KR100301527B1 - Four-wheel drive - Google Patents

Abstract

Disclosed is a four-wheel drive apparatus of a vehicle for adding a simple device for transmitting the power of a front wheel or rear wheel to the remaining wheels by a simple lever operation so that a manufactured front wheel or rear wheel drive vehicle can exhibit four-wheel driving capability. . Gear wheel according to the present invention is integrally formed in the left and right wheels of the front wheel and the left and right wheels of the rear wheel, the power transmission gear is coupled to the gear wheel, the driving force of the wheel is fixed to the support frame of the front and rear wheels to drive Generate hydraulic pressure for delivery to other wheels. Then, the valve device receives the hydraulic pressure generated from the power transmission device through the hydraulic pipe to control the flow of the hydraulic pressure. The present invention adds a simple device to a pre-fabricated front wheel or rear wheel drive vehicle so that the pre-fabricated front wheel or rear wheel drive vehicle can exert a four-wheel drive capability as needed.

Description

Four-wheel drive of a car

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-wheel drive device of an automobile, and in particular, a front wheel or rear wheel drive car manufactured by adding a simple device that transmits the power of a front wheel or a rear wheel to the remaining wheels by a simple lever operation can provide a four-wheel drive capability. The present invention relates to a four-wheel drive device for a vehicle for exertion.

In general, a vehicle may include a front engine rear dirve (FR), a front engine front dirve (FF), and a rear engine rear dirve; RR type) and all-wheel drive type. The all-wheel drive method, so-called four-wheel drive method, has the advantage that the driving power is transmitted to all the wheels when driving on slippery ice roads, sand roads and muddy roads, so that the driving ability of the car can be greatly improved.

Conventional four-wheel drive uses a method of transmitting the engine power of the front wheel to the rear wheel using a flexible shaft. In the case of a four-wheel drive device that moves the flexible shaft, the structure is simple and easy to manufacture, but a backlash phenomenon may occur in which the driving of the front wheel is not immediately transmitted to the rear wheel. That is, when the front wheel starts driving, the power is not immediately transmitted to the rear wheel, but is delayed and transmitted. In addition, when driving at high speed, there is a problem in that power is lost due to friction between the flexible shaft and the outer shell, and in reverse, there is a problem in that power cannot be transmitted to the rear wheels due to the characteristics of the flexible shaft.

The present invention has been invented to solve the above problems, the power of the front or rear wheels driven by a simple lever operation of the user is taken out through the gear device attached to the wheel device and the extracted power is the hydraulic pump and valve device It is an object of the present invention to provide a four-wheel drive device for a vehicle to enable the front wheel or rear wheel drive car manufactured to exhibit the four-wheel drive capability by adding a simple device for transmitting to the remaining wheels that are not driven through.

1 is a block diagram showing a schematic power transmission of a four-wheel drive device of a vehicle according to an embodiment of the present invention.

2 is a cross-sectional view showing an embodiment of a gear wheel attached to the left and right wheels of the front and rear wheels of the vehicle according to the present invention.

3 is a cross-sectional view showing another embodiment of a gear wheel attached to the left and right wheels of the front and rear wheels of the vehicle according to the present invention.

4 is a schematic diagram illustrating a case in which a power transmission device transmits power to a wheel in a four-wheel drive device of a vehicle according to the present invention.

5 is a schematic view for explaining a case in which the power transmission device does not transmit power to the wheel in the four-wheel drive device of the vehicle according to the present invention.

6 is an inflow circuit for explaining the operation of the valve device in the four-wheel drive of the vehicle according to the present invention.

* Explanation of symbols for main parts of the drawings

100a to 100d: wheel 102: gear wheel

106: brake drum 200a to 200d: power transmission device

202: hydraulic pipe 204: hydraulic motor or hydraulic pump

205: first rotating shaft 206: power transmission gear

208: second rotating shaft 210: operation piece

300: valve device

The present invention for achieving the above object, the gear wheel integrally formed in the left and right wheels of the front wheel and the left and right wheels of the rear wheel; A power transmission device gear-coupled with the gear wheels, generating a hydraulic pressure for transmitting the driving force of the wheels fixed to the support frames of the front wheels and the rear wheels to the other wheels, and transmitting them to the other wheels; And, it receives a hydraulic pressure generated from the power transmission device through a hydraulic pipe and includes a valve device for controlling the flow of the hydraulic pressure.

