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1. (WO2019029788) VALVE ASSEMBLY FOR CONTROLLING A CAMSHAFT TIMING APPARATUS
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A valve assembly (120) for controlling an apparatus for camshaft timing adjustment being driven by a hydraulic pump (100), comprising a valve body (135) with a first control port (133), a second control port (134), a high pressure port and a low pressure port, the valve assembly (120) having

- a first state for enabling a flow of a hydraulic fluid from the high pressure port to the first control port (133) and from the second control port (134) to the low pressure port, respectively, and

- a second state for enabling a flow of the hydraulic fluid from the high pressure port to the second control port (134) and from the first control port (133) to the low pressure port, respectively,

characterized in that

the valve body (135) comprises a central actuating through-hole (132) extending axially through the valve body (135) defining an axial direction (136), the first and second control ports (133, 134) are arranged on axially opposite sides of the valve body (135) and are connected to each other by the central actuating through-hole (132), and in that

the valve assembly (120) comprises a valve actuating means (140) having a pin-like valve needle with an actuating section (141) being arranged central and axially displaceable in the actuating through-hole (132) of the valve body (135), the valve actuating means (140) being in a first axial position in the first state of the valve assembly (120) and in a different second axial position in the second state of the valve assembly (120).

The valve assembly according to claim 1,

characterized in that

the valve body (135) comprises a high pressure channel (122) extending from the high pressure port for fluidly connecting the high pressure port (121) to the hydraulic pump (100) and a low pressure channel (124) extending from the low pressure port for fluidly connecting the low pressure port to the hydraulic pump (100).

The valve assembly according to claim 2,

characterized in that

the high pressure port is configured as a first internal valve chamber (121) of the valve body (135) and the low pressure port is configured as a second internal valve chamber (123) of the valve body (135) wherein the first and second internal valve chambers (121, 123) are juxtaposed in the axial direction (136).

The valve assembly according to claim 3,

characterized in that

the first internal valve chamber (121) has an elongate section extending radially wherein the associated high pressure channel (122) opens into an end region of the elongate section and/or the second internal valve chamber (123) has an elongate section extending radially wherein the associated low pressure channel (124) opens into an end region of the elongate section.

The valve assembly according to claim 4,

characterized in that

the first internal valve chamber (121) has a plurality of elongate sections each associated with a high pressure channel (122) and the second internal valve chamber (123) has a plurality of elongate sections each associated with a low pressure channel (124).

The valve assembly according to claim 5,

characterized in that

the first internal valve chamber (121) has exactly two elongate sections being arranged collinear and the associated high pressure channels (122) open into radially opposite end regions of the elongate sections and/or the second internal valve chamber (123) has exactly two elongate sections being arranged collinear and the associated low pressure channels (124) open into radially opposite end regions of the elongate sections.

The valve assembly according to claim 6,

characterized in that

the elongate sections of the first internal valve chamber (121) and the elongate sections of the second internal valve chamber (123) extend parallel, wherein particularly the high pressure channels (122) and the low pressure channels (124) open from opposite sides into the elongate sections of the associated internal first and second internal valve chambers (121, 123), respectively.

The valve assembly according to one of claims 2 to 7,

characterized in that

the valve assembly comprises two high pressure ports and to low pressure ports, wherein the internal valve chambers (121, 123) are arranged in a first pair (125) and a second pair (126) each comprising a first internal valve chamber (121) and a second internal valve chamber (123) being separated by a separation wall (127), wherein the first and second pairs (125, 126) are juxtaposed in the axial direction (136) and wherein the axial sequence of the first and second internal valve chambers (121, 123) is different between the pairs (125, 126).

The valve assembly according to claim 8,

characterized in that

the valve body (135) comprises a first annular channel (128) surrounding the first pair (125) and a second annular channel (129) surrounding the second pair (126) of internal valve chambers (121, 123), each having two axial channel sections (130), and two radial channel sections (131) connecting corresponding axial ends of the axial channel sections (130) wherein particularly each outer axial channel section (130) is configured as a groove extending in the corresponding axial surface (116) of the valve body (135), the grooves being the first and second control ports (133, 134), respectively.

The valve assembly according to claim 9,

characterized in that

the central actuating through-hole (132) is fluidly connected with the first internal valve chambers (121), the second internal valve chambers (123) and the radial channel sections (131) of the first and second annular channels (128, 129).

