Camshaft assembly and method of switching a camshaft assembly
By employing a transmission thrust rod and a connecting device in the sliding cam camshaft assembly, the issues of weight, cost, and complexity of the sliding cam assembly are resolved, achieving cost savings, reduced installation space, and reduced complexity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- THYSSENKRUPP POWER COMPONENTS DEUTSCHLAND GMBH
- Filing Date
- 2021-08-10
- Publication Date
- 2026-05-29
Smart Images
Figure CN116075628B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a sliding camshaft assembly for an internal combustion engine, and a method for switching the sliding camshaft assembly for an internal combustion engine. Background Technology
[0002] A sliding camshaft assembly for an internal combustion engine generally includes a first sliding camshaft and a second sliding camshaft. The first sliding camshaft includes a support shaft and at least one sliding cam. The sliding cam itself includes: a first cam group having at least two partial cams with different cam profiles; a shift gate; and preferably a second cam group having at least two partial cams with different cam profiles. The second sliding camshaft includes a support shaft and at least one sliding cam. The sliding cam itself includes: a first cam group having at least two partial cams with different cam profiles; a shift gate; and preferably a second cam group having at least two partial cams with different cam profiles. The difference in cam profiles can also be achieved by different phase angles of two identical partial cams.
[0003] Sliding cams are typically displaced by an electrically actuated actuator, wherein the actuator pin moves into a shift gate, thereby moving the sliding cam to a desired axial position, thus allowing the desired portion of the cam to move for the sliding camshaft assembly. This type of sliding cam system is well known to those skilled in the art. This type of sliding cam system is generally used to optimize gas exchange operations in combustion engines or internal combustion engines.
[0004] According to existing technology, each sliding cam is actuated by an associated actuator. This results in weight, cost, and control complexity.
[0005] DE 10 2016 225 049 A1 discloses a sliding camshaft assembly for an internal combustion engine, comprising a first camshaft and a second camshaft. Each camshaft has cam members arranged axially displaceable and fixedly arranged to rotate together. Cams formed on the cam members have at least two partial cams with different, axially extending configurations, each partial cam having a cam profile. Axial displacement of the cam members is achieved via at least one actuator element. The first cam member on the first camshaft is operatively connected, in a connecting portion of the respective cam member, to a second cam member on the second camshaft in an axially displaceable manner via a coupling mechanism. Here, the coupling mechanism includes an axially displaceable (i.e., displaceable along the camshaft direction) connecting element or a peripherally shaped portion. Summary of the Invention
[0006] The present invention is derived from this and has the following objective: to provide an improved sliding camshaft assembly for internal combustion engines, and in particular to provide a sliding camshaft assembly without additional axially displaceable connecting elements and with a configuration that saves costs, reduces installation space, reduces weight and / or reduces complexity.
[0007] According to the invention, this objective is achieved by the sliding camshaft assembly for an internal combustion engine. Since the transmission includes a first thrust rod and a second thrust rod, a sliding camshaft assembly that can be controlled, for example, without axially displaceable connecting elements can be provided. This is because the two axial movements of the remotely controlled sliding cam of the second sliding camshaft can be achieved using two thrust rods. The thrust rods can have a configuration capable of laterally displacement relative to the longitudinal axis of the camshaft, thus enabling cost savings, reduced installation space, lighter weight, and / or reduced complexity in the sliding camshaft assembly or transmission.
[0008] In particular, further advantageous improvements to the proposed invention are derived from the specification. Different subjects or features can be combined with each other as needed.
[0009] In an advantageous improvement of the invention, the transmission mechanism may include a first actuating device for the first thrust rod and a second actuating device for the second thrust rod, these actuating devices being attached to sliding cams of the first sliding cam shaft, particularly sliding cams attached to the first sliding cam shaft at a certain axial spacing, or these actuating devices being formed by said sliding cams. Due to this measure, no other components are required to implement these actuating devices.
[0010] In another advantageous improvement of the invention, the first actuating device may be configured as a first radially lifting cam profile, and the second actuating device as a second radially lifting cam profile. These actuating devices are arranged on the sliding cam of the first sliding cam shaft, particularly on the shift gate of the sliding cam, or particularly at different axial positions, or these actuating devices are constructed from the sliding cam of the first sliding cam shaft, particularly the shift gate of the sliding cam. Due to this measure, no other components are required to implement these actuating devices.
