JP2011251569A - Crawler traveling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a slip-off stopper guide, to avoid peeling of a rubber layer which is caused by slidably abutting of a lower edge of the slip-off stopper guide to an inner peripheral surface side of a rubber crawler, and to avoid deposition of a large amount of muddy soil on the slip-off stopper guide.SOLUTION: A downward surface 7B formed in a shape of a boat having a front end lower edge 77a inclined forwardly upwardly as going to a front part side and tapered in a front end side and outwardly extended as going to the backward upper side is provided on a lower surface side of a front part of the slip-off stopper guide 7 positioned between a right and left pair of core metal projections. An upward surface 7A formed in a shape of a roof having an upper edge 79 inclined backwardly upwardly as going to the rear part side and tapered in a front end side and outwardly extended as going to the backward lower side is provided on an upper surface side of the front part of the slip-off stopper guide 7.

Description

  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 inner peripheral surface of the belt. A crawler belt is provided with a gold protrusion, and a roller raceway surface on which a roller wheel rolls and moves on the inner peripheral surface of the belt body located on the laterally outer side of the core metal protrusion, and the belt circumference on the crawler belt. The present invention relates to a crawler traveling device including a drive sprocket that applies rotational power in a direction, an idler wheel that guides an inner peripheral surface side of the crawler belt, and the wheel.

In the crawler traveling device described above, in order to prevent the crawler belt from coming off, a slip-off preventing guide is provided between the pair of left and right cored bar projections. As a crawler traveling device provided with such a detachment prevention guide, the one described in [1] below is known.
[1] A locking guide in which an upper receiving plate having a wide width is integrally formed on an upper portion of a guide portion that is formed long in the front-rear direction so that both left and right ends protrude laterally from the guide portion When the crawler is pushed upward by riding on a protrusion or the like, the wide upper receiving plate comes into contact with the upper end of the core metal protrusion, and the guide portion becomes the engagement portion of the core metal. A structure configured to avoid contact (see Patent Document 1).

Utility Model Registration No. 2543716 (page 2, columns 4 to 5, FIGS. 1 and 2)

In the crawler traveling device described in the above [1], it is possible to prevent the belt from coming off due to the lateral displacement of the crawler belt by providing the coming-off prevention guide, but there are the following problems.
The pair of left and right cored bar projections of this crawler belt are integrally formed with the main body part of the cored bar embedded in the rubber crawler belt, and only the cored bar projected part is on the inner peripheral surface side of the crawler belt. It has a structure protruding to
For example, when this crawler belt rides on a protruding portion in a field and pushes the crawler belt from the lower side, the core metal protrusion protrudes at a place where the upper receiving plate having a wide lateral width of the detent guide exists. In such a case, the upper receiving plate is brought into contact with the top of the core metal projection to suppress the rise of the core metal projection, and a large vertical position change between the crawler belt and the stopper guide can be suppressed. However, in the case where the core metal protrusion is pushed up on the front side of the location where the upper receiving plate having a wide width of the stopper guide is present, there is nothing that regulates the rise of the top of the core metal protrusion, There is a possibility that the top part of the cored bar projection comes into contact with the front end edge of the upper receiving plate, resulting in damage to the cored bar projection or the upper receiving plate.
For this reason, it is necessary to extend the wide upper receiving plate on the side of the locking guide side to the front position so that the core metal protrusion does not push up, and the upper receiving plate itself has a strong strength. There is a problem that it becomes relatively heavy to secure, and the stopper guide tends to be heavy.

  An object of the present invention is to provide a crawler traveling device capable of reducing the weight of a slip-off prevention guide and preventing accumulation of a large amount of mud on the slip-off prevention guide.

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 main body made of a rubber material at a constant pitch in the belt circumferential direction, and the inner peripheral surface of the belt from the intermediate portion in the belt width direction of each core metal. A pair of left and right cored bar projections for guiding the wheel are provided on the side, and a roller raceway surface on which the wheels roll is formed on the inner peripheral surface of the belt body located on the laterally outer side of the cored bar projection. A crawler traveling device comprising a crawler belt, a drive sprocket that applies rotational power to the crawler belt in the belt circumferential direction, an idler wheel that guides the inner peripheral surface of the crawler belt, and the wheel. And
Located between the pair of left and right cored bar protrusions, and provided with a slip-off preventing guide for preventing the crawler belt from coming off,
On the lower surface side of the front portion of the anti-slip guide, the front end is provided with a lower front edge that rises forward toward the front side, the front end side is tapered, and a boat-shaped downward surface that extends outward toward the upper rear side,
On the upper surface side of the front portion of the anti-slip guide, a rear-upward upper edge is provided toward the rear side, and a roof-shaped upward surface that is tapered toward the front end side and outwards toward the rear lower side is provided. It is characterized by that.

