JP2017196987A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle, which is equipped with a lock mechanism for a bonnet for which releasee operation is prevented from being performed by other persons without impairing a convenience of a user.SOLUTION: A lock mechanism 31 comprises: a fixing member 32 to be fixed to a bonnet 6; a movable member 33 which is installed in a vehicle body frame 1 to be swingable between a lock position and a lock releasing position; an energizing member 34 which returns and energizes the movable member 33 to the lock position; and an operating member 37 which enables operation for the movable member 33 to swing to the lock releasing position. The movable member 33 comprises a hook part 33A which is hooked in the fixing member 32 and a receiving part 33B which receives release-operation force from the operating member 37. The operating member 37 is an attachable/detachable type having an insertion part 37A which can be inserted into/extracted from a penetration hole 40 of a cover unit A, where the insertion part 37A is provided with an operating part 37B which transmits the release-operation force to the receiving part 33B in a use state where the insertion part 37A is inserted into the penetration hole 40.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a work vehicle including a bonnet that can swing up and down with respect to a vehicle body frame, and a lock mechanism that fixes and holds the bonnet in a closed position below.

  The lock mechanism of the work vehicle includes a locking pin fixedly mounted on the bulkhead of the vehicle body frame, a lock bracket that is provided on the bonnet so as to be swingable between the lock position and the unlock position, and the lock bracket is returned to the lock position. And an operation lever that allows the lock fitting to be operated to the unlocking position against the action of the spring. The operation lever extends upward from the lock fitting and is formed on the upper surface of the bonnet. There is one that protrudes from the opening to the outside above the hood (for example, see Patent Document 1).

  In addition, the locked body that is fixedly mounted on the bonnet, the locking latch that is mounted on the fixing bracket of the body frame so as to be able to swing between the lock position and the unlocking position, and the locking lock body are returned to the locked position. A biasing spring that biases and an operating tool that allows the locking stopper to be operated to the unlocking position against the action of the biasing spring, and the operating tool extends laterally downward from the locking latch. There are some which protrude from the long hole formed in the lower cover of the vehicle body frame to the outside below the cover (see, for example, Patent Document 2).

Japanese Patent Laying-Open No. 2015-19612 (paragraph number 0031, FIGS. 4 and 6) JP2011-255695A (paragraph numbers 0018 to 0026, FIGS. 3 to 8)

In the configuration described in Patent Document 1, the bonnet is fixed and held at the closed position by swinging the protruding portion of the operating lever that protrudes from the bonnet opening to the outside above the hood in a direction that resists the action of the spring. Can be easily released.
In the configuration described in Patent Document 2, by pulling the protruding portion of the operation tool protruding from the long hole of the lower cover to the outside below the cover in a direction against the action of the biasing spring, the closed position of the bonnet is achieved. Can be easily released.

  On the other hand, in the configurations described in Patent Documents 1 and 2, since an operation tool or the like that allows the unlocking operation of the lock mechanism is partially protruded to the outside, if the protrusion is operated, Even a person other than the user can easily release the fixed holding of the hood at the closed position, and there is room for improvement in preventing the bonnet from being opened by others.

  That is, it is desired to provide a bonnet lock mechanism that is difficult for the other person to perform the release operation without impairing the convenience of the user.

As means for solving the above problems,
A work vehicle according to the present invention includes a bonnet that can swing up and down with respect to a vehicle body frame, and a lock mechanism that fixes and holds the bonnet in a closed position below.
The lock mechanism includes a fixed member fixedly mounted on one of the vehicle body frame and the bonnet, and a movable member mounted on the other of the vehicle body frame and the bonnet so as to be movable over a locked position and an unlocked position. An urging member that urges the movable member to return to the locked position, and an operation member that enables the movable member to operate to the unlocked position against the action of the urging member,
The movable member includes a hook portion that is hooked on the fixed member by being positioned at the lock position when the bonnet is positioned at the closed position, and a passive portion that receives a release operation force from the operation member,
The operating member is a detachable type having an insertion part that can be inserted into and removed from a through hole formed in a cover unit including the vehicle body frame or the bonnet, and in a use state in which the insertion part is inserted into the through hole, The insertion portion includes an operation portion that transmits the release operation force to the passive portion.

