JP2024061114A - Work vehicles - Google Patents

Abstract

[Problem] 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. [Solution] A work vehicle 1 is provided with a roof guard 70 on a cockpit 16, the roof guard 70 comprising a frame 72 fixed to the front of the upper surface of the cockpit 16, a front guard 74 hinged to a rear frame 72d of the frame 72 so as to be rotatable in the vertical direction, and a rear guard 76 having a front portion 110 fixed to the rear frame 72d of the frame 72, the frame 72 and the front guard 74 being connected by a slide stay 100, which regulates the maximum opening position of the frame 72 and the front guard 74, and is capable of maintaining the open state at the maximum opening position. [Selected Figure] Figure 2

Description

The present invention relates to a work vehicle equipped with a hydraulically operated working device.

Conventionally known examples of work vehicles include excavators and loaders, which have a lower body to which tires or crawlers for running are attached, an upper body disposed on the lower body, and a hydraulically operated working device attached to the lower body or upper body.

Work vehicles such as those described above are equipped with a roof guard to protect the cockpit from falling rocks and other objects. The roof guard is fixed to the top of the cockpit with fixing members such as bolts, and when cleaning or maintenance is performed, all fixing members must be removed and the entire roof guard must be removed.

Japanese Patent Application Laid-Open No. 8-109658 Patent No. 5393850

Patent Document 1 (see JP Patent Publication 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, allowing it to rotate back and forth. 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 was an issue that the ceiling could bend due to the load caused by opening and closing the roof guard, creep, and impact from falling objects. In addition, because the opening of the roof guard is held in place by a gas cylinder, if a malfunction occurs in the gas cylinder, the roof guard cannot be supported, which could lead to a pinch accident. In addition, there was an issue that assembly was difficult because parts were attached directly to the top surface of the cockpit.

In contrast to Patent Document 1, Patent Document 2 (see Patent Publication No. 5,393,850) discloses a roof guard in which a fixed frame is fixed to the top surface of the cockpit and an opening/closing guard part is rotatably attached to the fixed frame. This configuration enhances the ceiling deflection prevention effect, but the fixed frame needs to have a robust structure to prevent deflection of the fixed frame.

The present invention was made in consideration of the above circumstances, and aims 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.

The present invention solves the above problems by the solutions described below.

The work vehicle according to the present invention is a work vehicle in which a roof guard is provided in the cockpit, and the roof guard comprises a frame body fixed to the front of the upper surface of the cockpit, a front guard hinged to the rear frame of the frame body so as to be rotatable in the vertical direction, and a rear guard whose front part is fixed to the rear frame of the frame body, and the frame body and the front guard are connected by a slide stay, and the slide stay is required to regulate the maximum opening position of the frame body and the front guard, and to be able to maintain the open state at the maximum opening position.

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

In addition, it is preferable that a pair of pivoting connecting members for pivoting the front guard is provided on the rear frame of the frame body, and the pivoting connecting members are fixed to the front guard via a reinforcing member.

In addition, it is preferable that the front portion of the rear guard is fixed to the rear frame of the frame body by a fixing member or by welding between the pivoting connecting members.

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.

It is also preferable that an elastic body for shock absorption is attached to the contact surface between the frame body and the front guard.

The present invention provides 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.

FIG. 1 is a perspective view showing an example of a work vehicle according to an embodiment of the present invention. Fig. 2A is a perspective view showing a closed state of the roof guard of the work vehicle of Fig. 1. Fig. 2B is a perspective view showing an open state of the roof guard of the work vehicle of Fig. 1. FIG. 3 is a plan view of the roof guard. FIG. 4 is a perspective view of the roof guard from below. FIG. 5 is an enlarged view of part V in FIG. 2A. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG.

The following describes in detail an embodiment of the present invention 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 ease of explanation, arrows may be used in the drawings to indicate up/down, left/right, and front/rear directions. In addition, in all drawings used to explain the embodiment, components having the same function are given the same reference numerals, and repeated explanations may be omitted.

First, the overall configuration of the work vehicle 1 will be described. An excavator will be used as an example of the work vehicle 1. However, the work vehicle 1 is not limited to an excavator.

As shown in FIG. 1, the work vehicle 1 has a lower body 2 to which a traveling device 10 is attached. The work vehicle 1 has an upper body 3 that is disposed on the lower body 2 so as to be able to turn via a swivel bearing (not shown). The work vehicle 1 has working devices 12, 14 that are attached to the lower body 2 and the upper body 3 and are hydraulically operated.