[Operation and effect of invention according to Solution 1]
According to the configuration shown in the solving means 1, the anti-slip guide has a front end lower edge that is formed in a front-side upward shape on the lower surface side at the front side, and the front end side is tapered, and the rear upper side. It has a boat-shaped downward surface that spreads outwards, and on the upper surface side, it has a rear-upward upper edge on the rear side, a tapered shape on the front end side, and a roof-shaped upward surface that extends outwardly on the lower rear side I have.
Therefore, the boat-shaped downward surface existing on the lower surface side of the front portion of the slip prevention guide guides the mud on the front side to the lateral side, and suppresses the mud from climbing on the upper side of the slip prevention guide. On the upper surface side of the front part of the stop guide, because the roof-shaped upward surface exists, mud soil that has once climbed on the upward surface of the release guide is slid down while guiding it backward and downward. It is possible to avoid a large amount of mud from accumulating on the upper surface side of the front part.

  As a result, there is an advantage that it is possible to avoid a large amount of mud from accumulating on the slip-off prevention guide and to avoid a great amount of work for removing the mud.

[Solution 2]
According to another technical means of the present invention taken to solve the above-mentioned problem, as described in claim 2, the slip-off prevention guide is connected to the inner side surface of the cored bar projection by the contact of the slip-off guide. That is, a proximity restricting portion that prevents the lower edge from coming into contact with the inner peripheral surface side of the crawler belt is provided.

[Operation and effect of invention according to Solution 2]
According to the configuration described in Solution 2 above, the proximity regulating portion provided on the stopper guide itself is in contact with the inner side surface of the cored bar projection so that the lower edge of the stopper guide contacts the inner surface side of the crawler belt. Since it is constituted so as to prevent it from hitting, it is possible to avoid the slip-off preventing guide from sliding on the inner surface side of the crawler belt.
Therefore, when the crawler belt has a push-up action from the lower side, the lower edge of the stopper guide located between the core metal protrusions slides on the rubber layer covering the inner peripheral surface side of the core metal. In contact therewith, the rubber layer is not damaged early.
Further, the proximity restricting portion of the locking guide is formed so as to come into contact with the inner side surface of the core metal projection instead of at the top of the core metal projection, and is constituted by the lateral side portion of the locking guide itself. Therefore, a special member for constructing the proximity regulating portion is connected to the upper side of the locking guide, and the structure is such that proximity regulation is performed by contacting the top side of the core metal protrusion. In comparison, there is an advantage that the slip-off prevention guide can be easily formed into a small and lightweight one.

[Solution 3]
According to another technical means of the present invention taken to solve the above-mentioned problem, as described in claim 3, the detachment prevention guide is a recess that opens upward on the rear side of the portion having the roof-shaped upward surface. An entry space is provided, and a mud hole that communicates with the recess space is formed on the bottom surface side of the recess space at a position deviated in the front-rear direction from the lowest end surface of the stopper guide.

[Operation and effect of invention according to Solution 3]
According to the configuration shown in the above solution 3, the detachment prevention guide is further reduced in weight by providing an upwardly open recessed space on the rear side of the roof-shaped portion having the upward surface.
And the recessed space used for the weight reduction is provided in the rear side rather than the upward surface of the roof shape, so that the mud mud enters the recessed space on the upward surface of the roof shape. It can be suppressed by the mud sliding action. In addition, even if mud enters the recessed space, a mud hole is formed on the bottom side of the recessed space, so that the mud that has entered can be discharged to some extent through the mud hole, avoiding the accumulation of a large amount of mud. easy.
Further, since the mud hole formed on the bottom surface side of the recessed space is formed at a position deviated in the front-rear direction from the lowermost end surface of the anti-slip guide, the anti-detachment of the part where the mud hole is formed. A larger gap is formed between the lower surface of the guide and the inner peripheral surface of the crawler belt than between the lowermost end surface of the detachment prevention guide and the inner peripheral surface of the crawler belt.
Therefore, it is avoided that the inner peripheral surface of the crawler belt is too close to the outlet side of the mud hole to close the outlet, and the outlet is easily maintained in an open state so that mud is discharged well. easy.

