KR20110063121A - Water pump for vehicle - Google Patents

Abstract

PURPOSE: A water pump for a vehicle is provided to prevent the slip between a pulley and a clutch disc since frictional heat is actively radiated through the heat radiating holes of a pulley and thus the decrease of the frictional force between the pulley and the clutch disc is prevented. CONSTITUTION: A water pump(100) for a vehicle comprises a pulley(130), a brake pad, a clutch disc(220), a hub(230), a return spring(240), filed coils(260) and a main shaft(270). The pulley comprises a through hole, a clutch chamber(135) and at least one heat radiating hole(191). The clutch chamber is formed on the rear along the circumferential surface of the through hole. The heat radiating hole is formed on the trajectory of the brake pad. The clutch disc selectively makes tight contact with the brake pad in the clutch chamber. The hub is coupled to the through hole through a pulley bearing(133). The hub is connected to the clutch disc through a plurality of spring pins(231). The return spring applies resilient force to the clutch disc.

Description

Car Water Pump {WATER PUMP FOR VEHICLE}

An exemplary embodiment of the present invention relates to a water pump applied to a vehicle, and more particularly, to a vehicle water pump to which an electronic clutch is applied.

Currently, vehicle makers are trying to achieve two goals: improving fuel economy and reducing emissions in the process of developing a vehicle. Among them, the catalyst of the exhaust system is increased despite the significant increase in cost and weight to meet emission regulations. Increasing the load or increasing the capacity of the EGR cooler is applied.

In general, a method of forcibly circulating a coolant is applied to a vehicle. For this purpose, a coolant path is formed in a cylinder and a cylinder head of an engine, and a coolant path is forcibly supplied to a coolant path by a water pump to maintain a stable engine temperature. Let's do it.

The water pump for supplying the coolant is operated by the power transmitted through the belt to circulate the coolant to the "radiator → cylinder → cylinder head → radiator" to prevent the engine from overheating and deterioration.

The water pump rotates the central impeller with about 6 blades by the power of the engine transmitted through the belt to pump the coolant to the cylinder.The rotation speed is set differently according to the ratio of the pulley, It rotates at 1.2 ~ 1.6 times speed.

Since the water pump is operated by the power transmitted through the belt at the same time as the engine starts, the water pump is always operated according to the operation of the engine regardless of the warm-up condition or the cooling condition of the engine to circulate the coolant.

Thus, while the engine is warmed up, fuel economy and exhaust gas can be stabilized. However, when the engine is started while the engine is sufficiently cooled, the warm-up time of the engine is delayed according to the circulation of the coolant, and thus cooling is performed. The friction resistance of the driven part is increased, causing a problem of increased wear.

In addition, the combustion efficiency is lowered due to the cooling of the engine, the fuel consumption is increased, the temperature rise of the exhaust gas is delayed, and the activation time of the catalyst is delayed. It implies

In addition, the fuel pump acts as a load on the crankshaft according to the regular operation of the fuel pump, thereby lowering the output efficiency of the engine, thereby causing a problem of lowering fuel efficiency.

This occurs because the water pump is not mechanically intermittent but only mechanically coupled in the process of interlocking with the crankshaft by the belt.

Exemplary embodiments of the present invention have been created to improve the above problems, by applying an electronic clutch, controlling the operation of the electronic clutch in accordance with the operating conditions of the engine and the temperature of the coolant, such as pumping of the coolant is optional. It provides a vehicle water pump to be made.

To this end, a water pump for a vehicle according to an exemplary embodiment of the present invention includes a pulley having a through hole formed at a center thereof, and a clutch chamber formed on a rear surface of the clutch through the periphery of the through hole. A brake pad mounted to the brake pad, iii) a clutch disk selectively installed in close contact with the brake pad in the clutch chamber of the pulley, and iii) a pulley bearing coupled to the through hole of the pulley and mounted at an outer circumferential end thereof. A hub interconnected with the clutch disk via a plurality of spring pins, iii) a return spring mounted between the clutch disk and the hub and exerting a resilience force to the clutch disk, and iii) a pulley of the pulley. A field coil installed inside the clutch chamber and wrapped around the back of the clutch disk with a coil case and a cover; It is rotatably installed in the body through a pump bearing, one end is connected to the center of the hub, the other end includes a main shaft connected to the impeller with a sealing unit interposed, the pulley of the brake pad At least one heat dissipation hole is formed on the trajectory.

