JP5643546B2 - Crawler travel device - Google Patents

Description

  The present invention embeds a cored bar in a belt body made of a rubber material at a constant pitch in the belt circumferential direction, and provides a cored bar projection for a wheel 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 that includes a crawler belt that protrudes 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 [0039], [0041], FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5)

  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 the above-described conventional structure, when a long claw belt formed in the width direction of the crawler belt is used as the driving claw body, the metal driving claw body protrudes toward the inner peripheral surface side of the crawler belt. The cored bar protruding part that protrudes to the inner peripheral surface side is integrally covered with the rubber material that constitutes the belt body of the crawler belt so that it can suppress the occurrence of noise by colliding with the manufactured metal bardling. .
Covering the cored bar protrusion with a rubber material in this way is effective in suppressing noise generation due to the contact between the drive claws and the metals, but in order to coat with the rubber material When molding the crawler belt, it is necessary to position and hold the core metal in the mold. In this conventional structure, the cored bar is positioned by grasping and holding a part of the cored bar body part of the cored bar embedded in the belt body.
For this reason, in the conventional structure, a portion not covered with the rubber material is generated in a part of the core metal body portion embedded in the belt body. This part is a part where mud and rainwater tend to accumulate, and if pebbles etc. enter here, the rubber material around the uncovered part will peel off from the core bar, or rust will spread on the surface of the core bar body , There is a risk of lowering durability.

An object of the present invention is to avoid contact between metals of a cored bar projection and a driving claw body in a crawler traveling device having a structure using an engagement recess formed in the belt width direction of the crawler belt and a driving claw body. A crawler traveling device that can hold the position of the cored bar without exposing the cored bar body part of the cored bar embedded in the belt body to the outside while covering the cored bar projection part with a rubber material It is to provide. Another object is to ensure good driving performance even if the position of the driving claw and the engaging recess in the belt width direction is slightly shifted, such as when the aircraft is traveling on an inclined ground. It is in.

  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]
According to the technical means of the present invention, as described in claim 1, the core metal is embedded in the belt body made of a rubber material at a constant pitch in the belt circumferential direction, and the belt inner periphery from the intermediate portion in the belt width direction of each core metal. A crawler traveling device comprising a crawler belt having a pair of left and right cored bar projections for guiding a wheel on the surface side, and a drive sprocket that imparts 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 of the crawler belt, and the engagement recess is located between the core bars in the belt circumferential direction and in the belt width direction. Then, it is formed in the range that spans the left and right cored bar projections,
The drive sprocket is engaged with an engagement recess formed on the crawler belt at a predetermined interval in the circumferential direction of the disk-shaped member on the outer peripheral side of the disk-shaped member fitted between the left and right cored bar protrusions. A drive claw body is provided, and the drive claw body is formed so as to protrude from the disk surface of the disk-shaped member to the range extending from the disk surface of the disk-shaped member to the location where the core metal protrusions are present on both sides in the belt width direction intersecting the disk surface of the disk-shaped member. ,
The portion of the core metal protrusion that protrudes toward the inner peripheral surface of the belt is covered with a series of rubber materials constituting the crawler belt, except for the vicinity of the top of the pair of left and right core metal protrusions facing each other in the belt width direction.
On the lateral outer side near the top of the core metal protrusion, a series of rubber materials constituting the crawler belt is not coated, or a recessed portion is formed which is coated thinner than other parts,
In the state where the end face in the left-right direction of the drive claw body is in contact with the end face of the recess for engagement, the recessed portion is provided at a position where it does not overlap the drive claw body as viewed in the belt circumferential direction. To do.

