JPS63101132A - Electric wheel drive device - Google Patents

Abstract

PURPOSE:To improve maintainability by removably fixing the inner end section of a motor to the inner wall of an axle case via a support tool. CONSTITUTION:An axle case 2 is removably fixed to a vehicle body at a flange section 2a via a means such as bolts. A motor 3 is inserted into the axle case 2 and slidably supported by the axle case 2, and the inner end section and its outer periphery are aligned with an annular recess 7a formed on a support plate 7 and fixed to the support plate 7 via volts 8. A thrust ring 9 is fixed to the outside end face of the axle case 2 using a means such as bolts, and the outer periphery of the outside end section of the motor 3 is supported by the inner periphery of this thrust ring 9 slidably in the axial direction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an electric wheel drive suitable for use in work vehicles such as mining dump trucks! A flash appears on the device.

[Conventional technology]

Conventionally, electric wheel drive devices have been used to drive uphill mine dump trucks, wheel rogue scrapers, y-za, and -ing tractors, and the like.

This electric wheel drive! The device is equipped with a wheel hub with a wheel attached so that it can rotate around the outer circumference of the 7-wheel case, and this wheel hub is placed inside the axle case!
! It is driven by an electric motor.

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 bent outward 7
The axle case 51 is formed in a runny shape, and the axle case 51 is fixed to the vehicle body 50 at the seven-rank base end portion 51b 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 51m so as to be aligned with this inner circumferential surface 51m. The electric motor 11!55 having a tapered outer peripheral surface of the body is connected to the inner peripheral surface 51m of the axle case 51.
It is fitted and installed. The electric motor 55 is fixed to the axle case 51 using a 7.
The ring portion 55m is bolted to the outer end surface of the 7x casing 51.

In this way, the outer circumference of the body of the electric motor 55 and the
1 and the bolt connection between the axle case 51 and the electric motor 55, the durability of the electric W155 mounting portion against vehicle body vibration is ensured. Further, during maintenance, the electric motor 55 and the brake device described below can be disassembled and inspected from outside the vehicle body without removing the axle case 51.

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

In addition, the output shaft 55a and the #1st reduction fi structure 61° 2nd
Each rotating shaft of the next reduction +1W62 is pivotally supported by the axle case 51. In this way, the rotational force of the electric fi 55 is transferred from the output shaft 55a to the primary reduction mechanism 61. Secondary reduction mechanism 62
The speed is appropriately decelerated and transmitted to the wheel hub 57 via.

Furthermore, a brake body 56a is fixed to the outer 'ffIII end face of the electric 1f155 via an adapter ring 54, and a brake body 56a is connected to the second brake body 56a and a disc 56b fixed to the outwardly protruding portion of the output shaft Sob. A mounting w156 is configured.

In addition, other than the conventional method shown in FIG. ! In the fixed type wheel drive device, the electric motor 72 is mounted on the inside of the inner end side (111 body side) of the axle case 71 at 71XL! fi72
A seven-ring portion 72a provided on the outer periphery of the terminal end of the axle case is bolted and fixed to the inner g1 portion 71a of the axle case.

On the other hand, 1st and 2nd order deceleration B! The mechanisms 74 and 75 are disposed at the outer end portion of the axle case 71, and the brake device 117G is disposed further outside the secondary reduction mechanism 75.

And the wheel hub 77 is electric! It is rotatably installed on the outside of the axle case 71 via a hub bearing 73, outward from the mounting position of the gJ iso 72.

[Problem that the invention seeks to solve]

However, the conventional electric wheel drive device shown in FIG. 2 has a reduction gear fl! 61 and 62 are arranged inside the vehicle body of the axle case 51, so if 1!1 deceleration mechanisms 61 and 62 are provided, it is necessary to remove the axle case 51 from the vehicle body 50 after removing the tires, and these The problem is that the work requires a lot of effort and time.

On the other hand, in the conventional electric wheel drive device shown in Fig. 3, the electric 1IIIJ iso 72 is fixed to the axle case 71 by simply tightening its 7 ring part flange 1a with bolts, so the installation is caused by vibrations of the vehicle body. There is a problem in that the bolts may loosen or be damaged.

