JP2011194948A - Farm traveling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an operation check of a working machine in a braking state in a farm traveling vehicle having a mechanism automatically moving a main gear shift lever to the neutral position by pedaling a brake pedal.SOLUTION: When an auxiliary gear shift lever is put in a position (planting) other than the neutral position, a lock member 76 is turned through a wire 82, and a lock pin 77 is pinched between notches 76a, 75b, whereby the main gear shift lever 22 and a main gear shift operation member 75 are integrally turned. In this state, the main gear shift lever 22 is moved to the neutral position through flexible mechanisms 75c, 79 by pedaling the brake pedal. When the auxiliary gear shift lever is put in the neutral position, the link through the lock pin 77 is released, and the main gear shift lever and the brake pedal are allowed to be operated independently.

Description

  The present invention relates to an agricultural traveling vehicle such as a rice transplanter, an agricultural tractor, or a combine, and more particularly, a mechanism for automatically moving a forward or reverse main transmission lever to a neutral position by depressing a brake pedal for the power transmission system. The present invention relates to an agricultural traveling vehicle.

  In agricultural vehicles, when the brake pedal is depressed during traveling (forward, reverse), the main transmission lever is returned to the neutral position by the linkage mechanism of the main transmission lever and the brake pedal, and the main transmission is not connected to the main transmission lever. A structure in which a step transmission (for example, a hydrostatic continuously variable transmission (HST)) is in a neutral state and is braked has been proposed (Japanese Patent Nos. 4021790 and 2008-37317). . According to this conventional configuration, when the sub-shift (running, planting) is in a neutral state and the operation of the work machine is in a stationary state, if the brake is applied during the operation of the main shift, the linkage mechanism operates and the main shift is performed. Therefore, there is a risk that the operation of the work machine must be checked without applying the brakes, and the machine may move without being completely stationary.

Japanese Patent No. 4021790 JP 2008-37317 A

  In view of the above circumstances, the present invention relates to a power transmission system including a mechanism for automatically moving a forward or reverse main shift lever to a neutral position by depressing a brake pedal in an agricultural traveling vehicle. It is an object of the present invention to provide a mechanism that can operate the main speed change lever regardless of the operation of the brake while maintaining the stationary state of the brake, and thus can safely check the operation of the work machine in the stationary state.

According to the present invention, the traveling power in which the main transmission (35), the branching portion (36) branching to the work power transmission system (S), the auxiliary transmission (39), and the body stop brake (41) are sequentially arranged from the transmission upstream side. A transmission system (M) is provided, and the main transmission (35) is operated by the main transmission lever (22) including the forward side, the neutral position and the reverse side, and the auxiliary transmission (39) is operated by the auxiliary transmission lever ( 23) In the agricultural traveling vehicle which is operated by including the neutral position by 23) and operates the airframe stop brake (41) by the brake pedal (25),
A linkage mechanism that links the brake pedal (25) and the main transmission lever (22) so as to move the main transmission lever (22) to a neutral position in conjunction with the brake operation of the brake pedal (25). (25, 49, 50, 67, 70, 71, 72, 73, 75),
When in the neutral position of the auxiliary transmission lever (23), the linkage release mechanism (23, 82, 76) releases the linkage between the brake pedal (25) and the main transmission lever (22). 77)
It is provided with.

  Note that the reference numerals in parentheses are for referring to the drawings, and do not limit the configurations described in the claims.

  According to the first aspect of the present invention, when the sub-transmission lever is neutral and the linkage release mechanism is turned on to operate the main transmission lever, the power from the main transmission is transmitted to the work power transmission system via the branch portion. Since this state is maintained even if the brake is operated, the working power transmission system and the work are secured by applying the brakes to the main body of the agricultural traveling vehicle to ensure the stationary state. The machine can be checked safely.

