JP2014043174A - Crawler travel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crawler travel device having a rolling wheel separable into an inner diameter section and an outer diameter section with a compact size and light weight and having strong connection strength between the inner diameter section and the outer diameter section.SOLUTION: A crawler travel device comprises: a drive wheel which is supported on a traveling machine body and into which driving force is input; a track frame 4 supported on the traveling machine body; a shaft member 9 rotatably supported on the track frame 4; a rolling wheel 1 which is connected to the shaft member 9 and is rotated integrally with the shaft member 9; and a crawler belt 7 wound and extended around the drive wheel and the rolling wheel 1. The rolling wheel 1 can be separated into an inner diameter section 101 connected to an end of the shaft member 9 and an outer diameter section 102 connected to be detachable from the inner diameter section 101. In the inner diameter section 101, a large diameter section 105 and a small diameter section 106 are formed in a step shape along an axial direction of the shaft member 9. In the outer diameter section 102, a large diameter recess 107 into which the large diameter section 105 is fitted and a small diameter recess 108 into which the small diameter section 106 is fitted are formed in a step shape.

Description

  The present invention includes a driving wheel that is supported by a traveling machine body and receives driving force, a track frame that is supported by the traveling machine body, a shaft member that is rotatably supported by the track frame, and the shaft member. A wheel that is connected to the shaft member and rotates integrally with the shaft member, and a crawler belt that is wound around the drive wheel and the wheel, and the wheel is an end portion of the shaft member. The present invention relates to a crawler traveling device that is separable into an inner diameter portion that is connected to the inner diameter portion and an outer diameter portion that is detachably connected to the inner diameter portion.

  Conventionally, as such a crawler traveling device, for example, there is a technique as described in Patent Document 1. In such a crawler traveling device, the wheel can be separated into an inner diameter portion (in the literature, “boss portion”) and an outer diameter portion (in the literature, “wheel portion”). Even if there is a difference in the degree of deterioration between the two parts, it is only necessary to replace one having a large degree of deterioration, and the running cost can be reduced as compared with the case where the inner diameter part and the outer diameter part are integrally formed.

  Moreover, in the technique described in Patent Document 1, a recessed fitting portion formed on the inner periphery of the outer diameter portion is fitted to the outer periphery of the inner diameter portion, and the outer diameter portion and the inner diameter portion are bolted together. Thus, the inner diameter portion and the outer diameter portion are connected. And the thickness of the inner diameter part and the outer diameter part in the axial direction of the shaft member ("shaft" in the literature) are set to be relatively large, and the shaft core between the outer periphery of the inner diameter part and the fitting part of the outer diameter part It is comprised so that the fitting length in a direction may become long. As a result, the inner diameter portion and the outer diameter portion are firmly connected, and the wheel can be smoothly rotated while maintaining a state parallel to a plane orthogonal to the shaft member (“shaft” in the literature).

JP-A-8-239066 (in particular, see paragraphs 0006 to 0008, FIG. 1)

  By the way, in addition to the normally assumed long-term force such as the load on the traveling vehicle body and the reaction force from the ground against the load, a short-term large impact force based on the steep unevenness of the ground acts on the wheels. There are things to do. Therefore, when the roller is configured so as to be separated into the inner diameter portion and the outer diameter portion, the connection strength between the inner diameter portion and the outer diameter portion becomes a problem.

  However, in the crawler traveling device described in Patent Literature 1, by taking a long fitting length along the axial direction between the outer periphery of the inner diameter portion and the fitting portion of the outer diameter portion, Since the connection strength is secured, it is necessary to set a large fitting length along the axial direction in order to increase the connection strength. As a result, there is a risk that an increase in the member weight of the wheel, an increase in the size of the wheel in the axial direction, and the like may be caused.

  In view of such circumstances, the present invention provides a crawler in which a roller is separable into an inner diameter portion and an outer diameter portion, is compact and lightweight, and has a strong connection strength between the inner diameter portion and the outer diameter portion. An object is to provide a traveling device.

The feature of the present invention is that
A driving wheel that is supported by the traveling machine body and receives driving force;
A track frame supported by the traveling machine body;
A shaft member rotatably supported by the track frame;
A roller wheel coupled to the shaft member and rotating integrally with the shaft member;
A crawler belt wound around the drive wheel and the wheel, and provided.
The roller is separable into an inner diameter portion connected to an end portion of the shaft member and an outer diameter portion connected so as to be detachable with respect to the inner diameter portion,
A large diameter portion and a small diameter portion are formed in a step shape along the axial direction of the shaft member in the inner diameter portion,
A large-diameter recess into which the large-diameter portion is inserted and a small-diameter recess into which the small-diameter portion is inserted are formed in the outer diameter portion in steps.

