JP2014008054A - Self-propelled type working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-propelled type working vehicle for improving the operability that is obtained to link a lift lever and a PTO lever to be frequently used as a series of operations at a turning or backing time.SOLUTION: A tractor 10, in which a rotary tiller 40 is connected to the back thereof and which works by operating the rotary tiller 40 with a power from an engine E, comprises: a driver seat 27; a lift lever 31 for operating a working machine lifting mechanism 41 to move up and down the rotary tiller 40; and a PTO lever 32 capable of disconnecting the transmission of a power from an engine E to the rotary tiller 40. The lift lever 31 and the PTO lever 32 are arranged in parallel on any one of the left side and right side of the driver seat 27.

Description

  The present invention relates to a self-propelled work vehicle in which a work machine is connected to a rear portion and works by operating the work machine with power from an engine, and operates a driver's seat and an elevating means for raising and lowering the work machine. The present invention relates to a self-propelled work vehicle including a lift lever that performs cutting and a PTO lever that can cut off transmission of power from an engine to a work implement.

  A conventional self-propelled work vehicle has a work mechanism attached to the vehicle body via a link mechanism and a lifting device for lifting and lowering the working machine, a lift lever for operating the lifting device, and transmission of power from the engine to the working machine. Various operation levers such as a PTO lever capable of cutting the are arranged in the vicinity of the driver's seat.

JP 2000-262106 A

  The self-propelled work vehicle disclosed in Patent Document 1 improves the operability by arranging operation levers such as a PTO lever, an accelerator lever, an HST main speed change lever, and a work implement elevating lever on the right side from the center in the body width direction. I am letting. However, there has been a problem that the operation is difficult to understand because a plurality of operation levers, which are often used as a series of operations, are arranged. In addition, since various operation levers are individually installed, installation space is required in a narrow space and complicated installation is required, so that labor is required for assembly work and productivity is poor. Therefore, the present invention is often used as a series of operations during turning or reverse, and a lift lever that operates lifting means for lifting the work implement, and a PTO lever that can cut off the transmission of power from the engine to the work implement. It is intended to provide a self-propelled work vehicle that improves the operability linked to each other.

For this reason, the invention according to claim 1 is a self-propelled work vehicle that performs work by connecting a work machine to a rear part and operating the work machine with power from an engine,
In a self-propelled work vehicle comprising a driver's seat, a lift lever that operates lifting means for lifting and lowering the work implement, and a PTO lever capable of cutting off transmission of power from the engine to the work implement,
The lift lever and the PTO lever are arranged in parallel on either side of the driver's seat.

  According to a second aspect of the present invention, in the self-propelled work vehicle according to the first aspect, the lift lever and the PTO lever can be rotated in the front-rear direction of the airframe.

  According to a third aspect of the present invention, in the self-propelled work vehicle according to the second aspect, the PTO lever is arranged on the driver's seat side.

  According to a fourth aspect of the present invention, in the self-propelled work vehicle according to the third aspect, the upper end of the lift lever is located above the upper end of the PTO lever.

The invention according to claim 5 is the self-propelled work vehicle according to any one of claims 1 to 4, further comprising a main transmission lever for changing the traveling speed,
The main transmission lever, the lift lever, and the PTO lever are rotatably held by one holding means.

  According to the first aspect of the present invention, there is provided a self-propelled work vehicle in which a work machine is connected to a rear portion and the work machine is operated by power from an engine to perform work, the driver's seat, In a self-propelled work vehicle comprising a lift lever for operating a lifting means for lifting and lowering and a PTO lever capable of cutting off transmission of power from the engine to the work implement, the lift lever and the PTO lever are It is arranged in parallel on either the left or right side of the driver's seat.

  For this reason, when turning or reversing, the lift lever and the PTO lever used for a series of operations such as raising the work machine to stop the drive of the PTO shaft or starting the drive of the PTO shaft to lower the work machine are used. It is possible to operate with one hand while sitting in the driver's seat. Further, since the lift lever and the PTO lever used for the series of operations as described above are centrally arranged, the operability associated with the lift lever and the PTO lever is improved, and the workability is improved. Therefore, it is possible to provide a self-propelled work vehicle that improves the operability associated with the lift lever and the PTO lever, which is often used as a series of operations during turning and reverse travel.

  According to the second aspect of the present invention, the lift lever and the PTO lever can be moved in the front-rear direction of the machine body. Therefore, the operation of the hand operating the lift lever and the PTO lever is only in the front-rear direction. In addition, the operability of the PTO lever is improved and workability is improved.

  According to the third aspect of the present invention, since the PTO lever is disposed on the driver's seat side, when operating the PTO lever, the operating hand does not enter the operating range of the lift lever, and the lift lever is PTO. It does not interfere with the operation of the lever and can prevent the lift lever from being operated incorrectly.

