JP2000135022A - Combine harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combine harvester capable of compacting a machine body, preventing both feet of an operator from exposing relatively to a reaping part and improving the operating efficiency by integrally installing a cover unit covering the front side of step boards. SOLUTION: This combine harvester is obtained by installing step boards 134a and 134b on both left and right sides of a steering column 71 and further arranging a cover unit 255 for covering the front side of the step boards 134a and 134b. The left and right lateral ends of the cover unit 255 are formed into a state curved toward the rear, and the edge on the left side of the cover unit 255 is joined to the front edge of a sidewall of a side column 72 provided on the left side of a driver's stand. The step board 134b on the right side of the steering column 71 is horizontally stretched and the step board 134a on the left side of the steering column 71 is tilted and stretched with a forward rising slope. A side mirror 171 is preferably attached to the steering column 71 and a display device for displaying operating conditions is preferably arranged on the top surface at the front near a steering wheel 19 of the side column 72 installed on the left side of the driver's stand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile agricultural machine such as a combine for continuously cutting and threshing grain culm in a field.

[0002]

2. Description of the Related Art In the case of a self-propelled vehicle having a crawler traveling device such as a combine, the course correction and turning are usually performed by operating the left and right side clutch levers, but recently, the operation is performed by operating a round handle like a general automobile. There is.

[0003]

The conventional wide front column provided with the left and right side clutch levers is erected at the front of the driver's cab substantially in the full left and right width, so that the work between the front column and the rear driver's seat is performed. It is necessary to secure a space to put the feet of the driver and put them on. However, the recent steering column with a round handle is a torso, and if it stands almost at the center of the front of the cab, it works on the left and right sides of the steering column Space to put the feet of the person
There is an advantage that the body can be made compact. However, the steering column does not have the function of covering the front sides of both feet of the operator like the front column, and there is a problem that both feet of the operator are exposed to the reaping unit.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention relates to a combine having a steering column having a body length standing upright at a substantially central portion of a front portion of a driver's cab and a round steering handle mounted on an upper surface of the steering column. A step plate is provided on each of the left and right sides of the steering column, and a cover body is provided to cover the front side of the step plate to prevent both feet of the operator from being exposed to the reaping portion.

Further, the left and right ends of the cover body are curved rearward, and the left edge of the cover body is joined to the front edge of the side column of the side column provided on the left side of the driver's cab. It is intended to prevent both feet of the user from being exposed to the reaping part.

Further, a step plate on the right side of the steering column, which is a side where the operator gets on and off, is horizontally stretched so that the operator can get on and off safely, while the left step plate on the steering column is inclined forward and upward. By stretching and preventing interference with the reaping section at the time of climbing, the body can be more effectively made compact.

In addition, a side mirror is mounted on the steering column, and a mirror mounting arm integrally extending rightward from the steering column is also used as a protection guard for an operator.

In addition, an indicator is provided on the front upper surface near the steering handle of the side column provided on the left side of the driver's cab to indicate the working state, and the indicator is arranged within the field of view of the worker at the time of working. It is intended to improve operability.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. Fig. 1 is an overall side view of the combine, Fig. 2
Is a plan view of the same, in which (1) is a track frame on which a pair of left and right traveling crawlers (2) are mounted, (3) is a chassis frame installed on the track frame (1),
(4) A threshing unit in which a feed chain (5) is stretched to the left and a handling drum (6) and a processing drum (7) are built in, (8).
Is a cutting unit provided with a cutting blade (9) and a culm transport mechanism (10), (11) is a hydraulic cylinder that moves the cutting unit (8) up and down through a cutting frame (12), and (13) is a straw chain. (14) A straw processing unit facing the end, (15) a grain tank for carrying the grains from the threshing unit (4) through a fryer (16), and (17) a tank for the tank (15). A discharge auger for carrying out grains outside the machine, (18) a driver's cab provided with a round steering handle (19), a driver's seat (20), and the like;
Reference numeral (21) denotes an engine provided below the driver's seat (20), which is configured to continuously cut husks and thresh.

Further, as shown in FIG. 3, a mission (22) for driving the traveling crawler (2) includes a pair of first
A straight HST (25), which comprises a hydraulic pump (23) and a first hydraulic motor (24) to form a hydraulic continuously variable transmission mechanism for traveling main speed, a pair of second hydraulic pumps (26) and A hydraulic HST (28) that forms a hydraulic hydraulic continuously variable transmission mechanism with a two-hydraulic motor (27), and a first and a second hydraulic pump on an output shaft (21a) of the engine (21). (23) Input shafts (29a) and (26) (29)
b) are connected by transmission belts (30a) (30b) to drive the hydraulic pumps (23) (26). The "HST" is a hydraulic-static transmission (hydro-static transmission).
This means that power is transmitted using hydraulic pressure. First, a hydraulic pump is driven by an engine, the generated pressure oil is guided to a hydraulic motor, and power is transmitted.
The speed is adjusted by changing the amount of oil using a variable displacement pump comprising a swash plate and a plunger.

An output shaft (31) of the first hydraulic motor (24) is provided with an auxiliary transmission mechanism (32) and a differential mechanism (3).
3) through the driving wheels (3) of the left and right traveling crawlers (2).
The differential mechanism (33) has a pair of left and right symmetric planetary gear mechanisms (35) and (35), and each planetary gear mechanism (35) has one sun gear (36).
, Three planetary gears (37) meshed on the outer periphery of the sun gear (36), and a ring gear (38) meshed with the planetary gears (37).

The planetary gear (37) is rotatably supported on a carrier (41) of a carrier shaft (40) on a coaxial line with a sun gear shaft (39), and sandwiches left and right sun gears (36) and (36). The left and right carriers (41) are arranged to face each other, and the ring gear (38) has internal teeth (38a) meshing with each planetary gear (37) and is arranged on the same axis as the sun gear shaft (39). The carrier shaft (4) is rotatably supported on the shaft (40).
0) is extended to form an axle to support the drive wheel (34).

The HST for straight traveling (25) controls forward / reverse rotation and rotation speed of the first hydraulic motor (24) by adjusting the angle of the rotary swash plate of the first hydraulic pump (23). The rotation output of the first hydraulic motor (24) is
Each gear (43) (44) from the transmission gear (42) of 1)
The sun gear (36) is configured to be transmitted to a center gear (46) fixed to the sun gear shaft (39) via the (45) and the auxiliary transmission mechanism (32) to rotate the sun gear (36). The sub-transmission mechanism (32) is provided with a sub-transmission shaft (47) having the gear (44) and a center gear (4) via the gear (45).
6) a parking brake shaft (4) having a gear (48) meshing therewith;
9), the auxiliary transmission shaft (47) and the brake shaft (49).
A pair of low speed gears (50) (51), medium speed gears (52) (53), and high speed gears (54) (48) are provided between the low speed gear (55) and the high speed slider (55). (56)
The low speed, the medium speed, and the high speed of the subtransmission are switched by the sliding operation of the sub speed. Note that there is neutrality between low and medium speeds and between medium and high speeds. The brake shaft (4
9) A parking brake (57) is provided, and a cutting PTO shaft (58) for transmitting a rotational force to the cutting unit (8) is connected to a sub-transmission shaft via gears (59) and (60) and a one-way clutch (61). (47) are connected, and the mowing part (8) is driven at the vehicle speed tuning speed.

