JP5830113B2 - Tractor - Google Patents

Description

  The present invention comprises an engine bonnet equipped with a lower engine bonnet that is detachably positioned on the side of a vehicle body of a prime mover, and an upper engine bonnet that is swingably openable and closable that opens and closes above the lower engine bonnet. The present invention relates to a tractor including a fuel tank provided inside a bonnet.

As a tractor capable of easily performing the work of supplying fuel to the fuel tank, the one disclosed in Patent Document 1 has been developed first.
The tractor shown by patent document 1 is equipped with the auxiliary stand arrange | positioned in the lateral outer side of a bonnet part. The auxiliary table includes a mounting surface on which a container for refueling is mounted. The auxiliary base is supported by an upper end portion of a support member having a lower end portion coupled to the right side surface of the clutch housing.

JP-A-2005-335650 (paragraphs [0018], [0019], FIG. 1-4)

  The tractor equipped with the lower engine bonnet and the upper engine bonnet described above can be opened by opening only the upper engine bonnet without opening the lower engine bonnet during normal maintenance and inspection such as supplying cooling water for the engine cooling radiator. I can finish it. When performing special maintenance or inspection, such as changing engine oil, the lower engine bonnet is removed to open the engine bonnet.

In this type of tractor, if the above-described conventional technique is used to provide the mounting member used for mounting the fuel supply tank, it may be troublesome during the special maintenance and inspection described above. It was.
In other words, when the lower engine bonnet is attached, removed, maintained, or inspected, the placement member or the member that supports the placement member may become an obstacle. If the mounting member and the support member are removed so as not to become an obstacle, it takes time to detach them.

  An object of the present invention is to provide a tractor that not only facilitates fuel supply, but also facilitates and efficiently performs special maintenance and inspection work on a prime mover.

The first invention comprises an engine bonnet equipped with a lower engine bonnet that is detachably positioned on the side of the vehicle body of the prime mover, and an upper engine bonnet that can be opened and closed swingably open and close above the lower engine bonnet, A tractor including a fuel tank provided inside the engine bonnet,
The mounting member composed of a member different from the lower engine bonnet can be switched between a use posture in which the mounting surface is directed upward of the vehicle body and a storage posture in which the mounting surface is lateral to the vehicle body. Supported by the lower engine bonnet;
The mounting member is supported by a rear end portion of the lower engine bonnet in a state where the mounting surface extends to the front side of the lower engine bonnet ,
The lower engine bonnet is provided with a reinforcing plate applied to the back side of the portion supporting the mounting member of the lower engine bonnet, and a support portion is provided on the lower engine bonnet connected to the reinforcing plate. The mounting member is supported by the support portion .

  According to the configuration of the first aspect of the present invention, when the mounting member is switched to the use posture, the mounting surface of the mounting member is directed upward of the vehicle body, and the fuel supply tank is mounted on the mounting surface to the fuel tank. Fuel can be supplied.

  According to the configuration of the first aspect of the invention, by removing the lower engine bonnet while the mounting member is supported by the lower engine bonnet, the mounting member and the lower engine bonnet come off at once, and the mounting member becomes an obstacle. It is possible to perform special maintenance and inspection of the prime mover in a state that does not occur.

  Therefore, the fuel supply to the fuel tank can be easily performed by placing the fuel supply tank on the placing member. Moreover, special maintenance and inspection of the prime mover can be performed easily and efficiently without taking any special effort to remove the mounting member and without being damaged by the mounting member.

In the second aspect of the invention, a lower connection mechanism that connects the lower engine bonnet to the lower body and the vehicle body to the lower engine bonnet, an upper connection mechanism that connects the upper engine hood and the vehicle body , wherein the reinforcing plate is al provided over the member constituting the upper connecting mechanism of a member constituting the lower coupling mechanism of the lower engine hood side.
In the third aspect of the invention, the mounting surface is formed in a flat shape, and the mounting member has a width in the vehicle front-rear direction of the mounting surface that is greater than a width of the mounting surface in the lateral direction of the vehicle in the use posture. It is configured to be large.