According to this means, when the user releases the fixed holding in the closed position of the bonnet, the user inserts the operation member insertion portion into the through hole of the body frame or the cover unit, and the operation member operation portion. By transmitting the release operation force from the movable member to the passive portion of the movable member, the movable member can be moved from the locked position to the unlocked position against the action of the biasing member. By this movement, the fixed holding at the closed position of the bonnet by the lock mechanism can be released.
In other words, the user who owns the operation member and knows how to use the operation member can easily release the fixed holding of the hood in the closed position by using the operation member. Also, others who do not own the operation member and do not know how to use the operation member cannot release the fixed holding of the hood in the closed position by the lock mechanism.
As a result, it is possible to make it difficult for the other person to perform the release operation by the hood fixedly held in the closed position by the lock mechanism without impairing the convenience of the user.

As one of the means for making the present invention more suitable,
The movable member is swingably supported by the body frame or the bonnet,
The lock mechanism includes a swinging member that is swingably supported by the vehicle body frame or the bonnet that supports the movable member, and a linkage member that spans the swinging member and the passive portion.
The swing member includes an operated portion that opposes the through hole and enables the operation member to press the swing member.

According to this means, when the user releases the fixed holding in the closed position of the bonnet, the user inserts the operation member insertion portion into the through hole of the body frame or the cover unit, and the operation member operation portion. The release operation force can be transmitted to the passive part of the movable member by pressing the operated part of the swinging member at, and the movable member is moved from the locked position to the unlocked position against the action of the biasing member. Can be moved to. By this movement, the fixed holding at the closed position of the bonnet by the lock mechanism can be released.
In other words, the user can easily release the fixed holding of the bonnet in the closed position by the lock mechanism by simply inserting the operating member into the through hole and pressing the operated portion of the swinging member. .
In this means, a general tool such as a screwdriver and a hexagon wrench that can be inserted into the through hole can be used as the operation member, thereby reducing the number of parts required for the lock mechanism. It becomes possible.

As one of the means for making the present invention more suitable,
The movable member is swingably supported by the body frame or the bonnet,
The lock mechanism includes a rotating member that is rotatably supported by the vehicle body frame or the bonnet that supports the movable member, and a linkage member that spans the rotating member and the passive portion.
The rotation member includes a connecting portion that is disposed at a position where the rotation center faces the through hole, and that is connected to the operation portion so as to be integrally rotatable at a portion facing the through hole. Yes.

According to this means, when the user releases the fixed holding in the closed position of the bonnet, the user inserts the operation member insertion portion into the through hole of the body frame or the cover unit, and the operation member operation portion. Can be transmitted to the passive part of the movable member by rotating the rotating member together with the operating member, and the movable member can be used as an urging member. Accordingly, it can be moved from the locked position to the unlocked position. By this movement, the fixed holding at the closed position of the bonnet by the lock mechanism can be released.
That is, the user can fix and hold the bonnet in the closed position by the lock mechanism by a simple operation of inserting the operation member into the through hole and connecting the rotation member to the rotation member and rotating the rotation member together with the operation member. It can be released easily.
In this means, depending on the shape of the connecting portion, it is possible to employ a general tool such as a screwdriver, a hexagon wrench, or a socket wrench having an operation portion that can be connected to the connecting portion. It is also possible to reduce the number of parts required for the lock mechanism.
Further, by adopting a rotation operation of the rotation member as the release operation, it is possible to make it difficult for another person to perform the release operation of the lock mechanism.

As one of the means for making the present invention more suitable,
The connecting portion is a groove-like portion extending through the rotation center of the rotation member and extending over the outer edge of the rotation member;
The operation portion is a protrusion that can be engaged with the groove-like portion.

