Mounting arrangement for variable valve actuation

Abstract

In one embodiment, a rocker arm assembly configured for variable valve actuation comprises at least one rocker arm, a first valve and a second valve, a valve manifold configured to be actuated by the at least one rocker arm and having a first opening and a second opening for receiving the first and second valves respectively, and a retaining arrangement that is at least partially received by the first opening of the valve manifold. The retaining arrangement includes a pressure nut and a ring for retaining the pressure nut. The retaining arrangement is configured to hold the first valve when the first valve is inserted into the first opening to prevent the valve manifold from separating from the first valve.

Description

PRIORITY

[0001] This application claims the benefits pursuant to 35 USC § 119(e) of the preliminary US patent application No. 63 / 515,933, filed on July 27, 2023, which is hereby incorporated by reference. TECHNICAL

[0002] This disclosure relates generally to a valve train system and in particular to a holding arrangement of a rocker arm assembly configured for variable valve actuation. BACKGROUND

[0003] Internal combustion engines typically use valve train systems to actuate the engine valves. These systems can include, for example, a combination of cams, shafts, rocker arms, and various motion transmission mechanisms that can be driven by the rotation of the engine's crankshaft and selectively transmit the actuating motion to the downstream valves. SUMMARY OF CERTAIN EXECUTION FORMS

[0004] In a valve train system, a rocker arm can be coupled on one side to a camshaft or pressure tube and on the other side to engine valves to transmit the actuating motion from the camshaft or pressure tube to the downstream engine valves in the cylinder head. For example, engine valves can be used to seal a combustion chamber, ensuring the correct timing of gas intake and exhaust. Generally, a valve manifold can be used to connect the rocker arm and engine valves to achieve this motion transmission. However, unintended separation of the valve manifold from the engine valves can occur, for example, due to various factors such as a critical unlocking event that can occur with variable valve timing (VVT). This is a catastrophic event that can lead to severe damage to the engine or other system components.

[0005] Certain embodiments disclosed herein provide a robust mechanical system capable of preventing the bridge from disengaging under various engine operating conditions. Certain embodiments disclosed herein may, for example, and without limitation, be applied to a split rocker arm that can work in conjunction with an engine brake rocker arm, although other suitable embodiments of rocker arm configurations, such as integrated rocker arms, are also covered by this disclosure.

[0006] In certain embodiments, a rocker arm assembly configured for variable valve actuation comprises at least one rocker arm, a first valve and a second valve, a valve manifold configured to be actuated by the at least one rocker arm and comprising a first opening and a second opening for receiving the first and second valves respectively, and a retaining arrangement that is at least partially received by the first opening of the valve manifold. The retaining arrangement includes a pressure nut and a ring for retaining the pressure nut. The retaining arrangement is configured to hold the first valve when the first valve is inserted into the first opening to prevent the valve manifold from separating from the first valve.

[0007] In certain embodiments, the holding arrangement is configured to mechanically hold the first valve when the first valve is inserted into the first opening.

[0008] In certain embodiments, the holding arrangement is configured to hold the first valve by friction when the first valve is inserted into the first opening.

[0009] In certain embodiments, the pressure nut has a central opening and a plurality of internal teeth extending from the central opening.

[0010] In certain embodiments, the multiple inner teeth extend inwards from the central opening and are inclined upwards towards a center.

[0011] In certain embodiments, the multiple inner teeth extend downwards from the central opening.

[0012] In certain embodiments, the ring is ground with an open surface.

[0013] In certain embodiments, the ring is closed.

[0014] In certain embodiments, the first opening has an upper housing for receiving one end of the first valve and a lower housing for receiving the holding arrangement.

[0015] In certain embodiments, the lower housing is frustoconical or circular in shape.

[0016] In certain embodiments, the first opening has a groove for holding the ring.

[0017] In certain embodiments, the holding arrangement also includes a wire clamp for holding the ring.

[0018] In certain embodiments, the first opening of the valve bridge has a side with a window configured such that part of the wire clamp or wire clip is accessible when the wire clamp is inserted into the first opening, and the part of the wire clamp accessible through the window can be actuated to open and close the wire clamp.

[0019] In certain embodiments, the at least one rocker arm has a locking arrangement configured to switch between a locked position and an unlocked position, wherein the retaining arrangement is configured to resist separation of the valve bridge from the first valve when the locking arrangement switches.

[0020] In certain embodiments, a valve bridge of a rocker arm assembly is provided, configured for variable valve actuation. The valve bridge has a first opening and a second opening for receiving a first valve and a second valve, respectively, and a retaining arrangement that is at least partially received by the first opening of the valve bridge. The retaining arrangement includes a pressure nut and a ring for holding the pressure nut. The retaining arrangement is configured to hold the first valve when the first valve is inserted into the first opening, thus preventing the valve bridge from separating from the first valve.

