JP5801530B2 - 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 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 a crawler belt between the pair of left and right cored bar protrusions, 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] An anti-separation guide (a guide for preventing wheel loss in Patent Document 1) is attached to the track frame via a stay, and is composed of a bar having a trapezoidal cross section so as to be in sliding contact with the inner surface of the core metal protrusion. Thing (refer patent document 1).

JP 2003-81144 A (paragraph [0032], FIG. 1, FIG. 4, FIG. 5, FIG. 6)

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.
In other words, the pair of left and right cored bar projections is configured integrally with the cored bar embedded in the rubber crawler belt, and usually only the projected part projects to the inner peripheral surface side of the crawler belt. For this reason, the crawler portion between the left and right core metal projections is a relatively thin layer of rubber covering the inner peripheral surface side of the core metal.
For this reason, when a push-up action from the lower side acts on the crawler belt, the lower edge of the stopper guide located between the core metal protrusions is a rubber layer covering the inner peripheral surface side of the core metal. The rubber layer may be slidably contacted and damaged in an early stage. As a result, the rubber layer of the crawler belt contacts the idler wheel that contacts the inner peripheral surface of the belt between the left and right core metal protrusions, and the rubber layer disappears so that the metal core is directly The part which touches will arise. As a result, when the metal idler wheel rides on the metal core and comes into direct contact with the metal core, there is a risk that a loud noise will be generated at that portion.

  An object of the present invention is to provide a crawler traveling device capable of suppressing the generation of noise during traveling by avoiding direct contact between a metal idler wheel outer periphery and a metal cored bar. There is to do.

The technical means of the present invention taken in order to achieve the above object has the following structural features and operational effects.
[Solution 1]
The cored bar is embedded in the belt body made of rubber material at a constant pitch in the belt circumferential direction, and a pair of left and right cored bar projections for rolling guides project from the intermediate part in the belt width direction of each cored bar to the belt inner peripheral surface side. A crawler belt 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 drive sprocket which imparts power, and an idler wheel which guides the inner peripheral surface side of the crawler belt between the pair of left and right core metal projections, a crawler traveling apparatus having a the rolling wheels, the right and left A slip-off prevention guide for preventing the crawler belt from coming off is provided between the core metal projections of the core metal projection. Edge is claw Proximity restricting portions that prevent contact with the inner surface of the belt are provided, and the adjoining restricting portions are formed by both side surfaces having a constricted slope of the detachment prevention guide, and the both side surfaces. , of the guide surface of the core metal projections located on the left and right of the out-stop guide, so that a large angle of taper than the angle of taper formed at an inclination of the left and right guide surfaces of the position opposing the side surfaces The proximity restricting portion is configured such that the both side surfaces are in line contact with the guide surface along the circumferential direction of the crawler belt, so that the lower edge of the slip-off preventing guide is the crawler belt. It is characterized by preventing contact with the inner surface side .

[Operation and effect of invention according to Solution 1]
According to the configuration shown in the above solution 1, since the proximity prevention portion that prevents the lower edge of the slip prevention guide from contacting the inner surface of the crawler belt by contact with the core metal protrusion is provided in the slip prevention guide. The slip-off prevention guide can be prevented from sliding on the inner surface side of the crawler belt. Therefore, the rubber layer on the inner peripheral surface side of the crawler belt is not damaged by the sliding contact of the stopper guide.
As a result, the metal idler wheel can be prevented from coming into direct contact with the inner peripheral surface side of the metal core, and the above-described noise can be suppressed.

[Solution 2]
According to another technical means of the present invention taken to solve the above-mentioned problem, as described in claim 2, the crawler belt has an engaging recess that engages with the driving claw of the driving sprocket on the inner peripheral surface side thereof. The engaging recess is located between the core bars in the belt circumferential direction and the belt width in a state where a rubber pressure receiving block is interposed between the core bars before and after the circumferential direction. The drive sprocket is provided with a disk-shaped member that is fitted between the left and right cored bar projections on the outer peripheral side, and the crawler belt is arranged at predetermined intervals on the outer peripheral side of the disk-shaped member. It is provided with the said drive nail | claw body which engages in the recessed part for engagement formed.

[Operation and effect of invention according to Solution 2]
According to the configuration shown in the above solution 2, the crawler belt includes an engagement recess provided in the arrangement interval of the cored bar on the inner peripheral surface side of the crawler belt, and a driving claw body engaged with the engagement recess. In addition, since a rubber pressure receiving block is interposed between the front and back core bars in the circumferential direction, direct contact between the metal core bars and the metal drive sprocket is avoided. Power can be transmitted.
Therefore, there is an advantage that the crawler belt driven by the drive sprocket can be driven in a state where noise is not generated by avoiding contact between metals.

