Work vehicle

Abstract

To provide a work vehicle which can easily and surely lock without troubling an operator when locking a radiator in a laterally opened state, and which eliminates management of components unnecessary for radiator locking.SOLUTION: A hinge mechanism 40A for allowing a radiator 30 to be opened laterally includes: a fixed flat plate 410 fixed to a body frame 13; a movable flat plate 420 fixed to the radiator 30; a pivotally support pin 430 for pivotally supporting the fixed flat plate 411 and the movable flat plate 421; and a radiator lock mechanism 500 for locking the radiator in a laterally opened state. The radiator lock mechanism 500 includes: a lock pin 510 in which a lower end part moves on an upper surface 411a of the fixed flat plate 411 according to the rotation of the movable flat plate 421; and a lock pin falling hole 520 provided at the fixed flat plate 411, and for falling the lock pin 510 when the radiator 30 comes into a laterally opened state.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a work vehicle equipped with a radiator. [Background technology]

[0002] Well-known examples of work vehicles include crawler-type skid steer loaders and hydraulic shovels (also called power shovels, excavators, backhoes, etc.) that are used for excavating the ground and moving excavated soil and sand. Such work vehicles are configured such that various attachments, such as a bucket, chip breaker (also called simply a "breaker"), and auger device, can be detachably attached to the tip of an arm that is mounted on the front of the vehicle so as to be able to swing up and down, and predetermined work can be performed by detaching and replacing the attachments depending on the work purpose.

[0003] Also, as a work vehicle of this type, there is known one in which a cabin for an operator is provided on top of the vehicle and an engine is mounted behind the cabin, and a fan shroud and a radiator are provided behind the engine.

[0004] Here, the radiator is supported by a hinge on the main body frame of the work vehicle so as to be able to open and close freely, and is normally fixed by bolts etc. so as to cover the rear side of the engine. When performing maintenance work, the bolts can be removed and the radiator can be rotated a predetermined angle around the hinge as a fulcrum (see, for example, Patent Document 1).

[0005] In the work vehicle described in Patent Document 1, the radiator is supported by multiple hinges provided in the vertical direction of the main frame of the work vehicle, and is normally fixed with bolts while covering the rear side of the engine. When performing maintenance work, the bolts fixing the radiator are removed and the hinge mechanism rotates the radiator to a predetermined angle to open to the side at the predetermined angle.

[0006] Thus, in the work vehicle described in Patent Document 1, the radiator is a so-called side-opening radiator, and when performing maintenance work, the radiator is opened sideways at a predetermined angle to perform the maintenance. A fan shroud is present between the radiator and the engine, and the fan shroud impedes access to parts requiring maintenance. However, in Patent Document 1, an opening for maintenance is provided in the fan shroud, improving access to the parts to be maintained and making the maintenance work more efficient. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2017-39363 A Summary of the Invention [Problem to be solved by the invention]

[0008] As described above, the work vehicle described in Patent Document 1 is a work vehicle that can improve the efficiency of maintenance work, but further improvements are required. For example, when the radiator is opened to the side at a predetermined angle, it is important in terms of the efficiency of maintenance work and also in terms of safety to reliably lock the radiator in the opened state.

[0009] That is, the radiator, which is in a sideways open state, may move back to the closed position during work. In the case of this type of work vehicle, the radiator generally weighs several tens of kilograms, so if the radiator moves in the closed position during inspection work, it not only interferes with the work, but also poses a safety problem.

[0010] Incidentally, in order to lock a radiator in a side-open state, a radiator lock pin (called a radiator lock member) provided on a work vehicle is also used to lock the radiator. Specifically, the radiator lock part is normally removably stored in the frame of the radiator and fixed with an R pin or the like inserted to prevent it from falling out. To lock the radiator, the R pin is removed and the radiator lock member is taken out, and then the lock hole on the movable side (radiator side) is aligned with the lock hole on the fixed side (for example, the main body frame side), and the radiator lock member is inserted into each of the aligned lock holes to lock the radiator.

[0011] The provision of such a radiator locking member makes it possible to lock the radiator in a sideways-open state; however, to lock the radiator, as described above, it is necessary to remove the R-pin and take out the radiator locking member, and then align the locking hole on the movable side with the locking hole on the fixed side and insert the radiator locking member.

[0012] This causes a problem that there are many steps to lock the radiator, which is time-consuming. In particular, it is necessary to align the respective locking holes to match each other, and even after alignment, it is necessary to insert the radiator locking member while holding the radiator in a side-open state with one's hand so that the respective locking holes do not become misaligned. In addition, the worker must manage the removed R pins and the like so as not to lose them. Therefore, when locking a radiator in a side-open state, there is a demand for a system that can easily and reliably lock the radiator without bothering the worker, and that also does not require the management of the radiator locking member.

