JP2010052599A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle allowing a worker to easily close a hood with a simple constitution using a string body and a winding means. <P>SOLUTION: The working vehicle 1 includes a traveling machine body 2 mounted with an engine 5 and the hood 6 for covering the engine 5. The hood 6 is constituted to be rotatable around an opening/closing fulcrum shaft 63. The working vehicle 1 is provided with the string body 80 to be a holding part when closing the hood 6. The string body 80 has one end side and the other end side connected to the hood 6 and the winding means 82 for winding the string body 80, respectively. The winding means 82 is provided on the traveling machine body 2 side. The string body 80 is drawn from the winding means 82 by an opening operation of the hood 6, and is wound by the winding means 82 by a closing operation of the hood 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a work vehicle such as a tractor used for farm work, and more particularly to a work vehicle in which a hood covering an engine is configured to be openable and closable.

In a work vehicle such as a tractor, a device such as an engine is mounted on the front portion of the traveling machine body and covered with a bonnet, and the bonnet is opened when maintenance of the device such as the engine is performed. Therefore, in order to improve the operability of opening the bonnet and improve the efficiency of the maintenance work, an open / close fulcrum shaft is arranged at the rear of the bonnet, the bonnet is rotated around the open / close fulcrum shaft, and the front of the bonnet is moved upward. The upper surface side of the engine was opened by lifting up (see Patent Document 1).
JP 2003-237634 A

  However, when the open / close fulcrum shaft at the rear part of the bonnet is turned around, the front part of the bonnet is lifted to a high position in a work vehicle such as a large tractor equipped with an engine having a large horsepower. Therefore, when closing the bonnet, it is difficult for the operator's hand to reach the front part of the bonnet and to close the bonnet even if the front part of the bonnet, which is the tip of the rotation, is pulled downward. was there.

  An object of the present invention is to provide a work vehicle in which an operator can easily close a bonnet with a simple configuration using a string body and a winding means.

  In order to achieve the above object, a work vehicle according to the first aspect of the present invention includes a traveling machine body on which an engine is mounted and a bonnet that covers the engine, and the bonnet is configured to be rotatable about an opening / closing fulcrum shaft. In the work vehicle, a string body is provided as a grip portion when closing the bonnet, and the string body is connected to winding means for winding up the string body at one end side to the bonnet and the other end side, Winding means is provided on the traveling machine body side, and the string body is drawn from the winding means by the opening operation of the bonnet, and is wound by the winding means by the closing operation of the bonnet. It is characterized by being.

  Further, the invention according to claim 2 is the work vehicle according to claim 1, wherein the opening / closing fulcrum shaft is provided on the rear end side of the bonnet, and the front support frame is provided on the front end side of the bonnet, A bonnet hook attached to the front support frame is configured to detachably engage with a bonnet lock mechanism provided on a front end side of the traveling machine body, and one end side of the string body is configured to be the front part. It is connected to a support frame.

  According to a third aspect of the present invention, in the work vehicle according to the first aspect, on the traveling machine body side, a guide for adjusting a tension posture of the string body between the bonnet and the winding means. A body is provided.

  According to the first aspect of the present invention, the string body is provided as a grip portion when closing the bonnet, and the string body is respectively provided to the winding means for winding the string body on one end side and the other end side on the bonnet. Since they are connected, when the bonnet is rotated from the open position to the closed position, the operator can draw the bonnet downward by grasping the string body without directly placing a hand on the bonnet. Therefore, even with a large work vehicle, even if the bonnet is rotated and lifted to a high position when it is opened, the operator can easily close the bonnet by using the string body. Are better. In addition, since the cord body is wound around the winding means by the closing operation of the bonnet, when the bonnet is closed, the cord body may be bent and caught on the engine or its surrounding parts, or may protrude from the bonnet. It can also be suppressed.

  According to the second aspect of the present invention, the front support frame is configured to have high rigidity because the bonnet hook that engages with and disengages from the bonnet lock mechanism is attached. Therefore, the string body can be firmly attached to the front support frame, and even if a large tension is repeatedly applied to the string body in accordance with the opening / closing operation of the bonnet, the string body can be hardly detached from the front support frame. . Moreover, since the string is attached using the front support frame to which the bonnet hook is attached, it is possible to suppress an increase in the number of parts for attaching the string.

