KR19990020976A - Water Pumps for Automotive Engines - Google Patents

Abstract

The present invention relates to a water pump for an automobile engine installed in the front of the cylinder block to pump the coolant to the coolant inlet communicating with the water jacket. The present invention consists of a pump body (10), a pump shaft (20) penetrating the pump body (10), the rotating plate (32) and the blades (34), leakage between the pump body (10) and the pump shaft (20) An impeller 30 fixed to one end of the pump shaft 20 so that a seal 14 is formed, a pulley 40 for transmitting the rotational force of the crankshaft to the pump shaft 20, and rotation of the impeller 30. In a water pump for an automobile engine composed of a mechanical seal (50) fitted to the pump shaft (20) so as to prevent leakage of coolant to the pump shaft (20), the coolant at the time of rotation of the impeller (30) is stagnant. It is characterized in that a plurality of pressure holes 32a arranged in a circumferential shape are formed in the rotating plate 32 of the impeller 30 so as to relieve the pressure formed in the leak chamber 14. According to the present invention having such a configuration, by forming a pressure hole in the rotating plate of the impeller, the stagnant coolant is circulated to absorb heat generated from the mechanical seal, and the coolant pressure in the leak chamber is eliminated to reduce the amount of leakage. Therefore, the reliability of the product is improved.

Description

Water Pumps for Automotive Engines

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump for an automobile engine, and more particularly, to a water pump for an automobile engine installed at a front surface of a cylinder block to pump cooling water into a cooling water inlet communicating with a water jacket.

In general, a vehicle is composed of a chassis and a body, the chassis is composed of an engine, a suspension, a steering device, a power transmission device, etc., the body not only forms the exterior of the vehicle but also supports each part of the chassis. do.

The engine obtains energy by compressing and burning fuel sucked into the engine as a part for generating power to drive an automobile. Such an engine is mainly composed of a cylinder, a cylinder head, a crankcase, a piston and a connecting rod, a crankshaft, a flywheel, and a valve device, a lubrication device, a cooling device, and an ignition device.

On the other hand, the cooling device is a device for cooling the engine during operation to maintain the engine temperature properly. Such a cooling device is to circulate the cooling water in the water jacket formed in the cylinder block and the cylinder head to perform the cooling action, including a water jacket formed in the cylinder block and the cylinder head, and a radiator, a water pump, a cooling fan, and a water temperature. It consists of regulators.

Referring to the operation of the cooling device having such a configuration as follows. First, the coolant circulated by the water pump passes through the water jacket formed on the cylinder block and the cylinder head, absorbs the heat of combustion generated inside the cylinder, and feeds it to the radiator. The coolant is cooled through heat exchange with the air flowing from the front of the vehicle while passing through the radiator core. On the other hand, the rear of the radiator is provided with a cooling fan to assist the ventilation of the radiator, the water jacket is installed at the outlet of the water jacket to open and close the passage of the cooling water according to the water temperature to adjust the temperature of the cooling water accordingly.

On the other hand, the water pump is installed on one side of the cylinder block (1) and driven by the crankshaft, with reference to Figure 1 looks at the configuration of the water pump in detail. According to this, the pump shaft 10 is installed in the cooling water inlet and the discharge body 12 is formed in the upper, lower portion so that the pump shaft 20 is penetrated. The pump shaft 20 is rotatably supported by the unit bearing 22, and the impeller 30 is fixed at one end thereof, and at the other end, the pulley receives the rotational force of the crankshaft (not shown) by the timing belt 42 ( 40) is fixed. On the other hand, the impeller 30 is composed of a plurality of vanes 34 arranged in a circumferential shape with the rotating plate 32, the leakage chamber (漏 泄 室: 14) between the pump body 10 and the pump shaft 20 It is press-fitted to the pump shaft 20 to be formed. In addition, a mechanical seal 50 is provided in the leak chamber 14 of the pump shaft 20 to prevent the coolant from leaking to the pump shaft 20 when the impeller 30 rotates at a high speed. Is fitted in. Mechanical seal 50 is composed of a rotary ring 52, a fixed ring 54 in contact with the rotary ring 52 and a spring 56 for holding the fixed ring 54 on the rotary ring 52. The mechanical seal 50 is rotated when the pump shaft 20 rotates the rotary ring 52 with the pump shaft 20 and the fixing ring 54 is in close contact with the rotary ring 52 by the spring 56. This is to prevent leakage of coolant.

In the water pump having such a configuration, when the engine operates to rotate the crankshaft, the rotational force is transmitted to the pulley 40 by the timing belt 42 and the pump shaft 20 is rotated. In addition, the impeller 30 linked with the pump shaft 20 is also rotated at the same time to suck the cooling water cooled in the radiator to be pumped to the water jacket of the cylinder block or cylinder head. On the other hand, the coolant is always stagnant in the leak chamber 14, and when the pressure of the outlet coolant increases during the pumping of the coolant, the pressure of the coolant in the leak chamber 14 also increases, which causes the coolant to have a mechanical seal ( It leaks through the sealing surface of 50), ie between the rotary ring 52 and the fixed ring 54. At this time, the leakage coolant is in a steam state due to the friction between the rotary ring 52 and the fixed ring 54, the steam is discharged to the outlet 12 of the upper portion and the cooling water not vaporized to the outlet 12 is formed in the lower portion It is discharged.

However, such a conventional water pump for an automobile engine has a relatively high water pressure at the outlet side when the impeller rotates at a high speed, so that the pressure of the coolant in the leakage chamber is also increased in the aftermath, thereby rotating the mechanical seal. The amount of leakage increases between the ring and the stationary ring, thereby increasing the amount of cooling water leaking into the outlet, resulting in unclean surroundings of the outlet, thereby lowering trust in the product.

