Work vehicles

Abstract

To provide a work vehicle which enables easy attachment / detachment of a safety frame and achieves a low price.SOLUTION: A work vehicle according to an embodiment includes: left and right rear axle cases; a safety frame which is attached to upper parts of the left and right rear axle cases and erected rearward of a driver seat and has an arch shape in a front view of a machine body; and a rear side floor mount bracket which supports a rear part of a floor step at left and right parts of the machine body from below. The rear side floor mount bracket supports the floor step at positions different from attachment positions of the safety frame to the left and right rear axle cases.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, some work vehicles such as agricultural tractors are equipped with an arch-shaped safety frame (also called a ROPS) that is erected behind the driver's seat and is viewed from the front of the vehicle to ensure the safety of the driver in the event of the vehicle tipping over, etc. The safety frame is attached to a heavy part such as a rear wheel axle (for example, a rear axle case) with a connector such as a bolt (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-322723 A Summary of the Invention [Problem to be solved by the invention]

[0004] In work vehicles, the mounting portion of the rear floor mount bracket, which supports the floor step from below, is sometimes attached together with the safety frame at the mounting position of the safety frame because it is desired to attach the safety frame to a heavy part such as the rear axle case.

[0005] In addition, since work vehicles need to be packaged for transportation, the safety frame may have a split structure at the height of the rear fender so that it does not protrude upward from the vehicle body (e.g., the rear fender).

[0006] However, in conventional work vehicles, when the vehicle is packed, the mounting portion of the rear floor mounting bracket is also attached to the mounting position of the safety frame, making it difficult to remove the safety frame and expensive to make the safety frame into a split structure.

[0007] The present invention has been made in view of the above, and has an object to provide a work vehicle in which a safety frame can be easily attached and detached, and which is inexpensive. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems and achieve the objective, the work vehicle (1) according to the embodiment comprises left and right rear axle cases (26), a safety frame (30) that is attached to the upper part of each of the left and right rear axle cases (26) and that is arch-shaped when viewed from the front of the vehicle and stands behind the driver's seat (241), and rear floor mount brackets (40) that support the rear parts of floor steps (23) from below on the left and right sides of the vehicle, and the rear floor mount brackets (40) support the floor step (23) at a position (P2) different from the mounting position (P1) of the safety frame (30) relative to the left and right rear axle cases (26). Effect of the Invention

[0009] According to the work vehicle according to the embodiment, the safety frame can be easily attached and detached at low cost. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing a support structure for a rear portion of a floor step and a safety frame in a work vehicle according to an embodiment. [Diagram 2] FIG. 2 is an enlarged view of part A in FIG. [Diagram 3]FIG. 3 is an enlarged perspective view showing a state in which the floor step is supported by the rear floor mount bracket. [Figure 4A] FIG. 4A is a perspective view showing a rear floor mount bracket. [Figure 4B] FIG. 4B is a rear view showing the rear floor mount bracket. [Figure 5A] FIG. 5A is a diagram (part 1) showing the positional relationship between the rear floor mount bracket and each part. [Figure 5B] FIG. 5B is a diagram (part 2) showing the positional relationship between the rear floor mount bracket and each part. [Figure 5C] FIG. 5C is a diagram (part 3) showing the positional relationship between the rear floor mount bracket and each part. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a work vehicle disclosed in the present application will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiment described below.

[0012] <Overview of Work Vehicles (Tractors)> An overview of a work vehicle 1 according to an embodiment will be described with reference to Figures 1 and 2. Figure 1 is a perspective view showing the support structure of a rear portion of a floor step 23 and a safety frame 30 in a work vehicle (tractor) 1 according to an embodiment. Figure 2 is an enlarged view of part A in Figure 1.

[0013] 1 and 2, a three-dimensional Cartesian coordinate system including a Z-axis with the positive direction being the vertically upward (upward) direction is shown. In the following, for convenience of explanation, the positive direction of the X-axis is defined as the left, the negative direction of the X-axis as the right, the positive direction of the Y-axis as the forward direction, and the negative direction of the Y-axis as the backward direction, and the X-axis direction may be referred to as the left-right direction, the Y-axis direction as the front-back direction, and the Z-axis direction as the up-down direction.

