DE10392948B4 - Rotatable drive and switching mechanism with this rotatable drive - Google Patents

Abstract

A rotary drive comprising a drive pinion (110) and a gear segment (120) meshingly engaging the drive pinion (110), a member mounted for rotation coaxial with the gear segment (120), spring means (148) acting on either the gear segment (120) or the element is mounted, an abutment (134,146) on the other of gear segment (120) and element, which is in engagement with the spring means (148) to the element in a central position relative to the gear segment ( 120), the spring means (148) exerting a restoring force in the direction of the central position upon relative movement of the element with respect to the gear segment (120), and stop means (154) provided for relative movement of the element with respect to the gear segment (120) in either of the two directions away from the central position, the element being drivably connected to an output shaft (80), the ele a spring carrier (140), the spring being mounted relative to the spring carrier (140) and the abutment (134) being provided on the gear segment (120) for engaging the spring means (148), and wherein the spring means (148 ), The spring means (148) having a pair of legs (150), the legs (150) in turn engaging the abutments (146) on the spring carrier (140) and the legs (150) circumferentially both between the abutment (134) on the gear segment (120) and between the abutments (146) on the spring carrier (140) are arranged.

Description

The present invention relates to rotatable drive means, and more particularly to rotatable drive means such as are used in gearshift mechanisms when limited angular movement is required, the drive means comprising a drive pinion meshing with a gear segment.

In such rotatable drives, there is often a requirement to provide resilience in the drive to limit the loads applied to the components driven by the rotatable drive means or to provide means for preloading such components.

So far, this has been achieved by providing elasticity elements in the drive between the pinion and the means, for example the electric motor, through which the pinion is driven. Such elasticity elements typically comprise a pair of elastic-action discs acting therebetween US 6 003 395 A . US Pat. No. 6,220,109 B1 and US 6,003,649 A whose disclosure contents are included in the disclosure of the present application for the purpose of reference.

A drehbahrer drive for a transmission operation with an elasticity within a gear segment in the torque flow is out of DE 197 58 713 A1 known. Similar structures with segment gear and drive pinion are also from the DE 198 51 466 A1 and the DE 195 25 840 C1 while known from the DE 197 13 423 A1 the use of a leg spring as elasticity suggests.

The EP 0 620 388 A1 shows a Schaltaktorik in which the shift finger can slide axially on the shift shaft, while it is fixed in the direction of rotation or pivoting on the shaft.

The present invention has an alternative to the sand of the art construction of a rotary drive according to the features of claim 1 and a switching mechanism for a multi-stage transmission with the features of claim 10, further advantageous embodiments are described in the dependent claims.

The present invention provides a rotatable drive in which the elastic element is incorporated in the gear segment. The elastic element of the present invention also allows preloading of the elastic element and control of the deflection.

According to one aspect of the present invention, a rotatable drive includes a drive pinion and a gear segment meshing with the drive pinion, a member mounted for rotation coaxial with the drive segment, a spring means mounted on either the gear segment or the element Abutment on the other of gear segment and element which engages with the spring means to bias the element in a central position relative to the gear segment, wherein the spring means a restoring force in the direction of the central position during relative movement of the element with respect to the Gear member exerts, and a stop means, which is provided to limit the relative movement of the element with respect to the gear segment in each of the two directions away from the central position, said element being drivably connected to an output shaft.

In accordance with the present invention, relative movement of the member relative to the gear segment under the influence of the spring provides resilience to limit the load applied to the driven components and / or to bias the components.

According to a preferred embodiment of the present invention, the element and the spring means are mounted within a cavity formed in the gear segment, thereby producing a compact arrangement, which may be conventionally incorporated, for example, in a gear selection mechanism of a motor vehicle.

