JPH04132220U - Angular ball bearing - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the life of a lubricant-filled bearing, and to prevent heat generation and an increase in the time required for break-in. [Structure] A part of the inner ring 1 on the side opposite to the direction in which the contact angle θ is formed is omitted to narrow the inner ring width, and a spacer 5 is provided in the omitted part of the inner ring. A lubricant reservoir space 6 is provided within this spacer 5, and a through hole 7 is provided that opens from the lubricant reservoir space 6 toward the rolling elements 3. When the inner ring 1 rotates, the centrifugal force causes the grease in the lubricant reservoir space 6 and its base oil to be replenished little by little into the bearing from the through hole 7.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is related to angular contact ball bearings, which use a lubricating method that seals in a lubricant such as grease. It is something to do.

0002

[Conventional technology]

Bearings used for high-speed rotating shafts such as the main spindle of machine tools are becoming more and more expensive as the speed increases. Oil lubrication, oil mist lubrication, jet lubrication, etc. are used. but, All of these lubrication methods use pumps, etc. to inject lubricating oil. Therefore, due to the complexity of the lubrication system, it is recommended to use grease lubrication, which is easy to maintain. Strong demand.

0003 With grease lubrication, inside the bearing, that is, between each part such as rolling elements, inner and outer rings, cage, etc. Use by filling the gap with grease.

0004

[Problem that the idea aims to solve]

In this case, each part is lubricated by a small amount of grease held between the parts, but the Since the amount of grease is small, the life of the grease is shortened, and therefore the life of the bearings is shortened. There is a problem.

[0005] Although it is possible to increase the amount of grease sealed to some extent, If it is sealed between each of the above parts, heat generation due to the stirring resistance of the grease will increase. Moreover, it takes time to drain excess grease and run-in to improve blending. The problem is that it becomes long. Especially when used in machine tools, bearings Since the heat generated in the process affects machining accuracy, it is necessary to reduce it as much as possible.

[0006] The purpose of this invention is to improve bearing life, reduce heat generation and break-in time. It is an object of the present invention to provide a lubricant-filled angular contact ball bearing that can prevent the increase in lubricant.

[0007]

[Means to solve the problem]

The angular contact ball bearing of this invention has a rolling element load on the opposite side of the contact angle formation direction of the inner ring. The inner ring width is narrowed by omitting the non-active part, and a lubricant reservoir space and a lubricant reservoir space are created in the omitted part of the inner ring. A spacer is provided that has a through hole that opens from the space between the wheels toward the rolling path of the rolling element. It is something that

[0008]

[Effect]

According to this configuration, the amount of lubricant held between the inner and outer rings inside the bearing is kept small, and It is used by sealing lubricant in the lubricant reservoir space of the seat. During use, the rotation of the inner ring Due to the centrifugal force that accompanies rotation, the lubricant and its components in the lubricant reservoir space are gradually released into the through-hole. It is supplied to the vicinity of the rolling elements.

[0009]

【Example】

An embodiment of this invention will be described based on FIGS. 1 and 2. This angular ball The bearing is composed of an inner ring 1, an outer ring 2, spherical rolling elements 3, a cage 4, and a spacer 5. Ru. The inner ring 1 has a portion on the opposite side to the direction in which the contact angle θ is formed, that is, a portion shown by a chain line in FIG. The width dimension is narrowed by omitting the part 1a, and the spacer 5 is installed in the inner ring omitted part 1a. Placed.

0010 Angular contact ball bearings are rolling bearings that have a non-zero contact angle θ and cannot self-align. The omitted portion 1a of the inner ring 1 is a portion on which the rolling element load does not substantially act. this In the embodiment, the rolling groove width B left in the inner ring 1 is equal to the rolling groove width B in the inner ring in the non-omitted state. The inner ring width is designed to be at least 1/2 of the width A, but this dimension does not reach the bottom of the rolling groove. (1/2A in FIG. 2).

[0011] The spacer 5 forms a lubricant reservoir space 6 consisting of a circumferential groove on its inner diameter surface, and Through holes 7 that open from the space 6 toward the rolling path of the rolling elements 3 are provided at multiple locations in the circumferential direction. (for example, 4 locations). A chamfered portion is provided at the corner of the spacer 5 facing the rolling element 3. 8 is provided, and the through hole 7 opens into the chamfered portion 8. The lubricant reservoir space 6 has a groove bottom. The through hole 7 is formed in a semicircular shape and opens from a portion near the deepest part of the groove bottom. Through hole 7 The inner diameter is designed to be, for example, 1 mm or less in diameter.

