CN111418314B

CN111418314B - Working machine

Info

Publication number: CN111418314B
Application number: CN202010253657.4A
Authority: CN
Inventors: 大西哲平; 岸冈雄介; 儿岛祥之; 谷口大辅
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2014-05-27
Filing date: 2015-03-31
Publication date: 2023-06-16
Anticipated expiration: 2035-03-31
Also published as: CN105309094A; JP2015223110A; CN105309094B; CN116171697A; CN111418314A

Abstract

The invention provides a working machine capable of preventing muddy water from entering a joint housing and simplifying grease injection operation. A universal joint (120) is provided in the middle of a power transmission shaft (74), and a joint housing (121) for covering the universal joint (120) is provided, wherein a grease nipple (123) of the universal joint (120) capable of injecting grease into the housing is mounted in a state that the injection port of the grease nipple is exposed to the outside of the joint housing (121).

Description

Working machine

This application is a divisional application of the following patent applications:

application number: 201510148689.7

Filing date: 2015, 03 and 31 days

The invention name is as follows: working machine

Technical Field

The present invention relates to a working machine including a traveling machine body movable in a field and a working device such as a planting series working device for planting seedlings or rice seeds on the ground, or the working machine being attachable thereto.

The planting-series working device according to the present invention is a device for planting or sowing seedlings of plants, such as a seedling planting device or a sowing device, and the planting-series working machine is a working machine having the planting-series working device.

Background

As described above, examples of the working machine having a working device or configured to be attachable include the structures described in [1] to [6] below.

[1] Is constructed as follows: a universal joint is provided in the middle of a power transmission system on a traveling machine body, a housing is provided to cover the universal joint, and a grease nipple is provided to inject grease into the universal joint (see patent document 1).

[2] Is constructed as follows: the state of the brake pedal being depressed is detected by calculating the depression angle using a potentiometer (see patent document 2)

[3] Is constructed as follows: a drive shaft for transmitting power from a transmission case to a rear wheel drive case and a drive shaft for transmitting power to a drive case of a work equipment system on the rear side of a machine body are extended, and power is transmitted from the drive case of the work equipment system to the seedling planting device side and the fertilizer application device side (see patent document 3).

[4] Is constructed as follows: a bevel gear engaged with a bevel gear on the upstream side of the transmission is provided in the transmission case, and power is transmitted to the power output shaft, and the power output shaft is pulled out from the bevel gear for maintenance (see patent document 4).

[5] Is constructed as follows: a clutch operation mechanism is provided which is operable from the outside of the transmission by pushing and pulling an operation shaft to operate a working clutch provided in the transmission (see patent document 5).

[6] Is constructed as follows: the transmission includes a plurality of sub-transmission mechanisms, and a sub-transmission lever for operating one of the sub-transmission mechanisms is projected from an opening provided in a lower portion of the control box toward a driver's seat (see patent document 6)

Patent document 1: japanese patent application laid-open No. 2012-211609 (refer to paragraph number "0027", FIGS. 3 and 5)

Patent document 2: japanese patent laid-open No. 11-187721 (refer to paragraph number "0031", FIG. 4)

Patent document 3: japanese patent laid-open No. 08-252009 (refer to paragraph numbers "0011", "0017", "0018", FIG. 1)

Patent document 4: japanese patent application laid-open No. 2014-70653 (refer to paragraph number "0038", FIGS. 4 and 6)

Patent document 5: japanese patent application laid-open No. 2014-70653 (refer to paragraph number "0038", FIGS. 4 and 6)

Patent document 6: japanese patent application laid-open No. 2014-70653 (refer to paragraph number "0045", FIGS. 1 and 3)

Problems to be solved by the invention

In the working machine described in patent document 1, there is disclosed a structure in which: the universal joint covered by the joint housing is provided with a grease nipple, and the joint housing is formed with an opening for easily inserting a nozzle of a grease gun into the grease nipple. However, in this structure, grease can be injected from the outside without removing the housing, but there is a problem that muddy water or the like may enter from the opening, and it is necessary to find the position of the grease nipple inside the joint to perform grease injection, and there is room for improvement in operability.

The working machine described in patent document 2 has a structure in which a pedal is depressed by a potentiometer, and has a problem in terms of cost.

In the working machine described in patent document 3, since the seedling planting device and the fertilizer application device are driven by the power from the transmission case in common, there is a possibility that the fertilizer application amount changes with respect to the traveling speed when the plant spacing is changed, and this has a problem that improvement is required.

The working machine described in patent document 4 is useful in that it is configured to be able to easily perform maintenance work by pulling out the power output shaft from the bevel gear, but there is room for improvement in that the procedure for removing the bevel gear from a desired attachment position and again performing assembly is easy to become complicated by pulling out the power output shaft.

In the working machine described in patent document 5, a crank-shaped member for pushing and pulling an operation shaft is used, but since it is a die cast, it is easy to increase the cost, and there is a problem that cracking occurs, and there is room for improvement in this respect.

In the working machine described in patent document 6, the structure is as follows: the auxiliary lever is useful in that it is easily disposed in a portion of the machine body where there is a margin by projecting the auxiliary lever from an opening provided in the lower portion of the control box toward the driver's seat, but when the grip portion is made as high as possible and the projecting length of the auxiliary lever from the upper surface of the transmission is made long, deformation occurs during the operation of the auxiliary transmission, and there is a possibility that it is difficult to perform work when the seal replacement or the like is performed on the projecting portion projecting from the transmission.

Disclosure of Invention

The present invention can inhibit muddy water from entering the joint housing and simplify the grease injecting operation.

In addition, in the present invention, the depressed state of the brake pedal can be detected with a simple structure and at low cost.

In addition, in the present invention, even if the plant spacing is changed on the seedling planting device side, the increase or decrease of the fertilizer supply amount on the fertilizer applying device side is not affected.

In addition, in the present invention, when the power output shaft is pulled out from the bevel gear and maintenance work is performed, the position of the bevel gear after shaft pulling-out is maintained in a state where no large change occurs, and assembly such as reinsertion of the shaft can be simplified.

In the present invention, the cost of the member for pushing and pulling the operation shaft is reduced by sheet metal working or the like.

In addition, in the present invention, maintenance work of the auxiliary gear lever can be simplified, and durability can be improved.

Means for solving the problems

[ solution means 1]

In order to solve the above-described problems, according to the working machine of the present invention, a transmission case is fixed to a machine body frame of a traveling machine body, a rear axle case is vertically swingable by a link mechanism whose front end is pivotally supported by the machine body frame side, and is connected to the machine body frame by a cross bar, a universal joint is provided in a middle portion of a power transmission shaft, a joint housing covering the universal joint is provided, the joint housing is formed of a flexible tube having a peak portion and a valley portion formed in a tubular peripheral portion in a bellows shape, a flat portion having no peak portion and valley portion is provided on a part of the flexible tube, a grease nipple penetrating the flexible tube from inside to outside is fixed, the grease nipple of the universal joint which can be injected into the housing is attached to the flat portion in a state in which the grease nipple is exposed to an outside of the joint housing, the flat portion is formed in a cylindrical shape throughout the entire peripheral portion of the flexible tube, and the universal joint and the housing are provided between an output shaft of the transmission case and the rear axle, and an input shaft of the transmission case and a portion connecting the input shaft and the input shaft to the transmission shaft.

[ operation and Effect of the invention of means 1 ]

According to the structure of the present invention of the above-mentioned solution 1, since the joint housing is provided to reliably prevent muddy water or the like from entering the housing inner space where the universal joint exists, and the grease nipple is attached in a state in which its injection port is exposed to the outside of the joint housing, there is an advantage that: grease is easily injected from the outside opposite to the required portion of the inner universal joint.

Further, since the joint cover is constituted by a flexible tube formed in a corrugated shape, there is an advantage that: the grease fitting is easily adapted to buckling deformation of a universal joint portion, and is easily attached to a joint housing in a state where tightness of an attachment portion is ensured by having a flat portion.

Further, the flat portion is formed in a cylindrical shape over the entire circumference of the flexible tube, which has an advantage of easy formation of the flat portion.

Thus, there are advantages in that: a structure suitable for a shaft transmission system at a connection portion with a transmission shaft connecting an output shaft and an input shaft of a rear axle box is obtained between a transmission case and the rear axle box supported on a body frame by a link mechanism, a cross bar, and the like.

[ means for solving the problems 2]

In order to solve the above-described problems, another aspect of the present invention is to provide a universal joint in a middle of a power transmission shaft, and to provide a joint housing covering the universal joint, wherein the joint housing is formed of a flexible tube having a peak and a valley in a cylindrical peripheral portion and formed in a bellows shape, a flat portion without the peak and the valley for fixing a grease nipple in a state of penetrating the flexible tube inside and outside is provided in a part of the flexible tube, the grease nipple of the universal joint capable of injecting grease into the housing is attached to the flat portion in a state that an injection port of the grease nipple is exposed to an outside of the joint housing, the flat portion is formed in a cylindrical shape over an entire circumference of the flexible tube, and the universal joint and the joint housing are provided at a connection portion connected to a transmission shaft connecting the output shaft and an input shaft of a rear axle housing.

[ action and Effect of the invention of means 2]

According to the structure of the present invention of the above-mentioned solution 2, since the joint housing is provided to reliably prevent muddy water or the like from entering the housing inner space where the universal joint exists, and the grease nipple is attached in a state in which its injection port is exposed to the outside of the joint housing, there is an advantage that: grease is easily injected from the outside opposite to the required portion of the inner universal joint.

Further, the flat portion is formed in a cylindrical shape over the entire circumference of the flexible tube, and thus has an advantage of easy formation of the flat portion.

Thus, there are advantages in that: between the gearbox and the rear axle box, a construction of the axle transmission system is obtained which is adapted to the connection point with the drive axle connecting its output shaft and input shaft.

[ means for solving the problems 3]

In order to solve the above-described problems, another aspect of the present invention is to provide a universal joint in a middle of a power transmission shaft, and to provide a joint housing covering the universal joint, wherein the joint housing is formed of a flexible tube having a peak and a valley in a cylindrical peripheral portion and formed in a corrugated shape, a flat portion having no peak and no valley is provided on a part of the flexible tube, the flat portion being for fixing a grease nipple penetrating the flexible tube in an inner-outer direction, the grease nipple of the universal joint capable of injecting grease into the housing is attached to the flat portion in a state that an inlet of the grease nipple is exposed to an outside of the joint housing, the flat portion is formed in a cylindrical shape throughout the entire periphery of the flexible tube, and the universal joint and the joint housing are provided in a shaft transmission system provided between a transmission case provided in a traveling machine body and a rear axle housing.

[ action and Effect of the invention of means 3 ]

According to the structure of the present invention in the above-described solution 3, since the joint housing is provided to reliably prevent muddy water or the like from entering the housing inner space where the universal joint exists, and the grease nipple is attached in a state in which the injection port thereof is exposed to the outside of the joint housing, there is an advantage that: grease is easily injected from the outside opposite to the required portion of the inner universal joint.

Further, since the flat portion is formed in a cylindrical shape over the entire circumference of the flexible tube, there is an advantage in that the flat portion can be easily formed.

Thus, there are advantages in that: a configuration of the axle transmission system adapted to be arranged between the gearbox and the rear axle box is obtained.

[ means for solving the problems 4]

In order to solve the above-described problems, another aspect of the present invention is to provide a universal joint in a middle of a power transmission shaft, and to provide a joint housing covering the universal joint, wherein the joint housing is formed of a flexible tube having a peak and a valley in a cylindrical peripheral portion and formed in a corrugated shape, a flat portion having no peak and no valley is provided on a part of the flexible tube, the flat portion being configured to fix a grease nipple penetrating the flexible tube in an inner-outer direction, and the grease nipple of the universal joint capable of injecting grease into the housing is attached to the flat portion in a state that an inlet of the grease nipple is exposed to an outside of the joint housing, and the flat portion is formed in a cylindrical shape over an entire periphery of the flexible tube.

