GB2443068A - Mounting Electric Motor for Power Assistance for a Steering System - Google Patents

Mounting Electric Motor for Power Assistance for a Steering System Download PDF

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Publication number
GB2443068A
GB2443068A GB0719795A GB0719795A GB2443068A GB 2443068 A GB2443068 A GB 2443068A GB 0719795 A GB0719795 A GB 0719795A GB 0719795 A GB0719795 A GB 0719795A GB 2443068 A GB2443068 A GB 2443068A
Authority
GB
United Kingdom
Prior art keywords
housing
electric motor
electric unit
electric
motor according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0719795A
Other versions
GB0719795D0 (en
Inventor
Michael Juschke
Gerhard Jandl
Michael Ochs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch Automotive Steering GmbH
Original Assignee
ZF Lenksysteme GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZF Lenksysteme GmbH filed Critical ZF Lenksysteme GmbH
Publication of GB0719795D0 publication Critical patent/GB0719795D0/en
Publication of GB2443068A publication Critical patent/GB2443068A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/06—Cast metal casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/26—Means for adjusting casings relative to their supports
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

The invention relates to an electric motor assembly, in particular for power assistance for a steering system of a motor vehicle, with an electric unit 2 comprising at least a stator 3, a rotor, a rotor shaft 4 and a bearing for the rotor shaft. The electric motor assembly also comprises a housing 8, which may be caste with the steering assembly, into which the electric unit can be inserted. At least one O-ring 7, which extends around the electric unit, is provided to axially orient and support the electric unit (electric motor) in the housing. Endcaps 5 surround the stator and support the bearings. The unit carries a fixing plate 10 with lugs extending beyond the stator secured to housing 8 by screws 11 to prevent torque twisting the electric unit.

