JP2007015472A - Safety frame for working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accomplish a constitution capable of accomplishing cost reduction and enhancement of accuracy while having sufficient strength and easily performing assembling. <P>SOLUTION: The safety frame 20 has a frame body 10 formed to a gate shape so as to be laid on a fender 7; and a lower frame 11 for supporting the frame body 10 on a machine body 4. Respective left and right lower ends of the frame body 10 are connected to the lower frame 11 at a position of the fender 7. Further, the left and right lower ends of the lower frame 11 are connected to a rear axle case 25 through a bracket 17 or the like respectively. Further, the left and right lower frames 11 are connected to each other by a connection member 12. A plate-like member is bent at left and right side ends using press working to form an edge part 28 and to make a rib structure. An upper end is inwardly bent to form a bent part 27 and a member becoming a bonding part 15 is integrally fixed to a lower inner surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a safety frame for a work vehicle represented by a tractor.

Conventionally, work vehicles such as tractors have a safety frame for protecting an operator when the work vehicle falls. This safety frame has a frame main body formed in a gate shape so as to cross the left and right rear fenders at the rear of the driver's seat, and further, a lower frame and a reinforcing member are attached to the rear portion to reinforce the frame main body. There have been proposed ones that are fixed to a fender and a rear axle case (see, for example, Patent Document 1) and those that have strength obtained by welding another member to the member of the lower frame itself without a reinforcing member.
JP 9-315244 A

  However, it is necessary to obtain sufficient strength by attaching a reinforcing member to the safety frame as described above or welding another member without attaching the reinforcing member. In particular, the method of welding another member as described above has problems such as high cost and defective accuracy due to welding distortion.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a safety frame for a work vehicle that has sufficient strength and can be easily assembled, while being able to reduce costs and improve accuracy.

The present invention according to claim 1 (see, for example, FIG. 1 to FIG. 7) includes a frame body (10) formed in a gate shape so as to span the left and right rear fenders (7) at the rear of the driver's seat (6); In a safety frame (20) of a working vehicle (1) having a lower frame (11) connected to both ends of the frame body (10) and fixed to an airframe (25),
The lower frame (11) is formed by bending the left and right side end portions of the plate-like member inward to form an edge portion (28), and the upper end portion thereof is bent inward. A curved portion (27) is formed, and a coupling portion (15) is integrally fixed to the lower inner surface of the plate-like member;
The plate-like member of the lower frame (11) has the edge portion (28) projecting toward the tire side and disposed along the inner side surface of the rear fender (7), and the bent portion (27) is disposed on the rear portion. The fender (7) is connected to the end of the frame body (10), and the coupling part (15) is fixed to the airframe (25).
The safety frame (20) of the working vehicle (1) is characterized by the above.

In the invention according to claim 2, the coupling portion (15) of the lower frame (11) is fixed to a bracket (17) integrated with the airframe (25) via a vibration isolating rubber (14),
When the safety frame (20) is bent in the longitudinal direction of the body by an external force, an edge (28) of the lower frame (11) is in contact with the bracket (17).
A safety frame (20) of the working vehicle (1) according to claim 1.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of invention easy, and has no influence on the structure of a claim. It is not a thing.

  According to the first aspect of the present invention, since the safety frame is constituted by the frame main body and the press-formed lower frame, the lower frame is made of a plate-shaped member while being robust and easy to assemble. Since the edges are formed by bending the end portions on both sides, it has sufficient strength and can be reduced in cost as compared with a rib structure formed by welding another member. The generation of distortion can be suppressed and the accuracy can be improved.

  Further, the plate-like member constituting the lower frame forms an edge over the entire length of both side end faces, and the edge protrudes toward the tire side, so that the edge removes mud etc. of the tire. Since the edge portion is formed by pressing and has a rounded portion, mud adhesion is also small.

