JP5427115B2 - Bonnet lock device for work vehicle - Google Patents

Description

  The present invention provides a bonnet lock for a work vehicle in which a bonnet configured to be swingable up and down around a swinging fulcrum on the vehicle body side is configured to be detachable with respect to a body part on the side opposite to the swinging fulcrum. Relates to the device.

  As described above, as a bonnet locking device for a work vehicle in which the swing end side of the bonnet is configured to be freely disengaged, the one described in [1] or [2] below is known.

[1] A fixing bracket attached to the vehicle body side and a retaining locking body capable of locking the locked body on the bonnet side are provided, and the retaining locking body is biased toward the retaining action posture side. A force spring and an operation tool for operating the retaining locking body to the retaining release side, and an elastic body for slightly lifting the bonnet when the retaining mechanism is released (see Patent Document 1).
[2] A fixing bracket attached to the bonnet side and a retaining member capable of retaining the body to be engaged on the vehicle body are provided, and the retaining member is biased toward the retaining action posture side. A force spring and an operating tool for operating the retaining locking body toward the retaining release side, and further comprising an operating body and an elastic body for slightly lifting the bonnet when the retaining mechanism is released (see Patent Document 2) .

JP-A-8-26140 (see paragraph numbers [0013], [0014], [0015], FIG. 1, FIG. 2, FIG. 3) Japanese Utility Model Publication No. 6-35557 (see paragraph numbers [0008], [0009], FIG. 1, FIG. 2, FIG. 3)

In the conventional apparatus described in [1] and [2] above, there is provided means for slightly lifting the bonnet as the retaining release operation is performed. It is useful in that it can be used conveniently when it is placed and lifted.
However, in the case of a work vehicle, the bonnet cannot be lifted unless the bonnet is lifted to form a sufficient gap between the vehicle body and the unevenness present on the bonnet side or the vehicle body side. There is also a structure that can open and close the bonnet using a part or the like.

In this case, if the means for slightly lifting the bonnet is omitted, there is an advantage that the structure can be further simplified, but if the means for slightly lifting the hood in the conventional structure is omitted, Even if the operation for releasing the engagement of the bonnet is performed, the position of the locked body on the bonnet side does not change.
For this reason, if a means for slightly lifting the bonnet is omitted, there is an inconvenience that the bonnet lifting operation must be performed while continuing the disengagement operation.

  The object of the present invention is to eliminate the means for slightly lifting the bonnet in accordance with the release of the retaining latch, and to maintain the release operation state of the retaining latch even if the retaining release is stopped. An object of the present invention is to provide a hood lock device for a work vehicle that can improve the operability.

In order to solve the above problems, the bonnet locking device for a work vehicle according to the present invention employs the following technical means.
[Solution 1]
According to a first aspect of the present invention, the bonnet configured to be swingable up and down around the swinging fulcrum on the vehicle body side is configured to be freely engageable and disengageable with respect to the body part on the side opposite to the swinging fulcrum. A hood lock device for a work vehicle,
A locked body is provided on one side of the bonnet side or the vehicle body side, a fixing bracket on the other side, a retaining latch body that can latch the latched body, and the retaining latch body are removed. An urging spring for urging the stopper acting posture side,
The fixing bracket can be engaged / disengaged from the one side in the up / down direction with the locked body provided on the one side, and in a horizontal direction intersecting with the locking / disengaging direction of the locked body in the engaged state. An engagement recess that restricts movement is formed,
The retaining locking body includes a retaining protrusion that restricts the locking body engaged in the engaging recess of the fixing bracket in a retaining posture and restricts the retaining member in the vertical direction. It is configured so that the posture can be freely switched to a retaining release posture that allows the locked body to be removed by retreating from the vertical position of the engaging recess.
Further, the retaining locking body includes a release position holding portion that engages with the locked body when the posture is switched to the retaining release releasing posture. Due to the weight of the bonnet side loaded at the contact location between the body and the release position holding portion, the retaining spring body moves toward the retaining action posture side against the biasing force toward the retaining action posture side of the biasing spring. It is characterized by being configured to prevent the return of the above.

