Automotive swing-block pump

Abstract

The present invention relates to an automotive pendulum-slider pump (10, 10') for providing pressurized lubricant. The automotive pendulum-slider pump (10, 10') includes a non-rotatable rotor housing (12); a rotatable rotor ring (20, 20') that rotates within the rotor housing (12) and surrounds a pumping chamber (25) having an intake opening (18) and an exhaust opening (19); a rotatable rotor hub (35) that is rotatably connected to the rotor ring (20, 20'); and a plurality of pendulum blades (30) arranged at equal angles on the circumference of the rotor ring (20, 20') and each blade (30) is pivotally hinged by a separate pendulum hinge (32) at the rotor ring (20, 20'). The vanes (30) divide the fluid in the pumping chamber (25) into multiple pumping compartments (40), wherein the pumping chamber (25) is equipped with an automatically switching pressure matching valve (50, 50') for pre-opening the fluid connection between at least one pre-openable pumping compartment (40B) and the discharge opening (19) just before the pumping compartment (40B) has reached the discharge opening (19). The pre-opening fluid connection provides pressure matching between the pre-openable pumping compartment (40B) and the discharge pressure to reduce noise emissions caused by pressure pulsations resulting from sudden pressure equalization that occurs when the pumping compartment (40) reaches the discharge opening (19).

Description

Technical Field

[0001] This invention relates to an automotive swing-slider pump for supplying pressurized lubricant to the lubrication system of an internal combustion engine. Background Technology

[0002] The pendulum-slider pump is one of the most commonly used pump types for supplying lubricant to internal combustion engines. This type of lubricant pump is typically designed as a mechanical pump and can be mechanically driven, for example, by the crankshaft of the internal combustion engine.

[0003] Existing internal combustion engines have very high requirements regarding noise emissions and vibration. Therefore, these high requirements also apply to the entire peripheral components of the internal combustion engine.

[0004] Lubricant pumps have a significant impact on overall noise emissions, therefore vehicle manufacturers require pump manufacturers to provide lubricant pumps with low noise and low vibration. Swing-slider pumps, in particular, produce a destructive noise spectrum due to their potentially high operating speeds. Sudden hydraulic balancing within the pump chamber generates high-frequency pressure pulsations, resulting in substantial noise and vibration. Sudden changes in hydraulic pressure occur especially at the pump's discharge port. Whenever the fluid connection between a single rotating pump chamber and the discharge port is opened, the hydraulic pressure is abruptly balanced, resulting in acoustic opening noise.

[0005] Due to the equiangular arrangement of the pumping compartments, these sudden pressure balances produce a cumulative and constant pressure pulsation spectrum with significant noise levels.

[0006] DE 10 2010 023 068 A1 discloses a pendulum-slider pump with pendulum blades asymmetrically arranged on the circumference of the pumping chamber. The resulting variation in the circumferential distance between the individual pendulum blades provides irregular opening intervals for the fluid connection between each pumping compartment and the discharge opening, which leads to a non-periodic and wide-range pressure pulsation spectrum, thereby reducing pump noise emissions and vibration. The asymmetrical arrangement of the pendulum blades extends the pressure pulsation spectrum but has no effect on the intensity of the acoustic opening noise generated by sudden pressure equilibrium, which produces the actual noise emissions. Summary of the Invention

[0007] One object of the present invention is to provide a cost-effective automotive pendulum-slider pump with particularly low noise emissions and improved vibration characteristics.

[0008] This objective is achieved by a variable displacement lubricant pump having the features of claim 1.

[0009] The automotive pendulum-slider pump according to the invention includes a non-rotatable rotor housing and a rotatable rotor ring that rotates within the rotor housing and surrounds a pumping chamber having an intake opening and an exhaust opening. The pump also includes a rotatable rotor hub that is rotatably connected to the rotor ring and a plurality of pendulum blades, which are preferably, but not necessarily, arranged at equal angles on the circumference of the rotor ring. Each pendulum blade is pivotally hinged via an independent pendulum hinge at the rotor ring. The pendulum blades divide the fluid in the pumping chamber into a plurality of pumping compartments.

