JP6546033B2 - Tractor - Google Patents

Description

  The present invention relates to a tractor. In particular, it relates to the construction of the steering column of the tractor.

  2. Description of the Related Art A tractor is known that is configured to be able to tilt a steering wheel to a position suitable for an operator. Patent Document 1 discloses this type of tractor. In the tractor of Patent Document 1, the steering column can be tilted in the longitudinal direction of the machine with the lower pivot shaft (tilt shaft) as an axis.

JP, 2010-202005,

  Although the configuration of Patent Document 1 does not mention the vibration isolation of parts, it is conceivable to provide a vibration isolation member such as rubber at both ends of the tilt shaft when the steering column is to be vibrated. However, in such a configuration, since the anti-vibration members are disposed in pairs at both ends of the relatively short pivot shaft, the distance between the anti-vibration members tends to be short. Therefore, there is room for improvement in that the tip of the steering column moves largely when the anti-vibration member is slightly deformed, and the behavior of the steering wheel or the like becomes unstable.

  The present invention has been made in view of the above circumstances, and an object thereof is to improve the vibration isolation of a steering column and to make steering operation more comfortable.

Means and effect for solving the problem

  The problem to be solved by the present invention is as described above, and next, means for solving the problem and its effect will be described.

According to an aspect of the present invention, a tractor having the following configuration is provided. That is, this tractor includes a steering column, a bracket, an elastic member, and a support member . The bracket supports the steering column and has a tilt mechanism. The bracket is fixed to the support member. And the said bracket is provided with a base member and a movable member. The movable member is rotatably mounted on an upper portion of the base member about a rotation axis. The lower end portion of the steering column is fixed to the upper portion of the movable member. The elastic member is disposed between the base member and the movable member, and exerts an elastic force on the movable member to resist falling of the movable member by gravity. The support member integrally includes a front surface portion, a pair of left and right side surface portions, and a pair of left and right bent portions, and upper side vibration isolation between the front surface portion and the front attachment portion of the base member A rubber is provided, and a lower anti-vibration rubber is provided between the bent portion and the lower attachment portion of the base member.

Thus , the upper vibration isolation rubber is provided between the front surface of the support member and the front attachment portion of the base member, and the lower vibration isolation is provided between the bent portion of the support member and the lower attachment portion of the base member. Since the rubber is provided, the anti-vibration property of the steering column is enhanced. Furthermore, since the elastic member is disposed between the base member and the movable member, and the elastic member absorbs the vibration generated in the bracket, it is possible to further improve the anti-vibration property. As a result, the steering operation can be performed comfortably. Also, since the elastic member exerts an elastic force on the movable member to resist the movable member from falling down due to gravity, a small force is applied when the steering column is tilted in the direction opposite to the direction in which the gravity works. Can change the direction of the steering column.

In the above-described tractor, it is preferable that the distance between the upper side vibration-proof rubber and the lower side vibration-proof rubber be set larger than the diameter of the bottom surface of the steering column .

This makes it possible to reduce the movement of the bracket caused by the deformation of the anti-vibration rubber, as compared with the case where the plurality of anti-vibration rubbers are arranged adjacent to an extent smaller than the diameter of the bottom surface of the steering column. Vibration damping of the steering column is enhanced. As a result, the steering operation can be performed comfortably.

BRIEF DESCRIPTION OF THE DRAWINGS The left view which shows the whole structure of the tractor which concerns on one Embodiment of this invention. The perspective view which shows the structure of a tractor. The perspective view which shows a mode that a transmission case, a steering column, and a dashboard are arrange | positioned in a cabin. The left view which shows a part of interior of a cabin. FIG. 2 is a perspective view showing the configuration around a transmission case, a steering column, and a dashboard. The left view which shows the structure around a transmission case, a steering wheel, and a dashboard. The left side view showing the composition around a steering column and a bracket. FIG. 2 is a perspective view showing a configuration around a steering column and a bracket. Left side view of the bracket. FIG. The perspective view which shows arrangement | positioning of the anti-vibration rubber with respect to a bracket. The perspective view which shows the appearance of a support member and a bracket in the tractor of specification with a low position of a steering column. The perspective view which shows the appearance of a support member and a bracket in the tractor of specification with a high position of a steering column. The disassembled perspective view which shows the attachment structure of a dashboard. The perspective view which shows a mode that a supporting member is attached to a fuel tank cover. The perspective view which shows the structure of a dashboard. The perspective view which shows a mode that the dashboard is attached to the fuel tank cover via the support member. The perspective view which shows the tractor of another specification with which a dashboard is directly attached to a fuel tank cover.

  Next, embodiments of the present invention will be described with reference to the drawings. First, the configuration of a tractor 100 according to an embodiment of the present invention will be briefly described. FIG. 1 is a left side view showing the overall configuration of the tractor 100. As shown in FIG. In the following description, “left”, “right” and the like mean the left and the right in the direction in which the tractor 100 advances.

  A tractor 100 as a working vehicle for agricultural work shown in FIG. 1 is configured to be able to mount various work devices such as plows and loaders as needed, and to perform various types of work.

  As shown in FIG. 1, the tractor 100 includes an airframe (vehicle body) 2, a pair of left and right front wheels 3, and a pair of left and right rear wheels 4. The front wheels 3 support the front of the vehicle 2, and the rear wheels 4 support the rear of the vehicle 2.

  A bonnet 9 is disposed at the front of the fuselage 2 of the tractor 100, and the bonnet 9 is configured to be openable and closable so that the inside can be exposed. The bonnet 9 is formed in a streamlined shape, and its front portion is formed to be thinner in the vertical direction and in the horizontal direction as it approaches the front. With this shape, reduction in air resistance during traveling and improvement in design are realized.

  In the bonnet 9, a part of the fuel tank 19 and the engine 5 are accommodated. Further, in front of the engine 5, a fan shroud 110, a radiator 111, a condenser 112, an engine control unit (ECU) 113, an air cleaner 114, and a battery 115 are disposed. The fan shroud 110, the condenser 112, the engine control unit (ECU) 113, the air cleaner 114, and the battery 115 are disposed in the above order from the rear to the front on the upper side of the unillustrated mounting plate fixed to the engine frame 16. All are accommodated in the bonnet 9.

  The fuel tank 19 is disposed at the top of the engine 5. The fuel tank 19 has an oil inlet 19a at the top, from which oiling is performed. As this oiling port 19a is arranged to protrude from the hole provided in the upper part of the bonnet 9 as shown in FIG. 1, the operator can perform the oiling operation regardless of the open / close state of the bonnet 9 It is possible.

  Further, as shown in FIG. 1, the front portion 19 b of the fuel tank 19 is disposed above the engine 5 in the internal space of the bonnet 9. Further, a rear portion 19 c of the fuel tank 19 is covered by a fuel tank cover 30 and disposed inside a dashboard 50 provided in the cabin 6.

  The engine 5 is configured as a common rail type diesel engine having a plurality of cylinders. Specifically, the engine 5 includes a common rail (not shown) for storing the fuel supplied from the fuel tank 19 at high pressure. The fuel supplied from the common rail is injected into a combustion chamber in the cylinder by an injector (not shown) arranged for each cylinder.

  The fan shroud 110 is configured to cover the outer periphery of a cooling fan driven by the engine 5 and disposed in front of the engine 5. On the upper right side of the fan shroud 110, a notch (not shown) for passing members such as the intake pipe 116 of the engine 5 is provided. Further, the fan shroud 110 is configured to divide the inner section of the bonnet 9 back and forth. Therefore, heat from the engine 5 can be shielded with respect to a device (the radiator 111, the condenser 112, etc.) disposed in front of the fan shroud 110.

  The radiator 111 is a device for cooling the cooling water in the water jacket of the engine 5 and is attached to the front side of the radiator 111. A circulation path, not shown, for circulating cooling water is formed between the radiator 111 and a water jacket, not shown, formed on the engine 5. The cooling water in the water jacket, which has become hot due to the heat generation of the engine 5, is sent to the radiator 111. The cooling water is cooled by the outside air taken in from the front grill (not shown) when passing through the radiator 111, and then returned to the water jacket again to cool the engine 5.