[Operation and effect of invention according to Solution 1]
As described above, the retaining member is provided with a release position holding portion that is engaged with the subject to be engaged when the posture is switched to the retaining release posture. Then, in this release position holding portion, the movement of the retaining locking body urged toward the retaining action posture side by the urging force of the urging spring is applied to the contact portion between the locked body and the release position holding portion. This is prevented by allowing the weight on the bonnet side to be loaded.
Therefore, in the state where the weight of the bonnet is acting on the contact position between the locked body and the release position holding part at the release position holding part, even if the release release operation for the stop lock body is stopped, The body does not return to the retaining posture position.
Then, when the weight on the bonnet side with respect to the release position holding portion is removed, the retaining latch body returns to the retaining action posture side by the action of a biasing spring that biases the retaining latch body to the retaining action posture side. .

  Therefore, the structure of the bonnet locking device can be simplified by omitting the means for slightly lifting the bonnet along with the release of the locking stopper, and when the bonnet is lifted. In addition, there is no need for an inconvenient operation such as lifting the bonnet while performing the unlocking release operation on the retaining locking body. Even if the operation is stopped, since the release preventing release state with respect to the retaining locking body is maintained, there is an advantage that the bonnet can be lifted up with both hands.

[Solution 2]
The other technical means of the present invention taken in order to solve the above-mentioned problems are as described in claim 2 in the contact position of the engaging recess with the locked body and the locking release posture of the locking latch. The contact position with respect to the release position holding portion is characterized by being the same height position.

[Operation and effect of invention according to Solution 2]
As described above, since the contact position of the engagement recess with respect to the locked body and the contact position with respect to the release position holding portion in the locking release posture of the locking latch body are the same height position, the locking latch body When the unlocking release operation is performed, there is no need to greatly change the vertical positional relationship between the locked body from the state where the locked body is positioned in the engaging recess. It is only necessary to position the locked body in the release position holding portion by operating the locking mechanism from the positioned locking mechanism to the locking release position.
At this time, the contact position of the engagement recess with respect to the locked body and the contact position with respect to the release position holding portion in the locking release posture of the retaining lock body are at the same height position. Only a small amount of vertical movement is required when shifting from the stop action posture side to the release position holding portion. For this reason, there is an advantage that the releasing operation can be performed relatively easily without being affected by the weight of the bonnet without using a means for urging the bonnet in the lifting direction.

It is a side view of a tractor. It is a whole side view of a bonnet part. It is a front view of a bonnet part. It is a top view of a bonnet locking device. It is a front view of a bonnet locking device. The bonnet locking device is shown, (a) is a perspective view seen from the front left side, (b) is a perspective view seen from the rear left side. It is a disassembled perspective view of a bonnet locking device. It is explanatory drawing which shows the action | operation state of a bonnet locking device, (a) shows the retaining action attitude | position, (b) shows the retainer release attitude | position, (c) has shown the bonnet open | released state. It is explanatory drawing which shows the action | operation state of the bonnet lock apparatus in another embodiment, (a) shows the retaining action attitude | position, (b) shows the retainer release attitude | position, (c) has shown the bonnet open | released state. . It is the perspective view which looked at the bonnet locking device in another embodiment from the front right side. It is a side view which shows the bonnet locking device in another embodiment, (a) is the side view which looked at the structure of another embodiment in FIG. 10 from the left side, (b) is the structure of another embodiment in FIG. It is the side view which changed a part and was seen from the left side.

Hereinafter, an example of an embodiment of the present invention will be described based on the drawings.
[Overall structure of tractor]
FIG. 1 shows a tractor to which a hood lock device for a work vehicle according to the present invention is applied.
This tractor includes a self-propelled vehicle body 1 composed of an engine mounting frame 10, an intermediate transmission case 11, and a rear mission case 12, and a pair of left and right front wheels 13 that support the engine mounting frame 10 and that can be steered. The rear transmission case 12 is supported by a rear wheel 14 that supports the rear mission case 12 side.
A driving unit 2 is provided on the front side of the self-propelled vehicle body 1, and a control tower 16 and a steering seat 17 having a steering handle 15 are provided on the rear side of the driving unit 2. A work machine such as a rotary tiller (not shown) is connected to the rear of 1 by a lift arm 18 and a link mechanism 19 so as to be lifted and lowered.

