JP2746458B2 - Low center of gravity tractor - Google Patents

Description

The present invention relates to a low center of gravity tractor used for special applications such as sloping terrain.

(B) Prior art As for a low center of gravity tractor mainly for work on a slope, a technique as described in JP-A-59-169402 has been conventionally known.

(C) Problems to be solved by the invention In a conventional low center of gravity tractor for sloping terrain, the engine was arranged overlapping above the fuselage frame.
The height of the fuselage was increased by the overlap between the fuselage frame and the engine, and the structure was designed to be opposed to the low center of gravity.

 The present invention is designed to improve this point.

That is, in order to avoid the overlap between the body frame and the engine, the body frame is constituted by a "Γ" -shaped power transmission case, and the engines are arranged side by side with the "Γ" -shaped power transmission case.

In addition, the battery, which was conventionally placed inside the hood, is placed under the seat on the opposite side of the engine to balance the left and right weights.

In addition, by arranging the engine side by side with the "Γ" type power transmission case, the oil pan arranged below the engine is arranged more deviated than the center position between the left and right wheels. is there.

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

In claim (1), the transmission clutch case A, the connection support case B, and the rear axle case PC are sequentially connected in order from the front to form a power transmission case of the tractor, and the transmission clutch case A is located on the right side at the front end. Protruding into
A power transmission case of a tractor having a Γ shape in plan view when the tractor travels upward, and an engine E is attached to a rear surface of a portion where the transmission clutch case A protrudes rightward to be cantilevered, The side opposite to the side where the engine E is attached,
A seat S is arranged on the left side of the power transmission case, a battery is arranged below the seat S, and an engine E arranged on the right side and a connection provided at a central position are connected to an engine E arranged on the right side when the body direction of the tractor is viewed upward. Support case B and rear axle case RC,
The seat S and the battery 7 arranged vertically on the left side are arranged in parallel with each other.

According to claim (2), in the low center of gravity tractor according to claim (1), an oil pan is protruded from a lower surface of the engine E, and the oil pan is arranged so as to be deviated from a center position between the left and right wheels. Things.

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

FIG. 1 is an overall side view of a low center of gravity tractor of the present invention, FIG.
FIG. 3 is a plan view showing the state in which the safety frames 26 and 27 and the canopy 29 have been removed, FIG. 3 is a rear view thereof, and FIG.
5, FIG. 5 is a plan view of a power transmission case of a "Γ" shape, FIG. 6 is a plan sectional view of the transmission clutch case A, and FIG. 7 is a side sectional view of the transmission clutch case A. is there.

As shown in FIG. 5, the low-center-of-gravity tractor body support member of the present invention comprises a transmission clutch case A, a connection support case B, and a rear axle case RC as a power transmission case having a “Γ” shape. The engine E is attached to the left and right protruding portions of the front portion of the power transmission case in a cantilever state. A radiator R is attached to the rear surface of the engine E.

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

The fuselage is supported by front wheels 10L and 10R and rear wheels 11L and 11R. In the center of the fuselage, a power transmission case of the “Γ” shape shown in FIG.

And the right side is higher from the center of the aircraft,
"Γ" type power transmission case, engine E and radiator R
Is arranged.

A steering handle 28, a seat S, and a battery 7 below the seat S are arranged in a left portion of the body in the traveling direction.

Then, below the steering wheel 28 and the seat S,
A battery 7, a power transmission case of a “Γ” shape, an engine E, and a vehicle body cover C that covers the radiator R are covered. A front grill M is protrudingly provided at the tip end of the vehicle body cover C.

As shown in FIG. 1, a front three-point link device is provided at the front of the body with a top link 35 and lower links 36,3.
The lower link 36, 36 is moved up and down by a lift arm 37 via a lift link 41.

It is also possible to provide a front PTO shaft 31,
Power is transmitted to the front PTO shaft 31 from the transmission clutch case A via the front PTO drive shaft 77 in FIG.

The front three-point link device is configured between brackets 34, 34 projecting left and right.

In addition, a rear three-point link device is configured behind the fuselage. The rear three-point link device is composed of a top link 38 and lower links 39, 39.
4, the lower links 39, 39 are vertically rotated via the lift link 40.

