DE112017001251T5 - rocker - Google Patents

Abstract

A valvetrain assembly includes a first exhaust valve, a second exhaust valve, and a valve bridge having a main body and a lever rotatably coupled to the main body, wherein the main body is configured to engage the first exhaust valve and the lever is configured to engage in the first exhaust valve second outlet valve intervene. An exhaust valve rocker arm assembly is configured to selectively open the first and second exhaust valves, the exhaust valve rocker arm assembly including an exhaust valve rocker arm having a hydraulic lash adjuster assembly (HLA) coupled thereto, the HLA assembly being in contact with the valve bridge backbone. An engine brake rocker assembly is configured to selectively open the second exhaust valve and includes an engine brake rocker arm having a combined HLA and an additional motion capsule coupled thereto. The combined HLA and additional motion capsule is configured to selectively engage and rotate the lever.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of the filed on April 7, 2016 Indian Patent Application No. 201611012287 who submitted on April 28, 2016 Indian Patent Application No. 201611014772 and the provisional filed on 5 December 2016 U.S. Patent Application No. 62 / 430,102 , The details of the above applications are incorporated herein by reference.

FIELD

The present disclosure generally relates to a rocker arm assembly for use in a valvetrain assembly, and more particularly to a rocker arm assembly having an engine brake bridge.

BACKGROUND

Compression engine brakes can be used as additional brakes in addition to the wheel brakes, such as in relatively large vehicles driven by heavy or medium diesel engines. A compression engine brake system, when activated, is arranged to provide additional opening of the exhaust valve of an engine cylinder when the piston in that cylinder is near a top dead center position of its compression stroke so that compressed air can be exhausted through the exhaust valve. As a result, the engine acts as a power-consuming air compressor that slows down the vehicle.

In a typical valvetrain assembly used with a compression engine brake, the exhaust valve is actuated by a rocker arm which engages the exhaust valve via a valve bridge. The rocker arm is actuated in response to a cam on a rotating camshaft and presses on the valve bridge, which in turn presses on the exhaust valve to open it. Hydraulic backlash may also be provided in the valvetrain assembly to remove any play or gap that develops between the components in the valvetrain assembly.

The background description contained herein is intended to broadly illustrate the context of the disclosure. Works of the present inventors, insofar as they are described in this Background section, as well as aspects of the description which can not be considered as prior art at the time of the application, are neither expressly accepted nor implied as prior art against the present disclosure.

SUMMARY

In one aspect of the present disclosure, a valve train assembly is provided. The valvetrain assembly includes a first exhaust valve, a second exhaust valve and a valve bridge having a main body and a lever rotatably coupled to the main body, the main body configured to engage the first exhaust valve, and the lever configured to engage in the first exhaust valve second outlet valve intervene. An exhaust valve rocker arm assembly is configured to selectively open the first and second exhaust valves, the exhaust valve rocker arm assembly including an exhaust valve rocker arm having a hydraulic lash adjuster assembly (HLA) coupled thereto, the HLA assembly being in contact with the valve bridge backbone. An engine brake rocker assembly is configured to selectively open the second exhaust valve and includes an engine brake rocker arm having a combined HLA and an additional motion capsule coupled thereto. The combined HLA and additional motion capsule is configured to selectively engage and rotate the lever to open the second exhaust valve.

In addition, the valvetrain assembly may include one or more of the following features, wherein the HLA assembly is in continuous contact with the valve bridge main body; wherein the combined HLA and the added motion capsule includes a second HLA assembly and an additional movement assembly, wherein the additional movement assembly is configured to move between a retracted position in which the combined HLA and the added motion capsule does not touch the lever, and an extended position in which the combined HLA and the added agitation capsule contacts the lever to move and is configured to rotate the lever to open the second exhaust valve; wherein the combined HLA and the added motion capsule is coupled to the lever; wherein the opening of the second exhaust valve performs a brake event operation; and wherein the lever is coupled to the main body such that rotation of the lever and engagement of the second exhaust valve occur without rotation of the main body.

In another aspect of the present disclosure, a valvetrain assembly is provided. The valvetrain assembly includes a first exhaust valve, a second exhaust valve, and a valve bridge having a main body and a lever rotatably coupled to the main body, wherein the main body is configured to engage the first exhaust valve and the lever is configured to engage the second exhaust valve. An exhaust valve rocker arm assembly is configured to selectively open the first and second exhaust valves, the exhaust valve rocker arm assembly including an exhaust valve rocker arm having a rigid motion transfer assembly coupled thereto, the rigid motion transfer assembly being in contact with the valve bridge backbone. An engine brake rocker assembly is configured to selectively open the second exhaust valve and includes an engine brake rocker arm having a combined HLA and an associated additional motion capsule, the combined HLA and the additional motion capsule being configured to selectively engage the lever and to turn to open the second exhaust valve.

