JP2019026053A - Tractor - Google Patents

Abstract

To solve a problem that a grommet, which encloses a suction cylinder protruding from an engine hood and connected to a pre-cleaner case and is formed by an annular elastic body, needs to be removed during maintenance work of an engine etc. in which the engine hood is opened, resulting in burdensome work.SOLUTION: In a tractor, an engine E mounted on a vehicle body 3, a radiator 23 which cools a coolant of the engine E, and an air cleaner 22 which purifies intake air to the engine E are installed in an engine hood 5. The structure of the tractor is characterized in that the air cleaner 22 is attached to a radiator support frame 20, an external intake cylinder 16 oriented from the air cleaner 22 onto the engine hood 5 is supported by the radiator support frame 20, and an intake cylinder 7 of a pre-cleaner case 6 which houses a pre-cleaner is fitted into the external intake cylinder 16 from above to be detachably attached thereto.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a tractor that performs tillage work or the like in a field, and more particularly, to a precleaner mounting structure for a tractor.

  The tractor covers the engine mounted on the front part of the vehicle running on the front and rear four wheels, provides a bonnet, provides a control seat for the operator to ride on the rear, and carries a rotary work machine etc. on the rear of the vehicle To do.

  The air cleaner that performs intake to the engine mounted on the tractor is provided at the upper portion of the intake cylinder provided so as to protrude upward from the bonnet as described in Patent Document 1 so as to prevent the dust generated in the field work from being sucked in as much as possible. The air is sucked through the precleaner.

JP 2004-299635 A

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

  In view of the above-described problems of the conventional tractor, the present invention is a tractor for introducing outside air to the air cleaner via the precleaner on the bonnet, and assures the vehicle body support of the precleaner with a simple configuration and opens the bonnet. In this case, the pre-cleaner can be easily removed and the maintenance work of the engine in the bonnet can be easily performed.

  The above conventional problem is solved by the following technical means.

The invention of claim 1 includes an engine (E) mounted on a vehicle body (3), a radiator (23) for cooling cooling water of the engine (E), and an air cleaner for purifying intake air to the engine (E). In the tractor for mounting (22) in the hood (5),
The air cleaner (22) is attached to the radiator support frame (20), and the outer intake cylinder (16) facing the bonnet (5) from the air cleaner (22) is supported by the radiator support frame (20). The tractor is characterized in that an intake cylinder (7) of a precleaner case (6) for storing a precleaner is fitted to the outer intake cylinder (16) from above and is detachably attached.

  According to a second aspect of the present invention, the lower portion of the intake cylinder (7) is configured as an inner and outer insertion inner cylinder (7a) and an insertion outer cylinder (7b), and the insertion inner cylinder (7a) and the insertion outer 2. The tractor according to claim 1, wherein the outer intake cylinder (16) is fitted into and integrally connected to a gap between the cylinders (7 b).

  According to a third aspect of the present invention, the upper part of the insertion cylinder (7b) and the intake cylinder (7) have substantially the same diameter, and the lower part of the intake cylinder (7) is processed to form the insertion inner cylinder (7a). The tractor according to claim 2, wherein

  In the first aspect of the invention, the radiator support frame 20 is supported by the vehicle body 3 separately from the engine and hardly receives vibrations of the engine. However, by supporting the air cleaner 22 and the outer intake cylinder 16 on the radiator support frame 20. This simplifies the component structure and reduces manufacturing costs.

  In the invention of claim 2, in addition to the effect of claim 1, the connection is strengthened by fitting the outer intake cylinder 16 in the gap between the insertion inner cylinder 7a and the insertion outer cylinder 7b of the intake cylinder 7. The support of the outer intake cylinder 16 is stable, and there is no possibility that the intake cylinder 7 of the precleaner case 6 is detached during the tractor operation.

  In the invention of claim 3, in addition to the effects of claim 1 or claim 2, the straight shape of the intake cylinder 7 protruding from the bonnet 5 makes the appearance good.

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

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. In the description of the embodiments, the left and right directions are referred to as left and right, respectively, and the forward direction is referred to as the forward direction and the backward direction is referred to as the rear direction, 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 hood 5 on which an operator gets on a vehicle body 3 that travels with left and right front wheels 1, 1 and left and right rear wheels 2, 2. In the cabin 4, control devices such as a cockpit 24 and a handle are provided. Furthermore, a part of the engine E, the radiator 23, the hydraulic pump, and the transmission 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 transmission case 40). The left and right rear wheels 2, 2 are covered with strong fenders 52 that enter the cabin 4 at the top. The rear wheel 2 is preferably a heavy cast disc and a wide tire that has a strong traction.

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

  Side doors 9, 9 with lifts 15 and lifting steps 11, 11 are provided on the left and right sides of the cabin 4, side mirrors 10, 10 are provided on the upper left and right of the front window 13, and the front on the upper left and right of the front window 13 Are provided. Reference numeral 12 denotes a fuel supply cap.

  2 and 3 show a mounting support portion of the precleaner case 6 in which the precleaner 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 by the radiator support frame 20 on the front side of the engine. I support it. An intake bracket 18 provided with an inner intake cylinder 17 that communicates with an intake port 22a of the air cleaner 22 and an outer intake cylinder 16 that stands up is attached to an air cleaner support bracket 22b that connects the radiator support frame 20 and the air cleaner 22 with bolts 19. Yes. Reference numeral 22 c is a connecting pipe that connects the air cleaner 22 and the engine E.

