JP2023125377A - oil lubrication device - Google Patents

Abstract

To provide a vane pump capable of preventing performance deterioration due to pressure leakage while efficiently discharging mixed air.SOLUTION: A vane pump 100 according to the present invention includes a rotor 120 rotatably disposed in an internal space of a cam ring 110, a plurality of vanes 140, two side plates 200, 300 sandwiching both side surfaces of the rotor, and a suction port 210 and a discharge port 220 formed on the side plate. In the rotor, one or a plurality of air storage holes 124 penetrating through both side surfaces of the rotor is formed between the adjacent vanes, and on the two side plates, air guide grooves 234, 334 communicating a pump chamber with the air storage hole are formed in a downstream side of the suction port. The air storage hole is communicated with the discharge port.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vane pump that supplies cooling oil or lubricating oil to various machines.

Vane pumps are used as an oil supply source for cooling and lubrication systems that supply cooling oil to vehicle drive motors, lubricating oil to bearings, and lubricating oil to gears such as reducers and differential gears. It is used.

A vane pump consists of a cam ring, a rotor placed inside the cam ring and rotated by a power source, and a plurality of slits formed radially on the outer circumferential surface of the rotor. and adjacent vanes forming a plurality of pump chambers.

As shown in Patent Document 1, in a vane pump, when a pump chamber that sucks hydraulic oil from an inlet port communicates with a discharge port, the pressure inside the pump chamber suddenly increases and air bubbles mixed in the hydraulic oil are crushed. There is a problem in that the impact causes noise and erosion. Patent Document 1 proposes a configuration in which a flow path is formed in a vane to release pressure in a pump chamber (pump chamber) to a back pressure chamber. Patent Document 1 states that this eliminates pressure warping and provides a high impact reduction effect.

Patent Document 2 proposes a configuration in which a vane chamber drain passage that communicates the vane chamber with the outside of the vane pump is formed in a transition region where the vane chamber (pump chamber) transitions from the discharge region to the suction region. This prevents air compressed by the vane chamber from being carried along with the working fluid to the suction area, allowing the working fluid to be drawn in smoothly in the suction area and maintaining the suction performance of the vane pump. .

JP 2021-148113 Publication Patent No. 5597530

However, when the vane pump rotates, the hydraulic oil is heavier than air bubbles, so the centrifugal force causes the hydraulic oil to collect on the cam ring side (outside) of the pump chamber, and air bubbles form on the rotor side (inside: rotor outer circumferential surface) of the pump chamber. get together. In the configuration of Patent Document 1, since the flow path is provided in the vane, it is difficult to discharge the air accumulated inside the vane opening (front recess 61) when there is a large amount of air in the hydraulic oil. There's a problem.

In the configuration of Patent Document 2, since the hydraulic oil mixed with air bubbles is discharged in the transition area that transitions from the discharge area to the suction area, noise and erosion during discharge cannot be eliminated. In addition, additional drain piping is required to guide the oil discharged from the vane chamber drain passage, and the discharged oil is supplied from the pump chamber of the adjacent discharge process, leading to pressure leaks and volumetric efficiency. There is a problem in that it causes a decrease in performance.

SUMMARY OF THE INVENTION In view of these problems, an object of the present invention is to provide a vane pump that efficiently discharges mixed air and does not cause performance deterioration due to pressure leakage.

In order to solve the above problems, a typical configuration of a vane pump according to the present invention includes a cam ring, a rotor that is rotatably arranged in the internal space of the cam ring and has a plurality of slits formed on its outer circumferential surface, and an inner space of the cam ring. Adjacent vanes that are arranged so as to be able to advance and retreat through multiple slits so as to contact the circumferential surface of the rotor to form multiple pump chambers, two side plates that sandwich both sides of the rotor, and a suction formed on the side plates. A vane pump having a port and a discharge port, the rotor having one or more air storage holes formed between adjacent vanes passing through both sides of the rotor, and two side plates having a suction port. An air guide groove is formed on the downstream side of the pump chamber to communicate the air storage hole with the pump chamber, and the air storage hole communicates with the discharge port.

Furthermore, it is preferable that a pressure release groove is formed in the two side plates on the upstream side of the suction port to communicate the pump chamber with the air storage hole.

