GB2110318A - Freewheel clutch for starter motor - Google Patents
Freewheel clutch for starter motor Download PDFInfo
- Publication number
- GB2110318A GB2110318A GB08233400A GB8233400A GB2110318A GB 2110318 A GB2110318 A GB 2110318A GB 08233400 A GB08233400 A GB 08233400A GB 8233400 A GB8233400 A GB 8233400A GB 2110318 A GB2110318 A GB 2110318A
- Authority
- GB
- United Kingdom
- Prior art keywords
- roller
- clutch device
- plate
- hub
- fin
- 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.)
- Granted
Links
- 239000007858 starting material Substances 0.000 title 1
- 239000002184 metal Substances 0.000 claims abstract description 13
- 238000005452 bending Methods 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D41/00—Freewheels or freewheel clutches
- F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
- F16D41/064—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls
- F16D41/066—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls all members having the same size and only one of the two surfaces being cylindrical
- F16D41/067—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls all members having the same size and only one of the two surfaces being cylindrical and the members being distributed by a separate cage encircling the axis of rotation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
- F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
- F02N15/022—Gearing between starting-engines and started engines; Engagement or disengagement thereof the starter comprising an intermediate clutch
- F02N15/023—Gearing between starting-engines and started engines; Engagement or disengagement thereof the starter comprising an intermediate clutch of the overrunning type
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Operated Clutches (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
Abstract
There is provided a free wheel clutch device for a starting motor, of the type comprising a hub (4), providing a generally cup-shaped housing (4'), mounted on a splined portion of the rotational shaft for the starting motor and a toothed pinion slidably mounted on said shaft for engagement with a ring gear and wherein said hub and pinion can be coupled and uncoupled by means of a plurality of axial rollers (10) and roller presser springs (11) carried by a plate- like member non-rotatably received within the cup-shaped housing of the hub, characterized in that said plate- like member comprises a metal plate (9) having around its periphery a plurality of axial expansions or fins (12) each of which provides on one side retaining means (15) for a roller, and on the opposite side supporting means (16) for a roller presser spring. <IMAGE>
Description
SPECIFICATION
Free wheel clutch device for the starting motor of an internal combustion engine
This invention relates to a free wheel clutch device for an electric starting motor of an internal combustion engine, such as is conventionally used in motor vehicles.
More particularly, the invention relates to such a free wheel clutch device of the type having a hub, providing a generally cup-shaped housing, mounted on a splined portion of the rotating shaft of the starting motor, and a toothed pinion slidably mounted on said shaft and capable of meshing with a ring gear of the heat engine, and wherein said hub and pinion can be coupled by means of a plurality of axial rollers and roller springs for acting on the rollers carried by at least one plate-like member clamped against rotation on the bottom of said cup-shaped housing.
As is well known, such clutch devices perform the function of enabling, on starting, the heat engine to be driven by the electric starting motor through coupling of the pinion with the ring gear, and then the disconnecting or disengaging said parts once the heat engine has started.
However, during the starting step, when the speed of rotation of the heat engine exceeds that of the electric motor, that is during "overrunning", then it will be the pinion that is driven by the ring gear as long as the ignition lock key is maintained at the starting position. During this step, the pinion disconnects from the hub driven by the electric motor so as therefore to disconnect the heat engine and electric motor. This operation is made possible owing to the provision of the axial rollers which are arranged between the pinion and the hub under the action of the roller presser springs.
In conventional clutch devices of this type, the rollers and roller presser springs are carried by two axially coupled plates or discs of plastics material, between which both the rollers and roller presser springs are interposed.
Obviously, this arrangement has some disadvantages. First, the provision of the two discs or plates necessitates that the cup-shaped housing be of sufficient size in the axial direction to accommodate the discs, which of course have to be of sufficient thickness for the intended purpose. Moreover, the discs must be formed of suitable plastics material capable of withstanding the high temperatures being developed therebetween and the rollers during overrunning.
Additionally, the total cost of the device is quite high, both because of the need to provide two such discs, and also because of the assembling time required in the production line.
It is another object of the invention to provide a pre-assembled unit comprising said roller carrier plate, rollers and roller pressure springs, whereby the assembly of these components in the clutch is facilitated.
