JPS6181819A - Power transmission system for riding type working machine - Google Patents

Abstract

PURPOSE:To reduce the size and to facilitate boring for bearing and maintaining of car height in power transmission system for agricultural tractor by journaling the back/fro transmission shaft to front case while the left/right rear wheel drive shaft and the upper power take-out shaft in rear case. CONSTITUTION:The input and output shafts 13, 18 are arranged respectively at the highest and lowest position against the transmission case 10 while main and intermediate shafts 15, 17 are arranged between them to direct the axes in back/fro direction and to journal the parallel transmission shafts in the front case 11. In the rear case 12, rear wheel drive shaft (not shown) extending from the output shaft 18 of transmission through bevel gears 28, 29 to the let and right of chassis is arranged in the rear case 12. Similarly, power take-out shaft is arranged through bevel gears 37, 38 in the rear case 12 at the read end of main shaft 15. with such arrangement, space in transmission case can be utilized effectively to reduce the size and to maintain the car height easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power transmission device for a riding machine such as an agricultural tractor.

(Prior art) In riding working machines such as agricultural tractors, it is common for the engine to be mounted vertically in the front of the vehicle body, and the transmission case to be placed in the rear of the vehicle body. There is also a type that allows all wheels to be driven.

Generally, a working machine is installed at the rear of the vehicle body, and the working machine is driven from a power take-off shaft provided in the transmission via a transmission 1ffi.

(Problem to be solved by the invention) By the way, when the engine is mounted vertically, it is better to connect the crankshaft facing in the longitudinal direction of the vehicle body and the transmission input shaft almost in a straight line via the propulsion shaft, which requires a bevel gear. The structure is simple and assembly is easy.

In addition, in order to transmit the driving force to the front wheels, it is necessary to connect another propulsion shaft to the transmission output shaft, and if this transmission output shaft is also arranged parallel to the transmission input shaft, the structure can be similarly simplified by two sets. Easy to attach.

On the other hand, if the rear wheel drive shaft and the power take-off shaft are provided horizontally in the width direction of the vehicle body, the structure will be simpler and assembly will be easier.

However, when incorporating a large number of axes in the longitudinal direction of the vehicle body and axes in the width direction of the vehicle body within the transmission case, it is necessary to consider the ease of drilling holes for the bearings and to arrange each shaft compactly within the transmission case. desirable.

Furthermore, when considering the minimum ground clearance of the vehicle body, if the power take-off shaft is placed below the rear wheel drive shaft, the minyon case will protrude downward, making it impossible to gain ground clearance.
Further, in the case of a model in which the vehicle height can be adjusted, there is a possibility that the power transmission device for the working machine connected to the power take-off shaft may interfere with the wheel support member etc. when adjusting the vehicle height, which is not preferable.

Therefore, an object of the present invention is to effectively utilize the space inside the mission case to arrange each unit compactly, and to
To provide a power transmission device for a riding working machine that facilitates drilling of holes for bearings provided in a transmission case, and also enables effective handling of securing ground clearance and adjusting vehicle height.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a front vertical engine (two
) output shaft (3) and the input shaft (13) of the rear M transmission
) is connected almost in a straight line through the propulsion shaft (0), and a shaft (15 ), (
18) and (17) are disposed and supported by bearings, and a propulsion shaft (3) for transmitting driving force to the front wheels (8) and (6) is connected to the front end of the mission output shaft (18).

This output shaft (18)? & rear wheel drive shaft (31) at the end,
(31) are arranged horizontally in the width direction with almost orthogonal meshing,
Furthermore, the power take-off shaft (41) for the W operation of the work machine is arranged horizontally in the width direction with almost orthogonal meshing with the rear end of the shaft (15) between the mission input/output shaft (+3) and (18). The power take-off shaft (4) is arranged above the rear wheel drive shaft (31), (31), and these shafts (31,), (31) are placed in the rear case (12) of the transmission case (lO). ), (41
) is supported by bearings.

(Example) Examples will be described in detail below based on the accompanying drawings.

