JPH02267026A - Transmission device of tractor - Google Patents

Abstract

PURPOSE:To lower the center of gravity by installing a steering shaft and a traveling input shaft on the transmission case on the rear side of an engine and a power intake input shaft on the other side so as to extend these three shafts to the lower side or to the front of an engine. CONSTITUTION:When an engine 1 is driven, a traveling input shaft 8 and a power intake input shaft 10 are transmitted with each other through belts 12 and 13 from a driving shaft 11. When a shaft 8 is rotated, a wheel is transmitted through the traveling transmission device 7 of a transmission case 2, and the shaft 10 transmits a working device through a power intake transmission device 9 on another side. When steering is carried out with a steering handle 3, a front wheel 4 or a rear wheel which is a steering wheel, through a steering shaft 6 on the top of the transmission case 2 is steered interlockingly. Steering of the front wheel 4 is interlocked from the front part of the shaft 6. Thus, the transmission case 2 is installed on the rear side of the engine 1, in which the shafts 8, 10 are installed on the right and left sides centering the shaft 6 positioned on the top, and the shafts 6, 8, 10 and so on are extended to the lower side or to the front of the engine 1 to lower both the height of the engine 1 and that of the case 2.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a tractor transmission device, and relates to related structures such as a traveling transmission device that transmits power to an axle and a power take-off transmission device that transmits power to a working device connected to a vehicle body. It is something.

PRIOR ART AND PROBLEMS TO BE SOLVED BY THE INVENTION In a four-wheel vehicle having front wheels at the front of the vehicle body and a rear axle at the rear, a transmission case is located at the bottom of the vehicle body. In particular, in a configuration in which the transmission case is installed near the front wheel axle that supports the front wheels, the engine is mounted on the upper side of the transmission case, which is bulky and tends to raise the center of gravity and cause instability.

Means for Solving the Problems This invention provides a transmission case (2) on the rear side of an engine (1) that is equipped with a steering wheel (4) by turning a steering handle (3).
(5) A steering shaft (6) interlocked to perform the steering, and a traveling transmission device (7) on one left and right side of this steering shaft (6).
A driving input shaft (8) that inputs input to the power output transmission device (9) and a moving plate input shaft (10) that inputs input to the power output transmission device (9) on the other side are provided. , and the dynamic intake (10) are extended from below to the front of the engine (1), and the front end of the steering shaft (6) is connected to the steering wheel (4).
) (5), which are interlocked to steer the front wheels (4), and the front ends of the travel input shaft (8) and the moving plate input shaft (10) are connected to drive the front side of the engine (1). The tractor transmission device is configured such that the belts (12) and (13) transmit power from the shaft (11), respectively.

Functions and Effects of the Invention When the engine (1) is driven, power is transmitted from the drive shaft (11) to the travel input shaft (8) and the moving plate input shaft (10) via the belts (12) and (13). be done. Travel input shaft (8)
When rotated, the traveling transmission (7) of the transmission case (2)
Power is transmitted to the axle via the moving plate input shaft (10), and power is transmitted to the working device via the other side power take-off transmission device (9). or,
When steering with the steering wheel (3), the steering wheel (4) (
5), the front wheels (4) or the rear wheels (5) are linked to the steering. Among these, the steering of the front wheels (4) is controlled by this steering shaft (6).
) is interlocked from the front end.

As described above, the transmission case (2) is provided on the rear side of the engine (1), and inside the transmission case (2) is provided with a driving input shaft (8) and a driving input shaft (8) on both sides of the steering shaft (6) at the top. A plate input shaft (10) is provided, and these steering shafts (6), travel input shafts (8), moving plate input shafts (10), etc. are extended to the lower side or the front of the engine (1). The front end of the steering shaft (6) among these is interlocked with the steering of the front wheels (4), and the front end of the travel input shaft (8) and the moving plate input shaft (10) are connected to the engine (1). ) From the front drive shaft (11) to the belt (12) (
13) Since the vehicle is a transmission vehicle, the height of both the engine (1) and the transmission case (2) can be lowered to avoid a bulky structure, and the center of gravity can be lowered to effectively maintain the vehicle height. In addition, the steering shaft (6), the traveling input shaft (8) and the moving plate input shaft (10
) etc. are located below the engine (1), but since the front wheel axle that supports the front wheels (4) is located below, they do not come into contact with the soil surface or crops, etc. This allows for a safer configuration.

