CN115614123A - Valve rocker arm assembly - Google Patents

Valve rocker arm assembly Download PDF

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Publication number
CN115614123A
CN115614123A CN202110788300.0A CN202110788300A CN115614123A CN 115614123 A CN115614123 A CN 115614123A CN 202110788300 A CN202110788300 A CN 202110788300A CN 115614123 A CN115614123 A CN 115614123A
Authority
CN
China
Prior art keywords
rocker arm
valve
side rocker
drive
assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110788300.0A
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Chinese (zh)
Inventor
肖荣亭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Holding China Co Ltd
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to CN202110788300.0A priority Critical patent/CN115614123A/en
Publication of CN115614123A publication Critical patent/CN115614123A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/06—Cutting-out cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves
    • F01L2013/001—Deactivating cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D2013/0296—Changing the valve lift only

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The present invention relates to a valve rocker arm assembly. The valve rocker arm assembly includes a rocker arm lever and a support shaft supporting the rocker arm lever, the rocker arm lever being capable of being driven by a drive mechanism to rotate about the support shaft to push the valve mechanism. Wherein the rocker arm lever comprises a valve-side rocker arm, a plurality of drive-side rocker arms, and a corresponding plurality of switchable one-way clutches, the valve-side rocker arm and each drive-side rocker arm being respectively coaxially supported on the support shaft and being rotatable relative to each other, each switchable one-way clutch being respectively disposed between the valve-side rocker arm and the corresponding drive-side rocker arm in the same torque transmission direction, so that each drive-side rocker arm can be selectively connected or disconnected from the valve-side rocker arm in a one-way, torsionally-rotatable manner. The valve rocker arm assembly is simple in structure and low in cost.