(Moving part)
In the prime mover 2, a bonnet 21 is provided so as to cover the engine 20 mounted on the engine mounting frame 10 and an engine accessory such as a cooling radiator, an air cleaner, and a battery (not shown). A lower cover 10A is provided at the front portion of the engine mounting frame 10, and the lower side of the front portion of the engine bonnet 21 is covered by the lower cover 10A.
The bonnet 21 is pivotally attached to the rear frame 22 erected at a connection position with the control tower 16 so that the rear end side thereof can swing up and down around a horizontal axis x1 (corresponding to a swing fulcrum). The front grille 21b is provided at the front side portion of the top plate portion 21a, and the lateral wall portion 21c is provided on the left and right lateral sides. A light for irradiating the front is provided on the upper portion of the front grill 21b. The front grille 21b is supported on the top plate portion 21a side by a band plate-like stay 21A extending downward from the lower surface side of the front end portion of the top plate portion 21a.

As shown in FIGS. 2 and 3, a portal-shaped fixing frame 23 for mounting various accessory devices is erected from the lower cover 10 </ b> A on the engine mounting frame 10 side in the internal space of the bonnet 21. A stopper fitting 24 is attached to the upper left part of the frame 23 (the right side in FIG. 3).
The stopper bracket 24 is provided with a support stay 25 for preventing the bonnet 21 from returning to the closed side when the bonnet 21 is swung upward around the horizontal axis x1 on the rear end side to be in an open posture. The lower end side can be locked and unlocked, and a locking hole 24a is formed at the upper end of a plate-like member bent into a crank shape.

On the other hand, the support stay 25 is composed of a rod-like member, and its upper end is bent in the left-right direction, and is inserted into a pivotal support hole 26 a formed in the upper attachment piece 26 in the bonnet 21. The portion bent in the left-right direction inserted into the pivot hole 26a is set as a horizontal axis x2 in the left-right direction, and is pivoted around the horizontal axis x2 so as to be swingable back and forth, and the lower end side is hook-like It is formed so as to be bent and disengaged with respect to the locking hole 24a.
Note that, in the attachment portion of the support stay 25 to the bonnet 21, a fitting portion between the left and right bent portion that becomes the left and right horizontal axis x 2 and the pivot hole 26 a into which the left and right bent portion is inserted. Is configured so that the position of the lower end side can be slightly changed also in the left-right direction.

[Bonnet lock device]
A bonnet locking device 3 is provided on a body portion on the opposite side of the horizontal axis x1 serving as a swing fulcrum of the bonnet 21, that is, a front end portion of the self-propelled vehicle body 1.
As shown in FIGS. 3 to 7, the bonnet locking device 3 is provided on the bonnet 21 side and the fixing bracket 4 attached to the lower cover 10 </ b> A on the engine mounting frame 10 side constituting the self-propelled vehicle body 1. A round bar-like locked body 30, a retaining latch 5 that can latch the latched body 30, and a biasing spring 31 that constantly biases the retaining latch 5 toward the retaining posture. It is configured with.
The to-be-latched body 30 is connected to a lower portion of a strip-like stay 21A extending from the top plate portion 21a side to the lower side, and is connected to a support member 21B that supports the lower end portion of the front grille 21b. .

The fixing bracket 4 is formed with an engaging recess 40 at the center in the left-right direction so that the locked body 30 of the bonnet 21 can be engaged and disengaged from above. On both the left and right sides of the engaging recess 40, inclined surfaces 41 are formed so as to be higher away from the engaging recess 40, and the locked body 30 on the bonnet 21 side is reliably guided into the engaging recess 40. It is configured to be.
Then, on one end side (right side in FIG. 5) of the fixing bracket 4 in the left-right direction, there is provided a notch portion 42 for defining an operating range with which a stopper pin 53 provided on the retaining member 5 to be described later contacts. It is provided so that the retaining action posture and the retaining release posture of the retaining member 5 can be positioned by the upper edge 42u and the lower edge 42d of the notch 42.
That is, in FIG. 5, the state where the stopper pin 53 provided on the retaining member 5 is in contact with the upper edge 42u side of the notch portion 42 as shown by the solid line is the retaining action posture. As shown in FIG. 2, the stopper pin 53 provided on the retaining member 5 is in contact with the lower end edge 42d side of the notch 42 is the retaining prevention release posture.

The retaining locking body 5 is pivotally supported around the pivot shaft 50 with respect to the fixing bracket 4, and the posture can be freely changed between the retaining action posture and the retaining release posture as described above. It is configured.
The retaining locking body 5 is positioned above the locked body 30 engaged with the engaging recess 40 of the fixing bracket 4 in a retaining action posture so as to restrict the upward slipping. A formed retaining protrusion 51 is provided. On the upper side of the retaining protrusion 51, the retaining locking body 5 itself is released and released by contact with the locked body 30 that moves downward so as to engage with the engaging recess 40 from above. An inclined surface 52 is provided for applying a component force to rotate the posture side. The above-described stopper pin 53 is also integrally attached to the retaining member 5 and is provided so as to protrude into the notch portion 42 of the fixing bracket 4.

