KR20110137684A - Master cylinder for vehicles - Google Patents

Master cylinder for vehicles Download PDF

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Publication number
KR20110137684A
KR20110137684A KR1020100057746A KR20100057746A KR20110137684A KR 20110137684 A KR20110137684 A KR 20110137684A KR 1020100057746 A KR1020100057746 A KR 1020100057746A KR 20100057746 A KR20100057746 A KR 20100057746A KR 20110137684 A KR20110137684 A KR 20110137684A
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KR
South Korea
Prior art keywords
sealing member
cylinder
working fluid
hydraulic chamber
piston
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KR1020100057746A
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Korean (ko)
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KR101612279B1 (en
Inventor
구창회
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현대모비스 주식회사
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Priority to KR1020100057746A priority Critical patent/KR101612279B1/en
Publication of KR20110137684A publication Critical patent/KR20110137684A/en
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Publication of KR101612279B1 publication Critical patent/KR101612279B1/en

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Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle master cylinder, and more particularly to a vehicle master cylinder which reduces the actuation force of the brake pedal by reducing the pressure action area.
The present invention includes a cylinder having an inlet port through which the working fluid is introduced and an outlet port through which the working fluid is discharged; A piston having an outer diameter smaller than the inner diameter of the cylinder and inserted into the cylinder to be protruding from the cylinder; It provides a vehicle master cylinder comprising a sealing member for forming a hydraulic chamber in which a working fluid is compressed in the interval between the cylinder and the piston circumferential surface.

Description

Car Master Cylinder {MASTER CYLINDER FOR VEHICLES}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle master cylinder, and more particularly to a vehicle master cylinder which reduces the actuation force of the brake pedal by reducing the pressure action area.

If the brake of the vehicle detects the operation of the brake pedal operated by the driver, the electric booster operates according to the signal transmitted from the controller, so that hydraulic pressure of the working fluid is generated in the master cylinder and the wheel is transmitted by the hydraulic pressure transmitted from the master cylinder. As the cylinder is operated, the wheel is braked.

The electric booster is an actuator which pressurizes the master cylinder, and the spindle having a screw and nut structure presses the piston of the master cylinder while performing a linear motion under the rotational force of the motor.

The hydraulic pressure generated in the master cylinder operates the wheel cylinder to brake the wheel.

Braking as described above is performed by the operation of the brake pedal, the operating force of the brake pedal is proportional to the pedal ratio of the brake pedal, inversely proportional to the power ratio of the brake system, proportional to the pressure working area of the wheel cylinder, the master cylinder It is inversely proportional to the pressure acting area.

To explain this in detail, in order for the driver to use the small force to operate the brake pedal, the power ratio of the brake system must be increased, the pressure working area of the wheel cylinder must be increased, and the pressure working area of the master cylinder must be reduced.

Here, the pressure action area means a space in which the working fluid is contained and compressed to generate hydraulic pressure.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

A general vehicle braking device performs a design for increasing the operating force of the brake pedal. Increasing the pedal ratio of the brake pedal increases the force that the bracket for supporting the brake pedal increases, which makes it difficult to reduce the weight of the product.

In addition, there is a problem in that the weight of the product is increased by increasing the pressure action area of the wheel cylinder to reduce the operating force of the brake pedal.

Therefore, there is a need for improvement.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle master cylinder which reduces the pressure acting area to increase the operating force of the brake pedal.

In order to achieve the above object, the present invention, the inlet port in which the working fluid is introduced and the cylinder is formed with the outlet port is discharged working fluid; A piston having an outer diameter smaller than the inner diameter of the cylinder and inserted into the cylinder to be protruding from the cylinder; It provides a vehicle master cylinder comprising a sealing member for forming a hydraulic chamber in which a working fluid is compressed in the interval between the cylinder and the piston circumferential surface.

The piston may include a large diameter part inserted into the cylinder; A small diameter part which is formed to have an outer diameter smaller than that of the large diameter part and which is projected to the outside of the cylinder; And a mounting groove formed between the large diameter portion and the small diameter portion and into which the sealing member is inserted.

