阅读说明：本技术 中心枢转闩锁停用摇臂 (Center pivot latch deactivation rocker arm ) 是由 马克·范温格登 瑞恩·克里格 于 2019-07-26 设计创作，主要内容包括：本发明提供了一种摇臂,该摇臂可包括凸轮臂、气门臂、空转弹簧和一对可停用闩锁,该对可停用闩锁被构造成阻止该凸轮臂相对于该空转弹簧的行进并且被构造成使得该凸轮臂能够使该空转弹簧塌缩。该凸轮臂可包括凸轮接口、弹簧按压区域、凸轮臂主体和枢转轴连接件。该气门臂可包括气门臂主体、摇臂轴孔、闩锁插座和空转弹簧安装座。枢转轴可将该气门臂主体连接到该凸轮臂主体。另选地,气门臂颈部中的闩锁插座包括闩锁组件,由此可停用闩锁被构造成阻止该凸轮臂的运动并且塌缩,使得该凸轮臂可使该空转弹簧塌缩。(A rocker arm may include a cam arm, a valve arm, a lost motion spring, and a pair of deactivatable latches configured to prevent travel of the cam arm relative to the lost motion spring and configured to enable the cam arm to collapse the lost motion spring. The cam arm may include a cam interface, a spring pressing region, a cam arm body, and a pivot shaft connection. The valve arm may include a valve arm body, a rocker shaft bore, a latch receptacle, and a lost motion spring mount. A pivot shaft may connect the valve arm body to the cam arm body. Alternatively, a latch receptacle in the valve arm neck includes a latch assembly whereby a deactivatable latch is configured to resist movement and collapse of the cam arm such that the cam arm can collapse the lost motion spring.)

1. A rocker arm, comprising:

a cam arm, the cam arm comprising:

a cam interface at a first cam arm end;

a spring pressing region located at or near an end of the second cam arm;

a cam arm body located between the first cam arm end and the second cam arm end; and

a pivot shaft connection in the cam arm body;

a valve arm, the valve arm comprising:

a valve arm body, the valve arm body comprising:

a rocker shaft hole;

a latch receptacle;

a pivot shaft mounting area connected to the pivot shaft connection by a pivot shaft; and

an idle spring mount;

a valve arm neck extending from the valve arm body; and

a head connected to the neck, the head configured to directly or indirectly engage with an engine valve;

a lost motion spring biased between the lost motion spring mount and the spring pressing region; and

a latch assembly located in the latch receptacle, the latch assembly comprising:

a pair of deactivatable latches configured to protrude beyond the latch receptacle in an activated configuration to prevent travel of the cam arm relative to the lost motion spring, and configured to collapse into the latch receptacle in a deactivated configuration to enable the second cam arm end to act on the lost motion spring.

2. The rocker arm of claim 1, comprising at least one oil inlet port extending from the rocker shaft bore, the at least one oil inlet port connected to the latch receptacle to configure the deactivatable latch in one of the activated configuration or the deactivated configuration.

3. The rocker arm of claim 2 wherein the latch assembly comprises a center spring that biases the pair of deactivatable latches apart, wherein the at least one oil inlet port comprises a pair of oil inlet ports configured to supply pressurized oil to collapse the pair of deactivatable latches into the latch receptacles by compressing the center spring.

4. The rocker arm of claim 3 wherein the latch socket includes a controlled oil inlet port external to the latch socket.

5. The rocker arm of claim 1 wherein the latch receptacle includes a latch port on a first side configured such that a first deactivatable latch of the pair of deactivatable latches protrudes out of the valve body, and wherein the latch receptacle includes a plug on a second side configured such that a second deactivatable latch of the pair of deactivatable latches protrudes out of the valve body.

6. The rocker arm of claim 2 wherein the latch receptacle comprises a central wall separating the latch receptacles, wherein the latch assembly comprises a pair of return springs biased against respective sides of the central wall, the pair of return springs biasing the pair of deactivatable latches apart, wherein the at least one oil inlet port comprises a pair of oil inlet ports configured to supply pressurized oil to the separated latch receptacles to collapse the pair of deactivatable latches.

