JP2003320963A - Bonnet opening/closing mechanism for tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in a tractor having a bonnet with a rotation fulcrum in back and opened/closed by rotation that although a user maintains in many cases without calling a serviceman for inspection of a battery liquid, charging, supply of cooling water or the like, the bonnet may lay a heavy burden on a checking person since the bonnet is heavier and bigger as a tractor is larger, in particular, opening/closing the bonnet requires much efforts to aged person. <P>SOLUTION: A bonnet 6 covering an engine 5 is constituted rotatable for opening and closing, and an elastic body 40 energizing in a direction to open the bonnet 6 is disposed between the bonnet and a tractor. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reducing an operation force for opening and closing a hood of a tractor.

[0002]

2. Description of the Related Art Conventionally, a bonnet is provided at the front of a tractor body to house an engine, a battery, a cooling fan, a radiator, etc. inside so as to prevent them from being exposed and noise leaks to the outside. The noise is reduced by avoiding it. This bonnet is configured so that it can be opened and closed by arranging a rear upper rotation fulcrum shaft, and by opening the bonnet upward and rearward, it is possible to easily inspect and repair the equipment stored inside. ing.

[0003]

Often, the user himself / herself performs maintenance such as checking and charging of the battery fluid and replenishing cooling water without calling a service person. However, the larger the tractor is, the larger and heavier the bonnet is. However, it may be a heavy burden on the inspection worker. In particular,
For the elderly, opening and closing the bonnet required a lot of work.

[0004]

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

That is, according to the first aspect of the present invention, the bonnet covering the engine is configured to be openable / closable and the elastic body for urging the bonnet in the direction of opening the bonnet is disposed between the bonnet and the main body side.

According to a second aspect of the present invention, the elastic body is a torsion spring, and the torsion spring is arranged on a pivotal fulcrum shaft of the bonnet and urged in the direction of opening the bonnet.

According to a third aspect of the present invention, the torsion spring is a double torsion spring, and both ends of the torsion spring are fixed to either the bonnet or the machine side, and a central fixing portion of the torsion spring is fixed to the other. is there.

According to a fourth aspect of the present invention, a position adjusting mechanism is provided at the central fixed portion of the double torsion spring.

According to a fifth aspect of the present invention, the elastic member is a damper and is arranged between the inside of the bonnet and a supporting member provided on the engine.

According to a sixth aspect of the present invention, the elastic member is a spring, and the spring is externally fitted and arranged on a stand rod arranged between the inside of the bonnet and a supporting member provided on the engine.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. FIG. 1 is a side view showing the overall construction of a tractor according to an embodiment of the present invention, FIG. 2 is a side view showing the internal structure of a bonnet, and FIG. 3 is a side view showing the vicinity of a rotation fulcrum shaft of the bonnet. FIG. 4 is a front view showing the vicinity of the pivot of the bonnet, FIG. 5 is a view showing an operation panel, FIG. 6 is a view showing an irradiation range of a spot lamp, FIG. 7 is a side view of a cab of a cabin specification, and FIG. FIG. 9 is a side view showing the vicinity of the rotation fulcrum shaft of the hood of the second embodiment, FIG. 9 is a side view showing the vicinity of the rotation fulcrum shaft of the bonnet of the third embodiment, and FIG. 10 is a position adjusting mechanism of the torsion spring fixing portion. It is a partial cross-sectional side view.

In FIGS. 1 and 2, this work vehicle uses a tractor as an example. Front and rear wheels 1 and 2 are supported at the front and rear of the machine, and an engine 5 is arranged inside a hood 6 on an engine frame 8. A dashboard 12 is arranged behind the bonnet 6, an operation panel 7 and a steering handle 10 are provided on the dashboard 12, and a seat 11 is arranged behind the steering handle 10. . At the rear of the seat 11, a safety frame 30 is erected so as to be tiltable. The safety frame 30 is formed in an inverted U-shape when viewed from the rear so that the seat 11
Installed in the rear.

A clutch housing is arranged in the rear part of the engine 5, a mission case 9 is arranged in the rear part of the clutch housing, the power from the engine 5 is transmitted to the rear wheels 2 for driving, and the mission case 9 is further installed. Two wheels
The driving force can be simultaneously transmitted to the front wheels 1 via the four-wheel drive switching mechanism.

Further, the driving force of the engine 5 is transmitted to the PTO shaft 15 protruding from the rear end of the transmission case 9, and is transmitted from the PTO shaft 15 via a universal joint (not shown) to the rear end of the machine body through a work machine mounting device. It is configured to drive a work machine (not shown) that has been installed. A clutch pedal 16 and a brake pedal for connecting and disconnecting the main clutch are arranged on the lower front side of the seat 11.