1 is an overall side view of an agricultural traveling vehicle according to the present invention. 1 is an overall plan view of an agricultural traveling vehicle according to the present invention. The power transmission diagram of this agricultural traveling vehicle. The whole top view which shows arrangement | positioning of the transmission mechanism around the transmission case of this agricultural traveling vehicle, and a brake mechanism. The left view of FIG. The right view of FIG. The speed change mechanism and brake structure figure of this agricultural traveling vehicle. The brake operation interlocking figure of this agricultural traveling vehicle. The disassembled perspective view of the principal part (main transmission operation part) of a main transmission structure. The operation (locking state) of the main transmission lever. The operation (release of a locked state) of a main gearshift lever.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show the whole agricultural traveling vehicle to which the present invention is applied, FIGS. 3 to 9 show its partial structure, and FIGS. 10 and 11 show its operation. In the following description, the front part or the front part, the rear part or the rear part is defined according to the traveling direction of the agricultural traveling vehicle.

  As shown in FIG. 1 and FIG. 2, the agricultural traveling vehicle 1 includes six strips at the rear of a traveling machine body 5 including a pair of steerable left and right front wheels 2 and a pair of left and right unsteerable rear wheels 3. A seedling planting work machine 6 configured to a planting specification is connected to be movable up and down through a parallel quadruple link mechanism 7 operated by a hydraulic cylinder.

  A transmission case 10 (FIGS. 3 to 6) that pivotally supports the front wheel 2 is connected and fixed to the front part of the body frame 9 of the traveling body 5, and the rear wheel 3 is pivoted to the rear part of the body frame 9. The supported rear transmission case 11 is supported so as to be able to roll freely. An engine 16 (FIG. 3) covered with a bonnet 15 is mounted on a front body 13 including a front frame 12 (FIG. 5) extending forward from the mission case 10. Further, a steering handle 19, a driver seat 20, and a step 21 for steering the front wheels 2 are disposed in the boarding driver located behind the engine 16, and a main speed change lever is provided around the steering handle 19. 22, an auxiliary transmission lever 23, and an airframe stop pedal (brake pedal) 25 are arranged. Further, on the left and right sides of the front part of the machine body, there are provided spare seedling tables 26 for placing and accommodating spare seedlings in a plurality of stages.

  In addition, the planting work machine 6 cuts out seedlings one by one from the lower end of the seedling placing stand 29 and the seedling placing stand 29, which are placed on six seedlings and moved back and forth with a set stroke in the left and right direction, and put them on the field. Six sets of rotary planting devices 30 to be planted, a planting transmission shaft 31, a leveling device 32, a drive shaft 33, and the like are provided.

  FIG. 3 shows the power transmission structure of this agricultural traveling vehicle. On the side surface of the transmission case 10, a hydrostatic continuously variable transmission (hereinafter referred to as "HST") as an example of a main transmission for main transmission (including forward, neutral, and reverse) driven by a belt in conjunction with the engine 16 is provided. ”) 35 is connected, and its output is input (upstream) to the mission case 10 and branched into the traveling power transmission system M and the work power transmission system S. Power is transmitted from upstream to downstream.

  The power of the work power transmission system S is taken out from a work power take-out shaft (PTO shaft) 37 via a four-stage gear shifting inter-shaft transmission mechanism 36 with a one-way clutch function as a work power branching portion. To be transmitted to the planting machine 6.

  The power of the traveling power transmission system M is shifted into two stages of high and low by a slide gear type sub-transmission mechanism 39 and then branched again into the front wheel system and the rear wheel system. The power of the front wheel system is transmitted via the front wheel power shaft 40. Then, the power of the rear wheel system is transmitted to the rear transmission case 11 via the transmission shaft 42 and the vehicle body stop brake 41.

  On the other hand, the power of the rear wheel system transmitted to the rear transmission case 11 is transmitted to the left and right rear wheels 3 via a multi-plate side clutch 44 disposed on the rear wheel power shaft 43, and the power is Further, it is branched and interlocked with the drive shaft 33 of the leveling device 32 described above.

