JP6541619B2 - Crawler travel device - Google Patents

Description

  The present invention comprises a track frame on which a plurality of ground contact rolling wheels are mounted, and a crawler belt guided on the ground contact side by the ground contact rolling wheels, and the track frame is connected to be able to move up and down with the machine frame. A crawler traveling device provided with a swing arm.

  In the crawler traveling device having a swing arm to move the track frame up and down, the front and rear swing arms can be moved smoothly by absorbing mounting errors of the front and rear swing arms and manufacturing errors of the swing arms. One of them is equipped with a cancel link (see Patent Document 1).

JP, 2013-169949, A (Paragraph [0038, 0040], Drawing 2-Drawing 4)

  In the structure described in the above-mentioned Patent Document 1, the other end of the first arm whose one end is connected to the track frame and the other end of the second arm whose one end is connected to the airframe And a connecting shaft for connecting the upper and lower track frames. For this reason, the upper end edge of the track frame can not move upward beyond the location where the connecting shaft is present. That is, there is room for improvement in that the rise range of the track frame is limited by the presence of the connection axis.

  According to the present invention, while adopting a structure provided with a cancel link as a swing arm, the track frame can be operated to be greatly raised, and a state in which the center of gravity of the vehicle body is sufficiently lowered can be obtained.

  The features of the crawler traveling device according to the present invention include a track frame on which a plurality of ground contact rolling wheels are mounted, and a crawler belt guided by the ground contact rolling wheels on the ground contact surface side, the track frame extending in the front and rear direction A swing arm is configured by stacking a plurality of components in a plurality of upper and lower stages, and the track frame is connected to be able to move up and down with respect to the body frame. The swing arm pivots the lower part to the track frame. And a second arm connected across the upper portion of the first arm and the body frame, wherein the first arm and the second arm have a transverse axis along the lateral direction. And the connection shaft is inserted into the vertical width of the track frame. Possible notches is that is formed.

According to the present invention, since the cutaway portion into which the connecting shaft connecting the first arm and the second arm can be formed is formed within the width of the track frame in the vertical direction, the track frame is at the highest position. Also when raised, there is no possibility that the upper limit of the track frame is limited by the presence of the connecting shaft.
Therefore, the track frame can be raised to a position as close as possible to the airframe frame, and there is an advantage that it is easy to obtain a low airframe center of gravity.

  In the present invention, the lower portion of the swing arm corresponding to the connection point to the track frame is pivoted to the lower frame component positioned at the lowermost stage among the plurality of frame components constituting the track frame. It is preferable that the notches be connected to each other and be formed in the frame component positioned above the lower frame component.

By including this configuration, it is easy to maintain the state where the connection between the first arm and the track frame is directly below the connecting shaft while locating the connecting shaft in the notch in the vertical width of the track frame. . As a result, there is no need to reposition the connecting point between the first arm and the track frame before and after the connecting shaft in order to locate the connecting shaft in the notch within the vertical width of the track frame.
Therefore, it is possible to easily avoid the generation of an acting force for moving the position in the front-rear direction at the connection point between the first arm and the track frame in the process of raising and lowering the connection shaft by the second arm.

  In the present invention, in the frame component in which the notched portion is formed, the front frame portion located on the front side of the notched portion and the back frame portion located on the rear side of the notched portion It is preferable that the frame portion and the rear frame portion be connected by a reinforcing member installed on the upper side of the cutout portion in a state of being extended.

  By providing this configuration, the cut-out portion can be easily configured simply by providing a space between the front frame portion and the rear frame portion.

  In the present invention, a bracket side plate fixed to the side portion of the reinforcing member and the side portion of the track frame along the periphery of the notch is provided, and the lower side of the first arm is the track frame It is preferable that a lower support shaft to be connected is supported by the lower frame component via the bracket side plate.

  By providing the bracket side plate fixed to the side portion of the reinforcing member and the side portion of the track frame in a state along the periphery of the notched portion by providing this configuration, it is easy to ensure the strength around the notched portion It is.

  In the present invention, the upper portion of the first arm is positioned above the lower frame component, and the connecting shaft extends in the lateral direction of the lower frame component relative to the lower frame component, and the second arm Is located on the vehicle body side in the lateral direction relative to the lower frame component, and one end of the second arm is the connection shaft of a portion located on the vehicle body in the lateral direction than the lower frame component Preferably, the other end of the second arm is pivotally supported by the body frame on the inboard side of the lower frame component in the left-right direction.

According to this configuration, since the second arm is supported in a cantilevered manner by the connecting shaft of the portion projecting toward the inside of the machine, for example, the second arm is formed in a bifurcated shape straddling the track frame. As compared with the above-mentioned structure, it is possible to provide the track frame without disturbing the rising range.
Therefore, it is easier to raise the track frame closer to the airframe frame.

  In the present invention, in the frame component in which the cutaway portion is formed, the front frame portion positioned on the front side of the cutaway portion and the rear frame portion positioned on the rear side of the cutaway portion have a tubular shape or A front closing plate which is formed in a groove shape having a downward opening, and the notch is formed by separating the front frame portion and the rear frame portion, and closing the rear end of the front frame portion; Preferably, a rear closing plate is provided which closes the front end of the frame portion.

