JP7074619B2 - Work vehicle - Google Patents

Description

The present invention relates to a work vehicle having a resin front grill.

Patent Document 1 is provided with a bonnet, the bonnet is composed of a front grill that covers the front of the engine room and a main cover that covers the upper side and both sides of the engine room, and the front grill made of resin is integrally molded. The work vehicle described in the above is conventionally known.

According to the work vehicle of Patent Document 1, the curved portion of the front portion of the bonnet, the light support portion that supports the headlight attached to the front grille, and the like can be integrally molded from the resin material, and therefore, when manufactured. The labor and cost can be greatly reduced.

However, the bonnet is provided with a front cover on the lower side of the front grill, which improves the strength around the front grill and is gripped when the bonnet is swung upward. Since the installation position is low and there is no protrusion for the operator to handle, there is a problem that it may be difficult for the operator to grasp the bonnet when opening and closing the bonnet.

Japanese Patent No. 4388397

An object of the present invention is to provide a work vehicle provided with a resin-molded front grill, which can more smoothly open and close the bonnet while ensuring the strength of the front grill.

In order to solve the above problems, the present invention first includes a bonnet, which comprises a front grille covering the front of the engine room and a main cover covering the upper side and both sides of the engine room, respectively. The front grille has a resin grille frame and a resin grille body that covers the front of the engine room, and the grille body has a body-side protrusion formed so as to project forward. Is formed, and in the portion that wraps with the main body side protrusion in the front view of the grill frame, a frame side protrusion that protrudes forward and a frame side recess formed on the back side of the frame side protrusion are formed. The grill body and the grill frame are formed so that the grill body and the grill frame are overlapped in the front-rear direction by fitting the protrusion on the body side into the recess on the frame side. The protruding portion and the frame-side protruding portion are configured to be detachably configured by an engaging portion provided on one side and an engaging hole provided on the other side to engage the engaging portion, and the engaging portion is formed. The portion and the engaging hole are arranged on the lower side of the main body side protruding portion and the frame side protruding portion, and are characterized in that they are formed in a V shape when viewed from the front .

The bonnet is projected forward by the main body-side protrusion and the frame-side protrusion to the front grille that covers the front side of the engine room to form a protrusion that can be grasped by the operator. However, the opening and closing operation of the bonnet can be performed more smoothly. At this time, the protrusion is configured so that the resin-molded protrusion on the main body side of the grill body and the resin-molded recess on the frame side on the grill frame side are overlapped with each other in the front-rear direction. Therefore, it is formed with high strength and low cost.

Further, the main body-side protrusion and the frame-side protrusion are detachably configured by an engagement portion provided on one side and an engagement hole provided on the other side to which the engagement portion is engaged. According to the above, the position of the grill body and the grill frame is facilitated, so that the assemblability of the front grill is improved.

The engaging portion and the engaging hole are arranged on the lower side of the main body side protruding portion and the frame side protruding portion, and according to the one formed in a V shape when viewed from the front, the operator can: When the bonnet is swung upward, it becomes easier to grip the lower side of the protruding portion by the grill body and the grill frame, and the strength of the front grill made of a combination of resin members is also improved.

It is a side view of the agricultural tractor to which the work vehicle of this invention was applied. It is a main part perspective view which showed the front side of the work vehicle. It is an exploded side view which showed the structure of a bonnet. It is an exploded perspective view which showed the structure of a bonnet. It is sectional drawing of the main part which showed the connection mode of the front grill 22. (A) and (B), a perspective view and a rear view showing a front grill. (A) to (C) are a plan view, a front view, and a side view showing the grill main body. (A) to (D) are a perspective view, a plan view, a side view, and a front view showing a grill frame.