Description

Electric Motor for Power Assistance for a Steering System
Description
The invention relates to an electric motor, in particular for power assistance for a steering system of a motor vehicle.
Many different forms of electric motors and their possible uses are known from the general prior art. One field of use of electric motors lies in using these for power assistance for a steering system of a motor vehicle. In this respect it is known to use electric motors both in electrohydraulic and in electromechanical power steering systems.
In electromechanical power steering systems the steering assistance is implemented by means of an electric motor. In this respect the electric motor generally acts directly or by way of an interconnected transmission (e.g. a belt transmission) on a rack for deflecting the vehicle wheels. In this case the electric motor only works when the driver requires corresponding steering assistance. The electromechanical power steering system can be implemented entirely without hydraulic components, which results in a reduction of the costs and of the numerous variations of steering components as well as an improved life cycle assessment. In addition, the steering control can easily be combined with other vehicle systems, e.g. an ESP, or extended by assistance functions, e.g. for automatic parking and track-keeping.
As steering systems are mass-produced products, it is particularly important for the electric motor to be easy to mount, entail low costs and require little space. For this reason electric motors which arc used for power assistance for a steering system of a motor vehicle generally comprise an electric unit which can be inserted into a housing which is independent of the latter. The electric unit (which itself does not comprise a housing) essentially consists of known components such as a stator, a rotor, a rotor shaft and a bearing for the rotor shaft. The housing into which the electric unit is inserted may on the one hand be an integral housing or a steering housing with a cast-On housing for an electric motor or an external housing, e.g. an extruded section of aluminium. A formation of the housing such that this is cast onto a steering housing reduces the costs and the space which is required. The electric unit, which is also called an electric motor cartridge, can be used individually and flexibly by being separated from the housing.
However, in order to separate the electric unit of the electric motor from the housing, it must be possible for the electric unit to be easily and inexpensively axially oriented and supported in the separate housing. For this purpose it is known from the prior art to use dowel pins to secure the electric unit against twisting and axially orient it in the housing. However the dowel pins require complex and expensive machining.
It is also known from practice to secure the electric unit against twisting which respect to the housing by means of sheet-metal straps and axially orient it in the housing by way of spiral springs (e.g. worm springs). Although the sheet-metal straps enable the electric unit to be quickly and inexpensively secured against twisting, the spiral springs give rise to mounting problems, as these push together and become warped. This results in increased pressing-in forces. Moreover, the electric unit has to comprise grooves for accommodating the springs, although the machining of these is expensive and complex.
A further disadvantage of the known prior art lies in the fact that the electric motor is not sealed towards the transmission or towards the rotor shaft.
It is therefore an object of the present invention to provide an electric motor, in particular for power assistance for a steering system of a motor vehicle, which substantially alleviates or overcomes the disadvantages of the prior art mentioned above.
Accordingly, the present invention provides an electric motor, in particular for power assistance for a steering system of a motor vehicle, with an electric unit comprising at least a stator, a rotor, a rotor shaft and a bearing for the rotor shaft, and a housing into which the electric unit can be inserted, characterised in that at least one 0-ring, which extends around the electric unit, is provided to axially orient and support the electric unit in the housing.
In a preferred cmbodimcnt, hvo 0-rings are provided, and prefcrably, the 0-rings arc mounted at the electric unit prior to insertion into the housing.
Preferably, the stator encompasses the rotor, and pot-shaped terminating elements are pressed onto the front-side ends of the stator.
/0 A respective 0-ring preferably extends around a circumferential wall part of a pot-shaped terminating element.
In a preferred embodiment, the electric unit can be connected to the housing in an anti-twist manner by way of a fixing element in the region of at least one of its front /5 sides and, the fixing element preferably comprises at least one projection which projects radially beyond the front side of the electric unit and can be connected to the housing.
The fixing element is preferably formed as a sheet-metal disc which is connected to a front side of the electric unit, wherein the sheet-metal disc may comprise at least one, preferably three projection(s) which is/arc formed as (a) sheet-metal strap(s) and project(s) radially beyond the front side of the electric unit.
The housing is preferably cast onto a steering housing of a steering system of a motor vehicle.
An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Fig. I is a side view of the electric motor according to the invention; and Fig. 2 is a front-side view onto the electric motor according to the invention according to the arrow direction II of Fig. I. As electric motors are sufficiently known from the prior art, their basic mode of operation is not discussed in detail in the following.
Referring now to the drawings, the electric motor 1, which is represented in the figures, is particularly suitable for power assistance for a steering system (not represented) of a motor vehicle. For this purpose the electric motor I comprises an electric unit 2, which essentially consists of a stator 3, a rotor, a rotor shaft 4 and a bearing for the rotor shaft 4. The rotor, which is surrounded by the stator 3, and the bearing for the rotor shaft 4 are not represented for reasons of clarity and as their mode of operation and structure are sufficiently known from the prior art. The electric unit 2 which is represented in the embodiment additionally comprises two pot-shaped terminating elements 5 which arc in each case pressed onto an (opposite) end of the stator 3. Here one terminating element 5 comprises in a known manner a central bore through which the rotor shaft 4 extends and leads to a driving pinion 6 of a transmission, which is not represented in detail. The other terminating element 5 comprises, likewise in a known manner, the bearing for the rotor shaft 4.
The terminating elements 5 in each case comprise a circumferential wall part 5a as well as a bottom part Sb.
A respective 0-ring 7 is provided, this extending around a circumferential wall part 5a of one of the pot-shaped terminating elements 5 or being mounted accordingly.
Two 0-rings 7 are therefore provided in the exemplary embodiment. The 0-rings 7 may preferably be formed from rubber.
The electric unit 2, which is inherently (without a housing) stable, is introduced or inserted into a housing 8 in order to mount the electric motor. The 0-rings orient the electric unit 2 axially relative to the interior space of the housing 8.
As can be seen from Fig. I and Fig. 2, a fixing element 9 is fitted to one front side of the electric unit 2. In the embodiment this is a punched sheet which is welded onto the bottom part 5b of a terminating element 5. The punched sheet 9 can basically be formed from any desired material. The punched sheet 9 comprises three projections in the form of sheet-metal straps 10 which project radially beyond the front side of the electric unit 2. The projecting sheet-metal straps 10 are in this case uscd for connection to the housing 8, in the embodiment to a front side of the housing 8. In the embodiment the sheet-metal straps 10 are connected to the housing 8 by means of a screw 11, a rivet or generally a fixing member.
The sheet-metal straps 10 may preferably be (at least approximately) evenly distributed, so that the occurring torques can be reliably absorbed.
In the embodiment the housing 8 is a housing which is cast onto a steering housing of a steering system of a motor vehicle. However the invention is not restricted to this, the housing 8 may also, for example, be an aluminium housing (e.g. an extruded section) or similar.
The above-described embodiment is one example only of the present invention within the scope of the appended claims. It will be apparent that the invention provides an electric motor in which the at least one 0-ring enables the electric unit to be mounted in the housing in an advantageous manner without increased pressing-in forces being required. In addition, reliable axial orientation and support of the electric unit in the housing is achieved through the at least one 0-ring. It is in this respect of advantage for two 0-rings to be provided. It has in this case proved to be particularly suitable to dispose the 0-rings at the respective opposite ends of the electric unit (extending around the outer circumference thereof). In addition to the axial orientation of the electric unit in the housing, the 0-rings also seal the electric unit outwardly, in particular also towards the transmission or towards the rotor shaft.
The use of dowel pins or springs, e.g. of spiral springs, as was necessary according to the prior art, is rendered unnecessary by the solution according to the invention.
The electric motor according to the invention can therefore be mounted in a particularly easier, quicker and less expensive manner. For this purpose it is simply necessary to insert the electric unit (stator, rotor, rotor shaft and a bearing for the rotor shaft) into the provided housing. It is in this case possible for the 0-rings to be mounted at the electric unit (extending around the circumference thereof) prior to insertion into the housing.
It is of advantage for the stator to encompass the rotor and for pot-shaped terminating elements to be pressed onto the front-side ends of the stator. The outer circumference of the electric unit is formed by the stator in the annular portion between the two pot-shaped terminating elements which arc applied at the front sides. The pot-shaped terminating elements form the front sides of the electric unit and seal this in this region. It is in this respect of advantage for a respective 0-ring to extend around a circumferential wall part of a pot-shaped terminating element.
The stator, which is exposed between the pot-shaped terminating elements, is therefore sealed outwardly.
In order to support the torque which occurs during operation of the electric motor, it has proved to be of advantage to connect the electric unit to the housing in an anti-twist manner by way of a fixing element in the region of at least one of its front sides. A great many different possibilities are conceivable for this purpose. It has proved to be particularly suitable for the fixing element to comprise at least one projection which projects radially beyond the front side of the electric unit and can be connected to the housing. This can be achieved, for example, by forming the fixing element as a sheet-metal disc (e.g. as a punched sheet) which is connected to the front side of the electric unit, the sheet-metal disc comprising at least one, preferably three projection(s) which is/are formed as (a) sheet-metal strap(s) and project(s) radially beyond the front side of the electric unit. The sheet-metal straps can preferably be connected to the housing at the front side of the housing, for example by means of screws, rivets or other fixing elements. The sheet-metal disc can be fitted to the front side of the electric unit or the bottom of the pot-shaped terminating element in various ways, preferably welded, spot-welded or stuck thereto.
A particularly advantageous use of the electric motor according to the invention is obtained by casting the housing into which the electric unit is introduced onto a steering housing of a steering system of a motor vehicle. Easy mounting on the one hand and packing or space advantages on the other can be obtained through this.