  With this configuration, the cutaway portion can be easily structured using a tubular or downward opening groove-shaped frame component, and a structure that easily prevents the entry of mud using the front closing plate and the rear It is easy to obtain.

  In the present invention, the swing arm is one swing arm pivotally connected to the lower frame component on the front side or rear side of the track frame, and the lower frame component on the rear side or front side of the track frame. And the other inner side swing arm pivotally connected to the upper frame component, and the upper inner peripheral side of the crawler belt at an end of the other swing arm on the body frame side of the other swing arm. A recessed portion on which the support shaft of the upper rolling ring for guiding the upper wheel is mounted and which allows the shaft portion of the upper rolling ring to enter the upper surface side of the upper frame constituent material positioned at the highest position among the frame components. Is preferably formed.

  By providing this configuration, a recessed portion which allows the shaft portion of the upper wheel to enter is formed on the upper surface side of the upper frame component located at the highest position among the frame components, so that the upper rolling It is easy to make the track frame as close as possible to the machine frame while avoiding interference with the support shaft of the wheel.

  In the present invention, it is preferable that an end of the other swing arm on the track frame side is pivotally connected to the upper frame component.

  By providing this configuration, the track frame side end of the other swing arm can be set as close to the airframe as possible, so that the track frame swings even if the other swing arm with a short swing radius is used. It is easy to secure a large range.

  In the present invention, at an intermediate position in the front-rear direction of the track frame, a guide ring is provided which enters between the guide projections formed on the crawler belt and restricts lateral movement of the crawler belt; It is preferable that a plurality of the ground contact rolling wheels are provided on the front side and the rear side of the guide ring, respectively.

  By providing this configuration, the crawler belt is easily elastically deformed without being restricted by the dedicated detachment prevention guide before and after the guide ring present at the intermediate position in the front and rear direction of the track frame, It is easy to reduce the impact accompanying the attitude change of the traveling aircraft at the time.

  In the present invention, the guide ring is located within the lateral width of the track frame in the left-right direction, and a part of the guide ring is located in the frame component above the lower frame component. In the state of entering, the guide is provided at each of the front portion and the rear portion facing the induction wheel among the frame components which are pivotally supported by the lower frame component and located above the lower frame component. It is preferable that a shielding plate for suppressing the scattering of mud from the wheel side is provided.

  With this configuration, even if a relatively large guide ring extending between the lower frame component and the frame component located on the upper side is used, it is easy to suppress the scattering of the mud on the frame component by the shielding plate.

  In the present invention, the plurality of ground contact rolling wheels are pivotally supported by the lower frame component, and at the lower end side of the lower frame component, a portion corresponding to between the bearing portions of the ground contact wheels. A reinforcing plate is provided which is formed in a corrugated shape so as to close the lower side and to bypass the upper side of a portion corresponding to the pivotally supporting portion of the ground roller, and a front end portion and a rear end of the lower frame component Preferably, each of the parts is closed by an end closing plate.

  By providing this configuration, the lower side of the lower frame component, the front end and the rear end are reinforced, and it is easy to suppress the intrusion of mud.

  In the present invention, there is provided a tension ring for pressing and urging the crawler belt toward the tension side, and an adjustment rod for adjusting the pressing force of the tension ring is disposed on the upper side of the track frame. It is preferable that the tension wheel be disposed on an extension line of

  By providing the present configuration, the adjustment operation from the adjustment rod to the tension wheel can be easily performed smoothly in a state where the tension wheel is less distorted and the like.

It is a left view which shows the whole combine. It is a left side view showing a crawler traveling device. It is sectional drawing in the horizontal direction in the crawler travel apparatus of the left side. It is sectional drawing in the up-down direction in the front part of the crawler traveling device on the left side. FIG. 5 is a front view showing a V-V line portion in FIG. 4 in cross section. It is a sectional view in the up-and-down direction in the rear of a crawler traveling device on the left side. It is a top view which shows a tension ring and a tension adjustment mechanism. It is a left view which shows the bracket side plate of another embodiment. It is explanatory drawing which shows the reinforcement plate of another embodiment. It is explanatory drawing which shows the positional relationship of the guide wheel and rolling wheel in another embodiment.

Hereinafter, an example of an embodiment of the present invention will be described based on the description of the drawings.
In the description of the present embodiment, the front-rear direction and the left-right direction are described as follows, unless otherwise specified. That is, the forward traveling direction (refer to arrow F in FIG. 1) in the working travel of the work machine according to the present invention is “front”, and the traveling direction to reverse (the arrow B in FIG. 1) is “rear”. . Then, it is described that the direction corresponding to the right side with respect to the forward posture in the front-rear direction is "right" and the direction corresponding to the left side is "left".

[Overall configuration of work machine]
FIG. 1 shows a full-brows-through type (ordinary type) combine which is an example of a working machine to which a crawler traveling device 2 according to the present invention is applied. FIG. 1 shows the left side of the entire machine.

