JP2013155623A - Negative pressure pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a negative pressure pump the cost of which is suppressed with simple structure, and which also can muffle exhaust sound from a pump part.SOLUTION: There is provided in a pump part 80, exhaust outlets 97, 98 on a side surface 112 opposite to the side which is in contact with a body part 30, a rib 64 projected to the pump part 80 side is integrally formed on a bottom part 56 of a cover body 50 and a chamber 66 with which the surrounding of the exhaust outlets 97, 98 is covered is formed by the rib 64. The chamber is provided near the exhaust outlets and, thereby, muffling effect of the exhaust sound can be obtained by the chamber. In addition, only the rib is integrally formed on the bottom part of the cover body and, therefore, the chamber which muffles the exhaust sound can be formed with simple structure. That is, the cost is suppressed by virtue of the simple structure and, moreover, the exhaust sound from the pump part can be muffled.

Description

  The present invention relates to a negative pressure pump, for example, a negative pressure pump that makes negative pressure in a negative pressure chamber of a negative pressure booster provided in a vehicle.

  As a kind of negative pressure pump, a negative pressure pump that generates a negative pressure by a rotor with a vane has been proposed (see, for example, Patent Document 1 (FIG. 2)).

The technique of this patent document 1 is demonstrated below based on drawing.
FIG. 23 is a cross-sectional view of a conventional negative pressure pump 200. When the motor 201 is operated and the rotor 202 and the vane are rotated, air is sucked into the pump case 204 from the air inlet 203 and is pressurized by the vane. Is discharged into the cover body 205 through the discharge port. Exhaust gas discharged into the cover body 205 is silenced by the silencer 206 and discharged through the exhaust path 207.

  Exhaust sound of exhaust discharged from the pump case 204 is silenced by a silencer 206 disposed in the cover body 205. However, the space for the silencer 206 in the cover body 205 is increased, and the cover body 205 is increased in size and cost.

  That is, there is a demand for a negative pressure pump that has a simple structure, reduces cost, and can mute exhaust sound from the pump unit.

US Pat. No. 6,491,505

  This invention makes it a subject to provide the negative pressure pump which can suppress the exhaust sound from a pump part while suppressing cost with a simple structure.

  The invention according to claim 1 includes a body portion as a base, a pump portion attached to one side surface of the body portion, and a cover attached to one side surface of the body portion having a storage chamber surrounding the pump portion. In the negative pressure pump consisting of a body and a motor attached to the other side surface of the body portion and driving the pump portion, the pump portion is provided with an exhaust outlet on the opposite side surface in contact with the body portion, A rib protruding toward the pump part is integrally formed at the bottom of the cover body, and a chamber chamber is formed by the rib to cover the periphery of the exhaust outlet.

  The invention according to claim 2 is characterized in that the exhaust outlet is disposed on a circumference centering on the motor shaft of the motor, and the rib is formed in a cylindrical shape covering the outer periphery of the exhaust outlet.

  The invention according to claim 3 is characterized in that the rib is formed with a notch communication passage through which exhaust gas passes from the inside to the outside of the rib.

In the invention according to claim 1, the pump portion is provided with an exhaust outlet on the opposite side surface in contact with the body portion, and a rib projecting toward the pump portion side is integrally formed on the bottom portion of the cover body. A chamber chamber is formed covering the periphery of the chamber.
By providing a chamber chamber in the vicinity of the exhaust outlet, it is possible to obtain a silencing effect of exhaust noise in this chamber chamber.
In addition, since the rib is only integrally formed at the bottom of the cover body, the chamber chamber for silencing the exhaust sound can be formed with a simple structure. That is, with a simple structure, the cost can be reduced and the exhaust sound from the pump unit can be silenced.

In the invention which concerns on Claim 2, an exhaust outlet is arrange | positioned on the periphery centering on the motor shaft of a motor, and a rib is formed in the cylindrical shape which covers the outer periphery of an exhaust outlet.
By making it cylindrical, cutting can be easily performed.
In addition, since the cylindrical shape is formed in accordance with the arrangement of the exhaust outlet, the exhaust from the pump unit can be reliably passed through the chamber chamber.

