Rocker arm assembly and valve mechanism system

Abstract

The utility model relates to a rocker arm assembly and a valve mechanism system. The rocker arm assembly is rotatable about a rocker arm shaft and includes a first portion and a second portion. The first portion is configured to receive a valve lift profile. The second portion is configured to operably engage with one or more valves. The rocker arm assembly also includes an actuator assembly switchable between a first state and a second state, and a plunger assembly disposed within the plunger bore and having a plunger axis angled to a longitudinal axis of the actuator assembly.

Description

[0001] Priority

[0002] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 493,680 filed on March 31, 2023 and U.S. Provisional Patent Application No. 63 / 501,331 filed on May 10, 2023 under 35 U.S.C. §119(e), which are incorporated herein by reference in their entirety. Technical Field

[0003] The present application relates to engine valve trains and, more particularly, to rocker arm assemblies used in engine valve train assemblies to facilitate engine braking functions. Background Art

[0004] An internal combustion engine may include a valvetrain, wherein in certain configurations, the engine valvetrain may include rocker arms for controlling the opening and closing of intake valves and / or exhaust valves.

[0005] Certain embodiments of the engine may include an engine braking system that may provide for advance and / or additional opening of the exhaust valve at start-up. For example, the exhaust valve may be opened additionally early when the piston in the cylinder may be near the top dead center (TDC) position of its compression stroke. Through such opening of the exhaust valve by the engine braking system, compressed gas may be released through compression release of the exhaust valve. This may cause the engine to act as a power consuming device, which may help to slow the vehicle. Summary of the invention

[0006] In a specific embodiment, a rocker arm assembly is disclosed that is capable of rotating about a rocker arm shaft and includes: a first portion configured to receive a valve lift profile; and a second portion configured to operably engage with one or more valves based on the valve lift profile, the second portion including: an actuator assembly that is capable of switching between a first state and a second state, the actuator assembly including a valve mechanism actuated by a control member; and a plunger assembly having a plunger having an angle with respect to a longitudinal axis of the actuator assembly. The piston assembly comprises: a slender member having a first end and a second end opposite to the first end; a piston pad slidably disposed at the first end of the slender member; and a gap adjustment mechanism associated with the second end of the slender member, wherein the control member of the actuator assembly is hydraulically actuated to act on the valve mechanism, and wherein based on the actuation of the actuator assembly, the piston pad can be selectively extended and retracted along the piston axis between a retracted position and an extended position relative to the slender member.

[0007] In a particular embodiment that may combine features of some or all of the above-described embodiments, the plunger assembly further comprises: a collar fixed to the plunger pad; and a plunger biasing member disposed between the first end of the elongated member and the collar, wherein the plunger biasing member is configured to bias the plunger pad toward the retracted position.

[0008] In a specific embodiment that may combine the features of some or all of the above embodiments, corresponding to the second state of the actuator assembly, a hydraulically based extension force is used to overcome a force associated with the plunger biasing member so that the plunger pad is extended to the extended position. In a specific embodiment that may combine the features of some or all of the above embodiments, the plunger biasing member comprises a spring.

[0009] In a particular embodiment that may combine features of some or all of the above-described embodiments, the inner surface of the plunger pad includes a stopper, and the elongated member of the plunger assembly also includes a locking assembly that is disposed proximal to the first end and is configured to engage with the stopper.

[0010] In a particular embodiment that may combine features of some or all of the above-described embodiments, corresponding to the second state of the actuator assembly, a hydraulically based extension force is used to overcome a stopping force associated with the engagement of the locking assembly with the stopper such that the plunger pad extends to the extended position.

[0011] In a specific embodiment that may combine the features of some or all of the above embodiments, the detent comprises a groove, and wherein the locking assembly comprises a protruding feature and a locking biasing member configured to bias the protruding feature toward the groove. In a specific embodiment that may combine the features of some or all of the above embodiments, the locking biasing member is disposed along a locking axis that is angled with the plunger axis. In a specific embodiment that may combine the features of some or all of the above embodiments, the clearance adjustment mechanism is accessible via an upper surface of the rocker arm assembly to facilitate clearance adjustment of the plunger assembly.

[0012] In a specific embodiment that may combine the features of some or all of the above embodiments, the clearance adjustment mechanism protrudes above the upper surface of the rocker arm assembly.In a specific embodiment that may combine the features of some or all of the above embodiments, the longitudinal axis of the actuator assembly is oriented perpendicular to the plunger axis.

[0013] In a specific embodiment that can combine the features of some or all of the above embodiments, the second portion further comprises an idler assembly configured to absorb at least a portion of the valve lift profile. In a specific embodiment that can combine the features of some or all of the above embodiments, the idler assembly comprises: an idler shaft movable in a hole arranged along the longitudinal axis of the idler assembly; and an idler biasing member configured to bias the idler shaft toward the one or more valves.

[0014] In a specific embodiment that may combine the features of some or all of the above embodiments, the longitudinal axis of the lost motion assembly is arranged parallel to the plunger axis of the plunger assembly.In a specific embodiment that may combine the features of some or all of the above embodiments, the first portion of the rocker arm assembly comprises a roller configured to engage with a cam to receive at least a portion of the valve lift profile.

[0015] In a specific embodiment that can combine the features of some or all of the above embodiments, corresponding to the first state of the actuator assembly, the valve mechanism is held open by the control member so that the plunger pad is retracted to the retracted position. In a specific embodiment that can combine the features of some or all of the above embodiments, the rocker arm assembly, the valve mechanism includes a check valve, and the check valve is biased against the hydraulic channel opening by a check valve biasing member.

[0016] In a particular embodiment which may combine features of some or all of the above embodiments, the control member comprises a control pin which is biased against the check valve by a control biasing member, the control member being movable along the longitudinal axis of the actuator assembly.

[0017] In a specific embodiment that can combine the features of some or all of the embodiments described above, a method for assembling a rocker arm assembly is disclosed, the method comprising: providing a plunger assembly located proximal to a valve engaging portion of the rocker arm assembly, the plunger assembly comprising an elongated member, a plunger pad slidably disposed at a first end of the elongated member, and a gap adjustment mechanism associated with a second end of the elongated member disposed opposite the first end; providing a hydraulic actuator assembly that is fluidly connected to the plunger assembly so that a longitudinal axis of the hydraulic actuator assembly is angled with a plunger axis of the plunger assembly; and configuring the second end of the elongated member to be accessible through an upper surface of the rocker arm assembly to facilitate gap adjustment of the plunger assembly.