  Further, in FIG. 3, P is a hydraulic pump driven by the power of the engine 16, and the pressure oil is sent to a hydraulic cylinder that operates the link mechanism 7 of the seedling planting machine 6 described above.

  4 to 6 show the overall relationship between the speed change mechanism and the brake mechanism of the agricultural traveling vehicle. As shown in FIG. 4, the main transmission lever 22 is arranged on the left side with the handle shaft 19 a interposed therebetween, and the auxiliary transmission lever 23 and the brake pedal 25 are arranged on the right side. The auxiliary transmission lever 23 and the brake pedal 25 perform an input operation to the HST 35 and the mission case 10, and also operate in conjunction with each other.

  The main speed change lever 22 is set to continuously move in “forward speed”, “neutral”, and “reverse speed”, and is linked to the HST 35 via the transmission rod 46.

  The sub-transmission lever 23 is set to “travel”, “planting”, and “neutral” movement, and is linked to the sub-transmission mechanism 39 in the transmission case 10 via the transmission rod 47 corresponding to the setting.

  The brake pedal 25 is interlocked with the airframe stop brake 41 in the transmission case 10 via the related members (rod 49, brake shaft 50, brake operation rod 51). Specifically, the brake pedal 25 includes a tread 25a and an arm portion 25b that rotates about a fulcrum a. A rod 49 is fixed to one end of the arm portion 25b via a connecting point b and the other end is fixed to an end portion of the brake shaft 50. It is attached via an arm member 52 that rotates around the provided fulcrum c. A spring material 53 that pulls the rod 49 backward is disposed behind the arm material 52, and the brake pedal 25 is always returned to the original position. The brake operation rod 51 includes a main body 51a and a swing rod 51b pivotally attached to the lower end of the main body 51a. The brake operation rod 51 is attached via an arm member 55 fixed to the brake shaft 50. The rotational movement transmits the displacement of the swing rod 51b into the mission case 10 via the arm member 55 and the main body 51a.

  Further, as shown in FIGS. 4 to 6, an engine mount 56 for mounting the engine 16 is mounted and fixed on the front frame 12 of the front body 13. A driving belt 59 is stretched between the engine pulley 57 and the HST 35 placed on the engine mount 56.

  The transmission case 10 is integrally assembled with a vertical mating surface 10A, has a front axle 10B on the side, and its front part is attached to the front frame 12 via a front attachment member 60. The rear portion is attached to the body frame 9 via the rear attachment member 61.

  In this mounting structure, the front mounting member 60 is formed by folding a flat plate body into a U-shaped cross section, a bolt hole opened in the flange portion, and a bolt hole opened in the front frame 12 and the transmission case 10. The front part of the transmission case 10 is attached by tightening the mounting bolts 62 attached to these bolt holes. The rear mounting member 61 is also formed by folding a flat plate into a U-shaped cross section, and the bolt holes opened in the flange portion correspond to the bolt holes opened in the body frame 9 and the transmission case 10, and The rear part of the transmission case 10 is attached by tightening the attachment bolt 63 attached to the bolt hole.

  In the present mounting structure, both the front mounting member 60 and the rear mounting member 61 sandwich the transmission case 10 from its side surfaces with the flange portions. Further, the bolt holes of the transmission case 10 are penetrated in the lateral direction, and the mounting bolts 62 and 63 inserted through the bolt holes are made into one piece (through bolt) and integrated.

  According to the present mounting structure, the front and rear portions of the mission case 10 are sandwiched and stopped by the U-shaped flat plate mounting members 60 and 61, so that the mating surface 10A of the mission case 10 is prevented from opening.

  The linkage mechanism between the main transmission lever 22 and the brake pedal 25 will be described in more detail with reference to FIGS. The related members (rod 49, arm member 52, spring member 53, brake shaft 50, arm member 55, brake operation rod 51) of the brake pedal 25 are as described above. It is transmitted to the airframe stop brake 41 in the mission case 10 via the related member.

