JPS6240582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a bearing support device in the case where a height change gear or the like is constructed within a clutch housing.

(B) Prior Art Conventionally, in a tractor, a technique is known in which a clutch housing and a transmission case are connected and a transmission is constructed within the clutch housing.

For example, Publication No. 47406 of 1983.

(c) Problems to be Solved by the Invention In order to obtain more gears in a tractor, there are cases where a high-low speed change device that doubles the rotation of the main speed change device and the auxiliary speed change device is provided in the clutch housing as an option. There is.

In this case, it is necessary to provide an oil bath up to the part of the high/low transmission inside the clutch housing.
A protruding wall is provided at the center of the clutch housing 1, and this protruding wall has an oil-tight structure and serves as an oil bath that communicates the transmission case, the rear axle case, and the clutch housing.

In this case, the front part of the clutch housing has a large opening for assembling the traveling clutch device and the PTO clutch device, but because of the protruding wall, the height and low gear transmission must be inserted and assembled from the rear, and the rear side is also large. It is necessary to open it.

In this case, the shaft of the height/lower transmission cannot be supported until the rear end is connected to the front of the transmission case, and since it is not possible to see the inside during connection, the assembly must be done by hand.

In order to solve these problems, the present invention has a large opening on the rear surface of the clutch housing, and a separate bearing body is fixed to this surface from the rear to support the shaft inside the clutch housing. be.

Also, so that the front part of the transmission case can be assembled to the rear surface of the clutch housing with the bearing body fixed, a recess is provided on the front side of the transmission case to avoid the mounting part of the bearing body. It is.

In addition, by dividing the bearing body into upper and lower halves, 1
Compared to the case of a bearing body configured to close two lids,
The structure is such that bearings can be assembled on multiple shafts in an orderly manner.

(d) Means for Solving the Problems The objects of the present invention are as described above, and the configuration for achieving the objects will now be explained.

A protruding wall 14 is provided in the clutch housing 1 whose front portion is fixed to the rear surface of the engine 40 and whose rear portion is fixed to the front surface of the transmission case 84.
In a configuration in which the rear parts of a plurality of shafts whose front parts are supported by bearings are supported by bearing bodies 12 fixed to the rear surface of the clutch housing 1, the bearing bodies are 12a,
12b, protruding inward of the clutch housing 1, and forming a recess 84a at the joint between the clutch housing 1 and the transmission case 84 into which the mounting portions of the bearing bodies 12a and 12b fit into the front part of the transmission case. It is something.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is a side cross-sectional view of a clutch housing portion of an agricultural tractor according to the present invention, FIG. 2 is a partial rear cross-sectional view of the same, and FIG. 3 is an overall hydraulic circuit diagram of the agricultural tractor.

First, the configuration of the height change gear, which is the main part of the present invention, will be explained based on FIGS. 1 and 2.

The clutch housing 1 has a front portion fixed to the engine 40 and a rear portion fixed to the transmission case 84. A flywheel 28 is fixed to the rear end of the clutch shaft of the engine 40. to the flywheel 28 via a shock absorber device.
A PTO drive shaft 9 is fixedly installed. PTO drive shaft 9
The tip of the flywheel 28 is supported by a bearing in the center of the flywheel 28.

Although the PTO drive shaft 9 is constantly rotating, a hydraulic clutch type PTO clutch device 46 is provided in the rear axle case, and connection and disconnection are performed here.

A spacer 29 is fixed to the flywheel 28, and a travel clutch device is pressed against the rear surface of the spacer 29 to connect and disconnect the travel power.

The traveling clutch is connected and disconnected by depressing the clutch pedal 41, which causes the bell crank 16 to rotate around the pivot shaft 17 via the link 51, and slide the sliding tube 18 back and forth. A clutch release bearing 20 is provided on the sliding tube 18, and the clutch release bearing 20 allows the arms 30, 30 to be
The running clutch is engaged and disconnected through the intervention of the

The rotation of the traveling clutch is transmitted to the traveling drive shaft 10, and the rotation of the traveling drive shaft 10 is transmitted to the fixed gear 5 and the hydraulic clutch case 2 of the hydraulic clutch device A, which are connected by a key.

The traveling drive shaft 10 is a cylindrical shaft, through which the aforementioned PTO drive shaft 9 passes.

The traveling drive shaft 10 is supported at the front by a bearing 59 on the protruding wall 14 of the clutch housing 1, and at the rear by a coupling 27 at the connection part of the PTO drive shaft 9.
It is supported by needle bearings on the outer periphery of. The fixed gear 5 and the hydraulic clutch device A are supported on this traveling drive shaft.

The fixed gear 4 to which power is transmitted from the hydraulic clutch device A is fixedly installed on the traveling transmission shaft 62 and has a bearing 6.
3, the outer diameter is supported by a bearing. The bearing 63 is fixed to a bearing body 12a fixed to the rear surface of the clutch housing 1.

