JP2011207317A5 - - Google Patents

Description

Crawler travel device

  The present invention embeds a cored bar in a belt body made of a rubber material at a constant pitch in the circumferential direction of the belt, and a pair of left and right cores for rolling guide from the intermediate part in the belt width direction of each cored bar to the belt inner peripheral surface side The present invention relates to a crawler traveling device including a crawler belt provided with a gold protrusion and a drive sprocket that applies rotational power to the crawler belt in the belt circumferential direction.

  In this type of crawler travel device, a concave portion for engagement formed in a rubber belt main body portion between core bars embedded at a constant pitch in the circumferential direction of the crawler belt is longer in the belt width direction than in the belt circumferential direction. The drive sprocket that drives the crawler belt is provided with a drive claw body that is formed long in the same direction as the longitudinal direction of the recess for engagement. In other words, by increasing the contact area at the engagement location between the drive claw body and the engagement recess, a structure that allows a large drive force to be transmitted from the drive claw body side to the rubber belt body of the crawler belt. Is known (see Patent Document 1).

JP 2009-78796 A (paragraphs [0031], [0041], FIG. 1, FIG. 2, FIG. 3, FIG. 5, FIG. 6)

  In the above crawler traveling device, the driving claw body and the engaging crevice are formed by using a driving sprocket provided with an engaging recess formed long in the belt width direction of the crawler belt and a driving claw body formed long in the same direction. The contact area is increased. Thus, by increasing the contact area between the drive claw body and the engagement recess, the surface pressure from the drive claw body acting on the contact surface of the engagement recess formed on the rubber belt main body portion is reduced as much as possible. However, this structure has the following problems.

That is, in such a structure that transmits power by engaging a driving claw body formed long in the same direction as the longitudinal direction of the engaging recess with the engaging recess formed in the belt main body portion, The crawler belt and the drive sprocket are not provided with a function of suppressing the positional deviation in the belt width direction.
For this reason, when the left and right direction in the traveling direction of the airframe is an inclined road surface, the crawler belt and the drive sprocket are displaced in the belt width direction, and the engagement recesses and the drive claws formed in the belt main body portion. There may be situations where the body does not engage well.
In order to avoid this, for example, it is conceivable that the dimension of the engaging recess in the belt width direction is set to a sufficiently large size rather than the lateral width of the driving claw body to facilitate engagement. However, when the dimension in the belt width direction of the engaging recess is increased in this way, it is not stable at which position in the belt width direction the drive claw body is engaged in the engagement recess, and the drive claw body is eventually engaged. There is a problem that the strength of the crawler belt is reduced due to the presence of the engaging recess that becomes unnecessarily long in the belt width direction because it tends to come close to one end side of the recess.

  It is an object of the present invention to suppress the displacement of the crawler belt and the drive sprocket in the belt width direction so that the engagement recess of the crawler belt and the drive claw body of the drive sprocket can be easily engaged. It is an object of the present invention to provide a crawler traveling device that maintains a good meshing state between a body and a recess for engagement so that a driving force can be transmitted satisfactorily.

The technical means of the present invention taken in order to achieve the above object has the following structural features and operational effects.
[Solution 1]
The cored bar is embedded in the belt body made of rubber material at a constant pitch in the belt circumferential direction, and a pair of left and right cored bar projections for rolling guides project from the intermediate part in the belt width direction of each cored bar to the belt inner peripheral surface side. A crawler belt provided, and a drive sprocket that applies rotational power to the crawler belt in the belt circumferential direction,
The crawler belt has an engagement recess that engages with the drive claw of the drive sprocket on the inner peripheral surface side, and the engagement recess is located between the core bars in the belt circumferential direction ,
The drive sprocket, driving the outer circumferential side of the disk-shaped member that fits between the left and right core metal projections, you engaging enter the engaging recess formed in the crawler belt at predetermined intervals in the circumferential direction claw A crawler travel device with a body,
The disk-shaped member of the drive sprocket has a width in the left-right direction narrower than an interval between the inner ends of the left and right cored bar projections on the outer peripheral side that enters between the left and right cored bar projections, and is against the cored bar projections. A rib portion formed so as to come into contact with the inner end surface of the cored bar projection in accordance with a change in the relative position of the drive sprocket in the left-right direction over a predetermined amount;
On the outer peripheral surface side of the rib portion, a cutout portion is formed that allows mud adhering to the outer peripheral surface side to move inward in the radial direction from the outer peripheral surface. And

[Operation and effect of invention according to Solution 1]
Disc-shaped member of the drive motion sprocket on the outer peripheral side enters between the left and right core metal projections, narrower than the distance between the inner end side of the width left and right core metal projections in the lateral direction and with respect to the core metal projections A rib portion is provided so as to come into contact with the inner end surface of the cored bar projection in accordance with a change in the relative position of the drive sprocket in the left-right direction. Thus, the displacement of the driving sprocket side driving claw body and the crawler belt side engaging concave portion in the belt width direction is limited by the presence of the rib portion, and the engaging concave portion, the driving claw body, There is an advantage that it is possible to avoid a situation in which the belt is greatly displaced in the belt width direction and is not engaged.