According to this means, an operation member having a simple shape having a protrusion can be employed. Thereby, the cost required for the lock mechanism can be reduced.
And, for example, even when the rotating part is equipped with a vertical orientation in which the connecting part is located at the upper end of the rotating member, it is possible to prevent rainwater, washing water, etc. from collecting in the connecting part, It is possible to avoid the occurrence of rust at the connecting portion due to accumulation of rainwater and the like.

It is a left view of a tractor. It is a top view of a tractor. It is a vertical left view of the principal part which shows the state which a bonnet is located in a closed position. It is a vertical left view of the principal part which shows the state which a bonnet is located in an open position. It is a perspective view of the principal part which shows the structure regarding the fixation holding | maintenance of a bonnet. It is a vertical back view of the principal part which shows the state before fixed holding of the bonnet by a locking mechanism. It is a vertical back view of the principal part which shows the fixed holding state and fixed release state of a bonnet by a lock mechanism. It is a disassembled perspective view of the principal part which shows the structure of a locking mechanism. It is a vertical rear view of the principal part which shows the fixed holding state and fixed release state of the bonnet by the locking mechanism in another embodiment. It is a disassembled perspective view of the principal part which shows the structure of the locking mechanism in another embodiment.

  Hereinafter, as an example of an embodiment for carrying out the present invention, an embodiment in which the present invention is applied to a tractor that is an example of a work vehicle will be described with reference to the drawings.

The direction indicated by the arrow F shown in FIG. 1 is the front side of the tractor, and the direction indicated by the arrow U is the upper side of the tractor.
2 is the front side of the tractor, and the direction indicated by the arrow L is the left side of the tractor.

  As shown in FIGS. 1 and 2, the tractor exemplified in the present embodiment includes a vehicle body frame 1 that forms a framework of the vehicle body, a driving unit 2 disposed on the front side of the vehicle body frame 1, and a rear portion of the vehicle body frame 1. Located in front of the connected transmission unit 3, a riding type driving unit 4 located at the upper rear side of the vehicle body frame 1, a left and right traveling device 5, a swingable hood 6 that covers the driving unit 2, and the hood 6. A steel plate front guard 7 for protecting the hood 6 and the like, a protective frame 8 connected to the rear end of the vehicle body frame 1, and a mower 10 connected to the vehicle body frame 1 via a link mechanism 9 so as to be movable up and down, Etc. The tractor includes left and right front wheels 5A that can be steered and driven by power from the driving unit 2 and left and right rear wheels 5B that are driven by power from the driving unit 2 as the left and right traveling devices 5. It is configured as a four-wheel drive type. Further, the tractor is configured in a mid-mount type in which a mower 10 is provided in the lower abdomen between the left and right front wheels 5A and the left and right rear wheels 5B.

  As shown in FIGS. 1, 3, and 4, the vehicle body frame 1 includes a left and right side member 11 made of a long steel plate, a front end member 12 made of a steel plate that extends over the front ends of the left and right side members 11, and a left and right side member. The center pillar 13 is connected to the front and rear center sides of the left and right side members 11, and the left and right brackets 14 are connected to the front end portions of the left and right side members 11.

  As shown in FIGS. 1 to 5, the prime mover 2 includes a water-cooled engine 15 that is supported in an anti-vibration manner at the front portion of the body frame 1, a muffler 16 that is disposed in a left-right orientation in front of the engine 15, A cooling fan 17 disposed behind, a radiator 18 disposed behind the cooling fan 17, an air cleaner 19 disposed above the engine 15, and the like are provided. The front side of the driving part 2 is covered with the bonnet 6, the upper side of the rear end part is covered with the upper panel 20, and the lower side of the rear end part is covered with the under panel 21. That is, the bonnet 6, the upper panel 20, and the under panel 21 constitute a cover unit A that covers substantially the entire driving unit 2.

