JP2004231013A - Rolling wheel supporting structure of crawler traveling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lower part rolling wheel mechanism which vertically oscillates front and rear wheels like a balance by making a pivotally supporting shaft as a fulcrum, and a lower part rolling wheel structure of a crawler traveling device which easily regulates vertical oscillation of the rolling wheel. <P>SOLUTION: In this crawler traveling device, the front and rear rolling wheels 22 are journaled on a rolling wheel supporting piece 29 oscillatably provided on a traveling frame 17 by making the pivotal shaft 26 as the fulcrum, and a grounding side inner peripheral surface of a crawler 15 wound on a drive wheel 16 and a driven wheel 19 is guided by the rolling wheels 22. By forming a regulating surface 33 substantially parallel to a lower surface of the traveling frame 17 on the rolling wheel supporting piece 29 when the rolling wheel supporting piece 29 becomes a horizontal state and mounting a planar regulating plate 36 in a gap H between the regulating surface 33 and a lower surface of the traveling frame 17, further upward oscillation of the side mounted with the regulating plate 56 is eliminated from the substantially horizontal state of the rolling wheel supporting piece 29, and oscillation to an upper side of the rolling wheel 22 is regulated. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wheel supporting structure of a crawler traveling device installed in a work vehicle such as a tractor or a combine.
[0002]
[Prior art]
2. Description of the Related Art Generally, a crawler traveling device of a working vehicle that guides an inner peripheral surface on a ground side of a crawler stretched over a driving wheel and a driven wheel by a plurality of lower rolling wheels (track rollers) supported on a traveling frame (track frame) is known. A front crawler contact angle that is inclined forward and upward by the foremost wheel and drive wheel, and a rear crawler contact angle that is inclined backward by the rearmost wheel and driven wheel, and The distance between the wheel and the last wheel is the ground contact length. Then, a pair of adjacent front and rear rolling wheels are pivotally supported on a rolling wheel support piece provided swingably on a pivot shaft of the traveling frame at a fulcrum, and the ground contact side of the crawler is guided by following the unevenness of the ground. In addition, the vehicle travels while preventing pitching or the like in which the body largely tilts up and down.
[0003]
Also, a work vehicle provided with a crane on the front side of the traveling body equipped with the crawler traveling device as described above, and raising and supporting the front side of the body by an outrigger, a rotation stopper is protruded on the lower surface of the traveling frame, The rotation stopper is brought into contact with the upper side of the wheel supporting piece to restrict upward swinging of the rearmost wheel, and damage to the driven wheel due to the driven wheel being grounded when the body is supported by the outrigger, etc. There is known a crawler-type work vehicle that prevents the occurrence of a vehicle (for example, see Patent Document 1).
[0004]
[Patent Document 1]
Utility Model Registration No. 2571728 (Page 3, FIG. 1, FIG. 3)
[0005]
[Problems to be solved by the invention]
As described above, the former crawler traveling device, in which the front and rear wheels are swingably supported by the wheel supporting pieces, has a structure in which the front and rear centers of gravity of the body are located near the approximate center of the contact length, and the traveling wheels are supported. By oscillating the front and rear wheels supported by one piece, it is possible to perform good traveling while preventing pitching of the body, but in this case, for example, a work machine such as a front dozer which is a heavy object is mounted on the front side of the body. When the tillage device is mounted on the rear side or the tillage device is mounted on the rear side, and the center of gravity is in an unbalanced state that is largely biased toward the work machine mounting side, the position where the lower surface of the traveling frame contacts the wheel support piece on the work machine mounting side It sinks down to the inclined position.
Then, when the vehicle starts to move to the work machine mounting side in this aircraft inclination posture, the aircraft will head up due to the traveling reaction force at the time of starting, try to incline in the opposite direction to the previous inclination posture, and then the traveling reaction force will be resolved Then, there is a disadvantage that the aircraft travels while repeating pitching due to these recoils in an attempt to return to the previous inclined posture.
[0006]
Therefore, in order to prevent the above-mentioned pitching traveling, the rotation as shown in Patent Document 1 of the latter makes the rotation stopper protruding from the lower part of the traveling frame abut against the slope of the rolling-wheel supporting piece to swing the rolling-wheel. When the regulation is performed, the inclination of the machine body toward the work machine mounting side can be regulated, and the inclination of the machine body can be suppressed based on the securing of a sufficient contact length to prevent repetition of pitching.
