Front guards and work vehicles

Abstract

To swing a front guard from an upright position (a guard position) to an anteverted position (a retreat position) as an engine hood opens to prevent damage of the front guard.SOLUTION: A front guard attached to a vehicle body front part of a work vehicle includes: a lower frame to be attached to a vehicle body; and an upper frame which is attached so as to be swingable around an axis in a vehicle body width direction relative to the lower frame and swings relative to the lower frame to enable change of its position from an upright position and an anteverted position. The upper frame has: a left portion pivotally supported by a left part of the lower frame and extending upward; and a right portion pivotally supported by a right part of the lower frame and extending upward; and an upper portion connecting an upper part of the left portion with an upper part of the right portion. The upper portion is provided with a protruding part protruding downward.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a front guard attached to a work vehicle such as a tractor, and to a work vehicle equipped with the front guard. [Background technology]

[0002] A known front guard for a work vehicle is disclosed in Patent Document 1 below. This front guard has a lower frame attached to the vehicle body and an upper frame that can swing relative to the lower frame. The upper frame can be moved between a guard position in which it is raised to protect the hood, and a retracted position in which it is tilted forward relative to the lower frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-18324 Summary of the Invention [Problem to be solved by the invention]

[0004] In a work vehicle such as a tractor equipped with the above-described front guard, the operator may make an erroneous operation that causes the front guard to come into contact with a part of the work vehicle. For example, the operator may open the hood with the upper frame in the guard position. Also, the operator may lower the front loader attached to the front of the work vehicle, move the upper frame to the retracted position, and then raise the front loader. Also, the operator may raise the front loader, move the upper frame to the retracted position, and then lower the front loader. However, the above-mentioned publication does not disclose any measures to prevent such erroneous operation.

[0005] In view of the above circumstances, the present invention aims to provide a front guard and a work vehicle equipped with such a front guard that can prevent damage to the front guard even if an operator performs an incorrect operation that causes contact between the front guard and part of the work vehicle. [Means for solving the problem]

[0006] The present invention employs the following technical means to achieve the above object.

[0007] A front guard for a work vehicle according to one embodiment of the present invention is a front guard attached to the front of the body of a work vehicle, and comprises a lower frame attached to the body, and an upper frame attached so as to be swingable relative to the lower frame around an axis in the width direction of the body, and capable of changing its position between an upright position and a forward-leaning position by swinging relative to the lower frame, wherein the upper frame has a left portion pivoted to the left portion of the lower frame and extending upward, a right portion pivoted to the right portion of the lower frame and extending upward, and an upper portion connecting the upper portion of the left portion and the upper portion of the right portion, and the upper portion is provided with a protrusion that protrudes downward.

[0008] Preferably, a lower curved portion is formed in the lower portion of the left region and the lower portion of the right region, the lower curved portion being curved rearward as it extends downward.

[0009] Preferably, an upper curved portion is formed in the upper portion of the left region and the upper portion of the right region, the upper curved portion being curved rearward as it extends upward.

[0010] Preferably, an elastic member is provided on the rear surface of the protrusion.

[0011] A work vehicle according to one aspect of the present invention is a work vehicle comprising a vehicle body, a hood that can be opened and closed using the front of the vehicle body as a fulcrum, and a front guard attached to the vehicle body in front of the hood, wherein the front guard has a lower frame attached to the vehicle body and an upper frame that is attached so as to be swingable relative to the lower frame around an axis in the vehicle body width direction and can change its position between an upright position and a forward-leaning position by swinging relative to the lower frame, and the upper frame has a left section that is pivotally supported on the left section of the lower frame and extends upward, a right section that is pivotally supported on the right section of the lower frame and extends upward, and an upper section that connects the upper part of the left section and the upper part of the right section, and the upper section is provided with a protrusion that protrudes downward, and the protrusion is positioned to abut against the top surface of the hood when the hood is opened while the upper frame is in the upright position.

[0012] Preferably, when the hood is opened with the front guard in the upright position, the hood abuts against the protrusion, causing the upper frame to swing from the upright position to the forward tilted position.

[0013] Preferably, the protrusion is provided with an elastic member, which is positioned so as to come into contact with the upper surface of the hood when the hood is opened with the upper frame in the upright position. [Effects of the Invention]

[0014] According to the above-described front guard, even if the worker makes an erroneous operation that causes the front guard to come into contact with a part of the work vehicle, damage to the front guard can be prevented. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 10 is a side view illustrating the swing of the front guard. [Figure 6] FIG. [Figure 7] FIG. 10 is a vertical cross-sectional view of the front guard with the upper frame in the guard position (standing position). [Figure 8] FIG. 10 is a vertical cross-sectional view of the front guard with the upper frame in a retracted position (forward tilted position). [Figure 9] FIG. [Figure 10] FIG. 10 is a diagram showing a state in which the upper frame is in a guard position (standing position) and the hood is closed. [Figure 11] 11 is a diagram showing a state in which the hood is open from the state shown in FIG. 10. FIG. [Figure 12] FIG. 12 is a diagram showing a state in which the hood is further opened from the state shown in FIG. 11. [Figure 13] FIG. 10 is a diagram showing a state in which the front loader is lowered with the upper frame in the retracted position (forward tilted posture). [Figure 14] FIG. 14 is a diagram showing a state in which the front loader is being raised from the state shown in FIG. 13. [Figure 15] FIG. 15 is a diagram showing a state in which the front loader is further raised from the state in FIG. 14. [Figure 16] FIG. 10 is a diagram showing a state in which the front loader is raised with the upper frame in the retracted position (forward tilted posture). [Figure 17] FIG. 17 is a diagram showing a state in which the front loader is being lowered from the state in FIG. 16. [Figure 18] FIG. 18 is a diagram showing a state in which the front loader is further lowered from the state in FIG. 17. [Figure 19] FIG. 2 is a plan view showing the positional relationship between the front guard and the front loader. [Figure 20] FIG. [Figure 21] FIG. 1 is a side view of a work vehicle equipped with a front guard. [Figure 22] FIG. 1 is a side view of a work vehicle equipped with a front guard and a front loader. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <Work vehicle> First, a work vehicle 1 to which a front guard according to the present invention is attached will be described. Fig. 21 is a side view showing one embodiment of the work vehicle 1. In this embodiment, the work vehicle 1 is a tractor. However, the work vehicle 1 according to the present invention is not limited to tractors, and may be other types of work vehicles.

[0017] In the following description, the front side of the driver seated in the driver's seat 5 of the work vehicle 1 (left side in FIG. 21) will be referred to as the front, the rear side of the driver (right side in FIG. 21) will be referred to as the rear, the left side of the driver (near side of the paper in FIG. 21) will be referred to as the left side, and the right side of the driver (far side of the paper in FIG. 21) will be referred to as the right side. In addition, the horizontal direction that is perpendicular to the fore-and-aft direction of the work vehicle 1 will be referred to as the vehicle body width direction. In addition, the direction in the vehicle body width direction that is away from the center of the vehicle body width direction will be referred to as the vehicle body outward, and the direction in the vehicle body width direction that is closer to the center of the vehicle body width direction will be referred to as the vehicle body inward.

