WO2019207385A1

WO2019207385A1 - Damper unit and hydraulic pressure control unit comprising such a damper unit

Info

Publication number: WO2019207385A1
Application number: PCT/IB2019/052800
Authority: WO
Inventors: 坂本貴紀
Original assignee: ローベルトボッシュゲゼルシャフトミットベシュレンクテルハフツング
Priority date: 2018-04-23
Filing date: 2019-04-05
Publication date: 2019-10-31
Also published as: JP2019188931A; JP7060680B2; JPWO2019207385A1

Abstract

The invention provides a damper unit (37,80) which can reduce brake fluid pulsations, which occur when a pump (60) is driven, according to the characteristic of a hydraulic pressure control unit (50) and which can be easily mounted in the hydraulic pressure control unit (50). The damper unit (37,80) includes a damping chamber (81) that dampens pulsations of a brake fluid and a pulsation absorbing member (83) disposed inside the damping chamber (81). The pulsation absorbing member (83) includes at least three elastomer layers having at least two different levels of rebound resilience, wherein of the at least three elastomer layers, the elastomer layer having the highest rebound resilience is disposed between the other elastomer layers.

Description

\ ¥ 0 2019/207385 卩（： 17132019/052800

[Document Name] Description

Hydraulic control unit for a brake system for a vehicle

【Technical field】

[0 0 0 1]

The present invention relates to a hydraulic control unit for a brake system for a vehicle, and more particularly to a hydraulic control unit including a pump for increasing the hydraulic pressure of the brake liquid.

[Background]

[0 0 0 2]

As a brake system for a conventional vehicle, a main channel for communicating the master cylinder and the wheel cylinder, shake of the main channel -畐escape key solution ^| and flow channel, blur in the middle portion of the auxiliary flow channel - the gas-liquid Some have a supply flow path to supply and a hydraulic pressure circuit to have.

[0 0 0 3]

For example, the upstream end in the flow of brake fluid in the secondary flow path is connected to the wheel cylinder side area of the main flow path with reference to the intake valve, and the downstream end of the secondary flow path The section is connected to a region on the master cylinder side of the main flow path with the intake valve as a reference. In addition, the upstream end 咅 5 in the flow of brake fluid in the supply flow path communicates with the master cylinder, and the downstream end of the supply flow path is based on the release valve in the 畐 1] flow path. And is connected to the suction side of a pump provided in that region. In addition, the first switching valve is provided in the area on the master cylinder side of the main flow path with respect to the connection with the downstream end of the flow path 1) flow path. Is provided with a second switching valve.

[0 0 0 4]

For example, the hydraulic pressure control unit is configured by a filling valve, a relaxation valve, a pump, a first switching valve, a second switching valve, a base body in which they are incorporated, and a controller that controls their operation. In the hydraulic control unit, the hydraulic pressure of the hydraulic circuit is controlled by controlling the operation of the intake valve, the relief valve, the pump, the first switching valve, and the second switching valve.

[0 0 0 5] ¥ 0 2019/207385? € 1/162019/052800 In particular, increase the brake fluid pressure in the wheel cylinder regardless of the brake operation status at the input 咅 5 of the brake system (eg brake pedal, etc.) When the need arises, the pump is driven with the intake valve open, the release valve closed, the first switching valve closed, and the second switching valve open.

[0 0 0 6]

When the pump is driven, the pulsation generated in the brake fluid is transmitted from the brake system to the vehicle engine room, and noise may be generated. This noise can be so loud that the user (driper) feels uncomfortable. For this reason, a conventional hydraulic pressure control unit for a brake system has been proposed which reduces pulsation generated when the pump is driven. For example, a hydraulic control unit of a brake system described in Patent Document 1 includes one pump in one hydraulic circuit, and pulsation of brake fluid discharged from the pump on the discharge side of the pump. It is equipped with a damper unit that attenuates.

[Prior art documents]

[Patent Literature]

[0 0 0 7]

[Patent Document 1] Japanese Patent Laid-Open No. 2 0 1 7-0 6 1 2 4 6

Summary of the Invention

[Problems to be solved by the invention]

[0 0 0 8]

In recent brake systems, the booster may be downsized or omitted for the purpose of improving the mountability of the brake system in the vehicle. In such a brake system, the hydraulic pressure of the brake fluid in the wheel cylinder is often insufficient, and the number of times the pump is driven increases. That is, in such a brake system, noise due to pulsation generated when the pump is driven is more likely to be generated. For this reason, in recent years, there has been a demand for further reduction of pulsation generated when the pump is driven.

[0 0 0 9]

As a configuration for further reducing the pulsation generated when the pump is driven, according to the configuration of the hydraulic pressure control unit of the brake system described in Patent Document 1, a pulsation damper in which a plurality of metal diaphragms are stacked. A hydraulic braking device having a par is proposed. However, a structure in which a plurality of identical metal diaphragms are stacked has a limit to cope with pulsations caused by the characteristics of the hydraulic control unit based on the output of the pump motor and the rotational speed.

[0 0 1 0]

The present invention has been made against the background of the above-mentioned problems, and the pulsation generated when the pump is driven can be reduced according to the characteristics of the hydraulic pressure control unit, and can be easily attached to the hydraulic pressure control unit. The purpose is to provide a damper unit that can be used.

[Means for Solving the Problems]

[0 0 1 1]

The damper unit according to the present invention is a damper unit having a damping chamber for damping the pulsation of the brake fluid and five pulsation absorbing rods disposed in the damping chamber, wherein the pulsation absorbing member includes at least two pulsation absorbing members. The structure includes three elastomer layers having different resilience, and the elastomer layer having the highest resilience among the three elastomer layers is disposed between the other elastomer layers.

