Pulsation damping device of hydraulic brake system
Disclosed herein is a pulsation damping device of a hydraulic brake system. The pulsation damping device of a hydraulic brake system which attenuates a pressure pulsation of brake oil discharged from a pump comprise a sleeve inserted into a bore which communicates with an inport into which the brake oil is introduced and an outport through which the brake oil is discharged, wherein one end of the sleeve is open and the other end is closed, a damping member accommodated in the sleeve and hollowed to form a damping space therein, and a stopper member configured to block one open end of the bore and coupled to an opening of the sleeve.
1. A pulsation damping device of a hydraulic brake system which attenuates a pressure pulsation of brake oil discharged from a pump, the device comprising:
a sleeve inserted into a bore which communicates with an inport into which the brake oil is introduced and an outport through which the brake oil is discharged, wherein one end of the sleeve is open and the other end is closed;
a damping member accommodated in the sleeve and hollowed to form a damping space therein; and
a stopper member configured to block one open end of the bore and coupled to an opening of the sleeve,
wherein:
the stopper member includes a second coupling groove provided in an outer surface thereof to be coupled with the sleeve; and
the sleeve includes a hook portion which enters the second coupling groove and is deformed to be caught at the second coupling groove.
2. The device of claim 1 , wherein the sleeve includes a shoulder portion which extends from the opening, and the stopper member includes a step corresponding to the shoulder portion.
3. The device of claim 2 , wherein:
the bore includes a lower bore in which a lower portion of the sleeve is accommodated and an upper bore in which the shoulder portion of the sleeve is accommodated;
inner diameter of the lower bore is provided to be smaller than inner diameter of the upper bore; and
a space through which the brake oil is introduced and discharged is formed between the sleeve and the upper bore in a region in which the inport and the outport are provided.
4. The device of claim 1 , wherein:
a concave-convex portion is formed on an outer circumferential surface of the damping member in a longitudinal direction; and
an auxiliary damping space is formed between the sleeve and the concave-convex portion.
5. The device of claim 4 , wherein the stopper member includes a first coupling portion which is coupled to the damping member for sealing the damping space and a second coupling portion which is coupled to the sleeve for sealing between the damping space and the auxiliary damping space.
6. The device of claim 5 , wherein the damping member is positioned under the second coupling portion.
7. The device of claim 1 , wherein the stopper member includes:
an insertion portion inserted into and coupled to a hollow portion of the damping member; and
a cap portion integrally formed with the insertion portion and configured to block the one open end of the bore.
8. The device of claim 7 , wherein:
at least one first coupling groove or first coupling protrusion is formed in an outer circumferential surface of the insertion portion; and
a coupling protrusion which fits the first coupling groove or a coupling groove which couples with the first coupling protrusion is formed on inner circumferential surface of the damping member into which the insertion portion is inserted.
9. The device of claim 1 , wherein the damping member is formed of a rubber material to be elastically deformed.
10. The device of claim 1 , wherein a flow path by which the inport and the outport are in communication with the damping space is formed in the stopper member.
11. The device of claim 10 , wherein a space through which the brake oil is introduced and discharged is formed between the stopper member and the bore in a region in which the flow path passing through the stopper member is formed.