KR20220082709A - Pump - Google Patents

Abstract

The present invention relates to a pump, and relates to a pump, comprising: a pump housing including a rotor chamber; an inner rotor disposed on the central side of the rotor chamber, to which a shaft connected to a driving unit is coupled to the central portion; An outer rotor in which the inner rotor is disposed in the central portion, and a friction surface reducing portion formed on a friction surface between the rotor chamber and the outer rotor in order to reduce friction between the rotor chamber and the outer rotor. According to , a part of the fluid pressurized into the friction surface reducing part is introduced to reduce and lubricate the friction surface between the outer rotor body and the rotor chamber to smooth the rotation of the outer rotor, so the effect of improving the pumping performance is expected can

Description

pump {PUMP}

The present invention relates to a pump, and more particularly, to a pump having improved pumping performance by reducing and lubricating the friction surface between the outer rotor and the rotor chamber to smooth the rotation of the outer rotor.

An oil pump refers to a device that sucks up oil in an oil tank and pumps it to each moving part of a mechanical device such as a transmission. In particular, an oil pump applied to a vehicle may be operated by being connected to a transmission device such as a motor or connected to a mechanical device such as a crankshaft, camshaft, and power belt.

Such an oil pump may be classified into a rotary pump, a gear pump, a plunger pump, a vane pump, and the like according to an operation method. And the oil stored in the oil tank can lubricate various bearings, pistons, shafts, and valve systems through the filter.

Here, in the rotary pump, the inner rotor and outer rotor move relative to each other according to the rotation of the shaft. Oil is sucked or pumped.

Specifically, the rotary pump is also called a rotary pump and was devised by Gede in 1905. The rotor, corresponding to the piston of the reciprocating pump, rotates, and the liquid is transported by the rotation of the rotor without suction/discharge valves. It is suitable for the case requiring a small flow rate and high pressure lift, and the structure is simple and easy to handle. As it continuously transports the fluid, the delivery volume does not pulsate like a general reciprocating pump. Although it is less efficient than a reciprocating pump, it is suitable for transporting oily or sticky fluids and can also be used as a hydraulic pump.

Rotary pumps are largely divided into gear pumps and vane pumps. Here, in the gear pump, the gear teeth meshing with each other in the pump casing are separated from each other on the inlet side, and the fluid is sucked at the end of the gear, and this fluid is sent to the outlet side as the gear rotates. Gears are usually spur gears and lobe gears.

13 shows one form of the outer rotor 10 used in the conventional gear type oil pump. One form of the conventional outer rotor 10 is in the form of a spur gear, and the inner rotor is disposed in the ring-shaped rotor body 11 and the inner opening 12 of the rotor body 11, and the inner periphery of the opening 12 is Gear teeth in which a plurality of teeth 14 and grooves 15 are alternately formed along the circumferential direction are machined. It engages with the gear teeth of the inner rotor disposed in the opening 12 and pressurizes the sucked oil to send it out.

The outer rotor 10 is disposed in the rotor chamber of the pump, and the inner surface of the rotor chamber and the surface of the outer rotor 10 generally form a friction surface. Accordingly, when the outer rotor 10 rotates, friction with the inner surface of the rotor chamber may occur, and a phenomenon such as wear may occur.

At this time, the surface of the outer rotor 10 and the inner surface of the rotor chamber are not lubricated smoothly, which also provides a cause that the driving torque of the rotary pump itself is not constant. In this case, the rotation of the outer rotor 10 is not smooth, which may cause a problem in which the pump performance is deteriorated.

Korean Patent Publication No.: 10-2021-0002538A

The present invention has been devised to solve the problems of the related art as described above, and an object of the present invention is to improve the pumping performance by reducing and lubricating the friction surface between the outer rotor and the rotor chamber to smooth the rotation of the outer rotor. It is to provide a pump that can

A pump according to the present invention for achieving the above objects includes: a pump housing including a rotor chamber; an inner rotor disposed on the central side of the rotor chamber, the central part having a shaft connected to the driving unit coupled thereto; and an outer rotor disposed on an inner surface of the rotor chamber and disposed at a central portion of the inner rotor; In order to reduce friction between the rotor chamber and the outer rotor, a friction surface reduction unit formed on a friction surface between the rotor chamber and the outer rotor; may include.

In addition, in an embodiment of the present invention, the friction surface reducing part may be formed on a friction surface facing the rotor chamber in the outer rotor.

In addition, in an embodiment of the present invention, the friction surface reducing part may be formed on a friction surface facing the outer rotor in the rotor chamber.

In addition, in the embodiment of the present invention, the friction surface reducing portion may be formed on each of the friction surfaces facing each other in the outer rotor and the rotor chamber.

In addition, in an embodiment of the present invention, the friction surface reducing part may be in the form of a cutout groove formed by cutting the friction surface of the outer rotor or the friction surface of the rotor chamber.

