JP2009078771A - Crawler travelling device of working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crawler travelling device of a working machine with a simple structure capable of travelling and turning while mitigating and suppressing travel vibrations and slip. <P>SOLUTION: The crawler travelling device comprises a plurality of grounding rollers 24, 24a, 24b, 24c, 25, 26 aligned in the longitudinal direction of a truck frame 22. Out of these rollers, the rear-most grounding roller 26 positioned at the rear-most end side and the rear grounding roller 25 positioned on the front side of and adjacent to the rear-most grounding roller are supported by the truck frame to be incapable of lifting up/down. In the plurality of grounding rollers aligned in the longitudinal direction except the rear-most grounding roller 26 and the rear grounding roller 25, the grounding rollers 24, 24a, 24b, 24c are divided into groups so that two adjacent grounding rollers form one group of grounding rollers, and two grounding rollers of each grounding roller group are integrated and connected to the truck frame. In such a state, the device is equipped with balance connection members 40 for connecting the grounding rollers to the truck frame. Each balance connection member is supported by the truck frame to make the two grounding rollers contrarily liftable. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a crawler traveling device for a working machine.

In the crawler traveling device, when the grounded rolling wheels arranged in the front-rear direction of the track frame are moved up and down with respect to the track frame following the unevenness of the ground, it is possible to perform excellent traveling and turning with reduced or suppressed traveling vibration and slip.
As a crawler traveling device for this type of work machine, for example, the one described in Patent Document 1 was first developed.
In the crawler traveling device described in Patent Document 1, all the grounded wheels arranged in the front-rear direction of the track frame are grouped so that two adjacent grounded wheels form one roller group, and each rolling wheel is grouped. Two grounding wheels of the wheel group are supported on the track frame via a balance link.
That is, all the ground wheels can swing up and down with respect to the track frame.

JP 2004-248561 A (paragraph [0025], FIGS. 2 and 4)

In the case of the above-described conventional crawler traveling device, the structure is disadvantageous.
That is, it is necessary to provide a number of support mechanisms for supporting the grounding wheel so that it can swing up and down.
In addition, a stopper mechanism that restricts the rising of the grounding wheel is used to suppress the sinking of the airframe that occurs when the grounding wheel located at the end rises with respect to the track frame when the aircraft stops traveling. Further, it is necessary to provide both the grounding wheel located closest to the track frame front end and the grounding wheel located closest to the track frame rear end.

  An object of the present invention is to provide a crawler travel device for a working machine that can be easily traveled and turned while mitigating or suppressing travel vibration and slip and can be obtained with a simple structure.

The crawler traveling device for a work machine according to the first aspect of the present invention includes a last grounded wheel located closest to the rear end side of the track frame among a plurality of grounded wheels aligned in the front-rear direction of the track frame, and the last grounded wheel. A rear grounding wheel located adjacent to the last grounding wheel on the front side of the track frame is supported on the track frame so as not to be raised and lowered,
Two grounded wheels adjacent to the grounded wheel except the last grounded wheel and the rear grounded wheel of the plurality of grounded wheels aligned in the front-rear direction of the track frame form a single wheel group. A balance connecting member for connecting the grounded wheels to the track frame in a grouped state and in a state where the two grounded wheels of each group of wheels are collectively connected to the track frame,
Each of the balance connecting members is configured to support two grounding wheels on a track frame so that they can be raised and lowered.

  For example, in the combine, the weight of the grain stored in the grain tank is taken into account, and the center of gravity of the fuselage is designed to be located ahead of the center of the truck frame in the front-rear direction. The contact load between the wheel and the last contact wheel becomes relatively small. Then, according to the configuration of the first aspect of the present invention, there is no significant deterioration in the followability with respect to the ground unevenness due to the fact that the back grounding wheel and the last grounding wheel cannot move up and down with respect to the track frame. It is possible to satisfactorily follow the ground unevenness by raising and lowering the grounding wheel except the wheel and the last grounding wheel against the track frame.

  As a result, it is possible to satisfactorily reduce or suppress running vibration and slip following the unevenness of the ground, but the rear grounding wheel and the last grounding wheel have a simple structure that can be supported rotatably. It is possible to obtain a crawler traveling device that has been completed and reduced in cost.

  In the second aspect of the present invention, the center of gravity of the vehicle body is located on the front side of the track frame from the center of the track frame in the front-rear direction in a side view of the vehicle body.