  The driving unit 4 includes a steering wheel 22 for front wheel steering, a display panel 23 for displaying the engine speed, a driving seat 24 disposed above the transmission unit 3, and the like.

The bonnet 6 includes a steel plate bonnet frame 25 that forms the framework of the bonnet 6, a front cover 26 that covers the front end of the driving unit 2, left and right side covers 27 that cover the lateral sides of the driving unit 2, and an upper portion of the driving unit 2. The upper cover 28 and the headlight unit 29, etc., which are integrally connected, are opened and closed and swinged with a left and right support shaft 30 positioned at the front end of the vehicle body frame 1 as a fulcrum. The bonnet frame 25 includes left and right connecting portions 25A at the lower end portion of the front end portion thereof. The left and right connecting portions 25 </ b> A are connected to the left and right brackets 14 of the vehicle body frame 1 via left and right bolts 30 that function as left and right support shafts 30.
As a result, the bonnet 6 can swing up and down with respect to the vehicle body frame 1 over a lower closed position and an upper open position, and is configured in a rear opening type in which the rear side of the prime mover 2 is largely released at the open position. ing. As a result, it is easy to perform maintenance on the radiator 18 and the air cleaner 19 that are arranged on the rear side of the prime mover 2.

  As shown in FIGS. 3 to 8, the tractor includes a lock mechanism 31 that fixes and holds the bonnet 6 in the lower closed position. The lock mechanism 31 is interlocked with the swinging operation of the bonnet 6 to the closed position, and the lock unit 31A that fixes and holds the bonnet 6 at the closed position, and the unlocking operation of the bonnet 6 that is fixedly held at the closed position by the lock unit 31A. Is provided with a release unit 31B.

The lock unit 31A is swingable between an L-shaped fixing rod (an example of a fixing member) 32 fixed to the bonnet frame 25 of the bonnet 6 and the center pillar 13 of the vehicle body frame 1 between a lock position and a lock release position. A movable member 33 to be equipped and a tension spring (an example of a biasing member) 34 for biasing the movable member 33 back to the lock position are provided.
The fixed rod 32 is provided at the rear end of the left and right center of the bonnet 6 with the front and rear hooking portions 32A. The middle part of the movable member 33 is attached to the left and right central part of the support member 36 fixed to the upper part of the center pillar 13 by means of a front-rear facing bolt 35 or the like serving as a swing fulcrum of the movable member 33. The movable member 33 is set in a vertical orientation at the locked position and in a right inclined posture at the unlocked position. On the upper part of the movable member 33, a hook portion 33 </ b> A that is hooked on the hook portion 32 </ b> A of the fixed rod 32 by being positioned at the lock position when the bonnet 6 is positioned at the closed position is provided. A passive portion 33B that receives a release operation force from the release unit 31B is provided below the movable member 33. The hook portion 33A includes a cam portion 33C that enables a swing operation of the fixed rod 32 to the unlocking position by the hook portion 32A. The tension spring 34 is constructed from the right end portion of the support member 36 to the passive portion side of the movable member 33.
The center pillar 13 includes a recessed portion 13A that allows the hook portion 32A to be inserted and removed when the bonnet 6 is swung at the upper left and right central portions adjacent to the rear of the hook portion 33A in the locked position. The upper panel 20 is provided with a recess 20 </ b> A that allows the hook portion 32 </ b> A to pass through the swing operation of the bonnet 6 in the upper left and right central portions where the recess 13 </ b> A of the center pillar 13 is adjacent to the lower side.
With the above-described configuration, when a user such as a driver swings the bonnet 6 to the closed position, the hook portion 32A on the bonnet side passes through the concave portion 20A of the upper panel 20 and the concave portion 13A of the center pillar 13 is obtained. To contact the cam portion 33 </ b> C of the movable member 33. As a result of this contact, the movable member 33 retreats and swings from the locked position to the unlocked position against the action of the tension spring 34. Thereafter, when the hook portion 32A moves below the cam portion 33C as the bonnet 6 reaches the closed position, the movable member 33 returns to the locked position by the action of the tension spring 34 along with the movement. The hook portion 33A is hooked on the hook portion 32A.
That is, a user such as a driver can hold the bonnet 6 in the closed position by the action of the lock mechanism 31 by a simple operation of swinging the bonnet 6 to the closed position.

