JP4689203B2 - Work vehicle cabin - Google Patents

Description

  The present invention relates to a cabin technology for a work vehicle that covers a control section.

2. Description of the Related Art Conventionally, a cabin technology that covers a control portion of a work vehicle (a portion provided with operating means related to traveling and work of the work vehicle) has been publicly known. Many of such cabins are provided with a vibration isolation support member between the body of the work vehicle and the operator to improve the comfort of the worker by reducing vibration and noise. For example, as described in Patent Document 1.
JP 2003-237621 A

  The frequency (frequency) of noise and vibration propagating from the machine body of the work vehicle to the cabin is the structure on the machine body side where the cabin (more precisely, the anti-vibration support member provided between the cabin and the machine body) is fixed Is known to be affected by the natural frequency, and the greater the natural frequency, the greater the frequency (frequency) of generated noise and vibration. Here, noise and vibration that are unpleasant for the operator generally have a large frequency (frequency). Such noise or vibration with a large frequency (frequency) is generally generated from a small member.

  For example, when the work vehicle is a tractor, in many of the tractors, a chassis, which is a main structure of the fuselage, is arranged in the left and right central part of the fuselage, and the width of the chassis in the lateral direction of the fuselage is a large-diameter wheel. Is considerably smaller than the total width of the tractor. On the other hand, from the viewpoint of improving the comfort of workers by making the cabin interior space as large as possible, the cabin width in the left-right direction of the cabin is increased as much as possible without exceeding the full width of the tractor, and the cabin exterior is made as much as possible. It has a substantially rectangular parallelepiped shape. Accordingly, the width of the tractor chassis in the left-right direction is usually smaller than the width of the cabin in the left-right direction. In the conventional tractor, since the cabin has a substantially rectangular parallelepiped shape, vibration-proof support members are provided at the four corners of the bottom of the cabin in order to effectively support the cabin load.

  Therefore, in the conventional tractor, as shown in FIG. 8, among the four corners of the cabin 112, the front left position 174 which is the front end and the left end and the front right position 175 which is the front end and the right end of the cabin 112 are supported. In order to achieve this, brackets 302a and 302a projecting to the left and right sides of the chassis 302 are provided, and vibration-proof support members 160 and 160 are provided between the brackets 302a and 302a and the cabin 112. However, since the brackets 302a and 302a are small members as compared with the chassis 302, the generated noise and vibration frequency (frequency) are large, which causes a decrease in the comfortability of the cabin 112.

  In view of the above circumstances, the present invention provides a cabin of a work vehicle that is uncomfortable for an operator, reduces noise and vibration with a high frequency (frequency), and is excellent in comfort.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

In Claim 1, it is the cabin (12) of the work vehicle which interposed the anti-vibration support member (60) between the body of the tractor (201), Comprising: It is a front end of this cabin (12), and left-right substantially A front center position (71) as a center, a rear left position (72) as a rear end and a left end of the cabin (12), and a rear right position (73) as a rear end and a right end of the cabin (12); These anti-vibration support members (60) are disposed only at the three locations .

  According to a second aspect of the present invention, in the cabin of the work vehicle according to the first aspect, the front left position (174) which is the front end and the left end of the cabin (12) and the front right position which is the front end and the right end of the cabin (12) ( 175), an oil damper (80, 80) or an air damper is provided on one or both of them.

  In Claim 3, in the cabin of the work vehicle according to Claim 1, the front left position (174) which is the front end and the left end of the cabin (12) and the front right position which is the front end and the right end of the cabin (12) (175) is provided with a tilt regulating member (90, 90) made of rubber, and the tilt regulating member (90, 90) is fixed to either the cabin (12) or the fuselage, and the cabin (12 ) Comes into contact with the cabin (12) and the non-fixed one of the aircraft when tilted more than a predetermined tilt angle in the left-right direction of the aircraft.

  As effects of the present invention, the following effects can be obtained.