[Operation and effect of invention according to Solution 1]
According to the configuration shown in the above solution 1, the engagement concave portion that engages with the drive claw of the drive sprocket on the inner peripheral surface side of the crawler belt is located between the core bars in the belt circumferential direction, and the belt width In the direction, it is formed in a range extending between the left and right cored bar protrusions. The driving claw body is formed so as to protrude laterally from the disk surface in the belt width direction intersecting the disk surface of the disk-shaped member on the outer peripheral side of the disk-shaped member overlapping the movement locus of the core metal protrusion in a side view. ing.
Thus, by increasing the contact area in the belt width direction by increasing the contact surface in the engaged state between the engaging recess and the driving claw body, the surface pressure on the contact surface is widely dispersed in the belt width direction. be able to.

And the range excluding the vicinity of the top of the pair of left and right cored bar projections is covered by molding with a series of rubber materials constituting the crawler belt, and a series of rubber materials constituting the crawler belt near the tops of the cored bar projections Is provided with a recessed portion or convex portion that is not coated or thinner than other parts, so that the core embedded in the belt body is covered with a rubber material while most of the cored bar projection is covered with a rubber material. It is not necessary to provide a gripping part for positioning at the time of molding in the gold cored bar main body part, and the position of the cored bar can be held using this recessed part or convex part.
Therefore, the core metal main body portion embedded in the belt main body is free from the portion exposed from the belt main body, and the above-described adverse effects due to the core metal main body portion exposed from the belt main body can be avoided.

In addition, the recessed portion that is not covered with a series of rubber materials constituting the crawler belt or is thinner than other portions is near the top of the core metal protrusion, and laterally outward of the pair of left and right core metal protrusions It is formed in the place. Thus, the operation | movement and effect by the location where the said recessed part is provided are not the lateral inward side of a pair of left and right cored bar protrusions but a lateral outward side location are as follows.
That is, when the crawler traveling device travels on an inclined ground, the drive claw body may be driven in a state of being shifted downwardly from the center position in the left-right direction of the engaging recess (see FIG. 19). ). At this time, when the recessed portion is formed at a position on the laterally inner side of the cored bar projection, when the driving claw body is to be engaged with the engaging concave portion, the edge on the inclined upper side of the driving claw body is There is a case where the recessed portion formed in the laterally inner side portion of the core metal projection is inclined and lower than the surface facing the inner side of the core metal projection and is caught in the recessed portion.
As a result, there is a risk that the drive claw body cannot smoothly enter the engagement recess side or the drive claw body may be prevented from shifting to the inclined upper side. There is no.
In other words, when the grip portion is formed on the laterally outer side of the mandrel protrusion, the drive claw body is inclined more than the center position in the left-right direction of the engaging recess when the crawler traveling device travels on an inclined ground. Even if it is driven in a state where it is displaced downward, the drive claw body always includes the part where the recessed portion of the cored bar protrusion is not formed, either on the inclined lower side or the inclined upper side. It exists in the position which opposes a direction (refer FIG. 18).
Therefore, it is possible to avoid the occurrence of a situation where the edge on the upper side of the tilt of the drive claw as described above is caught by the gripping portion, and the relationship between the drive claw and the engagement recess is made regardless of whether or not the vehicle is traveling on an inclined ground. There is an advantage that good driving performance can be ensured by performing the joint operation smoothly.

In addition, since the recessed portion is formed at the laterally outer side portion of the pair of left and right cored bar projections as described above, the laterally inner surface of each cored bar projection is a function for regulating the original position of the cored bar projection. Can be formed into an arbitrary shape that can be effectively exhibited.
Therefore, the side inner side surface of the cored bar projection can be used as a proximity restricting part with the locking guide, or a wide contact surface can be formed, or a wide contact surface with the drive sprocket or idle wheel can be secured to ensure durability of the cored bar projection. For example, there is an advantage that the function of the inner side surface of the cored bar projection can be improved.
[Solution 2]
Further, in the above configuration, the drive sprocket has the drive claw body at predetermined intervals in the circumferential direction on the outer peripheral side of the disk-shaped member fitted between the left and right cored bar projections, and the disk-shaped member It is preferable to have a rib portion at the outer peripheral portion on the outer side in the radial direction.

