JPH0626931B2 - Electric wheel drive device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric wheel drive device applied to, for example, a mining dump truck, a wheel loader, a scraper, a dozer, a towing tractor, and the like.

[Prior Art] A conventional electric wheel drive device has a sixth
As shown in the figure, the speed reducer 61 is provided on the vehicle body center side of the electric motor 53.
The brake device 54 on the outside of the vehicle body of the electric motor 53.
And a planetary-type first stage speed reducer 81 is disposed on the outer side of the electric motor 73 as shown in FIG.
Further, there is one in which a star type second stage speed reducer 82 is arranged outside thereof. The planetary type first stage reduction gear 81 of FIG. 7 is located at a position inside the vehicle bearing outer end portion of the hub bearing.

[Problems to be Solved by the Invention] In the one shown in FIG. 6, an electric motor 53 is arranged in an axle case 52 attached to a vehicle body 51, and the power from the electric motor 53 is used as a primary reduction gear 61, The secondary speed reducer 62 decelerates and transmits the rotation to the tire 63. However, since the primary speed reducer 61 is a normal external gear and the secondary speed reducer 62 is a normal internal gear. However, there has been a limit in a limited space to greatly reduce the rotational power of the electric motor 53 and transmit the power of low rotation and high torque to the tire 63.

In addition, as shown in FIG. 7, an electric motor 73 is arranged on the innermost side of an axle case 72 attached to a vehicle body 71, and a planetary type primary reduction gear is arranged outside the electric vehicle 73 in the N direction outside the vehicle body and inside the hub bearing. 81 is arranged, and a star type secondary reduction gear 82 is arranged on the outside thereof to transmit the power of the electric motor 73 to the tire 83. In this structure, the deceleration of the planetary type primary reduction gear 81 The ratio was determined by the diameter of the hub bearing, and it was difficult to obtain a large reduction ratio.

Therefore, the present invention has, for example, as an electric wheel drive device for large vehicles, has a structure in which the reduction gear ratio of the reduction gear can be made sufficiently large in accordance with the increase in the speed of the motor, and the reduction gear and the braking device can be maintained and maintained. An object is to provide an easy electric wheel drive device.

[Means for Solving Problems] In order to solve the above problems and achieve the object, the device of the present invention is configured as follows.

An electric motor is arranged in an axle case attached to the vehicle body, and the power from the electric motor is used to drive the first speed reducer and the second speed reducer.
An electric wheel drive device provided so as to be decelerated by a secondary speed reducer and transmitted to a tire mounted on the outer circumference of an axle case through a hub bearing, wherein the hub outside of the hub bearing at the output shaft of the electric motor is outside the vehicle body. For the area protruding to the side, the planetary type 1st
The secondary speed reducer is located outside the vehicle body and the star type secondary speed reducer is located inside the vehicle body, and the braking device is the planetary type primary speed reducer and the star. It is characterized in that it is arranged in the outer peripheral area of the expression secondary speed reducer.

[Operation] By taking such means, the following operation occurs. The diameter of the gear case is not limited by the diameter of the hub bearing, and it is possible to use up to the maximum diameter of the axle case.
It is possible to increase the reduction ratio by the secondary reduction gear.
As a result, the electric motor can be rotated at high speed, and the efficiency can be improved. Furthermore, the first reduction gear, the second
It is possible to disassemble and assemble the secondary reducer and the brake device at the end of the axle case on the outer side of the vehicle body. Therefore, workability during disassembly and assembly work is improved, and maintenance is facilitated.

[Embodiment] FIGS. 1 to 4 are views showing an embodiment of the present invention. FIG. 1 is a sectional view of an electric wheel drive device, and FIG.
1 is a sectional view taken along the line FF of FIG. 1, FIG. 3 is a perspective view of a single gear case, and FIG. 4 is a side view. As shown in FIG. 1, the inner peripheral surface 6 of the axle case 2 attached to the vehicle body 1
First, the electric motor 3 is arranged so as to be coaxial with the hub bear rigs 4 and 5 installed on the outer peripheral portion of the axle case 2. Then, a flange 8 extending from the electric motor 3 is attached to and supported by the end surface 7 of the axle case 2.

