KR20080036768A - Oil flow preventing device of motor - Google Patents

Abstract

An oil flow preventing device of a motor is provided to prevent a damage of the motor due to introduction of oil into the inside of the motor or an error due to an electric leakage. An oil flow preventing device of a motor is used for an antilock brake system including a pump and the motor. The pump supplies oil to a hydraulic brake so as to control a braking pressure. The motor drives the pump. A needle bearing is installed on a front end of a rotary shaft(72). The rotary shaft is rotatably supported on a bearing(74) installed in a housing(71) of the motor. A sealing member(80) is inserted into the rotary shaft. The sealing member is positioned between the bearing and the needle bearing. The rotary shaft of the motor includes a stopper(78) which is installed between the bearing and the needle bearing, and blocks excessive movement of the needle bearing.

Description

Oil Flow Blocker of Motor {OIL FLOW PREVENTING DEVICE OF MOTOR}

1 is a partial cutaway cross-sectional view of a portion of an antilock brake system according to the prior art;

2 is a partial cutaway sectional view showing a part of an anti-lock brake system to which an oil leakage blocking device of a motor according to the present invention is applied.

Figure 3 (a) and (b) is an enlarged view of the portion A of the oil leakage blocking device of the motor closed and open state.

Figure 4 is a cross-sectional view of the air inside the expansion of the anti-lock brake system to which the oil leakage blocking device of the motor according to another embodiment of the present invention is applied.

Figure 5 (a) and (b) is an enlarged view of the portion B of the oil leakage blocking device of the motor closed and open state.

6 is a cross-sectional view showing a part of an anti-lock brake system to which an oil leakage blocking device of a motor according to another embodiment of the present invention is applied.

7 is a sectional view showing a part of an oil leakage blocking device of a motor according to another embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

60: modulator block 65: connecting shaft

70: motor 71: housing

72: rotating shaft 72a: eccentric portion

74: bearing 76: needle bearing

78: stopper 80: sealing member

82: first disk 84: second disk

The present invention relates to an oil inlet blocking device for a motor, and more particularly, to an oil inlet blocking device for a motor to block a flow path of oil flowing into a motor.

In general, a vehicle is provided with a brake device for braking the front wheel and the rear wheel, and such a brake device is largely classified into pneumatic or hydraulic according to a working medium generating a braking force.

For example, a vehicle that generates hydraulic braking force is equipped with a hydraulic brake, a power booster for forming and transmitting a braking hydraulic pressure to the hydraulic brake side, and a master cylinder. Therefore, when the driver presses the brake pedal, a braking hydraulic pressure is formed, and the braking hydraulic pressure is transmitted to the hydraulic brake to generate a braking force.

In such a vehicle, when the driver presses the brake pedal to control the increase / maintained braking force, if the braking pressure is greater than the road surface state, or the friction force of the hydraulic brake is greater than the braking force generated from the tire or the road surface, the tire slips on the road surface. Slip phenomenon occurs.

Anti-lock Break System (ABS) was developed to effectively prevent such slip phenomenon and obtain strong and stable braking force.

The anti-lock brake system includes a modulator block installed with a plurality of solenoid valves, an accumulator, and a pair of pumps for controlling braking hydraulic pressure transmitted to the hydraulic brake side, and mounted to cover one side of the modulator block and electrically operated. ECU and a motor coupled to the other side of the modulator block to drive a pair of pumps at the same time.

1 is a partial cutaway cross-sectional view of a portion of an antilock brake system according to the prior art.

The motor 20 is installed on one side of the modulator block 10, and a rotating shaft 22 for transmitting rotational force extends to the modulator block 10. The rotating shaft 22 is supported by a bearing 24 installed in the motor 20. In addition, the front end of the rotating shaft 22 is composed of an eccentric portion (22a), the needle bearing 26 is provided at its end.

On the other hand, a pair of pumps (not shown) installed inside the modulator block 10 pressurizes the oil in the low pressure accumulator and supplies it to the high pressure accumulator.

The antilock brake system described above may leak a small amount of oil in the process of pumping oil in the modulator block 10.

However, the anti-lock brake system according to the prior art does not have a structure for preventing the oil introduced from the modulator block from entering the motor. Accordingly, the oil leaked from the modulator block 10 may flow into the motor 20 through the gap of the bearing 24, and thus, the inside of the motor 20 may be electrically energized to generate an overcurrent. In this case, the motor 20 may be deteriorated, and the ECU of the anti-lock brake system may malfunction or be damaged.

The present invention is to solve the above-mentioned problems of the prior art, to block the flow path that can be introduced into the motor to block the oil that can be exposed during operation of the pump of the modulator block to the motor through the gap of the bearing It is to provide an oil inlet blocking device of the motor.