[0018] In a specific embodiment that can combine the features of some or all of the embodiments described above, a valve mechanism system is disclosed, the valve mechanism system comprising: a cam, the cam being provided with a valve lift profile; one or more valves; a rocker arm shaft; and a rocker arm assembly, the rocker arm assembly being rotatable about the rocker arm shaft, the rocker arm assembly comprising: a first portion, the first portion being configured to receive the valve lift profile; and a second portion, the second portion being configured to operably engage with one or more of the valves based on the valve lift profile, the second portion comprising: an actuator assembly, the actuator assembly being switchable between a first state and a second state, the actuator assembly comprising A valve mechanism actuated by a control member; and a plunger assembly having a plunger axis angled with the longitudinal axis of the actuator assembly, the plunger assembly comprising: an elongated member having a first end and a second end opposite the first end; a plunger pad slidably disposed at the first end of the elongated member; and a gap adjustment mechanism associated with the second end of the elongated member, wherein the control member of the actuator assembly is hydraulically actuated to act on the valve mechanism, and wherein based on actuation of the actuator assembly, the plunger pad is capable of selectively extending and retracting relative to the elongated member along the plunger axis between a retracted position and an extended position. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described in more detail below based on the exemplary drawings. The present invention is not limited to these exemplary embodiments. Other features and advantages of various embodiments of the present invention will become apparent by reading the following detailed description with reference to the accompanying drawings, which show the following:

[0020] Figure 1A A schematic partial perspective view of an engine valve train assembly is shown according to certain embodiments.

[0021] Figure 1B Shows Figure 1A An enlarged cross-sectional view of an engine valve train assembly.

[0022] Figure 1C A schematic cross-sectional partial front view of an engine valve train assembly is shown with a plunger pad of the plunger assembly in a retracted position according to certain embodiments.

[0023] Figure 1D Shows Figure 1C Schematic diagram of an engine valve train assembly with the plunger pad in the extended position.

[0024] Figure 2A A schematic cross-sectional perspective view of an exemplary plunger assembly is shown with the plunger pad in a retracted position according to certain embodiments.

[0025] Figure 2B Shows Figure 2A Schematic diagram of an exemplary plunger assembly with the plunger pad in an extended position.

[0026] Figure 2C A schematic cross-sectional perspective view of a rocker arm assembly is shown according to certain embodiments.

[0027] Figure 3A A schematic perspective view of a rocker arm assembly is shown according to certain embodiments.

[0028] Figure 3B Shows Figure 3A Schematic cross-sectional side view of a rocker arm assembly.

[0029] Figure 4A A schematic cross-sectional side view of a plunger assembly according to certain embodiments is shown.

[0030] Figure 4B Shows Figure 4A Schematic cross-sectional front view of a plunger assembly.

[0031] Figure 4C A schematic cross-sectional side view of a plunger assembly according to certain embodiments is shown.

[0032] Figure 4D A schematic cross-sectional side view of a plunger assembly according to certain embodiments is shown.

[0033] Figure 4E Schematic exploded perspective views of certain plunger assembly components are shown according to certain embodiments.

[0034] Figure 5A A schematic cross-sectional top view of an actuator assembly is shown according to certain embodiments.

[0035] Figure 5B A schematic cross-sectional top view of an actuator assembly is shown according to certain embodiments.

[0036] Figure 5C Schematic exploded perspective views of certain actuator assembly components are shown according to certain embodiments.

[0037] Fig. 6A A schematic perspective view of a hydraulic supply system for an engine valve train assembly is shown according to certain embodiments.

[0038] Figure 6B A schematic perspective view of a hydraulic supply system for an exemplary rocker arm assembly is shown in accordance with certain embodiments.

[0039] Fig. 7AA schematic cross-sectional side view of an exemplary rocker arm assembly is shown depicting hydraulic supply to an actuator assembly, according to certain embodiments.

[0040] Figure 7B A schematic cross-sectional view of an exemplary rocker arm assembly is shown depicting hydraulic supply to a plunger assembly, according to certain embodiments.

[0041] Fig. 8A An actuator assembly is shown in a first state according to certain embodiments.

[0042] Figure 8B The plunger assembly is shown in a retracted position according to certain embodiments.

[0043] Fig. 9A The actuator assembly is shown in a second state according to certain embodiments.

[0044] Fig. 9B The plunger assembly is shown in an extended position according to certain embodiments.

[0045] It should be noted that the drawings provided may be schematically illustrated rather than literally or precisely illustrated; components and aspects of the drawings may not necessarily be drawn to scale. In addition, while in many cases the same reference numerals may represent corresponding parts in different views, the same parts may not always have the same reference numerals in each view. DETAILED DESCRIPTION

[0046] According to various embodiments of the present disclosure, rocker arm assemblies and related mechanisms, devices and methods are provided herein. Although the present disclosure may include specific embodiments with specific features and feature combinations and specific use cases to provide a better understanding, it will be understood that the present disclosure is not limited to these specific exemplary embodiments or use cases.

[0047] In certain embodiments, the engine valve train may include a rocker arm for controlling the opening and closing of an intake valve and / or an exhaust valve of the engine. In certain embodiments, the rocker arm may include a reciprocating body that may convert a rotational motion, such as a cam lobe from a rotating camshaft lobe, into a motion that may control the opening and closing of the valve. In certain embodiments, the rocker arm may be configured to rotate about a rocker arm shaft.

[0048] In certain embodiments, the rocker arm assembly may include a first portion configured to receive a valve lift profile. By way of example and not limitation, the first portion may include a cam end that is appropriately configured and / or arranged to directly or indirectly contact one or more rotating cams to receive the valve lift profile. By way of example and not limitation, the first portion of the rocker arm assembly may be operably engaged with a cam lobe of a rotating camshaft lobe, such as via a roller, a tappet, a push rod, or the like.

[0049] In certain embodiments, the rocker arm assembly may include a second portion that is suitably configured to operably engage one or more valves based on a valve lift profile received by the first portion. As an example and not limitation, the second portion of the rocker arm assembly may include a valve end or valve portion and is configured to interface directly or indirectly (e.g., via a valve bridge, sliding pin, swing, and / or connection platform) with one or more valves of the engine.

