CN112780471A - Starter for internal combustion engine - Google Patents
Starter for internal combustion engine Download PDFInfo
- Publication number
- CN112780471A CN112780471A CN201911086793.2A CN201911086793A CN112780471A CN 112780471 A CN112780471 A CN 112780471A CN 201911086793 A CN201911086793 A CN 201911086793A CN 112780471 A CN112780471 A CN 112780471A
- Authority
- CN
- China
- Prior art keywords
- starter
- overrunning clutch
- intermediate sheath
- bearing
- planetary gear
- 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.)
- Pending
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Classifications
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- 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
- F02N11/00—Starting of engines by means of electric motors
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- 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
- F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
- F02N15/043—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the gearing including a speed reducer
- F02N15/046—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the gearing including a speed reducer of the planetary type
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- 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
- F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
- F02N15/06—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the toothed gears being moved by axial displacement
- F02N15/066—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the toothed gears being moved by axial displacement the starter being of the coaxial type
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention relates to a starter (101) for an internal combustion engine, comprising a pinion shaft (110), an overrunning clutch (120) coupled to the pinion shaft (110), a planetary gear (130) coupled to the overrunning clutch (120), and a motor shaft (151) of an electric motor (150), which motor shaft (151) is coupled to the planetary gear (130), which starter comprises an intermediate sheath (160) supported in the starter (101), which starter further comprises at least one bearing element (161) which is arranged between the overrunning clutch (120) and the intermediate sheath (160) and supports the overrunning clutch (120) in the axial direction relative to the intermediate sheath (160).
Description
Technical Field
The present invention relates to a starter for an internal combustion engine.
Background
The starter is used to start an internal combustion engine and generally includes a pinion shaft with a pinion gear, an overrunning clutch coupled to the pinion shaft, a planetary gear assembly coupled to the overrunning clutch, and a motor shaft of an electric motor coupled to the planetary gear assembly. The rotational speed of the motor is effectively reduced by means of the planetary gear transmission and the overrunning clutch allows the pinion to rotate at a higher rotational speed than the rotational speed provided by the output of the planetary gear. The latter may occur after starting the internal combustion engine and after the internal combustion engine reaches a high rotational speed.
A problem that may occur with starters of this type during forward pushing of the pinion or pinion shaft in the direction of the internal combustion engine or the crown gear (or flywheel) of the internal combustion engine is that an axial force is exerted on the pinion shaft in the direction of the electric motor. This may cause forces that may cause deformation and/or damage to the components or assemblies of the starter. In addition, the starter may be blocked due to such deformation. The present invention aims to overcome these problems.
Disclosure of Invention
This object is achieved by providing a starter for an internal combustion engine according to the independent claim. Advantageous further embodiments form the subject matter of the dependent claims and the subsequent description.
The invention relates to a starter for an internal combustion engine, comprising a pinion shaft, an overrunning clutch coupled to the pinion shaft, a planetary gear drive coupled to the overrunning clutch, and a motor shaft of an electric motor, which is coupled to the planetary gear drive. In addition, the starter typically includes a pinion gear supported on a pinion shaft. The typical starter also includes an engagement relay and a lever for pushing the pinion forward in the axial direction.
In such a starter, an intermediate sheath or cover is provided, which is supported in the starter. The intermediate jacket can at least partially surround the planetary gear in the circumferential direction, i.e., the intermediate jacket can be arranged at least partially radially outside the planetary gear. In addition, the starter comprises at least one bearing element which is arranged between the overrunning clutch and the intermediate sheath and supports the overrunning clutch in the axial direction relative to the intermediate sheath.
Preferably, the intermediate jacket is arranged at least partially in the axial direction between the overrunning clutch and the planetary gear and at least partially in the radial direction overlapping the overrunning clutch, wherein the at least one bearing element is arranged between the overrunning clutch and the intermediate jacket.