As described above, the rib portion formed on the outer peripheral side of the disk-shaped member of the drive sprocket is useful in order to suppress the displacement between the drive claw body and the engagement recess. However, when a wide rib portion in the left-right direction is formed on the outer peripheral side of the disc-shaped member, between the driving claw bodies located on the outer peripheral surface side of the rib portion and the front and rear in the circumferential direction of the disc-shaped member, Adhesive mud on the road surface may adhere and be compressed by contact with the crawler belt, and may not easily fall off and accumulate.
As a result, the outer diameter of the disk-shaped member on the drive sprocket side is substantially increased, the amount of protrusion of the drive claw body toward the outer side is relatively reduced, and the engagement margin with the engagement recess is reduced. Therefore, when a large load is applied, the engagement between the drive claw body and the engagement recess may be disengaged and the drive force may not be transmitted.

In the present invention, the mud that adheres to the outer peripheral surface side of the rib portion is allowed to move to the inner side in the radial direction of the disk-shaped member from the outer peripheral surface of the rib portion. A notch is formed.
As a result, when the mud adhering to the outer peripheral surface side of the rib portion is sandwiched between the rib portion and the crawler belt and receives an action in the compression direction, the radius is larger than the outer peripheral surface of the rib portion via the notch portion. Since the adhering mud is pushed inward in the direction, it is avoided that mud adheres and accumulates on the outer peripheral surface of the rib portion, and the engagement between the driving claw body and the engaging concave portion is ensured, and the driving force is reduced. There is an advantage that it is possible to obtain a crawler traveling device in which transmission is performed well.

[Solution 2]
Another technical means of the present invention taken in order to solve the above-mentioned problem is that the engaging recess is located between the left and right core metal protrusions of the core metal arranged in parallel in the belt circumferential direction. Yes, the distance between the right end surface adjacent to the right core metal protrusion and the left end surface adjacent to the left core metal protrusion in the belt width direction is longer than the distance between the end surfaces in the belt circumferential direction,
The drive claw projects in the left-right direction of the disc-shaped member, and a right end surface that projects from the disc-shaped member to the right side in the left-right direction of the disc-shaped member and a left end that projects from the disc-shaped member to the left side The space | interval with a surface is formed longer than the space | interval of the end surfaces in the circumferential direction of the said disk shaped member.
[Solution 3]
Another technical means of the present invention taken in order to solve the above problems, notched portions formed in the outer peripheral surface of the rib portion positioned between the circumferential direction around the drive pawl of the circular board-shaped member In the outer peripheral surface, the outer peripheral surface is formed at a position closer to one side in the left-right direction so as to discharge mud to one side in the left-right direction of the rib portion.

[Operation and effect of invention according to Solution 3 ]
According to the configuration shown in the solution means 3 described above, the function of preventing the displacement between the engaging recess and the driving claw body by the rib portion is surely exhibited, and the function of discharging the adhered mud by the notch portion is also ensured. The mud can be discharged to one side of the left and right direction of the rib portion.
Therefore, if the discharge location in the left-right direction of the adhering mud by the notch is formed, for example, to be on the outer side in the machine traveling direction of the disk-shaped member, the mud discharged to the inner side of the disk-shaped member This is advantageous in that the amount can be reduced and adhesion of mud to various device parts on the traveling machine side can be easily avoided.

[Solution 4 ]
Another technical means of the present invention taken in order to solve the above problems, notched portions formed in the outer peripheral surface of the rib portion positioned between the circumferential direction around the drive pawl of the circular board-shaped member In the circumferential direction of the disc-shaped member, the disc-shaped member is provided alternately on the left and right sides of the one side and the other side in the left-right direction.

[Operations and effects of invention according to Solution 4 ]
According to the configuration shown in the solution means 4 described above, the function of preventing the displacement between the engaging recess and the driving claw body by the rib portion is surely exhibited, and the function of discharging the adhered mud by the notch portion is also ensured. It is possible to discharge mud to both sides in the left-right direction.

[Solution 5 ]
Another technical means of the present invention taken in order to solve the above problems, notched portions formed in the outer peripheral surface of the rib portion positioned between the circumferential direction around the drive pawl of the circular board-shaped member In the outer peripheral surface, the outer peripheral surface is formed on both sides in the left-right direction so as to discharge mud on both left and right sides of the rib portion.

