JPH0516440Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an improvement in a differential gear device equipped with a viscous cut spring.

(Prior Art and Problems Thereof) Conventionally, a differential gear device that is arranged between the wheels or between the front and rear output shafts (axles) of a four-wheel drive vehicle has been proposed in which left and right output shafts 2, 3 are connected by bevel gears 4a-4d within a differential case 1, and a wet clutch 5 is provided which limits differential when a difference in rotation occurs between the left and right output shafts 2, 3, as shown in FIG. 3 (see Japanese Patent Application Laid-Open No. 60-176827).

Furthermore, in place of the above-mentioned wet clutch, a viscous coupling spring has been proposed that utilizes viscous fluid to apply frictional force between friction plates.

By the way, since conventional viscous cut springs have annular friction plates arranged in multiple stages in the axial direction, the fluid pressure generated by centrifugal force is not substantially utilized at all. In order to obtain a predetermined transmission torque, the diameter of the friction plates is increased to increase the area in which they face each other. In other words, there was a problem in that the viscous cut spring itself had to be made larger.

(Purpose of the invention) The present invention was made to solve the above-mentioned conventional problems, and its purpose is to make the differential gear device more compact.

(Structure of the invention) Therefore, the invention consists of two output shafts, an inner gear into which power from a power source is input, a pinion that meshes with the inner gear and transmits power to one of the output shafts, and a pinion that meshes with the pinion and transmits power to one of the output shafts. , a sun gear that transmits power to the other output shaft, and a planetary differential gear that allows a rotation difference between the two output shafts, and a planetary differential gear adjacent to the planetary differential gear and the other The above 2 is arranged around the output shaft of
A differential gear device is equipped with a viscous cut spring that limits differential rotation when a rotation difference occurs between the two output shafts, and the power receiving side end of one of the output shafts receives power from the pinion. Disposed adjacent to the planetary differential gear on the opposite side of the viscous cut spring,
The power-receiving end of the other output shaft that receives power from the sun gear is spline-coupled to the cylindrical portion of the base member of the viscous cut spring, and the tip of the cylindrical portion fits into the center of the sun gear. It is spline connected to the sun gear, and the above end of the other output shaft is arranged on the opposite side of one output shaft, with the above end adjacent to the planetary differential gear, and the above differential gear is located between the two output shafts. It is characterized by being located in

(Effects of the invention) According to the invention, the power from the sun gear of the other output shaft is disposed on the opposite side of one output shaft with the receiving end adjacent to the planetary differential gear, Since the differential gear is located between both output shaft ends, a planetary differential gear is not arranged around the output shaft, making the radial dimension of the differential gear system compact. I can do it.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, a transmission 12 is connected to an engine 10 mounted on an automobile via a clutch 11, and a differential gear device 1 is connected to the transmission 12.
3 are connected, and constant velocity joints 16, 17 are connected to the left and right output shafts 14, 15 of the differential gear device 13.
The left and right tires 18, 19 are connected via the.

As shown in detail in FIG. 1, the differential gear device 13 includes a differential case 23 in which a left differential case 20 and a right differential case 21 are fastened and fixed by flanges 20a and 21a with bolts 22. The part 20b is the transmission housing 4
The bearing part 21b of the right differential case 21 is supported by the left bearing 24 of the transmission housing 45.
It is supported by the right bearing 25.

Flange 20 of the above left and right differential cases 20, 21
a, 21a, an input gear 27 that meshes with the output gear 26 of the transmission 12 is connected to the bolt 2.
It is fastened together with 2.

The bearing portion 20b of the left differential case 20 supports the inner end portion 14a of the left output shaft 14, and the bearing portion 21b of the right differential case 21 supports the inner end portion 15a of the right output shaft 15.

In the left differential case 20, a center hole 29a of a base member 29 of a viscous coupling ring 28 is spline-coupled to the inner end 14a of the left output shaft 14, and the base member 2 extends toward the right differential case 21.
A sun gear 30 is spline-coupled to the tip of the cylindrical portion 29b of 9, and a bottom wall portion 31a of the case member 31 of the viscous cut spring 28 is connected to the flange portion 29c of the base member 29 in a predetermined manner at the intermediate portion of the cylindrical portion 29b. The bottom wall portion 3 is fitted in an oil-tight manner with an interval of
A peripheral wall portion 31b welded to the outer periphery of the base member 29 is oil-tightly fitted to the flange portion 29c of the base member 29.

In the right differential case 21, a center hole 32a of a carrier 32 is spline-coupled to the inner end 15a of the right output shaft 15, and a cylindrical portion 32b of the carrier 32 extending toward the bearing portion 21b of the right differential case 21 is connected to the inner end 15a of the right output shaft 15. It is fitted into the portion 21b.