In Claim 1, it is the cabin (12) of the work vehicle which interposed the anti-vibration support member (60) between the body of the tractor (201), Comprising: It is a front end of this cabin (12), and left-right substantially A front center position (71) as a center, a rear left position (72) as a rear end and a left end of the cabin (12), and a rear right position (73) as a rear end and a right end of the cabin (12); Since the vibration-proof support member (60) is disposed on the vehicle body, the vibration and noise propagated from the structure on the machine body side of the work vehicle to the cabin of the work vehicle through the vibration-proof support member are reduced and the vibration and noise are reduced. The frequency (frequency) can be reduced, and the comfort of the cabin of the work vehicle is improved.
In particular, the anti-vibration support member (60) is disposed only at three locations of the front center position (71), the rear left position (72), and the rear right position (73) of the cabin (12). The anti-vibration support members (60) provided at three locations regardless of the accuracy are positioned on substantially the same plane, and the anti-vibration support member (60) is distorted in a direction other than the vertical direction when the tractor (201) is left standing. It is possible to prevent the occurrence .

  The anti-vibration support member (60) is provided between a floor plate (15) which is a structural body on the cabin (12) side and a chassis (202) which is a structural body on the airframe side. (15) and a first anti-vibration rubber (61) in contact with the chassis (202), and provided on the opposite side of the first anti-vibration rubber (61) across the floor plate (15). A second anti-vibration rubber (62) in contact with the plate (15) and the second anti-vibration rubber provided on the opposite side of the floor plate (15) with the second anti-vibration rubber (62) sandwiched therebetween A pressing plate (63) in contact with (62), the floor plate (15), the first anti-vibration rubber (61), the chassis (202), the second anti-vibration rubber (62), and the pressing plate (63 ), And has a fastening member (64) for fastening. It is possible to reduce vibration and noise propagated to the cabin from the airframe side structure of the vehicle, thereby improving cabin comfort of the work vehicle.

  In addition, it is possible to prevent noise originating from a member fixed to the structure on the machine body side of the work vehicle without using vibration-proof rubber from propagating to the interior space of the work vehicle cabin. The comfort of the cabin of the vehicle is improved.

  According to a second aspect of the present invention, in the cabin of the work vehicle according to the first aspect, the front left position (174) which is the front end and the left end of the cabin (12) and the front right position which is the front end and the right end of the cabin (12) ( 175), an oil damper (80/80) or an air damper is provided on one or both of them, so that the movement of the cabin of the work vehicle excessively tilting in the left-right direction with respect to the body of the work vehicle may be restricted. Is possible.

  In Claim 3, in the cabin of the work vehicle according to Claim 1, the front left position (174) which is the front end and the left end of the cabin (12) and the front right position which is the front end and the right end of the cabin (12) (175) is provided with a tilt regulating member (90, 90) made of rubber, and the tilt regulating member (90, 90) is fixed to either the cabin (12) or the fuselage, and the cabin (12 ) Comes into contact with the cabin (12) and the non-fixed one of the aircraft when the vehicle is tilted more than a predetermined tilt angle in the lateral direction of the aircraft with respect to the aircraft. It is possible to restrict the movement of the cabin that tilts excessively in the left-right direction (rolls).

  Further, it is possible to restrict the movement of the cabin of the work vehicle that is excessively tilted (rolled) in the left-right direction with respect to the body of the work vehicle.

  Below, the whole structure of the tractor 201 which is one Embodiment of the working vehicle which concerns on this invention is demonstrated using FIG.

  The work vehicle according to the present invention is not limited to the tractor 201 of the present embodiment, but is a work vehicle on which an operator rides and operates such as an agricultural vehicle such as a combine or a transport vehicle, or a construction machine such as a backhoe or a loader. Widely applicable to.

  In the following description, the direction of arrow A in FIG. 1 (the direction in which the tractor 201 moves when traveling straight) is referred to as “front” of the tractor 201, and the front side of FIG. .

  The tractor 201 is configured integrally with a clutch housing connected to the rear part of the engine and a transmission case connected to the rear part as a chassis 202 in the front-rear direction at the left and right center of the body, and the chassis 202 is arranged at the left and right center of the body. Other members constituting the tractor 201 are attached to the chassis 202. The chassis 202 of this embodiment is a main structure of the tractor 201.