  According to the configuration of the second aspect of the present invention, the ground load between the rear grounding wheel and the last grounding wheel becomes relatively small, and the rear grounding wheel and the last grounding wheel cannot be raised or lowered with respect to the track frame. The follow-up to the ground unevenness due to the occurrence of this phenomenon does not occur and the follow-up to the track frame of the ground contact wheels excluding the rear ground contact wheel and the last ground contact wheel can be made to follow the ground unevenness satisfactorily. it can.

  As a result, it is possible to satisfactorily reduce or suppress running vibration and slip following the unevenness of the ground, but the rear grounding wheel and the last grounding wheel have a simple structure that can be supported rotatably. It is possible to obtain a crawler traveling device that has been completed and reduced in cost.

  In the third aspect of the present invention, the stopper that abuts against the front end portion of the balance connecting member so as to set the rising limit of the grounded wheel that is located closest to the front end of the track frame among the plurality of grounded wheels is set. I have it.

  According to the configuration of the third aspect of the invention, the stopper receives and supports the grounding wheel via the balance connecting member at or near the position where the stopper matches the line of action of the grounding reaction force on the grounding wheel, and the load applied to the stopper is grounded. The load can be equal to or close to the ground reaction force applied to the ring.

  As a result, the stopper mechanism for restricting the rising of the grounding wheel can be obtained as small and compact as possible from the surfaces of the stopper and the member supporting the stopper.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view of a working machine provided with a crawler traveling device 1 according to an embodiment of the present invention. As shown in this figure, this working machine is configured to be self-propelled by a pair of left and right crawler traveling devices 1 and 1 according to the present embodiment, and has a driving unit equipped with a driving seat 2. And a cutting part 10 connected to the front part of the machine body frame 3 of the traveling machine body, and a threshing device 4 and a grain tank 5 provided side by side in the machine body lateral direction on the rear side of the machine body frame 3. Yes.

This machine harvests rice and wheat.
That is, the cutting unit 10 includes a cutting unit frame 11 that is connected to the front portion of the machine body frame 3 so as to be swingable up and down, and the cutting unit frame 11 is swung up and down by the hydraulic cylinder 12. The weeding tool 13 located side by side in the machine body lateral direction at the front end of the mowing unit 10 moves up and down into a descending work state in which the weeding tool 13 is lowered near the ground and an ascending non-working state in which the weeding tool 13 is raised from the ground.

  When the traveling machine body travels with the mowing unit 10 in the descending work state, the mowing part 10 is a part of the plurality of pulling devices 14 in which the planted cereals to be harvested are arranged in the lateral direction of the machine body by the weeding tools 13. Introduced into the pulling device 14 corresponding to the grass tool 13 to cause the pulling processing, the planted cereals that are raised and processed by the pulling device 14 are cut by the clipper-shaped cutting device 15, and the cutting device is cut. 15 is fed by the feeding device 16 to the start end of the threshing feed chain 4a of the threshing device 4.

  The threshing device 4 nips and conveys the stock side of the harvested cereal rice cake in the rear direction of the machine body by the threshing feed chain 4a, and supplies the tip side of the harvested cereal rice cake to the handling room (not shown) to perform the threshing process. The grain tank 5 collects and stores the threshed grains conveyed from the threshing device 4.

  FIG. 2 is a side view of the crawler traveling device 1 on the left side. FIG. 3 is a plan view of the crawler traveling device 1 on the left side. The crawler traveling device 1 on the right side has the same configuration as the crawler traveling device 1 on the left side, and illustration of the crawler traveling device 1 on the right side is omitted. As shown in these drawings, the crawler traveling device 1 includes a track frame 22 connected to the body frame 3 via a pair of front and rear support arms 20, 21, and a transmission case ( And a crawler drive wheel 23 that can be driven and rotated supported by the body frame 3 via a track frame 22 and a track frame 22 arranged side by side in the lateral direction of the track frame 22 that is located laterally outside the traveling body. Of the eight grounding wheels 24, 24a, 24b, 24c, 25, 26 supported by the frame 22, and among the eight grounding wheels 24, 24a, 24b, 24c, 25, 26, A tension ring 27 provided at the rear end portion of the track frame 22 so as to be located at the rear upper part of the grounding wheel 26 positioned closest to the rear end side of the track frame; A crawler driving wheel 23 and the eight grounding wheels 24, 24a, 24b, 24c are provided with a pair of freely movable carrier rollers 28, 28 supported on the machine body frame 3 above the crawler frame 22. , 25, 26, the tension ring 27, and the pair of front and rear carrier rollers 28, 28 are provided with a rubber crawler belt 29.

