KR101337835B1 - Hydraulic Power Steering Pump having Wet Type Motor with Open Type Magnet - Google Patents

Abstract

The present invention relates to a steering pump having a wet motor of an open magnet structure, comprising: a housing; A gear pump module which is always supported on one side of the housing and pressurizes the fluid; And a motor module supported on the other side of the housing to provide a driving force to the gear pump module, wherein the motor module includes: a stator supported by the housing such that current can be supplied by an applied power source; And a rotor having a rotating motor rotating shaft and a permanent magnet generating magnetic force, wherein the outer side of the permanent magnet is supported by the motor rotating shaft to have an exposed portion exposed toward the stator.
Therefore, by improving the coupling structure of the permanent magnet disposed on the rotor to improve the magnetic properties of the permanent magnet to improve the efficiency of the motor, and to simplify the structure of coupling the permanent magnet to reduce the mold cost, etc. economical Can be improved.

Description

Steering Pump with Wet Motor with Open Magnet Structure {Hydraulic Power Steering Pump having Wet Type Motor with Open Type Magnet}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering pump having an open magnetic structure wet motor, and more particularly to a steering pump having an open magnetic structure wet motor that improves the structure of the rotor of the wet motor.

Automobiles are a modern means of transportation that combines many components. Such an automobile usually rotates the steering wheel to adjust the traveling direction of the automobile. Accordingly, the wheel connected to the steering wheel is rotated so that the driver runs while adjusting the driving direction of the vehicle. Among the various parts of the vehicle, the steering device functions to adjust the driver to proceed as the driver intends.

Among such steering apparatuses, there is a hydraulic power steering apparatus provided with a pump for supplying hydraulic pressure for assisting a rotational force of a steering wheel provided by a driver so that the driver can more easily rotate the steering wheel.

This hydraulic power steering apparatus (hereinafter referred to as a " steering apparatus ") is a system in which a hydraulic power supplied from a steering pump provided in the middle of a steering linkage connected to a steering wheel is energized by a power steering gear, (Front wheel or rear wheel) to increase the steering force, allowing the driver to make light and quick steering with little force. That is, the steering apparatus can reduce the steering force of the steering wheel by the driver and prevent the impact from being transmitted from the road surface to the steering wheel through the front wheel.

Such a steering apparatus includes an input transmission mechanism for generating steering force to transmit steering force or changing steering force direction, a power supply mechanism for generating steering aid force or reducing steering assist force, and appropriately converting input torque and displacement or steering force. Usually composed of an output mechanism for changing the direction of. Here, the input transmission mechanism includes a steering wheel, a drag link and a steering linkage such as an intermediate shaft, the power boost mechanism includes a steering pump, a control valve, and the output mechanism includes a steering gear, a tie rod, and a power cylinder. End and the like.

On the other hand, the steering pump is generally divided into two types depending on how it is driven. One is powered by the engine and the other is powered by a separate electric motor without the power from the engine. In recent years, there has been a preference for an electrically driven steering pump capable of operating a steering pump only when it is necessary to seek a more efficient and environmentally friendly automobile.

The steering pump system including such an electrically driven steering pump has a somewhat different structure from the conventional engine driven steering pump. The steering pump system includes an electric motor for providing power, a pump assembly for compressing the fluid by rotation of the electric motor, a housing for supporting and guiding the electric motor and the pump assembly, and an angle-steering pump And a control unit for controlling the electric motor based on the pressure and the like.

The steering pump sucks oil through the suction hose and discharges the compressed oil as the pumping gear rotates by driving the engine or the electric motor. In addition, the steering pump is generally combined with a flow control valve for controlling the amount of oil discharged. That is, since the discharge amount per revolution of the steering pump is constant, the discharge amount per unit time increases and decreases in proportion to the engine rotation speed. And, the steering pump is provided with a relief valve that can adjust the maximum value of the fluid pressure issued so that the high pressure is not operated more than necessary.