Furthermore, in the case shown in FIG. 3, the deceleration mechanism 74, 75° brake device 76 can be maintained from the outside without removing the axle case 71, but when servicing the electric fi 72, after removing the tires, There is a problem in that it is necessary to remove the axle case 71 from the vehicle body 70, and these operations require a great deal of time and effort.

Furthermore, in the one shown in FIG. 2, the inner end of the primary reduction mechanism 61 is located closer to the vehicle body than the run surface of the vehicle body attachment 7 of the axle case 51, 71, and the inner end of the electric motor 72 in the one shown in FIG. Therefore, when the axle case is attached to the vehicle body, 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, 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, and by making the electric gh machine and deceleration machine removable from the axle case, the electric motor and deceleration machine can be attached and removed without removing the axle case. Slow down! It is an object of the present invention to provide an electric wheel drive device that allows inspection and maintenance of each part of the device such as a fi structure.

[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 S machine and the wheel hub, and the outer peripheral surface of the electric motor is the outer end of the axle case. The electric motor is slidably supported in the axial direction, and the inner end of the electric motor is removably fixed to the inner wall of the axle case via a support.

[For production]

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 or the like. Further, when inspecting and servicing the device, the electric motor is removed from the inside or outside of the axle case.

〔Example〕

Below, an electric wheel drive as an embodiment of the present invention is shown in the drawings! l! ! ! To explain this, 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 seven-runway portion 2a provided at the inner end thereof by means such as bolts. A support plate 7 serving as a support member has its outer periphery fitted and supported 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 is attached to an annular sheet 7a formed on the same boss plate 7 with an inner end rising and a same end. The outer peripheries are aligned and fixed to the support plate 7 with bolts 8. Further, a thrust ring 9 is fixed to the outer end surface of the axle case 2 using means such as bolts, and the outer periphery of the outer end of the electric motor 8!3 slides on the inner circumferential surface of this thrust ring 9 in the axial direction. It is movably supported.

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

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 13 is connected to the seal cover 1
9 with bolts, and this seal cover 1
It is fixed to the wall of the electric motor 3 via 9. In this way, the sun gear 11. Planetary gear 12. A planetary gear mechanism is constructed from the carrier 14 and the ring gear 13, and this 1n11 wheel mechanism serves as the primary speed reduction mechanism 4.

Further, an annular f1114a is formed at the inner end of the carrier 14, and the annular rIt14m is spline-engaged with the sun gear 15 disposed on the outer periphery of the sun gear shaft 11&. Note that the sun gear 15 is separated from the sun gear shaft 11a, and is connected to the electric fi3! ! The part is fixed.

On the other hand, a carrier 18 of the secondary reduction mechanism 5 is fixed to the outer end surface of the thrust ring 9 using bolts or the like, and a plurality of hydraulic gears 16 are rotatably supported on the carrier 18. The idler gear 16 meshes with the sun gear 15 on its inner periphery and with the ring gear 17 on its outer periphery. Idler gear 16. A planetary gear mechanism is constructed from the ring gear 17 and the V carrier 18, and this '1! The L star gear Isogori has a secondary reduction gear costing $195.

The ring gear 17 is spline-engaged with the inner circumference of the gear case 20, and the inner end surface of the gear case 20 is further provided with a pair of hub bearings 25.on the outer circumference of the axle case 2.
It is fixed to the outer end surface of a wheel hub 26 which is rotatably mounted via a screw 25. As a result, the ring gear 17.
The gear case 20° and the wheel hub 26 can rotate together.

Additionally, a support ring 21 is provided on the outside of the gear case 20.
A brake caliper 24 is provided on the seal cover 19 on the fixed side and can brake the rotation of the wheel hub 26 while contacting the disc plate 23. The caliper 24 constitutes a brake @@22.

Note that a pair of tires 28 are attached to the outer periphery of the wheel hub 26 via a rim 27.

Since the electric wheel drive device as an embodiment of the present invention is configured as described above, in order to drive the tires 28, electric power from a generator (not shown) installed inside the vehicle body 1 is supplied to the electric fi 3. The output of the electric fi3 is supplied to the electric motor 3 through a control device that does not provide m1-order deceleration 8! Structure 4: The signal is transmitted to the wheel hub 26 via the secondary speed reduction mechanism 5 to rotate the tire 28.