  According to the present invention, the inner diameter portion is formed with a large diameter portion and a small diameter portion, the outer diameter portion is formed with a large diameter recess and a small diameter recess, and the inner diameter portion and the outer diameter portion are the large diameter portion. And the large-diameter concave portion and the small-diameter portion and the small-diameter concave portion are connected to each other. The fitting position between the large-diameter portion and the large-diameter concave portion and the fitting position between the small-diameter portion and the small-diameter concave portion are set to be different both in the axial direction of the shaft member and in the radial direction of the shaft member. ing.

  Therefore, when an external force acts on the wheel and the inner diameter portion and the outer diameter portion are inclined relatively, the fitting force between the large diameter portion and the large diameter concave portion and the fitting force between the small diameter portion and the small diameter concave portion Assist each other at different positions in the axial direction and the radial direction, and a synergistic coupling force is exhibited.

  Specifically, for example, when the outer diameter portion is about to be inclined with respect to the inner diameter portion, when a cross section along the axis of the wheel is considered, a large-diameter recess is formed on one side across the axis. The small diameter concave part is pressed against the small diameter part, and the step part between the small diameter concave part and the large diameter concave part is pressed against the step part between the small diameter part and the large diameter part. Thus, the outer diameter portion is prevented from being inclined with respect to the inner diameter portion. At the same time, on the other side across the shaft core, the small-diameter concave portion tends to be lifted from the small-diameter portion, but the large-diameter concave portion is pressed against the large-diameter portion, and the small-diameter concave portion and the large-diameter concave portion Is pressed against the step portion between the small diameter portion and the large diameter portion, and the outer diameter portion is prevented from being inclined with respect to the inner diameter portion.

  Thus, according to the present invention, even if the fitting length in the axial direction between the large diameter portion and the large diameter concave portion and the fitting length in the axial direction between the small diameter portion and the small diameter concave portion are short, Since the connection strength with the outer diameter portion is ensured, compared with the case where the convex portion and the concave portion are simply fitted in the axial direction, the wheel is compact and light weight, and the inner diameter portion The crawler traveling device has a strong connection strength with the outer diameter portion.

The present invention
The outer diameter portion is connected to the inner diameter portion so as to be detachable along the axial direction,
The large diameter portion is located on the central portion side of the shaft member in the axial direction, and the small diameter portion is located on a side farther from the central portion than the large diameter portion in the axial direction. It is preferable that

  According to this configuration, the large diameter portion and the small diameter portion are formed in this order from the central portion side of the shaft member in the axial direction. That is, the large-diameter concave portion and the small-diameter concave portion are also formed in this order from the central portion side of the shaft member in the axial direction. As a result, the outer diameter portion can be attached to and detached from the front side (in the axial direction of the shaft member) along the axial direction with respect to the inner diameter portion, and the replacement work of the outer diameter portion is facilitated.

The present invention
When the outer diameter portion and the inner diameter portion are connected, it is preferable that the large diameter portion and the large diameter recess come into contact with each other in the entire circumferential direction.

  According to this configuration, the outer diameter portion and the inner diameter portion are coupled in a state in which the large diameter portion and the large diameter concave portion are in contact with each other in the circumferential direction, so that the large diameter portion and the large diameter concave portion in the circumferential direction are connected. The fitting length is increased, and the connection strength between the outer diameter portion and the inner diameter portion is further improved. Further, although the wheel rotates, since the large diameter portion and the large diameter concave portion are connected in contact with each other in the entire circumferential direction, the above connection strength is obtained regardless of the rotation position of the wheel. Guaranteed.

The present invention
When the outer diameter portion and the inner diameter portion are connected, it is preferable that the small diameter portion and the small diameter recess come into contact with each other in the entire circumferential direction.

