JP6517576B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle provided with a bonnet, and more particularly to a bonnet locking mechanism.

  A working vehicle exemplified by a tractor is provided with a bonnet on which an engine or the like is mounted at the front of an airframe and which can be opened and closed so as to cover the engine. And, for example, a front part of the bonnet is provided with a locking mechanism for keeping the bonnet closed.

  According to Patent Document 1, a bonnet is formed by an openable / closable bonnet main body pivotally supported to a vehicle body at the rear upper part and a bonnet front lower part located at the front lower side and fixed to the vehicle body. Is lockable to the front of the vehicle body by locking means, and a lock stay is provided behind the lower front of the bonnet at the front of the vehicle body, and it is installed at the upper front of the bonnet by pivoting over the lock stay. There is provided a lock member engageable with an engaging tool, and a lock release member for rotating the lock member by forward and backward movement is provided. A bonnet locking device for a tractor is disclosed, characterized in that it projects.

  At the same time, efforts to reduce the burden on the global environment are considered urgent. There is no exception for tractors, and emission regulations are gradually tightened around the world. For this reason, tractors provided with an exhaust treatment device for purifying exhaust gas are provided one after another. More specifically, a diesel particulate filter (DPF) is attached to remove particulates including harmful substances in exhaust gas generated from a diesel engine. The DPF filters particulates. However, continued trapping of the exhaust gas will clog the filter and reduce its function. Therefore, the filter is regenerated by removing the particulates deposited on the filter. One way to regenerate the filter is to raise the temperature of the filter and burn the deposited particulates. The temperature of the filter at this time reaches several hundred degrees and becomes very high.

  According to Patent Document 2, in a diesel engine mounted and stored in an engine room of a work vehicle or the like, a muffler connected to the engine is disposed close to the upper side of the main body of the engine, and an oxidation catalyst and a diesel particulate filter are used for the muffler or There is disclosed a diesel engine characterized in that only a diesel particulate filter is provided.

Japanese Patent Application Publication No. 08-026140 JP 2008-031955 A

  By the way, in Europe, the certification required to sell agricultural vehicles, ie the rules for obtaining homologation, is strengthened. In the new rules, for example, the unlocking member of Patent Document 1 requires a cover as a key or a further releasing mechanism that requires another tool. However, there is an exception to the case where the unlocking member is attached to a floor or a place where a person such as a cabin gets in, and it is possible to immediately operate the unlocking member immediately. However, in the configuration of the diesel engine of Patent Document 2, a very high temperature diesel particulate filter is installed in the bonnet between the bonnet locking mechanism and the operation unit such as the cabin. Therefore, it is necessary to study the path from the locking mechanism to the unlocking member, the floor, and the mounting position of the unlocking member in a cabin or the like.

  Therefore, an object of the present invention is to provide a work vehicle provided with a bonnet locking mechanism which is less susceptible to heat and excellent in workability.

In order to solve the above problems, the present invention is configured so as to be openable and closable with respect to an airframe, and accommodates and covers an exhaust treatment device in any of the left and right directions of the airframe, and an operation unit behind the hood. In the work vehicle, the operation by the operation unit is transmitted to the lock mechanism between the lock mechanism for locking the bonnet, the operation unit for releasing the lock of the lock mechanism, and the lock mechanism and the operation unit. and a power transmitting member, said locking mechanism is provided on one of the front and rear direction of the machine body in the interior of the hood, the front SL operating unit, provided in the operation unit, the power transmission member, the The exhaust gas treatment device is characterized in that it is installed on the opposite side of the body on the left and right.

  Furthermore, the work vehicle includes a dashboard on the front side of the driving unit, and the operation unit is provided below the dashboard.

  Furthermore, the lock mechanism is a lock bar attached to any one side of the machine body and the bonnet, and is attached to the other side of the machine body and the bonnet, and has a fitting portion having a fitting portion with the lock bar. And a lock catch having a hook portion that is attached to the other side and that swings according to the movement of the power transmission member, and is attached between the machine body and the bonnet in a direction to open the bonnet A resilient member for biasing the bonnet against the biasing force of the resilient member so that the hook portion locks the lock bar when the lock bar is positioned in the fitting portion. The bonnet is configured to be locked.

  Further, the power transmission member is constituted by a wire.

  Furthermore, the wire is characterized in that the wire is fixed by a clamp to a plate installed on the left and right opposite sides of the airframe with the exhaust gas treatment device.

  Furthermore, the driving unit is configured by a cabin.

According to the present invention, in the work vehicle including the bonnet configured to be openable and closable with respect to the machine body, and housing and covering the exhaust treatment device in any of the left and right directions of the machine body and the driving unit behind the bonnet The lock mechanism includes a lock mechanism that locks, an operation unit that releases the lock of the lock mechanism, and a power transmission member that transmits an operation by the operation unit to the lock mechanism between the lock mechanism and the operation unit. provided in one of the longitudinal direction of the machine body inside, operation unit is provided in the operation unit, the power transmission member, since the exhaust treatment device is disposed on the opposite side in the left and right of the machine body, thermal effects Thus, it is possible to provide a work vehicle provided with a bonnet lock mechanism which is not easily received and which is excellent in workability.

  Furthermore, according to the construction provided with the dashboard on the front side of the drive unit and the operation unit provided below the dashboard, the work vehicle has a bonnet locking mechanism which is less susceptible to heat and excellent in workability. A work vehicle can be provided.

  Furthermore, the lock mechanism includes a lock bar attached to one side of the machine body and the bonnet, a fitting member attached to the other side of the machine body and the bonnet, having a fitting portion with the lock bar, and the other side. A lock catch having a hook portion pivoted in response to the movement of the power transmission member, and an elastic member attached between the machine body and the bonnet and biasing the bonnet in the opening direction, The bonnet is closed against the biasing force and the hook portion is configured to lock the lock bar by locking the lock bar when the lock bar is located at the fitting portion, so that the heat is affected. It is possible to provide a work vehicle provided with a bonnet lock mechanism which is difficult and excellent in workability.

  Furthermore, since the power transmission member is configured by the wire, it is possible to provide a work vehicle provided with a bonnet locking mechanism that is less susceptible to heat and is superior in workability.

  Furthermore, according to a configuration in which the wire is clamped to a plate installed on the left and right sides of the airframe with the exhaust treatment device, the bonnet locking mechanism is less susceptible to heat and excellent in workability. Can be provided.

  Furthermore, since the driving unit is configured by the cabin, it is possible to provide a work vehicle provided with a bonnet locking mechanism that is less susceptible to heat and is superior in workability.

BRIEF DESCRIPTION OF THE DRAWINGS It is the side view in which the form by which the rotary cultivating apparatus as an example of a working apparatus was mounted | worn with the tractor as an example of the working vehicle which concerns on this embodiment was shown. It is the top view with which the inside of a cabin and the outline of the circumference were illustrated. It is the side view in which the outline of composition in the inside of a bonnet was illustrated. It is the perspective view in which an example of the locking mechanism of a bonnet was shown. It is the front view in which an example in the state where the lock catch of a lock mechanism is not rocking is shown. It is the front view in which an example in the state where the lock catch of a lock mechanism is rocking is shown. It is the side view in which the outline of the engine in the inside of a bonnet, and composition of DPF was illustrated. It is the top view to which the outline of the structure in the inside of the bonnet was illustrated. It is the side view to which the outline of the connection structure of the brake pedal apparatus was shown. It is the front view in which an example of the brake pedal apparatus was shown. It is the side view in which an example of the brake pedal apparatus was shown. FIG. 1 is a perspective view of a tractor in which an example of the arrangement of wires is shown. It is the top view in which the outline of the composition in the inside of the bonnet concerning the modification of a tractor was shown. It is the side view in which an example of the brake pedal device concerning another embodiment was shown. It is the side view which illustrated the rocking state of the brake pedal device concerning another embodiment. It is the side view in which the modification of the brake device concerning another embodiment was shown.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing a form in which a rotary cultivating device 30 as an example of a working device is mounted on a tractor 10 as an example of a working vehicle according to the present embodiment. In the following, for convenience of explanation, the left side in FIG. 1 which is the traveling direction of the tractor 10 is taken as the front direction, and it extends orthogonally to the traveling direction and in the near side and the back side in FIG. The direction is left and right.

