JP5644569B2 - Vehicle negative pressure supply device - Google Patents

Description

  The present invention relates to a negative pressure supply device for a vehicle for supplying a negative pressure as a drive source to a booster that assists a brake operation force.

  In general, in a gasoline vehicle or the like that travels using an engine as a drive source, an intake negative pressure of the engine is used as a drive source of a booster that assists a driver to depress a brake pedal.

  However, since an engine is not mounted on an electric vehicle using an electric motor as a drive source, the intake negative pressure of the engine cannot be used as a drive source for the booster. For this reason, an electric vehicle is provided with a negative pressure supply device including an electric negative pressure pump that generates negative pressure, a negative pressure tank that stores negative pressure, and the like, and the negative pressure is supplied to the booster by the negative pressure supply device. It is made to supply (for example, refer patent document 1).

Japanese Patent Laid-Open No. 10-329701

  By the way, in the negative pressure supply device provided in the electric vehicle, the electric negative pressure pump and the negative pressure tank and the negative pressure tank and the booster are respectively connected by a negative pressure pipe, but an electric negative pressure pump is installed near the booster. When it is placed, the length of the negative pressure pipe connecting them will be shortened, and the space for securing negative pressure at the time of failure of the electric negative pressure pump will be reduced and the amount of negative pressure will be reduced. The problem that becomes faster. And if the length of the negative pressure pipe is short, the operation sound and vibration of the electric negative pressure pump cannot be absorbed by the negative pressure pipe, so that the problem that the operation sound and vibration propagate to the vehicle body also occurs.

  In addition, when the negative pressure tank is arranged near the side of the vehicle body, especially in a vehicle with a short length in front of the dash panel, the negative pressure tank is pushed back by a bumper during a vehicle collision and the dash panel is moved backward. Pushing it may affect the cabin.

  Therefore, the first object of the present invention is to secure a necessary negative pressure amount without increasing the size of the negative pressure tank, and to propagate the operating noise and vibration of the electric negative pressure pump into the passenger compartment. Another object of the present invention is to provide a negative pressure supply device for a vehicle that can prevent the negative pressure tank and the negative pressure pipe from being damaged in the event of a vehicle collision.

  Also, if only a flexible hose is used as the negative pressure pipe, it is thick and may move due to vibration, etc., so ensure sufficient clearance between the flexible hose and other parts in a small space. There is a problem that can not be. Since the flexible hose is held only by a clamp or the like and cannot be firmly fixed to the vehicle body, the flexible hose may interfere with other parts due to deformation.

  Accordingly, a second object of the present invention is to provide a negative pressure supply device for a vehicle that can prevent interference with other parts of the negative pressure pipe.

  In order to achieve the above object, the invention described in claim 1 is a booster that boosts the pedaling force of a driver applied to a brake pedal, an electric negative pressure pump that supplies negative pressure to the booster, and the electric negative pressure pump. In the negative pressure supply device for a vehicle having a negative pressure tank for storing the negative pressure generated in the vehicle, the booster and the electric negative pressure pump are arranged on one side of the vehicle in the left-right direction, and the negative pressure tank is arranged in the left-right direction The electric negative pressure pump, the negative pressure tank, the negative pressure tank, and the booster are respectively connected to each other through a negative pressure pipe.

  According to a second aspect of the present invention, in the first aspect of the present invention, the dash of the negative pressure pipe that communicates the electric negative pressure pump and the negative pressure pipe, and the negative pressure pipe that communicates the negative pressure tank and the booster. A portion that is routed along the panel is formed of a metal pipe, the metal pipe is fixed to the dash panel, and the metal pipe, the electric negative pressure pump, the negative pressure tank, and the booster are flexible. It is characterized by being connected by a hose.

  According to a third aspect of the present invention, in the second aspect of the present invention, a check valve is disposed inside the flexible hose that connects the metal pipe and the electric negative pressure pump.

