WO2015147109A1

WO2015147109A1 - Agricultural vehicle

Info

Publication number: WO2015147109A1
Application number: PCT/JP2015/059260
Authority: WO
Inventors: 忠司近藤
Original assignee: ヤンマー株式会社
Priority date: 2014-03-27
Filing date: 2015-03-25
Publication date: 2015-10-01
Also published as: CN203840731U

Abstract

Provided is an agricultural vehicle in which it is possible to modify the maximum pressing amount of a speed change pedal with a simple and inexpensive configuration and to regulate running speed with ease. This agricultural vehicle is provided with a speed change pedal, which is provided on a vehicular frame and makes it possible to modify the running speed according to the rotation amount from being pressed, the agricultural vehicle additionally being provided with a pedal receiver protruding from the vehicular frame and having a first receiving portion that comes in contact with the speed change pedal on the upper surface thereof; a rotational member having one end rotatably supported by the pedal receiver so that the rotational member can be disposed in abutting contact position in which the rotational member can come into contact with the speed change pedal by protruding farther towards the speed change pedal than the first receiving portion, and in a non-contact position in which the rotational member is tilted towards the vehicular frame and away from the first receiving portion so as not to be able to come into contact with the speed change pedal, the rotational member having a second receiving portion that comes into contact with the speed change pedal when the rotational member is in the contact position; and an elastic member that is to be connected to the rotational member and the pedal receiver such that when the rotational member rotates from the non-contact position to the contact position, the elastic member crosses the fulcrum of the rotational member.

Description

Farm work vehicle

The present invention relates to a technique for regulating the traveling speed of an agricultural work vehicle.

2. Description of the Related Art Conventionally, farm vehicles in which a seeding device is provided at the rear part of a traveling body of a rice transplanter are known. The sowing work for sowing seeds in the field is performed at a lower speed than when traveling on the road or when planting seedlings in the field. In order to work at a low speed, that is, while maintaining an appropriate speed at the time of sowing work, it is difficult for the operator to work while keeping the depressing amount of the shift pedal that can change the traveling speed constant. there were.
Then, the technique which prevents the traveling speed at the time of a work from deviating from the appropriate speed at the time of a seeding operation | work by restrict | limiting a traveling speed is disclosed.

For example, Patent Document 1 discloses a rice transplanter provided with a maximum speed setting dial. In this rice transplanter, the control device calculates a target drive amount of a motor for changing the engine speed based on a pedal signal indicating the depression amount of the shift pedal. Then, the corrected target drive amount is calculated by correcting the target drive amount based on the dial signal based on the setting position of the maximum speed setting dial. The control device regulates the traveling speed by driving the motor so that the corrected target driving amount is obtained.

JP 2012-095574 A

In the rice transplanter of Patent Document 1, the maximum speed setting dial is provided on a dashboard or the like, and the structure for detecting the setting position of the maximum speed setting dial is provided, so that introduction of them is costly and existing It was not easy to install on the traveling aircraft.
Therefore, the present invention provides a farm vehicle that can easily and inexpensively change the maximum depression amount of the shift pedal and can easily regulate the traveling speed.

An agricultural work vehicle according to the present invention is an agricultural work vehicle that is provided on a vehicle body frame and includes a shift pedal that can change a traveling speed according to the amount of rotation caused by stepping on the agricultural vehicle. Provided with a pedal receiver having a first receiving portion that comes into contact with the shift pedal, a contact position that protrudes further toward the shift pedal than the first receiving portion and can come into contact with the shift pedal, and the first receiver One end of the pedal receiver is pivotally supported by the pedal receiver so that it can be disposed at a non-contact position that cannot tilt against the shift pedal by tilting toward the vehicle body frame relative to the portion. A rotating member having a second receiving portion that contacts the speed change pedal, and when the rotating member is rotated from a non-contact position to a contact position, so as to exceed a fulcrum of the rotating member; Comprising an elastic member connected to the receiving serial rotating member and the pedal, the.

