DE102019216566B3 - Actuating device for actuating a clutch-controlled transfer case and clutch-controlled transfer case - Google Patents

Abstract

Actuating device (1) for actuating a clutch-controlled transfer case (2) with a two-stage intermediate gear (3) comprising an electric motor and at least one component (5) that can be rotated directly or indirectly via the electric motor, with two scenes on the rotatable component (5), namely one first gate (6) and a second gate (7) are arranged, which are designed and arranged in such a way that they each represent at least one pressurizable stop (8, 8 ') for a fixed, spring-loaded element (9) and a clutch-controlled transfer case ( 2) with such an actuating device (1).

Description

Field of invention

The present invention relates to an actuating device for actuating a clutch-controlled transfer case with a two-stage intermediate gear and a clutch-controlled transfer case equipped with such an actuating device with a two-stage intermediate gear with a first gear stage and a second gear stage, the actuating device actuating both the clutch and the two-stage intermediate gear.

State of the art

Two-stage transfer cases with an active clutch typically have an actuation system that operates a “high / low” gear and a clutch. In most cases, the actuation system is designed to be electromechanical. If the system in the vehicle is activated, for example by an “ignition on” signal, this actuation system must be initialized. This usually requires an additional rotary position sensor so that the electromechanical actuator system knows its zero position exactly. This is necessary for reasons of accuracy, but also for functional safety. The mechanical actuation system requires a certain transmission ratio in order to guarantee high forces for the clutch actuation and the "high / low" switching operation. Although the actuator motor has an internal position sensor, the absolute zero position cannot be estimated.

The document US 2015/0 006 042 A1 discloses, for example, an actuating device for actuating a clutch-controlled transfer case with a transmission, the actuating device having a drive and at least one component that can be rotated directly or indirectly via the drive. The rotatable component has two coulisse, namely a first coulisse and a second coulisse, which are designed and arranged in such a way that they each represent at least one pushable stop for a fixed, spring-loaded element.

The document US 2008/0 229 854 A1, for example, discloses a vehicle transmission comprising a first and a second main shaft which enable the switching of the power transmission from an engine, a countershaft which is connected to a drive wheel and gear trains with a plurality of gear stages, each are provided between the first and second main shafts and the countershaft. Furthermore, the vehicle transmission contains switching devices that shift the engagement and disengagement of a gear stage.

The document DE 10 2017 205 396 A1 discloses, for example, a transfer case for transmitting a drive torque from an input shaft to a primary axle and / or a secondary axle of a motor vehicle. In the case of the transfer case, the drive torque is transmitted by means of a friction clutch, via which the transmission of the drive torque from an input shaft to a first output shaft and a second output shaft can be controlled depending on its engagement state The input shaft transmits the drive torque transmitted to a first output shaft assigned to the primary axis to a second output shaft assigned to the secondary axis, the engagement state of the friction clutch being controllable by means of a rotationally driven actuator unit.

The documents are also in this context DE 10 2016 215 148 A1 and DE 195 40 522 C1 to call.

Summary of the invention

On the one hand, it is the object of the invention to provide an actuating device for actuating a clutch-controlled transfer case with a two-stage intermediate gear, which is characterized in particular by reduced costs.

On the other hand, it is the object of the invention to provide an improved clutch-controlled transfer case.

This need can be met by the subject matter of the present invention according to independent claims 1 and 5. Advantageous embodiments of the present invention are described in the dependent claims.

The actuating device according to the invention is used to actuate a clutch-controlled transfer case with a two-stage intermediate gear.

According to the invention, the actuating device has an electric motor and at least one component that can be rotated directly or indirectly via the electric motor, specifically referred to as a worm wheel, clutch bell and shift gate.

According to the present invention, two scenes are on the worm wheel, namely a first gate and a second gate, arranged. According to the invention, the two scenes are designed and arranged so that they each represent at least one stop for a fixed, spring-loaded element.
The fixed, spring-loaded element can, for example, be designed as a ball pretensioned by a spring in the direction of the scenes.