  According to the first aspect of the present invention, the booster and the electric negative pressure pump are arranged on one side in the left-right direction of the vehicle, and the negative pressure tank is arranged at the center in the left-right direction of the vehicle. The negative pressure pipe that connects the negative pressure tank and the booster is relatively long, and the negative pressure pipe can secure the necessary negative pressure without increasing the negative pressure tank. The timing at which the brake becomes heavy at the time of failure can be delayed. And since the operation sound and vibration of the electric negative pressure pump are absorbed by the deformation of the relatively long negative pressure pipe, propagation of the operation sound and vibration to the vehicle interior is prevented.

  The negative pressure pipe extends from an electric negative pressure pump arranged at one side of the vehicle in the left-right direction to a negative pressure tank arranged at the center of the vehicle in the left-right direction. The negative pressure pipe can easily follow the deformation of the vehicle body at the time of a vehicle collision, and the damage can be suppressed because it is routed along the path returning to the booster disposed on the side.

According to a second aspect of the present invention, in the first aspect of the present invention, a negative pressure pipe that communicates the electric negative pressure pump and the negative pressure tank, and a dash of the negative pressure pipe that communicates the negative pressure tank and the booster. A portion that is routed along the panel is formed of a metal pipe, the metal pipe is fixed to the dash panel, and the metal pipe, the electric negative pressure pump, the negative pressure tank, and the booster are flexible. It is characterized by being connected by a hose.

  In addition, since the metal pipe fixed to the dash panel and the electric negative pressure pump are connected by a flexible hose, the operating sound and vibration of the electric negative pressure pump are effectively absorbed by the elastic deformation of the flexible hose and operated. Propagation of sound and vibration into the passenger compartment is reliably prevented.

  According to the invention described in claim 3, since the check valve is arranged inside the flexible hose connecting the metal pipe and the electric negative pressure pump, a negative pressure is secured in the negative pressure pipe when the electric negative pressure pump fails. The timing when the brake becomes heavy can be surely delayed. In this case, since the check valve is disposed on the side close to the electric negative pressure pump, a sufficient amount of negative pressure can be ensured in a relatively long negative pressure pipe extending from the check valve to the booster.

It is a disassembled perspective view which shows the basic composition of the negative pressure supply apparatus which concerns on this invention. It is the fracture | rupture perspective view which looked at the vehicle body front part which shows the arrangement structure of the negative pressure supply apparatus which concerns on this invention from the left front upper direction. It is a partial front surface of the vehicle body front part which shows the arrangement structure of the negative pressure supply apparatus which concerns on this invention. It is a fragmentary perspective view which shows the attachment state of an electric negative pressure pump. It is a partial side view (figure of the arrow A direction of FIG. 4) which shows the attachment state of an electric negative pressure pump. It is the B section enlarged detail drawing of FIG. It is a bottom view which shows the fixation structure to the front cross member of a bracket. It is a perspective view of a bracket. It is a perspective view of the electric negative pressure pump which shows the arrangement structure of an exhaust hose. It is a figure of the arrow C direction of FIG. It is a front view which shows the attachment structure of a negative pressure tank. It is a top view of the 1st bracket. It is the DD sectional view taken on the line of FIG. It is the perspective view which looked at the 1st bracket from the back side. It is a perspective view of the 2nd bracket.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is an exploded perspective view showing a basic configuration of a negative pressure supply device according to the present invention. The negative pressure supply device shown in FIG. 1 applies a negative pressure to a driver's pedal force applied to a brake pedal (not shown) of an electric vehicle. A booster 1 that boosts power by using it, an electric negative pressure pump 2 that supplies negative pressure to the booster 1, and a negative pressure tank 3 that stores the negative pressure generated by the electric negative pressure pump 2 are provided. The electric negative pressure pump 2 and the negative pressure tank 3 communicate with each other through a negative pressure pipe 4, and the negative pressure tank 3 and the booster 1 communicate with each other through a negative pressure pipe 5.