【The invention's effect】

[0 0 1 2]

In the hydraulic control unit according to the present invention, since the pulsation absorbing member includes at least two elastomer layers having different rebound resilience, the liquid caused by the output of the pump motor of the hydraulic control unit and the difference in rotational speed It is possible to provide a damper unit having a pulsation absorbing member corresponding to the pulsation unique to the pressure control unit.

[0 0 1 3]

In addition, since the elastomer layer having the highest resilience among the three elastomer layers is arranged between the other elastomer layers, the vibration of the brake fluid is damped and simultaneously controlled. Since the action works, the effect of converging the pulsation can be further improved.

[Brief description of the drawings]

[0 0 1 4]

FIG. 1 is a diagram showing an example of a system configuration of a brake system according to an embodiment of the present invention. \ ¥ 0 2019/207385? € 1/162019/052800

FIG. 2 is a partial cross-sectional view illustrating an example of a mounting state of a pump and a damper unit on a base body in the hydraulic control unit of the brake system according to the embodiment of the present invention.

FIG. 33 is a cross-sectional view according to another embodiment of the damper unit in the hydraulic control unit of the brake system according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view according to another embodiment of the damper unit in the hydraulic pressure control unit of the brake system according to the embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0 0 1 5]

Hereinafter, a hydraulic control unit according to the present invention will be described with reference to the drawings.

In the following, a case where the brake system including the hydraulic control unit according to the present invention is mounted on a four-wheeled vehicle is described, but the brake system including the hydraulic control unit according to the present invention is It may be mounted on vehicles other than automobiles (two-wheeled vehicles, trucks, passes, etc.). In addition, the configuration, operation, and the like described below are examples, and the brake system including the hydraulic control unit according to the present invention is not limited to the configuration, operation, and the like. Moreover, in each figure, the same or similar member or part is attached | subjected with the same code | symbol, or attaching | subjecting code | symbol is abbreviate | omitted. Further, for the fine structure, the illustration is appropriately simplified or omitted.

[0 0 1 6]

Embodiment.

Below, the brake system 1 which concerns on this Embodiment is demonstrated.

The configuration and operation of the brake system 1 according to the present embodiment will be described.

FIG. 1 is a diagram showing an example of a system configuration of a brake system according to an embodiment of the present invention.

[0 0 1 7]

As shown in FIG. 1, the brake system 1 is mounted on a vehicle 100 and has a main flow path 1 3 that connects the master cylinder 1 1 and the wheel cylinder 1 2, and brake fluid in the main flow path 1 3. And a hydraulic circuit 2 having a secondary flow path 14 for releasing the fluid, a supply flow path 15 for supplying the brake fluid to the secondary flow path 14, and a hydraulic pressure circuit 2. Hydraulic circuit 2 is filled with brake fluid \ ¥ 0 2019/207385? € 1/162019/052800 The brake system 1 according to the present embodiment includes two hydraulic circuits 2 3, 2 as the hydraulic circuit 2.

2 Has a kite. The hydraulic circuit 2 3 is a hydraulic circuit that connects the master cylinder 1 1 and the wheels R 1_, “R wheel cylinder 1 2 through the main flow path 1 3. The hydraulic circuit 2 匕 is the main flow path 1. 3 is a hydraulic circuit that connects the master cylinder 1 1 and the wheel “1_, RR wheel cylinder 1 2”. These hydraulic circuits 2 3,

2 匕 has the same configuration except that the communicating wheel cylinders 12 are different.

[0 0 1 8]

The master cylinder 11 has a built-in piston (not shown) that reciprocates in conjunction with a brake pedal 16, which is an example of the input rod 5 of the brake system 1. A booster 17 is interposed between the brake pedal 16 and the piston of the master cylinder 11, and the pedaling force of the user is boosted and transmitted to the piston. The wheel cylinder 12 is provided on the brake caliper 18. When the brake fluid pressure in the wheel cylinder 12 increases, the brake pad 19 in the brake caliper 18 is pressed against the □-evening 20 to brake the wheel.

[0 0 1 9]

The upstream end of the subchannel 1 4 is connected to the middle portion 1 3 ₃ of the main channel 1 3, and the downstream end of the subchannel 1 4 is connected to the middle portion 1 3 1 of the main channel 1 3 Has been. Further, the upstream end of the supply flow channel 15 communicates with the master cylinder 11 1, and the downstream end of the supply flow channel 15 is connected to the middle portion 1 4 3 of the sub flow channel 14. . Here, the upstream end of the sub-channel 14 corresponds to the second upstream end of the present invention. The downstream end of the sub-channel 14 corresponds to the first downstream end of the present invention. The middle part 1 3 13 of the main flow path 13 corresponds to the second middle part of the present invention. The upstream end of the supply channel 15 corresponds to the first upstream end of the present invention. The middle part 14 3 of the sub-channel 14 corresponds to the first middle part of the present invention.

The upstream side in the sub-channel 14 refers to the upstream side in the flow of the brake fluid when the pump is driven and the brake fluid is returned from the wheel cylinder to the master cylinder. The side means the lower 5¾ side in the flow of the brake liquid.

[0 0 2 0]

In the main flow path 1 3, the area between the middle part 1 3 匕 and the middle part 1 3 ₃ (the area on the wheel cylinder 1 2 side with reference to the middle part 1 3 匕) ）) 3 1 is provided.畐 1] Upstream of channel 1 4 ¥ 0 2019/207385? 1/162019/052800 In the region between the side end and the middle part 1 4 3, a relief valve (8 V) 3 2 is provided. An accumulator 33 is provided in a region of the auxiliary flow path 14 between the release valve 3 2 and the intermediate rod 5 1 4 3. The intake valve 31 is, for example, an electromagnetic valve that opens when not energized and closes when energized. The release valve 32 is, for example, an electromagnetic valve that closes when not energized and opens when energized.