  The condenser 112 is configured as a heat exchanger, and is configured of a tube through which high-pressure liquid refrigerant used in an air conditioner for air conditioning the cabin 6 passes and a corrugated or plate type around the tube. The fins are provided as main components. The capacitor 112 is supported by a capacitor frame (not shown) and attached to the front side of the radiator 111.

  The ECU 113 is configured as a small computer. The ECU 113 controls the operation of the engine 5 by issuing a control command for controlling the fuel injection amount, the fuel injection timing, and the like based on information from various sensors attached to the engine 5.

  The air cleaner 114 has a configuration in which an air cleaner element for removing foreign matter in the air is accommodated inside. The air cleaner 114 is connected to the engine 5 by an intake pipe 116 and constitutes a part of the intake structure of the engine 5.

  The battery 115 supplies power to various electric components (for example, a cell motor of the engine 5, a headlight of the tractor 100, the ECU 113, etc.) of the tractor 100.

  As shown in FIG. 1, a cabin 6 for mounting by an operator is installed at the rear of the airframe 2. Inside the cabin 6, a steering handle 7 for the operator to steer, a driver's seat 8 on which the operator sits, and various operation devices for performing various operations are provided.

  As the above-mentioned operation device, for example, an operation panel 10 and the like disposed in front of the steering wheel 7 can be mentioned. The operation panel 10 is fixed to a dashboard 50 disposed in front of the steering wheel 7. On the operation panel 10, instruments such as a speedometer, a fuel meter, a distance meter, and the like indicating information necessary for traveling the tractor 100 are disposed.

  An airframe frame constituting a frame of the airframe 2 includes an engine frame 16 and a transmission case 18. A front axle case 17 is attached to the lower side of the engine frame 16. The front wheel 3 is attached to the front axle case 17 via the front axle 130. A rear wheel 4 is attached to the transmission case 18 via a rear axle 14. The upper portions of the left and right rear wheels 4 are covered by the left and right rear fenders 121.

  As shown in FIG. 6, the engine frame 16 and the transmission case 18 are each formed in an elongated shape, and both are arranged such that the longitudinal direction thereof is in the front-rear direction. The transmission case 18 is fixed to the rear end of the engine frame 16 via an appropriate fixing member. As described above, the engine frame 16 is supported by the front wheels 3 via the front axle case 17 and the front axle 130, and the transmission case 18 is supported by the rear wheels 4 via the rear axle 14. Thus, the front wheel 3 and the rear wheel 4 support an airframe constituted by the engine frame 16 and the transmission case 18.

  The transmission case 18 decelerates the power from the engine 5 and transmits it to the front axle case 17 and the rear axle 14. When the operator operates a shift operation tool (not shown), the transmission gear ratio in the transmission case 18 can be changed, and the traveling speed of the tractor 100 can be adjusted.

  As shown in FIG. 2, the PTO shaft 118 is disposed so as to protrude from the rear end of the transmission case 18, and the driving force of the engine 5 is transmitted to the PTO shaft 118. The tractor 100 is configured to be able to mount the above-described working device at its rear end. The PTO shaft 118 can drive the working device via a universal joint or the like (not shown).

  The tractor 100 configured in this way can perform various operations such as tilling, sowing, and harvesting while traveling in a paddy field.

  Next, with reference to FIG. 2 etc., the arrangement configuration of the dashboard 50 of the present embodiment and the steering column disposed behind it will be briefly described. FIG. 2 is a perspective view showing the configuration of the tractor 100. As shown in FIG.

  As shown in FIG. 2, the dashboard 50 of the present embodiment is attached to the rear of the bonnet 9 and at the center on the front side inside the cabin 6. The dashboard 50 is attached so as to cover the fuel tank cover 30 that covers the rear portion 19 c of the fuel tank 19 (details will be described later).

  At the rear of the dashboard 50, a cover (steering column cover 123) covering the steering column 11 is installed. A steering wheel 7 is disposed above the steering column cover 123 and obliquely above the dashboard 50.

  The rear portion of the dashboard 50 is formed to surround the front side of the steering column cover 123 disposed at the center between the left and right. The steering column cover 123 is arranged such that its front portion is partially embedded in the rear of the dashboard 50. As a result, it is possible to realize the compactness of the operation unit composed of the steering wheel 7 attached to the dashboard 50 and the steering column cover 123, and to secure a large space for the operator.

  As shown in FIG. 3 and FIG. 4, the cabin 6 is provided with a skeleton-like cabin frame 122. The cabin frame 122 is fixed to a transmission case 18 provided in the tractor 100. The steering column 11 is supported and fixed by a cabin frame 122.

  Specifically, as shown in FIG. 5, the cabin frame 122 is fixed to the left and right sides of the transmission case 18 via a pair of left and right frame fixing members 132 (however, in FIG. 5, the right frame is fixed) Only member 132 is shown). The frame fixing member 132 is substantially L-shaped, and includes a plate-like transmission case attachment portion 132a and a plate-like frame attachment portion 132b. The transmission case attachment portion 132a is disposed with its thickness direction facing the left and right direction of the machine, and is attached to the side surface of the transmission case 18 via a bolt or the like. On the other hand, the frame attachment portion 132b is disposed with its thickness direction directed in the vertical direction, and is attached to the bottom surface of the bottom plate member 122a so as to support the bottom plate member 122a constituting the cabin frame 122. Thus, the cabin frame 122 is fixed to the transmission case 18 and supported by the rear wheel 4 via the transmission case 18.

  The steering column 11 is fixed to a bracket 20 shown in FIG. 5 (note that the steering column cover 123 is shown in phantom in FIG. 5 in order to show the steering column 11 for clarity). A frame plate member 134 is fixed to the cabin frame 122 by a bolt or the like, and the bracket 20 is fixed to the above-described frame plate member 134 via a support member 41. As described above, the steering column 11 is supported and fixed to the cabin frame 122 via the support member 41 and the like.

  As shown in FIG. 6, the dashboard 50 of the present embodiment can be applied to tractors of a plurality of different specifications by switching the presence or absence of the dashboard support member 40 described later. The steering column 11 and the steering column cover 123 can also be applied to tractors of a plurality of different specifications by appropriately changing the mounting positions.

  Next, the configuration of the steering column 11 and the bracket 20 disposed in the dashboard 50 will be described with reference to FIGS. 7 and 8. FIG. 7 is a left side view showing the configuration around the steering column 11 and the bracket 20. As shown in FIG. FIG. 8 is a perspective view showing a configuration around the steering column 11 and the bracket 20. As shown in FIG. 7 and 8 show a state in which the dashboard 50 is removed.

  Inside the dashboard 50, an elongated cylindrical steering column 11 is disposed. The steering column 11 is disposed below the steering handle 7 in a direction coincident with the rotation axis of the steering handle 7. The lower end portion of the steering column 11 is supported by a bracket 20.

  The steering column 11 is formed in a hollow shape, and a rod-like steering shaft (not shown) is disposed therein. A steering handle 7 is attached to the top of the steering shaft. The lower portion of the steering shaft is inserted into the steering column 11 and rotatably supported with respect to the steering column 11. On the upper portion of the steering column 11, a reverser lever 12 for operating a forward-backward switching mechanism (not shown) of the tractor 100 is attached. Further, on the steering column 11, a known telescopic device 13 for adjusting the position of the steering wheel 7 in the longitudinal direction of the steering column 11 is disposed.

  The steering handle 7 is configured in the shape of a round handle, and is configured to be able to rotate in both the left and right directions. The rotation of the steering wheel 7 is input to a steering valve unit provided in a power steering apparatus (not shown) via the steering shaft. The steering valve unit switches the supply of hydraulic fluid to the cylinder of the power steering device. Thus, the cylinder is driven to change the direction of the front wheel 3 according to the direction and angle at which the steering handle 7 is rotated, and the traveling direction of the tractor 100 can be changed.

