JPH048630A - Agricultural tractor - Google Patents

Abstract

PURPOSE:To locate an engine, power transmission case, and seat in such a fashion not overlapped one over another and suppressing the vehicle height by placing a vehicle body cover wherein the covering part for engine located on one side of the transmission case is positioned high and the covering part for a stamping plate and seat on the opposite side is positioned low, arranging control levers, etc., over the transmission case, and thereby embodying a less tall structure. CONSTITUTION:A vehicle body cover C is placed under a steering wheel 28 and seat S so as to enclose a battery 7, power transmission case in a T-form with single side flange missing, engine E, and radiator R. The cover C is so arranged that the engine covering part C1 enclosing the side of the engine E is positioned high and that the step/seat covering part C2 enclosing the step and seat S are positioned low oppositely. The part over the transmission case between the covering parts C1, C2 is also positioned low. Besides them, a front and a rear PTO clutch lever 71, 71, a main shift lever 32, front wheel driving clutch lever 72, aux. shift lever 76 and hydraulic lift lever 73 are furnished. The top of levers, etc., shall be positioned lower than the oversurface of the covering part C1 so that any part does not hitch with twigs of a fruit tree.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to an agricultural tractor with a low center of gravity that is used for special applications such as on sloped areas.

(b) Prior Art Regarding a low-center-of-gravity type tractor crane that is mainly used for work on sloping ground, the technology described in Japanese Patent Application Laid-open No. 169402/1983 has been known for a long time.

Furthermore, the technique of dividing the clutch housing into two chambers by providing a wall inside the clutch housing is known as the technique described in Japanese Utility Model Application Publication No. 55-32245.

(C) Problems to be Solved by the Invention In conventional low center of gravity tractors for use on slopes, the engine is placed redundantly above the body frame, so the body height is increased by the overlap between the body frame and the engine. Since the structure had a low center of gravity, the present invention was designed to improve this point.

In order to avoid overlapping the fuselage frame and engine, the fuselage frame was constructed from a ""-shaped power transmission case, and the engine was placed on the right side alongside the "F"-shaped power transmission case.

Additionally, the seat, which was conventionally placed in series with the engine and transmission case, has been placed on the opposite side of the power transmission case.
This balances the weight between the left and right sides and lowers the vehicle height.

In the above layout, the operating levers are arranged on the power transmission case located between the engine and the seat, and the upper ends of the operating levers are configured to be lower than the engine covering part of the vehicle body cover, The structure is such that the operating levers will not get caught even when passing under the lower branches of fruit trees.

Furthermore, in the past, the part of the front axle bracket supporting the front differential case that protruded from the side of the engine could not be removed because the engine was placed on the side. The support part of the front differential case is formed by protruding from the front differential case.

In addition, the gear change case that makes up the power transmission case is divided into a clutch chamber and a gear chamber. One side is equipped with a latch that runs with the PT○ clutch, and the other side is equipped with a reduction gear chain. One side is dry-lubricated and the other is is wet lubrication.

This makes it easy to take out the front PT○ drive shaft.

Furthermore, in order to cool down the heat generated in the friction plates inside the dry clutch chamber, the suction passage of the air cleaner is communicated with the clutch chamber.

(d) Means for Solving the Problems The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be explained.

The power transmission case of the tractor is placed in the center, the engine is placed on one side of the power transmission case, the step and seat are placed on the side opposite to the engine, and the engine cover is raised (high).
Covering the vehicle body cover with a lower step/seat covering part,
The operating levers are placed above the central power transmission case,
The operating levers are configured to be lower than the engine covering portion of the vehicle body cover.

In addition, a front frame is provided that protrudes from the front part of the power transmission case, a front differential case is pivotally supported on the front frame, and a front work equipment mounting device can be attached to the front part of the front frame. The front frame is placed as far back as possible from the front end of the front wheels, and the front frame is attached to the left and right side walls of the power transmission case and protrudes forward.

In addition, a wall section is provided that divides the inside of the transmission clutch case located at the front end of the power transmission case, one side is a clutch chamber that connects and disconnects the engine power, the other side is a gear chamber, and the clutch chamber is dry-lubricated. The gear chamber is lubricated by an oil bath, and the clutch release shaft is arranged vertically within the clutch chamber.

Further, a clutch chamber is formed within a speed change clutch case that constitutes a power transmission case, and the clutch chamber is also used as an air suction passage for an air cleaner.

(E) Embodiment The problems to be solved by the present invention and the means for solving them are as described above.Next, the structure of the embodiment shown in the attached drawings will be explained.