Claims (10)

  1. Claims 1. An electric motor, in particular for power assistance for a
    steering system of a motor vehicle, with an electric unit comprising at least a stator, a rotor, a rotor shaft and a bearing for the rotor shaft, and a housing into which the electric unit can be inserted, wherein at least one 0-ring, which extends around the electric unit, is provided to axially orient and support the electric unit in the housing.
  2. 2. An electric motor according to claim 1, wherein two 0-rings are provided.
  3. 3. An electric motor according to claim I or 2, wherein the 0-rings arc mounted at the electric unit prior to insertion into the housing.
  4. 4. An electric motor according to any of claims 1 -3, wherein the stator encompasses the rotor, and pot-shaped terminating elements are pressed onto the front-side ends of the stator.
  5. 5. An electric motor according to claim 4, wherein a respective 0-ring extends around a circumferential wall part of a pot-shaped terminating element.
  6. 6. An electric motor according to any of claims I -5, wherein the electric unit can be connected to the housing in an anti-twist manner by way of a fixing element in the region of at least one of its front sides.
  7. 7. An electric motor according to claim 6, wherein the fixing element comprises at least one projection which projects radially beyond the front side of the electric unit and can be connected to the housing.
  8. 8. An electric motor according to claim 6 or 7, wherein the fixing element is formed as a sheet-metal disc which is connected to a front side of the electric unit and wherein the sheet-metal disc comprises at least one, preferably three projection(s) which is/are formed as (a) sheet-metal strap(s) and project(s) radially beyond the front side of the electric unit.
  9. 9. An electric motor according to any one of claims I -8, wherein the housing is cast onto a steering housing of a steering system of a motor vehicle.
  10. 10. An electric motor substantially as hereinbefore described with reference to the accompanying drawings.
GB0719795A 2006-10-13 2007-10-10 Mounting Electric Motor for Power Assistance for a Steering System Withdrawn GB2443068A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006048526A DE102006048526A1 (en) 2006-10-13 2006-10-13 Electric motor for power assistance of a steering system

Publications (2)

Publication Number Publication Date
GB0719795D0 GB0719795D0 (en) 2007-11-21
GB2443068A true GB2443068A (en) 2008-04-23

