E135ges – Compact PSU
Pressure Supply Unit (PSU)
Bearing arrangement in an axial drive — internal rotor motor with ball screw drive. 3 independent inventions · 4 granted patents · EP · US · CN · KR
| Applicant | IPGATE AG, Churerstrasse 160B, 8808 Pfäffikon (CH) |
| Inventors | Heinz Leiber, Dr. Thomas Leiber, Valentin Unterfrauner |
| Priority / Filing Date | April 20, 2012 (DE102012103506) January 25, 2013 (DE102013100741) |
| PCT Application | PCT/EP2013/057609 |
| Technology | Compact bearing arrangement for internal rotor motor with ball screw drive (bearing arrangement in an axial drive) |
| Innovations | 3 independent inventions (device) |
Compact Bearing Arrangement
for PSU Actuators
Patent family E135ges covers a compact drive device for electrohydraulic brake actuators in which all bearings are arranged on one side of the radial housing — enabling shorter overall length, higher rigidity, and reduced tolerance chains.
The E135ges patent family describes a compact drive device with an internal rotor motor and ball screw drive (KGT), in which the bearings for the rotor and drive components are arranged on one side of the radial housing part or on components connected to it. The core innovation lies in a significantly reduced overall length combined with a rigid, precise, and highly resilient bearing arrangement — a fundamental prerequisite for compact electrohydraulic brake actuators (pressure supply units, PSU) in modern Brake-by-Wire systems.
The E135ges patent family comprises four granted patents in the jurisdictions EP (with validation in DE), US, CN, and KR, as well as the underlying PCT application. The invention forms the technological basis for the drive of the pressure supply unit (PSU) of second-generation integrated brake systems (IBS2), both for single-stroke piston and double-stroke piston systems.
Development History
Development of the drive device in accordance with E135ges began in 2012 with the aim of creating a particularly compact pressure supply unit (PSU) for the second generation of the integrated brake system (IBS Gen2).
This concept was first implemented as part of a joint development project with a German Tier 1 supplier, initially as a B1 sample with single-stroke piston pressure supply, and later also transferred to double-stroke piston systems in collaboration with an Asian Tier 1 supplier. The double-stroke piston enabled a further reduction in overall length and opened up the possibility of both parallel and vertical arrangement of the master brake cylinder and pressure supply with a very narrow overall width.
Three Independent Inventions
Each invention addresses a distinct aspect of the single-sided bearing arrangement and is independently claimed across all four jurisdictions.
Categories, Descriptions & Keywords
The EP claim structure (claims 1, 2, 15) is used as the reference. Corresponding claim numbers differ in US (C1, C20, C29) and CN (A1, A41, A43).
| Invention | Cat. | Description | Keyword |
|---|---|---|---|
| E135ges A1 EP A1 · US C1 · CN A1 · KR A1 |
Device | Drive device with internal rotor motor and ball screw drive, in which all bearings for the rotor and nut are arranged on the radial housing part or on a component firmly connected to it. Single-sided support with short, rigid force flow; axial forces from the ball screw nut are transferred directly to the motor housing. Enables compact design, high rigidity, and robust bearings for brake and steering actuators. | Housing bearing |
| E135ges A2 EP A2 · US C20 · CN A41 |
Device | Drive device with internal rotor motor and recirculating ball gear, in which the bearing(s) for the rotor and rotating gear component(s) is/are located directly on a component connected to or integrated into the nut. Reduced tolerance chain between motor and gearbox, improved efficiency and positioning accuracy, minimized bending moments and tilting of rotating components. | Nut integration |
| E135ges A15 EP A15 · US C29 · CN A43 |
Device | Drive device with internal rotor motor and ball screw drive, in which at least two rotor bearings are arranged on the radial or axial motor housing section; the ball screw nut is connected directly to the rotor. Precise rotor centering, minimized tilting and vibrations, short overall length due to close structural coupling of motor and gearbox. Particularly suitable for highly dynamic and low-noise applications. | Rotor centering |
Jurisdictions & Status
All members of the E135ges patent family as of February 2026. All five rights are granted.
| File No. | Country | Status | Type | Registration No. | Filed | Grant No. | Granted |
|---|---|---|---|---|---|---|---|
| E135GESWOEP | EP | Granted | Patent | 13719757.0 | April 11, 2013 | EP2852517B1 | May 15, 2019 |
| E135GESWOEPDE | DE | Granted | Patent (via EP) | 13719757.0 | Apr. 11, 2013 | 502013012841.5 | May 15, 2019 |
| E135GESWOUS | US | Granted | Patent | 14/395,619 | April 11, 2013 | US10,250,098 B2 | Apr. 2, 2019 |
| E135GESWOCN | CN | Granted | Patent | 201380020962.7 | April 11, 2013 | CN104321231B | Sep. 21, 2018 |
| E135GESWOKR | KR | Granted | Patent | 10-2014-7032624 | April 11, 2013 | KR102020530B1 | Sep. 4, 2019 |
