Work vehicles

Abstract

To provide a work vehicle that can easily cope with a large item small scale production system.SOLUTION: A work vehicle includes: a front axle case; a support frame to which the front axle case is fixed; a front bumper located in front of the support frame; and a pair of left and right side-frames divided with respect to the support frame and the front bumper and located on both sides in a left-right direction, of the support frame and the front bumper, respectively. The left and right side-frames are connected to the support frame and the front bumper, respectively.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a work vehicle.

Background Art

[0002] In a work vehicle such as a tractor, a front axle case, also called a front axle housing, is supported by a frame. For example, in Patent Document 1, a tractor is disclosed in which the front axle case is supported by bolt fastening to the bottom of the front axle frame. A weight support member is provided on the front wall portion of the front axle case. The weight support member enables attachment and detachment of a balance weight. [[ID=!4]]

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the front axle frame of the tractor of Patent Document 1 is composed of a frame that is an integral body including a front wall portion and a bottom portion. Therefore, for example, when corresponding to a model or specification for mounting a component using front PTO (Power take-off) output, and when corresponding to a model or specification for mounting a front loader or a front dozer, etc., the front axle frame had to be prepared as a completely different structural component. As a result, it was not easy to respond to a mass production system with a small number of varieties that can realize tractors with various specifications in small batch production.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a work vehicle that can easily respond to a mass production system with a small number of varieties.

Means for Solving the Problems

[0006] A work vehicle according to one aspect of the present invention comprises a front axle case, a support frame portion to which the front axle case is fixed, a front bumper portion located in front of the support frame portion, and a pair of left and right side frame portions that are separated from the support frame portion and the front bumper portion and located on both sides in the left-right direction relative to the support frame portion and the front bumper portion, with the left and right side frame portions being connected to the support frame portion and the front bumper portion, respectively. [Effects of the Invention]

[0007] The above configuration makes it easy to accommodate a high-mix, low-volume production system for work vehicles. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view showing a schematic configuration of a tractor, which is an example of a work vehicle according to one embodiment of the present invention. [Figure 2] This is a perspective view of the front interior of the tractor shown above, taken from a diagonal upward angle. [Figure 3] This is a perspective view of the front interior of the tractor shown above, taken from a diagonal downward angle. [Figure 4] This is a magnified perspective view showing the fixing point between the front axle case and the support frame of the tractor shown above. [Figure 5] This is a left side view of the fixed part shown above. [Figure 6] This is a perspective view of the support frame section shown above. [Figure 7] This is a side view showing the work machine frame attached to the first work machine frame fixing part and the second work machine frame fixing part. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below based on the drawings. In this embodiment, a tractor will be used as an example of a work vehicle, but other work vehicles that can be considered include various types of harvesting machines, rice transplanters, combine harvesters, civil engineering and construction equipment, snowplows, and other passenger-type work vehicles.

[0010] Furthermore, in this specification, directions are defined as follows: First, the direction in which the tractor, as a work vehicle, moves during work is defined as "forward," and the opposite direction is defined as "rear." Also, the right side in the direction of the tractor's movement is defined as "right," and the left side is defined as "left." The direction perpendicular to the front-rear and left-right directions of the tractor is defined as the up-down direction. In this case, the direction of gravity is defined as "down," and the opposite side is defined as "up." In the drawings, the forward direction is indicated by F, the rear direction by B, the left direction by L, the right direction by R, the up direction by U, and the down direction by D, as appropriate.

[0011] [1. General configuration of the tractor] Figure 1 is a side view showing the schematic configuration of a tractor 1, which is an example of a work vehicle in this embodiment. The tractor 1 comprises a body 2. The front of the body 2 is supported by a pair of front wheels 3. The rear of the body 2 is supported by a pair of rear wheels 4.

[0012] A hood 5 is positioned at the front of the vehicle body 2. Below the hood 5 is an engine 6, which serves as the power source. The engine 6 is, for example, a diesel engine, but is not limited to this; it may also be a gasoline engine, for example.

