JPH01229720A - Drive wheel device for electric driven vehicle - Google Patents

Abstract

PURPOSE:To contrive the improvement of durability, simplification of constitution and facilitation or the like of assembly and disassembly in a seal device by performing with a floating seal a seal between a hollow fixed axle, fixed to a car body side, and a wheel supported to this fixed axle. CONSTITUTION:An electric motor 2 is provided in a fixed axle 1, when the motor 2 is driven, a wheel, not shown, supported to the fixed axle 1 is rotated through a planet type reduction gear 4, pinion 8 and an internal gear 12. In the case of this device, a floating seal 20, comprising a pair of slide contact rings 18a, 18b and a pair of O rings 19a, 19b, is mounted interposing between the end part inside of a cylindrical member 16 engaging the internal gear 12 to be held to a wheel side and the inside of a seal holding member 17 secured to a car body side. In this way, a seal device improves its durability while simplifying constitution further facilitating assembly and disassembly.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a drive wheel device for an electrically driven vehicle such as an electrically driven dump truck in which an electric motor is installed in the drive wheels, and in particular to a fixed center shaft of this drive wheel device. The present invention relates to the structure of a seal portion that seals between the rotary wheel and the rotary wheel.

[Conventional technology]

The drive wheel device of the electrically driven vehicle is as shown in Fig. 2. An electric motor 2 is meshed and supported inside a hollow fixed width shaft 1 fixed to the vehicle body, and the output shaft of this electric motor 2 is 3 is a planetary gear type reducer 4 disposed on the base end side of the fixed axle 1
It is connected to the sun gear 5. A small gear 8 is integrally provided on the shaft 7 of the planetary tooth Iti 6 which meshes with the sun gear 5.

On the other hand, a wheel 10 that supports a tire 9 is supported on the outer periphery of the fixed axle 1 via a bearing 11, and an internal tooth width 12 that meshes with the small gear 8 is provided inside the wheel 10.
is splined and supported by a cylindrical member 13 fixed to the wheel 10.

When the electric motor 2 is driven, the wheel 1
0 is rotated.

A sealing device 14 is provided between the vehicle body side end of the wheel 10 and the base of the fixed axle 1 to prevent dust from entering the inside of the wheel 10. As shown in the figure, a rubber oil seal 15 having a seal lip on the inner surface is fixed.
The cylindrical member 13 that is fitted onto the axle 1 side and fixed to the wheel 10 is fitted inside this oil seal 15, and the outer peripheral surface of this cylindrical member 13 and the seal lip of the oil seal 15 seal the inside and outside of the wheel 10. I was supposed to.

[Problem that the invention seeks to solve]

In the seal device 14, the cylindrical member 1 of the oil seal 15
Since the seal lip that comes into sliding contact with 3 is made of rubber,
This seal lip and the seal mating surface may be severely worn, and the seal device 14 may have to be replaced before overhaul.

Furthermore, in order to facilitate the replacement of the seal device 14 due to the above-mentioned circumstances, the seal and the housing housing the seal may be made separable, but there is a problem in that the structure is complicated.

[Means and effects for solving the problems] The present invention has been made in view of the above-mentioned problems, and can improve the durability of a sealing device interposed between a wheel and a fixed axle. The present invention aims to provide a drive wheel device for an electrically driven vehicle that has a simplified configuration and can be easily disassembled and assembled, and the configuration is as follows:
An electric motor is provided in a hollow fixed axle fixed to the vehicle body, a wheel is supported on the fixed axle, an internal gear is provided inside the end of the wheel on the vehicle body side, and a reduction gear is attached to the internal gear. A drive wheel device for an electrically driven vehicle, in which a pinion gear connected to the output shaft of the electric motor is meshed through the drive wheel device, and a sealing device is interposed between the vehicle body side end of the wheel and the vehicle body,
It has a floating seal structure in which the above sealing device is installed on the inner side of the wheel on the vehicle body side and on the opposite side of the inner side of the wheel on the vehicle body side, and the floating seal is used to seal between the wheel and the vehicle body side. be done.

〔Example〕

An embodiment of the present invention will be described based on FIG.

Note that this FIG. 1 shows only the main part of the present invention.
Further, in this embodiment, the same constituent members as in the conventional example are given the same reference numerals, and the explanation thereof will be omitted.

A pair of sliding rings 18a, 18 are provided on the inner side of the end of the cylindrical member 16 that holds the internal gear 12 to the wheel 10 side through spline engagement, and on the inner side of the seal holding member 17 fixed to the vehicle body side.
b, and a floating seal 20 consisting of a pair of O-rings 19a and 19b is interposed.

In the above configuration, the floating seal 20 provides a seal between the rotating wheel 10 and the fixed axle 1 fixed to the vehicle body. This floating seal 20
is removed by pulling out the wheel 10 from the fixed axle 1.

〔Effect of the invention〕

According to the present invention, since the floating seal 20 seals between the wheel 10 and the fixed shaft 1 fixed to the vehicle body side, the durability of the sealing device 14 in this part can be improved. Furthermore, by configuring the sealing device 14 with the floating seal 20, the configuration of the sealing device 14 is simplified and it can be easily disassembled and assembled.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention, and FIG. 2 is a sectional view showing a drive wheel device for an electrically driven vehicle using a conventional sealing device. 1 is a fixed axle, 2 is an electric motor, 3 is an output shaft, 8 is a small gear,
12 is an internal gear, 14 is a sealing device, and 20 is a floating seal.

Claims (1)

[Claims] An electric motor 2 is provided in a hollow fixed axle 1 fixed to the vehicle body, a wheel 10 is supported on the fixed axle 1, and an internal gear 12 is provided inside the end of the wheel 10 on the vehicle body side. The electric motor 2 is connected to the gear 12 via a reduction gear.
In a drive wheel device for an electrically driven vehicle in which a small gear 8 connected to an output shaft 3 of the wheel meshes with a small gear 8 and a seal device 14 is interposed between the vehicle body side end of the wheel 10 and the vehicle body, the seal device 14 is A drive wheel device for an electrically driven vehicle characterized by having a floating seal structure interposed between the inner side of the end of the wheel 10 on the vehicle body side and the opposing portions of the inner end of the wheel 10 on the vehicle body side.