  A brake arm of a brake device (not shown) is connected to an end portion of the rod 6 protruding to the center portion of the booster 1, and when the driver depresses a brake pedal provided at the lower end of the brake arm, the rod 6 Is pressed, and the brake hydraulic pressure is generated in the master cylinder 7, but the driver's pedaling force is boosted by the booster 1 that operates using the force generated by utilizing the pressure difference between the atmospheric pressure and the negative pressure as a drive source. This reduces the physical burden on the driver.

  The electric negative pressure pump 2 is driven by an electric motor (not shown) provided integrally with the electric negative pressure pump 2 to generate a negative pressure. It is attached to the part. The negative pressure tank 3 is a cylindrical container-like tank, and a plate-like first bracket 9 is attached to the upper surface thereof.

  The negative pressure pipe 4 for communicating the electric negative pressure pump 2 and the negative pressure tank 3 includes flexible hoses 4a and 4b connected to the electric negative pressure pump 2 and the negative pressure tank 3, respectively, and the flexibility thereof. The hose 4a and 4b are comprised by the metal pipe 4c which connects. Here, the filter 10 is connected to the flexible hose 4a. A mounting bracket 11 used for mounting to the vehicle body (dash panel 14) is inserted and fixed in the middle of the metal pipe 4c.

  The negative pressure pipe 5 for communicating the negative pressure tank 3 and the booster 1 includes flexible hoses 5a and 5b connected to the negative pressure tank 3 and the booster 1, respectively, and these flexible hoses 5a and 5b. It is comprised by the metal pipe 5c which connects mutually. Here, an attachment bracket 12 for attachment to the vehicle body is attached to one end of the metal pipe 5c, and a grommet 13 is inserted through an intermediate portion.

  Next, the arrangement structure of the negative pressure supply device configured as described above on the vehicle body will be described with reference to FIGS.

  2 is a cutaway perspective view of the front part of the vehicle body showing the arrangement structure of the negative pressure supply device according to the present invention as seen from the upper left front, FIG. 3 is a partial front view of the front part of the vehicle body, and as shown in FIG. The booster 1 is disposed in the vehicle interior behind the dash panel 14 on the right side of the vehicle, and the electric negative pressure pump 2 is the front side of the vehicle body and on the same side as the side where the booster 1 is provided in the left-right direction of the vehicle. It is arranged on the right side. Specifically, the electric negative pressure pump 2 is disposed at an inner corner portion of a joint portion between the right front side member 15 and the front cross member 16, and is fixed to the front side member 15 and the front cross member 16 by the bracket 8. ing. Details of the mounting structure of the electric negative pressure pump 2 will be described later.

  The negative pressure tank 3 is arranged in the longitudinal direction (axial direction of the cylindrical container) along the front-rear direction in a floor tunnel 17 formed along the front-rear direction at the center in the left-right direction of the vehicle. As shown in FIG. 1, two pipe-like pipe connection portions 18 and 19 on the front end surface of the negative pressure tank 3 protrude from the front end edge of the floor tunnel 17 toward the front of the vehicle. Here, of the two upper and lower pipe connection parts 18, 19, one pipe connection part 18 is a pump side pipe connection part to which the flexible hose 4 b of the negative pressure pipe 4 connected to the electric negative pressure pump 2 is connected. The other pipe connection part 19 is a booster side connection part to which the flexible hose 5a of the negative pressure pipe 5 connected to the booster 1 is connected, but the pump side pipe connection part 18 is connected to the booster side pipe connection as shown in the figure. It is disposed above the portion 19.

  Thus, the negative pressure tank 3 is attached to the lower surface of the upper surface portion of the floor tunnel 17 by the first bracket 9 and the second bracket 20 coupled thereto, as shown in FIG. Details will be described later.

