KR102288468B1 - Hydraulic feeding device - Google Patents

Abstract

Disclosed is a hydraulic pressure supply device capable of improving control performance by buffering a collision between an end of a rack bar and a housing and setting the initial position of the rack bar. The hydraulic pressure supply device according to an embodiment of the present invention is connected to a motor driving unit for generating driving force by sensing the driver's pedal effort, a reduction unit for amplifying the driving force generated from the motor driving unit, and the reduction unit to convert the rotational motion into a linear motion. It includes a pressing unit that converts and a housing that surrounds the pressing unit to protect the pressing unit, and the pressing unit is connected to the reduction unit and rotates by receiving rotational force, and a rack gear circumscribed with the pinion is formed in the longitudinal direction to move linearly, and one end is a cylinder and a rack bar for pressing the piston provided in the , and an adjustment damper for cushioning the collision between the rack bar and the housing is provided between the other end of the rack bar and the housing.

Description

Hydraulic feeding device

The present invention relates to a hydraulic pressure supply device used in an electromagnetic hydraulic brake system, and more particularly, to a hydraulic pressure supply device with improved control performance by buffering a collision between the end of a rack bar and a housing and setting the initial position of the rack bar.

In recent years, as the electronic brake system of vehicles is accelerated, the hydraulic brake system has been converted to an electronic brake system.

Such an electronic brake system includes a plurality of solenoid valves for controlling the brake hydraulic pressure transmitted to the wheel cylinder (hydraulic brake) side mounted on the wheel of the vehicle, a motor and a pump for pumping oil, and a motor and a pump for preventing the reverse flow of oil It includes a plurality of check valves, an electronic control unit (ECU) for controlling driving of a solenoid valve and a motor, and these components are compactly embedded in a hydraulic block made of aluminum.

In addition, when the driver steps on the brake pedal, a hydraulic pressure supply device for supplying pressure to the wheel cylinders by receiving the driver's braking intention as an electrical signal from a pedal displacement sensor sensing the displacement of the brake pedal is provided and used.

The hydraulic pressure supply device is configured to generate a braking pressure by operating a motor according to a pedal force of a brake pedal. At this time, the braking pressure is generated by the pressing member that receives the driving force of the motor through the reducer and converts the rotational force into linear motion to press the piston.

European Patent Registration No. EP 2520473 (published on Nov. 7, 2012) Japanese Patent Laid-Open No. 2010-241314 (published on October 28, 2010)

An embodiment of the present invention is to provide a hydraulic pressure supply device capable of buffering the collision between the rack bar and the housing.

In addition, an embodiment of the present invention is to provide a hydraulic pressure supply device that can easily adjust the initial position of the rack bar.

According to an aspect of the present invention, a motor driving unit for generating driving force by sensing the driver's pedal effort, a speed reducing unit for amplifying the driving force generated from the motor driving unit, and a speed reduction unit connected to the reduction unit to convert rotational motion into linear motion a pressing unit and a housing enclosing the pressing unit to protect the pressing unit, wherein the pressing unit is connected to the decelerating unit and rotates by receiving rotational force, and a rack gear externally contacting the pinion is formed in a longitudinal direction to linearly move at one end. A hydraulic pressure supply device may be provided that includes a rack bar for pressing a piston provided in the cylinder, and an adjustment damper for buffering a collision between the rack bar and the housing between the other end of the rack bar and the housing.

In addition, the control damper is provided with a hydraulic pressure supply device comprising an elastic member that elastically deforms in contact with the other end of the rack bar, and an adjustment member coupled to the elastic member and adjusting a position so that the adjustable damper moves in the longitudinal direction. can be

In addition, the adjusting member may be provided with a screw thread provided on the outer surface to pass through the housing and screwed thereto, and a hydraulic pressure supply device provided with an adjusting unit on one end surface to rotate the adjusting member.

In addition, the control unit may be provided with a hydraulic pressure supply device provided with a polygonal groove on one end surface of the control member.

In addition, the control unit may be provided with a hydraulic pressure supply device that is provided to protrude in a polygonal pillar on one end surface of the control member.

According to an embodiment of the present invention, an adjustment damper is provided between the rack bar and the housing, thereby cushioning the collision between the rack bar and the housing.

