WO2015165457A1

WO2015165457A1 - Displacement sensor device

Info

Publication number: WO2015165457A1
Application number: PCT/DE2015/200268
Authority: WO
Inventors: Marco Grethel; Markus Baehr
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2014-04-30
Filing date: 2015-04-21
Publication date: 2015-11-05
Also published as: DE112015002052A5

Abstract

The invention relates to a displacement sensor device, in particular for a hydromechanical actuator path, comprising a translationally movable actuator element. The invention is characterized in that the translationally movable actuator element is coupled to a rotatably arranged transmission element such that a translational movement of the actuator element is converted to a rotational movement of the transmission element.

Description

Displacement sensor device

The invention relates to a travel sensor device, in particular for a hydromechanical Aktorstrecke, with a translationally movable actuator element. The invention further relates to a hydromechanical Aktorstrecke with such a displacement sensor device. The invention further relates to a method for detecting a path of a translationally movable actuator element, in particular a hydromechanical

Aktorstrecke, in particular by means of such a displacement sensor device.

German Patent Application DE 10 2009 050 338 A1 discloses a displacement measuring device for a concentric slave cylinder of a disengagement system of a vehicle clutch, wherein an annular piston for actuation of a release bearing is arranged so as to be axially movable within a cylinder housing, wherein at least one sensor element and at least one measured object which is in operative connection therewith are provided, wherein the sensor element having at least one electric coil is arranged concentrically in / to the cylinder housing and the measurement object is integrated into the piston / release bearing or attached to the piston / release bearing. European Patent EP 1 961 985 B1 discloses a slave cylinder for a disengagement device for a vehicle clutch with a device for path measurement and position determination of a piston formed from at least one magnet and at least one sensor operatively connected thereto.

The object of the invention is to simplify the detection of small travel ranges, in particular when operating the clutch, and / or to improve.

The object is achieved in a displacement sensor device, in particular for a hydromechanical Aktorstrecke, with a translationally movable actuator element, characterized in that the translationally movable actuator element is coupled to a rotatably mounted transmission element, that a translational movement of the actuator element is converted into a rotational movement of the transmission element. The displacement sensor device according to the invention is particularly well suited for clutches with actuating bearings and a hydraulic slave piston assembly. A preferred embodiment of the path sensor device is characterized in that the translationally movable actuator element has a rack function. For this purpose, a corresponding toothing may be formed on the actuator element itself. Alternatively, the actuator element may be combined with a rack. To illustrate the rack function is an elongated area, which is essentially flat and equipped with a toothing.

A further preferred embodiment of the path sensor device is characterized in that the rotatably arranged transmission element is designed as a gear with a toothing, which is in engagement with a rack toothing of the translationally movable actuator element. The teeth can be straight or helical teeth. The transmission element is rotatably mounted fixed relative to the actuator element. When the actuator element translates, this leads to a rotational movement of the transmission element. About a Verzahnungsradius the transmission element, a translation between the rack teeth and the gear designed as a transmission element can be adjusted.

A further preferred embodiment of the path sensor device is characterized in that the transmission element at least one translation stage is followed by the fast. This makes it possible in a simple manner to reproducibly detect very small translational movements of the actuator element, in particular in the range of fractions of a millimeter, with the inventive displacement sensor device with a very high accuracy. According to a further aspect of the invention, by converting and translating the translatory movement into a rotational movement, coupling paths can be detected that are significantly smaller than one millimeter.

A further preferred exemplary embodiment of the travel sensor device is characterized in that the travel sensor device comprises at least one pre-load and / or return spring device. The preload and / or return spring device is designed, for example, as a spiral spring and particularly advantageously has a double function. On the one hand, the preload and / or return spring device ensures that tooth flanks always lie in translation on one side. This feature is also referred to as the preload function. By means of the preload function, the accuracy in detecting a translatory movement can be further improved with the travel sensor device according to the invention. On the other hand, with a sufficient preload with the preload and / or Rückstellfedereinrich tion a reset function in a equipped with the actuator actuator device can be shown. This provides the advantage that an independent spring device for the reset function can be omitted. The actuator device is, for example, a clutch slave cylinder or a hydraulic pressure booster.

