JP2004114847A - Crawler type work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crawler type work vehicle capable of securing travel stability of a machine body, and improving comfortableness in turning by improving grounding performance of grounding wheels in getting over ridges. <P>SOLUTION: A plurality of grounding wheels 9 to guide the grounding side of a crawler belt 12 are separated into a plurality of groups each comprising a plurality of the grounding wheels 9 adjacent to each other in a forward-backward direction. The grounding wheels 9 in each group are rotatably supported by a wheel bracket 19. The wheel bracket 19 right after a drive wheel 10 in the forward-backward direction of the machine body to be adjacent to it is supported on a balance frame 50 to be respectively supported around an axial center in a lateral direction of the machine body in such a way that a balance can oscillate. The balance frame 50 is supported on a truck frame 7 around the axial center lateral to the machine body in such a way that the balance can oscillate. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a crawler traveling type work in which a pair of left and right crawler traveling devices is provided on a traveling machine body, and the crawler traveling device is configured to hang a crawler belt over a driving wheel and an idler wheel disposed behind the traveling wheel. About the car.
[0002]
[Prior art]
The conventional crawler traveling type work vehicle divides the grounding wheels adjacent to each other in the longitudinal direction of the fuselage into three pairs, and divides each of the three grounding wheel groups into a first movable frame. The balance swing arm is rotatably supported at both ends, and three balance swing arms are each swingably supported on a track frame (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-96871 (paragraph numbers [0018] to [0019], FIGS. 2 and 6)
[0004]
[Problems to be solved by the invention]
Since the above configuration is adopted, when the uneven surface is relatively small, the ground followability can be secured by the balance swing of the pair of ground wheels, but the balance swing arm is supported. The track frame does not swing up and down relatively to the traveling body. Therefore, in the case of the conventional configuration, in the case of going up and down the ridge sequentially from the grounding wheel located in front and going down, each grounding wheel simply swings on the balance with respect to the attitude of the track frame, and None of the four ground contact wheels adjacent to the vehicle did not follow the ground on the long inclined surface (see FIG. 9B). For this reason, the movement of the center of gravity when moving over the ridge becomes large, and the traveling stability of the traveling aircraft is lacking.
Such a problem also has an influence on the fact that the rise of the wheel with respect to the track frame is small.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a crawler traveling type work vehicle that secures traveling stability of a traveling machine body by enhancing the contact performance of a contact wheel at the time of a ridge. And
[0006]
[Means for Solving the Problems]
〔Constitution〕
The invention is characterized in that a plurality of grounding rollers for guiding the crawler belt on the grounding side are divided into a plurality of sets of a plurality of grounding wheels which are adjacent to each other in the longitudinal direction of the fuselage. The wheels are rotatably supported on the first movable frame, and the first movable frames adjacent to the drive wheels in the vehicle longitudinal direction immediately after the drive wheels in the vehicle longitudinal direction are respectively attached to the second movable frame by the body lateral axis. The second movable frame is supported on the track frame so as to be freely swingable around a horizontal axis of the machine body.
[0007]
[Action]
Four ground contact wheels located immediately behind the drive wheels are attached to the first movable frame one by one in the same manner as in the related art, so that the pair of ground contact wheels are freely swingable, and a pair of ground contact wheels is attached. One movable frame is disposed in front and rear positions, and these first movable frames are supported so as to be swingable around a fulcrum axis provided on the track frame.
Accordingly, for example, as shown in FIG. 9B, even when the second movable frame 50 is on the relatively long inclined surface after passing through the top of the ridge, the second movable frame 50 is kept on the inclined surface regardless of the posture of the track frame. The four grounding rollers 9 that swing on the basis of the posture of the second movable frame 50 are aligned in a straight line along the inclined surface. The state can be ensured, and the traveling body can run stably.
On the other hand, as shown in FIG. 9A, when traveling on a fine uneven surface, the first movable frames 19 before and after are changed to different inclination postures regardless of the posture of the second movable frame 50, and each inclination is changed. Since the posture is along the plane, the same grounding posture as in the related art can be maintained, and the function of the related art is not impaired.
[0008]
〔effect〕
A pair of first movable frames that swing on a balance supporting the grounding wheels are attached to the second movable frame, and the second movable frames are attached to the track frame so that the balance can swing, so that they are adjacent to each other in the longitudinal direction of the machine. Increase the relative vertical movement of the ground wheels so that each ground wheel can smoothly follow the unevenness of the running surface, while maintaining the stability of the running machine even when over ridges, reduce the vertical movement As a result, the vehicle can be driven stably with good riding comfort.
