JPS62198520A - Full time four-wheel drive device - Google Patents

Abstract

PURPOSE:To equalize the inertial weight of a center shaft with that of a circular shaft by arranging the constitution in such a way that a weight balancer is provided in a bebel gear for driving a center shaft in a double differential device where a bebel gear is used, in a full time four-wheel drive vehicle in which a vertical engine is installed. CONSTITUTION:The driving force of an engine is transmitted to an input shaft 39 and the input shaft 39 rotates a planetary carrier 21 to drive a wheel. Then the differential motion of internal/external planetary gears 9, 5 intersectionally work on the right front axles 23, the left rear axle 13 and the left front axles 22, right rear axle 14, according to the difference between the rotation speeds of front and rear, left and right axles 22, 23, 13, 14. The inertial resistance of a circular shaft 26 is larger than that of a center shaft 8 but it is offset by the inertial weight of a balancer 20 and left and right rear shafts 13, 14 rotates with a uniform torque. In this way the inertial weight of the center shaft and that of the circular shaft can be equalized.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an improvement in a permanent four-wheel drive vehicle equipped with a longitudinally installed engine.

(b) Prior art The propeller shaft of a generally known four-wheel drive vehicle equipped with a vertically mounted engine is annular and hollow, as disclosed in Japanese Patent Application No. 60-279117, and it is better to arrange two concentrically in order to save space and cost. , which is advantageous in terms of transmission efficiency, but in this case there is a problem that the inertial weight of the annular shaft is larger than that of the central shaft.

(c) Problems to be Solved by the Invention This invention provides a bevel gear that drives the center shaft of a double differential device using a bevel gear, and an annular cast iron weight balancer integrated therewith. The purpose is to equalize the inertia weight of the annular shaft and the annular shaft.

(d) Means for Solving the Problems To explain this invention with reference to the drawings, FIG. 1 is a side sectional view of a double differential device according to a first embodiment of the invention, and
The figure is a schematic plan view showing a skeleton of the power train of the first embodiment.

The double differential 3 is arranged on the same axis via the engine 1 and the transmission 2, and the external bevel gear 4 is in contact with the radial external bevel gear 6 via the external planetary gear 5, and the planetary carrier shaft 7 and the central shaft 8, the inner planetary gear 9 is disposed on the inside, and the curved inner bevel gear 10 and the radial inner bevel gear 11 mesh with each other. Internal bevel gear 10.1
1 and the inner planetary gear 9 have the same radius ratio and are provided within the casing 12. As shown in Fig. 5, the left and right rear axles 13.14 have left and right rear...
The rotation of the center shaft 8 is interlocked with the rear drive gear 18 via a universal joint 19 (or constant velocity joint). An annular balancer 20 is provided on the outer periphery of the external bevel gear 4, and a planetary carrier 21 is arranged around the outer periphery. Left and right front axles 22.
The left and right front hypoid gears 24 and 25 directly connect and interlock the radial outer bevel gear 6 and the front chain ear 2f, which are coaxially interlocked with the radial outer bevel gear 6 via an annular shaft 26, and the front chain ear 2f, which is coaxially interlocked with the radial outer bevel gear 11 via an annular shaft 28. It is configured to be rotationally driven by a rear chain gear 29 that is interlocked with the front drive gears 35 and 36 that are interlocked with a chain 30, small chain gears 31 and 32, a front universal joint 33, and a propeller shaft 34. As shown in the third and fourth figures, an annular joint 38 transmits rotational force to the annular shaft 58 through four pins 37, acting in the same manner as the universal joint 19 of the central shaft 8.

(E) Operation The driving force outputted from the engine 1 passes through the known transmission 2, and when the input shaft 39 rotates the planetary carrier 21, the input shaft 39 is directly connected to wheels (not shown). Depending on the difference in required rotational speed of the front and rear left and right axles 22, 23, 13, 14, the inner and outer planetary gears 9, 5 are differentially moved.
As in the well-known patent application No. 60-279117, the right front axle 2
3 and the left rear axle 13 and the same as the left front axle 22 and the right rear axle 1.
It acts across the four. The inertial resistance of the annular shaft 26 is naturally greater than that of the central shaft 8, but it is canceled out by the inertial weight of the balancer 20, and the torque is equal and the left and right rear axles 1
3.14 can be rotated.

(v) Embodiment 6 In the illustrated second embodiment, the input shaft 40. Planetary carrier shaft 42 via planetary carrier shaft 41
is a so-called front-rear differential device type in which the planetary carrier shaft 41 rotates on the rear side, and is similar to the one illustrated in Japanese Patent Application No. 60-279117, but the front side gear 4
3 and the front chain gear 44 are integrally provided, and the rear side gear 45 is integrally provided with the rear chain gear 46, and the chain 3
The front planetary gear 49 has an annular balancer 20 on its outer periphery.
An inner side gear 50 integrally configured with the central shaft 8 rotates directly, and a rear planetary gear 51 rotates with the outer side gear 52.
The left and right front axles 22.23 are connected to the left and right front hypoid gears 53.5.
Reference numeral 4 has a configuration in which propeller shafts 55 and 56 are arranged above and below and rotate via front drive gears 35 and 36 that are interlocked with each other.

(g) Effects of the Invention As explained above, the present invention reduces the inertial resistance difference due to the inertial weight difference of the annular shaft 28 to the central shaft 8 in each double differential device 3.
By installing a balancer 20 on the outer periphery of the front side gear 43 to eliminate the four-pronged front bevel gear that drives the front side gear 43, a current rear two-wheel drive vehicle can be driven into four-wheel drive without the need for major modification. . In the first embodiment, since the double differential device 3 is made of only the planetary carrier shaft 7 on the same circumference,
Furthermore, in the second embodiment, since the front and rear chain gears 44 and 46 are integrated with the front and rear side gears 43 and 45, respectively, it is possible to obtain a double differential device 3 that is both small and lightweight.

[Brief explanation of drawings]

FIG. 1 shows a side sectional view of a double differential according to a first embodiment of the present invention, FIG. 2 is a schematic plan view showing its power train in skeleton form, and FIG. 3 shows an annular joint. FIG. 4 is a front sectional view, FIG. 4 is a folded sectional view, FIG. 5 is a plan sectional view showing the reduction gear 57 of the rear axle, FIG. 6 is a side sectional view of the double differential device according to the second embodiment, and FIG. The figure shows a schematic side view showing a skeleton of the power train to the front axle, and FIG. 8 shows a coplanar schematic view.

Claims (3)

[Claims] (1) Two inner and outer planetary gears are provided on a planetary carrier shaft that intersects at right angles to the center axis, and the rotation of the input shaft that directly connects the engine output to the transmission.
A constant four-wheel drive device characterized by differential rotation between the front right axle and the rear left axle, and between the front left axle and the rear right axle through four bevel gears inside and outside. (2) A constant four-wheel drive system according to claim 1, characterized in that a weight balancer is integrally provided on the outer periphery of a bevel gear that rotates while being directly connected to the central axis of the double differential. (3) The constant four-wheel drive device according to claim 1, characterized in that a front side gear and a rear side gear of the double differential device are integrally provided with chain gears connected to the left and right front axles on the outer periphery.