DE102012213416A1 - Vane pump with adjustable flow rate - Google Patents

Abstract

An adjustable flow type vane pump 1 has a structure in which the separation of a vane 14 in a constant flow area and a pressure peak in a pump room are limited in an adjustable flow rate range and the generation of noise can be completely prevented. In this vane pump 1, an inner peripheral surface of a cam ring 15 is formed so that in a maximum eccentric state in which the eccentricity to the rotation center Or of the rotor 11 of the cam ring 15 is maximum, a radius vector (distance to the rotation center Or) in accordance with the rotation of a Res first sealing interval from an end of an intake port 22 to a start end of an exhaust port 21 at an intermediate point of the first sealing interval and a range from an intermediate point of a second sealing interval from an end of the exhaust port 21 to a starting end of the intake port 22 to an end point of the second sealing interval gradually becomes shorter Further, the inner circumferential surface of the cam ring 15 is formed so that the radius vector is substantially constant in a minimum eccentric state, or in accordance with the rotation of the rotor 11 in at least part of a region from the intermediate point of the first dic Hewungsinterval to its end point and at least a portion of a range from a starting point of the second sealing interval to the intermediate point of the second sealing interval is gradually longer.

Description

BACKGROUND

1. Technical area

The present invention relates to an adjustable flow vane pump used for working fluid application equipment, such as power steering, for example, for reducing a steering wheel operating force of a motor vehicle.

2. Related Technology

For the well-known technology related to this type of variable displacement vane pump, an adjustable flow rate pump ( JP-A No. 2002-115673 ), wherein the variable flow rate pump has a structure such that an inner diameter at a intermediate interval between an intake interval and an exhaust interval in a pumping space of a cam ring forms a negative declining curve with an end of an intake port as a starting point to obtain a pulsation phenomenon of To prevent working medium in a large eccentric portion of the cam ring, and further, the negative declining curve and a complete round curve are connected by a higher order curve.

Generally, in an adjustable flow rate vane pump, in a constant flow rate region corresponding to a low speed region of the pump in which the output per one revolution is constant when a situation occurs in which a vane is separated from the inner circumferential surface of a cam ring, causes a pressure pulsation or in an adjustable flow area corresponding to a high-speed area of the pump in which one output per one revolution decreases as the rotational speed of the pump increases, it is likely that the vibration due to the imbalance of the pressure compared to In a case of a vane pump with a constant flow rate increases, and since the pressure pulsation and vibration noise, it is a technical task to reduce this noise.

In the vane pump with adjustable flow rate, the in JP-A No. 2002-115673 is disclosed, to reduce the noise by the separation of a wing in a maximum eccentric state in which the eccentricity is maximum to a rotor of the cam ring, causes a distance to the center of rotation of the rotor in accordance with the rotation of the rotor in a range of An end of an intake port to a start end of an exhaust port and a portion of an end of the exhaust port to a start end of the intake port on an inner peripheral surface of the cam ring is gradually shorter, thereby preventing the separation of the wing and limits the occurrence of noise.

However, since the compressibility of the volume of the pump room increases in a variable flow area and the peak pressure increases when the inner peripheral surface of the cam ring has such a shape, the variable flow type vane pump has a problem that noise is likely to be generated by vibration.

In short, the variable flow vane pump, which in JP-A No. 2002-115673 has the structure that, even if the separation of the vane in a constant flow area is limited and the occurrence of noise caused by pressure pulsation can be prevented, a pressure peak in the pump room in the variable flow rate range is not limited and it is difficult to prevent the occurrence of noise by vibration.

SUMMARY

The present invention has been made in view of such a problem, and it is a technical object of the present invention to provide an adjustable flow vane pump having the structure that separation of a vane in a constant flow area and a pressure peak in a pump room be limited in an area with adjustable flow rate and the occurrence of noise caused by pressure pulsation and vibration can be completely prevented.

In order to achieve the above object according to a first aspect of the present invention, there is provided an adjustable flow type vane pump for transmitting a steering operation to a steered wheel on a steered wheel and for supplying working fluid to a steering gear for a vehicle which generates a steering assist force by hydraulic pressure produced the working medium. The variable flow vane pump includes a pump housing equipped with a pump element storage portion, a drive shaft connected by spindles to the pump housing, a rotor provided in the pump housing, which is rotationally driven by the drive shaft and has a plurality of slots in the circumferential direction. several wings in a freely protruding / are provided in the plurality of slots, a cam ring, which is formed as a ring movable on / above the pump element storage part and forms a plurality of pump chambers together with the rotor and the plurality of wings on an inner peripheral side, and / or a cam ring control mechanism, the Pump housing is provided and controls the eccentricity to the rotor of the cam ring. The pump housing is provided with a suction port open to a region where the volume of the plurality of pump chambers increases in accordance with the rotation of the rotor and an outlet port open to a region where the volume of the plurality of pump chambers decreases , An inner peripheral surface of the cam ring is formed so that in a maximum eccentric state in which the eccentricity to the rotor of the cam ring is maximum, the distance to the center of rotation of the rotor in accordance with the rotation of the rotor in a range from one end of the suction port to an intermediate point of the rotor End of the suction port and a start end of the discharge port and / or a region from an intermediate point of an end of the discharge port and a start end of the suction port to the start end of the suction port in a rotational direction of the rotor is gradually shorter, and / or the inner peripheral surface of the cam ring is formed so that in a minimum eccentric state, in which the eccentricity to the rotor of the cam ring is minimum, the distance to the center of rotation of the rotor is substantially constant, or in accordance with the rotation of the rotor in at least part of a range from the intermediate point of the end of the suction port to the start The outlet opening to the start end of the outlet opening substantially and / or at least part of a region from the end of the outlet opening to the intermediate point of the end of the outlet opening and the start end of the suction opening is gradually longer.

According to a second feature, in addition to the first feature, the drive shaft is rotationally driven by an engine of the vehicle, and the inner peripheral surface of the cam ring is formed so that when the vehicle is driven, the distance to the rotation center of the rotor is substantially constant or in accordance with the rotation of the rotor in at least part of the region from the intermediate point of the end of the suction port and the start end of the discharge port to the start end of the discharge port and / or at least part of the region from the end of the discharge port to the intermediate point of the end of the discharge port and the start end of the intake port is gradually increased.

According to a third feature, in addition to the first feature, the drive shaft is rotationally driven by the engine of the vehicle, and the inner circumferential surface of the cam ring is formed so that when the engine speed is 1500 rpm or more every minute, the distance to the rotation center of the rotor is substantially constant according to the rotation of the rotor in at least part of the region from the intermediate point of the end of the suction port and the start end of the discharge port to the start end of the discharge port and / or at least part of the region from the end of the discharge port to the intermediate point of the end of the discharge port and the start end of the intake port is getting longer.

According to a fourth feature, in addition to the first feature, the inner peripheral surface of the cam ring is formed such that in the maximum eccentric state, the region from the end of the suction port to the intermediate point of the end of the suction port and the start end of the exhaust port and / or the region from the intermediate point of the end of the exhaust port and the start end of the suction port to the start end of the suction port and / or regions before and after at least the one connected to at least the one are connected by a higher order curve, and the inner peripheral surface of the cam ring is formed so that in the minimum eccentric state Area from the intermediate point of the end of the suction opening and the start end of the outlet opening to the start end of the outlet opening and / or the area from the end of the outlet opening to the intermediate point of the end of the outlet opening and the start end of the suction opening and / or areas before and after at least the one with are connected to at least one connected by a higher order curve.

According to a fifth feature, in addition to the first feature, the inner circumferential surface of the cam ring is formed so that in the minimum eccentric state, the distance to the rotation center of the rotor in accordance with the rotation of the rotor in at least a portion of the range from the intermediate point of the end of the suction port and the start end of the discharge port to the start end of the discharge port and / or at least a part of the region from the end of the discharge port to the intermediate point of the end of the discharge port and the start end of the intake port becomes gradually longer.

According to a sixth feature, in addition to the first feature, eccentricity to the rotor of the cam ring is achieved by pivoting or rolling the cam ring in a state in which the cam ring is supported by a support surface provided on one side of the discharge opening of an inner peripheral surface of the pump element storage part. controlled.

According to a seventh feature, in addition to the sixth feature, the center of a Inside diameter of the cam ring on the side of the suction opening remote from the center of the rotor in a non-loaded position in which a differential pressure between the pressure on the side of the suction port and the pressure on the side of the outlet opening is not on the drive shaft, the rotor and the Cam ring acts, and is in a state in which the drive shaft is elastically deformed on the side of the suction port by the action of the differential pressure, a relative position based on an opening reference line on the side of the outlet opening remote from the relative position in the unloaded Is located, the cam ring is rollably supported by a support surface which is provided on the side of the outlet opening of the inner peripheral surface of the pump element storage part, and the support surface is formed so that, when the cam ring in a direction from the maximum eccentric state to the minimum eccentric RECOGNIZED is rolled, the center of the inside diameter of the cam ring on the side of the discharge port gradually separates from the opening reference line.

