JP2019081487A - Track roller movable support mechanism of crawler traveling apparatus - Google Patents

Abstract

To provide a track roller movable support mechanism of a crawler traveling apparatus capable of reducing a maintenance cost by giving priority to replacement of an inexpensive washer and elongating the replacement timing of a rocking track roller.SOLUTION: A lower side shaft bearing part 21a included in a rocking arm 21 that is supported by a track frame 11 of a crawler traveling apparatus 1 so that the rocking arm can freely vertically move is provided with a washer receiving part 25 with a track roller shaft bearing length L held from the shaft end. The washer receiving part 25 restricts an inward movement of an inside washer 26 engaged with the lower side shaft bearing part 21a. The track roller shaft bearing length L is made slightly larger than a layer width of a track roller boss 15a, the inside washer 26, and an outside washer 27 which are engaged with the lower side shaft bearing part 21a. An accompanying rotation deriving from abutment on the track roller boss 15a is permitted. Further, at least the inside washer 26 is made of a synthetic resin.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a roller movable support mechanism of a crawler traveling device which can be installed in a work vehicle such as a combine.

Conventionally, the crawler traveling device installed in the combine is vertically movable (rocking) in the rolling contact direction to the track frame at an intermediate position between the lower rolling wheels before and after rolling and guiding the inner circumferential surface of the ground contact side portion of the crawler. A movable wheel movable support mechanism in which a movable rolling wheel (a rocking rolling wheel) is provided on a lower side pivotal support portion of a rocking arm which is freely supported and is brought into rolling contact is already known. (For example, Patent Document 1)
Further, in the crawler traveling device installed in the harvester, a rocking arm supported so as to be spring-biased and supported so as to be able to rock in the rolling contact direction is provided on the track frame. A rolling wheel movable support mechanism has already been known in which a rolling wheel is inserted and supported by an outer washer provided on the shaft end side. (For example, Patent Document 2)

JP, 2005-254919, A Japanese Utility Model Application Publication No. 4-86593

In the crawler traveling device of the combine shown in the above-mentioned patent document 1, since it is necessary to remove and disassemble the rocking arm when it is necessary to replace the rocking wheel and washer, etc., complicated and time-consuming and expensive maintenance There is a drawback to work.
The crawler travel device of the harvester shown in Patent Document 2 supports a rocking roller made of synthetic resin in a cantilevered manner on the lower side shaft support portion of the rocking arm, as well as supporting it by means of an outer washer on the shaft end. Therefore, it has a lightweight and simple structure, and has an advantage that the wheel replacement work can be facilitated by removing the bolt at the shaft end.
However, in this type of rolling wheel movable support mechanism, metal washers are generally used as washers for preventing slippage of the rolling wheel, so that it is easy to cause premature wear of the rolling wheel boss portion. There is a drawback that the cost of maintenance work such as replacement of a high priced synthetic resin rocking wheel is high.

In order to solve the above problems, according to the present invention, first, a swing arm 21 is supported by a track frame 11 of the crawler travel device 1 in a rolling contact direction and supported so as to be vertically movable. In the rolling wheel movable support mechanism of the crawler traveling device, the rocking rolling ring 15 made of synthetic resin is inserted into the lower side shaft support portion 21a of the second embodiment by the outer washer 27 provided on the shaft end side.
An inner washer is provided on the lower side support 21a of the swing arm 21 with a wheel support length L from the shaft end to provide a washer receiving part 25 and the washer receiving part 25 is inserted into the lower side support 21a. 26 while restricting the movement of the inner side of the wheel 26 and slightly larger than the overlapping width of the wheel boss portion 15a inserted into the lower shaft support portion 21a, the inner washer 26 and the outer washer 27 It is characterized in that it is allowed to rotate together with contact with the ring boss portion 15a, and at least the inner washer 26 is formed of a synthetic resin.
Secondly, the inner washer 26 is characterized in that it is made of a synthetic resin softer than the synthetic resin that forms the rocking roller 15.
Third, the outer washer 27 formed of the same synthetic resin as the inner washer 26 is allowed to rotate in contact with the rolling boss portion 15a at the lower side pivot support portion 21a of the swing arm 21. It is characterized in that it can be inserted.