[0013] The present invention has been made in consideration of such problems, and has an object to provide a work vehicle that can easily and reliably lock a radiator in a sideways-open state without troubling the worker, and that also eliminates the need to manage the radiator locking member. [Means for solving the problem]

[0014] [1] The work vehicle of the present invention is a work vehicle equipped with a radiator, the radiator is rotatable in the left and right direction by a plurality of hinge mechanisms provided along the up and down direction of a main body frame of the work vehicle, and can be opened to the side at a predetermined angle, at least one of the plurality of hinge mechanisms comprises a fixed flat plate fixed to the main body frame and provided with one surface being an upper surface facing upward and the other surface being a lower surface facing downward, a movable flat plate fixed to the radiator and provided with one surface being an upper surface facing upward and the other surface being a lower surface facing downward, and a movable flat plate which is movable forward relative to the fixed flat plate with the lower surface of the movable flat plate facing the upper surface of the fixed flat plate. The radiator locking mechanism includes: an axle support pin that supports the fixed flat plate and the movable flat plate by an axle portion so that the movable flat plate can rotate; and a radiator locking mechanism that locks the rotation of the radiator when the radiator is in the side-open state at the predetermined angle, wherein the radiator locking mechanism includes a lock pin that penetrates the movable flat plate so as to be able to move vertically and is supported by the movable flat plate so that its lower end can contact the upper surface of the fixed flat plate under its own weight, and the lower end moves in an arc on the upper surface of the fixed flat plate as the movable flat plate rotates; and a lock pin drop hole that is provided in the fixed flat plate and drops the lock pin when the radiator is in the side-open state at the predetermined angle.

[0015] [2] In the work vehicle of the present invention, the axle support pin has an axle support pin protrusion, the axle portion of which protrudes upward above the upper surface of the movable flat plate, a head portion having a larger diameter than the axle portion is provided on the upper end side of the axle support pin protrusion, and a flange portion is provided on the movable flat plate side of the axle support pin protrusion for restricting downward movement of the axle support pin, the lock pin has a lock pin protrusion that protrudes upward from the upper surface of the movable flat plate, and a connecting plate is fixed to the lock pin protrusion, extending toward the axle support pin protrusion and connected to the axle portion of the axle support pin protrusion, and it is preferable that the connecting plate moves up and down along the axle portion between the head and the flange portion of the axle support pin protrusion in conjunction with the up and down movement of the lock pin.

[0016] [3] In the work vehicle of the present invention, it is preferable that the connecting plate has a forked portion formed at the tip side in the extension direction extending toward the axle support pin protrusion, and that the forked portion is connected to the axle portion of the axle support pin protrusion.

[0017] [4] In the work vehicle of the present invention, it is preferable that the radiator lock mechanism is provided in an uppermost hinge mechanism among the plurality of hinge mechanisms. Effect of the Invention

[0018] In the work vehicle of the present invention, the hinge mechanism for opening and closing the radiator has a lock pin supported on the movable flat plate so as to be movable up and down, and a lock pin drop hole provided in the fixed flat plate. When the radiator is opened (opened to the side), the movable flat plate rotates, and the lower end of the lock pin moves in an arc on the upper surface of the fixed flat plate in accordance with the rotation of the movable flat plate, and when the radiator is opened to the side at a predetermined angle, the lock pin drops into the lock pin drop hole provided in the fixed flat plate. As a result, the radiator is locked in the opened to the side at the predetermined angle.

[0019] In this way, according to the present invention, the radiator is automatically locked when the radiator is opened to the side at a predetermined angle, so the radiator can be locked easily and reliably without bothering the worker. Moreover, when locking the radiator, the worker does not need to remove the member required for locking the radiator (the radiator lock member), so there is also no need to manage the radiator lock member.

[0020] The pivot pin has a head portion that is larger in diameter than the shaft portion of the pivot pin at the upper end side of the pivot pin protruding portion that protrudes upward from the upper surface of the movable flat plate, and a flange portion that restricts the downward movement of the pivot pin is provided on the movable flat plate side of the pivot pin protruding portion. Meanwhile, the lock pin has a lock pin protruding portion that protrudes upward from the upper surface of the movable flat plate, and a connecting plate that extends toward the pivot pin protruding portion and is connected to the shaft portion of the pivot pin protruding portion is fixed to the lock pin protruding portion. This connecting plate moves up and down along the shaft portion between the head portion and flange portion of the pivot pin protruding portion in accordance with the up and down movement of the lock pin.

[0021] With the pivot pin and lock pin configured as described above, the amount of upward movement of the lock pin is restricted by the connection plate abutting against the head of the pivot pin. Therefore, even if the work vehicle swings significantly due to vigorous work such as digging the ground or moving excavated soil at a work site, the lock pin is reliably prevented from slipping out of the movable flat plate. In addition, the amount of downward movement (fall) of the lock pin is restricted by the connection plate abutting against the flange of the pivot pin, so that the lock pin is reliably prevented from falling more than necessary.

[0022] Furthermore, because the protrusion of the lock pin and the pivot pin protrusion are connected by a connecting plate, the lock pin can always be held in an appropriate upright position (perpendicular or nearly perpendicular to the upper surface of the fixed flat plate.) As a result, when the radiator is opened to the side at a predetermined angle, the lock pin drops while maintaining the upright position, so that it can be dropped reliably into the lock pin drop hole.

[0023] In addition, the connecting plate has a forked portion formed at the tip side in the extension direction toward the pivot pin protrusion, so that the connecting plate can be connected to the shaft portion between the head portion, which has a larger diameter than the shaft portion, and the flange portion.