[Solution 3]
According to another technical means of the present invention taken to solve the above-mentioned problem, the pressure receiving block portion positioned at the front and back in the circumferential direction of the core metal is the inner peripheral surface of the core metal as described in claim 3. The inner periphery of the idler wheel protrudes inward and the gap between the outer periphery of the idler wheel and the inner peripheral surface of the core metal is formed with the outer periphery of the idler wheel in contact with the inner periphery of the pressure receiving block. It is that.

[Operation and effect of invention according to Solution 3]
According to the configuration shown in the solution means 3 described above, the belt inner peripheral surface of the pressure receiving block portion located in the front and rear in the circumferential direction of the core bar protrudes inward from the inner peripheral surface of the core bar. Therefore, there is a gap between the outer peripheral edge of the idler wheel and the inner peripheral surface of the core metal with the outer peripheral edge of the idler wheel in contact with the inner peripheral surface of the pressure receiving block.
Therefore, even if the coating on the inner peripheral side of the core bar is peeled off by biting of earth or sand or pebbles or the inner peripheral side of the core bar is not covered, a metal idler is applied to the core bar. There is an advantage that the wheel can be prevented from coming into direct contact and the generation of noise due to contact between metals can be avoided.

Overall side view of tractor Overall side view of crawler traveling device Top view of crawler belt IV-IV sectional view in FIG. Partial cross-sectional view of the crawler belt in the belt circumferential direction Schematic perspective view showing cored bar protrusion Perspective view showing a part of the drive sprocket The stopper guide is shown, (a) is a plan view, (b) is a side view, and (c) is a front view. 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. Illustration showing Explanatory drawing which shows the proximity | contact regulation state of a stopper guide and a core metal protrusion, (a) shows a reference | standard attitude | position, (b) shows the maximum proximity | contact attitude | position. Explanatory drawing which shows the contact state of an idler wheel and a crawler belt

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. 11, the pressure receiving block 66 has an inner peripheral surface of the idler wheel 4 and an inner surface of the metal core 61 with the idler wheel 4 in contact with the inner peripheral surface of the pressure receiving block 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 6, the metal core protrusion 63 constitutes a belt main body 60 by a metal protrusion 61 a that is integrally formed with a part of the metal core 61 and protrudes toward the inner peripheral surface of the belt. The outer shape is formed substantially in a mountain shape by covering with a mountain-shaped protrusion 67 made of a rubber material.
That is, the core metal protrusion 63 is formed in a mountain shape in a sectional view both in the belt width direction shown in FIG. 4 and in the belt circumferential direction shown in FIG. As shown in FIG. 6, the surface facing the inner side of the core metal protrusion 63 in the belt width direction is formed by an inclined surface that serves as a guide surface C for the idler wheel 4 and the detachment prevention guide 7.
Further, the mountain-shaped cored bar projection 63 is formed in a T shape in a plan view with a top portion 63a of a line along the belt circumferential direction and a line directed inward so as to be orthogonal to the line. The protrusion 67 is formed in a shape in which a recess 63 b is provided at a position located on the inner side in the belt width direction near the top 63 a on the guide surface C.

(Drive sprocket)
The drive sprocket 3 is configured as shown in FIGS.
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 FIG. 7 and FIG. 9A, the driving claw body 31 protrudes laterally with respect to the plate surface of the disk-shaped member 30, so that the length of the engagement concave portion 62 in the belt lateral width direction is increased. 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, 8, 9 (c), and 10.
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. 8, 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 which becomes the lowermost end of the locking guide 7 is a perpendicular line y1 from the rotation center p of the roller 5 shown in FIGS. 2 and 8B. It is a crossing position. 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 contact position in the belt width direction at the position intersecting the perpendicular line y1 is the core metal protrusion 63 at 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. The width is set to be larger than the lateral width L2 at the contact point in the upper part.

As shown in FIGS. 8A and 8B, the width L1 of the contact portion in the belt lateral width direction of the slip-off preventing guide 7 is a linear portion in the belt circumferential direction (front-rear direction) of the slip-off preventing guide 7. The front and rear ends of the stopper guide 7 are tapered in plan view as shown in FIG. 8A before and after the linear portion L3. In the side view, as shown in FIG. 8 (b), the front and rear ends are formed to warp upward.
Further, in the linear portion L3 of the locking guide 7, near the portion intersecting the perpendicular line y1, there is an orthogonal lower edge portion 73 orthogonal to the perpendicular line y1 as shown in FIG. 8B. An orthogonal lower edge range L4 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 upward shape, and the orthogonal lower edge The rear lower edge portion 75 behind the range L4 is formed in a slightly rearwardly rising 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.
Further, the front end side and the rear end side of the slip prevention guide 7 are formed in a tapered shape in a plan view, as described above, the guiding action by the slip prevention guide 7 having a wide width L1 in the belt lateral width direction is smooth. This is to make it happen. Furthermore, as described above, the front and rear ends of the locking guide 7 are formed in a shape that warps upward in addition to the tapered shape in plan view. This is to make it easier to avoid pebbles or the like being caught between them and to prevent the warped portions of the front and rear ends from coming into direct contact with the crawler belt 6.

