JP2002154453A - Crawler running vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crawler running vehicle capable of easily performing a movement of a machine body in a narrow place and also alignment when a working machine is to be mounted while the risk that the machine body starts moving with undeliberate manipulation of a steering wheel/bar is avoided. SOLUTION: A combine 1 is equipped with a machine body to run with driving of crawler type running parts 8L and 8R, a shift lever 6 to change the range of running speed of the machine body, and a steering wheel 5 for steering the machine body, whereby the machine body is revolved in the direction of turning the steering wheel in the case the wheel 5 is turned to the neutral revolution operating region even if the shift lever 6 is in the neutral position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a crawler traveling vehicle such as a combine which steers an airframe by rotating a steering handle.

[0002]

2. Description of the Related Art In recent years, it has been proposed that a crawler traveling vehicle such as a combine vehicle is provided with a round steering wheel and the like, and the body is steered in accordance with a rotation operation of the steering wheel. In this case, the traveling speed is changed by operating the separately provided traveling speed lever.

[0003]

By the way, a crawler traveling vehicle such as the one described above, in which when the traveling speed change lever is in the neutral position, turns the body in accordance with the turning operation of the steering wheel, Some systems maintain a stopped state regardless of the rotation operation. However, in the former case, when stopping the aircraft, not only the neutral operation of the traveling shift lever, but also the steering handle must be returned to the straight-ahead position, and the inconvenience that the aircraft starts to move in response to the unconscious steering wheel operation. is there. On the other hand, in the latter, it is possible to resolve the inconvenience of the former,
In this case, since the body cannot be turned on the spot, there is a disadvantage that it is difficult to move the body in a narrow place or to position the work machine when it is mounted.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems in view of the above-mentioned circumstances, and has a traveling body which travels in response to left and right crawler driving. A crawler traveling vehicle including a traveling shift lever that shifts a traveling speed of the traveling aircraft, and a steering handle that steers the traveling aircraft, wherein the crawler traveling vehicle has a traveling transmission lever in a neutral position. When the steering wheel is rotated to a predetermined neutral turning operation area, a neutral turning operation means for turning the body in the steering wheel turning operation direction is provided. In other words, since the aircraft can be turned on the spot based on the operation of the predetermined turning handle, the aircraft can be easily moved in a narrow place, and can be easily positioned when the work machine is mounted. When turning the aircraft with the gearshift lever in neutral, the aircraft needs to be rotated to the predetermined neutral swing operation area, so the aircraft stops without returning the steering handle to the straight-ahead position accurately. Not only is it not possible to maintain the state, but it is also possible to avoid the inconvenience that the aircraft starts to move in response to an unconscious steering operation. Also, the neutral turning operation area is secured at the end side of the steering wheel rotation operation area. In other words, when turning the body in a state where the traveling speed change lever is in a neutral state, a conscious steering wheel operation can be requested, so that the possibility that the aircraft body starts moving in response to an unconscious steering wheel operation can be further reduced. Further, the neutral turning operation means is characterized in that when the rotation operation position of the steering wheel is on the start end side of the neutral turning operation area, the aircraft is turned at a low speed. That is, there is an advantage that it is not permissible to avoid a trouble due to a sharp turn, and it becomes easier to move the machine in a narrow place or to align the work machine when it is mounted.

[0005]

Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, 1 is a combine, and the combine 1 is a pretreatment unit 2 for cutting stem culms, a threshing unit 3 for threshing cut stem culms, and selecting threshed grains, and sorted kernels. Tank (not shown) for storing oil, an operation unit 7 provided with a round steering handle 5 and a traveling speed change lever 6, and crawler-driven traveling units 8L and 8R provided on both left and right sides of the body bottom. Have. Further, in the operation area of the traveling speed change lever 6, a neutral position for stopping the body, and a forward speed change operation area secured at one of the neutral positions for performing a forward speed change operation of the body, and a neutral position And a reverse speed change operation area for performing a reverse speed change operation of the fuselage, the basic configuration of which is the same as that of the related art.

The power of the traveling parts 8L and 8R is supplied from a pair of HST transmissions (hydraulic continuously variable transmissions) each composed of HST pumps (variable displacement pumps) 9L and 9R and a traveling motor (not shown). The driving speed (including the driving direction) of each of the traveling units 8L and 8R is set to HST.
The control is performed based on the rotation of pump levers (trunnion levers) 10L and 10R provided on the pumps 9L and 9R. And each pump lever 10
L and 10R correspond to a traveling operation mechanism 11 that operates in response to the operation of the steering handle 5 and the traveling speed change lever 6.
They are linked and connected via the connecting wires 12L and 12R. Hereinafter, the configuration and operation of the traveling operation mechanism 11 will be described with reference to the drawings. However, in the traveling operation mechanism 11,
Since the operation mechanism for the left-side traveling unit and the operation mechanism for the right-side traveling unit are symmetrically formed on the front and back surfaces of the substrate 13, the corresponding members are denoted by the same reference numerals and the description is shared.