[0010] The pressure differential between the intake and exhaust ports can be relatively high. Typically, the intake port is at a low pressure level, and may be below atmospheric pressure. Conversely, the pressure level at the exhaust port is typically higher than the intake port pressure. The sudden opening of the fluid connection between the arriving pumping compartment and the exhaust port causes a sudden pressure equalization, producing an audible acoustic opening noise. This acoustic opening noise occurs with each pumping compartment arriving at the exhaust port, resulting in a substantially constant pressure pulsation spectrum. To modify this pressure pulsation spectrum, the pumping compartment is equipped with an automatically switching pressure adaptation valve for pre-opening the fluid connection between at least one pre-openable pumping compartment and the exhaust port.

[0011] The pressure adapter valve is arranged such that a fluid connection is provided between the pre-openable pumping compartment and the discharge port just before the pre-openable pumping compartment reaches the discharge port. This avoids the associated hydraulic losses during the suction process. The fluid connection between the pre-openable pumping compartment and the discharge port can be provided directly or indirectly. A direct fluid connection can be achieved, for example, by directly connecting the pre-openable pumping compartment to the discharge port via a connecting channel. Alternatively, an indirect fluid connection can be provided by fluidly connecting the pre-openable pumping compartment to an adjacent preceding pumping compartment that, when viewed in the rotational direction, reaches the discharge port before the pre-openable pumping compartment. The pre-openable pumping compartment is indirectly connected to the discharge port by fluidly connecting the pre-openable pumping compartment, which has not yet reached the discharge port, to a preceding pumping compartment that has reached the discharge port and is therefore at discharge pressure. Therefore, the pressure of the pre-openable pumping compartment is adapted to the discharge pressure.

[0012] The adaptation of pressure in the pre-openable pumping compartment to the discharge opening before the pre-openable pumping compartment reaches the discharge opening reduces the relative pressure difference between the pre-openable pumping compartment and the discharge opening at the moment the pre-openable pumping compartment reaches the discharge opening. This results in a less abrupt pressure balance when the pre-openable pumping compartment reaches the discharge opening and opens the actual direct fluid connection for discharging lubricant, thereby reducing the resulting hydraulic pulsation and acoustic opening noise at the discharge opening without consequently affecting pump efficiency. Therefore, the pre-opened fluid connection of the pre-openable pumping compartment is only temporarily opened just before it reaches the discharge opening, where acoustic opening noise is most destructive. Before and after the discharge process, the other non-pre-openable pumping compartments remain fluidly isolated from the discharge opening, so that pumping efficiency is essentially unaffected by the pressure adapter valve. Due to the pressure adapter valve, each pre-openable pumping compartment is fluidly connected to the discharge opening earlier, respectively, before the actual discharge process. As a result, the pressure pulsation spectrum is broadened, leading to lower noise emissions from the pump. The combination of this widely propagated pressure pulsation spectrum and reduced acoustic opening noise significantly reduces noise emission and vibration of the pendulum-slider pump.

[0013] The automatic switching pressure adapter valve is designed such that its switching function is preferably achieved through a temporary overlap of valve openings in a specific arrangement, where this overlap depends on the angular position of the rotor rings. One valve opening is preferably stationary, and another valve opening preferably rotates with a pre-openable pumping compartment, so that the valve openings do not permanently overlap, but only temporarily overlap at least once per rotor revolution. Therefore, the switching function is provided completely automatically and requires no additional switching or control equipment. When the valve openings overlap, the pressure adapter valve and the corresponding fluid connection are open. Otherwise, the pressure adapter valve and thus the fluid connection are closed.

[0014] The bypass flow rate is preferably relatively low during each pressure adapter valve opening interval to avoid significant pressure loss during the intake or discharge process. The valve opening area is relatively small to provide the throttling effect of the pressure adapter valve.

[0015] Typically, similar pressure pulsation effects occur on opposite sides of the pumping chamber as the pumping compartment reaches the suction opening after the discharge process. However, the acoustic opening noise caused by the pumping compartment reaching the suction opening is lower than that at the discharge opening, making pressure adaptation more relevant at the discharge opening. Therefore, providing another pressure adaptation valve at the suction opening may be advantageous.

