JP3816651B2 - Steering operation part structure of work vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steering operation unit structure for a work vehicle.
[0002]
[Prior art]
As a conventional steering operation unit structure of a work vehicle, a hydrostatic drive speed change mechanism (hereinafter referred to as “HST”) is interposed between a prime mover and a left and right traveling unit. The left and right traveling hydraulic motors are linked and connected to the pump, and the steering operation tool is linked to the left and right traveling hydraulic motors via the linkage mechanism. It is known that the traveling units are linked and linked, and a lockup mechanism is interposed between the left and right traveling hydraulic motors and the left and right traveling units.
[0003]
Such a lock-up mechanism comprises a differential gear mechanism interposed between the drive shafts of the left and right traveling units, and when the steering operation tool is in a neutral state, the left and right drive shafts are differentially locked, The straight running stability is improved by making the traveling speeds substantially the same.
[0004]
[Problems to be solved by the invention]
However, in the above-described steering operation unit structure of a work vehicle, since the lock-up mechanism is interposed between the HST and the left and right traveling units, the structure of the mission becomes complicated, and assembling and maintenance are difficult. However, there was a problem that the aircraft could not be reduced in weight and size.
[0005]
[Means for Solving the Problems]
Therefore, the present invention provides a traveling hydraulic motor in each of the left and right traveling units, and a pair of variable flow control pumps are linked to both the traveling hydraulic motors, and the variable flow control pumps are steered via the left and right control wires. Work that enables the swivel operation by rotating the swash plate rotation shaft of the variable flow rate control pump via the left and right control wires with the steering operation tool and the main transmission lever linked by interlocking the operation tool and the main transmission lever In the vehicle steering operation structure, a swash plate rotation for rotating the swash plate rotation shaft via at least one of the left and right control wires separately from the steering operation tool and the main speed change lever. Means were provided.
[0006]
In addition to the steering operation tool and the main speed change lever , there is provided swash plate rotation means for rotating the swash plate rotation shaft via the left and right control wires, and both swash plate rotations are provided. A reverse rotation interlocking mechanism is interposed between the means, and the reverse rotation interlocking mechanism is configured to rotate the left and right swash plate rotation axes in opposite directions.
[0007]
Further, at the neutral position of the steering operation tool, the swash plate rotating shaft is configured to be rotated by the swash plate rotating means so that the traveling speeds of the left and right traveling portions are substantially the same.
[0008]
Further, the left and right swash plate rotation shafts are configured to be rotated by the swash plate rotation means in conjunction with the turning operation of the steering operation tool.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The steering operation unit structure for a work vehicle according to the present invention includes a left and right traveling unit disposed in a lower part of the body frame, a traveling hydraulic motor provided in each of the left and right traveling units, and a pair of variable flow rates for both traveling hydraulic motors. The control pumps are linked to each other, the steering operation tool and the main transmission lever are linked to both variable flow rate control pumps via the left and right control wires, and the variable flow rate is controlled via the left and right control wires by the steering operation tool and the main transmission lever . The swash plate can be turned by turning the swash plate turning shaft of the control pump, and the swash plate can be provided via at least one of the left and right control wires separately from the steering operation tool and the main transmission lever. A swash plate rotating means for rotating the rotating shaft is provided.
[0010]
Therefore, by rotating the swash plate rotating shaft of the variable flow rate control pump by the swash plate rotating means, the traveling speed of the traveling unit can be adjusted with a simple configuration, and the straight running stability of the airframe can be improved. Is something that can be done.
[0011]
In addition to the steering operation tool and the main speed change lever , there is provided swash plate rotation means for rotating the swash plate rotation shaft via the left and right control wires, and both swash plate rotations are provided. A reverse rotation interlocking mechanism is interposed between the means, and the reverse rotation interlocking mechanism is configured to rotate the left and right swash plate rotation shafts in opposite directions.
[0012]
Therefore, by rotating both swash plate rotating means simultaneously in the opposite directions, the traveling speed of the traveling unit can be quickly adjusted, and the straight running stability of the aircraft can be further improved. It is.
