Abstract:
Disclosed herein is a high pressure accumulator of a brake system capable of attenuating pressure pulsation of oil discharged from a pump. The present invention is directed to a high pressure accumulator a brake system in which a damping chamber disposed to attenuate pressure pulsation is optionally partitioned into a plurality of layers to change characteristics of a flow of brake oil so that pressure pulsation can be efficiently reduced. Therefore, it is an aspect of the present invention to provide a high pressure accumulator of a brake system in which an orifice part is integrally formed so that a processing time for installing an orifice separately and an assembling time therefor can be reduced.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of Korean Patent Application No. 2014-0082319, filed on Jul. 2, 2014 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
     BACKGROUND 
     1. Field 
     Embodiments of the present invention relate to a high pressure accumulator, and more particularly, to a high pressure accumulator of a brake system capable of attenuating pressure pulsation of oil discharged from a pump. 
     2. Description of the Related Art 
     In general, in an electronic brake system, in order to control brake hydraulic pressure transmitted toward a brake of a vehicle, a plurality of solenoid valves disposed on a modulator block, a low pressure accumulator and a high pressure accumulator that temporarily store oil, and an electronic control unit (ECU) having a pump disposed between the low pressure accumulator and the high pressure accumulator to pump the oil stored in the low pressure accumulator and a motor for driving the pump are provided, the electronic brake system includes the ECU controlling components used to electrically operate these elements. 
     Such an electronic brake system has been used by employing various structures in which the high pressure accumulator having a predetermined damping space is disposed to reduce pressure pulsation generated as liquid pressure of brake oil discharged from the pump is formed at a high pressure and an orifice part is disposed in an outport discharged through the high pressure accumulator. For example, Korean Unexamined Patent Application Publication No. 10-2001-0046429 discloses a structure for reducing pressure pulsation by separately disposing an elastic member and an orifice in a high pressure accumulator. Also, Korean Unexamined Patent Application Publication No. 10-2010-0135236 discloses a configuration in which a pulsation attenuation capsule having an elastic force is disposed in a high pressure accumulator to reduce pressure pulsation and an orifice is separately disposed in the high pressure accumulator. That is, referring to the disclosed literatures, an orifice part is obligatorily mounted in an outport discharged through the high pressure accumulator to attenuate pressure pulsation. 
     However, since the orifice should be separately assembled, as mentioned above, an additionally processing time for installing the orifice and an assembling time therefor increase, and of course, cost increases. 
     In addition, pressure pulsation attenuation caused by elastic deformation is induced by installing an elastic member formed of a spring or a rubber material in the high pressure accumulator. Thus, there is a problem in that the function may be lowered by lowered durability of components when they are used for a long time and a pressure pulsation attenuation effect is limited. 
     SUMMARY 
     Therefore, it is an aspect of the present invention to provide a high pressure accumulator of a brake system in which an orifice part is integrally formed so that a processing time for installing an orifice separately and an assembling time therefor can be reduced. 
     It is another aspect of the present invention to provide a high pressure accumulator of a brake system in which a damping chamber disposed to attenuate pressure pulsation is optionally partitioned into a plurality of layers to change characteristics of a flow of brake oil so that pressure pulsation can be efficiently reduced. 
     Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. 
     In accordance with one aspect of the present invention, a high pressure accumulator of a brake system disposed on a modulator block to reduce pressure pulsation of brake oil pressed by driving of a pump and pumped, the high pressure accumulator includes: a closing member that closes one end of a bore having one opened end and is in communication with an inport through which the brake oil is introduced and an outport through which the brake oil is discharged; and a damping housing that is installed in the bore and has a damping chamber formed therein in communication with the inport and the outport, wherein an orifice part may be formed integrally with the damping housing in a portion in which the brake oil is discharged through the outport, and a damping member may be installed in the damping housing and may partition the damping chamber into a plurality of layers so that the partitioned plurality of layers may be in communication with each other, and the damping member may include a body part having one opened side to partition the damping chamber into a plurality of layers and a connection hole formed in a bottom surface of the body part in communication with the adjacent damping chamber partitioned by the body part, and an inclined part may be formed on the bottom surface of the body part so that the brake oil may easily flow into the adjacent damping chamber, and the connection hole may be formed in distal ends of the inclined part. 
     The orifice part may include an insertion part inserted into and coupled to the outport and an orifice formed in the insertion part so that the damping chamber and the outport are in communication with each other. 
     A stepped part for supporting the damping member may be formed in the damping housing. 
     A plurality of damping members may be provided, the plurality of damping member being stacked and disposed in series. 
     An introduction hole that is in communication with the inport may be formed in the damping member disposed in a position corresponding to the inport. 
     The plurality of damping chambers, each of which is partitioned into a plurality of layers by the damping members, may be optionally formed to have the same heights according to heights of the damping members or may be optionally formed to have different heights. 
     The plurality of damping members may have diameters at which they correspond to each other, and may be installed in the damping housing, and one end of each of the damping housing and the damping member may be pressed in and coupled to the closing member. 