Figure 1 shows a cutaway side view of the riding work fi (+), in which the engine (2) with the crankshaft (3) vertically mounted is mounted on the front of the vehicle, and the transmission case (10) is located at the rear of the vehicle. The transmission input shaft (13) and the crankshaft (3) are connected almost in two straight lines via the propulsion shaft (4), and the passenger seat (5) is placed a on the rear of the vehicle. Front wheels (6), (8) and rear wheels (7), (7) have the same diameter on both sides.
Equipped with a steering wheel (8), such a work vehicle can perform front and rear wheel steering by operating the handle (8), and is capable of four-wheel drive.

The inside of the mission case (lO) is as shown in Fig. 4, and the input shaft (13) and the main shaft (15) are connected to each other by a chain sprocket and a clutch mechanism (14) so that power can be connected and disconnected. A transmission gear train (13) is configured from the main shaft (15) to the transmission shaft (16), the intermediate shaft (17), and the mission output shaft (1B), and the gear (2) on the output shaft (18)
1).

A shifter (23) is spline-fitted onto the shaft between (22) and the shifter (23) is selectively engaged with one of the gears using dog clutches (24) and (25). 18) is driven at variable speed. The front end of this mission output shaft (18) and the differential input shaft (51) of the differential case (50) arranged below the engine (2) are connected to the propulsion shaft (9).
) to concatenate.

In the above, the input shaft (13) is at the highest position, and the output shaft (18)
) is at the lowest position, and between them the gear shift shaft (18)
, a main shaft (+5), and an intermediate shaft (17) are arranged, and the transmission shafts, which are vertically parallel with these axes oriented in the front-rear direction, are supported by bearings in the front case (11) of the mission case (10).

As shown in Fig. 5, the gear case (27) of the differential (26) is meshed almost orthogonally with the rear end of the transmission output shaft (18) using bevel gears (28) and (29).
The rear wheel drive shaft (3
1), (31) above are drum brakes (32), (3
2) will be provided. That is, the brake drum (33) is spline-fitted onto the middle part of the drive shaft (31), and the brake drum (33) is spline-fitted onto the middle part of the drive shaft (31).
5) Bolt the holder cover (36) that holds the holder to the side wall of the mission case (lO).

Furthermore, a bevel gear (37) is attached to the rear end of the main shaft (15).
As shown in Fig. 5, the power take-off shaft (41) loosely fitted with the left and right bevel gears (38) and (39) meshing with this bevel gear (37) is horizontally moved in the width direction of the vehicle body, and the main shaft (15) Place it perpendicular to. This power take-off shaft (
41) A shifter (43) is spline-fitted onto the shaft between the left and right bevel gears (38) and (39), and the support shaft (44) is installed above and parallel to the power take-off shaft (4]). By supporting the shifter (43) and selectively engaging the shifter (43) with one hevel gear using the dog clutch (45) and (4G), the power take-off shaft (41) is driven in forward and reverse rotation. One end of this power take-off shaft (41) (
42) protrudes from the side wall of the mission case (10), and a working machine such as a rotary working machine (not shown) is connected to one end (42) of the working machine via a transmission ff1 (411). The working machine is supported by a switch (4S) so that it can be raised and lowered.

In the above, the rear wheel drive shafts (31), (31) and the power take-off shaft (41) are vertically parallel with their axes oriented in the left-right direction.
and are supported by bearings in the rear case (12) of the transmission case (10).

By the way, the left and right front wheel drive shafts (52) of the differential case (50) are equipped with a linked M shaft (5
3) to the input shaft (5) of the reduction case (54).
5) and attach the front wheel (6) to the output shaft (56). The reduction case (54) is the kingpin (57)
.

(57) is supported by the knuckle (58) in a freely steerable manner,
A knuckle 7-m (53) is fixed on the case (5B), and a steering gear box (80) shown in FIG.
The link mechanism (81) extending in the front-rear direction is connected to the knuckle arm (53) by a tie rod (81).
2) to the knuckle (58), and then attach the knuckle holder (6) to the knuckle (58).
3) Attach the knuckle (82) to the upper, middle, and lower mounting holes (a).

(b) and (c) are fixed so that the height can be adjusted.

Similarly, the input shaft (87) of the reduction case (66) is connected to the rear wheel drive shaft (31) via a chain MM (85) as shown in FIG. (7)
Attach. This reduction case (6θ) is also supported by the knuckle (72) with king pins (71) and (71), and the knuckle 7-m (73) is fixed on the case (8B).
) and the link mechanism (81) are connected by a tie rod (74), the upper arm (75) is pivotally attached to the knuckle (72), and the upper, middle, and lower parts of the knuckle (72) are attached to the knuckle holder (7B). Height yI at holes (a), (b), and (c)
Fix it in an adjustable position.