[0011] In another advantageous improvement of the invention, the first thrust rod may have a first end facing the first sliding cam camshaft, the first thrust rod has a second end facing the second sliding cam camshaft, the second thrust rod has a first end facing the first sliding cam camshaft, and the second thrust rod has a second end facing the second sliding cam camshaft.
[0012] In another advantageous improvement of the invention, the thrust rods may be configured such that they can be displaced between at least two positions, particularly between the following positions: a first position in which a first end of the first thrust rod is away from the first sliding camshaft and a second end of the first thrust rod is near the second sliding camshaft, and a first end of the second thrust rod is near the first sliding camshaft and a second end of the second thrust rod is away from the second sliding camshaft; and a second position in which a first end of the first thrust rod is near the first sliding camshaft and a second end of the first thrust rod is away from the second sliding camshaft, and a first end of the second thrust rod is away from the first sliding camshaft and a second end of the second thrust rod is near the second sliding camshaft.
[0013] In another advantageous improvement of the invention, the first thrust rod may be connected to the second thrust rod via a connecting device, the connecting device being configured such that axial movement of the first thrust rod causes opposite axial movement of the second thrust rod.
[0014] In another advantageous improvement of the invention, the connecting device may be configured as a connecting lever that is hinged to two thrust rods and attached to a rotation axis between the two thrust rods, the rotation axis being oriented perpendicularly to the thrust rods or to the direction of displacement of the thrust rods.
[0015] In another advantageous improvement of the invention, the transmission device may be equipped with a latching device, particularly in the form of a spring / ball mechanism, which is configured to hold the push rod in a releasable manner in a predetermined position.
[0016] In another advantageous improvement of the invention, at least one of these thrust rods, particularly both thrust rods, may be oriented vertically relative to the longitudinal direction of the sliding camshaft, or these thrust rods may be oriented at an angle α between 45° and 90°, preferably between 60° and 80°, relative to the longitudinal direction of the sliding camshaft. Vertical orientation is particularly space-saving, and tilting orientation allows for adjustment between the actuation mechanism of the first sliding camshaft and the shift gate of the second sliding camshaft.
[0017] In another advantageous improvement of the invention, the thrust rod may be constructed as a single piece, or the thrust rod may have a split configuration as a thrust rod segment, and in each case the thrust rod is attached to the connecting device in a hinged manner.
[0018] Furthermore, the present invention also relates to a method for switching a sliding camshaft assembly for an internal combustion engine.
[0019] An advantageous method for switching the sliding camshaft assembly for an internal combustion engine according to the invention is provided by the method steps of the invention. Attached Figure Description
[0020] Other features and advantages of the invention will become clear from the following description of preferred exemplary embodiments with reference to the accompanying drawings, in which:
[0021] Figure 1 A perspective view illustrates a sliding camshaft assembly for an internal combustion engine according to the present invention.
[0022] Figure 2 A perspective view shows a sliding camshaft assembly for an internal combustion engine (first switching state) without a support shaft, according to the present invention.
[0023] Figure 3 A plan view shows a sliding camshaft assembly for an internal combustion engine (first switching state) without a support shaft, according to the present invention.
[0024] Figure 4 A perspective view shows a sliding camshaft assembly for an internal combustion engine (second switching state) according to the invention without a support shaft.
[0025] Figure 5 A plan view shows a sliding camshaft assembly for an internal combustion engine (second switching state) without a support shaft, according to the present invention.
[0026] Figure 6 A plan view illustrates a sliding camshaft assembly for an internal combustion engine, located within a cover module, according to the invention (without an actuator).
[0027] Figure 7 A perspective view illustrates one embodiment of a transmission device for a sliding camshaft assembly of an internal combustion engine according to the present invention.
[0028] Figure 8 A perspective view illustrates a sliding camshaft assembly for an internal combustion engine according to the invention, without a support shaft.
[0029] Figure 9 A three-dimensional plan view illustrates a sliding camshaft assembly for an internal combustion engine, located within a cover module, according to the invention (without an actuator).
[0030] Figure 10 A plan view illustrates a sliding camshaft assembly for an internal combustion engine with a tilted thrust rod according to the present invention.
[0031] Figure 11 A perspective view illustrates a sliding camshaft assembly for an internal combustion engine, comprising a thrust rod with tilted positioning, according to the present invention.