[0050] In certain embodiments, the engine valve train in general, and the rocker arm assembly in particular, may be configured to achieve a specific desired function of the engine operation. By way of example and not limitation, a certain embodiment of the engine valve train may include an engine braking system that, when activated, may provide an advance and / or additional opening of the exhaust valves relative to normal (i.e., engine brake off or drive mode) operation during an engine cycle, thereby providing the ability to decelerate the vehicle. In certain embodiments, a certain subset of the exhaust valves of the valve train having engine braking capability may be designated as engine braking valves. In certain embodiments, the engine braking valves may be switchably engaged to perform normal exhaust valve operation (when the drive mode, i.e., engine brake off mode, is engaged), or operate under a specific valve timing scheme to provide engine braking (when the engine braking mode is engaged).

[0051] In a specific embodiment, an engine cylinder configured for engine braking may be equipped with an integrated engine brake rocker arm, wherein the rocker arm may be configured to actuate a (non-braking) exhaust valve and an engine brake valve. As an example and not limitation, when the engine brake mode is engaged, the integrated engine brake rocker arm may apply an engine brake valve lift profile to the engine brake valve, and apply a normal exhaust valve lift profile when in the drive mode. In a specific embodiment, an engine cylinder configured for engine braking may be equipped with a dedicated engine brake rocker arm configured to actuate the engine brake valve. In a specific embodiment, the dedicated engine brake rocker arm may only actuate the engine brake valve. In a specific embodiment, the dedicated engine brake rocker arm may only actuate the engine brake valve when the engine brake mode is engaged.

[0052] Although specific embodiments of features, feature combinations, illustrations, and / or applications of rocker arm assemblies are described herein as non-limiting examples to provide a better understanding, the present disclosure contemplates any suitable combination and / or application of the features described herein. By way of example and not limitation, the application of the disclosed features is not limited to engine braking applications. By way of example and not limitation, various aspects of the plunger assembly features disclosed herein do not require combination with any type of actuator assembly and are fully contemplated as such. By way of example and not limitation, one or more features disclosed herein are contemplated in any suitable combination, in the context of integrated rocker arm assemblies and dedicated rocker arm assemblies, and other suitable rocker arm configurations.

[0053] With reference to the accompanying drawings, Figure 1A A schematic partial perspective view of an engine valve train assembly is shown according to certain embodiments. Figure 1B Shows Figure 1A In certain embodiments, the rocker arm assembly 200 may be configured to rotate about a rocker arm shaft 130 disposed within a rocker arm hole 132. As a non-limiting example, Figure 1A and Figure 1B As shown in , the valve train assembly 100 may include a rocker arm assembly 200 having a first portion 110 configured to receive a valve lift profile. In certain embodiments, the first portion 110 may be configured to receive the valve lift profile from a suitable assembly. By way of example and not limitation, the first portion 110 receives the valve lift profile from the cam 120 via a roller mechanism 125, such as in Figure 1B As an example and not limitation, the first portion 110 may be configured to receive a valve lift profile via a push rod mechanism (not shown).

[0054] In certain embodiments, the rocker arm assembly 200 may include a second portion 140 configured to operably engage one or more valves of the plurality of valves of the valvetrain assembly 100 based on a valve lift profile received by the rocker arm assembly 200 .

[0055] In certain embodiments, such as by way of example and not limitation, Figure 1A and Figure 1BAs shown in , the rocker arm assembly 200 can be configured as a dedicated exhaust rocker arm assembly. By way of example and not limitation, in a specific configuration in which the rocker arm assembly 200 can be configured as a dedicated exhaust rocker arm assembly, the rocker arm assembly 200 can be configured to operably engage with a specific subset of exhaust valves (such as the engine brake valves 165). By way of example and not limitation, in a specific configuration in which the rocker arm assembly 200 can be configured as a dedicated exhaust rocker arm, each cylinder can be additionally provided with a separate exhaust rocker arm assembly (such as the exhaust rocker arm assembly 204) to facilitate normal, non-engine braking related exhaust valve operation. By way of example and not limitation, the exhaust rocker arm assembly 204 (if present) can be configured to act on multiple exhaust valves (such as the main exhaust valve 160 and the engine brake valve 165) via a suitable mechanism (such as the common center portion 148 of the valve bridge 145). In a specific embodiment, the rocker arm assembly 200 can be configured to operably engage with the engine brake valve 165 via a suitable mechanism, such as the swing pin mechanism 155 (as a non-limiting example in Figure 1A and Figure 1B ) or a sliding pin 150 (as a non-limiting example in Fig. 9B ).

[0056] By way of example and not limitation, the sliding pin 150, the swing pin mechanism 155, and / or other suitable mechanisms may be configured to allow a suitable plunger of the rocker arm assembly 200 to engage the engine brake valve 165 without affecting normal operation of the main exhaust valve 160 and / or the valve bridge 145. In certain embodiments, the sliding pin 150, the swing pin mechanism 155, and / or other suitable mechanisms may be configured to maintain the valve bridge 145 in a horizontal, parallel, and / or other desired orientation, such as to allow a plunger of the rocker arm assembly 200 to engage the engine brake valve 165 without inadvertently applying valve lift to the main exhaust valve 160, and / or otherwise causing undesirable friction, stress, fatigue, and / or wear on the valve train.

[0057] In certain embodiments, the rocker arm assembly 200 may include a plunger assembly 210. In certain embodiments, the plunger assembly 210 may be configured as a switchable plunger assembly 210. In certain embodiments, the plunger assembly 210 may include a suitable plunger interface to engage with a valve interface. By way of example and not limitation, a suitable plunger interface may include a plunger pad 220. In certain embodiments, the rocker arm assembly 200 may include an actuator assembly 240 configured to switchably facilitate movement of a plunger surface (e.g., extension and / or retraction between a first position and a second position), such as movement of a plunger pad 220 of the plunger assembly 210.

[0058] Figure 1CA schematic cross-sectional partial front view of an engine valve train assembly is shown with a plunger pad of the plunger assembly in a retracted position according to certain embodiments. Figure 1D Shows Figure 1C Schematic diagram of an engine valve train assembly with the plunger pad in the extended position.

[0059] Figure 2A A schematic cross-sectional perspective view of an exemplary plunger assembly is shown with the plunger pad in a retracted position according to certain embodiments. Figure 2B Shows Figure 2A Schematic diagram of an exemplary plunger assembly with the plunger pad in an extended position.

[0060] It will be appreciated that while certain figures may illustrate specific embodiments of plunger assembly 210 and / or actuator assembly 240, alone or in combination with each other or with other rocker arms and / or valve train assembly elements, any suitable embodiments and / or combinations are fully contemplated herein. By way of example and not limitation, Figure 2A and Figure 2B Can be depicted relative to Figure 2C or Figure 4C The different embodiments of the plunger assembly 210 of the present invention are described in detail; these differences should not be construed as limiting the specific features, combinations, and / or applicability of any embodiment. As another non-limiting example, one embodiment of the plunger assembly 210 may be deployed in a rocker arm assembly 200 without a lost motion assembly (such as in Figure 2A and Figure 2B ), or may be deployed in combination with an idler assembly 270 (such as in Figure 3A and Figure 3B ).

