JPH0725276B2 - Travel transmission structure of agricultural tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a main clutch case at the front of the machine body,
It is possible to switch between a front mission that receives the output from the main clutch mechanism and transmits it to the rear mission at the rear of the machine, a standard drive state in which the front wheels are driven at approximately the same speed as the rear wheels, and a high speed drive state in which the front wheels are driven at a higher speed And a front wheel transmission are housed in a front transmission case and attached to the rear surface of the main clutch case.

[Conventional technology]

In the traveling power transmission structure of this type of agricultural tractor, the front transmission mechanism in the transmission case directly connected to the rear surface of the main clutch is located behind the on / off operation clutch sleeve of the main clutch mechanism (for example, JP-A-60-121120). Or Japanese Patent Laid-Open No. 60-8167).

[Problems to be solved by the invention]

In this case, the main clutch case and the front mission case are inevitably lined up in the front and rear, so that each occupies the space required for the front and rear, the front mission case is placed in the intermediate space between the front and rear wheels. However, there was a problem that the installation space for implements such as mid mount mowers was restricted and the driver's foot space was narrowed.

In particular, if a front wheel transmission (9) as shown in FIG. 1 is installed in the front transmission, the front wheel transmission (9) is simply arranged behind the clutch sleeve (50). Since the transmission (9) has a mechanism that occupies a large space such as a unique clutch mechanism, the amount of protrusion to the rear is increased, and
It has a great impact on the driver's foot space.

An object of the present invention is to provide one that can be compactly made by effectively using the space and can reduce the influence on the driver's foot space.

[Means for Solving the Problems]

As described at the beginning, the characteristic configuration according to the present invention includes the main clutch case, the front transmission and the front wheel transmission are housed in the front mission case, and the traveling transmission of the agricultural tractor is attached to the rear surface of the main clutch case. In the structure, a partition wall in the form of a vertical wall that separates the internal spaces is set at an integrated connection portion between the main clutch case and the front transmission case, and the position is set immediately behind the clutch sleeve that operates the clutch mechanism. Then formed
A support portion of a bearing bearing of an output shaft to which the output from the main clutch mechanism is transmitted is formed to bulge rearward from the partition wall, and a bearing bearing on a front end side of a transmission shaft to which power from the output shaft is transmitted. Of the front wall of the front wheel transmission is formed by bulging the support portion of the front wall from the partition wall to the front side.
The bearing of the transmission shaft is located further to the front side than the supporting portion of the bearing, and the function and effect are as follows.

[Work]

According to the above feature, since the partition wall is arranged immediately behind the clutch sleeve, the front-rear dimension of the main clutch case can be minimized, and the support portion of the bearing bearing of the output shaft can be located rearward from the partition wall. Therefore, the output shaft can be supported without changing the position of the partition wall, and the support portion of the bearing bearing on the front end side of the transmission shaft is located forward of the partition wall. The front end side position of the transmission shaft is deviated to the front side compared to the one formed on the rear surface side to enable reduction of the front-rear dimension of the front transmission case, and further to the front side of the support portion of the bearing bearing of the transmission shaft. Since part of the front end of the front wheel transmission is located at
The rear end position of this front wheel transmission can be displaced forward.

That is, there is a dead space around the clutch sleeve inside the main clutch case, and the present invention sets the partition wall at a position where the front-rear dimension of the main clutch case is minimized, and the dead space is transmitted to this dead space. The front end of the shaft is positioned and the front wheel transmission is greatly inserted into this dead space, so that the front-rear dimension from the main clutch case to the front transmission case to the front wheel transmission can be reduced.

〔The invention's effect〕

As a result, by effectively utilizing the dead space of the main clutch case, the main clutch, the front transmission case, and the front wheel transmission were compactly arranged, and an agricultural tractor capable of reducing the influence on the driver's foot space was reasonably constructed.

〔Example〕

As shown in FIG. 3, an engine (1), a radiator (2) are provided at the front of the fuselage, and a steering handle (3) is provided behind them.
And a rear drive case (5) and a link mechanism (6) that connects the rear mission case (5) and the tiller etc. so as to be able to move up and down. (7) and (8) are arranged to form a four-wheel drive agricultural tractor.

