JP4880402B2 - Crawler type traveling device - Google Patents

Description

  The present invention relates to a crawler type traveling device including a tension wheel that applies a tension force to a crawler belt.

The tension wheel is switched between an operation position for applying tension force to the crawler belt and a non-operation position for releasing the tension force by driving the tension wheel with a screw shaft or a cylinder rod (patent) References 1 and 2).
In addition, the structure of the grounding roller for guiding the crawler belt is such that the boss part of the grounding wheel is fitted and attached to the support shaft extending from the track frame via two bearings, and the left and right ends of the boss part A large-diameter right and left ground contact rolling part is erected from the part (Patent Document 2).

JP-A-10-16839 (paragraph number [0015] and FIG. 1) JP 2005-335614 A (paragraph number [0015] and FIGS. 2 and 5)

In order to release the tension force from the tension wheel, the tension wheel can be configured with a small diameter so that it does not interfere with the ground contact wheel located at the end when the tension wheel is moved to the non-operating position (patented) Document 1), the grounding wheel is positioned forward from the non-acting position of the tension wheel (Patent Document 2).
In the case described above, if the tension wheel has a small diameter, the guide angle of the crawler belt at the tension wheel cannot be sufficiently secured, and the crawler belt is bent at a steep angle, and the crawler belt may be easily damaged.
Further, when the distance between the tension wheel and the grounding wheel is large, there is a problem that the number of grounding wheels to be installed is reduced and the grounding length of the crawler belt cannot be secured sufficiently.
Considering these points, if the configuration is such that the tension wheel has a large diameter and is arranged close to the grounding wheel, when the crawler belt is removed for maintenance, the tension by the tension wheel In order to release the force, it would be difficult to retreat the tension wheel to the grounding wheel side, so that measures such as removal of the tension wheel were required, and there was a possibility that the work would be complicated.

  An object of the present invention is to provide a crawler type traveling device that can be moved to a non-operating position without removing the tension wheel by devising the arrangement relationship between the tension wheel and the grounding wheel.

〔Constitution〕
The characteristic configuration of the invention according to claim 1 is that the tension wheel that applies a tension force to the crawler belt guided by the grounding wheel is divided into an action position that applies the tension force and a non-action position that releases the tension force. It is configured to be switchable, and the boss portion of the grounding wheel is pivotally supported on the body frame, so that the grounding wheel is supported so as to be freely rotatable, and is externally supported by the support shaft of the grounding wheel. A pair of large-diameter grounding wheel portions are formed on the boss portion, and the tension wheel is moved between the both grounded wheel portions so as to be positioned between the both grounded wheel portions, so that the tension wheel is non-actuated. The boss portion that is configured to be positioned at a position and is externally supported with respect to the support shaft in the grounded rolling wheel is positioned on both sides of the intermediate small diameter portion and the intermediate small diameter portion, and the outer diameter of the intermediate small diameter portion Larger outside diameter Vital wherein constituted by a large diameter bearing holding portion having an inner diameter larger than the inner diameter of the intermediate small-diameter portion, said from the end portion on the side of the intermediate small-diameter portion of each of the large-diameter bearing holding portion is located a large diameter bearing retaining part Extending the disk-shaped base end toward the outside in the radial direction, extending the grounding wheel part from the tip of each base end in the laterally outward direction of the grounding wheel and the axial direction of the support shaft, The distance between the both grounded wheel parts is larger than the width of the tension wheel, and the side surface located between the both grounded wheel parts of the base end portion on the lateral outer side of the fuselage of the base end parts, and the side The outer peripheral surface of the intermediate small-diameter portion is connected by a curved surface having an arc-shaped cross section to form a laterally outer corner portion, and between the both grounded rolling wheel portions of the base end portion on the inner side of the fuselage side of the base end portions. the side of the side surface located and the intermediate small-diameter outer peripheral surface of the are connected by an arcuate cross section curved in the transverse Corner portion is formed, the airframe lateral outside of the large-diameter bearing retaining part of the center in the vehicle body width direction said two large-diameter bearing retaining part between the lateral outer corners and the lateral inner corners supported The distance from the center in the lateral width direction of the bearing on the lateral outer side held between the shafts to the end between the both grounded rolling wheels is large from the center in the lateral direction of the fuselage to the lateral inner side of the large-diameter bearing holding part. The laterally outer bearing and the laterally inner bearing are set so as to be larger than the distance to the end of the laterally inner bearing held between the radial bearing holding part and the support shaft between the grounded rolling parts. Is disposed asymmetrically in the lateral direction of the aircraft with respect to the center in the lateral direction of the fuselage, and the end of the laterally outer bearing between the grounded rolling parts is more than the laterally lateral end of the laterally outer corner. The lateral outer side is located on the lateral outer side of the aircraft. The effect of this is as follows.