Hereinafter, embodiments of the present invention will be described with reference to the illustrated examples. FIG. 1 is a side view of an agricultural tractor to which the work vehicle of the present invention is applied, and FIG. 2 is a perspective view of a main part showing the front side of the work vehicle. This tractor includes an airframe frame 3 supported by a pair of left and right front wheels 1, 1 and rear wheels 2, 2, and a bonnet 4 covering an engine room in which an engine (not shown) or the like is installed on the front side of the airframe frame 3. A traveling machine body 7 is configured by providing a control unit 6 arranged behind the bonnet 4 and operated by an operator, and work such as a rotary tillage device is provided behind the traveling machine body 7 via an elevating link 8. The machine (not shown) is connected so that it can be raised and lowered.

The control unit 6 is a floor on which an operator sits a seat 9, a steering handle 11 which is a steering wheel arranged in front of the seat 9, and a floor surface provided between the seat 9 and the steering handle 11. A step 12 and an auxiliary step 13 arranged on both the left and right sides of the floor step 12 to assist the operator in getting into the control unit 6 are provided.

A safety frame 14 bent into an inverted U shape in front view is installed on the rear side of the seat 9, and the safety frame 14 straddles the rear end portion of the control unit 6 to the left and right. It is mounted and fixed to the traveling machine body 7 side in a state of being erected from one left and right side of the 7 to the other side.

The bonnet 4 is formed so as to cover the front surface, the upper side, and the left and right side sides of the engine room, and can swing up and down with a fulcrum axis in the left-right direction provided on the upper surface side of the rear end of the bonnet 4 as a fulcrum. Therefore, it is supported on the intake cover 16 side of the traveling machine body 7. By swinging the bonnet 4 up and down, the engine room on the front side of the machine frame 3 on which the engine is mounted is opened and closed.

Next, a specific configuration of the bonnet will be described with reference to FIGS. 2 to 4. 3 and 4 are an exploded side view and an exploded perspective view showing the configuration of the bonnet.

From the illustrated example, the bonnet 4 is attached to a main cover 21 formed in an inverted U shape so as to cover the upper side and the left and right side of the engine 10 in the engine room, and to the front side of the main cover 21. It is composed of a front grill 22 that covers the space on the front side of the engine.

The main cover 21 is formed by bending a square plate-shaped iron plate into an inverted U shape, and the front end side of the main cover 21 is projected from the lower end side toward the front in a plan view. A U-shaped support frame 23 is provided. As a result, the main cover 21 is wide open so that the front grill 22 is fitted in the front view, and a grill opening is formed in which the lower end side protrudes forward in the side view (FIG. 3 and the like). reference).

According to the configuration, the main cover 21 constitutes a portion other than the front grill 22 at the front end of the bonnet 4, and the front and rear ends of the main cover 21 have a relatively simple shape, so that the main cover 21 has high strength. Can be easily molded at low cost.

Further, the main cover 21 and the support frame 23 are provided with mounting pins 24 for mounting and fixing the front cover 22 inside along the peripheral edge side of the grill opening (FIGS. 3 and 4 and the like). reference). Further, the peripheral edge side of the grill opening is formed with a recess formed in a crank shape inward, so that the connection surface with the rear end side of the front grill 22, which will be described later, becomes smooth. Has been done. Details will be described later.

Next, a specific configuration of the front grill will be described with reference to FIGS. 2 to 7. 5A and 5B are cross-sectional views of a main part showing a connection mode of the front grille 22, FIGS. 6A and 6B are perspective views and a rear view showing the front grille, and FIGS. 7A to 7B are shown. (C) is a plan view, a front view, and a side view showing the grill main body, and FIGS. 8 (A) to 8 (D) are a perspective view, a plan view, a side view, and a front view showing the grill frame. ..

The front grill 22 has a resin grill body 26 attached so as to cover the grill opening of the main cover 21, and a resin grill frame formed in a frame shape along the grill opening of the main cover 21. 27 and resin reinforcing frames (grill frames) 28 and 28 provided between the grill body 26 and the grill frame 27 are provided, and the front grill 22 has the grill frame 27 and the reinforcing frame 28 from the front. , The grill main body 26 is stacked in the front-rear direction.