[0061] In a particular embodiment, the plunger assembly 210 may include a selectively retractable plunger pad 220. In a particular embodiment, the plunger pad 220 may be retracted between a retracted position (away from the valve interface) and an extended position (toward the valve interface), such as based on the actuation of the actuator assembly 240. In a particular embodiment, the rocker arm assembly 200 may be configured so that when the engine braking mode is enabled, based on the energization and / or appropriate actuation of the actuator assembly 240, the plunger pad 220 of the plunger assembly 210 may be extended to operably engage with the engine braking valve 165. In a particular embodiment, in the extended position, the plunger pad 220 may be configured to be substantially rigid, i.e., to support and resist the forces received by contacting the corresponding valve interface. By way of example and not limitation, plunger pad 220 in an extended position, which may correspond to an energized or open actuator assembly 240 configuration and an engine braking mode, may be configured to contact swing pin mechanism 155 or sliding pin 150 to transfer at least a portion of the received valve lift profile to engine braking valve 165 .

[0062] In certain embodiments, the rocker arm assembly 200 may be configured such that when the engine brake mode is disabled (i.e., in the engine brake off or drive mode), upon de-energization and / or appropriate actuation of the actuator assembly 240, the plunger pad 220 of the plunger assembly 210 may retract and / or soften, fold, and / or become compliant so as not to apply and / or support forces relative to the engine brake valve 165. In certain embodiments, in the retracted position, the plunger pad 220 may be configured to be substantially folded, soft, and / or compliant, i.e., unable to support and / or resist forces generated by contact with the corresponding valve interface. As an example and not limitation, the plunger pad 220 in the retracted position corresponding to the de-energized or off actuator assembly configuration and the normal or drive mode (engine brake off) may be configured to fold under contact with the swing pin mechanism 155 or the sliding pin 150.

[0063] In certain embodiments, plunger assembly 210 may include an elongated member, such as shaft 214. In certain embodiments, plunger pad 220 may be slidably disposed at one end of shaft 214. By way of example and not limitation, plunger pad 220 may include a cavity, such as chamber 230, such that a suitably formed portion of shaft 214 may fit within the cavity. In certain embodiments, shaft 214 may be fixed in place, such as with nut 212. In certain embodiments, such as at least Figure 1B , Figure 1C , Figure 2A and Figure 4D as well as Figure 8B As shown in FIG. 1 as a non-limiting example, corresponding to the retracted position of the plunger assembly 210, the plunger pad 220 can slide on the fixed shaft 214 away from the valve interface. In certain embodiments, such as at least Figure 1D , Figure 2B and Fig. 9B As shown by way of non-limiting example, corresponding to the extended position of the plunger assembly 210 , the plunger pad 220 may slide on the fixed shaft 214 toward the valve interface.

[0064] Figure 2C A schematic cross-sectional perspective view of a rocker arm assembly is shown according to certain embodiments.

[0065] In certain embodiments, the plunger assembly 210 may include a plunger axis (PA) associated with the longitudinal axis of the shaft 214 and / or the axis of motion of the plunger pad 220. In certain embodiments, the actuator assembly 240 may include an actuator axis (AA) associated with the longitudinal axis of the actuator assembly 240. In certain embodiments, such as at least FIG. 2A to FIG. 2C and Figure 3AAs shown in FIG. 2 as a non-limiting example, the plunger axis of plunger assembly 210 may be angled and / or non-parallel to the longitudinal axis of actuator assembly 240. As an example and not limitation, the actuator axis of actuator assembly 240 may be disposed at a right angle to the plunger axis of plunger assembly 210.

[0066] In certain embodiments, the gap adjustment mechanism may be associated with one end of the elongated member of the plunger assembly 210. By way of example and not limitation, the gap adjustment mechanism may be associated with a second end of the shaft 214, which may be disposed opposite a first end configured to engage and / or operably connect with the plunger pad 220. In certain embodiments, the first end of the shaft 214 may be adjusted for calibration, maintenance, and / or adjustment (e.g., gap adjustment) based on temporarily loosening the nut 212 to set a desired longitudinal position of the shaft 214 within the bore of the plunger assembly 210. In certain embodiments, the gap adjustment mechanism may be accessible via an upper surface of the rocker arm assembly 200, for example, to facilitate gap adjustment of the plunger assembly 210. By way of example and not limitation, the gap adjustment mechanism may extend above the upper surface of the rocker arm assembly, for example, to facilitate access and maintenance.

[0067] Figure 3A A schematic perspective view of a rocker arm assembly is shown according to certain embodiments. Figure 3B Shows Figure 3A A schematic cross-sectional side view of a rocker arm assembly. In certain embodiments, such as in Figure 3A and Figure 3B As shown in FIG. 2 as a non-limiting example, the rocker arm assembly 200 may be configured as an integrated rocker arm assembly. As an example and not limitation, the rocker arm assembly 200 configured as an integrated rocker arm assembly may be configured to actuate multiple exhaust valves (e.g., the main exhaust valve 160 and the engine brake valve 165) for non-engine brake exhaust valve operation, and selectively actuate specific engine brake-related exhaust valves (e.g., only the engine brake valve 165) based on the engine brake valve lift scheme when the engine brake mode is engaged. In certain embodiments, such as when configured as an integrated engine brake rocker arm, the rocker arm assembly 200 may include a lost motion assembly 270.

[0068] In a particular embodiment, the idler assembly 270 may include one or more shafts and / or a screw coupled to the shaft. As an example and not limitation, the idler assembly 270 may include a screw 274 and an idler shaft 278 disposed in a hole of the idler assembly 270. In a particular embodiment, the screw 274 may include an adjustable clearance screw. In a particular embodiment, the screw 274 may be coupled to the nut 272. In a particular embodiment, the idler assembly 270 may be provided with an idler biasing member 276. As an example and not limitation, the biasing member 276 may include a spring. As an example and not limitation, the biasing member 276 may be used to absorb at least a portion of the valve lift profile received by the rocker arm assembly 200. In a particular embodiment, the idler shaft 278 may include a valve end configured to engage directly or indirectly with one or more valves. In a particular embodiment, the valve end of the idler shaft 278 may be configured to engage with a valve bridge, such as (e.g., the valve bridge 145 of the center portion 148). In certain embodiments, the valve end of the idler shaft 278 may include a suitable interface, such as a plunger end, a plunger pad, and / or an electronic foot (E-foot) (eg, E-foot 280).

