KR20060071280A - Apparatus for limiting differential gear using electromagnet - Google Patents

Abstract

An object of the present invention is to provide a differential limiting device using an electromagnet which can effectively limit the differential device by installing an electromagnet in a differential case of a vehicle and supplying a current to the electromagnet as necessary to increase the frictional force in the differential case. There is this.

Differential limiting apparatus using an electromagnet according to the present invention for achieving the above object, the drive pinion connected to the engine is engaged with a ring gear installed integrally with the differential case, a pair of a predetermined distance inside the differential case. A differential pinion is rotatably installed, and a pair of side gears are engaged with left and right sides of the differential pinion, and the pair of side gears are splined to propulsion shafts connected to both driving wheels, respectively. In the differential limiting device having a built-in shock between the inner surfaces of the differential case, the front of the pair of side gears are installed so that the electromagnets face each other, the electromagnets are mutually repulsive by the current supplied from the battery of the vehicle The rear side of the side gear is designed to be in close contact with the inner surface of the differential case All.

Differential Device, Electromagnet, Battery, Current Controller, Current Supply

Description

Apparatus for limiting differential gear using electromagnet}

1 is a front view showing a typical differential device.

2 is a schematic diagram showing a general differential device;

Figure 3 is a schematic diagram showing a differential limiting device according to the present invention.

Figure 4 is an operating state of the differential limiting device according to the present invention.

※ Explanation of symbols about main part of drawing ※

1: engine 2: transmission

3: driven pinion 4: ring gear

5: propulsion shaft 6: drive wheel

10: differential case 11: pinion shaft

12: differential pinion 13: side gear

14: shim 20: electromagnet

21: current supply 22: current controller

23: battery

The present invention relates to a differential limiting apparatus using an electromagnet, and more particularly, by installing an electromagnet in a differential case of a vehicle and supplying a current to the electromagnet as necessary to increase the frictional force in the differential case so as to limit the differential apparatus. It relates to a differential limiting device using the provided electromagnet.

As a device that transmits the power generated by the engine to the drive wheels, there are a clutch, a transmission, a differential gear, and a drive shaft, among which the differential is connected to the inside when the vehicle rotates. It is a device that makes the rotation smoothly by changing the number of rotation of the outer wheel.

When the vehicle is traveling, it not only travels in a straight course, but also turns left and right. If the left and right wheels are combined in one axle, the outer wheel travels more than the inner wheels when turning. Therefore, assuming that there are no slips on the wheels and the road surface, the outer wheels rotate more than the inner wheels, causing torsion. To eliminate this torsion, the propulsion shaft should be divided into two left and right to make a mechanism in which the outer propulsion shaft rotates more than the inner propulsion shaft when changing direction. This mechanism is a differential device.

1 and 2 will be described the structure and operation of the general differential device. First, the drive pinion 3 connected to the engine 1 and the transmission 2 is engaged with the ring gear 4 provided on one side of the differential case 10. Inside the differential case 10, a pair of differential pinions 12 are provided on the rotatably mounted pinion shaft 11 at a predetermined distance up and down, and a pair of sides on the left and right sides of the differential pinion 12. The gear 13 is engaged in a bevel shape. The central portion of the side gear 13 is splined to the propulsion shaft 5 connected to both driving wheels 6, respectively. The differential case 10 and the ring gear 4 are integrated so that the power generated by the engine 1 is driven by the drive pinion 3, the ring gear 4, the differential case 10, the differential pinion 12, and the side gear. (13), the propulsion shaft (5) and the drive wheel (6) in order.

Briefly describing the operation of the differential device configured as described above, when the driving pinion 3 is rotated when the vehicle is traveling in a straight line, the differential pinion 12 is not rotated and only the left and right side gears 13 are driven. 3) and the differential case 10 is integrally rotated. On the other hand, when the vehicle is traveling in a curve, a large resistance force is applied to either of the left and right driving wheels 6, and at this time, the differential pinion 12 rotates around the pinion shaft 11 and simultaneously The revolution of the circumference is continued so that the rotational speed of the side gear 13 can be changed so that the vehicle can turn smoothly.