The rotatable component is preferably rotatable through 360 ° about an axis of rotation in a first direction of rotation and in a second direction of rotation opposite to the first direction of rotation.

The first link and / or the second link are preferably configured asymmetrically, specifically in such a way that a stop that can be pushed over is formed in only one direction of rotation.

As an alternative to this, the first link and / or the second link are designed mirror-symmetrically in such a way that a stop that can be pushed over is formed in both directions of rotation.

The clutch-controlled transfer case according to the invention has a clutch, a two-stage intermediate gear and an actuating device for actuating a clutch-controlled transfer case with a two-stage intermediate gear.

The clutch is used to selectively control the distribution of drive torque to at least two drive axles of a motor vehicle. The clutch is preferably designed as a friction clutch, namely as a single-disc clutch or a friction disk clutch.

According to the present invention, the two-stage intermediate transmission has a first gear stage and a second gear stage. The first switching stage is designed for road operation, for example, and the second switching stage, for example, for off-road and / or heavy train operation. Such a two-stage intermediate gear can be implemented, for example, by a planetary gear, in which, for example, by means of at least one dog clutch, one or more stages can be locked relative to each other and / or relative to a stationary housing and / or relative to a shaft, whereby the transmission ratio changes .

According to the invention, both the clutch and the two-stage intermediate gear can be switched via the actuating device. According to the invention, the actuating device has an electric motor and a component which can be rotated directly or indirectly via the electric motor, specifically referred to as a worm wheel, clutch bell and shift gate.

According to the present invention, two coulisse, namely a first coulisse and a second coulisse, are arranged on the worm wheel which can be rotated directly or indirectly via the electric motor. According to the invention, the two scenes are designed such that they each represent at least one stop for a fixed, spring-loaded element.

The electric motor can be rotated in a first direction of rotation and in a second direction of rotation opposite to the first direction of rotation.

The first link is preferably designed asymmetrically and only represents a stop that can be pushed over at the transition from a second angle of rotation range to a first angle of rotation range.

As an alternative to this, the first link can be designed mirror-symmetrically and thus represent a stop that can be pushed over both at the transition from the second angle of rotation range to the first angle of rotation range and vice versa.

Furthermore, the second link is preferably designed asymmetrically and only represents a stop that can be pushed over at the transition from a third angle of rotation range to the first angle of rotation range.

As an alternative to this, the second link can be designed mirror-symmetrically and thus represent a stop that can be pushed over both at the transition from the third angle of rotation range to the first angle of rotation range and vice versa.

Figure list

• 1 zeigt eine isometrische Ansicht eines kupplungsgesteuerten Verteilergetriebes mit einem zweistufigen Zwischengetriebe.
• 2 zeigt eine isometrische Ansicht einer beispielhaften Ausführungsvariante einer ersten Kulisse und einer zweiten Kulisse an einem über einen Elektromotor drehbaren Schneckenrad einer Betätigungsvorrichtung.
• 3 zeigt eine weitere Darstellung des in 2 gezeigten Schneckenrads.
• 4 zeigt ein Diagramm zur Darstellung von Drehwinkelbereichen eines über einen Elektromotor direkt oder indirekt drehbaren Schneckenrads einer Betätigungsvorrichtung.
• 5 zeigt schematisch die Funktion von Kulissen an einem über einen Elektromotor direkt oder indirekt drehbaren Schneckenrads in Bezug auf das in 2 dargestellte Diagramm mit einer ersten Ausführungsvariante eines federbelasteten Elements.
• 6 zeigt schematisch die Funktion von Kulissen an einer über einen Elektromotor direkt oder indirekt drehbaren Schneckenrads in Bezug auf das in 2 dargestellte Diagramm mit einer zweiten Ausführungsvariante eines federbelasteten Elements.
• 7 zeigt die Funktionsweise eines überdrückbaren Anschlags in Bezug auf eine Bestromung eines Elektromotors.