The release unit 31B has an L-shaped operation rod (an example of an operation member) 37 that allows the movable member 33 to be operated to the unlocked position against the action of the tension spring 34, and the center pillar 13 around the vertical axis. A shaft-like turning member 38 that is rotatably supported, and a connecting rod (an example of a connecting member) 39 that extends between the turning member 38 and the movable member 33 are provided. The operation rod 37 is a detachable type having an insertion portion 37A that can be inserted into and removed from a through hole 40 formed at the left front end portion of the upper panel 20, and in a use state in which the insertion portion 37A is inserted into the through hole 40 of the upper panel 20. The insertion portion 37 </ b> A includes an operation portion 37 </ b> B that transmits the release operation force to the passive portion 33 </ b> B of the movable member 33 via the rotation member 38 and the linkage rod 37. The rotation member 38 is provided at a position where the rotation center faces the through hole 40 of the upper panel 20, and the operation portion 37 </ b> B of the operation rod 37 can be integrally rotated at the upper end portion facing the through hole 40. A connecting portion 38A to be connected is provided.
With the above configuration, when a user such as a driver releases the fixed holding of the bonnet 6 at the closed position, the insertion portion 37A of the operation rod 37 is inserted into the through hole 40 of the upper panel 20 and the operation rod 37 is inserted. After the operating portion 37B is connected to the connecting portion 38A of the rotating member 38, the operating member 37 and the rotating member 38 are rotated about the longitudinal axis, whereby the release operating force is applied to the passive portion 33B of the movable member 33. The movable member 33 can be swung from the locked position to the unlocked position against the action of the tension spring 34. And by this rocking | fluctuation, the fixed holding | maintenance in the closed position of the bonnet 6 by the lock mechanism 31 can be cancelled | released.
That is, a user such as a driver inserts the operation rod 37 into the through hole 40 and connects it to the rotation member 38, and rotates the rotation member 38 together with the operation rod 37. Thus, the fixed holding of the bonnet 6 at the closed position can be easily released.
Further, it is possible to avoid the possibility that the locking mechanism 31 releases the fixed holding of the bonnet 6 in the closed position by another person who does not own the operation rod 37 and does not know how to use the operation rod 37.

  The rotating member 38 has a connecting portion 38A formed in a large-diameter head portion 38B, and a vertically long shaft portion 38C formed in a smaller diameter than the head portion 38B. The boss portion 13B provided in the upper left portion of the center pillar 13 Is rotatably supported. A nut 41 for retaining is attached to a male screw portion 38D formed at the lower end portion of the rotating member 38. Further, the arm portion 38E fixed to the head portion 38B is interlocked and connected to the passive portion 33B of the movable member 33 via the linkage rod 39.

As shown in FIGS. 7 and 8, the connecting portion 38 </ b> A of the rotation member 38 is formed in a single-letter groove-like portion extending through the rotation center of the rotation member 38 and extending over the outer peripheral edge of the rotation member 38. . The operating portion 37B of the operating rod 37 is formed as a single-character ridge that can be engaged with a connecting portion 38A formed in the groove-like portion.
With the above configuration, the operation rod 37 having a simple shape having the operation portion 37B formed on the protruding portion can be employed. Thereby, the cost required for the lock mechanism 31 can be reduced.
Then, it is possible to prevent rainwater, washing water, and the like from collecting in the connecting portion 38A of the rotating member 38, and to prevent the occurrence of rust at the connecting portion 38A due to the accumulation of rainwater and the like.