[0018] As shown in FIG. 21, the work vehicle 1 includes a vehicle body 2 and a traveling device 3. A cabin 4 is mounted on the vehicle body 2. A driver's seat 5 is provided inside the cabin 4. A steering wheel 6 is disposed in front of the driver's seat 5. An operating lever 7 is disposed to the side of the driver's seat 5. The traveling device 3 has front wheels 3F provided at the front of the vehicle body 2 and rear wheels 3R ​​provided at the rear of the vehicle body 2.

[0019] An engine (not shown) is mounted in the front of the vehicle body 2, and the top and sides of the engine are covered by a hood 25. The hood 25 can be opened and closed using the front of the vehicle body 2 as a fulcrum. A raised portion 25a is provided on the top surface of the hood 25. The raised portion 25a is provided in the center of the hood 25 in the vehicle width direction. A clutch housing, a transmission case, etc. are provided in the rear of the vehicle body 2.

[0020] The vehicle body 2 has a front axle frame 9 fixed to the underside of the engine. The front axle frame 9 has a front plate member 9a and side plate members 9b. The front plate member 9a is located in the front lower part of the vehicle body 2 and extends in the vehicle body width direction. The side plate members 9b are located on the left and right sides of the vehicle body 2 and extend in the front-to-rear direction. The front end of the left side plate member 9b and the front end of the right side plate member 9b are connected by the front plate member 9a. The front axle frame 9 supports a front axle case 10. The front axle case 10 supports the axles of the front wheels 3F.

[0021] As shown in Figure 21, a front guard 30 is attached to the front of the vehicle body 2. The front guard 30 is attached to the front axle frame 9. The configuration of the front guard 30 will be described later. Figure 22 is a side view showing a state in which a front loader 12 is attached to the front of the body 2 of the work vehicle 1 shown in Figure 21. That is, the work vehicle 1 shown in Figure 22 has the front loader 12 and front guard 30 attached to the front of the body 2.

[0022] FIG. 19 is a plan view showing the front loader 12 together with the front guard 30, and FIG. 20 is a bottom view of the front loader 12. As shown in FIG. The front loader 12 includes a mounting body 13, a boom 15, a bucket 16, a boom cylinder 17, and a bucket cylinder 18. The mounting body 13 includes first mounting members 131L and 131R, second mounting members 132L and 132R, The housing has third mounting members 133L and 133R and fourth mounting members 134L and 134R.

[0023] The first mounting members 131L, 131R are plate-shaped members and are attached to the sides of the vehicle body 2. Specifically, the first mounting member 131L is attached to the left side plate member 9b. The first mounting member 131R is attached to the right side plate member 9b. The second mounting members 132L, 132R are cylindrical members that are attached to the first mounting members 131L, 131R and extend in the vehicle body width direction. One end (right end) of the second mounting member 132L is attached to the first mounting member 131L and extends from the first mounting member 131L toward the vehicle body exterior (left). One end (left end) of the second mounting member 132R is attached to the first mounting member 131R and extends from the first mounting member 131R toward the vehicle body exterior (right).

[0024] The third mounting members 133L, 133R are plate-shaped members and are attached to the second mounting members 132L, 132R. The third mounting member 133L is attached to the other end (left end) of the second mounting member 132L. The third mounting member 133R is attached to the other end (right end) of the second mounting member 132R. The fourth mounting members 134L, 134R are attached to the third mounting members 133L, 133R. The fourth mounting member 134L is attached to the third mounting member 133L and extends upward. The fourth mounting member 134R is attached to the third mounting member 133R and extends upward. A pivot 20 extending in the vehicle body width direction is provided on the upper part of each of the fourth mounting members 134L, 134R.

[0025] The boom 15 includes a left boom 15L and a right boom 15R. The left boom 15L is supported by a fourth mounting member 134L. The right boom 15R is supported by a fourth mounting member 134R. A midpoint of the left boom 15L and a midpoint of the right boom 15R are connected to each other by a connector 29. The base end of the boom 15 is supported so as to be swingable about a pivot 20 provided on the fourth mounting members 134L, 134R. A pivot 21 extending in the vehicle width direction is provided on the tip end of the boom 15.

[0026] The boom cylinder 17 connects the fourth mounting members 134L, 134R and the boom 15. One end (tip end) of the boom cylinder 17 is rotatably supported via a first horizontal shaft 22 at a vertical midpoint of the fourth mounting members 134L, 134R. The other end (base end) of the boom cylinder 17 is rotatably supported via a second horizontal shaft 23 at a longitudinal midpoint of the boom 15. The boom 15 swings upward about the pivot 20 when the boom cylinder 17 is extended, and swings downward about the pivot 20 when the boom cylinder 17 is retracted. Therefore, the front loader 12 can be raised or lowered by extending or contracting the boom cylinder 17.

[0027] The bucket 16 is supported so as to be swingable about a pivot 21. The bucket cylinder 18 connects the bucket 16 and the boom 15. One end (base end) of the bucket cylinder 18 is rotatably supported via a third horizontal shaft 26 to the mounting fixture 14 attached to a connecting body 29. The other end (tip end) of the bucket cylinder 18 is rotatably supported via a link mechanism to the bucket 16 via a fourth horizontal shaft 27 and the like. The bucket cylinder 18 operates the bucket 16. The bucket 16 performs a scooping motion about the pivot 21 when the bucket cylinder 18 is contracted, and performs a dumping motion about the pivot 21 when the bucket cylinder 18 is extended.

[0028] As shown in Figures 19, 20, and 22, the boom 15 is provided with a stand 80. The stand 80 can rest on the ground when the front loader 12 is lowered. The stand 80 can rotate upward or downward around a support shaft 19 provided at the front of the boom 15 as a fulcrum. When the front loader 12 is lowered, the stand 80 can rest on the ground by rotating downward around the support shaft 19 as a fulcrum (see arrow A in Figure 22). By resting on the ground when the front loader 12 is lowered, the stand 80 can support the front loader 12 on the ground.

[0029] 22, the stand 80 can be fixed in a position (storage position) in which it is rotated upward around the support shaft 19. When in the storage position, the stand 80 extends in the front-to-rear direction so as to substantially follow the boom 15. As shown in Figure 20 etc., the stand 80 has a left leg 81L, a right leg 81R, and a connecting part 81M. The left leg 81L and the right leg 81R are attached to the boom 15 via a support shaft 19 and a connecting member 39. The left leg 81L is attached to the left boom 15L. The right leg 81R is attached to the right boom 15R. Hereinafter, the left leg 81L and the right leg 81R may be collectively referred to as legs 81.

[0030] As shown in Fig. 16, a pin 78 is fixed to the rear of a leg 81 of the stand 80. A hook member 79 capable of engaging the pin 78 is attached to the boom 15. As shown in Fig. 16, by engaging the pin 78 with the hook member 79, the stand 80 can be held in the storage position. Furthermore, by releasing the pin 78 from the hook member 79, the stand 80 can be rotated downward with the support shaft 19 as a fulcrum.

[0031] 22, when the stand 80 is in the storage position, the left leg 81L extends in the front-to-rear direction below the left boom 15L, and the right leg 81R extends in the front-to-rear direction below the right boom 15R. As shown in FIGS. 19 and 20, the distance between the rear portion 81Lb of the left leg 81L and the rear portion 81Rb of the right leg 81R is wider than the distance between the front portion 81La of the left leg 81L and the front portion 81Ra of the right leg 81R.