According to an eighth feature, in addition to the first feature, the inner peripheral surface of the cam ring is formed so that in the maximum eccentric state, the distance to the rotation center of the rotor in accordance with the rotation of the rotor in the region from the end of the suction port to the intermediate point of the end of the suction port and the starting end of Outlet opening in the direction of rotation of the rotor is gradually shorter, and the inner peripheral surface of the cam ring is formed so that in the minimum eccentric state, the distance to the center of rotation of the rotor is substantially constant or in accordance with the rotation of the rotor in at least a portion of the range from the intermediate point of End of the suction port and the start end of the exhaust port to the start end of the exhaust port is gradually longer.

According to a ninth aspect, in addition to the eighth feature, the inner circumferential surface of the cam ring is formed such that in the maximum eccentric state, the distance to the rotational center of the rotor in accordance with the rotation of the rotor in the region from the end of the suction port to the intermediate point of the end of the suction port and the starting end the outlet opening and in the area from the intermediate point of the end of the outlet opening and the start end of the suction opening in the rotational direction of the rotor is gradually shorter and the inner peripheral surface of the cam ring is formed so that in the minimum eccentric state, the distance to the center of rotation of the rotor is substantially constant or in accordance with the rotation of the rotor in at least part of the region from the intermediate point of the end of the suction port and the starting end of the discharge port to the starting end of the discharge port and in at least part of the region from the end of the discharge port to the intermediate point of the end the outlet opening and the start end of the suction opening is gradually longer.

According to a tenth feature, in addition to the first feature, the rotor is provided with the plural odd-numbered slots and the plural odd-numbered blades.

According to an eleventh aspect of the present invention, there is provided an adjustable flow type vane pump for transmitting a steering operation to a steered wheel to a steered wheel and supplying a working fluid to a steering gear for a vehicle that generates a steering assist force by the hydraulic pressure of the working fluid. The variable flow vane pump includes a pump housing equipped with a pump element storage portion, a drive shaft connected by spindles to the pump housing, a rotor provided in the pump housing, which is rotationally driven by the drive shaft and has a plurality of slots in the circumferential direction. a plurality of vanes provided in a freely projecting / contracting manner in the plurality of slots, a cam ring formed as a ring movably on / above the pump element storage portion and forming a plurality of pump spaces together with the rotor and the plurality of vanes on an inner peripheral side, and a cam ring control mechanism provided on the pump housing and controlling the eccentricity to the rotor of the cam ring. The pump housing is provided with a suction port open to a region where the volume of the plurality of pump chambers increases in accordance with the rotation of the rotor and an outlet port open to a region where the volume of the plurality of pump chambers decreases , And an inner peripheral surface of the cam ring is formed so that in a maximum eccentric state in which the eccentricity to the rotor of the cam ring is maximum, the distance to the center of rotation of the rotor in accordance with the rotation of the rotor in a range from one end of the suction port to a Starting end of the outlet opening in a rotational direction of the rotor and / or a region from one end of the outlet opening to a start end of the suction opening is gradually shorter, and the inner peripheral surface of the cam ring is formed so that in a minimum eccentric state in which the eccentricity to the rotor of Cam ring is minimal, the distance to the rotation center of the rotor is substantially constant or in accordance with the rotation of the rotor in at least a portion of the region from the end of the suction port to the start end of the discharge port and / or at least a portion of the region from the end of the discharge port to the start end of the intake port is gradually longer.

According to a twelfth feature, in addition to the eleventh feature, the drive shaft is rotationally driven by an engine of the vehicle, and the inner peripheral surface of the cam ring is formed so that when the vehicle is driven, the distance to the rotation center of the rotor is substantially constant or in accordance with the rotation of the rotor in at least part of the region from the end of the suction port to the start end of the discharge port and / or at least part of the region from the end of the discharge port to the start end of the suction port is gradually increased.

According to a thirteenth feature, in addition to the eleventh feature, the drive shaft is rotationally driven by the engine of the vehicle, and the inner peripheral surface of the cam ring is formed so that when the engine speed is 1500 rpm or more every minute, the distance to the rotation center of the rotor is substantially constant in accordance with the rotation of the rotor in at least part of the area from the end of the suction port to the start end of the discharge port and / or at least a part of the range from the end of the discharge port to the start end of the intake port becomes gradually longer.

According to a fourteenth feature, in addition to the eleventh feature, the eccentricity to the rotor is controlled by pivoting or rolling the cam ring in a state in which the cam ring is supported by a support surface provided on a discharge opening side of an inner peripheral surface of the pump element storage part.

According to a fifteenth aspect, in addition to the fourteenth feature, the center of an inner diameter of the cam ring on the side of the suction port is based on an opening reference line connecting the intermediate point of the end of the suction port with the start end of the discharge port and the center of the rotor in an unloaded position. in which a differential pressure between the pressure on the side of the suction port and pressure on the side of the discharge port does not act on the drive shaft, the rotor and the cam ring, a relative position based on the opening reference line in the unloaded position in which the drive shaft the side of the suction port is elastically deformed by the action of the differential pressure, located on the side of the outlet opening remote from the relative position, the cam ring is rollably supported by the support surface which is on the side of the outlet opening of the inner peripheral surface of the pump element Spe is provided and the support surface is formed so that when the cam ring is rolled in a direction from the maximum eccentric state to the minimum eccentric state, the center of the inner diameter of the cam ring gradually separates from the opening reference line.

According to a sixteenth aspect of the present invention, there is provided an adjustable flow type vane pump for transmitting a steering operation on a steered wheel to a steered wheel and supplying working fluid to a steering gear for a vehicle which generates a steering assist force by the hydraulic pressure of the working fluid. The variable flow vane pump includes a pump housing equipped with a pump element storage portion, a drive shaft connected by spindles to the pump housing, a rotor provided in the pump housing, which is rotationally driven by the drive shaft and has a plurality of slots in the circumferential direction. a plurality of vanes movably provided in the plural slots, a cam ring formed as a ring movably on / above the pump element storage portion and forming a plurality of pump spaces together with the rotor and the plurality of vanes on an inner peripheral side, and a cam ring control mechanism; which is provided on the pump housing and controls the eccentricity to the rotor of the cam ring. The pump housing is provided with a suction port open to a region where the volume of the plurality of pump chambers increases in accordance with the rotation of the rotor and an outlet port open to a region where the volume of the plurality of pump chambers decreases That is, an inner peripheral surface of the cam ring is formed so that, in a maximum eccentric state in which the eccentricity is maximum to the rotor of the cam ring in a state in which the cam ring by the effect of differential pressure between the pressure on the side of the suction port and the Pressure on the side of the exhaust port on the drive shaft, the rotor and the cam ring is relatively moved from the side of the exhaust port to the side of the exhaust port, compared to an unloaded position in which no differential pressure acts, the distance to the center of rotation of the rotor in accordance with the rotation of the rotor in a region of one end of the intake port ng to a start end of the discharge port in the rotational direction of the rotor and / or a region from an end of the discharge port to a starting end of the suction port is gradually shorter, and the inner peripheral surface of the cam ring is formed so that in a minimum eccentric state in which the eccentricity to Rotor of the cam ring is minimal, the distance to the center of rotation of the rotor is substantially constant, or in accordance with the rotation of the rotor in at least one Part of the area from the end of the suction opening to the start end of the outlet opening and / or at least a portion of the area from the end of the outlet opening to the start end of the suction opening is gradually longer.

According to a seventeenth aspect, in addition to the sixteenth feature, the drive shaft is rotationally driven by an engine of the vehicle, and the inner peripheral surface of the cam ring is formed so that when the vehicle is driven, the distance to the rotation center of the rotor is substantially constant or in accordance with the rotation of the rotor in at least part of the region from the end of the suction port to the start end of the discharge port and / or at least part of the region from the end of the discharge port to the start end of the suction port is gradually increased.

According to an eighteenth feature, in addition to the sixteenth feature, the drive shaft is rotationally driven by the engine of the vehicle, and the inner peripheral surface of the cam ring is formed so that when the engine speed is 1500 rpm or more every minute, the distance to the rotation center of the rotor is substantially constant in accordance with the rotation of the rotor in at least part of the area from the end of the suction port to the start end of the discharge port and / or at least a part of the range from the end of the discharge port to the start end of the intake port becomes gradually longer.

According to a nineteenth feature, in addition to the sixteenth feature, the eccentricity to the rotor of the cam ring is controlled by pivoting or rolling the cam ring in a state in which the cam ring is supported by a support surface provided on one side of the discharge opening of an inner peripheral surface of the pump element storage part ,

According to a twentieth feature in addition to the nineteenth feature, and has the characteristic that the center of an inner diameter of the cam ring on the side of the suction port is located away from an opening reference line which is an intermediate point of the end of the suction port with the start end of the exhaust port and the center of the rotor the unloaded layer in which a differential pressure between the pressure on the side of the suction port and the pressure on the side of the discharge port does not act on the drive shaft, the rotor and the cam ring, a relative position based on the opening reference line in a state in which the drive shaft on the side of the suction port is elastically deformed by the action of the differential pressure is located on the exhaust port side remote from the relative position in the unloaded state, the cam ring is rollably supported by the support surface facing the exhaust port side is provided to the inner peripheral surface of the pump member storage member and the support surface is formed so that when the cam ring is rolled in a direction from the maximum eccentric state to the minimum eccentric state, the center of the inner diameter of the cam ring gradually separates from the opening reference line.

