WO2012076548A2

WO2012076548A2 - Starter device

Info

Publication number: WO2012076548A2
Application number: PCT/EP2011/071964
Authority: WO
Inventors: Sven Hartmann; Balasubramaniam Venkatasubramaniam
Original assignee: Robert Bosch Gmbh
Priority date: 2010-12-09
Filing date: 2011-12-06
Publication date: 2012-06-14
Also published as: EP2649300A2; WO2012076548A3; DE102010062692A1; CN103261672B; CN103261672A

Abstract

The invention relates to a starter device (10) for internal combustion engines, comprising a starter motor (13) that is located in a housing (28). The motor drives an output shaft (116) by means of a planetary gear train (83). The planetary gear train (83) comprises a ring gear (95) that is supported in the housing (28) by means of at least one damping element (202). The damping element or elements (202) are flat and consist of a first material (210) comprising at least one region (212) of a second material that has different damping characteristics from the first material, or at least one weakening (216) of the material is provided in the at least one region (212).

Description

Description title

starter

Prior art DE 32 25 957 A1 relates to a starting device for internal combustion engines. This includes a countershaft between a drive shaft and a starter motor. It is provided a transmission shaft on which a Einspurgetriebe is arranged movable with a starter pinion. The countershaft is provided with a damping, which is used as a resilient receiving a ring gear of the intermediate gear in an intermediate storage. By a mobility of the ring gear relative to the torque of the drive motor to the ring gear of anzudrehenden engine transmitting parts, the compression and decompression shocks generated by the engine are so far attenuated that they do not damage the standing under power during cranking parts, especially a Einspurgetriebe and the Cogging between the sprocket and the drive shaft of the starter cause.

DE 196 48 889 A1 also relates to a starter for a

Internal combustion engine. This has an electric starter motor which drives a drive shaft. This is connected via a planetary gear, which drives a freewheel, connected to the output shaft. On the output shaft, the drive pinion sits for the

Internal combustion engine. Since in the drive train of the starter load changes occur, causing tooth flank shocks and unwanted noise emissions is between the planetary gear and the freewheel receiving intermediate storage

Damping element arranged, which consists of a vulcanized with two retaining rings rubber element. This allows a relative rotation between drive and

Output.

US 2008/0184845 A1 relates to a starting device for

Internal combustion engines. The starting device comprises a housing, as well as a starter motor, which is arranged within the housing. The engine includes one Anchor shaft, which is a planetary gear, which is disposed within the housing and in operative connection with the armature shaft. The planetary gear includes a ring gear, a carrier shaft in operative connection with the Planetenradantriebszug for representing a torque of the armature shaft, transmitted through the Planetenräderzug, and a

Damping device in exclusive connection between the sprocket and the housing.

DESCRIPTION OF THE INVENTION According to the invention, it is proposed to provide at least one damping element, which is located on the

Circumference of a ring gear of the epicyclic gear is arranged and the ring gear in the housing of the starting device, in particular in the pole tube superimposed provided at least one damping element which has at least one region which is preferably in

Circumferentially extending in which either a material with the base material of the

Damping element deviating damping properties is installed or in which a shape weakening, for example by introducing a cavity in the form of an opening is provided.

Following the solution proposed by the invention, the ring gear of the

Circulating gear in the pole tube with a number of inventively proposed

Damping elements stored. For this purpose, the damping elements are arranged in a contact surface of the ring gear and arranged distributed for example in a 120 ° division or a 90 ° division on the circumference of a contact surface of the ring gear. Subsequently, the ring gear of the epicyclic gear is mounted in the housing, preferably in the pole tube and is supported in at least three places by the inventively proposed damping elements in the housing.

The at least one region in which either a second material is arranged with properties deviating from the base material of the damping element or in which there is a material weakening, is arranged on one or both sides with respect to a passage opening of the damping element. The second material with damping properties deviating from the first material may, for example, be a softer plastic which has a lower hardness or else a softer rubber which has a lower hardness than the base material of the damping element. In addition, there is the possibility in the at least one area, the one or both sides next to the Through opening of the damping element extends to share a foam or a material with foam constituents, so as to introduce trapped air, which also represents a second material having damping properties that are different from the first material from which the damping element is made.

Instead of embedding a second material in the regions on one or both sides of the passage openings in the damping element, cavities or openings can also be created in the latter. The openings may, for example, be circular or oval and give the inventively proposed damping element, preferably in the tangential direction, extending different

Damping properties. The at least one region of the damping element, in which either a targeted material weakness is formed or in which the second material deviates from the first material, preferably extends

Damping properties is included - based on the mounting position of the

Damping element substantially in the tangential direction.

