阅读说明：本技术 用于往复式活塞发动机的可变气门机构 (Variable valve mechanism for reciprocating piston engine ) 是由 B·诺埃 于 2019-08-21 设计创作，主要内容包括：本发明涉及一种往复式活塞发动机的可变气门机构,其针对每个气缸具有至少一个换气阀,所述换气阀的阀行程分别由凸轮轴的至少一个凸轮预给定并且借助可切换的气门压杆通过在横向孔中被引导并且从所述气门压杆的侧壁突出的切换销栓的轴向移动而能够被选择性地关断或转换成所述换气阀的另一种行程变化,其中,所述气门压杆的切换销栓通过连接元件与至少一个切换板(3)连接,所述切换板平行于凸轮轴布置并且能够借助至少一个在内燃机上固定的线性致动器(1)克服弹簧元件的力从静止位置移动到切换位置,其中,在所述线性致动器(1)的推杆(2)和所述切换板(3)之间安装有弹簧单元,所述弹簧单元适于存储所述推杆(2)的往复直线运动。(The invention relates to a variable valve train of a reciprocating piston engine, having at least one gas exchange valve for each cylinder, the valve strokes of which are each predefined by at least one cam of a camshaft and which can be selectively closed or converted into another stroke change of the gas exchange valve by means of a switchable valve push rod by means of an axial movement of a switching bolt guided in a transverse bore and projecting from a side wall of the valve push rod, wherein the switching bolt of the valve push rod is connected by means of a connecting element to at least one switching plate (3) which is arranged parallel to the camshaft and can be moved by means of at least one linear actuator (1) fixed on the internal combustion engine against the force of a spring element from a rest position into a switching position, wherein a spring unit is mounted between a push rod (2) of the linear actuator (1) and the switching plate (3), the spring unit is adapted to store the reciprocating linear movement of the push rod (2).)

1. Variable valve train of a reciprocating piston engine, having at least one gas exchange valve for each cylinder, the valve strokes of which are each predefined by at least one cam of a camshaft and which can be selectively closed or converted into another stroke change of the gas exchange valve by means of a switchable valve push rod by axial displacement of a switching bolt guided in a transverse bore and protruding from a side wall of the valve push rod, wherein the switching bolt of the valve push rod is connected by means of a connecting element to at least one switching plate (3) which is arranged parallel to the camshaft and which can be displaced from a rest position into a switching position against the force of a spring element by means of at least one linear actuator (1) fixed on the internal combustion engine, characterized in that a spring unit is mounted between a push rod (2) of the linear actuator (1) and the switching plate (3), the spring unit is adapted to store the reciprocating linear movement of the push rod (2).

2. Variable valve train according to claim 1, characterized in that the linear actuator (1) is fixed transversely to the switching plate (3), the push rod (2) is in connection with one end of a torsion spring (7) fixedly arranged on the internal combustion engine, and the other end of the torsion spring (7) is connected with the switching plate (3).

3. Variable valve mechanism according to claim 1 or 2, characterized in that a lever (8) is provided on the switch plate (3), and the other end of the torsion spring (7) contacts the lever (8).

4. Variable valve mechanism according to any of the preceding claims, characterized in that the lever (8) is separated from the switch plate (3) by punching and is oriented substantially at right angles to the switch plate (3).

5. Variable valve train according to one of the preceding claims, characterized in that the push rod (2) controls a pivot lever (6) which is fixedly arranged on the internal combustion engine and which is itself in operative connection with the one end of the torsion spring (7).

Technical Field

The invention relates to a variable valve train of a reciprocating piston engine, having at least one gas exchange valve for each cylinder, the valve stroke of which is predefined in each case by at least one cam of a camshaft and which can be selectively closed or converted into another stroke change of the gas exchange valve by means of a switchable valve push rod by an axial displacement of a switching bolt guided in a transverse bore and projecting from a side wall of the valve push rod, wherein the switching bolt of the valve push rod is connected by means of a connecting element to at least one switching plate which is arranged parallel to the camshaft and can be displaced longitudinally from a rest position into a switching position against the force of a spring element by means of at least one linear actuator which is fixed on the internal combustion engine.

