Differential device

A differential device includes a main flywheel, a main shaft integrated with the main central gear, prime train of planet gears, secondary train of planet gears, secondary shaft integrated with the secondary central gear, and a fixing plate. This improved device can resolve problems of current bevel gear-driven differential devices and improve dramatically the drive force and stability of the differential device.

RELATED U.S. APPLICATIONS

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REFERENCE TO MICROFICHE APPENDIX

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FIELD OF THE INVENTION

The present invention relates generally to a differential device, and more particularly to a device comprising a main flywheel, a main shaft integrated with the main central gear, prime train of planet gears, secondary train of planet gears, secondary shaft integrated with the secondary central gear, and a fixing plate. The device can be used in transmission systems.

BACKGROUND OF THE INVENTION

A differential device, also known as a differential gear, is commonly used on the transmission mechanism of automobile tires. Since the distance traveled by the left and rights tires when the automobile is making a turn is different, the number of revolution cycles is different too. Herein, a differential device is employed to rotate the left and rights tires in opposite directions, as known as the effect of “differential”. Generally, current differential devices achieve countermovement of the two output shafts by gearing drive of bevel gear. However, as the gearing drive between the bevel gear, the input shaft and two output shafts is single side direction, the drive force and its stability of this kind of bevel gear drive structure is far from desirable. Furthermore, as far as a bevel gear is concerned, the augmentation of its size is less likely to bring about effective increases of such variables as modulus and number of teeth, which are critical for the increase of its friction. Consequently, this kind of differential device has little room for any improvement. Therefore, an ideal and practical new differential device offsetting such shortcomings is called for in relevant industry.

In light of this and drawing on years' experiences in the manufacturing and designing work of relevant products, this inventor proposes a practical design after careful evaluation and design to achieve such purposes.

BRIEF SUMMARY OF THE INVENTION

The differential device revealed by this invention features an innovative design consisting of two trains of planet gears and central gears. They are geared with each other at several places and at average intervals. This can resolve the problems of traditional bevel gear differential devices and greatly enhance the drive force and stability. Meanwhile, increasing the size of gears can effectively increase the number of teeth and modulus of each train of gears. Accordingly, the driving friction can be easily controlled. The overall system is quite an improvement in terms of utilization and effectiveness.

The above is the detailed description on the technical features of this invention. Those who are familiar with this technique can adjust and change on compliance with the spirit and principles of this invention. Any such adjustments and changes should be subject to the scope prescribed by the patent.

DETAILED DESCRIPTION OF THE INVENTION

The features and the advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of a preferred embodiment of the present invention with reference to the accompanying drawings.

As shown inFIGS. 1–5, a differential device embodied in the present invention comprises: a flywheel10, which has a center hole11; a main shaft20, which penetrates the center hole11of the flywheel10and whose inner and outer ends stretch on both sides the flywheel10; and a main central gear21, which is integrated in the inside of the main shaft20.

The invention also has a main train of planet gears30, which consists of several gears31, each of which is positioned around and connected with the main flywheel10at the same axis direction at intervals by jack post32. The off-center side of each gear31is geared up with the main central gear21to transmit drive.

There is a secondary train of planet gears40, which consists of several gears41, each of which is positioned around and connected with the main flywheel10at the same axis direction at intervals by jack post42. Each gear41of the secondary train of planet gears40is geared up with corresponding gear31of the main train of planet gears30. The gears41of the secondary train of planet gears40on the side of the main flywheel10are underlaid with space block43to be staggered with the main central gear21.

The invention also includes a secondary shaft50, which has a central sheath51at its inner end to fit the inner end of the main shaft.

There is also a secondary central gear52which is fixed at the inner end of the secondary shaft50and positioned to geared with the secondary train of the planet gears40.

The invention has a fixing plate60, at center of which there is a penetration hole6to fit into the secondary shaft50. The off-center of this fixing plate60is planted with fixing holes62to fit the jack posts3242of the main and secondary train of planet gears3040.

Where all gears31of the main train of planet gears30are higher than the main central gear21.

According to above-mentioned innovative design, the differential device revealed in this invention operates asFIGS. 5 and 6. Presume that the main shaft20and the first central gear21rotate clockwise (as indicated by Arrow A), then the gears31of the main train of planet gears rotate in the opposite direction (as indicated by Arrow B). The gears41of the secondary train of planet gears would be driven to rotate clockwise (as indicated by Arrow C), which, in turn, drive the geared secondary central gear52and the secondary shaft50to rotate anti-clockwise (as indicated by Arrow D). Therefore, the main shaft20and the secondary shaft50would rotate respectively in the opposite direction and at different speed.