JP5233048B2 - Agricultural transporter - Google Patents

Description

  The present invention relates to an agricultural transport vehicle, and more particularly to a self-propelled agricultural transport vehicle that can easily switch between forward and backward travel.

  An agricultural transport vehicle has a loading platform attached to a vehicle body, and is used for transporting harvested items, farm tools, and the like in a field. Agricultural transport vehicles include a self-propelled vehicle that is self-propelled by mounting an engine on a vehicle body and driving crawlers disposed on the left and right sides of the vehicle by power from the engine.

  When switching forward and backward in a self-propelled agricultural transporter, it is necessary to operate a transmission that transmits power from the engine to the crawler. When switching between forward and backward travel, the operator first operates the clutch lever to release the connection between the transmission and the crawler in the clutch disposed between the transmission and the crawler. Next, the operator changes the meshing of the gear disposed in the transmission by operating the forward / reverse switching lever. Then, the operator again connects the transmission and the crawler by the clutch lever. As described above, the forward / reverse switching of the self-propelled agricultural transport vehicle is performed.

  Here, when performing the above-described operation, there may occur a phenomenon in which the gears in the transmission are not properly meshed or the meshing is disengaged again after the meshing is performed. In view of such a situation, Patent Literature 1 discloses a meshing state notification device that detects that meshing of gears in a transmission is not normally performed when switching between forward and backward traveling and issues an alarm. An agricultural transport vehicle (agricultural machinery) provided is disclosed.

JP 2004-69032 A

  However, in the agricultural transport vehicle disclosed in Patent Document 1, it is possible to detect that the gears in the transmission are not properly meshed by adopting the meshing state notification device. The above-described operation must be repeated until the gears are properly engaged. Therefore, this agricultural transport vehicle has a problem that the troublesomeness of the operator cannot be eliminated.

  The present invention has been made in view of the problems as described above, and provides an agricultural transport vehicle that can normally perform forward / reverse switching without repeating the forward / backward switching operation. For the purpose.

In order to achieve the above object, an agricultural transport vehicle according to claim 1 is a self-propelled agricultural transport vehicle using crawlers disposed on the left and right sides of a vehicle body, the support base provided with a stopper, With the lever rotation fulcrum fixed to the support base as a fulcrum, the forward stopper recess and the reverse stopper recess that can rotate within the range of the forward position to move forward and the reverse position to move backward and can come into contact with the stopper Is a forward / reverse switching lever provided at a substantially symmetrical position with the lever rotation fulcrum as a boundary, a liner having one end fixed to a mounting plate provided at a predetermined distance from the lever rotation fulcrum, A wire that is rotatably connected to a wire tip rotation fulcrum provided on the forward / reverse switching lever and biased to the other end side. And the forward / reverse switching lever has the wire tip rotation fulcrum positioned on a straight extension line connecting the mounting plate and the lever rotation fulcrum by the wire being biased to the other end side. specific position relative to said forward is held rotated and moved to the forward position be positioned in a position side, the held by rotational movement to the reverse position be positioned to the reverse position, said advancement stopper recess , When the forward / reverse switching lever is positioned at the forward position, the stopper is in contact with the stopper, and the reverse stopper recess is in contact with the stopper when the forward / backward switching lever is positioned at the reverse position. It is characterized by.

  According to a second aspect of the present invention, there is provided an agricultural transport vehicle that transmits either forward rotational force or reverse rotational force to a crawler disposed on the left and right of the agricultural transport vehicle. A shift unit connected to the other end of the wire so as to be rotatable between a forward rotation position for generating the forward rotational force in the transmission and a reverse rotational position for transmitting the reverse rotational force; A tension spring coupled to a shift portion to urge the wire toward the other end and to hold the shift portion in a forward rotation position when the forward / reverse switching lever is held in a forward position; And when the forward / reverse switching lever is in the reverse position, the wire is resisted against the urging force of the tension spring by being pulled out to one end side. Along with moving the one end, the shift unit is characterized in that it is held by the rotational movement to the reverse rotation position.

  The agricultural transport vehicle according to claim 3 is characterized in that the other end of the wire is connected to the shift portion via a second tension spring having a spring constant larger than that of the tension spring.

