KR20230097721A - Oil pump for electric vehicle - Google Patents

Abstract

The present invention is accommodated in the receiving portion of the housing, the reversible ring selectively rotated by 180 ° according to the rotational direction of the rotating shaft in the receiving portion; an out-rotor having a plurality of internal teeth formed at regular intervals along an inner circumferential surface in an annular shape and being accommodated in a circular rotor built-in portion formed on one side of the reversible ring to transmit rotational force to the reversible ring; A plurality of external teeth are formed at regular intervals along the outer circumferential surface in an annular shape, and the outrotor is accommodated inside the outrotor so that a portion of the inner teeth and the outer teeth of the outrotor are engaged, and is connected to the rotation shaft and engaged with the rotational force of the rotation shaft. an inner rotor that rotates; And a rotary restraint provided on the inner surface of the rotor internal part of the reversible ring to exert a reaction force with the reversible ring and the outrotor; including, the viscous force of the oil according to the oil temperature or the rotation of the outrotor, which is a rotating body. Provided is an oil pump for an electric vehicle in which the rotational force of the outrotor, which is a rotating body, is transmitted to the reversible ring regardless of speed, so that the reversible ring rotates in conjunction with the rotation direction of the outrotor.

Description

Oil pump for electric vehicle {Oil pump for electric vehicle}

The present invention relates to an oil pump for an electric vehicle, and more particularly, to the inner surface of a reversible rotor internal part in which an outrotor rotating in conjunction with the rotation of a rotating shaft selectively rotating in a clockwise or counterclockwise direction is incorporated. Equipped with a reversible ring and a rotation restraint that exerts a physical reaction force with the outrotor, regardless of the viscous force of the oil according to the oil temperature or the rotational speed of the outrotor, the rotating chain, the rotational force of the outrotor is reversible. It relates to an oil pump for an electric vehicle that is transmitted so that the reversible is rotated in conjunction with the rotation direction of the outrotor.

In general, an automatic transmission serves to automatically change the rotational speed and rotational force of an engine and transmits them to driving wheels. Such an automatic transmission includes a torque converter that smoothly transfers engine torque to the transmission, An oil pump that transmits and lubricates, a planetary gear that adjusts the number of revolutions (speed-up, deceleration, direct coupling, reverse), an operating mechanism (clutch and brake) that controls the drive of the planetary gear, and a control mechanism that controls the operating mechanism (valve body and electronic control mechanism).

Here, looking at the oil pump of the automatic transmission in more detail, the oil pump is bolted to the automatic transmission case (T/M Case), and the gear of the pump is driven by the rotation of the torque converter to generate ATF flow in the automatic transmission. let it

At this time, the ATF discharged from the oil pump circulates through the control valve assembly of the transmission in a pressurized state to operate valves and operating elements, that is, to supply hydraulic pressure in the automatic transmission, and to absorb heat from the transmission and torque converter to operate the automatic transmission. In addition to cooling the transmission, ATF flows to various hydraulic circuits, valves, operating elements, etc., and lubricates and cleans bushings, bearings, gears, etc.

Among the components of the oil pump, the cover is connected to the automatic transmission case (T/M Case) to perform some functions of the valve body. Lub... etc.) is formed on the cover to install a path to supply hydraulic pressure to each required element in the automatic transmission.

Among the components, the reaction shaft is press-fitted into the cover, provides a mounting position for the input shaft, forms a part of the flow path, and also serves as a support for the torque converter to double the torque transmitted from the engine.

As the oil pump, trochoid type, crescent type and gear type oil pumps (eg, gerotor) are commonly used.

An oil pump is an essential functional part of an engine that is mounted on and driven by an automobile engine. It converts the mechanical energy supplied from the engine into the pressure energy and speed energy of the engine oil to provide lubricating oil to each sliding part inside the engine. It is a part that prevents abnormal wear and seizure of parts by supplying

Components constituting the oil pump include a key, an inner rotor, a rotor case, an O-ring, a screw, and the like. In addition to other standard products in the oil pump, the rotor case is produced by die casting according to the specifications of the oil pump, and the outer rotor and inner rotor are produced by powder sintering.

On the other hand, gerotor oil pumps and motors with arbitrarily generated rotors are composed of an inner rotor and an outer rotor, so the structure is simple, and even if the shape is complicated as the processing precision increases with the development of sintered product manufacturing technology, It is easy to process, easy to assemble, and there is little relative motion between the two teeth, so the change in efficiency is small even after long-term use, and the suction performance is excellent.