The flange portion 32c of the carrier 32 faces the bottom wall portion 31a of the case member 31 of the viscous coupling 28 with the sun gear 30 in between, and the bottom wall portion 31a and the flange portion 32c are connected to the pinion (planetary gear) 33, pinion pin 35 supporting pin 34;
They are integrally connected at 36.

The outer pinion 33 is meshed with an inner gear 37 formed on the inner peripheral surface of the right differential case 21 and an inner pinion 34, and the inner pinion 34 is further meshed with the sun gear 30.

On the other hand, the base member 29 and case member 31 of the viscous cut spring 28 form a sealed space 38 in which a fluid is sealed, and within the space 38 there is a cylindrical first friction plate 39 extending in the axial direction. ，
..., 39 and second friction plates 40,..., 40 are arranged concentrically in the radial direction in multiple stages and are held at a predetermined interval by spacers 41, 42, respectively. The two friction plates 40 are installed so as to be fitted alternately.

The end of each first friction plate 39 is spline-coupled to an annular groove formed on the inner surface of the flange 29c of the base member 29, and the end of each second friction plate 40 is connected to the bottom wall 31a of the case member 31. spline connection to an annular groove formed on the inner surface of the

With the above configuration, the output gear 26 of the transmission 12 rotates the differential case 23 together with the input gear 27 of the differential gear device 13, and the inner gear 37 of the differential case 23 rotates the sun gear 30 via the pinions 33 and 34. At the same time, the base member 29 of the viscous cut spring 28 is rotated and spline-coupled to the center hole 29a of the base member 29. Inner end 14a of left output shaft 14
receives power from the sun gear 30 and drives the left axle 14.
is rotated. At the same time, viscous cutlet spring 2
The carrier 32 is rotated via pinion pins 35 and 36 that connect the case member 31 of No. 8 and the carrier 32, and the inner end 15a of the right output shaft 15 spline-coupled to the center hole 32a of the carrier 32 is connected to the pinion 33. , 34, the right output shaft 15 is rotated.

When a rotation difference occurs between the left and right output shafts 14 and 15, the fluid in the sealed space 38 of the viscous coupling spring 28 pushes the friction plates 39 and 40 with centrifugal force, so that differential movement is limited (defroc). become.

At this time, since each friction plate 39, 40 of the viscous cut spring 28 extends in the axial direction and is arranged in multiple stages in the radial direction, fluid pressure due to centrifugal force acts effectively on the friction plates 39, 40. Therefore, compared to a conventional viscous cut spring in which annular friction plates are arranged in multiple stages in the axial direction and no centrifugal force is utilized, this embodiment has a larger transmitted torque if the outer dimensions are the same.

Therefore, it is not necessary to increase the diameter of each friction plate 39, 40 in order to obtain the same transmission torque as the conventional viscous coupling spring, so that the viscous coupling spring 28 can be constructed compactly.

Further, a planetary differential gear consisting of a sun gear 30, pinions 33, 34, and an inner gear 37 is located between the left and right output shafts 14, 15, and the differential gear is arranged around the output shaft. No problem and viscous cutlet spring 28
Coupled with the compactness of the differential gear device 13, the differential gear device 13 becomes compact.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a differential gear device according to the present invention,
FIG. 2 is a front view showing the relationship among the engine, transmission, differential gear, and wheels, and FIG. 3 is a sectional view of the conventional differential gear. 13... Differential gear device, 14, 15... Output shaft, 23... Differential case, 28... Viscous cut spring, 38... Sealed space, 39, 40... Friction plate.

Claims (1)

[Claims for Utility Model Registration] Two output shafts, an inner gear into which power from a power source is input, and meshing with the inner gear,
A planetary differential gear that is equipped with a pinion that transmits power to one output shaft, and a sun gear that meshes with the pinion and transmits power to the other output shaft, allowing for a rotational difference between the two output shafts. and a viscous cut spring disposed adjacent to the planetary differential gear and around the other output shaft to limit the differential when a rotational difference occurs between the two output shafts. a differential gear device, wherein a power receiving end of one output shaft that receives power from the pinion is adjacent to the planetary differential gear on the opposite side of the viscous cut spring. The end of the other output shaft on the power receiving side that receives power from the sun gear is spline-coupled to the cylindrical portion of the base member of the viscous cut spring, and the tip of the cylindrical portion is connected to the sun gear. The other output shaft is disposed on the opposite side of one output shaft, with the end of the other output shaft adjacent to the planetary differential gear, and A differential gear device characterized in that a gear is located between both output shafts.