Further, a counter shaft 11 is parallel to the traveling drive shaft 10.
is provided. The front end of the counter shaft 11 is supported by a bearing on the projecting wall 14, and the rear end is supported by a bearing in a bearing 83 of a bearing body 12b fixedly projecting from the rear wall of the clutch housing 1.

A hydraulic clutch device B is mounted on this counter shaft 11.
is fixed with a key and serves to integrate the loose-fit gear 6, which is always meshed with the fixed gear 5, with the counter shaft 11. The fixed gear 13 at the rear end is a traveling transmission shaft 62
It is always meshed with the upper fixed gear 4.

The hydraulic clutch device A is a normally engaged hydraulic clutch device, and the hydraulic clutch device B is a normally disconnected hydraulic clutch device.

The hydraulic clutch device A has a retaining ring at the rear end of the clutch case 2, and a leaf spring 35 is interposed on the inner periphery.
Normally, the plate spring 35 pushes the pressure plate 37 to bring the friction plates 36 into close contact with each other to transmit power. When the pressure oil is sent, the actuator 7 in the clutch case 2 is pushed backward by the pressure oil, and the rear end pushes the pressure plate 37, causing the leaf spring 3
5 to the rear to release the crimped state of the friction plate 36. As a result, when pressure oil is sent, power is cut off.

When the hydraulic clutch device B is not supplied with pressure oil, the actuator 8 is actuated by the spring 65.
is pushed back and the friction plate 66 is in the disconnected state, and when the pressure oil is sent, the actuator 8 moves rearward against the spring 65 and presses the friction plate 66.

The pressure oil passage to the hydraulic clutch device A is from the oil passage 22 of the transfer tube provided in the boss portion of the fixed gear 5 in FIG.
The oil enters the inner diameter oil passage 26 of the rear end boss portion of the fixed gear 5 and is sent to the friction plate 36 for lubrication. Further, the oil enters the hydraulic cylinder inside the actuator through the groove 24 from the oil passage 23 of the transfer tube.

In this way, grooves 25 and 24 are provided on the outer periphery of the travel drive shaft 10, which is a cylindrical shaft, and a fixed gear is fitted onto the grooves to close the top surface, thereby forming an oil passage without making a through hole. -ing

Further, the pressure oil of the hydraulic clutch device B comes out into the hole inside the bearing cover 21. Counter shaft 1 in this hole
1 is fitted into the oil passage 11a in the counter shaft 11, and enters the hydraulic cylinder between the actuator 8 and the clutch case 3.

Further, as shown in FIG. 1, the bearing 59 of the protruding wall 14
The bearing cover 19 also serves as a guide tube for the sliding tube 18.

The high-low speed change operation will be explained using the configuration shown in FIG.

When the hydraulic control valve 42 for high-low speed change is on the high speed side, no pressure oil is sent, the hydraulic clutch device A is in the engaged state, the hydraulic clutch device B is in the disengaged state, and the traveling power is transferred from the traveling drive shaft 10 to the hydraulic pressure. The running power transmission shaft 62 is connected via the clutch device A, the friction plate 36, and the fixed gear 4.
It has been reported to.

When the hydraulic control valve 42 is on the low speed side, pressure oil is simultaneously sent to the hydraulic clutch devices A and B, so that the hydraulic clutch device A is in the disengaged state and the hydraulic clutch device B is in the disengaged state.
are in contact, the running power is transmitted from the fixed gear 5 to the loosely fitted gear 6 via the running drive shaft 10, and the friction plate 6
6 and is transmitted to the counter shaft 11 via the hydraulic clutch device B.

Thereafter, the speed is transmitted from the fixed gear 13 to the fixed gear 4 of the traveling transmission shaft 62, and the speed becomes low.

In the overall hydraulic circuit diagram of FIG. 3, the hydraulic clutch device B on the counter shaft 11 and the fixed gear 13
The case is shown in which the positions of are reversed.

In such a configuration, the hydraulic clutch devices A and B for high/low speed shifting, the gears 4, 6, 13, the counter shaft 11, etc. must be inserted from the rear because the protruding wall 14 is located in the center, and the clutch housing 1
The rear side has a large opening.

Then, the PTO transmission shaft 61, the traveling transmission shaft 62,
The counter shaft 11 must be supported by the front bearing wall of the transmission case 84, and the clutch housing and the transmission case must be fixedly connected without being visible from the outside, with the shaft hanging in the air. be.

In the present invention, in order to solve this problem, the bearing bodies 12a and 1 are fixedly installed on the rear surface of the clutch housing 1.
2b, which protrudes inward from the clutch housing. Furthermore, since the upper and lower shafts that integrate the bearing bodies 12a and 12b must be assembled at the same time, the bearing bodies 12a and 12b are separated into two parts.