  On the other hand, another related member that is linked to the main transmission lever 25 side is disposed at the other end of the brake shaft 50. That is, a swinging arm member 66 is fixed to the other end portion of the brake shaft 50, and one end of a rod 67 reaching the main transmission lever 22 side is connected to the arm member 66 through a connecting point e, and the other end is connected. Is fixed to a rotating shaft 69 arranged horizontally and horizontally on the main transmission lever 22 side, and is connected to a swinging portion of a first arm member 70 swinging around a connecting point f. In addition, a second arm member 71 that is fixed to another position of the same rotating shaft 69 and swings around the connection point g is attached. Further, the second arm member 71 has a joint point g and has two swinging portions 71a and 71b arranged side by side. And the lower end part of the 1st linkage rod 72 and the 2nd linkage rod 73 is connected with rocking | fluctuation part 71a, 71b of the 2nd arm material 71, respectively, and the upper end part of the 1st and 2nd linkage rods 72 and 73 is mentioned later. The main transmission operating member 45 constituting a part of the main transmission operating section 45 is connected via an interchange mechanism.

  The accommodation mechanism includes two arc-shaped long holes 75c and 75c formed around the rotation shaft 22A that is the center of rotation of the main speed change operation member 75, and the first transmission operation member 75 is inserted into the long holes. And the pins 79, 79 attached to the upper ends of the second linkage rods 72, 73. When the brake pedal 25 is in a released state where the brake pedal 25 is not depressed, the operation of the speed change lever 22 in all speed ranges is performed. When the brake pedal 25 is depressed and the brake is activated, the main transmission lever 22 is linked to the neutral position regardless of the position.

  The series of brake pedals 25 and the linkage mechanism from the rod 49 pivotally attached to the pedal 25 to the first and second linkage rods 72 and 73 and the above-mentioned accommodation mechanism are the linkage between the brake pedal 25 and the main transmission lever 22. This constitutes the main part of the “linkage mechanism”. As a result (details will be described later), when the brake pedal 25 is depressed, the main shift operating portion 45 is operated by the retracting movement of the rod 67, and the main shift lever 22 is forcibly displaced.

  The structure of the main transmission operation part 45 of the main transmission lever 22 of this embodiment is demonstrated. As shown in FIG. 9, the main speed change operation unit 45 includes a main speed change lever 22, a main speed change operation member (also referred to as a detent plate) 75, and a lock member 76. A configuration is adopted in which the lock pins 77 are arranged so as to be rotatable and parallel to each other around the rotation shaft 22A, and orthogonally and straddling them.

  Here, the main transmission lever 22 is an assembly of a flat plate whose base portion 22B holds a spring member and a mold member to which the rotary shaft 22A is fixed, and is connected to the HST 35 via a transmission rod 46. The structure is not limited as long as the function is achieved. The main speed change operation member 75 is a plate-like body having a rotation center hole 75a, and a notch 75b is recessed in a predetermined shape on the upper side, and the long hole 75c forms two arcs with the rotation center hole 75a interposed therebetween. And a notch 75d is formed on the lower side. A mounting pin 79 is movably mounted in each elongated hole 75c, and the upper ends of the first and second linkage rods 72, 73 are connected to the mounting pin 73. The main speed change operation member 75 is rotatably supported by the rotation shaft 22A being inserted into the rotation center hole 75. Further, a spring member 80 is interposed between the base portion 22B of the main transmission lever 22 and the main transmission operation member 75, and urges the main transmission lever 22 in a direction (lateral direction) toward the main transmission operation member 75. .

  The lock member 76 has a plate-like body in which a notch step 76a is formed from the upper side to the rear side of the square, and the rotary shaft 22A is inserted through the boss portion 76b protruding from the side surface. It can be rotated around 22A. A spring member 81 is disposed between the lock member 76 and the main speed change operation member 75, and both members are urged so as to be in a locked state described later. Further, one end of the inner wire 82 a of the Bowden wire 82 is fixed to the side of the lock member 76 at a position away from the boss 76 b (rotation center) and on the side opposite to the spring member 81. The other end of the inner wire 82 is guided to the sub-transmission lever 23 (described later) and forms part of the “linkage release mechanism” employed in the present embodiment.

