JP3515732B2 - Crawler traveling device for agricultural work vehicle and agricultural work vehicle using the crawler traveling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler traveling device using a crawler belt, and an improvement of agricultural work vehicles such as combine harvesters and tractors using the crawler traveling device.

[0002]

2. Description of the Related Art A crawler traveling device for an agricultural work vehicle as described above.
As a storage device and an agricultural vehicle using the storage device , the following structures have been conventionally known. [1] A plurality of grounding rollers that guide the grounding side of the inner circumference of the crawler belt are provided. Among these grounding rollers, the roller located in the middle of the grounding range is moved up and down around the fulcrum axis on the track frame. A movable wheel that is swingable and is provided with the movable wheel being biased downward (see, for example, Japanese Patent Laid-Open No. 10-67348).
[2] Equipped with a plurality of grounding wheels that guide the grounding side of the inner circumference of the crawler belt. Among these grounding rollers, a pair of rolling wheels located in the middle part of the grounding range is set around the fulcrum axis on the track frame. A movable wheel that can be oscillated by a balance (see, for example, Japanese Utility Model Laid-Open No. 2-78482).

[0003]

[Problems to be Solved by the Invention] [1] and [2]
According to the conventional technique described in (1), since the movable roller is provided in the middle part of the ground contact range of the crawler traveling device, the movable roller is retracted to the side away from the road surface when overcoming a step such as a ridge. By forming a partially recessed portion at the ground contact portion of the crawler belt, it is possible to reduce the inclination of the body in the riding posture. In other words, considering the traveling state in which the aircraft crosses the ridge, the aircraft gradually moves in the backward leaning posture while gradually increasing its angle from the start of climbing over the ridge to the middle part of the ground contact range of the crawler traveling device. After passing, the posture suddenly changes to the forward leaning posture.
The posture change at this time is such that the larger the rearward tilt angle immediately before the posture change is, the larger the head is, and the larger the impact is received. This is useful in that the impact due to the change in the front-back inclination can be mitigated. However, the movable crawler wheels employed in the conventional crawler traveling device and the vehicle using the crawler traveling device are provided at an intermediate position in the front-rear direction in the ground contact range of the crawler belt. For this reason, when turning the vehicle using this crawler traveling device, if a large lateral pressure due to mud on the grounding road surface acts on the front end side and the rear end side of the grounding range of the crawler belt, The function as a loop is completely useless. Therefore, when turning the aircraft, when either one of the left and right traveling devices is stopped and only the other is driven, or when the left and right traveling devices are driven in opposite directions to make a turn, the crawler A large amount of mud is removed by the crawler belt guided by the grounding rollers located at the front or rear end of the grounding range of the belt, or when the traveling road surface is hard, it receives a large frictional resistance between it and the grounding surface. Therefore, there is a problem that the crawler belt is largely deformed and damaged.

An object of the present invention is to provide a crawler traveling device for an agricultural work vehicle having a structure in which it is easy to avoid a large amount of mud pushing and damage to the crawler belt while turning the machine body while suppressing derailment of the crawler belt. And to provide an agricultural work vehicle using the crawler traveling device.

[0005]

[Invention of Claim 1] Technical means in a crawler traveling device of an agricultural vehicle according to the present invention, which has been devised to achieve the above object, is described in claim 1. As described above, a plurality of grounding rollers that guide the grounding side of the inner circumference of the crawler belt are provided, and among the plurality of grounding rollers, a grounding roller located at the front end in the grounding range of the crawler belt with respect to the traveling road surface, The track roller adjacent to the ground roller is separated from the track roller that has a fulcrum shaft at or near the location where the body center of gravity acts in a state where the machine frame is in a horizontal posture. Attach the balance around the front fulcrum shaft provided at the front of the
The rotation shaft of the grounded wheel and the front fulcrum shaft located in the middle thereof
And are linearly arranged, and a sled guide for preventing wheel disengagement is provided between the front and rear grounding wheels that swing around the front fulcrum shaft by the balance. It is configured to be swingable around the same axis as the front fulcrum shaft of the moving grounding wheel.