[0013]
Further, the swash plate rotation shaft is configured to be rotated by the swash plate rotation means so that the traveling speeds of the left and right traveling portions are substantially the same at the neutral position of the steering operation tool.
[0014]
Therefore, by rotating the swash plate rotation shaft and causing the left and right traveling portions to travel at substantially the same speed, the aircraft can be surely moved straight and the straight running stability of the aircraft can be improved. .
[0015]
In addition, since the airframe can be moved straight with a simple configuration, it is possible to improve assemblability and maintainability and to reduce the size and weight of the airframe.
[0016]
Further, the left and right swash plate rotation shafts are configured to be rotated by the swash plate rotation means in conjunction with the turning operation of the steering operation tool.
[0017]
Therefore, when the steering operation tool is slightly turned, in addition to the action of the interlocking mechanism linked to the steering operation tool, the swash plate is also rotated by the swash plate rotating means, so that the aircraft can be quickly moved. It is possible to improve the steering operation feeling of the driver.
[0018]
【Example】
Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.
[0019]
FIG. 1 shows a general-purpose combine 1 having a steering operation structure A for a work vehicle according to the present invention. The combine 1 is a pair of left and right crawler type left and right traveling parts 3L at the lower part of a body frame 2. , 3R, a cutting part 4 is disposed at the front end of the body frame 2 so as to be movable up and down, a driving part 5 is disposed at the right front part of the body frame 2, and the prime mover is located immediately below the operating part 5 The storage unit 7 is disposed immediately after the operation unit 5, and the threshing unit 8 and the sorting unit 9 are disposed vertically on the left side of the storage unit 7. A waste disposal unit 10 is disposed immediately after the threshing unit 8 and the sorting unit 9, and a transport unit 11 is disposed between the cutting unit 4 and the threshing unit 8.
[0020]
Then, the crops in the field are cut by the cutting unit 4, the harvested crops are transferred to the threshing unit 8 by the transfer unit 11, the crops are threshed in the threshing unit 8, and the threshed grains are selected by the selection unit 9, and then refined. The grains are stored in the storage unit 7, while the crop straw is shredded by the waste disposal unit 10 and released to the outside.
[0021]
The driving unit 5 stands with a steering column 13 in front of the seat 12 with a space therebetween, and a steering wheel as a steering operation tool 14 is rotatably disposed above the steering column 13. A main transmission lever 15 is disposed at a left side position of 13 so as to be tiltable forward and backward.
[0022]
As shown in FIG. 2, the prime mover unit 6 has an HST 17 linked to the prime mover 16 via a transmission mechanism 18, and left and right traveling units 3L and 3R linked to the HST 17. The HST 17 has variable flow rates on the left and right sides. The control pumps 19L and 19R and the left and right traveling hydraulic motors 20L and 20R linked to the left and right variable flow rate control pumps 19L and 19R, respectively, are configured. In the figure, 21L and 21R are drive sprockets.
[0023]
The motor unit 6 is also provided with a steering vehicle operating unit structure A for enabling a turning operation by the steering operating tool 14.
[0024]
That is, as shown in FIGS. 2 and 3, swash plate rotation shafts 22L and 22R of the left and right variable flow rate control pumps 19L and 19R are linked to the steering operation tool 14 via the linkage mechanism 23 and the right side. A swash plate rotating means 24R for rotating the swash plate rotating shaft 22R is connected to the swash plate rotating shaft 22R.
[0025]
The interlocking mechanism 23 has a rectangular box-shaped operating table 25 connected to the lower portion of the steering column 13, and a steering shaft 26 is erected on the upper portion of the operating table 25 so as to be rotatable. At the same time, the steering operation tool 14 is attached, and a pinion gear 27 is attached to the base end of the steering support shaft 26. Lever 15 is connected. In addition, a slide shaft 29 is horizontally installed along the main transmission shaft 28 inside the operation console 25, and a base portion 30a of the slide operating body 30 is placed along the slide shaft 29 in the middle of the slide shaft 29. The rack 30b is connected to the base 30a of the slide acting body 30, and the pinion gear 27 is engaged with the rack 30b.