Overall side view of tractor Overall view of the tractor Side view of the prime mover with the upper engine hood open The perspective view in the decomposition | disassembly state of a mounting member support structure Side view of the mounting member support structure in the mounting member usage posture Side view of the mounting member support structure in the mounting member storage posture (A) is a longitudinal front view in the mounting member use posture of the mounting member support structure, (b) is a vertical front view in the mounting member storage posture of the mounting member support structure. Longitudinal front view with lower engine bonnet installed Longitudinal front view with the lower engine bonnet removed (A) is a side view of the lock mechanism in the storage lock state, and (b) is a side view of the lock mechanism in the use lock state. Perspective view of upper front coupling mechanism Perspective view of lower coupling mechanism

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall side view of a tractor according to an embodiment of the present invention. FIG. 2 is an overall plan view of the tractor according to the embodiment of the present invention. As shown in these figures, the tractor according to the present embodiment is self-propelled by a pair of left and right steering operations and front wheels 1 and 1 that can be driven and a pair of left and right rear wheels 2 and 2 that can be driven, and A self-propelled vehicle equipped with a driving unit 20 having an engine 7 provided at the front of the vehicle body and a driving unit 4 having a driver's seat 4a and a steering handle 4b is provided on the body frame 3 of the self-propelled vehicle. A fall protection frame 5 standing up close to the rear side of the driver's seat 4a and a link mechanism 6 provided at the rear of the vehicle body frame 3 are provided.

  This tractor is configured to connect a rotary tiller (not shown) to the rear part of the body of the self-propelled vehicle so as to be movable up and down by the link mechanism 6 and to transmit the driving force from the engine 7 to the rotary tiller. Thus, various riding-type work machines are configured by connecting various working devices to the rear part of the vehicle body so as to be movable up and down and driving, such as a riding-type field cultivator.

  That is, the vehicle body frame 3 includes the engine 7, a clutch housing 8 connected to the rear part of the engine 7, a transmission case 9 connected to the rear part of the clutch housing 8, and a rear part of the transmission case 9. A transmission case 10 connected to the engine 7 and a front wheel support frame 11 connected to the lower part of the engine 7 are provided.

  The transmission case 10 rotatably supports the pair of left and right rear wheels 2 and 2. The front wheel support frame 11 supports the pair of left and right front wheels 1 and 1 via a front wheel drive case in which the front wheel 1 is rotatably attached to both lateral ends. The transmission case 10 includes a traveling mission (not shown) in which power is transmitted from the engine 7 via the clutch housing 8 and the transmission case 9. 2 and the pair of left and right front wheels 1 and 1.

  The link mechanism 6 includes a pair of left and right lift arms 6a, 6a provided on the top of the mission case 10 so as to be swingable up and down, and a left and right extending from the bottom of the mission case 10 so as to swing up and down toward the rear of the vehicle body. A pair of lower links 6b, 6b, a lift rod 6c that connects the left lift arm 6a and the left lower link 6b, and a lift rod that connects the right lift arm 6a and the right lower link 6b 6c.

  That is, the link mechanism 6 is a hydraulic cylinder in which various working devices are connected to the extended end portions of the pair of left and right lower links 6b and 6b, and the pair of left and right lift arms 6a and 6a are located inside the transmission case 10. The working device is moved up and down with respect to the vehicle body frame 3 by swinging up and down (not shown) and swinging up and down the pair of left and right lower links 6 b and 6 b with respect to the mission case 10. The working device connected to the rear part of the vehicle body is transmitted with driving force from the engine 7 by a work mission (not shown) housed in the mission case 10.

  As shown in FIGS. 1 and 2, the prime mover 20 includes the engine 7, an engine bonnet 21 that houses the engine 7, and the inside of the operation panel 4 c that is positioned on the vehicle body rear side of the engine bonnet 21. An engine fuel tank 22 provided over the inside of the engine bonnet 21 is provided.

  The engine bonnet 21 includes a lower engine bonnet 21a provided on the left and right vehicle body side of the driving portion 20, a front engine bonnet 21b provided on the vehicle body front side of the pair of left and right lower engine bonnets 21a, 21a, And an upper engine bonnet 21c provided above the pair of left and right lower engine bonnets 21a and 21a.

  FIG. 1 shows a closed state of the upper engine bonnet 21c. FIG. 3 shows an open state of the upper engine bonnet 21c. As shown in these drawings, the upper engine bonnet 21c has a vehicle body lateral axis X provided in a connecting mechanism that connects a rear end side of the upper engine bonnet 21c and a pillar 13 provided in the vehicle body frame 3. It swings up and down around and opens and closes the inside of the engine bonnet 21 above the lower engine bonnet 21a and the front engine bonnet 21b.