However, in this configuration, the protruding rotary stopper protruding from the traveling frame is configured to contact the upper slope (upper side) of the rolling wheel supporting piece, so that the rotating stopper and the rolling wheel supporting piece are localized. There are drawbacks in that the contact portion is repeatedly worn due to repeated contact, and the contact portion receives a concentrated load and is easily worn out early, and traveling vibration is directly transmitted to the body via the rotation stopper, making it difficult to travel at high speed.
[0007]
Furthermore, since the rotation stopper as described above is provided on the traveling frame from the beginning when the work vehicle is manufactured in the factory, when the work machine is to be detached from the body and the operation mainly involving the traveling body (including plowing work) is to be performed. However, if the user tries to remove the rotation stopper in order to freely swing the wheel at the site, there is a problem that it is difficult to remove the rotation stopper fixed in advance on the traveling frame side.
[0008]
For this reason, as shown in FIGS. 9 and 10, a rotation stopper 36 formed by an eccentric shaft is rotatably supported on the upper part of the left and right wheel supporting pieces 29, and is screwed into a screw portion 37 at the end of the eccentric shaft. By tightening the nut 39, a rolling wheel support structure that supports the rotation stopper so as to be switchable between a stopper state protruding from the upper side and a non-stopper state immersed in the upper side was tried. In this case, the rotation stopper 36 was used. Although there is an advantage that the switching between the two positions can be easily performed, there is a problem that the traveling frame and the rotation stopper 36 come into contact with each other by line contact and the contact portion is easily worn out, similarly to the above.
[0009]
Therefore, in order to prevent the lower surface of the traveling frame and the wheel supporting piece from coming into contact with each other by surface contact and to prevent the contact portion from being worn, an inclination of the upper side of the wheel supporting piece and the lower surface of the traveling frame are substantially triangular. It is also conceivable that the rotation stopper is formed in a wedge shape so as to be able to fill the gap, and this wedge-shaped rotation stopper is provided on the wheel supporting piece and is brought into contact with the lower surface of the traveling frame. However, in this case, a complicated processing technique of forming the rotation stopper into a wedge shape and a trouble of accurately attaching and fixing the wedge-shaped rotation stopper to the inclined surface of the rolling wheel support piece are required, and particularly, the user is required. There is a problem that the work of attaching the rotation stopper to the crawler traveling device performed on site becomes complicated and the cost increases.
Therefore, according to the present invention, when the rolling wheel supporting piece is in a horizontal state, a substantially parallel regulating surface is formed on the lower surface of the traveling frame, so that the A flat rotation stopper (restriction plate) can be easily mounted between the surface and the lower surface of the traveling frame, and can be easily controlled by a crawler traveling device that does not restrict the rotation of the rolling wheels. It is an object of the present invention to provide a wheel supporting structure of a crawler traveling device that can be changed to a different shape.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned conventional problems, the roller supporting structure of the crawler traveling device according to the present invention comprises a traveling frame 17 in which a traveling wheel 17 is pivotally mounted on a pivot shaft 26 as a fulcrum. In the crawler traveling device that supports the wheels 22 and 22 and guides the inner peripheral surface on the ground side of the crawler 15 wound around the drive wheel 16 and the driven wheel 19 by the wheels 22 and 22, When the wheel supporting piece 29 is in a horizontal state, a regulating surface 33 is formed substantially parallel to the lower surface of the traveling frame 17, and a flat plate-shaped gap H is formed between the regulating surface 33 and the lower surface of the traveling frame 17. By mounting the regulating plate 36, further upward swinging of the side on which the regulating plate 36 is mounted from the substantially horizontal state of the rolling wheel support piece 29 is disabled, and the upward swinging of the rolling wheel 22 can be regulated. It is characterized by having been constituted.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. Reference numeral A shown in FIGS. 1 and 2 indicates a tractor as a working vehicle provided with a crawler type traveling device (crawler traveling device) 1 according to the present invention on the left and right sides of a traveling vehicle body 2. The engine 4 is mounted in the front bonnet 3 by the same arrangement and configuration as the conventional one, and the maneuvering section 6 covered by the cabin 5 is arranged at the rear of the engine 4. A front work machine mounting portion 8 for mounting the work machine 7 so as to be movable up and down, and a rear work machine mounting portion 9 for mounting a work machine (not shown) such as a tilling device so as to be vertically movable.