[0032] Figure 12 A perspective view shows a sliding camshaft assembly for an internal combustion engine according to the invention, without a support shaft.
[0033] The following reference numerals are used in the accompanying drawings:
[0034] The longitudinal axes of the L1 and L2 sliding cam shafts
[0035] 1. Sliding cam camshaft
[0036] 2. Sliding Cam Camshaft
[0037] 3 actuators
[0038] 4. Transmission device
[0039] 11 Support Shaft
[0040] 12 sliding cams
[0041] 21 Support Shaft
[0042] 22 sliding cam
[0043] 41 First thrust rod
[0044] 41a First thrust rod section
[0045] 41b Second thrust rod section
[0046] 42 Second Thrust Rod
[0047] 42a First thrust rod section
[0048] 42b Second Thrust Rod Section
[0049] 43 First Actuation Device
[0050] 44 Second Actuation Device
[0051] 45 Connecting device
[0052] 46 latching device
[0053] 121 First Cam Group
[0054] 121a First Part Cam
[0055] 121b Part 2 Cam
[0056] 122 Second Cam Group
[0057] 122a First Part Cam
[0058] 122b Part 2 Cam
[0059] 123 Gear Shift Door
[0060] 124 sliding cam sleeve
[0061] 121' Third Cam Group
[0062] 122' Fourth Cam Group
[0063] 221 First Cam Group
[0064] 221a First Part Cam
[0065] 221b Part Two Cam
[0066] 222 Second Cam Group
[0067] 222a First Part Cam
[0068] 222b Part Two Cam
[0069] 223 Gear Shift Door
[0070] 224 sliding cam sleeve
[0071] 221' Third Cam Group
[0072] 222' Fourth Cam Group
[0073] 411 (First end of the first thrust rod)
[0074] 412 (Second end of the first thrust rod)
[0075] 421 (the first end of the second thrust rod)
[0076] 422 (Second end of the second thrust rod)
[0077] 451 Rotary Axis Detailed Implementation
[0078] First refer to Figure 1 :
[0079] The sliding camshaft assembly for an internal combustion engine according to the present invention includes at least a first sliding camshaft 1 and a second sliding camshaft 2. The first sliding camshaft 1 includes a support shaft 11 and at least one sliding cam 12. The sliding cam 12 itself includes: a first cam group 121 having at least two partial cams 121a, 121b with different cam profiles; a shift gate 123; and preferably, the first cam group 121 has at least one second cam group 122 having at least two partial cams 122a, 122b with different cam profiles 122a, 122b. These cam groups and the shift gate are attached to a sliding sleeve 124, or are constructed as a single piece with the sliding sleeve 124.
[0080] The second sliding cam camshaft 2 includes a support shaft 21 and at least one sliding cam 22. The sliding cam 22 itself includes: a first cam group 221 having at least two different cam profiles 221a, 221b; a shift gate 223; and preferably at least one second cam group 222 having at least two different cam profiles 222a, 222b. These cam groups and the shift gate are attached to or constructed as a single piece with the sliding sleeve 224.
[0081] The first sliding cam camshaft 1 and the second sliding cam camshaft 2 are arranged parallel to each other.
[0082] Sliding cams 12 and 22, and sliding sleeves 124 and 224, are arranged to be fixed so as to be able to rotate together but to be axially displaced on support shafts 11 and 21, respectively. For orientation, the longitudinal direction L1 of sliding cam shaft 1 and the longitudinal direction L2 of sliding cam shaft 2 are illustrated, respectively. Different valve control timings in an internal combustion engine can be achieved using partial cams with different cam profiles.
[0083] Furthermore, the sliding camshaft assembly for an internal combustion engine is equipped with an actuator 3 that interacts with the shift gate 123 of the first sliding camshaft 1. Here, the actuator pin of the actuator 3 engages with the shift gate 123 of the first sliding camshaft 1 according to the desired switching state, and in the process, displaces the sliding cam 12 of the first sliding camshaft 1 to the desired axial position, thereby causing the first portion cams 121a, 122a or the second portion cams 121b, 122b of the cam group 121 and cam group 122 to actuate the corresponding valves (not shown). Therefore, the sliding cam 12 of the first sliding camshaft 1 can be displaced between a first switching state and at least a second switching state via the actuator 3. The sliding camshaft assembly is typically mounted in a cover module and may also be referred to as a valve mechanism, or may be part of a valve mechanism for an internal combustion engine. The cover module is typically completed to form the cylinder head and is mounted in the internal combustion engine. The operating principle of a sliding camshaft is well known to those skilled in the art, and therefore will not be described further here.
