JP4814742B2 - Tractor - Google Patents

Description

The present invention relates to a tractor configured to provide vibration-proof support for a front side of a cabin to a traveling machine body .

  Anti-vibration support is provided for the cabin on the traveling machine body by arranging anti-vibration mechanisms at four locations on the front and rear of the frame constituting the cabin. The structure of the cabin is as follows. That is, while extending the support bracket (publication number 13) from the left and right sides of the mission case (publication number 3) belonging to the traveling machine body side, the vibration isolation support body (as a vibration isolation body) Publication number 24) and a cover body (publication number 25) as a linked member attached to the cabin (publication number 15). (See Patent Document 1).

Japanese Patent Laid-Open No. 61-129373 (Gazette 2, page 2, lower left column, line 10 to lower right column, fourth line, and FIGS. 1 and 2)

As described above, when a displacement occurs when the cover provided on the cabin side is put on the anti-vibration support main body provided on the traveling machine body side, the anti-vibration support main body remains in a deformed state. There is a possibility that the vibration-proof support main body and the cover body are connected by the bolt.
If the anti-vibration support main body is connected and fixed while being deformed, the anti-vibration support main body does not sufficiently function and there is a possibility that generation of vibration noise cannot be suppressed. In addition, since the vibration cannot be reduced, the operation rod and the like are easily twisted, and there is room for further improvement.

An object of the present invention is to provide a tractor in which a member on a cabin side and a member on a traveling machine body can be connected with no vibration while sandwiching a vibration isolator.

〔Constitution〕
According to the first aspect of the present invention, the floor plate is connected to the left and right lower side members of the cabin frame, and the rear side of the front portion of the floor plate is recessed to avoid the handle post. Forming a U-shaped recessed frame portion in a plan view,
Left and right mounting brackets are extended from the transmission case to the side of the aircraft, and each of the left and right mounting brackets is connected to the transmission case in an upright posture, and the mounting plate from the mounting plate. And a flat plate portion that extends horizontally in a cantilevered manner toward the lateral side,
Each of the left and right anti- vibration bodies that support the anti-vibration of the lower surface side of the floor plate is more than the outer end of the flat plate portion so that the body inner portion of the anti-vibration body overlaps the recessed frame portion in plan view. Arranged at a position near the mounting plate portion, placed on the upper surface of the flat plate portion, and bolted,
Each of the left and right guide pins attached to the left and right mounting brackets is positioned at the laterally outer side of the anti-vibration body in the flat plate portion and at the laterally inner side of the front side of the step portion of the lower side member. In the arrangement to be screwed detachably downward from the lower side of the flat plate portion,
The left and right guide holes formed in the floor plate are engaged with the rod-shaped guide portions of the left and right guide pins, and the left and right vibration isolator and the floor plate are fastened and connected with fastening bolts, The front side is configured to be supported by vibration isolation on the traveling machine body, and the operation and effect thereof are as follows.

[Function and effect ]
Since the left and right guide pins and the left and right guide holes as the positioning guide mechanism is provided, this moving the front side of the cabin with respect to the right and left vibration insulating member in the direction in which the positioning guide mechanism for guiding You can.

Further, when mounting the cabin vehicle body, if the operation of fitting the guide pin into the guide hole, Ru can be positioned in the front portion of the cabin with respect to the left and right isolator.

Further , after the left and right vibration isolator and the floor plate are tightened and connected by the fastening bolts , it is necessary to release the linked state between the guide pin and the guide hole to ensure a free operation state of the vibration isolator. The guide pins that need to be released after Thus linked, since from isolator is disposed in the machine body transverse outward, can be easily performed from the outside of the also traveling machine body Installing removing operation with respect to the guide pin.

Further, since the guide pin is removed under the mount bracket, the guide pin can be removed in a state where a sufficient working space is secured with less equipment congestion.