Embodiment In addition, in the rotation, the front part of the tractor body (19) has a front shaft (
21) and a front axle case (22), and a freely steerable front wheel (4) is mounted on the left and right end portions of the case (22). or,
A rear wheel axle (23) and a rear wheel axle case (24) are provided at the rear, and steerable rear wheels (5) are mounted on both left and right ends of the rear wheel axle case (24). These front axle (4) and rear axle (5) have a four-wheel drive configuration in which power is transmitted by an engine (1) mounted at the front of the vehicle body (19).

The engine (1) is mounted on the upper part of the front axle case (22) at the front of the vehicle body (19), and the transmission case (2) is located behind the engine (1). (25) is a front wheel axle bracket, which connects the engine (1) to the front end surface of the vehicle body and is integrally attached to the front lower part of the engine (1).
The front axle case (22) is supported by a center pivot (20).

The engine (1) is provided with a drive shaft (11), which is an extension of the crankshaft, in the center of the front side in the left and right direction.
The belt (12) transmits power between the upper pulley (26) and the pulley (27) at the front end of the running input shaft (8), and also between the pulley (28) at the front end of the moving plate input shaft (10). Belt between (
13) Transmission. (29) is a clutch pulley that turns on and off the transmission of the belt (12), and is configured to be able to switch to two-speed transmission. (30) is a clutch pulley that turns on/off transmission of the belt (13).

The transmission case (2) has a travel transmission device (7) and a power take-off transmission device (9) at the bottom, and a steering handle (3) at the top.
Steering transmission shaft (31) (32) interlocked with
, and the steering shaft (6), etc., are installed in this transmission case (2).
The bottom surface of the front shaft case (22) is set near the top of the gate-shaped front shaft case (22). The steering power transmission shaft (31), which is rotated through the lower end of the handle shaft (33) of the steering handle (3) and the bevel gear (34), has a gear (35) in the center in the front-rear direction.
A steering transmission shaft (32) parallel to the steering transmission shaft (31) is provided with gears (36) (37) at the front and rear thereof,
These gears (35) and (36) are always meshed to connect each steering transmission shaft (31) (32) to the handle shaft (33).
) to rotate in opposite directions. Further, below both of the transmission shafts (31) (32), longitudinal switching shafts (38) (39) made of spline shafts supported in parallel with these transmission shafts (38) (39) are provided so as to be freely rotatable on the same axis. Fan-shaped front and rear switching gears (40, 41) are spline-fitted to each shaft (38), (39), and are simultaneously moved in the axial direction by a switching shifter (14) to perform a switching operation. These front and rear switching gears (40) (41) have lock pins (42).
(43) are provided and fitted into lock holes (44) and (45) provided in the front and rear walls of the transmission case (2) to fix the front and rear switching gears (40) and (41) so that they cannot rotate. be able to.

The position where these lock pins (42) and lock holes (44) can fit together, or between (43) and (45), is at the neutral position where the steering handle (3) travels straight; The lock pins (42) (43) are attached to the transmission case (2) so that they cannot be engaged at steering angles other than the position.
) and is restrained by contacting the inner wall surface of the

