CN218400508U - Brake master cylinder, automobile brake system and automobile - Google Patents

Abstract

The utility model provides a brake master cylinder, an automobile brake system and an automobile, wherein a master cylinder body of the brake master cylinder is provided with a fluid infusion channel, one end of the fluid infusion channel is communicated with a fluid infusion hole, the other end is communicated with a brake cavity, and a check valve component is arranged in the fluid infusion channel; when the pressure of the brake fluid in the brake cavity is not lower than a preset pressure threshold value, the one-way valve assembly receives the pressure applied by the brake fluid in the brake cavity and can close the fluid supplementing channel; when the pressure of the brake fluid in the brake cavity is lower than a preset pressure threshold value, the one-way valve assembly can open the fluid supplementing channel, so that the fluid supplementing hole is communicated with the brake cavity. The utility model discloses a brake master cylinder through fluid infusion passageway and interior check valve subassembly's setting, can be when needs fluid infusion for the vacuum of brake intracavity descends fast, and the brake fluid velocity of flow that can avoid supplementing is great, and striking cylinder body inner wall produces striking abnormal sound, and can promote automobile driving's travelling comfort.

Description

Brake master cylinder, automobile brake system and automobile

Technical Field

The utility model relates to an automobile brake system spare part technical field, in particular to brake master cylinder. The utility model discloses also relate to the car braking system who is equipped with this brake master cylinder to and have this car braking system's car.

Background

The brake master cylinder is one of important components in an automobile brake system, belongs to a one-way acting plunger type hydraulic cylinder, and is used for converting mechanical energy input by a pedal mechanism into hydraulic energy so as to realize the braking process of an automobile. The current brake master cylinder mainly includes a master cylinder body, a master cylinder piston, a seal ring, a master cylinder spring, and the like, and when the master cylinder piston is driven to slide, the master cylinder generates pressure and transmits the pressure to a brake system pipeline and an ESP (Electronic Stability Program), and the pressure finally acts on a brake to realize braking.

When the automobile is in a slope working condition and a brake pedal is stepped, brake fluid discharged by a brake master cylinder flows through an ESP and then is transmitted to a brake caliper of a brake for pressure build-up braking. In order to ensure that the automobile stops on a slope after the brake pedal of the automobile with the automatic parking function is released, the ESP throttles a part of brake fluid to act on the brake cylinder to generate pressure to ensure that the automobile does not slide down the slope, so that only a part of the brake fluid flows back into the brake cavity of the brake master cylinder, and at the moment, the brake cavity is changed into a vacuum state, and fluid needs to be replenished from the fluid storage tank.

When the brake fluid is replenished, the brake fluid in the fluid storage tank enters the brake main cylinder through the fluid replenishing hole on the main cylinder body and can jack the lip on the sealing ring to flow into the brake cavity. If the brake pedal is loosened quickly, the retraction speed of the piston of the main cylinder is increased, then the vacuum state can be formed in the brake cavity quickly, the vacuum degree is large, the brake fluid in the liquid storage tank pushes open the sealing ring and then enters the brake cavity quickly, and the liquid flow with large flow velocity collides the inner wall of the cylinder body of the main cylinder to generate impact abnormal sound, so that the comfort of automobile driving is affected.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a brake master cylinder to striking abnormal sound when can avoiding appearing the brake fluid replacement does benefit to and promotes driving comfort.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a brake master cylinder is characterized in that a master cylinder body of the brake master cylinder is internally provided with a liquid supplementing channel, one end of the liquid supplementing channel is communicated with a liquid supplementing hole, the other end of the liquid supplementing channel is communicated with a brake cavity, and a check valve assembly is arranged in the liquid supplementing channel;

when the pressure of the brake fluid in the brake cavity is not lower than a preset pressure threshold value, the one-way valve assembly bears the pressure applied by the brake fluid in the brake cavity and can close the fluid supplementing channel;

when the pressure of the brake fluid in the brake cavity is lower than the preset pressure threshold value, the one-way valve assembly can open the fluid infusion channel, so that the fluid infusion hole is communicated with the brake cavity.