By buffering the collision between the rack bar and the housing, noise and vibration generated during control of the hydraulic pressure supply device can be reduced and durability can be improved.

In addition, according to an embodiment of the present invention, an adjustment damper is provided between the rack bar and the housing, so that the origin position of the rack bar can be easily adjusted.

Since the initial position of the rack bar can be easily adjusted, an invalid stroke of the rack bar is reduced when controlling the hydraulic pressure supply device, thereby increasing control efficiency.

1 is a hydraulic circuit diagram illustrating an electronic brake system provided with a hydraulic pressure supply device according to an exemplary embodiment of the present invention.
2 is a view showing a hydraulic pressure supply device according to a preferred embodiment of the present invention.
3 is a perspective view schematically illustrating a state of an adjustable damper according to an embodiment of the present invention.
4 and 5 are cross-sectional views schematically illustrating a state in which an adjustment damper is moved according to an embodiment of the present invention.

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

The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts irrelevant to the description are omitted from the drawings, and in the drawings, the width, length, thickness, etc. of components may be exaggerated for convenience. Like reference numerals refer to like elements throughout.

The present invention relates to a hydraulic pressure supply device, and an electromagnetic brake system provided with the hydraulic pressure supply device will be briefly described with reference to FIG. 1 . At this time, it should be understood that the hydraulic circuit diagram of the electronic brake system shown in FIG. 1 is an example, and the hydraulic pressure supply device according to the present invention is grafted to the electronic brake system having various hydraulic circuits.

As shown in FIG. 1 , the electronic brake system includes a brake pedal 10 operated by a driver during braking, a pedal displacement sensor 11 for detecting the displacement of the brake pedal 10 , and a brake pedal 10 . The master cylinder 20 to which the force is transmitted, the reservoir 30 coupled to the upper part of the master cylinder 20 to store oil, and two hydraulic circuits connected to the two wheels RR, RL, FR, FL, respectively (40A, 40B) and a plurality of solenoid valves (41, 42, 43, 44) for controlling the brake hydraulic pressure transmitted to the wheel cylinder (40) side of the hydraulic brake mounted on the wheel, the master cylinder (20) and The pedal simulator 50 is connected to provide a reaction force of the brake pedal 10, the pressure sensors 45, 46 and the driver arranged in the right place in the flow path constituting the system to measure the pressure generated during braking action A hydraulic pressure supply device 100 that operates by receiving the braking will according to the pedal effort as an electrical signal is provided.

In the electronic brake system having the hydraulic circuit as described above, the hydraulic pressure supply device 100 is provided to supply hydraulic pressure to the wheel cylinder 40 during braking. That is, the hydraulic pressure supply device 100 has a cylinder 110 having a predetermined space formed therein to receive and store oil, and a piston 112 slidable to the cylinder 110 and a spring for elastically supporting the piston 112 ( By providing 114, the piston 112 is pressurized to generate hydraulic pressure. At this time, as the piston 112 is pressed by the driving force of the motor, this hydraulic pressure supply device will be described with reference to FIG. 2 .

2 is a view showing a hydraulic pressure supply device according to a preferred embodiment of the present invention.

Referring to FIG. 2 , the hydraulic pressure supply device 100 includes a motor driving unit 120 that generates driving force by sensing the driver's pedal effort, and a reduction unit 130 and a reduction unit that amplifies the driving force generated by the motor driving unit 120 . It is connected to 130 and includes a pressing unit 140 that converts a rotational motion into a linear motion, and a housing 144 that surrounds the pressing unit 140 to protect it. At this time, the hydraulic supply device 100 has a cylinder 110 having a predetermined space to receive and store oil as described above, and a piston 112 slidable to the cylinder 110 and the piston 112 to the original position. A spring 114 for elastically supporting it to return to is provided. That is, the pressing unit 140 is configured to press the piston 112 by changing the rotational motion into a linear motion.

The motor driving unit 120 is an electric motor that generates rotational force through a signal output from an electronic control unit (not shown), and generates rotational force in forward and reverse directions. At this time, the worm 131 of the reduction unit 130 serves to transmit the rotational force to the worm wheel 132 together with the role of the rotation shaft 121 of the motor driving unit 120 .