In the invention which concerns on Claim 3, the notch communicating path which lets exhaust_gas | exhaustion pass from the inner side of this rib to the outer side is formed in the rib.
Since air is exhausted through the notch communication passage formed in the rib, a further silencing effect can be obtained.

It is a figure which shows the example of arrangement | positioning of the negative pressure pump which concerns on this invention. It is a perspective view of a negative pressure pump. It is a fragmentary sectional view of a negative pressure pump. It is a disassembled perspective view of a negative pressure pump. It is a disassembled perspective view of a pump part. It is a perspective view of a cover body. It is a front view of a negative pressure pump. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. FIG. 9 is a sectional view taken along line 9-9 in FIG. 8. FIG. 10 is a sectional view taken along line 10-10 in FIG. 8. FIG. 11 is a cross-sectional view taken along line 11-11 in FIG. 9. 12 is a sectional view taken along line 12-12 of FIG. FIG. 13 is a sectional view taken along line 13-13 of FIG. FIG. 14 is an enlarged view of a portion 14 in FIG. 13. It is a figure explaining the flow of the intake air from a connection pipe to a pump part. It is a figure explaining the flow of the exhaust_gas | exhaustion in a chamber chamber. It is a figure explaining the flow of the exhaust_gas | exhaustion from a chamber chamber to an exhaust pipe. It is a figure explaining discharge of water generated by dew condensation. It is a figure explaining the flow of the air to a breathing hole. It is a figure explaining the other aspect of FIG. It is a figure explaining the other aspect of FIG. It is a figure explaining the other aspect of FIG. It is a principle diagram of a conventional negative pressure pump.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

First, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the negative pressure pump 10 of the present invention is a kind of vacuum pump that makes negative pressure in a negative pressure chamber 12 of a negative pressure booster 11 provided in a vehicle.
When the negative pressure pump 10 is operated, the negative pressure pipe 13, the negative pressure chamber 12, and the variable pressure chamber 14 are at negative pressure. When the brake pedal 16 is depressed in this state, the negative pressure chamber 12 and the variable pressure chamber 14 are cut off, air is introduced into the variable pressure chamber 14, and the diaphragm 17 is returned to the return spring by the differential pressure between the negative pressure chamber 12 and the variable pressure chamber 14. 18 is deformed to the compression side and push rod 19 is pushed out. As a result, a large braking force can be obtained with a small pedal effort.

The internal structure of the negative pressure pump 10 will be described with reference to FIG. In FIG. 2, the external appearance of the negative pressure pump 10 will be described.
As shown in FIG. 2, a body portion 30 as a base, a cover body 50 is attached to the upper surface of the body portion 30, and a motor 70 is attached to the lower surface of the body portion 30. A connecting pipe 21 for intake is attached to the narrow surface 31 of the body portion 30 with screws 22, and a plurality of (three in this example) arm portions 32 are extended from the body portion 30, and a bush 33 is attached to the arm portion 32. Is fitted. The bush 33 serves as a rubber mount when attached to the vehicle.

Next, the inside of the negative pressure pump 10 will be described.
As shown in FIG. 3, a pump unit 80 that generates a negative pressure is attached to the upper surface of the body unit 30. The pump unit 80 is surrounded by a storage chamber 51 provided in the cover body 50. An inner wall 63 is provided inside the cover body 50. A space between the inner wall 63 and the outer wall 52 of the cover body is formed as a compartment 53 (hereinafter referred to as a muffler chamber 53) partitioned from the storage chamber 51.

