Pivot bracket assembly, actuator assembly and valve train

Abstract

The present invention discloses a pivot bracket assembly for a valve mechanism, the pivot bracket assembly comprising a pivot pin, a first bracket and a second bracket, the first bracket comprising a first mounting area capable of rotating around the pivot pin and a first reaction arm extending away from the first mounting area, the second bracket comprising a second mounting area capable of rotating around the pivot pin and a second reaction arm extending away from the first mounting area. The compliance member comprises a receiving leg biased against the first bracket and a transmitting leg biased against the second bracket. The biasing member comprises a first leg biased against the second bracket and a second leg configured to mount the biasing member relative to the pivot pin. The biasing member is configured to resist a biasing force from the compliance member. The actuator assembly can be mounted so that the rotatable shaft is perpendicular to the pivot pin.

Description

Technical Field

[0001] The present application provides a pivot bracket assembly vertically mounted in a valve mechanism. The actuator assembly and the latch assembly may have axes parallel to the pivot bracket assembly, and the pivot bracket assembly extends along a pivot pin perpendicular thereto. Background Art

[0002] The weight, material usage and size of the valve train are scrutinized. Also, it is desirable to have variable valve actuation ("VVA"), such as cylinder deactivation, engine braking, early or late valve opening or closing, and combinations thereof. VVA must also avoid critical shifts. Summary of the invention

[0003] The method and apparatus disclosed herein overcome the above disadvantages and improve the prior art by means of a pivot bracket assembly that can be vertically mounted in the valve train. Light weight, small size and compact packaging can thereby be achieved. A latch device such as a rocker arm can be loaded by the pivot bracket assembly so that the latch moves in an appropriate latch and unlock window. The effective vertical mounting is actuated by an actuator assembly mounted perpendicular to the pivot pin of the pivot bracket assembly, rather than having the actuator spread across the valve train.

[0004] The present invention discloses a pivot bracket assembly for a valve mechanism, the pivot bracket assembly comprising a pivot pin, a first bracket and a second bracket, the first bracket comprising a first mounting area capable of rotating around the pivot pin and a first reaction arm extending away from the first mounting area, the second bracket comprising a second mounting area capable of rotating around the pivot pin and a second reaction arm extending away from the first mounting area. The compliant member comprises a receiving leg biased against the first bracket and a transmitting leg biased against the second bracket. The biasing member comprises a first leg biased against the second bracket and a second leg configured to mount the biasing member relative to the pivot pin. The biasing member is configured to resist a biasing force from the compliant member. As an option, the receiving leg can be biased against the first reaction arm, and the transmitting leg can be biased against the second reaction arm. As an option, the first leg can be biased against the second reaction arm.

[0005] The first mounting plate may be located on the first end of the pivot pin and the second mounting plate may be located on the second end of the pivot pin. The second leg may be mounted against the second mounting plate. The second reaction arm may include a locating tab adjacent to the second mounting plate. The first mounting plate may include a first mounting location adjacent to a second mounting location of the second mounting plate.

[0006] The pivot pin may include a diameter change. A bushing may be seated on the pivot pin, the bushing abutting the compliant member. The bushing may surround a portion of the pivot pin, and the second bracket may be mounted to the bushing.

[0007] The biasing member may be a torsion spring coiled around the bushing. The compliant member may also be a torsion spring coiled around the pivot pin.

[0008] The actuator assembly may include a pivot bracket assembly. The actuator assembly may include a rotatable shaft perpendicular to the pivot pin and a cam lobe mounted to the rotatable shaft. The cam lobe may be configured to rotate against the first reaction arm. The controller may be configured to rotate the rotatable shaft.

[0009] The valve mechanism may include an actuator assembly and a pivot bracket assembly. The valve mechanism may include a latch device. The latch device may include a latch pin protruding toward the second reaction arm. The second reaction arm may be configured to actuate the latch device according to a cam profile of a cam lobe when the rotatable shaft rotates.

