JP3295046B2 - Wheeled vehicle with built-in drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel-type vehicle with a built-in driving device such as a construction vehicle having a bucket device (hydraulic working device) mounted on a front portion thereof.

[0002]

2. Description of the Related Art For example, as a large construction vehicle, an electric or hydraulic drive device is provided between a vehicle body and a plurality of wheels such as two or four wheels, and a bucket device is provided at a front portion of the vehicle body. In addition to being equipped with a hydraulic working device, hydraulic equipment for operating the working device is provided,
Further, a vehicle body is provided with an engine and a generator or a hydraulic pump driven by the engine.

[0003]

However, according to the above-mentioned conventional structure, a plurality of wheels having a built-in electric or hydraulic drive unit are floated because the respective drive units are separately controlled. If the vehicle slips or slips, the wheels slip or run at high speed, and there is a problem that the driving force (including the braking force) of the driving device corresponding to the wheels cannot be exhibited (effectively used).

Accordingly, an object of the present invention is to provide a vehicle with a built-in drive unit capable of distributing the driving force of a wheel drive unit corresponding to a wheel that has floated or slipped to another wheel. It is intended.

[0005]

In order to achieve the above-mentioned object, according to the present invention, there is provided a wheeled vehicle with a built-in drive unit, wherein a plurality of pairs of right and left wheels are provided on the vehicle body side. A wheel drive device is provided between at least one pair of left and right wheels and the vehicle body side, and a drive source of the wheel drive device is disposed on the vehicle body, and the wheels of the left and right pair wheels in each set are provided. each of the inter-axle differential unit is interposed, in which is characterized in that between the differential case rotating take-off shaft is connected through a shaft in the differential gear which face before and after.

Therefore, according to the first aspect of the present invention, the wheels can be driven and rotated by driving the wheel driving device by the driving source. When running, one or more of the wheels float or slip, resulting in a load (frictional resistance).
When high-speed rotation (idling) is performed in a state where there is no (less), in the differential device, of the pair of left and right wheel shafts, the other side performs higher-speed rotation than the rotation of one side, and the rotation speed The difference works to slow down one side. However, the wheel drive device has a characteristic of generating high torque at low speed, and works to suppress high-speed rotation of the other side. Further, when a rotational speed difference occurs between the rotation take-out shafts of the front and rear differential devices, the driving force is transmitted by the shaft between the two rotation take-out shafts.

That is, when one of the wheels floats or slips and the load (frictional resistance) is reduced, the torque of all the wheel driving devices can be used for the remaining wheels. The driving force of the wheel drive corresponding to the wheel that has floated or slipped can be distributed to another wheel.

According to a second aspect of the present invention, there is provided a wheeled vehicle with a built-in drive unit, wherein
The wheel drive device is of an electric drive type, and is characterized in that the drive source comprises an engine and a generator.

Therefore, according to the invention of claim 2, power can be generated by operating the generator by driving the engine,
The electric power can be supplied to an electrically driven wheel drive device to drive and rotate the wheels.

According to a third aspect of the present invention, there is provided a wheel-type vehicle with a built-in drive unit, wherein the wheel drive unit is a hydraulic drive type and the drive source comprises a hydraulic pressure generation device. It is a characteristic.

Therefore, according to the third aspect of the present invention, the wheel pressure can be supplied to the hydraulically driven wheel driving device to drive and rotate the wheel.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. A vehicle body 2 of an electric drive type construction vehicle 1 which is an example of a wheel drive type vehicle has a front body portion 2A provided with a pair of left and right front wheels 3 and a rear body portion 2B provided with a pair of left and right rear wheels 4. Consists of The two body parts 2A, 2B are relatively rotatably connected by a vertical connection shaft 5 that is divided up and down, and a pair of left and right steering cylinders 6 is disposed between the two body parts 2A, 2B. .

An operating section 7 having a seat, various levers, and the like is provided above the front end of the rear body section 2B. A pair of left and right booms 8 are disposed in front of the driving section 7 in the front body section 2A.
A is attached to a bracket 9 provided on the upper rear end of the A through a support shaft 10 in the left-right direction, and is configured to be vertically swingable. A cargo handling cylinder 11 for vertically swinging the boom 8 is provided between the front vehicle body 2A and the boom 8.

