Seal apparatus for a water pump, rotation-support apparatus for a water pump, and a water pump

Abstract

A structure of a water pump is provided without increasing the cost thereof, or without enlarging the size to improve the durability of the water pump. A seal apparatus is comprised of a seal ring 13 and a slinger 14 in combination to prevent foreign matter from progressing into the rolling bearing 6a. The amount of compression delta of the second seal lip 23, which occurs when the tip edge of the second seal lip 23 of the seal ring 13 comes in contact with the outer peripheral surface of the outer-diameter-side cylindrical section 26 that is formed at the outer peripheral edge of the slinger 14, is at least 1 / 10 and up to 7 / 10 the height of the second seal lip 23 in the free state. In addition, the roughness of a portion of the outer peripheral surface of the outer-diameter-side cylindrical section 26 which the tip edge of the second seal lip 23 comes in sliding contact with is from 0.2 mum to 2.0 mum in the arithmetic mean Ra, or is from 0.8 mum to 8.0 mum in the maximum height Ry.

Description

[0001] This invention relates to a seal apparatus for a water pump and a rotation-support apparatus for a water pump and a water pump, and more particularly to improvement of the seal apparatus of a water pump that is used for circulating coolant water for an automobile engine.BACKGROUND TECHNOLOGY[0002] A water pump used for circulating coolant water for an automobile engine has been disclosed in Japanese Patent Publication No. Toku Kai Hei 8-254213, and is constructed as shown in FIG. 6. A cylindrical housing 1 has an installation flange 2 formed around its outer peripheral surface on the axial inside end (the inside with reference to the axial direction is the side nearest the engine, and is the right side in all of the figures) and fastened to the cylinder block of the engine by way of the installation flange 2. Provided on the radial inside of the housing 1 is a rolling-bearing unit 6 which comprises a ball bearing 4 on the axial inside end and a roller bearing 5 on the axial o...

AI Technical Summary

Benefits of technology

This patent is about a seal apparatus for a water pump used in automobiles. The invention aims to improve the seal performance and prevent foreign matter such as steam or hot water from leaking into the pump. The invention includes a seal apparatus with a mechanical seal and a slinger, which work together to improve seal performance. The seal apparatus also includes a supply-discharge hole for discharging any steam or hot water that may leak out. The invention also includes a construction with a concentric outer-diameter-side cylindrical section and an inclined seal lip that comes in sliding contact with the outer-diameter-side cylindrical section. This helps to efficiently throw foreign matter away from the seal apparatus.

Problems solved by technology

However, with the aforementioned mechanical seal 10, obtaining a perfect seal is difficult, and when friction heat is generated on the seal surface of this mechanical seal 10, the coolant water, which contains chemical matter such as an anti-freeze agent or anti-rust agent, evaporates and becomes steam and leaks out toward the rolling-bearing unit 6, while at the same time, the coolant water in which the aforementioned chemical matter is condensed due to evaporation of the coolant water and also leaks out to the rolling-bearing unit 6.

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