JP2007245749A - Frame structure of working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce manufacturing cost, and improve productivity and fuel economy by rationalizing a frame structure. <P>SOLUTION: A vehicle body frame 1 is constituted by welding a cabin frame 19 framed in a box shape to a base frame 18. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a frame structure of a work vehicle including a cabin frame.

As the frame structure of the work vehicle as described above, for example, a cabin frame is bolt-connected to a vehicle body frame (see, for example, Patent Document 1), or a driving cabin is mounted and supported via a vibration isolation connecting portion at the rear of the body body (For example, refer to Patent Document 2).
JP 2001-191958 (paragraph number 0027, paragraph number 0029, FIGS. 1 and 7) JP 2006-36073 A (paragraph number 0013, FIG. 1, FIG. 2, FIG. 5)

  In the above configuration, the cabin frame (driving cabin) has high strength to protect the passenger, and the body frame (airframe body) has high strength to allow the cabin frame to be equipped. As it has, it is necessary to equip them with an original intensity | strength member and a reinforcement member, and to make them high intensity | strength. Therefore, the number of components of the frame increases, the frame structure becomes complicated, and the weight of the entire work vehicle becomes heavy. As a result, the manufacturing cost increases, and the productivity and fuel consumption decrease.

  An object of the present invention is to reduce the manufacturing cost and improve the productivity and fuel consumption by rationalizing the frame structure.

  In order to achieve the above object, in the first aspect of the present invention, the vehicle body frame is configured by welding a cabin frame framed in a box shape to the base frame.

  According to this configuration, the vehicle body frame has a welded integrated structure of the base frame and the cabin frame, whereby the cabin frame configured to have high strength to protect the passenger functions as a strength member of the vehicle body frame. Will do.

  In other words, rationalization of the frame structure in which the body frame is configured by effectively using the cabin frame having higher strength than originally provided, without providing the body frame with a strength member or a reinforcing member for enabling the installation of the cabin frame. As a result, the structural components of the frame can be reduced while ensuring high strength as the body frame.

  Therefore, the frame structure can be simplified and the weight of the work vehicle as a whole can be reduced, and the manufacturing cost can be reduced and the productivity and fuel consumption can be improved.

  According to a second aspect of the present invention, in the first aspect, the left and right side frames formed in a loop shape are connected by a plurality of cross members to constitute the cabin frame. .

  According to this configuration, the left and right side frames are formed in a loop shape, so that the external force applied to the cabin frame is easily absorbed and dispersed in the side frame, and the cabin frame is deformed or damaged due to local stress concentration. Can be prevented.

  Therefore, by rationalizing the frame structure, it is possible to prevent deformation or breakage of the cabin frame due to local stress concentration while reducing manufacturing costs and improving productivity and fuel consumption.

  According to a third aspect of the present invention, in the invention according to the second aspect, a pipe material is employed for the side frame.

  According to this configuration, the side frame can be configured to be lightweight and have high strength while narrowing the frame width of the side frame, compared with the case where a sheet metal material is used for the side frame, and visibility and openness are improved. The feeling can be improved.

  Therefore, in addition to the reduction of manufacturing cost and the improvement of productivity and fuel consumption by rationalizing the frame structure, it is possible to improve the drivability and the comfortability.

  In the invention described in claim 4 of the present invention, in the invention described in claim 3 above, a deformed pipe having a straight recess formed over the entire length is adopted as the pipe material.

  According to this configuration, for example, if the side frame is formed by a deformed pipe so that the concave portion becomes the outer inner peripheral edge portion of the side frame, the concave portion can be used as a door receiver when the side frame is provided with an outward-opening door. It can be used effectively on the surface.

  That is, by forming the side frame with the deformed pipe, the side frame can be provided with the door receiving surface without requiring the trouble of forming the door receiving surface.

  In addition, by forming the door receiving surface in the recess instead of the lateral outer surface of the side frame, in the closed state in which the door is bonded to the door receiving surface, the junction between the door and the door receiving surface is hidden by the side frame. As a result, inflow of rainwater, dust, and the like from the joint can be more effectively suppressed, and aerodynamic characteristics and appearance can be improved.