A bucket device 13 is mounted between the free ends of both booms 8 via horizontal pins 12 in the left-right direction.
A second link 16 is connected to a free end of a first link 15 attached to the boom 8 via a pin 14 by a pin 17, and the free end of the second link 16 is connected to the bucket device 13.
And are connected by a pin 18. The first link 1
A bucket cylinder 19 for rotating the bucket device 13 around the horizontal pin 12 is provided between the base end of the boom 5 and the boom 8.

An oil tank 20 is provided on the front vehicle body 2A, and a pump driving device 21 is disposed on the rear upper portion of the oil tank 20. The pump driving device 21
A main pump 22 for a working device and a steering pump 23 are provided. A main valve 24 is provided on the upper front side of the oil tank 20, and a steering valve 25 is provided on the upper rear side of the front vehicle body 2A. These valves 24 and 25 are controlled by lever operation of the operating unit 7. Is done.

A generator 26, a generator 27, an engine 28, and the like are arranged in the rear body portion 2B in this order from the front to the rear. Then, a drive shaft 29 from the engine 28 is inserted into the generator 27 and the generator 26 so that the generator 26 is driven by the drive shaft 29. Constitutes an example of the driving source.

Further, a propeller shaft 30 is disposed between the front vehicle body portion 2A and the rear vehicle body portion 2B, a rear end of the propeller shaft 30 is connected to the drive shaft 29, and a front end is connected to the pump driving device. 21 shafts. That is, the drive shaft 29 of the engine 28 drives the generator 26 and drives the main pump 22 of the hydraulic device.

An electric drive unit (one example of a wheel drive unit) 31 is provided between the vehicle body 2 and each of the wheels 3 and 4. That is, the attachment of the front wheels 3 to the front body portion 2A and the attachment of the rear wheels 4 to the rear body portion 2B are performed via the electric drive device 31 having the same configuration. Here, the electric drive device 31 is configured by an electric motor (electric motor) 32 provided on the front body portion 2A side or the rear body portion 2B side, a brake-equipped speed reducer 33 provided on the front wheel 3 side or the rear wheel 4 side, and the like. Is done.

The front wheel 3 and the rear wheel 4 are left and right pairs,
Two pairs of front and rear wheels are provided by a pair of front wheels 3 and a pair of rear wheels 4. In each pair, a wheel shaft 34 protruding inward from both electric motors 32 in the electric drive device 31.
A front differential device (differential device) 40A and a rear differential device 40B are interposed therebetween.

That is, both differential devices 40A,
Reference numeral 40B denotes a differential case 41, a pair of pinion gears 43 rotatably supported by the differential case 41 via a splitter 42, and meshed with the pinion gears 43 at the same time, and the differential case 41 is connected to the differential case 41 via an axle shaft 44. A pair of side gears 45 rotatably supported, and these side gears 45
A ring gear 46 fixed to the differential case 41 as the same axis as the above, and a pinion 47 meshed with the ring gear 46 are provided. The two axle shafts 44 are connected to the corresponding drive shafts 34 via appropriate connecting means.

The shaft on which the pinion 47 is provided is a rotation take-out shaft 48 of the differential case 41. The two differential devices 40 are disposed so as to be relatively displaced by 180 degrees in the left-right direction. It is stretched to the opposite side. The rotation take-out shafts 48 are connected via a propeller shaft (an example of a shaft) 38.

The operation of the above embodiment will be described below. When the engine 28 is driven, its drive shaft 2
The electric power can be generated by operating the generator 26 via the power supply 9, and the electric power can be supplied to the electric motor 32 of the electric drive device 31 to drive the electric motor 32. Then, by controlling the current to the electric motor 32 by operating the lever in the driving unit 7 and controlling the rotation of the electric motor 32 (forward rotation, reverse rotation, stop), the wheels 3 and 4 are forcibly driven forward or reverse. Thus, the construction vehicle 1 can travel forward or backward. Further, the construction vehicle 1 can be stopped by applying the brake of the brake-equipped reduction gear 33.