[Operation and effect of invention according to Solution 5 ]
According to the configuration shown in the above solution 5 , the notch portions formed on the outer peripheral surface side of the rib portion are formed on both sides in the left-right direction of the outer peripheral surface of the rib portion located between the front and rear drive claws. As a result, it is possible to secure a large area in which the mud can be discharged on the outer peripheral surface side of the rib portion, and because the notch portions are present on both the left and right sides, the front and rear than the case where it exists only on one side. The movement distance of the mud until the mud adhering to each position on the outer peripheral surface of the rib portion between the drive claws reaches the notch can be shortened. Therefore, there is an advantage that the mud adhering to the outer peripheral surface of the rib portion can be easily discharged smoothly.

[Solution 6 ]
Another technical means of the present invention taken in order to solve the above problems, notched portions formed in the outer peripheral surface of the rib portion positioned between the circumferential direction around the drive pawl of the circular board-shaped member In other words, the disk-shaped member is formed at a distance from the drive claw body positioned in front of and behind the notch in the circumferential direction.

[Operations and Effects of Invention According to Solution 6 ]
According to the configuration shown in the solution means 6 described above, by leaving the rib portion by a predetermined interval at a position close to the drive claw body, the position difference between the drive sprocket and the crawler belt is caused by the remaining rib portion. It is easy to ensure the function of preventing the positional deviation between the engagement concave portion and the drive claw body by the rib portion while leaving the function to be regulated. In addition, there is an advantage that a decrease in the supporting strength of the driving claw body can be suppressed by the remaining rib portion.

It is the whole tractor side view. It is the whole crawler traveling device side view. It is a top view of a crawler belt. It is the IV-IV sectional view taken on the line in FIG. It is a fragmentary sectional view in the belt peripheral direction of a crawler belt. It is a schematic perspective view which shows a core metal protrusion part. It is a perspective view which shows a part of drive sprocket. It is a side view which shows the outer peripheral part of a drive sprocket. It is the IX-IX sectional view taken on the line in FIG. It is an arrow view in FIG. It is explanatory drawing which shows the relationship between a drive nail | claw body, the recessed part for engagement, and a metal core protrusion, (a) shows the state which a drive claw body is located in the edge part of the recessed part for engagement, (b) is a drive claw body. The rib part is in contact with the cored bar protrusion. It is explanatory drawing which shows the relationship between a drive nail | claw body, the recessed part for engagement, and a metal core protrusion. It is explanatory drawing which shows the relationship between the rib part of a drive sprocket, and a core metal protrusion. It is a side view which shows the engaging part of a drive sprocket and a crawler belt. It is a perspective view which shows a part of drive sprocket in another embodiment. It is a top view which shows a part of drive sprocket in another embodiment. A part of drive sprocket in another embodiment is shown, (a) is a perspective view and (b) is a bb line sectional view.

Hereinafter, an example of an embodiment of the present invention will be described based on the drawings.
[Overall structure of tractor]
FIG. 1 shows a semi-crawler type tractor provided with a crawler traveling device 2 according to the present invention on the rear side of the machine body. This semi-crawler type tractor is a four-wheel drive type tractor with a specification change to a semi-crawler type, and includes a pair of left and right front wheels 10 that can be steered at the front of the tractor with a cabin 1 and at the rear of the fuselage. The main propulsion device includes a pair of left and right crawler traveling devices 2. Further, the rear portion of the machine body is configured to connect a tilling device, a harvesting device, or various intermediate management working devices via a three-point link mechanism (not shown).

[Crawler traveling device]
As shown in FIGS. 1 and 2, the crawler travel device 2 includes a large-diameter drive spcket 3 connected to a rear axle 12 provided for driving rear wheels in a rear transmission case 11 of the tractor main unit 1. . The crawler belt 6 is wound around the drive sprocket 3, the idler wheels 4, 4 provided before and after the track frame 20, and a plurality of rollers 5 arranged in parallel in the longitudinal direction of the track frame 20. Thus, the drive sprocket 3 is provided at an intermediate position between the front and rear idler wheels 4 and 4 and at an upper position of the wheel 5.
The tread in the left-right direction of the crawler traveling device 2 is set to be substantially the same as the tread of the front wheel 10 in order to travel between the fences in the field.

As shown in FIG. 2, three rolling wheels 5 are arranged in parallel in the front-rear direction, and the foremost rolling wheel 5 is attached to a track frame 20 via a fixing bracket 21 in a fixed position.
The two wheels 5 and 5 on the rear side of the balance 5 are pivotally attached to the support bracket 22 attached to the track frame 20 so that the middle part thereof is swingable up and down around the horizontal axis x. The members 23 are arranged at both ends of the member 23 so as to be able to swing the seesaw.

Each of the rolling wheels 5 and the crawler belt 6 maintains a predetermined positional relationship in the belt lateral width direction, and a detachment prevention guide 7 for preventing the crawler belt 6 from coming off from the rolling wheels 5 has two lateral fulcrums. It is provided so that it can swing back and forth around p.
The front-side locking guide 7 is connected to the lower end side of the fixing bracket 21 that fixes and supports the frontmost roller 5, and the rear-side locking guide 7 is the last side of the balance-like member 23. It is continuously provided in a state extending before and after the wheel 5 at the end position.