[0021] In certain embodiments, the first opening has an upper housing for receiving one end of the first valve and a lower housing for receiving the holding arrangement.

[0022] In certain embodiments, the lower housing has a groove for engagement with the ring.

[0023] In certain embodiments, a valve bridge of a rocker arm assembly is provided, configured for variable valve actuation. The valve bridge has a first opening and a second opening for receiving a first valve and a second valve, respectively, and a retaining arrangement that is at least partially received by the first opening of the valve bridge. The retaining arrangement comprises a pressure nut, a ring for holding the pressure nut, and a wire clamp for holding the ring. The retaining arrangement is configured to hold the first valve when the first valve is inserted into the first opening, thus preventing the valve bridge from separating from the first valve.

[0024] In certain embodiments, the first opening of the valve bridge has a side with a window configured such that part of the wire clamp is accessible when the wire clamp is inserted into the first opening, and the part of the wire clamp accessible through the window can be actuated to open and close the wire clamp.

[0025] The embodiments disclosed herein are only examples, and the scope of this disclosure is not limited to them. Certain embodiments may include all, some, or none of the components, elements, features, functions, processes, or steps of the embodiments disclosed herein. Embodiments according to the invention are disclosed in particular in the appended claims, which relate to a method, a storage medium, a system, and a computer program product, wherein each feature mentioned in one claim category, e.g., Method, may also be claimed in another claim category, e.g., System. The dependencies or cross-references in the appended claims are included for formal reasons only.However, any subject matter resulting from a deliberate cross-reference to earlier claims (in particular, multiple dependencies) can also be claimed, so that every combination of claims and their features is disclosed and can be claimed independently of the dependencies chosen in the appended claims. The subject matter that can be claimed includes not only the combinations of features set out in the appended claims, but also any other combination of features in the claims, wherein each feature mentioned in the claims can be combined with any other feature or combination of features in the claims.Furthermore, each of the embodiments and features described or illustrated herein may be claimed in a separate claim and / or in any combination with an embodiment or feature described or illustrated herein or with any of the features of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows an example of a valve train system according to certain embodiments of this disclosure. Fig. 2 shows the valve train system Fig. 1 from a different perspective, showing in particular an engine brake rocker arm. Fig. Figure 3 shows a partial cross-section of the valve train system, in particular a valve bridge according to certain embodiments of this disclosure. Fig. 4 shows a close-up of Fig. 3, which in particular shows an example holding arrangement according to certain embodiments of this disclosure. Fig. Figure 5 shows an exploded view of the holding arrangement. Fig. Figure 6 shows an example of a pressure nut for the holding arrangement. Fig. Figure 7 shows an example of a ring of the holding arrangement. Fig. Figure 8 shows a partial cross-section of the valve train system, in particular an example valve bridge according to certain embodiments of this disclosure. Fig. 9 shows a close-up of Fig. 8, which in particular shows an example of a holding arrangement according to certain embodiments of this disclosure. Fig. Figure 10 shows an exploded view of the holding arrangement. Fig. Figure 11 shows an example of a pressure nut for the holding arrangement. Fig. Figure 12 shows an example of a ring of the holding arrangement. Fig. Figure 13 shows an example of a wire clamp of the holding arrangement. DESCRIPTION OF EXAMPLE EXECUTION FORMS

[0026] Detailed reference will now be made to the examples shown in the accompanying drawings. Where possible, the same reference numbers are used in the drawings to refer to identical or similar parts. Directional terms such as "above," "below," "right," and "left" are used to facilitate reference to the figures and are not intended to limit the scope of this disclosure.

[0027] In the past, various valve train designs were developed for use in internal combustion engines to control valve actuation, for example, during the main exhaust process. Generally, in a valve train system, a rocker arm assembly is connected on one side to a camshaft and on the other side, via a valve bridge, to a number of engine valves to transmit the actuating motion from the camshaft, through the valve bridge, to the downstream valves. In some scenarios, it may be desirable to provide an additional function, such as a compression engine brake, in addition to the main lift operation, so that a selected valve can be controlled separately.For example, to enable engine braking and assist the vehicle during deceleration, the valve train system can operate by releasing compression in the engine cylinders during the compression stroke, thereby reducing engine power and generating a braking effect. In other words, this can cause the engine to act as an energy-consuming compressor, slowing the vehicle down. To increase flexibility for different valve action profiles, such as exhaust and engine braking, variable valve actuation (VVA) technology can be employed, allowing for variable valve control with respect to timing, duration, stroke, or other desired functions.As an example, and without limitation, VVA types may include valve control, cam switching, variable valve control and stroke control, variable valve control duration, or other suitable control schemes to achieve valve actuation.