[0084] The arrangement involves a transmission device 4 between the first sliding cam camshaft 1, particularly the sliding cam 12 of the first sliding cam camshaft 1, and the second sliding cam camshaft 2, particularly the sliding cam 22 of the second sliding cam camshaft 2. In other words, the sliding cam 22 of the second sliding cam camshaft 2 is actuated via the transmission device 4, and therefore indirectly actuated by the actuator 3 of the first sliding cam camshaft 1, rather than by a dedicated second actuator. Therefore, the actuator can be omitted, that is, the actuator for the second sliding cam camshaft 2, particularly the sliding cam 22 of the second sliding cam camshaft 2, can be omitted.
[0085] The transmission device 4 is preferably a purely mechanical device. According to one embodiment of the invention, the transmission device 4 includes a first thrust rod 41 and a second thrust rod 42, and particularly includes a first actuating device 43 for the first thrust rod 41 and a second actuating device 44 for the second thrust rod 42. These actuating devices are preferably attached to the sliding cam 12 of the first sliding cam camshaft 1 at a certain axial distance from each other, or are formed by the sliding cam 12 of the first sliding cam camshaft 1.
[0086] The thrust rods 41 and 42 are preferably oriented perpendicularly to the longitudinal directions L1 and L2 of the sliding cam shafts 1 and 2. For this purpose, the thrust rods can be radially displaced relative to the sliding cam shafts 1 and 2. It can be assumed that the first ends 411 and 421 of the corresponding thrust rods 41 and 42 each face the first sliding cam shaft 1, while the second ends 412 and 422 of the corresponding thrust rods 41 and 42 each face the second sliding cam shaft 2.
[0087] Transmission device 4, particularly each thrust rod 41 and 42, can be displaced between at least two positions, particularly between the following positions:
[0088] - In the first position, the first end 411 of the first thrust rod 41 is away from the first sliding cam camshaft 1, and the second end 412 of the first thrust rod 41 is close to the second sliding cam camshaft 2. The first end 421 of the second thrust rod 42 is close to the first sliding cam camshaft 1, and the second end 422 of the second thrust rod 42 is away from the second sliding cam camshaft 2.
[0089] - Second position, in which the first end 411 of the first thrust rod 41 is close to the first sliding cam camshaft 1, and the second end 412 of the first thrust rod 41 is away from the second sliding cam camshaft 2, and the first end 421 of the second thrust rod 42 is away from the first sliding cam camshaft 1, and the second end 422 of the second thrust rod 42 is close to the second sliding cam camshaft 2.
[0090] For example, the first actuation device 43 can be configured as a first radial lifting cam profile.
[0091] For example, the second actuation device 44 can be configured as a second radial lifting cam profile.
[0092] Actuators 43 and 44 are arranged on the sliding cam 12 of the first sliding cam camshaft 1, particularly the shift gate 123, preferably at different axial positions, or constructed from the sliding cam 12 of the first sliding cam camshaft 1, particularly the shift gate 123. Due to the axial displacement capability of the sliding cam 11, actuators 43 and 44 can also be axially displaced along the longitudinal axis L1 and the longitudinal axis L2, and thus axially displaced relative to the thrust rod 41 and the thrust rod 42, respectively, which are radially oriented relative to the longitudinal axis L1 and the longitudinal axis L2. This allows different positions of actuators 43 and 44 to be generated relative to the associated thrust rod 41 and the thrust rod 42, respectively. Therefore, for example, in Figure 2As can be clearly seen, the first end 411 of the first thrust rod 41 is positioned in front of the first actuator 43, that is, substantially aligned with the first actuator 43, while the first end 421 of the second thrust rod 42 is positioned adjacent to the second actuator 44, that is, not aligned with the second actuator 44. Although the first end 411 of the first thrust rod 41 is positioned in front of the first actuator 43, the first actuator 43 moves freely because the first end 411 of the first thrust rod 41 is sufficiently far away from the first sliding camshaft 1, and in particular the first actuator 43. The second actuator 44 also moves freely because the first end 421 of the second thrust rod 42 is arranged adjacent to the second actuator 44, although the first end 421 of the second thrust rod 42 can be positioned sufficiently close to the first sliding camshaft 1, and if the first end 421 of the second thrust rod 42 is aligned with the second actuator 44, it can be substantially actuated by the second actuator 44.