Next, the structure of the negative pressure pump 10 will be described in detail.
As shown in FIG. 4, the negative pressure pump 10 includes a body portion 30 as a base, and a plurality of (four in this example) provided on the upper surface 34 (one side surface 34 in the present invention) of the body portion 30. The pump portion 80 attached by screwing a long bolt 81 into the female screw hole 35, the connection pipe 21 connected to the suction port (detailed later), the pump portion 80 and the upper surface 34 of the body portion 30 (in the present invention) A cover body 50 attached by screwing screws 54 into a plurality (four in this example) of female screw holes 36 provided on one side surface 34) and a lower surface 37 (the other side surface 37) of the body portion 30 A plurality of (in this example, two) screws 71 are attached, and the motor shaft 72 includes a motor 70 that is an involute spline shaft.

An intermediate connector (reference numeral 73 in FIG. 8) for supplying power to the motor 70 is provided on the side of the motor 70.
Since the body part 30 is a base for mounting the motor 70 and connecting to the vehicle, it is desirable that the body part 30 is made of a metal having a large thickness and rigidity, such as a casting. A shaft hole 38 into which the motor shaft 72 is inserted is provided at the center of the body portion 30.

  The sound deadening chamber 53 is formed by combining the body part 30 and the cover body 50. A side surface of the body portion 30 to which the pump portion 80 is attached is referred to as an upper surface 34. A sealing material 41 is fitted along the outer periphery of the upper surface 34 and the outer periphery of the sound deadening chamber 53.

  Further, a semicircular intake groove 42 centering on the shaft hole 38 is provided on the upper surface 34 from the upper side to the lower side of the shaft hole 38, and a sealing material 43 such as an O-ring is provided so as to surround the intake groove 42. It is fitted on the upper surface 34.

  The cover body 50 has a shape in which an inclined portion 55 is provided in a part of a bottomed cylinder, a bottom portion 56 that faces the upper surface 34 of the body portion 30, and a cylindrical portion 57 that extends from the bottom portion 56 toward the upper surface 34. The flange portion 58 is formed at the end portion of the cylindrical portion 57 in a bowl shape.

  FIG. 5 is an exploded perspective view of the pump unit 80. The pump unit 80 includes a non-circular rotor chamber 82 and a case 84 provided with a plurality (four in this example) of bolt holes 83, and a plurality of vane grooves 85. Are provided radially, an involute spline hole 86 is provided at the center, a rotor 87 rotatably accommodated in a rotor chamber 82 having a non-circular cross section, and a vane 88 movably accommodated in a plurality of vane grooves 85, respectively. , An intake plate 94 having a plurality (four in this example) of bolt holes 91 and two upper and lower intake holes 92, 93, a plurality (four in this example) of bolt holes 96 and two upper and lower exhaust outlets 97. , 98 and a plurality of (four in this example) long bolts 81 that pass through the bolt holes 96, 83, 91.

Next, the inside of the cover body will be described.
As shown in FIG. 6, a cylindrical rib 64 is integrally formed on the bottom portion 56 of the cover body 50. The rib 64 is formed with a notch communication passage 65 that allows exhaust to pass from the inside to the outside of the rib 64. A chamber chamber 66 is formed by the space surrounded by the bottom portion 56 and the rib 64. In the embodiment, the two notch communication portions 65 are provided, but the present invention is not limited to this, and there may be three, four, or the like. Further, as long as the notch communication portion 65 is formed in the rib 64, it may be at another position.

  FIG. 7 is a front view of the negative pressure pump 10. The negative pressure pump 10 is provided on the upper surface 34 of the body portion 30 and generates a negative pressure (FIG. 4, reference numeral 80), and the upper surface 34 of the body portion 30. And a motor 70 that is provided on the lower surface 37 of the body portion 30 and drives the pump portion 80. Although details will be described later, the air sucked from the connection pipe 21 passes through the negative pressure pump 10 and is discharged from an exhaust pipe 111 extending downward from the body portion 30.