[0069] In certain embodiments of the idler assembly 270, such as in Figure 3A and Figure 3B As depicted as one non-limiting illustrative example, idler shaft 278 may be configured to translate along a longitudinal idler axis (LMA) of idler assembly 270 .

[0070] In certain embodiments, such as in embodiments of the rocker arm assembly 200 configured as an integrated rocker arm assembly, the plunger assembly 210 configured to be switchable based on the actuator assembly 240 may be combined with the lost motion assembly 270 to selectively increase, decrease, and / or engage the main exhaust valve 160 and the engine brake valve 165 based on the received valve profile, so that the exhaust valve operation does not require a separate exhaust rocker arm assembly 204. In certain embodiments, the rocker arm assembly 200 may be configured to receive a valve lift profile including a composite valve profile (e.g., from a cam). As an example and not limitation, the composite valve profile may include a combination of valve lifts intended to operate a specific one or both of the main exhaust valve 160 and the engine brake valve 165 based on a selected mode (e.g., engine braking or driving). In certain embodiments, the composite valve profile may include a normal exhaust valve profile or a main exhaust valve profile and an engine brake valve profile.

[0071] By way of example and not limitation, such as in an exemplary integrated engine braking rocker arm, the rocker arm assembly 200 may receive a valve lift profile that includes a main lift segment, a modified approach and decline segment (i.e., opening and closing ramps) of the main lift segment based on engine braking demand, and / or one or more discrete engine braking lift segments. In a particular embodiment, the rocker arm assembly 200 may be configured such that the lost motion assembly 270 may absorb a portion of the composite valve lift profile corresponding to engine braking operation and only deliver a portion of the composite valve lift profile required for normal exhaust valve operation (i.e., non-engine braking operation, also referred to as a drive mode). In a particular embodiment, the lost motion assembly 270 may be configured to act on the valve bridge 145 to operate the main exhaust valve 160 and the engine braking valve 165. Thus, in a particular embodiment, the lost motion assembly 270 may be configured to receive a composite valve lift profile, absorb a portion of the profile corresponding to engine braking, and impart a valve lift profile corresponding to normal exhaust valve operation to both exhaust valves. In certain embodiments, such as described herein with respect to embodiments of the rocker arm assembly 200 configured as a dedicated rocker arm assembly, the plunger pad 220 may be actuated by the actuator assembly 240 to selectively engage the engine braking valve 165 when the engine braking mode is enabled.

[0072] In particular embodiments, the lost motion axis of lost motion assembly 270 may be oriented parallel to the plunger axis of plunger assembly 210 .

[0073] Figure 4A A schematic cross-sectional side view of a plunger assembly according to certain embodiments is shown. Figure 4B Shows Figure 4A Schematic cross-sectional front view of a plunger assembly.

[0074] In certain embodiments of the plunger assembly 210, contact of the plunger pad 220 with a corresponding valve interface (such as the swing pin mechanism 155 or the sliding pin 150) may exert significant forces, loads, shocks, pulses, and / or wear on the plunger assembly 210. While such contact may be desired when the plunger pad 220 is extended upon energization or switching on of the actuator assembly 240, in certain embodiments, when the plunger pad 220 is in a folded or pliable state upon de-energization of the actuator assembly 240, incidental contact between the plunger pad 220 and the corresponding valve interface may continue to occur because such embodiments may lack a positive means of adequately restraining, supporting, and / or maintaining the plunger pad 220 in a retracted position when the plunger pad 220 is folded or pliable.

[0075] In certain embodiments of the plunger assembly 210, such as in at least FIG. 4A to FIG. 4EAs shown in , the plunger assembly 210 may include a specific mechanism to secure, restrain, support and / or maintain the plunger pad 220 in a retracted position when the plunger pad 220 is folded or pliable. In certain embodiments, such a plunger securing mechanism may be configured to release and / or allow extension of the plunger pad 220 based on the actuator assembly 240 (such as due to the extension force applied by the actuator assembly 240 when powered on or turned on).

[0076] In certain embodiments of the plunger assembly 210, the first end of the shaft 214 configured to operably engage the plunger pad 220 may include a locking assembly. By way of example and not limitation, the locking assembly of the plunger assembly 210 may include one or more retractable and / or protruding locking features, such as one or more locking balls 216. By way of example and not limitation, the locking balls 216 or other suitable locking features may be biased outwardly from the first end of the shaft 214 by one or more locking biasing members, and / or biased toward a corresponding receiving feature of the plunger pad 220.

[0077] Figure 4C A schematic cross-sectional side view of a plunger assembly according to a particular embodiment is shown. By way of example and not limitation, the locking biasing member may include a spring 218 (such as in Figure 4A As an example and not limitation, the locking biasing member may include a plurality of springs (e.g., as in Figure 4C In certain embodiments, each of the one or more locking biasing members may be disposed along a locking axis (LA) that is angled with respect to the plunger axis (PA) of the plunger assembly 210. By way of example and not limitation, such as in Figure 4A As shown in FIG, the locking axis of the plunger assembly 210 can be oriented perpendicular to the plunger axis.

[0078] In certain embodiments of the plunger assembly 210, the inner surface of the plunger pad 220 may include a receiving feature that is configured to receive and / or engage with a corresponding locking feature of a locking assembly associated with the shaft 214. By way of example and not limitation, such as in Figure 4A and Figure 4B As shown in FIG, the inner surface of the plunger pad 220 may include a stopper, such as a groove 219 .

[0079] In certain embodiments of the plunger assembly 210, the locking assembly may be configured such that one or more suitable locking features and / or receiving features distributed between the shaft 214 and the plunger pad 220 engage to hold the plunger pad 220 in the retracted position when the actuator assembly 240 is de-energized and / or in a closed state, but are released when the actuator assembly 240 is energized or turned on to allow the plunger pad 220 to be extended to the extended position. By way of example and not limitation, the extension force associated with the energization or turning on of the actuator assembly 240 may be configured to apply a force sufficient to overcome the locking and / or holding force applied by the locking assembly of the plunger assembly 210, for temporarily holding the plunger pad 220 in the retracted position when the actuator assembly 240 is closed, thereby allowing the plunger pad 220 to be extended to the extended position.