[0010] The latch pin may be actuatable in an axial direction parallel to the main axis of the rotatable shaft. The latch device may be a rocker arm rotatable about a rocker arm shaft. The rocker arm shaft may be parallel to the rotatable shaft.

[0011] Other purposes and advantages will be described in part in the following description, and in part will be apparent from the description, or may be learned through practice of the disclosed content. The purposes and advantages will also be realized and achieved by means of the elements and combinations particularly pointed out in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is an illustration of an exemplary rocker arm compatible with the teachings herein.

[0013] FIG. 2A to FIG. 2C is an illustration of a latch assembly including a latch pin compatible with the teachings herein.

[0014] Figure 3 is a view of a valve train including an actuator assembly and a pivot bracket assembly relative to an exemplary rocker arm.

[0015] Figure 4 is a view of the pivot bracket assembly.

[0016] FIG. 5A to FIG. 5C is a view of the pivot bracket assembly relative to the latch pin of the latch device and relative to the cam of the actuator assembly.

[0017] Figure 6 is an exploded view of the pivot bracket assembly.

[0018] Fig. 7A and Figure 7B is a diagram showing exemplary pressure points of a compliant member and a biasing member. DETAILED DESCRIPTION

[0019] The actuator assembly 100 may be an electromechanical actuation system (“EMS”) and may be used to actuate a latch pin system 50 in a valvetrain component, such as a rocker arm 1 , 2 .

[0020] The valve train 140 may include a latching device. In an unlatched state, the latching device provides one function, such as cylinder deactivation, nominal valve lift, or low lift VVA event. In a latched state, the latching device may provide another function, such as engine braking, high lift VVA event, and other options. The latching device may be installed in many locations in the valve train, such as in a tower or carrier or in a cylinder head. Alternatively, the rocker arm 1, 2 may include a latching assembly.

[0021] exist Figure 1 , an exemplary rocker arm 1 is shown. It includes dual rollers 23, 24 mounted on the cam end body portion 19, 20, 21 of the rocker arm 1. A latch pin 30 protrudes from the cam end body portion 19. The rocker arm 1 includes a valve end portion having two valve arms 12, 13 and features such as an electronic foot 16, a locking nut 15 and a sleeve 14. The rocker arm body 11 includes a rocker shaft hole 17 in which a bushing 18 can be seated. A reaction plate 26 can be mounted by a fastener 27 to secure a lost motion spring 25.

[0022] exist FIG. 2A to FIG. 2C In FIG. 2 , a rocker arm 2 is shown with a single roller 24 , and actuation thereof can be applied to the rocker arm 1 .

[0023] The deactivation technique of the roller 24 is shown with a three-pin latch pin system. An electromechanical system is arranged to actuate the latch pin system 50 via an actuator assembly 100. Electromechanical actuation enables low temperature actuation of the latch pin system. The rocker arms 1, 2 or other valve train components can then implement variable valve actuation (VVA), such as cylinder deactivation (CDA), engine braking (EB), early exhaust valve opening (EEVO), late intake valve closing (LIVC) and many other options for opening or closing valves at one or more variable timings (iEGR, NVO, EIVO, LEVC, LIVO, etc.).

[0024] Other examples of rocker arms including alternative latch pin systems can be found in at least US7673602, US8550047, US6604498, US6325030, US11286817, etc. Such latch pin systems may be modified to be compatible with the teachings herein.

[0025] The latch pin system can be mounted in a roller bearing above the cam of a Type III center pivot rocker arm system, or in a roller bearing of a Type II end pivot rocker arm system, or in the body of a Type III rocker arm system, such as in the body piece at the end of the valve or in the body piece adjacent to the rocker arm shaft. Alternatively, instead of serving as a bearing shaft or insert as a bearing shaft, the latch pin assembly can be formed in the body portion attached to the sliding pad. Then, a switchable roller thumbwheel follower, a separate rocker arm, or a switchable rocker arm can be designed.