As described above, the driving force from the first hydraulic motor (24) transmitted to the sun gear shaft (39) via the center gear (46) is applied to the left and right planetary gear mechanisms (35).
And to the left and right carrier shafts (40) via
The rotation transmitted to the left and right carrier shafts (40) is transmitted to the left and right drive wheels (34), respectively, to drive the left and right traveling crawlers (2).

Further, the turning HST (28) is controlled by changing the angle of the rotary swash plate of the second hydraulic pump (26).
The hydraulic motor (27) controls forward and reverse rotations and the number of rotations, and includes a brake shaft (63) having a steering output brake (62) and a clutch shaft (65) having a steering output clutch (64). The left and right input gears (66) (6) that always mesh with the external teeth (38b) of the left and right ring gears (38).
7), the output shaft (68) of the second hydraulic motor (27)
The brake shaft (63) and the steering output clutch (6)
4), the clutch shaft (65) is connected thereto, and the right input gear (6) is connected to the clutch shaft (65) via the forward rotation gear (69).
7), and the left input gear (6) is connected to the clutch shaft (65) via a forward gear (69) and a reverse gear (70).
6) are connected. Then, the sub-transmission slider (5
5) The brake (62) is turned on and the clutch (64) is turned off by the neutralization of (56), while the brake (62) is turned off and the clutch (64) is turned on at the time of output of a sub-shift other than the neutral. The motor (2) is connected to the external teeth (38b) of the right ring gear (38) via the forward gear (69).
7) The torque is transmitted, and the forward gear (69) and the reverse gear (70) are transmitted to the external teeth (38b) of the left ring gear (38).
When the second hydraulic motor (27) is rotated forward (reverse rotation), the left ring gear (38) is rotated reversely (forward rotation) and the right ring gear (38) is rotated at the same rotational speed in the left and right directions. ) Is rotated forward (reverse rotation).

The second hydraulic motor for turning (27)
When the first hydraulic motor (24) for straight traveling is driven in a state where the left and right ring gears (38) are stationary and fixed, the rotation output from the first hydraulic motor (24) is The right and left traveling crawlers (2) are transmitted to the sun gear (36) at the same rotation speed, and driven by the same rotation speed in the same left and right rotation directions via the planetary gear (37) and the carrier (41) of the left and right planetary gear mechanism (35). Then, the aircraft travels straight in the front-rear direction. On the other hand, when the first hydraulic motor (24) for straight traveling is stopped and the left and right sun gears (36) are stationary and the second hydraulic motor (27) for turning is driven to rotate forward and reverse, the left planetary gear is driven. The gear mechanism (35) rotates forward or backward, and the right planetary gear mechanism (35) rotates reversely or forward, driving the left and right traveling crawlers (2) in the reverse direction, and turning the body left or right. In addition, by driving the second hydraulic motor for turning (27) while driving the first hydraulic motor for straight traveling (24), the body turns right and left and the course is corrected. The turning radius is determined by the output rotation speed of the second hydraulic motor (27).

Further, as shown in FIG. 2, FIG. 4 to FIG. 13, a body-length steering column (71) is erected and fixed approximately at the center of the front portion of the cab (18). A round steering handle (19) is provided on the upper surface so as to be rotatable around the vertical axis, and a side column (72) is provided on the left side of the cab (18).
2) A transmission (22) is disposed below, and a main transmission lever (73), an auxiliary transmission lever (74), a reaping clutch lever (75), a threshing clutch lever (76) and the like are provided on the side column (72). . The steering column (71) is formed by molding and processing an aluminum alloy casting, and is formed into a box shape by being split into right and left parts and fastened with a plurality of bolts (77). As shown in FIGS. 2, 21, and 42, the steering column (71)
A side mirror (171) that reflects the rear left side of the fuselage is attached to the mirror, and a mirror mounting arm (172) is integrally extended from the steering column (71) to the right side of the mirror, and a side mirror (17) is provided at the tip of the arm (172) so as to be adjustable in angle.
1) is attached, and the arm (172) is also used as a protective guard for the worker.

A tilt base (78) is integrally formed on the upper part of the steering column (71).
To the tilt bracket (8) via the fulcrum bolt (79).
0) is rotatably supported, and the tilt bracket (80) is fixed by the tilt lever (81) so that the angle can be freely adjusted. A shaft case (8) is attached to the tilt bracket (80).
2) A shaft case (82) is extended above an upper cover (83) for fixing the lower part integrally and fixed to the upper surface of the column (71), and the upper handle shaft (84) is rotatable inside the shaft case (82). The steering handle (19) is fixed at the upper end of the upper handle shaft (84), and the handle (19) is moved and adjusted around the fulcrum bolt (79) by operating the tilt lever (81) to a fixed position. And the handle (19) mounting position is adjusted in the front-rear direction to be fixed at a position where the operator can easily operate.

Further, the upper end of the lower handle shaft (86) is connected to the lower end of the upper handle shaft (84) via a universal joint (85), and the lower handle shaft (86) is mounted on the upper part of the steering column (71). In addition to being rotatably supported, the upper end of the steering input shaft (87) is rotatably supported above the steering column (71), and the gear (88) of the lower handle shaft (86) and the steering input shaft (87). ) Is engaged with each other to connect the shafts (86) and (87), and the steering input shaft (87) is extended vertically at substantially the center of the inside of the steering column (71).