[0013] Behind the engine 6 in the vehicle body 2, there is a driver's seat 7 where the driver sits. The driver's seat 7 is equipped with a steering wheel 8 for the driver to steer the vehicle, and the driver's seat 9. The steering wheel 8 is supported by a steering column 10 so as to be able to rotate. The driver's seat 7 is also equipped with control levers LV, pedals P, etc., which are operated by the driver.

[0014] On the rear side of the vehicle body 2, a three-point link mechanism is provided. The three-point link mechanism includes a pair of left and right lower links 11 and an upper link (not shown). The three-point link mechanism can be fitted with a working device. As the working device, for example, a tilling device, a plow, or a fertilizer applicator can be used, but it is not limited thereto. Further, on the rear side of the vehicle body 2, a lifting device (not shown) having a hydraulic device such as a lifting cylinder is provided. By the lifting device lifting the three-point link mechanism, the working device can be lifted and lowered.

[0015] In the vehicle body 2, a ROPS frame 12 is provided at the rear part of the driver's seat 7 (driver's seat 9). The tractor 1 of the present embodiment is of a type in which the driver's seat 9 is not covered by a cab. Therefore, the ROPS frame 12 is provided for the purpose of protecting the driver when the tractor 1 overturns.

[0016] In the vehicle body 2, a transmission case 13 is located behind the engine 6 and below the driver's seat 7. A power transmission device (not shown) is arranged inside the transmission case 13. The rotational power of the engine 6 is transmitted to at least one of the front wheels 3 and the rear wheels 4 via the power transmission device in the transmission case 13.

[0017] [2. Structure near the front axle case of the tractor] FIG. 2 is a perspective view of the front interior of the tractor 1 as seen obliquely from above. FIG. 3 is a perspective view of the front interior of the tractor 1 as seen obliquely from below. The tractor 1 includes a front axle case 21 and a support frame portion 22. The front axle case 21 is a front axle case that houses a front axle (not shown). The front wheels 3 (see FIG. 1) are attached to both the left and right sides of the front axle case 21 via the front axle. The front axle case 21 is fixed to the support frame portion 22. More specifically, it is as follows.

[0018] FIG. 4 is a perspective view showing an enlarged view of a fixed portion between the front axle case 21 and the support frame portion 22. FIG. 5 is a left side view of the fixed portion. The front axle case 21 has a case body 21a, a front fixing portion 21b, and a rear fixing portion 21c. The case body 21a extends in the left - right direction and houses the front axle. The front fixing portion 21b is provided at two locations on the left and right of the front end portion of the case body 21a. The rear fixing portion 21c is provided at two locations on the left and right of the rear end portion of the case body 21a.

[0019] FIG. 6 is a perspective view of the support frame portion 22. The support frame portion 22 has a main body portion 22a, a front support portion 22b, and a rear support portion 22c. The main body portion 22a has a bottom portion 22a1 and side surface portions 22a2. The bottom portion 22a1 is formed in a substantially quadrangular shape when viewed from above. The side surface portions 22a2 extend upward from the front side and the left and right end portions of the bottom portion 22a1. The front support portion 22b extends downward from each of the front - side left and right corners of the bottom portion 22a1 of the main body portion 22a. The rear support portion 22c extends downward from each of the rear - side left and right corners of the bottom portion 22a1 of the main body portion 22a. Note that the above - described shape of the support frame portion 22 is an example, and the support frame portion 22 is not limited to the above - described shape.

[0020] The front fixing portion 21b and the rear fixing portion 21c of the front axle case 21 described above are respectively located below the front support portion 22b and the rear support portion 22c of the support frame portion 22, and are fastened to the front support portion 22b and the rear support portion 22c by bolts B0 (see FIGS. 3 - 5). Thereby, the front axle case 21 is supported and fixed to the support frame portion 22.