  The anti-separation guide 7 configured as described above has a reference posture shown in FIG. 10A (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. (Traveling posture in the state) is sufficiently between the position that is the lowermost end of the stopper guide 7 and the inner peripheral surface of the crawler belt 6 (the inner peripheral surface of the pressure receiving block portion 66 in this embodiment). The relative height position between the contact surface of the wheel 5 and the lower surface of the slip-off preventing guide 7 is set so as to have a large distance S1.

However, as shown in FIG. 10 (b), in the maximum proximity posture (running 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.
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 to be large, as shown in the drawing, the slip prevention guide 7 and the inner peripheral surface of the crawler belt 6 (in this embodiment, the inner peripheral surface of the pressure receiving block portion 66) are prevented from coming off. The contact between the contact location of the guide 7 and the contact location at the upper portion of the core metal protrusion 63 prevents further approach, and the interval S2 can be secured so as to avoid contact between the two.
In other words, the lower edge of the stopper guide 7 is in contact with the inner peripheral surface side of the crawler belt 6 by the contact portion in the range of the linear portion L3 having the lateral width L1 set to the stopper guide 7. Proximity restricting part A is configured to prevent this.

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 9B, 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.

[ 1 of another embodiment]
The stopper guide 7 is not limited to one having two front and rear structures as described in the embodiment. For example, only one of the front and rear is provided, or a long disconnection from the front end side to the rear end side is provided. A stop guide 7 may be provided.

  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.

DESCRIPTION OF SYMBOLS 2 Crawler traveling device 3 Drive sprocket 4 Idler wheel 5 Rolling wheel 6 Crawler belt 7 Detachment prevention guide 66 Pressure receiving block part 30 Disk-shaped member 31 Drive claw body 60 Belt main body 61 Core metal 62 Engaging concave part 63 Core metal protrusion 64 Rolling wheel Track surface A Proximity control section
B Both sides of locking guide
Guide surface L of C cored bar L1 width L2 width S1 distance S2 distance S3 gap

Claims (3)

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 drive sprocket which imparts power, and an idler wheel which guides the inner peripheral surface side of the crawler belt between the pair of left and right core metal projections, a crawler traveling apparatus having a the rolling wheels,
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,
The slip prevention guide includes a proximity restricting portion that prevents the lower edge of the slip prevention guide from contacting the inner surface of the crawler belt by contact with the core metal protrusion,
This proximity restricting portion is formed by both side surfaces having a lower Subomari like inclined in the off-stop guide, and the two side surfaces, said anti-removal guide of the guide surface of the core metal projections located on the left and right Among them, the inclination angle is set so as to be a taper having a larger angle than the angle of the taper formed by the inclination of the left and right guide surfaces at positions facing the both side surfaces ,
The proximity restricting portion prevents the lower edge of the detachment prevention guide from coming into contact with the inner surface of the crawler belt when the both side surfaces are in line contact with the guide surface along the circumferential direction of the crawler belt. crawler traveling apparatus characterized in that it. The crawler belt is provided with an engagement concave portion that engages with the drive claw of the drive sprocket on the inner peripheral surface side, and the engagement concave portion is located between the core bars in the belt circumferential direction and is arranged in the circumferential direction. It is formed long in the belt width direction with a rubber pressure receiving block interposed between
The drive sprocket includes a disk-shaped member fitted on the outer peripheral side between the left and right cored bar projections, and is engaged with an engagement recess formed on the crawler belt at predetermined intervals on the outer peripheral side of the disk-shaped member. The crawler traveling device according to claim 1, further comprising the driving claw body to enter.   The pressure receiving block portion positioned in the front and back in the circumferential direction of the core metal protrudes inward from the inner peripheral surface of the core metal, and the outer peripheral edge of the idler wheel is in contact with the inner periphery of the pressure receiving block portion. The crawler traveling device according to claim 1 or 2, wherein a gap is formed between the outer peripheral edge of the idler wheel and the inner peripheral surface of the cored bar.

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