  Front wheels 1 and 1 and rear wheels 2 and 2 are supported before and after the tractor 201. An engine 5 is disposed inside the hood 6 at the front of the tractor 201. A cabin 12 is provided behind the bonnet 6. A steering handle 10 is disposed inside the cabin 12, and a seat 11 is disposed behind the steering handle 10. Further, a group of operation levers such as a main transmission lever, a sub transmission lever, and a PTO operation lever are disposed on the side portion of the seat 11. Here, what the operator operates to steer the work vehicle (the tractor 201 in this embodiment) (in this embodiment, the steering handle 10, the operating lever group, etc.) is collectively referred to as a “steering portion”. . A clutch housing 7 is disposed at the rear of the engine 5, and a transmission case 9 is disposed at the rear of the clutch housing 7. The driving force from the engine 5 is transmitted to the front wheels 1 and 1 and the rear wheels 2 and 2 for driving. .

  Hereinafter, the detailed configuration of the cabin 12 which is the first embodiment of the cabin of the work vehicle according to the present invention will be described with reference to FIGS. 1, 2, and 3. As shown in FIGS. 1 and 2, the cabin 12 covers the periphery of the seat 11 of the tractor 201 and protects workers from wind and rain, direct sunlight, and the like. Therefore, a steering unit for the tractor 201 is provided inside the cabin 12. The cabin 12 mainly includes a frame group including a pair of left and right side frame units 20 and 20, a lower frame unit 21, a front upper frame 23, a rear upper frame 24, a front center frame 81, and the like constituting the structure of the cabin 12, A front windshield 13 attached to the frame group, a pair of left and right doors 50 and 50, a rear windshield 51, a covering member group including a roof 41 provided on the upper surface of the cabin 12, and the like.

  As shown in FIG. 2, the pair of left and right side frame units 20, 20 is a structure that forms left and right side portions of the cabin 12. In addition, since the side frame units 20 and 20 of the present embodiment are configured substantially symmetrically, only the side frame unit 20 that forms the left side surface portion of the cabin 12 will be described in the following description. The side frame unit 20 mainly includes a front pillar 40, a rear pillar 14, a side upper frame 44, a side step frame 42, a fender 33, and the like.

  The front pillar 40 is a member that forms the front portion of the side frame unit 20 and supports the left front end of the roof 41 of the cabin 12. The front pillar 40 is a pipe-like member, and is bent into a substantially “<” shape in the middle in a side view.

  The rear pillar 14 is a member constituting the rear portion of the side frame unit 20 and supports the left rear end of the roof 41 of the cabin 12.

  The side upper frame 44 is a member that forms the upper part of the side frame unit 20. The front end of the side upper frame 44 is fixed to the upper end portion of the front pillar 40, and the rear end of the side upper frame 44 is fixed to the upper end portion of the rear pillar 14.

  The side step frame 42 is a member that forms the lower front half of the side frame unit 20. The front end of the side step frame 42 is fixed to the lower end portion of the front pillar 40, and the rear end of the side step frame 42 is fixed to the front end portion of the fender 33. The side step frame 42 also functions as a step for an operator to take a foot when getting on and off.

  The fender 33 is a member constituting the lower second half of the side frame unit 20, and one end thereof is fixed to the rear end portion of the side step frame 42, and the rear end thereof is fixed to the lower end portion of the rear pillar 14. The fender 33 is opposed to the rear wheels 2 and 2 and prevents dirt, mud, and the like splashed by the rear wheels 2 and 2 from entering the cabin 12.

  The lower frame unit 21 is a structure constituting the lower surface of the cabin 12. The lower frame unit 21 mainly includes a pair of left and right down frames 26 and 26, a rear center frame 30, a dust cover 29, a seat fixing member 38, an air cut plate 39, front stays 27 and 27, rear mount stays 28 and 28, and a floor plate. 15 etc.