While the above-mentioned differential device is essential for curve driving, when one wheel falls into a bog while driving, almost no frictional resistance is applied, so when the differential is activated, no power is transmitted to the wheel on the road side. Only the missing wheel will run idle and you will not be able to drive. At this time, if you stop the differential, you can easily escape the quake. To this end, each vehicle is equipped with a limited slip differential (LSD). As shown in FIG. 2, the differential limiting device includes a fin 14 between the rear surface of the side gear 13 and the inner surface of the differential case 10. When the differential pinion 12 and the side gear 13 are engaged, a force pushing the side gear 13 simultaneously occurs, so that the rear face of the side gear 13 and the inner surface of the differential case 10 with the pin 14 interposed therebetween. Friction (dip internal friction) occurs between the two wheels, resulting in a torque change of the left and right wheels.

However, the deep internal frictional force of this differential limiting device is so small that it can only be released when one wheel falls into a small bog. Therefore, there is a demand for the development of a device capable of improving the differential limiting capability of the vehicle by increasing the internal frictional force described above.

The present invention has been proposed to meet the demands, by providing an electromagnet on the propulsion shaft in the differential case of the vehicle, when the differential restriction is required by supplying a current to the electromagnet to increase the internal frictional force of the vehicle, stability of the stability The purpose is to provide a differential limiting device that can improve the performance of the system.

In addition, it is another object to control the differential limit more precisely by controlling the amount of internal frictional force by controlling the amount of current supplied to the electromagnet.

Differential limiting apparatus using an electromagnet according to the present invention for achieving the above object, the drive pinion connected to the engine is engaged with a ring gear installed integrally with the differential case, a pair of a predetermined distance inside the differential case. A differential pinion is rotatably installed, and a pair of side gears are engaged with left and right sides of the differential pinion, and the pair of side gears are splined to propulsion shafts connected to both driving wheels, respectively. In the differential limiting device having a built-in shock between the inner surfaces of the differential case, the front of the pair of side gears are installed so that the electromagnets face each other, the electromagnets are mutually repulsive by the current supplied from the battery of the vehicle The rear side of the side gear is configured to be in close contact with the inner surface of the differential case through the 씸. The.

In addition, a current controller is installed on the circuit connecting the electromagnet and the battery to control the amount of current supplied to the electromagnet.

In addition, on the circuit connecting the electromagnet and the battery is provided a current supply having a slip ring structure and fixed to the propulsion shaft.

Hereinafter, a differential limiting apparatus using an electromagnet according to the present invention will be described in detail with reference to the accompanying drawings. Figure 3 is a schematic diagram showing a differential limiting device according to the present invention, Figure 4 is an operating state diagram.

As shown in FIG. 3, the differential limiting apparatus using an electromagnet according to the present invention engages with a ring gear 4 in which a drive pinion 3 connected to an engine 1 is integrally installed with a differential case 10, and the differential case. The pinion shaft 11 is rotatably installed up and down in the interior of the 10, and a pair of differential pinions 12 are rotatably installed at a predetermined distance on the pinion shaft 11. To the left and right of the differential pinion 12, a pair of side gears 13 are engaged in a bevel engagement form, and the pair of side gears 13 are respectively splined to propulsion shafts 5 connected to both drive wheels 6; Combined.

A shock absorber 14 is embedded between the rear surface of the side gear 13 and the inner surface of the differential case 10, and the shock absorber 14 is rotated by engaging the side gear 13 by the differential pinion 12. The pushing force causes friction to occur on the rear surface of the side gear 13 and the inner surface of the differential case 10. The configuration as described above is the same as the conventional differential limiting apparatus described above with reference to Figs.

According to the present invention, the electromagnet 20 is installed to face each other on the front side of the pair of side gears 13. The electromagnet 20 is connected to the battery 23 of the vehicle, and coils are wound in opposite directions so that when the current is supplied from the battery 23, mutual repulsive force acts according to Fleming's right hand law. This repulsive force is conventionally combined with the pushing force generated when the differential pinion 12 is engaged with the side gear 13 so that the pin 14 embedded in the rear side of the side gear 13 is further provided on the inner surface of the differential case 10. Make sure it's tight.

On the other hand, the current controller 22 is preferably installed on the circuit connecting the electromagnet 20 and the battery 23 to control the amount of current supplied to the electromagnet 20. Because, even when it is necessary to limit the differential, the degree of limiting the differential according to the magnitude of the difference in frictional resistance of both driving wheels, that is, the back of the side gear 13 and the differential case (10) via the wheel (14). This is because it is necessary to adjust the magnitude of the deep internal frictional force generated between the inner surfaces of the).