  In the agricultural transport vehicle according to claim 1, one end of the wire urged to the other end side is connected to the wire tip rotation fulcrum of the forward / reverse switching lever that is rotatably attached to the lever rotation fulcrum. . The wire is movably disposed in the liner, and one end of the liner is fixed to a mounting plate that is separated from the lever rotation fulcrum by a predetermined distance. Thereby, when the forward / reverse switching lever is positioned on the advance position side where the agricultural transport vehicle is advanced from the specific position where the wire tip rotation fulcrum is positioned on the extension line between the mounting plate and the lever rotation fulcrum, It is held at the forward position by the urging force to the other end side of the liner, and is held at the reverse position by the urging force to the other end side of the same liner when it is positioned at the reverse position to be moved backward. As a result, in this agricultural transport vehicle, the operator can normally mesh the gears in the transmission without repeating the operation of setting the forward / reverse switching lever to the forward position or the reverse position. Can be eliminated.

  The agricultural transport vehicle according to claim 2 is disposed in the transmission, and is configured to be capable of rotational movement between a forward rotation position that generates forward rotational force and an update rotational position that generates reverse rotational force. A shift unit is provided. The shift portion is connected to the other end of the wire and to a tension spring. The tension spring biases the wire to the other end side by the biasing force, and holds the shift portion at the forward rotation position when the forward / reverse switching lever is held at the forward position. In addition, when the forward / reverse switching lever is set to the reverse position, the agricultural transport vehicle pulls the shift portion to the pulling position by pulling the wire more on one end side than when the forward / backward switching lever is set to the forward position. The reverse rotation position is maintained against the biasing force of the spring. As described above, in the agricultural transport vehicle, even if the gear in the transmission is disengaged, the shift unit is held at the forward rotation position or the reverse rotation position according to the position at which the forward / reverse switching lever is held. Therefore, the gear is automatically meshed again automatically, and the safety of the operator can be improved.

  In the agricultural transport vehicle according to claim 3, since the other end of the wire and the shift portion are connected via a second tension spring having a spring constant larger than that of the tension spring, the forward / reverse switching lever is specified. Excessive pulling force toward one end side that occurs when the position is set can be absorbed by the extension of the second tension spring. Thereby, this agricultural transport vehicle can prevent that excessive force acts on a wire, a shift part, and a tension spring, and can prevent the failure.

The perspective view of the agricultural transport vehicle of embodiment of this invention. The side view at the time of setting a forward / reverse switching lever to a specific position. The side view at the time of setting a forward / reverse switching lever to a forward position. The side view at the time of setting a forward / reverse switching lever to a reverse position. Plane explanatory drawing of a transmission at the time of making a shift lever into a forward rotation position. The plane explanatory view of a transmission at the time of making a shift lever into a reverse rotation position.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The agricultural transport vehicle 1 of the present invention is used in a field or the like, and as shown in FIG. 1, a loading platform 3 on which a harvested product, farm tools, etc. are mounted is disposed in front of a vehicle body 2. Further, the agricultural transport vehicle 1 has an engine 4 and a transmission 5 mounted on the rear side of the vehicle body 2, and the crawlers 6 and 7 attached to the left and right of the vehicle body 2 are driven by power from the engine 4, It is self-propelled and self-propelled. The agricultural transport vehicle 1 is a vehicle in which an operator stands behind the vehicle body 2 and walks. The agricultural transport vehicle 1 includes a handle 8 for the operator to hold by hand, an engine 4 and a transmission. 5 for operating a clutch (not shown) disposed between the clutch lever 9 and the clutch lever 9 for releasing the clutch when pushed down, and a forward / reverse switching lever for switching the traveling direction of the agricultural transport vehicle 1. 10 is also attached.

  In the agricultural transport vehicle 1, as shown in FIG. 2, the agricultural transport vehicle 1 is moved forward by using a lever rotation fulcrum 11 that is rotatably fixed to a support base 17 attached to the vehicle body 2. A forward / reverse switching lever 10 is provided that can rotate a range between a forward position 10a to be moved and a reverse position 10b to be moved backward. As shown in FIG. 2, the forward / reverse switching lever 10 is composed of a main body 18 bent in a substantially S shape in side view and a resin material or the like attached to the tip of the main body 18. It is comprised by the handle | steering-wheel part 19 which is a part which a person holds. The main body 18 is attached to be rotatable around the lever rotation fulcrum 11 near one end of a substantially S-shape. Further, on the inner side of the S-shape of the main body 18, there are a forward stopper recess 21 and a backward stopper recess 22 that can come into contact with the stopper 20 provided on the support base 17 with the lever rotation fulcrum 11 as a boundary. It is provided at a symmetrical position. As shown in FIG. 3, the forward stopper recess 21 abuts against the stopper 20 when the forward / reverse switching lever 10 is positioned at the forward movement position 10a, and the forward / backward switching lever 10 rotates beyond the forward movement position 10a. To prevent that. Similarly, as shown in FIG. 4, the reverse stopper recess 22 abuts against the stopper 20 when the forward / reverse switching lever 10 is positioned at the reverse position 10 b, so that the forward / reverse switching lever 10 exceeds the reverse position 10 b. Prevents turning.

