JP2010151065A - Negative pressure source supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a negative pressure source supply device making operation noise of a vacuum pump not easily leaking to the outside. <P>SOLUTION: The negative pressure source supply device includes an electric vacuum pump 20 driven by an electric motor 10 to generate negative pressure. In the negative pressure source supply device, a cover covering a circumference of the electric vacuum pump 20 at an interval is provided, and a negative pressure attenuation space U is formed in the interval between the cover 40 and the electric vacuum pump 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a negative pressure source supply device for obtaining a vacuum in a container, and more particularly to a negative pressure source supply device used for a brake booster.

  For example, an electric vehicle does not have a negative pressure source for increasing the hydraulic braking force unlike a gasoline vehicle, and therefore a negative pressure source supply device is required to supply the negative pressure. This negative pressure source supply device includes an electric vacuum pump for generating negative pressure, and a vacuum tank (negative pressure tank) for accumulating the generated negative pressure, and these are provided in a space in the engine room. (For example, refer patent document 1).

The negative pressure source supply device generates an operation sound when compressing the gas sent from the vacuum tank. Therefore, conventionally, an electric vacuum pump is covered with a case (sound-absorber cap) to provide a damping space of a sound absorber, and exhaust air is sent to pass through the attenuation chamber. Some exhaust air reduces noise (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 10-329701 US Pat. No. 6,491,505

However, electric vehicles have higher quiet performance than gasoline vehicles. For this reason, it is desired that the operation sound of the electric vacuum pump be reduced from the outside.
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a negative pressure source supply device that makes it difficult to leak the operation sound of the vacuum pump to the outside.

In the present invention, in a negative pressure source supply device including a vacuum pump that is driven by an electric motor to generate a negative pressure, a cover that covers the periphery of the vacuum pump with a gap is provided, and the cover and the vacuum pump A negative pressure attenuation space is formed between them.
According to this configuration, it is possible to cover the periphery of the vacuum pump with negative pressure air in which sound is difficult to propagate.

The vacuum pump may be formed with an intake passage for taking in negative pressure air in the attenuation space.
According to this configuration, for example, negative pressure air sent from the vacuum tank into the attenuation space can be further taken into the vacuum pump.

Furthermore, you may make it provide the discharge passage through which the air compressed with the said vacuum pump is discharged | emitted via the inside of the said electric motor.
According to this configuration, it is not necessary to provide a discharge port in the vacuum pump, and the entire electric motor can be covered with the attenuation space.

Further, the cover may constitute a part of a vacuum tank communicating with the vacuum pump, and the vacuum pump and the electric motor may be accommodated in the vacuum tank.
According to this configuration, since the operation sound of the vacuum pump and the electric motor can be attenuated by the negative pressure air, the operation sound of the vacuum pump and the electric motor can be hardly leaked to the outside of the negative pressure source supply device. . Furthermore, since the vacuum pump and the electric motor are accommodated in the vacuum tank, the space in the engine room can be used effectively.

  According to the negative pressure source supply device of the present invention, in the negative pressure source supply device provided with a vacuum pump that is driven by an electric motor to generate a negative pressure, a cover that covers the periphery of the vacuum pump with a gap is provided. Since a negative pressure attenuation space is formed between the cover and the vacuum pump, the vacuum pump is covered with negative pressure air that is hard to propagate sound compared to the atmosphere or compressed air. Is attenuated by the negative pressure air. As a result, the operation sound of the vacuum pump can be made difficult to leak outside the negative pressure source supply device. In addition, by utilizing the negative pressure air in the vacuum tank, it is not necessary to provide a device for generating a negative pressure other than the negative pressure source supply device.

Hereinafter, a negative pressure source supply device 50 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a brake device using a negative pressure source supply device 50 according to an embodiment of the present invention.
The brake device 100 includes front brakes 1a and 1b attached to left and right front wheels, and rear brakes 2a and 2b attached to left and right rear wheels. These brakes are connected to the master cylinder 3 by a brake pipe 9, and each brake is operated by hydraulic pressure sent from the master cylinder 3 through the brake pipe 9.
The brake device 100 includes a brake booster 5 connected to the brake pedal 4, and the pedaling force of the brake pedal 4 is reduced by the air pressure in the vacuum tank 6 (vacuum tank), and the piston (not shown) of the master cylinder 3. Is supposed to move.