More particularly, the present invention in one aspect provides a free wheel clutch device for a starting motor of a heat engine, of the type comprising a hub, providing a generally cupshaped housing, mounted on a splined portion of the rotational shaft for the starting motor and a toothed pinion slidably mounted on said shaft for engagement with a ring gear of the heat engine, and wherein said hub and pinion can be coupled and uncoupled by means of a plurality of axial rollers and roller presser springs carried by a platelike member non-rotatably received within the cup-shaped housing of the tub, characterized in that said plate-like member comprises a metal plate having around its periphery a plurality of axial expansions or fins each of which provides on one side retaining means for a roller, and on the opposite side supporting means for a roller presser spring, and the rollers and roller presser springs being assembled so that each roller and a roller presser spring therefor are located between said retaining means of one fin and said supporting means of an adjacent fin.
As will become apparent hereafter, a clutch device of the present invention can be simply and economically manufactured and assembled.
The present invention also provides a preassembled roller-spring unit for a free-wheel clutch device of the type described, comprising a metal plate having a contour shaped to conform with the contour of the generally cup-shaped housing of the hub, so as to be non-rotatably receivable within said housing, the metal plate having around its periphery a plurality of axial expansions or fins each of which provides on one side retaining means for a roller and on the opposite side supporting means for a roller presser spring, and a roller retained by solid retaining means of each said fin under the action of a roller presser spring supported on said supporting means of an adjacent fin.
The invention will now be described further with reference to the accompanyingjdrawings, in which:
Figure 1 is a part sectional view showing the starting motor-electromagnet assembly on the drive side to illustrate one embodiment of the clutch device according to the invention;
Figure 2 is an enlarged sectional view taken along line Il-Il of the clutch device shown in
Figure 1;
Figure 3 is an enlarged plan view showing a first step in the formation of the roller carrier plate used in Figures 1 and 2;
Figure 4 is a plan view showing the plate of
Figure 3 upon completion;
Figure 5 is a side view of the plate shown in
Figure 4;
Figure 6 is a plan view of the plate shown in
Figure 4, assembled with rollers and roller presser springs, prior to assembling of this unit in the cupshaped housing of the hub of the clutch device;;
Figure 7 is a side view of Figure 6; and
Figure 8 is an enlarged exploded view showing the free wheel clutch device of Figure 1.
As conventional, the starting unit shown in
Figure 1 includes a starting motor 1, for a motor vehicle, comprising a D.C. electric motor, and a dual winding electromagnet 2, which is energized by the vehicle driver through operation of the ignition lock key.
At an intermediate portion provided with a helical groove, the motor shaft 3 has mounted thereon a hub 4 which provides a generally cupshaped housing 4'. At the drive end of the shaft 3 there is mounted a toothed pinion 5 for engagement with a ring gear 6 of the internal combustion engine or heat engine (not shown).
Due to said helical groove or spline, hub 4 is
capable of axially moving on shaft 3 under control
of a lever 7, pivoted about a fixed fulcrum 0 and
connected at one end to the hub and at the other
end to the movable core of electromagnet 2.
Pinion 5 is freely mounted on shaft 3 and in
addition to be axially driven by hub 4, it can be
also rotatably coupled to said member.
Rotating coupling occurs between the toothless
portion 5' of the pinion and cup-shaped housing
4' of the hub and is provided by means of a free
wheel clutch device according to the present
invention.
As more clearly shown in Figures 2, 6, 7 and 8,
such a device includes a metal plate 9, a plurality
of axial rollers 10 and a corresponding plurality of
cylindrical roller presser springs 11.
The plate 9 has an outer profile 9'
corresponding to the inner spiral profile 4" of the
cup-shaped housing 4', in which it is received to
lie against the bottom of said housing. Such
profiles define axial lands allowing axial
introduction of the plate into the housing, but
inhibiting any relative rotation therebetween.
According to the invention, said metal plate 9
peripherally has means for retaining the axial
rollers 10 and supporting the roller presser springs
11. In the illustrated embodiment, such means
comprise a plurality of axial expansions or fins 12,
each of which provided on one side with a plurality
of roller retaining extensions, and on the opposite
side with a supporting extension for a roller
presser spring.
In the simple embodiment of the invention
which is illustrated, the roller retaining extensions
are three in number, and namely two side
extensions 1 3 and 14 arranged on the fin plane,
and an intermediate third extension 1 5 located on
a cross plane to the fin passing inwardly of plate 9.
Thus, said three extensions 13, 14 and 1 5 define
an angular seat, which when the clutch device is
assembled, accommodate therein a roller which is
held under the thrust of its associated roller
presser spring 11.
To this end, said spring 1 1 is mounted on an
extension 1 6 on fin 12 on the side opposite to that
carrying said retaining extensions 13, 14 and 15,
but in the same plane of the fin and extensions 13
and 14.