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. A core metal is shown, (a) is a top view, (b) is a front view, and (c) is a side view. 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 explanatory drawing which shows the action state in the recessed part for engagement by a drive nail | claw body. The relationship between the driving claw body, the engaging recess and the cored bar projection is shown, (a) is a cross-sectional view of the driving claw body, (b) is an explanatory view showing the movement locus of the driving claw body with respect to the engaging recess, (c). FIG. 5 is a plan view showing the positional relationship of the drive claw body with respect to the engaging recess. It is a schematic front view which shows the positional relationship of a drive nail | claw body, the recessed part for engagement, and a metal core protrusion. It is a schematic front view which shows the positional relationship of the drive nail | claw body in another embodiment, the recessed part for engagement, and a metal core protrusion. It is a schematic perspective view which shows the core metal protrusion part of another embodiment. It is a schematic perspective view which shows the core metal protrusion part of another embodiment. It is explanatory drawing which shows the proximity | contact regulation state with a metal core protrusion in the location provided with the lowermost end surface of a stopper guide, (a) is a reference | standard attitude | position, (b) shows a maximum proximity attitude | position.

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, 6, and 12, 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 faces 62a on both ends in the belt width direction of the engaging recess 62 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 7, 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. 5A to 5C, the core bar 61 is a plate-like member formed so that the thickness in the vicinity of the central portion is larger than the thickness on the end side in the left-right direction. The metal core body portion 61A and a pair of left and right protruding portions 61B that are erected upward in the vicinity of the central portion thereof are made of a metal material that is integrally formed.
The protruding portion 61B is integrally formed with a head portion 61b formed in a mountain shape so as to have substantially the same shape as the shape of the vicinity of the top portion of the core metal protrusion 63 of the crawler belt 6 on the upper side of the support portion 61a connected to the core metal body portion 61A. In order to prepare for this, a concave portion 63b is formed on the surface of the crown 61b facing the end in the left-right direction, that is, the surface facing the laterally outward side.

As shown in FIGS. 5A to 5C, the recessed portion 63b is formed in a shape that is slightly recessed in the left-right direction and the front-rear direction on the surface facing the laterally outer side of the top of the head 61b. It is.
The core 63 is supported by grasping the left and right and front and rear surfaces of the recessed portion 63b, and positioned in a state in which the misalignment of the core 61 in the vulcanization mold is prevented. The whole main body portion 61A and the range excluding the recessed portion 63b of the protruding portion 61B are covered with a rubber material integrated with the belt main body 60.

As shown in FIGS. 4 to 7, the metal core protrusion 63 constitutes a belt main body 60 by a metal protrusion 61 </ b> B 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. And as shown in FIG. 7, the surface which faces the inner side in the belt width direction of the core metal protrusion 63 is formed by an inclined surface which becomes the guide surface C for the idler wheel 4 and the anti-separation guide 7, and the guide surface. A laterally outward surface D facing away from C is provided.
Further, the mountain-shaped cored bar projection 63 is formed in a T-shape in plan view with a top portion 63a having a portion along the belt circumferential direction and a portion facing outward so as to be orthogonal to the portion. A pair of front and rear recessed portions 63b of the projecting portion 61B is present at a position located on the outer side in the belt width direction near the top portion 63a on the side opposite to the guide surface C of the projecting portion 67. . That is, the recessed portion 63 b is a laterally outward surface D opposite to the guide surface C of the cored bar projection 63, and is provided near the top of the laterally outward side portion of the cored bar projection 63.
In addition, by providing the recessed portions 63b at the outer positions on both the front and rear sides of the pair of left and right core metal projections 63 in this way so that they can be gripped at four locations, the core metal 61 can be stabilized stably without front / rear / left / right deviation. Easy to hold. Further, since the tops of the cored bar projections 63 are not thinned by connecting the recessed portions 63b at the outer positions on both the front and rear sides, the strength of the tops of the cored bar projections 63 is not easily lowered.