〔Constitution〕
According to a second aspect of the present invention, there is provided a characteristic configuration according to the first aspect, wherein the guide pin includes a head disposed below the lower surface of the flat plate portion and a screw screwed to the flat plate portion. A circular rod-shaped portion having a smaller diameter than the screw portion formed at the upper end of the screw portion, and the rod-shaped guide portion having a smaller diameter than the circular rod-shaped portion formed at the upper end of the circular rod-shaped portion. In addition, the guide hole is smaller in diameter than the circular rod-shaped portion and larger in diameter than the rod-shaped guide portion.

In Figure 1 there is shown a whole side surface of the tractor to the main work tilling耘作industry, this tractor, the power from the engine 2 which is anti-vibration mounted to the front frame 1A constituting the vehicle body 1, frame combined The four-wheel drive type is transmitted to a pair of left and right front wheels 4 and rear wheels 5 via a traveling transmission system comprising a traveling transmission (not shown) and the like installed in the transmission case 3.

  As shown in FIGS. 1 and 2, a pair of left and right lift arms 6, which are driven to swing up and down by the operation of a hydraulic lifting cylinder (not shown) housed in the upper portion, are disposed at the rear of the transmission case 3. And a power take-out shaft 7 that allows the engine power to be taken out to the outside.

  The power take-off shaft 7 is a work in which the power from the engine 2 is composed of a work transmission (not shown), a work clutch (not shown), etc., which are housed in a transmission case 3 separate from the traveling transmission system. It is transmitted through the transmission system.

  Although not shown, the left and right lift arms 6 are connected to a link mechanism that is connected to the rear portion of the transmission case 3 so as to be movable up and down, and the power take-out shaft 7 is connected to a rotary mechanism connected to the link mechanism. An input shaft provided in a working device such as a tillage device is connected via a transmission shaft or the like.

  As shown in FIG. 1 and FIG. 2, a boarding operation unit 10 is formed in the rear half of the traveling machine body 1 with a steering wheel 8, a driver seat 9, and the like, and a cabin 11 that covers the boarding operation unit 10 is equipped. ing.

  As shown in FIG. 1, the cabin 11 includes a cabin frame 19 that includes a windshield 20 made of transparent curved glass, a pair of left and right door panels 21 made of transparent flat glass, a transparent curved glass, and the like. And a pair of left and right side windows 22 of an outward opening type and an outward opening type rear window 23 made of a transparent curved glass or the like.

As shown in FIGS. 1, 6 and 7, the cabin frame 19 includes a pair of left and right front pillars 24 made of deformed pipes, a pair of left and right quarter pillars 25, a pair of left and right rear pillars 26 made of square pipes, and a cross-sectional shape. A U-shaped front cross member 27, a pair of left and right side members 28 having a U-shaped cross-section, a rear cross member 29 having a U-shaped cross-section, a lower side member 12, and left and right lower side members 12, 12. over constituted by welding or the like off the lower plate 13 that have been provided.

As shown in FIGS. 6 and 7, the lower side members 12, step portion 12c, right and left side parts 12a exhibiting a circular arc shape along the rear wheel fenders 80 from step portion 12c, and a position above the step portion 12c The rear portion 12b is integrally formed.
An inner roof 30 and an outer roof 31 are attached to the front cross member 27, the left and right upper side members 28, and the rear cross member 29 to form a roof portion 32.

As shown in FIG. 1, the left and right door panels 21 are connected to corresponding quarter pillars 25 via a pair of upper and lower hinges 33 so as to be able to open and close.
The left and right side windows 22 are connected to corresponding rear pillars 26 via a pair of upper and lower hinges 34 so as to be openable and swingable.
As shown in FIG. 1, the rear window 23 is connected to a rear cross member 29 via a pair of left and right hinges 35 so as to be capable of opening and closing.
The left and right rear pillars 26 are set so that the distance between them is narrower than the distance between the left and right front pillars 24 and the distance between the left and right quarter pillars 25.