  Therefore, productivity, comfort, and fuel consumption can be improved more effectively, and the appearance can be improved.

  According to a fifth aspect of the present invention, in the invention according to any one of the second to fourth aspects, the side frame is formed of a single member.

  According to this configuration, the components of the side frame can be reduced, and the cost and labor required for forming the side frame can be reduced.

  Accordingly, it is possible to reduce manufacturing costs and improve productivity by simplifying the configuration.

  FIG. 1 shows an overall side surface of a work vehicle suitable for transportation and the like, and FIG. 2 shows an overall plan view thereof. The work vehicle is provided by an air-cooled engine 2 supported by vibration isolation on a body frame 1. The four-wheel drive type is configured to transmit power to a pair of left and right front wheels 5 and rear wheels 6 via a hydrostatic continuously variable transmission 3 or a gear transmission 4.

  The front part of the work vehicle is provided with a lower cover 7 also serving as a front wheel fender, an upper cover 8 with an upper left and right center opened, and a swingable bonnet 9 that covers the opening so as to be opened and closed. The storage space formed by them is equipped with an air conditioning unit 10 and the like.

  In the front and rear intermediate part of the work vehicle, a steering wheel 11 for steering the front wheels, a chaise longue type seat 12 supported so as to be detachable and the like are arranged to form a riding part 13 and a cabin that forms a boarding space 14 is deployed.

  At the rear of the work vehicle, the hydraulic dump cylinder 15 disposed above the gear type transmission 4 is actuated to swing up and down about a left and right support shaft 16 disposed at the rear end of the vehicle body frame 1. A loading platform 17 is provided.

  As shown in FIGS. 1 to 6, the vehicle body frame 1 is a welded integrated structure in which a base frame 18 and a cabin frame 19 are connected by welding, and is configured to have high strength for protecting a passenger. The cabin frame 19 is configured to function as a strength member of the vehicle body frame 1.

  The base frame 18 is formed by welding a pair of left and right side members 20, a cross member 21 having an L-shaped cross section, a cross member 22 having a U-shaped cross section, a support frame 23 for an air conditioning unit, and the like. The engine 2 and the gear-type transmission 4 are supported via a support frame 24 that is provided with an anti-vibration connection.

  A support frame 27 that supports the radiator 25, the oil cooler 26, and the like is welded to the left side portion of the engine 2 in the base frame 18, and a support that supports the fuel tank 28 is supported to the right side portion of the engine 2 in the base frame 18. The member 29 is welded.

  Each of the left and right side members 20 is formed in a crank shape in which the height position on the rear half side is higher than the height position on the front half side by welding a plurality of square pipe members. Further, a pair of front and rear U-shaped connecting members 30 are welded to the rear part of the front half side of each side member 20 so as to extend outward in the lateral direction of the vehicle body.

  As shown in FIGS. 1 and 2, the engine 2 has an output shaft (not shown) extending along the front-rear direction of the vehicle body, and the front side of the engine 2 overlaps with the cabin 14 in a side view. The gear type transmission 4 is directly connected to the rear end of the engine 2, and the hydrostatic continuously variable transmission 3 is connected to the rear end of the gear transmission 4.

  The cabin 14 is configured by including a seat 12, a roof panel 31, a front panel 32, a rear panel 33, a pair of left and right doors 34 that are open outward, and the like on the cabin frame 19.

  As shown in FIGS. 1 to 7, the cabin frame 19 includes a pair of left and right side frames 35 that form an entrance, a first cross member 36 that extends between the front portions thereof, and a second cross section that extends between the upper front portions of the left and right side frames 35. A cross member 37, a third cross member 38 extending between the front lower portions of the left and right side frames 35, a fourth cross member 39 extending between the rear upper portions of the left and right side frames 35, and a fifth cross member 40 extending between the back portions of the left and right side frames 35. The sixth cross member 41 extending between the bottoms of the left and right side frames 35, the pair of left and right seat support members 42 extending between the fifth cross member 40 and the sixth cross member 41, and the upper front portions of the left and right seat support members 42 Connecting member 43 and the fifth cross member 40 and the left and right seat supports Pair of handrail members 44 over member 42 Doo, by framework connected to the welding to the box-like etc. and is configured to have a high strength.