• 1 schematisch eine Darstellung eines Getriebes eines Kraftfahrzeugs darstellt;
• 2 einen Gangschaltmechanismus für das Getriebe, das in 1 dargestellt ist, zeigt, welches einen drehbaren Antriebsmechanismus gemäß der vorliegenden Erfindung einsetzt;
• 3 eine auseinandergezogene Ansicht des Mechanismus ist, der in 2 dargestellt ist;
• 4 eine Ansicht des Zahnradsegments des Mechanismus, dargestellt in 2, ist;
• 5 ein Schnittaufriss von hinten durch den Mechanismus entlang der Linie X - X aus 2 ist, welcher den Mechanismus in einer ersten Position zeigt;
• 5a eine vergrößerte Ansicht des eingekreisten Abschnitts aus 5 ist;
• 6 ein Schnittaufriss von hinten durch den Mechanismus entlang der Linie X - X aus 2 ist, welcher den Mechanismus in einer zweiten Position zeigt;
• 6a eine vergrößerte Ansicht des eingekreisten Abschnitts aus 6 ist;
• 7 ein Schnittaufriss von hinten durch den Mechanismus entlang der Linie X - X aus 2 ist, welcher den Mechanismus in einer dritten Position zeigt; und
• 7a eine vergrößerte Ansicht des eingekreisten Abschnitts aus 7 ist.

An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: -

• 1 schematically illustrates a representation of a transmission of a motor vehicle;
• 2 a gearshift mechanism for the transmission, which in 1 is shown, which uses a rotatable drive mechanism according to the present invention;
• 3 an exploded view of the mechanism that is in 2 is shown;
• 4 a view of the gear segment of the mechanism, shown in FIG 2 , is;
• 5 a Schnittaufriss from behind through the mechanism along the line X - X out 2 which shows the mechanism in a first position;
• 5a an enlarged view of the circled section 5 is;
• 6 a Schnittaufriss from behind through the mechanism along the line X - X out 2 which shows the mechanism in a second position;
• 6a an enlarged view of the circled section 6 is;
• 7 a Schnittaufriss from behind through the mechanism along the line X - X out 2 which shows the mechanism in a third position; and
• 7a an enlarged view of the circled section 7 is.

In the transmission system, which in 1 is shown, transmits a clutch 14 when engaged, torque between the output shaft of the engine 10 and a drive shaft 20 a gearbox 12 , The engagement of the clutch 14 is through the following controlled clutch cylinder 16 controlled in a conventional manner.

The drive shaft 20 has six gears 22 . 23 . 24 . 25 . 26 and 27 who are mounted on it for rotation with her. The gears 22 . 23 . 24 . 25 and 26 comb with the gears 32 . 33 . 34 . 35 respectively 36 and gear 27 meshes with gear 37 by means of an intermediate gear 38 , The gears 32 . 33 . 34 . 35 . 36 and 37 are on a countershaft 40 attached, which are parallel to but spaced from the drive shaft 20 lies. The gears 32 . 33 . 34 . 35 . 36 and 37 are on the counterwave 40 attached for rotation relative to this. The gears 32 and 37 are selected for rotation with the countershaft 40 by means of a synchronous switching unit 42 indented; the gears 33 and 34 are selected for rotation with the countershaft 40 by means of a synchronous switching unit 44 indented; and the gears 35 and 36 are selected for rotation with the countershaft 40 by means of a synchronous shift unit 46 indented.

The gears 22 and 32 are tuned to provide a first gear; the gears 23 and 33 a second course; the gears 24 and 34 a third gear; the gears 25 and 35 a fourth gear; the gears 26 and 36 a sixth gear; while the intermediate gear 38 the direction of rotation reverses, leaving the gears 27 and 37 to provide a reverse gear.

The countershaft 40 is for drive purposes with an output shaft 50 from the transmission 12 by means of the gears 39 and 52 connected.

