JPH0513850B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric wheel drive device suitable for use in working vehicles such as mining dump trucks.

[Conventional technology]

Electric wheel drive devices have been used to drive mining dump trucks, wheel loaders, scrapers, dozers, towing tractors, and the like.

In this electric wheel drive device, a wheel hub to which a wheel is attached is rotatably mounted on the outer periphery of an axle case, and the wheel hub is driven by an electric motor installed inside the axle case.

As shown in Fig. 2, electric wheel drive devices include those in which a deceleration mechanism is placed inside the electric motor, that is, on the vehicle body side, and a brake device placed outside the electric motor, and as shown in Fig. 3, There is one in which a deceleration mechanism is disposed outside the deceleration mechanism, and a brake device is further disposed outside the deceleration mechanism.

In the conventional electric wheel drive device shown in FIG. 2, the base end 51b of the axle case 51 is formed in the shape of a flange bent outward.
It is fixed to the vehicle body 50 using bolts or the like.

This axle case 51 has a tapered inner circumferential surface 51a that is slightly opened outward from the center portion to the outer end, and has a similar shape to the inner circumferential surface 51a so as to be aligned with the inner circumferential surface 51a. An electric motor 55 having a tapered outer circumferential surface of the body is fitted onto the inner circumferential surface 51a of the axle case 51. The electric motor 55 is fixed to the axle case 51 by bolting a flange portion 55a provided at the outer end of the electric motor 55 to the outer end surface of the axle case 51.

In this way, the fitting between the outer periphery of the body of the electric motor 55 and the inner periphery of the axle case 51, and the
1. The bolt connection between the two motors 55 ensures the durability of the mounting portion of the motor 55 against vehicle body vibrations. In addition, during maintenance, the electric motor 55 and the brake device described below are removed from the axle case 51.
It is now possible to disassemble and inspect the vehicle from outside without removing it.

Further, a wheel hub 57 is rotatably mounted on the outer periphery of the axle case 51 via a hub bearing 52. The inward protruding portion of the output shaft 55b of the electric motor 55 is connected to the primary speed reduction mechanism 61.
and the wheel hub 5 via the secondary reduction mechanism 62.
7 is connected.

Note that the output shaft 55b and the primary reduction mechanism 6
1. Each rotating shaft of the secondary speed reduction mechanism 62 is pivotally supported by the axle case 51. In this way, the electric motor 5
The rotational force of 5 is transmitted from the output shaft 55b to the primary reduction mechanism 6.
1. The speed is appropriately reduced and transmitted to the wheel hub 57 via the secondary speed reduction mechanism 62.

Further, a brake body 56a is fixed to the outer end surface of the electric motor 55 via an adapter ring 54, and this brake body 56a and an output shaft 55b are connected to each other.
A brake device 56 is constituted by a disk 56b fixed to an outwardly projecting portion of the brake member 56.

Further, in another conventional electric wheel drive device shown in FIG. 3, the electric motor 72 has a flange portion provided on the outer periphery of the outer end of the electric motor 72 inside the inner end side (vehicle body side) of the axle case 71. 72
a is bolted and fixed to the inner wall portion 71a of the axle case.

On the other hand, the primary and secondary reduction mechanisms 74 and 75
is disposed at the outer end portion of the axle case 71, and the brake device 76 is disposed further outward than the secondary speed reduction mechanism 75.

The wheel hub 77 is rotatably mounted on the outside of the axle case 71 via a hub bearing 73 outside the mounting position of the electric motor 72.

[Problem that the invention seeks to solve]

However, the conventional electric wheel drive device shown in FIG.
1 and 62 are arranged inside the vehicle body of the axle case 51, so when servicing the deceleration mechanisms 61 and 62, it is necessary to remove the axle case 51 from the vehicle body 50 after removing the tires, which requires a lot of work. The problem is that it requires a lot of effort and time.