In addition, the retaining member 5 is provided with a release position holding portion 54 with which the body 30 is engaged when the posture is changed to the retaining posture.
The release position holding portion 54 is a retaining locking body against the biasing force toward the retaining posture by the biasing spring 31 due to the weight of the bonnet 21 loaded via the locked body 30. 5 is used to maintain the release prevention posture of 5 and prevent return to the release prevention posture side.
That is, the bottom portion 54b (corresponding to the lowest position) of the release position holding portion 54 is at the same height position as the bottom portion 40a (corresponding to the lowest position) of the engaging recess 40 in the retaining release posture shown by the phantom line in FIG. In the state where the weight of the bonnet 21 is acting on the bottom portion 54b, the biasing spring 31 is cooperated with the movement restricting portion 54a existing on the side of the bottom portion 54b (the right side of FIG. 5). The retaining engagement releasing body 5 is configured to maintain the retaining engagement releasing posture against the urging force toward the retaining posture.

The urging spring 31 has hook portions on both end sides, one end side is locked to a fixing bracket 10a provided on the lower cover 10A, and the other end side is formed on the retaining locking body 5 for locking. Locked in the hole 55.
The long hole 55 for locking is along the direction in which the longitudinal direction coincides with the tensioning direction of the biasing spring 31 when the retaining locking body 5 is in the retaining action posture. The hook portion of the urging spring 31 is configured to be easily engaged with the urging force of 31 being small.
The imaginary line segment L1 in the direction in which the urging force connecting both ends of the urging spring 31 acts is connected to the one end side of the urging spring 31 that is locked to the fixing bracket 10a on the lower cover 10A and the retaining member. Since it exists only on the upper side of the imaginary line segment L0 that connects the center of the pivot shaft 50 that is the center of swinging of the stationary body 5, it does not move downward beyond the center of the pivot shaft 50. The urging force of the urging spring 31 is configured so that the retaining member 5 always acts on the side of the retaining posture around the pivot shaft 50.

A connection hole 56 for connecting the operation tool 32 for manual operation is provided at the upper end of the retaining member 5. The lower cover 10A is formed with a left and right elongated hole 10B, and the operation tool 32 is in a state where the operation portion 32a of the operation tool 32 connected to the connection hole 56 is located below the lower cover 10A. Is disposed over the inside and outside of the lower cover 10A in a slanting downwardly inclined posture in front view through the long hole 10B.
Therefore, by connecting the operating tool 32 to the connecting hole 56 and pushing and pulling, the operating portion 32a of the operating tool 32 is operated from the laterally outer side of the front of the vehicle body, and the retaining locking body 5 is prevented from coming off. The posture can be changed between the posture and the retaining release releasing posture with a simple operation.

FIG. 8 shows an operation for locking and unlocking the hood 21 using the hood lock device 3 of the present invention.
That is, in FIG. 8A, the locked body 30 on the bonnet 21 side enters the engaging recess 40 of the fixing bracket 4, and the locking projection 51 of the locking locking body 5 is positioned above the locking recess 4. The state is maintained by the pulling action of the biasing spring 31. That is, it shows a state in which the retaining posture is maintained.

FIG. 8B shows a state in which the manipulating operation tool 32 is pulled against the urging force of the urging spring 31 and the retaining locking body 5 is switched to the retaining release posture.
In this state, a return biasing force toward the return side of the biasing spring 31, that is, the retaining action posture side is acting on the retaining latching body 5, but the latched body 30 on the bonnet 21 side is the release position holding portion. 54, the bonnet weight is acting. In order for the locked body 30 to exceed the movement restricting portion 54a in this state, it is necessary to apply a force that can overcome the movement resistance due to the bonnet weight and move the retaining lock body 5. Since it is greater than the return biasing force of the spring 31, even if the hand is released from the operation tool 32, the retaining locking body 5 is maintained in the retaining prevention releasing posture.