(Drive sprocket)
The drive sprocket 3 is configured as shown in FIGS. 2 and 8 to 13.
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. 8 to 11, 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. 12A, 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, the end surface 62a of the engaging recess 62 is the driving 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. 12B, the edge 32 a of the rib portion 32 is formed on the inner end surface 63 c of the cored bar 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. 12A, 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. 12B, 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 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. 8 to 13, 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. 10 and 12, the left and right end surface 31a of the drive claw body 31 is in a state where the outer end edge of the drive 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 drive claw body 31 is configured to engage with the engaging recess 62 of the crawler belt 6 as shown in FIG. 15 in a side view to drive the crawler belt 6.
That is, the engagement points a1 to a9 shown in FIG. 15 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. 15, 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.

(Bulging contact)
The front and rear surfaces 31b and 31c, which are located in the front and rear in the circumferential direction of the driving claw body 31, are respectively formed on the front and rear end surfaces 62b and 62c in the belt circumferential direction of the engaging recess 62 of the crawler belt 6. A bulging contact portion 33 is formed so as to face each other.
As shown in FIGS. 8, 9, 16, 17 (a) and 17 (c), the bulging contact portion 33 includes a forward end surface 62 b that is a contact surface of the engagement recess 62, and a rearward end surface. In the forward facing surface 31b and the rearward facing surface 31c facing the 62c, the forward end surfaces thereof in the engagement state with the engaging recess 62 in a portion corresponding to the space between the left and right core metal projections 63 in the belt width direction. 62b and a part that bulges toward the rearward end face 62c.

The bulging contact portion 33 has a forward end surface of the engaging recess 62 as compared to the forward surface 31b and the rear surface 31c along the imaginary line passing from the rotation center of the drive sprocket 3 to the claw tip of the drive claw body 31. The distance between the front-facing end surface 62b and the rear-facing end surface 62c of the recess 62 for engagement is shortened by bulging toward the side of the rear-facing end surface 62c.
The shape of the bulging portion of the bulging contact portion 33 in a side view is as shown in FIGS. 17A and 17B. The drive sprocket 3 has a tooth edge formed by an involute curve. It is formed so as to follow the shape of the tooth edge when formed with a gear, and has a movement locus along the outer shape of the cored bar projection 63.

  As described above, the forward-facing surface 31b and the rear-facing surface 31c other than the bulging contact portion 33 are formed as tapered tapered surfaces that are slightly narrower toward the radially outer side of the drive claw body 31. The tapered surface has a virtual line segment (a center to be described later) passing through the claw tip of the drive claw body 31 from the rotation center of the drive sprocket 3 rather than the tooth edge when the tooth edge of the drive sprocket 3 is formed with an involute curve. It corresponds to the surface of the shape displaced in the direction approaching (corresponding to the lines y1, y2).

As shown in FIG. 17C, the position of the bulging contact portion 33 in a plan view is a front end face 62b and a rear end face 62c at a portion corresponding to the space between the left and right core metal protrusions 63 in the belt width direction. And is located away from the engaging recess 62 in a portion corresponding to the outside in the belt width direction rather than between the left and right cored bar projections 63.
Therefore, even if the movement trajectory of the bulging contact portion 33 is rotated close to the outer shape of the core metal protrusion 63 in the side view as shown in FIG. ), The left and right cored bar protrusions 63 are disengaged in the belt width direction. Thereby, even if the movement locus of the bulging contact portion 33 slightly changes in the belt circumferential direction, the bulging contact portion 33 can be prevented from contacting the core metal protrusion 63.

