JP2011126352A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle with improved safety which prevents breakage of a floor panel. <P>SOLUTION: A driver's seat is installed on the rear side of a vehicle body, and a hood 5 is installed in the front of the vehicle body. The floor panel is extended between the driver's seat and the hood 5. Pairs of lateral frame members 22L, 22L', 22R, and 22R' separated in back and forth direction on the left and right sides than a transmission case 8 disposed in the center of the vehicle body are projected. Longitudinal frame members 21L and 21R for connecting individual outer end portions of these lateral frame members 22L, 22L', 22R and 22R' are installed. Support members 26 for supporting the floor panel 13 are disposed on the lateral frame members 22L, 22L', 22R, and 22R' or/and the longitudinal frame members 21L and 21R. Load impact mitigation means 27 for mitigating load impact exerted on the outer end portion of the floor panel are installed in the longitudinal frame members 21L and 21R located between the support members 26. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a work vehicle having a driver's seat on the rear side of a vehicle body, a bonnet at the front of the vehicle body, and a floor panel stretched between the driver's seat and the bonnet, and more specifically, a vehicle body center portion. A pair of horizontal frame members extending in the front-rear direction to the left and right sides from the transmission case disposed in the frame, and provided with a vertical frame member that connects each outer end of the horizontal frame member, / And work to provide a load impact mitigation means for mitigating the load impact applied to the outer end of the floor panel on the vertical frame member located between the support members, while providing the vertical frame member with a support member for supporting the floor panel Regarding vehicles.

  Conventionally, in a work vehicle such as a tractor, for example, a vehicle body is configured by a transmission case extending backward from an engine, and a floor panel is mounted on the transmission case via a cushioning material. A driver's seat on which an operator gets on board is provided, and this cushioning material is provided at four places on the front, rear, left and right sides of the floor panel to prevent the floor panel from vibrations generated in the vehicle body (for example, Patent Documents). 1) There is something.

JP 2009-132309 A

However, in such a work vehicle, since cushioning materials are provided on the front, rear, left and right of the floor panel located inside the floor panel, when the operator gets on and off the floor panel panel using the lifting step, When an operator puts his feet on the outer edge of the floor panel, the outer edge of the floor panel swings, giving the operator a sense of incongruity, especially when the floor step is made of resin, compared to sheet metal. Since the strength is weak, there is a risk that the floor panel may be damaged as a result of frequent loads and impacts applied to the outer edge of the floor panel.
SUMMARY OF THE INVENTION An object of the present invention is to provide a work vehicle with improved safety that can prevent damage to a floor panel.

  For this reason, the invention according to claim 1 includes a driver's seat on the rear side of the vehicle body, a hood at the front of the vehicle body, and a floor panel stretched between the driver's seat and the hood. In a work vehicle, a vertical frame member that extends a pair of horizontal frame members that are separated in the front-rear direction from the transmission case disposed in the center portion of the vehicle body in the front-rear direction and connects the outer end portions of the horizontal frame members. A support member for supporting the floor panel is provided on the horizontal frame member and / or the vertical frame member, and the vertical frame member positioned between the support members is applied to the outer end portion of the floor panel. A load impact mitigation means for mitigating the load impact is provided.

  According to a second aspect of the present invention, in the work vehicle according to the first aspect, the load impact reducing means is an elastic member.

  According to a third aspect of the present invention, in the work vehicle according to the first or second aspect, the vertical frame member is provided with a protruding portion protruding upward, and the elastic member is detachably attached to the protruding portion. It is characterized by wearing.

  According to the first aspect of the present invention, in the work vehicle having a driver's seat on the rear side of the vehicle body, a bonnet at the front of the vehicle body, and a floor panel stretched between the driver's seat and the bonnet, A horizontal frame is provided with a vertical frame member that extends a pair of horizontal frame members that are separated from each other in the front-rear direction to the left and right sides of the transmission case disposed in the center of the vehicle body, and that connects each outer end of the horizontal frame member. The member or / and the vertical frame member is provided with a support member for supporting the floor panel, and the vertical frame member positioned between the support members is provided with a load impact reducing means for reducing a load impact applied to the outer end portion of the floor panel. For example, when the operator gets on and off the floor panel using the lifting step, even if the operator steps on the outer edge of the floor panel and steps on it, the load impact Sum means for absorbing the load impact on the floor panel, it is possible to prevent damage to the floor panel.

  According to the second aspect of the present invention, since the load impact mitigating means is an elastic member, the load impact can be efficiently absorbed and the floor panel can be prevented from being damaged.