[Solution 4]
According to another technical means of the present invention taken to solve the above-mentioned problem, as described in claim 4, the slip-off preventing guide has an upwardly open recessed space at a position overlapping the wheel in a side view. It is arranged so as to.

[Operations and effects of invention according to Solution 4]
According to the configuration shown in the solution means 4 above, the upwardly open recessed space provided in the slip-off prevention guide is located at a position overlapping the wheel in a side view, so during the turning operation in the crawler traveling device, The mud that tends to move from the lateral side of the machine body to the recessed space side is suppressed to some extent by the presence of the wheels, and it is easy to limit the entry of the mud into the recessed space. Further, even if mud enters the recessed space, the position is shielded by the rolling wheels in a side view, and it is easy to avoid the appearance of the mud from being deteriorated.

[Solution 5]
According to another technical means of the present invention taken to solve the above-mentioned problem, as described in claim 5, the rear end side of the upper edge of the rear rising shape on the upper surface side of the front portion of the locking guide is It is connected with the attaching part for attaching a comet stop guide to a track frame.

[Operation and effect of invention according to Solution 5]
According to the configuration shown in the solution means 5 described above, the rear end side of the upper edge of the rearward rising shape on the upper surface side of the front portion of the slip-off prevention guide is attached to the attachment portion for attaching the slip-off prevention guide to the track frame. By connecting, the upward surface provided with the upper edge of the back-up shape in the upper surface side of the front part of the said locking guide can be used effectively as a reinforcement means of the locking guide.
In other words, when the crawler traveling device rides on a protrusion in the field and a thrust force from the front lower side acts on the slip prevention guide, the tip side of the slip prevention guide may be deformed by the thrust force. However, in the present invention, since the upward surface provided with the upper edge of the rearward rising shape is used as the reinforcing means for the locking guide, the effect of suppressing the deformation of the locking guide tip side against the thrust force There is.

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 explanatory drawing which shows the contact state of an idler wheel and a crawler belt. 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. The slip prevention guide is shown, (a) is a plan view and (b) is a side view. 9A shows a slip-off prevention guide, FIG. 9A is an arrow view taken along line Xa-Xa in FIG. 9, FIG. 9B is an arrow view taken along line Xb-Xb in FIG. 9, and FIG. FIG. 10 is a cross-sectional view taken along the line -Xc, and FIG. The operational state of the related members with respect to the crawler belt is shown, (a) is an explanatory diagram showing the relationship with the drive sprocket, (b) is an explanatory diagram showing the relationship with the idler wheel, and (c) is the relationship with the slip-off preventing guide. It is explanatory drawing shown. It is explanatory drawing which shows the proximity | contact regulation state with a metal core protrusion near the attaching part of a slip-off prevention guide, (a) is a reference | standard attitude | position, (b) is the maximum proximity attitude | position. 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. It is.
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 rollers 5 and the crawler belt 6 maintains a predetermined positional relationship in the width direction of the belt and is provided with anti-separation guides 7 for preventing the crawler belt 6 from being detached from the rollers 5 at two front and rear positions. .
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.

Each cored bar 61 is provided with a pair of left and right cored bar projections 63 for guiding the wheel from the intermediate part in the belt width direction toward the inner peripheral surface of the belt. The idler wheels 4 and 4 are configured to pass through.
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, the driving force of the drive claw body 31 of the drive sprocket 3 engaged with the engagement recess 62 is transmitted to the core bar 61. For this purpose, a pressure receiving block 66 is provided. That is, the rubber pressure receiving block 66 is configured to transmit the driving force to the metal core 61 while receiving the compression action by the metal driving pawl 31 entering the engaging recess 62. Therefore, 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.

  Further, as shown in FIG. 5, the pressure receiving block portion 66 has an inner peripheral surface of the idler wheel 4 and the inner core 61 in the state where the idler wheel 4 is in contact with the inner peripheral surface side of the pressure receiving block portion 66. Projecting from the inner peripheral surface of the core metal 61 toward the inner peripheral surface of the belt so as to form a predetermined gap S3 for avoiding direct contact between the idler wheel 4 and the core metal 61 between the peripheral surface and the peripheral surface. Formed.

