CN115009241A - Pressure control unit and braking system - Google Patents
Pressure control unit and braking system Download PDFInfo
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- CN115009241A CN115009241A CN202210771374.8A CN202210771374A CN115009241A CN 115009241 A CN115009241 A CN 115009241A CN 202210771374 A CN202210771374 A CN 202210771374A CN 115009241 A CN115009241 A CN 115009241A
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- gnawing
- flow passage
- control unit
- pressure control
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- 238000007789 sealing Methods 0.000 claims abstract description 94
- 230000035929 gnawing Effects 0.000 claims abstract description 40
- 230000002093 peripheral effect Effects 0.000 claims description 44
- 238000004891 communication Methods 0.000 claims description 16
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 1
- 230000002265 prevention Effects 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 description 21
- 230000000694 effects Effects 0.000 description 12
- 239000010985 leather Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 239000000306 component Substances 0.000 description 5
- 230000005489 elastic deformation Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011265 semifinished product Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
- B60T13/142—Systems with master cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
- B60T13/148—Arrangements for pressure supply
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention relates to the technical field of vehicle braking, and discloses a pressure control unit and a braking system.A position of a piston when at least one part of a middle flow passage and a shell flow passage is opposite to a first sealing element is recorded as a gnawing position, a gnawing prevention structure is additionally arranged, one of the gnawing prevention structure and the first sealing element is arranged on the piston, and the other one of the gnawing prevention structure and the first sealing element is arranged on a cylinder body, so that when the piston is positioned at the gnawing position, the gnawing prevention structure is abutted and acted on the first sealing element, and the first sealing element is prevented from entering the shell flow passage or the middle flow passage opposite to the first sealing element. And through injecing the concrete structure that prevents gnawing and eat the structure, when making the piston be in the intercommunication position, the casing runner is through preventing gnawing and eat structure and middle runner intercommunication, avoids gnawing and eat the setting of structure and cause the influence to pressure control unit's normal work.
Description
Technical Field
The invention relates to the technical field of vehicle braking, in particular to a pressure control unit and a braking system.
Background
The pressure control unit is one of the core components of the electromechanical liquid servo brake system and comprises a motor and a servo main cylinder, wherein the motor is structurally connected with a piston 2 'of the servo main cylinder through a transmission unit such as a nut screw rod, the motor drives the piston 2' to reciprocate in a cylinder body 1 'of the servo main cylinder through the transmission unit, and brake liquid in the cylinder body 1' enters and exits through an isolation valve to be pressurized or decompressed.
In order to prevent the brake fluid from leaking from the gap between the piston 2 'and the cylinder 1', a sealing member such as a cup or the like is generally provided between the piston 2 'and the cylinder 1'. As shown in fig. 1 and 2, one end of the cylinder 1 'is open, and one end of the piston 2' is inserted into the cylinder 1 'from the open end of the cylinder 1' and forms a pressure chamber 6 'with the cylinder 1'. The cylinder body 1 'is provided with a first oil duct 11' and a second oil duct 12 ', the second oil duct 12' is communicated with the pressure cavity 6 ', and the valve body 3' of the isolation valve is provided with a first oil port 31 'and a second oil port 32'; the valve body 3 'of the isolation valve is provided with a mounting hole, the open end of the cylinder body 1' is inserted into the mounting hole, so that the first oil duct 11 'is communicated with the first oil port 31', and the second oil duct 12 'is communicated with the second oil port 32'. The piston 2 ' is provided with an intermediate oil passage 21 ' communicated with the pressure chamber 6 ', and the piston 2 ' can slide in the cylinder 1 ' along the axial direction thereof, so that the intermediate oil passage 21 ' can be selectively communicated with or disconnected from the first oil passage 11 '.
When the piston 2 'is at a communication position where the middle oil passage 21' is communicated with the first oil passage 11 ', the first oil port 31', the first oil passage 11 ', the middle oil passage 21', the pressure chamber 6 ', the second oil passage 12' and the second oil port 32 'are sequentially communicated, so that the brake fluid in the pressure chamber 6' can be fed in and out; when the piston 2 ' is at the disconnection position where the intermediate oil passage 21 ' is disconnected from the first oil passage 11 ', the brake fluid in the pressure chamber 6 ' cannot enter or exit, and the pressure in the pressure chamber 6 ' is large.