In the vehicle water pump, the heat dissipation holes may be spaced apart from each other as a pair in a direction toward the center of the through hole, and may be continuously spaced apart from each other along the circumferential direction of the pulley.

In the vehicle water pump, the heat radiating holes may be arranged in a lattice form along the circumferential direction of the pulley on the trajectory of the brake pad.

In addition, the water pump for a vehicle according to an exemplary embodiment of the present invention, on the opposite side of the surface on which the brake pad is mounted on the pulley to form the heat dissipation grooves of the slot type spaced apart at regular intervals along the trajectory of the brake pad do.

In the vehicle water pump, the heat dissipation groove may be formed as a half moon shape along the direction toward the center of the through hole.

In the vehicle water pump, the heat dissipation hole and the heat dissipation groove may be alternately disposed along the circumferential direction on the trajectory of the brake pad.

According to the water pump for a vehicle according to the exemplary embodiment of the present invention as described above, by operating the clutch electronically in accordance with the operating conditions of the engine, the temperature of the coolant, the driver's will to transfer or block the power of the pulley to the impeller In this manner, pumping of the coolant through the impeller may be made selectively.

Therefore, in the present embodiment, it is possible to secure stable emissions without adding a loading amount of the catalyst for purifying exhaust gas, thereby providing cost reduction, and since the exhaust system components are not added separately, the weight of the vehicle is reduced to improve fuel economy. The expected effect is expected.

In addition, in the present embodiment, when the initial start is performed while the engine is cooled, the circulation of the coolant is blocked, so that the temperature of the engine oil can be quickly increased, thereby reducing oil friction and minimizing wear of each driving component, thereby improving durability. The effect is expected.

In this embodiment, the circulation of the coolant is actively controlled during the initial start-up of the engine, thereby improving fuel economy by reducing the activation time of the engine and stable combustion, and providing the emission stabilization by shortening the activation time of the catalyst. It is expected.

In addition, in the present embodiment, since the heat dissipation holes and / or heat dissipation grooves are formed on the opposite side to the surface on which the brake pad of the pulley is mounted, the heat dissipation amount of friction heat through the pulley can be maximized, and the heat dissipation holes and / or Alternatively, the frictional heat radiated through the heat dissipation grooves may be cooled while directly contacting the outside air.

Therefore, in this embodiment, since the frictional heat generated by the frictional force between the clutch disc and the brake pad can be actively radiated through the pulley, slippage between the pulley and the clutch disc can be prevented because the friction force between the pulley and the clutch disc is not reduced. In addition, the effect of improving the power transmission efficiency through the clutch disk is expected.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to those shown in the drawings.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. In the drawings, the thicknesses of parts and regions are exaggerated for clarity.

1 is an exploded perspective view showing the configuration of a water pump for a vehicle according to an exemplary embodiment of the present invention, Figure 2 is a combined cross-sectional view of FIG.

Referring to the drawings, the vehicle water pump 100 according to an exemplary embodiment of the present invention is to forcibly supply the cooling water to the cooling channel as the power of the engine delivered through the belt to maintain a stable temperature of the engine.

The vehicle water pump 100 is basically connected to the pump body 110, the crankshaft of the engine and rotatably coupled to one side of the pump body 110, the pulley 130 receives the power of the engine through the crankshaft And an impeller 150 rotatably mounted to the pump body 110 according to the rotation of the pulley 130 and pumping the coolant.

Therefore, the pulley 130 is rotated at a predetermined rate by the power transmitted from the crankshaft through the belt as the engine is started. As a result, the impeller 150 rotates to pump the coolant.

Therefore, the cooling water is pumped to the cooling channel formed in the cylinder (not shown) by the rotational force of the impeller 150 to maintain the engine temperature in a stable state.

In the present embodiment, the vehicle water pump 100 may apply an electronic clutch, and may control the operation of the electronic clutch according to the driving condition of the engine, the temperature condition of the coolant, and the driver's will to selectively pump the coolant. It is done as a structure.

To this end, the vehicle water pump 100 according to the exemplary embodiment of the present invention is basically provided with the pump body 110, the pulley 130, and the impeller 150 mentioned above, and the brake pad 210 and And a clutch disc 220, a hub 230, a return spring 240, a field coil 260, and a main shaft 270.

The pump body 110 forms a coolant inlet 111 for introducing coolant, and has a pulley 130 that is selectively connected to one end of the main shaft 270 to be described below and rotates on one side. The impeller 150 is connected to the other end of the main shaft 270 and rotates on the other side.