[0006] By having such a configuration, the ground rolling wheel positioned at the front end of the ground range, when subjected to a large lateral pressure to the crawler front with the body pivot, so that the ground rolling wheels of the front end allows the deformation of the crawler it can be the retracted displacement to increase side, to avoid an increase in excess lateral pressure against the front end of the crawler. And not just backward displacement,
The rearward displacement is limited by the other grounding wheel connected to the grounding roller that is displaced rearward so as to swing. In other words, when one of the ground contact wheels is displaced backward, the other ground contact roller applies a biasing force to the ground contact surface side to the inner peripheral surface of the crawler belt, so that the other ground contact roller reacts. As a support, the unlimited rearward displacement of the one grounding wheel is suppressed. For this reason, even though the movable wheel is provided at the front end of the grounding range, it is possible to prevent the crawler belt from coming off from the wheel due to lateral pressure received from mud or the like.

[0007]

Before and after the balance swings around the front fulcrum axis
A sled-shaped guide is installed between the grounded wheels to prevent the wheel from slipping off.
Since that, sled guide for derailing prevention be swings similarly to the ground track roller, without interfering with the function of the oscillation of the ground rolling wheels, yet much change the relative positional relationship between the ground track roller It is possible to maintain the desired derailment prevention function without doing so.

[Invention of Claim 2] As described in claim 2, a plurality of grounding wheels for guiding the grounding side of the inner circumference of the crawler belt are provided, and among the plurality of grounding rollers, the grounding roller with respect to the traveling road surface is provided. The grounding wheel located at the front end in the grounding range of the crawler belt and the grounding roller located adjacent to the grounding roller are located at the location where the body center of gravity acts in the state where the machine frame is in the horizontal posture, or Separately from the grounding wheel that has a fulcrum shaft nearby, it is mounted so that the balance can swing freely around the front fulcrum shaft provided in the front part of the track frame, and it is located between the rotation shaft of the front and rear grounding wheels and in the middle thereof. You
The front fulcrum shaft is linearly arranged, and a sled guide for preventing wheel disengagement is arranged between the front and rear grounding wheels that swing by a balance around the front fulcrum shaft. The guide uses a crawler traveling device that is configured to be swingable around the same fulcrum as the front fulcrum shaft of the grounding roller that swings the balance. The fulcrum shaft may be used also as a connecting shaft of the left and right track frames and a lifting drive mechanism for lifting and lowering the track frames separately for the left and right.

With this configuration, in addition to improving the turning performance of the crawler traveling device, the fulcrum shaft for swingably supporting the grounded wheel is also used as the connecting shaft of the elevating drive mechanism, It is also possible to reduce the score.

[0011]

[Overall structure]

A combine shown as an example of the agricultural work vehicle of the present invention is provided with a pair of left and right crawler traveling devices 1 on the lower side of a machine body frame 2 on which a threshing device is mounted, and is provided with a control part and a driving part on the front side of the threshing device. Further, the front part of the machine body on the front side is provided with a reaper that can be adjusted up and down.

[Crawler Traveling Device] FIGS. 1 and 2 show a crawler traveling device portion of a combine. The crawler traveling device 1 includes a track frame 10 that is connected to a machine body frame 2 via an elevating and lowering drive mechanism 3 which will be described later, and a tension play attached to a rear end of the track frame 10 in the machine body traveling direction. Rolling wheel 13
A grounding wheel 4 provided at a plurality of positions in the length direction of the track frame, a drive wheel 15 fixed to the body frame 2 side on the front side of the body, and the body frame at an intermediate position in the body front-rear direction. An upper guide wheel 16 fixed to 2,
These drive wheel 15, grounding wheel 4, tension free wheel 13,
And a crawler belt 17 made of rubber wound around the upper guide wheel 16.

The track frame 10 has a rectangular pipe-shaped main frame portion 11 connected to a pair of front and rear swing links 31 of the elevating and lowering drive mechanism 3, and a main frame portion 11 on the rear end side of the main frame portion 11. And an extension frame portion 12 in the form of a square pipe that is fitted in an inscribed state with respect to and is mounted so as to be able to move forward and backward in the longitudinal direction. The tension idle rotation is provided at the rear end of the extension frame portion 12. A wheel 13 is supported.