[0 0 2 1]

In addition, a pump 60 is provided in a region between the intermediate portion 14 ₃ and the downstream end portion of the sub flow path 14. The suction side of the pump 60 communicates with the intermediate portion 14 3. The discharge side of the pump 60 communicates with the downstream side end of the sub-channel 14. Specifically, the brake system 1 includes a suction flow path 14 2 and a discharge flow path 1 40 which are part of the sub flow path 14 as a configuration of the hydraulic pressure control unit 50. The suction flow path 1 4 2 constitutes a flow path between the upstream end of the sub flow path 1 4 and the suction side of the pump 60, and the discharge flow path 1 4 0 is connected to the discharge side of the pump 60. It forms a flow path between the downstream end of the sub flow path 14.

[0 0 2 2]

Here, the hydraulic pressure control unit 50 includes a damper unit 80 that attenuates the pulsation of the brake fluid discharged from the pump 60 on the discharge flow path. Specifically, the discharge side of the pump 60 is connected to the inflow opening 8 1 する through which the brake fluid of the damper unit 80 flows, and the outflow opening through which the brake fluid temporarily stored in the damper unit 80 flows out. 8 1 0 and the downstream end of the secondary flow path are connected. In the following description, the flow path between the discharge side of the pump and the inflow opening 8 1 を is defined as the first discharge flow path 1 4 0 3, the outflow opening 8 1 0 and the downstream end of the sub flow path. Each of the three flows constituting the second discharge flow is referred to as a first discharge flow 1 4 0 匕.

[0 0 2 3]

A first switching valve (II 5 V) 3 5 is provided in an area on the master cylinder 11 side with respect to the middle 3 5 1 3 匕 in the main flow path 13. The supply flow path 15 is provided with a second switching valve (HSV) 3 6 and a damper unit 3 7. The damper unit 37 is provided in a region of the supply flow path 15 between the second switching valve 36 and the downstream end. The first switching valve 35 is, for example, an electromagnetic valve that opens when not energized and closes when energized. The second switching valve 36 is, for example, an electromagnetic valve that closes in a non-energized state and opens in an energized state. In this embodiment, a configuration is shown in which damper units 3 7 and 80 are provided in both the discharge flow path 14 0 and the supply flow path 15. However, it may be provided only in one of them depending on the installation space and the required pulsation damping characteristics.

[0 0 2 4]

Inlet valve 3 1 and release valve 3 2 and accumulator-even 3 3 and pump 6 0 and 1st switching valve 3 5 and 2nd switching valve 3 6 and damper unit 3 7 and damper unit 8 0 1 3, 畐 0 channel 14, and supply channel 15 are provided in the base body 5 1 formed therein. 5 rods (fill valve 3 1, release valve 3 2, accumulator-even 3 3, pump 60, first switching valve 3 5, second switching valve 3 6, damper unit 3 7 and damper unit 8 0 ) May be provided collectively on one base 51 or may be provided separately on a plurality of bases 51.

[0 0 2 5]

At least the hydraulic pressure control unit 50 is configured by the base 51, the respective rods 5 provided on the base 51, and the controller (巳 0 11) 52. In the hydraulic pressure control unit 50, the operation of the intake valve 31, the relief valve 32, the pump 60, the first switching valve 35, and the second switching valve 36 is controlled by the controller 52. As a result, the hydraulic pressure of the brake fluid in the wheel cylinder 12 is controlled. That is, the controller 52 controls the operations of the intake valve 31, the release valve 3 2, the pump 60, the first switching valve 35, and the second switching valve 36.

[0 0 2 6]

芾 I] Controller 5 2 may be one or may be divided into a plurality. Further, 芾 I] controller 5 2 may be attached to base 5 1, or may be attached to another 咅 5 material. Also, one or all of the controllers 52 may be composed of, for example, a microcomputer, a microphone □ processor unit, etc., or may be composed of updatable firmware, etc. 0 It may be a program module that is executed by a command from II.

[0 0 2 7]

For example, the controller 52 performs the following hydraulic pressure control operations in addition to the well-known hydraulic pressure control operations (eighth control operation, fifth control operation, etc.).

The intake valve 3 1 is opened, the release valve 3 2 is closed, the first switching valve 3 5 is opened, and the second switching valve 3 6 is closed. When brake pedal 16 is operated, brake pedal 16 ¥ 0 2019/207385? € 1/162019/052800 From the detection signal of the position sensor and the detection signal of the hydraulic pressure sensor of the hydraulic pressure circuit 2, it is detected whether the hydraulic pressure of the hydraulic pressure circuit 2 is insufficient or insufficient. Then, the controller 52 starts the active pressure increase control operation.

[0 0 2 8]

In the active pressure increase control operation, the controller 5 2 keeps the intake valve 3 1 in an open state so that the brake fluid flows from the middle 5 1 3 の of the main flow path 1 3 to the wheel cylinder 1 2. enable. Further, the controller 52 restricts the flow of brake fluid from the wheel cylinder 12 to the accumulator 33 by leaving the release valve 32 closed. In addition, the controller 52 closes the first switching valve 35 so that the brake fluid in the flow path extending from the master cylinder 11 to the middle part 13 of the main flow path 13 without passing through the pump 60 Limit flow. Further, the controller 52 opens the second switching valve 36 so that the brake fluid flows in the flow path from the master cylinder 11 through the pump 60 to the middle part 13 of the main flow path 13. (The controller 52 also increases (increases) the brake fluid pressure in the wheel cylinder 12 by driving the pump 60.)

[0 0 2 9]

When it is detected that the shortage or avoidance of the hydraulic pressure in the hydraulic circuit 2 is detected, the controller 5 2 opens the first switching valve 3 5, closes the second switching valve 3 6, and pump 6 By stopping the driving of 0, the active pressure increase control operation ends.