[0080] In certain embodiments, the plunger assembly 210 may include a clip 222, such as to provide a longitudinal limit or limit to the extension of the plunger pad 220. In certain embodiments, the plunger assembly 210 may include one or more shims, such as shims 224, such as to adjust one or more longitudinal travel limits of the plunger pad 220.

[0081] Figure 4D A schematic cross-sectional side view of a plunger assembly according to certain embodiments is shown. Figure 4E Schematic exploded perspective views of certain plunger assembly components are shown according to certain embodiments.

[0082] In certain embodiments of the plunger assembly 210, such as in Figure 4D As shown in FIG. 2 as a non-limiting example, the plunger assembly 210 may include a plunger biasing member 226. In certain embodiments, the plunger biasing member 226 may be configured to bias the plunger pad 220 toward the retracted position. As an example and not a limitation, the plunger biasing member 226 may include a spring. In certain embodiments, the plunger assembly 210 may include a suitable retaining feature, such as a collar 221, which is configured to support and / or retain the plunger biasing member 226. In certain embodiments, the plunger biasing member 226 may be disposed between a first end of an elongated member (e.g., shaft 214) of the plunger pad 220 (located proximal to the plunger pad 220) and a retaining feature (e.g., collar 221) of the plunger biasing member 226. In certain embodiments of the plunger assembly 210, the extension force applied based on the actuator assembly 240 being energized or turned on may be sufficient to overcome the biasing force applied by the plunger biasing member 226 to bias and / or retain the plunger pad 220 in the retracted position.

[0083] It will be appreciated that although specific plunger retaining mechanisms are illustrated herein as non-limiting examples in combination with specific types of actuator assemblies and / or actuator assemblies 240, the features and functionality of any plunger retaining assemblies disclosed herein are fully contemplated in the context of securing any suitable type of plunger and / or for any suitable application, and are not limited to specific types of plunger mechanisms or diaphragms, or engine valve trains and / or engine braking applications.

[0084] In certain embodiments, the actuator assembly 240 can be switched between a first state and a second state. In certain embodiments, the first state of the actuator assembly 240 can correspond to a de-energized and / or closed state of the actuator assembly 240. In certain embodiments, the second state of the actuator assembly 240 can correspond to a powered and / or open state of the actuator assembly 240. In certain embodiments, the actuator assembly 240 can include a valve mechanism. In certain embodiments, the actuator assembly 240 can include a control member, such as for engaging with the valve mechanism.

[0085] In certain embodiments, the actuator assembly 240 may include a suitable actuation mechanism configured to selectively extend and retract a plunger assembly, such as a plunger pad 220 of the plunger assembly 210. In certain embodiments, the actuator assembly 240 may include an electromagnetic actuation assembly configured to selectively extend and retract (e.g., using a solenoid) the plunger pad 220 of the plunger assembly 210. Although specific actuator assemblies are described in greater detail herein as non-limiting illustrations, the present disclosure fully contemplates any suitable actuator assembly for performing the functions disclosed herein.

[0086] In certain embodiments, the actuator assembly 240 may include a hydraulic actuation assembly configured to selectively extend and retract the plunger pad 220 of the plunger assembly 210. In certain embodiments, the control member of the actuator assembly 240 may be hydraulically actuated to act on the valve train of the actuator assembly 240.

[0087] Figure 5A A schematic cross-sectional top view of an actuator assembly is shown according to certain embodiments. Figure 5B A schematic cross-sectional top view of an actuator assembly is shown according to certain embodiments. Figure 5C Schematic exploded perspective views of certain actuator assembly components are shown according to certain embodiments.

[0088] In certain embodiments, the actuator assembly 240 can be formed and / or assembled within a hole or cavity of the rocker arm assembly 200. In certain embodiments, the actuator assembly 240 can be contained within the rocker arm assembly 200 after modular assembly (such as using a locking screw 245).

[0089] In certain embodiments, the actuator assembly 240 may include an upper chamber 242. In certain embodiments, the actuator assembly 240 (e.g., the upper chamber 242) may be connected in fluid communication with a controllable high-pressure hydraulic fluid line, such as through a hydraulic supply inlet 260. In certain embodiments, the actuator assembly 240 may include a lower chamber 244. In certain embodiments, the lower chamber 244 may be controllably separated from the upper chamber 242, such as through a check valve 246. In certain embodiments, the check valve 246 may include a check valve housing 247. In certain embodiments, the actuator assembly 240 (e.g., the lower chamber 244) may be connected in fluid communication with the plunger assembly 210, such as via a hydraulic actuation passage 264.

[0090] In certain embodiments, the check valve 246 may include a check ball 248 or other suitable valve member. In certain embodiments, the check ball 248 may be supported by a check ball retainer 249. By way of example and not limitation, the check ball 248 may be biased against the flow passage of the check valve 246 (e.g., by a ball biasing member 254) such that the check ball 248 may be used to close the flow passage unless the check ball 248 is acted upon externally.

[0091] In certain embodiments, the plunger assembly 210 may include a control member, such as a control pin 250. In certain embodiments, the control pin 250 may be supported by a retainer 256. In certain embodiments, the control pin 250 may be positionally limited and / or adjustable, such as by a clip 258. In certain embodiments, the control pin 250 may be biased toward the check ball 248 by a control pin biasing member 252. In certain embodiments, the control pin biasing member 252 may include a spring. In certain embodiments, the ball biasing member 254 may include a spring. In certain embodiments, the longitudinal axis of the actuator assembly 240 may be oriented along the axis of motion of the control pin 250.

[0092] Fig. 6A A schematic perspective view of a hydraulic supply system for an engine valve train assembly is shown according to certain embodiments. Figure 6B A schematic perspective view of a hydraulic supply system for an exemplary rocker arm assembly is shown in accordance with certain embodiments.

[0093] Fig. 7A A schematic cross-sectional side view of an exemplary rocker arm assembly is shown depicting hydraulic supply to an actuator assembly, according to certain embodiments. Figure 7B A schematic cross-sectional view of an exemplary rocker arm assembly is shown depicting hydraulic supply to a plunger assembly, according to certain embodiments.

[0094] In certain embodiments, the hydraulic supply inlet 260 of the actuator assembly 240 can be connected to a hydraulic supply passage, such as at least Figure 6B and Fig. 7A , and is supplied by the engine hydraulic supply passage 262 depicted in . In a particular embodiment, the engine hydraulic supply passage 262 can be connected to the controlled hydraulic fluid pipeline 330.