[0026]
The left and right slide bodies 31, 32 are slidably mounted along the two shafts 28, 29 on the left and right sides of the main transmission shaft 28 and the slide shaft 29. The main transmission shaft 28 is loosely fitted so as not to rotate with the rotation of the transmission shaft 28.
[0027]
In the main transmission shaft 28, left and right turning arm bodies 33, 34 are slidable along the main transmission shaft 28 on the outer sides of the left and right slide bodies 31, 32, and as the main transmission shaft 28 rotates. The left and right turning arm bodies 33 and 34 are urged toward the left and right slide bodies 31 and 32 by springs 35 and 36, respectively.
[0028]
At the rear part of the left and right slide bodies 31, 32, a substantially central portion of a left and right guide body 37, 38 having a substantially U-shaped cross section in a side view is pivotally attached, and the left and right slide bodies 37, 38 are mounted on the outer side of the left and right guide bodies 37, 38. The rotating arm bodies 33 and 34 are connected.
[0029]
The left and right rotors 39 and 40 are attached to the left and right guide bodies 37 and 38 so as to be movable along the left and right guide bodies 37 and 38. The left and right rotors 39 and 40 are attached to the left and right swash plate operation arms 41 and 42, respectively. The left and right swash plate operating arms 41 and 42 are rotatably attached to the outer end, and are supported on the operating table 25 by the support shafts 41a and 42a.
[0030]
The left and right control wires 43 and 44 are attached to the inner ends of the left and right swash plate operating arms 41 and 42, and the left and right variable flow control pumps 19L and 19R are connected to the distal ends of the left and right control wires 43 and 44. The moving shafts 22L and 22R are connected via swash plate rotating bodies 45L and 45R.
[0031]
When the steering operation tool 14 and the main transmission lever 15 are in the neutral position, as shown in FIG. 5, the left and right guide bodies 37 and 38 and the left and right swash plate operation arms 41 and 42 are in a horizontal state. It has become.
[0032]
In this state, when the main transmission lever 15 is shifted to the forward shift position, the main transmission shaft 28 rotates forward, and the left and right rotation arm bodies 33, 34 rotate forward. As shown in FIG. 6, the outer sides of the left and right guide bodies 37 and 38 move upward, and accordingly, the left and right swash plate operating arms 41 and 42 are in the inclined state shown in FIG.
[0033]
In this case, since the left and right swash plate rotation shafts 22L and 22R are rotated forward by substantially the same angle by the left and right control wires 43 and 44 connected to the left and right swash plate operation arms 41 and 42, 3L and 3R will move forward at approximately the same traveling speed, so the aircraft will go straight.
[0034]
Further, when the steering operation tool 14 is turned leftward from the above state, the slide acting body 30 moves to the left side, and only the left slide body 31 moves to the left side against the biasing force of the spring 35. As shown in FIG. 7, only the left guide body 37 moves to the left while maintaining the tilted state. Accordingly, only the left swash plate operating arm 41 is in a substantially horizontal state as shown in FIG. It becomes.
[0035]
In this case, the left swash plate rotation shaft 22L is returned to a substantially neutral state by the left control wire 43 connected to the left swash plate operation arm 41, so that the traveling speed of the left traveling unit 3L is the same as that of the right traveling unit 3R. Slightly slower than the running speed, so the aircraft turns slowly to the left.
[0036]
Furthermore, when the steering operation tool 14 is turned in the left turning direction from the above state, only the left guide body 37 moves further to the left as shown in FIG. As shown in FIG. 8, the plate operation arm 41 is inclined in the direction opposite to the right swash plate operation arm 42.
[0037]
In this case, since the left swash plate rotation shaft 22L is rotated backward by the left control wire 43 connected to the left swash plate operation arm 41, the traveling speed of the left traveling unit 3L is the same as that of the right traveling unit 3R. Compared to the traveling speed, the speed will be significantly reduced, so the aircraft will turn sharply to the left.
[0038]
As described above, the steering operation can be performed by the steering operation tool 14.