According to the variable flow vane pump of the present invention, since the variable flow vane pump has the structure in which both the separation of the vane in the constant flow area and a pressure peak in the pump room in the variable flow area can be achieved by developing a shape of the inner peripheral surface of the pump Cylinder ring can be completely prevented from generating noise by pressure pulsation and vibration, regardless of whether the vane pump is operated with adjustable flow rate in the range of constant flow or in the range with adjustable flow rate.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will be described in detail based on the following drawings in which:

1 Fig. 13 is a side view showing the basic structure of an adjustable flow rate vane pump according to a first embodiment of the present invention, taken along a widened direction of a drive shaft;

2 10 is a sectional view showing a maximum eccentric state in which the eccentricity to a rotor of a cam ring in the variable flow type vane pump corresponding to the first embodiment of the present invention is maximum and along the line AA in FIG 1 is seen;

3 10 is a sectional view showing a minimum eccentric state in which the eccentricity to the rotor of the cam ring in the variable flow type vane pump corresponding to the first embodiment of the present invention is minimum and along the line AA in FIG 1 is seen;

4 is a schematic drawing showing a relative positional relationship between an inner peripheral surface of the cam ring, a suction port and an exhaust port in a Pressure plate in the in 2 shows the maximum eccentric state illustrated;

5 FIG. 12 is a schematic drawing showing a relative positional relationship between the inner peripheral surface of the cam ring, the suction port and the discharge port in the pressure plate in FIG 3 illustrated minimal eccentric condition;

6A to 6C Characteristic drawings showing a distance between the rotational center of the rotor and the inner peripheral surface of the cam ring in a first sealing interval in the variable flow type vane pump according to the first embodiment of the present invention; 6A is the characteristic plot showing a radius vector at an angle in the maximum eccentric state, 6B is the characteristic plot showing the radius vector to the angle in the minimum eccentric state, and 6C Fig. 11 is the characteristic drawing showing the volume to a center angle of a wing chamber in the minimum eccentric state;

7A to 7C Characteristic drawings showing a distance between the rotational center of the rotor and the inner peripheral surface of the cam ring in a second sealing interval in the variable flow vane pump according to the first embodiment of the present invention; 7A is the characteristic plot showing a radius vector at an angle in the maximum eccentric state, 7B is the characteristic plot showing the radius vector to the angle in the minimum eccentric state, and 7C is the characteristic drawing showing the volume to the central angle of a wing chamber in the minimum eccentric state;

8th Fig. 12 is a schematic drawing showing a portion of a local part for explaining the blade separating mechanism, which is structurally caused before the improvement of the variable flow type vane pump according to the first embodiment of the present invention;

9 Fig. 10 is a characteristic drawing showing the pressure at an angle for explaining a pressure peak in a wing chamber, which is caused in the construction prior to the improvement of the variable flow type vane pump according to the first embodiment of the present invention; and

10A and 10B are schematic drawings showing the relative positional relationship between a rotor, a cam ring, an exhaust port and a suction port relative to a support surface provided on an adapter in an adjustable flow vane pump according to the fifth embodiment of the present invention; 10A is the schematic drawing showing the relative positional relationship in a maximum eccentric state, and 10B Fig. 12 is the schematic drawing showing the relative positional relationship in a minimum eccentric state.

DETAILED DESCRIPTION

With reference to the drawings, some embodiments of an adjustable flow vane pump according to the present invention will now be described in detail.

First embodiment

1 is a side view showing the basic structure of a vane pump 1 with adjustable flow rate, which corresponds to a first embodiment of the present invention, as a section along an extended direction of a shaft 13 seen which is a drive shaft. 2 is a sectional view taken along the line AA in 1 in a state that the eccentricity becomes a rotor 11 a cam ring 15 in the vane pump 1 with adjustable flow rate is maximum. 3 is a sectional view taken along the line AA in 1 in a condition that the eccentricity to the rotor 11 of the cam ring 15 in the vane pump 1 with adjustable flow rate is minimal. 4 FIG. 12 is a schematic drawing showing a relative positional relationship between an inner circumferential surface of the cam ring. FIG 15 , a suction port 22 or an outlet opening 21 in a printing plate 27 in the maximum eccentric state shows in 2 is illustrated. 5 is a schematic drawing showing the relative positional relationship between the inner peripheral surface of the cam ring 15 , the intake opening 22 or the outlet opening 21 in the printing plate 27 in the minimum eccentric state shown in 3 is illustrated. Moreover, it corresponds 1 the section along the line BB in 2 , In the 4 and 5 Dotted lines shown show cases in which the inner peripheral surface of the cam ring 15 makes a complete round.

As shown in these drawings, the vane pump has 1 with adjustable flow, a body structure as a pump housing, by fitting a recessed front body 10 in which pump components including the rotor 11 , a grand piano 14 , the cam ring 15 , an adapter 12 , the printing plate 27 and a control valve 30 fitted and inserted, with a rear cover 19 is configured.

A wave 13 , which is a drive shaft for transmitting a driving force from an external device, connects to the rotor 11 these components and the shaft 13 gets from the front body 10 about a camp 28 supported. Multiple (for example, an odd number) slots 29 are on the rotor 11 provided and the wing 14 in a radially freely projecting / retracting manner in each slot 29 is inserted in each slot. A wing bottom 31 is at an inner end of each slot 29 intended. The rotor 11 gets off the shaft 13 driven in rotation.

The adapter 12 is in a depression of the front body 10 and the cam ring 15 fitted, which pivots from the inside of the adapter 12 with a carrying pin 16 is supported, since the center is arranged in a state that the center of its inner diameter to the center of rotation of the rotor 11 is eccentric. A first fluid pressure chamber 34 is on the left side of the cam ring 15 trained as in 2 through the cam ring 15 and the adapter 12 and a second fluid pressure chamber 35 is formed on the right side. The cam ring 15 is from a helical compression spring 17 compressed in a direction in which the pumping capacity of a wing chamber 18 is maximum.

The space between the rotor 11 and the cam ring 15 is through the wing 14 divided and several wing chambers 18 are trained. The outlet opening 21 as an outlet is connected to an area whose volume by rotation of each wing chamber 18 in counterclockwise direction in 2 is reduced, and the intake 22 as inlet is connected to an area whose volume is increased. Moreover, the pressure plate 27 between a group from the rotor 11 , the cam ring 15 , the wing 14 and the adapter 12 as well as the front body 10 fitted.

The control valve 30 is through a valve hole 30a in the front body 10 is formed, a coil 30b , slidable in the valve hole 30a is arranged, and a spring 30c configured. A spring chamber 36 is on the side of one end of the control valve 30 provided and the spring 30c is in the spring chamber 36 built-in. The control valve 30 becomes in accordance with a relationship between the force by pressure in a control valve high-pressure chamber 37 on the side of the other end, force by pressure in the spring chamber 36 on the side of one end and force by biasing force of the spring 30c almost pressed. When in 2 a force to the right by a pressure difference between the control valve high-pressure chamber 37 and the spring chamber 36 greater than the left-handed force through the spring 30c is and the coil 30b is moved to the right, as a result, a channel becomes a passage 33 connected to the control valve high pressure chamber 37 and the first fluid pressure chamber 34 connected, widened and a channel between the passage 33 and the side of a tank, not shown, is narrowed.

Incidentally, the control valve function 30 , the first fluid pressure chamber 34 , the second fluid pressure chamber 35 and others, each on the front body 10 are provided as a cam ring control mechanism for controlling the eccentricity to the rotor 11 of the cam ring 15 through fluid pressure in cooperation during operation.

Below is an outline of the inner peripheral surface of the cam ring 15 described. The cam ring 15 is in the maximum eccentric state, that the center of its inner diameter in the most eccentric position to the center of rotation Or of the rotor 11 , as in 4 shown in such a state as in 2 shown in which the pump is not operated. Incidentally, by a later described operation of in 3 shown cam ring 15 rotated in the minimum eccentric state that the center of its inner diameter is moved in a direction in which the eccentricity to the center of rotation Or of the rotor 11 reduced and the eccentricity is minimal in an operational area, as in 5 shown.

A distance between the center of rotation Or of the rotor 11 and the inner peripheral surface of the cam ring 15 is referred to as a radius vector, at an interval from one end of the suction port 22 to a starting end of the outlet opening 21 in a direction of rotation of the rotor 11 seal the wings 14 the wing chamber 18 against pressure on the tank and the wing chamber 18 against outlet pressure, the interval being referred to as the first sealing interval and the same interval from one end of the outlet opening 21 to a starting end of the intake 22 is referred to as the second sealing interval.