According to the first aspect of the present invention, the track frame of the crawler traveling device is provided with the swing arm which is urged in the rolling contact direction and supported so as to be vertically movable, and is fitted into the lower side support portion of the swing arm. In a rolling wheel movable support mechanism of a crawler traveling device in which a rotating roller made of synthetic resin is supported by an outer washer provided on the shaft end side in a retaining shaft, an outer washer at the shaft end side on the lower side pivotally supporting portion of the rocking arm And a washer receiving portion provided with a rolling bearing support length, which restricts the inward movement of the inner washer inserted into the lower bearing section by the washer receiving section, and the rolling bearing support length is used as the lower bearing support section. Slightly wider than the overlapping width of the wheel bosses, the inner washers, and the outer washers inserted into the housing to allow the co-rotation by contact with the wheel bosses, and at least the inner washers formed of synthetic resin By,
The inner washer made of synthetic resin positioned by the washer receiver has a shock absorbing action on the synthetic resin contact surface and is allowed to rotate together with the contact of the rotating wheel boss and is in sliding contact with it. Since it is possible to suppress the wear of the part and extend the replacement time of the rocking and rolling wheel, and to give priority to the replacement of the inner washer manufactured simply and inexpensively, it is possible to reduce the maintenance operation cost.
According to the invention as set forth in claim 2, by forming the inner washer by a synthetic resin softer than the synthetic resin forming the rocking roller, at least the inner washer is soft and has a sliding property. Since the rotational bosses are positioned and regulated without shock resistance and noise due to shock absorption, wear of the wheel bosses is suppressed, enabling long-term use of high-priced rocking wheels. As the inner washer positioned by the washer receiver is allowed to slide along with the contact of the rolling wheel boss and is allowed to come in sliding contact, wear is also suppressed and its own replacement time can be extended to reduce the replacement frequency There is a feature that can be done.
According to the invention as set forth in claim 3, an outer washer formed of the same synthetic resin as the inner washer is brought into contact with the rolling wheel boss portion in the lower side pivotal support portion of the swing arm. By inserting it acceptably,
The outer washer formed of the same synthetic resin as the inner washer is allowed to rotate together with the wheel boss, but with the inner washer, the wear on both sides of the wheel boss is slightly even. Since the degree of wear of the inner and outer washers can be made equal, maintenance operations such as washer replacement can be performed at the same time while extending, and the outer washer and the inner washer The maintenance work cost can be reduced, for example, by combining parts.

It is a right side view of a combine provided with a crawler traveling device to which the present invention is applied. It is a top view which shows the state which removed the cabin from the combine of FIG. It is a left side view showing the structure of a crawler traveling device. It is a rear view which shows the rolling wheel movable support mechanism of the crawler traveling device of FIG. It is a rear view which shows the principal part of the rolling-wheel movable support mechanism of FIG. It is sectional drawing which shows the floating shaft support structure of a rolling wheel movable support mechanism. The structure of a roof apparatus is shown, (a) is a right view, (b) is a perspective view which shows the structure of a roof part. It is a perspective view which shows the lever guide structure of a control lever.

  An embodiment of the present invention will be described based on the drawings. The combine A as a working vehicle shown in FIGS. 1 and 2 has a pretreatment unit supported in front of the machine body frame 2 provided with the crawler traveling device 1 according to the present invention forming a pair on the left and right via an elevator mechanism. A threshing unit 4 for threshing the grain scraped by the pre-processing unit 3 is disposed on the rear left side thereof and a discharge processing unit 4a for discharge cutting are disposed on the rear left side thereof, and the right side of the machine frame 2 is operated from the front The operation unit 5, the engine unit 6 installed on the lower rear side of the operation operation unit 5, and the grain tank 7 for storing threshing grains and discharging the stored grains from the grain discharge auger 7a are disposed. There is.