In recent years, in view of improving fuel economy of vehicles and environmentally friendly trends, steering pumps driven by electric motors are being developed more and more, and a wet motor through which a working fluid passes through a motor is more preferable in consideration of cooling and the like.

An example of such a prior art is Korean Patent Publication No. 2006-5340 (2006.01.17).

The prior art drive motor 12 of FIG. 1 has a rotor 36, a shaft 38 coupled to the rotor 36, and a stator 40 disposed around the rotor 36. Here, the rotor 36 has a structure that completely surrounds the permanent magnet provided therein with a cover made of metal, thereby lowering the magnetic properties of the permanent magnet, increasing the cost of manufacturing a mold, etc., and the structure is complicated. And the cost of manufacturing, assembly, etc. is increased and the economical efficiency is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a steering pump having a wet motor of an open magnet structure which can improve the efficiency of the motor by improving the coupling characteristics of the permanent magnets disposed on the rotor to improve the magnetic properties of the permanent magnets. will be.

In addition, another object of the present invention is to provide a steering pump having a wet motor of an open magnet structure which can simplify the structure of coupling the permanent magnets, thereby reducing the mold cost and the like and improving the economics.

Still another object of the present invention is to provide a steering pump having a wet motor of an open magnet structure which can simplify the structure and simplify the manufacturing, assembly, and the like process.

An object of the present invention, the housing; A gear pump module which is always supported on one side of the housing and pressurizes the fluid; And a motor module supported on the other side of the housing to provide a driving force to the gear pump module, wherein the motor module includes: a stator supported by the housing such that current can be supplied by an applied power source; And a rotor having a rotating motor rotating shaft and a permanent magnet generating magnetic force, the outer side of the permanent magnet being supported by the motor rotating shaft to have an exposed portion exposed toward the stator, wherein the rotor is coupled to the motor rotating shaft. And a plurality of yoke holders, a yoke supported by the yoke holder, and a plurality of the permanent magnets disposed outside the yoke, wherein the yoke holder supports one end along the longitudinal direction of the motor rotation shaft of each of the permanent magnets. Wet of the open magnet structure, characterized in that the permanent magnet gripping portion is provided It is achieved by means of a steering pump having an emitter.

In addition, the rotor is preferably disposed in the flow of the fluid.

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In addition, the yoke holder preferably includes a rib that partitions the circumferential direction of the yoke holder such that the permanent magnets are spaced apart when the permanent magnets are arranged in the circumferential direction of the yoke holder.

In addition, it is preferable to further include a separation preventing cap member having a skirt surrounding the other end of the permanent magnet in the longitudinal direction of the motor shaft so that the respective permanent magnets coupled to the yoke does not deviate in the circumferential direction.

According to the present invention, it is possible to improve the efficiency of the motor by improving the magnetic properties of the permanent magnet by improving the coupling structure of the permanent magnet disposed on the rotor, and to reduce the mold cost by simplifying the structure of coupling the permanent magnet Therefore, it is possible to provide a steering pump having an open magnet structure wet motor which can improve the economics, and can simplify the manufacturing and assembly process by simplifying the structure.

1 is an exploded perspective view of a steering pump according to an embodiment including a motor of the present invention,
Fig. 2 is a partially cutaway perspective view of Fig. 1,
3 is an exploded perspective view of the rotor of FIG. 1;
4 is a cross-sectional view of Fig.

Hereinafter, an embodiment of a steering pump having a wet motor of an open magnet structure according to the present invention will be described with reference to FIGS. 1 to 4.

1 is an exploded perspective view of a steering pump according to an embodiment including a motor of the present invention, FIG. 2 is a partially cutaway perspective view of FIG. 1, and FIG. 3 is an exploded perspective view of the rotor of FIG. 1, and FIG. 4 is a cross-sectional view of FIG. 3.