[0024] Furthermore, by providing the radiator lock mechanism on the uppermost hinge mechanism among the multiple hinge mechanisms, the position (height from the road surface) of the hinge mechanism on which the radiator lock mechanism is provided is at a height that is easy for an operator to operate in a typical work vehicle. This makes it easier to perform the unlocking operation when unlocking a locked radiator. Note that the unlocking operation in the work vehicle of the present invention is a simple operation of simply lifting up the lock pin that has fallen into the lock pin drop hole, but by providing the hinge mechanism on which the radiator lock mechanism is provided at a height that is easy for an operator to operate, this unlocking operation becomes easier and the efficiency of the work is improved. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a perspective view of a work vehicle 1 according to an embodiment, as viewed from the rear side. [Diagram 2] 2 is a view of the working vehicle 1 shown in FIG. 1 with the engine cover 18 and the rear door 19 in an open state. [Diagram 3] 3 is an enlarged perspective view of a first hinge mechanism 40A shown in FIG. 2. FIG. [Figure 4] 4A and 4B are a plan view and a side view of the first hinge mechanism 40A shown in FIG. [Diagram 5]11A and 11B are a plan view and a side view of a first hinge mechanism 40A when the radiator 30 is in a sideways-open state at a predetermined angle. [Figure 6] 11 is a perspective view of a first hinge mechanism 40A when a radiator 30 is in a sideways-open state at a predetermined angle. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A work vehicle 1 according to the embodiment will be described by taking as an example a crawler skid steer loader (hereinafter referred to as a crawler loader) with a bucket attached to the end of an arm. First, the external configuration of the work vehicle 1 according to the embodiment will be described with reference to Figs. 1 and 2. Note that the external configuration of the work vehicle 1 according to the embodiment is not the gist of the present invention, so only a general description will be given. Note that in the following description, the work vehicle 1 according to the embodiment may be abbreviated simply to "work vehicle 1".

[0027] In addition, in the following description, when discussing up, down, left, and right, the bottom side of the work vehicle 1 will be referred to as bottom and the side opposite the bottom as top, and the left side of the work vehicle 1 when viewed from the rear will be referred to as left, and the right side will be referred to as right.

[0028] Fig. 1 is a perspective view of a work vehicle 1 according to embodiment 1 as viewed from the rear side. Of the front, rear, left side, right side and top of the work vehicle 1, only the rear, right side and top can be seen in Fig. 1.

[0029] As shown in FIG. 1, the work vehicle 1 has a pair of left and right traveling devices 12 each having an endless track (crawler) 11, a main body frame 13 to which the traveling devices 12 are attached on the left and right sides, a work device 14 attached to the main body frame 13, and a cabin 15 provided in the upper center of the main body frame 13.

[0030] The cabin 15 is formed in a box shape, and a freely openable front door (not shown) is provided on the front side of the work vehicle 1. An operator's seat (not shown) on which an operator sits facing the front of the vehicle is provided inside the cabin 15, and remote control levers (operation levers) (not shown) for operating the traveling device 12 and the work device 14 are disposed on the left and right sides of the operator's seat.

[0031] The working device 14 has, as some of its components, an arm 16 arranged to surround the front, rear, left and right of the cabin 15, a pair of left and right hydraulic cylinders (arm cylinders) 17 attached across the main frame 13 and the arm 16, and a bucket (not shown) attached to the front end of the arm 16 via a bracket (not shown).

[0032] The work vehicle 1 can be operated by an operator sitting in the operator's seat and operating a remote control lever (operating lever) (not shown), which in turn drives the traveling device 12 to travel the work vehicle 1, swings the arm 16 up and down, and swings the bucket (not shown) up and down, in accordance with the operation of the remote control lever (operating lever) (not shown).

[0033] The work vehicle 1 also has an engine EG (see FIG. 2) provided behind the cabin 15. The left and right sides of the engine EG are covered by the main body frame 13, and the top and rear are covered by an engine cover 18 and a rear door 19, respectively.

[0034] The engine cover 18 is provided by a hinge mechanism (not shown) so as to be able to be opened and closed in the vertical direction relative to the main body frame 13, and is normally held in a closed state relative to the main body frame 13 by a cover lock mechanism (not shown). On the other hand, the rear door 19 is provided so as to be able to be opened and closed in the horizontal direction about a pair of upper and lower hinge mechanisms 20A, 20B (see FIG. 2) provided along the vertical direction at the left end when the work vehicle 1 is viewed from the rear, and is normally held in a closed state relative to the main body frame 13 by a door lock mechanism (not shown).

[0035] Fig. 2 is a view of the work vehicle 1 shown in Fig. 1 with the engine cover 18 and rear door 19 in an open state. In Fig. 2, the same components as those shown in Fig. 1 are given the same reference numerals. When the cover lock mechanism (not shown) is unlocked and the engine cover 18 is in an open state, the engine EG is present. When the door lock mechanism (not shown) is unlocked and the rear door 19 is in an open state, the radiator 30 is provided, and a fan shroud (not shown) and a radiator fan (not shown) are provided between the radiator 30 and the engine EG.

[0036] The radiator 30 is supported so as to be openable and closable in the left-right direction (the direction of the arrows a-a') by hinge mechanisms 40A, 40B provided at a plurality of locations (two locations) along the up-down direction on the left side of the main body frame 13 when the work vehicle 1 is viewed from the rear side. The right end of the radiator 30 when the work vehicle 1 is viewed from the rear side is fixed to the main body frame 13 by nuts 60A, 60B. Specifically, the radiator 30 is fixed in the closed state by aligning the bolt through-holes on the radiator 30 side with bolts (not shown) protruding from the main body frame 13 side, and screwing and tightening the nuts 60A, 60B onto the bolts protruding from the bolt through-holes.