The invention is described below by way of example with reference to the drawings.

• 1 Figure 11 shows an isometric view of a clutch controlled transfer case with a two-stage intermediate gear.
• 2 shows an isometric view of an exemplary embodiment variant of a first gate and a second gate on a worm wheel of an actuating device that can be rotated via an electric motor.
• 3 shows another representation of the in 2 shown worm wheel.
• 4th FIG. 11 shows a diagram for the representation of rotational angle ranges of a worm wheel of an actuating device that can be rotated directly or indirectly via an electric motor.
• 5 shows schematically the function of scenes on a worm wheel that can be rotated directly or indirectly via an electric motor in Regarding the in 2 Diagram shown with a first variant embodiment of a spring-loaded element.
• 6 shows schematically the function of scenes on a worm wheel that can be rotated directly or indirectly via an electric motor in relation to the in 2 Diagram shown with a second variant of a spring-loaded element.
• 7th shows the mode of operation of a pushable stop in relation to the energization of an electric motor.

Detailed description of the invention

1 shows an exemplary clutch-controlled transfer case 2 with a two-stage intermediate gear 3 , which is suitable for execution with an actuator according to the invention 1 suitable.

The clutch-controlled transfer case 2 has a clutch 11 , namely a friction plate clutch, and a two-stage intermediate gear 3 with a first switching stage H and a second switching stage L. on.

Both the clutch 11 as well as the two-stage intermediate gear 3 are about the actuator 1 switchable.

The actuator 1 has an electric motor. The electric motor is operated via a worm gear with a worm shaft (not shown) and a worm wheel 14th a shift shaft 15th .

On the shift shaft 15th is a clutch cam 16 to operate the clutch 11 and a shift gate 17th to operate the two-stage intermediate gear 3 arranged.

The worm wheel 14th , the shift gate 17th as well as the coupling cam 16 each provide components that can be rotated indirectly via the electric motor 5 the actuator 1 represents. In the present embodiment according to 1 are on the worm wheel 14th two sets, namely a first set 6 and a second backdrop 7th , arranged. 2 and 3 show different views of the worm wheel 14th . The two backdrops 6 , 7th are arranged axially, but in an alternative embodiment they can also be arranged radially.

The direction specification "axial" describes a direction along or parallel to an axis of rotation 10 the rotatable component 5 . The direction indication "radial" describes a direction normal to the axis of rotation 10 the rotatable component 5 .

4th represents, in the form of an angle diagram, the control or rotation angle ranges of the electric motor and thus the rotation of the rotatable worm wheel 14th In the angle diagram there are two lines, namely a first line X and a second line Y that the rest positions of the electric motor in the corresponding switching stage H , L. of the two-stage intermediate gear 3 and two arrows, which indicate the two directions of rotation, namely the first direction of rotation I. and the second direction of rotation II , the electric motor and thus the rotatable worm wheel 14th mark, shown. At the by the lines X , Y marked rest positions, the electric motor is at a standstill. The worm wheel rotatable via the electric motor 14th is 360 ° around the axis of rotation 10 rotatable in the first direction of rotation I. and in the first direction of rotation I. opposite second direction of rotation II .

A first range of angles of rotation D1 corresponds to an angle for switching between the first switching stage H and the second switching stage L. . A second range of angles of rotation D2 corresponds to actuation of the clutch 11 in the first switching stage H and a third angle of rotation range D3 corresponds to actuation of the clutch 11 in the second switching stage L. .