In addition, the valvetrain assembly may include one or more of the following features: wherein the rigid motion transfer assembly is in constant contact with the valve bridge main body; the rigid motion transfer assembly comprising a rigid body connected to a pin disposed within a sleeve, the sleeve contacting the valve bridge main body; wherein the rigid motion transfer assembly does not include a hydraulic lash adjuster function; wherein the combined HLA and added agitation capsule includes a second HLA assembly and an additional movement assembly, wherein the additional agitation assembly is configured to intervene between a retracted position in which the combined HLA and the added agitation capsule does not contact the lever; extended position in which the combined HLA and the added movement capsule touches the lever to move and is configured to rotate the lever for opening the second exhaust valve; wherein the combined HLA and the added motion capsule are coupled directly to the lever; and wherein the main body includes an opening, wherein the lever is at least partially disposed within the opening, and wherein the lever is rotatably coupled to the main body by a bridge pin extending through the main body.

In another aspect of the present disclosure, a valvetrain assembly is provided. A valvetrain assembly having a first exhaust valve, a second exhaust valve, and a valve bridge having a main body and a lever rotatably coupled to the main body, the main body configured to engage the first exhaust valve, and the lever configured to enter the second exhaust valve Exhaust valve intervene. An exhaust valve rocker arm assembly is configured to selectively open the first and second exhaust valves, the exhaust valve rocker arm assembly including an exhaust valve rocker arm having a hydraulic lash adjuster assembly (HLA) coupled thereto, the HLA assembly being in contact with the valve bridge backbone. An engine brake rocker arm assembly is configured to selectively open the second exhaust valve and includes an engine brake rocker arm having a deadman's pod coupled thereto, the deadlift pod configured to selectively engage and rotate the lever to engage the second exhaust valve to open.

In addition, the valvetrain assembly may include one or more of the following features: wherein the HLA assembly is in constant contact with the valve bridge main body; wherein the idle capsule does not include a hydraulic clearance adjustment; wherein the idle capsule is configured to move between an activated position and a deactivated position, wherein the idle capsule in the activated position acts as a rigid body configured to transmit the movement from the engine brake rocker arm to the lever, thereby Turn lever and open the second exhaust valve, and wherein the idle capsule is configured in the deactivated position to collapse when the idle capsule touches the lever to accommodate the movement of the Motorbremskipparms; wherein the lost motion capsule comprises an outer body, a piston, a locking mechanism and a ball stud; wherein the lost motion capsule is directly coupled to the lever; wherein the HLA assembly comprises an outer housing, a first piston body and a second piston body, wherein the first piston body and the second piston body are at least partially disposed within the outer housing and define a central chamber therebetween configured to receive a fluid, and wherein the hydraulic actuator assembly further comprises a biasing mechanism disposed between the first piston body and the second piston body; and wherein the lever includes an engagement surface, an engagement surface opposite side, and a stop flange extending therefrom, wherein the engagement surface is configured to be selectively engaged by the dead motion capsule, the opposite side configured to project upwardly against the main body to move when the engagement surface is moved down, and wherein the stop flange is configured to selectively engage an edge of the main body, which at least partially defines the opening to limit the downward movement of the lever.

list of figures

• 1 ist eine Draufsicht einer Ventiltriebanordnung mit einer Kipphebelanordnung, die eine Einlass-Kipphebelanordnung, eine Auslass-Kipphebelanordnung und eine Motorbrems-Kipphebelanordnung beinhaltet, die nach einem Beispiel der vorliegenden Offenbarung konstruiert wurde;
• 2 ist eine perspektivische Ansicht der in 1 dargestellten Ventiltriebanordnung ohne die Einlass-Kipphebelanordnung;
• 3 ist eine Explosionszeichnung der Auslassventil-Kipphebelanordnung und der Motorbrems-Kipphebelanordnung von 1;
• 4 ist eine Querschnittsansicht der in 3 dargestellten Motorbrems-Kipphebelanordnung, die entlang der Linie 4-4 aufgenommen wurde;
• 5 ist eine perspektivische Ansicht eines Teils der in 1 dargestellten Kipphebelanordnung;
• 6 ist eine perspektivische Ansicht einer Ventilbrückenanordnung der in 1 dargestellten Auslassventilbrücke, die nach einem Beispiel der vorliegenden Offenbarung konstruiert wurde;
• 7 ist eine Draufsicht auf einen Teil der in 6 dargestellten Ventilbrückenanordnung;
• 8 ist eine Querschnittsansicht der in 5 dargestellten Kipphebelanordnung, die entlang der Linie 8-8 und während einer normalen Auslassereignisbetätigung aufgenommen wurde;
• 9 ist eine Querschnittsansicht der in 5 dargestellten Kipphebelanordnung, die entlang der Linie 8-8 und während einer Bremsereignisbetätigung aufgenommen wurde;
• 10 ist eine perspektivische Ansicht einer anderen Konfiguration der in 2 dargestellten Kipphebelanordnung;
• 11 ist eine perspektivische Ansicht einer weiteren Konfiguration der in 2 dargestellten Kipphebelanordnung; und
• 12 ist eine Querschnittsansicht einer weiteren Konfiguration der in 2 dargestellten Kipphebelanordnung.