[0009]
〔Constitution〕
In the characteristic configuration of the invention according to claim 1, the first movable frame, which is located immediately in front of the ground rolling wheel for guiding the crawler belt in the longitudinal direction of the machine, is directly supported on the track frame so as to swing freely. Point.
[0010]
[Action]
In addition to the functions and effects of the invention according to claim 1, the following functions and effects are provided. That is, for example, if a plurality of rear ground contact wheels are configured using two types of movable frames similarly to the four ground contact wheels located immediately behind the drive wheels, the vertical movement of the ground contact wheels becomes large. On the contrary, there is a disadvantage that the center of gravity of the traveling body is largely moved and becomes unstable. Therefore, the first movable frame to which the two grounding wheels are attached is directly attached to the track frame, and a stepping force is secured at this portion so that the pitching operation is not increased.
[0011]
〔effect〕
In this way, the stability of the traveling machine body is ensured even when over ridges by properly using the support form of the grounding roller corresponding to the front and rear positions of the crawler traveling device, the support form with a large swing amount and the small support form. I can do it.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[Overall configuration]
FIG. 1 shows a combine as an example of a crawler traveling type work vehicle (an example of an agricultural work vehicle). 1, a boarding-type operation unit 2, a threshing device 3 for threshing the cut culm from the reaping unit 1, a grain tank 4 for storing the grains threshed by the threshing device 3, and below the driver's seat 5. A traveling body A having an engine E is provided. The traveling body A and a pair of left and right crawler traveling apparatuses B are connected via a lifting drive mechanism C, and the traveling body A is connected to the crawler traveling apparatus B. It can be driven up and down freely.
[0013]
[Crawler traveling device]
As shown in FIGS. 2 and 3, each of the crawler traveling devices B includes a track frame 7 that is connected to a body frame 6 via a lifting drive mechanism C so as to be able to drive up and down, and a rear end of the track frame 7 in the body longitudinal direction. Tension rolling wheels 8 supported by the section, six ground rolling wheels 9 for guiding the crawler belt 12 on the ground side, driving wheels 10 supported on the body front side of the body frame 6, and these driving wheels 10 A rubber crawler belt 12 is wound around the ground wheel 9 and the tension free wheel 8.
[0014]
As shown in FIGS. 2, 5 and 6, the track frame 7 includes a square pipe-shaped main frame portion 14 and a square pipe-shaped auxiliary frame portion 15 fixed to the lower surface side of the main frame portion 14. A rectangular pipe-shaped extension frame portion 16 fitted in the rear end side of the main frame portion 14 in an inscribed state and mounted so as to be able to move back and forth in the longitudinal direction of the fuselage. The tension free wheel 8 is supported by the portion.
[0015]
The tension idler wheels 8 are supported by bearings on the extension frame portion 16 and are connected to the rear end of the main frame portion 14 by a position adjusting mechanism 17 using a screw mechanism, so that the front and rear of the body of the track frame 7 can be adjusted. It is provided so that the position can be adjusted in the direction and the position can be fixed.
The driving wheels 10 are provided so that power is transmitted from a transmission case fixed to the body frame 6 and is engaged with the crawler belt 12 to transmit driving force.
[0016]
As shown in FIG. 4 to FIG. 6, the grounding wheel 9 has rotating wheels 21 fixed to both ends of a rotating shaft 20 so that each rotating wheel 21 It is provided so as to be in contact with the inner peripheral surface of the crawler belt 12 at both side positions, and is divided into three sets including a combination of two ground contact rollers 9 adjacent in the longitudinal direction of the machine (running direction). The first two sets of support structures and the second set of support structures have different structures, and the following structure is employed.
[0017]
As shown in FIGS. 4 and 9, the former two sets are provided with a balance frame (an example of a second movable frame) 50 that can swing around a support shaft 49 fixed to the auxiliary frame portion 15, A cast wheel bracket (an example of a first movable frame) 19 that is swingable around the fulcrum shaft 18 is provided at the front and rear end positions of the balance frame 50 in the front and rear posture, and the front and rear ends of the respective wheel brackets 19 and 19 are provided. The grounding rollers 9 are rotatably supported at the respective positions so that the respective wheel brackets 19 can swing freely around the fulcrum shaft 18 and swing around the support shaft 49 of the balance frame 50 independently. The four ground wheels 9 are configured to swing by movement.