  As shown in FIGS. 1 to 7, the upper panel 20 is detachably equipped with a rubber cap 42 that closes the through hole 40. That is, by removing the cap 42 from the upper panel 20, it is possible to release the fixed holding of the bonnet 6 in the closed position by the lock mechanism 31.

As shown in FIGS. 5 to 7, the bonnet 6 includes left and right compression springs 43 received and supported by the center pillar 13 via the upper panel 20. The left and right compression springs 43 push the bonnet 6 upward from the closed position as the lock mechanism 31 releases the fixed holding of the bonnet 6 in the closed position, and release the lock slightly above the closed position. Receive and hold in position. The left and right compression springs 43 allow swinging displacement of the bonnet 6 to the closed position by swinging the bonnet 6 downward against the action.
As a result, the bonnet 6 remains in the closed position even after the unlocking operation of the locking mechanism 31, and the bonnet 6 is again moved by the locking mechanism 31 with the return of the movable member 33 to the locking position after the releasing operation. It is possible to prevent the inconvenience of being fixedly held in the closed position. In addition, in the state where the bonnet 6 is fixedly held in the closed position, it is possible to prevent inconvenience that the rear end portion of the bonnet 6 rattles.

As shown in FIGS. 1, 3, and 4, the tractor includes an assist unit 44 that assists the opening operation of the hood 6. The assist unit 44 includes a guide member 45 having a guide hole 45 </ b> A facing in the front-rear direction and fixed to the vehicle body frame 1, a linkage rod 46 extending between the guide member 45 and the bonnet frame 25, and a linkage rod 46 extending over the vehicle body frame 1. A gas spring 47 is provided. The opening operation of the bonnet 6 is assisted by the extension operation of the gas spring 47.
Thus, a user such as a driver can easily open and close the heavy bonnet 6 in which the front cover 26 and the left and right side covers 27 are integrally opened and closed by the action of the assist unit 44. .

  As shown in FIGS. 1 and 2, the protective frame 8 has a tool box 52 attached to the left frame portion. Thereby, the operation rod 37 of the lock mechanism 31 can be stored in the tool box 52 during operation.

[Another embodiment]
The present invention is not limited to the configuration exemplified in the above-described embodiment, and typical other embodiments relating to the present invention will be exemplified below.

[1] The work vehicle may adopt the following configuration.
For example, the work vehicle may be configured to have a crawler specification including left and right crawlers instead of the left and right rear wheels 5B.
For example, the work vehicle may be configured in a full crawler specification including left and right crawlers instead of the left and right front wheels 5A and the left and right rear wheels 5B.
For example, the work vehicle may be configured to include an air-cooled engine 15.
For example, the work vehicle may be configured to have an electric specification including an electric motor instead of the engine 15.
For example, the work vehicle may be configured in a hybrid specification including the engine 15 and an electric motor.
For example, the work vehicle may be configured to include an exhaust treatment device having a DPF (diesel particulate collection filter).
For example, the work vehicle may be configured to include the bonnet 6 on the rear side of the body frame 1.
For example, the work vehicle may be configured without the front guard 7.

[2] The configuration of the bonnet 6 can be variously changed.
For example, the bonnet 6 may be configured as a front opening type that largely releases the front side of the driving unit 2 at the opening position.
For example, in the bonnet 6, the bonnet frame 25 other than the left and right side covers 27, the front cover 26, the upper cover 28, the headlight unit 29, and the like are integrally connected, and the left and right side covers 27 are left. It may be configured to swing up and down.
For example, the bonnet 6 may be configured such that only the upper cover 28 swings up and down.

