JP2005086942A - Bearing part waterproofing structure of vertical motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing part waterproofing structure for a vertical motor that incorporates a semi-permanent sealing structure by non-contact sealing of a labyrinth structure, that extends maintenance cycles by abolishing consumable components, that is light, and that can be miniaturized. <P>SOLUTION: A structure of a bearing part for the vertical motor has: a shaft for the vertical motor; a bearing cover that stores the bearing; a bearing holder that is mounted on the outside circumferential surface of the shaft to hold the bearing; and a bearing bracket that holds the outside circumferential surface and that is provided with the bearing cover. In this structure of the bearing portion, a part of the bearing cover close to the bearing holder is made into the labyrinth structure, and a part of the bearing holder close to the bearing cover is also made into the labyrinth structure. Furthermore, a drain groove is provided on upper surface portion of the axial direction of the bearing bracket so as to be positioned below the labyrinth portion of the bearing cover. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bearing waterproof structure employed in a vertically mounted motor.

A conventional bearing waterproof structure of a vertical motor is performed by using a contact-type seal between a bearing bracket and a shaft (see, for example, Patent Document 1). Some use non-contact type seals.
Hereinafter, the first prior art will be described with reference to FIG. 3, and the second prior art will be described with reference to FIG.
[First prior art]
In FIG. 3, a bearing cover 11 that surrounds the end face of the bearing 1 is attached to one end face of a bearing bracket 10 that rotatably supports the shaft 2 via the bearing 1 and a cylindrical bearing housing 4 at the center thereof. A contact seal 12 is attached to the tip of the central portion. A part of the contact-type seal 12 is in contact with the outer peripheral surface of the shaft 2, and the contact portion between the contact-type seal 12 and the shaft 2 slides to prevent outflow of grease and oil that lubricates the bearing 1. In addition, it prevents the inflow of liquids and solids from the outside.
[Second prior art]
In FIG. 4, a bearing bracket 10 that rotatably supports a shaft 2 via a bearing 1 and a cylindrical bearing housing 4 at the center thereof are attached to a bearing cover 5 that surrounds the end surface of the bearing 1. A bearing retainer 6 that holds the bearing 1 is attached to the outer peripheral surface 2. By forming a non-contact seal with a labyrinth structure at the part where the bearing cover 5 and the bearing retainer 6 are close to each other, the grease and oil that lubricates the bearing 1 are prevented from flowing out, and liquid and solids flow from the outside. Is preventing.
JP-A-5-161297

However, such a conventional vertical motor bearing portion waterproof structure has the following problems.
・ There is loss due to friction of the sliding part of the contact type seal, and there is a decrease in sealing performance due to wear, wear and deterioration of the sliding part, and it is necessary to replace the contact type seal periodically.
・ Since the sealing performance of the contact-type seal deteriorates due to wear, wear and deterioration of the sliding part, liquid or solid flows from the outside.
・ Non-contact type seals with a labyrinth structure may cause liquid to flow in if a liquid volume exceeding the allowable level is applied.
・ In order to increase the allowable amount of non-contact type seals with a labyrinth structure, the labyrinth structure becomes large and complicated, which obstructs the weight and size reduction of the vertical motor.
The present invention has been made to solve such a problem, and has a semi-permanent seal structure using a non-contact type seal with a labyrinth structure, and a maintenance cycle is extended by eliminating consumable parts, thereby reducing weight and size. It is an object of the present invention to provide a waterproof structure for a vertical motor bearing.

  In order to solve the above problems, the present invention provides a shaft of a vertical motor, a bearing that supports the shaft, a bearing cover that houses the bearing, and a bearing that is attached to the outer peripheral surface of the shaft and holds the bearing. In a bearing portion structure of a vertical motor that includes a presser and a bearing bracket that holds the outer peripheral surface of the bearing and is provided with the bearing cover, a portion of the bearing cover that is close to the bearing presser has a labyrinth structure. In addition, the portion of the bearing retainer that is close to the bearing cover has a labyrinth structure, and a drainage groove is provided on the upper surface of the bearing bracket in the axial direction so as to be lower than the labyrinth portion of the bearing cover. Is.

