JPS608167A - Tractor - Google Patents

Abstract

PURPOSE:To simplify the getting-off and -off of the driver's seat of a tractor, and as well to enhance the comfortability of the driver's seat, by arranging a driver's step above transmission shafts. CONSTITUTION:Transmission shafts 12, 13 are positioned below an engine crankshaft 2a, and as well a driver's step 17 is laid above these transmission shafts 12, 23. Accordingly, the driver may get on and off the driver's seat 16 without striding over a clutch housing which projects from the center of the driver's seat, thereby the getting-on and -off becomes easy. Further, the top surface of the driver's step is made substantially flat over the cross-width of the frame, and therefore, the comfortability of the driver's seat is satisfactory, thereby less fatigue is experienced during long drive.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the construction of tractors, particularly small and medium-sized tractors.

Conventionally, small and medium-sized tractors 1 have been of an integral type, as shown in FIG. 1, in which an engine block 2, a clutch housing 3, and a transmission case 5 are combined to form a tractor frame. . That is, the engine block 2 supported together with the front chassis 9 by the front wheels 7 is arranged at the front of the tractor 1, and the transmission case 5 supported by the rear wheels 10 is arranged at the rear of the tractor 1. These engine block 2 and transmission case 5 are connected and fixed by a clutch housing 3. Further, within the clutch housing 3, the crankshaft 2a of the engine 2 is connected to a clutch 11, and further via a transmission shaft 12 to a transmission gear train 13 within the Mitsushirin case 5.
On the other hand, a driver's seat 16 consisting of a seat 15 and the like is arranged above the clutch housing 3 and transmission case 5. Therefore, the clutch housing 3, which accommodates the transmission sleeve 12 that is aligned with the engine crankshaft +-2n and has a relatively long length, is located considerably above the driver's seat 16. As shown in FIG. 2, steps 17 that protrude greatly and are placed on both sides of the clutch housing 3 for the driver to rest his or her feet on are arranged separately.

Therefore, when getting on and off the driver's seat 16, the driver has to step over the large protruding clutch housing 3, which is very troublesome, and especially in recent years, tractor work is often done by women and girls. However, women and girls with small bodies were forced to perform difficult tasks. In addition, the driver has to drive step 1, which is narrow and divided into left and right.
The driver had to put his feet on the 7, which meant that his posture was fixed, and the strain of driving for long periods of time caused fatigue.

The object of the present invention is to provide a tractor in which a driving step is disposed on the machine body, and the two sides of the driving step are grooved substantially flush across the width of the machine body, thereby eliminating the above-mentioned drawbacks. .

The present invention will now be described in detail with reference to FIGS. 3 and 4.

Similarly to the conventional example, the tractor 20 of this embodiment has an integral structure in which each gauge is connected to form a frame. That is, the engine block 2 supported together with the front chassis 9 by the front wheels 7 is arranged at the front of the 1-sector 2o, and the rear transmission case 21 supported by the rear wheels 10 is arranged at the rear of the tractor. These engine block 2 and rear transmission case 21 are connected and fixed by a front transmission case 22. The front transmission case 22 is made of an integral structure or a split structure, and the front part 22n houses the clutch 11 and the transmission gear train 13, and the rear part 22b houses the main transmission shaft 12 and the PTO''.
A transmission shaft 23 is housed therein.

Therefore, only a small storage space is required at the rear, and the shape is odd, with a small width and height, and a constricted top surface. In addition, the front part 22a of the front transmission case
A gear shift lever 19 extends from the seat toward the driver's seat 16, and a driving step 17 is fixed to the upper surface of the case rear portion 22b, as shown in FIG. and,
The upper surface of the operating step 17 is configured to be substantially flush across the width of the machine body. Note that the rear transmission case 21 houses an actuating device 24, a reduction gear 25, and a speed gear 27 for the two PTO shafts and the circumference 6.

Therefore, according to the present tractor 20, the rotation of the crankshaft 2a of the engine 2 is transmitted to the transmission gear train 13 through the clutch 11 within the front transmission case 22, and the rotation is shifted to a predetermined speed by the transmission lever 19. Through the main transmission shaft 12, ff1 part i: cushion case 2
The signal is transmitted to the actuating device 24 in the tractor 2o, and is further transmitted to the left and right rear wheels 10 via the reduction gear 25, thereby causing the tractor 2o to travel.

On the other hand, the PTO transmission shaft 23, which is being rotated via the gear train 13, is shifted to a predetermined speed by the speed change gear 27 in the rear transmission case 21, and reaches 6 points on the two PTO shafts.

As explained above, according to the present invention, since the engine transfer step 17 is provided, the driver can get on and off the driver's seat 16 without stepping over the clutch housing 3 protruding from the center of the driver's seat, unlike in the conventional case. This makes getting on and off much easier. In addition, since the upper surface of the operating step 17 is configured to be substantially flush across the width of the fuselage, it provides good comfort and reduces fatigue even during long hours of operation.

[Brief explanation of drawings]

Figure 1 is a side view showing a conventional trunk, Figure 2 is a side view of a conventional trunk.
3 is a side view showing a tractor according to the present invention, and FIG. 4 is a sectional view taken along line IV-IV. 2. Engine block, 2a. Crankshaft
, 12... (main) transmission shaft , 17-operation step
, 17a top surface, 20...tractor, 23...
PTO) Transmission shaft Applicant: Mitsubishi Agricultural Machinery Co., Ltd. Figure 2 Figure 3 Figure 3/-0 Figure 4 July 1b, 1980 Commissioner of the Patent Office Manabu Shiga 1 Case Indication 1988 Patent ¥1- Application No. 19585 2 Name of the invention Tractor 3 Person making the amendment 'I', (Relationship with T-) Wait 8'1: Applicant Address 667 Jlj, Izumo-cho, Oaza, Izumo-cho, Hetsuka-gun, Shimane Prefecture (1 Name (Name) ) (:ra7) Mitsubishi Agricultural Machinery Co., Ltd. Representative Inoue Sambei 4th generation Jlj person

Claims (1)

[Claims] 1. A tractor characterized in that a rotating step is provided, and the upper surface of the driving step is substantially flush across the width of the machine body.