The present disclosure will be better understood from the detailed description and the accompanying drawings, wherein:

• 1 FIG. 10 is a top view of a valve train assembly including a rocker arm assembly including an intake rocker arm assembly, an exhaust rocker arm assembly and an engine brake rocker arm assembly constructed in accordance with an example of the present disclosure; FIG.
• 2 is a perspective view of the in 1 shown valve train assembly without the inlet rocker arm assembly;
• 3 FIG. 4 is an exploded view of the exhaust valve rocker arm assembly and the engine brake rocker arm assembly of FIG 1 ;
• 4 is a cross-sectional view of the in 3 illustrated engine brake rocker arm assembly taken along line 4-4;
• 5 is a perspective view of a portion of in 1 illustrated rocker arm assembly;
• 6 FIG. 15 is a perspective view of a valve bridge assembly of FIG 1 illustrated exhaust valve bridge constructed according to an example of the present disclosure;
• 7 is a top view of a part of in 6 illustrated valve bridge assembly;
• 8th is a cross-sectional view of the in 5 illustrated rocker arm assembly taken along line 8-8 and during a normal exhaust event operation;
• 9 is a cross-sectional view of the in 5 illustrated rocker arm assembly taken along the line 8-8 and during a brake event operation;
• 10 is a perspective view of another configuration of the in 2 illustrated rocker arm assembly;
• 11 is a perspective view of another configuration of the in 2 illustrated rocker arm assembly; and
• 12 is a cross-sectional view of another configuration of the in 2 illustrated rocker arm assembly.

DETAILED DESCRIPTION

With initial reference to the 1 and 2 A partial valve assembly constructed in accordance with an example of the present disclosure is illustrated and referenced 10 generally identified. The part valve arrangement 10 uses the engine brake and is configured for use in a three-cylinder section of a six-cylinder engine. However, it is estimated that current teachings are not so limited. In this regard, the present disclosure may be used in any valve train assembly that uses the engine brake. The part valve arrangement 10 is in a valve train carrier 12 stored and may include three rocker arms per cylinder.

In particular, each cylinder includes an intake valve rocker arm assembly 14 , an exhaust valve rocker arm assembly 16 and an engine brake rocker arm assembly 18 , The rocker arm assembly 16 the exhaust valve and the rocker arm assembly 18 The engine brakes work together to control the opening of the exhaust valves and together act as a double rocker arm assembly 20 designated ( 2 ). The intake valve rocker arm assembly 14 is configured to control the movement of the intake valves, the exhaust valve rocker arm assembly 16 is configured to control the exhaust valve movement in a drive mode and the engine brake rocker assembly 18 is configured to act on one of the two exhaust valves in an engine braking mode, as described herein. In alternative configurations, the exhaust valve rocker arm assembly 16 and the engine brake rocker arm assembly 18 be combined into a single rocker arm, referred to as the combined exhaust and engine brake rocker arm assembly.

A rocker arm shaft 22 is from the valvetrain carrier 12 accommodates and assists in the rotation of the exhaust valve rocker assembly 16 and the engine brake rocker arm assembly 18 , As described in more detail herein, the rocker arm shaft 22 during operation oil to the arrangements 16 . 18 hand off. A camshaft 24 includes lift profiles or cams that are configured to the arrangements 16 . 18 to turn to first and second exhaust valves 26 and 28 to activate, as described in more detail herein.

As in 2 shown, includes the exhaust valve rocker arm assembly 16 a component C1 that of a valve bridge assembly 32 is operatively associated, and the engine brake rocker assembly 18 includes a component C2 that a movable lever assembly 130 is operatively associated, located in the valve bridge assembly 32 located. The components C1 and C2 are configured to control the movement (sometimes selectively) between their associated rocker arm assembly 16 . 18 and the respective valve bridge arrangement 32 and the movable lever assembly 130 transferred to.

As further described herein, various configurations and / or combinations of components may be used C1 and C2 enable various engine control techniques. A first configuration in the 3-5 For example, FIG C1 as hydraulic lash adjuster (HLA) 36 and C2 as an actuator or piston assembly 76 without HLA functions. A second configuration, in 10 is illustrated C1 as an HLA arrangement 208 and C2 as a combined HLA and additional movement capsule 210 , A third configuration, in 11 is illustrated C1 as a rigid motion transfer device 310 without HLA functions and C2 as a combined HLA and additional movement capsule 312 , A fourth configuration, in 12 is illustrated C1 as an HLA arrangement 410 and C2 as an idle capsule 412 without HLA functions.

Such engine control techniques that may be performed with the various configurations mentioned above include, but are not limited to: variable valve lift (VVL), early valve opening (EIVO), early valve closure (EIVC), late valve opening (LIVO), late valve closure (LIVC ), early valve opening (EEVO), early exhaust valve closing (EEVC), late exhaust valve opening (LEVO), late exhaust valve closing (LEVC), a combination of EEVC and LIVO, negative valve overlap (NVO) or other engine control techniques.

With further reference to the 2 and 3 becomes the rocker arm assembly 16 the exhaust valve further described. The exhaust valve rocker arm assembly 16 In general, an outlet skip can 30 , a valve bridge assembly 32 and a hydraulic clearance adjustment device (HLA) 36 include.