[0039]
Next, the swash plate rotating means 24R will be described. As shown in FIG. 3, the swash plate rotating means 24R has a linear actuator 46 attached to the body frame 2 and is movable at the tip of the forward / backward rod 46a of the linear actuator 46. A receiving plate 47 is provided continuously, and the tip of the outer wire 44a of the right control wire 44 is attached to the movable receiving plate 47, and the tip of the inner wire 44b that is movably inserted into the outer wire 44a is inclined to the right side. It is connected to the end of the plate rotating body 45R. The tip of the outer wire 43a of the left control wire 43 is attached to a fixed receiving plate 48 fixed to the left variable flow rate control pump 19L, and the tip of the inner wire 43b movably inserted through the outer wire 43a is It is connected to the end of the swash plate rotating body 45L.
[0040]
When the linear actuator 46 is driven and the advance / retreat rod 46a is advanced, the right control wire 44 rotates the right swash plate rotation shaft 22R to the speed increasing side, and the right traveling portion 3R travels. When the speed is increased while the forward / backward rod 46a is retracted, the right swash plate rotation shaft 22R rotates to the deceleration side to decrease the traveling speed of the right traveling unit 3R.
[0041]
In this way, the right swash plate rotation shaft 22R can be rotated by the action of the swash plate rotation means 24R to adjust the traveling speed of the right traveling portion 3R.
[0042]
As shown in FIG. 2, the linear actuator 46 is connected to a controller 49. The controller 49 includes a steering angle sensor 50 for detecting the steering angle of the steering operation tool 14, a left and right traveling unit 3L, Left and right traveling speed sensors 51L and 51R for detecting the traveling speed of 3R are connected.
[0043]
When the steering angle sensor 50 detects that the steering operation tool 14 is in the neutral position, the controller 49 detects the traveling speeds of the left and right traveling units 3L and 3R using the left and right traveling speed sensors 51L and 51R. When there is a difference between the traveling speeds of the left and right traveling units 3L and 3R, the linear actuator 46 is driven to control the traveling speeds of the left and right traveling units 3L and 3R to be substantially the same.
[0044]
In this way, when the steering operation tool 14 is in the neutral position, by making the traveling speeds of the left and right traveling portions 3L and 3R substantially the same, the aircraft can be surely moved straight and the straight running stability of the aircraft can be improved. Can be improved.
[0045]
In addition, unlike the conventional lock-up mechanism, the airframe can be moved straight with a simple configuration, so that the assembly and maintenance can be improved, and the airframe can be reduced in size and weight.
[0046]
Further, in the conventional lockup mechanism, if the differential device breaks down while traveling, it becomes impossible to travel, but in the present invention, even if the controller 49 breaks down, the aircraft can travel. it can.
[0047]
FIG. 4 is a view showing a steering operation structure A ′ of a work vehicle as a second embodiment. In this embodiment, the left and right variable flow rate control pumps 19L, 19R swash plate rotation shafts 22L, Left and right swash plate rotating means 24L, 24R are connected to 22R, and a reverse rotation interlocking mechanism 52 is provided between both swash plate rotating means 24L, 24R.
[0048]
That is, the left and right swash plate rotating means 24L, 24R are attached to the left and right movable receiving plates 53L, 53R with the tips of the outer wires 43a, 44a of the left and right control wires 43, 44, and are movably inserted into the outer wires 43a, 44a. The tips of the inner wires 43b and 44b are connected to the ends of the left and right swash plate rotating bodies 45L and 45R, and the left and right movable receiving plates 53L and 53R are connected to the linear actuator 46.
[0049]
Further, the reverse rotation interlocking mechanism 52 pivotally attaches two connecting rods 55 and 56 to a bracket 54 attached to the body frame 2 so as to be pivotable in the horizontal direction at intervals, and ends of both connecting rods 55 and 56. Interlocking rods 57 and 58 are pivotally attached to each other, and a parallel link is formed by both coupling rods 55 and 56 and both interlocking rods 57 and 58. 53L and 53R are attached, respectively, while the tip of the advance / retreat rod 46a of the linear actuator 46 attached to the bracket 54 is connected to the middle of the connecting rod 55.