The pinion shaft 11 of the planetary primary speed reducer 10 is detachably connected to the rotating shaft 9 of the electric motor 3 via a collar 12 having a spline on the inner peripheral surface thereof.
Power is transmitted from the rotating shaft 9 to the pinion shaft 11. The rotating shaft 9 and the pinion shaft 11 form an output shaft.

Pinion gear 11 formed on the pinion shaft 11
The rotation from a is transmitted to the pinion gear 17a of the star type secondary reduction gear 17 by the planetary carrier 16 via the fixed ring gear 14 and the planetary gear 15. The pinion gear 17a has a hollow structure so that the pinion shaft 11 penetrates.

The rotation of the pinion gear 17a is transmitted to the ring gear 19 via the idler gear 18 which is fixedly supported.

The outer circumference of the ring gear 19 is supported by the gear case 20 by spline engagement, and the rotation from the ring gear 19 is transmitted to the tire 22 via the gear case 20 and the hub wheel case 21.

Both the primary reduction gear 10 and the secondary reduction gear 17 are located on the outer side of the vehicle body with respect to the hub bearings 4 and 5. In addition, the disc plate 23 is meshed with the spline on the inner side of the vehicle body of the pinion gear 17a, the brake fixing ring 24 attached to the ring gear housing is fixed, and the disc plate 26 is attached to the inner peripheral surface of the brake fixing ring 24 by the spline 25. I'm in mesh.

When the oil flows into the chamber 27, the piston 2
8 acts on the side of the disc plate 26, and the friction between the disc plates 23, 26 causes a braking action.

FIG. 5 is a sectional view showing another embodiment of the present invention. 41
Is a vehicle body, 42 is an axle case, and 43 is an electric motor.
With such a structure, the object of the present invention can be achieved as in the case of the above embodiment.

[Effects of the Invention] According to the present invention, the following operational effects are achieved. The diameter of the gear case does not have to be limited by the diameter of the hub bearing, and the maximum diameter of the axle case can be used. Therefore, it is possible to increase the reduction ratio by the primary reducer and secondary reducer. Becomes As a result, the electric motor can be rotated at a high speed, and the efficiency can be improved. Further, the first speed reducer, the second speed reducer, and the brake device can be disassembled and assembled at the end of the axle case on the outer side of the vehicle body. Therefore, disassembly,
Workability during assembly work is improved, and maintenance is facilitated.

[Brief description of drawings]

1 to 4 are views showing an embodiment of the present invention, and FIG. 1 is a sectional view of an electric wheel drive device, and FIG.
1 is a sectional view taken along the line FF of FIG. 1, FIG. 3 is a perspective view of a single gear case, and FIG. 4 is a side view. FIG. 5 is a sectional view of an electric wheel drive device as another embodiment of the present invention. 6 and 7 are cross-sectional views showing different examples of conventional electric wheel drive devices. 1 ... Body, 2 ... Axle case, 3 ... Electric motor,
4, 5 ... Hub bearing, 10 ... First reduction gear 10,
11 …… Pinion shaft, 14 …… Fixed ring gear, 15 …… Planetary gear, 17 …… Secondary reduction gear pinion gear, 18 …… Idler gear, 19 ……
Link gear, 20 ... Gear case, 21 ... Hub wheel case, 22 ... Tire.

Claims (1)

[Claims] 1. An electric motor is arranged in an axle case attached to a vehicle body, and the power from the electric motor is decelerated by a primary reduction gear and a secondary reduction gear to pass through a hub bearing around the outer circumference of the axle case. In an electric wheel drive device provided so as to be transmitted to a mounted tire, a planetary type first device is provided for a region of an output shaft of the electric motor projecting outward from the hub bearing.
The secondary speed reducer is located outside the vehicle body and the star type secondary speed reducer is located inside the vehicle body, and the braking device is the planetary type primary speed reducer and the star. An electric wheel drive device, characterized in that the electric wheel drive device is arranged in an outer peripheral region of a secondary speed reducer.