  The down frames 26 and 26 are members that are bent into a substantially “<” shape when viewed from the side, and form a portion from the lower part to the rear part of the lower frame unit 21. The front end portions of the down frames 26 and 26 are respectively fixed to the left and right lower end portions of the air cut plate 39, and the rear end portions are respectively fixed to the left and right end portions of the rear center frame 30.

  The rear center frame 30 is a member that forms the rear portion of the lower frame unit 21, and is fixed to the rear end portions of the down frames 26 and 26.

  The dust cover 29 is a member that forms the rear surface of the lower frame unit 21. The dust cover 29 is fixed to the rear portions of the down frames 26 and 26 and the rear center frame 30 to improve the rigidity of the lower frame unit 21, and the lower portion of the rear surface of the cabin 12. The soil is blocked and dirt or mud is prevented from entering the cabin 12.

  The seat fixing member 38 is a member disposed above the down frames 26 and 26 and in front of the rear center frame 30, and the seat 11 and the operation lever group are disposed on the upper surface thereof.

  The air cut plate 39 is a member that forms the front surface of the lower frame unit 21, and the lower end portion thereof is fixed to the front end portions of the down frames 26 and 26. The air cut plate 39 has a function of preventing noise and outside air from entering the cabin 12 from the bonnet 6 and a function of a mounting member provided with the steering handle 10, other instruments, an operation pedal, and the like.

  The front stays 27 and 27 are members fixed to the front ends of the down frames 26 and 26, respectively. The front stays 27 and 27 are connected to the front part of the lower frame unit 21 and the front part of the side frame unit 20 (side step frames 42 and 42). Fix it.

  The rear mount stays 28 and 28 are members fixed to the bent portions of the down frames 26 and 26, respectively, and fix the rear portion of the lower frame unit 21 and the rear portions of the side frame units 20 and 20 (fenders 33 and 33). And the function of fixing one end of a vibration isolating support member 60 to be described later.

  The floor plate 15 is attached to the air cut plate 39, the first half of the down frames 26 and 26, and the seat fixing member 38. The floor plate 15 has both a function as a bottom surface of the cabin 12 and a function of fixing one end of a vibration-proof support member 60 described later.

  As shown in FIG. 1, the front windshield 13 is formed in the opening on the front surface of the cabin 12 surrounded by the front upper frame 23, the front pillars 40 and 40, and the front center frame 81 among the members constituting the frame of the cabin 12. Fixed. The front windshield 13 is made of a transparent material such as glass or resin.

  The rear windshield 51 is fixed to an opening on the rear surface of the cabin 12 surrounded by the rear upper frame 24, the rear pillars 14 and 14, and the rear center frame 30 among members constituting the frame of the cabin 12. The rear windshield 51 is made of a transparent material such as glass or resin.

  The doors 50 and 50 are formed in the left and right side openings of the cabin 12 surrounded by the front pillar 40, the rear pillar 14, the side upper frame 44, the side step frame 42, and the fender 33 among members constituting the frame of the cabin 12. Each can be opened and closed.

  Hereinafter, a detailed configuration of the vibration isolating support member 60 and a first embodiment of the cabin of the work vehicle according to the present invention will be described with reference to FIGS. 3 and 4. 3 is arranged at a front center position 71 (shown in FIG. 4) which is the front end of the cabin 12 and substantially the center of the left and right of the plurality of anti-vibration support members 60, 60... Provided in the cabin 12. A side sectional view of the vibration isolating support member 60 is shown. The anti-vibration support member 60 functions to support the cabin 12 with respect to the fuselage of the tractor 201 (support function), and to prevent the vibration and noise on the fuselage side of the tractor 201 from propagating to the cabin 12 (anti-vibration function). ). The anti-vibration support member 60 is interposed between the body of the tractor 201 and the cabin 12. Here, the anti-vibration support member 60 “supports” the cabin 12 means that the anti-vibration support member 60 not only supports the load of the cabin 12 but also the attitude change of the tractor 201 and the body of the tractor 201 received. It also includes restricting the amount by which the cabin 12 moves or swings relative to the body of the tractor 201 in the up / down, front / rear and left / right directions within a predetermined range.