  According to this configuration, the outer diameter portion and the inner diameter portion are connected in a state in which the small diameter portion and the small diameter concave portion are in contact with each other in the circumferential direction, so that the fitting length between the small diameter portion and the small diameter concave portion in the circumferential direction is The connection strength between the outer diameter portion and the inner diameter portion is further improved. In addition, although the wheel rotates, since the small diameter portion and the small diameter concave portion are connected in contact with each other in the circumferential direction, the above connection strength is ensured regardless of the rotation position of the wheel. The

The present invention
The outer peripheral shape of the large-diameter portion and the inner peripheral shape of the large-diameter recess are such that the outer-diameter portion cannot be rotated relative to the inner-diameter portion when the large-diameter portion is fitted into the large-diameter recess. It is preferable that the shape is set.

  According to this configuration, when the large-diameter portion is fitted into the large-diameter concave portion, the outer-diameter portion cannot be rotated relative to the inner-diameter portion. That is, the circumferential position (relative phase) of the outer diameter portion relative to the inner diameter portion is uniquely determined. Therefore, according to this configuration, the outer diameter portion is positioned in the circumferential direction with respect to the inner diameter portion simply by applying the inner diameter portion to the outer diameter portion during the assembling work. As a result, for example, in the case where the final fixing of the outer diameter portion and the inner diameter portion is performed by bolt fastening, the positioning of the bolt holes or the like becomes unnecessary, and the assembling work becomes easy.

The present invention
The outer peripheral shape of the small-diameter portion and the inner peripheral shape of the small-diameter concave portion are set so that the outer-diameter portion cannot be rotated relative to the inner-diameter portion when the small-diameter portion is fitted into the small-diameter concave portion. It is preferable that

  According to this configuration, when the small-diameter portion is fitted into the small-diameter concave portion, the outer-diameter portion cannot be rotated relative to the inner-diameter portion. That is, the circumferential position (relative phase) of the outer diameter portion relative to the inner diameter portion is uniquely determined. Therefore, according to this configuration, the outer diameter portion is positioned in the circumferential direction with respect to the inner diameter portion simply by applying the inner diameter portion to the outer diameter portion during the assembling work. As a result, for example, in the case where the final fixing of the outer diameter portion and the inner diameter portion is performed by bolt fastening, the positioning of the bolt holes or the like becomes unnecessary, and the assembling work becomes easy.

It is a side view of a crawler traveling device. It is a disassembled perspective view which shows the assembly point of a boss | hub member and a wheel. It is a side view of the periphery of a wheel, (a) shows the state which connected the outer diameter part to the inner diameter part, and (b) shows the state which removed the outer diameter part from the inner diameter part. It is sectional drawing of the IV-IV arrow in Fig.3 (a). It is a figure which shows an internal diameter part, Comprising: (a) is a front view, (b) is sectional drawing of the Vb-Vb arrow in (a), (c) is a rear view. It is a figure which shows an outer diameter part, Comprising: (a) is a front view, (b) is sectional drawing of VIb-VIb arrow in (a), (c) is a rear view.

  Below, the crawler traveling apparatus of this invention is demonstrated based on drawing.

[Overall configuration of crawler travel device]
As shown in FIG. 1, the crawler traveling device includes a driving sprocket 3 (corresponding to “driving wheels”) that is supported by the traveling machine body 2 and receives driving force, and a rear side of the driving sprocket 3. A front and rear track frame 4 supported by the traveling machine body 2, a plurality of wheels 1 rotatably supported by the track frame 4 in parallel with the front and rear direction, and a rear end portion of the track frame 4 are rotatable. A supported guide wheel 6, a drive sprocket 3, a roller 1, and a crawler belt 7 wound around the guide wheel 6 are provided.

  As shown in FIG. 4, a boss member 8 is fixed to the track frame 4, and a left and right shaft member 9 is rotatably supported by the boss member 8. A pair of left and right rolling wheels 1 and 1 are connected to the left and right ends of the shaft member 9 in a non-rotatable manner. The wheel 1 rotates integrally with the shaft member 9 while being positioned on both the left and right sides of the track frame 4. The pair of left and right wheels 1, 1 use the same member in a state where the left and right are reversed.

[About Track Frame]
As shown in FIGS. 2 and 4, the track frame 4 is formed in an angular U-shape that opens downward. As shown in FIGS. 2 and 3B, a pair of left and right cutouts 4A and 4A are formed on the left and right wall portions of the track frame 4 at a position corresponding to the mounting position of the boss member 8 in the track frame 4. Are formed respectively. The cutout 4 </ b> A is formed in a curved shape (arc shape) corresponding to the outer peripheral shape of the boss member 8.