As shown in FIGS. 4 to 7, the core metal protrusion 63 constitutes a belt main body 60 by a metal protrusion portion 61 a that is integrally formed with a part of the core metal 61 and protrudes toward the belt inner peripheral surface. 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. 7, the surface facing the inner side of the core metal protrusion 63 in the belt width direction is formed by an inclined surface serving as a guide surface C for the idler wheel 4 and the anti-separation 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 line along the belt circumferential direction and a line directed outward so as to be orthogonal to the line. The protrusion 67 is formed in a shape in which a recess 63b is provided at a position located on the outer side in the belt width direction near the top 63a on the guide surface C.

(Drive sprocket)
The drive sprocket 3 is configured as shown in FIGS.
That is, a large-diameter disk-shaped member 30 connected to the rear axle 12 and a driving claw body 31 provided so as to protrude radially outward from the outer peripheral edge of the disk-shaped member 30 are configured. ing.
As shown in FIGS. 8 and 11A, the driving claw body 31 projects in the lateral direction with respect to the plate surface of the disk-shaped member 30 to thereby increase the length of the engagement concave portion 62 in the belt lateral width direction. It has the same width and is formed to have the same length as both the left and right cored bar protrusions 63.
The disc-shaped member 30 is formed to have a thickness in the belt width direction that is thinner than the opposing interval between the pair of left and right cored bar projections 63, and the disc-shaped member 30 is inserted between the left and right cored bar projections 63, 63. Is driven to rotate.

[Release prevention guide]
The detachment prevention guide 7 is configured as shown in FIGS. 2 and 9 to 13.
That is, it is continuously provided on the track frame 20 so as to be positioned between the left and right cored bar projections 63, 63 at the position where the front end wheel 5 and the rear end wheel 5 are provided. The detachment prevention guides 7 connected and fixed to the fixed bracket 21 and the balance-like member 23 connected to the support bracket 22 are the same in the front and rear.

As shown in FIG. 9, the detachment prevention guide 7 is formed in a boat shape as a whole in a side view, and the balance-like member 23 connected to the fixed bracket 21 or the support bracket 22 at two positions on the front and rear sides thereof. There are provided mounting portions 72, 72 having screw holes 71, 71 for connecting and fixing to.
In the mounting posture with respect to the fixed bracket 21 or the balance-like member 23, the position that is the lowermost end of the locking guide 7 is from the rotation center p of the wheel 5 as shown in FIGS. It is a position that intersects the perpendicular line y1. The lowermost position of the stopper guide 7 is in a state closest to the inner peripheral surface of the crawler belt 6 between the left and right core metal projections 63, 63. The width L1 of the side surface B, which is the contact position in the belt width direction at the position intersecting the perpendicular line y1, is the position where the center line y2 in the belt circumferential direction of the core metal protrusion 63 on the crawler belt 6 side exists. It is set to be larger than the lateral width L2 at the contact location at the top of the cored bar projection 63 (see FIGS. 12 and 13).

As shown in FIGS. 9A and 9B, the width L1 of the side face B, which is the contact position in the belt width direction of the slip prevention guide 7, is in the belt circumferential direction (front-rear direction) of the slip prevention guide 7. It is formed so that it is the same in the length range of the linear portion L3, and the front and rear ends of the locking guide 7 are located on the front side and the rear side of the linear portion L3 as shown in FIG. 9A. It is formed in a tapered shape in a plan view, and in a side view, as shown in FIG. 9B, it is formed in a shape in which front and rear ends are warped upward.
Further, in the linear portion L3 of the locking guide 7, near the portion intersecting the perpendicular line y1, as shown in FIG. 9 (b), the orthogonal lower edge portion 73 (bottommost) orthogonal to the perpendicular line y1. An orthogonal lower edge range L4 having an end face) is formed, and among the linear portions L3 before and after that, the front lower edge portion 74 in front of the orthogonal lower edge range L4 is formed in a slightly raised front shape. The rear lower edge portion 75 rearward from the orthogonal lower edge range L4 is formed in a slightly rearwardly raised shape.