The rotating member is provided with a bolt penetrating so that the head protrudes toward the speed change pedal at the abutting position and a nut for fixing the amount of protrusion of the head of the bolt relative to the rotating member. In addition, the second receiving portion is configured as a contact surface of the shift pedal at the head of the bolt.

According to the present invention, by configuring so that the maximum depression amount of the shift pedal can be changed, it is possible to easily realize a traveling speed suitable for traveling conditions such as farm field traveling and road traveling.

It is a side view of an agricultural work vehicle. It is a figure which shows the rotation member provided in the pedal receptacle provided in the front of a transmission pedal, and a pedal receptacle. (A) It is a figure which shows depression of the speed-change pedal in the contact position of a rotation member. (B) It is a figure which shows depression of the speed-change pedal in the non-contact position of a rotation member. It is a figure which shows the direction of the elastic force of the elastic member accompanying rotation of a rotation member. It is a figure which shows adjustment of the contact position of the 2nd receiving part provided in a rotation member. It is a top view which shows the balance weight provided in a step outward end.

The agricultural work vehicle 1 will be described with reference to the accompanying drawings.
The farm vehicle 1 is provided with a seeder at the rear part of a traveling machine body of a rice transplanter, and an operator performs a traveling operation while riding and performs a seeding operation for sowing seeds in a field.

The farm vehicle 1 includes a traveling machine body 2 and a seeding unit 3. The traveling machine body 2 includes a vehicle body frame 11 that is a main structure constituting the skeleton, a traveling unit 12 that travels the traveling machine body 2, and an elevating unit 13 that raises and lowers the seeding unit 3 relative to the traveling machine body 2.

In the traveling unit 12, the engine 21 is provided at the front portion of the vehicle body frame 11. The engine 21 is covered with a bonnet 22. In the traveling unit 12, the transmission case 23 is supported by the vehicle body frame 11 and is disposed below the engine 21.

In the traveling unit 12, a front wheel 25 is provided via a front axle case 24 provided on the left and right sides of the mission case 23, and a rear wheel 27 is provided via a rear axle case 26 provided behind the mission case 23.

That is, the power from the engine 21 is transmitted to the front axle case 24 and the rear axle case 26 via the transmission case 23, and the front wheels 25 and the rear wheels 27 are driven, so that the traveling machine body 2 can travel forward or backward. It becomes.

In the traveling unit 12, a driving operation device 31 is provided in the middle part of the vehicle body frame 11 before and after. In front of the driving operation device 31 of the traveling unit 12, an annular steering handle 32 for steering operation, a speed change pedal 33 that can change the traveling speed according to the amount of rotation by the stepping, and the steering handle 32 are added. A dashboard 34 on which various operating tools and display devices are arranged is arranged. At the rear of the driving operation device 31 of the traveling unit 12, the driver's seat 35 is disposed so as to be located behind the steering handle 32. Around the driver's seat 35, a step 36 used for getting on and off and replenishing seedlings is formed.

The shift pedal 33 is a step-on pedal that is operated by the operator's feet. The shift pedal 33 is arranged in a slanted shape with a front height, a rear height and a low height, and is rotatable in the pitching direction to the body frame 11 on the side of the bonnet 22 so that the front side can be turned with the rear end portion as a turning fulcrum. Supported. The shift pedal 33 is urged by a spring so that the low and high states are maintained.

When the shift pedal 33 is depressed, the potentiometer detects the amount of rotation of the shift pedal 33, and drives the continuously variable transmission for shifting the power from the engine 21 based on the detected value and the actuator for changing the transmission ratio of the continuously variable transmission. The travel speed can be changed.

The elevating unit 13 includes a pair of left and right upper links 41, a pair of left and right lower links 42, a rotating arm 43, and a hydraulic cylinder 44.