In addition, in an embodiment of the present invention, the friction surface reducing part may be connected to the inner surface of the outer rotor and not connected to the outer surface of the outer rotor.

In addition, in the embodiment of the present invention, a portion of the fluid pressurized in the rotor chamber is introduced into the friction surface reducing part to reduce friction between the friction surface of the outer rotor and the friction surface of the rotor chamber.

In addition, in an embodiment of the present invention, the fluid is oil, and the oil flowing into the friction surface reducing unit may lubricate the friction surface between the outer rotor and the rotor chamber.

In addition, in an embodiment of the present invention, the outer rotor may include: an outer rotor body having an opening hole disposed in the center of the inner rotor; And a plurality of alternately formed along the inner periphery of the opening hole, the first gear tooth type and the first gear groove formed in the inner rotor, and a second gear tooth type and a second gear groove for pressurizing the fluid; including; The friction surface reducing part may be formed on the outer rotor body.

In addition, in the embodiment of the present invention, the friction surface reducing part may be in the form of a cutout groove formed by cutting the friction surface facing the rotor chamber from the outer rotor body.

In addition, in an embodiment of the present invention, the friction surface reducing part may be formed in a position corresponding to the second gear groove on the outer rotor body.

In addition, in an embodiment of the present invention, the friction surface reducing part may be connected to the inner surface of the outer rotor body and not connected to the outer surface of the outer rotor body.

In addition, in the embodiment of the present invention, the inner end of the friction surface reducing part may have a curved shape.

In addition, in the embodiment of the present invention, the inner end of the friction surface reducing part may have a stepped shape having a predetermined height D1.

In addition, in the embodiment of the present invention, an inclined portion inclined in a radial direction from the center of the outer rotor may be formed at the inner end of the friction surface reducing portion.

Also, in the embodiment of the present invention, side grooves are formed on both sides of the friction surface reducing part on the outer rotor body, and the side grooves may be formed in a size corresponding to the width of the second gear groove.

In addition, in an embodiment of the present invention, a side inclined portion inclined in the circumferential direction of the outer rotor from the center of the friction surface reducing portion may be formed at the inner end of the side groove.

In addition, in the embodiment of the present invention, the friction surface reducing part may be formed with a protrusion arranged in a radial direction from the center of the outer rotor.

In addition, in an embodiment of the present invention, the friction surface reducing portion is formed at a predetermined height D1 on the surface of the outer rotor body, and the height D2 of the protrusion may be lower than the friction surface reducing portion height D1.

In addition, in the embodiment of the present invention, the rotor chamber is formed by coupling the pump housing and the rotor cover, and the friction surface reducing part may be formed on the surface of the outer rotor body facing the rotor cover.

In addition, in the embodiment of the present invention, the rotor chamber is formed by coupling the pump housing and the rotor cover, and the friction surface reducing part may be formed on the surface of the outer rotor body facing the bottom surface of the rotor chamber.

According to the present invention, by reducing the friction surface between the outer rotor and the rotor chamber, it is possible to reduce wear/damage between the outer rotor and the rotor chamber, so that the service life can be extended.

In addition, by lubricating by introducing oil into the friction surface between the outer rotor and the rotor chamber while maintaining the volumetric efficiency of the pump, the relative rotation between the outer rotor and the inner rotor can be smoothed, thereby improving the pumping performance.

This can increase the mechanical efficiency of the pump by reducing the driving torque, and ultimately improve the overall performance of the machinery by efficiently supplying oil to the machinery to which the pump is applied.

1 is a front view showing the external shape of the pump housing in the present invention pump.
Figure 2 is a side view showing the outer shape of the pump housing in the present invention pump.
Figure 3 is a rear view showing the outer shape of the pump housing in the present invention pump.
Figure 4 is a perspective view showing the outer shape of the pump housing in the present invention pump.
Figure 5 is an exploded perspective view of the inner rotor and the outer rotor in the pump of the present invention.
6 is a view showing the arrangement structure of the inner rotor and the outer rotor disposed in the rotor chamber in the present invention pump.
7 is a partial cross-sectional view showing the arrangement structure between the friction surface reduction part of the outer rotor and the rotor chamber in the pump of the present invention.
Figure 8a is a perspective view showing a first embodiment of the friction surface reducing portion formed on the outer rotor of the present invention.
Figure 8b is a plan view showing the first embodiment of the friction surface reduction portion formed on the outer rotor of the present invention.
8C is a cross-sectional view CC disclosed in FIG. 8B.
Figure 9a is a plan view showing a second embodiment of the friction surface reduction portion formed on the outer rotor of the present invention.
Fig. 9B is a FF cross-sectional view shown in Fig. 9A;
Figure 10a is a plan view showing a third embodiment of the friction surface reducing portion formed on the outer rotor of the present invention.
Fig. 10B is a cross-sectional view of the EE disclosed in Fig. 10A;
Figure 11a is a plan view showing a fourth embodiment of the friction surface reduction portion formed on the outer rotor of the present invention.
Fig. 11B is a cross-sectional view of the HH shown in Fig. 11A;
12A is a view comparing the torque change value per RPM between the pump of the present invention and the conventional pump.
Figure 12b is a view comparing the flow rate change value per RPM between the pump of the present invention and the conventional pump.
13 is a perspective view showing a conventional outer rotor structure.