Further, the steering column (71)
A bearing portion (90) is integrally formed on the left side surface at substantially the middle in the vertical direction, and one end of the transmission input shaft (91) is rotatably supported by the bearing portion (90) via a bolt (92) in a cantilever manner. The transmission input shaft (91) is supported substantially horizontally in the left-right direction, and the lower end of the steering input shaft (87) is connected to the upper end of the input fulcrum shaft (94) via a universal joint (93). (94) The lower end is rotatably supported on the speed change input shaft (91). A steering input member (95) is fixed to the upper end side of the input fulcrum shaft (94), and a transmission input member (9) is provided between the upper surface of the transmission input shaft (91) and the lower surface of the steering input member (95).
6), a transmission input member (96) is rotatably mounted around the input fulcrum shaft (94), and the input members (96) are removably fixed to the transmission input member (96) by a linkage bolt (97). 95) and (96), and both ends of a pinch spring (98) provided on the speed change input shaft (91) are locked to the speed change input member (96), and the speed change input member (9) is locked.
6) is supported by the spring (98) at the straight traveling neutral position. Further, the input members (95) and (96) are rotated forward and reverse around a substantially vertical axis of the input shaft (87) against a spring (98) by forward and reverse rotation of the steering input shaft (87). By rotating the speed change input shaft (91) forward and reverse, the input fulcrum shaft (9
4) and the input members (95) and (96) are tilted in the front-rear direction, and the center line of the vertical steering input shaft (87) and the center line of the left and right horizontal shift input shaft (91) intersect at right angles. A universal joint (93) is attached to the intersection, and the input members (95) (9) are rotated around the center line of the steering input shaft (87) by a forward / reverse operation of the steering input shaft (87) of the steering handle (19).
6) is reversed.

Further, the steering column (71)
A left end of a main transmission shaft (99) that rotatably supports a main transmission shaft (99), which is a main transmission operation input portion from a side column (72), in a lower front portion of the main transmission shaft and extends substantially horizontally in the left-right direction. Is projected outward on the left side of the steering column (71), and a link (10) is connected to a middle shaft (100) which is a main transmission operation lateral transmission member provided below the side column (72).
1) The main transmission shaft (99) is connected to the main transmission shaft (99) via the rod (104) with the length adjustment turnbuckle (103), which is the main transmission operation longitudinal transmission member whose length can be adjusted. Further, a fulcrum plate (106) is rotatably mounted on a lever fulcrum shaft (105) inside the side column (72), and the base of the main speed change lever (73) is moved to the fulcrum plate (106) via a cylinder shaft (107). Attached to swing freely in the direction
The intermediate shaft (100) is connected to the fulcrum plate (106) via links (108) and (109), and the main speed change lever (73) is connected.
Is rotated forward and backward around the lever fulcrum shaft (105) to rotate the main transmission shaft (99) forward and reverse. In addition, the rod-type main transmission member (110) and the vertical link (1)
11) A main transmission shaft (99) is connected to the transmission input shaft (91) via (112), and the input member (95) is rotated by a forward / reverse operation of the main transmission shaft (99) of the main transmission lever (73).
(96) is tilted back and forth around the center line of the transmission input shaft (91).

Further, a cylindrical steering output shaft (113) is rotatably mounted on the main transmission shaft (99), and the link steering output member (114) is fixed to the steering output shaft (113). At the same time, the upper end of the rod-shaped steering connecting member (115) is connected to the steering input member (95) via a universal joint-type steering input connecting portion (116), and a ball joint type steering output connecting portion. The lower end of the steering coupling member (115) is connected to the steering output member (114) via (117) to constitute a steering mechanism (118) for changing the traveling course.

Further, a speed change output shaft (119) is rotatably supported inside the steering column (71) substantially in parallel with the steering output shaft (113) above the steering output shaft (113),
The link type shift output member (120) is connected to the shift output shaft (11).
9) and a rod-shaped speed change coupling member (12).
The upper end of 1) is connected to the speed change input member (96) via a universal joint type speed change input connection portion (122), and the speed change coupling member (1) is connected via a ball joint type speed change output connection portion (123).
21) is connected to the shift output member (120) at the lower end thereof,
A speed change mechanism (1) that changes the traveling speed and switches between forward and reverse
24).

Further, the inner speed change operation shaft (125) and the outer steering operation shaft (12) of the double shaft structure rotatable with respect to each other.
6) is rotatably mounted on a bearing (127) in the center of the left and right widths at the lower rear side of the steering column (71).
The variable speed output shaft (11) is connected via a ball joint shaft (128) and a variable speed link (129) (130) whose length is adjustable.
9), the upper end portion of the speed change operation shaft (125) is connected, and the steering output shaft (11) is connected via a ball-and-joint shaft (131) and steering links (132) and (133) whose length is adjustable.
The upper end of the steering operation shaft (126) is connected to 3).

Each of the operating shafts (125) (126)
Are set up on the bottom of the steering column (71) substantially vertically on the same axis, and the upper ends of the operation shafts (125) and (126) are extended inside the steering column (71), and the output shafts (113) ( 119) and each operating shaft (125) (12) below the bottom of the steering column (71).
6) The operating shaft (12) is provided on the lower surface side of the operator's cab (18) on the step board (134)
5) (126) The trunnion arm (136) is fixed to the first trunnion (135), which is the main speed change operation input portion of the straight-ahead HST (25), by extending the lower end side, and the steering column (71) And HST for straight ahead (2
5) The main speed change operation of the steering column (71) via the length adjustable rod (138) with the turnbuckle (137) and the link (139), which is the main speed change operation transmission member whose length can be adjusted between the steering column (71). A trunnion arm (136) is connected to the lower end of the speed change operation shaft (125), which is an output unit, and the swash plate angle of the first hydraulic pump (23) is adjusted by forward / reverse operation of the first trunnion (135). The control of the rotation speed of one hydraulic motor (24) and the switching between forward and reverse rotations are performed, and the stepless change of the traveling speed (vehicle speed) and the switching between forward and backward traveling are performed. A trunnion arm (1) is connected to a second trunnion (140), which is a steering operation input unit of the turning HST (28).
41), and a length-adjustable rod (143) with a turnbuckle (142), which is a steering operation transmission member whose length is adjustable between the steering column (71) and the turning HST (28); A trunnion arm (141) is connected to a lower end of a steering operation shaft (126), which is a steering operation output unit of the steering column (71), via a link (144), and a forward / reverse operation of a second trunnion (140) is performed. The swash plate angle of the second hydraulic pump (26) is adjusted to control the rotation speed of the second hydraulic motor (27) and to switch between forward and reverse rotations.
Stepless change of steering angle (turning radius) and switching of left and right turning directions are performed.

Further, the steering column (71)
An accelerator lever (145) is provided on the outer surface on the right side of the engine so as to be rotatable in the front-rear direction.
An accelerator wire (146) for connecting the engine (2) is extended from below along the inside of the front surface of the steering column (71), and the engine (2) is operated by an accelerator lever (145).
1) The number of revolutions is manually adjusted, a maintenance window (147) is opened on the rear surface of the steering column (71), and the maintenance window (147) is closed by a removable lid (148).