[0093] In particular, further details of the invention are derived from the description of the switching operation. The starting point is based on... Figures 1 to 3 The situation is such that, needless to say, the camshaft will rotate during the switching operation.
[0094] Now, the switching operation is initiated by actuator 3, and the actuator pin of actuator 3 moves into the shift gate of the sliding cam 12 of the first sliding cam camshaft 1. This causes the sliding cam 12 of the first sliding cam camshaft 1 to be axially displaced. This process is well known to those skilled in the art and requires no further explanation.
[0095] Then, the second actuation device 44 is positioned in front of the first end 421 of the second thrust rod 42 in a similar manner, thereby causing the second thrust rod 42 to be actuated and moved from a position away from the second sliding cam camshaft 2, and in particular away from the shift gate 223 of the second sliding cam camshaft 2, toward the second sliding cam camshaft 2 to a position close to the second sliding cam camshaft 2.
[0096] This results in the following: the second end 422 of the second thrust rod 42 extends into the shift gate 223 of the sliding cam 22 of the second sliding cam camshaft 2, and the sliding cam 22 of the second sliding cam camshaft 2 is axially shifted from the first switching state to the second switching state.
[0097] Preferably, the first thrust rod 41 is connected to the second thrust rod 42 such that axial movement of the first thrust rod 41 causes opposite axial movement of the second thrust rod 42, and axial movement of the second thrust rod 42 causes opposite axial movement of the first thrust rod 41. In other words, if the first end of the first thrust rod 41 moves toward the first sliding cam camshaft 1, the first end of the second thrust rod 42 moves away from the first sliding cam camshaft 1, and if the first end of the first thrust rod 41 moves away from the first sliding cam camshaft 1, the first end of the second thrust rod 42 moves toward the first sliding cam camshaft 1.
[0098] This can be achieved, for example, by a connecting device 45, particularly a connecting lever, which is hinged to the two push rods 41, 42 and attached to a rotating shaft 451 between the two push rods, the rotating shaft 451 preferably being oriented perpendicularly to the push rods 41, 42 or the direction of displacement of the push rods 41, 42.
[0099] In this case, the first thrust rod 41 is moved in the opposite direction, i.e., toward the first sliding cam camshaft 1, by means of the connecting device 45. This causes the first actuating device 43 to be arranged not in front of the first end 411 of the first thrust rod 41, but close to the first end 411 of the first thrust rod 41. However, this ensures that the thrust rod 41 remains in this state as long as the sliding cam 12 of the first sliding cam camshaft 1 does not switch back to the first switching state.
[0100] If the sliding cam 12 of the first sliding cam camshaft 1 is switched to the first switching state again by the actuator 3, the first actuation device 43 will actuate the first thrust rod 41, and the second end 412 of the first thrust rod 41 will extend into the shift gate 223 of the sliding cam 22 of the second sliding cam camshaft 2, and the sliding cam 22 of the second sliding cam camshaft 2 will be switched to the first switching state again in a similar manner.
[0101] The connecting device 45 similarly displaces the second thrust rod 42 and the thrust rods 41, 42, and the transmission device is once again in the same position as before. Figure 2 The state shown.
[0102] Furthermore, the transmission 4 may be equipped with a latching device 46, such as a spring / ball mechanism, which holds the thrust rods 41, 42 in a releasable manner in a predetermined position, for example, even when the proposed sliding camshaft assembly is typically mounted on an internal combustion engine and vibrates.
[0103] It can be seen that the second sliding camshaft 2 can be remotely controlled via the transmission device 4 through the first sliding camshaft 1. The transmission device 4 is configured such that it is only activated when the switching state of the sliding cam of the first sliding camshaft changes or when it is otherwise in a flywheel state. In other words, due to the transmission device 4, the sliding cam 22 of the second sliding camshaft 2 follows the switching state of the sliding cam 12 of the first sliding camshaft 1.
