Actuator with transmission element

Abstract

An actuator (1) including at least one electromagnet (121, 122, 13, 14, 16, 17, 181, 182, 19, a magnet housing (11), at least one thrust pin (24) and at least one movable armature (14) with a respective plunger (16) that is movable in an axial direction is provided. When the at least one electromagnet (10) is energized, an axial movement of the at least one armature (14) can be transmitted via the at least one plunger (16) to the at least one thrust pin (24). At least one lever (30) is provided which is pivotably mounted on one side in the magnet housing (11) and with which at least one plunger (16) and the at least one thrust pin (24) are operatively connected such that the axial movement of the at least one plunger (16) can be transmitted to the at least one thrust pin (24).

Claims

1. An actuator comprising: at least one electromagnet; a magnet housing; at least one thrust pin; at least one movable armature having a plunger movable in an axial direction, an axial movement of the at least one armature being transmittable to the at least one thrust pin via the at least one plunger when the at least one electromagnet is energized; and at least one lever supported pivotably to one side in the magnet housing and operatively connected to the at least one plunger and the at least one thrust pin in such a way that the axial movement of the at least one plunger is transmittable to the at least one thrust pin, and a thrust pin housing housing the at least one thrust pin, the thrust pin extending out of the thrust pin housing in an actuating position for contact with a sliding cam piece.

2. The actuator as recited in claim 1 wherein the at least one plunger and the thrust pin assigned to the at least one plunger are situated in a parallel misalignment with respect to each other.

3. The actuator as recited in claim 1 wherein the at least one lever includes: a first lever end supported pivotably around a bearing of the magnet housing; a second lever end abutting against a first end of the at least one thrust pin; and a support area situated between the first lever end and the second lever end and operatively connected to the at least one plunger.

4. The actuator as recited in claim 3 wherein the bearing for the first lever end is a pin or a cylinder half, and the first lever end is supported in a frictional or antifrictional manner.

5. The actuator as recited in claim 3 wherein the at least one lever is a formed lever, and wherein the second lever end has a convex indentation, or the first end of the thrust pin has a convex elevation, or the support area of the lever is formed as a trough-like indentation.

6. The actuator as recited in claim 5 wherein the lever is a bent or stamped lever.

7. The actuator as recited in claim 3 wherein a stroke of the thrust pin is adjustable with the aid of the location of the support area.

8. The actuator as recited in claim 7 wherein a length of the stroke of the thrust pin, predefined by the lever, is equal to or greater than the length of the stroke of the armature.

9. The actuator as recited in claim 8 wherein the length of the stroke of the thrust pin is twice the length of the stroke of the armature.

10. A sliding cam system comprising: an actuator comprising: at least one electromagnet; a magnet housing; at least one thrust pin; at least one movable armature having a plunger movable in an axial direction, an axial movement of the at least one armature being transmittable to the at least one thrust pin via the at least one plunger when the at least one electromagnet is energized; and at least one lever supported pivotably to one side in the magnet housing and operatively connected to the at least one plunger and the at least one thrust pin in such a way that the axial movement of the at least one plunger is transmittable to the at least one thrust pin; and a sliding cam piece, the thrust pin interacting with the sliding cam piece.

11. The sliding cam system as recited in claim 10 wherein the thrust pin interacts with a sliding groove of the sliding cam piece.

12. A cam actuator comprising: two electromagnets; two magnet housings; two thrust pins; two movable armatures each having a plunger movable in an axial direction, an axial movement of a respective armature of the armatures being transmittable to a respective thrust pin of the thrust pins via a respective plunger of the plungers when a respective electromagnet of the two electromagnets is energized; and levers supported pivotably to one side in the magnet housing and operatively connected to the plungers and the thrust pins in such a way that the axial movement of the respective plunger is transmittable to the respective thrust pin.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a schematic representation of an actuator according to one specific embodiment of the present invention in a rest position;

(2) FIG. 2 shows a perspective top view of a lever which is provided in an actuator in another specific embodiment of the present invention;

(3) FIG. 3 shows a perspective bottom view of the lever according to FIG. 2; and

(4) FIG. 4 shows a detailed view of the lever according to FIG. 2, installed in the other specific embodiment of the actuator according to the present invention.