The steering pump 100 according to the present invention for generating the oil pressure assisting the rotational force of the steering wheel for the automobile is a gear type pump among pump types. 1 and 2, the steering pump 100 includes a housing 110 having a partition member 117 that receives a working fluid and defines a space, and a housing 110 coupled to one side of the housing 110 A cap 190 for sealing one side of the housing 110, a housing cover 180 coupled to the other side of the housing 110 to seal the other side of the housing 110, And a gear pump module 130 which is accommodated between the gear pump module 190 and the partition member 117 to pressurize the working fluid. The working fluid sucked into the gear pump module 130 is stored, And includes a suction buffer portion 195a for reducing pulsation and a pressure buffer portion 132 provided for the gear pump module 130 so as to reduce the pulsation of the fluid discharged from the gear pump module 130 do.

Hereinafter, the vertical direction in Figs. 1 and 2 will be referred to as a vertical direction for convenience, if necessary.

The housing 110 preferably has a sufficient rigidity to substantially form an outer appearance of the steering pump 100 and to support or accommodate various configurations. The housing 110 may be made of a steel material, It is preferable to be made by casting including a material including an aluminum-based alloy.

The housing 110 has a partition member 117 which divides the space vertically inside. A gear pump module accommodating portion 113 capable of accommodating the gear pump module 130 is formed on the upper side of the partition wall member 117 and a motor module accommodating portion 113 accommodating the motor module 150 (Not shown).

The discharge port 119 is formed at one side of the partition member 117 so that the pressurized working fluid is discharged from the steering pump 100 to provide an auxiliary force to the steering wheel. As shown in FIG.

A shaft hole 117a is formed at a central portion of the partition member 117 so as to transmit the rotational force of the motor module 150 to the gear pump module 130 and a working fluid is supplied to the second suction fluid buffer part 195b A central suction flow path 117c formed so as to communicate with the gear pump module 130 and a flow of fluid from the first suction fluid buffering part 195a to the second suction fluid buffering part 195b, One or more upper and lower suction passages 117b are formed so as to be guided.

The motor module 150 includes a wet motor accommodated in the second suction fluid buffer 195b and in contact with the working fluid.

The steering pump 100 applies power to the motor module 150 and controls the driving of the motor module 150, the driving control of the motor module 150, the transmission and reception of various signals, And a module 170. The module 170 includes a plurality of modules. The driving circuit module 170 includes a driving circuit member 175 including a PCB and the like for transmitting and receiving various signals and the like so that the driving circuit member 175 is supported and the driving circuit member 175 is isolated from the working fluid. And a driving circuit module supporting member 173 coupled to the housing 110.

Reference numeral 177 denotes a wiring access port through which electric wires, cables, and the like connected to the drive circuit module 170 or the motor module 150 can enter and exit.

The gear pump module 130 includes a gear pump housing 110, a gear pump cover 133 that seals the gear pump housing 110, and a gear pump cover 133, which is provided inside the gear pump housing 110, And a pumping portion 135 that presses the pumping gear 135a. The gear pump module 130 includes a pump module fixing member 139a including a bolt for coupling the gear pump module 130 to the partition member 117 and a discharge pressure of a high pressure pressurized by the pumping unit 135. When included, the relief valve 139 is discharged to the low pressure portion. Here, the high pressure working fluid of the pressure buffer 132 discharged from the relief valve 139 may be discharged to the first suction fluid buffer 195a in which the low pressure fluid is stored.

In the gear pump housing 110, a pumping portion 135 for pressurizing a low-pressure working fluid with a high-pressure working fluid is accommodated in the pumping portion accommodating portion 136.

The pumping unit 135 includes a pumping gear 135a engaged with each other to pressurize a low pressure working fluid with a high pressure working fluid, a gear housing 110 for supporting a pair of pumping gears 135a at both ends, and a pumping gear. Is provided to rotate (135a) is provided with a rather long gear pump rotary shaft 137 and a rather short gear pump rotary shaft 137b coupled to the motor rotary shaft 151.