Regarding the prior art, Patent Registration No. 10-1251632 (2013.04.01) may be referred to.

The two-way oil pump for the reducer mounted on the electric vehicle drives in the same direction as the rotational direction of the motor, and must discharge the same hydraulic pressure and flow rate regardless of the direction. The bling is installed, and the reversible ring receives the rotational force of the outrotor, which is the rotational body of the pump, and rotates together.

In the prior art, the viscous force of the oil filled in the chamber in the gap between the reversible and the outrotor is the biggest factor affecting the rotation of the reversible.

However, under the conditions of high oil temperature and low rotational speed, the viscous force of the oil existing on both the reversible ring and the outrotor was lowered, resulting in a section in which rotation was not performed intermittently.

In addition, after the oil pump was stopped, a phenomenon occurred in which the reversible ring was incompletely rotated even at the starting point of changing the rotation direction.

As described above, there is a problem in that a section does not satisfy the required pressure and flow rate in the system when the reversing is incompletely rotated.

Figure 1 is a graph showing the discharge flow rate according to the rotation of the reversible ring, the yellow graph line is the flow rate point during normal rotation, and the red graph line is the flow rate recovery due to incomplete rotation of the reversible ring after changing the rotation direction can know that

In the present invention, as the reversible ring rotates in sync with the rotation of the outrotor regardless of the viscous force of the oil lowered by high temperature or the low rotation speed of the outrotor, the rotational properties and responsiveness of the reversible ring are greatly improved In addition, since the reaction force is continuously applied by the rotation restraint even in the stop state of the outrotor, the reversible ring can rotate in response to the rotation even during the initial rotation of the outrotor, as well as in the low-speed rotation section. As the reversing and the gap between the outrotor are minimized, the flow loss is improved, the discharge flow rate is increased, and the efficiency is improved due to the increase in the flow rate at the same RPM compared to before the improvement, and in addition, even when the outrotor rotates at high speed It is an object of the present invention to provide an oil pump for an electric vehicle in which a slip phenomenon due to incomplete rotation of the reversible ring is improved by generating pressure in a gap between the reversible ring and the outrotor.

An oil pump for an electric vehicle according to the present invention is accommodated in an accommodating portion of a housing, and selectively rotates according to the rotational direction of a rotating shaft in the accommodating portion; an out-rotor having a plurality of internal teeth formed at regular intervals along an inner circumferential surface in an annular shape and being accommodated in a circular rotor built-in portion formed on one side of the reversible ring to transmit rotational force to the reversible ring; A plurality of external teeth are formed at regular intervals along the outer circumferential surface in an annular shape, and the outrotor is accommodated inside the outrotor so that a portion of the inner teeth and the outer teeth of the outrotor are engaged, and is connected to the rotation shaft and engaged with the rotational force of the rotation shaft. an inner rotor that rotates; and a rotation restraint provided on the inner surface of the inner portion of the rotor of the reversible ring to exert a reaction force between the reversible ring and the outrotor.

At this time, the rotation restraint according to the present invention includes a friction member in close contact with the outer circumferential surface of the outrotor, and a support member provided on one side of the friction member and elastically supporting the friction member.

Here, the rotation restraint according to the present invention is preferably accommodated in a receiving groove formed on an inner surface of the rotor of the reversible ring, which is close to the outrotor.

In addition, the receiving groove according to the present invention is preferably formed in a plurality of one or two or more on the inner surface of the inner surface of the rotor of the reversible ring, which is close to the outrotor.

In addition, it is preferable to form the internal part of the rotor of the reversible ring according to the present invention to be eccentric to one side based on the center of the reversible ring.

In addition, an arc-shaped groove is formed on the other side of the reversible ring according to the present invention, and the reversible ring is inserted into the groove in the receiving part of the housing to accommodate the reversible ring, while guiding the rotation of the reversible ring. It forms a stopper that regulates rotation so that it does not rotate more than an angle.

The present invention is a rotation restraint that exerts a physical reaction force with the reversible ring and the outrotor on the inner surface of the rotor internal part of the reversible ring in which the outrotor that rotates selectively in conjunction with the rotation of the rotating shaft rotating in a clockwise or counterclockwise direction is built-in. Since the sphere is provided, as the reversible ring rotates in sync with the rotation of the outrotor regardless of the viscous force of the oil lowered by high temperature or the low rotation speed of the outrotor, the rotational and responsiveness of the reversible ring is greatly have an improving effect.