  The vacuum tank 6 is connected to a negative pressure source supply device 50 for discharging air. The negative pressure source supply device 50 discharges the air in the tank to the outside of the vehicle in order to make the vacuum tank 6 in a vacuum state. The brake booster 5, the vacuum tank 6, and the negative pressure source supply device 50 are connected by an air pipe 8.

FIG. 2 is a side view of the negative pressure source supply device 50 according to the embodiment of the present invention. 3 is a cross-sectional view showing a state where the negative pressure source supply device 50 of FIG. 2 is cut along line 3-3.
In the following description, the horizontal direction and the vertical direction are based on FIG.

  As shown in FIG. 2, the negative pressure source supply device 50 has a central axis X extending in the left-right direction, the electric motor 10 located on the right side, the vane pump 20 (vacuum pump) located on the left side, and the electric motor 10 and the vane pump 20 are provided.

  The electric motor 10 includes a motor case 11 that covers the outside, a rotating shaft 12 that is provided inside the motor case 11 and that can rotate around a central axis X, and a rotor 13 that is attached to the rotating shaft 12. And a stator 14 that is disposed at a distance from the outer periphery of the rotor 13 and is attached to the motor case 11.

As shown in FIG. 2, the motor case 11 has a substantially cylindrical shape with an opening on the left side, and a flange portion 11b is formed at the opening edge so as to protrude outward from the outer peripheral surface 11a. The flange portion 11 b is fixed to the motor cover 30 with bolts 15. A bearing 16 a that pivotally supports the right end of the rotating shaft 12 is provided inside the right side of the motor case 11.
Further, a discharge port 11 c protruding from the motor case 11 is provided at the lower right side of the motor case 11. The discharge port 11c is for releasing the compressed air 140 compressed by the vane pump 20 to the atmosphere.

The motor cover 30 is attached so as to close the left opening of the motor case 11. The motor cover 30 has a groove 30a continuously formed in the circumferential direction on the surface that contacts the flange 11b. The outside of the motor case 11 is prevented from entering outside of the groove 30a. A seal ring 31 is inserted for prevention.
With this configuration, a sealed space S is formed by the motor cover 30 and the motor case 11, and the compressed air 140 in the sealed space S is prevented from leaking from the contact surface between the motor cover 30 and the motor case 11 by the seal ring 31. It has become. The sealed space S is located between the discharge port 11c and the vane pump 20, and serves as a discharge passage that guides the air compressed by the vane pump 20 to the discharge port 11c.
Moreover, the motor case 11 has a sufficient plate thickness that can withstand the pressure of the compressed air 140 in the sealed space S.

  Further, the motor cover 30 is formed with a compressed air conduction path 27 communicating from the inside of the vane pump 20 to the sealed space S so as to extend in the left-right direction in FIG. The compressed air conduction path 27 is provided with a check valve (not shown) for allowing the compressed air 140 to flow into the sealed space S from the vane pump 20 side and preventing the compressed air 140 from flowing. .

The motor cover 30 is provided with a bearing 16b that pivotally supports the left side of the rotary shaft 12 at the center thereof. A wiring 17 for controlling the electric motor 10 and supplying electric power extends from the lower side of the motor cover 30.
As a result, when electric power is supplied to the electric motor 10 via the wiring 17, the rotary shaft 12 supported by the bearings 16a and 16b rotates and is driven.

On the other hand, the vane pump 20 is a rotary vane type vacuum pump. As shown in FIG. 3, the cylinder body 21 constituting the outer shape of the vane pump 20, the rotor 22 positioned inside the cylinder body 21, and the cylinder body 21 are provided with plates 23a and 23b located at the left and right ends of the plate. Further, an outer plate 24 fastened to the cylinder body 21 with three bolts 34 is attached to the left side of the plate 23a.
As shown in FIG. 2, the cylinder body 21 has a cylindrical shape with openings on the left and right, and an inner peripheral wall surface 21 a is formed along a central axis X that extends to the left and right. Further, as shown in FIG. 2, the outer plate 24 and the plate 23 a are formed with an intake passage 32 positioned on the upper side in the vertical direction of the vane pump 20.