Furthermore, since it is necessary to securely connect the front surface of the transmission case 84 with these bearing bodies 12a and 12b fixedly installed on the rear surface of the clutch housing,
A recess 84a is provided in the front of the mission case,
The structure is such that the mounting portions of the bearing bodies 12a and 12b are avoided. If the mounting surfaces of the bearing bodies 12a, 12b to the clutch housing 1 are made into concave portions, this surface will also need to be machined, resulting in double machining.

Referring to FIG. 3, the entire hydraulic circuit will be explained.

Two hydraulic pumps 3 are activated by the rotation of the engine 40.
8 and 45 are rotated. The pressure oil of the hydraulic pump 45 is
The PTO hydraulic clutch device 46 is connected and disconnected via the PTO hydraulic control valve 43. 57 is a safety device that prevents the PTO shifter shaft from sliding when the clutch is engaged.

Further, the pressure oil of the hydraulic pump 38 passes through a front wheel drive hydraulic control valve 44 and is then supplied to a front wheel drive hydraulic clutch device 5.
6 is connected and disconnected, and then, through the hydraulic control valve 42 for the hydraulic clutch device for high-low speed change, the hydraulic clutch devices A and B, which are the main parts of the present invention, are simultaneously reversed to connect and disconnect. It enters the hydraulic control valve 39 for the prevention brake and pushes the hydraulic cylinder 54 for preventing inertial slippage.

The hydraulic control valve 39 for preventing inertial slippage is operated in conjunction with the travel clutch pedal 41.

48, 48 are steering brake devices, and when the left and right steering brake pedals 49, 49 are depressed, pressure oil is sent from a pump to perform braking.

The cross-sectional portion of FIG. 2 shows an inertial slip prevention brake device. When pressure oil is sent from the hydraulic control valve 39 for preventing inertial slippage through the piping 54b, it enters the hydraulic cylinder 54, pushes the actuator 54a inward against the spring 54c, and moves the brake body 82 to the pivot shaft 81. It is rotated around , and pressed against the outer periphery of the hydraulic clutch case 2 of the hydraulic clutch device A. The pivot shaft 81 projects rearward from a mounting body 80 fixed to the rear surface of the projecting wall 14.

Numerals 85 and 86 are bolts for fixing the mounting surfaces of the bearing bodies 12b and 12a to the rear surface of the clutch housing 1.

(F) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

First, by arranging the bearing bodies 12a and 12b so as to protrude inside the clutch housing 1,
The transmission chamber configured at the rear of the clutch housing 1 can be configured to be large, and by arranging the high and low transmission devices as close to the front as possible, the transmission inside the next transmission case 84 can be located at the front. This allows the overall length of the transmission case 84 to be shortened.

Second, since the bearing bodies 12a and 12b do not protrude into the transmission case 84, the structure of the transmission case 84 is the same as that of the conventional transmission case M without a height/low speed change device. By replacing the clutch housing 1, it is easy to make different versions with and without a high/low speed change gear.

Thirdly, since the bearing body 12 attached to the rear surface of the clutch housing 1 is divided into upper and lower bearing bodies 12a and 12b and configured to support a plurality of shafts, the conventional technique is disclosed in Japanese Utility Model Publication No. 56-47406. As with the described technology, it was possible to eliminate the complexity of assembly that occurs when multiple upper and lower shafts are supported by bearings using a bearing body made up of a single-plate cover attached from the rear of the clutch housing. It is something. That is, by sequentially assembling the bisected bearing bodies 12a and 12b vertically, it is possible to eliminate the complexity of inserting two shaft bearings at once.

Fourthly, since the concave portion is formed at the front end of the transmission case 84 to avoid the tightening and fixing surfaces of the bearing bodies 12a and 12b, it is only necessary to avoid the tightening and fixing surfaces. as,
This eliminates the need to make the entire opening at the front end of the mission case 84 large.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view of a clutch housing portion of an agricultural tractor according to the present invention, FIG. 2 is a partial rear cross-sectional view of the same, and FIG. 3 is an overall hydraulic circuit diagram of the agricultural tractor. A, B...Hydraulic clutch device, 1...Clutch housing, 9...PTO drive shaft, 10...Travel drive body, 11...Counter shaft, 12a, 12b
... Bearing body, 61 ... PTO transmission shaft, 62 ... Traveling transmission shaft, 84 ... Mission case, 84a ...
...concavity.

Claims (1)

[Claims] 1 A protruding wall 14 is provided in the middle part of the clutch housing 1 whose front part is fixed to the rear surface of the engine 40 and the rear part is fixed to the front surface of the transmission case 84, and the front part is supported by bearings on the protruding wall 14. In the structure in which the rear part of the shaft is supported by a bearing body 12 fixed to the rear surface of the clutch housing 1, the bearing body is divided into two parts 12a and 12b, which protrude inward of the clutch housing 1, and are connected to the clutch housing 1. A transmission device for an agricultural tractor, characterized in that a recess 84a is formed in the front part of the transmission case at the joint part of the transmission case 84, into which the mounting parts of the bearing bodies 12a and 12b fit.