[0016] In a preferred embodiment of the automotive swing-slider pump according to the invention, some, but not all, of the pumping compartments are pre-openable. The number of blades is preferably odd, and the number of pre-openable pumping compartments is less than the number of swing blades divided by 2. In this configuration, the pre-openable pumping compartments define an asymmetrical arrangement on the circumference of the pumping compartments. Since the number of blades is odd, a pump with, for example, seven swing blades includes three pre-openable pumping compartments equipped with pressure-adapting valves, such that the other four pumping compartments are not pre-openable. For example, the asymmetrical arrangement of the pre-openable pumping compartments (B) relative to the non-pre-openable pumping compartments (A) can be defined as: BABABAA. This particularly preferred asymmetrical arrangement results in more irregular opening intervals, thus providing a wider noise spectrum distribution than a pump with an even number of swing blades. Therefore, noise emissions and vibration are further reduced.

[0017] In a preferred embodiment of the invention, the rotor housing is provided with a single static connection channel. The static connection channel includes two openings. One opening is permanently connected to the discharge port, such that the connection channel is permanently under discharge pressure. The other valve opening preferably temporarily corresponds to the valve opening of a pre-openable pumping compartment at the rotor ring in an overlapping manner. During one complete rotation of the rotor ring, the valve opening of each pre-openable pumping compartment overlaps with the corresponding valve opening of the connection channel at least once consecutively, such that the fluid connection between the arriving pre-openable pumping compartment and the discharge port is opened at a defined pre-opening angle. The fluid connection is closed after the valve opening of the pre-openable pumping compartment has passed through the valve opening of the connection channel. Therefore, for each rotation of the rotor ring, the pressure matching valve automatically switches at least once, such that the pressure matching valve intermittently opens and closes the fluid connection during one rotation of the rotor ring, thereby providing pressure matching between the pre-openable pumping compartment and the discharge pressure just before the pre-openable pumping compartment actually reaches the discharge port.

[0018] In an alternative embodiment, two adjacent pumping compartments within the pumping chamber—the pre-openable pumping compartment and the adjacent front pumping compartment viewed from the direction of rotation—are fluidly connected via an automatically switching pressure adapter valve. Therefore, in addition to the valve opening at the pre-openable pumping compartment, the pressure adapter valve preferably includes another separate valve opening at the adjacent front pumping compartment, such that these two separate valve openings at the rotor ring define a valve opening pair. The two valve openings of the valve opening pair are preferably fluidly connected via a single static connection channel in the rotor housing, thereby allowing fluid connection between the two adjacent pumping compartments. This embodiment, with an alternative static connection channel, connects the pre-openable pumping compartment to the adjacent front pumping compartment, compared to a static connection channel that directly connects the pre-openable pumping compartment to the discharge port. Therefore, the fluid connection between the pre-openable pumping compartment and the discharge port is provided through the front pumping compartment, which is already in direct fluid contact with the discharge port. Thus, the pre-openable pumping compartment is indirectly connected to the discharge port just before it reaches it.

[0019] The shortcut created between adjacent pumping compartments results in bypass flow between the pumping compartments to provide pressure adaptation between the pre-openable subsequent pumping compartment and the preceding pumping compartment, and vice versa. Because the pressure of the pre-openable pumping compartment is adapted to the pressure of the adjacent preceding pumping compartment that is already connected to the discharge port and is therefore at the discharge pressure, the pressure of the (subsequent) pre-openable pumping compartment is indirectly adapted to the discharge pressure. However, the pressure balance between the pre-openable pumping compartment and the discharge port is equally smooth, and the resulting reduction in noise emissions is substantially as effective as in embodiments with a direct fluid connection between the pre-openable pumping compartment and the discharge port.

[0020] The alternative static connection channel arrangement allows the fluid connection between the two valve openings of a valve opening pair to open and close intermittently, making the indirect pressure adapter valve also a switching valve. Each pump rotation opens and closes each valve opening of the valve opening pair bypassing the connection channel by temporarily fluidly connecting the valve openings once via the connection channel, causing the pressure adapter valve to switch automatically and intermittently. Thus, the fluid connection between adjacent pumping compartments is provided individually at specific angular positions within the pumping compartment, and once per rotation. With this static connection channel, the fluid connection is only opened at defined positions within the pumping compartment, ensuring that the fluid connection is only opened when needed. As a result, no pumping efficiency loss occurs between adjacent pumping compartments during the suction or discharge process.