  By the way, in the said negative pressure piping 4, the part routed along the dash panel 14 is comprised by the metal pipe 4c, and the part connected to the electric negative pressure pump 2 and the negative pressure tank 3 (both sides of the metal pipe 4c) Part) is constituted by flexible hoses 4a and 4b. Here, as shown in FIG. 1, a pipe-like pipe connection portion 21 connected to an intake port (not shown) is projected at an intermediate height position of the electric negative pressure pump 2. One end of a flexible hose (intake hose) 4a of the negative pressure pipe 4 is inserted and fixed.

  Thus, the flexible hose 4a of the negative pressure pipe 4 extends horizontally from the side of the electric negative pressure pump 2 toward the center of the vehicle, rises vertically upward, and then substantially toward the right side. It is bent at a right angle and extends obliquely upward toward the dash panel 14. Here, as shown in FIG. 3, a check valve 22 is provided in the middle of the flexible hose 4 a closer to the negative pressure tank 3 than the filter 10 to prevent the backflow of air to the negative pressure tank 3 side. ing.

  The metal pipe 4 c connected to the flexible hose 4 a is routed along the front surface of the dash panel 14, and a part of the metal pipe 4 c is fixed to the front surface of the dash panel 14 by the mounting bracket 11 and the clamp 24. The metal pipe 4c rises upward from the flexible hose 4a to avoid interference with the steering shaft for steering operation, and then bypasses the upper side of the steering shaft and enters the floor tunnel 17 at the center in the vehicle width direction. It extends to the left side toward the arranged negative pressure tank 3, and an approximately L-shaped flexible hose 4b is connected to its end. And the front-end | tip of the flexible hose 4b is bend | folded at substantially right angle toward the vehicle rear, and is inserted in the piping connection part 18 of the upper side of the negative pressure tank 3, and is connected.

  The flexible hose 5a of the other negative pressure pipe 5 is formed in a substantially L shape and is disposed along the flexible hose 4b of the negative pressure pipe 4, and one end thereof is substantially perpendicular to the rear of the vehicle. And is inserted into and connected to a pipe connection portion 19 below the negative pressure tank 3. The metal pipe 5c connected to the flexible hose 5a is disposed along the metal pipe 4c below the metal pipe 4c of the negative pressure pipe 4 along the front surface of the dash panel 14, and the flexibility of the metal pipe 4c. A part of the metal pipe 5c passes through a circular hole (not shown) formed in the dash panel 14 below the metal pipe 4c on the negative pressure tank 3 side from the portion rising upward from the hose 4a. 14 is in the passenger compartment on the back side (rear side). A portion of the metal pipe 5c in the passenger compartment is fixed to the back surface (rear surface) of the dash panel 14 by screws 23 (see FIG. 1) inserted through the mounting bracket 12. A portion of the metal pipe 5c of the negative pressure pipe 5 along the front surface of the dash panel 14 and the metal pipe 4c of the negative pressure pipe 4 are fixed to each other by a clamp 24 and also fixed to the front surface of the dash panel 14. Further, a gap between a circular hole (not shown) formed in the dash panel 14 and the metal pipe 5c is sealed by the grommet 13 to prevent intrusion of dust and sound into the vehicle interior.

  The flexible hose 5 b connected to the end portion of the metal pipe 5 c in the vehicle interior rises toward the booster 1 disposed in the vehicle interior, and the end portion is connected to the booster 1.

  Next, details of the mounting structure of the electric negative pressure pump 2 will be described below with reference to FIGS.

  FIG. 4 is a partial perspective view showing the mounting state of the electric negative pressure pump, FIG. 5 is a partial side view thereof (a view in the direction of arrow A in FIG. 4), FIG. 6 is an enlarged detail view of a portion B in FIG. FIG. 8 is a perspective view of the bracket, and FIG. 8 is a bottom view showing a structure for fixing the bracket to the front cross member.