[About boss members]
As shown in FIG. 4, the boss member 8 is provided with a cylindrical bearing portion 8A that opens in the left-right direction, and a pair of front and rear mounting portions 8B and 8B as shown in FIGS. ing. The front and rear mounting portions 8B and 8B are formed so as to protrude in a slightly curved state upward from the front side portion and the rear side portion of the bearing portion 8A. As shown in FIG. 4, the length of the mounting portion 8 </ b> B in the left-right direction is set to be approximately the same as the inner width between the left and right wall portions of the track frame 4.

  A configuration for fixing the boss member 8 to the track frame 4 will be described. As shown in FIGS. 2 and 3B, the upper portion of the bearing portion 8A enters the left and right cutouts 4A and 4A. As shown in FIGS. 3B and 4, the front and rear mounting portions 8B and 8B are inserted between the left and right wall portions of the track frame 4, and the front and rear mounting portions 8B and 8B and the left and right of the track frame 4 are inserted. Both wall portions are fastened and fixed by bolts 8C and 8C.

  In this state, the upper end portion of the attachment portion 8B is in contact with the inner upper surface of the track frame 4. That is, when the upper end portion of the mounting portion 8B and the inner upper surface of the track frame 4 are in contact, the load of the traveling machine body 2 does not directly act on the bolt 8C, and the shearing force based on the load or the like is applied to the bolt 8C. The bolt 8C is not damaged by the action.

[About shaft members]
As shown in FIG. 4, the shaft member 9 is rotatably supported on the inner peripheral side of the bearing portion 8A via a bearing 8D. Seals 8E are provided between both end portions of the bearing portion 8A and left and right end portions 9A, 9A of the shaft member 9, respectively.

[About wheels]
As illustrated in FIGS. 2 to 4, the roller 1 is configured to be separable into an inner diameter portion 101 and an outer diameter portion 102. As shown in FIG. 4, left and right end portions 9A, 9A of the shaft member 9 protrude from both end portions of the bearing portion 8A, and an inner diameter portion 101 is connected to the left and right end portions 9A, 9A. The outer diameter portion 102 is configured to be detachably connected to the inner diameter portion 101 along the axial direction of the shaft member 9. Hereinafter, the end 9A of the shaft member 9 is referred to as “shaft end 9A”, the shaft core of the shaft member 9 is referred to as “shaft core L”, and the direction of the shaft core L of the shaft member 9 is referred to as “shaft core direction”. Called. In addition, for convenience of explanation, the direction of the central portion side of the shaft member 9 in the axial direction is referred to as “inner side”, and the side opposite to the central portion side of the shaft member 9 (the rolling wheel with respect to the track frame 4). The direction outside 1) is referred to as “outside”.

  A connection structure between the inner diameter portion 101 and the shaft end portion 9A will be described. As shown in FIGS. 4 and 5, the inner diameter portion 101 is recessed in the inner portion, and is formed to penetrate from the boss recess 103 to the outer portion through the boss recess 103 covering the end of the boss member 8. And a connecting hole 104. The shaft end portion 9A and the connecting hole 104 are formed in a tapered shape that is reduced in diameter toward the outside, and are formed in a shape (for example, spline fitting) that can be deformed. Then, after fitting the connecting hole 104 to the shaft end portion 9A along the axial direction, the nut 9B is fastened to the shaft end portion 9A, and the inner diameter portion 101 is connected and fixed to the shaft member 9.

  The shapes of the inner diameter part 101 and the outer diameter part 102 will be described. As shown in FIGS. 2, 4, and 5, the inner diameter portion 101 is formed with a large diameter portion 105 and a small diameter portion 106 in a step shape along the axial direction. Thereby, a stepped portion 120 is formed between the large diameter portion 105 and the small diameter portion 106. As shown in FIG. 4, the small-diameter portion 106 is formed continuously outside the large-diameter portion 105 in the axial direction. That is, the large diameter portion 105 is located on the central portion side of the shaft member 9 in the axial direction, and the small diameter portion 106 is located on the side farther from the central portion of the shaft member 9 than the large diameter portion 105 in the axial direction. Yes. The step portion 120 is formed in a planar shape orthogonal to the axis.