The traveling operation mechanism 11 includes an interlocking rod 14 that moves up and down in conjunction with the operation of the traveling speed change lever 6.
The upper end of the interlocking rod 14 is pivotally connected to one end of an operation arm 15 that rotates vertically about a support shaft 15a.
The operation arm 15 is formed in a branched shape so that the other end side sandwiches the substrate 13 from the front and rear.
A slide roller shaft 16 that moves up and down along the third guide groove 13a is engaged.

Reference numeral 17 denotes an interlocking arm connected to the slide roller shaft 16. The interlocking arm 17 extends obliquely upward and to the left and right at the distal end with a support shaft 18a as a fulcrum. The lower end of the rotating guide 18 is pivotally connected. An arc-shaped guide groove 18b is formed in the guide body 18 in the longitudinal direction, and a base end of an operation rod 19 is engaged with the guide groove 18b via a roller 20.

Reference numeral 21 denotes a bell crank that rotates about a support shaft 21a. One end of the bell crank 21 is pivotally connected to the tip of an operating rod 19, and the other end is
The pump lever 1 is connected via the connection wires 12L and 12R.
0L and 10R are connected. That is, when the traveling speed change lever 6 is operated, the interlock rod 14, the operating arm 1
The guide body 18 is rotated via the arm 5 and the interlocking arm 17, and an operation rod 19 accompanying the rotation of the guide body 18.
The bell crank 21 is rotated by pushing and pulling the connecting wires 12L, 12R in accordance with the rotation of the bell crank 21.
Turns the pump levers 10L and 10R. As described above, the traveling speed change operation path is configured symmetrically on the front and back of the substrate 13, and each of the traveling speed change operation paths is provided with a pump lever 10 </ b> L,
Since the 0R is rotated, a stepless traveling speed change operation by the traveling speed change lever 6 becomes possible.

The steering handle 5 is connected to a pinion gear 24 via a universal joint 22 and a bevel gear 23. A sector gear 25 meshing with the pinion gear 24 is rotatable left and right on a support shaft 25a as a fulcrum. Is pivoted to. Reference numeral 26 denotes a turning link provided on the front and back of the substrate 13, and the turning link 26
A roller 27 that rotates vertically with the fulcrum 6a as a fulcrum and that comes into contact with a shoulder 25b of the sector gear 25 from above is provided at an intermediate portion. Reference numeral 13b denotes a long hole through which the roller 27 on the back side passes through the substrate 13 and contacts the other shoulder 25b of the sector gear 25.

One end of the revolving link 26 is interlocked to a base end of the operating rod 19 (a support shaft of the roller 20) via a connecting plate 28.
Is in the neutral position, the turning link 26 and the connecting plate 2
The pivot point of the guide member 8 substantially coincides with the pivot point of the guide body 18. When the steering handle 5 is rotated, the sector gear 25 that rotates in conjunction with the steering handle 5 pushes up one roller 27, and one end of the revolving link 26 that moves upward is operated via the connection plate 28. The base end of the rod 19 is pulled up. As a result, the base end (roller 20) of the raised operating rod 19 is brought into contact with the guide body 1.
8 will move along the guide groove 18b.

The guide groove 18b of the guide body 18 has a circular arc whose center is the bell crank pivot point of the operating rod 19 and whose effective radius R1 is the radius of curvature when the traveling speed change lever 6 is neutrally operated. It is formed as a reference. Therefore, when the traveling speed change lever 6 is in the neutral position, even if the roller 20 of the operation rod 19 moves along the guide groove 18b with the rotation operation of the steering handle 5 (excluding a neutral turning operation range described later). , The operating rod 19 only rotates about the bell crank pivot point. However, when the guide body 18 is rotated by the shift operation of the traveling shift lever 6, the center of curvature of the guide groove 18b is shifted. When the roller 20 of the operating rod 19 moves along the guide groove 18b in accordance with the rotation operation of the steering handle 5, the operating rod 19 is displaced in the longitudinal direction to rotate the bell crank 21 and rotate the bell crank 21. The connection wires 12L and 12R rotate the pump levers 10L and 10R in accordance with the movement. That is, the HST pumps 9L and 9R are decelerated or rotated in reverse to steer (turn) the airframe. As described above, the airframe steering path is configured symmetrically on the front and back of the substrate 13, and each of the paths is steered. Since the pump levers 10L and 10R are turned in accordance with the turning operation of the steering handle 5, the body steering (turning operation) by the steering handle 5 becomes possible. still,
Reference numeral 29 denotes a spring mechanism that supports the other end of the turning link 26, and reference numeral 30 denotes a pair of left and right stoppers that regulate the rotation range of the sector gear 25. FIG. 4 is a front view of the traveling operation mechanism 11. In this figure, a two-dot chain line and a hatched portion indicate the movement of the traveling operation mechanism 11.