In a further advantageous embodiment, the damping element proposed according to the invention can also be manufactured as a composite component. In this case, one or both sides of the passage opening spring elements in a very soft

Embedded or poured plastic material. The composite component may vary depending on

Purpose one or both sides of the passage opening arranged in the Kunststoffbzw. Rubber material embedded coil spring elements or the like.

Preferably, the composite component is designed so that a base plastic material is not damaged during operation of the starting device.

Brief description of the drawings

With reference to the drawing, the invention will be described below in more detail.

It shows:

1 shows a longitudinal section through a starting device, 2 shows the installation position of the damping elements and a damping element in a perspective view,

Figure 3 shows a first embodiment of the invention proposed

Damping element,

Figures 4.1, 4.2, 4.3,

4.4 and 4.5 further embodiments of the invention proposed

Damping element,

Figure 5 shows a further embodiment of the invention proposed

Damping element and

Figure 6 shows an embodiment of the invention proposed

Damping element as a composite component.

variants

FIG. 1 shows a starting device 10 in a longitudinal section.

The starting device 10 according to Figure 1, for example, a starter motor 13 and a Vorspuraktuator 16, which may be, for example, a relay or a starter relay. The starter motor 13 and the electric Vorspuraktuator 16 are fixed to a common drive end plate 19. The starter motor 13 is functionally to drive a starter pinion 22 when it in the ring gear 25 of the not shown here

Internal combustion engine is eingespurt.

The starter motor 13 has a pole tube as a housing 28, which carries on its inner circumference pole pieces 31, which are each wrapped by a field winding 34. The pole shoes 31 in turn surround an armature 37, which has an armature packet 43 constructed from fins 40 and an armature winding 49 arranged in grooves 46. The armature package 43 is pressed onto a drive shaft 44. Furthermore, a commutator 52, which is constructed among other things from individual commutator fins 55, is attached to the end of the drive shaft facing away from the starting pinion 22. The commutator bars 55 are electrically connected in a known manner with the armature winding 49, that at Energization of the commutator fins 55 by carbon brushes 58 results in a rotational movement of the armature 37 in the pole tube 28. One between the electric drive 16 and the

Starter motor 13 arranged power supply 61, supplied in the on state, both the carbon brushes 58 and the field winding 34 with power. The drive shaft 44 is commutator side supported with a shaft journal 64 in a sliding bearing 67, which in turn is held stationary in a commutator bearing cover 70. Of the

Commutator bearing cap 70 in turn is by means of tie rods 73 which can be arranged distributed over the circumference of the pole tube 28 (screws, for example, two, three or four pieces) in the drive bearing plate 19 is attached. It relies while the pole tube 28 am

Drive bearing plate 19 from the commutator and 70 on the pole tube 28th

In the drive direction, a sun gear 80 connects to the armature 37, which is part of a planetary gear, in particular a planetary gear 83. The sun gear 80 is surrounded by a plurality of planet gears 86, usually three planet wheels 86, which are supported by means of rolling bearings 89 on journals 92. The planet gears 86 roll in a ring gear 95, which is mounted outside in the pole tube 28. Towards the output side, the planet gears 86 are adjoined by a planet carrier 98, in which the axle journals 92 are received. The planet carrier 98 will turn in one

Intermediate storage 101 and a slide bearing 104 arranged therein. The

Intermediate storage 101 is designed pot-shaped, that in this both the

Planet carrier 98 and the planetary gears 86 are taken even. Of the

Planet carrier 98 is again in an intermediate storage 101 and a therein

arranged sliding bearing 104 is stored. The intermediate bearing 101 is designed cup-shaped, that in this both the planetary carrier 98 and the planet gears 86 are added. Furthermore, the ring gear 95 is arranged in the cup-shaped intermediate bearing 101, which is ultimately closed by a cover 107 relative to the armature 37. Also, the intermediate bearing 101 is supported with its outer circumference on the inside of the pole tube 28. The armature 37 has on the end facing away from the commutator 52 end of the drive shaft 44 a further shaft journal 1 10, which is also received in a sliding bearing 1 13. The sliding bearing 1 13 in turn is in a central bore of the

Planet carrier 98 recorded. The planet carrier 98 is integrally connected to the output shaft 1 16. The output shaft 1 16 is supported with its end 119 facing away from the intermediate bearing 101 in a further bearing 122, which is fixed in the drive end plate 19. The output shaft 1 16 is divided into several sections. Thus, the section which is arranged in the sliding bearing 104 of the intermediate bearing 101, a section with a