In addition, the sealing member, the first sealing member is installed on the inner wall of the cylinder; A second sealing member installed in the mounting groove and constituting the first sealing member and the hydraulic chamber; A third sealing member installed in the cylinder to maintain a distance from the first sealing member; And a fourth sealing member installed in the opening of the cylinder so as to maintain a distance from the second sealing member.

In addition, the cross-sectional shape of the first sealing member, the second sealing member and the third sealing member is characterized in that it is formed in a 'c' shape opening is formed at one end.

The inflow port may further include a first inflow port communicating with a space between the first sealing member and the third sealing member; A second inlet port in communication with the hydraulic chamber; And a third inflow port communicating with a space between the second sealing member and the fourth sealing member.

The piston may include a small diameter portion inserted into the cylinder; A large diameter part having an outer diameter larger than that of the small diameter part and extending to be protruded out of the cylinder; And a passage groove formed between the small diameter portion and the large diameter portion and forming a flow path of the working fluid.

The sealing member may include a pair of first sealing members installed to maintain a gap on the inner wall of the cylinder to form the hydraulic chamber; And a second sealing member installed at a distance from the first sealing member; The inflow port is in communication with the space between the first sealing member and the second sealing member.

In addition, the cross-sectional shape of the sealing member is characterized in that it is formed in a 'c' shape opening is formed at one end.

In the vehicle master cylinder according to the present invention, since the hydraulic chamber is formed in the gap between the cylinder inner wall and the piston circumferential surface, it is possible to easily reduce the pressure action area of the master cylinder using a general sealing member, thereby increasing the operating force of the brake pedal. There is an advantage that can be designed easily.

1 is a cross-sectional view showing a vehicle master cylinder according to an embodiment of the present invention.
2 is a cross-sectional view showing a vehicle master cylinder according to another embodiment of the present invention.

Hereinafter, an embodiment of a vehicle master cylinder according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom.

Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a cross-sectional view showing a vehicle master cylinder according to an embodiment of the present invention.

Referring to FIG. 1, a vehicle master cylinder according to an embodiment of the present invention includes a cylinder 10 having an inlet port 12 through which working fluid is introduced and an outlet port 14 through which working fluid is discharged, and a cylinder ( A hydraulic pressure in which the working fluid is compressed at a distance between the piston 30 which is smaller than the inner diameter of 10) and is inserted into the cylinder 10 so as to be protruded and the inner wall of the cylinder 10 and the circumferential surface of the piston 30. Sealing member 50 to form a seal (70).

The working fluid is supplied to the hydraulic chamber 70 through the inlet port 12 in accordance with the pressure change generated when the piston 30 emerges in and out of the cylinder 10, and the hydraulic chamber is operated by the operation of the piston 30. The working fluid compressed at 70 is discharged to the outside of the cylinder 10 along the outlet port 14.

Since the hydraulic chamber 70 of the present embodiment is formed between the circumferential surface of the piston 30 and the inner wall of the cylinder 10, the cross-sectional shape of the hydraulic chamber 70 forms a ring shape, indicating that the pressure acting area of the master cylinder is reduced. Can be.

When the pressure acting area of the master cylinder is reduced, the operating force of the brake pedal is increased. Therefore, the force generated when the user operates the brake pedal is increased, so that the user can easily operate the brake device even when the user operates the brake pedal with a small force. Will be.

The piston 30 has a large diameter portion 34 inserted into the cylinder 10, a small diameter portion 32 formed outside the cylinder 10 in a smaller diameter than the large diameter portion 34, and floated out of the cylinder 10, and a large diameter portion. And a mounting groove 36 formed between the 34 and the small diameter portion 32 and into which the sealing member 50 is inserted.

Since the outer diameter of the large diameter portion 34 is smaller than the inner diameter of the cylinder 10, the hydraulic chamber 70 is formed between the circumferential surface of the large diameter portion 34 and the inner wall of the cylinder 10, and the piston 30 When inserted into the cylinder 10, the sealing member 50 installed in the mounting groove 36 pressurizes the working fluid filled in the hydraulic chamber 70 to discharge the working fluid through the outlet port 14.