Hereinafter, preferred embodiments of the pump according to the present invention will be described in detail with reference to the accompanying drawings.

The embodiments listed in the present invention may be applied in combination with each other within a range that does not conflict with each other.

1 to 6 , the pump 100 according to an embodiment of the present invention includes a pump housing 200 , an inner rotor 300 , an outer rotor 400 and a friction surface reduction unit 460 . can be

The pump housing 200 may be coupled to a device such as a vehicle, and may be mechanically coupled to a transmission device such as a motor or a mechanical device such as a crankshaft, camshaft, and power belt.

The pump housing 200 may include a rotor chamber 210 , a suction port 221 , an exhaust port 231 , a suction port 223 , a discharge port 233 , and a rotor cover 240 .

5 and 6 , the suction port 221 may be formed at the lower portion of the pump housing 200 , and the discharge port 231 is spaced apart from the suction port 221 of the pump housing 200 . It may be formed at the bottom.

The rotor chamber 210 may be formed in a central portion of the pump housing 200 , and the inner rotor 300 and the outer rotor 400 may be disposed in the rotor chamber 210 .

In addition, on the bottom surface 212 of the rotor chamber 210 , a suction port 223 communicating with the suction port 221 and a discharge port 233 spaced apart from the suction port 223 and communicating with the discharge port 231 are provided. can be formed.

Oil is supplied from the outside through the suction port 221 and flows to the suction port 223 , and is pressurized by the relative rotation of the inner rotor 300 and the outer rotor 400 in the rotor chamber 210 . After flowing to the discharge port 233, it may be discharged to the outside through the discharge port 231.

In addition, the rotor cover 240 may be coupled to the pump housing 200 and seal the rotor chamber 210 . Referring to FIG. 5 , the rotor cover 240 may be fastened to the pump housing 200 by a plurality of bolts 241 . Since oil flows in the rotor chamber 210, it is sealed with the rotor cover 240 to prevent oil leakage. At this time, although not shown in the drawings, an O-ring-shaped seal may be disposed between the rotor cover 240 and the pump housing 200 to increase sealing force.

A shaft insertion part 243 may be formed in the central part of the rotor cover 240 , and the shaft 500 connected to the driving part 600 may be inserted and disposed. In the present invention, the driving unit 600 may be various power generating devices capable of generating rotational force.

Next, the inner rotor 300 may be disposed in the central portion of the rotor chamber 210 , and the shaft 500 connected to the driving unit 600 may be coupled to the central portion.

The inner rotor 300 may include an inner rotor body 310 , a shaft hole 320 , a coupling piece 330 , a first gear tooth type 340 , and a first gear groove 350 .

The inner rotor body 310 may have a ring shape, and may be disposed in the center of the rotor chamber 210 .

The shaft hole 320 may be formed in a central portion of the inner rotor body 310 , and the shaft 500 may be inserted thereinto.

The coupling piece 330 may be formed on the inner surface of the shaft hole 320 , and may be coupled to the shaft 500 so that the rotational force of the shaft 500 is transmitted to the inner rotor 300 . have.

A plurality of the first gear tooth type 340 and the first gear groove 350 may be alternately formed in a radial direction along the outer circumference of the inner rotor body 310 . In general, it may be composed of a gear tooth shape that smoothly connects to each other in the form of a wave pattern.

Next, the outer rotor 400 is disposed on the inner surface of the rotor chamber 210, the inner rotor 300 may be inserted into the central portion.

The outer rotor 400 may include an outer rotor body 410 , an opening hole 420 , a second gear tooth type 440 , and a second gear tooth type 440 .

The outer rotor body 410 may have a ring shape, and may be disposed in close contact with the inner surface of the rotor chamber 210 .

The opening hole 420 may be formed in a central portion of the outer rotor body 410 , and the inner rotor may be disposed thereon.

A plurality of the second gear tooth type 440 and the second gear groove 450 may be alternately formed in a radial direction along the inner circumference of the outer rotor body 410 . In general, it may be composed of a gear tooth shape that smoothly connects to each other in the form of a wave pattern.

The second gear tooth type 440 and the second gear groove 450 of the outer rotor 400 and the first gear tooth type 340 and the first gear groove 350 of the inner rotor 300 are engaged with each other, can rotate together. At this time, the oil introduced from the suction port 223 is pressurized to be discharged to the discharge port 233 .

The friction surface reducing unit 460 may be formed on a friction surface between the rotor chamber 210 and the outer rotor 400 to reduce friction between the rotor chamber 210 and the outer rotor 400 . .