On the other hand, in the conventional electric wheel drive device shown in FIG.
Axle case 7 is only tightened with bolts a.
1, there is a problem that the mounting bolts may loosen or be damaged due to vibrations of the vehicle body.

In addition, the one shown in FIG.
5. Maintenance of the brake device 76 is done using the axle case 7.
1, but when servicing the electric motor 72, it is necessary to remove the tires and then remove the axle case 71 from the vehicle body 70, which requires a great deal of time and effort. There is a problem.

Furthermore, in the one shown in FIG. 2, the inner end of the primary speed reduction mechanism 61 is the inner end of the electric motor 72, and in the one shown in FIG.
Since it protrudes toward the vehicle body from the vehicle body mounting flange surface of 1, when installing the axle case on the vehicle body,
There is a risk that the protruding portion may come into contact with the inside of the vehicle body, causing damage to the protruding portion.

The present invention aims to solve these problems at the same time, and by preventing the device from protruding toward the vehicle body, the device can be easily attached to the vehicle body without damaging the various parts of the device. This is an electric wheel drive that allows the motor and deceleration mechanism to be detached from the axle case, making it possible to inspect and maintain the motor, deceleration mechanism, and other parts of the device without removing the axle case. The purpose is to provide equipment.

[Means for solving problems]

Therefore, the electric wheel drive device of the present invention includes an axle case fixed to the vehicle body, a wheel hub rotatably supported along the outer periphery of the axle case, and an electric motor disposed inside the axle case. , a reduction mechanism is provided on the outer end side of the electric motor and interposed between the rotating shaft of the electric motor and the wheel hub, and the outer peripheral surface of the electric motor is fixed to the outer end surface of the axle case. The electric motor is slidably supported in the axial direction by a thrust ring, and the inner end of the electric motor is removably fixed to the inner wall of the axle case via a support.

[Effect]

In the electric wheel drive device of the present invention, when driving a wheel, the output from the electric motor is transmitted to the wheel hub via the speed reduction mechanism. During this drive, the electric motor is fixedly supported by the support while being supported by the axle case, so that the fixed state is prevented from loosening due to vibrations of the vehicle body and the like. Further, when inspecting and servicing the device, the electric motor is removed from the inside or outside of the axle case.

〔Example〕

Hereinafter, an electric wheel drive device as an embodiment of the present invention will be explained with reference to the drawings.
FIG. 1 is a side sectional view thereof.

As shown in FIG. 1, the axle case 2 is removably fixed to the vehicle body 1 at a flange portion 2a provided on the inner end thereof by means such as bolts. A support plate 7 serving as a support is fitted and supported at its outer periphery by the inner wall of the axle case 2, and is fixed to the inner wall of the axle case 2 with bolts 6.

The electric motor 3 is inserted into the axle case 2 and slidably supported by the axle case 2, and the inner end and the outer periphery of the end are inserted into the annular recess 7a formed in the support plate 7. They are aligned and fixed to the support plate 7 with bolts 8. Additionally, a thrust ring 9 is attached to the outer end surface of the axle case 2 using means such as bolts.
The outer circumference of the outer end of the electric motor 3 is supported on the inner circumferential surface of the thrust ring 9 so as to be slidable in the axial direction.

The output shaft 10 of the electric motor 3 is provided to protrude outward from the vehicle body, and the output shaft 10 is connected to the primary speed reduction mechanism 4.
A sun gear shaft 11a connected to the sun gear shaft 11a is coaxially engaged with the sun gear shaft 11a by spline. A sun gear 11 is attached to the outer end of the sun gear shaft 11a.
A plurality of planetary gears 12 pivotally supported by a carrier 14 mesh with the outer periphery of the gear 1 .

Furthermore, a ring gear 13 having internal teeth that meshes with each planetary gear 12 is provided on the outer periphery of each planetary gear 12 . This ring gear 1
3 is fixed to a seal cover 19 with bolts, and the electric motor 3 is connected through this seal cover 19.
is fixed to the wall. In this way, the sun gear 11, planetary gear 12, carrier 14, and ring gear 13 constitute a planetary gear mechanism, and this planetary gear mechanism serves as the primary reduction gear mechanism 4.