The pair of upper links 41 of the elevating unit 13 are provided in parallel to each other with an interval in the left-right direction. One end portion (front end portion) of the upper link 41 of the elevating unit 13 is supported by the rear portion of the vehicle body frame 11 so as to be rotatable in the vertical direction with the shaft member 45 as a fulcrum. The other end part (rear end part) of the upper link 41 of the elevating part 13 is attached to the front end part of the sowing part 3.

The pair of lower links 42 of the elevating unit 13 are provided in parallel to each other with an interval in the left-right direction. One end (front end) of the lower link 42 of the elevating part 13 is supported by the rear part of the vehicle body frame 11 so as to be rotatable in the vertical direction with the shaft member 46 as a fulcrum. The other end part (rear end part) of the lower link 42 of the elevating part 13 is attached to the front end part of the sowing part 3.

The rotary arm 43 of the elevating unit 13 is a rod-shaped member, and one end (lower end) thereof is fixed between a pair of left and right lower links 42.
The hydraulic cylinder 44 of the elevating unit 13 is an actuator for elevating the seeding unit 3 attached to the rear part of the vehicle body frame 11. One end of the hydraulic cylinder 44 of the elevating unit 13 is connected to the other end (upper end) of the rotating arm 43. The other end of the hydraulic cylinder 44 of the elevating unit 13 is connected to the vehicle body frame 11.

The elevating part 13 extends and lowers the seeding part 3 by rotating the rotating arm 43, the upper link 41, and the lower link 42 by extending and contracting the hydraulic cylinder 44.

The seeding unit 3 directly seeds paddy rice seeds in a paddy field with water, and includes a seeding frame, a float 51 attached to the seeding frame, a marker 52, a seeding device 53, and the like.

The float 51 of the seeding unit 3 includes a center float, a side float, and the like, and supports the seeding device 53 so as not to sink in the mud. The marker 52 of the sowing unit 3 is supported on the left and right sides of the sowing frame so as to be able to rotate up and down, and is used to place a mark on the rice field when seeding the next strip by turning around the headland.

The seeding device 53 is for seeding granular seeds, and includes a hopper 54 in which a plurality of granular seeds (granular materials) are accommodated, and a feeding device 55 for feeding out the seeds accommodated in the hopper 54. . Note that a plurality of seeding devices 53 are arranged in the left-right direction by the number of the strips.

The seeding device 53 is configured by disposing a feeding device 55 at the lower end of the hopper 54 and providing a cylinder at the lower end of the feeding device 55. The seeding device 53 is configured to discharge the seeds fed by the feeding device 55 from the opening at the lower end of the cylinder and sow the seeds.

As described above, the farm vehicle 1 performs the sowing work by the sowing unit 3 while traveling by driving the front wheels 25 and the rear wheels 27 with the power of the engine 21.

As shown in FIGS. 2 and 3, a pedal receiver 37 that contacts the shift pedal 33 is provided in front of the base end portion of the shift pedal 33 in the vehicle body frame 11.
The pedal receiver 37 protrudes upward from the vehicle body frame 11. The pedal receiver 37 has a hollow structure and includes a first receiving portion 38 that comes into contact with the transmission pedal on the upper surface thereof. The pedal receiver 37 has a shape obtained by cutting out a substantially triangular shape from one corner above the rear portion of the substantially rectangular shape in a side view, and the first receiving portion 38 (upper surface) is provided in an inclined shape with a front height and a low height.
By providing the pedal receiver 37, the maximum depression amount of the speed change pedal 33 is determined in advance. That is, the maximum depression amount of the shift pedal 33 is regulated by setting the contact position of the first receiving portion 38 in the shift pedal 33.

As shown in FIGS. 2 and 3, a contact position that protrudes toward the shift pedal 33 from the first receiving portion 38 and can contact the shift pedal 33, and a position closer to the vehicle body frame 11 than the first receiving portion 38. A pivot member 61 having one end pivotably supported by the pedal receiver 37 is provided so that the pedal receiver 37 can be disposed at a non-contact position that cannot be brought into contact with the speed change pedal 33 by being tilted.