[0012]
As shown in FIGS. 11 and 12, the control unit 6 is provided with an armrest mechanism 13 having a wrist platform 12 on a seat 11 disposed behind the handle 10 so as to be switchable between a use posture and a storage posture. I have. Further, engine cooling exhaust air is blown from an air supply port 14 formed in the bonnet 3 to a window surface 5a below the front side of the cabin 5 that covers the control unit 6, and dust and the like rolled up by the crawler traveling device 1 on the window surface 5a. We try to prevent adhesion.
[0013]
Next, the traveling device 1 will be described with reference to FIGS. First, as shown in FIG. 3, the traveling device 1 supports a rubber crawler 15 formed in an endless belt shape on a driving wheel 16 driven by the power of the engine 4 and a traveling frame 17 so as to be movable in the front-rear direction. The inner peripheral surface of the crawler 15 is supported by a plurality of lower rollers 20 mounted on the traveling frame 17, and the upper side of the inner peripheral surface of the crawler 15 is supported by upper rollers 21. It is configured to guide and support.
[0014]
The crawler 15 forms a ground contact portion between the foremost rolling wheel 22 and the rearmost rolling wheel 22, and forms a front crawler ground contact angle F by the driving wheel 16 and the foremost rolling wheel 22 in front of the ground contact portion. The rear crawler ground contact angle R is formed by the driven wheel 19 and the rearmost wheel 22 on the rear side of the contact part.
In addition, the lower wheel 22 and the upper wheel 21 straddle the inner peripheral surface of the crawler 15 so as to straddle both outer sides of the core metal projection 23 protruding in a forked shape at the center of the inner peripheral surface of the crawler 15. It is a double flange type ring that guides in contact.
[0015]
Next, a support structure of the lower roller 20 will be described with reference to FIGS. The lower rolling wheel 20 includes a pivot shaft 26 pivotally supported by left and right mounting brackets 25 attached to the front and rear of the traveling frame 17, a pivot cylinder 27 rotatably inserted into the pivot shaft 26, Roller support pieces 29 each formed of a plate-like member integrally fixed to the left and right sides of the cylinder 27 at the center of the upper side, wheel support brackets 30 attached to the front and rear of the left and right wheel support pieces 29, and each wheel. A wheel shaft 31 is rotatably inserted into and supported by the support bracket 30, and left and right wheels 22 mounted and supported on both ends of the wheel shaft 31.
With this configuration, the rollers 22 provided as a pair of front and rear wheels on the wheel supporting pieces 29 swing about the pivot shaft 26 via the wheel supporting pieces 29 according to the uneven shape of the ground on which the crawler 15 touches the ground. Make a dynamic rotation.
[0016]
Further, the wheel supporting piece 29 forms a horizontal regulating surface 33 on the upper and lower sides around the pivot 26 when viewed from the side (FIG. 6), and a gap H is formed between the wheel supporting piece 29 and the lower surface of the traveling frame 17. In addition, a contact portion 35 that forms a downward inclined surface at an angle θ from the end of the flat surface of the regulating surface 33 is formed, and has a symmetrical shape about the pivot 26.
With this configuration, the lower rolling wheel 20 can swing and rotate within a range in which the front and rear contact portions 35 formed on the rolling wheel support piece 29 contact the lower surface of the traveling frame 17, respectively. Since the entire surface of the contact portion 35 formed by the inclined surface contacts the horizontal lower surface of the traveling frame 17 in a surface contact state, the swing range of the wheel supporting piece 29 can be reliably restricted.
[0017]
In addition, since the lower wheel 20 forms a parallel gap H between the regulating surface 33 and the traveling frame 17 at the swinging neutral position, a flat regulating member having a certain thickness and width in the gap H is formed. When the plate 36 is inserted and fixed to the regulating surface 33 (FIG. 7), the upper swing of the rolling wheel 22 on the side where the gap H is filled with the regulating plate 36 makes the regulating plate 36 contact the lower surface of the traveling frame 17. It can be regulated in a wide contact state.
At this time, as shown in FIG. 6, the regulating plate 36 straddles a strip-shaped flat iron plate having a thickness of about the gap H or less on the regulating surfaces 33, 33 of the left and right wheel supporting pieces 29, 29. In a state where the regulating plate 36 is placed on the left and right regulating surfaces 33, 33, the joint portion between the two is attached and fixed by simple fixing means such as welding.
The restricting plate 36 is not limited to the fixing means described above, but may be detachably provided on the lower surface of the traveling frame 17 with mounting bolts, or may be fixedly mounted by welding.
