KR20110063109A - Water pump for vehicle - Google Patents

Abstract

PURPOSE: A water pump for a vehicle is provided to selectively pump cooling water since a clutch electronically operates according to the operation condition of an engine, the temperature condition of cooling water and the will of a driver so that the power of a pulley is transferred or blocked to/from an impeller. CONSTITUTION: A water pump(100) for a vehicle comprises a pulley(130), a brake pad(210), a clutch disc(220), a hub(230), a return spring(240), a field coil(260) and a main shaft(270). The pulley comprises a through hole and a clutch chamber. The clutch chamber is formed on the rear along the circumferential surface of the through hole. The clutch disc is arranged in the clutch chamber of the pulley to face the brake pad. A plurality of plates(225,226,227) of the clutch disc are overlapped and fixed. The hub is coupled to the through hole of the pulley 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, and ii) an inner surface of the clutch chamber of the pulley. A brake pad mounted to the brake pad, iii) a clutch disk disposed corresponding to the brake pad in the clutch chamber of the pulley, and iii) a plurality of couplings coupled to the through-holes of the pulley through a pulley bearing and mounted at an outer circumferential end thereof. A hub interconnected with the clutch disc via a spring pin, iii) a return spring mounted between the clutch disc and the hub and exerting a resilience force to the clutch disc, and iii) a clutch chamber of the pulley. A field coil installed inside the coil case and a cover in correspondence to the rear surface of the clutch disk, and pumped to the pump body. It is rotatably installed through a bearing, one end is connected to the center of the hub, the other end includes a main shaft connected to the impeller with the sealing unit interposed, the clutch disk is a plurality of disk plates And overlap each other and are substantially fixed.

In the vehicle water pump, the clutch disk includes a first disk plate, a second disk plate fixed to one side of the first disk plate corresponding to the brake pad, and the first disk corresponding to the coil case. It may comprise a third disk plate which is fixed to the other side of the plate.

In the vehicle water pump, the first and second disc plates may be made of a high hardness steel material, and the third disc plate may be made of a low hardness steel material.

In the vehicle water pump, the clutch disk may be combined as any one of the first, second and third disk plates selected from among welding, riveting, caulking, and press-fitting methods.

In the vehicle water pump, the field coil generates a magnetic force by an external control signal, magnetizes the coil case as the magnetic force, and controls the connection between the clutch disk and the brake pad.

In the vehicle water pump, the clutch disk may be connected to the brake pad in a state where the coil case is not magnetized to transmit power of the pulley to the impeller.

In the vehicle water pump, the clutch disk may be separated from the brake pad according to the magnetization of the coil case to idle the pulley.

The vehicle water pump may form a mounting groove for mounting the brake pad on an inner surface of the clutch chamber of the pulley.

In the vehicle water pump, the hub has a first mounting hole in which the spring pin is mounted at an outer circumferential end thereof, and the clutch disk has a second spring pin in the inner circumferential end corresponding to the first mounting hole. Mounting holes may be formed.

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 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, as the clutch disk is configured as a multi-plate clutch composed of a plurality of disk plates, an effect of improving overall rigidity and repeatability while securing flexibility (restoration characteristics) 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 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 as the pulley 130 rotates and pumps 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 in a ring shape having a predetermined width, and is mounted on the rear surface of the pulley 130, and is bonded and bonded to the mounting groove 137 of the inner surface of the clutch chamber 135.

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 divided into a predetermined section 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 is a seal of the pump body 110 Sealing unit for 273 is connected to the impeller 150 has been mentioned in the state interposed.

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

Thus, when the power of the engine is provided to the pulley 130 through the belt, since the clutch disc 220 is in close contact with the brake pad 210 in a state connected to the hub 230 through the spring pin 231, 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 has the main shaft 270. It rotates by) 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, such as 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 to be 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.

Meanwhile, in the clutch disk 220 applied to the vehicle water pump 100 according to the exemplary embodiment of the present invention, as shown in FIGS. 4 and 5, the plurality of disk plates 225, 226, and 227 overlap each other. It is fixed and configured.

Specifically, the disk plates 225, 226, and 227 may include a first disk plate 225 and a second disk plate fixed to one side of the first disk plate 225 corresponding to the brake pad 210. 226 and a third disk plate 227 fixed to the other side of the first disk plate 225 in correspondence with the coil case 261.

Here, the first and second disk plates 225 and 226 are made of steel material having high hardness, and the third disk plate 227 is made of steel material having relatively low hardness.

In this case, the disk plates 225, 226, 227 may be formed by overlapping with each other, or may be joined by welding or riveting, or may be coupled by interference fit such as caulking or pressing.

The reason why the clutch disc 220 is configured as the plurality of disc plates 225, 226, and 227 is that when the clutch disc 220 is a single plate, the front of the clutch disc 220 should move uniformly when the clutch disc 220 moves. Since one side is deformed, the contact with the brake pad 210 becomes incomplete, and thus an abnormality occurs in power transmission.

 In other words, the clutch disc 220 is preferably rigid in a predetermined space, and advantageously should be a ferromagnetic material. If the ferromagnetic is excessive, the clutch disk 220 is vulnerable to fatigue due to the properties of the material. .

Therefore, in the present embodiment, since the plurality of disk plates 225, 226, and 227 have multiple clutch disks 220 overlapping and coupled to each other, the maximum rigidity can be secured while reducing the cross-sectional area. As the first disk plate 225 is formed of a material of high hardness, the restoring property can be enhanced.

In addition, in the present embodiment, since a plurality of disk plates 225, 226, and 227 are provided with the overlapping clutch disk 220, flexibility is secured to each end plate, and the clutch disc 220 is interlocked with each end plate. The overall stiffness of) can be improved.

In addition, the clutch disc 220 according to the present embodiment forms the first and second disc plates 225 and 226 corresponding to the brake pad 210 by using a high hardness steel material. It is possible to increase the wear and magnetic force responsiveness.

In addition, the clutch disk 220 according to the present embodiment is formed of a low hardness steel material in consideration of the stationary contact with the coil case 261, the third disk plate 227 corresponding to the field coil 260, By reducing the impact on the coil case 261, it is possible to ensure the repeatability of the clutch.

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 showing a clutch disk applied to a water pump for a vehicle according to an exemplary embodiment of the present invention.

5 is a cross-sectional view of FIG. 4.

Claims (4)

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 disc disposed corresponding 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 clutch disk is a vehicle water pump is configured such that the plurality of disk plates overlap each other and substantially fixed. The method according to claim 1, The clutch disc A first disk plate; A second disk plate fixed to one side of the first disk plate corresponding to the brake pad; And A third disk plate fixed to the other side of the first disk plate corresponding to the coil case; Vehicle water pump comprising a. The method of claim 2, The first and second disk plates are made of a high hardness steel material, and the third disk plate is made of a low hardness steel material. The method of claim 2, The clutch disk, And said first, second and third disk plates are combined as any one selected from among welding, riveting, caulking and press-fitting.

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