  According to the invention described in claim 4, since the upper end of the lift lever is located above the upper end of the PTO lever, when operating the lift lever, the operating hand gets over the PTO lever and operates the lift lever. However, the PTO lever does not interfere with the operation of the lift lever, and the PTO lever can be prevented from being erroneously operated.

  According to the fifth aspect of the present invention, the main speed change lever for changing the traveling speed is provided, and the main speed change lever, the lift lever, and the PTO lever can be rotated by one holding means. Since it is held, the number of parts is reduced, and the assembly of the main transmission lever, the lift lever and the PTO lever can be facilitated by the assembly of the holding means, and the productivity is improved.

It is a perspective view of the tractor as an example of the self-propelled work vehicle of this invention. It is a side view of the state which connected the rotary cultivator as an example of a working machine to the tractor. It is a partial enlarged view of a driver's seat floor. It is a figure for demonstrating the attachment state of the main transmission lever, a lift lever, and a PTO lever. It is a figure for demonstrating the mechanism of a main transmission lever, a lift lever, and a PTO lever.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a tractor 10 as a self-propelled working vehicle of the present invention. The tractor 10 includes an engine E, a radiator, a cooling fan, an air cleaner, a battery, and the like in a bonnet 11. A front lamp 12 and a front grill 13 for taking outside air into the engine are provided at the front of the bonnet 11. The engine E, the radiator, and the battery are placed on the chassis 14. In addition, front wheels 15 and 15 are provided on the front left and right of the aircraft, and rear wheels 16 and 16 are provided on the rear left and right. Fenders 17 and 17 are provided so as to cover the left and right rear wheels 16 from above and inside, respectively.

  A dashboard 18 is provided behind the hood 11 via an air cut plate. The dashboard 18 is provided with a panel for displaying speed, fuel remaining amount and the like. A steering column cover 20 is provided adjacent to the rear of the dashboard 18. A steering wheel 21 is protruded from the upper end of the steering column cover 20. On the upper surface of the steering column cover 20, a reverser lever 22 is provided on the left side of the steering 21, and an accelerator lever 23 is provided on the right side of the steering 21. Left and right brake pedals 24, 24 are provided on the lower right side of the steering column cover 20, and a clutch pedal 25 is provided on the lower left side of the steering column cover 20.

  A driver's seat 27 is provided behind the steering column cover 20 at a predetermined distance. The driver's seat 27 is disposed between the left and right fenders 17 and 17. The driver's seat 27 is attached on the driver's cab 28. A lift lever 31 and a PTO lever 32 are provided on the right side of the top surface of the cab 28. On the other hand, a sub-transmission lever 33 is provided on the top left side of the cab 28. Further, a main transmission lever 38 is provided on the right front side of the cab 28 and a 4WD lever 39 is provided on the left front side of the cab 28.

  A floor 34 is provided between the cab 28 and the hood 11. The floor 34 is used when the driver gets on and off the tractor 10 or puts his / her foot while driving. Below the floor 34, a transmission case TM having a built-in transmission is arranged. The transmission case TM is fixed to the rear part of the chassis 14. The power from the engine E is transmitted to the rear wheel 16 via the transmission.

  A fuel tank 36 is arranged adjacent to the rear of the driver's seat 27. The fuel tank 36 is disposed between the left and right fenders 17 and 17. At the rear ends of the left and right fenders 17, 17, ROPS (Roll-over protective structures) 37 is provided so as to project. The ROPS 37 is fixed to the axle case AC of the rear wheel 16. The axle case AC is fixed to the transmission case TM.

  As shown in FIG. 2, a well-known hydraulic working machine lifting mechanism 41 for lifting and lowering a rotary tiller 40 as a working machine is attached to the rear upper surface of the transmission case TM. Note that the working machine lifting mechanism 41 is not limited to a hydraulic type, and may be a mechanical type using a gear or the like as long as the rotary tiller 40 (working machine) can be raised and lowered.

  The rotary tiller 40 is connected to the rear part of the transmission case TM via a three-point link mechanism including a pair of left and right lower links 42 and 42 and a top link 43. The front end sides of the left and right lower links 42, 42 are rotatably connected to the left and right side surfaces of the rear portion of the transmission case TM. The front end side of the top link 43 is rotatably connected to the rear part of the working machine lifting mechanism 41. A PTO shaft 44 for transmitting driving force from the engine E to the rotary tiller 40 protrudes rearward on the rear side surface of the transmission case TM.

  The work machine elevating mechanism 41 is provided with a pair of left and right lift arms 45 and 45 that are rotated by an elevating hydraulic cylinder (not shown). The left and right lift arms 45, 45 are connected to the left and right lower links 42, 42 via left and right lift rods 46, 46. The left and right lift arms 45, 45 are configured to move the rotary tiller 40 up and down.