The rest positions of the electric motor in the respective switching stage H , L. of the two-stage intermediate gear 3 correspond to the positions of the two scenes 6 , 7th and thus the pushable stops 8th , 8th' in 2 . The first backdrop 6 is in the first direction of rotation I. (in relation to 4th counterclockwise) is functionally effective at the transition from the second angle of rotation range D2 to the first angle of rotation range D1 arranged and the second backdrop 7th is in the second direction of rotation II (in relation to 4th clockwise) at the transition from the third angle of rotation range D3 in to the first angle of rotation range D1 arranged, ie the first backdrop 6 is in the area of the first line X arranged and the second backdrop 7th is in the area of the second line Y arranged. The first backdrop 6 and the second backdrop 7th are designed and arranged such that they each have a pushable stop 8th , 8th' for a fixed, spring-loaded element 9 represent ( 5 , 6 ). And that forms the first backdrop 6 in the first direction of rotation I. a pushable stop 8th at the transition from the second angle of rotation range D2 in the first angle of rotation range D1 and the second backdrop 7th in the second direction of rotation II a pushable stop 8th' at the transition from the third angle of rotation range D3 in the first angle of rotation range D1 out ( 4th , 5 , 6 ).

The first backdrop 6 points at the transition from the second angle of rotation range D2 in the first angle of rotation range D1 a first ramp 18th on. That first ramp 18th serves as a pushable stop 8th and enables the implementation of the main function in the first switching stage H , namely the determination of the zero position of the actuator 1 in the first switching stage H . Furthermore, the first backdrop 6 a first counter ramp 19th that is flatter than the first ramp 18th and has no function in the present embodiment. The first counter ramp 19th must in the respective direction when "switching through", ie from the first angle of rotation range D1 in the second angle of rotation range D2 in the second direction of rotation II to be driven through. The first backdrop 6 and the second backdrop 7th are mirror-symmetrical ( 5 , 6 ). The second backdrop 7th points at the transition from the third angle of rotation range D3 in the first angle of rotation range D1 a second ramp 20th on. This second ramp 20th serves as a pushable stop 8th' and enables the implementation of the main function in the second switching stage L. , namely the determination of the zero position of the actuator 1 in the second switching stage L. . Furthermore, the second backdrop 7th a second counter ramp 21st on, which is flatter than the second ramp 20th and also has no function in the present embodiment. The second counter ramp 21st must in the respective direction when "switching through", ie from the first angle of rotation range D1 in the third angle of rotation range D3 in the first direction of rotation I. to be driven through.

The pushable stops 8th , 8th' thus allow a calibration (zero point search) of the actuating device 1 during an initialization of the transfer case 2 . All that is required for this calibration is a low to average torque from the electric motor. If this torque exceeds a defined value, the respective pushable stop becomes 8th , 8th' overpressed.

5 and 6 only differ in the design of the spring-loaded element 9 . In 5 becomes a ball 23 by means of the spring force of a spring 24 against the face of the worm wheel 14th and thus against the backdrop 6 , 7th pressed. The feather 24 and the ball 23 are in one housing 25th along the longitudinal axis 26th of the housing 25th arranged axially movable. In 6 becomes the spring-loaded element 9 by a sleeve rounded at one end 27 shown that about the spring force of a spring 24 ' against the face of the worm wheel 14th and thus against the backdrop 6 , 7th is pressed.

In 7th becomes a functional representation of how the attacks work 8th , 8th' in relation to the energization of the electric motor (motor current IEM ) shown. The vertical arrow 22nd describes the increase in the motor current IEM in the direction of the arrow. In the area of the pushable stops 8th , 8th' , namely in a low stop energization range A. of the electric motor, the system should work reproducibly as a hard mechanical stop. Calibration takes place in this area, which means that a high level of accuracy can be achieved when searching for a stop. A tolerance energization range is required for a robust function B. of the current of the electric motor. The tolerance energization range B. serves as a security to cover mechanical hysteresis and inaccuracies and thus not to release the system too early. In the release current area C. high actuator torques are required - the respective pushable stop can be used in this area 8th , 8th' be overpressed and in the corresponding switching stage H , L. be switched.