The exhaust rocker arm 30 includes a body 40 , an axis 42 and a role 44 , The body 40 can the rocker arm shaft 22 pick up and define a hole 48 that is configured to the HLA arrangement 36 at least partially. The axis 42 can with the body 40 be coupled and the role 44 that is configured to be from an outlet lift profile or cam 50 ( 2 ) of the camshaft 24 is engaged. If the role 44 through the exhaust lift profile 50 is engaged, the Auslaßkipphebel 30 turned down, causing a downward movement of the valve bridge assembly 32 leading into the first and second exhaust valves 26 and 28 ( 2 ) which are associated with a cylinder of an engine (not shown).

The HLA arrangement 36 is configured to handle any play between the HLA arrangement 36 and the valve bridge assembly 32 take. With additional reference to the 8th and 9 can the HLA arrangement 36 In an exemplary implementation, a piston assembly 52 with a leaky piston or first piston body 54 and a ball piston or second piston body 56 include. The piston assembly 52 gets through in the rocker arm 30 defined hole 48 taken and may have a first closed end, which is a nozzle 58 defined in a socket 60 is received, which against the valve bridge assembly 32 acts. The second piston body 56 has an opening which has a valve seat 62 defined, and a check ball arrangement 64 can between the first and second piston body 54 . 56 be positioned.

The check ball arrangement 64 Can be configured to store oil in a chamber 66 between the first and second piston bodies 54 . 56 to keep. A pretensioning mechanism 68 (For example, a spring) biases the second piston body 56 upwards (as in the 8th and 9 shown) to the first piston body 54 expand and accommodate any latitude. Since the second piston body 56 biased upward, the oil is through the check ball assembly 64 in the chamber 66 between the piston bodies 54 . 56 drawn. Accordingly, oil from the rocker arm shaft 22 through a channel (not shown) into the chamber within the second piston 56 can be fed, and downward pressure can be due to the oil in the chamber 66 a downward movement of the first piston body 54 cause. The HLA arrangement 36 however, it may have any other suitable configuration, that of the arrangement 36 allows play between the assembly and the valve bridge assembly 32 take.

With further reference to the 2-4 becomes the rocker arm assembly 18 the engine brake described in more detail. The engine brake rocker arm assembly 18 Generally can have an engine brake rocker arm 70 , an axis 72 , a role 74 , an actuator or a piston assembly 76 and a check valve arrangement 78 include.

The toggle lever of the engine brake 70 can the tilting shaft 22 record and a first hole 80 and a second hole 82 define. The first hole 80 Can be configured to the piston assembly 76 at least partially, and the second bore 82 Can be configured to the check valve arrangement 78 at least partially. The axis 72 can with the rocker arm 70 be coupled and the role 74 which is configured to from a Bremshubprofil or cam 84 ( 2 ) of the camshaft 24 to be engaged. If the role 74 from the camshaft 84 is locked, the braking rocker 70 turned down, causing a downward movement of the piston assembly 76 leads.

As in the 3 and 4 shown, the actuator or piston assembly 76 a first actuator or piston body 86 , a second actuator or piston body 88 , a socket 90 , a biasing mechanism 92 , a stopper 94 and a mother 96 include. The piston assembly 76 can through the first hole 80 of the rocker arm 70 be recorded. The first piston body 86 may include a first closed end that has a neck 98 defined in the socket 90 is received, which against the valve bridge assembly 32 acts. The second piston body 88 can with the mother 96 on the rocker arm 70 and the stop 94 on the second piston body 88 be attached. The second piston body 88 and the mother 96 can serve as a fine adjustment screw to the initial position of the piston assembly 76 adjust.

The biasing mechanism 92 (For example, a spring) is configured to the first piston body 86 up into the hole 80 to pull or retract to a retracted position. The stop 94 can be configured to control the upward movement of the first piston body 86 to limit. Pressure oil is selectively channeled 100 ( 4 ) of a chamber 102 of the first piston body 86 fed to the piston body 86 from the hole 80 to move in an extended position down and out. When the oil supply to the channel 100 is interrupted, the first piston body returns 86 through the biasing mechanism 92 back to the retracted position.

The check valve arrangement 78 is at least partially in the second hole 82 arranged and can be a slider or check valve 110 , a biasing mechanism 112 , a lid 114 and a clip 116 include. The check valve arrangement 78 is configured to selectively remove oil from one channel 118 ( 4 ) in the rocker arm shaft 22 to the canal 100 to promote. The check valve 110 can by the biasing mechanism 112 be biased into a closed position, leaving the channel 100 no oil is supplied. When the oil pressure in the duct 118 sufficient to the check valve 110 To open, the oil gets over the channel 100 fed to the piston assembly 76 to bring in the extended position. The clip 116 can be in one in the second hole 82 provided radial groove are used to the check valve assembly 78 to hold in it.

Many known engines with hydraulic lash adjuster have a single rocker arm that operates two valves via a valve bridge via these valves. The engine brake bypasses the bridge and pushes on one of the valves that biases or angles the valve bridge to open a single valve and blow down the cylinder. However, due to the tensioned valve bridge, the HLA can respond by lengthening and accommodating the resulting play. This may be undesirable because the extended HLA arrangement after braking can keep the exhaust valves open with some pressure loss and possibly piston-to-valve contact.