The internal structure of the negative pressure pump will be described in more detail based on FIGS.
FIG. 8 is a cross-sectional view of the negative pressure pump 10 assembled based on FIGS. 4 and 5.
As shown in FIG. 8, a rolling bearing 102 is provided in the shaft hole 38, and the motor shaft 72 is supported on the bearing 102. The tip of the motor shaft 72 is fitted into the involute spline hole 86 of the rotor 87, and the tip reaches the vicinity of the lid 101.

The flange portion 58 of the cover body 50 is in contact with the entire circumference of the sealing material 41, and the sealing material 41 ensures airtightness in the cover body 50.
On the other hand, the surface of the intake plate 94 is in contact with the entire periphery of the sealing material 43, and the opening of the intake groove 42 is blocked by the sealing material 43 and the intake plate 94, thereby forming the intake passage 103. As a result, an intake path including the connection pipe 21, the intake port 24, the intake passage 103, and the two intake holes (FIG. 5, reference numerals 92 and 93) is formed.

  On the other hand, the exhaust from the exhaust outlets 97 and 98 of the pump unit 80 is discharged into the storage chamber 51. A space between the storage chamber 51 and the pump unit 80 forms a part of the exhaust path 104. This exhaust path 104 also appears in FIG.

  The motor 70 is attached to the other side surface of the body portion 30. The motor 70 includes a brush holder 74, a motor case 75 provided so as to surround the brush holder 74, a stator 76 provided inside the motor case 75, a rotor 77 that rotates integrally with the motor shaft 72, and a motor. A bearing 78 is provided on the case 75 and rotatably supports the end of the motor shaft 72.

  The interior of the motor case 75 is communicated with the storage chamber 51 via the motor shaft 72. A space between the brush holder 74 and the motor case 75 is sealed with a sealing material 44. A space between the brush holder 74 and the body part 30 is sealed with a sealing material 45.

  Further, the pump portion 80 is provided with exhaust outlets 97 and 98 on the side surface 112 on the opposite side contacting the body portion 30. Ribs 64 are provided to surround the exhaust outlets 97 and 98. A chamber chamber 66 is formed in a space surrounded by the bottom portion 56, the rib 64, and the lid body 101. The periphery of the exhaust outlets 97 and 98 is covered with a chamber chamber 66.

  As shown in FIG. 9, the exhaust path 104 through which the exhaust from the exhaust outlets 97 and 98 passes through the space between the cover body 50 and the pump unit 80 in the storage chamber 51, and the storage chamber 51 and the muffler chamber 53. The communication path 105 to be connected, the muffler chamber 53, a recess 61 provided in the bottom 59 of the muffler chamber 53, and an exhaust pipe 62 connected to the recess 61. The communication path 105 is provided in the body part 30. The exhaust outlets 97 and 98 are arranged on a circumference around the motor shaft 72 of the motor (FIG. 8, reference numeral 70), and the rib 64 is formed so as to surround the exhaust outlets 97 and 98.

Next, one side surface 34 of the body part 30 will be described.
As shown in FIG. 10, a breathing hole 121 for supplying air from the vicinity of the motor shaft 72 to the motor (FIG. 8, reference numeral 70) is provided on one side surface 34 of the body portion 30 at a position away from the exhaust path 104. It is done. The breathing hole 121 is provided for supplying air to the motor 70 to prevent the inside of the motor 70 from being evacuated.

  In addition, a communication path 122 that guides air from the exhaust path 104 to the breathing hole 121 is provided on one side surface 34. The communication path 122 includes a bottom surface portion 123, a barrier 124 that is one step higher than the bottom surface portion 123, and a top surface portion 125 that is one step higher than the barrier 124 and closely contacts the intake plate (FIG. 8, reference numeral 94). Further, the communication path 122 has a meandering shape when viewed from the pump part (FIG. 8, reference numeral 80) side.

Next, the exhaust path 104 will be described based on a cross-sectional view taken along the axis of the communication path 105.
As shown in FIG. 11, the body 30 is provided with a storage chamber side recess 126 that is recessed downward on the upper surface 34 that forms the storage chamber 51. The communication path 105 is provided at the lowest position of the accommodation chamber side recess 126. The communication path 105 connects the storage chamber side recess 126 and the muffler chamber 53 and is inclined downward from the left to the right in the figure. The communication path 105 is formed by drilling the narrow surface 31 of the body portion 30, and the opening is closed with a steel ball 127.