[ action and Effect of the invention of means 4 ]

According to the structure of the present invention of the above-mentioned solution means 4, since the joint housing is provided to reliably prevent muddy water or the like from entering the housing inner space where the universal joint exists, and the grease nipple is attached in a state in which its injection port is exposed to the outside of the joint housing, there is an advantage that: grease is easily injected from the outside opposite to the required portion of the inner universal joint.

[ means for solving the problems 5]

In order to solve the above-described problems, another aspect of the present invention is to provide a universal joint in a middle of a power transmission shaft, and to provide a joint housing covering the universal joint, wherein the joint housing is formed of a flexible tube having a peak and a valley in a cylindrical peripheral portion and formed in a corrugated shape, a flat portion having no peak and no valley is provided on a part of the flexible tube, the flat portion being for fixing a grease nipple penetrating the flexible tube in an inside-outside manner, and the grease nipple of the universal joint capable of injecting grease into the housing is attached to the flat portion in a state that an inlet of the grease nipple is exposed to an outside of the joint housing.

[ action and Effect of the invention of means 5 ]

According to the structure of the present invention in the above-described solution means 5, since the joint housing is provided to reliably prevent muddy water or the like from entering the housing inner space where the universal joint exists, and the grease nipple is attached in a state in which its injection port is exposed to the outside of the joint housing, there is an advantage that: grease is easily injected from the outside opposite to the required portion of the inner universal joint.

[ means for solving the problems 6]

Another aspect of the present invention to solve the above-described problems is to provide a universal joint in a middle of a power transmission shaft, and to provide a joint housing covering the universal joint, wherein a grease nipple of the universal joint, into which grease is poured, is attached to the joint housing in a state in which an inlet of the grease nipple is exposed to an outside of the joint housing.

[ action and Effect of the invention of means 6 ]

According to the structure of the present invention in the above-described solution 6, since the joint housing is provided to reliably prevent muddy water or the like from entering the housing space where the universal joint exists, and the grease nipple is attached in a state in which the injection port thereof is exposed to the outside of the joint housing, there is an advantage in that: grease is easily injected from the outside opposite to the required portion of the inner universal joint.

[ means for solving the problems 7]

Another aspect of the present invention to solve the above-described problems is a rear axle box supported on a body frame of a traveling body so as to be capable of swinging up and down by a link mechanism including a link member connecting the body frame side and the rear axle box side, a support bracket for supporting a front end portion of the link member being continuously provided on the body frame, the working machine including: a brake pedal provided on a floor of a driving part of the traveling body; a safety switch for detecting a state in which the brake pedal is depressed; and an operation body that is interlocked with a support shaft of the brake pedal and positions the brake pedal at a predetermined position by abutting the operation body with a stopper portion at a depression release position of the brake pedal, the support bracket having a stopper portion that abuts the operation body at a depression release position of the brake pedal, the safety switch being configured to detect a depression state of the brake pedal by abutting the operation body with an operation of a depression side of the brake pedal, a portion abutting the stopper portion and a portion abutting the safety switch being formed at different positions on the operation body, the brake pedal having a long pedal support rod having an axial direction along a direction orthogonal to a support shaft of the operation brake pedal and having a tread at a position away from the support shaft, a reinforcement plate extending in a direction intersecting the support shaft and along a length direction of the support shaft being welded and fixed to an outer surface of the pedal support rod, a stopper portion being formed at a position of the operation rod, a position of the operation rod being formed at a position opposite to the pedal support shaft, a position of the pedal support rod being formed at a position opposite to the pedal support shaft, a position of the pedal being formed at a position opposite to the pedal support shaft, a position being formed at a position opposite to the pedal support shaft, and being formed at a position opposite to the operation side of the operation shaft, the locking lever is configured to perform a swinging motion about the swinging fulcrum, so that the locking lever can be swung to a side where the locking lever is engaged with the brake pedal and a side where the locking lever is released.

[ action and Effect of the invention of means 7 ]

According to the configuration of the present invention in the above-described solution 7, the operation body for positioning the return position of the brake pedal is utilized, and the operation of the operation body to the depression side of the brake pedal can be detected by the safety switch.

That is, since the brake is not detected to be depressed by the operating body being away from the return position of the brake pedal, but is detected to be depressed by the operating body being in contact with the safety switch, detection with less false operation is facilitated, and the detecting means can detect the brake without using an expensive potentiometer and can use the operating body for positioning the return position, thereby further providing an advantage of low cost.

Further, since the portion of the operating body that abuts the stopper portion and the portion that abuts the safety switch are formed at different portions, there is an advantage in that the return position of the brake pedal and the depressed state determination position of the brake pedal can be easily set at any appropriate positions.

Furthermore, there are advantages in that: as a detection unit for a brake pedal used in a working machine having a rear axle box supported on a body frame by a link mechanism, a cross bar, and the like, a support bracket and an operating body for attaching a link member can be effectively used, and a simple structure can be achieved.

And, has the following advantages: the strength of the pedal support rod can be improved by providing the outer surface of the support shaft and the lower surface of the pedal support rod with a plate-like reinforcing plate extending in the direction intersecting the support shaft and along the longitudinal direction of the pedal support rod.

Since the brake pedal has the lock lever that can be locked in the depressed state of the brake pedal, the brake pedal can be maintained in a predetermined depressed state.

And, has the following advantages: the lock lever has a pivot point on the lower surface side of the driver floor, protrudes upward through an insertion opening formed in a pedal support rod of the driver floor, and is formed with an intermediate portion so as to be positioned in front of the front end of the insertion opening in a buckled state, so that the width in the front-rear direction of the insertion opening formed in the driver floor can be reduced, and the area on the upper surface side of the driver floor can be easily ensured widely.

[ means for solving the problems 8]

Another aspect of the present invention to solve the above-described problems is a rear axle box supported on a body frame of a traveling body so as to be capable of swinging up and down by a link mechanism including a link member connecting the body frame side and the rear axle box side, a support bracket for supporting a front end portion of the link member being continuously provided on the body frame, the working machine including: a brake pedal provided on a floor of a driving part of the traveling body; a safety switch for detecting a state in which the brake pedal is depressed; and an operation body that is linked to a support shaft of the brake pedal and that positions the brake pedal at a predetermined position by abutting the stopper portion at a depression release position of the brake pedal, wherein the support bracket includes a stopper portion that abuts the operation body at a depression release position of the brake pedal, wherein the safety switch is configured such that the depression state of the brake pedal is detected by abutting the operation body with an operation of the brake pedal, wherein a portion abutting the stopper portion and a portion abutting the safety switch are formed at different positions in the operation body, wherein the brake pedal includes an elongated pedal support rod having an axial direction along a direction orthogonal to a support shaft for operating the brake, and wherein a tread is provided at a position apart from the support shaft, and wherein a reinforcing plate extending in a direction intersecting the support shaft and along a longitudinal direction of the plate-shaped support rod is welded and fixed to the outer surface of the support shaft and the lower surface of the pedal support rod.

[ action and Effect of the invention of means 8 ]

According to the configuration of the present invention in the above-described solution 8, the operation body for positioning the return position of the brake pedal is utilized, and the operation of the operation body to the depression side of the brake pedal can be detected by the safety switch.

That is, since the brake is not depressed by the operating body being away from the return position of the brake pedal, but by the operating body being brought into contact with the safety switch, the detection of the depression of the brake is easily performed, and the detection means can be detected by a switch without using an expensive potentiometer, and the operating body for positioning the return position is used, so that there is an advantage that the cost can be reduced.

[ means for solving the problems 9]

Another aspect of the present invention to solve the above-described problems is a rear axle box supported on a body frame of a traveling body so as to be capable of swinging up and down by a link mechanism including a link member connecting the body frame side and the rear axle box side, a support bracket for supporting a front end portion of the link member being continuously provided on the body frame, the working machine including: a brake pedal provided on a floor of a driving part of the traveling body; a safety switch for detecting a state in which the brake pedal is depressed; and an operation body that is linked with the support shaft of the brake pedal and that is brought into contact with a stopper portion at a depression release position of the brake pedal to position the brake pedal at a predetermined position, wherein the support bracket has a stopper portion that is brought into contact with the operation body at the depression release position of the brake pedal, and wherein the safety switch is configured to detect the depression state of the brake pedal by the contact with the operation body in response to an operation on the depression side of the brake pedal, and wherein a portion that is brought into contact with the stopper portion and a portion that is brought into contact with the safety switch are formed at different portions on the operation body.

[ action and Effect of the invention of means 9 ]

According to the configuration of the present invention in the above-described solution 9, the operation body for positioning the return position of the brake pedal is utilized, and the operation of the operation body to the depression side of the brake pedal can be detected by the safety switch.

That is, since the brake is not detected to be depressed by the operating body being away from the return position of the brake pedal, but is detected to be depressed by the operating body being in contact with the safety switch, detection with less false operation is facilitated, and the operating body for positioning the return position is used as the detecting means without using an expensive potentiometer, which is advantageous in that it is possible to obtain a low cost.

[ means for solving the problem 10]

Another aspect of the present invention to solve the above-described problems is to provide a liquid crystal display device comprising: a brake pedal provided on a floor of a driving part of the traveling body; a safety switch for detecting a state in which the brake pedal is depressed; and an operation body that is linked with the support shaft of the brake pedal and that is brought into contact with a stopper portion at a depression release position of the brake pedal to position the brake pedal at a predetermined position, wherein the safety switch is configured to detect a depression state of the brake pedal by contact with the operation body in response to an operation of the brake pedal on a depression side, and a portion that is brought into contact with the stopper portion and a portion that is brought into contact with the safety switch are formed at different portions on the operation body.

[ action and Effect of the invention of means for solving the problem 10]

According to the configuration of the present invention of the above-described solution 10, the operation body for positioning the return position of the brake pedal is utilized, and the operation of the operation body to the depression side of the brake pedal can be detected by the safety switch.

[ means of solving 11]

Another aspect of the present invention to solve the above-described problems is to provide a liquid crystal display device comprising: a brake pedal provided on a floor of a driving part of the traveling body; a safety switch for detecting a state in which the brake pedal is depressed; and an operating body that is linked with the support shaft of the brake pedal and that is brought into contact with the stopper portion at a depression release position of the brake pedal to position the brake pedal at a predetermined position, wherein the safety switch is configured to detect a depression state of the brake pedal by contact with the operating body in response to an operation of the brake pedal on a depression side.

[ action and Effect of the invention of means for solving 11]

According to the configuration of the present invention of the above-described solution 11, the operation body for positioning the return position of the brake pedal is utilized, and the operation of the operation body to the depression side of the brake pedal can be detected by the safety switch.