To overcome this potentially unwanted event, the arrangement includes 10 a valve bridge assembly 32 with a movable lever assembly integrated therein 130 , The lever arrangement 130 may be part of the valve actuation force to the HLA assembly 36 (over bridge 32 ) and thus prevent inadvertent extension of the HLA assembly during braking. Thus, the lever arrangement allows 130 the opening of the valve 26 during the engine braking operation, without the downward movement of the valve bridge assembly 32 to enable. It also reduces the lever arrangement 130 the required for the braking event operating force compared to known systems clearly.

With additional reference to the 6 and 7 includes the valve bridge assembly 32 in an exemplary implementation, within a main bridge main body 132 arranged lever arrangement 130 , The bridge body 132 includes a first end 134 and a second end 136 , The first end 134 Can be configured to enter the valve 28 to intervene, and the second end 136 can be a first opening 138 , a second opening 140 and a third opening 142 include.

As in 5 shown, the lever assembly 130 generally a lever 150 , a bridge bolt 152 , a valve shoe 154 and a valve shoe bolt 156 include. The lever 150 can be within the first opening 138 can be arranged and is over the bridge bolt 152 passing through the second and third opening 140 . 142 of the bridge main body 132 extends, rotatably with the bridge main body 132 coupled.

The lever 150 includes an engagement surface 158 , first opposite openings 160 , second opposite openings 162 and a stop flange 164 , The engagement surface 158 is configured to be selective over the socket 90 the piston assembly 76 to get in touch. First opposite openings 160 can the bridge pin 152 record, and the second opposing openings 162 can the valve shoe bolt 156 take up. The stop flange 164 Can be configured to be in a pole 166 ( 6 and 7 ) of the bridge main line 132 to intervene the downward movement of the lever 150 to limit (as in 6 shown).

The valve shoe 154 includes a main body portion 168 and a connection section 170 with an opening formed therein 172 , The main body section 168 is configured to a section of the valve 26 and the connection section 170 is at least partially within the lever 150 arranged so that the connecting portion opening 172 the valve shoe pin 156 absorbs the valve shoe 154 rotatable with the lever 150 connect to.

Accordingly, the lever 150 selectively on the engagement surface 158 be engaged, causing a rotation around pin 156 and an upward movement of an opposite side 174 of the lever facing the surface 158 lies, can cause (see 9 ). This upward movement of the lever end 174 causes upward movement of the bridge main body 132 towards the HLA arrangement 36 to prevent an extension.

Thus, the exhaust rocker arm 16 during operation of the rocker arm assembly 20 selectively in the valve bridge main body 132 intervene to the valves 26 . 28 to operate and perform a normal exhaust event (combustion mode); during the engine brake rocker arm 18 selectively in the lever arrangement 130 can engage only to the valve 26 to operate and perform a brake event operation (engine braking mode).

The piston assembly 76 is configured to the first piston body 86 between the retracted position and the extended position to move. In the retracted position, the first piston body 86 into the hole 80 withdrawn, leaving the socket 90 from the lever engagement surface 158 is spaced and this does not touch, even if the camshaft 84 the camshaft 24 in the rocker arm 70 engages the engine brake.

In the extended position, the first piston body extends 86 however, out of the hole 80 so that the socket 90 positioned to fit into the lever engagement surface 158 intervenes. If the cam 84 the camshaft 24 in the rocker arm 70 the engine brake engages, turns the bushing 90 the lever around pen 156 to the valve 26 engage and perform the operation of the braking event. 4 shows the rocker arm assembly 18 the engine brake with the piston assembly 76 in the extended position, as oil from the rocker arm shaft 22 over the canal 100 is supplied. In this position, the actuation of the engine brake event is active, and the piston assembly 76 is configured to be in the lever assembly 130 the valve bridge assembly 32 intervene ( 9 ). The ability to actuate the engine braking event may be disabled by adjusting the oil supply through the channels 100 and or 118 is interrupted, causing the piston assembly 76 moved to the retracted position.

With reference to the 4 . 8th and 9 Now, an exemplary operation of the exhaust valve rocker arm assembly will be described 16 and the engine brake rocker arm assembly 18 described.

8th shows sections of the arrangements 16 . 18 during a normal exhaust event operation where the exhaust rocker arm 30 from the cam 50 the camshaft 24 is engaged. Especially when turning the camshaft 24 engages the camshaft 50 in the role 44 a, which causes the exhaust rocker arm 30 around the camshaft 22 rotates. In this movement, the exhaust rocker pushes 30 through the HLA arrangement 36 and moves the valve bridge main body 132 down to the first and second exhaust valves 26 . 28 to open.

9 illustrates parts of the arrangements 16 . 18 during a brake event operation, wherein the engine brake rocker arm 70 with the cam 84 the camshaft 24 engaged. Especially when turning the camshaft 24 engages the camshaft 84 in the role 74 a, whereby the brake rocker arm 70 around the rocker shaft 22 rotates. When the first piston body 86 is in the extended position, presses the brake rocker arm 70 the socket 90 down to the lever engagement surface 158 engage and cause a downward movement. This in turn can lead to a downward movement of the valve shoe 154 Lead the valve 26 opens to brake the engine. When the lever 150 around pen 156 is tilted, the lever end moves 174 up against the bridge body 132 that against the HLA arrangement 36 presses to prevent their extension during braking.