[0026] Working example in FIG. 2A to FIG. 2C . The three-pin latch pin system 50 is mounted as a bearing shaft on the cam side in the Type III center pivot rocker arm 2. In this example, the latch pin system 50 is biased to deactivate the inner arm 22 of the rocker arm 2. The outer arm 19, 20 as the cam end body portion may include oil supply ports 41, 42 to lubricate the latch pin 30 (also called the first latch pin) and the third latch pin 32 or provide oil pressure to the latch pin 30 and the third latch pin 32. The inner arm 22 can be latched to transmit the lift profile ( Figure 2C ), or the inner arm 22 may be unlocked ( Figure 2A ) so that the inner arm 22 moves in a lost motion manner. In this working example, the roller 24 includes a shaft 55 with a pin hole 52, in which the second latch pin 31 can slide. The outer arms 19, 20 include pin holes 51, 53. The first latch pin 30 can be limited in travel by a snap ring 35, a bushing, or an integrally cast or integrally molded or drilled edge or step or similar feature. In this working example, the first latch pin 30 is formed as a step so that a portion protrudes from the pin hole 51 and another portion can slide in the pin hole 51. The second latch pin 31 is shown flush with the pin hole 52. The third latch pin 32 is configured to slide in the pin hole 53. The pin hole 53 can include many options, but is shown as having a snap ring 34 to seat the buffer spring 33. The snap ring 34 can alternatively be a blind hole feature in the outer arm 20, or a cast, molded or drilled edge or step, or a bushing or plug, among other options. A bleed port or other controlled orifice may be included, and control logic may be applied to the oil supply port 42 to provide oil to the third latch pin 32. The third latch pin 32 may include a spring cover or other guide feature for the buffer spring 33. A tab or one or more nose features may be included on the surface of the third latch pin 32 and on the surface of the first latch pin 30 to abut the second latch pin 31. Such nose features may cause the first latch pin 30 and the third latch pin 32 to retract into their respective pin holes 51, 53 when the inner arm 22 moves in a lost motion manner. For example, as taught in commonly owned US 11,286,817, nose features, stepped holes, stepped latch pins, and other options may be included.

[0027] In the working example, the latch pin system 50 is biased by the reaction force CF from the buffer spring 33 so that the second latch pin 31 is centered between the outer arms 19, 20. Then, the cam lift profile is not transmitted to the valve end through the rocker arm 2. However, when the latch pin system 50 is actuated by the actuation force AF to Figure 2A Position travel to Figure 2B position, the second latch pin 31 travels into the outer arm 20 and the first latch pin 30 travels into the bearing shaft 55, so that the cam lift profile is transmitted to the valve end through the latched outer arms 19, 20. On the base circle of the cam lift profile, the latch pins 30-32 can be coaxially aligned ( Figure 2A and Figure 2B ). A switching window can be manufactured into the cam lift profile to balance the forces from the valve return spring, the lost motion spring 25 and the cam lobe so that the buffer spring 33 in the third latch pin 32 can push the second latch pin 31 into the center position, or so that the buffer spring 33 can be overcome by the force F.

[0028] To prevent unwanted travel, a gap G may be formed in the outer arms 19, 20. The inner arm 22 may then travel slightly relative to the outer arms 19, 20, but the negative roller is not allowed to rotate. The inner arm 22 follows the cam lobe but does not rotate excessively in response to the force from the lost motion spring 25. The first latch pin 30 and the second latch pin 31 may travel into the gap G to avoid losing contact with the cam ( Figure 2C ). A shoulder may be formed in the first latch pin 30 for securely seating in the corresponding gap G.

[0029] To actuate the latch pin system 50, an electromechanical actuator may be installed in the valve train 140. The rotating coupling 110 may be formed as one half of the actuator assembly 100. The rotating coupling 110 may be configured to provide an actuation force AF to the second half of the actuator assembly 100, the pivot bracket assembly 200. The rotating coupling 110 may be mounted via a mounting bracket 115 or a cylinder head or carrier feature or tower feature 114. The controller 112 may include a motor that converts an electrical signal into a mechanical rotation of the rotatable shaft 111. An onboard computer or electronic control network may be coupled or co-located with the controller 112 to provide an electrical signal to the motor. Many alternatives exist in the art. For example, the rotation of the rotatable shaft 111 may be linked to the camshaft rotation via the controller 112 through a connecting rod such as a gear train or gear transmission mechanism. Although a rotary coupling 110 is disclosed for this working example, other devices, such as a direct-acting solenoid or a linear actuator, are not prohibited from being combined with the teachings herein to form one half of the actuator assembly 100 .