By operating the switching lever (46) on the control device, the switching shifter (14) is activated, and the front and rear switching gears (40) (41)
When the front switching gear (40) is moved to the rear end side, the front switching gear (40) changes to the gear (
36), the rear switching gear (41) is in mesh with the gear (
37), and the lock pin (43) is inserted into the lock hole (4).
5), and only the front switching shaft (38) can be interlocked with the steering by the steering handle (3). When the switching shifter (4) is moved to the center position, the front switching gear (40) meshes with the gear (36), the rear switching gear (41) meshes with the gear (37), and the front/rear switching gear (41) meshes with the gear (37). (W), and the front switching shaft (38) and the rear switching shaft (39) are steered in the same direction. Also, set the switching shifter (14) to the front end position and set the front switching gear (40
) from the gear (36), fit the lock pin (42) into the lock hole (44), and at the same time remove the rear switching gear (41).
is disengaged from the gear (37) and meshes with the gear (35), resulting in rear wheel steering (R) mode, and only the rear switching shaft (39)
The steering handle (3) compared to the case of longitudinal axis steering (W)
The steering is linked in the opposite direction to the steering direction.

The front switching shaft (38) passes through the steering linkage (47),
It is connected to the arms of the left and right front axle cases (48) and is configured to steer and rotate left and right. In addition, the rear switching shaft (39) connects the left and right rear wheel cases (5) via the steering link mechanism (49).
0) is configured to rotate for steering.

The relationship between these steering link mechanisms (47) and (49) is as follows:
In the case of the front and rear axle steering (W) above, the front and rear axles (4,) (5)
are provided so as to be laterally rotated in the same direction.

The travel transmission device (7) has a travel input shaft (8) mounted parallel to one side of the steering shaft (6), and the travel input shaft (8) is mounted on one side of the steering shaft (6).
(16) (17)
The driving transmission shaft (17) is located directly below the steering shaft (6). Further, a back force outer shaft (51) is provided between the travel input shaft (8) and the travel transmission shaft (16). These travel input shafts (8) and travel transmission shafts (16)
) and the back force outer shaft (51), a forward/reverse switching gear (52), counter gear (53), back gear (54), etc. are provided, and the traveling power shafts (1, 6) (17)
A speed change gear (55) that is engaged with the counter gear (53) is provided between them, and is operated by a shift mechanism operated by a speed change lever (56). By inputting and rotating the traveling input shaft (8), the traveling transmission shaft (17) can perform variable speed transmission.

The front end of the traveling power transmission shaft (17) is connected to the front shaft case (2).
2) The left and right front axle shafts (21) are differentially transmitted via the differential transmission device (57) in the center, and the rear end is connected to the rear axle case (21).
4) The left and right rear axles (23) are configured to be differentially transmitted via a differential transmission device (58) in the center.

The power take-off transmission device (9) has a power take-off input 111! l (1
0) is provided on the side opposite to the travel input shaft (8) with respect to the steering shaft (6), and the drive transmission shaft (18) is connected to the travel transmission shaft (1
7), and transmission of variable speed can be performed by meshing the transmission gear (59) on the transmission input shaft (10) with the gear (60) on the transmission transmission shaft (18). The transmission shaft (18) is connected to the reduction gear (6) in the rear axle case (24).
1), the vehicle body (
19) and is configured to protrude from the rear end portion and transmit power to the working device (63).

A driver's seat (64) is provided at the rear of the vehicle body (19), and a lift arm (66) that is moved up and down by a hydraulic bag M (65) is provided below the driver's seat (64). A working device (63) connected to the rear side by an arm (67) so as to be able to move up and down is controlled up and down by the lift arm (66). The working device (63) has a power take-off shaft (6
This is a tillage and weeding management device that is equipped with a tilling shaft (68) that is transmitted from the tilling shaft (68) and that tills the soil surface with the tilling shaft that is disposed along the tilling shaft (68).

(101) is a cultivator.

The belt (12) between the drive shaft (11) and the running input shaft (8) is configured to transmit auxiliary speed change for high speed (H) and low speed (L). Therefore, these belts (H
)(L) is also configured for high speed and low speed.

(69) is the pivot support (7) for the high-speed clutch pulley (29).
0); (71) is the clutch arm (70) that pivots the low-speed clutch pulley (29);
72) (73) are these clutch arms (69) (
71) to the clutch engagement side.

