JP2008068830A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle enabling capable of varying weight balance in the longitudinal direction. <P>SOLUTION: The working vehicle 1 is composed of a lower machine body 2 and an upper machine body 3. A lower frame 4 arranged with an engine and a traveling device 8 stored in a hood 6 is provided on the lower machine body 2, and an upper frame 5 loaded with a cabin 7 and a tank 11 is provided on the upper machine body 3, respectively. The upper frame 5 is supported slidably and movably in the longitudinal direction relative to the lower frame 4 by a rail member arranged on the lower frame 4 and slide pieces 31a, 31b fixed to the upper frame 5 with a bolt. Further, a hydraulic cylinder 35 is interposed between the upper frame 5 and the lower frame 4. By driving the hydraulic cylinder 35, the upper machine body 3 is slide-driven in the longitudinal direction relative to the lower machine body 2 and the weight balance in the longitudinal direction of the whole of the working vehicle 1 is varied. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a work vehicle such as a tractor, and more particularly to a work vehicle including a lower frame in which an engine and a traveling device are disposed and an upper frame on which a cabin is loaded.

  In general, in a work vehicle represented by a tractor, a lower frame in which a traveling device having an engine, a transmission, a crawler, and the like are disposed, a cabin that is disposed on the lower frame and has a driver's seat and an operation unit, And an upper frame on which fuel and hydraulic oil are stored.

  In such a working vehicle, a vibration isolator is disposed between the lower frame and the upper frame, and the vibration generated from the prime mover is absorbed by the vibration isolator to improve the comfortability in the cabin. The thing which aimed at the improvement is also proposed (refer patent document 1).

JP-A-8-113159

  By the way, when the work vehicle as described above is attached with a work machine such as a rotary tiller at the rear part of the vehicle, or when a work machine such as a front dozer (attachment device for earthing work) is attached at the front part of the vehicle, There is.

  However, the work vehicle has a large difference in weight balance between the front and the rear when the work machine is attached to the rear part of the vehicle and when the work machine is attached to the front part of the vehicle. The rear part is heavier and the front part of the vehicle is lifted, or conversely, for example, when the front dozer is attached to the front part of the vehicle, the front part is heavier and the rear part of the vehicle is lifted. There has been a problem that stable work cannot be performed.

  In particular, when a work implement is attached to the rear part of the vehicle, a balance weight is attached to the front part of the vehicle to stabilize the weight balance in order to bring the weight balance closer to equilibrium. Since the weight of the entire vehicle increases and particularly the load on the transmission, the traveling device, and the like increases, there is a problem that durability may deteriorate.

  Accordingly, an object of the present invention is to provide a work vehicle that can change the weight balance in the front-rear direction of the work vehicle and solves the above problems.

The present invention according to claim 1 (see, for example, FIGS. 1 to 5) includes a lower frame (4) in which an engine and a traveling device (8) are disposed,
An upper frame (5) loaded with a cabin (7),
The upper frame (5) was supported so as to be movable in the front-rear direction with respect to the lower frame (4).
The working vehicle (1) is characterized by the above.

The present invention according to claim 2 (see, for example, FIGS. 2 to 5) includes a support shaft (38) capable of rotatably supporting the upper frame (5) with respect to the lower frame (4),
The upper frame (5) is configured to be rotatable around the support shaft (38) with respect to the lower frame (4).
It exists in the working vehicle (1) of Claim 1.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, it does not have any influence on description of a claim by this.

  According to the first aspect of the present invention, since the upper frame can be slid in the front-rear direction relative to the lower frame, the weight of the work vehicle in the front-rear direction can be increased by moving the upper frame having the cabin in the front-rear direction. When the balance is changed and the work machine is attached to the work vehicle, the overall weight balance before and after the work can be stabilized, and the vehicle front part or the vehicle rear part can be prevented from being lifted.

  In addition, since the weight balance before and after the work machine is attached to the work vehicle can be stabilized, the use of a balance weight can be eliminated or the weight can be reduced, and the weight of the entire vehicle can be reduced. By reducing the weight of the vehicle, it is possible to reduce the load on the traveling device and the like, and to improve the durability of the work vehicle.

  According to the second aspect of the present invention, since the upper frame is configured to be rotatable about the support shaft with respect to the lower frame, the upper frame can be rotated in the vertical direction with respect to the lower frame. The inside of the frame and the lower part of the upper frame can be opened, and the maintainability of the work vehicle can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  A working vehicle 1 according to the present invention is a tractor as a crawler type traveling vehicle, as shown in FIG. The working vehicle 1 includes a lower body 2 and an upper body 3.