As shown in FIG. 17A, the shape of the bulging contact portion 33 itself has a thickness so as to spread in the circumferential direction of the drive sprocket 3 on the base side from the claw tip side of the drive claw body 31 as shown in FIG. In a plan view, as shown in FIG. 17 (c), it is formed in a smooth trapezoidal shape in which the side away from the center of the drive claw body 31 in the circumferential direction of the drive sprocket 3 protrudes. ing.
Further, as shown in FIG. 12B, the bulging contact portion 33 has a rib portion 32 provided on the outer peripheral portion of the disk-shaped member 30 of the drive sprocket 3 on one of the core metal projections 63 in the left-right direction. Even in a state where the contact and the lateral movement are suppressed, the rib portion 32 is formed closer to the center so as not to contact the cored bar protrusion 63.

As shown by a solid line in FIG. 16, the driving claw body 31 has its forward facing surface 31b abutted against the forward facing end surface 62b of the engaging recess 62 and pressed toward the front side (left side in the figure) in the driving direction. The belt body 60 made of the elastic member is elastically deformed in a range corresponding to the region b as indicated by the oblique lines, and at the same time, the bulging contact portion 33 is elastic in the range corresponding to the region c as indicated by the latticed oblique lines. It is deformed.
At this time, the center position of the drive claw body 31 in the circumferential direction of the drive sprocket 3 is on the center line y1.

In the above structure, the elastic deformation amount of the belt main body 60 is the sum of the region b and the region c, but when the elastic deformation amount without the bulging contact portion 33 is shown in FIG. As shown in the figure by phantom lines.
In this case, since there is no bulging contact portion 33 that deforms the amount corresponding to the region c, the deformation corresponding to the region b, which is the amount deformed by the forward surface 31b, by the amount corresponding to the region c. Will increase the amount. For this reason, the drive nail | claw body 31 moves to the front side in the rotation direction of the drive sprocket 3 for a while rather than the area | region b shown by the continuous line in FIG. 16, and is located in the location shown with a virtual line. At this time, the center position of the drive claw body 31 in the rotation direction of the drive sprocket 3 is positioned on the front center line y2 in the rotation direction of the drive sprocket 3 with respect to the center line y1.
In other words, if the bulging contact portion 33 is present, the drive claw body 31 is located on the rear side of the front center line y2 in the rotational direction of the drive sprocket 3 as compared with the case where the bulge contact portion 33 is not present. Since it is close to the center line y1, it is returned to the center position side of the engaging recess 62 in the belt circumferential direction.

[Rib part]
The rib portion 32 of the drive sprocket 3 will be further described in detail.
As shown in FIGS. 8 to 11, 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 body 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 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.

  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 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, but 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. Thus, the circumferential direction space | interval S is formed in the circumferential direction of the disk-shaped member 30, and the drive nail | claw body 31 located before and behind the notch part 35 is formed.
Thus, by leaving the circumferential interval 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 space corresponding to the circumferential interval S is provided. When the edge of the rib portion 32 in the left-right direction is in contact with the cored bar protrusion 63, it is possible to leave an effect of restricting the displacement of the drive sprocket 3 and the crawler belt 6.

[Relationship between the position of the recessed portion and the movement of the driving claw body]
18 and 19, when the recessed portion 63 b is provided on the laterally outward face D side on the laterally outward side of the cored bar projection 63, and on the guide surface C side on the laterally inward side of the cored bar projection 63. The related operation state with the drive nail | claw body 31 is shown.
18 shows a case where the recessed portion 63b is provided on the laterally outward surface D side on the laterally outward side of the cored bar projection 63, and FIG. 19 shows a guide surface on the laterally inward side of the cored bar projection 63. The case where it is provided on the C side is shown.

As shown in FIG. 18, in the case where the recessed portion 63b is provided on the laterally outward surface D side on the laterally outward side of the cored bar projection 63, for example, when driving on a slope with a low left side in the drawing, The drive sprocket 3 may be driven in a state where the claw body 31 is in contact with the left end portion of the engaging recess 62 of the crawler belt 6.
The movement trajectories r1 and r2 of the driving claw body 31 at this time are in a state indicated by imaginary lines in the figure. In this state, the trajectory of the driving claw body 31 is guided to the top portion of the core metal protrusion 63 other than the portion where the recessed portion 63b is formed, regardless of the presence of the portion where the recessed portion 63b of the left and right core metal protrusions 63 is formed. As a result, the guide is smoothly guided to the engaging recess 62 side.

