JP2005306055A - Hood structure of tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance rigidity of a hood by inexpensive structure when constituting a vertically dividing type hood in a hood structure of a tractor having the hood for storing an engine constituted of a lower part hood provided with an opening for ventilation on a front end face and an upper part hood arranged on the lower part hood. <P>SOLUTION: A fulcrum metal fitting 44 is rotatably mounted around a lateral shaft fulcrum (x) in a front part of a machine body frame for mounting and supporting the engine. A lower end part of a stay 46 stood and arranged in the front part in the hood 14 and a front part lower end of the lower part hood 14L are mutually connected with bolts to the fulcrum metal fitting 44. A front part of the upper part hood 14U is connected to an upper part of the stay 46. The hood 14 that the lower part hood 14L and the upper part hood 14U are integrated is constituted to oscillate, open and close around the lateral shaft fulcrum (x). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bonnet structure of a relatively small tractor used for a mower or the like.

As a bonnet structure of a tractor used for a mowing machine, for example, as shown in Patent Document 1 or Patent Document 2, an entire bonnet covering an engine mounted on the front part of the body is centered on a fulcrum at the lower front end. The one that swings up and down is known.
JP-A-8-142703 (FIG. 1) JP-A-9-112266 (FIG. 3)

  In the above conventional structure, since the entire bonnet is opened, the engine can be greatly exposed, and the engine maintenance work can be easily performed from a large surrounding space. Therefore, if the bonnet is of an integral structure, it is difficult to implement unless the bonnet volume is a relatively small model due to mold cost and the like.

  In addition, as a means for constituting a relatively large bonnet, it is considered that the bonnet is divided into a lower bonnet and an upper bonnet, and these are connected and integrated. It is necessary to firmly connect the bonnet connected to the upper bonnet and increase the rigidity of the entire bonnet. For this reason, it is necessary to introduce a number of reinforcing means such as reinforcing ribs and metal fittings. There was a disagreement that could not be demonstrated. In particular, an opening for ventilation and an opening for assembling a headlight are formed at the front part of the bonnet on the fulcrum side of the swing opening and closing, and the rigidity tends to be further lowered.

  The present invention has been made paying attention to such points, and an object of the present invention is to make it possible to increase the rigidity of the bonnet with an inexpensive structure when configuring the bonnet of the upper and lower division type.

1st invention is the bonnet structure of the tractor which comprised the bonnet which accommodated the engine with the lower bonnet provided with the opening for ventilation | gas_flowing in the front end surface, and the upper bonnet arrange | positioned on this lower bonnet,
A fulcrum bracket is attached to the front of the fuselage frame that supports the engine so that it can rotate around the fulcrum of the horizontal axis, and the lower end of the stay erected at the front of the bonnet and the lower front of the lower bonnet The bolt is connected to the fulcrum bracket in the tightened state, the front part of the upper bonnet is connected to the upper part of the stay, and the bonnet in which the lower bonnet and the upper bonnet are integrated is configured to be swingable around the horizontal axis fulcrum. It is characterized by being.

  According to the above configuration, the stay erected on the front part in the bonnet is a bracket that connects the lower bonnet and the fulcrum bracket, and also functions as a bracket that integrates the lower bonnet and the upper bonnet. The external force acting on the front part of the upper bonnet is supported by the fulcrum metal via the stay.

  Therefore, according to the first invention, the rigidity of the bonnet can be increased with an inexpensive structure that effectively uses the stay in configuring the bonnet of the upper and lower split type.

According to a second invention, in the first invention,
A louver facing the opening of the lower bonnet from the inside is supported by the stay.

  According to the above configuration, the opening of the lower bonnet may have a simple shape, and the lower bonnet mold can be manufactured at a lower cost compared to the case where a large number of openings in which the louvers are integrally formed are provided.

According to a third invention, in the first or second invention,
A lower front end of the upper bonnet and a front upper end of the lower bonnet are bolted to the upper end of the stay while being fastened together.

  According to the said structure, the front part of a lower bonnet will be bridge-connected by the stay by the stay, and the rigidity of the front part in a lower bonnet will become high.

A fourth invention is the invention according to any one of the first to third inventions,
The stay includes a central stay portion that is erected at a left and right central portion of the lower bonnet, and a side stay portion that is erected at a left and right location behind the central stay portion, and the louver is connected to the central stay portion and the left and right side portions. A plurality of upper and lower stages are installed and supported across the stay, and a connection support portion of the upper bonnet is connected to the upper end portion of the central stay portion.

  According to the above configuration, the stay composed of the central stay portion and the left and right side stay portions and the upper and lower louvers are connected to each other to supplement the strength of each other. The rigidity of the front part of the bonnet supported by this structure is high.