By driving the engine 28, the drive shaft 2
The pump drive 21 is also activated via a propeller shaft 30 connected to the pump drive 9 and the pump drive 2
1, the large capacity main pump 22 and steering pump 23 are operated.

Therefore, by controlling the steering valve 25 by operating the lever in the driving section 7, etc.,
The pair of left and right steering cylinders 6 can be reversibly extended and contracted by the hydraulic pressure from the steering pump 23, so that the construction vehicle 1 can turn left and right. Further, by controlling the main valve 24 by lever operation or the like in the operating unit 7, the cargo handling cylinder 11 and the bucket cylinder 19 can be expanded and contracted by the hydraulic pressure from the main pump 22, and the boom 8 and the bucket device 13 are operated. And perform the intended work.

In this way, the traveling of the construction vehicle 1 and the operation of the bucket device 13 can be performed. At this time, during normal traveling, the wheel shafts 34 of the respective electric driving devices 31
That is, since all the axle shafts 44 in both the differential devices 40A, 40B are rotated in the same direction at the same rotational speed, the pinion gear 43 does not rotate as shown in FIG.
The propeller shaft 40B and the propeller shaft 38 are idled without transmitting a driving force to each other, so that the mechanical efficiency is high (large).

Also, when one of the four wheels floats during traveling, for example, when the left front wheel 3 floats, the left front wheel 3 has no load (frictional resistance), so it rotates at high speed. try to. That is, as shown in FIG. 3, the front left axle shaft 44 of the front differential device 40A is rotated by the rotation a of the right front axle shaft 44.
In this case, the high-speed rotation A is performed, and the pinion gear 43 is rotated by the difference in the number of rotations to try to rotate the front right axle shaft 44 at a low speed. This serves to suppress the left front wheel 3 from rotating at high speed.

Further, a front differential device 40A
And a rotational speed difference between the rotational speed of the rotary take-out shaft 48 in the rear differential device 40B and the rotational speed of the rotary take-out shaft 48 in the rear differential device 40B. Then, the pinion gear 43 of the rear differential device 40B is rotated at an increased speed, so that the driving force of the right front wheel 3 is distributed to the remaining three wheels, and the remaining three wheels are rotated at the increased speed a + α.
Will be.

That is, when any one or more of the wheels 3 and 4 floats or the load (frictional resistance) is reduced, the remaining wheels 3 and 4 are turned off.
On the other hand, the torque of the four electric motors 32 can be used, and the driving force of the electric drive device 31 corresponding to the floating wheel can be effectively distributed to another wheel.

Hereinafter, another embodiment of the present invention will be described with reference to FIG. That is, the vehicle body 2 side and each wheel 3, 4
Hydraulic drive device (an example of a wheel drive device)
50 are provided. The hydraulic drive device 50 includes a hydraulic motor 51 and a speed reducer 52 with a brake. In this case, the driving source is constituted by a hydraulic pump (an example of a hydraulic pressure generating device) 51 or the like.

In both of the above-described embodiments, the case where the wheels 3 and 4 are floating and there is no load (frictional resistance) and the high-speed rotation is performed has been described. The same applies to the case where the wheels 3 and 4 that have slipped and perform high-speed rotation with a small load (frictional resistance).

In the above embodiment, the pair of front wheels 3
The electric drive device 31 and the hydraulic drive device 50 are arranged on all of the pair of rear wheels 4 and the electric drive device 40 and the hydraulic drive device 5 only on the pair of front wheels 3.
0 may be provided, or the electric drive device 40 or the hydraulic drive device 50 may be provided only on the pair of rear wheels 4.

In both of the above-described embodiments, the construction vehicle 1 having a pair of front wheels 3 and a pair of rear wheels 4 is shown. The traveling carriage type may be used.

In the above embodiment, the vehicle body 2 is
Although a divided form composed of a front body part 2A and a rear body part 2B is shown, this may be an integrated body. In the above-described embodiment, a wheeled vehicle with a built-in driving device equipped with the bucket device 13 is shown as a hydraulic working device, but this is a driving device equipped with a clamping device, a lift device, or the like as a working device. It may be a vehicle with a built-in wheel.

