KR20140105930A - Master cylinder and electric hydraulic apparatus using there of - Google Patents

Abstract

The present invention comprises the following parts: a master cylinder piston to compress the pedal simulator piston of a master cylinder by improving a connection structure; a push rod plate moving according to the movement of a brake pedal in order to reduce the overall length of the electric hydraulic apparatus; a push rod moving according to the movement of the push rod plate to generate hydraulic pressure; a pedal simulator to be compressed by the hydraulic pressure generated by the push rod; and a master cylinder body formed with a push rod chamber in which the push rod is mounted and a pedal simulator chamber in which the pedal simulator is mounted. The push rod and the pedal simulator are mounted together in the master cylinder body, thereby reducing the overall length and volume of the electric hydraulic apparatus.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a master cylinder and an electric hydraulic system using the master cylinder.

The present invention relates to a master cylinder and an electric hydraulic apparatus, and more particularly, to a master cylinder capable of reducing a total length of a master cylinder and an electric hydraulic apparatus by improving a connection structure for compressing a pedal simulator piston, and an electric hydraulic apparatus .

Recently, development of hybrid vehicles, fuel cell vehicles, electric vehicles, and the like are actively being carried out in order to improve fuel efficiency and reduce exhaust gas. In such a vehicle, a braking system, that is, a braking system, is installed. Here, the braking system of the braking system refers to a device that functions to reduce or stop the speed of a running vehicle.

Since this brake system is required to supply the suction pressure of the vehicle engine to the vacuum booster for vacuum formation, a separate engine or vacuum generator must be provided.

However, in an EV (Hybrid) vehicle in which an EV (Electronic Vehicle) vehicle that does not have a general vacuum generating engine or a Hybrid vehicle in which an engine does not operate at all is not equipped with a separate vibration generating device, it is difficult to generate a back pressure satisfying the braking force of the vehicle There is a problem.

Therefore, in recent years, an electric hydraulic apparatus using a motor instead of a vacuum booster has been developed.

In such an electric hydraulic apparatus, the screw-type moving unit reciprocates according to the rotation of the motor to compress the master cylinder, and transmits the braking hydraulic pressure to each wheel cylinder to perform the braking operation.

However, since a conventional electric hydraulic device has a pedal simulator installed to compensate for a feeling similar to when the driver depresses the brake pedal when the brake pedal is stepped on, the electric hydraulic device has a long electric field And there is a problem that the volume increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a pedal simulator in which a pedal simulator of an electric hydraulic apparatus is integrated with a master cylinder and a connection structure for compressing a pedal simulator piston of the electric hydraulic apparatus is arranged in parallel on a master cylinder, And to provide an electric hydraulic apparatus using the master cylinder.

According to an aspect of the present invention, there is provided a master cylinder comprising: a master cylinder piston moved by a rotational force of a motor; A push rod plate moved in accordance with the movement of the brake pedal; A push rod that is moved in accordance with the movement of the push rod plate to generate hydraulic pressure; A pedal simulator that is compressed by the hydraulic pressure generated by the push rod; A master cylinder body having a master cylinder chamber in which the master cylinder piston is accommodated, a push rod chamber in which the push rod is accommodated, and a pedal simulator chamber in which the pedal simulator is accommodated; And a master cylinder body cover coupled to the master cylinder body to guide movement of the push rod plate.

Further, the master cylinder chamber, the push rod chamber, and the pedal simulator chamber are parallel to each other.

Further, the push rod is composed of a plurality of push rods, and the push rod chamber formed in the master cylinder body includes a plurality of push rods, respectively.

Further, the master cylinder piston is composed of a first master cylinder piston and a second master cylinder piston having the same center axis, and the push rod is composed of a first push rod and a second push rod having different center axes.

Further, the first master cylinder piston, the second master cylinder piston, the first push rod, and the second push rod are parallel to each other.

In the master cylinder body cover, a guide groove for guiding the movement of the push rod plate is formed, and a guide portion for moving the push rod plate along the guide groove is formed.

Further, the guide groove and the guide portion are formed in plural.

The pedal simulator further comprises: a first pedal simulator piston moved by the hydraulic pressure generated by the push rod; A first pedal simulator spring that is compressed by movement of the first pedal simulator piston; A second pedal simulator piston moved by compression of the first pedal simulator spring; And a second pedal simulator spring which is compressed by movement of the second pedal simulator piston.

Further, the first pedal simulator piston and the second pedal simulator piston are moved in parallel with the master cylinder piston.

Also, the diameter of the first pedal simulator piston is smaller than the diameter of the second pedal simulator piston, and the pedal simulator chamber is stepped to accommodate the first pedal simulator piston and the second pedal simulator piston of different diameters .