[ means for solving the problems 12]

Another aspect of the present invention to solve the above-described problems is a traveling machine according to the present invention, wherein a transmission case is fixed to a machine frame of the traveling machine, and a rear axle box is supported by the machine frame so as to be capable of swinging up and down by a link mechanism including: an upper link having a swing fulcrum at a height position close to the body frame; and a lower link having a swing fulcrum position at a position lower than a swing fulcrum of the upper link on a lower side of the machine body frame, wherein a transmission shaft for transmitting a driving force to the rear axle box to a traveling system is provided in the transmission case, and a PTO shaft for fertilizing which outputs the driving force from the transmission shaft to a fertilizing device is provided on a lower side of an imaginary line connecting an axle center of the fertilizing shaft to the axis of the traveling system via an intermediate shaft, wherein the PTO shaft for fertilizing is disposed at a position higher than the swing fulcrum of the upper link and within a vertical width of the machine body frame, wherein the PTO shaft for fertilizing is disposed on a lateral side of the transmission shaft which is transmitted to the traveling system on a left-right side of the transmission shaft, wherein an intermediate shaft provided at a position lower than the swing fulcrum of the upper link is provided on a lower side of the transmission shaft which is rotated to the traveling system, and on a lower side of the PTO shaft which is positioned on a lower side of the transmission shaft of the fertilizing shaft, and on a lower side of the PTO shaft of the virtual line connecting an axle center of the fertilizing shaft to the axis of the traveling system is provided on a lower side of the transmission shaft, and the PTO shaft for seeding device for seeding a planting device which is provided on a rear of the machine body frame or a planting frame as a side of the transmission shaft which is not higher than the axis of the intermediate shaft of the planting device in the traveling system, and the planting frame is provided in the vertical width of the traveling system.

[ action and Effect of the invention of means for solving means 12 ]

According to the configuration of the present invention of the above-described solution 12, in the traveling machine body having the rear axle box supported on the machine body frame by the link mechanism, the cross bar, and the like, since the space for arrangement of the drive shaft to the traveling system is secured at the lower side of the machine body frame, and the PTO shaft for fertilization is provided from the drive shaft of the traveling system via the intermediate shaft, the drive shaft and the power of the traveling system can be used as the drive system of the fertilizer apparatus, and simplification of the structure can be obtained.

Further, since the PTO shaft for fertilization is disposed at a position higher than the swing fulcrum of the upper link and within the vertical width of the machine frame, there is an advantage that: the machine frame itself, a link mechanism located on the lower side of the machine frame, and the like may be used as a protection member for the PTO shaft for fertilization.

Furthermore, there are advantages in that: the intermediate shaft is provided at a position lower than the swing fulcrum of the upper link and below an imaginary line connecting the axial center of the fertilizer application PTO shaft and the axial center of the drive shaft to the traveling system, whereby a space for disposing other devices can be formed above the intermediate shaft.

Further, since the intermediate shaft and the PTO shaft for fertilization are provided in a different fertilization power output box from the transmission, there is an advantage in that: the size of the gearbox is easily reduced, and the degree of freedom of the arrangement position of the fertilizing power output box is increased.

Further, since the planting operation system PTO shaft for transmitting the driving force to the planting or seeding operation device for planting the seedling is provided at a position higher than the swing fulcrum of the upper link, the planting operation system PTO shaft has the following advantage: the link mechanism located on the lower side of the body frame, the width of the body frame in the up-down direction, and the like may also be used as the protection member.

[ means for solving the problems 13]

Another aspect of the present invention to solve the above-described problems is a traveling machine according to the present invention, wherein a transmission case is fixed to a machine frame of the traveling machine, and a rear axle box is supported by the machine frame so as to be capable of swinging up and down by a link mechanism including: an upper link having a swing fulcrum at a height position close to the body frame; and a lower link having a swing fulcrum position at a position lower than a swing fulcrum of the upper link on a lower side of the machine body frame, wherein a transmission shaft for transmitting a driving force to the rear axle box to a traveling system is provided in the transmission case, and a PTO shaft for fertilizing which outputs the driving force from the transmission shaft to a fertilizing device is provided via an intermediate shaft, wherein the PTO shaft for fertilizing is disposed at a position higher than the swing fulcrum of the upper link and within a width of the machine body frame in a vertical direction, the PTO shaft for fertilizing is disposed at a position higher than the swing fulcrum of the upper link on a lateral side of the transmission shaft for transmitting to the traveling system, an intermediate shaft provided at a position lower than the swing fulcrum of the upper link is provided at a position higher than the PTO shaft for seeding to the traveling system, and is provided at a position lower than a virtual line connecting an axial center of the PTO shaft for fertilizing and an axial center of the transmission shaft for seeding to the traveling system, and a sowing device for sowing a series of the PTO which is provided at a rear part of the traveling machine body and is not higher than the transmission shaft for seeding system by the intermediate shaft and the planting system.

[ action and Effect of the invention of means for solving means 13 ]

According to the configuration of the present invention in the above-described solution 13, in the traveling machine body having the rear axle box supported on the machine body frame by the link mechanism, the cross bar, and the like, since the space for arrangement of the drive shaft to the traveling system is secured at the lower side of the machine body frame, and the PTO shaft for fertilization is provided from the drive shaft of the traveling system via the intermediate shaft, the drive shaft and the power of the traveling system can be used as the drive system of the fertilizer apparatus, and simplification of the structure can be obtained.

Further, since the planting work system PTO shaft for the planting series device for planting or sowing that transmits the driving force to the seedling is provided at a position higher than the swing fulcrum of the upper link, the planting work system PTO shaft has the following advantage: a link mechanism or the like located on the lower side of the body frame may also be used as the protection member.

[ means for solving the problems 14]

Another aspect of the present invention to solve the above-described problems is a traveling machine according to the present invention, wherein a transmission case is fixed to a machine frame of the traveling machine, and a rear axle box is supported by the machine frame so as to be capable of swinging up and down by a link mechanism including: an upper link having a swing fulcrum at a height position close to the body frame; and a lower link having a swing fulcrum position at a position lower than a swing fulcrum of the upper link and spaced apart from a lower side of the machine body frame, wherein a transmission shaft for transmitting a driving force to the rear axle box to a traveling system is provided in the transmission case, and a PTO shaft for fertilization is provided which outputs the driving force from the transmission shaft to a fertilizer apparatus via an intermediate shaft, wherein the PTO shaft for fertilization is disposed at a position higher than the swing fulcrum of the upper link and within a vertical width of the machine body frame, the PTO shaft for fertilization is spaced apart from a lateral side of the transmission shaft for transmitting to the traveling system, an intermediate shaft provided at a position lower than the swing fulcrum of the upper link is provided at a position upper side of the transmission shaft for rotating to the traveling system and lower than the PTO shaft for fertilization, and the intermediate shaft as a transmission system branching from the transmission shaft of the traveling system and the PTO shaft for fertilization are provided at a lower side of an imaginary line connecting an axial center of the PTO of the fertilizing shaft and an axial center of the transmission shaft for rotating to the traveling system, and the PTO shaft for fertilization is provided at a different power transmission from the transmission case.

[ action and Effect of the invention of means for solving 14 ]

According to the configuration of the present invention of the above-described solution 14, in the traveling machine body having the rear axle box supported on the machine body frame by the link mechanism, the cross bar, and the like, since the space for arrangement of the drive shaft to the traveling system is secured at the lower side of the machine body frame, and the PTO shaft for fertilization is provided from the drive shaft of the traveling system via the intermediate shaft, the drive shaft and the power of the traveling system can be used as the drive system of the fertilizer apparatus, and simplification of the structure can be obtained.

[ means for solving the problems 15]

Another aspect of the present invention to solve the above-described problems is a traveling machine according to the present invention, wherein a transmission case is fixed to a machine frame of the traveling machine, and a rear axle box is supported by the machine frame so as to be capable of swinging up and down by a link mechanism including: an upper link having a swing fulcrum at a height position close to the body frame; and a lower link having a swing fulcrum position at a position lower than the swing fulcrum of the upper link and spaced apart from the lower side of the machine body frame, wherein a transmission shaft for transmitting a driving force to the rear axle box to a traveling system is provided in the transmission case, and a PTO shaft for fertilization is provided for outputting the driving force from the transmission shaft to a fertilizer applying device via an intermediate shaft, wherein the PTO shaft for fertilization is disposed at a position higher than the swing fulcrum of the upper link and within a vertical width of the machine body frame, the PTO shaft for fertilization is spaced apart from a lateral side of the transmission shaft for transmitting to the traveling system, and an intermediate shaft provided at a position lower than the swing fulcrum of the upper link is disposed at an upper side of the transmission shaft for rotating to the traveling system and at a lower side of the PTO shaft for fertilization, and is disposed at a lower side of an imaginary line connecting an axis of the PTO shaft for fertilization and an axis of the transmission shaft for rotating to the traveling system.

[ action and Effect of the invention of means 15 ]

According to the configuration of the present invention in the above-described solution 15, in the traveling machine body having the rear axle box supported on the machine body frame by the link mechanism, the cross bar, and the like, since the space for arrangement of the drive shaft to the traveling system is secured at the lower side of the machine body frame, and the PTO shaft for fertilization is provided from the drive shaft of the traveling system via the intermediate shaft, the drive shaft and the power of the traveling system can be used as the drive system of the fertilizer apparatus, and simplification of the structure can be obtained.

[ means for solving the problems 16]

Another aspect of the present invention to solve the above-described problems is a traveling machine according to the present invention, wherein a transmission case is fixed to a machine frame of the traveling machine, and a rear axle box is supported by the machine frame so as to be capable of swinging up and down by a link mechanism including: an upper link having a swing fulcrum at a height position close to the body frame; and a lower link having a swing fulcrum position at a position lower than the swing fulcrum of the upper link and spaced apart from the lower side of the machine body frame, wherein a transmission shaft for transmitting a driving force to the rear axle box to a traveling system is provided in the transmission case, a PTO shaft for fertilizing is provided to output the driving force from the transmission shaft to the fertilizing device via an intermediate shaft, the PTO shaft for fertilizing is disposed at a position higher than the swing fulcrum of the upper link and within a width of the machine body frame in the vertical direction, and the intermediate shaft is provided at a position lower than the swing fulcrum of the upper link.

[ action and Effect of the invention of means for solving 16]

According to the configuration of the present invention of the above-described solution 16, in the traveling machine body having the rear axle box supported on the machine body frame by the link mechanism, the cross bar, and the like, since the space for arrangement of the drive shaft to the traveling system is secured at the lower side of the machine body frame, and the PTO shaft for fertilization is provided from the drive shaft of the traveling system via the intermediate shaft, the drive shaft and the power of the traveling system can be used as the drive system of the fertilizer apparatus, and simplification of the structure can be obtained.

Furthermore, there are advantages in that: by providing the intermediate shaft at a position lower than the pivot point of the upper link, a space for other device arrangement can be formed above the intermediate shaft.

[ means for solving the problems 17]

Another aspect of the present invention to solve the above-described problems is a traveling machine according to the present invention, wherein a transmission case is fixed to a machine frame of the traveling machine, and a rear axle box is supported by the machine frame so as to be capable of swinging up and down by a link mechanism including: an upper link having a swing fulcrum at a height position close to the body frame; and a lower link having a swing fulcrum position at a position lower than the swing fulcrum of the upper link and spaced apart from the lower side of the machine body frame, wherein a transmission shaft for transmitting a driving force to the rear axle box to a traveling system is provided in the transmission case, a PTO shaft for fertilizing is provided in which the driving force is outputted from the transmission shaft to the fertilizing device through an intermediate shaft, and the PTO shaft for fertilizing is disposed at a position higher than the swing fulcrum of the upper link and within a width of the machine body frame in the up-down direction.

[ action and Effect of the invention of means for solving means 17 ]

According to the configuration of the present invention in the above-described solution 17, in the traveling machine body having the rear axle box supported on the machine body frame by the link mechanism, the cross bar, and the like, since the space for arrangement of the drive shaft to the traveling system is secured at the lower side of the machine body frame, and the PTO shaft for fertilization is provided from the drive shaft of the traveling system via the intermediate shaft, the drive shaft and the power of the traveling system can be used as the drive system of the fertilizer apparatus, and simplification of the structure can be obtained.