  As shown in FIG. 3, the anti-vibration support member 60 mainly includes an anti-vibration rubber 61, an anti-vibration rubber 62, a pressing plate 63, a fastening member 64, a sound insulation member 65, and the like.

  The anti-vibration rubber 61 is an embodiment of the first anti-vibration rubber and functions as a shock absorbing material that absorbs impact, vibration and noise. The anti-vibration rubber 61 is made of an elastic material such as rubber, and is provided between the structure on the cabin 12 side and the structure on the body side, and abuts on the structure on the cabin 12 side and the structure on the body side.

  Here, as shown in FIG. 2 and FIG. 4, “the structure on the cabin 12 side” refers to a member on the cabin 12 side to which the vibration isolating support member 60 is fixed. In the case of the support member 60, the rear mount stays 28 and 28 are the structure on the cabin 12 side in the case of the vibration-proof support members 60 and 60 disposed at the floor plate 15, the rear left position 72 or the rear right position 73. Equivalent to. The “airframe-side structure” refers to a body-side member to which the anti-vibration support member 60 is fixed. In the case of the anti-vibration support member 60 disposed at the front center position 71, the chassis 202, the rear left In the case of the anti-vibration support members 60 and 60 arranged at the position 72 or the rear right position 73, the stay (not shown) protruding from the mission case 9 corresponds to the “airframe-side structure”.

  The anti-vibration rubber 62 is an embodiment of the second anti-vibration rubber, and functions as a cushioning material that absorbs impact, vibration and noise. The anti-vibration rubber 62 is made of an elastic material such as rubber. The anti-vibration rubber 62 is provided on the opposite side of the anti-vibration rubber 61 across the structure on the cabin 12 side and abuts on the structure on the aircraft side.

  The pressing plate 63 is a plate-like member, is provided on the opposite side of the structure on the cabin 12 side with the vibration isolating rubber 62 interposed therebetween, and contacts the vibration isolating rubber 62.

  The fastening member 64 is a member that penetrates and fastens the structure on the airframe side, the vibration isolating rubber 61, the structure on the cabin 12 side, the vibration isolating rubber 62, and the pressing plate 63. In the case of this embodiment, the fastening member 64 includes a bolt 64a and a nut 64b. First, the bolt 64a is screwed into a screw hole provided in a structure on the machine body side (in the case of FIG. 3, the upper surface of the chassis 202) and fixed to the structure on the machine body side. ) Protrudes upward from the upper surface of the chassis 202. Next, an anti-vibration rubber 61, a structure on the cabin 12 side (floor plate 15 in the case of FIG. 3), an anti-vibration rubber 62, and a pressing plate 63 are sequentially inserted in the body portion of the bolt 64a. Finally, the nut 64b is screwed onto the bolt 64a, and the anti-vibration support member 60 is fixed to the structure on the cabin 12 side and the structure on the machine body side. At this time, since the structure on the airframe side, the fastening member 64, and the pressing member 63 are configured not to contact the structure on the cabin 12 side, vibration and noise of the structure on the airframe side are always vibration-proof rubber. It propagates to the structure on the cabin 12 side through either one or both of 61 and vibration-proof rubber 62. Therefore, vibration and noise propagating from the structure on the airframe side of the tractor 201 to the structure on the cabin 12 side are reduced, and the comfortability of the cabin 12 is improved. The rubber material (type), size (area and thickness), and shape of the anti-vibration rubber 61 and the anti-vibration rubber 62 are appropriately determined according to the load and shape of the cabin 12, the use mode of the work vehicle, and the like. It is desirable to choose. Further, the anti-vibration rubber 61 and the anti-vibration rubber 62 do not necessarily have the same material, shape, and thickness, and may be configured to have different materials, shapes, and thicknesses.