[3] The structure shown in FIGS. 9 and 10 may be adopted for the lock mechanism 31.
In this configuration, the lock mechanism 31 is rocked integrally with the swing member 49 via the rotary shaft 48 and the swing member 49 supported by the center pillar 13 so as to be swingable in the left-right direction via the rotary shaft 48 facing forward and backward. And a linkage rod (an example of a linkage member) 51 extending between the linkage arm 50 and the passive portion 33B of the movable member 33.
The swing member 49 opposes the through hole 40 of the upper panel 20 and allows the swing member 49 to be pressed by the operation portion 37B of the operation rod (example of operation member) 37. ).
With the above configuration, when a user such as a driver releases the fixed holding of the bonnet 6 at the closed position, the insertion portion 37A of the operation rod 37 is inserted into the through hole 40 of the upper panel 20 and the operation rod 37 is inserted. The release operation force can be transmitted to the passive portion 33B of the movable member 33 by pressing the concave portion 49A of the swinging member 49 with the operation portion 37B. Can be swung from the locked position to the unlocked position. And by this rocking | fluctuation, the fixed holding | maintenance in the closed position of the bonnet 6 by the lock mechanism 31 is cancelable | released.
That is, a user such as a driver can hold and fix the hood 6 in the closed position by the lock mechanism 31 by simply inserting the operation rod 37 into the through hole 40 and pressing the recess 49A of the swing member 49. Can be easily released.
Further, it is possible to avoid the possibility that the locking mechanism 31 releases the fixed holding of the bonnet 6 in the closed position by another person who does not own the operation rod 37 and does not know how to use the operation rod 37.

[4] The arrangement of the lock mechanism 31 can be variously changed in accordance with the swing fulcrum position and configuration of the bonnet 6.
For example, if the bonnet 6 is a front opening type in which the entirety of the bonnet 6 swings up and down, the lock mechanism 31 may be provided near the lower part of the front end of the bonnet 6 located at the closed position.
For example, if the bonnet 6 is a front opening type in which only the upper cover 28 swings up and down, the lock mechanism 31 may be provided in the vicinity of the upper part of the front end of the bonnet 6 located at the closed position.

[5] The configuration of the lock mechanism 31 can be variously changed.
For example, the lock mechanism 31 may be configured such that the passive portion 33B of the movable member 33 is directly operated by the operation portion 37B of the operation member 37.
For example, the lock mechanism 31 may be configured such that the fixed member 32 is fixedly mounted on the vehicle body frame 1 and the movable member 33 is mounted on the hood 6 so as to be movable.
For example, the lock mechanism 31 may be configured to include a fixing member 32 formed in a U shape or a single character.
For example, the lock mechanism 31 may be configured to include a fixing member 32 that employs a steel pipe material or a steel strip material.
For example, the lock mechanism 31 may include a movable member 33 that swings up and down over a lock position and a lock release position.
For example, the lock mechanism 31 may include a movable member 33 that slides between a lock position and a lock release position.
For example, the lock mechanism 31 may include a biasing member 34 that employs a torsion spring or a compression spring.
For example, the lock mechanism 31 may be configured to include an operation member 37 formed in a T shape or a single character.
For example, the lock mechanism 31 may be configured to include an operation member 37 in which a steel pipe material or a strip steel material is employed.
For example, the lock mechanism 31 may be configured to include a general tool such as a driver, a hexagon wrench, or a socket wrench, an ignition key, or the like as the operation member 37.
For example, the lock mechanism 31 may be configured to include the linkage member 39 or the linkage member 51 in which a steel pipe material or a steel strip material is employed.
For example, the lock mechanism 31 may include a swing member 49 that swings up and down or swings back and forth.
For example, the lock mechanism 31 may be configured to include a rotating member 38 that rotates about the horizontal axis centering in the left-right direction or the front-rear direction.
For example, the lock mechanism 31 may include a cylindrical rotating member 38.