The rotating member 61 is formed in a shape in which a substantially central portion in the longitudinal direction of the plate is bent. One end of the rotation member 61 is supported by a support shaft 62 provided so as to penetrate both side surfaces of the pedal receiver 37 so as to be rotatable in the pitching direction. The support shaft 62 is disposed in the upper and lower middle part of the pedal receiver 37 and in the rear part in a side view.
As described above, the rotation member 61 is rotatably supported by the support shaft 62, so that the rotation member 61 comes into contact with the upper surface (first receiving portion 38) of the pedal receiver 37 or the vehicle body frame 11. It is possible to rotate up to.

A second receiving portion 63 capable of contacting the speed change pedal 33 is provided at the protrusion of the speed rotation member 61 toward the speed change pedal 33, that is, in the present embodiment, the other end of the speed change member 61.
The second receiving portion 63 includes a bolt 64 and a nut 65 that are attached to the rotating member 61. At the other end (upper end) of the rotating member 61, a head 64 a of a bolt 64 protrudes toward the shift pedal 33 when protruding toward the shift pedal 33, and the bolt 64 is rotated by a nut 65. It is fixed to the member 61. That is, the contact surface of the second receiving portion 63 with the speed change pedal 33 is the head 64 a of the bolt 64.

A rod body 66 is fixed to the contact portion of the rotating member 61 with the pedal receiver 37, that is, the back surface on the side where the bolt 64 is disposed. Further, a rod body 67 is fixed to the front surface of the pedal receiver 37, that is, the opposite side of the speed change pedal 33.
The rod body 66 and the rod body 67 are arranged with the width direction of the traveling machine body 2 as the axial direction, and an elastic member 68 is provided at the same end thereof. The same end of the rod body 66 and the rod body 67 to which the elastic member 68 is connected is extended in the left and right direction from the pedal receiver 37 in a front view, so that the elastic member 68 is rotated with the rotation of the rotation member 61. Even if it moves, it is configured not to interfere. Further, a groove capable of locking the elastic member 68 is formed at the same end of the rod body 66 and the rod body 67, thereby preventing the elastic member 68 from coming off the rod body 66 and the rod body 67.

FIG. 3A shows a state in which the rotating member 61 is disposed at a contact position where it can contact the speed change pedal 33.
In this embodiment, the state in which the rotating member 61 protrudes toward the speed change pedal 33 from the first receiving portion 38 of the pedal receiver 37 means that the rotating member 61 is on the upper surface (first receiving portion 38) of the pedal receiver 37. Refers to the state of contact. In this state, when the shift pedal 33 is depressed, the second receiving portion 63 of the rotating member 61 comes into contact.

When the transmission pedal 33 and the second receiving portion 63 are in contact with each other, the maximum depression amount of the transmission pedal 33 can be reduced more than when the transmission pedal 33 and the first receiving portion 38 are in contact with each other. By reducing the maximum depression amount of the speed change pedal 33, the traveling speed of the agricultural work vehicle 1 can be regulated.

FIG. 3B shows a state in which the rotating member 61 is disposed at a non-contact position where it cannot contact the speed change pedal 33.
The state in which the rotating member 61 is tilted toward the vehicle body frame 11 with respect to the first receiving portion 38 of the pedal receiver 37 indicates a state in which the rotating member 61 is in contact with the vehicle body frame 11 in the present embodiment. In this state, when the shift pedal 33 is depressed, the first receiving portion 38 of the pedal receiver 37 comes into contact.

The first receiving portion 38 and the shift pedal 33 are brought into contact with each other, so that a predetermined amount of rotation (maximum amount) can be depressed.