That is, the friction surface reducing part 460 is formed on a friction surface facing the rotor chamber 210 in the outer rotor 400 or friction facing the outer rotor 400 in the rotor chamber 210 . may be formed on the surface. Alternatively, the outer rotor 400 and the rotor chamber 210 may be respectively formed on friction surfaces facing each other.

In the embodiment of the present invention, the friction surface reducing part 460 may be in the form of a cutout groove formed by cutting the friction surface of the outer rotor 400 or the friction surface of the rotor chamber 210 .

Specifically, the cut-out groove may be connected to the inner surface of the outer rotor 400 and not connected to the outer surface of the outer rotor 400 . That is, the outer surface of the outer rotor 400 is not in the form of a hole penetrating from the inner surface to the outer surface, but in the form of a groove in which the outer surface is blocked. This is so that when the oil to be reviewed below flows into the incision groove, it remains inside the incision groove and performs a lubrication function.

Accordingly, as the cut-out groove is implemented in a groove shape, it has a technical feature of reducing a friction surface and performing a lubrication function due to oil residual.

As the friction surface reduction part 460 is formed, the friction area in contact between the surface of the rotor chamber 210 and the surface of the outer rotor 400 is reduced by the area of the friction surface reduction part 460, Wear according to the rotation of the outer rotor 400 is reduced.

In addition, since a portion of the fluid pressurized in the rotor chamber 210 flows into the friction surface reducing unit 460 , friction between the friction surface of the outer rotor 400 and the friction surface of the rotor chamber 210 . can be reduced. In an embodiment of the present invention, the fluid is oil, and the oil flowing into the friction surface reducing unit 460 lubricates the friction surface between the outer rotor 400 and the rotor chamber 210 , so the outer rotor 400 . ) rotation becomes smoother, and the relative wear degree between the surface of the rotor chamber 210 and the surface of the outer rotor 400 is alleviated.

Hereinafter, the configuration and effect of the friction surface reduction unit 460 will be described based on the embodiment in which the friction surface reduction unit 460 is formed on the outer rotor 400 . However, the content to be described below may be equally applied even when the friction surface reducing part 460 is formed in the rotor chamber 210 .

1 to 6 , the friction surface reducing part 460 may be formed on the outer rotor body 410 . In the present invention, a portion of the oil pressurized to the friction surface reducing unit 460 is introduced to reduce friction between the surface of the outer rotor body 410 and the surface of the rotor chamber 210 .

The outer rotor 400 is disposed in the rotor chamber 210 of the pump, and in general, the inner surface of the rotor chamber 210 and the surface of the outer rotor 400 form a friction surface. Accordingly, when the outer rotor 400 rotates, friction may occur with the inner surface of the rotor chamber 210 and wear may occur.

In addition, since the surface of the outer rotor 400 and the inner surface of the rotor chamber 210 are not lubricated smoothly, the rotation of the outer rotor 400 is not constant, which means that the driving torque of the rotary pump itself is not constant. comes down to the cause Ultimately, it degrades pump performance.

In the present invention, in order to solve the above problem, the friction surface reducing part 460 is formed on the surface of the outer rotor body 410 .

Specifically, the friction surface reducing part 460 may be formed in a position corresponding to the second gear groove 450 on the outer rotor body 410 .

When the outer rotor 400 and the inner rotor 300 rotate relative to each other, the portion to which the oil is substantially pressed is the second gear groove 450 of the outer rotor 400 and the inner rotor 300 . It becomes a region in which the first gear tooth type 340 is formed. Therefore, by machining the friction surface reducing part 460 at a position corresponding to the second gear groove 450 which is a portion where the first gear tooth type 340 is engaged with each other and pressurizes the oil, the oil is transferred to the friction surface reducing part (460) to be introduced into the interior.

Here, the friction surface reducing part 460 is cut to the inner surface of the outer rotor body 410 , but is not cut to the outer surface of the outer rotor body 410 . This is to prevent the oil flowing into the friction surface reducing part 460 from being lost to the outer surface of the outer rotor body 410 , so that the flow rate of oil flowing into the discharge port 233 is reduced. This machining shape can have a sealing effect.

Referring to FIG. 7 , the inner rotor 300 and the outer rotor 400 are disposed inside the rotor chamber 210 , and the rotor cover 240 is coupled to seal the rotor chamber 210 . are doing

In addition, the friction surface reducing part 460 is formed on the surface of the outer rotor body 410 facing the rotor cover 240 .

When the shaft 500 rotates according to the operation of the driving unit 600 and the inner rotor 300 connected to the shaft 500 rotates, the first gear tooth type 340 of the inner rotor 300 It is engaged with the second gear groove 450 of the outer rotor 400 and pressurizes the oil.

At this time, a portion of the pressurized oil flows into the friction surface reducing part 460 .