As shown in FIGS. 1 and 2, the main clutch case (10) is mounted on the rear surface of the engine (1), and the front mission case (11) is mounted on the rear surface of the main clutch case (10). . The front mission case (11) has a first front mission (41) which receives power from the main clutch mechanism (14) and outputs it to the rear mission, and a front wheel () which receives output from the rear mission case (5). The front wheel transmission (9) and the second front transmission (42), which will be described later, are output. On the other hand, the front mission case (11) and the rear mission case (5) are connected by a box-shaped sheet metal frame (43), and the box-shaped sheet metal frame (43).
Transmission shaft (44) for connecting front and rear missions,
(45) has been deployed. The lowest position of the front and rear mission cases (11), (5) is taken as the lowest height position, and the main clutch case (10) and the engine (1) are positioned above to achieve a high ground clearance.

The arrangement of the front wheel transmission (9) described later will be described. As shown in FIG. 2, a front clutch case (11) in which a main clutch case (10) is connected to the rear surface of the engine (1) and a front wheel transmission (9) is mounted on the rear surface of the main clutch case (10). ) Is integrally formed.
A steering gear box (13) having a handle operating shaft (12) supported thereon is fixed to the upper surface of the front mission case (11). Next, the transmission system from the main clutch to the front wheel transmission (9) will be described. As shown in FIG. 1, the output shaft (15) provided with the main clutch mechanism (14) is connected to the main clutch case (10). The rear transmission case (15) side input shaft (1) is located below the output shaft (15) and is supported in the front mission case (11) by being projected.
6), a first transmission shaft (17), a second transmission shaft (18) below which receives front wheel drive force from the mission case (5), and a second transmission shaft (18) A third transmission shaft (19) whose one end is relatively rotatably fitted and held in a state in which the shaft center is aligned with the inner end, and the third transmission shaft (19) is further connected to the front axle case (20) below the third transmission shaft (19). 4 transmission shafts (21) are provided respectively. The first gear (22) on the output shaft (15)
And the second gear (23) is attached to the first transmission shaft (17), and the first transmission shaft (17) is passed through the first front mission (41).
The power transmitted to the rear transmission case (5) from the first transmission shaft (17) is transmitted to the second transmission shaft (18) as front wheel drive force. On the other hand, a relay transmission member (26) integrally formed with a pair of large and small third gears (24) and fourth gear (25) is loosely fitted to the first transmission shaft (17), and at the same time, the third transmission shaft (19). Friction multi-plate clutch mechanism (27)
And the inner end of the second transmission shaft (18) to the fifth gear (2
8) is integrally formed. Here, the clutch mechanism (2
7) is the 6th gear (2) that constantly engages with the 3rd gear (24)
9) formed clutch body (30), a rotating member (31) that cooperates with the clutch body (30) to support the friction plate, and a piston (32) that acts on the friction plate at one end. It is composed of an inner tooth gear (18A) of the second transmission shaft (18) and a clutch sleeve (33) provided with an outer tooth gear which is free from occlusion at the end. Furthermore, the front end of the third transmission shaft (19) and the fourth end
A seventh gear (34) and an eighth gear (35) are spline-fitted to the rear ends of the transmission shaft (21) to form a second front mission (42).

Therefore, the clutch sleeve (33) is connected to the second transmission shaft (1
When occluded with the internal gear (18A) of 8), the second transmission shaft (1
The power transmitted to 8) is transmitted to the third transmission shaft (19) via the clutch sleeve (33), and the front drive state (7) and the rear wheel (8) are driven at substantially the same speed. When the clutch sleeve (33) is operated to the opposite side and the friction multi-plate clutch mechanism (27) is operated, the power transmitted to the second transmission shaft (18) is transmitted to the relay transmission member (26) and the clutch. It is transmitted to the third transmission shaft (19) through the body (30), and causes the front wheels (7) and the rear wheels (8) to express a high speed driving state in which they are driven at high speed.

The operation mechanism for the front wheel transmission (9) as described above will be described in detail. As shown in FIG. 2, the operating mechanism (49) is
The front transmission case (11) is equipped with a mounting case (36) as a lid member which is detachably attached to the lateral side surface of the front mission case (11) with a bolt.

