CN112211691A

CN112211691A - Camshaft phaser assembly

Info

Publication number: CN112211691A
Application number: CN201910615292.2A
Authority: CN
Inventors: 阿里·贝拉克达; 格哈德·施蒂希
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Holding China Co Ltd
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2021-01-12

Abstract

The invention relates to a camshaft phaser assembly comprising a camshaft phaser (100); an oil connection part (800) formed by one axial end part of the camshaft (200); a center bolt (700), the center bolt (700) connecting the other axial side of the camshaft phaser (100) to the oil connection (800); a pressure coupling (400) mounted to the oil connection (800); and a control valve (300) disposed outside the camshaft phaser (100). A storage chamber (102) is formed between the front cover (140) and the housing (101), a first oil passage (A), a second oil passage (B), and a third oil passage (T) are provided in the pressure connection (400), and a first radial flow passage (A1), a second radial flow passage (B1), and a third radial flow passage (T1) are provided in the oil connection (800). A first axial flow passage (A2) and a second axial flow passage (B2) are also provided, and a center through hole (T2) is provided in the center bolt (700).

Description

Camshaft phaser assembly

Technical Field

The invention relates to a camshaft phaser assembly.

Background

In the related art, an engine valve timing system is a system for controlling the valve opening and closing time of an engine of an automobile, and optimizes the operating performance of the engine by controlling the valve opening and closing time. In particular, the combustion chambers of the engine can be opened and closed by valves operated by cams on respective camshafts. Also contained within the combustion chamber is a reciprocating piston, which drives a crankshaft. The rotational energy of the crankshaft is transmitted at its axial ends via a transmission mechanism to a camshaft phaser. The camshaft phaser is axially mounted to the camshaft, receives rotational energy from the transmission and outputs the rotational energy to the camshaft. Here, the camshaft phaser can change the phase of the camshaft relative to the crankshaft.

Camshaft phasers according to the prior art, which are normally hydraulically operated, are provided for this purpose with a central valve and a member cooperating with the central valve and forming a hydraulic circuit therein, are disclosed for example in patent application CN 103244225A.

Specifically, referring to fig. 1, the camshaft adjuster 4 (i.e., a camshaft phaser) includes a stator 20 and a rotor 22 housed within the stator 20, the rotor 22 being concentrically housed within the stator 20 and having vanes 26 extending from a hub 24 of the rotor. The rotor 22 is held concentrically on a central spindle 28 of a central valve 30, which is screwed into one of the camshafts 12 and in which a control piston 32 is accommodated in an axially movable manner, which can be moved axially into the central spindle 28 by a tappet, not shown, of a central magnet and can be pressed out of the central spindle 28 axially by a spring, not shown in detail. Depending on the position of the control piston 32 in the central spindle 28, a pressure chamber (corresponding to a working or oil chamber), not shown in detail, of the camshaft adjuster 4 is connected in a manner known per se to a pressure connection 34 or to a volume accumulator connection 36, via which hydraulic fluid can be pumped into the pressure chamber and also released from the pressure chamber, respectively. The stator 20 has an annular outer portion 38 from which segments, not shown in detail, project radially inward. The annular outer portion 38 is axially closed with a front cover 40 and a rear cover 42, wherein the covers 40, 42 are held on the annular outer portion 38 via screws 44. On the outer circumference of the annular outer part 38, teeth 46 are formed, into which a gear mechanism can engage. The central spindle 28 has a radial bore 48 as a volume accumulator connection 36, on which radial bore 48 an axial channel 50 through the rotor 22 rests. The channel 50 is arranged radially on a circumferential groove 52 of the rotor 22, which groove is directed radially inward of the central spindle 28, so that the central valve 30 does not have to be screwed into the camshaft 12 in a predetermined angular position. The channel 50 leads into a volume accumulator 54, which is delimited by the rotor 22 and the front cover 40. The volume accumulator 54 opens via a non-return valve 56 into a pressure chamber of the camshaft adjuster 4, wherein hydraulic fluid can flow only from the reservoir 54 to the pressure chamber, so that the pressure chamber can suck up the stored hydraulic fluid from the reservoir 54 in the event of a negative pressure. If the volume accumulator 54 overflows due to too much hydraulic fluid, the excess hydraulic fluid is discharged via the tank connection 58, for example, to an oil sump, not shown. The tank connection 58 is closer to the axis of rotation than the check valve 56, so that during operation of the camshaft adjuster hydraulic fluid first reaches the check valve 56 due to centrifugal forces before escaping via the tank connection 58. Furthermore, the pressure coupling 34 is directly connected with the reservoir coupling 36 via an axial groove 60 in the central screw 28. The axial groove 60 in the central spindle 28 is therefore a bypass, with which the flow of hydraulic fluid of the pressure connection 34 bypasses the pressure chamber of the camshaft adjuster. In particular, the flow of hydraulic fluid from the pressure coupling 34 directly to the reservoir coupling 36 can be controlled by the 2/2 directional valve 62, which is schematically shown in FIG. 1. Furthermore, a sleeve 64 is arranged axially on camshaft 12 and radially on axial groove 60 in central spindle 28, sleeve 64 preventing radial discharge of hydraulic fluid from axial groove 60.