  The sound insulation member 65 is a member that covers the anti-vibration rubber 62 and the pressing plate 63. The sound insulation member 65 is made of a material capable of absorbing noise and vibration, such as plastic, rubber, sponge, and the like. Alternatively, a material capable of absorbing noise and vibration, such as plastic, rubber, and sponge, may be attached to the inner peripheral surface of the sound insulating member 65 (the surface on the side facing the vibration isolating rubber 62 and the pressing plate 63). By covering the anti-vibration rubber 62 and the pressing plate 63 with the sound insulating member 65, the structure on the machine body side (the chassis 202 in the case of FIG. 3), such as the pressing plate 63 and the end of the fastening member 64 on the pressing plate 63 side. It is possible to prevent noise originating from a member fixed without a cushioning material such as the anti-vibration rubber 61 or the anti-vibration rubber 62 from being transmitted to the interior space of the cabin 12. Living comfort is improved.

  In the case of the first embodiment of the cabin of the work vehicle of the present invention shown in FIG. 4, a front center position 71 that is the front end of the cabin 12 and substantially the center of the left and right, and a rear left position 72 that is the rear end and the left end of the cabin 12. The anti-vibration support members 60, 60, 60 are disposed at the rear right position 73, which is the rear end and the right end of the cabin 12, respectively.

  Such a configuration has the following advantages. That is, in the case of the conventional cabin 112 shown in FIG. 8, positions at the four corners of the cabin 112, that is, a front left position 174 that is the front end and the left end of the cabin 112, and a front right position 175 that is the front end and the right end of the cabin 12. Are provided at the rear left position 172 which is the rear end and the left end of the cabin 112 and the rear right position 173 which is the rear end and the right end of the cabin 112, respectively. It was. Therefore, in order to support the front left position 174 that is the front end and the left end and the front right position 175 that is the front end and the right end of the cabin 112, the brackets 302a and 302a that protrude to the left and right sides of the chassis 302 are provided. Anti-vibration support members (not shown) are provided between 302 a and 302 a and the cabin 112. However, since the brackets 302a and 302a are small members as compared with the chassis 302, the generated noise and vibration frequency (frequency) are large, which causes a decrease in the comfortability of the cabin 112.

  On the other hand, in the case of the first embodiment of the cabin of the work vehicle of the present invention shown in FIG. 4, the position where the vibration isolating support member 60 is arranged in the front half of the cabin 12 is the front center and the front center that is substantially the center on the left and right. The vibration isolating support member 60 is directly fixed to the upper surface of the chassis 202. Therefore, it is possible to reduce the vibration and noise propagating from the chassis 202 (the structure on the airframe side) to the cabin 12 through the vibration isolation support member 60 and to reduce the frequency (frequency) of the vibration and noise. Yes, the comfortability of the cabin 12 is improved.

  In the case of the conventional cabin 112 shown in FIG. 8, the cabin 112 is supported at four locations (front left position 174, front right position 175, rear left position 172, rear right position 173) with respect to the aircraft. If the accuracy is not good, the anti-vibration support members 160, 160,... Provided at the four locations may not be located on substantially the same plane. Therefore, even when the tractor 201 is left stationary, the vibration isolating rubber constituting the anti-vibration support member 160 may be distorted in a direction other than the vertical direction (so-called “twisted” state). On the other hand, in the case of the first embodiment of the cabin of the work vehicle shown in FIG. 4, the cabin 12 is supported at three locations (front center position 71, rear left position 172, rear right position 173) with respect to the airframe. The anti-vibration support members 60, 60, 60 provided at the three locations are located on substantially the same plane regardless of the accuracy during assembly. Therefore, when the tractor 201 is left stationary, the vibration isolating rubber (the anti-vibration rubber 61 and the anti-vibration rubber 62) constituting the anti-vibration support member 60 is distorted in a direction other than the vertical direction (a so-called “twisted” state). ) Can be prevented.

  In this embodiment, the anti-vibration support member 60 disposed at the front center position 71 and the anti-vibration support members 60 and 60 disposed at the rear left position 72 and the rear right position 73 are of the same type. However, depending on the load and shape of the cabin 12, the mode of use of the work vehicle, etc., different types may be used. For example, the load applied to the image stabilization support member 60 disposed at the front center position 71 tends to be larger than the load applied to the image stabilization support members 60 and 60 disposed at the rear left position 72 and the rear right position 73 (front center). The load of the cabin 12 tends to concentrate on the vibration isolating support member 60 disposed at the position 71). In such a case, the vibration isolating rubber 61 of the vibration isolating support member 60 disposed at the front center position 71 and Increasing the planar cross-sectional area of the anti-vibration rubber 62 can be mentioned.