  The rotor 22 has a cylindrical shape having a central axis Y at a position eccentric from the central axis X. A driving force is transmitted to the rotor 22 via the rotary shaft 12 and the connection key 26. As shown in FIG. 2, the plates 23 a and 23 b are assembled so as to block the openings at both the left and right ends of the cylinder body 21 and leave no gap between the both ends of the rotor 22.

  Further, as shown in FIG. 3, the rotor 22 is provided with a plurality of vanes 25 that project obliquely toward the inner peripheral wall surface 21 a of the cylinder body 21. The vane 25 protrudes outward of the rotor 22 along a sliding groove 22b provided in the rotor 22 by a centrifugal force accompanying the rotation, and the tip of the vane 25 comes into contact with the inner peripheral wall surface 21a. The state of the vane 25 in FIG. 3 will be described in detail. The vane 25 located at the upper portion protrudes outward from the inside of the rotor 22, and the tip of the vane 25 contacts the inner peripheral wall surface 21 a of the cylinder body 21. It touches. On the other hand, the vane 25 located in the lower part is retracted into the rotor 22 by having its tip end abutted against the inner peripheral wall surface 21 a and pushed inward of the rotor 22. With this structure, for example, when the rotor 22 rotates clockwise, the pressure chamber P partitioned by the outer wall surface of the rotor 22, the inner peripheral wall surface 21 a of the cylinder body 21, and the adjacent vane 25 moves, so that the intake passage While the negative pressure air 120 taken in from 32 is compressed, it is formed from the intake passage 32 (formed at a location where the volume of the pressure chamber P is large) to the compressed air conduction path 27 (where the volume of the pressure chamber P is small). Will be sent out.

  On the other hand, as shown in FIG. 2, a pump cover 40 is attached to the motor cover 30 so as to cover the outer periphery of the vane pump 20. The pump cover 40 is attached to the outer peripheral surface of the motor cover 30 with a fastening member such as a bolt 41. As a result, a damping space U covered with the pump cover 40 is formed around the vane pump 20 (specifically, around the surface other than the surface attached to the motor cover 30).

The pump cover 40 is formed with an opening 42 for communicating with the vacuum tank 6 (see FIG. 1). As shown in FIG. 2, a connection pipe 43 extending from the vacuum tank 6 is airtightly connected to the opening 42 through a seal member or the like, and the negative pressure air 120 in the vacuum tank 6 It is possible to flow into the attenuation space U.
The opening 42 is provided with a check valve (not shown) for allowing the negative pressure air 120 to flow into the damping space U from the inside of the vacuum tank 6 and preventing it from flowing in the opposite direction. It has been.

The negative pressure air 120 in the attenuation space U flows from the intake passage 32 into the vane pump 20. Therefore, in order to ensure the airtightness of the damping space U, the bolt 41 is fastened with the seal member 44 interposed between the outer peripheral surface of the motor cover 30 and the mounting surface of the pump cover 40.
The pump cover 40 has a sufficient thickness that can withstand the pressure of the negative pressure air 120.

Next, the operation of the negative pressure source supply device 50 will be described.
When the negative pressure air 120 in the vacuum tank 6 flows into the vane pump 20 from the opening 42, the attenuation space U is filled with the negative pressure air 120. Since this negative pressure air 120 has less air vibration that transmits sound, it makes it difficult for the operating sound of the vane pump 20 to leak to the outside of the pump cover 40.

Further, the negative pressure air 120 in the attenuation space U moves into the vane pump 20 through the intake passage 32 and is compressed as the volume of the pressure chamber P changes. Thereby, the degree of vacuum in the attenuation space U is increased, and the degree of vacuum in the vacuum tank 6 is increased accordingly.
On the other hand, the air compressed by the vane pump 20 is guided to the sealed space S through the compressed air conduction path 27. Then, the compressed state in the sealed space S is released to the discharge port 11c, and is discharged from the discharge port 11c to the outside (atmosphere).

  According to the negative pressure source supply device 50 according to the embodiment of the present invention, in the negative pressure source supply device 50 including the vane pump 20 that is driven by the electric motor 10 and generates a negative pressure, a gap is formed around the vane pump 20. A pump cover 40 that is opened and covered is provided, and a negative pressure attenuation space U that communicates with the inside of the vacuum tank 6 is formed between the pump cover 40 and the vane pump 20, so that sound propagation is performed as compared with the atmosphere or compressed air. The surroundings of the vane pump 20 are covered with the negative pressure air 120 that is difficult to perform, and the operation sound of the vane pump 20 is attenuated by the negative pressure air 120. As a result, it is possible to make it difficult for the operation sound of the vane pump 20 to leak to the outside of the negative pressure source supply device 50. Further, by using the negative pressure air 120 in the vacuum tank 6, it is not necessary to provide a device for generating a negative pressure other than the negative pressure source supply device 50.