The upper body 3 is provided with a cockpit (cabin or canopy) 16 at the front where the worker (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 work devices 12, 14 in response to the operation of the worker. The upper body 3 is provided with an equipment room 20 at the rear that houses the drive source (in this embodiment, an engine) 18. However, the drive source 18 is not limited to an engine. As a variant, the work vehicle 1 may be configured to include a battery-powered electric motor instead of or in addition to the engine (not shown).

As an example of the traveling device 10, it has four traveling wheels 26, two at the front and two at the back. The traveling wheels 26 have tires 26B fitted to the outer periphery of the 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).

The running wheels 26 are driven by a running hydraulic motor (not shown). The running 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 running device 10 operates by receiving pressurized oil delivered from the hydraulic pump.

An example of the working device 12 is a blade 22. The blade 22 is attached to the lower body 2 so that it can swing 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.

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 a 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) relative 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.

The hydraulic cylinders are 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 are operated by receiving pressurized oil delivered from the hydraulic pump.

Note that other mechanisms for driving and working in the work vehicle 1 according to this embodiment are similar to those of known work vehicles (excavators), so detailed explanations will be omitted.

Next, the roof guard 70, which is a feature 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 that spans these frames.

The roof guard 70 comprises a frame body 72, a front guard 74, and a rear guard 76.

As shown in Figures 3 and 4, the frame body 72 is a generally rectangular frame body in a 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 a plan view.

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

The front frame 72c is arranged to span the front ends of the left frame 72a and the right frame 72b using a single metal plate.

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

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 also be formed by integral molding using a mold or other known molding methods.

The front guard 74 is a lattice-shaped guard member in which multiple 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 to the rear frame 72d by a pivoting connecting member 86 so that it can pivot up and down.

Specifically, the rear frame 72d is joined to the pivotable connecting member 86 by inserting a fixing member 88 into a through hole 88a drilled 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 U-shaped reinforcing member 94 that 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 the rib 90 with the rear end cut out on the reinforcing member 94 and welding it.

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 of the front guard 74, and the other end of the arm 100a is slidably attached to a rail 100b fixed to the right frame 72b. In other words, 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. Note that the slide stay 100 is not limited to the right frame 72b, and may be provided on the left frame 72a or both.

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. In other words, 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 where someone gets pinched by the front guard 74, since the open state is maintained until the front guard 74 is lifted again to release the lock.

Brackets 120 are formed on both sides of the front end of the front guard 74 (the side not hinged to the rear frame 72d). 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.

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

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

The front portion 110 is disposed on the rear frame 72d, and the fixing member 82 is inserted through the through-hole 82a drilled 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 drilled 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 way, 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 bending due to loads caused by opening and closing the front guard 74, creep, impacts from falling objects, etc. In addition, there is no need to make the frame body (fixed frame) robust (large and heavy) or to install 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-hole 84a.

A locking member (not shown) corresponding to the through hole 80a drilled in the bracket 112 formed on the left frame 72a, right frame 72b, rear frame 72d, and both rear sides of the rear guard 76 is 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 member 80 into the through hole 80a. In this way, the roof guard 70, which is pre-assembled as a single 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.

In this embodiment, an elastic body 130 (e.g., an elastomer, etc.) is attached to the surface 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 sides 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 passing through the frame body 72, the impact that is transmitted to the upper surface of the cockpit 16 can be dispersed.

As explained above, the above work vehicle can realize a roof guard that is easy to clean and assemble, and has a lightweight, simple structure that prevents bending.

The present invention is not limited to the above embodiment (excavator). The present invention can be similarly applied to other work vehicles (loaders, carriers, etc.).

Reference Signs List 1 Working vehicle 2 Lower body 3 Upper body 10 Traveling device 12, 14 Working device 16 Cab 70 Roof guard 72 Frame 74 Front guard 76 Rear guard

Claims (5)

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 a maximum opening position between the frame body and the front guard, and is capable of maintaining an open state at the maximum opening position. A pair of pivot connecting members for pivoting the front guard is provided on the rear frame of the frame body,
2. The work vehicle according to claim 1, wherein the pivotable connecting member is fixed to the front guard via a reinforcing member. 3. The work vehicle according to claim 2, wherein the front portion of the rear guard is fixed to the rear frame of the framework between the pivot connecting members by a fixing member or by welding. 4. The work vehicle according to claim 3, wherein in a closed state, an end of the front guard on a side of the frame body that is not hinged to the rear frame is fixed to the frame body by a fixing member. 5. The working vehicle according to claim 4, wherein an elastic body for absorbing shock is attached to a contact surface between said frame and said front guard.

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