  According to the invention described in claim 3, since the tensioning posture of the string body between the bonnet and the winding means can be changed using the guide body, the winding means is installed at an arbitrary position. However, the string body can be stretched at a position avoiding interference with the engine, its attached parts, etc., or at a position where the operator can easily grip the string.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The embodiment is a case where the present invention is applied to a farm tractor 1 as a work vehicle. In the following description, the left side is simply referred to as the left side and the right side is simply referred to as the right side in the traveling direction of the tractor 1.

  The traveling machine body 2 of the tractor 1 in the embodiment is supported by a pair of left and right rear wheels 4 as well as a pair of left and right front wheels 3 as a traveling unit. The tractor 1 is configured to travel forward and backward by driving the front wheels 3 and the rear wheels 4 with a diesel engine 5 mounted on the front portion of the traveling machine body 2. The engine 5 is covered with a bonnet 6. A cabin 7 (control section) is disposed on the upper surface of the traveling machine body 2.

  Inside the cabin 7, a control seat 8 on which an operator P sits and a control column 20 positioned in front of the control seat 8 are mounted. A steering handle 9 (round handle) as steering means is provided on the top of the steering column 20. A pair of left and right steps 10 for the operator P to get on and off are provided on the left and right outer portions below the cabin 7. Fuel tanks 11 for storing fuel are respectively disposed on the lower surfaces of the left and right steps 10.

  The traveling machine body 2 includes an engine frame 13 having a front bumper 12 and left and right step frames 14 fixed to a rear portion of the engine frame 13 by bolts. The engine frame 13 supports the engine 5 from below. The left and right step frames 14 constitute a part of the elements constituting the step 10 on which the worker P gets on and off.

  A transmission case 15 is mounted on the rear surface of the clutch housing 21 for appropriately shifting the power from the engine 5 and transmitting it to the front wheels 3, the rear wheels 4, and a PTO shaft 19 described later. A rear axle case 16 is mounted on the rear portion of the transmission case 15 so as to protrude outward in the left-right direction. The left and right rear wheels 4 are rotatably disposed on the left and right tip sides of the rear axle case 16 and are covered from above with left and right rear fenders 17.

  On the rear upper surface of the mission case 15, a hydraulic lifting mechanism 18 for lifting and lowering a working portion such as a potato harvester is detachably attached. Although not shown in detail, the working unit is connected to the rear part of the mission case 15 via a three-point link mechanism. On the rear surface of the mission case 15, a PTO shaft 19 for transmitting a PTO driving force to the working unit is provided to project rearward.

  Next, the structure of the front part of the traveling machine body 2 such as the engine 5 and the bonnet 6 will be described. As shown in FIGS. 1 and 3, a radiator 47, an air cleaner 48, a battery 49, and the like are disposed on the upper side of the engine frame 13 in front of the engine 5. The air cleaner 48 is attached to the front side of the engine room front frame 50. A front shielding plate 51 is extended to the left and right and above the radiator 47, and a gap formed between the bonnet 6 and the radiator 47 is blocked by the front shielding plate 51.

  The bonnet 6 is provided so as to cover the upper side, the upper side, and the front of the engine 5 and its attached parts, and the side bonnet 6b is provided so as to cover the left and right side lower parts of the engine 5 and its attached parts. ing.

  As shown in FIGS. 2 to 5, on the rear side of the engine 5, an opening / closing support plate 61 having a flat plate portion extending in the up / down / left / right direction is erected upward from the traveling machine body 2. A shaft support plate 62 is attached to the upper end side of the opening / closing support plate 61. The shaft support plate 62 has a flat plate portion extending in the vertical and horizontal directions, and the flat plate portion of the shaft support plate 62 is located behind the flat plate portion of the opening / closing support plate 61. The opening / closing support plate 61 is formed with side plate portions extending from the front to the rear on the left and right sides of the flat plate portion, and is formed in a U-shape facing backward in plan view. The shaft support plate 62 is formed with side plate portions extending from the rear to the front on the left and right sides of the flat plate portion, and is formed in a forward U-shape in plan view. The side plate portion of the opening / closing support plate 61 and the side plate portion of the shaft support plate 62 are overlapped, and these are fixed via bolts 62a.

  The upper end edge of the shaft support plate 62 is located higher than the upper end edge of the open / close support plate 61, and an open / close fulcrum shaft 63 extending to the left and right is fixed to the upper end of the shaft support plate 62. An attachment frame 64 for connecting the gas spring 66 is fixed to the front side of the opening / closing support plate 61 with bolts 64a. A mounting portion 64b is integrally extended from the left and right ends of the mounting frame 64 toward the front, and one end of the gas spring 66 is mounted on the outer side surface of the mounting portion 64b. The attachment of the gas spring 66 will be described later.