The synchronous switching units 42 . 44 and 46 be through the rulers 70 . 72 respectively 74 controlled, with axial movement of the shift rulers 70 . 72 and 74 the synchronous switching units 42 . 44 respectively 46 axially to the countershaft 40 emotional. In this way, the synchronous switching unit 42 (as in 1 shown) are moved to the left to the gear 37 with the countershaft 40 engage, whereby the reverse gear is engaged; or moved to the right to the gear 32 with the countershaft 40 engage, whereby the first gear is engaged. The synchronous switching unit 44 can turn left to the gear 33 with the countershaft 40 retract to engage second gear, or move to the right to the gear 34 with the countershaft 40 retract to engage third gear. The synchronous switching unit 46 can turn left to the gear 35 with the countershaft 40 retract to engage fourth gear, or move to the right to the gear 36 with the countershaft 40 retract to engage fifth gear.

As in 2 shown, assigns each of the rulers 70 . 72 and 74 a notch 76 on, with the notches 76 in the switching rulers 70 . 72 and 74 in the transverse direction of the switching rulers 70 . 72 and 74 are aligned when the synchronous switching units 42 . 44 and 46 in a central, neutral position, in which none of the gears 32 , 37; 33, 34; or 35, 36, of each respective synchronous switching unit 42 . 44 and 46 attached, with the countershaft 40 is indented. The scores 76 be through a shift finger 78 engaged, which is displaceable on a shaft 80 where the axis of the shaft 80 transverse to the longitudinal axis of the shift rulers 70 . 72 and 74 is appropriate. The wave 80 is rectangular in cross-section, so that rotation thereof is the shift finger 78 in a plane parallel to the longitudinal axes of the shift rulers 70 . 72 and 74 rotates, with the rotation of the shift finger 78 in that the switching ruler with which it engages causes to move axially in one direction or the other depending on the direction of rotation.

One means, as WO 02/066 870 A1 shows, the disclosure of which is included in the disclosure of the present application for the purpose of reference thereto, is for the movement of the shift finger 78 axially to the shaft 80 provided so that it axially with one of the switching rulers 70 . 72 and 74 can be aligned.

As in 2 to 7 represented, the wave becomes 80 rotated in one direction or the other by means of a drive mechanism which is a drive pinion 110 which is drivable with a drive means, for example an electric motor, through the drive shaft 112 connected is.

The drive pinion 110 meshes with a gear segment 120 to a limited angular rotation of a shaft 80 to provide in every direction.

The gear segment 120 includes a toothed section 122 which is concentric with an axial bore 124 is. The gear segment 120 also defines an axially extending cavity 126 of segmental cross-section. The opening 128 the excavation 126 is partially circular, being coaxial with the bore 124 is.

The outer curved wall 130 the excavation 126 has a circumferential groove 132 on its inner diameter, with the central portion of the walls containing the groove 132 define, is removed by two pairs of abutments 134 to define the abutment 134 each pair of abutments adjacent to the axially inner and outer boundaries of the cavity 126 are arranged.

A spring carrier 140 has a pin training 142 on which rotates in the hole 124 of the gear segment 120 plugged. A segmental flange formation 144 is at the end of the pin 142 provided, wherein the segment-shaped flange 144 is dimensioned to within the cavity 126 to be arranged. The angular dimension of the segment-shaped flange 144 is less than that of the excavation 126 so as to provide relative rotation of the spring carrier 140 with respect to the gear segment 120 permit.

A pair of abutments 146 are on the spring carrier 140 provided, wherein a U-shaped spring 148 between the abutments 146 is arranged and the spring 148 is compressed with a predetermined bias voltage.

The abutments 146 extend into the groove 132 in the hollow 126 and correspond in the angular position of the abutments 134 passing through the walls of the groove 132 be formed. That's how the thighs grip 150 the feather 148 if they are in a central position, as in 5 shown in the abutment 146 on the spring carrier 140 and the abutments 134 on the gear segment 120 one.

