JP2003191763A - Power transmission device for driving vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shift a driving vehicle that travels with a power transmission system transmitting via a shuttle idler gear of a shuttle mechanism as a reverse traveling side to a driving vehicle that travels as a forward traveling side. <P>SOLUTION: Power of an engine 2 is transmitted to a rear wheel differential mechanism 5 via the shuttle mechanism 3 and a driving speed change gear mechanism 4, and from this rear wheel differential mechanism 5, the power is transmitted to a rear wheel 7 via an ending speed change gear mechanism 6. The shuttle mechanism 3 sets up a power transmission system that transmits power via the shuttle idler gear 8 on a forward traveling side, and a direct drive position on a backward traveling side. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for a traveling vehicle such as a tractor.

[0002]

2. Description of the Related Art A power transmission device for an agricultural tractor, for example, as shown in FIG. 2, transmits the power of an engine 2 to a shuttle mechanism 3, and the forward power or the reverse power from the shuttle mechanism 3 is used for a traveling speed change mechanism 4. The main transmission means 22, the first auxiliary transmission means 23, and the second auxiliary transmission means 24 shift the speed, and the rear wheel power is transmitted to the rear wheel diff mechanism 5 via the diff transmission shaft 11 from the rear wheel diff mechanism 5. It is transmitted to the rear wheel shaft 19 of the rear wheel 7 via the large reduction gear mechanism 25 and the final speed change mechanism 6, and the power is branched from the differential transmission shaft 11 via the power take-out mechanism 12 to drive the front wheel transmission mechanism 13. The power is transmitted to the front wheels 26 via the front wheels.

The shuttle mechanism 3 has a forward traveling side for transmitting the power transmission system from the buffer mechanism 27 to the propulsive cylinder shaft 28 by direct connection, and a backward traveling side for transmitting power via a back gear group having the shuttle idler gear 8. It can be switched to and. The power takeoff mechanism 12 includes a pair of gears 30,
At 31, the reverse rotation power is transmitted to the input shaft 14 of the front wheel transmission mechanism 13.

[0004]

In the shuttle mechanism 3 of the prior art described above, switching from neutral to the forward traveling side is performed only by connecting / disconnecting the shafts without using the back gear group, and therefore, compared with the backward traveling side. This is advantageous in terms of power loss and damage to the power transmission member. Therefore, when there is a lot of work for frequently switching from neutral to the reverse traveling side, it is disadvantageous. By the way, in the power transmission device shown in FIG. 2, the final speed change mechanism 6 includes the rear wheel transmission shaft 18 on the input side and the wheel shaft 1 on the output side.
The rear wheel idler gear 33 is inserted up to 9 to transmit the normal rotation power.

In order to increase the ground clearance of a traveling vehicle without using a large gear, the distance from the rear wheel transmission shaft 18 to the wheel shaft 19 is increased by inserting an idler gear 33. However, if the rear wheel idler gear 33 is inserted and triangularly arranged with two gears, a very large load is applied to them, and it becomes difficult to obtain the required strength. Therefore, it is desirable to configure with only a pair of (two) gears. There is. Also, if a very high ground clearance is not required, it will consist of only a pair of gears.

However, if the three gears including the rear wheel idler gear 33 are composed of only a pair of gears (two gears),
The rotation direction of the wheel shafts 19 is reversed, so that it becomes necessary to reverse the rear wheel differential mechanism horizontally and redesign the power transmission device. It is an object of the present invention to provide a power transmission device for a traveling vehicle that can solve these various problems. According to the present invention, the power transmission system for transmitting power via the shuttle idler gear is set to the forward traveling side and the direct coupling side is set to the reverse traveling side, so that the power entering the final transmission mechanism can be reversed. An object of the present invention is to provide a power transmission device for a traveling vehicle.