Further, as shown in FIGS. 14 and 15, a phase adjusting hole (14) through which the connecting bolt (97) is loosely inserted.
9) is set up in the steering input member (95), and a plurality of (three) screw holes (150) are provided on the same radiation centering on the core of the steering input shaft (87), and the radiation input The phase adjustment hole (149) is formed in a trapezoid whose bottom is the steering input shaft (87) side. When the steering handle (19) in the straight-ahead position is rotated left and right, the screw hole (1) is formed.
Until the linking bolt (97) fixed to (50) comes into contact with the edge of the phase adjusting hole (149), the steering input is held in a state where the speed change input member (96) is fixed at a fixed position by the sandwiching spring (98). The course is corrected by rotating only the member (95) and turning left and right while keeping the traveling speed substantially constant. When the link bolt (97) comes into contact with the edge of the phase adjustment hole (149), the steering handle (19) is further rotated in the same direction to connect the link bolt (97) to the steering input member. (95) and shift input member (96)
Both rotate against the spring (98) to correct the course while reducing the traveling speed, and the steering handle (19)
The turning radius determined by the operation and the deceleration amount of the traveling speed change in proportion to each other, and by returning the steering handle (19) to the straight traveling position, the shift input member (96) is neutralized by the pinch spring (98). It returns to its original position and automatically returns to its original running speed. Further, by replacing the linking bolt (97) with each screw hole (150), the phase adjusting hole (1) is changed.
49) The rotation angle of the steering input member (95) until the link bolt (97) abuts on the edge changes, and the steering handle (1)
9) When the deceleration start timing of the traveling speed by the operation can be adjusted and the steering handle (19) is supported straight,
The speed change input member (96) is fixed to the speed change input shaft (91) by the sandwiching spring (98), and prevents the speed change input member (96) from floating due to mechanical vibration or the like. The running speed is prevented from decelerating and changing.

Further, as shown in FIGS. 16 to 20, the gear (88) has a plurality of teeth (1) in an outer peripheral range of 270 degrees.
51) is formed, an outer peripheral range of 90 degrees is formed in an arc (152), the total rotation angle of the steering handle (19) is set to 270 degrees, and the angle of left steering rotation or right steering rotation is set to 135 degrees. The steering wheel (19) is set so that the operator can easily perform the rotation operation with one hand. Further, the sector gear (89) has a plurality of teeth (153) in an outer peripheral range of 130 degrees.
Is formed on the circular cam (154), and the teeth (151) of the gear (88) and the teeth (153) of the sector gear (89) are engaged with each other to form the gears (88) (8).
At the time of the maximum forward / reverse rotation of 9), the stoppers (155) at both ends of the arc (152) and the stoppers (156) at both ends of the arc cam (154) are brought into contact with each other to regulate the rotation of the steering handle (19). The steering input member (95) and the speed change input member (96) are rotated forward or backward in the range of 65 degrees around the center line of the steering input shaft (87), and the speed is shifted on a plane where each input member (95) rotates. The input shaft (91) and the main transmission member (1
10) A structure in which a space for arranging the upper end portion is secured, and the steering input connecting portion (116) is provided on the core line of the transmission input shaft (91), and the input connecting portions (116) on the same circumference.
(122) can be easily obtained at a 90-degree distance, and the structure can be made compact, and the design and assembly can be simplified.

Further, a straight notch (157) is formed at the center of the arc cam (154) of the sector gear (89), and a detent shaft (158) is rotatably supported on the upper wall of the steering column (71). Detent axis (15
8) A detent arm (159) is fixed to the lower end, a detent roller (161) is rotatably supported on the detent arm (159) via a roller shaft (160), and the detent roller (161) is attached to the arc cam (154). The detent roller (161) is removably engaged with the straight notch (157), and the steering handle (19) is supported at the straight position. Further, a detent lever (162) is fixed to the upper end side of the detent shaft (158), and one end of a neutral spring (163) wound around the detent shaft (158) is locked to the detent lever (162), and the steering column (162) is fixed. The other end of the neutral spring (163) is brought into contact with the receiving plate (164) of (71), and the detent roller (161) is attached to the circular cam (154) and the linear notch (157) by the neutral spring (1).
63). Further, a microswitch-type straight-ahead sensor (165) for electrically detecting the straight-ahead position of the steering handle (19) by switching on and off is attached to the detent lever (162).

When the main shift lever (73) is neutral, the forward (reverse) operation of the steering handle (19) causes each of the input members (9) to rotate around the center line of the steering input shaft (87).
5) (96) and the coupling members (115) (121) move on a conical trajectory, and the output members (114) (12)
0) and the state in which the output shafts (113) and (119) are stopped.

The forward (reverse) operation of tilting the main transmission lever (73) forward (rearward) causes the input members (95) and (96) to move forward (rearward) around the center line of the transmission input shaft (91). While maintaining the state in which the inclination and the steering input connection (116) are stopped at a fixed position, the speed change input connection (12)
2) is moved upward (downward) and the transmission output member (12
0) Upward (downward) swing of the transmission output shaft (119)
Is rotated forward (reverse rotation), and the first hydraulic motor (24) is rotated forward (reverse rotation) by switching the swash plate angle of the first hydraulic pump (23) of the straight-forward HST (25).
The right and left traveling crawlers (2) are driven forward (reverse) by the forward rotation (reverse rotation) of the output shaft (31). Further, the rotation speed of the output shaft (31) changes in proportion to the tilt angle of the main transmission lever (73), and the forward (reverse) speed of the traveling crawler (2) is continuously changed.

Further, when the main shift lever (73) is tilted forward (rearward) to perform forward (reverse) operation,
By rotating the steering handle (19) leftward (rightward), the steering input member (95) is tilted forward (rearward) around the center line of the transmission input shaft (91). 87) Forward rotation (reverse rotation) around the core line, the steering input connecting portion (116) moves downward (upward), and the steering output member (1
14), the steering output shaft (11
3) is rotated forward (reversely), and the second HST (28) for turning is rotated.
By switching the swash plate angle of the hydraulic pump (26), the second hydraulic motor (27) is rotated forward (reversely), and the second hydraulic motor (2) is rotated.
7) The forward rotation (reverse rotation) of the output shaft (68) causes the left traveling crawler (2) to decelerate (increase) and the right traveling crawler (2) to increase (decrease) to the left (to the right). ) And turn the aircraft to correct the course to the left (right). Also,
Simultaneously with the course correction operation, by turning the steering handle (19) to the left (rightward), the shift input member (96) is steered forward (rearward) around the center line of the shift input shaft (91). The input shaft (87) rotates forward (reverse) around the center line, the shift input connecting portion (122) moves downward (upward), and the shift output member (120) swings down (upward) to output the shift output shaft ( 119) is reversed (forward rotation), and the HST (2
5) The control to return to the neutral direction is performed to reduce the rotation speed of the output shaft (31) and reduce the traveling speed (vehicle speed). In this way, by turning the steering handle (19) left and right during the traveling movement, the turning radius (angle) for correcting the course and the deceleration of the traveling speed are proportional to the rotation angle of the steering handle (19). When the steering wheel (19) is rotated greatly, the speed difference between the left and right traveling crawlers (2) is increased to reduce the turning radius, and at the same time, the traveling speed is increased and the vehicle speed is decreased. At the same time, the movement of the turning input connecting portion (116) is made reverse to the rotation of the steering handle (19) between forward movement and reverse movement, and the rotation of the steering handle (19) in both forward and backward movements. The operation direction and the turning direction of the aircraft are made coincident, and the turning operation of the circular steering handle (19) for turning operation enables the correction of the course and the change of direction with the same driving feeling as a four-wheeled vehicle such as a tractor or a rice transplanter. Cormorant.