  As shown in FIG. 4, the electric negative pressure pump 2 is arranged in a state where it is erected perpendicularly to the inner corner of the joint portion between the right front side member 15 and the front cross member 16. That is, it is disposed in the inner corner portion of the front side member 15 on the right side, which is the front end portion of the vehicle, in the vicinity of the vehicle center side and in the vicinity of the rear side of the front cross member 16. The bracket 8 fixes the front side member 15 and the front cross member 16 to each other. The structure of the bracket 8 for fixing the electric negative pressure pump 2 will be described with reference to FIG.

  The bracket 8 is a sheet metal press-molded product, and a semi-circular cutout 8a is formed on the horizontal upper wall 8A thereof, and a stay 8B stands upright from the upper wall 8A and is L-shaped. The stay 8C is bent downward. Here, both the stays 8B and 8C are orthogonal to each other, and one stay 8B constitutes a mounting surface to the front side member 15, and an end of the stay 8B is in the vehicle front direction (the front of the vehicle in the mounting state of the bracket 8). A notch 25 opened in the direction) is formed. Further, the horizontal surface of the other stay 8C constitutes a mounting surface for the front cross member 16, and notches 26 facing each other are formed on both sides of the mounting surface (both sides in the vehicle left-right direction). Further, circular holes 27 are formed at two positions facing the notch 8a on the upper wall 8A, and nuts (not shown) are welded around the circular holes 27 on the lower surface of the upper wall 8A. .

  Further, a swing restricting portion 8D having a hexagonal shape in plan view extends downward from the upper wall 8A of the bracket 8, and this swing restricting portion 8D is located below the notch 8a formed in the upper wall 8A. It is formed concentrically with the notch 8a. The inscribed circle diameter of the swing restricting portion 8D and the inner diameter of the notch 8a are both set larger than the outer diameter of the lower half portion of the electric negative pressure pump 2.

  By the way, the electric negative pressure pump 2 has a cylindrical shape as shown in FIGS. 4 and 5, and the mounting bracket 2 a is radially formed from two opposing portions of the flange portion 2 </ b> A formed on the upper outer periphery thereof. A rubber mount 28 is inserted and fixed to each mounting bracket 2a.

  Thus, with the electric negative pressure pump 2 standing vertically, its lower half is passed through the notch 8a and the swing restricting portion 8D of the bracket 8 from above, and the two rubber mounts 28 are attached to the bracket. 8 is vertically supported by the bracket 8 by being placed on the upper wall 8A. In this state, the upper half of the electric negative pressure pump 2 projects vertically upward from the upper wall 8A of the bracket 8, and the lower half of the lower half of the bracket 8 is a hexagonal frame-shaped swing restricting portion 8D. Is surrounded by As shown in FIG. 4, a plurality of swing prevention mounts 29 (only one is shown in FIG. 4) are attached to the swing restricting portion 8D of the bracket 8, and each swing prevention mount 29 is electrically driven. Opposing to the outer periphery of the lower half of the electric negative pressure pump 2 with a predetermined clearance between the outer periphery of the lower half of the negative pressure pump 2 and contacting the lower half of the electric negative pressure pump 2 Therefore, the function of suppressing the oscillation of the electric negative pressure pump 2 is achieved.

  By mounting the two rubber mounts 28 attached to the electric negative pressure pump 2 on the upper wall 8A of the bracket 8 as described above, the electric negative pressure pump 2 is supported vertically suspended by the upper wall 8A of the bracket 8. Then, a metal collar (not shown) of each rubber mount 28 is aligned with the circular hole 27 formed in the upper wall 8A of the bracket 8, and a bolt 30 inserted from above into the metal collar is inserted into the circular hole 27 of the bracket 8. The electric negative pressure pump 2 is attached to the bracket 8 in a vertically placed state via the rubber mount 28 by screwing the end portion into a nut (not shown) welded to the lower surface of the upper wall 8A of the bracket 8.