The sealing member 50 includes a first sealing member 52 installed on the inner wall of the cylinder 10 and a second sealing member installed on the mounting groove 36 and forming the first sealing member 52 and the hydraulic chamber 70. 54, the third sealing member 56 installed in the cylinder 10 so as to maintain a distance from the first sealing member 52, and the third sealing member 56 provided in the cylinder 10 so as to maintain a distance from the second sealing member 54. And a fourth sealing member 58 provided in the opening.

Since the working fluid filled in the hydraulic chamber 70 is not lost to the outside of the hydraulic chamber 70 by the first sealing member 52 and the second sealing member 54, the piston 30 is inserted into the cylinder 10. When the second sealing member 54 is moved toward the first sealing member 52, the working fluid is pressurized to discharge the working fluid through the outlet port 14.

The cross-sectional shapes of the first sealing member 52, the second sealing member 54, and the third sealing member 56 are formed in a 'c' shape in which an opening is formed at one end thereof, so that the working fluid proceeds in the opening direction. Is deformed inward to pass through the first sealing member 52, the second sealing member 54, and the third sealing member 56.

On the contrary, the working fluid proceeding in the opposite direction of the opening causes the opening to expand outward, thereby preventing the first sealing member 52, the second sealing member 54, and the third sealing member 56 from passing through the opening.

Since the openings of the first sealing member 52 and the second sealing member 54 are installed to face the inside of the hydraulic chamber 70, the working fluid moved toward the hydraulic chamber 70 may be the first sealing member 52 and the second sealing member 52. The opening of the sealing member 54 is moved into the hydraulic chamber 70 while deforming inwardly.

The working fluid filled in the hydraulic chamber 70 is the first sealing member 52 and the second sealing member when the hydraulic chamber 70 is compressed by the movement of the piston 30 and the second sealing member 54 ( Since the opening of the 54 is expanded, it does not pass through the first sealing member 52 and the second sealing member 54 and is discharged to the wheel cylinder through the outlet port 14.

The inflow port 12 has a first inflow port 12a communicating with the space between the first sealing member 52 and the third sealing member 56 and a second inflow port 12b communicating with the hydraulic chamber 70. ) And a third inflow port 12c communicating with the space between the second sealing member 54 and the fourth sealing member 58.

The working fluid flowing through the first inflow port 12a flows into the space between the first sealing member 52 and the third sealing member 56, and when the piston 30 protrudes out of the cylinder 10. Since the pressure in the hydraulic chamber 70 is lowered, the hydraulic chamber 70 flows into the hydraulic chamber 70 while deforming the opening of the first sealing member 52 inward.

The working fluid supplied through the second inflow port 12b flows directly into the hydraulic chamber 70, and between the second sealing member 54 and the fourth sealing member 58 through the third inflow port 12c. The working fluid flowing into the space is introduced into the hydraulic chamber 70 while deforming the second sealing member 54 through the hole 36a formed in the mounting groove 36.

The cylinder 10 of the present embodiment has a substantially constant inner diameter and is inserted into the large diameter portion 34 of the piston 30 having a smaller outer diameter than the inner diameter of the cylinder 10, so that the circumferential surface of the large diameter portion 34 The fourth sealing member 58 is installed in the opening of the cylinder 10 so that the working fluid flowing into the space between the cylinder 10 and the inner wall of the cylinder 10 is not lost to the outside through the opening of the cylinder 10.

The fourth sealing member 58 is provided with a plurality of fourth sealing members 58 formed in an O-ring shape on the inner wall of the cylinder 10, and washers 58a for preventing the flow of the plurality of fourth sealing members 58. Is installed.

Since the inner diameter of the cylinder 10 of the present embodiment is substantially constant and a small amount of inner diameter changes, the inner diameter of the cylinder 10 changes to increase as the inner diameter increases toward the opening side, thereby forming the inner diameter of the cylinder 10 when the cylinder 10 is manufactured by the injection process. The shape of the core is simple and the mold removal operation can be easily performed.

Looking at the operation of the vehicle master cylinder according to an embodiment of the present invention configured as described above are as follows.

When the piston 30 protrudes out of the cylinder 10, the second sealing member 54 is moved toward the opening side of the cylinder 10, and the internal pressure of the hydraulic chamber 70 is lowered, thereby being supplied through the inlet port 12. The working fluid flows into the hydraulic chamber 70.