[0037] When performing maintenance work or the like, the radiator 30 can be opened to a sideways-open state at a predetermined angle by removing the nuts 60A, 60B. In the work vehicle 1 according to the embodiment, the predetermined angle is 75 degrees, and the radiator can be opened to a sideways-open state of 75 degrees. In the following description, the "sideways-open state at a predetermined angle" may be abbreviated to simply "sideways-open state."

[0038] Of the hinge mechanisms 40A, 40B provided on the left side of the main body frame 13 along the vertical direction, the upper hinge mechanism 40A will be referred to as the first hinge mechanism 40A, and the lower hinge mechanism 40B will be referred to as the second hinge mechanism 40B. At least one of the first hinge mechanism 40A and the second hinge mechanism 40B includes a radiator lock mechanism 500 that locks the radiator 30 in a sideways-open state when the radiator 30 is opened sideways.

[0039] In the work vehicle 1 according to the embodiment, the radiator lock mechanism 500 is provided in the first hinge mechanism 40A. The radiator lock mechanism 500 will be described in detail below. Before describing the radiator lock mechanism 500, the basic configuration of the first hinge mechanism 40A as a hinge mechanism will first be described. Note that the basic configuration as a hinge mechanism is substantially the same for the first hinge mechanism 40A and the second hinge mechanism 40B.

[0040] FIG. 3 is an enlarged perspective view of the first hinge mechanism 40A shown in FIG. 2. FIG. 4 is a plan view and a side view of the first hinge mechanism 40A shown in FIG. 3. In FIG. 4, FIG. 4(a) is a plan view of the first hinge mechanism 40A shown in FIG. 3 seen from above along the z-axis, and FIG. 4(b) is a side view of FIG. 4(a) seen along the y-axis. In FIG. 3 and FIG. 4, the radiator 30 is shown in a closed state. In FIG. 3 and FIG. 4, the same components as those shown in FIG. 1 and FIG. 2 are denoted by the same reference numerals. In FIG. 4, the main body frame 13 and the radiator 30 are shown in a schematic manner.

[0041] The first hinge mechanism 40A will be described with reference to Figures 3 and 4. The first hinge mechanism 40A includes a fixed flat plate 411 fixed to the main body frame 13, a movable flat plate 421 fixed to the radiator 30, a pivot pin 430 that pivotally supports the fixed flat plate 411 and the movable flat plate 421 by a pivot portion 434 so that the movable flat plate 421 can rotate relative to the fixed flat plate 411, and a radiator lock mechanism 500 that locks the rotation of the radiator 30 when the radiator 30 is rotated to a predetermined angle.

[0042] Specifically, the fixed flat plate 411 is provided so that one surface is an upper surface 411a facing upward along the z-axis, and the other surface is a lower surface 411b facing downward (see FIG. 4(b)). The movable flat plate 421 is provided so that one surface is an upper surface 421a facing upward, and the other surface is a lower surface 421b facing downward (see FIG. 4(b)). The pivot pin 430 pivotally supports the fixed flat plate 411 and the movable flat plate 421 by a pivot portion 434 so that the movable flat plate 421 can rotate with respect to the fixed flat plate 411 with the lower surface 421b of the movable flat plate 421 facing the upper surface 411a of the fixed flat plate 411.

[0043] 4(b), the pivot pin 430 has a protruding portion 431 (referred to as the pivot pin protruding portion 431) in which the shaft portion 434 of the pivot pin 430 protrudes upward from the upper surface 421a of the movable flat plate 421. A head portion 432 having a larger diameter than the shaft portion 434 of the pivot pin 430 is provided on the upper end side of the pivot pin protruding portion 431, and a flange portion 433 for restricting the downward movement of the pivot pin 430 is provided on the movable flat plate 421 side of the pivot pin protruding portion 431. The head portion 432 and the flange portion 433 do not necessarily need to have a circular shape in a plan view, and may have a polygonal shape (e.g., a hexagon, etc.) in a plan view, for example.

[0044] In addition, a fixed flat plate 412 having substantially the same external shape as the fixed flat plate 411 is provided below the fixed flat plate 411 at a predetermined distance (see FIG. 4(b)). A cylindrical bearing portion 413 (see FIG. 4(b)) through which the shaft portion 434 (see FIG. 4(b)) of the pivot pin 430 passes is provided between the fixed flat plates 411 and 412. The fixed flat plate 412 located below the fixed flat plate 411 is referred to as the "auxiliary fixed flat plate 412" here. The fixed flat plate 411, the auxiliary fixed flat plate 412, and the bearing portion 413 form the fixed side hinge bracket 410.

[0045] On the other hand, a movable flat plate 422 having substantially the same external shape as the movable flat plate 421 is provided at a predetermined distance below the movable flat plate 421. The lower movable flat plate 422 is referred to as the "auxiliary movable flat plate 422" here. The movable flat plate 421 and the auxiliary movable flat plate 422 form a movable-side hinge bracket 420.

[0046] The fixed flat plate 411 and the auxiliary fixed flat plate 412 are sandwiched vertically by the movable flat plate 421 and the auxiliary movable flat plate 422, and are supported by a shaft portion 434 of the pivot pin 430. That is, the shaft portion 434 of the pivot pin 430 passes through pivot pin through holes (not shown) provided in the movable flat plate 421, the fixed flat plate 411, the bearing portion 413, the auxiliary fixed flat plate 412, and the auxiliary movable flat plate 422 from above, and a lower end portion 434a of the pivot pin 430 protrudes below the auxiliary movable flat plate 422.