  The reason why the lower edge guide 7 is formed in this way is as follows. That is, as shown in FIG. 2, when it is assumed that all the wheels 5 are located on a flat ground, the front end side and the rear end of the crawler traveling device 2 with respect to the lower tangent line to all the wheels 5. The lower edge of the side idler wheels 4, 4 is located higher. For this reason, the crawler belt 6 is stretched slightly forward on the front side of the frontmost roller 5 and slightly lifted on the rear side of the rearmost roller 5, so that This is to maintain a necessary gap between the lower edge of the stop guide 7 and the inner peripheral surface of the crawler belt 6.

As shown in FIGS. 9A and 9B, the detachment prevention guide 7 has a hollow space 76 formed by casting with the upper side opened between the front mounting portion 72 and the rear mounting portion 72. Is formed. The recessed space 76 is intended to reduce the material of the slip prevention guide 7 and reduce the overall weight, and is formed as large as possible within a range that does not impair the required strength of the slip prevention guide 7.
As shown in FIG. 9B, the recessed space 76 of the slip-off prevention guide 7 is attached to the front and rear in a state where the perpendicular line y1 from the rotation center p of the roller wheel 5 is located at a substantially central position in the front-rear direction. As shown in FIG. 2, the rolling wheels 5 that are formed between the portions 72 and 72 and are present in a range covering the front and rear mounting portions 72 and 72 of the locking guide 7 in the side view, The detachment prevention guide 7 is mounted on the track frame 20 in such a positional relationship that the space 76 overlaps the wheel 5.

On the bottom side of the recessed space 76, a mud remover communicating with the recessed space 76 at a position away from the orthogonal lower edge range L <b> 4 where the orthogonal lower edge portion 73 (corresponding to the lowermost end surface) exists. A hole 76a is formed.
The mud hole 76a formed at this position is slightly spaced from the inner peripheral surface of the crawler belt 6 even when the orthogonal lower edge portion 73 (corresponding to the lowermost end surface) is in contact with the inner peripheral surface of the crawler belt 6. It is configured so that the outlet side of the mud removal hole 76a is not blocked by the inner peripheral surface of the crawler belt 6 so as to be lifted up.
Actually, the presence of the proximity restricting portion A of the stopper guide 7 described later causes the orthogonal lower edge portion 73 (corresponding to the lowermost end surface) to be in contact with the inner peripheral surface of the crawler belt 6. Therefore, the distance between the outlet side of the mud hole 76a and the inner peripheral surface of the crawler belt 6 is maintained wider.

Further, the locking guide 7 is formed as shown in FIGS. 9A and 9B and FIGS. 10A to 10D.
That is, as shown in FIG. 9B, the downward surface 7B of the locking guide 7 on the front side of the front mounting portion 72 has a front end lower edge 77a that has a front rising shape in front view as viewed from the side. Of the side surface B of the stopper guide 7, the front end side surface portion 77b extends forward beyond the linear portion L3. Then, the front end side surface portion 77b spreads outward toward the rear upper side, and the downward facing surface 7B is formed in a boat shape by the front rising bottom edge 77a and the front end side surface portion 77b (see FIGS. 10A and 10B). c))).

  Further, as shown in FIGS. 9A and 9B, the upward surface 7A of the locking guide 7 on the front side of the front mounting portion 72 is provided with a flat and rear-falling upper surface 78a on the foremost side. Yes. Then, the upper surface 78b following the descending upper surface 78a is formed in a roof shape that includes an upper edge 79 that is rearwardly raised toward the rear side as viewed from the side, has a tapered front end, and extends outward toward the rear lower side. (See FIGS. 9A and 9B and FIGS. 10A and 10C).

The rear end of the upper edge 79 that rises rearward is integrally formed so as to be continuous with the front surface of the mounting portion 72, and the front end of the slip prevention guide 7 against an external force acting from the downward surface 7 </ b> B side of the slip prevention guide 7. It plays the role of reinforcing the side.
And, on the downward surface 7B side of the locking guide 7, the mud on the front side is guided and discharged laterally by the shape of a boat that extends outwardly upward, and on the upward surface 7A side of the locking guide 7. Then, the mud soil riding on the upward surface 7A is guided to slide down by the roof-shaped surface that spreads outward toward the lower rear side.