  The lock pin 77 is fixed orthogonally to the side surface of the base portion 22B of the main transmission lever 22, and is arranged in contact with the notch portion 75b of the main transmission operation member 75 and the step portion 76a of the lock member 76. .

  Further, a notch urging member 83 is brought into contact with the notch 75d of the main transmission operating member 75 from below with a predetermined urging force, and a constant load is applied to the main transmission operating member 75. That is, the notch urging member 83 includes a rotary shaft portion 83a, a spring plate portion 83b, and a roller 83c, and the spring plate portion 83b gives a predetermined pressing force to the roller 83c that abuts the notch 75d. In this embodiment, the height of the peak of the notch 75d is increased as going to the high speed side. As a result, the load applied to the main transmission operating member (detent) 75, which has been conventionally adopted, can be reduced, the lever operating load near the low speed can be reduced, sudden start can be avoided, and driving operation can be made safe. it can.

  10 and 11, the linkage mechanism of the lock member 76, the Bowden wire 82, and the auxiliary transmission lever 23 of the main transmission operation unit 45 will be described. This linkage mechanism is a part of the configuration of the “linkage release mechanism” employed in the present embodiment, and the lock member 76 is moved via the inner wire 82a. The unlocked state of the lock member 76 is realized. Specifically, on the main transmission operation unit 45 side, the end of the inner wire 82a of the Bowden wire 82 is fixed to the lock member 76 as described above (FIG. 9), and the outer wire 82b of the Bowden wire 82 is locked. It is fixed to an attachment member 89 fixed to the main transmission operating member 75 adjacent to the member 76. Thus, when the main speed change operation member 75 and the lock member 76 are integrally rotated, there is no change in the length of the Bowden wire 82, and the auxiliary speed change lever connected to the other end of the Bowden wire 82. 23 is not affected. On the auxiliary transmission lever 23 side, the inner wire 82 a of the other end of the Bowden wire 82 is fixed to the base of the auxiliary transmission lever 23 via a spring body 90. Even at the other end of the Bowden wire 82, the outer wire 82b is fixed to a mounting portion 91 fixed to the machine body side, and the operation of the inner wire 82 is stabilized. The stroke of pushing and pulling the inner wire 82 is determined by the distance between the fastening point at the other end of the inner wire 82 and the fulcrum h of the auxiliary transmission lever 23.

  The “link release mechanism” employed in the present embodiment includes a main transmission operation member 75, a lock member 76, and a lock pin 77 that have already been described, and includes a series of connections from the lock member 76 to the auxiliary transmission lever 23 via the Bowden wire 82. Consists of a linkage mechanism. As is clear from the above description, the “linkage release mechanism” has a multi-function of a lock function, a lock state release function, and a lock state return function.

  The operation of the agricultural traveling vehicle 1 provided with the “linkage mechanism” and the “linkage release mechanism” between the brake pedal and the main shift lever of the present embodiment configured as described above will be described with reference to FIGS. 10, 11, and 8. I will explain.

  FIG. 10 shows a state in which the main transmission lever 22 is set to the neutral “N”, the auxiliary transmission lever 23 is operated to be planted “planting” (low speed stage), and the brake pedal 25 is not depressed. When the main transmission lever 22 is operated, the HST 35 is actuated via the transmission rod 46, and the transmission rod 47 is set to a predetermined forward gear ratio or reverse gear ratio corresponding to the operation position of the main transmission lever and linked to the auxiliary transmission lever 23. The low speed is set to the subtransmission mechanism 39 via this, the main agricultural traveling vehicle 1 travels at a relatively low speed, and the planting operation is performed along with the driving of the work implement 6.