  FIG. 1 is an overall side view of a riding mower according to the present invention, and FIG. 2 is an overall plan view thereof. This riding-type mower has a front-link 4a and a rear-link 4b at the lower part of a riding-type traveling machine body 3 configured as a four-wheel drive type in which the front wheel 1 to be steered and the rear wheel 2 whose orientation is fixed are respectively driven. The mower 5 is suspended and connected through the four-link mechanism 4 so as to be movable up and down, and the grass collected by the mower 5 is conveyed to the rear of the machine via the duct 6 and connected to the rear of the machine. 7 to collect.

  A front axle case 9 is mounted in a rollable manner below the front part of the fuselage frame 8 that is arranged long in the front and rear direction along the lower part of the traveling vehicle body 3, and the front wheels 1 equipped at the left and right ends of the front axle case 9 are The steering cylinder 10 mounted on the front axle case 9 is steered. A water-cooled engine 12 equipped with a radiator 11 at the rear is mounted and supported at the upper front part of the body frame 8, and a front cover 13 and a bonnet 14 are provided to cover them. A transmission case 15 having rear wheels 2 on the left and right is connected to the rear part. Further, a step 16 is mounted and supported on the upper part of the body frame 8, and a driver seat 17 is disposed between the left and right rear wheel fender portions 16 a provided continuously to the rear portion of the step 16.

  The front portion of the step 16 extends forward so as to wrap around the left and right sides of the base portion of the front cover 13, so that the operator seated on the driver seat 17 can drive in an easy posture with both legs extended. At the front part on the right side of step 16, a shift pedal 18 for performing forward / reverse switching and a continuously variable transmission and a brake pedal 19 for stopping traveling are provided.

  FIG. 3 shows an outline of the transmission system. As shown in the figure, the power output from the engine 12 is transmitted from the front to the input shaft 22 of the transmission case 15 via the transmission shaft 21, and is branched into a traveling system and a working system in the case. The input shaft 22 is butt-coupled to an input pump shaft 23a of a hydraulic continuously variable transmission (HST) 23 connected to the rear surface of the transmission case 15 and capable of forward / reverse switching. The motive power input to is output continuously from the output motor shaft 23b for forward or reverse travel, and is output from the output motor shaft 23b. The output gear G1, gear G2, bevel gears G3 and G4, and gears G5 and G6 It is converted into rotational power and transmitted to the horizontally long rear wheel drive shaft 24, and then distributed to the left and right rear wheels 2 through left and right side clutches and reduction gears (not shown) from the rear wheel drive shaft 24. It has become. Further, the transmission power extracted from the output motor shaft 23b of the continuously variable transmission 23 is transmitted to the front wheel drive shaft 25 via the output gear G9 and the gear G10, and the power extracted from the front wheel drive shaft 25 to the front of the case. Is transmitted to the differential mechanism 28 of the front axle case 8 via transmission shafts 26, 27 extending forward along the lower part of the vehicle body so that the front wheel 1 is driven at a speed synchronized with the rear wheel 2. It has become.

  The continuously variable transmission 23 incorporates an axial plunger variable displacement pump 23P driven by the input motor shaft 23a and an axial plunger fixed displacement motor 23M that drives the output motor shaft 23b. The input motor shaft 23a, which is always driven, projects through and protrudes rearward, and a cooling fan 29 for the continuously variable transmission 23 is attached to the protruding end, and an output motor shaft is provided at the rear of the continuously variable transmission 23. A traveling brake 30 acting on 23 b is provided and linked to the brake pedal 19.

  Further, a speed change operation unit for changing the rotation speed and the rotation direction of the output motor shaft 23b by changing the swash plate angle of the variable capacity pump 23P is provided on the left side surface of the continuously variable transmission 23. A speed change operation unit is linked to the speed change pedal 18. The speed change pedal 18 is configured so that it can be stepped forward and backward, and the forward speed can be increased by depressing it forward, the reverse speed can be increased by depressing it backward, and the speed change pedal 18 can be neutralized by releasing the depressing position. It automatically returns to the position.

  Further, a part of the power transmitted to the input shaft 22 is taken out as working system power by the gear G11, transmitted to the PTO clutch 31 via the gears G12 and G13, and then projected on the front surface of the case 32. And is transmitted to the input case 34 provided on the upper surface of the deck of the mower 5 through the transmission shaft 33. Further, a part of the power transmitted to the input shaft 22 is transmitted upward via gears G14 and G15, and serves as a hydraulic pressure source for moving up and down the mower, for power steering, and for charging the continuously variable transmission 23. The hydraulic pump P is driven.

  A steering handle 36 is supported on the front cover 13 erected from the airframe at the front of the step 16, and a hydraulic controller 37 that is operated by the steering handle 36 is incorporated. A power steering structure is constructed in which pressure oil is supplied to the steering cylinder 10 to steer the front wheels 1 in accordance with the direction of movement and the amount of operation.

  As shown in FIGS. 4 to 7, the bonnet 14 disposed in front of the front cover 13 includes a resin-formed lower bonnet 14L and a resin-molded upper bonnet 14U connected to the lower bonnet 14L. A pair of left and right large openings 41 for ventilation are formed at the front end of the lower bonnet 14L, and an opening 43 into which a pair of left and right headlights 42 are incorporated is provided at the front of the upper bonnet 14U.