The recessed space 76 is formed between the front mounting portion 72 and the rear mounting portion 72 of the slip prevention guide 7. As shown in FIG. 10C, the cross-sectional shape at the location where the recessed space 76 exists is an upwardly open V-shape. This cross-sectional location is a cross-section at a position that intersects the perpendicular line y <b> 1 from the rotation center p of the wheel 5.
On the rear side of the portion where the recessed space 76 exists, the downward surface 7B of the locking guide 7 is provided with a rear edge lower edge 77c that rises rearward, and is an inclined surface that spreads outward toward the upper rear side, and the rear side is narrower. It is formed into a tapered shape.

  The reason why the front end side and the rear end side of the slip prevention guide 7 are tapered in plan view is that, as described above, the guide action by the slip prevention guide 7 having the wide width L1 in the belt width direction is smoothly performed. Because. Furthermore, as described above, the front and rear ends of the slip prevention guide 7 are formed in a shape that warps upward in addition to the tapered shape in plan view. This is in order to avoid direct contact.

  The anti-separation guide 7 configured as described above has a reference posture shown in FIGS. 12A and 13A (all the rollers 5 are in contact with the roller raceway surface 64 and the crawler belt 6 is averaged as a whole. In a state where the pressure is received), the wheel 5 is provided so that a sufficiently large distance S1 is provided between the position of the lower end of the stopper guide 7 and the inner peripheral surface of the crawler belt 6. The relative height position between the contact surface and the lower edge of the locking guide 7 is set.

However, as shown in FIGS. 12 (b) and 13 (b), the vehicle travels in a state in which a intensive thrust force acts from below the part of the wheels 5 such as climbing on the convex portion, as shown in FIG. In the posture), the crawler belt 6 is partially compressed or bent, and the detachment prevention guide 7 is relatively close to the inner peripheral surface of the crawler belt 6.
However, in the present invention, as described above, the lateral width L1 of the contact portion in the belt lateral width direction of the slip prevention guide 7 is larger than the lateral width L2 at the upper portion of the core metal protrusion 63 on the crawler belt 6 side. Since it is set large, as shown in the figure, when the slip-off prevention guide 7 and the inner peripheral surface of the crawler belt 6 approach each other, the contact location of the slip-off prevention guide 7 and the contact location on the upper part of the core metal projection 63 Further contact is prevented by the contact, and the interval S2 can be secured so as to avoid contact between the two.
That is, the lower edges 73, 74, and 75 of the slip-off prevention guide 7 are connected to the inner peripheral surface of the crawler belt 6 depending on the contact position in the range of the linear portion L 3 having the lateral width L 1 set on the slip-off prevention guide 7. Proximity restricting portion A that prevents contact with the side is configured.

The proximity restricting portion A of the locking guide 7 is a contact portion at the upper portion of the guide surface C of the cored bar projection 63 of both side surfaces B and B having a slanted slope of the locking guide 7. The both side surfaces B and B are slightly larger in angle than the taper angle formed by the inclination of the guide surfaces C and C of the left and right cored bar projections 63. The inclination angle is set to be tapered.
Therefore, even if the locking guide 7 is relatively strong and fits between the left and right cored bar projections 63, 63, the contact area at the proximity restricting portion A is relatively small, and the situation where the locking guide 7 is strongly bitten and is difficult to come off. Easy to avoid.

[Idler wheel]
As shown in FIGS. 2 and 11 (b), the idler wheels 4 and 4 are idle in a state where they enter between the left and right core metal protrusions 63 and 63 and are in contact with the inner peripheral surface of the crawler belt 6. Rotate.
At this time, the outer peripheral surfaces of the idler wheels 4 and 4 are rotated in contact with the inner peripheral surface side of the pressure receiving block portion 66 of the crawler belt 6 as described above. It can be avoided.
The both side surfaces of the idler wheels 4 and 4 may come into contact with the metal portions of the left and right cored bar protrusions 63 and 63, but at this point, the idler wheels 4 and 4 and the crawler belt 6 are almost relative to each other. Since it rotates without moving, even if the metal parts touch each other, the noise does not become so loud at this point, and the generation of noise can be suppressed.

[Other Embodiment 1]
As the stopper guide 7, on the bottom side of the upwardly open recessed space 76 as described in the embodiment, from the orthogonal lower edge range L <b> 4 where the orthogonal lower edge portion 73 (corresponding to the lowermost end surface) exists, back and forth Not only the mud hole 76a formed at a distant position, but a mud hole 76a continuous in the front-rear direction on the bottom side of the recessed space 76 may be formed in an arbitrary range.
Further, the detachment prevention guide 7 may be entirely formed in a hollow shape without providing such an upwardly open recessed space 76.