  Hereinafter, the detailed configuration of the second embodiment of the cabin of the work vehicle according to the present invention will be described with reference to FIG. The second embodiment of the cabin of the work vehicle of the present invention shown in FIG. 5 is different from the first embodiment of the cabin of the work vehicle shown in FIG. 4 in that the front center position 71, the rear left position 72, and the rear right position 73 are different. In addition to the three locations, the anti-vibration support member 60 is disposed at the middle position 76 that is rearward of the front center position 71, forward of the rear left position 72 and rear right position 73, and substantially at the center of the left and right. . By configuring in this way, it is possible to prevent the load of the cabin 12 from concentrating on the anti-vibration support member 60 provided at the front center position 71.

  Below, the detailed structure of the 3rd Example of the cabin of the working vehicle of this invention is demonstrated using FIG. The third embodiment of the cabin of the work vehicle of the present invention shown in FIG. 6 is different from the first embodiment of the cabin of the work vehicle shown in FIG. 4 in that the front left position 74 and the cabin 12 are the front end and the left end of the cabin 12. The oil dampers 80 and 80 are provided at both the front right position 75 which is the front end and the right end of the front end.

  The oil damper 80 is mainly formed with a cylinder and a hole communicating with the inner peripheral surface of the cylinder in an airtight manner so as to divide the inner space of the cylinder into two and communicate with the inner space divided into the two. A rod provided with a piston is provided, and the movement of the rod protruding from the cylinder or the movement in the immersion direction is attenuated by the viscosity of the oil enclosed in the internal space of the cylinder.

  In the case of the present embodiment, one end (cylinder base) of the oil dampers 80 and 80 is pivotally supported by brackets 202a and 202a provided so as to protrude to the side of the chassis 202, and the oil dampers 80 and 80 are The other end (rod end) is pivotally supported at the front left position 74 and the front right position 75 so as to be rotatable.

  Such a configuration has the following advantages. That is, since the first embodiment of the cabin of the work vehicle shown in FIG. 4 supports the load on the front portion of the cabin 12 at one place in the front center position 71 at the center of the left and right, it is compared with the conventional cabin 112 shown in FIG. In such a case, it tends to be difficult to regulate the movement of the cabin 12 that is excessively tilted (rolled) in the left-right direction with respect to the aircraft. As a method for solving such a problem, it is conceivable to increase the area in plan view of the vibration isolating support member 60 arranged at the front center position 71. However, the second embodiment of the cabin of the work vehicle cabin of the present invention shown in FIG. The problem can be solved by providing the oil dampers 80 and 80 at both the front left position 74 and the front right position 75 as in the third embodiment.

  In this embodiment, the oil dampers 80 and 80 are provided at both the front left position 74 and the front right position 75. However, the oil damper 80 has a damping effect even when the rod slides in either the protruding direction or the immersion direction. Therefore, even if the oil damper 80 is provided in either the front left position 74 or the front right position 75, substantially the same effect can be obtained. Further, a spring that urges the rod in a direction protruding from the cylinder may be provided in the oil damper 80. Further, even if an air damper (a damper that attenuates sliding of the rod by the viscosity of air sealed in the cylinder) is used instead of the oil damper 80 of the present embodiment, substantially the same effect can be obtained.