[0047] An R pin 440 for preventing the shaft portion 434 from coming off is inserted into the lower end portion 434a of the shaft portion 434 protruding downward from the auxiliary fixed flat plate 412. This prevents the shaft support pin 430 from coming off in the upward direction.

[0048] Moreover, an annular boss 414 (see FIG. 4(b)) is formed on the upper surface 411a of the fixed flat plate 411 so as to surround the periphery of a pivot pin through hole (not shown) of the fixed flat plate 411. Similarly, an annular boss 415 is formed on the lower surface 412b of the auxiliary fixed flat plate 412 so as to surround the periphery of a pivot pin through hole (not shown) of the auxiliary fixed flat plate 412.

[0049] As a result, a boss 414 is interposed between the upper surface 411a of the fixed flat plate 411 and the lower surface 421b of the movable flat plate 421, and a boss 415 is interposed between the lower surface 412b of the auxiliary fixed flat plate 412 and the upper surface 422a of the auxiliary movable flat plate 422. The presence of such bosses 414, 415 can reduce friction when the movable flat plate 421 rotates relative to the fixed flat plate 411, and can also reduce friction when the auxiliary movable flat plate 422 rotates relative to the auxiliary fixed flat plate 412. This allows the radiator 30 to be opened and closed smoothly.

[0050] The basic configuration of the hinge mechanism in the hinge mechanism 40A as described above is the same in the second hinge mechanism 40B, so the description of the second hinge mechanism 40B will be omitted. However, the above-mentioned portion of the pivot pin protrusion 431 excluding the flange portion 433 is not particularly necessary in the second hinge mechanism 40B. For this reason, the second hinge mechanism 40B is provided with a retaining portion for preventing the pivot pin 430 from slipping out downward. As the retaining portion, for example, the shaft portion 434 of the pivot pin 430 may be slightly protruded from the upper surface 421a of the movable flat plate 421, and an R pin may be inserted into the slightly protruding shaft portion, or a head portion having a larger diameter than the shaft portion 434 may be provided at the end (upper end) of the slightly protruding shaft portion. If the flange portion 433 is left, the flange portion 433 serves as a head portion.

[0051] Incidentally, first hinge mechanism 40A is provided with a radiator lock mechanism 500 that locks radiator 30 in the side-open state when radiator 30 is in the side-open state, in addition to the basic configuration of a hinge mechanism. The radiator lock mechanism 500 will be described below.

[0052] The radiator lock mechanism 500 is provided on the fixed flat plate 411 and the movable flat plate 421 of the first hinge mechanism 40A. The radiator lock mechanism 500 has a lock pin 510 supported by the movable flat plate 421, and a lock pin drop hole 520 provided on the fixed flat plate 411 for dropping the lock pin 510 when the radiator 30 rotates to a predetermined angle and enters a sideways open state.

[0053] The lock pin 510 passes through a lock pin through hole 416 (see Figures 3 and 4(b)) provided in the movable flat plate 421 so as to be able to move freely up and down, and is supported by the movable flat plate 421 so that its lower end portion 511 (see Figure 4(b)) can contact the upper surface 411a of the fixed flat plate 411 under its own weight.

[0054] 4(b), the lock pin 510 is supported by the movable flat plate 421 so as to have a protrusion 512 (referred to as a lock pin protrusion 512) that protrudes upward from the upper surface 421a of the movable flat plate 421. A connecting plate 530 that extends toward the pivot pin protrusion 431 and is connected to the shaft 434 of the pivot pin protrusion 431 is fixed to the lock pin protrusion 512 by welding or the like.

[0055] Incidentally, the lock pin through hole 416 formed in the movable flat plate 421 is formed on the tip side of the movable flat plate 421 with respect to the central axis Oz2 (see FIGS. 4(a) and 4(b)) of the pivot pin 430 which is the rotation center of the movable flat plate 421. As a result, when the movable flat plate 421 rotates around the pivot pin 430 as the rotation axis, the lock pin 510 moves so as to describe an arc with the radius of the line segment connecting the central axis Oz2 of the pivot pin 430 and the central axis Oz1 of the lock pin 510. In this case, since the rotation angle of the movable flat plate 421 is set to 75 degrees, the lock pin 510 moves so as to describe an arc (dashed arrow C shown in FIG. 4(a)) corresponding to the rotation angle (75 degrees).

[0056] On the other hand, as described above, the fixed flat plate 411 is formed with a lock pin drop hole 520 for dropping the lock pin 510. This lock pin drop hole 520 is a hole for dropping the lock pin 510 when the radiator 30 rotates to a predetermined angle (75 degrees) and enters a sideways-open state. Specifically, the lock pin drop hole 520 is formed in the fixed flat plate 411 at a movement position (reach position of the lock pin 510) of the lock pin 510 when the radiator 30 rotates to a predetermined angle (75 degrees) and enters a sideways-open state.

[0057] Here, the lock pin 510, the connecting plate 530 fixed to the lock pin protrusion 512, and the pivot pin 430 will be further described. As described above, the lock pin 510 has the lock pin protrusion 512 protruding upward from the upper surface 421a of the movable flat plate 421 (see FIG. 4(b)). On the other hand, as described above, the pivot pin 430 also has the pivot pin protrusion 431 (see FIG. 4(b)) in which the shaft portion 434 of the pivot pin 430 protrudes upward from the upper surface 421a of the movable flat plate 421.