  According to the invention described in claim 3, since the vertical frame member is provided with a protruding portion protruding upward, and the elastic member is detachably attached to the protruding portion, the outer end of the vertical frame member, The gap with the outer end of the floor panel can be made as narrow as possible, the amplitude of the outer end of the floor panel can be reduced, and the load impact can be absorbed by the elastic member attached to the protruding part. Damage to the panel can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a left side view of a lops-specification wheel type tractor as an agricultural vehicle according to an embodiment of the present invention. It is a perspective view of a fender and a floor panel. It is a top view of a floor panel. It is a top view of the vehicle front part explaining a vertical frame and a horizontal frame. It is an expansion perspective view of a vertical frame and a horizontal frame. It is an expansion perspective view of a load impact mitigation means. It is a back surface schematic diagram of the one end part of the floor panel which installed the air damper which is a damper member as a load-proof impact means. It is a back surface schematic diagram of the one end part of the floor panel which installed the oil damper which is a damper member as a load-proof impact means.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 is a left side view of a wheel-type tractor having a lops specification according to an embodiment of the present invention. In addition, the tractor illustrated in the figure is not limited to the wheel-type tractor of the lops specification, and may be a cabin specification or a crawler type.

  The wheel-type tractor 1 includes a front wheel 2 and a rear wheel 3, and a bonnet 5 is formed on the body frame 4 above the front wheel 2, and an engine 6 serving as a prime mover is disposed inside the hood 5. A clutch housing (not shown) and a mission case 8 which will be described later are provided in order behind the engine 6.

  A steering column 12 with a steering handle 11 projecting upward is provided behind the dashboard 9 connected to the bonnet 5, and a floor panel 13, which will be described later, is provided below the steering column 12. A foot accelerator pedal 14 and the like are disposed on the floor panel 13 to constitute the steering mechanism 10, and a driver seat 15 and the like are provided at the rear of the steering mechanism 10. Reference numeral 20 denotes a lops frame provided at the rear of the aircraft.

  The driver's seat 15 is disposed between the left and right fenders 16 having a shape in which the front portion is bent downward and above the rear wheel 3, and a fuel tank 17 is disposed behind the driver's seat 15. The Further, the left and right fenders 16 are provided with various operation levers 18 such as an auxiliary transmission lever and a PTO lever, for example. Reference symbol s denotes an ascending / descending step that assists the operator to get on and off.

  Next, a specific configuration of the floor panel, which is a feature of the present invention, will be described. 2 is a perspective view of the fender and the floor panel, FIG. 3 is a plan view of the floor panel, FIG. 4 is a plan view of the front of the vehicle illustrating the vertical frame and the horizontal frame, and FIG. 5 is an enlarged perspective view of the vertical frame and the horizontal frame. FIG. 6 is an enlarged perspective view of the load impact relaxation means.

  First, as shown in FIGS. 2 to 3 and as described above, the floor panel 13 made of synthetic resin or the like is provided between the hood 5 and the driver's seat 15. A normal floor sheet 19 is attached on the floor panel 13.

  Below the floor panel 13, a mission case 8 (not shown in FIGS. 2 to 3) is disposed in the center of the vehicle body, and on the left and right side surfaces of the mission case 8, as shown in FIG. A pair of horizontal frame members 22L, 22L ′, 22R, and 22R ′ that are spaced apart in the front-rear direction are extended by bolt fastening or the like. In FIG. 4, the floor panel 13 is removed and shown. Furthermore, the lateral frame members 22L and 22L ′ (22R and 22R ′) are arranged on the outer end portions (22L and 22L ′ and 22R and 22R ′) of the lateral frame members 22L and 22L ′ (22R and 22R ′). ) Are connected by bolt fastening or the like. The rear end portions of the vertical frame members 21L and 21R are fixed to the front end portions of the left and right fenders 16 by fastening bolts or the like.

  The horizontal frame member 22R ′ on the right side of the vehicle is obliquely provided from the front part of the transmission case 8 to the rearward outer part (the obliquely provided part is not shown), and the rear end thereof is provided as the vertical frame member 21R. It is connected to the rear end by bolt fastening. A vertical frame member 21R ′ is installed inside the horizontal frame members 22R and 22R ′ in parallel with the vertical frame member 21R across the foot accelerator pedal 14, and the vertical frame member 21R ′ has a front end. The part is fixed to the horizontal frame member 22R by bolting or the like. The rear end portion of the vertical frame member 21R ′ protrudes from the vicinity of the center of the transmission case 8 in the left-right direction, and is fastened with bolts between the transmission case 8 and the inner and continuous portions of the fender 16. It is fixed to a pair of right and left frames f provided by bolt fastening or the like. Accordingly, the horizontal frame members 22R and 22R ′ and the vertical frame members 21R and 21R ′ are configured to have a shape including a substantially P-shape (not limited) in plan view, which makes it easy to project the foot accelerator pedal 14 upward. It is.