Fig. 1 is an overall side view of the agricultural tractor of the present invention, Fig. 2 is a plan view with safety frames 26 and 27 and canopy 29 removed, Fig. 3 is a rear view, and Fig. 4 is a vehicle body cover. Fig. 5 is a plan view of the rTJ type power transmission case, Fig. 6 is a plan sectional view of the variable speed clutch case A, Fig. 7 is a side sectional view of the variable speed clutch case A,
FIG. 8 is a rear sectional view of the air cleaner 14 and the transmission clutch case A.

As shown in FIG. 5, the agricultural tractor body support member of the present invention includes a transmission clutch case A, a transmission case B, and a rear axle case RC as an "r"-shaped power transmission case. The engine E is attached in a cantilevered manner to the left and right protrusions at the front of the power transmission case. A radiator R is attached to the rear surface of the engine E.

This will be explained with reference to FIGS. 1 and 2.

The aircraft is supported by front wheels 10L/IOR and rear wheels 11L/11R.

In the center of the fuselage, there is a "" mark in Figure 5 that constitutes the fuselage support member.
A shaped power transmission case is arranged.

And the right side from the center of the aircraft is higher, rr
''-shaped power transmission case, engine E, and radiator R are arranged.

A steering handle 28, a seat S, and a hatch leaf below the seat S are arranged on the left side of the aircraft in the direction of travel.

Below the steering handle 28 and the seat S, a vehicle body cover 〇 that covers the battery 7, the "r"-shaped power transmission case, the engine E, and the radiator R is covered.

In the vehicle body cover C, an engine covering part CI that covers the engine E side is higher, and a step/seat covering part C2 that covers the seat S and step part is lower.

Then, the engine covering part C1 and the step/seat covering part C
2, the upper position of the power transmission case is also lowered.

As shown in FIG. 1, these parts include the front and rear PTO clutch levers 71, 71, the main shift lever 32, the front wheel drive thalasso tilt lever 72, the auxiliary shift lever 78, and the hydraulic lift lever 7.
3 are arranged, and the upper ends of these levers are configured to be lower than the upper surface of the engine covering portion C1 so as not to be caught in the fruit tree technique.

A front grill M is provided protrudingly at the tip of the vehicle body cover C.

As shown in Figure 1, the front 3
The point link device connects the top link 35 and the lower link 36.
36, and a lift arm 37 moves the lower links 36 up and down via a lift link 41.

Further, a front PTO shaft 31 is driven by a portion of the speed change clutch case A.

The front three-point link device is constructed between brackets 34 and 340 that protrude left and right.

A rear three-point linkage device is also constructed at the rear of the fuselage. The rear three-point linkage device is composed of a top link 38 and lower links 39, 39, and a lift arm 24.
The lower links 39 and 39 are connected via the lift link 40.
is moving up and down.

A rear PTO shaft protrudes rearward from the rear axle case RC.

A vehicle body frame 9 disposed at the front is disposed under a transmission flank case A that constitutes a 14J type power transmission case, and inclined support columns 21 are provided at the left and right ends of the vehicle body frame 9.
L and 21R are attached, and safety frames 27 and 27 are placed and fixed on the upper ends of the inclined support columns 21L and 21R. Similarly, inclined support columns 22L and
22R is erected, and a safety frame 26 is erected at the upper ends of the inclined support columns 22L and 22R.

In addition, a right side frame 76 and a left step frame 44 are arranged between the front body frame 9 and the rear rear axle housing H-H, and a side frame 76 and a left step frame 44 are arranged to attach a work machine such as a side mower to the side. It consists of

A canopy 29 is placed on top of the four safety frames 26 and 27, forming a safety frame as a whole.

A steering valve 16 is arranged inside a front grille M in front of a steering handle 28. 3
0 is a steering column that supports the steering handle 28.

Further, an air cleaner 14 is arranged in a space above the engine E at the front of the engine E.

The oil pan 6 is a member attached below the engine E, and as shown in FIG. 1, it protrudes below the step frame 44 on which the step portion of the vehicle body cover 0 is placed and supported.

Further, as shown in FIG. 3, the oil pan 6 is arranged to be biased to the right side of the center between the left and right wheels.

Engine E is located on the right side of the "r" shaped power transmission case.
Since the seat S is placed on the left side, the operator is placed on the seat S, and the battery 7 is placed under the seat S to maintain balance between the left and right sides.

The state in which the vehicle body cover 〇 is removed will be explained in Fig. 4.