[0032] As shown in FIG. 20, the connecting portion 81M connects the left leg 81L and the right leg 81R. The connecting portion 81M extends in the vehicle body width direction. As shown in FIGS. 13 and 19, the connecting portion 81M has a lower portion 81Ma and a rear portion 81Mb. The left end of the lower portion 81Ma is connected to the left leg 81L, and the right end is connected to the right leg 81R. The rear portion 81Mb bends from the rear end of the lower portion 81Ma and extends upward and rearward. As shown in FIG. 13, when the front loader 12 is lowered and the stand 80 is in the storage position, the rear portion 81Mb is inclined so that it slopes forward as it extends upward.

[0033] Figure 19 is a plan view showing the positional relationship between the front guard 30 and the front loader 12 when the front loader 12 is lowered. In Figure 19, the front guard 30 is in a guard position (standing posture) described below, and the stand 80 is in a stored position. 19, the front guard 30 is located between the left boom 15L and the right boom 15R of the front loader 12. The front guard 30 is also located between the left leg 81L and the right leg 81R (between the rear portions 81Lb and 81Rb) of the stand 80. The front guard 30 is also located rearward of the connecting portion 81M. <Front guard> Next, the front guard 30 attached to the work vehicle 1 will be described.

[0034] 21 and 22, the front guard 30 is attached to the front of the vehicle body 2 of the work vehicle 1. The front guard 30 is disposed in front of the hood 25 of the work vehicle 1, and protects the front of the hood 25. As shown in Figures 1 to 4, the front guard 30 includes a lower frame 31 and an upper frame 41. The lower frame 31 is attached to the body 2 of the work vehicle 1. The upper frame 41 is attached to the lower frame 31. As shown in Figure 5, the upper frame 41 can swing relative to the lower frame 31, thereby changing its position between an upright position (see solid lines) and a forward-leaning position (see imaginary lines).

[0035] In the following explanation, the directions regarding the front guard 30 and the positional relationship of the components of the front guard 30 are based on the state in which the front guard 30 is attached to the vehicle body 2 and the upper frame 41 is in an upright position (the state shown in Figures 21 and 22). First, the lower frame 31 will be described with reference to Figures 1 to 4. The lower frame 31 has a symmetrical (bilaterally symmetrical) shape across the center line in the vehicle body width direction.

[0036] The lower frame 31 has a left lower member 32L, a right lower member 32R, and a front lower member 32F. The left lower member 32L is disposed on the left side in the front of the vehicle body 2. The right lower member 32R is disposed on the right side in the front of the vehicle body 2. The left lower member 32L is disposed so that one surface (the surface facing outward from the vehicle body) faces left and the other surface (the surface facing inward from the vehicle body) faces right. The right lower member 32R is disposed so that one surface (the surface facing outward from the vehicle body) faces right and the other surface (the surface facing inward from the vehicle body) faces left.

[0037] The front lower member 32F connects the lower part of the left lower member 32L and the lower part of the right lower member 32R. The front lower member 32F is attached to the front plate member 9a of the front axle frame 9. Specifically, the front lower member 32F is attached to the front part of the front plate member 9a with a bolt BL1. The left lower member 32L has a left base portion 33L and a left extension portion 34L. The left base 33L is located at the bottom of the left lower member 32L. The left base 33L is connected to the left portion of the front lower member 32F and extends upward from that left portion. The left base 33L is inclined forward as it extends upward. A left pivot shaft 55L is inserted through the left base 33L. The left pivot shaft 55L extends in the vehicle body width direction. The left pivot shaft 55L is also inserted through a left portion 42L of the upper frame 41, which will be described later.

[0038] The left extending portion 34L has a lower-left extending portion 34La and an upper-left extending portion 34Lb. The lower-left extending portion 34La extends obliquely upward and to the left from the front portion of the left base portion 33L. The upper-left extending portion 34Lb extends upward from the upper end of the lower-left extending portion 34La. The right lower member 32R has a right base portion 33R and a right extension portion 34R. The right base 33R is located at the bottom of the right lower member 32R. The right base 33R is connected to the right portion of the front lower member 32F and extends upward from that right portion. The right base 33R is inclined so as to face forward as it extends upward. A right pivot 55R is inserted through the right base 33R. The right pivot 55R extends in the vehicle body width direction. The right pivot 55R is also inserted through a right portion 42R of the upper frame 41, which will be described later.

[0039] The right extending portion 34R has a lower right extending portion 34Ra and an upper right extending portion 34Rb. The lower right extending portion 34Ra extends obliquely upward and to the right from the front portion of the right base portion 33R. The upper right extending portion 34Rb extends upward from the upper end of the lower right extending portion 34Ra. Hereinafter, the left extending portion 34L and the right extending portion 34R may be collectively referred to as the extending portion 34. Furthermore, the left pivot 55L and the right pivot 55R may be collectively referred to as the pivot 55.

[0040] As shown in FIG. 1, the left base portion 33L and the right base portion 33R are arranged parallel to each other. The upper-left extension portion 34Lb and the upper-right extension portion 34Rb are also arranged parallel to each other. The distance between the upper-left extension portion 34Lb and the upper-right extension portion 34Rb is larger than the distance between the left base portion 33L and the right base portion 33R. The distance between the upper end of the lower-left extension portion 34La and the upper end of the lower-right extension portion 34Ra is larger than the distance between the lower end of the lower-left extension portion 34La and the lower end of the lower-right extension portion 34Ra. The distance between the lower-left extension portion 34La and the lower-right extension portion 34Ra gradually increases from bottom to top.

[0041] The upper frame 41 is attached to the lower frame 31 so as to be swingable about an axis in the vehicle width direction. Specifically, the upper frame 41 is attached to the lower frame 31 so as to be swingable about a left pivot shaft 55L and a right pivot shaft 55R. In other words, the pivot shafts 55 (left pivot shaft 55L, right pivot shaft 55R) support the upper frame 41 swingably relative to the lower frame 31. Next, a description will be given of the upper frame 41. The upper frame 41 has a symmetrical (bilaterally symmetrical) shape across the center line in the vehicle body width direction.

[0042] The upper frame 41 has a vertical portion 42 extending upward. The vertical portion 42 includes a left portion 42L and a right portion 42R. The upper portion of the left portion 42L and the upper portion of the right portion 42R are connected by an upper portion 43. The left portion 42L, the right portion 42R, and the upper portion 43 are integrally formed from a single member. Specifically, the left portion 42L, the right portion 42R, and the upper portion 43 are formed by bending a single plate material.

[0043] The left portion 42L is pivotally supported on the left portion (lower-left member 32L) of the lower frame 31 and extends upward. The left portion 42L is located on the vehicle body interior side (right side) of the lower-left member 32L. The right portion 42R is pivotally supported on the right portion (lower-right member 32R) of the lower frame 31 and extends upward. The right portion 42R is located on the vehicle body interior side (left side) of the lower-right member 32R. The left portion 42L has a lower-left portion 42La, a left intermediate portion 42Lb, and an upper-left portion 42Lc. The lower-left portion 42La is attached to the lower-left member 32L and extends upward. The left intermediate portion 42Lb extends obliquely upward from the upper end of the lower-left portion 42La, transitioning toward the outside (left side) of the vehicle body. The upper-left portion 42Lc extends upward from the upper end of the left intermediate portion 42Lb to the upper portion 43.