  On the other hand, the horizontal frame members 22L and 22L ′ and the vertical frame member 21L on the left side of the vehicle are configured in a substantially triangular shape (not limited) in plan view, and further, the outer end of the vertical frame member 21L is directed downward. Thus, an elevating step s for assisting the operator to elevate the floor 21 is attached by bolting or the like.

  In addition, the raising / lowering step s is not restricted to arrangement | positioning to the vehicle body left drawing wheel part mentioned above, You may provide in the left-right both sides of a vehicle body.

  And since the mission case 8 is located in the center part of the floor panel 13, the center projecting part 23 projecting upward is formed along the upper surface of the mission case 8, and the left and right sides of the center projecting part 23. The left and right flat portions 24 that are lower than the height position of the central projecting portion 23 along the upper surface of the left and right side frames 22 are connected to the left and right side surfaces of the central projecting portion 23.

  Further, the above-described central projecting portion 23 and the left and right flat portions 24 constituting the floor panel 13 are detachably connected by a fastener 25 such as a bolt so that the floor panel 13 can be assembled. And maintenance of the mission case 8 are improved. The thickness of the floor panel 13 can be, for example, 2.4 mm for the central projecting portion 23 that requires strength to support the left and right flat portions 24 and 2.1 mm for the left and right flat portions 24.

  And, for example, a support member 26 made of anti-vibration rubber is provided on the outer side of the horizontal frame members 22L and 22R, on the rear end of the vertical frame members 21L and 21R, and on the outer end of the frame f. At the same time, anti-vibration rubber 32 is mounted on the upper surface of the mission case 8 (two locations in the longitudinal direction of the vehicle body), and the floor panel 13 is installed via the support member 26 and the anti-vibration rubber 32.

  Accordingly, the load generated on the floor panel 13 by the operator stepping on the floor panel 13 is buffered by the anti-vibration rubber 32, and vibrations generated in the vehicle by driving the engine 6 or traveling the vehicle are Absorbed by the support member 26, the worker can work comfortably on the floor panel 13.

  Next, the frame 22 that supports the floor panel 13 of the present invention is provided with load impact mitigation means. When an operator moves his / her foot up / down on the floor panel 13 from the lifting / lowering step s to the floor panel 13 or from the floor panel 13 to the lifting / lowering step s, the outer end portion a of the flat portion 24 in the floor panel 13. There is a foot on top.

  For this reason, the load due to the weight of the operator or the like is concentrated on the outer end a of the flat portion 24 in the floor panel 13, and the outer end a located on the vertical frame member 21L and between the support members 26 is bent. The floor panel 13 may be damaged.

  In view of this, the vertical frame member 21 </ b> L positioned between the support members 26 is provided with a load impact reducing means 27 that reduces the load impact applied to the outer end portion a of the floor panel 13. In addition, although the load impact mitigation means 27 described below is provided in the left and right vertical frame members 21L and 21R, it may be provided in one vertical frame member 21L (21R) including the lifting step s.

  First, as shown in FIG. 6, the vertical frame members 21 </ b> L and 21 </ b> R are protruded to a height such that the outer end faces upward and the upper end does not contact the bottom of the flat portion 24 in the floor panel 13. , Forming a protrusion t.

  Then, a substantially U-shaped elastic member 28 as the load impact mitigating means 27 is detachably attached to, for example, two front and rear positions (a plurality of positions) of the protrusion t. The elastic member 28 can be a cushion rubber made of hard rubber or the like.

  With this configuration, when the operator moves up and down, particularly on the floor panel 13, the lift step s or the floor panel 13 is on the vertical frame member 21 </ b> L of the floor panel 13 and between the support members 26. Even if a load is applied to the outer end a by placing the foot on the outer end a positioned, the gap between the outer end of the vertical frame member 21L and the outer end a of the floor panel 13 is made as much as possible. Therefore, the amplitude of the outer end a of the floor panel 13 can be reduced. Further, when the operator rides on the floor panel 13 or sits on the driver's seat 15 and steers the aircraft, the vertical frame is applied even if the load on the flat portion 24 on the right side of the floor panel 13 is applied by the operator's feet. Since the gap between the outer end portion of the member 21R and the outer end portion a ′ on the right side of the floor panel 13 is made as small as possible, the same effect as described above can be obtained.

  Further, since the elastic member 28 absorbs and supports the above-described load, the floor panel 13 and the vertical frame can be supported without the outer end portions a and a ′ of the floor panel 13 being bent and swung or pressed down. Damage to the members 21L and 21R can be prevented.

  The load bearing impact means 27 is not limited to the elastic member 28 described above, and a damper member may be used. FIG. 7 is a schematic back view of one end of a floor panel in which an air damper, which is a damper member, is installed as a load bearing impact means.