[ means for solving the problems 18]

Another aspect of the present invention to solve the above-described problems is a traveling machine according to the present invention, wherein a transmission case is fixed to a machine frame of the traveling machine, and a rear axle box is supported by the machine frame so as to be capable of swinging up and down by a link mechanism including: an upper link having a swing fulcrum at a height position close to the body frame; and a lower link having a swing fulcrum position at a position lower than the swing fulcrum of the upper link and spaced apart from the lower side of the body frame, wherein a transmission shaft for transmitting a driving force to the rear axle box to a traveling system is provided in the transmission case, a PTO shaft for fertilizing is provided in which the driving force is outputted from the transmission shaft to the fertilizing device via an intermediate shaft, and the PTO shaft for fertilizing is disposed at a position higher than the swing fulcrum of the upper link.

[ action and Effect of the invention of means for solving 18 ]

According to the configuration of the present invention of the above-described solution 18, in the traveling machine body having the rear axle box supported on the machine body frame by the link mechanism, the cross bar, and the like, since the space for arrangement of the drive shaft to the traveling system is secured at the lower side of the machine body frame, and the PTO shaft for fertilization is provided from the drive shaft of the traveling system via the intermediate shaft, the drive shaft and the power of the traveling system can be used as the drive system of the fertilizer apparatus, and simplification of the structure can be obtained.

Further, since the PTO shaft for fertilization is disposed at a position higher than the swing fulcrum of the upper link, there is an advantage that: a link mechanism or the like located on the lower side of the machine frame may be used as a protection member for the PTO shaft for fertilization.

[ means for solving the problems 19]

Another aspect of the present invention to solve the above-described problems is a transmission shaft of a planting operation system PTO shaft or a traveling system provided in a transmission case for transmitting a driving force to a planting operation device for planting or seeding, wherein an output bevel gear engaged with a bevel gear on an upstream side of the transmission is detachably provided in the transmission case, a receiving member is provided at a position below the output bevel gear at a slight gap and located below the output bevel gear, and the gap between the receiving member and the output bevel gear is set to the following extent: the output bevel gear is maintained in a state of being attached to the transmission shaft of the plant operation system PTO shaft or the traveling system, in a state of being separated from the receiving member, the receiving member receives the output bevel gear from below in a state of being pulled out of the output bevel gear, and maintains an engaged state of the output bevel gear and the bevel gear on the transmission upstream side, the receiving member being constituted by an operating lever for a sub-shift operation for operating a sub-shift mechanism provided in the transmission case.

[ action and Effect of the invention of means for solving 19 ]

According to the configuration of the present invention in the above-described solution 19, since the output bevel gear can be received from below in a state in which the PTO shaft of the plant operation system or the drive shaft of the traveling system is pulled out from the output bevel gear, there is an advantage in that: convenience can be realized during reassembly, and maintenance is easy to carry out.

In addition, since the operating lever for the sub-shift operation that operates the sub-shift mechanism is used as a member for receiving the output bevel gear from below, there is an advantage in that the structure can be simplified.

[ means for solving the problems 20]

Another aspect of the present invention to solve the above-described problems is a transmission shaft of a planting operation system PTO shaft or a traveling system provided in a transmission case for transmitting a driving force to a planting operation device for planting or seeding, wherein an output bevel gear engaged with a bevel gear on an upstream side of the transmission is detachably provided in the transmission case, a receiving member is provided at a position below the output bevel gear at a slight gap and located below the output bevel gear, and the gap between the receiving member and the output bevel gear is set to the following extent: the output bevel gear is maintained in a state of being attached to the transmission shaft of the PTO shaft or the traveling system of the plant operation system in a state in which the output bevel gear is separated from the receiving member, and the receiving member receives the output bevel gear from below in a state in which the transmission shaft of the PTO shaft or the traveling system of the plant operation system is pulled out of the output bevel gear, and maintains an engaged state in which the output bevel gear is engaged with the bevel gear on the upstream side of the transmission.

[ action and Effect of the invention of means for solving 20 ]

According to the configuration of the present invention of the above-described solution means 20, in a state in which the PTO shaft of the plant operation system or the drive shaft of the traveling system is pulled out from the output bevel gear, the output bevel gear can be received from below, and therefore, there is an advantage in that: convenience can be realized during reassembly, and maintenance is easy to carry out.

[ means for solving the problems 21]

Another aspect of the present invention to solve the above-described problems is to provide a liquid crystal display device comprising: an operation shaft for operating an operation mechanism in the transmission; and an operation member for operating the operation shaft from outside the transmission case, wherein the operation member is made of a sheet metal material bent so as to sandwich the outer protruding portion of the operation shaft from both sides, the operation member is configured to pin-connect the plate-shaped portions located on both sides of the operation shaft in the vicinity of the portion sandwiching the operation shaft, and the operation shaft is an operation shaft of a planting operation clutch for turning off or on a driving force for a planting operation device for planting or seeding.

[ action and Effect of the invention of means for solving 21]

According to the structure of the present invention of the above-described solution 21, since the operation member is constituted by a sheet metal material which is bent so as to sandwich the outer protruding portion of the operation shaft from both sides, there is an advantage in that: an operation member excellent in strength can be obtained at low cost.

In addition, when the operation member is made of a sheet metal material, since the plate-like portions are connected by pins, there is an advantage in that simplification in manufacturing and processing can be obtained.

[ means for solving the problems 22]

Another aspect of the present invention to solve the above-described problems is to provide a liquid crystal display device comprising: an operation shaft for operating an operation mechanism in the transmission; and an operating member for operating the operating shaft from outside the transmission case, the operating member being made of a sheet metal material bent so as to sandwich the outer protruding portion of the operating shaft from both sides, and connecting the sheet portions located on both sides of the operating shaft to each other in the vicinity of a portion sandwiching the operating shaft.

[ action and Effect of the invention of means for solving 22]

According to the structure of the present invention of the above-described solving means 22, since the operation member is constituted by a sheet metal material which is bent in a state of sandwiching the outer protruding portion of the operation shaft from both sides, there is an advantage that: an operation member excellent in strength can be obtained at low cost.

[ means for solving the problems 23]

In order to solve the above-described problems, another aspect of the present invention is to provide a steering box having a steering handle on an upper side of a transmission box, a steering seat is provided on a rear side of the steering box, a main transmission device constituted by a hydrostatic continuously variable transmission device and a plurality of sub-transmission mechanisms constituted by gear transmission devices are provided on the transmission box, a sub-transmission lever for performing a shift operation on one of the sub-transmission mechanisms is projected above an outer side of the transmission box and into a space in the steering box, a hand grip portion of the sub-transmission lever is projected from an opening provided in a lower portion of the steering box toward the steering seat side in a state where a steering column is received on an upper portion of the sub-transmission lever, and the sub-transmission lever is configured to be vertically separable inside the steering box.

[ action and Effect of the invention of means for solving means 23 ]

According to the configuration of the present invention of the above-described solution 23, since the steering column can be brought into a state of receiving the auxiliary lever, there is an advantage that: even if a pushing force or an external force is applied to move the auxiliary lever laterally and laterally when the auxiliary lever is operated, the auxiliary lever can be stably and easily held at a desired position against the pushing force or the external force.

Further, since the sub-shift lever can be divided up and down, there is an advantage that: maintenance such as replacement of a seal on a lower portion side erected from the transmission is easy.

[ means for solving the problems 24]

In order to solve the above-described problems, another aspect of the present invention is to provide a steering box having a steering handle on an upper side of a transmission box, a steering seat on a rear side of the steering box, a main transmission device constituted by a hydrostatic continuously variable transmission device and a plurality of sub-transmission mechanisms constituted by a gear transmission device on the transmission box, wherein a sub-transmission lever for performing a shift operation on one of the sub-transmission mechanisms protrudes above an outer side of the transmission box and into a space in the steering box, and a hand grip portion of the sub-transmission lever protrudes from an opening provided in a lower portion of the steering box toward the steering seat side in a state where a steering column is received on an upper portion of the sub-transmission lever.

[ action and Effect of the invention of means 24 ]

According to the structure of the present invention of the above-described solving means 24, since the steering column can be brought into a state of receiving the auxiliary lever, there is an advantage that: even if a pushing force or an external force is applied to move the auxiliary lever laterally and laterally when the auxiliary lever is operated, the auxiliary lever can be stably and easily held at a desired position against the pushing force or the external force.

[ means for solving 25]

Another embodiment of the present invention to solve the above-described problems is to provide a plant-seeding apparatus for planting or seeding, which comprises a plant-seeding apparatus.

[ action and Effect of the invention of means for solving 25]

The structure of the present invention according to the above-mentioned solving means 25 has the following advantages: an apparatus suitable for a plant-seeding machine having a plant-seeding device for planting or seeding.

Drawings

Fig. 1 is a left side view of a riding rice transplanter.

Fig. 2 is a plan view of the riding rice transplanter.

Fig. 3 is a left side view of the lower portion of the body from the transmission to the rear axle box.

Fig. 4 is a right side view of the lower portion of the body from the transmission to the rear axle box.

Fig. 5 is a left-right longitudinal sectional view from the transmission case to the body intermediate position of the rear axle box.

Fig. 6 is a plan view showing a lower portion of the body from the transmission case to the rear axle box.

FIG. 7 is a top view of the planting system drive shaft portion removed from the lower portion of the machine body from the gearbox to the rear axle housing.

FIG. 8 is a cross-sectional view showing the universal joint portion of the travel drive system.

Fig. 9 is a perspective view showing a transmission case.

Fig. 10 is a plan view showing the surroundings of the transmission.

Fig. 11 is a right side view of the transmission.

Fig. 12 is a perspective view showing a brake pedal and a lock operation member on the upper side of the driver's step.

Fig. 13 is a diagram showing a power transmission system to the traveling apparatus.

Fig. 14 is a diagram showing a power transmission system to the seedling planting device.

Fig. 15 is a longitudinal cross-sectional view of the transmission in the front-rear direction.

Fig. 16 is an expanded cross-sectional view showing the positional relationship between a drive shaft and a rotation shaft of a traveling system in a transmission case.

FIG. 17 is a partial cross-sectional view of the planting clutch and its operating member showing the planting transmission within the gearbox.

Fig. 18 shows a crank member for clutch operation, fig. 18 (a) is a plan view of the crank member expanded into a flat plate shape, and fig. 18 (b) is a perspective view of the crank member after bending and fitting.

Fig. 19 is a perspective view showing the brake pedal and the lock operation member.

Fig. 20 shows an operation mode of the brake pedal and the lock operation member, fig. 20 (a) shows a side view of the unlocked state, and fig. 20 (b) shows a side view of the locked state.

Fig. 21 is a cross-sectional view showing a joint boot according to another embodiment.

Symbol description

2. Seedling planting device (planting series operation device)

3. Gear box

4. Torque generator

10. Frame of machine body

10B 1 st support bracket

10C 2 nd support bracket

12. Driver seat

13. Power unit

14. Floor of driving part

15. Steering wheel

16. Main gear lever

18. Auxiliary gear lever

19. Rear axle box

35. Lower connecting rod

36. Upper connecting rod

37. Suspension spring

38. Cross bar

50. Brake pedal

50a tread

59. Locking lever

74. Traveling output shaft (Power transmission shaft)

101. Fertilizing power output box

103. Intermediate shaft

104. PTO shaft for fertilization

110. Operating body

111. Safety switch

120. Universal joint

121. Joint housing

123. Lubricating grease nozzle

130. Fertilizing device

Detailed Description

An example of an embodiment of the present invention will be described below based on the description of the drawings.

[ integral Structure ]

Fig. 1 is a right side view of a riding rice transplanter, which is an example of a plant-seeding-series working machine.

The riding rice transplanter has a pair of front wheels 11F capable of being steered and driven freely, and a pair of rear wheels 11R capable of being driven freely, below a machine frame 10, and a self-propelled traveling machine body 1 which receives power from an engine E mounted on the machine frame 10 and drives the front wheels 11F and the rear wheels 11R.

