JP2564843Y2 - Sliding thrust bearing structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding thrust bearing structure, and more particularly to a sliding thrust bearing structure which is excellent in wear resistance and can extend the life without specifying a material.

[0002]

2. Description of the Related Art There is known a sliding thrust bearing structure including a curved shaft end and a receiving member having a contact load surface which comes into contact with the shaft end to receive the load.

[0003] As an example, a stainless steel shaft has a spherical surface with R1 to R10 and a surface roughness of 2S or less formed at the shaft end, and the receiving member is made of a polyacetal resin (for example, trade name "Delrin") having wear resistance. A contact load surface having a mirror finish with a surface roughness of 2S or less is formed on the contact load surface, and a lubricant such as oil or grease is applied to the contact load surface.
A bearing such as a vertical-type small motor that supports an axial load of up to 5 kgf is configured.

[0004]

However, since a high surface pressure is generated between the curved end of the shaft and the contact load surface of the receiving member due to the axial force, the lubricant is discharged from the contact portion. To be in a lubricated state. In the case of wearable materials, problems such as an increase in load loss due to friction and abnormal progress of wear are caused, so the choice of resin materials is limited, and excessive cost burden due to expensive wear resistant resin is avoided. I couldn't do that.

[0005]

According to the present invention, there is provided a thrust bearing structure comprising a shaft having a curved shaft end and a receiving member having a load plane for receiving the shaft end. The unevenness in the range of 5 μm to 50 μm for storing lubricant is integrally formed on the load plane, and the lubricant is filled between the shaft end and the load plane to load the lubricant. The thrust bearing structure was formed by rotating the shaft end while sliding it.

[0006]

[Action] On the load plane of the receiving member on which the thrust load acts
The integrally formed unevenness in the range of 5 μm to 50 μm makes it possible to store the lubricant supplied between the shaft end and the abutting shaft end, and the lubrication of the abutting portion is ensured with the valley depth of the unevenness being a wear limit. You.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a detailed view of a main part of a sliding thrust bearing according to first to fourth embodiments of the present invention.

FIG. 1A is a longitudinal sectional view of a sliding thrust bearing according to a first embodiment. The sliding thrust bearing includes a shaft end 1a which forms a curved surface of the shaft 1 and a receiving member 2 which forms a load plane 2a on which a thrust force is applied by contact of the shaft end 1a.

On the load plane 2a of the receiving member 2, irregularities 3 having a surface roughness of about 5 to 50S are formed. This unevenness 3
Thereby, the lubricant 4 can be supplied between the shaft end 1a and the abutting shaft end 1a.

FIGS. 1B and 1F are enlarged plan views of essential parts according to the second and third embodiments , respectively, and FIGS. 1C and 1G are longitudinal sectional views thereof. The load plane 2a of the receiving member 2 has a lattice shape, a vortex shape,
Alternatively , concavities and convexities 5 , 7 formed of concentric arc-shaped grooves are respectively formed. The groove has a depth of approximately 5 to 50 μm, and its cross-sectional shape is V-shaped, U-shaped, rectangular, trapezoidal, bow-shaped, and the like can be applied.

[0012]

The operation of the slide thrust bearing structure configured as described above will be described below.

FIGS. 2A and 2B are explanatory views of the operation according to the embodiment of the present invention. FIGS.
Each state when wear progresses is shown.

The shaft end 1a, which forms the curved surface of the shaft 1 in FIG. 1A, comes into contact with the top of the unevenness 3 formed on the load plane 2a of the receiving member 2. Therefore, the lubricant 4 penetrates into the gap formed by the unevenness 3, and the contact portion between the shaft end 1a and the load plane 2a is sufficiently lubricated from the beginning of use, thereby minimizing wear and load loss.

In the case where the wear progresses from the initial state in FIG. 1A, as long as a part of the unevenness 3 facing the shaft end 1a remains, the contact portion is divided by the unevenness 3 and has a size. Is restricted within the irregularities 3, the lubricant 4 enters through the gaps between the irregularities 3 and the contact portion is sufficiently lubricated.

Therefore, the wear is suppressed for a long time without being influenced by the material of the receiving member until the unevenness 3 reaches the wear progressing state shown in FIG. 3C through the partial wear state shown in FIG. And the load loss is kept to a minimum.

FIG. 3 is an operation explanatory view according to the prior art.
(A), (b) and (c) show the state of small wear and the state of progress of wear at the beginning of use in comparison with the present invention.