[0044] The right portion 42R has a lower right portion 42Ra, a right intermediate portion 42Rb, and an upper right portion 42Rc. The lower right portion 42Ra is attached to the lower right member 32R and extends upward. The right intermediate portion 42Rb extends obliquely upward from the upper end of the lower right portion 42Ra, transitioning toward the outside (right side) of the vehicle body. The upper right portion 42Rc extends upward from the upper end of the right intermediate portion 42Rb to the upper portion 43.

[0045] As shown in FIG. 1, the lower-left region 42La and the lower-right region 42Ra are arranged parallel to each other. The upper-left region 42Lc and the upper-right region 42Rc are also arranged parallel to each other. The distance between the upper-left region 42Lc and the upper-right region 42Rc is larger than the distance between the lower-left region 42La and the lower-right region 42Ra. The distance between the upper end of the left intermediate region 42Lb and the upper end of the right intermediate region 42Rb is larger than the distance between the lower end of the left intermediate region 42Lb and the lower end of the right intermediate region 42Rb. The distance between the left intermediate region 42Lb and the right intermediate region 42Rb gradually increases from bottom to top.

[0046] The left portion 42L is attached to the lower-left member 32L so as to be pivotable about an axis in the vehicle width direction. Specifically, a lower-left portion 42La of the left portion 42L is attached to the lower-left member 32L so as to be pivotable about a left pivot shaft 55L. The left pivot shaft 55L is inserted through the lower-left portion 42La and the left base portion 33L. The right portion 42R is attached to the lower right member 32R so as to be able to swing about an axis in the vehicle width direction. Specifically, a lower right portion 42Ra of the right portion 42R is attached to the lower right member 32R so as to be able to swing about a right pivot shaft 55R. The right pivot shaft 55R is inserted through the lower right portion 42Ra and the right base portion 33R.

[0047] The left portion 42L swings about the left pivot shaft 55L relative to the left lower member 32L, and the right portion 42R swings about the right pivot shaft 55R relative to the right lower member 32R, whereby the upper frame 41 swings about the lower frame 31. 5. When the upper frame 41 is in the upright position, it is positioned close to the front surface of the hood 25 (guard position P1). When the upper frame 41 is in the forward-leaning position, it is positioned forward and away from the front surface of the hood 25 (retracted position P2).

[0048] 5 and 10, when the upper frame 41 is in the guard position P1 (upright position), the rear edges of the vertical portions 42 of the upper frame 41 are curved so as to be close to and generally follow the front surface of the hood 25. Specifically, when the upper frame 41 is in the guard position P1, the rear edges of the left portion 42L and the right portion 42R are curved so as to be close to and generally follow the front surface of the hood 25 in a side view.

[0049] The upper portion 43 extends in the vehicle body width direction. As shown in Fig. 1, the boundary between the upper portion 43 and the left portion 42L and the boundary between the upper portion 43 and the right portion 42R are each formed in a rounded (arcuate) shape. This makes it difficult for stress to concentrate at the boundary, improving the strength of the upper frame 41. Furthermore, when another object collides with the upper end of the front guard 30, the object can be prevented from being damaged.

[0050] As shown in FIGS. 1, 2, and 4, the upper portion 43 is provided with a protruding portion 44 that protrudes downward. The protruding portion 44 protrudes downward from the center of the upper portion 43 in the vehicle width direction. As shown in FIG. 2, the protruding portion 44 extends downward from the rear edge of the upper portion 43. The protruding portion 44 is inclined so as to transition forward as it extends downward. In addition, in a side view, the protruding portion 44 is located rearward of the rear edges of the vertical portions 42 (upper-left portion 42Lc, upper-right portion 42Rc) and extends approximately along the rear edges. The protruding portion 44 is formed in a plate shape that is longer in the left-right direction than in the up-down direction. In this embodiment, the protruding portion 44 is provided integrally with the upper portion 43; however, the protruding portion 44 may be separate from the upper portion 43 and attached to the upper portion 43 with bolts or the like. The protruding portion 44 is provided with an elastic member 46. The elastic member 46 is, for example, rubber, soft resin, or the like. The elastic member 46 is provided on at least the rear surface of the protruding portion 44. In the present embodiment, the elastic member 46 is provided so as to cover the front surface, the lower surface, and the rear surface of the protruding portion 44.

[0051] The upper portion 43 is provided with a protrusion 44 that protrudes downward, allowing the worker to hold the protrusion 44 when changing the upper frame 41 from an upright position to a forward-leaning position. In other words, the protrusion 44 can function as a handle when changing the position of the upper frame 41. By holding the protrusion 44, the worker can easily change the upper frame 41 from an upright position to a forward-leaning position.

[0052] As shown in FIGS. 1, 3, and 4, the upper frame 41 has a connecting member 45. The connecting member 45 connects the left portion 42L and the right portion 42R below the upper portion 43. The connecting member 45 connects the upper-left portion 42Lc and the upper-right portion 42Rc. The connecting member 45 is a flat plate-shaped member, and is arranged so that one surface faces substantially forward and the other surface faces substantially rearward. The connecting member 45 has a left plate portion 45a, a right plate portion 45b, and an intermediate plate portion 45c. The left plate portion 45a, the right plate portion 45b, and the intermediate plate portion 45c are formed from a single plate material. The left plate portion 45a extends rightward from the upper-left portion 42Lc and transitions downward and forward as it extends rightward. The right plate portion 45b extends leftward from the upper-right portion 42Rc and transitions downward and forward as it extends leftward. The intermediate plate portion 45c connects the left plate portion 45a and the right plate portion 45b. As shown in FIG. 3, the connecting member 45 is located forward of the upper portion 43 over the entire length in the vehicle body width direction.

[0053] As shown in FIG. 2, the vertical portion 42 of the upper frame 41 has an upper curved portion 42a and a lower curved portion 42b. The upper curved portion 42a and the lower curved portion 42b are formed on the front edge of the vertical portion 42. There are. The upper curved portion 42a is formed at the upper portion of the upper frame 41 (at the upper portion of the vertical portion 42). Specifically, the upper curved portion 42a is formed at the upper portion of the left portion 42L and the upper portion of the right portion 42R. More specifically, the upper curved portion 42a is formed at the upper portion of the upper-left portion 42Lc and the upper portion of the upper-right portion 42Rc.

[0054] The lower curved portion 42b is formed in the lower portion of the upper frame 41 (the lower portion of the vertical portion 42). Specifically, the lower curved portion 42b is formed in the lower portion of the left portion 42L and the lower portion of the right portion 42R. More specifically, the lower curved portion 42b is formed in the lower portion of the upper-left portion 42Lc and the lower portion of the upper-right portion 42Rc. The upper curved portion 42a and the lower curved portion 42b are continuous and form the front edges of the vertical portions 42 (the left portion 42L and the right portion 42R). The upper curved portion 42a curves upward and gradually shifts rearward. The lower curved portion 42b curves downward and gradually shifts rearward.