As described above, the maximum depression amount of the shift pedal 33 can be changed in two steps. The first receiving portion 38 is set to contact the speed change pedal 33 when traveling on the road, and the second receiving portion 63 is set to contact the speed change pedal 33 at the time of direct sowing in the field. A suitable traveling speed can be set. That is, at the time of direct sowing in the field, by enabling low-speed traveling with the shift pedal 33 fully depressed, an appropriate traveling speed can be easily maintained, leading to improved workability.
Further, since the pedal receiver 37 is provided with the rotating member 61, the support shaft 62, the bolt 64, and the nut 65, the maximum depression amount of the speed change pedal 33 can be changed in two stages, and the number of parts is small. The travel speed can be regulated inexpensively.

As shown in FIG. 4, when the rotation member 61 is rotated from the non-contact position to the contact position, or from the contact position to the non-contact position, the fulcrum of the rotation member 61 is exceeded. An elastic member 68 is provided. When the elastic member 68 exceeds the fulcrum of the rotating member 61, the direction of the moment related to the rotating member 61 is opposite to the fulcrum.
Specifically, until the elastic member 68 exceeds the fulcrum from the non-contact position, the elastic force of the elastic member 68 acts in the direction in which the rotating member 61 rotates clockwise in the drawing. That is, the rotation member 61 is held at the non-contact position. On the contrary, from the time when the elastic member 68 passes over the fulcrum to the contact position, the elastic force of the elastic member 68 acts in the direction in which the rotating member 61 rotates counterclockwise around the fulcrum in the drawing. That is, the rotation member 61 is held at the contact position.

As described above, since the elastic member 68 is provided so as to exceed the rotation fulcrum according to the rotation of the rotation member 61, a simple change operation can be realized, and the rotation member 61 is reliably brought into the contact position. Alternatively, it can be held in a non-contact position.

As shown in FIG. 5, the contact position of the second receiving portion 63 with respect to the transmission pedal 33 can be changed by changing the protruding amount of the head portion 64 a of the bolt 64 with respect to the rotating member 61 by the nut 65.

The bolt 64 includes a head portion 64a and a shaft portion 64b in which a male screw is cut. The second receiving portion 63 in contact with the speed change pedal 33 in the head portion 64a preferably has a wide receiving surface and a gently curved surface.
By forming the receiving surface of the second receiving portion 63 to be wide and curved, the contact area between the transmission pedal 33 and the second receiving portion 63 is increased. Therefore, the pressure with respect to the contact surface of the 2nd receiving part 63 and the speed change pedal 33 can be disperse | distributed, and the wear of the speed change pedal 33 and the 2nd receiving part 63 can be reduced.

The fixing portion of the bolt 64 in the rotating member 61 is provided with a female screw that is screwed with the male screw of the shaft portion 64 b of the bolt 64. The male screw of the shaft portion 64 b of the bolt 64 is screwed onto the female screw of the rotating member 61, and the shaft portion 64 b protruding from the rotating member of the bolt 64 is fixed by the nut 65.
By changing the position where the bolt 64 is fixed by the nut 65, the protruding amount of the head 64 a of the bolt 64 with respect to the rotating member 61 is changed. By changing the protrusion amount of the head portion 64a of the bolt 64, the contact position between the shift pedal 33 and the second receiving portion 63, that is, the maximum depression amount of the shift pedal 33 can be further finely adjusted.
As described above, the maximum depression amount of the shift pedal 33 can be set with high accuracy by changing the position of the second receiving portion 63 with respect to the rotating member 61, so that traveling performance and work performance are improved.

Further, by making it possible to change the contact position of the second receiving portion 63 with respect to the speed change pedal 33, for example, when the field is hard, the contact position of the second receiving portion 63 is set to be low, When the farm field is soft, the traveling speed suitable for the farm field condition can be set by setting the contact position of the second receiving portion 63 to be higher.

