KR20200055947A - Electro vacuum pump - Google Patents

Abstract

The present invention provides an electric vacuum pump capable of reducing generated noise and preventing moisture flowing from the outside into a pump module. The electric vacuum pump comprises: a motor housing supporting a motor providing a driving force by a power applied from the outside; a pump module having a rotor rotatably coupled to a rotor shaft combined to the motor, a vane removably coupled to the rotor, a cam ring in contact with an end of the vane, and a side plate coupled to the cam ring to accommodate the rotor and the vane, and coupled to the motor housing to be able to pressurize and discharge intake air; a pump cover accommodating the pump module and having a cover rib protruding from the inside toward the pump module to be coupled to the motor housing; and a cover rubber member having one side coupled to the cover rib and the other side having a skirt supported by the side plate.

Description

Electric vacuum pump {ELECTRO VACUUM PUMP}

The present invention relates to an electric vacuum pump, and more particularly, to an electric vacuum pump having an improved structure so as to reduce noise between the pump module and the pump cover and to block moisture flowing from the outside during rest.

Automobiles are the representative modern transportation means by combining many parts. Such automobiles typically use a braking device for the driver to stop the vehicle. The braking device is composed of an operating mechanism that increases and transmits the operator's operating force using a link or hydraulic pressure, and a body that receives the force and generates braking force. Among them, the double brake uses vacuum or compressed air to lighten the operating force.

The vacuum pump used to assist the braking force while being used in the braking system is divided into that driven by an engine or the like and driven by a motor. 2. Description of the Related Art Recently, electric vacuum pumps driven by electric motors have been increasing in consideration of economical efficiency when applied to small vehicles.

In an electric vacuum pump, a proposal for reducing noise is attempted as in a conventional pump, and prior art related to this prior art is disclosed in Korean Patent Publication No. 10-1530568 (2015.06.22).

However, in the prior art, a structure for reducing noise is complicated, and in one configuration, a structure in which noise introduced from the outside does not flow into a vane or the like is desirable.

An object of the present invention is to provide an electric vacuum pump capable of reducing noise generated.

Another object of the present invention, to provide an electric vacuum pump that can prevent the moisture contained in the air flowing back to the pump module from the outside when entering the vane of the pump module.

An object of the present invention, an electric vacuum pump, the motor housing for supporting a motor that provides a driving force by a power applied from the outside; A rotor rotatably coupled to a rotor shaft coupled to the motor, a vane rotatably coupled to the rotor, a cam ring in contact with an end of the vane, and coupled to the cam ring to accommodate the rotor and the vane A pump module provided with a side plate and coupled to the motor housing so as to discharge the pressurized air; A pump cover accommodating the pump module and having a cover rib protruding from the inside toward the pump module to be coupled to the motor housing; One side is coupled to the cover rib and the other side is achieved by an electric vacuum pump comprising a; a cover rubber member having a skirt supported by the side plate.

In addition, the cover rib has a plurality of rib slots formed in a radially divided and formed width along the circumference, and the cover rib is formed with a rubber member engaging jaw recessed in the outer circumferential plate so that the cover rubber member can be coupled. It is preferred that the cover rubber member is coupled to the rubber member engaging jaw to partially close the rib slot to form a cover rib rubber gap that guides the flow of air.

In addition, the cover rubber member is provided with an intermediate plate having an intermediate hole penetrating through a central region in a plate shape crossing the skirt in the shape of a hollow band, and the cross-sectional area of the intermediate hole is preferably larger than the cross-sectional area of the cover rib rubber gap. Do.

In addition, the cover rubber member further comprises a lower rib extending from the intermediate plate to a length smaller than the skirt from the intermediate plate toward the side plate in the shape of a hollow belt having a diameter larger than the intermediate hole, and the intermediate plate comprises the motor It is preferable that elastic deformation is provided in the process of stopping the air and flowing backward from the discharge port to the pump module so that the lower rib is in close contact with the side plate and the reverse flowed air does not flow into the vane side.