In the above, the pulley 130 is a power transmission through the belt from the crankshaft (not shown in the figure) of the engine, the through hole 131 is formed in the center, the through hole 131 in the pulley bearing 133 is installed.

Here, the clutch chamber 135 is formed on the rear surface of the pulley 130 along the circumference of the through hole 131, and the inner surface of the clutch chamber 135 is provided for mounting the brake pad 210 described later. The mounting groove 137 is formed along the through hole 131.

The brake pad 210 is formed of a steel material having a ring shape, and is mounted on the rear surface of the pulley 130 and is bonded to the mounting groove 137 of the inner surface of the clutch chamber 135 to be bonded to each other.

The clutch disc 220 is disposed in the clutch chamber 135 of the pulley 130 to correspond to the brake pad 210, and is formed in the form of a disc of a metal material that can be in close contact with the brake pad 210.

In this case, the clutch disk 220 has a long hole 221 is formed as a slot divided into a predetermined section along the circumferential direction, the output of the power supplied to the pulley 130 according to whether or not the engagement with the brake pad (210). Whether or not is controlled.

The hub 230 is rotatably coupled to the through hole 131 of the pulley 130 through the pulley bearing 133, and is connected to the clutch disk 220 through the plurality of spring pins 231.

In the above, the spring pins 231 are connected to the outer circumferential end of the hub 230 and the inner circumferential end of the clutch disc 220, respectively, and the first mounting hole 233 and the clutch formed at the outer circumferential end of the hub 230. It is installed to be connected to the second mounting hole 223 formed in the inner circumferential end of the disk 220.

That is, the spring pins 231 pass through the first and second mounting holes 233 and 223, and one end thereof is supported by the outer circumferential end of the hub 230, and the other end thereof is the inner circumference of the clutch disc 220. Supported at the end.

The return spring 240 is formed as a compression coil spring mounted to the spring pin 231 between the clutch disk 220 and the hub 230, and serves to exert elastic force to the clutch disk 220.

The field coil 260 generates magnetic force by receiving power according to an external control signal, and is installed to correspond to the rear surface of the clutch disc 220 in the clutch chamber 135 of the pulley 130.

The field coil 260 is installed in a coil case 261 that can be magnetized by a magnetic force. The field coil 260 is surrounded by a cover 263 covered by the coil case 261 and disposed inside the coil case 261. .

Here, the coil case 261 is formed with a long hole 262 as a slot partitioned at regular intervals along the circumferential direction.

The main shaft 270 is rotatably mounted to the pump body 110 through a pump bearing 271, one end is connected to the center of the hub 230, the other end sealing the pump body 110. The sealing unit 273 is connected to the impeller 150 has been mentioned in the state interposed.

Therefore, according to the vehicle water pump 100 according to the exemplary embodiment of the present invention configured as described above, the clutch disk 220 in the general state that the power is not applied to the field coil 260 first in FIG. As described above, the brake spring 210 is in close contact with the brake pad 210 by the elastic force of the return spring 240.

Thus, when the power of the engine is provided to the pulley 130 through the belt, since the clutch disc 220 is connected to the hub 230 through the spring pin 231 and is in close contact with the brake pad 210, the pulley ( As the engine power is transmitted to the main shaft 270 through the clutch disc 220 and the hub 230 according to the rotation of the 130, the main shaft 270 rotates, so that the impeller 150 is the main shaft 270. It rotates and pumps the coolant.

The pumping of the coolant as described above is performed under the condition that the engine operates at high speed because the engine speed exceeds the set reference speed, or the engine speed is less than the reference speed or the temperature of the coolant is higher than the set temperature.

In addition, the pumping of the coolant is performed to provide rapid heating of the room when the heater switch is detected as operating on regardless of the engine speed and the temperature of the coolant.

However, when the condition does not satisfy the above conditions, for example, when the engine operates at a low speed or when the temperature of the coolant is less than the set temperature, or when the heater switch is detected as off, the field coil 260 according to an external control signal. ) Generates a magnetic force by receiving power.

Accordingly, while the coil case 261 is magnetized by the magnetic force generated in the field coil 260, the coil case 261 pulls the clutch disc 220 as the magnetic force as shown in FIG.

Then, the clutch disk 220 is separated from the brake pad 210 while moving toward the coil case 261 while overcoming the elastic force of the return spring 240.

Therefore, as the clutch disc 220 is separated from the brake pad 210 as described above, the connection between the clutch disc 220 and the brake pad 210 is intermittent, and thus the clutch disc 220 is transmitted to the main shaft 270 through the hub 230. As the power is cut off, the pulley 130 is idle, and the impeller 150 stops the pumping of the coolant while not rotating.