However, the central valve has disadvantages in use due to its complex structure, the need for associated cooperating members, and the large space occupied.

Disclosure of Invention

To overcome the above-described deficiencies of the prior art, the present invention provides a novel camshaft phaser assembly that enables a more compact camshaft phaser configuration, saves space, and thereby simplifies the complexity and reduces the number of components of the camshaft phaser by eliminating the center valve in the camshaft phaser and locating a control valve in place of the center valve function elsewhere in the engine.

In order to achieve the above object, the present invention adopts the following technical means.

The present invention provides a camshaft phaser assembly, comprising:

the camshaft phaser comprises a stator and a rotor accommodated in the stator, wherein a first working chamber and a second working chamber are formed between the stator and the rotor, the two sides of the first working chamber and the second working chamber in the axial direction of the camshaft phaser are respectively sealed by a front cover and a rear cover, and a shell is arranged on one axial side of the camshaft phaser;

an oil connecting part formed by one axial end part of the camshaft;

a center bolt connecting the other axial side of the camshaft phaser with the oil connection,

in particular, a camshaft phaser assembly according to the present invention further comprises:

a pressure coupling mounted to the oil connection; and

a control valve disposed external to the camshaft phaser,

a storage chamber is configured between the front cover and the housing,

a first oil path, a second oil path and a third oil path are arranged in the pressure connection part, a first radial flow passage, a second radial flow passage and a third radial flow passage are arranged in the oil connection part, a first axial flow passage and a second axial flow passage are arranged at the rotor, the central bolt and the oil connection part, a central through hole is arranged in the central bolt,

the first radial flow passage is connected with the first oil passage and the first axial flow passage, the first axial flow passage is communicated with the first working cavity, the second radial flow passage is connected with the second oil passage and the second axial flow passage, the second axial flow passage is communicated with the second working cavity, the third radial flow passage is connected with the third oil passage and the central through hole, the central through hole is communicated with the storage cavity, and the storage cavity is used for being connected to an oil tank,

the control valve is provided with an oil supply inlet for supplying oil to the control valve, and a first control flow passage (a3), a second control flow passage, and a third control flow passage connected to the first oil passage, the second oil passage, and the third oil passage, respectively, so that the control valve can supply oil from the first oil passage to the first working chamber, from the second oil passage to the second working chamber, and from the third oil passage to the reservoir chamber.

In at least one embodiment, the camshaft phaser assembly further includes a locking bolt mounting the housing to an outer housing of the engine, the locking bolt being provided with a cavity opposite and in communication with the central through bore of the central bolt, the cavity being connected to the storage chamber.