Description

Valve rocker arm assembly
Technical Field
The invention relates to the technical field of vehicles. In particular, the present invention relates to a valve rocker arm assembly for a valve train of an engine.
Background
A valve rocker arm is a component that converts the rotational motion of a cam mechanism into linear motion suitable for opening and closing the valve mechanism in an engine of a motor vehicle. In order to improve the combustion efficiency of the engine, the exhaust period of the engine cylinder needs to be adjusted under different operating conditions, so that different valve lifts are obtained. Further, it is also possible to implement cylinder deactivation and the like by disabling the rotational movement of the valve rocker arm.
In the prior art, for example, as described in patent documents CN 105899770A, the above function is usually achieved by providing a hydraulic system in the rocker arm lever. In these conventional valve rocker arms, the hydraulic system is complicated in structure, not only resulting in high production costs, but also risking fluid leakage. This makes the conventional rocker arm poor in economy and reliability.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a valve rocker arm assembly with simple structure.
The above technical problem is solved by a valve rocker assembly according to the present invention. The valve rocker arm assembly comprises a rocker arm rod and a supporting shaft for supporting the rocker arm rod, wherein the rocker arm rod can be driven by a driving mechanism to rotate around the supporting shaft so as to push the valve mechanism. Wherein the rocker arm lever comprises a valve-side rocker arm, a plurality of drive-side rocker arms, and a corresponding plurality of switchable one-way clutches, the valve-side rocker arm and each drive-side rocker arm being respectively coaxially supported on the support shaft and being rotatable relative to each other, each switchable one-way clutch being respectively disposed between the valve-side rocker arm and the corresponding drive-side rocker arm in the same torque transmission direction, so that each drive-side rocker arm can be selectively connected or disconnected from the valve-side rocker arm in a one-way, torsionally-rotatable manner. A plurality of different valve lifts may be provided by a plurality of drive side rocker arms each independent of the other, with a corresponding switchable one-way clutch provided between each drive side rocker arm and the valve side rocker arm so that the drive torques of the different drive side rocker arms on the valve side rocker arms do not interfere with each other. Meanwhile, the torque transmission between the driving side rocker arm and the valve side rocker arm can be completely cut off by disconnecting the switchable one-way clutch, so that the functions of cylinder deactivation and the like can be realized in a simple manner.
According to a preferred embodiment of the invention, each switchable one-way clutch can be arranged axially between the valve-side rocker arm and the respective drive-side rocker arm, so that the switchable one-way clutch can be mounted in a simple manner and contributes to saving radial space.
According to another preferred embodiment of the present invention, the valve rocker arm assembly may include two drive-side rocker arms and corresponding two switchable one-way clutches, the valve-side rocker arms being located axially between the two drive-side rocker arms, thereby achieving two different valve lifts with a simple layout.
According to another preferred embodiment of the present invention, the valve-side rocker arms may have a first end for engaging the valve mechanism and a second end opposite to the first end and connected to the support shaft, and each of the drive-side rocker arms may have a third end for engaging the drive mechanism and a fourth end opposite to the third end and connected to the support shaft, the first end of the valve-side rocker arm and the third end of each of the drive-side rocker arms being located on opposite sides of the support shaft, respectively, in a longitudinal direction perpendicular to the rotation axis. In this design, the valve-side rocker arm and the drive-side rocker arm are joined end to end substantially in the longitudinal direction to constitute the entire rocker arm lever, so that the support shaft connecting the two is located at the middle of the entire rocker arm lever.
According to another preferred embodiment of the present invention, the valve rocker arm assembly may further include a torsion spring provided between the valve-side rocker arm and the corresponding drive-side rocker arm to provide the pretensioning torque. When the driving mechanism does not provide driving torque, the valve side rocker arm is kept abutting against the valve mechanism by the pre-tightening torque provided by the torsion spring, and the driving side rocker arm is kept abutting against the driving mechanism, so that the vibration phenomenon is prevented.
According to another preferred embodiment of the invention, the valve rocker assembly may further comprise an actuation mechanism for controlling the switchable one-way clutch. An actuation mechanism may control the switchable one-way clutch to switch between the one-way torque transmitting state and the disengaged state. The actuating mechanism may be, for example, an electromagnetic actuator, or may be other forms of actuators, mechanical, hydraulic, etc.
According to a further preferred embodiment of the invention, the switchable one-way clutch may comprise a plurality of clutch units distributed in the circumferential direction, so that torque can be transmitted uniformly in the circumferential direction.
According to another preferred embodiment of the present invention, the valve rocker arm assembly may further include a plurality of rollers corresponding to the plurality of drive-side rocker arms, respectively, each roller being rotatably mounted on the corresponding drive-side rocker arm such that each drive-side rocker arm can be in rolling engagement with the drive mechanism via the corresponding roller, whereby friction and wear on the contact surface can be reduced.