  A wire tip rotation fulcrum 12 to which one end 13 a of the wire 13 is rotatably connected is provided at a substantially central portion of the forward / reverse switching lever 10. The wire 13 is urged toward the other end 13b by a tension spring 32 shown in FIG. 5 described later, and is held movably in the liner 15. As shown in FIG. 2, the liner 15 is fixed to a mounting plate 14 provided on the vehicle body 2 at a predetermined distance from the lever rotation fulcrum 11, as shown in FIG. 2. In the forward / reverse switching lever 10, the wire tip rotation fulcrum 12 is positioned on the extended line 16 a of the straight line 16 connecting the lever rotation fulcrum 11 and the mounting plate 14 by the wire 13 being biased toward the other end 13 b. By being positioned on the forward position 10a side from the specific position 10c, it is automatically rotated and held at the forward position 10a. By being positioned on the reverse position 10b side, it is automatically rotated and held at the reverse position 10b. In the agricultural transport vehicle 1, it is not necessary for an unillustrated worker to repeat the operation of setting the forward / reverse switching lever 10 to the forward position 10a or the reverse position 10b.

  Since one end 13a of the wire 13 is rotatably attached to the wire tip rotation fulcrum 12, when the forward / reverse switching lever 10 is rotated in the range from the forward position 10a to the reverse position 10b, the wire 13 13 is prevented from being bent. Further, the wire 13 is based on the fact that the body portion 18 is configured so that the distance between the wire tip rotation fulcrum 12 and the mounting plate 14 is changed by turning the forward / reverse switching lever 10. The length drawn from one end 15a of the wire 13 to the one end 13a side of the wire 13 changes. Specifically, the length that the wire 13 is pulled out from the one end 15a of the liner 15 to the one end 13a side is as shown in FIG. 4 as compared to the case where the forward / reverse switching lever 10 is positioned at the forward position 10a as shown in FIG. As shown, the forward / reverse switching lever 10 is longer when it is positioned at the reverse position 10b. As a result, as shown in FIGS. 5 and 6, the other end 13b of the wire 13 is obtained when the forward / reverse switching lever 10 is positioned at the forward movement position 10a when the forward / reverse switching lever 10 is positioned at the reverse movement position 10b. In comparison with the above, the liner 15 moves toward the one end 13a by the difference in length drawn from the one end 15a to the one end 13a, and the length of the liner 15 from the other end 15b becomes shorter.

  As shown in FIG. 2, the clutch lever 9 is provided so as to protrude from the support base 17, and is configured to be rotatable within a predetermined range. The clutch lever 9 is connected to one end of a clutch wire 24 movably held in a liner 23 shown in FIG. 5 and one end of a clutch wire 26 movably held in a liner 25. The other end of the clutch wire 24 is connected to a clutch (not shown) disposed between the transmission 5 and the crawler 6, and the other end of the clutch wire 26 is connected between the transmission 5 and the crawler 7. It is connected to a clutch (not shown) arranged in the figure. Thus, when the clutch lever 9 is positioned at the normal position 9a (FIGS. 2 to 4), the transmission 5 and the crawlers 6 and 7 are connected to the clutch, and the clutch wires 24 and 26 are pushed down. Is pulled to one end side to release the connection between the transmission 5 and the crawlers 6 and 7 to the clutch, and the so-called clutch is disengaged.

  As shown in FIGS. 5 and 6, the transmission 5 is provided with a shift lever 28 that is a rotating shaft. The transmission 5 positions the shift lever 28 at the forward rotation position 29a, thereby changing the meshing of a gear (not shown) in the transmission 5 to move the power from the engine 4 in the direction of moving the agricultural transport vehicle 1 forward. It is converted into a rotational force that drives the crawlers 6 and 7, and is positioned at the reverse rotation position 29 b to similarly change the meshing of a gear (not shown) in the transmission 5 to transfer the power from the engine 4 for agricultural transportation. It is converted into a rotational force that drives the crawlers 6 and 7 in the direction of moving the vehicle 1 backward.

  A change head 27 which is a rotating arm is fixed to the shift lever 28, and the change head 27 is configured to be rotatable together with the shift lever 28. Hereinafter, the change head 27 and the shift lever 28 are collectively referred to as a shift unit 29.