[0 0 3 0]

Here, when the pump 60 is driven, the pulsation generated in the brake fluid may be transmitted to the wheel cylinder 12 through the sub flow path 14 and the main flow path 13. This pulsation is transmitted to the engine room housing the hydraulic pressure I] control unit 50 of the brake system 1 and noise may be generated. This noise can be so loud that the user (driper) feels uncomfortable. For this reason, it is important to reduce the pulsation generated when the pump 60 is driven.

[0 0 3 1]

Therefore, in the brake system 1 according to the present embodiment, that is, the hydraulic pressure control unit I 50, the brake fluid discharged from the pump 60 flows into the damper unit 80. The brake fluid that has flowed into the damper unit 80 flows downstream from the damper unit 80 after pulsation is attenuated in the damper unit 80. \ ¥ 0 2019/207385? € 1/162019/052800 Therefore, the brake system 1 according to the present embodiment, that is, the hydraulic pressure control unit 50, can reduce the pulsation that occurs when the pump 60 is driven.

[0 0 3 2]

In the above-described active pressure increase control, the user operates (depresses) the brake pedal 16 and the pump 60 is driven with the second switching valve 36 opened. For this reason, the pulsation generated in the brake fluid propagates to the brake pedal 16 via the supply flow path 15 and the master cylinder 11, which gives the user a feeling of strangeness. Therefore, the brake system 1 according to the present embodiment, that is, the hydraulic pressure control unit 50 is preferably provided with a damper unit 37 as shown in FIG. This is because the damper unit 3 7 can attenuate the pulsation of the brake fluid propagating from the pump 60 to the brake pedal 16.

[0 0 3 3]

When the damper unit 37 is provided in the brake system 1 in which the booster 17 is omitted, the damper unit 37 is connected to the upstream end of the supply flow path 15 and the second switching valve 3. It may be provided in an area between 6. By installing the damper unit 37 in such a position, when the user depresses the brake pedal 16, the brake fluid can flow into the damper unit 37, and the hydraulic circuit 2 that is transmitted to the brake pedal 16. The reaction force of the brake fluid inside is reduced. Therefore, when the user depresses the brake pedal, the same depression amount of the brake pedal 16 as that of the brake system 1 including the booster 17 can be obtained. For this reason, the user can obtain a feeling of use similar to that of the brake system 1 including the booster device 17 in the brake system 1 in which the booster device 17 is omitted.

[0 0 3 4]

An example of the configuration when the pump 60 and the damper unit 80 are mounted on the base 51 in the hydraulic pressure I] control unit 50 of the brake system 1 according to the present embodiment will be described.

FIG. 2 is a partial cross-sectional view showing an example of a state in which the pump and the damper unit are mounted on the base body in the hydraulic control unit of the brake system according to the embodiment of the present invention. FIG. 2 shows a state in which the drive shaft 5 7 that drives the piston 62 of the pump 60 is removed. Therefore, in FIG. 2, the drive shaft 5 7 and the drive shaft 5 7 \ ¥ 0 2019/207385? € 1/162019/052800 The formed eccentric part 5 7 3 is illustrated by an imaginary line (two-dot chain line).

[0 0 3 5]

As shown in FIG. 2, the base 51 is formed with a storage chamber 59 in which a drive shaft 57 for driving the piston 62 of the pump 60 is provided. The storage chamber 59 is a bottomed hole formed in the outer wall of the base 51. The base 51 is formed with a storage chamber 53 for storing the pump 60. These accommodation chambers 53 are stepped through holes penetrating from the outer wall of the base body 51 to the accommodation chamber 59.

[0 0 3 6]

The pump 60 stored in the storage chamber 53 includes a cylinder 61, a piston 62, and the like. The cylinder 61 is formed in a bottomed cylindrical shape having a bottom portion 6 1 匕. One end side of the piston 62 is accommodated in the cylinder 61. A space surrounded by the inner peripheral surface of the cylinder 61 and the one end of the piston 62 is a pump chamber 6 3. The piston 62 can reciprocate in the axial direction of the cylinder 61. In addition, an end portion 6 2 3 which is an end portion on the other end side of the piston 62 protrudes into the accommodation chamber 59. Furthermore, an annular seal rod 5 material 66 is attached to the rod 5 accommodated in the cylinder 61 of the piston 62. The seal member 66 prevents leakage of brake fluid between the outer peripheral surface of the piston 62 and the inner peripheral surface of the cylinder 61.

[0 0 3 7]

In addition, a cylinder 6 1 (this is a panel 6 7 is accommodated between the bottom 6 1 匕 and the piston 6 2, that is, in the pump chamber 6 3. With this panel 6 7, the piston 6 2 is always in the accommodating chamber. 5 is biased toward the side 9. As a result, the end 6 2 3 of the piston 6 2 is in contact with an eccentric portion 5 7 3 formed on the drive shaft 5 7 in the housing chamber 59. The center position of the part 5 73 is eccentric with respect to the rotation center of the drive shaft 5 7. Therefore, when the drive shaft 5 7 is rotated by a drive source (not shown), the eccentric part 5 7 8 is The eccentric shaft 5 7 3 is eccentrically rotated with respect to the center of rotation of the drive shaft 5 7. That is, when the eccentric shaft 5 5 7 3 is eccentrically rotated, the end shaft 5 6 2 3 is brought into contact with the eccentric shaft 5 5 7 3. The piston 62 in contact with the piston 6 reciprocates in the axial direction of the cylinder 61.

[0 0 3 8]

The portion of the piston 6 2 protruding from the cylinder 6 1 is a guide member 6 provided on the inner peripheral surface of the storage chamber 5 3.

8 is slidably guided. In addition, an annular seal member 69 is provided in the storage chamber 53, and a guide member 6 \ ¥ 0 2019/207385? € 1/162019/052800

Installed adjacent to 8. By this seal rod 5 material 69, the outflow from the outer peripheral surface of the piston 62 is liquid-tightly sealed.