[0021] As shown in FIGS. 2 and 3, the tractor 1 includes a front bumper portion 23. The front bumper portion 23 is located in front of the support frame portion 22. As shown in FIG. 1, a balance weight 32 is attached to the front bumper portion 23 via a weight support member 31. The weight support member 31 is fixed to the front bumper portion 23 by, for example, bolts (not shown).

[0022] As shown in Figures 2 to 5, the tractor 1 is equipped with a pair of left and right side frame sections 24. Each side frame section 24 is a separate part that is divided from the support frame section 22 and the front bumper section 23. Each side frame section 24 is located on both sides in the left-right direction relative to the support frame section 22 and the front bumper section 23. Each side frame section 24 extends rearward from a position on the left or right side of the front bumper section 23, and has a shape that bends diagonally downward and then extends further rearward. Note that the above shape of each side frame section 24 is just an example, and each side frame section 24 is not limited to the above shape.

[0023] The left and right side frame sections 24 are connected to the support frame section 22 and the front bumper section 23, respectively. A more detailed explanation of this is as follows.

[0024] Multiple through holes 24a are provided in the left and right side frame sections 24. Each through hole 24a is arranged in the vertical and front-to-back directions within the side frame section 24.

[0025] The bolts B1 are inserted through predetermined through holes 24a in the left and right side frame sections 24, and the bolts B1 are rotated to fix them to the front bumper section 23. In this way, the left and right side frame sections 24 are connected to the front bumper section 23.

[0026] In this embodiment, a through-hole for the bolt B1 is formed at a predetermined position in the front bumper portion 23, and a screw groove that engages with the threads of the bolt B1 is formed on the inner circumferential surface of the through-hole. Therefore, the side frame portion 24 and the front bumper portion 23 are connected by inserting the bolt B1 into the through-hole while rotating it and pressing the side frame portion 24 against the front bumper portion 23 with the head of the bolt B1 (the large-diameter portion connected to the shaft portion on which the threads are formed). Alternatively, a nut that engages with the bolt B1 inserted into the through-hole may be prepared separately, and the side frame portion 24 and the front bumper portion 23 may be connected by engaging the nut with the bolt B1.

[0027] Furthermore, bolts B2 are inserted through predetermined through holes 24a in the left and right side frame sections 24 and fixed to the support frame section 22. In this way, the left and right side frame sections 24 are each connected to the support frame section 22.

[0028] In this embodiment, a recess 22P1 (see Figure 6) is formed at a predetermined position in the support frame portion 22, and a screw groove that engages with the threads of the bolt B2 is formed on the inner circumferential surface of the recess 22P1. Therefore, the side frame portion 24 and the support frame portion 22 are connected by inserting the bolt B2 into the recess 22P1 while rotating it and pressing the side frame portion 24 against the support frame portion 22 with the head of the bolt B2 (the large diameter portion connected to the shaft portion on which the threads are formed).

[0029] As in this embodiment, each side frame section 24 is connected to the support frame section 22 and the front bumper section 23. For example, multiple types of front bumper sections 23 can be prepared, and the user can select the front bumper section 23 according to their application and requirements and connect it to the left and right side frame sections 24 for use. For example, even if a user wants to use a component that utilizes the front PTO output taken from the power of the engine 6, they can select a front bumper section 23 that can accommodate the component and connect it to the left and right side frame sections 24 for use. This allows the same tractor 1 to be used continuously simply by replacing the front bumper section 23. Similarly, if a user wants to use implements such as a front loader or front dozer, the same tractor 1 can be used simply by replacing the front bumper section 23. Therefore, the manufacturer of the tractor 1 does not need to mass-produce tractor 1 with various specifications. In other words, it is possible to easily respond to a multi-product, small-batch production system that can realize tractor 1 with various specifications in small batches.