The above-described full-scale insert type combine is provided with a pair of left and right crawler traveling devices 2 below the body frame 1.
A crop processing device 10 for crop harvesting is provided on the front side of the machine frame 1 and the crop cropped by the crop processing device 10 is carried by the feeder 11 to the threshing device 12 on the rear side. The threshing device 12 threshs and sorts the imported crop. The grain after threshing and sorting is transported and stored toward the grain tank 13 provided on the right lateral side of the threshing device 12 on the airframe frame 1. The grain stored in the gren tank 13 is configured to be able to be taken out of the machine by a well-known grain unloading device 14.

  A driving cabin 15 is installed at the front of the fuselage frame 1 so as to be positioned forward of the threshing device 12 and the gren tank 13. An engine (not shown) is disposed on the lower body frame 1 of the driving cabin 15. The output of the engine is transmitted to the crawler traveling device 2, the crop processing device 10, the threshing device 12, the grain unloading device 14 and the like via a transmission mechanism (not shown).

Crawler travel device
The pair of left and right crawler traveling devices 2 are configured substantially symmetrically on the left and right with respect to a center line (not shown) in the front-rear direction of the traveling vehicle body. Therefore, the description of the crawler traveling device 2 on the right side is omitted here, and the configuration of the crawler traveling device 2 on the left side illustrated will be described based on FIGS. 2 to 7.

As shown in FIGS. 2 and 3, the crawler traveling device 2 includes a drive sprocket 17 integrally provided on a drive shaft 16 pivotally supported at the front end of the machine body frame 1. Is configured to be transmitted to the crawler belt 20.
The crawler belt 20, together with the drive sprocket 17, is provided with a large number of contact rolling wheels 21 attached to the lower part of the track frame 3, an upper rolling wheel 27 provided on the upper side of the track frame 3, and a rear end side of the track frame 3. It is wound around a tensioning wheel 5 attached.

The ground roller 21 has a group of three ground wheels 21 provided on the front side of the track frame 3 and a group of five ground wheels 21 provided on the rear side of the track frame 3. The induction wheel 24 is provided between the group of the ground contact rolling wheels 21 on the front side thereof and the group of the ground contact rolling wheels 21 on the rear side thereof.
As shown in FIG. 3, while each of the above-mentioned ground contact rolling wheels 21 is provided so as to protrude on both sides of the track frame 3, the guide ring 24 overlaps the track frame 3 in plan view. It is fixed to This is because the crawler belt 20 has a pair of left and right disengagement core metal protrusions 20a (corresponding to guide protrusions) formed on the inner peripheral side so as to protrude from the inner peripheral side, and the contact rolling wheel 21 with the core metal protrusion 20a This is because the arrangement positions in the left-right direction with the guide ring 24 are made different. In other words, each of the ground contact rolling wheels 21 is disposed so as to abut on the inner peripheral surface of the crawler belt 20 at a position deviated to the inner side and the outer side in the left-right direction with respect to the metal core protrusion 20a. Is provided on the lower side of the track frame 3 and disposed so as to be located between the left and right core metal projections 20a and 20a.

Although not shown, the crawler belt 20 has a large number of core metal plates (not shown) integrally provided with left and right core metal protrusions 20 a, embedded at predetermined intervals in the circumferential direction of the crawler belt 20. It is Most of the metal core plate is buried in the thickness of the belt of the crawler belt 20, and the portions of the metal core projections 20a and 20a project to the inner peripheral side of the crawler belt 20.
Further, an engagement recess (not shown) is formed between the left and right core metal projections 20a and between the front and rear core metal plates, with which the drive claws 17a of the drive sprocket 17 engage. The drive claws 17a of the drive sprocket 17 are engaged with the engagement holes to drive and rotate the crawler belt 20.
The tension wheel 5 is also disposed between the left and right core metal protrusions 20a and 20a, and this tension wheel 5 also performs positional deviation and separation prevention in the left-right direction of the crawler belt 20. It has a function.
The upper roller 27 is disposed to abut on the inner peripheral surface of the crawler belt 20 at a position deviated to the inner side and the outer side in the left-right direction with respect to the metal core protrusion 20a, similarly to the ground roller 21.

[Track frame]
Of the crawler traveling device 2, the track frame 3 connected so as to be capable of moving up and down via a swing arm 4 to be described later is configured as follows.
That is, the track frame 3 is configured by stacking a plurality of frame components extending in the front-rear direction in upper and lower stages, and the lower frame component 30 at the lowermost stage for supporting the ground rolling wheel 21 and its lower part And an upper frame component 31 located on the upper side of the frame component 30.
Each of the lower frame component 30 and the upper frame component 31 is formed of a groove-shaped channel-shaped member whose lower side is opened, and the lower open end of the upper frame component 31 is used as the lower frame component It is stacked and welded and fixed in a state of being closed by the upper surface 30 a of 30.

In the lower frame component 30, as shown in FIGS. 4 to 6, cylindrical cylindrical bosses 33 supporting a large number of ground contact wheels 21 extend over the left and right side walls 30b, 30b of the lower frame component 30. It is provided. The cylindrical boss 33 is welded and fixed to the left and right side walls 30b and 30b in a state in which the upper half side enters a semicircular recessed portion formed on the upper side of the lower edges of the left and right side walls 30b and 30b. There is. The lower half sides of the left and right side walls 30b, 30b are provided to project downward from the lower edges of the left and right side walls 30b, 30b.
The shaft portion 21 a of each of the ground contact rolling wheels 21 is rotatably supported by the cylindrical boss 33 via a bearing (not shown).

