KR101320325B1 - Gear Type Power Steering Pump with the shock absorbing part - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear type steering pump apparatus for generating hydraulic pressure to assist rotational force of a steering wheel for automobiles, comprising: a housing having a partition member for receiving a working fluid and partitioning a space; A cap coupled to one side of the housing to seal one side of the housing; A housing cover coupled to the other side of the housing to seal the other side of the housing; A gear pump module received between the housing and the cap and coupled to the partition member to pressurize a working fluid, the suction pump storing a working fluid sucked into the gear pump module to reduce pulsation of the sucked fluid. It includes a buffer unit and a pressure buffer unit provided in the gear pump module to reduce the pulsation of the fluid discharged from the gear pump module pressurized.
Accordingly, the pulsation of the working fluid can be more effectively prevented, and the pulsation can be prevented by making the most of the structure of the steering pump, thereby providing a gear type steering pump having a buffer part having a more compact structure.

Description

Gear Type Steering Pump with Shock Absorber {Gear Type Power Steering Pump with the shock absorbing part}

The present invention relates to a gear type steering pump having a shock absorbing portion, and more particularly to a gear type steering pump having a shock absorbing portion having an improved flow path structure for pulsation reduction in order to prevent pulsation of the gear type steering pump.

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 the improvement of fuel efficiency and environmental friendliness of the vehicle, steering pumps driven by electric motors are being developed more and more.

As an example of such a prior art, Unexamined-Japanese-Patent No. 2006-104987 (2006.4.20) is mentioned.

The prior art has a structure for preventing the pulsation (phenomena such as severe agitation of the liquid on the suction side or the discharge side of the working fluid, especially on the discharge side due to the characteristics of the gear) of the conventional gear pump. It is more preferable to equip effectively.

It is an object of the present invention to provide a gear type steering pump having a buffer shaped to more effectively prevent pulsation of the working fluid.

It is an object of the present invention to provide a gear type steering pump having a shock absorbing portion having a more compact structure.

SUMMARY OF THE INVENTION An object of the present invention is a gear type steering pump apparatus for generating hydraulic pressure to assist rotational force of a steering wheel for a vehicle, comprising: a housing having a partition member for receiving a working fluid and partitioning a space; A cap coupled to one side of the housing to seal one side of the housing; A housing cover coupled to the other side of the housing to seal the other side of the housing; A gear pump module received between the housing and the cap and coupled to the partition member to pressurize a working fluid, the suction pump storing a working fluid sucked into the gear pump module to reduce pulsation of the sucked fluid. And a shock absorbing portion provided in the gear pump module to reduce the pulsation of the fluid discharged from the shock absorbing portion and the gear pump module, wherein the gear pump module includes a gear pump housing forming an appearance, and the gear pump housing. And a gear pump inner housing including a gear pump cover for sealing the pump and a pumping part provided in the gear pump housing and pressurizing the suctioned working fluid to an interlocking pumping gear, wherein the pressure buffer part is a part of the circumferential direction of the inner housing. A space formed in the longitudinal direction along the cross-sectional area of the pressure buffer portion is the pumping It is achieved by a gear type steering pump device characterized in that from the region discharged from the unit, the working fluid becomes smaller along the flow direction in the direction discharged from the gear pump module.

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In addition, an object of the present invention is a gear-type steering pump apparatus for generating a hydraulic force to assist the rotational force of a steering wheel for a vehicle, comprising: a housing having a partition member for receiving a working fluid and partitioning a space; A cap coupled to one side of the housing to seal one side of the housing; A housing cover coupled to the other side of the housing to seal the other side of the housing; A gear pump module received between the housing and the cap and coupled to the partition member to pressurize a working fluid, the suction pump storing a working fluid sucked into the gear pump module to reduce pulsation of the sucked fluid. And a shock absorbing portion provided in the gear pump module to reduce the pulsation of the fluid discharged from the shock absorbing portion and the gear pump module, wherein the gear pump module includes a gear pump housing forming an appearance, and the gear pump housing. And a gear pump inner housing including a gear pump cover for sealing the pump and a pumping part provided in the gear pump housing and pressurizing the suctioned working fluid to an interlocking pumping gear, wherein the pressure buffer part is a part of the circumferential direction of the inner housing. A space formed in the longitudinal direction along the shape of the pressure buffer portion is the pumping portion The cross section in the area discharged from the gear is characterized in that the 'U' shape and the 'U' cross-sectional shape gradually decreases along the flow direction of the direction discharged from the gear pump module to change to one circular shape It is also achieved by a pump device.