[Action]
As the grounding wheel is configured to have a boss part fitted on the spindle and a pair of large-diameter grounding wheel parts standing on the boss part, there is a space between the two large-diameter grounding wheel parts. A space is formed. Focusing on this point, the tensioning wheel is inserted between the large-diameter grounded rolling parts at the non-operating position.

〔effect〕
As a result, the tension force of the crawler belt can be sufficiently released, the tension wheel does not need to be removed, and the grounding wheel and the tension wheel can be arranged in the proximity of the large-diameter tension wheel. It was.

[Function and effect]
The boss part is composed of two parts, and the part holding the bearing can be formed in an empty space part inside the large-diameter grounding wheel part, the bearing holding part also has a large diameter, and The intermediate small diameter portion positioned between the two large diameter grounding wheel portions is configured to have a small diameter so that the tension wheel can easily enter between the large diameter grounding wheel portions.
Thus, since the diameter of the portion holding the bearing could be increased, the diameter of the boss portion could be reduced without changing the specifications of the bearing.
A characteristic configuration of the invention according to claim 2 is the invention according to claim 1, wherein the ground contact width of the ground rolling wheel part outside the fuselage of the both grounded rolling wheel parts is the same as that of the both grounded rolling wheel parts. This is in the point that it is set wider than the ground contact width of the ground rolling part on the inner side of the fuselage.
The characteristic configuration of the invention according to claim 3 is the invention according to claim 1 or 2, wherein in the invention according to claim 1 or 2, the thickness in the radial direction of the grounded rolling wheel of the grounded rolling part laterally outside the fuselage of the both grounded rolling parts, The thickness of the grounded rolling part on the inner side of the fuselage of the both grounded rolling parts is set to be thicker than the thickness in the grounded rolling radial direction.
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the support shaft protrudes laterally outward from the track frame and extends laterally outward from the track frame. A boss portion of the grounding wheel is fitted and supported on a cantilever portion of the support shaft that protrudes toward the support shaft, and a pair of front and rear support rods extend laterally from the track frame. A support base of the tension ring is connected to the extended end.

  A crawler type traveling device used for a combine will be described. Although the crawler type traveling device is a pair of left and right, here, the crawler type traveling device on the left side will be described. As shown in FIGS. 1 and 2, the crawler type traveling device includes a track frame 2 that can be moved up and down with respect to the body frame 1, a grounding wheel 3 attached to the track frame 2, and a grounding wheel 3. The driving wheel 4 is disposed on the front side of the machine body, the tension wheel 5 is disposed on the rear side of the machine body of the grounding wheel 3, and the carrier wheel 6 is disposed above the grounding wheel 3, and is wound around each wheel body. The crawler belt 7 and a lifting device 8 for the track frame 2 are provided.

  Here, the elevating drive structure of the crawler traveling device will be described. As shown in FIGS. 1 and 2, the lifting device 8 is provided with a pair of front and rear lifting cylinders 9, 10 on the body frame 1, and a front-back swing link between the lifting cylinders 9, 10 and the track frame 2. Equipped with mechanisms 11 and 12.