7. The rocker arm of claim 1 wherein the latch receptacle comprises a first latch spigot on a first side configured to cause a first deactivatable latch of the pair of deactivatable latches to protrude out of the valve body, and wherein the latch receptacle comprises a second latch spigot on a second side configured to cause a second deactivatable latch of the pair of deactivatable latches to protrude out of the valve body.

8. The rocker arm of claim 1 wherein the latch receptacle includes a first latch port on a first side configured to cause a first deactivatable latch of the pair of deactivatable latches to protrude out of the valve body, and wherein the latch receptacle includes a second latch port on a second side configured to cause a second deactivatable latch of the pair of deactivatable latches to protrude out of the valve body.

9. The rocker arm of claim 8 wherein the latch assembly comprises:

a movable member including a member body and a pair of latch grooves connected to the member body; and

a member return spring biased between the movable member and the cam arm body,

wherein the movable member is controllable to align the member body to project the pair of deactivatable latches out of the latch receptacles and to align the pair of latch recesses to collapse the pair of deactivatable latches into the latch receptacles.

10. The rocker arm of claim 9, comprising an oil inlet port extending from the rocker shaft bore, the at least one oil inlet port connected to the latch receptacle to control the movable member to configure the deactivatable latch in one of the activated configuration or the deactivated configuration.

11. The rocker arm of claim 1 wherein the lost motion spring is located between the pivot shaft and the head.

12. The rocker arm of claim 11 wherein the latch receptacles are located between the lost motion spring and the pivot shaft.

13. The rocker arm of claim 11 wherein the lost motion spring is located between the latch receptacle and the pivot shaft.

14. The rocker arm of claim 1, comprising a centerline bisecting the rocker shaft bore, wherein the pivot shaft, the lost motion spring, and the latch receptacle are located above the centerline, and wherein the cam interface is located below the centerline.

15. The rocker arm of claim 1, comprising a centerline bisecting the rocker shaft bore, wherein the pivot shaft and the lost motion spring are located above the centerline, and wherein the cam interface and the latch assembly are located below the centerline.

16. A rocker arm, comprising:

a cam arm, the cam arm comprising:

a cam interface at a first cam arm end;

a spring pressing region located at or near an end of the second cam arm;

a cam arm body located between the first cam arm end and the second cam arm end; and

a pivot shaft connection in the cam arm body;

a valve arm, the valve arm comprising:

a valve arm body, the valve arm body comprising:

a rocker shaft hole;

a pivot shaft mounting area connected to the pivot shaft connection by a pivot shaft; and

an idle spring mount;

a valve arm neck extending from the valve arm body;

a latch receptacle located in the valve arm neck; and

a head connected to the neck, the head configured to directly or indirectly engage with an engine valve;

a lost motion spring biased between the lost motion spring mount and the spring pressing region toward the spring pressing region; and

a latch assembly located in the latch receptacle, the latch assembly comprising:

a deactivatable latch configured to protrude out of the latch receptacle to prevent movement of the cam arm in a first configuration and configured to collapse in the latch receptacle in a second configuration such that the second cam arm end is movable to collapse the lost motion spring.

Technical Field

The present application provides a latch center pivoting (type III) rocker arm that is switchable between an activated configuration and a deactivated configuration.

Background

A center pivoting rocker arm, also referred to as a "type III" rocker arm, includes a cam interface at the cam end and a valve interface at the valve end. Between the two, the rocker shaft bore may be connected to pivot about the rocker shaft. Hence, the name "center pivot". This type of rocker arm is popular in vehicles and it is desirable to provide an option to be able to switch between variable valve actuation ("VVA") functions.