At this time, the working fluid supplied along the first inflow port 12a is moved to the hydraulic chamber 70 while deforming the first sealing member 52, and the working fluid supplied along the second inflow port 12b is directly The hydraulic fluid flowing into the hydraulic chamber 70 and supplied along the third inflow port 12c passes through the hole portion 36a of the mounting groove 36 and deforms the second sealing member 54 while the hydraulic fluid 70 is opened. Is moved to.

When the piston 30 is inserted into the cylinder 10 after the working fluid is filled in the hydraulic chamber 70, the second sealing member 54 compresses the working fluid filled in the hydraulic chamber 70. It is discharged to the wheel cylinder side along the outlet port 14.

At this time, the working fluid moved toward the first sealing member 52 and the second sealing member 54 is introduced into the opening portion and expands the first sealing member 52 and the second sealing member 54, so that the working fluid is formed. It does not pass through the first sealing member 52 and the second sealing member 54 and is moved toward the outlet port 14.

As described above, the hydraulic chamber 70 in which the working fluid is compressed is formed by the first sealing member 52 and the second sealing member 54, and the circumferential surface of the piston 30 and the inner wall of the cylinder 10. Since it is disposed between the effects of reducing the pressure working area of the master cylinder.

2 is a cross-sectional view showing a vehicle master cylinder according to another embodiment of the present invention.

2, the piston 130 of the vehicle master cylinder according to another embodiment of the present invention has a larger outer diameter than the small diameter portion 132 and the small diameter portion 132 inserted into the cylinder 110. Large diameter portion 134 extending to be projected to the outside of the cylinder 110, a through groove formed between the small diameter portion 132 and the large diameter portion 134 and forming a flow path of the working fluid flowing along the inlet port 112 136.

When the piston 130 protrudes from the cylinder 110, when the passage groove 136 is disposed to face the sealing member 150, the working fluid supplied along the inlet port 112 is provided with the sealing member 150 and the passage groove ( It is supplied to the hydraulic chamber 170 along the interval between 136.

Subsequently, when the piston 130 is inserted into the cylinder 110, the large diameter portion 134 is inserted into the hydraulic chamber 170 and pressurizes the working fluid filled in the hydraulic chamber 170, thus along the outlet port 114. The working fluid is discharged.

The sealing member 150 is installed to maintain a gap on the inner wall of the cylinder 110 to form a pair of the first sealing member 152 and the first sealing member 152 to form a hydraulic chamber 170. It includes a pair of second sealing member 154.

When the piston 130 protrudes out of the cylinder 110, the working fluid supplied along the inlet port 112 passes through the first sealing member 152 and is filled into the hydraulic chamber 170, and the piston 130 is When inserted into the cylinder 110, the large diameter portion 134 of the piston 130 is inserted into the hydraulic chamber 170 to pressurize the working fluid.

The cross-sectional shape of the sealing member 150 is formed in a 'c' shape in which an opening is formed at one end, and the opening of the sealing member 150 is disposed to face the central side of the hydraulic chamber 170.

Therefore, the working fluid flowing into the space between the first sealing member 152 and the second sealing member 154 is not lost to the outside of the cylinder 110 by the second sealing member 154, and thus to the hydraulic chamber 170. The filled working fluid is not lost to the outside of the hydraulic chamber 170 by the first sealing member 152.

The vehicle master cylinder according to another embodiment of the present invention has a larger inner diameter of the cylinder 110 opposite to the hydraulic chamber 170 than the inner diameter of other portions, and the opening of the cylinder 110 is inside the cylinder 110. The inner diameter is smaller than the inner diameter of.

As described above, since the inner diameter of the cylinder 110 is larger than the inner diameter of the opening, it is difficult to manufacture the cylinder 110, but the working fluid is not easily lost due to the interval between the piston 130 and the cylinder 110. Will not.

Therefore, the cylinder according to another embodiment of the present invention has an effect of reducing the number of parts since the O-ring sealing member and the washer 58a (see FIG. 1), such as the fourth sealing member 58 (see FIG. 1), are not installed. Will appear.