The front swing link mechanism 11 will be described. As shown in FIGS. 1 and 2, the front swing link mechanism 11 includes a front turning shaft 11A supported by the body frame 1 in a state of penetrating the body frame 1 sideways, and a body frame of the front turning shaft 11A. A first swinging link 11B attached to the inner end protruding from the center of the vehicle body 1 in the lateral direction in the body width in a state of being integrally rotated, and a front rotating shaft 11A
The second swing link 11 </ b> C is attached to the outer end of the body frame 1 so as to rotate integrally with an outer end that protrudes outward from the body width direction.

The second swing link 11 </ b> C is pin-connected to a boss portion 2 </ b> A that is attached and fixed to the track frame 2, and drives the track frame 2 to be swingable relative to the body frame 1. The first swing link 11 </ b> B is connected to a front lifting cylinder 9 attached and fixed to the inward surface of the machine body frame 1, and is driven to swing by the front lifting cylinder 9.
With the above-described configuration, the front swing link mechanism 11 can swing the front end of the track frame 2 up and down around a connection point with the track frame 2 of the rear swing link mechanism 12 described later.

  The rear swing link mechanism 12 will be described. As shown in FIGS. 1 and 2, the rear swing link mechanism 12 includes a rear rotating shaft 12A supported by the body frame 1 in a state of penetrating the body frame 1 sideways, and a body of the subsequent rotating shaft 12A. A third swinging link 12B attached to the inner end projecting from the frame 1 toward the center side in the body width direction and an outer end projecting outward from the body frame 1 of the body frame 1 of the rear turning shaft 12A. The fourth swing link 12C is attached in a state of rotating integrally with the fourth swing link 12C, and the fifth swing link 12D is connected to the tip of the fourth swing link 12C.

The fifth swing link 12 </ b> D is pin-connected to a boss portion 2 </ b> B attached and fixed to the track frame 2, and drives the track frame 2 so as to be swingable relative to the body frame 1. The third swing link 12 </ b> B is connected to the rear elevating cylinder 10 that is attached and fixed to the inward surface of the body frame 1, and is then driven to swing by the elevating cylinder 10.
With the above configuration, the rear swing link mechanism 12 can swing the rear end of the track frame 2 up and down around the connection point of the front swing link mechanism 11 with the track frame 2.

  If the amount of elevation of the link mechanisms 11 and 12 with respect to the track frame 2 is set to be the same by the front and rear swing link mechanisms 11 and 12, the track frame 2 will rise and fall in parallel. If the raising and lowering amounts of the link mechanisms 11 and 12 with respect to the track frame 2 are set to different amounts, the track frame 2 is raised and lowered while being inclined in the front-rear direction.

  In the above description, the left crawler type traveling device has been described. However, a lifting drive mechanism of the same specification is also provided in the right crawler traveling device. Accordingly, when the left and right front / rear swing link mechanisms 11 and 12 are lifted and lowered by a certain amount, the aircraft can be lifted in parallel, and if the left and right front / rear swing link mechanisms 11 and 12 are set to different lift amounts, the aircraft is moved left and right. Can be rolling-operated.

The grounding wheel 3 will be described. There are four grounding rollers 3 in the front and back, two in one set, two in total, and two sets of front and rear two front and first grounding wheels and rear two seventh and eighth grounding wheels. Ground wheel 3
Is configured as a fixed roller 3A. The middle four sets of the third to sixth grounding rollers 3 are configured as swinging rollers 3B.

A mounting structure of the swinging wheel 3B from the third grounded wheel to the sixth grounded wheel will be described. As shown in FIGS. 1 and 2, the track frame 2 penetrates the support boss laterally, and the swing shaft 13 is inserted into and supported by the support boss, and the swing shaft 13 protrudes laterally outward.
On the other hand, an intermediate body frame 3a that is fitted around the swing shaft 13 and swings about the axis of the swing shaft 13 is provided, and a boss portion that is fitted around the swing shaft 13 as the intermediate body frame 3a and the boss. It is formed by integrally connecting bearing portions arranged before and after the portion. A pair of left and right large-diameter roller portions 3b are pivotally supported with respect to the two front and rear bearing portions, respectively, so as to be freely rotatable.