The pressure buffering part 132 is a space formed in the vertical direction along a part of the circumferential direction of the gear pump inner housing 131d and the cross sectional area of the pressurizing buffering part 132 is moved from the area discharged from the pumping part 135 And is gradually reduced along the flow direction in the direction in which the fluid is discharged from the gear pump module 130.

The cross section in the region discharged from the pumping portion 135, which is not shown in the figure of the pressurizing buffer 132, is 'U' and 'U' is formed along the flow direction in the direction of being discharged from the gear pump module 130. [ And the cross-sectional shape of the magnetic substance gradually decreases to be close to one circular shape.

As a result, the cross-sectional area of the flow path gradually decreases from the cushioning air inlet (not shown), which is a narrow flow path, to the cushioning air outlet (not shown) 132 can be formed and the pulsation of the pressurized and discharged working fluid can be effectively reduced through the space called the pressure buffer 132. [

The suction fluid buffering portions 195a and 195b include a first suction fluid buffering portion 195a provided as a space between the partitioning member 117, the cap 190 and the gear pump module 130, And a second suction fluid buffer part 195b provided as a space between the member 117, the housing cover 180 and the motor module 150. [ That is, it is possible to form a maximum space as much as possible so that the working fluid itself can absorb the pulsation generated in the working fluid by the movement of the working fluid sucked and compressed by the pumping gear 135a of the pumping part 135. [

The cap 190 is coupled to the upper side of the housing 110 so that the working fluid received in the first suction fluid buffer part 195a is not leaked. A suction port 193 for guiding a working fluid introduced from a tank (not shown) or the like storing a working fluid to the steering pump 100 is formed at one side of the cap 190. Of course, the suction port 193 may also be formed in the housing 110 as needed. The cap 190 is preferably molded of a plastic composite material to reduce weight.

The effect of reducing the pulsation according to the flow path of the steering pump 100 according to the present invention having such a configuration will be briefly described as follows.

First, in the gear type steering pump 100, the discharge amount of the pump gear 135a is repeatedly increased or decreased due to the characteristics thereof, and the increase or decrease of the discharge amount leads to the pulsation of the steering pump 100. [ On the other hand, the pulsation on the discharge side leads to the pulsation on the suction side. In order to prevent the pulsation of the suction side or the discharge side, a working fluid stored in a large space has a large space on the flow path through which the working fluid is sucked or discharged, thereby reducing such pulsation. It is possible to prevent the pulsation from being transmitted to the other flow channel.

That is, in the process of sucking the working fluid into the pumping part 135, the working fluid in the narrow suction port 193 is guided to the first suction fluid buffer part 195a, which is a large storage space, Is guided to the second suction fluid buffer part 195b which is a large space by the narrow upper and lower suction flow path 117b.

In addition, the stored fluid of the second suction fluid buffer part 195b is pressurized by the pumping part 135 through a central suction flow path 117c formed through the central area of the partition member 117 to narrow the buffer part suction port (not shown). It is guided to the pressure buffer unit 132 of a relatively large space through the narrow cross-sectional area is gradually guided to the discharge port 119 of the steering pump 100 through the narrow buffer discharge port to operate with the pressurized working fluid. In other words, the volume of the flow path of the working fluid can be largely changed to prevent pulsation on the discharge side or the suction side in the greatly changed working fluid.

Thus, the pulsation of the working fluid sucked or discharged into the pumping section 135 can be effectively reduced through the suction member cushions 195a, 195b and the pressure cushioning section 132. The suction member buffering portions 195a and 195b can utilize the space formed by the pump housing, the cap 190 and the housing cover 180 as much as possible, and the pressure buffering portion 132 is formed in the pump housing 110 So that the steering pump 100 can be more compactly formed.

The motor module 150 is coupled to or supported by the motor module receiving portion 115 of the housing 110. The motor module 150 is provided so that current can be supplied by a power source applied from the outside, and the stator 153 is supported on the housing 110 and is rotatably provided in correspondence with the stator 153 to form a central region of the housing 110. The rotor 155 is coupled to the phosphor partition member 117 and includes a permanent magnet 161 and a motor rotation shaft 151. The outer side of the permanent magnet 161 includes an exposed portion 161a exposed toward the stator 153.