  The reverser lever 12 is disposed on the upper left side of the steering column 11. The reverser lever 12 is attached so as to protrude leftward from the steering column 11, and is configured to be rotatable about an axis that is substantially vertically oriented. The tractor 100 is provided with a reverser switch (not shown) for detecting the operation of the reverser lever 12. In this configuration, when the operator operates the reverser lever 12 forward or backward, the forward / backward switching mechanism (not shown) of the tractor 100 is controlled, and the traveling direction of the tractor 100 can be switched forward or backward There is.

  The bracket 20 supports the steering column 11 to a support member 41 fixed to the engine frame 16 of the tractor 100. The bracket 20 includes a base member 21 and a movable member 22 as shown in FIGS. 7 and 8.

  The base member 21 is attached to the support member 41 via a plurality of (four in the present embodiment) anti-vibration rubbers 42.

  The movable member 22 is attached to the upper portion of the base member 21 via shaft members 26 arranged in a pair of right and left. The movable member 22 is supported so as to be rotatable around an axis of the shaft member 26 (a rotating shaft 27 disposed in the horizontal direction). The rotation shaft 27 corresponds to the tilt shaft of the tilt mechanism provided in the bracket 20. The lower end portion of the steering column 11 is fixed to the upper portion of the movable member 22. In this configuration, by rotating the movable member 22, the steering column 11 and the steering handle 7 can be tilted backward or raised forward (tilt function). By using the above-described tilt mechanism included in the bracket 20 and the handle height adjusting mechanism by the telescopic device 13, the position of the steering handle 7 can be appropriately adjusted in accordance with the physical size of the operator.

  Next, the detailed configuration of the bracket 20 will be described with reference to FIGS. 9 and 10. FIG. 9 is a left side view of the bracket 20. As shown in FIG. FIG. 10 is a perspective view of the bracket 20. FIG.

  As shown in FIG.9 and FIG.10, the base member 21 with which the bracket 20 is provided is comprised as a plate-shaped member by which multiple places were bend | folded so that it might become gate shape by a plain view. The base member 21 integrally includes a front attachment portion 21a, a pair of left and right shaft support portions 21b, and a pair of left and right lower attachment portions 21c.

  The front attachment portion 21 a is formed in a plate shape whose thickness is directed in the front-rear direction. An upper portion of the front attachment portion 21 a is attached to the support member 41 via a pair of left and right anti-vibration rubbers 42.

  Each of the pair of shaft support portions 21b is formed in a plate shape whose thickness is directed in the left-right direction. Each of the shaft support portions 21 b extends rearward from the left and right direction both end portions of the front side attachment portion 21 a and then extends downward. The shaft support portion 21 b is connected to the front attachment portion 21 a so as to be vertical in plan view. The pair of shaft support portions 21b are arranged in parallel with each other, and an appropriate space for arranging the movable member 22 is formed therebetween. A shaft member 26 for supporting the movable member 22 is attached to each of the shaft support portions 21 b.

  Each of the pair of lower attachment portions 21c is formed in a plate shape whose thickness is directed in the vertical direction. Each lower mounting portion 21c is arranged to protrude leftward and rightward from the lower end of the pair of shaft support portions 21b. The lower attachment portion 21c is connected to the shaft support portion 21b so as to be vertical in a front view. The pair of left and right lower attachment portions 21 c are attached to the support member 41 via the vibration isolation rubber 42.

  Like the base member 21, the movable member 22 is configured as a plate-like member in which a plurality of places are bent. The base member 21 integrally includes a column attachment portion 22a, a pair of left and right arm portions 22b, and a spring stopper 22c.

  The column attachment portion 22 a is formed in a plate shape whose thickness is perpendicular to the rotation shaft 27 of the movable member 22. The column attachment portion 22a is formed in a rectangular shape, and the lower end portion of the steering column 11 is fixed at the center position thereof by an appropriate method.

  Each of the pair of arm portions 22b is formed in a plate shape whose thickness is directed in the left-right direction. Each of the arm portions 22 b is arranged to extend toward the rotation shaft 27 of the movable member 22 (downward) from both end portions in the left-right direction of the column attachment portion 22 a. The pair of arm portions 22b are disposed in parallel with each other, and the above-mentioned steering valve unit (not shown) is disposed therebetween. Each arm 22 b is rotatably supported on the shaft support 21 b of the base member 21 via the shaft 26. Further, a stopper member 29 is attached to the arm 22b on one side (in the present embodiment, the arm 22b on the right). The stopper member is configured to pass through an arc-shaped long hole 23 formed in a penetrating shape in the shaft support portion 21b of the base member 21 and to protrude to the left and right outside (right side). The angular stroke in which the movable member 22 rotates is limited to a predetermined range by the stopper member 29 and the elongated hole 23.

  The spring stopper 22c is formed in a plate shape which is disposed in a direction perpendicular to both of the column attachment 22a and the arm 22b. The spring stopper 22c is disposed so as to extend downward from the front end of the column attachment 22a.

  As shown in FIG. 10, on one of the left and right sides (in the present embodiment, the left side) of the bracket 20, the angle of the movable member 22 (and, consequently, the angles of the steering column 11 and the steering handle 7) with respect to the base member 21 is a desired angle. A locking mechanism 49 is attached for holding at the same time. The lock mechanism 49 includes a first lock member 51, a second lock member 52, and a lock release lever 53.

  The first lock member 51 is formed in an elongated plate shape, and is fixed to the inner surface of the arm portion 22 b on one side (left side in the present embodiment) of the movable member 22. Therefore, the first lock member 51 rotates around the rotation shaft 27 integrally with the movable member 22. An arc-shaped gear 54 is formed at the lower end portion of the first lock member 51.

  The second lock member 52 is formed in an elongated plate shape, and is disposed in the vicinity of the inner surface of the shaft support portion 21 b on one left and right side (left side in the present embodiment) of the base member 21. One end (front end) of the second lock member 52 is rotatably supported via a support shaft 56 attached to the shaft support portion 21 b. At the other end (rear end) of the second lock member 52, a rectangular cam hole 58 for accommodating the cam plate 57 connected to the lock release lever 53 is formed. Further, gear teeth 55 capable of meshing with the arc-shaped gear 54 of the first lock member 51 are formed at an upper edge of a longitudinal middle portion of the second lock member 52. Further, a round rod-shaped restricting shaft 59 is fixed to the second lock member 52, and one end of a coiled spring 68 is attached to the restricting shaft 59. The spring 68 is configured as a tension spring, and exerts a spring force in a direction to bring the second lock member 52 close to the first lock member 51 (a direction in which the gear teeth 55 and the gear 54 are meshed, specifically, upward). Let The restricting shaft 59 protrudes so as to pass through an elongated hole 67 formed in a penetrating shape in the left side shaft support portion 21b, and the moving stroke of the second lock member 52 is made by the restricting shaft 59 and the elongated hole 67. Is limited to a predetermined range.

  The unlocking lever 53 is rotatably attached to the left shaft support 21 b of the base member 21. The unlocking lever 53 is connected to the triangular cam plate 57 rotatably supported on the inner side of the left shaft support 21b. Therefore, the cam plate 57 can be rotated by the operator pulling up the unlocking lever 53. Further, a return spring 69 in the form of a torsion coil spring is attached to the cam plate 57, and the return spring 69 exerts a spring force in a direction against the operation of pulling up the unlocking lever 53.

  In the above configuration, the gear teeth 55 of the second lock member 52 normally urged upward by the spring 68 mesh with the gear 54 of the first lock member 51, so that the movable member 22 is rotated. Blocked (locked). On the other hand, when the operator pulls up the lock release lever 53, the cam plate 57 rotates and the cam plate 57 pushes down the second lock member 52 through the cam hole 58, so that the gear teeth 55 mesh with the gear 54. The movable member 22 can be rotated (unlocked state).

  A pair of left and right tension springs (elastic members) 28 are provided between the front attachment portion 21 a of the base member 21 and the spring stopper 22 c of the movable member 22. The tension spring 28 moves the movable member 22 in the clockwise direction of FIG. 7 (in other words, in a direction to resist the gravity of the movable member 22 against falling counterclockwise in FIG. 7). The force is applied to the member 22. As a result, when the lock mechanism 49 is unlocked for tilt adjustment of the steering wheel 7, the steering column 11 and the steering wheel 7 can be moved in the direction of raising with a small force. In addition, the vibration generated in the bracket 20 can be alleviated by the tension spring 28, and the anti-vibration property of the steering column 11 can be enhanced.