6A are 6C are characteristic drawings showing a distance between the center of rotation Or of the rotor 11 and the inner peripheral surface of the cam ring 15 in the first Sealing interval in the vane pump 1 with adjustable flow rate, 6A is the characteristic plot showing the radius vector at an angle in the maximum eccentric state, 6B is the characteristic plot showing the radius vector to the angle in the minimum eccentric state, and 6C is the characteristic plot, which is the volume of the wing chamber 18 to its center angle in the minimum eccentric state. 7A to 7C are characteristic drawings showing a distance between the center of rotation Or of the rotor 11 and the inner peripheral surface of the cam ring 15 in the second sealing interval in the vane pump 1 with adjustable flow rate, 7A is the characteristic plot showing the radius vector at an angle in the maximum eccentric state, 7B is the characteristic plot showing the radius vector to the angle in the minimum eccentric state, and 7C is the characteristic plot, which is the volume of the wing chamber 18 to its central angle in the minimum eccentric state. Dotted lines in the characteristic drawings in the 6A to 6C and 7A to 7C show cases where the inner peripheral surface of the cam ring 15 makes a complete round.

Concretely speaking, the relationship between the angle and the radius vector in the in 4 shown maximum eccentric state as a characteristic in the first sealing interval in 6A shown, and in 7A For example, a characteristic curve showing the relationship between the angle and the radius vector in the maximum eccentric state in the second sealing interval is shown in a similar manner.

Referring to 6A and 7A , is the inner peripheral surface of the cam ring 15 in the first embodiment, the radius vector is formed in a range from a starting point of the first sealing interval (the end of the suction port 22 ) to an intermediate point of the first sealing interval (an intermediate point of the end of the suction port 22 and the start end of the exhaust port 21 ) and in an area from an intermediate point of the second sealing interval (an intermediate point of the end of the exhaust port 21 and the start end of the intake 22 ) to an end point of the second seal interval (the start end of the suction port 22 ) gradually becomes shorter.

Moreover, when the cam ring varies 15 is moved so that he is in the in 5 The relationship between the angle and the radius vector as shown in the characteristic drawings is shown by minimum eccentric state in 6B and 7B , Then, referring to 6B and 7B the inner peripheral surface of the cam ring 15 in the first embodiment, the radius vector is substantially constant or in accordance with the rotation of the rotor 11 in at least part of a range from the intermediate point of the first sealing interval (the intermediate point of the end of the suction port 22 and the start end of the exhaust port 21 ) to the end point of the first sealing interval (the start end of the outlet opening 21 ) and at least part of a range from a starting point of the second sealing interval (the end of the exhaust port 21 ) to the intermediate point of the second sealing interval (the intermediate point of the end of the outlet opening 21 and the start end of the intake 22 ) is getting longer.

Furthermore, according to such a structure, wherein 6C Reference is made, in the minimum eccentric state in the first sealing interval in a first restriction interval, in which pressure in the wing chamber 18 of pressure on the tank for discharging pressure varies (an interval in operation, since the wing 14 on the back of the wing chamber 18 the end of the intake 22 happened until the wing 14 on the front of the wing chamber the starting end of the outlet opening 21 achieved, as described in detail below), the reduction of the volume of the wing chamber 18 be reduced in a small area at the central angle of the wing chamber. Moreover, with reference to FIG 7C , in the minimum eccentric state in the second sealing interval in a second restriction interval, in which pressure in the wing chamber 18 from outlet pressure to pressure on the tank varies (an interval in operation, since the wing 14 on the back of the wing chamber 18 the end of the outlet opening 21 happened until the wing 14 on the front of the wing chamber the starting end of the intake 22 achieved, as described in detail below), the volume of the wing chamber 18 in a small area at the central angle of the wing chamber a tiny inclination, which changes from increase to decrease.

The radius vector is not independent in the maximum eccentric state and the minimum eccentric state, but if the reduction of the radius vector in the maximum eccentric state is not excessive, the radius vector may be caused to be in the minimum eccentric state in the range from the intermediate point of the first seal interval to the end point of the first sealing interval and in the range from the starting point of the second sealing interval to the intermediate point of the second sealing interval is substantially constant or gradually becomes longer.

Next, the connection of a passage between chambers will be described. The intake opening 22 is connected to the tank, not shown. The outlet opening 21 stands with a pressure chamber 26 on the side of the front body 10 via a passage, not shown, connected to the pressure plate 27 is provided. The pressure chamber 26 is over a pipe 32 connected on the outlet side, with a not shown power cylinder and others and a muzzle 23 is connected, and is also about an upstream part 32a of the pipe on the outlet side with the spring chamber 36 connected. Moreover, the pressure chamber is 26 via a damper mouth 20 with the control valve high pressure chamber 37 connected. Of Further is the pressure chamber 26 via a passage, not shown, also with the wing bottom 31 connected.

Below is the operation of the vane pump 1 with adjustable flow rate described. If from the shaft 13 a rotary drive force is input, the wing becomes 14 together with the rotor 11 rotated by centrifugal force on the cam ring 15 and pressure on the wing bottom 31 is pressed, and the volume of the wing chamber 18 is increasing and decreasing. In the interval in which the volume increases, the pressure in the wing chamber drops 18 From and working fluid is from the suction port 22 sucked. This interval can be called the intake interval. Pressure on the aspirated working fluid is in accordance with the decrease in the volume of the wing chamber 18 in the 6C increases shown in the first restriction interval, in which both the tank and the pressure chamber 26 are not connected.

The working medium to which the pressure is increased is discharged from the outlet port 21 in accordance with the decrease in the volume of the wing chamber 18 to the pressure chamber 26 directed. This interval can be called the outlet interval. Further, the pressure in the wing chamber drops 18 through the in 7C shown second restriction interval, in which both the tank and the pressure chamber 26 are not connected, and the processing goes back to a suction process.

When the speed of the pump is low, the cam ring becomes 15 pressed in one direction, in which the volume of the pump through the helical compression spring 17 is maximum, and at this time, the eccentricity is between the center of the inner diameter of the cam ring 15 and the center of rotation Or of the rotor 11 maximum. Since the output per one revolution of the pump is constant in this maximum eccentric state even if the rotational speed varies, such a low rotational speed range of the pump in which the output per one rotation is constant is referred to as a constant flow rate region.

As the speed of the pump increases and the output increases, so does the pressure drop in the muzzle 23 to, a rightward force due to the pressure difference between both ends of the control valve 30 overcomes the left-handed force of the spring 30c and the control valve 30 in 2 is moved to the right. At this time, working fluid is on the downstream side of the damper mouth 20 over the open control valve 30 in the first fluid pressure chamber 34 passed, the cam ring 15 is pivoted in one direction, in which the eccentricity of the cam ring 15 is reduced, and the output per one turn is reduced. Such a high speed range of the pump in which the output per one rotation decreases as the speed of the pump increases is called the range of the adjustable flow rate.

It is known that in the vane pump 1 with variable flow rate, the main causes causing noise are different in the constant flow rate range and the achievable flow rate range, it is assumed that in the constant flow rate range, pressure pulsation through the separation of the blade in which one end of the blade 14 from the inner peripheral surface of the cam ring 15 is the main reason which causes noise, and it is assumed that in the variable flow range, vibration by a pressure spike occurring in the vane chamber 18 the main reason causing noise is caused.

8th Fig. 12 is a schematic drawing showing a portion of a local part for explaining the mechanism of the separation of the wing, which is in the construction prior to the improvement of the vane pump 1 is caused with adjustable flow rate.

Because high oil pressure only on the front of the wing 14 acts, takes when the wing chamber 18 from suction to exhaust operation assuming operation in the first sealing interval in the maximum eccentric state, frictional force against a projected direction when the vane 14 in the slot 29 of the rotor 11 is pressed, the friction force is greater than the centrifugal force acting on the wing 14 acts, and the oil pressure on the wing bottom 31 , and a force in the direction in which the wing out of the slot 29 protrudes, can be reduced. Furthermore, it varies when the pressure in the wing chamber 18 by proceeding from the suction process to the exhaust operation or from the exhaust operation to the suction process, the pressure balance of each wing chamber fluctuates 18 and the wave 13 is deformed. The separation of the wing occurs with probability. The separation of the wing is that the rotor 11 by the amount of deformation of the shaft 13 and the amount of play between the shaft 13 and the rotor 11 is moved, and the wing 14 is also moved in one direction, in which the wing by friction in the slot 29 of the rotor 11 from the inner peripheral surface of the cam ring 15 is disconnected.

When oil flows rapidly from the high pressure side to the low pressure side when the separation of the blade occurs, a pressure pulsation is generated. There a first half of the first sealing interval is an area in which the wing chamber 18 in front of the wing 14 has a pressure peak, it is particularly likely that the phenomenon of pressure pulsation occurs.

Then, in the improved structure of the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, the separation of the wing limited and the pressure pulsation can be limited, since the inner peripheral surface of the cam ring 15 has such a shape that the radius vector becomes shorter in the first sealing interval as described above.

Equally effective when the wing chamber 18 From the exhausting process to the suction continues, high oil pressure only on the back of the wing 14 , a frictional force is in the slot 29 of the rotor 11 generated and the separation of the wing is easily caused. In particular, it is because the wing chamber 18 on the front side is an area having a pressure peak in the area from the intermediate point to the end point of the second sealing interval, it is likely that the separation of the wing occurs.