  The lower body 2 includes a lower frame 4. The lower frame 4 includes an engine (not shown) housed in a bonnet 6, a transmission (not shown), and a crawler 23 which will be described in detail later. Etc., and a traveling device 8 made up of, for example, is disposed. Further, a connecting portion 42 for attaching a balance weight is provided at the front end portion of the lower frame 4 (the front side in the traveling direction of the working vehicle, that is, the left side in FIG. 1), and a rotary tiller or the like is provided at the rear portion. A three-point link mechanism 40 to which the working machine is attached is provided. On the other hand, the upper body 3 includes an upper frame 5 disposed on the lower frame 4 behind the bonnet 6, and the upper frame 5 has a driver's seat (not shown) and the like. A cabin 7 and tanks 11 and 12 for storing fuel and hydraulic oil are loaded.

  The traveling device 8 includes a driving sprocket 21 supported by the traveling frame 25 at a front portion of the traveling frame 25, a driven wheel 22 supported by the traveling frame 25 apart from the driving sprocket 21, and the driving sprocket 21. And a crawler 23 wound around the driven wheel 22.

  The follower wheel 22 is supported by an adjuster arm 28 that is slidably inserted into the travel frame 25 so as to be extendable and contractable, so that the tension of the crawler 23 is adjusted by a crawler tension mechanism (not shown). It has become. Further, an upper roller 26 and a plurality of lower rollers 27 are provided above and below the traveling frame 25 so that the crawler 23 is guided.

  As described above, the lower frame 4 is provided with the engine at the front portion thereof, and is provided with the traveling device 8 below, and the portion surrounded by the lower frame 4 and below the cabin 7 is driven. Devices such as a mechanism and a hydraulic mechanism are arranged.

  As shown in FIG. 2, the upper frame 5 is configured by combining square pipe-like members by welding or the like, and is composed of main frames 5c and 5c arranged extending in the front-rear direction, and side frames 5d. , 5d and a plurality of reinforcing members 5g, 5g,... Arranged over the main frame 5c and the side frame 5d. Further, the upper frame 5 includes a front connecting member 5a disposed over the main frames 5c and 5c, and a rear connecting member 5b.

  The front portions of the left and right side frames 5d are bent toward the main frame 5c and connected to the front end of the main frame 5c. Further, step portions 5f serving as scaffolds for getting on and off the cabin 7 are provided on the left and right sides of the main frame 5c and the front portions of the side frames 5d over the main frame 5c and the side frames 5d.

  On the other hand, as shown in FIG. 3 (b), a rail member 4a having a U-shaped cross section that extends in the front-rear direction along the main frame 5c is disposed on the lower frame 4 at a position facing left and right. ing. A main slide piece 31b having an L-shaped cross section is fixed to the main frame 5c of the upper frame 5 by a plurality of bolts 32b so as to sandwich the upper surface 4a 'of the rail member 4a of the lower frame 4 in the vertical direction. Similarly, in the front portion of the front connecting member 5a, the sub slide piece 31a is fixed by a plurality of bolts 32a (see FIG. 2).

  Here, the rail member 4a is configured integrally with the lower frame 4, and the main slide piece 31b and the sub slide piece 31a are fixed so as to be integrated with the upper frame 5, and each of the rail members 4a includes an inner part. Movement in the direction is restricted, and the arrangement is symmetrical. Accordingly, the upper frame 5 is supported so as to be slidable in the front-rear direction while being restricted from moving in the left-right direction with respect to the lower frame 4.

  Further, as shown in FIG. 3A, the upper frame 5 has two hydraulic cylinders (drive devices) 35 at the upper end 35a in the connection portions 5e and 5e provided in the rear connecting member 5b. The hydraulic cylinder 35 is connected to the lower frame 4 at the lower end 35b so as to be freely rotatable.

  Further, the upper frame 5 includes a rotation arm 36 at the rear end of each of the left and right main frames 5c. As shown in FIG. 4, the rotating arm 36 is rotatably connected to a support shaft 38 formed integrally with the lower frame 4 at an end portion 36a, and the arm portion 36b of the rotating arm 36 is A rear end portion of the main frame 5c is nested, and is slidable with respect to the main frame 5c. Further, the rotating arm 36 is configured such that the arm portion 36b is fixed to the upper frame 5 by a pin (not shown) and cannot be slid with respect to the upper frame 5. ing.

  As shown in FIG. 1, an extendable cover 41 is disposed between the bonnet 6 and the cabin 7 to prevent dirt, dust, and the like from entering the inside of the aircraft.

