Work vehicles

Abstract

To provide a work vehicle equipped with a roof guard that is excellent in cleanability and assemblability, and is lightweight and has a simple structure to prevent deflection.SOLUTION: In a work vehicle 1 in which a roof guard 70 is provided in a control cabin 16, the roof guard 70 includes a frame 72 fixed to the front of an upper surface of the control cabin 16, a front guard 74 hinged to a rear frame 72d of the frame 72 so as to be pivotable in the vertical direction, and a rear guard 76 to which a front portion 110 is fixed to the rear frame 72d of the frame 72. The frame 72 and the front guard 74 are connected by a slide stay 100. The slide stay 100 regulates a maximum open position of the frame 72 and the front guard 74, and is capable of maintaining the open state at the maximum open position.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a work vehicle equipped with a hydraulically operated working device. [Background technology]

[0002] As examples of working vehicles, excavators, loaders, etc. have been known which are equipped with a lower body to which tires or crawlers for traveling are attached, an upper body disposed on the lower body, and a working device attached to the lower body or upper body and operated hydraulically.

[0003] Such work vehicles are provided with a roof guard to protect the cockpit from falling rocks, etc. The roof guard is fixed to the top of the cockpit with fixing members such as bolts, and when cleaning or maintenance is performed, it is necessary to remove all of the fixing members and remove the entire roof guard. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-109658 [Patent Document 2] Patent No. 5393850 Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Document 1 (see Japanese Patent Laid-Open Publication No. 8-109658) discloses a roof guard in which both upper ends of the roof guard are pivotally attached to a pair of left and right brackets fixed to the cockpit, and which can rotate in the front-rear direction. With this configuration, the roof guard can be opened and closed with a single touch, eliminating the need to remove and attach fixed members every time cleaning is performed. However, there is a problem that the ceiling may bend due to the load caused by opening and closing the roof guard, creep, impact from falling objects, etc. In addition, since the opening of the roof guard is held by a gas cylinder, if a malfunction occurs in the gas cylinder, the roof guard cannot be supported, which may lead to a pinching accident. In addition, there is a problem that the assembly is difficult because the parts are directly attached to the top surface of the cockpit.

[0006] In contrast to Patent Document 1, Patent Document 2 (see Japanese Patent Publication No. 5393850) discloses a roof guard in which a fixed frame is fixed to the top surface of the cockpit and an open / close guard part is rotatably attached to the fixed frame. Although this configuration can improve the effect of preventing the ceiling from bending, it is necessary to make the fixed frame have a robust structure to prevent bending of the fixed frame. [Means for solving the problem]

[0007] The present invention has been made in consideration of the above circumstances, and has an object to provide a work vehicle equipped with a roof guard that is easy to clean and assemble, and that is lightweight and has a simple structure to prevent bending.

[0008] The present invention solves the above problems by the means described below.

[0009] The work vehicle of the present invention is a work vehicle in which a roof guard is provided in a cockpit, the roof guard comprising a frame body fixed to the front of the upper surface of the cockpit, a front guard hinged so as to be rotatable in the vertical direction relative to the rear frame of the frame body, and a rear guard the front of which is fixed to the rear frame of the frame body, the frame body and the front guard being connected by a sliding stay which regulates the maximum opening position of the frame body and the front guard and is capable of maintaining the open state at the maximum opening position.

[0010] According to the above configuration, the front guard can be opened by lifting one end of the front guard through rotation, improving cleaning performance. When the front guard is lifted to the maximum open position, the slide stay automatically locks the open state, preventing accidents involving pinching by the front guard. Furthermore, by disposing the front guard via a frame on the top surface of the operator compartment, time-consuming positioning is no longer necessary when attaching the front guard, improving assembly performance. Furthermore, the lightweight and simple structure can suppress deflection of the rear frame.

[0011] It is also preferable that a pair of pivotal connecting members for pivoting the front guard are provided on the rear frame of the framework, and the pivotal connecting members are fixed to the front guard via a reinforcing member.

[0012] It is also preferable that the front portion of the rear guard is fixed to the rear frame of the framework by a fixing member or by welding between the pivot connecting members.

[0013] In addition, in the closed state, it is preferable that the end of the front guard on the side of the frame body that is not hinged to the rear frame is fixed to the frame body by a fixing member.

