crawler belt 11, each recessed portion 11 </ b> A formed between each driving protrusion 22 on the inner peripheral surface side thereof has, for example, a bottom wall portion 11 a of the belt main body 19 of the crawler belt 11. The cores 21A and the crawler belt 11 embedded in each of the cores 21 may be shallowly set so as not to overlap when viewed in the rotational direction.

[5] The configuration of each drive sprocket 12 can be variously modified. For example, the drive sprocket 12 may include a rotating disk 23 and a divided sprocket 24 such as a three-divided shape or a five-divided shape.

[6] The shape of each driving pressing portion 25 in each driving sprocket 12 can be variously changed. For example, as shown in FIGS. 9 to 12, the shape of each driving pressing portion 25 in the left-right direction is an ellipse (see FIG. 9), a circle (see FIG. 10), a substantially V-shape (see FIG. 10) that is long in the protruding direction. 11), or each driving pressing portion 25 may be formed so as to be substantially U-shaped (see FIG. 12). Further, as shown in FIG. 13, each driving pressing portion 25 may be formed so as to have a recessed portion 25 d at the left and right central portion on the protruding end side of each driving pressing portion 25. Furthermore, although not shown in the drawings, each driving pressing portion 25 may be formed such that the left and right width of each driving pressing portion 25 is larger than the left and right width of each driving protrusion 22.

[7] The rear idler 14 may be mounted on the rear end of the track frame 10 via an urging mechanism 26 that urges the rear idler 14 rearward and downward.

[8] In the above embodiment, a configuration in which the four rolling wheels 15 are mounted on the left and right track frames 10 so as not to be displaced is exemplified. For example, the front two rolling wheels 15 and the rear two rolling wheels 15 are provided. May be mounted on the track frame 10 so as to be able to swing the balance via a balance arm, and each wheel 15 may have a function as a suspension. Further, the track frame 10 may be configured to include three or less or five or more wheels 15.

[9] The shape of the pressed surface 22A (surface portion 22a) formed on each driving protrusion 22 of the left and right crawler belts 11, and the pressing surface 25c formed on each driving pressing portion 25 of the left and right driving sprockets 12. The shape of can be variously changed. For example, each of the pressed surfaces 22A and each of the pressing surfaces 25c may be formed in a rectangular shape. Each pressed surface 22A preferably has a shape that receives and presses the entire area of each pressing surface 25c.

[10] In the left and right crawler belts 11, a rubber material having a hardness higher than that of the rubber material used for the belt main body 19 is adopted for each covering portion 11B, and the hardness of the covering portion 11B in each driving protrusion 22 is the belt. You may comprise so that it may become higher than the hardness of the main body 19. FIG.

  The crawler traveling device according to the present invention is applied to agricultural work machines such as tractors, combine harvesters, carrot harvesters, corn harvesters, riding rice transplanters, construction work machines such as backhoes and dozers, or transport vehicles. Can do.

DESCRIPTION OF SYMBOLS 11 Crawler belt 11A Recessed part 11B Covering part 12 Drive sprocket 13 Front side idle wheel 14 Rear side idler wheel 15 Rolling wheel 21 Core metal 21B Core metal protrusion 22 Drive protrusion 25 Drive pressing part 27 Ring body 28 Ring body 29 Ring body

Claims (3)

A driving sprocket for driving a rubber crawler belt; a front idler for rotating and guiding the crawler belt at a front lower side of the driving sprocket; and a rear side for rotating and guiding the crawler belt at a lower lower side of the driving sprocket. An idler, and a plurality of rolling wheels for rotating and guiding the crawler belt between the front idler and the rear idler,
The crawler belt embeds a plurality of core bars at a constant pitch in the circumferential direction, and projects a plurality of driving bars projecting from the left and right central side portions of the inner peripheral surface of each of the plurality of core bars in the circumferential direction. Forming a protrusion,
The driving sprocket has a plurality of driving pressing portions protruding outward from an outer peripheral edge thereof aligned at a constant pitch in the circumferential direction, and the driving protruding portions are rotated around the crawler belt by the driving pressing portion. Configured to press in the moving direction,
Each of the front idler wheel, the rear idler wheel, and the plurality of rolling wheels is configured as an outer rotation wheel type including left and right wheel bodies adjacent to the left and right of the driving protrusion,
Each of the driving protrusions includes a cored bar projection of the cored bar which is formed so as to be adjacent to the left and right ring bodies at the left and right center side portions of the cored bar, and the crawler belt covering the cored bar projection. The crawler travel device comprised from the coating | coated part.   The crawler traveling device according to claim 1, wherein the crawler belt has a recessed portion in which the driving pressing portion is engaged between driving driving portions on an inner peripheral surface side thereof.   The crawler traveling device according to claim 1, wherein the core metal includes a pair of core metal protrusions adjacent to left and right corresponding ring bodies as the core metal protrusions.

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