[0014] A work vehicle 1 according to the embodiment is, for example, an agricultural tractor (hereinafter, referred to as a tractor) that works in a field, and as shown in Fig. 1, is equipped with a traveling body 2 and a working machine (not shown). The traveling body 2 is capable of traveling in a field, and is equipped with, for example, a pair of left and right front wheels (not shown) and a pair of left and right rear wheels (not shown) as a traveling device. In this case, the front wheels are, for example, steering wheels, and the rear wheels are, for example, drive wheels. Note that hereinafter, the tractor 1 and the traveling body 2 may be referred to as "machine body".

[0015] The rear wheels are configured so that the power generated by an engine (not shown) mounted inside a bonnet (not shown) constituting the front part of the traveling body 2 can be transmitted, for example, at an appropriate reduced speed by a main transmission and an auxiliary transmission (neither of which are shown). In other words, the rear wheels are driven by the power transmitted from the engine.

[0016] The tractor 1 may be configured so that the power generated by the engine and reduced in speed by the main transmission and the sub transmission is also transmitted to the front wheels via a front wheel speed increasing switching mechanism (not shown) to drive four wheels, that is, the left and right front wheels and the left and right rear wheels. The tractor 1 may also be configured so that it is switchable between two-wheel drive and four-wheel drive.

[0017] A PTO (Power Take-Off) shaft 21 to which a working implement can be attached is disposed at the rear of the tractor 1. The working implement of the tractor 1 may be a rotary tiller that is attached to the rear of the traveling body 2. The rotary tiller has tilling tines that rotate by receiving power from the PTO shaft 21, and tills the soil with the tilling tines.

[0018] The traveling body 2 also includes a main cylinder (not shown) disposed at the rear thereof for applying a driving force for raising and lowering the work machine. The main cylinder is connected to a lift arm (not shown) and applies a hydraulic driving force to the lift arm. The main cylinder is a hydraulic cylinder and includes a cylinder case and a rod. The main cylinder drives the rod by supplying or discharging hydraulic oil.

[0019] When hydraulic oil is supplied to the main cylinder, the main cylinder drives the lift arm via the rod to raise the work equipment, and when hydraulic oil is discharged from the main cylinder, the main cylinder drives the lift arm via the rod to lower the work equipment.

[0020] As shown in Fig. 1, the traveling body 2 includes a main frame 22, a floor step 23, and a steering section 24. The main frame 22 is a body frame of the traveling body 2. The floor step 23 covers the front-to-rear width from the front beam frame to the rear beam frame of the main frame 22 and the left-to-right width of the left and right front connecting frames and the rear connecting frame, and forms a portion on which an operator (also called an operator) boards. Some floor steps 23 are integrally formed to improve strength and reduce the number of parts, while others are configured to be separable into front-to-rear and left-to-right sections for easy attachment and detachment.

[0021] The floor step 23 has its front (front side) and rear (rear side) supported from below on the main frame 22. For this reason, the traveling vehicle body 2 is provided with a front side floor mount bracket (not shown) and a rear side floor mount bracket 40 having mount portions for supporting the floor step 23. Of these, the rear side floor mount bracket 40 will be described in detail later with reference to FIG. 3 and subsequent figures.

[0022] The control section 24 is disposed above the floor step 23. The control section 24 is equipped with a cockpit 241, a steering wheel (not shown), and various other operating devices (gear shift lever 242, position lever 243, clutch pedal, brake pedal, accelerator pedal, etc.). The cockpit 241 is a seat where the pilot of the aircraft sits. The steering wheel is an operating device for steering the front wheels. A meter panel and the like are disposed in front of the steering wheel.

[0023] In addition, the speed change lever 242 is an operating tool that is operated when changing the speed of the traveling body 2, and the position lever 243 is an operating tool that is operated when raising and lowering the work equipment, and is an operating tool that is operated when raising and lowering the work equipment while adjusting the lifting and lowering speed of the work equipment.

