JPS60237222A - Bearing - Google Patents

Abstract

PURPOSE:To reduce the frictional resistance to improve the durability and eliminate generation of rotational sounds by forming a spiral groove only one end of which is opened, to a bearing end surface inversely to the rotating direction of the shaft. CONSTITUTION:A spiral groove 10 formed on an inner peripheral surface 12 of an oil containing bearing 11 is opened on an end surface 14 of one end of the bearing 11, and the turning direction of the groove 13 is made inverse to the rotating direction of the bearing 11, thus moving aged oil contents and the like to discharge the same out of the opened end. Accordingly, when the bearing 11 rotates in the direction shown by an arrow A with respect to a shaft 15, the contact portion of the bearing 11 and the shaft 15 moves from a point (c) to (d), and the relationship between the groove 13 and junctions (a) and (b) of the contact parts (c) and (d) is so set that the junction (b) is not set frontwardly of the junction (a) in the rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to bearings for household electrical appliances and appliances used in general households and the like.

Structure of conventional example and its problems Oil-impregnated bearings as shown in Figs. 1 and 2 have been known for some time, and this bearing (1) has linear grooves (
2). (3) is a shaft supported by bearing (1). In oil-impregnated bearings, the inner peripheral surface, which is the sliding part of the shaft, wears out over time, and the oil impregnated in the bearing constantly lubricates the sliding surface. Therefore, the mixture of oil and worn parts accumulates in the linear grooves and is not discharged, but also adheres to the sliding surfaces. This highly viscous mixture increases rotational torque and becomes rotational resistance. Also, basically the shaft (3) and the bearing (
The sliding surface with 1) is a straight line, and in the case where conventional linear grooves are provided, the sliding part is discontinuous at the groove, so there is a problem that rotational noise is generated at this discontinuous part.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and improves durability by maintaining the sliding surfaces between the bearing and the shaft in the best possible lubrication state and maintaining low frictional resistance. The purpose is to eliminate rotational noise.

Structure of the Invention In order to achieve the above object, the bearing of the present invention has a spiral groove formed in the inner circumferential surface of the oil-impregnated bearing that supports the shaft in a direction opposite to the direction of rotation of the bearing or the shaft. is one in which only one end is open at the bearing end face.

DESCRIPTION OF EMBODIMENTS The following is an explanation of an embodiment of the present invention based on the drawings (Figs. 3 to 5).
The explanation will be based on Figure).

As an example, a case where the bearing rotates will be described. (11) is an oil-impregnated bearing, and its sliding inner peripheral surface (12)
A spiral groove (13) is formed in the groove. This groove (13)
is open at one end face (14) of the bearing (11),
A groove (13) communicates with the end face (14). Also, the winding direction (rightward in the example) of the spiral groove (13) is aligned with the bearing (
11) so that aged oil and the like are moved in the groove (13) and discharged from the open end. Therefore, if the bearing (11) rotates in the direction of the arrow in FIG. 4 (counterclockwise) with respect to the shaft (15), the bearing (11)
The contact portion between the shaft (15) and the shaft (15) moves from FIG. 4 (a) to (b). Therefore, the relationship between the intersections (a) and (b) of the groove (13) and the contact parts (a) and (b) is such that (b) is not in the forward direction of rotation than (a) [in the example, (b) is The groove (13) is set closer to the open end of the groove (13) than in (a).

For example, as shown in Figure 5, a clothes dryer fan (16)
As seen in the fan metal (17), the round belt (18
) rotates the fan (16), which generates moist hot air (2) that exchanges heat with the damp clothes in the drum (19).
0) into the fan case (21) and discharged to the outside of the fan case (21). Therefore, fan metal (17
) is exposed to a high temperature and humidity atmosphere and rotates.

Therefore, by preventing the aforementioned spiral groove from being opened on the end face of the fan metal (17) on the drum (19) side, it is possible to prevent water, dust, etc. from entering the sliding surface of the fan metal (17). Can be done. By the way, in the oil-impregnated fan metal (17), the mixture with wear powder and aged oil produced by rotation has a high viscosity, so if it is allowed to remain on the sliding surface, the rotation will decrease due to the viscosity and the fan's air blowing capacity will decrease. ,
It also reduces the drying performance of clothes dryers. Therefore, as described above, the spiral groove (22) is provided in the opposite direction to the rotation direction of the fan metal (17), and the groove (22) is formed in the direction opposite to the rotation direction of the fan metal (17).
) side, the aging oil and abrasion powder are constantly moved along the groove (22) from point (,) to point (b) shown in Figure 4 above. Since force acts in the direction of movement and is discharged from the open end, the sliding part can maintain a stable state at all times, ensuring stable rotation.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained. In other words, the oil contained in the oil-impregnated bearing and the abrasion powder are mixed by heating and sliding due to the frictional heat of the sliding surface.
A mixture of wear powder and aged oil is produced, and this mixture has a high viscosity and reduces rotation. However, by providing the spiral groove so that only the rearmost end is open on one end face of the bearing as in the present invention, the above mixture can be reduced. It becomes possible to discharge from the sliding surface,
In addition, since the groove is not open at the other end of the bearing, entry of foreign matter can be prevented. As a result of the above, the sliding surface of the oil-impregnated bearing can continue to maintain its initial state, and the durability of the oil-impregnated bearing in a stable state can be significantly extended. Furthermore, by providing a spiral groove,
Since the contact between the grooves on the contact surface between the shaft and the bearing is at a point, there is no discontinuity that occurs in the case of conventional linear grooves on the sliding surface, which prevents rotational noise and improves practicality. It is extremely large.

[Brief explanation of drawings]

Figures 1 and 2 show a conventional example, where Figure 1 is a perspective view of the bearing, Figure 2 is a front sectional view showing the relationship between the bearing and the shaft, and Figure 3 is a front sectional view showing the relationship between the bearing and the shaft.
5 to 5 show an embodiment of the present invention, FIG. 3 is a perspective view of the bearing, FIG. 4 is a side sectional view showing the relationship between the bearing and the shaft,
FIG. 5 is an enlarged cross-sectional view of a main part when the oil-impregnated bearing according to the embodiment of the present invention is used in a clothes dryer. (11)...Bearing, (12)...Inner peripheral surface, (13)
... Groove, (14) ... End face, (15) ... Shaft, (
17)...Fan metal, (22)...Mizo agent
Yoshihiro Morimoto Figure 7 1 Figure 3 1 t Figure 4 1

Claims (1)

[Claims] 1. A bearing in which a spiral groove is formed in the inner peripheral surface of the oil-impregnated bearing that supports the shaft in the opposite direction to the direction of rotation of the bearing or the shaft, and this groove has only one end open at the end face of the bearing. .