[0030] Here, for example, if the front bumper section 23 and the support frame section 22 are connected by bolts, when replacing the front bumper section 23, it is necessary not only to release the connection (bolt fastening) between the front bumper section 23 and the side frame section 24, but also to release the connection (bolt fastening) between the front bumper section 23 and the support frame section 22. Also, for example, if the front bumper section 23 and the support frame section 22 are integrally constructed, when replacing the front bumper section 23, it is necessary to release the connection (bolt fastening) between the support frame section 22 and the side frame section 24. From the viewpoint of facilitating the replacement work (installation work and removal work) of the front bumper section 23 with respect to the side frame section 24, it is desirable that the front bumper section 23 is not bolted to the support frame section 22 and is a separate unit. In other words, it is desirable that the front bumper section 23 be located away from the support frame section 22.

[0031] Furthermore, from the viewpoint of facilitating the attachment and detachment of the front bumper section 23 to the left and right side frame sections 24, it is desirable that the front bumper section 23 and the left and right side frame sections 24 be connected by bolts. In other words, it is desirable that the tractor 1 be provided with bolts B1 as first fastening members, which are inserted through the side frame sections 24 and fixed to the front bumper section 23.

[0032] Furthermore, for example, if the front bumper portion 23 and the side frame portion 24 are welded together, welding distortion will occur in the side frame portion 24 due to the heat generated during welding. In this embodiment, as will be described later, the side frame portion 24 is connected to the engine 6. In this configuration, if distortion occurs in the side frame portion 24, a large load or torsional force will be applied to the cylinder block, oil pan, etc. of the engine 6, which may cause cracks or damage to the cylinder block, etc. From the viewpoint of avoiding such problems caused by welding distortion, it is desirable to connect the side frame portion 24 and the front bumper portion 23 with bolts B1.

[0033] Furthermore, from the viewpoint of facilitating the attachment and detachment of the side frame portion 24 to the support frame portion 22, it is desirable that the support frame portion 22 and the left and right side frame portions 24 be connected by bolt fastening. In other words, it is desirable that the tractor 1 be provided with a bolt B2 as a second fastening member, which is inserted through the side frame portion 24 and fixed to the support frame portion 22.

[0034] As shown in Figures 2 to 4, the engine 6 is located behind the support frame 22. The left and right side frame sections 24 are located on either side of the engine 6 in the left-right direction and are connected to the engine 6. More specifically, bolts B3 are inserted through predetermined through holes 24a in the left and right side frame sections 24 and fixed to the side of the engine 6 (e.g., the cylinder block). In this way, the left and right side frame sections 24 are connected to the engine 6.

[0035] In this embodiment, a recess is formed at a predetermined position on the side surface of the engine 6, and a screw groove that engages with the threads of bolt B3 is formed on the inner circumferential surface of the recess. Therefore, the side frame portion 24 and the engine 6 are connected by inserting bolt B3 into the recess while rotating it and pressing the side frame portion 24 against the side surface of the engine 6 with the head of bolt B3 (the large diameter portion connected to the shaft portion on which the threads are formed).

[0036] From the standpoint of facilitating the attachment and detachment of the left and right side frame sections 24 to the engine 6, it is desirable that the left and right side frame sections 24 and the engine 6 be connected by bolt fastening. In other words, it is desirable that the tractor 1 be provided with bolts B3 as a third fastening member, which are inserted through the side frame sections 24 and fixed to the engine 6.

[0037] As shown in Figures 2 to 5, in this embodiment, the tractor 1 further includes a reinforcing frame section 25. The reinforcing frame section 25 is located on the opposite side from the engine 6 to each of the left and right side frame sections 24. The length of the reinforcing frame section 25 in the front-rear direction is shorter than the length of the side frame section 24 in the front-rear direction. The reinforcing frame section 25 is fixed to the outer surface 24S of the side frame section 24 by welding. Because the side frame section 24 is reinforced by the reinforcing frame section 25, the durability of the side frame section 24 is improved. That is, even if some force is applied to the side frame section 24, the risk of damage to the side frame section 24 is reduced.

