Hydraulic unit for anti-slip regulated braking systems

• US 20040046446A1
• Filed: 05/21/2003
• Published: 03/11/2004
• Est. Priority Date: 11/21/2000
• Status: Active Grant

• Current Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Original Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Inventors: Otto, Albrecht, Dinkel, Dieter
• Granted Patent: US 6,877,822 B2
• Time in Patent Office: Days
• US Class Current: 303/119.3
• CPC Class Codes: B60T 17/222 by filling or bleeding of hydraulic systems
• CPC Class Codes: B60T 8/368 combined with other mechanical components, e.g. pump units, master cylinders
• CPC Class Codes: Y10S 303/10 Valve block integrating pump, valves, solenoid, accumulator

Abstract

The present invention relates to a hydraulic unit whose inlet valves are arranged in valve accommodating bores (2C, 2D) of a first valve row (X) which is spatially separated by means of a pump accommodating bore (5) from a second valve row (Y) accommodating the outlet valves, wherein several valve accommodating bores (2E, 2F) of a third valve row (Z) remote from the pump accommodating bore (5) open directly between the second valve row (Y) and the braking pressure generator ports (B1, B2) into a first housing surface (A1) of the accommodating member (4), and wherein an electric change-over valve closed in its basic position is provided in at least one valve accommodating bore (2E) of the third valve row (Z) for the hydraulic communication between at least one braking pressure generator port (B1 or B2) and a suction-side connection of the pump accommodating bore (2), the hydraulic communication between said change-over valve and the pump accommodating bore (5) being established by way of a portion of a suction channel (6), the length thereof being determined by the distance between the pump accommodating bore (5) and the third valve row (Z).

Claims

1. Hydraulic unit for slip-controlled braking systems including an accommodating member accommodating inlet and outlet valves in several valve accommodating bores of a first and a second valve row, said valves opening into a first housing surface of the accommodating member that is disposed at right angles to a second housing surface into which several braking pressure generator ports open, with a pump accommodating bore arranged in the accommodating member and being directed transversely to the direction the valve accommodating bores open into the accommodating member, wherein the valve accommodating bores for the outlet valves are arranged in the second valve row that is in direct adjacency to the pump accommodating bore, with a motor accommodating bore arranged in the accommodating member and being directed vertically to the pump accommodating bore, with an accumulator accommodating bore opening into the accommodating member, with several pressure fluid channels that connect the accommodating bores for valve, pump and accumulator and enable a hydraulic communication between a braking pressure generator and several wheel brakes,

characterized in that the inlet valves are arranged in the valve accommodating bores (2C, 2D) of the first valve row (X) which is spatially separated from the second valve row (Y) accommodating the outlet valves by means the pump accommodating bore (5), in that several valve accommodating bores (2E, 2F) of a third valve row (Z) remote from the pump accommodating bore (5) open directly between the second valve row (Y) and the braking pressure generator ports (B1, B2) into the first housing surface (A1) of the accommodating member (4), and in that for the hydraulic communication between at least one braking pressure generator port (B1 or B2) and a suction-side connection of the pump accommodating bore (2) there is provision of an electric change-over valve closed in its basic position in at least one valve accommodating bore (2E) of the third valve row (Z), the hydraulic communication between said change-over valve and the pump accommodating bore (5) being established by way of a portion of a suction channel (6), the length thereof being determined by the distance between the pump accommodating bore (5) and the third valve row (Z).

2. Hydraulic unit as claimed in claim 1,

characterized in that a pressure-side outlet of the pump accommodating bore (5) opens into a noise damping chamber (10) that is arranged adjacent to the first valve row (X) in the accommodating member (4) remote from the second and third valve row (Y, Z).

3. Hydraulic unit as claimed in claim 1,

characterized in that the valve accommodating bore (2E) of the third valve row (Z) accommodating the electric change-over valve is designed as a blind-end bore which extends from the direction of the first housing surface (A1) up to the bottom (3) of the blind-end bore, which is crossed by the suction channel (6) and is tangent thereto in the area of bottom (3), and in that one of the braking pressure generator ports (B1 or B2) opens at a vertical distance from the bottom (3) into the valve accommodating bore (2E) of the third valve row (Z) in such a manner that depending on the valve switch position of the electric change-over valve associated with the valve accommodating bore (2), there is a direct pressure fluid connection of the suction channel (6) between the braking pressure generator port (B1 or B2) and the pump accommodating bore (5) by way of the valve accommodating bore (2E).

4. Hydraulic unit as claimed in claim 1,

characterized in that the valve accommodating bore (2E) provided for the electric change-over valve is configured as a blind-end bore that extends from the direction of the first housing surface (A1) to the bottom (3) of the blind-end bore, and in that in the area of the bottom (3) the suction channel (6) is continued linearly until the braking pressure generator port (B1 or B2).

5. Hydraulic unit as claimed in claim 4,

characterized in that a first and a fourth portion (6A, 6D) of the suction channel (6) is produced by a drilling operation directed into the second housing surface (A2), said portion extending up to the pump accommodating bore (5), in that a second portion of the suction channel (6B) is produced by another drilling operation that is directed into a third housing surface (A3) disposed opposite the first housing surface (A1), said second portion opening into the first portion of suction channel (6A) produced by the first drilling operation, and in that the second channel portion (6B) of the suction channel (6) is interposed directly between the valve accommodating bore (2E) of the electric change-over valve and the braking pressure generator port (B1, B2).

6. Hydraulic unit as claimed in claim 5,

characterized in that a third channel portion (6C) that opens from the direction of the second housing surface (A2) into the valve accommodating bore (2E) of the electric change-over valve in parallel to the braking pressure generator port (B1 or B2) is introduced into the valve accommodating bore (2E) of the electric change-over valve, said third channel portion (6C) extending from there to the pump accommodating bore (5) by way of a fourth channel portion (6D) that is continued coaxially to the first portion (6A) of the first suction channel (6).

7. Hydraulic unit as claimed in any one of the preceding claims,

characterized in that a closure member (16) is mounted into the housing channel opening as a transverse bore from the direction of the second housing surface (A2) in order to prevent a short-circuit current between the first and the fourth portion (6A, 6D) of the suction channel (6).

8. Hydraulic unit as claimed in claim 7,

characterized in that the closure member (16) is positioned in the portion of the transverse bore disposed between the valve accommodating bore (2E) and the second channel portion (6B) of the suction channel.

9. Hydraulic unit as claimed in claim 8,

characterized in that the closure member (16) is designed as a ball that is press-fitted into the channel bore from the direction of the braking pressure generator port (B1 or B2).