The process of sliding the piston 2 'from the connection position to the disconnection position is a pressure building process, and in order to prevent the brake fluid in the pressure chamber 6' from leaking through a gap between the outer peripheral wall of the piston 2 'and the inner peripheral wall of the cylinder 1' after the pressure building process is finished, the pressure stabilizing effect is affected. Two seals are arranged between the outer peripheral wall of the piston 2 ' and the inner peripheral wall of the cylinder body 1 ', the first seal 4 ', the first oil channel 11 ', the second seal 5 ' and the second oil channel 12 ' are sequentially arranged at intervals along the direction from the open end of the cylinder body 1 ' to the inner bottom wall of the cylinder body 1 ', and the middle oil channel 21 ' is always positioned between the first seal 4 ' and the second oil channel 12 '. The first seal 4 'is provided to prevent brake fluid from leaking through a gap between the outer peripheral wall of the piston 2' near the open end of the cylinder 1 'and the inner peripheral wall of the cylinder 1'. When the piston 2 'is at the communication position, the intermediate oil passage 21' is communicated with the first oil passage 11 'and the intermediate oil passage 21' is positioned between the first seal 4 'and the second seal 5', so that the brake fluid in the first oil passage 11 'and the brake fluid in the pressure chamber 6' are prevented from flowing through a gap between the outer peripheral wall of the piston 2 'and the inner peripheral wall of the cylinder body 1' between the first oil passage 11 'and the second oil passage 12'; when the piston 2 'is at the disconnection position, the intermediate oil passage 21' is blocked by the inner peripheral wall of the cylinder 1 ', the first oil passage 11' is blocked by the outer peripheral wall of the piston 2 ', and the intermediate oil passage 21' is located between the second oil passage seal 5 'and the second oil passage 12', so that the brake fluid in the first oil passage 11 'and the brake fluid in the pressure chamber 6' are prevented from flowing into each other through a gap between the outer peripheral wall of the piston 2 'and the inner peripheral wall of the cylinder 1' between the first oil passage 11 'and the second oil passage 12'.
The two seals usually adopt a leather cup structure, and the leather cup structure has certain elastic deformation in the sealing process by adopting the leather cup structure. During the switching of the piston 2 'between the off position and the on position, there is a position of the piston 2' in which the second channel seal 5 'at least partially faces the intermediate oil channel 21'. When piston 2 'was in this position, the outward flange of leather cup structure probably lost the butt effect of piston 2' periphery wall, can resume elastic deformation under self effect, make the outward flange of partial leather cup structure get into in the middle oil duct 21 ', take place the phenomenon that the leather cup structure was gnawed promptly, when the leather cup structure takes place to be gnawed the phenomenon, lead to the fluid in the middle oil duct 21' to pass through the gap between the periphery wall of piston 2 'and the internal perisporium of cylinder 1' and scurry, thereby lead to the sealed effect of first sealing member can worsen.
Disclosure of Invention
The invention aims to provide a pressure control unit and a brake system, which can avoid the phenomenon that a leather cup structure is bitten and ensure the sealing effect between a piston and a shell.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pressure control unit comprising:
the brake component comprises a shell, wherein a shell runner is arranged on the shell and is used for connecting an oil supply channel of the brake component;
the piston is movably arranged in the shell along the axial direction of the piston and is provided with a pressure cavity, and the piston is provided with a middle flow passage communicated with the pressure cavity; the piston is provided with a communication position for communicating the intermediate flow passage with the shell flow passage and a disconnection position for disconnecting the intermediate flow passage from the shell flow passage;
a first seal sealingly disposed between the piston and the housing;
further comprising: the piston further comprises a gnawing position, and when the piston moves to the gnawing position, at least one part of the middle flow passage and the shell flow passage is opposite to the first sealing element; the gnawing position is the connection position, the disconnection position or a position between the connection position and the disconnection position;
the pressure control unit further includes:
an anti-gnawing structure located between the piston and the housing and having one of the anti-gnawing structures disposed on the piston and the other disposed on the housing, the anti-gnawing structure configured to: the middle flow passage can be communicated with the shell flow passage through the anti-gnawing structure when the piston is at a communication position; the piston can also abut against the first seal when in the gnawing position.
As an optional technical solution of the pressure control unit, the anti-gnawing structure is a porous structure.
As an optional technical solution of the pressure control unit, the anti-bite structure is a C-shaped ring.
As an optional technical solution of the above pressure control unit, the first sealing element is embedded in the housing, and the anti-biting structure is embedded in the piston and covers an outlet of the intermediate flow passage;
or the first sealing element is embedded in the piston, and the anti-biting structure is embedded in the shell and covers the outlet of the shell flow passage.
As an optional technical solution of the above pressure control unit, the anti-biting-and-biting structure includes an anti-biting-and-biting surface capable of abutting against the first sealing member, and the anti-biting-and-biting surface is flush with an inner peripheral wall of the housing or an outer peripheral wall of the piston where the anti-biting-and-biting structure is located.
As an optional technical solution of the above pressure control unit, the anti-gnawing structure is disposed on the piston, and the piston includes:
the annular groove is communicated with the middle flow passage, the annular groove is arranged on the outer peripheral wall of the piston, and the anti-bite structure is arranged in the annular groove;
an axial flow passage in communication with the pressure chamber;
and the radial flow passage is communicated with the annular groove and the axial flow passage.