Further, an annular groove 14 is provided at the inner end of the carrier 14.
a is formed, and the annular groove 14a is formed on the sun gear shaft 1.
It is spline engaged with a sun gear 15 disposed on the outer periphery of 1a. Note that the sun gear 15 is separated from the sun gear shaft 11a and is fixed to the wall of the electric motor 3.

On the other hand, a second
A carrier 18 of the secondary reduction mechanism 5 is fixedly installed using bolts or the like, and a plurality of idler gears 16 are rotatably supported on the carrier 18. The idler gear 16 has a sun gear 1 on its inner periphery.
5 and the ring gear 17 on its outer periphery. The sun gear 15, idler gear 16, ring gear 17, and carrier 18 constitute a planetary gear mechanism, and this planetary gear mechanism serves as the second reduction gear mechanism 5.

The ring gear 17 is spline-engaged with the inner periphery of the gear case 20, and the inner end surface of the gear case 20 is further connected to a wheel hub rotatably mounted on the outer periphery of the axle case 2 via a pair of hub bearings 25, 25. It is fixed to the outer end surface of 26. As a result, ring gear 17, gear case 2
0. The wheel hub 26 is designed to be able to rotate as a unit.

Further, a disk plate 23 is fixed to the outside of the gear case 20 via a support ring 21, and a brake carrier that can brake the rotation of the wheel hub 26 while contacting the disk plate 23 is attached to the seal cover 19 on the fixed side. A brake lever 24 is provided, and a brake device 22 is constituted by the disc plate 23 and the brake carrier 24.

Note that a rim 27 is provided on the outer periphery of the wheel hub 26.
A pair of tires 28 are attached via the.

Since the electric wheel drive device as an embodiment of the present invention is configured as described above, when driving the tires 28, the electric motor 3 is powered by a generator (not shown) installed inside the vehicle body 1. Electric power is supplied to the electric motor 3 via a control device (not shown), and the output of the electric motor 3 is transmitted to the wheel hub 2 via the primary reduction mechanism 4 and the secondary reduction mechanism 5.
6 to rotate the tire 28.

That is, as the electric motor 3 rotates, the sun gear 11 of the primary reduction mechanism 4 connected to the output shaft 10 of the electric motor 3 is rotationally driven.
The power transmitted to is transmitted to the planetary gear 12. In response to this power, the planetary gear 12 rotates, and since the gear 12 meshes with the fixed ring gear 13, the planetary gear 1
2 revolves together with the carrier 14. As a result, the sun gear 15 of the secondary reduction mechanism 5, which is spline-engaged with the carrier 14, rotates.

The power transmitted to the sun gear 15 causes an idler gear 16 supported by a fixed carrier 18 to rotate, and the rotation of the idler gear 16 causes the ring gear 17 to rotate. Then, the wheel hub 26 is rotated along the outer periphery of the axle case 2 via the gear case 20 spline-engaged with the ring gear 17.

In this way, the rotational force of the electric motor 3 is appropriately reduced in speed and transmitted to the wheel hub 26 via the first reduction mechanism 4 and the second reduction mechanism 5. Further, the rotation of the wheel hub 26 is transmitted to the tire 28 via the rim 27.

At this time, since both ends of the electric motor 3 are firmly supported by the support plate 7 and the thrust ring 9, the bolts 6 and 8 of the attachment portion thereof are prevented from loosening or being damaged by vibrations of the vehicle body.

In addition, when installing this device to the vehicle body 1, since the electric motor 3, brake device 22, and deceleration mechanisms 4 and 5 do not protrude beyond the inner end of the axle case 2, each part of the device and the vehicle body This can be easily done without incurring contact with the
Damage to various parts of the device during installation is prevented.