Basically, as the friction surface reducing part 460 is formed on the surface of the outer rotor body 410, the friction between the outer rotor body 410 and the rocker cover is equal to the area of the friction surface reducing part 460. area will be reduced. Accordingly, the degree of wear according to the rotation of the outer rotor 400 is also reduced, and the frictional resistance against the rotation itself is also reduced.

And as a part of the oil flows into the inside of the friction surface reducing part 460 , it lubricates the friction surface between the outer rotor body 410 and the rotor cover 240 , which is on the surface of the rotor cover 240 . The relative rotation of the outer rotor 400 with respect to the smooth.

In addition, although not shown in the drawings in another embodiment of the present invention, the friction surface reducing part 460 is formed on the surface of the outer rotor body 410 facing the bottom surface 212 of the rotor chamber 210 . can be

In this case, the same effect can be obtained. As the friction surface reducing part 460 is formed on the surface of the outer rotor body 410 , the outer rotor body 410 and the rotor chamber 210 are separated by the area of the friction surface reducing part 460 . The friction area between the bottom surfaces 212 is reduced. Accordingly, the degree of wear according to the rotation of the outer rotor 400 is also reduced, and the frictional resistance against the rotation itself is also reduced.

And as a part of the oil flows into the friction surface reducing part 460, the friction surface between the outer rotor body 410 and the bottom surface 212 of the rotor chamber 210 is lubricated, which is the rotor chamber. The relative rotation of the outer rotor 400 with respect to the bottom surface 212 of the 210 is smooth.

In addition, the friction surface reducing portion 460 may be formed on both surfaces of the outer rotor body 410 , in this case both the rotor cover 240 and the bottom surface 212 of the rotor chamber 210 . reduction of friction area and lubrication effect can be expected.

Meanwhile, referring to FIGS. 8A to 8C , a first embodiment of the outer rotor 400 according to the present invention is disclosed.

In the first embodiment of the outer rotor 400 , the friction surface reducing part 460 may be formed in a position corresponding to the second gear groove 450 on the outer rotor body 410 , and the friction surface The inner end of the reducing part 460 may have a curved shape. In addition, the friction surface reducing part 460 may be formed with a flat part 461 through which oil flows, and the inner end of the friction surface reducing part 460 has a stepped part 460a having a predetermined depth D1. can be formed. Here, the upper portion of the stepped portion 460a may coincide with the surface of the outer porter body.

The friction surface reducing part 460 is cut and connected to the inner surface of the outer rotor body 410 , but by forming the stepped part 460a, the friction surface reducing part 460 is the outer rotor body 410 . There is no incision to the outer surface of the This is to prevent the oil flowing into the friction surface reducing part 460 from being lost to the outer surface of the outer rotor body 410 , so that the flow rate of oil flowing into the discharge port 233 is reduced. The stepped portion 460a may perform a sealing function to prevent oil leakage.

As described above, in the first embodiment of the present invention, the friction surface reducing part 460 may be formed on one or both surfaces of the outer rotor body 410, in which case the rotor cover 240 ) and the bottom surface 212 of the rotor chamber 210 can be expected to reduce the friction area and lubricating effect. For this, reference is made to the above description.

Next, referring to FIGS. 9A and 9B , a second embodiment of the outer rotor 400 according to the present invention is disclosed.

In the second embodiment of the outer rotor 400 , the friction surface reducing part 460 may be formed in a position corresponding to the second gear groove 450 on the outer rotor body 410 , and the friction The surface reducing part 460 may have a flat part 461 through which oil flows, and the inner end of the friction surface reducing part 460 may have a curved shape.

In this case, the inner end of the friction surface reducing part 460 may be provided with an inclined part 462 forming an inclination angle θ1 in a radial direction from the center of the outer rotor 400 . Here, the upper side of the inclined portion 462 may coincide with the surface of the outer porter body.

The friction surface reducing part 460 is cut and connected to the inner surface of the outer rotor body 410 , but by forming the inclined part 462 , the friction surface reducing part 460 is connected to the outer rotor body 410 . There is no incision to the outer surface of the

This is to prevent the oil flowing into the friction surface reducing part 460 from being lost to the outer surface of the outer rotor body 410 , so that the flow rate of oil flowing into the discharge port 233 is reduced. Since the upper portion of the inclined portion 462 has a height that coincides with the surface of the outer rotor body 410 , a sealing function to prevent oil leakage may be performed.

Additionally, as the inclined portion 462 is formed as an inclined surface that rises in a radial direction from the center of the outer rotor 400, the space through which oil can be introduced gradually decreases from the lower side of the inclined portion 462 to the upper side. leakage can be further prevented.

As described above, even in the second embodiment of the present invention, the friction surface reducing part 460 may be formed on one or both surfaces of the outer rotor body 410, in this case the rotor cover 240 ) and the bottom surface 212 of the rotor chamber 210 can be expected to reduce the friction area and lubricating effect. For this, reference is made to the above description.