  At this time, in the planting “planting” position state of the sub-transmission lever 23, the inner wire 82a has a pulling action, and the lock member 76 of the main transmission operating portion 45 is rotated clockwise about the rotary shaft 22A via the inner wire 82a. The lock pin 77 is pushed by the notch step 76a, and the lock member 76 is locked, in which the main transmission lever 22 and the main transmission operation member 75 are rotated together.

  That is, at the “planting” position of the auxiliary transmission lever 23, the lock pin 77 is sandwiched between the notch step portion 76 a of the lock member 76 and the notch portion 75 b of the main transmission operation member 75, and the lock pin 77 is interposed therebetween. The main speed change operation member 75 and the main speed change lever 22 are in a locked state in which the main speed change lever 22 rotates together, and the main speed change lever 22 and the main speed change operation member 75 maintain a linked relationship. At this time, since the inner wire 82a is fixed to the lock member 76 and the outer wire 82b is fixed to the main transmission operation member 75 on the main transmission side of the Bowden wire 82, the lock member 76 and the main transmission operation member 75 are integrated. In the state of being rotated, there is no relative displacement between the inner wire 82a and the outer wire 82b, and the auxiliary transmission lever 23 is not affected. When the auxiliary transmission lever 23 is put in the “travel” position, the spring body 90 permits the pulling action of the inner wire 82a and maintains the locked state.

  When the main transmission lever 22 is moved to the forward “F”, the main traveling lever 1 and the main transmission operation member 75 are linked with each other in the main transmission operation section 45, and the agricultural traveling vehicle 1 performs a predetermined normal operation. That is, forward movement is instructed to the HST 35 via the transmission rod 46 interlocked with the main transmission lever 22, and low speed is instructed to the auxiliary transmission mechanism 39 via the transmission rod 47 interlocked with the auxiliary transmission lever 23. As a result, the agricultural traveling vehicle 1 performs a seedling planting operation while moving forward at a low speed. At this time, as shown in FIG. 8, in the main speed change operation member 75, the mounting pin 79 at the upper end of the first linkage rod 72 guided from below the main speed change operation member 75 is relative to the rear long hole 75c. The attachment pin 79 at the upper end of the second linkage rod 73 moves downward relative to the rear long hole 75c. In other words, the operation of the main transmission lever 22 is absorbed by the accommodation mechanism and does not affect the brake pedal 25.

  When the brake pedal 25 is depressed in this state (“advance” and “planting”), the brake is actuated via the linkage mechanism from the brake pedal 25 to the airframe stop brake 41 of the mission case 10, and the brake pedal 25 A series of linkage mechanisms that reach the speed change operation section 45 are operated to operate the main speed change operation member 75 of the main speed change operation section 45.

  Specifically, as shown in FIG. 8, the rod 49 is pulled forward on the brake pedal 25 side, and the rod 67 reaching the main transmission operation unit 45 side via the brake shaft 50 is pulled rearward, so that the main transmission operation unit The first arm member 70 on the 45 side is rotated clockwise about the rotation shaft 69. As a result, the second arm member 71 also rotates clockwise about the rotation shaft 69, and the two swinging portions 71 a and 71 b of the second arm member 71 grip the first and second linkage rods 72 and 73. It goes down downward (two-dot chain line display in FIG. 8). One of the first linkage rods 72 is lowered, but stops in the middle of the long hole 75c, and the other second linkage rod 73 is in contact with the lower end of the long hole 75c to give a downward pressing force. Thus, the main speed change operation member 75 rotates to the neutral position in the clockwise direction around the rotation shaft 22A. At this time, the main speed change lever 22 and the main speed change operation member 75 are linked by the locked state of the lock member 76, so that the main speed change lever 22 is similarly rotated clockwise and led to the neutral position. Thereby, the HST 35 becomes neutral.

  This operation is the same even when the main speed change lever 22 is in reverse, and depending on the degree of depression of the brake pedal 25, it stops in the middle of reaching the neutral position of the main speed change lever 22 and includes maintaining a low speed. . As the brake is turned on and the HST 35 is neutral, the main clutch is not required in this embodiment.