[0038] The reinforcing frame portion 25 has through holes (not shown) at positions corresponding to the through holes 24a in the side frame portion 24. Bolts B4 are inserted through the through holes in the reinforcing frame portion 25 and the through holes 24a in the side frame portion 24 and fixed to the side of the engine 6 (e.g., cylinder block). As a result, the left and right side frame portions 24 are connected to the engine 6 while being reinforced by the reinforcing frame portion 25.

[0039] From the standpoint of reinforcing the connection between the side frame section 24 and the engine 6, it is desirable that the reinforcing frame section 25 be connected to the engine 6 via the side frame section 24, as described above.

[0040] In this embodiment, a recess is formed at a predetermined position on the side surface of the engine 6, and a screw groove that engages with the threads of bolt B4 is formed on the inner circumferential surface of the recess. Therefore, bolt B4 is inserted into the recess while rotating, and the head of bolt B4 (the large-diameter portion connected to the shaft portion on which the threads are formed) presses the reinforcing frame portion 25 and the side frame portion 24 against the side surface of the engine 6. As a result, the reinforcing frame portion 25 is connected to the engine 6 via the side frame portion 24.

[0041] From the standpoint of facilitating the attachment and detachment of the left and right side frame sections 24 to the engine 6, it is desirable that the reinforcing frame section 25 and the side frame sections 24 be connected to the engine 6 by bolt fastening. In other words, it is desirable that the tractor 1 be provided with a fourth fastening member, which is a bolt B4 inserted through the reinforcing frame section 25 and the side frame sections 24 and fixed to the engine 6.

[0042] Furthermore, from the viewpoint of reinforcing the connection between the side frame portion 24 and the aforementioned support frame portion 22, it is desirable that the reinforcing frame portion 25 be connected to the support frame portion 22 via the side frame portion 24. In this embodiment, the front side of the reinforcing frame portion 25 is connected to the support frame portion 22 via the side frame portion 24, and the rear side is connected to the engine 6 via the side frame portion 24.

[0043] In this embodiment, a recess 22P2 (see Figure 6) is formed at a predetermined position in the support frame portion 22, and a screw groove that engages with the threads of the bolt B5 is formed on the inner circumferential surface of the recess 22P2. Therefore, the bolt B5 is inserted into the recess 22P2 while rotating it, and the head of the bolt B5 (the large-diameter portion connected to the shaft portion on which the threads are formed) presses the reinforcing frame portion 25 and the side frame portion 24 against the support frame portion 22. As a result, the reinforcing frame portion 25 is connected to the support frame portion 22 via the side frame portion 24.

[0044] From the viewpoint of facilitating the attachment and detachment of the left and right side frame sections 24 to the support frame section 22, it is desirable that the reinforcing frame section 25 and the side frame sections 24 and the support frame section 22 are connected by bolts. In other words, it is desirable that the tractor 1 be provided with bolts B5 as a fifth fastening member, which are inserted through the reinforcing frame section 25 and the side frame sections 24 and fixed to the support frame section 22.

[0045] As shown in Figures 2 to 5, the tractor 1 of this embodiment is further equipped with a swing stopper portion 26. The swing stopper portion 26 is a member that restricts the swing of the front axle case 21 around its axis in the front-rear direction. As shown in Figure 5, the swing stopper portion 26 is approximately pentagonal in shape when viewed from the left-right direction, and its lower end portion 26a is located above the case body 21a of the front axle case 21. When the tractor 1 is running, the front axle case 21 swings around the axis, and if the swing angle (rotation angle around the axis) attempts to exceed a predetermined angle, the upper part of the case body 21a hits the lower end portion 26a of the swing stopper portion 26, restricting further swinging. As a result, even if the front axle case 21 swings, it will not hit the side frame portion 24. Therefore, damage to the side frame portion 24 due to the swing of the front axle case 21 is avoided.