[Crawler belt]
The crawler belt 6 is configured as shown in FIGS.
The crawler belt 6 has a core body 61 embedded in a belt body 60 formed in an endless belt shape with a rubber material at a constant pitch in the belt circumferential direction, and on the inner peripheral surface side of the belt between the core bars 61. An engaging recess 62 for engaging the driving claw body 31 of the driving sprocket 3 and transmitting power to the crawler belt 6 side is formed.

As shown in FIGS. 3, 5, and 11, the engaging recess 62 is located between the core bars 61 in the belt circumferential direction and is formed longer in the belt width direction than in the belt circumferential direction. ing. The end surfaces 62a on both ends of the engaging recess 62 in the belt width direction are not perpendicular to the horizontal plane when the crawler belt 6 is positioned on the horizontal plane as shown in FIG. And an inclined surface having a predetermined belt inclination angle β (corresponding to an inclination angle with respect to a horizontal plane).
The engaging recesses 62 in which the end surfaces 62a, which are inclined surfaces having the belt inclination angle β, are formed on both end sides in the belt width direction as described above are formed on the inner back side (the lower side in the figure) by the end surfaces 62a on both the left and right sides. ) Is formed on a tapered surface that becomes narrower.

  Further, the end surface of the engaging recess 62 in the belt circumferential direction is engaged with the front surface 31 b (an example of a contact surface) or the rear surface 31 c (an example of a contact surface) of the drive claw body 31 engaged with the engagement recess 62. In combination, a forward end face 62b and a rearward end face 62c as contact surfaces with the drive claw body 31 for transmitting the driving force of the drive sprocket 3 to the crawler belt 6 are configured.

As shown in FIGS. 3 and 4, each cored bar 61 is provided with a pair of left and right cored bar projections 63 for guiding a wheel from the intermediate part in the belt width direction toward the inner peripheral surface of the belt. The drive sprocket 3 and the front and rear idler wheels 4, 4 are configured to pass between the protrusions 63.
In addition, a flat roller raceway surface 64 on which the rolling wheels 5 roll is formed on the inner peripheral surface of the belt main body 60 located at the laterally outer side of each cored bar protrusion 63, and the outer peripheral surface of the belt main body 60. On the side, a propulsion lug 65 thicker than the thickness of the belt main body 60 excluding the cored bar projection 63 is integrally formed at a position overlapping the engaging recess 62 in the belt circumferential direction.

  On the inner peripheral surface side of the belt main body 60 between the core bar 61 and the engagement recess 62, as shown in FIGS. 3 to 6, the drive claw body of the drive sprocket 3 engaged in the engagement recess 62 A pressure receiving block 66 for transmitting the driving force of 31 to the cored bar 61 is provided. In other words, the rubber pressure receiving block portion 66 is configured to transmit a driving force to the metal core bar 61 while receiving a compression action by the metal driving claw body 31 entering the engaging recess 62. Yes, it is possible to avoid the occurrence of noise by avoiding direct contact between the metal of the driving claw body 31 and the cored bar 61.

As shown in FIGS. 4 to 6, the metal core protrusion 63 constitutes a belt main body 60 by a metal protrusion 61 a that is integrally formed with a part of the metal core 61 and protrudes toward the inner peripheral surface of the belt. The outer shape is formed substantially in a mountain shape by covering with a mountain-shaped protrusion 67 made of a rubber material.
That is, the core metal protrusion 63 is formed in a mountain shape in a sectional view both in the belt width direction shown in FIG. 4 and in the belt circumferential direction shown in FIG. As shown in FIG. 6, the surface facing the inner side of the core metal protrusion 63 in the belt width direction is formed by an inclined surface that serves as a guide surface C for the idler wheel 4 and the detachment prevention guide 7.
Further, the mountain-shaped cored bar projection 63 is formed in a T-shape in plan view with a top portion 63a of a portion along the belt circumferential direction and a portion directed inward so as to be orthogonal to the portion. The protrusion 67 is formed in a shape in which a recess 63 b is provided at a position located on the inner side in the belt width direction near the top 63 a on the guide surface C.

(Drive sprocket)
The drive sprocket 3 is configured as shown in FIGS. 2 and 7 to 12.
That is, a large-diameter disk-shaped member 30 connected to the rear axle 12 and a plurality of drive claws 31 provided so as to protrude outward in the radial direction from the outer peripheral edge of the disk-shaped member 30 are provided. It is configured.

  The disk-shaped member 30 includes a hub plate 13 fixed to the rear axle 12 as a drive shaft, and an annular outer peripheral member 14 (corresponding to an outer peripheral side portion) bolted to the outer peripheral side of the hub plate 13. The outer peripheral member 14 is configured by a combination of partial arc-shaped divided arc-shaped members 14a, 14b, and 14c that are equally divided into three in the circumferential direction.