  Further, since the intake passage 32 for taking in the negative pressure air 120 in the attenuation space U is formed in the vane pump 20, the negative pressure air 120 sent from the vacuum tank 6 into the attenuation space U is further supplied to the vane pump 20. Can be taken into. Thereby, the negative pressure air 120 in the vacuum tank 6 can be taken into the vane pump 20 using the path from the vacuum tank 6 to the attenuation space U as it is.

  Furthermore, since the air compressed by the vane pump 20 is provided with a discharge passage through which the air is discharged via the sealed space S in the electric motor 10, it is not necessary to provide a discharge port for the compressed air 140 in the vane pump 20, and the vane pump The whole 20 can be covered with the attenuation space U.

  Further, since the compressed air 140 compressed by the vane pump 20 is guided into the sealed space S, an effect of cooling the coil can be expected when the compressed air 140 passes through the stator 14 of the electric motor 10. Thereby, the reliability of the whole negative pressure source supply apparatus 50 can be improved.

As mentioned above, although embodiment for implementing this invention was described, this invention is not limited to above-mentioned embodiment, Various deformation | transformation and change are possible based on the technical idea of this invention. .
For example, in the present embodiment, the vane pump 20 is used as the vacuum pump, but a vacuum pump other than the vane pump 20 (for example, a scroll pump) can be used. That is, by covering the periphery of the vacuum pump with the negative pressure air 120 of the vacuum tank 6, it is possible to make it difficult for the operating sound of the vacuum pump to leak outside the negative pressure source supply device.

In the present embodiment, the pump cover 40 is provided with the opening 42 so that the vacuum tank 6 and the damping space U communicate with each other through the connection pipe 43. However, the negative pressure source supply device 50 as a whole is connected to the vacuum tank 6. It may be accommodated and attached in the inside so that the entire inside of the vacuum tank 6 is used as an attenuation space. As a result, even if the vane pump 20 is not provided with the pump cover 40, the periphery of the vane pump 20 can be surrounded by the negative pressure air 120.
Thereby, the operation sound of the vane pump 20 can be made difficult to leak to the outside of the vacuum tank 6. Further, by using the negative pressure air 120 in the vacuum tank 6, it is not necessary to provide a device for generating a negative pressure other than the negative pressure source supply device 50.

Next, a structure in which the negative pressure source supply device 50 is housed and attached in the vacuum tank 6 will be described. In this configuration, the same components as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 4, the vacuum tank 6 includes a first tank body 60 and a second tank body 61 configured in two parts. Outer flanges 60a and 61a are formed around the openings of the first tank body 60 and the second tank body 61, and an O-ring 62 is interposed between the outer flanges 60a and 61a. It is fixed by the illustrated bolt and nut.
The first tank body 60 located on the vane pump 20 side is formed with a communication port 60b that communicates the inside and the outside of the first tank body 60, and the air pipe 8 described above is formed in the communication port 60b. It is connected. On the other hand, the second tank body 61 located on the electric motor 10 side includes a support member 63 for supporting the negative pressure source supply device 50 on the cylindrical body inner surface 61 b of the second tank body 61. The support member 63 is formed in a substantially L shape by extending from the body inner surface 61b of the second tank body 61 toward the center and then bent to the opening side of the second tank body 61. A plurality of support members 63 are provided at substantially equal intervals.

Further, the electric motor 10 includes a substantially L-shaped stay 65 provided around the motor case 11, and an anti-vibration rubber 64 is interposed between the stay 65 and the support member 63. The member 63 and the stay 65 are fixed by bolts (not shown). Thereby, the negative pressure source supply device 50 is supported by the second tank body 61.
Further, the first tank body 60 includes a clamping piece 60 c that extends to the inner periphery of the opening and holds the anti-vibration rubber 66 between the stay 65 of the electric motor 10. The sandwiching piece 60 c is formed at a position corresponding to the support member 63 when the first tank body 60 is assembled to the second tank body 61. In this configuration, in the negative pressure source supply device 50, the stay 65 formed in the motor case 11 of the electric motor 10 is fixed to the support member 63 of the second tank body 61 via the anti-vibration rubber 64. Since the anti-vibration rubber 66 is sandwiched between the surface of the stay 65 opposite to the support member 63 and the clamping piece 60c of the first tank body 60, the anti-vibration rubbers 64 and 66 provide a negative pressure source supply device. The negative pressure source supply device 50 can be mounted in the vacuum tank 6 with the vibration of 50 suppressed.

