JPH0610187Y2 - Drive shaft device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a drive shaft device that connects a driving device and a driven device and transmits the power of the former to a rear vehicle. For example, an engine is arranged at the front of a vehicle body. The present invention relates to the structure of a propeller shaft that transmits engine power to a mission case in a tractor with a mission case arranged at the rear.

2. Description of the Related Art In a tractor for agriculture or the like, for example, JP-A-60-11057
As shown in Japanese Patent Publication No. 4, the engine is provided in the front part of the vehicle body and the mission case is provided in the rear part. The output shaft on the engine side and the input shaft on the mission case side are connected by a propeller shaft via universal joints (universal joints), and the engine power is transmitted to the mission case via the propeller shaft.

Since this propeller shaft has universal joints at both ends, it takes a considerably troublesome work to assemble the propeller shaft between the engine and the mission case or remove it for replacement.

SUMMARY OF THE INVENTION Therefore, the present invention provides a driving device (engine) as described above.
And a conventional drive shaft device in which a drive shaft (propeller shaft) that transmits power between a driven device (mission case) is connected to the drive device and the driven device through universal joints, respectively, The present invention intends to enable the drive shaft to be extremely easily assembled between the two devices or to be detached from the two devices while the drive device and the driven device are installed at regular positions.

For this reason, in the present invention, both ends of the drive shaft are slidably fitted and fixed to the corresponding universal joints in the axial direction, and the drive device or the driven device is driven. One of the rotating shafts of the device is axially slidably fitted and fixed to the corresponding universal joint, and is formed between both ends of the drive shaft and the pivots of the universal joints. The sum of the gap lengths is made larger than the fitting length of the rotary shaft with respect to the universal joint.

In this drive shaft device, the drive shaft and the one rotating shaft are slidable with respect to the corresponding universal joints in a state where the drive shaft device is assembled between the drive device and the driven device. When the drive shaft and the universal joint fitted to the rotary shaft are moved in the direction opposite to the rotary shaft until both ends of the drive shaft come into contact with the pivots of the universal joints, the rotary shaft is fitted to the rotary shaft. Since the amount of movement of the universal joints that fit together exceeds the fitting length of the rotary shaft with respect to the universal joint, the connection between the drive shaft device and the rotary shaft is disconnected. In this way, the drive shaft device that has been disconnected from one device (driving device or driven device) can be easily removed from the other device, so that the driving device and the driven device are installed at predetermined positions. In this state, only the drive shaft device can be removed very easily. Further, by the procedure reverse to the above, the drive shaft device can be extremely easily assembled between the drive device and the driven device installed at the predetermined position.

Embodiment Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 1 is an overall side view of a tractor in which the present invention is applied to a propeller shaft. Reference numeral 1 denotes a vehicle body frame, which extends in the front-rear direction in pairs along the left and right sides of the vehicle body, and the rear end is connected to the mission case 2. A pair of rear wheels 3 are pivotally supported on the left and right sides of the mission case 2 via rear axles 4, respectively. A pair of left and right front wheels 6 are pivotally supported at the lower front portion of the body frame 1 via a front axle 5. An engine 7 is mounted on the upper front part of the body frame 1. The crankshaft 8 of the engine 7 extends rearward, and a flywheel 9 is attached to the tip thereof. The flywheel 9 is connected to a propeller shaft 11 via a universal joint 10, and the rear end of the propeller shaft 11 has a universal joint 12
It is connected to the input shaft 13 of the mission case 2 via. Propeller shaft device 14 consisting of universal joint 10, propeller shaft 11 and universal joint 12
Constitutes a drive shaft device according to the present invention for transmitting power from an engine 7 which is a drive device to a transmission case 2 which is a driven device, which will be described in more detail later.