  As shown in FIGS. 2, 4, and 6, the outer diameter portion 102 has a large-diameter recess 107 into which the large-diameter portion 105 is inserted and a small-diameter recess 108 into which the small-diameter portion 106 is inserted. Are formed in steps. As a result, a step 121 is formed between the large-diameter recess 107 and the small-diameter recess 108. As shown in FIG. 4, the small-diameter recess 108 is formed continuously outside the large-diameter recess 107 in the axial direction. That is, the large-diameter concave portion 107 is positioned on the central portion side of the shaft member 9 in the axial direction, and the small-diameter concave portion 108 is positioned farther from the central portion than the large-diameter concave portion 107 in the axial direction. The step portion 121 is formed in a planar shape orthogonal to the axis.

  As shown in FIGS. 2 to 5, the large-diameter portion 105 includes three projecting portions 109 projecting along the radial direction. The three protrusions 109 are provided at equal intervals of 120 degrees in the circumferential direction of the axis L. As shown in FIGS. 2, 3A, 4 and 6, the large-diameter recess 107 is provided with three recesses 110 into which the protrusions 109 are inserted. The outer peripheral shape of the large-diameter recess 107 is formed in a shape corresponding to the outer peripheral shape of the large-diameter portion 105. That is, the large-diameter portion 105 and the large-diameter concave portion 107 can be fitted in different shapes, whereby the outer-diameter portion 102 cannot rotate relative to the inner-diameter portion 101.

  The outer peripheral shape of the small diameter part 106 is formed in a circular shape as shown in FIGS. The inner peripheral shape of the small-diameter concave portion 108 is formed in a circular shape corresponding to the outer peripheral shape of the small-diameter portion 106 as shown in FIGS. 2, 3 (a), and 6.

  2 and 4, the outer peripheral surface of the large diameter portion 105, the outer peripheral surface of the small diameter portion 106, the inner peripheral surface of the large diameter concave portion 107, and the inner peripheral surface of the small diameter concave portion 108 are all around the circumference. Any of these positions is formed in a surface shape parallel to the axis L.

  As shown in FIGS. 5 and 6, a bolt hole 109 </ b> A and a bolt hole 110 </ b> A are drilled in the protrusion 109 and the recess 110, respectively, along the axial direction. As shown in FIG. 4, the bolt hole 109 </ b> A and the bolt hole 110 </ b> A are provided at positions that are in phase when the large-diameter portion 105 and the small-diameter portion 106 are fitted into the large-diameter concave portion 107 and the small-diameter concave portion 108. The outer diameter portion 102 and the inner diameter portion 101 can be fixed by fastening the bolt 111 to the bolt hole 109A and the bolt hole 110A, as shown in FIGS.

  When the outer diameter portion 102 and the inner diameter portion 101 are connected, as shown in FIGS. 3A and 4, the large diameter portion 105 and the large diameter recess 107 are in contact with each other in the circumferential direction, and the small diameter is obtained. The portion 106 and the small-diameter concave portion 108 are in contact with each other in the circumferential direction, and the step portion 120 and the step portion 121 are in contact in the entire circumferential direction.

[About connecting the outer and inner diameter parts]
As shown in FIGS. 2 and 4, the outer diameter portion 102 is set to the inner diameter portion 101 so that the large diameter portion 105 and the small diameter portion 106 are fitted into the large diameter concave portion 107 and the small diameter concave portion 108, respectively. Install from the outside along the axial direction. Since the protruding portion 109 and the recessed portion 110 are provided at equal intervals (120 degrees), there are three patterns in which insertion is possible, and the insertion operation is easy.

  Further, the bolt hole 109A and the bolt hole 110A are aligned with each other only by inserting the large diameter portion 105 and the small diameter portion 106 into the large diameter concave portion 107 and the small diameter concave portion 108, respectively. It is unnecessary.

  The outer peripheral surface of the large-diameter portion 105, the outer peripheral surface of the small-diameter portion 106, the inner peripheral surface of the large-diameter concave portion 107, and the inner peripheral surface of the small-diameter concave portion 108 are each formed into a surface shape that is parallel to the axis L. Therefore, when the large diameter portion 105 and the small diameter portion 106 are fitted into the large diameter concave portion 107 and the small diameter concave portion 108, the outer diameter portion 102 is caught by the inner diameter portion 101. Further, since the protruding portion 109 and the recessed portion 110 are engaged with each other, the outer diameter portion 102 does not rotate relative to the inner diameter portion 101. As described above, if the large-diameter portion 105 and the small-diameter portion 106 are fitted into the large-diameter concave portion 107 and the small-diameter concave portion 108, respectively, the outer-diameter portion 102 does not fall off the inner-diameter portion 101. Since the diameter portion 102 does not rotate with respect to the inner diameter portion 101, the bolt 111 can be fastened with the other hand in a stable state, and one person can easily replace the outer diameter portion 102. It can be carried out.