  A rear support frame 31 extending in the left-right direction is fixed to the inner surface of the rear part of the bonnet 6 to reinforce the rear part of the bonnet 6. A substantially plate-shaped gas spring support frame 65 is fixed to the center portion in the left-right direction of the rear support frame 31 by bolts 65a. The left and right end portions of the gas spring support frame 65 are bent downward (on the side away from the bonnet 6) to form a first attachment piece portion 65b. Left and right end portions of the opening / closing fulcrum shaft 63 are inserted into the left and right first attachment pieces 65b, respectively, and the bonnet 6 is attached to be rotatable around the opening / closing fulcrum shaft 63.

  The gas spring support frame 65 is integrally formed with two support portions 65c extending in parallel toward the front. The front end of the support portion 65c extends to a substantially central portion of the bonnet 6 in the front-rear direction. A central support frame 32 extending in the left-right direction is fixed along the inner surface of the substantially central part in the front-rear direction of the bonnet 6 to reinforce the central part of the bonnet 6.

  The front end side of the support portion 65c is fixed to the center support frame 32 by a bolt 65d. The inner side end portion of the support portion 65c is bent downward (side away from the bonnet 6) over its entire length to form a second attachment piece portion 65e. A gas spring 66 is provided so as to connect the second attachment piece 65e and the attachment portion 64b of the attachment frame 64 described above. Two gas springs 66 are arranged on the left and right.

  A bracket 66a at one end in the longitudinal direction of the gas spring 66 is rotatably fitted in a bush 67 inserted so as to penetrate the mounting portion 64b to the left and right. In order to prevent the gas spring 66 from coming off, a retaining bolt 68 is inserted into the bush 67 from the outside of the bracket 66a, and the bolt 68 is screwed into a nut 68a disposed on the opposite side across the bush 67. .

  The bracket 66b at the other end in the longitudinal direction of the gas spring 65 is rotatably fitted in a bush 67 inserted so as to penetrate the second attachment piece 65d to the left and right. Similarly to the bracket 66 a, a retaining bolt 68 is inserted into the bush 67 from the outside of the bracket 66 b, and the bolt 68 is screwed into a nut 68 a disposed on the opposite side across the bush 67.

  As described above, the bonnet 6 is provided so as to be rotatable about the opening / closing fulcrum shaft 63. When the bonnet 6 is lifted, the gas spring 66 extends to support the opening posture of the bonnet 6, thereby the engine frame 13. The upper side, the front side, and the side front side of the engine 5 and its attached components arranged above are opened.

  As shown in FIGS. 2 and 3, a front support frame 33 is fixed along the inner surface on the lower end side of the front portion (front grill portion) of the bonnet 6 to reinforce the front portion of the bonnet 6. The front support frame 33 is bent at the center in the left-right direction of the bonnet 6 so as to protrude rearward in a substantially U shape, and the protruding portion of the front support frame 33 has a U shape. The bonnet hook 71 is fixed so as to protrude rearward.

  The bonnet hook 71 is detachably locked to a bonnet lock mechanism 73 provided on the front side of the engine frame 13. As shown in FIG. 6, the bonnet lock mechanism 73 includes a lock frame 75 that is fastened to the engine frame 13 with bolts 74. A lock notch 77 is formed upward in the lock frame 75. A release lever 72 is pivotally supported on the lock frame 75 via a lock fulcrum shaft 76. The release lever 72 is formed in an approximately L shape, and includes an operation portion 72 a that is operated by the operator P and a hook-shaped locking portion 72 b that is locked to the bonnet hook 71 fitted in the lock notch 77. Have. The lock frame 75 and the release lever 72 are connected to each other by a lock holding spring 78, and the release lever 72 is urged by the lock holding spring 78 in a direction to engage with the bonnet hook 71.

  The bonnet hook 71 is locked to the engine frame 13 via the hood lock mechanism 73, whereby the hood 6 is held at a position where the engine room 54 is closed. When closing the bonnet 6, if the bonnet hook 71 comes into contact with the locking portion 72 b of the release lever 72, the release lever 72 is rotated by a force that presses the bonnet 6 downward, and the bonnet hook 71 fits into the lock notch 77. I can get stuck. Then, due to the restoring force of the lock holding spring 78, the release lever 72 returns to the posture in which the bonnet hook 71 is locked and held by the lock notch 77.