According to a preferred embodiment of the present invention, the power transmission device is moved left and right about the first rotation axis, the hydraulic motor or hydraulic pump equipped with a power transmission gear in the lower portion; An operation piece that contacts the side of the hydraulic motor or the hydraulic pump and moves the second rotational axis to the shaft in accordance with the driver's operation; It is fixed to the side of the hydraulic motor or the hydraulic pump is composed of a restoring spring for generating a restoring force on the hydraulic motor or hydraulic pump.

The present invention adds a simple device to a pre-fabricated front wheel or rear wheel drive vehicle so that the pre-fabricated front wheel or rear wheel drive vehicle can exert a four-wheel drive capability as needed.

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

1 is a view for showing a schematic power transmission of the four-wheel drive of the front wheel or rear wheel drive vehicle according to an embodiment of the present invention. 2 is a cross-sectional view for showing a gear wheel attached to the left and right wheels of the front and rear wheels of the vehicle according to the present invention. Figure 3 shows a cross-sectional view for showing another embodiment of a gear wheel attached to the left and right wheels of the front and rear wheels of the vehicle according to the present invention.

4 is a schematic diagram illustrating a case in which a power transmission device transmits power to a wheel in a four-wheel drive apparatus of a vehicle according to the present invention, and FIG. 5 is a four-wheel drive apparatus of a vehicle according to the present invention. A schematic diagram is shown for explaining the case where the power transmission device does not transmit power to the wheel. 6 is a hydraulic circuit diagram for explaining the operation of the valve device in the four-wheel drive of the vehicle according to the present invention.

As shown in FIG. 1, the four-wheel drive apparatus of the vehicle according to the present invention is a power transmission device to the left and right wheels 100a and 100b of the front wheel and the left and right wheels 100c and 100d of the rear wheel. 200a, 200b, 200c, and 200d are configured to be gear coupled. Each power transmission device 200a, 200b, 200c, 200d is connected via a hydraulic pipe 202 via the valve device 300. Here, the power transmission devices 200a, 200b, 200c, 200d are welded to the frames supporting the front wheels and the rear wheels or fixed using bolt nuts.

Here, the left and right wheels (100a, 100b, 100c, 100d) of the front wheel and rear wheel of the vehicle according to the present invention, as shown in Figure 2 and 3, a separate gear wheel 102 ) Is mounted. The gear wheel 102 is located between the brake drum 106 and the wheel 100 inside the left and right wheels 100a, 100b, 100c, and 100d of the front wheel and rear wheel, as shown in FIG. As shown in FIG. 3, the vehicle may be directly coupled to the wheel 100 in the case of a vehicle model that is not in the space of the wheel 100. The gear wheel 102 has a cylindrical shape with spur gears formed on its outer circumferential surface.

In addition, the gear wheels 102 attached to the left and right wheels 100a, 100b, 100c, and 100d of the front and rear wheels and the power transmission devices 200a, 200b, 200c, and 200d geared as necessary are shown in FIG. As described above, the power transmission gear 206 is mounted to the hydraulic motor or the hydraulic pump 204 which receives and rotates the hydraulic pressure through the hydraulic pipe 202.

Here, the four-wheel drive device according to the present invention is a power transmission device that is gear-coupled with the gear wheel 102 attached to the front wheel left and right wheels (100a, 100b) of the vehicle, if necessary, if the vehicle is a front drive mode (Front drive mode). The hydraulic pump 204 is built in the 200a and 200b, and if the vehicle is in rear drive mode, the gear wheel 102 attached to the front wheel left and right wheels 100 and 100b of the vehicle is geared as necessary. The hydraulic motor 204 is built into the power transmission devices 200a and 200b. Hereinafter, the present invention will be described using an all-wheel drive vehicle as an example.

The power transmission gear 206 is configured with a bevel gear to facilitate transmission of the rotational force of the hydraulic motor or the hydraulic pump 204 to the gear wheel 102 equipped with the spur gear. The hydraulic motor or the hydraulic pump 204 may be configured to move left and right about the first rotation shaft 205 so as to engage or space the power transmission gear 106 and the gear wheel 102 as necessary.

This is because the operation piece 210 connected to the driver's operation handle (not shown) and the flexible cable 212 moves the hydraulic motor or the hydraulic pump 204 around the second rotation shaft 208 to the gearwheel 102. This is because it is configured to be movable in the () direction. In addition, as shown in FIG. 5, the restoring spring 214 is mounted at one side of the hydraulic motor or the hydraulic pump 204 to allow the driver to separate the power transmission gear 206 from the gear wheel 102. In the case of moving), the hydraulic motor or the hydraulic pump 204 is moved by the restoring force of the restoring spring 214 so that the hydraulic motor or the hydraulic pump 204 and the gear wheel 102 are spaced apart.