[0030] Although it is possible to have individual rocker arm controls, the rocker arm groups 1, 2 may be controlled via a rotatable shaft 111. The rotatable shaft 111 may be parallel to the main axis of one or more of the rocker arm shaft, valve lift camshaft, latch pin system 50, or bearing shaft of the rocker arms 1, 2. A tight footprint may be achieved.

[0031] exist FIG. 5A to FIG. 5C In the embodiment, the rotatable shaft 111 is parallel to the latch pin system 50. The latch pin system motion actuation axis and the rotatable shaft main axis are parallel. This facilitates compact installation. The rotatable shaft 111 may include a rotatable connecting rod such as a cam 113 or a spring, and there are many options in the art. The working example includes a cam 113 having a base circle 1131 and a lift lobe 1132. The rotational motion of the rotatable shaft 111 can be converted into a linear motion of the latch pin system 50 by the pivot bracket assembly 200. The pivot bracket assembly 200 can be erected in the valve mechanism tower area in a compact arrangement. The latch pin system 50 can move on an axis perpendicular to the main axis of the pivot bracket assembly 200. Based on the packaging constraints within the engine layout, the connecting rod of the pivot bracket assembly 200 can be positioned anywhere along the axial direction of the rotatable shaft 111. Through the design of the rotating coupling 110, the controller 112 can be installed outside or inside the cylinder cover or cylinder block as needed.

[0032] The pivot bracket assembly 200 may include a linkage assembly to form an actuator that acts in unison with the actuator assembly 100. The pivot bracket assembly 200 for the valve train 140 may include a pivot pin 230, a first bracket 240, a second bracket 250, a compliance member 260, and a biasing member 280.

[0033] The pivot pin 230 may be mounted vertically in the valve train 140. The pivot pin 230 may be adjacent to the rocker arm 1, 2 or other valve train components. Figure 3 and FIG. 5A to FIG. 5C As shown, the pivot pin 230 and pivot bracket assembly 200 fit in a tight space next to the rocker arms 1, 2. The tower mount 120 and fasteners 121 of the cylinder head 130 can be used to secure the pivot bracket assembly 200 in place, and the pivot bracket assembly 200 fits in the small space between the tower mount 120 and the rocker arms 1, 2. Now, the manifold above the valve train can maintain a small footprint because the actuator assembly 100 can be mounted close to the valve train components.

[0034] The pivot pin 230 may include a head 236 and a neck 237. The upper or first end 231 may abut the upper or first mounting plate 210. The lower or second end 232 may abut the lower or second mounting plate 220. The first mounting plate 210 and the second mounting plate 220 may include holes, depressions or other seating arrangements to locate the upper end 231 and the lower end 232 of the pivot pin 230. The pivot pin 230 may also include an optional locating groove 235. Additional locating steps or grooves may be used for purposes such as light weight or for locating or guiding the connecting rod. An optional hitch pin 233 and hitch hole 234 arrangement may be used to lock the pivot pin 230 in the pivot bracket assembly 200. The hitch pin 233 may take a variety of forms and may alternatively be replaced by a snap ring, bushing or locking pin.

[0035] The first bracket 240 may include a first mounting area 242 that can rotate around the pivot pin 230 and a first reaction arm 243 that extends away from the first mounting area 242. As an option, the first bracket body 241 may include a stamped, molded or formed sheet or a flanged tubular structure or a component with a through hole. In the working example, the sheet is bent to form the first mounting area 242. Other options such as through holes or tubular structures can be used. The first reaction arm 243 can be integrated or integrally formed with the first bracket body 241 and the first mounting area 242. The first reaction arm 243 can be sized and shaped according to the specifications of the valve mechanism 140. The first reaction arm 243 can be shaped to bend around a component like the fastener 121, or can be shaped to extend toward the cam 113 of the rotating coupling 110. The contact profile of the first reaction arm 243 can be formed so that a smooth contact is established between the cam 113 and the first bracket 240. As a first positioning diameter of the pivot bracket assembly 200 , the first mounting area may surround the head 236 of the pivot pin 230 .