  Next, the string 80 that becomes a grip when the bonnet 6 is closed will be described. The string 80 has flexibility, and in this embodiment, a band made of synthetic fiber is applied. One end of the string body 80 is penetrated by a bolt 81, and the bolt 81 is fixed to the front support frame 33 attached to the bonnet 6, whereby one end of the string body 80 is connected to the bonnet 6. The other end of the string body 80 is connected to a winding means 82 that winds the string body 80.

  Although not shown in detail, the winding means 82 includes a so-called cord reel mechanism. As shown in FIG. 4, a winding reel 82b around which a string body 80 is wound inside a casing 82a, a string A mainspring spring 82c for urging the take-up reel 82b in the direction of winding the body 80 is provided. The casing 82 a of the winding means 82 is attached to a base 84 fixed with a bolt 83 on the upper end side of the front surface of the engine room front frame 50 via a support portion 85.

  When a structure capable of freely rotating the casing 82a in the vertical and horizontal directions is applied as the support portion 85, the casing 82a is adapted according to the posture (stretching direction) of the string body 80 that accompanies opening and closing of the bonnet 6. Therefore, the string body 80 can be taken up and pulled out quickly from the take-up reel 82b. The support 85 is preferably a hook, a ball joint, or the like.

  Accordingly, when the release lever 72 of the bonnet lock mechanism 73 described above is operated to release the lock of the bonnet hook 71 from the lock frame 75, the bonnet 6 rotates about the opening / closing fulcrum shaft 62 and moves forward. The side can be lifted upward. With the opening operation of the bonnet 6, the string body 80 is pulled out from the winding means 82, and between the front support frame 33 of the bonnet 6 in the open position and the upper end side of the front surface of the engine room front side frame 50. It is stretched.

  When closing the bonnet 6, the operator P can pull the bonnet 6 downward by grasping and pulling an arbitrary position of the string body 80. That is, the closing operation of the hood 6 can be started without the operator P directly touching the hood 6 in the open position. Then, as the bonnet 6 is completely closed, the string body 80 is automatically wound around the winding means 82.

  If comprised in this way, in the large tractor 1 carrying the engine 5 with large horsepower, when the bonnet 6 is in the open position, the tip of the rotation of the bonnet 6 is higher than the height that the operator P can reach. Even if it is lifted, the operator P can easily close the bonnet 6 by gripping and pulling the string body 80. Then, the string body 80 is quickly wound around the winding means 82 by the closing operation of the bonnet 6, so that the bonnet 6 is closed between the front support frame 33 of the bonnet 6 and the winding means 82. The string body 80 is stretched without slack. Accordingly, it is possible to reduce the inconvenience that the slack string body 80 is sandwiched between the closed bonnet 6 and the engine frame 13 and protrudes outward, or the string body 80 is entangled with the engine 5 and its attached parts.

  As described above, in the present embodiment, the tractor 1 includes the traveling machine body 2 on which the engine 5 is mounted and the bonnet 6 that covers the engine 5, and the bonnet 6 in the bonnet 6 is configured to be rotatable around the opening / closing fulcrum shaft 63. In a work vehicle such as the above, a string body 80 is provided as a grip portion when closing the bonnet 6, and the string body 80 is connected to a winding means 82 that winds the string body 80 at one end side and the string body 80 at the other end side. The winding means 82 is provided on the traveling machine body 2 side, and the string body 80 is pulled out from the winding means 82 by the opening operation of the bonnet 6 and wound by the winding means 82 by the closing operation of the bonnet 6. It is configured. Therefore, when rotating the bonnet 6 from the open position to the closed position, the operator P can pull the bonnet 6 downward by grasping the string body 80 without directly placing a hand on the bonnet 6.

  In particular, when the horsepower of the engine 5 is large and the tractor 1 is large, the front part of the bonnet 6 rotates and is lifted to a high position when it is opened. Since the front part of the bonnet 6 can be pulled and closed easily, the operability at the time of closing is excellent.

  Since the string body 80 is automatically wound around the winding means 82 by the closing operation of the bonnet 6, the string body 80 is bent when the bonnet 6 is closed, and the engine 5 and its peripheral components are attached. It is also possible to prevent the hook from being caught on the outside or being caught between the bonnet 6 and the engine frame 13 and protruding outside.