10 illustrates a valve train assembly 200 , which was constructed according to an example of the present disclosure. The valve train arrangement 200 may be similar to the valve train assembly 10 , as in 2 shown, with the exception that the component C1 an HLA arrangement 208 is and the component C2 a combined HLA and an additional movement capsule 210 is. The HLA arrangement 208 may be similar to the HLA arrangement described above 36 by including hydraulic fluid to adjust the gap height and configured to match any clearance between the HLA assembly 208 and the valve bridge assembly 32 automatically record. In addition, the HLA arrangement 208 Although not shown, components include those of the HLA arrangement 36 are similar. The HLA arrangement 208 however, it is not limited thereto and may include any suitable structure that it is the arrangement 208 allows to function as described herein.

The combined capsule 210 can be an HLA arrangement 212 and an additional movement arrangement 214 include. The HLA arrangement 212 may be similar to the HLA arrangement described above 36 by including hydraulic fluid for adjusting the gap height and being configured to allow any clearance between the capsule 210 and the valve bridge assembly 32 automatically record. In addition, the HLA arrangement 212 Although not shown, components include those of the HLA arrangement 36 are similar. The HLA arrangement 212 however, it is not limited thereto and may include any suitable structure that it is the arrangement 212 allows to function as described herein.

In the exemplary embodiment, the added movement assembly is 214 the piston assembly described above 76 similarly, adding the added motion assembly 214 is configured to move between a retracted position and the extended position. In this way, there is the additional movement arrangement 214 standard in the retracted position, where it can be withdrawn, leaving a socket 290 at a distance from the lever engagement surface 158 is arranged and this does not touch, even if the cam cam 84 the camshaft 24 in the rocker arm 70 engages the engine brake. If the jack 290 However, when selectively activated in the extended position, it is positioned to fit into the lever engagement surface 158 intervenes. If the cam 84 the camshaft 24 in the rocker arm 70 the engine brake engages, turns the bushing 290 the lever 150 around pen 156 to the valve 26 engage and perform the operation of the braking event. Thus, this configuration provides the valvetrain assembly 200 an HLA control on the bridge housing 132 via the HLA arrangement 208 the exhaust valve rocker arm assembly 16 and a combined HLA and additional motion control on the lever 150 via the combined HLA and additional movement capsule 210 , In other configurations, the socket 290 or another portion of the additional movement assembly 214 with the lever 150 be coupled to prevent relative movement therebetween, for example via a clip, a press fit in the lever 150 or other suitable means for the contact between the additional movement arrangement 214 and the lever 150 maintain. Thus, the withdrawal of the arrangement 214 the lever 150 from the valve 26 lift away to prevent contact between them.

11 illustrates a valve train assembly 300 , which was constructed according to an example of the present disclosure. The valve train arrangement 300 may be similar to the valve train assembly 10 , as in 2 with the exception that the component C1 is a rigid movement capsule or an assembly 310 and component C2 is a combined HLA and an additional motion capsule 312 is.

The rigid motion transfer device 310 is at least partially within the outlet rocker arm 30 arranged and contains a body 314 that with a tang 316 connected within a socket 318 is arranged. In the exemplary embodiment, the rigid motion transfer assembly includes 310 no hydraulic lash adjuster function and transmits the movement from the exhaust rocker arm to the bridge main body 132 to the valves 26 . 28 to press.

In the exemplary embodiment, the combined HLA and the added motion capsule 312 an HLA arrangement 318 and an additional movement arrangement 320 include. The HLA arrangement 318 may be similar to the HLA arrangement described above 36 by including hydraulic fluid for adjusting the gap height and being configured to allow any clearance between the capsule 312 and the valve bridge assembly 32 automatically record. In addition, the HLA arrangement 318 Although not shown, components include those of the HLA arrangement 36 are similar. The HLA arrangement 318 however, it is not limited thereto and may include any suitable structure that it is the arrangement 318 allows to function as described herein.

In the exemplary embodiment, the added movement assembly is 320 the piston assembly described above 76 similarly, adding the added motion assembly 320 is configured to move between a retracted position and the extended position. In this way, there is the additional movement arrangement 320 standard in the retracted position, where it can be withdrawn, leaving a socket 390 at a distance from the lever engagement surface 158 is arranged and this does not touch, even if the cam cam 84 the camshaft 24 in the rocker arm 70 engages the engine brake. If the jack 390 However, when selectively activated in the extended position, it is positioned to fit into the lever engagement surface 158 intervenes. If the cam 84 the camshaft 24 in the rocker arm 70 the engine brake engages, turns the bushing 390 the lever 150 around pen 156 to the valve 26 engage and perform the operation of the braking event. Thus, this configuration allows the Valvetrain arrangement 300 a non-HLA control of the bridge housing 132 via the motion transfer device 310 the exhaust valve rocker arm 16 and a combined HLA and additional motion control of the lever 150 via the combined HLA and additional movement capsule 312 , In other configurations, the socket 390 or another section of the capsule 312 with the lever 150 be coupled to prevent relative movement therebetween, for example via a clip, a press fit in lever 150 or other suitable means to increase the contact between capsule 312 and levers 150 maintain. Therefore, the withdrawal of the combined capsule 312 the lever 150 from the valve 26 lift away to prevent contact between them.