In other words, the rotation of the electric fi3 causes the output wheel 1 of the electric motor 3 to
The sun gear 11 of the primary speed reduction mechanism 4 connected to the transmission gear 1 is rotated, and the power transmitted to the sun gear 11 is further 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 12 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 sun gear 15 causes idler gear 16 supported by fixed carrier 18 to rotate, and the rotation of idler gear 16 causes 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 primary reduction mechanism 4 and the secondary reduction mechanism 5
Via Electric I! The rotational force of No. 3 is appropriately decelerated and transmitted to the wheel hub 26. Furthermore, the wheel hub 26
The rotation is through the rim 27! The signal is transmitted to the ear 28.

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 ports 6.8 at the attachment portions thereof are prevented from loosening or being damaged due to vibrations of the vehicle body.

In addition, when installing this device to the vehicle body 1, the electric motor 3. Since none of the brake ft@22 uphill speed reduction mechanism 4 and 5 protrude beyond the inner end of the axle case 2, it can be easily installed without causing contact between each part of the device and the vehicle body 1. This prevents damage to the various parts of the device during operation.

Further, since the axle case 2 can be removed from the vehicle body 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, if you remove the port 6, you can remove the electric fi 3 from inside the axle case 2, or if you remove the port 8, you can remove the electric motor 3.
can be removed from the outside of the axle case 2.

In this way, move the electric motor 1913 inside the axle case 2,
Since either of the outer sides can be removed, 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, together with the electric motor 3, the primary reduction mechanism 4゜secondary reduction mechanism 5 up-brake@f122, etc. can be removed from the axle case 2. Secondary reduction mechanism 5 and brake device i! 22 etc. inspection and GL preparation can be performed, which greatly improves maintainability.

In addition, when the axle case 2 is removed from the vehicle body 1, only the electric motor 3 can be attached to the vehicle body attachment 7 of the axle case 2.
It can be removed to the runno part 2a side or the 7 ring part 2
Since it can be assembled from the & side, maintainability is improved in this respect as well.

〔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 The outer circumferential surface of the motor is comprised of an electric motor provided therein and a speed reduction mechanism provided on the outer end side of the electric motor and interposed between the rotating shaft of the electric motor and the wheel hub. The electric motor is supported by the outer end of the axle case so as to be slidable in the axial direction, and the inner end of the electric motor is removably fixed to the inner wall of the axle case via a support. While ensuring the durability of the mounting part against vehicle body vibration,
It becomes possible to maintain the electric motor, reducer m, etc. without removing the axle case from the single unit, and the effect of improving g-bias is obtained.

Further, when the device is used as a standalone device with the axle case removed from the device, only the electric motor can be removed from the device and reattached, which also has the advantage of greatly improving maintainability.

Furthermore, since the part of the device does not protrude toward the vehicle body mounting 7 run side of the axle case, the work of installing the device on the vehicle body is facilitated, and damage to the device due to contact with the vehicle body during the installation work can be prevented. *Also, when stored, it is possible to stand it upright with the same 7-rank side facing down, which greatly improves 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, and FIGS. 2-3 are side sectional views showing conventional electric wheel drive devices. 1... 11 bodies, 2... 7 Kusuru Keisu % 2 &... 7 ring parts, 3... Electric 1III machine, 4... 1st reduction mechanism (reduction mechanism), 5... 2nd reduction mechanism ( reduction mechanism), 6
... Bolt, 7. Support plate as a support,
8... Bolt, 9... Thrust F ring, 10... Output shaft, 11... Sun gear, l1m... 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, 21...
Support ring, 22...Brake device, 23...Disc plate, 24...Brake caliper, 25--Huff hair ring, No. 26 wheel hub, 27-Fist rim,
28... Tires. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 2 Figure 3

Claims (1)

[Claims] An axle case fixed to the vehicle body, a wheel hub rotatably supported along the outer periphery of the axle case,
The outer circumferential surface of the electric motor includes an electric motor disposed within the axle case, and a speed 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. is slidably supported in the axial direction at the outer end of the axle case, and the inner end of the motor is removably fixed to the inner wall of the axle case via a support. Electric wheel drive device.