  With the above-described configuration, the pair of front and rear swing rollers 3B and 3B swing back and forth integrally with the intermediate body frame 3a around the axis of the swing shaft 13, while the individual wheels 3B are intermediate body frames. 3a is configured to rotate around the lateral axis of the bearing portion constituting a part of 3a. As a result, the two sets of swinging rollers 3B and 3B positioned in the middle can swing about the axis of the swinging shaft 13 for each set.

  As shown in FIG. 1 and FIG. 2, a flange portion having a certain lateral width is provided at the lower end portion of the intermediate body frame 3 a, and this flange portion is a pair of left and right core metal protrusions 7 a and 7 a of the crawler belt 7. The swing crawler guide 3D is configured so that the swing roller 3B is not removed from the crawler belt 7 in the middle.

  Next, the mounting structure of the fixed wheel 3A as the first and second grounded wheels and the seventh and eighth grounded wheels will be described. As shown in FIGS. 1 and 3, the support boss 2C is horizontally attached to the track frame 2 and fixed, and the support shaft 15 for individually supporting the fixed rolling wheels 3A is inserted into the support boss 2C. It is supported and protruded laterally from the support boss 2C.

  As shown in FIG. 3, the spindle 15 has a large-diameter portion 15A at an intermediate position. The spindle 15 is supported by the support boss 2C in a state where one end of the large-diameter portion 15A is in contact with one end of the support boss 2C. The insertion support state of the support shaft 15 relative to the support boss 2C can be positioned by inserting and supporting the support shaft 15. On the side opposite to the one end of the support boss 2C, a positioning plate 16 is bolted and fixed to the end of the support shaft 15. The positioning plate 16 abuts on the opposite end of the support boss 2C, and the large The support shaft 15 is positioned with respect to the support boss 2C in cooperation with the diameter portion 15A.

  As shown in FIG. 3, two bearings 14 and 14 are fitted on the cantilever portion of the support shaft 15 which protrudes from the support boss 2 </ b> C toward the laterally outer side of the machine body with a predetermined interval. . The bearing 14 near the support boss 2 </ b> C is positioned in contact with one end of the large-diameter portion 15 </ b> A of the support shaft 15. A fixed rolling wheel 3A as will be described later is externally fitted to the cantilever portion.

As shown in FIG. 3, the fixed roller 3 </ b> A includes a boss portion that is externally supported by the support shaft 15, and a large-diameter bearing holding portion 3 d that is located on both sides of the intermediate small-diameter portion 3 c and the intermediate small-diameter portion 3 c. The disk-shaped base end portions 3f and 3f extend outward in the radial direction from the boundary position between the large-diameter bearing holding portion 3d and the intermediate small-diameter portion 3c, and the base end portions 3f and 3f The large-diameter grounding wheel portions 3e and 3e that are parallel to the axial direction of the support shaft 15 are formed from the tip of the shaft.
The boss portion is provided with a through-hole through which the support shaft 15 is inserted, and the large-diameter bearing holding portion 3d described above is provided at both end portions of the through-hole. From the joint part of the base end part 3f and the intermediate | middle small diameter part 3c to support, it is extended in the cantilever shape in parallel with the grounding-rolling-wheel part 3e.

The large-diameter bearing holding portion 3d has a holding portion having a diameter larger than that of the through hole, and is configured to hold the bearing 14, the oil seal 28, and the like. A step portion is formed between the through hole and the holding portion, and when the fixed roller 3A is externally fitted to the bearings 14 and 14, the step portion abuts on the corner of the bearing, and the fixed roller 3A is positioned. It has become so. The laterally outer bearing 14 and the laterally inner bearing 14 are corner portions K formed by the side surface located between the ground contact rolling parts of the base end portion 3f on the lateral outer side of the body and the outer peripheral surface of the intermediate small diameter portion 3c. And the center C in the lateral width direction of the body between the side surface of the base end portion 3f on the lateral side of the airframe located between the grounded rolling wheels and the corner K formed by the outer peripheral surface of the intermediate small diameter portion 3c. The distance from the center C in the lateral width direction of the bearing 14 on the lateral outer side to the end 14b between the grounded rolling parts of the lateral inner bearing 14 The side 14a between the grounded rolling parts of the bearing 14 on the lateral outer side and the side surface on the side located between the grounded rolling parts of the base end 3f on the lateral lateral side of the fuselage and the intermediate small diameter part It is located on the laterally outer side of the body from the laterally outer side edge Ka of the corner K formed by the outer peripheral surface of 3c. It is location.
In the figure, 17 is a plate for preventing the bearing 14 from coming off from the support shaft 15, and 18 is a grease holding plate.