In the illustrated example, the combine travel A is transmitted to the crawler travel device 1 from the engine E of the engine unit 6 via a transmission structure including a belt transmission mechanism 6a, a transmission 6b, etc., so as to be capable of shifting. The belt transmission mechanism 6a is designed to efficiently cool a predetermined portion of the transmission structure by providing a belt driven predetermined pulley with a blower structure.
Moreover, although the driving operation part 5 is entirely covered by the cabin 8, in the thing which removed this cabin 8, the roof apparatus 8a which is mentioned later by FIG. 7 can be provided.
Further, on the side operation panel 5a side of the drive operation unit 5, a lever guide structure of the operation lever 9 as shown in FIG. 8 can be installed.

Next, the specific configuration of the crawler traveling device 1 will be described in detail with reference to FIGS.
The crawler traveling device 1 includes a drive sprocket 10 integrally assembled to a leading end of a traveling drive shaft 6c extending from the transmission 6b to the left and right, and a track frame 11 formed on the left and right lower sides of the body frame 2. The driven wheels 12 as idlers, and the plurality of lower rolling wheels 13, the rolling rolling wheels 15, the upper rolling wheels 16, etc. And an endless belt-like crawler 17 disposed on the left and right of the machine body.

  Since the crawler travel device 1 of the illustrated example is for combine use, it is a rubber type crawler 17 manufactured with a plurality of core metals embedded in a rubber band, and a pair is formed on the inner peripheral surface of the contact width center of the crawler 17 By making the projecting centering bar projections 17a, 17a into a rolling contact ring structure in which each rolling wheel disposed at a predetermined position guides and regulates, smooth traveling with the crawler 17 prevented from rolling is enabled. ing.

In the above-described rolling contact ring structure, the lower rolling wheel 13 and the upper rolling wheel 16 are supported in a cantilevered manner by a rotating wheel shaft 18 inserted and supported from the outer side to each shaft support portion of the track frame 11, The mandrels 17a and 17a are positioned in the valleys formed by the drum shape in a ring shape, and are in rolling contact to guide movement.
The upper roller 16 is cantilevered on the upper side of the track frame 11 at a position above the rocking roller 15, and is in rolling contact with the non-grounded inner circumferential surface of the crawler 17 to restrict and support sagging due to its own weight.

  On the other hand, as shown in FIG. 4 to FIG. 6, the rocking rolling wheel (movable ring) 15 is supported in a cantilevered manner via a rocking arm 21 pivotally supported by the track frame 11. By means of the mechanism 20, the valley portion between the left and right mandrel projections 17a, 17a at the center position in the front-rear direction of the contact length of the crawler 17 is formed into a single wheel body which is in rolling contact. The swing arm 21 in the illustrated example is formed by bending a single round bar into a crank shape in a rear view, thereby forming the lower side support 21a and the upper side shaft formed on the lower and upper portions of the straight arm. It has a simple structure in which the support 21b and the support 21b are parallel, but it is not limited to this and has a conventional structure in which the upper side shaft support 21b and the lower side shaft support 21a are provided on the upper and lower sides of a straight arm made of plate members. May be

  The rolling wheel movable support mechanism 20 includes a swinging rolling wheel 15 formed of a synthetic resin such as ABS, for example, supported by a lower swinging support portion 21a of the swinging arm 21 by a swinging shaft support structure described later. A pressing spring 22 engaged downward from the track frame 11 by engaging the middle part of the track 21 and protruding from the track frame 11 so as to be in contact with the swing arm 21 restricts the lower limit position of the swing roller 15 Lower limit stopper 23 and the like.

  As a result, the swinging arm 21 has a structure in which the swinging rolling wheel 15 is assembled in advance to the lower side shaft support 21a in a unit shape via the floating shaft support structure, and the upper side shaft support 21b is formed on the track frame 11 After being inserted into the support portion 11a, the shaft end is detachably held by a stopper 24 such as a bolt. Then, the pressing spring 22 is assembled so as to bias the swing arm 21 downward via the shaft support portion 11a.