In at least one embodiment, the housing is provided with an axial through-hole in a region thereof close to the locking bolt, and a gap is provided between the housing and the outer shell, which gap communicates with the storage chamber through the axial through-hole.

In at least one embodiment, an axial through hole is provided in the front cover, and an axial passage communicating with the axial through hole is provided in the rotor and the oil connection portion, and the axial passage communicates with the reservoir chamber through the axial through hole and guides the oil in the reservoir chamber to the oil tank.

In at least one embodiment, the first oil passage, the second oil passage, and the third oil passage are provided at adjacent circumferential positions of the oil connecting portion and are connected to corresponding first radial flow passages, second radial flow passages, and third radial flow passages in the oil connecting portion.

In at least one embodiment, at least two of the first oil passage, the second oil passage, and the third oil passage are provided at different circumferential positions of the oil connection portion and are connected to corresponding first radial flow passages, second radial flow passages, and third radial flow passages in the oil connection portion.

In at least one embodiment, the camshaft phaser assembly further includes an annular spacer sleeved radially outward of the center bolt, the first axial flow passage is formed between an outer circumferential surface of the center bolt and an inner circumferential surface of the annular spacer, and the second axial flow passage is formed between an outer circumferential surface of the annular spacer and inner circumferential surfaces of the rotor and the oil connection portion.

In at least one embodiment, the first axial flow passage is formed in the oil connection portion, and the second axial flow passage is formed between an outer circumferential surface of the center bolt and inner circumferential surfaces of the rotor and the oil connection portion.

In at least one embodiment, the third radial flow channel extends from the pressure connection obliquely with respect to the radial direction of the oil connection from the head of the central bolt toward the pressure connection until it enters the central through bore of the central bolt, which extends axially to one axial end of the central bolt.

In at least one embodiment, a seal is provided between the oil connection and a back cover of the camshaft phaser.

Drawings

Fig. 1 is a schematic sectional illustration of a camshaft adjuster according to the prior art.

Fig. 2A and 2B are schematic cross-sectional structural views of a camshaft phaser assembly according to a first embodiment of the present invention, fig. 2A being a camshaft phaser connected with a camshaft and fig. 2B being a control valve provided separately from the camshaft phaser.

Fig. 3A and 3B are schematic cross-sectional structural views of a camshaft phaser assembly according to a second embodiment of the present invention, fig. 3A being a camshaft phaser connected with a camshaft and fig. 3B being a control valve provided separately from the camshaft phaser.

Fig. 4A and 4B are similarly schematic cross-sectional structural views of a camshaft phaser assembly according to a third embodiment of the present invention.

Fig. 5A and 5B are similarly schematic cross-sectional structural views of a camshaft phaser assembly according to a fourth embodiment of the present invention.

Description of the reference numerals

4 camshaft adjuster 20 stator 22 rotor 24 hub 26 vane 28 central screw 30 central valve 32 control piston 34 pressure coupling 36 volume accumulator coupling 38 annular outer portion 40 front cover 42 rear cover 44 screw 46 teeth 48 radial bore 50 channel 52 circumferential groove 54 volume accumulator 56 check valve 58 tank coupling 60 axial groove 62 reversing valve 64 sleeve 64

100 camshaft phaser 101 housing 102 storage chamber 103 axial through hole 104 gap 120 stator 122 front cover 142 rear cover 146 meshing part 200 camshaft 300 control valve 310 cylinder 400 pressure coupling part 500 housing 600 lock bolt 700 center bolt 800 oil connection 900 sealing device a first oil passage B second oil passage T third oil passage OT oil tank a1 first radial flow passage a2 first axial flow passage A3 first control flow passage B1 second radial flow passage B2 second axial flow passage B3 second control flow passage T1 third radial flow passage T2 center through hole T3 third control flow passage P oil inlet X axial direction.