Since the stator 153 is the same as the general motor module 150, a detailed description thereof will be omitted below.

The rotor 155 is permanently coupled with the yoke holder 157 coupled to the motor rotation shaft 151, the yoke 159 coupled to the yoke holder 157, and the other side coupled to the release preventing cap member 163, respectively. A magnet 161 is provided.

The yoke holder 157 is coupled to the motor rotation shaft 151, and the permanent magnet bite to which the yoke coupling portion 157c and the permanent magnet 161 are engaged may be coupled to each other so that the yoke 159 is coupled to the upper side. Part 157a is formed, respectively. The yoke coupling portion 157c and the permanent magnet bit 157a may be provided in various shapes corresponding to the shapes of the yoke 159 and the permanent magnet 161. In addition, if necessary, when bonded to the yoke coupling portion 157c and the permanent magnet bleeding portion 157a, an adhesive may be used to improve the bonding force.

On the other hand, the yoke holder 157 is preferably provided with a rib (157b) formed between the permanent magnet 161 so that the plurality of permanent magnets 161 coupled in the circumferential direction is partitioned spaced apart in the circumferential direction. The rib 157b may be inclined to the motor shaft 151 and the inclined portion so as to generate a flow of fluid in the gap between the rotor 155 and the stator 153 as the rotor 155 rotates. It may be formed. Thus, by inducing the flow of the fluid between the stator 153 and the rotor 155 it can be obtained to effectively release the heat generated in the motor module 150.

Then, after the yoke 159 and the permanent magnet 161 are coupled to the yoke holder 157, a separation preventing cap member 163 is provided to fix the upper side of the yoke 159 and the permanent magnet 161. In this case, the release preventing cap member 163 has a skirt 163a bent downward from the upper plate surface so as to surround the upper end of the permanent magnet 161 or the upper end of the yoke 159 in the circumferential direction as necessary. Doing. Accordingly, the inner side of the permanent magnet 161 is coupled to the yoke 159 and the adhesive, and the lower end outer side is supported by the permanent magnet bleed portion 157a (see 'K3' in FIGS. 3 and 4) and the upper end outer side. Silver skirt 163a is supported (see section 'K1' in FIGS. 3 and 4) and the outer central region of permanent magnet 161 forms an exposed portion 161a which is exposed toward rotor 155 (FIG. 3 and 4, the 'K2' part.

Referring to Figures 3 and 4 the manufacturing process of the motor module 150 according to the present invention having such a configuration as follows.

First, the yoke holder 157 is coupled to the motor rotation shaft 151. The yoke holder 157 is formed with the above-mentioned permanent magnet bite portion 157a, rib 157b and yoke engaging portion 157c, respectively.

Next, the yoke 159 is coupled to the upper side of the recessed yoke coupling portion 157c of the yoke holder 157.

After the yoke 159 is coupled, an adhesive or the like is applied to the yoke 159 in contact with the yoke 159, and then the plurality of permanent magnets 161 are coupled to the permanent magnet bit 157a. The plurality of permanent magnets 161 may be arranged to be spaced apart from each other in the circumferential direction by the rib 157b.

Then, the permanent magnet 161 is circumferentially formed by the end of the permanent magnet 161 surrounded by the skirt 163a by engaging the release preventing cap member 163 on the upper side of the permanent magnet 161 and the yoke 159. The yoke holder 157 may be firmly supported so as not to be separated from the direction to the upper side.

Accordingly, both ends of the permanent magnet 161 are not separated in the radial direction or the longitudinal direction by the permanent magnet bleed portion 157a and the skirt 163a, respectively, and the central region of the permanent magnet is exposed to the outside in the circumferential direction. Each of the exposed portions 161a may be formed.

Here, the data compared according to the prior art and the present invention are as follows.