  The rolling wheel movable support mechanism 20 according to the above configuration can freely swing the swinging rolling wheel 15 upward against the biasing force via the swinging arm 21, and the swinging arm 21 and the lower limit stopper 23 And the lower limit position of the rocking roller 15 can be held through the contact with the above. In addition, the rolling wheel movable support mechanism 20 can be configured so as to be easily disassembled for maintenance work, and can be manufactured at low cost.

  And, at the front and rear intermediate position of the roller contact length, when the crawler 17 is moved over the ridge and the large convex portion on the ground, the rocking roller 15 disposed swingably between the front and rear lower roller 13 groups travels. In addition, since it retreats and moves upward against the biasing force of the pressing spring 22, it is possible to travel smoothly over unevenness without large tilting and shocking vibration on the machine body.

In addition, the swing rolling ring 15 which receives the vibration load on the front, rear, upper and lower sides and the left and right of the crawler 17 constantly changing with traveling and the composite direction performs lateral vibration rotation which rotates while slightly moving in a lateral direction. The support structure makes it possible to easily carry out the maintenance operation without losing the slidability and durability.
That is, the rocking roller 15 having the floating shaft support structure of the embodiment has the roller boss portion 15a integral with the synthetic resin ring body projecting outward with a length about twice the width of the wheel body. An axial hole having a small amount of joint play with the lower side shaft support 21a is formed and supported at the center of the ring body.

On the other hand, as shown in FIG. 6, the swinging arm 21 has a rolling bearing supporting length L inwardly from the shaft end of the lower side bearing 21a and has a washer receiving portion 25 projecting therefrom. The support length L is slightly longer than the total thickness (overlapping width) of the synthetic resin inner washer 26 to be inserted, the wheel boss portion 15a and the outer washer 27 combined. Further, a screw hole 12c is formed at the center of the axial end of the lower side shaft support 21a, and the bolt 29 having the press washer 28 is inserted into the screw hole 12c to insert the inner washer 26 and the wheel hub boss. This makes it easy to assemble the part 15a and the outer washer 27 and the like.
Further, the inner washer 26 and the outer washer 27 are softer than the rocking roller 15 made of ABS and can be slidable. For example, the lower washer 21 is made of synthetic resin such as nylon 6 or the like. It is desirable to make it possible to play freely.

  In assembling the idler shaft support structure according to the above configuration, the inner washer 26 is first inserted into the lower shaft support portion 21a of the swing arm 21, and then the outer washer 27 is engaged with the swing roller 15 inserted. Thereafter, the bolt 29 with the press washer 28 inserted and set is inserted into the screw hole 21c and fastened. That is, according to this floating shaft support structure, the small clearance which enables the axial small movement (lateral movement) of the rocking rolling wheel 15 between the inner washer 26 and the outer washer 27 by the rolling wheel shaft supporting length L. Can be easily and quickly assembled.

The inner washer 26 and the outer washer 27 made of soft synthetic resin move laterally while having the function of alleviating the contact impact when the rolling boss portion 15a abuts with the lateral movement of the rocking rolling wheel 15. In addition to restricting contact wear loss of the rolling wheel boss portion 15a, at this time, the inner washer 26 and the outer washer 27 are caused to rotate together while being in sliding contact with the rolling wheel boss portion 15a with contact. Since this can be done, the wear of the inner washer 26 and the outer washer 27 itself as well as the side surface of the wheel boss portion 15a can be suppressed.
The outer washer 27 may be fastened and fixed at the shaft end of the presser washer 28 and the lower side shaft support 21a. In this case, the inner washer 26 can be rotated together.

  The rolling wheel movable support mechanism 20 in the crawler traveling device 1 configured as described above supports the rocking rolling wheel 15 on the lower side shaft support portion 21a of the rocking arm 21. And the washer receiver 25 is provided to restrict the inward movement of the inner washer 26 inserted into the lower shaft support 21a, and the above-mentioned roller shaft support length L is used as the lower shaft. The width is slightly larger than the overlapping width of the inner washer 26, the wheel boss portion 15a, and the outer washer 27 which are inserted into the support portion 21a. As a result, the rocking roller 15 rotates while repeatedly contacting one side without contacting the wheel boss portion 15a with the inner washer 26 and the outer washer 27 simultaneously by the small left and right gaps, and guides the crawler 17 in a rolling contact manner. Can.