Reference numeral 180 is an elastic member 180 for protruding the piston 130 to the outside of the cylinder (110).

Thereby, it is possible to provide a vehicle master cylinder which reduces the pressure action area to increase the operating force of the brake pedal.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art. Will understand.

In addition, although the vehicle master cylinder has been described as an example, this is merely exemplary, and the master cylinder of the present invention may be used in a product other than the vehicle.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

10: cylinder 12: inlet port
14: outlet port 30: piston
32: small diameter 34: large diameter
36: mounting groove 50: sealing member
52: first sealing member 54: second sealing member
56: third sealing member 58: fourth sealing member

Claims (8)

A cylinder having an inlet port through which the working fluid is introduced and an outlet port through which the working fluid is discharged;
A piston having an outer diameter smaller than the inner diameter of the cylinder and inserted into the cylinder to be protruding from the cylinder;
And a sealing member forming a hydraulic chamber in which a working fluid is compressed at a distance between the cylinder and the piston circumferential surface.
The method of claim 1, wherein the piston,
A large diameter part inserted into the cylinder;
A small diameter part which is formed to have an outer diameter smaller than that of the large diameter part and which is projected out of the cylinder; And
And a mounting groove formed between the large diameter portion and the small diameter portion and into which the sealing member is inserted.
The method of claim 2, wherein the sealing member,
A first sealing member installed on the inner wall of the cylinder;
A second sealing member installed in the mounting groove and constituting the first sealing member and the hydraulic chamber;
A third sealing member installed in the cylinder to maintain a distance from the first sealing member; And
And a fourth sealing member installed in the opening of the cylinder so as to maintain a distance from the second sealing member.
The method of claim 3,
The cross-sectional shape of the first sealing member, the second sealing member and the third sealing member is formed in a 'c' shape in which an opening is formed at one end.
The method of claim 3, wherein the inlet port,
A first inflow port communicating with a space between the first sealing member and the third sealing member;
A second inlet port in communication with the hydraulic chamber; And
And a third inflow port communicating with a space between the second sealing member and the fourth sealing member. The method of claim 1, wherein the piston,
A small diameter portion inserted into the cylinder;
A large diameter part having an outer diameter larger than that of the small diameter part and extending to be protruded out of the cylinder; And
And a passage groove formed between the small diameter portion and the large diameter portion to form a flow path of the working fluid.
The method of claim 6, wherein the sealing member,
A pair of first sealing members installed on the inner wall of the cylinder to form a gap; And
A second sealing member installed at a distance from the first sealing member;
The inlet port communicates with the space between the first sealing member and the second sealing member.
According to claim 7,
Cross-sectional shape of the sealing member is a vehicle master cylinder, characterized in that formed in the 'c' shape opening is formed at one end.
KR1020100057746A 2010-06-17 2010-06-17 Master cylinder for vehicles KR101612279B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100057746A KR101612279B1 (en) 2010-06-17 2010-06-17 Master cylinder for vehicles

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Application Number Priority Date Filing Date Title
KR1020100057746A KR101612279B1 (en) 2010-06-17 2010-06-17 Master cylinder for vehicles

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KR20110137684A true KR20110137684A (en) 2011-12-23
KR101612279B1 KR101612279B1 (en) 2016-04-14

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130067171A (en) * 2011-12-13 2013-06-21 현대모비스 주식회사 Master cylinder for vehicle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001058567A (en) * 1999-08-23 2001-03-06 Shinei Kogyo Kk Master cylinder
JP4073780B2 (en) * 2002-12-24 2008-04-09 本田技研工業株式会社 Master cylinder
FR2916406B1 (en) * 2007-05-22 2009-07-10 Bosch Gmbh Robert MASTER CYLINDER COMPRISING A JOINT AND AN ASSOCIATED THROAT ENHANCING THE REALIMENTATION.
FR2931424B1 (en) * 2008-05-21 2010-05-28 Bosch Gmbh Robert MASTER CYLINDER WITH REDUCED STROKE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130067171A (en) * 2011-12-13 2013-06-21 현대모비스 주식회사 Master cylinder for vehicle

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KR101612279B1 (en) 2016-04-14

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