The grill body 26 is a resin member integrally molded in a dish shape that bulges forward so as to cover the entire grill opening, in other words, in a U shape in a plan view, and is an engine during forward traveling. A ventilation section 31 for sending wind into the room, a headlight support section 32 on which the headlight 20 is supported, and a logo support section 33 on which a removable logo (emblem) is supported on the front of the front grill 22. A frame portion (step portion) 34 extending in the left-right direction is provided, and the grill body 26 is mounted and fixed to the mounting pins 24 provided on the peripheral edge side of the grill opening at predetermined intervals on the outer edge side. A mounting portion 36 is provided.

The ventilation portion 31 is formed over the entire lower side of the grill body 26 by forming a large number of ventilation holes. Further, the left and right ends of the ventilation portion 31 are curved rearward along the shape of the grill body 26, and curved support portions 35 and 35 in which ventilation holes are not formed are formed in the curved portion of the ventilation portion 31. It is provided (see FIGS. 2 to 7).

According to this configuration, the ventilation hole is not formed in the curved support portion 35, which requires higher strength than the grill main body 26, so that the strength of the grill main body 26 (front grill 22) can be sufficiently secured.

The light support portion 32 is arranged side by side on the upper side of the ventilation portion 31, and the tubular headlight 20 is fitted from the back side of the grill body 26 so that only the light portion is the front cover. It is formed in a tubular shape so that the headlight 20 can be held in a state of being exposed on the surface of the 22. Further, a light fixing portion 37 for mounting and fixing the headlight 20 with a fixing screw or the like is provided on the inner peripheral edge of the light support portion 32 (see FIG. 6B). As a result, a plurality of headlights 20 are configured to be symmetrically supported on the upper side of the grill body 26.

In the illustrated example, the light support portion 32 has a first light support portion 32A located on the upper side of the ventilation portion 31 and on the left and right outer sides of the logo support portion 33, and above the left and right outer sides of the first light support portion. The second light support portion 32B arranged side by side so as to be inclined, and the third light support portion 32C provided directly below the second light support portion 32B and arranged so as to sandwich the frame portion 33, respectively. It is provided symmetrically when viewed from the front (see FIG. 6 and the like).

At this time, the third light support portion 32C is provided on the ventilation portion 31 side on the lower side of the frame portion 34, and extends from the upper side of the curved support portion 35 toward the rear side in the front-rear direction (FIG. 2). , FIG. 6 (A), FIG. 7, etc.).

According to the configuration, in the ventilation portion 31 of the grill main body 26, the curved support portion 35 in which the ventilation holes are not formed and the third light support portion 32C are provided at the portions curved toward the rear on both the left and right sides. By providing the above, the strength of the grill body 26 (front grill 22) can be kept higher while ensuring the amount of air supplied to the engine room.

The frame portion 34 is a left-right V-shaped frame arranged vertically on the upper side of the ventilation portion 31 so as to vertically sandwich the first light support portion 32A and the second light support portion 32B. It is composed of steps that bulge toward the front. Further, particularly on the left and right center sides of the lower frame portion 34, a V-shaped main body side projecting portion 39 projecting further forward is formed. The reinforcing frame 28 is configured to be attached to the frame portion 34. Specifically, it will be described later.

The logo support portion 33 is a support surface formed so as to support a logo (emblem) on the left-right center side of the frame portion 34, in other words, directly above the main body side protrusion 39, and supports the logo. The portion 33 is provided with a logo support hole 33a for attaching and detaching the logo. Further, the logo support portion 33 has a ventilation hole similar to that of the ventilation portion 31 formed around the logo support hole 33a (see FIGS. 6 and 7 and the like).

