JP5253770B2 - Negative pressure source device for automobiles - Google Patents

Description

The present invention relates to an automotive negative pressure source device used in a brake booster.

For example, an electric vehicle does not have a negative pressure source for increasing the hydraulic brake force unlike a gasoline vehicle, and therefore a negative pressure source device is required to supply the negative pressure. This negative pressure source device has an electric vacuum pump for generating negative pressure and a vacuum tank (negative pressure tank) for accumulating the generated negative pressure, which are arranged in a space in the engine room. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 10-329701

  The negative pressure source device is required to be a more compact product due to space limitations in the engine room. However, in the conventional configuration, since it is necessary to provide the electric vacuum pump and the vacuum tank individually, it is difficult to reduce the size.

The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an automotive negative pressure source device that can achieve further miniaturization while ensuring the functions of an electric vacuum pump and a vacuum tank. And

In the present invention, in an automotive negative pressure source device including an electric vacuum pump that is driven by an electric motor and generates negative pressure, a motor cover is provided between the motor case of the electric motor and the vacuum pump. forming a closed space in the cover and the motor case, and accumulating a negative pressure generated in the electric vacuum pump to the sealed space Rutotomoni to function the enclosed space as a vacuum tank, wherein the motor cover, said motor cover Is provided with an intake passage through which the negative pressure is moved from the sealed space to the electric vacuum pump, and a check valve is provided in the intake passage.
According to this structure, the function of the conventional vacuum tank can be given to the motor case of the electric motor. Moreover, it is possible to prevent negative pressure from flowing back from the electric vacuum pump to the sealed space.

The intake passage includes a narrow passage having a front opening on the electric motor side, a wide passage having a front opening on the vacuum pump side, and an inclined passage having an inclined surface connecting these passages, and the check valve includes the inclined passage. You may provide the ball | bowl part which contact | abuts a channel | path and obstruct | occludes the said intake channel | path, and the spring which urges | biases this ball | bowl part toward the inclined surface of the said inclined channel | path .

The motor case and the motor cover are formed to be larger in the radial direction around the shaft of the electric motor than the vacuum pump, and the motor case and the motor cover are assembled via a seal ring to thereby form the sealed space. It may be formed.
According to this configuration, the assembly of the electric motor and the vacuum pump can be facilitated.

  According to the negative pressure source device of the present invention, the motor case of the electric motor is configured in a sealed structure, and the negative pressure generated by the electric vacuum pump is accumulated in the sealed space, thereby functioning the conventional vacuum tank. Can be provided in the motor case of the electric motor, and the installation space for the vacuum tank can be reduced as compared with the case where the vacuum tank is provided separately. In addition, the function of the vacuum tank can be ensured.

  Hereinafter, a negative pressure source device 1 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a side view of a negative pressure source device 1 according to an embodiment of the present invention. 2 is a cross-sectional view showing a state where the negative pressure source device 1 of FIG. 1 is cut along line 2-2. In FIG. 1, the vane pump 20 located on the left side is shown by a cross section cut along line 1-1 in FIG. 2, and the lower side of the right motor unit is shown by a cross section cut at the center. In the following description, the horizontal direction and the vertical direction are based on FIG.

As shown in FIG. 1, the negative pressure source device 1 has a central axis X extending in the left-right direction, and an electric motor 10 located on the right side, a vane pump 20 (electric 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. 1, the motor case 11 has a substantially cylindrical shape with an opening on the left side, and a flange portion 11b is formed on the opening edge portion so as to protrude outward from the outer peripheral surface 11a. The flange portion 11 b is fixed with the motor cover 30 and the bolt 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. A wiring 17 for controlling the electric motor 10 and supplying electric power extends from the lower side of the negative pressure source device 1. Further, a suction port 11c for sucking air protrudes from the lower right side of the motor case 11 in a manner extending to the right side. Further, the motor case 11 is formed to have a plate thickness that can withstand a negative pressure described later.

  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. Further, 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. Thereby, the rotating shaft 12 is supported by the bearings 16a and 16b and is configured to be rotatable.

  With this configuration, a sealed space S is formed by the motor cover 30 and the motor case 11. The sealed space S is located between the suction port 11c and the vane pump 20, and can store the negative pressure generated by the vane pump 20.