FIG. 5 is an explanatory view showing the shape of the guide groove 18b. In this figure, A is the position of the bell crank pivot point of the operating rod 19 when the traveling speed change lever 6 is in the neutral operation, the two-dot chain line is the guide groove reference shape, and the solid line is the guide groove shape of the present embodiment. The guide groove 18b is
As described above, at the time of the neutral operation of the traveling speed change lever 6, it is formed on the basis of an arc centered on the bell crank pivot point A of the operation rod 19 and whose effective radius R1 is a radius of curvature. The guide groove 18b of the present embodiment is formed so as to be displaced outward with respect to the reference shape so as to gradually displace the operation rod 19 in the pulling direction on the terminal side (less than half of the total length of the guide groove). Specifically, it is formed so as to be an arc having a radius of curvature R2 around a virtual point B located above the pivot point A. Therefore, the traveling speed change lever 6
When the steering handle 5 is rotated when the steering wheel is in the neutral position, in the normal operation area shown in FIG. 5, the operation rod 19 simply rotates and the traveling portions 8L and 8R maintain the stopped state. When the roller 27 moves to the start end of the neutral turning operation area shown in the figure, the operation rod 19 is slightly displaced in the pulling direction, and accordingly, the traveling portions 8L and 8R in the steering wheel rotating direction are slowly rotated in reverse to move the machine body in that position. To start a low-speed turn (reverse pivot turn). Further, when the roller 27 moves to the end side of the neutral turning operation area, the amount of pulling displacement of the operation rod 19 increases, and accordingly, the turning speed of the body increases.

In the vehicle constructed as described above, a traveling body that travels in accordance with the driving of the crawler traveling parts 8L and 8R, a traveling speed change lever 6 that changes the traveling speed of the traveling body, and an operation of the traveling body. The steering wheel 5 is provided with the steering wheel 5 in the neutral position. Even when the traveling speed change lever 6 is in the neutral position, when the steering wheel 5 is rotated to the predetermined neutral turning operation area, the steering wheel rotating operation direction is changed. , The aircraft can be turned on the spot. Accordingly, it is possible to easily perform the movement of the body in a narrow place and the positioning when the work machine is mounted, and when the body is turned with the traveling shift lever 6 in the neutral state, the steering handle 5 is used. Is required to rotate the steering wheel to a predetermined neutral turning operation area, so that it is not allowed to maintain the aircraft stopped state without accurately returning the steering handle 5 to the straight traveling position. The inconvenience that the aircraft starts to move accordingly can be avoided.

Further, since the neutral turning operation area is secured at the end side of the steering wheel turning operation area, it is necessary to request a conscious steering operation when turning the body with the traveling shift lever 6 in the neutral state. Can be
As a result, the possibility that the body starts moving in response to an unconscious steering operation can be further reduced.

Further, when the turning operation position of the steering handle 5 is at the starting end of the neutral turning operation area, the turning of the body at a low speed is not allowed, so that trouble due to a sharp turning cannot be avoided. There is an advantage that the movement and the alignment at the time of mounting the working machine are further facilitated.

In this embodiment, the traveling operation mechanism 11
Since the neutral turning operation is enabled by changing the shape of the guide groove of the guide body 18 provided in the above, there is an advantage that the operation can be performed without increasing the number of parts and complicating the structure.

The present invention is, of course, not limited to the above embodiment. For example, in the above embodiment, when the traveling speed change lever 6 is in the neutral position, the steering handle 5 is rotated to the neutral turning operation area. Then, only the traveling portions 8L and 8R in the steering wheel rotation direction are driven to rotate in the reverse direction to pivot-turn the body in the reverse direction, but the other traveling portions 8L and 8R may be simultaneously driven in the forward direction to perform the spin turn. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a combine.

FIG. 2 is an exploded perspective view of a travel operation mechanism (travel speed change operation path).

FIG. 3 is an exploded perspective view of a traveling operation mechanism (airframe steering route).

FIG. 4 is a front view of a traveling operation mechanism.

FIG. 5 is an explanatory view showing the shape of a guide groove.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combine 5 Steering handle 6 Traveling shift lever 8 Traveling part 9 Pump 10 Pump lever 11 Traveling operating mechanism 13 Substrate 18 Guide body 18b Guide groove 19 Operating rod 21 Bell crank 25 Sector gear 26 Swivel link

Continued on front page F-term (reference) 2B043 AA03 AB08 AB19 BA02 BA05 BB14 DB02 2B076 AA03 BA07 CD04 3D052 AA02 AA11 BB11 DD04 EE01 FF02 GG03 HH01 JJ00 3J070 AA03 AA13 BA34 DA24 EA11 EA31

Claims (3)

[Claims] 1. A crawler traveling vehicle comprising: a traveling body that travels in accordance with left and right crawler driving; a traveling speed change lever that changes a traveling speed of the traveling body; and a steering handle that steers the traveling body. In the crawler traveling vehicle, even when the traveling shift lever is in the neutral position, if the steering handle is rotated to a predetermined neutral pivot operation area, the neutral turning operation means turns the body in the steering wheel rotating operation direction. A crawler traveling vehicle characterized by comprising: 2. The crawler traveling vehicle according to claim 1, wherein the neutral turning operation area is secured at the end of the steering wheel rotation operation area. 3. The crawler traveling vehicle according to claim 1, wherein the neutral turning operation means causes the body to turn at a low speed when the rotation operation position of the steering wheel is on the starting end side of the neutral turning operation area. .