[Connection strength between outer diameter and inner diameter]
The connection strength between the outer diameter portion 102 and the inner diameter portion 101 will be described with reference to FIG. For example, it is assumed that an external force acts on the left roller 1 toward the paper surface of FIG. 4 and the left outer diameter portion 102 tries to tilt counterclockwise with respect to the left inner diameter portion 101.

  At this time, on the upper side of the axis L, the large-diameter concave portion 107 tends to behave with respect to the large-diameter portion 105, but the small-diameter concave portion 108 is pressed against the small-diameter portion 106, and the step The inner peripheral side portion of the portion 121 is pressed against the step portion 120, and the outer diameter portion 102 is suppressed from being inclined with respect to the inner diameter portion 101. At the same time, on the lower side across the axis L, the small-diameter concave portion 108 tends to behave as if it floats from the small-diameter portion 106, but the large-diameter concave portion 107 is pressed against the large-diameter portion 105 and the stepped portion 121. The outer peripheral side portion is pressed against the step portion 120, and the outer diameter portion 102 is prevented from being inclined with respect to the inner diameter portion 101.

  Further, since the large diameter portion 105 and the large diameter concave portion 107 are in contact with each other around the entire circumference, the small diameter portion 106 and the small diameter concave portion 108 are in contact with each other, and the step portion 120 and the step portion 121 are in contact with each other. The effect is synergistically improved. In addition, the connection strength between the outer diameter portion 102 and the inner diameter portion 101 is ensured regardless of the rotation position of the wheel 1.

  Thus, even if the fitting length in the axial direction between the large diameter portion 105 and the large diameter concave portion 107 and the fitting length in the axial direction between the small diameter portion 106 and the small diameter concave portion 108 are short, The connection strength with the outer diameter portion 102 is ensured. Therefore, it is possible to provide a crawler traveling device in which the connecting strength between the inner diameter portion 101 and the outer diameter portion 102 is strong while the roller 1 is configured to be compact and light weight.

[About another embodiment]
(1) In the above-described embodiment, in the inner diameter portion 101, the large diameter portion 105 is formed on the outside and the small diameter portion 106 is formed on the inside, and in the outer diameter portion 102, the large diameter recess 107 is formed on the outside and the small diameter portion is formed. The example which formed the recessed part 108 inside was shown. However, the present invention is not limited to this. Although not particularly illustrated, in the inner diameter portion 101, the small diameter portion 106 is formed on the outside and the large diameter portion 105 is formed on the inner side, and in the outer diameter portion 102, the small diameter recess portion 108 is formed on the outside and the large diameter recess portion 107 is formed. You may form inside. That is, in the axial direction, the small-diameter portion 106 is formed so as to be positioned closer to the central portion of the shaft member 9 than the large-diameter portion 105, and the small-diameter concave portion 108 is formed closer to the central portion of the shaft member 9 than the large-diameter concave portion 107. You may form so that it may be located in the side.

  In this case, the outer diameter portion 102 is continuous from the outer peripheral portion to the large diameter concave portion 107, and has a large diameter guide groove having at least the same width as the large diameter concave portion 107, and the outer peripheral portion is continuous from the small diameter concave portion 108, and at least the small diameter concave portion And a small-diameter guide groove having the same width as 108. Accordingly, the outer diameter portion 102 is perpendicular to the axis L with respect to the inner diameter portion 101 while the large diameter portion 105 is along the large diameter guide groove and the small diameter portion 106 is along the small diameter guide groove. The large-diameter portion 105 is inserted into the large-diameter recess 107, and the small-diameter portion 106 is inserted into the small-diameter recess 108.

(2) In the above-described embodiment, the outer peripheral shape of the large-diameter portion 105 includes the protrusion 109 and the inner periphery of the large-diameter concave portion 107 so that the outer diameter portion 102 cannot rotate relative to the inner diameter portion 101. The shape is configured to include the concave portion 110, but is not limited thereto. For example, the outer peripheral shape of the large-diameter portion 105 and the inner peripheral shape of the large-diameter concave portion 107 may be polygonal shapes, elliptical shapes, or part of circular shapes, as long as they are irregularly fitted shapes. The shape may be acceptable. Furthermore, even if the outer peripheral shape of the large-diameter portion 105 and the inner peripheral shape of the large-diameter concave portion 107 are circular, and the small-diameter portion 106 and the small-diameter concave portion 108 are configured to be deformed and fitted, It is good also as a structure which stops.