  The rear cross member 29 is arranged and set at a height position lowered by a predetermined distance from the upper ends of the left and right rear pillars 26 in order to secure an arrangement space for the air conditioning unit 36 between the rear roof member 31 and an air conditioner at the upper part thereof. Three support stays 37 for supporting the unit 36 are provided.

  As shown in FIGS. 1, 3, and 4, the inner roof 30 is joined to the lower surface of the front cross member 27, the left and right side members 28, and the rear cross member 29. In order to widen the living space as much as possible while securing a space for air conditioning duct arrangement between the outer roof 31 and the outer roof 31, the central portion is formed in a shape that bulges toward the outer roof 31.

  As shown in FIGS. 1, 3 and 4, the outer roof 31 is supported by the upper surfaces of the front cross member 27 and the left and right side members 28, and has an outside air introduction path 38 at the front and rear intermediate portions thereof. In addition, the rear end portion extends rearward from the rear window 23 and functions as an upper cover that covers the upper portion of the air conditioning unit 36.

  As shown in FIGS. 1 to 4, a lower cover 39 that covers the rear lower portion of the air conditioning unit 36 is connected to the outer roof 31 and the support stay 37, and the rear end portion of the inner roof 30, the rear portion of the outer roof 31, and the lower cover 39. Thus, a storage space 40 for the air conditioning unit 36 is formed.

As shown in FIGS. 2 to 5, a pair of left and right inside air supply ports 41 that allow supply of cabin inside air to the air conditioning unit 36 are formed in the center of the rear portion of the inner roof 30.
In the center of the rear part of the outer roof 31, a pair of left and right outside air supply ports 42 that allow the supply of outside air to the air conditioning unit 36 are formed facing the inside air supply port 41 of the inner roof 30.

As shown in FIGS. 1 and 2, a pair of left and right rods 43 that prevent rainwater from entering the cabin when the left and right side windows 22 are opened are formed at the rear of the outer roof 31.
The left and right saddles 43 are formed in a hollow shape communicating with the outside air introduction path 38, and the outside air introduction port 44 is formed only on the bottom wall of the left side saddle 43, and an air filter 45 is provided.
In this way, the outside air inlet 44 is formed only in the left ridge 43 and the air filter 45 is provided, so that when the air filter 45 is cleaned or replaced in the field, the left side of the vehicle body is adjacent to the ridge. If the vehicle body is stopped in such a state, the air filter 45 can be cleaned or replaced on the eaves that can easily reach the eaves 43 as soon as it gets off the eaves from the left entrance and exit.

  As shown in FIGS. 2, 4, and 5, the outside air supply port 42 is opened between the inside air supply port 41 and the outside air supply port 42 to allow the outside air to be supplied to the air conditioning unit 36, and the inside air supply The outside air mixing state in which the opening area of the opening 41 is reduced to suppress the supply of the cabin inside air from the inside air supply port 41, and the outside air supply port 42 is closed to prevent the outside air from being supplied to the air conditioning unit 36 and the inside air supply port A vertically swinging shutter 46 configured to be switched to an inside air circulation state in which 41 is largely opened is provided.

  As shown in FIGS. 2, 4 and 5, the shutter 46 is an electric shaft that swings up and down around a support shaft 48 that is directed to the left and right by the operation of an electric motor 47, and is a linkage shaft provided at the free end thereof. 49 is linked to the operating arm 53 of the electric motor 47 through a crank arm 51 that swings around a fulcrum pin 50 that faces in the front-rear direction and a connecting wire 52, and is returned to the inside air circulation state by a spring (not shown). It is energized.

  As shown in FIGS. 2 and 3, the air conditioning unit 36 includes a sirocco fan 57 and an evaporator in a casing 56 in which an air intake portion 54 is opened at an upper right portion and a pair of left and right pipe-shaped blowout portions 55 are formed at a front portion. 58, a heater 59, and the like, and are supported by the respective support stays 37 so that the rear end portion thereof is positioned rearwardly larger than the rear window 23 of the cabin 11 between the left and right rear pillars 26, 26. As a result, the entirety is positioned behind the driver seat 9.

