Patent Application
20190153907
The present disclosure relates to a cam shaft phaser with a rotor arranged to receive rotational torque and a stator rotatable with respect to the rotor. In particular, a cam shaft is non-rotatably connected to the rotor and the stator provides rotational torque to another cam shaft phaser and cam shaft.
Known configurations for cam shaft phasers, in which a stator receives torque from an engine and the rotor is rotated with respect to the stator to phase a cam shaft connected to the rotor may not be desirable for certain power train configurations.
According to aspects illustrated herein, there is provided a cam shaft phaser, including: an axis of rotation; a rotor arranged to receive torque from an engine and including a plurality of radially outwardly extending protrusions; a stator including a plurality of radially inwardly extending protrusions; and a plurality of chambers. Each chamber is circumferentially bounded by first and second radially outwardly extending protrusions. A respective radially inwardly extending protrusion is located in each chamber.
According to aspects illustrated herein, there is provided a cam shaft phaser, including: an axis of rotation; a rotor including a plurality of radially outwardly extending protrusions and a plurality of slots; a stator including a plurality of axially extending protrusion, each axially extending protrusion disposed in a respective slot and a plurality of radially inwardly extending protrusions; and a plurality of chambers, each chamber circumferentially bounded by first and second radially inwardly extending protrusions. A respective radially inwardly extending protrusion is located in each chamber. A line, parallel to the axis of rotation, passes through a chamber and a slot.
According to aspects illustrated herein, there is provided a cam shaft phaser, including: an axis of rotation; a rotor including a plurality of radially outwardly extending protrusions and a plurality of slots, each slot including a planar radially innermost surface and a curved radially outermost surface; a stator including a plurality of axially extending protrusion, each axially extending protrusion disposed in a respective slot and a plurality of radially inwardly extending protrusions; and a plurality of chambers, each chamber circumferentially bounded by first and second radially outwardly extending protrusions. A respective radially inwardly extending protrusion is located in each chamber.
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.
To clarify the spatial terminology, objects 12, 13, and 14 are used. As an example, an axial surface, such as surface 15A of object 12, is formed by a plane co-planar with axis 11. However, any planar surface parallel to axis 11 is an axial surface. For example, surface 15B, parallel to axis 11 also is an axial surface. An axial edge is formed by an edge, such as edge 15C, parallel to axis 11. A radial surface, such as surface 16A of object 13, is formed by a plane orthogonal to axis 11 and co-planar with a radius, for example, radius 17A. A radial edge is co-linear with a radius of axis 11. For example, edge 16B is co-linear with radius 17B. Surface 18 of object 14 forms a circumferential, or cylindrical, surface. For example, circumference 19, defined by radius 20, passes through surface 18.
Axial movement is in axial direction AD1 or AD2. Radial movement is in radial direction RD1 or RD2. Circumferential, or rotational, movement is in circumferential direction CD1 or CD2. The adverbs “axially,” “radially,” and “circumferentially” refer to movement or orientation parallel to axis 11, orthogonal to axis 11, and about axis 11, respectively. For example, an axially disposed surface or edge extends in direction AD1, a radially disposed surface or edge extends in direction RD1, and a circumferentially disposed surface or edge extends in direction CD1.
As further described below, stator 104 is rotatable with respect to rotor 102 and rotor 102 is not rotatable with respect to stator 104. That is, rotor 102 is the relative ground for cam shaft phaser 100 and phasing is performed by rotating stator 104 with respect to rotor 102.
Rotor 102 includes slots 120. Slots 120 connect axial sides 122 and 124 of rotor 102, facing in axial directions AD1 and AD2, respectively. In an example embodiment, cam shaft phaser 100 includes sealing cover 126, locking cover 128 and fasteners 130. Fasteners 130 pass through: through-bores 132 in cover 126; through-bores 134 in protrusions 114; and slots 120. Fasteners 130 thread into threaded bores 136 in cover 128, and non-rotatably connect sealing cover 126, stator 104, and locking cover 128. Therefore, stator 104 and covers 126 and 128 are rotatable with respect to rotor 102. Rotor 102 and stator 104 are axially disposed between covers 126 and 128. In an example embodiment, stator 104 is axially disposed between sealing cover 126 and rotor 102; and rotor 102 is axially disposed stator 104 and locking cover 128. In an example embodiment (not shown), rotor 102 is axially disposed between sealing cover 126 and stator 104; and stator 104 is axially disposed rotor 102 and locking cover 128. By “non-rotatably connected” components, we mean that: the components are connected so that whenever one of the components rotates, all the components rotate; and relative rotation between the components is not possible. Radial and/or axial movement of non-rotatably connected components with respect to each other is possible, but not required.
Stator 104 includes axially extending protrusions 138. Each protrusion 138 extends in axial direction AD1 from a respective protrusion 114. For example, protrusion 138A extends from protrusion 114A in direction AD1. Through-bores 134 pass through axially extending protrusions 138. Each axially extending protrusion 138 is at least partially disposed in a respective slot 120. For example, protrusion 138A is partially disposed in slot 120A. Stator 104 is rotatable with respect to rotor 102 to circumferentially displace each axially extending protrusion 138 within the respective slot 120. In an example embodiment, each slot 120 includes planar radially innermost surface 139 and radially outermost surface 140 curved in circumferential direction CD1.
Line L1, in axial direction AD1, passes through radially inwardly extending protrusion 114B and slot 120B without passing through chamber 106B. Line L2, in axial direction AD1, passes through chamber 106B and slot 120B. Line L3, in axial direction AD1, passes through chamber 106B and stator 104 without passing through slot 120B. Line L4 passes through protrusion 138B and slot 120B without passing through chamber 106B.
In an example embodiment: protrusion 110A includes slot 146; cam shaft phaser 100 includes locking pin 148 and spring 150, each disposed in slot 146; cover 128 includes indentation 152; and rotor 102 includes channel 154 connecting chamber 106A and slot 146. In an example embodiment, cam shaft phaser 100 includes spring support 156. Spring 150 urges pin 148 in axial direction AD1. In a first position for pin 148, which is a locked mode for cam shaft phaser 100, spring 150 displaces pin 148 in direction AD1 and into indentation 152, non-rotatably connecting cover 128, rotor 102, stator 104 and cover 126. Non-rotatably connecting rotor 102 to cover 128 non-rotatably connects rotor 102 to stator 104 and cover 126.
The discussion that follows assumes an advance phase adjustment entails rotating stator 104 in circumferential direction CD1 with respect to rotor 102, and a retard phase adjustment entails rotating stator 104 in circumferential direction CD2 with respect to rotor 102. In the example of
To transition from the locked mode to an unlocked mode, in which stator 104 is rotatable with respect to rotor 102, fluid is supplied to chamber 158A by channel 144A. The fluid flows through channel 154 to slot 146 and displaces pin 148 in direction AD2, against the urging of spring 150, to disengage pin 148 from indentation 152.
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.
