KR970005885Y1 - Four wheel drive vehicles gearing device - Google Patents

Abstract

No summary.

Description

Drive of four-wheel drive vehicle

1 is a diagram showing a power system diagram of a driving device of a four-wheel drive vehicle according to the present invention;

2 is an excerpt of an essential part of a drive mechanism of a four-wheel drive vehicle of the present invention.

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

2: transmission 4: output gear

5: front wheel differential gear 6: driven gear

7: front wheel 11: propulsion shaft

13: switch clutch 15: rear axle differential

17: rear wheel 18: home

19: actuator 20: diaphragm

21: shift rod 24: first tube

25: second tube 26: vacuum pump

27: solenoid valve 28: steering shaft

29: sensor 30: relay switch

The present invention relates to a drive mechanism of a four-wheeled vehicle. More specifically, in a four-wheel drive vehicle in which a gun and rear wheel differential are directly connected to a four-wheel drive vehicle, the front wheel is automatically driven by the four-wheel drive when the steering wheel is over a certain steering angle. It relates to a drive of a four-wheel drive vehicle that can be switched to the drive.

The four-wheel drive system includes a manual single-acting type in which four-wheel drive is selected in two-wheel drive according to a driver's operation, and a four-wheel drive type that always distributes power of the engine four-wheel regardless of operation.

The four-wheel drive vehicle distributes the engine's power evenly to the four wheels to increase the rotational force of each wheel, which has the advantage of excellent driving performance on uneven roads, snow, ice and muddy roads. There is also a problem in that the number of parts and the weight of the vehicle are increased due to the need for a differential and rear wheel differential and a central differential and transfer case for distributing power to both differentials.

On the other hand, the increasingly common front-wheel drive vehicles transverse engines, transmissions, and differentials, and have the possibility of making four-wheel drive systems more compact than other types of vehicles.

In a front wheel drive vehicle, the four wheel drive is composed of a front wheel differential and a rear wheel differential, and a central differential and a viscous coupling for distributing power therebetween.

The above-mentioned biscus coupling alternately accommodates two kinds of disks having several holes perforated inside the cylindrical container body, one disk is connected to the cylindrical container body, and the other disk is connected to the shaft, It is filled and sealed with the highly viscous silicone oil in the above-mentioned container body.Silicone oil acts as a power transmission medium between the two types of disks, and is uniformly or differentially coupled between the two shafts according to the load applied to both shafts. give.

In such a front wheel drive device, a four-wheel drive vehicle has a central differential and a viscous coupling for distributing power to the front and rear wheel differentials, and selectively adjusts the power transmitted to the rear wheels, thereby turning corners in a low speed range. It is possible to prevent the tight corner braking caused by the speed difference due to the casting and rear wheel radius difference.However, the driving performance is deteriorated because the corresponding front and rear load distribution of the vehicle before and after the vehicle acceleration is not distributed. Of course, there is a disadvantage in that it is structurally complicated to secure space for mounting in the engine room.

Therefore, in order to solve this problem somewhat, a manual single-acting four-wheel drive system that directly connects the front and rear wheel differentials is adopted. This is because the front and rear wheel differentials are directly connected to the optimum front and rear. With the distribution of driving force, it is possible to improve the driving performance on the ice such as roads and snowy roads with rough road conditions by increasing the rotational force of each wheel.

However, when cornering turning with a large steering angle in the low speed region, the tight corner breaking (front: slip, rear: idle) occurs due to the difference in the rotational speed of the front and rear wheels due to the difference in the turning radius of the rear wheel. In order to solve the tight corner braking phenomenon by switching from the 4 wheel drive system to the front wheel drive system by manually operating the separately provided control lever to cut off the power transmitted to the rear wheel, the operating lever must be operated manually. Because of the cumbersome operation, there is a problem inconvenient to use.

