EP2375055A2 - Covering ring for starter device - Google Patents

Abstract

The seal has a rubber bellow (214) provided for sealing an inner area of a toe-in actuator and fastened to a housing (156) by using a deformable covering ring (210), where the rubber bellow has a cylindrical middle section. The covering ring is accommodated in a recess of a drive end bearing housing (19). The recess is graded in such a manner that movement possibility of the ring in a direction is limited by a circumferential surface between two layers of the recess, where breadth of the ring is smaller than the breadth of a collar for accommodating the rubber bellow at the housing.

Description

State of the art

For starting internal combustion engines drives are used, which are fed with a separate from the fuel supply power supply. Most DC motors are used for this purpose, the drive pinion is first engaged in the ring gear of the internal combustion engine, then to spin the internal combustion engine. This happens, for example, by means of starting devices which operate in accordance with the push-screw drive principle. After the end of the starting process, the drive pinion moves back out of the ring gear of the internal combustion engine.

DE 101 24 506 A1 refers to a starter for a motor vehicle. The starter comprises a hollow housing, a Vorspuraktuator containing a magnetic switch and a rotatably mounted in a transition region between the hollow housing and Vorspuraktuator engagement lever for the coupling of the starter motor to the internal combustion engine. There is provided a seal against ingress of contaminants and moisture in the Vorspuraktuator. The seal is formed by a rubber membrane connected to the housing walls within the transition region between the hollow housing and the Vorspuraktuator.

In starting devices which are used on motor vehicles, among other starting devices are used which have a rubber bellows in the region of Vorspuraktuators. The rubber bellows provides a seal which ensures that the starter relay is protected against ingress of water. This in turn makes it possible to obstruct the starting device to engine positions, which may be the starter relay with a lot of water spray, which at appropriate Weather is whirled up by the wheels, can come into contact. As a rule, the rubber bellows performing the sealing is firmly fixed between the toe-in actuator and the drive bearing. By means of a cover plate is produced between rubber bellows and a drive bearing a press bond.

The press combination of drive bearing, cover plate, rubber bellows and toe-in actuator places high demands on assembly in the series production of starting devices. It is desirable to dispense with the cover ring, but this entails the risk that penetration of water into the toe-in actuator becomes more likely. The cover ring, however, must be aligned several times in the assembly operations to be carried out as part of the assembly of the starting device, so that the drive bearing (A-bearing) and the Vorspuraktuator can be connected to each other via appropriately configured screws, such as countersunk screws. A twist of the cover has the consequence that the screws can not be screwed into the housing. For the reasons mentioned above, from the point of view of rational assembly, it is desirable to reduce or rationalize the cover ring and the associated alignment or assembly operations. Solutions that include the aforementioned cover ring within the press assembly can be difficult to implement in a fully automatic assembly.

Presentation of the invention

According to the invention, a sliding on a rubber bellows cover ring is proposed, which covers a rubber bellows in the region of a covenant, and the elastic rubber material deformed so that a linearly movable armature of the relay is sealed to the outside against moisture. Due to the lack of bore holes in the invention proposed cover ring eliminates an alignment thereof with respect to a drive bearing or holes in the housing of the Vorspuraktuators. This means that the cover ring proposed according to the invention can be installed independently of position.

In a particularly advantageous manner, the cover ring proposed according to the invention is simply pulled over the rubber bellows and then this is installed in a seat surface of the drive bearing. The cover ring is between braced the drive bearing and the housing of the relay via a number of helical fasteners. At the same time the cover presses the rubber bellows against the front side of the housing, whereby a frictional connection between the rubber bellows and the housing is formed. The inventively proposed cover ring is, for example, form-fitting manner in a seat provided for this purpose of the drive bearing, which is formed on the end face of the drive bearing, which assigns the housing. The rubber bellows, which is deformed over the cover ring proposed according to the invention, has in the region of its opening an increase or a circumferentially extending, collar-like material accumulation. In the assembled state, this collar-shaped approach or the accumulation of material is deformed on the open side of the rubber bellows, so that the cover ring and rubber bellows are braced against each other.

