JP6816673B2 - Tractor - Google Patents

Description

The present invention relates to a tractor for tilling work in a field, and particularly to a pre-cleaner mounting structure of the tractor.

The tractor has a bonnet that covers the engine mounted on the front part of the vehicle body that runs on four front and rear wheels, a driver's seat on the rear part where workers can board and operate, and a rotary work machine etc. on the rear part of the vehicle body. To do.

As described in Patent Document 1, the air cleaner that draws air into the engine mounted on the tractor protrudes upward from the bonnet in order to prevent the dust generated in the field work from being sucked in as much as possible. The air is taken in through the pre-cleaner.

Japanese Unexamined Patent Publication No. 2004-299635

In the conventional tractor, since the intake cylinder protruding from the bonnet is surrounded by the grommet which is an annular elastic body, the grommet must be removed at the time of engine maintenance work performed by opening the bonnet, which is troublesome. ..

In view of the above problems of the conventional tractor, in a tractor that introduces outside air to the air cleaner via the pre-cleaner on the bonnet, the vehicle body support of the pre-cleaner is ensured with a simple configuration and the bonnet is opened. The purpose is to make it easy to remove the pre-cleaner and to facilitate maintenance work such as the engine inside the bonnet.

The above-mentioned conventional problems are solved by the following technical means.

The invention of claim 1 is
A radiator that cools the engine (E) mounted on the vehicle body (3) and the cooling water of the engine (E).
The eta (23) and the air cleaner (22) that purifies the intake air to the engine (E)
In the tractor installed in the net (5)
The air cleaner (22) is attached to the radiator support frame (20), and the d.
The external intake cylinder (16) directed from the arc cleaner (22) onto the bonnet (5) is
It is supported by the eta support frame (20), and the pre-cleaner is stored in the external intake cylinder (16).
The intake cylinder (7) of the pre-cleaner case (6) is fitted from above and detachably attached.
The lower part of the intake cylinder (7) is configured as an inner / outer plug-in inner cylinder (7a) and a plug-in outer cylinder (7b).
The tractor is characterized in that the outer intake cylinder (16) is fitted into the gap between the insertion inner cylinder (7a) and the insertion outer cylinder (7b) and integrally connected.
The invention of claim 2 is
The insertion outer cylinder (7b) and the upper part of the intake cylinder (7) have substantially the same diameter, and the intake cylinder (7)
The torak according to claim 1, wherein the lower part of the torak is processed into the insertion inner cylinder (7a).
It is.
In the first invention related to the present invention, the engine (E) mounted on the vehicle body (3), the radiator (23) for cooling the cooling water of the engine (E), and the intake air to the engine (E) are supplied. In the tractor in which the air cleaner (22) to be purified is installed in the bonnet (5).
The air cleaner (22) is attached to the radiator support frame (20), and the external intake cylinder (16) directed from the air cleaner (22) toward the bonnet (5) is supported by the radiator support frame (20). The tractor is characterized in that the intake cylinder (7) of the pre-cleaner case (6) for accommodating the pre-cleaner is fitted from above with respect to the external intake cylinder (16) and attached detachably.

In the second invention related to the present invention, the lower portion of the intake cylinder (7) is configured as an inner / outer insertion inner cylinder (7a) and an insertion outer cylinder (7b), and the insertion inner cylinder (7a) The tractor of the first invention related to the present invention is characterized in that the outer intake cylinder (16) is fitted into the gap of the insertion outer cylinder (7b) and integrally connected .

In the third invention related to the present invention, the insertion outer cylinder (7b) and the upper portion of the intake cylinder (7) have substantially the same diameter, and the lower portion of the intake cylinder (7) is processed to form the insertion. It is a tractor of the second invention related to the present invention, which is characterized by having an inner cylinder (7a).