[0028] Fig. Figure 1 shows an example of a valve train system 100. In certain embodiments, the valve train system 100 can include a split rocker arm 102 and an engine brake rocker arm 104. The split rocker arm 102 and the engine brake rocker arm 104 can operate independently or in a coordinated manner to achieve variable valve timing (VVT). In certain embodiments, the split rocker arm 102 can be pivotally mounted on a rocker arm shaft (not shown) extending through an opening 106 in the split rocker arm 102, allowing the split rocker arm 102 to rotate about the rocker arm shaft based on the rotation of a first cam 108. In particular, in certain embodiments, a cam end 110 of the split rocker arm 102 can be coupled to the first cam 108 to receive a valve actuation motion.A foot end 112 (also referred to as valve end) opposite the cam end 110 of the split rocker arm 102 can be configured to be coupled to a valve bridge 114 to selectively transmit the motion from the first cam 108 to one or more engine valves, such as a first valve 116 and a second valve 118, coupled to the valve bridge 114.

[0029] In certain embodiments, the split rocker arm 102 can have an inner body 120 and an outer body 122, which is forked to flank the inner body 120. The inner body 120 can have the cam end 110 for receiving the movement from the first cam 108, while the outer body 122 can have the foot end 112 for actuating the valve bridge 114. In certain embodiments, a locking arrangement 124 can be provided, which can, for example, be received in one or more openings provided in the inner body 120 and the outer body 122. In certain embodiments, the locking arrangement 124 can be selectively switched between a locked position and an unlocked position.For example, in the locked position, the locking arrangement 124 can be controlled to lock the inner body 120 to the outer body 122, allowing the inner body 120 and the outer body 122 to move as a unit, thereby transmitting the motion from the first cam 108 via the split rocker arm 102 to the valve bridge 114. In the unlocked position, the locking arrangement 124 can be controlled to release the inner body 120 from the outer body 122, so that the outer body 122 generally remains stationary regardless of the movement of the inner body 120. In other words, the motion from the first cam 108 can be absorbed by the relative motion between the inner body 120 and the outer body 122. Consequently, in this configuration, the actuating motion to the valve bridge 114 is deactivated or lost.To facilitate variable valve timing (VVT), proper switching of the locking arrangement may be desirable to activate and / or deactivate the split rocker arm 102 at the appropriate time. In certain embodiments, a spring 126 may be provided on the split rocker arm 102, with one end of the spring 126 connected to the inner body 120 and the other end to the outer body 122 to dampen the relative movement between the inner body 120 and the outer body 122. It is understood that the locking arrangement described herein is for illustrative purposes only and is not intended to limit the scope of this disclosure. Although this disclosure describes a particular rocker arm with a particular locking arrangement for achieving variable valve timing (VVT), this disclosure includes all suitable rocker arms with all suitable locking arrangements for achieving VVT.

[0030] In certain embodiments, the foot end 112 of the split rocker arm 102 can be configured to press against a central section of the valve bridge 114 when the foot end 112 moves downwards, thereby actuating both the first valve 116 and the second valve 118. This can occur, for example, during the main exhaust operation.

[0031] Fig. Figure 2 shows the valve train system 100 from the rear, with particular emphasis on the engine brake rocker arm 104. In certain embodiments, the engine brake rocker arm 104 can be pivotally mounted on the rocker arm shaft, which extends through an opening 202 of the engine brake rocker arm 104, so that the engine brake rocker arm 104 can rotate about the rocker arm shaft due to the rotation of a second cam 206. In particular, in certain embodiments, a cam end 204 of the engine brake rocker arm 104 can be coupled to the second cam 206 to receive the valve actuation movement. A brake lever arm end 208 (also referred to as valve end) opposite the cam end 204 of the engine brake lever arm 104 can be configured to be coupled to one end of the valve bridge 114 in order to selectively transmit the movement from the second cam 206 only to the second valve 118 which is connected to the engine braking, without actuating the first valve 116.