  In other words, the inner intake cylinder 17 is configured below the intake bracket 18 and the outer intake cylinder 16 is configured above the intake bracket 18, but the center of the outer intake cylinder 16 is relative to the center of the inner intake cylinder 17. Is displaced about 1 cm to the right. This is because it is not necessary to change the design of the hood 5. On the upper part of the bonnet 5 of the type where the precleaner case 6 is not provided, a hole for taking in cooling air is opened and a net is attached. Since the precleaner case 6 is configured to be attachable only by forming a hole in the net portion, it is not necessary to change the design of the bonnet 5. Even if the displacement is configured, there is no problem because the amount of intake air can be secured about 80%.

  The intake cylinder 7 has a cylindrical portion of the pre-cleaner case 6 fitted on the upper portion thereof and fastened with a band 21 and is attached to the lower portion of the inner cylinder 7a with a small diameter. The insertion outer cylinder 7b is tightly welded to the intake cylinder 7 at the top. Since the lower portion of the intake cylinder 7 is drawn into 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.

  When the outer intake cylinder 16 is inserted into the gap between the insertion inner cylinder 7a and the insertion outer cylinder 7b so as to support the intake cylinder 7, it is stably held without providing a fixture and the bonnet 5 is opened. In this case, the pre-cleaner case 6 does not interfere with maintenance by quickly removing the intake cylinder 7 upward without using a tool.

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

  In order to ensure forward visibility when seated on the cockpit 24, the precleaner case 6 was configured at a relatively high position. It arrange | positioned from the upper surface of the bonnet 5 about 25 cm. Further, in order to stabilize the precleaner case 6, the number of parts was reduced to reduce the weight.

  FIG. 4 is an internal perspective view of the cabin 4, and a main transmission lever 26 and a sub transmission lever 27 erected from the step floor 25 are provided on the right side portion of the cockpit 24, and the right side panel 28 attached to the right fender 52 is provided. A working machine height adjustment lever 29, an automatic lifting switch 30, and an external hydraulic operation lever 31 are provided. The automatic lifting / lowering switch 30 has a function of automatically raising the work implement to reduce the load when the load applied to the work implement increases, and the range of elevation can be adjusted by the dial. As 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, and the back and forth movement due to torsion of the torsion bar is detected by an angle sensor, and an upward signal is output to the hydraulic valve 37 at a certain angle or more. To do. When automatic lifting is not required, the upper link and mounting bracket are connected with pins to suppress torsion bar twisting.

  Two rows of guide grooves are provided next to the external hydraulic operation lever 31, and second and third external hydraulic output levers can be added to the guide grooves.

  FIG. 5 is a perspective view showing attachment of the external hydraulic operation lever 31. The external hydraulic operation lever 31 is pivotally supported on the lever shaft 33 provided on the shaft support portion 32 of the lever bracket 35 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 31 d of the external hydraulic operation lever 31. The hydraulic operation wire 34 is a waterproof push cable, and the position of the outer wire relative to the inner wire is adjusted by an 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 operation lever 31a. The first external hydraulic operation lever 31a and the third external hydraulic operation lever 31c are preferably bent outward, and the second external hydraulic operation lever 31b is straight and easy to operate. Since the third external hydraulic operation lever 31c is mounted in the same configuration as 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. The left and right sides for attaching the three-point link for mounting the work machine to the rear portion of the mission case 40 integrally assembled with the rear wheel flange 43 for mounting the left and right rear wheels 2 are shown. Hitches 42L and 42R are provided, and left and right lift arms 41L and 41R pivotally supported on the upper portions thereof 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 transmission 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.

  If the lifting force of the lift cylinder 39 is insufficient, a second lift cylinder may be added between the right lift arm 41R and the right hitch 42R, and a third lift 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 against scattering parts such as stones. The second elevating cylinder and the third elevating cylinder may be configured such that the rod is pivotally supported on the left lift arm 41L and the cylinder side is inserted into the left hitch 42L with a pin. The hydraulic circuits of the second lifting cylinder and the third lifting cylinder are hydraulic circuits in parallel with the lifting cylinder 39.

  FIG. 7 is a perspective view of the hydraulic valve 37, and an L-shaped valve arm 46 in a side view is pivotally supported on a pivot pin 47 provided on the valve bracket 51, and the hydraulic valve 37 is inserted into an elongated hole on one end side of the valve arm 46. A connection pin 49 connected to the spool 48 is connected by a 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 three-point link left and right lower links 44L and 44R are connected by adjustable left and right connecting rods 45L and 45R, and the left and right lift arms 41R and 41L are moved up and down. The work machine connected to the point link is raised and lowered. The left and right lift arms 41L and 41R change the thickness according to the weight of the work implement, and the left and right connecting rods 45L and 45R change the rod diameter according to the weight of the work implement. The left and right connecting rods 45L and 45R may be provided with anti-rotation pipes.

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

Claims (3)

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 intake air to the engine (E) are connected to a bonnet (5 ) In the tractor mounted in
The air cleaner (22) is attached to the radiator support frame (20), and the outer intake cylinder (16) facing the bonnet (5) from the air cleaner (22) is supported by the radiator support frame (20). A tractor characterized in that an intake cylinder (7) of a precleaner case (6) for storing a precleaner is fitted to the outer intake cylinder (16) from above and is detachably attached.   The lower part of the intake cylinder (7) is configured as an inner and outer insertion inner cylinder (7a) and an insertion outer cylinder (7b), and is formed in a gap between the insertion inner cylinder (7a) and the insertion outer cylinder (7b). The tractor according to claim 1, wherein the outer intake cylinder (16) is fitted and integrally connected. The upper part of the insertion cylinder (7b) and the intake cylinder (7) have substantially the same diameter, and the lower part of the intake cylinder (7) is processed into the insertion inner cylinder (7a). The tractor according to claim 2.

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