[0018]
As shown in FIGS. 7 and 9, the other pair is provided with a cast wheel bracket 19 that is swingable around a fulcrum shaft 18 fixed to the auxiliary frame portion 15 and is provided with two grounding rollers. The wheel 9 is rotatably supported on each of the wheel brackets 19, and is supported so as to be swingable around a fulcrum shaft 18.
[0019]
As shown in FIG. 4, the wheel bracket 19 includes a boss 23 for a fulcrum that is rotatably fitted to the fulcrum shaft 18 and two bearings that rotatably support the rotating shaft 20 of the ground wheel 9. Boss 24 and a sled guide 25 for preventing derailing having a T-shaped cross section are integrally formed, and each ground is formed on a straight line passing through the fulcrum axis X of the fulcrum shaft 18 in a side view. In the state where the rotation axis Y of the rolling wheel 9 is located, the fulcrum boss portion 23 and the two bearing boss portions 24 are provided so that each ground rolling wheel 9 is supported at a symmetrical position with the fulcrum shaft 18 interposed therebetween. And an arm 30 for connecting them.
[0020]
In other words, by positioning the fulcrum axis X at the center of a line connecting the rotation axes Y of the front and rear ground wheels 9, the relative vertical movement of each ground wheel 9 is increased, and each ground wheel 9 is rotated. The vehicle can smoothly follow the unevenness of the running surface, and reduce the vertical movement of the running machine A so that the vehicle can travel stably with good riding comfort.
Further, by integrally casting the sled guide 25 with the rolling bracket 19, the rolling bracket 19 is reinforced and the mounting structure of the sled guide 25 can be simplified.
[0021]
As shown in FIGS. 5 and 6, the sled-shaped guide 25 is located between the left and right metal core projections 22 of the crawler belt 12 to limit the movement of the crawler belt 12 in the left-right direction, so that the sled-shaped guide 25 comes off. The lower surface of the intermediate portion of the sled-shaped guide 25, which is located between the front and rear contact wheels 9 in a side view, is raised so as to be higher than the lower surface of the front and rear portions. The crawler belt 12 is allowed to penetrate into the machine side due to running on the uneven surface.
[0022]
(Elevation drive mechanism)
As shown in FIGS. 2 to 5, the lifting drive mechanism C connects the body frame 6 and each of the track frames 7 with a pair of front and rear swing links 13 separately, and connects each swing link 13 with a fluid pressure. Each of the hydraulic cylinders 33 as a cylinder is driven to swing by the expansion and contraction operation of the hydraulic cylinder 33 so that the traveling machine body A is driven up and down with respect to the crawler traveling device B.
[0023]
The pair of front and rear swing links 13 includes a front swing link 34 provided on the front side of the fuselage and a rear swing link 35 provided on the rear side of the fuselage. A movable front hydraulic cylinder 36 and a rear hydraulic cylinder 37 for driving and oscillating the rear oscillating link 35 are provided on the body frame 6 so that the oscillating links 34 and 35 can be individually driven and oscillated. I have.
[0024]
As shown in FIG. 2, the front swing link 34 is provided with a bell crank-shaped link member 38 that is pivotally supported on the fuselage frame 6 near the bending point so as to be swingable about a horizontal axis. A first extending arm portion 39 extending in one direction from the pivotal support point is connected to the front hydraulic cylinder 36, and a second extending arm portion 40 extending in the other direction is fixed to an upper portion of the track frame 7. It is pivotally connected to the support shaft 41 so as to be swingable.
[0025]
As shown in FIGS. 2 and 7, the rear swing link 35 has a bell crank-shaped first arm 42 that is pivotally supported by the body frame 6 near its bending point so as to be swingable about a horizontal axis. And a second arm 43 pivotally connected to the track frame 7 so as to be swingable, and a first extending arm portion 44 extending in one direction from a pivoted position of the first arm 42. Is connected to the rear hydraulic cylinder 37, and a second extending arm portion 45 extending in the other direction is pivotally connected to the second arm 43 via a rear support shaft 46 so as to be swingable.
[0026]
As shown in FIG. 7, the second arm 43 is pivotally connected to a support shaft 47 integrally formed with a fulcrum shaft 18 supporting the wheel bracket 19 on the rear side of the fuselage on the track frame 7. It is formed in a curved shape in a side view so as not to interfere with the ground contact wheel 6 at the time of swinging.