0012 The inner ring 1 and spacer 5 are fixed to a rotating shaft 9, and the outer ring 2 is a housing that is a stationary member. (not shown), etc. When assembling the bearing, there is a gap between the inner and outer rings inside the bearing. Grease, which is a lubricant, is filled in, but in a smaller amount than is normally filled, and the lubricant is The lubricant is filled in the lubricant reservoir space 6 as much as possible.

[0013] The lubricant sealed in the lubricant reservoir space 6 may be a general semi-solid or solid grease. In addition to leases, we also use woven fabrics and felts impregnated with liquid grease, oleoresin, and lubricating oil. etc. can be used.

[0014] According to this configuration, the centrifugal force accompanying the rotation of the inner ring 1 seals the lubricant reservoir space 6. A small amount of the injected lubricant or its liquid components enters the vicinity of the rolling elements inside the bearing from the through hole 7. It is replenished in quantity. If the lubricant is a semi-solid grease, the grease The base oil is supplied separately from the thickener. In this way, the lubrication inside the lubricant reservoir space 6 Since the lubricant is replenished in small amounts, the lubrication life of the bearing is improved. Also, because of this bearing The amount of lubricant sealed inside can be reduced, and heat generation due to stirring resistance of the lubricant can be reduced. This can reduce the amount of time required for running-in and reduce the time required for break-in.

[0015] In this embodiment, the lubricant reservoir space 6 has a semicircular groove bottom, and is located at the deepest part of the groove bottom. Since the through hole 7 is opened in a nearby location, the lubricant in the lubricant reservoir space 6 and its Components tend to gather at the entrance of the through hole 7 due to centrifugal force, leaving almost no residue at the entrance of the through hole 7. supplied to

[0016] Although the lubricant reservoir space 6 is formed in the spacer 5, the lubricant reservoir space 6 is formed directly in the inner ring 1. Processing is easier than in the case of forming a space. Also, the lubricant reservoir is empty in the retainer 4. Compared to the case where a gap is formed, the capacity of the lubricant reservoir space 6 can be formed larger. Even if there is a weight imbalance in the lubricant remaining in the lubricant reservoir space 6, there will be no problem. never occurs.

[0017] Note that a lubricant reservoir is formed from the outer diameter surface on the end surface and inner diameter surface of the spacer 5 that contact the inner ring 1. It is preferable to provide a ventilation path penetrating the space 6. Create a ventilation path like this This prevents the interior of the lubricant reservoir space 6 from becoming negative pressure as the lubricant flows out. This prevents the lubricant from flowing out due to negative pressure.

[0018] In the above embodiment, the spacer 5 was formed to match the width of the outer ring 2, but the width of the spacer 5 Laws can be designed arbitrarily. For example, as shown in FIG. 3, the spacer 5 is formed wide and double-row The spacer 5 may be shared by both angular ball bearings 10 and 11. Furthermore, in each of these embodiments, the shape of the lubricant reservoir space 6 is not limited to the circumferential groove; The spacer 5 may be divided into multiple parts in the circumferential direction, and the spacer 5 may have an opening at the end face. It may also be formed with a concave portion. Furthermore, the through hole 7 is a groove formed in the end surface of the spacer 5. It's okay.

[0019]

[Effect of the idea]

According to the angular contact ball bearing of this invention, lubricant is applied to the spacer provided in the omitted part of the inner ring. Because a reservoir space and through holes are provided, the lubricant reservoir is created by the centrifugal force caused by the rotation of the inner ring. The lubricant and its components in the space are replenished little by little from the through holes to the vicinity of the rolling elements. Therefore, the lubrication life of the bearing is extended, and the amount of lubricant inside the bearing is kept small. This has the effect of reducing heat generation and shortening the time required for break-in.

[Brief explanation of drawings]

FIG. 1 is a half-cut sectional view of an embodiment of this invention.

FIG. 2 is a partially omitted cross-sectional view.

FIG. 3 is a partial cross-sectional view of another embodiment of the invention.

[Explanation of symbols]

1... Inner ring, 2... Outer ring, 3... Rolling element, 4... Cage, 5... Spacer, 6... Lubricant reservoir space, 7... Through hole, 9... Rotating shaft, θ
…contact angle

Claims (1)

[Scope of utility model registration request] [Claim 1] The width of the inner ring is narrowed by omitting the part of the inner ring on the side opposite to the contact angle formation direction where no rolling element load is applied, and a spacer is provided in the omitted part of the inner ring, and a lubricant reservoir space is provided in the spacer. An angular contact ball bearing having a through hole that opens from the lubricant reservoir space toward the rolling path of the rolling elements.