The valve assembly according to claim 10,

characterized in that

the actuating section (141) comprises a plurality of annular protrusions (142) being juxtaposed in the axial direction and defining axial clearances (143) between each other, the annular protrusions (142) being arranged and configured to selectively and exclusively open in the first axial position of the valve actuating means (140) fluid connections between the first internal valve chamber (121) of the first pair (125) and the first annular channel (128) as well as the second internal valve chamber (123) of the second pair (126) and the second annular channel (129), respectively, and in

the second axial position of the valve actuating means (140) fluid connections between the first internal valve chamber (121) of the second pair (126) and the second annular channel (129) as well as the second internal valve chamber (123) of the first pair (125) and the first annular channel (128), respectively.

The valve assembly according to claim 11,

characterized in that

the valve assembly (120) has a third state for enabling a flow of the hydraulic fluid from the first internal valve chambers (121) to the second internal valve chambers (123) and fluidly separating the first control port (133) and the second control port (134) from the internal valve chambers (121, 123), wherein in the third state of the valve assembly (120) the valve actuating means (140) is in a third axial position different from the first and second positions opening a connection between the first internal valve chambers (121) and the second internal valve chambers (123) while closing the first and second annular channels (128, 129).

A hydraulic pump (100) having a valve assembly (120) according to one of the preceding claims,

characterized in that

the valve assembly (120) is arranged within the hydraulic pump (100).

The hydraulic pump according to claim 13,

characterized in that

the hydraulic pump (100) has a stator (104), a rotor (105) defining a common rotational axis (2) extending in the axial direction (136), at least one low pressure pump chamber (102) and at least one high pressure pump chamber (103) wherein a high pressure channel (124) opens into each high pressure pump chamber (103) and a low pressure channel (122) opens into the each low pressure pump chamber (102).

The hydraulic pump according to claim 14,

characterized in that

the hydraulic pump (100) comprises a pumping means (103) for pumping the hydraulic fluid from the at least one low pressure pump chamber (102) to the at least one high pressure pump chamber (101), wherein the pumping means (103) is supported by the stator (104) or the rotor (105) and configured for pumping the hydraulic fluid from the at least one low pressure pump chamber (102) to the at least one high pressure pump chamber (101) due to a rotation of the rotor (105) relative to the stator (104) about the common rotational axis (2).

The hydraulic pump according to claim 15,

characterized in that

the stator (104) comprises an internal gear (106) and the rotor (105) comprises a rotor body (110) disposed within the internal gear (106), the rotor body (110) integrally comprising the valve body (135) and being supported rotationally about the common rotational axis (2) such that the teeth (107) of the internal gear (106) and peripheral surface sections (111) of the rotor body (110) abut to form a radial bearing.

The hydraulic pump according to claim 16,

characterized in that

the pumping means (103) is a gear wheel being supported by the rotor body (110) and/or engaged with the internal gear (106) and having a rotational axis (115) parallel to the common rotational axis (2).

The hydraulic pump according to one of claims 16 or 17,

characterized in that

the rotor body (110) comprises two separating arms (112) and two pumping arms (113) extending in a radial direction and alternating in a circumferential direction and separating from each other two high pressure pump chambers (101) and two low pressure pump chambers (102) alternating in a circumferential direction, the two pumping arms (113) each supporting a bearing pin (114) rotationally supporting a pumping means (103) and defining a fluid passage between a high pressure pump chamber (101) and an adjacent low pressure pump chamber (102) wherein the separating arms (112) integrally comprise the valve body (135) and particularly the elongate sections of the first and second internal valve chambers (121, 123) are arranged in the separating arms (112), the axial channel sections (130) of the annular channels (128, 129) being disposed spaced apart in the separating arms (112).

An apparatus (1) for camshaft timing adjustment, comprising:

- a drive disc (10) and a hub (50) rotationally supported relative to each other wherein the hub (50) is arranged within the drive disc (10) or vice versa,

- a vane (57) being accommodated in an adjusting chamber (30) defined by the drive disc (10) and/or the hub (50) and separating the adjusting chamber (30) into a first sub-chamber (31) and a second sub-chamber (32), wherein the vane (57) is attached to the hub (50) or the drive disc (10),

characterized in that

a hydraulic pump (100) according to one of claims 13 to 18 is arranged within the hub (50) wherein the first control port (133) is fluidly connected to the first sub-chamber (31) and the second control port (134) is fluidly connected to the second sub-chamber (32).