  As shown in FIGS. 2 and 3, the arrangement of the air conditioning unit 36 allows the living space to be reduced while making the overall height of the cabin 11 as low as possible as compared with the case where the air conditioning unit 36 is arranged at the front end portion of the roof portion 32. It is possible to secure a large air conditioning unit 36 having a high capacity, and it is possible to equip with a large capacity air conditioning unit 36. Further, since the field of view to the front and upper side is widened, for example, a front loader (not shown) is connected and equipped. During loader work, it is easy to visually recognize the raised bucket position, and workability is improved.

  As shown in FIGS. 2 and 3, the sirocco fan 57 is arranged on the right side of the evaporator 58, and unadjusted air taken in from the intake portion 54 is transferred between the evaporator 58 and the rear wall 60 of the casing 56 facing the evaporator 58. Then, the air is supplied to the evaporator 58 and the heater 59 through the air supply path 61 formed in the above.

  As shown in FIGS. 2 and 3, the rear wall 60 of the casing 56 is separated from the sirocco fan 57 so as to function as a guide wall that guides the unadjusted air from the sirocco fan 57 substantially uniformly throughout the evaporator 58. The left end side is formed in a multi-stage shape approaching the evaporator 58.

  Thus, by forming the rear wall 60 of the casing 56 in a multistage shape, a relatively large space 62 is formed between the outer surface of the left end portion of the rear wall 60 and the rear wall surface of the roof portion 32. It will be.

  Therefore, by effectively utilizing this space, the rear wall 60 of the casing 56 is equipped with an electric motor 47 for operating the shutter, thereby forming a dedicated space for housing the electric motor 47. It is possible to avoid complication of the part shape and enlargement of the roof part 32.

  Further, since the sirocco fan 57 is disposed on the right side of the evaporator 58, the sirocco fan 57 is positioned at the right end opposite to the outside air introduction port 44 formed at the left end of the outer roof 31, thereby In the mixed state, the outside air introduced from the outside air introduction port 44 is supplied to the evaporator 58 and the heater 59 through the outside air introduction path 38 and the air supply path 61 while being preheated at the internal temperature of the cabin 11. Therefore, compared with the case where the sirocco fan 57 is disposed in the vicinity of the outside air introduction port 44, the air conditioning efficiency can be improved.

  As shown in FIGS. 2 and 3, a pair of left and right air-conditioning ducts 63 that guide the adjusted air from the corresponding blowing portions 55 toward the front end portion of the cabin 11 are externally fitted to each blowing portion 55 of the casing 56. ing.

  The left and right air-conditioning ducts 63 are made of a resin molded product formed in a substantially L shape so that their front end portions are in positions close to the front cross member 27 and are substantially along the front cross member 27.

  As shown in FIG. 2, in the middle part of the left and right air conditioning ducts 63, a first air outlet 64 and a second air outlet 65 for blowing the guided adjusted air toward the operator from the front lateral upper side of the operator, Is formed.

  As shown in FIG. 2, at the front end portions of the left and right air conditioning ducts 63, the third air outlet 66 that blows the guided adjusted air downward from the lateral end portion of the front end upper portion of the cabin 11, and the cabin 11. The 4th blower outlet 67 which blows off toward the downward direction from the right-and-left intermediate part of the front end upper part in is formed.

  As shown in FIG. 2, in the left and right air conditioning ducts 63, between the first air outlet 64 and the third air outlet 66, by reducing the flow rate of the regulated air forward from the first air outlet 64, A first restricting portion 73 that secures the flow rate of the regulated air blown from the first blower outlet 64 is formed, and the second blower outlet 65 and the third blower outlet 66 are forward of the second blower outlet 65. A second throttle portion 74 that secures the flow rate of the regulated air blown out from the second outlet 65 is formed by reducing the flow rate of the regulated air.

