JP2011152889A - Tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components, by firmly connecting and holding a tank frame for installing and holding a fuel tank and an installation frame of a column for supporting a steering handle by a reinforcing member, and arranging an installation part capable of installing a throttle cable in the reinforcing member. <P>SOLUTION: This invention is constituted by being reinforced by the reinforcing member 17 by connecting the tank frame 13 for installing and supporting the fuel tank 12 and the installation frame 16 of a handle column 14 for supporting the steering handle 6, and is constituted as the tractor characterized by forming an installation part 18 of the throttle cable 20 in the reinforcing member 17, and is also constituted as the tractor characterized by integrally constituting a shaft installing tube 22 for internally installing a lever shaft of an advance-retreat lever 21 in the column installing frame 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tractor used for farm work.

  2. Description of the Related Art Conventionally, there is a configuration in which a tank frame for mounting a fuel tank is connected to an upper surface side of a handle frame provided with a handle post and an upper end side of a rear shielding plate (see, for example, Patent Document 1).

JP 2008-74128 A

  An object of the present invention is to firmly connect and hold a tank frame for mounting and holding a fuel tank and a column mounting frame for supporting a steering handle by a reinforcing member, and a mounting portion on which a throttle cable can be attached to the reinforcing member. By providing it, the number of parts will be reduced.

In order to solve the above problems, the present invention has taken the following technical means.
That is, according to the present invention, the tank frame (13) for mounting and supporting the fuel tank (12) and the mounting frame (16) of the handle column (14) for supporting the steering handle (6) are connected. The reinforcing member (17) is configured to reinforce, and the reinforcing member (17) is provided with a mounting portion (18) of a throttle cable (20).

Since the tank frame (13) and the column mounting frame (16) are connected and held by the reinforcing member (17), both are firmly held and a stable strength is ensured.
Further, since the reinforcing member (17) is formed with the (20) attachment portion (18) of the throttle cable, it is not necessary to separately provide attachment parts, and the number of parts is reduced.

  The present invention according to claim 2 is characterized in that the column mounting frame (16) is integrally formed with a shaft-equipped tube (22) that houses the lever shaft of the forward / reverse lever (21). 1 tractor.

  Since the column mounting frame (16) and the shaft mounting tube (22) are integrated, the number of parts can be reduced and the cost can be reduced. The shaft mounting tube becomes the strength member of the column mounting frame, and the rigidity of the column mounting frame is secured. The

  In summary, according to the present invention of claim 1, since the tank frame and the column mounting frame are connected by the reinforcing member, both the frames themselves are firmly held, and a stable strength can be ensured. . In addition, since the throttle cable mounting portion is formed on the reinforcing member, the number of parts can be reduced, and the cost can be reduced.

  According to the second aspect of the present invention, although the column mounting frame and the shaft tube are integrated with each other, the number of parts can be reduced and the cost can be reduced. Since the tube serves as a strength member of the column mounting frame, the rigidity of the column mounting frame is further ensured.

Side view of tractor The perspective view of the principal part which shows the support structure of a fuel tank and a steering handle The perspective view of the principal part same as the above when equipped with a fuel tank and other devices A perspective view of the main part as seen from the other direction Top view of the main part Side sectional view of the main part showing the steering handle support structure Side view of cam body Side view of column tube Radial view of radiator Perspective view of main part showing floor support structure of tractor Top view of the main part The perspective view which shows the support structure of an operation lever Top view of the main part Side view of the main part showing the support structure of the safety frame Perspective view of essential parts of safety frame support structure Plan view of the main part showing the mounting structure of the HST neutral valve Side view of the main part Rear view of the main part Top view of pressure detection metal Side view Hydraulic circuit diagram Side view of another tractor

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a tractor. An engine E is mounted inside a bonnet 2 at the front of the traveling vehicle body 1, and the rotational power of the engine E is transmitted to a transmission in the transmission case 3 and is decelerated by the transmission. The generated rotational power is transmitted to the front wheel 4 and the rear wheel 5. A steering handle 6 for steering the front wheels 4 and 4 is provided behind the engine E. Further, a driver's seat 7 is installed behind the steering wheel 6. A rear-view arch-type safety frame 8 that protrudes is erected.

  The front panel 9 is erected at the front end of the floor step 10 at a position on the back side of the engine E. A meter panel 11 is disposed on the front panel 9 at a position in front of the steering handle 6.