Disclosure of Invention

The methods and apparatus disclosed herein improve upon the art by providing a center pivoting (type III) rocker arm that is switchable between an activated configuration and a deactivated configuration to enable switching between variable valve actuation ("VVA") functions. For example, in an activated configuration, the rocker arm may communicate a first valve lift profile to an engine valve. In the deactivated configuration, the rocker arm may deliver a second valve lift profile. The second valve lift curve may be a zero lift curve, also referred to as an idle curve. The idle curve may facilitate engine operation such as cylinder deactivation ("CDA").

The rocker arm may include a cam arm, a valve arm, a lost motion spring biasing them apart, and a latch assembly.

In a first example, the rocker arm may include a cam arm including a cam interface at a first cam arm end, a spring pressing region at or near a second cam arm end, a cam arm body between the first cam arm end and the second cam arm end, and a pivot shaft connection in the cam arm body. The valve arm may include a valve arm body. The valve arm body may include a rocker shaft bore, a latch receptacle, a pivot shaft mounting region connected to the pivot shaft connection by a pivot shaft, and a lost motion spring mount. A valve arm neck may extend from the valve arm body. A head is connectable to the neck. The head may be configured to engage the engine valve directly or indirectly. The lost motion spring may be biased between the lost motion spring mount and the spring pressing region. The latch assembly may be located in the latch receptacle. The latch assembly may include a pair of deactivatable latches configured to protrude beyond the latch receptacle in an activated configuration to prevent travel of the cam arm relative to the lost motion spring, and configured to collapse into the latch receptacle in a deactivated configuration to enable the second cam arm end to act against the lost motion spring.

In a second example, the rocker arm may include a cam arm including a cam interface at a first cam arm end, a spring pressing region at or near a second cam arm end, a cam arm body between the first cam arm end and the second cam arm end, and a pivot shaft connection in the cam arm body. The valve arm may include a valve arm body. The valve arm body may include a rocker shaft bore, a pivot shaft mounting region connected to the pivot shaft connection by a pivot shaft, and a lost motion spring mount. A valve arm neck may extend from the valve arm body. The latch receptacle may be located in the valve arm neck. A head may be connected to the neck, the head being configured to directly or indirectly engage the engine valve. A lost motion spring may be biased between the lost motion spring mount and the spring pressing region toward the spring pressing region. The latch assembly may be located in the latch receptacle. The latch assembly may include a deactivatable latch configured to protrude out of the latch receptacle to prevent movement of the cam arm in a first configuration and to collapse in the latch receptacle in a second configuration such that the second cam arm end is movable to collapse the lost motion spring.

Additional objects and advantages will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages will also be realized and attained by means of the elements and combinations particularly pointed out in the appended claims.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

Fig. 1A to 1C show a first configuration of the rocker arm.

Fig. 2A and 2B illustrate a second rocker arm configuration.

Fig. 3 and 4 show alternative latch assemblies.

Fig. 5 and 6 illustrate a third rocker arm configuration.

Detailed Description

Reference will now be made in detail to the examples illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Directional reference numerals such as "left" and "right" are for ease of reference to the drawings.

The present application provides alternative deactivating rocker arms. Fig. 1A and 2A provide an alternative rocker arm including a through-valve mechanical latch assembly and a pivot arm arrangement. The rocker arms include a centerline bisecting the rocker shaft bore. It can be said that the pivot shaft, lost motion spring and latch socket are located above the midline and the cam interface is located below the midline. The latch assembly position may affect the force on valve actuation.

Fig. 5 provides an alternative deactivated rocker arm. The pivot arm arrangement includes a centerline bisecting the rocker shaft bore, wherein the pivot shaft and the lost motion spring are located above the centerline, and wherein the cam interface and the latch assembly are located below the centerline. In this configuration, a three-point interaction may be provided between the positions of the latch assembly, rocker shaft and pivot shaft, which may be optimized to vary the stress level on the latch assembly.