Since the inner and outer washers 26 and 27 on the side where they are in contact with each other do not cause rolling resistance or rolling noise due to the buffer action of the soft, sliding synthetic resin bonding interface, the positioning of the wheel boss portion 15a is restricted. The abrasion loss on the wheel boss portion 15a side is suppressed, and the long-term use of the expensive swing wheel 15 is enabled.
On the other hand, the inner washer 26 and the outer washer 27 positioned by each of the washer receiving portion 25 and the presser washer 28 are allowed to rotate together with the contact of the rolling wheel boss portion 15a and are in sliding contact with each other. There is an advantage that the time of replacement can be extended and the frequency of replacement can be reduced.

In the rolling wheel movable support mechanism 20 of the embodiment, when the inner washer 26 and the outer washer 27 need to be replaced, the outer washer 27 can be removed from the lower shaft support 21 a simply by loosening and removing the bolt 29. The rocking roller 15 can be pulled out, and the inserted inner washer 26 can be easily pulled out.
And, it is possible to quickly and efficiently carry out the replacement of the new inner washer 26, the swing rolling wheel 15, and the outer washer 27 by reverse work.

Therefore, priority is given to the replacement of the synthetic resin inner washer 26 or the outer washer 27 etc., which has a simple shape and is inexpensively manufactured, and the maintenance cost is reduced while the replacement of the high-cost oscillating rolling wheel 15 is minimized. While being able to do, it can produce the effect of making it easy to do a long-term combine operation etc.
Then, the outer washer 27 formed of the same synthetic resin as the inner washer 26 is inserted into the lower side pivot support 21a so as to allow the co-rotation by contact with the rolling wheel boss 15a. Since the loose shaft support structure can suppress uneven wear on both sides of the wheel boss portion 15a while equalizing the degree of wear of the inner washer 26 and the outer washer 27 at the same time, it is time to perform maintenance work such as washer replacement. It can be extended. Further, the inner washer 26 and the outer washer 27 can be mass-produced inexpensively by combining washer parts, and can be replaced simultaneously at the same time.

Next, each unit configured in the combine A of the embodiment will be described with reference to FIGS. 1, 2, 7 and 8. First, this combine A is as shown in FIG. 7 after removing the cabin 8 from the operation control unit 5 shown in FIG. 1 or in advance the roof device 8a instead of the cabin 8 at a position shown by a two-dot chain line in FIG. And the upper part of the driving operation unit 5 can be covered.
The roof device 8a of the illustrated example has a roof support 30 erected from the vehicle body frame 2 at the rear of the driver's seat 5b, a square roof 31 covering the driver seat 5b, the side operation panel 5a, etc. A folding support mechanism 32 and the like are switchable between a use posture shown by and a folding posture to be folded back to be retreated shown by a two-dot chain line.

  The roof portion 31 is provided with a contact avoidance structure for avoiding contact between the two at the overlapping position with the grain discharging auger 7a in the storage posture shown in the drawing when switching from the use posture to the folding posture. There is. This contact avoidance structure forms a cutaway portion 33 obtained by cutting out a contact position which is a corner portion on the right rear of the roof portion 31, and a corner portion cover (notch cover) having a shape covering the cutaway portion 33. A mounting member 34 such as a bolt is detachably provided in the mounting hole 31a on the roof portion 31 side.

  As a result, the roof device 8a in a state in which the corner cover (notched cover) 34 is removed or rotationally retracted can be brought into the folded posture without bringing the roof 31 into contact with the grain discharging auger 7a. Incidentally, the contact avoidance structure is not limited to that shown in the example shown, but, for example, by providing a lateral movement mechanism between the roof portion 31 and the roof support 30 side, the roof portion via the lateral movement mechanism 31 may be provided from the side of the roof support 30 toward the exterior of the vehicle so as to be retractable and movably returnable.