As described above, the vehicle water pump 100 according to the exemplary embodiment of the present invention operates the clutch electronically by an external control signal according to the operating condition of the engine and the temperature condition of the coolant, and so on of the pulley 130. Since power is transmitted to or blocked from the impeller 150, pumping of the coolant through the impeller 150 is selectively performed.

As a result, in this embodiment, a stable emission can be secured without adding a loading amount of a catalyst for purifying exhaust gas, thereby providing cost reduction, and since the exhaust system parts are not added separately, the weight of the vehicle is reduced to improve fuel economy. It becomes possible.

In addition, in the present embodiment, when the initial start is performed while the engine is cooled, the circulation of the coolant is interrupted, so that the temperature of the engine oil can be quickly increased, thereby reducing oil friction and minimizing wear of each driving part, thereby improving durability. .

In this embodiment, the circulation of the coolant is actively controlled at the initial start of the engine, thereby improving fuel economy by reducing the activation time of the engine and stable combustion, and providing the emission stabilization by shortening the activation time of the catalyst. do.

On the other hand, according to the vehicle water pump 100 according to an exemplary embodiment of the present invention, the condition that the power is not applied to the field coil 260, that is, the clutch disk 220 and the brake pad 210 is the return spring 240 When the impeller 150 rotates and pumps the coolant in a state in which the impeller 150 is in close contact with the elastic force of the friction force, frictional heat is generated between the clutch disc 220 and the brake pad 210.

In detail, since the friction occurs between the clutch disc 220 and the brake pad 210 according to the driving conditions, the heat generated at this time is greater as the friction moment is shorter.

In addition, since the brake pad 210 is fixed to the pulley 130, heat generated in the brake pad 210 by the operation of the clutch disc 220 is generated through the pulley 130.

Here, an increase in the surface temperature of the brake pad 210 due to the friction force between the clutch disk 220 and the brake pad 210 lowers the friction force, and when the friction force drops, the slip between the pulley 130 and the clutch disk 220 is reduced. This occurs to further worsen the friction conditions of the clutch disc 220 and the brake pad 210.

In addition, such a decrease in frictional force causes a loss of power transmission in a path in which the rotational power of the engine is transmitted to the impeller 150, and acts as a factor of losing the function of power transmission.

Accordingly, the vehicle water pump 100 according to the exemplary embodiment of the present invention may constitute a pulley 130 having heat dissipation means 190 for dissipating frictional heat transmitted to the pulley 130 and cooling it as outside air. have.

In the present embodiment, the heat dissipation means 190 has a heat dissipation hole 191 and the heat dissipation groove 192 formed on the mounting trajectory of the brake pad 210 in the pulley 130 as shown in FIGS. Include.

The heat dissipation hole 191 is formed as a heat dissipation hole penetrated on the brake pad 210 trajectory of the pulley 130, and is spaced apart from each other as a pair in a direction toward the center C of the through hole 131. And spaced apart from each other along the circumferential direction of the pulley 130 and continuously arranged.

At this time, since the brake pad 210 is mounted on the inner surface of the clutch chamber 135 of the pulley 130, the heat radiation holes 191 formed on the trajectory of the brake pad 210 are directed to the front of the pulley 130. It is open and closed by the brake pad 210 in the clutch chamber 135 (see FIG. 3).

In addition, the heat dissipation groove 192 is to increase the heat dissipation area of the pulley 130, and the trajectory of the brake pad 210 on the surface opposite to the surface on which the brake pad 210 of the pulley 130 is mounted. Along the circumferential direction).

Here, the heat dissipation grooves 192 is formed as a half moon shape opened in the front direction of the pulley 130 along the direction toward the center (C) of the through hole 131, disposed between the heat dissipation holes 191 do.

Therefore, in the present embodiment, as the heat dissipation holes 191 and the heat dissipation grooves 192 are formed as the heat dissipation means 190 in the pulley 130, the clutch disc 220 and the brake pad 210 are generated. The frictional heat can be easily released through the pulley (130).

That is, in the present embodiment, since the heat dissipation holes 191 and the heat dissipation grooves 192 are opened to the opposite side of the surface on which the brake pad 210 of the pulley 130 is mounted, friction heat through the pulley 130 is formed. The amount of heat dissipation can be maximized, and the frictional heat radiated through the heat dissipation holes 191 and the heat dissipation grooves 192 can be cooled while directly contacting the outside air.