Next, the silencer 53 will be described.
As shown in FIG. 12, a communication path 105 is provided in the muffler chamber 53. The muffler chamber 53 is a space surrounded by the cover body 50 and the bottom 59 of the muffler chamber provided in the body part 30. A recess 61 that is recessed downward is provided at the bottom 59 of the sound deadening chamber, and an exhaust pipe 62 of the recess 61 is connected. The bottom 59 of the silencer is inclined downward from the communicating part of the communication path 105 toward the right in the figure. That is, the recess 61 is provided at the lowest position of the bottom 59 of the muffler, and the exhaust pipe 62 extending downward from the recess 61 is provided.

Next, the air passage will be described.
As shown in FIG. 13, the body portion 30 is provided with an air passage 106 that directly communicates the storage chamber 51 and the motor case 75. The inlet 107 of the air passage 106 is provided at a position covered by the pump unit 80. The air passages 106 are provided in the body portion 30 so as to be parallel to the motor shaft (FIG. 8, reference numeral 72). One or more air passages 106 may be provided. Further, the inside of the motor case 75 is configured to communicate with the storage chamber 51 via a motor shaft (FIG. 8, reference numeral 72). In the embodiment, the motor case 75 is directly attached to the body portion 30 and the accommodation chamber 51 and the inside of the motor case 75 are directly communicated with each other. However, the present invention is not limited to this configuration. There is no problem even if the inside of the chamber 51 is communicated with the inside of the motor.

Next, the air passage 106 will be described in detail.
As shown in FIG. 14A, a bank portion 109 that protrudes toward the pump portion 80 is provided near the inlet 107 of the air passage 106. A gap 108 is provided between the bank portion 109 and the pump portion 80, and the air in the exhaust passage 104 flows into the air passage 106 beyond the bank portion 109. Further, by providing the bank portion 109 in the body portion 30, a groove portion 123 (bottom surface portion 123) is formed on the bank portion 109 on the side opposite to the air passage 106. Since water or the like from the exhaust passage 104 flows into the groove portion 123, it is possible to prevent water or the like from entering the air passage 106.

  (B) is a figure which shows another aspect of (a), and the clearance gap 108 is provided between the pump part 80 and the inlet_port | entrance 107. FIG. Since the air passage 106 is covered by the pump unit 80, water and dust in the storage chamber 51 are blocked by the pump unit 80 and do not directly enter the air passage 106.

  (C) is a figure which shows the further another aspect of (a), and the air channel | path 106 is provided in the bottom face part 123 of the body part 30. FIG. In this case, the inlet 107 of the air passage 106 is not covered with the pump unit 80, and the air from the exhaust passage 104 is directly introduced into the air passage 106 from the inlet 107.

  Returning to FIG. 10, the air passage 106 is provided in the vicinity of the mounting position of the pump unit (FIG. 9, reference numeral 80). The bank portion 109 is formed one step higher than the bottom surface portion 123 as a groove portion. The upper surface portion 125 is positioned one level higher than the bank portion 109.

Next, the silencing action of the negative pressure pump 10 will be described.
As shown in FIG. 15, when the motor (FIG. 8, reference numeral 70) operates, the outside air is sucked into the connection pipe 21 by the suction action of the pump unit 80. This intake air is drawn into the suction port 24 (arrow (1)).

  The intake air that has entered the intake port 24 enters the pump unit 80 through the intake hole 92 and is pressurized and discharged from the exhaust outlet 97 (arrow (2)), or is pumped from the intake hole 93 through the intake passage 103. Part 80 is pressurized and discharged from the exhaust outlet 98 (arrow (3)). Exhaust gas discharged from the upper and lower exhaust outlets 97 and 98 is discharged into the chamber chamber 66.