[0104] Figures 6 to 9 Another embodiment of the invention is shown below. Specifically, the transmission device shown here differs in that the thrust rod itself is split; that is, thrust rod segments 41a and 41b, and thrust rod segments 42a and 42b, are each provided and hinged to the connecting device. This embodiment is preferably configured for actuating shift gates with different axial widths; therefore, in this case, the actuating devices arranged on the shift gate are located at different axial distances. For this purpose, a transmission ratio can be generated by the hinge on the connecting device. Furthermore, for example, thrust rod segments 41a and 42a facing the first sliding cam camshaft 1 can be spaced further apart than thrust rod segments 41b and 42b are spaced further apart, thus enabling actuating devices 43 and 44 that are axially relatively far apart to be realized.
[0105] The design and / or installation space requirements of the shift gate 123 actuated by actuator 3 roughly define / define the spacing between the push rods 41 and 42, and thus also roughly define / define the axial position and width of the oppositely positioned shift gate 223. The shift gate 223 of the second sliding camshaft 2 (which can also respond as a passive shift gate) can have a particularly simple, space-saving, and weight-saving configuration; in particular, for this shift gate 223, the ejection ramp for the actuator pin of the corresponding non-existent actuator can be omitted.
[0106] The example based on the accompanying drawings will be discussed again to further clarify the corresponding installation space requirements.
[0107] therefore, Figures 1 to 5 The switching of the inlet / outlet valve (not shown) is illustrated by means of two separate sliding cams 12, 22 and actuator 3. Due to the design of the first shift gate, the actuating elements for the second / passive shift guide plate can be arranged such that the thrust rods are not separate and are parallel to each other, and that the thrust rods are oriented perpendicularly to the longitudinal direction of the sliding cam shaft, and thus the thrust rods can directly interact with the shift gate 223 of the second sliding cam shaft 2. The actuating elements on the shift gates involved are preferably located at the same axial spacing.
[0108] also, Figures 6 to 9 The diagram illustrates the switching of the inlet / outlet valve by means of two double sliding cams and an actuator. Here, instead of a single sliding cam, a double sliding cam is installed; for example, a double sliding cam typically requires a spatially longer shift gate for the actuator. The fundamental difference of the double sliding cam is that it comprises four cam groups and only one shift gate. The corresponding partial cams of the other cam groups are similarly labeled with reference numerals 121', 122' and 221', 222'. However, compared to the controlled shift gate with an actuator on the first sliding cam camshaft, the shift gate on the second sliding cam camshaft, i.e., the remotely controlled shift gate, requires less space, particularly in the axial direction. Therefore, the shift gates have approximately different widths. Here, a transmission mechanism with a coupling device is preferably considered. The thrust rods are split and parallel to each other at different widths, and are arranged perpendicular to the longitudinal direction of the sliding cam camshaft. The coupling device serves as a type of transmission gear mechanism for the two-part thrust rod. Here, the latching device can also be arranged on the connecting device between the split thrust rods.
[0109] also, Figure 10 and Figure 11 One embodiment of the transmission is shown, in which, although the push rods are not separate, they do not extend parallel to each other. The push rods are arranged at an angle relative to the longitudinal direction of the sliding cam shaft. It is conceivable that the angle α between the push rods and each other is between 45° and 90°, preferably set as an acute angle between 60° and 80°. The contact surfaces at the ends of the push rods are preferably shaped to avoid point contact; this is intended to prevent stress peaks. As with the embodiment having separate and offset push rods, this embodiment is also preferably applicable to shift gates with different spatial ranges in the axial direction.
[0110] Figure 12 An embodiment of the invention is shown in which only one inlet valve and one outlet valve are switched for each cylinder (not shown). In this embodiment, the sliding cams 12, 21 each include only one cam group 121, 221 in each case, and each includes a shift gate 123, 223, the cam groups including at least two partial cams 121a, 221a and 121b, 221b with different cam profiles.
[0111] It goes without saying that the features and details described in connection with the method are also combined with the application of the apparatus according to the invention, and the features and details described in connection with the apparatus are also combined with the application of the method according to the invention, thus making it possible to always or consistently refer to the disclosures relating to various aspects of the invention. Furthermore, the methods described according to the invention can be performed by the apparatus according to the invention.