Then, in the improved structure of the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, the separation of the wing be limited because the inner peripheral surface of the cam ring 15 has such a shape that the radius vector gradually becomes shorter in the second sealing interval as described above.

9 is a characteristic plot that shows pressure at an angle to a pressure peak in the wing chamber 18 to explain in the construction before the improvement of the vane pump 1 is caused with adjustable flow rate.

When the wing chamber 18 is in the first restriction interval, wherein an actuation in the first sealing interval in the minimum eccentric state is assumed and both the suction port 22 as well as the outlet opening 21 are not connected, the pressure in a pump room rises above the outlet pressure when the volume of the wing chamber 18 at that time decreases, and one in 9 shown pressure peak is caused.

The reduction in volume in the first restriction interval has since the wing 14 on the back of the wing chamber 18 the end of the intake 22 happened until the wing 14 on the front, the start end of the outlet opening 21 achieved, an effect on the pressure peak. A difference for this while between the volume, when the wing 14 passing on the front, and the volume when the wing 14 passing behind corresponds to the compressed volume. However, since the first restriction interval is a very short interval, the volume of the wing chamber decreases 18 in the first constraint interval, when the radius vector at the end point of the start point and the end point of the first seal interval is shorter, and it can be said that the pressure spike is likely to be caused.

In the improved construction of the vane pump 1 With adjustable flow rate, which corresponds to the first embodiment, then, since the inner peripheral surface of the cam ring 15 such a shape that the radius vector is substantially constant or becomes gradually longer in the range from the intermediate point to the end point of the first sealing interval in the minimum eccentric state as described above causes radii at the starting point and the end point of the first sealing interval to become the same Approach value, the reduction in volume is limited and the pressure peak can be reduced.

Equally it is when the wing chamber 18 is located in the second restriction interval, also likely that the pressure peak is caused because the volume of the wing chamber 18 decreases.

The reduction in volume in the second restriction interval has since the wing 14 on the back of the wing chamber 18 the end of the outlet opening 21 happened until the wing 14 on the front, the start end of the intake 22 achieved, an effect on the pressure peak. However, since the second restriction interval is also a very short interval, the volume of the wing chamber decreases 18 in the second constraint interval, when the radius vector at the endpoint of the start point and the endpoint of the second seal interval is shorter and it can be said that the pressure spike is likely to be caused.

In the improved construction of the vane pump 1 With adjustable flow rate, which corresponds to the first embodiment, then, since the inner peripheral surface of the cam ring 15 such a shape that the radius vector is substantially constant or becomes gradually longer in the range from the starting point to the intermediate point of the second seal interval in the minimum eccentric state as described above causes the radii at the start point and the end point of the second seal interval to be the same Approach value, the reduction in volume is limited and the pressure peak can be reduced.

Because the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, has the effect that in the maximum eccentric state, in which a shape of the inner peripheral surface of the cam ring 15 is consistent with their shape in the constant flow area, the vane separation is restricted, and in the minimum eccentric condition that is part of the variable flow range, the pressure spike is reduced, noise can occur both in the constant flow area and in the adjustable flow area be reduced.

Moreover, in the vane pump varies 1 with adjustable flow rate, which corresponds to the first embodiment, the pressure in the wing chamber 18 from the pressure on the tank to the outlet pressure in the first restriction interval and varies from outlet pressure to pressure on the tank in the second restriction interval. Since the pressure fluctuation occurs in the first restriction interval and in the second restriction interval, which are opposite, the oil pressure is generated by the pressure difference. Further, when the oil pressure on the inner peripheral surface of the cam ring 15 acts, the cam ring 15 vibrated, as a result, the variation of a flow velocity and pressure pulsation are generated and noise may be generated. Then, since the imbalance of the pressure that produces the variation of a flow velocity and the pressure pulsation can be mitigated when the plurality of odd pieces of slits 29 and the several odd pieces of wings 14 the rotor 11 be provided, the noise can be further reduced.

Further, for example, the inner peripheral surface of the cam ring 15 even in only the area from the starting point of the first sealing interval (the end of the suction opening 22 ) to its intermediate point (the intermediate point of the end of the suction opening 22 and the start end of the exhaust port 21 ) are formed in the maximum eccentric state, so that the radius vector in accordance with the rotation of the rotor 11 becomes gradually shorter, and the inner circumferential surface of the cam ring can also be in only at least part of the range from the intermediate point of the first sealing interval (the intermediate point of the end of the suction port 22 and the start end of the exhaust port 21 ) to its end point (the start end of the outlet opening 21 ) are formed in the minimum eccentric state so that the radius vector is substantially constant or in accordance with the rotation of the rotor 11 is getting longer. Such a configuration is effective for preventing noise due to pressure pulsation and vibration, especially on the side of the first sealing interval.

In addition, the inner peripheral surface of the cam ring 15 for example, only in the area from the intermediate point of the second sealing interval (the intermediate point of the end of the outlet opening 21 and the start end of the intake 22 ) to its end point (the start end of the intake 22 ) in the maximum eccentric state, so that the radius vector in accordance with the rotation of the rotor 11 becomes gradually shorter, and the inner peripheral surface of the cam ring can also only in at least a part of the range from the starting point of the second sealing interval (the end of the outlet opening 21 ) to its intermediate point (the intermediate point of the end of the outlet opening 21 and the start end of the intake 22 ) in the minimum eccentric state so that the radius vector is substantially constant or in accordance with the rotation of the rotor 11 is getting longer. Such a configuration is effective to prevent noise due to pressure pulsation and vibration, especially on the side of the second seal interval.

Second embodiment

An adjustable flow vane pump corresponding to a second embodiment is similar to the other configuration in the first embodiment except that in comparison with the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, a shaft 13 is rotationally driven by an engine of a vehicle and an inner peripheral surface of a cam ring 15 in at least part of a range from an intermediate point of a first seal interval (an intermediate point of an end of a suction port 22 and a start end of an exhaust port 21 ) to its end point (the start end of the outlet opening 21 ) is formed while the vehicle is being driven and / or at least part of a range from a starting point of a second sealing interval (an end of the exhaust port 21 ) to its intermediate point (an intermediate point of the end of the outlet opening 21 and a start end of the suction port 22 ) so that a radius vector is substantially constant or in accordance with the rotation of the rotor 11 is getting longer.

In the variable displacement vane pump corresponding to the second embodiment, in addition to the action and action by the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, a pressure peak in a wing chamber 18 reduces while the vehicle is driving, and it can be prevented that noise is generated.

Third embodiment

An adjustable flow type vane pump, which corresponds to a third embodiment, is similar to the other configuration of the first embodiment, except that in comparison with the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, a shaft 13 is rotationally driven by an engine of a vehicle and an inner peripheral surface of a cam ring 15 in at least part of a range from an intermediate point of a first seal interval (an intermediate point of an end of a suction port 22 and a start end of an exhaust port 21 ) to its end point (the start end of the outlet opening 21 When the engine speed is 1500 rpm or more every minute, and / or at least part of a range from a starting point of a second seal interval (one end of the exhaust port 21 ) to its intermediate point (an intermediate point of the end of the outlet opening 21 and a start end of the suction port 22 ), so that a radius vector is substantially constant or in accordance with the rotation of a rotor 11 is getting longer.

In the variable flow vane pump corresponding to the third embodiment, in addition to the action and action by the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, when the speed whose noise is likely to come to fruition, especially in an adjustable flow range, every minute 1500 rpm or more, a pressure peak in a wing chamber 18 limited and it can be prevented that noise arises.

Fourth embodiment

An adjustable flow vane pump corresponding to a fourth embodiment is similar to the other configuration of the first embodiment except that compared with the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, an inner peripheral surface of a cam ring 15 is formed so that in a maximum eccentric state, a range from a starting point of a first sealing interval (one end of a suction port 22 ) to its intermediate point (an intermediate point of the end of the suction port 22 and a start end of an exhaust port 21 ) and / or a range from an intermediate point of a second sealing interval (an intermediate point of an end of the exhaust port 21 and a start end of the suction port 22 ) to its end point (the start end of the intake 22 ) and / or regions in front of or behind at least one connecting to the at least one are connected by a higher order curve and the inner peripheral surface of the cam ring is formed such that in a minimum eccentric state at least a portion of a region from the intermediate point of the first sealing interval (the intermediate point of the end of the suction port 22 and the start end of the exhaust port 21 ) to its end point (the start end of the outlet opening 21 ) and / or at least part of a region from a starting point of the second sealing interval (the end of the outlet opening 21 ) to its intermediate point (the intermediate point of the end of the outlet opening 21 and the start end of the intake 22 ) and / or areas before and after at least one connected by a higher order curve.

In the variable flow vane pump corresponding to the fourth embodiment, in addition to the action and action by the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, since the inner peripheral surface of the cam ring 15 may have a smooth connected shape, the separation of the wing 14 more limited and it can be remarkably prevented from causing noise.