In the invention of claim 1, the radiator support frame 20 is supported by the vehicle body 3 separately from the engine.
Although it is hard to receive the vibration of the engine, the air cleaner 22 and the external intake cylinder are attached to the radiator support frame 20.
By supporting 16, the component configuration can be simplified and the manufacturing cost can be reduced. Further, by fitting the outer intake cylinder 16 into the gap between the insertion inner cylinder 7a and the insertion outer cylinder 7b of the intake cylinder 7, the connection is strengthened and the support of the outer intake cylinder 16 is stabilized, and the pre-cleaner case 6 There is no possibility that the intake cylinder 7 of the above will come off during the tractor work.
In the invention of claim 2, in addition to the effect of the invention of claim 1, the straight shape of the intake cylinder 7 protruding from the bonnet 5 improves the appearance.
In the first invention related to the present invention, the radiator support frame 20 is supported by the vehicle body 3 separately from the engine and is less susceptible to engine vibration. However, the radiator support frame 20 is provided with an air cleaner 22 and an external intake cylinder 16. By supporting it, the component configuration can be simplified and the manufacturing cost can be reduced.

In the second invention related to the present invention, in addition to the effect of the first invention related to the present invention , the outer intake cylinder 16 is fitted in the gap between the insertion inner cylinder 7a and the insertion outer cylinder 7b of the intake cylinder 7. By fitting, the connection is strengthened, the support of the external intake cylinder 16 is stable, and there is no possibility that the intake cylinder 7 of the pre-cleaner case 6 will come off during the tractor work.

In the third invention related to the present invention, in addition to the effects of the first or second invention related to the present invention, the straight shape of the intake cylinder 7 protruding from the bonnet 5 improves the appearance.

It is a front perspective view of the tractor of the embodiment of this invention. It is a side view of a pre-cleaner case. It is a perspective view of the pre-cleaner case mounting part. It is a perspective view which looked at the inside of a cabin from the left front. It is a perspective view of the mounting part of the external hydraulic control lever. It is a perspective view which looked at the upper surface of a mission case from the left front. It is a perspective view of a hydraulic valve. It is a perspective view of the three-point link connection part of the rear part of a tractor.

Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. In the description of the embodiment, the left and right directions are referred to as left and right, the forward direction is referred to as forward, and the backward direction is referred to as rear toward the forward direction of the aircraft, but the configuration of the present invention is not limited.

As shown in FIG. 1, the tractor is provided with an engine E covered with a cabin 4 and a bonnet 5 on which an operator is boarded on a vehicle body 3 traveling on left and right front wheels 1 and 1 and left and right rear wheels 2 and 2. , A control device such as a driver's seat 24 and a steering wheel is provided in the cabin 4. Further, a part of the engine E, the radiator 23, the hydraulic pump, and the mission case 40 covered with the bonnet 5 is provided on the vehicle body 3. Left and right hitches 42L and 42R for mounting the work machine are provided at the rear part of the vehicle body 3 (rear part of the mission case 40). The left and right rear wheels 2 and 2 are covered with a strong fender 52 that enters the cabin 4 at the upper part. The rear wheel 2 is a heavy cast disc and is preferably a wide tire to increase traction.

A pre-cleaner case 6 containing a pre-cleaner is erected on the front right side of the bonnet 5 with an intake pipe 7, and an exhaust pipe 8 for discharging engine E exhaust is connected to the right side surface of engine E on the rear side of the bonnet 5. It is erected upward.

Side doors 9 and 9 with handles 15 and elevating steps 11 and 11 are provided on the left and right sides of the cabin 4, side mirrors 10 and 10 are provided on the upper left and right sides of the front window 13, and fronts are provided on the upper left and right sides of the front window 13. Work lights 14 and 14 are provided to illuminate. Reference numeral 12 is a fuel refueling cap.

2 and 3 show the mounting support portion of the pre-cleaner case 6 in which the pre-cleaner is installed, the engine E is mounted on the vehicle body 3 in the bonnet 5, and the radiator 23 is mounted on the vehicle body 3 on the front side of the engine by the radiator support frame 20. I support it. The intake bracket 18 provided with the inner intake cylinder 17 leading to the intake port 22a of the air cleaner 22 and the outer intake cylinder 16 standing above is attached to the air cleaner support bracket 22b connecting the radiator support frame 20 and the air cleaner 22 with bolts 19. There is. Reference numeral 22c is a connecting pipe that connects the air cleaner 22 and the engine E.