[0095] In certain embodiments, such as Fig. 6A As shown by way of non-limiting example in FIG. 1 , one or more oil control valves 320 (OCV) of an exemplary hydraulic supply system 300 of an engine may be configured to receive a pressurized hydraulic fluid line 310 and controllably connect (by opening) or disconnect (by closing) a pressurized supply from the pressurized hydraulic fluid line 310 to a controlled hydraulic fluid line 330. Thus, in certain embodiments, a hydraulic embodiment of an actuator assembly 240 may be energized or turned on by appropriately supplying pressurized hydraulic fluid to the actuator assembly 240 using one or more oil control valves 320, and may be de-energized or turned off by closing the corresponding oil control valves 320 to cut off the pressurized hydraulic fluid supply to the actuator assembly 240.

[0096] By way of example and not limitation, a particular hydraulic implementation of actuator assembly 240 may be energized or turned on to engage engine braking mode and de-energized or turned off to disengage engine braking and change to drive mode.

[0097] In certain embodiments, as in Figure 7B As depicted by way of non-limiting example in FIG. 1 , the actuator assembly 240 (e.g., the lower chamber 244) may be fluidly coupled to the plunger assembly 210, such as via a hydraulic actuation passage 264. By way of example and not limitation, although Figure 4A and Figure 4B Certain features of are not limited to hydraulically actuated operation, but other features depicted therein may be used to illustrate hydraulic operation of the plunger assembly 210 embodiment.

[0098] In certain embodiments, when the plunger assembly 210 is actuated via the hydraulic actuation passage 264 (at Figure 4A When the chamber 230 receives pressurized hydraulic fluid from the energized or opened actuator assembly 240 (as depicted in FIG. 1 ), the chamber 230 is filled with the pressurized fluid. In certain embodiments, the plunger assembly 210 may include one or more hydraulic passages 228, such as in Figure 4B264, to allow pressurized hydraulic fluid to act on the inner surface of plunger pad 220 with an extension force when provided by actuator assembly 240, so that plunger pad 220 can be forced to extend toward the valve interface. In certain embodiments, when the supply of pressurized hydraulic fluid is terminated (such as by de-energizing or shutting off actuator assembly 240), any remaining hydraulic fluid is free to flow and return via hydraulic passage 228 and / or through hydraulic actuation passage 264, allowing plunger pad 220 to freely return to its retracted position. In certain embodiments, contact and / or receipt of force from the valve interface (e.g., swing pin mechanism 155 or sliding pin 150) can be used to accelerate the removal of residual hydraulic fluid in plunger assembly 210 after actuator assembly 240 is de-energized. As discussed elsewhere, in certain embodiments, when the actuator assembly 240 is de-energized or turned off, the plunger assembly 210 may be configured to further direct the plunger pad 220 toward the retracted position and / or restrain or support the plunger pad 220 in the retracted position via a biasing and / or securing mechanism.

[0099] Fig. 8A An actuator assembly is shown in a first state according to certain embodiments. Figure 8B The plunger assembly is shown in a retracted position according to certain embodiments.In certain embodiments, the first state of the actuator assembly 240 can correspond to a de-energized and / or closed state of the actuator assembly 240.

[0100] In certain embodiments, during operation in a de-energized or shutdown state of the actuator assembly 240, the supply of pressurized hydraulic fluid to the actuator assembly 240 is shut off, for example, based on shutting down one or more oil control valves 320 of the engine, thereby shutting off the supply of pressurized hydraulic fluid to the actuator assembly 240 via the hydraulic supply inlet 260. Therefore, in certain embodiments, the control pin 250 is biased by the control pin biasing member 252 to push the check ball 248 away, thereby allowing residual hydraulic fluid to flow freely through the open flow passage 251 of the check valve 246. By way of example and not limitation, since there is no supply of pressurized hydraulic fluid in this state, the two chambers (upper chamber 242 and lower chamber 244) of the actuator assembly 240 may include low pressure and / or residual hydraulic fluid. Therefore, by way of example and not limitation, the plunger pad 220 of the plunger assembly 210 may collapse and / or be unable to resist or apply force to a valve interface (such as a swing pin mechanism 155 or a sliding pin 150).

[0101] Fig. 9A The actuator assembly is shown in a second state according to certain embodiments. Fig. 9BThe plunger assembly is shown in an extended position according to certain embodiments.In certain embodiments, the second state of the actuator assembly 240 can correspond to an energized and / or open state of the actuator assembly 240.

[0102] In certain embodiments, during operation of the actuator assembly 240 in an energized or on state, such as based on opening one or more oil control valves 320 of the engine, a supply of pressurized hydraulic fluid to the actuator assembly 240 may be turned on, thereby connecting the actuator assembly 240 to the supply of pressurized hydraulic fluid via the hydraulic supply inlet 260 and thereby pressurizing the upper chamber 242. Thus, in certain embodiments, based on the pressure of the pressurized hydraulic fluid received in the upper chamber 242, the control pin 250 may be pushed (to the right, in Fig. 8A ) to resist the force of the control pin biasing member 252, thereby disengaging or withdrawing from contact with the check ball 248.

[0103] Thus, in certain embodiments, in this state where the control pin 250 is disengaged relative to the check ball 248, the check ball 248 can now operate in this state to open or close the fluid flow path of the check valve 246 based on the pressure difference between the upper chamber 242 and the lower chamber 244. Thus, in certain embodiments, the lower chamber 244 can receive pressurized hydraulic fluid to be supplied to the plunger assembly 210 via the hydraulic actuation passage 264, wherein the pressurized hydraulic fluid can be used to extend the plunger pad 220, as previously described herein. In certain embodiments, when the plunger pad 220 receives a force from the valve interface (such as the swing pin mechanism 155 or the sliding pin 150), the further increase in the hydraulic fluid pressure in the lower chamber 244 based on the received force can be used to move the check ball 248 and keep the check ball against the flow path of the check valve 246 closed, thereby sealing the lower chamber 244 and allowing the plunger pad 220 to remain rigidly extended to resist and apply forces relative to the valve interface.

[0104] other

[0105] The above description of these embodiments has been provided for the purpose of illustration and description. It is not intended to be exhaustive or to limit the present disclosure. The individual elements or characteristic structures of a particular embodiment are generally not limited to that particular embodiment, but are interchangeable and can be used in selected embodiments where applicable, even if not specifically shown or described. It can also be changed in many ways. Such variants should not be considered to be out of the present disclosure, and all such modifications are intended to be included within the scope of the present disclosure.