FIGS. 19 and 20 show the relationship between the turning angle of the steering handle (19) and the speed of the left-right traveling crawler (2) when the body turns left and right.
The greater the angle of cut of 9), the greater the speed difference between the left and right traveling crawlers (2), and the average center speed of the left and right traveling crawlers (2) is also the traveling speed (high speed / standard / low speed). It is decelerated according to. When the steering handle (19) in the straight traveling position is rotated leftward (rightward) by about 15 degrees,
A linking bolt (97) moves in the phase adjusting hole (149), and a shift input member (96) is moved by a holding spring (98).
Is maintained at the same position as the straight ahead, and the turning HST
(28) The second hydraulic pump (26) is turned leftward (rightward) by the steering output to rotate the second hydraulic motor (27) forward (reverse), and the uncut culm (crop) row is curved. Make a course correction to match. At this time, the amount of deceleration of the traveling crawler (2) inside the turning is substantially equal to the amount of acceleration of the traveling crawler (2) outside the turning, and the center speed of the machine is maintained at substantially the same speed as the straight traveling. Further, when the steering handle (19) is rotated by 15 degrees or more from the straight traveling position, the pinch spring (9) is rotated.
8), the speed change input member (96) decelerates in both left and right turns, reduces the speed change output of the first hydraulic pump (23) and the motor (24), and moves the left and right running crawlers (96). 2) is rotated in the same direction to move forward (or backward), and a brake turn operation of turning leftward (rightward) due to a difference in traveling speed of the left and right traveling crawlers (2) is performed. ) Make a course correction to return to the original row or move to the next row when you get out of the row. further,
When the steering handle (19) is rotated by about 135 degrees, the center speed of the fuselage is reduced to about one-fourth of that when traveling straight, and the traveling crawler (2) inside the turning is driven in reverse, and the traveling crawler (2) inside the turning is driven. ) Is performed, and the body turns around, and the body turns 180 degrees by shifting in the turning direction by the left and right widths of the left and right traveling crawlers (2), and the steering angle is changed from 0 to 135 degrees. Rotate the steering handle (19) in the left or right direction by turning the steering wheel (19) in the range, and along the row of uncut culms (crops) in the handle (19) rotation range of 15 degrees left and right centering on the straight traveling position The traveling alignment is corrected while maintaining the traveling speed at the time of straight traveling, and the body is turned on the field headland by turning the steering wheel (19) left and right by 135 degrees from the straight traveling position to move to the next work process. The spin turn operation to performed automatically decelerated to the first speed of about 4 minutes during straight.

Further, when the sub-shift is maintained at a standard speed (1.5 m / s) and the steering handle (19) is rotated 90 degrees, the main shift output is increased to 3 minutes by operating the main shift lever (73). Even if it is changed to one-third and one-third, only the turning speed (body center speed) is changed while the turning radius of the aircraft is kept substantially constant. Further, the first hydraulic pump (23) and the first hydraulic motor (24) are maintained in the straight traveling state within the setting range of the link bolt (97) and the phase adjusting hole (149) based on the straight traveling position, so that the crop row or the Prevents the running speed from changing non-uniformly even if the steering operation is performed along the ridge, etc., making it possible to correct the course during agricultural work while maintaining approximately the same running speed. And the appropriate steering operation can be performed by substantially matching the running operation of the vehicle. The sub-transmission lever (74) for switching the transmission reference value of the main transmission lever (73) changes the turning radius from a small diameter to a large diameter in proportion to the low-speed, standard and high-speed switching of the sub-transmission operation. 23) setting of the reduction ratio between the motor (24) and the traveling crawler (2) and the reduction ratio between the second hydraulic pump (26) and the motor (27) and the traveling crawler (2);
Alternatively, while ensuring the traveling driving force necessary for the small radius turning required for the spin turn operation, the turning radius is maintained substantially constant by operating the main shift lever (73) at the same sub-shift operation position. By changing the traveling speed at the time of turning, the driving operation can be performed according to the skill of the worker, and the mobility and the driving operability can be improved.

As described above, the differential mechanism (33) for transmitting the driving force of the engine (21) to the left and right traveling crawlers (2).
A straight HST (25) for continuously changing the driving speed of the left and right traveling crawler (2), and a turning HS for continuously changing the driving speed of the left and right traveling crawler (2).
In a combine provided with T (28), a steering input shaft (87) rotated by a steering operation tool (19) and a speed change input shaft (9) rotated by a speed change operation tool (73).
1), a transmission mechanism (124) for connecting the transmission input shaft (91) to the transmission member (25), and a steering mechanism (118) for connecting the steering input shaft (87) to the steering member (28). The steering mechanism (118) is configured to change the steering amount in proportion to the operation amount of the speed change mechanism (124). In short, the steering column (71) at the front of the cab (18).
The steering operation output unit (126) to the turning HST (28)
A main shift operation input unit (99) from the side column (72) on the left side of the cab (18) and the HST (25) for going straight ahead
A main speed change operation output unit (125) is provided to transmit the main speed change operation to the steering column (71) once instead of directly transmitting the main speed change operation to the straight running HST (25).
The steering operation amount is changed in proportion to the main shift operation amount input by the internal mechanism of the steering column (71), and the steering operation is performed by the turning HST.
(28), the steering amount is automatically increased by the high-speed running shift, and the steering amount is automatically reduced by the low-speed running shift, and the steering is operated by a certain amount of operation of the steering wheel (19). The turning radius of the left and right traveling crawlers (2) is maintained substantially constant irrespective of the speed, so that it is possible to easily change the traveling speed of the agricultural work and correct the course of the aircraft along the row of crops.

As shown in FIGS. 2 and 21 to 45, the body-length steering column (71) provided with the steering handle (19) is provided with a left and right extending left and right lower portions of the cab (18). The lower end portion is fixedly supported between the front ends of the chassis frames (3a) of the steering column (7a).
1) A step board (134) is installed on the upper surface of the driver's cab (18) on the rear side of the steering column (71) and on the upper surfaces of the driver's cabs (18) on the left and right sides of the steering column (71). , The front and rear length of the cab (18) is reduced, the overall length of the fuselage is reduced,
The aircraft is designed to be compact.