  Next, the arrangement of the four anti-vibration rubbers 42 attached to the bracket 20 will be described with reference to FIG. FIG. 11 is a perspective view showing the arrangement of the anti-vibration rubber 42 with respect to the bracket 20. As shown in FIG.

  The vibration proof rubber 42 is provided between the support member 41 and the base member 21 of the bracket 20 as shown in FIG. 7. As shown in FIG. 11 and the like, each of the vibration-proof rubbers 42 has a configuration in which a substantially cylindrical rubber body is disposed around a bolt axis. Four circular holes are formed in the base member 21, and ring-shaped grooves formed on the outer peripheral surface of the rubber body are fixed to the respective circular holes. In this state, the bolt shaft is bolted to the support member 41, whereby the bracket 20 can be supported by the support member 41 in a vibration-proof manner.

  Two of the four anti-vibration rubbers 42 are attached to the front attachment portion 21 a of the base member 21 with its bolt axis directed in the front-rear direction. The remaining two are attached to the left and right lower attachment parts 21c with their bolt axes directed vertically. The lower attachment portion 21c is disposed at a lower position than the front attachment portion 21a, so as shown in FIG. 9, two of the four anti-vibration rubbers 42 are disposed relatively high, and the remaining two are relative. Are placed at a low level.

  Furthermore, the upper two of the four vibration-proof rubbers 42 are provided at a position higher than the rotation shaft 27 of the movable member 22 in the bracket 20, and the lower two are lower than the rotation shaft 27. It is provided. Moreover, the difference in height (difference in height of the center point of the rubber body) L1 of the vibration-proof rubber 42 provided at two heights in this manner is larger than the diameter D1 of the bottom surface of the steering column 11. (L1> D1). By arranging the vibration isolation rubbers 42 sufficiently apart from each other in this manner, the bracket 20 due to the deformation of the vibration isolation rubbers 42 as compared with the case where the vibration isolation rubbers are disposed at the tilt fulcrum of the steering column 11 as in the prior art. The movement of As a result, the stability of the bracket 20 is improved, so that the anti-vibration properties of the steering column 11 and the steering handle 7 can be enhanced.

  In addition, as shown in FIG. 11 which is a perspective view of the bracket 20 viewed from the front, the upper two vibration isolation rubbers 42 are disposed at an interval in the left-right direction, and the interval in the left-right direction The distance L2 between the center points of the above is larger than the diameter D1 of the bottom surface of the steering column 11 (L2> D1). Similarly, the lower two vibration isolation rubbers 42 are also spaced apart in the left-right direction, and the distance in the left-right direction (distance between the center points of the rubber bodies) L3 is the diameter D1 of the bottom of the steering column 11. It is larger (L3> D1). Thus, the bracket 20 can be made more stable against vibration by arranging the anti-vibration rubbers 42 apart in the left-right direction as well.

  Furthermore, as shown in FIG. 9, the upper two vibration isolation rubbers 42 and the lower two vibration isolation rubbers 42 are disposed at different positions in the height direction as described above, and also differ in the front-rear direction It is placed in position. Further, although the upper two vibration isolation rubbers 42 and the lower two vibration isolation rubbers 42 have the same configuration, they are arranged so that the directions of the bolt axes are different from each other. Therefore, the bracket 20 can be well damped.

  Next, with reference to FIG. 12 and FIG. 13, the structure which enables fixation of the bracket 20 with respect to the supporting member 41 by two steps of heights is demonstrated. FIG. 12 is a perspective view showing the state of the support member 41 and the bracket 20 in a tractor of a specification in which the steering column 11 is low. FIG. 13 is a perspective view showing the state of the support member 41 and the bracket 20 in a tractor of which the steering column 11 is high. In FIG. 12 and FIG. 13, the shaft member 26 and the lock mechanism 49 and the like are omitted in order to clearly show the fixing structure between the support member 41 and the bracket 20.

  As shown in FIG.12 and FIG.13, the support member 41 to which the bracket 20 is fixed is comprised as a plate-shaped member by which multiple places were bend | folded so that it might become gate shape by a plain view.

  The support member 41 integrally includes a front surface portion 41a, a pair of left and right side surface portions 41b, and a pair of left and right bent portions 41c.

  The front surface portion 41 a is formed in a plate shape whose thickness is directed in the front-rear direction. A plurality of attachment holes 41v for attaching a pair of left and right anti-vibration rubbers 42a are formed in the front surface portion 41a. The position of the mounting hole 41 v corresponds to the circular hole 21 v formed in the front mounting portion 21 a of the base member 21. Further, the mounting holes 41v are arranged in two pairs on the left and right in the front surface portion 41a. In other words, the front side 41a is formed with the upper left and right pair of attachment holes 41v and the lower lower and left pair of attachment holes 41v. The shapes of the four mounting holes 41v and 41w are identical to each other.

  The attachment holes 41v of each pair (pair) are arranged such that the positions in the left-right direction and the front-rear direction are the same as the attachment holes 41v in the other pair (set) and the positions in the vertical direction are different. The upper set of mounting holes 41v and the lower set of mounting holes 41v are arranged to differ in height by L4. The upper set of mounting holes 41 v is formed in the vicinity of the upper end of the support member 41.

  Each of the pair of side surface portions 41 b is formed in a plate shape whose thickness is directed in the left-right direction. Each side surface portion 41b extends rearward from both lateral direction end portions of the front surface portion 41a, and then extends downward and further rearward. The side surface portion 41 b is connected to the front surface portion 41 a so as to be vertical in plan view. The pair of side surface portions 41 b are disposed in parallel with each other, and an appropriate space for disposing the front attachment portion 21 a of the bracket 20 is formed therebetween.

  Each of the pair of bent portions 41c is formed in a plate shape whose thickness is directed in the vertical direction. Each of the bent portions 41c is disposed so as to protrude leftward and rightward from the upper end of the portion extending rearward at the lower end portion of the pair of side surface portions 41b. The bent portion 41c is connected to the side surface portion 41b so as to be vertical in a front view. Each bent portion 41c is formed with a mounting hole 41w for mounting a bolt shaft of the vibration-proof rubber 42b.

  With this configuration, when manufacturing a tractor having a specification in which the position of the steering column 11 is low, the rubber body of the anti-vibration rubber 42b is attached to the circular hole 21w in the pair of left and right lower attachment portions 21c of the bracket 20. The bolt shaft of the anti-vibration rubber 42b is attached to the mounting hole 41w formed in the bent portion 41c of the support member 41 by bolting. Further, the rubber body of the vibration-proof rubber 42a is attached to each of the left and right pair of circular holes 21v in the front side attachment portion 21a of the bracket 20, and the bolt shaft of the vibration-proof rubber 42a is formed on the front surface portion 41a of the support member 41. Of the two sets (four) of mounting holes 41v, the lower set of mounting holes 41v is bolted and attached. By the above, as shown in FIG. 12, the specification in which the steering column 11 is at a relatively low position can be realized.

  On the other hand, in the case of manufacturing a tractor having a specification in which the position of the steering column 11 is high, as shown in FIG. 13, the spacer (attachment member) 43 is fixed to the pair of left and right bent portions 41 c of the support member 41. Do.

  The spacer 43 is configured by appropriately bending a plate member made of metal, and includes a base portion (fixed portion) 43a, an intermediate portion (connection portion) 43b, and a bent portion (parallel portion) 43c. ing.

  The base portion 43a is formed in a plate shape whose thickness direction is directed in the vertical direction. The middle portion 43b is formed in a plate shape whose thickness direction is in the left-right direction, and extends upward from an end portion on the inner side in the left-right direction of the base portion 43a. The bent portion 43c is formed in a plate shape whose thickness is directed in the vertical direction. Each of the bent portions 43c is arranged to protrude leftward and rightward from the upper end of the middle portion 43b. In the bent portion 43c, a mounting hole 43w for mounting the bracket 20 via the vibration-proof rubber 42b is formed.