As an optional technical solution of the above pressure control unit, at least two radial flow passages are provided, and at least two radial flow passages are provided at intervals along the circumferential direction of the piston;
the opening of the C-shaped ring is positioned between two adjacent radial flow passages.
As an optional technical solution of the above pressure control unit, a limiting member is disposed in the intermediate flow passage, and is configured to prevent the C-ring from rotating circumferentially relative to the piston.
As an optional solution of the above pressure control unit, a part of the C-ring is inserted into the radial flow passage to form the limiting member.
As an optional technical solution of the above pressure control unit, an annular seal groove is formed in an inner peripheral wall of the housing or an outer peripheral wall of the piston where the first seal is located, and the first seal is installed in the annular seal groove;
the inner bottom wall of the annular sealing groove is a preventive surface matched with the surface of the first sealing element in contact with the annular sealing groove in shape.
As an optional technical solution of the above pressure control unit, the first sealing element is of a leather cup structure.
As an alternative solution to the above pressure control unit, the housing includes:
the valve body is provided with a through hole which is arranged in a through mode, and the piston is movably arranged in the through hole;
the cylinder body is fixedly connected with the valve body;
the cylinder body with valve body integrated into one piece, or, the cylinder body with the valve body is connected fixedly.
The invention also provides a brake system which comprises the pressure control unit in any scheme.
The invention has the beneficial effects that: according to the pressure control unit and the brake system provided by the invention, the position of the piston when at least one part of the middle flow passage and the shell flow passage is opposite to the first sealing element is marked as the gnawing position, the anti-gnawing structure is additionally arranged, one of the anti-gnawing structure and the first sealing element is arranged on the piston, and the other one of the anti-gnawing structure and the first sealing element is arranged on the cylinder body, so that when the piston is positioned at the gnawing position, the anti-gnawing structure is abutted to the first sealing element, and the first sealing element is prevented from entering the shell flow passage or the middle flow passage opposite to the first sealing element. And through injecing the concrete structure that prevents gnawing and eat the structure, when making the piston be in the intercommunication position, the casing runner is through preventing gnawing and eat structure and middle runner intercommunication, avoids gnawing and eat the setting of structure and cause the influence to pressure control unit's normal work.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a pressure control unit provided by the prior art;
FIG. 2 is a cross-sectional view of the cylinder of FIG. 1;
FIG. 3 is a cross-sectional view of the pressure control unit with the piston in the connected position according to one embodiment of the present invention;
FIG. 4 is a partial cross-sectional view of the pressure control unit with the piston in the connected position according to one embodiment of the present invention;
fig. 5 is a sectional view of a piston provided with an anti-gnawing structure according to a first embodiment of the present invention;
FIG. 6 is a cross-sectional view of a housing provided in accordance with an embodiment of the present invention;
FIG. 7 is an enlarged partial schematic view at A of FIG. 6;
FIG. 8 is a flow chart illustrating a process for manufacturing a housing according to an embodiment of the present invention;
fig. 9 is a sectional view of a pressure control unit (the anti-biting structure is not shown) when the piston provided by the second embodiment of the present invention is in a communication position;
FIG. 10 is a cross-sectional view of a valve body provided in accordance with a second embodiment of the present invention;
fig. 11 is a schematic structural diagram of a cylinder provided in the second embodiment of the present invention.
In the figure:
1', a cylinder body; 11', a first oil passage; 12', a second oil channel; 2', a piston; 21', an intermediate oil passage; 3', a valve body; 31', a first oil port; 32' and a second oil port; 4', a first sealing; 5', and sealing the second channel; 6', a pressure chamber;
1. a housing; 11. a cylinder body; 111. an inner bottom wall; 112. riveting and flanging; 12. a valve body; 121. an annular seal groove; 1211. a waterproof surface; 122. perforating holes; 123. riveting the groove; 13. a housing flow passage; 14. a second access hole; 15. a pressure chamber; 2. a piston; 21. an intermediate flow passage; 211. an axial flow passage; 212. a radial flow passage; 3. a first seal member; 4. a second seal member; 5. a gnawing prevention structure; 100. a blank; 200. and (5) semi-finished product.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
As shown in fig. 3, the present embodiment provides a pressure control unit and a brake system, wherein the brake system includes the pressure control unit, and the pressure control unit builds pressure when the brake pedal is pressed. It should be noted that the pressure control unit provided in the present embodiment is not limited to be applied to a brake system.