(3) In the above-described embodiment, the outer peripheral shape of the small-diameter portion 106 and the inner peripheral shape of the small-diameter concave portion 108 are configured to be substantially the same circular shape, but are not limited thereto. For example, the outer peripheral shape of the small-diameter portion 106 and the inner peripheral shape of the small-diameter concave portion 108 are such that the outer-diameter portion 102 cannot rotate relative to the inner-diameter portion 101 when the small-diameter portion 106 is fitted into the small-diameter concave portion 108. It may be formed in a shape (a shape that is irregularly fitted). For example, the outer peripheral shape of the small-diameter portion 106 and the inner peripheral shape of the small-diameter concave portion 108 may be a polygonal shape, even if the protruding portion or the concave portion is provided, like the large-diameter portion 105 and the large-diameter concave portion 107. Alternatively, it may be an elliptical shape or a shape obtained by cutting out a part of a circular shape.

(4) In the above-described embodiment, the outer peripheral shape of the large diameter portion 105 and the inner peripheral shape of the large diameter concave portion 107 are the same, and the outer peripheral shape of the small diameter portion 106 and the inner peripheral shape of the small diameter concave portion 108 are the same. As a shape, the large diameter portion 105 and the large diameter concave portion 107 are configured to contact with each other in the circumferential direction, and the small diameter portion 106 and the small diameter concave portion 108 are configured to contact with each other in the circumferential direction. It is not a thing. The large-diameter portion 105 and the large-diameter recess 107 may partially contact in the circumferential direction, and the small-diameter portion 106 and the small-diameter recess 108 may partially contact in the circumferential direction.

  The present invention can be applied to a crawler traveling device for a working machine such as a combiner or a crawler traveling device used in place of a rear wheel such as a tractor.

DESCRIPTION OF SYMBOLS 1 Rolling wheel 2 Traveling machine body 3 Drive sprocket (drive wheel)
4 Track frame 7 Crawler belt 9 Shaft member 101 Inner diameter portion 102 Outer diameter portion 105 Large diameter portion 106 Small diameter portion 107 Large diameter recess 108 Small diameter recess

Claims (6)

A driving wheel that is supported by the traveling machine body and receives driving force;
A track frame supported by the traveling machine body;
A shaft member rotatably supported by the track frame;
A roller wheel coupled to the shaft member and rotating integrally with the shaft member;
A crawler belt wound around the drive wheel and the wheel, and provided.
The roller is separable into an inner diameter portion connected to an end portion of the shaft member and an outer diameter portion connected so as to be detachable with respect to the inner diameter portion,
A large diameter portion and a small diameter portion are formed in a step shape along the axial direction of the shaft member in the inner diameter portion,
A crawler traveling device in which a large-diameter recess into which the large-diameter portion is inserted and a small-diameter recess into which the small-diameter portion is inserted are formed in the outer diameter portion in a step shape. The outer diameter portion is connected to the inner diameter portion so as to be detachable along the axial direction,
The large diameter portion is located on the central portion side of the shaft member in the axial direction, and the small diameter portion is located on a side farther from the central portion than the large diameter portion in the axial direction. The crawler traveling device according to claim 1.   3. The crawler traveling device according to claim 1, wherein when the outer diameter portion and the inner diameter portion are coupled, the large diameter portion and the large diameter concave portion are in contact with each other in a circumferential direction.   The crawler traveling device according to any one of claims 1 to 3, wherein when the outer diameter portion and the inner diameter portion are connected, the small diameter portion and the small diameter concave portion are in contact with each other in a circumferential direction.   The outer peripheral shape of the large-diameter portion and the inner peripheral shape of the large-diameter recess are such that the outer-diameter portion cannot be rotated relative to the inner-diameter portion when the large-diameter portion is fitted into the large-diameter recess. The crawler traveling device according to any one of claims 1 to 4, wherein the crawler traveling device is set in a simple shape.   The outer peripheral shape of the small-diameter portion and the inner peripheral shape of the small-diameter concave portion are set so that the outer-diameter portion cannot be rotated relative to the inner-diameter portion when the small-diameter portion is fitted into the small-diameter concave portion. The crawler traveling device according to any one of claims 1 to 5.

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