Next, referring to FIGS. 10A to 10B , a third embodiment of the outer rotor 400 according to the present invention is disclosed.

In the third embodiment of the outer rotor 400 , the friction surface reducing part 460 may be formed in a position corresponding to the second gear groove 450 on the outer rotor body 410 , and the friction The surface reducing part 460 may have a flat part 461 through which oil flows, and the inner end of the friction surface reducing part 460 may have a curved shape. In addition, the inner end of the friction surface reducing portion 460 may have a stepped portion 460a having a predetermined depth D1. Here, the upper portion of the stepped portion 460a may coincide with the surface of the outer porter body.

The friction surface reducing part 460 is cut and connected to the inner surface of the outer rotor body 410 , but by forming the stepped part 460a, the friction surface reducing part 460 is the outer rotor body 410 . There is no incision to the outer surface of the This is to prevent the oil flowing into the friction surface reducing part 460 from being lost to the outer surface of the outer rotor body 410 , so that the flow rate of oil flowing into the discharge port 233 is reduced. The stepped portion 460a may perform a sealing function to prevent oil leakage.

In addition, in the third embodiment of the present invention, side grooves 463 are formed on both sides of the friction surface reducing part 460 on the outer rotor body 410 , and the side grooves 463 are the second gear grooves. It may be formed in a size corresponding to the width of 450 .

Referring to FIG. 10A , a pair of side grooves 463 connected to both sides of the outer rotor body 410 where the second gear grooves 450 are formed can be seen. This arrangement is to allow a portion of the oil pressurized in engagement with the first gear tooth type 340 in the second gear groove 450 to flow into the surface of the outer rotor body 410 over a wider area. Through this, the friction surface between the outer rotor body 410 and the rotor chamber 210 can be further reduced, and the lubrication effect can be maximized by widening the inflow range of oil.

Here, at the inner end of the side groove 463, a side inclined portion 464 forming an inclination angle θ2 in the circumferential direction of the outer rotor 400 from the center of the friction surface reducing portion 460 may be disposed. .

This is because when the oil flowing into the friction surface reducing part 460 is expanded into the side groove 463, it is lost outside the side groove 463, that is, in the circumferential direction of the outer rotor body 410, the This is to prevent the flow rate of oil flowing to the discharge port 233 from being reduced. As the upper portion of the side inclined portion 464 has a height that coincides with the surface of the outer rotor body 410 , a sealing function to prevent oil leakage may be performed.

And as the side inclined portion 464 is formed as an inclined surface that rises in the circumferential direction of the outer rotor body 410, the space through which the oil can be introduced gradually decreases from the lower side to the upper side of the side inclined portion 464. Oil leakage can be prevented.

As described above, even in the third embodiment of the present invention, the friction surface reducing part 460 may be formed on one or both surfaces of the outer rotor body 410, in which case the rotor cover 240 ) and the bottom surface 212 of the rotor chamber 210 can be expected to reduce the friction area and lubricating effect. For this, reference is made to the above description.

Next, referring to FIGS. 11A to 11B , a fourth embodiment of the outer rotor 400 according to the present invention is disclosed.

In the fourth embodiment of the outer rotor 400 , the friction surface reducing part 460 may be formed in a position corresponding to the second gear groove 450 on the outer rotor body 410 , and the friction The surface reducing part 460 may have a flat part 461 through which oil flows, and the inner end of the friction surface reducing part 460 may have a curved shape. In addition, the inner end of the friction surface reducing portion 460 may have a stepped portion 460a having a predetermined depth D1. Here, the upper portion of the stepped portion 460a may coincide with the surface of the outer porter body.

The friction surface reducing part 460 is cut and connected to the inner surface of the outer rotor body 410 , but by forming the stepped part 460a, the friction surface reducing part 460 is the outer rotor body 410 . There is no incision to the outer surface of the This is to prevent the oil flowing into the friction surface reducing part 460 from being lost to the outer surface of the outer rotor body 410 , so that the flow rate of oil flowing into the discharge port 233 is reduced. The stepped portion 460a may perform a sealing function to prevent oil leakage.

In addition, one or more protrusions 467 arranged in a radial direction from the center of the outer rotor 400 may be formed in the friction surface reducing part 460 . At this time, when the stepped portion 460a of the friction surface reducing portion 460 is formed at a predetermined height D1 on the surface of the outer rotor body 410 , the height D2 of the protrusion 467 is the friction surface It may be formed to be lower than the height D1 of the stepped portion 460a of the reduced portion 460 .

The protrusion groove may serve to guide the flow of oil flowing into the friction surface reducing part 460 to flow up to the stepped part 460a. In addition, since the height D2 of the protrusion groove is lower than the height D1 of the stepped portion 460a of the friction surface reducing part 460 , the rotor chamber 210 is rotated between the outer rotor 400 . ), it is possible to reduce the amount of oil flowing into the friction surface reducing part 460 while not generating friction with the inner surface. This is to allow a greater amount of oil to flow into the discharge port 233 while maintaining the friction area reduction and lubrication effect.