Furthermore, the fluid infusion channel comprises a first channel and a second channel which are arranged in series, the first channel is communicated with the fluid infusion hole, the second channel is communicated with the brake cavity, and the inner diameter of the first channel is smaller than that of the second channel.

Further, the check valve assembly includes a fixed member disposed in the first passage, a blocking member disposed in the second passage, and an elastic member connected between the fixed member and the blocking member;

when the pressure of the brake fluid in the brake cavity is not lower than a preset pressure threshold value, under the pressure exerted by the brake fluid in the brake cavity, the blocking piece can compress the elastic piece, block one end of the first channel and close the fluid supplementing channel;

when the pressure of the brake fluid in the brake cavity is lower than the preset pressure threshold value, the blocking piece can remove the blocking of one end of the first channel under the elastic resetting force applied by the elastic piece, and the fluid supplementing channel is opened.

Further, the fixing member is of an annular structure, and a central hole through which brake fluid flows is formed in the fixing member.

Furthermore, the elastic part adopts a spring, one end of the spring is connected to the fixing part, and the other end of the spring is connected to the blocking part.

Further, the plugging piece is spherical.

Further, the cross section of the first channel and the cross section of the second channel are both circular, and the axes of the first channel and the second channel are arranged in a collinear way.

Compared with the prior art, the utility model discloses following advantage has:

brake master cylinder, through fluid infusion passageway and the setting of check valve subassembly in it, when needs fluid infusion, the fluid infusion passageway can be opened to check valve subassembly for the vacuum in the brake chamber descends fast, and then the velocity of flow of the supplementary brake fluid of greatly reduced, alright avoid the supplementary brake fluid velocity of flow great from this, striking cylinder body inner wall produces the striking abnormal sound, and can promote driver's travelling comfort.

Furthermore, the utility model discloses in make fluid infusion passageway constitute by first passageway and second passageway to and make check valve subassembly constitute by mounting and the shutoff piece that the elastic component links to each other, it can make fluid infusion passageway and check valve subassembly's structure all comparatively simple, and can be convenient for fluid infusion passageway and check valve subassembly's design and processing.

Additionally, the utility model discloses in, the mounting is loop configuration to supply brake fluid to flow through the centre bore above that, not only can simplify the structure of mounting, also easily satisfy the requirement to brake fluid circulation cross-section, guarantee the fluid infusion effect of brake fluid. The elastic part adopts a spring, has simple structure and reliable connection and is beneficial to the arrangement in the fluid infusion channel. And the plugging piece is spherical, which can help to ensure the plugging effect of the fluid infusion channel. The cross section of the first channel and the cross section of the second channel are circular, and the axes of the first channel and the second channel are collinear, so that the processing of the fluid infusion channel can be facilitated.

Another object of the present invention is to provide an automobile brake system, wherein the brake master cylinder is disposed in the automobile brake system.

And simultaneously, the utility model discloses also provide an automobile, be equipped with above-mentioned car braking system in the automobile.

Automobile braking system and car, through setting up above-mentioned brake master cylinder, when can avoiding the brake master cylinder internal braking chamber fluid infusion, because the brake fluid striking cylinder body inner wall of replenishment produces the striking abnormal sound, and can promote automobile driving's travelling comfort.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of a brake master cylinder according to an embodiment of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 2;

description of reference numerals:

1. a main cylinder body; 2. a master cylinder piston; 3. a brake chamber; 4. a fluid replenishing hole; 5. a communication channel; 6. a seal ring; 7. a fluid infusion channel; 8. a fixing member; 9. a blocking member; 10. an elastic member;

701. a first channel; 702. a second channel.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection may be fixed, detachable, or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in conjunction with the specific situation for a person of ordinary skill in the art.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to a brake master cylinder, which can avoid the impact abnormal sound generated when the supplemented brake fluid impacts the inner wall of a master cylinder body 1 when the fluid is supplemented into a brake cavity from a fluid storage tank, and is favorable for improving the driving comfort of an automobile.

In terms of overall structure, with reference to fig. 1 and fig. 2, the brake master cylinder of the present embodiment, which is similar to the structure of the existing brake master cylinder, mainly includes a master cylinder body 1, a master cylinder piston 2, a brake cavity 3, a fluid infusion hole 4, a sealing ring 6, and the like.