A sideways operating shaft (37) is pivotally supported with respect to the mounting case (36) and the steering gear box (1
Pitman arm (38) pivotally supported by 3) and operation axis (3
The operation arm (39) fixed to 7) is connected by a link plate (40) as a mechanical linking mechanism, and the clutch mechanism (27) is operated by a steering operation.

Next, the main clutch mechanism (14) will be described. The main clutch mechanism (14) is a single type dry clutch and cooperates with the flywheel (46) to sandwich the pressure plate (48) between the clutch plates (47). ), The clutch sleeve (50) located behind the pressure plate (48), and the clutch sleeve (50) against the diaphragm spring (51) so that the pressure plate (48) is pressed from the clutch disc (47). It consists of an operation arm (52) for retracting. A sleeve guide (53) slidably fitted on the clutch sleeve (50) is fitted on the output shaft (15) to form a partition wall (55) formed between it and the front mission case (11). It is held in the boss. An oil seal (54) for preventing oil leakage from the front mission case (11) is fitted inside the partition wall (55) side of the sleeve guide (53) without disassembling the front mission case (11). It can be removed independently from the clutch side.

Further, the partition wall (55) is arranged immediately after the clutch sleeve (50), and the bearing of the output shaft (15) is mounted on the support portion (56) which is formed to bulge on the rear side of the partition wall (55). A bearing (57) is arranged, and a bearing portion (59) on the front end side of the first transmission shaft (17) is arranged on a support portion (58) formed to bulge on the front side of the partition wall (55). This first transmission shaft (17)
A part of the front end of the front wheel transmission (9) is arranged in front of the support portion (58) of the bearing (59).

As described above, the partition wall (55) is connected to the main clutch case (10).
The front end of the first transmission shaft (17) is located in the dead space inside the main clutch case (10), and the front wheel transmission (9) is located in this dead space. The main clutch case (10) to the front transmission case (11),
The front-rear dimension over the front wheel transmission (9) can be reduced.

[Another embodiment]

Although not shown, the transmission (9) is arranged so that the third gear (24) is located below the clutch sleeve (50).
May be inserted into the main clutch side.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the traveling transmission structure of an agricultural tractor according to the present invention. Fig. 1 is a vertical sectional side view showing the internal structure of a front mission and a clutch case, and Fig. 2 shows a connected state of a front mission and a rear mission. A side view and FIG. 3 are side views of the agricultural tractor. (7) …… Front wheel, (8) …… Rear wheel, (9) …… Front wheel transmission, (10) …… Main clutch case, (11) …… Front transmission case, (14) …… Main clutch mechanism ,(Four
1) …… Front mission, (50) …… Clutch sleeve, (55) …… Partition wall, (56) …… Supporting part, (57)…
… Bearing bearing, (58) …… Supporting part, (59) …… Bearing bearing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Aoyama 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Iron Works Co., Ltd. Sakai Works (56) Reference JP-A-1-226439 (JP, A)

Claims (1)

[Claims] Claims: 1. A main clutch case (10) is arranged in the front part of the machine body, and a front mission (41) which receives and transmits an output from the main clutch mechanism (14) to a rear mission in the rear part of the machine body and front wheels (7). A front wheel transmission (9) capable of switching between a rear wheel (8) and a standard drive state in which the rear wheel (8) is driven at a substantially constant speed and a high speed drive state in which the rear wheel (8) is driven at a higher speed. A traveling transmission structure for an agricultural tractor housed inside and attached to the rear surface of the main clutch case (10), wherein the main clutch case (10) and the front transmission case (11) are integrally connected to each other. A vertical wall-shaped partition wall (55) that separates the internal space is provided to the main clutch mechanism (1
4) A bearing is formed on the output shaft (15), which is formed by setting the position immediately after the clutch sleeve (50) for turning on and off, and to which the output from the main clutch mechanism (14) is transmitted.
The support portion (56) of 7) is formed so as to bulge rearward from the partition wall (55), and the bearing bearing (at the front end side of the transmission shaft (17) to which power from the output shaft (15) is transmitted ( The support part (58) of 59) bulges forward from the partition wall (55),
Further, the traveling transmission structure for an agricultural tractor, wherein a part of the front end of the front wheel transmission (9) is located further forward than the support portion (58) of the bearing bearing (59) of the transmission shaft (17).