Also, the pedal simulator may include a filling damper which is compressed by the movement of the second pedal simulator piston; A plunger damper compressed by movement of the second pedal simulator piston; And an end plug connected to the second pedal simulator spring and sealing the pedal simulator chamber.

The filling damper is formed with an insertion groove, and the plunger damper is inserted into the insertion groove of the filling damper.

The inserting portion of the end plug may be formed with a first inserting groove into which the plunger damper is inserted, and the filling damper may be formed in the inserting portion of the end plug A second insertion groove into which the insertion portion is inserted, and a third insertion groove into which the plunger damper is inserted.

The motor-driven hydraulic device according to an embodiment of the present invention includes an electric booster that senses a signal according to a pedal force and transmits electric power in an electric mode, and a master that receives power output from the electric booster and transmits hydraulic pressure to a wheel cylinder 1. An electric hydraulic apparatus including a cylinder, wherein the master cylinder is a master cylinder piston which is moved by a rotational force of a motor; A push rod plate moved in accordance with the movement of the brake pedal; A push rod that is moved in accordance with the movement of the push rod plate to generate hydraulic pressure; A pedal simulator that is compressed by the hydraulic pressure generated by the push rod; A master cylinder body having a master cylinder chamber in which the master cylinder piston is accommodated, a push rod chamber in which the push rod is accommodated, and a pedal simulator chamber in which the pedal simulator is accommodated; And a master cylinder body cover coupled to the master cylinder body to guide movement of the push rod plate.

The master cylinder piston is moved by the movement of the screw. The master cylinder piston is moved by the rotation of the motor, and the master cylinder piston is moved by the movement of the screw to prevent the interference of the push rod plate.

Further, the electric booster includes a control plunger which moves according to the movement of the brake pedal, and the push rod plate is moved by the movement of the control plunger.

Further, the master cylinder body cover may have a guide groove for guiding movement of the push rod plate, the push rod plate may include an insertion portion into which the control plunger is inserted; And a guide portion that is moved along a guide groove of the master cylinder body cover.

The master cylinder piston may include a first master cylinder piston and a second master cylinder piston having the same central axis, and the push rod may include a first push rod and a second push rod having different center axes, The master cylinder piston, the second master cylinder piston, the first push rod, and the second push rod are parallel to each other.

The master cylinder according to the present invention can reduce the total length and volume of the electric hydraulic apparatus because the master cylinder piston, the push rod, and the pedal simulator are accommodated together in the master cylinder body.

Further, since the master cylinder piston, the push rod and the pedal simulator are accommodated together in the master cylinder body, there is an economical effect in that the structure of the electric hydraulic apparatus is simplified and the cost is reduced.

1 is a side view of an electric hydraulic apparatus according to an embodiment of the present invention.
2 is a perspective view showing a part of an electric hydraulic apparatus according to an embodiment of the present invention.
3 is an exploded view of an electric booster of an electric hydraulic apparatus according to an embodiment of the present invention.
4 is an exploded view of a master cylinder of an electric hydraulic apparatus according to an embodiment of the present invention.
5 is a front view of an electric hydraulic apparatus according to an embodiment of the present invention.
FIG. 6 is a sectional view of the electric hydraulic apparatus according to an embodiment of the present invention shown in FIG. 5 taken along the direction XX '.
FIG. 7 is a view showing the interior of the electric hydraulic apparatus according to the embodiment of the present invention shown in FIG. 5 cut along the YY 'direction.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4, an electric hydraulic apparatus 100 according to an embodiment of the present invention includes an electric booster 110 that senses a signal according to the leg-power of a pedal (not shown) and transmits power by electric power, And a master cylinder 120 that receives the power output from the booster 110 to generate hydraulic pressure and transmits hydraulic pressure to a wheel cylinder (not shown).

The electric booster 110 may comprise a clevis 111, an input rod 112, a control plunger 113, a motor 114, a nut 115 and a screw 116.

The clevis 111 and the input rod 112 are moved in accordance with the movement of the pedal (not shown).

The control plunger 113 is moved in accordance with the movement of the input rod 112 to move the push rod plate 122 of the master cylinder 120 to be described later.

A protrusion 113a is formed at one side of the control plunger 113 to be connected to the push rod plate 122 of the master cylinder 120, which will be described later.

The motor 114 senses a signal corresponding to the pedal force and transmits the rotational force to the nut 115 side. A signal according to the pedaling force of the pedal may be transmitted through a pedal displacement sensor (not shown).