The power unit 13 having the engine E built in is provided on the floor 14 of the driving unit at the front of the traveling body 1, and the preliminary seedling placement tables 29 are provided on the left and right sides of the traveling body 1. A riding section having a steering wheel 15 and a driver seat 12 for steering the front wheels 11F is provided on a driver floor 14 on the rear side of the power section 13 and in the front-rear direction central portion of the traveling body 1.

A fertilizer applicator 130 is mounted on the rear portion of the driver seat 12. The fertilizer applicator 130 is configured to feed out fertilizer stored in the fertilizer tank 131 every predetermined amount from a feed-out device (not shown), and feed the fertilizer into the groover 132 provided in the seedling planting device 2 via a feed path (not shown), and feed the fertilizer into the field. The seedling planting device 2 is supported to be vertically movable via a link mechanism 25 having a hydraulic cylinder 28 for elevating and lowering on the rear side of the traveling body 1.

The riding type rice transplanter thus constructed performs a planting operation of planting rice and other seedlings in a field by using the seedling planting device 2.

The power unit 13 having the engine E built in is provided on the floor 14 of the driving unit at the front of the traveling body 1, and the preliminary seedling placement tables 29 are provided on the left and right sides of the traveling body 1. A riding section having a steering wheel 15 and a driver seat 12 for steering the front wheels 11F is provided on a driver floor 14 on the rear side of the power section 13 and in the front-rear direction central portion of the traveling body 1. At the rear of the traveling machine body 1, the seedling planting device 2 is supported to be vertically movable via a link mechanism 25 having a hydraulic cylinder 28 for elevating and lowering.

As shown in fig. 2, the seedling planting device 2 is configured in a six-row cultivation type, having: three gear boxes 21; a planting box 22 rotatably supported on the right lateral side and the left lateral side of the rear part of the transmission box 21; a pair of planting arms 23 (planting claw driving mechanism) provided at both ends of the planting box 22; ground trowel 24; and a seedling stage 20 for placing seedlings. Thus, as the seedling stage 20 is reciprocally and laterally driven in the lateral direction, the planting box 22 is rotationally driven, and the planting arms 23 alternately take out seedlings from the lower portion of the seedling stage 20 and plant the seedlings into the field.

A transmission case 3 for supporting the front wheels 11F is connected and fixed to the front part of the body frame 10 of the traveling body 1, and rear axle boxes 19 for mounting the rear wheels 11R on the left and right are supported at the rear part of the body frame 10. The front frame 10F extends forward from the transmission case 3, and the engine E is mounted laterally on the front frame 10F.

As shown in fig. 3, 9 and 10, the front axle box 3A extends laterally outward on both left and right sides of the transmission 3, and left and right

front wheels

11F, 11F are provided. A torque generator 4 (corresponding to a power steering device) is provided above the transmission case 3, and a steering wheel 15 is provided at an upper end of a steering shaft 15a standing upward from the torque generator 4. A main shift lever 16 for changing the vehicle speed by operating a hydrostatic continuously variable transmission 61 described later is disposed on a lateral side of the steering wheel 15.

The rear axle box 19 is supported by the body frame 10 by a known five-link suspension mechanism configured as follows.

As shown in fig. 3 and 4, a 1 st support bracket 10B in a downward hanging posture is fixed near the rear end of the transmission case 3 below a pair of front and

rear frames

10A, 10A long in the front-rear direction of the body frame 10. Further, a 2 nd support bracket 10C shorter than the 1 st support bracket 10B in a downward hanging posture is fixed to the lower side of the front and

rear frames

10A, 10A at an intermediate position between the transmission case 3 and the rear axle box 19.

A connection bracket 19A is fixed to a front portion of the rear axle box 19 integrally with the rear axle box 19. The lower end of the connection bracket 19A and the lower end of the 1 st support bracket 10B are connected by a lower link 35 (corresponding to a lower link (and a link member)), and the upper end of the connection bracket 19A and the 2 nd support bracket 10C are connected by a short upper link 36 (corresponding to an upper link (and a link member)).

The left and right connection brackets 19A are elastically supported by suspension springs 37 between the left and

right frames

10A, 10A facing forward and backward, respectively, so as to be movable up and down. As shown in fig. 6 and 7, the rear side intermediate portion of the rear axle box 19 is connected to the lower portion of one of the front and rear frames 10A via a cross bar 38, and allows the rear axle box 19 to move up and down, thereby restricting the lateral movement of the entire rear axle box.

Thus, the rear axle box 19 is connected by the short upper link 36 and the long lower link 35 in the left and right directions, and swings up and down about the two swing fulcrums x1, x2 of the swing fulcrums x1 at the lower end portion of the 1 st support bracket 10B and the swing fulcrums x2 of the 2 nd support bracket 10C.

[ Power Transmission System ]

The power of the engine E is input to the transmission 3, and is branched to the following two systems within the transmission 3: a travel drive system for driving the front wheel 11F, the rear wheel 11R, and the like of the travel drive system; and a planting series operation driving system for driving the seedling planting device 2 and the like as the planting series operation device.

[ concerning travel drive System ]

As shown in fig. 6, 7 and 10, a pair of left and right front axle boxes 3A are provided on both left and right lateral sides of the transmission 3. The front wheel 11F is rotatably supported by the front axle box 3A about an axis in the up-down direction.

As shown in fig. 10 and 13, a hydrostatic continuously variable transmission 61 (corresponding to a main transmission) is connected to the transmission 3 so as to be located on the left lateral side of the upper portion of the transmission 3. The hydrostatic continuously variable transmission 61 has an intermediate stop position, and is configured to continuously and freely shift from the intermediate stop position to the forward side and the reverse side. The hydrostatic continuously variable transmission 61 has a transmission input shaft 61a and a transmission output shaft 61b extending outward. The power of the engine E is transmitted to the shift input shaft 61a of the hydrostatic continuously variable transmission 61 through the belt transmission 61 c. The portion of the shift input shaft 61a located on the opposite side from the belt transmission mechanism 61c and the shift output shaft 61b are arranged to enter the inside of the transmission case 3.

A hydraulic pump 62 is connected to the right lateral side of the transmission 3. The pump input shaft 62a of the hydraulic pump 62 is arranged to enter the state of the interior of the transmission 3. The pump input shaft 62a is arranged in a concentric state with the shift input shaft 61a, and is spline-connected to rotate integrally with the shift input shaft 61a by the extension input shaft 61 d. Thereby, the power of the engine E is transmitted from the shift input shaft 61a of the hydrostatic continuously variable transmission 61 to the hydraulic pump 62, and the hydraulic pump 62 is driven.

The first transmission shaft 63 rotatably supported in the transmission case 3 is spline-connected to the transmission output shaft 61 b. The first transmission shaft 63 is externally fitted with a first shift gear 64 integrally rotated with the first transmission shaft 63 and slidably movable with respect to the first transmission shaft 63 by a spline structure. The first shift gear 64 integrally includes a first high-speed gear 64a and a first low-speed gear 64b having a diameter larger than that of the first high-speed gear 64 a.

On the transmission downstream side of the first transmission shaft 63, there is a second transmission shaft 65 supported in the transmission case 3 in parallel with the first transmission shaft 63. A large diameter gear 65a and a medium diameter gear 65b having a diameter smaller than that of the large diameter gear 65a are fixed to the second transmission shaft 65. By performing a shift operation on the first shift gear 64, power from the first transmission shaft 63 to the second transmission shaft 65 can be transmitted by selecting either one of engagement of the first high-speed gear 64a with the large-diameter gear 65a and engagement of the first low-speed gear 64b with the intermediate-diameter gear 65b. That is, the 1 st sub-transmission mechanism 60A is constituted by the first shift gear 64, the large diameter gear 65a and the intermediate diameter gear 65b of the second transmission shaft 65. A small diameter gear 65c having a diameter smaller than that of the intermediate diameter gear 65b is fixed to the second transmission shaft 65.

On the transmission downstream side of the second transmission shaft 65, there is a third transmission shaft 67 supported in the transmission case 3 in parallel with the second transmission shaft 65. The third transmission shaft 67 is externally fitted with a second shift gear 68 that rotates integrally with the third transmission shaft 67 and is slidably movable with respect to the third transmission shaft 67 by a spline structure. The second shift gear 68 integrally includes a second high-speed gear 68a and a second low-speed gear 68b having a diameter larger than that of the second high-speed gear 68 a. By performing a shift operation on the second shift gear 68, either one of the engagement of the intermediate diameter gear 65b with the second high speed gear 68a and the engagement of the small diameter gear 65c with the second low speed gear 68b is selected, and power that is shifted from the second drive shaft 65 to the third drive shaft 67 can be transmitted.

That is, the second shift gear 68, the intermediate diameter gear 65B and the small diameter gear 65c of the second transmission shaft 65 constitute the 2 nd sub-transmission mechanism 60B. A transmission gear 69 is fixed to the third transmission shaft 67. Further, a first bevel gear 70 is fixed to the third transmission shaft 67.

On the transmission downstream side of the third transmission shaft 67, a pair of front transmission shafts 71 parallel to the third transmission shaft 67 are butt-disposed. A differential mechanism 72 is provided between the pair of front side drive shafts 71. The differential case 72a of the differential mechanism 72 is rotatably supported inside the transmission case 3. The differential gear 69 fixed to the third transmission shaft 67 meshes with the driven gear 72b fixed to the differential case 72 a.

A differential lock body 72c that is integrally rotatable and slidably movable is externally fitted to one front side transmission shaft 71 of the pair of front side transmission shafts 71 by a key structure. The differential lock 72c can be switched to two states: a differentiable state (differential lock released state) in which the engagement is released with respect to the differential case 72 a; and an undevelorable state (differential lock state) in which the differential case 72a is engaged.

As shown in fig. 3, 5 and 13, a traveling output shaft 74 protruding rearward from the rear end portion of the transmission case 3 is provided at the rear portion of the transmission case 3. The traveling output shaft 74 has a second bevel gear 75 at a front end portion thereof. The second bevel gear 75 meshes with the first bevel gear 70 fixed to the third transmission shaft 67, whereby power is transmitted from the third transmission shaft 67 to the traveling output shaft 74.

The rear axle box 19 supports the pair of right and left rear wheels 11R, and the rear propeller shaft 77 is coupled to the traveling output shaft 74 and the rear propeller shaft 76 of the rear axle box 19. The power transmitted to the rear drive shaft 76 is transmitted to the left and right rear wheels 11R through the side clutch 73, respectively.

Thus, the power of the engine E is transmitted to the pair of right and left front wheels 11F through the transmission output shaft 61b, the first propeller shaft 63, the second propeller shaft 65, the third propeller shaft 67, the differential mechanism 72, and the front propeller shaft 71 of the hydrostatic continuously variable transmission 61, and is transmitted to the pair of right and left rear wheels 11R through the differential case 72a, the traveling output shaft 74, and the rear propeller shaft 76 of the differential mechanism 72.

In addition, the traveling output shaft 74 is inserted into a fertilizing power output case 101 different from the transmission case 3.

The fertilization power output box 101 has: a branch gear 102 provided on the traveling output shaft 74; an intermediate shaft 103 having an intermediate gear 103a meshed with the branch gear 102; and a PTO shaft 104 for fertilization engaged with the intermediate gear 103 a.

The fertilizer PTO shaft 104 is connected to the drive shaft 105 of the fertilizer apparatus 130.

The fertilizing power output case 101 is connected and fixed to the rear side of the transmission case 3 by a mounting bolt or the like, not shown.