The lower frame component 30 is provided with a structure for mounting the induction wheel 24 in addition to the cylindrical boss 33 supporting the above-described ground contact roller 21. That is, as shown in FIG. 4, a semicircular recessed portion 30c into which the pivot support member 24b rotatably supported by the attachment shaft 24a of the induction ring 24 is inserted at the lower half of the left and right side walls 30b, 30b. The opening 30d is formed to allow the upper portion of the guide ring 24 to protrude upward.
A mounting shaft 24 a of the guide ring 24 is supported by a mounting plate 25 mounted in contact with both left and right sides of the track frame 3. As a result, the guide ring 24 overlaps the track frame 3 in a plan view, and is positioned between the left and right core metal protrusions 20a, 20a.
The semicircular recessed portion 30c is notched a little deeper to the upper side than the radius of the shaft support member 24b, and is configured such that some vertical adjustment of the guide ring 24 relative to the track frame 3 is possible. ing. The size of the opening 30 d on the upper surface side of the lower frame component 30 is also formed to a size that allows the protrusion of the guide ring 24 due to the adjustment of the position of the guide ring 24 to the upper side. Further, an end reinforcing plate 30 e is provided at the front end and the rear end of the lower frame component 30.

The lower edge of the guide wheel 24 is mounted at a position higher than the lower edge of the ground contact wheel 21 when the bearing member 24b of the guide wheel 24 is positioned on the back side (upper side) of the recessed portion 30c. It becomes a state. In this state, the lower edge of the guide wheel 24 tends to be located away from the inner circumferential surface of the crawler belt 20 that is guided in contact with the ground contact roller 21.
That is, although the guide ring 24 is positioned between the left and right core metal protrusions 20 a and 20 a and maintains the function of preventing the crawler belt 20 from coming off due to lateral displacement, the guide ring 24 strongly abuts the inner circumferential surface side of the crawler belt 20. It is possible to reduce the progress of the wear of the crawler belt 20 as in the case of contact.
Further, the guide ring 24 is provided at the middle portion of the track frame 3 in the front-rear direction, but the position of the guide ring 24 corresponds to a position close to immediately below the center of gravity in the front-rear direction Do. Therefore, when the full-throw-in type combine performs over-the-row, etc., areas s1 and s2 (see FIG. 2) in which the bending deformation of the crawler belt 20 is possible are secured at places before and after the guide wheel 24 It is easy to reduce the impact accompanying the attitude change of the airframe from the backward lean posture to the forward lean posture in.

In other words, between the ground contact rolling wheels 21 on the front side of the induction ring 24 and between the ground contact rotation wheels 21 on the rear side of the guide ring 24, as shown by phantom lines in FIGS. A detent guide 26 is fixedly coupled to the lower frame component 30. For this reason, between the ground contact rolling wheels 21, the crawler belt 20 is restricted from being indented and deformed upward. However, in the areas s1 and s2 between the guide ring 24 and the ground contact rolling wheel 21 positioned in front and behind thereof, the exclusive release guide 26 is not provided, so the upper side of the crawler belt 20 in these areas s1 and s2 Indentation deformation is permitted to some extent.
As a result, the center of gravity of the machine body is kept as low as possible by an amount corresponding to the amount of concave deformation on the upper side of the crawler belt 20, and it is easy to ease the impact when the attitude of the machine changes.

  The lower frame component 30 is connected to the lower portion of the front swing arm 4A disposed on the front side in the longitudinal direction of the machine, of the swing arms 4 described later. That is, the support cylinder 34 penetrating the left and right side walls 30b, 30b of the lower frame component 30 is welded and fixed to the left and right side walls 30b, 30b, and the lower support shaft 40 is detachably provided to the support cylinder 34. It is done.

Between the left and right side walls 30b, 30b of the lower frame component 30, between the cylindrical bosses 33 of the ground contact rolling wheels 21 adjacent to each other in the longitudinal direction, and between the cylindrical boss 33 and the support cylinder 34, A reinforcing plate 35 is welded and fixed between the cylindrical boss 33 and the pivot support member 24 b of the induction ring 24.
The reinforcing plate 35 includes the following first reinforcing plate 35a, second reinforcing plate 35b, and third reinforcing plate 35c.
That is, as shown in FIG. 4 and FIG. 6, the lower edge of the side walls 30b, 30b is within the distance in the front-rear direction between the ground contact wheel 21 at the front end position and the second ground contact wheel 21 located immediately thereafter. Then, a corrugated first reinforcing plate 35a bent so as to bypass the position of the support shaft 26a of the detent guide 26 upward is fixed by welding.
Within the space between the second ground contact roller 21 and the support cylinder 34 and in the front-to-rear direction between the support cylinder 34 and the third ground contact roller 21, the side closer to the ground contact roller 21 is a side wall 30 b, 30 b A second reinforcing plate 35b is provided in an oblique position so that the side close to the support cylinder 34 is positioned closer to the upper side away from the lower edge of the side walls 30b, 30b.
A third reinforcing plate bent in an L-shape between the third ground contact rolling wheel 21 and the pivot support member 24b of the guide ring 24, and between the pivot support member 24b and the fourth ground contact rolling ring 21 A 35c is provided.
The first reinforcing plate 35a is also fixed by welding between the cylindrical bosses 33 from the fourth ground contact roller 21 to the last ground contact roller 21.