Fifth embodiment

10A and 10B FIG. 13 are schematic drawings showing a relative positional relationship between a rotor. FIG 11 , a cam ring 15 an outlet opening 21 and a suction port 22 with a support surface 38 show that on an adapter 12 is provided in an adjustable flow vane pump, which corresponds to a fifth embodiment of the present invention, 10A is the schematic drawing showing a maximum eccentric state, and 10B is the schematic drawing showing a minimum eccentric state. Not shown components of the variable displacement vane pump according to the fifth embodiment are the same as the components in the configuration of the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, the same reference numeral is assigned, the description is omitted and only different components are described below.

In the variable displacement vane pump corresponding to the fifth embodiment, the eccentricity between the cam ring becomes 15 and the rotor 11 by pivoting or rolling the cam ring 15 controlled in a state in which the cam ring 15 from the support surface 38 held on the side of one outlet 21 an inner peripheral surface of the adapter 12 is provided. The center Oc of an inner diameter of the cam ring 15 is designed so that it is on the side of the intake 22 away from the center of rotation Or of the rotor 11 is in an unloaded state in which the differential pressure between the pressure on the side of the suction port 22 and the pressure on the side of the outlet opening 21 not on a wave 13 , the rotor 11 and the cam ring 15 acts, and a relative position to an opening reference line Lp is on the side of the exhaust port 21 away from a relative position in the unloaded position in a state in which the shaft 13 on the side of the suction opening 22 is elastically deformed by the action of the differential pressure. Furthermore, the cam ring 15 rollable from the support surface 38 held on the side of the outlet opening 21 the inner peripheral surface of the adapter 12 is provided, and the cam ring is formed so that the center Oc of the inner diameter of the cam ring 15 on the side of the outlet opening 21 gradually separates from the opening reference line Lp when the support surface 38 in a direction from a maximum eccentric state of the cam ring 15 is rolled into a minimal eccentric state. The configuration of the other components is similar to the configuration of the other components of the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment.

In the variable flow vane pump corresponding to the fifth embodiment, in addition to the action and action by the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, since the eccentricity between the cam ring 15 and the rotor 11 through a shape of the support surface 38 can be controlled more effectively, radius vectors in a constant flow rate range and in an adjustable flow rate range, and the effect of preventing noise can be increased.

The center Oc of the inner diameter of the cam ring 15 is provided so that the relative position on the side of the suction port 22 away from the opening reference line Lp in the unloaded position in which no differential pressure acts, and on the side of the outlet opening 21 is located away from the relative position in the unloaded position in a state in which differential pressure acts, the cam ring 15 from the support surface 38 on the side of the outlet opening 21 the inner peripheral surface of the adapter 12 is provided, is held rollable, and when the cam ring is formed so that the center Oc of the inner diameter of the cam ring 15 on the side of the outlet opening 21 gradually separates from the opening reference line Lp, since the support surface 38 in the direction of the maximum eccentric state of the cam ring 15 is rolled into the minimum eccentric state, a relative position to a first sealing interval may be controlled in accordance with an operating condition.

Specifically, as in 10A shown having the maximum eccentric state, since an opening reference angle (an opening timing angle) θ, which has a relative angle between a line which is the rotational center Or of the rotor 11 and the center Oc of the inner diameter of the cam ring 15 and the opening reference line Lp is large at low speed, radius vectors in the first sealing interval tend to gradually become shorter, and thereby the separation of a sash can be more restricted.

Moreover, as in 10B shown showing the minimum eccentric state, since the opening reference angle (the opening timing angle) θ at high speed is small, the variation of the volume in the first sealing interval can be reduced and the occurrence of a pressure peak can be restricted.

Further, even if the cam ring 15 by the differential pressure between the pressure on the side of the suction port 22 and the pressure on the side of the outlet opening 21 is relatively moved, the opening reference angle (the opening timing angle) θ be optimized.

Accordingly, the above-mentioned configuration is effective as a function of preventing noise from pressure pulsation and vibration on the side of the first seal interval.

Sixth embodiment

An adjustable flow vane pump corresponding to a sixth embodiment is similar to the other configuration of the first embodiment except that in comparison with the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, an inner peripheral surface of a cam ring 15 is formed such that in a maximum eccentric state, a radius vector in accordance with the rotation of a rotor 11 in a range of a first sealing interval (a range of one end of a suction port 22 to a starting end of an outlet opening 21 ) in a rotational direction of the rotor 11 and / or a range of a second sealing interval (a range from one end of the outlet opening 21 to a starting end of the intake 22 ) gradually becomes shorter and the inner peripheral surface of the cam ring is formed so that in a minimum eccentric state the radius vector is substantially constant or in accordance with the rotation of the rotor 11 in at least part of the range of the first sealing interval (the area from the end of the suction port 22 to the start of the outlet opening 21 ) and / or at least part of the area of the second sealing interval (the area from the end of the outlet opening 21 to the start of the intake 22 ) is getting longer.

In the variable flow rate vane pump according to the sixth embodiment, in addition to the action and action by the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, since the inner peripheral surface of the cam ring 15 such a shape that the separation can be prevented in the entire area in which the separation of a wing 14 can be caused to remarkably restrict (prevent) the occurrence of noise. Incidentally, the configuration in the second embodiment, the third embodiment, and the fifth embodiment can also be applied to the variable flow vane pump corresponding to the sixth embodiment, and in that case, the effect described in each embodiment is similar to that in addition to FIG the above effects are generated.

Seventh embodiment

An adjustable flow vane pump corresponding to a seventh embodiment is similar to the other configuration of the first embodiment except that in comparison with the vane pump 1 with adjustable flow rate, which corresponds to the first embodiment, an inner peripheral surface of a cam ring 15 is formed so that in a maximum eccentric state in which the cam ring 15 from the side of a suction port 22 to the side of an outlet opening 21 because of the differential pressure between the pressure on the side of the suction port 22 and the pressure on the side of the outlet opening 21 is relatively moved, on a wave 13 , a rotor 11 and the cam ring 15 acts as compared to an unloaded position in which no differential pressure acts, a radius vector in accordance with the rotation of the rotor 11 in at least a portion of a first sealing interval (a region from an end of the suction port 22 to a starting end of the outlet opening 21 ) and / or a portion of a second sealing interval (a region from one end of the outlet opening 21 to a starting end of the intake 22 ) gradually becomes shorter and the inner circumferential surface of the cam ring is formed so that in the minimum eccentric state, the radius vector is substantially constant or in accordance with the rotation of the rotor 11 in the area of the first sealing interval (the area from the end of the suction opening 22 to the start of the outlet opening 21 ) and / or the area of the second sealing interval (the area from the end of the outlet opening 21 to the start of the intake 22 ) is getting longer.

In the variable flow vane pump according to the seventh embodiment, even if the cam ring 15 by differential pressure between the pressure on the side of the suction port 22 and the pressure on the side of the outlet opening 21 is relatively moved, a pressure pulsation in the maximum eccentric state and vibration are limited in the minimum eccentric state and the occurrence of noise can be effectively prevented. Incidentally, the configuration described in the second embodiment, the third embodiment, and the fifth embodiment can also be applied to the variable flow vane pump according to the seventh embodiment, and in that case, the effect described in each embodiment becomes produced in a similar manner in addition to the above effect.

In the foregoing, preferred embodiments of the present invention have been described, but various changes can be made thereto without departing from the scope and concept of the present invention.

Features, components and specific details of the structures of the embodiments described above may be interchanged or combined to form further embodiments optimized for the particular application. Insofar as those modifications are apparent to one of ordinary skill in the art, it is to be implied that they are disclosed by the above description without explicitly specifying each possible combination.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2002-115673 A [0002, 0004, 0006]

Claims (20)