For example, if the bogged wheels are completely lifted from the road surface and there is no frictional resistance with the road surface, a large deep internal friction force must be generated, whereas if there is friction resistance due to some contact with the road surface, a small deep internal friction force is required. Shall be. The electromagnet 20 may also control the internal friction force by adjusting the repulsive force acting on each other depending on the amount of current supplied. The current controller 22 performing this function is, for example, an internal resistance by a control signal transmitted by an electronic control unit (ECU) or a separately mounted control unit according to information input from each driving wheel 6. It may be a variable resistor whose value is changed.

On the other hand, the current supply 21 may also be installed on a circuit connecting the electromagnet 20 and the battery 23. The current supply 21 has a slip ring structure and is fixed to the propulsion shaft 5 and is connected to the electromagnet 20 through the inner center of the propulsion shaft 5. The slip ring contacts the terminal as it slides, allowing the rotor to continue to supply electricity. Therefore, the current supply 21 having the slip ring structure allows the wires connected to the battery 23 to continue to supply electricity without being twisted by the propulsion shaft 5 which is the rotating body.

The differential limiting device according to the present invention configured as described above operates as follows. As shown in FIG. 4, when a current is supplied from the battery to the electromagnet 20 via a current controller, a current supply, or the like, current is supplied to the electromagnet 20 facing each other in the A direction, and thus a magnetic field generated by Fleming's right hand law. Is reversed. Therefore, the same polarity is induced on the side facing each other, and as a result, the repulsive force in the B direction is applied. This pushes the side gear 13 toward the inner surface of the differential case, respectively, so that the rear surface of the side gear 13 and the inner surface of the differential case are closely contacted with each other by means of a built-in pin 14 therebetween, increasing the internal friction of the deep. Will be done.                     

In the case of the conventional differential limiter, the size of the deep internal frictional force may vary slightly depending on the input conditions when used as a reference for medium and large vehicles, but the engine input torque is about 100 km / H when driving to drive on the asphalt road surface. It is about 80 to 90 Nm, and the deep internal friction is about 15 Nm. Even if the internal frictional force is such a slight disturbance from the wheels due to the unevenness during straight driving, the differential device is operated, causing the vehicle to vibrate in the uneven direction.

On the other hand, when the deep internal frictional force is increased by using an electromagnet, the deep internal frictional force of about 30 to 50 Nm may be generated. This level of internal friction can absorb most of the external forces coming from the wheels when driving on snow-covered asphalt roads at 100 km / H. In addition, when the internal frictional power is increased by using an electromagnet, constant internal frictional power is generated even without a driving engine input torque, so that linear stability in a small uneven furnace is improved when there is no driving input.

On the other hand, even when driving on the curve, if the internal frictional force increases, the driving force is added to the wheels in the turning direction as much as the internal frictional force, so that the vehicle is directed toward the understeer and the turning stability is improved as a result.

As described above, according to the differential limiting apparatus using the electromagnet according to the present invention, since the internal frictional force in the differential case is increased regardless of the driving input of the engine, the linear stability and the turning stability of the vehicle can be further improved.

Claims (3)

The drive pinion 3 connected to the engine 1 is engaged with the ring gear 4 installed integrally with the differential case 10, and the pair of differential pinions 12 are spaced at a predetermined distance inside the differential case 10. ) Is rotatably installed, and a pair of side gears 13 are engaged with the left and right sides of the differential pinion 12, and the pair of side gears 13 are connected to both driving wheels 6 and the propulsion shaft 5. In the differential limiting device which is spline-coupled to each other and has a fin 14 built in between the rear surface of the side gear 13 and the inner surface of the differential case 10, The pair of side gears 13 are provided so that the electromagnets 20 face each other, and the electromagnets 20 are mutually repulsed by a current supplied from the battery 23 of the vehicle so that the side gears 13 The back of the) is a differential limiting device using an electromagnet, characterized in that configured to be in close contact with the inner surface of the differential case (10) via the pin (14). According to claim 1, wherein the current controller 22 is installed on the circuit connecting the electromagnet 20 and the battery 23 to control the amount of current supplied to the electromagnet 20 using an electromagnet Differential limiting device. According to claim 1 or 2, characterized in that the current supply 21 which is fixed to the propulsion shaft 5 has a slip ring structure on the circuit connecting the electromagnet 20 and the battery 23 is installed. Differential limiter using electromagnet.

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