In addition, the cover rubber member is coupled to the pump cover, and includes an intermediate plate having an intermediate hole penetrated into the central region of the plate-shaped crossing the hollow skirt, and having a larger diameter than the intermediate hole. The cylindrical plate has a lower rib extending from the intermediate plate toward the side plate and having a length smaller than the skirt, and the intermediate plate is elastically deformed in the process in which the motor stops and air flows from the outlet to the pump module. It is preferable that the lower rib is in close contact with the side plate so that the reverse flow air does not flow into the vane side.

In addition, the side plate is formed with a discharge hole through which compressed air is discharged from the pump module, and the discharge hole is preferably located radially outward from the rotor shaft than the lower rib.

In addition, it is preferable to include a plate hole formed through the center of the side plate.

According to the present invention, it is possible to provide an electric vacuum pump capable of reducing noise by changing the volume or the area of the area in which the air is received in multiple stages in the process of discharging air.

In addition, it is possible to provide an electric vacuum pump that can prevent the moisture contained in the air flowing back to the pump module from outside when entering the vane of the pump module.

1 is an exploded perspective view of an electric vacuum pump according to an embodiment of the present invention,
Figure 2a is a perspective view and a cross-sectional view of the cover rubber member,
Figure 2b is a perspective view and a cross-sectional view of the pump cover,
Figure 3 is a cross-sectional view showing a state in which the cover rubber member is coupled between the pump cover and the side plate,
Figures 4a and 4b is a cross-sectional view and a table for explaining the volume change in the process in which the pressurized air sucked from the inlet according to the invention is guided to the outlet,
Figure 4c is a cross-sectional view for explaining a process that can prevent the moisture flowing into the pump module from the discharge port when the motor is stopped,
5A and 5B are graphs for comparing and explaining noise generated in the electric vacuum pump according to the prior art and the present invention.

The electric vacuum pump 100 capable of preventing noise from entering the pump module at the same time as noise reduction according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5B.

Figure 1 is an exploded perspective view of an electric vacuum pump according to an embodiment of the present invention, Figure 2a is a perspective view and a cross-sectional view of the cover rubber member, Figure 2b is a perspective view and a cross-sectional view of the pump cover, Figure 3 is a pump cover and a side plate It is a cross-sectional view showing a state in which the cover rubber member is coupled, and FIGS. 4A and 4B are cross-sectional views and tables for explaining the volume change in the process in which the pressurized air sucked from the suction port according to the present invention is guided to the discharge port, Figure 4c is a cross-sectional view for explaining a process that can prevent the moisture entering the pump module from the discharge port when the motor is stopped, Figures 5a and 5b is a comparative description of the noise generated in the prior art and the electric vacuum pump according to the present invention It is a graph to do.

The electric vacuum pump 100 is coupled to the inside of the vehicle and provides vacuum pressure to a booster or the like to improve the braking ability of the vehicle. The electric vacuum pump 100 includes a motor housing 110 supporting a motor 111 that provides a driving force by a power applied from the outside; The rotor 131 is rotatably coupled to the rotor shaft 111a coupled with the motor 111, a vane 133 coupled to the rotor 131 for access, and an end portion of the vane 133. It is provided with a cam ring 135 in contact with the cam ring 135 and a side plate 137 accommodating the rotor 131 and the vane 133 to press the inhaled air to discharge the motor housing to be discharged. A pump module 130 coupled to the 110; A pump cover 150 accommodating the pump module 130 and having a cover rib 153 protruding from the inside toward the pump module 130 to be coupled to the motor housing 110; One side is coupled to the cover rib 153 and the other side is preferably made of a cover rubber member 170 having a skirt 171 supported by the side plate 137.

The material of the motor housing 110 and the pump cover 150 includes an aluminum material and receives and supports the motor 111 and the pump module 130, respectively.