List of reference symbols

1

Actuator

2

Clutch-controlled transfer case

3

Two-stage intermediate gear

5

Rotatable component

6th

First backdrop

7th

Second backdrop

8, 8 '

Pushable stop

9

Spring loaded element

10

Axis of rotation

11

coupling

14th

Worm wheel

15th

Shift shaft

16

Coupling cam

17th

Shift gate

18th

First ramp

19th

First counter ramp

20th

Second ramp

21st

Second counter ramp

22nd

Vertical arrow (increase in motor current)

23

Bullet

24, 24 '

feather

25th

casing

26th

Longitudinal axis of the housing

27

Sleeve

I.

First direction of rotation

II

Second direction of rotation

IEM

Motor current

A.

Stop energization area

B.

Tolerance energization range

C.

Release current range

X

First line

Y

Second line

H

First switching stage

L.

Second switching stage

D1

First angle of rotation range

D2

Second angle of rotation range

D3

Third angle of rotation range

Claims (10)

Actuating device (1) for actuating a clutch-controlled transfer case (2) with a two-stage intermediate gear (3) comprising - an electric motor and - at least one component (5) that can be rotated directly or indirectly via the electric motor, namely as a worm wheel (14), clutch bell (16) and shift gate (17), characterized in that two gates, namely a first gate (6) and a second gate (7), are arranged on the worm wheel (14), which are designed and arranged in such a way that they each have at least one Represent overpressible stop (8, 8 ') for a fixed, spring-loaded element (9). Actuating device (1) according to Claim 1 , characterized in that the rotatable component (5) is rotatable through 360 ° about an axis of rotation (10), namely in a first direction of rotation (I) and in a second direction of rotation (II) opposite to the first direction of rotation (I). Actuating device (1) according to Claim 2 , characterized in that the first link (6) and / or the second link (7) are each formed asymmetrically and in such a way that a pushable stop (8, 8 ') is formed only in one direction of rotation (I, II). Actuating device (1) according to Claim 2 or 3 , characterized in that the first link (6) and / or the second link (7) are each designed with mirror symmetry in such a way that a pushable stop (8, 8 ') is formed in both directions of rotation (I, II). Clutch-controlled transfer case (2) for a motor vehicle drive train of a motor vehicle comprising - a clutch (11) for the optional control of the distribution of drive torque to at least two drive axles of a motor vehicle and - a two-stage intermediate gear (3) with a first gear stage (H) and a second gear stage ( L), characterized by an actuating device (1) according to one of the Claims 1 to 4th , whereby the clutch (11) and the two-stage intermediate gear (3) can be actuated via the actuating device (1). Clutch-controlled transfer case according to Claim 5 , characterized in that the first link (6) of the rotatable worm wheel (14) of the actuating device (1) is designed asymmetrically and only at the transition from a second angle of rotation range (D2) to a first angle of rotation range (D1) a pushable stop (8, 8) ') represents. Clutch-controlled transfer case (2) to Claim 5 or 6 , characterized in that the second link (7) of the rotatable worm wheel (14) of the actuating device (1) is asymmetrical and only represents a stop which can be pushed over at the transition from a third angle of rotation range (D3) to a first angle of rotation range (D1). Clutch-controlled transfer case (2) to Claim 5 , characterized in that the first link (6) of the rotatable worm wheel (14) of the actuating device (1) is designed mirror-symmetrically and so both at the transition from a second angle of rotation range (D2) to a first angle of rotation range (D1) and vice versa a pushable stop (8, 8 ') represents. Clutch-controlled transfer case according to Claim 5 or 6 , characterized in that the second link (7) of the rotatable worm wheel (14) of the actuating device (1) is designed mirror-symmetrically and so both at the transition from a third angle of rotation range (D3) to a first angle of rotation range (D1) and vice versa a pushable stop (8, 8 ') represents. Clutch-controlled transfer case (2) according to one of the Claims 5 to 9 , characterized in that the clutch (11) is designed as a friction clutch or as a claw clutch.

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