Such an additional intermediate sheath and at least one bearing element allow axial forces acting on the pinion shaft to be deflected at least partially to the intermediate sheath, which can be safely supported and fixed in the starter. In turn, the force acting on the planetary gear via the pinion shaft and the overrunning clutch is reduced or even eliminated. Thus, the planetary gear or other components are not or at least less deformed and wear of the components on the starter is reduced.
Advantageously, the starter comprises a plurality of support elements arranged between the overrunning clutch and the intermediate sheath. Suitable support elements may comprise or consist of steel and/or ceramic. Suitable bearing elements may have a lubricant coating. One preferred type of such bearing elements is a bearing or support ball (or sphere). Such support balls may be evenly distributed over the circumference, such as is used in typical ball bearings, which are fixed in position relative to each other by means of support rings or the like. Such a ball allows for an easy and inexpensive construction of the actuator and provides effective support.
In order to enhance the bearing and support effect, the intermediate sheath and/or the overrunning clutch may be provided with a recess, which supports the at least one bearing element.
Typically, such starters also comprise a cover disc or a jacket which is arranged in the axial direction between the planetary gear and the electric motor. Preferably, the cover disc comprises a bearing, which supports the motor shaft. The proposed intermediate sheath and at least one bearing element also contribute to reducing the forces acting on such a cover disc, which would otherwise be caused by axial forces.
Furthermore, such starters typically comprise a motor housing for the electric motor. The motor housing may then support the intermediate sheath, and the cover disc may be clamped between the intermediate sheath and the motor housing. The intermediate sheath may for example be fixed or coupled to the motor housing in order to provide a robust housing structure. In addition, the cover tray can be reliably fixed in this way.
The overrunning clutches mentioned generally comprise an inner ring and an outer ring which are rotatably coupled to one another, for example by means of ball bearings. Then, the pinion shaft is usually supported or even fixed into the inner race. Additionally, a bearing shield may be provided that includes a bearing that supports the inner race of the overrunning clutch and is coupled or secured to the intermediate shield. This allows for a robust construction of the starter.
Furthermore, with respect to the above-mentioned overrunning clutch, the at least one bearing element preferably supports the outer race of the overrunning clutch axially with respect to the intermediate sheath.
Other advantages and embodiments of the invention will become apparent from the description and drawings.
It is to be noted that the aforementioned features and the features that will be further described below can be used not only in the respectively indicated combination but also in further combinations or alone without departing from the scope of the present invention.
Drawings
The invention will now be described with reference to the accompanying drawings, which illustrate a preferred embodiment.
Fig. 1 schematically shows parts of a starter not relevant to the present invention;
fig. 2 schematically shows the components of a starter according to the invention in a preferred embodiment.
Detailed Description
A conventional starter 100 for an internal combustion engine, which is not relevant to the invention, is shown at least partially in fig. 1 in order to explain the problems that arise during the action of axial forces on the pinion shaft.
The starter 100 includes a pinion shaft 110, an overrunning clutch 120 coupled to the pinion shaft 110, a planetary gear assembly 130 coupled to the overrunning clutch 120, and a motor shaft 151 of an electric motor 150, the motor shaft 151 being coupled to the planetary gear assembly 130.
The electric motor 150 is surrounded by a motor housing 152, and the overrunning clutch 120 is surrounded by a bearing housing 125. The overrunning clutch 120 in turn comprises an inner ring 121 and an outer ring 122, which inner ring 121 and outer ring 122 are coupled to each other, for example by means of a roller bearing 123. The bearing housing 125 includes a bearing 126 supporting the inner race 121.
Furthermore, the inner race 121 is drivingly coupled to the pinion shaft 110, and the pinion shaft 110 is drivingly coupled to the pinion 115. The pinion gear 115 may be engaged with a crown gear (or flywheel) 200 coupled to an internal combustion engine (not shown) by axial movement of the pinion shaft 110 and the pinion gear 115.
The planetary gear assembly 130 includes, for example, a plurality of planetary gears, one of which is designated by reference numeral 131. Each of these planet gears 131 is coupled to the outer race 122 of the overrunning clutch 120 by a pin. Thus, the outer race 122 acts as a planet carrier. The planetary gear assembly 130 also includes a sun gear 132 that is fixed to the motor shaft 151.