Detailed Description

The following description will be made in conjunction with the accompanying drawings. A camshaft phaser according to the present invention has a generally cylindrical shape, and as such, the axial, radial and circumferential directions of the present invention refer to the axial, radial and circumferential directions of the camshaft phaser, respectively, unless otherwise specified.

(first embodiment)

As shown in fig. 2A and 2B, a camshaft phaser assembly according to a first embodiment of the present invention includes a camshaft phaser 100 that is provided with and covered by a housing 101 on one axial side (left side in fig. 2A), and that is connected on the other axial side (right side in fig. 2A) to an oil connection 800 formed by one axial side (left side in fig. 2A) end of a camshaft 200. Similar to offset camshaft phasers of the prior art, the camshaft phaser 100 includes a stator 120 and a rotor 122 received within the stator 120, with a plurality of cavities formed between the stator 120 and the rotor 122 by their profiles as first and second working chambers (not shown), respectively, to enable control of the rotational motion of the rotor 122 by a fluid (e.g., oil) to enable adjustment of the camshaft phase by the camshaft phaser. The first and second working chambers are closed on both sides in the axial direction X of the camshaft phaser 100 by a front cover 140 and a rear cover 142, respectively, and a storage chamber 102 is formed between the front cover 140 and the housing 101, the storage chamber 102 being intended for connection to a tank OT.

The camshaft phaser assembly according to the first embodiment of the present invention includes a central bolt 700 that is particularly hollow to connect the other axial side (the right side in fig. 2A) of the camshaft phaser 100 with the oil connection 800 of the camshaft 200. In particular, a hollow center bolt 700 passes through the center of the camshaft phaser 100 in the axial direction X, and the rotor 122 is disposed about the center bolt 700.

A pressure connection portion 400 is installed on the oil connection portion 800, and a plurality of oil passages, i.e., a first oil passage a, a second oil passage B, and a third oil passage T are provided in the connection portion 400, wherein the first oil passage a and the second oil passage B represent oil passages ultimately leading to a first working chamber and a second working chamber in the camshaft phaser 100, respectively, and the third oil passage T represents an oil passage ultimately leading to an oil tank OT (not shown). In the drawing, double arrows near the marks a and B indicate that the flow directions of the first oil passage a and the second oil passage B are bidirectional, and a single arrow near the mark T indicates that the flow path of the third oil passage T is unidirectional. A first radial flow passage a1, a second radial flow passage B1, and a third radial flow passage T1 are provided in the oil connection portion 800 to be connected to the first oil passage a, the second oil passage B, and the third oil passage T in the pressure coupling portion 400, respectively, and a first axial flow passage a2 and a second axial flow passage B2 are provided at the rotor 122, the center bolt 700, and the oil connection portion 800, and a center through hole T2 is provided in the center bolt 700.

Specifically, the first radial flow passage a1 in the oil connection 800 has one end connected to the first oil passage a in the pressure coupling 400 and the other end connected to a first axial flow passage a2 in the oil connection 800, the first axial flow passage a2 extending axially as a whole and being connected to the first working chamber in the camshaft phaser 100 at the end opposite to the first radial flow passage a1, thereby achieving passage of the first oil passage a to the first working chamber. The second radial flow passage B1 in the oil connection portion 800 has one end connected to the second oil passage B in the pressure coupling portion 400 and the other end connected to a second axial flow passage B2 in the oil connection portion 800, the second axial flow passage B2 integrally extending axially and being connected to the second working chamber in the camshaft phaser 100 at an end opposite to the second radial flow passage B1, thereby achieving passage of the second oil passage B to the second working chamber. Thus, fluid (e.g., oil) used to operate the camshaft phaser 100 may enter the first and second working chambers of the camshaft phaser 100 via the aforementioned flow passages a1, a2, B1, B2 within the oil connection 800 through the first and second oil passages a, B, respectively, provided in the pressure coupling 400 to effect control of the camshaft phaser 100.