A further preferred exemplary embodiment of the travel sensor device is characterized in that the travel sensor device comprises an angular position sensor, in particular with a sensor magnet. The angular position sensor according to the invention can advantageously be arranged relatively close to the actuator element, in particular relatively close to a coupling actuated with the actuator element. According to a further aspect of the invention, the angular position sensor is not an actuator itself, but one of the actuator spatially separated actuator element, such as a slave cylinder or a hydraulic pressure booster assigned. The sensor magnet is designed, for example, as a dipole magnet or as a ring magnet.

The invention further relates to a hydromechanical Aktorstrecke with a previously described displacement sensor device. The actuator element is, for example, a transfer ram or a piston rod of the slave piston, which is translationally movable back and forth in a slave cylinder. However, the actuator element can also be a transfer ram or a piston rod of a hydraulic pressure booster piston. The path sensor device according to the invention is advantageously arranged at an interface between a hydraulic and a mechanical action mechanism. The hydromechanical Aktorstrecke preferably serves to represent a clutch actuation. The actuation of the clutch can be done for example with an actuating bearing and a hydraulic slave piston assembly.

In a method for detecting a path of a translationally movable

Actuator element, in particular a previously described hydromechanical Aktorstrecke, in particular by means of a previously described displacement sensor means, the above object is alternatively or additionally achieved in that a translational movement of the actuator element is converted into a rotational movement. As a result, an indirect measuring method is provided with which a high degree of accuracy can be displayed in a simple manner. From the detected rotational movement, a feed path of the actuator element can be determined. In this case, one or the angle sensor can partly used several times. In multiple use, several revolutions are detected with the angle sensor.

A preferred embodiment of the method is characterized in that the rotational movement is translated quickly. This provides the advantage that very small adjustment paths, that is to say translatory movements, of the actuator element can be detected reproducibly with high accuracy.

A further preferred embodiment of the method is characterized in that the rotational movement, in particular the rotational movement translated into the fast, is detected with an angular position sensor. The angle detection can be incremental or absolute.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail. Show it:

1 shows a simplified representation of a hydromechanical Aktorstrecke with a displacement sensor device according to a first embodiment in section;

Figure 2 is a similar view as in Figure 1 according to a second embodiment and

Figure 3 is a comparison with Figure 2 rotated by ninety degrees sectional view.

FIGS. 1 to 3 show two exemplary embodiments of a hydromechanical actuator path 1 according to the invention; 21 simplified on average. In the following, the similarities between the two exemplary embodiments will first be described. The same reference numerals are used to designate the same or similar parts. Thereafter, the differences between the two embodiments will be explained.

The hydromechanical Aktorstreckel; 21 comprises a slave cylinder 4; 24, in which a slave piston 5; 25 is movable translationally back and forth. The translational movement takes place in the direction or parallel to a longitudinal axis 3; 23rd The slave piston 5; 25 is in operation of the hydromechanical Aktorstrecke 1; 21 with hydraulic medium, such as hydraulic oil acted upon. In addition, the slave piston 5; 25 by a transfer ram 6; 26 mechanically with a master piston 8; 28 coupled. During operation of the hydromechanical Aktorstrecke 1; 21, the slave piston 5 moves; 25 with the transfer ram 6; 26 and the master piston 8; 28 translationally along the longitudinal axis 3; 23, ie in Figures 1 to 3 to the left or to the right.

The transfer ram 6; 26 illustrates an actuator element. The actuator element is for

Representation of an indirect path sensor device 10; 30 with a rack toothing 7; 27 provided. The rack toothing 7; 27 can directly on the transfer ram 6; 26 may be provided. The rack toothing 7; 27 but may also be formed on an additional component, which is for the representation of the actuator element with the transfer ram 6; 26 is combined.

The path sensor device 10; 30 comprises a transmission element 12; 32. The transmission element 12; 32 is relative to the translationally movable actuator element 6; 26 rotatably arranged. In this case, the transmission element 12; 32 designed as a gear or pinion with an external toothing, which engages with the rack toothing 7; 27 of the actuator element 6; 26 is located. This achieves in a simple manner that a translational movement of the actuator element 6; 26 in a rotational movement of the transmission element 12; 32 is converted.

The transmission element 12; 32 is a translation stage 14; 34 downstream. With the translation stage 14; 34, the rotational movement of the transmission element 12; 32 translated into fast. This provides the advantage that a relatively small translational movement of the actuator element 6; 26 is converted into a significant or significant rotational movement with an angular position sensor 15; 35 is well measurable.