The upper frame component 31 installed on the upper side of the lower frame component 30 is configured as follows.
That is, the upper frame component 31 is a front frame portion 31A positioned on the front side of a portion corresponding to the notch s3 which is a space for arranging the connecting shaft 43 in the swing arm 4 described later, and the notch and a rear frame portion 31B located on the rear side of s3. Then, a reinforcing member is provided on the upper side of the notch portion s3 in a state where the front frame portion 31A and the rear frame portion 31B located on the rear side of the notch portion s3 span the front frame portion 31A and the rear frame portion 31B. It is linked by 32.

As shown in FIG. 4, a front closing plate 36a is provided on the front side of the notch s3 and extends between the rear end of the front frame portion 31A and the middle part of the reinforcing member 32 and on the rear side of the notch s3. A rear closing plate 36b is provided which extends between the front end of the rear frame portion 31B and the middle of the reinforcing member 32.
In the inside of the rear frame portion 31B, the mud from the side of the induction ring 24 facing the inside of the rear frame portion 31B through the opening 30d on the front side and the rear side of the opening 30d provided on the upper surface 30a side of the lower frame component 30 31 d of shielding boards which suppress scattering of are provided.
Further, an end reinforcing plate 31e is provided at the front end of the front frame portion 31A and the rear end of the rear frame portion 31B.

  The lower portion of the rear swing arm 4B, which is disposed on the rear side in the longitudinal direction of the machine, of the swing arms 4 to be described later is connected to an intermediate position in the front to rear direction of the rear frame portion 31B. That is, the support cylinder 37 penetrating the left and right side walls 31b, 31b of the rear frame portion 31B is welded and fixed to the left and right side walls 31b, 31b, and the lower support shaft 40 on the rear side can be inserted into and removed from the support cylinder 37. Provided in

A recessed portion 31c is formed on the upper surface 31a side of the rear frame portion 31B on the front side of the support cylinder 37 to allow the shaft portion of the upper wheel 27 to enter.
That is, as shown in FIGS. 3 and 6, the end of the swing arm 4 disposed on the rear side on the machine body frame 1 side is connected to the support shaft 19 provided on the machine body frame 1, but On the support shaft 19, an upper roller 27 that contacts the inner circumferential surface on the upper side of the crawler belt 20 is pivotally supported. Therefore, the support shaft 19 connecting the end of the swing arm 4 disposed on the rear side on the side of the machine body frame 1 doubles as the support shaft of the upper roller 27. Then, when the upper surface 31a of the rear frame portion 31B approaches the support shaft 19 portion, the shaft portion of the support shaft 19 and the upper wheel 27 is allowed to enter into the recessed portion 31c. The relative position between the recessed portion 31 c and the support shaft 19 is set.

FIG. 6 shows a state in which the track frame 3 is in the closest position to the machine frame 1, and in this state, the lifting cylinder 28 described later prevents the support shaft 19 and the upper roller 27 from contacting the recess 31c. The upper limit position of the track frame 3 due to is determined.
The recessed portion 31c is provided in a block 38 in which the recessed portion 31c is integrally formed by casting. The block material 38 is loaded from the lower side into the inside of the rear frame portion 31B, and the periphery near the recessed portion 31c is welded and fixed to the opening of the rear frame portion 31B, and plug welding is also performed at the front and back Thus, they are integrally fixed to the rear frame portion 31B.

In the track frame 3, as shown in FIGS. 2, 4 and 5, a pair of left and right bracket side plates 39 is provided around the portion where the notched portion s 3 is formed.
The bracket side plate 39 is provided with an opening 39a at its central portion which allows a certain amount of swinging movement of the connecting shaft 43 in a state where the connecting shaft 43 of the swing arm 4 is inserted. The bracket side plate 39 in the peripheral portion of the opening 39 a covers the left and right side walls 30 b and 30 b of the lower frame component 30, the left and right side walls 31 b and 31 b of the upper frame component 31, and the left and right side wall portions of the reinforcing member 32. Welded and connected fixed. As shown in FIG. 4, the opening area of the opening 39 a in side view is formed to be approximately the same size as the cutout portion s3.

[Swing arm]
As shown in FIG. 2 and FIG. 3, the swing arm 4 is provided at the front and back of the crawler traveling device 2 so as to connect the machine frame 1 and the track frame 3. The rear swing arm 4B (corresponding to the other side swing arm) is provided.