  The shift portion 29 is provided with an attachment fulcrum 31 for attaching one end 32a of the tension spring 32 at a position close to the shift lever 28 side from the tip 30 thereof. The other end 32b of the tension spring 32 is provided in the vehicle body 2 and is attached to an attachment fulcrum 33 provided outside the forward rotation position 29a. The shift portion 29 is urged to rotate to the forward rotation position 29a. When the forward / reverse switching lever 10 is held at the forward movement position 10a, it is held at the forward rotation position 29a.

  In addition, the other end 13b of the wire 13 is connected to the tip 30 via a tension spring (second tension spring) 34, and the wire 13 is connected to the shift portion 29 described above at one end 32a. Is biased toward the other end 13b by the biasing force of the tension spring 32 to which is attached. Note that the tension spring 34 has an excess toward the one end 13a side of the wire 13 that occurs when the tension switch 34 is at the specific position 10c where the wire 13 is further pulled out to the one end 13a side, compared to the case where the forward / reverse switching lever 10 is located at the reverse position 10b. This is intended to absorb a large pulling force by stretching, prevent an excessive force from acting on the wire 13 and the shift portion 29, and prevent the failure.

  In the agricultural transport vehicle 1 described above, as shown in FIG. 3, when the forward / reverse switching lever 10 is set to the forward movement position 10 a, the shift portion 29 is caused by the urging force of the tension spring 32 as shown in FIG. 5. It is held at the forward rotation position 29a. As a result, the transmission 5 transmits the rotational force in the direction of moving the agricultural transport vehicle 1 forward to the crawler 6 and the crawler 7 via the clutch (not shown), so that the agricultural transport vehicle 1 is self-propelled in the forward direction. To do.

  Next, when switching from the state in which the agricultural transport vehicle 1 is self-propelled in the forward direction to self-propelled in the reverse direction, first, an unillustrated operator pushes down the clutch lever 9 shown in FIG. Thus, the clutch is operated, and the connection between the transmission 5, the crawler 6, and the crawler 7 is canceled. In this state, when the operator turns the forward / reverse switching lever 10 from the forward movement position 10a to the reverse movement position 10b, the forward / reverse switching lever 10 is moved by the biasing force of the tension spring 32 toward the other end 13b of the wire 13. The reverse position 10b is maintained. At this time, as shown in FIG. 4, the length of the wire 13 drawn from the one end 15a of the liner 15 toward the one end 13a is longer than that when the forward / reverse switching lever 10 is set to the forward position 10a (FIG. 3). . Thereby, as shown in FIG. 6, the length of the other end 13b of the wire 13 drawn out from the other end 15b of the liner 15 is longer than that when the forward / reverse switching lever 10 is set to the forward position 10a (FIG. 5). Shorter.

  In the above, based on the fact that the spring constant of the tension spring 34 is larger than that of the tension spring 32, as shown in FIG. 6, the tension spring 32 is extended and the shift portion 29 is rotated and held to the reverse rotation position 29b. In this state, the operator releases the clutch lever 9 and returns it to the normal position 9a, thereby operating the clutch and connecting the transmission 5, the crawler 6, and the crawler 7. As a result, the transmission 5 transmits the rotational force in the direction in which the agricultural transport vehicle 1 is moved backward to the crawler 6 and the crawler 7 via the clutch (not shown), so that the agricultural transport vehicle 1 is traveling in the reverse direction. To do.

  In addition, when switching from the state which made the agricultural transport vehicle 1 self-propelled in the said reverse direction so that it may self-propell in the advancing direction, an operator outside a figure must first push down the clutch lever 9 shown in FIG. By operating the clutch, the connection between the transmission 5, the crawler 6, and the crawler 7 is canceled. In this state, when the worker rotates the forward / reverse switching lever 10 from the reverse position 10b to the forward position 10a, the forward / reverse switching lever 10 is moved by the urging force of the tension spring 32 toward the other end 13b of the wire 13. It is held at the advanced position 10a. At this time, as shown in FIG. 3, the length of the wire 13 drawn from the one end 15a of the liner 15 toward the one end 13a is shorter than that when the forward / reverse switching lever 10 is set to the reverse position 10b (FIG. 4). . As a result, as shown in FIG. 5, the length of the other end 13b of the wire 13 drawn from the other end 15b of the liner 15 is longer than that when the forward / reverse switching lever 10 is set to the reverse position 10b (FIG. 6). become longer.