  The tractor 10 illustrated in FIG. 1 includes an engine E, a battery BT, a DPF 100 as an example of an exhaust treatment device, a radiator (not shown), a cooling fan, an air cleaner, a generator (not shown), etc. Is equipped. The tractor 10 is provided with, for example, an open / close shaft having a left and right direction as a fulcrum at a rear upper portion of the bonnet 11. The bonnet 11 is configured to be openable and closable relative to the machine body with the open and close axis as a fulcrum. The engine E, the battery BT, the generator, and the radiator are mounted on the chassis 12. For example, an electronically controlled common rail diesel engine is used as the engine E. The common rail is also referred to as an accumulator. The generator is coupled to the output of engine E so as to be powered by engine E. The battery BT is connected to a generator. Then, the tractor 10 is configured such that the electricity generated by the generator is stored in the battery BT.

  The tractor 10 is provided with front wheels 13 and 13 on the left and right sides of the front part that corresponds to the traveling direction of the vehicle, and is provided with rear wheels 14 and 14 on the left and right sides of the rear part. That is, in the tractor 10, the traveling body is supported by the wheels so as to travel freely. Fenders 15 and 15 are provided to cover the left and right rear wheels 14 and 14 from above and from the inside of the tractor 10, respectively. The tractor 10 may be configured to use a crawler for the traveling device.

  The tractor 10 includes an operation unit at the rear of the bonnet 11. More specifically, a dashboard 16 is provided behind the bonnet 11 via an air cut plate (not shown). The dashboard 16 is provided with an instrument panel 40 as a display unit for displaying the speed, the remaining amount of fuel, and the like. A steering column cover 17 is provided adjacent to the rear of the dashboard 16. A steering 18 is provided at the upper end of the steering column cover 17 so as to protrude.

  A driver's seat 20 is provided behind the steering column cover 17 at a predetermined distance. The driver's seat 20 is disposed between the left and right fenders 15, 15. The driver's seat 20, the steering 18 and the like are covered by a cabin 19. That is, the driving unit described above is configured by the cabin 19.

  The tractor 10 is not limited to the configuration having the cabin 19, but may have a configuration in which ROPS (Roll-Over Protective Structures) are provided to project upward at the rear ends of the left and right fenders 15, 15, respectively. .

  A fuel tank 21 for supplying fuel to the engine E is provided below the cabin 19. The position of the fuel tank 21 is not limited, and may be, for example, the side of the cabin 19 or the rear of the driver's seat 20. A fuel supply path (not shown) from the fuel tank 21 to the engine E includes a fuel pump, a common rail, and a plurality of injectors connected to the common rail via a fuel filter. Connected to each. The fuel pump for supplying fuel is configured to pump the fuel of the fuel tank 21 to the common rail. The common rail is configured to store high pressure fuel. The electromagnetic switching control type fuel injection valve is controlled to open and close so that high-pressure fuel in the common rail is injected from the injector to each cylinder of the engine E.

  Below the driver's seat 20, a transmission case TM incorporating a transmission as a transmission mechanism (not shown) for shifting the traveling speed of the tractor 10 continuously, for example, is disposed. The transmission case TM is fixed to the rear of the chassis 12. The transmission has a function of transmitting the power of the engine E to the rear wheels 14, 14. The tractor 10 may be configured to transmit the power of the engine E to the front wheels 13, 13.

  On the upper rear surface of the transmission case TM, for example, a hydraulic working device elevating mechanism 22 for moving up and down the rotary cultivating device 30 mounted as a working device is attached. The working device lifting mechanism 22 is not limited to the hydraulic type, and may be a mechanical type using gears, as long as the working device can be raised and lowered.

  The rotary cultivating device 30 is connected to the rear of the transmission case TM of the tractor 10 via a three-point link mechanism including a pair of left and right lower links 23 and 23 and a top link 24. The front end sides of the left and right lower links 23, 23 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 24 is rotatably connected to the rear of the work device lifting mechanism 22. A PTO (Power Take-Off) shaft 25 for transmitting the driving force of the engine E is interlocked with the engine E and projects rearward from the rear surface of the transmission case TM. The PTO shaft 25 is interlocked and connected to the input shaft of the rotary tilling device 30.

  The work device lifting mechanism 22 has a pair of left and right lift arms 26, 26 which are rotated by a lifting hydraulic cylinder (not shown). The left and right lift arms 26, 26 are respectively connected to the left and right lower links 23, 23 via the left and right lift rods 27, 27. Each of the left and right lift arms 26, 26 is configured to move up and down the rotary cultivating apparatus 30 via each of the left and right lift rods 27, 27 and each of the left and right lower links 23, 23 by pivoting. .

  Next, the driver's seat 20 and the structure around it will be described in detail. FIG. 2 is a plan view schematically illustrating the inside of the cabin 19 (see FIG. 1) and the periphery thereof. As described above, the dashboard 16 is provided with the instrument panel 40, and the upper end of the steering column cover 17 is provided with the substantially round steering 18 in a plan view.

  On the right side of the steering column cover 17, an accelerator lever 50 for setting and holding the output rotational speed (rotational speed) of the engine E is provided. On the left side of the steering column cover 17, a reverser lever 51 (back and forth movement switching lever) for switching the traveling direction of the tractor 10 between forward and reverse is provided. On the lower right side of the steering column cover 17, left and right brake pedals 52, 52 constituting a pair of left and right brake pedal devices for braking the tractor 10 by turning on and off the left and right brake devices (not shown) are provided. The brake for braking the tractor 10 in motion is referred to as a travel brake. On the lower left side of the steering column cover 17 is provided a clutch pedal 53 for operating a main clutch (not shown) for power transmission and disconnection from the engine E.

  The upper surface of the floor 54 in front of the driver's seat 20 is substantially flat. An accelerator pedal 55 for adjusting the rotational speed of the engine E is provided on the floor 54 on the right side of the steering column cover 17.

  On the left and right sides of the driver's seat 20, arm rests 56 are provided for a worker sitting on the driver's seat 20 to place an arm and an elbow. The position of the armrest 56 is configured to be adjustable back and forth and up and down. Below the left side of the driver's seat 20, there is provided a PTO transmission lever 57 connected to the PTO transmission mechanism in the transmission case TM (see FIG. 1) for switching the rotational speed of the PTO shaft 25.

  A main transmission lever 58 connected to the transmission mechanism in the transmission case TM (see FIG. 1) and continuously accelerating and decelerating the traveling speed of the tractor 10 is provided on the right front side of the driver's seat 20. Further, an auxiliary transmission lever 59 is provided adjacent to the main transmission lever 58 for switching the transmission gear ratio of the traveling auxiliary transmission gear mechanism in the transmission case TM (see FIG. 1) to, for example, two stages, high speed and low speed. .

  Next to the auxiliary transmission lever 59, there is provided a PTO drive switch 60 connected to a PTO clutch (not shown) and used when driving the PTO. The PTO drive switch 60 is configured to connect and disconnect the PTO clutch and switch the PTO shaft 25 between the operating state and the non-operating state. That is, in the operating state of the PTO shaft 25, the PTO clutch is engaged, and the PTO shaft 25 rotates at the rotation speed selected by the PTO shift lever 57. On the other hand, when the PTO shaft 25 is not in operation, the PTO shaft 25 stops. The PTO drive switch 60 is configured to be in the operating state when pressed while turning it to either the left or right, and to be in the non-operating state when pressed once in the operating state. You can stop the operation is good.