Further, the lateral width of the left step plate (134) of the steering column (71) is formed to be wider than the lateral width of the right step plate (134), and the space between the steering column (71) and the side column (72) is increased. The left column of the steering column (71) and the step plate (134) of the steering column
Overhanging the reaper (8) to the reaper (8)
In order to prevent the cover on the right side of the mowing part (8) from interfering with the left front part of the step board (134) when the is lifted to the highest position, the left front part of the step board (134) is inclined forward and upward. It is sloping. On the other hand, the step plate (134) on the right side of the steering column (71) on the operator's cab (18) side, which is the side on which the operator gets on and off, is stretched horizontally so that the operator can get on and off the vehicle safely.

The step board (134) includes front left and right step portions (134a) and (134b) on the left and right sides of the steering column (71), and a step body (134c) behind the steering column (71). The front left step portion (134a) with the front rising slope
And the horizontal front right step portion (134b) is always fixed to the chassis frame (3a), the horizontal step body (134c) is detachably attached to the chassis frame (3a), and the step body (134c) is removed. Thus, the structure on the lower surface side can be easily maintained.

A fuel tank (200) is provided on the lower surface side of the step plate (134), and the chassis frame (3) is provided.
a) a fuel tank (200) is fixedly supported, and between the steering column (71) and the fuel tank (200), the speed change operation shaft (12) is moved from the steering column (71).
5) and the steering shaft (126) are protruded, the rods (138) and (143) are stretched between the step plate (134) and the fuel tank (200), and the turnbuckle (137) (142) to the step body (134c)
And between the fuel tank (200)
The speed change operation shaft (125), the steering operation shaft (126), the rod (138) (143), and the turnbuckle (13)
7) Adhesion of mud and dust to (142)
00) to reduce factors that reduce the transmission accuracy of the main shift operation and the steering operation.

Further, between the step main body (134c) and the fuel tank (200), connection terminals (not shown) for wiring cables of various electric components of the combine and a fuse box (not shown) are provided. The fuel tank (200) prevents the attachment of mud and dust to these connection terminals and the fuse box, and the step body (134).
c) The configuration is such that maintenance of the connection terminals and the fuse box can be easily performed simply by removing them.

Further, the main transmission shaft (99) is projected from the steering column (71) into an extra space on the lower surface side of the front left step portion (134a) formed by raising the front portion of the step plate (134). The main transmission shaft (99) is connected to the step plate (1) while reducing the size of the body.
34) and the chassis frame (3a) to protect the main transmission shaft (99) from externally applied impacts and the like, and to reduce factors that reduce the transmission accuracy of the main transmission operation.

The side column (72) is a display for displaying the lever grooves of the main transmission lever (73), the auxiliary transmission lever (74), the reaping clutch lever (75) and the threshing clutch lever (76) and the working state. Liquid crystal panel (170)
Side panel (72a) provided with
2a) is fixedly supported on the upper surface side, and each lever (73)
(74) The support frame structure (201) of the side column (72) for mounting the lever fulcrum shaft and the like of (75) and (76)
And a side wall (20) extending to the right side of the side column (72).
2), the main shift lever (73) and the sub shift lever (74) are provided to form a main shift operation unit and a sub shift operation unit. The side column (72) is connected to the driver's cab (18). On the left side of this
The mission (2) in which each HST (25) (28) is mounted below 2), that is, below the side panel (72a).
2) is provided, and the support frame structure (201) is fixedly supported on the chassis frame (3a) which fixedly supports the steering column (71).

During the harvesting operation, the operator places the driver's seat (2
0), the operator adjusts the course, that is, corrects the course while looking at the tip of the weeding plate at the right end of the cutting unit (8). At this time, the operator who passes the front part or the front side of the steering handle (19), In order to confirm the work state by looking at the liquid crystal panel (170) of the side panel (72a) without greatly removing the eyes,
The liquid crystal panel (170) is arranged on the front upper surface near the steering handle (19) of the side column (72), that is, on the front part of the side panel (72a) to improve operability. .

An HST mounting seat for mounting a turning HST (28) mounted on a front portion of the upper surface of the mission (22) and a straight HST (25) mounted on a rear portion of the upper surface of the mission (22) to the mission (22). (204), a predetermined gap is provided between the turning HST (28) and the straight traveling HST (25), and each HST (25) (28) is placed inside the transmission belt (30a) (30b). Mission (22)
In addition to being integrally connected to the left side surface, these three members are also integrally connected, and the side column ( The support frame structure (201) of (72) is fixedly supported.

The side column (72) rising from the left side edge of the cab (18) has a steering column (7).
1) A rear side wall (202) covering the right side of the rear side column (72) and a front side wall (20) covering the right side of the left side column (72) of the steering column (71).
3), the rear side wall (202) is detachably attached to the support frame structure (201), and the front side wall (20) is formed.
3) is fixed to the support frame structure (201), the rear side wall (202) is removed, and the side column inner mechanism and each HST (25) (28) and the transmission are opened by opening the side wall rear part of the side column (72). The maintenance of (22) is configured to be easily performed from the driver's seat (20) side, and a front side wall (203) is further stretched on the left side of the left foot of the worker placed on the front left step portion (134a). A partition is provided between the reaping unit (8) and the left foot of the worker.

As described above, the main speed change lever (73) includes the lever fulcrum shaft (105) attached to the support frame structure (201) of the side column (72) and the lever fulcrum shaft (10).
A fulcrum plate (106), which is rotatably supported by 5) and the base of a main transmission lever (73) is swingably movable in the left-right direction via a cylindrical shaft (107); and links (109), (10).
8), the center shaft (1) connecting the fulcrum plate (106)
00), a link (102) (101) connecting the intermediate shaft (100) to the main transmission shaft (99), and a rod (104) with a length adjusting turnbuckle (103). The main transmission shaft (99) is connected to the main transmission shaft (99), and the main transmission operation of the main transmission lever (73) is transmitted and input to the main transmission shaft (99).
0) to the side column (72)
A ball-and-joint joint (206a) fixed to a support seat (205) integrally connected to the upper surface of the lower HST mounting seat (204) is made to bear, and the main transmission shaft output end of the intermediate shaft (100) is The ball joint (206b) fixed to the chassis frame (3a) on the lower surface side of the step plate (134) on the right side of the side column (72) is supported.
0) is properly supported in the lateral direction of the fuselage between the transmission (22) part having different vibrations and the chassis frame (3a),
The main transmission operation is transmitted to the main transmission shaft (99) of the steering column (71) on the right outside of the side column (72) via the middle shaft (100) and the rod (104). A friction plate (213) (214) for holding the fulcrum plate (106) is provided on the lever fulcrum shaft (105), and the main shift lever (73) is operated and positioned. The detent force is adjusted by loosening the nut (215) and the spring (21).
6) Adjust the force.