  A fuel tank 12 is provided between the front panel 9 and the engine E, and is attached to and supported by the tank frame 13. The tank frame 13 includes an arch-type support frame 13a and a U-shaped holding frame 13b, and the arch-type support frame 13a projects from the column mounting frame 16 side of the handle column 14 that supports the steering handle 6. It has become. The column mounting frame 16 has a column mounting portion 16a protruding and a mounting portion 16d for the fuel tank 12 provided in the vicinity of a cross between the vertical wall 16b and the horizontal wall 16c.

  The U-shaped holding frame 13 b of the tank frame 13 and the column mounting portion 16 a are firmly connected and held by the reinforcing member 17. The reinforcing member 17 is provided with an attachment recess 18 for attaching a throttle cable 20 that is linked to the accelerator lever 19 and the engine throttle.

  The forward / reverse lever 21 that controls the forward / backward movement of the machine body is configured to be swingable in the forward / backward direction with the shaft-equipped tube 22 that houses the lever shaft as a rotation center. The shaft mounting tube 22 is integrated with the column mounting frame 16 by welding means or the like. Thereby, the shaft mounting tube 22 becomes a strength member of the column mounting frame 16, and the rigidity of the column mounting frame is ensured.

  As shown in FIG. 6, in the structure in which the cam body 26 for moving the handle angle sensor is inserted into the column tube 15, the cam body 26 includes a screw machined into the handle shaft 25 and a slit (guide for the column tube 15). The groove) 27 slides up and down by the rotation of the handle shaft 25. The cam body has a thickness t (see FIG. 7A) that is approximately 40% of the diameter of the cam body. Conventionally, since the thickness of the cam body is 100 percent (same as the diameter) (see FIG. 7B), the slit of the column tube is opened at the upper end in order to insert the cam into the column tube (FIG. 8). (See (B)).

  For this reason, after assembling each part, it is necessary to close the open portion, and parts for that purpose are necessary. In this example, by setting the cam body thickness to 40% of the cam body diameter, the cam can be rotated in the column tube, and the column tube slit is opened as shown in FIG. There is an advantage that assembly is possible even without them, and parts for closing the opening are not required.

  A radiator 28 is provided on the front side of the engine E and is mounted and supported on a bracket 29. As shown in FIG. 9, the upper frame 29a of the radiator bracket 29 and the striker pin 30 of the bonnet hook are integrated, and the vertical frames 29b and 29c of the radiator bracket and the striker are disposed on the front surface of the upper frame 29a. A V-shaped folded portion 29v that is folded obliquely so as to connect the pins 30 is provided. With such a configuration, the strength of the striker is further ensured.

  Conventionally, an angular velocity sensor used for horizontal control or the like of a work machine is installed on the back side of a seat panel on which a driver's seat is placed, and a sensor mounting bracket is directly welded to the seat panel. In this example, as shown in FIGS. 10 and 11, the left and right fender frames 32, 32 connecting the left and right fender frames 32, 32 between the left and right fender frames 32, 32 constituting the floor step 10 of the tractor. The connecting frame 33 is configured and provided so that a space in which the angular velocity sensor 31 can be attached is secured to the left and right connecting frames 33. This makes it possible to reduce the number of parts and facilitate assembly.

  As shown in FIG. 12, in the mounting structure of the operation lever (finger gap lever) 35 for tightening and mounting the outer periphery of the cylindrical 34-shaped mounting portion, about half of the annular fastener 36 is formed of a rigid body 36a, and the remaining about One half is made of a belt-like metal 36b that can be elastically deformed. One of the belt-like metals 36b has a key shape 36c and is hooked into the hole 36d of the rigid body 36a. The other of the belt-like metal 36b is a tap 36e, and is tightened with a screw 36f from a hole of the rigid body 36a. A part of the metal 36b is provided with a bulging relief portion 36g that once leaves the cylindrical shape and returns to the cylindrical shape again.

  Conventionally, as a countermeasure for absorbing the variation in the cylindrical outer diameter tolerance, the torque for tightening the screw is controlled in a constant manner, and the mounting is completed while the gap between the rigid body and the metal is open. In this configuration, there is a high possibility that the rigid body portion is damaged when the torque is not managed (tightening is performed so that there is no gap).

  In this example, when the screw is tightened, a slight gap is left at the position where torque starts to be applied, and the screw is further tightened. 36 g (see FIG. 13A) expands (see FIG. 13B), and the shape changes. As a result, it is possible to absorb the variation in outer diameter tolerance without managing severe tightening torque, and it is possible to fix the lever reliably.