[0036] The second bracket 250 may include one or more second mounting areas 252 that can rotate around the pivot pin 230 and a second reaction arm 253 extending away from the second mounting area 252. The contact profile of the second reaction arm 253 can be formed so that a smooth contact is established between the latch pin 30 and the second bracket 250. As an option, the second bracket body 251 can be a stamped, molded or formed sheet or a flanged tubular structure or a component with a through hole. In this working example, the lightweight sheet is bent at two locations to form two second mounting areas 252. Although the second mounting area 252 can be directly adjacent to the pivot pin 230, this working example includes a bushing 270 that slides on the positioning groove 235 of the pivot pin 230, and the second mounting area 252 is adjacent to the bushing 270. The pivot pin 230 may include a diameter change. The bushing 270 can be seated on the pivot pin 230, and the bushing 270 is adjacent to the compliance member 260. The bushing 270 may surround a portion of the pivot pin 230. The second bracket 250 may be optionally mounted to the bushing 270.

[0037] A second reaction arm 253 extends from the second bracket body 251. An optional locating tab 254 may extend from the second reaction arm 253. As an example, the locating tab 254 may ride on the second mounting plate 220 to help stabilize actuation of the pivot bracket assembly 200. Alternatively, the locating tab 254 may perform another function, such as being sized or shaped to extend away from the pivot pin 230 to push the latch pin 30 of the latch pin system 50.

[0038] The compliant member 260 may include a receiving leg 261 that is biased against the first bracket 240. In this working example, the receiving leg 261 is shown as being biased against the first reaction arm 243, but as an option, the receiving leg 261 can be positioned in a mounting hole or slot or against another surface of the first mounting area 242. When the first reaction arm 243 is pushed, the receiving leg 261 can be bent or angled to receive the actuation force AF. The compliant member 260 has several mounting options as long as the receiving leg 261 receives the actuation force AF from the rotating coupling 110 (in this example, the actuation force AF from the cam 113). Similarly, the transmission leg 263 has several options for transmitting the actuation force AF to the second bracket 250. This working example shows the transmission leg 263 biased against the second reaction arm 253, but it can also be bent or angled to push the actuation force AF toward the second bracket 250. The positioning of the compliance member 260 allows reverse movement to return the pivot bracket assembly 200 to the non-actuated position. The reaction force CF from the buffer spring 33 can push the latch pin 30 against the second reaction arm 253. In the event that the latch pin 30 sticks, the compliance member 260 can provide a buffer to manage and absorb cam rotation.

[0039] The biasing member 280 may also provide a reaction force CF. The biasing member 280 includes a first leg 281 that is biased against the second bracket 250. In this working example, the first leg 281 is biased against the second reaction arm 253. The second leg 283 may be configured to mount the biasing member 280 relative to the pivot pin 230. For example, a hole or slot may receive the second leg 283, or as shown, the second leg may be located on the side of a portion of the second pin flange 224. The second leg 283 may be mounted against the second mounting plate 220. The biasing member 280 may be configured to resist the biasing force from the compliance member 260 so that when the cam 113 is on the base circle 1131, the reaction force CF from the buffer spring 33 and from the biasing member 280 may move the latch pin system 50 to its normal biased position ( Figure 2A and Figure 5B ). However, when the cam 113 pushes the lift lobe 1132 against the first reaction arm 243, the buffer spring 33 and the biasing member 280 are overcome, and the actuation force AF actuates the latch pin 30 ( Figure 5C ).