Further, as shown in FIG. 6, a diff lock pedal 35 is arranged on the step of the front lower part of the seat 11, and a handle 37 of a stop valve is arranged on the diff lock pedal 35. Further, a main gear shift lever, a sub gear shift lever, a position lever 31, a plowing depth setting lever 32, and the like are arranged on a side portion of the seat 11. With such a configuration, when working at night, there was no lighting device to illuminate the driving section in the past, so I was searching for pedals, levers, etc. by hand, so it took time to search and I made mistakes in operation. .

Therefore, in the tractor of this embodiment,
Foot light 34 that illuminates the driver's feet (steps)
However, the diff lock pedal 35 and the like are arranged below the dashboard 12 and illuminate obliquely downward. Further, at the base end portions on both sides of the safety frame 30 behind the driver's seat, main shift levers, sub shift levers, and position levers 3 arranged on both sides of the seat 11 are provided.
The control lever lights 33, 33 for irradiating the control lever 1, the working depth setting lever 32, and the like are provided. When the operation lever light 33 is attached to a tractor having a cabin 42 as shown in FIG. 7, the operation lever light 33 is attached to rear pillars 43 standing upright on the left and right in the rear portion of the cabin. The lights 33 and 34 are connected to a switch for operating the lighting of the headlamp, and are configured to light in synchronization with the lighting of the headlamp.

It should be noted that, in a cabin-type tractor, it has been customary that the interior lighting is turned on in conjunction with the opening / closing operation of the door.
It's hard to see around your feet and around the control lever only with the room lights that illuminate from above. Also, since the interior light does not light up unless the door is opened, the cabin is otherwise dark and it is difficult to work. However, on the contrary, if the light is kept on, it is dazzling and the visibility to the outside is reduced, which causes trouble in traveling. Therefore, such a spotlight suppresses the brightness and illuminates only a necessary portion to facilitate nighttime work. With such a configuration, during nighttime work, the steering handle 10, the clutch pedal 16, etc., such as the steering wheel 10, can be easily operated, but other than these, the diff lock pedal 35, the position lever 31, etc. Even if the user is away from the position of the hand or foot during the traveling operation, the position can be easily known by the irradiation of the light, and the operability can be improved.

An operation panel 7 is provided on the dashboard 12 in front of the seat 11 of the driver's seat. On the operation panel 7, as shown in FIG. An indicator lamp panel 59 is arranged around the tachometer panel 58 with 44 on the left side, the fuel consumption mode / working machine raising mode switching mode panel 48 on the right side, the tachometer panel 58 in the center. A four wheel drive changeover switch 45, a speed increase changeover switch 46, and a turning brake switch 47 are arranged on the traveling mode changeover panel 44, and each switch is a four wheel drive lamp 53, a double speed lamp 54 arranged on a display lamp panel 59, Each of them is connected to an auto brake lamp 55, and when the switch is turned on, the corresponding lamp is interlocked and lit.

Further, an energy saving mode switch 50, a back rising switch 51, and a swinging up switch 52 are provided on the fuel consumption mode / working machine rising mode switching mode panel 48, and these switches are an energy saving mode lamp 60 on a display lamp panel 59. , The back rise lamp 57, and the swing rise lamp 56, respectively, and turn on either switch.
When N is set, the lamp is lit correspondingly. Further, each switch and the lamp are colored in different colors, and the color of the name plate on the panel on which each switch is provided and the color of the lamp corresponding to each switch are the same. For example, if the panel color of the four-wheel drive changeover switch 45 is red, the four-wheel drive lamp 53 is also lit in red. With this configuration, when the operator operates the switch, the lamp of the same color is turned on, so that the switch operation can be confirmed at a glance.

Next, an outline of the arrangement structure inside the bonnet 6 in which the engine 5 is mounted will be described with reference to FIG. The engine 5 is mounted on the engine frame 8 and
The fan shaft is projected further forward, the cooling fan 18 is fixed on the fan shaft, and the cooling fan 18 is rotationally driven by the driving of the engine 5, and the radiator 20 and the air conditioner arranged in front of the cooling fan 18 are driven. The condenser is cooling. A battery 19 and an air cleaner are arranged in front of the radiator 20.