[0058] As described above, a connecting plate 530 is fixed to the lock pin protrusion 512. This connecting plate 530 is connected to the shaft portion 434 between the head portion 432 and the flange portion 433 provided on the pivot pin protrusion 431. The connecting plate 530 is movable up and down on the shaft portion 434 between the head portion 432 and the flange portion 433 of the pivot pin protrusion 431. In the following description, the "shaft portion 434 between the head portion 432 and the flange portion 433" may be abbreviated to "shaft portion 434 of the pivot pin protrusion 431."

[0059] The connecting plate 530 has a bifurcated portion 531 (see Figs. 3 and 4(a)) formed on the tip side in the extension direction, and the bifurcated portion 531 is connected to the shaft portion 434 of the pivot pin protrusion 431 by sandwiching the shaft portion 434 of the pivot pin protrusion 431. Note that the connecting plate 530 is connected so as to be able to move up and down along the shaft portion 434 of the pivot pin protrusion 431, but it goes without saying that the connecting plate 530 is also able to rotate around the axis relative to the shaft portion 434.

[0060] Incidentally, head 432 provided on pivot pin protrusion 431 serves as an upward movement amount restricting portion that restricts the amount of upward movement of lock pin 510. In other words, when lock pin 510 moves upward, connecting plate 530 fixed to lock pin 510 also moves upward and comes into contact with head 432, restricting the amount of upward movement of lock pin 510.

[0061] On the other hand, the flange 433 provided on the pivot pin protruding portion 431 has the role of restricting the downward movement of the pivot pin 430 and maintaining the protruding amount of the pivot pin protruding portion 431. That is, since the flange 433 provided on the pivot pin protruding portion 431 is in contact with the movable flat plate 421, the downward movement of the pivot pin 430 is restricted by the flange 433. This maintains the protruding amount of the pivot pin protruding portion 431.

[0062] Furthermore, the flange 433 provided on the pivot pin protruding portion 431 not only serves to maintain the amount of protrusion of the pivot pin protruding portion 431, but also serves as a lock pin drop amount restriction portion that restricts the amount of drop of the lock pin 510. That is, when the lock pin 510 drops into the lock pin drop hole 520, the connecting plate 530 fixed to the lock pin 510 moves down along the shaft 434 of the pivot pin protruding portion 431 and comes into contact with the flange 433. This restricts the amount of drop of the lock pin 510.

[0063] In this way, the pivot pin protrusion 431 has a head 432, a flange 433, and a shaft 434 between the head 432 and the flange 433, and the connecting plate 530 is movable up and down along the shaft 434 between the head 432 and the flange 433 in the pivot pin protrusion 431. Specifically, the connecting plate 530 is located directly below the head 432 of the pivot pin protrusion 431 when the lower end 511 of the lock pin 510 is in contact with the upper surface 411a of the fixed flat plate 411. On the other hand, when the lock pin 510 drops into the lock pin drop hole 520 of the fixed flat plate 411, the connecting plate 530 comes into contact with the flange 433 of the pivot pin protrusion 431. By appropriately setting the distance d between the head 432 and the flange 433 of the pivot pin protrusion 431, the amount of drop of the lock pin 510 can be set.

[0064] Moreover, it is desirable that the lock pin 510 is supported by the movable flat plate 421 so as to be in an upright position. That is, it is desirable that the lock pin 510 is supported by the movable flat plate 421 so that the central axis Oz1 (see FIG. 4(a) and FIG. 4(b)) of the lock pin 510 is perpendicular or nearly perpendicular to the upper surface 411a of the fixed flat plate 411 and the upper surface 421a of the movable flat plate 421, but since the lock pin 510 is connected to the pivot pin 430 by the connecting plate 530, the lock pin 510 can always be held in an appropriate upright position (perpendicular or nearly perpendicular to the upper surface 421a of the movable flat plate 421 and the upper surface 411a of the fixed flat plate 411).

[0065] Next, the operation of the radiator lock mechanism 500 will be described with reference to Figs. 3, 4, 5, and 6. Figs. 3 and 4 are diagrams used in describing the hinge mechanism 40A and the radiator lock mechanism 500, and the radiator 30 is in a closed state. Fig. 5 is a plan view and a side view of the first hinge mechanism 40A when the radiator 30 is in a side-open state. In Fig. 5, Fig. 5(a) is a plan view seen from above along the z-axis, and Fig. 5(b) is a cross-sectional view taken along the line AA in Fig. 5(a), but the pivot pin 430 and the lock pin 510 are not shown as cross sections in Fig. 5(b). Fig. 6 is a perspective view of the first hinge mechanism 40A when the radiator 30 is in a side-open state.

[0066] 5 and 6, the same components as those shown in Figures 1 to 4 are denoted by the same reference numerals. Also, in Figures 5 and 6, some of the reference numerals for components that are not particularly necessary for explaining the operation of radiator lock mechanism 500 have been omitted.

[0067] 3 and 4, when the radiator 30 is in the closed state, the lock pin 510 is positioned out of the lock pin drop hole 520 provided in the fixed flat plate 411. In this state, when the radiator 30 is rotated (opened sideways) in the clockwise direction (direction of arrow a) in FIG. 4(a), in conjunction with the rotation of the radiator 30, the movable flat plate 421 also rotates in the clockwise direction (direction of arrow a) with the pivot pin 430 as the rotation axis.