[0018]
When the crawler traveling device 1 configured as described above travels in a state where the regulating plate 36 is not provided on the regulating surface 33 of the lower rolling wheel 20, the front and rear rolling wheels are supported on the pivot shaft 26 via the rolling wheel support pieces 29. 22 can swing up and down like a balance, and swing regulation at this time is performed by the contact portion 35 contacting the traveling frame 17.
That is, when the unevenness of the ground or the convex portion such as the earth mass or the stone reaches the location of the rolling wheel 22 of the crawler 15, the rolling wheel 22 is moved via the crawler 15 by the resistance of the convex portion to the pivot shaft 26 of the rolling wheel support piece 29. By swinging upward around the center and bending the crawler 15 upward, it is possible to smoothly ride over the convex portion, and to perform smooth running in which the body is prevented from rolling right and left and pitching from tilting back and forth. Can be.
[0019]
In addition, when the vehicle runs over a large step portion when performing track stacking using a ridge or a road board, the rear rolling wheel 22 of the driving wheel 16 and the front rolling wheel 22 of the driven wheel 19 follow the step portion. The vehicle can be smoothly moved over a levee or in a truck in a state in which the body is tilted upward and backward to prevent the crawler from coming off, and that the body is prevented from largely tilting back and forth in a seesaw shape.
[0020]
On the other hand, as shown in FIGS. 6 to 8, when the regulating plate 36 is provided on the regulating surface 33 of the wheel supporting piece 29, a gap H formed between the traveling frame 17 and the regulating surface 33 by the regulating plate 36 is formed. For example, when the rolling wheel 22 immediately behind the driving wheel 16 rides on the convex portion, the regulating plate 36 immediately contacts the lower surface of the traveling frame 17 and swings the rolling wheel 22 upward. It is regulated and the swinging rotation downward is free. In this example, a regulating plate 36 is provided on the regulating surface 33 of the rolling wheel support piece 29 so as to regulate upward swinging of the frontmost and rearmost wheels 22.
Therefore, when performing high-speed traveling with the work implement 7 such as a front dozer mounted on the front side of the traveling machine body 2, the front wheel 22 does not swing upward due to the weight of the work implement 7, so that the front crawler contact angle. The contact length can be sufficiently ensured while maintaining F. As a result, the body does not lean forward and lean significantly due to the weight of the front work machine 7, thereby suppressing the head-up at the time of starting the body, and the phenomenon of repeating pitching due to this, and giving an uncomfortable swing to the operator during traveling. Absent.
[0021]
At this time, the regulating surface 33 can be configured as a regulating plate 36 using a flat iron plate, and the regulating plate 36 is brought into surface contact with the lower surface of the traveling frame 17 to prevent the concentrated rolling load 20 from being reduced. Can be easily configured.
Further, in this case, the structure of the lower rolling element that restricts the swing and the one that does not restrict the swing can be easily changed by the presence or absence of the regulating plate 36.
Further, the regulating plate 36 is made slightly thinner than the gap H, so that a small gap h is formed between the regulating plate 36 and the traveling frame 17 as shown in FIG. Since a small swing of the wheel supporting piece 29 in the same direction can be tolerated, the vibration transmitted from the crawler 15 when traveling on a flat road is not directly transmitted to the traveling frame 17 but is allowed in the small gap h. It is possible to perform traveling with reduced vibration and reduced vibration due to the minute swing of the rolling wheel 22.
[0022]
Next, the armrest mechanism 13 provided on the seat 11 of the control section 6 will be described with reference to FIGS. The armrest mechanism 13 includes an armrest 51 provided on the left side surface of the back support 50, and an auxiliary armrest which is mounted and supported at the tip of the armrest 51 via a joint 52 so as to be switchable between a use posture and a storage posture. 53, and the wrist table 12 and the like, which are pivotally supported at the distal end of the auxiliary armrest 52 by a vertical mounting shaft 55.
[0023]
Then, when the armrest mechanism 13 is set to the use posture extended to the front side indicated by the solid line in the figure, the operator sitting on the seat 11 places the left hand elbow on the armrest 51 and places the wrist on the auxiliary armrest 52. The wrist can be placed on the wrist platform 12 via the wrist, and the wrist is supported just near the side of the handle 6.
Therefore, the operator can grip the handle 6 or operate the operation lever in the vicinity with the hand resting on the wrist rest 12, so that the driving operation can be performed easily.
In addition, when the auxiliary armrest 52 is inverted through the joint 52, the wrist rest 12 can be switched to the storage position located on the rear side of the back support 50 as shown by a dotted line. In addition, the wrist platform 12 does not prevent the operator from getting on and off.