[0024] Furthermore, the tractor 1 is a type that does not have a cabin that covers the control section 24, and therefore has a safety frame 30 as shown in Figures 1 and 2. The safety frame 30 is a member provided to ensure the safety of the operator, and is erected behind the operator's seat 241 and is an arch-shaped member when viewed from the front of the machine body (when the machine body is viewed from the front).

[0025] The safety frame 30 includes a lower frame 31, an upper frame 32, and a connecting portion 33. The lower frames 31 are a pair of left and right frames, and are attached to the left and right sides of the rear transmission case 25, respectively, on the upper portions of the left and right rear axle cases 26 that are provided integrally with the rear transmission case 25. The upper frame 32 is provided so as to be suspended between the upper ends of the left and right lower frames 31.

[0026] The connecting portions 33 are disposed between the left and right lower frames 31 and the upper frames 32, and connect the left and right lower frames 31 and the upper frames 32 together. The connecting portions 33 connect the left and right lower frames 31 together so that the upper frame 32 is rotatable relative to the left and right lower frames 31. The upper frame 32 is connected to the left and right lower frames 31 by the connecting portions 33 so that it can tilt rearward relative to the left and right lower frames 31. A damper (not shown) is provided on the connecting portions 33. The damper is, for example, of a gas spring type, and includes a cylinder and a rod inserted into the cylinder, and is configured to be extendable and contractible.

[0027] In this manner, the safety frame 30 allows the upper frame 32 to change its position from an upright position to a reclined position (storage position).

[0028] The left and right lower frames 31 are attached to the left and right rear axle cases 26 by support members 311 interposed between the left and right lower frames 31 and the rear axle case 26 and connectors 312 such as bolts. The left and right lower frames 31 can be removed from the left and right rear axle cases 26 by removing the connectors 312.

[0029] In the tractor 1, the attachment position P1 of the safety frame 30 to the left and right rear axle cases 26 and the position (support position) P2 where the rear floor mount bracket 40 supports the floor step 23 are disposed to be different.

[0030] <Rear floor mount bracket> Next, the rear floor mount bracket 40 will be described with reference to Figures 3, 4A, and 4B. Figure 3 is an enlarged perspective view showing the state in which the rear floor mount bracket 40 supports the floor step 23. Figure 4A is a perspective view showing the rear floor mount bracket 40. Figure 4B is a rear view showing the rear floor mount bracket 40.

[0031] As shown in FIG. 3, the rear floor mount bracket 40 supports the floor step 23 (see FIG. 1) from below via a mount member (e.g., a rubber mount with vibration isolation function) 44 disposed on a mount portion 43 described later, which is positioned on both the left and right sides of the aircraft.

[0032] 4A and 4B, the rear floor mount bracket 40 includes a bracket fixing portion 41, a stay portion 42, and a mount portion 43. The bracket fixing portion 41 is attached to the upper portion (the upper surface of the cylinder case) of the main cylinder that raises and lowers the working machine and is disposed at the rear of the traveling body 2 (see FIG. 1).

[0033] The bracket fixing portion 41 includes a top plate 411, a bottom plate 412, and side plate portions 413. The top plate 411 is a horizontally long plate-like member, that is, a plate-like member that is long in the left-right direction when the rear floor mount bracket 40 is installed. The bottom plate 412 is a horizontally long plate-like member, that is, a plate-like member that is long in the left-right direction when the rear floor mount bracket 40 is installed. The bottom plate 412 has multiple (three) fixing holes 412a for fixing the rear floor mount bracket 40 to the upper surface of the cylinder case when it is installed.

[0034] The rear floor mount bracket 40 is fixed to the upper surface of the cylinder case with fasteners such as bolts via fixing holes 412a in the bottom plate 412. Of the three fixing holes 412a, for example, two are arranged side by side in the left-right direction at the rear edge of the bottom plate 412, and one is arranged at the front edge of the bottom plate 412. The fixing hole 412a arranged at the front edge of the bottom plate 412 is offset, for example, to the right.