The two brake chambers 3 are separated by the master cylinder piston 2, and the master cylinder piston 2 is also provided with return springs respectively positioned in the brake chambers 3. The fluid replenishing holes 4 are two fluid replenishing holes arranged in one-to-one correspondence with the two brake chambers 3, and are provided with communication passages 5 in the master cylinder body 1 corresponding to the respective fluid replenishing holes 4. One end of each communication channel 5 is communicated with the bottom of the corresponding liquid supplementing hole 4, and the other end is communicated with a sealing ring 6 at one side of the communication channel so as to be communicated with the interior of the brake cavity 3 through the position of the sealing ring 6.

When the brake master cylinder works, the brake pedal is stepped on, the master cylinder piston 2 slides to squeeze brake fluid in the brake cavity 3, and the brake fluid is discharged from the brake master cylinder, flows through an ESP (electronic stability program) of an automobile and is transmitted to a brake caliper to build up brake. At this time, the brake fluid does not enter the communication passage 5 by the sealing action of the seal ring 6. When the brake pedal is released, the ESP throttles a part of brake fluid, the brake chamber 3 is turned into a vacuum state, and fluid needs to be replenished into the brake chamber 3 from the fluid reservoir. Under the vacuum suction in the brake cavity 3, the brake fluid in the liquid storage tank enters the communication channel 5 from the fluid infusion hole 4, and further jacks a lip on the sealing ring 6 to enter the brake cavity 3, so that the brake fluid infusion is realized.

In the above-described fluid supplying manner of the conventional brake master cylinder, if the brake pedal is released rapidly, the retraction speed of the master cylinder piston 2 is increased, and thus a vacuum state is rapidly formed in the brake chamber 3, and the vacuum degree is large. Brake fluid in the liquid storage tank backs up the lip on the sealing washer 6 and then can get into braking chamber 3 in rapidly, and the great liquid stream of velocity of flow striking main cylinder body 1 inner wall just can produce the striking abnormal sound, and then can influence the travelling comfort of auttombilism.

In view of the above problems in the master cylinder, the master cylinder of the present embodiment is designed such that a fluid replacement passage 7 is further provided in the master cylinder body 1, one end of the fluid replacement passage 7 communicates with the fluid replacement hole 4, the other end communicates with the brake chamber 3, and a check valve assembly is provided in the fluid replacement passage 7.

The check valve assembly is also configured to receive the pressure applied by the brake fluid in the brake chamber 3 when the pressure of the brake fluid in the brake chamber 3 is not lower than a preset pressure threshold value, and can close the fluid replenishing channel 7. When the pressure of the brake fluid in the brake cavity 3 is lower than a preset pressure threshold, the one-way valve assembly can open the fluid supplementing channel 7 so as to enable the fluid supplementing hole 4 to be communicated with the brake cavity 3.

Therefore, when the brake pedal is stepped on, the master cylinder piston 2 slides to squeeze brake fluid in the brake cavity 3, and the check valve assembly closes the fluid supplementing channel 7, so that the same effect as that of the sealing ring 6, namely, the brake fluid is prevented from entering the fluid supplementing hole 4. When the brake pedal is released, the master cylinder piston 2 retracts, the pressure in the brake cavity 3 decreases until vacuum is generated in the brake cavity 3, and the one-way valve assembly can open the fluid infusion channel 7, so that the fluid infusion hole 4 is communicated with the brake cavity 3, and brake fluid can be supplemented into the brake cavity 3 together with the communication channel 5.

Moreover, when the liquid supplementing channel 7 is opened by the check valve assembly, the vacuum degree in the brake cavity 3 can be rapidly reduced, so that the flow speed of supplemented brake liquid can be greatly reduced, the situation that the supplemented brake liquid has a large flow speed and impacts the inner wall of the main cylinder body 1 to generate impact abnormal sound can be avoided, and the comfort of automobile driving can be improved.