  The base portion 43a and the bending portion 43c are connected to the middle portion 43b so as to be vertical in a front view. The bent portion 43c and the base portion 43a face each other in parallel, and the difference L5 in height between the upper surface of the bent portion 43c and the lower surface of the base portion 43a is the upper two of the four mounting holes 41v described above. It is equal to the difference L4 in height between one (set) and the lower two (set) (L5 = L4).

  The base portion 43a of the spacer 43 configured as described above is fixed to the upper surface of the pair of left and right bent portions 41c by, for example, a method such as welding (Note that in the specification of FIG. Not used). Thereafter, the rubber body of the vibration-proof rubber 42b is attached to the circular hole 21w in the pair of left and right lower attachment portions 21c of the bracket 20, and the bolt shaft of the vibration-proof rubber 42b is attached to the bent portion 43c of the spacer 43. It attaches by bolting to the formed attachment hole 43w. Further, the rubber body of the vibration-proof rubber 42a is attached to each of the left and right pair of circular holes 21v in the front side attachment portion 21a of the bracket 20, and the bolt shaft of the vibration-proof rubber 42a is formed on the front surface portion 41a of the support member 41. Of the two sets (four) of mounting holes 41v, the upper set of mounting holes 41v is bolted and attached. By the above, as shown in FIG. 13, the specification in which the steering column 11 is at a relatively high position can be realized.

  As described above, according to the configuration of the present embodiment, a plurality of specifications in which the mounting height of the bracket 20 differs in two steps can be realized with a simple configuration. Further, in any specification, the bracket 20 is fixed to the support member 41 at the position near the upper end (the position of the circular hole 21v) and the position near the lower end (the position of the circular hole 21w). It can be stably supported. Furthermore, since the attachment hole 41v used to attach the bracket 20 at a high position is disposed in the vicinity of the upper end of the support member 41, the support member 41 of the bracket 20 is suppressed while suppressing the upward protrusion amount of the support member 41. Thus, it is possible to secure a large range in which the mounting height for the housing can be changed.

  Subsequently, a mounting structure provided in the tractor 100 according to the present embodiment, which enables the dashboard 50 to be mounted at different positions in the vertical direction, will be described with reference to FIGS. 14 to 16. FIG. 14 is an exploded perspective view showing the mounting structure of the dashboard 50. As shown in FIG. FIG. 15 is a view showing how the dashboard support member 40 is attached to the fuel tank cover 30. As shown in FIG. FIG. 16 is a perspective view showing the configuration of the dashboard 50. As shown in FIG.

  As shown in FIG. 14, in the tractor 100 according to the present embodiment, a dashboard 50 is attached to a fuel tank cover 30 that covers the rear 19 c of the fuel tank 19 via a dashboard support member 40. Note that the dashboard 50 can be directly attached to the fuel tank cover 30 without the dashboard support member 40 (details will be described later), and the dashboard support member 40 in FIG. It is drawn with a dashed line.

  The fuel tank 19 is formed of a synthetic resin in a hollow shape and, as shown in FIG. 14, includes a front portion 19b provided with an oil inlet 19a and a rear portion 19c covered by a fuel tank cover 30. Ru. A cover frame 24 to which the fuel tank cover 30 can be attached is provided between the front portion 19 b and the rear portion 19 c. The cover frame 24 may be integrally formed with the fuel tank 19 or may be attached to the fuel tank 19 as a separate part.

  The fuel tank cover 30 includes a cover 30a that covers the rear 19c of the fuel tank 19, and a frame 30b that extends from the edge of the cover 30a. The fuel tank cover 30 is disposed immediately behind the fuel tank 19, and is attached to the cover frame 24 by bolting or the like through the frame portion 30b.

  The cover portion 30 a of the fuel tank cover 30 is formed along the shape of the rear portion 19 c of the fuel tank 19. Moreover, the cover part 30a becomes a shape where the front was open | released. In order to attach the dashboard 50 to the cover 30a, as shown in FIG. 14, the first attachment (attachment) 31, the second attachment 34 and the third attachment 35 are provided on the cover 30a. A fourth attachment portion (operation panel portion attachment portion) 36 and a fifth attachment portion (operation panel portion attachment portion) 37 are formed.

  One first attachment portion 31 is provided on each of the left and right sides of the upper portion of the cover portion 30a. As shown in FIGS. 14 and 15, each of the first attachment portions 31 has a flat portion 31a elongated in a substantially horizontal direction along the front-rear direction of the cover portion 30a. A front attachment portion 32 is provided at one end (front end) of the flat portion 31 a in the longitudinal direction, and a rear attachment portion 33 is provided at the other end (rear end).

  The front mounting portion 32 is formed at the front end of the first mounting portion 31 (the end near the front portion 19 b of the fuel tank 19), and is arranged to project upward from the flat portion 31 a of the first mounting portion 31. It is done. The front attachment portion 32 is formed to have a gate-like shape when viewed in the front-rear direction, as shown in FIG.

  An insertion space 32a is formed inside the above-mentioned gate-shaped portion. Although details will be described later, when the dashboard 50 is attached without the dashboard support member 40, the insertion protrusion 73 (FIG. 16) of the dashboard 50 can be inserted into the insertion space 32a. As shown in FIG. 15, the front attachment portion 32 is formed with a long hole in the front-rear direction, which is elongated in the front-rear direction, for attaching a bolt or the like, and which opens the front end side.

  The rear attachment portion 33 is provided at the rear end of the first attachment portion 31. At the central position in the width direction, there is formed an elongated hole elongated in the front-rear direction for attaching a bolt or the like and opening the rear end side. The rear mounting portion 33 is disposed at a position slightly lower than the front mounting portion 32.

  A dashboard support member 40 functioning as a spacer is attached to the first attachment portion 31 in the first attachment portion 31. The dashboard 50 is configured to be attachable to an upper portion of the dashboard support member 40. . Accordingly, the dashboard 50 can be disposed at a relatively higher position than when the dashboard 50 is directly attached to the first attachment portion 31. The details of the dashboard support member 40 will be described later.

  The second attachment portion 34 is provided on the left and right side surfaces of the fuel tank cover 30 so as to protrude outward in the left-right direction of the fuel tank cover 30 at the front end portion of the lower end portion of the cover portion 30a. The second mounting portion 34 is formed with a long hole which is elongated in the front-rear direction for attaching a bolt or the like and which opens the rear end side.

  The third attachment portion 35 is provided slightly above the second attachment portion 34 on the left and right side surfaces of the fuel tank cover 30 so as to protrude outward in the left-right direction of the fuel tank cover 30. The third mounting portion 35 is formed with a long hole which is elongated in the front-rear direction to attach a bolt or the like and which opens the rear end side.

  Thus, as shown in FIG. 15, the second mounting portion 34 and the third mounting portion 35 are provided on the left and right side surfaces of the fuel tank cover 30 at a predetermined interval in the vertical direction. . The vertical distance between the centers of the long holes formed in the second mounting portion 34 and the third mounting portion 35 depends on whether the mounting position of the dashboard 50 corresponds to the presence or absence of the dashboard support member 40 described above. Is set to match the amount of change.

  The fourth attachment portion 36 is formed on the left side of the fuel tank cover 30 so as to protrude rearward of the fuel tank cover 30. The fourth mounting portion 36 is formed with an insertion hole to which a bolt or the like can be attached.

  The fifth mounting portion 37 is formed on the right side of the fuel tank cover 30 so as to project rearward of the fuel tank cover 30. As shown in FIG. 15, three insertion holes to which bolts and the like can be attached are formed in the fifth attachment portion 37 by arranging in the vertical direction.

  The dashboard support member 40 shown in FIG. 15 is formed of a metal flat member. The dashboard support member 40 includes a rectangular main body 40 a which is oriented so that the thickness direction thereof is the left and right direction. In addition, the dashboard support member 40 includes a first lower attachment portion 45 and a second lower attachment portion 46 provided at the lower edge of the main body 40a, and a first upper attachment portion 47 provided at the upper edge of the main body 40a. And a second upper attachment portion 48.