  Below, the detailed structure of 4th Example of the cabin of the working vehicle of this invention is demonstrated using FIG. The fourth embodiment of the cabin of the work vehicle of the present invention shown in FIG. 6 differs from the first embodiment of the cabin of the work vehicle shown in FIG. 4 in that the front left position 74 and the cabin 12 are the front end and the left end of the cabin 12. The tilt restriction members 90, 90 made of rubber are provided at the front right position 75, which is the front end and the right end of. Here, unlike the “anti-vibration support member”, the “tilt regulating member” is a member that functions to regulate the cabin so that the cabin does not tilt more than a predetermined tilt angle in the left-right direction of the aircraft. The tilt regulating members 90 and 90 are fixed to brackets 202a and 202a provided so as to protrude to the side of the chassis 202, respectively. The tilt regulating members 90 and 90 do not contact the front left position 74 and the front right position 75 of the cabin 12 when the tractor 201 is placed on a flat place, and the cabin 12 is in the lateral direction of the aircraft with respect to the aircraft. The size and the positional relationship are determined so that the front left position 74 and the front right position 75 are brought into contact with each other when the tilt is greater than a predetermined tilt angle. Since the tilt restricting members 90 and 90 are made of rubber, even when the cabin 12 abruptly contacts the tilt restricting members 90 and 90, the tilt of the cabin 12 can be restricted while buffering the impact.

  Such a configuration has the following advantages. That is, since the first embodiment of the cabin of the work vehicle shown in FIG. 4 supports the load on the front portion of the cabin 12 at one place in the front center position 71 at the center of the left and right, it is compared with the conventional cabin 112 shown in FIG. In such a case, it tends to be difficult to regulate the movement of the cabin 12 that is excessively tilted (rolled) in the left-right direction with respect to the aircraft. As a method for solving such a problem, it is conceivable to increase the area in plan view of the vibration isolating support member 60 disposed at the front center position 71. However, the second embodiment of the cabin of the work vehicle cabin of the present invention shown in FIG. The problem can be solved by providing the tilt restricting members 90 and 90 at the front left position 74 and the front right position 75 as in the fourth embodiment.

  In this embodiment, the tilt regulating members 90 and 90 are fixed to the airframe (more precisely, the brackets 202a and 202a as the structural body on the airframe side), and when the cabin 12 tilts, the cabin 12 (more precisely, the cabin) The tilt-restricting members 90 and 90 are fixed to the cabin 12 (more precisely, the front stays 27 and 27 as the structure on the cabin 12 side). However, when the cabin 12 is tilted, substantially the same effect can be obtained by a configuration in which the cabin 12 abuts against the airframe (more precisely, the brackets 202a and 202a which are structural bodies on the airframe side).

The left view of a tractor. The perspective view which shows the frame group of a cabin. Side surface sectional drawing of a vibration proof support member. The schematic diagram which shows the 1st Example of the cabin which concerns on this invention. The schematic diagram which shows the 2nd Example of the cabin which concerns on this invention. The schematic diagram which shows the 3rd Example of the cabin which concerns on this invention. The schematic diagram which shows 4th Example of the cabin which concerns on this invention. The schematic diagram which shows the conventional cabin.

12 cabins (work vehicle cabins)
71 Front center position 72 Rear left position 73 Rear right position 60 Anti-vibration support member 201 Tractor (work vehicle)

Claims (3)

A cabin (12) of a work vehicle having an anti-vibration support member (60) interposed between the tractor (201) and the front center position at the front end of the cabin (12) and substantially in the center of the left and right (71), left position (72) after the rear end and the left end of the cabin (12), and, right position (73) after the trailing end and the right end of the cabin (12), respectively only the three positions of the A cabin of a work vehicle, wherein the anti-vibration support member (60) is disposed.   The cabin of a work vehicle according to claim 1, wherein any one of a front left position (174) serving as a front end and a left end of the cabin (12) and a front right position (175) serving as a front end and a right end of the cabin (12). A work vehicle cabin characterized in that an oil damper (80, 80) or an air damper is provided on one or both.   2. The cabin of the work vehicle according to claim 1, wherein a rubber is provided at a front left position (174) that is a front end and a left end of the cabin (12) and a front right position (175) that is a front end and a right end of the cabin (12). The tilt restricting member (90, 90) is provided, and the tilt restricting member (90, 90) is fixed to either the cabin (12) or the aircraft, and the cabin (12) is attached to the aircraft A cabin of a work vehicle characterized by contacting the cabin (12) and an unfixed side of the machine body when tilted more than a predetermined tilt angle in the left-right direction of the machine body.

Images