In each figure, lost motion springs 680, 400, 401 are located between pivot shaft 40 and heads 665, 270. In fig. 2A, the latch receptacle is located between the lost motion spring 401 and the pivot shaft 40. In fig. 1, a lost motion spring 400 is located between the latch receptacle and the pivot shaft 40.

Returning to fig. 1A and 2A, a deactivated type III (center pivot) rocker arm may be comprised of two components, including cam arm 100 and valve arms 200, 201, and mechanical latch assemblies 500, 550, 600, 700. The cam arm 100 may be configured to pivot about the pivot axis 40 and selectively transmit movement of the cam to the valve arm 200 through the mechanical latch assembly 500, 550, 600. The rocker arms 1, 2 are able to deactivate valve motion in a type III valve train.

Deactivating type III (center pivot) rocker arms 1, 2 may be comprised of two components, including cam arm 100 and valve arms 200, 201, and mechanical latch assemblies 500, 550, 600, 700. The first member may be a valve side arm 200, 201 characterized by a pivot (typically the rocker shaft bore 230 of a rocker shaft), a mechanical latch assembly 500, 550, 600, 700 connecting the first member to the second member, and an HLA 70 or mechanical lash adjustment screw to be engaged with a valve or valve bridge. The second member may comprise or consist of a cam arm 100. On the first end cam arm end 110, the cam interface area may include rollers 10 and roller shafts 9 for engaging with cams on a camshaft. The second cam arm end 150 of the cam arm 100 may include a latch interface for engaging with a mechanical latch assembly. The pivot shaft 40 may connect the first member and the second member, allowing the second member to pivot in a lost motion manner when the latch assembly of the first member is disengaged.

Lost motion springs 400, 401 may be configured to bias the two members apart from each other. When the mechanical latch assembly 500, 550, 600, 700 is disengaged, the lost motion springs 400, 401 maintain dynamic control of the second member as it pivots about the pivot shaft 40.

The mechanical latch assembly, when engaged, converts movement of the second member to the first member. When disengaged, the mechanical latch assembly is configured to allow the second member to move freely about the pivot axis 40. The latch assembly may be oriented in a variety of ways according to fig. 1A, 2A, 3, 4, and 6, and may be hydraulically or mechanically actuated to switch between an activated configuration (engaged) and a deactivated configuration (disengaged).

In fig. 2A and 6, a double latch configuration of a type III deactivating rocker arm is shown. Thus, the rocker arms 1, 2, 3 may be cylinder deactivation ("CDA") rocker arms of a type III (center pivot) valvetrain. While a single latch pin (deactivatable latch 501) may have high contact stress where the latch pin and rocker arm body meet, it may distribute the load over both latch pins (deactivatable latches 60 or 701) to significantly reduce contact stress. Positioning the two deactivatable latches 60 or 701 to collapse inwardly about the bearing shaft 9 requires two oil inlet passages 693, 694 within the rocker arm body 666. The two oil inlet passages 694, 694 may originate from the rocker shaft hole 663 at the center position 693 and branch off within the rocker body.

Deactivating the center pivoting rocker arm 1, 2 may include a valve arm 200, 201 that includes a pivot shaft (such as the rocker shaft bore 230), a mechanical latch mechanism (such as one of the latch assemblies 500, 550, 600, 700), and an HLA 70 or mechanical lash adjustment screw configured to engage a valve or valve bridge, such as through an elephant foot (e-foot) extending from the head 270 of the valve arm 200, 201. The second member includes a cam arm 100. Such a cam arm 100 may include a roller 10 and a roller shaft 9 for engagement with a camshaft. The second cam arm end 150 may form a latch interface, such as a flange for engaging a mechanical latch in the form of the latch assembly 500. A mechanical latch in the form of a mechanical latch assembly 500 selectively mechanically connects the first member to the second member, such as by a flange pressing on a protruding deactivatable latch 501. In the alternative, second cam arm end 150 includes extension 160 to mechanically connect the first member to the second member, such as by extension 160 pressing on protruding deactivatable latch 60, 90, or 701.

