This disclosure is generally related to a camshaft phaser assembly with dual hydraulic camshaft phasers and, more particularly, to a camshaft phaser assembly with target wheels axially bracketing the dual hydraulic camshaft phasers.
A camshaft phaser assembly with dual hydraulic camshaft phasers is known. A target wheel for one of the hydraulic camshaft phasers is axially disposed between portions of the dual hydraulic camshaft phasers, increasing the axial extent of the camshaft phaser assembly and complicating access to the target wheel and cam timing implemented using the target wheel.
According to aspects illustrated herein, there is provided a camshaft phaser assembly, including: an axis of rotation; a first hydraulic camshaft phaser including a first stator arranged to receive rotational torque and including a first plurality of radially inwardly extending protrusions, a first rotor including a first plurality of radially outwardly extending protrusions circumferentially interleaved with the first plurality of radially inwardly extending protrusions, and a first plurality of phaser chambers, each phaser chamber circumferentially bounded by a respective radially inwardly extending protrusion included in the first plurality of radially inwardly extending protrusions and a respective radially outwardly extending protrusion included in the first plurality of radially outwardly extending protrusions; a second hydraulic camshaft phaser; a cap; and a first fluid chamber bounded in part by the cap and in fluid communication with a first phaser chamber included in the first plurality of phaser chambers; and a first bolt arranged to non-rotatably connect the first rotor and the cap to a first camshaft.
According to aspects illustrated herein, there is provided a camshaft phaser assembly, including: an axis of rotation; a first hydraulic camshaft phaser including a first stator arranged to receive rotational torque and including a plurality of radially inwardly extending protrusions, a first rotor including a plurality of radially outwardly extending protrusions circumferentially interleaved with the plurality of radially inwardly extending protrusions, and a plurality of phaser chambers, each phaser chamber circumferentially bounded by a respective radially inwardly extending protrusion included in the plurality of radially inwardly extending protrusions and a respective radially outwardly extending protrusion included in the plurality of radially outwardly extending protrusions; a second hydraulic camshaft phaser including a second stator non-rotatably connected to the first stator, and a second rotor; a cap including a first through-bore; a first bolt arranged to non-rotatably connect the first rotor and the cap to a first camshaft; a first fluid chamber bounded in part by the cap, directly connected to the first through-bore, and in fluid communication with a first phaser chamber included in the plurality of phaser chambers; and a second fluid chamber bounded in part by the cap and in fluid communication with a second phaser chamber, circumferentially adjacent to the first phaser chamber, included in the plurality of phaser chambers.
According to aspects illustrated herein, there is provided a camshaft phaser assembly, including: an axis of rotation; a first hydraulic camshaft phaser including a first stator arranged to receive rotational torque and including a first plurality of radially inwardly extending protrusions, a first rotor including a first plurality of radially outwardly extending protrusions circumferentially interleaved with the plurality of radially inwardly extending protrusions, and a first plurality of phaser chambers circumferentially bounded by the first plurality of radially inwardly extending protrusions and the first plurality of radially outwardly extending protrusions; a second hydraulic camshaft phaser including a second stator arranged to receive the rotational torque and including a second plurality of radially inwardly extending protrusions, a second rotor including a second plurality of radially outwardly extending protrusions circumferentially interleaved with the second plurality of radially inwardly extending protrusions, and a second plurality of phaser chambers circumferentially bounded by the second plurality of radially inwardly extending protrusions and the second plurality of radially outwardly extending protrusions; a first target wheel non-rotatably connected to the first rotor and arranged to determine a circumferential position of the first rotor for use in rotating the first rotor with respect to the first stator; and a second target wheel non-rotatably connected to the second rotor and arranged to determine a circumferential position of the second rotor for use in rotating the second rotor with respect to the second stator. The first hydraulic camshaft phaser and the second hydraulic cam shaft phaser are located between the first target wheel and the second target wheel in an axial direction parallel to the axis of rotation.
Various embodiments are disclosed, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, in which:
At the outset, it should be appreciated that like drawing numbers on different drawing views identify identical, or functionally similar, structural elements of the disclosure. It is to be understood that the disclosure as claimed is not limited to the disclosed aspects.
Furthermore, it is understood that this disclosure is not limited to the particular methodology, materials and modifications described and as such may, of course, vary. It is also understood that the terminology used herein is for the purpose of describing particular aspects only, and is not intended to limit the scope of the present disclosure.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood to one of ordinary skill in the art to which this disclosure belongs. It should be understood that any methods, devices or materials similar or equivalent to those described herein can be used in the practice or testing of the disclosure.
Assembly 100 includes: cap 116; fluid chamber 118; fluid chamber 120; and bolt 122. Chamber 118 and chamber 120 are each bounded, at least in part, by cap 116. Chamber 120 is bounded at least in part by bolt 122. Chamber 118 is in fluid communication with phaser chambers 114A. Chamber 120 is in fluid communication chambers 114B. Bolt 122 is arranged to non-rotatably connect rotor 108 and camshaft CS1. By “fluid communication” between two components, we mean that a fluid flow path exists between and connects the two components.