[0068] When the movable flat plate 421 rotates clockwise, the lock pin 510 moves along an arc on the upper surface 411a of the fixed flat plate 411 as indicated by the dashed arrow C in Fig. 4(a) with the lower end 511 in contact with the upper surface 411a of the fixed flat plate 411 by its own weight (see Fig. 4(b)). Then, when the radiator 30 rotates to a predetermined angle (75 degrees) and opens to the side at 75 degrees (see Fig. 5(a)), the lock pin 510 reaches the lock pin drop hole 520 provided in the fixed flat plate 411, and the lock pin 510 drops into the lock pin drop hole 520 (see Figs. 5(b) and 6).

[0069] When the lock pin 510 falls into the lock pin drop hole 520, the connecting plate 530 fixed to the lock pin 510 moves down along the shaft portion 434 of the pivot pin protrusion 431 together with the lock pin 510. Then, when the forked portion 531 of the connecting plate 530 comes into contact with the flange portion 433, the drop of the connecting plate 530 is restricted.

[0070] When the lock pin 510 falls into the lock pin drop hole 520, the lower end 511 of the lock pin 510 penetrates the lock pin drop hole 520 and protrudes downward from the lower surface 411b of the fixed flat plate 411 (see FIG. 5(b)). As shown in FIG. 5(b), when the lock pin 510 falls into the lock pin drop hole 520, the rotation of the radiator 30 is restricted, and the radiator 30 is locked in a sideways open state at a predetermined angle (75 degrees in this case).

[0071] Thus, according to the work vehicle 1 of this embodiment, the radiator lock mechanism 500 is provided to lock the rotation of the radiator 30 when the radiator 30 is in a side-open state at a predetermined angle (75 degrees), and therefore, when the radiator 30 is to be in a side-open state, the radiator 30 can be automatically locked in the side-open state simply by opening the radiator 30 to the predetermined angle. Therefore, when performing maintenance work, it is no longer necessary to hold the radiator 30 in the side-open state by hand so that it does not move in the closing direction (counterclockwise) or to fix the radiator 30 with a separately provided radiator lock member or the like, and maintenance work can be performed efficiently and safely.

[0072] Furthermore, when the maintenance work is completed and the radiator 30 is to be returned to the original closed state, the lock of the radiator can be easily released by simply lifting the lock pin 510 that has fallen into the lock pin drop hole 520 and removing it from the lock pin drop hole 520. In the work vehicle 1 according to the embodiment, the radiator lock mechanism 500 is provided in the upper hinge mechanism 40A of the two upper and lower hinge mechanisms 40A, 40B. Therefore, the position (height from the road surface) of the hinge mechanism 40A on which the radiator lock mechanism 500 is provided is at a height that is easy for the worker to operate, making it easy to perform the unlocking operation when releasing the lock.

[0073] In addition, a connecting plate 530 is fixed to the lock pin 510, and the connecting plate 530 is movable up and down between a head portion 432 and a flange portion 433 formed on the pivot pin protrusion portion 431. Therefore, the amount of movement of the lock pin 510 in the up and down direction is restricted between the head portion 432 and the flange portion 433. Therefore, even if the work vehicle 1 is shaken significantly by performing strenuous work such as digging the ground or moving excavated earth and sand, it is possible to reliably prevent the lock pin 510 from coming out of the movable flat plate 421. In addition, when the lock pin 510 falls into the lock pin drop hole 520, the connecting plate 530 abuts against the flange portion 433, so that further falling is restricted, and it is possible to reliably prevent the lock pin 510 from falling carelessly.

[0074] Furthermore, since the lock pin 510 is connected to the pivot pin 430 by the connecting plate 530, the lock pin 510 can always be held in an appropriate upright position (perpendicular to the upper surface 421a of the movable flat plate 421 and the upper surface 411a of the fixed flat plate 411). As a result, when the radiator 30 is in the side-open state, the lock pin 510 falls while maintaining the upright position, so that it can be reliably dropped into the lock pin drop hole 520.

[0075] Further, a bifurcated portion 531 is formed in the connecting plate 530, and the bifurcated portion 531 is configured to sandwich the shaft portion 434 of the pivot pin protruding portion 431. Therefore, even if the head portion 432 and the flange portion 433 have a larger diameter than the shaft portion 434 of the pivot pin protruding portion 431, the connecting plate 530 can be easily connected to the shaft portion 434 between the head portion 432 and the flange portion 433.

[0076] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention. For example, the following modifications are also possible.

[0077] (1) In the above embodiment, the rotation angle (predetermined angle) when the radiator 30 is opened to the side is set to 75 degrees, but it does not necessarily have to be 75 degrees. For example, when the radiator 30 is locked in a state where it is rotated 60 degrees, the position of the lock pin drop hole 520 may be set in the fixed flat plate 411 so that the radiator 30 is locked when the radiator 30 is rotated 60 degrees. In this way, the rotation angle when the radiator 30 is locked can be set by appropriately setting the position where the lock pin drop hole 520 is provided.