As shown in FIGS. 7 to 10, the outer peripheral member 14 is thicker in the radial direction near the outer peripheral edge 16 than in the vicinity of the mounting portion 15 on the radially inner hub plate 13. In the vicinity of the outer peripheral edge 16, an annular rib portion 32 is formed.
The drive claw body 31 is integrally formed by projecting outward in the radial direction of the outer peripheral edge 16 of the outer peripheral member 14 and projecting outward in the left-right direction from the rib portion 32. It is.

The thickness d1 of the rib portion 32 in the left-right direction is formed to be narrower than the facing distance between the left and right core metal protrusions 63 of the crawler belt 6, and the core metal protrusion 63 and the drive claw body are formed. The correlation is set as follows.
That is, as shown in FIG. 11A, after the end surface 31a in the left-right direction of the drive claw body 31 contacts the end surface 62a of the engagement recess 62, the end surface 62a of the engagement recess 62 is driven by the drive claw body. When the pressing force of 31 is applied and the rib 32 is deformed by a certain amount of compression δ as shown in FIG. 11B, the edge 32 a of the rib portion 32 is formed on the inner end surface 63 c of the core metal protrusion 63. Get in touch.
Thus, after the end surface 31a in the left-right direction of the driving claw body 31 abuts on the end surface 62a of the engaging recess 62 and is elastically deformed to some extent, the rib portion corresponding to the end surface in the left-right direction of the disk-shaped member 30 is obtained. The left and right end edges 32 a of the ribs 32 are in contact with the inner end surface 63 c of the core metal protrusion 63. The position is set.

  That is, as shown in FIG. 11A, when a part of a surface where the end surface 31a in the left-right direction of the driving claw body 31 abuts the end surface 62a of the engaging recess 62 is a contact location P1 for convenience. As shown in FIG. 11B, a time lag is generated until the contact point P2 between the end edge 32a of the rib portion 32 and the inner end surface 63c of the cored bar projection 63 contacts. A relative left-right position between the end face 31 a in the left-right direction of the drive claw body 31 and the end edge 32 a in the left-right direction of the rib portion 32 is set.

That is, this positional relationship will be described with reference to FIG.
When the center position of the drive claw body 31 in the left-right direction is positioned on the center line CL of the engagement recess 62 in the belt width direction, the end face 31a in the left-right direction of the drive claw body 31 and the engagement recess The contact point P1 with the end surface 62a of 62 and the contact point P2 with the end edge 32a of the rib portion 32 and the surface 63c on the inner end side of the cored bar 63 are in a non-contact state.
At this time, of the contact location P1, the distance LP1-1 from the center line CL to the contact location P1 of the end surface 62a of the engagement recess 62, and the end surface in the left-right direction of the drive claw body 31 from the center line CL. The first gap LP1 exists between the distance LP1-2 to the contact point P1 of 31a.
Further, in the contact location P2, the distance LP2-1 from the center line CL to the contact location P2 of the inner end surface 63c of the cored bar 63, and the edge of the rib portion 32 from the center line CL. A second gap LP2 exists between the distance LP2-2 to the contact point P2 at 32a.
Then, the second gap LP2 is set larger than the first gap LP1 by an amount corresponding to the compression amount δ when the end face 62a of the engaging recess 62 is compressed and deformed by the pressing force of the driving claw body 31. Therefore, as described above, the end surface 62 a of the engaging recess 62 is compressed and deformed by the pressing force of the driving claw body 31, and the end edge 32 a of the rib portion 32 is the surface on the inner end side of the core metal protrusion 63. There is a time lag until the amount of movement necessary to contact 63c is reached.

[Driving claw body]
As shown in FIGS. 7 to 12, the drive claw body 31 projects in the lateral direction (left-right direction) perpendicular to the plate surface of the disk-shaped member 30, thereby causing the engagement recess 62 to extend in the belt width direction. The length is slightly shorter than that, and has the same length in the left-right direction as the length over both the left and right core metal protrusions 63.
As shown in FIGS. 9 and 11, the end surface 31a in the left-right direction of the driving claw body 31 is in a state in which the outer end edge of the driving claw body 31 is positioned on the horizontal plane. On the other hand, it is formed of an inclined surface having a predetermined claw inclination angle α (corresponding to an inclination angle with respect to a horizontal plane), not perpendicular to the surface.
End surfaces 31a, which are inclined surfaces having the claw inclination angle α, are formed on both left and right sides of the drive claw body 31, and the drive claw body 31 is located on the outer side in the radial direction by the end surfaces 31a on both the left and right sides. It is formed on a tapered surface that becomes narrow.
The claw inclination angle α is set to the same angle as the belt inclination angle β formed on the end surface 62a in the belt width direction of the engaging recess 62.