[0046] To improve the maintainability of the swing stopper section 26, such as by facilitating its replacement, it is desirable that the swing stopper section 26 be attached to the side frame section 24. In other words, it is desirable that the swing stopper section 26 be connected to each of the left and right side frame sections 24.

[0047] In this case, for example, if the swing stopper portion 26 is connected to the lower ends of the left and right side frame portions 24, the front axle case 21 will be located directly below it, which may make it difficult to replace the swing stopper portion 26. From the viewpoint of ensuring that the replacement of the swing stopper portion 26 is easy, it is desirable that the swing stopper portion 26 be connected to the outer surfaces 24S of the left and right side frame portions 24, respectively.

[0048] In this embodiment, a recess 22P3 (see Figure 6) is formed at a predetermined position in the support frame portion 22, and a screw groove that engages with the threads of the bolt B6 is formed on the inner circumferential surface of the recess 22P3. In addition, an insertion hole (not shown) is formed in the swing stopper portion 26 through which the bolt B6 is inserted. Therefore, the bolt B6 is inserted through the insertion hole in the swing stopper portion 26 and the predetermined through hole 24a in the side frame portion 24, and while rotating the bolt B6, it is inserted into the recess 22P3, and the head of the bolt B5 (the large diameter portion connected to the shaft portion on which the threads are formed) presses the swing stopper portion 26 and the side frame portion 24 against the support frame portion 22. As a result, the swing stopper portion 26 is connected to the side frame portion 24, and at the same time, the side frame portion 24 is fixed to the support frame portion 22.

[0049] From the viewpoint of facilitating the attachment and detachment of the swing stopper portion 26 to the side frame portion 24, it is desirable that the swing stopper portion 26 be bolted to the side frame portion 24 and the support frame portion 22, as described above. In other words, it is desirable that the tractor 1 be provided with a sixth fastening member, which is a bolt B6 inserted through the swing stopper portion 26 and the side frame portion 24 and fixed to the support frame portion 22.

[0050] As shown in Figure 5, the swing stopper portion 26 has a first workpiece frame fixing portion 26P. The first workpiece frame fixing portion 26P is positioned to protrude from the flat plate portion 26Q of the swing stopper portion 26 on the side opposite to the side that contacts the side frame portion 24. The first workpiece frame fixing portion 26P has two through holes 26P1 arranged vertically, through which a bolt B7 (see Figure 7) is inserted. A screw groove that engages with the threads of the bolt B7 is formed on the inner circumferential surface of the through hole 26P1. Note that it is sufficient for at least one through hole 26P1 to be formed in the first workpiece frame fixing portion 26P.

[0051] Furthermore, the reinforcing frame section 25 described above has a second work machine frame fixing section 25P. The second work machine frame fixing section 25P is fixed to the outer surface 25S of the reinforcing frame section 25 by welding or the like. The second work machine frame fixing section 25P has multiple through holes 25P1 through which bolts B8 (see Figure 7) are inserted. The inner circumferential surface of the through holes 25P1 has screw grooves that engage with the threads of the bolts B8. Note that it is sufficient to have at least one through hole 25P1 in the second work machine frame fixing section 25P. Also, although two second work machine frame fixing sections 25P are provided on the reinforcing frame section 25 in Figure 5, it is sufficient to have at least one.

[0052] Figure 7 is a side view showing the work machine frame F attached to the first work machine frame fixing part 26P and the second work machine frame fixing part 25P. Examples of work machines having the work machine frame F include front loaders and front dozers. Bolts B7 are inserted into through holes provided at predetermined positions on the work machine frame F and through holes 26P1 in the first work machine frame fixing part 26P, and then rotated. Bolts B8 are also inserted into through holes provided at predetermined positions on the work machine frame F and through holes 25P1 in the second work machine frame fixing part 25P, and then rotated. As a result, the work machine frame F is fixed to the swing stopper part 26 and the reinforcing frame part 25. Therefore, the work machine frame F is fixed to the side frame part 24 via the swing stopper part 26 and the reinforcing frame part 25.

