The present disclosure relates to a camshaft phaser, in particular a camshaft phaser with a bushing arranged to hold a check valve plate in position with respect to a locking plate.
For fluid pressure in space 218 greater than fluid pressure in chamber 216, fluid in space 218 is arranged to displace flap 220 of plate 210 in axial direction AD1 so that through-bore 222 in plate 208, which is open to space 218, is open to chamber 216. Thus, fluid from space 218 flows to chamber 216 through through-bore 222. For fluid pressure in chamber 216 greater than fluid pressure in space 218, fluid in chamber 216 is arranged to displace flap 220 in axial direction AD2, opposite direction AD1, so that through-bore 222 is blocked by flap 220. Thus, fluid cannot flow from chamber 216 to space 218 through bore 222.
During assembly of phaser 200, plates 208 and 210 are placed together in a desired orientation (for example so that flaps 220 cover through-bores 222). Plates 208 and 210 must remain in this orientation during the remaining assembly steps for phaser 200, for example, the fastening of cover plate 224, plate 210 and plate 208 together. However, as shown in
According to aspects illustrated herein, there is provided a camshaft phaser, including: an axis of rotation; a stator including a radially outermost surface with a plurality of teeth; a locking plate including a first side facing in a first axial direction, a bore in the first side, and a through-bore; a check valve plate axially located between the locking plate and the stator and including a through-bore and a displaceable valve flap aligned, in the first axial direction, with the through-bore for the locking plate; and a bushing disposed in the bore in the first side and in the through-bore for the check valve plate. The bushing extends past the locking plate in the first axial direction.
According to aspects illustrated herein, there is provided a camshaft phaser, including: an axis of rotation; a stator including a radially outermost surface with a plurality of teeth; a locking plate including a first side facing in a first axial direction, a bore in the first side, and a through-bore; a check valve plate axially located between the locking plate and the stator and including a through-bore and a displaceable valve flap aligned, in the first axial direction, with the through-bore for the locking plate; and a bushing. The bushing includes a longitudinal axis extending in the first axial direction and is disposed in the bore in the first side and in the through-bore for the check valve plate. The bushing blocks movement of the check valve plate, with respect to the locking plate, in a radial direction with respect to the longitudinal axis or in a circumferential direction with respect to the longitudinal axis.
According to aspects illustrated herein, there is provided a method of operating a camshaft phaser including an axis of rotation, a stator, a rotor, a locking plate, a check valve plate axially located between the locking plate and the stator, a chamber formed at least in part by the stator, the rotor and the check valve plate, and a bushing disposed in a bore in the locking plate and in a through-bore in the check valve plate, the method including: blocking a through-bore in the locking plate with a flap in the check valve plate; displacing, in a first axial direction parallel to the axis of rotation, the flap in the check valve plate; flowing fluid through the through-bore to the chamber; displacing, in a second axial direction opposite the first axial direction, the flap in the check valve plate; blocking, with the flap, flow of the fluid from the chamber through the through-bore; and blocking, with a bushing disposed in the locking plate and in the check valve plate, movement of the check valve plate with respect to the locking plate in a radial or circumferential direction as referenced by 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.
To clarify the spatial terminology, objects 12, 13, and 14 are used. An axial surface, such as surface 15 of object 12, is formed by a plane co-planar with axis 11. Axis 11 passes through planar surface 15; however any planar surface co-planar with axis 11 is an axial surface. A radial surface, such as surface 16 of object 13, is formed by a plane orthogonal to axis 11 and co-planar with a radius, for example, radius 17. Radius 17 passes through planar surface 16; however any planar surface co-planar with radius 17 is a radial surface. Surface 18 of object 14 forms a circumferential, or cylindrical, surface. For example, circumference 19 is passes through surface 18. As a further example, axial movement is parallel to axis 11, radial movement is orthogonal to axis 11, and circumferential movement is parallel to circumference 19. Rotational movement is with respect to axis 11. The adverbs “axially,” “radially,” and “circumferentially” refer to orientations parallel to axis 11, radius 17, and circumference 19, respectively. For example, an axially disposed surface or edge extends in direction AD, a radially disposed surface or edge extends in direction R, and a circumferentially disposed surface or edge extends in direction CD.