[0021] When the valve opening of the current compartment reaches the edge of the connecting channel opening, the connecting channel is pre-filled with lubricant flowing in from the preceding compartment through its valve opening, placing the connecting channel at discharge pressure. The timing of opening the pressure adapter valve depends only on the angular range and angular position of the valve openings of the subsequent compartment and the connecting channel. When the valve opening of the subsequent pumping compartment reaches the edge of the connecting channel opening, the pressure adapter valve opens, thus pre-opening the fluid connection between the preceding and subsequent compartments. This fluid connection remains open until the valve opening passes the closed edge of the connecting channel. Ignoring the active opening of the fluid connection by the pressure adapter valve itself, the effective pressure adapter function of the pressure adapter valve only operates when the vanes separating the preceding and subsequent compartments pass the edge of the discharge opening. In either case, the angular range of the connecting channel is greater than the angular range of the valve opening pair. The effective valve opening angle depends on the angular position and angular range of the connecting channel relative to the edge of the discharge opening, and the angular range and circumferential position of the valve opening relative to the vanes between the subsequently pre-opened pumping compartment and the adjacent preceding pumping compartment.

[0022] Typically, the pre-opening angle defines the range of angles from the pre-opening point of the fluid connection between the pre-openable pumping compartment and the discharge opening to the actual opening angle of the fluid connection between the pumping compartment and the discharge opening used in the discharge process. Therefore, the pre-opening angle essentially defines the effective valve opening angle. The pre-opening angle is primarily defined by the angle between the opening edge of the connecting passage and the opening edge of the discharge opening, i.e., the theoretical circumferential overlap between these two opening edges. This pre-opening angle is preferably 0.5–25.0°.

[0023] In a preferred embodiment of the invention, the valve opening is defined by a valve opening groove on the axial front surface of the rotor ring. The groove has a very low depth, preferably 0.1-5.0 mm, to provide the throttling effect.

[0024] In a preferred embodiment of the invention, the valve openings of each valve opening pair are arranged adjacent to a swing hinge, resulting in a relatively short fluid connection length between adjacent pumping compartments. This short connection length allows for short and efficient valve opening intervals, which is particularly important at higher speeds.

[0025] In a particularly preferred embodiment of the automotive pendulum-slider pump according to the invention, the rotor housing is defined by a non-rotatable and radially movable control ring. The control ring is radially movable to change the eccentricity between the rotor ring and the rotor hub. With this variable eccentricity, the displacement volume of the pumping compartment rotating within the pumping compartment is variable and adjustable, for example, according to the lubrication requirements of the internal combustion engine, such that the pump flow rate is independent of the pump speed. Preferably, the valve openings are arranged such that the opening and closing of the fluid connection is independent of the eccentricity of the control ring, thereby ensuring that the switching function of the pressure-adaptive valve is effective at any eccentric position of the control ring.

[0026] In a preferred embodiment of the invention, the connection channel is defined by a connection groove on the axial front surface of the rotor housing, located at the same axial end of the pumping chamber as the valve opening groove disposed in the rotor ring. Similar to the valve opening groove, the connection groove is also provided with a very low depth of 0.1-5.0 mm to provide a throttling effect for the pressure-adaptive valve, reducing pump efficiency losses at the valve opening. Advantageously, the valve opening groove and the corresponding connection groove are provided on both axial front surfaces to provide two fluid-parallel pressure-adaptive valves at each pre-openable pumping compartment. Attached Figure Description

[0027] Embodiments of the present invention are described with reference to the accompanying drawings, in which:

[0028] Figure 1 A first embodiment of the automotive swing-slider pump according to the invention is shown, which has a switching pressure adapter valve that, in a schematic cross-sectional view, provides an indirect fluid connection between a pre-openable pumping compartment and a discharge port via a front pumping compartment.

[0029] Figure 2 A second alternative embodiment of the automotive swing-slider pump according to the invention is shown, which has a switching pressure adapter valve that provides a direct fluid connection between a pre-openable pumping compartment and a discharge opening in a schematic cross-sectional view. Detailed Implementation