In addition, an object of the present invention is a gear-type steering pump apparatus for generating a hydraulic force to assist the rotational force of a steering wheel for a vehicle, comprising: a housing having a partition member for receiving a working fluid and partitioning a space; A cap coupled to one side of the housing to seal one side of the housing; A housing cover coupled to the other side of the housing to seal the other side of the housing; A gear pump module received between the housing and the cap and coupled to the partition member to pressurize a working fluid, the suction pump storing a working fluid sucked into the gear pump module to reduce pulsation of the sucked fluid. And a shock absorbing portion provided in the gear pump module to reduce the pulsation of the fluid discharged from the shock absorbing portion and the gear pump module, wherein the gear pump module includes a gear pump housing forming an appearance, and the gear pump housing. And a gear pump inner housing including a gear pump cover for sealing the pump and a pumping part provided in the gear pump housing and pressurizing the suctioned working fluid to an interlocking pumping gear, wherein the pressure buffer part is a part of the circumferential direction of the inner housing. A space formed in the longitudinal direction along the pressure buffer portion inside the gear pump In the gear pump cover while gently connecting the inner wall forming the outer side of the housing, the outer wall spaced radially outward of the gear pump inner housing corresponding to the inner wall, and both ends of the space formed between the inner wall and the outer wall. It is also achieved by a gear-type steering pump device, characterized in that it comprises an inclined portion that is inclined to become narrower toward the partition member.

In addition, it is preferable that a flow path flowing from the pumping part to the pressure buffer part is formed at the gear pump cover side, and a flow path communicateably communicated with the partition member through the pressure buffer part is formed at the partition wall member side, respectively. .

The apparatus may further include a motor module that provides rotational force to the gear pump module by an externally applied power and is coupled to the other side of the housing, wherein the suction fluid buffer part is disposed between the partition member, the cap, and the gear pump module. Preferably, the first suction fluid buffer part provided as a space of the second suction fluid buffer part provided as a space between the partition member and the housing cover.

In addition, the motor module preferably includes a wet motor provided to be accommodated in the second suction fluid buffer.

According to the present invention, it is possible to more effectively prevent the pulsation of the working fluid, it is possible to prevent the pulsation by using the structure of the steering pump to the maximum, it is possible to provide a gear type steering pump having a buffer having a more compact structure.

1 is an exploded perspective view of a gear type steering pump apparatus according to an embodiment of the present invention;
Figure 2 is a partially cut perspective view partially cut in the assembled state of Figure 1,
3A is a perspective view of a gear pump inner housing,
3B is a cross-sectional view taken along line IIIb-IIIb of FIG. 3A;
Figure 3c is a perspective view showing a three-dimensional pressure buffer,
Figure 4 is a schematic diagram for explaining the flow path of the gear-type steering pump according to the present invention.

Hereinafter, an embodiment of the present invention of the gear type steering pump 100 (hereinafter, referred to as a steering pump) will be described with reference to FIGS. 1 to 4.

1 is an exploded perspective view of a gear-type steering pump apparatus according to an embodiment of the present invention, Figure 2 is a partially cut perspective view partially cut in the assembled state of Figure 1, Figure 3a is a perspective view of the gear pump inner housing 3B is a cross-sectional view taken along line IIIb-IIIb of FIG. 3A, FIG. 3C is a perspective view showing a pressure buffer unit in three dimensions, and FIG. 4 is a schematic view for explaining a flow path of a gear type steering pump according to the present invention.