  The pillar 13 includes a vertical frame portion positioned along the vertical direction of the vehicle body on both lateral sides of the fuel tank 22 and a horizontal frame portion positioned above the fuel tank 22 along the horizontal direction of the vehicle body. It looks like a portal when viewed from the direction. The fuel tank 22 is supported by the pillar 13.

  As shown in FIG. 3, the pair of left and right lower engine bonnets 21a and 21a are provided at a pair of front and rear lower connection mechanisms 60 and 60 provided at the lower end of the lower engine bonnet 21a and at the upper part on the front end side of the lower engine bonnet 21a. The front upper coupling mechanism 65 provided and the rear upper coupling mechanism 66 provided at the upper part on the rear end side of the lower engine bonnet 21a are attached to the vehicle body side.

  As shown in FIGS. 6, 8, and 12, the pair of front and rear lower coupling mechanisms 60 and 60 includes a coupling rod 61 that is provided on the lower engine bonnet 21a with a round bar attached in the longitudinal direction of the vehicle body, and the coupling rod 61 includes An engagement piece 62 is provided on the side of the vehicle body that is configured in the shape of a hook that opens upward in the vehicle body so that it can be freely rotated and engaged. The engagement piece 62 of the front lower connection mechanism 60 is supported by the front wheel support frame 11. The engaging piece 62 of the rear lower coupling mechanism 60 is supported by the pillar 13.

  As shown in FIGS. 8, 9, and 11, the front upper connecting mechanism 65 and the rear upper connecting mechanism 66 include a connecting piece 67 provided by attaching a band plate material to the lower engine bonnet 21a, and a stay provided on the vehicle body side. 68, and a connecting screw 69 for detachably connecting the connecting piece 67 to the stay 68. The stay 68 of the front upper coupling mechanism 65 is supported by a support frame provided on the front wheel support frame 11 so as to support an air cleaner for the engine. The stay 68 of the rear upper coupling mechanism 66 is supported by the pillar 13.

  FIG. 9 is a longitudinal front view of the lower engine bonnet 21a in a removed state. As shown in this figure, each of the lower engine bonnets 21a is connected to the connection piece 67 and the stay 68 in the front upper connection mechanism 65 and the rear upper connection mechanism 66 when performing special maintenance or inspection such as oil replacement of the engine 7. The connection by the connection screw 69 is released, and the connection rod 61 in the pair of front and rear lower connection mechanisms 60, 60 is removed from the engagement piece 62, so that the engine hood 21 is released from the vehicle body side.

  FIG. 8 shows the lower engine bonnet 21a in the middle of desorption with a two-dot chain line. As shown in this figure, the lower engine bonnet 21 can be detached by attaching the lower connection mechanism 60 to the swing fulcrum and swinging while supporting the weight of the lower engine bonnet 21a on the vehicle body side.

  As shown in FIGS. 1 and 2, the fuel tank 22 includes an oil inlet 23 facing an oil hole provided at a rear end portion of the upper engine bonnet 21 c. The lubrication hole of the upper engine bonnet 21c is opened and closed by a cover body 26 that can swing and open. The fuel inlet 22 of the fuel tank 22 is biased toward the side where one lower engine bonnet 21a is located with respect to the center of the engine bonnet 21 in the lateral direction of the vehicle body.

  As shown in FIGS. 1 and 2, the driving unit 20 includes a mounting member 30 provided on the lateral outer side of the engine bonnet 21 on the side close to the oil filling port 23.

  FIG. 4 is a perspective view of the support structure of the mounting member 30 in an exploded state. FIG. 5 is a side view of the support structure of the mounting member 30 described above. FIG. 7 is a longitudinal front view of the support structure of the mounting member 30 described above. As shown in these drawings, the mounting member 30 is supported at the rear end portion of the lower engine bonnet 21 via a longitudinal support shaft 31 connected to one end portion in the lateral width direction. Supported by the portion 32.

  The support portion 32 is formed of a bent sheet metal attached to the lower engine bonnet 21a with a connecting bolt 33, and includes a pair of support plates 32a and 32a arranged in the vehicle longitudinal direction. The front end side of the support shaft 31 is connected to the mounting member 30 so as to be rotatable integrally, and the rear end side of the support shaft 31 is connected to the pair of front and rear support plates 32a, 32a so as to be rotatable. The mounting member 30 is pivotally supported by a support portion 32 so as to swing around a longitudinal axis P of the vehicle body included in the support shaft 31. The support shaft 31 is slidably supported by a pair of front and rear support plates 32a and 32a.