[0007]

The first concrete means for solving the problems in the present invention is to provide the rear wheel differential mechanism 5 with the power of the engine 2 via the shuttle mechanism 3 and the traveling speed change mechanism 4.
Power is transmitted from the rear wheel differential mechanism 5 to the rear wheels 7 via the final transmission mechanism 6, and the shuttle mechanism 3 advances the power transmission system for transmitting power via the shuttle idler gear 8. That is, the direct drive side is set to the traveling side and the direct drive side is set to the reverse traveling side. As a result, the shuttle mechanism 3
The traveling vehicle traveling on the backward traveling side of the power transmission system transmitted via the shuttle idler gear 8 can be easily changed to the traveling vehicle traveling on the forward traveling side.

A second specific means for solving the problems in the present invention is, in addition to the first specific means, a power take-out mechanism 12 from a differential transmission shaft 11 for inputting power to the rear wheel differential mechanism 5. Front wheel power is transmitted to the front wheel transmission mechanism 13 via the power transmission mechanism 12 and the differential transmission shaft 11
That is, a drive idler gear 15 for transmitting the rotation in the same direction to the input shaft 14 of the front wheel transmission mechanism 13 is provided. As a result, the four-wheel drive traveling vehicle that travels on the backward traveling side of the power transmission system that transmits via the shuttle idler gear 8 of the shuttle mechanism 3 is easily changed to the four-wheel drive traveling vehicle that travels on the forward traveling side. .

A third concrete means for solving the problems in the present invention is, in addition to the first or second concrete means, that the final transmission mechanism 6 has a rear wheel transmission shaft 18 on the input side and a wheel on the output side. That is, the reverse rotation power is transmitted to the shaft 19. As a result, the traveling vehicle in which the final transmission mechanism 6 has three gears including the rear wheel idler gear is easily changed to a traveling vehicle in which the final transmission mechanism 6 includes only one pair (two gears).

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a power transmission device for a four-wheel drive agricultural tractor, and the power of the engine 2 is transmitted to a rear wheel differential mechanism 5 via a shuttle mechanism 3 and a traveling speed change mechanism 4, and the rear wheel differential mechanism 5 is transmitted. Power is transmitted from the differential mechanism 5 to the rear wheels 7 via the final reduction gear mechanism 6, and power is input to the rear wheel differential mechanism 5 from the differential transmission shaft 11 to the front wheel transmission mechanism 13 via the power take-out mechanism 12. Is transmitted.

The power of the engine 2 is generated by the PTO propulsion shaft 3
5 is transmitted to the buffer mechanism 27 from the PTO propulsion shaft 35.
Is transmitted to the first gear 36 of the shuttle mechanism 3 via.
The propulsion cylinder shaft 28 is loosely fitted to the PTO propulsion shaft 35. By switching the shuttle clutch 37 provided on the propulsion cylinder shaft 28, the first gear 36 is directly connected to the propulsion cylinder shaft 28. A mode in which transmission from the first gear 36 to the propulsion cylinder shaft 28 is possible via a gear group including the gears 38 and 39, the shuttle idler gear 8, the gear 40, and the like.

Conventionally, the mode in which the first gear 36 is directly connected to the propulsion cylinder shaft 28 is the forward traveling side, and the mode in which the first gear 36 is transmitted to the propulsion cylindrical shaft 28 via the gear group having the shuttle idler gear 8 is the reverse traveling side. However, here, on the contrary,
The direct connection mode is the reverse running side, and the shuttle idler gear 8
The mode having “” is on the forward traveling side. Propulsion cylinder shaft 28
The forward or reverse power transmitted to the main clutches 41, 4
2 through the main transmission means (four-step speed reducer) 22 of the traveling speed change mechanism 4 and the first auxiliary speed change means (super speed reducer)
23 and the second auxiliary speed changer (auxiliary speed reducer) 24, the speed is further changed by four steps and transmitted to the differential transmission shaft 11, and transmitted from the differential transmission shaft 11 to the rear wheel differential mechanism 5 and the power is branched. The front wheel transmission mechanism 13 via the power take-out mechanism 12
The front wheel power can be transmitted to.