[0055] As shown in Figures 1, 2, and 4, the pivots 55 (left pivot 55L, right pivot 55R) are formed by headed bolts and penetrate the upper frame 41 and the lower frame 31 (specifically, the left lower portion 42La and the left base portion 33L, and the right lower portion 42Ra and the right base portion 33R) in the vehicle width direction. As shown in FIG. 6 , the pivot 55 passes through a pair of first plain washers 52, a disc spring 53, and a pair of second plain washers 54. The pair of first plain washers 52 are arranged with the extension portion 34 sandwiched between them. The disc spring 53 is arranged on the vehicle body interior side of the vertical portion 42. The pair of second plain washers 54 are arranged with the disc spring 53 sandwiched between them. A tightening nut NT1 and a lock nut NT2 are threadedly engaged with the threaded portion of the pivot 55. The tightening nut NT1 abuts against the second flat washer 54 from the vehicle body interior side.

[0056] By tightening the tightening nut NT1, the position of the upper frame 41 relative to the lower frame 31 can be fixed. By loosening the tightening nut NT1, the upper frame 41 can be swung relative to the lower frame 31, thereby changing the position of the upper frame 41. When the tightening force of the tightening nut NT1 is small, the upper frame 41 can swing relative to the lower frame 31, and the swing position of the upper frame 41 relative to the lower frame 31 is maintained by the force applied by the disc spring 53. Therefore, if an unintended external force acts on the upper frame 41, the upper frame 41 can swing in response to the external force, and the swing position at the time when the external force ceases to act is maintained. This prevents damage to the front guard 30 when an unintended external force is applied to the upper frame 41 due to an operator's incorrect operation, etc.

[0057] 1, 2, and 4, the front guard 30 has a restriction mechanism 60 that restricts the swing range of the upper frame 41 relative to the lower frame 31. The restriction mechanism 60 restricts the swing range of the upper frame 41 to a range between the guard position P1 and the retracted position P2. The restriction mechanisms 60 are provided on the left and right sides of the front guard 30. The restriction mechanisms 60 have a restriction portion 61 and a stopper plate 62. The restriction portion 61 is formed on the lower part of the upper frame 41.

[0058] 7, the restricting portion 61 has a first restricting surface 61a and a second restricting surface 61b. The first restricting surface 61a faces rearward and extends substantially in the up-down direction. The second restricting surface 61b faces downward and extends substantially in the front-rear direction. An upper portion of the first restricting surface 61a and a front portion of the second restricting surface 61b are connected via an arc-shaped surface. The stopper plate 62 is a rectangular plate in a side view. The stopper plate 62 is fixed to the inner surfaces of the left base portion 33L and the right base portion 33R on the vehicle body side. The stopper plate 62 extends upward. It is tilted so that it moves forward as the vehicle moves.

[0059] As shown in FIG. 7, when the upper frame 41 is in the guard position P1, the stopper plate 62 is in a position where it does not abut against the restricting portion 61. As shown in FIG. 8, when the upper frame 41 is swung from the guard position P1 to the retracted position P2, the stopper plate 62 abuts against the first restricting surface 61a of the restricting portion 61. This restricts the upper frame 41 from swinging forward beyond the retracted position P2. When the upper frame 41 swings rearward from the guard position P1, the stopper plate 62 abuts against the second restricting surface 61b of the restricting portion 61. This restricts the upper frame 41 from swinging rearward far beyond the guard position P1.

[0060] 1 and 7 to 9, the front guard 30 has a holding mechanism 70 that holds the upper frame 41 at the guard position. As shown in Fig. 9, the holding mechanism 70 has a pin 71, a receiving member 72, a first member 73, a second member 74, and a third member 75. The pins 71 are fixed to the vertical portions 42 of the upper frame 41. The pins 71 are fixed to the left portion 42L and the right portion 42R, respectively, and extend in the vehicle width direction. One pin 71 extends rightward from the left portion 42L. The other pin 71 extends leftward from the right portion 42R. The pins 71 are shaped like a cylinder or a polygonal prism (hexagonal, octagonal, etc.). The pins 71 are fixed to the lower rear portion of the upper left portion 42Lc and the lower rear portion of the upper right portion 42Rc, respectively.

[0061] The receiving member 72 is made of a flexible plate material (such as a thin metal plate). The receiving member 72 has an upper plate 72a, a lower plate 72b, and a rear plate 72c. The upper plate 72a and the lower plate 72b are arranged approximately parallel to each other with a gap between them in the up-down direction and extend in the front-rear direction. The rear plate 72c connects the rear end of the upper plate 72a to the rear end of the lower plate 72b. The receiving member 72 has a wide portion 72d where the gap between the upper plate 72a and the lower plate 72b is wide. The wide portion 72d is a portion where the gap between the upper plate 72a and the lower plate 72b is wider than other portions (hereinafter referred to as "narrow portion"). Two wide portions 72d are provided. One wide portion 72d is provided between the front end of the upper plate 72a and the front end of the lower plate 72b. The other wide portion 72d is provided between a midpoint in the front-rear direction of the upper plate 72a and a midpoint in the front-rear direction of the lower plate 72b. The spacing between the wide portions 72d is set to be equal to or greater than the outer diameter of the pin 71. The spacing between the narrow portions is set to be smaller than the outer diameter of the pin 71. The receiving member 72 is fixed to the first member 73.

[0062] The first member 73 is a plate-shaped member with one surface facing forward and the other surface facing backward. A rear plate 72c of the receiving member 72 is fixed to one surface. The first member 73 is fixed to the second member 74. The second member 74 is fixed to the lower frame 31. The second member 74 has a fixing portion 74a and an attachment portion 74b. The fixing portion 74a is fixed to the surface of the extending portion 34 (upper-left extending portion 34Lb, upper-right extending portion 34Rb) of the lower frame 31 facing inward into the vehicle body. The attachment portion 74b bends from the rear end of the fixing portion 74a and extends inward into the vehicle body. The attachment portion 74b is plate-shaped, with one surface facing forward and the other surface facing rearward. The first member 73 is attached to one surface (the front surface).

[0063] The third member 75 is attached to the other surface (rear surface) of the attachment portion 74b. The first member 73 and the third member 75 are attached to the attachment portion 74b with a bolt BL2 and a nut NT3. 8, when the upper frame 41 is in the retracted position P2, the pin 71 is located forward away from the receiving member 72 and is not held by the receiving member 72. In this state, the upper frame 41 can swing rearward.

[0064] When the upper frame 41 swings rearward from the state shown in FIG. 8, the pin 71 hits one of the wide portions 72d of the receiving member 72, and then swings rearward while widening the gap between the upper plate 72a and the lower plate 72b. When the upper frame 41 reaches the guard position P1 (see FIG. 7), the pin 71 is held by the other wide portion 72d (see FIG. 9), and the upper frame 41 stops swinging backward. In this state, the pin 71 is sandwiched between the upper plate 72a and the lower plate 72b from above and below, and the upper frame 41 is held at the guard position P1. Therefore, the upper frame 41 will not swing unless an external force is applied to the upper frame 41.

[0065] When an external force is applied to swing the upper frame 41 forward from the state shown in Figure 7, the pin 71 moves forward while pushing the narrow portion of the receiving member 72 wider, and is released from the receiving member 72. This allows the upper frame 41 to swing forward. The front guard 30 according to the present invention has the feature of being able to prevent damage to the front guard 30 even if the worker makes an erroneous operation that causes the front guard 30 to come into contact with a part of the work vehicle 1. This feature will be described in detail below.