  In the present embodiment, when the clutch pedal 53 is depressed, the rotation of the PTO shaft 25 and the traveling of the tractor 10 are simultaneously stopped. However, a changeover switch (not shown) may be provided to switch the operation to stop the rotation of the PTO shaft 25 even if the clutch pedal 53 is depressed.

  An operation panel 61 is provided on the right side of the arm rest 56. The operation panel 61 is one in which switches for adjusting the operation of the rotary cultivating device 30 are arranged intensively. The operation panel 61 includes, for example, a depth setting dial, a tilt setting dial, and the like.

  Furthermore, on the right side of the arm rest 56, a side brake lever 62 for maintaining the braking state of the tractor 10 is provided. Such a brake for maintaining the braking state of the tractor 10 is referred to as a parking brake.

  Next, the internal configuration of the hood 11 will be described in detail. FIG. 3 is a side view illustrating the outline of the configuration inside the hood 11. In addition, description of a part of structure is abbreviate | omitted in FIG.

  The bonnet 11 integrally has a grid-like front grill 70 at its lower front. On the other hand, in front of the engine E, a shroud 71 is provided so as to surround a cooling fan which rotates around a longitudinal direction of the tractor 10 as an axis. A radiator 72 is provided in front of the shroud 71. The DPF 100 described above is provided on the engine E. Thus, inside of the bonnet 11, the outside air (air) taken in from the front grille 70 exchanges heat with the cooling water of the radiator 72, and the cooling fan moves to the rear of the engine E and around the DPF 100. And configured to be sent. And the bonnet 11 is comprised so that the air may be discharged | emitted from between the bonnet 11 and an air cut plate.

  At the top of the shroud 71, an intake pipe 73 having an opening for taking in air on the front side of the tractor 10 and extending in the front-rear direction of the shroud 71 is provided. The upper portion of the shroud 71 is formed by cutting out the portion where the intake pipe 73 is disposed, and the upper portion of the shroud 71 and the upper portion of the intake pipe 73 are formed substantially flush. An air cleaner 74 is connected to the intake pipe 73. The air cleaner 74 is configured to remove dust and clean the sucked air. An intake relay pipe 77 is connected to the outlet of the air cleaner 74. On the other hand, on the upper right side of the engine E, an intake manifold 78 for supplying air to each cylinder of the engine E is attached. The intake passage of the engine E is configured such that the air that has passed through the air cleaner 74 is introduced from the intake manifold 78 to each cylinder of the engine E.

Preferably, a turbocharger, not shown, or an exhaust gas recirculation (EGR) device is provided between the air cleaner 74 and the intake manifold 78. Turbocharger is a device that can obtain higher output by compressing the air on the side of the intake passage and feeding it into the engine E using kinetic energy of exhaust gas passing through the exhaust passage of the engine E It is. The EGR system suppresses the generation of nitrogen oxides (NO _x ) by mixing a part of the exhaust gas with air and burning it again at a lower oxygen concentration by feeding it back to the engine E and lowering its maximum combustion temperature. It is something that can be done. Then, in the case of having these, the air which has passed through the air cleaner 74 is introduced into each cylinder of the engine E from the intake manifold 78 via the side of the intake passage of the turbocharger and the EGR device. Configured

  On the other hand, the above-mentioned DPF 100 is connected to the exhaust port of the engine E. The connection configuration between the engine E and the DPF 100 will be described later.

  A hinge 75 is attached to an upper portion of the rear end of the bonnet 11 so as to pivot about the open / close shaft of the tractor 10 described above. The bonnet 11 is configured such that the front side is largely opened upward with the open / close shaft of the rear portion as a fulcrum. The bonnet 11 is not limited to a configuration in which the front side is open, but may be a configuration in which the rear side is open, or a configuration in which left and right side plates which can be separated from the top plate are laterally opened.

  For example, two gas springs 76 and 76 connected to the airframe are attached to the rear of the upper part of the bonnet 11. The gas springs 76, 76 have high pressure air such as nitrogen gas sealed therein. The gas springs 76 and 76 assist the opening and closing of the heavy bonnet 11 by gas reaction force, maintain the open state of the bonnet 11 at a predetermined position, and damp the impact when the bonnet 11 is fully open and fully closed. It is a member for doing. The effects of the gas springs 76, 76 become more pronounced as the tractor 10 becomes larger. It is preferable that the gas springs 76, 76 be of a type that stops at any position.

  Next, the locking mechanism of the hood 11 will be described in detail. FIG. 4 is a perspective view showing an example of the locking mechanism 80 of the bonnet 11.

The lock mechanism 80 has a function of holding the bonnet 11 in a state in which the engine E and the like mounted on the machine body (on the chassis 12) are stored. Locking mechanism 80, Ru provided on one of the front and rear direction of your Keru body inside the hood 11. In the present embodiment, since the bonnet 11 is open on the front side, the lock mechanism 80 is also located on the front side. The lock mechanism 80 includes a lock bar 81, a fitting member 82, a lock catch 83, and pop-up springs 84 and 84 as elastic members. Then, a wire 85 as a power transmission member is connected to the lock mechanism 80 in order to perform the operation at a position away from the lock mechanism 80. The wire 85 is configured by covering the outer periphery of an inner wire made of metal and linearly extended by a cylindrical hollow outer wire constituted by a steel wire formed in a helical shape, a vinyl, or the like.

  The lock bar 81 may be attached to one side of the machine body and the bonnet 11. In the example of FIG. 4, the lock bar 81 is attached to the side of the bonnet 11. The rod-like lock bar 81 is bent in a substantially U-shape in a side view, and portions of both ends extending in the front-rear direction are fixed to the bonnet 11 by welding or the like. And in the state where the bonnet 11 is closed, the portion of the lower end of the bent U character extends substantially horizontally in the front-rear direction.

  The fitting member 82 may be attached to the other side of the machine body and the bonnet 11. In the example of FIG. 4, the fitting member 82 is attached to the side of the airframe. The fitting member 82 is fixed, for example, by a bolt or the like to an upper portion of a substantially gate-shaped front frame 86 in a front view for attaching the above-described radiator 72 to the back side.

  The fitting member 82 is a substantially M-shaped flat plate in a front view. The fitting member 82 extending vertically in a flat plate shape is orthogonal to the lock bar 81 extending substantially horizontally in the front-rear direction. And the fitting member 82 has the notch 87 as a fitting part with the lock bar 81 (refer below-mentioned FIG. 5). More specifically, the fitting member 82 is formed with a substantially U-shaped notch 87 downward from the center portion of the substantially M shape (left and right direction) in a front view. In a front view, the width of the notch 87 is formed to be equal to or larger than the diameter of the lock bar 81. The fitting member 82 further has a spring mounting portion 88 below the lower end of the notch 87. The spring mounting portion 88 illustrated in FIG. 4 protrudes forward from the left end (right end in front view), and a hole is formed in the left-right direction.

  The lock catch 83 may be attached to the other side of the machine body and the bonnet 11. In the illustration of FIG. 4, the lock catch 83 is attached to the side of the airframe. The lock catch 83 is a flat plate overlapping, for example, the front surface side of the fitting member 82. In the example of FIG. 4, the lock catch 83 has a shape in which the mountain shape is turned 90 degrees sideways in a front view, but is not limited thereto.