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 provides a rotational force to the gear pump module 130 by a power source applied from the outside and is coupled to the motor module accommodating part 115 which is a lower side of the housing 110. The motor module 150 includes a stator 153 coupled to the housing 110, a rotor 155 rotatably provided in the current flow of the stator 153, and disposed inside the stator 153, and the rotor 155. And a motor rotation shaft 151 supported by the partition member 117 of the housing 110. That is, the stator 153 is coupled to the interior of the housing 110, the rotor is coupled to the partition member 117 of the housing 110, and the motor module 150 is connected to the second suction fluid buffer 195b. A wet motor that is received 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.

As an example of the shape of the pressure buffer unit 132, as shown in Figure 3a, 3b and 3c, the cross section in the region discharged from the pumping unit 135 is a 'U' and the gear pump module 130 According to the flow direction of the discharge direction from) is characterized in that the 'U' cross-sectional shape is gradually smaller and closer to one circle.

The pressure buffer 132 includes an inner wall 131b that forms an outer side of the gear pump inner housing 131d and an outer wall 131a spaced radially outward of the gear pump inner housing 131d in correspondence to the inner wall 131b. And an inclined portion 131c inclined so as to be gradually narrowed toward the partition member 117 in the gear pump cover 133 while gently connecting both ends of the space formed between the inner wall 131b and the outer wall 131a.

It is shown in FIG. 3C that only the pressure buffer 132 is shown in three dimensions.

The flow path flowing from the pumping part 135 into the pressure buffer part 132 is a buffer part inlet 132a formed on the gear pump cover 133 side and passes through the pressure buffer part 132 to the partition member 117. The buffer part discharge port 132b which is the flow path which can be guidedly communicated is formed in the partition member 117 side, respectively.

Accordingly, the cross section of the passage narrows rapidly in the buffer inlet 132a, which is the narrow passage, and then the cross section of the passage decreases gradually toward the buffer outlet 132b, which is the narrow passage. Is formed to effectively reduce the pulsation of the working fluid discharged under pressure 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.

Here, reference numeral 139b, which is not described, is a coupling hole to which the pump module fixing member 139a is coupled, and 139c is an o-ring for preventing fluid from leaking between the pump housing 131 and the gear pump cover 133. It is an engaging groove to which a seal member such as the back can be engaged.

Referring to FIG. 4 schematically, the effect of reducing the pulsation along the flow path of the steering pump 100 according to the present invention having such a configuration is 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.

The stored fluid of the second suction fluid buffer part 195b is pressurized by the pumping part 135 through the central suction flow path 117c formed through the central area of the partition member 117 to open the narrow buffer part suction port 132a. It is guided to the pressure buffer unit 132 of a relatively large space through the narrow cross-section is gradually guided to the discharge port 119 of the steering pump 100 through the narrow buffer outlet 132b 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.

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: outer wall 131b: inner wall
131c: inclined portion 131d: housing of the gear pump
132: pressure buffer 132a: buffer inlet
132b: buffer outlet 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 shaft 153: stator
155: rotor 170: drive circuit module
173: driving circuit module support member 175: driving circuit member
177: wiring entrance 180: housing cover
190: cap 193: inlet
195a: first suction fluid buffer 195b: second suction fluid buffer

Claims (8)