The motor housing 110 has a connector 113 through which a cable for transmitting electromagnetic communication for applying power or the like or a detection result of a sensor, etc. can be coupled or passed, and air is supplied to the pump module 130. The suction port 115 is sucked and the suction air is pressurized by the pump module 130, and the discharge port 117 is discharged or discharged to the outside, and the motor capable of transmitting the rotational force of the motor 111 to the rotor 131 The rotor shaft 111a combined with the shaft (not shown) is coupled. In addition, a suction hole 115a is formed on the plate surface of the motor housing 110 to penetrate the suction port 115 and guide air toward the suction port 115 side of the pump module 130. Depending on the shape of the cam ring 135, the suction hole 115a is preferably provided as a pair in a single suction type or in a symmetrical position in a double suction type, and two examples are provided in this embodiment.

The pump module 130 injects air by using the rotational force provided by the motor 111, pressurizes it, and discharges it. Pump module 130, a plurality of slots formed by rotating by a rotor shaft (111a) coupled by a coupling means (not shown) including a coupling coupled to a motor shaft (not shown) of the motor 111 ( The rotor 131 having a vane 133 that is movably connected to 131a) and an eccentric eccentric with the rotor 131 form a guide surface on which the vane 133 slides, and air between the vanes 133 Side provided with a cam ring (135) provided to form a chamber (not shown) which is a space to be sucked and compressed, a discharge hole (137a) through which air is discharged from the pump module (130), and a plate hole (137b) formed through the center It consists of a plate (137). The pump module 130 is coupled to and supported by the motor housing 110 by a pump coupling means 139 including bolts.

The pump cover 150, as shown in Figure 2b and 3, forms an outer appearance and the cover body 151 coupled by a fastening means 191 including a bolt to the motor housing 110, and the pump module It includes a strip-shaped cover rib 153 having a thickness set to a hollow cylindrical shape extending from the inside of the cover body 151 toward the 130.

2A and 3, the cover rib 153 is provided with a plurality of rib slots 155 which are radially divided along the circumference (see 8 places in FIG. 3) and penetrated to a set width. The cover rubber member 170 is formed to form a rubber member engaging jaw 157 that is recessed in the outer circumferential plate surface, and the cover rubber member 170 is coupled to the rubber member engaging jaw 157 to open the rib slot 155. It is desirable to form a cover rib rubber gap 159 that partially closes to guide the flow of air (see 'Agap' in FIG. 3).

Cover rubber member 170, as shown in Figures 2a and 3, in the form of a plate across the hollow strip-shaped skirt 171, has an intermediate hole 173 penetrated through the central region, elastically deformable intermediate The plate 177 has a lower rib 175 extending in a length smaller than the skirt 171 from the middle plate 177 toward the side plate 137 in the shape of a hollow band having a diameter larger than the middle hole 173 . When the cover rubber member 170 is coupled to the side plate 137 due to the difference in length between the skirt 171 and the lower rib 175, the gap between the side plate 137 and the lower rib 175 (FIG. 3) 'K') may be generated and the pressurized air from the pump module 130 may be guided to the outside through the gap K. An example of such a gap K may be 2 mm.

Here, the cross-sectional area of the intermediate hole 173 (see 'Ahole' in FIG. 3) is preferably larger than the cross-sectional area of the cover rib rubber gap 159 (see 'Agap' in FIG. 3). Due to this size difference, the air passing through the intermediate hole 173, which is the center of the intermediate plate 177 (see 'CL' in FIG. 2A), covers a plurality of covers located at the same radius at the center (see 'PCD159' in FIG. 3). The rib rubber gap 159 may be uniformly distributed and guided.

As such, a sudden change in the cross-sectional area occurs in the flow of the discharged or discharged air that is pressurized by the pump module 130, so that noise can be reduced more effectively as described below (noise generated in the electric vacuum pump of the prior art of FIG. 5A). See the graph and the noise graph generated by the electropneumatic vacuum pump according to the present invention in FIG. 5B).

In addition, the intermediate plate 177 is provided to be elastically deformable in the process of the air flowing backward from the discharge port 117 to the pump module 130 by stopping the vane 133 of the pump module 130 by stopping the motor 111. The lower rib 175 is in close contact with the plate surface of the side plate 137, it is possible to prevent the reverse flow of air to flow into the vane 133 side of the pump module 130. That is, the electric vacuum pump 100 is in operation, the driver brakes discontinuously for various reasons while the vehicle is driving, and in this case, when the electric vacuum pump 100 operates and the brake stops working, the operation stops. The operation and stop of the vacuum pump 100 occurs very frequently, and among these processes, air flows from the discharge port 117 to the pump module 130 as the vane 133 stops momentarily during stoppage. The moisture contained in the air or the moisture itself is introduced into the pump module 130 according to the reverse flow of the.