In this embodiment, as a possible implementation form, as shown in fig. 3, the fluid infusion channel 7 specifically includes a first channel 701 and a second channel 702 which are arranged in series, the first channel 701 is communicated with the fluid infusion hole 4, the second channel 702 is communicated with the brake cavity 3, and an inner diameter of the first channel 701 is also set to be smaller than an inner diameter of the second channel 702. Meanwhile, the above-mentioned check valve assembly also specifically includes a fixed member 8 disposed in the first passage 701, a blocking member 9 disposed in the second passage 702, and an elastic member 10 connected between the fixed member 8 and the blocking member 9.

At this time, when the brake pedal is depressed so that the pressure of the brake fluid in the brake chamber 3 is not lower than the preset pressure threshold, the blocking member 9 can compress the elastic member 10 under the pressure applied by the brake fluid in the brake chamber 3, and block one end of the first passage 701, thereby closing the fluid replenishing passage 7. When the brake pedal is released, so that the pressure of the brake fluid in the brake cavity 3 is lower than a preset pressure threshold value, the compressed elastic element 10 is reset, and under the elastic reset force applied by the elastic element 10, the blocking element 9 can release the blocking of one end of the first channel 701, so that the fluid supplementing channel 7 is opened.

It should be noted that the above-mentioned "preset pressure threshold" is the pressure at which the blocking piece 9 compresses the elastic piece 10 and the blocking piece 9 is just capable of blocking one end of the first channel 701, and the pressure is related to the property of the elastic piece 10. In specific implementation, the elastic member 10 may be selected according to the overall design requirement of the master cylinder, and thus the "preset pressure threshold" is also determined.

In addition, it can be understood that, by making the fluid infusion channel 7 consist of the first channel 701 and the second channel 702, and making the check valve assembly consist of the fixing member 8 and the blocking member 9 connected by the elastic member 10, the structures of the fluid infusion channel 7 and the check valve assembly can be simplified, and the design and the processing of the fluid infusion channel 7 and the check valve assembly are facilitated.

In practical implementation, as a preferred embodiment, the fixing member 8 of the present embodiment may be provided in a ring-shaped structure, and thus a center hole through which brake fluid flows is formed in the fixing member 8, as in a common ring-shaped or tubular structure. Thus, the fixing member 8 is configured to be an annular structure, and the brake fluid flows through the central hole on the fixing member 8, so that the structure of the fixing member 8 can be simplified, the requirement on the flowing section of the brake fluid can be easily met, and the fluid supplementing effect of the brake fluid can be ensured.

In this embodiment, the fixing member 8 may be fixed in the first passage 701 by interference press-fitting or screwing. The resilient member 10 of this embodiment is preferably a spring of conventional construction and is attached at one end to the fixed member 8 and at the other end to the blocking member 9. The spring has the characteristics of simple structure and reliable connection, and is also favorable for arranging the elastic element 10 in the fluid infusion channel 7.

Also as a preferred implementation form, the blocking member 9 of the present embodiment may be provided with a spherical shape, the diameter of which is smaller than the inner diameter of the second channel 702 and larger than the inner diameter of the first channel 701, and in a specific implementation, the blocking member 9 may be, for example, a steel ball. At this time, the plugging piece 9 is set to be spherical, which helps to ensure the plugging effect of the fluid infusion channel 7. However, instead of a spherical shape, it is of course also possible to use a conical configuration for the blocking element 9, with the small end of the conical blocking element 9 being connected to the resilient element 10 and with one end of the first passage 701 being blocked by the conical outer wall of the blocking element 9.

In the present embodiment, preferably, referring also to fig. 2 and 3, the cross-sections of the first passage 701 and the second passage 702 constituting the fluid infusion passage 7 are also each provided in a circular shape, and also the axes of the first passage 701 and the second passage 702 are provided in a collinear manner. At this time, the cross sections of the first passage 701 and the second passage 702 are circular, and the axes of the first passage and the second passage are collinear, so that the fluid infusion passage 7 can be conveniently machined in the master cylinder body 1, and the machining cost can be reduced.

Of course, rather than providing the first and second channels 701, 702 in an axially collinear arrangement, the two may also be provided in other arrangements. Meanwhile, in addition to making the fluid infusion channel 7 consist of the first channel 701 and the second channel 702 which are connected in series, the fluid infusion channel 7 may also be designed into other channel structures which can communicate the fluid infusion hole 4 with the brake cavity 3 in the embodiment, and based on the specific structural form adopted by the fluid infusion channel 7, the check valve assembly may also adopt check valve products with other structural forms. As long as it can satisfy the on-off control requirement of the embodiment for the fluid infusion channel 7.