  As shown in FIGS. 4 to 7, a sheet metal cover 46 for closing the opening 45 formed between the left and right seat support members 42 is attached in a detachable manner. By removing it together with the seat 12 and opening the opening 45, it is possible to easily supply oil to the oil tank 47 disposed below the rear portion of the cabin 14.

  As shown in FIGS. 1 and 7, an air cleaner 48 is disposed below the right seat support member 42, and element replacement of the air cleaner 48 is a bolt that can be attached to and detached from the right side portion of the right seat support member 42. This can be done easily by removing the connected cover 49.

  As shown in FIGS. 1 to 6, each of the left and right side frames 35 has a small curvature in the front, rear, left and right so that a single deformed pipe 35 has a three-dimensional curve that can improve the appearance and aerodynamic characteristics. After performing a three-dimensional bending process that gently curves with a relatively small curvature, we weld both ends that are connected in a straight line in the vertical direction at the center of the rear part, and then grind and level the welded part to form a closed loop type. Is formed.

  In this way, if the left and right side frames 35 are formed in a closed loop shape having a three-dimensional curve capable of improving the appearance and aerodynamic characteristics, not only the appearance and aerodynamic characteristics can be improved, but also the cabin frame 19 Since the external force applied to the left and right side frames 35 is easily absorbed and dispersed, deformation and breakage of the cabin frame 19 due to local stress concentration can be effectively suppressed.

  In addition, since each side frame 35 is formed by a single deformed pipe 35, the side frame 35 is light and has high strength while improving visibility and openness by narrowing the frame width of the side frame 35. In addition, since the components of the side frame 35 can be reduced and the number of welding points and grinding points can be reduced, the manufacturing cost can be reduced and the productivity can be improved.

  As shown in FIGS. 3 to 12, the deformed pipe 35 has a pair of concave portions 35 </ b> A and 35 </ b> B that are recessed in a straight line over the entire length thereof, and is formed in a straight line on one of the non-recessed portions. The cross-sectional chamfered portion 35 </ b> C has a substantially bowl-shaped cross-section, and one concave portion 35 </ b> A forms the outer inner peripheral edge portion of the side frame 35, and the other concave portion 35 </ b> B becomes the inner outer peripheral edge portion of the side frame 35. Is bent so that the chamfered portion 35C forms the inner inner peripheral edge of the side frame 35.

  As a result, the outward circumferential surface portion 35 a formed on one side surface of the recess 35 </ b> A serving as the outer inner peripheral edge of each side frame 35 can be used as a door receiving surface 35 a that receives the left and right doors 34.

  An upward surface portion 35b formed on one side surface of the concave portion 35B serving as the inner peripheral edge of each side frame 35 can be used as a roof receiving surface 35b for receiving the roof panel 31 (see FIG. 9).

  A forward-facing surface portion 35c formed on one side surface of the recess 35B serving as the inner peripheral edge of each side frame 35 can be used as a front receiving surface 35c that receives the front panel 32 (see FIG. 8).

  A rear-facing surface portion 35d formed on one side surface of the concave portion 35B serving as the inner peripheral edge of each side frame 35 can be used as a rear receiving surface 35d for receiving the rear panel 33 (see FIG. 11).

  The downward portions 35e of the recesses 35B, which are the inner peripheral edges of the side frames 35, are engaged with the outer ends of the connecting members 30 welded to the left and right sides of the base frame 18, and the left and right sides of the base frame 18 and the cabin frame 19 are engaged. It can be used as a positioning portion 35e that determines the positional relationship in the direction to a predetermined connection position.

  That is, since each recessed part 35A, 35B of the deformed pipe 35 can be effectively used as the receiving surfaces 35a to 35d for the panels 31 to 33 and the left and right doors 34 or the positioning part 35e in the left and right direction with respect to the base frame 18, Productivity can be improved as compared with the case where the receiving surfaces 35a to 35d and the positioning portion 35e are separately formed.

  Further, since the peripheral portions of the panels 31 to 33 and the peripheral portions of the left and right doors 34 are hidden in the concave portions 35A and 35B of the deformed pipe 35, the appearance and aerodynamic characteristics can be improved. Inflow of rain water, high-pressure washing water, dust, or the like from the joints between the recesses 35A and 35B, the panels 31 to 33, and the doors 34 can be avoided more reliably.