[0040] The biasing member 280 may be a torsion spring coiled around the bushing 270 or around the pivot pin 230. The compliant member 260 may also be a torsion spring coiled around the pivot pin 230. As an example, the bushing 270 may be included to provide a guide for the positioning of the compliant member 260. The bushing 270 may include a curled edge 271 or other lip or edge that secures the placement of the compliant member 260 along the main axis of the pivot pin 230. The bushing 270 may also provide support for the second mounting area 252, or may provide a rotating surface that facilitates smooth rotation of parts in the pivot bracket assembly 200. The cutouts in one or more of the second reaction arm 253 and the second mounting area 252 may form a seat in the second bracket body 251 to position the biasing member 280 along the pivot pin 230. Although a torsion spring is shown for this working example, a leaf spring may also be used.

[0041] The biasing member 280 may be a torsion spring as a link to ensure that both the first bracket 240 and the second bracket 250 are loaded against adjacent members (the first bracket 240 is loaded against the cam 113 and the second bracket 250 is loaded against the latch pin 30 ).

[0042] The first mounting plate 210 may be located on the first end 231 of the pivot pin 230, and the second mounting plate 220 may be located on the second end 232 of the pivot pin. The first mounting plate 210 may include a first mounting location 212 adjacent to the second mounting location 222 of the second mounting plate 220. The first mounting plate 210 may include a first mounting plate body 213 including a first pin flange 214 having a first pin seat 211, such as a hole, groove, depression, etc., among other options. The first mounting location 212 may include a through hole for fastening to a cylinder head 130 or a tower mount 120, such as designed into the valve train 140. The second mounting plate 220 may similarly include a second mounting plate body 223 including a second pin flange 224 having a second pin seat 221, such as a hole, groove, depression, etc., among other options. The second mounting location 222 may include a through hole for fastening to the cylinder head 130 or tower mount 120 as designed into the valve train 140. The first mounting location 212 and the second mounting location 222 may be clamped together for simultaneous mounting. Struts, tabs, supports, stakes may replace the through holes in the first mounting location 212 and the second mounting location 222, among other options.

[0043] Features of the first mounting plate 210 and the second mounting plate 220 can provide benefits to the pivot bracket assembly 200, such as additional stability or packaging. For example, the second pin flange 224 can stabilize and position the biasing member 280. The second leg can be mounted against the second mounting plate. As another example, the second reaction arm 253 can include a locating tab 254 adjacent to the second mounting plate 220. As a guiding or stabilizing aspect, the locating tab 254 can sweep over or ride against the second pin flange 224.

[0044] The actuator assembly 100 may include a pivot bracket assembly 200. The actuator assembly 100 may include a rotatable shaft 111 perpendicular to a pivot pin 230, and a cam 113 may be mounted to the rotatable shaft 111. The cam 113 may be configured to rotate against a first reaction arm 240. The controller 112 may be configured to rotate the rotatable shaft 111.

[0045] The valve mechanism 140 may include an actuator assembly 100 and a pivot bracket assembly 200. The valve mechanism 140 may include a latch device, such as rocker arms 1, 2. The latch device may include a latch pin system 50 having a latch pin 30 that protrudes toward a second reaction arm 253. The second reaction arm 253 may be configured to actuate the latch pin system 50 according to a cam profile of the cam 113 when the rotatable shaft 111 rotates.

[0046] The latch pin 30 may be actuated in an axial direction parallel to the main axis of the rotatable shaft 111. The latching device may be a rocker arm 1, 2 rotatable about a rocker arm shaft 60. The rocker arm shaft 60 may be parallel to the rotatable shaft 111.

[0047] The linkage of the pivot bracket assembly 200 is compact. In addition, a compliance member 260 and a biasing member 280 may be included to ensure operation of the electromechanical actuator even if another part, such as the latch pin 30, is stuck in its position or fails to latch or unlatch in its switching window. The compliance member 260 and the biasing member 280 also allow for preloading of the latch pin 30 so that the timing of the rotating coupling 110 may not be perfect. The cam 113 may then load the pivot bracket assembly 200 and the compliance member 260 may store the actuation force AF until the latching device is configured to move the latch pin 30. For example, if the rocker arm 1, 2 is still in lift ( Figure 2C ), the compliant member can store the actuation force AF until the latch pin system 50 is aligned for actuation ( Figure 2A ), and the compliant member may then release the stored actuation force to move the latch pin system 50 ( Figure 2B ). In contrast, the buffer spring 33 and the biasing member 280 may be preloaded with a reaction force CF.