  A front-facing surface 31b (a surface on the side where the driving force is applied to the crawler belt 6 in the forward direction of the machine body) and a rearward surface 31c (a crawler belt 6 in the backward direction of the machine body) that are positioned forward and backward in the circumferential direction of the drive claw body 31. The surface on the side on which the driving force is applied) is generally in the direction along the normal to the rotation trajectory of the disk-shaped member 30, but the circumferential width d2 at the portion (base side) slightly closer to the rotation center side is less than the rotation center. The taper surface has a tapered shape that is wider than the circumferential width d3 of the outer side (nail tip side) that moves away, and is slightly narrower toward the radially outer side of the drive claw body 31.

The driving claw body 31 is configured to engage with the engaging recess 62 of the crawler belt 6 as shown in FIG. 14 in a side view to drive the crawler belt 6.
That is, the engagement points a1 to a9 shown in FIG. 14 indicate the meshing positions of the drive claw body 31 of the drive sprocket 3 that rotates counterclockwise and the engagement recess 62 in the drawing, and from the engagement point a1. However, on the upper side in the rotational direction of the drive sprocket 3, the drive claw body 31 of the drive sprocket 3 and the engaging recess 62 are not yet engaged with each other. On the lower side in the rotational direction of the drive sprocket 3 with respect to the engagement point a9, the engagement between the drive claw body 31 and the engagement recess 62 of the drive sprocket 3 is disengaged.
Thus, among the engagement points a1 to a9 shown in FIG. 14, the engagement point a1 is the engagement start point, and the engagement point a9 is the engagement end point. Among the engagement points a1 to a9, the pressing action of the drive claw body 31 on the engagement recess 62 is maximized at the engagement point a8. The relationship between the arrangement pitch of the drive claws 31 and the arrangement pitch of the engagement recesses 62 is determined.

[Rib part]
The rib portion 32 of the drive sprocket 3 will be further described in detail.
As shown in FIG. 7 to FIG. 9, the rib portions 32 provided on the outer peripheral portion of the disk-shaped member 30 of the drive sprocket 3 are each drive claw bodies 31 arranged at predetermined intervals in the circumferential direction of the drive sprocket 3. The outer peripheral surface located between the rib portions 32 is a mountain-shaped inclined surface 34 in which the center side in the left-right direction of the rib portion 32 is located on the radially outer side of the disk-shaped member 30 and both the left and right sides are located on the radially inner side. Is formed.
In this angled inclined surface 34, the outer peripheral edge 16 of the outer peripheral member 14 constituting the disk-shaped member 30 is located at the top of the angled shape.
The inclined surface 34 has a function as a reaction force receiver for mud compressed between the crawler belt 6 and the drive sprocket 3 being engaged with the crawler belt 6. When the mud existing between the surface 34 and the crawler belt 6 is subjected to a compression action, the mud is inclined so as to give a component force for escaping the mud outward in the left-right direction.

  As shown in FIGS. 11 and 12, the inclined surface 34 formed on the outer peripheral surface side of the rib portion 32 has an end edge 32 a of the rib portion 32 provided on the inner end surface of the core metal protrusion 63. It is formed on the outer side in the radial direction of the disc-like member 30 with respect to the contact point P2 that is present, and is configured so as to ensure a position regulating function by contact between the rib 32 and the core metal protrusion 63. is there.

  Further, notches 35 are alternately formed on the left and right sides of the inclined surfaces 34 located between the drive claws 31 in a part of the inclined surfaces 34 located between the drive claws 31. ing. By this cutout portion 35, mud soil on the side of the top portion of the inclined surface 34 that is the outer peripheral surface is passed through the cutout portion 35 in the left-right direction of the disk-like member 30. It is configured to be able to discharge radially inward on one side. The notches 35 are formed in a trapezoidal shape when viewed in the radial direction in which inclined surfaces 35A are formed on both sides of the drive sprocket 3 in the circumferential direction.

  The notch portion 35 here is for allowing the mud adhering to the outer peripheral surface side of the rib portion 32 to move inward in the radial direction from the outer peripheral surface. That is, a function as a reaction force receiver for mud soil compressed between the crawler belt 6 and the drive sprocket 3 engaged with the crawler belt 6 as in the inclined surface 34 described above is provided. Thus, it does not generate a component force that causes the mud to move in the left-right direction of the rib portion 32, and when the mud sandwiched between the rib portion 32 and the crawler belt 6 is compressed, A part cut out to form a space for discharging mud.