Preferably, the discharge port is formed with an expanded portion that communicates with the air storage hole, and the expanded portion is formed at a position where the pump chamber communicates with the air storage hole after the pump chamber communicates with the discharge port.

According to the present invention, it is possible to provide a vane pump that efficiently discharges mixed air and does not cause performance deterioration due to pressure leakage.

It is an exploded perspective view explaining the composition of the vane pump concerning this embodiment. It is a figure explaining each component. FIG. 3 is a diagram illustrating the functions of an air storage hole, an air guide groove, and a pressure release groove.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely illustrative to facilitate understanding of the invention, and do not limit the invention unless otherwise specified. In this specification and the drawings, elements with substantially the same functions and configurations are given the same reference numerals to omit redundant explanation, and elements not directly related to the present invention are omitted from illustration. do.

FIG. 1 is an exploded perspective view illustrating the configuration of a vane pump 100 according to this embodiment. A vane pump 100 shown in FIG. 1 is used as an oil supply source to parts that require cooling or lubrication in an automobile. The vane pump 100 includes a cam ring 110 having an internal space, and a cylindrical rotor 120 rotatably disposed in the internal space of the cam ring 110.

A shaft 130 is inserted into the center of the rotor 120, and the rotor 120 is coupled to the shaft 130 so that the rotor 120 can rotate integrally with the shaft 130 in the circumferential direction. A plurality of radially formed slits 122 are arranged on the outer peripheral surface of the rotor 120 at equal intervals in the circumferential direction. A vane 140 is accommodated in each slit 122 so as to be movable in the radial direction. By protruding, the vane 140 comes into contact with the inner peripheral surface of the cam ring 110 and slides thereon.

The cam ring 110 has an internal space 112 that is approximately elliptical in side view. The internal space 112 is continuously formed into a portion close to the rotor 120 and a portion spaced apart from the rotor 120 every 180 degrees in the rotational direction of the rotor 120. Both axial ends of the internal space 112 are covered by a first side plate 200 and a second side plate 300. Therefore, when the rotor 120 rotates, the vanes 140 come into contact with the inner peripheral surface of the cam ring 110 due to centrifugal force, and the adjacent pair of vanes 140, the outer peripheral surface of the rotor 120, the inner peripheral surface of the cam ring 110, and the first side plate 200 and A plurality of pump chambers 150 are formed separated by the second side plate 300. Holes 202 and 302 through which the shaft 130 passes are formed in the first side plate 200 and the second side plate 300.

2A and 2B are diagrams for explaining each component, in which FIG. 2A is a front view showing the sliding surface of the first side plate 200, FIG. 2B is a front view of the cam ring 110 and rotor 120, and FIG. 3 is a rear view showing the sliding surface of the second side plate 300. FIG. It should be noted that FIG. 2(c) is shown upside down to show the sliding surface on which the rotor 120 slides.

As shown in FIG. 2(a), the first side plate 200 is a disc-shaped member, and has two suction ports 210 and two discharge ports 220 sandwiching the long axis direction of the ellipse of the internal space. The two suction ports 210 are each connected to an oil passage connected to an oil reservoir (not shown). The two discharge ports 220 supply cooling oil to the motor for driving the vehicle through oil passages (not shown), lubricating oil to bearings in the vehicle, and gears such as reduction gears and differential gears of wheels. supply lubricating oil to

As shown in FIG. 2(b) and FIG. 1, a suction groove 114 is formed in the cam ring 110 at a position corresponding to the suction port 210. The suction grooves 114 are formed on both sides of the first side plate 200 and the second side plate 300, so a total of four suction grooves 114 are formed.

As shown in FIG. 2(c), the second side plate 300 is a disc-shaped member. Two cutout-shaped suction ports 310 are provided at positions corresponding to the suction ports 210 of the first side plate 200. Furthermore, the sliding surface shown in FIG. 2(c) is provided with two recesses 320 at positions corresponding to the discharge ports 220 of the first side plate 200. That is, the second side plate 300 does not have a discharge port, and the hydraulic oil is discharged from the discharge port 220 of the first side plate 200.