Thus, in this embodiment, since the frictional heat generated by the frictional force between the clutch disk 220 and the brake pad 210 can be actively radiated through the pulley 130, the pulley 130 and the clutch disk 220 between Since the friction force is not reduced, slip between the pulley 130 and the clutch disc 220 can be prevented, and power transmission efficiency through the clutch disc 220 can be improved.

In addition, in the present embodiment, since the heat dissipation holes 191 are opened to the front of the pulley 130 and closed by the brake pad 210 in the clutch chamber 135, foreign matters through the heat dissipation holes 191. It is possible to block the flow between the brake pad 210 and the clutch disk 220.

6 is a plan view showing a modification of the pulley applied to the water pump for a vehicle according to an exemplary embodiment of the present invention.

Referring to the drawings, the pulley 330, which is applied to an exemplary embodiment of the present invention, is a modified example, in which the heat dissipation holes 391 are directed toward the center C of the through hole 331 (shown in the drawing). May be arranged in a lattice form along the circumferential direction.

That is, the heat radiating holes 391 may be arranged in a zigzag shape along the circumferential direction on the trajectory of the brake pad.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

Since these drawings are for reference in describing exemplary embodiments of the present invention, the technical idea of the present invention should not be construed as being limited to the accompanying drawings.

1 is an exploded perspective view showing the configuration of a water pump for a vehicle according to an exemplary embodiment of the present invention.

2 is a cross-sectional view of the combined configuration of FIG.

3 is a cross-sectional view for explaining the operation of the vehicle water pump according to an exemplary embodiment of the present invention.

4 is a perspective view illustrating a pulley applied to a vehicle water pump according to an exemplary embodiment of the present invention.

5 is a plan view of FIG. 4.

6 is a plan view showing a modification of the pulley applied to the water pump for a vehicle according to an exemplary embodiment of the present invention.

Claims (6)

A pulley having a through hole formed at a center thereof and a clutch chamber formed at a rear surface of the through hole along a circumference of the through hole; A brake pad mounted to an inner surface of the clutch chamber of the pulley; A clutch disk selectively mounted to the brake pad in the clutch chamber of the pulley; A hub coupled to the through hole of the pulley via a pulley bearing and interconnected with the clutch disc through a plurality of spring pins mounted at an outer circumferential end thereof; A return spring mounted on the spring pin between the clutch disk and the hub and exerting a spring force on the clutch disk; A field coil installed inside the clutch chamber of the pulley by being wrapped with a coil case and a cover corresponding to the rear surface of the clutch disk; And It is rotatably installed in the pump body through the pump bearing, one end is connected to the center of the hub, the other end is connected to the impeller with the sealing unit is interposed with the main shaft Including; And the pulley forms at least one heat dissipation hole on a trajectory of the brake pad. The method according to claim 1, The heat sink, A water pump for a vehicle is formed spaced apart from each other as a pair along the direction toward the center of the through hole, spaced apart from each other along the circumferential direction of the pulley and continuously arranged. The method according to claim 1, The heat sink, A water pump for a vehicle arranged in a grid form along the circumferential direction of the pulley on the trajectory of the brake pad. A pulley having a through hole formed at a center thereof and a clutch chamber formed at a rear surface of the through hole along a circumference of the through hole; A brake pad mounted to an inner surface of the clutch chamber of the pulley; A clutch disk selectively mounted to the brake pad in the clutch chamber of the pulley; A hub coupled to the through hole of the pulley via a pulley bearing and interconnected with the clutch disc through a plurality of spring pins mounted at an outer circumferential end thereof; A return spring mounted on the spring pin between the clutch disk and the hub and exerting a spring force on the clutch disk; A field coil installed inside the clutch chamber of the pulley by being wrapped with a coil case and a cover corresponding to the rear surface of the clutch disk; And It is rotatably installed in the pump body through the pump bearing, one end is connected to the center of the hub, the other end is connected to the impeller with the sealing unit is interposed with the main shaft Including; The pulley is a water pump for a vehicle to form heat dissipation grooves in the form of slots spaced apart at regular intervals along the trajectory of the brake pad on the surface opposite to the surface on which the brake pad is mounted. 5. The method of claim 4, The heat dissipation groove is a vehicle water pump is formed as a half moon shape along the direction toward the center of the through hole. 5. The method of claim 4, The pulley forms at least one heat dissipation hole on the trajectory of the brake pad, And a heat dissipation hole and the heat dissipation groove intersected along the circumferential direction on the trajectory of the brake pad.

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