[6] The shape of the operating portion 37B of the operating member 37 and the connecting portion 38A of the rotating member 38 can be variously changed.
For example, the connecting portion 38A may be a single-character ridge portion, and the operation portion 37B may be a single-character groove-like portion that is fitted to the ridge portion.
For example, the connecting portion 38A may be a square shaft portion such as a rhombus, a square, or a hexagon, and the operation portion 37B may be a square hole portion that fits the square shaft portion.
For example, the connecting portion 38A may be an elliptical shaft portion, and the operation portion 37B may be an elliptical hole portion that fits into the elliptical shaft portion.
For example, the connecting portion 38A may be a square hole portion such as a rhombus, a square, or a hexagon, and the operation portion 37B may be a square shaft portion that is fitted to the square hole portion.
For example, the coupling part 38A may be an elliptical hole part, and the operation part 37B may be an elliptical shaft part that fits into the elliptical hole part.
For example, the connecting portion 38A may be a cross hole, and the operation portion 37B may be a cross shaft that fits into the cross hole.

[7] The shape of the operated portion 49A of the swing member 49 can be variously changed.
For example, the operated portion 49A may have a shape having an operated surface that is easily pressed by the operating portion 37B of the operating member 37.

[8] The position of the through hole 40 into which the operation member 37 is inserted can be variously changed according to the arrangement of the lock mechanism 31 and the like.
For example, in a configuration in which the lock mechanism 31 is provided near the lower front end of the bonnet 6 positioned at the closed position, the through hole 40 is formed in the frame portion of the vehicle body frame 1 positioned near the lower front end of the bonnet 6 or the front of the bonnet 6. The cover 26 may be provided.
For example, in a configuration in which the lock mechanism 31 is provided near the upper rear end of the bonnet 6 located at the closed position, the through hole 40 may be provided in the upper rear end of the bonnet 6.

  The present invention is applied to work vehicles such as a tractor, a front loader, a mower, a rice transplanter, a combiner, a wheel loader, and a backhoe, which are provided with a lock mechanism that fixes and holds the bonnet in a closed position below. Can do.

DESCRIPTION OF SYMBOLS 1 Body frame 6 Bonnet 31 Lock mechanism 32 Fixed member 33 Movable member 33A Hook part 33B Passive part 34 Energizing member 37 Operation member 37A Insertion part 37B Operation part 38 Rotation member 38A Connection part 39 Linking member 40 Through-hole 49 Oscillation Member 49A Operated part 51 Linking member A Cover unit

Claims (4)

A bonnet that can swing up and down with respect to the vehicle body frame, and a lock mechanism that fixes and holds the bonnet in a closed position below,
The lock mechanism includes a fixed member fixedly mounted on one of the vehicle body frame and the bonnet, and a movable member mounted on the other of the vehicle body frame and the bonnet so as to be movable over a locked position and an unlocked position. An urging member that urges the movable member to return to the locked position, and an operation member that enables the movable member to operate to the unlocked position against the action of the urging member,
The movable member includes a hook portion that is hooked on the fixed member by being positioned at the lock position when the bonnet is positioned at the closed position, and a passive portion that receives a release operation force from the operation member,
The operating member is a detachable type having an insertion part that can be inserted into and removed from a through hole formed in a cover unit including the vehicle body frame or the bonnet, and in a use state in which the insertion part is inserted into the through hole, A work vehicle in which the insertion portion includes an operation portion that transmits the release operation force to the passive portion. The movable member is swingably supported by the body frame or the bonnet,
The lock mechanism includes a swinging member that is swingably supported by the vehicle body frame or the bonnet that supports the movable member, and a linkage member that spans the swinging member and the passive portion.
The work vehicle according to claim 1, wherein the swing member includes an operated portion that opposes the through-hole and enables the operation member to press the swing member. The movable member is swingably supported by the body frame or the bonnet,
The lock mechanism includes a rotating member that is rotatably supported by the vehicle body frame or the bonnet that supports the movable member, and a linkage member that spans the rotating member and the passive portion.
The rotation member includes a connecting portion that is disposed at a position where the rotation center faces the through hole, and that is connected to the operation portion so as to be integrally rotatable at a portion facing the through hole. The work vehicle according to claim 1. The connecting portion is a groove-like portion extending through the rotation center of the rotation member and extending over the outer edge of the rotation member;
The work vehicle according to claim 3, wherein the operation portion is a protrusion that can be engaged with the groove-like portion.

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