[0 0 3 9]

The piston 62 is formed with a bottomed hole 6 2 開口 opened in the axial direction on the pump chamber 63 side of the cylinder 61. Piston 6 2 (this is a suction hole 6 2 0, which is a through hole that communicates the outer peripheral surface with the bottomed hole 6 2 匕. Piston 6 2 (this is a bottomed hole 6 2 A suction valve (not shown) is provided to freely open and close the opening of 13. The suction valve includes a ball valve that closes the opening of the bottomed hole 62, and the ball valve. And a panel that urges the cylinder 6 from the cylinder 1 side, and the end 6 of the cylinder 6 1 on the piston 6 2 side covers the opening of the piston 6 2 inlet 6 2 0. A cylindrical filter 70 is attached.

[0 0 4 0]

A through hole 6 1 that communicates between the pump chamber 6 3 and the outside of the cylinder 6 1 is formed at the bottom of the cylinder 6 1. Is formed. A discharge valve 64 is provided on the side of the opening opposite to the pump chamber 63 in the through hole 61. The discharge valve 6 4 includes a ball valve 6 4 3 and a valve seat 6 4 [3, which is formed on the periphery of the opening end of the through hole 61 10 and on which the ball valve 6 4 3 can be separated. -A panel 6 4 0 that urges the valve 6 4 3 to seat in the valve seat 6 4 匕. The discharge valve 64 is disposed between the cylinder 61 and the copper 65.

[0 0 4 1]

Specifically, the copper 65 is attached to the bottom rod 5 61 of the cylinder 61 by, for example, press fitting. This copper 6 5 (this is formed with a bottomed hole 6 5 3 having an opening at a position opposite to the through hole 6 1 0 of the bottom 6 1 13 and the panel of the discharge valve 6 4 6 4 0 Is accommodated in the bottomed hole 65. Also, the inner diameter of the bottomed hole 65.sub.53 is larger than the outer diameter of the ball valve 6.sub.43. When the valve 6 4 3 is separated from the valve seat 6 4 匕, the ball valve 6 4 3 moves into the bottomed hole 6 5 3, that is, in the pump chamber 6 3 of the cylinder 6 1. When the brake fluid pressure increases and the force that pushes the ball valve 6 4 3 becomes greater than the biasing force of the panel 6 4 0, the ball valve 6 4 3 Is separated from the valve seat 6 4 、, and the pump chamber 6 3 communicates with the bottomed hole 6 5 3 of the cap 65 5 through the piercing 6 1, and the pump chamber 6 3 The brake fluid will flow into the bottomed hole 6 5 3. The discharge port 6 5 As a coffin, the outside of the copper 6 5 communicates with the bottomed hole 6 5 3 ¥ 0 2019/207385 € 1/162019/052800 Grooves are formed. The brake fluid that has flowed into the bottomed hole 6 5 3 of the cap 65 is discharged from the discharge port 6 5 カ.

It is discharged to the outside 5 of 6 5, that is, outside the pump 60.

[0 0 4 2]

The pump 60 configured as described above is accommodated in the accommodating chamber 53 formed in the base 51 as described above. Specifically, in the state where the annular projecting portion 6 1 3 formed on the outer peripheral portion of the cylinder 61 is in contact with the stepped portion 5 3 3 of the storage chamber 53, the periphery of the opening of the storage chamber 53 is By being caulked, the pump 60 is fixed in the housing chamber 53 of the base body 51.

[0 0 4 3]

When the pump 60 is housed in the housing chamber 53 as described above, a space communicating with the discharge port 65 of the pump 60 between the outer peripheral surface of the pump 60 and the inner peripheral surface of the housing chamber 53. A discharge chamber 54 is formed. That is, the discharge chamber 54 is a space formed in an annular shape on the outer peripheral side of the pump 60 so as to communicate with the discharge port 65 of the pump 60. As will be described later, the discharge chamber 54 constitutes a part 5 of the first discharge flow path 1403.

[0 0 4 4]

In the pump 60, the space between the annular projecting portion 6 13 3 of the cylinder 61 and the cap 65 is divided into two spaces by the partition portion 71. A space on the side of the copper 65 relative to the partition wall 5 71 is a discharge chamber 5 4. Further, the space closer to the protruding portion 6 13 than the partition portion 71 is an annular flow channel 55. As shown in FIG. 3, in the present embodiment, a partition 咅 5 7 is formed by a projecting portion projecting annularly on the outer peripheral surface of the cylinder 61 and a 0-ring provided on the projecting 咅 5. Make up one. However, the configuration of the partition portion 71 is arbitrary as long as the space between the annular protruding portion 61 3 of the cylinder 61 and the cap 65 can be partitioned into two spaces. For example, the partition portion 71 may be configured only by a protruding portion that protrudes in an annular shape on the outer peripheral surface of the cylinder 61. Further, for example, the partition portion 71 may be configured by only the 0 ring provided on the outer peripheral surface of the cylinder 61.

[0 0 4 5]

In the present embodiment, when the pump 60 is accommodated in the accommodating chamber 53, the suction port of the pump 60 is interposed between the outer peripheral surface of the pump 60 and the inner peripheral surface of the accommodating chamber 53. 6 2 An annular flow path 5 6 is formed which is a space communicating with 0. That is, the annular channel 56 is the suction port 6 2 of the pump 60. So that it can communicate with the pump 60 ¥ 0 2019/207385? € 1/162019/052800 An annular space. The annular channel 5 6 includes an annular projecting rod 5 6 1 3 of the cylinder 61 and a seal member 6

Formed between 9. In other words, the annular channel 56 is the suction port 62. It is formed on the outer peripheral side of the filter 70 provided so as to cover the opening 5.