  By the way, since the working vehicle 1 according to the present embodiment is configured such that the upper frame 5 is movable with respect to the lower frame 4, the lower machine body 2 and the upper machine body 3 are manufactured separately. As a result, the lower machine body 2 and the upper machine body 3 can be separated from each other, so that the work such as painting can be facilitated, and the operation unit is left on the lower machine body 2 side and transported. It becomes easy to remodel as a car.

  As shown in FIG. 4, the work vehicle 1 configured as described above is operated so as to drive the hydraulic cylinder 35 in the extending direction when, for example, a rotary tiller is mounted on the rear three-point link mechanism 40. Thus, the upper frame 5 is slid forward with respect to the lower frame 4, that is, the upper body 3 is moved forward (position indicated by a two-dot chain line 51). Thereby, it is possible to prevent the center of gravity of the work vehicle 1 from being biased to the rear side, and to perform work stably. At this time, the pivot arm 36 is connected to a support shaft 38 formed integrally with the lower frame 4, but is not affected because it is slidable with respect to the main frame 5 c of the upper frame 5. .

  For example, when a front dozer is mounted on the front portion of the lower frame 4 using a bracket or the like, the upper frame 5 is moved backward with respect to the lower frame 4 by operating the hydraulic cylinder 35 in the contracting direction. The upper body 3 is moved rearward (position indicated by a two-dot chain line 52). As a result, the center of gravity of the work vehicle 1 can be prevented from being biased forward, and the work can be performed stably.

  On the other hand, when the work vehicle 1 is maintained, the plurality of bolts 32a and 32b are removed, the left and right main slide pieces 31b and the sub slide pieces 31a are removed, and the left and right turning arms 36 are connected to the upper frame 5 with pins. The expansion / contraction cover 41 is removed, and the hydraulic cylinder 35 is driven in the extending direction. As a result, as shown in FIG. 5, the upper airframe 3 is rotated upward with the support shaft 38 as a rotation fulcrum, and the portion that has been located below the cabin 7 is opened and surrounded by the lower frame 4. Maintenance of a device such as a drive mechanism or a hydraulic mechanism disposed in the portion, a device disposed on the lower surface side of the cabin 7 or the like is facilitated.

  As described above, according to the working vehicle 1 according to the present invention, the upper frame 5 can be slid in the front-rear direction with respect to the lower frame 4, so that the upper frame 5 having the cabin 7 can be moved in the front-rear direction. The weight balance in the front-rear direction of the work vehicle 1 can be changed to stabilize the overall weight balance in the front-rear direction when the work machine is attached to the work vehicle 1, thereby preventing the vehicle front part or the vehicle rear part from being lifted. Can do.

  In addition, since the weight balance before and after the work machine is attached to the work vehicle 1 can be stabilized, the use of a balance weight can be eliminated or the weight can be reduced. By reducing the weight, the load on the traveling device 2 and the like can be reduced, and the durability of the work vehicle 1 can be improved.

  Further, since the upper frame 5 is configured to be rotatable about the support shaft with respect to the lower frame 4, the upper frame 5 can be rotated in the vertical direction with respect to the lower frame 4. And the lower part of the upper frame 5 can be opened, and the maintainability of the work vehicle 1 can be improved.

  In the present embodiment, the case where the driving device is used when the upper frame is moved in the front-rear direction with respect to the lower frame has been described. However, the present invention is not limited thereto, and may be moved manually, for example. .

  In the present embodiment, the case where a hydraulic cylinder is used as the drive device has been described. However, the present invention is not limited to this. For example, a ball screw type actuator may be used. Any drive device may be used as long as it can be used.

  In the present embodiment, the case where the upper frame can be moved in the front-rear direction with respect to the lower frame has been described as being slid between a rail-shaped member and a member serving as a guide thereof. For example, a guide roller may be used, that is, any structure may be used as long as the upper frame is restricted from moving in the left-right direction and can move in the front-rear direction.

The side view which shows a working vehicle. The perspective view which shows an upper body. It is a figure which shows an upper frame and a peripheral part, (a) is a B arrow directional view of FIG. 2, (b) is AA sectional drawing of FIG. The side view which shows the slide movement of an upper body. The perspective view which shows the rotational movement of an upper body.

Explanation of symbols

1 Working vehicle 4 Lower frame 5 Upper frame 7 Cabin 8 Traveling device 35 Drive device 38 Support shaft

Claims (2)

A lower frame provided with an engine and a traveling device;
An upper frame on which the cabin is loaded,
The upper frame is supported so as to be movable in the front-rear direction with respect to the lower frame.
A working vehicle characterized by that. A support shaft that can rotatably support the upper frame with respect to the lower frame;
The upper frame is configured to be rotatable with respect to the lower frame around the support shaft.
The working vehicle according to claim 1.

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