  The front swing arm 4A and the rear swing arm 4B are each provided with an operating arm 46 so as to be integrally rotatable, and the operating arms 46, 46 are connected by a connecting rod 47. A lift cylinder 28 is connected to the operation arm 46 integral with the rear swing arm 4B, of the two operation arms 46, 46. Along with the expansion and contraction operation of the lift cylinder 28, both operation arms 46 and 46 simultaneously pivot in the same direction. That is, the front and rear swing arms 4 are configured to operate in accordance with the extension and contraction operation of the single lifting and lowering cylinder 28.

The lower portion of the front swing arm 4A is connected to the lower support shaft 40 inserted into the support cylinder 34 of the track frame 3 via the first arm 41.
As shown in FIG. 4 and FIG. 5, the first arm 41 is formed in a gate shape straddling the lower frame component 30 in the front-rear direction. That is, the first arm 41 has the cylindrical portion 41a on the upper side, and the lower end side of the arm portion 41b extended downward from the left and right ends of the cylindrical portion 41a protrudes from the support cylinder 34 to the left and right. It is pivotally connected to the left and right ends of the lower support shaft 40.

The cylindrical portion 41a is provided with the central axis extending in the left-right direction, and a connecting shaft 43 whose length in the left-right direction is longer than the width in the left-right direction of the cylindrical portion 41a is inserted therein. The connecting shaft 43 has a transverse axis p1 concentric with the central axis of the cylindrical portion 41a, and is cylindrical in a state of projecting toward the inside of the machine (the center side of the traveling airframe) than the cylindrical portion 41a. It is fixed to the portion 41a.
The track frame side end of the second arm 42 is relatively rotatably connected to the connecting shaft 43 at a portion protruding toward the inner side of the machine than the cylindrical portion 41a. The body frame side end of the second arm 42 is integrally connected and fixed to a support shaft 18 rotatably supported by the body frame 1. An operating arm 46 connected to the connection rod 47 is provided on the support shaft 18 so as to be integrally rotatable, and configured to be capable of swinging operation of the front swing arm 4A accompanying extension and contraction operation of the lifting and lowering cylinder 28 ing.

The connecting shaft 43 of the front swing arm 4A and the cylindrical portion 41a through which the connecting shaft 43 is inserted are provided in a state of being inserted in the left-right direction in the notch portion s3 as shown in FIGS. It is done. Therefore, even if the relative position in the notch s3 of the connecting shaft 43 or the cylindrical portion 41a deviates slightly with the swing operation of the front swing arm 4A, the swing operation of the front swing arm 4A is performed without support. It can be carried out.
That is, the first arm 41 has a function as a cancel link for absorbing a manufacturing error of the front swing arm 4A and the rear swing arm 4B, an error of the attachment position to the track frame 3, and the like.

The rear swing arm 4B is connected via a third arm 45 provided over the lower support shaft 44 inserted into the support cylinder 37 of the track frame 3 and the support shaft 19 rotatably supported by the body frame 1 ing.
The third arm 45 is rotatably supported relative to the lower support shaft 44 and integrally fixed to the support shaft 19. Further, as described above, the operation arm 46 is provided on the support shaft 19 so as to be integrally rotatable, and is configured such that the swing operation of the rear swing arm 4B can be performed along with the extension operation of the lift cylinder 28. .

The support shaft 19 is extended to the upper side of the location where the track frame 3 is present, as shown in FIG. An upper roller 27 is supported on the support shaft 19 via a bearing (not shown).
Then, as shown in FIG. 6, when the rear swing arm 4B is operated in the upward direction to lift the track frame 3 to the highest position, the upper roller 27 is disposed on the upper surface 31a side of the rear frame portion 31B. Therefore, the shaft 19 of the support shaft 19 and the shaft portion of the upper rolling ring 27 supported by the support shaft 19 enter the recess 31 c. Can be moved up as much as possible to approach the airframe 1.

[Tension wheel]
As shown in FIGS. 1, 3 and 7, a tension wheel 5 capable of adjusting the tension of the crawler belt 20 is provided at the rear end of the track frame 3.
The tension wheel 5 is attached to the rear end of the track frame 3 via a tension adjustment mechanism 50. In the tension adjusting mechanism 50, an adjusting rod 53 having an external thread is screwed to a holding portion 51 fixed on the track frame 3 side. This structure is known as adjusting the position of the tension wheel 5 with respect to the track frame 3 back and forth by adjusting the screwing position of the adjustment rod 53 with respect to the holding portion 51 provided with the internal thread side. The mechanism is adopted.
However, the tension adjustment mechanism 50 is configured such that the adjustment rod 53 is attached to the upper surface 31 a side of the upper frame component 31, and the tension wheel 5 is present on the axial center line p 2 of the adjustment rod 53. ing. That is, the acting force in the movement direction of the adjustment rod 53 is configured to linearly act on the tension wheel 5.

[1 of another embodiment]
In the above embodiment, as the bracket side plate 39, an opening 39a which allows a certain amount of swinging movement of the connecting shaft 43 present in the notch portion s3 is provided in the central portion of the bracket side plate 39. Although the thing of the structure surrounding a circumference was illustrated, it is not restricted to this structure.
For example, as shown in FIG. 8, a bracket side plate 39 formed in a bifurcated shape by opening the upper side of the notch s3 may be adopted.
The other configuration may adopt the same configuration as that of the embodiment described above.