The cover ring is constructed symmetrically, whereby a position-independent supply is possible within a fully automated production.

Brief description of the drawings

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

Figur 1

eine Schnittdarstellung einer elektrischen Maschine, insbesondere einer Startvorrichtung samt Vorspuraktuator, Andrehritzel und Einrückmimik,

Figur 2

das Fügen des erfindungsgemäß vorgeschlagenen Abdeckrings in das Antriebslager,

Figur 3

einen Schnitt durch das in Figur 2 perspektivisch wiedergegebene Antriebslager,

Figur 4

eine Detailansicht des verbauten Gummibalges fixiert durch den erfindungsgemäß vorgeschlagenen Abdeckring,

Figur 5

eine Seitenansicht des Gummibalgs,

Figur 6

einen Schnitt durch das Relais zur Betätigung einer elektrischen Maschine, wie zum Beispiel einer Startvorrichtung für eine Verbrennungskraftmaschine.

It shows:

FIG. 1

a sectional view of an electric machine, in particular a starting device including Vorspuraktuator, andrehritzel and Einrückmimik,

FIG. 2

the joining of the inventively proposed cover ring in the drive bearing,

FIG. 3

a cut through the in FIG. 2 in perspective reproduced drive bearing,

FIG. 4

a detailed view of the installed rubber bellows fixed by the inventively proposed cover ring,

FIG. 5

a side view of the rubber bellows,

FIG. 6

a section through the relay for actuating an electric machine, such as a starting device for an internal combustion engine.

variants

FIG. 1 shows a starting device in a longitudinal section. In FIG. 1 a starter 10 is shown. This is designed as a starting device in which the starting pinion is surrounded by a part of the housing of the starting device. The following explanations also apply to a freely ejecting starting device, ie for a starting device in which the starting pinion is fully exposed after actuation of the Vorspuraktuators.

In the FIG. 1 illustrated starting device 10 has, for example, a starter motor 13 and a Vorspuraktuator 16. The starter motor 13 and the Vorspuraktuator 16 are attached to a common drive end plate 19. The starter motor 13 serves to drive a starter pinion 22 when it is meshed in the ring gear of an internal combustion engine not shown here.

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. At the end of the drive shaft 44 facing away from the starting pinion 22, a commutator 52 is further attached, which is constructed, inter alia, of individual commutator bars 55. The commutator bars 55 are so electrically connected in a known manner with the armature winding 49 that sets when energizing the commutator fins 55 by carbon brushes 58, a rotational movement of the armature 37 in the pole tube 38. A arranged between the Vorspuraktuator 16 and the starter motor 13 power supply 61 supplies both the brushes 58 and the field winding 34 in the on state with electricity. 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 Kommutatorlagerdeckel 70. The commutator bearing cover 70 in turn is fastened in the drive end shield 19 by means of tie rods 73, which are arranged distributed over the circumference of the pole tube 28, for example screws, for example two, three or four pieces. In this case, the pole tube 28 is supported on the drive end plate 19 and the commutator bearing cover 70 in turn on the pole tube 28th