The reduction unit 130 serves to amplify the driving force of the motor driving unit 120, and includes a worm shaft 131 provided on the rotation shaft 121 of the motor driving unit 120, and a worm formed on the worm shaft 131. It has a worm wheel 133 engaged with 132).

As shown, the worm shaft 131 is integrally formed with the rotation shaft 121 of the motor driving unit 120 . That is, a worm-integrated motor may be employed. As the rotation shaft 121 of the motor driving unit 120 rotates, the worm shaft 131 rotates, and the worm wheel 133 engaged with the worm 132 receives rotational force to rotate. At this time, the pinion shaft 142 is coupled to the worm wheel 133, and as the worm wheel 133 rotates, the pinion 141, which will be described later, rotates together.

The driving force amplified from the reduction unit 130 is transmitted to the pressing unit 140 . The pressing unit 140 converts the rotational force transmitted from the reduction unit 130 into linear motion to press the piston 112 to generate hydraulic pressure. More specifically, the pressing unit 140 includes a pinion 141 having a pinion shaft 142 formed at its center, and a rack bar 143 engaged with the pinion 141 to linearly move according to the rotation of the pinion 141 . .

As described above, the pinion 141 has a pinion shaft 142 installed on the worm wheel 133 to rotate together with the worm wheel 133 . That is, the pinion shaft 142 is installed at the center of the worm wheel 133 . The pinion shaft 142 is disposed to be perpendicular to the worm shaft 131 .

The rack bar 143 has a predetermined length, and one end is provided to be in contact with the piston 112 . In the rack bar 143 , the rack gear 143a in contact with the pinion 141 is formed in the longitudinal direction and moves linearly according to the rotation direction of the pinion 141 to press the piston 112 . The gear ratio between the pinion 141 and the rack gear 143a is varied in the longitudinal direction of the rack bar 143 .

More specifically, the spacing between the gear teeth of the rack gear 143a formed on the rack bar 143 may be formed such that the spacing gradually decreases. For example, the distance between the gear teeth may be reduced from the end of the rack bar 143 in contact with the piston 112 toward the opposite side. That is, the rack bar 143 is configured to gradually increase the gear ratio when the piston 112 is pressed by the pinion 141 . The section of the gear ratio variable according to the gear teeth formed in the rack bar 143 may be largely divided into an initial low pressure section S1 for pressing the piston 112 and a high pressure section S2 at the end. Accordingly, the gear ratio of the rack gear 143a has the first gear ratio in the initial low-pressure section S1 in which the rack bar 143 is moved to press the piston 112, and the high-pressure section at the end of pressing the piston 112 In (S2), it is possible to have a second gear ratio higher than the first gear ratio.

Here, the low pressure section (S1) and the high pressure section (S2) can be distinguished through the pressure provided to the wheel cylinders in the conventionally used brake system, and can also be classified based on an arbitrarily designated pressure and can be controlled by sensing it. . Accordingly, the rack bar 143 is moved by the pinion 141 to increase the movement distance in the initial low-pressure section (S1) for pressing the piston 112, and to shorten the movement distance in the high-pressure section (S2) at the end of the rack. The gear tooth gap of the gear 143a is gradually reduced.

On the other hand, the interval of the gear teeth formed in the low pressure section (S1) of the rack bar 143 is made to be the same, and the interval of the gear teeth formed in the high pressure section (S2) is made to be the same, from the low pressure section (S1) to the high pressure section (S2) When the gear ratio is changed, the gear ratio may be changed, but it is preferable that the gear tooth spacing of the rack gear 143a is gradually reduced so that the gear ratio is changed more smoothly. Accordingly, in the variable section between the low pressure section S1 and the high pressure section S2 , the gear ratio may be continuously varied from the first gear ratio to the second gear ratio.

On the other hand, the rack bar 143 reduces the occurrence of an invalid stroke of the rack bar 143 during control by setting the origin by contacting the end of the rack bar 143 with the inner surface of the housing 144 when the first control is performed or when the control is finished. Therefore, since the end of the rack bar 143 and the inside of the housing 144 are in direct contact with each other, unnecessary noise and vibration and loss of durability of the product are lost.

A detailed description of the configuration and function of the control damper 150 will be described later with reference to FIGS. 3 to 5 .