  According to the second aspect of the present invention, since the safety frame is attached via the anti-vibration rubber, the vibration of the engine or the like is not directly transmitted to the safety frame, and the safety frame generates noise such as chatter noise. When a large external force is generated in the safety frame, the lower end of the lower frame bent in an L shape by the edge abuts the bracket and prevents the safety frame from being greatly deformed. The function of can be improved.

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

  As shown in FIG. 1, the work vehicle 1 has a body 4 supported by front wheels 2 and rear wheels 3. An engine (not shown) is mounted in the front bonnet of the body 4, and a driving operation unit 5 is disposed behind the bonnet. In the driving operation unit 5, an operation unit such as a steering wheel 8 is disposed at the rear of the bonnet, and a seat seat 6 is disposed behind the steering wheel 8. Further, fenders 7 are disposed on both sides of the seat 6 and the upper part of the rear wheel 3 is covered with the fenders 7. As shown in FIG. 2, a mission case 23 constituting the fuselage is disposed below the seat 6, and rear axle cases 25 are disposed on the left and right sides of the mission case 23. Yes. The rear axle case 25 rotatably supports an axle that can fix the rear wheel 3.

  On the other hand, a work machine (for example, a rotary tilling unit) can be attached to the rear portion of the work vehicle 1 via a lifting link mechanism. The lifting / lowering link mechanism is suspended and supported by the lift arm 9, and the lift arm 9 is rotated up and down by an extension / contraction operation of a lift cylinder disposed on the base side thereof. Therefore, it is possible to raise / lower the work machine by hydraulically driving the lift cylinder.

  As shown in FIGS. 2, 3, and 4, a safety frame 20 that protects the operator when the tractor falls is disposed at the rear of the seat 6. The safety frame 20 includes a gate-shaped frame main body 10 extending substantially over the height of the operator's head, and a lower frame 11 that supports the frame main body 10 on the body 4. At the lower left and right ends of the frame body 10, connecting fittings 30, 30 are integrally fixed at the position of the fender 7, and the connecting fitting 30 is connected to a support 31 fixed to the lower frame 11. ing. Further, the lower end of the lower frame 11 is connected to the left and right rear axle cases 25 via brackets 17 and the like. The left and right lower frames 11 and 11 are connected to each other by a connecting member 12. The connecting member 12 is fixed to the upper part of the mission case 23 by bolts 13 and is also fixed to the airframe behind the seat 6. As a result, the safety frame 20 is robust and can be easily assembled.

  As shown in FIGS. 3, 4, and 5, the connection fitting 30 is a U-shaped member in plan view, is fixed to the support tool 31, and is fitted to the lower portion of the frame body 10. The connecting fitting 30 fixes the frame main body 10 with bolts 32 and pins 33, and when the pins 33 are removed, the frame main body 10 can be tilted backward, and the tilted state with the pins 33 can be maintained. . As a result, the frame body 10 can be tilted during storage.

  As shown in FIG. 5, the coupling portion 15 of the lower frame 11 is fixed to the bracket 17 via a vibration isolating rubber 14 with bolts. At this time, the lower end of the lower frame 11 and the bracket 17 are fixed to each other with a slight gap therebetween. Thereby, vibrations of the engine or the like are not transmitted to the safety frame 20, and the safety frame 20 can be prevented from generating noise such as chatter noise. It is possible to prevent the lower end of the lower frame 11 bent into a shape from coming into contact with the bracket 17 and greatly deforming the safety frame 20.