As shown in fig. 5, the traveling output shaft 74 is positioned at the lowermost position among the shafts, and is disposed above the lower link 35 on the lower side of the machine frame 10. A fertilizer PTO shaft 104 is provided, and the fertilizer PTO shaft 104 outputs a driving force from the traveling output shaft 74 to the fertilizer applicator 130 via an intermediate shaft 103, and the fertilizer PTO shaft 104 is disposed at a position higher than the swing fulcrum x2 of the upper link 36 and within the vertical width of the machine frame 10.

The PTO shaft 104 for fertilization is located apart from the right lateral side of the traveling output shaft 74 in the left-right direction, and the intermediate shaft 103 provided at a position lower than the swing fulcrum x2 of the upper link 36 is located below the PTO shaft 104 for fertilization of the traveling output shaft 74 and below a virtual line L2 connecting the axial center of the PTO shaft 104 for fertilization and the axial center of the traveling output shaft 74.

In this way, the intermediate shaft 103 is positioned in a position deviated to the right and lateral direction below the virtual line L2 connecting the axial center of the PTO shaft 104 for fertilization and the axial center of the traveling output shaft 74, and a line segment connecting the axial center of the PTO shaft 104 for fertilization and the axial center of the traveling output shaft 74 with the axial center of the intermediate shaft 103 is in a buckling arrangement relation protruding downward toward the right.

Therefore, since the fertilizing power output box 101 protrudes to the upper left side less, the planting output shaft 92 (corresponding to the planting work system PTO shaft) is arranged compactly in a position on the lower side of the machine frame 10 and on the upper side of the lower link 35, effectively using the upper left region thereof. That is, the planting output shaft 92 extending from the transmission case 3 is provided at a position higher than the swing fulcrum x2 of the upper link 36 and within the vertical width of the machine frame 10.

[ concerning working device drive System ]

Next, a transmission structure of the working device to the seedling planting device 2 will be described.

As shown in fig. 14, on the transmission downstream side of the second transmission shaft 65, there is a fourth transmission shaft 80 supported in the transmission case 3 in parallel with the second transmission shaft 65. The second propeller shaft 65 is provided with an output gear 81 for operation that transmits power through a rear clutch 100 described later. The power of the second propeller shaft 65 is transmitted from the work output gear 81 to the fourth propeller shaft 80 through the torque limiter T.

A shift gear 84 for planting that rotates integrally with the fourth drive shaft 80 and is slidably movable with respect to the fourth drive shaft 80 is externally fitted to the fourth drive shaft 80 by a spline structure. The first planting gear 84 has a first planting low-speed gear 84a and a first planting high-speed gear 84b having a smaller diameter than the first planting low-speed gear 84a integrally.

The first transmission shaft 63 has a first slide fit gear 85a, a second slide fit gear 85b, a third slide fit gear 85c, a fourth slide fit gear 85d, and a fifth slide fit gear 85e supported rotatably relative to the first transmission shaft 63. The first slide fit gear 85a, the second slide fit gear 85b, the third slide fit gear 85c, the fourth slide fit gear 85d, and the fifth slide fit gear 85e are fixed to each other so as to rotate integrally, and the diameters of the gears become larger in the following order: the first slide fit gear 85a, the second slide fit gear 85b, the third slide fit gear 85c, the fourth slide fit gear 85d, and the fifth slide fit gear 85e.

By performing a sliding movement operation of the second shift lever 27, the shift gear 84 for planting can be selectively engaged with either one of the engagement of the low-speed gear 84a for planting with the first slide engaging gear 85a and the engagement of the high-speed gear 84b for planting with the fifth slide engaging gear 85e. Thus, the power transmitted from the planting shift gear 84 to the transmission downstream side can be shifted into two stages. In this way, the second shift mechanism S2 disposed in the transmission case 3 is configured by the shift gear 84 for planting, the second shift lever 27, the first slide fit gear 85a, the fifth slide fit gear 85e, and the like. That is, the second speed change mechanism S2 changes the interval (plant distance) of the seedling planting operation as the "ground operation" performed by the "operation device", that is, the seedling planting device 2, into two stages by shifting the power from the engine E into two stages (an example of the "multiple stage").

On the transmission downstream side of the fourth transmission shaft 80 and the first transmission shaft 63, there is a fifth transmission shaft 86 supported in the transmission case 3 and parallel to the first transmission shaft 63. The fifth transmission shaft 86 has a first transmission gear 87a, a second transmission gear 87b, a third transmission gear 87c, and a fourth transmission gear 87d supported so as to be rotatable with respect to each other, and the diameters of the gears decrease in the following order: a first transmission gear 87a, a second transmission gear 87b, a third transmission gear 87c, and a fourth transmission gear 87d. The first transmission gear 87a is always engaged with the first slide fit gear 85a, the second transmission gear 87b is always engaged with the second slide fit gear 85b, the third transmission gear 87c is always engaged with the third slide fit gear 85c, and the fourth transmission gear 87d is always engaged with the fourth slide fit gear 85 d. A third bevel gear 88 is fixed to the fifth transmission shaft 86.

The first shift lever 26 inserted into the center of the fifth transmission shaft 86 is slid in the axial direction, and a transmission ball (not shown) engaged with and supported by the fifth transmission shaft 86 is pushed and displaced radially outward by a large-diameter cam portion 26a provided at one end side of the first shift lever 26. By engaging the transmission balls in the center holes of any one of the first transmission gear 87a, the second transmission gear 87b, the third transmission gear 87c, and the fourth transmission gear 87d, only one of the four pairs of constant mesh gears is selected to perform the mesh transmission, and the power transmitted to the fifth transmission shaft 86 on the driven side can be changed to four stages. In this way, the first transmission gear 87a, the second transmission gear 87b, the third transmission gear 87c, the fourth transmission gear 87d, the first shift lever 26, the transmission balls, and the like constitute the first shift mechanism S1 disposed in the transmission 3. That is, the first speed change mechanism S1 changes the interval (plant distance) of the seedling planting operation as the "ground operation" performed by the "operation device", that is, the seedling planting device 2, into four stages by changing the power from the engine E into four stages (an example of the "multiple stage").

Thus, the power of the planting system is composed of: a total of eight-speed shift can be performed by a combination of a four-speed shift by operation of the first shift operating lever 26 and a two-speed shift by operation of the second shift operating lever 27.

A cylindrical body 90 supported rotatably relative to the transmission case 3 is provided on the rear side of the transmission case 3. The cylindrical body 90 has a fourth bevel gear 91 (corresponding to the output bevel gear). The fourth bevel gear 91 meshes with the third bevel gear 88 fixed to the fifth transmission shaft 86.

A planting output shaft 92 (corresponding to a planting operation system PTO shaft) is provided at the rear portion of the transmission case 3, and the planting output shaft 92 protrudes rearward from the rear end portion of the transmission case 3 and is located concentrically with the cylinder 90 inside the cylinder 90. A planting clutch 93 is externally fitted to the planting output shaft 92 by a spline structure, and the planting clutch 93 integrally rotates with the planting output shaft 92 and slidably moves with respect to the planting output shaft 92. The planting clutch 93 can be switched between a state of engagement with the cylinder 90 and a state of disengagement without engagement with the cylinder 90. When the planting clutch 93 is set to the engaged state, the power of the fifth transmission shaft 86 is transmitted to the planting output shaft 92 via the third bevel gear 88, the fourth bevel gear 91, the cylinder 90, and the planting clutch 93. On the other hand, when the planting clutch 93 is in the disengaged state, the power transmission from the fifth propeller shaft 86 to the planting output shaft 92 can be cut off. The planting clutch 93 is biased to the engaged state and withdraws the operation shaft 94 supported by the sleeve 95, thereby switching between the engaged state and the disengaged state.

As shown in fig. 14, power of the planting output shaft 92 is transmitted to an input shaft 98 of a feed box 97 by rotating a drive shaft 96. The drive of the planting arm 23 and the reciprocating movement of the seedling stage 20 in linkage with the planting operation of the planting arm 23 are performed by the power input to the input shaft 98. Thus, planting of seedlings into the field is performed using the planting speed after the speed change by the first speed change mechanism S1 and the second speed change mechanism S2 in correspondence with the traveling speed of the machine body. Thus, the first speed change mechanism S1 and the second speed change mechanism S2 can be operated to perform the transplanting at a desired planting interval (planting distance).

A rear clutch 100 is provided on a transmission path for transmitting power from the second transmission shaft 65 provided in the gearbox 3 to the seedling planting device 2. The rear clutch 100 is configured to transmit the swinging operation of the main shift lever 16 provided on the lateral side of the steering wheel 15 to the reverse shift position R side through a connection mechanism not shown.

The rear clutch 100 is configured to be engaged with and disengaged from a work output gear 81 provided relatively freely on the downstream side of the transmission of the second transmission shaft 65 by the movement in the axial direction, and to be engaged when approaching the work output gear 81, to be brought into a clutch engaged state, and to transmit power to the seedling planting device 2. When the seedling planting device moves in a direction away from the work output gear 81, the engagement is released, and the clutch is disengaged, so that the power transmission to the seedling planting device 2 is released.

This can release the power transmission to the seedling planting device 2 when the traveling body 1 is retreated.

[ Structure of gearbox ]

Fig. 10 to 15 show the structure of the transmission case 3.

The transmission case 3 is constituted by a combination of divided cases of a case-like case main body portion 30 and a cover-like case portion 31, the case main body portion 30 having an opening formed at one end side in the lateral direction, and the cover-like case portion 31 being provided so as to close the opening. The case main body 30 and the lid-shaped case 31 are made of an aluminum casting, and are integrated by bolting the lid-shaped case 31 to face the opening of the case main body 30.

As shown in fig. 15, the box main body portion 30 includes: a front wall 30f that forms a front surface of the box-shaped transmission 3 in the traveling direction of the machine body; a rear wall 30r constituting a rear surface of the transmission case 3; an upper wall 30t constituting an upper surface of the transmission case 3; a bottom wall 30b constituting a bottom surface of the transmission case 3; and a transverse wall 30s constituting the left side face of the transmission 3. The cover-shaped case portion 31 forms a right side surface of the transmission case 3, and the transmission case 3 is formed in a substantially rectangular case shape as a whole.

As shown in fig. 9 and 10, a hydraulic torque generator 4 as a power steering device is mounted on the upper surface of the transmission case 3 at a position slightly inclined backward in front of the upper wall 30t of the case main body 30. The steering shaft 15a extends obliquely rearward and upward from the torque generator 4. An output shaft 4a, which is coaxial with the steering shaft 15a and faces downward, is provided so as to protrude into the transmission 3 from the lower side of the torque generator 4. A steering rotation shaft 41, which is coaxial with the steering operation shaft 15a, is connected to the lower end side of the output shaft 4 a.

As shown in fig. 4 to 6, a bottom opening 32 for inserting and extracting a steering wheel 41 is formed in a front position on the bottom wall 30b side of the case main body portion 30 of the transmission case 3.

The bottom opening 32 is formed so that the steering shaft 41 can be inserted into and removed from the lower side of the transmission case 3, and also serves as a mounting portion for a lower bearing 43d for pivotally supporting the lower end side of the steering shaft 41.

The steering rotation shaft 41 has a pinion gear 42 integrally formed near a lower end thereof opposite to the upper end 41a, and a lower bearing 43d is fitted to a shaft portion extending toward a lower side of a portion where the pinion gear 42 of the steering rotation shaft 41 is present, and fitted to the bottom opening 32.

A separate bottom opening 33 is formed in the bottom wall 30b of the case main body 30 of the transmission case 3 at a position that is separated to the rear side from the position where the bottom opening 32 for inserting and extracting the steering shaft 41 is formed, and the separate bottom opening 33 is provided for attaching an arm support shaft 45 that rotates integrally with the steering arm 44. The other bottom opening 33 also serves as a mounting portion for a lower bearing 48d for pivoting the arm support shaft 45.