Drawings
The invention is further described below with reference to the accompanying drawings. In the figures, elements having the same function are denoted by the same reference numerals. Wherein:
FIG. 1 is a schematic illustration of an installation of a valve rocker assembly according to an embodiment of the present invention;
FIG. 2 shows a top view of a valve rocker assembly according to an embodiment of the present invention;
FIG. 3 shows a cross-sectional view of a valve rocker assembly according to an embodiment of the present invention; and
fig. 4a and 4b show schematic diagrams of switchable one-way clutches of a valve rocker assembly according to an embodiment of the invention.
Detailed Description
Specific embodiments of a valve rocker arm assembly according to the present invention will be described below with reference to the accompanying drawings. The following detailed description and drawings are illustrative of the principles of the invention, which is not to be limited to the preferred embodiments described, but is to be defined by the scope of the appended claims.
According to an embodiment of the present invention, a valve rocker arm assembly for a vehicle engine is provided for controlling the opening and closing of an engine valve train. Fig. 1 shows a schematic view of an installation of a valve rocker assembly 10 according to an exemplary embodiment of the invention. In fig. 1, a valve rocker assembly 10 is mounted in an engine for transmitting drive force between a drive mechanism and a valve train. In this embodiment, the directly actuated valve mechanism is a pushrod 20 that controls the opening and closing of an engine valve, and the actuating mechanism is a cam 30. The valve rocker arm assembly 10 may convert rotational motion of the cam 30 into linear motion of the pushrod 20. In an embodiment of the present invention, the valve rocker arm assembly 10 includes a rocker arm lever and a support shaft 1 supporting the rocker arm lever.
Fig. 2 and 3 showbase:Sub>A top view andbase:Sub>A cross-sectional view along sectionbase:Sub>A-base:Sub>A, respectively, of the valve rocker assembly 10 of fig. 1. As shown in the drawing, the rocker arm lever is composed of a plurality of portions including a valve-side rocker arm 2 and a plurality of drive-side rocker arms 3. The valve-side rocker arm 2 and each of the drive-side rocker arms 3 are respectively supported radially outward of the support shaft 1, and any two of them can relatively rotate about the same rotation axis. In the present embodiment, the rocker arm lever is exemplarily shown to have two drive-side rocker arms 3. The valve-side rocker arm 2 may be disposed between the two drive-side rocker arms 3 in the axial direction. It should be understood that a greater number of drive-side rocker arms 3 may be provided in the valve rocker arm assembly 10, as installation space permits.
In the present embodiment, the valve side rocker arm 2 and each of the driving side rocker arms 3 are members that are independently rotatable with respect to the support shaft 1. To axially position these components, the valve rocker arm assembly 10 may further include a retainer ring 6 for axially retaining the drive side rocker arm 3. For example, two retaining rings 6 may be respectively mounted in annular grooves on the support shaft 1 at the end of the corresponding drive-side rocker arm 3 remote from the valve-side rocker arm 2. The retaining ring 6, which is mounted in the annular groove, is fixed at least in the axial direction relative to the support shaft 1. Thus, the valve-side rocker arm 2 and each of the drive-side rocker arms 3 are constrained in the axial direction between the retaining rings 6 on both sides so as to be positioned relative to the support shaft 1.
As shown in fig. 1 and 2, the valve side rocker arm 2 and the drive side rocker arm 3 are each of a structure that extends substantially in the longitudinal direction, which is the direction perpendicular to the rotation axis. The support shaft 1 may connect the end of the valve-side rocker arm 2 with the opposite end of each drive-side rocker arm 3 in the longitudinal direction, so that together they form a complete rocker arm lever which extends substantially also in the longitudinal direction. Specifically, the valve side rocker arm 2 has first and second ends that are opposite in the longitudinal direction, and each drive side rocker arm 3 has third and fourth ends that are opposite in the longitudinal direction. The valve-side rocker arm 2 has a first end for engaging the push rod 20 and a second end connected to the support shaft 1. The third end of each drive-side rocker arm 3 is for engaging the cam 30, while the fourth end is connected with the support shaft 1. The first end of the valve side rocker arm 2 and the third end of each drive side rocker arm 3 are located on opposite sides of the support shaft 1 in the longitudinal direction, respectively.
The valve rocker assembly 10 may further include a plurality of rollers 8 corresponding to the plurality of drive side rocker arms 3. Each drive-side rocker arm 3 is provided with a corresponding roller 8. Each roller 8 is rotatable relative to the corresponding drive-side rocker arm 3 with its axis of rotation parallel to the axis of rotation of the drive-side rocker arm 3 about the support shaft 1. The drive-side rocker arm 3 is in rolling contact with the cam 30 via its roller 8. Preferably, as described above, the roller 8 may be provided at the end of the drive-side rocker arm 3 remote from the support shaft 1, i.e., at the third end.