The engine power input to the input shaft 13 is appropriately speed-changed by the speed change device in the transmission case 2 and transmitted to the rear axle 4 to drive the rear wheels 3. The power that has been changed is also applied to the front wheel drive shaft 15 that extends forward from the mission case 2.
And the front wheels 6 are driven via the front axle 5 connected to the front wheel drive shaft 15. Universal joints 16 and 17 are also provided at both ends of the front wheel drive shaft 15, respectively. The transmission case 2 also has a built-in PTO transmission that extracts the power for driving the work machine connected to the tractor from the engine power input to the input shaft 13, and the PTO transmission changes gears by the PTO transmission. Power that was applied is rear P
It is transmitted to the TO shaft 18 and the front PTO shaft 19. A seat 20 is provided above the mission case 2, and a handle 21 is arranged in front of the seat 20, and the front wheel 6 is steered by the handle 21.

FIG. 2 is an enlarged sectional view showing the propeller shaft device 14 and its vicinity in more detail. The flywheel 9 is fixed to the rear end of the crankshaft 8 with bolts 22. As is well known, the universal joint 10 includes a joint member 24 and a joint member 25 that are tiltably connected to each other via a pivot 23. The joint member 24 on the flywheel 9 side is connected to the flywheel 9 by a bolt 26. It is fixed directly. The other joint member 25 is provided with an axial hole 27 in which a spline is engraved on the inner surface,
The front end of the propeller shaft 11 is spline-fitted into the hole 27.

The rear universal joint 17 also includes joint members 29 and 30 that are tiltably connected to each other via a pivot 28, and the front joint member 29 has a similar hole facing the hole 27 of the joint member 25. 31 is bored, and the rear end of the propeller shaft 11 is spline-fitted into the hole 31. Since the propeller shaft 11 is spline-fitted into the holes 27 and 31 in this way, it can be slid in the axial direction with respect to the joint member 25 and the joint member 29, but at the fitting portion between the propeller shaft 11 and the hole 31. The bolt 32 is inserted into the joint member 29 from the lateral direction to prevent the propeller shaft 11 from sliding, and the propeller shaft 11 is fixed at a predetermined position. The other joint member 30 that constitutes the universal joint 17 is also provided with an axial hole 33, and the front end of the input shaft (rotating shaft) 13 of the transmission case 2 is spline-fitted into the hole 33 from the rear side. Bolts 34 similar to bolts 32 above.
Is fixed by.

When the propeller shaft device 14 is arranged between the flywheel 9 and the input shaft 13 as described above, the front end 11a of the propeller shaft 11 and the pivot shaft 23 of the universal joint 10 are arranged.
And a rear end 11b of the propeller shaft 11 and the pivot 28 of the universal joint 17 have gaps having predetermined lengths a and b, respectively, and the input shaft 13 and the hole 33 are fitted together. The combined length, that is, the length between the rear end 30a of the joint member 30 and the front end 13a of the input shaft 13 is set to a predetermined value c. And between these lengths a, b, c, a + b>
The relationship of c is maintained.

In order to remove the propeller shaft device 14 assembled as shown in FIG. 2 between the flywheel 9 and the input shaft 13, first, the bolt 32 is pulled out so that the propeller shaft 11 is attached to the joint member 25 and the joint member 29. The joint member 30 is slidable with respect to the input shaft 13 while being slidable with respect to the bolt 34. Then, when the propeller shaft 11 and the universal joint 17 are moved toward the flywheel 9, the propeller shaft 11 slides along the hole 27 and moves by the distance a until the front end 11a contacts the pivot shaft 23. The universal joint 17 further moves relative to the propeller shaft 11 by a distance b until the rear end 11b of the propeller shaft 11 contacts the pivot 28, and eventually the universal joint 17 moves a + b toward the flywheel 9 side.
As described above, the fitting length c between the joint member 30 and the input shaft 13
Is shorter than a + b, therefore, when the universal joint 17, that is, the joint member 30 is moved by a + b as described above, the front end 13a of the input shaft 13 is moved to the rear end 30a of the joint member 30.
Then, the propeller shaft device 14 and the input shaft 13 are disconnected from each other. Therefore, if the bolts 26 are removed in this state, the entire propeller shaft device 14 can be removed extremely easily from between the flywheel 9 and the input shaft 13, and the engine 7 and the mission case 2 can be left mounted on the vehicle body frame 1. Good. Also, by the procedure reverse to the above, the propeller shaft device 14 can be extremely easily assembled between the engine 7 and the mission case 2 mounted on the vehicle body frame 1, so that the tractor assembling work and the propeller shaft 11 can be performed. Easy and quick replacement work.