The nut 115 is rotated by receiving the rotational force of the motor 114. Such a nut 114 may be made of a ball nut to reduce friction.

The screw 116 is moved by the rotation of the nut 115. The screw 116 may be made of a ball screw to reduce friction with the nut 115.

An interference preventing portion 116a for preventing the interference of the push rod plate 122 of the master cylinder 120, which will be described later, is formed at one side of the screw 116. [ The interference preventing portion 116a may have a shape in which at least one groove 116b is formed so that the screw 116 can be moved without interfering with the push rod plate 122 of the master cylinder 120 described later.

On the other hand, the electric booster 110 may include a configuration such as a snap ring 117, a non-rotation plate 118, and the like.

The master cylinder 120 includes a master cylinder piston 121, a push rod plate 122, a push rod 123, a pedal simulator 124, a master cylinder body 125 and a master cylinder body cover 126 .

The master cylinder piston 121 is moved by the movement of the screw 116 to generate the hydraulic pressure and to transmit the hydraulic pressure to the wheel cylinder (not shown).

The master cylinder piston 121 may consist of a first master cylinder piston 121a and a second master cylinder piston 121b having the same center axis.

The master cylinder piston 121 may be provided with a sealing member 121c.

On the other hand, the master cylinder piston 121 can be moved by the movement of the push rod plate 122.

The push rod plate 122 is moved by the movement of the control plunger 113 to move the push rod 123.

The push rod plate 122 is formed with an insertion portion 122a into which the control plunger 113 is inserted.

The insertion portion 122a formed in the push rod plate 122 is inserted through the insertion groove 122b into which one end of the control plunger 113 is inserted and the projection 113a formed in one end of the control plunger 113 And an insertion hole (not shown).

The push rod plate 122 is formed with a guide portion 122c which is moved along the guide groove 126a of the master cylinder body cover 126, which will be described later.

The guide portion 122c may be formed in a plurality of shapes and may extend in a direction opposite to the insertion portion 122a.

The guide portion 122c may be formed with a groove into which the push rod 123 is inserted (not shown) and a groove into which the damper is inserted (not shown).

The push rod 123 is moved in accordance with the movement of the push rod plate 122 to generate the hydraulic pressure.

The push rod 123 may be plural. The push rod 123 may include a first push rod 123a and a second push rod 123b having different center axes.

In addition, the first push rod 123a, the second push rod 123b, the first master cylinder piston 121a, and the second master cylinder piston 121b may be parallel to each other.

Further, the first push rod 123a and the second push rod 123b may be arranged in parallel. Since the first push rod 123a and the second push rod 123b are arranged in parallel, the total length of the master cylinder 120 can be reduced.

The push rod 123 may have an insertion portion 123c formed at one side thereof and a spring 123d inserted therein and a protrusion 123e formed at the other side thereof to protrude from the master cylinder body cover 126 described later.

The protrusion 123e formed in the push rod 123 may be formed with a groove (not shown) for receiving the damper 123f.

The push rod 123 may be provided with a sealing member 123g.

The pedal simulator 124 is compressed by the hydraulic pressure generated by the push rod 123.

The pedal simulator 124 includes a first pedal simulator piston 124a, a first pedal simulator spring 124e, a second pedal simulator piston 124f, a second pedal simulator spring 124i, a filling damper 124j, A damper 124l, and an end plug 124m.

The first pedal simulator piston 124a is moved by the hydraulic pressure generated by the push rod 123.

A first insertion groove 124b for inserting the first pedal simulator spring 124e and a second insertion groove (not shown) for inserting the damper 124c are formed on one side of the first pedal simulator piston 124a .

The first pedal simulator piston 124a may be provided with a sealing member 124d.

The first pedal simulator spring 124e is compressed by the movement of the first pedal simulator piston 124a.

The second pedal simulator piston 124f is moved by compression of the first pedal simulator spring 124e.

 A first insert 124g to be inserted into the first pedal simulator spring 124e is formed at one side of the second pedal simulator piston 124f and a second insert 124g inserted into the second pedal simulator spring 124i 124h may be formed.

The diameters of the first pedal simulator piston 124a and the second pedal simulator piston 124f may be different from each other. In addition, the diameter of the first pedal simulator piston 124a may be smaller than the diameter of the second pedal simulator piston 124f.

The second pedal simulator spring 124i is compressed by the movement of the second pedal simulator piston 124f.

The filling damper 124j is compressed by the movement of the second pedal simulator piston 124f.

A first insertion groove 124k for inserting the end plug 124m and a second insertion groove (not shown) for inserting the plunger damper 124l may be formed at one side of the filling damper 124j.