[0035] The side plate portion 413 is a plate-like member formed in a U-shape, and is disposed on each of the left and right sides of the top plate 411 and the bottom plate 412. The side plate portion 413 is disposed on each of the left and right sides of the top plate 411 and the bottom plate 412, so that two side plates 413a are arranged side by side at a predetermined interval. The side plate portion 413 connects the top plate 411 and the bottom plate 412.

[0036] Moreover, the bracket fixing portion 41 has an internal space S formed by the top plate 411, the bottom plate 412, and the inner side plate 413a so as to penetrate in the front-rear direction when the rear floor mount bracket 40 is installed. As shown in Fig. 3, a hydraulic hose 51 that forms an oil passage in the hydraulic system of the aircraft is inserted into the internal space S when the rear floor mount bracket 40 is installed. In addition, various sub-computer hoses and the like are inserted into the internal space S for routing when the rear floor mount bracket 40 is installed.

[0037] 4A and 4B, the bracket fixing portion 41 includes a holder member 414 for holding the stay portion 42 described later. The holder member 414 is a plate-like member formed in a U-shape, and is disposed on both the left and right sides.

[0038] The left and right stay portions 42 are a pair, and extend to the left and right sides from the left and right side portions of the bracket fixing portion 41, respectively. The left and right stay portions 42 are pipe-shaped members. The left and right stay portions 42 have base ends 421 fixed by the side plate portions 413 of the bracket fixing portion 41, and are inclined downward from the bracket fixing portion 41 to the tip ends 422. The left and right stay portions 42 are formed so as to be in an eight-shape when viewed from the rear of the vehicle with the rear floor mount bracket 40 installed. The left and right stay portions 42 are also formed so as to be in an eight-shape when viewed from above the vehicle with the rear floor mount bracket 40 installed.

[0039] The base ends 421 of the left and right stay parts 42 are inserted into insertion holes 413b formed in the side plates 413a of the bracket fixing part 41, sandwiched between the side plates 413a, and further sandwiched and held by the holder members 414, and then fixed to the bracket fixing part 41 by welding or the like. Also, by arranging the U-shaped side plate parts 413 of the bracket fixing part 41 in the opposite directions so that the openings on the left and right are reversed, and welding or the like, it is possible to ensure clearance with surrounding parts.

[0040] The mount portion 43 is a plate-like member formed in an L-shape, and is provided at the tip portions 422 of the left and right stay portions 42. The mount portion 43 is fixed to the left and right stay portions 42 by welding or the like. The mount portion 43 has mounting holes 43a to which the above-mentioned mounting members 44 (see FIG. 3), such as a rubber mount, are attached. The mount portion 43 supports the floor step 23 (see FIG. 1) from below via the mounting members 44.

[0041] As described above, the support position P2 (see FIG. 1) of the floor step 23 by the mount portion 43 is a position different from the attachment position P1 (see FIG. 1) of the safety frame 30, and specifically, is disposed above and in front of the attachment position P1 of the safety frame 30. The attachment position P1 of the safety frame 30 is disposed below the support position P2 of the floor step 23 and behind the support position P2 of the floor step 23.

[0042] In this way, since the mounting position P1 of the safety frame 30 and the support position P2 of the floor step 23 are separate positions, it is possible to mount or remove only the safety frame 30 to or from the rear axle case 26. This allows the safety frame 30 to be easily mounted or removed.

[0043] Furthermore, when transporting the tractor 1 (see FIG. 1), the tractor 1 needs to be packed, but for example, packing is difficult if the safety frame 30 protrudes above the rear fender 27 of the traveling body 2. For this reason, the safety frame 30 is sometimes made to have a split structure at the height of the rear fender 27 (see FIG. 1), but because the safety frame 30 can be easily removed from the mounting position P1 of the rear axle case 26, such a split structure is not necessary, making the product less expensive.

[0044] Furthermore, since the attachment position P1 of the safety frame 30 is located lower than the mount portion 43, the attachment and removal of the safety frame 30 can be performed at a low position, making the attachment and removal of the safety frame 30 easier.

[0045] In addition, since the safety frame 30 is supported lower on the traveling vehicle body 2 (see FIG. 1), the center of gravity of the vehicle body is lowered, and deterioration of the vehicle body balance performance can be suppressed.