According to the configuration, the logo (emblem) attached and fixed to the front surface of the front grill 22 can be detachably supported, so that the design of the logo can be easily changed. Further, since the ventilation hole is formed on the logo support portion 33, the air flow rate flowing into the engine room from the front of the bonnet 4 can be increased, and the cooling efficiency in the engine room can be further improved.

The grill frame 27 has a large opening near the lower center so that the ventilation portion 31 and the light support portion 32 on the grill body 26 side are exposed when viewed from the front, and the top plate portion of the front grill 22 is formed. To expose the plate portion 41, the frame-side protrusion 42 that covers the main body-side protrusion 39 from the front side, and the logo support portion arranged between the frame-side protrusion 42 and the top plate portion 41. The logo opening 43 is integrally molded. Further, the outer peripheral edge side thereof is configured so that the grill frame 27 and the main cover 21 are smoothly connected by being locked to the recess 15 on the grill opening side of the main cover 21.

The top plate portion 41 covers the upper surface side of the grill opening and is provided with a cylindrical fixing hole on the lower surface side thereof for screwing to the fixing portion provided on the upper end side of the grill body 26. ..

The frame-side protrusion 42 is formed so as to project forward from the front end of the top plate 41 and the logo opening 43 in a side view, and is formed in a V shape so as to cover the main body-side protrusion 39 from the front side. Has been done. Further, on the back surface side of the frame-side protrusion 42, a frame-side recess recessed along the shape of the frame-side protrusion 42 is formed. Further, a main body side locking hole (engagement hole) formed on the lower end side of the frame side protruding portion 42 so as to project rearward and formed on the lower side of the main body side protruding portion 39 on the grill main body 26 side. ) 40 is provided with a frame-side locking piece (engagement portion) 44 to be inserted (see FIG. 8C and the like).

At this time, the frame-side locking piece 44 and the main body-side locking hole 40 are both V-shaped in front view along the lower end side of the V-shaped out-of-frame protruding portion 42 and the main body-side protruding portion 39, respectively. (See FIGS. 6 to 8).

According to this configuration, the alignment between the main body-side protrusion 39 (main body-side locking hole 40) and the frame-side recess 42 (frame-side locking piece 44) that are overlapped in the front-rear direction becomes smooth and easy. Further, by fitting the protruding portion 39 on the main body side into the concave portion 42 on the frame side, the protruding portion at the center of the front grill becomes stronger. Further, the main body-side protruding portion 39 and the frame-side protruding portion 42 that are overlapped in the front-rear direction also function as V-shaped grip portions 39, 42 that protrude forward in the center of the front grill 22, and thus the grip portion. By performing the opening / closing operation of the bonnet 4 with 39 and 42, the opening / closing operation of the bonnet 4 can be performed more smoothly and easily.

The reinforcing frame 28 extends in the left-right direction along the frame portion 34, is inclined upward in the left-right direction in front view, and its left-right end side is rearward along the shape of the grill body 26. It is a pair of left and right reinforcing members that are bent and molded. The reinforcing frame 28 has a reinforcing mounting piece (mounting piece) 46 for mounting and fixing to the grill body 26 side, and a groove portion 51 for positioning the grill frame, and the lower frame portion 34. Of these, the portion other than the main body side protruding portion 39 is configured to cover from the front.

The reinforcing mounting piece 46 is formed in a columnar shape having ribs along the extending direction. Correspondingly, a reinforcing mounting hole (mounting hole) 47 having a groove formed in a columnar hole is formed on the lower frame portion 34 side so that the reinforcing mounting piece 46 can be inserted. (See Fig. 4 and Fig. 7 etc.).

According to the configuration, positioning when the reinforcing frame 28 is attached to the grill body 26 (frame portion 34) side is facilitated, and the reinforcing frame 28 is not rattled and is more firmly on the grill body 26 (frame portion 34) side. Can be mounted and fixed to.

The groove 51 is formed on the left and right ends of the reinforcing frame 28 extending in the left-right direction, and is a claw formed on the peripheral edge side of the grill frame 27 fitted to the end side of the reinforcing frame 28. The portions 52 are configured to engage (see FIG. 5).