  In this case, as the damper member 29, for example, as shown in FIG. 7, an air damper 30 comprising a cylinder 30b in which a piston 30a is slidable in the vertical direction and air is contained is used, and the outer end a (a ′) The upper end of the piston 30a is attached to the bottom of the cylinder 30b, and the cylinder 30b is installed on the vertical frame member 21L (21R). An air circulation hole (not shown) is provided in the side of the cylinder 30b or the head of the piston 30a.

  With such a configuration, when an operator steps on the outer end portion a (a ′) of the floor panel 13 and the outer end portion a (a ′) is lowered due to the load, the piston 30a is also lowered. The lower air becomes an air spring (a part of the air is discharged from the flow hole), supports the load applied to the outer end a (a ′) and the piston 30a, and absorbs the impact, thereby Similar effects can be obtained.

  In addition, when the load applied to the outer end a (a ′) is released by releasing the foot from the outer end a (a ′) of the floor panel 13, the outer end a ( When a ′) returns to the original position by the reaction (up), the piston 30a also rises to the original position while taking air into the cylinder 30b from the flow hole.

  Further, the damper member 29 is not limited to the air damper 30 and may be an oil damper. FIG. 8 is a schematic back view of one end of a floor panel in which an oil damper as a damper member is installed as a load bearing impact means.

  Also in this case, as illustrated in FIG. 8, the oil damper 31 including the piston 31 a and the cylinder 31 b is used to attach the upper end of the piston 31 a to the bottom of the outer end a (a ′), and the vertical frame member 21 </ b> L (21 </ b> R). ) Is provided with a cylinder 31b filled with oil. This cylinder 31b may have a double structure including an outer cylinder 31ba and an inner cylinder 31bb, and oil is supplied to both cylinders 31ba via a base valve b. , 31bb.

  With such a configuration, when the operator steps on the outer end a (a ′) and the outer end a (a ′) descends due to the load, the piston 30a also descends. The oil in the cylinder 31bb becomes an oil spring (a part of the oil in the inner cylinder 31bb moves into the outer cylinder 31ba through the base valve b), and supports the load applied to the outer end a (a ′) and the piston 31a. In addition, the same effect as described above can be obtained by absorbing the impact. Even when the load is released, the piston 31a returns to the original position in the same manner as described above.

  As described in detail above, the working vehicle (tractor 1) of this example includes the driver's seat 15 on the rear side of the vehicle body, and includes the hood 5 at the front portion of the vehicle body, between the driver's seat 15 and the hood 5. A floor panel 13 is stretched to extend a pair of horizontal frame members 22L, 22L ′, 22R, and 22R ′ that are spaced apart in the front-rear direction to the left and right sides of the transmission case 8 disposed in the center of the vehicle body. The vertical frame members 21L and 21R that connect the outer ends of the horizontal frame members 22L, 22L ′, 22R, and 22R ′ are provided, and the horizontal frame members 22L, 22L ′, 22R, 22R ′, and / or the vertical frame members 21L, 21R is provided with a support member 26 that supports the floor panel 13, and the vertical frame members 21L and 21R located between the support members 26 are provided with outer end portions a, To alleviate the load impact on the 'is intended to provide a load shock absorbing means 27.

  In the above-mentioned example, the wheel type tractor of an agricultural work vehicle has been described as an example of the work vehicle. However, the present invention is not limited to this, and a floor panel such as a crawler type tractor, a combiner, or a construction work vehicle is used. The present invention can be applied to any work vehicle in which a vertical frame member to be supported is provided with a lifting step.

8 Mission case 13 Floor panel 21L, 21R, 21R ′ Vertical frame member 22L, 22L ′, 22R, 22R ′ Horizontal frame member 23 Center projecting portion 24 Left and right flat portion 26 Support member 27 Load bearing impact means 28 Elastic member 32 Vibration isolation Rubber a, a 'Outer end s Elevating step t Protruding part

Claims (3)

In the work vehicle having a driver's seat on the rear side of the vehicle body, a bonnet at the front of the vehicle body, and a floor panel stretched between the driver's seat and the bonnet,
A longitudinal frame member extending in a front-rear direction to the left and right sides from the transmission case disposed in the vehicle body central portion, extending a pair of horizontal frame members, and connecting the outer end portions of the horizontal frame members,
A support member for supporting the floor panel is provided on the horizontal frame member or / and the vertical frame member, and
A work vehicle, wherein the vertical frame member positioned between the support members is provided with a load impact mitigating means for mitigating a load impact applied to an outer end portion of the floor panel.   The work vehicle according to claim 1, wherein the load impact relaxation means is an elastic member.   The work vehicle according to claim 1, wherein the vertical frame member is provided with a protruding portion protruding upward, and the elastic member is detachably attached to the protruding portion.

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