Specifically, the pressure control unit includes a housing 1 and a piston 2, one end of the housing 1 is open, one end of the piston 2 is inserted into the housing 1 through the opening, and the piston 2 is movably disposed in the housing 1 and forms a pressure chamber 15 with the housing 1. The housing 1 is provided with a housing flow passage 13 and a second inlet/outlet hole 14 communicated with the pressure chamber 15, wherein the housing flow passage 13 is used for connecting an oil supply passage of a brake component, and the brake component refers to a component for providing braking force such as a conventional brake caliper. The piston 2 is provided with an intermediate flow passage 21, and the intermediate flow passage 21 can be selectively connected to or disconnected from the housing flow passage 13 in the process of moving the piston 2 in the housing 1.
The piston 2 can move back and forth along its axial direction between the on position and the off position in the housing 1, and as to how the piston 2 moves axially, it is a prior art in the field, such as a motor screw structure, and the like, and will not be described in detail here. When the piston 2 is in the communication position, the intermediate flow channel 21 at least partially faces the housing flow channel 13 and communicates with the housing flow channel 13, and brake fluid can enter and exit the pressure chamber 15 through the housing flow channel 13 and the intermediate flow channel 21. When the piston 2 is at the off position, the intermediate flow passage 21 is blocked by the inner peripheral wall of the housing 1, the housing flow passage 13 is blocked by the outer peripheral wall of the piston 2, the intermediate flow passage 21 and the housing flow passage 13 are disconnected, and the brake fluid cannot enter and exit the pressure chamber 15 through the intermediate flow passage 21 and the housing flow passage 13.
In order to ensure the sealing performance between the outer circumferential wall of the piston 2 and the inner circumferential wall of the housing 1, a first sealing member 3 and a second sealing member 4 are interposed between the outer circumferential wall of the piston 2 and the inner circumferential wall of the housing 1, and the first sealing member 3 and the second sealing member 4 are arranged at intervals in the axial direction of the piston 2. A second seal 4 is provided between the open end face of the opening of the housing 1 and the housing flow passage 13 in the axial direction of the piston 2, for preventing the brake fluid from leaking from a gap between the outer peripheral wall of the piston 2 between the open end face and the housing flow passage 13 and the inner peripheral wall of the housing 1. The first seal member 3 is located between the second inlet/outlet hole 14 and the housing flow path 13, and prevents the brake fluid in the housing flow path 13 and the brake fluid in the pressure chamber 15 from flowing into each other through a gap between the outer circumferential wall of the piston 2 and the inner circumferential wall of the housing 1 between the second inlet/outlet hole 14 and the housing flow path 13.
Illustratively, the first seal member 3 and the second seal member 4 are both fixedly mounted on the inner peripheral wall of the cylinder block 12, and the second seal member 4, the housing flow passage 13, the first seal member 3, and the second access hole 14 are arranged at intervals in sequence from the opening end surface of the housing 1 to the inner bottom wall 111 of the housing 1. In other embodiments, at least one of the first sealing member 3 and the second sealing member 4 may be fixedly mounted on the outer circumferential wall of the piston 2, for example, both the first sealing member 3 and the second sealing member 4 are fixedly mounted on the outer circumferential wall of the piston 2, or one of the first sealing member 3 and the second sealing member 4 is fixedly mounted on the outer circumferential wall of the piston 2, and the other is fixedly mounted on the inner circumferential wall of the cylinder 12.
Illustratively, the first seal member 3 and the second seal member 4 are both cup structures. In other embodiments, the first sealing element 3 and the second sealing element 4 may also be O-rings or the like.
When the piston 2 is in the communication position, the intermediate flow passage 21 is located between the first seal member 3 and the second seal member 4 in the axial direction of the piston 2; when the piston 2 is in the open position, the first seal 3 is located between the intermediate flow passage 21 and the second access hole 14 in the axial direction of the piston 2. It can be seen that when the piston 2 moves between the on position and the off position, the first seal 3 passes through the intermediate flow passage 21, that is, when the first seal 3 is fixed to the inner peripheral wall of the cylinder 12, the piston 2 has a position where the intermediate flow passage 21 at least partially faces the first seal 3 during the axial movement of the piston 2, and for convenience of description, this position is referred to as a gnawing position in this embodiment, but in other embodiments, when the first seal 3 is fixed to the outer peripheral wall of the piston 2, the piston 2 has a position where the housing flow passage 13 at least partially faces the first seal 3, and this position is a gnawing position.
The biting position will be described in detail with reference to the embodiment in which the first seal 3 is fixed to the inner peripheral wall of the cylinder 12. When the piston 2 is located at the biting position, because at least part of the first sealing element 3 is right opposite to the middle flow passage 21, the part of the first sealing element 3 right opposite to the middle flow passage 21 loses the abutting effect of the peripheral wall of the piston 2, the part of the first sealing element 3 can automatically reset, especially when the leather cup is selected for the first sealing element 3, the part of the outer edge of the first sealing element 3 can enter the middle flow passage 21, the phenomenon generated by the first sealing element 3 is called the biting phenomenon, and the position of the piston when the biting phenomenon is generated by the first sealing element 3 is recorded as the biting position.