  As shown in FIGS. 4 and 8, the lower engine bonnet 21 a includes a reinforcing plate 25 applied to the back side of a portion of the lower engine bonnet 21 a that includes the support portion 32, and the use of the mounting member 30. It is reinforced by the reinforcing plate 25 so as to have the strength to enable the above. The reinforcing plate 25 is provided with a length in the vertical direction of the lower engine bonnet from the upper end U to the lower end D of the lower engine bonnet 21a, and is tightened together with the support portion 32 by the connecting bolt 33 to lower the lower engine bonnet 21a. 21a.

  The upper end U of the lower engine bonnet 21a is a portion that engages with the peripheral edge of the upper engine bonnet 21c when the upper engine bonnet 21c is closed. The lower end portion D of the lower engine bonnet 21a is a portion having an end portion that is bent toward the back side of the lower engine bonnet portion 21a. The reinforcing plate 24 forms a support portion to which the connecting rod 61 of the lower connection mechanism 60 is attached and a support portion to which the connection piece 67 of the rear upper connection mechanism 66 is attached to the lower engine bonnet 21a.

  As shown in FIG. 5, the support portion 32 includes a lock mechanism 40 provided over the rear support plate 32 a and the support shaft 31. As shown in FIGS. 4, 5, and 7, the lock mechanism 40 includes a positioning pin 41 having a circular cross section provided on the support shaft 31 so as to be integrally rotatable between the pair of support plates 32 a and 32 a, and the rear side. A holding cam 42 fixed to the support plate 32a, and a lock spring 43 mounted on the support shaft 31 disposed between the positioning pin 41 and the front support plate 32a. The holding cam 42 includes a use holding recess 44 and a storage holding recess 45 arranged in the circumferential direction of the support shaft 31. The lock spring 43 slidably biases the support shaft 31 by pressing against the positioning pin 41 with the front support plate 32a as a reaction force member, whereby the positioning pin 41 is used for the use holding recess 44 and the storage holding recess 45. Engage in.

  5 and 7A show a state in which the mounting member 30 is supported in the use posture and a use lock state of the lock mechanism 40. FIG. As shown in these drawings, when the mounting member 30 is swung around the axis P, and the positioning pin 41 and the use holding recess 44 are matched, the mounting member 30 reinforces the mounting member 30. The mounting surface 34 provided with the protrusions 34a is in a use posture in which the vehicle body is directed upward. When the mounting member 30 is in the use posture, the lock spring 43 is operated to the state where the positioning pin 41 is engaged with the use holding recess 44, that is, the state shown in FIG. As a result, the lock mechanism 40 enters the use lock state so that the mounting member 30 is held in the use posture by the locking of the support shaft 31 via the positioning pin 41 by the holding cam 42.

  6 and 7B show a state in which the mounting member 30 is supported in the retracted posture and a retracted lock state of the lock mechanism 40. FIG. As shown in these drawings, when the mounting member 30 is swung around the axis P and the positioning pin 41 and the storage holding recess 45 are aligned, the mounting surface of the mounting member 30 is the vehicle body. The storage posture is taken along the outer surface of the lower engine bonnet 21a in a state of facing outward in the lateral direction. When the mounting member 30 is in the retracted position, the lock spring 43 is operated to engage the positioning pin 41 in the storing and holding recess 45, that is, the state shown in FIG. As a result, the lock mechanism 40 enters the storage lock state so that the mounting member 30 is held in the storage posture by the locking of the support shaft 31 via the positioning pin 41 by the holding cam 42.

  When the mounting member 30 is swung from the storage posture to the use posture, the positioning pin 41 is detached from the storage holding recess 45 so that the lock mechanism 40 automatically releases the storage lock state. The depth is smaller than the radius of the positioning pin 41. When the mounting member 30 is in the use posture, the depth of the use holding recess 44 is deeper than the storage holding recess 45 so that the positioning pin 41 does not come off from the use holding recess 44 due to a load applied to the mounting member 30. It has become. Specifically, the depth is larger than the radius of the positioning pin 41. As a result, when the mounting member 30 is slid against the lock spring 43, the positioning pin 41 is detached from the use holding recess 44, and the lock mechanism 40 releases the use lock state.