The bonnet 6 has a structure in which a rotary fulcrum shaft 27 is provided at the rear upper portion, and an elastic member is arranged between the bonnet 6 and the machine side so that the bonnet 6 can be biased upward and opened. Therefore, the present invention is intended to reduce the operation force of the upward rotation by this elastic member. First, a first embodiment of the bonnet opening operation reducing mechanism will be described with reference to FIGS. 3 and 4. The lower portion of the bonnet support frame 22 is fixed to the rear surface of the engine 5 (or the engine frame 8 or the clutch housing), and the shaft support stay 41 is fixed to the upper portion of the bonnet support frame 22. The rotation fulcrum shaft 27 is pivotally supported (or fixed). The support stay 41 has a recessed notch portion 41b formed in the center of the upper left and right when viewed from the front, and cylindrical portions 41a and 41a for pivotally supporting the rotation fulcrum shaft 27 are formed on both sides of the notch portion 41b. ing. The rotation fulcrum shaft 27
Mounting stays 29 are fixed to both ends of the mounting stay 2
The lower surface of the rear end of the bonnet 6 is fixed to the hood 9. A bracket 70 extends downward and is fixedly mounted on the mounting stay 29, a rear end of a stand rod 71 is pivotally supported on a lower front portion of the bracket 70, and the other side of the stand rod 71 is erected on the engine 5. The rod supporting stay 26 is inserted into a long hole 26a opened at the upper portion. The front portion of the stand rod 71 is bent in a crank shape to form a locking portion 71a, and when the bonnet 6 is rotated upward, the locking portion 71a locks in the elongated hole 26a to lock the bonnet 6 in place. I am trying to keep it open.

A torsion spring (torsion spring) 40 as an elastic member is externally fitted on the bonnet rotation fulcrum shaft 27 located at the cutout portion 41b, one end is on the bonnet 6 side, and the other end is on the support stay 41. The bonnet 6 is arranged so as to abut against the bonnet 6 and urge the bonnet 6 in the opening direction to reduce the opening operation force of the bonnet 6. In the present embodiment, the torsion spring 40 is a double torsion spring, and spring parts 40b and 40b wound in opposite directions are formed on the left and right sides, and the projecting parts 40c and 40c at both ends are fixed to the bonnet 6. The left and right center between the spring portions 40b and 40b is formed in a U shape so as to connect them to form a fixing portion 40a, and the fixing portion 40a is fixed to the supporting stay 41 on the machine side. However, the projecting portions 40c and 40c may be fixed to the supporting stay 41 on the machine side, and the fixing portion 40a may be fixed to the bonnet 6 side.

A position adjusting mechanism is provided on the fixing portion 40a. In this embodiment, the fixing portion 40a is locked by a bolt 36, and the bolt 36 is supported by a support stay 41.
The nut 14 is welded and fixed to the nut 14, and the bolt 36 is rotated to adjust the distance between the fixed portion 40a and the support stay 41. The bolt 3
No. 6 makes it possible to adjust the torque of the torsion spring 40 by adjusting this position. In this embodiment, by loosening, the angle between the protruding portion 40c and the fixed portion 40a becomes smaller and the spring force becomes stronger. As shown in FIG. 10, the fixing portion 40a includes a head portion 36a of the bolt and a groove portion 36 formed in the screw portion of the bolt.
It is placed between the washer 13 and the bolt 36.
The fixing portion 40a is configured to move together with the bolt when the is rotated. With this configuration, the torsion spring 40 constantly urges the bonnet 6 upward. Therefore, when the bonnet 6 is opened, the urging force of the torsion spring 40 is applied.
It can be used as an assisting force when opening, and can be opened without requiring a large amount of force.

Next, a second embodiment of the bonnet opening operation reducing mechanism will be described with reference to FIG. The bonnet opening operation reducing mechanism of the second embodiment is the torsion spring 40.
Instead of using, the spring 24 is fitted as an elastic member between the bracket 70 (bonnet side) on the stand rod 71 and the rod support stay 26 (main unit side). The spring 24 acts as a compression spring via a bracket 70 to urge the bonnet 6 in the opening direction. In this way, when the bonnet 6 is opened, a small force is applied by the urging force of the spring 24.
The stand rod 71 can be opened and closed
Although the locking portion 71a is released and the bonnet 6 is rotated downward by its own weight, it is not closed vigorously by the urging force of the spring 24, and it can be closed while softening the shock.

Next, a third embodiment of the bonnet opening operation reducing mechanism will be described with reference to FIG. The bonnet opening operation reducing mechanism of the third embodiment eliminates the torsion spring 40 of the first embodiment and uses a gas spring or a hydraulic damper instead of the stand rod 71.
One end of the damper 25 is pivotally supported by a bracket 70 fixed to the lower front portion of the bonnet 6, and the other end is pivotally supported by the support stay 26.