In addition, since the reaction force is continuously applied by the rotation restraint even in the stop state of the outrotor, the reversible ring can rotate in response to the rotation even during the initial rotation of the outrotor, as well as in the low-speed rotation section. As the reversing and the gap between the outrotors are minimized, the flow loss is improved, thereby increasing the discharge flow rate and improving the efficiency due to the increase in the flow rate at the same RPM compared to before improvement.

In addition, even when the outrotor rotates at a high speed, pressure is generated in the gap between the reversible ring and the outrotor, so that a slip phenomenon due to incomplete rotation of the reversible ring is improved.

1 is a graph showing the discharge flow rate according to normal rotation and incomplete rotation of the reversible ring.
2 is an exemplary view showing a state in which a rotation restraint is provided in an oil pump for an electric vehicle according to an embodiment of the present invention.
3 is an exemplary view showing a state in which a physical reaction force acts by a rotation restraint according to an embodiment of the present invention.
4 is an exemplary diagram showing reversible of an oil pump for an electric vehicle according to an embodiment of the present invention.
5 is a graph showing the discharge flow rate according to the rotation direction of the reversible of the oil pump for an electric vehicle according to an embodiment of the present invention.
6 is a graph showing the flow rate according to the rotational speed before and after improvement of the oil pump for an electric vehicle according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to the usual or dictionary meaning, and the inventor appropriately uses the concept of the term in order to explain his/her invention in the best way. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical spirit of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical ideas of the present invention, so at the time of this application, they are equivalent alternatives that can be replaced. It should be understood that variations may exist.

The present invention is a rotation restraint that exerts a physical reaction force with the reversible ring and the outrotor on the inner surface of the rotor internal part of the reversible ring in which the outrotor that rotates selectively in conjunction with the rotation of the rotating shaft rotating in a clockwise or counterclockwise direction is built-in. The sphere is provided so that the rotational force of the outrotor, which is a rotating body, is transmitted to the reversible regardless of the viscous force of the oil according to the oil temperature or the rotational speed of the outrotor, which is a rotating body. It relates to an oil pump for an electric vehicle in which a reversible ring is rotated, referring to the drawings as follows.

An oil pump for an electric vehicle according to an embodiment of the present invention includes an inner rotor having internal teeth formed at regular intervals along the outer circumferential surface in a ring-shaped annular shape, and an outer rotor having outer teeth formed at regular intervals along the inner circumferential surface in a ring-shaped annular shape. It consists of a gerotor pump that moves and discharges the working fluid introduced into the housing by the rotation of the at a constant flow rate.

The oil pump 100 for an electric vehicle according to an embodiment of the present invention with reference to FIGS. 2 to 4 includes a housing 110, a cover (not shown), a reversible ring 130, an outrotor 140, and an inner It includes a rotor 150, first, the housing 110 is a block body having a certain length, vertical length, and thickness, in the center of which is formed an insertion hole into which a rotation shaft of a driving means (not shown) is inserted, , The insertion hole forms an accommodating portion in which the reversible ring 130 is accommodated.

At this time, the accommodating part is preferably formed on one side (front surface) of the housing 110, which is opposite to the direction in which the rotating shaft of the driving means is inserted, and on one side of the housing 110 to seal the accommodating part. A cover (not shown) is attached.

Here, the cover is also a block body having a certain horizontal length, vertical length, and thickness, and a suction port through which fluid is sucked and a discharge port through which fluid is discharged are formed on the left and right sides of the cover, and the housing ( 110), a pair of arc-shaped outer passages communicating with the suction port and the discharge port are formed on the other side (rear surface) facing each other.

At this time, the pair of outer flow passages are preferably formed on the same position as the suction port 133 and the discharge port 134 formed on the inner surface of the reversible ring 130, and in the upper and lower vertical directions from the center of the cover. While being symmetrical to each other based on , they communicate with the suction port and the discharge port, respectively.

And the receiving part formed on one side of the housing 110 accommodates the reversible ring 130, and the reversible ring 130 is selectively according to the direction of rotation of the rotating shaft (not shown) inside the receiving part. Rotate 180°.

Looking at the reversible ring 130 in more detail, the reversible ring 130 has a disk shape so that the overall shape corresponds to the receiving portion of the circular housing 110, and the housing 110 is inserted at the center. A through hole 131 is formed through which the rotating shaft of the driving means passing through the ball passes.

In addition, a circular rotor internal part 132 in which an outrotor 140 and an inner rotor 150 are accommodated is formed at the center of one side (front surface) facing the cover of the reversible ring 130, and the rotor An arc-shaped suction port 133 and discharge port 134 through which suction fluid and discharge fluid flow are formed on the inner surface of the internal part 132 .