A sub-shift shifter shaft (207), which is a sub-shift operation input unit, is provided on the front side of the transmission (22). A lever fulcrum attached to the support frame structure (201) of the side column (72) is provided. A cylindrical shaft (209) at the base of the auxiliary transmission shaft (74) is rotatably fitted to the shaft (208), and the auxiliary transmission arm (210) is mounted on the front upper side of the transmission (22) from the cylindrical shaft (209). The sub-transmission arm (210) is extended by a substantially vertical rod (211) and a link (212), and is connected to the sub-transmission shifter shaft (207).
And the auxiliary transmission lever (74) is connected to the lever fulcrum shaft (2).
08) A speed change operation for swinging forward and backward is transmitted to the auxiliary speed change shifter shaft (207) on the front side of the transmission (22), and the auxiliary speed change shifter shaft (207) is rotated forward and reverse to switch the auxiliary speed change. It is configured as follows.

Further, the driver's cab (18) is provided with a parking brake pedal (217) and a parking brake lever (218), and the parking brake pedal (217) is connected between the steering column (71) and the side column (72). The parking brake lever (218) is provided at the front right side of the driver's cab (18). The parking brake lever (218) is provided at the front left side of the driver's cab (18). The pedal fulcrum shaft (219) is horizontally mounted on the chassis frame (3a), and the pedal fulcrum shaft (219) is rotatably mounted on the cylindrical shaft (220) fixedly supported on the chassis frame (3a). The base of the pedal arm (221) is engaged with the right outer pedal fulcrum shaft (219), and the pedal arm (221) is placed on the upper surface of the left end of the step plate (134).
1) is extended forward, and the parking brake pedal (217) is fixed to the tip of the pedal arm (221) above the front left step (134a). On the other hand, the lever fulcrum shaft (222) is rotatably mounted on the cylindrical shaft (223) fixedly supported on the front end of the right chassis frame (3a), and the parking brake lever (218) base is engaged with the lever fulcrum shaft (222). Let it be pivoted.

A notch (22) formed in the rear lower edge of the rear side wall (202) with the pedal fulcrum shaft (219).
4), an output arm (225), which is a parking brake operation output unit, is provided at the end of the pedal fulcrum shaft (219) inside the side column (72). 221), a lever fulcrum shaft (222) is connected to the output arm (225) via an operation wire (226) and a link (229), and a parking brake operation and a parking brake are performed by depressing a parking brake pedal (217). The parking brake operation by tilting operation of the lever (218) is performed by the output arm (22).
3).

A return spring (228) force is constantly applied to the output arm (223), and the output arm (223) is rotatably supported by a support shaft (229) attached to a support frame structure (201) of the side column (72). Checking operation plate (23
0), the output arm (225) is connected to the restraint operation plate (230) via a link or a connecting member (231) of a rod with a turnbuckle, and a left side of the transmission (22) serving as a parking brake operation input unit. The parking brake shifter (232) on the surface is connected with a check operation plate (230) via an operation wire (232a), and the parking brake pedal (2) is connected.
The parking brake shifter (2) is operated from the output arm (225) by performing the parking brake operation by stepping on the parking brake lever (218) and the parking brake operation by tilting the parking brake lever (218).
32) to operate the parking brake (57). In the figure, reference numeral (237) denotes an engagement rod for holding the parking brake pedal (217) at the depressed position.

When the parking brake (57) is applied,
A traction mechanism (233) for holding the main transmission lever (73) at the neutral position (when already at the neutral position) or returning and holding (when it is at a position other than the neutral position) is provided.
33) is a check roller (234) and a check roller (23).
4) A check plate (23) having a slot (235) for fitting therein.
6) and the above-mentioned restraint operation plate (230), the restraint roller (234) is mounted on the fulcrum plate (106) of the main speed change operation system, and the restraint plate (236) is incorporated in the parking brake operation system. Attach to (230) and parking brake (57)
When not applied, the large portion (235) of the slot (235)
a) A check roller (234) is positioned inside to allow the main shift operation, while a slot (23) is provided at the position of the check roller (234) when the main shift is neutral when the parking brake (57) is applied.
The movement of the restraining roller (234) from the neutral position or the movement of the restraining roller (234) from the neutral position after returning to the neutral position is controlled by moving the end of the small portion (235b) of 5). It is configured to be.

The parking brake operation is performed from the side column (72) to the parking brake (5) of the mission (22).
7) The operation wire (232a) to be transmitted to the portion is a straight H
It passes between the ST (25) and the turning HST (28) and is stretched between the restraint operation plate (230) and the parking brake shifter (232). A hole (238) is opened at a position corresponding to a gap between the HST (25) and the turning HST (28), and the operation wire (232a) is provided on the left side of the mission (22) from the inner side of the HST mounting seat (204). ) Through the transmission belt (30
a) The operation wire (232a) is guided to the parking brake shifter (232) along the left side of the mission (22) inside (30b).

Further, a coaxial tension arm fulcrum (241) of the tension rollers (239) (240) of the transmission belts (30a) (30b) is mounted on the HST mounting seat (204).

Further, the chassis frame (3) (3a), the fixed object welded and fixed to the chassis frame (3) (3a), and the side column (72) are mounted on the transmission (2).
2) is arranged outside the trajectory rotated about the axle (242) so that maintenance, assembly and development can be easily checked. In addition, mission (22)
The side column (72) connected to the support frame structure (201) of the side column (72) uses an elongated hole (243) to cope with positional deviation.

A front cover (250) is provided to cover the front side of the driver's cab (18), and the left and right sides of the upper portion of the cover (250) are connected to the left and right chassis frames (3a) via brackets (251) and (252). The lower end of the cover (250) is fixedly supported on the fuel tank (200) via left and right brackets (253), and a headlight (254) is mounted on the cover (250).

Further, a front left step portion (134a) and a front right step portion (134) of the step plate (134) are provided.
Step visor (2) which is a cover body covering the front side of b)
55), the lower surface of the step visor (255) is supported on the upper surface of the front cover (250), and the left and right sides of the lower part of the step visor (255) are joined together with the left and right sides of the upper part of the cover (250). The brackets (251) and (252) are bolted and fixed, and the left and right sides of the lower portion of the step visor (255) are fixed and supported on the front end of the chassis frame (3a).
4) and a step visor (255) is erected on the front side of the lower part of the steering column (71) to prevent both feet of the operator from being exposed to the reaping part (8) by the step visor (255). It is composed.