[0 0 4 6]

The annular channel 56 is communicated with the intermediate channel 5 1 4 3 in the sub-channel 14 in FIG. 1 by an internal channel (not shown) formed in the base 51. In other words, the annular channel 56 constitutes one fifth 5 of the four channels 14. When the pump 60 is accommodated in the accommodating chamber 53, the suction port 6 2 of the pump 60. And middle part 1 4 3 need to communicate. By having the annular flow path 56, when the pump 60 is accommodated in the accommodation chamber 53, the suction inlet 62 of the pump 60. Alignment for communicating with the middle part 1 4 3 is not necessary. For this reason, the assembly of the hydraulic control unit 50 is facilitated by having the annular flow path 56. In addition, since the annular flow path 56 is provided, when the accommodation chamber 53 is subjected to the calorie on the base body 51, the first 5 of the first flow path 14 is also subjected to the caloe. Therefore, the production cost of the base 51 can be reduced, that is, the production cost of the hydraulic unit I can be reduced. In addition, since each of the annular flows 56 has a space on the outer peripheral side of the pump 60 as the secondary flow path 14, it is possible to reduce the size of the base body 51, that is, the hydraulic pressure control unit 50. it can.

[0 0 4 7]

As described above, the discharge chamber 54 formed on the outer peripheral surface side of the pump 60 is connected to the first discharge flow path 1403 constituting a part of the discharge flow path 140. The storage chamber 58 is a storage chamber for storing the damper unit 80 and is a bottomed hole formed in the outer wall of the base 51. The brake fluid in the discharge chamber 5 4 formed on the outer peripheral surface side of the pump 60 flows into the storage chamber 5 8 through the first discharge flow path 1403 and is stored in the storage chamber 58. The pulsation is attenuated by the damper unit 80. Then, the brake fluid whose pulsation has been attenuated flows into the second discharge flow path 140 through the check valve 84 provided in the damper unit 80. The second discharge flow path 1 40 連 communicates with the intermediate ridge 5 1 3 の of the main flow path 13 in FIG. 1 by an internal flow path (not shown) formed in the base 51.

[0 0 4 8]

The damper unit 80 accommodated in the storage chamber 58 is caulked around the opening of the storage chamber 58 by the cap portion 82. \\ 0 2019/207385 卩 (: 17132019/052800) is fixed to the base 51. This damper unit 80 is composed of a storage chamber 5 8 and a cap 咅 5 8 2. Attenuation chamber 8 1 And a pulsation absorbing member 83 and a check valve 84.

[0 0 4 9]

The storage chamber 58 has a bottomed cylindrical shape with one end opened and the other end stepped. A pulsation absorbing member 83 formed of a plurality of elastomer layers having different impact resilience is housed in the housing chamber 58. The pulsation absorbing member 83 is held by a holding portion 8 2 3 provided in the cap portion 82 2, and is held in the cap portion 82 2 by caulking or the like in the opening 5 of the storage chamber 58. Installed. Further, the vibration absorbing rod 5 material 83 is composed of four layers of elastomer layers in FIG. For example, of the four layers, the innermost layer (capacitor 82 side) of the elastomer layer is formed of silicon, and the second elastomer layer disposed above it is an ethylene layer. (巳 0 1 \ / 1), the third elastomer layer of the outer piece] is silicon, and the fourth elastomer layer of the outer piece] is from ethylene propylene Gen rubber (巳 0 1 \ / 1) It is formed. Thus, when the three elastomer layers arranged above are viewed, the silicon layer having a relatively high rebound resilience is disposed between the 0 layers having a low rebound resilience, and the blur that has flowed into the damping chamber. It becomes possible to effectively attenuate the pulsation of the liquid.

[0 0 5 0]

Further, a check valve 8 4 that restricts the flow of brake fluid from the outflow opening 8 1 0 of the damper unit 80 to the attenuation chamber 8 1 is located at a position facing the pulsation absorbing member in the attenuation chamber 8 1. Is provided. The check valve 8 4 includes a valve seat 8 4 3 that is locked to a stepped portion of the storage chamber 5 8, and a valve body 8 4 13 that cooperates with the valve seat 8 4 3 to regulate the flow of brake fluid. The spring 8 4 urges the valve body 8 4 へ in the direction of the valve seat 8 4 匕. And a cushion 8 5 8 4 ¢ 1 that guides the movement of the valve 8 4 、 and functions as a cushioning 咅 5 material for the valve 8 匕. When the hydraulic pressure of the brake fluid in the damping chamber 8 1 exceeds the specified pressure, the valve body 8 4 13 is lifted from the valve seat 8 1 3 and piled up against the urging force of the spring 8 40 Valve 8 4 opens. After that, the brake fluid in the damping chamber 81 with pressure flows into the second discharge flow path through the outflow opening 8 10. On the other hand, when the pressure in the damping chamber decreases and the brake fluid tries to flow backward from the outflow opening 8 10, the valve body 8 4 押圧 is pressed against the valve seat 8 4 3 by the urging force of the spring 8 40, and the valve seat

8 4 3 Close the opening provided in 3. Thereby, the backflow of brake fluid can be prevented.

[0 0 5 1] ¥ 0 2019/207385? € 1/162019/052800 As shown in Fig. 2, when the pump 60 and damper unit 80 are mounted on the base 51, when the pump 60 is driven, Brake fluid flows into

When the drive shaft 5 7 is rotated by a drive source (not shown) and the eccentric portion 5 7 3 formed on the drive shaft 5 7 moves toward the piston 62, the piston 62 is attached to the panel 67. It is pushed toward the cylinder 61 against the force. For this reason, the pressure in the pump chamber 6 3 is increased, the ball valve 6 4 3 is separated from the valve seat 6 4 匕, and the discharge valve 6 4 is opened. As a result, the brake fluid in the pump chamber 63 is passed through the through hole 61. And, through the bottomed hole 65 3 of the cap 65, it is discharged from the discharge outlet 65 to the discharge chamber 54.