  Here, the outer diameter of the intermediate small diameter portion 3 c of the boss portion in the fixed roller 3 </ b> A that is externally fitted and fixed to the bearing 14 is substantially the same as the outer diameter of the bearing 14. On the other hand, the distance between the both grounded roller portions 3e and 3e of the fixed wheel 3A is larger than the width of the tension wheel 5 described later, and the both grounded wheel portions are in the state where the tension wheel 5 is close to the intermediate small diameter portion 3c. It becomes the structure which can enter between 3e and 3e.

The structure of the fixed roller 3A will be described in detail as follows. As shown in FIG. 3, disc-shaped base end portions 3f and 3f extending radially outward from the boss portion, and a grounding wheel portion 3e extending from the tip ends of the base end portions 3f and 3f. As for 3e, a pair of left and right is formed with the intermediate small diameter portion 3c of the boss portion interposed therebetween.
Then, the base end 3f and the grounding wheel 3e located on the laterally outer side of the body are thickened, and the wall thickness T is thicker than the base end 3f and the grounding wheel 3e located on the central side in the body width direction. In addition, the ground contact width W of the ground contact wheel 3e is widened to ensure a sense of stability during travel.
However, either one of the configurations of increasing the thickness T or increasing the ground contact width W may be adopted.

  In the figure, reference numeral 7 denotes the above-described crawler belt, and a cored bar projection 7a is raised along the base end portions of the both grounded roller portions 3e and 3e. That is, as shown in FIGS. 1 and 3, the crawler belt 7 is provided with a core metal 7 </ b> A, and the core metal 7 </ b> A is incorporated in the crawler belt 7, and is long along the traveling direction of the crawler belt 7. A rectangular shape having a short length and a long length in the width direction, and a plurality of pieces are arranged with a predetermined interval a along the traveling direction of the crawler belt 7 as shown in FIG. .

  Next, a support structure for the tension mechanism A that applies tension force to the crawler belt 7 will be described. As shown in FIGS. 4 and 5, a square pipe-shaped first support arm 19 is further extended laterally from the lateral outer surface of the track frame 2 toward the grounding wheel 3 side, and the rear side of the machine body from the extended end. The first mounting table 20 in the shape of a square pipe is extended toward. A square pipe-shaped second mounting table 21 is further extended backward on the upper surface of the first mounting table 20, and the second mounting table 21 is extended rearward from the rear end of the first mounting table 20. .

  On the other hand, the second support arm 22 extends from the upper surface of the track frame 2 toward the rear end of the second mounting table 21, and the extended end of the second support arm 22 is connected to the rear end side surface of the second mounting table 21. The first and second support arms 19 and 22 and the first and second mounting tables 20 and 21 constitute a support table that supports the tension mechanism A.

The tension mechanism A will be described. As shown in FIGS. 4 to 7, a cylinder 23 is slidably accommodated in a square pipe-shaped second mounting table 21, and the outer surface of the cylinder 23 has a rectangular cross section of the second mounting table 21. It is formed in a square cross section. If the cross-sectional shape of the second mounting table 21 is a hexagon, the outer surface shape of the cylinder 23 is a hexagonal cross-section.
A bracket 24 is formed at the rear end of the cylinder 23, and the bracket 24 is formed by forming a plate member in a channel shape, attaching a web portion to the rear end of the cylinder 23, and a flange portion extending from both ends of the web portion. The tension ring 5 is rotatably attached to and fixed to.

  As shown in FIGS. 5 and 6, the cylinder 23 forms a circular piston storage chamber 23A in a rectangular outer shape, and a small-diameter grease introduction path 23B extends from the rear end of the piston storage chamber 23A to the bracket 24. It is formed. A grease nipple 25 is attached to the grease introduction path 23B, and is configured to feed grease into the piston accommodation hole via the grease introduction path 23B.