In addition, since the vane 133 is made of a material that is weak against moisture, it is possible to prevent such a phenomenon in advance according to the present invention, as it may rotate and rotate at high speed when moisture is introduced, and may be desorbed due to damage such as damage or heat generation.

And, as shown in Figure 4c, even if there is moisture flowing into the pump module 130 side, such moisture can be collected in the plate hole 137b, which is the center of the side plate 137, and the plate hole 137b has moisture. After being accommodated, it is preferable to be discharged to the outside together with air by heat generated by rotation of the rotor shaft 111a and rotation of the vane 133 and the rotor 131.

The operation process of the electric vacuum pump 100 having such a configuration will be described in detail with reference to FIGS. 4A to 4C.

First, as shown in Figure 4a, when the motor 111 is rotated by the applied power, the motor shaft-the rotor 131 through the rotor shaft (111a) rotates and the vane by the rotation of the rotor (131) ( 133) rotates while contacting the inner wall surface of the cam ring (135).

The space formed by the cam ring 135, the motor housing 110, and the side plate 137 by the rotation of the vane 133 is a suction port (in accordance with the volume change of the pressure chamber (not shown) between each vane 133) The air is sucked in from 115) and introduced into the pressure chamber through the suction hole 115a, compressed, and pressurized by the discharge hole of the side plate 137 (see '①' of FIG. 4A and FIG. 4B) and a rather wide skirt (171 ) And the lower rib 175 (see '②' and Figure 4b in Figure 4a) is discharged or discharged. Next, ② the air discharged into the space passes through the intermediate hole 173 through the gap between the side plate 137 and the lower rib 175 (see 'K' in FIGS. 3 and 4A) ('③ in FIG. 4A) 'And Figure 4b).

The air that has passed through the intermediate hole 173 is accommodated in a space between the inner plate surface of the pump cover 150, which is a rather large space, and the cover rib 153, and is radially open (in the case of FIG. 4A, the 360-degree direction is 8 Divided into equal parts) passes through the cover rib rubber gap 159 (see '④' and Fig. 4b in Fig. 4a).

The air that has passed through the cover rib rubber gap 159 is guided to a rather large space (see '⑤' in FIG. 4A) and is discharged to the outside through a narrower discharge port (117, see '⑥' in FIG. 4A).

That is, through this process, the pressurized air is guided to sequentially pass through a large area-a narrow area in multiple stages, thereby reducing noise generated in the process of discharging air or noise generated in the pump module 130.

On the other hand, when the motor 111 is stopped in the electric vacuum pump 100 rotating as described above, as shown in Figure 4c, the vane 133 is stopped and the inside of the pump module 130 by the stop Due to the pressure difference of the outside air, the air in the discharge port 117 may be introduced into the pump module 130 inside. The intermediate plate 177 is elastically deformed to the lower side plate 137 side by the pressure of the external air (refer to 'Fback' in FIG. 4C), so that the lower rib 175 contacts the upper plate surface of the side plate 137. While pressurizing, it is possible to prevent external air or moisture from flowing into the discharge hole 137a of the pump module 130 through the lower rib 175.

Here, as shown in FIG. 3, the lower rib 175 is radially inside from the center of the rotor shaft 111a (refer to 'CL' in FIG. 3) to the discharge hole 137a ('r1' and 'in FIG. 3). r2 '), it is possible to prevent the air or moisture inside the lower rib 175 from flowing into the discharge hole 137a. On the other hand, if the lower rib 175 is in contact with the plate surface of the side plate 137, water and the like formed in the case are gathered around the plate hole 137b and the rotor shaft 111a rotates, the rotor 131, the vane The heat generated by the rotation of (133) may be gradually discharged to the outside along with evaporation or air.