Further, the left and right ends of the front cover (250) are curved rearward, and the left and right ends of the step visor (255) are curved rearward along the front cover (250). The left side edge of the step visor (255) is joined to the front edge of the front side wall (203) of the side column (72), and the left side and the front side of the driver's cab (18) where the mowing part (8) is located. Is continuously covered by the side walls (202) and (203) of the side column (72) and the step visor (255) to more effectively prevent both feet of the operator from being exposed to the reaper (8). It is configured as follows.

[0058]

As is apparent from the above embodiment, the present invention is characterized in that a steering column (71) having a body length is erected at substantially the center of the front of the cab (18), and the steering column (7) is provided.
In the combine having a round steering handle (19) mounted on the upper surface of 1), step plates (134a) (134b) are provided on both left and right sides of the steering column (71), and the step plates (134a) (134b) By providing a cover body that covers the front side, the cover body (255) can prevent both feet of the operator from being exposed to the reaping unit (8).

The left and right ends of the cover body (255) are curved rearward, and the left side edge of the cover body (255) is provided on the left side of the cab (18).
By joining the front edge of the side wall (203) of (2), both feet of the operator can be more effectively prevented from being exposed to the reaping part (8).

Further, the step plate (134b) on the right side of the steering column (71) on the operator's entry / exit side is stretched horizontally, and the step plate (134a) on the left side of the steering column (71) is inclined forward and upward. It is installed on an inclined plane, so that workers can get on and off safely.
By preventing interference with the reaping unit (8) when ascending, the body can be more effectively made compact.

The side mirror (171) is mounted on the steering column (71), and the mirror mounting arm (172) integrally extending rightward from the steering column (71) can be used as a protection guard for the worker.

Further, an indicator (170) for displaying the working state is provided on the upper surface of the front part near the steering handle (19) of the side column (72) provided on the left side of the cab (18). By arranging the display (170) in the field of view of the worker, operability can be improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a combine.

FIG. 2 is an overall plan view of the combine.

FIG. 3 is an explanatory diagram of a mission drive system.

FIG. 4 is an explanatory perspective view of a traveling shift and steering operation unit.

FIG. 5 is an operation explanatory view of the same part.

FIG. 6 is a side view of a steering column.

FIG. 7 is an enlarged side view of the upper part.

FIG. 8 is an enlarged side view of the lower part.

FIG. 9 is a front view of a steering column.

FIG. 10 is an enlarged front view of the upper part.

FIG. 11 is an enlarged front view of the lower part.

FIG. 12 is an explanatory plan view of FIG. 4;

FIG. 13 is an enlarged view of FIG.

FIG. 14 is a cross-sectional view of a steering column.

15 is an exploded view of FIG.

FIG. 16 is a partial plan view of the upper part of the steering column.

FIG. 17 is a partial view of the same.

FIG. 18 is an operation explanatory view of FIG.

FIG. 19 is a diagram showing main speed change and steering handle operation.

FIG. 20 is a diagram showing sub-transmission and steering handle operation.

FIG. 21 is a right side view of the cab.

FIG. 22 is a left side view of the cab.

FIG. 23 is an enlarged side view of the upper part.

FIG. 24 is an enlarged side view of the lower part.

FIG. 25 is a side view of a side column.

FIG. 26 is a plan view of the same.

FIG. 27 is a front view of the same.

FIG. 28 is a side view of a main transmission operation system input unit.

FIG. 29 is a plan view of the same.

FIG. 30 is a front view of the same.

FIG. 31 is a plan view of a center shaft.

FIG. 32 is a side view of an output section of a main shift operation and steering operation system.

FIG. 33 is a plan view of the same.

FIG. 34 is a front view of the same.

FIG. 35 is a side view of an auxiliary speed change operation system.

FIG. 36 is a front view of the same.

FIG. 37 is a side view of a parking brake operation system.

FIG. 38 is a plan view of the same.

FIG. 39 is a front view of the same.

FIG. 40 is an enlarged side view of the restraint mechanism.

FIG. 41 is an enlarged side view of the upper part of the mission.

FIG. 42 is a front view of the cab.

FIG. 43 is a side view of the front of the cab.

FIG. 44 is a plan view of the same.

FIG. 45 is a front view of the same.

[Explanation of symbols]

 (2) Traveling crawler (3) (3a) Chassis frame (8) Mowing part (18) Cab (19) Steering handle (20) Driver's seat (21) Engine (22) Mission (25) HST for straight ahead (28) HST for turning (71) Steering column (72) Side column (170) Liquid crystal panel (display) (171) Side mirror (172) Mirror mounting arm (134) Step plate (134a) Front left step plate (134b) Front right step plate (134c) Step body (200) Fuel tank (217) Parking brake pedal (202) Rear wall (203) Front wall (250) Front cover (254) Headlight (255) Step visor (cover body) )

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nobuyuki Irie 428 Enami, Okayama City, Okayama Pref.Seirei Industry Co., Ltd. (72) Inventor Akinori Kakizaki 428 Enami, Okayama City, Okayama Pref. (72) Inventor Yukinori Kimura 428 Enami, Onami, Okayama Pref.Seirei Industry Co., Ltd. (72) Inventor Masashi Hachiya 428 Enami, Okayama City, Okayama Pref.Seirei Industry Co., Ltd. (72) Inventor Koichi Kawasaki 428 Enami, Onami, Okayama City, Okayama Prefecture (72) Inventor Masaaki Oda, 428 Enami, Okayama City, Okayama Prefecture Inside Sairei Industry Co., Ltd. (72) Inventor Mutsumi Machida Okayama, Okayama Prefecture No. 428, Enami, Ichinami, Sairei Kogyo Co., Ltd. (72) Inventor, Shinya Komatsu 428, Enami, Okayama City, Okayama Pref. 2B074 AA02 AB01 AC02 AD05 AE01 AF02 AG03 BA07 BA11 BA18 CA01 CE01 DA01 DA02 DA03 DA05 DA06 DB03 DE03 DF03 ED03 GE07 GH04 GH06 2B076 BC09 CD08 ED21

Claims (5)

[Claims] 1. A combine vehicle having a body-length steering column erected substantially at the center of a front portion of a driver's cab and a round steering handle mounted on an upper surface of the steering column. The combine is provided with a cover body that covers the front side of the step board. 2. The cover according to claim 1, wherein the left and right ends of the cover are curved rearward, and the left end of the cover is joined to the front edge of the side wall of a side column provided on the left side of the cab. Combine. 3. The combine as claimed in claim 1, wherein the right step plate of the steering column is stretched horizontally, and the left step plate of the steering column is stretched inclining forward. 4. The combine according to claim 1, wherein a side mirror is attached to the steering column. 5. A combine according to claim 1, further comprising an indicator for indicating a working state on an upper surface of a front portion near a steering handle of a side column provided on a left side of a cab.