An adjustable flow vane pump for transmitting a steering operation on a steering wheel to a steered wheel and for supplying working fluid to a steering gear for a vehicle that generates a steering assist force by hydraulic pressure of the working fluid, the vane pump ( 1 ) with adjustable flow rate comprises: a pump housing provided with a pump element storage portion; a drive shaft ( 13 ), which is connected by pins to the pump housing; a rotor provided in the pump housing ( 11 ), of the drive shaft ( 13 ) is driven in rotation and with several slots ( 29 ) is provided in the circumferential direction; several wings ( 14 ) in a freely protruding / retracting manner in the plurality of slots ( 29 ) are provided; a cam ring ( 15 ) which is designed as a ring movable on / above the pump element storage part and a plurality of pump chambers together with the rotor ( 11 ) and the multiple wings ( 14 ) forms on an inner peripheral side; and a cam ring ( 15 ) Control mechanism, which is provided on the pump housing and the eccentricity to the rotor ( 11 ) of the cam ring ( 15 ), wherein: the pump housing with a suction port ( 22 ), which is open to a region in which the volume of the plurality of pump chambers in accordance with the rotation of the rotor ( 11 ), and provided with an outlet opening to an area where the volume of the plurality of pump rooms decreases; and an inner peripheral surface of the cam ring (FIG. 15 ) is formed so that it is a state that in a maximum eccentric state in which the eccentricity ( 11 ) to the rotor ( 11 ) of the cam ring ( 15 ) is maximum, the distance to the center of rotation of the rotor in accordance with the rotation of the rotor ( 11 ) in a region of one end of the suction opening ( 22 ) to an intermediate point of the end of the suction opening ( 22 ) and a start end of the outlet opening ( 21 ) and / or an area from an intermediate point of an end of the outlet opening ( 21 ) and a start end of the intake opening ( 22 ) to the start end of the intake opening ( 22 ) in a direction of rotation of the rotor ( 11 ) gradually becomes shorter, and the inner peripheral surface of the cam ring ( 15 ) is formed so that it is a state that in a minimum eccentric state in which the eccentricity to the rotor ( 11 ) of the cam ring ( 15 ) is minimal, the distance to the center of rotation of the rotor ( 11 ) is substantially constant or in accordance with the rotation of the rotor ( 11 ) in at least part of a region from the intermediate point of the end of the suction port ( 22 ) and the start end of the outlet ( 21 ) to the start end of the outlet opening ( 21 ) and / or at least part of an area from the end of the outlet opening ( 21 ) to the intermediate point of the end of the outlet opening ( 21 ) and the start end of the intake opening ( 22 ) is getting longer. An adjustable flow vane pump according to claim 1, wherein: 13 ) is rotationally driven by an engine of the vehicle; and the inner circumferential surface of the cam ring ( 15 ) is formed to be a state that, when the vehicle is being driven, the distance to the rotation center of the rotor ( 11 ) is substantially constant or in accordance with the rotation of the rotor ( 11 ) in at least a part of the area from the intermediate point of the end of the suction opening ( 22 ) and the start end of the outlet ( 21 ) to the start end of the outlet opening ( 21 ) and / or at least part of the area from the end of the outlet opening ( 21 ) to the intermediate point of the end of the outlet opening ( 21 ) and the start end of the intake opening ( 22 ) is getting longer. An adjustable flow vane pump according to claim 1, wherein: 13 ) is rotationally driven by the engine of the vehicle; and the inner circumferential surface of the cam ring ( 15 is configured to be a state that when the engine speed is 1500 rpm or more every minute, the distance to the rotation center of the rotor (FIG. 11 ) is substantially constant or in accordance with the rotation of the rotor ( 11 ) in at least a part of the area from the intermediate point of the end of the suction opening ( 22 ) and the Start end of the outlet opening ( 21 ) to the start end of the outlet opening ( 21 ) and / or at least part of the area from the end of the outlet opening ( 21 ) to the intermediate point of the end of the outlet opening ( 21 ) and the start end of the intake opening ( 22 ) is getting longer. The variable flow vane pump of claim 1, wherein: the inner peripheral surface of the cam ring 15 ) is designed to be a state that in the maximum eccentric state the area from the end of the suction opening ( 22 ) to the intermediate point of the end of the suction opening ( 22 ) and the start end of the outlet ( 21 ) and / or the area from the intermediate point of the end of the outlet opening ( 21 ) and the start end of the intake opening ( 22 ) to the start end of the intake opening ( 22 ) and / or regions before and after at least one connected to at least one are connected by a higher order curve; and the inner circumferential surface of the cam ring ( 15 is designed to be a state that in the minimum eccentric state, the area from the intermediate point of the end of the suction port ( 22 ) and the start end of the outlet ( 21 ) to the start end of the outlet opening ( 21 ) and / or the area from the end of the outlet ( 21 ) to the intermediate point of the end of the outlet opening ( 21 ) and the start end of the intake opening ( 22 ) and / or regions before and after at least one connected to at least one are connected by the higher order curve. The variable flow vane pump of claim 1, wherein: the inner peripheral surface of the cam ring 15 ) is designed to be a state that in the minimum eccentric state the distance to the center of rotation of the rotor ( 11 ) in accordance with the rotation of the rotor ( 11 ) in at least a part of the area from the intermediate point of the end of the suction opening ( 22 ) and the start end of the outlet ( 21 ) to the start end of the outlet opening ( 21 ) and / or at least part of the area from the end of the outlet opening ( 21 ) to the intermediate point of the end of the outlet opening ( 21 ) and the start end of the intake opening ( 22 ) is getting longer. An adjustable flow rate vane pump according to at least one of claims 1 to 5, wherein: the eccentricity to the rotor ( 11 ) of the cam ring ( 15 ) by pivoting or rolling the cam ring ( 15 ) is controlled in a state in which the cam ring ( 15 ) is supported by a support surface which on one side of the outlet opening ( 21 ) is provided an inner peripheral surface of the pump element storage part. An adjustable flow vane pump according to claim 6, wherein: the center of an inner diameter of said cam ring ( 15 ) on the side of the suction opening ( 22 ) away from the center of the rotor ( 11 ) is in a non-loaded position in which a differential pressure between the pressure on the side of the suction port ( 22 ) and the pressure on the side of the outlet opening ( 21 ) not on the drive shaft ( 13 ), the rotor ( 11 ) and the cam ring ( 15 ), and is in a state in which the drive shaft ( 13 ) on the side of the suction opening ( 22 ) is elastically deformed by the action of the differential pressure, a relative position of the center of the inner diameter of the cam ring ( 15 ) to an opening reference line on the side of the outlet opening (FIG. 21 ) is away from a relative position in the unloaded position; the cam ring ( 15 ) is rollably supported by a support surface located on the side of the outlet opening ( 21 ) is provided on the inner peripheral surface of the pump element storage part; and the support surface is adapted to be a state that, when the cam ring 15 ) is rolled in a direction from the maximum eccentric state to the minimum eccentric state, the center of the inner diameter of the cam ring ( 15 ) on the side of the outlet opening ( 21 ) gradually separates from the opening reference line. The variable flow vane pump of claim 1, wherein: the inner peripheral surface of the cam ring 15 ) is designed to be a state that in the maximum eccentric state the distance to the center of rotation of the rotor ( 11 ) in accordance with the rotation of the rotor ( 11 ) in the region from the end of the suction opening ( 22 ) to the intermediate point of the end of the suction opening ( 22 ) and the start end of the outlet opening in a direction of rotation of the rotor ( 11 ) gradually becomes shorter; and the inner circumferential surface of the cam ring ( 15 ) is designed to be a state that in the minimum eccentric state the distance to the center of rotation of the rotor ( 11 ) is substantially constant or in accordance with the rotation of the rotor ( 11 ) in at least a part of the area from the intermediate point of the end of the suction opening ( 22 ) and the start end of the outlet ( 21 ) to the start end of the outlet opening ( 21 ) is getting longer. The variable flow vane pump of claim 8, wherein: the inner peripheral surface of the cam ring 15 ) is designed to be a state that in the maximum eccentric state the distance to the center of rotation of the rotor ( 11 ) in accordance with the rotation of the rotor ( 11 ) in the area from the end of the suction opening ( 22 ) to the intermediate point of the end of the suction opening ( 22 ) and the start end of the outlet ( 21 ) and in the area from the intermediate point of the end of the outlet opening ( 21 ) and the start end of the intake opening ( 22 ) to the start end of the intake opening ( 22 ) in the direction of rotation of the rotor ( 11 ) gradually becomes shorter; and the inner circumferential surface of the cam ring ( 15 ) is designed to be a state that in the minimum eccentric state the distance to the center of rotation of the rotor ( 11 ) is substantially constant or in accordance with the rotation of the rotor ( 11 ) in at least a part of the area from the intermediate point of the end of the suction opening ( 22 ) and the start end of the outlet ( 21 ) to the start end of the outlet opening ( 21 ) and in at least part of the area from the end of the outlet opening ( 21 ) to the intermediate point of the end of the outlet opening ( 21 ) and the start end of the intake opening ( 22 ) is getting longer. An adjustable flow rate vane pump according to at least one of claims 1 to 9, wherein: the rotor ( 11 ) the several odd pieces of slots ( 29 ) and the several odd pieces of wings ( 14 ) to be provided. An adjustable flow vane pump for transmitting a steering operation on a steering wheel to a steered wheel and for supplying a working fluid to a steering gear for a vehicle that generates a steering assist force by hydraulic pressure of the working fluid, the vane pump ( 1 ) with adjustable flow rate comprises: a pump housing provided with a pump element storage portion; a drive shaft ( 13 ), which is connected by pins to the pump housing; a rotor provided in the pump housing ( 11 ), of the drive shaft ( 13 ) is driven in rotation and with several slots ( 29 ) is provided in the circumferential direction; several wings ( 14 ) in a freely protruding / retracting manner