[0030] Figure 1 and Figure 2 An automotive pendulum-slider pump 10, 10' for pumping liquid lubricant within an internal combustion engine lubrication system is shown. The automotive pendulum-slider pump 10, 10' includes a rotor housing 12 defined by a radially movable control ring 15, which is pivotally hinged at a pivotable control ring joint 70 within a static pump housing 11. The pump 10, 10' includes rotatable rotor rings 20, 20' that rotate within the control ring 15 and surround a pumping chamber 25. The automotive pendulum-slider pump 10, 10' also includes a rotatable rotor hub 35 rotatably connected to the rotor rings 20, 20' and including seven pendulum blades 30 pivotally hinged to the rotor rings 20, 20'. Each pendulum blade 30 is pivotally hinged via a separate pendulum hinge 32 to fluidly divide the pumping chamber 25 into seven pumping compartments 40. One axial sidewall 28 of the pumping chamber 25 is defined by the static pump housing 11. The other axial sidewall is defined by a housing cover (not shown). The axial sidewall 28 has a crescent-shaped suction opening 18 for drawing lubricant into the pumping chamber 25 and a crescent-shaped effective discharge opening 19 for discharging lubricant.

[0031] The pivot control ring 15 changes the eccentricity of the rotor rings 20, 20' relative to the rotor hub 35, thereby changing the specific displacement volume of the pumping compartment 40, so that the pump flow rate can be adjusted independently of the rotational speed of the mechanical pendulum-slider pump 10, 10'.

[0032] exist Figure 1 In one embodiment, two adjacent pumping compartments 40 are fluidly connected by a pressure adapter valve 50, which includes a pair of valve openings 51 and two separate valve openings 52, 53 defined by radially oriented valve opening recesses 56, 57 at the axial front surface 22 of the rotor ring 20. A first valve opening 52 is located in the previously non-pre-openable pumping compartment 40A, and a second valve opening 53 is located in the subsequently pre-openable pumping compartment 40B. The valve opening recesses 56, 57 extend from the inner cylindrical surface 24 of the rotor ring 20 to the outer cylindrical surface 23 of the rotor ring 20 and are arranged adjacent to the swing hinge 32. The depth of the valve opening recesses 56, 57 is 0.1-5.0 mm. The valve openings 52, 53 are fluidly connected by a connecting channel 55 that bypasses the swing hinge 32, thereby fluidly connecting the previously non-pre-openable pumping compartment 40A and the subsequently pre-openable pumping compartment 40B.

[0033] The connecting channel 55 is defined by a connecting groove 59 on the axial front surface 16 of the control ring 15, which is located at the corresponding axial end of the pumping chamber 25, identical to the valve opening grooves 56, 57 on the rotor ring 20. The connecting groove 59 is arranged to theoretically overlap circumferentially with the opening edge 17 of the discharge opening 19 and extends in two circumferential directions about the opening edge 17 on the inner cylindrical surface 29 of the control ring 15. The axial depth of the connecting groove 59 is 0.1-5.0 mm. Through this connecting groove 59, the gap at the inner cylindrical surface 29 of the control ring 15 is opened, allowing the connecting groove 59 fluid access to the bypassed radially oriented valve openings 52, 53 in the rotor ring 20.

[0034] The angular range of the connecting groove 59 defines a connecting channel angle R of 20°, which is greater than the angular range of the valve opening pair 51. The angular range of the valve opening pair 51 is defined by the angle between the limiting valve opening edges of each valve opening pair 51. The effective fluid valve opening angle is substantially determined by the pre-opening angle β, which is defined by the angular range between the circumferential opening edge of the connecting groove 59 and the opening edge 17 of the discharge opening 19. Since the opening edge 53' of the valve opening 53 of the pre-openable pumping compartment 40B is circumferentially centered relative to the swing hinge 32, the effective fluid valve opening angle is significantly defined by the pre-opening angle β. This pre-opening angle β is approximately 5°.