  The notch portion 35 formed in the rib portion 32 does not extend over the entire range of the rib portion 32 positioned between the front and rear drive claws 31 in the circumferential direction of the disk-like member 30, and is shown in FIG. As described above, the disk-shaped member 30 is formed with a gap S between the drive claw bodies 31 positioned in front of and behind the notch 35 in the circumferential direction. In this way, by leaving the gap S in the rib portion 32 at a position close to the drive claw body 31, the support strength of the drive claw body 31 by the rib portion 32 is improved and the remaining rib portion corresponding to the gap S is provided. By the contact of the end edge 32 in the left-right direction with the cored bar protrusion 63, it is possible to leave the effect of regulating the positional deviation between the drive sprocket 3 and the crawler belt 6.

[Other Embodiment 1]
In the embodiment, an example in which both the inclined surface 34 and the cutout portion 35 are provided on the outer peripheral surface side of the rib portion 32 is shown, but not limited to such a structure, for example, as shown in FIG. The rib part 32 formed on the flat surface may be provided with only the notch part 35. In FIG. 15, the notch portion 35 has a structure in which the rib portion 32 is alternately distributed to the left and right, but the notch portion 35 is provided only on one side in the left-right direction. Also good.

[Second embodiment]
The provision of the inclined surface 34 and the cutout portion 35 is not limited to the configuration in which the cutout portions 35 are alternately formed on either the left or right surface of the mountain-shaped inclined surface 34 as shown in the embodiment. As shown to (a), the inclined surface 34 is formed so that the one side in the left-right direction of the rib part 32 is located in the radial direction outer side of the disk-shaped member 30, and the other side is located in the radial direction inner side. The inclined surface 34 may be provided with notches 35 alternately on the left and right sides of the inclined surface 34.
In this embodiment, the cutout portions 35 are alternately formed on the inclined surface 34 at positions on the radially outer side of the disk-shaped member 30 and positions on the radially inner side of the disk-shaped member 30. However, the rib portions 32 between the drive claw bodies 31 positioned in the circumferential direction of the disk-like member 30 are alternately arranged, and the rib portions 32 between the drive claw bodies 31 are alternately arranged in the circumferential direction. It may be formed on the inclined surfaces 34 having different inclination directions so that the left and right alternate cutout portions 35 are all formed at positions on the radially inner side of the disk-shaped member 30.

[3 of another embodiment]
In providing the inclined surface 34 and the notch 35, as shown in the embodiment, the notch 35 is alternately formed on the left or right surface of the angled inclined surface 34 (FIG. 16A). (Refer to FIG. 16B).
That is, all the notches are formed on the inclined surface 34 formed such that one side of the rib portion 32 in the left-right direction is located on the radially outer side of the disk-shaped member 30 and the other side is located on the radially inner side. The portion 35 may be formed so as to be located on the radially outer side or the radially inner side of the disk-shaped member 30 of the inclined surface 34.

[4 of another embodiment]
The provision of the inclined surface 34 and the cutout portion 35 is not limited to the configuration in which the cutout portions 35 are alternately formed on either the left or right surface of the mountain-shaped inclined surface 34 as shown in the embodiment. As shown in (c), it may be provided on both the left and right sides of the angled inclined surface 34.
In this case, by providing the left and right cutout portions 35 with a slight displacement in the circumferential direction of the disk-shaped member 30, it is possible to avoid the lateral width of the rib portion 32 from becoming extremely narrow.

[5 of another embodiment]
When the inclined surface 34 or the cutout portion 35 is provided in the rib portion 32, the rib portion 32 may be configured as shown in FIGS. 17 (a) and 17 (b).
In the structure of this embodiment, on the outer peripheral surface side of the rib portion 32, one side in the circumferential direction of the disk-shaped member 30 is positioned on the radially outer side of the disk-shaped member 30, and the other side is positioned on the radially inner side. An inclined surface portion 34a formed so as to be formed, and subsequently to the inclined surface portion 34, one side in the circumferential direction of the disk-shaped member 30 is located on the radially inner side of the disk-shaped member 30, and the other side is in the radial direction. An inclined surface portion 34b formed so as to be located on the outer side, and one side of the rib portion 32 in the left-right direction is located on the radially outer side of the disk-shaped member 30, and the other side in the left-right direction is radially inward. A recessed portion that is also the inclined surface 34 and the notch 35 may be provided with the inclined surface portion 34c formed to be located on the side.

That is, in this recessed portion, in the portion close to the outer peripheral surface of the rib portion 32, that is, in the portion close to the radially outer side of the disk-shaped member 30, the crawler belt 6 on each of the inclined surface portions 34 a, 34 b, 34 c. Since there is a tendency to generate a component force that moves the mud sandwiched between and along the slope, a function as a so-called inclined surface 34 is provided.
In each of the inclined surface portions 34 a, 34 b, 34 c, the portion away from the outer peripheral surface of the rib portion 32, that is, the portion close to the radially inner side of the disk-shaped member 30, is between the crawler belt 6. The tendency to generate a component force that moves the mud by the inclined surface portions 34 a, 34 b, 34 c along the slope is lost, but the mud soil existing between the rib portion 32 and the crawler belt 6 is lost. Since it guides to push out the existing mud, the function as the notch 35 exists.

