JPS5884244A - Transmission for agricultural tractor - Google Patents

Abstract

PURPOSE:To enable an operating person to sit in a low position with both his legs in contact with each other, by dividing motive power to two directions at a lower transmission side from a common input shaft to use one divided portion mainly for a moving transmission and the other mainly for a PTO transmission. CONSTITUTION:Motive power from a common input shaft 18 is divided to two directions at a lower transmission side. A plurality of shafts are arranged in the form of an inverted U as seen from the front. One divided power portion is applied to a moving transmission 19-22 and the other is applied to a PTO transmission 53-66. For these reasons, the transmissions can be constructed in a case A short in the front-to-rear direction and the case can be placed forth by the length of a clutch housing. A moving output shaft and a PTO output shaft 56 are protruded to the lowermost positions under the position of the clutch housing to transmit motive power to a rear axle case. As a result, the operator's seat can be located in a low position and the operator can step through in front of the seat without bestriding.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a tractor with a stable driver's seat by lowering the vehicle height of an agricultural tractor, particularly by lowering the seat and the staple portion.

Conventional agricultural tractors have a main frame that connects the engine, clutch housing, transmission case, and rear axle case, and the front wheels do not touch the engine when rotating for steering. If the engine is placed in this way, the engine will inevitably be placed high, so the clutch housing, transmission case, and rear axle case that are fixed to the rear of the engine must also be placed higher than the ground, and the seats will also be unstable compared to passenger cars. It was located in a very high position, and since there was a transmission case just below the seat, it was a riding-style driver's seat that was straddled over the transmission case. In this case, we have improved this and created a set of stepsle where the person sits with both feet side by side and in a low position.

In order to create a stable agricultural tractor with such a step-through set, the present invention particularly shortens the transmission case in the front and rear direction in order to put it in front of the step (128), makes the transmission case vertically long, and also incorporates a traveling transmission system. , P.T.
In order to accommodate the O transmission system in this vertically elongated transmission case with a short longitudinal length, two transmission systems separated from the input shaft are arranged side by side on the left and right, one being mainly used as a traveling transmission system and the other mainly as a PTO transmission system. In both cases, the lowest shaft at the lower end serves as the travel output shaft and the PTO output shaft, and power is transmitted to the rear axle case via a connecting shaft, resulting in an agricultural tractor with a low seating position and a step-through set.

The object of the present invention is as described above, and the structure will be explained in detail based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is an overall side view of the tractor for main immersion.

An engine (2) is placed inside the bonnet (1), and a radiator u3 is placed in front of the engine (2). A front axle bracket (3) is fixedly installed on both sides of the lower part of the engine (2).
) supports the power steering device (113), the front wheel drive device (5), and the transmission case (A). Install the main frame (+4) e ld on different levels above and below the transmission case (A), and attach the main frame (4)
), the transmission case (A) and rear axle case (
B) are installed in parallel.

The crankshaft protrudes toward the rear of the engine (2), causing the flywheel (9) to protrude and rotate. , power is transmitted from the flywheel +9+ to the mission case (A) via an elastic coupling dω. A cabin (8) is provided using the bonnet (1) and fender (114) as supporting parts, and the skylight (111) and rear window (112) of the cabin (8) are installed.
is configured so that it can be opened. 111 is a steering wheel.

Figure 2 is the power transmission diagram of the travel drive system, Figure 3 is the FT'O
A power transmission diagram of the part where the drive and travel drive system are mixed, Figure 4 is a longitudinal cross-sectional view of the travel drive system of the mission case (A), and Figure 5 is a longitudinal cross-section of the part where the PT6 drive and travel drive system are mixed. Figure 6 shows the vertical direction of the rear axle case (B).
7 is a front view of the oil passage plate (107) fixed to the front of the mission case (A), FIG. 8 is a drawing showing the arrangement of the shafts in the mission case (A), and FIG. The figure shows the oil road plate (
Figure 10 is a vertical cross-sectional view of the PTO switching case (7).
), Figure 11 shows the front view of the Freon) PTO extraction case (
110,) is a front view.

Inside the mission case (A) is the human power axis u shown in Figure 8.
Branches from gJ in two directions, from the input axis to the axis ag11 [
], a traveling drive system in which variable speeds are transmitted to shaft (2) and shaft rotation, and variable speeds are transmitted from input shaft u81 to shaft (■), reverse rotation shaft (to), shaft (goods), shaft haze, and shaft ω. There are two drive systems (PTO, a mixture of a dynamic system and a travel drive system).

First, the PT○ drive system will be explained with reference to FIG.

As shown in Figure 4, the flywheel (9) of the engine (2)
The rotation that is constantly transmitted through the elastic body coupling Uω is transmitted to the human power axis U (to) of the mission case (A) via the cuff 6) and the constant velocity join) C1η.