With this structure, when the front end of the bonnet 6 is held and pulled up by hand, the damper 25 is urged upward to reduce the upward rotation operation force, and the lifted position is increased. Can be held at. Then, when closed, the damper 25 suppresses downward rotation, and when it comes into contact with the lock position, the impact is interfered with.

[0027]

Since the present invention is constructed as described above,
The following effects are achieved.

That is, as described in claim 1, the bonnet covering the engine is configured to be openable and closable, and the elastic body for urging the bonnet in the direction of opening the bonnet is arranged between the bonnet and the main body side. Is urged upwards, reducing the force required to open the bonnet. Further, since the hood is biased upward, the bonnet is closed smoothly, and the bonnet suddenly lowers so that the worker is not impacted.

According to a second aspect of the present invention, since the elastic body is a torsion spring, and the torsion spring is arranged on the pivotal fulcrum shaft of the bonnet and biased in the direction of opening the bonnet, the bonnet is biased upward. , Rattling is prevented.

According to a third aspect of the present invention, the torsion spring is a double torsion spring, and both ends of the torsion spring are fixed to either the bonnet or the machine side, and the central fixing portion of the torsion spring is fixed to the other. The bonnet is biased upwards evenly on the left and right to prevent rattling.

Since the position adjusting mechanism is provided in the central fixed portion of the double torsion spring, the torque of the torsion spring can be adjusted.

Since the elastic member is used as a damper and is arranged between the inside of the bonnet and the support member provided on the engine, when the front end of the bonnet is pulled up by hand, the damper is moved upward. By urging the rotation to, the upward rotation operation force is reduced, and it can be held in the raised position. Then, when it is closed, downward rotation is suppressed by the damper, and when it comes into contact with the lock position, the impact is interfered.

According to a sixth aspect of the present invention, the elastic member is a spring, and the spring is externally fitted on a stand rod arranged between the inside of the bonnet and a support member provided on the engine. Therefore, when opening the bonnet. The urging force of the spring allows the bonnet to be opened with a small force, and even when the bonnet is closed, the locking part of the stand rod is released and the bonnet rotates downward due to its own weight. No, it can be closed while relieving shock.

[Brief description of drawings]

FIG. 1 is a side view showing an overall configuration of a tractor according to an embodiment of the present invention.

FIG. 2 is a side view showing the internal structure of the bonnet.

FIG. 3 is a side view showing the vicinity of a rotation fulcrum shaft of the bonnet.

FIG. 4 is a front view showing the vicinity of a rotation fulcrum shaft of the bonnet.

FIG. 5 is a diagram showing an operation panel.

FIG. 6 is a diagram showing an irradiation range of a spot lamp.

FIG. 7 is a side view of a cabin-type tractor.

FIG. 8 is a side view showing the vicinity of a rotation fulcrum shaft of the bonnet of the second embodiment.

FIG. 9 is a side view showing the vicinity of a rotation fulcrum shaft of the bonnet of the third embodiment.

FIG. 10 is a partial sectional side view showing a position adjusting mechanism of a torsion spring fixing portion.

[Explanation of symbols]

5 engine 6 bonnet 12 dashboard 24 spring 25 damper 27 Rotation fulcrum shaft 36 volts 40 elastic body 71 Stand Rod

Claims (6)

[Claims] 1. A hood opening / closing mechanism for a tractor, wherein a hood covering an engine is configured to be openable / closable, and an elastic body for urging the hood in a direction of opening the hood is disposed between the hood and a main body side. . 2. The bonnet opening / closing of a tractor according to claim 1, wherein the elastic body is a torsion spring, and the torsion spring is arranged on a rotation fulcrum shaft of the bonnet and is biased in a direction of opening the bonnet. mechanism. 3. The torsion spring is a double torsion spring, and both ends of the torsion spring are fixed to either the bonnet or the machine side, and a central fixing portion of the torsion spring is fixed to the other. The bonnet opening / closing mechanism of the tractor according to Item 2. 4. The bonnet opening / closing mechanism for a tractor according to claim 3, wherein a position adjusting mechanism is provided at a central fixed portion of the double torsion spring. 5. The hood opening / closing mechanism for a tractor according to claim 1, wherein the elastic member is a damper and is arranged between the inside of the bonnet and a support member provided on the engine. 6. The tractor according to claim 1, wherein the elastic member is a spring, and the spring is externally fitted and arranged on a stand rod arranged between the inside of the bonnet and a support member provided on the engine. Bonnet opening and closing mechanism.