In addition, the valve device 300 flows through the hydraulic pipe 202 connected between the power transmission devices 200a, 200b, 200c, and 200d geared to the left and right wheels 100a, 100b, 100c, and 100d of the front and rear wheels. It consists of a plurality of check valves 302a to 302b for preventing the back flow of hydraulic pressure and a plurality of oil valves 304a to 304h for opening and closing the flow of hydraulic pressure. The first oil valve 304a and the second oil valve 304b are interlocked among the plurality of oil valves 304a to 304h, the third oil valve 304c and the fourth oil valve 304d are interlocked, and the fifth oil valve 304a to 304h is interlocked. The oil valve 304e and the sixth oil valve 304f interlock with each other, and the seventh oil valve 304g and the eighth oil valve 304h interlock with each other. The valve device 300 appropriately controls the flow of hydraulic pressure according to the front wheel and rear wheel driving mode or the four wheel driving mode in the vehicle.

The detailed operation of the four-wheel drive apparatus of the front wheel or rear wheel drive vehicle according to the present invention configured as described above will be described with reference to FIGS. 1 to 6.

When the vehicle equipped with the four-wheel drive apparatus according to the present invention is a front wheel drive vehicle, the first oil valve 304a to the fourth oil valve 304d of FIG. It is open and the 5th oil valve 304e and the 6th oil valve 304f are closed. In this state, as shown in FIG. 5, the hydraulic motor or the hydraulic pump 204 is moved by the restoring force of the restoring spring 214 to move the hydraulic motor or the hydraulic pump 204 so that the hydraulic motor or the hydraulic pump 204 and the front wheel and The gear wheels 102 attached to the left and right wheels 100a, 100b, 100c, and 100d of the rear wheels are spaced apart. Thus, each wheel 100a, 100b, 100c, 100d is driven independently.

For example, in the case of a front wheel drive car, a driver lever installed at a predetermined position of the driver's seat when the driver needs four-wheel driving ability when there is no muddy road or ice road, that is, when both left and right wheels of the front wheel are driven. (Not shown), as shown in FIG. 6, the operating piece 210 connected to the flexible cable 212 is a hydraulic motor or a hydraulic pump around the second rotating shaft 208. Since the 204 is moved in the direction of the gear wheel 102, a hydraulic pump is engaged with the gear wheel 102 attached to the front wheel left and right wheels 100a and 100b, and the gear wheel attached to the rear wheel left and right wheels 100c and 100d. In 102, a hydraulic motor is engaged. At this time, the first oil valve 304a and the second oil valve 304b are opened and closed in order to prevent the backlash that may occur when the gear is engaged, so that the hydraulic motor 204 and the gear wheel 102 are smoothly connected to each other. To interlock. In addition, the third oil valve 304c and the fourth oil valve 304d are opened, the fifth oil valve 304e and the sixth oil valve 304f are closed, and the seventh oil valve 304g and the eighth oil are closed. The valve 304h is opened so that the gear wheel 102 attached to the left and right wheels 100a and 100b of the front wheel rotates so that the hydraulic pump engaged with the gear wheel 102 generates hydraulic pressure to the rear wheel left and right wheels 100c and 100d. The four-wheel drive is made by rotating the hydraulic motor engaged with the attached gear wheel 102.

When the driving force is transmitted to only one of the left and right wheels 100a and 100b of the front wheel when the vehicle is rotating, the first oil valve 304a and the first oil valve are required. The second oil valve 304b is closed, the third oil valve 304c and the fourth oil valve 304d are also closed, the fifth oil valve 304e and the sixth oil valve 304f are opened, and the seventh oil is opened. The valve 304g and the eighth oil valve 304h are closed, so that the gear wheel 102 attached to one of the left and right wheels 100a, 100b of the front wheel rotates and the hydraulic pump engaged with the gear wheel 102 is hydraulic. To generate a four-wheel drive by rotating the hydraulic motor engaged to the gear wheel 102 attached to the front and rear wheels (100c, 100d).

In addition, when the driver performs the four-wheel drive operation when the vehicle reverses, the first oil valve 304a and the second oil valve 304b, the third oil valve 304c and the fourth oil valve 304d and the fifth The oil valve 304e and the sixth oil valve 304f are closed, and the seventh oil valve 304g and the eighth oil valve 304h are opened so that the hydraulic pressure generated from the left and right wheels 100a and 100b of the front wheels are respectively opened. By rotating the hydraulic motor engaged to the gear wheel 102 attached to the rear wheel left and right wheels (100c, 100d) is a four-wheel drive.

