AC motorized wheel arrangement

CROSS-REFERENCE TO RELATED APPLICATION

The present application is a continuation application of U.S. patent application Ser. No. 08/923,483, filed Sep. 4, 1997, now U.S. Pat. No. 6,148,940, which is hereby incorporated by reference into the present disclosure.

BACKGROUND OF THE INVENTION

The present invention relates to alternating current (AC) driven motorized wheel assemblies that propel and retard off-highway vehicles.

In conventional direct current (DC) motorized wheel assemblies, DC motor rotors use a commutator upon which carbon brushes are held in position with brush holders attached to the motor to maintain a sliding contact and thus allow electrical power to be fed into the rotor for torque production. The brushes and commutator are high maintenance parts of the DC motor and need to be readily accessible for regular replacement and service. Therefore, DC motors are often positioned in the center of the tires with commutators at the outboard end for easy maintenance access to the brushes and removal of the rotor. Since the magnet frame of the DC motor is thick steel, it serves as both the motor frame structure and the wheel frame structure. However, locating the motor in the center of the tire limits the maximum diameter of the rotor and thus puts severe limits on the maximum power capability of the motor.

With conventional DC motors, a hollow cylinder (an axle box) provides a mounting structure for the wheels and serves as an air plenum for cooling air for the wheel motors which originates from remote blowers and exits through the wheels.

SUMMARY OF THE INVENTION

It is therefore seen to be desirable to have a motorized wheel assembly for propelling and retarding off-highway vehicles with lower costs and maintenance requirements. An AC induction motor transfers electrical power to a rotor via electrical induction and therefore needs no commutator or brushes. As compared with a DC motor, an AC motor requires much less maintenance and therefore can be placed in a location where frequent access is not necessary. The cost of the AC motor can be minimized by using a rotor diameter which is as large as possible. In a preferred embodiment of the present invention, AC motors are moved inboard into the axle box where cooling air is available and the diameter of the motor is no longer as restricted. The transmission (which in one embodiment includes a double reduction gear unit) is placed outboard of the tires with a shaft connecting it to the motor allowing the hub diameter and hub bearing diameters to be minimized. Since the limit on motor diameter has been relieved, a higher power capability motorized wheel can be provided with a lower maintenance motor.

With the location of the motors and the transmission in the present invention, air cannot pass through the wheels because the transmission blocks the outlet. Therefore, another method of cooling the motors is needed. The structural integrity of the axle box is very important because the axle box supports two-thirds of the truck's weight and all of the torque reaction. Adding additional air outlet holes or performing any other modifications can affect the structural integrity of the axle box.

In one embodiment of the present invention, air holes are provided in flanges supporting the motor so that cooling air (which enters the axle box from an air inlet duct) can enter the motor from the outboard side and exit the motors into the center of the axle box before being ducted out through an existing service access opening in the rear of the axle box. In this embodiment, the motors can be cooled without adding additional holes to the axle box. Thus, by using the air inlet duct and service access hole in the axle box which already exist for DC motorized wheels, the present invention does not affect the axle box structural design and thus does not create a risk of weakening the structural integrity of the axle box.

BRIEF DESCRIPTION OF THE DRAWINGS

The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself, however, both as to organization and method of operation, together with further objects and advantages thereof, may best be understood by reference to the following description taken in conjunction with the accompanying drawings, where like numerals represent like components, in which:

FIG. 1

is a sectional side view of one embodiment of the present invention.

FIG. 2

is a partial cut out and perspective view of the embodiment of FIG.

1

.

FIGS. 3-6

are respective rear, side, perspective, and top views of a cooling embodiment of the present invention.

FIG. 7

is a side view of a portion of a motor frame having cooling air holes.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

FIG. 1

is a sectional side view of one embodiment of the present invention, and

FIG. 2

is a partial cut out and perspective view of the embodiment of FIG.

1

. An AC motorized wheel arrangement

1

of the present invention includes an AC motor

10

, a transmission

12

, a wheel frame

14

, a wheel hub

16

, and a service brake

18

. The AC motor

10

has a stator

42

with a stator coil

46

, and a rotor

44

with a rotor coil

48

.

FIGS. 1 and 2

illustrate that in the apparatus of the present invention, the outer diameter of the stator coil

46

is at least as large as the innermost diameter of the wheel hub

16

. The service brake

18

has an annular brake disk

19

.

FIGS. 1 and 2

further illustrate that, in the apparatus of the present invention, the inner diameter of the brake disk

19

is at least as great as the innermost diameter of the wheel hub

16

. A truck with which the motorized wheel will be used is shown in block form as element

34

in FIG.

2

.