The third radial flow channel T1 in the oil connection 800 is connected at one end to the third oil channel T in the pressure connection 400 and at the other end to the central through bore T2 of the central bolt 700, the central through bore T2 extending axially up to the cavity of the locking bolt 600, whereby the flow path thus formed can further pass in the radially outward direction into the reservoir chamber 102 and then out of the camshaft phaser 100 and finally into the oil tank OT (not shown). The third oil passage T, the third radial flow passage T1, the central through hole T2, the cavity of the lock bolt 600, and the storage chamber 102 serve as a bypass circuit for the oil to assist in the circulation of the oil. By thus providing the storage chamber 102, the amount of engine oil required can be quickly satisfied when returning oil to the working chamber, thereby avoiding insufficient engine oil.

In particular, in this embodiment, the first oil passage a in the pressure connection 400 is connected to a first radial flow passage a1 extending radially in the oil connection 800, the first radial flow passage a1 extends to the depth of the outer wall of the center bolt 700 and is connected to a first axial flow passage a2 extending in the axial direction X against the outer wall of the center bolt 700 in the direction of the camshaft phaser 100, the first axial flow passage a2 extends until it reaches the inside of the camshaft phaser 100 and communicates with a first working chamber of the camshaft phaser 100, the direction of extension of the first radial flow passage a1 being perpendicular to the direction of extension of the first axial flow passage a 2. Similarly, the second oil passage B in the pressure connection 400 is connected to a second radial flow passage B1 extending radially in the oil connection 800, which second radial flow passage B1 extends radially up to the depth of the radial outer periphery of the first axial flow passage a2 and then is connected to a second axial flow passage B2 extending in the axial direction X against the outer periphery of the first axial flow passage a2, which second axial flow passage B2 extends up to the inside of the camshaft phaser 100 and communicates with the second working chamber of the camshaft phaser 100. The third oil passage T in the pressure connection 400 is connected to a third radial flow passage T1 in the oil connection 800, which third radial flow passage T1 extends in the sectional view obliquely (preferably approximately 45 degrees) to the radial direction from the pressure connection 400 in the direction of the head of the center bolt 700 until it enters the center through hole T2 of the center bolt 700.

It is understood that the first axial flow passage a2 and the second axial flow passage B2 may be formed near the outer circumferential surface of the center bolt 700 by, for example, sleeving an annular partition on the radially outer side of the center bolt 700. The annular spacer may be supported at both ends to the rotor 122 and the oil connection 800 of the camshaft phaser 100, respectively. At this time, the first axial flow passage a2 may be formed between the outer circumferential surface of the center bolt 700 and the inner circumferential surface of the annular partition, and the second axial flow passage B2 may be formed between the outer circumferential surface of the annular partition and the inner circumferential surface of the rotor 122 and the oil connection 800.

Preferably, as shown in fig. 2A, the camshaft phaser assembly according to the present invention further includes a locking bolt 600 that mounts the housing 101 to the housing 500 of the engine, the locking bolt 600 being provided with a cavity opposite to and in communication with the central through hole T2 of the central bolt 700, the cavity being connected to the storage chamber 102. An axial through hole 103 is provided in the housing 101 at a position close to the locking bolt 600, and a gap 104 is provided between the housing 101 and the outer case 500, the gap 104 communicating with the storage chamber 102 through the axial through hole 103. Thus, after leaving the reservoir 102, the bypass circuit of the oil leaves the camshaft phaser 100 via the axial through-hole 103 and the gap 104 and finally enters the oil tank OT.