[0032] In certain embodiments, a valve coupling mechanism 210 can be movably mounted at the end of the valve bridge 114 to couple the second valve 118 to the valve bridge 114. For example, and without limitation, the valve coupling mechanism 210 can extend through an opening in the valve bridge 114, with one end of the valve coupling mechanism 210 coupled to the second valve 118 and the other end configured to engage with the brake lever arm end 208 of the engine brake lever arm 104 when the brake lever arm end 208 rotates downwards. In this way, during engine braking, the brake lever end 208 can press on the valve coupling mechanism 210 and move the valve coupling mechanism 210 relative to the valve bridge 114 to actuate the second valve 118 without actuating the first valve 116.For example, and without limitation, the valve coupling mechanism 210 may have one or more pins, a cylinder, a valve seat or other suitable features.

[0033] In certain embodiments, the brake lever end 208 of the engine brake lever 104 can be provided with an engine brake capsule 212, which can be configured, for example, to extend from or retract into the brake lever end 208. As an example, and without limitation, the engine brake capsule 212 can be prevented from coming into contact with the valve coupling mechanism 210 in the retracted position, even when the brake lever end 208 rotates downwards, thereby disabling the engine brake. In the extended position, the engine brake capsule 212 can press against the valve coupling mechanism 210 when the brake lever end 208 rotates downwards, thereby actuating the second valve 118 independently of the first valve 116.

[0034] It is understood that the valve train system described herein serves only for explanatory purposes and is not intended to limit the scope of this disclosure. Although this disclosure describes a valve train system with certain rocker arm configurations (such as the split rocker arm and the engine brake rocker arm) in a particular advantageous manner, this disclosure also includes valve train systems with any suitable rocker arm configurations in any suitable manner. For example, in certain embodiments, the valve train systems may include none, some, or all of the components disclosed herein. For example, in certain embodiments, the valve train system may include additional components not described herein without deviating from the scope of this disclosure.

[0035] In valve train systems configured with VVA capability, an undesired bridge displacement can occur, separating the valve bridge from one or more valves. For example, and without limitation, this can happen due to a critical unlocking of the locking assembly 124 of the split rocker arm 102. This critical unlocking can occur, for instance, during the valve stroke when the first valve 116 and the second valve 118 are actuated into an open position.In this case, for example, if the locking arrangement 124 is suddenly unlocked and the transmission of the valve actuation force is interrupted, the valves, such as the first valve 116, can spring upwards under the preload force of a valve spring 128, thereby flinging the valve bridge 114 away from the first valve 116 in an uncontrolled manner to such an extent that the valve bridge 114 is dislodged from or separated from the first valve 116. To prevent or at least minimize such dislodgement of the bridge and to ensure proper system dynamics, a retaining arrangement may be provided in certain embodiments to hold the valve bridge on one or more valves, as described in more detail below.

[0036] The Fig. Figures 3-5 show an example of a holding arrangement 302 according to certain embodiments of this disclosure. In certain embodiments, the holding arrangement 302 can be configured to mechanically hold the valve bridge 114 against the first valve 116 when the first valve 116 is inserted into the valve bridge 114. In certain embodiments, the valve bridge 114 can have a first opening 304 for receiving the first valve 116 and a second opening 306 for receiving the second valve 118. In certain embodiments, the holding arrangement 302 can be received by the first opening 304 and configured to engage with the first valve 116 when the first valve 116 is inserted into the first opening 304, in order to prevent the valve bridge 114 from separating from the first valve 116.As an example, and without limitation, the valve manifold 114 can be provided with the retaining device 302, which is already mounted in the first opening 304, for the customer's convenience. Alternatively, the retaining device 302 can be provided separately if required. To connect the valve manifold 114 to the first valve 116, the customer can simply press the valve manifold 114 onto the first valve 116, so that the end of the first valve 116 is received by the first opening 304 and held in place by the retaining device 302 within the first opening 304.

[0037] In certain embodiments, as better described in the Fig. 4 and Fig. As shown in Figure 5, the retaining arrangement 302 can include a pressure nut 402 and a ring 404 on which the pressure nut 402 can be positioned. In certain embodiments, the pressure nut 402 can be configured to mechanically hold the first valve 116 in the first opening 304 of the valve bridge 114. In certain embodiments, the ring 404 can be configured to support and hold the pressure nut 402 within the first opening 304. By way of example, and without limitation, the ring 404 can be dimensioned with a sufficient diameter to engage with the wall of the first opening 304 and prevent the pressure nut 402 from protruding from the first opening 304.

[0038] In certain embodiments, such as in Fig. As shown in Figure 4, the first opening 304 can have an upper housing 406 and a lower housing 408. The upper housing 406 can be configured to accommodate the end of the first valve 116. The lower housing 408 can be configured to accommodate the retaining assembly 302. In certain embodiments, the lower housing 408 can generally have a frustoconical shape, for example, to accommodate deformation of the pressure nut 402 during installation. In certain embodiments, the lower housing 408 can be provided with a groove 410 for receiving the ring 404.