The pivot shaft 40 may connect the first member and the second member such that the second member pivots in a lost motion manner when the deactivatable latch mechanism of the first member disengages and collapses into the latch receptacle in the deactivated configuration.

Lost motion springs 400, 401 may be configured to bias the first and second members apart from each other. When the mechanical latch assembly is disengaged, the lost motion spring maintains dynamic control of the second member as it pivots about the pivot shaft 40. The mechanical latch assembly 500, 550, 600, 700, when engaged in the activated configuration, translates movement of the second member to the first member. When the mechanical latch assembly is disengaged, the mechanical latch assembly is configured to allow the second member to move freely about the pivot axis 40. In some configurations, the pivot shaft may be omitted, and pivoting may occur freely about the rocker shaft aperture 230, such as by extending a portion of the cam arm body 110 to surround the rocker shaft aperture 230. The pivot shaft includes a rocker shaft hole.

The mechanical latch assemblies 500, 550, 600, 700 are shown as being hydraulically actuated, but alternatively may be mechanically actuated to switch between an engaged position (activated configuration) and a disengaged position (deactivated configuration).

The rocker arm of the type III valvetrain may alternatively include a cam arm 675 that includes a first cam arm end 673 that includes a cam interface, such as a roller 10 on a bearing shaft 9. The bearing shaft 9 may be mounted in a bore 679 in the first cam arm end 673. The roller bearing 10 may be mounted on a bearing shaft 9 in a bearing shaft bore 679 between the first and second segments 675, 676. Second cam arm end 672 may include a spring pressing region in the form of a socket for mounting lost motion spring 680. The cam arm body 670 may be hollow to include a first section and a second section extending therefrom. The first and second sections may include first and second latch extensions 651, 652. The second latch extension 652 is shown in phantom in fig. 5. The first and second segments may include bearing shaft holes 679. The first and second sections 675, 676 may include pivot shaft connections for receiving the pivot shaft 40. The pivot shaft 40 may be held by a clamp, for example. The latch extensions 651, 652 can include opposing first and second latch ports 677, 678.

The valve arm 660 may include a lost motion spring mount 662 in the form of a second socket in the valve side body 666. 663 rocker shaft holes may be formed so that the branch oil inlet passage extends from the rocker shaft holes 663 to the latch receptacles 690. The oil intake path includes a first oil intake branch forming an oil intake port 693 and a second oil intake branch forming an oil intake port 694, which expands from the central bore 664. The latch assembly 700 may be configured in a latch receptacle 690.

The latch receptacle 690 may include a central wall 691 that divides the latch receptacle into a first half 696 and a first half 695. The latch assembly 700 includes a pair of return springs 704 biased against respective sides of a central wall 691. The pair of return springs bias the pair of deactivatable latches 701, 702 apart such that the latches protrude through the first latch port 677 and the second latch port 678 when in the activated configuration. To switch the rocker arm to the second configuration, which includes the deactivated configuration, at least one oil inlet port, including the pair of oil inlet ports 693, 694, supplies pressurized oil to a separate latch receptacle to collapse the pair of deactivatable latches. The separate latch receptacle may include a plug 703 such that a first plug and a second plug surround the first deactivatable latch 701 and the second deactivatable latch 702. The plug 703 may be disposed in the latch receptacle 690 to fluidly seal the deactivatable latch and the latch receptacle 690.