[0035] The pressure adapter valve is an automatic switching valve, thus the connecting groove 59 intermittently fluidly connects the two valve openings 52, 53, thereby fluidly connecting the previously non-pre-openable pumping compartment 40A and the subsequently pre-openable pumping compartment 40B. The connecting groove 59 is arranged such that a fluid connection is provided between the preceding pumping compartment 40A and the subsequent pumping compartment 40B just before the subsequent pumping compartment 40B has reached the discharge opening 19. Therefore, when the first valve opening 52 of the preceding pumping compartment 40A overlaps with the connecting groove 59, the connecting groove 59 is pre-filled with lubricant from the preceding pumping compartment 40A, such that the connecting groove 59 is at discharge pressure. Subsequently, when the second valve opening 53 of the subsequent pumping compartment 40B overlaps with the connecting groove 59, i.e., if both valve openings 52, 53 overlap with the connecting groove 59 simultaneously, the pressure adapter valve 50 pre-opens the fluid connection between the previously non-pre-openable pumping compartment 40A and the subsequently pre-openable pumping compartment 40B. As a result, the subsequent pumping compartment 40B is indirectly in fluid communication with the discharge opening 19 via the preceding pumping compartment 40A until the vane 30' between the preceding pumping compartment 40A and the subsequent pumping compartment 40B passes the discharge opening edge 17. Therefore, the pressure in the subsequent pumping compartment 40B is adapted to the discharge pressure to reduce the pressure differential before the actual direct fluid connection between the subsequent pumping compartment 40B and the discharge opening 19 is opened. The lower pressure differential results in a reduction in pressure pulsations caused by the sudden pressure equilibrium between the subsequent pumping compartment 40B and the discharge opening 19.

[0036] The rotor ring 20 is provided with a limited number of valve opening pairs 51, depending on the number of swashplates 30 separating the pumping chambers 25. In this configuration, the swashplate-slider pump 10 is provided with an odd number of seven swashplates 30. The number of pre-openable pumping compartments 40B is less than the number of swashplates 30 divided by 2, such that the swashplate-slider pump 10 with seven swashplates 30 is provided with three valve opening pairs 51, each valve opening pair 51 located at one pre-openable pumping compartment 40B. Valve opening recesses 56, 57 are provided adjacent to and on either side of the swashplate hinges 32. The circumferential arrangement of the valve opening pairs 51 is asymmetrical. A pair of valve openings 51 is provided every other swashplate hinge 32. Because the number of swashplates 30 is odd, a single pumping compartment 40C is not in fluid communication with any of its adjacent pumping compartments 40. As a result, an asymmetrical arrangement of pre-openable pumping compartments 40B is provided. This asymmetrical arrangement of the pressure adapter valves 50 leads to an expansion of the pressure pulsation spectrum. In addition, the acoustic opening noise is reduced at the three oscillating blades 30, which further reduces the noise emissions of the oscillating-slider pump 10.

[0037] exist Figure 2In one embodiment, the pendulum-slider pump 10' is further provided with three pre-openable pumping compartments 40B. Each pre-openable pumping compartment 40B is provided with a valve opening 53, which is defined by a radially oriented valve opening groove 57 at the axial front surface 22' of the rotor ring 20'. Figure 1 Compared to the first embodiment, only the pre-openable pumping compartment 40B is provided with a valve opening 53. The pendulum-slider pump 10' is provided with an alternative connection channel 55', which is defined by a connection groove 59' at the axial front surface 16', which is located at the same axial end of the pumping chamber 25 as the valve opening groove 57 provided in the rotor ring 20'.

[0038] and Figure 1 Compared to the first embodiment, the angular range R' of the connecting groove 59' is increased, causing the connecting groove 59' to extend into the discharge opening region 19'. The connecting channel opening 60, defined by the radially oriented connecting channel opening groove 61, fluidly connects the connecting groove 59' to the discharge opening 19, such that the connecting groove 59' is permanently and directly fluidly connected to the discharge opening 19. The angular range R' of the connecting groove 59' is approximately 40°. Compared to the first embodiment, the connecting groove 59' and the discharge opening 19 are located at the same axial end of the pumping chamber 25 to provide direct fluid connection with the discharge opening 19. Due to this permanent fluid connection with the discharge opening 19, the connecting groove 59' is permanently under discharge pressure. If the valve opening groove 57 defining the valve opening 53 of the pre-openable pumping compartment reaches the connecting groove 59', the valve opening groove 57 and the connecting groove 59' overlap, thereby providing a fluid connection between the pre-openable pumping compartment 40B and the discharge opening 19. As a result, the pre-openable pumping compartment 40B is directly fluidly connected to the discharge opening 19 via the connecting channel 55' until, viewed from the rotational direction, the forward swing vane 30' of the pre-openable pumping compartment 40B passes the edge 17 of the discharge opening. This provides a connection with... Figure 1 The same pressure balancing effect is described in the embodiments. Since the position of the opening edge of the valve opening 53 at the pre-openable pumping compartment 40B and the pre-opening angle β are the same as those of the pendulum-slider pump 10 in the first embodiment, the effective fluid valve opening angle is also the same.