A spline which engages with a spline formed on the inner peripheral side of the sector gear 46 is formed on the outer peripheral surface of the upper side of the portion of the arm support shaft 45 pivoted to the lower bearing 48d, and the sector gear 46 is attached to be capable of being inserted into and removed from the arm support shaft 45, and integrally rotated.

The sector gear 46 is engaged with the pinion gear 42 of the steering rotation shaft 41, and the sector gear 46 is rotationally operated in accordance with the rotation of the steering rotation shaft 41. The steering arm 44 swings in a predetermined angle range through the arm support shaft 45 in accordance with the rotation of the sector gear 46.

The tie rod 47 connected to the free end of the steering arm 44 is linked to an articulated arm, not shown, and the left and right

front wheels

11F, 11F are steered according to the amount of swing motion of the steering arm 44.

The steering rotation shaft 41 is pivoted by an upper bearing 43u not only at a shaft portion extending downward toward a portion where the pinion gear 42 exists but also at an upper side of the pinion gear 42. The arm support shaft 45 is also pivoted by an upper bearing 48u on the upper side of the portion where the sector gear 46 exists.

As shown in fig. 9, 11, and 13 to 15, a traveling output shaft 74 and a planting output shaft 92 extend rearward from the rear wall 30r of the transmission case 3.

The second shift gear 68 constituting the 2 nd sub-transmission mechanism 60B is spline-fitted to the third transmission shaft 67 that supports the first bevel gear 70 that transmits driving force to the second bevel gear 75 for input of the traveling output shaft 74. As shown in fig. 16, the second shift gear 68 is shifted by the operating lever 79 for the sub-shift operation. That is, the shift 79a of the operating lever 79 engages with the second shift gear 68 to push and pull the shift lever in the axial direction, whereby the 2 nd sub-transmission mechanism 60B can be shifted in height.

The operating lever 79 for the sub-shift operation is shown in fig. 16, but the actual positional relationship is arranged in close proximity to the right lower side of the fourth bevel gear 91 attached to the input side end of the planting output shaft 92, as shown in fig. 15.

The distance between the operating lever 79 for the sub-shift operation and the fourth bevel gear 91 is a slight gap which is set so as to maintain the state of engagement with the third bevel gear 88 on the transmission upstream side, in a state in which the fourth bevel gear 91 is attached to the planting output shaft 92, in a state in which the fourth bevel gear 91 is kept away from the operating lever 79 for the sub-shift operation, and in a state in which the planting output shaft 92 is pulled out from the fourth bevel gear 91, the operating lever 79 for the sub-shift operation receives the fourth bevel gear 91 from below.

Thus, the operating lever 79 for the sub-shift operation functions as a receiving member that receives the fourth bevel gear 91 when the planting output shaft 92 is pulled out.

As shown in fig. 9, 17, and 18, the operating shaft 94 for switching the planting clutch 93 between the engaged state and the disengaged state is configured to be pushed and pulled by a crank-shaped operating member 99, and the crank-shaped operating member 99 is swingably provided to the lid-shaped case portion 31 of the transmission case 3 around the vertical axis y 1.

As shown in fig. 18 (a), the operation member 99 is formed in a crank shape in a plan view as shown in fig. 18 (b) by bending a stamping member of a flat plate material and connecting the stamping member with a connecting pin 99 a. One end side of the crank is engaged with the operation shaft 94, and the other end side is connected to a not-shown clutch lever provided near the driver seat 12, and the operation shaft 94 is pushed and pulled by an on-off operation of the clutch lever to perform an on-off operation of the clutch 93.

[ construction of brake operating System ]

As shown in fig. 13 and 16, a brake 78 for applying rotational resistance to the traveling output shaft 74 and braking the traveling body 1 is incorporated in the rear portion of the transmission case 3. The brake operating mechanism 5 that applies braking force to the brake 78 by manual operation is provided on the transmission 3 and the right side portion of the machine frame 10 on which the transmission 3 is disposed.

As shown in fig. 4, 5 and 10, the brake operating mechanism 5 includes: a brake pedal 50; a support shaft 51 for supporting the brake pedal 50 to be swingable; a brake operating shaft 52; and a connection mechanism 53 for interlocking the support shaft 51 and the brake operating shaft 52.

As shown in fig. 4, 5 and 10, the brake pedal 50 has a tread surface 50a that can be operated by foot. The connection portion between the tread surface 50a and the support shaft 51 includes: a front support bar 50b (corresponding to a pedal support bar) from the support shaft 51 to the tread surface 50 a; a rear support bar 50c (corresponding to a pedal support bar) extending from the support shaft 51 to the opposite side of the front support bar 50 b; a cylindrical portion 50d externally fitted to the support shaft 51; and an operation arm 50e integrally formed at an end portion of the cylindrical portion 50d on the inner side of the body and extending rearward.

Further, by fixing the front support rod 50b and the rear support rod 50c to the tubular portion 50d and connecting the end portion of the rear support rod 50c to the extending end side of the operation arm 50e, a frame-like mounting portion is formed at the peripheral portion of the support shaft 51 having the swing axis x3, which pivotally supports the brake pedal 50 so as to be swingable, and the mounting strength of the brake pedal 50 is improved.

A flat plate-like connection plate 50f is provided at a portion where the front support bar 50b and the rear support bar 50c are fixed to the cylindrical portion 50 d.

That is, the front support rod 50b and the rear support rod 50c, which are part of the brake pedal 50, are formed of tubular members each having an arcuate peripheral surface in cross section, and the tubular portion 50d fitted externally to the support shaft 51 is also formed of tubular members each having an arcuate peripheral surface in cross section.

The axial directions of the front support bar 50b and the rear support bar 50c intersect with the axial direction of the cylindrical portion 50d externally fitted to the support shaft 51 in directions substantially orthogonal to each other. Therefore, the contact state is approximately the point contact state at the portion where the circular arc circumferential surfaces of the front support bar 50b and the rear support bar 50c intersect with the circular arc circumferential surface of the cylindrical portion 50 d.

In this contact portion, since the welding margin at the time of welding is extremely small, in the present invention, the front support bar 50b and the rear support bar 50c are brought into substantially line contact with the connection plate 50f, and the cylindrical portion 50d is also brought into substantially line contact with the connection plate 50f by providing the connection plate 50f in a state of being sandwiched by the contact portions. Thus, a sufficient welding length in the longitudinal direction of the front support bar 50b and the rear support bar 50c and the longitudinal direction of the tubular portion 50d can be ensured, and a desired connection strength can be easily ensured.

As shown in fig. 10 and 19, a flat reinforcing plate 50g is welded and fixed to the lower surface of the front support rod 50b and the arcuate outer peripheral surface of the cylindrical portion 50d of the brake pedal 50.

As shown in fig. 12, 19 and 20, the brake pedal 50 protrudes from the driver floor 14 through the insertion opening 14a formed in the driver floor 14, thereby protruding the tread surface 50a from the driver floor 14. The brake pedal 50 has a pivot point x4 below the driver floor 14, and the brake pedal 50 is maintained in a depressed brake position by the lock lever 59 having the hand grip 59a and the engagement portion 59b positioned above the driver floor 14.

That is, as shown in fig. 20 (a), in a state where the brake pedal 50 is not depressed, the tread surface 50a is positioned sufficiently higher than the height of the engagement portion 59b of the lock lever 59, and even if the lock lever 59 is swung around the swing fulcrum x4, it is not engaged with the shackle 50h of the brake pedal 50.

When the brake pedal 50 is operated by being depressed, as shown in fig. 20 (b), since the shackle 50h is lowered to a height corresponding to the movement locus of the engagement portion 59b of the lock lever 59, in this depressed state, if the lock lever 59 is pulled to the near side against the return spring 59c, the state in which the engagement portion 59b of the lock lever 59 is hooked on the shackle 50h of the brake pedal 50 can be maintained, and the state in which the brake pedal 50 is depressed can be maintained. When the brake pedal 50 is depressed slightly from this state, the engagement portion 59b of the lock lever 59 moves to a side away from the movement locus r of the shackle 50h of the brake pedal 50 by the action of the spring 59c, and thus the lock is released.

At this time, the intermediate portion 59d of the lock lever 59, which corresponds to the insertion portion of the driver floor 14 into the insertion opening 14a, is formed by buckling rearward. This is because, when the lock lever 59 is formed along the straight line L1 of the connector swing fulcrum x4 and the hand grip 59a, the insertion opening 14a is prevented from being lengthened in the front-rear direction to form the swing range of the linear lock lever 59.

As shown in fig. 10 and 12, the lock lever 59 is also formed to flex in the left-right direction in a state in which the hand grip portion 59a of the intermediate portion 59d is located on the right lateral outer side of the body. This facilitates the formation of the insertion opening 14a on the back side of the power portion 13, and most of the brake pedal 50 and the lock lever 59 are hidden on the rear side of the power portion 13, ensuring a good state of appearance on the front side.

As shown in fig. 3 and 5, an operation body 110 for positioning the brake pedal 50 at a predetermined depression release position is provided at an end portion of the brake pedal 50 on the opposite side of the right lateral side of the machine body where the brake pedal 50 is provided, with respect to a support shaft 51 that supports the brake pedal 50 to be swingable.

As shown in fig. 3, the operating body 110 is formed in a substantially triangular shape when seen from the side, and the front end side of the operating body 110 is brought into contact with the stopper portion 10Ba formed by the front wall of the 1 st support bracket 10B, whereby the brake pedal 50 is positioned at a predetermined depression release position.

That is, the position where the tip end side of the operating body 110 fixed to the support shaft 51 biased to the return side by the return spring 56 is in contact with the stopper portion 10Ba constituted by the front wall of the 1 st support bracket 10B is positioned at the predetermined depression release position of the brake pedal 50.

The rear end side of the operating body 110 serves as a contact portion 110a with respect to the safety switch 111 for detecting that the brake pedal 50 is in a depressed state. That is, when the brake pedal 50 is operated by being depressed, the contact portion 110a of the operating body 110 depresses the safety switch 111, and the brake pedal 50 is detected to be operated by being depressed.

As described above, each portion of the single operating body 110 is used for a portion that abuts against the stopper 10Ba and a portion that abuts against the safety switch 111, thereby reducing the number of parts and miniaturizing the device.

As shown in fig. 3 to 5, a support shaft 51 that pivotally supports the brake pedal 50 is rotatably attached to a pair of front and

rear frames

10A, 10A that constitute the left and right machine frame 10. The cylindrical portion 50d is fitted to the right outer end of the support shaft 51, and is connected to rotate integrally with a connection support, not shown.

As shown in fig. 3 to 5 and 10, an arm 51a that rotates integrally with the support shaft 51 is provided on the support shaft 51 so as to face vertically at a middle position in the lateral direction. A return spring 56 is suspended between the free end of the arm 51a and the locking piece 10d fixed to the front and rear frames 10A, and returns to the original position after the brake pedal 50 is depressed.

As shown in fig. 5 and 16, one end side of the brake operating shaft 52 is supported in an inserted state in a support hole 39 provided in the rear portion of the transmission case 3, and a connecting arm portion 52a is integrally welded and fixed to the other end side exposed from the support hole 39.

A pressing operation portion 54 is formed on one end side of the support hole 39 inserted into the brake operation shaft 52, and the pressing operation portion 54 contacts a disk-shaped pressing body 78a of the brake 78 and presses the pressing body 78a to the friction plate 78 side, thereby applying the brake to the traveling output shaft 74.