In this embodiment, the pedal receiver 37 is provided with the first receiving portion 38 and the rotating member 61 is provided with the second receiving portion 63 so that the first receiving portion 38 and the second receiving portion 63 are switched to change the speed. The structure which changes the maximum depression amount of the pedal 33 is shown. For example, by providing a bolt and a nut capable of adjusting the position of the bolt head on the upper surface of the pedal receiver 37, a configuration corresponding to the first receiving portion 38 and the second receiving portion 63 can be realized.

As shown in FIGS. 1 and 6, balance weights 71 are provided at the outer ends (laterally outer sides) of the step 36 provided on the left and right sides of the bonnet 22 that houses the engine 21.
On the outer ends of the step 36 located on both the left and right sides of the bonnet 22, a preliminary seedling frame 72 is provided. The preliminary seedling frame 72 is a frame that supports the seedling table on which the seedling mat is placed, and is fixed to the vehicle body frame 11 positioned at the outer end of the step 36.

The preliminary seedling frame 72 includes a front frame 81 and a rear frame 82 that are arranged in the front-rear direction at the outer end of the step 36.
The front frame 81 extends vertically upward from the vehicle body frame 11 and then bends inward to form a single frame. The front frame 81 has a portal shape when viewed from the front.
The rear frame 82 has a shape that extends vertically upward from the vehicle body frame 11. A vertically upper halfway portion of the front frame 81 and an upper portion of the rear frame 82 are fixed by a middle frame 83.

The balance weight 71 can be provided in front of the traveling machine body 2 by fixing the weight case 73 that locks the balance weight 71 to the base of the front frame 81 and the base of the rear frame 82.

As described above, since the balance weight 71 is provided at the front part of the traveling machine body 2, the weight balance in the front-rear direction can be improved even if a heavy sowing part is attached to the rear part of the traveling machine body 2. Work performance and running performance are not impaired.

As shown in FIG. 6, the number of balance weights 71 provided at the outer ends (laterally outer sides) of step 36 can be changed.
One balance weight 71 is locked to the weight case 73 provided at the outer end (laterally outside) of the step 36 located on the speed change pedal 33 side. Two balance weights 71 are locked to a weight case 73 provided at the outer end (laterally outside) of the step 36 located on the opposite side to the speed change pedal 33 side.

In this way, by changing the number of balance weights 71 locked to the weight case 73, in addition to the weight balance in the front-rear direction, the weight balance in the left-right direction can be improved. Further, it is possible to prevent the running performance from being impaired.

The present invention can be used for a technique for regulating the traveling speed of a farm vehicle.

1: agricultural vehicle, 2: traveling machine body, 3: sowing part, 11: body frame, 33: shift pedal, 37: pedal receiver, 38: first receiving part, 61: rotating member, 63: second receiving part, 64: bolt, 65: nut, 68: elastic member, 71: balance weight

Claims

A farm vehicle equipped with a shift pedal that is provided on the vehicle body frame and that can change the traveling speed according to the amount of rotation by depressing,
A pedal receiver that protrudes from the vehicle body frame and has a first receiving portion that comes into contact with the shift pedal on an upper surface thereof;
A contact position that protrudes toward the shift pedal from the first receiving portion and can contact the shift pedal, and tilts toward the vehicle body frame from the first receiving portion and cannot contact the shift pedal. A rotating member having one end rotatably supported by the pedal receiver and a second receiving portion that contacts the speed change pedal at the contact position;
An elastic member connected to the rotating member and the pedal receiver so as to exceed the fulcrum of the rotating member when the rotating member is rotated from the non-contact position to the contact position;
A farm vehicle characterized by comprising.
The rotating member is provided with a bolt penetrating so that the head protrudes toward the speed change pedal at the abutting position and a nut for fixing the amount of protrusion of the head of the bolt relative to the rotating member. As well as
The agricultural work vehicle according to claim 1, wherein the second receiving portion is configured as a contact surface of the shift pedal at a head portion of the bolt.