The front support arm 20 includes a rotation support shaft 20a that rotatably connects the base portion of the support arm 20 to the body frame 3, and a side of the rotation support shaft 20a to which the support arm 20 is connected. It is interlocked with the cylinder rod 31a of the hydraulic cylinder 31 via an interlocking arm 30 that is provided at the opposite end so as to be integrally rotatable.
That is, the front support arm 20 is swung up and down with respect to the body frame 3 around the axis of the rotation support shaft 20a by the hydraulic cylinder 31, and the front end side of the track frame 22 is moved with respect to the body frame 3. Move up and down.

The support arm 21 on the rear side includes a rotation support shaft 21a that rotatably connects a base portion of the support arm 21 to the body frame 3, and a side to which the support arm 21 of the rotation support shaft 21a is connected. Is interlocked with the cylinder rod 33a of the hydraulic cylinder 33 through an interlocking arm 32 provided at the opposite end so as to be rotatable together. The free end side of the rear support arm 21 is connected to the rear end side of the track frame 22 via a cancel link 34.
That is, the rear support arm 21 is swung up and down with respect to the machine body frame 3 around the axis of the rotation support shaft 21 a by the hydraulic cylinder 33, and the rear end of the track frame 22 through the cancel link 34. The side is moved up and down with respect to the body frame 3.

In other words, when the pair of front and rear support arms 20 and 21 in the left and right crawler traveling devices 1 and 1 are operated to swing, the traveling machine body is inclined laterally or longitudinally with respect to the ground.
That is, the pair of front and rear support arms 20 and 21 in one of the left and right crawler traveling devices 1 are both raised or lowered, and the lift and lower strokes of the pair of front and rear support arms 20 and 21 are the same. The track frame 22 in one of the left and right crawler traveling devices 1 is raised or lowered in parallel to the body frame 3, and one end in the lateral direction of the traveling body is crawler traveling on the other end side. The grounding point by the apparatus 1 is moved up and down with respect to the ground using the swinging fulcrum.

  Ascending or descending stroke of the support arms 20 and 21 in the left and right crawler traveling devices 1 so that one of the front support arm 20 and the rear support arm 21 in the left and right crawler traveling devices 1 swings up or down. Or the track frame 22 in the left and right crawler traveling devices 1 swings up and down with respect to the body frame 3 with the ground contact point on the front end side as a swing fulcrum. Alternatively, it swings up and down with respect to the body frame 3 with the grounding point on the rear end side as a swing fulcrum, and one end in the front-rear direction of the traveling body moves up and down with respect to the ground with the other end as a swing fulcrum. .

  As shown in FIGS. 5 (a) and 5 (b), the airframe frame 3 includes a stopper 35 that is disposed and fixed to the frame material constituting the airframe frame 3 near the cancel link 34.

  FIG. 5A shows the horizontal state of the body frame 3. FIG. 5B shows a state in which the body frame 3 is inclined upward. As shown in these drawings, when the front end side of the track frame 22 is lowered by the downward swinging operation of the support arm 20 and the body frame 3 is inclined to the forward upward state, the contact of the cancel link 34 is abutted. The portion comes into contact with the stopper 35. Then, the stopper 35 locks the swing of the cancel link 34 with respect to the track frame 22, thereby stopping the swing of the track frame 22 with respect to the body frame 3. That is, the rear end side of the track frame 22 is lifted and swung with respect to the body frame 3 to prevent the crawler belt 29 from coming into contact with the body frame 3.

  Next, of the eight grounding wheels 24, 24a, 24b, 24c, 25, and 26, the grounding wheel 26 that is located closest to the rear end side of the track frame is referred to as a last grounding wheel 26, and Of the grounding wheels 24, 24 a, 24 b, 24 c, 25, 26, the grounding wheel 25 located adjacent to the last grounding wheel 26 in front of the last grounding wheel 26 is referred to as a rear grounding wheel 25. I will explain.

  As shown in FIGS. 4 and 6, the rear grounding wheel 25 and the last grounding wheel 26 are supported by the track frame 22 so as to be free to rotate, and cannot move up and down with respect to the track frame 22. Yes.