As shown in fig. 3, a corresponding switchable one-way clutch 5 is provided between each drive-side rocker arm 3 and the valve-side rocker arm 2, respectively. The switchable one-way clutch 5 can control torque transmission between the corresponding drive-side rocker arm 3 and the valve-side rocker arm 2. In particular, the switchable one-way clutch 5 is switchable between two states, on and off. When the switchable one-way clutch 5 is in the on state, torque can be transmitted from each drive-side rocker arm 3 to the valve-side rocker arm 2 but cannot be transmitted from the valve-side rocker arm 2 to the drive-side rocker arm 3 in the direction in which the drive mechanism urges the rocker arm lever to rotate (counterclockwise rotation in fig. 1). In this case, the two drive-side rocker arms 3 engage with two different cams 30, respectively, so that two different lift ranges can be provided for the valve train, and when the valve-side rocker arm 2 is pushed by one drive-side rocker arm 3, the drive-side rocker arm 3 does not rotate by bringing the other drive-side rocker arm 3. When the switchable one-way clutch 5 is in the off-state, no torque can be transmitted in any direction between the rocker arms on either side of the switchable one-way clutch 5. Therefore, in the case where all the switchable one-way clutches 5 are simultaneously turned off, the cylinder deactivation or the like can be realized.
As shown in fig. 3, corresponding recesses are formed on axially opposite surfaces of the valve side rocker arm 2 and the drive side rocker arm 3, respectively, and a mounting space for the switchable one-way clutch 5 is formed between the opposite recesses. The switchable one-way clutch 5 may comprise one or more clutch units, wherein a plurality of clutch units may be distributed circumferentially, in particular uniformly distributed circumferentially.
Fig. 4a and 4b show an exemplary configuration of the switchable one-way clutch 5. As shown, each clutch unit includes an engaging piece and an elastic member. One end of the engaging piece is rotatably mounted inside a recess of either one of the valve-side rocker arm 2 and the drive-side rocker arm 3. The extension direction of the engagement piece is substantially along the tangential direction of the support shaft 1, while the rotation direction of the engagement piece with respect to the groove is substantially along the axial direction of the support shaft 1. Thus, during rotation of the engagement piece, the engagement piece may be fully received inside the connected recess (fig. 4 b), or the free end may be extended into the recess on the opposite side while the connected end remains inside the connected recess (fig. 4 a). When the engagement piece extends the free end into the recess on the opposite side, the engagement piece can abut in a predetermined rotational direction between the valve-side rocker arm 2 and the corresponding drive-side rocker arm 3, thereby enabling unidirectional torque transmission. When the engagement piece can be completely accommodated inside the connected groove, there is no torque transmission between the valve side rocker arm 2 and the corresponding drive side rocker arm 3. A plurality of such clutch units, which are identical or similar, can be distributed uniformly in the circumferential direction and controlled synchronously. It should be noted that this is only one possible implementation of the switchable one-way clutch 5, and that there are many different types of switchable one-way clutches in the prior art that are equally applicable to the valve rocker assembly 10 of the present invention.
In order to control the switching state of the switchable one-way clutch 5, the valve rocker assembly 10 may further comprise an actuation mechanism 7 for controlling the switchable one-way clutch 5. The actuator mechanism 7 may be provided, for example, axially outside the drive-side rocker arm 3, or may be provided inside the drive-side rocker arm 3 or the valve-side rocker arm 2. The actuating mechanism 7 may be, for example, an electromagnetic actuator, or may also be another type of actuating mechanism, such as a hydraulic or mechanical actuating mechanism, or the like.
According to a preferred embodiment, the valve rocker assembly 10 may further comprise one or more torsion springs 4. Each torsion spring 4 is provided between the corresponding drive-side rocker arm 3 and valve-side rocker arm 2, respectively, so as to provide a preload torque between the drive-side rocker arm 3 and valve-side rocker arm 2. For example, as shown in fig. 3, the torsion springs 4 may also be mounted in annular grooves on opposite axial end faces of the valve-side rocker arms 2 and the corresponding drive-side rocker arms 3. The pretensioning torques provided by the torsion springs 4 push the valve-side rocker arm 2 and the corresponding drive-side rocker arm 3 in opposite directions, respectively, so that the valve-side rocker arm 2 remains in abutment against the push rod 20 and the drive-side rocker arm 3 remains in abutment against the cam 30. Therefore, even in the case of no torque transmission, the valve side rocker arm 2 and the drive side rocker arm 3 are not in a relaxed state, thereby avoiding generation of vibration.
According to the valve rocker arm assembly, the plurality of independent driving side rocker arms are respectively connected with the same valve side rocker arm through the switchable one-way clutch, so that various different valve lifts can be realized through a simple structure. The valve rocker arm assembly is easy to produce and assemble, convenient to operate and high in reliability.
Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, a person skilled in the art will be more particularly directed to providing a technical teaching for converting at least one exemplary embodiment, wherein various changes may be made in the function and arrangement of elements described without departing from the scope of the claims.
List of reference numerals
1. Supporting shaft
2. Valve side rocker arm
3. Driving side rocker arm
4. Torsional spring
5. Switchable one-way clutch
6. Check ring
7. Actuating mechanism
8. Roller
10. Valve rocker arm assembly
20. Push rod
30. Cam wheel
A-A section