12 illustrates a valve train assembly 400 , which was constructed according to an example of the present disclosure. The valve train arrangement 400 may be similar to the valve train assembly 10 , as in 2 with the exception that the component C1 is an HLA arrangement 410 and component C2 is a lost motion capsule 412 is. The HLA arrangement 410 may be similar to the HLA arrangement described above 36 by including hydraulic fluid to adjust the gap height and configured to match any clearance between the HLA assembly 410 and the valve bridge assembly 32 automatically record. In addition, the HLA arrangement 410 Although not shown, components include those of the HLA arrangement 36 are similar. The HLA arrangement 410 however, it is not limited thereto and may include any suitable structure that it is the arrangement 410 allows to function as described herein.

In an exemplary implementation, the deadlock capsule 412 generally an outer body 420 , a piston 422 , a locking mechanism 424 and a ball stud 426 include. The outer body 420 includes an oil communication groove 428 in fluid communication with a plurality of oil ports 430 over a variety of oil channels 432 , The piston 422 is at least partially within the outer body 420 arranged and configured to be selective within the outer body 420 to slide when the capsule 412 is in an unlocked position (not shown). The ball stud 426 is inside the piston 422 taken up, and the ball stud 426 is configured to handle the lever 150 to be connected. One or more biasing mechanisms 434 (For example, a spring) can between the piston 422 and a cap 436 be arranged to control the movement of the rocker arm 70 to absorb the engine brake when the idle capsule 412 located in the unlocked position, and the cap 436 can be a sliding interface with the rocker arm 70 form. The biasing mechanism 434 Can be configured to the piston 422 from the outer body 420 to bias outwards and the movement of the rocker arm 70 absorb when the deadlock capsule 412 in deactivation mode, providing a dead movement function. However, it should be noted that the idle capsule 412 is not limited to the described structure and may include any suitable structure that allows the idle capsule 412 as described here works.

Thus, the idle capsule acts 412 in an activated or locked position (shown) as a rigid or unitary body and transmits the movement from the rocker arm 70 over the lever 150 on the valve 26 , In contrast, when the capsule 412 is in the deactivated or unlocked position, causes the downward movement of the rocker arm 70 and the upward resistance of the lever 150 that the piston 422 within the outer body 420 slides up. The biasing mechanism 434 then absorbs the downward movement of the rocker arm 70 without this movement on the lever 150 or the valve 26 Thus, this configuration provides the valvetrain assembly 400 an HLA control on the bridge housing 132 via the HLA arrangement 410 and a selective idle control on the lever 150 over the idle capsule 412 , In other configurations, the capsule 412 with the lever 150 be coupled to prevent relative movement therebetween, for example via a clip, a press fit in the lever 150 or other suitable means to increase the contact between capsule 412 and levers 150 maintain.

Described herein are systems and methods for braking an engine. The system includes an exhaust valve rocker arm that engages a valve bridge to actuate two valves and perform an exhaust event. In one aspect, the valve bridge includes a main body and a lever integrated therein, the lever being rotatable with respect to a valve bridge conduit. The rotatable lever may be selectively engaged and rotated by a motor brake rocker arm to actuate one of the two valves to perform an engine braking event. The exhaust valve rocker arm and the engine brake rocker arm include various combinations of components to facilitate hydraulic lash adjustment, additional movement to actuate the braking event, and / or idle motion to actuate the braking event.

The foregoing description of the examples has been presented for purposes of illustration and description. It is not intended to be complete or to limit the revelation. Individual elements or features of a particular example are not generally limited to this particular example, but are optionally interchangeable and may be used in a selected example, even if not expressly illustrated or described. The same thing can be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such changes are intended to be within the scope of the disclosure.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• IN 201611012287 [0001]
• IN 201611014772 [0001]
• US 62430102 [0001]

Claims (23)