According to the configuration, when the grill frame 27 is attached to the grill main body 26 to which the reinforcing frame 28 is attached from the front side, the grill frame 27 can be smoothly positioned at a position where the grill frame 27 is attached and fixed.

According to the reinforcing frames 28, 28 having the above configuration, the left and right sides of the V-shaped grip portions 39, 42 can be reinforced along the frame portions 34. At this time, since the left and right end sides of the reinforcing frame 28 are bent rearward along the frame portion 34, the curved grill body 26 can be reinforced more efficiently.

As a result, the front grill 22 can maintain high strength of the frame portion extending in a V shape from the grip portions 39, 42 located on the center side of the front view, so that the grip portions 39, 42 can be provided. When the bonnet 4 is opened and closed by gripping it, the front grill 22 can be smoothly opened and closed without bending.

With the above configuration, the front grill 22 first inserts the reinforcing mounting piece 46 on the reinforcing frame 28 side into the reinforcing mounting hole 47 on the frame portion 34 side, so that the reinforcing frame 28 becomes the grill main body 26. The grill frame 27 is attached and fixed to the grill main body 26 side by inserting and fixing the frame side locking piece s to the main body side locking hole 40 after being attached and fixed to the (frame portion 34) side. It is composed of.

Thereby, the positioning when the reinforcing frame 28 is attached to the grill main body 26 (frame portion 34) side and the positioning when the grill frame is attached to the grill main body 26 side can be smoothly and easily performed.

Further, the front grill 22 having the configuration is detachably attached to the front end side of the main cover 21 by attaching and fixing the attachment portion 36 on the grill body 26 side to the attachment pin 24 on the peripheral side of the grill opening. Can be fixed.

At this time, the rear end side of the front grill 22 is locked to the recess formed on the peripheral edge side of the grill opening so that the front grill 22 and the main cover 21 are smoothly connected to each other. (See Fig. 5 etc.).

According to the above configuration, the front grill 22 is made entirely of resin by connecting the grill main body 26, the pair of reinforcing frames 28, 28, and the grill frame 27 in the front-rear direction. Despite being composed of only the members, it is possible to obtain sufficient strength to withstand the impact during the opening / closing operation of the bonnet 4.

This eliminates the need to provide a metal member for reinforcement on the front grill 22 molded of resin, so that the front grill 22 can be configured at a lower cost and the air can be supplied into the engine room during forward traveling. The ventilation portion 31 can also be formed larger. Further, since all the members constituting the front grill 22 are molded of resin, the manufacturing cost can be kept low.

4 Bonnet 20 Headlight 21 Main cover 22 Front grill 26 Grill body 27 Grill frame 39 Body side protrusion 40 Body side locking hole (engagement hole)
42 Frame side protrusion 44 Frame side locking piece (engagement part)

Claims (1)

Equipped with a bonnet
The bonnet is composed of a front grill that covers the front of the engine room and a main cover that covers the upper part and both sides of the engine room, respectively.
The front grill has a resin grill frame and a resin grill body that covers the front of the engine room.
The grill body is formed with a body-side protrusion formed so as to protrude toward the front.
A frame-side protrusion that protrudes forward and a frame-side recess that is formed on the back side of the frame-side protrusion are formed in a portion that wraps with the main body-side protrusion in the front view of the grill frame.
The grill body and the grill frame are configured by overlapping the grill body and the grill frame in the front-rear direction by fitting the protrusion on the body side into the recess on the frame side.
The main body-side protrusion and the frame-side protrusion are detachably configured by an engagement portion provided on one side and an engagement hole provided on the other side to which the engagement portion is engaged.
The engaging portion and the engaging hole are arranged on the lower side of the main body side protruding portion and the frame side protruding portion, and are formed in a V shape when viewed from the front.
Work vehicle.

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