It should be noted that the biting position may be located between the disconnecting position and the connecting position, the biting position may be located at the connecting position, and the biting position may also be located at the disconnecting position, specifically, determined by the axial distance between the first sealing member 3 and the second sealing member 4 and the axial length of the anti-biting structure 5, and the specific position of the biting position is not limited herein.
In this embodiment, when the piston 2 is located at the biting position, since the first sealing member 3 at least partially faces the intermediate flow channel 21, the portion of the first sealing member 3 facing the intermediate flow channel 21 loses the abutting effect of the outer peripheral wall of the piston 2, the outer edge portion of the first sealing member 3 may return to enter the intermediate flow channel 21, the oil in the intermediate flow channel 21 may enter between the outer peripheral wall of the piston 2 and the inner peripheral wall of the cylinder 1, and the first sealing member 3 loses or weakens the effect of preventing the brake fluid from flowing through the gap between the outer peripheral wall of the piston 2 and the inner peripheral wall of the housing 1 between the second inlet/outlet hole 14 and the housing flow channel 13.
As shown in fig. 3 to 5, in order to solve the above technical problem, the pressure control unit provided in this embodiment is additionally provided with an anti-gnawing structure 5, where the relationship between the anti-gnawing structure 5 and the connection position and the disconnection position depends on the gnawing position, and the anti-gnawing structure 5 is configured to: the middle flow passage 21 can be communicated with the shell flow passage 13 through the anti-biting structure 5 when the piston 2 is at the communication position; the first sealing element 3 can be abutted and acted on when the piston 2 is at the gnawing position, so that the first sealing element 3 is prevented from entering the housing flow passage 13 or the middle flow passage 21 opposite to the first sealing element.
In the present embodiment, when the first seal 3 is fixedly attached to the inner peripheral wall of the housing 1, the anti-biting structure 5 is fitted to the outer peripheral wall of the piston 2 and covers the outlet of the intermediate flow passage 21. In other embodiments, when the first sealing member 3 is fixedly mounted on the outer circumferential wall of the piston 2, the anti-biting structure 5 is embedded in the inner circumferential wall of the housing 1 and covers the outlet of the housing flow passage 13.
When the piston 2 is at the gnawing position, although the first sealing element 3 loses the abutting action of the peripheral wall of the piston 2, the anti-gnawing structure 5 positioned in the middle flow passage 21 abuts against the first sealing element 3, so that the phenomenon that the edge part of the first sealing element 3 enters the middle flow passage 21 and the first sealing element 3 is gnawed is prevented, and the sealing effect of the first sealing element 3 in the reciprocating process of the piston 2 is effectively ensured. In addition, because prevent gnawing and eat in structure 5 locates middle runner 21, in order to avoid piston 2 to be in when the intercommunication position prevent gnawing and eat structure 5 and cause the influence to the state of communication between casing runner 13 and middle runner 21, prescribe a limit to the concrete structure that prevents gnawing and eat structure 5, when making piston 2 be in the intercommunication position, casing runner 13 can be through preventing gnawing and eat structure 5 and middle runner 21 intercommunication, avoid preventing to gnawing and eat that the setting of structure 5 causes the influence to pressure control unit's normal work.
Alternatively, the anti-biting structure 5 is a porous structure, so that when the piston 2 is in the communication position, the housing flow passage 13 is communicated with the intermediate flow passage 21 through the anti-biting structure 5. Illustratively, the porous structure may be a mesh structure. As for the specific material selection of the porous structure, the porous structure is required to have certain rigidity, so that the structural strength of the porous structure is ensured, and the deformation of the porous structure when the first sealing element 3 acts on the porous structure is avoided. In addition, the gaps of the porous structure are limited to avoid a large pressure difference between the housing flow passage 13 and the intermediate flow passage 21 when the piston 2 is in the communication position due to the porous structure, and the specific gaps of the porous structure can be determined by repeated tests according to actual requirements.
In order to install the anti-biting structure 5 on the piston 2, the middle flow passage 21 comprises an annular groove, an axial flow passage 211 and a radial flow passage 212, wherein the annular groove is arranged on the outer peripheral wall of the piston 2, the axial flow passage 211 is arranged at one end of the piston 2 arranged in the shell 1 and extends along the axial direction of the piston 2, and the axial flow passage 211 is communicated with the pressure chamber 15; the radial flow passage 212 extends in the radial direction of the piston 2, one end of the radial flow passage 212 communicates with the axial flow passage 211, and the other end thereof penetrates the inner bottom wall of the annular groove. The gnawing prevention structure 5 is arranged in the annular groove. Illustratively, the anti-biting structure 5 is a C-shaped ring, so that the anti-biting structure 5 is conveniently embedded in the annular groove. It should be noted that the anti-gnawing structure 5 is not limited to a C-shaped ring, and it is sufficient to ensure that the anti-gnawing structure 5 can be fixedly installed in the annular groove, for example, the anti-gnawing structure 5 is formed by sequentially connecting two or more arc-shaped sections.