[0027]
As shown in FIG. 7, the second arm 43 constituting the rear swing link 35 drives and swings the swing links 34 and 35 individually, as described above, to move the traveling body A to the crawler traveling device. B is provided so that it can be driven up and down with respect to B. However, there are manufacturing errors, assembling errors, and / or assembly errors of the hydraulic cylinders 36 and 37 and the oscillating links 34 and 35 that constitute the elevating drive mechanism C. Since some errors in dimensional accuracy, such as occurrence of backlash due to long-term use, can be absorbed, it is effective in smoothly operating the elevation drive mechanism C.
[0028]
A fixed type guide body 51 provided between the ground contact wheel 9 and the idle wheel 8 located at the highest position will be described. As shown in FIGS. 7 and 8, the guide body 51 is composed of a plate-shaped main body 51A attached to the track frame 7 and a flange body 51B formed at the lower end of the plate-shaped main body 51A. A flange body 51B is attached to the rear of the boss 24 so as to be located between the mandrel projections 22 behind the sled guide 25. The distal end portion 51a of the plate-shaped main body 51A extends to above the bearing boss portion 24, and is arranged at a position where it comes into contact with the bearing boss portion 24 from above.
[0029]
As shown in FIG. 7, the lower end position of the tension idler wheel 8 is located slightly above the contact position of the contact wheel 9 to improve the turning performance. However, due to this configuration, when the grain tank 4 is full or when the binding machine is mounted, the combine performs the pitching operation when the balance is in the post-balance state. On the other hand, it is necessary to prevent the grounding wheel 9 from coming off. Therefore, by adopting the above-described configuration, the flange body 51B prevents the grounding wheel 9 from coming off and restricts the pitching operation of the grounding wheel 9 by the tip end 51a of the plate-shaped main body 51A. As described above, the dual use of the guide body 51, which is a single component, to achieve two functions was achieved.
[0030]
[Other embodiments]
1. In the above embodiment, the two front and rear ground wheels 9 are supported so as to swing freely. However, three or more wheels may be supported as a pair so as to freely swing.
2. In the above-described embodiment, a configuration is adopted in which two grounding rollers 9 located immediately behind the driving wheels 10 are supported so as to be able to swing freely and the four grounding wheels 9 as a whole are allowed to swing freely. However, a configuration may be adopted in which the four grounding rollers 9 located in front of the tension free wheel 8 are both oscillated on a balance basis and the four grounding rollers 9 as a whole are slidably supported on the balance. .
3. The crawler traveling type work vehicle according to the present invention is not limited to an agricultural work vehicle such as a combine, but may be, for example, a work vehicle for civil engineering or construction.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a crawler traveling type working vehicle. FIG. 2 is a side view of a main part explaining the crawler traveling type working vehicle. FIG. 3 is a main part plan view of the crawler traveling device. FIG. FIG. 5 is a cross-sectional view of a main part of a crawler traveling device. FIG. 6 is a cross-sectional view of a main part of a crawler traveling device. FIG. 7 is a side view showing a mounting structure of a guide body. [Figure 9] Side view showing ground contact state of ground contact wheel [Description of reference numerals]
Reference Signs List A traveling machine body B crawler traveling device Y rotating shaft core 7 track frame 8 tension idler wheel 9 grounding wheel 10 drive wheel 12 crawler belt 19 first movable frame 50 second movable frame

Claims (2)

A crawler traveling type work vehicle comprising: a pair of left and right crawler traveling devices provided on a traveling machine body, wherein the crawler traveling device is configured by extending a crawler belt over driving wheels and idler wheels disposed behind the driving wheels. ,
The plurality of grounding rollers that guide the grounding side of the crawler belt are divided into a plurality of sets of a plurality of grounding wheels that are adjacent in the longitudinal direction of the fuselage, and each set of grounding wheels is rotatably supported by the first movable frame. At the same time, the first movable frames adjacent to each other in the vehicle longitudinal direction immediately behind the drive wheels in the vehicle longitudinal direction are respectively supported on the second movable frames so as to be freely swingable around the body horizontal axis. A crawler traveling type work vehicle in which a second movable frame is supported on a truck frame so as to swing freely around a horizontal axis of the machine. The crawler traveling type work according to claim 1, wherein a first movable frame located immediately before the idler wheel for guiding the crawler belt in the longitudinal direction of the machine is directly supported on a track frame so as to be freely swingable. car.

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