[2 of another embodiment]
In the above embodiment, as the reinforcing plate 35 provided in the lower part of the lower frame component 30, between the cylinder bosses 33, between the cylinder boss 33 and the support cylinder 34, and the cylinder boss 33 and the shaft support member 24b. Although the structure which provided the plate-shaped thing separately was shown between each, etc., it is not restricted to this structure.
For example, as shown in FIG. 9, as the reinforcing plate 35, a plate member of an appropriate shape such as a waveform continuous across the entire lower frame component 30 or a wide range may be provided.
The other configuration may adopt the same configuration as that of the embodiment described above.

[3 of another embodiment]
In the above embodiment, the position of the attachment shaft 24a of the induction ring 24 is raised or lowered to some extent by utilizing the semicircular recessed portion 30c provided on the lower half of the left and right side walls 30b, 30b of the lower frame component 30. Although the thing of the structure which was comprised so that position change was possible was illustrated to, it is not restricted to this structure.
For example, the position of the mounting shaft 24 a of the guide ring 24 may be fixed in the vertical position.
Further, the mounting position of the guide ring 24 in the vertical direction is, as shown in FIG. 10, a predetermined distance d1 from the inner peripheral surface of the crawler belt 20 within the range not impairing the guide action of the guide ring 24 against the core metal projection 20a. So as to be spaced apart, it may be higher than the lower edge of the contact roller 21.
As described above, in the case where the position of the guide wheel 24 is raised, it is easy to carry out the overcoming with less impact even when the crawler traveling device 2 gets over the weir. That is, in the regions s1 and s2 between the guide ring 24 and the ground contact rolling wheel 21 located before and behind the guide ring 24, the ease of deformation of the crawler belt 20 due to the absence of the dedicated detachment prevention guide 26, and the predetermined distance The higher position of the guide wheel 24 by d1 makes it possible to further ensure the ease of the bending deformation of the crawler belt 20.
The other configuration may adopt the same configuration as that of the embodiment described above.

[4 of another embodiment]
In the above embodiment, as a frame component constituting the track frame 3, a structure in which two frame components of the lower frame component 30 and the upper frame component 31 are adopted is exemplified. It is not limited.
For example, the frame components may be configured in a plurality of three or more stages.
The other configuration may adopt the same configuration as that of the embodiment described above.

[5 of another embodiment]
Although the above-mentioned embodiment illustrated the thing of the structure using the channel-like member by which the lower side was opened as a frame component, it is not restricted to this structure.
For example, as a frame component, a rectangular pipe-shaped member may be used, or a channel-shaped member and a rectangular pipe-shaped member may be used in combination.
The other configuration may adopt the same configuration as that of the embodiment described above.

[6 of another embodiment]
In the above embodiment, as the swing arm 4, one having a structure configured by a combination of the first arm 41 having the function of the cancel link and the second arm 42 is adopted, and this is used in the front of the track frame 3. Although the thing of the structure arrange | positioned was illustrated, it is not necessarily restricted to this structure.
For example, the swing arm 4 may be disposed at the rear of the track frame 3, which is configured by combining the first arm 41 and the second arm 42.
The other configuration may adopt the same configuration as that of the embodiment described above.

[Seventh Embodiment]
In the above embodiment, as the swing arm 4 connecting the track frame 3 and the machine body frame 1, the fork-shaped first arm 41 straddling the track frame 3 and the first arm 41 project from the first arm 41 Although the connecting shaft 43 and the second arm 42 located on the lateral side of the track frame 3 by being pivotally connected to the projecting portion of the connecting shaft 43 are illustrated, this structure is not necessarily required. It is not limited to
For example, it adopts a known structure in which a bifurcated first arm 41 straddling the track frame 3 and a bifurcated second arm 42 straddling the first arm 41 are connected by a connecting shaft 43. You may
The other configuration may adopt the same configuration as that of the embodiment described above.

[8 of another embodiment]
In the above embodiment, as the ground contact wheel 21 mounted on the track frame 3, the structure in which three places are provided on the front side of the guide ring 24 and five places on the rear side is exemplified. is not.
That is, the arrangement number of the ground contact rolling wheel 21 is not particularly limited, and the arrangement number before and after the guide ring 24 may be the same number, or may be the arrangement number having a large number on the front side. do it. However, it is preferable that the guide ring 24 be near the lower center of gravity of the entire machine in the front-rear direction, and it is preferable to set the number of the grounded rolling wheels 21 in consideration of the weight balance of the front and rear.
Further, the present invention is not limited to the structure in which the ground contact rolling wheels 21 are distributed to both the left and right sides of the track frame 3, and the ground contact rolling wheels 21 are supported in a cantilevered manner with respect to the track frame 3. It may be equipped on one side such as the machine side.
The other configuration may adopt the same configuration as that of the embodiment described above.

  The crawler traveling device according to the present invention can be applied to various working machines such as a self-guided combine, a transport vehicle, or a construction machine or earthworking machine, in addition to the full throw-in type combine shown in the embodiment.