  As shown in FIG. 16, the air discharged to the chamber chamber 66 expends suddenly and consumes acoustic energy. The silenced exhaust gas is discharged through the notch communication passage 65 into the storage chamber 51 outside the chamber chamber 66 (arrow (4)). The discharged exhaust gas expands suddenly, consumes acoustic energy, and is further silenced.

  As shown in FIG. 17, the air compressed by the pump unit 80 is discharged into the storage chamber 51. The exhaust gas is guided to the communication path 105, is discharged to the muffler chamber 53 through the communication path 105, and rapidly expands (arrows (5), (6), (7)). Air suddenly expands and consumes acoustic energy. The silenced exhaust is discharged from the exhaust pipe 62 into the lower atmosphere (arrow (8)).

Next, the drainage action of the negative pressure pump 10 will be described.
As shown in FIG. 18A, water generated by condensation in the negative pressure pump 10 falls on the upper surface 34. The water that has fallen on the upper surface 34 flows from the accommodation chamber side recess 126 through the communication path 105 to the muffler chamber 53 (arrow (9)). As shown in (b), the water that has passed through the communication passage 105 flows through the bottom 59 of the silencer chamber (arrow (10)), is collected in the recess 61, and is discharged downward from the exhaust pipe 62 (arrow (11). )).

Next, the action of removing the abrasion powder of the negative pressure pump 10 will be described.
As shown in FIG. 19, a rotating body (vane 88 and rotor 87) is built in the pump unit (FIG. 5, reference numeral 80), and since this rotating body is in sliding contact with the wall, a slight amount of wear powder is generated. . The abrasion powder is mixed with the exhaust gas and flows into the exhaust passage 104 and further flows into the communication passage 122. The wear powder is prevented from flowing into the communication passage 122 by the barrier 124 and the upper surface portion 125 (arrow (12)). The wear powder that has passed over the barrier 124 near the entrance of the communication passage 122 is prevented from flowing into the back by the barrier 124 and the upper surface portion 125 (arrow (13)) because the communication path 122 meanders. (14)). The air from which the abrasion powder has been removed flows from the breathing hole 121 to the vicinity of the motor shaft 72 (arrow (15)) and is supplied into the motor (FIG. 8, reference numeral 70). A communication path 122 is provided while communicating from the exhaust path 104 to the breathing hole 121 of the motor, and the breathing hole 121 is the highest position in the communication path 122. Since the breathing hole 121 is at the highest position in the communication path 122, it is possible to prevent water from entering the motor 70.

Next, another aspect of FIG. 11 will be described. In addition, about the part which is common in FIG. 11, a code | symbol is diverted and description is abbreviate | omitted.
As shown in FIG. 20, an inner wall 63 is provided inside the cover body 50, and a space between the inner wall 63 and the outer wall 52 of the cover body 50 is formed as a muffler chamber 53. The communication path 131 is formed through the inner wall 63 of the cover body 50. By providing the communication path 131 in the cover body 50, the processing of the body part 30 can be reduced, and the processing cost of the body part 30 can be reduced.

Next, another aspect of FIG. 8 will be described. In addition, about the part which is common in FIG. 8, a code | symbol is diverted and description is abbreviate | omitted.
As shown in FIG. 21, the lid 101 is provided with exhaust outlets 97 and 98 through which exhaust flows into the storage chamber 51 from within the pump unit 80. From these exhaust outlets 97 and 98, pipe-like outlet pipes 132 and 133 are extended into the storage chamber 51. The air compressed by the pump unit 80 is discharged from the outlet pipes 132 and 133 and is rapidly expanded in the storage chamber 51 to consume acoustic energy. As a result, the silencing effect can be improved even in the storage chamber 51.