Accordingly, the present invention has been made to solve the above problems, the object is to relieve the pressure in the leak chamber to reduce the amount of cooling water leakage around the outlet is clean and thus for the automotive engine for improving the reliability of the product In providing a water pump.

1 is a side sectional view showing a configuration of a water pump for a conventional automobile engine;

2 is a side sectional view showing a configuration of a water pump for an automobile engine according to the present invention.

Explanation of symbols for main parts of the drawings

10: pump body 12: outlet

14: leak chamber 20: pump shaft

22: unit bearing 30: impeller

32: rotating plate 32a: pressure ball

34: wing 40: pulley

50: mechanical seal 52: rotary ring

54: retaining ring 56: spring

In order to achieve the above object, the present invention includes a pump body, a pump shaft penetrating the pump body, an impeller fixed to one end of the pump shaft so that a leakage chamber is formed between the pump body and the pump shaft, and a rotating force of the crank shaft. A water pump for an automobile engine comprising a pulley for transmitting the pump shaft to a pump shaft and a mechanical seal fitted to the pump shaft to prevent leakage of coolant to the pump shaft when the impeller rotates, the leakage chamber in which the coolant is stagnant when the impeller rotates. The pressure plate is characterized in that a plurality of pressure holes arranged in the circumferential shape is formed on the rotating plate of the impeller.

Best Mode for Carrying Out the Invention Preferred embodiments of a water pump for an automobile engine according to the present invention will be described in detail below with reference to the accompanying drawings.

2 is a view showing the configuration of a water pump for an automobile engine according to the present invention. According to this, the water pump is installed in the cooling water inlet of the cylinder block (1) and the pump shaft 20 is installed in the pump body 10, the outlet 12 is formed in the upper, lower portion so as to penetrate. The pump shaft 20 is rotatably supported by the unit bearing 22, and the impeller 30 is fixed at one end thereof, and at the other end, the pulley 40 which receives the rotational force of the crankshaft by the timing belt 42 is fixed. . On the other hand, the impeller 30 is composed of a plurality of vanes 34 arranged in a circumferential shape with the rotating plate 32, the pump so that the leakage chamber 14 is formed between the pump body 10 and the pump shaft 20 It is press-fitted to the shaft 20. The rotating plate 32 is formed with a plurality of pressure holes 32a so as to release the pressure formed in the leak chamber 14 in which the coolant is stagnant when the impeller 30 rotates. In addition, a mechanical seal 50 is fitted to the pump shaft 20 to prevent leakage of the coolant to the pump shaft 20 when the impeller 30 rotates at a high speed in the leak chamber 14 of the pump shaft 20. . Mechanical seal 50 is composed of a rotary ring 52, a fixed ring 54 in contact with the rotary ring 52 and a spring 56 for holding the fixed ring 54 on the rotary ring 52. The mechanical seal 50 is rotated when the pump shaft 20 rotates the rotary ring 52 with the pump shaft 20 and the fixing ring 54 is in close contact with the rotary ring 52 by the spring 56. This is to prevent leakage of coolant.

In the water pump having such a configuration, when the engine operates to rotate the crankshaft, the rotational force is transmitted to the pulley 40 by the timing belt 42 and the pump shaft 20 is rotated. In addition, the impeller 30 linked with the pump shaft 20 is also rotated at the same time to suck the cooling water cooled in the radiator to be pumped to the water jacket of the cylinder block or cylinder head. In addition, the coolant is always stagnant in the leak chamber 14, and when the pressure of the outlet coolant increases during the pumping of the coolant, the pressure of the coolant in the leak chamber 14 also increases, which causes the coolant to have a mechanical seal ( It leaks through the sealing surface of 50), ie between the rotary ring 52 and the fixed ring 54. At this time, the leakage coolant is in a steam state due to the friction between the rotary ring 52 and the fixed ring 54, the steam is discharged to the outlet 12 of the upper portion and the cooling water not vaporized to the outlet 12 is formed in the lower portion It is discharged. On the other hand, when the vehicle is driving at high speed, the impeller 30 also rotates at high speed. Accordingly, the pressure of the cooling water at the outlet side is higher than the pressure of the cooling water at the inlet side. As a result, the pressure of the cooling water in the leakage chamber 14 is increased. At this time, the coolant in the leak chamber 14 is discharged to the inlet side through the pressure hole 32a formed in the rotating plate 32 of the impeller 30, and the pressure in the leak chamber 14 is naturally released.

As described above, the water pump for an automobile engine according to the present invention forms a pressure hole in the rotating plate of the impeller, thereby circulating the coolant that is stagnant to absorb the heat generated by the mechanical seal, and also to increase the coolant pressure in the leak chamber. It is eliminated to reduce the amount of leakage, thereby improving the reliability of the product.

Claims (1)

The pump body 10, the pump shaft 20 penetrating the pump body 10, the rotating plate 32 and the blade 34 is composed of a leak chamber 14 between the pump body 10 and the pump shaft 20. Impeller 30 is fixed to one end of the pump shaft 20, the pulley 40 for transmitting the rotational force of the crank shaft to the pump shaft 20, and the pump shaft 20 during the rotation of the impeller 30) In the water pump for an automobile engine composed of a mechanical seal (50) fitted to the pump shaft (20) so as to prevent the leakage of cooling water to the A plurality of pressure holes 32a circumferentially arranged in the rotating plate 32 of the impeller 30 so as to relieve the pressure formed in the leak chamber 14 in which the coolant is stagnant when the impeller 30 rotates. The water pump for automobile engines characterized by the above-mentioned.