Pump unit for clutch actuation

Patent metadata

Field	Value
Publication number	US-11719239-B2
Application number	US-202117480742-A
Country	US
Kind code	B2
Filing date	Sep 21, 2021
Priority date	Oct 14, 2020
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

A pump unit for clutch actuation, having a high-pressure port for clutch actuation, a low-pressure port for a lubricant flow, a single drive motor and a dual pump, which is driven by the drive motor and has a high-pressure outlet, which is connected to the high-pressure port with a high-pressure line, and a low-pressure outlet, which is connected to the low-pressure port with a low-pressure line, wherein a prefilling line which leads from the low-pressure line to the high-pressure line is provided.

First claim

The invention claimed is:

1. A pump unit for clutch actuation, having a high-pressure port for clutch actuation, a low-pressure port for a lubricant flow, a single drive motor and a dual pump, which is driven by the drive motor and has a high-pressure outlet, which is connected to the high-pressure port with a high-pressure line, and a low-pressure outlet, which is connected to the low-pressure port with a low-pressure line, wherein a prefilling line which leads from the low-pressure line to the high-pressure line is provided,
wherein a check valve which blocks flow in a flow direction from the high-pressure line to the low-pressure line is provided in the prefilling line,
wherein the drive motor is an electric motor which can be driven in two directions of rotation and a control means controls the rotational speed of the drive motor, and in a normal operating state when the check valve is closed, the rotational speed of the drive motor is a rated rotational speed, while for prefilling purposes when the check valve is open, the rotational speed of the drive motor is temporarily increased.

2. The pump unit according to claim 1 , wherein a bypass line for the check valve is provided, wherein a throttle or diaphragm is arranged in the bypass line.

3. The pump unit according to claim 1 , wherein a throttle or diaphragm is provided downstream of a juncture with the prefilling line in the low-pressure line.

4. The pump unit according to claim 1 , wherein a control valve is provided in the low-pressure line downstream of a juncture with the prefilling line.

5. The pump unit according to claim 1 , wherein a control valve is provided in the prefilling line.

6. The pump unit according to claim 1 , wherein a pressure-controlled switching valve, which makes it possible to connect the high-pressure line directly to a reservoir, is provided in the high-pressure line.

7. The pump unit according to claim 1 , wherein a pressure-controlled switching valve, which makes it possible to switch between a throttled throughflow and a free throughflow, is provided in the low-pressure line downstream of a juncture with the prefilling line.

8. The pump unit according to claim 1 , wherein the dual pump is a rotary vane pump,
wherein one low-pressure chamber is delimited between each pair of adjacent rotary vanes and one high-pressure chamber is delimited between a rotor and a face side of each of the rotary vanes received in the rotor.

Assignees

• Fte Automotive Gmbh

Inventors

• Sperber Christian
• Heubner Wilhelm
• Gegner Patrick
• Lehnert Alexander
• Sauerteig Frank
• Wuechner Benjamin

Classifications

• F04C2/344 Primary

  with vanes reciprocating with respect to the inner member · CPC title

• F15B11/17

  using two or more pumps · CPC title

• F16H57/0435

  Pressure control for supplying lubricant; Circuits or valves therefor · CPC title

• F16H57/0441

  Arrangements of pumps · CPC title

• F16H61/0025

  Supply of control fluid; Pumps therefor · CPC title