  As shown in FIGS. 4 to 6, the bracket 8 to which the electric negative pressure pump 2 is attached has a rubber bush 31 fitted into a notch 25 formed at the tip of the stay 8 </ b> B. One point is attached to the inner surface of the front side member 15 by tightening the bolt 32 inserted into the nut 33 welded to the back side of the inner surface of the front side member 15 (vertical wall surface on the vehicle center side). Further, the horizontal plane of the stay 8C of the bracket 8 is applied to the horizontal plane constituting the lower surface of the front cross member 16 from below, and bolts 34 respectively inserted from below into the notches 26 formed at both ends of the front cross member 16 are provided. The bracket 8 is attached to the front cross member 16 at two points by screwing into a nut 35 (see FIG. 4) welded to a horizontal plane. Therefore, the electric negative pressure pump 2 is attached to the bracket 8 via the two rubber mounts 28, and the bracket 8 is attached to the front side member 15 and the front cross member 16.

  As shown in FIGS. 4 and 5, a harness 36 for supplying drive power to the electric negative pressure pump 2 is routed around the bracket 8 and wired to the end portion of the harness 36. The coupler 37 thus attached is attached to the end of the stay 8B of the bracket 8. Here, as shown in FIG. 5, in order to secure a space for a tool for tightening the bolt 32 when the bracket 8 is attached to the front side member 15, the harness 36 is bent around the bolt 32 into a U shape. Have been routed.

  Further, an exhaust port (not shown) is opened downward at an intermediate height position of the electric negative pressure pump 2, and an exhaust hose 38 is connected to the exhaust port. Here, the arrangement structure of the exhaust hose 38 will be described below with reference to FIGS. 9 and 10.

  9 is a perspective view of the electric negative pressure pump showing the arrangement structure of the exhaust hose, FIG. 10 is a view in the direction of arrow C in FIG. 9, and the exhaust hose 38 extends from the exhaust opening that opens to the electric negative pressure pump 2. The electric negative pressure pump is bent after being extended downward and rises obliquely upward along the outer periphery of the lower half of the electric negative pressure pump 2, and then is vertically raised and then bent at a substantially right angle and horizontally extended. It rises vertically above the top of 2. The exhaust hose 38 rising vertically is bent at a substantially right angle and extends horizontally, its end is bent at a substantially right angle downward, and its tip opens toward the electric negative pressure pump 2. Therefore, the exhaust is discharged downward from the tip of the exhaust hose 38, and the discharged exhaust is blown to the electric negative pressure pump 2.

  As shown in FIG. 2, the vertically rising portion of the exhaust hose 38 is an exhaust hose (intake hose) 4 a of the negative pressure pipe 4 connected to the pipe connection part (intake port) 21 of the electric negative pressure pump 2. It is fixedly held (clamped) by a clamp 39 at a vertically rising portion.

  Next, the details of the mounting structure of the negative pressure tank 3 will be described below with reference to FIGS.

  FIG. 11 is a front view showing the attachment structure of the negative pressure tank, FIG. 12 is a plan view of the first bracket, FIG. 13 is a sectional view taken along the line DD in FIG. 12, and FIG. FIG. 15 is a perspective view of the second bracket.

  As described above, the negative pressure tank 3 is arranged in the longitudinal direction of the vehicle in the longitudinal direction of the vehicle in the floor tunnel 17 formed in a bulged upward state at the vehicle lateral center of the vehicle body floor. As shown in FIG. 11, it is attached to the upper surface of the floor tunnel 17 via the first and second brackets 9 and 20 divided into two.

  The first bracket 9 is a rectangular sheet metal member that is attached to the upper surface of the negative pressure tank 3, and as shown in FIGS. 12 to 14, is formed in a cross-sectional hat shape in which the central portion in the width direction is raised upward. A circular hole 40 is formed in two places (two places in the vehicle front-rear direction in the mounted state) in the central portion that protrudes upward. A nut 41 is welded around each circular hole 40 on the back surface of the central portion of the first bracket 9 as shown in FIG. In addition, circular holes 42 are respectively formed at two locations on the left and right flanges 9a of the first bracket 9 (two locations in the vehicle front-rear direction in the mounted state).