Rotor 108 includes through-bores 124. Each through-bore 124 is in fluid communication with a respective chamber 114A. For example, each through-bore 124 includes end 126 open to the chamber 114A and end 128 open to chamber 118. Stated otherwise, each through-bore 124 directly connects chamber 118 and the respective chamber 114A. Rotor 108 includes through-bores 130. Each through-bore 130 is open to a respective chamber 114B. For example, each through-bore 130 includes end 132 open to the respective chamber 114B.
Cap 116 includes through-bores 134 open to chamber 120. For example, each through-bore 134 includes end 136 open to chamber 120. Chambers 114B, through-bores 130, through-bores 134, and chamber 120 are in fluid communication. For example: through-bores 134 directly connect chamber 120 and through-bores 130; and through-bores 130 directly connect chambers 114B and through-bores 134. Cap 116 includes surface 137 facing axis AR. Ends 136 are in surface 137. Surface 137 bounds a portion of fluid chamber 120.
Assembly 100 includes bolt 152 arranged to non-rotatably connect rotor 140 to camshaft CS2, concentric with camshaft CS1. In the example of
Assembly 100 includes channel 156 and channel 158. At least a portion of channel 156 is bounded by bolt 152 in radially outward direction RD1. At least a portion of channel 156 is arranged to be bounded in radially inward direction RD2, opposite direction RD1, by camshaft CS1. At least a portion of channel 158 is bounded by bolt 122 in direction RD2. At least a portion of channel 158 is arranged to be bounded in direction RD1 by camshaft CS1. Channel 156 is directly connected to chamber 118. Channel 158 is directly connected to chamber 120.
Circumferential positions of target wheels 160 and 164 are read or measured by sensors SN1 and SN2, respectively. Sensors SN1 and SN2 transmit data D1 and D2 regarding the circumferential positions of target wheels 160 and 164, respectively, to control unit CU. Control unit CU uses data D1 and D1 and input I from other components as needed to send control signal CS for operation of hydraulic system HS, which controls transmission of fluid F to and from phasers 102 and 104. For example, if input I calls for camshaft CS1 to be advanced or retarded, data D1 is used as feedback to identify the required position of rotor 108 for advancing or retarding camshaft CS1.
Target wheel 160 and target wheel 164 are located at opposite axial ends of assembly 100. For example, radial portion 170 of target wheel 160 is located past rotor 108 in axial direction AD1. Axial direction AD1 is from bolt 152 toward cap 116 and parallel to axis of rotation AR. For example, radial portion 172 of target wheel 164 is located past rotor 140 in axial direction AD2, opposite axial direction AD1. Thus, cam shaft phaser 102 and cam shaft phaser 104 are axially disposed between, or axially bracketed by, target wheel 160 and target wheel 164. Stated otherwise, cam shaft phaser 102 and cam shaft phaser 104 are located between target wheel 160 and target wheel 164 in axial direction AD1.
Journal bearing JB is arranged to non-rotatably connect to camshaft CS2 and rotor 140. In an example embodiment: bearing JB includes through-bores TB1 and through-bores TB2; camshaft CS2 includes through-bores TB3 and through-bores TB4; and camshaft CS1 includes through-bores TB5. Each through-bore TB3 connects a respective through-bore TB1 to channel 156. In an example embodiment (not shown), cam shaft CS2 does not include through-bores TB3 and through-bores TB1 open directly to channel 156. Through-bores TB4 and TB5 connect through-bores TB2 and channel 158.
Rotor 140 includes multiple through-bores 174 and multiple through-bores 176. Each through-bore 174 opens to a respective chamber 146B. Each through-bore 176 opens to a respective chamber 146A. In an example embodiment, bearing JB includes: through-bores TB6 arranged to connect to through-bores 174; and through-bores TB7 arranged to connect to through-bores 176.
Channel 156 and channel 158 are arranged to transmit fluid F, for example oil, to and from chambers 114A and 114B, respectively. As is known in the art: supplying fluid F to chambers 114A and draining fluid F from chambers 114B rotates rotor 108 in direction CD1 with respect to stator 106, advancing the timing of camshaft CS1; and supplying fluid F to chambers 114B and draining fluid F from chambers 114A rotates rotor 108 in direction CD2 with respect to stator 106, retarding the timing of camshaft CS2.
Though-bores 174 and through-bores 176 are arranged to transmit fluid F to and from chambers 146A and 146B, respectively. As is known in the art: supplying fluid F to chambers 146A and draining fluid F from chambers 146B rotates rotor 140 in direction CD1 with respect to stator 138, advancing the timing of camshaft CS2; and supplying fluid F to chambers 146B and draining fluid F from chambers 146A rotates rotor 140 in direction CD2 with respect to stator 138, retarding the timing of camshaft CS1.
In the example of
Assembly 100 is more axially compact than known dual hydraulic camshaft phaser configurations. By placing target wheels 160 and 164 at axial ends of assembly 100: locking cover 182 is usable to connect stators 106 and 138, enabling the reduction in the axial extent of assembly 100; and rotors 108 and 140 are more accessible for cam timing.
It will be appreciated that various of the above-disclosed and other features and functions, or alternatives thereof, may be desirably combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims.
This application claims the benefit under 35 U.S.C. § 119(e) of U.S. Provisional Patent Application No. 62/593,532, filed Dec. 1, 2017, which application is incorporated herein by reference in its entirety.
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Number | Date | Country | |
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20190170028 A1 | Jun 2019 | US |
Number | Date | Country | |
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62593532 | Dec 2017 | US |