Alternatively, at least two radial flow passages 212 are provided, and at least two radial flow passages 212 are provided at intervals in the circumferential direction of the piston 2. In order to ensure that the first sealing element 3 passes through the anti-biting structure 5, the anti-biting structure 5 can be effectively abutted against the first sealing element 3 to ensure the sealing effect, and the axial opening on the periphery of the C-shaped ring is positioned between two adjacent radial flow channels 212 along the circumferential direction of the piston 2, even if the axial opening on the periphery of the C-shaped ring avoids the arrangement of the radial flow channels 212.
Further, in order to ensure the installation position of the anti-bite structure 5 and ensure that the opening of the C-shaped ring is between the two radial flow channels 212, a limiting member of the C-shaped ring may be disposed in the annular groove for limiting the end arm of the C-shaped ring to rotate circumferentially along the inner wall of the annular groove. The limiting piece can be a protrusion arranged on the annular groove or a protrusion arranged on the C-shaped ring, and the rotation of the C-shaped ring is limited by the radial insertion of the limiting piece and the piston 2; the number of the projections may be 1 or more than 2, and the number is not limited. In other embodiments, when the anti-biting structure 5 is mounted on the inner circumferential wall of the cylinder 1, a stopper is also required to limit the rotation of the C-ring.
In this embodiment, the C-ring is partially inserted into the radial flow channel 212 to form the above-mentioned limiting member, and there is no need to provide a slot on the piston, so that the existing structure of the piston 2 is fully utilized, and the cost is reduced. However, when the stopper is formed by inserting the C-ring into the radial flow passage 212, the fluid in the radial flow passage 212 must not be prevented from entering or exiting.
Further, prevent gnawing and eat structure 5 and including can the butt act on preventing gnawing of first sealing member 3 and eat the face, prevent gnawing and eat the face and prevent gnawing and eat the periphery wall of piston 2 that structure 5 is located and flush, not only can guarantee that piston 2 moves to gnawing when eating the position, prevent gnawing and eat the face and can act on first sealing member 3 effectively in order to prevent that first sealing member 3 from gnawing and eat, can also avoid preventing effectively that gnawing and eat structure 5 and cause the interference to the axial displacement of piston 2. Illustratively, the peripheral wall of the piston 2 connected with the inner wall of the annular groove is flush with the anti-biting surface, namely, the peripheral wall of the C-shaped ring and the peripheral wall of the piston 2 positioned at two axial ends of the C-shaped ring and connected with the C-shaped ring are arranged in an equal diameter mode. It should be noted that the flush is not strictly the same, and the outer peripheral wall of the C-ring is slightly lower or slightly higher than the outer peripheral wall of the piston 2 in consideration of errors caused by machining and assembling, but the effect on the sealing effect of the first sealing member 3 is within the consideration of the "flush" in the case of actual sealing allowance.
Further, as shown in fig. 4, 6 and 7, in order to mount the first seal 3 on the inner circumferential wall of the housing 1, the inner circumferential wall of the housing 1 is provided with an annular seal groove 121, and the first seal 3 is fitted in the annular seal groove 121. The second seal 4 is mounted in the same manner as the first seal 3 and will not be described again here. It should be noted that the bowl mouths of the first sealing member 3 and the second sealing member 4 are arranged opposite to each other based on the sealing effect to be achieved by the first sealing member 3 and the second sealing member 4.
Optionally, when the first sealing element 3 adopts a cup structure, the peripheral edge of the cup structure has a folded edge which is turned over outwards and approximately in a V shape with the central axis of the cup, and the arrangement of the folded edge enables the cup structure to generate large elastic deformation in the pressure building process, so that the service life of the cup structure can be shortened. For this reason, in the present embodiment, the inner bottom wall of the annular sealing groove 121 is provided with the anti-surface 1211 matching with the surface profile of the first sealing element 3 contacting with the annular sealing groove, and the first sealing element 3 is supported by the anti-surface 1211, so as to reduce the deformation amount and the distortion deformation of the first sealing element 3, thereby improving the service life of the cup structure. Illustratively, the anti-forming surface 1211 is a conical surface, and the distance from the conical surface to the central axis of the cup structure gradually decreases from the inner bottom wall 111 of the housing 1 to the opening end of the housing 1.