[0046] In addition, since the left and right stay portions 42 are each inclined downward toward the tip portion 422, the mount portion 43 can be positioned further downward, and the floor step 23 can be positioned further downward.

[0047] In addition, since the bracket fixing portion 41 has an internal space S, by inserting the hydraulic hose 51, etc. into the internal space S, multiple hydraulic hoses 51, various sub-control hoses, etc. can be bundled together, and the hydraulic hoses 51, various sub-control hoses, etc. can be easily arranged.

[0048] Furthermore, since the left and right stay portions 42 are pipe-shaped members, the vibrations of the floor step 23 can be absorbed by the left and right stay portions 42 as well as the mount member 44 .

[0049] <Rear floor mount bracket and relative positions of each component> Next, the positional relationship between the rear floor mount bracket 40 and each part will be described with reference to Figures 5A, 5B, and 5C. Figures 5A to 5C are diagrams (perspective views) showing the positional relationship between the rear floor mount bracket 40 and each part.

[0050] 5A , when the rear floor mount bracket 40 is installed, as described above, the hydraulic hose 51 and various sub-computer hoses are inserted into the internal space S of the bracket fixing portion 41. In addition, the left and right stay portions 42 (left stay portion 42L, right stay portion 42R) pass above the rear axle case 26. In addition, the left and right stay portions 42 (left stay portion 42L, right stay portion 42R) pass in front of the lower frame 31 of the safety frame 30.

[0051] Also, as shown in FIG. 5B, when the rear floor mount bracket 40 is installed, of the left and right stay portions 42, the left stay portion 42L passes behind the change bracket 52 that supports a link connected to the gear shift lever (also called the change lever) 242 (see FIG. 1) in a manner that enables power transmission.

[0052] 5C, when the rear floor mount bracket 40 is installed, of the left and right stay portions 42, the right stay portion 42R passes above a position link 53 that is connected to the position lever 243 (see FIG. 1) so as to be capable of transmitting power. The right stay portion 42R also passes above a draft link 54 for towing a work machine. Furthermore, the right stay portion 42R passes between the position link 53 and the draft link 54. The draft link 54 is disposed below the holder member 414 of the bracket fixing portion 41 so as to be protected by the holder member 414.

[0053] In addition, when the rear floor mount bracket 40 is installed, the left and right stay portions 42 (left stay portion 42L, right stay portion 42R) are positioned diagonally forward of a lift arm (not shown) that raises and lowers the work equipment in the tractor 1 (see Figure 1).

[0054] According to the embodiment described above, the following work vehicle (tractor) 1 is realized.

[0055] (1) A work vehicle (tractor) 1 comprising left and right rear axle cases 26, a safety frame 30 that is attached to the upper parts of the left and right rear axle cases 26 and that is arch-shaped when viewed from the front of the vehicle and stands behind a cockpit 241, and a rear floor mount bracket 40 that supports the rear of a floor step 23 from below on each of the left and right sides of the vehicle, the rear floor mount bracket 40 supporting the floor step 23 at a position (support position P2) different from the mounting position P1 of the safety frame 30 relative to the left and right rear axle cases 26.

[0056] According to such a work vehicle (tractor) 1, the mounting position P1 of the safety frame 30 and the position (support position) P2 for supporting the floor step 23 are separate positions, so that only the safety frame 30 can be mounted or removed from the rear axle case 26. This allows the safety frame 30 to be easily mounted or removed.

[0057] Furthermore, when transporting the work vehicle (tractor) 1, it is necessary to pack this work vehicle (tractor) 1, but for example, packing is difficult if the safety frame 30 protrudes above the rear fender 27 of the traveling body 2. For this reason, the safety frame 30 may have a split structure at the height of the rear fender 27, but because the safety frame 30 can be easily removed from the mounting position P1 on the rear axle case 26, such a split structure is unnecessary, making it less expensive.