Claims (9)

1. A valve rocker arm assembly (10) comprising a rocker arm lever and a support shaft (1) supporting the rocker arm lever, the rocker arm lever being drivable by a drive mechanism to rotate about the support shaft (1) to actuate a valve mechanism,
it is characterized in that the preparation method is characterized in that,
the rocker arm lever comprises a valve-side rocker arm (2), a plurality of drive-side rocker arms (3) and a corresponding plurality of switchable one-way clutches (5), the valve-side rocker arm (2) and each drive-side rocker arm (3) being respectively coaxially supported on the support shaft (1) and being rotatable relative to one another, each switchable one-way clutch (5) being respectively arranged between the valve-side rocker arm (2) and the corresponding drive-side rocker arm (3) in the same torque transmission direction, so that each drive-side rocker arm (3) can be selectively connected or disconnected from the valve-side rocker arm (2) in a one-way rotationally fixed manner.
2. A valve rocker arm assembly (10) according to claim 1, characterized in that each switchable one-way clutch (5) is arranged axially between the valve-side rocker arm (2) and the respective drive-side rocker arm (3).
3. A valve rocker assembly (10) according to claim 2, characterized in that the valve rocker assembly (10) comprises two drive-side rocker arms (3) and correspondingly two switchable one-way clutches (5), the valve-side rocker arm (2) being located axially between the two drive-side rocker arms (3).
4. A valve rocker assembly (10) according to claim 1, characterized in that the valve-side rocker arm (2) has a first end for engaging the valve train and a second end opposite the first end and connecting the support shaft (1), each drive-side rocker arm (3) having a third end for engaging the drive mechanism and a fourth end opposite the third end and connecting the support shaft (1), the first end of the valve-side rocker arm (2) and the third end of each drive-side rocker arm (3) being located on opposite sides of the support shaft (1) in a longitudinal direction perpendicular to the axis of rotation, respectively.
5. A valve rocker assembly (10) according to claim 1, characterized in that the valve rocker assembly (10) further comprises a torsion spring (4) arranged between the valve-side rocker arm (2) and the respective drive-side rocker arm (3) to provide a pretensioning torque.
6. A valve rocker assembly (10) according to claim 1, characterized in that the valve rocker assembly (10) further comprises an actuation mechanism (7) for controlling the switchable one-way clutch (5).
7. A valve rocker assembly (10) according to claim 6, characterized in that the actuating mechanism (7) is an electromagnetic actuator.
8. A valve rocker assembly (10) according to claim 1, characterized in that the switchable one-way clutch (5) comprises a plurality of clutch units distributed circumferentially.
9. A valve rocker assembly (10) according to any of claims 1 to 8, characterized in that the valve rocker assembly (10) further comprises a plurality of rollers (8) corresponding to a plurality of the drive-side rocker arms (3), respectively, each roller (8) being rotatably mounted on a respective drive-side rocker arm (3) such that each drive-side rocker arm (3) is capable of rolling engagement with the drive mechanism via the respective roller (8).
CN202110788300.0A 2021-07-13 2021-07-13 Valve rocker arm assembly Pending CN115614123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110788300.0A CN115614123A (en) 2021-07-13 2021-07-13 Valve rocker arm assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110788300.0A CN115614123A (en) 2021-07-13 2021-07-13 Valve rocker arm assembly

Publications (1)

Publication Number Publication Date
CN115614123A true CN115614123A (en) 2023-01-17

Family

ID=84856185

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110788300.0A Pending CN115614123A (en) 2021-07-13 2021-07-13 Valve rocker arm assembly

Country Status (1)

Country Link
CN (1) CN115614123A (en)

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Effective date of registration: 20240322

Address after: 1st Floor, Building 2, No. 1 Antuo Road, Anting Town, Jiading District, Shanghai

Applicant after: SCHAEFFLER HOLDING(CHINA) Co.,Ltd.

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Applicant before: SCHAEFFLER TECHNOLOGIES AG & CO. KG

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