  On the left and right sides of the front portion of the body frame 8, fulcrum brackets 44 are attached so as to be pivotable about the horizontal axis fulcrum x, and the lower flange 14a extending inwardly along the lower end side of the lower bonnet 14L. The fulcrum bracket 44 is mounted on a mounting portion 44 a bent and extended from the upper end of the fulcrum bracket 44 and is fastened and connected by a bolt 45. Further, a stay 46 made of a metal plate material is erected on the inner side of the front portion of the bonnet 14, and is connected to the left and right fulcrum brackets 44 together.

  As shown in FIG. 8, the stay 46 includes an arcuate base material 46a along the lower end side of the lower bonnet 14L, a central stay portion 46b erected at the left and right central portions of the base material 46a, and a central stay portion 46b. It is composed of a pair of left and right side stay portions 46c erected from the base material 46a at the left and right positions at the rear, and the left and right end portions of the base material 46a are superimposed on the flange portion 14a of the lower bonnet, The bolt 45 is connected to the fulcrum bracket 44 together.

  Further, a louver 47 made of a metal plate is provided in two upper and lower stages so as to face the opening 41 of the lower bonnet 14L from the inside over the central stay portion 46b and the left and right side stay portions 46c of the stay 46. The louver 47 has a planar shape that is substantially arcuate along the inner periphery of the front part of the lower bonnet 14L, and the entire louver is disposed so as to be inclined forward and the rear end side 47a of each louver 47 is obliquely upward. The hot air that is refracted and sent forward from the inside of the hood is guided forward and downward, and the thickness of the opening 41 that is opened as viewed from the front of the louver 47 is increased to adjust the appearance of the opened opening 41.

  A horizontally long arm-like connecting support portion 46d is connected to the upper end of the central stay portion 46b, and an upper flange 14b extending inwardly from the front upper end of the lower bonnet 14L is connected to the connecting support portion 46d. The bolts 48 are tightened and attached to the connecting boss portions 14c formed at the lower front end of the upper bonnet 14U in a stacked state, whereby the upper end of the stay 46, the upper front portion of the lower bonnet 14L, and the upper bonnet 14U The lower part of the front end is connected together.

  A bridge portion 14d provided at the upper rear end of the lower bonnet 14L is connected to a connecting boss portion 14f formed at the rear end of the upper bonnet 14U by a pair of bolts 49, so that the lower bonnet 14L and the upper bonnet 14U are connected. Are combined in the front and rear to form an integrated bonnet 14, and the integrated bonnet 14 can swing up and down around the horizontal axis fulcrum x via the fulcrum bracket 44. .

  The lower half of the rear bonnet 14L is cut out in accordance with the front extending shape of the front cover 13, and the front part of the lower part of the lower bonnet 14L is a front part of the step that wraps around the left and right of the front cover 13. A projecting portion 14e having a shape that is smoothly connected to the outer shape extends backward. Since this overhanging portion 14e moves upward when the hood is opened, the engine periphery is greatly opened so that maintenance work can be easily performed.

Overall side view of riding mower Overall plan view of a riding mower Schematic diagram of transmission system Bonnet side view Vertical side view showing the front of the bonnet A longitudinal front view showing the front of the bonnet Disassembled perspective view of bonnet Perspective view of stay

Explanation of symbols

8 Airframe frame 12 Engine 14 Bonnet 14L Lower bonnet 14U Upper bonnet 41 Opening 44 Support metal fittings 46 Stay 46b Central stay 46c Side stay 46d Connection support x Horizontal support

Claims (4)

The bonnet structure of the tractor which comprised the bonnet which accommodated the engine with the lower bonnet provided with the opening for ventilation in the front end surface, and the upper bonnet arranged on this lower bonnet,
A fulcrum bracket is attached to the front of the fuselage frame that supports the engine so that it can rotate around the fulcrum of the horizontal axis, and the lower end of the stay erected at the front of the bonnet and the lower front of the lower bonnet The bolt is connected to the fulcrum bracket in the tightened state, the front part of the upper bonnet is connected to the upper part of the stay, and the bonnet in which the lower bonnet and the upper bonnet are integrated is configured to be swingable around the horizontal axis fulcrum. The bonnet structure of the tractor characterized by     The bonnet structure for a tractor according to claim 1, wherein a louver facing the opening of the lower bonnet from the inside is supported by the stay.     The bonnet structure for a tractor according to claim 1 or 2, wherein a front end lower part of the upper bonnet and a front end upper part of the lower bonnet are bolted to an upper end part of the stay together. The stay includes a central stay portion that is erected at a left and right central portion in the lower bonnet, and a side stay portion that is erected at a left and right portion behind the central stay portion, and the louver is disposed on the left and right sides of the central stay portion. 4. The connection support part of the upper bonnet is connected to the upper end part of the central stay part, and is supported in a plurality of stages on the upper and lower sides over the side stay. The bonnet structure of the tractor as described in the paragraph.

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