A front wheel drive shaft 17 projects forward from the rear axle case RC, and transmits power to the front differential case FD. Rear PTO is located behind the transmission clutch case A.
A drive shaft 43 extends to the rear PTO shaft 23.

Further, a radiator R is arranged at the rear of the engine E, and a radiator fan F is arranged at the front of the radiator R. In addition, a dust removal net M1 is installed at the rear of the radiator R.
2 is placed.

The step frame 44 is disposed in the front and rear between the support frame 42 that protrudes laterally from the rear axle case RC and the vehicle body frame 9.

Furthermore, front frames 18 and 19 protrude forward from the left and right sides of the transmission thalassochi case A.

Since the transmission clutch case A is offset to the left from the center of the aircraft, the left front frame 19 protrudes straight forward, but the right front frame 18 is bent in the middle. has been done. A front weight locking body 13 is fixedly provided in front of the front frames 18 and 19.

Brackets 3 are installed on the left and right sides of the front frames 18 and 19.
4.34 is attached and a front three-point link device is attached.

Next, referring to FIGS. 6 and 7, the internal structure of the speed change clutch case A will be explained.

A clutch housing is configured on the left side of the transmission clutch case A, and an independent flanch mechanism is arranged inside. That is, the running latch 50 and the PTO
The clutch 49 is configured to be separately operable.

Both clutches 49 and 50 are operated by double depressing the clutch pedal provided on the vehicle body frame 9 via a link 65 to a thalasso-tire release shaft 45 which is vertically supported inside the transmission clutch case A. By rotating back and forth, the thalassochi shifter is rotated and operated.

The running latch 50 connects and disconnects the rotation of the latch shaft 48 along which the cylinder shaft runs, and the rotation of the running latch shaft 48 is transmitted to the gear 54 . The gear 54 is transmitted to the cylindrical shaft 53 via a gear 56 on the shaft 46, a gear 58 on the shaft 51, a gear 59 on the shaft 52, and a gear 66 on the shaft 75 in FIG. Power is transmitted into the mission case B by the cylindrical shaft 53, and the traveling speed is changed inside the mission case B.

Next, the rotation connected and disconnected by the PTO clutch 49
O clutch shaft 4 on shaft 7, through gear 55, from gear 57 on shaft 46, through gear 63 on shaft 51, through gear 74 on shaft 52, on rear PTO drive shaft 43 It is transmitted to the loose fit gear 61. By operating the clutch engaging body 62 on the rear PT○ drive shaft 43, power to the rear PT○ drive shaft 43 is connected or disconnected.

The rear PTO drive shaft 43 transmits power to the rear PTO shaft 23 as shown in FIG.

The loosely fitted gear 61 also meshes with the loosely fitted gear 63 on the front PTO drive shaft 77, and the clutch engaging body 64 on the front PTO drive shaft 77 allows the front PTO
The power of the O drive shaft 77 is disconnected. The front PTO drive shaft 77 transmits power to the front PTO shaft 31 shown in FIG.

As shown in FIG. 8, since the vehicle body frame 9 is disposed below the transmission clutch case A, suction ports 9C and 9d are opened at different positions on the vehicle body frame 9. The air is drawn into the clutch chamber A2 through the lower open lower part 9 of the transmission clutch case A, and then into the air cleaner 14 through the upper suction port 14a, thereby supplying air to the engine.

(F) Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

According to claim 11, a power transmission case of a tractor is arranged in the center, an engine is arranged on one side of the power transmission case, a step and a seat are arranged on the side opposite to the engine, and the engine covering part is raised high. The vehicle body cover has a lower step/seat covering portion, the operating levers are placed above the central power transmission case, and the operating levers are lower than the engine covering portion of the vehicle body cover. Therefore, the engine E, power transmission case, and seat S could be arranged without overlapping vertically, making it possible to configure the vehicle with a low vehicle height.

Furthermore, on the right side of the vehicle body cover C, which is wide from side to side, there is an engine covering part C1 that protrudes upward, and on the left side there is a low step/seat covering part C2, and in the center part there is a low power transmission case part. This is the cover, and in this part are the front and rear PTO clutch levers 71, 71, the front wheel drive clutch lever 72, and the hydraulic lift lever 73.
By arranging the operating levers such as the auxiliary shift lever 78, the upper ends of the operating levers do not protrude from the engine covering portion C1, so that they do not get caught on the branches of low fruit trees.