As seen in the drive direction, the armature 37 is adjoined by a sun gear 80, which is part of a planetary gear 83. The sun gear 80 is surrounded by a plurality of planet wheels 86, usually 3 planet wheels 86, which are supported by means of roller 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 wheels 86 are adjoined by a planetary carrier 98, in which the axle journals 92 are accommodated. The planet carrier 98 in turn is mounted in an intermediate bearing 101 and a slide bearing 104 arranged therein. 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 has a further shaft journal 110, which is also received in a sliding bearing 116. The sliding bearing 113 is received in a central bore of the planetary carrier 98. The planetary carrier 98 is integrally connected to the output shaft 116. The output shaft 116 is supported with its end 119 facing away from the intermediate bearing 101 in a further bearing 122, the drive-side bearing (A-bearing). The output shaft 116 is divided into several sections. Thus, the section which is arranged in the sliding bearing 104 of the intermediate bearing 101 is followed by a section with a degree of teeth 125 (internal toothing), which is part of a shaft-hub connection. This shaft-hub connection 128 in this case allows the axial, linear 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 (Richtgesperre) further comprises an inner ring 140 which is disposed radially within the outer ring 132. Between the inner ring 140 and the outer ring 132, the clamping body 138 are arranged. The clamp bodies 138, in cooperation with the inner and outer rings, prevent relative rotation between the outer ring 132 and the inner ring 140 in a second direction. The freewheel 137 thus allows a relative movement between the inner ring 140 and the outer ring 132 only in one direction. In this embodiment, the inner ring 140 is formed integrally with the starter pinion 22 and the helical teeth 143 (external helical teeth).

For the sake of completeness, the single-track mechanism will be discussed below. The Vorspuraktuator 16 has a bolt 150 which is an electrical contact and connected to the positive terminal of an electric starter battery, the FIG. 1 not shown, is connected. The bolt 150 is performed by a lid 153. The lid 153 closes off a housing 156, which is fastened to the drive end shield 19 by means of a plurality of fastening elements 159, for example screws. In the Vorspuraktuator 16 a pull-in winding 162 and a holding coil 165 are further arranged. The pull-in winding 162 and the holding winding 165 each cause an electromagnetic field in the switched-on state, which flows through both the housing 156 (made of electromagnetically conductive material), a linearly movable armature 168 and an armature return 171. The armature 168 carries a push rod 174, which is moved in the direction of linear retraction of the armature 168 in the direction of a switching pin 177. With this movement of the push rod 174 to the switching pin 177 this is moved from its rest position in the direction of two contacts 180, 181, so that attached to the contacts 180, 181, at the end of the switching pin 177 contact bridge 184 both contacts 180, 181 electrically combines. As a result, electrical power is conducted from the bolt 50 across the contact bridge 184 to the power supply 61 and thus to the carbon brushes 58. The starter motor 13 is energized.

The Vorspuraktuator 16 and the armature 168 also has the task, with a tension member 187 to move in the drive bearing plate 19 rotatably arranged lever 190 to move. The lever 190, usually designed as a fork lever, engages with two "tines", not shown here, on its outer circumference two discs 193, 194, to an entrained between these driver ring 197 for freewheel 137 back against the resistance of the spring 200 to move and thereby einzura the starter pinion 22 in the ring gear 25.

FIG. 2 shows in perspective representation of the Vorspuraktuator assigning plan page of the drive end shield. From the illustration according to FIG. 2 shows that a cover ring 210 is used, which is slightly bulged to both end faces radially outward (funnel-like). By means of in FIG. 2 In perspective shown cover ring 210 is a rubber bellows (see FIG. 5 ), which is a seal of the interior of the Vorspuraktuators 16, deformed and fixed. From the illustration according to FIG. 2 shows that the cover ring 210 is embedded in a specially machined to its inclusion seat 212. The holes 206 through which the in FIG. 1 shown fasteners 159 are staked in the drive bearing plate 19 in a 120 ° division with respect to each other. A plan side, which is opposite to the housing 156 of the Vorspuraktuators 16 is shown in the illustration FIG. 2 identified by reference numeral 208.

The cover ring 210, as seen from the perspective view in FIG. 2 shows, has a largest outer diameter of 35.5 mm (minus 0.25 mm tolerance). The largest outer diameter must fit the seat 212 in the drive end plate 19. The seat 212 on the drive bearing 19 is machined to a diameter of 35.8 mm, so that sets a minimum clearance of 0.3 mm between the cover ring 210 and the seat 212 in the drive bearing plate 19.