[Second embodiment]
On the upward surface 7A side of the stopper guide 7, as described in the embodiment, a flat upper surface 78a that is rearwardly lowered is provided on the most distal side, and an upper surface 78b that includes an upper edge 79 that is rearwardly raised is subsequently provided. The upper surface 78b provided with the upper edge 79 which rises rearward from the foremost side of the stopper guide 7 is not limited to the provided one, and the front end side is tapered, and the roof is formed so as to extend outwardly toward the lower rear side. It may be a thing.
In addition, as the shape of the roof shape formed on the upward surface 7, the cross section as shown in the above embodiment has an inverted V-shaped top portion, and the upper edge 79 that rises rearward is a sharp ridgeline. For example, it may be a trapezoidal shape having a slightly flat portion at the top of the cross-sectional shape, or a cross-sectional shape having a circular arc at the top. Any shape can be adopted as long as the mud can be slid down so that mud accumulation on the surface 7A can be suppressed.

[3 of another embodiment]
As the slip-off prevention guide 7, an example in which the upward surface 7 </ b> A as described in the embodiment is formed only at an end portion on the front side in the traveling direction of the crawler traveling device 2 is shown, but not limited thereto, the upward surface A roof-shaped upward surface 7A similar to 7A may be formed at the end of the crawler traveling device 2 on the rear side in the traveling direction. In this case, it is effective in preventing mud accumulation when the crawler belt 6 of the crawler traveling device 2 is driven in reverse.

[4 of another embodiment]
In the embodiment, as the proximity restricting portion A of the locking guide 7, the both side surfaces B and B having a tapered shape of the locking guide 7 are connected to the guide surfaces C and C of the left and right metal core protrusions 63. Although the inclination angle is set so that the taper is slightly larger than the angle of the taper formed by the inclination, the present invention is not limited to this, and both sides of the anti-skid guide 7 have a constricted inclination. The taper angle formed by the inclination of the surfaces B and B and the guide surfaces C and C of the left and right cored bar protrusions 63 may be set to the same angle. When the same angle is set in this manner, the area of the contact location can be increased and the surface pressure per unit area can be reduced, which is advantageous in that the degree of wear at the contact location can be reduced.

  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 4 idler wheel 5 wheel 6 crawler belt 7 locking guide 7A upward surface 7B downward surface 20 track frame 60 belt body 61 core metal 62 engaging recess 63 core metal projection 64 roller raceway surface 72 mounting Part 76 recessed space 76a mud hole 77a front end lower edge 79 upper edge A proximity regulating part

Claims (5)

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 on which a roller raceway surface is formed on the inner peripheral surface of the belt body located on the laterally outer side of the core metal projection, and the crawler belt rotating in the belt circumferential direction. A crawler traveling device comprising a drive sprocket for applying power, an idler wheel for guiding an inner peripheral surface side of the crawler belt, and the wheel.
Located between the pair of left and right cored bar protrusions, and provided with a slip-off preventing guide for preventing the crawler belt from coming off,
On the lower surface side of the front portion of the anti-slip guide, the front end is provided with a lower front edge that rises forward toward the front side, the front end side is tapered, and a boat-shaped downward surface that extends outward toward the upper rear side,
On the upper surface side of the front portion of the anti-slip guide, a rear-upward upper edge is provided toward the rear side, and a roof-shaped upward surface that is tapered toward the front end side and outwards toward the rear lower side is provided. The crawler traveling device characterized by the above-mentioned.   The contact prevention guide is provided with a proximity restricting portion that prevents the lower edge of the release prevention guide from contacting the inner peripheral surface of the crawler belt by contact with the inner side surface of the core metal protrusion. The crawler traveling device according to 1.   The slip-off prevention guide has a recessed space that opens upward on the rear side of the roof-shaped portion having an upward surface. The crawler traveling device according to claim 1, wherein a mud hole that communicates with the recessed space is formed at the position.   The crawler travel device according to claim 3, wherein the slip-off preventing guide is disposed so that a recessed space that is open upward is located at a position overlapping with the wheel in a side view.   5. The rear end side of the upper edge of the rear rising shape on the upper surface side of the front portion of the locking guide is connected to a mounting portion for mounting the locking guide to the track frame. The crawler traveling device described.

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