As shown in FIGS. 4 to 7, the piston 26 is housed in the piston housing chamber 23 </ b> A, and the front end portion of the piston 26 projects from the front end of the cylinder 23 and further projects forward from the front end of the second mounting table 21. ing.
On the other hand, a stopper 27 made of an angle material is attached and fixed over the length from the upper surface of the track frame 2 to the upper surface of the first mounting table 20 via the first support arm 19. It is configured to catch the front end.

  The mechanism as described above is referred to as a tension mechanism A. By supplying grease into the cylinder 23, as shown in FIG. 5, the piston 26 abuts against the stopper 27 and the forward movement is restricted. When the grease is supplied to fill the piston storage space, the cylinder 23 protrudes rearward to apply tension to the crawler belt 7 in order to receive the further supply of grease and store the grease. Become.

  By adopting such a tension mechanism A, the number of parts can be reduced as compared with the conventional configuration. That is, in the prior art (see FIG. 3 of JP-A-8-150966), the bracket that supports the tension ring 5 and the cylinder 23 that operates with grease pressure are separate parts. As a result, the number of parts could be reduced.

  Next, the relationship between the fixed roller 3 </ b> A located at the tail of the crawler traveling device as the eighth grounded roller and the tension wheel 5 will be described. As shown in FIG. 8, tension is applied to the crawler belt 7 by supplying grease and extending the cylinder 23 and moving the tension wheel 5 backward. To release the tension force from this state, the tension wheel 5 can be moved to the front side of the machine body by extracting the grease from the piston storage chamber 23A via the grease introduction path 23B. By doing so, the tension force on the crawler belt 7 can be released.

  When releasing the tension force on the crawler belt 7, as shown in FIGS. 3 and 8 (B), the grounding wheel 5 is grounded without interfering with the boss portion of the fixed roller 3 </ b> A located at the rearmost position. It can be inserted between the rolling parts 3e, 3e. Thereby, the fixed roller 3A can be moved sufficiently forward of the machine body, and the crawler belt 7 can be sufficiently slackened. When the crawler belt 7 is sufficiently slackened, maintenance work such as replacement of the crawler belt 7 can be performed more easily.

Next, the mounting structure of the carrier wheel 6 will be described. As shown in FIGS. 1 and 9, a support pipe 29 having a circular cross section is extended from the machine body frame 1 toward the laterally outer side, and a support shaft 30 is inserted into the support pipe 29. The carrier wheel 6 is attached and supported by allowing the connection pin 31 to penetrate in the overlapping portion of the support shaft 30.
In this way, by connecting the support pipe 29 and the support shaft 30 with the connection pin 31, the support shaft 30 can be held to a length up to the middle of the support pipe 29. It is not necessary to provide the entire area, and the weight can be reduced.

  As shown in FIG. 9, the carrier wheel 6 includes a boss portion 6A supported on a support shaft 30 via two bearings 32 and 32, and a large-diameter receiving member fixed integrally to both ends of the boss portion 6A. The crawler belt 7 is supported and guided by the retaining ring portions 6B and 6B.

  The structure of the fixed crawler guide 33 for the fixed roller 3A will be described. As shown in FIGS. 1, 2, and 10, a bracket 34 extends horizontally from the lateral side surface of the track frame 2 toward the laterally outer side, and a fixed crawler guide 33 is fixed to the bracket 34 with screws. is there. The fixed crawler guide 33 includes a boss portion 33A in which screw insertion holes are formed in two upper and lower portions, a flange portion 33B having a certain lateral width contacting the crawler belt 7 below the boss portion 33A, and a boss portion 33A. It comprises a connecting frame portion 33C that integrally connects the flange portion 33B.