As shown in fig. 16, the pressing operation portion 54 is configured such that an outer peripheral portion of the brake operation shaft 52 having a circular rod shape is cut into an L-shape in a range corresponding to approximately 1/4 of a circumference, and a groove-shaped portion cut into two

surfaces

54a, 54b in an axial direction and having approximately orthogonal directions is provided in the outer peripheral portion of the brake operation shaft 52.

Thus, the one surface 54b of the groove-shaped portion having the two

surfaces

54a, 54b in the substantially orthogonal direction is brought into contact with the rear surface side of the disk-shaped pressing body 78a of the stopper 78, and the brake 52 is rotated, whereby the one surface 54b of the groove-shaped portion presses the rear surface side of the pressing body 78a to the front side, thereby exerting a braking action.

The pressing operation portion 54 is formed by cutting off the outer peripheral portion of the brake operation shaft 52 having a circular rod shape. Therefore, the cross-sectional diameter of the brake operating shaft 52 in the portion where the pressing operation portion 54 is formed is within the range of the outer diameter of the round rod portion of the brake operating shaft 52. That is, the pressing operation portion 54 is present in a range of an axial cross-sectional area of a portion of the brake operation shaft 52 penetrating the wall of the transmission 3 when viewed in the axial direction of the brake operation shaft 52.

Therefore, when the brake operating shaft 52 is moved in the insertion/extraction direction with respect to the support hole 39, the insertion/extraction can be performed without performing a disassembly operation or the like of the traveling output shaft 74 and the brake 78.

As shown in fig. 4, 5 and 10, the free end of the connecting arm portion 52a provided on the other end side of the brake operating shaft 52 is connected to the operating arm 50e via a connecting rod 55 having a turnbuckle 55a in the middle, and the operating arm 50e extends rearward from the cylindrical portion 50d of the brake pedal 50.

Thus, when the brake pedal 50 is depressed, the rear support lever 50c rotates the operation arm 50e about the pivot axis x3 of the support shaft 51, and lifts the operation arm upward. Accordingly, the connecting lever 55 rotates the free end of the connecting arm 52a around the axial center of the brake operating shaft 52 to lift it upward. At this time, in the pressing operation portion 54 of the brake operation shaft 52, the one surface 54b of the groove-shaped portion that is in contact with the rear surface side of the pressing body 78a of the brake 78 rotates so as to press the pressing body 78a to the side where the friction plate 78b is present, presses the friction plate 78b of the brake 78, and the braking force is applied to the traveling output shaft 74. When the depression of the brake pedal 50 is released, the return spring 56 swings the brake pedal 50 to return, the brake operating shaft 52 connected to the connecting rod 55 also rotates in the opposite direction to the side where the one surface 54b of the pressing operation portion 54 is away from the rear surface side of the pressing body 78a of the brake 78, and the braking of the traveling output shaft 74 is released.

The connection mechanism 53 is constituted by: an operation arm 50e extending from the cylindrical portion 50d of the brake pedal 50; a connection arm portion 52a provided on the other end side of the brake operating shaft 52; and a link 55 that links the operation arm 50e and the connection arm 52 a.

[ Universal joint housing ]

As shown in fig. 3, 4, 7, and 8, the traveling output shaft 74 and the input shaft 19a of the rear axle box 19 are connected to each other so as to transmit driving force via the rear propeller shaft 77. The traveling output shaft 74 and the rear propeller shaft 77, and the rear propeller shaft 77 and the input shaft 19a of the rear axle box 19 are connected by universal joints 120, respectively.

The respective universal joints 120 have joint housings 121, and the universal joints 120 are entirely covered with the joint housings 121.

Each joint cover 121 is formed of a flexible tube formed in a bellows shape, and the flexible tube has a peak portion and a valley portion in a cylindrical peripheral portion, but a flat portion 122 may be formed in a part of the flexible tube, and the grease nipple 123 may be fixed in a state of penetrating the flat portion 122 inward and outward.

That is, the joint cover 121 has a part having peaks and valleys without wrinkles on the entire circumference in the circumferential direction as a part of the flat portion 122 in the longitudinal direction of the flexible tube, and a partial cylindrical portion is formed, and the grease nipple 123 is fixed in a state of penetrating the cylindrical portion inside and outside.

In the structure in which the grease nipple 123 is attached to the universal joint 120 by tightening, as shown in fig. 8, a washer 124 is fixed in a state of being interposed between the grease nipple 123 and the flat portion 122 of the joint housing 121 at a portion connecting the forward output shaft 74 and the rear propeller shaft 77.

The joint cover 121 is attached to a portion connecting the rear propeller shaft 77 on the rear side and the input shaft 19a of the rear axle housing 19 in such a manner that the head portion of the inlet port having the grease nipple 123 is exposed from the small hole 122a formed in the flat portion 122.

[ others ]

As shown in fig. 9 and 12, an opening 13b is formed in a power unit housing 13a on the rear side of the power unit 13 above a driver floor 14 on the front side of the driver seat 12, and a sub-shift lever 18 extends rearward from the opening 13 b.

The sub-shift lever 18 is an operation lever for shifting the first shift gear 64 of the 1 st sub-shift mechanism 60A in a high-low direction, and as shown in fig. 9, is rotatably supported on an upper portion side of an upper operation shaft 18a having a hand grip portion in a notch portion provided in a support plate 15b of the steering operation shaft 15 a. The transmission case further includes a lower operating shaft 18b protruding upward from the inside of the transmission case 3, and the upper operating shaft 18a and the lower operating shaft 18b are configured to be connectable and disconnectable by a joint member 18c provided at a lower end portion of the upper operating shaft 18 a.

Therefore, in the case of performing seal replacement of the protruding portion of the lower operating shaft 18b from the transmission case 3, the upper operating shaft 18a and the joint member 18c are removed in advance, and maintenance work such as seal replacement is facilitated.

Further, since the 1 st sub-transmission mechanism 60A needs to be operated in a case where the field is extremely deep, particularly in a case where a large torque output is required to be output, but its frequency of use is extremely low, the 1 st sub-transmission mechanism 60A is disposed at a rear lower position of the power unit 13 which is slightly inferior in operability but is difficult to be an obstacle.

Embodiment 1

In the above-described embodiment, the universal joint 120 is provided in the middle of the traveling output shaft 74 as the power transmission shaft, and the joint housing 121 covering the universal joint 120 is provided, but the joint housing 125 may be used for a connection portion provided with the pipe joint 127, and the pipe joint 127 may connect the power transmission shafts without the universal joint 120 to each other.

In this case, as shown in fig. 21, the grease nipple 123 may be attached to the cylindrical flat portion 126 of the flexible tube having a bellows shape.

This structure is not a support structure in which the rear axle box 19 is connected to the body frame 10 via the lower link 35, the upper link 36, and the cross bar 38, and is supported by a support structure in the form of a five-link suspension, which is capable of being rotated up and down, as in the embodiment, using a suspension spring 37, but is adapted to a support structure that is rotatable only about an axis in the front-rear direction with respect to the body frame 10.

Other structures may also be employed as in the above embodiments.

Embodiment 2

In the above embodiment, the structure in which the cylindrical flat portion 122 is formed on the joint housing 121 is exemplified, but not limited thereto.

For example, the flat portion 122 is not limited to the entire circumferential area, and may be provided only on a part of the circumferential area so as to sufficiently mount the grease nipple 123, the gasket, and the like.

The flat portion 122 includes a completely flat surface, but may be a surface formed of a single curved surface such as a cylinder or a toric surface such as a gentle spherical surface, as in the embodiment, and it is important that the flat surface is flat to the following extent: when the grease nipple 123, the gasket, and the like are attached, a gap is prevented from being generated at the nip portion between the grease nipple 123 and the gasket, and the like, by deforming the surface shape of the joint cover 121.

Other structures may also be employed as in the above embodiments.

Embodiment 3

In the above-described embodiment, the operating lever 79 for the sub-shift operation is used as a means for maintaining the posture of the fourth bevel gear 91 attached to the planting output shaft 92 to the extent of maintaining the engaged state with the third bevel gear 88 on the transmission upstream side even in the state where the planting output shaft 92 is pulled out, but is not limited thereto.

For example, the shift lever 79 may be configured by a separate shaft disposed in the transmission 3, or a dedicated shaft may be provided.

A dedicated receiving portion for receiving the fourth bevel gear 91 may be formed on the inner wall of the transmission case 3.

Embodiment 4

In the above-described embodiment, the structure in which the brake support shaft 51 and the brake operating shaft 52 are separately configured has been described, but a structure in which one shaft body is used for both the brake support shaft 51 and the brake operating shaft 52 may be employed.

Other structures may also be employed as in the above embodiments.

[ Industrial Applicability ]

The working machine to which the present invention is applied is not limited to a riding type rice transplanter, but may be a riding type direct seeding machine, and may be a variety of agricultural machines such as a tractor, a mower, and the like, as well as a working machine that performs work in a paddy field.

Claims

1. A working machine is characterized in that,

the rear axle box can be supported on the frame of the travelling machine body in an up-and-down swinging manner through a link mechanism,

the link mechanism has a link member connecting the body frame side and the rear axle box side,

a support bracket for supporting the front end of the link member is continuously provided on the machine frame,

The work machine includes:

a brake pedal provided on a floor of a driving part of the traveling body;

a safety switch for detecting a state in which the brake pedal is depressed; and

an operation body which is interlocked with the support shaft of the brake pedal and is abutted with the stop part at the pedal release position of the brake pedal to position the brake pedal at a prescribed position,

the support bracket has a stopper portion which abuts against the operating body in a state where the brake pedal is released from being depressed,

the safety switch is configured to detect a depressed state of the brake pedal by abutment with the operating body in response to an operation of the depressed side of the brake pedal,

the portion of the operating body which is in contact with the stopper and the portion of the operating body which is in contact with the safety switch are formed at different positions,

the brake pedal has an elongated pedal support rod whose axial direction is in a direction orthogonal to a support shaft for operating the brake and which has a tread surface at a position apart from the support shaft,

a plate-shaped reinforcing plate which is positioned in a direction crossing the support shaft and along the length direction of the pedal support rod is welded and fixed on the outer surface of the support shaft and the lower surface of the pedal support rod,

A pedal support rod through which a brake pedal is inserted through an insertion opening formed in a floor of a driving part of the traveling body, and,

the driver floor on the front side of the brake pedal is provided with a lock lever that engages with the brake pedal to be depressed, thereby preventing the brake pedal to be returned to the depressed side by force from being moved to the return side,

the lock lever is disposed so as to protrude from a lower surface side to an upper surface side of the driver floor through the insertion opening formed in the driver floor, has a swing fulcrum on a front side of a front end of the insertion opening, and is bent so that an engagement portion with a brake pedal is positioned on a front side of a front end of the insertion opening, and is configured so as to be swingably operated around the swing fulcrum to a side with which the brake pedal is engaged and a side with which the engagement is released.

2. A working machine is characterized in that,

the work machine includes:

a brake pedal provided on a floor of a driving part of the traveling body;

A plate-shaped reinforcing plate is welded and fixed to the outer surface of the support shaft and the lower surface of the pedal support rod in a direction intersecting the support shaft and extending in the longitudinal direction of the pedal support rod.

3. A working machine is characterized in that,

the work machine includes:

a brake pedal provided on a floor of a driving part of the traveling body;

The portion of the operating body that contacts the stopper and the portion that contacts the safety switch are formed at different positions.

4. A working machine is characterized in that,

the device comprises: a brake pedal provided on a floor of a driving part of the traveling body;

the safety switch is configured to detect a depression state of the brake pedal by contact with the operating body in response to an operation of the depression side of the brake pedal,

5. A working machine is characterized in that,

The safety switch is configured to detect a depressed state of the brake pedal by contact with the operating body in response to a depression-side operation of the brake pedal.