The plunger damper 124l is compressed by the movement of the second pedal simulator piston 124f.

The end plug 124m is connected to the second pedal simulator spring 124i and seals the pedal simulator chamber 124c.

The end plug 124m may be formed with an insertion portion 124n having one side protruded to be inserted into the filling damper 124j.

The insertion portion 124n formed in the end plug 124m may be formed with an insertion groove (not shown) into which the plunger damper 124l is inserted.

The end plug 124m may be provided with a snap ring 124o.

The master cylinder body 125 includes a master cylinder chamber 125a for accommodating the master cylinder piston 121, the push rod 123 and the pedal simulator 124, a push rod chamber 125b and a pedal simulator chamber 125c .

The master cylinder chamber 125a, the push rod chamber 125b, and the pedal simulator chamber 125c may be parallel to each other.

The push rod chamber 125b may be formed so as to accommodate a plurality of push rods 123 respectively when the push rods 123 are plural.

The push rod chamber 125b may be in parallel.

The push rod chamber 125b and the pedal simulator chamber 125c are connected through a first flow path p1 described later.

The pedal simulator chamber 125c and the hydraulic oil reservoir 130 are connected via a second flow path p2 described later. The second flow path is opened / closed through the N / O valve v described later.

The master cylinder body cover 126 is engaged with the master cylinder body 125.

The master cylinder body cover 126 is formed with a guide groove 126a for guiding the movement of the push rod plate 122. [

The guide grooves 126a of the master cylinder body cover 126 may be formed in plural according to the number of the guide portions 122c of the push rod plate 122. [ The grooves 116b formed in the interference preventing portion 116a of the screw 116 may be formed in plurality according to the number of the guide portions 122c of the push rod plate 122. [

That is, the number of the guide grooves 126a of the master cylinder body cover 126 and the number of the grooves 116b formed in the interference preventing portion 116a of the screw 116 depend on the number of the guide portions 122c of the push rod plate 122 ) Is adjusted.

The master cylinder body cover 126 is formed with holes 126b and 126c so that one side of the first master cylinder piston 121a and the protrusion 123e of the push rod 123 protrude.

The master cylinder body cover 126 may be provided with a push rod plate cover 126d and a snap ring 126e.

Hereinafter, the operation of the electric hydraulic system 100 according to an embodiment of the present invention will be described with reference to FIGS. 5 to 7, divided into the case of normal braking and the case of abnormal braking.

When the driver presses the pedal (not shown) during normal braking, the input rod 112 is moved and the N / O valve (not shown) provided in the second flow path p2 connecting the pedal simulator chamber 125c and the hydraulic oil reservoir 130 (v) is closed. Then, the push rod plate 122 advances and the push rods 123a and 123b advance.

The hydraulic pressure is generated by the advance of the push rods 123a and 123b and the generated hydraulic pressure is transmitted to the pedal simulator chamber 125c through the first flow path p1 connecting the push rod chamber 125b and the pedal simulator chamber 125c .

The first pedal simulator piston 124a and the second pedal simulator piston 124f are advanced by the hydraulic pressure transmitted to the pedal simulator chamber 125c and the second pedal simulator spring 124i, the filling damper 124j, The damper 124l is compressed.

Further, the motor 114 is rotated by sensing a signal corresponding to the leg-power of the pedal (not shown), and the screw 116 is advanced by the rotation of the motor 114. Then, the screw 116 compresses the master cylinder pistons 121a and 121b to transmit the hydraulic pressure to the wheel cylinder (not shown).

When the driver depresses a pedal (not shown) during abnormal braking, the input rod 112 is moved and the N / O valve v installed in the second flow path p2 is kept open. The N / O valve v installed in the second flow path p2 connecting the pedal simulator chamber 125c and the hydraulic oil reservoir 130 is kept open so that the fluid is bypassed to the hydraulic oil reservoir 130, The push rod plate 122 advances without resistance without generating a reaction force due to the generation. The push rod plate 122 directly compresses the master cylinder pistons 121a and 121b to transmit the hydraulic pressure to the wheel cylinder (not shown).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: Electric Hydraulic Device
110: Electric booster
111: Clevis
112: Input Load
113: Control Plunger
114: motor
115: Nuts
116: Screw
120: master cylinder
121: master cylinder piston
122: push rod plate
123: push rod
124: Pedal simulator
125: Master cylinder body
126: Master cylinder body cover
130: Operational fluid storage

Claims (18)