  The first lower mounting portion 45 and the second lower mounting portion 46 are bent so that small mounting portions extending downward respectively at both ends in the front-rear direction at the lower edge of the main body 40a are perpendicular to the main body 40a It is formed.

  The first lower mounting portion 45 and the second lower mounting portion 46 are directed substantially horizontally (in other words, parallel to the flat portion 31a of the first mounting portion 31 of the fuel tank cover 30). Further, the second lower attachment portion 46 is disposed at a position slightly lower than the first lower attachment portion 45. In the first lower mounting portion 45 and the second lower mounting portion 46, through holes into which bolts or the like can be inserted are respectively formed.

  The distance between the first lower mounting portion 45 and the second lower mounting portion 46 in the front-rear direction is the front-rear direction between the front mounting portion 32 and the rear mounting portion 33 in the first mounting portion 31. It is set to match the distance. Further, the distance between the first lower mounting portion 45 and the second lower mounting portion 46 in the vertical direction is the front mounting portion 32 (upper surface of the front mounting portion 32) and the rear portion of the first mounting portion 31. It is set to coincide with the distance between the mounting portion 33 and the vertical direction. Thus, since the positional relationship between the attachment parts corresponds, the dashboard support member 40 can be securely attached to the first attachment part 31 at two places.

  Then, with the first lower mounting portion 45 placed on the front mounting portion 32 and the second lower mounting portion 46 placed on the upper surface of the rear mounting portion 33, the through hole of the first lower mounting portion 45 The long hole of the front mounting portion 32 of the first mounting portion 31 is bolted, and the long hole of the rear mounting portion 33 is bolted to the through hole of the second lower mounting portion 46. Thereby, the dashboard support member 40 can be easily attached to the fuel tank cover 30.

  The first upper mounting portion 47 and the second upper mounting portion 48 are formed by bending small mounting portions extending upward at both ends in the front-rear direction at the upper edge of the main body 40a so as to be perpendicular to the main body 40a It is done.

  The first upper mounting portion 47 and the second upper mounting portion 48 are directed substantially horizontally (in other words, parallel to the first lower mounting portion 45 and the second lower mounting portion 46). A rectangular hole is formed in the first upper attachment portion 47 so as to vertically penetrate. Although details will be described later, an insertion protrusion 73 (FIG. 16) provided in the dashboard 50 can be inserted into this rectangular hole. As shown in FIG. 15, the second upper attachment portion 48 is formed with a through hole into which a bolt or the like can be inserted.

  Then, the dashboard 50 is attached to the dashboard support member 40 via the first upper attachment portion 47 and the second upper attachment portion 48 so as to cover the rear of the fuel tank cover 30 (details will be described later).

  As shown in FIG. 16, the dashboard 50 is attached with various instruments such as a speedometer and a fuel gauge, and is fitted to the operation panel unit 60 constituting the operation panel 10 of the tractor 100 and the outer periphery of the operation panel unit 60 And an outer peripheral board portion 70 fixed by mating.

  As shown in FIG. 16, the operation panel unit 60 includes a main panel unit 60a and an extending unit 60b extending downward from the central portion of the main panel unit 60a. The main panel portion 60a has a panel surface facing rearward and upward. A pair of concave portions 65 capable of accommodating the protrusions 75 formed on the outer peripheral board portion 70 are formed on the lower end portion of the extending portion 60 b and on the outer side in the left-right direction.

  An outer edge portion 66 which is bent forward (on the side of the fuel tank cover 30 when attached to the fuel tank cover 30) is formed on the outer periphery of the main panel portion 60a.

  The upper locking portion 61 and the lower locking portion 62 are formed two by two at the outer edge portion 66 of the main panel portion 60a. The upper locking portion 61 and the lower locking portion 62 are configured to be engageable with the outer peripheral board portion 70. The two upper locking portions 61 and the two lower locking portions 62 are respectively formed at positions symmetrical with each other in the main panel portion 60a.

  The upper locking portion 61 is configured as a recess formed in a part of the outer edge portion 66 on the upper side of the main panel portion 60a. The lower locking portion 62 is an outer edge portion 66 on the lower side of the main panel portion 60a, and is configured as a rectangular hole formed on the left and right sides of the extending portion 60b.

  Then, in order to fix the operation panel portion 60 to the fuel tank cover 30, two first fixing portions (fixing portions) 63 and two second fixing portions 64 are formed in the operation panel portion 60. There is.

  The first fixing portion 63 is provided on the outer edge portion 66 on the upper side of the main panel portion 60 a at a position outside the two upper locking portions 61 on the left and right sides. The first fixing portion 63 is formed in a substantially horizontal flat shape extended forward from the main panel portion 60 a. The first fixing portion 63 is formed with a penetrating long hole elongated in the front-rear direction for attaching a bolt or the like and opening the front end side.

  The two first fixing portions 63 are provided in the main panel portion 60a so as to correspond to the rear attachment portions 33 of the first attachment portions 31 provided on the left and right sides of the fuel tank cover 30, respectively. Therefore, the first fixing portion 63 and the rear mounting portion 33 of the first mounting portion 31 can be fixed to each other.

  The second fixed portion 64 is formed below the lower locking portion 62 and in the form of a plate extending downward. The second fixing portion 64 is formed elongated in the vertical direction to attach a bolt or the like, and has a penetrating long hole that opens the lower end side.

  In the following description, the second fixing portion 64 provided on the left side of the main panel portion 60a is referred to as a left side fixing portion 64L, and the second fixing portion 64 provided on the right side of the main panel portion 60a is a right side fixing portion It may be called 64R.

  The outer peripheral board portion 70 is configured to cover the outer periphery of the fuel tank cover 30. At the central portion of the outer peripheral board portion 70, an opening 70a is formed in which the operation panel portion 60 can be fitted and attached.

  At the edge of the opening 70a in the outer peripheral board 70, the two upper attachment parts 71 that can be hooked and fixed to the upper locking part 61 of the operation panel 60 and the lower locking part 62 of the operation panel 60 are hooked The two lower mounting portions 72 that can be fixed in place are integrally provided.

  Each of the upper attachment portion 71 and the lower attachment portion 72 is formed as a small member that obliquely extends downward and forward from the edge of the opening 70a. Locking claws 71a and 72a are formed at the tips of the upper mounting portion 71 and the lower mounting portion 72, respectively, for preventing the upper mounting portion 61 and the lower locking portion 62 from being detached.

  With the above configuration, the upper mounting portion 71 is inserted into the upper locking portion 61 of the operation panel portion 60 and hooked with the locking claw 71 a, and the lower mounting portion 72 is also fixed to the lower locking portion 62 of the operation panel portion 60. The outer peripheral board portion 70 can be fixed to the operation panel portion 60 by inserting into and hooking with the locking claw 72a.

  Then, in order to attach the outer peripheral board portion 70 to the fuel tank cover 30, the outer peripheral board portion 70 is formed with an insertion protrusion (fixing portion) 73 and an attachment opening 74.

  As shown in FIG. 16, the insertion protrusions 73 are provided one by one on the inner peripheral surface at the upper portion of the outer peripheral board portion 70 so as to be symmetrical with respect to each other across the top. Each insertion protrusion 73 is formed in the small plate shape extended diagonally toward the front lower direction from the inner peripheral surface of the outer periphery board part 70. As shown in FIG.

  The two insertion protrusions 73 are disposed at positions corresponding to the front attachment portions 32 of the first attachment portions 31 provided on the left and right sides of the upper portion of the fuel tank cover 30.

  The attachment openings 74 are formed as through holes elongated on the left and right sides of the front edge of the outer peripheral board 70 for attaching bolts or the like. Each of the mounting openings 74 is formed to extend obliquely rearward and upward from the front edge of the outer peripheral board portion 70.