According to the brake master cylinder of the embodiment, through the arrangement of the fluid infusion channel 7 and the check valve assembly therein, when fluid infusion is needed, the check valve assembly opens the fluid infusion channel 7, so that the vacuum degree in the brake cavity 3 is rapidly reduced, and the flow rate of supplemented brake fluid is greatly reduced. Therefore, the brake fluid flow velocity can be prevented from being supplemented to be large, impact abnormal sound is generated by impacting the inner wall of the main cylinder body 1, the comfort of automobile driving can be improved, and the practicability is good.

In addition, the embodiment also relates to an automobile brake system, and the automobile brake system is provided with the brake master cylinder.

Furthermore, the embodiment also relates to an automobile, and the automobile brake system is arranged in the automobile.

The automobile brake system and the automobile of the embodiment can avoid the phenomenon that when the brake cavity in the brake master cylinder is replenished with liquid, because the replenished brake liquid impacts the inner wall of the cylinder body 1 of the master cylinder to generate impact abnormal sound, the comfort of automobile driving can be improved, and the automobile brake system and the automobile have good practicability.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A brake master cylinder characterized by:

a fluid infusion channel (7) is arranged in a main cylinder body (1) of the brake main cylinder, one end of the fluid infusion channel (7) is communicated with the fluid infusion hole (4), the other end of the fluid infusion channel is communicated with the brake cavity (3), and a one-way valve assembly is arranged in the fluid infusion channel (7);

when the pressure of the brake fluid in the brake cavity (3) is not lower than a preset pressure threshold value, the one-way valve assembly bears the pressure applied by the brake fluid in the brake cavity (3) and can close the fluid supplementing channel (7);

when the pressure of the brake fluid in the brake cavity (3) is lower than the preset pressure threshold value, the one-way valve assembly can open the fluid infusion channel (7), so that the fluid infusion hole (4) is communicated with the brake cavity (3).

2. The master cylinder according to claim 1, wherein:

fluid infusion passageway (7) are including first passageway (701) and second passageway (702) that the series connection set up, first passageway (701) with fluid infusion hole (4) intercommunication, second passageway (702) with braking chamber (3) intercommunication, just the internal diameter of first passageway (701) is less than the internal diameter of second passageway (702).

3. The master cylinder of claim 2, wherein:

the one-way valve assembly comprises a fixed piece (8) arranged in the first channel (701), a blocking piece (9) arranged in the second channel (702), and an elastic piece (10) connected between the fixed piece (8) and the blocking piece (9);

when the pressure of the brake fluid in the brake cavity (3) is not lower than a preset pressure threshold value, under the pressure exerted by the brake fluid in the brake cavity (3), the blocking piece (9) can compress the elastic piece (10) and block one end of the first channel (701) so as to close the fluid supplementing channel (7);

when the pressure of the brake fluid in the brake cavity (3) is lower than the preset pressure threshold value, under the elastic reset force applied by the elastic piece (10), the blocking piece (9) can release the blocking of one end of the first channel (701), and the fluid supplementing channel (7) is opened.

4. The master cylinder of claim 3, wherein:

the fixing piece (8) is of an annular structure, and a central hole for brake fluid to flow through is formed in the fixing piece (8).

5. The master cylinder according to claim 3, wherein:

the elastic piece (10) is a spring, one end of the spring is connected to the fixing piece (8), and the other end of the spring is connected to the plugging piece (9).

6. The master cylinder of claim 3, wherein:

the plugging piece (9) is spherical.

7. The master cylinder according to any one of claims 2 to 6, wherein:

the cross sections of the first channel (701) and the second channel (702) are circular, and the axes of the first channel (701) and the second channel (702) are arranged in a line.

8. An automotive brake system, characterized in that:

a brake master cylinder according to any one of claims 1 to 7 is provided in the vehicle brake system.

9. An automobile, characterized in that:

the vehicle brake system of claim 8 is provided in the vehicle.

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