[0014] It is also preferable that a shock absorbing elastic body be attached to the contact surface between the frame and the front guard. Effect of the Invention

[0015] According to the present invention, it is possible to provide a work vehicle equipped with a roof guard that is easy to clean and assemble, and that is lightweight and has a simple structure to prevent bending. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view showing an example of a work vehicle according to an embodiment of the present invention. [Diagram 2] Fig. 2A is a perspective view showing a closed state of the roof guard of the working vehicle of Fig. 1. Fig. 2B is a perspective view showing an open state of the roof guard of the working vehicle of Fig. 1. [Diagram 3] FIG. 3 is a plan view of the roof guard. [Figure 4] FIG. 4 is a perspective view of the roof guard from below. [Diagram 5] FIG. 5 is an enlarged view of part V in FIG. 2A. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a schematic diagram (perspective view from above the left front) showing an example of a work vehicle 1 according to this embodiment. For convenience of explanation, arrows may be used in the drawings to indicate up / down, left / right, and front / rear directions. In addition, in all drawings for explaining the embodiment, members having the same function are given the same reference numerals, and repeated explanations thereof may be omitted.

[0018] First, an explanation will be given of the overall configuration of the work vehicle 1. An excavator will be taken as an example of the work vehicle 1. However, the work vehicle 1 is not limited to an excavator.

[0019] As shown in Fig. 1, the work vehicle 1 is equipped with a lower body 2 to which a traveling device 10 is attached. The work vehicle 1 is equipped with an upper body 3 disposed on the lower body 2 so as to be rotatable via a swivel bearing (not shown). The work vehicle 1 is equipped with working devices 12, 14 attached to the lower body 2 and the upper body 3 and operated hydraulically.

[0020] The upper body 3 is provided with a cockpit (cabin or canopy) 16 at the front where an operator rides and drives the vehicle and performs operations. The upper body 3 is provided with a control device 60 that controls the traveling device 10 and the working devices 12, 14 in response to the operation of the operator. The upper body 3 is provided with an equipment room 20 at the rear in which a drive source 18 (in this embodiment, an engine) is housed. However, the drive source 18 is not limited to an engine. As a modified example, the work vehicle 1 may be configured to include a battery-powered electric motor instead of or in addition to the engine (not shown).

[0021] An example of the traveling device 10 is equipped with four traveling wheels 26, two at the front and two at the back. The traveling wheels 26 have tires 26B fitted onto the outer periphery of wheels 26A (there are both single and double types). However, the traveling device 10 is not limited to the traveling wheels 26. As a modified example, the work vehicle 1 may be configured to have caterpillars (crawlers) instead of the traveling wheels 26 (not shown).

[0022] The traveling wheels 26 are driven by a traveling hydraulic motor (not shown). The traveling hydraulic motor is operated by hydraulic pressure. A hydraulic pump (not shown) that generates the hydraulic pressure is disposed in the upper body 3. The hydraulic pump is driven by the drive source 18. In other words, the traveling device 10 operates by receiving pressure oil delivered from the hydraulic pump.

[0023] An example of the working device 12 includes a blade 22. The blade 22 is attached to the lower body 2 so as to be swingable up and down (including forward and backward). The blade 22 is driven by a hydraulic cylinder 32. However, the working device 12 is not limited to the above configuration.

[0024] Examples of the working device 14 include a boom 42, an arm 44, and an attachment (a bucket in this embodiment) 46. However, the attachment 46 is not limited to the bucket. The boom 42 is attached to the upper body 3 so as to be swingable up and down (including a front-rear component). In this embodiment, a boom bracket 48 is provided between the upper body 3 and the boom 42. The boom bracket 48 allows the boom 42 to swing left and right (including a front-rear component) with respect to the upper body 3. Note that the boom bracket 48 may be omitted. The arm 44 is attached to the boom 42 so as to be swingable up and down (including a front-rear component). The attachment 46 is attached to the arm 44 so as to be swingable up and down (including a front-rear component). The boom 42 is driven by a hydraulic cylinder 52. The arm 44 is driven by a hydraulic cylinder 54. The attachment 46 is driven by a hydraulic cylinder 56. However, the working device 14 is not limited to the above configuration.

[0025] Each of the hydraulic cylinders described above is operated by hydraulic pressure. A hydraulic pump (not shown) that generates the hydraulic pressure is disposed in the upper body 3. The hydraulic pump is driven by a drive source 18. In other words, the working devices 12, 14 described above are operated by receiving pressure oil delivered from the hydraulic pump.

[0026] It should be noted that other mechanisms for travel and work in the work vehicle 1 according to this embodiment are similar to those of known work vehicles (excavators), and therefore detailed description will be omitted.

[0027] Next, the roof guard 70, which is characteristic of this embodiment, will be described in detail. As shown in Fig. 1, the roof guard 70 is provided on the upper surface of the cockpit 16 to protect the cockpit 16 from falling rocks and the like. Note that the "upper surface" of the cockpit 16 here refers collectively to the upper end portions of the side frames 16a of the cockpit 16, the front upper frame 16b and the rear upper frame 16c that span the side frames 16a, and the ceiling stretched across these frames.

[0028] The roof guard 70 includes a frame 72 , a front guard 74 , and a rear guard 76 .

