JP4372045B2 - Body frame of work vehicle - Google Patents

Description

  The present invention relates to a body frame of a small work vehicle having a pair of left and right work booms that extend forward from the rear of a driver seat through both sides of the driver seat.

Conventionally, a driver's seat is arranged at the front part of a main frame having a pair of left and right front wheels and a rear wheel, and an engine room is arranged at the rear part, and a boom support part standing on the rear part of the main frame passes through both sides of the driver's seat. A small work vehicle having a pair of left and right work booms extending forward is disclosed in, for example, Patent Document 1 and Patent Document 2, and a work attachment such as a bucket is attached to the tip of the boom in front of the driver seat. It is often used to load and remove relatively lightweight compost and earth and sand for agriculture and civil engineering.
Japanese Utility Model Publication No. 7-24439 (FIGS. 2 and 10) JP 2001-64997 (FIG. 2)

  The main frame of the conventional work vehicle has an engine chamber formed by a left and right side frame and a bottom frame connecting the side frames to form a concave cross section with an upper surface opening. And transmissions, hydraulic pumps, etc. A boom support frame for supporting the work boom is fixedly erected on the rear upper surface of the side frame by welding. Further, the rear and upper surfaces of the engine compartment are opened for maintenance of the engine and the radiator, and a back door and an upper door are respectively attached.

  In recent years, this type of vehicle has a small turn, and for example, when destroying a building or building, the demand for heavy work such as running inside to destroy a concrete structure or a wooden structure is increasing. is there.

  However, since it is originally intended for light work, there is a problem that maintenance is important and large structural strength and material strength are not required. Usually, when the strength is emphasized, there is a possibility that the maintenance of the engine room may be deteriorated due to a complicated structure.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle body frame for a working vehicle that solves the above-described problems and can ensure sufficient structural strength and does not deteriorate maintainability.

  According to the first aspect of the present invention, the driver's seat is disposed at the front portion of the vehicle body, and the pair of left and right work booms are disposed so as to extend forward from both sides of the rear portion of the vehicle body through both sides of the driver's seat. A vehicle body frame of a working vehicle provided with a work tool at a front part of a boom, having left and right side walls connected to each other via a connecting member, supporting a driver's seat at the front part, and an engine compartment at the rear part A main frame formed; a boom support portion provided at an upper rear portion of the side wall to support the fixed end of the work boom via a horizontal support shaft in the vehicle body width direction; and a rear portion of the engine chamber A rear opening / closing door attached to the left and right side walls so as to be openable and closable, and an upper surface opening / closing door attached to the left and right side walls at the rear upper part of the engine compartment. Between the back Connecting the tie bars between the closing and the top door, and said tie bar and the side wall via fasteners is obtained by a detachable.

  The invention according to claim 2 is that the side wall outer plate and the back plate and the boom support portion outer plate and the rear plate are processed into a single thick plate, and the side wall and the boom support portion are integrated. A part of the outer plate between the back plates is cut out, and a tie bar mounting jig for mounting the tie bar is attached.

  According to the first aspect of the present invention, since the tie bar is detachably connected between the rear opening / closing door and the upper opening / closing door between the side walls at the rear of the engine compartment, the structural strength of the main frame including the boom support portion is improved. The work boom can be supported with high strength. Moreover, the rear upper surface and the rear surface of the engine room can be opened continuously by opening the rear door and the upper surface door and releasing the tie bar, so that the maintainability to the engine room is not deteriorated. .

  According to the second aspect of the present invention, the side wall of the main frame and the boom support portion are integrally formed by attaching an outer plate formed by processing one thick plate, and the rear portion of the outer plate. The strength of the side wall of the main frame and the boom support portion can be significantly improved by integrally molding the back plate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Embodiment 1]
This work vehicle is a small work vehicle generally called a “skid steer loader”. As shown in FIGS. 6 to 8, the work vehicle includes a vehicle body 1 having a pair of left and right front wheels 12 </ b> A and 12 </ b> B at the front and rear, respectively. A driver's seat 2 having a head guard 3 is disposed at the front, and a pair of left and right uprights (boom support portions) 4 are provided at the rear upper part of the vehicle body 1. On the uprights 4, 4, the fixed ends of the left and right work booms 5, 5 are respectively supported so as to be able to swing up and down via a main horizontal support shaft 6 in the vehicle body width direction. A bucket 8 that is one of work attachments (work implements) is supported through an L-shaped bracket 7 so as to be swingable up and down. The upright 4 has a boom lifting cylinder 9 that swings the work boom 5 up and down below the work boom 5 and is supported by a sub-horizontal support shaft 10 so as to be swingable up and down. Is connected to the rear portion of the bracket 7. A bucket cylinder 11 that swings the bucket 8 in the vertical direction is connected between the cross member 7 a connected between the brackets 7 and the bucket 8. The vehicle is steered by adjusting the direction and speed of rotation of the left front and rear wheels 12A and 12B and the right front and rear wheels 12A and 12B by a steering lever (not shown) in the driver's seat.

  As shown in FIGS. 1 to 5, the vehicle body 1 includes a bottom frame 23 and a front frame 24, which are connecting members, and left and right side walls 22 connected to each other by a cross member 25. An engine chamber 20 is formed in the main frame 21 to accommodate the engine E, the radiator E, the radiator fan EF, the silencer, the transmission, the hydraulic pump unit, and the like. The left and right side walls 22 are provided with axle bearings 26A and 26B that rotatably support the axles of the front and rear wheels 12A and 12B, respectively.