A master cylinder piston moved by the rotational force of the motor;
A push rod plate moved in accordance with the movement of the brake pedal;
A push rod that is moved in accordance with the movement of the push rod plate to generate hydraulic pressure;
A pedal simulator that is compressed by the hydraulic pressure generated by the push rod;
A master cylinder body having a master cylinder chamber in which the master cylinder piston is accommodated, a push rod chamber in which the push rod is accommodated, and a pedal simulator chamber in which the pedal simulator is accommodated; And
And a master cylinder body cover coupled to the master cylinder body to guide movement of the push rod plate. The method according to claim 1,
Wherein the master cylinder chamber, the pushrod chamber, and the pedal simulator chamber are parallel to each other. The method according to claim 1,
Wherein the push rod comprises a plurality of push rods,
And the push rod chamber formed in the master cylinder body is formed in a plurality of such that the plurality of push rods are respectively accommodated. The method according to claim 1,
Wherein the master cylinder piston comprises a first master cylinder piston and a second master cylinder piston having the same central axis,
Wherein the push rod comprises a first push rod and a second push rod having different center axes. 5. The method of claim 4,
Wherein the first master cylinder piston, the second master cylinder piston, the first push rod, and the second push rod are parallel to each other. The method according to claim 1,
Wherein the master cylinder body cover is formed with a guide groove for guiding movement of the push rod plate,
And the push rod plate has a guide portion that is moved along the guide groove. The method according to claim 6,
Wherein the guide groove and the guide portion are formed of a plurality of master cylinders. The method according to claim 1,
The pedal simulator
A first pedal simulator piston moved by hydraulic pressure generated by the push rod;
A first pedal simulator spring that is compressed by movement of the first pedal simulator piston;
A second pedal simulator piston moved by compression of the first pedal simulator spring;
And a second pedal simulator spring which is compressed by the movement of the second pedal simulator piston. 9. The method of claim 8,
Wherein the first pedal simulator piston and the second pedal simulator piston are moved in parallel with the master cylinder piston. 9. The method of claim 8,
Wherein a diameter of the first pedal simulator piston is smaller than a diameter of the second pedal simulator piston and the pedal simulator chamber is stepped to accommodate the first pedal simulator piston and the second pedal simulator piston of different diameters Master cylinder. 9. The method of claim 8,
The pedal simulator
A filling damper which is compressed by movement of the second pedal simulator piston;
A plunger damper compressed by movement of the second pedal simulator piston; And
And an end plug connected to the second pedal simulator spring and sealing the pedal simulator chamber. 12. The method of claim 11,
Wherein the filling damper is formed with an insertion groove, and the plunger damper is inserted into the insertion groove of the filling damper. 12. The method of claim 11,
Wherein the end plug is formed with an insertion portion protruded at one side to be inserted into the filling damper, the insertion portion of the end plug is formed with a first insertion groove into which the plunger damper is inserted,
Wherein the filling damper has a second insertion groove into which the insertion portion of the end plug is inserted and a third insertion groove into which the plunger damper is inserted. An electric booster for sensing a signal according to a pedaling force and transmitting power by electric power, and a master cylinder for receiving hydraulic power output from the electric booster and delivering hydraulic pressure to a wheel cylinder,
The master cylinder
A master cylinder piston moved by the rotational force of the motor;
A push rod plate moved in accordance with the movement of the brake pedal;
A push rod that is moved in accordance with the movement of the push rod plate to generate hydraulic pressure;
A pedal simulator that is compressed by the hydraulic pressure generated by the push rod;
A master cylinder body having a master cylinder chamber in which the master cylinder piston is accommodated, a push rod chamber in which the push rod is accommodated, and a pedal simulator chamber in which the pedal simulator is accommodated; And
And a master cylinder body cover coupled to the master cylinder body to guide movement of the push rod plate. 15. The method of claim 14,
The electric booster
And a screw which is moved by rotation of the motor and has an interference preventing portion for preventing interference with the push rod plate,
And the master cylinder piston is moved by the movement of the screw. 15. The method of claim 14,
The electric booster
And a control plunger moved according to the movement of the brake pedal,
And the pushrod plate is moved by the movement of the control plunger. 17. The method of claim 16,
Wherein the master cylinder body cover is formed with a guide groove for guiding movement of the push rod plate,
The push rod plate
An insertion portion into which the control plunger is inserted; And
And a guide portion that is moved along a guide groove of the master cylinder body cover. 15. The method of claim 14,
Wherein the master cylinder piston comprises a first master cylinder piston and a second master cylinder piston having the same central axis,
The push rod includes a first push rod and a second push rod having different center axes,
Wherein the first master cylinder piston, the second master cylinder piston, the first push rod, and the second push rod are parallel to each other.

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