  FIG. 5 is a front view showing an example of a state in which the lock catch 83 of the lock mechanism 80 is not swung. On the other hand, FIG. 6 is a front view showing an example of a state in which the lock catch 83 of the lock mechanism 80 is swinging. The lock catch 83 is provided so as to be pivotable in the direction in which the rear surface thereof slides relative to the front surface of the fitting member 82. For this reason, a through hole is formed in the lower part of each of the fitting member 82 and the lock catch 83, and the lock catch 83 is swingably attached to the fitting member 82 by a pivot pin 89, for example.

  The lock catch 83 is attached with the wire 85 in the direction opposite to the spring attachment portion 88 of the fitting member 82 on the left and right. Then, when the wire 85 is pulled, the lock catch 83 is configured to be pivotable about the pivot pin 89 (see FIG. 6). More specifically, a hole is formed in the right end (left end in front view) of the lock catch 83 illustrated in FIG. 4 and the like. Then, the hinge pin 90 is inserted into the hole of the lock catch 83 and the hole of the tip (wire terminal) of the wire 85 formed in a ring shape, and the hinge pin 90 is prevented by the split pin 91.

  The lock catch 83 further has a spring mounting portion 92 at substantially the same position in the left and right opposite direction as the spring mounting portion 88 of the fitting member 82 and in the vertical direction. The spring mounting portion 92 illustrated in FIG. 4 and the like protrudes forward from the right end (left end in front view), and a hole is formed in the left-right direction. The spring 93 is mounted between the hole of the spring mounting portion 88 and the hole of the spring mounting portion 92. The spring 93 biases the lock catch 83 in the direction in which the wire 85 is pulled. The spring 93 may be of any type as long as it can bias the lock catch 83, but a tension coil spring is used in the example of FIG. 4 and the like.

  The lock catch 83 has a substantially C-shaped notch 94 in the horizontal direction horizontally to the side where the wire 85 is attached. The lower end of the notch 94 is positioned substantially the same as or slightly lower than the lower end of the notch 87 of the fitting member 82. That is, the notch 94 is formed corresponding to the fitting portion of the fitting member 82 with the lock bar 81 in a front view corresponding to the notch 87. In a front view, the width of the notch 94 is formed to be larger than the diameter of the lock bar 81.

  The lock catch 83 has a hook portion 95 that swings in response to the movement of the wire 85. More specifically, hooks 95 are formed on the notches 94 and extend in opposite directions from the side where the wire 85 is attached. When the wire 85 is pulled most by the biasing force of the spring 93, the notch 87 of the fitting member 82 and the notch 94 of the lock catch 83 form a through hole in a front view. The lock bar 81 is in a position to enter the through hole. The lock bar 81 which has entered the through hole is configured to be locked by the hook portion 95 (see FIG. 5).

  On the other hand, when the lock bar 81 is pushed in from above, the hook portion 95 is configured to swing itself against the biasing force of the spring 93. Therefore, the hook portion 95 is configured such that the upper side thereof is inclined downward toward the projecting end in a front view. Therefore, the hook portion 95 may be configured such that the lower side extends in a substantially horizontal direction, and the upper side is inclined downward toward the projecting end. Further, the hook portion 95 is preferably chamfered at a projecting end connecting the upper side and the lower side so that the lock bar 81 slides smoothly.

  The pop-up springs 84, 84 are attached between the airframe and the bonnet 11, and bias the bonnet 11 in the opening direction. The pop-up springs 84 and 84 may have at least a biasing force that lifts the lock bar 81 not locked by the hook portion 95 above the hook portion 95. Although the pop-up springs 84 and 84 may be attached to either the airframe or the bonnet 11, they are attached to the side of the airframe in the example of FIG. 4 and the like.

  For example, the pop-up springs 84 and 84 are attached to the upper end of the front frame 86 so as to be arranged side by side in the left-right direction. The pop-up springs 84, 84 are constituted by, for example, compression coil springs, and are arranged to be biased in the vertical direction. It is preferable that the pop-up springs 84 and 84 be disposed symmetrically on the left and right in terms of the balance at the time of opening and closing of the bonnet 11 and the suppression of rattling of the bonnet 11. If the pop-up springs 84, 84 can be disposed at the center in the left-right direction, the number may be an odd number.

  When the bonnet 11 is closed by having such a locking mechanism 80, first, the bonnet 11 and the pop-up springs 84, 84 hit the shock before the lock bar 81 hits the hook portion 95. Furthermore, when the bonnet 11 is closed against the biasing force of the pop-up springs 84, 84, the lock bar 81 is pushed downward and the biasing force of the spring 93 is exerted by the upper inclined surface of the hook portion 95. The hook portion 95 swings against the movement. Then, the lock bar 81 having passed through the hook portion 95 reaches the fitting portion with the fitting member 82 and is locked by the hook portion 95 (see FIG. 5).

  On the other hand, when the bonnet 11 is opened from that state, when the hook portion 95 swings against the biasing force of the spring 93 according to the movement of the wire 85, the biasing force of the pop-up spring 84, 84 locks the lock bar. 81 is lifted above the hook portion 95 (see FIG. 6). As a result, the bonnet 11 is also lifted upward by a predetermined amount, for example, a gap where the operator's hand can enter between the machine body and the bonnet 11. The bonnet 11 is opened by the worker from this state. At this time, since the gas springs 76 and 76 (see FIG. 3) are attached between the airframe and the bonnet 11, the bonnet 11 can be opened and closed with a light force and the bonnet 11 can be opened at an arbitrary opening angle. It can be stopped.

  As described above, when the bonnet 11 is closed against the biasing force of the pop-up springs 84 and 84 and the lock bar 81 is positioned below the hook portion 95, the bonnet 11 is locked. Configured to The lock mechanism 80 of the tractor 10 is configured to be able to open the bonnet 11 when the lock bar 81 is positioned above the hook portion 95. Therefore, the tractor 10 provided with the locking mechanism 80 of the bonnet 11 more excellent in workability can be provided.

  Next, the engine E stored in the bonnet 11 and the DPF 100 as an exhaust treatment device will be described in detail. FIG. 7 is a side view schematically illustrating the configuration of the engine E and the DPF 100 inside the bonnet 11.

  The engine E includes a cylinder block 152 incorporating a crankshaft 151 (output shaft) and a plurality of pistons (not shown). The crankshaft 151 extends in the front-rear direction of the engine E, and is rotatably attached to the cylinder block 152. The front and rear ends of the crankshaft 151 project from the front and rear ends of the cylinder block 152, respectively. The engine E is mounted on the chassis 12 (see FIG. 1) such that the crankshaft 151 extends in the front-rear direction of the tractor 10.

  The cylinder head 153 is mounted on the cylinder block 152 with a head gasket (not shown) interposed therebetween. The intake manifold 78 described above is disposed on the right side surface of the cylinder head 153 (see FIG. 3). On the other hand, an exhaust manifold 154 is disposed on the left side surface of the cylinder head 153. Therefore, the exhaust manifold 154 and the intake manifold 78 are respectively distributed and arranged on the left and right side surfaces of the engine E. The upper surface of the cylinder head 153 is covered by a cylinder head cover 155.

  A cooling fan 156 is provided on the front side of the cylinder block 152. On the front side of the cylinder block 152, a crankshaft pulley 157 and a cooling fan pulley 158 are attached to the crankshaft 151 and the rotation shaft of the cooling fan 156, respectively. Between the crankshaft pulley 157 and the cooling fan pulley 158, for example, a cooling fan V-belt 159 for transmitting the power of the crankshaft 151 is provided. As a result, rotational power is transmitted to the cooling fan 156. Then, as described above, the outside air taken into the interior of the bonnet 11 from the front grill 70 by the cooling fan 156 is sent to the rear of the engine E and to the periphery of the DPF 100 after passing through the radiator 72. Be done.