The shaft end 1a which forms the curved surface of the shaft 1 in FIG.
Abuts against the load plane 2b of the receiving member 2 which has been smoothed. At this time, near the center of the contact portion, the lubricant 4 is discharged by the contact pressure, and non-lubricated sliding is performed.

The wear proceeds due to the non-lubricated sliding, and the contact portion rapidly expands the contact area through a small wear state shown in FIG. In the vicinity of the center of the contact portion, penetration of the lubricant 4 becomes difficult, and a large load loss occurs, and the wear region expands at an accelerated pace and soon reaches the large wear state shown in FIG.

FIG. 4 is a wear characteristic diagram showing the amount of wear in the thrust direction with respect to the operation time of the bearing. The test conditions were as follows: at room temperature, a thrust load of 0.1 to 5 kgf, grease lubrication,
000 rpm, and a forward / reverse switching interval of 30 seconds.

As shown in a characteristic diagram C1, the measurement result of the wear amount of the bearing structure according to the present invention is reduced to approximately one-fifth to one-sixth of the characteristic diagram C2 according to the prior art. (Specifically, when T1 = 250 hours, A1
= 10 to 25 µm, A2 = 50 to 150 µm).

As described above, the load flat surface of the resin receiving member on which the thrust force is applied by contacting the shaft end finished to the curved surface,
By forming irregularities that enable the supply of lubricant,
The lubrication is ensured regardless of the progress of wear, so that wear is minimized over a long period. Therefore,
The load loss is kept small without being restricted by the resin material, and a long life is achieved.

A specific application example of the slide thrust bearing structure having the above characteristics will be described below.

FIG. 5 is a vertical sectional view of a vertical motor to which the present invention is applied. The upper end side shaft end 1a of the shaft 1 , which is a rotating shaft made of stainless steel, forms a sliding thrust bearing structure formed in contact with a load plane 2a of a receiving member 2 made of resin. The shaft end 1a is finished to a spherical surface, and the load plane 2a of the receiving member 2 is formed.
Is formed with the above-mentioned unevenness that enables the lubricant to be supplied between the shaft end 1a and the shaft end 1a.

The receiving member 2 supports the coil 12 via the base 11 on the stator side . The coil 12 is provided to face the magnet 13 on the rotor side . 14, 15 is the base
A radial bearing supports the shaft 1 rotatably above and below the shaft 11 .

[0027] The coil 12 receives the suction force with receiving the rotational driving force between the magnet 13, the suction force
The load obtained by subtracting the load on the rotor side from the above acts as the thrust load of the sliding thrust bearing structure. At this time, since the lubricant is supplied via the unevenness formed on the load plane 2a of the receiving member 2, lubrication is ensured for a long period of time with the valley depth of the unevenness being a wear limit, and the load loss is minimized. Is maintained at a minimum.

[0028]

[Effects of the Invention] As described above, according to the present invention,
A thrust bearing structure comprising a shaft having a curved shaft end and a receiving member having a load plane for receiving the shaft end, wherein the load plane has a range of 5 μm to 50 μm for storing lubricant. The unevenness is formed integrally, a lubricant is filled between the shaft end and the load plane, and the shaft end is rotated while sliding the shaft end on the load plane to form a thrust bearing structure.
Since the unevenness in the range of 5 μm to 50 μm is integrally formed on the load plane of the receiving member on which the thrust load acts, it becomes possible to store the lubricant supplied with the valley depth of the unevenness as a wear limit. Load losses can be kept to a minimum over a long period of time up to the limit.

Therefore, the receiving member is not limited to an expensive wear-resistant material, and a low-cost and long-life sliding thrust bearing can be obtained.

[Brief description of the drawings]

FIG. 1 is a detailed view of a main part of a sliding thrust bearing structure according to first to fourth embodiments of the present invention.

FIG. 2 is an operation explanatory view according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram of an operation according to a conventional technique.

FIG. 4 is a wear characteristic diagram showing a wear amount in a thrust direction with respect to a bearing operation time.

FIG. 5 is a vertical sectional view of a vertical motor to which the sliding thrust bearing structure according to the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... shaft, 1a ... shaft end, 2 ... receiving member, 2a ... load plane,
3, 5, 7: unevenness , 4: lubricant.

Claims (1)

(57) [Scope of request for utility model registration] 1. A thrust bearing structure comprising: a shaft having a curved shaft end; and a receiving member having a load plane for receiving the shaft end, wherein the thrust bearing structure is configured to store lubricant in the load plane. 5 μm to 5
A thrust bearing, wherein unevenness in a range up to 0 μm is integrally formed, the lubricant is filled between the shaft end and the load plane, and the shaft end is rotated while sliding on the load plane. Construction.