First, Table 1 shows experimental data when the permanent magnet of the rotor is completely enclosed by the prior art and experimental data when the permanent magnet of the rotor is exposed as in the present invention.

Torque Speed Print input electric current Voltage efficiency N-m rpm kW W A V % Prior art 0.600 2235 0.140 220.5 17.60 12.31 63.7 1.200 1098 0.138 384.4 34.54 11.13 35.9 Invention 0.600 3193 0.202 270.14 20.16 13.40 74.7 1.200 2816 0.352 462.21 34.91 13.24 76.2 Remarks

As can be seen in Table 1, a case in which a constant torque of 0.600 Nm is generated is compared. In the related art, the efficiency is 63.7%, but in the present invention, the efficiency is 74.2% and the efficiency is increased by about 16%. have. In addition, when comparing the torque of 1.2 N-m, it can be seen that the efficiency is 35.9% in the prior art, but the efficiency is 74.7% in the present invention, which is much higher than the prior art.

Thus, unlike the prior art, since the exposed portion 161a of the permanent magnet 161 may be provided to the maximum, the magnetic force generated by the permanent magnet 161 may not be disturbed, thereby improving the magnetic characteristics, thereby improving the efficiency of the motor. You can. In addition, since the structure does not completely surround the permanent magnets, the structure for supporting the permanent magnets may be more simply and conveniently used, thereby reducing costs such as mold costs. On the other hand, it has a simple structure can reduce the requirements of the parts, and can simplify the assembly, manufacturing, etc. can improve the economics.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the invention. will be. The scope of the invention will be determined by the appended claims and their equivalents.

100: gear type steering pump device 110: housing
113: Gear pump module accommodating part 115: Motor module accommodating part
117: partition wall member 117a:
117b: upper and lower suction flow path 117c:
119: Outlet
130: Gear pump module 131: Gear pump housing
131a: inner wall 131b: outer wall
131c: inclined portion 131d: housing of the gear pump
132: pressure buffering part 133: gear pump cover
135: pumping section 135a:
135b: gear housing 137: gear pump rotating shaft
137b: Rotation speed of gear pump 139: Relief valve
139a: pump module fixing member
150: motor module 151: motor rotation shaft
153: stator 155: rotor
157: yoke holder 157a: permanent magnet portion
157b: Rib 159: York
161: permanent magnet 161a: exposed portion
163: separation prevention cap member 163a: skirt
170: driving circuit module 173: driving circuit module supporting member
175: Driver circuit member 177:
180: housing cover 190: cap
193: Suction port 195a: First suction fluid buffer
195b: second suction fluid buffer

Claims (5)

A housing;
A gear pump module which is always supported on one side of the housing and pressurizes the fluid;
And a motor module supported on the other side of the housing to provide a driving force to the gear pump module.
The motor module includes a stator supported by the housing to allow current to be supplied by an applied power source, a rotor having a motor rotation shaft rotated by the stator and a permanent magnet generating a magnetic force,
The outer side of the permanent magnet is supported on the motor rotation shaft to have an exposed portion exposed toward the stator,
The rotor includes a yoke holder coupled to the motor rotation shaft, a yoke supported by the yoke holder, and a plurality of the permanent magnets disposed outside the yoke,
The yoke holder is a steering pump having a wet motor of an open magnet structure, characterized in that the permanent magnet gripping portion is formed to be supported at one end along the longitudinal direction of the motor rotation axis of each of the permanent magnets. The method of claim 1,
Wherein said rotor is disposed in the flow of fluid. delete The method of claim 1,
The yoke holder includes a rib for partitioning the circumferential direction of the yoke holder such that the permanent magnets are spaced apart when the permanent magnets are disposed in the circumferential direction of the yoke holder, respectively. Steering pump having. The method of claim 1,
And a separation preventing cap member having a skirt surrounding the other end of the permanent magnet along the longitudinal direction of the motor rotation shaft such that each of the permanent magnets coupled with the yoke does not deviate in the circumferential direction. Steering pump with wet motor of magnetic structure.

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