  A tailgate (rear opening / closing door) 31 is attached between the left and right side walls 22, 22 on the rear rear surface of the engine compartment 20 through a right hinge, and on the rear upper surface of the engine compartment 20 on the left and right sides. A bonnet (upper surface opening / closing door) 32 is attached between the side walls 22 and 22 through a front hinge so as to be freely opened and closed.

  The left and right side walls 22, 22 of the main frame 21 have a main side plate 22a, an internal reinforcing wall 22b attached to the bottom side inner surface of the main side plate 22a, and an upper surface flange 22c bent outward from the upper side of the main side plate 22a. The main side frame 22A is composed of the upright 4 attached to the rear outer surface of the main side plate 24A via the reinforcing housing 22d and the upper surface flange 22c and the common outer plate 27. The outer plate 27 is bent at the rear portion. Thus, a back plate 27a is formed.

  The upright 4 includes an outer plate 27 common to the side wall 22, a rear plate 27 b formed by bending the rear portion of the outer plate 27 inward, an upper surface flange 22 c and a reinforcing housing in parallel to the outer plate 25. The inner plate 4a is erected on the body 22d and connected to the outer plate 27 via a back plate 27b and a reinforcing member 4b.

  The outer plate 27 is formed by integrally forming an outer surface and a rear surface of a single thick steel plate that is several millimeters thicker than a normal frame material by machining such as cutting, pressing, bending, and drilling. 22 and the upright 4 are configured so as to have an integral structure, and a curved decorative groove 27c that is partitioned in design is formed on the outer plate 27 between the side wall 22 and the upright 4.

  The side walls 22 and the back plates 27a and 27b of the upright 4 are formed with notches corresponding to the boundary between the bonnet 32 and the tail gate 31. A cross-section tie bar mounting jig 33 is fixed by welding. A tie bar 34 is detachably mounted between the left and right tie bar mounting jigs 33 via a fixing bolt (fixing tool) 36. A travel indicator 37 made up of a direction indicator lamp, a stop lamp, and the like is attached to the opening of the tie bar mounting jig 33. A door catch 38 for fixing the bonnet 32 in the closed position is attached to the inner surface of the central portion of the tie bar 34.

According to the above-described configuration, the upright mounting structure that is conventionally erected and fixed independently on the main frame is formed by forming the side wall 22 and the upright 4 constituting the main frame 21 with a single thick steel plate. Since the outer plate 27 has an integrated structure and the rear plate 27a and 27b are integrally formed by bending the rear side portion of the outer plate 27 by 90 °, the strength of the side wall 22 and the upright 4 is remarkably improved. Can be made. Further, the back plate 27a, 27b of the outer plate 27 is partly cut out, the tie bar mounting jig 33 is mounted, and the tie bar 34 is connected between the left and right side walls 22 and the upright 4, thereby further improving the structural strength. Can be made. Therefore, the heavy work load applied to the upright 4 via the work boom 6 can be more effectively supported by the tie bar 34 and the cross member 25.

Further, at the time of maintenance, by opening the tail gate 31 and the bonnet 32, and further removing the fixing bolt 36 and removing the tie bar 34 , the rear surface and the rear upper surface of the engine compartment 20 can be continuously opened. R and the radiator fan RF can be easily attached and detached in a short time, and maintainability is not impaired.

It is a back perspective view of a body frame showing an embodiment of a body frame of a working vehicle according to the present invention. It is a front perspective view of the vehicle body frame. It is a side view of the vehicle body frame. It is AA sectional drawing shown in FIG. It is a rear view which shows the side wall of the same vehicle body frame. It is a back perspective view of the vehicle for the work. It is a side view of the working vehicle. It is a side view which shows the working state of the working vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body 2 Driver's seat 4 Upright 5 Work boom 6 Main horizontal support shaft 8 Bucket 9 Boom elevating cylinder 12A Front wheel 12B Rear wheel 20 Engine room 21 Main frame 22 Side wall 23 Bottom frame 24 Front frame 25 Cross member 27 Outer plate 27a back plate 27b rear plate 27c decorative groove 31 tailgate 32 bonnet 33 data Iba mounting jig
34 Tie bar 36 Fixing bolt 37 Travel indicator 38 Door catch

Claims (2)

A driver's seat is disposed at the front of the vehicle body, and a pair of left and right work booms are disposed so as to extend forward from both sides of the rear of the vehicle body through both sides of the driver's seat, and a work tool is disposed at the front of the work boom. A vehicle body frame of a working vehicle provided,
A main frame having left and right side walls connected to each other via a connecting member and supporting the driver's seat at the front and having an engine compartment formed at the rear;
A boom support portion provided at a rear upper portion of the side wall and configured to swingably support a fixed end of the work boom via a horizontal support shaft in a vehicle body width direction;
A rear opening / closing door that is freely opened and closed between the left and right side walls at the rear of the engine compartment;
An upper opening door that is openably and closably attached between the left and right side walls at the rear upper part of the engine compartment,
A vehicle body frame for a working vehicle, wherein a tie bar is connected between the rear opening / closing door and the upper opening / closing door between the left and right side walls, and the tie bar and the side wall are detachable via a fixture. The side wall outer plate and the back plate and the boom support portion outer plate and the back plate are processed into a single thick plate to form the side wall and the boom support portion as an integral structure.
The vehicle body frame for a working vehicle according to claim 1, wherein a part of the outer plate between the rear plates is cut out and a tie bar mounting jig for mounting a tie bar is attached.

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