  The second bracket 20 is a sheet metal member that is attached to the lower surface of the upper surface portion of the floor tunnel 17, and is bent in a step shape as shown in FIG. 15, and the upper mounting surface 20A thereof. Circular holes 43 are formed at two end portions (two locations in the vehicle front-rear direction in the mounted state). In addition, bolt insertion holes 44 are formed at two locations on the lower mounting surface 20B of the second bracket 20, and these bolt insertion holes 44 are cut to open toward the right side of the vehicle in the mounted state. Each notch 44a is formed.

  Thus, as shown in FIG. 11, the first bracket 9 has a flange 9a applied to the upper surface of a plurality of block-shaped mounting seats 45 erected on the upper surface of the negative pressure tank 3, and two locations of each flange 9a. Are attached to the upper surface of the negative pressure tank 3 by screwing screws 46 inserted from above into the mounting seats 45.

  On the other hand, rubber bushes 47 are respectively fitted into the bolt insertion holes 44 formed at two places on the lower mounting surface 20B of the second bracket 20, and the second bracket 20 is mounted on the lower mounting surface thereof. 20B is applied to the central portion protruding above the first bracket 9, and a bolt 48 inserted through each rubber bush 47 from above is screwed into a nut 41 welded to the back surface of the first bracket 9 to thereby remove the rubber bush 47. And is attached to the first bracket 9.

  Thus, the negative pressure tank 3 to which the first and second brackets 9 and 20 are attached as described above is protruded downward from the upper surface of the floor tunnel 17 as shown in FIG. The upper stage side of the second bracket 20 with two stud bolts 49 (only one shown in FIG. 11) passed through the circular holes 43 formed in the mounting surface 20A on the upper stage side of the second bracket 20 The mounting surface 20A is applied to the upper surface portion of the floor tunnel 17 from below, and the negative pressure tank 3 is fixed to the first and second brackets 9 and 20 and the rubber bush by tightening the nuts 50 screwed into the stud bolts 49, respectively. It is attached to the upper surface portion of the floor tunnel 17 through 47.

  Thus, in the negative pressure supply device including the electric negative pressure pump 2 and the negative pressure tank 3 attached to the vehicle body by the above-described attachment structure, the negative pressure in the booster 1 detected by a negative pressure sensor (not shown) is detected. When it is insufficient, the electric negative pressure pump 2 is driven, and the negative pressure generated by the electric negative pressure pump 2 is stored in the negative pressure tank 3 through the negative pressure pipe 4.

  When the driver depresses the brake pedal, the driver's pedaling force is boosted by the booster 1 and transmitted to the master cylinder 7, thereby reducing the physical burden on the driver. When the negative pressure in the negative pressure tank 3 is insufficient due to the consumption of the negative pressure in the booster 1, the electric negative pressure pump 2 is driven to replenish the negative pressure tank 3 with the negative pressure.

  In the above, in the negative pressure supply device according to the present invention, the booster 1 and the electric negative pressure pump 2 are arranged on the right side of the vehicle, and the negative pressure tank 3 is arranged in the center in the left-right direction of the vehicle. The negative pressure tanks 3 and 5 and the negative pressure pipes 4 and 5 for connecting the negative pressure tank 3 and the booster 4 to each other are relatively long. The amount can be secured, and the timing at which the brake becomes heavy when the electric negative pressure pump 2 fails can be delayed. And since the operation sound and vibration of the electric negative pressure pump 2 are absorbed by the deformation of the relatively long negative pressure pipes 4 and 5, propagation of the operation sound and vibration to the passenger compartment is prevented. In particular, in the present embodiment, since the check valve 22 is disposed inside the flexible hose 4a that connects the metal pipe 4c of the negative pressure pipe 4 and the electric negative pressure pump 2, a negative pressure is generated when the electric negative pressure pump 2 fails. The pressure can be secured in the negative pressure pipes 4 and 5, and the timing at which the brake becomes heavy can be surely delayed. In this case, since the check valve 22 is disposed on the side close to the electric negative pressure pump 2, a sufficient amount of negative pressure can be secured in the relatively long negative pressure pipes 4 and 5 extending from the check valve 22 to the booster 1. it can.