As shown in FIGS. 19 and 20, in the case where the recessed portion 63b is provided on the guide surface C side on the lateral inward side of the cored bar projection 63, for example, when driving on a slope with a low left side in the drawing, The drive sprocket 3 may be driven in a state where the claw body 31 is in contact with the left end portion of the engaging recess 62 of the crawler belt 6.
The movement trajectories r1 and r2 of the driving claw body 31 at this time are in a state indicated by imaginary lines in the figure. In this state, the locus r2 on the right end side of the drive claw body 31 may be located on the left side or the same as the surface f1 of the recessed portion 63b in the laterally inner direction.
When the driving claw body 31 moves from the upper side to the lower side in this state, the lower end of the driving claw body 31 is caught on the upward surface f2 of the recessed portion 63b, or it is difficult to move in the right direction by being caught on the laterally inner surface f1. In order to eliminate such a catch, the recessed portion 63
It is better to provide b on the laterally outward face D side.

FIG. 22 shows the related operation with the stopper guide 7 in the case where the recessed portion 63b is provided on the side of the laterally outward surface D.
The anti-separation guide 7 is formed in a recessed portion 76 formed by die-casting with the upper side open inside to reduce the overall weight, and is formed in a taber shape with the laterally outer surface extending upward.
The lateral width L1 of the contact portion in the belt lateral width direction of the slip-off preventing guide 7 is set to be larger than the lateral width L2 at the contact portion in the upper portion of the core metal projection 63 on the crawler belt 6 side, as shown in the figure. Furthermore, when the stopper guide 7 and the inner peripheral surface of the crawler belt 6 approach each other, the contact between the contact point of the stopper guide 7 and the contact point at the upper part of the core metal protrusion 63 further approaches. Is prevented, and the interval S2 can be secured so as to avoid contact between the two.
That is, the proximity regulation that prevents the lower edge of the stopper guide 7 from coming into contact with the inner peripheral surface side of the crawler belt 6 due to the contact portion of the portion having the lateral width L1 set in the stopper guide 7. Part A is configured.

  The slip-off preventing guide 7 has a reference posture shown in FIG. 22A (traveling posture in a state where all the rollers 5 are in contact with the roller raceway surface 64 and the crawler belt 6 receives an average pressure as a whole. ), The contact surface of the wheel 5 and the lower surface of the stopper guide 7 are provided so that a sufficiently large distance S1 is provided between the position that is the lowermost end of the stopper guide 7 and the inner peripheral surface of the crawler belt 6. The relative height position of is set.

However, as shown in FIG. 22 (b), in the maximum proximity posture (traveling posture in a state where concentrated thrust force is applied from below some of the wheels 5 by riding on a convex portion or the like), the crawler belt. 6 is partially compressed or bent, and the anti-separation guide 7 is in a state of relatively approaching the inner peripheral surface of the crawler belt 6.
At this time, the contact between the contact point of the stopper guide 7 and the contact point at the upper part of the core metal protrusion 63 prevents the further approach, and secures the interval S2 so as to avoid contact between the two. Can do.

Also in this case, since the recessed portion 63b is provided on the laterally outward surface D side of the cored bar projection 63, the proximity restricting portion A for the anti-separation guide 7 is formed on the guide surface C side, so that The contact area with the lateral side surface of the stop guide 7 can be ensured wider than when the recessed portion 63b is formed on the guide surface C side.
As described above, since the recessed portion 63b is provided on the side outwardly facing surface D side of the core metal protrusion 63, a wide contact surface is similarly secured to the rib portion 32 and the idler wheel 4 of the drive sprocket 3 as well. It is possible to increase the durability of the cored bar projection 63.