     A coupling jaw corresponding to an inner diameter of each of the damping members may be formed at an inside of the closing member. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  is an assembling cross-sectional view illustrating a state in which a high pressure accumulator of a brake system is assembled, in accordance with an embodiment of the present invention; 
         FIG. 2  is a cross-sectional view illustrating a state in which the high pressure accumulator of the brake system illustrated in  FIG. 1  is assembled to a bore in a modulator block; 
         FIG. 3  is a cross-sectional view illustrating a high pressure accumulator of a brake system in accordance with another embodiment of the present invention; and 
         FIG. 4  is a view illustrating a flow of brake oil, pressure pulsation of which is attenuated through the high pressure accumulator of the brake system illustrated in  FIG. 3 . 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The following embodiment is proposed to sufficiently convey the spirit of the invention to one of ordinary skill in the art. The invention is not limited by the proposed embodiment but may be embodied in different shapes. In the drawings, for clarity, illustration of unrelated parts to description is omitted, and for understanding, sizes of components may be slightly exaggerated. 
       FIG. 1  is an assembling cross-sectional view illustrating a state in which a high pressure accumulator of a brake system is assembled, in accordance with an embodiment of the present invention, and  FIG. 2  is a cross-sectional view illustrating a state in which the high pressure accumulator of the brake system illustrated in  FIG. 1  is assembled to a bore in a modulator block. 
     Referring to the drawings, a high pressure accumulator  100  of a brake system according to an embodiment of the present invention is installed on a modulator block  10  of an electronic brake system (not shown) and attenuates pressure pulsation. In this case, the electronic brake system (not shown) is a device in which in order to control brake hydraulic pressure transmitted toward a brake of a vehicle, a plurality of flow paths are formed in the modulator block  10 , a solenoid valve, a low pressure and a high pressure accumulators, a pump, and a motor are installed, and thus are electronically controlled. Such an electronic brake system is a well-known technology and thus, a detailed description thereof will be omitted. 
     The high pressure accumulator  100  according to an embodiment of the present invention is installed in a bore  11  formed in the modulator block  10  in communication with an inport  12  through which high-pressure brake oil discharged from the pump is introduced and an outport  13  through which the introduced brake oil is discharged. In more detail, the high pressure accumulator  100  includes a closing member  110  that closes one end of the bore  11  having one opened end formed in a cylindrical shape and a damping housing  120  that is installed in the bore  11  and has a damping chamber  121  formed therein in communication with the inport  12  and the outport  13 . 
     The closing member  110  is installed to close the opened end of the bore  11  so that an inside of the bore  11  may be formed by the damping chamber  121  together with the damping housing  120 . A coupling protrusion  114  through which the closing member  110  may be coupled to a damping member  140  that will be described later is formed at an inside of the closing member  110 . Hereinafter, the coupling protrusion  114  will be described again. 
     The damping housing  120  is installed in the bore  11 , has the opened end in the cylindrical shape, and has the damping chamber  121  formed therein. In the damping housing  120 , an inlet  122  is formed in a position corresponding to the inport  12  so that the brake oil may be introduced through the inport  12 , and an orifice part  130  is formed integrally with the damping housing  120  in a position corresponding to the outport  13  so that the introduced brake oil may be discharged toward the outport  13 . 
     The orifice part  130  includes an insertion part  133  inserted into and coupled to the outport  13  and an orifice  131  formed in the insertion part  133  so that the damping chamber  121  and the outport  13  are in communication with each other. As the orifice part  130  is formed integrally with the damping housing  120 , an orifice does not need to be separately installed compared to the related art so that a processing time and an assembling time may be reduced. 
     Meanwhile, the damping member  140  is installed within the damping housing  120  so that the damping chamber  121  may be partitioned into a plurality of layers and the partitioned plurality of layers may be in communication with each other. In this case, a stepped part  124  for stably supporting the damping member  140  is formed in an inner side surface of the damping housing  120 . 
     The damping member  140  includes a body part  141  having one opened side to partition the damping chamber  121  into a plurality of layers and a connection hole  143  formed in a bottom surface of the body part  141  in communication with the adjacent damping chamber  121  partitioned by the body part  141 . That is, as illustrated in the drawings, the damping member  140  is disposed in the damping housing  120  to partition the damping chamber  121  into two layers so that pressure pulsation of the brake oil introduced under high pressure may be attenuated in two layers and a pressure pulsation attenuation effect may be improved. 
     Also, an inclined part  144  is formed on a bottom surface of the damping member  140  so that the brake oil may easily flow into the adjacent damping chamber  121 . The inclined part  144  is formed to be inclined in a direction through which the brake oil flows, and the connection hole  143  is formed in distal ends of the inclined part  144 . Thus, the brake oil flows toward the outport  13  by the inclined part  14  so that, although the damping chamber  121  is partitioned into the plurality of layers, the brake oil may flow smoothly. 