In this way, the front case (1) of the mission case (10)
1) Mission axis (+3) with the axis directed in the front-rear direction
, (15), Cl6), (+7), and (+8) are all supported by bearings, and inside the rear case (12) are upper and lower rear wheel drive shafts (31), (31) with their axes oriented in the left-right direction. , because the power take-off shaft (41) and support shaft (44) were supported by bearings,
The min-on case (work 0) can be configured compactly by effectively utilizing the internal space.In particular, the front case (11) has a bearing hole in the rear direction, and the rear case (12) has a bearing hole in the left and right direction. It is only necessary to form the bearing hole, and therefore, it is sufficient to perform drilling in only one direction for the front and rear cases (It) and (12), which facilitates the machining.

And inside the rear case (12) is a rear wheel drive shaft (31).

Forward/reverse rotation switching device (38), (311), (43) for differential (2B) and power take-off shaft (41) for (31)
, (45), and (48), the mission axis (
+3), (15), (Iff), (+7).

(18) The above structure can be simplified.

Furthermore, the power take-off shaft (41) is connected to the rear wheel drive shaft (31), (3
Since it is placed above 1), the mission case (10)
The power transmission device (48) for the work equipment is connected to the power take-off shaft (41), which can increase the ground clearance and also when adjusting the vehicle height.
will not interfere with wheel support members, etc.

(Effects of the Invention) As described above, according to the present invention, the transmission shaft with its axis oriented in the longitudinal direction is housed in the front case, and the rear wheel drive shaft and the power take-off shaft with their axes oriented in the left-right direction are housed in the front case. The transmission is constructed by supporting each shaft with bearings inside the rear case, and the power take-off shaft is placed above the rear wheel drive shaft, so the space inside the transmission case can be used effectively and each shaft can be arranged compactly. This makes it possible to make the transmission case more compact, and in particular, facilitates the drilling of holes for bearings in the mixer case, as well as effectively securing ground clearance and adjusting the vehicle height.

[Brief explanation of drawings]

Figure 1 is a cutaway side view of the riding work machine, Figure 2 is a front view of the front wheel support, Figure 3 is a rear view of the rear wheel support, Figure 4 is a longitudinal side view of the transmission case, and Figure 5 is a front view of the front wheel support. FIG. 4 is a sectional view taken along the line-v of FIG. In one drawing, (1) is a riding work machine, (2) is an engine,
(3) is the output shaft, (4) and (9) are the propulsion shaft, (8)
, (7) is the wheel, (IQ) is the mission case, (
! 1) is the front case, (12) is the rear ace, (13)
, (15), (18). (17), (18) are transmission shafts, (2B) is differential, (31) is rear wheel drive shaft, (41) is power take-off shaft, (38), (39). (43), (45), and (46) are forward/reverse rotation switching devices, (5G) is a differential case, and (52) is a front wheel drive shaft.

Claims (1)

[Claims] In a riding work machine that has an engine vertically mounted on the front of the vehicle body, a transmission case located at the rear of the vehicle body, and wheels that can be driven on both the front and rear sides of the vehicle body, the engine output shaft and the mission input shaft are connected via a propulsion shaft. At the same time, the transmission shaft up to the transmission output shaft is arranged parallel to the transmission input shaft, and bearings are supported in the front case of the transmission case, and the front end of the transmission output shaft provides the driving force to the front wheels. While the propulsion shaft for transmission is connected, the rear wheel drive shaft is arranged horizontally in the width direction with almost orthogonal meshing with the rear end of the transmission output shaft, and the rear end of the transmission shaft between the transmission input and output shafts is connected. A power take-off shaft for driving the work machine is arranged horizontally in the width direction with substantially orthogonal meshing with the power take-off shaft, and the power take-off shaft is arranged above the rear wheel drive shaft, and these power take-off shafts and the rear wheel drive shaft are arranged horizontally in the width direction. A power transmission device for a riding working machine, characterized in that a shaft and a shaft are supported by bearings in a rear case of a transmission case.