Piston pump for brake

Patent metadata

Field	Value
Publication number	US-11111914-B2
Application number	US-201916598255-A
Country	US
Kind code	B2
Filing date	Oct 10, 2019
Priority date	Oct 11, 2018
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A piston pump for a brake may include: a piston moved by rotation of a motor cam, and movably installed in a piston housing; a sleeve installed in a shape to cover an end of the piston, and having an inner space for storing brake oil moved from the piston; an airtight mounting part coupled to the end of the piston, and blocking brake oil from moving between the piston and the sleeve; a return spring having both sides contacted with the sleeve and the airtight mounting part, and elastically pressing the airtight mounting part toward the motor cam; an inlet ball pressed toward the piston by an inlet spring, and installed in contact with the airtight mounting part; and a check valve installed at a position facing the sleeve, and discharging brake oil to the outside of the sleeve when the pressure of the brake oil rises.

First claim

What is claimed is:

1. A piston pump for a brake, comprising:
a piston moved by rotation of a motor cam, and installed in a piston housing so as to linearly move;
a sleeve installed in a shape to cover an end of the piston, and having an inner space for storing brake oil moved from the piston;
an airtight mounting part coupled to the end of the piston, and blocking the brake oil from moving between the piston and the sleeve;
a return spring having two axial ends contacted with the sleeve and the airtight mounting part, and elastically pressing the airtight mounting part toward the motor cam;
an inlet ball pressed toward the piston by an inlet spring installed in the airtight mounting part, and installed in contact with the airtight mounting part; and
a check valve installed at a position facing the sleeve, and configured to discharge the brake oil in the sleeve to the outside of the sleeve when the pressure of the brake oil rises,
wherein the piston comprises:
a piston body having an inner passage through which the brake oil is moved; and
an insertion protrusion extended from the piston body toward the airtight mounting part, and inserted into the airtight mounting part, and

wherein the airtight mounting part has a groove into which the insertion protrusion of the piston is inserted, wherein due to the insertion of the insertion protrusion, a width of the groove before the insertion protrusion is inserted into the groove is smaller than the width after the insertion protrusion is inserted into the groove.

2. The piston pump of claim 1 , wherein the airtight mounting part comprises:
a mounting body supporting the inlet spring;
an inner member extended from the mounting body so as to be positioned in the insertion protrusion, and contacted with the inlet ball; and
an outer member extended from the mounting body so as to be positioned between the sleeve and the insertion protrusion, and blocking movement of the brake oil.

3. The piston pump of claim 2 , wherein the airtight mounting part is made of a flexible material.

4. The piston pump of claim 2 , wherein the inner member is connected to an end of the mounting body while forming a ring-shaped belt.

5. The piston pump of claim 2 , wherein the insertion protrusion has an inclined surface formed on the inside thereof, facing the inner member, and the inner member is pushed by the inclined surface so as to be pressed against the inlet ball.

6. The piston pump of claim 1 , wherein the check valve comprises:
a cap member installed in a shape to cover an end of the sleeve;
an outlet spring having one side inserted into the cap member; and
an outlet ball installed at a position facing a discharge hole formed in the sleeve, and elastically supported by the outlet spring.

7. The piston pump of claim 6 , further comprising an orifice flow path positioned between the cap member and the sleeve, and guiding the brake oil discharged to the outside of the sleeve through the discharge hole.

8. A piston pump for a brake, comprising:
a piston moved by rotation of a motor cam, and installed in a piston housing so as to linearly move;
a sleeve installed in a shape to cover an end of the piston, and having an inner space for storing brake oil moved from the piston;
an airtight mounting part coupled to the end of the piston, and blocking the brake oil from moving between the piston and the sleeve;
a return spring having two axial ends contacted with the sleeve and the airtight mounting part, and elastically pressing the airtight mounting part toward the motor cam; and
an inlet ball pressed toward the piston by an inlet spring installed in the airtight mounting part, and installed in contact with the airtight mounting part,
wherein the piston comprises:
a piston body having an inner passage through which the brake oil is moved; and
an insertion protrusion extended from the piston body toward the airtight mounting part, and inserted into the airtight mounting part, and

wherein the airtight mounting part has a groove into which the insertion protrusion of the piston is inserted, wherein due to the insertion of the insertion protrusion, a width of the groove before the insertion protrusion is inserted into the groove is smaller than the width after the insertion protrusion is inserted into the groove.

9. The piston pump of claim 8 , wherein the airtight mounting part comprises:
a mounting body supporting the inlet spring;
an inner member extended from the mounting body so as to be positioned in the insertion protrusion, and contacted with the inlet ball; and
an outer member extended from the mounting body so as to be positioned between the sleeve and the insertion protrusion, and blocking movement of the brake oil.

Assignees

• Hyundai Mobis Co Ltd

Inventors

• Choi Young Chang

Classifications

• B60T11/236

  Piston sealing arrangements · CPC title

• F16D2125/06

  Pistons · CPC title

• F04B9/042

  the means being cams · CPC title

• F04B53/1002 Primary

  Ball valves · CPC title

• B60T2270/10

  ABS control systems · CPC title