[0078] (2) In the above embodiment, the lock pin drop hole 520 is provided at one location, but a plurality of lock pin drop holes 520 may be formed at predetermined intervals on the arc along which the lock pin 510 moves. For example, if a first lock pin drop hole corresponding to the position the lock pin 510 reaches when the radiator 30 rotates 45 degrees, a second lock pin drop hole corresponding to the position the lock pin 510 reaches when the radiator 30 rotates 60 degrees, and a third lock pin drop hole corresponding to the position the lock pin reaches when the radiator 30 rotates 75 degrees are formed on the arc along which the lock pin moves, the radiator 30 can be locked at three rotation angles. In this case, the worker may select one of them depending on the contents of the maintenance work.

[0079] However, when dropping the lock pin into the second lock pin drop hole or the third lock pin drop hole, the worker needs to rotate radiator 30 while holding up lock pin 510 until lock pin 510 reaches the desired lock pin drop hole. However, as explained in the background art section above, this operation is easier than when the worker uses a separately prepared radiator locking member to lock the radiator while aligning it.

[0080] (3) In the above embodiment, the first hinge mechanism 40A of the two hinge mechanisms 40A, 40B has the radiator lock mechanism 500, but the second hinge mechanism 40B may have the lock mechanism 500, or each of the two hinge mechanisms 40A, 40B may have the radiator lock mechanism 500. In addition, in the above embodiment, the radiator 30 has two hinge mechanisms, but the present invention can of course be applied to a case where there are three or more hinge mechanisms. In a case where there are three or more hinge mechanisms, one of the three or more hinge mechanisms may have the radiator lock mechanism 500, or two or more hinge mechanisms may have the radiator lock mechanism 500.

[0081] (4) In the above embodiment, the present invention is applied to a crawler loader. However, the present invention can also be applied to work vehicles other than crawler loaders. [Explanation of symbols]

[0082] 1...work vehicle (crawler loader), 11...endless crawler, 12...traveling gear, 13...main body frame, 14...working gear, 15...cabin, 16...arm, 17...hydraulic cylinder (arm cylinder), 18...engine cover, 19...rear door, 30...radiator, 40A...hinge mechanism (first hinge mechanism), 40B...hinge mechanism (second hinge mechanism), 410...fixed hinge bracket, 411...fixed flat plate, 411a...upper surface of fixed flat plate 411, 411b...lower surface of fixed flat plate 411, 412...fixed flat plate (auxiliary fixed flat plate), 420...movable hinge bracket, 421... Movable fixed flat plate, 421a...upper surface of movable flat plate 421, 421b...lower surface of movable flat plate 421, 422...movable flat plate (auxiliary movable flat plate), 430...pivot support pin, 431...projection portion (pivot support pin projection portion) of pivot support pin 430, 432...head portion, 433...flange portion, 434...shaft portion of pivot support pin 430, 434a...lower end side projection portion of shaft portion 434, 500...radiator lock mechanism, 510...lock pin, 511...lower end portion of lock pin 510, 512...projection portion (lock pin projection portion) of lock pin 510, 520...lock pin drop hole, 530...connecting plate, 531...bifurcated portion of connecting plate 530

Claims

1. A work vehicle equipped with a radiator, The radiator is rotatable in the left-right direction by a plurality of hinge mechanisms provided along the up-down direction of the main body frame of the work vehicle, and can be opened to the side at a predetermined angle, At least one hinge mechanism of the plurality of hinge mechanisms comprises: a fixed flat plate that is fixed to the main body frame and has one surface that serves as an upper surface facing upward and the other surface that serves as a lower surface facing downward; a movable flat plate fixed to the radiator, one surface of which is an upper surface facing upward and the other surface of which is a lower surface facing downward; a pivot pin that pivotally supports the fixed flat plate and the movable flat plate by a shaft portion so that the movable flat plate can rotate relative to the fixed flat plate in a state in which the lower surface of the movable flat plate faces the upper surface of the fixed flat plate; a radiator lock mechanism that locks the rotation of the radiator when the radiator is in the sideways open state at the predetermined angle; Equipped with The radiator lock mechanism is a lock pin that passes through the movable flat plate so as to be vertically movable, is supported by the movable flat plate so that a lower end portion thereof can contact an upper surface of the fixed flat plate under its own weight, and moves in an arc on the upper surface of the fixed flat plate as the movable flat plate rotates; a lock pin drop hole that is provided in the fixed flat plate and through which the lock pin drops when the radiator is in the side-open state at the predetermined angle; A work vehicle comprising:

2. 2. The work vehicle according to claim 1, the pivot pin has a pivot pin protruding portion whose shaft portion protrudes upward from an upper surface of the movable flat plate, the upper end side of the pivot pin protruding portion has a head portion having a larger diameter than the shaft portion, and the movable flat plate side of the pivot pin protruding portion has a flange portion for restricting downward movement of the pivot pin, The lock pin has a lock pin protrusion that protrudes upward from an upper surface of the movable flat plate, and a connecting plate is fixed to the lock pin protrusion, extending toward the pivot pin protrusion and connected to the shaft portion of the pivot pin protrusion, and the connecting plate is capable of moving up and down along the shaft portion between the head and flange portion of the pivot pin protrusion in conjunction with the up and down movement of the lock pin.

3. The work vehicle according to claim 2, A work vehicle characterized in that the connecting plate has a forked portion formed at the tip side in the extension direction extending toward the axle support pin protrusion, and the forked portion is connected to the axle portion of the axle support pin protrusion.

4. In the work vehicle according to any one of claims 1 to 3, A work vehicle, wherein the radiator lock mechanism is provided in an uppermost hinge mechanism among the plurality of hinge mechanisms.

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