in the plurality of slots ( 29 ) are provided; a cam ring ( 15 ) which is designed as a ring movable on / above the pump element storage part and a plurality of pump chambers together with the rotor ( 11 ) and the multiple wings ( 14 ) forms on an inner peripheral side; and a cam ring ( 15 ) Control mechanism, which is provided on the pump housing and the eccentricity to the rotor ( 11 ) of the cam ring ( 15 ), wherein: the pump housing with a suction port ( 22 ), which is open to a region in which the volume of the plurality of pump chambers in accordance with the rotation of the rotor ( 11 ) and with an outlet opening ( 21 ) open to an area where the volume of the plurality of pump rooms decreases; and an inner peripheral surface of the cam ring (FIG. 15 ) is formed so that it is a state that in a maximum eccentric state in which the eccentricity ( 11 ) to the rotor ( 11 ) of the cam ring ( 15 ) is maximum, the distance to the center of rotation of the rotor in accordance with the rotation of the rotor ( 11 ) in a region of one end of the suction opening ( 22 ) to a starting end of the outlet opening ( 21 ) in a direction of rotation of the rotor ( 11 ) and / or a region from one end of the outlet opening (FIG. 21 ) to a starting end of the suction opening ( 22 ) gradually becomes shorter, and the inner peripheral surface of the cam ring ( 15 ) is adapted to be a state that in a minimum eccentric state in which the eccentricity to the rotor ( 11 ) of the cam ring ( 15 ) is minimal, the distance to the center of rotation of the rotor ( 11 ) is substantially constant or in accordance with the rotation of the rotor ( 11 ) in at least part of the area from the end of the suction opening ( 22 ) to the start end of the outlet opening ( 21 ) and / or at least part of the area from the end of the outlet opening ( 21 ) to the start end of the intake opening ( 22 ) is getting longer. The variable flow vane pump of claim 11, wherein: 13 ) is rotationally driven by an engine of the vehicle; and the inner circumferential surface of the cam ring ( 15 ) is designed to be a condition that, when the vehicle is being driven, the distance to the center of rotation of the rotor ( 11 ) is substantially constant or in accordance with the rotation of the rotor ( 11 ) in at least part of the area from the end of the suction opening ( 22 ) to the start end of the outlet opening ( 21 ) and / or at least part of the area from the end of the outlet opening ( 21 ) to the start end of the intake opening ( 22 ) is getting longer. The variable flow vane pump of claim 11, wherein: 13 ) is rotationally driven by the engine of the vehicle; and the inner circumferential surface of the cam ring ( 15 is configured to be a state that when the engine speed is 1500 rpm or more every minute, the distance to the rotation center of the rotor (FIG. 11 ) is substantially constant or in accordance with the rotation of the rotor ( 11 ) in at least part of the area from the end of the suction opening ( 22 ) to the start end of the outlet opening ( 21 ) and / or at least part of the area from the end of the outlet opening ( 21 ) to the start end of the intake opening ( 22 ) is getting longer. An adjustable flow vane pump according to at least one of claims 11 to 13, wherein: the eccentricity to the rotor ( 11 ) of the cam ring ( 15 ) by pivoting or rolling the cam ring ( 15 ) is controlled in a state in which the cam ring ( 15 ) is supported by a support surface which on one side of the outlet opening ( 21 ) is provided an inner peripheral surface of the pump element storage part. An adjustable flow vane pump according to claim 14, wherein: the center of an inner diameter of the cam ring ( 15 ) on the side of the suction opening ( 22 ) is based on an opening reference line which has an intermediate point of the end of the suction opening ( 22 ) with the start end of the outlet opening ( 21 ) and the center of the rotor ( 11 ) in an unloaded position, in which a differential pressure between the pressure on the side of the suction port ( 22 ) and the pressure on the side of the outlet opening ( 21 ) not on the drive shaft ( 13 ), the rotor ( 11 ) and the cam ring ( 15 ) and a relative position of the center of the inner diameter of the cam ring ( 15 ) based on the opening reference line in a state in which the drive shaft ( 13 ) on the side of the suction opening ( 22 ) is elastically deformed by the action of the differential pressure, on the side of the outlet opening ( 21 ) away from a relative position in the unloaded position; the cam ring ( 15 ) is held rollably by a support surface which is located on the side of the outlet opening ( 21 ) is provided on the inner peripheral surface of the pump element storage part; and the support surface is adapted to be a state that, since the cam ring ( 15 ) is rolled in a direction from the maximum eccentric state to the minimum eccentric state, the center of the inner diameter of the cam ring ( 15 ) gradually separates from the opening reference line. An adjustable flow vane pump for transmitting a steering operation on a steering wheel to a steered wheel and supplying working fluid to a steering gear for a vehicle that generates a steering assist force by the hydraulic pressure of the working fluid, the vane pump ( 1 variable flow rate flow rate meter comprises: a pump housing provided with a pump element storage portion; a drive shaft ( 13 ), which is connected by pins to the pump housing; a rotor provided in the pump housing ( 11 ), of the drive shaft ( 13 ) is driven in rotation and with several slots ( 29 ) is provided in the circumferential direction; several wings ( 14 ) in a freely protruding / retracting manner in the plurality of slots ( 29 ) are provided; a cam ring ( 15 ) which is designed as a ring movable on / above the pump element storage part and a plurality of pump chambers together with the rotor ( 11 ) and the multiple wings ( 14 ) forms on an inner peripheral side; and a cam ring ( 15 ) Control mechanism, which is provided on the pump housing and the eccentricity to the rotor ( 11 ) of the cam ring ( 15 ), wherein: the pump housing with a suction port ( 22 ), which is open to a region in which the volume of the plurality of pump chambers in accordance with the rotation of the rotor ( 11 ) and with an outlet opening ( 21 ) open to an area where the volume of the plural pump rooms decreases; and an inner peripheral surface of the cam ring (FIG. 15 ) is formed so as to be a state that in a state in which the cam ring ( 15 ) by the effect of the differential pressure between the pressure on the side of the suction port ( 22 ) and the pressure on the side of the outlet opening ( 21 ) on the drive shaft ( 13 ), the rotor ( 11 ) and the cam ring ( 15 ) from the side of the suction opening ( 22 ) to the side of the outlet opening ( 21 ) is relatively moved, compared to an unloaded position in which no differential pressure acts, and in a maximum eccentric state in which the eccentricity to the rotor ( 11 ) of the cam ring ( 15 ) is maximum, the distance to the center of rotation of the rotor ( 11 ) in accordance with the rotation of the rotor ( 11 ) in a region of one end of the suction opening ( 22 ) to a starting end of the outlet opening ( 21 ) and / or a region from one end of the outlet opening (FIG. 21 ) to a starting end of the suction opening ( 22 ) in the direction of rotation of the rotor ( 11 ) gradually becomes shorter, and the inner peripheral surface of the cam ring ( 15 ) is adapted to be a state that in a minimum eccentric state in which the eccentricity to the rotor ( 11 ) of the cam ring ( 15 ) is minimal, the distance to the center of rotation of the rotor ( 11 ) is substantially constant or in accordance with the rotation of the rotor ( 11 ) in at least part of the area from the end of the suction opening ( 22 ) to the start end of the outlet opening ( 21 ) and / or at least part of the area from the end of the outlet opening ( 21 ) to the start end of the intake opening ( 22 ) is getting longer. The variable flow vane pump of claim 16, wherein: 13 ) is rotationally driven by an engine of the vehicle; and the inner circumferential surface of the cam ring ( 15 ) is designed to be a condition that, when the vehicle is being driven, the distance to the center of rotation of the rotor ( 11 ) is substantially constant or in accordance with the rotation of the rotor ( 11 ) in at least part of the area from the end of the suction opening ( 22 ) to the start end of the outlet opening ( 21 ) and / or at least part of the area from the end of the outlet opening ( 21 ) to the start end of the intake opening ( 22 ) is getting longer. The variable flow vane pump of claim 16, wherein: 13 ) is rotationally driven by the engine of the vehicle; and the inner circumferential surface of the cam ring ( 15 is configured to be a state that when the engine speed is 1500 rpm or more every minute, the distance to the rotation center of the rotor (FIG. 11 ) is substantially constant or in accordance with the rotation of the rotor ( 11 ) in at least part of the area from the end of the suction opening ( 22 ) to the start end of the outlet opening ( 21 ) and / or at least part of the area from the end of the outlet opening ( 21 ) to the start end of the intake opening ( 22 ) is getting longer. An adjustable flow vane pump according to any one of claims 16 to 18, wherein: the eccentricity to the rotor ( 11 ) of the cam ring ( 15 ) by pivoting or rolling the cam ring ( 15 ) is controlled in a state in which the cam ring ( 15 ) is supported by a support surface which on one side of the outlet opening ( 21 ) one Inner peripheral surface of the pump element storage part is provided. The variable flow vane pump of claim 19, wherein: the center of an inner diameter of the cam ring 15 ) on the side of the suction opening ( 22 ) is based on an opening reference line which has an intermediate point of the end of the suction opening ( 22 ) with the start end of the outlet opening ( 21 ) and the center of the rotor ( 11 ) in an unloaded state in which a differential pressure between the pressure on the side of the suction port ( 22 ) and the pressure on the side of the outlet opening ( 21 ) not on the drive shaft ( 13 ), the rotor ( 11 ) and the cam ring ( 15 ) and a relative position based on the opening reference line in a state in which the drive shaft (FIG. 13 ) on the side of the suction opening ( 22 ) is elastically deformed by the action of the differential pressure, on the side of the outlet opening ( 21 ) is away from a relative position in the unloaded position; the cam ring ( 15 ) is held rollably by the support surface located on the side of the outlet opening ( 21 ) is provided on the inner peripheral surface of the pump element storage part; and the support surface is adapted to be a state that, since the cam ring ( 15 ) is rolled in a direction from the maximum eccentric state to the minimum eccentric state, the center of the inner diameter of the cam ring ( 15 ) gradually separates from the opening reference line.

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