DETAILED DESCRIPTION

(5) Identical reference numerals are used for the same elements or elements having the same function. Furthermore, for the sake of clarity, only reference numerals which are necessary for describing the particular figure are shown in the individual figures. The illustrated specific embodiments only represent examples of how the actuator according to the present invention may be designed and do not represent a final limitation of the present invention.

(6) FIG. 1 shows a schematic representation of an actuator 1 according to one specific embodiment of the present invention. The actuator essentially includes an electromagnet unit 10 and a thrust pin unit 20.

(7) Electromagnet unit 10 includes at least one electromagnet 121, 122, 13, 14, 16, 17, 181, 182, 19 and a magnet housing 11. Each electromagnet usually includes a solenoid coil 121 and 122, a magnetic yoke, which in this case is optionally designed as a unit of a yoke sleeve 181 and a yoke disk 182, an optional return path element 19, a pole core 13, an armature 14 and a plunger 16. Solenoid coil 121, 122 is surrounded in each case by magnetic yoke 181, 182, return path element 19 and pole core 13. In each solenoid coil 121, 122, armature 14, including assigned plunger 16, is freely axially movable with respect to a particular armature axis 141. Plunger 16 is connected to armature 14 to form a single piece, or is integrated or is a separate piece, which is fixedly or non-fixedly connected to armature 14, armature 14 in the representation according to FIG. 1 resting upon plunger 16, and no fixed connection being present. A permanent magnet 17 is optionally provided, which holds armature 14 in the lower end position.

(8) Thrust pin unit 20 includes at least one thrust pin 24 as well as optionally additional elements, such as a thrust pin housing 22, guiding sleeves 27 and/or pressure springs 27, which are described below.

(9) When at least one of electromagnets 121, 122, 13, 14, 16, 17, 181, 182, 19 is energized, an axial movement with respect to armature axis 141 of particular assigned armature 14 is transmittable to assigned thrust pin 24 via assigned plunger 16. According to the present invention, at least one lever 30 is provided in actuator 1, which is supported pivotably to one side in magnet housing 11 and is operatively connected to plunger 16 assigned to it and thrust pin 24 in such a way that the axial movement of the at least one plunger 16 along armature axis 141 is transmittable to assigned thrust pin 24. Thrust pin 24 thus moves along a thrust pin axis 243, which is in a parallel misalignment with respect to armature axis 141.

(10) In the specific embodiment according to FIG. 1, an electromagnet unit 10 is provided, for example, including two electromagnets 121, 122, 13, 14, 16, 17, 181, 182, 19. Each electromagnet includes one armature 14, one plunger 16, one lever 30 and one thrust pin 24. It is, however, obvious to those skilled in the art that the lever principle according to the present invention may also be applied with the aid of only one electromagnet, one armature 14, one plunger 16, one lever 30 and one thrust pin 24 as well as with the aid of more than two electromagnets, more than two armatures 14, more than two plungers 16, more than two levers 30 and more than two thrust pins 24. It is furthermore obvious to those skilled in the art that, depending on whether the activation of thrust pins 24 by the electromagnets is to take place synchronously or asynchronously with the aid of armature 14, plunger 16 and lever 30, the number of electromagnets, armatures 14, plungers 16 and levers 30 may be correspondingly equal to or less than the number of thrust pins 24. It is also obvious to those skilled in the art that, even with the same number of electromagnets, armatures 14, plungers 16, levers 30 and thrust pins 24, both a synchronous and an asynchronous activation of thrust pins 24 may take place. In the case of a synchronous activation, a correspondingly large number of electromagnets, including armatures 14, plungers 16, levers 30, activate the same number of thrust pins 24. If the transmission of force to multiple thrust pins 24 is to take place exclusively synchronously via second ends 242, only a single electromagnet, in particular, including one armature 14, one plunger 16 and one lever 30, may be used. This one lever 30 transmits the force to the multiple thrust pins 24. In the case of asynchronous activation, however, not all thrust pins 24 are actuated at the same time, and at least two electromagnets, including particular armature 14, plunger 16 and lever 30 and at least two thrust pins 24, are required for one actuator 1.