When the bonnet 21 is lifted upward in the state shown in FIG. 8B, the retaining locking body 5 is rotated to the retaining action posture side by the return urging force of the urging spring 31, and the state shown in FIG. 8C. Return to.
When the locked body 30 is lowered from the state shown in FIG. 8C, the locked body 30 comes into contact with the inclined surface 52 of the retaining latch 5 and is biased by the weight of the bonnet 21. The retaining member 5 is rotated about the pivot shaft 50 against the urging force of the spring 31, and the member 30 enters the engaging recess 40 of the fixing bracket 4 as shown in FIG. It becomes the retaining action posture shown.

[Other Embodiment 1]
The bonnet locking device 3 is not limited to the structure shown in the above embodiment, and may be configured as shown in FIG. 9, for example.
In this structure, the fixing bracket 4 is the same as that of the structure shown in the above embodiment, but the retaining member 5 is slidably attached to the fixing bracket 4 in the left-right direction. The urging spring 31 is urged so as to operate the retaining locking body 5 toward the retaining posture.

The sliding movement structure of the retaining latch 5 includes a pair of guide pins 43 and 43 provided in the fixing bracket 4 in a pair of long holes 57 and 57 formed in the retaining latch 5. It is configured to be slidable.
As shown in FIG. 9A, the length of each of the long holes 57, 57 in the sliding direction is such that the retaining member 5 is pulled by the biasing spring 31 in one direction. In the state of being positioned, the guide pins 43 and 43 come into contact with one end of the long holes 57 and 57, and as shown in FIG. In a state where the operating tool 32 is pulled and positioned in the retaining release releasing posture, the guide pins 43 and 43 are set to have a length so as to come into contact with the other ends of the long holes 57 and 57. In the state shown in FIG. 9B, the return biasing force toward the return side of the biasing spring 31, that is, the retaining action posture side is acting on the retaining locking body 5. The body 30 is positioned at the release position holding portion 54, and its bonnet weight is acting. In order for the locked body 30 to exceed the movement restricting portion 54a in this state, it is necessary to apply a force that can overcome the movement resistance due to the bonnet weight and move the retaining lock body 5. Since the return biasing force of the spring 31 is greater, the retaining locking body 5 is maintained in the retaining release releasing posture even when the hand is released from the operation tool 32, as in the above-described embodiment. It is.
Further, when the bonnet 21 is lifted upward in the state shown in FIG. 9B, the retaining locking body 5 is rotated toward the retaining action posture side by the return biasing force of the biasing spring 31, and FIG. It is the same as that of the above-mentioned embodiment also in the point which returns to the state shown in.

  In this embodiment, the fixing latch 4 is attached in a state where the rear surface side of the retaining locking body 5 is in sliding contact with the front surface side of the fixing bracket 4 and is provided on one end side in the left-right direction of the retaining locking body 5. The end portion of the urging spring 31 is locked to the bent portion 5a to the side, and the operation tool 32 for artificial operation is provided to the bent portion 5b to the front side provided on the other end side of the retaining lock body 5. It is locked.

[Second embodiment]
Further, the bonnet locking device 3 is not limited to the structure shown in the above embodiment, and may be configured as shown in FIGS. 10 and 11, for example.
In this structure, the fixing bracket 4 and the retaining latch 5 are provided, and the guide rail 6 for guiding the retaining latch 5 so as to be slidable in the left-right direction with respect to the fixing bracket 4 is provided. I have.
As shown in FIGS. 10 and 11 (a), the guide rail 6 includes a horizontally elongated rail portion 60 having a concave groove shape and a rising piece portion 61 erected upward at the center portion thereof. A pedestal portion 5A on the lower end side of the retaining latch 5 is fitted in the groove 60A of the horizontally long rail portion 60, and is configured to be slidable in the longitudinal direction of the groove.
A guide pin 62 is fixed to the rising piece 61, and the guide pin 62 is inserted into a horizontally long slot 57 formed in the retaining latch 5 to prevent the retaining latch 5 from sliding. An allowable range is configured to be defined by contact between the guide pin 62 and both ends of the long hole 57.

With this structure, the bonnet 21 can be opened and closed by the same action as that of the structure described in [1 of another embodiment] shown in FIGS. 9A to 9C.
That is, in the state shown in FIG. 10, the locked body 30 on the bonnet 21 side enters the engaging recess 40 of the fixing bracket 4 and the retaining member on the upper side is the same as in the case shown in FIG. The retaining protrusion 51 of the stationary body 5 is located, and this state is maintained by the pulling action of the biasing spring 31.
From this state, when the manipulating operation tool 32 is pulled against the urging force of the urging spring 31, the retaining engagement body 5 is released from the retaining release posture as shown in FIG. 9B. The locked body 30 on the bonnet 21 side is positioned in the release position holding portion 54.
Then, when the bonnet 21 is lifted upward from this state, the retaining locking body 5 is returned to the retaining action posture side by the restoring biasing force of the biasing spring 31 as in the case shown in FIG. .