Returning to Fig. 5, the wide gear aΦ on the input shaft
from the fixed embroidery wheel on the horizontal axis l53) to the loose-fit gear on the axis a (
651, and the power is transmitted to the loose fit gear 165) and the loose fit gear 165) on the shaft (to). Hydraulic clutch device for PTO transmission (when 721 is connected or disconnected, the shaft (to) rotates and the fixed gear (731t741 (!: PTO output shaft (to) The engagement is selected using the slider surface, and the PTO output shaft blade shaft is shifted to two stages: high and low.

This rotation of the PTO output shaft extracts power independently of the traveling speed change, and is an independent PTO rotation that rotates even when the aircraft is stopped. PTO box (110)
). 2) is a Freon) PTO shaft, 2 is a loose fit shaft, and @t80) is a fixed gear.

The rotation of the PTO output shaft (to) is controlled by connecting the constant velocity joint (571) from the P'l'O connecting shaft (571) to the PT○ switching case (7) in Fig. 6 using the constant velocity joint (121) provided at the rear end. )
It can be conveyed by tJ'i.

Inside the PTO switching case (7), the traveling connecting shaft ■ transmits power to the shaft through the constant velocity joint (120), and the general gear punishment of @Tado and the plaything on the shaft (goods). The gears are always in mesh. Independent P in Mission Case (A)
When the TO rotary transmission is in a neutral state and no rotation is being transmitted to the PTO output shaft, operate the switching lever (108) shown in Fig. 10, which is equipped with a double engagement prevention device, and use the switching shifter (109) to switch the slider ) is meshed with the internal gear of gear (3), the PTO rotation of the traveling system that changes in relation to the traveling speed can be obtained. The rotation of the shaft (goods) is transmitted to the shaft through the coupling, and the shaft and pTo@(8
9), the final deceleration takes place. It is transmitted from the fixed gear on the shaft ■ to the double loose fit gear on the PTO shaft (89),
931 and two loose fitting gears on the shaft! 11m is always engaged,
Gear (g) Rotates the fixed gear on the PTO shaft and drives the PTO shaft. Also, PTOII [B (901
When the front PTO shaft of the front PTO box (110) is driven by the PTO rotation of the traveling system, the front PTO shaft of the front PTO box (110) is also driven by the PTO rotation of the traveling system.

The PTO hydraulic clutch device (■) guides the pressure oil generated by the hydraulic pump 69) on the rear end of the shaft to the seal case 161) through the hydraulic control valve, and The through oil passage leads to the PTO hydraulic clutch device @. The seal case (61) is also integrally configured with an inertial slip prevention brake device that prevents rotation slip of the PTO shaft. When the traveling system PTOf speed is set at the changeover lever, a double engagement prevention device is installed in the shift lever so that the slider on the axis ω in FIG. 5 is always in the neutral position.

Next, let's explain the driving shift from the main shift from low to high.

Reverse speed is determined by rotating the input shaft (previously fixed gear (2)) in Figure 5, rotating the fixed gear (2) on the shaft, and rotating the general gear (641 on the shaft (2)). It meshes with the reversing gear (goods).

Next, since it meshes with the loose fitting wheel C7α on the shaft,
By connecting and disconnecting the reverse hydraulic clutch device 1691, the power is transmitted from the shaft to the fixed gear. The fixed gear on the shaft (2) meshes with the gear train of the traveling system shown in FIG. 4, and transmits reverse rotation to the fixed gear on the shaft (2).

Next, the main gear 1st speed is interlocked with the input shaft -, fixed gear @, fixed gear @, shaft ■, fixed gear -, and loose gear 6m in Fig. 5.
Hydraulic clutch device for main transmission first transmission -
goods). The force is then transmitted from the fixed gear to the fixed gear shown in FIG. 4, rotating the shaft R1) in the forward direction.

' In Fig. 4, the main gear 2nd speed is input shaft -, fixed gear (to), fixed gear ■, shaft a9, fixed gear ■, loose gear (
When the hydraulic clutch device (to) for the second main gear shift is engaged and disconnected from (to), the rotation of the forward second gear from shaft (■) to the general gear (to) on shaft (21) via the fixed gear (support). convey.

Unlike the second speed, the third forward speed is fixed, the gears are fixed, and the rotation of the loosely fitted wheel is controlled by the third forward hydraulic clutch/device.
to the axis □□□.

In the fourth forward speed, the rotation of the fixed gear (to) and the loosely fitted wheel clυ is transmitted to the shaft (4) by the fourth forward hydraulic clutch device. Hydraulic clutch devices for traveling speeds +691 +68) +341 +331 ml on the shaft - and shaft a9 are supplied with pressure oil generated by the hydraulic pump □□□ on the shaft through the oil pressure control valve in the seal case +601 ) is used to supply and control oil.

Next, the traveling sub-transmission device will be explained.

In FIG. 4, the auxiliary gear is shifted to 4th speed between the shaft 121+ and the travel output shaft @.

The 1st speed sub-shift consists of the general gear on the shaft (21) and the two loosely fitted gears on the output shaft (21) ((47) of 4η meshes, and the other (7) +45) is connected to the shaft again. It meshes with the double loose fit gear C19)+401(7)1401 on C1).