The camshaft phaser assembly according to the present invention further includes a control valve 300 disposed separately from the camshaft phaser 100, the control valve 300 being, for example, a cartridge valve in the related art, the control valve 300 being supplied with oil from an oil supply inlet P in the axial direction, a first control flow passage a3, a second control flow passage B3 and a third control flow passage T3 connected to the first oil passage a, the second oil passage B and the third oil passage T of the pressure coupling portion 400, respectively, being provided in the cylinder 310 of the control valve 300. The control valve 300 may control the flow of fluid in the first control flow passage a3, the second control flow passage B3, and the third control flow passage T3. Thus, oil can be supplied from the control valve 300 to the first working chamber from the first oil passage a, to the second working chamber from the second oil passage B, and to the storage chamber 102 from the third oil passage T through the first oil passage a, the second oil passage B, and the third oil passage T in the pressure coupling 400.

In this embodiment, the first, second, and third oil passages a, B, T located in the pressure coupling 400 may be connected with the corresponding first, second, and third radial flow passages a1, B1, T1 in the oil connection 800 at adjacent circumferential positions of the oil connection 800.

(second embodiment)

As shown in fig. 3A and 3B, the structure of the camshaft phaser assembly according to the second embodiment of the present invention is substantially the same as that of the camshaft phaser assembly according to the first embodiment of the present invention, with structural differences including the manner in which the flow passages a1, a2, B1, B2, T1 are formed.

According to this embodiment, similarly to the first embodiment, the first oil passage a, the second oil passage B, and the third oil passage T in the pressure coupling portion 400 are connected to the corresponding first radial flow passage a1, the second radial flow passage B1, and the third radial flow passage T1 in the oil connection portion 800 at adjacent circumferential positions of the oil connection portion 800. Specifically, the second radial flow passage B1 connected to the second oil passage B extends radially within the oil connection 800 to the depth of the outer wall of the center bolt 700 and is connected to a second axial flow passage B2 extending in the axial direction X toward the camshaft phaser 100 against the outer wall of the center bolt 700, the second axial flow passage B2 extending until it reaches within the camshaft phaser 100 and communicates with the second working chamber of the camshaft phaser 100. The second axial flow passage B2 may be formed between the outer circumferential surface of the center bolt 700 and the inner circumferential surface of the rotor 122 and the oil connection portion 800. The first radial flow passage a1 connected to the first oil passage a extends radially as a bore in the oil connection 800 to a depth spaced a distance from the radial outer periphery of the second axial flow passage B2 and is connected to a first axial flow passage a2 extending in the axial direction X toward the camshaft phaser 100, the first axial flow passage a2 extending until it reaches the inside of the camshaft phaser 100 and communicates with the first working chamber of the camshaft phaser 100. Preferably, the radial hole of the first radial flow passage a1 is disposed diametrically opposite the radial hole of the second radial flow passage B1. Here, the second axial flow passage B2 may be formed to extend in the axial direction X in the oil connection 800 to an end of the oil connection 800 close to the camshaft phaser 100. The third radial flow passage T1 connected to the third oil passage T extends from the pressure coupling portion 400 toward the head of the center bolt 700 obliquely (preferably, approximately 10 degrees) with respect to the radial direction in the cross-sectional view until entering the center through hole T2 of the center bolt 700 within the oil connection 800. Here, the configuration of the control valve 300 may be the same as that of the first embodiment.

(third embodiment)

As shown in fig. 4A and 4B, the structure of the camshaft phaser assembly according to the third embodiment of the present invention is substantially the same as that of the camshaft phaser assembly according to the second embodiment of the present invention, with the structural differences therebetween including the on position of the first oil passage a in the pressure coupling 400 and the first radial flow passage a1 in the oil connection 800.

According to this embodiment, the second and third oil passages B, T in the pressure coupling 400 are connected to the second and third radial flow passages B1, T1 in the oil connection 800 at positions adjacent to the oil connection 800, respectively, and the first oil passage a in the pressure coupling 400 is connected to the first radial flow passage a1 in the oil connection 800 at a position of the oil connection 800 diametrically opposite to the above-described connection position. Here, the configuration of the control valve 300 may be the same as that of the first embodiment.