[0058] (2) In the above (1), the rear floor mount bracket 40 has a bracket fixing portion 41, left and right stay portions 42 extending laterally to the left and right from the bracket fixing portion 41, and a mount portion 43 provided at the tip of each of the left and right stay portions 42 and supporting the floor step 23, and the attachment position P1 of the safety frame 30 relative to the rear axle case 26 is positioned below the mount portion 43, in the work vehicle (tractor) 1.

[0059] According to such a work vehicle (tractor) 1, the mounting position P1 of the safety frame 30 relative to the rear axle case 26 is located lower than the mount portion 43, so that the work of mounting and removing the safety frame 30 can be performed at a low position, making the work of mounting and removing the safety frame 30 easier.

[0060] In addition, since the safety frame 30 is supported lower on the traveling vehicle body 2, the center of gravity of the vehicle is lowered, and deterioration of the vehicle balance performance can be suppressed.

[0061] (3) In the work vehicle (tractor) 1 described above in (2), the left and right stay portions 42 are each inclined downward as they extend from the bracket fixing portion 41 toward the tip portion.

[0062] According to such a work vehicle (tractor) 1, the mount portion 43 can be disposed further downward, and the floor step 23 can be disposed further downward.

[0063] (4) In the work vehicle (tractor) 1 described above in (2) or (3), the bracket fixing portion 41 has an internal space S penetrating in the fore-and-aft direction, and a hydraulic hose 51 forming an oil passage in the hydraulic system of the machine body is inserted into the internal space S.

[0064] According to such a work vehicle (tractor) 1, by inserting the hydraulic hoses 51 into the internal space S of the bracket fixing portion 41, multiple hydraulic hoses 51 can be bundled together and the hydraulic hoses 51 can be easily arranged.

[0065] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof. [Explanation of symbols]

[0066] 1. Work vehicle (tractor) 2 Running vehicle 21 PTO shaft 22 Mainframe 23 Floor Step 24 Control Unit 241 Cockpit 242 Gear shift lever 243 Position Lever 25 Rear transmission case 26 Rear axle case 27 Rear fender 30 Safety Frame 31 Lower frame 311 Support member 312 Connectors 32 Upper Frame 33 Connecting part 40 Rear floor mount bracket 41 Bracket fixing part 411 Tabletop 412 Bottom plate 412a Fixed hole 413 Side plate part 413a side plate 413b Insertion hole 414 Holder parts 42 Stay part 421 Proximal end 422 Tip 43 Mounting section 43a Mounting hole 44 Mounting material 51 Hydraulic hose 52 Change bracket 53 Position Link 54 Draft Link P1 Mounting position P2 support position S interior space

Claims

1. A cockpit arranged at the rear of a floor step; Left and right rear axle cases, A safety frame that is attached to the upper part of each of the left and right rear axle cases and is arch-shaped when viewed from the front of the aircraft and is erected behind the cockpit; Rear floor mount brackets that support the rear portions of the floor steps from below on the left and right sides of the aircraft; Equipped with the rear floor mount bracket supports the floor step at a position different from an attachment position of the safety frame to the left and right rear axle cases, The rear floor mount bracket has a bracket fixing portion, left and right stay portions extending laterally to the left and right from the bracket fixing portion, and a mount portion provided at each tip of the left and right stay portions and supporting the floor step, The left and right stay portions are inclined downward from the bracket fixing portion to the tip portion, and are held only by the central bracket fixing portion. A work vehicle characterized by:

2. The mounting position of the safety frame with respect to the rear axle case is disposed below the mount portion.

2. The work vehicle according to claim 1 .

3. The bracket fixing portion comprises a top plate, a bottom plate, and a side plate portion, the side plate portion being erected so that a plurality of side plates are lined up on each of the left and right sides between the top plate and the bottom plate, and each base end of the left and right stay portions is inserted into an insertion hole formed in the plurality of side plates and is fixed in a state of being sandwiched between the plurality of side plates.

2. The work vehicle according to claim 1 .

4. The bracket fixing portion has an internal space penetrating in the front-rear direction, and a hydraulic hose forming an oil passage in a hydraulic system of the aircraft is inserted into the internal space.

4. The work vehicle according to claim 2 or 3,

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