[0034]

According to the first aspect of the present invention, the wheels can be driven and rotated by driving the wheel driving device by the driving source. When running, high-speed rotation (idling) without any (small) load (frictional resistance) with one or more wheels floating or slipping, in a differential device, Of the pair of left and right wheel shafts, the other side rotates at a higher speed than the rotation of one side, and the difference in the number of rotations works to decelerate one side, but in this case, the wheel drive device is operated at low speed It has a characteristic of generating high torque, and works to suppress high-speed rotation of the other side. Further, when there is a difference in the number of rotations between the rotation extraction shafts of the front and rear differential devices, the driving force can be transmitted by the shaft between the two rotation extraction shafts.

That is, when one of the wheels floats or slips and the load (frictional resistance) is reduced, the torque of all the wheel driving devices can be used for the remaining wheels, and the wheel is lifted. The driving force of the wheel drive device corresponding to the wheel that has slipped or slipped can be effectively distributed to another wheel,
Thus, the driving forces of all the wheel drive devices can be fully utilized (effectively used), and the effect of non-slip differential can be expected.

When a difference between the inner and outer wheels is required during turning, a smooth turning is possible by controlling the wheel drive device (electric motor or hydraulic motor, etc.) in advance so as to rotate with a difference in the number of revolutions. It can be.

According to the second aspect of the present invention,
Electric power can be generated by driving the generator by driving the engine, and the electric power can be supplied to the electric driving device to drive and rotate the wheels.

According to the third aspect of the present invention, the hydraulic pressure generated by the hydraulic pressure generating device is supplied to the hydraulically driven wheel driving device to drive and rotate the wheels.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention, and is a plan view of a wheel-equipped vehicle with a built-in drive device in a state where wheels are arranged.

FIG. 2 is an explanatory diagram of a differential device portion during normal running of the vehicle with a built-in drive device.

FIG. 3 is an explanatory view of a differential device portion when the vehicle with a built-in drive device floats and travels.

FIG. 4 is a side view of the vehicle with a built-in drive device.

FIG. 5 is a plan view of the vehicle with a built-in drive device.

FIG. 6 is a side view of a vehicle body portion of the vehicle with a built-in drive device.

FIG. 7 shows another embodiment of the present invention and is a plan view of a wheel-arranged vehicle with a built-in drive device in a state where wheels are provided.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Construction vehicle (wheel drive type vehicle) 2 Body 3 Front wheel 4 Rear wheel 5 Vertical connection shaft 7 Operating part 8 Boom 11 Loading cylinder 13 Bucket device 21 Pump drive device 26 Generator (drive source) 28 Engine (drive source) 29 Drive shaft 31 Electric drive device (wheel drive device) 32 Electric motor 33 Reducer with brake 34 Wheel shaft 38 Propeller shaft (shaft) 40A Front differential device 40B Rear differential device 41 Differential case 42 Splitter 43 Pinion gear 44 Axle shaft 45 Side gear 46 Ring gear 47 Pinion 48 Rotary take-out shaft 50 Hydraulic drive (wheel drive) 51 Hydraulic motor 52 Reducer with brake 53 Hydraulic pump (drive source)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-172705 (JP, A) JP-A 63-54520 (JP, U) JP-A 62-112616 (JP, U) JP-A 60-116 56842 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60K 17/04 B60K 6/02 B60K 7/00 B60L 11/12

Claims (3)

(57) [Claims] A plurality of pairs of left and right wheels are provided on the vehicle body side in front and rear, and a wheel driving device is provided between at least one pair of left and right wheels and the vehicle body side. A drive source of the drive device is provided, and a differential device is interposed between the wheel shafts of the pair of left and right wheels in each set , and a shaft between the rotation take-out shafts of the differential case of the differential device facing front and rear is provided via a shaft. A wheeled vehicle with a built-in drive unit, which is connected. 2. The vehicle with a built-in drive device according to claim 1, wherein the wheel drive device is an electric drive type, and the drive source comprises an engine and a generator. 3. The vehicle with a built-in drive device according to claim 1, wherein the wheel drive device is a hydraulic drive type, and the drive source is a hydraulic pressure generation device.