The power that has entered the rear wheel differential mechanism 5 is transmitted to the large reduction gear mechanism 25 via the brake mechanism 44, and from this large reduction gear mechanism 25, the rear wheel transmission shaft 18 of the input side of the final transmission mechanism 6 is transmitted.
The deceleration power is transmitted to the rear wheel 7, and the rear wheel shaft 19 of the rear wheel 7 is driven via the pair of gears 45 and 46 of the final transmission mechanism 6 forming the drop axle portion. In the final transmission mechanism 6, the rear wheel idler gear 33 is conventionally interposed between the pair of gears 45 and 46, but here, the pair of gears 45 and 46 are directly meshed with each other so that the rear wheel transmission shaft 18 is moved backward. It is inverted and transmitted to the wheel axle 19.

The power transmitted from the differential transmission shaft 11 to the rear wheel differential mechanism 5 is freely connectable / disconnectable via a four-wheel drive switching clutch 47, and the power branched from the power take-out mechanism 12 is input from the input shaft 14. It is transmitted to the front wheel final reduction means 50 via the front wheel speed reduction means 48 and the front wheel differential mechanism 49 of the front wheel transmission mechanism 13 so that the front axle 51 of the front wheels 26 can be driven. In the prior art, the power take-out mechanism 12 was directly meshed with the gear 31 in which the gear 30 loosely fitted to the differential transmission shaft 11 was attached to the input shaft 14, but here, the drive idler gear 15 is provided between the gears 30 and 31. The power in the same rotation direction as that of the differential transmission shaft 11 is transmitted to the input shaft 14 with the interposition of.

The present invention is not limited to the above embodiment, but can be variously modified. For example,
Shuttle clutch 37, main clutches 40, 41, first,
A hydraulic clutch may be used as the switching clutch of the second auxiliary transmission means 23 and 24, the four-wheel drive switching clutch 47, and the like. The traveling vehicle may be a two-wheel drive dedicated vehicle that does not include the power take-out mechanism 12 and the front wheel transmission mechanism 13. Further, it is preferable that the operation lever for operating the shuttle clutch 37 is provided with a swing fulcrum so that the forward / reverse switching operation direction can be made in the same direction as the conventional one.

When it is desired to use the rear wheel idler gear 33 for the final transmission mechanism 6 after making the forward traveling side and the reverse traveling side of the shuttle mechanism 3 opposite to the conventional ones, the rear wheel differential mechanism 5 is reversed. Then, the large bevel diff gear on the right side of the bevel diff pinion may be arranged on the left side.

[0017]

According to the present invention described in detail above, a traveling vehicle that travels on the backward traveling side of a power transmission system that transmits via the shuttle idler gear 8 of the shuttle mechanism 3 travels on the forward traveling side. Can be easily changed to.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a power transmission device showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a power transmission device of a traveling vehicle that travels with a power transmission system that transmits via a shuttle idler gear of a shuttle mechanism as a backward traveling side.

[Explanation of symbols]

1 power transmission device 2 engine 3 Shuttle mechanism 4 traveling speed change mechanism 5 Rear wheel differential mechanism 6 Final deceleration mechanism 7 rear wheels 8 shuttle idler gear 11 differential transmission shaft 12 Power take-out mechanism 13 Front wheel transmission mechanism 14 Input axis 15 Drive idler gear 18 Rear wheel transmission shaft 19 wheel axle

Claims (3)

[Claims] 1. The engine power is transmitted to a rear wheel differential mechanism via a shuttle mechanism and a traveling speed change mechanism, and the power is transmitted from the rear wheel differential mechanism to the rear wheels via a final speed change mechanism. The mechanism is a power transmission device for a traveling vehicle characterized in that a power transmission system for transmitting power via a shuttle idler gear is set to a forward traveling side and a direct connection side is set to a reverse traveling side. 2. The front wheel power is transmitted from the differential transmission shaft for inputting power to the rear wheel differential mechanism to the front wheel transmission mechanism via the power take-out mechanism, and the rotation of the differential drive shaft is transmitted to the power take-out mechanism. The power transmission device for a traveling vehicle according to claim 1, wherein an idler gear for transmitting rotation in the same direction is provided on an input shaft of the mechanism. 3. The power transmission device for a traveling vehicle according to claim 1, wherein the final transmission mechanism transmits reverse rotation power from an input side rear wheel transmission shaft to an output side wheel shaft. .