[Other Embodiment 1]
As shown in the embodiment, the shape of the recessed portion 63 b is not limited to the shape in which the recessed portion 63 b is formed on each of the front and rear sides of the cored bar projection 63, and is formed, for example, on the front and rear sides of the cored bar projection 63. The concave portion 63b is continuous in the front and rear, and the entire top surface of the laterally outward surface D of the cored bar projection 63 is shaped as a flat grip part 68, or not both sides in the front-rear direction of the cored bar projection 63, Arbitrary shapes are adopted as long as the cored bar 61 can be supported and positioned on the top side of the cored bar projection 63, such as by forming a recessed part 63b that opens laterally outward at an intermediate position in the front-rear direction. can do.

[Second embodiment]
The recessed portion 63b is not limited to the one provided on the laterally outward face D side of the cored bar projection 63, but may be provided on the inward guide face C side as shown in FIGS. Alternatively, the recessed portions 63b may be provided on both sides of the laterally outward surface D side and the inward guide surface C side.

[3 of another embodiment]
When forming a portion where the series of rubber materials constituting the crawler belt 6 are not coated near the tops of the pair of left and right cored bar protrusions 63 facing each other in the belt width direction, or are coated thinner than other portions. The configuration is not limited to the recessed portion 63b as shown in the embodiment, but may be configured as shown in FIG.
That is, the cored bar 61 is formed in the vicinity of the top part of the cored bar projection 63 whose outer shape is substantially mountain-shaped so that the convex part 63d rising so as to bulge upward from the outer shape of the mountain-shaped cored bar protrusion 63 is formed. The upper end shape of the top 61b of the protruding portion 61B is configured.
In this example, the convex portion 63d is provided on the laterally outward surface D side of the cored bar projection 63, but may be provided on the opposite guide surface C side, or on the laterally outward surface D side. You may provide not in C side but in the center part in the left-right direction of the metal core protrusion 63. FIG.
Further, the shape of the convex portion 63d may be appropriately formed according to a required function such as use as a gripping portion at the time of molding described above.

  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.

Reference Signs List 3 Drive sprocket 6 Crawler belt 30 Disc-shaped member 31 Drive claw body 32 Rib part 33 Swelling contact part 60 Belt body 61 Core metal 62 Engaging recess 63 Core metal projection 63b Recessed part 63d Convex part 68 Grasping part

Claims (2)

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 traveling device comprising 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 of the crawler belt, and the engagement recess is located between the core bars in the belt circumferential direction and in the belt width direction. Then, it is formed in the range that spans the left and right cored bar projections,
The drive sprocket is engaged with an engagement recess formed on the crawler belt at a predetermined interval in the circumferential direction of the disk-shaped member on the outer peripheral side of the disk-shaped member fitted between the left and right cored bar protrusions. A drive claw body is provided, and the drive claw body is formed so as to protrude from the disk surface of the disk-shaped member to the range extending from the disk surface of the disk-shaped member to the location where the core metal protrusions are present on the left and right sides. ,
The portion of the core metal protrusion that protrudes toward the inner peripheral surface of the belt is covered with a series of rubber materials constituting the crawler belt, except for the vicinity of the top of the pair of left and right core metal protrusions facing each other in the belt width direction.
On the lateral outer side near the top of the core metal protrusion, a series of rubber materials constituting the crawler belt is not coated, or a recessed portion is formed which is coated thinner than other parts,
In the state where the end face in the left-right direction of the drive claw body is in contact with the end face of the recess for engagement, the recessed portion is provided at a position where it does not overlap the drive claw body as viewed in the belt circumferential direction. Crawler travel device. The drive sprocket has the drive pawls at predetermined intervals in the circumferential direction on the outer peripheral side of the disc-like member fitted between the left and right cored bar projections, and outward in the radial direction of the disc-like member. The crawler travel device of Claim 1 which has a rib part in the outer peripheral part of .

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