Spur gear 125 (internal toothing), which is part of a shaft-hub connection 128. The shaft-hub connection 128 in this case allows the axially rectilinear sliding of a driver 131. The driver 131 is a sleeve-like extension which is integrally connected to a cup-shaped outer ring 132 of the freewheel 137. The freewheel 137 (directional locking mechanism) further consists of an inner ring 140, which is arranged radially within the outer ring 132. Between the inner ring 140 and the outer ring 132 clamping body 138 are arranged. The clamping body 138 prevent in cooperation with the inner ring and the outer ring 132, 140 a relative rotation between the outer ring 132 and the inner ring 140 in a second direction. In other words, the freewheel 137 allows a circumferential relative movement between the inner ring 140 and the

Outer ring 132 only in one direction. In this embodiment, the inner ring 140 is integral with the starter pinion 22 and its helical teeth 143

(External helical teeth) executed. The starter pinion 22 may alternatively be designed as a straight toothed pinion. Instead of electromagnetically excited pole pieces 31 with exciter winding 34, permanent magnetically excited poles could also be used.

The electric Vorspuraktuator 16 and the linearly movable armature 168 also have the task, by means of a tension element 187 to move in the drive bearing plate 19 rotatably arranged lever 190. The lever 190, which is usually designed as a fork lever, surrounds with two "tines" not shown here on its outer circumference two discs 193 and 194 on its outer periphery, to a trapped between these driver ring 197 for freewheel 137 out against the Wderstand the spring 200th to move and thereby einzura the starting pinion 22 in the ring gear 25, the internal combustion engine, not shown in Figure 1.

Subsequently, the Einspurmechanismus will be discussed. The electric

Vorspuraktuator 16 has a bolt 150 which is an electrical contact and in the case of Einbausein in the vehicle to the positive pole of an electric starter battery, which is not shown here, is connected. The bolt 150 is passed through a lid 153. A second bolt 152 is a connection for the electric starter motor 13, which is supplied via the power supply 61 (thick wire). The lid 153 includes a housing 156 made of steel, which by means of several fasteners 159

(For example, screws) is attached to the drive end plate 19. In the electric Vorspuraktuator 16 is a pusher 160 for applying a pulling force on the fork lever 190 and a switching device 161 arranged. The pusher 160 has a winding 162 and the switching device 161 has a winding 165. The winding 162 of the pusher 160 and the winding 165 of the switching device 161 each cause in the on state an electromagnetic field which flows through various components. The shaft-hub connection 128 may be equipped with a helical toothing instead of a straight toothing 125. The combinations are possible according to which a) the starter pinion 22 is helically toothed and the shaft-hub connection 128 has a straight toothing 125, b) the starter pinion 22 is helically toothed and the shaft-hub connection 128 has helical tooth toothing or c) the starter pinion 22 is spur-toothed and the shaft-hub connection 128 is a

Has steep thread toothing.

From the representation according to FIG. 2, it can be seen that the ring gear 95 of the planetary gear 83, which is designed in particular as a planetary gear, has an outer side 206. On the outside 206 are located at different points in Figure 2 also shown in perspective representation damping elements 202. In the

Damping elements 202 are rubber or plastic components, which have a substantially planar configuration and is formed with a curvature in the tangential direction, the curvature of the outer side 206 of the ring gear 95 of the

Epicyclic 83 corresponds. As can be seen from the illustration according to FIG. 2, openings 208 which are substantially angular in design in the damping elements 202 are provided. For reasons of better installation are on the front sides of the

Damping elements 202, which are shown in Figure 2, bevels 214 performed.

FIG. 2 shows that the output shaft 16 extends from the ring gear on which the starter pinion 22 (not shown in FIG. 2) is formed. The output shaft 1 16 comprises a portion which is provided with a toothing 125, which is designed here as a helical toothing. On the circumference of the ring gear 95, ie on the abutment surface 206, the damping elements 202 are arranged, for example, in 90 ° pitch or 120 ° pitch. At the installed state of the planetary gear 83, the damping elements 202 support the outer peripheral surface 206 of the ring gear 95 of the epicyclic gear 83 in the pole tube 28, which constitutes the housing of the starter motor 13 of the starting device 10. The illustration according to FIG. 3 shows a first embodiment variant of the damping elements proposed according to the invention.

The damping element 202 shown in Figure 3 is made of a first material 210, i. which is also referred to as a base material manufactured. From the perspective

Representation according to Figure 3 shows that the damping element 202 at its

End faces has the bevels 214. On both sides of a passage opening 208, which extends through the thickness of the damping element 202, are located in the

Embodiment variant according to Figure 3 areas 212, in which a second material are embedded. The second material has been removed from the first material 210, i. the base material of the

Damping element 202 deviating damping properties. For example, in the areas 212, which preferably extend on both sides of the passage opening 208, a second material may be arranged, which is substantially softer, so that the

Damping element 202 in the installed state, in particular in the circumferential direction, i. in the tangential direction a certain damping characteristic, which better absorbs the jerky at the start of the internal combustion engine load change in compression and decompression.