[0039] In certain embodiments, the first valve 116 may have a groove 412 near its end. For example, and without limitation, the groove 412 may be configured to engage with components of the retaining assembly 302, such as the pressure nut 402, to hold and secure it. For example, and without limitation, an upper edge of the pressure nut 402 may be configured to engage with an upper edge of the groove 412 after assembly, thereby mechanically holding the first valve 116 in its position within the first opening 304 and preventing it from moving out of the first opening 304.

[0040] Fig. Figure 6 shows a perspective view of the pressure nut 402. In certain embodiments, the pressure nut 402 may have a central opening 602 for receiving the end of the first valve 116 and several internal teeth 604 extending inward from the central opening 602. When the first valve 116 is inserted through the central opening 602, the internal teeth 604 can be positioned in the groove 412 of the first valve 116. In certain embodiments, the internal teeth 604 may have a spring-like property. For example, and without limitation, when the end of the first valve 116 is inserted, a wider section of the end of the first valve 116 may press against or expand the internal teeth 604. The spring-like property of the internal teeth 604 may cause the internal teeth 604 to automatically contract around the groove 412 of the first valve 116.In certain embodiments, the inner teeth 604 can form a rounded contact surface to engage with the first valve 116. For example, and without limitation, the rounded contact surface can allow the first valve 116 to slide onto the inner teeth 604. In certain embodiments, an inner diameter can be defined by the inner teeth 604 or, more specifically, by the rounded contact surface formed by the inner teeth 604. For example, and without limitation, the inner diameter can be equal to or slightly larger than the diameter at the groove 412, but smaller than the diameter of the wider section of the valve end. In this way, the inner teeth 604 can be configured to engage in the upper edge of the groove 412 to mechanically retain the first valve 116.Alternatively, for example, but not limited to, the inner diameter formed by the inner teeth 604 in an original, unassembled state can be smaller than the diameter at the groove 412, so that the inner teeth 604 can engage with the first valve 116 to hold it by friction and resist removal. For example, and without limitation, the inner teeth 604 can be slightly inclined upwards towards the center to facilitate insertion of the first valve 116 and to counteract separation. In other words, the inner teeth 604 can, for example, be inclined in the same direction as the direction of movement of the first valve 116 when the first valve 116 is inserted, and in the opposite direction to the direction of movement of the first valve 116 when the first valve 116 is withdrawn from the valve bridge 114.In certain embodiments, the outer diameter of the pressure nut 402 can be equal to or slightly smaller than the base diameter of the lower housing 408. This allows the pressure nut 402 to slide easily into the lower housing 408 during installation. In certain embodiments, the push nut 402 can be elastic, allowing for slight deformation of the push nut 402 when it is pushed onto the first valve 116. For example, and without limitation, the push nut 402 can be made of an elastic metal such as spring steel, stainless steel, or other suitable elastic materials.

[0041] Fig. Figure 7 shows a perspective view of the ring 404. In certain embodiments, the ring 404 can be open and have a gap 702, which allows the ring 404 to be easily inserted into the first opening 304. As an example, and without limitation, the ring 404 can be compressed during installation, after the pressure nut 402 has been inserted into the lower housing 408 of the first opening 304, to fit into the lower housing 408. Once in place, the ring 404 can snap back into its original shape and engage in the groove 410 of the lower housing 408. In this way, the pressure nut 402 can sit on the ring 404 after assembly and be held in position within the first opening 304 by the ring 404. In certain embodiments, the ring 404 can be configured as a circlip, clip, retaining ring, or other suitable retaining arrangement.In certain embodiments, the ring 404 can be elastic, allowing for slight deformation during installation. For example, and without limitation, the ring 404 can be made of an elastic metal such as spring steel, stainless steel, etc. Alternatively, and again without limitation, the ring 404 can be made of plastic or other suitable materials with the desired elasticity, strength, and durability.

[0042] In certain embodiments, if the removal of the valve bridge 114 is desired, for example for maintenance or repair purposes, this can be achieved by breaking the ring 404 and / or the pressure nut 402 to separate the valve bridge 114 from the first valve 116.