  According to the bearing structure waterproof structure of the vertical motor of the present invention, the liquid applied to the upper bearing bracket and the upper surface of the bearing portion of the vertical motor is drained to the motor outer peripheral side through the drainage groove on the upper surface of the bearing bracket. Inflow of liquid due to the type seal can be prevented, and the vertical motor can be reduced in size and weight by a simple labyrinth structure.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing a waterproof structure of a bearing portion of a vertical motor in a first embodiment of the present invention.
In FIG. 1, a bearing cover 5 that rotatably supports a shaft 2 via a bearing 1 and a cylindrical bearing housing 4 at the center of the bearing bracket 3 are attached to a bearing cover 5 that surrounds the end surface of the bearing 1. A bearing retainer 6 that holds the bearing 1 is attached to the outer peripheral surface 2. A labyrinth structure is provided in a portion of the bearing cover 5 that is in close proximity to the bearing retainer 6 and a labyrinth structure is provided in a portion of the bearing retainer 6 that is in close proximity to the bearing cover 5 to form a non-contact seal. This prevents the grease and oil that are lubricating the bearing 1 from flowing out, and also prevents the inflow of liquid and solid from the outside.
A drainage groove is provided on the upper surface of the bearing bracket 3 in the axial direction so as to be lower than the labyrinth portion of the bearing cover 5, and the bearing bracket 5 does not stagnate the liquid blocked by the labyrinth portion of the bearing cover 5. It can be led to the outer periphery and drained to the motor outer periphery.

FIG. 2 is a view corresponding to FIG. 1 showing the configuration of the second embodiment.
In FIG. 2, a bearing cover 5 that surrounds the end face of the bearing 1 is attached to one end face of a bearing bracket 3 that rotatably supports the shaft 7 via the bearing 1 and a cylindrical bearing housing 4 at the center thereof. 7 is provided with a bearing pressing portion 8 for holding the bearing 1. A labyrinth structure is provided in a portion of the bearing cover 5 that is in close proximity to the bearing holding portion 8, and a labyrinth structure is provided in a portion of the bearing holding portion 8 that is in close proximity to and opposed to the bearing cover 5. This prevents the outflow of grease and oil that lubricates the bearing 1, and prevents the inflow of liquid and solid from the outside.
Further, a drainage groove 9 is provided on the upper surface of the bearing bracket 3 in the axial direction so as to be lower than the labyrinth portion of the bearing cover 5, so that the liquid dammed up by the labyrinth portion of the bearing cover 5 is not stagnated. It can be led to the bracket outer periphery and drained to the motor outer periphery.

It is a sectional side view which shows the bearing part waterproof structure of the vertical motor in 1st Example of this invention. FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment of the present invention. It is a sectional side view which shows the bearing part waterproof structure of the vertical motor in 1st prior art. FIG. 4 is a view corresponding to FIG.

Explanation of symbols

1 Bearing 2, 7 Shaft 3, 10 Bearing bracket 4 Bearing housing 5 Bearing cover 6, 11 Bearing retainer 8 Bearing retainer 9 Drain groove 12 Contact seal

Claims (1)

A shaft of a vertical motor, a bearing that supports the shaft, a bearing cover that houses the bearing, a bearing holder that is attached to the outer peripheral surface of the shaft, holds the bearing, and holds the outer peripheral surface of the bearing And a bearing part structure of a vertical motor provided with a bearing bracket provided with the bearing cover,
The portion of the bearing cover adjacent to the bearing retainer has a labyrinth structure, and the portion of the bearing retainer adjacent to the bearing cover has a labyrinth structure,
Furthermore, the bearing portion waterproofing structure for a vertical motor, characterized in that a drainage groove is provided on the upper surface portion in the axial direction of the bearing bracket so as to be lower than the labyrinth portion of the bearing cover.

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