(11) By transmitting force with the aid of armatures 14, plungers 16, levers 30 and thrust pins 24, actuator 1 activates machine parts to be actuated, for example, sliding groove 41 of a sliding cam piece 40.

(12) In the representation according to FIG. 1, plungers 16 are designed in the shape of rods. However, it is obvious to those skilled in the art that they may have another shape which is suitable for transmitting force from armatures 14 to levers 30.

(13) In the specific embodiment of actuator 1 according to the present invention according to FIG. 1, solenoid coils 121, 122 or plungers 16 or armature axes 141, on the one hand, and thrust pin axes 243, on the other hand, are not arranged in a line, due to the overall size of solenoid coils 121, 122 of the electromagnet and short distance d2 between the two thrust pins 24, but instead they have a relatively large parallel misalignment with respect to each other. In particular, a distance d1 between two adjacent solenoid coils 121, 122 or associated plungers 16 and armature axes 141 is greater than distance d2 between the two thrust pin axes 243 of assigned adjacent thrust pins 24.

(14) In the specific embodiment according to FIG. 1, each lever 30 of actuator 1 includes a first lever end 31, a second lever end 32 and a support area 33. First lever end 31 is supported pivotably around a bearing 111 in magnet housing 11. Second lever end 32 abuts against a first end 241 of the at least one thrust pin 24. Support area 33 is situated between first lever end 31 and second lever end 32 and is operatively connected to the at least one plunger 16.

(15) In the specific embodiment according to FIG. 1, bearing 111 for first lever end 31 is a pin which has a circular cross section. In another specific embodiment, bearing 111 is, for example, a cylinder half (see FIG. 4). Regardless of the design of bearing 111, first lever end 31 is always supported thereon in a frictional or antifrictional manner.

(16) The at least one lever 30 is preferably manufactured by forming, for example using a stamping/bending method. In the representation according to FIG. 1, second lever end 32 of each of the two levers 30 has a planar contact surface opposite a convex elevation on first end 241 of particular assigned thrust pin 24. Due to this design, an essentially punctiform or linear contact exists between particular thrust pin 24 and particular assigned lever 30, which implements a better and safer transmission of the movement from lever 30 to thrust pin 24. In the representation according to FIG. 1, support area 33 of each of the two levers 30 is also designed as a trough-like indentation, in which particular plunger 16 rests and wherein it is supported in a stable manner during its actuation.

(17) At level 30, stroke s2 of particular thrust pin 24 is preferably adjustable with the aid of the position of support area 33, which is situated between first lever end 31 and second lever end 32 and is operatively connected to the at least one plunger 16. In particular, the length of stroke s2 of particular thrust pin 24, predefined by particular lever 30, should be equal to or greater than the length of stroke s1 of assigned armature 14. A transmission ratio of approximately two has proven to be advantageous, the length of stroke s2 of thrust pin 24 thus being approximately twice the length of stroke s1 of assigned armature 14. However, other transmission ratios may also be implemented.

(18) A permanent magnet 17 may be integrated or situated on pole core 13 and/or on armature 14, which prevents assigned thrust pin 24 from being prematurely pressed out of sliding groove 41 by pressure spring 27 when the voltage for the electromagnet is cut off. Alternatively, solenoid coils 121, 122 may also be energized until the displacement of sliding cam piece 40 of the sliding cam system is completed. Alternatively, however, a very rapid current decay must be ensured to obtain an evaluatable reflection signal upon refraction of thrust pins 24 or one of the two thrust pins 24 into thrust pin housing 22 and thus upon the return stroke of armatures 14 or respective armature 14. It is obvious to those skilled in the art that this energizing and this rapid current decay must be carried out independently of the number of electromagnets and thrust pins 24.