FIG. 11B is the same as the structure shown in FIGS. 10 and 11A except that the shape of the horizontally long rail portion 60 of the guide rail 6 is different.
In this structure, the shape of the horizontally long rail portion 60 is formed in a shape including a lifting prevention piece 64 on the opening side of the groove 60A. Thereby, the base portion 5A on the lower end side of the retaining member 5 can be prevented from rising upward.
In addition, the code | symbol 63 in Fig.11 (a) and FIG.11 (b) is a backing metal for pinching | interposing the said securing part 5 in the state which can be relatively moved between the said standup piece parts 61. FIG. .

[3 of another embodiment]
In each of the above embodiments, the bottom portion 54b (corresponding to the contact position) of the release position holding portion 54 is the same height as the bottom portion 40a (corresponding to the contact position) of the engagement recess 40 in the retaining release posture of the retaining member 5. However, the present invention is not limited to this, and the bottom portion 54b of the release position holding portion 54 is formed to be slightly higher than the bottom portion 40a of the engagement recess 40 in the retaining release posture of the retaining member 5. For example, the bonnet 21 may be configured such that the weight of the bonnet 21 acts positively on the retaining member 5 side.

[4 of another embodiment]
In each of the above-described embodiments, the locked body 30 is provided on the bonnet 21 side, and the fixing bracket 4 can be locked to the lower cover 10A on the traveling vehicle body 1 side. In addition, although the structure including the urging spring 31 that constantly urges the retaining member 5 toward the retaining posture is shown, the present invention is not limited to this.
That is, the lower cover 10 </ b> A on the traveling vehicle body 1 side or the other traveling vehicle body 1 side includes the locked body 30, and the fixing bracket 4 on the bonnet 21 side and the retaining member that can lock the locked body 30. The structure provided with the stop body 5 and the urging | biasing spring 31 which always urges | biases the retaining latching body 5 to the retaining action attitude | position side may be sufficient.

  The present invention can be used as a bonnet lock device for various working machines such as a combiner, a mower, a rice transplanter, or a construction machine in addition to the tractor shown in the embodiment.

DESCRIPTION OF SYMBOLS 3 Bonnet locking device 4 Fixing bracket 5 Locking locking body 21 Bonnet 30 Locked body 31 Energizing spring 40 Engaging recess 51 Locking protrusion 54 Release position holding part x1 Oscillation fulcrum (horizontal shaft core)

Claims (2)

A bonnet locking device for a work vehicle, wherein a bonnet configured to be swingable up and down around a swinging fulcrum on a vehicle body side is configured to be detachable with respect to a body part opposite to the swinging fulcrum. ,
A locked body is provided on one side of the bonnet side or the vehicle body side, a fixing bracket on the other side, a retaining latch body that can latch the latched body, and the retaining latch body are removed. An urging spring for urging the stopper acting posture side,
The fixing bracket can be engaged / disengaged from the one side in the up / down direction with the locked body provided on the one side, and in a horizontal direction intersecting with the locking / disengaging direction of the locked body in the engaged state. An engagement recess that restricts movement is formed,
The retaining locking body includes a retaining protrusion that restricts the locking body engaged in the engaging recess of the fixing bracket in a retaining posture and restricts the retaining member in the vertical direction. It is configured so that the posture can be freely switched to a retaining release posture that allows the locked body to be removed by retreating from the vertical position of the engaging recess.
Further, the retaining locking body includes a release position holding portion that engages with the locked body when the posture is switched to the retaining release releasing posture. Due to the weight of the bonnet side loaded at the contact location between the body and the release position holding portion, the retaining spring body moves toward the retaining action posture side against the biasing force toward the retaining action posture side of the biasing spring. A hood lock device for a work vehicle, characterized in that it is configured to prevent the return of the vehicle.   2. The hood lock device for a work vehicle according to claim 1, wherein the contact position of the engagement recess with respect to the object to be locked and the contact position with respect to the release position holding part in the retaining release posture of the retaining member are at the same height.

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