The other 13 (support) meshes with the loosely fitted gear (4) on the travel output shaft @, and the slider ω meshes with the internal gear (44a) to become the auxiliary gear 1st speed. is used for extremely low-speed tasks such as trencher work and onion pouring.

The second auxiliary speed is obtained by meshing the general gear (to) on the shaft +21) with the loose fit gear (43) on the travel output shaft, and meshing with the internal gear (43a) of the slider.

The third sub-shift speed is obtained by selecting the engagement between the fixed gear 142 and the loose-fit gear (0), and the fourth sub-shift gear is selected by the slider (491) between the general gear (to) and the loose-fit gear (411).

A double mesh prevention device is interposed between the slider (491 and ω) to prevent them from meshing at the same time.

The driving gears are the main gear and the auxiliary gear, with 4 reverse gears and 1 forward gear.
It has a total of 20 speeds, 6 speeds.

The front end of the traveling output shaft @ is transmitted to the front wheel drive shaft through the front wheel drive clutch (51), and the front end of the traveling output shaft @ is transmitted to the front wheel drive shaft t (
51.

(The rear end of the traveling output shaft is a constant velocity joint) (The rear end of the traveling output shaft is a constant velocity joint) (As shown in Fig. 6, a constant velocity joint (1
20) again and is connected to the shaft of the PTO switching case (7).

Pinion shafts (100) are arranged in parallel at the top of the shaft end,
Deceleration takes place between the fixed gears - and (to). The pinion shaft (100) is decelerated in the final deceleration case (to) via the differential device (C) to drive the rear wheels uatta.

As shown in FIG. 6, a hydraulic cylinder (101) is provided vertically in parallel to the rear wall of the rear axle case CB, and a piston (122), a connecting rod (102)
, rotates a lift arm protruding from the hydraulic case (104) via the arm (103).

As shown in FIG. 7, a pump Uα of a hydraulic system for a working machine is provided protruding from the upper surface of the transmission case (A), and is driven by a bell (106).

As described above, this agricultural tractor does not have a so-called clutch housing, and therefore does not have a main clutch device, and engages and disconnects the clutch using a hydraulic clutch device of the traveling transmission system and PTO transmission system. The transmission case (A) is moved to the position of the conventional clutch housing, power is transmitted between the transmission case (A) and the rear axle case using two connecting shafts, and the main frame (4) is moved to the position of the conventional clutch housing.
) and rear axle case (B) are connected at the lower side, the position of the step is lowered to create a step-through, and the inside of the transmission case forms two systems that branch from the input shaft.
The travel output shaft is centered and the PTO output shaft (to) is offset.

As described above, the present invention uses the input shaft aε as a common axis, separates the human power shaft rotation power into two directions on the lower life transmission side, and arranges a plurality of shafts in an "n" shape when viewed from the front, one of which is used as the main shaft. The main clutch device is used as a traveling transmission, and the other is mainly a PTO transmission, so the transmission has 4 reverse gears, 16 forward gears, 2 PTO gears, and the main clutch gear in the short transmission case (A) in the longitudinal direction. It is possible to configure a transmission in which both the transmission system and the PTO system are internally installed, and the transmission case can be moved forward by the amount where the clutch housing was located, and the travel output shaft PT can be inserted from below the position where the clutch housing was located.
The O output shaft protruded to the lowest position and power was transmitted to the rear axle case, making it possible to create a step-through tractor with a low seat.

[Brief explanation of drawings]

Figure 1 is an overall side view of an agricultural tractor, Figure 2 is a power transmission diagram of the traveling drive system, Figure 3 is a power transmission diagram of a transmission system that includes a PTO drive and a traveling drive system, and Figure 4 is a transmission diagram. A vertical cross-sectional view of the travel drive system of case (A), Figure 5 is PT.
Longitudinal cross-sectional view of a part where O drive and travel drive system are mixed, No. 6
The figure is a longitudinal sectional view of the rear axle case (B), and Figure 7 is the oil passage plate (1) fixed to the front of the transmission case (A).
07), Fig. 8 is a drawing showing the arrangement of the shaft inside the mission case (A), Fig. 9 is a longitudinal sectional view of the oil passage plate (107), and Fig. 10 is a diagram of the PTO switching case (7). 11 is a front view of the PTO extraction case (110). (A)...Mission case (B)...Rear axle case +181...Input shaft α911201 Gl)@...Traveling system transmission shaft [Co., Ltd.]+
541+551 (support)...PTO system gear shift shaft applicant
Yanmar Diesel Co., Ltd. Agent Patent Attorney Yano
Kotobuki part

Claims (1)

[Claims] With the input shaft as a common shaft, the input shaft and the shear are separated into two directions on the lower transmission side, and the multiple shafts are arranged in an "n" shape when viewed from the front. One is mainly used as a drive system transmission, and the other is A transmission for an agricultural tractor, characterized in that it is primarily a PTO transmission.