  In the above, as shown in FIG. 5, the tension spring 32 is contracted and the shift portion 29 is rotated and held to the forward rotation position 29a. In this state, the operator releases the clutch lever 9 and returns it to the normal position 9a, thereby operating the clutch and connecting the transmission 5, the crawler 6, and the crawler 7. As a result, the transmission 5 transmits the rotational force in the direction of moving the agricultural transport vehicle 1 forward to the crawler 6 and the crawler 7 via the clutch (not shown), so that the agricultural transport vehicle 1 is self-propelled in the forward direction. To do.

  As described above, the agricultural transport vehicle 1 is configured such that the forward / reverse switching lever 10 is configured so that the wire 13 having the one end 13a coupled to the forward / reverse switching lever 10 is biased toward the other end 13b. The forward position 10a or the reverse position 10b is held. Thereby, in the agricultural transport vehicle 1, the forward / reverse switching lever 10 can be held at the forward movement position 10a or the reverse movement position 10b, so that the normal engagement of the gear in the transmission 5 is performed by the operator. It is no longer necessary to repeat the operation of the forward / reverse switching lever 10, thereby eliminating the troublesomeness of the operator.

  In the agricultural transport vehicle 1, the shift portion 29 can be held at the forward rotation position 29 a or the reverse rotation position 29 b by the wire 13 and the tension spring 32, so that the gears in the transmission 5 can be engaged. Even when the gear is disengaged, the gear is automatically meshed again, so that the safety of the operator can be improved. Further, since a holding mechanism (not shown) for preventing the gears from being disengaged, which has been conventionally required in the transmission 5, can be eliminated, the structure of the transmission 5 is simplified and the cost is reduced. be able to.

  The configuration of the agricultural transport vehicle 1 shown in the present embodiment is only one aspect of the agricultural transport vehicle according to the present invention, and various modifications can be made without departing from the gist of the present invention. .

The agricultural transport vehicle according to the present invention can be used as a transport vehicle in a field.

DESCRIPTION OF SYMBOLS 1 Agricultural transport vehicle 10 Forward / reverse switching lever 10a Forward position 10b Reverse position 10c Specific position 11 Lever rotation fulcrum 12 Wire tip rotation fulcrum 13 Wire 13a One end 13b of wire 13 Other end 14 of wire 13 Mounting plate 15 Liner 15a one end

Claims (3)

A self-propelled agricultural transporter with crawlers arranged on the left and right of the vehicle body,
A support base provided with a stopper;
With a lever rotation fulcrum fixed to the support base as a fulcrum, it is rotatable within a range between a forward movement position to advance and a reverse movement position to move backward, and for a forward stopper recess and a backward stopper that can come into contact with the stopper A forward / reverse switching lever in which a recess is provided at a substantially symmetrical position with the lever rotation fulcrum as a boundary;
A liner fixed at one end to a mounting plate provided at a predetermined distance from the lever rotation fulcrum, and a wire tip rotation provided at the one end of the forward / reverse switching lever. A wire rotatably connected to the fulcrum and urged to the other end,
When the wire is biased to the other end, the forward / reverse switching lever is positioned at a specific position where the wire tip rotation fulcrum is located on a straight line extending between the mounting plate and the lever rotation fulcrum. On the other hand, it is rotated and held at the forward position by being positioned on the forward position side, and is rotated and held at the reverse position by being positioned on the reverse position side .
The forward stopper recess contacts the stopper when the forward / reverse switching lever is positioned at the forward position, and the reverse stopper recess is positioned when the forward / backward switching lever is positioned at the reverse position. An agricultural transport vehicle that abuts against the stopper . A transmission for transmitting either forward rotational force or backward rotational force to the crawlers disposed on the left and right of the vehicle body of the agricultural transport vehicle;
A shift disposed in the transmission and coupled to the other end of the wire so as to be rotatable between a forward rotational position for generating the forward rotational force in the transmission and a reverse rotational position for transmitting the backward rotational force. And
A tension spring coupled to the shift portion for urging the wire to the other end side, and holding the shift portion in the forward rotation position when the forward / reverse switching lever is held in the forward position; With
In the case where the forward / reverse switching lever is set to the reverse position, the wire is pulled out to one end side so that the wire moves to one end side against the urging force of the tension spring, and the shift is performed. The agricultural transport vehicle according to claim 1, wherein the portion is rotated and held in a reverse rotation position.   The agricultural transport vehicle according to claim 2, wherein the other end of the wire is connected to the shift portion via a second tension spring having a spring constant larger than that of the tension spring.

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