The rear PTO shaft 23 projects rearward from the rear axle case RC.

A body frame 9 disposed at the front is disposed below a speed change clutch case A constituting a power transmission case having a “Γ” shape.
21R is attached, and safety frames 27, 27 are placed and fixed on the upper ends of the inclined support columns 21L, 21R.

Similarly, the portions of the rear axle housings H, H projecting right and left from the rear axle case RC are provided with inclined support columns 22L, 22R.
The safety frame 2 is set up on the upper ends of the inclined support columns 22L and 22R.
6 are standing.

Further, a right side frame 76 and a left step frame 44 are disposed between the front body frame 9 and the rear rear axle housing H, H, and a work machine such as a side mower is mounted on the side. Unit.

A canopy 29 is disposed on the four safety frames 26 and 27 to form a safety frame as a whole.

The steering hydraulic valve 16 is arranged inside the front grille M in front of the steering handle 28. Reference numeral 30 denotes a steering column that supports the steering handle 28.

Also, an air cleaner is installed in the upper space in front of the engine E.
14 are located. 32 is a speed change lever. The oil pan 6 is a member attached below the engine E,
As shown in the figure, it protrudes below the step frame 44 for placing and supporting the step portion of the vehicle body cover C.

Further, as shown in FIG. 3, the oil pan 6 is disposed so as to be deviated to the right from the center between the left and right wheels.

Then, since the engine E is arranged on the right side of the power transmission case of the "Γ" shape, a seat S is provided on the left side, and an operator is placed, and the battery 7 is placed under the seat S. Is balanced.

In FIG. 4, a state in which the vehicle body cover C is removed will be described.

The front wheel drive shaft 17 projects forward from the rear axle case RC, and transmits power to the front differential case FD. Rear PTO drive shaft 4 behind the transmission clutch case A
3 extends to the rear PTO shaft 23.

A radiator R is disposed at the rear of the engine E, and a radiator fan F is disposed at the front of the radiator R.
Is arranged. At the rear of the radiator R, a dust net basket 12 is arranged.

The step frame 44 is disposed before and after between the support frame 42 and the vehicle body frame 9 projecting sideways from the rear axle case RC.

Front cases 18 and 19 project forward from the left and right sides of shift clutch case A, respectively.

Since the shift clutch case A is deviated to the left from the center of the body, the left front frame 19
Although it is projected straight forward, the right front frame 18 is bent in the middle. At the front of the front frames 18 and 19,
Is fixed.

On the left and right sides of the front frames 18, 19, brackets 34,
34 is attached to the front three-point link device.

Next, the internal structure of the transmission clutch case A will be described with reference to FIGS.

A clutch housing is formed on the left side of the transmission clutch case A, and an independent clutch mechanism is disposed inside.

That is, the traveling clutch 50 and the PTO clutch 49 are configured to be separately operable.

The clutches 49 and 50 are operated by a double-depression of a clutch pedal provided on the vehicle body frame 9 and a clutch arm shaft vertically pivotally supported inside the transmission clutch case A via a link 65. By rotating 45 forward and backward, the clutch shifter is configured to rotate and operate.

The rotation of the traveling clutch shaft 48 of the cylindrical shaft is disconnected and connected by the traveling clutch 50, and the rotation of the traveling clutch shaft 48 is
Is transmitted to The gear 54 is transmitted to the cylinder shaft 53 via the gear 56 on the shaft 46, the gear 58 on the shaft 51 and the gear 59 on the shaft 52, and the gear 66 on the shaft 75 in FIG.

Power is transmitted into the connection support case B by the cylindrical shaft 53, and the traveling speed is changed inside the connection support case B and the rear axle case RC.

Next, the rotation connected and disconnected by the PTO clutch 49 is transmitted from the PTO clutch shaft 47 via the gear 55, the gear 57 on the shaft A6, the gear 74 on the shaft 51 via the gear 63 on the shaft 51, and the gear 74 on the shaft 52. Is transmitted to the loose fitting gear 61 on the rear PTO drive shaft 43 via the By operating the clutch engaging body 62 on the rear PTO drive shaft 43, the power to the rear PTO drive shaft 43 is disconnected and connected.

