KR100489388B1 - Drive apparatus for four wheel drive - Google Patents

Abstract

The present invention relates to a driving device for a four-wheel drive vehicle, and more particularly, to prevent friction between the viscous coupling disc and the viscous coupling plate by the rotation wheel between the front and rear wheels during towing, and to prevent the burnout between the front and rear propulsion shafts. It relates to a four-wheel drive vehicle drive device that can block the transmission of power.

The present invention as described above is connected between the front wheel and the rear wheel to transfer the driving force of the engine to the rear wheel, and a plurality of viscous coupling disks spline-coupled on the rear propulsion shaft, and connected to the front propulsion shaft The front propulsion shaft is interposed between the viscous coupling disk and the viscous coupling plate which transmits power by friction with the viscous coupling disk during four-wheel drive, and the viscous coupling disk and the viscous coupling plate are in close contact with each other during towing. And a push means for blocking power transmission between the rear propulsion shaft.

Description

Drive for four-wheel drive vehicle {DRIVE APPARATUS FOR FOUR WHEEL DRIVE}

The present invention relates to a driving device for a four-wheel drive vehicle, and more particularly, to a driving device for a four-wheel drive vehicle that can prevent the transmission of power between the front and rear wheels by operating the viscous coupling by the rotation wheel between the front and rear wheels when towing. It is about.

1 is a block diagram showing a driving device for a four-wheel drive vehicle according to the prior art.

Referring to FIG. 1, a four-wheel drive vehicle driving apparatus includes an engine 10, a transmission 11 for shifting power transmitted from the engine 10, and a front wheel 2 receiving power from the transmission 11. And a center differential 12 for distributing power so as to drive the rear wheel 4 and a side of the center differential 12 to vary the power caused by the rotation wheel between the front wheel 2 and the rear wheel 4. A disperse coupling 13 for distributing, a rear differential 14 connected to the viscous coupling 13 so as to drive the rear wheel 4 by receiving power from the viscous coupling 13, and Apart from the rear differential 14, the front differential 15 is connected to the viscus coupling 13 so that the front wheel can be driven by receiving power from the viscus coupling 13.

In this case, a plurality of disks and plates are in the interior of the viscous coupling 13 so that the driving wheel of the engine 10 is not normally transmitted to the rear wheel 4 and the front wheel 2 slips. To the rear wheel (4).

Therefore, the above-mentioned conventional four-wheel drive vehicle driving device must be towed in a state in which all of the front and rear wheels 2 and 4 are lifted by a special tow vehicle during towing, but between the front and rear wheels 2 and 4. It is possible to prevent the transmission of power.

However, due to the recognition of some drivers, when the tow is pulled with only one wheel, that is, the front wheel 2 lifted, a difference in rotation is generated between the front and rear wheels 2 and 4 so that the viscous coupling 13 is operated. There is this. That is, during traction, not only is burned out by the continuous friction between the disk and the plate of the biscus coupling 13 but also unnecessary power is transmitted to the front wheel 2.

Therefore, the present invention devised to solve the problems of the prior art as described above is a drive device for a four-wheel drive vehicle that can prevent the transmission of the power between the front and rear wheels, as well as preventing the disc and plate of the biscus coupling when towing. The purpose is to provide.

Driving device for a four-wheel drive vehicle according to the present invention for solving the above problems is a front propulsion shaft and a rear propulsion shaft which is connected between the front wheel and the rear wheel to transfer the driving force of the engine to the rear wheel, and a plurality of viscose splined on the rear propulsion shaft A viscous coupling plate coupled to the front propulsion shaft and interposed between the viscous coupling disc to transfer power by friction with the viscous coupling disc during four-wheel drive; It is possible to be characterized in that it comprises a push means for closing the power transmission between the front propulsion shaft and the rear propulsion shaft in close contact with the viscous coupling plate.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a configuration diagram schematically showing a driving device for a four-wheel drive vehicle according to the invention, Figure 3 is a sectional view showing a push means according to the invention, Figure 4 is a view showing the operation of the push means according to the invention It is a block diagram.