[0053] From the viewpoint of effectively utilizing the swing stopper portion 26 and the reinforcing frame portion 25 as a base for fixing the work machine frame F, it is desirable, as in this embodiment, that the swing stopper portion 26 has a first work machine frame fixing portion 26P and the reinforcing frame portion 25 has a second work machine frame fixing portion 25P.

[0054] [3. Supplement] Multiple types of support frame sections 22 and side frame sections 24 may be provided, and the desired support frame section 22 and side frame section 24 may be selected as appropriate and connected by bolts. In this case, it is possible to easily accommodate variations in the specifications of the tractor 1, such as the type of front axle case 21, the length of the wheelbase, and the type of engine 6.

[0055] Alternatively, an axle spacer may be placed between the support frame portion 22 and the side frame portion 24, and the support frame portion 22 and the side frame portion 24 may be bolted together via the axle spacer.

[0056] Alternatively, a frame spacer may be placed between the engine 6 and the side frame section 24, and the engine 6 and the side frame section 24 may be bolted together via the frame spacer. Alternatively, the frame spacer may be bolted directly to the engine 6, and the side frame section 24 may be bolted to the frame spacer. In this case, the bolt pitch for fastening the side frame section 24 can be made relatively long, thus increasing the bolt fastening force (making the bolts less likely to loosen).

[0057] The engine 6 and the transmission case 13 (see Figure 1) may also be connected by the frame spacer described above. The connection point between the engine 6 and the transmission case 13 has a significantly changing cross-sectional shape, making it prone to stress concentration. The frame spacer reinforces the area prone to stress concentration, thereby improving the overall rigidity of the tractor 1's frame.

[0058] [4. Addendum] The tractor 1 described in this embodiment can be represented as the following work vehicle.

[0059] (1) Front axle case and The support frame portion to which the aforementioned front axle case is fixed, A front bumper section located in front of the aforementioned support frame section, The support frame portion and the front bumper portion are separated, and the system comprises a pair of left and right side frame portions located on both sides in the left-right direction relative to the support frame portion and the front bumper portion, A work vehicle in which the left and right side frame sections are connected to the support frame section and the front bumper section, respectively.

[0060] (2) The work vehicle as described in (1), wherein the front bumper portion is located separately from the support frame portion.

[0061] (3) The work vehicle according to (1) or (2), further comprising a first fastening member inserted through the side frame portion and fixed to the front bumper portion.

[0062] (4) The work vehicle according to any one of (1) to (3), further comprising a second fastening member inserted through the side frame portion and fixed to the support frame portion.

[0063] (5) The engine is further located behind the support frame section, The work vehicle according to any one of (1) to (4), wherein the left and right side frame sections are each located on both sides in the left-right direction relative to the engine and connected to the engine.

[0064] (6) The work vehicle according to (5), further comprising a third fastening member inserted through the side frame portion and fixed to the engine.

[0065] (7) Each of the left and right side frame sections is further provided with a reinforcing frame section located on the opposite side from the engine, The work vehicle according to (5) or (6), wherein the reinforcing frame portion is connected to the engine via the side frame portion.

[0066] (8) The work vehicle according to (7), further comprising a fourth fastening member inserted through the reinforcing frame portion and the side frame portion and fixed to the engine.

[0067] (9) The work vehicle according to (7) or (8), wherein the reinforcing frame portion is connected to the support frame portion via the side frame portion.

[0068] (10) The work vehicle according to (9), further comprising a fifth fastening member inserted through the reinforcing frame portion and the side frame portion and fixed to the support frame portion.

[0069] (11) Further comprising a swing stopper portion that restricts the swing of the front axle case, The swing stopper portion is connected to each of the left and right side frame portions, in the work vehicle according to any one of (7) to (10).

[0070] (12) The work vehicle as described in (11), wherein the swing stopper portion is connected to the outer surfaces of the left and right side frame portions, respectively.