  The exhaust manifold 154 collects exhaust gases generated in each cylinder of the engine E. The exhaust passage of the engine E is configured such that the exhaust gas that has passed through the exhaust manifold 154 is introduced into the DPF 100.

  Between the exhaust manifold 154 and the DPF 100, the above-described turbocharger (not shown) or an EGR device may be provided. The turbocharger is configured to rotate the turbine with the exhaust gas on the side of the exhaust flow path, and drive the centrifugal compressor, for example, by its rotational power to compress the air on the side of the intake flow path . The EGR device is connected to the exhaust manifold 154 and the intake manifold 78 via an EGR cooler that cools the exhaust gas, and includes a valve that regulates the amount of exhaust gas supplied. Then, in the case of having these, the exhaust gas having passed through the exhaust manifold 154 is branched to either the DPF 100 or the intake manifold 78 via the side of the exhaust flow path of the turbocharger and the EGR device. Configured to flow.

  The DPF 100 is connected to the purification inlet pipe 101 connected to the exhaust downstream side of the exhaust manifold 154. The exhaust gas from each cylinder of the engine E is discharged to the outside via the exhaust pipe 102 connected to the outlet side of the DPF 100 via the DPF 100. The DPF 100 filters and collects particulate matter (Particulate Matter (PM)) such as soot (hydrocarbon) contained in exhaust gas, and burns and removes the trapped particulate matter using an oxidation catalyst. It purifies the exhaust gas.

  The DPF 100 has a substantially cylindrical shape made of a heat-resistant metal. The DPF 100 is mounted on the engine E such that its axial direction extends parallel to the crankshaft 151 of the engine E. In the DPF 100, a diesel oxidation catalyst 103 such as platinum and a soot filter 104 are sequentially arranged from the upstream side in the flow direction of the exhaust gas in a substantially cylindrical filter case accommodated via a heat insulating material such as glass wool. Arranged in series. The flow of exhaust gas inside the DPF 100 is in the direction from the rear side to the front side of the tractor 10. Thus, by setting the moving direction of the exhaust gas of the DPF 100 and the direction of the output shaft of the engine E in parallel, the narrow space of the bonnet 11 can be efficiently used.

  Furthermore, the DPF 100 is attached to the side of the exhaust manifold 154 in the left-right direction of the engine E. According to such an arrangement, since the DPF 100 and the exhaust manifold 154 are at a close distance, high temperature exhaust gas can always be introduced to the DPF 100, and the exhaust gas purification performance can be maintained in a good state.

The diesel oxidation catalyst 103 oxidizes nitrogen monoxide (NO) contained in the exhaust gas to unstable nitrogen dioxide (NO ₂ ) when the temperature of the exhaust gas exceeds a renewable temperature (for example, about 300 ° C.) Have an action to The soot filter 104 is a honeycomb structure having a large number of cells partitioned by porous partition walls capable of filtering particulate matter. The DPF 100 may have a structure in which the soot filter 104 itself carries an oxidation catalyst.

As the passage of exhaust gas to the DPF 100 continues, particulate matter deposits on the soot filter 104. Note that the state of particulate matter deposition can be detected by the pressure difference between the upstream and downstream of the soot filter 104. Then, the particulate matter deposited on the soot filter 104 is oxidized and removed with the above-described unstable NO ₂ to regenerate the soot filter 104 and restore the particulate matter collection capability in the soot filter 104. . Therefore, in order to regenerate the soot filter 104, the DPF 100 becomes very hot because a high temperature exhaust gas is introduced or the soot filter 104 itself is heated. Furthermore, even if the particulate matter deposited on the soot filter 104 burns rapidly, the DPF 100 may have a high temperature.

  FIG. 8 is a plan view illustrating the outline of the configuration inside the hood 11. As described above, the DPF 100 serving as a heat source, which is particularly high temperature, is housed in the bonnet 11 above the engine E and either side of the fuselage in the left-right direction. The DPF 100 illustrated in FIG. 8 is disposed on the left side of the tractor 10 so that a substantially cylindrical shaft extends in the front-rear direction.

  On the other hand, an intake pipe 73 and an air cleaner 74 are disposed on the right side of the tractor 10 so as to avoid the center of the tractor 10 in the left-right direction. Furthermore, as described above, the upper portion of the intake pipe 73 is formed substantially flush with the upper portion of the shroud 71. These arrangements effectively store the members in a small space, particularly a small width in the lateral direction, and prevent the bonnet 11 from projecting upward at the center in the lateral direction. Therefore, the view from the driver's seat 20, in particular, toward the ground is wide, and the operability at the time of driving is good.

  In the area of the bonnet 11, the wire 85 connected to the lock catch 83 of the lock mechanism 80 described above is installed on the left and right sides of the vehicle opposite to the DPF 100. In the example of FIG. 8, in the region of the bonnet 11, the wire 85 is disposed on the right side opposite to the DPF 100 disposed on the left side.

  The wire 85 extends from the lock catch 83 located at the front of the bonnet 11 to the right end of the area of the bonnet 11 along the front frame 86. As it is, the wire 85 is stretched along the right end of the area of the bonnet 11 to the rear end of the area of the bonnet 11. A through hole in the front-rear direction is formed in the upper portion of the right end of the shroud 71, and the wire 85 may pass through the through hole.

  Thus, since the wire 85 is extended along the right end so as to be as far as possible from the DPF 100 installed on the left side of the airframe in the region of the bonnet 11, it is affected by the DPF 100 which generates very high heat. It is difficult and does not unnecessarily reduce its durability. The wire 85 is introduced from the rear end of the area of the bonnet 11 into the vicinity of the brake pedal device in the cabin 19.

  Next, the connection structure of the brake pedal device will be described in detail. FIG. 9 is a side view schematically showing the connection structure of the brake pedal device 110. As shown in FIG. The brake pedal device 110 brakes the axles of the rear wheels 14, 14 (see FIG. 1). The tractor 10 is configured to operate a brake device inside a rear axle case (not shown) by operating the brake pedal device 110. The left and right brake pedals 52, 52 constituting the brake pedal device 110 are linked to the left and right brake devices, respectively. The left and right brake pedals 52 and 52 have the same connection structure in a side view in a side view, and therefore, will be described in detail as the connection structure of the brake pedal device 110 collectively.

  The tractor 10 is provided with a brake pedal device 110 for turning on and off the brake device below the dashboard 16 on the front side of the cabin 19. The brake pedal device 110 has an arm (a brake arm 111) which extends downward in a downward direction of the dashboard 16 so as to bend rearward of the vehicle and swings with respect to the vehicle. One end of the brake arm 111 is attached to a pivot shaft 112 extending in the lateral direction within the region of the dashboard 16, and is configured to be pivotable in the longitudinal direction of the machine with the pivot shaft 112 as a fulcrum. On the other hand, the other end of the brake arm 111 is provided with a brake pedal 52 for a worker to step on. The tractor 10 is configured such that the brake arm 111 swings when the brake pedal 52 is depressed.

  At one end of the brake arm 111, a plate 113 extending to the front of the vehicle is fixed. The plate 113 is configured to swing in accordance with the swing of the brake arm 111. The front end of the plate 113 is pivotably connected to the upper end of a vertical connecting rod 114 which penetrates the floor surface of the cabin 19 and extends vertically to the lower side. The connection structure between the plate 113 and the vertical connection rod 114 converts the swinging of the brake arm 111 in the front-rear direction into the vertical direction.

  One end of an L-shaped link 115 that bends in an L-shape is pivotably connected to the lower end of the vertical connection rod 114. An L-shaped link support portion 117 that swingably supports an intermediate portion of the L-shaped link 115 as a link swinging shaft 116 is fixed to the bottom surface of the cabin 19. The other end of the L-shaped link 115 is pivotally connected to the front end of a transverse connecting rod 118 extending in the front-rear direction. As described above, the connection structure of the vertical connection rod 114, the L-shaped link 115, and the horizontal connection rod 118 converts the vertical movement of the vertical connection rod 114 in the front-rear direction.