  Moreover, by forming the inner inner peripheral edge of the side frame 35 with the chamfered portion 35C of the deformed pipe 35, the inner inner peripheral edge can be prevented from unnecessarily projecting inward of the cabin 14, and as a result It is possible to avoid the possibility of giving the passenger a feeling of pressure by the overhang of the inner peripheral edge.

  As shown in FIGS. 4 to 8, 10 and 11, each cross member 36 to 41 is made of a sheet metal material whose strength has been improved by performing drawing processing. It is possible to reduce the weight while securing high strength as 19.

  The first cross member 36 is processed so that the outer surface 36a at the top thereof is flush with the front receiving surfaces 35c of the left and right side frames 35 (see FIGS. 5 and 8).

  The second cross member 37 is processed so that the outer surface 37a of the front portion thereof is flush with the front receiving surfaces 35c of the left and right side frames 35 (see FIGS. 5 and 8).

  That is, the upper outer surface 36a of the first cross member 36 and the front outer surface 37a of the second cross member 37 can be used as a front receiving surface.

  The second cross member 37 is processed so that the outer surface 37b of the rear portion thereof is flush with the roof receiving surfaces 35b of the left and right side frames 35 (see FIGS. 5 and 10).

  The fourth cross member 39 is processed so that an outer surface 39a at the front portion thereof is flush with the roof receiving surfaces 35b of the left and right side frames 35 (see FIGS. 5 and 10).

  That is, the rear outer surface 37b of the second cross member 37 and the front outer surface 39a of the fourth cross member 39 can be used as a roof receiving surface.

  The fourth cross member 39 is processed such that the outer surface 39b at the rear part thereof is flush with the rear receiving surfaces 35d of the left and right side frames 35 (see FIGS. 5 and 11).

  The fifth cross member 40 is machined so that the upper outer surface 40a thereof is flush with the rear receiving surfaces 35d of the left and right side frames 35 (see FIGS. 5 and 11).

  That is, the rear outer surface 39b of the fourth cross member 39 and the upper outer surface 40a of the fifth cross member 40 can be used as rear receiving surfaces.

  Although not shown, the pair of left and right side members 20 in the base frame 18, the cross member 22 in the front and rear intermediate portion, the third cross member 38, the fifth cross member 40, and the sixth cross member 41 in the cabin frame 19, etc. And the corresponding side frame 35 of the cabin frame 19 is welded to each connecting member 30 of the base frame 18.

  As shown in FIGS. 1 to 6 and FIGS. 8 to 13, the front panel 32 is configured by attaching a weather strip 51 to the peripheral edge portion of a transparent curved glass 50, and the upper edge portion is interposed between a pair of left and right hinges 52. Are connected to the second cross member 37, and the lower edge thereof is connected to the first cross member 36 via a pair of left and right opening / closing holders 53, so that the pivot shaft 52A of each hinge 52 is used as a fulcrum. The opening / closing operation can be performed by swinging back and forth around the upper fulcrum, and the position can be held at a predetermined open position and a closed position.

  The rear panel 33 is configured by attaching a weather strip 55 to the peripheral edge of the transparent curved glass 54, and its upper edge is connected to the fourth cross member 39 via a pair of left and right hinges 56, and its lower edge Since the portion is connected to the fifth cross member 40 via a pair of left and right opening / closing holders 57, it is possible to perform an opening / closing operation by swinging back and forth around the upper fulcrum using the pivot shaft 56A of each hinge 56 as a fulcrum. In addition, the position can be held at a predetermined opening position and a closing position.

  Each of the left and right doors 34 has a transparent curved glass 59 having a weather strip 58 attached to the peripheral edge thereof, an outer handle 60 that allows opening / closing operation from outside the cabin, and an inner handle 61 that allows opening / closing operation from inside the cabin. And a frameless structure including a holding mechanism 62 that can be released from the inside and outside, and the rear edge of the side frame 35 via the pair of upper and lower hinges 63 at the center of the rear portion of the side frame 35 in the vertical direction. Are connected to a door mounting portion 35D that extends in a straight line, so that the hinge 63 can be opened and closed by swinging left and right around the fulcrum with the pivot shaft 63A as a fulcrum. The holding mechanism 62 engages with a fixing bracket (not shown) provided in the cabin frame 19 as it reaches the closed position, so that the predetermined closed position is reached. It is configured to be able location holding.