The rocker arms 2, 3 may include cam arms 100, 670 that include a cam interface at a first cam arm end 102, 673. The cam interface may be a push rod or roller bearing 10. A spring pressing region 140, 672 at or near the second cam arm end 150, 672, a cam arm body 110 between the first cam arm end 102, 673 and the second cam arm end 150, 672, and a pivot shaft connection 104 in the cam arm body 110. The valve arm 201, 660 may include a valve arm body 284, 666. The valve arm body 284, 666 may include a rocker shaft bore 230, 663, a latch receptacle 244, 690, a pivot shaft mounting region 204 connected to the pivot shaft connection 104 by the pivot shaft 40, and a lost motion spring mount 243, 662, such as a receptacle. The valve arm necks 281, 661 may extend from the valve arm bodies 284, 666. The head 270, 665 may be connected to the neck 281, 661. The heads 270, 665 may be configured to engage the engine valve directly or indirectly, such as through an e-foot or valve bridge, bladder, or the like. Lost motion springs 401, 680 may be biased between lost motion spring mounts 243, 672 and spring pressing regions 140, 662. The latch assemblies 550, 600, 700 may be located in the latch receptacles 244, 690. The latch assembly may include a pair of deactivatable latches 66, 91 or 701, 702 configured to protrude from latch receptacles 244, 690 in an activated configuration to prevent travel of cam arms 100, 670 relative to lost motion springs 401, 680, and configured to collapse into the latch receptacles in a deactivated configuration to enable second cam arm end 150, 672 to act on lost motion springs 401, 680. Cam arm 100 may collapse lost motion spring 401. The lost motion spring 680 may collapse or shear.

At least one oil inlet port 253, 260, 255, 664 extends from the rocker shaft bore 230, 663. At least one oil inlet port is connected to the latch receptacles 252, 244, 690 to configure the deactivatable latches 66, 91 or 701, 702 into one of an activated or deactivated configuration.

In fig. 3, latch assembly 600 includes a center spring 65 biasing the pair of deactivatable latches 66 apart. The at least one oil inlet port includes a pair of oil inlet ports 260 configured to supply pressurized oil to collapse the pair of deactivatable latches 66 into the latch receptacles by compressing the center spring 65. Each deactivatable latch 66 may include a spring cup 63, a base portion 61, and a latch pin 64. Pressurized oil flowing from the rocker shaft bore 230 to the gland 233 flows through the oil inlet port 260. The pressure pushes the base portion 61 to slide in the cavity 256 and collapse the center spring 65. The timing of deactivation may be controlled by including a controlled oil inlet port 62 outside of the latching receptacle. The size of the controlled oil inlet port 62 controls the rate of oil leakage and at which latching position oil may leak and depressurizes the deactivatable latches 66 to return to their protruding position under the bias of the center spring 65. The latch receptacle may include a retaining wall 2571, and the controlled oil inlet port 62 may pass through the retaining wall 2571.

The latch receptacle may include a latch port 259 on the first side 257 configured such that a first deactivatable latch of the pair of deactivatable latches protrudes out of the valve body. The latch receptacle may include a plug 290 on the second side 258 configured such that a second deactivatable latch of the pair of deactivatable latches protrudes out of the valve body.

The rocker arm may alternatively comprise the latch assembly 700 of fig. 5 and 6, meaning that any one of the rocker arms 2 and 3 may comprise any one of the dual latch assemblies 550, 600, 700. The latch receptacle 690 may include a center wall 691 that separates the latch receptacles 690. The latch assembly 700 may include a pair of return springs 704 biased against respective sides of the central wall 691, the pair of return springs 704 biasing the pair of deactivatable latches 701, 702 apart. The at least one oil inlet port includes a pair of oil inlet ports 693, 694 configured to supply pressurized oil to separate latch receptacles to collapse the pair of deactivatable latches 701, 702. The latch receptacle 690 may include a first latch plug 703 on a first side configured such that a first deactivatable latch 701 of the pair of deactivatable latches protrudes out of the valve body 666. The latch receptacle may include a second latch plug 703 on a second side configured such that a second deactivatable latch 702 of the pair of deactivatable latches protrudes out of the valve body 666. The valve body may include a latch extension 699 to position the latch assembly 700 below the centerline of the rocker arm and adjacent the cam interface. In this configuration, a three-point interaction may be provided between the latch assembly 700, the rocker shaft in the rocker shaft aperture 663, and the location of the pivot shaft 40, which may be optimized to vary the stress level on the latch assembly 700.