[0039] The circumferential arrangement of the pre-openable pumping compartment 40B and Figure 1 The asymmetrical arrangement of the pre-openable pumping compartment 40B is the same, and the same results are achieved in terms of the expansion of the pressure pulsation spectrum and the reduction of acoustic opening noise.

Claims

1. An automotive pendulum-slider pump (10, 10') for providing pressurized lubricant, comprising: Non-rotatable rotor housing (12), A rotatable rotor ring (20, 20') rotates within the rotor housing (12) and surrounds a pumping chamber (25) having a suction opening (18) and a discharge opening (19). A rotatable rotor hub (35), which is rotatably connected to the rotor rings (20, 20'), and Multiple pendulum blades (30) are arranged on the circumference of the rotor rings (20, 20') and each blade (30) is pivotally hinged to the rotor rings (20, 20') by a separate pendulum hinge (32). The vane (30) divides the fluid in the pumping chamber (25) into a plurality of pumping compartments (40), wherein the pumping chamber (25) is provided with an automatic switching pressure matching valve (50, 50') for pre-opening at least one pre-openable pumping compartment (40B) and the discharge opening (19) just before the pumping compartment (40B) has reached the discharge opening (19), such that the fluid connection is opened for a defined pre-opening angle of 0.5-25.0°, and wherein the pre-openable pumping compartment (40B) is provided with at least one valve opening (53) at the rotor ring (20), wherein the valve opening (52, 53) is defined by a valve opening groove (56, 57) at the axial front surface (22, 22') of the rotor ring (20, 20').

2. In the automotive swing-slider pump (10, 10') according to claim 1, some but not all of the pumping compartments (40) are pre-openable by pressure adapter valves (50, 50').

3. The automotive swing-slider pump (10) according to any one of the preceding claims, wherein the pressure adapter valve (50) fluidly connects two adjacent pumping compartments (40) such that a subsequent pre-openable pumping compartment (40B) that is not directly fluidly connected to the discharge opening (19) is indirectly fluidly connected to the discharge opening (19) via a front pumping compartment (40A) that is already directly fluidly connected to the discharge opening (19).

4. The automotive swing-slider pump (10) according to claim 3, wherein the pre-openable pumping compartment (40B) and their adjacent front pumping compartment (40A) are each provided with at least one valve opening (52, 53) at the rotor ring (20').

5. The automotive swing-slider pump (10') according to claim 1 or 2, wherein a single static connection channel (55') is provided at the rotor housing (12) to intermittently open and close the fluid connection between the valve opening (53) and the discharge opening (19) of the pre-openable pumping compartment (40B).

6. The automotive swing-slider pump (10) according to claim 4, wherein a single static connection channel (55) is provided at the rotor housing (12) to intermittently open and close the fluid connection between the valve opening (53) of the pre-openable pumping compartment (40B) and the valve opening (52) of the adjacent front pumping compartment (40A).

7. The automotive swing-slider pump (10, 10') according to any one of the preceding claims, wherein the number of swing blades (30) is preferably odd.

8. The automotive pendulum-slider pump (10, 10') according to claim 7, wherein the number of pre-openable pumping compartments (40B) is less than the number of pendulum blades (30) divided by 2.

9. The automotive swing-slider pump (10, 10') according to any one of claims 1-8, wherein the valve openings (52, 53) are arranged adjacent to the swing hinge (32).

10. The automotive pendulum-slider pump (10, 10') according to any one of the preceding claims, wherein the rotor housing (12) is defined by a non-rotatable and radially movable control ring (15) to change the eccentricity of the rotor ring (20, 20') relative to the rotor hub (35).

11. The automotive swing-slider pump (10) according to any one of claims 5-10, wherein the connecting channel (55, 55') is defined by a connecting groove (59, 59') at the axial front surface (16, 16') of the rotor housing (12), the connecting groove being located at the same axial end of the pumping chamber (25) as the groove (56, 57) provided in the rotor ring (20).

12. The automotive swing-slider pump (10) according to claim 1, wherein the depth of the groove (56, 57) in the rotor ring (20, 20') is 0.1-5.0 mm.

13. The automotive swing-slider pump (10) according to claim 11, wherein the depth of the groove (59, 59') in the rotor housing (12) is 0.1-5.0 mm.

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