According to claim (2), a front frame is provided that protrudes from the front part of the power transmission case, a front differential case is pivotally supported on the front frame, and a front work equipment mounting device can be attached to the front part of the front frame. The front end of the front frame is placed as far back as possible from the front end of the front wheels, and the front frame is attached to the left and right side walls of the power transmission case and protrudes forward, so that the front frame 18 attached to the front end of the power transmission case is Front differential case FD by 19
Since the front differential case is supported at the front of the engine, the longitudinal length of the fuselage can be shortened compared to the conventional case where the front differential case is supported at the front of the engine.

Also, from the front end of the power transmission case, the front PTO drive shaft 7
7 protrudes, it is possible to easily transmit power to the front work machine mounting device.

Also, since the engine E was not placed in front of the operator, forward visibility was improved.

Furthermore, since the turning angle of the front wheels supported by the front differential case FD can be increased, the steering angle can be increased and sharp turns can be made.

As claimed in claim (3), a wall portion A1 is provided to partially define the inside of the transmission clutch case disposed at the front end of the power transmission case, one side serving as a clutch chamber for connecting and disconnecting engine power, the other side serving as a gear chamber, and the clutch chamber is Dry lubrication is used, the gear chamber is lubricated by an oil bath, and the clutch release shaft is placed vertically inside the clutch chamber, so the inside of clutch chamber A2 is dry, increasing the frictional force of the friction plates and making the clutch smaller. It was possible to do that.

By arranging the clutch release shaft 45 vertically, the clutch release shaft 45 does not take up space in the clutch chamber A2, so that the clutch chamber A2 can be configured to be compact.

As claimed in claim (4), the clutch chamber is formed within the speed change clutch case that constitutes the power transmission case, and the clutch chamber is also used as the air suction passage of the air cleaner, so that the frictional heat generated in the clutch chamber A2 is Air cleaner 14
This makes it possible to cool the room using cooling air drawn into the tank.

Furthermore, the clutch chamber A2 makes it possible to dust-proof the cooling air drawn into the air cleaner 14.

[Brief explanation of drawings]

Fig. 1 is an overall side view of the agricultural tractor of the present invention, Fig. 2 is a plan view with safety frames 26 and 27 and canopy 29 removed, Fig. 3 is a rear view, and Fig. 4 is a vehicle body cover C. 5 is a plan view of the "r"-shaped power transmission case, FIG. 6 is a plan sectional view of the transmission flange case A, and FIG. 7 is a side sectional view of the transmission clutch case A.
FIG. 8 is a rear sectional view of the air cleaner 14 and the transmission clutch case A. A... Speed clutch case A1... Wall part A2... Clutch chamber A3... Gear room B... Mission case C... Body cover CI... Engine covering part C2...・Step・Seat cover E・・・・Engine FD・Front differential case R・・Radiator RC・14・18゜32・45・71・72・73・78・・Rear axle case・Air cleaner 9・・・Front frame・Main gear shift lever・Clutch release shaft・PTO clutch lever・Front wheel drive clutch lever・Hydraulic lift lever・Auxiliary gear shift lever Applicant Yanmar Diesel Co., Ltd. Agent Patent attorney Hisashi Yano Part

Claims (4)

[Claims] (1) The power transmission case of the tractor is placed in the center, the engine is placed on one side of the power transmission case, the step and seat are placed on the side opposite to the engine, the engine cover is raised, and the step - Features include a vehicle body cover with a lower seat covering section, operating levers placed above the central power transmission case, and the operating levers being lower than the engine covering section of the vehicle body cover. Agricultural tractor. (2) In the agricultural tractor according to claim (1), a front frame protruding from the front part of the power transmission case is provided, a front differential case is pivotally supported on the front frame, and the front differential case is mounted on the front part of the front frame. An agricultural tractor capable of attaching a machine mounting device, the front end of the front frame being located as far back as possible from the front end of the front wheels, and the front frame being attached to the left and right side walls of a power transmission case and protruding forward. . (3) In the agricultural tractor according to claim (1), there is provided a wall portion that divides the inside of the transmission clutch case disposed at the front end of the power transmission case into two parts, one of which serves as a clutch chamber for connecting and disconnecting the power of the engine, and the other serving as a gear chamber. An agricultural tractor characterized in that the clutch chamber is dry-lubricated, the gear chamber is lubricated by an oil bath, and the clutch release shaft is vertically arranged in the clutch chamber. (4) The agricultural tractor according to claim (1), characterized in that a clutch chamber is formed within the variable speed clutch case constituting the power transmission case, and the clutch chamber is also used as an air suction passage of an air cleaner. tractor.