  The front end of the brake operating lever 119 is swingably connected to the rear end of the lateral connection rod 118. The brake operation lever 119 is provided on the transmission case TM, and is configured to swing on and off so that the brake device can be turned on and off. By the connection structure as described above, the tractor 10 is configured to operate the brake device when the brake pedal 52 is depressed.

  Next, the attachment structure of the wire 85 introduced into the cabin 19 from the bonnet 11 will be described in detail. FIG. 10 is a front view showing an example of the brake pedal device 110, and FIG. 11 is a side view showing an example of the brake pedal device 110. As shown in FIG. Here, the viewpoint from the driver's seat 20 (see FIG. 2 etc.) side is referred to as the front.

  As described above, the brake arm 111 to which the brake pedal 52 is attached at the tip end is configured to be swingable back and forth (back and front sides in FIG. 10) with the pivot shaft 112 as a fulcrum. A hole penetrating in the left-right direction is formed in the middle part of each of the left and right brake arms 111, 111, and a connecting rod 120 as a connecting member for connecting the left and right brake arms 111, 111 is freely insertable into that hole. Provided in For example, the connecting rod 120 is inserted when traveling, and removed when operating. One end of the connecting rod 120 illustrated in FIG. 10 and the like is inserted from the side of the right brake arm 111 into the left brake arm 111, and the other end is the rear side with the driver's seat 20 (see FIG. 2) (FIG. 10). Front side), and is bent downward. Thus, the bent portion on the other end side of the connecting rod 120 serves as the grip portion, and the operability can be improved.

  A substantially C-shaped spring housing support 121 is attached to the right brake arm 111 on the side of the left brake arm 111 above and below the position where the connecting rod 120 is inserted. The compression coil spring 122 is attached to the outer periphery of the connecting rod 120 in the portion between the right brake arm 111 and the spring accommodating post 121 in a state where the left and right brake arms 111 and 111 are connected by the connecting rod 120. In this state, the connecting rod 120 is configured to be biased toward the left brake arm 111 by the compression coil spring 122.

  On the other hand, the connecting rod guide plate 123 is attached to the right of the right brake arm 111. A guide groove 124 substantially J-shaped in front view is formed in the connecting rod guide plate 123. A guide pin 125 inserted in the guide groove 124 is attached to the connecting rod 120. With the above configuration, with the connecting rod 120 pulled out to the right, when the grip is turned upward (the front side in FIG. 10), the left and right brake pedal devices 110 are connected to lower the grip (FIG. 10). And the connection of the left and right brake pedal devices 110 is released.

  Above the pivot shaft 112, a spring mounting post 126 extending in the left-right direction is provided. Between the spring mounting post 126 and each of the left and right brake arms 111, 111, there are attached tension coil springs 127, 127 that bias the left and right brake arms 111, 111 to the rear side (the front side in FIG. 10). Be As a result, when the operator stops depressing the brake pedal 52, the brake arm 111 is configured to swing (return) backward.

  A brake fixing support 128 extending to the left is attached to the middle of the left brake arm 111. On the other hand, a brake arm stop member 129 engaged with the brake fixing post 128 is provided along the swinging locus of the brake fixing post 128. The brake arm stop member 129 is provided with a plurality of concaves and convexes in a sawtooth shape at a position where it is aligned with the brake fixing post 128 when the left brake arm 111 swings by a predetermined angle or more.

  Therefore, in the brake pedal device 110, when the left brake pedal 52 is depressed by a predetermined amount, the brake fixing post 128 and the unevenness of the brake arm stop member 129 are engaged and the left brake pedal 52 is depressed. Configured to That is, the brake pedal device 110 is configured such that the parking brake for keeping the tractor 10 in the braking state by the brake fixing post 128 and the brake arm stopping member 129 is in the on state.

  The brake arm stop member 129 is not provided with asperities at a position where it is aligned with the brake fixing post 128 when the left brake pedal 52 is depressed further from the state where the parking brake functions. Therefore, the brake pedal device 110 is configured such that when the left brake pedal 52 is depressed again after the parking brake has functioned, the engagement between the brake fixing post 128 and the unevenness of the brake arm stopping member 129 is released. Ru.

  And, as described above, the tension coil spring 127 is attached to the left brake arm 111. Then, in the brake pedal device 110, when the left brake pedal 52 is depressed again from the state where the parking brake functions, the brake arm 111 swings rearward (the front side in FIG. 10) and the parking brake is released. Configured as.

  Thus, the tractor 10 is configured such that the parking brake is held in the ON state by depressing one brake pedal device 110 of the pair of left and right brake pedal devices 110. In the example of FIG. 10 and the like, a configuration in which the parking brake is turned on and off is provided on the side of the left brake pedal 52. Furthermore, as described above, the tractor 10 is configured such that the left and right brake pedal devices 110 can be connected by the connecting rod 120. Therefore, in a state where the left and right brake pedal devices 110 are connected, the parking brake is held in the on state by not only the left brake pedal 52 but also the right brake pedal 52 being depressed. Configured

  A brake detection switch mounting post 130 extending in the left-right direction is provided at the rear of the left and right brake arms 111 (in front of FIG. 10). The brake detection switch mounting post 130 extends in parallel with the brake arm 111 pivoted rearward (the front side in FIG. 10) in a side view. There is a gap in a side view between the left and right brake arms 111 and 111 and the brake detection switch mounting post 130. Then, left and right brake detection switches 131 and 131 for detecting the contact with the left and right brake arms 111 and 111 are attached to the gap between the brake detection switch attachment support 130 and the gap. Thus, the left and right brake detection switches 131, 131 are configured to detect whether the left and right brake pedals 52, 52 are depressed respectively.

  The notch 132 is formed in the position which does not overlap with the brake arms 111 and 111 on either side in front view in the brake detection switch mounting support | pillar 130. As shown in FIG. The notch 132 in the example of FIG. 10 is positioned to the right and below the left and right brake detection switches 131, 131 in a front view. Then, a substantially reverse U-shaped notch 132 is formed upward from the lower end of the brake detection switch mounting support 130.

  At an appropriate position in the cabin 19, for example, at the notch 132, an operation lever 140 which constitutes an operation portion for releasing the lock of the lock mechanism 80 is attached. That is, the tractor 10 is configured such that the operation by the operation lever 140 is transmitted to the lock mechanism 80 by the wire 85 between the lock mechanism 80 and the operation lever 140.

  More specifically, the outer wire 141 of the wire 85 introduced into the cabin 19 from the rear end of the area of the bonnet 11 is fixed to the notch 132 as illustrated in FIG. 10 and the like. The inner wire of the wire 85 is connected to the operation lever 140. The control lever 140 is mounted to extend rearward from the brake detection switch mounting post 130 (see FIG. 11). And the control lever 140 can be pulled back. In addition, it is preferable that the attachment location of the control lever 140 is a location which does not become an obstruction of another operation | work, and the operativity is good.

  Next, the method of releasing the lock mechanism 80 of the bonnet 11 will be described in detail. First, the operating lever 140 is pulled rearward by the operator. The operation by the operation lever 140 is transmitted to the lock catch 83 of the lock mechanism 80 by the wire 85. The lock catch 83 swings as the operation lever 140 is pulled against the spring 93, and the lock bar 81 locked by the hook portion 95 is moved upward from the hook portion 95 by the biasing force of the pop-up spring 84, 84. Lift up. That is, the hood 11 is lifted by this operation. The bonnet 11 is not fully opened by the operation with the operation lever 140 at this hand. After that, the hood 11 is opened by the hand of the worker.