Further, since the axle case 2 can be removed from the vehicle body 1 and the device can be placed upright with the inner end of the axle case 2 facing down, this is extremely advantageous when storing the device.

Furthermore, when inspecting and servicing this device, the electric motor 3 can be removed from the inside of the axle case 2 by removing the bolt 6, and the electric motor 3 can be removed from the outside of the axle case 2 by removing the bolt 8. I can do it. In this way, electric motor 3
can be removed from either the inside or outside of the axle case 2, so the electric motor 3 can be inspected and maintained while the axle case 2 is attached to the vehicle body 1, that is, without removing the axle case 2.

In addition to the electric motor 3, a primary reduction mechanism 4,
Since the secondary deceleration mechanism 5, brake device 22, etc. can also be removed from the axle case 2, inspection and maintenance of the primary deceleration mechanism 4, secondary deceleration mechanism 5, brake device 22, etc. can be performed without removing the axle case 2. This greatly improves maintainability.

Furthermore, when the axle case 2 is removed from the vehicle body 1, only the electric motor 3 can be removed from the vehicle body mounting flange 2a side of the axle case 2, or can be assembled from the flange 2a side. Improves maintainability.

〔Effect of the invention〕

As detailed above, according to the electric wheel drive device of the present invention, an axle case fixed to a vehicle body, a wheel hub rotatably supported along the outer periphery of the axle case, and a and a reduction mechanism disposed on the outer end side of the electric motor and interposed between the rotating shaft of the electric motor and the wheel hub, and the outer peripheral surface of the electric motor is connected to the axle case. The motor is slidably supported in the axial direction by a thrust ring fixed to the outer end surface of the motor, and the inner end of the motor is removably fixed to the inner wall of the axle case via a support. While ensuring the durability of the motor mounting portion against vehicle body vibration, it is possible to maintain the electric motor, reduction mechanism, etc. without removing the axle case from the vehicle body, resulting in improved maintainability. In addition, when the device is used alone with the axle case removed from the vehicle body,
It is now possible to remove and reinstall only the electric motor from the device, which also has the advantage of greatly improving maintainability.

Furthermore, since no part of the device protrudes toward the vehicle body mounting flange of the axle case, it is not only easier to attach the device to the vehicle body, but also to prevent damage to the device due to contact with the vehicle body during installation. In addition, during storage, it is possible to stand upright with the flange surface facing down, which has the advantage of greatly improving maintainability.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an electric wheel drive device as an embodiment of the present invention;
FIG. 3 is a side sectional view showing a conventional electric wheel drive device. DESCRIPTION OF SYMBOLS 1... Vehicle body, 2... Axle case, 2a... Flange part, 3... Electric motor, 4... Primary reduction mechanism (reduction mechanism), 5... Secondary reduction mechanism (reduction mechanism), 6... Bolt, 7... Support tool Support plate as 8...
Bolt, 9... Thrust ring, 10... Output shaft, 1
DESCRIPTION OF SYMBOLS 1... Sun gear, 11a... Sun gear shaft, 12... Planetary gear, 13... Ring gear, 14... Carrier, 14a... Annular groove, 15... Sun gear, 16... Idler gear, 17... Ring gear, 18... Carrier, 19... Seal cover, 20... Gear case ,2
1... Support ring, 22... Brake device, 23
...Disc plate, 24...Brake caliper,
25...Hub bearing, 26...Wheel hub, 2
7...Rim, 28...Tire.

Claims (1)

[Claims] 1. An axle case fixed to the vehicle body, a wheel hub rotatably supported along the outer periphery of the axle case, an electric motor disposed inside the axle case, and an electric motor disposed on the outer end side of the electric motor. A speed reduction mechanism is provided between the rotating shaft of the electric motor and the wheel hub, and the outer peripheral surface of the electric motor is slidably supported in the axial direction by a thrust ring fixed to the outer end surface of the axle case. An electric wheel drive device characterized in that an inner end of the electric motor is removably fixed to the inner wall of the axle case via a support.