  An opening / closing fulcrum shaft 63 is provided on the rear end side of the bonnet 6, a front support frame 33 is provided on the front end side of the bonnet 6, and a bonnet hook 71 attached to the front support frame 33 is connected to the traveling machine body 2. The bonnet lock mechanism 73 provided on the front end side is configured to be detachably locked, and one end side of the string body 80 is connected to the front support frame 33. The front support frame 33 is provided to reinforce the bonnet 6 and supports the bonnet hook 71 that engages with and disengages from the bonnet lock mechanism 75, and is thus configured to have high rigidity. Accordingly, one end side of the cord body 80 can be firmly attached to the front support frame 33, and the cord body 80 is supported even if a large tension is repeatedly applied to the cord body 80 as the bonnet 6 is opened and closed. It can be made difficult to come off from the frame 33.

  And since the string body 80 is attached using the front support frame 33 to which the bonnet hook 71 is attached, an increase in the number of parts due to the attachment of the string body 80 can also be suppressed.

  Next, a second embodiment of the present invention will be described with reference to FIGS. The bonnet 6 of the second embodiment covers the upper side, the upper side and the front upper part of the engine 5 and its attached parts, and the lower bonnet 6c covers the lower side and the lower front part of the engine 5 and its attached parts. Is formed.

  As shown in FIGS. 7 and 8, one end of the string body 80 is fixed to the front support frame 33 fixed to the inner surface of the bonnet 6 with a bolt 81. The winding means 82 is fixed on the upper surface of the engine frame 13 and in front of the battery 49. A lower bonnet support frame 90 is fixed to the inner surface of the lower upper bonnet 6c at the front upper end side, and a guide body 91 having a ring portion 92 through which the string body 80 is inserted into the lower bonnet support frame 90 with bolts 91a. It is fixed. That is, the string body 80 is stretched between the bonnet 6, the guide body 91, and the winding means 82. In the figure, only one guide body 91 is installed, but the number and installation positions of the guide bodies 91 can be changed as appropriate.

  Thus, in 2nd Embodiment, the guide body 91 which adjusts the tension | tensile_strength attitude | position of the string body 80 between the bonnet 6 and the winding means 82 is provided in the traveling body 2 side. Therefore, even if the winding means 82 is installed at an arbitrary position where the installation space can be secured, the posture in which the string body 80 avoids interference with a large number of parts arranged on the engine frame 13 and the operator It can be freely stretched in a posture that P is easy to grip.

  In the above embodiment, the opening / closing fulcrum shaft 63 is disposed on the rear side of the bonnet 6. However, the opening / closing fulcrum shaft 63 is disposed on the front side of the bonnet 6, and the rear side of the bonnet 6 is the leading end. You may apply this invention to the form rotated.

It is a side view of the tractor for farm work. It is a top view which shows arrangement | positioning of a tractor front part. It is a front view which shows the opening / closing structure of a bonnet, and the attachment structure of a string. It is a side view which shows the opening / closing structure of a bonnet. It is a front view which shows the opening / closing structure of a bonnet. It is a perspective view which shows a bonnet locking mechanism. It is a side view of the agricultural tractor of 2nd Embodiment. It is a side view which shows the attachment structure of a string. It is a front view which shows the attachment structure of a string.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tractor 2 Running body 5 Engine 6 Bonnet 6a Upper bonnet 6b Side bonnet 6c Lower bonnet 13 Engine frame 31 Rear support frame 32 Center support frame 33 Front support frame 63 Opening / closing fulcrum shaft 66 Gas spring 71 Bonnet hook 73 Bonnet lock mechanism 80 String body 82 Winding means

Claims (3)

In a work vehicle comprising a traveling machine body mounted with an engine and a bonnet covering the engine, the bonnet being configured to be rotatable around an opening / closing fulcrum shaft,
A string is provided as a grip when closing the bonnet,
The string body is connected to winding means for winding up the string body at one end side to the bonnet at the other end side,
The winding means is provided on the traveling machine body side,
A work vehicle configured such that the string body is pulled out from the winding means by an opening operation of the bonnet and wound by the winding means by a closing operation of the bonnet. The opening / closing fulcrum shaft is provided on the rear end side of the bonnet, a front support frame is provided on the front end side of the bonnet, and a bonnet hook attached to the front support frame is provided on the front end side of the traveling body. Configured to detachably engage with the hood lock mechanism,
The work vehicle according to claim 1, wherein one end side of the string body is connected to the front support frame. The work vehicle according to claim 1, wherein a guide body that adjusts a tension posture of the string body between the bonnet and the winding unit is provided on the traveling machine body side.

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