(74) (75) are these clutch arms (69)
The arm (78) is pivoted to the tip of the rotating arm (77) under the operation panel (76) with a wire connected to (71).
) Connect to the lower end of (79). Each of these arms (7
8) The upper end of (79) connects the rods (83) (84) connected to the arms (81) (82) of the sub-shift lever (8o) through elongated holes, and
The clutch pulley (29) for high speed (H) is engaged and the clutch pulley (29) for low speed (L) is engaged by rotating and operating it back and forth.

(85) is the pivot joint of arm (7g) (79), (8
6) is a pivot portion of the arm (77), and (87) is a pivot portion of the sub-shift lever (80).

In addition, the clutch pulley (3o) is connected to the clutch arm (88
) is provided so that the belt (13) for power extraction transmission is tensioned and the clutch is turned off.

(89) is this pivot portion, and (9o) is a spring that springs this clutch arm (88) toward the clutch engagement side.

Further, a wire (9I) is connected to the base end of the clutch arm (88), so that the clutch arm (88) can be operated in conjunction with a bell crank (93) by means of a tarlatch pedal (92). Furthermore, a wire (
96), and when the clutch pedal (92) is depressed, the clutch pulley (30) is operated to the disengaged position, and the arm (95) is provided to rotate against a spring (97). . An arm (98) integrated with this arm (95) has a pivot portion (8) at the tip of the arm (77).
5) with a rod ((99)), and the wire (
96) By being pulled against the spring (97), the arm (77) is moved through the rod (99) as shown by the arrow (A).
direction to loosen the wires (74) and (75), and both the high speed (H) and low speed (L) clutch pulleys (29) can be disengaged. (100) is a stopper that is integrated with the arm ((95), (98), etc.), and is a stopper that allows rotation within a predetermined angular range around the shaft support (94).

By operating the sub-shift lever (80), the high speed (H) clutch pulley (29) or the low speed (L) clutch pulley (
29) to perform the sub-shift of the traveling input shaft (8), but when the clutch pedal (92) is stepped on, not only these clutch pulleys (29) but also the clutch pulley (10) on the moving input shaft (10) 30) will also be cut. For this reason, the forward/reverse switching gear (52) of the traveling transmission (7), the transmission gear (5
5), etc., or when performing a power take-off transmission (9).
When changing speeds using the speed change gear (59), these speed changes can be performed accurately.

[Brief explanation of drawings]

The figures show one embodiment of the present invention; FIG. 1 is a partial front sectional view, FIGS. 2 and 3 are side sectional views, FIG. 4 is a partial front view, and FIG. 5 is a partial front sectional view. 6 is a side view, FIG. 7 is a plan view, FIG. 8 is a front view, and FIG. 9 is a plan view showing a part of the transmission mechanism.
The figure shows a front view, FIG. 10 shows a partial side sectional view, and FIG. 11 shows a partial operation interlocking mechanism diagram. In the figure, code (1) is the engine, (2) is the transmission case, (
3) is the steering handle, (4) is the front axle, (5) is the rear axle, (6) is the steering shaft, (7) is the travel transmission, (8) is the travel input shaft, (9) is the power Take-out transmission device, (10) is a moving input shaft, (11) is a drive shaft, (12) (13) is a belt, (14) is a switching shifter (15) is a neutral display device,
(16) (17) shows the traveling transmission shaft, and (18) shows the moving transmission shaft.

Claims (1)

[Claims] The transmission case (2) on the rear side of the engine (1) has a steering shaft (6) that is interlocked to steer the steering wheels (4) and (5) by steering the steering handle (3). , this steering axis (6
) has a travel input shaft (8) that inputs input to the travel transmission device (7) on one left and right side, and a power output transmission device (9) on the other side.
) is provided, and these steering shafts (6), traveling input shafts (8), and moving input shafts (10) are provided.
is extended to the lower side or the front of the engine (1), and the front end of the steering shaft (6) controls the steering of the front wheel (4) of the steering wheels (4) and (5). The front ends of the traveling input shaft (8) and the moving input shaft (10) are connected to each other from the drive shaft (11) on the front side of the engine (1) to the belt (12) (
13) A tractor transmission device provided for transmission.