[0050]
When the linear actuator 46 is driven and the advance / retreat rod 46a is advanced, the right control wire 44 rotates the right swash plate rotation shaft 22R to the speed increasing side, and the right traveling portion 3R travels. When the speed is increased and the left control wire 43 causes the left swash plate rotation shaft 22L to rotate to the deceleration side to decrease the traveling speed of the left traveling section 3L, while the advance / retreat rod 46a is retracted The right control wire 44 rotates the right swash plate rotation shaft 22R to the deceleration side to reduce the traveling speed of the right traveling portion 3R, and the left control wire 43 rotates the left swash plate. The shaft 22L rotates to the speed increasing side to increase the traveling speed of the left traveling unit 3L.
[0051]
As described above, the left and right swash plate rotating shafts 22L and 22R are rotated by the operation of the left and right swash plate rotating means 24L and 24R and the reverse rotation interlocking mechanism 52, and the traveling speeds of the left and right traveling portions 3L and 3R are increased. It can be adjusted quickly.
[0052]
Also in the present embodiment, the linear actuator 46 is connected to the controller 49, and the controller 49 is connected to the steering angle sensor 50 and the left and right traveling speed sensors 51L and 51R.
[0053]
When the steering angle sensor 50 detects that the steering operation tool 14 has been turned slightly to the left or right, the controller 49 causes the left and right control wires 43 and 44 to be moved to the left and right swash plates by the interlock mechanism 23 described above. In addition to rotating the rotating shafts 22L and 22R, the linear actuator 46 is further advanced and retracted to rotate the left and right swash plate rotating shafts 22L and 22R, so that the aircraft quickly turns in the turning operation direction. I am doing so.
[0054]
As described above, when the steering operation tool 14 is turned slightly, the airframe is quickly turned, so that the driver's feeling of steering operation can be improved.
[0055]
【The invention's effect】
The present invention is implemented in the form described above, and has the effects described below.
[0056]
(1) In the first aspect of the present invention, a traveling hydraulic motor is provided in each of the left and right traveling units, a pair of variable flow control pumps are linked to both traveling hydraulic motors, and the left and right control are controlled by both variable flow control pumps. interlockingly connected the steering operation member and the main change lever via a wire, turning by rotating the swash plate rotating shaft of the variable flow control pump via the left and right control wire by steering operation member and the main shift lever In the steering operation unit structure of a work vehicle that can be operated, the swash plate rotation shaft is rotated via at least one of the left and right control wires separately from the steering operation tool and the main transmission lever . Therefore, the traveling speed of the traveling unit can be adjusted with a simple configuration, and therefore the straight running stability of the aircraft can be improved with a simple configuration. wear.
[0057]
(2) In the present invention according to claim 2, a traveling hydraulic motor is provided in each of the left and right traveling units, and a pair of variable flow control pumps are linked to both traveling hydraulic motors. interlockingly connected the steering operation member and the main change lever via a wire, turning by rotating the swash plate rotating shaft of the variable flow control pump via the left and right control wire by steering operation member and the main shift lever A swash plate for rotating the swash plate rotation shaft via the left and right control wires separately from the steering operation tool and the main speed change lever in the steering operation unit structure of a work vehicle that can be operated. A rotation means is provided, and a reverse rotation interlocking mechanism is interposed between the two swash plate rotation means. The reverse rotation interlocking mechanism is configured to rotate the left and right swashplate rotation shafts in opposite directions. Have Therefore, the traveling speed of the traveling unit can be adjusted quickly, and the straight running stability of the aircraft can be further improved.
[0058]
(3) In the present invention described in claim 3, the swash plate rotation shaft is rotated by the swash plate rotation means so that the traveling speeds of the left and right traveling portions are substantially the same at the neutral position of the steering operation tool. Since it is configured to move, the aircraft can surely go straight, and the straight running stability of the aircraft can be improved.
[0059]
In addition, since the airframe can be moved straight with a simple configuration, it is possible to improve assemblability and maintainability and to reduce the size and weight of the airframe.