The tension free wheel 13 is supported by the extension frame portion 12 and is connected to the rear end portion of the main frame portion 11 by a position adjusting mechanism 14 using a screw mechanism. And track frame 1
The position can be adjusted and fixed in the zero length direction.

As shown in FIGS. 3 and 4, the grounding wheel 4 has a boss portion 42 fitted onto a fulcrum shaft 40 fixed to the track frame 10, and a balance arm pivotally supported so as to be swingable. It is rotatably supported by bearings 43 provided at both end positions of 41. As shown in the figure, the grounding roller 4 has a pair of front and rear grounding wheels 4 provided at three positions in the length direction of the track frame 10 so as to correspond to the grounding action area of the crawler belt 17. The center of gravity G of the machine body 2 in a horizontal posture acts on or near the fulcrum shaft 40, which is the swing center of the grounding roller 4 at the intermediate position, so that the centering wheel 4 of the grounding roller 4 can act. The position is set. Each ground roller 4 has a pair of rotary wheels 45 at both ends of a rotary shaft 44 rotatably supported by the bearing portion 43.
And the core bar projections 18 on the left and right of the crawler belt 17 as shown in FIGS.
It is configured to contact the inner peripheral surface of the crawler belt 17 at both left and right positions.

At the lower position of the balance arm 41, there is provided a sled-like guide 5 having a T-shaped cross section for preventing wheel slippage, which is integrally welded and fixed to the balance arm 41. The sled guide 5 is also configured to swing in conjunction with the movement. As shown in FIGS. 5 and 7, the sled-shaped guide 5 is located between the left and right core metal projections 18 of the crawler belt 17 and restricts the lateral movement of the crawler belt 17 to prevent the claw belt 17 from coming off. Exert the function of.

A drive wheel 15 and an upper guide wheel 16 are provided on the machine body frame 2 side. Of these, the drive wheel 15 is configured to transmit power from a transmission case fixed to the machine body frame 2, engage with the crawler belt 17, and transmit the drive force. The upper guide wheel 16 is
The crawler belt 17 is supported on the machine body frame 2 so as to rotate freely by contact with the inner peripheral surface on the upper side. Then, the slack on the upper side of the belt is restricted due to a slight change in the required winding length of the crawler belt 17 due to the vertical movement of the track frame 10 relative to the machine body frame 2 in the vertical direction and the change in the posture of forward and backward tilt. The arrangement position on the machine body frame 2 is set so as to be able to do so.

[Elevation Drive Mechanism] The elevation drive mechanism 3 connects the body frame 2 and the track frame 10 at two front and rear swing links 31.
And hydraulic cylinders 30 for individually swinging and driving the swing links 31 in front and rear thereof, which are provided in each of the left and right crawler traveling devices 1. Each of the front and rear swing links 31 is formed in a bell crank shape, and is swingably supported by the machine body frame 2 near its bending point. Then, the first extending arm portion 3 extending in one direction from this pivotal support point
2, the hydraulic cylinder 30 is connected, and the track frame 10 is pivotally connected to the second extending arm portion 33 in the other direction. Each extended arm portion 32, 3 of the swing link 31
As shown in FIG. 1, the second extension arm portion 33 of the track frame 10 toward the track frame 10 has a running posture in which the body frame 2 is at the lowest position, and has a posture extending to the rear side in the substantially horizontal direction. As shown in FIG. 2, in the running posture in which the body frame 2 is at the highest position, the body frame 2 is swung forward and downward from the above posture to shift the entire track frame 10 to the front lower side.