This invention was devised to solve the problems of the prior art as described above, and the object of this invention is to drive the four wheels only when the steering wheel is more than a certain steering angle in a manual single-acting four-wheel drive vehicle in which the front and rear wheel differentials are directly connected. It is possible to automatically switch to the front wheel (front) in the front to provide a four-wheel drive vehicle driving apparatus that can improve the steering stability by preventing the tight corner breaking phenomenon occurring during cornering turning with a large steering angle.

In order to realize the object as described above, the present invention has a driven gear that is geared with the output gear of the transmission, as well as a front wheel side differential that receives the power and transmits it to the front wheel side, and the front wheel side differential. The rear wheel differential is coupled to the driven gear of the gearbox to transmit the power transmitted by the propulsion shaft to the rear wheel, and the power transmitted to the rear wheel differential from the driven gear of the front wheel differential is selectively interrupted. A drive device for a manual single-actuated four-wheel drive vehicle comprising a switching clutch, comprising: an actuator fixed to a diaphragm in a groove formed on an outer circumferential surface of the switching clutch and inserted with a free end of a shift rod capable of lifting and lowering the actuator; It is installed in communication with the first and second tubes on the upper and lower sides of the diaphragm and in communication with the vacuum pump that generates the negative pressure. Four-wheel characterized in that it consists of a solenoid valve for selectively switching the flow path according to the output signal of the sensor, and a sensor for sensing the steering angle of the steering wheel as well as electrically connected through the solenoid valve and the relay switch. Provided is a driving device for a driving vehicle.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention in more detail as follows.

1 is a diagram showing a power system diagram of a drive device of a four-wheel drive vehicle according to the present invention, and FIG. 2 is an excerpt view of a main part of a drive device of a four-wheel drive vehicle of the present invention, wherein the engine 1 is a transmission (2). ), And the power of the engine 1 is transmitted to the transmission 2 via the normal clutch 3.

The driven gear 6 of the front wheel side differential 5 is gear-coupled to the output gear 4 of the transmission 2 so as to transmit power to the front wheel 7.

The driven pinion 6a is geared to the driven gear 6 of the front wheel side differential 5, and a drive spline 8 is provided on its axis.

A bevel gear 10 is provided which is in contact with the drive spline 8 and has a driven spline 9 extending in the longitudinal direction and is geared to the drive side pinion 12 of the propulsion shaft 11.

Each of the splines 8 and 9 described above is adapted to selectively control the power transmitted to the propulsion shaft 11 by spline coupling of the switching clutch 13 to the outside.

The driven pinion 14 of the propulsion shaft 11 is gear-coupled with the ring gear 16 of the rear wheel side differential 15 to transmit power to the rear wheel 17.

The switching clutch 13 has a groove 18 formed along the outer circumferential surface thereof so that the free end of the shift rod 21 provided on the diaphragm 20 of the actuator 19 is inserted and locked so that the upper side is operated according to the operation of the actuator 19. By sliding in the direction, the rotational force of the manual spline 8 is prevented from being transmitted to the driven spline 9 and the power transmitted from the driven gear 6 of the current side differential 5 to the propulsion shaft 11 is interrupted. .

The first and second tubes 24 and 25 communicate with each other on the upper and lower sides of the diaphragm 20 of the actuator 19, as well as the slanoid valve 27 installed in communication with the vacuum pump 26 generating negative pressure. Is provided to switch the flow path according to the output signal of the sensor to be described later to operate the actuator 19.

The solenoid valve 27 is electrically connected via a detection sensor 29 for detecting the steering angle of the steering shaft 28 and the relay switch 30, so that the steering angle of the steering shaft 28 is greater than or equal to a predetermined angle. The relay switch 30 is turned on to apply the power to the solenoid valve 27 as it detects this and outputs an output signal.

In the figure, reference numeral 31 denotes a one-way valve.