Reference Signs List 1 airframe frame 3 track frame 4 swing arm 5 tension wheel 20 crawler belt 21 ground roller 24 guide wheel 27 upper roller 30 lower frame component 30 e end closing plate 31 upper frame component 31 a upper surface 31 c recessed portion 31 A front frame portion 31B rear frame portion 31d shielding plate 32 reinforcing member 35 reinforcing plate 36a front closing plate 36b rear closing plate 39 bracket side plate 40 lower bearing shaft 41 first arm 42 second arm 43 connecting shaft 53 adjusting rod p1 lateral axis p2 axial core s3 notch

Claims (12)

A track frame mounted with a plurality of ground contact wheels;
The crawler belt includes a crawler belt guided by the ground contact rolling wheel on the ground contact side.
The track frame is configured by stacking a plurality of frame components extending in the front-rear direction in upper and lower stages,
It has a swing arm that connects the track frame to the fuselage frame so that it can be moved up and down.
The swing arm includes a first arm pivotally connected to the lower part of the track frame, and a second arm connected to the upper part of the first arm and the body frame, and the first arm The second arm is relatively rotatably connected via a connecting shaft having a lateral axis along the left-right direction,
The crawler traveling device in which the notch part which the connection axis can enter is formed in the up-and-down direction width of the track frame. A lower portion of the swing arm corresponding to a connection point to the track frame is pivotally connected to a lower frame member positioned at the lowermost stage among the plurality of frame members constituting the track frame,
The crawler traveling device according to claim 1, wherein the notch portion is formed in the frame component positioned above the lower frame component.   In the frame component in which the notch portion is formed, the front frame portion located on the front side of the notch portion and the rear frame portion located on the rear side of the notch portion are the front frame portion and the rear frame 3. The crawler traveling device according to claim 2, wherein the crawler traveling device is connected by a reinforcing member installed on the upper side of the notch portion in a state of being connected to the portion. A bracket side plate fixed to the side portion of the reinforcing member and the side portion of the track frame along the periphery of the notch portion;
4. The crawler traveling device according to claim 3, wherein a lower support shaft connecting the lower side of the first arm to the track frame is supported by the lower frame component via the bracket side plate. The upper portion of the first arm is located above the lower frame component,
The connecting shaft is extended toward the inside of the vehicle in the left-right direction with respect to the lower frame component,
The second arm is located on the inboard side in the lateral direction than the lower frame component, and one end of the second arm is located on the inboard side in the lateral direction than the lower frame component The other end portion of the second arm is pivotally supported by the body frame on the inboard side of the lower frame component in the lateral direction than the lower frame component. Crawler travel device according to any one of the preceding claims. In the frame component in which the notched portion is formed, the front frame portion located on the front side of the notched portion and the rear frame portion located on the rear side of the notched portion have a tubular shape or a groove shape having a downward opening. The notch portion is formed by separating the front frame portion from the rear frame portion.
The crawler traveling device according to any one of claims 2 to 5, further comprising: a front closing plate closing the rear end of the front frame portion; and a rear closing plate closing the front end of the rear frame portion. The swing arm is a swing arm connected to the lower frame component on the front or rear side of the track frame and a frame above the lower frame component on the rear side or front side of the track frame A swing arm on the other side pivotally connected to the component;
Among the swing arms, at the end of the other side swing arm on the machine body frame side, a spindle of an upper rolling ring for guiding the upper inner peripheral side of the crawler belt is mounted, and of the frame components The crawler traveling device according to any one of claims 2 to 6, wherein a recessed portion which allows the shaft portion of the upper wheel to enter is formed on the upper surface side of the upper frame component positioned at the uppermost position.   The crawler traveling device according to claim 7, wherein an end of the other swing arm on the track frame side is pivotally connected to the upper frame component.   A guide ring is provided at an intermediate position in the front-rear direction of the track frame, for guiding the lateral movement of the crawler belt by entering between guide protrusions formed on the crawler belt, and the front side of the guide ring The crawler traveling device according to any one of claims 2 to 8, wherein a plurality of the ground contact wheels are provided on each of the rear side and the rear side. The guide ring is positioned within the lateral width of the track frame in the left-right direction, and a part of the guide ring enters the frame component positioned above the lower frame component. Supported by lower frame components,
Among the frame components positioned above the lower frame component, a shielding plate for suppressing the scattering of mud from the induction wheel side is provided on each of the front portion and the rear portion facing the induction wheel among the frame components. The crawler traveling device according to claim 9, which is A plurality of the ground rolling wheels are pivotally supported by the lower frame component;
At the lower end side of the lower frame component, the lower side of a portion corresponding to between the bearing portions of the ground contact rolling wheels is closed, and the upper side of the position corresponding to the bearing portion of the ground contact rolling wheels A corrugated reinforcing plate is provided to bypass the
The crawler travel device according to any one of claims 2 to 10, wherein each of the front end portion and the rear end portion of the lower frame component is closed by an end closing plate. A tensioning wheel for pressing the crawler belt toward the tension side;
The adjustment rod for adjusting the pressing force of the tension ring is disposed on the upper side of the track frame, and the tension ring is disposed on the axial center line of the adjustment rod. Crawler travel device according to any one of the preceding claims.

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