Claims
1. A sliding camshaft assembly for an internal combustion engine, the sliding camshaft assembly comprising: - A first sliding camshaft (1) with a longitudinal axis (L1) and a second sliding camshaft (2) with a longitudinal axis (L2). - The first sliding cam camshaft (1) includes a support shaft (11) and at least one sliding cam (12), the sliding cam (12) including a first cam group (121) and a shift gate (123). - The second sliding cam camshaft (2) includes a support shaft (21) and at least one sliding cam (22), the sliding cam (22) including a first cam group (221) and a shift gate (223). - The first sliding cam shaft (1) and the second sliding cam shaft (2) are arranged parallel to each other, and the sliding cams (12, 22) are arranged on the support shafts (11, 21) in a manner that allows axial displacement and fixes them to rotate together. - A transmission device (4) for transmitting the switching state of the sliding cam (12) of the first sliding cam camshaft (1) to the sliding cam (22) of the second sliding cam camshaft (2), the transmission device (4) being arranged between the first sliding cam camshaft (1) and the second sliding cam camshaft (2). Its features are, - The transmission device (4) includes a first thrust rod (41) and a second thrust rod (42); the thrust rods (41, 42) are capable of shifting between at least the following two positions: - In the first position, the first end (411) of the first thrust rod (41) is away from the first sliding cam camshaft (1), and the second end (412) of the first thrust rod (41) is close to the second sliding cam camshaft (2), and the first end (421) of the second thrust rod (42) is close to the first sliding cam camshaft (1), and the second end (422) of the second thrust rod (42) is away from the second sliding cam camshaft (2), and - Second position, in the second position, the first end (411) of the first thrust rod (41) is close to the first sliding cam camshaft (1), and the second end (412) of the first thrust rod (41) is away from the second sliding cam camshaft (2), and the first end (421) of the second thrust rod (42) is away from the first sliding cam camshaft (1), and the second end (422) of the second thrust rod (42) is close to the second sliding cam camshaft (2).
2. The sliding camshaft assembly for an internal combustion engine according to claim 1, characterized in that, The transmission device (4) includes a first actuation device (43) for the first thrust rod (41) and a second actuation device (44) for the second thrust rod (42), wherein the actuation devices (43, 44) are attached to the sliding cam (12) of the first sliding cam camshaft (1) or the actuation devices (43, 44) are shaped by the sliding cam (12).
3. The sliding camshaft assembly for an internal combustion engine according to claim 2, characterized in that, The actuation devices (43, 44) are attached to the sliding cam (12) of the first sliding cam camshaft (1) at a certain axial distance.
4. The sliding camshaft assembly for an internal combustion engine according to claim 2, characterized in that, The first actuating device (43) is configured as a first radial lifting cam profile, and the second actuating device (44) is configured as a second radial lifting cam profile. The actuating devices (43 and 44) are arranged on the first sliding cam camshaft (1) or are constructed from the first sliding cam camshaft (1).
5. The sliding camshaft assembly for an internal combustion engine according to claim 2, characterized in that, The actuation devices (43, 44) are arranged on the sliding cam (12) of the first sliding cam camshaft (1).
6. The sliding camshaft assembly for an internal combustion engine according to claim 5, characterized in that, The actuating devices (43, 44) are arranged on the shift gate (123) of the sliding cam (12) and / or at different axial positions.
7. The sliding camshaft assembly for an internal combustion engine according to any one of claims 1-6, characterized in that, - The first thrust rod (41) has a first end (411) facing the first sliding cam camshaft (1). - The first thrust rod (41) has a second end (412) facing the second sliding cam camshaft (2). - The second thrust rod (42) has a first end (421) facing the first sliding cam camshaft (1). - The second thrust rod (42) has a second end (422) facing the second sliding cam camshaft (2).
8. The sliding camshaft assembly for an internal combustion engine according to any one of claims 1-6, characterized in that, The first thrust rod (41) is connected to the second thrust rod (42) via a connecting device (45), the connecting device (45) being configured such that axial movement of the first thrust rod (41) causes axial movement of the second thrust rod (42) in the opposite direction.
9. The sliding camshaft assembly for an internal combustion engine according to claim 8, characterized in that, The connecting device (45) is constructed as a connecting lever that connects the push rods (41, 42) in a hinged manner and is attached to the rotation axis (451) between the push rods (41, 42).