[0024]
The air supply port 14 of the bonnet 3 shown in FIGS. 1 and 2 is formed in the bonnet 3 by swelling the guide wall 55 laterally on both rear side walls of the bonnet 3 and opening the rear end. Is blown from the air supply port 14 to the wall surface 5a of the cabin 5 so as to form an air curtain.
Thereby, the dust or the like that is wound up by the crawler traveling device 1 and tends to adhere to the wall surface 5a during traveling is blown to the side by the cooling exhaust air discharged from the air supply port 14 and is prevented from adhering to the wall surface 5a. In addition, the front view of the window surface 5a formed of the transparent member is not impaired.
[0025]
【The invention's effect】
The present invention configured as described above has the following effects.
A roller support piece that supports a pair of front and rear wheels is provided with a regulating surface that is substantially parallel to the lower surface of the traveling frame when the roller supporting piece is in a horizontal state, and the regulating surface and the lower surface of the traveling frame are formed. In the gap formed by the above, it is possible to mount a flat regulating plate, so that the gap is filled with the regulating plate, and further above the side where the regulating plate is mounted from the substantially horizontal state of the rolling wheel support piece. Swing is disabled, and the upward swing of the wheel can be restricted.
Therefore, even when a work machine such as a front dozer is mounted on the machine and the machine body weight center fluctuates back and forth, the machine can perform smooth running without pitching or the like without greatly inclining toward the work machine mounting side. . At this time, since the rolling wheel support piece and the traveling frame regulate the swing by contacting the wide surface of the regulating plate, wear due to the contact can be prevented, and the flat regulating plate requires manufacture of the regulating plate. It can be simple and inexpensive.
[0026]
And the crawler traveling device without the regulating plate swings the front and rear wheels up and down in a balance-like manner through the wheel supporting piece with the pivot shaft as a fulcrum, so that the crawler is bent in accordance with the unevenness of the ground and the A smooth running in which pitching or the like is prevented can be performed, and a rolling wheel support structure that regulates the upward movement of the rolling wheel can be easily changed as necessary.
[Brief description of the drawings]
FIG. 1 is a side view of a tractor in which a front working machine is mounted on a traveling body provided with a crawler traveling device of the present invention.
FIG. 2 is a front view of the tractor with the front working machine of FIG. 1 removed.
FIG. 3 is a side view of a crawler traveling device provided with a lower wheel without a regulating plate.
FIG. 4 is a side view showing the lower wheel structure shown in FIG. 3;
FIG. 5 is a sectional view taken along line AA of FIG. 4;
FIG. 6 is a side view showing the configuration of the wheel supporting piece of FIG. 4;
FIG. 7 is a side view in which a regulating plate is provided on the wheel supporting piece of FIG. 4;
FIG. 8 is a sectional view taken along line AA of FIG. 7;
FIG. 9 is a side view of a lower wheel structure tried prior to the present invention.
FIG. 10 is a front view showing the structure of the rotation stopper of FIG. 9;
FIG. 11 is a plan view showing an armrest mechanism installed in the control section of FIG. 1;
FIG. 12 is a perspective view of the armrest mechanism of FIG. 11;
[Explanation of symbols]
1 Crawler traveling device (traveling device)
2 traveling machine body 15 crawler 16 drive wheel 17 traveling frame 19 driven wheel 20 lower rolling wheel 22 rolling wheel 26 pivot shaft 29 rolling wheel support piece 33 regulating surface 35 contact portion 36 regulating plate A tractor (work vehicle)
H gap

Claims (1)

The front and rear rolling wheels (22) and (22) are pivotally supported on a rolling wheel supporting piece (29) provided on a traveling frame (17) with a pivot shaft (26) as a fulcrum. ), (22) in a crawler traveling device for guiding the inner peripheral surface on the ground side of a crawler (15) wound around a driving wheel (16) and a driven wheel (19). When the wheel supporting piece (29) is in a horizontal state, a regulating surface (33) is formed substantially parallel to the lower surface of the traveling frame (17), and the regulating surface (33) and the lower surface of the traveling frame (17) are formed. The flat plate-shaped regulating plate (36) is attached to the gap (H) between the roller support piece (29) and the further upward swing of the side on which the regulating plate (36) is attached from the substantially horizontal state of the wheel supporting piece (29). Crawler running, characterized in that the upward rotation of the rolling wheel (22) can be restricted. The rolling wheel support structure of the location.

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