3 is a perspective view schematically showing a state of the adjustable damper 150 according to an embodiment of the present invention, and FIGS. 4 and 5 are schematic views of the state in which the adjustable damper 150 is moved according to an embodiment of the present invention. It is a cross-sectional view shown by

3 to 5, the control damper 150 according to an embodiment of the present invention includes an elastic member 152 that is elastically deformed in contact with the rack bar 143 and the end, and the control damper 150. It includes an adjustment member 151 for adjusting the position.

The elastic member 152 is made of a material having an elastic force so as to be elastically deformable to cushion the collision between the rack bar 143 and the housing 144 . Although not limited to a specific material, it may be provided, for example, of a rubber material. The elastic modulus of the elastic member 152 may be variously selected according to the selection of the hydraulic pressure supply device designer.

The elastic member 152 according to an embodiment of the present invention is provided in a cylindrical shape, but is not limited thereto, and may be provided to have various shapes and sizes, such as a square column.

The adjustment member 151 is provided in combination with the elastic member 152 or provided integrally. Since the adjustment member 151 must be able to be rotated or press-fitted with a force given from the outside, it should have a hardness that is not easily deformed by an external force. For example, it may be a metal such as iron.

The adjustment member 151 is provided with a screw thread on the outer surface and passes through the housing 144 to be screwed with the housing 144, the screw portion 151a, and the adjustment member 151 is provided as a groove in one end surface of the outer side by an external force. Includes a control unit (151b) for rotating the.

The screw portion 151a is provided with a general screw thread. By penetrating the housing 144 , a thread corresponding to the screw portion 151a may be provided on the inner surface of the housing 144 . The screw portion 151a is screwed with the inner surface of the housing 144 through the hole.

The adjusting part 151b is provided as a polygonal groove in one end surface of the outer side of the adjusting member 151 . Although the adjustment part 151b according to an embodiment of the present invention is provided in a hexagonal shape, this is only an example and may be provided in various shapes such as a square.

The adjusting unit 151b may rotate the adjusting member 151 by inserting a polygonal rod spanner corresponding to the polygonal shape.

Although the adjusting part 151b according to the embodiment of the present invention is provided as a groove, it may be provided in various ways, such as protruding into a polygonal pole and rotating by a polygonal wrench corresponding to its shape.

As described above, the adjusting member 151 is rotated by a spanner of a shape corresponding to the shape of the adjusting unit 151b and moves forward or backward in the longitudinal direction to easily and precisely adjust the position where the rack bar 143 starts but ends. .

In addition, the present invention has been described with reference to one embodiment shown in the accompanying drawings, which is only exemplary, and that various modifications and equivalent other embodiments are possible therefrom by those of ordinary skill in the art. point can be understood. Accordingly, the true scope of the invention should be defined only by the appended claims.

100: hydraulic supply 110: cylinder
120: motor driving unit 130: reduction unit
140: pressing part 141: pinion
143: rack bar 144: housing
150: adjustment damper 151: adjustment member
152: elastic member

Claims (5)

A motor driving unit that senses the driver's pedal effort to generate driving force, a reduction unit that amplifies the driving force generated by the motor driving unit, a pressing unit connected to the reduction unit to convert rotational motion into linear motion, and protecting the pressing unit It includes a housing that wraps so as to
The pressing unit includes a pinion connected to the reduction unit and rotating by receiving rotational force, and a rack gear in which a rack gear circumscribed with the pinion is formed in the longitudinal direction to linearly move, and one end of the rack bar to press the piston provided in the cylinder;
A hydraulic pressure supply device provided with an adjustment damper for buffering a collision between the rack bar and the housing between the other end of the rack bar and the housing. According to claim 1,
The control damper includes an elastic member elastically deformed in contact with the other end of the rack bar, and an adjustment member coupled to the elastic member and adjusting a position of the adjustable damper to move in the longitudinal direction. 3. The method of claim 2,
The adjustment member is provided with a screw thread on the outer surface of the hydraulic pressure supply device is provided with a screw portion screwed through the housing, and the adjustment portion is provided on one end surface to rotate the adjustment member. 4. The method of claim 3,
The control unit is a hydraulic pressure supply device provided with a polygonal groove on one end surface of the control member. 4. The method of claim 3,
The control unit is a hydraulic pressure supply device provided to protrude in a polygonal column on one end surface of the control member.

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