[0060]
(4) In the present invention according to claim 4, since the swash plate rotating means is configured to rotate the left and right swash plate rotation shafts in conjunction with the turning operation of the steering operation tool. When the steering operation tool is turned slightly, the airframe can be turned quickly, and the driver's feeling of steering operation can be improved.
[Brief description of the drawings]
FIG. 1 is a side view showing a combine equipped with a steering operation unit structure according to the present invention.
FIG. 2 is an explanatory diagram showing a steering operation unit structure.
FIG. 3 is an explanatory diagram showing a steering operation unit structure.
FIG. 4 is an explanatory diagram showing a steering operation unit structure as a second embodiment.
FIG. 5 is an explanatory view showing the operation of the interlocking mechanism in a neutral state.
FIG. 6 is an explanatory view showing the operation of the interlocking mechanism in the forward state.
FIG. 7 is an explanatory view showing the operation of the interlocking mechanism during a left turn.
FIG. 8 is an explanatory diagram showing the operation of the interlocking mechanism during a sudden left turn.
[Explanation of symbols]
1 Combine 2 Airframe frame
3L, 3R Left and right traveling part 4 Mowing part 5 Driving part 6 Motor part
14 Steering controls
15 Main transmission lever
16 prime mover
17 HST
19L, 19R variable flow control pump
20L, 20R Travel hydraulic motor
22L, 22R swash plate rotation axis
23 Interlocking mechanism
24L, 24R swash plate rotating means
43,44 Left and right control wires
46 Linear actuator
47 Movable backing plate
48 Fixed backing plate
49 Controller
50 Steering angle sensor
51L, 51R Left and right travel speed sensor
52 Reverse rotation mechanism
53L, 53R Left and right movable backing plate

Claims (4)

The left and right traveling parts (3L, 3R) are each provided with a traveling hydraulic motor (20L, 20R), and a pair of variable flow control pumps (19L, 19R) are linked to both traveling hydraulic motors (20L, 20R). The steering operation tool (14) and the main speed change lever (15) are linked to both the variable flow rate control pumps (19L, 19R) via the left and right control wires (43, 44), and the steering operation tool (14) and The main transmission lever (15) enables the turning operation by rotating the swash plate rotation shaft (22L, 22R) of the variable flow control pump (19L, 19R) via the left and right control wires (43, 44). In the steering control unit structure of a work vehicle,
Separately from the steering operation tool (14) and the main transmission lever (15) , the swash plate rotation shaft (22L, 22R) is rotated via at least one of the left and right control wires (43, 44). A swash plate rotating means (24L, 24R) is provided for operating the steering control unit of the work vehicle. The left and right traveling parts (3L, 3R) are each provided with a traveling hydraulic motor (20L, 20R), and a pair of variable flow control pumps (19L, 19R) are linked to both traveling hydraulic motors (20L, 20R). The steering operation tool (14) and the main speed change lever (15) are linked to both the variable flow rate control pumps (19L, 19R) via the left and right control wires (43, 44), and the steering operation tool (14) and The main transmission lever (15) enables the turning operation by rotating the swash plate rotation shaft (22L, 22R) of the variable flow control pump (19L, 19R) via the left and right control wires (43, 44). In the steering control unit structure of a work vehicle,
Separately from the steering operation tool (14) and the main speed change lever (15) , the swash plate rotation shafts (22L, 22R) are rotated through the left and right control wires (43, 44). The plate rotation means (24L, 24R) is provided, and the reverse rotation interlock mechanism (52) is interposed between the two swash plate rotation means (24L, 24R), and the reverse rotation interlock mechanism (52) A steering operation unit structure for a work vehicle, characterized in that each of the plate rotation shafts (22L, 22R) is configured to rotate in opposite directions.   At the neutral position of the steering operation tool (14), the swash plate rotation shaft ( The steering operation portion structure for a work vehicle according to claim 1 or 2, wherein the steering operation portion structure is configured to rotate (22L, 22R).   The left and right swash plate rotation shafts (22L, 22R) are configured to be rotated by the swash plate rotation means (24L, 24R) in conjunction with the turning operation of the steering operation tool (14). A steering operation unit structure for a work vehicle according to claim 1 or 2.

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