  As described above, the curved glass 50, 54, 59 is used for the front panel 32, the rear panel 33, and the left and right doors 34 that are configured to be swingable and openable, so that the shape retaining property thereof can be improved. Higher water resistance can be effectively suppressed due to the vibration of the vehicle body and the like, and the close contact with the cabin frame 19 in the closed state can be easily maintained in a high state. As a result, the comfort in the cabin 14 can be improved.

[Another embodiment]

[1] The work vehicle may be an agricultural work vehicle such as a tractor or a combiner, or a construction work vehicle such as a backhoe or a wheel loader.

[2] As the work vehicle, the cabin 14 is constituted only by the cabin frame 19, the cabin frame 19 is provided with only the roof panel 31 and the cabin 14 is constituted, and the cabin frame 19 includes the roof panel 31 and the front panel 32. The cabin 14 may be configured with the door 34, or the door 14 may be provided only on the left and right sides of the cabin 14, or the door 14 may be equipped with the sliding door 34. Good.

[3] The base frame 18 is formed by welding a pair of left and right side members 20 and a plurality of cross members 21 and 22 together with a support frame 24 that supports the engine 2 and the gear type transmission 4. Also good.

[4] The side frame 35 may be formed in a loop shape in which a part of the side frame 35 is separated, or may be constituted by a plurality of members.

[5] A deformed pipe in which the side frame 35 is recessed in a straight line over the entire length and formed with a single concave portion 35A in a cross-sectional view, a round pipe material or a square pipe material in which the concave portion 35A or the like is not formed, desired It is also possible to employ a molded product that has been extrusion molded so as to obtain the above shape, or a sheet metal material that has been punched into a closed loop shape or a loop shape.

[6] For each of the cross members 36 to 41, pipe material, angle material, channel material, or the like may be adopted. In particular, the first cross member 36, the second cross member 37, the fourth cross member 39, and the fifth cross member 40 that support the roof panel 31, the front panel 32, or the rear panel 33 are recessed in a straight line over the entire length. When a deformed pipe having a single concave portion 35A formed in a cross-sectional view is employed, the concave portion 35A can be used as a receiving surface of a corresponding panel, and each receiving surface is formed separately. In comparison, productivity can be improved.

Overall side view of work vehicle Overall plan view of work vehicle Side view showing work vehicle frame structure Plan view showing frame structure of work vehicle A perspective view showing a frame structure of a work vehicle Longitudinal front view of the main part showing the frame structure of the work vehicle A longitudinal front view of the main part showing the frame structure under the seat Cross sectional plan view of the main part showing the door and front panel receiving structure at the front of the cabin Longitudinal front view of the main part showing the door and roof panel receiving structure at the top of the cabin Longitudinal front view of the main part showing the door and roof panel receiving structure at the upper rear of the cabin Cross-sectional plan view of the main parts showing the door and rear panel receiving structure at the rear of the cabin Longitudinal front view of the main part showing a part of the connecting part between the base frame and the cabin frame Side view of main parts showing cabin structure

Explanation of symbols

1 Body frame 18 Base frame 19 Cabin frame 35 Side frame (deformed pipe)
35A Concave part 36 Cross member 37 Cross member 38 Cross member 39 Cross member 40 Cross member 41 Cross member

Claims (5)

  A frame structure of a work vehicle in which a body frame is constructed by welding a box-like cabin frame to a base frame.   2. The work vehicle frame structure according to claim 1, wherein the cabin frame is configured by connecting left and right side frames formed in a loop shape by a plurality of cross members.   The work vehicle frame structure according to claim 2, wherein a pipe material is adopted for the side frame.   The work vehicle frame structure according to claim 3, wherein a deformed pipe having a straight recess formed over the entire length thereof is adopted as the pipe material.   The work frame structure according to any one of claims 2 to 4, wherein the side frame is formed of a single member.