10. The sliding camshaft assembly for an internal combustion engine according to claim 9, characterized in that, The rotation axis (451) is oriented perpendicularly to the thrust rod (41, 42) or to the displacement direction of the thrust rod (41, 42).
11. The sliding camshaft assembly for an internal combustion engine according to any one of claims 1-6, characterized in that, The transmission device (4) is equipped with a latching device (46) configured to hold the push rod (41, 42) in a releasable manner in a predetermined position.
12. The sliding camshaft assembly for an internal combustion engine according to claim 11, characterized in that, The latching device (46) is in the form of a spring / ball mechanism.
13. The sliding camshaft assembly for an internal combustion engine according to any one of claims 1-6, characterized in that, At least one of the thrust rods is oriented perpendicularly to the longitudinal direction (L1, L2) of the sliding cam shaft (1, 2).
14. The sliding camshaft assembly for an internal combustion engine according to claim 13, characterized in that, The thrust rods (41, 42) are both oriented perpendicularly to the longitudinal direction (L1, L2) of the sliding cam camshaft (1, 2).
15. The sliding camshaft assembly for an internal combustion engine according to any one of claims 1-6, characterized in that, The thrust rods (41, 42) are oriented at an angle α between 45° and 90° relative to the longitudinal direction (L1, L2) of the sliding cam shaft (1, 2).
16. The sliding camshaft assembly for an internal combustion engine according to claim 15, characterized in that, The thrust rods (41, 42) are oriented at an angle α between 60° and 80° relative to the longitudinal direction (L1, L2) of the sliding cam shaft (1, 2).
17. The sliding camshaft assembly for an internal combustion engine according to claim 8, characterized in that, The thrust rods (41 and 42) are constructed as a single piece, or the thrust rods have a split configuration as two thrust rod segments (41a, 41b and 42a, 42b), and the thrust rods, whether constructed as a single piece or split, are attached to the connecting device (45) in a hinged manner.
18. The sliding cam camshaft assembly according to any one of claims 1-6, characterized in that, The sliding cam (12) of the first sliding cam camshaft (1) further includes a second cam group (122). The sliding cam (22) of the second sliding cam camshaft (2) further includes a second cam group (222).
19. The sliding cam camshaft assembly according to any one of claims 1-6, characterized in that, - The sliding cam (12) of the first sliding cam camshaft (1) includes four cam groups (121, 122, 121', 122'). - The sliding cam (22) of the second sliding cam camshaft (2) includes four cam groups (221, 222, 221', 222').
20. A method for switching a sliding camshaft assembly for an internal combustion engine according to any one of claims 2-19, characterized in that, The method has the following steps: - The switching operation is initiated by inserting the actuator pin of the actuator (3) into the shift gate (123) of the sliding cam (12) of the first sliding cam camshaft (1), thereby causing the sliding cam (12) of the first sliding cam camshaft (1) to be axially displaced, thereby causing the second actuator (44) to be positioned in front of the first end (421) of the second thrust rod (42), thereby causing the second thrust rod (42) to be actuated and moved from a position away from the second sliding cam camshaft (2) toward the second sliding cam camshaft (2) to a position close to the second sliding cam camshaft (2), thereby causing the second end (422) of the second thrust rod (42) to extend into the shift gate (223) of the sliding cam (22) of the second sliding cam camshaft (2), and causing the sliding cam (22) of the second sliding cam camshaft (2) to be axially displaced from the first switching state to the second switching state. - Connect the first thrust rod (41) to the second thrust rod (42), thereby causing the axial movement of the first thrust rod (41) to cause the opposite axial movement of the second thrust rod (42), thereby causing the first thrust rod (41) to shift in the direction of the first sliding cam camshaft (1). - Position the first actuation device (43) close to the first end (411) of the first thrust rod (41), so that the thrust rod (41) remains in this state as long as the sliding cam (12) of the first sliding cam camshaft (1) does not switch back to the first switching state.
21. The method for switching a sliding camshaft assembly according to claim 20, characterized in that, The switching operation is initiated by inserting the actuator pin of the actuator (3) into the shift gate (123) of the sliding cam (12) of the first sliding cam camshaft (1), thereby actuating the second thrust rod (42) and moving it from a position away from the shift gate (223) of the second sliding cam camshaft (2) toward the second sliding cam camshaft (2) to a position close to the second sliding cam camshaft (2).