In order to achieve the above object, the oil inlet blocking device of a motor according to the present invention is used in an anti-lock brake system having a pump for supplying oil to control a braking pressure to a hydraulic brake, and a motor for driving the pump. An oil inflow blocking device of a motor, wherein the motor has a needle bearing installed at the tip of the rotating shaft, the rotating shaft being rotatably supported by a bearing installed in the housing of the motor, inserted into the rotating shaft, and the bearing and the needle bearing. It includes a sealing member located between.

In addition, the rotation shaft of the motor may include a stopper installed between the bearing and the needle bearing to block the excessive movement of the needle bearing. Here, the sealing member may be installed on the inner end of the stopper may include an oil lip in close contact with the outer diameter of the rotating shaft. In addition, the sealing member may be installed on the outer end of the stopper may include a pad portion that is in close contact when the needle bearing is pressed.

The sealing member may include a first disk installed on a rotating shaft of the motor and a second disk installed on the housing, and each end portion of the first disk and the second disk may overlap each other with a predetermined length. . In addition, the rigidity of the first disk is preferably greater than the rigidity of the second disk.

In addition, the sealing member may be installed between the bearing and the needle bearing, and may include a disk having a size corresponding to the side surface of the bearing. The disk may be installed to be movable along the shaft by being fitted to the rotation shaft.

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

Figure 2 is a partial cutaway cross-sectional view showing a part of the anti-lock brake system to which the oil leakage blocking device of the motor according to the present invention is applied, Figure 3 (a) and (b) is a state in which the oil leakage blocking device of the motor is closed An enlarged view of part A in the open state.

In the vehicle anti-lock brake system to which the present invention is applied, as illustrated in FIGS. 2 and 3, a modulator block (60) provided with a plurality of solenoid valves, an accumulator, and a pair of pumps for controlling the braking hydraulic pressure delivered to the hydraulic brake side is provided. ), An ECU mounted to cover one side of the modulator block 60 and controlling an electrically operated component, and a motor 70 coupled to the other side of the modulator block 60 to simultaneously drive a pair of pumps. ).

Here, the modulator block 60 is a block formed in the shape of an aluminum rectangular parallelepiped, and a plurality of solenoid valves connected to upstream and downstream sides of the hydraulic brake are disposed therein to control the braking hydraulic pressure delivered to the hydraulic brake side. At this time, the opening and closing operation of the solenoid valve is controlled by the ECU according to the vehicle speed detected by the wheel sensor disposed on the front wheel and the rear wheel.

On the other hand, the motor 70 may be formed of a general DC motor, the rotating shaft 72 of the extension of the modulator block 60. The rotating shaft 72 is rotatably supported by being coupled to a bearing 74 fixed by a housing of the motor 70.

In addition, an end portion of the rotation shaft 72 is provided with an eccentric portion (72a), the needle bearing 76 is coupled to the eccentric portion (72a). In addition, the needle bearing 76 reciprocates in the modulator block 60 and is connected to a pair of pumps that pressurize oil in the low pressure accumulator and supply it to the high pressure accumulator. At this time, the rotary shaft 72 of the motor 70 may be installed so as to move the needle bearing 74 at a predetermined clearance for smooth connection with the pump. In addition, a stopper 78 is interposed between the bearing 74 and the needle bearing 76 on the rotation shaft 72. The stopper 78 is installed in the housing 71 of the motor 70, and prevents the needle bearing 76 from escaping toward the motor 70.

On the other hand, when the rotating shaft 72 is rotated in accordance with the driving of the motor 70, the connecting shaft 65 of the pump reciprocates with respect to the eccentric amount of the eccentric portion 72a to pump the oil.

As such, some of the oil may leak during operation of the pump, and the sealing member 80 is installed between the motor 70 and the needle bearing 76 to block the leaked oil. do.

The sealing member 80 is installed on the rotary shaft 72 of the motor 70, the first disk 82 to rotate in conjunction with the rotary shaft 72, and the second disk fixed to the housing 71 ( 84).

The end portions of the first disk 82 and the second disk 84 overlap each other with a predetermined length. At this time, a predetermined gap is formed between the first disk 82 and the second disk 84. Therefore, during the initial rotation of the motor 70, the first disk 82 and the second disk 84 is rotated without contact with each other, thereby not restraining the rotation of the motor 70. .

On the other hand, the first disk 82 and the second disk 84 is in the form of a thin plate. In addition, the stiffness of the first disk 82 and the second disk 84 are different from each other, preferably, the stiffness of the first disk 82 is greater than that of the second disk 84. Is formed larger.

Therefore, as shown in FIG. 3A, when the air inside the motor 70 contracts, the second disk 84 is bent inward more than the first disk 82 to close the gap. . The oil inlet blocking device of the motor 70 configured as described above, in principle, blocks the inflow of oil introduced from the pump.