The basic operation of vane pump 100 will be explained. The rotor 120 rotates so that the vanes 140 move from the suction ports 210 and 310 toward the discharge port 220. In other words, the suction ports 210 and 310 are located on the upstream side with respect to the rotational direction of the rotor 120, and the discharge port 220 is located on the downstream side. As the rotor 120 rotates, oil is introduced from the suction ports 210, 310 as the volume of the pump chamber 150 increases at the suction ports 210, 310. Thereafter, as the volume of the pump chamber 150 decreases at the position of the discharge port 220, oil is delivered from the discharge port 220.

Here, one or more air storage holes 124 are formed in the rotor 120, passing through both side surfaces of the rotor 120 between adjacent vanes 140 (pump chamber 150). In the figure, the air storage holes 124 are shown to be formed between all the vanes 140 (all the pump chambers 150), but the number of air storage holes 124 can be set as appropriate. For example, there may be only one in total, two may be arranged at 180 degree positions, or they may be arranged every other place.

That is, the air storage hole 124 is open on the side surface of the rotor 120, and since the side surface of the rotor 120 is a surface that slides on the first side plate 200 or the second side plate 300, the hydraulic oil actively flows therein. It is not possible. Therefore, in the first side plate 200, a pressure release groove 232 and an air guide groove 234 are formed to communicate the pump chamber 150 and the air storage hole 124. A pressure release groove 232 is formed on the upstream side of the suction port 210, and an air guide groove 234 is formed on the downstream side of the suction port 210. Similarly, in the second side plate 300, a pressure release groove 332 is formed on the upstream side of the suction port 310, and an air guide groove 334 is formed on the downstream side of the suction port 310.

The discharge port 220 has an expanded portion 222 that projects radially inward from the downstream end of the discharge port 220 and communicates with the air storage hole 124 . Similarly, the concave portion 320 also has an expanded portion 322 that protrudes radially inward from the downstream end of the concave portion 320 and communicates with the air storage hole 124 . The extensions 222, 322 are in corresponding positions (opposing positions). That is, the expanded portions 222, 322 are formed at positions where the expanded portions 222, 322 communicate with the air storage hole 124 after the pump chamber 150 communicates with the discharge port 220. Note that the discharge ports 220 and 320 may be simply widened inward to communicate with (overlap with) the air storage hole 124.

FIG. 3 is a diagram illustrating the functions of the air storage hole 124, the pressure release grooves 232, 332, and the air guide grooves 234, 334. 3(a), (c), and (e), the air storage hole 124, pressure release grooves 232, 332, and air guide grooves 234, 334 are hatched to make them easier to see. This is to do so. In FIGS. 3(b), 3(d), and 3(f), hatching on the cam ring 110, rotor 120, first side plate 200, and second side plate 300 indicates a cross section.

FIG. 3(a) is a diagram illustrating the suction process, and FIG. 3(b) is a sectional view taken along line PP in FIG. 3(a). The suction process is a process when the pump chamber 150 is located between the short axis direction and the long axis direction of the ellipse of the internal space 112 of the cam ring 110.

First, the inside of the air storage hole 124 has the pressure (discharge pressure) of the previous stage discharge process, so the pressure is high. When the rotor 120 rotates to the left in the figure, the pump chamber 150 communicates with the air storage hole 124 via the pressure release grooves 232, 332, since the pressure release grooves 232, 332 are formed on the upstream side of the suction port. Subsequently, the pump chamber 150 and the suction port 210 communicate with each other.

As the volume of the pump chamber 150 increases, the pressure decreases (suction pressure: negative pressure), and hydraulic oil is sucked from the suction port 210. At this time, it is assumed that air bubbles are mixed into the hydraulic oil sucked from the suction port 210. Since the suction pressure is lower than the pressure inside the air storage hole 124 (discharge pressure), the pressure inside the air storage hole 124 also decreases as shown in FIG. 3(b). When the pump chamber 150 passes through the pressure relief grooves 232, 332, communication between the pump chamber 150 and the air reservoir hole 124 is lost.