The smallest diameter of the cover ring 210 as shown in FIG FIG. 2 is at least 33 mm. This minimum diameter ensures that a rubber bellows (see illustration in accordance with FIG. 5 ) can be fixed on the shoulder of the housing 156. The largest diameter of the shoulder on the housing 156 has a diameter of 30.5 mm. At a thickness of in FIG. 5 shown Gummibalgs of a maximum of 1.1 mm results in a minimum allowable game in the order of 0.3 mm between the cover 210 and the rubber bellows in accordance FIG. 5 ,

In order to improve the joining of the rubber bellows with the cover disk 210, insertion bevels at an angle of 30 ° are provided on the cover ring on both end faces educated. Due to the slope of the rubber material of the rubber bellows as shown in FIG. 5 completely displaced under the cover 210.

The bevel formed on the circumference of both end faces of the cover ring 210 is formed in a length of 1.5 mm (plus / minus 0.5 mm). This length results from the helix angle of the slope (here 30 °). The tolerance of plus / minus 0.5 mm ensures that the rubber material of the in FIG. 5 shown Gummibalgs can be displaced under the cover 210. Otherwise there would be a risk that the joining forces during assembly too large or the rubber material undergoes plastic damage.

The overall width of the cover ring 210 as shown in FIG FIG. 2 is on the order of 5 mm plus / minus 0.2 mm. The overall width of the cover ring 210 is smaller than the paragraph, ie the seat 212 in the drive end plate 19. This ensures that there is always a gap of at least 0.2 mm between the end face of the relay and the cover plate 210. Exceeding this value has the consequence that the pressure between the cover ring 212 and the rubber material of the rubber bellows is too large or that the cover ring 210 rests against the relay end face and a gap between the drive end plate 19 and the housing 156 opens. In this case, the electric current can not be transmitted via the drive end plate 19 to the Vorspuraktuator 16. This is important insofar as the housing 156 is, for example, a part of the electrical path between the intake winding 162 arranged in the housing 156 and the holding winding 165 and the drive end shield 19, which is connected to a negative terminal of the starter battery.

A circumferential support of the cover ring 210 is executed in the drive end plate 19 in 0.5 mm plus 0.5 / minus 0.3 mm. Since the circulating forces are very low, the heel can be in a range between 0.2 mm and 1 mm.

The in FIG. 2 illustrated cover ring 210 is burr-free design, otherwise there is a risk that the rubber material of in FIG. 5 rubber bellows would be damaged.

There is thus disclosed a seal for a Vorspuraktuator 16, in particular for a contactor of a starting device 10 for internal combustion engines, wherein the Vorspuraktuator 16 comprises a movable housing 156 in a 156 anchor, wherein the interior of the Vorspuraktuators 16 sealing rubber bellows 214 by means of a deforming this cover ring 210, which is received in a recess 213 or a cavity of a drive bearing plate 19, is secured to the housing 156, wherein the recess 213 or the cavity is stepped such that by a transition surface 215 between two stages 217 and 219 of the recess 213 a Movement possibility of the cover ring 210 in one direction - here in the direction of the housing 156 away toward the open end of the shoulder - is limited.

FIG. 3 shows a section through the drive end shield with incorporated seat for receiving the cover ring proposed according to the invention. From the sectional view according to FIG. 3 shows that the holes 206 through which the fasteners 159 extend, open in the plan side 208 of the drive end plate 19 and, for example, as in FIG. 2 represented, may be oriented in a 120 ° pitch to each other. With reference numeral 218, the axis of the Vorspuraktuators 16 is designated, which in the sectional view according to FIG. 3 not shown.