[0066] As an example of an erroneous operation, the hood 25 may be opened when the upper frame 41 is in the guard position (standing position). This case will be described below. 10 shows a state in which the upper frame 41 is in the guard position (upright posture) and the hood 25 is closed. In this state, the upper end 30a of the front guard 30 is located lower than the upper end of the raised portion 25a of the hood 25. In addition, the lower end 44a of the protruding portion 44 is located higher than the upper end 25b of the front edge of the hood 25. In addition, the protruding portion 44 is located rearward of the front end of the hood 25.

[0067] When the hood 25 is opened from the state shown in FIG. 10 , the upper surface of the hood 25 abuts against the protrusion 44. Specifically, the raised portion 25a provided on the upper surface of the hood 25 abuts against the rear surface of the protrusion 44. In other words, when the hood 25 is opened with the upper frame 41 in the guard position (standing posture), the protrusion 44 is in a position where it abuts against the upper surface (raised portion 25a) of the hood 25. In other words, when the hood 25 is opened with the upper frame 41 in the guard position (standing posture), the protrusion 44 is located on the movement trajectory of the upper surface (raised portion 25a) of the hood 25.

[0068] When the hood 25 is further opened with the protrusion 44 in contact with the upper surface of the hood 25, the upper frame 41 is pushed forward by the hood 25 and swings from the guard position (upright position) to the retracted position (forward leaning position) (see FIG. 11). When the hood 25 is further opened from the state of FIG. 11 to a completely open state, the upper frame 41 is further pushed forward by the hood 25 and moves to the retracted position (forward leaning position) (see FIG. 12).

[0069] As described above, even if the hood 25 is opened while the upper frame 41 is in the guard position (standing position), the protrusions 44 come into contact with the upper surface of the hood 25 and are pushed forward as the hood 25 is opened, causing the upper frame 41 to swing from the guard position (standing position) to the retracted position (forward tilted position). This prevents excessive force from acting on the front guard 30, preventing damage to the front guard 30. Furthermore, since the elastic members 46 are provided on the protrusions 44, damage to the hood 25 and front guard 30 can be prevented when the upper surface of the hood 25 comes into contact with the protrusions 44.

[0070] In the above example, the protrusion 44 comes into contact with the raised portion 25a provided on the upper surface of the hood 25, but the raised portion 25a on the upper surface of the hood 25 may be omitted. In this case, when the hood 25 is opened with the front guard 30 in the upright position, the protrusion 44 comes into contact with the upper surface of the hood 25 where the raised portion 25a is not present. Another example of an erroneous operation is when the front loader 12 is raised while the upper frame 41 is in the retracted position (forward tilted posture). This case will be described below.

[0071] 13 shows a state in which the front loader 12 is lowered with the upper frame 41 in the retracted position (forward tilted posture). In this state, a part of the front loader 12 (the connecting portion 81M of the stand 80) is located in front of the front guard 30 and is not in contact with the front guard 30. When the front loader 12 is raised from the state shown in FIG. 13, part of the front loader 12 comes into contact with the lower curved portion 42b (see FIG. 14). Here, part of the front loader 12 is the stand 80. Specifically, part of the front loader 12 is the connecting portion 81M of the stand 80. More specifically, part of the front loader 12 is the rear portion 81Mb of the connecting portion 81M of the stand 80.

[0072] In other words, the lower curved portion 42b has a portion (hereinafter referred to as the "first lower portion 42b1") that comes into contact with a part of the front loader 12 (the connecting portion 81M) when the front loader 12 is raised with the upper frame 41 in the retracted position (forward leaning posture). The first lower portion 42b1 is located on the movement trajectory of the part of the front loader 12 (the connecting portion 81M) when the front loader 12 is raised with the upper frame 41 in the retracted position (forward leaning posture). The first lower portion 42b1 is the portion that comes into contact first with a part of the front loader 12 (the connecting portion 81M of the stand 80) when the front loader 12 is raised with the upper frame 41 in the retracted position (forward leaning posture).

[0073] 2 and 14, the lower curved portion 42b has a second lower portion 42b2 that curves forward as it extends upward from the first lower portion 42b1. As shown in Fig. 14, the second lower portion 42b2 curves forward as it extends upward from the first lower portion 42b1 when the upper frame 41 is in the retracted position (forward leaning posture). Also, as shown in Fig. 2, the second lower portion 42b2 curves forward as it extends upward from the first lower portion 42b1 when the upper frame 41 is in the guard position (upright posture).

[0074] When the front loader 12 is further raised from the state shown in FIG. 14, a part of the front loader 12 (the connecting portion 81M) moves upward from the first lower portion 42b1 along the second lower portion 42b2. Accordingly, the upper frame 41 is pushed rearward by a part of the front loader 12 (the connecting portion 81M), and swings from the retracted position (forward leaning position) toward the guard position (standing position) (see FIG. 15). Then, when the front loader 12 is further raised from the state shown in FIG. 15, a part of the front loader 12 (the connecting portion 81M) moves further upward along the second lower portion 42b2. As a result, the upper frame 41 moves to the guard position (standing position) or a position nearby.

[0075] As described above, even if the front loader 12 is raised with the upper frame 41 in the retracted position (forward leaning posture), as the front loader 12 is raised, a part of the front loader 12 (the connecting portion 81M) comes into contact with the lower curved portion 42b and moves upward from the first lower portion 42b1 along the second lower portion 42b2, causing the upper frame 41 to swing from the retracted position (forward leaning posture) to the guard position (upright posture). This prevents excessive force from acting on the front guard 30, and prevents damage to the front guard 30.

[0076] Another example of an erroneous operation is when the front loader 12 is lowered with the upper frame 41 in the retracted position (forward tilted posture). This case will be described below. 16 shows a state in which the front loader 12 is raised while the upper frame 41 is in the retracted position (forward tilted posture). In this state, a part of the front loader 12 (the connecting portion 81M of the stand 80) is located above the front guard 30 and is not in contact with the front guard 30.

[0077] When the front loader 12 is lowered from the state shown in FIG. 16, a part of the front loader 12 is lowered. It abuts against the curved portion 42a (see FIG. 17). Here, part of the front loader 12 is the stand 80. Specifically, part of the front loader 12 is the connecting portion 81M of the stand 80. More specifically, part of the front loader 12 is the rear portion 81Mb of the connecting portion 81M of the stand 80.

[0078] In other words, the upper curved portion 42a has a portion (hereinafter referred to as the "first upper portion 42a1") that comes into contact with a part of the front loader 12 (the connecting portion 81M) when the front loader 12 is lowered with the upper frame 41 in the retracted position (forward leaning posture). The first upper portion 42a1 is located on the movement trajectory of the part of the front loader 12 (the connecting portion 81M) when the front loader 12 is lowered with the upper frame 41 in the retracted position (forward leaning posture). The first upper portion 42a1 is the portion that comes into contact first with a part of the front loader 12 (the connecting portion 81M of the stand 80) when the front loader 12 is lowered with the upper frame 41 in the retracted position (forward leaning posture).