[0043] The Fig. Figures 8-10 show an example of a holding arrangement 802 according to certain embodiments of this disclosure. The holding arrangement 802 may have similar features and components as described above with reference to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. The retaining arrangement 802, as described in Section 7, can be compatible with various embodiments disclosed herein. In certain embodiments, it can be configured to mechanically and frictionally hold the valve bridge 114 against the first valve 116 when the first valve 116 is inserted into the valve bridge 114. In certain embodiments, the retaining arrangement 802 can be received by the first opening 304 and configured to engage with the first valve 116 when the first valve 116 is inserted into the first opening 304, thus preventing the valve bridge 114 from separating from the first valve 116. By way of example, and without limitation, the valve bridge 114 can be provided with the retaining arrangement 802 already mounted in the first opening 304 for the customer's convenience. Alternatively, the retaining arrangement 802 can be provided separately if required.To connect the valve bridge 114 with the first valve 116, the customer can simply press the valve bridge 114 onto the first valve 116, so that the end of the first valve 116 is received by the first opening 304 and secured in the first opening 304 by the retaining arrangement 802.

[0044] In certain embodiments, such as in the Fig. 9 and Fig. As can be seen more clearly in Figure 10, the retaining arrangement 802 can include a pressure nut 902, a ring 904 on which the pressure nut 902 can be positioned, and a wire clamp 906 for holding the ring 904 and the pressure nut 902 in place within the first opening 304. In certain embodiments, the pressure nut 902 can be configured to be frictionally coupled to the first valve 116 when it is inserted into the first opening 304 of the valve bridge 114. In certain embodiments, the ring 904 can be configured to support the pressure nut 902. In certain embodiments, the wire clamp 906 can be configured to be removably received by the first opening 304 and to support the ring 904 and the pressure nut 902 thereon. As an example, and without limitation, the wire clamp 906 can be easily accessible from the outside, allowing the wire clamp 906 to be removed from the first opening 304.

[0045] In certain embodiments, such as in Fig. As shown in Figure 9, the first opening 304 can have an upper housing 908 and a lower housing 910. The upper housing 908 can be configured to accommodate the end of the first valve 116. The lower housing 910 can be configured to accommodate the retaining assembly 802. In certain embodiments, the lower housing 910 can generally have a circular shape with a larger diameter than the upper housing 908 to accommodate components of the retaining assembly 802. In certain embodiments, the lower housing 910 can be provided with a groove 912 to receive and support the wire clamp 906.

[0046] In certain embodiments, the lower housing 910 may further comprise a window 914 to provide access to the wire clamp 906. For example, and without limitation, the window 914 may be arranged longitudinally and extend through the wall of the valve bridge 114. A portion of the wire clamp 906 may protrude from the window 914 and be exposed to the outside. This allows a user easy access to the wire clamp 906 in order to remove the wire clamp 906 and thus the valve bridge 114 without damaging any components of the retaining assembly 802, as described in more detail below.

[0047] In certain embodiments, the first valve 116 may be provided near its end with a groove, slot, or other recess to accommodate one or more components of the holding assembly 802. In certain embodiments, the end of the first valve 116 may be rounded, chamfered, conical, or otherwise structured to facilitate insertion of the first valve 116 into the holding assembly 802.

[0048] Fig. Figure 11 shows a perspective view of the pressure nut 902. In certain embodiments, the pressure nut 902 may have a central opening 1102 for receiving the end of the first valve 116 and several internal teeth 1104 extending downwards from the central opening 1102. In other words, the internal teeth 1104 may, for example, extend in the opposite direction to the movement of the first valve 116 when the first valve 116 is inserted, and in the same direction to the movement of the first valve 116 when the first valve 116 is withdrawn from the valve bridge 114. In certain embodiments, the internal teeth 1104 may be curved towards the center, so that the internal teeth 1104 define a doubly conical or hourglass shape.When the first valve 116 is inserted through the central opening 1102, the inner teeth 1104, with their curved profiles, can press firmly around portions of the first valve 116 with a reduced diameter, thus securely gripping the first valve 116 by friction and resisting pull-out. In certain embodiments, the outer diameter of the pressure nut 902 can be equal to or slightly smaller than the base diameter of the lower housing 910. This allows the pressure nut 902 to slide easily into the lower housing 910 during installation. In certain embodiments, the pressure nut 902 can be elastic, allowing for slight deformation of the pressure nut 902 when it is pressed onto the first valve 116. By way of example, and not as a limitation, the pressure nut 902 can be made of elastic metal such as spring steel, stainless steel, or other suitable elastic materials.In certain embodiments, the pressure nut 902 may have one or more features or components of the pressure nut 402 described above with reference to the . Fig. 3-7 described, and can be used interchangeably with the pressure nut 402.