FIG. 3(c) is a diagram illustrating the compression stroke, and FIG. 3(d) is a sectional view taken along the line QQ in FIG. 3(c). The compression stroke is a process in which the pump chamber 150 is located between the long axis direction of the ellipse of the internal space 112 of the cam ring 110 and the short axis thereof until it reaches the discharge port 220.

When the pump chamber 150 passes through the longitudinal direction of the internal space 112 as the rotor 120 rotates, the volume of the pump chamber 150 decreases and the pressure within the pump chamber 150 increases (compression pressure). At this time, due to centrifugal force, hydraulic oil collects on the cam ring 110 side (outside) of the pump chamber 150, and air bubbles collect on the rotor 120 side (inside: rotor outer peripheral surface) of the pump chamber 150. When the pump chamber 150 reaches the air guide grooves 234 and 334, the pump chamber 150 and the air storage hole 124 communicate with each other via the air guide grooves 234 and 334. Since the pump chamber 150 has a high compression pressure and the air storage hole 124 has a low suction pressure, as shown in FIG. 124. The inside of the air storage hole 124 becomes compressed pressure.

FIG. 3(e) is a diagram illustrating the discharge process, and FIG. 3(f) is a sectional view taken along the line SS in FIG. 3(e). The discharge process is a process while the pump chamber 150 is communicating with the discharge port 220.

The discharge pressure is lower than the compression pressure, and when the pump chamber 150 and the discharge port 220 communicate with each other, the hydraulic oil in the pump chamber 150 is discharged from the discharge port 220. At this time, since the pressure in the air storage hole 124 was also compressed pressure, the hydraulic fluid mixed with air bubbles inside the air storage hole 124 was moved to the discharge port 222 due to the pressure difference and the discharge flow, as shown in FIG. 3(f). is discharged from.

As described above, even if air bubbles are mixed into the hydraulic fluid from the suction port 210, they can be temporarily stored in the air storage hole 124 and then discharged from the discharge port 220. Since air flows into the air storage hole 124 from the rotor 120 side (the outer circumferential surface of the rotor 120) of the pump chamber 150, air bubbles do not accumulate on the outer circumferential surface of the rotor 120 compared to Patent Document 1. Therefore, air can be efficiently discharged. Furthermore, compared to Patent Document 2, no additional drain piping is required, and since the structure is not such that the discharge is further discharged after discharge, there is no possibility of deterioration in performance due to pressure leakage. Therefore, it is possible to provide a vane pump that efficiently discharges the mixed air and does not cause performance deterioration due to pressure leakage.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the claims, and these naturally fall within the technical scope of the present invention. Understood.

INDUSTRIAL APPLICATION This invention can be utilized as a vane pump which supplies cooling oil or lubricating oil to various machines.

100... Vane pump, 110... Cam ring, 112... Internal space, 114... Suction groove, 120... Rotor, 122... Slit, 124... Air storage hole, 130... Shaft, 140... Vane, 150... Pump chamber, 200... First side Plate, 202...hole, 210...intake port, 220...discharge port, 222...extended portion, 232...pressure release groove, 234...air guide groove, 300...second side plate, 302...hole, 310...intake port, 320 ... recessed part, 322... expanded part, 332... pressure release groove, 334... air guide groove

Claims (3)

cam ring and
a rotor rotatably disposed in the internal space of the cam ring and having a plurality of slits formed on its outer peripheral surface;
Adjacent vanes that are arranged to be movable in and out of the plurality of slits and form a plurality of pump chambers so as to come into contact with the inner circumferential surface of the cam ring;
two side plates sandwiching both sides of the rotor;
an inlet and an outlet formed in the side plate;
A vane pump having
The rotor is formed with one or more air storage holes passing through both side surfaces of the rotor between the adjacent vanes,
An air guide groove is formed in the two side plates on the downstream side of the suction port to communicate the pump chamber with the air storage hole,
The vane pump, wherein the air storage hole communicates with the discharge port. 2. The vane pump according to claim 1, further comprising a pressure release groove formed in the two side plates upstream of the suction port to communicate the pump chamber with the air storage hole. The discharge port is formed with an expanded portion that communicates with the air storage hole,
3. The vane pump according to claim 1, wherein the expanded portion is formed at a position where the pump chamber communicates with the air storage hole after communicating with the discharge port.

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