What claims: Valve train assembly comprising: a first exhaust valve; a second exhaust valve; a valve bridge having a main body and a lever rotatably coupled to the main body, the main body configured to engage the first exhaust valve, and the lever configured to engage the second exhaust valve; an exhaust valve rocker arm assembly configured to selectively open the first and second exhaust valves, the exhaust valve rocker arm assembly including an exhaust valve rocker arm having a hydraulic lash adjuster assembly (HLA) coupled thereto, the HLA assembly being in contact with the valve bridge backbone ; and an engine brake rocker arm assembly configured to selectively open the second exhaust valve and including an engine brake rocker arm having a combined HLA and an additional motion capsule coupled thereto, wherein the combined HLA and the additional motion capsule are configured to selectively engage the lever to take and turn to open the second exhaust valve. Valve train arrangement according to Claim 1 with the HLA assembly in constant contact with the main bridge housing. Valve train arrangement according to Claim 1 wherein the combined HLA and the added motion capsule include a second HLA assembly and an additional movement assembly, wherein the additional movement assembly is configured to move between a retracted position in which the combined HLA and the added motion capsule do not touch the lever and one extended position in which the combined HLA and the added movement capsule touch the lever to move and is configured to rotate the lever to open the second exhaust valve. Valve train arrangement according to Claim 3 wherein the combined HLA and the additional motion capsule are coupled to the lever. Valve train arrangement according to Claim 3 wherein opening the second exhaust valve causes actuation of the braking event. Valve train arrangement according to Claim 5 wherein the lever is coupled to the main body such that rotation of the lever and engagement of the second exhaust valve occurs without rotation of the main body. Valve train arrangement according to Claim 6 wherein the main body includes an opening, wherein the lever is at least partially disposed within the opening, and wherein the lever is rotatably coupled to the main body by a bridge pin extending through the main body. Valve train assembly comprising: a first exhaust valve; a second exhaust valve; a valve bridge having a main body and a lever rotatably coupled to the main body, the main body configured to engage the first exhaust valve, and the lever configured to engage the second exhaust valve; an exhaust valve rocker arm assembly configured to selectively open the first and second exhaust valves, the exhaust valve rocker arm assembly including an exhaust valve rocker arm having a rigid motion transfer assembly coupled thereto, the rigid motion transfer assembly in contact with the valve bridge backbone; and an engine brake rocker arm assembly configured to selectively open the second exhaust valve and including an engine brake rocker arm having a combined HLA and an additional motion capsule coupled thereto, wherein the combined HLA and the additional motion capsule are configured to selectively engage the lever to take and turn to open the second exhaust valve. Valve train arrangement according to Claim 8 with the rigid motion transfer assembly in constant contact with the main bridge housing. Valve train arrangement according to Claim 8 wherein the rigid motion transfer assembly comprises a rigid body connected to a pin disposed in a receptacle, the receptacle contacting the valve bridge main body. Valve train arrangement according to Claim 8 wherein the rigid motion transfer assembly does not include a hydraulic lash adjuster function. Valve train arrangement according to Claim 8 wherein the combined HLA and the added motion capsule include a second HLA assembly and an additional motion assembly, wherein the additional motion assembly is configured to move between a retracted position in which the combined HLA and the added motion capsule do not contact the lever, and an extended position in which the combined HLA and the added motion capsule touch the lever, and is configured to rotate the lever to open the second exhaust valve. Valve train arrangement according to Claim 12 wherein the combined HLA and the additional motion capsule are coupled directly to the lever. Valve train arrangement according to Claim 8 wherein the main body includes an opening, wherein the lever is at least partially disposed within the opening, and wherein the lever is rotatably coupled to the main body by a bridge pin extending through the main body. Valve train assembly comprising: a first exhaust valve; a second exhaust valve; a valve bridge having a main body and a lever rotatably coupled to the main body, the main body configured to engage the first exhaust valve, and the lever configured to engage the second exhaust valve; an exhaust valve rocker arm assembly configured to selectively open the first and second exhaust valves, the exhaust valve rocker arm assembly including an exhaust valve rocker arm having a hydraulic lash adjuster assembly (HLA) coupled thereto, the HLA assembly being in contact with the valve bridge backbone ; and an engine brake rocker arm assembly configured to selectively open the second exhaust valve and including an engine brake rocker arm having a deadman's pod coupled thereto, the deadlift pod configured to selectively engage and rotate the lever about the second exhaust valve to open. Valve train arrangement according to Claim 15 with the HLA assembly in constant contact with the main bridge housing. Valve train arrangement according to Claim 15 wherein the idle capsule does not include a hydraulic lash adjuster function. Valve train arrangement according to Claim 15 wherein the idle capsule is configured to move between an activated position and a deactivated position; wherein the idle capsule in the activated position acts as a rigid body configured to transmit the movement from the engine brake rocker arm to the lever to thereby rotate the lever and open the second exhaust valve; and wherein in the deactivated position, the dead motion capsule is configured to collapse when the deadman capsule contacts the lever to absorb movement of the engine brake rocker arm. Valve train arrangement according to Claim 18 wherein the idle capsule comprises an outer body, a piston, a locking mechanism and a ball stud. Valve train arrangement according to Claim 19 , wherein the idle capsule is coupled directly to the lever. Valve train arrangement according to Claim 15 wherein the HLA assembly comprises an outer housing, a first piston body and a second piston body, wherein the first piston body and the second piston body are at least partially disposed within the outer housing and defining a central chamber therebetween configured to receive a fluid, and wherein the hydraulic actuator assembly further includes a biasing mechanism disposed between the first piston body and the second piston body. Valve train arrangement according to Claim 15 wherein the lever includes an engagement surface, an engagement surface opposite side, and a stop flange extending therefrom, the engagement surface being configured to be selectively engaged by the idle capsule, the opposite side configured to project upwardly therefrom Main body to move when the engagement surface is moved down, and wherein the stopper flange is configured to selectively engage an edge of the main body which at least partially defines the opening to limit the downward movement of the lever.

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