On the contrary, as shown in (b) of FIG. 3, when the air inside the motor 70 expands due to the continuous rotation of the motor 70, the second disk 84 causes the first disk to expand according to the expansion pressure. Bend out more than the disk 82, the air inside is discharged outward.

Figure 4 is a cross-sectional view of the internal air of the anti-lock brake system to which the oil leakage blocking device of the motor is applied according to another embodiment of the present invention, Figure 5 (a) and (b) is the oil leakage blocking of the motor An enlarged view of part B in the closed and open state of the device.

4 and 5, the sealing member may be formed of one disk 180 coupled to the rotation shaft 72 of the motor 70. The disk 180 is installed between the bearing 74 and the needle bearing 76. At this time, the disk 180 is maintained independent of the bearing 74 and the needle bearing 76 does not restrain the rotation of the rotary shaft 72 of the motor 70.

In addition, the disk 180 is formed to have a size corresponding to the side surface of the bearing 74, so that when the disk 180 is in close contact with the bearing 74, the gap between the bearing 74 is formed. Completely covered.

In addition, the disk 180 is installed to be moved a predetermined distance along the rotation shaft 72 in a state coupled to the rotation shaft 72.

On the other hand, as shown in Figure 5 (a), when the air inside the expansion as the motor 70 rotates, the disk 180 is spaced apart from the bearing 74 by a predetermined distance. As such, when the disk 180 is spaced apart from the bearing 74, a predetermined flow path is formed therebetween, and air in the motor 70 is discharged to the outside through the flow path.

On the contrary, as shown in (b) of FIG. 5, when the air inside the motor 70 contracts, the disk 180 is in close contact with the bearing 74 and the gap between the bearings 74 is completely closed. Will be blocked.

At this time, the oil flowing out of the pump is discharged to the first discharge passage 182 formed therein along the surface of the disk 180. The oil discharged to the first discharge passage 182 is discharged to the outside through the second discharge passage 184 formed on the front surface of the motor housing 71.

6 is a cross-sectional view showing a part of an anti-lock brake system to which an oil leakage blocking device of a motor according to another embodiment of the present invention is applied. In addition, Figure 7 is a cross-sectional view showing a part of the oil leakage blocking device of the motor according to another embodiment of the present invention.

6 and 7, the sealing member is made of a rubber material, and preferably, may be made of an oil lip 280 formed at an inner end of the stopper 78. The oil lip 280 is in close contact with the outer diameter of the rotary shaft 72, thereby blocking the oil flowing out of the pump flows into the motor 70.

In addition, a pad portion 282 is formed at an outer end of the stopper 78. The pad part 282 may be formed of a rubber material, and the pad part 282 may be in close contact when the needle bearing 76 is compressed and may reduce noise.

As described above with reference to the illustrated oil inlet blocking device of the motor according to the present invention, the present invention is not limited by the embodiments and drawings described above, the present invention within the claims Of course, various modifications and variations can be made by those skilled in the art.

The oil inlet blocking device of the motor according to the present invention configured as described above is blocked between the bearing supporting the rotating shaft of the motor and the needle bearing to prevent the oil spilled into the motor through the bearing during operation of the pump. In this way, it is possible to prevent a malfunction of the motor due to damage or short circuit that may occur when oil enters the motor.

Claims (8)

An oil inlet blocking device for a motor used in an anti-lock brake system having a pump for supplying oil to control a braking pressure to a hydraulic brake, and a motor for driving the pump, The motor is provided with a needle bearing at the tip of the rotating shaft, The rotating shaft is rotatably supported by a bearing installed in the housing of the motor, And a sealing member inserted into the rotating shaft and positioned between the bearing and the needle bearing. The method according to claim 1, The oil inlet blocking device of the motor, characterized in that it comprises a stopper installed between the bearing and the needle bearing to block the overtravel of the needle bearing. The method according to claim 2, The sealing member is installed on the inner end of the stopper oil inlet blocker of the motor comprising an oil lip in close contact with the outer diameter of the rotating shaft. The method according to claim 3, The sealing member is installed on the outer end of the stopper oil inlet blocking device of the motor, characterized in that it comprises a pad portion that is in close contact with the pressing of the needle bearing. The method according to claim 1 or 2, The sealing member and the first disk installed on the rotating shaft of the motor, A second disk installed in the housing, The oil inlet blocking device of the motor, characterized in that the end portion of the first disc and the second disc overlap each other with a predetermined length. The method according to claim 5, The stiffness of the first disk is greater than the stiffness of the second disk oil inlet blocking device, characterized in that formed. The method according to claim 1 or 2, The sealing member is installed between the bearing and the needle bearing, the oil inlet blocking device of the motor, characterized in that it comprises a disk of a size corresponding to the side of the bearing. The method according to claim 7, And the disk is installed on the rotating shaft so as to be movable along the shaft.

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