[0049] Fig. Figure 12 shows a perspective view of the ring 904. In certain embodiments, the ring 904 may be closed. By way of example, and without limitation, the ring 904 may be an O-ring or another suitable retaining element. In certain embodiments, the outer diameter of the ring 904 may be equal to or slightly smaller than the base diameter of the lower housing 910. In this way, the ring 904 may easily slide into the lower housing 910 below the pressure nut 902 during installation. In certain embodiments, the ring 904 may have a stop platform 1202, which may be configured to mechanically support the inner teeth 1104 of the pressure nut 902. By way of example, and without limitation, when the pressure nut 902 moves downwards (e.g.,Due to movement of the first valve 116 or the valve bridge 114, the internal teeth 1104 rest on the stop platform 1202 and are prevented from moving further downwards. In certain embodiments, the ring 904 can be made of metal, such as stainless steel, etc. Alternatively, the ring 404 can be made of plastic or other suitable materials with the desired strength and durability, for example, but not limited to.

[0050] Fig.Figure 13 shows a perspective view of the wire clamp 906. In certain embodiments, the wire clamp 906 may have two sides 1302 and 1304, which are generally flat and straight. In certain embodiments, a distance D1 between the sides 1302 and 1304 may be dimensioned smaller than the outer or inner diameter of the ring 904 and / or the pressure nut 902 in order to support the ring 904 and / or the pressure nut 902 and prevent them from slipping out of the first opening 304. In certain embodiments, the wire clamp 906 may have two outwardly projecting legs 1306 and 1308. By way of example, and without limitation, the two legs 1306 and 1308 may be configured to extend out of the window 914 when inserted into the first opening 304. This allows a user to easily access the wire clamp 906, for example to remove the valve bridge 114.As an example, and without limitation, the user can, during installation, squeeze the legs 1306 and 1308 together so that the wire clamp 906 can be deformed and compressed to fit into the lower housing 910. Once in place, the wire clamp 906 can snap back into its original shape and engage in the groove 912 of the lower housing 910. In this way, the wire clamp 906 can support the ring 904 and / or the pressure nut 902, with the sides 1302 and 1304 preventing the ring 904 and / or the pressure nut 902 from slipping out of the first opening 304. The valve bridge 114 can then be pressed onto the first valve 116, so that the first valve 116 is securely held in the first opening 304 by the retaining arrangement 802.

[0051] In certain embodiments, if the valve bridge 114 needs to be removed from the first valve 116, for example during maintenance or servicing, the user can again squeeze the legs 1306 and 1308 exposed through the window 914 together, so that the wire clamp 906 is compressed and released from the groove 912. The wire clamp 906 can then be removed from the first opening 304, thereby releasing the valve bridge 114 from the first valve 116. This increases convenience and reduces maintenance costs, as the user no longer needs to damage any components of the retaining assembly 802 when removing the valve bridge 114. In other words, the retaining assembly 802 can remain intact after removal and be reused the next time. Alternatively or additionally, the user can break the wire clamp 906 or other components of the retaining assembly 802 for removal, if desired.

[0052] In certain embodiments, the wire clamp 906 can be elastic, allowing it to deform during installation. For example, and without limitation, the wire clamp 906 can be made of an elastic metal such as spring steel, stainless steel, etc. Alternatively, and again without limitation, the wire clamp 906 can be made of plastic or other suitable materials with the desired elasticity, strength, and durability.

[0053] In certain embodiments, components of the holding arrangement 802 and components of the holding arrangement 302 can be compatible and interchangeable. In this respect, for example, but not limited to, the pressure nut 402, which can be configured to mechanically hold the first valve 116, and the ring 404, which can be open, can be used in combination with the wire clamp 906 without departing from the scope of this disclosure.

[0054] Here, "or" is inclusive and not exclusive unless expressly stated otherwise or the context makes it clear. Therefore, "A or B" here means "A, B, or both" unless expressly stated otherwise or the context makes it clear. Furthermore, "and" is both jointly and severally liable and individually liable unless expressly stated otherwise or the context makes it clear. Therefore, "A and B" here means "A and B, jointly and severally or individually" unless expressly stated otherwise or the context makes it clear.

[0055] The scope of this disclosure includes all changes, substitutions, variations, alterations, and modifications of the embodiments described or illustrated herein that a person skilled in the art would understand. The scope of this disclosure is not limited to the embodiments described or illustrated herein. Although this disclosure of embodiments comprehensively describes and represents the respective embodiments herein as specific components, elements, features, functions, processes, or steps, each of these embodiments may include any combination or permutation of the components, elements, features, functions, processes, or steps described or illustrated herein that a person skilled in the art would understand. Furthermore, the reference in the appended claims to a device or system, or a component of a device or system, includes...that which is adapted, arranged, capable, configured, activated, operational, or functional to perform a particular function, this device, system, or component, regardless of whether that particular function is activated, switched on, or unlocked, as long as this device, system, or component is suitable, designed, capable, configured, activated, operational, or functional for that purpose. Although certain embodiments are described or presented in this disclosure as offering certain advantages, certain embodiments may offer none, some, or all of these advantages. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 63 / 515,933