[0071] (13) The work vehicle according to (12), further comprising a sixth fastening member inserted through the swing stopper portion and the side frame portion and fixed to the support frame portion.

[0072] (14) The work vehicle according to (12) or (13), wherein the swing stopper portion has a first work machine frame fixing portion.

[0073] (15) The work vehicle according to (14), wherein the reinforcing frame portion has a second work machine frame fixing portion.

[0074] Although embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and it can be expanded or modified without departing from the spirit of the invention. [Industrial applicability]

[0075] This invention can be used, for example, in work vehicles such as tractors. [Explanation of Symbols]

[0076] 1. Tractor (work vehicle) 6 engines 21 Front Axle Case 22 Support frame section 23 Front bumper section 24 Side frame section 24S1 External surface 25 Reinforcement frame section 25P Second work machine frame fixing part 26 Swing stopper section 26P First work machine frame fixing part B1 Bolt (First fastening member) B2 Bolt (Second fastening member) B3 Bolt (Third fastening member) B4 Bolt (4th fastening member) B5 Bolt (5th fastening member) B6 Bolt (6th fastening member)

Claims

1. Front axle case and The support frame portion to which the aforementioned front axle case is fixed, A front bumper section located in front of the aforementioned support frame section, The support frame portion and the front bumper portion are separated, and a pair of left and right side frame portions are located on both sides in the left-right direction relative to the support frame portion and the front bumper portion, The engine is located behind the aforementioned support frame section, With respect to each of the left and right side frame sections, a reinforcing frame section located on the opposite side from the engine, A fifth fastening member is inserted through the reinforcing frame portion and the side frame portion and fixed to the support frame portion, Equipped with, The left and right side frame sections are connected to the support frame section and the front bumper section, respectively. The left and right side frame sections are each located on both sides of the engine in the left-right direction and connected to the engine. The reinforcing frame section is connected to the engine via the side frame section. A work vehicle in which the reinforcing frame portion is connected to the support frame portion via the side frame portion.

2. Front axle case and The support frame portion to which the aforementioned front axle case is fixed, A front bumper section located in front of the aforementioned support frame section, The support frame portion and the front bumper portion are separated, and a pair of left and right side frame portions are located on both sides in the left-right direction relative to the support frame portion and the front bumper portion, A swing stopper portion that restricts the swing of the front axle case, Equipped with, The left and right side frame sections are connected to the support frame section and the front bumper section, respectively. The swing stopper portion is connected to the outer surfaces of the left and right side frame portions, Work vehicle.

3. The work vehicle according to claim 1 or 2, wherein the front bumper portion is located separately from the support frame portion.

4. The work vehicle according to claim 1 or 2, further comprising a first fastening member inserted through the side frame portion and fixed to the front bumper portion.

5. The work vehicle according to claim 1 or 2, further comprising a second fastening member inserted through the side frame portion and fixed to the support frame portion.

6. The engine is further located behind the aforementioned support frame section, The work vehicle according to claim 2, wherein the left and right side frame portions are each located on both sides in the left-right direction relative to the engine and are connected to the engine.

7. The work vehicle according to claim 1 or 6, further comprising a third fastening member inserted through the side frame portion and fixed to the engine.

8. Each of the left and right side frame sections is further provided with a reinforcing frame section located on the opposite side from the engine. The work vehicle according to claim 6, wherein the reinforcing frame portion is connected to the engine via the side frame portion.

9. The work vehicle according to claim 8, further comprising a fourth fastening member inserted through the reinforcing frame portion and the side frame portion and fixed to the engine.

10. The work vehicle according to claim 2, further comprising a sixth fastening member inserted through the swing stopper portion and the side frame portion and fixed to the support frame portion.

11. The work vehicle according to claim 2 or 10, wherein the swing stopper portion has a first work machine frame fixing portion.

12. The work vehicle according to claim 11, wherein the reinforcing frame portion has a second work machine frame fixing portion.

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