As described above, even in the fourth embodiment of the present invention, the friction surface reducing part 460 may be formed on one or both surfaces of the outer rotor body 410, in which case the rotor cover 240 ) and the bottom surface 212 of the rotor chamber 210 can be expected to reduce the friction area and lubricating effect. For this, reference is made to the above description.

On the other hand, FIG. 12A is a table comparing the torque change value per RPM between the pump 100 of the present invention and the conventional pump, and FIG. 12B is a comparison of the flow rate change value per RPM between the pump 100 of the present invention and the conventional pump. A diagram is disclosed.

The charts shown in FIGS. 12A and 12B are experimental data prepared based on the first embodiment of the outer rotor 400 of the present invention. In the diagram, X denotes a pump to which the conventional outer rotor 400 is applied, and Y denotes a pump to which the outer rotor 400 of the present invention is applied.

In addition, the following [Table 1] is an experimental value derived from the torque change value and the flow rate change value per RPM by simulating a pump to which the conventional outer rotor 400 (see FIG. 13) is applied. And the following [Table 2] is an experimental value derived from the torque change value and flow rate change value per RPM by simulating the pump to which the present invention the outer rotor 400 (refer to Fig. 8a) is applied.

Conventional outer rotor (FIG. 13) applied pump total efficiency volumetric efficiency machine efficiency rpm Nm lpm % % % 600 2.234 5.59 52.0 93.2 55.8 800 2.332 7.53 50.4 94.1 53.5 1000 2.362 9.51 50.2 95.1 52.8 1500 2.499 14.47 48.2 96.5 49.9 2000 2.636 19.5 46.1 97.5 47.3 2500 2.842 24.45 42.9 97.8 43.9

Outer rotor (Fig. 8a) applied pump of the present invention total efficiency volumetric efficiency machine efficiency rpm Nm lpm % % % 600 2.078 5.57 55.8 92.8 60.1 800 2.127 7.5 55.0 93.8 58.7 1000 2.176 9.5 54.5 95.0 57.4 1500 2.391 14.44 50.2 96.3 52.2 2000 2.519 19.45 48.2 97.3 49.5 2500 2.724 24.48 44.8 97.9 45.8

First, referring to FIGS. 12A and [Tables 1 and 2], when measuring from 500 rpm to 2500 rpm, overall the driving torque value decreases in the torque change formed by Y compared to the torque change formed by X. can be checked

A decrease in the driving torque value means that the load rotating the shaft 500 in the driving unit 600 decreases. This is because the friction surface reducing part 460 is formed so that the frictional resistance is reduced as the frictional area between the surface of the outer rotor 400 and the inner surface of the rotor chamber 210 of the present invention is reduced, and accordingly, to overcome the frictional resistance The required driving force decreases proportionally. That is, since the required driving force is reduced by that much, the mechanical efficiency of the pump is ultimately improved. Comparing [Tables 1 and 2], it can be confirmed that Y has overall higher mechanical efficiency compared to X.

Next, referring to FIGS. 12B and [Tables 1 and 2], when measuring from 500 rpm to 2500 rpm, it can be seen that there is little difference between the flow rate change value formed by X and the flow rate change value formed by Y overall.

That is, even if the friction surface reducing part 460 is formed in the outer rotor 400 , since the depth D1 of the friction surface reducing part 460 is low, the amount of oil flowing in is so small that it does not affect the flow rate of the entire pump. indicates that

Therefore, comparing [Tables 1 and 2], it can be confirmed that the volumetric efficiencies between X and Y are almost the same. Even if the friction surface reducing part 460 is formed in the outer rotor 400, the flow rate of oil is virtually nonexistent, and it effectively reduces the friction area to reduce the driving torque and at the same time to lubricate the outer rotor 400 It has the effect of smoothing the rotation of

Here, the total efficiency disclosed in [Tables 1 and 2] is the combined efficiency of the volumetric efficiency and the mechanical efficiency. Comparing the total efficiency of X and Y per RPM, the total efficiency of Y is higher than that of X in the entire RPM range. It can be seen that the value is derived.

In summary, it can be confirmed through the experimental results that the pump Y to which the outer rotor 400 of the present invention is applied is superior to the conventional pump X to which the outer rotor 400 is applied.

Through the above-described structure, the present invention can reduce the wear/damage between the outer rotor 400 and the rotor chamber 210 by reducing the friction surface between the outer rotor 400 and the rotor chamber 210, thereby prolonging the service life. can be extended

In addition, while maintaining the volumetric efficiency of the pump 100, oil is introduced into the friction surface between the outer rotor 400 and the rotor chamber 210 to lubricate, thereby smoothing the relative rotation between the outer rotor 400 and the inner rotor 300. This will improve the pumping performance.