(19) As illustrated in FIG. 1, thrust pins 24 are seated, for example, in a thrust pin housing 22 of thrust pin unit 20 and are axially displaceably guided therein with respect to their particular thrust pin axes 243. Thrust pins 24 are thus displaceably guided with respect to their central movement axis 3 and freely rotate around particular thrust pin axis 243. A guiding sleeve 26 may be provided for each thrust pin 24 in thrust pin housing 22. Guiding sleeve 26 and thrust pin 24 usually form a unit. One pressure spring 27 for each thrust pin 24 is supported on thrust pin housing 22 and on guiding sleeve 26 of associated thrust pin 24. Thrust pins 24 are held in their axial position thereby.

(20) A shoulder 28 may be optionally formed on thrust pin 24, so that the diameter of thrust pin 24 above shoulder 28 is slightly different than the diameter of thrust pin 24 below shoulder 28.

(21) In the representation according to FIG. 1, the axial position of both thrust pins 24 is at the top near the electromagnet, i.e., in the so-called rest position, in which sliding cam piece 40 is not being actuated by actuator 1. Upon completion of the force transmission by the at least one armature 14, the at least one plunger 16, the at least one lever 30 to the at least one thrust pin 24, the axial position of the at least one thrust pin 24 is at the bottom in the so-called working position. Only one of thrust pins 24 then engages with assigned sliding groove 41, regardless of whether only one or multiple thrust pins 24 were extended downward (not illustrated but indicated by the lower end of stroke s2 of thrust pin 24). This one thrust pin 24 then displaces sliding cam piece 40. Depending on the shape of sliding groove 41, in one specific embodiment only a single thrust pin 24 may be fully extended (asynchronous actuation). In another specific embodiment, however, multiple thrust pins 24 may be extended synchronously, with a corresponding, different shape of sliding groove 41, in such a way that only a single thrust pin 24 is fully extended and ultimately engages with a sliding groove 41 assigned to it, and the other thrust pins 24 do not engage with sliding groove 41 assigned to them, even if they are extended to at least part of corresponding stroke s2. In both specific embodiments, therefore, only a single thrust pin 24 is ultimately always extended up to the end of its stroke s2 and retracted into particular assigned sliding groove 41, to avoid damage to thrust pins 24 and/or damage to sliding grooves 41 and ultimately damage to the engine of the system in which actuator 1 is used. The system is, for example, a motor vehicle having an internal combustion engine.

(22) FIG. 2 shows a perspective top view of a lever 30 which is provided in an actuator 1 in a specific embodiment of the present invention other than the one in FIG. 1. FIG. 3 shows a perspective bottom view of lever 30 according to FIG. 2. Lever 30 is manufactured by forming, for example using a stamping/bending method. In contrast to levers 30 in FIG. 1, second lever end 32 herein has a convex or cylindrical elevation. As illustrated in FIG. 4, this convex or cylindrical elevation is located on first end 241 of particular assigned thrust pin 24. As in FIG. 1, support area 33 of lever 30 in FIG. 2 is also formed as a trough-like indentation. First lever end 31 has a formed, cylindrical receptacle, in which bearing 111 (see FIG. 4) is accommodated for first lever end 31.

(23) FIG. 4 shows a detailed view of lever 30 according to FIG. 2 and FIG. 3. Lever 30 is installed in another specific embodiment of actuator 1 according to the present invention. In the specific embodiment illustrated herein, bearing 111 has the shape of a half-cylinder and interacts with the cylindrical receptacle formed on first lever end 31.

LIST OF REFERENCE NUMERALS

(24) 1 actuator (adjusting device) 3 movement axis 10 electromagnet unit 11 magnet housing 111 bearing (housing pin) 121, 122 solenoid coil 13 pole core 14 armature 141 armature axis 16 plunger (push rod) 17 permanent magnet 181 yoke sleeve 182 yoke disk 19 return path element 20 thrust pin unit 22 thrust pin housing 24 thrust pin (drive pin, actuator pin) 241 first end of the thrust pin 242 second end of the thrust pin 243 thrust pin axis 26 guiding sleeve 27 pressure spring 28 shoulder 30 lever 31 first lever end 32 second lever end 33 support area 40 sliding cam piece 41 sliding groove d1 distance between two adjacent plungers d2 distance between two adjacent thrust pins s1 stroke of the armature s2 stroke of the thrust pin