For fluid pressure in space 140 greater than fluid pressure in a particular chamber 134, fluid F1 in space 140 is arranged to displace the flap 124 associated with the particular chamber 136 in axial direction AD1 so that the through-bore 118 associated with the particular chamber 136 is open to the chamber 136. Thus, fluid F1 flows from space 140 to the particular chamber 136. For fluid pressure in a particular chamber 136 greater than fluid pressure in space 140, fluid F2 in the particular chamber 136 is arranged to displace the flap 124 associated with the particular chamber 136 in axial direction AD2 so that the through-bore 118 associated with the particular chamber 136 is blocked by the flap 124 associated with the particular chamber 136. Thus, fluid F2 cannot flow to space 140 through the bore 118 associated with the particular chamber 136.
In an example embodiment, rotor 134 includes through-bore 152 and phaser 100 includes locking assembly 154 in through-bore 152. Assembly 154 includes locking pin 156, cartridge 157 and spring 158. Bushing 112 includes indentation 160 facing axial direction AD1. Spring 158 is arranged to displace locking pin 156 in direction AD2 into indentation 160 to non-rotatably connect rotor 134 and stator 102. By non-rotatably connected elements, we mean that: the elements are connected so that whenever one of the elements rotates at a particular speed, all of the elements rotate at the particular speed; and relative rotation between the elements is not possible. Assembly 154 locks rotor 134 into a predetermined rotational position with respect to stator 102. To lock rotor 134 and stator 102 together, pressurized fluid flows through channel 161.
In an example embodiment, phaser 100 includes cover plate 162, fasteners 164 and spiral spring 166 in space 140. Fasteners 164 non-rotatably connect cover plate 162, stator 102, check valve plate 110 and locking plate 108. For example, fasteners 164 pass through through-bores 168 in stator 102 and through-bores 170 in plate 110 and are threaded into threaded bores 172 in plate 108.
The following should be viewed in light of
In an example embodiment, blocking, with the bushing disposed in the locking plate and in the check valve plate, movement of the check valve plate with respect to the locking plate in a radial or circumferential direction as referenced by the axis of rotation includes blocking, with the bushing disposed in the locking plate and in the check valve plate, movement of the check valve plate with respect to the locking plate in the radial direction and in the circumferential direction as referenced by the axis of rotation.
In an example embodiment, a seventh step blocks, with the bushing, movement of the check valve plate, with respect to the locking plate, in a circumferential direction as referenced by a longitudinal axis extending through the bushing in an axial direction parallel to the axis of rotation. By “as referenced by the longitudinal axis” we mean the longitudinal axis is the point of references for the radial and circumferential directions.
In an example embodiment: displacing, in a first axial direction parallel to the axis of rotation, the flap in the check valve plate includes fluid pressure in a space formed at least in part by a spring cover fixed to the locking plate and the locking plate being greater than fluid pressure in the chamber; flowing fluid through the through-bore to the chamber includes flowing fluid from the space; and displacing, in the second axial direction, the flap in the check valve plate includes fluid pressure in chamber being greater than fluid pressure in the space.
In an example embodiment, an eighth step displaces a pin, disposed in part in the rotor, into an indentation in the bushing, and a ninth step non-rotatably connects the stator and the rotor.
Advantageously, camshaft phaser 100 and the method described above solve the problem noted above with respect to fixing a position of plate 110 during assembly of phaser 100. For example, bushing 112 as shown in
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.
Number | Name | Date | Kind |
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6705260 | Lewis et al. | Mar 2004 | B2 |
20160169060 | Fischer | Jun 2016 | A1 |
Number | Date | Country |
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1357263 | Oct 2003 | EP |
Number | Date | Country | |
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20180106167 A1 | Apr 2018 | US |