  Details of the arrangement structure of the lift lever 31 and the PTO lever 32 will be described with reference to FIG. The lift lever 31 and the PTO lever 32 are, for example, on the right side of the driver's seat 27 and are arranged in parallel in the left-right direction of the aircraft between the driver's seat 27 and the right fender 17. Further, the lift lever 31 and the PTO lever 32 can be rotated in the front-rear direction of the machine body. The PTO lever 32 is disposed closer to the driver's seat 27 than the lift lever 31. The rotation of the lift lever 31 and the PTO lever 32 is regulated by a lift lever guide 48 and a PTO lever guide 49 provided on the top surface of the lever guide box 47.

  As shown in FIGS. 4 and 5, the main transmission lever 38, the lift lever 31, and the PTO lever 32 are rotatably supported by a single lever support member 50 and are integrally configured. The lever support member 50 has, for example, a rectangular shape, and has fastening portions for assembling to the cab 28 on the front surface and the upper surface. Further, the main transmission lever 38, the lift lever 31, and the PTO lever 32 are rotatably supported on the right side surface via a contact member (not shown). Since the lever support member 50 is assembled to the cab 28 at the front and upper fastening portions, the lever support member 50 that receives a force when operating each operation lever can be firmly fixed to the cab 28. The lever support member may be any member that can rotatably support the main transmission lever 38, the lift lever 31, and the PTO lever 32 and can be assembled to the cab 28, and is not limited to the above-described configuration. Absent.

  The main transmission lever 38 includes a grip 54 at the upper end of the arm 51 and a rotation shaft 57 at the lower end of the arm 51. The rotation shaft 57 is provided perpendicular to the arm 51, and the tip of the rotation shaft 57 is rotatably attached to the lever support member 50 at a rotation fulcrum C1. The rotation shaft 57 includes a boss 60 perpendicular to the rotation shaft 57, and one end of a link bar 63 is rotatably attached to the tip of the boss 60.

  The lift lever 31 includes a grip portion 55 at the upper end of the arm 52 and a rotation shaft 58 at the lower end of the arm 52. The rotation shaft 58 is provided perpendicular to the arm 52, and the tip of the rotation shaft 58 is rotatably attached to the lever support member 50 at a rotation fulcrum C2. The rotation shaft 58 includes a boss 61 perpendicular to the rotation shaft 58, and one end of a link bar 64 is rotatably attached to the tip of the boss 61. Further, the grip portion 55 at the upper end of the lift lever 31 is positioned above the grip portion 56 at the upper end of the PTO lever 32.

  The PTO lever 32 includes a grip 56 at the upper end of the arm 53 and a rotation shaft 59 at the lower end of the arm 53. The rotation shaft 59 is provided perpendicular to the arm 53, and the tip of the rotation shaft 59 is rotatably attached to the lever support member 50 at a rotation fulcrum C3. The rotation shaft 59 includes a boss 62 perpendicular to the rotation shaft 59, and one end of a link bar 65 is rotatably attached to the tip of the boss 62.

  With this configuration, when the main speed change lever 38 is operated, the rotation shaft 57 rotates about the rotation fulcrum C1. As a result, the boss 60 also rotates about the rotation fulcrum C1, and the link bar 63 moves substantially in the vertical direction.

  This link bar 63 is connected to the transmission case TM via a link mechanism, and the amount of oil sent from the variable pump in the HST transmission mechanism to the hydraulic motor is changed by the movement of the link bar 63, and the output rotation from the hydraulic motor is changed. Change the speed.

  When the lift lever 31 is operated, the rotation shaft 58 rotates about the rotation fulcrum C2. As a result, the boss 61 also rotates about the rotation fulcrum C2, and the link bar 64 moves substantially in the front-rear direction.

  The link bar 64 is connected to the hydraulic work machine lifting device 41 via a link mechanism, and the hydraulic circuit is operated by operating the valve of the hydraulic work machine lifting device 41 by the movement of the link bar 64. , The left and right lift arms 45, 45 are moved, and the rotary tiller 40 is moved up and down.

  When the PTO lever 32 is operated, the rotation shaft 59 rotates about the rotation fulcrum C3. As a result, the boss 62 also rotates about the rotation fulcrum C3, and the link bar 65 moves substantially in the front-rear direction.

  The link bar 65 is connected to the transmission case TM via a link mechanism, and the hydraulic circuit is switched by operating the valve of the PTO clutch by moving the link bar 65, the PTO clutch is moved, and the PTO shaft is moved to the PTO shaft. Turn on / off the power transmission and change the rotation speed.