Further, as shown in fig. 3 and fig. 6, the housing 1 includes a valve body 12 and a cylinder 11, wherein a through hole 122 is formed in the valve body 12, an opening of the cylinder 11 is formed at one end of the through hole 122, one end of the piston 2 is inserted into the through hole 122 from the open end of the cylinder 11 and is in sliding fit with the through hole 122 along the axial direction of the piston 2, the cylinder 11 is disposed at the other end of the through hole 122, and the cylinder 11 is fixedly connected to the valve body 12, and encloses the pressure chamber 15 with the inner wall of the through hole 122 and the piston 2.
Alternatively, the valve body 12 and the cylinder 11 are integrally formed. Specifically, as shown in fig. 8, a blank 100 is formed by extrusion molding, the blank 100 is a plate-shaped structure and has a protrusion formed on one side thereof, and is cut to form a semi-finished product 200, and then the semi-finished product 200 is machined to form the housing 1 integrating the valve body 12 and the cylinder 11, wherein the protrusion finally forms the cylinder 11. Due to the arrangement, material waste can be avoided, and the split arrangement of the valve body and the cylinder body, parts such as sealing pieces such as O-shaped rings and fixing screws required to be adopted when the valve body and the cylinder body are sleeved inside and outside, and a positioning structure between the valve body and the cylinder body are omitted, so that the structure of a pressure control unit is simplified, and the production cost is reduced; only need to fix a position piston 2 and casing 1 can, under the unchangeable circumstances of machining precision maintenance, reduced the size chain, improved the axiality of cylinder body 11 and valve body 12, reduced the risk that piston 2 takes place the eccentric wear. In addition, the brake fluid leakage point of the brake system can be reduced, and the reliability and the driving safety of the brake system are improved.
When the braking system has a braking request, the functions of pressure increasing, pressure maintaining, pressure releasing and liquid supplementing can be realized through the movement of the piston 2 of the pressure control unit.
When the piston 2 is at the communication position, the intermediate flow passage 21 is communicated with the housing flow passage 13, and the brake fluid can enter the pressure chamber 15 through the housing flow passage 13 and the intermediate flow passage 21 to replenish the pressure chamber 15.
In the process that the piston 2 moves from the connection position to the disconnection position, after the first sealing element 3 passes over the anti-biting structure 5, the brake fluid in the pressure cavity 15 is discharged through the second inlet and outlet hole 14, and pressurization is realized.
While the piston 2 is held at the off position, the holding pressure is achieved.
When the piston 2 moves from the disconnection position to the connection position, the first sealing member 3 passes over the anti-biting structure 5, and then the brake fluid in the pressure chamber 15 flows out through the intermediate flow passage 21 and the housing flow passage 13, thereby achieving pressure release.
Example two
The present embodiment is different from the first embodiment in that, as shown in fig. 9 to 11, the cylinder 11 and the valve body 12 may be fixed by caulking. Specifically, the cylinder body 11 which is open at one end and is barrel-shaped is formed by a punch forming manner, the opening edge of the cylinder body 11 is turned outwards to form the riveting flange 112, the riveting groove 123 is arranged on the opening end surface of the through hole 122 which is opposite to the piston 2, and the riveting flange 112 is riveted in the riveting groove 123 to form the shell 1. The riveting flange 112 is fixed in the riveting groove 123 by means of pressure riveting, so that the function of connecting the cylinder body 11 and the valve body 12 can be achieved, and the contact surface between the riveting flange 112 and the riveting groove 123 can be sealed, so that the sealing performance of the pressure cavity 15 can be ensured. The shell 1 processed and formed by the method has the advantages of high production efficiency and low cost.
In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (13)
1. A pressure control unit comprising:
the brake block comprises a shell (1), wherein a shell runner (13) is arranged on the shell (1), and the shell runner (13) is used for connecting an oil supply channel of a brake part;
the piston (2) is movably arranged in the shell (1) along the axial direction of the piston (2) and is provided with a pressure cavity (15), and a middle flow passage (21) communicated with the pressure cavity (15) is arranged on the piston (2); the piston (2) has a communication position for communicating the intermediate flow passage (21) with the housing flow passage (13) and a disconnection position for disconnecting the intermediate flow passage (21) from the housing flow passage (13);
a first seal (3), the first seal (3) being sealingly arranged between the piston (2) and the housing (1);
the piston (2) is characterized by further comprising a biting position, and when the piston (2) moves to the biting position, at least one part of the middle flow passage (21) and the shell flow passage (13) is opposite to the first sealing element (3); the gnawing position is the connection position, the disconnection position or a position between the connection position and the disconnection position;
the pressure control unit further includes:
an anti-gnawing structure (5), wherein the anti-gnawing structure (5) is located between the piston (2) and the housing (1), one of the anti-gnawing structures (5) is arranged on the piston (2), the other one is arranged on the housing (1), and the anti-gnawing structure (5) is configured to: the intermediate flow channel (21) can be communicated with the shell flow channel (13) through the anti-bite structure (5) when the piston (2) is at a communication position; the piston (2) can also abut against the first seal (3) when in the gnawing position.
