JPS6364662B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to the construction of an oil passage in a hydraulic clutch type transmission.

(B) Prior Art In a conventional hydraulic clutch type transmission, the oil supply path to the hydraulic clutch was constructed by an oil path bored in the shaft in which the hydraulic clutch device was installed.

For example, it is disclosed in Japanese Utility Model Application Publication No. 55-127159.

(c) Problems to be Solved by the Invention In the case of the present invention, when the shaft on which the hydraulic clutch device is installed is a cylindrical shaft, a through shaft is disposed inside the cylindrical shaft. Since it is difficult to provide an oil passage through the cylinder shaft, a groove is provided on the outer periphery of the cylinder shaft, and the outer periphery is closed with a fixed gear or the boss of the hydraulic clutch case to form an oil passage. This solves the problem that the device is difficult to configure.

(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 hydraulic clutch device A is arranged on the cylinder shaft 10,
The outside of the carved grooves 24 and 25 provided on the outer periphery of the cylinder shaft 10 is closed by fitting the fixed gear 5 or the boss part of the hydraulic clutch case 2, and the carved grooves 2
4 and 25 are constructed as oil passages to the hydraulic clutch device A.

(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 sectional view of a clutch housing portion of an agricultural tractor according to the present invention, FIG. 2 is a front 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 front part of the clutch housing 1 is fixed to the engine 40, and the rear part is fixed to the transmission case.

A flywheel 28 is fixed to the rear end of the crankshaft of the engine 40. through a shock absorber device to the flywheel 28,
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 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 running clutch is connected or disconnected by depressing the clutch pedal 41, which causes the bell crank 16 to rotate around the pivot shaft 17 via the link 15, and slide the sliding tube 18 back and forth.

Clutch release bearing 20 on sliding tube 18
The clutch release bearing 20 rotates the arms 30, 30 to connect and disconnect the traveling clutch.

The rotation of the travel clutch is transmitted to the travel drive shaft 10, which is a cylinder shaft, which is the essential part of the present invention, and the rotation of the travel drive shaft 10, which is a cylinder shaft, is transmitted to the fixed gear 5 connected by a key and the hydraulic clutch device. It is transmitted to the hydraulic clutch case 2 of A.

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 a needle bearing 60 provided 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 a traveling transmission shaft 62, and is mounted on a bearing 63.
The outer diameter is supported by a bearing. The bearing 63 is a bearing body 1 fixed to the rear surface of the clutch housing 1.
It is fixed at 2a.

Further, a counter shaft 11 is provided parallel to the travel drive shaft 10, which is a cylinder shaft. counter shaft 11
The front end is supported by a protruding wall 14, and the rear end is supported by a bearing body 12 fixedly protruding from the rear wall of the clutch housing 1.
b is supported by a bearing.

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 always fitted with the fixed gear 4 on the traveling transmission shaft 62.

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, thereby transmitting power.

Then, when the pressure oil is sent, the actuator 7 inside the clutch case 2 is sent rearward with the pressure oil,
The rear end pushes the pressing plate 37 to push the leaf spring 35 back and release the crimped state of the friction plate. 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 a disconnected state, and when pressurized oil is sent, the actuator 8 moves rearward against the spring 65 and brings the friction plate 66 into a crimped state.

The pressure oil passage to the hydraulic clutch device A is from the piping 32 in Fig. 2 through the oil passage 14b, and from the oil passage 22 of the transfer tube provided in the boss portion of the fixed gear 5 in Fig. 1 to the cylinder shaft. Engraved groove 2 on the outer diameter of a certain traveling drive shaft 10
5, the inner diameter oil passage 2 of the rear end boss part of the fixed gear 5
6 and is sent to the friction plate 36 for lubrication. or,
The pressure oil in the piping 33 enters the hydraulic cylinder inside the actuator from the oil passage 14c through the oil passage 23 of the transfer tube and the carved groove 24.

In this way, grooves 25 and 24 are provided on the outer periphery of the traveling drive shaft 10 made of a cylindrical shaft, and the fixed gear 5 and clutch case 2 are fitted onto the grooves to close the upper surface, thereby eliminating the need to make a through hole. It constitutes an oil channel.

Further, the pressure oil of the hydraulic clutch device B enters through the piping 34 shown in FIG. 2, and comes out into the hole inside the bearing cover 21 through the oil passages 14a and 21a. The tip of the counter shaft 11 is fitted into this hole, and the oil is sent to the oil passage 11a inside the counter shaft 11 and enters the hydraulic cylinder between the actuator 8 and the clutch case 3.

Further, as shown in FIG. 2, 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 24 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 communicated 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.

Referring to FIG. 3, the entire hydraulic circuit diagram 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 the front PTO hydraulic control valve 44, connects and disconnects the front wheel drive hydraulic clutch device 56, and then passes through the hydraulic control valve 42 for the hydraulic clutch device for high/low gear shifting. The hydraulic clutch devices A and B, which are the essential parts of the invention, are simultaneously connected and disconnected in reverse, and then the hydraulic control valve 39 for the inertial slip prevention brake is entered to push the hydraulic cylinder 54 for inertia slip prevention.

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.

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

First, in the past, it was not possible to install a hydraulic clutch device on the cylinder shaft because it was not possible to construct a perforated oil passage inside the cylinder shaft. Grooves 25 and 24 were formed on the outer periphery of the cylinder shaft, and the fixed gear 5 and clutch case 2 were fitted over the grooves 25 and 24 to close the oil passages. This makes it possible to place a hydraulic clutch device on top of the vehicle.

Second, when a dual clutch device is installed that separately connects and disconnects the tractor's PTO power and travel power, the PTO drive shaft is placed inside, and the travel drive shaft as a cylindrical shaft is placed outside as a double shaft. However, it is also possible to construct a transmission by fitting a hydraulic clutch device onto the traveling drive shaft inside the clutch housing where such a double shaft is arranged. It has become a reality.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a clutch housing portion of an agricultural tractor according to the present invention, FIG. 2 is a front 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, 2...Hydraulic clutch case, 5...
Fixed gear, 10... Cylindrical shaft (traveling drive shaft), 11...
... Counter shaft, 25 ... Engraved groove, 42 ... Hydraulic control valve for high/low speed change.

Claims (1)

[Claims] 1 A hydraulic clutch device A is arranged on the cylinder shaft 10, and grooves 24 and 25 are formed on the outer circumference of the cylinder shaft 10.
The outside of the fixed gear 5 or hydraulic clutch case 2
A hydraulic clutch type transmission device, characterized in that the boss portion of the hydraulic clutch device A is closed by externally fitting the grooves 24 and 25, and the carved grooves 24 and 25 are configured as oil passages to a hydraulic clutch device A.