[0106] Although the present invention has been shown and described in detail in the accompanying drawings and the foregoing description, such illustration and description are considered to be illustrative or exemplary rather than restrictive. It should be understood that those of ordinary skill in the art can make changes and modifications within the scope of the appended claims. In particular, the present invention encompasses other embodiments with any combination of features from the different embodiments described above and below. In addition, the statements characterizing the present invention made herein refer to an embodiment of the present invention, not necessarily all embodiments.

[0107] The terms used in the claims should be interpreted as having the broadest reasonable interpretation consistent with the foregoing description. For example, the use of the article "one" or "the" when introducing an element should not be interpreted as excluding multiple elements. Similarly, the expression of "or" should be interpreted as inclusive, so that the expression of "A or B" does not exclude "A and B", unless it is clear from the context or the foregoing description that only one of A and B is intended. In addition, the expression "at least one of A, B and C" should be interpreted as one or more of a group of elements consisting of A, B and C, and should not be interpreted as requiring at least one of each of the listed elements A, B and C, regardless of whether A, B and C are related as categories or otherwise. In addition, the expression of "A, B and / or C" or "at least one of A, B or C" should be interpreted as including any single entity from the listed elements (e.g., A), any subset from the listed elements (e.g., A and B), or the entire list of elements A, B and C.

[0108] Numerical ranges recited in this application should be interpreted as including the endpoints of the ranges. Specific axes, such as one or more transverse and / or longitudinal axes, which may be omitted in some of the illustrations herein, should be interpreted as being present in each illustration or instance where relevant or mentioned.

Claims

1. A rocker arm assembly, the rocker arm assembly being rotatable about a rocker arm shaft and characterized in that include: a first portion configured to receive a valve lift profile; and a second portion configured to operably engage one or more valves based on the valve lift profile, the second portion comprising: an actuator assembly switchable between a first state and a second state, the actuator assembly including a valve train actuated by a control member; and A plunger assembly, the plunger assembly comprising: an elongated member having a first end and a second end opposite the first end; a plunger pad slidably disposed at the first end of the elongated member; and a gap adjustment mechanism associated with the second end of the elongated member, wherein the longitudinal axis of the actuator assembly is angled with the plunger axis of the plunger assembly, wherein the control member of the actuator assembly is hydraulically actuated to act on the valve train, and Wherein upon actuation of the actuator assembly, the plunger pad is selectively retractable relative to the elongated member along the plunger axis between a retracted position and an extended position.

2. The rocker arm assembly according to claim 1, characterized in that: The plunger assembly also includes: a collar secured to the plunger pad; and A plunger biasing member is disposed between the first end of the elongated member and the collar, wherein the plunger biasing member is configured to bias the plunger pad toward the retracted position.

3. The rocker arm assembly according to claim 2, characterized in that: Corresponding to the second state of the actuator assembly, a hydraulically-based extension force is used to overcome a force associated with the plunger biasing member such that the plunger pad extends to the extended position.

4. The rocker arm assembly according to claim 2, characterized in that: The plunger biasing member includes a spring.

5. The rocker arm assembly according to claim 1, characterized in that: The inner surface of the plunger pad includes a stopper, and the elongated member of the plunger assembly further includes a locking assembly disposed proximally of the first end and configured to engage the stopper.

6. The rocker arm assembly according to claim 5, characterized in that: Corresponding to the second state of the actuator assembly, a hydraulically-based extension force is used to overcome a detent force associated with engagement of the locking assembly with the detent such that the plunger pad is extended to the extended position.

7. The rocker arm assembly according to claim 5, characterized in that: The detent includes a recess, and the locking assembly includes a protruding feature and a locking biasing member configured to bias the protruding feature toward the recess.

8. The rocker arm assembly according to claim 7, characterized in that: The lock biasing member is disposed along a lock axis that is angled with respect to the plunger axis.

9. The rocker arm assembly according to claim 1, characterized in that: The clearance adjustment mechanism is accessible through an upper surface of the rocker arm assembly to facilitate clearance adjustment of the plunger assembly.

10. The rocker arm assembly according to claim 9, characterized in that: The clearance adjustment mechanism extends above the upper surface of the rocker arm assembly.

11. The rocker arm assembly according to claim 1, characterized in that: The longitudinal axis of the actuator assembly is oriented perpendicular to the plunger axis.

12. The rocker arm assembly according to claim 1, characterized in that The second portion also includes a lost motion assembly configured to absorb at least a portion of the valve lift profile.

13. The rocker arm assembly according to claim 12, characterized in that: The idle running assembly comprises: an idler shaft movable within a bore disposed along a longitudinal axis of the idler assembly; and A lost motion biasing member is configured to bias the lost motion shaft toward the one or more valves.

14. The rocker arm assembly according to claim 13, characterized in that: The longitudinal axis of the lost motion assembly is disposed parallel to the plunger axis of the plunger assembly.

15. The rocker arm assembly according to claim 1, characterized in that The first portion of the rocker arm assembly includes a roller configured to engage a cam to receive at least a portion of the valve lift profile.

16. The rocker arm assembly according to claim 1, characterized in that Corresponding to the first state of the actuator assembly, the valve train is held open by the control member such that the plunger pad is retracted to the retracted position.

17. The rocker arm assembly according to claim 1, characterized in that The valve train includes a check valve that is biased against a hydraulic passage opening by a check valve biasing member.

18. The rocker arm assembly according to claim 17, characterized in that The control member includes a control pin biased against the check valve by a control biasing member, the control member being movable along the longitudinal axis of the actuator assembly.

19. A valve mechanism system, characterized in that include: A cam, wherein the cam is provided with a valve lift profile; one or more valves; Rocker arm shaft; and A rocker arm assembly, wherein the rocker arm assembly is rotatable around the rocker arm shaft, and the rocker arm assembly comprises: a first portion configured to receive the valve lift profile; and a second portion configured to operably engage one or more of the valves based on the valve lift profile, the second portion comprising: an actuator assembly switchable between a first state and a second state, the actuator assembly including a valve train actuated by a control member; and A plunger assembly, the plunger assembly comprising: an elongated member having a first end and a second end opposite the first end; a plunger pad slidably disposed at the first end of the elongated member; and a gap adjustment mechanism associated with the second end of the elongated member, wherein the longitudinal axis of the actuator assembly is angled with the plunger axis of the plunger assembly, wherein the control member of the actuator assembly is hydraulically actuated to act on the valve train, and Wherein upon actuation of the actuator assembly, the plunger pad is selectively retractable relative to the elongated member along the plunger axis between a retracted position and an extended position.

Images