Furthermore, a cover disc 140 is provided between the bearing shield 125 and the motor housing 152 in the axial direction (which is defined by the rotational axes of the electric motor and the shaft). In particular, the cover disk 140 is clamped between the bearing shield 125 and the motor housing 152. In addition, the cover disk 140 includes a (centrally located) bearing 141, the bearing 141 supporting the motor shaft 151.
In starter 100, F and the corresponding arrows indicate the axial force acting on pinion shaft 110 and its orientation within the starter and its components. It can be seen that the force F acts on the planetary gear 130, and thus on the cover disk 140, via the outer ring 122 of the overrunning clutch 120. Thus, the force F causes deformation of the planetary gear assembly 130 and the cover disk 140. This can lead to damage to these and/or other components, which can ultimately lead to starter blocking.
In fig. 2, a starter 101 for an internal combustion engine according to the invention is shown at least partially in a preferred embodiment in order to explain the basic idea of the invention for overcoming the problems mentioned with respect to fig. 1. Like parts are denoted by like reference numerals. Thus, for further explanation, reference may be made to FIG. 1. Only the differences from the starter 100 shown in fig. 1 will be explained in detail hereinafter.
An intermediate sheath 160 is provided, which is arranged in the axial direction between the bearing sheath 125 and the motor housing 152. It can be seen that the axial length of the bearing shield 125 becomes smaller, or in other words, a portion of the bearing shield 125 as shown in FIG. 1 is replaced by the intermediate shield 160.
The intermediate sheath 160 is disposed at least partially between the outer race 122 of the overrunning clutch 120 and the planetary gear assembly 130 in an axial direction and at least partially overlaps the outer race 122 of the overrunning clutch 120 in a radial direction. The outer race 122 of the overrunning clutch 120 extends in a radial direction relative to the starter 100 shown in FIG. 1.
Furthermore, a plurality of support balls, one of which is denoted by reference numeral 161, are provided in the axial direction between the outer ring 122 of the overrunning clutch 120 and the intermediate sheath 160. The bearing balls 161 are provided in recesses in the outer ring 122 and the intermediate sheath 160, the latter recesses being denoted by reference numeral 162. Thus, the bearing balls 161 support the overrunning clutch 120 in the axial direction relative to the intermediate sheath 160.
Accordingly, a cover disk 140 is provided between the intermediate sheath 160 and the motor housing 152. In particular, the cover disk 140 is clamped between the intermediate sheath 160 and the motor housing 152.
In addition, in the starter 101, F and the corresponding arrows indicate the axial force acting on the pinion shaft 110 and its course inside the starter and its components (similar to fig. 1). It can be seen that force F acts on the intermediate sheath 160 via the outer race 122 of the overrunning clutch 120 and the bearing balls 161. In contrast to the situation shown in fig. 1, the force F is deflected radially outwards to the intermediate sheath 160. Thus, the risk of deformation of the planetary gear 130 and the cover disc 140 is reduced or even prevented. Also, the risk of these components and/or other components being damaged and, ultimately, blocking of the starter can be prevented.
Claims (10)
1. A starter (101) for an internal combustion engine, comprising a pinion shaft (110), an overrunning clutch (120) coupled to the pinion shaft (110), a planetary gear transmission (130) coupled to the overrunning clutch (120), and a motor shaft (151) of an electric motor (150), the motor shaft (151) being coupled to the planetary gear transmission (130),
characterized in that the starter (101) comprises an intermediate sheath (160) supported in the starter,
the starter further comprises at least one bearing element (161) which is arranged between the overrunning clutch (120) and the intermediate sheath (160) and supports the overrunning clutch (120) in the axial direction relative to the intermediate sheath (160).