As shown in FIGS. 2 to 4, the driving apparatus for a four-wheel drive vehicle of the present invention may transmit the driving force to the front wheels 42 and the driving force of the engine 50 to the rear wheels 44. The front propulsion shaft 51 and the rear propulsion shaft 52 spaced apart from each other in the axial direction between the front wheel 42 and the rear wheel 44, and a plurality of viscous coupling discs 53 splined to the front of the rear propulsion shaft 52. (Hereinafter referred to as VC disk), and a viscus coupling connected to the front propulsion shaft 51 and interposed between the VC disks 53 to transfer power by friction with the VC disks 53 during four-wheel drive. A plate 54 (hereinafter referred to as a VC plate), a spline coupling to the outside of the VC plate 54, and one side of the viscous coupling case 55 (hereinafter referred to as a VC case) protruding toward the front propulsion shaft 51 side; When the towing, the VC disk 53 and the VC plate 54 is in close contact Kim and the push means for blocking the transmission of power between the front propulsion shaft 51 and the rear propulsion shaft 52. That is, the VC disk 53, VC plate 54, VC case 55 is a viscous couple As a component constituting the ring (VC), a viscous coupling, which is usually provided in a power transmission device or a differential device of an automobile, uses the viscosity of oil having a high viscosity to make a four-wheel drive with the VC disk 53 as described above. The push means has a structure that transmits power by the viscous friction of the fluid therebetween. The push means, the inner circumferential surface is spline-coupled to the linear movement on the front propulsion shaft 51 and the rear propulsion shaft 52 so that the outer surface is VC Splines coupled to the case 55 and one side of the hub 61 is rubbed with the VC plate 54, the hydraulic cylinder 62 and the hydraulic cylinder for linearly moving the hub 61 to the VC plate 54 side (6 2) and an actuator comprising a hydraulic supply unit 63 connected to the pipe 64 to supply hydraulic pressure, and control means for driving the actuator when it is determined that the vehicle is towed.

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Here, the hub 61 is splined to the VC plate 54 so as to be linearly movable, and the rear propulsion shaft 52 and the VC case 55 are spline-coupled with the hub 61. 54) is formed long.

In addition, the hydraulic supply unit 63, when the vehicle is an automatic transmission, the hydraulic pump mounted on the vehicle is used, and in the case of the manual transmission, it is preferable that a separate hydraulic pump is installed. Meanwhile, the VC disk 53, The VC plate 54, the VC case 55, and the hub 61 are mounted in an axially symmetrical structure around the front propulsion shaft 51 and the rear propulsion shaft 52, and the hydraulic cylinder 62 is the hub 61. And the hydraulic piston 62a moves forward and backward while the hydraulic piston 62a is moved back and forth when the hydraulic pressure is supplied from the hydraulic supply unit 63. The control means is a hydraulic cylinder 62 of the actuator. The solenoid valve 65 is installed on the pipe 64 to which the hydraulic pressure is supplied, and the front / rear wheels 42 and 44 are rotated, respectively. A sensor 66 for detecting whether the vehicle is towed by the vehicle, and the sensor 66 When the input signal is composed of the solenoid valve (65) ECU (67) to open.

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Here, the sensor 66 transmits a signal to the ECU 67 in consideration that the front wheel 42 is lifted by the tow vehicle when the rear wheel 44 rotates but the front wheel 42 does not rotate.

On the other hand, between the hub 61 and the VC disk 53, when the hydraulic cylinder 62 pushes the hub 61 is removed, the return spring 68 to return the hub 61 to its original position Is installed.

Here, the return spring 68 is supported by the support portion 52a formed on the rear propulsion shaft 52.

Looking at the drive device for a four-wheel drive vehicle according to the present invention configured as described above is operated as follows.