[0001]

Claims

[1] A rocker arm assembly configured for variable valve actuation, wherein the rocker arm assembly comprises: at least one rocker arm; a first valve and a second valve; a valve bridge configured to be actuated by at least one rocker arm, and having a first opening and a second opening for receiving the first valve and the second valve respectively; and a holding arrangement which is at least partially received by the first opening of the valve bridge, wherein the holding arrangement comprises: a pressure nut; and a ring to hold the pressure nut wherein the holding arrangement is configured to hold the first valve when the first valve is inserted into the first opening to prevent separation of the valve bridge from the first valve. [2] Rocker arm arrangement according to claim 1, wherein the holding arrangement is configured to mechanically hold the first valve when the first valve is inserted into the first opening. [3] Rocker arm arrangement according to claim 1, wherein the retaining arrangement is configured to hold the first valve by friction when the first valve is inserted into the first opening. [4] Toggle lever arrangement according to any one of claims 1 to 3, wherein the pressure nut has a central opening and a plurality of internal teeth extending from the central opening. [5] Toggle lever arrangement according to one of claims 1 or 2, wherein the pressure nut has a central opening and a plurality of internal teeth extending inwards from the central opening and inclined upwards towards the center. [6] Toggle lever arrangement according to one of claims 1 or 3, wherein the pressure nut has a central opening and a plurality of internal teeth extending downwards from the central opening. [7] Toggle lever arrangement according to one of claims 1, 2 or 5, wherein the ring has an open loop. [8] Rocker arm arrangement according to one of claims 1, 3 or 6, wherein the ring is closed. [9] Rocker arm arrangement according to any one of claims 1 to 8, wherein the first opening has an upper housing for receiving one end of the first valve and a lower housing for receiving the retaining arrangement. [10] Rocker arm arrangement according to claim 9, wherein the lower housing has a frustoconical or circular structure. [11] Toggle lever arrangement according to one of claims 1, 2, 5 or 7, wherein the first opening has a groove for holding the ring. [12] Toggle lever arrangement according to one of claims 1, 3, 6 or 8, wherein the holding arrangement further comprises a wire clamp for holding the ring. [13] Toggle lever arrangement according to claim 12, wherein the first opening of the valve bridge has a side with a window configured such that part of the wire clamp is accessible when the wire clamp is inserted into the first opening, wherein the part of the wire clamp accessible through the window can be actuated to open and close the wire clamp. [14] Rocker arm arrangement according to any one of claims 1 to 13, wherein one end of the first valve has a groove configured to rest against the pressure nut when the first valve is inserted into the opening. [15] Rocker arm arrangement according to any one of claims 1 to 14, wherein the at least one rocker arm has a locking arrangement configured to be able to switch between a locked position and an unlocked position, wherein the retaining arrangement is configured to resist separation of the valve bridge from the first valve when the locking arrangement switches. [16] A valve bridge of a rocker arm assembly configured for variable valve actuation, wherein the valve bridge comprises: a first opening and a second opening for receiving a first valve and a second valve respectively; and a holding arrangement which is at least partially received by the first opening of the valve bridge, wherein the holding arrangement comprises: a pressure nut; and a ring to hold the pressure nut wherein the holding arrangement is configured to hold the first valve when the first valve is inserted into the first opening to prevent separation of the valve bridge from the first valve. [17] Valve bridge according to claim 16, wherein the first opening has an upper housing for receiving one end of the first valve and a lower housing for receiving the retaining arrangement. [18] Valve bridge according to claim 17, wherein the lower housing has a groove for engagement with the ring. [19] Valve bridge of a rocker arm assembly configured for variable valve actuation, wherein the valve bridge comprises: a first opening and a second opening for receiving a first valve and a second valve, respectively; and a holding arrangement which is at least partially received by the first opening of the valve bridge, wherein the holding arrangement comprises: a pressure nut; a ring to hold the pressure nut; and a wire clamp to hold the ring wherein the holding arrangement is configured to hold the first valve when the first valve is inserted into the first opening to prevent separation of the valve bridge from the first valve. [20] Valve bridge according to claim 19, wherein the first opening of the valve bridge has a side with a window configured such that part of the wire clamp is accessible when the wire clamp is inserted into the first opening, wherein the part of the wire clamp accessible through the window can be actuated to open and close the wire clamp.

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