To the assembly of the spring carrier 140 in the hollow 126 to allow, is the upper wall, which is the groove 132 defined, at one end 136 cut away, so when the spring carrier 140 to that end 136 is turned, an abutment 146 with the cut-out area at the end 136 is aligned, while the other abutment 146 is aligned with the central cut-out portion, whereby the spring carrier 140 axially into the cavity 126 can be inserted and then rotated so that the abutment 146 in the groove 132 intervention.

An end plate 152 is designed to be the spring carrier 140 to attach to the spring 148 to hold in position. The end plate 152 has a pair of abutments 154 on which on the outer surfaces of the abutment 146 on the spring carrier 140 intervene so that the abutment 154 in the radial walls 156 the excavation 126 engage, to the angular rotation of the spring carrier 140 in relation to the gear segment 120 to limit.

The wave 80 engages drive capable in a suitably shaped shoe 162 in the cone training 142 of the spring carrier 140 to turn with this one.

To the switching rulers 70 . 72 and 74 to move axially to one of the gears 32 . 37 ; 33, 34; or 35, 36, which are assigned to these, engage, is the shift finger 78 with the corresponding ruler 70 . 72 or 74 aligned. The shift finger 78 is then in one or the other direction by means of the drive pinion 110 and the gear segment 120 turned to the switching ruler 70 . 72 , 74 in the appropriate direction to move to engage the required gear, which is assigned to this.

The U-shaped spring 148 is between the abutments 146 on the spring carrier 140 biased so that at low input torque the drive from the gear segment 120 , the abutments 134 and the thighs of the spring 148 on the abutment 146 on the spring carrier 140 and thereby on the wave 80 without load-induced bending of the spring 148 is transmitted.

However, if the torque applied to the gear segment 120 is applied over the bias of the "U" spring 148 increases, pushes the gear segment 120 the "U" spring 148 together, representing a relative movement between the gear segment 120 and the spring carrier 140 causes, as in 6 shown. The relative movement between the gear segment 120 and the spring carrier 140 is through the intervention of the abutment 154 against the wall of the excavation 126 limited, as in 7 shown. The compression of the spring 148 thereby springs the intervention of synchronous switching units 42 . 44 and 46 which avoids damage by applying excessive loads to them.

Various modifications may be made without departing from the invention, for example, while the invention has been described with reference to a gear selection mechanism, the drive may also be used in other applications where limited angled reciprocating drives, such as clutch actuators , required are.

While in the embodiment described with reference to the accompanying drawings, the spring 148 in terms of the wave 80 is attached and by the movement of the gear segment 120 is bent, one will appreciate that the spring 148 Alternatively, it may be mounted on the gear segment 120 so as to be responsive to the movement of the shaft 80 is bent.

Further, in the above embodiment, fixed stops by the abutments 154 As an alternative, adjustable stops, for example setscrews, provided in threaded holes through the abutment walls 156 may be provided 146 are arranged.

The wave 80 may be of any non-circular cross-section, which axial movement of the shift finger 78 allows, but rotatable movement transfers to this. For example, the wave 80 in that it has a rectangular cross section, a hexagonal cross section, a grooved or non-circular cross section with a flattening extending axially thereon.

While the above embodiment of the invention uses the elasticity in the drive mechanism to cushion loads acting on the components driven by it, the resilience may alternatively or additionally be employed to bias the components into engagement.

LIST OF REFERENCE NUMBERS

10

engine

12

transmission

14

clutch

16

clutch cylinder

20

drive shaft

22

gear

23

gear

24

gear

25

gear

26

gear

27

gear

32

gear

33

gear

34

gear

35

gear

36

gear

37

gear

38

intermediate gear

39

gear

40

Countershaft

42

Synchronous switching unit

44

Synchronous switching unit

46

Synchronous switching unit

50

output shaft

52

gear

70

shift rails

72

shift rails

74

shift rails

76

score

78

shift finger

80

wave

110

pinion

112

drive shaft

120

gear segment

122

section

124

drilling

126

erosion

128

opening

130

wall

132

circumferential groove

134

abutment

136

The End

140

spring support

142

plug formation

144

flange formation

146

abutment

148

feather

150

leg

152

endplate

154

abutment

156

walls

162

shoe

Claims (12)