  FIG. 12 is a perspective view of the tractor 10 in which an example of the arrangement of the wires 85 is shown. In FIG. 12, the description of the bonnet 11 and the cabin 19 is omitted.

  As also shown in FIG. 12, in the tractor 10 according to the present embodiment, the operation lever 140 for operating the lock mechanism 80 of the bonnet 11 is disposed in the cabin 19. This arrangement can accommodate the rules for obtaining homologation in Europe. That is, the tractor 10 can eliminate the need for the cover as a further release mechanism requiring a key or another tool for the operation lever 140. Furthermore, the tractor 10 can reduce the number of parts. Furthermore, in the tractor 10, the release of the lock mechanism 80 can be operated with one touch, and the operability is good.

  Furthermore, in the tractor 10 according to the present embodiment, the wire 85 connecting the lock mechanism 80 and the operation lever 140 is disposed on the opposite side to the DPF 100 which is a high heat source. This configuration can reduce the influence of heat on the wire 85. In the inside of the bonnet 11, the wire 85 may be fixed to the right side of the engine E by a clamp 143 or the like on a rectangular fixed plate 142 in a side view for fixing a fuel hose or a hose of an air conditioner.

  FIG. 13 is a plan view showing an outline of a configuration inside a hood 11 according to a modification of the tractor 10. As shown in FIG. In the tractor 10 according to the modification, the DPF 100 is disposed on the right side inside the bonnet 11.

  In such a configuration, the wire 85 may be disposed on the left side. Then, the wire 85 is introduced from the rear end of the area of the bonnet 11 into the vicinity of the clutch pedal 53 in the cabin 19. And although detailed illustration is abbreviate | omitted, it should just be attached to a clutch detection switch attachment support similarly to the above-mentioned embodiment.

As described above, according to the present embodiment, the hood 11 is configured to be openable and closable with respect to the machine body, and accommodates and covers the DPF 100 in any of the left and right directions of the machine body. In the tractor 10, the lock mechanism 80 transmits the operation by the operation lever 140 to the lock mechanism 80 between the lock mechanism 80 for locking the bonnet 11, the operation lever 140 for releasing the lock of the lock mechanism 80, and the lock mechanism 80 and the operation lever 140. The lock mechanism 80 is provided on any one of the longitudinal direction of the machine inside the bonnet 11 , the operation lever 140 is provided on the cabin 19, and the wire 85 is on the left and right of the machine with the DPF 100. Because it is installed on the opposite side, the bonnet 11 is not susceptible to heat and has excellent workability. It is possible to provide a tractor 10 with a click mechanism 80.

  Next, the tractor 10 according to another embodiment will be described in detail. FIG. 14 is a side view showing an example of a brake pedal device 210 according to another embodiment. In the tractor 10 according to another embodiment, the mounting position of the operation lever 140 is different. In addition, after the same code | symbol is attached about the structure similar to the above-mentioned embodiment, the description is abbreviate | omitted suitably.

  At the middle of the right brake arm 111 in the brake pedal device 210, an operation lever mounting support 211 extending to the right is attached. And in the illustration of FIG. 14, the notch 212 is formed toward the left direction from the right end of the control lever attachment support | pillar 211. As shown in FIG. In the tractor 10 according to another embodiment, an operating lever 140 which constitutes an operating portion for releasing the lock of the lock mechanism 80 is attached to the notch 212. According to such a configuration, along with the swinging of the right brake arm 111, the operation lever 140 attached to the right brake arm 111 also swings.

  As described above, the brake pedal device 210 is constituted by a pair of left and right brake pedal devices 210 and 210 linked respectively to the left and right brake devices, and a connecting rod integrally linking the pair of left and right brake pedal devices 210 and 210 It further comprises 120 (see FIG. 10 etc.). In the tractor 10, after the pair of left and right brake pedal devices 210, 210 are integrally connected by the connecting rod 120, the parking brake is put in a state where the stepping operation of the brake pedal device 210 is performed. In the tractor 10 according to another embodiment, when the brake device is operated and the parking brake is in the ON state, the operation lever 140 is operable and when the parking brake is in the OFF state, The control lever 140 is configured to be inoperable.

  This is because, for example, when the parking brake is off, the operating lever 140 approaches the dashboard 16 and the operating area of the operating lever 140 disappears, and the parking brake is on when the parking brake is on. This means that the control lever 140 is separated from the position 16 and the operation area of the control lever 140 is secured.

  FIG. 15 is a side view illustrating the rocked state of the brake pedal device 210 according to another embodiment. FIG. 15 shows the position of the brake arm 111 when the parking brake is on. Further shown in FIG. 15 are the lines 220 and 221 of the dashboard 16 at the driver's seat 20 side (rear side). The front and rear direction is partitioned by the dashboard 16 in a straight line 220 which inclines forward from the upper side to the lower side. On the other hand, the line 221 having a convex shape forward and upward below the line 220 is divided by the dashboard 16 in the left-right direction, and the line 221 is open in the vertical direction.

  As shown in FIG. 14, the operating lever 140 is located above the line 221 of the dashboard 16 when the parking brake is off. The operation lever 140 and the line 220 of the dashboard 16 are close to each other. Therefore, even if it is going to pull the control lever 140, the dashboard 16 located in the line 220 becomes obstructive and can not be operated. That is, when the parking brake is off, the operation area of the operation lever 140 disappears and the operation becomes impossible.

  On the other hand, as shown in FIG. 15, the operating lever 140 with the parking brake on is located below the line 221 of the dashboard 16. Not only that, the operation lever 140 and the line 220 of the dashboard 16 are separated. Thus, when the control lever 140 is pulled, the dashboard 16 located in the line 220 does not disturb the operation. That is, when the parking brake is in the on state, the operation area of the operation lever 140 is secured and the operation is possible. According to the configuration as described above, it is possible to physically switch between the operable state of the operation lever 140 and the inoperable state, and erroneous operation can be prevented. Therefore, in the situation where unlocking is necessary, it is possible to provide the tractor 10 having the bonnet 11 locking mechanism 80 which is more excellent in workability.

  In the operable state and the inoperable state, in another aspect, for example, the operating lever 140 is positioned to be shielded by the dashboard 16 when the parking brake is off, and the parking brake is turned on In the state, it means that the position is exposed from the dashboard 16.

  As described above, the operating lever 140 is located above the line 221 of the dashboard 16 when the parking brake is off (see FIG. 14). The operation lever 140 is positioned on the back side of the line 220 of the dashboard 16 as viewed from the driver's seat 20 side. Therefore, the operation lever 140 is located at a blind spot from the driver's seat 20. That is, when the parking brake is off, the operation lever 140 is at a position shielded by the dashboard 16 and becomes inoperable.

  On the other hand, the operating lever 140 with the parking brake engaged is located below the line 221 of the dashboard 16 (see FIG. 15). The operation lever 140 is positioned on the back side of the line 220 of the dashboard 16 as viewed from the driver's seat 20 side. Therefore, when the parking brake is in the on state, the control lever 140 is exposed from the dashboard 16 and becomes operable. According to the configuration as described above, it is possible to visually switch between the operable state of the operation lever 140 and the inoperable state, and erroneous operation can be prevented. Therefore, in the situation where unlocking is necessary, it is possible to provide the tractor 10 having the bonnet 11 locking mechanism 80 which is more excellent in workability.

  In the tractor 10 according to another embodiment, the parking brake is held in the ON state by, for example, the left brake pedal device 210 being stepped on among the pair of left and right brake pedal devices 210, 210. Configured as. Furthermore, the control lever 140 is configured to be attached to the brake arm 111 of the other, for example, the right brake pedal device 210. Therefore, in a state where left and right brake pedal devices 210 and 210 are not connected, the operation attached to right brake pedal device 210 even if the left brake pedal device 210 is depressed and the parking brake is turned on. The lever 140 does not move.