[0 0 5 2]

When the drive shaft 5 7 further rotates and the eccentric portion 5 7 3 formed on the drive shaft 5 7 starts to rotate away from the piston 62, the piston 62 is moved by the biasing force of the panel 6 7. Move away from cylinder 61. For this reason, the pressure in the pump chamber 6 3 is lowered, the ball valve 6 4 3 is seated on the valve seat 6 4 して, the discharge valve 6 4 is closed, and the bottomed hole 6 2 開口 of the piston 6 2 is opened. A suction valve (not shown) that opens and closes the part is opened. As a result, the brake fluid in the annular channel 56 is filtered by the filter 70 and the suction port 6 2. And it flows into the pump chamber 6 3 through the bottomed hole 6 2 匕.

[0 0 5 3]

When the drive shaft 5 7 further rotates and the eccentric portion 5 7 3 formed on the drive shaft 5 7 approaches the piston 62 again, the piston 62 is pressed toward the cylinder 61 as described above. The brake fluid in the pump chamber 63 is discharged from the discharge port 65 to the discharge chamber 54. In this manner, the piston 62 repeatedly moves back and forth in the axial direction of the cylinder 61, and the suction valve and the discharge valve 64, not shown, are selectively opened and closed, so that the hydraulic pressure increases, that is, the pressure increases. The brake fluid is discharged from the discharge port 6 5 匕 to the discharge chamber 5 4. For this reason, the brake fluid pressurized by the pump 60 (this generates pulsation).

[0 0 5 4]

The brake fluid flowing into the storage chamber 58 passes through the inflow opening 8 1 8 of the damper unit 80 and flows into the damping chamber 81 of the damper unit 80. The brake fluid with pulsation absorbs the brake fluid pressure by the contraction action of the pulsation absorbing member, so that the pulsation of the brake fluid can be converged. Generally, elastomers with low resilience are high. ¥ 0 2019/207385? € 1/162019/052800 Compared to elastomers with rebound resilience, the transmission rate at the resonance point is low, but the transmission rate in the high frequency range is lower than that. The way of falling becomes moderate. On the other hand, elastomers with high rebound resilience have a transmission characteristic that transmission at the resonance point is high, but after that, the transmission rate decreases rapidly as the frequency increases. Therefore, elastomers with low rebound resilience are often used as vibration damping materials, and elastomers with high rebound resilience are often used as vibration damping materials. Particularly, in the pulsation absorbing member according to the present invention, an elastomer having high rebound resilience is placed between elastomer layers having low rebound resilience, and by combining the respective characteristics, an inherent pulsation frequency of the brake hydraulic unit is obtained. It is possible to provide a pulsation absorbing member that can cope with the above.

[0 0 5 5]

When the brake fluid pressure in the damping chamber 8 1 exceeds the specified pressure, the check valve 84 of the damper unit 80 opens. As a result, the brake fluid in which the pulsation in the damping chamber 8 1 is damped flows out from the outflow opening 8 1 0 to the second discharge flow path 1 4 0 、 and flows into the middle part 1 3 13 of the main flow path 1 3. I will do it.

[0 0 5 6]

FIG. 33 and FIG. 3 [3] are views showing another example of the pulsation absorbing member according to the damper unit of the present invention. Since the check valve 84 and the storage chamber 58 are the same as the damper unit 80 shown in FIG. 2, the following description will mainly focus on differences from the damper unit 80 shown in FIG. To do.

Like the damper unit 80 shown in FIG. 2, the damper unit 80 shown in FIG. 33 accommodates a pulsation absorbing member 83 formed of a plurality of elastomer layers having different rebound resilience. The pulsation absorbing member 8 3 is held by a conical projection 咅 5 8 2 立 standing substantially at the center of the cover 咅 5 82. In this way, if the pulsation absorbing member 8 38 is held by the conical protruding portion 8 2, it is easy to provide a through ridge through which the protruding ridge 5 penetrates each elastomer layer in advance. The elastomer layer can be attached to the copper bottle 5 8 2. Further, the pulsation absorbing member 8 3 may have the same configuration as the pulsation absorbing member 83 of FIG.

[0 0 5 7]

Fig. 3 Damper unit 8 0 巳 shown in 匕 is different from other damper units 80 in that the pulsation absorbing member 8 3 形成 formed by four elastomer layers with three different resilience is housed in the damping chamber. Has been.

Specifically, in the figure, the elastomer layer 8 3 巳 3 placed on the lower side (mostly on the copper side) is ethylene. ¥ 0 2019/207385? € 1/162019/052800 Elastomer layer formed by pyrene jen rubber (巳 0 1 \ / 1) and formed on it 8 0 巳匕 is repelled from 口 mouth 1 \ / 1 Elastomer layer 8 3 〇〇 formed from highly elastic fluororubber is formed from silicon with high rebound resilience from 1 1 \ / 1 and elastomer layer 8 0 巳¢ 1 is formed by ethylene, propylene, and jen rubber (opening 1 \ / 1).

Although not shown in FIG. 3, the pulsation absorbing member 8 3 よい may be secured to the cap 咅 5 8 2 by the protrusion 8 3 3 of FIG.

In addition, by making the elastomer layer 8 3 巳 3 placed in the lower part into a bowl-shaped 4 dog, the space formed by the inner surface of the elastomer layer 8 3 巳 3 and the attenuation chamber 8 1 is air damper. Can function as part 8-5. In this way, the inner wall of the damping chamber 8 1 is formed by forming two elastomer layers with relatively high rebound resilience inside and forming an elastomer layer with a relatively low rebound resilience disposed below in a bowl shape. Since the air damper portion 85 can be obtained between the two, the pulsation absorbing effect can be further improved.