(fourth embodiment)

As shown in fig. 5A and 5B, a camshaft phaser assembly according to a fourth embodiment of the present invention is particularly useful for a dry belt drive, and has a structure substantially the same as that of the camshaft phaser assembly according to the third embodiment of the present invention, and the structural differences therebetween include a manner in which oil introduced from the third oil passage T flows behind the center bolt 700, and a seal device 900 provided for dry belt drive.

In addition, unlike the previous embodiment, the housing 101 of the camshaft phaser 100 according to this embodiment is not provided with the axial through hole 103, but rather an axial through hole 106 is provided in the front cover 140, which is the side facing the housing 101 across the reservoir chamber 102, and a through axial passage communicating with the axial through hole 106 is provided in the rotor 122 and the oil connection 800. Thus, the first radial flow channel T1 in the oil connection 800 extends in this sectional view obliquely (preferably approximately 10 degrees) with respect to the radial direction from the pressure connection 400 in the direction of the head of the central bolt 700 until it enters the central through opening T2 of the central bolt 700, which central through opening T2 opens axially along the central bolt 700 into the recess of the locking bolt 600, the flow path thus formed being able to re-enter the reservoir chamber 102 further in this radially outward direction and then leave the camshaft phaser 100 on the side of the oil connection 800 remote from the camshaft phaser 100 via the axial through opening 106 through the axial passage of the rotor 122 and the oil connection 800 and finally enter the oil tank OT. Here, the configuration of the control valve 300 may be the same as that of the first embodiment.

On the other hand, the camshaft phaser 100 engages a belt (not shown) through an engagement portion 146 disposed radially outward of the stator 120. As is known, oil or other fluid contacting the dry belt can cause slippage, and to this end, a sealing device 900, such as a sealing ring, is provided between the oil connection 800 and the rear cover 142 of the camshaft phaser 100. The sealing device 900 may prevent oil that may leak between the rotor 122 and the rear cover 142 from contacting the belt.

Although the specific embodiments of the present invention are described in detail in the above, it should be noted that:

1. although only the connection positions of the first oil passage a and the second oil passage B and the third oil passage T in the pressure coupling 400 and the corresponding flow passages in the oil connection 800 are illustrated to be different, it will be understood by those skilled in the art that the positions of the first oil passage a, the second oil passage B, and the third oil passage T into the oil connection 800 may be the same or different from each other.

2. In the camshaft phaser 100 and the oil connection 800 according to the present invention, the extension of the runners a1, a2, B1, B2, T1 may be varied according to actual needs, and is not limited to the extension shown in the above embodiments.

3. Although not specifically illustrated, it will be understood by those skilled in the art that the angle at which the third radial flow passage T1 in the oil connection 800 is inclined with respect to the radial direction from the pressure coupling portion 400 to the head of the center bolt 700 may be selected according to the implementation.

Claims

1. A camshaft phaser assembly comprising:

a camshaft phaser (100) comprising a stator (120) and a rotor (122) housed within the stator (120), a first working chamber and a second working chamber formed between the stator (120) and the rotor (122), both sides of the first working chamber and the second working chamber in an axial direction (X) of the camshaft phaser (100) being closed by a front cover (140) and a rear cover (142), respectively, the camshaft phaser (100) being provided with a housing (101) at one axial side;

an oil connection part (800) formed by one axial end part of the camshaft (200);

a center bolt (700), the center bolt (700) connecting the other axial side of the camshaft phaser (100) with the oil connection (800), characterized in that,

the camshaft phaser assembly further comprises:

a pressure coupling (400) mounted to the oil connection (800); and

a control valve (300) disposed outside of the camshaft phaser (100),

a storage chamber (102) is formed between the front cover (140) and the housing (101),

a first oil passage (A), a second oil passage (B) and a third oil passage (T) are arranged in the pressure connection part (400), a first radial flow passage (A1), a second radial flow passage (B1) and a third radial flow passage (T1) are arranged in the oil connection part (800), a first axial flow passage (A2) and a second axial flow passage (B2) are arranged at the rotor (122), the central bolt (700) and the oil connection part (800), a central through hole (T2) is arranged in the central bolt (700),

