JPS60172725A - Device for preventing splash of bearing lubricant - Google Patents

Abstract

PURPOSE:To eliminate the need of making labyrinth groove in a housing body by disposing a ring-like labyrinth member in the ring-like space formed between a bearing and the housing body. CONSTITUTION:A housing body 25 such as a motor case is disposed adjacently to a bearing 14. A ring-like space is formed between the bearing 14 and the housing body 25 and a ring-like labyrinth member 26 is disposed in said space. The labyrinth member 26 has a labyrinth groove 26a formed thereon and is determined to have an inner diameter as to permit formation of a spacing toward the shaft 1.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a bearing lubricant scattering prevention device.

(Prior Art) In bearing devices, particularly rolling gully bearing devices, a lubricant such as grease or oil is used to lubricate the bearing. When this type of bearing device is used in an extremely high-speed rotating mechanism, there is a risk that the lubricant will scatter around the bearing device and contaminate other equipment members. Therefore, conventionally, a labyrinth groove is provided in the housing body of the bearing, and this labyrinth function prevents the lubricant from leaking and scattering to the outside of the housing body. However, this method requires troublesome machining of the labyrinth groove, complicates the structure of the housing body, and has the disadvantage of increasing cost.

(Objective) An object of the present invention is to provide an inexpensive lubricant scattering prevention device that does not require machining of labyrinth grooves in a housing body.

(Structure) The structure of the present invention will be explained below based on the illustrated embodiment.

FIG. 1 shows a sectional view of a brushless motor to which the present invention can be applied, and the configuration of the motor will be explained in advance. In the figure, numeral 1 is the shaft of the motor, 2 is the driven body, BOLOTISF, and 3 is the disc holder.
4 is the mounting flange, 5 is the motor case which is the housing body, 6 is the magnet rotor, 7 is the stator, 8
indicates each coil.

Also, reference numeral 9 is a lid flange, 1 is a speed detection magnet, 12 is a pole element for rotor position detection, and 13 is a
1 and 2 respectively show lead wires drawn out from the bottom side of the motor.

The motor shaft 1 constructed as described above has a rolling bearing 14 interposed between it and the motor case 5, and a lid flange 9.
It is rotatably supported by a rolling gully bearing 15 interposed between.

Here, we will focus on the upper rolling bearing 14, from which lubricant is scattered. In particular, the motor is used in, for example, a semiconductor laser printer, and the rotational speed of the motor reaches around 4,500 rpm, so it is necessary to take sufficient measures to prevent lubricant from scattering.

Therefore, as shown in Fig. 2, labyrinth grooves 1, 6, and 17 are provided in the receiving flange 4 and the motor case 5, respectively, and this structure prevents the lubricant from leaking and scattering outside the motor. It is. If such a configuration is not provided, other equipment members such as the holodisk 2 will be contaminated with the lubricant. In addition, even when polygons are used in addition to the photos, the polygons are similarly contaminated.

However, in the conventional example in which a labyrinth groove is provided in such a motor case, etc., the labyrinth groove must be machined on the mounting flange 4 and the motor case 5 itself, which complicates the structure and makes it difficult to operate the motor. The disadvantage is that processing costs increase.

Therefore, in the present invention, as shown in FIG. 3, a ring-shaped space is formed adjacent to the bearing 14 and between a housing body 25 such as a motor case, and a ring-shaped space is formed in this space. A labyrinth member 2G was provided.

A labyrinth groove 26α having a shape as shown in the figure is formed in the labyrinth member 26, and the labyrinth member 26 is made of metal or synthetic resin, and a gap is formed between the labyrinth member 26 and the shaft 1. Its inner diameter is determined so that According to this configuration, there is no need to take the trouble of machining a labyrinth groove in the mounting flange 4 or the motor case 5 (see Figure 1), and it is sufficient to simply insert the labyrinth part 26, simplifying the structure of the motor case, etc. It also contributes to reducing the cost of the motor. Note that, as in the embodiment shown in FIG. 4, a method may be adopted in which the labyrinth member 26 is press-fitted into the outer ring 24α on the stationary side of the bearing 24.

(Effects) As described above, the present invention can provide a less expensive lubricant scattering prevention device that does not require machining of labyrinth grooves in the bearing housing body.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a brushless motor to which the present invention can be applied, FIG. 2 is a sectional view of a conventional labyrinth component, FIG. FIG. 7 is a sectional view of a main part of another example device. l ・Shaft, 14.24 Bearing, 25...Housing body,
26- Labyrinth part, 26α Labyrinth groove.

Claims (1)

[Claims] A ring-shaped case 4977, which is adjacent to the bearing installed between the housing body and the shaft, has a ring-shaped space formed between the bearing and the housing body, and has a labyrinth groove formed in this space. A bearing lubricant scattering prevention device characterized by having a member interposed therein.