JPH04116297A - Cooling water pump fitting structure for engine - Google Patents

Abstract

PURPOSE:To improve the durability of seals by arranging multiple seals between a case and a pump shaft at a gap, and forming the opening section of a drain passage communicated to the outside of the case in this gap. CONSTITUTION:A seal 13 is located on the inside of a seal 12, and its inner periphery 13a is liquid-tightly provided on a pump shaft 7 via a pair of O-rings 17. A cooling water seal section 13c and an oil seal section 13d are formed on the inner periphery 13a, the outer periphery 13b is liquid-tightly provided on the clip 16 of the seal 12 via a clip 18, thereby the outer periphery 12a is liquid-tightly provided on a recess 3b indirectly. An opening section 19 is formed on the outer periphery 12a and clip 16 of the seal 12, it is communicated to a drain passage 20 formed on a case 3, and a gap 14 between the seal 12 and seal 13 is communicated to the outside of the case 3.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cooling water pump mounting structure for an engine of a vehicle, etc., and specifically relates to a cooling water pump mounting structure for an engine having a seal between cooling water and oil. be.

[Prior Art] A cooling water pump is used in a water-cooled engine of a vehicle, and the cooling water pump is driven to circulate cooling water between the engine and a radiator to cool the engine. .

Some cooling water pumps have a pump shaft provided with an impeller rotatably supported in a case forming a pump chamber. In this type of engine cooling water pump mounting structure, a cooling water seal and an oil seal are provided between the case and the pump shaft to seal the cooling water and oil so that the cooling water flows to the lubricating side of the pump shaft. This prevents oil from leaking into the pump chamber.

[Problems to be Solved by the Invention] For example, if cooling water leaks from between the cooling water seal and the pump shaft and collects between the cooling water seal and the oil seal, the pump shaft will rust and the cooling water will be damaged. Members such as clips and O-rings that support water seals and oil seals are easily damaged, and seal failures are likely to occur.

The present invention has been made in view of the above, and an object of the present invention is to provide an engine cooling water pump mounting structure that has a simple structure and can improve the durability of the seal.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides an engine cooling water pump mounting structure in which a pump shaft provided with an impeller is rotatably supported in a case forming a pump chamber. The present invention is characterized in that a plurality of seals are arranged with gaps between the case and the pump shaft, and a frontage of a drainage passage communicating with the outside of the case is formed in the gaps.

[Function] In this invention, a plurality of seals are arranged with gaps between the case forming the pump chamber and the pump shaft, and the cooling water leaking from the cooling water seals is drained from the frontage of this gap. The water is discharged to the outside of the case via the water drain passage.

Therefore, the cooling water captured from the cooling water seals does not accumulate in the gaps between the seals, and damage to parts such as clips and O-rings that support the seals due to rust on the pump shaft is reduced, increasing the durability of the seals. will improve.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

The figure is a sectional view of an engine cooling water pump to which the present invention is applied.

In the drawings, reference numeral 1 denotes an engine case, and a case 3 forming a pump chamber 2 is attached to the engine case 1. A pump cover 4 is attached to this case 3,
A pump chamber 2 is defined between the case 3 and the pump cover 4. Cooling water flows into the pump cover 4 from a radiator (not shown) through a passage 5, and a cooling water passage (not shown) is formed in the pump chamber 2, and a cooling water pump 6 drives the cooling water to the water jacket of the engine. It is designed to be pumped to

An impeller 8 is provided on a pump shaft 7 of this cooling water pump 6, and this pump shaft 7 is attached to a bearing portion 1a of the engine case 1.
and a bearing portion 3a of the case 3 so as to be rotatable. A drive gear 9 is press-fitted into the pump shaft 7, and is further positioned with a ring 10 and a clip 11, so that the pump shaft 7
It can be rotated as one unit. This drive gear 9 meshes with a gear provided on a crankshaft (not shown), and power from the crankshaft is introduced through the drive gear 9 to rotate the pump shaft 7, and oil is supplied to the pump shaft side for lubrication. Supplied.

The case 3 forming the pump chamber 2 is formed with four parts 3b, and a seal 12 and a seal 13 are arranged with a gap 14 between the recess 3b of the case 3 and the pump shaft 7. . The seal 12 is located on the pump chamber side, and its inner periphery 12a is liquid-tightly provided on the pump shaft 7 with an O-ring 15. A cooling water seal portion 12c is formed on this inner periphery 12a, and its outer periphery is 12b is liquid-tightly provided in the recess 3b by a clip 16.

The seal 13 is located inside this seal 12, and its inner circumference 13a is liquid-tightly provided on the pump shaft 7 with a pair of O-rings 17.
c and an oil seal portion 13d are formed, and the outer peripheral portion 1
3b is the clip 16 of the seal 12 by the clip 18.
The outer peripheral portion 13b is provided in a liquid-tight manner in the recessed portion 3b.
indirectly and liquid-tightly provided.

A frontage portion 19 is formed in the outer peripheral portion 12a of the seal 12 and the clip 16, and a water drainage passage 20 formed in the case 3 is formed.
The gap 14 between the seal 12 and the seal 13
is communicated with the outside of case 3.

Note that the outer circumferential portion 13b of the seal 13 may be provided directly in the recess 3b in a liquid-tight manner. In this case, the gap 14 between the seal 12 and the seal 13 is provided in the drain passage 20 formed in the case 3. Can be communicated directly.

Therefore, if cooling water were to leak from the cooling water seal portion 12C of the seal 12 and enter the gap 14, this leaked cooling water would flow from the opening 19 of the gap 14 to the water drain passage 20.
It is discharged to the outside of the case 3 via.

In this way, the cooling water does not accumulate in the gap 14 and flows outside.
Cooling water seal portion 12c of seal 12
Rust on the pump shaft 7 due to leaking cooling water is reduced. Furthermore, due to this rust, the clip 1 supporting the seal 12
6 and the O-ring 17 that supports the seal 13, etc., are less likely to be damaged, and the durability of the seal is improved.

[Effects of the Invention] As explained above, in the present invention, a plurality of seals are arranged with a gap between the case forming the pump chamber and the pump shaft, and the gap communicates with the outside of the case. Since the opening of the water drain passage is formed, the cooling water leaking from the seal can be discharged from the opening of the gap to the outside of the case via the water drain passage.

Therefore, cooling water leaking from the seals does not accumulate between the seals, and damage to members such as clips and rings that support the seals due to rust on the pump shaft is reduced, improving the durability of the seals.

[Brief explanation of drawings]

The figure is a sectional view of an engine cooling water pump to which the present invention is applied. In the figure, 1 is the engine case, 2 is the pump chamber, 3 is the case, 4 is the pump cover, 6 is the cooling water pump N7 is the pump shaft, 12.13 is the seal, 14 is the gap, 19 is the frontage, 20 is the This is a drainage passage.

Claims (1)

[Claims] In an engine cooling water pump mounting structure in which a pump shaft provided with an impeller is rotatably supported in a case forming a pump chamber, a plurality of seals are arranged with gaps between the case and the pump shaft, An engine cooling water pump mounting structure characterized in that a frontage portion of a water drain passage communicating with the outside of the case is formed in this gap.