Finally, the first oil valve 304a and the second when the driver of the vehicle requires four-wheel drive when driving force is transmitted only to one of the left and right wheels 100a and 100b of the front wheel at the time of reversing. The oil valve 304b is closed, and the third oil valve 304c and the fourth oil valve 304d are also closed. The fifth oil valve 304e and the sixth oil valve 304f are opened, and the seventh oil valve 304g and the eighth oil valve 304h are closed so that one of the left and right wheels 100a and 100b of the front wheel is closed. The hydraulic pump engaged with the gear wheel 102 by rotating the gear wheel 102 attached to the hydraulic pump generates hydraulic pressure to rotate the hydraulic motor engaged with the gear wheel 102 attached to the front and rear wheels left and right wheels 100c and 100d. Four-wheel drive reverses.

In other words, in the case of a vehicle in which both the left and right wheels 100a and 100b of the front wheel are driven, the left and right wheels 100a and 100b of the front wheel rotate while the driver performs four-wheel driving. The hydraulic pump 204 attached to the left and right wheels generates hydraulic pressure, and the generated hydraulic pressure is connected to the third oil valve 304c, the fourth oil valve 304d, and the seventh oil valve 304g through the hydraulic pipe 204. The oil pressure is transmitted to the hydraulic motor 204 attached to the left and right wheels 100c and 100d of the rear wheel through the valve device 300 in which the fourth oil valve 304h is opened. Therefore, the hydraulic motor generated by the hydraulic pump 204 while the left and right wheels 100a and 100b of the front wheel rotates is attached to the left and right wheels 100c and 100d of the rear wheel through the hydraulic pipe 204. Rotating 204 causes all four wheels of the vehicle to rotate.

In the case where the driver intends to drive the four wheels at the time of reversing, the seventh oil valve 304g and the eighth oil valve 304h are opened by operating the lever (not shown). Therefore, the oil pressure generated by the hydraulic motor 200a attached to the right wheel of the front wheel is driven and recovered by driving the hydraulic motor 200d attached to the left wheel of the rear wheel through the seventh oil valve 304g. Similarly, the oil pressure generated by the hydraulic motor 200b attached to the left wheel of the front wheel drives and recovers the hydraulic motor 200c attached to the right wheel of the rear wheel through the eighth oil valve 304h.

In the case of a rear wheel drive car, the above operation is possible by converting the hydraulic pump and the motor.

The four-wheel drive device of the present invention adds a simple and easy to manufacture hydraulic device to the existing vehicle to exhibit excellent four-wheel drive ability under the bad conditions such as ice roads, muddy roads.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited thereto and may be improved or modified by those skilled in the art within the scope of the technical idea of the present invention.

Claims (4)

A gear wheel integrally formed inside the left and right wheels 100a and 100b of the front wheel and the left and right wheels 100c and 100d of the rear wheel; A power transmission device (200a, 200b, 200c, 200d) for generating a hydraulic pressure for transmitting the driving force of the wheel, which is coupled to the gear wheel and fixed to the support frames of the front wheel and the rear wheel and driven to another wheel, ; In addition, the four-wheel drive device of the vehicle including a valve device 300 for controlling the flow of the hydraulic pressure by receiving the hydraulic pressure generated in the power transmission device (200a, 200b, 200c, 200d) through the hydraulic pipe 202. . The hydraulic motor or hydraulic pressure of claim 1, wherein the power transmission devices 200a, 200b, 200c, and 200d are moved left and right about the first rotation shaft 205, and the power transmission gear 206 is mounted at the bottom thereof. Pump 204; An operation piece 210 which is in contact with the side surface of the hydraulic motor or the hydraulic pump 204 and moves the second rotation shaft 208 left and right in an axis according to the lever operation of the driver; The four-wheel drive device of the vehicle, characterized in that consisting of a restoring spring (214) is fixed to the side of the hydraulic motor or hydraulic pump (204) for generating a restoring force on the hydraulic motor or hydraulic pump (204). According to claim 2, wherein the power transmission device (200a, 200b, 200c, 200d) is a four-wheel drive device of the vehicle, characterized in that the hydraulic pump is installed on the front wheel of the front wheel drive vehicle is installed on the rear wheel. . According to claim 1, wherein the valve device 300 comprises a plurality of oil valves (304a ~ 302h) for transmitting the driving force of the front wheel or rear wheel of the power transmission device to another wheel; And a plurality of check valves (302a to 302b) for preventing back flow of hydraulic pressure.