JPS5936501Y2 - vehicle front wheel drive - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a front wheel drive device for a vehicle such as a tractor or an automobile.

Particularly in vehicles that are required to run at low speeds, it is desirable to make the external size of the drive device as small as possible while increasing the reduction ratio as much as possible even in the front wheel drive portion.

Therefore, in this invention, in a front wheel drive device that increases the reduction ratio by combining a bevel gear mechanism provided to drive the rotation center axis and a planetary motion reduction mechanism, we have proposed The front wheel axle, which is positioned so as to are configured to be on the left and right sides of the planetary gear, the reduction ratio is large and the drive device is small, and the front wheel axle can be firmly supported without wobbling on the left and right sides of the planetary gear where the drive rotational force acts. In order to facilitate assembly work and simplify the shaping and manufacturing of the outer gear case, a shaft support separate from the outer gear case is used to support the inner side of the front wheel shaft.

To explain one embodiment, although the figure shows only the front wheel drive device on the right side, a cylindrical lower journal boss 2a is provided at the outer end of the front axle housing 1 in which the front wheel drive shaft 3 is housed. Install the inner gear case 2 with
An outer gear case 5 is formed which includes a gear chamber 5a opening outward, an upper journal hole 5b, and a lower journal hole 5C. Journal'JL
5b, and the lower journal hole 5C is rotatably fitted into the lower journal boss 2a, respectively, and the rotation center shaft 9 with bevel gears 7 and 8 fitted into the upper and lower parts, respectively, is connected to the upper journal boss 6a and the lower journal. The outer side of the front wheel drive shaft 3, which is supported by the bearing 4, is supported by the inner gear case 2 and the outer gear case 5 by the bearing 11 through the bevel gear 7, while aligning with the cylindrical center of the boss 2a. The bevel gear 12 attached to the upper bevel gear 7
It meshes with the upper bevel gear mechanism.

Further, the bolts 24 are inserted so that the ring-shaped internal gear 23 is sandwiched between the outer end of the outer gear case 5 and the outer cover 22.
The sun gear shaft 18, on which the sun gear 19 is fitted, has its inner part connected to the inner wall 5d of the outer gear case 5 with a bearing 16, and its outer part connected to the inner wall 5d of the outer gear case 5 with a bearing 15. A large-diameter bevel gear 17 supported by a cylindrical front wheel shaft 14 and formed inside a sun gear shaft 18 is meshed with a lower bevel gear 8 of a rotation center shaft 9 to form a lower bevel gear mechanism.

Then, while fitting the inner hole 20a of the shaft support 20 onto the sun gear shaft 18, the shaft support 20 is joined to the seat 5e provided in the gear chamber 5a of the outer gear case 5, and the shaft is secured with the bolt 29. The support body 20 is attached to the seat 5e, and the hollow shaft portion 14 of the front wheel axle 14 is
a on the outside of the sun gear shaft 18, and this hollow shaft portion 14a
has an inner side supported by a shaft supporting body 20 via a bearing 21, and an outer side supported by a bearing 25 to an outer cover 22. At this time, the bearings 21 and 25 are connected to the left and right sides of a planetary gear 27, which will be described later. It is determined that it will be located at

A carrier 26 is spline-fitted to the hollow shaft portion 14a, and planetary gears 27 are rotatably supported at several locations on the outer circumference of the carrier 26 via pins 28, so that the front wheel shaft 14 can be rotated as described above. When the sun gear shaft 18 is externally fitted and supported, each planet gear 27 is connected to the sun gear 19 through the notch holes 14 b provided at several locations in the hollow shaft portion 14 a.
are in mesh with each other, and at the same time, these planetary gears 27
A planetary motion reduction mechanism that also meshes with the internal gear 23 is formed.

Therefore, if the knuckle arm (not shown) attached to the outer gear case 5 is rotated by the steering mechanism, the outer gear case 5 and the front wheel shaft are rotated around the upper journal boss 6a, the lower journal boss 2a, and the rotation center axis 9. 14
When the front wheel 13 attached to this rotates and the front wheel drive shaft 3 is driven by a front wheel differential gear mechanism (not shown), the The sun gear shaft 18 is driven,
The carrier 26 drives the front wheels 13 at a speed greater than that of the sun gear shaft 18.

This invention is based on a front wheel drive system in which a bevel gear mechanism provided to drive the turning center shaft 9 and a planetary motion reduction mechanism are combined to increase the reduction ratio. The front wheel axle 14, which is positioned so as to Since the above-mentioned shaft support positions are on the left and right of the planetary gears 27, the front wheel shaft 14 can be firmly supported on both the left and right sides without wobbling. 2
Since the front wheel shaft 14 is pivotally supported on the left and right sides of the wheel 7, these shaft supports have become even stronger.

A shaft support body 20 pivotally supports the inner side of this front wheel shaft 14.
has a structure to be attached to the outer gear case 5, so when assembling the sun gear shaft 18 and the bevel gear 17 into the gear chamber 5a, the shaft support 20 is not attached and the large gear chamber 5 is installed.
This installation work can be easily performed with the configuration in a.

Further, in the shaping and manufacturing of the outer gear case 5, there is no need to mold something such as a partition wall into one piece, so the manufacturing work is easy and the manufacturing cost is low.

[Brief explanation of the drawing]

The figure is a longitudinal sectional front view showing one embodiment of this invention. Description of symbols: 1...Front axle housing, 2...Inner gear case, 3...Front wheel drive shaft, 2a...Lower journal boss, 4.1
0.11.15.16゜21, 25...Bearing, 5...Outer gear case, 5a...
・Gear chamber, 5b...Top journal hole, 5C・
...Lower journal hole, 5d...Inner wall, 5e...Seat, 6...Top cover, 6a...
... Upper journal boss, 7. 8.12.17・
...Bevel gear, 9...Rotation center axis, 1
3...Front wheel, 18...Sun gear shaft,
19...Sun gear, 20...Shaft support,
20 a... Inner hole, 22... Outer cover, 2
3... Internal gear, 24.29... Bolt, 26... Carrier, 27... Planet gear, 28'... Pin , 14...Front wheel axle.

Claims (1)

[Scope of utility model registration request] The outer gear case, which supports the front wheel shaft, is fitted into the inner gear case so that the steering rotation can be freely rotated, and the rotation center shaft, which is aligned with the steering rotation center, is connected to the front wheel drive shaft. A carrier of a planetary motion reduction mechanism provided to be driven via the upper bevel gear mechanism and housed in the outer gear case is coupled to the front wheel shaft, and the sun gear shaft is connected to the lower bevel gear mechanism by the rotation center axis. In the front wheel drive device configured to be driven through A front wheel drive device for a vehicle that is pivotally supported on a shaft support mounted internally, and in which the above-mentioned shaft support positions are on the left and right of a planetary gear.