Next, another aspect of FIG. 12 will be described. In addition, about a site | part common with FIG. 12, a code | symbol is diverted and description is abbreviate | omitted.
As shown in FIG. 22, in the body part 30, an extension pipe part 134 that extends to the muffler chamber 53 is provided in the exhaust pipe 62. A plurality of fine holes 135 are provided in the extension pipe portion 134. The exhaust holes can be resonated by the fine holes 135, and the silencing effect can be improved.

According to the negative pressure pump acting as described above, the following effects can be obtained.
As shown in FIG. 8, the pump portion 80 is provided with exhaust outlets 97 and 98 on the opposite side surface 112 in contact with the body portion 30, and a rib 64 protruding toward the pump portion 80 side is provided on the bottom portion 56 of the cover body 50. A chamber chamber 66 that is integrally formed and covers the periphery of the exhaust outlets 97 and 98 is formed by the rib 64.

  With this configuration, by providing the chamber chamber 66 in the vicinity of the exhaust outlets 97 and 98, the chamber chamber 66 can provide an effect of silencing exhaust noise. In addition, since the rib 64 is only integrally formed at the bottom of the cover body 50, the chamber chamber 66 that silences the exhaust sound can be formed with a simple structure. That is, with a simple structure, the cost can be reduced and the exhaust sound from the pump unit 80 can be silenced.

As shown in FIG. 9, the exhaust outlets 97 and 98 are arranged on the circumference around the motor shaft 72 of the motor (FIG. 8, reference numeral 70), and the rib 64 covers the outer periphery of the exhaust outlets 97 and 98. It is formed in a cylindrical shape.
With this configuration, cutting can be easily performed by forming a cylindrical shape. In addition, since the cylindrical shape is formed in accordance with the arrangement of the exhaust outlets 97 and 98, the exhaust from the pump unit 80 can be surely passed through the chamber chamber 66.

As shown in FIG. 9, the rib 64 is formed with a notch communication passage 63 through which exhaust gas is passed from the inside to the outside of the rib 64.
With this configuration, exhaust is performed through the notch communication path 63 formed in the rib 64, so that a further silencing effect can be obtained.

In the embodiment, the vane pump is described as the negative pressure pump. However, the negative pressure pump is not limited to the vane pump.
Furthermore, the negative pressure pump of the present invention is suitable for a negative pressure pump for a vehicle for making the negative pressure chamber of a negative pressure booster provided in the vehicle negative pressure, but it is not intended to limit the application. However, it can be applied to general machines, general-purpose machines, and general equipment.

  The negative pressure pump of the present invention is suitable for a negative pressure pump for a vehicle for making negative pressure inside a negative pressure chamber of a negative pressure booster provided in the vehicle.

  DESCRIPTION OF SYMBOLS 10 ... Negative pressure pump, 30 ... Body part, 34 ... One side surface (upper surface), 50 ... Cover body, 51 ... Storage chamber, 56 ... Bottom part, 64 ... Rib, 65 ... Notch communication path, 66 ... Chamber room, 70 ... motor, 72 ... motor shaft, 80 ... pump section, 97, 98 ... exhaust outlet, 112 ... opposite side surface.

Claims (3)

A body portion as a base, a pump portion attached to one side surface of the body portion, a cover body having a storage chamber surrounding the pump portion and attached to one side surface of the body portion, and the other of the body portion In a negative pressure pump comprising a motor attached to the side surface of the motor and driving the pump unit,
The pump part is provided with an exhaust outlet on the opposite side surface in contact with the body part,
On the bottom of the cover body, a rib protruding to the pump part side is integrally formed,
A chamber chamber that covers the periphery of the exhaust outlet is formed by the rib. The negative pressure pump according to claim 1,
The exhaust outlet is disposed on a circumference around the motor shaft of the motor,
The negative pressure pump according to claim 1, wherein the rib is formed in a cylindrical shape covering an outer periphery of the exhaust outlet. The negative pressure pump according to claim 1 or 2,
The negative pressure pump according to claim 1, wherein the rib is formed with a notch communication passage through which exhaust gas passes from the inside to the outside of the rib.

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