Figures 4.1 to 4.5 show further embodiments of the invention proposed damping element.

In contrast to the first embodiment variant of the damping element 202 proposed according to the invention shown in FIG. 3, the damping elements illustrated in FIGS. 4.1 and 4.2 have targeted material weakenings 216. As can be seen from FIG. 4.1, the material weakenings 216 in circular openings 220 on both sides of the passage opening 208 are indicated.

This embodiment variant, the damping element 202 is made of the first material 210, the material weakening 216 causes the geometry of the material weakening 216, here formed as circular openings 220 determine the damping characteristics of the damping element shown in Figure 4.1.

FIG. 4.2 shows a damping element 202, on which likewise a material weakening 216 in the form of oval openings 222 is realized. Depending on the configuration, in particular size of the cavities 218, in the figures 4.1 and 4.2 formed as circular openings 220th or as ovals 222, different damping properties of the damping element, which in particular affect the damping characteristic in the tangential direction, occur. Figures 4.3, 4.4 and 4.5 are more

To see execution options. Thus, in the embodiment variant shown in FIG. 4.3, the damping element is provided with a cavity 218 formed as a rhombus 236, which is formed in the damping element 202. FIG. 4.4 shows the embodiment of the cavity 218 as a rectangle or square, while in the embodiment according to FIG. 4.5 the cavity 218 is designed as a double diamond 238 in the damping element 202. Although not shown in the drawing, the cavities 218 according to FIG. 4.1 can be designed in the form of an "8".

The illustration according to FIG. 5 is a further embodiment of the invention

According to the invention proposed damping element. FIG. 5 shows that material weaknesses 216 are provided on both sides of the passage opening 208, which is arranged angularly in this design variant, in that a foam 224 or a material with foam constituents is arranged on both sides of the opening 208. The foam contains fragrant inclusions, which are the elastic properties of the

Damping element 202, especially in the tangential direction affect quite crucial.

FIG. 6 shows a further possible embodiment of the damping element proposed according to the invention. This is a composite system 216. In this embodiment, the base material from which the damping element 202 is made, be it plastic, be it rubber, is chosen so that it is very elastic

Features. This material is embedded in embedding 228 a first spring element 232, preferably a further second spring element 234.

The two spring elements 232, 234 preferably extend on both sides of the opening 208 of the damping element 202, designed as a composite element 216, each up to the

In all embodiments of the damping element 202 as shown in the figures described above, the first material 210, ie the base material of the damping element has a higher hardness than the material which is located in the region 212 for the second material. The Softening material used in area 212 for the second material is softer so that it more restrains the shocks occurring during operation of the starter.

Claims

Claims 1. Starting device (10) for internal combustion engines with a in a housing (28) arranged starter motor (13) via an epicyclic gear (83) drives an output shaft (1 16), wherein the epicyclic gear (83) comprises a ring gear (95) , which is mounted with at least one damping element (202) in the housing (28), characterized in that the at least one damping element (28) of a first material (210) is formed flat and at least one region (212) with a second material , which deviates from the first material

Has damping properties, or in the at least one region (212) is a material weakening (216).

2. Starting device (10) according to claim 1, characterized in that the

Damping element (202) has an opening (208) and the at least one region (212) adjacent to the opening (208).

3. Starting device (10) according to claim 1, characterized in that the at least one region (212) in the damping element based on its installation position in

Oriented circumferentially.

4. Starting device (10) according to claim 1, characterized in that the second material has a lower hardness than the first material (210).

5. Starting device (10) according to claim 1, characterized in that the second material is a foam (224) or contains foam components.

6. Starting device (10) according to claim 1, characterized in that the

Material weakening (216) comprises a cavity (218) or an opening which is circular (220) or oval (222), a rectangle or square 240, a rhombus 236, a double diamond 238.

7. Starting device (10) according to claim 1, characterized in that on both sides of the opening (208) in the damping element (202) in each case a region (212) is executed.

8. Starting device (10) according to claim 1, characterized in that the

Damping element (202) is designed as a composite element (226), wherein at least one spring element (232, 234) is embedded in the material.

9. Starting device (10) according to claim 8, characterized in that the first

Material (210) of the damping element (202) is a soft plastic material, in which the at least one spring element (232, 234) is embedded.