  As shown in FIGS. 6 and 7, the lower frame 11 is formed by pressing a rectangular and plate-like member, and the right and left side ends thereof have rounded portions on the outside over the entire length in the longitudinal direction. An edge portion 28 that is bent in an L shape is formed, and a bent portion 27 is formed in which the upper end portion is bent inward. A hole 35 for fixing the support tool 31 is formed in the bent portion 27, and a hole 36 for fixing the connecting member 12 is provided in the main body portion 11a. On the inner surface of the lower portion, a member that becomes the coupling portion 15 is integrally fixed by welding, and the coupling portion 15 is provided with a hole 37 for fixing to the bracket 17 via the vibration isolating rubber 14. As a result, the lower frame 11 is bent at both end portions of the plate-like member to form the edge portion 28 to form a rib structure. Compared to the structure and the like, the cost can be reduced, and the occurrence of distortion due to welding can be suppressed to improve the accuracy. Further, when the lower frame 11 is disposed, the edge portion 28 described above is protruded toward the tire side so as to be along the inner side surface of the fender 7. Thereby, it becomes possible to drop the mud etc. adhering to the rear wheel 3, and since the round portion is provided, mud adhesion can be reduced.

  As described above, according to the working vehicle 1 according to the embodiment of the present invention, the safety frame 20 is constituted by the frame main body 10 and the press-formed lower frame 11, so that it is robust and can be easily assembled. However, since the lower frame 11 has the edge portion 28 formed by bending both end portions of the plate-like member, the lower frame 11 has sufficient strength and has a rib structure by welding another member. In addition, the cost can be reduced, and the occurrence of distortion due to welding can be suppressed to improve accuracy.

  Further, since the plate-like member constituting the lower frame 11 forms the edge portion 28 over the entire length of both side end faces, and the edge portion 28 is disposed so as to protrude toward the tire side, the edge portion is tire mud or the like. Since the edge portion 28 is formed by pressing and has a rounded portion, there is little adhesion of mud.

  In addition, since the safety frame 20 is attached via the anti-vibration rubber 14, vibrations of the engine and the like are not directly transmitted to the safety frame 20, and the safety frame 20 can be prevented from generating noise such as chatter noise. At the same time, when a large external force is generated in the safety frame 20, the lower end of the lower frame 11 bent in an L shape by the edge portion 28 abuts against the bracket 17, thereby preventing the safety frame 20 from being greatly deformed. The function as 20 can be improved.

  In the present embodiment, the lower frame is fixed to the rear axle case 25 by the bracket 17, but the bracket may be fixed to the transmission case 23 in an appropriate shape.

The side view of the working vehicle equipped with the safety frame concerning the present invention. The rear view of the working vehicle equipped with the safety frame concerning the present invention. The side view of the safety frame attaching part of a work vehicle rear part. The rear view of the safety frame concerning the present invention. The side view of the safety frame concerning the present invention. The perspective view of a lower frame single-piece | unit. It is a figure which shows a lower frame single-piece | unit, (a) is a side view, (b) is a front view, (c) is an upper view, (d) is an AA cross-section arrow sectional view of (b).

Explanation of symbols

1 Working vehicle 6 Driver's seat (seat seat)
7 Fender 10 Frame body 11 Lower frame 14 Anti-vibration rubber 15 Joint 17 Bracket 20 Safety frame 25 Airframe (rear axle case)
27 Folding part 28 Edge

Claims (2)

A safety frame for a working vehicle having a frame body formed in a gate shape so as to span the left and right rear fenders at the rear of the driver's seat, and a lower frame connected to both ends of the frame body and fixed to the fuselage In
The lower frame is formed by bending the left and right side end portions of the plate-shaped member inward by pressing, and forming the bent portion by bending the upper end portion thereof inward. And the fixed part is integrally fixed to the lower inner surface of the plate-shaped member,
The plate member of the lower frame is arranged along the inner surface of the rear fender with the edge projecting toward the tire side, and the bent portion is connected to the end of the frame body at the rear fender portion. And fixing the joint to the fuselage,
A safety frame for a working vehicle. The joint portion of the lower frame is fixed to a bracket integrated with the airframe via a vibration isolating rubber,
When the safety frame is bent in the longitudinal direction by external force, the edge of the lower frame is in contact with the bracket.
A safety frame for a working vehicle according to claim 1.

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