That is, the inner intake cylinder 17 is formed on the lower side of the intake bracket 18, and the outer intake cylinder 16 is formed on the upper side of the intake bracket 18, but the center of the outer intake cylinder 16 is relative to the center of the inner intake cylinder 17. It is displaced to the right by about 1 cm. This is because the design change of the bonnet 5 is not required. A hole for taking in cooling air is provided in the upper part of the bonnet 5 of a type in which the pre-cleaner case 6 is not provided, and a net is attached. Since the pre-cleaner case 6 can be attached only by making a hole in the net portion, it is not necessary to change the design of the bonnet 5. Even if the deviation is configured, there is no problem because the intake air amount can be secured to about 80%.

The intake cylinder 7 is attached by fitting the cylinder portion of the pre-cleaner case 6 to the upper portion and tightening it with a band 21 to form an insertion inner cylinder 7a having a small diameter at the lower portion, and having the same outer diameter as the intake cylinder 7 outside. The insertion outer cylinder 7b is closely welded to the intake cylinder 7 at the upper part. Since the lower part of the intake cylinder 7 is drawn to form the insertion inner cylinder 7a, an increase in the number of parts can be suppressed, and the outer diameter of the insertion outer cylinder 7b becomes larger than the outer diameter of the intake cylinder 7. Can be prevented.

Since the intake cylinder 7 is supported by inserting the outer intake cylinder 16 into the gap between the insertion inner cylinder 7a and the insertion outer cylinder 7b, it is stably held without a fixture and the bonnet 5 is opened. By quickly pulling out the intake cylinder 7 upward without using a tool, the pre-cleaner case 6 does not interfere with maintenance.

That is, there are an insertion inner cylinder 7a and an insertion outer cylinder 7b inside and outside the outer intake cylinder 16, respectively, a gap between the outer intake cylinder 16 and the insertion inner cylinder 7a, and an outer intake cylinder 16 and the insertion outside. Since the gap with the cylinder 7b is extremely short and is configured to be close to close contact, the pre-cleaner case 6 does not vibrate and is stable even during work in the field. If the insertion allowance of the external intake cylinder 16 is too long, it becomes difficult to insert and remove it. Therefore, the insertion allowance is set to about 5 cm.

The pre-cleaner case 6 is configured at a relatively high position in order to ensure forward visibility when seated in the driver's seat 24. It was arranged about 25 cm from the upper surface of the bonnet 5. Further, in order to stabilize the pre-cleaner case 6, the number of parts was reduced to reduce the weight.

FIG. 4 is an internal perspective view of the cabin 4. A main shift lever 26 and an auxiliary shift lever 27 standing upright from the step floor 25 are provided on the right side of the driver's seat 24, and the right side panel 28 attached to the right fender 52 is provided. , A work machine height adjusting lever 29, an automatic lifting switch 30, and an external hydraulic operation lever 31 are provided. The automatic lift switch 30 is a function that automatically raises the work machine to reduce the load when the load applied to the work machine increases, and the rise width can be adjusted by the dial. For the load of the work equipment, the upper link of the three-point link and the mounting bracket are connected by a torsion bar, the front-back movement due to the twist of the torsion bar is detected by the angle sensor, and a rising signal is output to the hydraulic valve 37 at an angle above a certain level. To do. If automatic lifting is not required, connect the upper link and the mounting bracket with a pin to prevent the torsion bar from twisting.

Two rows of guide grooves are provided next to the external hydraulic control lever 31, and it is possible to add second and third external hydraulic output levers to the guide grooves.

FIG. 5 is a perspective view showing the attachment of the external hydraulic control lever 31, and the external hydraulic control lever 31 is pivotally supported by the lever shaft 33 provided on the shaft support 32 of the lever bracket 35 to be attached to the right fender 52 in the right side panel 28. , The hydraulic operation wire 34 connected to the spool of the hydraulic valve 37 is connected to the wire attachment portion 31d of the external hydraulic operation lever 31. The hydraulic operation wire 34 is a waterproof push cable, and the position of the outer wire with respect to the inner wire is adjusted by the adjustment nut 36 attached to the wire receiver 35b to adjust the interlocking of the external hydraulic operation lever 31 and the hydraulic valve 37.