     The damping member  140  is installed in the damping housing  120  and is pressed in and coupled to the closing member  110  together with the damping housing  120 . As described above, the damping member  140  is pressed in and coupled to the coupling protrusion  114  of the closing member  110 . Thus, the coupling protrusion  114  is formed to have a diameter corresponding to an inner diameter of the damping member  140 . In this case, the damping member  140  is pressed in and coupled to the closing member  110  together with the damping housing  120 . However, the present invention is not limited thereto, and the damping housing  120  may also be directly pressed in and coupled to the closing member  110 . When the damping member  140  is pressed in and coupled to the closing member  110  together with the damping housing  120 , an introduction hole  142  is formed in a position of the damping member  140  corresponding to the inlet  122  formed in the damping housing  120  so that the brake oil may be introduced into the damping housing  120  through the inport  12 . If the damping housing  120  is directly pressed in and coupled to the closing member  110 , the damping member  140  is installed to be located under the inlet  122  formed in the damping housing  120 . 
     In the above-described high pressure accumulator  100  of the brake system, the orifice part  130  is integrally formed so that a processing time for installing an orifice separately and an assembling time therefor may be reduced. Also, the damping chamber  121  is partitioned into a plurality of layers so that pressure pulsation may efficiently be reduced. Also, the damping chamber  121  is formed of a material having rigidity, for example, steel or a plastic material. Thus, although the damping chamber  121  is used for a long term, durability of the damping chamber  121  is not lowered, and as the function of partitioning the damping chamber  121  into a plurality of layers is permanently maintained, a continuous pressure pulsation attenuation function may be performed. 
     Meanwhile, the high pressure accumulator  100  of the brake system according to an embodiment of the present invention includes one damping member  140  to partition the damping housing  120  into two layers. However, the present invention is not limited thereto, and two or more damping members may be disposed to optionally increase the number of layers of the damping housing  120 . For example,  FIG. 3  illustrates a high pressure accumulator  100 ′ having two or more damping members  140 ′ of a brake system according to another embodiment of the present invention. Here, like reference numerals that are the same as those of the previous drawings are used for like elements having the same functions. 
     The high pressure accumulator  100 ′ of the brake system according to the current embodiment includes a damping housing  120  that is installed in a bore  11  in a modulator block  10  and has an orifice part  130  integrally formed in the damping housing  120 , a closing member  110  that closes one end of the bore  11 , and at least two or more damping members  140 ′ that are installed in the damping housing  120  and partition the damping chamber  121  into a plurality of layers. Three damping members  140 ′ are provided, as illustrated in the drawings, and are stacked and disposed in series. 
     In this case, the plurality of damping members  140 ′ have diameters at which they correspond to each other, and the damping member  140 ′ disposed at the lowermost end is supported by the stepped part  124  formed in the damping housing  120 , and the damping member  140 ′ disposed at the uppermost end is pressed in and coupled to the closing member  110 . Also, an introduction hole  142 ′ that is in communication with the inport  12  is formed in the damping member  140 ′ disposed in the position corresponding to the inport  12 . 
     Each damping member  140 ′ includes a body part  141 ′, an inclined part  144 ′ formed on a bottom surface of the body part  141 ′ to be inclined, and a connection hole  143 ′ formed in the inclined part  144 ′. Each damping member  140 ′ is installed in the damping housing  120  so that the damping chamber  121  partitioned into four layers by the damping member  140 ′ are in communication with the connection hole  143 ′. In this case, the damping chamber  121  partitioned into a plurality of layers by the damping member  140 ′ may be optionally formed to have the same heights according to heights of the damping members  140 ′ or may be optionally formed to have different heights. That is, the heights of the damping members  140 ′ may differ so that heights of the partitioned layers of the damping chamber  121  may be changed and thus characteristics of a fluid flow may be changed. Thus, as illustrated in  FIG. 4 , brake oil pumped by a pump (not shown) is introduced into the damping chamber  121  through the inport  12  so that pressure pulsation may be attenuated through the damping chamber  121  that are primarily partitioned into four layers and may be secondarily reduced through the orifice part  130  formed integrally with the damping housing  120  and thus the brake oil is discharged through the outport  13 . Thus, pressure pulsation and noise generated by the high-pressure brake oil may efficiently be reduced. 
     The above-described high pressure accumulator  100 ′ according to the current embodiment may be used to reduce pressure pulsation using various structures in which the damping chamber  121  is partitioned into four layers to reduce pressure pulsation of the brake oil. However, the number of layers of the damping chamber  121  may be optionally increased/decreased according to a capacity of a chamber of the brake system and the size of the bore  11  may be changed. 
     As described above, in a high pressure accumulator of a brake system according to the one or more of the embodiments of the present invention, an orifice part for reducing pressure pulsation is formed integrally with a damping housing so that a process of installing an orifice separately can be removed and thus an assembling time and a processing time can be reduced compared to the related art. 
     In addition, a damping chamber formed in the high pressure accumulator is optionally partitioned into a plurality of layers according to a capacity of a chamber so that pressure pulsation can efficiently be reduced. In this case, a damping member that partitions the damping chamber into a plurality of layers is formed of a material having rigidity so that, although the damping member is used for a long term, a problem relating to lowering of the function of the damping member caused by lowered durability can be solved. 
     Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.