  As shown in FIG. 5, the support portion 32 includes a cap holder portion 50 disposed on the opposite side of the support plate 32a from the side on which the mounting member 30 is located. The cap holder portion 50 is integrally formed with a cover 51 made of a resin material attached to a pair of front and rear support plates 32a and 32a so as to cover the lock mechanism 40. FIG. 4 shows a perspective view of the cover 51. FIG. 5 is a side view of the cap holder portion 50 in a state where the oil filler cap is accommodated. As shown in these drawings, the cap holder portion 50 receives and supports the outer peripheral surface portion of the oil filler cap 24 by the bottom portion 50a thereof, and locks the upper surface of the oil filler cap 24 by the tip portion 50b of the cap holder portion 50. By doing so, the oil filler cap 24 is accommodated.

  That is, when the fuel is supplied to the fuel tank 22, the mounting member 30 is switched to the use posture. At this time, by the raising operation from the storage posture of the placement member 30 toward the use posture, the positioning pin 41 is automatically detached from the storage holding recess 45 and the lock mechanism 40 releases the storage lock state. The storage lock is released. When the mounting member 30 is swung up and switched to the use posture, the positioning pin 41 is engaged with the use holding recess 44 for the lock spring 43 and the lock mechanism 40 is automatically switched to the use lock state. Instead, the mounting member 30 is held in the use posture. Thereby, the fuel supply tank 55 can be placed on the placement surface 34 of the placement member 30, and the fuel can be easily supplied while the fuel supply tank 55 is supported by the placement member 30. At this time, it is possible to prevent forgetting to attach the fuel filler cap 24 to the fuel tank 22 by storing the fuel filler cap 24 removed from the fuel tank 22 in the cap holder portion 50. That is, when the fuel supply is finished and the mounting member 30 is stored, if the oil filler cap 24 is present in the cap holder 50, it is recognized that the user has forgotten to attach the oil filler cap 24.

When the fuel supply to the fuel tank 22 is completed, the mounting member 30 is slid against the lock spring 43. As a result, the positioning pin 41 comes off from the use holding recess 44, and the lock mechanism 40 releases the use lock state. Thus, when the lock of the mounting member 30 in the use posture is released, the mounting member 30 is operated to swing downward. Then, the mounting member 30 is switched to the retracted posture. Along with this, the positioning pin 41 engages with the storage holding recess 45 for the lock spring 43, and the lock mechanism 40 enters the use lock state. As a result, the mounting member 30 can be retracted to the inside of the vehicle body from the time of use, and can be held and stored so as not to be easily shaken by vibration.

[Another Example]
In place of the mounting member 30 of the above-described embodiment, the mounting member 30 is in the retracted position by being swung up from the use posture, and the mounting surface 30 of the mounting member 30 in the retracted position has a vehicle body surface. You may implement and employ | adopt the structure which becomes the attachment attitude | position along the outer surface of the lower engine bonnet 21a and the upper engine bonnet 21c in the state which faced the inner side in the horizontal direction. Also in this case, the object of the present invention can be achieved.

20 Driving part 21 Engine bonnet 21a Lower engine bonnet 21c Upper engine bonnet 22 Fuel tank 25 Reinforcement plate 55 Fuel supply tank U Upper end of lower engine bonnet D Lower end of lower engine bonnet

Claims (3)

An engine bonnet equipped with a lower engine bonnet that is detachably located on the side of the vehicle body of the prime mover, and an upper engine bonnet that can swing open and close above and below the lower engine bonnet is provided inside the engine bonnet. A tractor with a fuel tank provided,
The mounting member composed of a member different from the lower engine bonnet can be switched between a use posture in which the mounting surface is directed upward of the vehicle body and a storage posture in which the mounting surface is lateral to the vehicle body. Supported by the lower engine bonnet;
The mounting member is supported by a rear end portion of the lower engine bonnet in a state where the mounting surface extends to the front side of the lower engine bonnet ,
The lower engine bonnet is provided with a reinforcing plate applied to the back side of the portion supporting the mounting member of the lower engine bonnet, and a support portion is provided on the lower engine bonnet connected to the reinforcing plate. The tractor having the mounting member supported by the support portion . On the lower engine hood comprises a lower coupling mechanism which connects the body and the lower end of the lower engine hood, and a connecting mechanism on which connects the body and the upper end of the lower engine hood, the reinforcing plate the tractor of claim 1 from the member constituting the lower coupling mechanism of the lower engine hood side are al provided over the member constituting the upper coupling mechanism. The mounting surface is formed in a flat shape,
The tractor according to claim 1 or 2, wherein the mounting member is configured such that a width of the mounting surface in the longitudinal direction of the vehicle body is larger than a width of the mounting surface in the lateral direction of the vehicle body in the use posture.

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