This can increase the mechanical efficiency of the pump 100 by reducing the driving torque, and ultimately, it is possible to efficiently supply oil to the machine to which the pump is applied, thereby improving the overall performance of the machine.

The above is merely representative of a specific embodiment of the pump.

Therefore, within the limits that do not depart from the spirit of the present invention described in the claims below, the present invention can be substituted and modified in various forms to clarify that those of ordinary skill in the art can easily grasp that do.

100: pump
200: pump housing 210: rotor chamber
212: bottom surface of the rotor chamber 221: inlet
223: suction port 231: outlet
233: exhaust port 240: rotor cover
241: bolt 243: shaft insert
300: inner rotor 310: inner rotor body
320: shaft hole 330: coupling piece
340: first gear tooth type 350: first gear groove
400: outer rotor 410: outer rotor body
420: opening hole 440: second gear tooth type
450: second gear groove 460: friction surface reduction part (cut groove)
460a: stepped portion 461: flat portion
462: slope 463: side home
464: side inclined portion 467: protrusion
500: shaft 600: driving part

Claims (21)

a pump housing including a rotor chamber;
an inner rotor disposed on the central side of the rotor chamber, the central part having a shaft connected to the driving unit coupled thereto; and
an outer rotor disposed on the inner surface of the rotor chamber, the inner rotor disposed at a central portion;
a friction surface reduction unit formed on a friction surface between the rotor chamber and the outer rotor to reduce friction between the rotor chamber and the outer rotor;
a pump comprising
According to claim 1,
The friction surface reducing part is a pump, characterized in that formed on the friction surface facing the rotor chamber in the outer rotor.
According to claim 1,
The friction surface reduction part is a pump, characterized in that formed on the friction surface facing the outer rotor in the rotor chamber.
According to claim 1,
The friction surface reducing part is a pump, characterized in that each formed on the friction surface facing each other in the outer rotor and the rotor chamber.
According to claim 1,
The friction surface reducing part is a pump, characterized in that the incision groove shape formed by cutting the friction surface of the outer rotor or the friction surface of the rotor chamber.
6. The method of claim 5,
The friction surface reduction part, the pump characterized in that it is connected to the inner surface of the outer rotor is not connected to the outer surface of the outer rotor.
6. The method of claim 5,
A part of the fluid pressurized in the rotor chamber flows into the friction surface reducing part to reduce friction between the friction surface of the outer rotor and the friction surface of the rotor chamber.
8. The method of claim 7,
the fluid is oil;
The oil flowing into the friction surface reducing part lubricates the friction surface between the outer rotor and the rotor chamber.
According to claim 1,
The outer rotor,
an outer rotor body having an opening hole disposed in the center of the inner rotor; and
A plurality of alternately formed along the inner periphery of the opening hole, a first gear tooth type and a first gear groove formed in the inner rotor, and a second gear tooth type and a second gear groove for pressurizing the fluid;
The friction surface reduction part, the pump, characterized in that formed on the outer rotor body.
10. The method of claim 9,
The friction surface reducing part is a pump, characterized in that it is in the form of a cut-out groove formed by cutting the friction surface facing the rotor chamber from the outer rotor body.
11. The method of claim 10,
The friction surface reduction part is a pump, characterized in that formed in a position corresponding to the second gear groove on the outer rotor body.
12. The method of claim 11,
The friction surface reducing part is connected to the inner surface of the outer rotor body, the pump, characterized in that not connected to the outer surface of the outer rotor body.
13. The method of claim 12,
The inner end of the friction surface reducing part is a pump, characterized in that the curved shape.
13. The method of claim 12,
The inner end of the friction surface reducing portion is a pump, characterized in that the stepped portion having a predetermined height (D1).
13. The method of claim 12,
Pump, characterized in that the inner end of the friction surface reducing portion is formed with an inclined portion inclined in a radial direction from the center of the outer rotor.
13. The method of claim 12,
Side grooves are formed on both sides of the friction surface reducing part on the outer rotor body, and the side grooves are formed in a size corresponding to the width of the second gear groove.
17. The method of claim 16,
The pump, characterized in that the inner end of the side groove is formed with a side inclined portion inclined in the circumferential direction of the outer rotor from the center of the friction surface reducing portion.
13. The method of claim 12,
Pump, characterized in that the friction surface reducing portion is formed with a projection arranged in a radial direction from the center of the outer rotor.
19. The method of claim 18,
On the surface of the outer rotor body, the friction surface reducing portion is formed at a predetermined height (D1),
The height (D2) of the protrusion is lower than the height (D1) of the friction surface reducing part.
11. The method of claim 10,
The rotor chamber is formed by combining a pump housing and a rotor cover,
The friction surface reduction part pump, characterized in that formed on the surface of the outer rotor body facing the rotor cover.
11. The method of claim 10,
The rotor chamber is formed by combining a pump housing and a rotor cover,
The friction surface reducing part pump, characterized in that formed on the surface of the outer rotor body facing the bottom surface of the rotor chamber.

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