[0079] 2 and 17, the upper curved portion 42a has a second upper portion 42a2 that curves forward as it extends downward from the first upper portion 42a1. As shown in Fig. 17, the second upper portion 42a2 curves forward as it extends downward from the first upper portion 42a1 when the upper frame 41 is in the retracted position (forward leaning posture). Also, as shown in Fig. 2, the second upper portion 42a2 curves forward as it extends downward from the first upper portion 42a1 when the upper frame 41 is in the guard position (upright posture).

[0080] When the front loader 12 is further lowered from the state shown in FIG. 17, a part of the front loader 12 (the connecting portion 81M) moves downward from the first upper portion 42a1 along the second upper portion 42a2. Accordingly, the upper frame 41 is pushed rearward by a part of the front loader 12 (the connecting portion 81M), and swings from the retracted position (forward leaning position) toward the guard position (standing position) (see FIG. 18). Then, when the front loader 12 is further lowered from the state shown in FIG. 18, a part of the front loader 12 (the connecting portion 81M) moves further downward along the second upper portion 42a2. As a result, the upper frame 41 moves to the guard position (standing position) or a position nearby.

[0081] As described above, even if the front loader 12 is lowered with the upper frame 41 in the retracted position (forward leaning posture), as the front loader 12 is lowered, a part of the front loader 12 (the connecting portion 81M) comes into contact with the upper curved portion 42a and moves downward from the first upper portion 42a1 along the second upper portion 42a2, causing the upper frame 41 to swing from the retracted position (forward leaning posture) to the guard position (upright posture). This prevents excessive force from acting on the front guard 30, and prevents damage to the front guard 30.

[0082] The part of the front loader 12 described above does not necessarily have to be the connecting portion 81M of the stand 80, but may be another part of the stand 80, or may be a part of the front loader 12 other than the stand 80. The part of the front loader 12 described above may be a part that abuts against the upper curved portion 42a when the front loader 12 is lowered with the upper frame 41 in the retracted position (upright posture), and that abuts against the lower curved portion 42b when the front loader 12 is raised with the upper frame 41 in the retracted position (forward tilting posture). Such a part is provided between the left boom 15L and the right boom 15R of the front loader 12.

[0083] The front guard 30 according to the above embodiment provides the following effects. The front guard 30 is a front guard attached to the front of the body 2 of the work vehicle 1, and comprises a lower frame 31 attached to the body 2, and an upper frame 41 attached so as to be swingable relative to the lower frame 31 around an axis in the body width direction, and capable of changing its position between an upright position and a forward-leaning position by swinging relative to the lower frame 31, the upper frame 41 having a left portion 42L pivoted to the left portion of the lower frame 31 and extending upward, a right portion 42R pivoted to the right portion of the lower frame 31 and extending upward, and an upper portion 43 connecting the upper portion of the left portion 42L and the upper portion of the right portion 42R, and the upper portion 43 is provided with a protrusion 44 that protrudes downward.

[0084] According to this configuration, when the hood 25 is opened with the front guard 30 attached to the vehicle body 2 and the upper frame 41 in an upright position (guard position), the hood 25 can be configured to come into contact with the protrusion 44. This allows the front guard 30 to swing from the upright position (guard position) to a forward-leaning position (retracted position) as the hood 25 is opened, thereby preventing damage to the front guard 30. In addition, when an operator changes the upper frame 41 from an upright position to a forward-leaning position, the operator can hold the protrusion 44. This allows the upper frame 41 to be easily changed from an upright position to a forward-leaning position.

[0085] Further, a lower curved portion 42b is formed at the lower portion of the left portion 42L and the lower portion of the right portion 42R, and curves rearward as it extends downward. According to this configuration, when the front loader 12 attached to the front of the work vehicle 1 is lowered, the upper frame 41 is in a forward tilted position (retracted position), and the front loader 12 is then raised in this state, a part of the front loader 12 can be configured to move along the lower curved portion 42b. As a result, the front guard 30 can be swung from the forward tilted position (retracted position) to the upright position (guard position) as the front loader 12 is raised, preventing damage to the front guard 30.

[0086] Furthermore, an upper curved portion 42a that curves rearward as it extends upward is formed at the upper portion of the left portion 42L and the upper portion of the right portion 42R. According to this configuration, when the front loader 12 attached to the front of the work vehicle 1 is raised and the upper frame 41 is in a forward tilted position (retracted position), and the front loader 12 is lowered in this state, a part of the front loader 12 can be configured to move along the upper curved portion 42a. As a result, the front guard 30 can be swung from the forward tilted position (retracted position) to an upright position (guard position) as the front loader 12 is lowered, thereby preventing damage to the front guard 30.

[0087] In addition, an elastic member 46 is provided on the rear surface of the protrusion 44. This configuration can prevent damage to the hood 25 or the protruding portion 44 when the hood 25 hits the protruding portion 44. In addition, the feeling when the worker holds the protruding portion 44 can be made pleasant. The work vehicle 1 is a work vehicle that includes a vehicle body 2, a hood 25 that can be opened and closed using the front part of the vehicle body 2 as a fulcrum, and a front guard 30 that is attached to the vehicle body 2 in front of the hood 25, and the front guard 30 includes a lower frame 31 that is attached to the vehicle body 2, and an upper frame 41 that is attached to the lower frame 31 so as to be swingable about an axis in the vehicle body width direction and that can be changed in position between an upright position and a forward-leaning position by swinging relative to the lower frame 31. The upper frame 41 has a left portion 42L pivoted to the left portion of the lower frame 31 and extending upward, a right portion 42R pivoted to the right portion of the lower frame 31 and extending upward, and an upper portion 43 connecting an upper portion of the left portion 42L and an upper portion of the right portion 42R, and the upper portion 43 is provided with a protrusion 44 that protrudes downward, and the protrusion 44 is positioned to abut against the upper surface of the hood 25 when the hood 25 is opened with the upper frame 41 in an upright position.

[0088] According to this configuration, when the hood 25 is opened with the upper frame 41 of the front guard 30 in the upright position (guard position), the hood 25 abuts against the protrusion 44. As a result, the front guard 30 can be swung from the upright position (guard position) to the forward tilted position (retracted position) in response to the opening of the hood 25. Therefore, damage to the front guard 30 can be prevented.

[0089] Furthermore, when the hood 25 is opened with the front guard 30 in the upright position, the hood 25 comes into contact with the protruding portion 44, causing the upper frame 41 to swing from the upright position to a forward tilted position. According to this configuration, when the hood 25 is opened with the upper frame 41 of the front guard 30 in an upright position (guard position), the front guard 30 swings from the upright position (guard position) to a forward-leaning position (retracted position) as the hood 25 is opened, thereby preventing damage to the front guard 30.

[0090] The work vehicle 1 is a work vehicle that includes a vehicle body 2, a front guard 30 attached to the front of the vehicle body 2, and a front loader 12 that is attached to the front of the vehicle body 2 and can be raised or lowered, the front guard 30 having a lower frame 31 attached to the vehicle body 2, and an upper frame 41 that is attached so as to be swingable relative to the lower frame 31 about an axis in the vehicle body width direction and can change its position between an upright position and a forward-leaning position by swinging relative to the lower frame 31, the upper frame 41 having a vertical portion 42 that extends upward, and an upper curved portion 42a formed at the upper part of the vertical portion 42 that curves rearward as it extends upward, and the upper curved portion 42a has a first upper portion 42a1 that is located on a part of the movement trajectory of the front loader 12 when the front loader 12 is lowered with the upper frame 41 in a forward-leaning position, and a second upper portion 42a2 that curves forward as it extends downward from the first upper portion 42a1.