In this design, the power of the engine 1 is transmitted from the output gear 4 of the transmission 2 to the driven gear 6 so that the power is transmitted to the front wheel 7 by the front wheel side differential 5. As the drive pinion 6a geared to the driven gear 6 is rotated at the same time as it is transmitted, the drive spline 8 provided on the shaft and the driven spline 9 provided in the longitudinal direction are splined by the switching clutch 13. Therefore, the rotational force of the drive spline 8 is transmitted to the driven spline 9 so that power is transmitted to the bevel gear 10.

Therefore, power is transmitted to the propulsion shaft 11 by the driving side 12 geared to the bevel gear 10 to be finally transmitted to the driven shaft pinion 14 and the ring gear 16 geared to the gear.

Therefore, the driving force is simultaneously transmitted to the rear wheels 17 by the rear wheel side differentials 15 having the ring gears 14, so that the power of the engine 1 is evenly distributed to the four wheels in an optimal state. It is possible to show excellent driving performance on roads with bad road conditions or on snowy roads, ice and muddy roads due to the increased rotational power of.

In this state, when the steering angle of the steering shaft 28 is large when the turning radius of the rapid curve has a small turning radius, the detection sensor 29 for detecting the steering angle detects this and outputs an output signal and at the same time the relay switch 30 As it is turned on, power is applied to the solenoid valve 27 to change the flow path thereof, so that the negative pressure of the storage tank 26 is supplied to the upper side of the actuator 19 through the first tube 24.

Accordingly, as the diaphragm 20 of the actuator 19 is raised as shown by the dashed-dotted line in FIG. 2, the rod 21 is lifted so that the switching clutch 13 is splined to each of the splines 8, 9. Due to the increase in the rotational force of the spline 8 is not transmitted to the driven spline 9, the switch from the four-wheel drive system to the front wheel 7 drive system.

As the power transmission of the engine 1 is switched to the front wheel 7 drive system, it is caused by the speed difference due to the difference in the rotation radius of the front wheel 7 and the rear wheel 17 during the cornering turning of the rapid curve having a small rotation radius. Steering stability can be preserved by preventing the tight corner breaking phenomenon from occurring on the surface.

As such, when the steering is completed, as the relay switch 30 is turned off and the solenoid valve 27 is restored to an initial state, the negative pressure generated by the vacuum pump 26 is actuated through the second tube 24. ) Is supplied to the lower side of the diaphragm 20 to maintain a parallel state.

Thus, the switching clutch 13 is lowered as shown by the solid line in FIG. 2 and splined to each of the splines 8 and 9 to optimize the power of the engine 1 to the respective wheels 7 and 17. Distributes evenly in the state of to preserve excellent running performance.

As described above, since the power transmission path is directly connected to the rear wheel side differential during normal driving, the optimum power distribution corresponding to the dynamic load distribution of each vehicle is possible, thereby improving driving stability. Of course, when turning the corner of a sharp curve with a small turning radius, the steering angle is detected and the solenoid valve is operated in accordance with the output signal.The actuator can be operated to switch automatically from the four-wheel drive system to the front-wheel drive system. Due to the difference in the rotational speed (the front wheel is insufficient rotation, the rear wheel is excessive rotation) due to the difference in the turning radius of the rear wheel has a merit that can improve the steering stability by preventing the type corner breaking shape in advance.

Claims (1)

(Twice correcting) a front clutch, a rear wheel, and a rear clutch, which includes a switching clutch for regulating the power transmitted to the rear wheel differential, wherein the switching clutch acts by a steering angle signal to drive a two-wheel drive or a four-wheel drive. In a driving device of a four-wheel drive vehicle that can be selectively driven, The switching clutch 13 is connected to the diaphragm 20 which divides the inner region of the actuator 19 through the shift rod 21, and the divided region is divided into the first tube 24 and the first tube 24, respectively. The solenoid valve 27 communicates with the ports of the solenoid valve 27 by the second tube 25. The solenoid valve 27 communicates with the vacuum pump 26 to change the position of the diaphragm 20 by the vacuum pressure of the vacuum pump. And a shift rod (21) to operate the switching clutch (13).