When the four wheel drive in the normal state, the power transmission is carried out through a vice versa coupling (VC) provided between the front propulsion shaft 51 and the rear propulsion shaft 52, the hub 61 and the VC case to the front propulsion shaft 51 Power transmission is effected by the viscous frictional action of the fluid between the VC plate 54 connected via 55 and the VC disk 53 coupled to the rear propulsion shaft 52. In this state, the vehicle breaks down and If the front wheel is towed by the towing vehicle in an emergency such as an accident, the sensor 66 detects the rotation of the front / rear wheels 42 and 44 to regard it as a towing.

Next, when the sensor 66 transmits a traction signal to the ECU 67, the ECU 67 operates the solenoid valve 65 to connect the pipe 64 connecting the hydraulic supply unit 63 and the hydraulic cylinder 62. Open.

Next, the hydraulic piston 62a of the hydraulic cylinder 62 is operated toward the hub 61 by hydraulic pressure, and the hub 61 is pushed by the hydraulic piston 62a to move to the VC plate 54 side.

At this time, since the hub 61 is in close contact with the VC plate 54 side, the VC disc 53 and the VC plate 54 are also in close contact, whereby the VC disc 53 and the VC plate 54 are rotated at the same time.

In addition, since the hub 61 connecting the VC case 55 of the front propulsion shaft 51 and the rear propulsion shaft 52 is in close contact with the VC plate 54 side, the hub 61 is separated from the front propulsion shaft 51. The power transmission between the front and rear propulsion shafts (51, 52) is blocked.

The driving device for a four-wheel drive vehicle according to the present invention configured as described above operates the hydraulic cylinder when the traction is detected by the sensors mounted on the front / rear wheels to closely contact the hub connecting the front propulsion shaft and the rear propulsion shaft to the VC plate side to transmit power. Because of the blocking, the VC disk and the VC plate are rotated at the same time to prevent burnout by friction with each other, as well as to prevent unnecessary power transmission between the front and rear propulsion shaft.

1 is a block diagram showing a driving device for a four-wheel drive vehicle according to the prior art,

Figure 2 is a block diagram showing a driving device for a four-wheel drive vehicle according to the present invention,

3 is a cross-sectional view showing a push means according to the invention,

4 is a block diagram showing the operation of the push means according to the invention.

<Explanation of symbols on main parts of the drawings>

51: forward propulsion shaft 52: rear propulsion shaft

53: biscus coupling disc 54: biscus coupling plate

61: hub 62: hydraulic cylinder

63: hydraulic supply unit 65: solenoid valve

66 sensor 67 ECU

68: return spring

Claims (5)

A front propulsion shaft and a rear propulsion shaft connected between the front wheel and the rear wheel to transmit the driving force of the engine to the rear wheel; A plurality of viscose coupling discs spline-coupled on the rear propulsion shaft, and a viscose coupled to the front propulsion shaft and interposed between the viscus coupling disks to transmit power by viscous friction with the viscous coupling disks during four-wheel drive; A biscus coupling consisting of a coupling plate; And a push means for close contact between the biscus coupling disc and the biscus coupling plate during the towing and blocking transmission of power between the front propulsion shaft and the rear propulsion shaft. The method of claim 1, The push means is a spline coupled to the linear movement between the front propulsion shaft and the rear propulsion shaft and a hub that one side friction with the biscus coupling plate; An actuator for linearly moving the hub; And a control means for driving the actuator to the viscous coupling plate side when the vehicle is determined to be towed. The method of claim 2, The actuator includes a hydraulic cylinder for pushing and moving the hub; Driving device for a four-wheel drive vehicle, characterized in that consisting of a hydraulic supply for supplying hydraulic pressure to the hydraulic cylinder. The method of claim 2, The control means may include a solenoid valve installed on a flow path through which hydraulic pressure is supplied to the hydraulic cylinder to open and close the flow path; A sensor mounted on the front / rear wheels and detecting a traction; And a ECU configured to open the flow path by operating the solenoid valve when the traction signal is input from the sensor. The method of claim 2, And a return spring for returning the hub to its original position when the force of the hydraulic cylinder pushing the hub is removed between the hub and the biscus coupling disc.