At this time, the rotor internal part 132 of the reversible ring 130 is formed to be eccentric to one side based on the center of the reversible ring 130, preferably to be eccentric in one of the up and down directions. It is desirable to form

The suction port 133 and the discharge port 134 formed on the inner surface of the rotor internal part 132 of the reversible ring 130 are based on vertical lines extending from the center of the reversible ring 130 in vertical directions up and down. symmetrical with each other, while the peripheries of the suction port 133 and the discharge port 134 are formed to match the bottom diameters of the outer rotor 140 and the inner rotor 150, the suction port 133 and the discharge port The periphery of 134 is formed to coincide with the tooth bottom diameter of the inner rotor 140, so that the volume of the suction port 133 and the discharge port 134 is the difference between the tooth bottom diameter of the outer rotor 140 and the inner rotor 140. It is preferably located between the root canal.

In addition, one or two or more accommodating grooves 135 are formed on the inner surface of the rotor internal part 132 of the reversible ring 130 that is close to the outrotor 140, and the accommodating groove 135 is It is preferable that the reversible rings 130 are radially arranged with respect to the center of the rotor internal part 132 .

In addition, the receiving groove 135 accommodates the rotation restraint 160, and the rotation restraint 160 is in close contact with the outer circumferential surface of the outrotor 140 to exert a physical reaction force.

At this time, the rotation restraint 160 includes a friction member 161 and a support member 162, and the friction member 161 is preferably made of PTFE (polytetrafluoroethylene = Teflon) material. It is made of a material such as plastic or synthetic resin without limitation, and is in close contact with the outer circumferential surface of the outrotor 140 to provide frictional force to the reversible ring 130 when the outrotor 140 rotates.

And, the support member 162 is provided adjacent to the friction member 161 and supports the friction member 161 with elasticity. The support member 162 is an elastic body having elasticity, and preferably has self-elasticity. It is preferably made of a rubber material having

Therefore, in the reversing ring 130 according to an embodiment of the present invention, one or two or more receiving grooves 135 are formed on the inner surface of the rotor internal part 132 close to the outrotor 140, A rotation restraint 160 is provided in the receiving groove 135, and a physical reaction force is exerted on the outrotor 140 and the reversible ring 130 with the elasticity of the rotation restraint 160, and the physical reaction force As the reversible ring 130 rotates in sync with the rotation of the outrotor 140, regardless of the viscous force of the oil lowered by the high temperature or the low rotational speed of the outrotor, the reversible ring 130 Rotation and responsiveness are greatly improved.

In addition, since the reaction force is continuously applied by the rotation restraint 160 even when the outrotor 140 is stationary, the reversible ring 130 responds to the rotation even during the initial rotation of the outrotor 140. In addition, as the gap between the reversible ring 130 and the outrotor 140 is minimized even in the low-speed rotation section, the flow loss is improved, increasing the discharge flow rate and the same RPM compared to before improvement Efficiency is improved according to the increase in flow rate.

In addition, even when the outrotor 140 rotates at high speed, pressure is generated in the gap between the reversible ring 130 and the outrotor 140, and the slip phenomenon due to incomplete rotation of the reversible ring 130 is improved. do.

Here, an arc-shaped groove 136 is formed on the other side (rear surface) of the reversible ring 130, and the housing 112 in which the reversible ring 130 is accommodated is in the housing 110. Inserted into the groove 136, it is preferable to form a stopper for regulating the rotation of the reversible ring 130 so as not to rotate more than a corresponding angle while guiding the rotation.

In addition, the suction port 133 and the discharge port 134 can reverse their functions to the rotation of the reversible ring 130, that is, when the reversible ring 130 rotates 180° The suction port 133 may function as a discharge port 134 , and the discharge port 134 may function as a suction port 133 .

In addition, the outrotor 140 has a plurality of inner teeth formed at regular intervals along the inner circumferential surface in an annular shape, and is accommodated in a circular rotor internal portion 132 formed on one side of the reversible ring 130.

The inner rotor 150 forms a plurality of outer teeth at regular intervals along the outer circumferential surface in an annular shape, and is accommodated eccentrically inside the outer rotor 140 so that a portion of the inner teeth and outer teeth of the outer rotor 140 are engaged. , It is connected to the rotating shaft and rotates by the rotational force of the rotating shaft.

Here, it is preferable to form a key (not shown) on the inner circumferential surface of the inner rotor 150 so as to be engaged with the rotating shaft to receive rotational force.