  With this configuration, the air conditioning unit 36 is arranged at the rear part of the roof portion 32 to improve the comfortability, but the adjusted air is supplied to the driver, the viewing area of the side mirror 72 in the left and right door panels 21, or the window. It becomes possible to preferentially supply to the front view area of the shield 20 and the like, thereby improving the comfort inside the cabin 11, and the front view area of the windshield 20 and the left and right The side mirror viewing area on the door panel 21 can be cleared, and the front confirmation and the rear confirmation by the side mirror 72 can be easily performed. Therefore, the maneuverability and workability can be improved.

  In particular, the first throttle part 73 is located in front of the first outlet 64 and the second throttle part 74 is located in front of the second outlet 65, so that the first outlet 64 and the second outlet 65 are separated. The control air can be blown out rearward toward the pilot.

  As shown in FIGS. 2 and 3, the evaporator 58 is provided with a drainage mechanism A that discharges the condensed water generated in the case. The drainage mechanism A includes a device-side drain hose 65 that discharges condensed water from the evaporator 58, a metal pipe 66 connected to the device-side drain hose 65, and a tip-side drain hose 67 connected to the pipe 66. Consists of.

As shown in FIG. 2 and FIG. 3, the device-side drain hose 65 is formed in a posture that is substantially horizontal along the inner surface of the lower cover 39 and toward the lateral side, and is connected to a metal pipe 66. It is inclined toward the lower front side of the fuselage.
The metal pipe 66 is provided in an inclined posture toward the lower front side of the machine body, and is integrally formed with a bracket that supports the work lamp 84. A blinker 83 is provided in the vicinity of the work lamp 84.

  The front end side drain hose 67 is suspended in a vertical posture between the side window 22 and the rear window 23 along the outer surface of the rear pillar 26, and extends to the position of the rear wheel fender 80 relative to the rear wheel 5. .

  The anti-vibration structure for the cabin 11 will be described. As shown in FIGS. 1, 6, and 7, the anti-vibration structure for the cabin 11 includes the front anti-vibration mechanisms X and X provided near the front end of the cabin 11 and near the left and right steps, respectively, and the rear of the cabin 11. The left and right rear vibration isolation mechanisms Y and Y are supported by the rear axle case 14 near the ends.

As shown in FIGS. 6 and 7, the rear vibration isolation mechanisms Y and Y belonging to the cabin side are mounted on the reinforcing member 71 that is suspended in parallel from the rear portion 12 b of the lower side member 12 in a vertical orientation. 71A is attached, and the anti-vibration rubber on the cabin side of the rear anti-vibration mechanism Y is attached to the mount bracket 71A.

  As shown in FIGS. 6 and 7, the rear vibration isolation mechanisms Y and Y belonging to the traveling machine body side are constituted by vibration isolation rubber attached to a bracket 14 </ b> A erected from the rear axle case 14.

The front vibration isolation mechanism X will be described. As shown in FIGS. 6 and 7, the front vibration isolation mechanism X is provided on both sides of the recessed frame portion 13 </ b> A that avoids the handle post on the floor plate 13 of the cabin 11, and is attached to the downward surface of the floor plate 13. The linked member 16 and the vibration isolator 17 attached to the mount bracket 15 extended from the mission case 3 are configured.

The floor plate 13 is a plate constructed over the left and right step portions 12c, 12c of the lower side member 12. As shown in FIG. 8, a dish-like linked member 16 in which a peripheral opening portion 16A is curved and a downward opening concave portion 16B is formed is attached and fixed to the downward surface of the floor plate 13. The linked member 16 is made of a metal material, but a hard resin material may be used as long as the strength is sufficient.