A rotary drive comprising a drive pinion (110) and a gear segment (120) meshingly engaging the drive pinion (110), a member that is coaxial with the gear segment (120) for rotation. a spring means (148) mounted on either the gear segment (120) or the member, an abutment (134, 146) on the other of the gear segment (120) and member engaging the spring means (148) to bias the element into a central position relative to the gear segment (120), the spring means (148) exerting a restoring force in the central position upon relative movement of the element with respect to the gear segment (120), and stop means (154 ) provided to limit the relative movement of the member with respect to the gear segment (120) in either of the two directions away from the central position, the member being drivably connected to an output shaft (80), the member comprising Spring carrier (140), wherein the spring is mounted with respect to the spring carrier (140) and the abutment (134) on the gear segment (120) for the engagement of the spring means (14 8) is provided, and wherein the spring means (148) is formed "U" -shaped, wherein the spring means (148) comprises a pair of legs (150), wherein the legs (150) in turn in the abutment (146) on the spring carrier (140) engage and the legs (150) are arranged circumferentially both between the abutment (134) on the gear segment (120) and between the abutments (146) on the spring carrier (140). Rotatable drive to Claim 1 in that the spring means (148) is biased to a predetermined value when the legs (150) engage the abutments (146) on the spring carrier (140). Rotatable drive to Claim 1 or 2 in that the spring carrier (140) has a flange formation (144) of segment portions, the flange formation (144) being disposed within an arcuate cavity (126) provided in the gear segment (120), the angular extent of the cavity (126). greater than that of the flange formation (144) to allow limited rotation of the flange formation (144) in the cavity (126). Rotatable drive to Claim 3 in that an outer curved wall (130) of the cavity (126) has a circumferential groove formation (132) on its inner diameter, with a central portion of the walls defining the groove formation (132) being removed by two pairs of abutments ( 134), the abutments (134) engaging the ends of the legs (150) of the spring means (148), an abutment (134) of each pair on each side of the abutments (146) on the spring carrier (140). Rotatable drive to Claim 4 in that the abutments (146) on the spring carrier (140) engage in the Umfangsnutausformung (132). Rotatable drive to Claim 5 in that an end portion of the outer wall defining the groove formation (132) is removed to allow the axial insertion of the spring carrier (140) into the cavity (126) such that the abutments (146) engage in the groove formation (132 ) intervene. Rotatable drive after each of the Claims 3 to 6 in that an end plate (152) is attached to the spring carrier (140) to retain the spring means (148). Rotatable drive to Claim 7 in that a pair of abutments (154) on the end plate (152) are adapted to engage the radial walls of the cavity (126) to limit relative rotation of the spring carrier (140) relative to the gear portion (120). Rotatable drive to Claim 8 in that the abutments (154) on the end plate (152) engage the outer sides of the abutments (146) on the spring carrier (140). A multi-stage transmission shift mechanism comprising a plurality of shift rulers (70, 72, 74), a shift finger (78) adapted to engage a notch (76) in each of the shift rulers (70, 72, 74), means being provided to translate the shift finger (78) across the shift rulers (70, 72, 74) to align the shift finger (78) with a notch (76) in one of the shift rulers (70, 72, 74) to bring, and a rotatable drive, as in each of the Claims 1 to 9 in order to rotate the shift finger (78) in one direction or the other and thereby to move the shift ruler (70,72,74) axially in one or the other direction to a gear which the shift ruler (70,72,74 ) is enclosed. Switching mechanism after Claim 10 in that a shaft (80) of the rotatable drive is disposed transversely of the shift rulers (70, 72, 74), the shift finger (78) being mounted on the shaft (80) so as to slide thereon but with respect thereto is fixed in the direction of rotation. Switching mechanism after Claim 11 in which the shaft (80) is of non-circular cross-section.

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