KR19980047982A - Variable longitudinal reduction gear for automobile - Google Patents

Abstract

An oil guide rib which protrudes from the inner side of the transmission case to be inclined toward the flange part so that oil can be easily supplied to the oil seal which generates dry friction due to the mounting of the seal bearing on the pinion drive shaft of the transmission;

It is to provide a lubrication structure of a transmission oil seal for a vehicle including an oil lubrication hole formed by drilling the flange portion so that the oil flowing through the oil guide rib is supplied to the seal bearing.

Description

Variable longitudinal reduction gear for automobile

1 is a block diagram showing a power transmission device to which the present invention is applied.

2 is a view showing a variable longitudinal reduction device according to the present invention.

3 is a diagram illustrating the operation of the present invention by lever analysis.

* Description of the symbols for the main parts of the drawings *

2: engine 4: first reduction means

6: differential device 8: wheel

10 second deceleration means 16 connecting shaft

18: sun gear 20: pinion gear

22: first friction element 24: carrier

26: ring gear 28; Second friction element

30: power transmission member

[Field of Invention]

The present invention relates to a longitudinal reduction device for a vehicle, and more particularly, to a variable longitudinal reduction device for a vehicle in which a planetary gear set, a clutch, and a brake are applied to generate a necessary driving force by varying the longitudinal reduction ratio when necessary.

[Prior art]

Commonly known longitudinal reduction gears are composed of a drive reduction pinion and a ring gear type as a reduction gear, a worm and a worm gear type, a bevel gear, and a hypoid gear type.

The longitudinal deceleration device is a device in which the final deceleration is performed to change the power received from the propulsion shaft to a right angle or an angle close to the right angle and transmit it to the rear axle and to increase the rotational force according to the use of the vehicle.

The small commercial vehicle to which the above-mentioned longitudinal reduction gear is applied cannot always be loaded with loads, but the mounted longitudinal reduction gear continues to decelerate the power to reduce driving performance and ride comfort, thereby degrading vehicle operation efficiency.

The longitudinal reduction gear is set to the longitudinal reduction ratio that occurs in only one case, and thus the fuel economy is satisfied by satisfying only one portion of the driving force.

[Summary of invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a variable longitudinal reduction device for a vehicle in which a planetary gear set, a clutch, and a brake are applied to generate a necessary driving force by varying the longitudinal reduction ratio when necessary.

The present invention for realizing the variable in the variable speed reduction device provided between the vehicle speed reduction device and the differential device;

First deceleration means for decelerating power of the engine;

And a second deceleration means for transmitting the decelerated power from the first deceleration means to the wheels through the differential gear so as to be controlled by the friction element.

The second deceleration means includes a sun gear to which power is input from the first deceleration means through a drive shaft, a pinion gear which is integrally rotated with the sun gear by a carrier under the control of the first friction element on the outer circumference of the sun gear, and A variable gearbox for an automobile comprising a ring gear fixedly controlled by a second friction element while positioning the pinion gear at an inner circumference, and a power transmission member installed to transmit deceleration power from the pinion gear to a differential gear device. have.

EXAMPLE

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the present invention will be described in more detail.

FIG. 1 is a block diagram showing a power transmission device to which the present invention is applied, and FIG. 2 is a view showing a variable speed reduction device according to the present invention, and reference numeral 1 denotes a speed reduction device.

Said variable longitudinal reduction gear 1 has a first deceleration means 4 for decelerating the power of the engine 2 and a deceleration from the first deceleration means 4 to the wheels 8 via a differential device 6. The second power reduction means 10 is configured to be controlled by the friction element.

The first deceleration means (4) is installed between the transmission (12) and the differential device (6) in a general longitudinal reduction gear, and decelerates in power transmission at a reduction ratio set on the wheel (8).

The second deceleration means 10 is a planetary gear set which is input from the first deceleration means 4 to the sun gear 18 which is powered through the connecting shaft 16.

The pinion gear 20 of the second deceleration means 10 is located on the outer periphery of the sun gear 18 and rotates integrally with the sun gear 18 by the carrier 24 under the control of the first friction element 22. It is.

The ring gear 26 of the second deceleration means 18 is controlled by the second friction element 28 with the pinion gear 20 positioned at its inner circumference.

The power transmission member 30 of the second deceleration means 18 is connected so as to transmit the deceleration power from the pinion gear 20 to the differential device 6.

The first friction element 22 is a multi-plate clutch, the second friction element is made of a band brake, and is controlled by a hydraulic control device (not shown).

The hydraulic control device may be configured to operate by receiving an electric signal by the driver's operation or to operate by a signal of the electronic control device.

According to the present invention made as described above, the power transmitted to the carrier 24 is transmitted to the power transmission gear 20 by operating only the first friction element 22 in the released state of the second friction element 28 during driving. To the differential 6 directly connected via the member 30.

In this case, since the first friction element 22 and the differential device 6 are directly connected to each other, the low reduction ratio is output to the differential device 6 without being controlled by the second deceleration means 10.

When the vehicle requires a large driving force, the first friction element 22 is released and the second friction element 28 is operated so that the power input to the sun gear 18 is transmitted to the power transmission member 20. Through 30, the secondary decelerated power is to be transmitted to the differential device (6).

Looking at the lever analysis method that can visually represent the operation process of the planetary gear set of the variable longitudinal reduction device (1) is the same as the third degree.

That is, the sun gear 18 for the first node N1 set on the lever L, the planetary carrier 24 for the second node N2, the power transmission member 30, and the ring gear 26 for the third node N3. ), The load is input through the sun gear 18 when the load is loaded, indicating that the ring gear 26 acts as a reaction element to output through the planet carrier 24, the input of the first node (N1) The line connecting the line T1 and the third node N3 and the line T2 most closely connected to the second node N2 become a line representing the reduction ratio.

When the vehicle does not load the cargo, when input is made through the sun gear 18 and the planet carrier 24, the input lines T1 and T2 of the first node N1 and the second node N2 appear and The line T3 connecting the three nodes N3 nearest to each other becomes a line representing the power output.

In other words, since the present invention has a low deceleration ratio when the cargo is not loaded, the first friction element 22, which is a clutch, is operated to directly connect the connecting shaft 16 and the existing longitudinal reduction gear to generate low torque. .

Accordingly, when the cargo is loaded, the operation of the first friction element 22 is canceled, and the second friction element 28, which is a brake, is operated to output the input gear 24 to the sun gear 18 to the input gear 24. And generating a reduction ratio by the variable reduction device 1 to enable a large torque to be output.

The present invention as described above is an invention to improve the climbing power as well as improve fuel economy and ride comfort by varying the longitudinal reduction ratio according to the presence or absence of cargo in a small commercial vehicle.

Claims (2)

In the variable speed reduction device provided between the vehicle speed reduction device and the differential device, First deceleration means (4) for decelerating the power of the engine (2); A vehicle characterized in that it comprises a second deceleration means (10) such that the transmission of the decelerated power from the first deceleration means (4) to the wheels (8) via the differential device (6) is controlled by friction elements. Variable speed reducer 2. The sun gear 18 according to claim 1, wherein the second deceleration means 10 is a planetary gear set and a sun gear 18 through which power is input from the first deceleration means 4 through the connecting shaft 16, and outside of the sun gear 18. A pinion gear 20 which is integrally rotated with the sun gear 18 by the carrier 24 by the control of the first friction element 22 at the periphery, and the second friction element with the pinion gear 20 positioned at the inner periphery. And a ring gear (26) controlled by (28) and a power transmission member (30) installed to transmit the deceleration power from the pinion gear (20) to the differential device (6).