  The fixed crawler guide 33 is a fixed crawler guide 33 positioned on the front side disposed in the vicinity of the drive wheel 4 of the crawler traveling device, and a fixed crawler positioned on the rear side for guiding the crawler belt 7 before reaching the tension wheel 5. There is a guide 33. As shown in FIG. 10 (a), in the fixed crawler guide 33 located on the front side, the flange portion 33B is formed in a posture that is inclined forwardly upward, and the interval from the boss portion 33A to the front end of the flange portion 33B is set. The distance from the boss portion 33A to the rear end of the flange portion 33B is longer. On the other hand, as shown in FIG. 10 (b), in the fixed crawler guide 33 located on the rear side, the flange portion 33B is formed in a posture that tilts rearward and the boss portion 33A to the flange portion 33B. Is shorter than the distance from the boss portion 33A to the rear end of the flange portion 33B.

  As described above, the fixed crawler guide 33 has a different shape depending on whether it is attached to the front side or the rear side, but the front end of the rear crawler guide 33 is aligned with the rear end of the front crawler guide 33. When the front crawler guide 33 and the rear crawler guide 33 are arranged in the front-rear direction, the front crawler guide 33 and the rear crawler guide 33 are subject to the front-and-rear direction, with the position of alignment of the front end of the rear crawler guide 33 aligned with the rear end of the front crawler guide 33 It is in shape.

  Therefore, in the present invention, as the crawler guide 33, the boss portion 33A, the flange portion 33B, and the connecting frame portion 33C are provided, and the flange portion 33B is formed in a posture in which the front portion is inclined upward. The configuration in which the interval from the front end of 33B is longer than the interval from the boss portion 33A to the rear end of the flange portion 33B is maintained.

In such a configuration, the crawler guide 33 is configured in a bilaterally symmetric shape with the center of the thickness of the connecting frame portion 33C as a reference line. As shown in FIGS. 1 and 10 (a) and (b), the crawler guide 33 is used as a front crawler guide while being turned upside down. Can also be used as a side crawler guide.
Accordingly, one type of crawler guide 33 may be manufactured. When the crawler guide 33 is attached, one crawler guide 33 may be attached face up and the other crawler guide 33 may be attached face down.

  The installation interval of the fixed roller 3A will be described. As shown in FIG. 1, an installation interval L between a fixed roller 3 </ b> A that is a second grounded roller and a fixed roller 3 </ b> A that is a seventh grounded roller is an interval a between the core bars 7 </ b> A provided on the crawler belt 7. (Integer + 0.5) times. By setting such an installation interval L, neither of the first and second grounding rollers 3A reaches the cored bar 7A. Further, neither the seventh or eighth grounding wheel 3A reaches the cored bar 7A.

That is, the interval b between the first and second grounding rollers 3A and the interval b between the seventh and eighth grounding rollers 3A are set to be different from the interval a between the core bars 7A. In this state, as described above, the installation interval L between the second grounding wheel 3A and the seventh grounding wheel is set to (integer +0.5) times the space a between the core bars 7A.
Therefore, when the second grounding wheel 3A is on the core metal 7A, the seventh grounding wheel 3A is not on the core metal 7A, and when the seventh grounding wheel 3A is on the core metal 7A. The second grounding wheel 3A is not on the cored bar 7A.
With the configuration as described above, traveling stability can be ensured and traveling vibration is reduced.

[Another embodiment]
In the above-described embodiment, the outer diameter of the bearing 14 is set to be substantially the same as the outer diameter of the intermediate small diameter portion 3c. However, the intermediate small diameter portion 3c may be smaller than the outer diameter of the bearing 14. .

Side view of crawler traveling device Top view of crawler traveling device Longitudinal front view showing the fixed ground wheel installation Plan view showing tension mechanism for crawler belt Side view showing tension mechanism for crawler belt Cross-sectional plan view showing grease cylinder Perspective view showing grease cylinder (A) Side view showing a state where the tension ring is positioned at the operating position, (B) Side view showing a state where the tension ring is positioned at the non-operating position Longitudinal front view showing carrier wheel support structure (A) Side view showing the front crawler guide, (B) Side view showing the rear crawler guide