  Further, the negative pressure pipe 4 extends from the electric negative pressure pump 2 arranged at one side of the vehicle in the left-right direction to the negative pressure tank 3 arranged at the center in the left-right direction of the vehicle, and the negative pressure pipe 5 is a negative pressure tank. 3 returns to the booster 1 arranged on the same side as the electric negative pressure pump 2, so that these negative pressure pipes 4 and 5 can easily follow the deformation of the vehicle body at the time of a vehicle collision, and the damage is suppressed. It is done.

  Further, in the present embodiment, the portions of the negative pressure pipes 4 and 5 that are routed along the dash panel 14 are configured by the metal pipes 4c and 5c that are thinner than the flexible hoses 4a and 4b and 5a and 5b, respectively. Since the metal pipes 4c and 5c are fixed to the dash panel 14, the piping positions of the metal pipes 4c and 5c on the dash panel 14 in which many other pipes such as brake pipes are routed are stabilized, and Since the arrangement space of the pipes 4c and 5c can be small, interference between the metal pipes 4c and 5c and other parts can be prevented. And the metal pipes 4c and 5c routed in the left-right direction of the vehicle along the dash panel 14 can be prevented from being damaged due to contact with other parts moving rearward of the vehicle due to deformation of the vehicle body at the time of a vehicle collision.

  Further, since the metal pipe 4c fixed to the dash panel 14 and the electric negative pressure pump 2 are connected by the flexible hose 4a, the operation sound and vibration of the electric negative pressure pump 2 are effective due to the elastic deformation of the flexible hose 4a. And the propagation of operating noise and vibration into the passenger compartment is reliably prevented.

  In the above description, the present invention is applied to a negative pressure supply device provided in an electric vehicle using an electric motor as a drive source. However, the present invention is a hybrid using both an engine and an electric motor as a drive source. Of course, the present invention can be similarly applied to a negative pressure supply device provided in a vehicle.

DESCRIPTION OF SYMBOLS 1 Booster 2 Electric negative pressure pump 3 Negative pressure tank 4 Negative pressure pipe 4a, 4b Negative pressure pipe flexible hose 4c Negative pressure pipe metal pipe 5 Negative pressure pipe 5a, 5b Negative pressure pipe flexible hose 5c Negative Metal pipe for pressure piping 14 Dash panel 15 Front side member 16 Front cross member 17 Floor tunnel 22 Check valve

Claims (3)

A vehicle having a booster that boosts a driver's pedaling force applied to a brake pedal, an electric negative pressure pump that supplies negative pressure to the booster, and a negative pressure tank that stores negative pressure generated by the electric negative pressure pump In the negative pressure supply device,
The booster and the electric negative pressure pump are arranged at one side of the vehicle in the left-right direction, the negative pressure tank is arranged at the center in the left-right direction of the vehicle, and the electric negative pressure pump, the negative pressure tank, and the negative pressure tank And a booster connected to each other by a negative pressure pipe, respectively. The negative pressure pipe that communicates the electric negative pressure pump and the negative pressure tank, and the portion that is routed along the dash panel of the negative pressure pipe that communicates the negative pressure tank and the booster are configured with metal pipes, 2. The vehicle according to claim 1, wherein the metal pipe is fixed to the dash panel, and the metal pipe and the electric negative pressure pump, the negative pressure tank, and the booster are connected to each other by a flexible hose. Negative pressure supply device. The negative pressure supply device for a vehicle according to claim 2, wherein a check valve is disposed inside the flexible hose that connects the metal pipe and the electric negative pressure pump.

Images