  As shown in FIGS. 2, 4, and 8, the grounding wheel except the last grounding wheel 26 and the rear grounding wheel 25 among the eight grounding wheels 24, 24 a, 24 b, 24 c, 25, 26 is excluded. The wheels 24, 24a, 24b, 24c are grouped so that two adjacent grounded wheels 24, 24 form one wheel group, and the two grounded wheels 24, 24 of each wheel group are arranged. It is supported by the track frame 22 in a state where it is collectively connected to the tract frame 22 by one balance connecting member 40.

  Each of the balance connecting members 40 described above is rotatably supported by the track frame 22 via a connecting shaft 41 located at an intermediate portion thereof. One grounding wheel 24 of the two grounding wheels 24, 24 forming each wheel group is freely rotatable to a portion located on the front end side of the connecting shaft 41 of the balance connecting member 40. The other grounding wheel 24 is supported on a portion of the balance connecting member 40 located on the rear end side of the connecting shaft 41 so as to be freely rotatable.

  Thus, among the eight grounding wheels 24, 24a, 24b, 24c, 25, 26, the grounding wheels 24 excluding the last grounding wheel 26 and the rear grounding wheel 25, each of the rolling wheels. Two grounding wheels 24 and 24 forming a wheel group are attached to the track frame 22 by a balance connecting member 40, and the axis of the connecting shaft 41 is swung by the swing of the balance connecting member 40. It moves up and down against the track frame 22 as a moving fulcrum.

  FIG. 2 shows the position of the center of gravity G of the traveling machine body with respect to the claw traveling device 1 in a state where the grain tank 5 is empty and the traveling machine body is in a horizontal posture in the front-rear direction. As shown in the figure, the center of gravity G of the vehicle body is located on the front side of the track frame with respect to the center C in the front-rear direction of the track frame 22 in the side view of the traveling vehicle body and is third from the front side of the traveling vehicle body. The balance connecting member 40 supporting the grounding wheel 24a and the fourth grounding wheel 24b is positioned on a vertical line passing through the swing axis 40a.

  As a result, the left and right crawler traveling devices 1 reduce the ground load between the rear grounding wheel 25 and the last grounding wheel 26 as compared with that of the other grounding wheels 24, 24a, 24b, 24c, and the rear grounding wheel. There is no significant deterioration in the trackability of the crawler belt 29 with respect to the ground unevenness caused by the fact that the wheel 25 and the last grounding wheel 26 cannot be raised and lowered with respect to the track frame 22, and the rear grounding wheel 25 and the last grounding wheel 26. The traveling machine body is caused to travel while causing the crawler belt 29 to follow the unevenness of the ground by the back and forth of the grounding wheels 24, 24a, 24b, 24c excluding the wheel 26 against the track frame 22.

  The crawler traveling device 1 includes a crawler guide 42 provided corresponding to each of the above-described roller group, and a crawler guide 43 provided corresponding to the rear grounding wheel 25 and the last grounding wheel 26. .

  As shown in FIGS. 2 and 3, the crawler guides 42 corresponding to the respective wheel groups are arranged between a pair of left and right guide wheel bodies of one ground wheel 24 of the wheel group and the other ground wheel. A rod-shaped guide body 42a positioned between a pair of left and right guide wheel bodies 24, and a connecting rod 42b for connecting the guide body 42a to the balance connecting member 25. The claw belt 29 is prevented from coming off by engaging the left and right core metal projections 29a, 29a of the crawler belt 29 with the main body 42a. The crawler guide 42 corresponding to each wheel group is produced by integrally casting the guide body 42a and the connecting rod 42b together with the balance connecting member 40.

  The crawler guide 43 corresponding to the last grounding roller 26 and the rear grounding wheel 25 is a pair of left and right guide wheels of the last grounding wheel 26 and a pair of left and right guide wheels of the last grounding wheel 26. A rod-shaped guide body 43a located between the body parts and a connecting rod 43b for connecting the guide body 43a to a guide mounting part 44 provided in the track frame 22 are provided. The claw belt 29 is prevented from coming off by engaging with the left and right metal core protrusions 29a of the crawler belt 29. The crawler guide 43 is manufactured by integrally casting the guide main body 43a and the connecting rod 43b.