Turning to fig. 4, the latch assembly 550 includes an alternative configuration. The latch socket includes a first latch port 259 on the first side configured such that a first deactivatable latch of the pair of deactivatable latches 91 protrudes out of the valve body. The latch socket includes a second latch port 259 on a second side configured such that a second deactivatable latch of the pair of deactivatable latches 91 protrudes out of the valve body. The movable member 900 reciprocates in the latch-socket cavity 258 between the upper half 257 and the lower half 256 of the latch socket. The movable member 900 includes a member main body 90 and a pair of latch grooves 92 connected to the member main body 90. A member return spring 99 is biased between the movable member 900 and the cam arm body 110. Member return spring 99 may be secured in spring cup 94, or, similar to lost motion springs 400, 401, 680, member return spring 99 may be secured by another mounting feature such as a peg, socket, lip or groove, or the like. Movable member 900 is controllable to align member body 90 to project the pair of deactivatable latches 91 out of the latch receptacles in the activated configuration, and movable member 900 is controllable to align the pair of latch recesses 92 to collapse the pair of deactivatable latches 91 into the latch receptacles. With the latch groove 92 aligned with the deactivatable latch 91, when the extension 160 of the cam arm is pressed downward due to the force received at the cam interface, the extension 160 pushes a ball or other shaped protrusion into the latch groove 92. The pressure of spring 99 and the oil pressure of oil inlet port 255 are controlled to control movable member 900. The oil pressure of the base 93 lifts the movable member 900, and the return spring 99 may push the movable member 900 in the absence of the oil pressure. Assistance of the cam arm 100 pushing against the return spring or spring cup 94 is also possible.

Thus, it can be said that the rocker arm can include one oil inlet port 255 extending from the rocker shaft bore 230, 663, at least one oil inlet port 255 being connected to the latch receptacle to control the movable member 900 to configure the deactivatable latch 91 in one of the activated or deactivated configurations.

In fig. 1A, rocker arm 1 may include a cam arm 100 including a cam interface at a first cam arm end 102, a spring press area 140 at or near a second cam arm end 150, a cam arm body 110 between the first cam arm end 102 and the second cam arm end 150, and a pivot axle connection 104 in the cam arm body 110. The valve arm 200 may include a valve arm body 283. Valve arm body 283 may include a rocker shaft bore 230, a pivot shaft mounting region 204 connected to pivot shaft connection 104 by pivot shaft 40, and a lost motion spring mount 241. The lost motion spring mount 241 may include a socket or the like. The valve arm neck 280 may extend from the valve arm body 283. The latch receptacle 252 may be located in the valve arm neck 280. The head 270 may be connected to the neck 280, the head 270 being configured to directly or indirectly engage with an engine valve. The lost motion spring 400 may be biased toward the spring pressing region between the lost motion spring mount 241 and the spring pressing region 140. The latch assembly 500 may be located in the latch receptacle 252. Latch assembly 500 may include a deactivatable latch 501 configured to protrude out of latch receptacle 252 to prevent movement of cam arm 100 in a first configuration, and to collapse latch receptacle 252 in a second configuration such that second cam arm end 150 can move to collapse lost motion spring 400.

Latch assembly 500 may include a deactivatable latch 501 that is biased to protrude by a return spring 505 at a spring mount, such as spring cup 504. The deactivatable latch 501 may be retained in the latch receptacle cavity 252 by a frit or plug 251. The spring cup 504 may form a seal against the wall 250 of the cavity 252 such that the deactivatable latch 501 may slide against the wall 250 when pressurized oil is supplied by the oil inlet port 253. Additional walls may be included to enclose the latch assembly 500 in a latch receptacle. The latch pin 503 of the deactivatable latch 501 may trap a flange on the second cam arm end 150 when it protrudes, and may pass the latch pin 503 when oil pressure collapses the deactivatable latch 501 in the latch receptacle.

Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the examples disclosed herein.