Further, the motor cover 30 is formed with an intake passage 32 penetrating left and right in a portion above the rotating shaft 12. The intake passage 32 includes a passage 32a having a narrow opening on the electric motor 10 side, a passage 32b having a wide opening on the vane pump 20 side, and an inclined passage 32c having an inclined surface connecting these passages 32a and 32b. .
A check valve 33 is provided inside the intake passage 32. As shown in FIG. 1, the check valve 33 includes a ball portion 33a that abuts the inclined passage 32c and closes the intake passage 32, and a spring that urges the ball portion 33a toward the inclined surface of the inclined passage 32c. 33b.

The vane pump 20 is a rotary vane-type vacuum pump. As shown in FIG. 2, a cylinder body 21 that forms the outer shape of the vane pump 20, a rotor 22 positioned inside the cylinder body 21, Plates 23a and 23b are provided at the left and right ends. 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. 1, the cylinder body 21 has a cylindrical shape having openings on the left and right sides, 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. 1, the cylinder body 21 is formed with an intake passage 32 positioned on the upper side and a discharge port 27 positioned on the lower side.

  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. Further, as shown in FIG. 1, the plates 23 a and 23 b are assembled so as to block the openings at the left and right ends of the cylinder body 21 and leave no gap between the both ends of the rotor 22.

  As shown in FIG. 2, 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. 2 will be described in detail. The vane 25 located in the upper portion projects 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 positioned in the lower portion is pushed inward of the rotor 22 with its tip end abutting against the inner peripheral wall surface 21 a and is retracted into the rotor 22. With this structure, for example, when the rotor 22 rotates clockwise, the outer wall surface of the rotor 22, the inner peripheral wall surface 21 a of the cylinder body 21, and the pressure chamber P partitioned by the adjacent vanes 25 move, so that the air is moved. It is sent out from the intake passage 32 (formed at a location where the volume of the pressure chamber P is large) to the discharge port 27 (formed at a location where the volume of the pressure chamber P is small).

Next, the operation of the negative pressure source device 1 will be described.
When the vane pump 20 sucks air from the suction port 11c, the negative pressure generated by the vane pump 20 is accumulated in the sealed space S surrounded by the motor case 11 and the motor cover 30. That is, the inside of the motor case 11 functions as a conventional vacuum tank. Since the sealed space S in the motor case 11 is sealed by the seal ring 31, a negative pressure in the sealed space S is ensured.

  When the air in the motor case 11 reaches a pressure difference higher than the biasing force of the spring 33b of the check valve 33, the air moves the ball portion 33a toward the vane pump 20, passes through the intake passage 32, and the pressure of the vane pump 20 It will flow into the chamber P (cylinder chamber). On the other hand, the check valve 33 prevents the air flowing into the pressure chamber P from flowing back to the motor case 11 when the electric motor 10 is stopped.

  The air that has moved to the vane pump 20 is compressed as the volume of the pressure chamber P changes, and is discharged from the discharge port 27 to the outside (atmosphere) of the negative pressure source device 1.

FIG. 3 is a system block diagram of an automobile brake device using the negative pressure source device according to the embodiment of the present invention.
In a brake booster that reduces the brake operation force by using the assistance of negative pressure in an automobile, a booster 52 is interposed between the brake pedal 50 and the master cylinder 51, and the negative pressure is passed through the booster 52 and the pipe 53. A source device 1 is connected. The negative pressure source device 1 adjusts the pressure applied to the master cylinder 51. In this system, the control circuit 54 receives a detection signal from the pressure sensor 55 that detects the pressure in the pipe 53, and controls the electric motor 10 of the negative pressure source device 1 based on the detection signal. .

  According to the negative pressure source device 1 according to the embodiment of the present invention, the motor cover 30 is interposed between the motor case 11 of the electric motor 10 and the electric vacuum pump 20, and the motor case 11 and the motor cover 30 are sealed. Since the sealed space S is formed by assembling via the ring 31 and the negative pressure generated by the electric vacuum pump 20 is accumulated in the sealed space S, the function of the conventional vacuum tank is achieved by the motor case 11 of the electric motor 10. In addition, the sealed space S formed by the motor cover 30 can be provided, and a vacuum tank can be dispensed with separately. Thereby, the installation space for a vacuum tank can be made small compared with the case where a vacuum tank is provided separately. In addition, the function of the vacuum tank can be ensured.