  As described above, the main transmission lever 38, the lift lever 31, and the PTO lever 32 are integrally configured to be rotatably supported by one lever support member 50, and the lever support member 50 is fastened to the cab 28. Then, by connecting the link bars 63, 64, 65 to each link mechanism, the main transmission lever 38, the lift lever 31, and the PTO lever 32 are assembled to the airframe. Therefore, since a plurality of operation levers can be assembled to the airframe at once, the assembling work is simplified. Note that the connection between each operation lever and each device is not limited to the above-described method, and may be, for example, a connection through a wire.

  Next, operations of the lift lever 31 and the PTO lever 32 configured as described above will be described. The lift lever 31 and the PTO lever 32 are often used as a series of operations when turning or reversing.

  When turning the airframe, the main transmission lever 38 is operated to decelerate, the lift lever 31 is operated to raise the rotary tiller 40, the PTO lever 32 is operated to stop driving the rotary tiller 40, and the steering Operate 21 to turn the aircraft. After turning, the PTO lever 32 is operated to start driving the rotary tiller 40, the lift lever 31 is operated to lower the rotary tiller 40, and the main transmission lever 38 is operated to accelerate.

  The operation levers used at this time are the main transmission lever 38, the lift lever 31, and the PTO lever 32, and the lift lever 31 and the PTO lever 32 operate continuously. Since these levers are centrally arranged on the right side of the driver's seat 27, the lever can be operated only with the right hand while sitting on the driver's seat 27. Further, since the lift lever 31 and the PTO lever 32 are arranged in parallel in the left-right direction of the machine body, the PTO lever 32 can be operated immediately after the lift lever 31 is operated.

  Further, since the operation of the lift lever 31 and the PTO lever 32 is the rotation of the airframe in the front-rear direction, the right-hand movement for operating each lever is the front-rear direction. The movement of the hand is easier to perform in the front-rear direction than in the left-right direction, and the force is easily transmitted, so the operability of the lift lever 31 and the PTO lever 32 is improved.

  Since the PTO lever 32 is disposed closer to the driver's seat 27 than the lift lever 31, when operating the PTO lever 32, the operating hand does not enter the operation range of the lift lever 31, and the lift lever 31. However, the operation of the PTO lever 32 is not disturbed, and the lift lever 31 can be prevented from being erroneously operated.

  On the other hand, when operating the lift lever 31, the operating hand gets over the operating range of the PTO lever 32 and operates the lift lever 31, but the gripping portion 55 at the upper end of the lift lever 31 is at the upper end of the PTO lever 32. Since it is located above the grip portion 56, the PTO lever 32 does not interfere with the operation of the lift lever 31, and it is possible to prevent the PTO lever 32 from being erroneously operated. Furthermore, the lift lever 31 and the PTO lever 32 are configured in different colors, so that each lever can be easily identified, and erroneous operation of each lever can be prevented.

  In the above-described example, the lift lever 31 and the PTO lever 32 are arranged on the right side of the driver's seat 27 in parallel in the left-right direction of the aircraft, and can be rotated in the front-rear direction of the aircraft. It is not limited to this. For example, the lift lever 31 and the PTO lever 32 may be arranged on the left side of the driver seat 27. Further, the lift lever 31 and the PTO lever 32 may be arranged in parallel in the longitudinal direction of the machine body so that the lift lever 31 and the PTO lever 32 can be rotated in the lateral direction of the machine body.

  The present invention is not limited to a tractor, and can be applied to a self-propelled working vehicle and any self-propelled vehicle.

10 Tractor (Self-propelled work vehicle)
27 Driver's seat 31 Lift lever 32 PTO lever 38 Main transmission lever 40 Rotary tiller (work machine)
41 Elevating mechanism for work implement (elevating means)
50 Lever support member (holding means)
E engine

Claims (5)

A self-propelled working vehicle that connects a work machine to the rear and operates the work machine with power from an engine,
In a self-propelled work vehicle comprising a driver's seat, a lift lever that operates lifting means for lifting and lowering the work implement, and a PTO lever capable of cutting off transmission of power from the engine to the work implement,
A self-propelled work vehicle, wherein the lift lever and the PTO lever are arranged in parallel on either side of the driver's seat.   The self-propelled work vehicle according to claim 1, wherein the lift lever and the PTO lever are rotatable in the front-rear direction of the airframe.   The self-propelled work vehicle according to claim 2, wherein the PTO lever is disposed on the driver's seat side.   The self-propelled work vehicle according to claim 3, wherein an upper end of the lift lever is positioned above an upper end of the PTO lever. It has a main gearshift lever for changing the running speed,
The self-propelled work vehicle according to any one of claims 1 to 4, wherein the main transmission lever, the lift lever, and the PTO lever are rotatably held by one holding means. .

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