In addition, as the outrotor 140 and the inner rotor 150 are embedded in the rotor internal part 132 of the reversible ring 130, the sides of the outrotor 140 and the inner rotor 150 are the reversible rings. The inner surface of the subling 130 is interviewed. At this time, when the outrotor 140 and the inner rotor 150 are selectively rotated, the side surface of the outrotor 140 and the inner rotor 150 is interviewed. Torque (frictional force) acts on the inner surface of the reversible ring 130.

5 is a graph showing the discharge flow rate according to the rotational direction of the reversible ring of the electric vehicle oil pump according to an embodiment of the present invention. Looking at the graph, red indicates that the reversible ring is rotated clockwise. The discharge flow rate according to the rotational speed is shown, and the blue color shows the discharge flow rate according to the rotational speed in the state where the reversible ring is rotated counterclockwise.

Looking at this, the same flow rate is shown regardless of the direction of rotation, which means that the rotation of the reversible ring is smoothly made so that there is no loss of flow rate.

6 is a graph showing the flow rate according to the rotation speed before and after improvement of the oil pump for an electric vehicle according to an embodiment of the present invention, the red graph shows the flow rate according to the rotation speed after improvement, and the black graph shows the flow rate before improvement It shows the flow rate according to the rotational speed.

Looking at this, it can be seen that at low speed (600 ~ 3500 rpm), the efficiency is increased as the flow rate is improved by about 35%, and at high speed (4000 ~ 6500 rpm), the flow rate increase effect is equal or slightly increased.

Therefore, in the oil pump for an electric vehicle according to an embodiment of the present invention, the reversible rotates in sync with the rotation of the outrotor regardless of the viscous force of oil lowered by high temperature or the low rotational speed of the outrotor. The rotation and responsiveness of the subling is greatly improved, and since the reaction force is continuously applied by the rotation restraint even in the stop state of the outrotor, the reversing ring reacts to the rotation even during the initial rotation of the outrotor. In addition to being able to rotate, the flow loss is improved as the gap between the reversible and the outrotor is minimized even in the low-speed rotation section, resulting in an increase in discharge flow rate and an increase in efficiency due to an increase in flow rate at the same RPM compared to before improvement. In addition, even when the outrotor rotates at a high speed, pressure is generated in the gap between the reversible ring and the outrotor, and the slip phenomenon due to incomplete rotation of the reversible ring is improved.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: oil pump for electric vehicles
110: housing
130: reversible
131: through hole
132: internal part of the rotor
133: suction port
134: discharge port
135: receiving groove
136: groove
140: outrotor
150: inner rotor
160: rotation restraint
161: friction member
162: support member

Claims (6)

a reversible ring accommodated in the receiving part of the housing and selectively rotating according to the direction of rotation of the rotating shaft in the receiving part;
an out-rotor having a plurality of internal teeth formed at regular intervals along an inner circumferential surface in an annular shape and being accommodated in a circular rotor built-in portion formed on one side of the reversible ring to transmit rotational force to the reversible ring;
A plurality of external teeth are formed at regular intervals along the outer circumferential surface in an annular shape, and the outrotor is accommodated inside the outrotor so that a portion of the inner teeth and the outer teeth of the outrotor are engaged, and is connected to the rotation shaft and engaged with the rotational force of the rotation shaft. an inner rotor that rotates; and
An oil pump for an electric vehicle comprising a rotation restraint provided on the inner surface of the rotor internal part of the reversible ring and exerting a reaction force with the reversible ring and the outrotor.
The method of claim 1,
The rotation restraint is
a friction member in close contact with the outer circumferential surface of the outrotor;
An oil pump for an electric vehicle comprising: a support member provided on one side of the friction member and elastically supporting the friction member.
The method of claim 2,
The rotation restraint is
An oil pump for an electric vehicle accommodated in a receiving groove formed on an inner surface of the rotor of the reversible ring, which is close to the outrotor.
The method of claim 3,
The receiving groove is
An oil pump for an electric vehicle formed by one or more than one on the inner surface adjacent to the outrotor among the internal parts of the rotor of the reversible ring.
The method of claim 1,
The internal part of the reversible rotor
An oil pump for an electric vehicle formed eccentrically to one side based on the center of the reversible ring.
The method of claim 5,
An arc-shaped groove is formed on the other side of the reversible ring,
An oil pump for an electric vehicle in which a stopper is inserted into the groove in the receiving portion of the housing in which the reversible ring is accommodated to guide rotation of the reversible ring and prevent rotation beyond a corresponding angle.

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