Further, in this embodiment, the universal joint 10
Since the one joint member 24 is directly fixed to the flywheel 9 by the bolts 26, the number of parts is reduced and the cost is reduced. Further, by directly connecting the joint member 24 to the flywheel 9, Distance between centers of the universal joints 10 and universal joint 17 is increased, the axis of the propeller shaft 11 with respect to the axis l ₂ axes l ₁ and the input shaft 13 of the crank shaft 8 Since the inclination angle of l ₃ is reduced, the durability of the universal joint 10 and the universal joint 17 is improved, and the noise during operation is reduced.

As described above, the drive shaft device of the present invention is applied to the tractor propeller shaft device.
Although the embodiment applied to No. 14 has been described, the present invention is not limited to this embodiment, and it is needless to say that the present invention can be widely applied to a drive shaft device that generally transmits power between a driving device and a driven device.

As described above, in the present invention, in the drive shaft device in which the drive shaft for transmitting power between the drive device and the driven device is connected to the drive device and the driven device through universal joints, respectively. , Both ends of the drive shaft are slidably fitted and fixed to the corresponding universal joints in the axial direction, and the rotary shaft of either the drive device or the driven device is attached to the corresponding universal joint by an axis line. Direction, the fitting length is slidably fitted and fixed, and the sum of the gap lengths formed between the drive shaft and the pivots of the universal joints at both ends is the fitting length of the rotary shaft to the universal joint. Since it has been made larger, it is extremely easy to install the drive shaft while keeping the drive unit and the driven unit in proper positions. It can be assembled between the devices or detached from both devices, and the work of assembling the whole device and the work of exchanging the drive shaft are simplified and speeded up.

[Brief description of drawings]

FIG. 1 is an overall side view of a tractor in which the present invention is applied to a propeller shaft, and FIG. 2 is an enlarged sectional view showing the vicinity of the propeller shaft of the tractor in more detail. 1 ... Body frame, 2 ... Mission case (driven device), 3 ... Rear wheel, 4 ... Rear axle, 5 ... Front axle, 6
...... Front wheels, 7 …… Engine (drive device), 8 …… Crank shaft, 9 …… Flywheel, 10 …… Universal joint, 11 …… Propeller shaft (drive shaft), 12 …… Universal joint, 13 …… Input shaft (rotary shaft), 14 ... Propeller shaft device (drive shaft device), 15 ... Front wheel drive shaft, 16,17
…… Universal joint, 18 …… Rear PTO shaft, 19…
… Front PTO shaft, 20 …… Seat, 21 …… Handle, 22 ……
Bolts, 23 ... Axis, 24, 25 ... Joint members, 26 ...
… Bolts, 27 …… holes, 28 …… axis, 29,30 …… joint members, 31 …… holes, 32 …… bolts, 33 …… holes, 34 …… bolts.

Claims (1)

[Scope of utility model registration request] 1. A drive shaft device in which a drive shaft for transmitting power between a drive device and a driven device is connected to the drive device and the driven device through universal joints, respectively. Are slidably fitted and fixed to the corresponding universal joints in the axial direction, and the rotary shaft of either the drive device or the driven device can be slidably moved in the corresponding universal joint in the axial direction. It is fitted and fixed, and the sum of the gap lengths formed between the both ends of the drive shaft and the pivots of the universal joints is made larger than the fitting length of the rotary shaft with respect to the universal joint. And drive shaft device.