  The mounting opening 74 is located at a position corresponding to the third mounting portion 35 of the fuel tank cover 30 when the outer peripheral board 70 is attached to the fuel tank cover 30 with the dashboard support member 40 interposed as in the present embodiment. It is arranged. On the other hand, the second mounting portion 34 is disposed below the third mounting portion 35, and as described above, the distance between the third mounting portion 35 and the second mounting portion 34 is the mounting position of the dashboard 50. Is set to coincide with the amount of change in the vertical direction in accordance with the presence or absence of the dashboard support member 40 described above. Therefore, the mounting opening 74 can be fixed to the third mounting portion 35 when the dashboard 50 is mounted with the dashboard support member 40 interposed, while the dashboard 50 can be mounted without the dashboard support member 40. The mounting opening 74 can be fixed to the second mounting portion 34.

  With the above configuration, the dashboard 50 can be attached to the fuel tank 19 and the fuel tank cover 30 at different positions in the vertical direction depending on the presence or absence of the dashboard support member 40. That is, most of the configuration of the tractor 100 according to the present embodiment can be diverted to easily configure a tractor of another specification in which the dashboard 50 is lowered.

  Next, the structure in the case of attaching the dashboard 50 to a relatively high position is demonstrated with reference to FIG. FIG. 17 is a perspective view showing the dashboard 50 attached to the fuel tank cover 30 via the dashboard support member 40. As shown in FIG. Note that, in FIG. 17, the outer peripheral board portion 70 is drawn in a transparent manner by a chain line in order to easily show the inner configuration of the dashboard 50.

  In the tractor of the specification shown in FIG. 17, the dashboard support member 40 is attached to the fuel tank cover 30 so that the dashboard 50 can be disposed at a relatively high position.

  In order to realize the tractor of this specification, first, as described above, the through hole formed in the first lower attachment portion 45 of the dashboard support member 40 shown in FIG. A pair of dashboard support members 40 is attached to the fuel tank cover 30 by bolting the long holes and bolting the through holes formed in the second lower attachment portion 46 to the long holes of the rear attachment portion 33. .

  Next, the left attachment member (attachment member) 81 and the right attachment member (attachment member) 82 for attaching the operation panel portion 60 of the dashboard 50 to the fourth attachment portion 36 and the fifth attachment portion 37 of the fuel tank cover 30. Attach to each.

  The left side attachment member 81 is formed of an elongated plate member as shown in FIG. 17, and is attached to the fuel tank cover 30 so that its longitudinal direction is up and down. A lower mounting hole (mounting hole) 81a is formed on the lower side of the left mounting member 81, and an upper mounting hole (mounting hole) 81b is formed on the upper side. A bolt can be inserted into the lower mounting hole 81a and the upper mounting hole 81b. The center-to-center distance between the lower attachment hole 81a and the upper attachment hole 81b is 1/2 of the amount by which the attachment position of the dashboard 50 changes in the vertical direction according to the presence or absence of the dashboard support member 40 described above. Is set as.

  The right side attachment member 82 is a starter switch support member 83 supporting a starter switch 124 (see FIGS. 4 and 6), which is a switch for starting the engine 5, and a bending member formed by bending an elongated plate member. And 84 are composed.

  The starter switch support member 83 is formed of a plate-like member, and is disposed in a posture in which the thickness direction is the front and back. The starter switch support member 83 is formed with a penetrating support hole 85 for supporting the starter switch. In order to attach the starter switch support member 83 to the fuel tank cover 30, the lower attachment hole (attachment hole) 83a and the upper attachment hole (attachment hole) 83b are vertically formed in the starter switch support member 83. There is.

  The bending member 84 is formed by bending an elongated plate member into an L shape, and is disposed such that the thickness direction on one side is left and right, and the thickness direction on the other side is disposed back and forth . Then, a portion of the bending member 84 arranged so that the thickness direction is right and left is attached to the left side surface in the vicinity of the upper mounting hole 83b in the starter switch support member 83 by an appropriate method (for example, welding). ing.

  On the other hand, a portion of the bending member 84 disposed so as to be in the front-rear direction in the thickness direction is disposed so as to project forward from the starter switch support member 83. Moreover, the through-hole which can insert a volt | bolt etc. is formed in the said projecting part.

  When the dashboard 50 is attached to the fuel tank cover 30 at the height shown in FIG. 17, the lower attachment hole 81a of the left attachment member 81 is bolted to the fourth attachment portion 36 of the fuel tank cover 30. It is fixed. In addition, the lower mounting hole 83a of the right mounting member 82 is fixed by bolting to the central insertion hole among the three insertion holes aligned vertically in the fifth mounting portion 37 as shown in FIG. Thus, the left mounting member 81 and the right mounting member 82 are mounted to the fuel tank cover 30.

  Thereafter, the operation panel unit 60 is attached. Specifically, as shown in FIG. 17, the second upper attachment portion of the dashboard support member 40 in which the long holes of the first fixing portion 63 disposed on the left and right of the operation panel portion 60 are disposed in a pair. Each is bolted to 48 through holes. Further, an elongated hole formed in the left fixing portion 64L of the operation panel portion 60 is bolted to the upper mounting hole 81b of the left mounting member 81, and an elongated hole formed in the right fixing portion 64R of the operation panel portion 60 is It is bolted to the through hole formed in the bending member 84 of the right side attachment member 82.

  Next, the outer peripheral board portion 70 is attached. Specifically, the insertion protrusion 73 of the outer peripheral board portion 70 is inserted into the rectangular hole formed in the first upper attachment portion 47 of the dashboard support member 40. Further, the upper mounting portion 71 and the lower mounting portion 72 are respectively inserted into the upper locking portion 61 and the lower locking portion 62 of the operation panel portion 60, and are fixed by being hooked.

  Then, the mounting opening 74 formed in the outer peripheral board portion 70 is bolted to the third mounting portion 35 of the fuel tank cover 30. When the dashboard 50 is mounted at the height shown in FIG. 17, the mounting opening 74 is configured so that the position of the mounting opening 74 coincides with the third mounting portion 35 of the fuel tank cover 30. 3 can be bolted to the mounting portion 35 without any problem.

  In the tractor of the specification of FIG. 17 (tractor 100 of the present embodiment) in which dashboard 50 is mounted at a relatively high position, cover members 86 covering the lower part not covered by dashboard 50 are provided on the left and right. Each cover member 86 is provided to be connected to the lower end of the dashboard 50 and the lower end of the fuel tank cover 30.

  In order to fix the cover member 86, a cover mounting portion 76 is provided at the lower end portion of the outer peripheral board portion 70 as shown in FIG. 16, and the left and right lower ends of the frame portion 30b of the fuel tank cover 30 are shown in FIG. A cover attachment 38 is provided as shown in FIG. The cover members 86 are fixed to the cover mounting portions 76 and 38, for example, by screws. With this configuration, the portion exposed below the dashboard 50 and the fuel tank cover 30 can be suitably covered.

  Subsequently, a structure in the case where the dashboard 50 is mounted at a relatively low position will be described with reference to FIG. FIG. 18 is a perspective view showing another type of tractor in which the dashboard 50 is directly attached to the fuel tank cover 30. FIG. Note that, in FIG. 18 as well as FIG. 17, the outer peripheral board portion 70 is drawn in phantom in a dashed line in order to clearly show the inner configuration of the dashboard 50.

  In the tractor of the specification shown in FIG. 18, by directly attaching the dashboard 50 to the fuel tank cover 30, the dashboard 50 is disposed at a relatively lower position as compared with the case where the dashboard support member 40 is interposed. become.

  In order to realize the tractor of this specification, first, the left attachment member 81 and the right attachment member 82 are attached to the fourth attachment portion 36 and the fifth attachment portion 37 of the fuel tank cover 30, respectively. However, the positions at which the left mounting member 81 and the right mounting member 82 are attached to the fuel tank cover 30 are different from those in FIG. That is, the upper mounting hole 81 b (not the lower mounting hole 81 a) of the left mounting member 81 is fixed to the fourth mounting portion 36 of the fuel tank cover 30 by bolting. Further, among the three insertion holes in which the two upper mounting holes 83b (not the lower mounting holes 83a) of the right mounting member 82 are vertically aligned in the fifth mounting portion 37 as shown in FIG. It is fixed to the hole by bolting.