2. Starter (101) according to claim 1, characterized in that the intermediate sheath (160) is arranged at least partially in axial direction between the overrunning clutch (120) and the planetary gear (130) and at least partially in radial direction overlapping the overrunning clutch (120), and at least one bearing element (161) is arranged between the overrunning clutch (120) and the intermediate sheath (160).
3. Starter (101) according to claim 1 or 2, characterized in that it comprises a plurality of support elements (161) arranged between the overrunning clutch (120) and the intermediate sheath (160).
4. The starter (101) of claim 3, wherein the plurality of bearing elements (161) comprise support balls.
5. Starter (101) according to any of the preceding claims, characterized in that the intermediate sheath (160) and/or the overrunning clutch (120) comprise a recess (162) supporting the at least one bearing element (161).
6. Starter (101) according to any of the preceding claims, characterized in that the starter further comprises a cover disc (140) arranged in axial direction between the planetary gear (130) and the electric motor (150).
7. Starter (101) according to claim 6, characterized in that the cover disc comprises a bearing (141) supporting the motor shaft (151).
8. Starter (101) according to claim 6 or 7, characterized in that it further comprises a motor housing (152) for the electric motor (150), which supports the intermediate sheath (160) and between which the cover disc (140) is clamped (140) and the motor housing (152).
9. Starter (101) according to any of the preceding claims, characterized in that the starter further has a bearing sheath (125) comprising a bearing (126) supporting the inner ring (121) of the overrunning clutch (120), and in that the bearing sheath (125) is coupled or fixed to the intermediate sheath (160).
10. Starter (101) according to any of the preceding claims, characterized in that the at least one bearing element (161) supports the outer ring (122) of the overrunning clutch (120) in an axial direction with respect to the intermediate sheath (160).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911086793.2A CN112780471A (en) | 2019-11-08 | 2019-11-08 | Starter for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911086793.2A CN112780471A (en) | 2019-11-08 | 2019-11-08 | Starter for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112780471A true CN112780471A (en) | 2021-05-11 |
Family
ID=75748995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911086793.2A Pending CN112780471A (en) | 2019-11-08 | 2019-11-08 | Starter for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112780471A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60187760A (en) * | 1984-03-05 | 1985-09-25 | Nippon Denso Co Ltd | Starter |
| CN1143160A (en) * | 1995-05-10 | 1997-02-19 | 日本电装株式会社 | Starter with pinion backspace prevention structure |
| CN1641210A (en) * | 2004-01-16 | 2005-07-20 | 株式会社电装 | Starter |
| CN1800623A (en) * | 2004-12-17 | 2006-07-12 | 株式会社电装 | Engine starter equipped with torque absorber |
| JP2008082252A (en) * | 2006-09-28 | 2008-04-10 | Mitsuba Corp | Starter motor with idle gear |
| CN101251070A (en) * | 2007-02-20 | 2008-08-27 | 株式会社电装 | Starter having excessive-torque-absorbing device |
| CN103511156A (en) * | 2012-06-26 | 2014-01-15 | 罗伯特·博世有限公司 | Starting device and method of assembling a starter device |
-
2019
- 2019-11-08 CN CN201911086793.2A patent/CN112780471A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60187760A (en) * | 1984-03-05 | 1985-09-25 | Nippon Denso Co Ltd | Starter |
| CN1143160A (en) * | 1995-05-10 | 1997-02-19 | 日本电装株式会社 | Starter with pinion backspace prevention structure |
| CN1641210A (en) * | 2004-01-16 | 2005-07-20 | 株式会社电装 | Starter |
| CN1800623A (en) * | 2004-12-17 | 2006-07-12 | 株式会社电装 | Engine starter equipped with torque absorber |
| JP2008082252A (en) * | 2006-09-28 | 2008-04-10 | Mitsuba Corp | Starter motor with idle gear |
| CN101251070A (en) * | 2007-02-20 | 2008-08-27 | 株式会社电装 | Starter having excessive-torque-absorbing device |
| CN103511156A (en) * | 2012-06-26 | 2014-01-15 | 罗伯特·博世有限公司 | Starting device and method of assembling a starter device |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210511 |