  A mounting structure of the vibration isolator 17 will be described. As shown in FIGS. 8 and 9, the mount bracket 15 extends from the mission case 3 toward the lateral side of the aircraft. The mounting bracket 15 is provided at one end at the mounting plate portion 15B in the vertical orientation with respect to the transmission case 3, the flat plate portion 15A extending horizontally from the mounting plate portion 15B, and the cantilevered tip of the flat plate portion 15A. The reinforcing plate portion 15C is vertically oriented. A through hole 15a is formed at the center position of the flat plate portion 15A, and screw holes 15b for attachment are formed at four locations on the peripheral edge of the through hole 15a.

  As shown in FIGS. 8 and 9, the mounting bracket 15 is configured such that the mounting plate portion 15 </ b> B and the reinforcing plate portion 15 </ b> C are integrally formed on both side ends of the flat plate portion 15 </ b> A. The mechanical strength is enhanced at both ends of 15A compared to the center position, and the structure is easily bent at the center position of the flat plate portion 15A. As a result, when receiving vibration, the vibration absorption capability is increased at the center position, and the vibration isolator 17 described later is provided at the center position, so that vibration propagation to the cabin 11 is suppressed.

  The vibration isolator 17 attached to the mount bracket 15 is configured by integrally forming a flange portion 17B and a cylindrical body portion 17C on a vibration isolating body 17A. As shown in FIGS. 8 and 9, the vibration isolating body 17A is made of rubber, and the upper portion is formed in a shape having a loose truncated cone shape having a mountain-shaped gentle inclined surface 17a and is inclined. The flange portion 17B described above is formed integrally with the bottom portion of the surface 17a. A portion below the inclined surface 17a of the vibration isolating body 17A is a circular protrusion 17b having a constant height, and a part of the flange portion 17B is bent and inserted into the circular protrusion 17b.

  In order to attach such a vibration isolator 17 to the mount bracket 15, the circular protrusion 17 b is fitted into the through hole 15 a from the upper surface of the mount bracket 15, and the flange portion 17 B is placed on the upper surface, and the bolt a Attach and fix with.

As shown in FIG. 8, the linked member 16 attached to the lower surface of the floor plate 13 is placed on the upper end portion of the inclined surface 17 a of the vibration isolator 17 attached to the mount bracket 15. The body 17 can be assembled.
Even if there is a slight misalignment between the vibration isolator 17 and the linked member 16 by providing the vibration isolator 17 with the inclined surface 17a and forming a curved surface on the peripheral edge portion 16A of the linked member 16. When the curved surface of the peripheral edge portion 16A and the inclined surface 17a are in contact with each other, a function of correcting the positional displacement works, and it is possible to prevent the vibration isolator 17 and the linked member 16 from being assembled in a state of positional displacement. .

As shown in FIG. 8, with the linked member 16 fitted on the vibration isolator 17, a fastening bolt 18A as a fastener 18 is inserted into the cylindrical body portion 17C from the upper surface of the floor plate 13, and the nut 18B is inserted. The vibration isolator 17 and the linked member 16 are assembled by tightening and fixing. That is, the cabin 11 is supported by the traveling machine body in a vibration-proof manner.

  The positioning guide mechanism A for guiding the linked member 16 in the direction in which the linked member 16 is fitted to the vibration isolator 17 will be described. As shown in FIGS. 8 and 9, the positioning guide mechanism A includes a guide pin 70 screwed to the side of the machine body from the through hole 15 a of the mount bracket 15 to which the vibration isolator 17 is attached, and the cabin 11. The guide holes 13B formed in the floor plate 13 are provided for each of the left and right front vibration isolation mechanisms X, X, but are not provided for the rear vibration isolation mechanisms Y, Y. .

As shown in FIGS. 8 and 9, the guide pin 70 forms a bolt-shaped screw portion 70B from a bolt-shaped head portion 70A, and forms a circular rod-shaped portion 70C at one end of the screw portion 70B. A rod-shaped guide portion 70D is formed at the tip of 70C.
Such a guide pin 70 is inserted from below the mount bracket 15, and the screw portion 70 </ b> B is screwed into the screw hole 15 b to project the circular rod-shaped portion 70 </ b> C and the rod-shaped guide portion 70 </ b> D upward from the mount bracket 15.