  Thus, the left mounting member 81 and the right mounting member 82 are mounted to the fuel tank cover 30. The left attachment member 81 is attached to the fourth attachment portion 36 so as to extend in the opposite direction to that in FIG. 17, so the distance between the lower attachment hole 81a and the upper attachment hole 81b is set small. Even in the compacted configuration, the dashboard 50 can be attached to the fuel tank cover 30 in both cases of FIGS.

  Thereafter, as shown in FIG. 18, the long holes of the first fixing portion 63 disposed on the left and right of the operation panel portion 60 are bolted to the long holes of the rear attachment portion 33 of the first mounting portion 31 in the fuel tank cover 30. It is stopped. Further, the long hole formed in the left side fixing portion 64L of the operation panel portion 60 is bolted to the lower side mounting hole 81a of the left side mounting member 81, and the long hole formed in the right side fixing portion 64R of the operation panel portion 60 , And is bolted to a through hole formed in the bending member 84 of the right side attachment member 82.

  Next, the outer peripheral board portion 70 of the dashboard 50 is attached. Specifically, as shown in FIG. 18, the insertion protrusion 73 of the outer peripheral board portion 70 is inserted into the insertion space 32 a of the front attachment portion 32 of the first attachment portion 31. Further, the upper mounting portion 71 and the lower mounting portion 72 are respectively inserted into the upper locking portion 61 and the lower locking portion 62 of the operation panel portion 60, and are fixed by being hooked.

  Then, the mounting opening 74 formed in the outer peripheral board portion 70 is bolted to the second mounting portion 34 of the fuel tank cover 30. When mounting the dashboard 50 at the height shown in FIG. 18, the mounting opening 74 is configured so that the position of the mounting opening 74 coincides with the second mounting portion 34 of the fuel tank cover 30. 2 can be fixed to the mounting portion 34 with no problem. Further, in the specification of FIG. 18, the cover member 86 attached in FIG. 17 is omitted.

  Thus, without changing the structure of the dashboard 50 and the fuel tank cover 30, it is possible to realize the structure of attaching the dashboard to two positions in the vertical direction only by the presence or absence of the arrangement of the dashboard support member 40. Therefore, the existing dashboard 50 and the fuel tank cover 30 can be diverted to the tractor of another specification shown in FIG. 18, and the time and cost required for parts management can be significantly reduced.

  As described above, the tractor 100 according to the present embodiment includes the steering column 11, the bracket 20, and the four anti-vibration rubbers 42. The bracket 20 supports the steering column 11 and includes a tilt mechanism. The anti-vibration rubber 42 supports the bracket 20. The four anti-vibration rubbers 42 include a set of anti-vibration rubbers 42 in which the distance L1 in the vertical direction is larger than the diameter D1 of the bottom surface of the steering column 11.

  As a result, the movement of the bracket 20 accompanying the deformation of the vibration-proof rubber 42 can be made smaller compared to the case where the plurality of vibration-proof rubbers 42 are arranged at a distance smaller than the diameter D1 of the steering column 11. The anti-vibration property of the column 11 is enhanced. As a result, the steering operation can be performed comfortably.

  Further, in the tractor 100 of the present embodiment, one of the pair of vibration-proof rubbers 42 is disposed at a position higher than the rotation shaft 27 of the tilt mechanism, and the other is disposed at a position lower than the rotation shaft 27.

  As a result, the combination of the anti-vibration rubber 42 can well suppress generation of vibration in the bracket 20 in the same direction as the tilt direction (vibration indicated by the arrow in FIG. 9) by the tilt mechanism.

  Further, in the tractor 100 of the present embodiment, the four vibration isolation rubbers 42 have vibration isolation rubbers 42 whose distance in the left-right direction (L2 or L3 shown in FIG. 11) is larger than the diameter D1 of the bottom surface of the steering column 11. Contains a set of

  This makes it possible to achieve good vibration isolation of the bracket against vibrations in various directions.

  Further, in the tractor 100 according to the present embodiment, as shown in FIG. 9, the four vibration damping rubbers 42 include a set of vibration damping rubbers 42 whose positions in the front-rear direction are different.

  This makes it possible to achieve good vibration isolation of the bracket against vibrations in various directions.

  Further, in the tractor 100 according to the present embodiment, the four vibration damping rubbers 42 include a set of vibration damping rubbers 42 arranged in different directions.

  Thereby, the vibration of a complicated direction can be favorably reduced by the combination of the vibration-proof rubber 42.

  Moreover, in the tractor 100 of the present embodiment, the anti-vibration rubber 42 is provided with a bolt shaft. The four anti-vibration rubbers 42 provide anti-vibration support for the front part of the bracket 20, two anti-vibration rubbers 42 arranged with their bolt axes directed in the front-rear direction, and anti-vibration support for the lower part of the bracket 20 And two anti-vibration rubbers 42 disposed with their axes directed vertically.

  As a result, the bracket 20 can be stably vibrated with a small number of vibration-proof rubbers 42.

  Further, in the tractor of the present embodiment, the bracket 20 includes the base member 21 and the movable member 22. The movable member 22 is rotatably supported by the base member 21. The steering column 11 is attached to the movable member 22. A tension spring 28 is disposed between the base member 21 and the movable member 22. The tension spring 28 exerts an elastic force on the movable member 22 so as to resist the falling of the movable member 22 by gravity.

  Thus, when the steering column 11 is tilted in the direction opposite to the direction in which gravity acts (that is, in the direction in which the steering column 11 is raised), the direction of the steering column 11 can be changed with a small force. In addition, since the tension spring 28 absorbs the vibration generated in the bracket 20, the vibration isolation can be further enhanced.

  The preferred embodiment of the present invention has been described above, but the above-described configuration can be modified, for example, as follows.

  In the above embodiment, the anti-vibration rubber 42 is disposed apart from the diameter D1 of the bottom surface of the steering column 11 in the vertical and horizontal directions, and in the front-rear direction is substantially equivalent to the diameter D1 of the bottom surface of the steering column 11. Only placed apart. However, the arrangement of the anti-vibration rubbers 42 may be changed so that the distance between the anti-vibration rubbers 42 is larger than the diameter D1 of the bottom of the steering column 11 in the front-back direction as well as in the vertical and horizontal directions. .

  The number of anti-vibration rubbers 42 is not limited to four as in the above embodiment, and can be changed as appropriate.

  In the above embodiment, the direction of the anti-vibration rubber 42 (the direction of the bolt axis) is directed in the front-rear direction or in the up-down direction. However, for example, the structure may be changed such that the anti-vibration rubber 42 whose bolt axis is directed in the left-right direction is attached to the shaft support portion 21 b of the base member 21.

  The shape of the base member 21, the mounting position of the vibration-proof rubber 42, the mounting position of the tension spring 28, and the like can be changed as appropriate. Further, the arrangement of the lock mechanism 49 and the stopper member 29 with respect to the base member 21 may be changed to a configuration in which the left and right are reversed.

11 steering column 20 bracket 21 base member 22 movable member 27 rotation axis (tilt axis of tilt mechanism)
28 Tension spring (elastic member)
42 Anti-vibration rubber

Claims (2)

With the steering column,
A bracket for supporting the steering column and having a tilt mechanism;
An elastic member,
A support member to which the bracket is fixed;
Equipped with
The bracket includes a base member and a movable member.
The movable member is rotatably mounted on an upper portion of the base member about a rotation axis.
The lower end portion of the steering column is fixed to the upper portion of the movable member,
The elastic member is disposed between the base member and the movable member, and exerts an elastic force on the movable member to resist falling of the movable member by gravity.
The support member integrally includes a front surface portion, a pair of left and right side surface portions, and a pair of left and right bent portions, and upper side vibration isolation between the front surface portion and the front attachment portion of the base member A tractor , comprising: rubber; and a lower anti-vibration rubber between the bent portion and the lower attachment portion of the base member . The tractor according to claim 1, wherein
The tractor according to claim 1, wherein a distance between the upper vibration-proof rubber and the lower vibration-proof rubber is set larger than a diameter of a bottom surface of the steering column .

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