[0029] 3 and 4, the frame body 72 is a generally rectangular frame body in plan view, consisting of four sides: a left frame 72a, a right frame 72b, a front frame 72c, and a rear frame 72d. If the work vehicle 1 is equipped with a skylight, the frame body 72 is formed to generally coincide with the outer edge of the skylight in plan view.

[0030] The left frame 72a and the right frame 72b are formed by using a single metal plate and bending the front end (hereinafter referred to as the front end) downward so as to conform to the shape of the upper surface of the cockpit 16. A through hole 80a through which a fixing member (e.g., a bolt, etc.) 80 is inserted is formed in the front end of the left frame 72a and the right frame 72b. Furthermore, a through hole 82a through which a fixing member (e.g., a bolt, etc.) 82 is inserted is formed in the rear end of the left frame 72a and the right frame 72b.

[0031] The front frame 72c is made of a single metal plate and is disposed so as to bridge the front ends of the left frame 72a and the right frame 72b.

[0032] The rear frame 72d is disposed so as to bridge the rear ends of the left frame 72a and the right frame 72b using one metal plate. At both ends in the left-right direction of the rear frame 72d, a through hole 80a through which the fixing member 80 is inserted is formed. In addition, immediately inside the through hole 80a, a through hole 82a through which the fixing member 82 is inserted is formed. In addition, inside the through hole 82a, a wide portion to which a rotation connecting member (e.g., a hinge, etc.) 86 is hinged is formed protruding forward, and the wide portion is formed with a through hole 88a through which a fixing member (e.g., a bolt, etc.) 88 is inserted. Furthermore, inside the wide portion (i.e., between the pair of rotation connecting members 86), at least one (three in this embodiment) through hole 84a through which a fixing member (e.g., a bolt, etc.) 84 is inserted is formed.

[0033] In this embodiment, the front frame 72c and the rear frame 72d are welded to the left frame 72a and the right frame 72b, respectively, and are integrally formed as the frame body 72. However, the frame body 72 may be formed by integral molding using a mold or other known molding methods.

[0034] The front guard 74 is a lattice-shaped guard member in which a plurality of ribs 90 are connected at regular intervals in the left-right direction. The front guard 74 is disposed above the frame body 72 and is hinged by a rotation connecting member 86 to the rear frame 72d so as to be rotatable in the up-down direction.

[0035] Specifically, the rear frame 72d is joined to the pivotable connecting member 86 by inserting a fixing member 88 into a through hole 88a formed in the wide portion and the rear end of the pivotable connecting member 86. On the other hand, as shown in FIG. 6, the front guard 74 has a reinforcing member 94 that is U-shaped in side view and opens downward at the rear, and the reinforcing member 94 has a reinforcing block 96 in the concave portion, and the front end of the pivotable connecting member 86 is welded to the reinforcing block 96. In addition, a reinforcing member 98 that is L-shaped in side view is welded below the reinforcing member 94, and the reinforcing members 94, 98 are formed to have a square tube structure. This makes it possible to reinforce the joint between the front guard 74 and the pivotable connecting member 86, and also to increase the strength of the front guard 74 by placing and welding a rib 90 with a notched rear end on the reinforcing member 94.

[0036] The frame 72 and the front guard 74 are connected by a slide stay 100. Specifically, one end of an arm 100a is rotatably attached to the right side surface of the front guard 74, and the other end of the arm 100a is slidably attached to a rail 100b fixed onto the right frame 72b. That is, the arm 100a slides on the rail 100b in conjunction with the opening and closing of the front guard 74, and the opening range (maximum opening position) of the front guard 74 is restricted by the rail 100b. The slide stay 100 may be provided not only on the right frame 72b but also on the left frame 72a or on both.

[0037] A recess 100c is provided at the innermost side of the rail 100b (the position where the front guard 74 is at its maximum opening), and the arm 100a drops into the recess 100c to restrict sliding. That is, when the front guard 74 is opened to its maximum opening position, the slide stay 100 is automatically locked, and the open state of the front guard 74 is maintained at the maximum opening position. This prevents accidents of being pinched by the front guard 74, since the open state is maintained until the front guard 74 is lifted again to release the lock.

[0038] Brackets 120 are formed on both side surfaces of the front end (side not hinged to the rear frame 72d) of the front guard 74. In the closed state, the front guard 74 is fixed to the frame body 72 by inserting a fixing member (e.g., a bolt or the like) 124 through the bracket 120 and a locking member 122 fixed to the left frame 72a and the right frame 72b by welding or the like. To open the front guard 74, the fixing member 124 is removed, and the front guard 74 can be opened simply by lifting the handle 92 formed in front of the front guard 74. This makes it possible to simplify the cleaning process in particular, since it is not necessary to remove all the fixing members that fix the roof guard to the cockpit every time the front guard 74 is opened.