In the gear type steering pump device for generating a hydraulic force to assist the rotational force of the steering wheel for cars,
A housing having a partition member for receiving a working fluid and partitioning a space;
A cap coupled to one side of the housing to seal one side of the housing;
A housing cover coupled to the other side of the housing to seal the other side of the housing;
And a gear pump module received between the housing and the cap and coupled to the partition member to pressurize a working fluid.
Suction fluid buffer unit for storing the working fluid sucked into the gear pump module to reduce the pulsation of the suction fluid and the pressure buffer unit provided in the gear pump module to reduce the pulsation of the fluid discharged from the gear pump module pressurized Including,
The gear pump module includes a gear pump housing forming an exterior, a gear pump cover for sealing the gear pump housing, and a pumping unit configured to pressurize the working fluid provided and sucked into the gear pump housing with an interlocking pump gear. A pump inner housing,
The pressure buffer portion is a space formed in the longitudinal direction along a portion of the circumferential direction of the inner housing,
The cross-sectional area of the pressure buffer portion is a gear-type steering pump device, characterized in that the smaller along the flow direction of the direction in which the working fluid is discharged from the gear pump module from the region discharged from the pumping unit. delete delete In the gear type steering pump device for generating a hydraulic force to assist the rotational force of the steering wheel for cars,
A housing having a partition member for receiving a working fluid and partitioning a space;
A cap coupled to one side of the housing to seal one side of the housing;
A housing cover coupled to the other side of the housing to seal the other side of the housing;
And a gear pump module received between the housing and the cap and coupled to the partition member to pressurize a working fluid.
Suction fluid buffer unit for storing the working fluid sucked into the gear pump module to reduce the pulsation of the suction fluid and the pressure buffer unit provided in the gear pump module to reduce the pulsation of the fluid discharged from the gear pump module pressurized Including,
The gear pump module includes a gear pump housing forming an exterior, a gear pump cover for sealing the gear pump housing, and a pumping unit configured to pressurize the working fluid provided and sucked into the gear pump housing with an interlocking pump gear. A pump inner housing,
The pressure buffer portion is a space formed in the longitudinal direction along a portion of the circumferential direction of the inner housing,
The shape of the pressure buffer portion is a cross section in the region discharged from the pumping portion is a 'U' and the cross-sectional shape of the 'U' shape gradually decreases along the flow direction of the direction discharged from the gear pump module close to one circle Gear type steering pump device characterized in that it changes. In the gear type steering pump device for generating a hydraulic force to assist the rotational force of the steering wheel for cars,
A housing having a partition member for receiving a working fluid and partitioning a space;
A cap coupled to one side of the housing to seal one side of the housing;
A housing cover coupled to the other side of the housing to seal the other side of the housing;
And a gear pump module received between the housing and the cap and coupled to the partition member to pressurize a working fluid.
Suction fluid buffer unit for storing the working fluid sucked into the gear pump module to reduce the pulsation of the sucked fluid and the pressure buffer unit provided in the gear pump module to reduce the pulsation of the fluid discharged from the gear pump module pressurized Including,
The gear pump module includes a gear pump housing forming an exterior, a gear pump cover for sealing the gear pump housing, and a pumping unit configured to pressurize the working fluid provided and sucked into the gear pump housing with an interlocking pump gear. A pump inner housing,
The pressure buffer portion is a space formed in the longitudinal direction along a portion of the circumferential direction of the inner housing,
The pressure buffer part may include an inner wall forming an outer side of the gear pump inner housing, an outer wall spaced radially outwardly of the gear pump inner housing corresponding to the inner wall, and both ends of a space formed between the inner wall and the outer wall. Gear type steering pump device characterized in that it comprises an inclined portion inclined to narrow gradually toward the partition member from the gear pump cover while connecting smoothly. The method according to any one of claims 1, 4, and 5,
A flow path flowing from the pumping part to the pressure buffer part is formed on the gear pump cover side, and a flow path communicated so as to be guided to the partition member through the pressure buffer part, each gear is formed on the partition member side. Type steering pump device. The method of claim 1,
It further comprises a motor module for providing a rotational force to the gear pump module by the power applied from the outside and coupled to the other side of the housing,
The suction fluid buffer part,
A first suction fluid buffer part provided as a space between the partition member, the cap, and the gear pump module;
And a second suction fluid buffer provided as a space between the partition member and the housing cover. The method of claim 7, wherein
The motor module is a gear-type steering pump device, characterized in that it comprises a wet motor provided to accommodate the second suction fluid buffer.

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