The lever bracket 35 has a width that allows the second and third external hydraulic output levers 31b and 31c to be added side by side in addition to the external hydraulic control lever 31a. It is preferable that the first external hydraulic control lever 31a and the third external hydraulic control lever 31c are bent outward, and the second external hydraulic control lever 31b is straight for easy operation. Since the mounting configuration of the third external hydraulic control lever 31c is the same as that of the second and third external hydraulic output levers 31b and 31c, the detailed configuration is omitted.

FIG. 6 is a perspective view of the rear side of the mission case 40. Left and right to attach a three-point link for mounting a work machine to the rear of the mission case 40 in which the rear wheel flanges 43 for mounting the left and right rear wheels 2 are integrally assembled. Hitches 42L and 42R are provided, and left and right lift arms 41L and 41R that are pivotally supported above the hitches 42L and 42R are configured. An elevating cylinder 39 is attached between the left lift arm 41L and the left hitch 42L, and the hydraulic valve 37 provided on the valve bracket 51 attached to the rear upper part of the mission case 40 and the elevating cylinder 39 are connected by a hydraulic hose 38 wound with a protective coil. ing. The hydraulic valve 37 controls the flow of pressure oil from the hydraulic pump in the mission case 40.

When the ascending force of the elevating cylinder 39 is insufficient, a second elevating cylinder may be added between the right lift arm 41R and the right hitch 42R, and a third elevating cylinder may be added. The second elevating cylinder and the third elevating cylinder are branched from the cylinder case of the elevating cylinder 39 by an adapter, and are connected by a hydraulic hose with a protective spring that protects from scattered parts such as stones. For the second elevating cylinder and the third elevating cylinder, the rod may be pivotally supported by the left lift arm 41L, and the cylinder side may be inserted into the left hitch 42L with a pin. Further, the hydraulic circuits of the second elevating cylinder and the third elevating cylinder shall be a hydraulic circuit parallel to the elevating cylinder 39.

FIG. 7 is a perspective view of the hydraulic valve 37, in which an L-shaped valve arm 46 viewed from the side is pivotally supported by a pivot pin 47 provided on the valve bracket 51, and the hydraulic valve 37 is placed in a long hole on one end side of the valve arm 46. The connecting pin 49 to be connected to the spool 48 is connected by the snap pin 50. When the hydraulic operation wire 34 connected to the other end of the valve arm 46 is pulled, the spool 48 slides to control the expansion / contraction operation of the elevating cylinder 39.

In FIG. 8, the left and right lift arms 41L and 41R and the left and right lower links 44L and 44R of the three-point link are connected by the left and right connecting rods 45L and 45R whose lengths can be adjusted, and the left and right lift arms 41R and 41L are rotated up and down. Raise and lower the work equipment connected to the point link. The thickness of the left and right lift arms 41L and 41R is changed according to the weight of the working machine, and the rod diameters of the left and right connecting rods 45L and 45R are changed according to the weight of the working machine. The left and right connecting rods 45L and 45R may be equipped with a rotation prevention pipe.

E Engine 3 Body 5 Bonnet 6 Pre-cleaner case 7 Intake cylinder 7a Plug-in inner cylinder 7b Plug-in outer cylinder 16 Outer intake cylinder 20 Radiator support frame 22 Air cleaner 23 Radiator

Claims (2)

The bonnet (5) includes an engine (E) mounted on the vehicle body (3), a radiator (23) for cooling the cooling water of the engine (E), and an air cleaner (22) for purifying the intake air to the engine (E). ) In the tractor installed in
The air cleaner (22) is attached to the radiator support frame (20), and the external intake cylinder (16) directed from the air cleaner (22) toward the bonnet (5) is supported by the radiator support frame (20). the outer inlet pipe (16) the inlet pipe of the pre-cleaner case (6) for accommodating the precleaner (7) fitted from above combined with respect to configuration installed in the detachable,
The lower part of the intake cylinder (7) is configured as an inner / outer plug-in inner cylinder (7a) and a plug-in outer cylinder (7b).
A tractor characterized in that the outer intake cylinder (16) is fitted into a gap between the insertion inner cylinder (7a) and the insertion outer cylinder (7b) and integrally connected . The insertion outer cylinder (7b) and the upper part of the intake cylinder (7) have substantially the same diameter, and the intake cylinder (7)
The tractor according to claim 1 , wherein the lower part of the tractor is processed into the insertion inner cylinder (7a).

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