[0039] The rear guard 76 is a box-shaped guard member having a plurality of ribs connected at regular intervals in the left-right direction on its underside. The rear guard 76 is disposed behind the frame 72, and a front portion 110 formed at the front end of the rear guard 76 is fixed to the rear frame 72d.

[0040] The front portion 110 is configured using a single metal plate that is L-shaped in side view and welded to the rear guard 76, and a through hole 82a through which the fixing member 82 is inserted is drilled at both ends in the left-right direction of the upper surface (the long surface of the L shape). A recess is formed inside the through hole 82a to avoid the rotational connecting member 86. At least one (three in this embodiment) through hole 84a through which the fixing member 84 is inserted is drilled inside the recess (i.e., between the pair of rotational connecting members 86).

[0041] The front portion 110 is disposed on the rear frame 72d, and the fixing member 82 is inserted through the through-hole 82a formed in the left frame 72a, the right frame 72b, the rear frame 72d, and the front portion 110, and the fixing member 84 is inserted through the through-hole 84a formed in the rear frame 72d and the front portion 110, so that the frame body 72 and the rear guard 76 are integrally assembled as the roof guard 70. In this manner, the rear frame 72d is held down by the front portion 110, and the rotating connecting members 86 are fastened by the fixing member 84, so that the rear frame 72d is reinforced and can be prevented from being deflected due to loads caused by opening and closing the front guard 74, creep, impacts caused by falling objects, and the like. In addition, it is not necessary to construct the frame body (fixed frame) to be robust (large and heavy) or to provide a new frame in the cockpit 16 as in the conventional technology, and a roof guard with a lightweight and simple structure can be obtained. The rear frame 72d and the front portion 110 may be joined by welding without drilling the through-holes 84a.

[0042] Locking members (not shown) corresponding to through holes 80a drilled in brackets 112 formed on the left frame 72a, right frame 72b, rear frame 72d, and both rear side surfaces of the rear guard 76 are fixed to the top surface of the cockpit 16 (specifically, the frame portions of the side frames 16a, front upper frame 16b, and rear upper frame 16c) by welding or the like, and the roof guard 70 is fixed to the top surface of the cockpit 16 by inserting the fixing members 80 into the through holes 80a. In this way, the roof guard 70, which has been pre-assembled as an integral unit, is attached to the cockpit 16, eliminating the need for time-consuming work such as fine positioning with the rotating connecting member 86 and the slide stay 100, improving ease of assembly.

[0043] In this embodiment, an elastic body 130 (e.g., an elastomer or the like) is attached to the surfaces of the left frame 72a and the right frame 72b, and a receiving portion 132 that comes into contact with the elastic body 130 is formed on both the left and right side surfaces of the front guard 74. This makes it possible to suppress the impact that occurs when the front guard 74 and the frame body 72 collide when the front guard 74 is closed. In addition, by using the frame body 72, the impact that is transmitted to the upper surface of the cockpit 16 can be dispersed.

[0044] As described above, the above-mentioned work vehicle can provide a roof guard that is easy to clean and assemble, and that is lightweight, has a simple structure, and is therefore able to prevent bending.

[0045] The present invention is not limited to the above embodiment (excavator), and can be similarly applied to other work vehicles (loaders, carriers, etc.). [Explanation of symbols]

[0046] 1. Work vehicles 2 Lower body 3. Upper body 10 Running gear 12, 14 Working equipment 16 Cockpit 70 Roof Guard 72 Frame 74 Front Guard 76 Rear guard

Claims

1. A work vehicle having a roof guard in a cockpit, the roof guard comprises a frame body fixed to a front upper surface of the cockpit, a front guard hinged to a rear frame of the frame body so as to be rotatable in a vertical direction, and a rear guard the front of which is fixed to the rear frame of the frame body, The frame body and the front guard are connected by a slide stay, The slide stay regulates the maximum opening position between the frame body and the front guard, and is capable of maintaining the open state at the maximum opening position. A work vehicle characterized by:

2. A pair of pivot connecting members for pivoting the front guard is provided on the rear frame of the frame body, The pivotable connecting member is fixed to the front guard via a reinforcing member.

2. The work vehicle according to claim 1,

3. The front portion of the rear guard is fixed to the rear frame of the frame body between the pivot connecting members by a fixing member or by welding.

3. The work vehicle according to claim 2,

4. In the closed state, the end of the front guard on the side of the frame body that is not hinged to the rear frame is fixed to the frame body by a fixing member.

4. The work vehicle according to claim 3,

5. A shock-absorbing elastic body is attached to the contact surface between the frame and the front guard.

5. The work vehicle according to claim 4,

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