the first radial flow passage (A1) connects the first oil passage (A) and the first axial flow passage (A2), the first axial flow passage (A2) communicates with the first working chamber, the second radial flow passage (B1) connects the second oil passage (B) and the second axial flow passage (B2), the second axial flow passage (B2) communicates with the second working chamber, the third radial flow passage (T1) connects the third oil passage (T) and the central through hole (T2), the central through hole (T2) communicates with the storage chamber (102), and the storage chamber (102) is used for connecting to an Oil Tank (OT),

the control valve (300) is provided with an oil supply inlet (P) for supplying oil to the control valve (300), and a first control flow passage (A3), a second control flow passage (B3), and a third control flow passage (T3) connected to the first oil passage (A), the second oil passage (B), and the third oil passage (T), respectively, so that the control valve (300) can supply oil from the first oil passage (A) to the first working chamber, from the second oil passage (B) to the second working chamber, and from the third oil passage (T) to the reservoir chamber (102).

2. A camshaft phaser assembly as in claim 1 further comprising a locking bolt (600) mounting said housing (101) to an outer housing (500) of an engine, said locking bolt (600) being provided with a cavity opposite and communicating with a central through bore (T2) of said central bolt (700), said cavity being connected to said storage chamber (102).

3. A camshaft phaser assembly as in claim 2, characterized in that the housing (101) is provided with an axial through hole (103) in the region close to the locking bolt (600) and a gap (104) is provided between the housing (101) and the housing (500), which gap (104) communicates with the storage chamber (102) through the axial through hole (103).

4. A camshaft phaser assembly as in claim 1 wherein an axial through bore (106) is provided in the front cover (140), an axial passage communicating with said axial through bore (106) is provided in the rotor (122) and in the oil connection (800), said axial passage communicating with the reservoir chamber (102) through said axial through bore (106) and serving to conduct oil in the reservoir chamber (102) out to the Oil Tank (OT).

5. A camshaft phaser assembly as in any of claims 1-4, wherein the first, second and third oil passages (A, B, T) are provided at adjacent circumferential locations of the oil connection (800) and connect with corresponding first, second and third radial flow passages (A1, B1, T1) in the oil connection (800).

6. A camshaft phaser assembly as in any of claims 1-4, wherein at least two of said first, second and third oil passages (A, B, T) are provided at different circumferential positions of the oil connection (800) and are connected with corresponding first, second and third radial flow passages (A1, B1, T1) in the oil connection (800).

7. A camshaft phaser assembly as in any of claims 1-4, further comprising an annular spacer sleeved radially outward of said center bolt (700), said first axial flow passage (A2) being formed between an outer circumferential surface of said center bolt (700) and an inner circumferential surface of said annular spacer, said second axial flow passage (B2) being formed between an outer circumferential surface of said annular spacer and an inner circumferential surface of said rotor (122) and an inner circumferential surface of said oil connection (800).

8. A camshaft phaser assembly as in any of claims 1-4, wherein the first axial flow passage A2 is formed in the oil connection (800) and the second axial flow passage B2 is formed between the outer circumferential surface of the center bolt (700) and the inner circumferential surface of the rotor (122) and the inner circumferential surface of the oil connection (800).

9. A camshaft phaser assembly as in any of claims 1-4, characterized in that the third radial flow passage (T1) extends from the pressure coupling (400) towards the head of the center bolt (700) obliquely with respect to the radial direction of the oil connection (800) until entering the central through hole (T2) of the center bolt (700), the central through hole (T2) of the center bolt (700) extending axially to one axial end of the center bolt (700).

10. A camshaft phaser assembly as in any of claims 1-4, wherein a sealing device (900) is provided between the oil connection (800) and the rear cover (142) of the camshaft phaser (100).