[0091] According to this configuration, when the front loader 12 attached to the front of the work vehicle 1 is raised, the upper frame 41 is in a forward tilted position (retracted position), and the front loader 12 is lowered in this state, a part of the front loader 12 comes into contact with the first upper portion 42a1 of the upper curved portion 42a, and then moves along the second upper portion 42a2. As a result, the front guard 30 can be swung from the forward tilted position (retracted position) to the upright position (guard position) as the front loader 12 is lowered, thereby preventing damage to the front guard 30.

[0092] The front loader 12 also has a stand 80 that can be placed on the ground when the front loader 12 is lowered, and the first upper portion 42a1 is located on a part of the movement trajectory of the stand 80 when the front loader 12 is lowered with the upper frame 41 in a forward tilted position. According to this configuration, when the front loader 12 is lowered, the stand 80 comes into contact with the first upper portion 42a1 of the upper curved portion 42a and then moves along the second upper portion 42a2. This allows the front guard 30 to swing from the forward tilted position (retracted position) to the upright position (guard position) as the front loader 12 is lowered, thereby preventing damage to the front guard 30.

[0093] The stand 80 also has a left leg 81L, a right leg 81R, and a connecting part 81M that connects the left leg 81L and the right leg 81R, and the first upper part 42a1 is located on the movement trajectory of the connecting part 81M when the front loader 12 is lowered with the upper frame 41 in a forward leaning position. According to this configuration, when the front loader 12 is lowered, the connecting portion 81M of the stand 80 comes into contact with the first upper portion 42a1 of the upper curved portion 42a and then moves along the second upper portion 42a2. This allows the front guard 30 to swing from the forward tilted position (retracted position) to the upright position (guard position) as the front loader 12 is lowered, thereby preventing damage to the front guard 30.

[0094] The upper frame 41 is pivotally supported on the left side of the lower frame 31 and has a left portion 42 extending upward. The vertical portion 42 includes a left portion 42L and a right portion 42R that is pivotally supported on the right portion of the lower frame 31 and extends upward, and the vertical portion 42 includes a left portion 42L and a right portion 42R, and the upper curved portion 42a is formed at the upper portion of the left portion 42L and the upper portion of the right portion 42R. According to this configuration, when the front loader 12 is lowered, a part of the front loader 12 can be brought into contact with the upper curved portions 42a formed on the upper parts of the left section 42L and the right section 42R. Therefore, a part of the front loader 12 can be reliably brought into contact with the upper curved portions 42a.

[0095] Furthermore, when the front loader 12 is lowered with the upper frame 41 in a forward tilted position, a part of the front loader 12 moves downward from the first upper portion 42a1 along the second upper portion 42a2, and the upper frame 41 swings from the forward tilted position to an upright position. According to this configuration, when the front loader 12 is raised, the upper frame 41 is in a forward-leaning position (retracted position), and the front loader 12 is then lowered, a part of the front loader 12 moves downward from the first upper portion 42a1 along the second upper portion 42a2, and the upper frame 41 swings from the forward-leaning position to an upright position, thereby preventing damage to the front guard 30.

[0096] In addition, a lower curved portion 42b is formed at the bottom of the vertical portion 42, curving rearward as it goes downward, and the lower curved portion 42b has a first lower portion 42b1 that is located on part of the movement trajectory of the front loader 12 when the front loader 12 is raised with the upper frame 41 in a forward-leaning position, and a second lower portion 42b2 that curves forward as it goes upward from the first lower portion 42b1.

[0097] According to this configuration, when the front loader 12 is lowered, the upper frame 41 is in a forward tilted position (retracted position), and the front loader 12 is then raised, a part of the front loader 12 can be brought into contact with the first lower portion 42b1 and then moved along the second lower portion 42b2. As a result, the front guard 30 can be swung from the forward tilted position (retracted position) to the upright position (guard position) as the front loader 12 is raised, preventing damage to the front guard 30.

[0098] Furthermore, when the front loader 12 is raised with the upper frame 41 in a forward tilted position, a part of the front loader 12 moves upward along the second lower portion 42b2 from the first lower portion 42b1, and the upper frame 41 swings from the forward tilted position to an upright position. According to this configuration, when the front loader 12 is lowered, the upper frame 41 is in a forward-leaning position (retracted position), and the front loader 12 is then raised, a part of the front loader 12 moves upward from the first lower portion 42b1 along the second lower portion 42b2, and the upper frame 41 swings from the forward-leaning position to an upright position, thereby preventing damage to the front guard 30.

[0099] Further, the protruding portion 44 is provided with an elastic member 46, which is positioned so as to come into contact with the upper surface of the hood 25 when the hood 25 is opened with the upper frame 41 in the upright position. According to this configuration, when the hood 25 hits the protruding portion 44, the hit occurs via the elastic member 46, so that the hood 25 or the protruding portion 44 can be prevented from being damaged.

[0100] Although one embodiment of the present invention has been described above, the embodiment disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0101] 1 Work vehicle 2. Body 12 Front loader 25 Bonnet 30 Front guard 31 Lower Frame 41 Upper Frame 42 Vertical section 42a Upper curved part 42a1 1st upper part 42a2 2nd upper part 42b Lower curved part 42b1 First lower part 42b2 Second lower part 42L left part 42R right part 43 Upper part 44 Protrusion 46 Elastic member 80 Stand 81L left leg 81M connection part 81R Right leg

Claims

1. A front guard attached to the front of a work vehicle body, a lower frame attached to the vehicle body; an upper frame attached to the lower frame so as to be swingable about an axis in the vehicle body width direction, and capable of changing its posture between an upright posture and a forward-leaning posture by swinging relative to the lower frame; Equipped with the upper frame has a left portion pivotally supported on a left portion of the lower frame and extending upward, a right portion pivotally supported on a right portion of the lower frame and extending upward, and an upper portion connecting an upper portion of the left portion and an upper portion of the right portion, The front guard has a protruding portion that protrudes downward at the upper portion.

2. 2. The front guard according to claim 1, wherein a lower curved portion is formed at a lower portion of the left region and a lower portion of the right region, the lower curved portion being curved rearward as it extends downward.

3. 3. The front guard according to claim 1, wherein an upper curved portion is formed at an upper portion of the left region and an upper portion of the right region, the upper curved portion being curved rearward as it extends upward.

4. The front guard according to any one of claims 1 to 3, wherein an elastic member is provided on a rear surface of the protrusion.

5. The car body and a hood that can be opened and closed using the front part of the vehicle body as a fulcrum; a front guard attached to the vehicle body in front of the hood; A work vehicle equipped with The front guard is the front guard according to any one of claims 1 to 4, The protrusion is positioned to come into contact with the upper surface of the hood when the hood is open with the upper frame in the upright position.

6. 6. The work vehicle according to claim 5, wherein when the hood is opened with the front guard in the upright position, the hood abuts against the protrusion, causing the upper frame to swing from the upright position to the forward-leaning position.

7. The protrusion is provided with an elastic member, 7. The work vehicle according to claim 5, wherein the elastic member is positioned so as to come into contact with an upper surface of the hood when the hood is opened with the upper frame in the upright position.

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