At this time, the movement on the hydraulic cylinder 30 side that controls the operation of the swing link 31 has the following control mode. [a] When the swing links 31 before and after the parallel lowermost position are in the state shown in FIG.
0 is in the shortest contracted posture, and the forward hydraulic cylinder 30 with respect to the front swing link 31 is in the maximum extended posture. As a result, the body frame 2 is in a posture substantially parallel to the traveling road surface, and is the lowest in the ground. [b] When the swing links 31 before and after the parallel highest position are in the state shown in FIG.
0 is in the maximum extension posture, and the forward hydraulic cylinder 30 with respect to the front swing link 31 is in the minimum contraction posture. As a result, the body frame 2 is in a posture substantially parallel to the traveling road surface, and is the highest in the ground. [c] Of the swing links 31 before and after the forward tilt position, the swing link 31 on the front side
1 in the state shown in FIG. 1, when the rear swing link is in the state shown in FIG. 2, the forward hydraulic cylinder 30 for the front swing link 31 and the backward hydraulic cylinder 30 for the rear swing link 31 , Both are in the maximum extension posture. As a result, the machine body frame 2 is in a forward leaning posture in which the front is low and the rear is high. [d] Of the swing links 31 before and after the backward tilt position, the swing link 31 on the front side
2 in the state shown in FIG. 2, when the rear swing link is in the state shown in FIG. 1, the forward hydraulic cylinder 30 for the front swing link 31 and the backward hydraulic cylinder 30 for the rear swing link 31 , Both are in the shortest contracted posture. As a result, the body frame 2 is in a rearward tilted posture in which the front is high and the rear is low.

As described in the above [a] to [d], by controlling the hydraulic cylinders 30 to adjust the swing angles of the swing links 31, respectively, in addition to the above-mentioned four types of postures, intermediate postures thereof are obtained. You can change the posture. Then, even between the left and right crawler traveling devices, it is possible to perform left and right rolling adjustments, pitching adjustments, and the like by selecting the above-described control form for each of the left and right, and it is possible to arbitrarily select the aircraft traveling posture. .

Of the swing links 31 used in the lifting drive mechanism 3, the rear swing link 31 is equipped with an auxiliary link 31a on the second extending arm portion 33 which is the connecting side with the track frame 10. The auxiliary link 31a is referred to as a swing link 31. The auxiliary link 31a is used as a link length changing unit when the body posture is tilted back and forth as described above, but each hydraulic cylinder 30 and each swing link that configure the lifting drive mechanism 3 are used. It is possible to absorb a slight dimensional accuracy error such as a manufacturing error of 31 itself, an assembling error, or a backlash due to long-term use, so that the lifting drive mechanism 3 can be operated smoothly. It is useful.
Then, the track frame 10 of the auxiliary link 31a
The end on the side, as shown in FIGS. 1, 2 and 6, 7.
Of each grounding wheel 4, it is connected to a fulcrum shaft 40 of a balance arm 41 of the grounding wheel 4 provided on the rear end side of the machine body. [Another Example of Embodiment] [ 1 ] The ground roller 4 is provided with respect to the track frame 10.
It is not limited to the one provided at three places, but may be provided at four places or five places or more. When the number of places provided is an even number, in relation to the body weight center G, the grounding roller closest to the center is provided. The position of the body weight center G may be set between the four points. [ 2 ] The connection between the swinging link 31 of the lifting drive mechanism 3 and the fulcrum shaft 40 of the grounding roller 4 is not limited to the one using the fulcrum shaft 40 of the rearmost grounding roller 4, but the swinging link 31 may be used. An arbitrary fulcrum shaft 40 can be set as appropriate in consideration of the relationship with the arrangement position on the side. [ 3 ] The ground contact wheel 4 is not limited to the one formed by a pair of front and rear two wheels, but may be formed by three wheels. [ 4 ] It is not necessary to configure all of the grounding wheels 4 mounted on the track frame 10 in the balance swing type. For example, the grounding wheels 4 are fixedly supported by the track frame between the ground swinging wheels 4 of the balance swinging type. It is also possible to provide a grounding wheel or a structure in which a movable wheel is attached to a conventional downwardly-biased rod-like arm near the center of the grounding area of the crawler belt 17. Absent.