  As shown in FIG. 14, the safety frame 8 is configured to be attached to a lops bracket 37 to which a mount rubber 38 installed on the rear axle of the tractor is attached. The shape of the joint portion of the safety frame 8 to the mount rubber 38 is a U-shaped plate 39 opened forward, and the mount rubber is sandwiched between the U-shaped plates at the top and bottom.

  In the past, a safety frame was mounted on the mount rubber, and was sandwiched with washers from below the mount rubber. Since the mounting rubber is used to mount the safety frame, the amount of movement of the safety frame when the tractor falls is large and it is difficult to suppress this. In the case of this example, the amount of movement of the safety frame when the tractor falls can be suppressed without sacrificing the vibration isolation effect by sandwiching the mount rubber from above and below with the U-shaped plate.

  In the embodiment shown in FIG. 15, the lops brackets 37 to which the mounting rubber 38 is attached are provided on the left and right rear axles, and the safety frame is attached on the mounting rubber 38, and the safety frame stopper 40 is provided in front of the bracket 37. It is provided so as to suppress the falling of the safety frame. Further, the stopper 40 can effectively suppress both forward and lateral falls by welding to the front outer side of the mount rubber at an angle of 45 °.

  FIGS. 16 to 18 show the mounting structure of the HST neutral valve. In this embodiment, in the embodiment in which the HST (hydraulic continuously variable transmission) is built in the transmission case 3, the HST pressure take-out detection is performed. A pressure detection metal 42 that can be taken out from the oil passage of the pressure port 41 to the outside of the case 3 is attached, and a neutral (solenoid) valve 43 is attached to the metal 42, and the pressure detection port 41, which is configured in the metal, 41 is configured to communicate with the extraction portion 42a and the oil passage 42b.

  In this case, the neutral valve 43 is attached at a position outside the mission case 3. According to this, by using the pressure detection metal, the mounting structure of the valve becomes simple and can be implemented at a low cost, and the neutral valve is located outside the transmission case, so that the valve maintenance becomes easy.

  In the above configuration, the neutral valve 43 can be selectively attached to either the upper side (upper pressure detection port 41 side) or the lower side (lower pressure detection port 41 side) of the pressure detection metal 42. Yes. Even if the layout or configuration of the neutral valve such as the exterior is changed, it is possible to select and install one that is easy to install, and to share components.

  When driving a tractor at night, the operation part is dark and difficult to see, making it difficult to operate. If the driving operation part becomes even brighter, the operation at the start of driving can be performed easily and quickly.

  Therefore, in this example, as shown in FIG. 22, an optical detection sensor 50 is provided at an appropriate position above the tractor body, and the driver approaches the driver's part near the driver's seat 7 or the steering handle 6 of the driver's part. A driver detection sensor 51 for sensing is provided. When the surroundings become dark, it is detected by the light detection sensor 50, and the light 52 of the meter panel 11 is turned on. When the driver approaches the driving unit, the detection sensor 51 detects the presence of the driver, and the light 52 on the meter panel 11 is automatically turned on. The light turns off automatically when the driver is gone.

  Although the light detection sensor 50 is provided on the front panel 9 in the illustrated example, it may be provided on the hood 2 or the fender 53. The driver detection sensor 51 may be a sensor that detects the body temperature of the driver or a sensor that detects pressure due to the grip force of the driver, and may be provided on the circumferential portion of the steering handle 6. As another example, a sensor that senses the weight of the driver may be provided below the driver's seat, and the light may be automatically turned on based on the sensing result when the driver is seated. Good. Further, the light 52 is not limited to the existing one in the meter panel, and may be installed separately within the range of the driving operation unit.

6 Steering handle 12 Fuel tank 13 Tank frame 14 Handle column 16 Column mounting frame 17 Reinforcing member 19 Accelerator lever 20 Throttle cable 21 Forward / reverse lever 22 Shafted tube

Claims (2)

  The tank frame (13) for mounting and supporting the fuel tank (12) and the mounting frame (16) of the handle column (14) for supporting the steering handle (6) are connected to reinforce the reinforcing member (17), A tractor characterized in that a mounting portion (18) of a throttle cable (20) is formed on the reinforcing member (17).   The tractor according to claim 1, wherein the column mounting frame (16) is integrally formed with a shaft-equipped tube (22) that houses a lever shaft of the forward / reverse lever (21).

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