  As shown in FIG. 11 (shown by a solid line), the sub-shift lever 23 is operated from “planting” to neutral “N”. As a result, the inner wire 82a is loosened, and the lock member 76 is rotated counterclockwise around the rotation shaft 22A by the pulling action of the spring member 80 in the main transmission operating portion 45, and the notch step portion 76a is locked to the lock pin. The main speed change operation member 75 and the main speed change lever 22 which are in the locked state by the lock pin 77 are disconnected from the main speed change lever 22. That is, the locked state is released. The main transmission operating member 75 and the main transmission lever 22 are disconnected. As a result, the HST 35 can be shifted by freely operating the main transmission lever 22 from the neutral “N” position to the forward “F” side, and the brake pedal 25 affects the main transmission operation lever 22. The airframe stop brake 41 can be operated without any operation.

  In this state, the main transmission lever 22 is operated from the neutral “N” position to the forward “F” side (indicated by a two-dot chain line in FIG. 11). That is, forward movement is instructed to the HST 35 via the transmission rod 46 interlocked with the main transmission lever 22, and neutral is instructed to the auxiliary transmission mechanism 39 via the transmission rod 47 interlocked with the auxiliary transmission lever 23.

  Thereby, in the transmission case 10 of the agricultural traveling vehicle 1, the rotation of the engine 16 is transmitted via the HST 35, and the transmission to the traveling power transmission system M is blocked by the auxiliary transmission mechanism 39 maintaining neutrality. However, the power of the work transmission system S is transmitted from the inter-strain transmission mechanism 36 which is a branch portion, is taken out from the work power take-out shaft 37, and is transmitted to the planting machine 6 through the transmission shaft 31.

  Accordingly, in the agricultural traveling vehicle 1, only the planting work machine 6 moves in a state where the traveling of the machine body is stopped. Needless to say, this operation is possible even when the brake pedal 25 is depressed and the airframe stop (parking) brake 41 is applied. That is, when the brake pedal 25 is stepped on, the stepping action causes the main transmission operation member 75 to be operated by a series of linkage mechanisms from the pedal 25 to the main transmission operation unit 45. Since the linkage is disconnected, there is no influence on the main transmission lever 22. Thereby, in a state where the traveling machine body 5 is reliably stopped by the machine body stop brake 41, the work machine 6 can be driven to perform maintenance.

  This operation is performed in the same manner as described above even when the main transmission lever 22 is operated backward, and performs the same operation.

  In the present embodiment, application to a rice planting machine as an example of an agricultural traveling vehicle is shown, but application to an agricultural tractor and a combine is not excluded.

  Moreover, it is not limited to the linkage cancellation | release mechanism specifically disclosed by this embodiment, The aspect which provides the operation tool which cancels | releases interlocking | linkage with a main transmission lever and a brake pedal can also be taken.

1 Agricultural traveling vehicle 22 Main transmission lever 23 Sub transmission lever 25 Brake pedal 35 Main transmission (HST)
36 Branching part 39 Subtransmission 41 Brake (airframe stop brake)
25, 49, 50, 67, 70, 71, 72, 73, 75 Linkage mechanism 23, 82, 76, 77 Linkage release mechanism

Claims (1)

A traveling power transmission system in which a main transmission, a branching portion branching to a work power transmission system, a sub-transmission device, and an airframe stop brake are sequentially arranged from the transmission upstream side is provided. In the agricultural traveling vehicle, which operates including the reverse side, operates the auxiliary transmission device including the neutral position by the auxiliary transmission lever, and operates the airframe stop brake by the brake pedal.
A linkage mechanism that links the brake pedal and the main shift lever so as to move the main shift lever to a neutral position in conjunction with the brake operation of the brake pedal;
A linkage release mechanism for releasing the linkage between the brake pedal and the main transmission lever when the auxiliary transmission lever is in a neutral position, interposed in the linkage mechanism;
An agricultural traveling vehicle comprising:

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