  With such a configuration, it is possible to prevent the operation lever 140 from being in an operable state in a state where the left and right brake pedal devices 210 and 210 are not connected, and to prevent an erroneous operation. That is, the operating lever 140 is not in the operable state unless the tractor 10 is completely stopped and the parking brake is in effect both on the left and the right. And, while the tractor 10 is traveling, the lock bar 81 does not lift up above the hook portion 95. Therefore, in the situation where unlocking is necessary, it is possible to provide the tractor 10 having the bonnet 11 locking mechanism 80 which is more excellent in workability.

As described above, according to another embodiment, in the tractor 10 including the bonnet 11 configured to be openable and closable to the airframe and the cabin 19 behind the bonnet 11, the lock mechanism 80 for locking the bonnet 11 and And an operation lever 140 for releasing the lock of the lock mechanism 80, and a wire 85 for transmitting an operation by the operation lever 140 to the lock mechanism 80 between the lock mechanism 80 and the operation lever 140, and the lock mechanism 80 is a bonnet provided in one of the longitudinal direction of the machine body in the interior of 11, the operating lever 140 is provided on the cabin 19, a dashboard 16 in front of the cabin 19, below the dashboard 16, turns on and off the brake device brakes And a pedal device 210, wherein the brake device is operated and the parking brake is turned on. In the state, the operation lever 140 is made operable, and when the parking brake is turned off, the operation lever 140 is made inoperable, so that erroneous operation is prevented. Can. Therefore, in the situation where unlocking is necessary, it is possible to provide the tractor 10 provided with the bonnet 11 locking mechanism 80 excellent in its workability.

  The operation lever 140 may not be attached to the brake pedal device 210, and may be attached to, for example, the dashboard 16 so as to be operable when the parking brake is in the on state.

  Next, a modification of the tractor 10 according to another embodiment will be described in detail. FIG. 16 is a side view showing a modified example of the brake device according to another embodiment. In a modification of the tractor 10 according to another embodiment, another power transmission member is further provided between the brake pedal device 310 and the side brake device 300.

  The side brake lever 62 which comprises the side brake device 300 is formed in the rod shape extended in the front-back direction in the right side of the armrest 56 (refer FIG. 2). The side brake lever 62 is provided swingably in the vertical direction with the rear side as an axis. The side brake lever 62 is lifted by being pulled upward, and is configured to be pushed down by being pushed downward after the button 301 at the front end of the side brake lever 62 is pushed.

  The tractor 10 is configured such that the operation of the side brake lever 62 is transmitted to another brake device by a link mechanism 302 such as a wire. The front ends of the left and right side brake operating levers 303 and 303 are pivotally connected to the link mechanism 302. The side brake operating levers 303 and 303 are configured to swing so that another brake device can be turned on and off. With the above connection structure, the tractor 10 is configured such that the parking brake is turned on when the side brake lever 62 is lifted, and the parking brake is turned off when the side brake lever 62 is depressed. Ru.

  In a modified example of the tractor 10 according to another embodiment, a wire 311 as another power transmission member is provided between the brake pedal device 310 and the side brake operating lever 303 that constitutes the side brake device 300. Since the brake pedal device 310 is located on the right side of the machine body, it is preferable that a wire 311 be provided between the right side brake operating lever 303 and the brake pedal device 310.

  As illustrated in FIG. 16, a notched axle side wire attachment support 312 is provided in front of the right side brake operating lever 303, and one end 313 a of the outer wire 313 of the wire 311 is fixed. One end 314 a of the inner wire 314 of the wire 311 is fixed to the right side brake operating lever 303.

  On the other hand, as illustrated in FIG. 16, a notched pedal side wire attachment support 315 is provided in front of the right brake arm 111 of the brake pedal device 310, and the other of the outer wire 313 of the wire 311 The end 313b is fixed. The control lever mounting post 316 constituting the brake pedal device 310 is formed with a notch 317 different from the above-described notch 212 (see FIG. 14). The other end 314 b of the inner wire 314 of the wire 311 is fixed to the other notch 317.

  By the connection structure as described above, the modified embodiment of the tractor 10 according to the other embodiment lifts the side brake lever 62 so that the parking brake is in the on state and the right brake arm of the brake pedal device 310 111 is configured to swing. That is, a modification of the tractor 10 according to another embodiment is configured such that the brake pedal device 310 interlocks with an operation of turning on and off another brake device by the side brake lever 62. Therefore, also in the modification of the tractor 10 according to another embodiment, when the brake device is operated and the parking brake is in the ON state, the operation lever 140 is made operable and the parking brake is in the OFF state. In this case, the control lever 140 is configured to be inoperable.

  According to the configuration as described above, it is possible to switch between the operable state and the non-operable state of the operation lever 140 by the two brakes of the brake pedal device 310 and the side brake device 300. , Can prevent accidental operation. Therefore, in the situation where unlocking is necessary, it is possible to provide the tractor 10 having the bonnet 11 locking mechanism 80 which is more excellent in workability.

  The work vehicle of the present disclosure is not limited to the tractor 10. For example, the DPF 100 and the brake pedal device 110 (210, 310), such as a transplant machine or a construction machine, particularly the left and right brake pedal devices 110, 110. It is applicable to a work vehicle provided with (210, 210, 310, 310).

10 tractor (work vehicle)
11 bonnet 16 dashboard 19 cabin (driving part)
52 brake pedal 62 side brake lever 80 lock mechanism 81 lock bar 82 fitting member 83 lock catch 84 pop-up spring (elastic member)
85, 311 Wire 95 Hook section 100 DPF (Exhaust treatment device)
110, 210, 310 brake pedal device 111 brake arm 120 connecting rod (connection member)
140 Operation lever (operation unit)
142 fixed plate 143 clamp 220, 221 dashboard line 300 side brake device

Claims (6)

A hood which is configured to be openable and closable with respect to an airframe, and which houses and covers the exhaust treatment device in any of the left and right directions of the airframe;
In a working vehicle provided with a driving unit behind the hood,
A lock mechanism for locking the bonnet;
An operation unit that releases the lock of the lock mechanism;
A power transmission member for transmitting an operation by the operation unit to the lock mechanism between the lock mechanism and the operation unit;
The locking mechanism is provided in any one of the longitudinal direction of the airframe inside the bonnet ,
Before SL operation unit is provided in the operation unit,
The power transmission member is installed on the left and right sides of the machine opposite to the exhaust treatment device. The work vehicle is
A dashboard is provided on the front side of the driving unit,
The work vehicle according to claim 1, wherein the operation unit is provided below the dashboard. The lock mechanism is
A lock bar attached to one side of the airframe and the bonnet;
A fitting member attached to the other side of the machine body and the bonnet and having a fitting portion with the lock bar;
A lock catch attached to the other side and having a hook portion that swings according to the movement of the power transmission member;
An elastic member attached between the airframe and the bonnet and biasing the bonnet in a direction to open the bonnet;
The bonnet is closed against the biasing force of the elastic member, and when the lock bar is positioned at the fitting portion, the hook portion locks the lock bar so that the bonnet is locked. The work vehicle according to any one of claims 1 to 2, wherein the work vehicle is configured. The work vehicle according to any one of claims 1 to 3, wherein the power transmission member is configured by a wire. The work vehicle according to claim 4, wherein the wire is fixed by a clamp to a fixed plate installed on the left and right sides of the machine opposite to the exhaust treatment device. The work vehicle according to any one of claims 1 to 5, wherein the driving unit is configured by a cabin.

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