20. The apparatus according to claim 19,

characterized in that

the drive disc (10) has a casing (20) accommodating the hub (50), the casing (20) comprising a casing wall (21) and a casing lid (22) axially closing the casing (20).

21. The apparatus according to claim 20,

characterized in that

the drive disc (10) comprises a plurality of separation means (33) configured as protrusions extending radially inward from the casing wall (21) and separating a plurality of adjusting chambers (30) from each other in a circumferential direction, and a plurality of vanes (57) each being attached to the hub (50) and extending radially outward from the hub (50) into an asso- ciated adjusting chamber (30).

22. The apparatus according to claim 21,

characterized in that

exactly two vanes (57) and two adjusting chambers (30) are provided, particularly disposed on opposite sides of the common rotational axis (2), re- spectively.

23. The apparatus according to one of claims 19 to 22,

characterized in that

the first sub-chambers (31) and the second sub-chambers (32) alternate in a circumferential direction.

The apparatus according to one of claims 19 to 23,

characterized in that

the hub (50) defines a central through-hole (51) accommodating the hydraulic pump (100).

The apparatus according to claim 24,

characterized in that

the hub (50) comprises a first hub lid (52) and a second hub lid (53) axially closing the through-hole (51) on opposite sides of the hub (50), the second hub lid (53) comprising a coupling means (56) configured to provide a torque-proof connection with a camshaft wherein the coupling means (56) and/or the camshaft extends through a central camshaft through-hole (12) of the drive disc (10).

The apparatus according to claim 25,

characterized in that

the hub (50) comprises two first adjusting channels (92) being configured as grooves in a first axial surface (90) of the hub (50) each extending radially outward from a central through-hole (54) of the first hub lid (52) to a vane (57) and each bending into a first peripheral direction to open into a first sub-chamber (31), and two second adjusting channels (93) being configured as grooves in a second axial surface (91) of the hub (50) each extending radially outward from a central through-hole (55) of the second hub lid (53) to a vane (57) and each bending into a second peripheral direction to open into a second sub-chamber (32) wherein the first and second adjusting channels (92, 93) have straight sections (94) formed in the first and second hub lids (52, 53), respectively.

27. The apparatus according to claim 26,

characterized in that

the stator (104) of the hydraulic pump (100) is integral with and/or torque- proof connected to the hub (50) and/or the pumping means (103) is supported by the rotor (105).

28. The apparatus according to claim 27,

characterized in that

the valve actuating means (140) has an operating section (144) extending through the central through-hole (54) of the first hub lid (52), and a head (145) at its outer free end.

29. The apparatus according to one of claims 19 to 28,

characterized in that

the apparatus comprises a torque transmission means (60) extending through a central torque transmitting trough-hole (34) of the casing lid (22) and being torque-proof connected to the rotor (105) for establishing a relative rotation between the rotor (105) and the stator (104).

30. The apparatus according to claim 29,

characterized in that

the torque transmission means (60) defines a central operating through- hole (63) extending axially which is penetrated by the operating section (144) of the valve actuating means (140).

31. The apparatus according to claim 30,

characterized in that

the torque transmission means (60) extends through the central torque transmitting through-hole (34) of the casing lid (22) and the central through-hole (54) of the first hub lid (52), wherein the torque transmission means (60) has a coupling means (62) disposed at an outer end and a connecting means (61) disposed at an opposite inner end, the connecting

means (61) being configured to establish the torque-proof connection between the torque transmission means (60) and the rotor body (110).

The apparatus according to claim 31,

characterized in that

the connecting means (61) is configured as a pin-like protrusion being disposed eccentrically and extending axially from the inner free end, and that the rotor body (110) comprises a complementary recess (117) formed in the axial surface (116) and being engaged by the connecting means (61).

33. The apparatus according to claim 32,

characterized in that

the connecting means (61) is configured as a plurality of protrusions being disposed around the operating through-hole (63), particularly two protrusions disposed on opposite sides of the operating through-hole (63), the rotor body (110) comprising corresponding recesses (117).

The apparatus according one of claims 30 to 33,

characterized in that

the coupling means (60) is configured as a hexagonal head.