FIG. 4 shows that a helically shaped fastening element 159 is inserted into the bore 201 of the drive bearing plate 19, where this in an in FIG. 4 only indicated thread of the housing 156 is screwed. In the circumferential trained seat surface 212 on the flat side 208 of the drive bearing plate 19 is the both sides bulged, insertion chamfer having cover ring 210. The cover 210 in turn is on the lateral surface of a rubber bellows 214 (see FIG. 5 ) postponed. As a result, a bead-shaped material accumulation, which is arranged at the open end of the rubber bellows 214 (see position 216), is deformed such that the rubber bellows 214 rests with its open end, ie its inner circumferential surface, on a shoulder of the housing 156. The on the a conical having Rubber bellows 214 deferred cover deforms the accumulation of material, which represents the collar 216 such that the rubber bellows 214 is a seal of the interior of the Vorspuraktuators 16, can be mounted on the housing 156 and fixed during attachment, ie when tightening the fasteners 159.

The representation according to FIG. 5 the rubber bellows can be removed. From the illustration according to FIG. 5 shows that the lateral surface of the rubber bellows 214, starting from the circumferentially formed collar 216 on the open side has a slight conicity. As a result, the burr-free cover ring can be easily pushed onto the rubber bellows 214, without damaging the rubber material.

The representation according to FIG. 6 It can be seen that the fastening elements 159 are bolted through their respective bores 206 in the drive bearing plate 19 in the housing 156. The rubber bellows 214, from the cover ring 210 (see illustration according to FIGS FIGS. 4 and 5 ) is secured on the shoulder of the housing 156 and is fixed when tightening the fasteners 159 with a corresponding torque. The linearly movable armature 168 inside the housing 156 is encapsulated by the rubber bellows 214 to the outside, that is sealed against media influences. The linearly movable armature 168 actuates the push rod 174, which in turn encloses the lever 190 and this for engagement or disengagement of the Andrehritzels 22 (see FIG. 1 ).

Coaxially to the push rod 174 is located inside the Vorspuraktuators 16 of the shift pin 177th

Claims (10)

Seal for a Vorspuraktuator (16), in particular an engagement relay of a starting device (10) for internal combustion engines, wherein the Vorspuraktuator (16) in a housing (156) movable armature (168), wherein a the inside of the Vorspuraktuators (16) sealing rubber bellows (214) by means of this deforming cover ring (210) which is received in a recess (213) of a drive bearing plate (19), on the housing (156) is fastened, characterized in that the recess (213) is stepped such that a transition surface (215) between two stages (217, 219) of the recess (213) is limited a possibility of movement of the cover ring (210) in one direction. Seal for a Vorspuraktuator (16) according to claim 1, characterized in that the lateral surface of the rubber bellows (214) has a taper. Seal for a Vorspuraktuator (16) according to claim 1, characterized in that the rubber bellows (214) has at its open ends a collar-shaped material accumulation (210). Seal for a Vorspuraktuator (16) according to claim 1, characterized in that in the assembled state of the cover ring (210) this elastically deforms the material accumulation (210) at the open end of the rubber bellows (214). Seal for a Vorspuraktuator (16) according to claim 1, characterized in that the cover ring (210) on its the outer surface of the rubber bellows (214) facing side and at least one mounting bevel (220). Seal for a Vorspuraktuator (16) according to claim 1, characterized in that a step (217) as a seat (212) in the drive bearing plate (19) of the starting device (10) is executed and the cover ring (210) contacts the seat surface (212). Seal for a Vorspuraktuator (16) according to one of the preceding claims, characterized in that the open end of the rubber bellows (214) is received on a provided on the drive end shield (19) opposite end of the housing (156) shoulder. Seal for a Vorspuraktuator (16) according to one or more of the preceding claims, characterized in that the width of the cover ring (210) is smaller than the width of the shoulder for receiving the rubber bellows (214) on the housing (156). Seal for a Vorspuraktuator (16) according to one of the preceding claims, characterized in that the rubber bellows (214) has a cylindrical central portion (222) on which the cover ring (210) rests, and adjacent to a collar (216) of the rubber bellows ( 214) is formed. Starting device with a drive bearing plate (19) and a Vorspuraktuator (16) attached thereto and with a seal of the Vorspuraktuators (16) according to any one of the preceding claims.

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