Power is transmitted to the rear PTO shaft 23 in FIG. 1 by the rear PTO drive shaft 43.

The loose fitting gear 61 also meshes with the loose fitting gear 63 on the front PTO drive shaft 77, and the power of the front PTO drive shaft 77 is cut off by the clutch engagement body 64 on the front PTO drive shaft 77. Touched. Power is transmitted to the front PTO shaft 31 in FIG. 1 by the front PTO drive shaft 77.

(F) Effects of the Invention The present invention is configured as described above, and has the following effects.

The transmission clutch case A, the connection support case B, and the rear axle case RC are sequentially connected from the front to form a tractor power transmission case, and the transmission clutch case A is located at the front end on the right side. The transmission E is attached to the rear surface of the portion where the transmission clutch case A protrudes to the right, and the engine E is attached. The seat S is disposed on the left side of the power transmission case opposite to the side on which the engine E is attached, and the battery is disposed below the seat S. Since the engine E disposed on the right side, the connecting support case B and the rear axle case RC connected at the center position, and the seat S and the battery 7 disposed on the left and right are arranged in parallel, It is not necessary to use a gin E as part of the airframe support member, in which it is possible to reduce the weight of the entire body frame.

Further, since the body frame and the engine E do not vertically overlap as in the conventional case, the engine E is also viewed in a plan view “Γ”.
Since the tractor can be arranged at a lower position of the letter-shaped power transmission case, the tractor has a lower center of gravity as a whole.

In addition, a seat is arranged on the side opposite to the engine attached side of the "Γ" type power transmission case, and the battery is arranged below the seat, so that the right side of the "Γ" type power transmission case is The weight of the arranged engine E and the weight to be balanced can be obtained by the weight of the operator on the seat S and the weight of the battery 7, so that the right and left weight can be balanced.

Further, since the battery 7 is arranged at a low position, the center of gravity as a whole can be reduced.

Since the oil pan 6 protruding downward from the engine attached to the power transmission case of the "Γ" shape is deviated to the center position between the left and right wheels as in claim (2), the conventional tractor In this case, the capacity can be made larger than in the case of the oil pan, and a sufficient amount of lubricating oil can be secured even when the body is inclined.

Further, since there is no need to provide a convex portion at the center position of the fuselage, it is possible to avoid a projecting object protruding from the field scene even though the tractor has a low center of gravity.

[Brief description of the drawings]

1 is an overall side view of the low center of gravity tractor of the present invention, FIG. 2 is a plan view of the same with the safety frames 26 and 27 and a canopy 29 removed, FIG. 3 is also a rear view, and FIG. FIG. 5 is a plan view of a power transmission case having a “Γ” shape, FIG. 6 is a cross-sectional plan view of a transmission clutch case A, and FIG. FIG. A: Variable speed clutch case B: Connection support case C: Body cover FD: Front differential case R: Radiator RC: Rear axle case F: Radiator fan M: Front grille 6: Oil pan 7: Battery 9 ... body frame

Claims (2)

(57) [Claims] 1. A transmission clutch case A and a connection support case B
And a rear axle case RC are connected in order from the front to form a power transmission case of the tractor, and the transmission clutch case A is projected rightward at the front end, and the traveling direction of the tractor is viewed upward, as viewed in plan. A power transmission case of a Γ-shaped tractor is provided. An engine E is attached to a rear surface of a portion where the transmission clutch case A protrudes to the right side to be cantilevered, and the power is opposite to the side on which the engine E is attached. A seat S is disposed on the left side of the transmission case, a battery is disposed below the seat S, and an engine E disposed on the right side, with the tractor's body traveling direction facing upward, and a connecting support provided at a central position. A low center-of-gravity tractor, comprising a case B, a rear axle case RC, a seat S and a battery 7 arranged vertically on the left side, and three in parallel. 2. A low center of gravity tractor according to claim 1, wherein an oil pan projects from a lower surface of the engine E, and the oil pan is disposed so as to be deviated from a center position between the left and right wheels. And a low center of gravity tractor.