With the configuration as described above, when the cabin 11 is attached to the traveling machine body, the cabin 11 is mounted from the point in time when the tip protrusion 70d of the rod-shaped guide portion 70D of the guide pin 70 located on the left and right is engaged with the guide hole 13B. By engaging and moving toward the bracket 15, the downward opening concave portion 16 </ b> B of the dish-like linked member 16 can be fitted on the inclined surface 17 a of the vibration isolating body 17 </ b> A.
When the assembly of the linked member 16 and the vibration isolator 17 is completed, the screwed state of the guide pin 70 can be released, and the guide pin 70 can be dropped below the mount bracket 15 and removed.

[Another embodiment]
[1] Although not shown, the guide hole 13B that engages the guide pin 70 has a cone-like shape having an inclined surface that guides the guide pin 70 to the guide hole 13B at the edge of the guide hole 13B. It is provided with a guide body not good.

Whole side view of agricultural tractor Plan view showing an air conditioning unit in the cabin, the air conditioning duct, the in-Na roof Plan view showing the air conditioning unit in the cabin Vertical side view showing the shutter Configuration diagram showing shutter drive crank arm, etc. Plan view showing the internal structure of the cabin Side view showing the lower structure of the cabin Longitudinal side view showing front anti-vibration mechanism and positioning guide mechanism for cabin Exploded side view of front vibration isolation mechanism and positioning guide mechanism

1 Traveling aircraft
3 Mission Case 11 Cabin
12 Lower side member
12c step part
13 Floor plate
13A Recessed frame portion 13B Guide hole 15 Mount bracket
15A flat plate
15B Mounting plate 17 Vibration isolator 18 A Fastening bolt
19 Cabin frame 70 Guide pin
70A head
70B Screw part
70C Round bar
70D Bar-shaped guide part
a Bolt

Claims (2)

A floor plate is connected across the left and right lower side members of the cabin frame, and a U-shaped recessed frame in a plan view is recessed in the rear side to avoid the handle post in the center of the left and right of the front portion of the floor plate. Forming part,
Left and right mounting brackets are extended from the transmission case to the side of the aircraft, and each of the left and right mounting brackets is connected to the transmission case in an upright posture, and the mounting plate from the mounting plate. And a flat plate portion that extends horizontally in a cantilevered manner toward the lateral side,
Each of the left and right anti- vibration bodies that support the anti-vibration of the lower surface side of the floor plate is more than the outer end of the flat plate portion so that the body inner portion of the anti-vibration body overlaps the recessed frame portion in plan view. Arranged at a position near the mounting plate portion, placed on the upper surface of the flat plate portion, and bolted,
Each of the left and right guide pins attached to the left and right mounting brackets is positioned at the laterally outer side of the anti-vibration body in the flat plate portion and at the laterally inner side of the front side of the step portion of the lower side member. In the arrangement to be screwed detachably downward from the lower side of the flat plate portion,
The left and right guide holes formed in the floor plate are engaged with the rod-shaped guide portions of the left and right guide pins, and the left and right vibration isolator and the floor plate are fastened and connected with fastening bolts, A tractor configured to provide vibration-proof support for the front side of the traveling aircraft . The guide pin has a head portion disposed below the lower surface of the flat plate portion, a screw portion screwed into the flat plate portion, and a smaller diameter than the screw portion formed at the upper end of the screw portion. The circular rod-shaped portion and the rod-shaped guide portion having a smaller diameter than the circular rod-shaped portion formed at the upper end of the circular rod-shaped portion, and the guide hole having a smaller diameter than the circular rod-shaped portion and the rod-shaped guide portion. The tractor according to claim 1, which has a large diameter .

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