[0048] The pivot bracket assembly 200 is capable of converting the rotational motion of the cam 113 on the rotatable shaft 111 into axial motion of the latch pin system 50. Once the actuator assembly 100 is activated, the rotating coupling 110 rotates the rotatable shaft 111. As a design choice, this can be, for example, up to 75 degrees or can be a full rotation. The cam 113 mounted on the rotatable shaft 111 then pushes the first bracket 240 pivoted on the pivot pin 230 and pushes the second bracket 250 via the compliance member 260. The compliance member 260 can be a torsion element between the first bracket 240 and the second bracket 250 to ensure that the two brackets rotate around the pivot pin 230, thereby transferring the load / motion to the latch pin 30.

[0049] Other implementations will be apparent to those skilled in the art from consideration of the specification and practice of the examples disclosed herein.

Claims

1. A pivot bracket assembly for a valve train, comprising: pivot pin; a first bracket including a first mounting area rotatable about the pivot pin and a first reaction arm extending away from the first mounting area; a second bracket including a second mounting area rotatable about the pivot pin and a second reaction arm extending away from the first mounting area; A compliant member, the compliant member comprising: a receiving leg biased against the first bracket; and a transfer leg biased against the second bracket; and A biasing member, the biasing member comprising: a first leg biased against the second bracket; and a second leg configured to mount the biasing member relative to the pivot pin, Wherein the biasing member is configured to resist a biasing force from the compliant member.

2. The pivot bracket assembly of claim 1 further comprising a first mounting plate on the first end of the pivot pin and a second mounting plate on the second end of the pivot pin.

3. The pivot bracket assembly of claim 2, wherein the second leg is mounted against the second mounting plate.

4. The pivot bracket assembly of claim 2, wherein the second reaction arm includes a locating tab, and wherein the locating tab abuts the second mounting plate.

5. The pivot bracket assembly of claim 2, wherein the first mounting plate includes a first mounting location adjacent to a second mounting location of the second mounting plate.

6. The pivot bracket assembly of claim 1 wherein the pivot pin includes a diameter variation.

7. The pivot bracket assembly of claim 1 further comprising a bushing seated on the pivot pin, the bushing abutting the compliant member.

8. The pivot bracket assembly of claim 7, wherein the bushing surrounds a portion of the pivot pin, and wherein the second bracket is mounted to the bushing.

9. A pivoting bracket assembly according to claim 7 or claim 8, wherein the biasing member is a torsion spring coiled around the bushing.

10. The pivot bracket assembly of claim 1 wherein the compliant member is a torsion spring coiled around the pivot pin.

11. The pivot bracket assembly of claim 1 , wherein the receiving leg is biased against the first reaction arm, and wherein the transfer leg is biased against the second reaction arm.

12. The pivot bracket assembly of claim 1, wherein the first leg is biased against the second reaction arm.

13. An actuator assembly comprising the pivot bracket assembly according to any one of claims 1 to 10, the actuator assembly further comprising: a rotatable axis perpendicular to the pivot pin; and A cam lobe is mounted to the rotatable shaft, the cam lobe being configured to rotate against the first reaction arm.

14. A valve mechanism comprising an actuator assembly according to claim 13, the valve mechanism also comprising a latch device, the latch device comprising a latch pin protruding toward the second reaction arm, the second reaction arm being configured to actuate the latch device according to the cam profile of the cam lobe when the rotatable shaft rotates.

15. The valve train of claim 14, wherein the latch pin actuates in an axial direction parallel to a major axis of the rotatable shaft.

16. The valve train of claim 14, wherein the latch device is a rocker arm rotatable about a rocker arm shaft, and wherein the rocker arm shaft is parallel to the rotatable shaft.

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