  Next, with reference to FIG. 8, an operation structure of the operation lever 9 installed in the driving operation unit 5 will be described. This lever operation structure can be installed, for example, on the side operation panel 5a, etc. The switching position holding at least three positions in the front and rear direction of the operation lever 9 in the front and back direction is maintained by a simple and inexpensive configuration. To be able to do it. When the operated object to be operated in this way is, for example, a narrow guide 36 installed on the side of the pre-processing unit 3, three positions of the maximum overhang position F, the center overhang position N, and the storage position R It becomes possible to perform operation easily and promptly.

That is, the lever operation structure of the illustrated example has the same configuration as a conventional one, and rotates the operation lever 9 inserted in the guide groove 37 formed in a long hole shape in the front and rear direction in the side operation panel 5a in the front and rear direction. The lower end side is connected to a predetermined position of the narrow guide 36 via a connecting member 38 such as an operation wire in a state where the movable operation is installed.
The control lever 9 is provided with a hook-like stopper member 40 switchable between a stopper posture shown by a solid line centering on the fulcrum shaft 39 of the vertical axis and a non-stopper posture on the flat surface of the side operation panel 5a. The stopper piece 40a formed at the front end of the guide groove is switchably faced to the middle position of the guide groove 37.

  Thereby, when the operation lever 9 is at the rear position R of the solid line, the forward movement is restricted by the stopper piece 40a of the stopper member 40, and the narrow guide 36 can be positioned and held at the storage position R. When in the front position F indicated by a two-dot chain line, the backward movement is restricted by the stopper piece 40a of the stopper member 40, and the narrow guide 36 is positioned and held at the maximum overhanging position F.

  In the lever operating structure of the embodiment, in the above configuration, the stopper pin 40b as the interlocking member is projected toward the inside of the movement trajectory of the operation lever 9 at the portion where the tip of the stopper piece 40a is bent upward. In addition, a pin hole 41 is formed as a locking portion for detachably locking the stopper pin 40b. Thus, in the lever operating structure, the operator operates the operating lever 9 from each operating position to the middle position N indicated by the two-dot chain line, where the stopper member 40 is rotated in the direction of the arrow to move the stopper pin 40b to the pin hole 41 The narrow guide 36 can be moved to the overhung position N via the link member 38 and positioned and held.

A Combine 1 Crawler travel device 11 Track frame 15 Swing rolling wheel 15a Rolling wheel boss portion 20 Rolling wheel movable support mechanism 21 Swing arm 21a Lower side support portion 25 Washer receiving portion 26 Inner washer 27 Outer washer L Rolling wheel shaft support length

Claims (3)

A swing arm (21) is supported by the track frame (11) of the crawler travel device (1) in a rolling contact direction to be supported so as to be vertically movable, and a lower side shaft support portion of the swing arm (21) In the rolling wheel movable support mechanism of the crawler traveling device, the rocking rolling ring (15) made of synthetic resin and inserted into 21a) is supported by the outer washer (27) provided on the shaft end side for retaining shaft prevention,
The lower side shaft support (21a) of the swing arm (21) is provided with a washer receiving portion (25) from the shaft end with a roller shaft supporting length (L), and the lower portion is provided with the washer receiving portion (25) In addition to restricting the inward movement of the inner washer (26) inserted into the side shaft support (21a), a rolling wheel boss (the above-mentioned rolling wheel shaft support length (L) is inserted into the lower side shaft support (21a) 15a), slightly larger than the overlapping width of the inner washer (26) and the outer washer (27) to allow co-rotation by contact with the wheel boss (15a), and at least the inner washer (26) Is made of a synthetic resin.   The roller movable support mechanism of the crawler traveling device according to claim 1, wherein the inner washer (26) is formed of a synthetic resin softer than a synthetic resin forming the rocking roller (15).   An outer washer (27) formed of the same synthetic resin as the inner washer (26) is brought into contact with the wheel boss (15a) on the lower side pivot support (21a) of the swing arm (21) The roller movable support mechanism of the crawler traveling device according to claim 1 or 2, wherein the rotational rotation is allowed to be inserted.

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