As a result of testing the electric vacuum pump 100 and comparing it with the prior art, the electric vacuum pump according to the present invention has a noise of 73.0 to 70.2 dB in the electric vacuum pump according to the prior art as shown in FIG. The present inventors were able to confirm that the noise at is reduced to 70.4 to 68.8 dB.

Accordingly, according to the present invention, it is possible to provide an electric vacuum pump capable of reducing noise by changing the volume or area of the area in which the air is received in multiple stages in the process of discharging air.

In addition, it is possible to provide an electric vacuum pump that can prevent the moisture contained in the air flowing back to the pump module from outside when entering the vane of the pump module.

Here, although one embodiment of the present invention has been described and described, it can be seen that a person having ordinary knowledge in the technical field to which the present invention pertains can modify the present embodiment without departing from the principles or spirit of the present invention. will be. The scope of the invention will be defined by the appended claims and their equivalents.

100: electric vacuum pump 110: motor housing
111: motor 111a: rotor shaft
113: connector 115: inlet
115a: suction hole 117: discharge port
130: pump module 131: rotor
131a: Slot 133: Bain
135: cam ring 137: side plate
137a: discharge hole 137b: plate hole
139: pump coupling means
150: pump cover 151: cover body
153: cover rib 155: rib slot
157: rubber member engaging jaw 159: cover rib rubber gap
170: cover rubber member 171: skirt
173: Middle hole 175: Lower rib
177: intermediate plate 191: fastening means

Claims (7)

In an electric vacuum pump,
A motor housing supporting a motor providing a driving force by a power applied from the outside;
A rotor rotatably coupled to a rotor shaft coupled to the motor, a vane rotatably coupled to the rotor, a cam ring in contact with an end of the vane, and coupled to the cam ring to accommodate the rotor and the vane A pump module provided with a side plate and coupled to the motor housing so as to discharge the pressurized air;
A pump cover accommodating the pump module and having a cover rib protruding from the inside toward the pump module to be coupled to the motor housing;
One side is coupled to the cover rib and the other side is a cover rubber member having a skirt supported on the side plate; Electric vacuum pump comprising a. According to claim 1,
The cover rib has a plurality of rib slots formed in a radially divided width along a circumference and formed through a set width,
The cover rib is formed with a rubber member engaging jaw recessed in the outer circumferential plate surface so that the cover rubber member can be coupled.
The cover rubber member is coupled to the rubber member engaging jaw to partially close the rib slot to form a cover rib rubber gap that guides the flow of air. According to claim 2,
The cover rubber member is provided with an intermediate plate having an intermediate hole penetrating through a central region in a plate shape crossing the skirt in the shape of a hollow band,
The cross-sectional area of the intermediate hole is larger than the cross-sectional area of the cover rib rubber gap, the electric vacuum pump. According to claim 3,
The cover rubber member further includes a lower rib extending in a length smaller than the skirt from the intermediate plate toward the side plate in the shape of a hollow band having a diameter larger than the middle hole,
The intermediate plate is provided to be elastically deformable in a process in which air flows from the discharge port to the pump module when the motor is stopped, and the lower rib is in close contact with the side plate so that air flowing back does not flow into the vane side. Electric vacuum pump. According to claim 1,
The cover rubber member is coupled to the pump cover, and includes an intermediate plate having an intermediate hole penetrated into a central region of a plate-shaped crossing the skirt in a hollow shape, and a hollow cylindrical shape having a larger diameter than the intermediate hole. In the intermediate plate toward the side plate is provided with a lower rib extending to a length less than the skirt,
The intermediate plate is elastically deformed in the process of backflow of air from the discharge port to the pump module by stopping the motor so that the lower rib is in close contact with the side plate so that the backflowed air does not flow into the vane side. Pump. The method of claim 5,
A discharge hole through which compressed air is discharged from the pump module is formed in the side plate.
The discharge hole is an electric vacuum pump, characterized in that located more radially outward from the rotor shaft than the lower rib. The method of claim 6,
An electric vacuum pump comprising a plate hole formed in the center of the side plate.

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