Family

ID=38787935

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0719795A Withdrawn GB2443068A (en) 2006-10-13 2007-10-10 Mounting Electric Motor for Power Assistance for a Steering System

Country Status (2)

Country Link
DE (1) DE102006048526A1 (en)
GB (1) GB2443068A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016189245A1 (en) * 2015-05-27 2016-12-01 Valeo Equipements Electriques Moteur Rotating electrical machine equipped with a stator retaining member
FR3036874A1 (en) * 2015-05-27 2016-12-02 Valeo Equip Electr Moteur ROTATING ELECTRIC MACHINE HAVING A STATOR HOLDER

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009001942A1 (en) * 2009-03-27 2010-09-30 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Housing for sealed electrical machine utilized e.g. as motor in steering system of motor vehicle, has base forming axial catch for bearing receptacle with bearing shield, where housing is manufactured by impact extrusion process
DE102009027872A1 (en) 2009-07-21 2011-01-27 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Arrangement for the acoustic decoupling of a stator of an electric motor
CN101728880B (en) * 2010-02-02 2012-08-29 常州市华特电机电器厂有限公司 Low-noise rotating shaft
DE102015207548A1 (en) * 2015-04-24 2016-10-27 Robert Bosch Gmbh Motor housing for an electric motor, in particular for an electric steering motor
DE102020209305A1 (en) 2020-07-23 2022-01-27 Thyssenkrupp Ag Housing for an electric motor of an electric power steering system for a motor vehicle
DE102022214013A1 (en) 2022-12-20 2024-06-20 Robert Bosch Gesellschaft mit beschränkter Haftung Connection plate for an electrical machine with a flexible decoupling element

Citations (5)

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GB433850A (en) * 1934-10-11 1935-08-21 Baumgarten G M B H Electric vacuum cleaner
GB1434226A (en) * 1973-11-02 1976-05-05 Roberts S A Pumps
GB2293695A (en) * 1994-09-30 1996-04-03 Aisin Seiki Vibration damping in switched reluctance motors
US20040150274A1 (en) * 2001-05-25 2004-08-05 Jurgen Schule Electric motor in particular for a steering system in a vehicle
WO2005063598A2 (en) * 2003-12-23 2005-07-14 Siemens Aktiengesellschaft Rotary support comprising an elastic joining device for mounting electric machines into tubes

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DE604260C (en) * 1934-10-17 Mauz & Pfeiffer Elastic motor mount for easily movable vacuum cleaners of horizontal design
SE341214B (en) * 1969-12-12 1971-12-20 Electrolux Ab
DE4039267A1 (en) * 1990-12-08 1992-06-11 Bosch Gmbh Robert Electric servo-steering device for road vehicle - with manual pushbutton switch allowing operation of servo-motor independent of steering wheel rotation
DE4324912C2 (en) * 1993-07-24 1995-11-16 Buehler Gmbh Nachf Geb Actuator, in particular for heating, ventilation or air conditioning flaps in motor vehicles
DE4342949A1 (en) * 1993-12-16 1995-06-22 Bosch Gmbh Robert Arrangement for clearance-free fixing of electric machine into casing
JP4128889B2 (en) * 2003-02-28 2008-07-30 株式会社日立製作所 Blower motor support structure
DE10334608B3 (en) * 2003-07-29 2005-03-17 Robert Bosch Gmbh Device for receiving an electric motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB433850A (en) * 1934-10-11 1935-08-21 Baumgarten G M B H Electric vacuum cleaner
GB1434226A (en) * 1973-11-02 1976-05-05 Roberts S A Pumps
GB2293695A (en) * 1994-09-30 1996-04-03 Aisin Seiki Vibration damping in switched reluctance motors
US20040150274A1 (en) * 2001-05-25 2004-08-05 Jurgen Schule Electric motor in particular for a steering system in a vehicle
WO2005063598A2 (en) * 2003-12-23 2005-07-14 Siemens Aktiengesellschaft Rotary support comprising an elastic joining device for mounting electric machines into tubes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016189245A1 (en) * 2015-05-27 2016-12-01 Valeo Equipements Electriques Moteur Rotating electrical machine equipped with a stator retaining member
FR3036874A1 (en) * 2015-05-27 2016-12-02 Valeo Equip Electr Moteur ROTATING ELECTRIC MACHINE HAVING A STATOR HOLDER

Also Published As

Publication number Publication date
DE102006048526A1 (en) 2008-04-17
GB0719795D0 (en) 2007-11-21

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