The fin plane, but particularly the plane of the
supporting extension 16, is oriented to pass
centrally through the angular roller housing seat,
in order to assure that, when inserted on extension
16, the spring 11 is facing the roller to exert a
thrust action thereon.
Instead of the single spring-supporting ex+ension 1 6 on each fin 1 2 as shown, there could, for example, be two such spring-supporting extensions, for correspondingly supporting two roller presser springs.
The carrier plate 9 which is illustrated can be made by a very simple and economical manufacturing process from sheet metal. In the preferred manufacturing process, a piece of sheet metal is subjected to a shearing operation to provide a planar plate of the configuration shown in Figure 3, that is a perforated plate with outer profile 9', and peripherally extending fin elements 1 2a having extensions 1 3a, 1 4a, 1 5a and 1 6a.
Then, a folding or bending operation is carried out on fin elements 1 2a along lines X-X, and on extensions 1 5a along lines Y-Y, to provide the completed plate shown in Figures 4 and 5.
Essentially, both fin elements 1 2a and extensions 1 spa are bent through an angle of substantially 900, so that at the end of the operation said fins
12 are on a plane substantially at right angles to the plane of the sheared plate, and extensions 1 5 are on a plane substantially at right angles to the fin plane.
The shearing and bending operations may be concurrently or successively carried out.
Two general methods may be followed in assembling the plate 9, rollers 10 and springs 11 in the cup-shaped housing 4' of the hub: first, the pre-assembled unit shown in Figure 6 can be provided, such a unit comprising said plate 9, and said rollers 10 and springs 11 already assembled on the plate, which is then inserted as a unit into the housing 4'; or the various components 9, 10 and 11 can be separately assembled in the cupshaped housing 4', as shown in Figure 8.
In the unit of Figure 6, it should be pointed out that, due to the thrust of springs 1 the rollers 10 will bear against the angular seat provided by extensions 13, 14 and 1 5. On the other hand, when this unit is mounted between the housing 4' and pinion 5' the rollers become separated from the angular seat (see Figure 2), owing to the spiral
profiles 9' and 4", respectively, of said plate and the interior wall of the housing 4', with the rollers
10 rolling therebetween during "overrunning" of the heat engine.
It is also important to point out that the unit of
Figure 6 makes the mounting operation of the
clutch device more expeditious and simpler, thus
reducing the assembling time, to the benefit of
manufacturing costs.
It should also be pointed out that the metal
plate 9 withstands the heat being developed during "overrunning", and accordingly the typical drawbacks of deformation in conventional plastics
plates are avoided. Finally, the axial overall size of the clutch device is reduced because of the
provision of only one plate and axial development
is restricted to the thickness thereof.
Claims (11)
1. A free wheel clutch device for a starting
motor of a heat engine, of the type comprising a hub, providing a generally cup-shaped housing, mounted on a splined portion of the rotational shaft for the starting motor and a toothed pinion slidably mounted on said shaft for engagement with a ring gear of the heat engine, and wherein said hub and pinion can be coupled and uncoupled by means of a plurality of axial rollers and roller presser springs carried by a plate-like member non-rotatably received within the cup-shaped housing of the hub, characterized in that said plate-like member comprises a metal plate having around its periphery a plurality of axial expansions or fins each of which provides on one side retaining means for a roller, and on the opposite side supporting means for a roller presser spring, and the rollers and roller pressure springs being assembled so that each roller and a roller presser spring therefor are located between said retaining means of one fin and said supporting means of an adjacent fin.
2. A clutch device according to Claim 1, characterized in that said roller retaining means substantially define an angular housing open at the side of the supporting means for the roller presser spring.
3. A clutch device according to Claim 1 or
Claim 2, characterized in that said roller retaining means are provided by fin extensions partly on the expansion or fin plane and partly on a transverse plane through the inside of said plate.
4. A clutch device according to Claim 3, characterized in that said roller retaining extensions comprise two side extensions on the expansion orfin plane and an intermediate extension on the transverse plane.
5. A clutch device according to any preceding claim, characterized in that said supporting means for the roller presser spring is a fin extension on the expansion or fin plane.
6. A clutch device according to any preceding claim, characterized in that said plate is provided from a metal sheet by first a shearing operation to develop the expansions or fins in planar form, followed by a bending operation on the thus sheared extensions in order to form said rollerretaining and spring-supporting means.