[0022]

According to the first aspect of the present invention, when a large lateral pressure is applied to the front end side of the crawler traveling device due to the turning of the machine body, the grounding roller at the front end side portion can swing by the balance. As a result, the upward backward displacement is allowed to some extent. This reduces the ground contact pressure of the ground contact wheels on the front end side of the ground contact area during turning of the airframe, causing a large amount of mud pushing on the side surface of the crawler belt at the ground contact roller location or excessive deformation of the crawler belt itself. It is easy to avoid wheel derailment or damage.
Also, it is expected that it will be used by fixing it to the conventional truck frame.
The sled-shaped guide for preventing derailment, which was conceived, is the same as the grounding roller.
By oscillating and displacing
The relative positional relationship with the grounded wheel is changed without disturbing the function.
Maintain the condition that the grounding roller is not
It is possible to achieve the function of preventing wheel loss during the period .

According to the second aspect of the present invention, in addition to the improvement of the turning performance of the crawler traveling device, the fulcrum shaft for swingably supporting the grounded roller is used as the connecting shaft of the lifting drive mechanism. This is also useful for reducing the number of parts and cost reduction.

[Brief description of drawings]

FIG. 1 is a side view showing the entire crawler traveling device.

FIG. 2 is a side view showing the entire crawler traveling device.

FIG. 3 is a partially cutaway side view showing a grounded wheel portion.

FIG. 4 is a partially cutaway plan view showing a grounded wheel portion.

FIG. 5 is a partially cutaway rear view of the grounded wheel portion.

FIG. 6 is a partially cutaway plan view of a grounding wheel portion at a rear end side portion.

FIG. 7 is a partially cut-away rear view of the grounding wheel portion at the rear end side portion.

[Explanation of symbols]

Grounding roller 4 Crawler belt 17 Airframe frame 2 Truck frame 10 Fulcrum shaft 40 Sled guide 5 Lift drive mechanism 3

Front page continued (72) Inventor Ten Okuyama 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Inventor Mikio Omori 64, Ishizukita-machi, Sakai City Osaka Prefecture Kubota Sakai Factory Co., Ltd. 72) Inventor Nobuo Amasaki 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Co., Ltd. in Sakai Works (56) References JP 10-67347 (JP, A) JP 8-253177 (JP, A) (58) ) Fields surveyed (Int.Cl. ⁷ , DB name) B62D 55/08 A01D 67/00 B62D 55/116 B62D 55/14

Claims (2)

(57) [Claims] 1. A grounding roller that guides a grounding side of an inner circumference of a crawler belt, and among the plurality of grounding rollers, a grounding roller located at a front end in a grounding range of the crawler belt with respect to a traveling road surface. , The grounding wheel adjacent to the grounding wheel is a track other than the grounding wheel having a fulcrum shaft at or near the position where the body center of gravity acts in the state where the body frame is in the horizontal posture. The front part is mounted on the front part of the frame so that the balance can swing about a front fulcrum shaft, and is located between the rotation shafts of the front and rear grounding wheels and the middle thereof.
A fulcrum shaft is linearly arranged, and a sled guide for preventing wheel disengagement is arranged between the front and rear grounding wheels that swing by a balance around the front fulcrum shaft. A crawler traveling device for an agricultural vehicle that is configured to be swingable around the same axis as the front fulcrum shaft of a grounding roller that swings. 2. A ground contact wheel for guiding the ground contact side of the inner circumference of the crawler belt, wherein a ground contact wheel located at the front end of the ground contact area of the crawler belt with respect to the traveling road surface. , The grounding wheel adjacent to the grounding wheel is a track other than the grounding wheel having a fulcrum shaft at or near the position where the body center of gravity acts in the state where the body frame is in the horizontal posture. The front part is mounted on the front part of the frame so that the balance can swing about a front fulcrum shaft, and is located between the rotation shafts of the front and rear grounding wheels and the middle thereof.
A fulcrum shaft is linearly arranged, and a sled guide for preventing wheel disengagement is arranged between the front and rear grounding wheels that swing by a balance around the front fulcrum shaft. A crawler traveling device that is configured to be swingable around the same fulcrum shaft as the front fulcrum shaft of the grounding roller that swings by a balance is used. The agricultural work vehicle is configured such that the fulcrum shaft of is also used as a connecting shaft of the left and right track frames and an elevating and lowering drive mechanism for vertically elevating and driving the track frames.