  In addition, an intake passage 32 for moving negative pressure from the sealed space S to the electric vacuum pump 20 is formed in the motor cover 30, and a check valve 33 is provided in the intake passage 32, so that the closed space S from the electric vacuum pump 20 is provided. It is possible to prevent the air from flowing backward. Thereby, the vane pump 20 can generate | occur | produce the negative pressure stably. In addition, the pressure applied to the master cylinder 51 can be easily adjusted.

Although the best embodiment for carrying out the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. It is.
For example, in the present embodiment, the sealed space S is formed by assembling the motor case 11 and the motor cover 30, but the sealed space S is formed only by the motor case 11 without using the motor cover 30. It may be. According to this configuration, the function of the conventional vacuum tank can be provided to the motor case 11 of the electric motor 10, and the installation space for the vacuum tank can be reduced as compared with the case where the vacuum tank is provided separately. be able to. In addition, the function of the vacuum tank can be ensured.

  FIG. 4 is a side view of a negative pressure source device 101 according to another embodiment of the present invention. The negative pressure source device 101 is obtained by enlarging the electric motor 10 and the motor cover 30 of the negative pressure source device 1 shown in FIG. 1 in the radial direction around the central axis X, and the other configurations are the same. is there. That is, the motor case 111 of the electric motor 110 and the motor cover 130 that closes the left-side opening of the motor case 111 are formed large in the radial direction to ensure a large sealed space S. Thereby, more negative pressure air can be accumulate | stored in the motor case 111 (inside the sealed space S) which functions as a vacuum tank.

  Moreover, the sealed space S can be further ensured by forming the negative pressure source devices 1 and 101 shown in FIGS. Thereby, more negative pressure air can be accumulated in the motor cases 11 and 111 (in the sealed space S) functioning as a vacuum tank.

It is a side view of the negative pressure source device concerning an embodiment of the invention. It is sectional drawing which shows the state which cut | disconnected the negative pressure source device shown in FIG. It is a system block diagram using the negative pressure source device concerning an embodiment of the invention. It is a side view of the negative pressure source device concerning other embodiments of the present invention.

Explanation of symbols

1,101 Negative pressure source device 10,110 Electric motor 11,111 Motor case (vacuum tank)
11a Outer peripheral surface 11b Flange portion 11c Suction port 12 Rotating shaft 13 Rotor 14 Stator 15 Bolt 16a, 16b Bearing 17 Wiring 20 Vane pump (electric vacuum pump)
21 Cylinder body 21a Inner peripheral wall surface 22 Rotor 22b Sliding groove 23a, 23b Plate 24 Outer plate 25 Vane 26 Connection key 27 Discharge port 28 Silencer 29 Pump cover 30, 130 Motor cover 30a Groove portion 31 Seal ring 32 Intake passage 32a Narrow passage 32b Wide passage 32c Inclination passage 33 Check valve 33a Ball portion 33b Spring 34 Bolt 50 Brake pedal 51 Master cylinder 52 Booster 53 Piping 54 Control circuit 55 Pressure sensor S Sealed space X, Y Center shaft

Claims (3)

In an automotive negative pressure source device equipped with an electric vacuum pump that is driven by an electric motor and generates negative pressure,
A motor cover is provided between the motor case of the electric motor and the vacuum pump, a sealed space is formed by the motor cover and the motor case, and the negative pressure generated by the electric vacuum pump is accumulated in the sealed space. Te to function the enclosed space as a vacuum tank Rutotomoni, the motor cover through the motor cover to the axial direction of the electric motor, an intake passage for moving the negative pressure to the electric vacuum pump from said enclosed space A negative pressure source device for an automobile , wherein a check valve is provided in the intake passage. The intake passage includes a narrow passage having a front opening on the electric motor side, a wide passage having a front opening on the vacuum pump side, and an inclined passage having an inclined surface connecting these passages, and the check valve includes the inclined passage. 2. The negative for an automobile according to claim 1, further comprising: a ball portion that contacts the passage and closes the intake passage; and a spring that biases the ball portion toward the inclined surface of the inclined passage. Pressure source device. The motor case and the motor cover are formed to be larger in the radial direction around the shaft of the electric motor than the vacuum pump, and the motor case and the motor cover are assembled via a seal ring to thereby form the sealed space. The negative pressure source device for an automobile according to claim 1 , wherein the negative pressure source device is formed.

Images