[0 0 5 8]

The effects of the damper unit and the hydraulic control unit 50 according to the present embodiment will be described.

The damper unit has a multi-layered elastomer layer with different rebound resilience, and a configuration in which an elastomer layer with high rebound resilience is disposed between elastomer layers with low rebound resilience is unique to the brake hydraulic device. 5 pulsation absorbing rods can be obtained that match the pulsation frequency.

[0 0 5 9]

In addition, since the pulsation absorber is attached to the copper constituting the damping chamber, the damper unit can be easily assembled to the hydraulic control unit.

[0 0 6 0]

Since the damper unit is provided with an inflow opening through which the brake fluid flows into the peripheral surface of the damping chamber, the degree of freedom of mounting the damper unit to the hydraulic pressure control device can be improved.

[0 0 6 1]

The damper unit includes an air damper portion formed by an inner circumferential surface of the damping chamber and an elastomer layer, so that the brake unit ¥ 0 2019/207385? € 1/162019/052800 The pulsation effect of the liquid can be further improved.

[0 0 6 2]

Since the damper unit is connected to the discharge passage of the pump of the brake fluid pressure unit, the pulsation of the brake fluid generated from the discharge pressure by the pump can be effectively reduced.

[0 0 6 3]

Since the damper unit is connected to the supply flow path of the brake fluid pressure unit, it is possible to effectively reduce the pulsation of the brake fluid transmitted from the pump to the brake pedal.

[Explanation of symbols]

[0 0 6 4]

1 Brake system, 2 Hydraulic circuit, 2 3 Hydraulic circuit, 2 液 Hydraulic circuit, 1 1 Master cylinder, 1 2 Wheel cylinder, 1 3 Main flow path, 1 3 3, 1 3 途中 Midway, 1 4 Sub-flow path, 1 4 3 Middle section, 1 5 Supply flow path, 1 6 Brake pedal, 1 7 Booster, 1 8 Brake caliper, 1 9 Brake pad, 2 0 port-Even, 3 1 Retract valve , 3 2 Release valve, 3 3 Accumulation, evening, 3 5 1st switching valve, 3 6 2nd switching valve, 3 7 Damper unit, 5 0 Hydraulic control unit, 5 1 Base, 5 2 Controller, 5 3 Storage chamber, 5 3 3 steps, 5 4 Discharge chamber, 5 5 Annular flow path, 5 6 Annular flow path, 5 7 Drive shaft, 5 7 3 Eccentric part, 5 8 Storage chamber, 5 9 Storage chamber, 60 Pump , 6 1 Cylinder, 6 1 3 Protruding part, 6 1 匕 Bottom, 6 1 ○ Through hole, 6 2 Piston, 6 2 3 End, 6 2 匕 Bottomed hole, 6 2 〇 Suction port, 6 3 Pump chamber, 6 4 Discharge valve, 6 4 3 Ball valve, 6 4 匕 Valve seat, 6 4. Panel, 6 5 capa,

6 5 3 Bottomed hole, 6 5 匕 Discharge port, 6 6 Seal member, 6 7 Panel, 6 8 Guide member, 6 9 Seal member, 7 ○ Filter, 7 1 Partition, 8 0 Damper unit, 8 1 Damping chamber, 8 1 3 steps, 8 1 匕 Inflow opening, 8 1 〇 Outflow opening, 8 2 Cap portion, 8 2 3 Holding part, 8 2 突起 Protrusion, 8 3 Pulsation absorbing member, 8 4 Reverse Stop valve, 1 0 0 Vehicle, 1 4 0 Discharge flow path, 1 4 0 3 First discharge flow path

1 4 0 匕 Second discharge flow path

Claims

¥ 0 2019/207385? € 1/162019/052800 [Document Name] Claim

[Claim 1]

A damper unit having an attenuation chamber for attenuating pulsation of brake fluid and a pulsation absorbing member disposed in the attenuation chamber,

The pulsation absorbing member includes at least two elastomer layers having different rebound resilience, and the elastomer layer having the highest rebound resiliency among the three elastomer layers is disposed between the other elastomer layers. The

Damper unit.

[Claim 2]

The attenuation chamber is

A storage chamber formed in the base body of the hydraulic control unit of the brake system, and a cap portion that seals the opening of the storage chamber;

The cap portion includes a holding portion that holds the pulsation absorbing member.

The damper unit according to claim 1.

[Claim 3]

The damper unit is

A check valve for preventing the reverse flow of the brake liquid at a position facing the pulsation absorbing member in the attenuation chamber; and an inflow opening through which the brake liquid flows into a peripheral surface of the attenuation chamber.

The damper unit according to claim 1.

[Claim 4]

The damper unit is

The damper unit according to claim 1, further comprising an air damper portion formed by an inner peripheral surface of the attenuation chamber and at least one of the elastomer layers.

[Claim 5]

A main flow path for communicating the master cylinder and the wheel cylinder; ¥ 0 2019/207385 € 1/162019/052800 Branched from the main channel and connected to the pump suction side, and branched from the main channel and connected to the pump discharge side A sub-flow path having a discharge flow path;

A hydraulic control unit comprising:

A hydraulic pressure control unit, wherein the damper unit according to any one of claims 1 to 3 is connected to the discharge passage.

[Claim 6]

A main flow path for communicating the master cylinder and the wheel cylinder;

A suction flow path branched from the main flow path and connected to the suction side of the pump; a sub flow path having a discharge flow path branched from the main flow path and connected to the discharge side of the pump;

A hydraulic pressure control unit including a supply flow path branched from the main flow path and connected to the master cylinder and the suction flow path;

A hydraulic pressure control unit, wherein the damper unit according to any one of claims 1 to 3 is connected to the supply flow path.