The path sensor device 10; 30 also includes a preload spring 18 and / or a preload and / or return spring 38. The preload spring 18 or the preload and / or return spring 38 serves, on the one hand, to securely engage the intermeshing toothings, at least in one direction to keep. In addition, the preload and / or return spring 38 allows the representation of a reset function. The hydromechanical actuator path 21 shown in FIGS. 2 and 3 comprises a hydraulic pressure booster. The master piston 28 is translationally movable in a master cylinder 29 back and forth. The transmission element 32 is rotatable about a rotation axis 31 which is arranged perpendicular to the longitudinal axis 23. In this case, the transmission element 32 has an external toothing which is in engagement with the rack toothing 27 of the actuator element 26.

In addition, the transmission element 32 is rotatably connected to a gear 33, which serves to represent the translation stage 34. The gear 33 of the translation stage 34 is in engagement with a further transmission element 42. The further transmission element 42 has in the engagement region with the gear 33 has a toothing and is therefore also referred to as a pinion or shaft.

At the lower end of the transmission element 42 in FIG. 3, a sensor magnet 40 is arranged. The sensor magnet 40 is designed, for example, as a dipole magnet or ring magnet and serves to detect the angular position of a rotational movement of the further transmission element 42. The detection of the angular position can advantageously be arranged very close to a clutch actuated by the hydromechanical actuator path 21.

In addition, the preload and / or return spring 38 is arranged at the lower end of the translation path of the position sensor device 30 in FIG. The preload and / or return spring 38 is designed as a spiral spring and fulfills two subtasks in the path sensor device 30.

First, the preload and / or return spring 38 ensures that the tooth flanks always lie in translation on one side. As a result, the accuracy in the path detection is significantly improved. In addition, with sufficient preload with the preload and / or return spring 38, a return movement of the hydraulic pressure booster can be effected.

The path detection is particularly effective incremental. Even if an absolute

Angle sensor is used advantageously but several revolutions are used for the entire measuring range. The starting point for the counting of the sensor revolution of the further transmission element 42 can be easily achieved by a suitable

Referencing can be found. LIST OF REFERENCES

hydromechanical actuator device longitudinal axis

slave cylinder

slave piston

transfer ram

Rack gear

Master piston Position sensor device Transmission element Transmission stage

Angular position sensor

preload

hydromechanical actuator path longitudinal axis

slave cylinder

slave piston

transfer ram

Rack gear

master piston

Master cylinder

Displacement sensor device

axis of rotation

transmission element

gear translation stage

Angle position sensor preload and / or return spring Sensor magnet

Another transmission element

Claims

Patent claims

Distance sensor device (10; 30), in particular for a hydromechanical actuator section (1; 21), with a translationally movable actuator element (6; 26), characterized in that the translationally movable actuator element (6; 26) is connected to a rotatably arranged transmission element (12 ;32) is coupled in that a translational movement of the actuator element (6; 26) is converted into a rotational movement of the transmission element (12; 32).

Distance sensor device according to claim 1, characterized in that the translationally movable actuator element (6; 26) has a rack function.

Distance sensor device according to one of the preceding claims, characterized in that the rotatably arranged transmission element (12; 32) is designed as a gear with a toothing which is in engagement with a rack toothing (2; 27) of the translationally movable actuator element (6; 26). .

Distance sensor device according to one of the preceding claims, characterized in that at least one high-speed transmission stage (14; 34) is connected downstream of the transmission element (12; 32).

Distance sensor device according to one of the preceding claims, characterized in that the distance sensor device (10; 30) comprises at least one preload and/or return spring device (18; 38).

Distance sensor device according to one of the preceding claims, characterized in that the distance sensor device (10; 30) comprises an angular position sensor (15; 35), in particular with a sensor magnet (40).

Hydromechanical actuator section (1; 21) with a displacement sensor device (10; 30) according to one of the preceding claims.

8. A method for detecting a path of a translationally movable actuator element (6; 26), in particular a hydromechanical actuator section (1; 21) according to claim 7, in particular with the aid of a path sensor device (10; 30) according to one of claims 1 to 6, characterized that a translational movement of the

Actuator element (6; 26) is converted into a rotary movement.

9. The method according to claim 8, characterized in that the rotary movement is translated into speed.

10. The method according to claim 8 or 9, characterized in that the rotational movement, in particular the rotational movement translated into rapidity, is detected with an angular position sensor (15; 35).