A single motorized wheel is shown in

FIGS. 1 and 2

. In practice, two motorized wheels are used with the other, unshown motorized wheel substantially similar to a mirror image of that shown in FIG.

1

. For purposes of the present invention, as shown in

FIG. 1

, the term “outboard side” with respect to a motorized wheel, means a portion of the motorized wheel in the direction of the outboard arrow (away from a center line of the truck) and the term “inboard side” refers to a portion of the motorized wheel in the direction of the inboard arrow.

Wheel frame

14

supports the motorized wheel components and includes a flange

20

that can be bolted directly to an axle box

36

of the truck. In one embodiment, a motor frame

15

of the AC motor is mounted with bolts

13

on a portion of the wheel frame on the inboard side of the wheel, and the transmission is mounted to a portion of the wheel frame on the outboard side of the wheel. The wheel frame provides a standard interface to the truck and thus permits easy removal and replacement of the motorized wheel assembly from the truck.

Roller bearings

22

are situated between the wheel frame and the wheel hub for supporting the wheel hub and allowing it to turn on the outside of the wheel frame. The wheel hub is turned by the transmission. Rims

30

and tires

32

are mounted to and rotate with the wheel hub.

The service brake

18

is mounted between the frame flange

20

and wheel hub

16

. This provides two important features: (1) the brake

18

is carried in a protected location between the rotating portion (wheel hub

16

) and the stationary portion (wheel frame

14

) of the wheel and (2) the brake

18

be is positioned for being oil cooled, with the wheel frame

14

geometry in the area of the brake

18

providing an annular reservoir

23

of cooling oil for the brake

18

.

The AC motor converts electrical energy to mechanical energy that turns a shaft

24

connected to the transmission. In one embodiment the transmission comprises a double reduction transmission, and the shaft is connected to a high speed portion

26

of transmission

12

. The high speed portion of the transmission then turns the low-speed portion

28

of the transmission that is bolted to the wheel hub with bolts

27

and

29

through a torque tube

31

.

FIGS. 3-6

are respective rear, side, perspective, and top views of a cooling embodiment of the present invention. As shown in

FIG. 4

, one or more blowers

33

in the front of the truck supply cooling air to axle box

36

through air inlet duct

35

. As shown in

FIGS. 3 and 6

, cooling air from the axle box enters the motors through air holes

21

which are provided in motor frames

15

(which are secured with bolts

13

to flanges

20

of frames

14

of wheels

450

and

452

).

FIG. 7

is a side view of a portion of motor frame

15

with cooling air holes

21

. Air enters the motors from the outboard ends of the motors and passes through motors

10

toward the inboard ends. The motors are attached to an air outlet housing element

410

which directs the air through an opening

425

in the rear of the axle box.

In conventional DC motors, opening

425

is provided for service access to the axle box and is typically covered with a solid cover. In the present invention, the cover can be left off, or, as preferred, a cover

426

may comprise a screen or grid which permits the passage of air.

As shown in

FIGS. 4 and 5

the outlet housing preferably includes a cylindrical portion

414

having two circular openings

412

corresponding to the two motors. The outlet housing can be attached to the motors with any appropriate device. In one embodiment, the motors are bolted to the outlet housing with bolts

423

. The outlet housing can be tapered to provide a smaller air outlet opening

419

which is shown as a rectangular portion

418

. In one embodiment, the outlet housing can be angled in a downward direction. Tilting the outlet housing downwards is useful for preventing debris from falling into the air outlet from the truck body or from the top of the axle box.

The rectangular portion of the outlet housing can be attached to a hose

422

by a housing coupler

420

which can further narrow the available air path, and the hose can be coupled by an axle box coupler

424

to create an opening having the same diameter as the axle box opening. In one embodiment, outlet housing

410

and couplers

420

and

424

comprise sheet steel, hose

422

comprises a flexible air duct hose, and cover

426

comprises steel.

As shown in

FIG. 5

, in one embodiment outlet housing

410

may comprise three portions: two side cowlings

415

and a center wrap portion

417

. This structure provides easy access for bolting the cowlings

415

to the frames of motors

10

. Housing coupler

420

may be secured with bolts

454

to the side cowlings. Center wrap portion

417

may include tabs

429

which fit through loops

421

of the housing coupler to secure the center wrap portion of the outlet housing to the housing coupler.

Although hose

422

and couplers

420

and

424

are shown as having circular cross sections, the present invention does not require a specific shape for the cross sections. Furthermore, the air path does not need to be narrowed in the manner shown in

FIGS. 3-6

.

While only certain preferred features of the invention have been illustrated and described herein, many modifications and changes will occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.