Background

Such an arrangement of a variable valve mechanism is described in the applicant's unpublished patent application DE 102017101792.5. There, the linear actuator is mounted on a longitudinal side of a cylinder head of the internal combustion engine and is in operative connection with the switching plate. The switching plate is supported at the other end of the cylinder head on a spring element configured as a compression spring. The linear actuator increases the installation space of the internal combustion engine, which is disadvantageous depending on the installation conditions. Furthermore, an elastic connecting element is used as an energy store between the shift plate and the shift bolt. These connecting elements bump at their boundaries under certain conditions and are difficult in their design.

Disclosure of Invention

The object of the present invention is to eliminate these drawbacks and to provide a functional connection between the linear actuator and the switch plate, which enables other types of connections and other types of attachments of the linear actuator.

According to the invention, this object is achieved by: a spring unit is installed between the push rod of the linear actuator and the switching plate, and is implemented to store the reciprocating linear motion of the push rod. Thus, a complex elastic connecting element, in particular a leaf spring, can be dispensed with between the shift plate and the shift bolt, since energy storage takes place between the shift plate and the linear actuator.

In a further embodiment of the invention, it is provided that the linear actuator is fixed transversely to the shift plate, the tappet is operatively connected to one end of a torsion spring which is fixedly arranged on the internal combustion engine, and the other end of the torsion spring is connected to the shift plate. Here, a lever is arranged on the shift plate, wherein the other end of the torsion spring contacts the lever. Thereby, the linear actuator can be mounted transversely to the switching plate at a spatially advantageous position, wherein different positions can be achieved. Preferably, the lever is separated from the switch plate by stamping and is oriented substantially at right angles to the switch plate. In order to advantageously transmit the reciprocating linear movement of the push rod to the torsion spring, a pivot lever is provided, which is fixedly arranged on the internal combustion engine and is in operative connection with the one end of the torsion spring.

By means of the solution according to the invention an arrangement is obtained in which the linear actuator can be arranged at any position transversely to the switch plate and furthermore the energy storage is not performed by a single elastic connecting element but by a spring unit between the linear actuator and the switch plate.

Drawings

The invention is described in the accompanying drawings:

fig. 1 shows a perspective view of a linear actuator and its connection to a switch plate.

Fig. 2 shows a side view of the linear actuator and the on-off switch according to fig. 1.

Detailed Description

In fig. 1 and 2, a linear actuator is generally designated 1 when shown in detail, which is arranged fixedly on the internal combustion engine and has a push rod 2 which transmits the reciprocating linear movement of the linear actuator. A switch plate is marked with 3 and is arranged on at least one plate 4. The plate 4 itself is an integral part of a yoke 5, which is connected to the linear actuator. Two bolts are fastened to the bracket, one of which forms a bearing for a pivot lever 6 which is in operative connection with the push rod 2. The end of the pivot lever 6 extending beyond the push rod is in operative connection with one end of a torsion spring 7, which is pivotably mounted on the second bolt. The other end of torsion spring 7 is in contact with a lever 8, which is oriented substantially at right angles to switch plate 3 and is preferably made integrally with switch plate 3.

The push rod 2, when the linear actuator is activated, pivots the pivot lever 6 downwards according to fig. 1 and 2 and the pivot lever itself pivots the one end of the torsion spring 7. The torsion spring transmits the input motion to the lever 8 as long as the switch plate allows movement. If the shift plate 3 cannot move at this point in time, the torsion spring 7 stores its input pivot until the shift plate 3 allows all the shift pins to move.

List of reference numerals

1) Linear actuator

2) Push rod

3) Switching board

4) Flat plate

5) Clamp hoop

6) Pivoting lever

7) Torsion spring

8) Lever