2. Pressure control unit according to claim 1, characterized in that the anti-gnawing structure (5) is a porous structure.
3. Pressure control unit according to claim 1, characterized in that the anti-gnawing structure (5) is a C-ring.
4. The pressure control unit according to claim 3, characterized in that the first seal (3) is embedded in the housing (1), the anti-gnawing structure (5) is embedded in the piston (2) and covers the outlet of the intermediate flow channel (21);
or the first sealing element (3) is embedded in the piston (2), and the anti-biting structure (5) is embedded in the shell (1) and covers the outlet of the shell flow passage (13).
5. The pressure control unit according to claim 4, wherein the anti-gnawing structure (5) comprises an anti-gnawing surface capable of abutting against the first sealing element (3), and the anti-gnawing surface is flush with the inner peripheral wall of the housing (1) or the outer peripheral wall of the piston (2) where the anti-gnawing structure (5) is located.
6. Pressure control unit according to claim 4, characterized in that the anti-gnawing structure (5) is provided on the piston (2), the piston (2) comprising:
the annular groove is communicated with the middle flow passage (21), the annular groove is formed in the outer peripheral wall of the piston (2), and the anti-gnawing structure (5) is installed in the annular groove;
an axial flow channel (211), the axial flow channel (211) communicating with the pressure chamber (15);
a radial flow passage (212) in communication with the annular groove and the axial flow passage (211).
7. The pressure control unit of claim 6, characterized in that the radial flow passages (212) are provided in at least two, at least two of the radial flow passages (212) being provided at intervals in the circumferential direction of the piston (2);
the opening of the C-shaped ring is positioned between two adjacent radial flow passages (212).
8. Pressure control unit according to claim 7, characterized in that a stop is provided in the intermediate flow channel (21) for preventing the C-ring from rotating circumferentially relative to the piston (2).
9. The pressure control unit of claim 8, wherein insertion of a portion of the C-ring into the radial flow passage (212) forms the stop.
10. A pressure control unit according to claim 3, characterized in that the inner circumferential wall of the housing (1) or the outer circumferential wall of the piston (2) is provided with an annular sealing groove (121), the first seal (3) being mounted in the annular sealing groove (121);
the inner bottom wall of the annular sealing groove (121) is an anti-forming surface (1211) matched with the surface shape of the first sealing element (3) contacted with the inner bottom wall.
11. Pressure control unit according to any of claims 1 to 10, characterized in that the first seal (3) is of cup construction.
12. Pressure control unit according to any of claims 1 to 10, characterized in that the housing (1) comprises:
the valve body (12) is provided with a through hole (122) which is arranged in a through mode, and the piston (2) is movably arranged in the through hole (122);
the cylinder body (11), the said cylinder body (11) is fixedly connected with said valve block (12);
the cylinder body (11) and the valve body (12) are integrally formed, or the cylinder body (11) and the valve body (12) are fixedly connected.
13. A braking system comprising a pressure control unit according to any one of claims 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210771374.8A CN115009241B (en) | 2022-06-30 | 2022-06-30 | Pressure control unit and braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210771374.8A CN115009241B (en) | 2022-06-30 | 2022-06-30 | Pressure control unit and braking system |
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| CN115009241A true CN115009241A (en) | 2022-09-06 |
| CN115009241B CN115009241B (en) | 2024-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210771374.8A Active CN115009241B (en) | 2022-06-30 | 2022-06-30 | Pressure control unit and braking system |
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| CN206797362U (en) * | 2017-05-26 | 2017-12-26 | 吉林东光奥威汽车制动***有限公司 | A kind of first piston member fitting structure for improving center valve type master cylinder braking ability |
| CN209340383U (en) * | 2018-10-26 | 2019-09-03 | 余姚鑫仕达汽车部件有限公司 | A kind of sealing structure of wheel cylinder piston |
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- 2022-06-30 CN CN202210771374.8A patent/CN115009241B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH437009A (en) * | 1965-05-04 | 1967-05-31 | Beka St Aubin Sa | Master cylinder for operating hydraulic brakes |
| JP2001180471A (en) * | 1999-12-24 | 2001-07-03 | Bosch Braking Systems Co Ltd | Plunger type master cylinder |
| CN2565691Y (en) * | 2002-09-17 | 2003-08-13 | 徐瑞祥 | Double pipeline hydraulic brake main cylinder |
| CN1448298A (en) * | 2003-04-28 | 2003-10-15 | 浙江亚太机电股份有限公司 | Sealed unloading device in brake master cylinder assembly for vehicle |
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| CN115009241B (en) | 2024-03-01 |
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