1 Airframe frame
2 track frame 3 grounding wheel 3c intermediate small diameter part 3d large diameter bearing holding part 3e grounding wheel part
3f Base end 5 Tension wheel 7 Crawler belt 14 Bearing
14a Lateral outer bearing end
14b Lateral inner bearing end 15 Support shaft
19, 22 support rod
C center
T thickness
K corner
Aircraft lateral outer edge of Ka corner
W ground width

Claims (4)

A tension ring that applies a tension force to the crawler belt guided by the grounding roller is configured to be switchable between an operation position that applies the tension force and a non-operation position that releases the tension force. By supporting the boss part on the body frame, the grounding wheel is supported so as to freely rotate, and a pair of large-diameter grounding wheels are supported on the boss part that is externally supported by the support shaft of the grounding wheel. Forming a section, and moving the tension wheel between the both grounded rolling wheel parts to be positioned between the both grounded rolling wheel parts, and configuring the tension wheel to be positioned at the non-operating position,
The boss portion that is externally supported with respect to the support shaft in the grounding wheel is positioned on both sides of the intermediate small diameter portion and the intermediate small diameter portion, and has an outer diameter larger than the outer diameter of the intermediate small diameter portion. And a large-diameter bearing holding portion having an inner diameter larger than the inner diameter of the intermediate small-diameter portion, and the large-diameter bearing holding portion of each large-diameter bearing holding portion from the end on the side where the intermediate small-diameter portion is located. A disk-shaped base end portion is extended outward in the radial direction, and the grounding wheel portion is extended from the tip of each base end portion toward the laterally outer side of the grounding wheel and the axial direction of the support shaft,
The interval between the both grounded rolling parts is larger than the width of the tension wheel,
The side surface of the base end portion on the lateral outer side of the fuselage side of the both base end portions located between the ground contact wheel portions and the outer peripheral surface of the intermediate small diameter portion are connected by a curved surface having an arcuate cross section. A corner portion is formed, and a side surface of the base end portion on the inner side of the fuselage side of the base end portion located between the ground contact wheel portions and an outer peripheral surface of the intermediate small diameter portion are arcuate in cross section. Connected with the curved surface of the inside, corners on the inside are formed,
It is held between the large-diameter bearing holding portion on the outer side of the fuselage of the large-diameter bearing holding portion and the support shaft from the center in the width direction of the fuselage between the lateral outer corner portion and the lateral inner corner portion. The distance from the center in the lateral direction of the fuselage to the end of the laterally outer bearing of the laterally outer bearing is between the large-diameter bearing retaining portion on the laterally inner side of the large-diameter bearing retaining portion and the large-diameter bearing retaining portion of the both large-diameter bearing retaining portions. The laterally outer bearing and the laterally inner bearing are arranged in the width direction of the fuselage so that the distance between the laterally inner bearing held between the support shafts and the distance between the both ends of the grounded rolling wheel portion is larger. Asymmetrical arrangement in the aircraft width direction with respect to the center of the
The crawler type in which the laterally outer bearing is arranged so that the end of the laterally outer bearing between the both grounded rolling wheel portions is located on the laterally outer side of the aircraft from the laterally lateral end of the laterally outer corner. Traveling device.   The grounding width of the grounded rolling part on the outer side of the fuselage of the both grounded rolling parts is set wider than the grounding width of the grounded rolling part on the laterally inner side of the grounded wheeled part of the both grounded rolling parts. The crawler type traveling device according to 1.   The thickness in the radial direction of the grounded rolling wheel of the grounded rolling part laterally outside the fuselage of the both grounded rolling parts is determined by the grounding wheel of the grounded rolling part of the grounded lateral side of the grounded rolling part. The crawler type traveling device according to claim 1 or 2, wherein the crawler type traveling device is set to be thicker than a thickness in a radial direction. The support shaft protrudes laterally outward from the track frame, and a boss portion of the grounding wheel is externally supported by a cantilever portion of the support shaft that protrudes from the track frame toward the lateral lateral side of the aircraft. ,
The pair of front and rear support rods are extended laterally from the track frame, and the support base of the tension wheel is connected to the extended end portion of the pair of front and rear support rods. The crawler type traveling device as described.

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