  As shown in FIG. 7, the guide mounting portion 44 of the track frame 22 is configured by attaching a metal block to the lateral side surface of the track frame 22. The guide attachment portion 44 has three connection bolts 45 arranged on the end of the guide attachment portion 44 in a triangular arrangement in the vertical direction and the front-rear direction of the track frame 22, thereby connecting the crawler guide 43. 43b is supported.

  As shown in FIG. 2, the crawler traveling device 1 includes a stopper mechanism 50 having a stopper 51 disposed near the front end of the track frame 22, and is the most of the eight grounding wheels 24, 25, 26. The stopper mechanism 50 restricts the rising of the grounding wheel 24c located on the front end side of the track frame with respect to the track frame 22.

  FIG. 8 is a plan view of the stopper mechanism 50. FIG. 9 is a side view of the stopper mechanism 50. As shown in these drawings, the stopper mechanism 50 includes a stopper 51 and a support member 52 extending from the front end of the track frame 22 so as to support the stopper 51.

  The support member 52 is integrally formed with the support portion 53 by integral casting with a member constituting the support portion 53 for the balance connecting member 40 on the track frame 22.

  The stopper 51 is constituted by a traveling machine body vertical screw shaft mounted in a mounting hole of the support member 53.

  FIG. 9 shows the operating state of the stopper 51. As shown in this figure, the stopper 51 has a balance between the tip 51a of the stopper 51 as the grounding wheel 24c rises with respect to the track frame 22 around the axis of the connecting shaft 41 of the balance connecting member 40. The front end portion of the connecting member 40 is brought into contact with a portion located immediately above the support shaft 54 of the grounding wheel 24c. That is, the stopper 51 receives and supports the grounded wheel 24c via the balance connecting member 40 at a position matching the action line L of the grounding reaction force in the grounded wheel 24c, and sets the rising limit of the grounded wheel 24c.

  FIG. 10 is a sectional view of the carrier roller 28. As shown in the figure, the carrier roller 28 includes a cylindrical shaft 62 that is externally fitted to a support shaft 60 via a pair of bearings 61, 61, and a ring body that is provided rotatably at both ends of the cylindrical shaft 62. 63.

  The carrier roller 28 includes a grease chamber 64 formed by the cylindrical shaft 62 around the support shaft 60 and a collar 68 fitted in the end of the cylindrical shaft 62. The collar 68 and the cylindrical shaft 62 are sealed with an O-ring 65. The grease chamber 64 supplies and stores the grease from the grease nipple 66 attached to the center portion of the collar 68 through an oil supply passage 67 positioned at the end of the support shaft 60 and supplies the grease to the bearing 61. .

Side view of work equipment Side view of crawler traveling device Top view of crawler traveling device Side view of the rear part of the crawler traveling device (A) is a side view of the airframe in a horizontal state, and (b) is a side view of the airframe in a state where the airframe is raised upward. Plan view of the arrangement of the rear grounding wheel and the last grounding wheel Side view of crawler guide attachment Top view of the stopper mechanism Side view of stopper mechanism Cross section of carrier roller

Explanation of symbols

22 Track frame 24, 24a, 24b, 24c Grounding wheel 25 Rear grounding wheel 26 Last grounding wheel 40 Balance connecting member 51 Stopper G Center of gravity C Center of track frame

Claims (3)

Of the plurality of grounded wheels arranged in the longitudinal direction of the track frame, the last grounded wheel located closest to the rear end of the track frame and adjacent to the last grounded wheel on the front side of the track frame from the last grounded wheel The rear grounding wheel located is supported on the track frame so as not to be raised and lowered,
Two grounded wheels adjacent to the grounded wheel except the last grounded wheel and the rear grounded wheel of the plurality of grounded wheels aligned in the front-rear direction of the track frame form a single wheel group. A balance connecting member for connecting the grounded wheels to the track frame in a grouped state and in a state where the two grounded wheels of each group of wheels are collectively connected to the track frame,
A crawler traveling device for a working machine, wherein each of the balance connecting members is configured to support two grounding wheels on a track frame so as to be movable upside down.   The crawler traveling device for a working machine according to claim 1 or 2, wherein a body center of gravity of the traveling body is located on a front side of the track frame with respect to a center in the front-rear direction of the track frame in a side view of the traveling body.   2. A stopper that abuts against a front end portion of the balance connecting member so as to set a rising limit of a grounded wheel that is positioned closest to the front end of the track frame among the plurality of grounded wheels. Or the crawler traveling apparatus of the working machine of 2.

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