As described above, the inclined surface 34 and the cutout portion 35 may have a structure that acts in a state where their functions are combined.
As described above, when the recessed portion that is also the inclined surface 34 and the notch portion 35 is provided on the outer peripheral surface of the rib portion 32, as shown in FIG. The length is not limited to the one formed between the drive claw bodies 31 and 31 positioned at the front and rear in the circumferential direction and the distance between the drive claw bodies 31 and 31 positioned at the front and rear. The interval S may be eliminated. That is, of the inclined surface portions 34a, 34b, 34c, the front and rear inclined surface portions 34a, 34b may be formed from the base positions of the drive claws 31, 31.

[6 of another embodiment]
In the embodiment, an example in which the cutout portion 35 is formed in a trapezoidal shape when viewed in the radial direction is shown. However, as the shape of the cutout portion 35 when viewed in the radial direction, for example, different shapes such as a rectangular shape and a semicircular shape are used. May be adopted.

  The crawler traveling device of the present invention can be used as a propulsion device for various vehicles such as a combine and a construction machine in addition to the tractor shown in the embodiment.

2 Crawler Traveling Device 3 Drive Sprocket 6 Crawler Belt 30 Disc Member 31 Drive Claw Body 32 Rib Part 34 Inclined Surface 35 Notch 60 Belt Body 61 Core Bar 62 Engaging Recess 63 Core Bar Projection S Interval

Claims (6)

The cored bar is embedded in the belt body made of rubber material at a constant pitch in the belt circumferential direction, and a pair of left and right cored bar projections for rolling guides project from the intermediate part in the belt width direction of each cored bar to the belt inner peripheral surface side. A crawler belt provided, and a drive sprocket that applies rotational power to the crawler belt in the belt circumferential direction,
The crawler belt has an engagement recess that engages with the drive claw of the drive sprocket on the inner peripheral surface side, and the engagement recess is located between the core bars in the belt circumferential direction ,
The drive sprocket, driving the outer circumferential side of the disk-shaped member that fits between the left and right core metal projections, you engaging enter the engaging recess formed in the crawler belt at predetermined intervals in the circumferential direction claw A crawler travel device with a body,
The disk-shaped member of the drive sprocket has a width in the left-right direction narrower than an interval between the inner ends of the left and right cored bar projections on the outer peripheral side that enters between the left and right cored bar projections, and is against the cored bar projections. A rib portion formed so as to come into contact with the inner end surface of the cored bar projection in accordance with a change in the relative position of the drive sprocket in the left-right direction over a predetermined amount;
On the outer peripheral surface side of the rib portion, a cutout portion is formed that allows mud adhering to the outer peripheral surface side to move inward in the radial direction from the outer peripheral surface. Crawler travel device. The engaging recess is located between the left and right cored bar projections of the cored bar arranged side by side in the belt circumferential direction, and a right end surface adjacent to the right side cored bar projection in the belt width direction. The interval between the left end surface adjacent to the left metal core protrusion is formed longer than the interval between the end surfaces in the belt circumferential direction,
The drive claw projects in the left-right direction of the disc-shaped member, and a right end surface that projects from the disc-shaped member to the right side in the left-right direction of the disc-shaped member and a left end that projects from the disc-shaped member to the left side The crawler traveling device according to claim 1, wherein an interval between the surfaces is longer than an interval between end surfaces in a circumferential direction of the disk-shaped member . The notch portion formed on the outer peripheral surface side of the rib portion located between the front and rear drive claws in the circumferential direction of the disk-shaped member has mud on one side in the left-right direction of the rib portion on the outer peripheral surface. The crawler traveling device according to claim 1, wherein the crawler traveling device is formed at a location closer to one side in the left-right direction of the outer peripheral surface so as to be discharged . The notch formed on the outer peripheral surface side of the rib portion located between the front and rear drive claws in the circumferential direction of the disk-shaped member is the circumferential direction of the disk-shaped member and one side in the left-right direction of the disk-shaped member. The crawler traveling device according to claim 3, wherein the crawler traveling device is provided alternately on the left and right sides . The notch portion formed on the outer peripheral surface side of the rib portion located between the front and rear drive claws in the circumferential direction of the disk-shaped member is configured to discharge mud on both the left and right sides of the rib portion on the outer peripheral surface. The crawler traveling device according to claim 1, wherein the crawler traveling device is formed on both sides of the outer peripheral surface in the left-right direction . The notch formed on the outer peripheral surface side of the rib portion positioned between the front and rear drive claws in the circumferential direction of the disk-shaped member is a drive claw positioned before and after the notch in the circumferential direction of the disk-shaped member. The crawler traveling device according to any one of claims 1 to 5, wherein the crawler traveling device is formed at a distance from the body .