7. A clutch device according to Claim 6, characterized in that said bending operation consists of both bending the sheared fins or extensions to cause the latter to take an axial arrangement, and bending and bending a part of the roller retaining extensions according to a plane transversely of the expansions or fins and passing through the plate inside.
8. A clutch device according to any preceding claim, characterized in that said plate, rollers and roller presser springs are pre-assembled to form a unit which is inserted into said cup-shaped housing of the hub, said rollers in said unit being in contact with their respective retaining means through the action of said roller presser springs.
9. A pre-assembled roller-spring unit for a freewheel clutch device of the type described, comprising a metal plate having a contour shaped to conform with the contour of the generally cupshaped housing of the hub, so as to be nonrotatably receivable within said housing, the metal plate having around its periphery a plurality of axial expansioris or fins each of which provides on one side retaining means for a roller and on the opposite side supporting means for a roller presser spring, and a roller retained by said retaining means of each said fin under the action of a roller presser spring supported on said supporting means of an adjacent fin.
1 0. A clutch device as hereinbefore described with reference to Figures 1-8 of the accompanying drawings.
11. A pre-assembled )llei -:pr: lg unit for a free wheel clutch device, substantially as hereinbefore described with reference to Figures 6 and 7 of the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT25236/81A IT1140291B (en) | 1981-11-24 | 1981-11-24 | FREEWHEEL ENGINE ENGINE STARTING DEVICE FOR INTERNAL COMBUSTION ENGINE |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2110318A true GB2110318A (en) | 1983-06-15 |
GB2110318B GB2110318B (en) | 1985-07-24 |
Family
ID=11216087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08233400A Expired GB2110318B (en) | 1981-11-24 | 1982-11-23 | Freewheel clutch for starter motor |
Country Status (7)
Country | Link |
---|---|
DE (1) | DE3243167A1 (en) |
ES (1) | ES8400799A1 (en) |
FR (1) | FR2517001A1 (en) |
GB (1) | GB2110318B (en) |
IN (1) | IN158960B (en) |
IT (1) | IT1140291B (en) |
TR (1) | TR21900A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2807722B2 (en) * | 1990-08-03 | 1998-10-08 | 光洋精工株式会社 | One-way clutch |
JP3170608B2 (en) * | 1992-01-24 | 2001-05-28 | 光洋精工株式会社 | One-way clutch device |
DE112011100937B4 (en) * | 2010-03-18 | 2020-02-13 | Schaeffler Technologies AG & Co. KG | Permanently engaged starter with a dry freewheel |
DE102016004031A1 (en) * | 2016-04-02 | 2017-10-05 | Borgwarner Inc. | Freewheel and method for producing such a freewheel |
DE102018118299B3 (en) * | 2018-07-27 | 2019-09-26 | Stabilus Gmbh | driving means |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1965576U (en) * | 1964-12-28 | 1967-08-03 | Ford Werke Ag | VERBUND PLANETARY GEARS. |
DE2002074A1 (en) * | 1970-01-19 | 1971-07-29 | Bosch Gmbh Robert | Pinion gear for starters of internal combustion engines |
DE2348733A1 (en) * | 1973-09-28 | 1975-04-10 | Volkswagenwerk Ag | Securing device for overrun clutch cage - has clamping ramps in circular zone between clutch rings to prevent axial movement |
DE2758839A1 (en) * | 1977-12-30 | 1979-07-12 | Borg Warner Stieber Gmbh | Spring units in clamp roller free movement coupling - comprise folding spring and stirrup which is fixed in inner star recesses, or on its face |
-
1981
- 1981-11-24 IT IT25236/81A patent/IT1140291B/en active
-
1982
- 1982-11-05 IN IN815/DEL/82A patent/IN158960B/en unknown
- 1982-11-18 ES ES517465A patent/ES8400799A1/en not_active Expired
- 1982-11-22 FR FR8219489A patent/FR2517001A1/en active Pending
- 1982-11-22 TR TR21900A patent/TR21900A/en unknown
- 1982-11-23 DE DE19823243167 patent/DE3243167A1/en not_active Ceased
- 1982-11-23 GB GB08233400A patent/GB2110318B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IN158960B (en) | 1987-02-28 |
IT8125236A0 (en) | 1981-11-24 |
ES517465A0 (en) | 1983-11-16 |
FR2517001A1 (en) | 1983-05-27 |
DE3243167A1 (en) | 1983-06-09 |
TR21900A (en) | 1985-10-11 |
ES8400799A1 (en) | 1983-11-16 |
GB2110318B (en) | 1985-07-24 |
IT1140291B (en) | 1986-09-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20001123 |