The second tank body 61 is formed with a lead-out port 67 for leading the wiring 17 of the electric motor 10 to the outside of the vacuum tank 6, and a packing 68 is disposed between the lead-out port 67 and the wiring 17. Thus, the airtightness of the vacuum tank 6 is maintained. Further, the second tank body 61 has an exhaust port 69, and the exhaust port 69 is provided with a check valve 70 that prevents inflow of air from the outside to the inside of the vacuum tank 6. The check valve 70 is connected to the discharge port 11 c of the electric motor 10 through a connection tube 71.
Therefore, when the vane pump 20 operates, the air in the vacuum tank 6 is sucked into the vane pump 20 through the intake passage 32 of the vane pump 20. The air compressed by the vane pump 20 is guided to the sealed space S through the compressed air conduction path 27, and is sent to the discharge port 11c while being released from the compressed state in the sealed space S. It is discharged to the outside (atmosphere) through the check valve 70. Thereby, the degree of vacuum in the vacuum tank 6 is increased, and the entire inside of the vacuum tank 6 can be used as the attenuation space U. According to this, since the operation sound of the vane pump 20 and the electric motor 10 can be attenuated by the negative pressure air, the operation sound of the vane pump 20 and the electric motor 10 can be hardly leaked to the outside of the vacuum tank 6. Furthermore, since the vane pump 20 and the electric motor 10 are accommodated in the vacuum tank 6, the space in an engine room can be used effectively.

It is a schematic diagram of a brake device provided with the negative pressure source supply device concerning an embodiment of the invention. It is a side view of the negative pressure source supply device concerning an embodiment of the invention. It is sectional drawing which shows the state which cut | disconnected the negative pressure source supply apparatus shown in FIG. 2 by 3-3 line. It is a schematic diagram which shows the state which accommodated the negative pressure source supply apparatus in the vacuum tank.

Explanation of symbols

1a Front brake 2a Rear brake 3 Master cylinder 4 Brake pedal 5 Brake booster 6 Vacuum tank (vacuum tank)
8 Air piping 9 Brake piping 10 Electric motor 11 Motor case 11a Outer peripheral surface 11b Flange 11c Discharge port 12 Rotating shaft 13 Rotor 14 Stator 15 Bolt 16a, 16b Bearing 17 Wiring 20 Vane pump (vacuum pump)
DESCRIPTION OF SYMBOLS 21 Cylinder main body 21a Inner peripheral wall surface 22 Rotor 22b Sliding groove 23a Plate 24 Outer plate 25 Vane 26 Connection key 27 Compressed air conduction path 30 Motor cover 30a Groove part 31 Seal ring 32 Intake passage 34 Bolt 40 Pump cover (cover)
41 bolt 42 opening 43 connecting pipe 44 seal member 50 negative pressure source supply device 60 first tank body 61 second tank body 63 support member 70 check valve 100 brake device 120 negative pressure air 140 compressed air P pressure chamber S sealed space ( Discharge passage)
U Attenuation space X, Y Center axis

Claims (4)

In a negative pressure source supply device including a vacuum pump that is driven by an electric motor to generate a negative pressure,
A negative pressure source supply device, wherein a cover for covering the periphery of the vacuum pump with a gap is provided, and a negative pressure attenuation space is formed in the gap between the cover and the vacuum pump.   The negative pressure source supply device according to claim 1, wherein the vacuum pump is formed with an intake passage for taking in negative pressure air in the attenuation space.   3. The negative pressure source supply device according to claim 2, further comprising a discharge passage through which air compressed by the vacuum pump is discharged via the electric motor.   The said cover comprises some vacuum tanks connected to the said vacuum pump, The said vacuum pump and the said electric motor were accommodated in this vacuum tank, The Claim 1 thru | or 3 characterized by the above-mentioned. Negative pressure source supply device.

Images